Rotary system and crane

Abstract

The invention discloses a rotary system and a crane, relates to the field of engineering machinery and is used for optimizing the performance of an existing crane rotary control system. The rotary system comprises a working oil pump, a micro oil pump, a rotary reversing valve and a changeover valve; the working oil pump is used for providing working pressure oil for the rotary reversing valve, and the working pressure oil flows to a rotary motor so as to realize the working steering of the rotary motor; the micro oil pump is used for providing micro pressure oil for the rotary reversing valve, the micro pressure oil flows to the rotary motor so as to realize the micromotion of the rotary motor; when the changeover valve is in an electric state, only the micro pressure oil provided by the micro oil pump can flow to the rotary motor; when the changeover valve is in a power-loss state, only the working pressure oil provided by the working oil pump can flow to the rotary motor through the rotary reversing valve. According to the technical scheme, the micro control of the rotary motor can be realized.

Description

technical field [0001] The invention relates to the field of engineering machinery, in particular to a slewing system and a crane. Background technique [0002] The slewing mechanism is one of the important executive mechanisms for lifting heavy objects in construction cranes. It is used to drive the upper part of the crane to slew and undertake functions such as item transfer, requiring high safety and stability. [0003] The crane slewing control system generally consists of a hydraulic circuit consisting of a pump, a slewing motor, and a slewing buffer valve. In the actual use process, due to the complex operating environment of the crane and the large moment of inertia of the upper vehicle, the hoisted load is shaken by external interference or the influence of its own factors such as the manufacturing accuracy of structural parts and assembly errors during the rotation of the slewing mechanism. Cause fluctuations in load pressure. [0004] It is difficult for the exis...

AI Technical Summary

Problems solved by technology

[0012] The inventors found that there are at least the following problems in the prior art: in the existing solutions, the micro-control of the rotation is basically controlled by the handle, which is largely affected by the operating proficiency of the operator

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