Control method and control device of soft start and soft stop of air compressor

Abstract

The invention relates to a control method and a control device of soft start and soft stop of an air compressor, wherein the control method is characterized by controlling the operation states of a switch valve and a proportional valve of the air compressor through changing the external input, and further controlling the operation state of a hydraulic motor so as to achieve the soft start and soft stop of the air compressor. The control method comprises the following steps: setting the switch quantity of the external input N and controlling the output value of the switch valve m, wherein when N=N1, switch valve m=m1, and a time begins to timing, current in the proportional valve increases gradually, and when the timing time t reaches the set time, the current of the proportional valve reaches the set current value, and when N=N2, the switch valve m=m2, and the timer begins to timing, current in the proportional valve decreases gradually, and after the timing time t reaches the set time, the current of the proportional valve k reaches the set current value; and controlling the operation state of the air compressor through setting the value of the set current value of the proportional valve. According to the invention, the technical prejudice of the field is overcome effectively.

Description

technical field [0001] The invention relates to a control method and a control device, in particular to a control method and a control device for soft start and soft stop of an air compressor. Background technique [0002] The air compressor, that is, the air compressor, is the main body of the air source device. It is a device that converts the mechanical energy of the prime mover into gas pressure energy, and is a pressure generating device for compressing air. Air compressors are used more and more as power sources in engineering equipment. Most of the air compressors in the market are sold as a complete set with the motor and control system. Due to the construction machinery structure and control methods, the existing control machine equipment is not suitable for construction machinery. [0003] Since most of the air compressors used in construction machinery are bare metal without motors and control systems, the control system must be redesigned when designing machine...

AI Technical Summary

Problems solved by technology

[0006] (1) Since the air compressor is controlled by only one on-off valve, once the on-off valve is energized, the hydraulic motor is in the maximum working state, and the air compressor suddenly runs at the maximum working state, resulting in unstable power of the equipment;

[0007] (2) When the switch valve loses power, the operation of the air compressor will stop suddenly like an emergency stop, which will easily cause the outlet pressure of the air compressor to be too high and shorten the service life of the air compressor

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