JP4252562B2 - Sprue supply device for injection molding machine - Google Patents

Description

The present invention relates to a sprue supply device for an injection molding machine that supplies spouts simultaneously taken out from a molding die in a state separated from a molded product to an injection device.

Conventionally, as an injection molding machine provided with a recycled material recovery mechanism such as a sprue, those shown in Patent Document 1 and Patent Document 2 are known. In Patent Document 1 and Patent Document 2, a regenerated material 22 such as a sprue is carried out together with a molded product by a take-out machine 23 or the like, and the regenerated material 22 is dropped onto a receiving tray 20 or the like, and an injection device through a transport pipe 19 by an air flow. Sent to. However, the recycled material recovery mechanism 25 of Patent Literature 1 and Patent Literature 2 has the following problems. That is, in Patent Document 1 and Patent Document 2 , the disk substrate is fed while maintaining the vertical posture until it is taken out by the take-out machine 23 and delivered to another transfer machine. Therefore, when the take-out machine is stopped at the delivery position and the disk substrate is delivered to the transfer machine and then the sprue is to be dropped on the receiving tray, the disk substrate radius (6 cm) + the movement trajectory of the take-out machine are added. In addition, an interval (head) of at least about 8 cm is required between the tray and the tray. Therefore, there was a problem that the sprue that was dropped in the saucer or the inside of the saucer jumped and its posture was not stable. As a result, the sprue dropped last time and the sprue dropped next time were entangled, and the base of the saucer and the sprue collection tube were sometimes clogged.

  In Patent Document 1 and Patent Document 2, it may be possible to move the unloader to the vicinity of the upper part of the tray again after delivering the disk substrate to the transfer machine. However, an unloader that can perform complicated movement is required. In addition, there is a problem that the moving time of the unloader becomes longer. And especially when providing a saucer in a high position like patent document 1, it is necessary to make a take-out machine move more complicated, and when providing a saucer in a low position like patent document 2 (general case) However, it was necessary to rapidly raise the sprue by the force of strong air, and the sprue could not be stably sent to the injection device.

JP 2002-210779 A (Claim 1, 0010, FIG. 1) Japanese Patent Laying-Open No. 2004-17380 (Claims 5, 0022, 0023, FIG. 5)

In view of the above problems, an object of the present invention is to provide a sprue supply device for an injection molding machine that can stably supply sprues to an injection device via a recovery pipe. It is another object of the present invention to provide a sprue supply device for an injection molding machine that can quickly collect sprue using a conventional take-out machine without adopting a take-out machine having a complicated mechanism.

A sprue supply device for an injection molding machine according to claim 1 of the present invention is the sprue supply device for an injection molding machine that supplies the injection device with sprues that are simultaneously taken out from the molding die while being separated from the molded product . for movement locus of the take-out machine, the reflected output device side, inlet sprue recovery pipe for sending the sprue with air flow is provided toward the injection unit side, sprue sandwiched chuck portion of the take-out machine is opened And is collected by an air flow to the inlet .

The sprue supply device for an injection molding machine according to claim 2 of the present invention is that, in claim 1, the sprue collection tube is connected to the injection device through the reflection device side of the mold clamping drive device. Features.

The sprue supply device of the injection molding machine of the present invention is arranged on the reflection device side with respect to the movement trajectory of the take-out machine when the sprue is taken out by the take-out machine at the same time in a state separated from the molded product from the molding die. Since the inlet of the sprue recovery pipe for sending the sprue together with the air flow is provided toward the injection apparatus side , the sprue can be stably supplied to the injection apparatus via the recovery pipe.

  An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a plan view of a disk substrate molding machine provided with a sprue supply device according to this embodiment. 2 is a cross-sectional view taken along line AA in FIG. FIG. 3 is an enlarged view of a main part viewed from the direction of arrow B in FIG.

  As shown in FIG. 1, a disk substrate molding machine 11 for an optical disk substrate (hereinafter simply referred to as a disk substrate D) such as a CD or a DVD has an injection device 13 and a mold clamping device 14 provided on a bed 12. Yes. The injection device 13 is provided with a drive unit 15 having an injection motor and a metering motor (not shown) and a heating cylinder 16, and a nozzle 17 is provided at the tip of the heating cylinder 16. Further, a resin supply device 18 incorporating a feed screw for supplying unused pellet resin is attached to the heating cylinder 16, and a discharge port 21 of a sprue collection pipe 20 of the sprue supply device 19 is connected. In this embodiment, the outlet 21 of the sprue collection pipe 20 is directly connected to the resin inlet 22 of the heating cylinder 16, but a sprue pulverizer is provided between the outlet of the recovery pipe and the resin inlet of the heating cylinder. The sprue that has been conveyed may be divided into a plurality of pieces before being put into the heating cylinder.

