Self-locked hydraulic centre

Abstract

The invention provides a self-locked hydraulic centre. A piston has '0' displacement when a live centre is pressed by an external force (the external force is within the designed maximum bearing forcerange). Self-locking for the centre under the condition of the external force is realized. A cylinder rod connecting piece in the self-locked centre is connected with a centre fixing sleeve through ascrew, and the centre fixing sleeve and a sliding cylinder are connected through a screw after the cylinder rod connecting piece penetrates into the sliding cylinder; and a limiting groove is formedin the outer diameter of the sliding cylinder. A limiting screw penetrates through a centre seat and then enters the limiting groove in the outer diameter of the sliding cylinder. An oil cylinder piston rod stretches out and then penetrates through the sliding cylinder to be connected with the live center and the oil cylinder through a pin shaft, and a cotter pin is inserted into the tail end of the pin shaft to prevent the pin shaft from disengaging; a screw is screwed into the tail end of the oil cylinder for fixing, an oil cylinder rear flange and the centre seat are fixed together, and theoil cylinder piston rod is withdrawn; and a calibration ring is fixed at the front end of the live center. Scales are arranged on the circumference of the calibration ring and used for aligning the center position when the self-locked hydraulic centre is integrally used.

Description

Technical field: [0001] The invention belongs to the technical field of equipment manufacturing, in particular to a self-locking hydraulic tip. Background technique: [0002] The tip is an indispensable tool for processing or testing shaft parts. As the requirements for shape tolerance, linear tolerance and cylindricity are getting higher and higher, the reliability (absolute position) of the tip is extremely important. The precision of processing or testing shaft equipment is related to the inherent characteristics of its own structure, and the inherent structural characteristics of the body are closely related to the characteristics of the top. The existing manual top relies on thread transmission to realize the telescopic and locking of the top; the hydraulic type relies on the hydraulic lock in the hydraulic system to lock the expansion of the oil cylinder; the thread type has low efficiency and is not easy to realize automation. Its own processing accuracy, and valve p...

AI Technical Summary

Problems solved by technology

The existing manual top relies on thread transmission to realize the telescopic and locking of the top; the hydraulic type relies on the hydraulic lock in the hydraulic system to lock the expansion of the oil cylinder; the thread type has low efficiency and is not easy to realize automation. Due to its own machining accuracy and leakage of valve parts such as hydraulic locks in the control system, the accuracy of the position cannot be achieved, resulting in large shape and position tolerances of the processed parts

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