DE102024101135A1 - INJECTION MOLDING MACHINE CONNECTION BOX, INJECTION MOLDING MACHINE WIRING STRUCTURE AND INJECTION MOLDING MACHINE - Google Patents

Abstract

A technique is provided for preventing water droplets from entering a terminal box (620) from an opening (621) of the terminal box (620). A terminal box (620) of an injection molding machine (10) accommodates a terminal block (610) to which one end of a first wire (601) is detachably mounted. The terminal box (620) includes a wall (641) provided to partition an inverted conical rotary body (B) of which an axis of rotation is a straight line (A) extending directly upward from a center of an opening (621) for the first wire (601) and an apex angle is 120°.

Description

BACKGROUND OF THE INVENTION

Field of the invention

The present invention relates to a terminal box of an injection molding machine, a wiring structure of an injection molding machine, and an injection molding machine.

Description of the state of the art

A power supply cable of an electric heater for a heating cylinder disclosed in Japanese Unexamined Patent Publication No. 2015-107616 extends downward from a terminal box positioned in a transverse direction and then changes direction and extends in an axial direction of the heating cylinder.

SUMMARY OF THE INVENTION

A terminal box of an injection molding machine accommodates a terminal block that electrically connects a first wire and a second wire. The terminal box includes an opening for the first wire. Since the first wire enters and exits the opening, a connector is connected to the opening, or the like, water droplets are likely to enter the opening.

An aspect of the present invention provides a technique for inhibiting intrusion of water drops into a terminal box from an opening of the terminal box, adhesion of water drops to a terminal provided in the opening, and the like.

A terminal box of an injection molding machine according to an aspect of the present invention accommodates a terminal block to which one end of a first wire is detachably mounted. The terminal box includes a wall provided to partition an inverted conical rotary body of which a rotary axis is a straight line extending directly upward from a center of an opening for the first wire and an apex angle is 120°.

According to the aspect of the present invention, all paths of water droplets falling at an angle of 60° or less with respect to a vertical direction toward the center of the opening of the junction box can be blocked by the wall. Accordingly, entry of water droplets into the junction box from the opening of the junction box can be inhibited.

SHORT DESCRIPTION OF THE CHARACTERS

• 1 is a diagram showing a state of an injection molding machine according to an embodiment at a completion time of mold opening.
• 2 is a diagram showing a state of the injection molding machine according to the embodiment at a time of mold closing/clamping.
• 3 is a diagram showing an example of a wiring structure of the injection molding machine.
• 4 is a cross-sectional view of a junction box along line IV-IV of 3 .
• 5 is an exploded perspective view of the 3 shown junction box, which is disassembled into a box-shaped section and a cover part.
• 6 is an unfolded view of the 5 shown box-shaped section.
• 7 is a diagram showing a modification example of the junction box.
• 8A is a diagram showing a first example of junction box openings, 8B is a diagram showing a second example of the junction box openings, and 8C is a diagram showing a third example of the junction box openings.

DETAILED DESCRIPTION OF THE INVENTION

Embodiments of the present invention will be described below with reference to the drawings. The same or corresponding components are denoted by the same reference numerals in the respective drawings, and the description thereof will be omitted.

(Injection molding machine)

1 is a diagram showing a state of an injection molding machine according to an embodiment at a completion time of mold opening. 2 is a diagram showing a state of the injection molding machine according to the embodiment at a time of mold clamping. In this description, an X-axis direction, a Y-axis direction, and a Z-axis direction are mutually perpendicular directions. The X-axis direction and the Y-axis direction indicate horizontal directions, and the Z-axes direction indicates a vertical direction. In a case where a mold closing/clamping unit 100 is of a horizontal type, the X-axis direction is a mold opening/closing direction, and the Y-axis direction is a width direction of an injection molding machine 10. A negative side in the Y-axis direction is called an operating side, and a positive side in the Y-axis direction is called a counter operating side.

As in 1 and 2 As shown, the injection molding machine 10 includes a mold closing/clamping unit 100 that opens and closes a mold unit 800, an ejector unit 200 that ejects molded products molded by the mold unit 800, an injection unit 300 that injects a molding material into the mold unit 800, a moving unit 400 that causes the injection unit 300 to move back and forth with respect to the mold unit 800, a controller 700 that controls the respective components of the injection molding machine 10, and a frame 900 that supports the respective components of the injection molding machine 10. The frame 900 includes a mold closing/clamping unit frame 910 that supports the mold closing/clamping unit 100 and an injection unit frame 920 that supports the injection unit 300. The mold closing/clamping unit frame 910 and the injection unit frame 920 are each installed on a floor 2 via height adjusters 930. The control device 700 is arranged in an interior of the injection unit frame 920. The respective components of the injection molding machine 10 are described below.

(Mold closing/clamping unit)

In describing the mold closing/clamping unit 100, a moving direction of a movable platen 120 in a case where a mold is to be closed (for example, a positive X-axis direction) corresponds to a front side, and a moving direction of the movable platen 120 in a case where the mold is to be opened (for example, a negative X-axis direction) corresponds to a back side.

The mold closing/clamping unit 100 performs mold closing, pressurization, mold closing/clamping, pressure release, and mold opening of the mold unit 800. The mold unit 800 includes a stationary mold 810 and a movable mold 820.

For example, the mold closing/clamping unit 100 is of a horizontal type, and the mold opening/closing direction of the mold closing/clamping unit 100 is a horizontal direction. The mold closing/clamping unit 100 includes a stationary platen 110 to which the stationary mold 810 is attached, the movable platen 120 to which the movable mold 820 is attached, and a moving mechanism 102 that moves the movable platen 120 with respect to the stationary platen 110 in the mold opening/closing direction.

The stationary platen 110 is fixed to the mold clamping unit frame 910. The stationary mold 810 is fixed to a surface of the stationary platen 110 that faces the movable platen 120.

The movable platen 120 is arranged to be movable with respect to the mold closing/clamping unit frame 910 in the mold opening/closing direction. Guides 101 that guide the movable platen 120 are laid on the mold closing/clamping unit frame 910. The movable mold 820 is attached to a surface of the movable platen 120 that faces the stationary platen 110.

The moving mechanism 102 causes the movable platen 120 to move back and forth with respect to the stationary platen 110 to perform mold closing, pressurization, mold closing/clamping, pressure release, and mold opening of the molding unit 800. The moving mechanism 102 includes a toggle beam 130 arranged with a distance between the stationary platen 110 and itself, columns 140 connecting the stationary platen 110 to the toggle beam 130, a toggle mechanism 150 that moves the movable platen 120 with respect to the toggle beam 130 in the mold opening/closing direction, a mold closing/clamping motor 160 that operates the toggle mechanism 150, a motion converting mechanism 170 that converts a rotational motion of the mold closing/clamping motor 160 into a linear motion, and a mold space adjusting mechanism 180 that adjusts a distance between the stationary platen 110 and the toggle beam 130.

The toggle beam 130 is arranged with a gap between the stationary platen 110 and itself, and is placed on the mold closing/clamping unit frame 910 so as to be movable in the mold opening/closing direction. The toggle beam 130 may be arranged so as to be movable along guides laid on the mold closing/clamping unit frame 910. The guides for the toggle beam 130 may be common to the guides 101 for the movable platen 120.

