JPH0224519Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an injection molding apparatus such as a die casting machine or an injection molding machine for plastics.

[Conventional technology]

Injection molding equipment, such as die casting machines and plastic injection molding machines, injects molten metal or molten resin into the cavity of a closed mold, waits for it to solidify and cool, and then opens the mold to remove the product. In the vicinity of the mold, a product ejection device and a spray device are installed to clean the inside of the mold cavity and apply a mold release agent to the inside of the mold cavity in preparation for the next injection after the product is taken out. There is.

4 and 5 are side and front views of a product take-out device and a spray device of a conventional die-casting machine, and show four tie rods 2 connecting a fixed platen 1 and a fixed platen on the opposite side (not shown). A movable platen 3 that moves forward and backward relative to the fixed platen 1 is supported by a mold clamping cylinder (not shown), and the fixed platen 1 and the movable platen 3 have a fixed mold 4 and a movable mold 5 facing each other. and each is fixed. Both molds 4 and 5 are provided with cavities 6 on both sides of the joint surface 7, into which molten metal is injected by an injection cylinder (not shown). Directly above the molds 4 and 5, a product take-out device 8 is supported by an arm 9, and diagonally above the molds 4 and 5, a spray device 10 is supported by a fixed platen 1. It is well established. Of these, the product take-out device 8 includes a pair of guide bars 13 that are slidably supported by a pair of guide pipes 11 and whose upper ends are connected by a connecting plate 12, and whose lower ends have a hand that can be opened and closed. 14 is installed. Also, guide pipe 1
A fluid pressure cylinder 16 is fixed to a bracket 15 that supports the piston rod 1.
The working end of 7 is connected to hand 14. On the other hand, the spray device 10 includes a four-bar link 19 pivotally connected to a bracket 18 on the fixed platen 1 side and a fluid pressure cylinder 20.
The working end of the piston rod 21 is pivotally connected to one end of the four-bar link 19. A spray head 22 is attached to the other end of the four-bar link 19 and is equipped with a plurality of nozzles that spray air and mold release agent.

With this configuration, when the movable mold 5 is opened by moving the movable platen 3 after injection of the molten metal into the cavity 6, solidification, and cooling, the piston rod 17 of the fluid pressure cylinder 16 is moved. After moving forward, the hand 14 descends to the position of the cavity 6 and grips the molded product in the cavity 6 by opening and closing, and then the hand 14 rises as the piston rod 17 retreats, and the entire device 8 moves to grasp the molded product. Eject outside the aircraft. On the other hand, at the same time as the hand 14 reaches its upper limit, the piston rod 21 of the fluid pressure cylinder 20 moves forward, and the link movement of the four-bar link 19 causes the spray head 22 to draw a trajectory as shown by the arrow in the figure, as shown in FIG. The piston rod 21 descends between the two molds 4 and 5 shown by the chain line, and after spraying and applying a mold release agent into the cavity 6, returns to the position shown in FIG. 4 by retracting the piston rod 21. After that, the mold is clamped and the above operation is repeated.

[Problem that the invention attempts to solve]

However, in the conventional device configured as described above, if the spray head 22 of the spray device 10 starts to descend before the hand 14 of the product take-out device 8 is raised, the hand 14 and the spray head 22 will interfere with each other. , the spray head 2 must be removed only after the hand 14 has been fully raised.
There was a problem in that the advance of step 2 could not be started, which caused the molding cycle to be extended and productivity to be reduced.

On the other hand, there are systems in which a hand and a spray head are arranged in one support device, as disclosed in Japanese Utility Model Application Publication No. 181470/1982 and Japanese Patent Application Publication No. 116113/1989.

However, since both of these have the hand and spray head attached to a single support member,
Not only is it impossible to shorten the cycle time because the hand cannot be moved outside the machine during spraying, but also because the hand is in a close position during spraying. There is a problem in that the released mold release agent adheres to the molded product held by hand. Also,
In both cases, the support device is installed on the side of the molding machine, and the hand and spray head are inserted and removed from the side, so there is a problem that the space occupied by the machine including the operating space becomes large. Since a movable arm or link is used, there is a problem with rigidity, and there is also the problem that it is difficult to apply it particularly to large-sized molding machines.

