JP2022115791A - Injection molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an injection molding machine capable of reducing the need for grease removal operation.

SOLUTION: An injection molding machine comprises: a stationary platen to support a stationary metal mold; a movable platen which supports a movable metal mold, and is movable toward and away from the stationary platen; and an intermediate metal mold support frame 301c which is disposed between the stationary platen and the movable platen, rotatably supports an intermediate metal mold 22, and is movable toward and away from the stationary platen. The intermediate metal mold support frame 301c has a pair of support parts 40 separated in a width direction W from each other; a rotation part to support the intermediate metal mold 22 rotatably relative to the support parts 40; and contact inhibiting means 45 to inhibit a molding from contacting grease flowing out of the rotation part.

SELECTED DRAWING: Figure 4

COPYRIGHT: (C)2022,JPO&INPIT

Description

The present invention relates to an injection molding machine.

Conventionally used injection molding machines of this type include, for example, the configuration disclosed in Patent Document 1 below. That is, the conventional injection molding machine includes a stationary platen that supports a stationary mold, a movable platen that supports a movable mold, and a platen that is disposed between the stationary platen and the movable platen to rotatably support an intermediate mold. and an intermediate mold support frame. The movable platen and the intermediate mold support frame are provided so as to be able to advance and retreat with respect to the stationary platen. A plurality of first core molds protrude from one of the front and rear surfaces of the intermediate mold, and a plurality of second core molds protrude from the other surface. In the clamped state, resin is filled into the voids between the first core mold and the fixed mold, and the preform is injection molded. When the resin has cooled to a predetermined temperature, the mold is opened and the intermediate mold is rotated 180°. After that, the molds are clamped again, the first core mold with the preform attached is inserted into the movable mold for blowing, and air is blown out to perform blow molding. At this time, the resin is filled in the space between the second core mold and the fixed mold, and the preform is injection molded. Blow molding and injection molding can be done simultaneously.

The intermediate mold support frame has a pair of pillars spaced apart from each other in the width direction and extending in the height direction. The column portion is provided with a shaft insertion hole through which a rotating shaft that rotates together with the intermediate mold is inserted. Oil such as grease is applied to the inside of the shaft insertion hole in order to facilitate the rotation of the rotating shaft. A packing is attached to the shaft insertion hole to prevent oil from flowing out from the shaft insertion hole.

JP 2018-167579 A

In the conventional structure as described above, since the packing is attached to the shaft insertion hole, the maintenance cost increases for monitoring the dropout of the packing and replacing the packing. It is conceivable to omit the packing to avoid an increase in maintenance costs, but in order to avoid the oil flowing out from the shaft insertion hole from adhering to the molded product, it is necessary to frequently remove the oil.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide an injection molding machine that can reduce the need for removing oil.

An injection molding machine according to the present invention comprises: a stationary platen that supports a stationary mold; a movable platen that supports the movable mold and is provided to move back and forth with respect to the stationary platen; and an intermediate mold support frame provided to rotatably support the intermediate mold and move forward and backward with respect to the stationary platen, the intermediate mold support frames being spaced apart from each other in the width direction It has a pair of supporting parts provided, a rotating part that rotatably supports the intermediate mold with respect to the supporting parts, and a contact suppressing means that suppresses contact of the molded product with oil flowing out from the rotating part. ing.

According to the injection molding machine of the present invention, the contact suppressing means suppresses the contact of the molded product with the grease flowing out from the rotating part, so that the necessity of removing the grease can be reduced.

1 is a partial cross-sectional view showing an injection molding machine according to Embodiment 1 of the present invention; FIG. FIG. 2 is an explanatory view showing a mold open state of the mold apparatus of FIG. 1; FIG. 2 is an explanatory view showing a mold clamping state of the mold device of FIG. 1; FIG. 4 is a rear view showing the intermediate mold support frame of FIG. 3; 5 is an enlarged rear view of the intermediate mold support frame showing an enlarged area V of FIG. 4; FIG. 6 is a side view of the pivot and lower support of FIG. 5 viewed from the inside in the width direction; FIG. FIG. 7 is an explanatory diagram showing the effect of the provision of the protrusions in FIG. 6 ; FIG. 8 is a rear view showing an intermediate mold support frame of the injection molding machine according to Embodiment 2 of the present invention;

EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing this invention is demonstrated with reference to drawings. The present invention is not limited to each embodiment, and can be embodied by modifying the constituent elements without departing from the scope of the invention. Moreover, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in each embodiment. For example, some components may be deleted from all the components shown in the embodiments. Furthermore, components of different embodiments may be combined as appropriate.