  The mold clamping device 14 is provided with a fixed plate 24 to which the fixed mold 23 is attached, a movable plate 26 to which the movable die 25 is attached, and a pressure receiving plate 27, and 4 between the fixed plate 24 and the pressure receiving plate 27. A tie bar 28 is provided, and the movable plate 26 is slidably provided on the tie bar 28. The pressure receiving plate 27 is provided with a mold clamping drive device 29 for moving the movable plate 26 relative to the fixed plate 24 and opening and closing the fixed die 23 and the movable die 25. The mold clamping drive device 29 may be a hydraulic cylinder or a toggle mechanism using an electric motor.

  The molding die is composed of a fixed die 23 and a movable die 25, and a volume-variable cavity for molding the disk substrate D is formed when the two are matched. The fixed mold 23 is provided with a sprue or the like that is a passage when the mescutter and the molten resin are injected and filled, and a cavity surface is provided with a mirror plate (none of which is shown). The movable mold 25 includes a male cutter that performs gate cutting with the mescutter, a protruding pin that holds the sprue and protrudes, and an ejector that protrudes the disk substrate D, and is transferred to the disk substrate D on the cavity forming surface. The stamper to perform is arrange | positioned (all are not shown).

  In the present embodiment, an unloader 30 is disposed on the upper surface of the fixed platen 24. The take-out machine 30 carries out the completed disk substrate D and sprue S from the movable mold 25 to the delivery position G outside the tie bar 28 at the same time. The arm 31 can be swiveled by a predetermined angle and slightly moved in the mold opening / closing direction by the drive unit. As shown in FIGS. 2 and 3, a holding portion 32 that sucks and holds the disk substrate D is provided on the surface of the reflection device side E (see FIGS. 1 and 2) on the distal end side of the arm 31. A chuck portion 33 that holds the sprue S is provided on the surface of the injection device side F (see FIGS. 1 and 2). Note that both the holding unit 32 and the chuck unit 33 are operated by pneumatic control.

  Further, another transfer machine 34 is disposed on the side of the disk substrate forming machine 11 on the side where the take-out machine 30 is provided. The transfer machine 34 is configured to transfer the disk substrate D taken out by the take-out machine 30 to a cooling device (not shown) having an arm 35 having a multi-joint. The reason why the take-out machine 30 and the transfer machine 34 are provided separately is to shorten the time required for taking out the disk substrate D from the molding die and transferring it to the cooling device. It is also possible to simply make D and the sprue S move in parallel without changing the direction.

  As shown in FIGS. 1 to 3, on the side of the mold opening completion position of the movable mold 25, an injection port 36 of the sprue collection pipe 20 of the sprue supply device 19 that sends the sprue S together with the air flow H is an injection device. It is provided towards the side F. In addition, in relation to the unloader 30, the position of the insertion port 36 is provided in the vicinity of the reflection device side E with respect to the movement locus C (see FIG. 3) of the unloader 30 outside the tie bar 28. It has been. More specifically, the position of the insertion port 36 is a distance of 3 cm to 10 cm in which the arm 35 of the transfer machine 34 can be inserted from the holding part 32 of the unloader 30 stopped at the delivery position G of the disk substrate D. It is provided at a position on the reflection device side E with a gap facing the injection device side F.

  As shown in FIG. 2, the portion connected to the inlet 36 of the sprue collection pipe 20 is a straight pipe 20a, and the air of the pneumatic feeder is provided on the inner circumference (whole circumference) of the straight pipe 20a. A spout 37 is provided. The pneumatic feeder is connected to an air outlet 37 by a pipe line 38 via an air pressure source and a valve (not shown). The pipe 38 and the straight pipe 20a are connected to each other at such an angle that the air flow H sent from the pipe 38 is sent to the reflection device side E through the sprue collection pipe 20. Therefore, the air flow H sent from the air jet 37 to the straight tube 20a generates an air flow H toward the reflection device side E in the sprue collection tube 20, and the external air is converted into the air flow H ( Secondary air flow) is drawn from the inlet 36. The air sent from the air pressure source is preferably dry warm air that does not contain dust and the like. Further, the pneumatic feeding device may be provided in another portion of the sprue collection pipe 20 so that the speed of sending the sprue S to the injection device 13 together with the air flow H may be increased.