In the present embodiment, the stationary plate 110 is fixed to the mold closing/clamping unit frame 910, and the toggle bracket 130 is arranged to be the mold closing/clamping unit frame 910 is movable in the mold opening/closing direction. However, the toggle bracket 130 may be fixed to the mold closing/clamping unit frame 910, and the stationary platen 110 may be arranged to be movable with respect to the mold closing/clamping unit frame 910 in the mold opening/closing direction.

The columns 140 connect the stationary platen 110 to the toggle beam 130 with a distance L between the stationary platen 110 and the toggle beam 130 in the mold opening/closing direction. A plurality (for example, four) of the columns 140 may be used. The plurality of columns 140 are arranged parallel to the mold opening/closing direction and stretch depending on a mold closing/clamping force. At least one column 140 may be provided with a column strain detector 141 that measures a strain of the column 140. The column strain detector 141 sends a signal indicating a detection result thereof to the controller 700. The detection result of the column strain detector 141 may be used for measurement of a mold closing/clamping force and the like.

The column strain detector 141 is used as a mold clamping force detector for measuring a mold clamping force in the present embodiment, but the present invention is not limited thereto. The mold clamping force detector is not limited to a type of strain gauge, and may be of a piezoelectric type, a capacitive type, a hydraulic type, an electromagnetic type, or the like. A position where the mold clamping force detector is mounted is also not limited to the column 140.

The toggle mechanism 150 is arranged between the movable platen 120 and the toggle beam 130, and moves the movable platen 120 with respect to the toggle beam 130 in the mold opening/closing direction. The toggle mechanism 150 includes a crosshead 151 that moves in the mold opening/closing direction, and a pair of link groups that are flexed and extended in response to the movement of the crosshead 151. Each of the pair of link groups includes a first link 152 and a second link 153 that are flexibly and extendably connected to each other by a pin or the like. The first link 152 is oscillatively attached to the movable platen 120 by a pin or the like. The second link 153 is oscillatively attached to the toggle beam 130 by a pin or the like. The second link 153 is attached to the crosshead 151 via a third link 154. In a case where the crosshead 151 is caused to move back and forth with respect to the toggle bracket 130, the first and second links 152 and 153 are flexed and extended, and the movable plate 120 moves back and forth with respect to the toggle bracket 130.

The configuration of the toggle mechanism 150 is not limited to the configuration shown in 1 and 2 shown. In 1 and 2 For example, the number of nodes of each link group is five, but may be four. An end portion of the third link 154 may be connected to the node between the first and second links 152 and 153.

The mold closing/clamping motor 160 is attached to the toggle beam 130 and operates the toggle mechanism 150. The mold closing/clamping motor 160 causes the crosshead 151 to move forward and backward with respect to the toggle beam 130 so that the first and second links 152 and 153 are flexed and extended to cause the movable platen 120 to move forward and backward with respect to the toggle beam 130. The mold closing/clamping motor 160 is directly connected to the motion conversion mechanism 170, but may be connected to the motion conversion mechanism 170 via a belt, pulleys, and the like.

The motion conversion mechanism 170 converts a rotary motion of the mold clamping motor 160 into a linear motion of the crosshead 151. The motion conversion mechanism 170 includes a spindle shaft and a spindle nut screwed to the spindle shaft. Balls or rollers may be interposed between the spindle shaft and the spindle nut.

The mold closing/clamping unit 100 performs a mold closing process, a pressurizing process, a mold closing/clamping process, a pressure releasing process, a mold opening process, and the like under the control of the controller 700.

In the mold clamping process, the mold clamping/clamping motor 160 is driven to cause the crosshead 151 to move forward at a set moving speed to a mold clamping completion position, so that the movable platen 120 is caused to move forward and the movable mold 820 is caused to contact the stationary mold 810. The The position and the moving speed of the crosshead 151 are measured using, for example, a mold clamping motor encoder 161 or the like. The mold clamping motor encoder 161 measures rotation of the mold clamping motor 160 and sends a signal indicating a detection result thereof to the controller 700.

A crosshead position detector for measuring the position of the crosshead 151 and a crosshead movement speed detector for measuring the movement speed of the crosshead 151 are not limited to the mold clamping/clamping motor encoder 161, and general detectors may be used. Further, a movable platen position detector for measuring the position of the movable platen 120 and a movable platen movement speed detector for measuring the movement speed of the movable platen 120 are not limited to the mold clamping/clamping motor encoder 161, and general detectors may be used.

In the pressurizing process, the mold closing/clamping motor 160 is further driven to cause the crosshead 151 to further advance from the mold closing completion position to a mold closing/clamping position and generate a mold closing/clamping force.

In the mold closing/clamping process, the mold closing/clamping motor 160 is driven to maintain the position of the crosshead 151 in the mold closing/clamping position. In the mold closing/clamping process, the mold closing/clamping force generated in the pressurizing process is maintained. In the mold closing/clamping process, cavity spaces 801 (see 2 ) is formed, and the injection unit 300 fills the cavity spaces 801 with liquid molding material. Molded products are obtained in a case where the molding material filling the cavity spaces is solidified.

One cavity space 801 may be provided, or a plurality of cavity spaces 801 may be provided. In the latter case, a plurality of molded products are obtained simultaneously. A feed material may be arranged in a part of each cavity space 801, and the other part of each cavity space 801 may be filled with a molding material. Molded products in which the feed material and the molding material are integrated with each other are obtained.

In the pressure release process, the mold clamping/clamping motor 160 is driven to cause the crosshead 151 to move backward from the mold clamping/clamping position to a mold opening start position so that the movable platen 120 is caused to move backward to reduce the mold clamping/clamping force. The mold opening start position and the mold clamping completion position may be the same position.

In the mold opening process, the mold clamping motor 160 is driven to cause the crosshead 151 to move backward at a set movement speed from the mold opening start position to a mold opening completion position, so that the movable platen 120 is caused to move backward and causes the movable mold 820 to be separated from the stationary mold 810. Thereafter, the ejector unit 200 ejects the molded products from the movable mold 820.

Setting conditions in the mold clamping process, the pressurizing process, and the mold clamping/clamping process are collectively set as a series of setting conditions. For example, moving speeds and positions (including a mold clamping start position, a moving speed switching position, a mold clamping completion position, and a mold clamping/clamping position) of the crosshead 151 and mold clamping/clamping forces in the mold clamping process and the pressurizing process are collectively set as a series of setting conditions. The mold clamping start position, the moving speed switching position, the mold clamping completion position, and the mold clamping/clamping position are arranged in this order from a back side to the front side, and indicate start points and end points of sections in which the moving speeds are set. The moving speed is set for each section. One moving speed switching position may be set, or multiple moving speed switching positions may be set. The moving speed switching position may not be set. It may be that only the mold closing/clamping position or the mold closing/clamping force is adjusted.