Embodiment 1.
FIG. 1 is a partial cross-sectional view showing an injection molding machine 1 according to Embodiment 1 of the present invention. An injection molding machine 1 shown in FIG. 1 is a device for molding a molded product by injection molding together with a mold device 2 . More specifically, the injection molding machine 1 of the present embodiment can also be referred to as a so-called injection blow molding machine. It is used in injection blow molding, in which a molded product is manufactured by supplying a fluid such as gas to a preform in a cavity for injection molding to expand the preform.

The mold device 2 has a fixed mold 20, a movable mold 21 and an intermediate mold 22 in the illustrated example. The movable mold 21 and the intermediate mold 22 are provided so as to be able to advance and retreat with respect to the fixed mold 20 (displaceable in directions approaching and separating from the fixed mold 20). The stationary mold 20 and the intermediate mold 22 are molds for defining and forming the above-described injection molding cavity inside (between each other). The intermediate mold 22 and the movable mold 21 are molds for defining and forming the blow molding cavity described above. The mold device 2 can be appropriately attached to the injection molding machine 1 or replaced depending on the shape of the molded product to be manufactured. The mold assembly 2 is not considered part of the injection molding machine 1 here.

The injection molding machine 1 has an injection device 100 , a moving device 200 and a mold clamping device 300 .

(Injection device)
The injection device 100 is a device for melting a molding material and injecting it into the mold device 2 . The injection device 100 mainly includes a cylinder 101, a screw 102, a heater 103 and a motor box 104.

Hereinafter, the positions of each component may be described using the terms front side and rear side. The terms "front side" and "rear side" refer to the fixed platen 301a, which will be described later. For example, when looking at the injection device 100 located on the right side of the stationary platen 301a in FIG. 1, the left side approaching the stationary platen 301a is the front side, and the right side away from the stationary platen 301a is the rear side.

The cylinder 101 is a tubular member extending toward the mold device 2 . The cross-sectional shape of the cylinder 101 is preferably circular, but may be other shapes. The cylinder 101 is provided with a supply port 101a and a nozzle 101b. The supply port 101a is an opening to which a hopper for charging molding material into the cylinder 101 can be attached. The supply port 101 a can be arranged on the rear side of the cylinder 101 and in front of the motor box 104 . A water-cooled cylinder 101c can be provided in the vicinity of the supply port 101a. The nozzle 101 b is an opening provided at the tip near the mold device 2 . The cross-sectional area of the nozzle 101b is made smaller than the cross-sectional area of the cylinder 101 on the rear side.

The screw 102 is a longitudinal member inserted inside the cylinder 101 . The center axis of the screw 102 preferably extends parallel to the center axis of the cylinder 101 . A flight is spirally provided around the screw 102 . The molding material can be sent to the tip of the cylinder 101 as the screw 102 rotates.

The heater 103 is arranged surrounding the outer circumference of the cylinder 101 . The heater 103 is arranged around the cylinder 101 including around the nozzle 101b. The heater 103 can have a shape such as a band shape. The heater 103 may be integrally formed in the axial direction, or may have a plurality of heater portions separated from each other in the axial direction (horizontal direction in FIG. 1) as shown. The inside of the cylinder 101 may be heated at different temperatures for each position of the heater portion. Each heater section may be provided with a temperature sensor.

The motor box 104 is arranged behind the cylinder 101 and the screw 102 . Although not shown, the motor box 104 contains a metering motor for rotating the screw 102 around the central axis in order to fill the tip of the cylinder 101 with a predetermined amount of molding material, and a An injection motor that advances and retreats the screw 102 in each direction of the direction and the direction away from the mold device 2, a pressure detection sensor that detects the pressure that the screw 102 receives from the molding material, and the like are arranged.

Although this injection molding machine 1 is of the in-line screw type, it may be a pre-plasticization type injection molding machine in which the plasticizing cylinder and plasticizing screw are separated from the injection cylinder and injection plunger in terms of structure and function. It is possible.

(moving device)
The moving device 200 is a device for moving the injection device 100 forward and backward with respect to the mold device 2 . The moving device 200 is provided, for example, in the lower portion of the motor box 104 of the injection device 100, and is a forward/retreat drive mechanism that advances and retreats the injection device 100 with respect to a fixed platen 301a, which will be described later.

Various mechanisms can be employed as the advance/retreat drive mechanism that constitutes the moving device 200. The moving device 200 shown in the figure includes a hydraulic pump 201 such as hydraulic pressure, and an electric pump operation for operating the hydraulic pump 201. and a double-acting hydraulic cylinder 203 to which hydraulic fluid is supplied from the hydraulic pump 201 to push and pull a piston rod whose tip is fixed to the fixed platen 301a.

