JP2013018244A - Vertical injection molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vertical injection molding machine that has a purge material receiving plate for receiving purge material discharged from an injection nozzle without any increase in the total height of the machine.SOLUTION: The vertical injection molding machine 100 includes: an upper platen 11 for mounting an upper fixture 15 on a lower side surface 11U in the vertical direction; and a lower platen 10 for mounting a lower fixture 16 on an upper side surface in the vertical direction. Here, the upper platen 11 includes an injection nozzle insertion hole 50 vertically penetrating the upper platen 11, and a purge material receiving plate insertion hole 51 communicating with the injection nozzle insertion hole 50 from the side surface of the upper platen 11.

Description

  The present invention relates to a vertical injection molding machine that performs purging.

  2. Description of the Related Art Conventionally, a vertical injection molding machine including a purge take-out device for discharging a purge material used for a purge operation is known (for example, see Patent Document 1).

  “Purge operation” refers to an injection cylinder that is used when restarting the operation of a vertical injection molding machine that has been stopped due to some abnormality or when molding a molded product using another resin in the same mold apparatus. It is an act of discharging the resin remaining inside the injection cylinder. The “purge material” is a resin used for discharging the resin remaining in the injection cylinder to the outside of the injection cylinder at the time of purging.

  In the purge operation, for example, the purge material discharged from the injection nozzle is received and discharged at the purge material receiving position using a substantially rectangular parallelepiped purge material tray.

  Specifically, this purge take-out device moves the injection device main body upward from the upper platen and draws out the injection nozzle upward from a nozzle through-hole penetrating the upper platen in the vertical direction. Thereafter, a purge material receiving tray at a purge material discharge position, which is a position where the purge material receiving tray and the injection nozzle do not contact each other, is prepared at a purge material receiving position which is a position directly below the injection nozzle, and the purge material discharged from the injection nozzle Receive in the purge material tray.

JP 2004-306497 A

  However, in order to release the purge material to the purge material tray, the purge take-out device described in Patent Document 1 needs to raise the injection port of the injection nozzle to a position higher than the upper opening of the purge material tray. This leads to an increase in the overall height of the injection molding machine.

  Accordingly, an object of the present invention is to provide a vertical injection molding machine that allows a purge material discharged from an injection nozzle to be received by a purge material tray without increasing the overall height.

  In order to achieve the above-described object, a vertical injection molding machine according to an embodiment of the present invention includes an upper platen on which an upper mold can be attached to a vertical lower surface and a lower mold on a vertical upper surface. A vertical injection molding machine having a lower platen to which the upper platen can be attached, wherein the upper platen includes an injection nozzle insertion hole penetrating the upper platen in a vertical direction, and the injection nozzle insertion hole from a side surface of the upper platen. And a purge material tray insertion hole that leads to.

  By the means described above, the present invention can provide a vertical injection molding machine that allows the purge material discharged from the injection nozzle to be received by the purge material tray without increasing the overall height.

It is the schematic which shows the structural example of the vertical injection molding machine which concerns on 1st Example of this invention. It is an enlarged view of the broken-line circle area | region II of FIG. It is a top view of the movable platen according to the first embodiment. It is sectional drawing of the movable platen which concerns on a 1st Example. It is a top view of the movable platen which concerns on a 2nd Example. It is sectional drawing of the movable platen which concerns on a 2nd Example. It is a top view of the movable platen which concerns on the 2nd Example which shows the state which inserted the purge material receptacle into the purge material receptacle insertion hole.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic front view showing the main configuration of a vertical injection molding machine according to a first embodiment of the present invention.

  The vertical injection molding machine 100 mainly includes a fixed platen 10, a movable platen 11, a toggle support 12, a tie bar 13, an ejector servo motor 14, a mold clamping servo motor 17, a toggle mechanism 20, a speed reduction mechanism 30, and an injection device. 40.