Setting conditions in the pressure release process and the mold opening process are also collectively set in the same way. For example, moving speeds and positions (including the mold opening start position, the moving speed switching position, and the mold opening completion position) of the crosshead 151 in the pressure release process are process and the mold opening process are collectively set as a set of setting conditions. The mold opening start position, the movement speed switching position, and the mold opening completion position are arranged in this order from a front side to the back side, and indicate start points and end points of sections in which the movement speeds are set. The movement speed is set for each section. One movement speed switching position may be set, or multiple movement speed switching positions may be set. The movement speed switching position may not be set. The mold opening start position and the mold closing completion position may be the same position. Further, the mold opening completion position and the mold closing start position may be the same position.

The moving speeds, positions, and the like of the movable platen 120 may be set instead of the moving speeds, positions, and the like of the crosshead 151. Further, a mold closing/clamping force may be set instead of the position (for example, the mold closing/clamping position) of the crosshead or the position of the movable platen.

The toggle mechanism 150 amplifies the driving force of the mold clamping motor 160 and transmits the amplified driving force to the movable platen 120. The amplification factor of the toggle mechanism 150 is also referred to as a toggle factor. The toggle factor is changed depending on an angle θ between the first and second links 152 and 153 (hereinafter also referred to as a "link angle θ"). The link angle θ is obtained from the position of the crosshead 151. In a case where the link angle θ is 180°, the toggle factor is maximum.

In a case where a thickness of the mold unit 800 is changed due to replacement of the mold unit 800, a change in a temperature of the mold unit 800, or the like, a mold space is adjusted so that a predetermined mold closing/clamping force is obtained during mold closing/clamping. In adjusting a mold space, the distance L between the stationary platen 110 and the toggle bracket 130 is adjusted so that the link angle θ of the toggle mechanism 150 at a time of mold contact at which, for example, the movable mold 820 contacts the stationary mold 810 is a predetermined angle.

The mold closing/clamping unit 100 includes a mold space adjusting mechanism 180. The mold space adjusting mechanism 180 adjusts the distance L between the stationary platen 110 and the toggle bracket 130 to adjust a mold space. A timing at which a mold space is adjusted is, for example, between the end of a molding cycle and the start of the next molding cycle. The mold space adjusting mechanism 180 includes, for example, spindle shafts 181 formed at rear end portions of the columns 140, spindle nuts 182 rotatably supported by the toggle bracket 130 so as to be unable to move back and forth, and a mold space adjusting motor 183 that rotates the spindle nuts 182 screwed to the spindle shafts 181.

The spindle shaft 181 and the spindle nut 182 are provided for each column 140. A rotational driving force of the mold space adjusting motor 183 can be transmitted to a plurality of spindle nuts 182 via a rotational driving force transmission unit 185. The plurality of spindle nuts 182 can be rotated synchronously. It is also possible to rotate the plurality of spindle nuts 182 individually by changing a transmission channel of the rotational driving force transmission unit 185.

The rotary driving force transmission unit 185 includes, for example, gears and the like. In this case, a driven gear is formed on an outer periphery of each spindle nut 182, a driving gear is attached to an output shaft of the mold space adjusting motor 183, and an intermediate gear that meshes with a plurality of driven gears and the driving gear is rotatably supported at a center portion of the toggle bracket 130. The rotary driving force transmission unit 185 may include a belt, pulleys and the like instead of the gears.

The operation of the mold space adjusting mechanism 180 is controlled by the controller 700. The controller 700 drives the mold space adjusting motor 183 to rotate the spindle nuts 182. As a result, the position of the toggle bracket 130 with respect to the columns 140 is adjusted so that the distance L between the stationary platen 110 and the toggle bracket 130 is adjusted. A plurality of mold space adjusting mechanisms may be used in combination.

The distance L is measured using a mold space adjustment motor encoder 184. The mold space adjustment motor encoder 184 measures a rotation amount and a rotation direction of the mold space adjustment motor 183 and sends Sig signals indicating detection results thereof to the control device 700. The detection results of the mold space adjusting motor encoder 184 are used for monitoring and controlling the position of the toggle beam 130 and the distance L. A toggle beam position detector for measuring the position of the toggle beam 130 and a distance detector for measuring the distance L are not limited to the mold space adjusting motor encoder 184, and general detectors may be used.

The mold closing/clamping unit 100 may include a mold temperature controller that adjusts the temperature of the mold unit 800. The mold unit 800 includes a flow channel for a temperature control medium therein. The mold temperature controller adjusts a temperature of a temperature control medium supplied to the flow channel of the mold unit 800 to adjust the temperature of the mold unit 800.

The mold closing/clamping unit 100 of the present embodiment is of a horizontal type in which a mold opening/closing direction is a horizontal direction, but may be of a vertical type in which a mold opening/closing direction is a vertical direction.

The mold closing/clamping unit 100 of the present embodiment includes the mold closing/clamping motor 160 as a drive unit, but may include a hydraulic cylinder instead of the mold closing/clamping motor 160. Further, the mold closing/clamping unit 100 may include a linear motor for opening and closing the mold, and may include an electromagnet for closing/clamping the mold.

(Ejector unit)

In describing the ejector unit 200, as in describing the mold closing/clamping unit 100, the moving direction of the movable platen 120 in a case where the mold is to be closed (for example, the positive X-axis direction) corresponds to a front side, and the moving direction of the movable platen 120 in a case where the mold is to be opened (for example, the negative X-axis direction) corresponds to a back side.

The ejector unit 200 is attached to the movable platen 120 and moves back and forth together with the movable platen 120. The ejector unit 200 includes ejector rods 210 that eject the molded products from the molding unit 800 and a drive mechanism 220 that moves the ejector rods 210 in the moving direction of the movable platen 120 (X-axis direction).

The ejector rods 210 are arranged in through holes of the movable plate 120 so as to be able to move back and forth. Front end portions of the ejector rods 210 are in contact with an ejector plate 826 of the movable mold 820. The front end portions of the ejector rods 210 may be connected to the ejector plate 826 or may not be connected thereto.

The drive mechanism 220 includes, for example, an ejector motor and a motion conversion mechanism that converts a rotary motion of the ejector motor into a linear motion of the ejector rods 210. The motion conversion mechanism includes a spindle shaft and a spindle nut screwed to the spindle shaft. Balls or rollers may be interposed between the spindle shaft and the spindle nut.

The ejector unit 200 performs an ejection process under the control of the controller 700. In the ejection process, the ejector rods 210 are caused to move forward from a standby position to an ejection position at a set moving speed so that the ejector plate 826 is caused to move forward to eject the molded products. Thereafter, the ejector motor is driven to cause the ejector rods 210 to move backward at a set moving speed and cause the ejector plate 826 to move backward to the original standby position.

The position and the moving speed of each ejector rod 210 are measured using, for example, an ejector motor encoder. The ejector motor encoder measures rotation of the ejector motor and sends a signal indicating a detection result thereof to the controller 700. An ejector rod position detector for measuring the position of each ejector rod 210 and an ejector rod moving speed detector for measuring the moving speed of each ejector rod 210 are not limited to the ejector motor encoder, and general detectors may be used.

