A full hydraulic control pumping hydraulic system for mine wet spraying machine

Abstract

The invention discloses a full-hydraulic control pumping hydraulic system used for a wet spraying machine for mining. Liquid is respectively and independently supplied by a concrete cylinder pumping system and an S valve tilt cylinder system; when the concrete cylinder pumping system works normally, a constant output pump (2) works in a maximum pump discharge state, the discharge capacity of a constant pressure pump (3) is minimum, and power of an electric motor (1) is matched with that of the constant output pump (2); when a concrete cylinder reaches a stroke end point, an S valve tilt cylinder hydraulic reversing valve (15) changes the direction, the discharge capacity of the constant output pump (2) is minimum, the discharge capacity of the constant pressure pump (3) is maximum, and the power of the electric motor (1) is matched with that of the constant pressure pump (3); when an S valve tilt cylinder quickly moves to the end point, pressure rises, the discharge capacity of the constant pressure pump (3) is minimum, a main cylinder hydraulic control reversing valve (9) and a hydraulic control reversing valve (6) both change directions, the constant output pump (2) works in a maximum pump discharge state, and a concrete cylinder system starts to work. According to the full-hydraulic control pumping hydraulic system, the power of the electric motor is automatically matched with operating of the concrete cylinder pumping system and the S valve tilt cylinder system, and the power of the whole machine is reduced.

Description

technical field [0001] The invention relates to a mine wet spraying machine, in particular to a full hydraulic control pumping hydraulic system for a mine wet spraying machine. Background technique [0002] Among the coal mine underground concrete machinery products, the wet sprayer is a mechanical device that can spray the mixed concrete to the working face. Its pumping system has full hydraulic control and electro-hydraulic control. Its working principle is that the hydraulic pump provides oil The hydraulic pumping system and the S valve distribution system, when the oil cylinder runs to the end, the reciprocating movement of the actuator is realized through the reversing of the hydraulic control valve. One of the oil cylinder reversing signals is generated by the pressure oil at the end of the stroke, and the other is generated by the sensor at the end of the stroke. [0003] Due to the influence of the small operating area of ​​the mine, the structure of the whole machi...

AI Technical Summary

Problems solved by technology

The direction of the reversing valve is crossed and controlled, but the displacement and power consumption of the pump cannot be matched alternately. Generally, the power of the motor in the double-pump control system needs to reach the maximum power required by the concrete cylinder pumping cylinder system and the swing of the S valve. The sum of the maximum power required by the cylinder system will inevitably cause a great waste of energy

Images