Hydraulic system of crane

Abstract

The invention provides a hydraulic system of a crane. The hydraulic system of the crane comprises a crane body, wherein a main arm is fixed at the upper part of the crane body; a hydraulic oil tank isfixed on the side of the crane body; a motor and a one-way throttle valve are mounted at the top of the hydraulic oil tank; a gear pump is arranged inside the hydraulic oil tank; an S-shaped coolingpipe is arranged under the gear pump; the gear pump is connected with the motor through a coupler; the gear pump is connected with the one-way throttle valve through a hydraulic oil pipe; an oil storage tank is arranged on the hydraulic oil tank; a filtering net is arranged between the oil storage tank and the hydraulic oil tank; the oil storage tank is connected with an oil returning pipe; a balancing valve is mounted in the oil returning pipe; a cooling water tank is also fixed on the side of the crane body; a water pump is arranged in the cooling water tank; a booster pump communicated withthe cooling water tank is arranged on the side of the cooling water tank; a water pump is communicated with a water inlet of the S-shaped cooling pipe through a pipeline. According to the hydraulic system of the crane, the S-shaped cooling pipe is used for cooling the hydraulic oil, so that the problem that the temperature of the hydraulic oil is increased to an excessively high temperature whenthe crane carries out the hoisting operation for a long time is solved.

Description

technical field [0001] The invention belongs to the technical field of hydraulic systems, and in particular relates to a hydraulic system of a crane. Background technique [0002] Truck crane is a kind of widely used construction machinery. This kind of machinery can travel at a relatively fast speed. Transportation, urban construction, fire protection, large material yards, infrastructure, first aid and other fields have been widely used; when the crane is working, it relies on four hydraulic couplings to lift the entire car, and unfolds various parts of the crane for lifting operations , due to the relatively simple actions to be completed by the actuators of the hydraulic system and the low position accuracy requirements, the reliability and safety of the hydraulic system are the most important for the hydraulic system of the hoisting machinery. [0003] However, the hydraulic system currently on the market still has certain defects during the lifting operation of the cr...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a new hydraulic system of a crane to solve the problem that the temperature of the hydraulic oil rises too high during the long-term lifting operation of the crane in the above background technology, which makes the sealing ring invalid and increases the leakage of the hydraulic system. Reduce the speed of the lifting operation, which affects the normal operation of the crane. In addition, when the crane is performing lifting operations, the hydraulic cylinder moves the piston, and the return oil directly enters the hydraulic oil tank through the pipeline, which will easily cause oil pollution to follow the hydraulic oil into the hydraulic oil tank, causing hydraulic pressure. The oil is impure, causing blockage of the hydraulic oil pipe and affecting the normal operation of the hydraulic system

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