Superstructure rotary hydraulic control system and crane with same

Abstract

The invention discloses a superstructure rotary hydraulic control system, which comprises a first direction control valve and a variable backpressure element, wherein the direction control valve is arranged between a rotating motor and system pressure and system oil return oil circuits, the variable backpressure element is arranged between an oil return port of the first direction control valve and the system oil return oil circuit, and the first direction control valve is in one-way communication with the variable backpressure element. Compared with the prior art, the superstructure rotary hydraulic control system has the advantages that when the moment of resistance is higher in rate of change under the operating conditions of rotation starting and stopping, oil return pressure of the variable backpressure element can be increased by adjusting the variable backpressure element, and accordingly system rigidity can be improved to overcome pressure impact under the operating conditions of starting and stopping, and improvement of rotating performance and overall stability is guaranteed reliably. Meanwhile, since the system oil return oil circuit is provided with a fixed backpressure constantly, system rigidity is improved correspondingly, and high impact resistance can be achieved in the whole superstructure rotation process. The invention further provides a crane with the superstructure rotating hydraulic control system.

Description

technical field [0001] The invention relates to engineering machinery technology, in particular to a hydraulic control system for boarding and slewing and a crane with the hydraulic control system. Background technique [0002] For construction machinery where the upper vehicle rotates relative to the chassis, the stability of the starting and braking of the slewing mechanism is one of the important indicators of the performance of the whole machine. research and development hotspots. For example: the hydraulic control system of the crane's upper slewing. [0003] At present, with the rapid development of economic construction, the scale of infrastructure such as road traffic, airports, ports, water conservancy and hydropower, and municipal construction is also increasing, and the demand for lifting machinery in the market is also increasing. As we all know, in the process of crane operation, it is necessary to change the space of the hoisted object through the actions of ...

AI Technical Summary

Problems solved by technology

[0007] However, in the process of starting and stopping the slewing motion, due to the system from static to motion or from motion to static, there is a clearance between the slewing reducer and the slewing support gear, and the boom and the turntable are rigidly connected, and the weight and the boom The steel wire rope is flexibly connected, which is like a single pendulum, so the change rate of the resistance torque is relatively large during the turning start and stop process, and the impact of the system is relatively large.

That is to say, the slewing hydraulic control system cannot avoid the impact during the slewing start and stop process; especially, when lifting large-tonnage heavy objects, the impact is more serious at the moment of start and stop, which can easily cause hydraulic pipelines The hydraulic shock will reduce the service life of the relevant hydraulic components, and even the whole vehicle will shake due to the vibration of the slewing system, thus affecting the stability of the whole vehicle

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