Abstract:
A hammer assembly (10) including a hammer housing (12) and a work tool (16) movably supported in the hammer housing is provided. A gas chamber (38) is defined in the hammer housing (12) and contains a compressible gas. An accumulator assembly (40) includes an interior space (44). A barrier (46) divides the interior space into a first interior portion (48) containing a compressible gas and a second interior portion (50) configured to receive a pressurized fluid. The barrier (46) is configured to be movable in response to changing the amount of pressurized fluid in the second interior portion (50) and such that movement of the barrier varies the volume of the first interior portion (48). The first interior portion (48) is in communication with the gas chamber (38). A control valve assembly (54) is configured for selectively placing the second interior portion (50) of the accumulator assembly (40) in communication with a pressurized fluid source.
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.
Abstract:
L'outil comprend un corps (1) pour le montage avec capacité de coulissement étanche, d'un piston (2) apte à agir sur un organe de frappe monté en bout dudit corps (1), la tête (2a) dudit piston étant montée dans un alésage (la) du corps (1) en communication avec des orifices d'échappement (le) et (Id) pour la commande d'une distribution (4) assujettie à un circuit d'alimentation (5) en air comprimé et reliée à l'un des orifices d'échappement (Id). Il présente, au-dessus de la tête (2a) du piston, une chambre (6) alimentée en air comprimé par la distribution (4) et dont le volume est déterminé pour constituer une capacité apte à filtrer les vibrations résultant d'une montée progressive de la pression lors de la phase retour dudit piston.
Abstract:
The invention relates to a pressure-fluid-operated percussion device comprising a frame (2) allowing a tool (13) to be arranged therein movably in its longitudinal direction, means for feeding pressure liquid to the percussion device (1) and for returning pressure liquid to a pressure liquid tank, and means for producing a stress pulse in the tool by utilizing pressure of the pressure liquid. The invention includes a pressure liquid source for maintaining pressure in the working pressure chamber (3), and means for intermittently feeding pressure liquid to the percussion device (1) such that the pressure liquid pushes a transmission piston into a predetermined backward position such that pressure liquid is discharged from the working pressure chamber (3), and for alternately allowing pressure liquid to be discharged rapidly from the percussion device (1) so that the pressure of the pressure liquid in the working pressure chamber (3) and pressure liquid flowing thereto from the pressure liquid source pushes the transmission piston (4) towards the tool (13), thus generating a stress pulse in the tool (13).
Abstract:
The invention relates to a pressure-fluid-operated percussion device comprising a frame (2) allowing a tool (13) to be arranged therein movably in its longitudinal direction, means for feeding pressure liquid to the percussion device (1) and for returning pressure liquid to a pressure liquid tank, and means for producing a stress pulse in the tool by utilizing pressure of the pressure liquid. The invention includes a pressure liquid source for maintaining pressure in the working pressure chamber (3), and means for intermittently feeding pressure liquid to the percussion device (1) such that the pressure liquid pushes a transmission piston into a predetermined backward position such that pressure liquid is discharged from the working pressure chamber (3), and for alternately allowing pressure liquid to be discharged rapidly from the percussion device (1) so that the pressure of the pressure liquid in the working pressure chamber (3) and pressure liquid flowing thereto from the pressure liquid source pushes the transmission piston (4) towards the tool (13), thus generating a stress pulse in the tool (13).
Abstract:
Oil-dynamic percussion machine having a body (1) in which there are a piston (3) which transforms the hydraulic power of the feeding circuit in mechanical power, a tool (5) that transfers the mechanical power to produce the demolition work, a Nitrogen-filled high pressure hydraulic accumulator (2) having the function of storing the hydraulic power supplied by the feeding circuit and characterised by a modulator slide valve (4) that keeps the operating pressure at a constant value; this mechanism controls the motion of the piston, his active displacement and the oil inlet and discharge control ports (19, 11).
Abstract:
A fluid actuated tool in the form of a hydraulic hammer (20) comprises a body (22), a cylinder (26) and a chuck body (28). A piston (34) mounted within the cylinder (26) reciprocates and impacts on a chisel (36). Movement of the piston (34) results from the supply of hydraulic fluid, controlled by an apertured distributor valve sleeve (38) with a number of cylinder ports (40) communicating with a series of axial fluid carrying bores (42). Movement of the piston (34) and the sleeve (38) bring ports (40) and bores (42) into and out of alignment, so regulating movement of the piston (34).
Abstract:
본 발명은 유압 브레이커에 관한 것으로서, 내부에 가스챔버가 마련되는 백 헤드; 상기 백 헤드의 하부에 배치되며 유압통로와 유압공간이 형성된 실린더; 상기 실린더의 하부에 배치되는 프론트 헤드; 상기 프론트 헤드의 내부에 설치되는 치즐; 상기 치즐을 타격하도록 상기 실린더에 왕복이동가능하게 설치되는 피스톤; 및 상기 백 헤드와 상기 실린더와 상기 프론트 헤드를 일체로 연결하는 복수의 관통 볼트를 갖는 브레이커 본체를 포함하며, 상기 브레이커 본체의 백 헤드에는 상기 유압통로 및 유압공간에 유압을 공급 및 차단하기 위한 콘트롤 밸브가 마련되는 것을 특징으로 한다.
Abstract:
A hydraulic impact mechanism, of the valveless impact mechanism type, comprising a pre-charged gas accumulator connected to a working chamber in order to make possible impact mechanisms for equipment for rock drilling and hydraulic breakers that is lighter, cheaper and more sustainable from the point of view of material fatigue. Furthermore, a gas accumulator of piston type with an integral brake chamber (240, 250, 360) and a piston (220, 320) designed to fit into the said brake chamber (240, 250, 360).
Abstract:
A hydraulic impact mechanism comprises a housing (10) with a cylinder bore (11) , a forward working chamber (23) and a rear working chamber (18) , a hydraulic fluid supply passage (26) continuously connected to the forward working chamber (23) and a drain passage (33) connected to the rear working chamber (18) , a hammer piston (12) reciprocally guided in the cylinder bore (11) for delivering hammer blows to a working implement (14) attached to the housing (10) , a pressure accumulator (27) pre-loaded to a certain pressure level, and a distribution valve (30) for alternatingly connecting the rear working chamber (18) to the supply passage (26) and the drain passage (33) to thereby reciprocate the hammer piston (12) , wherein a sequence valve (34) is provided in the drain passage (33) with the purpose to keep up the pressure in the rear working chamber (18) to such a level that the resulting forward directed force will prevent the piston (12) from being moved backwards in the cylinder bore (11) at pressure levels in the supply passage (26) below the pre-load pressure level of the accumulator (27).