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Control system and method for flexible docking of movable beam of hydraulic press and leveling system

A technology for movable beams and hydraulic presses, applied in the field of hydraulic presses, can solve the problems of shortening the service life of presses and key hydraulic valve parts, affecting the forming accuracy of products, and long adjustment time, so as to improve synchronization and engineering application adaptability, and improve control. Accuracy and stability, the effect of improving speed and robustness

Active Publication Date: 2022-03-08
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) The docking speed of the movable beam and the four-cylinder leveling system cannot be effectively matched
That is, due to the large inertia of the movable beam, when the two collide with each other with a large speed difference, the pressure shock of the rodless cavity of the four leveling cylinders will be relatively large, causing mechanical vibration and noise. The long-term high-frequency pressure shock will be extremely The service life of the compressor and key hydraulic valves is greatly shortened; in addition, at the moment of rigid collision, the movable beam is subjected to the abrupt upward resistance exerted by the leveling cylinder on the movable beam, which makes the movable beam have a sudden change in speed or even stops at the docking point, which is not conducive to Subsequent billet pressing and leveling control will ultimately affect the molding accuracy of the product
[0005] (2) The leveling system cannot adapt to the initial horizontal deviation of the four corners when the movable beam is docked
That is, before docking, the four leveling cylinders of the leveling system can ensure a certain level of accuracy when performing closed-loop position control at the waiting position. Due to the impact of the movable beam, there is a certain initial level deviation when it is docked. When docked, the movable beam will rigidly collide with the four leveling cylinders in sequence, causing the initial leveling error of the leveling system, which is not conducive to the subsequent synchronous control of the four cylinders.
[0006] (3) After the rigid collision between the movable beam and the leveling cylinder, the pressure PID control of the rodless cavity of the leveling cylinder has poor anti-interference ability and long adjustment time
After the movable beam is docked with the leveling cylinder, the pressure in the rodless chamber of the leveling cylinder suddenly increases and shakes. In order to make the leveling cylinder close to the movable beam and stabilize the pressure, PID pressure control is used for the rodless chamber of the leveling cylinder. However, the PID control adjusts Long time, sensitive to coupling interference, and limited effect on stabilizing pressure, which is not conducive to the leveling control of the subsequent four cylinders

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  • Control system and method for flexible docking of movable beam of hydraulic press and leveling system
  • Control system and method for flexible docking of movable beam of hydraulic press and leveling system
  • Control system and method for flexible docking of movable beam of hydraulic press and leveling system

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Embodiment Construction

[0045] The technical solution of the present invention will be specifically described below in conjunction with the accompanying drawings.

[0046] It should be pointed out that the following detailed description is exemplary and is intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0047] It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components...

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Abstract

The invention relates to a control system and method for flexible docking of a movable beam of a hydraulic machine and a leveling system. Input the command signal with the same difference to the proportional servo valve of the leveling cylinder to control the circular fall of the leveling cylinder and collect the displacement of the leveling cylinder and the pressure of the rodless chamber, and record the corresponding command signal; use the neural network algorithm to carry out model identification on the collected data , get the flow model of the valve port of the leveling cylinder control valve, and calculate the feedforward value of the speed valve port of each leveling cylinder; then, collect the position information of the movable beam and the four leveling cylinders in real time, and calculate the position information of each leveling cylinder according to the displacement difference Control the opening of the valve port, and at the same time, the displacement deviation compensation module of the four leveling cylinders adjusts and compensates the valve ports of the control valves of each cylinder; after docking, use the sliding mode controller to perform pressure tracking control on the rodless cavity of the four leveling cylinders . The invention adopts the coordinated control of the main cylinder and the leveling system and the coordinated control method of four cylinders, can realize the flexible docking of the movable beam and the hydraulic leveling system, and has strong engineering adaptability.

Description

technical field [0001] The invention relates to the technical field of hydraulic presses, in particular to a control system and method for flexible docking of movable beams of hydraulic presses and leveling systems. Background technique [0002] The hydraulic press is a machine that uses Pascal's principle, uses liquid as the working medium, and uses static pressure to transmit power to work, so that the movable beam moves up and down. As an important large-scale equipment in the manufacturing and processing industry, hydraulic presses play a vital role in the forming of large parts. In order to obtain products with good molding quality and high processing precision, the high-performance hydraulic press should have the advantages of short pressing cycle, high control precision of the movable beam, and stable operation of the hydraulic system. At present, large-tonnage hydraulic presses mostly adopt a three-beam and four-column frame structure. The movable beam in the middle...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B30B15/16B30B15/26
CPCB30B15/166B30B15/26
Inventor 杜恒吴代权汪启港张泽鑫刘闽黄惠李雨铮
Owner FUZHOU UNIV
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