Crane and its hydraulic control system of single-cylinder plug-type telescopic mechanism

Abstract

The invention discloses a single-cylinder plug pin type extension and retraction mechanism hydraulic control system, which is used for controlling the outward extension and backward retraction operation of an extension and retraction cylinder. The single-cylinder plug pin type extension and retraction mechanism hydraulic control system comprises a first hydraulic pump, a direction control main valve and an electric control proportional valve group, wherein the first hydraulic pump is communicated with a main pressure oil path, the direction control valve is arranged among the extension and retraction cylinder, the main pressure oil path and an oil return oil path for controlling the oil inlet of a rod cavity and a rodless cavity of the extension and retraction cylinder, an oil inlet of the electric control proportional valve group is communicated with a pilot oil path, an oil return opening of the electric control proportional valve group is communicated with the oil return oil path, and two oil outlets of the electric control proportional valve group are respectively used as two end parts of a valve core of the direction control main valve for the work position and the opening degree of the direction control main valve. The hydraulic control system provided by the invention has the advantages that the defect of limitation of a single-cylinder plug pin type extension and retraction mechanism on the control mode of a crane is overcome, the cost of a crane control system is reduced, and the stability of the system is improved. The invention also discloses the crane adopting the single-cylinder plug pin type extension and retraction mechanism hydraulic control system.

Description

technical field [0001] The invention relates to the technical field of engineering machinery, in particular to a crane and a hydraulic control system of a single-cylinder bolt type telescopic mechanism thereof. Background technique [0002] At present, for cranes with five-section booms and below, rope-type telescopic mechanisms are generally used, and mechanical or hydraulic control pilot control systems are used, which have high reliability and low cost; for telescopic booms with six-section booms and above As far as the crane is concerned, the rope-type telescopic mechanism is more complicated, and the single-cylinder bolt-type telescopic mechanism is mostly used, but the single-cylinder bolt-type telescopic mechanism has low efficiency and complicated operation, and requires high experience and proficiency of the operator. [0003] In order to improve the operability of the single-cylinder bolt-type telescopic mechanism, the usual practice is to increase the automatic te...

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Problems solved by technology

[0002] At present, for cranes with five-section booms and below, rope-type telescopic mechanisms are generally used, and mechanical or hydraulic control pilot control systems are used, which have high reliability and low cost; for telescopic booms with six-section booms and above For cranes, the rope-type telescopic mechanism is more complicated, and single-cylinder bolt-type telescopic mechanism is mostly used, but the efficiency of single-cylinder bolt-type telescopic mechanism is low, the operation is complicated, and the operator's experience and proficiency are required.

[0003] In order to improve the operability of the single-cylinder bolt-type telescopic mechanism, the usual practice is to increase the automatic telescopic function of the boom. In order to realize this function, the electric proportional control technology must be used, which makes it difficult for the single-cylinder bolt-type telescopic mechanism to operate in pure It is applied in the hydraulic control system of hydraulic control pilot proportional control. Therefore, the existing cranes with telescopic booms of six sections or above mostly use electric proportional control system, but this control method has poor anti-interference ability and high cost.

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