Heightening oil cylinder applicable to high-power and large-mining-height coal mining machine

Abstract

The invention belongs to the technical field of heightening systems of high-power and large-mining-height coal mining machines for comprehensive mechanized coal mining faces of coal mines, and particularly relates to a heightening oil cylinder applicable to a high-power and large-mining-height coal mining machine. The heightening oil cylinder applicable to the high-power and large-mining-height coal mining machine mainly comprises a piston rod, a front end cap, a cylinder barrel, a piston, a rear end cap and a hydraulic lock, wherein the piston is connected with the piston rod in a self-locking threaded manner; and a rectangular limiting key is welded on the tail of the piston so that the piston can be locked. The heightening oil cylinder is simple in structure, high in bearing capacity and high in reliability. When the front end cap is connected with the cylinder barrel, the front end cap is positioned by using a guiding sleeve and is carried by a split type ring key, so that the front end cap can adapt to working conditions of large impact load and severe environments. Because a balancing valve is arranged in the hydraulic lock, the hydraulic lock has high dynamic self-adjusting characteristics, the stress state of the oil cylinder can be effectively improved, the problems that when a rocker arm descends, system pressure is high, descending speed is low, the rocker arm shakes and the like in the prior art are solved, and an overload protecting function is fulfilled.

Description

Technical field [0001] The invention belongs to the technical field of a high-power high-height shearer height adjustment system for a coal mine's fully mechanized mining face, and specifically relates to a height-adjusting oil cylinder suitable for a high-power large-height shearer. Background technique [0002] The existing shearer height adjustment cylinder is mainly composed of piston rod, front end cover, cylinder tube, piston baffle, piston, lock nut, back end cover, hydraulic lock, etc. (attached Figure 5 ), the outer end of the piston rod is hinged with the rocker arm with a round double earring, the end of the cylinder barrel is connected with the frame through a shaft pin with a round single lug; the front end cover of the height-adjusting cylinder and the cylinder barrel are connected by internal thread; The end cover and the cylinder barrel are connected by welding; the piston adopts a combined structure, and the piston rod is locked with a nut; the end of the cylinder...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to address the shortcomings of existing height-adjusting oil cylinders, and to propose a height-adjusting oil cylinder suitable for high-power and high-height coal mining machines

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