  As shown in FIG. 1, the straight tube 20 a of the sprue collection tube 20 is provided along the mold clamping device 14 toward the reflection device side E, and is connected to the curved tube 20 b in the vicinity of the mold clamping drive device 29. Is converted. The curved tube 20b is connected to the curved tube 20b via a straight tube 20a on the reflection device side of the mold clamping drive device 29, and the curved tube 20b is again parallel to the mold clamping device 14 to the injection device side F. The outlet 21 of the sprue collection pipe 20 is connected to the resin inlet 22 of the heating cylinder 16. That is, the sprue collection pipe 20 is disposed so as to surround the mold clamping drive device 29 and is connected to the injection device 13. The material of these sprue collection pipes 20 is not particularly limited, such as metal or resin, and the sprue collection pipe 20 may be attached to a shielding wall that shields the periphery of the mold clamping device 14 or fixed to a separately provided column. Also good. The sprue collection pipe 20 and the injection device 13 are connected so that only the sprue S is supplied so that the air flow H sent together with the sprue S does not affect the resin supplied to the heating cylinder 16. .

  Next, the operation of the sprue supply device 19 of the disk substrate molding machine 11 will be described. In the injection device 13, a resin such as polycarbonate is supplied from the resin supply device 18 to the heating cylinder 16 to be plasticized, and is injected and filled into the cavity of the molding die. Then, in the molding die, the male cutter (not shown) advances into the mescutter before the injection-filled molten resin is cooled and solidified to form a central opening S1 having a diameter of 15 mm. As shown in FIG. 3, the sprue S is formed by integrating the center opening S <b> 1 and a sprue S <b> 2 formed by a sprue as a passage provided in the fixed mold 23. The part has a length of about 35 mm and a diameter of about 2 mm to 3 mm. When the cooling and solidification of the disk substrate D is completed, release air is then ejected from the cavity forming surfaces of the fixed mold 23 and the movable mold 25, and the movable mold 25 is opened by the mold clamping drive device 29. The At that time, both the disk substrate D and the sprue S are held on the movable mold 25 side and are moved together with the movable mold 25 to a mold opening completion position.

  When the movable mold 25 is moved to the mold opening completion position, the arm 31 of the unloader 30 pivots to an extraction position near the mold opening completion position of the movable mold 25. The disk substrate D projected by the ejector is held by the holding portion 32 of the arm 31. Further, the sprue S projected by the projecting pin is sandwiched by the chuck portion 33 of the arm 31 with the center opening S1 facing the reflecting device side E. Then, the take-out machine 30 pivots again from the take-out position, and simultaneously moves the disk substrate D and the sprue S to the delivery position G. The disk substrate D is translated from the movable mold 25 to the delivery position G by the take-out machine 30, and is held in the vertical direction at the delivery position G as well as held by the movable mold 25. Then, another transfer machine 34 has moved to the reflection device side E at the delivery position G and is waiting, and the take-out machine 30 is slightly moved to the reflection device side E to transfer the disk substrate D to the transfer device. Delivered to 34. Next, the transfer machine 34 turns to transfer the disk substrate D to the cooling device.

  At substantially the same time as the transfer machine 34 holding the disk substrate D is moved, the valve of the pneumatic feeder is opened, and air of a predetermined pressure is reflected from the sprue collection pipe 20 through the air outlet 37 from the pipe line 38. The air is sent toward the ejection device side E, and air in the vicinity of the charging port 36 is sucked from the charging port 36. Slightly behind that timing, the chuck portion 33 of the unloader 30 releases the sprue S in which the sprue portion S2 is held in a horizontal state. However, the sprue S is sucked into the sprue collection pipe 20 from the charging port 36 together with the air flow H without falling because the air in the vicinity is sucked into the charging port 36 as the air flow H. The posture when separating the sprue S is such that the central opening S1 is parallel to the opening surface of the inlet 36 on the reflection device side E, and the air flow H acts on the central opening S1, thereby further increasing the air flow. It is in a state susceptible to the influence of the flow H. The sprue S introduced from the introduction port 36 is sent to the injection device side F through the curved tube 20b passing through the vicinity of the mold clamping drive device 29 together with the air flow H, and the resin is charged into the heating cylinder 16 from the discharge port 21. It is thrown into the mouth 22.

