Hydraulic system for controlling rotation of boom, control method thereof and concrete pumping equipment

Abstract

The invention discloses a hydraulic system for controlling rotation of a boom and a control method thereof. The hydraulic system comprises a hydraulic motor, a main valve, a hydraulic pump and an oil tank. When the main valve controls the hydraulic motor to rotate, an oil inlet passage of the hydraulic motor is communicated with the hydraulic pump, and an oil return passage is communicated with the oil tank. After the main valve controls the hydraulic motor to stop rotating, the oil inlet passage and the oil return passage are both locked. The hydraulic system comprises a controller and a detection device. After the main valve controls the hydraulic motor to stop rotating, the detection device is capable of detecting pressure value of the oil return passage, and the controller controls the degree of opening of the main valve based on the pressure value so as to enable the oil return passage to be communicated with the oil tank. Therefore, when the boom starts to stop rotating and the oil inlet passage and the oil return passage are locked, the degree of opening of the main valve is controlled based on the pressure changes of the oil return passage so that the oil return passage can be communicated with the oil tank again, pressure cannot be accumulated in the oil return passage, and thus rebounding occurring after the boom stops rotating is avoided. The invention further discloses concrete pumping equipment provided with the hydraulic system for controlling rotation of the boom.

Description

technical field [0001] The invention relates to the field of hydraulic control for arm frame rotation, in particular to a hydraulic system for controlling arm frame rotation, a control method and concrete pumping equipment using the hydraulic system. Background technique [0002] Among all kinds of construction machinery, boom slewing conditions are often used, such as concrete pump trucks in concrete pumping equipment, or tire-type cranes, etc. Among them, the concrete pump truck is a modern construction equipment used for continuous concrete pouring construction. It has the advantages of flexible maneuvering, high construction efficiency, good construction quality, and low environmental pollution, and is widely used in modern building construction. In the concrete pump truck, the distribution point can be conveniently changed through the swing or rotation of the boom, where the rotation of the boom is usually driven by a hydraulic motor. Due to the heavy weight of the bo...

AI Technical Summary

Problems solved by technology

This brings great hidden dangers to the positioning and operation safety of the concrete pump truck distribution point

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