HYDROWEDGE DEVICE DRIVE Russian patent published in 2007 - IPC E21C37/02 

FIELD: methods or devices for dislodging by wedges, particularly downhole and blast-hole rock-cutting means to be used for breaking small and large natural rock pieces along blast-hole or well line, for mine excavation in solid rock and to disintegrate solid monolithic concrete and reinforced concrete structures or steel-casting rejects, namely cast-iron oversized items having 60-200 tons weight.

SUBSTANCE: hydrowedge device drive comprises body 3 made as fixed cylinder provided with through orifice 10 made in central part thereof. Wedge device is installed inside body 3. The wedge device includes transversal wedge 8 with through vertical orifice 9 connected with two pistons 6, 7. Lower working surface 21 of the wedge may cooperate with support 19 of hydrowedge device located in lower part of through vertical orifice 10 made in the body 3. Working surfaces of pistons 6, 7 are transversal to fixed cylinder 3 axis 11 and direction of force to be applied by pistons 6, 7 to transversal wedge coincides with wedge axis. Drive is provided with two fixed hydraulic cylinders coaxially connected with each other and with body 3. Pistons 6, 7 are located in hydraulic cylinders 1, 2 and connected with transversal wedge by means of rods 4, 5. Upper working surface 26 of the wedge is transversal to axis of through vertical orifice 10 made in body 3 and may cooperate with compensating nut 22 of hydrowedge device. The compensating nut is arranged in upper part of through vertical orifice 10. Vertical orifice 10 axis extends at 90°+α angle to axis 11 of the body 3 and hydraulic cylinders 1, 2 from the side of large wedge 8 base. Here α is angle between upper working surface 26 of transversal wedge 8 and axis 11 of the body 3 and hydraulic cylinders 1, 2. Friction surfaces of the body 3 are treated to provide antifriction properties thereof.

EFFECT: simplified device structure along with reduced mass and size thereof, improved manufacturability and increased convenience of hydrowedge device usage.

7 cl, 2 dwg