Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
  • B25D—PERCUSSIVE TOOLS
  • B25D9/00—Portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
  • B25D9/14—Control devices for the reciprocating piston
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
  • B25D—PERCUSSIVE TOOLS
  • B25D9/00—Portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
  • B25D9/14—Control devices for the reciprocating piston
  • B25D9/16—Valve arrangements therefor
  • B25D9/20—Valve arrangements therefor involving a tubular-type slide valve
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
  • B25D—PERCUSSIVE TOOLS
  • B25D9/00—Portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
  • B25D9/06—Means for driving the impulse member
  • B25D9/12—Means for driving the impulse member comprising a built-in liquid motor, i.e. the tool being driven by hydraulic pressure
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
  • B25D—PERCUSSIVE TOOLS
  • B25D9/00—Portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
  • B25D9/14—Control devices for the reciprocating piston
  • B25D9/16—Valve arrangements therefor
  • B25D9/18—Valve arrangements therefor involving a piston-type slide valve
• • E—FIXED CONSTRUCTIONS
  • E21—EARTH OR ROCK DRILLING; MINING
  • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
  • E21B1/00—Percussion drilling
  • E21B1/12—Percussion drilling with a reciprocating impulse member
  • E21B1/24—Percussion drilling with a reciprocating impulse member the impulse member being a piston driven directly by fluid pressure
  • E21B1/26—Percussion drilling with a reciprocating impulse member the impulse member being a piston driven directly by fluid pressure by liquid pressure
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
  • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
  • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
  • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
  • F16K27/00—Construction of housing; Use of materials therefor
  • F16K27/04—Construction of housing; Use of materials therefor of sliding valves
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
  • F16K27/00—Construction of housing; Use of materials therefor
  • F16K27/04—Construction of housing; Use of materials therefor of sliding valves
  • F16K27/041—Construction of housing; Use of materials therefor of sliding valves cylindrical slide valves

