Hydraulic center rotary joint

Abstract

The invention relates to a hydraulic center rotary joint characterized in that the lower end of a rotary shaft (2) is axially inserted into a rotary body (1) from the upper end of the rotary body (1), seven main oil-way holes and a center oil drainage hole are axially formed in the rotary shaft (2), seven main oil ports are radially formed in the rotary body (1) to be correspondingly communicated with the seven main oil-way holes in the rotary shaft (2), a dustproof ring (12) is arranged in a circular groove between the rotary body (1) and the rotary shaft (2), an upper lip and a lower lip (12.1) are arranged on one side of the dustproof ring (12) contacting with the rotary shaft (2) to form double lips, and the upper lip and the lower lip (12.1) are attached to the outer wall of the rotary shaft (2). According to the hydraulic center rotary joint, dust is not prone to entering, oil is not prone to leakage, fixed parts of a hydraulic system and a circuit can rotate 360 degrees relative to rotary parts. Besides, the upper portions and the lower portions of oil-ways are communicated, and the oil-ways and the circuit are not connected in serial.

Description

technical field [0001] The invention relates to a hydraulic central rotary joint, which is mainly used in hydraulic systems of large-tonnage excavators, cranes, graders, tower cranes and other machinery, and is a hydraulic pipeline and circuit connecting the fixed part and the rotating part of the entire hydraulic system and circuit The connector belongs to the technical field of engineering machinery. Background technique [0002] For hydraulic excavators, cranes, loaders, etc., the upper and lower parts need to be rotated, so there is a problem of connecting the oil circuit and the circuit between the rotating part and the fixed part. The hydraulic central rotary joint is composed of a rotary body, a rotary shaft and a cover. When in use, the revolving body is fixed to the revolving lower platform of hydraulic excavators and cranes, and the mounting plate on the revolving shaft is connected with the slewing support on the revolving upper platform. Hydraulic rubber hoses ...

AI Technical Summary

Problems solved by technology

[0003] However, the sealing performance between the rotary joint and the outside world in the past is poor, and the dust from the outside is easy to get into the rotary joint, which affects the performance of the rotary joint, and the oil in the rotary joint is also easy to leak out. The rotation also has an impact, requiring frequent oiling, which increases the labor intensity of the workers

[0004] Moreover, after the conventional hydraulic central rotary joint connects the hydraulic pipeline and circuit of the fixed part and the rotating part in the hydraulic system and the circuit, the fixed part and the rotating part cannot be rotated 360° relative to each other, resulting in interference between the pipeline and the circuit, and the oil on the oil circuit , the lower is not smooth, each oil circuit and circuit action are connected in series

Images