Impact-resistant balance oil cylinder with pressure relief and buffer protection functions

Abstract

The invention relates to the field of hydraulic equipment, and particularly relates to an impact-resistant balance oil cylinder with pressure relief and buffer protection functions. The impact-resistant balance oil cylinder comprises a cylinder body, a piston, a piston rod, a first valve element and a second valve element, wherein the first valve element and the second valve element slide relativeto the cylinder body; a first closed air cavity and a second closed air cavity are formed between the two valve elements and the inner walls of the two opposite ends of the cylinder body correspondingly; a first closed oil cavity and a second closed oil cavity are formed between the two valve elements and the two end faces of the piston correspondingly; and a first oil cavity oil through hole anda second oil cavity oil through hole are formed in the positions, corresponding to the first oil cavity and the second oil cavity, of the cylinder body correspondingly. According to the balance oil cylinder with the buffer and pressure relief functions, a buffer device does not need to be additionally arranged for a hydraulic system of a hydraulic support independently, and the structure is simplified; when the pressure in the cylinder body is too large and a safety valve is not opened, safe and stable pressure relief is achieved through the overflow effect of oil cavity oil drainage holes; and the multi-stage buffer purpose is achieved for the oil cylinder through the cooperation effect of the high-pressure air cavities and disc springs, and the stability and reliability of the buffer process are improved.

Description

technical field [0001] The invention relates to the field of hydraulic equipment, in particular to an anti-shock balance oil cylinder with pressure relief and buffer protection. Background technique [0002] The balance jack is the key component of the cover hydraulic support to control the angle of the top beam, the resultant force of the support, and the jacking force. The layout of the balance jack directly affects the stress state and working performance of the support. When the traditional hydraulic support is subjected to the impact of the ground pressure of the roof, the balance jack will also bear a certain impact. If the load impacts, the safety valve of the balance jack will not open in time, which will cause certain damage to the balance jack or its connecting ear seat, which not only makes the balance jack of the cover type hydraulic support lose its unique function, but also directly affects the normal production in the mine and the safety of the miners. Safety...

AI Technical Summary

Problems solved by technology

When the traditional hydraulic support is subjected to the impact of the ground pressure of the roof, the balance jack will also bear a certain impact. If the load impacts, the safety valve of the balance jack will not open in time, which will cause certain damage to the balance jack or its connecting ear seat, which not only makes the balance jack of the cover type hydraulic support lose its unique function, but also directly affects the normal production in the mine and the safety of the miners. Safety

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