Simplified Predicting Apparatus of Outbursts of Gas and Coal
On assessing the in-situ strength of coal by a cone-bit driver
1961 Volume 77 Issue 872 Pages 87-93
Details
1961 Volume 77 Issue 872 Pages 87-93
It is declaired by our documents already described up to date that any sorts of coal more pulverizedare generally capable to form a danger zone as to the outbursts of gas and coal, and therefore, the authors manufactured for trial a simple apparatus for assessing the in-situ strength of coal in dangerous seams.
This one, 40cm long and 1.5kg weighty, has a mechanism of spring to indicate the resistance of coal to the drive-in of a cone bit and is capable to be worked easily and rapidly by hand. The authors made experiments on the characteristics of resistance of plastic materials to the drive-in of cone bits, and on thismeasuring apparatus for accuracy and informating ability of the rate of pulverizations of coal in seams.
As a result of these studies both in laboratory and fields, this simple predicting apparatus manufactured for trial was recognized to be of use and found something to be desired in it's construction.
