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Gold/Mining/Energy : A Penny Gold software program.Pls Help Me!
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To: Bill Jackson who wrote (34)1/1/1998 12:50:00 PM
From: E. Charters  Read Replies (1) of 83
 
The recover horsepower from the cage by balancing it with another
skip or cage or weight on a continuous rope. They are built for safety rather than efficiency. The brakes are wood strips that will not overheat rather than mineral. Everything is kept simple. It is hard to make a monel spring, so that is mild steel. Water drips continually in shafts keeping the wood from rotting on the bearer timbers but threatening all else. I have never seen cathodic protection of cage or shaft piping. Underground pipe seems to last. I have removed some that was 50 years old and still good. Electric brakes are perhaps too complex for cage systems. BUT the elevator systems developed by Otis at the turn of the century are much more reliable. In many rope breaks in the States there has never been a fatality. They always work and they are quite involved. Less goes wrong with the more complex machinery. but these systems are inspected by company personnesl continually, travels a lot slower and are not open to the elements. Also it is hard to align guides over such a structure as a mine with the precision necessary to make such a brake work. The clearance on guide timbers varies by inches and there is constant buffeting as the cage travels. A riding wheel would have to be some sturdy to put up with the 2700 feet per minute and +120 miles a day travel in an ordinary high capacity mine. I have thought that a toothed wheel on a spring with a spring brake (internal) like a car might be better. A wheel cannot ride through like a dog. Application of the brake has to be better than free fall and is less likely to split a guide.

Cage tests every three months at underground mines across Canada routinely stop cages to prove the dog system does work. The Additional hammering of the rope still has not been dealt with. Or the breakage of a guide.

echarter@vianet.on.ca

The Canadian Mining Newsletter
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