Pumping reversal hydraulic control system, control method and concrete conveying pump

Abstract

The invention provides a pumping reversal hydraulic control system comprising a pressure oil source, a master oil cylinder, a master cylinder reversal valve, a swinging oil cylinder, a swinging cylinder reversal valve, a pressure sensor, a first directional valve, an accumulator and a controller, wherein when the master oil cylinder reaches a reversing position or a preset position in front of the reversing position, at least part of pressure oil in the pressure oil source enters the accumulator through the first directional valve; when the pressure in the accumulator reaches a preset valve and the master oil cylinder is in the reversing position, the controller controls the swinging cylinder reversal valve to change the direction, and pressure oil in the accumulator enters the swinging oil cylinder through the swinging cylinder reversal valve; and when or after the direction of the swinging cylinder reversal valve is changed, the controller controls the master cylinder reversal valveto change the direction. Accordingly, the invention also provides a pumping reversal hydraulic control method and a concrete conveying pump. According to the invention, when the direction of the master oil cylinder is changed, the impact of a piston in the master oil cylinder on a cylinder barrel can be reduced, so that stable direction change of the pumping system is achieved, and the working efficiency of the system is improved.

Description

technical field [0001] The invention relates to the technical field of hydraulic control, in particular to a pumping reversing hydraulic control system, a control method and a concrete delivery pump. Background technique [0002] In the concrete pumping system, when the main oil cylinder reaches the reversing position for reversing, in order to reduce the impact on the cylinder caused by the rapid movement of the piston in the main oil cylinder, the related technology usually uses a variable pump as the pressure oil source. When the end position of the oil cylinder is about to be reached, the output flow of the variable pump is reduced to reduce the movement speed of the piston, so as to achieve the purpose of smooth reversing. However, the reversing frequency of the main cylinder in the pumping system is very fast. Therefore, in order to reduce the reversing impact of the main cylinder, it is necessary to frequently adjust the output flow of the variable pump, thereby reduc...

AI Technical Summary

Problems solved by technology

However, the reversing frequency of the main cylinder in the pumping system is very fast. Therefore, in order to reduce the reversing impact of the main cylinder, it is necessary to frequently adjust the output flow of the variable pump, thereby reducing the service life of the variable pump and the working efficiency of the system.

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