[Means for solving problems]

In order to solve such problems, this invention
The first cylinder moves up and down between the two upper tie rods and stops at three positions: the upper limit position above the upper tie rod height, the lower limit position below the mold, and the spray position corresponding to the mold. A spray device equipped with a spray head, and a second cylinder that moves up and down approximately coaxially with the spray head between the upper two tie rods to reach the upper limit position of the spray head above the upper limit position of the spray head and the mold. A lower limit position for gripping the molded product and a product take-out device equipped with a hand that stops at the lower limit position corresponding to the molded product are respectively provided on the fixed plate.
The hand of the product take-out device is movable up and down at the end of the frame that moves horizontally from above the height of the upper tie rod to one side of the injection molding device, and the spray head of the spray device is installed at the height of the upper tie rod. It is provided at the rotating end of the arm that is above the horizontal position and rotates horizontally from the lower side of the hand to the other side.

[Effect]

After opening the mold, the spray head and hand move down almost simultaneously through the upper tie rods, the spray head passes between the molds and stops below them, and the hand stops at a position corresponding to the mold. Grip the molded product. After gripping the molded product, the hand and the spray head start to rise almost simultaneously, and the hand rises to the upper limit position, then moves to one side and discharges the molded product out of the machine. On the other hand, the spray head temporarily stops at a position corresponding to the mold during its upward stroke and sprays. After that, it rises to the upper limit position and rotates to the other side of the aircraft.

〔Example〕

1 to 3 show an example in which the injection molding apparatus according to the present invention is applied to a die-casting machine.
The figure is a partially cutaway side view of a product take-out device and a spray device of a horizontal clamp die-casting machine to which this is applied, FIG. 2 is a front view, and FIG. 3 is a plan view. In these figures, the die-casting machine 30 has a fixed platen 3 fixed on the machine base.
1 and a fixed plate on the opposite side (not shown) which is connected to the fixed plate 31 by four tie rods 32 and fixed on the machine base, and the fixed plate 31 has a fixed mold 33. It is installed. Also,
The tie rod 32 supports a movable platen (not shown) that moves forward and backward with a mold clamping cylinder, and a movable mold 34 facing the fixed mold 33 is mounted on this movable platen. Reference numeral 35 denotes a cavity which is formed separately between the two molds 33 and 34 and into which the molten metal is injected. In addition, in FIG. 1, the movable mold 34 is the fixed mold 3.
It shows the mold open state moving away from 3.

On the upper surface of the fixed platen 31, a rotating bearing stand 36, which is formed in a substantially inverted U-shape in side view, is fixed and positioned closer to one of the tie rods 32 than the center of the fixed platen 31 in FIG. This rotation bearing stand 3
An arm shaft 37 is rotatably supported by bearing parts 36a and 36b formed on the upper and lower sides of the arm 6 via a ball bearing 38. This arm shaft 37
The arm 3 has an almost S-shaped shape when viewed from the side.
9 is fitted with base end boss portions 39a and 39b and is supported rotatably in the horizontal direction, and a pinion 40 is pivotally mounted between the upper and lower boss portions 39a and 39b. Reference numeral 41 denotes a rack that is slidably supported by the U-shaped portion of the rotation bearing pedestal 36 and meshes with the pinion 40, and is fixed to the piston rod of a rack cylinder 42 fixed to the rotation bearing pedestal 36. ,
The pinion 40 moves forward and backward together with the piston rod using fluid pressure, and the pinion 40 is rotated, so that the arm 39 is rotated between a position perpendicular to the tie rod 32 shown by a chain line in FIG. 3 and a position parallel to the tie rod 32 shown by a solid line in FIG. It is configured. A spray support stand 44 having a hollow rectangular cross section and provided in the spray device 43 is fitted into a square hole 39c formed at the tip of the arm 39 so as to be movable up and down. is a first cylinder 47 which functions to raise and lower the spray, the working end of the piston rod 45 being fixed to the projecting piece 46 of the spray support base 44.
is installed. From the lower end of the spray support stand 44, the spray head arm 48 is connected to the arm 39.
Attached to the lower surface of the spray head arm 48 is an inverted U-shaped spray head 49 equipped with a plurality of nozzles that eject air and mold release agent. Reference numeral 50 denotes a cover that connects the plate 51 at the upper end of the spray support stand 44 and the protrusion 46 and covers the spray lifting cylinder 47. In addition, air and mold release agent piping for the spray head 49 and cylinders 42 and 47 are also provided.
The fluid pressure piping etc. for each cylinder described later are as follows.
A support stand 52 protrudes upward from the bearing portion 36a.
Piping is provided via an upper piping unit (not shown), a piping unit 53 attached to the plate 51, and a valve unit 54 attached to the cover 50. As the piston rod 45 advances and retreats, the spray head 49 moves between the upper tie rods 32 and 32, indicated by the reference numeral 49 in the figure, to the upper limit position of the upper tie rod, and to the mold 3, indicated by the reference numeral 49A.
It is configured to move up and down between the lower limit position below 3 and 34, and to stop at a position corresponding to the molds 33 and 34, indicated by reference numeral 49B in the figure, for spraying during the ascent. The lower limit position of the spray head 49 is regulated by a limit switch or the like, but the upper limit position and the spray position are regulated by a stopper device to be described below. That is, a stopper cylinder 55 is attached to the lower surface of the tip of the arm 39, and a stopper 56 is fixed to the piston rod thereof, and a stopper cylinder 56 is attached to the side surface of the spray support base 44 when the piston rod moves forward. A pair of upper and lower engagement pieces 57 and 58 that engage with the engagement piece 56 are fixed. When the stopper 56 engages with the upper engagement piece 57, the spray head 49 stops at the upper limit position indicated by reference numeral 49, and when the stopper 56 engages with the lower engagement piece 57, the spray head 49 stops.
stops at a position corresponding to the mold indicated by reference numeral 49B. When stopping, the stopper cylinder 55 operates at a position where the engagement piece 57 is slightly raised from the stop position, and at the same time, the pressure fluid to the lifting cylinder 47 is released, and the spray support base 44 is lowered by its own weight, and the stopper cylinder 55 is activated. It is configured to stop at 56.