This moving device 200 further includes a slide base 204 and a guide 205 . The slide base 204 is attached with the above-described hydraulic pump 201 , pump operating motor 202 and hydraulic cylinder 203 . A guide 205 is laid on the frame Fr and can guide the linear motion of the slide base 204 . The slide base 204 and the guide 205 realize forward and backward displacement of the injection device 100 placed on the top of the slide base 204 .

The moving device 200 separates the injection device 100 from the mold device 2 or moves the injection device 100 closer to the mold device 2 to move the nozzle 101b of the cylinder 101 of the injection device 100 toward the mold device 2 with a predetermined pressure. It is possible to perform a so-called nozzle touch, such as pressing.

(mold clamping device)
The mold clamping device 300 is a device for opening and closing the mold device 2 between a mold clamping state and a mold open state. The mold clamping device 300 displaces the movable mold 21 and the intermediate mold 22 with respect to the fixed mold 20 of the mold device 2 to open and close the mold device 2, and puts the mold device 2 into a clamped state and a mold closed state. state or mold open state.

A mold clamping device 300 of this injection molding machine 1 mainly has a mold holding mechanism 301 and a platen moving mechanism 302 .

The mold holding mechanism 301 has a fixed platen 301a, a movable platen 301b and an intermediate mold support frame 301c. The fixed platen 301a is arranged between the injection device 100 and the mold device 2, and fixed to the frame Fr. The movable platen 301b is arranged so that the mold device 2 is positioned between it and the fixed platen 301a, and is provided so as to be able to advance and retreat with respect to the fixed platen 301a. The intermediate mold support frame 301c is arranged between the stationary platen 301a and the movable platen 301b, and is provided so as to be able to advance and retreat with respect to the stationary platen 301a. The movable platen 301b and the intermediate mold support frame 301c are provided so as to move independently of each other. The stationary platen 301a supports the stationary mold 20, the movable platen 301b supports the movable mold 21, and the intermediate mold support frame 301c supports the intermediate mold 22 so as to be rotatable.

One end of one or a plurality of tie bars 301d for guiding the displacement of the movable platen 301b and the intermediate mold support frame 301c is attached to the fixed platen 301a. The other end of tie bar 301d is attached to rear platen 304, which will be described later. A guide member 301e that guides the movement of the movable platen 301b and the intermediate mold support frame 301c is laid on the frame Fr.

At a position where the movable platen 301b and the intermediate mold support frame 301c are separated from the fixed platen 301a, the intermediate mold 22 is opened from the fixed mold 20 and the movable mold 21, and the mold is opened.
By moving the movable platen 301b and the intermediate mold support frame 301c toward the fixed platen 301a from the spaced position where the intermediate mold 22 is opened from the fixed mold 20 and the movable mold 21, the intermediate mold 22 moves toward the fixed mold. 20 and the movable mold 21 are in a mold closed state.
By moving the movable platen 301b and the intermediate mold support frame 301c closer to each other with the fixed platen 301a from the mold closed state, a mold clamping state in which the intermediate mold 22 is pressed against the fixed mold 20 and the movable mold 21 is obtained. Become.

Since most of the mold clamping device 300 except for the stationary platen 301a is located on the left side of the stationary platen 301a in FIG. The rear side is the left facing side and is separated from the stationary platen 301a.

The platen moving mechanism 302 is a mechanism mainly for moving the movable platen 301b. The platen moving mechanism 302 includes a rear platen 304 movably mounted on the frame Fr, a mold clamping motor 305 provided on the rear platen 304, and a linear movement of the movable platen 301b in the displacement direction. and a toggle mechanism 307 that increases the force transmitted to the motion conversion mechanism 306 and transmits it to the movable platen 301b.

Among them, the motion conversion mechanism 306 can be various mechanisms capable of converting rotary motion into linear motion. It is assumed to include a mating nut 306b. It is also possible to use the motion conversion mechanism 306 as a ball screw.

The toggle mechanism 307, which increases the transmission force from the motion conversion mechanism 306, is formed by swingably connecting a plurality of links 307a to 307c that connect the rear platen 304 and nut 306b to the movable platen 301b with joints. . Although the number and shape of the links and joints can be changed as appropriate, as shown in FIG. A pair of link groups consisting of positioned links 307a to 307c are provided to be pivotably connected.

In addition to the mold clamping motor 305 described above, a mold thickness adjusting motor 308 can also be provided on the rear platen 304 . The die thickness adjusting motor 308 is moved on the stationary platen 301a and the frame Fr by applying rotational driving force to the screw shaft and nut connected to the extensions of the respective tie bars 301d of the die holding mechanism 301. It functions to adjust the gap with the rear platen 304 arranged via rails. As a result, even when the mold device 2 is replaced or when the thickness of the mold device 2 is changed due to a change in temperature, a desired mold clamping force can be applied to the mold device 2. Mold thickness can be adjusted. Although illustration is omitted, the mold thickness can be adjusted by making the fixed platen side movable on the frame Fr and fixing the rear platen side.

