Electro-hydraulic union speed adjustment rotary system for crane and control method

Abstract

The invention discloses an electro-hydraulic union speed adjustment rotary system for a crane and a control method. The electro-hydraulic union speed adjustment rotary system comprises a hydraulically controlled handle, an adjustment and control system, a rotary control valve, a rotary motor and a cargo boom. The rotary work is adjusted and controlled through steps of detecting the state of the hydraulically controlled handle and comparing output pressure of the hydraulically controlled handle with a set value of a pressure relay. The electro-hydraulic union speed adjustment rotary system is obvious in effect, convenient and practical; when the handle is quickly pressed or reset, impact caused by sudden start and stop can be effectively reduced, and the operation comfortableness is improved; shaking of a heavy object in sudden start and stop is reduced, and the safety is improved; the shaking of the heavy object is reduced, so that the load impact is reduced, and the service life of the whole machine is prolonged.

Description

technical field [0001] The invention relates to a slewing system, which belongs to the field of engineering machinery, in particular to an electro-hydraulic combined speed-regulating slewing system for a crane and a control method. Background technique [0002] At present, the small and medium tonnage cranes generally adopt the full hydraulic pilot control mode, which has the advantages of low cost, simple control, high reliability and convenient maintenance compared with large tonnage electric control. However, according to the continuous improvement of market users' requirements for operating accuracy and operating comfort, some shortcomings are also reflected: because the hydraulic control pilot handle is completely controlled by manual control, the control method is relatively simple, the control curve is difficult to adjust, and the control is not flexible; for special The pilot operating system cannot meet the application requirements and different operating habits. D...

AI Technical Summary

Problems solved by technology

However, according to the continuous improvement of market users' requirements for operation accuracy and operation comfort, some shortcomings are also reflected: because the hydraulic control pilot handle is completely controlled by manual control, the control method is relatively simple, the control curve is difficult to adjust, and the control is not flexible; for special The pilot operating system cannot meet the application requirements and different operating habits

When turning, the handle quickly returns to the neutral position, and the action stops quickly, causing the whole vehicle to shake, which affects the smoothness, comfort and safety of the operation.

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