  The movable platen 11 is a member for supporting the upper mold 15, and each of the four tie bars 13 (two of the four are shown in the figure) using a fixing nut 11 </ b> N. It is fixedly attached to the upper end and moves up and down as the tie bar 13 moves up and down.

  The fixed platen 10 is a member for supporting the lower mold 16, and is fixedly attached to a frame (not shown) and has a structure in which four tie bars 13 are slidably penetrated in the vertical direction in the figure.

  The lower mold 16 is fixedly attached to the upper surface of the fixed platen 10. Thus, when the movable platen 11 is lowered for mold closing (when the movable platen 11 is moved closer to the fixed platen 10), the upper mold 15 fixedly attached to the lower surface of the movable platen 11 is provided. Contact the lower mold 16.

  The toggle support 12 is a member for operating the toggle mechanism 20, and is fixedly attached to the lower ends of the four tie bars 13, and the toggle mechanism 20 is disposed between the fixed platen 10 and the toggle support 12. It is configured as follows.

  The tie bar 13 is a member that penetrates the fixed platen 10 and connects the movable platen 11 and the toggle support 12. With this configuration, when the distance between the fixed platen 10 and the toggle support 12 is decreased by the toggle mechanism 20, the distance between the fixed platen 10 and the movable platen 11 increases. On the other hand, when the interval between the fixed platen 10 and the toggle support 12 is increased by the toggle mechanism 20, the interval between the fixed platen 10 and the movable platen 11 decreases.

  FIG. 1 shows a state where the distance between the fixed platen 10 and the toggle support 12 is increased and the upper mold 15 and the lower mold 16 are brought into contact with each other and are clamped (clamped state).

  The ejector servo motor 14 is a member for moving an ejector pin (not shown) up and down. After the injection molding process is completed and the mold is opened, the ejector servo motor 14 is moved downward to the molded product in the lower mold 16. Then, the ejector pin is pressed from the lower mold 16 so that the molded product is pushed out.

  The mold clamping servomotor 17 is a member for operating a ball screw mechanism (not shown) that converts a rotational force into a linear motion, is fixedly attached to the toggle support 12, and moves up and down the toggle support 12. Move up and down together. The mold clamping servomotor 17 transmits the generated rotational force to the ball screw mechanism via the speed reduction mechanism 30.

  The toggle mechanism 20 is a mechanism for increasing or decreasing the distance between the fixed platen 10 and the toggle support 12 to decrease or increase the distance between the fixed platen 10 and the movable platen 11 (that is, performing mold closing or mold opening). It is.

  The speed reduction mechanism 30 is a member for transmitting the rotational force generated by the mold clamping servomotor 17 to the ball screw mechanism. In this embodiment, the speed reduction mechanism 30 is stretched between a drive pulley attached to the drive shaft of the mold clamping servomotor 17, a driven pulley attached to the ball screw mechanism, and the drive pulley and the driven pulley. Consists of an endless belt. The speed reduction mechanism 30 may be composed of a sprocket and a chain, may be composed of a plurality of gears, or may be composed of other mechanical elements for transmitting rotational force.

  The injection device 40 is a device for injecting molten resin into a cavity space (not shown) formed between the upper mold 15 and the lower mold 16, and mainly includes an injection cylinder 41, an injection A cylinder heater 42, an injection nozzle 43, and an injection nozzle heater 44 are included.

  FIG. 2 is an enlarged view of a broken-line circle region II in FIG. 3 is a top view of the movable platen 11, and FIG. 4 is a cross-sectional view of the movable platen 11 as seen from the direction indicated by the arrow IV in FIG. 2 to 4, the fixing nut 11N and the tie bar 13 are omitted for clarity, and the injection device 40 is further omitted in FIGS. In FIG. 3, holes 11 </ b> H formed at the four corners of the movable platen 11 are through holes for allowing the tie bar 13 to pass therethrough.

  2 to 4, the movable platen 11 has a substantially rectangular parallelepiped shape having an upper surface 11T, a bottom surface 11U, a front surface 11F, a rear surface 11B, a left side surface 11L, and a right side surface 11R, and receives the injection nozzle 43. The injection nozzle insertion hole 50 is provided.

