JPS5976234A - Vertical die clamper - Google Patents

Abstract

PURPOSE:To form the titled vertical die clamper of low height, by arranging a die clamping cylinder, a piston, etc. beside a fuselage, and providing a controlling means for the retreating position of a die clamping plate at an upper stationary plate. CONSTITUTION:Under the condition that the stationary member 16 of a die clamping plate 8 can be inserted into the rotary member 20 of a controlling mechanism 17, pressure oil is supplied to an oil chamber 3b by opening a prefill valve 4 to move a die clamping piston 3 upwards at a high speed. Hence, the die clamping plate 8 is raised to form a space for attaching a metal die between the die clamping plate 8 and a base disc 1. Thereafter, a metal die is provided therein, oil resistance in the oil chamber 3b is released, pressure oil is supplied to another oil chamber 3c, and die clamping is performed by lowering the die clamping plate 8 together with the piston 3. Thereafter, the rotary member 20 is rotated by a predetermined angle with a rotary actuator 22 to make the insertion of the stationary member 16 into said interior impossible, and then die clamping is performed by closing the prefill valve 4 and supplying pressure oil to an upper chamber 2a.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vertical mold clamping device used for injection foam molding, compression molding, or the like.

In the injection foaming or compression molding method, in which molten (FI3) resin is injected and filled into a closed mold, and then the closing position of the mold is changed to expand or compress the molten resin, the mold is closed. There is a need for a means for changing the position in two stages.This means for changing the closed position can either detect the closed position of the movable plate and hydraulically block it to control the mold position during injection and filling;
Alternatively, a method of mechanically controlling the mold position is adopted. Among the conventional methods mentioned above, when using a hydraulic block, high pressure is not applied during injection and the mold position is unstable, making it difficult to perform highly accurate molding. The drawback was that it was difficult to implement.

As for the mechanical means of twisting, there is a technology in which a wedge is provided at the joint of the mold to determine the closing position, and control is performed by varying the pushing amount of the wedge (see Japanese Patent Publication No. 55-6054).
and a technique in which a movable plate cylinder is provided in addition to the mold clamping cylinder, and antibacterial control is carried out using its stroke ring and rondo (see Japanese Patent Publication No. 7860/1986).
There is.

The control means using sea urchins has problems in that the mold structure is more complicated than that of a normal mold because cylinders for moving the sea urchins and wedges are provided in the mold, and it lacks versatility.

In addition, control using a stop cylinder and a rond requires a stop grate and an electric motor to adjust the position of the rond passing through the stop cylinder, which not only complicates the structure around the mold clamping cylinder but also has the disadvantage of being expensive. .

Therefore, we invented a mold clamping device (Japanese Patent Application No. 113306/1982) which eliminates the above-mentioned drawbacks of the conventional method. However, the mold clamping device fVi disclosed therein performs mold clamping by pressing the mold clamping plate from the back, and a device for controlling the retreating position of the mold clamping plate is installed between the mold clamping cylinder and the mold clamping plate. Because of this provision, if the mold clamping device is applied to a vertical mold clamping device, the mold clamping cylinder will be located at the top, resulting in a disadvantage that the hydraulic piping will be long. 1.A new problem arises in that not only does it take time and effort to deal with oil leakage and maintenance, but it is also structurally difficult to open and close the mold at high speed. The present invention aims to provide a new mold clamping device that is vertical but has a low height and can perform foam molding and compression molding by controlling the retracted position of the mold clamping plate.

The present invention has a plurality of vertical mold clamping cylinders provided on the side of a base plate, a mold clamping piston that protrudes upward from the base plate and also functions as a high-speed opening/closing cylinder, and a penetrating piston inserted into each of the mold clamping pistons. A control mechanism having a rotating member provided in the center of the fixing plate, and a fixing member installed on the top of the clamping plate, on a fixing plate connected and held to the tie rod whose lower end is fixed and the upper end of the mold clamping piston. and a mold clamping plate retraction position control device.

The present invention will be explained in detail below using illustrated examples.

Reference numeral 1 denotes a base plate, and a plurality of mold clamping cylinders 2, 2 are provided in the vertical direction on the side thereof. The mold clamping cylinders 2 and 2 have a base plate 1 and p
Clamping pistons 3, 3 of a required length are provided that protrude upward, and the upper chamber 2a of the clamping cylinder 2゜2 is connected to a flow path 5 that is opened and closed by a hydraulically operated prefill valve 4. .

The mold clamping pistons 3, 3 are formed with a hollow piston rod 3a which also serves as a high-speed opening/closing cylinder, and a tie rod 6.6 having an axis longer than the mold clamping piston 3.3 is inserted through the piston rod 3a.

The lower end of this tie rod 6.6 is fixed to the mold clamping cylinder 2°2, and the part located inside the mold clamping pistons 3, 3 has two oil chambers 3b, 3c inside the mold clamping cylinder. A piston head 7 for partitioning and a plurality of hydraulic passages communicating with the oil chambers are provided0.Moreover, a mold clamping plate 8 is fitted into the upper end of the mold clamping pistons 3,3, and They are integrally connected by members 9, 9. A hydraulic cylinder lO and a piston 11 are installed inside the center of the mold clamping plate 8, and the piston 1
Upper protruding bottle 1 through the grate 12 in the recess at the lower end of 1
3 is installation.

