Buffer control system and method of slewing mechanism and crane

Abstract

The invention discloses a buffer control system of a swing mechanism, a buffer control method and a crane, and relates to the field of engineering machinery. According to the invention, on one hand, an electric proportional overflow valve is adopted, the pressure set value of the overflow valve is changed via changing the control current of the electric proportional overflow valve, the dynamic variation of the buffer pressure of the overflow valve is realized, and the electric proportional overflow valve can be adaptive to the buffer requirement of different loads, for example, under the working conditions of low hoisting weight, slow stop of swinging and the like, the pressure set value can be reduced by changing the control current of the electric proportional overflow valve, so that a relatively good swing buffer effect can be obtained under the working conditions, and on the other hand, a valve core of a reversing valve can be controlled to reverse by adopting a proportional electromagnetic valve; the pressure of a control opening can be released slowly according to the setting of the proportional electromagnetic valve so as to achieve the buffer effect of stopping buffer, and especially when the external control oil source pressure and the flow rate variation are relatively high, the stability of swing stop can be improved.

Description

technical field [0001] The invention relates to the field of engineering machinery, in particular to a buffer control system and method for a slewing mechanism and a crane. Background technique [0002] The crane boarding is mainly composed of four moving parts: the boom telescopic mechanism, the boom luffing mechanism, the turret slewing mechanism, and the winch lifting mechanism. The turret slewing mechanism is referred to as the slewing mechanism. The main function of the turntable slewing mechanism is to drive the turntable and the boom to rotate based on the center line of the turntable, so as to place the hoisted objects in the desired direction. The rotary mechanism of the turntable is mainly composed of a motor and a brake (also called a reducer), and the control of the rotary speed and direction of the rotary table is realized by controlling the speed and steering of the motor. [0003] refer to figure 1 The schematic diagram of the principle of the slewing mechan...

AI Technical Summary

Problems solved by technology

[0007] One of the technical problems to be solved by the embodiment of the present invention is: the buffering effect of the slewing is not ideal under some working conditions such as small crane weight, slewing slow stop, etc.

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