Hydraulic oil cylinder and related devices of hydraulic oil cylinder, and hydraulic buffer system, excavator and concrete pump truck

Abstract

The invention discloses a hydraulic oil cylinder comprising a rod cavity end cover, a cylinder barrel, a piston rod, a piston and a rodless cavity end cover, wherein an inner cavity of the hydraulic cylinder barrel is divided into a rod cavity and a rodless cavity by the piston rod and the piston, a buffer jacket is arranged on the piston rod and comprises a first baffle jacket and / or a second buffer jacket, the buffer jacket can slide axially along the piston rod, and an axial throttling oil duct is arranged between the buffer jacket and the piston rod, the first buffer jacket is provided with a sealing end surface, a sealing end surface is arranged on a rod cavity end cover, hydraulic oil in the rod cavity passes through the throttling oil duct and is drained to the oil duct; the end surface of the second buffer jacket is contacted with a sealing end surface of the rodless cavity end cover to form sealing, and hydraulic oil in the rodless cavity passes through the throttling oil duct and is drained to the oil duct; a buffer mechanism of the hydraulic oil cylinder in the invention has long service life; moreover, the requirement to the manufacturing precision is low and the organizing production is convenient.

Description

[0001] This application is a branch of a Chinese patent application submitted to the China Patent Office on July 23, 2010, with the application number 201010235138.1, and the title of the invention is "a hydraulic cylinder and its related devices, and hydraulic buffer system, excavator and concrete pump truck". application, the entire contents of which are incorporated in this application by reference. technical field [0002] The invention relates to the field of hydraulic technology, in particular to a hydraulic oil cylinder. The invention also provides a hydraulic buffer system, an excavator and a concrete pump truck used for the hydraulic oil cylinder. Background technique [0003] The hydraulic cylinder is a widely used part in construction machinery. During its working process, the piston needs to reciprocate continuously. When the piston rod extends to the limit position, the end face of the piston will have a great impact on the end cover, which may cause damage to ...

AI Technical Summary

Problems solved by technology

At this time, the large buffer sleeve 04 in the above-mentioned buffer mechanism needs to be repeatedly inserted into the buffer inner hole 07 at high speed, and the fit gap between the two is originally very small, and the piston rod 03 is very heavy. It is easy to tilt to one side; therefore, the hydraulic cylinder used in the above occasions is prone to failure of the buffer mechanism that the buffer sleeve 04 cannot be inserted into the buffer inner hole 07, resulting in the failure of the entire hydraulic cylinder.

[0008] Another key problem of the above-mentioned buffer mechanism is that the outer diameter of the large buffer sleeve 04 must precisely match the inner diameter of the buffer inner hole 07, otherwise the buffer effect cannot be achieved; this results in extremely high manufacturing precision requirements for the buffer mechanism , the manufacturing level of general manufacturers is difficult to meet the requirements

Due to the above-mentioned high requirements for manufacturing precision, hydraulic cylinders with large strokes and large bores have become a bottleneck in the production of excavators and other construction machinery, which seriously limits the production capacity of various downstream manufacturers.

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