Leveling control system structure capable of realizing switching of multiple flow ranges and using method

Abstract

The invention provides a leveling control system structure capable of realizing switching of multiple flow ranges. The leveling control system structure is used for leveling a pressure output end sliding block of a press, and a leveling unit powered by a constant-pressure oil source is arranged below each corner end of the sliding block; each leveling unit is in contact with the corner end of thesliding block through a leveling cylinder provided with a displacement sensor; a rod cavity of each leveling cylinder is connected with a first pressure sensor, and a rodless cavity of each leveling cylinder is connected with a second pressure sensor; and an oil outlet path of each leveling cylinder is connected with a control valve bank so as to switch the multiple flow ranges to meet different flow requirements of the system under multiple working conditions, and the levelness of the sliding block during falling is guaranteed by improving the position synchronous control precision of the leveling cylinders of the leveling units. According to the leveling control system structure, the flow requirements under various working conditions can be accurately matched, so that the flow control accuracy of the leveling system is improved.

Description

technical field [0001] The invention relates to the technical field of composite material production equipment, in particular to the structure and use method of a leveling control system for realizing switching of various flow ranges. Background technique [0002] Composite material press is an important equipment in the compression molding process. During the compression molding process, the slider is often inclined to different degrees under the action of partial load, which will cause low product precision and aggravate mold wear and other adverse effects. The four-corner dynamic leveling control system is an important part of the high-end composite material press, which can effectively realize the synchronous control of the position of the leveling cylinder, which is used to eliminate the inclination of the slider, make the slider fall in parallel, ensure the accurate opening and closing of the mold, and improve various It is one of the key technologies to measure the ma...

AI Technical Summary

Problems solved by technology

The leveling system needs to select the corresponding large-flow servo valve according to the maximum flow condition to meet the needs of large-flow oil in and out of the leveling cylinder; the larger the flow range of the servo valve, the higher the corresponding price, and its frequency response is relatively slower, which in turn slows down the dynamic response of the entire system

[0005] (2) Using a large flow servo valve to control the flow of the leveling cylinder, the leveling system cannot achieve fine control of the flow of the leveling cylinder under various working conditions

Due to the large flow gain of the large flow servo valve, it can only realize the fine control of the flow of the leveling cylinder under the condition of large flow demand, and cannot realize the fine control of the flow of the leveling cylinder under the condition of small flow demand, so The leveling system cannot precisely match the flow requirements under various working conditions

[0006] (3) If the flow control of the leveling system is carried out by replacing the large flow servo valve with two servo valves with different diameters in parallel, although the switching of the two flow ranges can be realized, the leveling system can be used under the condition of small flow The small flow range finely controls the flow of the leveling cylinder, but there will be problems that the large-bore servo valve will interfere with the flow of the small-bore servo valve due to its inherent zero drift, temperature drift, hysteresis and other factors. The control of the leveling system Accuracy is not improved

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