For hydrodemolition of coal underground method, in addition to stationary jets are used pulse and pulsating ones.

In practice of operation of hydraulic drive systems of mining machines a great role is played by hydraulic shocks arising at switching of its switchgear and often being the cause of failure of elements of hydraulic systems ...

Compressed air power is widely used in the mining industry. It is relatively safe, and its application is associated with structurally simple, productive and durable drilling machines ...