JPS6135925B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mold clamping device such as an injection molding machine, and more particularly to a vertical mold clamping device such as an injection molding machine that opens and closes a mold in a vertical direction.

This type of mold clamping device usually has a fixed mold at the bottom, which allows for a large installation space even when the mold is relatively large, and because it moves in the direction of gravity even if the mold is heavy. It has the advantage of good stability, and when using an insert, the loaded insert is stable and does not move. In addition, although there are advantages such as the relatively small installation floor area of the machine, there are disadvantages such as maintenance due to the increased height of the machine. It is troublesome to change molds, the molding cycle takes time because the mold clamping speed cannot be made very fast, or if the mold clamping mechanism is a toggle type, it is extremely troublesome to adjust the mold thickness. However, there are disadvantages such as increased production costs and the complexity of various operations required to handle large amounts of oil.

An object of the present invention is to provide a vertical mold clamping device for an injection molding machine or the like, which eliminates the drawbacks of conventional devices and can shorten molding cycle time and reduce manufacturing costs.

Next, one embodiment of the present invention will be described with reference to FIG. 1. Reference numeral 1 denotes a fixed plate to which a fixed mold 2 is attached.

3 is a moving plate on which a moving mold 4 is attached,
The molds 2 and 4 are brought into contact with each other at a mold mating surface A. Reference numeral 5 denotes a moving cylinder that moves the moving plate 3 backward relative to the fixed plate 1. Reference numeral 6 denotes a boss whose one end is attached in a cantilevered manner to the surface opposite to the mold attachment surface of the movable plate 3, and a female thread 7 is provided in the center thereof. Reference numeral 8 designates a lifting screw shaft having a male screw 9 on its outer surface that is screwed into a female screw 7 provided on the boss 6. Reference numeral 10 denotes a spline shaft, one end of which is rotatably supported by the movable die plate 3, and meshes with a spline provided on the inner diameter surface of the lifting screw shaft 8. A sprocket 11 is fixed to the spline shaft 10, and a chain 13 driven by a geared motor 12 is meshed with the sprocket. The screw shaft 8 rotates to adjust the length of the shaft protruding from the end surface 13 of the boss 6 on the side opposite to the moving plate. Reference numeral 14 denotes a tie bar that connects the mold 2 between the fixed plate 1 and the pressure receiving plate 15 facing each other at a predetermined distance across the movable plate 3.
and 4 are subjected to mold clamping force.

Reference numeral 16 denotes a mold clamping cylinder which enters between the end surface C of the lifting screw shaft 8 opposite to the boss and the pressure receiving plate 15 only when the mold is clamped, and acts in the axial direction to push open the gap L between them. At other times, it slides or rotates by a distance l from the above-mentioned space and comes out as shown by the imaginary line 16a. Therefore, if a plurality of mold clamping devices are provided and the mold clamping cylinders are sequentially inserted into the space only during mold clamping, one mold clamping cylinder can clamp multiple molds. I can do it.

Distance L between the end face of the lifting screw shaft and the pressure receiving plate
does not vary depending on the mold thickness of molds 2 and 4,
Adjustment is made so that the height of the lifting screw shaft 8 is always constant depending on the thickness of the mold. Therefore, the mold clamping cylinder 16
The piston stroke is small and the pressure rises quickly without moving a large amount of oil, making it possible to shorten the molding cycle as set out by our company, and eliminating the need for large hydraulic cylinders like conventional equipment, reducing manufacturing costs. can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing one embodiment according to the present invention. 1... Fixed plate, 3... Moving plate, 6
... Boss, 8 ... Screw shaft for lifting, 14 ... Tie bar, 15 ... Pressure receiving plate.

Claims (1)

[Scope of Claims] 1. A mold clamping device for an injection molding machine or the like that opens and closes a fixed mold attached to a fixed plate and a movable mold attached to a movable plate in a vertical direction, and has the following configuration requirements. a A boss with a female thread installed at one end in a cantilevered manner on the opposite mold mounting surface of the movable plate, an external surface provided with a male thread that engages with the female thread of the boss, and an inner surface with one side attached to the movable plate. a lifting screw shaft that meshes with a rotatably supported spline shaft and adjusts the length of the shaft protruding from the opposite end of the boss as the spline shaft rotates; a mold thickness adjusting device comprising a geared motor that drives a chain that engages with a sprocket fixed to the spline shaft and rotates the spline shaft in forward and reverse directions, b. a tie bar that receives the mold clamping force applied to the mold between the pressure receiving plate facing each other; A mold clamping cylinder that works to push open the space between the screw shaft end face and the pressure receiving plate when the mold is opened. 2 A plurality of mold thickness adjusting devices described in the above item a and a mold clamping device each equipped with a tie bar described in the above item b to open and close the mold in the vertical direction are provided, and the mold clamping cylinder described in the above item c is commonly used. Said patent claim 1
Mold clamping device as described in section.