(injection unit)

In the description of the injection unit 300, in contrast to the description of the mold closing/clamping unit 100 and the Description of the ejector unit 200, a movement direction of a screw 330 during filling (for example, the negative X-axis direction) corresponds to a front side, and a movement direction of the screw 330 during plasticizing (for example, the positive X-axis direction) corresponds to a rear side.

The injection unit 300 is installed on a slide base 301, and the slide base 301 is arranged to be able to move back and forth with respect to the injection unit frame 920. The injection unit 300 is arranged to be able to move back and forth with respect to the mold unit 800. The injection unit 300 contacts the mold unit 800 and fills the cavity spaces 801 formed in the mold unit 800 with a molding material. The injection unit 300 includes, for example, a cylinder 310 that heats the molding material, a nozzle 320 provided at a front end portion of the cylinder 310, the screw 330 that is arranged in the cylinder 310 so as to be able to move back and forth and is rotatable, a plasticizing motor 340 that rotates the screw 330, an injection motor 350 that causes the screw 330 to move back and forth, and a load detector 360 that measures a load transmitted between the injection motor 350 and the screw 330.

The cylinder 310 heats the molding material supplied from a supply port 311 to the interior. The molding material includes, for example, a resin and the like. The molding material is formed in the form of pellets, for example, and is supplied to the supply port 311 in a solid state. The supply port 311 is formed at a rear portion of the cylinder 310. A cooler 312 such as a water cooling cylinder is provided at an outer periphery of the rear portion of the cylinder 310. First heating units 313 such as band heaters and first temperature measuring devices 314 are provided at the outer periphery of the cylinder 310 in front of the cooler 312.

The cylinder 310 is divided into a plurality of zones in an axial direction of the cylinder 310 (for example, the X-axis direction). The first heating unit 313 and the first temperature measuring device 314 are provided in each of the plurality of zones. In each of the plurality of zones, a set temperature is set, and the control device 700 controls the first heating units 313 so that temperatures measured by the first temperature measuring devices 314 reach the set temperatures.

The nozzle 320 is provided at the front end portion of the cylinder 310 and is pressed against the molding unit 800. Second heating units 323 and second temperature measuring devices 324 are provided at an outer periphery of the nozzle 320. The control device 700 controls the second heating units 323 so that the measuring temperature of the nozzle 320 reaches a setting temperature.

The screw 330 is arranged in the cylinder 310 so as to be capable of moving back and forth and is rotatable. In a case where the screw 330 is rotated, a molding material is fed forward along a spiral groove of the screw 330. The molding material is gradually melted by heat from the cylinder 310 while being fed forward. When the liquid molding material is fed to the front of the screw 330 and accumulated in a front portion of the cylinder 310, the screw 330 is caused to move backward. Thereafter, in a case where the screw 330 is caused to move forward, the liquid molding material accumulated in front of the screw 330 is injected from the nozzle 320, and the molding unit 800 is filled with the molding material.

At a front portion of the screw 330, a backflow prevention ring 331 is attached so as to be able to move back and forth as a backflow prevention valve that prevents backflow of the molding material flowing backward from the front of the screw 330 in a case where the screw 330 is pushed forward.

In a case where the screw 330 is caused to move forward, the backflow prevention ring 331 is pushed backward by the pressure of the molding material accumulated in front of the screw 330 and moves backward relative to the screw 330 to a closing position (see 2 ) at which the flow channel for a molding material is closed. Accordingly, the molding material accumulated in front of the screw 330 is prevented from flowing to the rear side.

On the other hand, in a case where the screw 330 is rotated, the backflow prevention ring 331 is pushed forward by the pressure of the molding material fed forward along the spiral groove of the screw 330 and moves forward relative to the screw 330 to an opening position (see 1 ), at which the flow channel for a molding material is opened. Accordingly, the molding material is conveyed to the front of the screw 330.

The backflow prevention ring 331 can be either of a rotating type, which men rotated with the worm 330, or a non-rotating type which is not rotated together with the worm 330.

The injection unit 300 may include a drive source that causes the backflow prevention ring 331 to move back and forth with respect to the screw 330 between the opening position and the closing position.

The plasticizing motor 340 rotates the screw 330. A drive source that rotates the screw 330 is not limited to the plasticizing motor 340 and may be, for example, a hydraulic pump or the like.

The injection motor 350 causes the screw 330 to move forward and backward. A motion conversion mechanism that converts a rotational motion of the injection motor 350 into a linear motion of the screw 330 and the like are provided between the injection motor 350 and the screw 330. The motion conversion mechanism includes, for example, a screw shaft and a screw nut screwed to the screw shaft. Balls, rollers, or the like may be provided between the screw shaft and the screw nut. A drive source that causes the screw 330 to move forward and backward is not limited to the injection motor 350, and may be, for example, a hydraulic cylinder or the like.

The load detector 360 measures a load transmitted between the injection motor 350 and the screw 330. The measured load is converted into a pressure by the control device 700. The load detector 360 is provided in a transmission channel for a load between the injection motor 350 and the screw 330 and measures a load acting on the load detector 360.

The load detector 360 sends a signal of the measured load to the controller 700. The load measured by the load detector 360 is converted into a pressure acting between the screw 330 and the molding material, and is used to control and monitor a pressure received by the screw 330 from the molding material, a back pressure acting on the screw 330, a pressure acting from the screw 330 on the molding material, and the like.

A pressure detector that measures the pressure of the molding material is not limited to the load detector 360, and a general detector may be used. For example, a nozzle pressure sensor or a mold internal pressure sensor may be used. The nozzle pressure sensor is installed in the nozzle 320. The mold internal pressure sensor is installed in the molding unit 800.

The injection unit 300 performs a plasticizing process, a filling process, a pressure-holding process, and the like under the control of the controller 700. The filling process and the pressure-holding process may also be collectively referred to as an injection process.

In the plasticizing process, the plasticizing motor 340 is driven so that the screw 330 is rotated at a set speed to feed the molding material forward along the spiral groove of the screw 330. Accordingly, the molding material is gradually melted. When the liquid molding material is fed to the front of the screw 330 and accumulated in the front portion of the cylinder 310, the screw 330 is caused to move backward. A rotation speed of the screw 330 is measured using, for example, a plasticizing motor encoder 341. The plasticizing motor encoder 341 measures rotation of the plasticizing motor 340 and sends a signal indicating a detection result thereof to the controller 700. A screw speed detector that measures the rotation speed of the screw 330 is not limited to the plasticizing motor encoder 341, and a general detector may be used.

In the plasticizing process, the injection motor 350 may be driven to apply a set back pressure to the screw 330 to limit the sudden backward movement of the screw 330. The back pressure applied to the screw 330 is measured using, for example, the load detector 360. In a case where the screw 330 moves backward to a plasticizing completion position and a predetermined amount of molding material is accumulated in front of the screw 330, the plasticizing process is completed.

Positions and rotation speeds of the screw 330 in the plasticizing process are collectively set as a set of setting conditions. For example, a plasticizing start position, a rotation speed switching position, and a plasticizing completion position are set. These positions are arranged in this order from the front to the rear and indicate start points and end points of sections in which the rotation speeds are set. The rotation speed is set for each section. One rotation speed switching position may be set, or multiple rotation speed switching positions may be set. It may be that the rotation speed Switching position is not set. Furthermore, a back pressure is set for each section.