  The injection nozzle insertion hole 50 extends through the movable platen 11 in the vertical direction, has an upper opening 50T at the center of the upper surface 11T of the movable platen 11, and has a lower opening 50U at the center of the bottom surface 11U of the movable platen 11. Have

  In the present embodiment, the injection nozzle insertion hole 50 is formed such that the size of the lower opening 50U is smaller than the size of the upper opening 50T. However, the injection nozzle insertion hole 50 has other shapes as long as the tip of the injection nozzle 43 can be touched to the upper mold 15 without bringing the injection nozzle 43 into contact with the movable platen 11. May be. For example, in the injection nozzle insertion hole 50, the size of the lower opening 50U may be larger than the size of the upper opening 50T, and the size of the lower opening 50U is equal to the size of the upper opening 50T. Also good.

  The movable platen 11 has a purge material tray insertion hole 51 for receiving the purge material tray 60 on the front surface 11F.

  In the present embodiment, the purge material tray insertion hole 51 has a first portion 51F and a second portion 51B. The first portion 51F forms an outer opening 51Fe in the central portion of the front surface 11F, extends horizontally through the movable platen 11 to the injection nozzle insertion hole 50, and forms an inner opening 51Fi on the inner wall of the injection nozzle insertion hole 50. . Further, the second portion 51B is formed by forming an inner opening 51Bi of the same shape facing the inner opening 51Fi of the first portion 51F on the inner wall opposite to the inner opening 51Fi across the central axis of the injection nozzle insertion hole 50. The platen 11 extends toward the rear surface 11 </ b> B and terminates at an end surface 51 </ b> Be formed inside the movable platen 11.

  In the present embodiment, the areas of the sections perpendicular to the longitudinal direction of the purge material tray insertion hole 51 are equal. However, the area of the cross section perpendicular to the longitudinal direction of the purge material tray insertion hole 51 may be different as long as it is larger than the corresponding cross sectional area of the purge material tray 60.

  The purge material tray insertion hole 51 forms an outer opening 51Fe at the center of the front surface 11F, but forms an outer opening on the other side surface (the rear surface 11B, the left side surface 11L, or the right side surface 11R). It may be.

  The purge material tray insertion hole 51 preferably has a side surface (for example, a central portion of the side surface) of the movable platen 11 so that the opening of the purge material tray insertion hole 51 is not formed on the upper surface 11T and the bottom surface 11U of the movable platen 11. Formed. This is to maintain the rigidity of the movable platen 11.

  2 to 4 show a state in which the purge material tray 60 is inserted into the purge material tray insertion hole 51. The purge material tray 60 has a bottom surface 60U, a front surface 60F, a rear surface 60B, a left side surface 60L, and a right side surface 60R, and a substantially rectangular parallelepiped recess (a portion that receives the purge material) having an inner bottom surface 60BT that is open at the top surface. ) To form a substantially rectangular parallelepiped shape.

  In this embodiment, the front surface 60F and the rear surface 60B of the purge material tray 60 have a surface area that matches the area of the cross section perpendicular to the longitudinal direction of the purge material tray insertion hole 51, and the left side surface 60L and the right side of the purge material tray 60 The surface 60R has a length that is longer than the length of the purge material tray insertion hole 51 in the longitudinal direction.

  If the purge material tray 60 can be inserted into the purge material tray insertion hole 51, its length, height, and width are arbitrary, and other than a rectangular parallelepiped that is rectangular in a side view. It may have a shape (for example, a shape that is semicircular or trapezoidal in a side view).

  As shown in FIG. 3, when the purge material tray 60 is inserted into the purge material tray insertion hole 51 in the direction indicated by the arrow AR1, the rear surface 60B crosses the injection nozzle insertion hole 50 and the purge material tray insertion hole is inserted. 51 is brought into contact with the end face 51Be of the second portion 51B. At this time, the purge material receiving tray 60 is located at the purge material receiving position so as to cover the lower opening 50U of the injection nozzle insertion hole 50 in a top view, and the purge material discharged from the injection nozzle 43 into the recess having the inner bottom surface 60BT. To be accepted.

