Rock breaking device, protection valve and a method of operating a rock breaking device
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
E21B-007/24
F16K-021/16
출원번호
US-0285433
(2008-10-03)
등록번호
US-8118112
(2012-02-21)
우선권정보
FI-20075704 (2007-10-05)
발명자
/ 주소
Juvonen, Esko
출원인 / 주소
Sandvik Mining and Construction Oy
대리인 / 주소
Morgan, Lewis & Bockius LLP
인용정보
피인용 횟수 :
4인용 특허 :
26
초록▼
A hydraulic rock breaking device, a protection valve and a method of operating a hydraulic rock breaking device. The rock breaking device comprises a percussion device to which pressure fluid is fed along an inlet channel. The inlet channel is provided with a protection valve arranged to monitor the
A hydraulic rock breaking device, a protection valve and a method of operating a hydraulic rock breaking device. The rock breaking device comprises a percussion device to which pressure fluid is fed along an inlet channel. The inlet channel is provided with a protection valve arranged to monitor the volume flow of pressure fluid flowing through it. If the flow is larger than what has been preset, the protection valve closes, at least partly, the connection through it, protecting thus the percussion device against too high an input power. The protection valve comprises a throttle which generates a pressure difference the magnitude of which is dependent on the fed volume flow. Information on the pressure difference is utilized in controlling the protection valve.
대표청구항▼
1. A hydraulic rock breaking device comprising: a percussion device arranged to generate impact pulses in a tool connected to the rock breaking device;an inlet channel along which hydraulic fluid is feedable to the percussion device in the inlet direction of the flow;at least one protection valve ar
1. A hydraulic rock breaking device comprising: a percussion device arranged to generate impact pulses in a tool connected to the rock breaking device;an inlet channel along which hydraulic fluid is feedable to the percussion device in the inlet direction of the flow;at least one protection valve arranged in the inlet channel,the protection valve comprising: a body; at least one inlet opening for feeding hydraulic fluid to the protection valve; at least one outlet opening for feeding hydraulic fluid from the protection valve to the inlet channel; a spool arranged to move in the inlet direction of the flow and in the reverse direction of the flow; and at least one force member for moving the spool towards the inlet direction,and wherein the spool of the protection valve has three predetermined axial coupling points,the spool is arranged to become positioned at the first coupling point by the effect of the force member in a situation where the inlet opening is provided with pressure lower than a predetermined pressure, whereby the protection valve is arranged to prevent at the first coupling point the flow of the pressure fluid in the reverse direction,the spool is arranged to become positioned at the second coupling point in a situation where a flow smaller than a predetermined maximum volume flow is led through the protection valve in the inlet direction, whereby the protection valve is arranged at the second coupling point to allow a pressure fluid flow through the protection valve,and the spool is arranged to become positioned at the third coupling point in a situation where a flow larger than a predetermined maximum volume flow is led through the protection valve in the inlet direction, whereby the protection valve is arranged at the third coupling point to prevent, at least partly, pressure fluid flow through the protection valve. 2. A rock breaking device according to claim 1, wherein the protection valve is provided with at least one bypass channel through which a flow of pressure fluid smaller than a normal volume flow is arranged to be led in the inlet direction when the spool is at the third coupling point, whereby, due to the smaller volume flow, the impact frequency of the percussion device is lower than normally. 3. A rock breaking device according to claim 1, wherein the spool comprises at least one first control pressure surface which is in continuous connection with the pressure prevailing in the inlet opening and which is arranged to influence the spool in the reverse direction,the spool comprises at least one second control pressure surface which is in continuous connection with the pressure prevailing in the outlet opening and which is arranged to influence the spool in the inlet direction,the outlet opening is provided with at least one throttle to generate a pressure difference between the inlet opening and the outlet opening,the resultant force of the first control pressure surface and the second control pressure surface influencing in opposite directions is dependent on said pressure difference,and the axial position of the spool is arranged to be determined on the basis of the mutual relation of said resultant force and the force generated by the force member. 