Rotation control valve, rotation control system and crane

Abstract

The invention discloses a rotation control valve, a rotation control system and a crane, and relates to the technical field of engineering machinery. The rotation control valve, the rotation control system and the crane solve the technical problem that system reliability is poor in the prior art. The rotation control system comprises a first valve, a second valve and a third valve, wherein when the second valve is at a first state, the first valve is communicated with an oil tank through a first oil passage; when the second valve is at a second state, the first valve is communicated with the third valve through a second oil passage; when the third valve is at a conducting state, the third valve is respectively communicated with the second oil passage of the second valve, a first main oil circuit port and a second main oil circuit port; and when the third valve is at an off state, oil circuits of the third valve respectively communicated with the second oil passage of the second valve, the first main oil circuit port and the second main oil circuit port are cut off. The rotation control system and the crane both comprise the rotation control valve. According to the rotation control valve, the rotation control system and the crane, reliability of the rotation control system is improved.

Description

technical field [0001] The invention relates to the technical field of engineering machinery, in particular to a slew control valve, a slew control system provided with the slew control valve, and a crane provided with the slew control system. Background technique [0002] The crane boarding is mainly composed of three major motion mechanisms: the boom telescopic mechanism, the turntable slewing mechanism, and the winch lifting mechanism. [0003] Such as figure 1 As shown, the main function of the turntable turning mechanism 13 is to drive the boom 14 and the turntable 15 to rotate on the basis of the center line of the turntable 15, thereby placing the suspended weight in a desired direction. The rotary mechanism 13 of the turntable mainly consists of a rotary motor 3 and a speed reducer, and controls the rotary speed and direction of rotation of the rotary table 15 by controlling the rotation speed and steering direction of the rotary motor 3 . The control of the slewin...

AI Technical Summary

Problems solved by technology

[0020] The object of the present invention is to propose a slew control valve, a slew control system with the slew control valve and a crane with the slew control system, which solves the technical problem of poor system reliability in the prior art

In addition, the preferred technical solution of the present invention also solves the technical problems in the prior art that the slewing action is prone to delay, the slewing action is not stable, and the reliability of the slewing control system is poor.

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