Novel sealing structure in chain wheel assembly of scraper conveyer

Abstract

The invention discloses a novel sealing structure mode in a chain wheel assembly of a scraper conveyer. The novel sealing structure mode is characterized in that at the positions, where shaft end covers (1) are connected with bearing block glands (4), of the two symmetrical ends of the chain wheel assembly and the positions, where chain wheel transition sleeves (8) are connected with bearing blocks (10), of the two ends, movable rings (2) are fixed to the shaft end covers (1) or the transition sleeves (8) in an interference-fit mode respectively, fixed rings (5) are arranged in inner holes of the bearing block glands (4) or inner holes of the bearing blocks (10) and manufactured to be in the mode that the front faces are sealing faces, and the back faces are provided with a plurality of blind holes along the circumferences; springs (6) are installed in the blind holes of the fixed rings (5), the tail ends of the springs (6) are pressed on end pressing discs (7) or inner pressing discs (9), outer circles of the fixed rings (5) are in clearance fit with the matched inner holes, and the fixed rings (5) can freely and axially move and are isolated in a sealed mode through sealing rings (3). By means of the structure, it can be guaranteed that when the movable rings and the fixed rings are abraded, the fixed rings will be pushed through spring force to keep the constant pressure on the sealing faces of the movable rings all the time, and therefore long-time sealing and effective compensation are achieved.

Description

Technical field [0001] The invention belongs to the technical field of fully mechanized mining machinery equipment in coal mines, in particular, it relates to a new sealing structure in a sprocket assembly of a scraper conveyor. Background technique [0002] At present, the sprocket assembly is an important transmission part in the scraper conveyor equipment for fully mechanized mining equipment manufactured at home and abroad. The coal conveying process realized by the scraper conveyor is completed by the sprocket assembly installed in the nose and tail frame, that is, driven by the motor through the gearbox, the sprocket is driven to rotate, and the sprocket is driven by the rotation of the sprocket. The circular link chain and the scraper movement installed on the circular link chain realize coal transportation. The sprocket assembly is composed of sprocket shaft, high-strength bearing, sprocket and other components. The sprocket assembly is filled with liquid lubricati...

AI Technical Summary

Problems solved by technology

[0004] However, this approach has certain disadvantages

One is that in actual work, the "O" ring is in a state of extrusion for a long time, which is prone to fatigue deformation. Once the "O" ring is fatigued and deformed, it loses its driving ability, resulting in insufficient sealing pressure; The dynamic ring and the static ring are always in a state of mutual frictional motion during work. When the long-term frictional movement causes the dynamic and static rings to wear, the driving ability will be lost due to the fatigue deformation of the "O" ring, so that the wear of the dynamic and static rings cannot be achieved. The third is that the cross-sectional area of ​​the "O" ring is small and the deformation rigidity is large, that is, the ratio of thrust to deformation is high. It will lead to a sharp drop in the axial thrust of the dynamic and static rings, resulting in a time-limited compensation; Fourth, due to the influence of the deformation stiffness of the "O" ring, it is difficult to accurately control the axial thrust of the dynamic and static rings during initial assembly, and it is also difficult for the set The high-precision machining requirements of the tapered groove for the "O" ring increase the difficulty

When any of the above factors causes the seal to fail, the internal lubricating oil will leak, and at the same time, the coal dust and coal-water slurry will also enter the sprocket transmission mechanism during underground work, which will cause the speed of bearing damage to increase. Reduced bearing life and maintenance intervals in sprockets

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