Construction machinery and its distribution system

Abstract

The invention discloses a distribution system of an engineering machine. The distribution system of the engineering machine comprises a first swinging valve oil cylinder and a second swinging valve oil cylinder which are reverse in telescopic state and are opposite to each other, wherein a piston rod extending end of the first swinging valve oil cylinder and a piston rod extending end of the second swinging valve oil cylinder are hinged to the same end of a swinging and reversing mechanism; a rodless cavity of the first swinging valve oil cylinder and a rodless cavity of the second swinging valve oil cylinder are respectively communicated with two working oil openings of a reversing valve; a rod cavity of the first swinging valve oil cylinder is connected with an oil tank through a first throttling damper; a rod cavity of the second swinging valve oil cylinder is connected with the oil tank through a second throttling damper. Through the simple structure, the vibration and shock of the distribution system in the high-speed reversing process can be effectively solved; the stability and the reliability of the system are improved; the service life is prolonged; the development and production costs are reduced. The invention also discloses an engineering machine comprising the following distribution system.

Description

technical field [0001] The invention relates to the field of construction machinery, in particular to a distribution system of construction machinery. Furthermore, the invention also relates to a construction machine comprising the above-mentioned distribution system. Background technique [0002] For most construction machinery with pumping function, the distribution system of the distribution system realizes the reversing through the telescopic control of the swing valve cylinder and the swing of the swing reversing mechanism. Please refer to figure 1 , figure 1 It is the hydraulic principle diagram of the distribution system in the prior art, including the first swing valve cylinder 1 and the second swing valve cylinder 2 which are set opposite to each other in telescopic state, so that the protruding ends of the two swing valve cylinders are hinged to the swing reversing mechanism At the same end of 3, the middle part of the swing reversing mechanism 3 is hinged with t...

AI Technical Summary

Problems solved by technology

[0005] Fast reversing is achieved through reciprocating motion in the above way. Since the reversing time is often very short, it is a typical working condition of instantaneous high pressure and large flow. During the reversing process, there will be a huge hydraulic shock, and the peak pressure caused by the shock is 3-4 times of the normal working pressure will often damage the components of the hydraulic system, and the stability and reliability of the system will also be affected. The temperature of the system will rise, causing vibration and noise, as well as loosening of the connecting parts and oil leakage. In the actual use process, there have also been failures such as fracture of the swing arm of the pumping system, fracture of the one-way valve of the swing valve cylinder, cracking of the swing cylinder base, etc., which have a lot to do with the reversing impact of the hydraulic system

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