Hydraulic control system for novel servo pump control bending machine

Abstract

The invention belongs to the technical field of hydraulic control and particularly relates to a hydraulic control system of a novel bending machine, i.e. a servo pump control system. The hydraulic control system comprises a motive power source and a control valve group, wherein the motive power source is connected with a numerical control system. The hydraulic control system is characterized in that the motive power source comprises a servo motor, a bidirectional quantitative pump and an oil tank, the bidirectional quantitative pump and the oil tank are connected with the servo motor, the control valve group comprises a shuttle valve, a pressure valve, an unloading valve, a one-way valve, a reversing valve, a back pressure valve, a poppet valve, a safety valve and a liquid filling valve, the pressure valve is used for regulating the system pressure, an oil inlet and outlet of the bidirectional quantitative pump is controlled by the shuttle valve, a positive oil outlet is directly connected with an upper cavity of an oil cylinder, a reverse oil outlet is connected with a lower cavity of the oil cylinder through the poppet valve and the back pressure valve, an oil inlet and outlet of the bidirectional quantitative pump is connected with the oil tank through the one-way valve, the reversing valve and the liquid filling valve, the liquid charging valve is connected with the control valve, and the safety valve is connected between the oil tank and the lower cavity of the oil cylinder. The hydraulic control system has the characteristics that efficiency is high, the energy is saved, and the synchronous precision is high.

Description

technical field [0001] The invention belongs to the technical field of hydraulic control, and in particular relates to a novel hydraulic control system of a bending machine, that is, a servo pump control system. Background technique [0002] The CNC bending machine is mainly used for sheet metal processing, which can automatically calculate the mechanical position according to the angle, reduce the difficulty of operation and improve work efficiency. The spool valve hydraulic control system equipment developed in the 1950s is mainly used in the CNC bending machine system. The performance parameters of the spool valve hydraulic control system are low. The device produces a large eccentric load moment, which cannot guarantee the displacement accuracy of the oil cylinder, and may cause deformation of the main machine mechanism, resulting in low precision of the bending machine. At the same time, the control part has a complex structure, high failure rate, serious leakage, unsta...

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Problems solved by technology

The spool valve hydraulic control system equipment developed in the 1950s is mainly used in the CNC bending machine system. The performance parameters of the spool valve hydraulic control system are low. The device produces a large eccentric load moment, which cannot guarantee the displacement accuracy of the oil cylinder, and may cause deformation of the main machine mechanism, resulting in low precision of the bending machine. At the same time, the control part has a complex structure, high failure rate, serious leakage, unstable action, and impact. Big, fast down speed can not be adjusted, takes up a lot of space, and maintenance is inconvenient

[0003] At present, the principle of the hydraulic control system of the domestic electro-hydraulic servo synchronous bending machine is similar. It has not changed for decades. It is a valve control system, which adopts the principle of throttling and speed regulation. The energy loss is large, the system is prone to heat, and the efficiency is low.

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