Abstract:
A linerbolt removal tool, including: a housing; a moil supported for reciprocating movement by the housing; an inertial body located within the housing; a gas charged accumulator extending from the inertial body away from the moil; a piston moveable within the inertial body between a striking position at which the piston strikes the moil and a retracted position, whereby firing the piston from its retracted position to its striking position includes causing pressurised gas within the accumulator to accelerate the piston toward the moil, wherein the piston has a striking end for striking the moil and an opposing rear end; and a piston cap that encloses the rear end of the piston, wherein during firing, the piston and the piston cap initially accelerate together and prior to the piston reaching its striking position the piston cap separates from the piston, whereby the piston cap isolates the piston from the accumulator.
Abstract:
A pressure accumulator, rock breaking machine and method of storing pressure energy. The accumulator (8) comprises a casing (10) and an elastic membrane (16) arranged inside the casing. The membrane divides an inner space of the casing into two separate pressure spaces. A gas space (17) is prefilled with pressurized gas. On the opposite side of the membrane is a hydraulic space (18) for receiving hydraulic fluid. The membrane is a hat-like element comprising side walls, a mounting flange (21) at its open end (54) and a closed top end (53). The mounting flange of the membrane is mounted between the casing and a flange element (13). The accumulator is without a screen. The flange element is provided with a sealing (23) for sealing a piston (9).
Abstract:
A device in a hydraulic rock drilling machine (1) including a distribution valve (7,7', 7") arranged in connection with the rock drilling machine for controlling hydraulic flows to different parts of the rock drilling machine, wherein the distribution valve includes a valve body (8, 8', 8"), which is arranged movable to and fro in axial directions inside a valve chamber (33) and wherein the valve chamber is limited in axial direction by two valve end walls (10,11; 10 ',11'; 10",11"). One of the valve end walls is movable in an axial direction against an abutment (12,12") in such a way that it defines an end position for the valve body, and a pressing device (13,13 ',13") is arranged for pressing said at least one of the valve end walls against said abutment. The invention also relates to a rock drilling machine.
Abstract:
The invention provides a control rod for a drill hammer comprising a flow passage extending from an inlet at a back head end to an outlet adjacent an opposite, inner end which is slidably locatable inside a bore of a piston and having a check valve located at the outlet. The check valve may be provided as a closure having an enlarged head in sliding sealed engagement with the flow passage. The head has a stem extending to an inner end of the control rod. A compression spring is located around the stem. On the opposite side of the enlarged head is a working face upon which pressurised air acts to compress the spring and thus open the check valve. The free end of the stem may either abut against a plug in the rod inner end or pass through an opening in the end wall and abut on the opposite side of the end wall with a stop formed on the free end of the stem. The check valve opens when the spring is compressed. In this condition the enlarged head exposes radial ports in the control rod side walls for the passage of air.
Abstract:
A pulse drilling machine (1;1' ) for the generation of shock wave pulses in a tool direction (R) including a housing (2) wherein an impulse piston (4; 4') is arranged, and including means (9) for abrupt change of a fluid pressure influencing the impulse piston in order to achieve a force resultant on the impulse piston in the tool direction and thereby generate a shock wave pulse in a drill string (13; 13') which is connected to the machine, wherein inside the housing there is arranged a first fluid chamber (14;3' ) inside which a pressure fluid in operation is arranged to exert a pressure in the tool direction on the impulse piston. The machine is distinguished by a fluid flow channel (11; 18; 19), which includes means for damping a fluid flow flowing from said first fluid chamber through the fluid flow channel obtained when influencing the impulse piston (4; 4') in a direction opposite to the tool direction (R) by rock reflexes in the drill string during drilling.
Abstract:
L'appareil comportant un corps (2) à l'intérieur duquel sont ménagés un alésage servant au montage coulissant d'un outil (3) et un alésage étage formant un cylindre pour un piston étage (1 ) qui délimite avec celui-ci une chambre haute (5) et une chambre basse (4) alimentées de façon séquentielle par du fluide incompressible sous haute pression, sous l'action d'un distributeur (6), un dispositif de pilotage permettant de faire varier la course du piston de frappe entre une course longue et une course courte et inversement. Le dispositif de pilotage comprend un cylindre, dans lequel débouche au moins un canal (14) débouchant également dans le cylindre du piston de frappe (1 ) et un canal (13) relié au distributeur, et dans lequel est monté un tiroir (12) dont une première face est située dans une première chambre (17) soumise en permanence à une pression déterminée et dont la seconde face est située dans une seconde chambre (21 ) reliée à une chambre de freinage (10).
Abstract:
The invention concerns an impacting device capable of being advantageously used in an impact hammer and/or a drill for releasing by impact tools blocked in rocks. For this purpose, an impact impetus supplied by an impact piston (1) is modified by means of a impact-deflecting device comprising a sliding lever (8) and a deflecting lever (12), such that said impact is carried out in a releasing impact direction (F) opposite the normal impact direction (B) and is transmitted to a tool (4) via a slide (15) and a locking lever (6). The tool (4) is already released after a few strokes produced by the impact piston (1). Said impact device is suitable for both unilateral air springs and double air springs.
Abstract:
Procédé de réglage de la course de frappe d'un piston de frappe d'un appareil à percussions,et un appareil à percussions pour la mise en œuvre de ce procédé L'appareil à percussions comporte un piston de frappe et un dispositif de pilotage (15) configuré pour faire varier une course de frappe du piston de frappe, le dispositif de pilotage (15) comprenant un cylindre de pilotage (17), un tiroir de pilotage (16) monté mobile en translation dans le cylindre de pilotage (17) selon une direction de déplacement (D) et monté mobile en rotation dans le cylindre de pilotage (17),et une chambre de pilotage principale (26) délimitée par le tiroir de pilotage (16) et le cylindre de pilotage (16). L'appareil à percussions comprend en outre un dispositif de réglage configuré pour régler une plage de variation de la course de frappe du piston de frappe, le dispositif de réglage comprenant un organe de réglage (41) configuré pour régler la position angulaire du tiroir de pilotage (16) dans le cylindre de pilotage (17), et au moins un passage de communication fluidique (44.1, 44.2, 44.3) ménagé sur le tiroir de pilotage (16) et configuré pour limiter hydrauliquement la course de déplacement en translation du tiroir de pilotage (16) selon la direction de déplacement (D) en fonction de la position angulaire occupée par le tiroir de pilotage (16).
Abstract:
A gas spring (38) is disclosed for use with a hammer (12). The gas spring has a body (44) with a central axis (46), and a bore (48) aligned with the central axis and extending to at least one open axial end of the body. The gas spring also has a plurality of gas chambers (50) fully enclosed by the body and isolated from each other. The bore has a flexible annular wall in communication with the plurality of gas chambers.