The control method of the collision buffer system of the hydraulic cylinder of the pusher

Abstract

The invention discloses a control method for a hydraulic oil cylinder collision buffering system of a bulldozer. According to judgment of conditions of a travelling speed and acceleration, a corresponding overflow valve turning on condition is set by reference to oil pressure variation data under a normal working condition and a collision condition; during normal working, an overflow valve is turned off when no tremendous change happens to oil cylinder pressure and the acceleration, so that thrust force required by working is guaranteed; in case of collision, collision is judged according to variations of the oil cylinder pressure and the acceleration, and a controller can set turning on pressure of the overflow valve according to the oil cylinder pressure and the travelling speed, so that the overflow valve is controlled to be turned on when certain pressure is reached so as to function in buffering. The defect that a traditional overflow valve is fixed in the turning on pressure and cannot allow overflow and pressure release before the oil cylinder pressure reaches the overflow turning on pressure is overcome, and the control method for the hydraulic oil cylinder collision buffering system enables buffering in the first time when collision happens and is capable of reducing collision stress and prolonging fatigue life of a structural component.

Description

technical field [0001] The invention belongs to the technical field of hydraulic oil cylinders, and relates to a control method for a collision buffer system of a hydraulic oil cylinder of a rake pusher. Background technique [0002] The rake pusher adopts a hydraulic cylinder system, including 2 lift cylinders and 2 push rake cylinders. In the normal working process, the lifting cylinder is under pressure, while the force on the pushing rake cylinder is determined by the working conditions; because the pushing and raking machine is prone to collision with the cabin in the working environment such as the cabin, the lifting cylinder and the pushing and raking cylinder are in the event of a collision. All are subject to huge impact pressure, which is easy to damage the hydraulic seal and oil circuit, and the impact force transmitted to the H frame of the rake machine is easy to cause the expansion of weld cracks and cause failure. [0003] In order to prevent excessive pressu...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem that the current hydraulic cylinder collision buffer system adopts a fixed pressure relief valve that responds slowly, cannot play a buffer role when the collision pressure is small, and will cause additional torsional force, a control method for the hydraulic cylinder collision buffer system of a pusher is proposed.

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