HYDRAULIC DRILL HAMMER WITH HIGH HIT FREQUENCY, INTENDED FOR SHOCK DRILLING OF HARD ROCKS

摘要

1. A high-frequency hammer with hydraulic drive, designed for drilling hard rock, containing a housing (8, 9, 10), at one end of which is a drill head (11), designed to act directly on hard rock, and the hammer also contains a piston (20) a hammer installed with the possibility of movement in the specified housing (8, 9, 10) and acting on the drill head (11), while the piston (20) of the hammer has a longitudinally extending channel (41) with a given throughput, which is made with perhaps closing in the upward direction by means of a valve plug (23) partially following the piston (20) of the hammer during its travel, characterized in that the valve plug (23) is controllable by means of an attached valve stem (49) mounted for sliding in the sleeve (51) a valve stem, said valve stem (49) having locking means (50, 51) configured to abruptly stop the valve plug (23) at a level comprising a predetermined percentage of the total piston stroke length (20) of the hammer, and is capable of where remove the valve plug (23) from the sealing seat (40) on the piston (20) of the hammer, which ensures the opening of the specified channel (41) with the possibility of flow of channel fluid through it, and the valve stem (49) has the properties of a tension spring, which ensures the return of the plug (23) valve at high speed through mechanical rebound. 2. An impact hammer according to claim 1, characterized in that the locking means (50, 51) comprise a locking plate (50) at the upstream end of the valve stem (49) and an interacting internal locking surface in