Active Scraper Pitching Cylinder Pressure Stability Control System

Abstract

A pressure stabilization control system of pitching oil cylinders of an active carry-scraper comprises the first pitching oil cylinder (2), the second pitching oil cylinder (3), a main reversing valve (1), a first one-way sequence valve (7), a second one-way sequence valve (6), a reversing valve (8), a first energy accumulator (9), a second energy accumulator (10), a pressure control valve (12) and a pressure stabilization valve (13). A pressure buffer loop is connected among the first pitching oil cylinder (2), the second pitching oil cylinder (3) and the main reversing valve (1) in parallel to absorb impacts generated in the work process of the first pitching oil cylinder (2) and the second pitching oil cylinder (3). After the pressure of rod cavities or rodless cavities of the pitching oil cylinders is suddenly increased, hydraulic oil of the high-pressure cavities can be automatically conveyed to the first energy accumulator through the pressure buffer loop, and oil supplementation can be fast carried out on the low-pressure cavities from the second energy accumulator; and the heating amount of the system is small, the impact force on a pitching mechanism is effectively buffered, and the service life of the pitching mechanism of the carry-scraper is prolonged.

Description

technical field [0001] The invention relates to the technical field of hydraulic control of engineering machinery, in particular to an active scraper pitching cylinder pressure stabilization control system. Background technique [0002] The active scraper is a kind of construction machinery that integrates functions such as digging, moving, unloading, and bulldozing. It is widely used in the field of infrastructure construction. [0003] When the active scraper is performing shoveling operations, the extension of the pitching cylinder is usually constant to ensure that the cutting angle of the bucket is constant. When the bucket hits a hard object, it will cause the pressure fluctuation of the pitch cylinder, and also cause an impact on the mechanical structure. [0004] At present, in the field of construction machinery, mechanisms involving lifting generally use two-way buffer hydraulic circuits and Rexroth stabilization modules to suppress pressure fluctuations. The two...

AI Technical Summary

Problems solved by technology

The two-way buffer hydraulic circuit mainly uses the overflow of the overflow valve to slow down the impact of the high-pressure chamber of the cylinder, and at the same time, the low-pressure chamber absorbs oil from the oil tank through the one-way valve, the system generates a lot of heat and the oil replenishment speed is slow

However, Rexroth's pressure stabilization module can only suppress pressure fluctuations in one of the situations in which the piston rod of the cylinder is under pressure or under tension, which has certain limitations and is not suitable for the actual working conditions of the scraper.

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