In the filling process, the injection motor 350 is driven to cause the screw 330 to move forward at a set moving speed and to fill the cavity spaces 801 formed in the molding unit 800 with the liquid molding material accumulated in front of the screw 330. The position and the moving speed of the screw 330 are measured using, for example, an injection motor encoder 351. The injection motor encoder 351 measures rotation of the injection motor 350 and sends a signal indicating a detection result thereof to the controller 700. In a case where the position of the screw 330 reaches a set position, switching of the filling process to the pressure holding process (so-called V/P switching) is performed. A position at which V/P switching is performed is also referred to as a V/P switching position. The set movement speed of the screw 330 can be changed depending on the position of the screw 330, a time or the like.

Positions and movement speeds of the screw 330 in the filling process are collectively set as a series of setting conditions. For example, a filling start position (also referred to as an "injection start position"), a movement speed switching position, and a V/P switching position are set. These positions are arranged in this order from the back to the front and indicate start points and end points of sections in which the movement speeds are set. The movement speed is set for each section. One movement speed switching position may be set, or multiple movement speed switching positions may be set. The movement speed switching position may not be set.

For each section in which the movement speed of the screw 330 is set, an upper limit of the pressure of the screw 330 is set. The pressure of the screw 330 is measured by the load detector 360. In a case where the pressure of the screw 330 is equal to or lower than a set pressure, the screw 330 moves forward at a set movement speed. On the other hand, in a case where the pressure of the screw 330 exceeds the set pressure, the screw 330 moves forward at a movement speed lower than the set movement speed for the purpose of protecting the mold, so that the pressure of the screw 330 is equal to or lower than the set pressure.

After the position of the screw 330 in the filling process reaches the V/P switching position, the screw 330 may be caused to temporarily stop and the V/P switching may then be performed. Immediately before the V/P switching, instead of the screw 330 being stopped, the screw 330 may move forward at a very low speed or move backward at a very low speed. Further, a screw position detector for measuring the position of the screw 330 and a screw movement speed detector for measuring the movement speed of the screw 330 are not limited to the injection motor encoder 351, and general detectors may be used.

In the pressure holding process, the injection motor 350 is driven to push the screw 330 forward to maintain the pressure of the molding material at a front end portion of the screw 330 (hereinafter also referred to as a "holding pressure") at a set pressure, and to push a molding material remaining in the cylinder 310 toward the molding unit 800. A shortage of the molding material due to cooling shrinkage inside the molding unit 800 can be replenished. The holding pressure is measured using, for example, the load detector 360. A set value of the holding pressure can be changed depending on a time elapsed since the start of the pressure holding process or the like. A plurality of holding pressures and a plurality of holding times at which the holding pressure is held in the pressure holding process can be set, and can be collectively set as a set of setting conditions.

The molding material filled in the cavity spaces 801 formed in the molding unit 800 is gradually cooled in the pressure-holding process, and an inlet of the cavity spaces 801 is closed by the solidified molding material at the completion time of the pressure-holding process. This state is called a gate seal, and the backflow of the molding material from the cavity spaces 801 is prevented. A cooling process is started after the pressure-holding process. The molding material in the cavity spaces 801 is solidified in the cooling process. The plasticizing process may be performed during the cooling process for the purpose of shortening a molding cycle time.

The injection unit 300 of the present embodiment is of an in-line screw type, but may be of a pre-plasticizing type or the like. chen. A pre-plasticizing type injection unit supplies a molding material melted in a plasticizing cylinder to an injection cylinder and injects the molding material from the injection cylinder into a molding unit. In the plasticizing cylinder, a screw is arranged so as to be rotatable and incapable of moving forward and backward, or a screw is arranged in the plasticizing cylinder so as to be rotatable and capable of moving forward and backward. Meanwhile, a plunger is arranged in the injection cylinder so as to be capable of moving forward and backward.

Further, the injection unit 300 of the present embodiment is of a horizontal type in which the axial direction of the cylinder 310 is a horizontal direction, but may be of a vertical type in which the axial direction of the cylinder 310 is a vertical direction. A mold closing/clamping unit to be combined with a vertical type injection unit 300 may be of a vertical type or a horizontal type. Similarly, a mold closing/clamping unit to be combined with a horizontal type injection unit 300 may be of a horizontal type or a vertical type.

(movement unit)

In the description of the moving unit 400, as in the description of the injection unit 300, the moving direction of the screw 330 during filling (for example, the negative X-axis direction) corresponds to a front side, and the moving direction of the screw 330 during plasticizing (for example, the positive X-axis direction) corresponds to a back side.

The moving unit 400 causes the injection unit 300 to move back and forth with respect to the molding unit 800. Further, the moving unit 400 presses the nozzle 320 against the molding unit 800 to generate a nozzle contact pressure. The moving unit 400 includes a hydraulic pump 410, a motor 420 as a drive source, a hydraulic cylinder 430 as a hydraulic actuator, and the like.

The hydraulic pump 410 includes a first port 411 and a second port 412. The hydraulic pump 410 is a pump that can be rotated in both directions and sucks hydraulic fluid (for example, oil) from one of the first port 411 and the second port 412 and discharges the hydraulic fluid from the other thereof to generate hydraulic pressure in a case where a rotation direction of the motor 420 is changed. The hydraulic pump 410 can also suck hydraulic fluid from a tank and discharge the hydraulic fluid from the first port 411 or the second port 412.

The motor 420 causes the hydraulic pump 410 to operate. The motor 420 drives the hydraulic pump 410 in a rotational direction corresponding to a control signal sent from the controller 700 with torque corresponding to the control signal. The motor 420 may be an electric motor or may be an electric servomotor.

The hydraulic cylinder 430 includes a cylinder body 431, a piston 432, and a piston rod 433. The cylinder body 431 is fixed to the injection unit 300. The piston 432 divides the interior of the cylinder body 431 into a front chamber 435 as a first chamber and a rear chamber 436 as a second chamber. The piston rod 433 is fixed to the stationary plate 110.

The front chamber 435 of the hydraulic cylinder 430 is connected to the first port 411 of the hydraulic pump 410 via a first flow channel 401. In a case where hydraulic fluid discharged from the first port 411 is supplied to the front chamber 435 via the first flow channel 401, the injection unit 300 is pushed forward. The injection unit 300 moves forward so that the nozzle 320 is pressed against the stationary mold 810. The front chamber 435 functions as a pressure chamber that generates the nozzle contact pressure of the nozzle 320 with the pressure of the hydraulic fluid discharged from the hydraulic pump 410.

On the other hand, the rear chamber 436 of the hydraulic cylinder 430 is connected to the second port 412 of the hydraulic pump 410 via a second flow channel 402. In a case where hydraulic fluid discharged from the second port 412 is supplied to the rear chamber 436 of the hydraulic cylinder 430 via the second flow channel 402, the injection unit 300 is pushed backward. The injection unit 300 moves backward so that the nozzle 320 is separated from the stationary mold 810.

