Displacement balance control device for movable pressing plate on cold press and control method of displacement balance control device

Abstract

The invention discloses a displacement balance control device for a movable pressing plate on a cold press. The displacement balance control device comprises a left hydraulic oil cylinder, a right hydraulic oil cylinder, a pull rod oil cylinder, an oil way system, a central control system established based on a PLC and a pressing plate balance detection device, wherein the pressing plate balance detection device is arranged on the pressing plate of the cold press and comprises a swing rod, a stand column and a cross beam, the stand column and the cross beam are fixedly connected in a crossed mode, the stand column is vertically and fixedly installed on the pressing plate of the cold press, a pin shaft is arranged on one side of the top of the stand column, one end of the swing rod is connected with the pin shaft and rotates around the pin shaft, and optoelectronic switches are symmetrically arranged at the two ends of the side, opposite to the swing rod, of the cross beam. By use of the displacement balance control device, the displacement balance of the pressing plate can be automatically adjusted in the working process of the cold press, and the problem that the pressing plate inclines due to displacement unbalance is solved, so that damage to a machine is reduced, and the cold pressing quality of a plate blank is improved.

Description

technical field [0001] The invention belongs to the technical field of plate production equipment, and in particular relates to a displacement balance control device and a control method for a movable platen on a cold press. Background technique [0002] In the production of plywood, after the glued veneers are assembled, the fluffy slabs must be cold-pressed to make them preliminarily shaped for further hot-pressing. Because the slab is long, the cold press commonly used at present is a single-pump double-cylinder platen suspension down-press type cold press, that is, a high-pressure oil pump simultaneously drives the hydraulic plungers in the left and right hydraulic cylinders to go down. , so as to push the upper movable platen down to perform cold pressing on the slab stack. At present, there is a difficult problem in the working process of this type of cold press, that is, because the upper movable platen of the cold press is freely suspended on the lifting rod through...

AI Technical Summary

Problems solved by technology

At present, there is a difficult problem in the working process of this type of cold press, that is, because the upper movable platen of the cold press is freely suspended on the lifting rod through a hinge, and the left and right pressure pads of the upper movable platen are connected to the The ends of the hydraulic plungers are in unconstrained free contact, so when the left and right hydraulic plungers go down, due to the unbalanced frictional resistance of the left and right oil cylinders, a displacement difference occurs between the left and right hydraulic plungers, thereby causing the upward movement Platen tilted

This inclination phenomenon will produce the following two adverse consequences: (1) The plane contact between the end of the hydraulic plunger and the pressure backing plate becomes edge point contact, making the end of the hydraulic plunger and the pressure backing plate vulnerable to damage

(2) Since the upper movable platen is in oblique contact with the upper layer of the slab, when the upper movable platen tends to be horizontal under pressure, it will generate horizontal friction on the upper slab, which will displace the upper slab and affect the cooling effect. pressure effect

There is no effective solution to the above-mentioned problems in the work of the slab cold press in the industry

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