SYSTEM OF HYDRAULIC BREAKER WITH STEPLESS AUTOREGULATION OF STROKE Russian patent published in 2017 - IPC B25D9/26 B25D9/12 B02C19/00 

FIELD: mining.

SUBSTANCE: transmitter (100) is provided with a sensor (110) to detect vibrations generated by the bit. MCU (240) of the receiver (200) controls the crusher. The piston (302) is located in the crusher cylinder (301). The first (302a) and the second (302b) piston surface is directed so that the imposed pressure acts in the back stroke and the forward stroke respectively. An annular recess (303) is located between the piston surfaces. The control plunger (309a) is located in the control valve (309) with a small (309b) surface to shift the plunger in the back stroke position and a large (309s) surface to shift the plunger in the forward stroke position. The front side of the travel valve (319) is connected to a hydraulic pump (311) through the pressure pipeline with the pressure pipeline (321) of stroke control. The output side of the travel valve is connected to a switching pipeline (313) of the control valve via an additional pipeline (322). The lower side of the valve is connected to the pump through a the valve (320) of flow control. MCU controls the flow valve. The spring on the upper surface of the travel valve ensures reset when the pressure changes. According to the first version the pressure pipeline (312) of working pressure is connected to the cylinder through the first output. The return pipeline (317) of low-pressure is connected with the cylinder through the second output. According to the second version the pressure pipeline (312) of working pressure is connected to the front chamber (307) of the cylinder through the first output. The pipeline (318) of variable pressure connects the control valve (309) and back chamber (306) of the cylinder through the second output. The switching pipeline (313) connects the plunger large surface and the third output (313a) of the cylinder. The third output is located between the first and second outputs of the cylinder. The return pipeline (317) of low-pressure is connected to the cylinder through the forth output. The piston long stroke operation is provided with the working pressure on the plunger large surface through the third output (313a) of the switching pipeline (313) when the valve (320) of flow control is closed, and the travel valve (319) disconnects the pressure pipeline (321) of stroke control and additional pipelines. The piston short stroke operation is provided with the working pressure on the plunger large surface through the travel valve (319) when the valve (320) of flow control is open, and the valve (319) connects the pressure pipeline (321) of stroke control and the additional pipeline.

EFFECT: reduction of energy impact in the event of idle stroke.

5 cl, 7 dwg