JPS6096436A - Mold clamping device having two sets of mold clamping mechanisms - Google Patents

Abstract

PURPOSE:To prevent deflection of inside mold clamping plates through inner pressure from occurring, by a method wherein a hydraulic cylinder pressing both the inside mold clamping plates are provided ascendably and descendably within an actuation space between the mutual inside mold clamping plates and mold clamping force is strengthened further by the hydraulic cylinder. CONSTITUTION:When an outside mold clamping plate 6 and an actuation plate 7 are pressed mutually in the opposite directions by a mold clamping cylinder 8, an inside mold clamping plate 5 is drawn near in the direction of the outside mold clamping plate 6 and mold clamping is generated. On the contrary, mold break is generated when the outside mold clamping plate 6 and the actuation plate 7 are drawn near each other. At the time of the mold break, a hydraulic cylinder 15 is lowered down on a stand plate 1 and put into notched parts 20, 20 of both the inside mold clamping plates 5, 5. With this construction, the hydraulic cylinder 15 does not become a hindrance to the mold break even if it is in a position of an actuation space 11 always, and when the actuation space 11 is broken through the mold clamping, the hydraulic cylinder 15 is made to ascend up to the center of both the inside mold clamping plates 5, 5 prior to the mold clamping, both the inside mold clamping plates 5, 5 are pressed at a time by actuating both rams 16, 16 through hydraulic pressure, through which it is possible to make them stand against inner pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mold clamping device having two sets of mold shaft mechanisms arranged in two rows on a plywood board.

When molding is performed with two molds arranged in parallel, two
If a mold clamping cylinder is provided between a set of mold shaft mechanisms, the molds will be too spaced apart, and the advantage of performing molding by arranging the molds in two rows will be lost. Especially il? Rison's rotary injection stretch blow molding machine performs continuous injection molding and stretch blow molding of hollow molded products, and as the gap between the blow molds increases, the diameter of the rotary disk must also increase. becomes large.

Therefore, as disclosed in Japanese Patent Application Laid-Open No. 57-128519, the mold clamping plates of two sets of mold clamping mechanisms are located inside, the blowing molds are arranged in two rows, and the mold clamping cylinders located outside The mold is clamped by opening and closing a pair of mold clamping plates and applying pressure.

A drawback of such a conventional structure is that the mold clamping plate located inside is bent by internal pressure during molding. This deflection is thought to be caused by the fact that there is nothing to support the inner mold clamping plate at the center during mold clamping, and the fact that it is pulled on both sides.The deflection becomes more pronounced as the number of cavities increases. , there may be a difference in the volume of the cavity on both sides of the mold and in the center.

This invention has been devised to eliminate the above-mentioned drawbacks of the conventional technology, and its purpose is to prevent the mold from closing even if there is a space between the inner mold clamping plates of the mold clamping mechanisms arranged in two rows tI'i. This is done by pressurizing the inner mold clamping plate and correcting the deflection of the inner mold clamping plate due to internal pressure.

Moreover, the purpose of the pond of this invention is to enable the pressurizing device for the inner mold clamping plate using a hydraulic pressure/cylinder to be housed in both inner mold clamping plates when the mold is opened, so that despite the provision of the hydraulic cylinder,
It is an object of the present invention to provide a mold clamping device with a new configuration that allows the interval between inner mold clamping plates to be set to the minimum required for mold opening.

A feature of the present invention for the above-mentioned purpose is that a hydraulic cylinder for pressurizing both inner mold clamping plates is provided in the working space between the inner mold clamping plates so that the hydraulic cylinder can be freely lowered, and the accommodation portion of the hydraulic cylinder is placed between the two inner mold clamping plates. The hydraulic cylinder is provided in the lower part of the mold so that the hydraulic cylinder does not impair the movement of the inner mold clamping plate when the mold is opened.

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

In the figure, 1 is made of plywood with fixed plates 2 and 2 installed on the inside of the top surface.
Moreover, a guide rod 3.degree. 3 is installed inside the fixed plates 2,2.

4 is a mold clamping mechanism, which is a blow mold A having multiple cavities.
A pair of mold clamping plates 5 and 6 are mounted on opposing surfaces, and an actuating plate 7 parallel to the outer mold clamping plate 6. Between the actuating plate 7 and the outer mold clamping plate 6, a plurality of hydraulic The operating mold clamping cylinder 8 is
The cylinder is fixed to the outer clamping plate 6, and the ram 9 is fixed to the operating plate 7.

Further, the inner mold clamping plate 5 is connected to the actuating plate 7 by tie rods 10 on both sides provided through the outer mold clamping plate 6, so that the inner mold clamping plate 5 moves together with the actuating plate 7 in the same direction.