The illustrated mold clamping device 300 is of a horizontal type in which the moving direction of the movable platen 301b is parallel to the horizontal direction, but it can also be of a vertical type in which the moving direction is vertical.

Next, the mold device 2 and the mold clamping device 300 will be described in more detail with reference to FIGS. 2 and 3. FIG. FIG. 2 is an explanatory diagram showing a mold opening state of the mold apparatus 2 of FIG. 1, and FIG. 3 is an explanatory diagram showing a mold clamping state of the mold apparatus 2 of FIG. 2 and 3(a) are enlarged side views of the mold device 2, and FIGS. 2 and 3(b) are cross-sectional views of the mold device 2 taken along the line BB in (a). is.

The intermediate mold 22 is rotatably supported by the intermediate mold support frame 301c via a rotating shaft 220. As shown in FIG. A driving means (not shown) is connected to the rotating shaft 220, and the intermediate mold 22 is rotatable so that the front and rear sides are reversed by the driving force of the driving means. The mold clamping device 300 has an intermediate mold moving mechanism 309 for moving the intermediate mold support frame 301c forward and backward with respect to the fixed platen 301a. The intermediate mold moving mechanism 309 has a hydraulic cylinder 309a attached to the stationary platen 301a, and a piston rod 309b which is movable forward and backward by the hydraulic cylinder 309a and whose one end is fixed to the intermediate mold support frame 301c. is doing. The intermediate mold moving mechanism 309 allows the intermediate mold supporting frame 301c and the intermediate mold 22 to move forward and backward independently of the movement of the movable platen 301b and the movable mold 21 by the platen moving mechanism 302. FIG. The hydraulic cylinder 309a of the intermediate mold moving mechanism 309 is fixed to the movable platen 301b, and the intermediate mold support frame 301c can advance and retreat integrally with the movable platen 301b, and further advance and retreat relative to the movable platen 301b. It may be said that

A plurality of projecting portions 221 are provided on both sides of the intermediate mold 22 in the front-rear direction. As particularly shown in FIG. 2(b), the fixed mold 20 is provided with a plurality of fixed-side concave portions 20a. In the clamped state shown in FIG. 3, the convex portion 221 of the intermediate mold 22 is inserted into the fixed side concave portion 20a, and the preform PF is positioned between the fixed side concave portion 20a and the convex portion 221. An injection molding cavity corresponding to the shape is defined. As shown in FIG. 2(a), in the mold open state, the preform PF is held on the outer surface of the convex portion 221 pulled out from the fixed side concave portion 20a.

The movable mold 21 has a split mold 210 that can be split in the width direction of the mold. The mold clamping device 300 has a split mold opening/closing mechanism 310 for opening and closing the split mold 210 . The split mold opening/closing mechanism 310 includes hydraulic cylinders 310a arranged on both sides of the movable mold 21, a piston rod 310b which is movable forward and backward by the hydraulic cylinders 310a and whose one end is fixed to the split mold 210, and a mold. It has a split mold connecting member 310c that connects the split molds 210 that are displaced in the same direction in the width direction. In the clamped state shown in FIG. 3, the split mold 210 is closed, and the convex portion 221 of the intermediate mold 22 is inserted into the split mold 210. Between the split mold 210 and the convex mold portion 221, A blow molding cavity corresponding to the shape of the molded article MP is defined. As shown in FIG. 2B, in the mold open state, the split mold 210 is opened and the molded product MP molded by the movable mold 21 drops from the movable mold 21. As shown in FIG.

(Operation of injection molding machine)
The injection molding machine 1 described above operates to perform the following steps.
2, the platen moving mechanism 302 moves the movable platen 301b toward the stationary platen 301a, and the intermediate mold moving mechanism 309 moves the intermediate mold support frame 301c toward the stationary platen 301a. perform the mold closing process.

Next, in a state in which a predetermined amount of molding material has already been accumulated and placed inside the injection device 100 by weighing, which will be described later, using the mold clamping device 300, as shown in FIG. A mold clamping process is performed in which the mold device 2 is placed in a mold clamped state. In the mold clamping process, an injection molding cavity is defined between the fixed mold 20 and the intermediate mold 22, and a blow molding cavity is defined between the movable mold 21 and the intermediate mold 22. .

