JPH0139539Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Related Industrial Field) The present invention relates to an actuating device using a fluid pressure cylinder 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 5 and 6.
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 e is The pressure from the pressure medium supply section j, which is a separately provided pressure source, is increased or decreased by controlling the on-off control valve i, and the movable core plate c and the cavity movable plate b are connected to the movable core plate c side. It is designed to move towards and away from the fixed core plate a following the force.

(Problems to be solved by the invention) Since the hydraulic or pneumatic pressure for operating the mold is derived from another hydraulic pressure source such as a molding machine, the equipment cost for the molding machine increases, and There were problems, such as the need to disconnect and connect piping each time it was unloaded.

The present invention simplifies the mechanism by generating pressurized oil using a first cylinder to operate a mold such as a molding machine, and synchronously operating an intermediate plate via a second cylinder of the pressurized oil. This is what we are trying to achieve.

(Means for solving problems by invention) 3: Fixed side mold, intermediate plate, and movable side mold
In a plastic molding mold consisting of two molding members, the cylinder sides or piston rod sides of two hydraulic cylinders are fixed together to any one of the three molding members, and the two hydraulic cylinders are correspondingly fixed together. The piston rod side or cylinder side of the cylinder is fixed to the other two molded parts, and the rod side oil chamber of one of these two hydraulic cylinders and the anti-rod side oil chamber of the other hydraulic cylinder are mutually connected. They are connected by piping, and the movement of the movable mold generates hydraulic pressure in one hydraulic cylinder, and this hydraulic pressure is applied to the other hydraulic cylinder, causing the intermediate plate to operate in synchronization with the movement of the movable mold. I decided to do so.

(First Example) An example will be described with reference to FIGS. 1 and 2.
Reference numeral 1 designates a fixed side mold of a plastic molding machine, 2 a mold intermediate plate, and 3 a movable side mold. 4 is a guide pin for operating the intermediate plate 2, and 5 is a guide pin for operating the stationary mold 1 and the intermediate plate 2.

A first cylinder 6 is attached to the intermediate plate 2, and one end of a piston rod 7 having a piston 6a in the center is fixed to the movable mold 3 by a fixing part 8.

Reference numeral 9 denotes a second cylinder attached to the intermediate plate 2, which has the same dimensions as the first cylinder 6 in the figure. Similarly to the first cylinder 6, the second cylinder 9 also has a piston rod 10 having a piston 9a at its center, and one end of which is fixed to the stationary mold 1 by a fixing part 11.

12a is the rod side oil chamber of the second cylinder 9 and the first
Piping connecting the oil chamber on the anti-rod side of cylinder 6, 12b
Similarly, the piping connects the anti-rod side oil chamber of the first cylinder and the rod side oil chamber of the second cylinder.

(Function) When the movable mold 3 is moved to the left by the drive source as shown in Fig. 2 (arrow X), it pulls the piston rod 7 of the first cylinder 6 attached to the intermediate plate 2, and moves the piston 6a to the rod side. Hydraulic pressure is generated in the oil chamber, and this acts on the oil chamber on the side opposite to the rod of the second piston 9a of the second cylinder 9 via the pipe 12a. Then, since the end of the piston rod 10 is fixed to the stationary mold 1, the intermediate plate 2 is moved to the left along the guide pin 4. That is, the intermediate plate 2 also moves in synchronization with the movement of the movable mold 3, resulting in the state shown in FIG. In this case, since the first and second cylinders 6 and 9 have the same size, the intermediate plate 2 is positioned exactly between the movable mold 3 and the fixed mold 1.

Conversely, when the movable mold 3 moves to the right, the piston 6a of the first cylinder 6 moves through the piston rod 7.
Pressure oil is generated in the oil chamber on the opposite side of the rod, and this is transferred to piping 1.
2b to act on the rod-side oil chamber of the piston 9a of the second cylinder 9 attached to the intermediate plate 2. Then, since the piston rod 10 is fixed, the intermediate plate 2 moves to the right along the guide pin 5. In this case, the intermediate plate 2 also moves 1/2 of the amount of movement of the movable mold 3 in synchronization with the movable mold 3,
It is closed as shown in Figure 1.

