Classifications

• • E—FIXED CONSTRUCTIONS
  • E21—EARTH OR ROCK DRILLING; MINING
  • E21C—MINING OR QUARRYING
  • E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
  • E21C35/18—Mining picks; Holders therefor
  • E21C35/188—Mining picks; Holders therefor characterised by adaptations to use an extraction tool

Definitions

• the present disclosure relates to a shank pick releasing tool and rotatable shank pick.
• the present disclosure further relates to a method for releasing a rotatable shank pick.
• Working machines such as drum cutters, comprises tools carrying rotatable shank picks configured to work into soil, asphalt, concrete or similar in the field of cutting production of minerals in mining applications and comparable applications in construction, demolition, road construction and earth works.
• the working machine may be connected to an industrial machine, such as a mining machine, an excavator or a wheeled loader.
• an industrial machine such as a mining machine, an excavator or a wheeled loader.
• the rotatable shank picks rotates in order to wear symmetrically and thus be self-sharpened.
• the rotatable shank picks are retained in apertures in the working machine, which allow the rotatable shank picks to rotate when the working machine is in operation.
• the rotatable shank picks may be retained in the apertures by a locking element.
• a head portion of each rotatable shank pick is in contact with the soil, asphalt, concrete or similar and works the soil, asphalt, concrete or similar during rotation.
• the head portion of the rotatable shank pick may comprise tungsten carbide.
• the total weight of the working machine and the construction machine may be in the range of 90 - 7000 kilograms.
• the weight of the shank pick may be 0,08 - 2,2 kilograms. Due to the weight of the working machine and the construction machine in relation to the weight of the shank pick, the exerted forces on the shank picks during operation are often very large.
• the rotation of the rotatable shank pick will increase the life of the rotatable shank pick.
• the rotatable shank pick may be stuck in the aperture of the working machine, which prevents the rotatable shank pick to rotate and obstructs replacement of the shank pick.
• the wear of a stuck rotatable shank pick may be asymmetrically, which may shorten the life of the rotatable shank pick.
• a stuck rotatable shank pick may however be released or replaced by service personnel in order to return the working machine to operation.
• Document WO 2016/164919 Al discloses a cutting bit of an industrial machine.
• the cutting bit may be axially removed from a bit holder by means of an extraction tool.
• the extraction tool includes a wedge shaped head with a pair of fingers configured to be disposed on either side of the cutting bit. Applying an impact force on the head of the extraction tool will urge the bit to move out of the bit holder and separate the bit from the bit holder.
• Another known method to remove shank picks from the aperture of a working machine is to weld a gripping element to the pick and release the pick by exerting torque and axial forces on the gripping element in order to release the shank pick from the working machine.
• the resulting force in the axial direction of the shank pick using the extraction tool may harm the shank pick, the shank pick holder and the working machine.
• using the known method of welding a gripping element to the shank pick is time consuming, will need at least two service persons on site and will harm the shank pick.
• the forces needed to release the shank picks in the axial direction and the welding operation on site may be challenging for the personnel on site.
• An object of the invention is thus to provide an improved shank pick releasing tool, a rotatable shank pick and a method, for decreasing the downtime of a working machine due to stuck rotatable shank picks, for decreasing required service time for releasing stuck rotatable shank picks, for increasing durability of the rotatable shank picks, and for increasing the working safety during releasing or replacing the rotatable shank picks.
• a shank pick releasing tool for releasing a rotatable shank pick, which is configured to be axially fixated in a working machine, the releasing tool comprising: an adapter device with a first grip portion; and a wrench device, wherein the first grip portion is configured to be connected to a drive profile of the rotatable shank pick, wherein the first grip portion of the adapter device comprises first protrusions, which are configured to engage in first recesses in the drive profile of the rotatable shank pick, and wherein the adapter device is configured to be coupled to the wrench device.
• the shank pick releasing tool is configured to apply torque to the rotatable shank pick.
• the torque emanates from a force exerted on the shank pick releasing tool.
• the shank pick releasing tool comprises the wrench device.
• the rotatable shank pick is configured to be rotatable released by the shank pick releasing tool.
• the working machine may be a drum cutter, which is configured to work into soil, asphalt, concrete or similar.