Then, the molding material is injected toward the injection molding cavity of the mold device 2 by advancing the screw 102 to perform an injection step of filling the injection molding cavity with the molding material. In the injection process, after the injection molding cavity is filled with the molding material, the screw 102 is further advanced to hold the molding material inside the tip of the injection device 100 at a predetermined pressure. After that, the molding material filled in the injection molding cavity is cooled and solidified. Thereby, the preform PF is molded in the injection molding cavity. At this time, the molding material separately put into the injection device 100 is melted while being fed toward the tip of the injection device 100 by rotating the screw 102 under heating by the heater 103, and a predetermined amount of the molding material is melted at the tip. Weighing is performed to place the

In parallel with the injection process described above, a blowing process is performed in the blow molding cavity. A preform PF that has already been molded in the injection molding cavity before the intermediate mold 22 is turned over is placed in the blow molding cavity. In the blowing step, a fluid such as air or other gas is supplied to the preform PF, and the preform PF is expanded in the blow molding cavity to mold the molded product MP.

After that, the platen moving mechanism 302 and the intermediate mold moving mechanism 309 are operated to move the movable platen 301b and the intermediate mold support frame 301c away from the fixed platen 301a to open the mold device 2. carry out the process.

After the mold opening step, the split mold opening/closing mechanism 310 is used to open the split mold 210 of the movable mold 21, take out the molded product MP, and then close the split mold 210 of the movable mold 21. conduct.
Here, an intermediate mold rotating step is performed in which the intermediate mold 22 is turned over by a driving means connected to the rotating shaft 220 of the intermediate mold 22 . As a result, the convex portion 221 of the intermediate mold 22 on the side from which the molded product MP was collected in the split mold opening/closing process faces the fixed side concave portion 20a of the stationary mold 20 . On the other hand, the convex part 221 of the intermediate mold 22 on the side where the preform PF is molded in the injection process faces the split mold 210 of the movable mold 21 while holding the preform PF.
The intermediate mold rotating process can be performed at substantially the same time as the split mold opening/closing process, or before or after the split mold opening/closing process.

In injection molding using the injection molding machine 1, the above-described mold closing process, mold clamping process, injection process, blowing process, mold opening process, split mold opening/closing process, and intermediate mold rotating process are repeatedly performed.

Next, FIG. 4 is a rear view (viewed from the movable platen 301b side) showing the intermediate mold support frame 301c of FIG. As shown in FIG. 4, the intermediate mold support frame 301c is formed in a rectangular frame shape when viewed in the mold opening/closing direction. The intermediate mold support frame 301c includes a pair of support portions 40 spaced apart from each other in the width direction W, and a pair of beam portions 41 extending in the width direction W so as to connect upper and lower portions of the support portions 40. have. The support portion 40 of this embodiment extends in the height direction H. As shown in FIG. An annular portion 42 having a through-hole 420 penetrating through the intermediate mold support frame 301c in the advancing/retreating direction AR of the intermediate mold support frame 301c is provided at the upper portion and the lower portion of each support portion 40 . By inserting the tie bars 301d through the through holes 420, the advance and retreat of the intermediate mold support frame 301c are guided by the tie bars 301d. Note that the width direction W, the height direction H, and the advancing/retreating direction AR may be directions orthogonal to each other. The height direction H can be vertical. However, the direction in which the support part 40 extends is arbitrary, and may be inclined with respect to the vertical direction or may extend in the horizontal direction. Moreover, the shape of the support part 40 is also arbitrary.

The intermediate mold support frame 301 c has a rotating portion that rotatably supports the intermediate mold 22 with respect to the support portion 40 . The rotating portion of the present embodiment is configured by a shaft insertion hole 430 provided in the support portion 40. As shown in FIG. The support portion 40 is provided with a shaft support portion 43 and a lower support portion 44 . The shaft support portion 43 is arranged in the central portion of the support portion 40 in the direction in which the support portion 40 extends. The shaft insertion hole 430 is provided in the shaft support portion 43 . A rotary shaft 220 that rotates together with the intermediate mold 22 is inserted through the shaft insertion hole 430 . The shaft insertion hole 430 extends in the width direction W. As shown in FIG. The lower support portion 44 extends downward from the pivot portion 43 .

The shaft support portion 43 is formed to protrude inward in the width direction W from the lower support portion 44 . The shaft support portion 43 connects the shaft support inner wall 43a arranged inside the lower support inner wall 44a of the lower support portion 44 in the width direction W, the lower edge of the shaft support inner wall 43a, and the upper edge of the lower support inner wall 44a. It has a shaft support lower wall 43b.

Oil such as grease is applied to the inside of the shaft insertion hole 430 to facilitate the rotation of the rotary shaft 220 . A packing may be attached to the shaft insertion hole 430 to prevent oil from flowing out from the shaft insertion hole 430. However, in the present embodiment, no packing is attached to the shaft insertion hole 430 at least on the inner side in the width direction W. , the oil is allowed to flow out from the shaft insertion hole 430 at least on the inner side in the width direction W.