On the other hand, in the center of the fixed platen 31 in the width direction, there is disposed a frame 59 that is rotatable in the horizontal direction about a point indicated by the symbol P in FIG. 3 and is supported by a support member (not shown). It is configured to rotate between a position parallel to the tie rod 32, indicated by a chain line L in FIG. 3, and a position removed from the molds 33, 34, indicated by a chain line _L1 . A product ejecting device, generally designated by reference numeral 61, is supported by a support stand 60 fixed on the frame 59 so that it can be adjusted forward and backward in the mold opening/closing direction by fitting its horizontal member 62. There is. The product take-out device 61 includes a pair of vertical guide pipes 63 located almost directly above the spray head 49 and fixed to a horizontal member 62. Each guide pipe 63 is connected at its upper end with a plate 64. The guide bars 65 are fitted and supported so as to be vertically movable. Further, an elevating cylinder 66 serving as a second cylinder is fixed upright to the connecting member of the guide pipe 63 so as to be located between the guide bars 65 and parallel thereto.
Reference numeral 67 is a hand for grasping a molded product formed to be openable and closable, and is attached to the lower end of the guide bar 65. This hand 67 is equipped with a piston rod 68 which is advanced by the fluid pressure of the lifting cylinder 66. The working end is fixed. With this configuration, when the piston rod 68 of the elevating cylinder 66 advances or retreats, the hand 67 sets the upper limit position higher than the upper limit position of the spray head 49, and moves the hand 67 to a position corresponding to the molds 33, 34. Move up and down using the lowering limit position. In addition, the spray head 49
The timing of raising and lowering the hand 67 and the hand 67 is set as follows. That is, the spray head 49 and the hand 67 begin to descend almost simultaneously from their upper limit positions shown in FIG.
9 passes through the molds 33 and 34 and passes through the molds 33 and 34.
The hand 67 stops at a position indicated by the symbol 49A below, and the hand 67 also stops at a position corresponding to the molds 33 and 34. Then, when the hand 67 grasps the molded product and starts to rise, the spray head 49A also starts to rise at the same time, and the molds 33 and 3 indicated by reference numeral 49B
It stops at the position corresponding to 4 and sprays, but
During this time, the hand 67 continues to rise and stops at the upper limit position. Spray head 4 after spraying
9B rises to the upper limit position indicated by reference numeral 49 in FIG. 2, thereby completing one cycle.