Definitions

• the invention relates to a device in respect of a hydraulic rock drilling machine including a distribution valve 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, which is arranged movable to and fro in axial directions inside a valve chamber and wherein the valve chamber is limited in axial direction by two valve end walls.
• the invention also relates to a hydraulic rock drilling machine including such a device .
• valve including a valve with a removable valve end wall.
• a device when at least one of the valve end walls is movable in an axial direction against an abutment in such a way that it defines a fixed end position for the valve body, that a pressing device is arranged for pressing said at least one of the valve end walls in a direction of the second one of said valve end walls and against said abutment, and that said pressing device includes an end wall piston portion arranged on said at least one of the valve end walls and being received in a cylinder portion to be pressurized in order to drive the valve end wall against said abutment during pressurizing.
• valve will become more simple and more economic to produce and to integrate into a rock drilling machine.
• machining operation for producing a defined axial position of a bottom of a bottom hole accurately and with high tolerances can be dispensed with.
• the respective valve end wall is influenced by a pressing device to be normally pressed against said abutment axially in a direction towards the second valve end wall of the distribution valve in order to achieve a fixed end
• a defined abutment can be provided which can be made with high precision and to a considerable lower cost than what is the case for creating a defined position of a bottom hole.
• the abutment can be formed in the valve housing or on a specially provided sleeve or the like being arranged between the two valve end walls.
• Said cylinder portion is preferably provided with a connection to a hydraulic pressure source.
• the hydraulic pressure source is preferably a rock drilling machine system pressure source which economically advantageously results in that a pressure source already existing in the machine can be used.
• Such a system pressure source can be the source e.g. for any one of percussion pressure, rotation pressure and damping pressure .
• valve chamber in a radial direction is limited by a valve bushing, which is formed with said abutment. This way the position of said abutment (-s) and thereby the end positions of the valve body can be determined and be provided economically with high position.
• valve bushing can be produced so as to comprise one unit which includes on the one hand the control edges of the valve chamber co-operating with the valve body, on the one hand said abutment ( -s) , which in co-operation with the respective valve end wall defines the end position (or end positions) of the valve body, through the invention is ensured in an economic, efficient and secure manner that the elements of the valve chamber determining the control function are accurately positioned relative to each other.
• valve bushing on a side opposite to the one (or first) of the valve end walls abuts the second one of the valve end walls, which in this embodiment is a fixed valve end wall .
• valve bushing is axially displaceable inside a space receiving the valve, and wherein, according to the above, said first valve end wall is pressed against the valve bushing, it is safely achieved that the two end positions of the valve body are accurately positioned in respect of the control edges of the valve bushing .
• the valve bushing lies against a housing wall whereon abuts also one of the valve end walls, which is also in this case fixed.
• a first as well as a second valve end wall can be movable axially against the respective
• an end position regulating device is arranged at at least one of the valve end walls for positioning thereof axially in respect of said abutment for adjusting the end position (end positions) of the valve body.
• the end position regulating device includes a chamber, which is able to be pressurized with varying pressure acting against any one from the group: a mechanical spring device, a
• the invention also relates to a hydraulic rock drilling machine with a machine housing which receives a working cylinder with a to and fro movable impact piston including a device according to the above .
• said device with said distribution valve is received in the machine housing. This gives good possibility of integrating components and thereby cost savings.
• the distribution valve has an axis which is parallel to an axis of the working cylinder. This gives the possibility of producing a slim and space-saving rock drilling machine.
• the rock drilling machine has a machine end wall of the working cylinder, wherein said machine end wall also closes a space for receiving the distribution valve.
• said machine end wall also closes a space for receiving the distribution valve.
• Fig. 1 shows a rock drilling machine including a device according to the invention in an axial section
• Fig. 2 shows an enlarged section of a rear end portion of the rock drilling machine in Fig. 1, and
• Figs. 3 and 4 show, diagrammatically, two other variants of distribution valves.
• FIG. 1 is thus shown an axial section of a rock drilling machine 1 including a machine housing 2, wherein an impact piston is axially movable to and fro inside a cylinder space comprising a working cylinder 4.
• the impact piston 3 performs impacts in an impact direction R against a shank adapter 5 in a per se known manner.
• a rear housing end wall 6 which closes the cylinder space 4.
• a distribution valve 7 for distributing pressure fluid to the drive chambers of the rock drilling machine for driving the impact piston 3 to and fro.
• the distribution valve 7 comprises a to and fro movable valve body 8 which is movable inside a valve bushing 9 between two end positions defined by abutments against a first valve end wall 10 and a second valve end wall 11, respectively.
• the valve bushing 9 limits a valve chamber 33 receiving the valve body 8 and exhibiting usual bores comprising openings of channels being connected to the distribution valve 7.
• the valve bushing is arranged to accurately define control edges for co-operation with
• the distribution valve 7 is arranged in a valve space 20 inside the housing 2 being closed by said rear housing end wall 6.
