Method and apparatus for securing mining machines employed on inclined or steep seams
First Claim
1. A method for automatically braking a mining machine movable along a conveyor by means of a plurality of gearwheels which engage a rack extending along the conveyor and are driven by separate motors on the mining machine;
- which comprises measuring the rotational speeds of the motors, comparing said rotational speeds, and actuating a brake device to stop movement of the mining machine when the ratio of the speeds of the motors varies.
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Accused Products
Abstract
A method for securing mining machines, particularly longwall mining machines from sliding on inclined or steep seams in the event of a malfunction of a traction element or driving unit. The invention has particular application to longwall mining machines provided with at least two gearwheels which engage a rack extending along a working face whereby the mining machine may be advanced during a mining operation. The invention also relates to apparatus for automatically braking such a mining machine in the event of failure of a traction element.
19 Citations
9 Claims
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1. A method for automatically braking a mining machine movable along a conveyor by means of a plurality of gearwheels which engage a rack extending along the conveyor and are driven by separate motors on the mining machine;
- which comprises measuring the rotational speeds of the motors, comparing said rotational speeds, and actuating a brake device to stop movement of the mining machine when the ratio of the speeds of the motors varies.
- View Dependent Claims (2, 3, 4)
- 5. In apparatus for automatically braking a mining machine movable along a conveyor by means of a plurality of gearwheels which engage a rack extending along the conveyor, the combination of separated drive motors for each of said gearwheels, means for measuring the rotational speeds of the motors, means for comparing said rotational speeds, and apparatus for actuating a brake device to stop movement of the mining machine when the ratio of the compared speeds of the motors varies.
Specification