The operation of the die casting machine configured as above will be explained. The molten metal is injected into the cavity 35 of the clamped molds 33 and 34, and the molten metal is solidified and cooled before being opened. At this time, the molded product is held on the movable mold 34 side by the action of an ejector (not shown). Therefore, when the two elevating cylinders 47 and 66 are operated simultaneously to advance the piston rods 45 and 68 from the state shown in the figure, the spray head 49 is lowered and the hand 67 is also lowered accordingly. After passing the molds 33 and 34, the spray head 49 is stopped at the lower limit position 49A by the limit switch, and the hand 67 is activated by the limit switch to move the molds 33 and
It stops at the position corresponding to 34. If the hand 67 is opened and closed and the extrusion device (not shown) extrudes the molded product from the movable mold 34 in a timely manner, the molded product is gripped by the hand 67.
Both lifting cylinders 47 and 66 are operated simultaneously to start raising the spray head 49A and hand 67. The spray head 49A is connected to the molds 33 and 34.
When the upper engaging piece 57 rises slightly after responding to It descends slightly due to its own weight and is stopped by engagement between the stopper 56 and the engaging piece 57.
This allows the spray head 49 to move into the molds 33, 3.
Since it stops at the position indicated by the reference numeral 49B, which correctly corresponds to No. 4, air and mold release agent are jetted out to clean the inside of the cavity 35 and apply the mold release agent. The hand 67 continues to rise even while the spray head 49 is stopped, and when it reaches the upper limit position shown in the figure, it is stopped by a limit switch. After spraying is completed, the elevating cylinder 47 operates again and the piston rod 45 retreats, so that the spray head 49B rises, and when it reaches the upper limit and rises slightly, the lower engagement piece 58 passes the stopper 56. When the pressure fluid in the lifting cylinder 47 is released and at the same time the stopper 56 is moved forward by the stopper cylinder 55,
The spray support base 44 is slightly lowered by its own weight and properly stopped at the upper limit position by engagement between the stopper 56 and the engagement piece 58. Prior to this lifting of the spray head 49, the hand 67, which grips the molded product and stops at the upper limit position, rotates the frame 59 to a position centered on the chain line _L1 in FIG.
Since it is located outside the machine, the hand 67 is opened and closed to release the molded product outside the machine. Furthermore, when the rack 41 is moved forward together with the piston rod of the rack cylinder 42, the pinion 40 rotates clockwise in FIG. vacate the position. This makes it possible to avoid interference with, for example, a core cylinder (not shown) located above the molds 33, 34.

As explained above, the spray head 49 of the spray device 43 and the hand 67 of the product removal device 61
Since both are lowered and raised at the same time, the cycle time is significantly shortened compared to conventional devices that lower and raise separately at staggered timings.
In this embodiment, the stopper 56 and the locking pieces 57, 58 are provided to restrict the stop position of the spray head 49 between the upper limit position and the mold corresponding position, so that the position accuracy is improved. do. Furthermore, since the spray head 49 and the hand 67 are configured to be removable from a position above the mold, interference with the core cylinder and the like can be avoided.

Although this embodiment shows an example in which the present invention is applied to a die-casting machine, it can be similarly applied to a plastic injection molding machine.

[Effect of idea]

As explained above, according to the present invention, in an injection molding apparatus, a spray device having a spray head and a product take-out device having a hand are respectively provided on the fixed plate, and the spray head and the hand are connected to the first cylinder. and a second cylinder, the upper two tie rods are raised and lowered on a substantially coaxial line, and these are moved to one side and the other side of the injection molding apparatus at a position above the height of the upper tie rod. Since it has a rotating structure, not only the area occupied by the machine is reduced, but also the hand can be operated independently even during spraying, thereby shortening the molding cycle time. Furthermore, since the hand holding the molded product can be moved far away during spraying, there is no possibility that the mold release agent will adhere to the molded product after molding. Furthermore, since the spray device and the product take-out device are each mounted on a fixed platen, and the spray head and hand are raised and lowered in close proximity to the mold, the support members can be made shorter, maintaining rigidity. Another advantage is that it is easy to use and can be applied to large injection molding machines.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the injection molding apparatus according to the present invention. 3 is a plan view, FIG. 4 is a side view of a spray device of a conventional die-casting machine, and FIG. 5 is a front view of a product take-out device and a spray device. 30... Die casting machine, 33... Fixed mold, 34... Movable mold, 43... Spray device,
47... Lifting cylinder, 49... Spray head, 61... Product take-out device, 66... Lifting cylinder, 67... Hand.

Claims (1)

[Scope of utility model registration request] The first cylinder moves up and down between the two upper tie rods and stops at three positions: the upper limit position above the upper tie rod height, the lower limit position below the mold, and the spray position corresponding to the mold. A spray device 43 equipped with a spray head 49 and a second cylinder move the spray head 49 up and down approximately coaxially with the spray head between the upper two tie rods to reach the upper limit position above the upper limit position of the spray head. and a product take-out device 61 equipped with a hand 67 that stops at the lower limit position for gripping the molded product corresponding to the mold, respectively, are provided on the fixed platen 31, and the hand 67 of the product take-out device is attached to the upper limit position. The spray head 49 of the spray device is provided at the end of a frame 59 that moves horizontally from above the height of the tie rod to one side of the injection molding apparatus so as to be able to rise and fall, and the spray head 49 of the spray device is above the height of the upper tie rod. An injection molding apparatus characterized in that it is provided at a rotating end of an arm 48 that rotates horizontally from the lower side of the hand 67 to the other side.