The intermediate mold support frame 301c of the present embodiment is contact suppressing means for suppressing contact of the molded product MP, which is molded by the movable mold 21 and then dropped from the movable mold 21, with oil flowing out from the shaft insertion hole 430. 45. The contact suppressing means 45 prevents the molded product MP from contacting the oil flowing out from the shaft insertion hole 430, so that the oil flowing out from the shaft insertion hole 430 adheres to the molded product MP without frequent removal of the oil. can be avoided, and the need for removing grease can be reduced.

Next, the contact suppression means 45 of this embodiment will be described in more detail with reference to FIGS. 5 and 6. FIG. 5 is an enlarged rear view of the intermediate mold support frame 301c showing an enlarged area V of FIG. 4, and FIG. It is a side view. 5 and 6, illustration of the intermediate mold 22 and the rotating shaft 220 is omitted.

As shown in FIGS. 5 and 6, the contact suppression means 45 of the present embodiment includes a projection 450 extending downward along the wall surface of the support portion 40 from the lower portion of the shaft insertion hole 430 on the wall surface of the support portion 40. there is Oil that has flowed out of the shaft insertion hole 430 and reached the projection 450 flows down along the projection 450 . That is, the protrusion 450 guides the flow of oil flowing out from the shaft insertion hole 430 . By inducing the flow of the grease away from the molded article MP falling from the movable mold 21, contact of the molded article MP with the grease is suppressed.

As particularly shown in FIG. 6, a projection 450 is preferably provided below the lower edge 430a of the shaft insertion hole 430 on the wall surface of the support portion 40. As shown in FIG. In other words, when the shaft insertion hole 430 and the protrusion 450 are viewed from the inside in the width direction W as shown in FIG. Preferably, protrusions 450 are provided so as to intersect at the bottom. Oil flowing out from the shaft insertion hole 430 tends to drip from the lower edge 430a. Therefore, since the projection 450 is provided below the lower edge 430a, the oil flowing out from the shaft insertion hole 430 can more reliably reach the projection 450, and the projection 450 more reliably guides the flow of the oil. can.

Above the position where the straight line L intersects the protrusion 450 , the protrusion 450 may extend at a position closer to the stationary platen 301 a or the movable platen 301 b than the lower edge 430 a of the shaft insertion hole 430 . This is to ensure that oil and fat that are about to drip before reaching the lower edge 430 a reach the projection 450 more reliably.

The protrusion 450 extends along the center position of the support portion 40 in the advancing/retreating direction AR of the intermediate mold support frame 301c to a position at a predetermined distance in the height direction H from the lower edge 430a of the shaft insertion hole 430, or along the center position. It is preferable to guide the flow of oil toward a region closer to the stationary platen 301a. This is to more reliably keep the flow of oil away from the molded article MP. The protrusion 450 of the present embodiment extends linearly along a plane perpendicular to the advancing/retreating direction AR at the center position of the support portion 40 to the outer peripheral surface of the annular portion 42 . The oil flow is guided along the central position of the support portion 40 until the However, the projection 450 may extend at least partially at an angle to a plane perpendicular to the advancing/retreating direction AR. Also, the protrusion 450 may extend in an at least partially curvilinear manner. By extending the protrusion 450 so as to approach the fixed platen 301a as it goes downward, it is possible to guide the oil flow toward the region closer to the fixed platen 301a than the central position. In this embodiment, the lower support inner wall 44a and the outer peripheral surface of the annular portion 42 are smoothly connected by a curved surface. Therefore, in FIG. 6, the boundary between the lower support inner wall 44a and the outer peripheral surface of the annular portion 42 is not drawn by a line.

The projection 450 of this embodiment starts from the lower edge of the inner wall 43a of the pivotal support. In other words, one end 450a of the protrusion 450 of the present embodiment protrudes along the height direction H from the inner end of the axial support lower wall 43b in the width direction W. As shown in FIG. Further, one end 450a of the projection 450 of this embodiment forms the same plane as the inner wall 43a of the shaft support. As a result, it is possible to allow oil to reach the protrusions 450 more reliably while reducing the risk of contact between the protrusions 450 and a member such as the intermediate die 22 disposed inside the intermediate die support frame 301c. However, the protrusion 450 may protrude inward in the width direction W from the inner wall 43a of the shaft support. Moreover, the projection 450 may contact the shaft insertion hole 430 or may start from the immediate vicinity of the shaft insertion hole 430 .