  It should be noted that the purge material tray 60 can be inserted into and removed from the purge material tray insertion hole 51 manually by an operator or automatically using an appropriate driving device or sensor.

  Further, the purge material receiving tray 60 may have a handle attached to the front surface 11F for manual insertion / removal to / from the purge material receiving tray insertion hole 51 by the operator.

  Further, the purge material tray insertion hole 51 may extend not only vertically but also obliquely with respect to the front surface 11F of the movable platen 11.

  The second portion 51B of the purge material tray insertion hole 51 forms an inner opening 51Bi on the inner wall of the injection nozzle insertion hole 50, extends through the movable platen 11 in the horizontal direction, and forms an outer opening on the rear surface 11B. You may do it. In this way, the purge material tray insertion hole 51 passes through the movable platen 11 in the horizontal direction from the front surface 11F of the movable platen 11 through the injection nozzle insertion hole 50 to the rear surface 11B of the movable platen 11. Good.

  Thereby, the purge material tray 60 can enter from the front surface 11F of the movable platen 11 and exit from the rear surface 11B of the movable platen 11, or can enter from the rear surface 11B and exit from the front surface 11F.

  Also in this case, the purge material tray 60 can be inserted into and removed from the purge material tray insertion hole 51 manually by the operator, or automatically by using an appropriate driving device or sensor. Good.

  Further, purging is performed while moving the purge material tray 60 longer than the length of the movable platen 11 (for example, the distance between the front surface 11F and the rear surface 11B) in the purge material tray insertion hole 51. May be. This is because the purge that is intermittently performed while the purge material tray 60 is inserted into and removed from the purge material tray insertion hole 51 a plurality of times is performed once in and out. Even in this case, the length of the purge material tray 60 may be shorter than the length of the movable platen 11.

  In the present embodiment, the purge material tray 60 has a single recess having an inner bottom surface BT, but may have a plurality of recesses separated by a partition wall or the like.

  With the above configuration, the vertical injection molding machine having the movable platen 11 provided with the purge material tray insertion hole 51 includes a space for arranging the purge material tray 60 directly below the injection nozzle 43 above the movable platen 11. Since it is not necessary, the overall height can be reduced as compared with a conventional vertical injection molding machine that requires such a space.

  The vertical injection molding machine having the movable platen 11 having the purge material tray insertion hole 51 raises the injection nozzle 43 to a position higher than the upper opening of the purge material tray 60 inserted into the purge material tray insertion hole 51. Just purging can be done. Therefore, as compared with the conventional vertical injection molding machine in which it is necessary to raise the injection nozzle to a position higher than the upper opening of the purge material tray placed on the movable platen, the rising amount of the injection nozzle 43 during purging is suppressed. It is possible to reduce the time required for starting the purge.

  Next, another configuration example 11X of the movable platen will be described with reference to FIGS.

  FIG. 5 is a top view of the movable platen 11 </ b> X and corresponds to FIG. 3 and shows a state before the purge material tray 60 is inserted into the purge material tray insertion hole 51. FIG. 6 is a cross-sectional view of the movable platen 11X as seen from the direction indicated by the arrow VI in FIG. 5 along the one-dot chain line L2, and corresponds to FIG. FIG. 7 is a top view of the movable platen 11X corresponding to FIG. 5, and shows a state after the purge material tray 60 is inserted into the purge material tray insertion hole 51. FIG. Therefore, the same or corresponding components are referred to using the same reference numerals as those in FIGS.

  The movable platen 11X is different from the movable platen 11 in that it has the purge material tray support recesses 52L and 52R instead of the second portion 51B of the purge material tray insertion hole 51, but is common in other points.

