METHOD TO CONTROL HYDROHAMMER Russian patent published in 2014 - IPC E02D7/10 

FIELD: construction.

SUBSTANCE: method to control a pile-driving hydrohammer consists in switching of two two-position valves, one of which periodically communicates a piston cavity of a hydraulic cylinder with a drain manifold, the other periodically communicates a cylinder bottom with the cylinder head. Each valve is controlled from a separate electrohydraulic distributor, signals for switching of which are generated by a controller during interaction of a mobile element of a hammer with a position sensor. Opening of any valve starts at full or partial closure of the other valve, besides, the specified sequence of the valves switching is provided by time delays of actuation of electrohydraulic distributors set by the controller from the moment of interaction of the mobile element of the hammer with the position sensor.

EFFECT: invention provides for a stable cycle of operation of a hydraulic pile-driving hammer.

1 dwg