Hydraulic electrohydraulic ratio control system and method for prebending machine

Abstract

The invention discloses a hydraulic pressure electric liquid proportional control system for a prebending machine, aiming at solving the problem of high price of a numerical control system of the existing steel plate prebending machine. The proportional control system comprises a hydraulic proportional valve closed-cycle control system and a slide block external ring closed-cycle control system, wherein, the hydraulic proportional valve closed-cycle control system comprises a hydraulic proportional amplifier, an electric liquid proportional direction valve with high flow rate and a valve case inner loop feedback part, and the numerical control system is electrically connected with a proportional valve amplifier by voltage control signals; the proportional valve amplifier is electrically connected with the electric liquid proportional direction valve with high flow rate by high driving currents; the electric liquid proportional direction valve with high flow rate is connected with a hydraulic system of a main oil cylinder of the prebending machine; and the main oil cylinder of the prebending machine is connected with the slide block of the prebending machine by a mechanical system. By adjusting DNC-60PS control parameters, the proportional control system guarantees the start, the high-speed rise, the low-speed rise, the positioning stop, the pressure maintenance, the pressure relief and the fast return of the slide block of the prebending machine, and has stable running of the entire process, high response speed and high positioning accuracy.

Description

technical field [0001] The invention belongs to the manufacturing industry of large longitudinal submerged arc welded pipe equipment, and relates to the control of a large-flow proportional valve specially used for a steel plate pre-bending machine. Background technique [0002] Since the steel plate pre-bending machine is the first large-scale complete set of equipment in China, the CNC system currently used internationally is the MAC8 system produced by the German BOSCH-REXROCH company. MAC8 is very expensive (a set of four-axis synchronous control system is quoted at about 1.68 million yuan) Production costs are high. [0003] If two sets of DNC-60PS ordinary two-axis CNC bending machine systems from Swiss CBLCLE Company are used, the average price is around 80,000 RMB. Contents of the invention [0004] The purpose of the present invention is to provide a pre-bending machine hydraulic electro-hydraulic proportional control system to solve the problem that the existing...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a pre-bending machine hydraulic electro-hydraulic proportional control system to solve the problem that the existing steel plate pre-bending machine numerical control system is expensive

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