The moving unit 400 includes the hydraulic cylinder 430 in the present embodiment, but the present invention is not limited thereto. For example, an electric motor and a motion converting mechanism that converts a rotational motion of the electric motor into a linear motion of the injection unit 300 may be used instead of the hydraulic cylinder 430.

(Control device)

The control device 700 is formed of, for example, a computer and includes a central processing unit (CPU) 701, a storage medium 702 such as a memory, an input interface 703 and an output interface 704 as shown in 1 and 2 . The control device 700 causes the CPU 701 to execute a program stored in the storage medium 702 to perform various types of control. Further, the control device 700 receives a signal from the outside via the input interface 703 and transmits a signal to the outside via the output interface 704.

The control device 700 repeatedly performs the plasticizing process, the mold closing process, the pressurizing process, the mold closing/clamping process, the filling process, the pressure holding process, the cooling process, the pressure releasing process, the mold opening process, the ejection process, and the like to repeatedly produce molded products. A series of operations for obtaining molded products, for example, operations from the start of one plasticizing process to the start of the next plasticizing process, is also referred to as a "shot" or a "molding cycle." Further, a time required for one shot is also referred to as a "molding cycle time" or a "cycle time."

For example, a molding cycle includes the plasticizing process, the mold closing process, the pressurizing process, the mold closing/clamping process, the filling process, the pressure holding process, the cooling process, the pressure releasing process, the mold opening process, and the ejection process in this order. The order mentioned here is an order in which the respective processes are started. The filling process, the pressure holding process, and the cooling process are performed during the mold closing/clamping process. The start of the mold closing/clamping process may coincide with the start of the filling process. The completion of the pressure releasing process coincides with the start of the mold opening process.

Multiple processes may be performed simultaneously for the purpose of shortening a molding cycle time. For example, a plasticizing process may be performed during a cooling process of a previous molding cycle, or it may be performed during a mold closing/clamping process. In this case, the mold closing process may be performed at the beginning of the molding cycle. Further, the filling process may be started during the mold closing process. Further, the ejection process may be started during the mold opening process. In a case where an on-off valve for opening and closing a flow channel of the nozzle 320 is provided, the mold opening process may be started during the plasticizing process. This is because a molding material does not leak from the nozzle 320 as long as the on-off valve closes the flow channel of the nozzle 320 even if the mold opening process is started during the plasticizing process.

A molding cycle may include processes other than the plasticizing process, the mold closing process, the pressurizing process, the mold closing/clamping process, the filling process, the pressure holding process, the cooling process, the pressure releasing process, the mold opening process, and the ejection process.

For example, after the completion of the pressure holding process, a pre-plasticization suck-back process for causing the screw 330 to move backward to a preset plasticization start position may be performed before the start of the plasticization process. Since the pressure of the molding material accumulated in front of the screw 330 can be reduced before the start of the plasticization process, the sudden backward movement of the screw 330 at the start time of the plasticization process can be prevented.

Furthermore, after the completion of the plasticizing process, a post-plasticizing suck-back process for causing the screw 330 to move backward to a preset filling start position (also referred to as an "injection start position") may be performed before the start of the filling process. Since the pressure of the molding material accumulated in front of the screw 330 can be reduced before the start of the filling process, leakage of the molding material from the nozzle 320 before the start of the filling process can be prevented.

The control device 700 is connected to an operation unit 750 that receives an input operation performed by a user and to a display unit 760 that displays a screen. The operation unit 750 and the display unit 760 may be formed of, for example, a touch panel 770 and may be integrated with each other. The touch panel 770 as the display unit 760 displays a screen under the control of the control device 700. On the screen of the touch panel 770, for example, information such as the settings of the injection molding machine 10 and the current state of the injection molding machine 10. Further, on the screen of the touch panel 770, for example, operation parts such as buttons or input pads used to receive an input operation performed by a user may be displayed. The touch panel 770 as the operation unit 750 detects an input operation performed by a user on the screen and outputs a signal corresponding to the input operation to the control device 700. Accordingly, for example, a user may operate the operation section provided on the screen to set the injection molding machine 10 (including input of a setting value) while checking information displayed on the screen. Further, a user may operate the operation section provided on the screen to cause the operation of the injection molding machine 10 corresponding to the operation section to be performed. The operation of the injection molding machine 10 may be, for example, the operation (including stopping) of the mold closing/clamping unit 100, the ejector unit 200, the injection unit 300, the moving unit 400, or the like. Further, the operation of the injection molding machine 10 may be switching the screen displayed on the touch panel 770 as the display unit 760, or the like.

The operation unit 750 and the display unit 760 of the present embodiment have been described as being integrated with the touch panel 770, but they may be provided independently of each other. Further, a plurality of operation units 750 may be provided. The operation unit 750 and the display unit 760 are arranged on an operation side (negative Y-axis direction) of the mold closing/clamping unit 100 (more specifically, the stationary platen 110).

(Wiring structure of injection molding machine)

Next, a wiring structure 600 of the injection molding machine 10 according to an embodiment will be described with reference to 3 to 6 described. As in 4 As shown, the wiring structure 600 of the injection molding machine 10 includes a terminal block 610 that electrically connects first wires 601 and second wires 602, and a terminal box 620 that accommodates the terminal block 610.

The terminal block 610 includes first terminals 611 to which one end of the first wires 601 is detachably mounted, and second terminals 612 to which one end of the second wires 602 is detachably mounted. Since the first terminals 611 and the second terminals 612 are electrically connected to each other in advance, the terminal block 610 electrically connects the first wires 601 and the second wires 602.

The terminal block 610 may include multiple combinations of the first terminals 611 and the second terminals 612, and may electrically connect the first wires 601 and the second wires 602 for each of the combinations of the first terminals 611 and the second terminals 612. Each of the first wires 601 and the second wires 602 may be a wire harness, and the terminal block 610 may electrically connect the wire harnesses.

Each of the first wires 601 and the second wires 602 includes at least one of a high-current wire and a low-current wire. The high-current wire is an electric wire that supplies current. The low-current wire is an electric wire that transmits an electric signal. The first wires 601 and the second wires 602 connect, for example, the injection motor 350 and the 1 and 2 shown control device 700 electrically.

The injection motor 350 is an example of a power unit. The power unit is not limited to the injection motor 350 and may be the plasticizing motor 340, the first heating unit 313 or the second heating unit 323, which are shown in 1 and 2 The power unit may be a cooling fan (not shown). The terminal block 610 and the terminal box 620 are attached to the power unit.

For example, as in 4 As shown, the terminal block 610 and the terminal box 620 are attached to an upper surface of the injection motor 350. Heat dissipation fins 353 are formed on an outer peripheral surface of the injection motor 350, and a fixing plate 603 is fixed to upper ends of the heat dissipation fins 353. The terminal block 610 and the terminal box 620 are fixed to an upper surface of the fixing plate 603 with screws or the like.

The second wires 602 extend from the injection motor 350 to the terminal block 610 and pass through a through hole 604 of the mounting plate 603 in the center thereof. Meanwhile, the first wires 601 extend from the control device 700 (see 1 and 2 ) to the connection block 610. The control device 700 is arranged in the interior of the injection unit frame 920.

