Friction welding machine closed loop control device

Abstract

The invention discloses a friction welding machine closed controller, comprising an electrohydraulic ratio steering speed-adjusting valve, an electrohydraulic ratio overflow valve, A and B power amplifying plates, a D / A module, an A / D module, a pressure sensor and a man-machine interface module, wherein the pressure sensor uses the AD module to convert the analogue signal of cylinder pressure value into digit signal, to be compared with a preset pressure value in a PLC controller and process error calculation, to adjust the overflow pressure of the electrohydraulic ratio overflow valve, to realize the axial pressure control of function cylinder, and the PLC controller receives the direction and speed command transmitted from the man-machine interface module, while the output digit signal via the DA module is converted into analogue signal, to adjust the pressure of the electrohydraulic ratio steering speed-adjusting valve to control the open direction and size of the valve, to realize the motion speed and direction controls of the cylinder piston. The invention uses the PLC controller with analogue amount and man-machine interface function to reduce the valves, accident and realize real-time closed control in welding process.

Description

technical field [0001] The invention relates to a closed-loop control device of a friction welding machine. Background technique [0002] Referring to Fig. 2, the existing friction welding machine control device includes a slide table 1, an oil pump 4, an oil tank 5, a two-position two-way reversing valve 6, an overflow valve 7, a programmable controller (hereinafter referred to as PLC controller) 11, Oil cylinder 14, pressure relay 16, three-position four-way reversing valve 17, two-position four-way reversing valve 18, speed regulating valve 19, one-way valve 20 and pressure reducing valve 21, and the PLC controller 11 is a switch type The controller, the PLC controller 11 drives the six electromagnets on the pressure relay 16 to control the four directional valves, and cooperates with the four pressure and speed control valves to control the axial pressure of the friction welding machine, the direction and speed of the slide table movement. During the friction welding pr...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the disadvantages of high failure probability due to the large number of valves used in the prior art and the inability to perform real-time closed-loop control, the present invention provides a closed-loop control device for friction welding machines, which uses a PLC controller with analog functions and man-machine interface functions Combined with electro-hydraulic proportional reversing speed control valve and electro-hydraulic proportional overflow valve to control the axial pressure in the friction welding process, which can reduce the number of valves used and reduce the failure rate

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