HYDRAULIC IMPACT DEVICE Russian patent published in 2012 - IPC E21B1/26 B25D9/26 

FIELD: construction.

SUBSTANCE: device comprises a body, a work tool, a cylinder and a piston - a striker, forming a braking chamber and chambers of working and return strokes, a hydraulic pneumatic accumulator of pressure in a discharge line, a distributor arranged in the form of a case and a rotary slide with a turbine in a turbine chamber, connecting the working stroke chamber by means of windows and channels in turns with the discharge and drain lines, and the back stroke chamber - permanently with the discharge line, and also a flow controller setting working fluid supply to the slide turbine according to the striker condition. The device is equipped with a controller of the piston-striker stroke value, which comprises a piston - a plunger, located in a hydraulic cylinder, having piston, stem and plunger cavities, besides, the piston cavity is connected via a check valve and a throttle with the braking chamber of the device, the stem cavity - with the discharge line, and the plunger cavity - with the rotary distributor and the working stroke chamber of the device by means of holes in the body of its cylinder arranged one behind the other in direction of its axis.

EFFECT: higher efficiency of a hydraulic impact device by realisation of automatic control of single strike energy depending on a work tool load.

1 dwg