As in 1 and 2 As shown, the injection molding machine 10 is long in the X-axis direction. This tendency is significant in a case where the Screw 330, the plasticizing motor 340 and the injection motor 350 are arranged in this order on the same straight line from a negative side in the X-axis direction to a positive side in the X-axis direction. As shown in 3 , the injection motor encoder 351 is further provided on the positive side of the injection motor 350 in the X-axis direction.

Accordingly, the first wires 601 can be taken out of the terminal box 620 to the counter-operation side (a positive side in the Y-axis direction) as shown in 4 shown, or may be taken out of the terminal box 620 to the operation side (a negative side in the Y-axis direction). Compared with a case where the first wires 601 are taken out of the terminal box 620 to the positive side in the X-axis direction, the length of the injection molding machine 10 can be shortened, and noise of an electric signal of the injection motor encoder 351 can be reduced.

The terminal box 620 includes terminals 621 for the first wires 601. One or more first wires 601 are inserted into an opening 621. The number of openings 621 is two in the present embodiment, but may be one or three or more. Further, the opening 621 is formed of a through hole 622 in the present embodiment, but the through hole 622 may not be provided. However, in a case where the through hole 622 is provided, friction between the terminal box 620 and the first wires 601 can be reduced.

One end of the first wires 601 is detachably mounted to the terminal block 610. Accordingly, the injection motor 350 or the control device 700 is easily replaced, so maintainability is good. Since the first wires 601 enter and come out of the openings 621 in a case where one end of the first wires 601 is detachably mounted to the terminal block 610, water droplets are likely to enter the openings 621.

The terminal box 620 includes an opening wall 631 and a ceiling wall 641. The openings 621 are formed in the opening wall 631. The ceiling wall 641 is provided above the terminal block 610. The ceiling wall 641 is provided to partition an inverted conical rotating body B of which a rotation axis is a straight line A extending directly upward from a center of the opening 621 and an apex angle α is 120°. The rotating body B is a virtual solid.

According to the present embodiment, the ceiling wall 641 can block all paths of water droplets falling at an angle of 60° or less with respect to the vertical direction toward the center of the opening 621. Accordingly, since IPX3 of the International Protection (IP) Code defined by the International Electrotechnical Commission (IEC) can be satisfied, the entry of water droplets into the junction box 620 from the opening 621 of the junction box 620 can be inhibited.

It is preferable that the ceiling wall 641 blocks all paths of water droplets falling not only toward the center of the opening 621 but also toward all points of the opening 621 having an angle of 60° or less with respect to the vertical direction. Accordingly, it is preferable that the ceiling wall 641 is provided to divide inverted posed conical bodies of revolution B of which center lines are straight lines A extending directly upward from all points (arbitrary points) of the opening 621 and apex angles α are 120°.

In a case where there are a plurality of openings 621, the ceiling wall 641 may partition an inverted conical rotary body B, a tip of which is the center of each of the plurality of openings 621. Meanwhile, it is not necessary to block all paths of water droplets only with the ceiling wall 641. For example, the ceiling wall 641 and a pair of side walls 642 and 643 described later may together block all paths of water droplets.

According to the present embodiment, since a wall of the junction box 620, for example, the ceiling wall 641, blocks the paths of water droplets, it is not necessary to provide a waterproof seal such as a packing at the opening 621. Accordingly, since a waterproof property can be improved with a simple structure, the manufacturing cost of the junction box 620 can be reduced.

For example, the opening wall 631 may be provided sideways, obliquely downwards, or downwards, and is provided sideways in the present embodiment. The ceiling wall 641 includes an extension portion 641a extending from the opening wall 631 on a side of the opening wall 631 opposite to the terminal block 610. The entry of water droplets into the terminal box 620 from the opening 621 of the terminal box 620 can be inhibited by the extension portion 641a.

As in 5 As shown, the terminal box 620 includes a box-shaped portion 630 and a cover member 640. The box-shaped portion 630 includes the opening wall 631 and includes an opening 639 on an upper surface thereof. The cover member 640 includes the ceiling wall 641 closing the opening 639 formed on the upper surface of the box-shaped portion 630 and a pair of side walls 642 and 643 between which a pair of side surfaces of the box-shaped portion 630 are sandwiched.

The ceiling wall 641 is provided laterally. The ceiling wall 641 has a rectangular shape in a plan view, for example. The pair of side walls 642 and 643 extend downward from a pair of sides of the ceiling wall 641. The lid part 640 has an inverted U-shaped cross section. For example, the lid part 640 is obtained by bending a metal plate.

As in 4 As shown, the ceiling wall 641 and the pair of side walls 642 and 643 extend from the opening wall 631 on a side of the opening wall 631 opposite to the terminal block 610. Since not only the ceiling wall 641 but also the pair of side walls 642 and 643 extend from the opening wall 631, not only water droplets falling from above onto the terminal box 620 but also water droplets blown onto the terminal box 620 in a horizontal direction can be blocked.

The box-shaped portion 630 includes, for example, the opening wall 631, a facing wall 632 facing the opening wall 631, a pair of side walls 633 and 634, and a bottom wall 635. The bottom wall 635 has a rectangular shape in a plan view, and the opening wall 631, the facing wall 632, and the pair of side walls 633 and 634 surround four sides of the bottom wall 635. An opening 638 is formed in the bottom wall 635. The terminal block 610 is provided in the opening 638. Screws 605 are provided around the opening 638. The screws 605 fasten the bottom wall 635 to the fixing plate 603.

The box-shaped section 630 is obtained by bending, for example, a 6 The metal plate 630A includes the opening wall 631, the facing wall 632, the pair of side walls 633 and 634, and the bottom wall 635 on the same plane. Each of the opening wall 631, the facing wall 632, and the pair of side walls 633 and 634 is vertically bent at a boundary with the bottom wall 635, and rises upward from the boundary with the bottom wall 635.

In a case where the metal plate 630A is bent, a cut is formed at a boundary between each of the pair of side walls 633 and 634 and the opening wall 631, but these cuts do not need to be closed by welding. The entry of water droplets through these cuts can be inhibited in a case where the ceiling wall 641 and the pair of side walls 642 and 643 extend from the opening wall 631 on a side opposite to the terminal block 610. In a case where welding is omitted, the manufacturing cost of the box-shaped portion 630 can be reduced.

Also, in a case where the metal plate 630A is bent, a cut is formed at a boundary between each of the pair of side walls 633 and 634 and the facing wall 632, but these cuts need not be closed by welding. The entry of water droplets through these cuts can be inhibited in a case where the ceiling wall 641 and the pair of side walls 642 and 643 extend from the facing wall 632 on a side opposite to the terminal block 610. In a case where welding is omitted, the manufacturing cost of the box-shaped portion 630 can be reduced.

In contrast to the opening wall 631, the facing wall 632 is not provided with the opening 621. For this reason, as in 4 As shown, the extension length of the ceiling wall 641 and the pair of side walls 642 and 643 from the facing wall 632 may be shorter than the extension length thereof extending from the opening wall 631. The extension length of the ceiling wall 641 and the pair of side walls 642 and 643 from the facing wall 632 may be such that the entry of water droplets through the unwelded cuts can be inhibited.

