Buffer unit and boom rearward tilting prevention device provided with buffer unit

Abstract

The invention discloses a buffer device which comprises a piston cylinder. The piston cylinder comprises a cylinder body (1), a piston (2) arranged in the cylinder body (1) and a piston rod (3) fixed on the piston (2); the piston (2) divides the space in the cylinder body (1) into a rod-free cavity (11) and a rod cavity (2); and within the travel range of the piston rod (3), the rod-free cavity (11) and the rod cavity (12) form a closed loop through a connecting pipeline, and a damping part is arranged on the connecting pipeline. The invention also discloses a boom reward tilting prevention device; the boom (100) is hinged on a support (200); and the reward tilting prevention device comprises the buffer device; and the piston cylinder is installed between the boom (100) and the support (200). According to the buffer device with a closed system, untimely oil absorption can not be caused, components can not be damaged easily, the noise is low, the vibration is small and stable the buffering performance is stable.

Description

technical field [0001] The present invention relates to the field of engineering machinery, in particular to an anti-backward device for a large boom of an engineering machine, and more particularly to a buffer device in the anti-backward device. Background technique [0002] The anti-backward dynamic buffer device for large-scale jibs of construction machinery provides back-tilt protection for large-scale truss arms, box-type jibs and other jibs (such as crane jibs) in construction machinery under large impact loads. [0003] The existing anti-backward device usually adopts a spring buffer device, a hydraulic buffer device or a spring-hydraulic combined buffer device. In the existing hydraulic buffer devices, a simple and easy-to-implement open hydraulic system is usually used. Existing hydraulic buffer devices generally include a piston cylinder, which includes a cylinder body, a piston disposed in the cylinder body and a piston rod fixed on the piston, and the piston sep...

AI Technical Summary

Problems solved by technology

In the existing buffer device of this kind of open hydraulic system, because the oil inlet of the hydraulic system mainly adopts the way of forming negative pressure at the oil suction port to suck the hydraulic oil in the oil tank into the hydraulic cylinder, when the piston rod moves quickly It will cause the phenomenon that the hydraulic oil is not absorbed in time, which will cause damage to the hydraulic components

In addition, the vibration and noise generated by the buffer device of the open hydraulic system are relatively large, and the buffer performance is unstable.

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