Reference numeral 14 denotes a fixing plate which is connected and held to the upper end of the tie rod 6.6 by means of nut members 15, 15.

At the center of this fixing plate 14, together with a fixing member 16 of a required length attached to the upper center of the mold clamping plate 8, a mechanism 17 for controlling the retracted position of the mold clamping plate 8 is provided so as to be rotatable and movable up and down. It is.

This control mechanism 17 includes a main body 19 fitted into a mounting hole provided in a fixed plate 14 using a key 18 so as to be movable up and down, a cylindrical rotating member 20 fitted rotatably inside the main body 19, and a seat. It consists of a rotary actuator 22 installed on the upper part of the main body 19 via a plate 21 and communicating with a rotating member 20,
The rotating member 20 is held on the fixing plate 14 by fitting an adjustment ring 24 which is rotatably disposed with a receiving member 23 on the lower edge of the mounting hole of the fixing plate 14 and a screw provided around the lower part of the main body. As shown in FIG.
6 are formed alternately. As shown in FIG. 3, when the protruding strips 25 and the grooved strips 26 are fitted into each other, the fixed member 16 does not come into contact with the end surface of the rotating member 20, and as shown in FIG. Converged within the member, mold clamping plate 8
Allow for upward retreat. However, when the rotating member 20 is rotated by the rotary actuator 22 and the position of the convex line 25 is shifted from the concave line 26 as shown in FIG. 20 is restricted to a position where the end faces thereof touch each other, for example, the position shown in FIG.

The middle part of the figure is a mold mounting plate on the base plate, 28 is a mold mounting plate on the lower surface of the mold clamping plate, and 29 is a lower protruding bottle at the center of the base plate 1.

Next, the operation will be described. In the mold closed state shown in FIG. 1, when the prefill valve 4 is opened and pressure oil is supplied to the oil chamber 3b, the mold clamping piston 3.3 moves upward at high speed. At this time, if the fixed member 16 and rotating member 20 are placed in the position shown in FIG. 3, the mold clamping plate 8 will retreat in the vertical groove shown in FIG. The space opens up.

Next, when the oil resistance in the oil chamber 3b is removed and pressure oil is supplied to the oil chamber 3C, the mold clamping pistons 3, 3 move forward together with the mold clamping plate 8 toward the base plate 1 at high speed to close the mold.

Then, the prefill valve 4 is closed, pressure oil is supplied to the upper chamber 2a, and the mold is clamped. Make sure that the end surfaces of the protrusions touch each other. As a result, the mold clamping plate 8 is not retracted to the position shown in FIG. 2, but is supported by the fixed plate 14 via the control mechanism 17, so that it can sufficiently withstand the injection pressure even if the mold clamping force is small. Then, when it is necessary to compress the molten resin, the mold clamping plate 8 can be pulled toward the base plate using a mold clamping piston. mold clamping cylinders 2, 2, mold clamping pistons 3, 3 that protrude upward from the base plate 1 and also serve as high-speed opening/closing cylinders, and tie rods 6, 6 that are inserted through each mold clamping piston 3, 3 and have their lower ends fixed. A control mechanism includes a mold clamping plate 8 connected to the upper end of each mold clamping piston 3.3, a fixed plate 14 connected and held to the upper end of the tie rod, and a rotating member provided at the center of the fixed plate 14. 17 and the mold clamping plate retraction position control device formed by the fixing member 16 protruding from the upper part of the mold clamping plate 8, a vertical mold clamping device is constructed. Both high-speed opening and closing and mold clamping can be performed, and since the mold clamping cylinder is provided on the side of the base plate, the device can be constructed low. This not only simplifies the arrangement of hydraulic paths, but also simplifies oil leakage treatment and maintenance management, improving work efficiency.

Furthermore, since a device is provided between the mold clamping plate and the fixing member to control the retreating position of the mold clamping plate, it has features such as being able to easily carry out injection foam molding and compression molding by manipulating the mold. .

[BRIEF DESCRIPTION OF THE DRAWINGS] The drawings show one embodiment of the vertical mold clamping device according to the present invention, in which Fig. 1 is a longitudinal sectional front view of a half of the mold when the mold is clamped, and Fig. 2 is a half of the mold when the mold is opened. Fig. 3 is a cross-sectional plan view of the control mechanism;
FIG. 4 is a cross-sectional plan view of the control mechanism when the rotating member is rotated through 45 degrees. 1...Base board 2...Mold clamping cylinder 3...Mold clamping piston 6...Tie rod-7...Piston head 8...
...Mold clamping plate 14...Fixing plate 16
...Fixing member 17 ...Control mechanism
20... Rotating member 22... Rotary actuator 161

Claims (1)

[Claims] A plurality of vertical mold clamping cylinders installed on the sides of the base plate, a mold clamping piston that protrudes upward from the base plate and doubles as a high-speed opening/closing cylinder, and a tie rod that is inserted through each mold clamping piston and fixes the lower end. A control mechanism including a mold clamping plate connected to the upper end of each mold clamping piston, a fixed plate connected and held to the upper end of the tie rod, and a rotating member provided in the center of the fixed plate; 1. A vertical mold clamping device comprising a clamping plate retraction position control device using a fixing member installed at the top.