Electric four-clack hydraulic grab bucket

Abstract

The invention relates to an electric four-clack hydraulic grab bucket. The common electric hydraulic grab bucket is easy to cause the problems of leakage in a system and the unstable work. In the invention, a hanging ring and a disassembling buckle are connected through a pin shaft to form a hanging device of the grab bucket; the hanging device is a coupling piece of the grab bucket and a crane; a frame is arranged below the hanging device; one end of a hydraulic cylinder is fixed with the upper part of the frame through a pin shaft, and the other end of the hydraulic cylinder is fixed with claw clacks through pin shafts; the claw clacks are driven and controlled to operate through extension and retraction of the hydraulic cylinder so as to complete grabbing and putting down materials; the claw clacks are connected with the lower part of the frame through pin shafts; and an electric motor, a bidirectional hydraulic pump and a control valve block are arranged inside the frame to form ahydraulic control unit of the electric four-clack hydraulic grab bucket. In the invention, unloading pressure maintenance of the whole loop is realized by utilizing a cartridge type overflow valve; the problem of generating excessive heat of the hydraulic system is solved; and the hydraulic impact of the system is reduced due to the adoption of a cartridge type one-way valve so as to reduce the pulse influence of liquid.

Description

technical field [0001] The invention belongs to the technical field of hoisting machinery and relates to an electric four-lobe hydraulic grab bucket with its own power device. Background technique [0002] The control of the ordinary electro-hydraulic grab pump station system is pump control, which is composed of a motor, a quantitative pump, a control valve, an overflow valve, an oil pipe, and an oil cylinder. There are two main problems: one is that the quantitative pump in the grab bucket outputs a constant power, and according to the law of energy conservation, kinetic energy becomes thermal energy, and the oil temperature rises, causing a lot of noise. Even some grabs have to stop production due to the rise in oil temperature, so that the oil temperature of the grabs can drop. The rise of the oil temperature of the quantitative pump grab will have serious consequences, which will accelerate the aging of the seals and oil pipes. At the same time, the viscosity of the oi...

AI Technical Summary

Problems solved by technology

There are two main problems: one is that the quantitative pump in the grab bucket outputs a constant power, and according to the law of energy conservation, kinetic energy becomes heat energy, and the oil temperature rises, which becomes a lot of noise

The rise of the oil temperature of the quantitative pump grab will have serious consequences, which will accelerate the aging of the seals and oil pipes. At the same time, the viscosity of the oil will decrease, the leakage in the system will increase, and the work will be unstable. If the pressure cannot be maintained, the grabbed goods will fall off.

The second is that when the quantitative pump system is started, the spool inside the valve block has a certain response time, so the pressure at the moment of starting is very high, sometimes even exceeding the burst pressure of the oil pipe, and the opening and closing of the grab is controlled by the positive and negative rotation of the motor, so that Frequent instantaneous high pressure, easy to cause pipe burst and other phenomena

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