Hoist motor closed type hydraulic system for preventing pipelines from bursting and control method thereof

Abstract

The invention provides a hoist motor closed type hydraulic system for preventing pipelines from bursting, comprising a hoist motor, a rising oilway and a descending oilway thereof, and a closed type pump serially arranged in the oilways thereof; a brake and a braking electromagnetic valve are connected; the oilways of the hoist motor is connected with the oil supplementing oilways and oil supplementing pumps, oil sump tank and oil sump oilways of the braking electromagnetic valve; a pipeline bursting prevention device comprises a two-way cartridge inserted valve and a reversing valve; the two-way cartridge inserted valve is arranged in the oilway between the hoist motor and the closed type pump, the two ports: B-port and A-port are respectively corresponding to the oilway between the hoist motor and the closed type pump; the reversing valve is respectively connected with B-port and C-port by the pipelines, G-port of the reversing valve is connected with the descending oilway of the hoist motor, and T-port is connected with the oil sump tank. In the invention, the starting of the hydraulic control reversing valve is controlled by the pressure of the closed type system oil supplementing oilways, and a security overflow valve is arranged in the oil sump oilways for preventing the pressure of the rising port of the hoist motor from being too high to protect the hoist motor.

Description

technical field [0001] The invention relates to a safety system of a hydraulic crane, in particular to a closed-type hydraulic system of a winch motor for preventing pipeline burst and a control method thereof. Background technique [0002] At present, in the field of engineering cranes, the hydraulic system of the crane winch (including hoisting and luffing) usually adopts an open circuit, and installing a balance valve on the winch motor can solve the problem of stable load drop and prevent pipeline bursting. However, in large-tonnage lifting equipment, if the open circuit continues to be used, there will be problems such as low system efficiency, serious heat generation, large fuel tank volume, and poor running stability. [0003] The above problems can be well solved by adopting closed circuit in large tonnage lifting equipment. However, because a balance valve cannot be installed on the motor of the closed system, the closed hydraulic system of the hoist motor of the h...

AI Technical Summary

Problems solved by technology

However, because a balance valve cannot be installed on the motor of the closed system, the closed hydraulic system of the hoist motor of the hydraulic crane at home and abroad is not equipped with a hydraulic anti-pipeline blasting device. If the pipeline blasts, it can only rely on the parking brake for dynamic braking

However, the dynamic braking effect of the parking brake is very poor, and it is very easy to burn out during dynamic braking. Therefore, if the hose bursts when lifting heavy objects, it is likely to cause a safety accident in which the heavy objects fall to the ground.

Even if the heavy object is stopped after the brake friction burns out, it will be difficult to put the heavy object down while hovering in the air, which will cause new problems

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