Crane

Abstract

The invention discloses a crane comprising a balanced valve serially connected to a winch oil path. Control oil is acted on a valve core through a damping channel; the crane also comprises a plugging component synchronously moving along with the valve core, and an additional channel; the control oil can be acted on the valve core through the additional channel; and the additional channel is gradually plugged by the plugging component in the process of opening a throttling channel of the balanced valve. At the initial phase that the throttling valve is opened, the control oil is acted on the valve core through the additional channel, thus the response speed is high and the operation is basically not delayed. The additional channel is gradually plugged by the plugging component along with the movement of the valve core; at the time, the control oil can be acted on the valve mainly or completely through the damping channel, thereby effectively avoiding the jitter generated in the shift process of the valve core. The crane not only can effectively avoid the jitter generated in the falling process of heavy objects, but also can avoid the operation delay.

Description

technical field [0001] The invention relates to the technical field of engineering machinery, in particular to a crane. Background technique [0002] With the continuous maturity of related technologies in the field of construction machinery, users' requirements for cranes are no longer limited to lifting performance, and other performances including operation micro-movement are getting more and more attention from users. [0003] In the process of lifting heavy objects, good operation micro-movement can make the operation process more stable, which is conducive to improving operation safety and comfort; in the process of lowering heavy objects, operation micro-movement is particularly important. [0004] During normal operation, the crane uses a hydraulic motor to drive the winch to rotate, and realizes the lifting or lowering of the heavy objects it is hoisting by winding or releasing the wire rope. In order to ensure the safety of the operation, a balance valve can usual...

AI Technical Summary

Problems solved by technology

If the above-mentioned through hole is too large, it is difficult to play the role of reducing vibration; however, if the above-mentioned damping hole is too small, the existence of the above-mentioned damping hole will obviously cause a delay in operation at the initial stage of opening the balance valve

Avoiding jitter and avoiding operation delay have different requirements for through-holes. In fact, the performance of existing balancing valves in avoiding jitter and avoiding operation delay is not satisfactory.

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