Double-closed-loop redundancy pressure control system of coil hydraulic press

Abstract

A double-closed-loop redundancy pressure control system of a coil hydraulic press comprises a PLC (programmable logic controller) used for controlling the coil hydraulic press, a touch screen exchanging parameters with the PLC through a bus and an industrial personal computer exchanging complex operation functions with the PLC through the industrial Ethernet. The PLC is connected with one end of each of a variable frequency motor, a high-frequency response servo valve and a proportional pressure valve, the variable frequency motor, the high-frequency servo valve and the proportional pressure valve are controlled through the PLC, the other end of the variable frequency motor is connected with a metering pump driven by the variable frequency motor, the other end of each of the metering pump, the high-frequency servo valve and the proportional pressure valve is connected with a hydraulic cylinder of the coil hydraulic press driven through each of the metering pump, the high-frequency servo valve and the proportional pressure valve, the other end of the hydraulic cylinder is connected with a pressurized platform driven through the hydraulic cylinder, a pressure sensor connected with the PLC and feeding back pressure feedback signals of the hydraulic cylinder to the PLC is arranged on the hydraulic cylinder, and a force sensor connected with the PLC and feeding back stress signals of a coil to the PLC is arranged on the pressurized platform. The double-closed-loop redundancy pressure control system has the advantages that double-closed-loop redundancy control is realized, the system is highly integrated, stable and reliable pressurization is achieved, and pressure control is high in precision and timeliness.

Description

technical field [0001] The invention belongs to a coil hydraulic press, which is mainly applied to the pressure control of the transformer coil precision press-fitting hydraulic press, and has a high-precision, high-stability pressure double closed-loop control structure. Background technique [0002] There are many types of transformer coils required in power systems, rail transit and other industries, and the pressure control requirements for press fittings are getting higher and higher. In the past, the solution was to switch the oil cylinder and the pressure classification method to meet the press-fitting requirements of different specifications of coils. In this way, the pressure has dead zone, low precision and poor stability. It cannot ensure the stable force of the transformer winding, which affects the short-circuit resistance of the transformer. Some small faults in the hydraulic system during the precision pressing process will cause coil damage. SUMMARY OF THE ...

AI Technical Summary

Problems solved by technology

This method has dead zones, low precision, and poor stability. It cannot ensure that the transformer windings are stressed smoothly, which affects the short-circuit resistance of the transformer. Some small faults in the hydraulic system during the precision press-fitting process will cause damage to the coil.

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