Assuring the Required Tip to Face Distance
For the longwall system at the Yalevskogo mine, SUEK combined Cat roof supports from other longwall faces. In total three different types of Cat roof supports were combined – with closed an extended heights ranging from 2200/4800 mm, 2400/5000 mm, and 2550/5500 mm.
The challenge for Caterpillar was to match the armored face conveyor to these different roof support types. This was necessary because of the tip to face distance – the distance between the canopy tip and the coal face.
The tip to face distance is a very critical measurement in order to maximize roof integrity and limit dilation. It should be less than approximately 0.6m. The smaller the distance the better the result. For Russian mines the national law stipulates a tip to face distance of 412 mm.
For the different roof support types, Caterpillar manufactured custom-specific clevis mountings – the connection between AFC line pan and roof support base - in order to assure that all face roof supports have the same tip to face distance, according to the national regulations.
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