(Second Embodiment) FIG. 3 shows a second embodiment. In this example, the first cylinder 6' is attached to the stationary mold 1, and one end of its piston rod 7' is fixed to the movable mold 3. A second cylinder 9' is also attached to the stationary mold 1, and a piston rod 10' is fixed to the intermediate plate 2. In this case, the diameter of the first cylinder 6' is approximately twice the diameter of the second cylinder 9'.

(Operation of the second embodiment) When the movable mold 3 moves to the right (arrow), pressure is generated in the oil chamber on the side opposite to the rod of the piston 6a', and this pressure acts on the oil chamber on the rod side of the piston 9a'. Therefore, the intermediate plate 2 is also connected to the movable mold 3 via the piston 9a'.
Move to the right by about 1/2 of the distance.

Conversely, pressure is generated in the rod-side oil chamber of the piston 6a' when the movable mold 3 moves to the left, and this acts on the oil chamber on the anti-rod side of the piston 9a' in the cylinder 9', moving the intermediate plate 2 to the movable side. Move about 1/2 of mold 3 to the left.

(Third Embodiment) FIG. 4 shows a third embodiment. In this example, the first cylinder 6'' is attached to the stationary mold 1, and one end of its piston rod 7'' is fixed to the movable mold 3. Further, the second cylinder 9'' is attached to the intermediate plate 2, and the piston rod 10'' is fixed to the movable mold 3. In this case, the diameter of the first cylinder 6'' is approximately twice the diameter of the second cylinder 9''.

When the movable mold 3 moves to the right (arrow), pressure is generated in the oil chamber on the side opposite to the rod of the piston 6a'', and this pressure acts on the oil chamber on the rod side of the piston 9a''. At this time, pressure acts on the rod-side oil chamber of the piston 9a'' and moves the intermediate plate 2 to the left, but since the piston 9a'' has already moved due to the movement of the movable mold 3, the intermediate plate 2 Move to the right by approximately 1/2 of the movement of the movable mold.

Conversely, when the movable mold 3 moves to the left, pressure is generated in the rod-side oil chamber of the piston 6a'', which is then transferred to the cylinder 9''.
It acts on the oil chamber on the anti-rod side of the inner piston 9a''.
Then, the intermediate plate 2 is moved to the left by about 1/2 of the amount of movement of the movable mold 3 via the piston 9a''.

(Effect) A first cylinder and a second cylinder are provided between the movable side mold, the intermediate plate, and the stationary side mold, and both chambers of the piston are connected by piping. Hydraulic pressure is generated in the cylinder, and the pressure oil generated by the first cylinder is applied to the second cylinder to operate the intermediate plate in synchronization with the movement of the movable mold, which eliminates the inconvenience of handling. Since no separate hydraulic power source is required, and no hydraulic piping from the hydraulic power source is required, operability is generally improved and the configuration is extremely simplified.

[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 second embodiment of the present invention. Figure 4 is also the third
Example. FIG. 5 shows a conventional multi-molding mold in a closed state. FIG. 6 is an explanatory diagram of the same opened state. In the figure: 1... Fixed side mold, 2... Intermediate plate, 3... Movable side die, 4, 5... Guide pin, 6... First cylinder, 6a, 6a', 6a''...
Piston, 7, 7', 7''... Piston rod, 8
...Fixed part (of the piston rod), 9, 9',
9''...second cylinder, 9a, 9a', 9a''...piston, 10...piston rod, 11...fixing part (of the piston rod), 12a, 12b...piping.

Claims (1)

[Scope of utility model registration request] In a plastic molding mold consisting of three molding members: a stationary mold 1, an intermediate plate 2, and a movable mold 3, one of these three molding members is attached to the cylinder side of two hydraulic cylinders or The piston rod sides are fixed together, and the piston rod sides or cylinder sides of the two hydraulic cylinders are correspondingly fixed to the sides of the other two molded parts, and the rod side oil of one of the two hydraulic cylinders is fixed. The chamber and the oil chamber on the anti-rod side of the other hydraulic cylinder are connected to each other by piping, and hydraulic pressure is generated in one hydraulic cylinder by the operation of the movable mold, and this hydraulic pressure is applied to the other hydraulic cylinder. An operating device for a plastic mold, characterized in that the intermediate plate is operated in synchronization with the movement of the movable mold.