Anti-impact control method for load sensitive system and winch system

Abstract

The invention discloses an anti-impact control method for a load sensitive system and a winch system and relates to the technical field of engineering machinery. The anti-impact control method is used for fundamentally reducing impact in starting and stopping operations of the load sensitive system and the winch system. The load sensitive system comprises a variable pump, a variable pump oil inlet passage, a load feedback passage, an oil return passage and a pressure compensator. The pressure compensator is provided with an oil inlet, an oil outlet, a first control oil opening, a second control oil opening and a control spring. The oil inlet is communicated with the variable pump oil inlet passage. The oil outlet is communicated with the oil return passage. The first control oil opening is communicated with the load feedback passage. The second control oil opening is also communicated with the variable pump oil inlet passage. The control spring and the first control oil opening are located at the same end of the pressure compensator, and the set pressure of the control spring is larger than the differential pressure of the variable pump. According to the technical scheme of the load sensitive system, the starting and stopping pressure impact of the winch system can be reduced fundamentally.

Description

technical field [0001] The invention relates to the field of engineering machinery, in particular to a load sensitive system and a hoisting system anti-shock control method. Background technique [0002] Load Sensing System: The load pressure signal is fed back to the hydraulic system, and the system can automatically adjust the pressure and flow parameters to meet the operating requirements of the system. [0003] The variable pump load sensing system is widely used in the design of mobile cranes because of its high comprehensive performance. The system can feed back the pressure signal required by the load to the variable pump. The variable pump automatically adjusts the swash plate angle to realize the displacement change, so that the output flow of the variable pump matches the flow required by the system at all times, so there is no excessive overflow. Flow loss, good energy saving, and good control performance. [0004] Since the central position P port of the main v...

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Problems solved by technology

2. When the winch stops moving, the excessively high pressure shock will affect the closing time of the brake, resulting in a mismatch between the brake control and the system operation, resulting in friction and abnormal noise.

[0006] At present, in order to reduce the impact of pressure shock on the smoothness of the winch system, it is generally necessary to design a more complex balance valve control end cover

This method increases the design cost. Although the impact of the pressure shock on the handling performance is alleviated to a certain extent, it cannot fundamentally reduce the pressure shock

[0007] The inventors found that there are at least the following problems in the prior art: in the prior art, a complex balance valve is used to control the end cover to reduce the impact of the start and stop pressure of the hoisting mechanism, the design cost is high, there are many adjustment parameters, and the professional requirements are high

In addition, it is impossible to fundamentally reduce the impact of the load-sensitive winch system starting and stopping operations.

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