Further, the projection 450 of this embodiment extends to the lower support inner wall 44a along the pivot lower wall 43b. Therefore, the flow of oil that has reached the protrusion 450 can also be guided by the lower support inner wall 44a, and the flow of oil can be more reliably kept away from the molded article MP. The other end 450b of the projection 450 of this embodiment is provided in contact with the outer peripheral surface of the annular portion 42 . That is, in the present embodiment, the flow of oil is guided to the outer peripheral surface of the annular portion 42 .

Next, FIG. 7 is an explanatory diagram showing the effect of the protrusion 450 of FIG. 6 being provided. FIG. 7(a) shows the oil flow when the projection 450 is provided, and FIG. 7(b) shows the oil flow when the projection 450 is not provided. In FIG. 7, fats and oils are represented by shading.

As shown in (b) of FIG. 7, when the projection 450 is not provided, the oil flowing out from the shaft insertion hole 430 spreads from the lower edge 430a of the shaft insertion hole 430 to both sides in the advancing/retreating direction AR. As a result, the entire lower support inner wall 44a is wet with oil, making it easier for the molded article MP to come into contact with the oil.

On the other hand, as shown in FIG. 7(a), when the projections 450 are provided, the flow of oil is guided by the projections 450, and the portions of the lower support inner wall 44a wet with oil are limited. Therefore, contact of the molded product MP with oil is suppressed, and the need for removal of oil can be reduced.

A groove extending downward along the wall surface of the support portion 40 from the lower portion of the shaft insertion hole 430 may be provided instead of the protrusion 450 described above. Even with the groove, it may be possible to guide the flow of oil flowing out from the shaft insertion hole 430 in the same way as the projection 450 .

In such an injection molding machine 1, the contact suppressing means 45 prevents the molded product MP from coming into contact with oil flowing out from the shaft insertion hole 430, thereby reducing the need for removing the oil.

In addition, since the projection 450 or the groove extending downward along the wall surface of the support portion 40 from the lower portion of the shaft insertion hole 430 in the wall surface of the support portion 40 guides the flow of oil flowing out of the shaft insertion hole 430, the molded product MP is Contact with fats and oils can be suppressed more reliably.

Further, since the projection 450 or the groove is provided below the lower edge 430a of the shaft insertion hole 430 in the wall surface of the support portion 40, the oil flowing out from the shaft insertion hole 430 can more reliably reach the projection 450 or the groove. The projection 450 or the groove can more reliably guide the oil flow.

Also, the projection 450 or the groove extends along the central position of the support portion 40 in the advancing/retreating direction AR of the intermediate mold support frame 301c to a position at a predetermined distance in the height direction H from the lower edge 430a of the shaft insertion hole 430. Alternatively, since the flow of oil is guided toward the area closer to the fixed platen 301a than the central position, the flow of oil can be more reliably kept away from the molded product MP, and contact of the molded product MP with the oil can be ensured. can be suppressed to

In addition, the projection 450 or the groove starts from the lower edge of the shaft support inner wall 43a and extends along the shaft support bottom wall 43b to the lower support inner wall 44a. It is possible to keep them away from each other, and it is possible to more reliably prevent the molded product MP from coming into contact with oils and fats.

Embodiment 2.
FIG. 8 is a rear view (as viewed from the movable platen 301b side) showing the intermediate mold support frame 301c of the injection molding machine 1 according to Embodiment 2 of the present invention. The contact suppressing means 45 of the present embodiment includes a shielding member 451 that is arranged between the movable mold 21 and the support portion 40 and shields the oil flowing out from the shaft insertion hole 430 from the molded product MP. The shielding member 451 is shaped and arranged so as to shield the gap between the lower part of the shaft support part 43 and the movable mold 21 when the intermediate mold support frame 301c is viewed from the movable mold 21 side as shown in FIG. It is preferable to have

Although the configuration of the shielding member 451 is arbitrary, the shielding member 451 of the second embodiment includes a mounting portion 452 fixed to the support portion 40 above the shaft insertion hole 430 (rotating portion) at one end 452a side, and a mounting and a shield member main body 453 connected to the other end 452b side of the portion 452 and suspended by the mounting portion 452 . The mounting portion 452 and the shielding member main body 453 may be integrally formed with each other. The mounting portion 452 is a flat plate portion extending along a plane intersecting the extending surface of the shielding member main body 453, and can be fixed to the upper inner surface of the support portion 40 with a fastening member such as a bolt. However, the attachment portion 452 may be configured by another member such as a string-like member (rope or chain). The shielding member main body 453 may be a flat plate portion extending in the width direction W. As shown in FIG. It is preferable that the inner end 453a of the shielding member main body 453 is separated from the movable mold 21 in the width direction W. This is to avoid contact between the rotating movable mold 21 and the shielding member main body 453 . Since the shielding member main body 453 is suspended by the attachment portion 452, compared to the case where the shielding member main body 453 is attached to the lower portion of the shaft support portion 43, the rear surface of the shielding member main body 453 (the surface on the side of the movable platen 301b) is particularly attached to the axis. It is possible to reduce the possibility that grease from the insertion hole 430 may adhere. Moreover, by configuring the mounting portion 452 flexibly, damage to the shielding member main body 453 or the movable mold 21 can be suppressed even if the shielding member main body 453 comes into contact with the movable mold 21 . In a mode in which projections 450 or grooves are provided as in Embodiment 1, shielding members 451 may be further provided. Other configurations are the same as those of the first embodiment.