• the first valve end wall 10 is influenced by pressure in a chamber 13, being permanently pressurized in operation of the rock drilling machine 1, said chamber 13 co-operating with a piston portion 25 on the first valve end wall 10. Because of this pressurization, the first valve end wall 10 is pressed in a direction towards the second valve end wall 11.
• valve end wall 10 exhibits an abutment surface 2S being directed against the second valve end wall 11, whereby said abutment surface 26 will come into abutment against an abutment 12 at the end of the valve bushing 9.
• the valve end wall 10 will be accurately positioned relative to the valve end wall 11 during pressurization of the chamber 13.
• valve bushing 9 can be machined in respect of control edges as well as at its (abutment) end(-s) in a relatively simple way.
• valve body 8 has a first abutment end 21 at a distance from a first end abutment 17 on the first valve end wall 10 of the valve.
• the valve body 8 is in this position in abutment with a second abutment end 22 against a second end abutment 34 on the second valve end wall 11.
• An intermittently pressurized channel 14 is in this shown position pressurized such that a hydraulic pressure actuates an end surface 15 of a central end piston portion 23 of the valve body 8, resulting in that this element takes the
• valve body 8 When the channel 14, because of the movement of the impact piston 3, instead is relieved from pressure (not shown) , the valve body 8 will be driven to the left in the Figure, such that the first abutment end 21 of the valve body 8 will come to abutment against the first end abutment 17 on the first valve end wall 10.
• the invention can also be realized by both the first and the second valve end wall 10, 11 being movable such that both valve end walls can be pressed against abutments in directions towards each other for defining two defined end positions for the valve body 8.
• the distribution valve 7 can also be made without a specific valve bushing 9.
• an abutment corresponding to the abutment 12 can be arranged otherwise in the valve space 20, for example by an inserted locking sleeve comprising an abutment (corresponding to 12) of the valve end wall 10.
• a bore having an abutment can be machined from the end opposite to the opening of the bore shown in Fig. 2 or in any other per se known way.
• FIG. 2 the distribution valve 7 is shown with its valve axis 18 parallel to the axis of the impact piston 3 and the work cylinder 4, being the axis of the percussion device of the rock drilling machine 1.
• This embodiment has the advantage that the rock drilling machine can be made slim and space-saving in its rear region. It also allows that said rear housing end wall 6 is common to the working cylinder and the distribution valve such that an otherwise necessary partition plane can be dispensed with. Through the construction with common axes and common rear housing end wall is achieved the advantage of lower machining costs and thereby reduced costs for the rock drilling machine. Further, the risk of moist and debris penetrating into the machine is reduced as well as the risk of failure because of unintentionally released screws.
• a further advantage with having a pressurized valve end wall is that the valve body contacting this end wall will experience a softer abutment, since the pressurized valve end wall will be somewhat resilient and somewhat gives away in connection with the impact of the valve body. This reduces strain on the valve and thereby enhances function and increases working live. It is possible, within the scope of the invention, to make it possible to regulate this resilience by for example dimensioning a confined volume and a throttle in the conduit supplying hydraulic medium.
• Fig. 3 shows a variant with a distribution valve, wherein a chamber 13' is pressurized with a variable pressure through a variable pressure source 30 against the action of a spring 28.
• the valve end wall will thus be adjusted such that the higher the pressure the longer the valve end wall 10' will be set in the direction towards the second valve end wall 11' .
• This gives in certain particular operational cases a possibility to regulate the end position of the valve body and thereby the operation of the rock drilling machine.
• “abutment” shall be interpreted such that the pressure is so high that the spring reaches the bottom, wherein a "fixed” abutment is obtained. For lower pressures, said adjustability is thus obtained.
• the channels of the distribution valve are not shown in Fig. 3 for the sake of clarity. Channels for pressurized hydraulic fluid are indicated with interrupted lines.
• Fig. 4 shows a variant of a distribution valve similar to the one in Figs. 1 and 2, but in this case (as in Fig. 3) it is intended to illustrate a distribution valve without a valve bushing.
• "Valve space” is in this case "valve chamber”.
• a chamber 13" is pressurized with a constant pressure.
• 12" indicates an abutment in the housing, which can be a machine housing of the rock drilling machine or a valve housing.
• the abutment 12" is suitably produced through boring from the left, which is a direction opposite to the opening of the bore of the space for the distribution valve as seen in all
• a lid for the further bore is indicated with 29.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Fluid Mechanics (AREA)
• Physics & Mathematics (AREA)
• General Engineering & Computer Science (AREA)
• Geology (AREA)
• Mining & Mineral Resources (AREA)
• Life Sciences & Earth Sciences (AREA)
• Environmental & Geological Engineering (AREA)
• General Life Sciences & Earth Sciences (AREA)
• Geochemistry & Mineralogy (AREA)
• Earth Drilling (AREA)
• Drilling And Exploitation, And Mining Machines And Methods (AREA)
• Percussive Tools And Related Accessories (AREA)

Priority Applications (7)

Applications Claiming Priority (2)

Publications (1)

Family

ID=50828270

Family Applications (1)

Country Status (9)

Cited By (1)

Families Citing this family (1)

Citations (4)

Family Cites Families (17)

• 2012
  • 2012-11-28 SE SE1251342A patent/SE536903C2/sv unknown
• 2013
  • 2013-11-22 AU AU2013352659A patent/AU2013352659B2/en active Active
  • 2013-11-22 CA CA2888570A patent/CA2888570C/en active Active
  • 2013-11-22 JP JP2015544035A patent/JP6304834B2/ja active Active
  • 2013-11-22 US US14/435,209 patent/US9937611B2/en active Active
  • 2013-11-22 CN CN201380061945.8A patent/CN104822496B/zh active Active
  • 2013-11-22 EP EP13859488.2A patent/EP2925491B1/en active Active
  • 2013-11-22 WO PCT/SE2013/051376 patent/WO2014084776A1/en not_active Ceased
• 2015
  • 2015-06-25 ZA ZA2015/04599A patent/ZA201504599B/en unknown

Patent Citations (4)

Non-Patent Citations (1)

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