As in 6 As shown, the box-shaped portion 630 may include side flaps 651 and 652. The side flaps 651 and 652 are formed seamlessly with the opening wall 631, are bent from the opening wall 631, and face the side walls 633 and 634. The side flaps 651 and 652 are disposed within the side walls 633 and 634 and prevent the penetration of water droplets through the bent cuts.

Although not shown, the side flap 651 may be formed seamlessly with the side wall 633 but not with the opening wall 631, bent from the side wall 633 and facing the opening wall 631. Furthermore, the side flap 652 may be formed seamlessly with the side wall 634 but not with the Opening wall 631 may be formed, bent from side wall 634 and facing opening wall 631.

The box-shaped portion 630 may include side flaps 653 and 654. The side flaps 653 and 654 are formed seamlessly with the facing wall 632, are bent from the facing wall 632, and face the side walls 633 and 634. The side flaps 653 and 654 are disposed within the side walls 633 and 634 and prevent the penetration of water drops through the bend cuts.

Although not shown, the side flap 653 may be formed seamlessly with the side wall 633 but not with the facing wall 632, bent from the side wall 633, and face the facing wall 632. Likewise, the side flap 654 may be formed seamlessly with the side wall 634 but not with the facing wall 632, bent from the side wall 634, and face the facing wall 632.

The box-shaped portion 630 may include upper flaps 655 and 656. The upper flap 655 is formed seamlessly with the opening wall 631, is bent from the opening wall 631, and faces the ceiling wall 641. Further, the upper flap 656 is formed seamlessly with the facing wall 632, is bent from the opening wall 631, and faces the ceiling wall 641.

As in 4 As shown, the upper flaps 655 and 656 are provided under the ceiling wall 641. The ceiling wall 641 is fixed to the upper flaps 655 and 656 with screws 606. Work for fixing the ceiling wall 641 is performed after one end of the first wires 601 is detachably mounted to the terminal block 610. When one end of the first wires 601 is detachably mounted to the terminal block 610, the opening 639 formed on the upper surface of the box-shaped portion 630 is opened.

The opening wall 631 in the present embodiment, as shown in 4 and the like, but can, as shown in 7 shown, downward. In this case, the ceiling wall 641 does not need to include the extension portion 641a. Even in a case where the opening wall 631 is provided obliquely downward and an inclination angle β of the opening wall 631 with respect to a horizontal plane is 30° or less, as shown in 8A shown, the extension section 641a is not required.

In a case where the opening wall 631 as in 8C shown, is provided laterally or the opening wall 631 as in 8B shown, is provided obliquely downward and an inclination angle β of the opening wall 631 with respect to a horizontal plane exceeds 30°, the ceiling wall 641 may include the extension portion 641a. Accordingly, the ceiling wall 641 or the like may block all paths of water droplets falling toward the center of the opening 621 at an angle of 60° or less with respect to the vertical direction.

It is conceivable that water droplets may enter the terminal box 620 along the first wires 601. Accordingly, the first wire 601 may include an inclined portion 601a positioned outside the terminal box 620 and which is inclined downward as the distance from the opening 621 increases. Water droplets flow downward along the inclined portion 601a. Accordingly, the entry of water droplets may be inhibited.

The extension portion 641a is provided so that an inclination angle γ of a straight line E connecting a tip end of the extension portion 641a to an upper end 601b of the inclined portion 601a positioned outside the terminal box 620 with respect to a horizontal plane is 30° or less. Water droplets adhere to a portion of the inclined portion 601a below the upper end 601b and flow downward along the inclined portion 601a. Accordingly, the entry of water droplets can be further inhibited. The inclination angle γ is measured on a vertical surface cut along a straight line including the inclined portion 601a in a case where the terminal box 620 is viewed from directly above.

The first terminals 611 of the terminal block 610 may be arranged in the openings 621, and one end of the first wires 601 may be detachably mounted to the first terminals 611 in the openings 621. Even in this case, the entry of water droplets can be inhibited, and the adhesion of water droplets to the first terminals 611 can be inhibited.

The terminal box of the injection molding machine, the wiring structure of the injection molding machine and the injection molding machine according to the embodiments of the present invention have been described above, but the present invention is not limited to the above-mentioned embodiments and the like. Various modifications, corrections, substitutions, additions, omissions and combinations can be made within the scope of the appended claims. Of course, this belongs to the technical scope of the present invention.

Short description of reference symbols

10

Injection molding machine

350

Injection engine (power unit)

600

Wiring structure

601

first wire

602

second wire

610

Connection block

620

Junction box

621

opening

630

box-shaped section

631

Opening wall

640

Cover part

641

Ceiling wall

QUOTES INCLUDED IN THE DESCRIPTION

This list of documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions.

Cited patent literature

• JP2015107616 [0002]

Claims (7)

A terminal box (620) of an injection molding machine (10) accommodating a terminal block (610) to which one end of a first wire (601) is detachably mounted, the terminal box (620) comprising: a wall (641) provided to partition an inverted conical rotary body (B) of which a rotary axis is a straight line (A) extending directly upward from a center of an opening (621) for the first wire (601), and an apex angle is 120°. Connection box (620) of an injection moulding machine (10) according to Claim 1 , further comprising: an opening wall (631) through which the opening (621) is formed; and a ceiling wall (641) provided above the terminal block (610), wherein the opening wall (631) is provided laterally or obliquely downward, and the ceiling wall (641) includes an extension portion (641a) extending from the opening wall (631) on a side of the opening wall (631) opposite to the terminal block (610). Connection box (620) of an injection moulding machine (10) according to Claim 2 , further comprising: a box-shaped portion (630) including the opening wall (631) and including an opening (639) on an upper surface thereof; and a lid member (640) including the ceiling wall (641) closing the opening (639) of the box-shaped portion (630) and a pair of side walls (642, 643) between which a pair of side surfaces of the box-shaped portion (630) are sandwiched, wherein the ceiling wall (641) and the pair of side walls (642, 643) extend from the opening wall (631) on the side of the opening wall (631) opposite to the terminal block (610). Connection box (620) of an injection moulding machine (10) according to Claim 2 or 3 wherein the first wire (601) includes an inclined portion (601a) positioned outside the terminal box (620) and inclined downward as the distance from the opening (621) increases, and the extension portion (641a) is provided such that a straight line (A) connecting a tip end of the extension portion (641a) to an upper end (601b) of the inclined portion (601a) is inclined at an angle of 30° or less with respect to a horizontal plane. Connection box (620) of an injection moulding machine (10) according to Claim 1 , further comprising: an opening wall (631) through which the opening (621) is formed; and a ceiling wall (641) provided above the terminal block (610), the opening wall (631) being provided downward. Wiring structure (600) of an injection molding machine (10), comprising: the terminal box (620) according to one of the Claims 1 until 3 ; and the connection block (610). Injection molding machine (10), comprising: the connection box (620) according to one of the Claims 1 until 3 ; the terminal block (610); and a power unit to which the terminal box (620) is attached.

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