In such an injection molding machine 1, the shielding member 451 shields between the molded article MP and oil flowing out from the shaft insertion hole 430, so that the molded article MP can be more reliably prevented from coming into contact with the oil.

Moreover, since the shielding member main body 453 is suspended by the mounting portion 452, the risk of oil from the shaft insertion hole 430 adhering to the rear surface of the shielding member main body 453 can be reduced. In addition, even if the shielding member main body 453 should come into contact with the movable mold 21, damage to the shielding member main body 453 or the movable mold 21 can be suppressed.

In addition, in Embodiments 1 and 2, the rotating portion that rotatably supports the intermediate mold 22 with respect to the support portion 40 is configured by the shaft insertion hole 430 provided in the support portion 40 . However, the structure of the rotating part is arbitrary, and other structures such as a shaft body (rotating shaft) projecting from the supporting part and rotatably supporting the intermediate mold may be used. The shaft protruding from the support may be fixed with respect to the support. Moreover, in the case of such an aspect, the support portion may not be provided with the shaft insertion hole. Even in a mode in which the support portion is not provided with a shaft insertion hole, for example, oil from the intermediate mold may flow out from the shaft and adhere to the molded product. That is, the contact suppressing means of the present invention is useful even in a mode in which the support portion is not provided with the shaft insertion hole.

Reference Signs List 1: Injection molding machine 20: Fixed mold 21: Movable mold 22: Intermediate mold 220: Rotating shaft 301a: Fixed platen 301b: Movable platen 301c: Intermediate mold support frame 40: Support part 43: Axial support part 43a: Axis Support inner wall 43b: Shaft support bottom wall 430: Shaft insertion hole (rotating part)
430a: Lower edge 44: Lower support portion 44a: Lower support inner wall 45: Contact suppressing means 450: Protrusion 451: Shielding member 452: Mounting portion 453: Shielding member main body

Claims (7)

a stationary platen that supports the stationary mold;
a movable platen that supports the movable mold and is provided so as to move forward and backward with respect to the fixed platen;
an intermediate mold support frame disposed between the fixed platen and the movable platen, rotatably supporting the intermediate mold, and movable back and forth with respect to the fixed platen;
The intermediate mold support frame is
a pair of support portions spaced apart from each other in the width direction;
a rotating part that rotatably supports the intermediate mold with respect to the supporting part;
contact suppression means for suppressing contact of the molded product with oil flowing out from the rotating part,
Injection molding machine. The contact suppressing means includes a projection or groove that extends downward along the wall surface of the supporting portion from the lower portion of the rotating portion on the wall surface of the supporting portion and guides the flow of oil flowing out from the rotating portion.
The injection molding machine according to claim 1. The protrusion or groove is provided below the lower edge of the rotating part on the wall surface of the supporting part,
The injection molding machine according to claim 2. The projection or groove extends along the center position of the support portion in the advancing/retreating direction of the intermediate mold support frame to a position at a predetermined distance in the height direction from the lower edge of the rotating portion on the wall surface of the support portion. Or directing the flow of the oil toward a region closer to the stationary platen than the central position,
The injection molding machine according to claim 2 or 3. The support portion has a shaft support portion provided with the rotating portion and a lower support portion extending downward from the shaft support portion,
The shaft support portion has a shaft support inner wall arranged inside the lower support inner wall of the lower support portion in the width direction, and a shaft connecting a lower edge of the shaft support inner wall and an upper edge of the lower support inner wall. a support wall;
the projection or groove originating at the lower edge of the inner journal wall and extending along the lower journal wall to the inner lower support wall;
An injection molding machine according to any one of claims 2 to 4. The contact suppressing means includes a shielding member that is disposed between the movable mold and the support and shields between the molded product and the oil,
Injection molding machine according to any one of claims 1 to 5. The shielding member includes a mounting portion having one end fixed to the support above the rotating portion, and a shielding member main body connected to the other end of the mounting portion and suspended by the mounting portion,
The injection molding machine according to claim 6.

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