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

Abstract

The invention discloses a hydraulic oil cylinder. A buffer sleeve capable of sliding along the axial direction of a piston rod additional section is sleeved on the piston rod additional section in a rodless cavity; a rodless cavity hermetic end face which can be used for blocking the buffer sleeve and can be jointed with the first end face of the buffer sleeve to form a sealing surface is arranged in an oil cylinder cavity between a rodless cavity oil flow hole and a final position of the piston rod in retracting movement in a piston rodless cavity end face; at least one throttling oil channel is formed; and in the retracting movement process of the piston rod, hydraulic oil on one side of the sealing surface close to a piston can flow towards the rodless cavity oil flow hole through the throttling oil channel from the moment when the first end face of the buffer sleeve is jointed with the rodless cavity hermetic end face and the sealing surface is formed to the moment when the pistonrod retracts to the final position in the retracting movement. The hydraulic oil cylinder has the advantages of easiness in machining of a buffer structure and good effect. The invention also provides a hydraulic buffer system using the hydraulic oil cylinder, an excavator and a concrete pump truck.

Description

[0001] This application is the division of the Chinese patent application filed with the Chinese Patent Office on July 23, 2010, the application number is 201010235136.2, and the invention title is "a hydraulic cylinder and its related devices, and a hydraulic buffer system, excavator and concrete pump truck". The entire content of the case application is incorporated into this application by reference. Technical field [0002] The invention relates to the technical field of hydraulics, in particular to a hydraulic cylinder. The present invention also provides related devices for the above-mentioned hydraulic cylinder, a hydraulic buffer system using the hydraulic cylinder, and an excavator and a concrete pump truck using the hydraulic cylinder. Background technique [0003] The hydraulic cylinder is a widely used component in construction machinery. During its work, the piston needs to reciprocate continuously. When the piston rod extends to the extreme position, the end face of...

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 achieve

Due to the above-mentioned high requirements for manufacturing precision, hydraulic cylinders with large strokes and large bores have become bottlenecks in the production of construction machinery such as excavators, severely limiting the production capacity of various downstream manufacturers.

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