Pre-tightening slewing device

Abstract

The invention provides a pre-tightening slewing device. The pre-tightening slewing device comprises a slewing part (10), a connecting piece (60), a pre-tightening spring cylinder assembly, a telescopic oil cylinder (30) and a fixed seat (40), the rotating part (10) comprises a rotating wheel (11) and a rotating wheel mounting frame (12); the connecting piece (60) comprises a connecting frame (61) and a plurality of connecting shafts (62), the connecting frame (61) is provided with a plurality of shaft holes, the connecting shafts (62) are arranged in the shaft holes in a one-to-one correspondence mode, and the rotating wheel mounting frame (12) is connected with the connecting frame (61) through at least one connecting shaft (62); the pre-tightening spring cylinder assembly is connected with the connecting frame (61) through at least one connecting shaft (62). The telescopic oil cylinder (30) is connected with the pre-tightening spring cylinder assembly; and one end of the telescopic oil cylinder (30) is fixed on the fixed seat (40). The pre-tightening slewing device has the advantage of reliable and stable connection.

Description

technical field [0001] The invention relates to the technical field of cable dragging, in particular to a pretensioning rotary device. Background technique [0002] At present, the towing method of the shearer in the fully mechanized mining face of the coal mine is that the cable is moved by the towing frame of the coal mining machine. This method of towing is affected by the coal mining process, and cable splints may appear in some positions of the working face In the case of multiple bending and stacking of multiple layers, once the bending radius is smaller than the bending radius of the cable due to the influence of the structural size, it is easy to break and damage the cable. Especially in the thin coal seam working face, because the height of the cable splint of the conveyor cable trough is limited by the matching size, this size often only meets the requirements of three layers of cables stacked or two bends. More than three layers will break the cable, thus affectin...

AI Technical Summary

Problems solved by technology

[0002] At present, the towing method of the shearer in the fully mechanized mining face of the coal mine is that the cable is moved by the towing frame of the coal mining machine. This method of towing is affected by the coal mining process, and cable splints may appear in some positions of the working face In the case of repeated bending and multi-layer stacking, once the bending radius is smaller than the bending radius of the cable due to the influence of the structural size, it is easy to break and damage the cable

Especially in the thin coal seam working face, because the height of the cable splint of the conveyor cable trough is limited by the matching size, this size often only meets the requirements of three layers of cables stacked or two bends. More than three layers will break the cable, thus affecting normal coal mining

[0003] The pre-tightening device in the prior art has the problems of complex structure, unstable connection, inability to adjust the pre-tightening force, and troublesome maintenance of damage

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