JPH0133295Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Related Industrial Field) The present invention relates to a novel actuating device for a plastic mold.

(Prior Art) It is very common to operate a mold using a hydraulic cylinder.

For example, Japanese Utility Model Application Publication No. 58-48413 discloses a multiple molding mold using a cylinder device. This will be briefly explained with reference to Figures 3 and 4.
In the multiple molding mold, a fixed core plate a, a cavity movable plate b, and a movable core plate c are arranged side by side so as to be able to move toward and away from each other. The cavity movable core plate b moves toward and away from the fixed core plate a. A first piston rod b that can reciprocate toward the fixed core plate a and a second piston rod g that can reciprocate toward the movable core plate c are installed in the same cylinder chamber e in the cavity movable plate b. An internal cylinder device h is provided, a first piston rod f of this cylinder device h is connected to a fixed core plate a, a second piston rod g is connected to a movable core plate c, and the fluid pressure in the cylinder chamber is separately controlled. The pressure from the pressure medium supply part j, which is the provided pressure source, is increased or decreased by controlling the on-off control valve i, and each movable core plate c and cavity movable plate b is subjected to the force from the movable core plate c side. Following this, the fixed core plate a is moved toward and away from the fixed core plate a.

(Problems to be solved by the invention) Because the hydraulic or pneumatic pressure for operating the mold is derived from other hydraulic power sources such as the molding machine, equipment costs for the molding machine increase and it is difficult to load and unload the mold. There were problems such as the need to disconnect and connect piping every time.

The present invention aims to simplify the mechanism by opening and closing the intermediate plate using pressure oil generated by the mold operation of the molding machine, and by using such a hydraulic mechanism, the intermediate plate can be opened and closed with a time lag. The aim is to provide a mechanism that can operate the system.

(Means for solving problems by invention) The method includes a fixed side mold, a movable side mold, and an intermediate plate provided between these, a first cylinder is attached to the fixed side mold, and the first cylinder is The piston rod in the cylinder is slidably attached to a guide block attached to the movable mold, and when the mold is closed, the stopper at the tip of the piston rod protrudes a predetermined distance from the guide block, while the fixed mold Further, another second cylinder is attached to the cylinder, the tip of the piston rod of the second cylinder is fixed to the intermediate plate, and the left oil chamber of the first cylinder and the right oil chamber of the second cylinder are connected to the first cylinder. The right oil chamber of the first cylinder and the right oil chamber of the second cylinder are connected by piping, respectively.

(Embodiment of the invention) An embodiment will be described with reference to FIGS. 1 and 2.
In FIGS. 1 and 2, 1 is a stationary mold in a plastic molding apparatus, and 2 is a stripper plate or carrier located between a movable mold 3 and a fixed mold 1. This is an intermediate plate such as a bitty plate. 4 is a guide pin of the intermediate plate 2, which is fixed to the stationary mold 1. Reference numeral 5 denotes a fixed cylinder installed on or inside the fixed mold 1, and the intermediate plate 2 is fixed to the end of the piston rod 6 of the cylinder.

8 is also a fixed cylinder installed on the fixed mold 1 or inside the mold, and the piston rod 9 of the cylinder 8 is connected to the guide block 1 attached to the movable mold 3.
0. Stoppers 9a and 9b are fixed to the tip and middle of the piston rod 9, and when the stoppers hit the guide block 10, the movable mold 3 and the piston rod 9 move as one. As is clear from FIG. 1, when the movable mold 3 is closed as shown in FIG. 1, the piston rod 9 protrudes from the guide block 10 by a distance A, that is, the delay in the operation of the intermediate plate 2. A pipe 7a connects the left oil chamber of the piston 5a of the cylinder 5 and a right oil chamber of the piston 8a of the cylinder 8, and a pipe 7b connects the right oil chamber of the piston 5a and the left oil chamber of the piston 8a. Although the cylinders 5 and 8 have been described as being fixed to the mold 1, it goes without saying that either one may be provided at a position apart from the mold 1.

(Operation) The movable mold 3 is moved to the first position by the platen of the molding machine.
When it is pulled open from the state shown in the figure to the left side of the figure, only the movable mold 3 moves in the section of distance A, and then moves a distance A corresponding to the delay in the operation of the intermediate plate 2, and the guide block 10 hits the stopper 9a. Then, the movable mold 3 and the piston rod 9 move as one to the left in the figure.

Then, via the piston rod 9, the cylinder 8
The piston 8a inside generates hydraulic pressure in the left oil chamber of the piston 8a. The hydraulic pressure generated here is guided to the right oil chamber of the piston 5a of the cylinder 5 via the pipe 7b. Then, the piston 5a is pushed to the left, and the stripper plate 2 is actuated to the left via the piston rod 6, thereby dropping the molded product. Similarly, the reverse case also works.

By changing the cylinder diameters of the cylinders 5 and 8, the operating force, speed, and stroke of the piston rod 6 can be changed depending on the purpose. Furthermore, there is no restriction on incorporating general hydraulic control equipment. Furthermore, the number of hydraulic pressure generating cylinders and operating cylinders is not limited.
Can be combined arbitrarily.

(Effect) A hydraulic or pneumatic cylinder, etc. is operated using the operation of a molding machine, and the hydraulic or pneumatic cylinder generated thereby is used to operate a hydraulic or pneumatic cylinder for operating an intermediate plate such as a stripper plate. Therefore, there is no need for a hydraulic source that is particularly troublesome to handle and manage, and there is no need for hydraulic piping from the hydraulic source, which further improves operability and greatly simplifies the configuration.

Furthermore, the piston rod of the cylinder attached to the stationary mold was made to protrude a distance A from the guide block of the movable mold when the mold was closed, so that only the movable mold operated during this distance. It is now possible to reliably cause a separate intermediate plate, such as a stripper plate, to operate as desired with respect to the movable side mold with a time lag.

[Brief explanation of the drawing]

FIG. 1 shows a mold according to the present invention in a closed state. FIG. 2 also shows the mold in an open state. FIG. 3 shows a conventional multi-molding mold in a closed state.
FIG. 4 is an explanatory diagram of the same opened state. In the figure, 1... Fixed side mold, 2... Stripper plate, 3... Movable side die, 4... Guide pin, 5... Fixed cylinder, 5a... Piston,
6... Piston rod, 7a, 7b... Piping, 8
... Fixed cylinder, 8a ... Piston, 9 ... Piston rod, 9a ... Stopper, 10 ... Guide block.

Claims (1)

[Scope of utility model registration request] It comprises a fixed mold 1, a movable mold 3, and an intermediate plate 2 provided between them. A first cylinder 8 is attached to the fixed mold 3, and the inside of the first cylinder 8 is The piston rod 9 is slidably attached to a guide block 10 attached to the movable mold, and when the mold is closed, the stopper 9a at the tip of the piston rod is a predetermined distance A from the guide block 10.
On the other hand, another second cylinder 5 is attached to the stationary mold 1, the tip of the piston rod 6 of the second cylinder 5 is fixed to the intermediate plate 2, and the first cylinder 8 is The left oil chamber of the second cylinder 5 and the right oil chamber of the second cylinder 5 are connected by piping, and the right oil chamber of the first cylinder 8 and the right oil chamber of the second cylinder 5 are connected by piping. Mold actuation device.