Integrated device for controlling wall thickness by digital cam and servo motor

Abstract

The invention relates to a plastic extrusion blowing wall thickness control device and particularly relates to an integrated device for controlling wall thickness by a digital cam and a servo motor. The integrated device comprises a digital cam software system and a servo motor control mechanical device, wherein the servo motor control mechanical device comprises the servo motor, a ball screw helical pair, a guide pillar, a fixed support plate, a movable support plate, a piston rod, a movable guide mechanism, a hydraulic gravity balancing mechanism, a cylinder body fixing plate, a precise cylinder body, an extrusion die head device and a stander. The integrated device is mainly used for controlling the wall thickness of a plastic extrusion bottle blowing machine in a dairy industry, the shape of the digital cam can be changed according to different products, and thus plastic products with different wall thicknesses can be produced by extrusion blowing. As the integrated device is provided with the digital cam and the servo motor, not only is the strength of the extruded products with the uniform wall thicknesses of the device greatly improved, but also raw materials are saved, the cooling time of the finished product is shortened, the defective percentage is lowered, and the production rate and the quality of the products are greatly improved.

Description

technical field [0001] The invention relates to a plastic extrusion and blowing wall thickness control device, in particular to an integrated device for controlling wall thickness with a digital cam and a servo motor. Background technique [0002] Hollow plastic products are obtained by blow molding. The product has a minimum wall thickness because of its strength requirements. However, the early hollow blow molding equipment lacks a parison wall thickness control system. In order to make the thinnest part of the product meet the minimum wall thickness requirement, the product The other parts of the material will be thickened accordingly, resulting in a waste of material. In order to save cost, shorten product cooling time, and speed up product production cycle, a more economical method is to use digital cam servo motor to control parison wall thickness. At present, the wall thickness controllers used in China include products from companies such as Moog (M00G), B&R (B&R), ...

AI Technical Summary

Problems solved by technology

It is composed of an electro-hydraulic proportional pressure reducing valve and a hydraulic reversing valve, and the size of the forward and reverse openings of the hydraulic reversing valve is controlled according to the outlet pressure, so as to control the direction of the liquid flow and the size of the flow, and finally control the mandrel. The displacement and direction of the device, because the device adopts hydraulic control, it has the characteristics of time lag and the system itself is easily affected by the outside world, resulting in low control accuracy

Although continuous control can be obtained by using a mechanical cam, there is no problem of time lag, but because the movement of the cam mechanism is a high-level point or line contact, the amount of wear is large, and one cam is only for one hollow plastic product, flexible to a lesser extent

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