Electric plasticization drive method and apparatus based on direct back-pressing feed back control

Abstract

The invention discloses an electric plasticization driving method and a device for direct backpressure feedback control. The device comprises an injection servo motor, a gauging servo motor, an electric plasticization actuating mechanism, and a controller; wherein, the electric plasticization actuating mechanism comprises a screw, a gauging gear, a bearing, a pressure sensor, a screw mandrel and an injection gear; the gauging gear is arranged on the screw; the bearing and the pressure sensor are arranged at the end part of the screw; a bearing support cavity structure is arranged at one end of the screw mandrel; the injection gear is arranged on the screw mandrel. The method comprises the steps as follows: the screw mandrel is designed to adopt the bearing support cavity structure which is arranged at the front end of the screw mandrel, the screw butts against the front end of the screw mandrel through the bearing, and the pressure sensor is arranged in the joint between the screw andthe screw mandrel; based on the injection molding technology, a backpressure set value is input, the servo motor is driven by the direct feedback control through the on-line measure of the pressure, and the coordinated actions of pre-plasticizing, gauging and injection are executed. The electric plasticization driving method and the device solve the problem of action matching between the servo motors in an electric injection device, the structure is simple, the manufacture is easy, and the cost is low.

Description

technical field [0001] The invention relates to an electric plasticizing drive method and device with direct back pressure feedback control. Background technique [0002] In the prior art, most of the injection devices commonly used in plastic injection molding machines are hydraulic drive mechanisms. During pre-molding, when the screw back pressure retreats, the piston can move back together with the screw after the injection cylinder is relieved. There is no interaction between plasticizing motion and injection motion. However, with the further maturity of the plastic products processing industry, higher and higher requirements are placed on plastic machinery. In order to achieve the goals of high efficiency, precision and energy saving, electro-hydraulic composite injection molding machines and all-electric injection molding machines have been developed rapidly in recent years. Among them, the electric plasticizing drive is a key component. As far as the electric plast...

AI Technical Summary

Problems solved by technology

This kind of structure is only equivalent to the back pressure control under the load of one tenth of the injection pressure. It needs to use a special electromagnet for precise control, but its cost is expensive.

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