  In the above description, the reason why it is not convenient to provide the input port on the injection device side F of the take-out machine 30 will be briefly described. In the sprue S sandwiched by the chuck portion 33, the sprue portion S <b> 2 is sandwiched by the chuck portion 33, and the center opening S <b> 1 is located on the reflection device side E with respect to the chuck portion 33. Therefore, even if the air flow H is generated toward the injection device side F and the sprue S is separated from the chuck portion 33, the chuck portion 33 and the central opening S1 interfere with each other to send the sprue S to the injection device side F. I can't. Therefore, as in the present invention, the sprue S separated from the chuck portion 33 is sucked by the insertion port 36 provided at the position of the reflection device side E, and temporarily passes through the mold clamping drive device 29 side to the injection device side F. Sending to the most stable posture of the sprue S. Even when the conventional sprue is once dropped onto a tray or the like, the sprue of the present invention is formed by the sprue S being sent to the injection device side F once via the mold clamping drive device 29 side. The climbing gradient of the recovery pipe 20 can be relaxed or eliminated, and the sprue S can be stably sent to the injection device 13.

  In the above embodiment, the example in which the position where the sprue S is separated from the unloader 30 is the same position as the delivery position G of the disk substrate D has been described, but the position where the delivery position G and the sprue S are separated is a different position. There may be. Specifically, after the disk substrate D is delivered at the delivery position G, the sprue may be released at a position where the unloader 30 moves from the delivery position G along the movement locus C of the arm 31. However, in that case, the position where the sprue S is separated from the unloader 30 is a portion outside the space surrounded by the four tie bars 28, and even if the sprue collection pipe 20 is provided, it does not interfere with the mold opening and closing. Needless to say, it is the position and the moving position of the arm 31 where the molding cycle time is not extended.

  The sprue collection pipe 20 has been described as being connected to the same injection apparatus 13 through the reflection apparatus side of the mold clamping drive device 29. However, the sprue collection pipe 20 has a U-turn from a straight pipe provided toward the reflection apparatus side. Then, it may be connected to the injection device so as to pass through above or below the delivery position. Further, it may be connected to an injection device of another disk substrate molding machine.

  Next, another embodiment will be described. In this example, an air jet port of a pneumatic feeder is provided on the ejection device side of the arm of the unloader at the delivery position of the disk substrate in order to feed the sprue into the inlet of the sprue collection tube. The sprue collection port is provided on the arm reflection side as in the previous embodiment. The air flow ejected from the air ejection port is sent straight into the input port as it is. Therefore, the air flow ejected from the air ejection port mainly hits the central opening of the sprue (the surface formed by the fixed mold), so that the sprue is sent into the inlet. Accordingly, in the present invention, as in this alternative embodiment, the sprue may be introduced into the inlet of the sprue collection pipe by air feeding together with the air flow. In this alternative embodiment, it is preferable to use a pneumatic feeder in the sprue collection pipe.

  The present invention is not enumerated one by one, but is not limited to the one in the above-described embodiment, and it goes without saying that the present invention is applied to those modified by a person skilled in the art based on the gist of the present invention. It is.

It is a top view of the disc substrate molding machine provided with the sprue supply device in the present embodiment. It is sectional drawing in the AA line in FIG. It is the principal part enlarged view seen from the direction of arrow B in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Disc board | substrate molding machine 12 Bed 13 Injection apparatus 14 Clamping apparatus 15 Drive part 16 Heating cylinder 17 Nozzle 18 Resin supply apparatus 19 Sprue supply apparatus 20 Sprue collection pipe 20a Straight pipe 20b Curved pipe 21 Discharge port 22 Resin input port 23 Fixed metal Mold 24 Fixed plate 25 Movable mold 26 Movable plate 27 Pressure receiving plate 28 Tie bar 29 Clamping drive device 30 Unloader 31, 35 Arm 32 Holding portion 33 Chuck portion 34 Transfer machine 36 Input port 37 Air outlet 38 Pipe C Movement Trajectory D Disk substrate E Reflector side F Injector side G Delivery position H Air flow S Sprue S1 Center opening S2 Sprue

Claims (2)

In the sprue supply device of the injection molding machine that supplies the injection device with the sprue that is simultaneously taken out in a state separated from the molded product from the molding die ,
Relative moving locus of the take-out machine, the reflected output device side, inlet sprue recovery pipe for sending the sprue with air flow is provided toward the injection unit side, sprue sandwiched chuck portion of the take-out machine is opened A sprue supply device for an injection molding machine , wherein the sprue is collected by an air flow into the inlet . The sprue supply device for an injection molding machine according to claim 1 , wherein the sprue collection pipe passes through the reflection device side of the mold clamping drive device and is connected to the injection device.

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