• the working machine may be any other type of working machine, which is configured to work into soil, asphalt, concrete or similar.
• Such working machines may be surface miners, road headers, trench cutting machines, continuous miners or coal mining machines.
• a rotatable shank pick for a working machine comprises a head portion, a shank portion connected to the head portion, and a drive profile, wherein the drive profile is configured to be connected to a first grip portion of a shank pick releasing tool disclosed herein.
• the shank portion of the rotatable shank pick is configured to be rotatably arranged in an aperture of the working machine.
• the rotatable shank pick is configured to be axially fixated in the working machine. The axial fixation of the rotatable shank pick prevents the rotatable shank pick to be inadvertently removed from or fallen out of the aperture.
• the aperture may be a through hole.
• the shank portion may have a larger extension than the through hole.
• the axial fixation of the rotatable shank pick in the through hole may be achieved by a locking element, such as locking washer, a locking pin or a similar locking element.
• the aperture may be a bottomed bore, wherein the shank portion of the rotatable shank pick is axially fixated by a spring or expander member.
• the first grip portion has a shape that is adapted to fit with the shape of the drive profile of the rotatable shank pick.
• a method for releasing a rotatable shank pick of a working machine comprising head portion, a shank portion connected to the head portion, and a drive profile, wherein the drive profile is configured to be connected to a first grip portion of a shank pick releasing tool, the shank pick releasing tool comprising an adapter device with a first grip portion; and a wrench device, wherein the first grip portion is configured to be connected to the drive profile of the rotatable shank pick, wherein the first grip portion of the adapter device comprises first protrusions, which are configured to engage in first recesses in the drive profile of the rotatable shank pick, wherein the adapter device is configured to be coupled to the wrench device, and wherein the method comprises the steps of: connecting the first grip portion of the shank pick releasing tool to the drive profile of the rotatable shank pick; applying a torque to the rotatable shank pick by the shank pick releasing tool;
• the connection of the first grip portion to the drive profile is possible due to the fact that the first grip portion and the drive profile have shapes that allows the shank pick releasing tool to move axially in relation to the drive profile.
• torque may be transferred from the shank pick releasing tool to the drive profile.
• the torque applied by the shank pick releasing tool will be transferred to the drive profile of the rotatable shank pick and thus to the entire rotatable shank pick.
• the torque should be large enough to release a stuck rotatable shank pick in the working machine. After the stuck rotatable shank pick has been released and is free to rotate, the axial force needed to remove the shank pick from the working machine is low and gentle to the working machine, improving safety for service personnel.
• Fig. 1 illustrates a view in perspective of a shank pick releasing tool and rotatable shank pick according to an example
• Fig. 2 illustrates a view in perspective of a shank pick releasing tool and rotatable shank pick according to an example
• Fig. 3 illustrates a view in perspective of a shank pick releasing tool and rotatable shank pick according to an example
• Figures 4a and 4b illustrate a view from above and a side view of a rotatable shank pick according to an example
• Fig. 5 illustrates side views of a working machine with rotatable shank picks according to an example
• Fig. 6 shows a flowchart of a method according to an example.
• Fig. 7 shows a flowchart of a method according to an example.
• a shank pick releasing tool for releasing a rotatable shank pick, which is configured to be axially fixated in a working machine, the releasing tool comprising: an adapter device with a first grip portion; and a wrench device, wherein the first grip portion is configured to be connected to a drive profile of the rotatable shank pick, wherein the first grip portion of the adapter device comprises first protrusions, which are configured to engage in first recesses in the drive profile of the rotatable shank pick, and wherein the adapter device is configured to be coupled to the wrench device.
• the shank pick releasing tool is configured to apply torque to the rotatable shank pick.
• the torque may be converted from a force exerted on the shank pick releasing tool.
• the shank pick releasing tool comprises the wrench device.
• the wrench device may comprise a lever. A force may be exerted on the lever.
• the wrench device may be connected to a machine, which creates the torque of the wrench device.
• the wrench device may be a machine part of such a machine.
• the rotatable shank pick is configured to be rotatably arranged in an aperture of the working machine.
• the aperture may be a through hole.
• the rotatable shank pick has a larger extension than the through hole.
• the rotatable shank pick is configured to be axially fixated in the working machine.