  The purge material tray support recesses 52L and 52R are elements for supporting the purge material tray 60 at the purge material receiving position when the purge material tray 60 is inserted into the purge material tray insertion hole 51.

  As shown in FIGS. 5 and 6, the purge material tray support recesses 52 </ b> L and 52 </ b> R are formed in the inner wall of the injection nozzle insertion hole 50 and receive the two lower corners of the purge material tray 60 which is a substantially rectangular parallelepiped.

  Specifically, as shown in FIG. 7, when the purge material tray 60 is inserted into the purge material tray insertion hole 51 in the direction indicated by the arrow AR 2, the purge material tray 60 crosses the injection nozzle insertion hole 50 at the two lower corners. Each is brought into contact with each of the recesses 52L and 52R for supporting the purge material tray. At this time, the purge material receiving tray 60 is located at the purge material receiving position so as to cover the lower opening 50U of the injection nozzle insertion hole 50 in a top view, and the purge material discharged from the injection nozzle 43 into the recess having the inner bottom surface 60BT. To be accepted.

  It should be noted that the purge material tray 60 can be inserted into and removed from the purge material tray insertion hole 51 manually by an operator or automatically using an appropriate driving device or sensor.

  In this embodiment, the purge material tray 60 is disposed at the purge material receiving position with its two lower corners supported by the purge material tray support recesses 52L and 52R. However, the purge material tray 60 has an outer surface shape (in this case, a curved surface shape) that matches the shape of the inner wall of the injection nozzle insertion hole 50, and the outer surface shape is brought into contact with the inner wall of the injection nozzle insertion hole 50. In this state, it may be arranged at the purge material receiving position. In this case, the purge material tray support recesses 52L and 52R are omitted.

  With the above configuration, the vertical injection molding machine having the movable platen 11X can realize the same effect as the vertical injection molding machine having the movable platen 11.

  Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications and substitutions can be made to the above-described embodiments without departing from the scope of the present invention. Can be added.

  For example, in the above-described embodiment, the platen 11 moves with respect to the platen 10, but the platen 10 may move with respect to the platen 11.

  In the above-described embodiment, the single purge material tray insertion hole 51 is formed in the movable platen 11, but a plurality of purge material tray insertion holes 51 may be formed.

  In the above-described embodiment, the purge material tray insertion hole 51 has a width smaller than the diameter of the injection nozzle insertion hole 50 in the top view, but has a width larger than the diameter of the injection nozzle insertion hole 50 in the top view. You may have.

  DESCRIPTION OF SYMBOLS 10 ... Fixed platen 11 ... Movable platen 12 ... Toggle support 13 ... Tie bar 14 ... Servo motor for ejectors 15 ... Upper die 16 ... Lower die 17 ... Servo motor for mold clamping 20 ... Toggle mechanism 30 ... Deceleration mechanism 40 ... Injection device 41 ... Injection cylinder 42 ... Injection cylinder heater 43 ... Injection nozzle 44 ... For injection nozzle Heater 50 ... Injection nozzle insertion hole 51 ... Purge material tray insertion hole 52L, 52R ... Purge material tray support recess 100 ... Vertical injection molding machine

Claims (3)

A vertical injection molding machine having an upper platen capable of attaching an upper mold to a lower surface in the vertical direction and a lower platen capable of attaching a lower mold to the upper surface in the vertical direction,
The upper platen has an injection nozzle insertion hole penetrating the upper platen in the vertical direction, and a purge material tray insertion hole leading from the side surface of the upper platen to the injection nozzle insertion hole.
A vertical injection molding machine characterized by that. The purge material tray insertion hole is formed in the upper platen so that the opening of the purge material tray insertion hole is not formed on the upper surface of the upper platen and the lower surface of the vertical direction.
The vertical injection molding machine according to claim 1. A purge material tray can be disposed at a position corresponding to the injection nozzle insertion hole in the purge material tray insertion hole.
The vertical injection molding machine according to claim 1 or 2, characterized in that