Machine element or mechanism – Mechanical movements – Oscillation or reciprocation to intermittent unidirectional...
Patent
1984-08-16
1987-01-06
Staab, Lawrence
Machine element or mechanism
Mechanical movements
Oscillation or reciprocation to intermittent unidirectional...
74148, 74157, 74169, 299 43, 105 291, F16H 2702, E21C 2902
Patent
active
046337237
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to the mining industry, and more particularly to a chainless displacement or feed system of a mining machine, e.g. a mining cutter-loader.
BACKGROUND OF THE INVENTION
There is known a chainless displacement system for a mining machine (see, for example, UK Pat. No. 1,529,516; Cl. E1F 17; Int.Cl..sup.2 E21C 29/02), comprising a guiding rack mounted on the working-face conveyer.
The guiding rack permanently meshes with a pair of gears rotatably mounted on the mining machine, the gears being mounted on the mining machine in pairs, secured on shafts rotatable therewith relative to the mining machine. The gears are operatively connected through the rotating mechanism with hydraulic cylinders adapted to actuate the gears for rolling along the rack.
The rotating mechanism of each gear includes toothed racks secured on the ends of the piston rods of the hydraulic cylinders and extending axially of the cylinders.
The rotating mechanism further includes pinions which are mounted on the shafts of the gears and are operatively connected therewith through clutches, these pinions meshing with the toothed racks of the hydraulic cylinders. With the hydraulic cylinder performing its working stroke, the toothed racks rotate the pinions which drive the gears through the intermittently engageable clutches. The gears, the intermittently engageable clutches and the pinions are mounted successively along the axes of the respective shafts.
The displacement of the mining machine, e.g. a mining cutter-loader along the working-face is effected by making one pair of the gears roll along the guiding rack, while the other pair of the gears stays in a preparatory cycle during which the hydraulic cylinders associated therewith are actuated through the return stroke.
With this design of the rotating mechanism incorporating the abovementioned intermittently engageable clutch, the entire chainless displacement system is bound to have relatively large dimensions, particularly, if it is intended to transmit efforts in the 20-30 ton range.
Furthermore, with the successive arrangement of the gears, intermittently engageable clutches and pinions, the dimensions of this chainless displacement system of the prior art in the direction of their arrangement are likewise relatively great. This fact virtually precludes the incorporation of this chainless displacement system of the prior art in a mining cutter-loader intended for operation in thin seams.
SUMMARY OF THE INVENTION
The present invention is to provide a chainless feed system of a mining cutter-loader wherein the rotating mechanism of each gear should be of a structure providing for reducing the dimensions of the chainless feed system.
This aim is attained in a chainless feed system of a mining cutter-loader comprising a guiding rack mounted on the conveyer, meshing with at least one pair of gears rotatably mounted on the cutter-loader and operatively connected through a rotating mechanism with hydraulic cylinders operable for rolling the gears along the guiding rack, in which feed system, in accordance with the invention, the rotating mechanism of each gear includes a carrier rotatably mounted on the shaft of the gear and having a pawl adapted to engage the gear during the working stroke of the rotating mechanism and disengage itself from the gear during the return stroke, for which purpose the pawl is pivotally mounted on the carrier, which is operatively connected with the hydraulic cylinders arranged in opposition relative to the pawl.
With this structure of the rotating mechanism of each gear, the chainless feed system of a mining cutter-loader is of relatively small dimensions, which is of essential significance for the use of the system in mining cutter-loaders intended for operation in thin seams, even in cases where relatively great efforts are to be transmitted.
It is expedient that each pawl be mounted in the same plane with the respective gear.
With this arrangement of the pivotable pawl, the overall dimensions of the ch
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Golubeva Svetlana M.
Khorin Vladimir N.
Masovich Felix Z.
Shishlov Vyacheslav I.
Gosadarstvenny Proektno-Konstruktorsky I Experimentalry Institut
Staab Lawrence
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