JPH045530B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a composite mold opening/closing device for a molding machine in which the mold is opened and closed by a crank, and the mold is clamped directly by a ram.

[Conventional technology]

Figure 6 shows a conventional toggle direct pressure type switchgear, in which a tie bar 3 spans a pair of fixed plates 1 and 2.
A movable platen 4 provided on one side and a ram 6 of a mold clamping cylinder 5 provided on one stationary platen 1 are connected to a toggle 7, and the toggle 7 is telescopically operated by a toggle cylinder 8 to fasten the mold 9. It opens and closes, and mold clamping and mold thickness adjustment are performed by operating a mold clamping cylinder.

[Problems to be Solved by the Invention] As is clear from the above structure, the conventional composite mold opening/closing device requires two drive devices: one for toggle operation and one for mold clamping and mold thickness adjustment. Also, since the number of control devices increases, there is a problem that the cost is higher than that of a normal mold opening/closing device.

This invention was devised to solve the problems of the above-mentioned conventional devices, and its purpose is to perform both high-speed mold opening/closing, mold clamping, and mold thickness adjustment using one drive device. The object of the present invention is to provide a new composite type switchgear that can reduce costs.

[Means for solving problems]

The present invention according to the above object includes movably disposing an intermediate plate having a crank and its stopper together with a movable plate on a tie bar spanning a pair of fixed plates, and connecting a connecting rod of the crank to the center of the back of the movable plate. A ram of a driving device attached to one fixed plate is connected to the intermediate plate, and a rotating device consisting of a rack and pinion is inserted into the intermediate plate from one fixed plate via a clutch to the rotating shaft of the crank. The purpose of this document is to provide the following information.

Further, the drive device according to the present invention can use either a hydraulic cylinder or an electric motor as a drive source.

[Effect]

In the above configuration, when the ram moves forward, the intermediate plate also moves forward together with the crank. Along with this movement, the pinion rotates on the rack, and together with the rotating shaft connected by the clutch, the crank also rotates until it contacts the stopper, thereby pushing out the connecting rod.

As a result, the movable platen moves forward toward the other fixed platen at high speed, and the connecting rod is brought into a straight and extended state. Furthermore, even after the crank stops, the movable platen is pushed by the ram via the intermediate plate, and the mold is completely closed there, and at the same time, the mold is strongly clamped by the ram.

To open the mold after molding, first the ram moves backward to force the mold to open, then the pinion rotates as the intermediate plate moves backward, causing the crank to return to its original position and pull the connecting rod back. As a result, the movable platen moves backward at high speed and the mold is opened.

Further, the present invention will be explained in detail with reference to illustrated examples.

〔Example〕

1 to 4 show an embodiment in which a hydraulic cylinder is used as the drive source, 11 and 12 are a pair of fixed plates on a machine base 14 connected by a tie bar 13, and 15 is moved to the tie bar 13. A movable plate is freely provided, and a mold 16 is placed on the movable plate 15 and the fixed plate 12.
is installed.

17 is an intermediate plate located between one fixed plate 11 and the movable plate 15 to which a hydraulic cylinder 18 is attached;
Similarly to the movable platen 15, it is movably provided on the tie bar 13.

This intermediate plate 17 has a crank 19 in the center, and a connecting rod 20 rotatably supported on the crank 19.
A rotation device 23 is provided on the rotation shaft 19a of the crank 19 via an electromagnetic clutch 22.

This rotating device 23 consists of a pinion 24 provided on the clutch shaft, and a rack 25 inserted from one stationary plate 11 to the intermediate plate 17. One end of the rack 25 is inserted through the stationary plate 11, and the shaft end Spring 27 applied between flange 25a and fixed plate 11
Therefore, it is always in pressure contact with the fixed platen 11.

The connecting rod 20 of the crank 19 is connected to the center of the back of the movable plate 15, and the intermediate plate 17 is connected to the ram 26 of the hydraulic cylinder 18, and the intermediate plate 17 and the crank 19 are operated by the ram 26. The movable platen 15 is designed to move forward and backward.

Next, the operation will be explained.

In the mold open state shown in FIG. 1, when the ram 26 of the hydraulic cylinder 18 is moved forward, the intermediate plate 17 is also moved forward. At this time, since one end of the rack 25 is pressed against the fixed plate 11, the pinion 24 rotates as the intermediate plate 17 moves. Further, since the shaft of the pinion 24 and the rotating shaft 19a are connected by the electromagnetic clutch 22, the crank 19 rotates and pushes out the connecting rod 20.

