Synchronous control system for longitudinal beam hydraulic machine

Abstract

The invention discloses a synchronous control system for a longitudinal beam hydraulic machine. The synchronous control system comprises a machine body of the hydraulic machine, a beam, a worktable and a sliding block, wherein a plurality of groups of master cylinders connected with the sliding block are inserted into the beam; a power mechanism is arranged above the beam; the power mechanism comprises a variable oil pump motor assembly and a proportional servo oil pump motor assembly; the sliding block is a flexible beam; the variable oil pump motor assembly controls corresponding one or theplurality of groups of master cylinders according to the pressing lengths and the pressing positions of workpieces; the machine body is provided with a position detecting mechanism which induces displacement information of a plurality of positions on the sliding block corresponding to the worktable; and the proportional servo oil pump motor assembly provides compensation oil pressure for one or the plurality of groups of master cylinders corresponding to the position needing compensating power on the sliding block according to displacement signals of the plurality of positions on the sliding block. The improved system can set corresponding pressing ways according to different pressing lengths and pressing positions, ensures synchronous pressing and return trips of the sliding block, and improves the unbalance loading resistance of the hydraulic machine and the pressing quality of products.

Description

technical field [0001] The invention belongs to the technical field of hydraulic presses, in particular to a synchronous control system in a longitudinal beam hydraulic press. Background technique [0002] The anti-deformation ability of each part of the workpiece pressed by the hydraulic press is different. In most cases, it deviates from the center of the press, causing eccentric loads, causing the moment of the beam of the hydraulic press to tilt, and cannot maintain a horizontal state. This not only affects the pressing of the workpiece, but also reduces the hydraulic press. service life. Therefore, it is necessary to carry out synchronous control on the slider movement of the longitudinal beam hydraulic press, but most of the known longitudinal beam hydraulic presses are side-by-side hydraulic presses. The sliders move along independent guide rails driven by their respective oil cylinders, and the hydraulic presses are controlled by proportional valves or synchronous va...

AI Technical Summary

Problems solved by technology

[0002] The anti-deformation ability of each part of the workpiece pressed by the hydraulic press is different. In most cases, it deviates from the center of the press, causing eccentric loads, causing the moment of the beam of the hydraulic press to tilt, and cannot maintain a horizontal state. This not only affects the pressing of the workpiece, but also reduces the hydraulic press. service life

Therefore, it is necessary to carry out synchronous control on the slider movement of the longitudinal beam hydraulic press, but most of the known longitudinal beam hydraulic presses are side-by-side hydraulic presses. The sliders move along independent guide rails driven by their respective oil cylinders, and the hydraulic presses are controlled by proportional valves or synchronous valve mechanisms. Synchronization of sliders during pressing, this control method has complex structure and low control precision

On September 23, 2009, the State Intellectual Property Office of the People's Republic of China published two patents titled "A Large-Span Longitudinal Beam Hydraulic Press Main Machine" and "A Longitudinal Beam Hydraulic Press Deviation Correction Device". The former adopts a multi-column structure. The guide achieves the purpose of synchronization, and at the same time increases the length of the guide rail to improve its anti-eccentric load capacity, but the use of this structure makes the fuselage huge, heavy in weight, high in cost, poor in economy, and basically uncontrolled in synchronization; The return correction oil cylinder is set at the end, and the follow-up control method is adopted. When the horizontal position of the left and right ends of the slider deviates, the return correction oil cylinder follows the change, so that the horizontal position deviation at both ends of the slider is approximately zero. Although this control method controls the accuracy However, its control method is single, and its use has limitations. The output force of the correction cylinder must reach a certain ratio of the nominal force, and the energy consumption and response speed are average. The rigidity of the guide rail is mainly used to ensure the synchronization of the slider movement. The thickness of the block is used to ensure its rigidity, which makes the weight of the slider larger, more consumables, and the manufacturing cost of the equipment is increased.

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