The two sets of mold clamping mechanisms 4, 4 having the above structure are arranged between the fixed plates 2, 2 of the base plate 1, with the mold clamping plate side facing inside.

In this case, an operating space 11 necessary for mold opening is provided between both inner mold clamping plates 5, 5, and both mold clamping plates 5, 6 and operating plate 7 are inserted through the guide rod 3. , is provided to open and close between position control members 13 and 14 fixed to the guide rod 3 by a mold clamping cylinder 8.

15 is a hydraulic cylinder that pressurizes both inner mold clamping plates 5, 5;
Rams 16 are provided on both sides of the cylinder, connected to a rod 18 of an air or hydraulic lifting device 17 attached to the underside of the plywood 1, and arranged in the center of the working space 11.

In addition, a notch 20 is provided at the lower center of both inner mold clamping plates 5, 5.
2 (+) is provided, and this cutout side 20 forms a housing portion for the hydraulic cylinder 15.

Therefore, in the mold clamping device having the above structure, when the outer mold clamping plate 6 and the operating plate 7 are pressurized in opposite directions by the mold clamping cylinder 8, the inner mold clamping plate 5 is also pressed against the outer mold clamping plate 7. It is pulled in the direction of , and mold clamping occurs.

On the other hand, when the outer mold clamping plate 6 and the working plate 7 are drawn together by the mold clamping cylinder 8, the inner mold clamping plate 5 moves in the opposite direction to the outer mold clamping plate 6 and moves there. Mold opening occurs. The outer mold clamping plate 5 and the operating plate 7 are moved simultaneously by a hydraulic cylinder 8, or one of them is moved by a fixed platen.
This occurs in stages, such that one comes into contact with the position control member 13 and stops moving, and then the other moves.

The hydraulic cylinder 15 is interposed between the inner mold clamping plates 5, 5 only when the mold is clamped, and is lowered onto the plywood 1 when the mold is opened, so that the inner mold clamping plates 5, 5 return when the mold is opened. When
The hydraulic cylinder 15 is placed in such a way that it fits in the notches 20 and 2 (L).Thereby, even if the hydraulic cylinder 15 is always in the position of the working space 11, it does not become an obstacle to opening the mold, and the working space 11 is still opened when the mold is closed. When - both inner mold clamping plates 5 are attached to the line drawing
, 5 to the center thereof, and then hydraulically actuate both rams 16, 16 to pressurize both inner mold clamping plates 5, 5 at the same time to counteract the internal pressure.

Therefore, even if the internal pressure of the blowing mold A acts on the inner mold clamping plate 5 during molding, the inner mold clamping plate will not bend as would happen when the inner mold clamping plates 5, 5 are pulled on both sides. .

As described above, this invention has two sets of mold clamping mechanisms arranged in two rows, with the mold clamping plates facing inside and working spaces between fixed plates on plywood. A hydraulic cylinder that pressurizes the plate is provided so that it can be moved up and down, and the mold clamping force is further enhanced by the hydraulic cylinder, so both inner mold clamping plates can withstand the internal pressure during molding, even in the case of a mold with a large number of cavities. Also, there is no possibility that a dent will occur on the mold clamping plate (III).

In addition, a housing part for the hydraulic cylinder is provided in the lower part of both inner mold clamping plates, so that the hydraulic cylinder does not make it difficult to open the mold, and the device itself is conventionally placed sideways with the hydraulic cylinder and its elevating device. It has the advantage that it is not particularly complicated since it is only necessary to add

[Brief explanation of the drawing]

The drawings show an embodiment of a mold clamping device having two sets of mold clamping mechanisms according to the present invention, and FIG.
9 is a plan view, FIG. 2 is a side view, and FIG. 3 is a side view in half when the mold is opened.

Claims (1)

[Claims] ゛Equipped with a pair of mold clamping plates with a mold mounted on opposing surfaces, and an operating plate parallel to the clamping plates, a clamping cylinder is provided between one of the clamping plates and the operating plate, and a clamping cylinder is provided between one of the clamping plates and the operating plate. In a mold clamping device assembly, two sets of mold shaft mechanisms connecting a clamping plate and an operating plate are arranged in two rows with the mold clamping plate facing inside and an operating space between fixed plates on a base plate. , two sets of molds characterized in that a hydraulic cylinder for pressurizing the cylinder inner mold clamping plate is provided in the working space so as to be movable up and down, and a housing portion for the hydraulic cylinder is provided in the lower part of the cylinder inner mold clamping plate. # Mold clamping device d0 with mechanism