This rotation is caused by the movement of the intermediate plate 17 by the ram 26 until the crank 19 comes into contact with the stopper 21 provided in advance and stops, and since the linear movement is converted into rotational movement, the extrusion speed of the connecting rod 20 is , the moving speed of the ram 26 is increased, and the movable platen 15 moves toward the fixed platen 12 at high speed.

As a result, as shown in FIG. 2, the molds 16 attached to the fixed platen 12 and the movable platen 15 approach each other, and the connecting rod 20 extends straight on the axis of the ram 26.

When the intermediate plate 17 is further moved by the ram 26,
As shown in FIG. 3, the movable platen 15 is pushed through the connecting rod 20, the mold 16 is closed, and the pressing force from the ram 26 acts directly on the mold 16, resulting in strong mold clamping.

At this time, the crank 19 does not rotate any further due to the stopper 21, so the rotating shaft 19a also remains stopped, and the pinion 24 and rack 25 move forward by compressing the engaged spring 27.

Next, to open the mold, the ram 26 is moved backward in the mold closed state shown in FIG. Mold 16 is ram 2
6, the rack 25 is opened until one end touches the fixed platen 11 (see FIG. 2).

When the ram 26 further moves backward, the pinion 24 rotates due to the resistance of the rack 25, and the crank 19
rotates to its original position and pulls back the connecting rod 20.
As a result, the rotary plate 15 moves backward, and a high-speed mold opening occurs there (see FIG. 1).

Also, when adjusting the mold thickness when replacing the mold,
When the connecting rod 20 is in the state shown in FIG.
A and the pinion 24 side are separated, and the crank 19 is set in a free state. Thereafter, even if the intermediate plate 17 moves backward, the crank 19 does not rotate, and the movable plate 15 moves backward at the speed of the ram 26.

After replacing the mold, the ram 26 is moved forward again to close the mold, and the electromagnetic clutch 22 is input to connect the pinion 24 and the rotation shaft 19a, so that the crank 19 rotates. .

FIG. 4 shows an embodiment in which one end 25b of the crack 25 is fixed to the fixed platen 11. In this case, after high-speed mold closing, the electromagnetic clutch 22 is disconnected to free the crank 19, and the crank 19 is placed on top of it. Then move to mold clamping operation.

FIG. 5 shows a case where an electric motor 28 such as a servo motor is used as a drive source. In this case, the ram 26 is a ball screw shaft, and a rotating member 29 that moves the ram 26 back and forth in the axial direction is fitted into the fixed platen 11. hand,
It is rotated by gears 30 and 31. Note that 32 is an electromagnetic clutch for maintaining mold clamping force.

〔Effect of the invention〕

Since this invention can perform high-speed mold opening/closing, mold clamping, and mold thickness adjustment using one drive device, it can be manufactured at a lower cost than conventional ones, and it also uses a pinion as a crank rotation device. In addition to using a rack, by simply supporting the rack on one fixed plate and interposing a clutch between the rotating device and the crank, it is possible to combine the devices with the same drive device, making the device compact. It has the following characteristics.

[Brief explanation of drawings]

Figures 1 to 5 show an embodiment of the composite mold opening/closing device according to the present invention, in which Figure 1 is a longitudinal sectional front view of the main part when the mold is opened, and Figure 2 is a longitudinal sectional view of the main part when the mold is closed. Front view, Figure 3 is a longitudinal sectional front view of the main part when the mold is closed, Fig. 4 is a longitudinal sectional front view of the main part when the mold is closed in another embodiment, and Fig. 5 is the main part when an electric drive device is used. FIG. 6 is a partially vertical front view of a conventional composite type opening/closing device. 11, 12...Fixed plate, 13...Tie bar, 1
5...Movable plate, 16...Mold, 17...Intermediate plate,
18...Hydraulic cylinder, 19...Crank, 20
... Connecting rod, 21 ... Stopper, 22 ... Electromagnetic clutch, 23 ... Rotating device, 24 ... Pinion, 25 ... Rack, 26 ... Ram, 28 ... Electric motor.

Claims (1)

[Claims] 1 A movable plate and an intermediate plate having a crank and its stopper are movably provided on a tie bar spanning a pair of fixed plates, and the connecting rod of the crank is connected to the center of the back of the movable plate, and one of the plates is fixed to the intermediate plate. It is characterized by connecting the ram of a driving device attached to the plate, and providing a rotation device consisting of a rack and pinion inserted from one fixed plate into the intermediate plate via a clutch on the rotating shaft of the crank. A complex type switchgear.