High-low-pressure switching method for double-cylinder pumping device, hydraulic control system of double-cylinder pumping device and device

Abstract

A high-low-pressure switching method for a double-cylinder pumping device includes that, firstly, high-pressure pumping operation of the double-cylinder pumping device is stopped so as to enable the double-cylinder pumping device to keep a high-pressure pumping to-be-switched stated for first preset delay time ta; secondly, a rodless cavity of a first main oil cylinder and a rodless cavity of a second main oil cylinder are communicated with each other to form a communicated cavity, a cavity with a rod of the first main oil cylinder and a cavity with a rod of the second main oil cylinder are communicated with a first working oil path and a second working oil path respectively so as to enable the double-cylinder pumping device to keep a low-pressure pumping preparing state for second preset delay time tb; and thirdly, the double-cylinder pumping device is in a low-pressure pumping operation state. In addition, the invention further provides a hydraulic control system of the double-cylinder pumping device and a pumping device. Sequential control of high-low-pressure switching is achieved, certain buffering time is kept after a corresponding step, operation is conducted after a system oil path is stabilized, hydraulic impact is effectively relieved, and the main oil cylinders can work stably.

Description

technical field [0001] The invention relates to a control method of a double-cylinder pumping device, in particular to a method for switching high and low pressures of a double-cylinder pumping device. In addition, the present invention also relates to a hydraulic control system of a double-cylinder pumping device and pumping equipment including the hydraulic control system. The double-cylinder pumping device of the present invention is mainly used for pumping viscous materials, typically concrete pumps. Background technique [0002] Concrete, mud and other viscous materials are commonly used building materials in the field of engineering construction. These viscous materials are typically pumped by double-cylinder pumping devices (such as concrete pumps, mortar pumps, etc.), and the double-cylinder pumping devices are mainly pumped through their hydraulic pressure. The control of the control system to continuously convey the viscous material along the pipeline. [0003] T...

AI Technical Summary

Problems solved by technology

[0007] However, in the current high-low pressure switching process of the double-cylinder pumping device, each control valve in the hydraulic control system of the double-cylinder pumping device is often forcibly switched at the same time, which leads to the failure of the hydraulic control system when switching between high and low pressure. The hydraulic shock is large, the main oil cylinder is not working smoothly, and the hydraulic oil in the closed communication chamber changes greatly during different switching processes, which cannot be controlled relatively stably, which in turn causes the driving stroke of the main oil cylinder to become longer or shorter

That is to say, the existing double-cylinder pumping device does not operate according to relatively scientific and reasonable operation steps during the high-low pressure switching operation process, but performs high-low pressure switching at will, which leads to the above-mentioned double-cylinder pumping device Shortcomings

In particular, when the viscous material conveying pipe (such as concrete conveying pipe) is blocked or tends to be blocked, it is difficult for the double-cylinder pumping device to pump. At this time, blind and random switching between low and high pressure will often aggravate the blocked pipe to the extent that the system is over-pressurized, and even serious accidents such as pipe bursts occur

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