4. A rock breaking device according to claim 1, wherein the spool comprises at least one first control pressure surface which is in continuous connection with the pressure prevailing in the inlet opening and which is arranged to influence the spool in the reverse direction,the spool comprises at least one second control pressure surface which is in continuous connection with the pressure prevailing in the outlet opening and which is arranged to influence the spool in the inlet direction,the outlet opening is provided with at least one throttle to generate a pressure difference between the inlet opening and the outlet opening,the resultant force of the first control pressure surface and the second control pressure surface influencing in opposite directions is dependent on said pressure difference,and the axial position of the spool is arranged to be determined on the basis of the mutual relation of said resultant force and the force generated by the force member,the protection valve is provided with at least one relief valve which is in continuous connection with the second control pressure surface,the relief valve is arranged to open a connection to the tank of the hydraulic system when the pressure of the pressure fluid led through the protection valve exceeds a preset pressure limit,and opening of the relief valve is arranged to reduce the force generated by the second control pressure surface, whereby the spool is arranged to move, due to the effect of the force influencing the first control pressure surface, to the third coupling point, irrespective of the volume flow fed through the protection valve. 5. A rock breaking device according to claim 1, wherein the breaking device is a breaking hammer. 6. A rock breaking device according to claim 1, wherein the breaking device is a rock drilling machine. 7. A rock breaking device according to claim 1. wherein the spool of the protection valve is arranged to prevent pressure fluid flow through the protection valve at the third coupling point whereby the percussion device is stopped. 8. A rock breaking device according to claim 1, wherein the spool of the protection valve is arranged to throttle pressure fluid flow through the protection valve at the third coupling point whereby the percussion device has lower impact frequency. 9. A rock breaking device according to claim 1, wherein the spool is arranged to reach a critical position when being moved towards the third coupling point, and once the critical position has reached the outlet opening is closed inevitably and quickly. 10. A protection valve comprising: a body,at least one inlet opening for feeding hydraulic fluid to a protection valve,at least one outlet opening for feeding hydraulic fluid from the protection valve to the inlet channel of a hydraulic auxiliary device,a spool arranged to move in the inlet direction of the flow and in the reverse direction of the flow,at least one force member for moving the spool towards the inlet direction,at least one control pressure surface in the spool, the pressure of the pressure fluid influencing the control pressure surface being arranged to generate a force to move the spool axially,at least one collar in the spool, the collar being arranged to open and close a connection between the inlet opening and the outlet opening,the spool comprises at least one first control pressure surface in continuous connection with the pressure in the inlet opening and arranged to influence the spool in the reverse direction,the spool comprises at least one second control pressure surface in continuous connection with the pressure in the outlet opening and arranged to influence the spool in the inlet direction,the outlet opening is provided with at least one throttle to provide a pressure difference between the inlet opening and the outlet opening, the magnitude of the pressure difference being dependent on the magnitude of the fed volume flow,the magnitude of the resultant force of the first control pressure surface and the second control pressure surface in the reverse direction is dependent on said pressure difference,the axial position of the spool is arranged to be determined on the basis of the mutual relation of said resultant force and the force provided by a force member,the spool of the protection valve has three predetermined axial coupling points,at the first coupling point a first collar of the spool is arranged to prevent a pressure fluid flow from the inlet opening to the outlet opening,at the second coupling point there is an open connection from the inlet opening to the outlet opening when the resultant force and the force provided by the force member, influencing the spool, are in balance,and wherein at the third coupling point a second collar of the spool is arranged to prevent, at least partly, pressure fluid flow from the inlet opening to the outlet opening when the resultant force influencing the spool is greater than the force provided by the force member. 11. A protection valve according to claim 10, wherein the protection valve is provided with at least one bypass channel through which a flow of pressure fluid smaller than a normal volume flow can be led in the inlet direction when the spool is in the third coupling point. 12. A protection valve according to claim 10, wherein the protection valve is provided with at least one relief valve which is in continuous connection with the second control pressure surface,and the relief valve is arranged to open a connection to a channel leading to a tank when the pressure of the pressure fluid led through the protection valve exceeds a preset pressure limit. 13. A method of operating a hydraulic rock breaking device, the method comprising: feeding hydraulic fluid along an inlet channel in the inlet direction of the flow to a percussion device of a rock breaking device to generate and transmit impact pulses to a tool connected to the rock breaking device,controlling the operating cycle of the percussion device by means of at least one control valve,preventing, by means of at least one valve, pressure fluid from flowing back in the reverse direction when the percussion device has been stopped,leading the pressure fluid flowing to the percussion device through at least one protection valve in the inlet direction,monitoring the volume flow of the pressure fluid fed to the percussion device by means of said protection valve,and preventing, at least partly, pressure fluid flow through the protection valve if the volume flow fed to the percussion device exceeds a preset maximum volume flow determined by the protection valve. 14. A method according to claim 13, comprising preventing the flow of pressure fluid through the protection valve completely if a flow larger than the maximum volume flow is fed to the percussion device, as a result of which the percussion device stops. 15. A method according to claim 13, comprising allowing a reduced flow of pressure fluid through the protection valve if a flow larger than the maximum volume flow is fed to the percussion device, due to which the percussion device operates at a lower impact frequency than normally. 16. A method according to claim 13, comprising throttling the pressure fluid flow led through the protection valve, whereby a pressure difference is generated before a throttle and after the throttle, the pressure difference being dependent on the fed volume flow,using the information on the pressure difference in controlling the protection valve,and preventing, at least partly, the flow of pressure fluid through the protection valve if the pressure before the throttle relative to the pressure after the throttle exceeds a predetermined pressure difference. 17. A method according to claim 13, comprising preventing the pressure fluid from flowing back in the reverse direction by means of the protection valve. 18. A method according to claim 13, comprising operating the percussion device with cold pressure fluid having a first viscosity,throttling the pressure fluid flow led through the protection valve, whereby a pressure difference is generated between the inlet side and the outlet side of the throttle, the pressure difference being dependent on the fed volume flow and the viscosity of the fed pressure fluid,allowing only a partial flow of pressure fluid through the protection valve if the pressure of the inlet side of the throttle relative to the pressure of the outlet side exceeds the pressure difference predetermined for the protection valve,allowing the pressure of the pressure fluid of the hydraulic system to increase due to the effect of the restricted flow, whereby the temperature of the pressure fluid increases due to the effect of the losses generated and reaches a second viscosity, which is lower than said first viscosity,and allowing a complete flow of pressure fluid through the protection valve when the pressure of the inlet side of the throttle relative to the pressure of the outlet side reaches the pressure difference predetermined for the protection valve after the viscosity of the pressure fluid has decreased. 19. A method according to claim 13, comprising monitoring the pressure of the pressure fluid fed to the percussion device by means of a relief valve in connection with the protection valve,and preventing, at least partly, the flow of the pressure fluid through the protection valve if the pressure fed to the percussion device exceeds the preset pressure determined by the protection valve.
Kuvshinov Viktor A. (Novosibirsk RUX) Ermolaev Vladimir M. (Novosibirsk RUX) Rusin Sergei V. (Novosibirsk RUX) Goldobin Vyacheslav A. (Novosibirsk RUX), Hydraulic device for driving piles.
Arndt Friedrich K. (Essen DEX) Bartels Robert-Jan (Essen DEX) Vielhaber Heribert (Essen DEX), Method and apparatus for adapting the operational behavior of a percussion mechanism to the hardness of material that is.
Noel,Roger, Monitoring valve, rock drilling apparatus and a method for controlling at least two hydraulic actuators to such a monitoring valve and rock drilling apparatus.
Bargach, Saad; Bonner, Stephen D.; Nold, III, Raymond V.; Massey, James P.; Brunetti, Jon A., Downhole power conversion and management using a dynamically variable displacement pump.
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