• the rotatable shank pick may be stuck in the aperture, which prevents the rotatable shank pick to rotate in the aperture.
• the rotatable shank pick may be rotatable released by the shank pick releasing tool.
• the axial fixation of the rotatable shank pick allows the rotatable shank pick to rotate.
• the axial fixation of the rotatable shank pick prevents the rotatable shank pick to be inadvertently removed or fallen out of the aperture.
• the working machine may be a drum cutter, which is configured to work into soil, asphalt, concrete or similar.
• the working machine may be any other type of working machine, which is configured to work into soil, asphalt, concrete or similar.
• the adapter device has a shape that is adapted to fit with both the shank pick releasing tool and the rotatable shank pick.
• the first grip portion has a shape that is adapted to fit with the shape of the drive profile of the rotatable shank pick.
• the first grip portion may have a shape that is complementary to the shape of the drive profile of the rotatable shank pick.
• the drive profile of the rotatable shank pick has first recesses.
• the first protrusions of the first grip portion are configured to protrude into the first recesses of the rotatable shank pick. The first protrusions engage in the first recesses when the first protrusions protrude into the first recesses.
• the first grip portion and the rotatable shank pick may have shapes that allows the adapter device to move axially in relation to the rotatable shank pick.
• the first grip portion and the rotatable shank pick have shapes that prevent the adapter device to rotate in relation to the rotatable shank pick.
• the adapter device and the wrench device are coupled to each other, so that the adapter device is prevented to rotate in relation to the wrench device.
• the adapter device and the wrench device have shapes that prevent the adapter device to rotate in relation to the wrench device. When rotating the wrench device, also the adapter device will rotate.
• the coupling between the wrench device and the adapter device is configured to transfer torque from the wrench device to the adapter device.
• the torque from the wrench device is configured to be transferred to the rotatable shank pick via the adapter device.
• the adapter device and the wrench device are coupled to each other, so that the adapter device is prevented to rotate in relation to the wrench device.
• the first grip portion is configured to transfer torque from the adapter device to the rotatable shank pick.
• the torque from the wrench device is configured to be transferred to the rotatable shank pick via the adapter device and the first grip portion of the adapter device.
• the first grip portion of the adapter device is configured to circumferentially surround the drive profile of the rotatable shank pick.
• the contact area between the adapter device and the rotatable shank pick increases when the adapter device is configured to circumferentially surround the drive profile. Therefore, a large torque may be transferred from the adapter device to the rotatable shank pick when the adapter device is configured to circumferentially surround the drive profile.
• the adapter device comprises a second grip portion, which is configured to be at least partly circumferentially surrounded by the wrench device for coupling the adapter device to the wrench device.
• the contact area between the second grip portion of the adapter device and the wrench device increases when the wrench device is configured to circumferentially surround the second grip portion of the adapter device. Therefore, a large torque may be transferred from the wrench device to the adapter device when the wrench device is configured to circumferentially surround the second grip portion of the adapter device.
• the second grip portion of the adapter device comprises second protrusions, which are configured to engage in second recesses in the wrench device.
• the engagement of the second protrusions in the second recesses prevents the adapter device to rotate in relation to the wrench device.
• the engagement of the second protrusions in the second recesses will transfer of torque from the wrench device to the adapter device.
• the second grip portion of the adapter device may alternatively comprise recesses in which protrusions on the wrench device may engage in order to prevent the adapter device to rotate in relation to the wrench device.
• the second grip portion of the adapter device may be a polygonal portion.
• the polygonal portion of the adapter device may have shape similar to the grip portion of a nut or the head of a threaded bolt.
• polygonal portion of the adapter device may have six planargripping surfaces and six edges. The edges of the polygonal portion may comprise the second protrusions of the adapter device.
• the wrench device is a striking wrench or slugging wrench, comprising a handle provided with an anvil area.
• the anvil area may be connected to a machine, which exerts a force on the anvil area.
• Such machine may be a hydraulically, pneumatically or electrically driven machine.
• the handle may be a lever for transfer the exerted force on the anvil are to a torque on the adapter device connected to the wrench device.
• the force exerted on the anvil area may be exerted by mechanical tool of an operator, such as service personnel.
• the wrench device is a socket wrench, comprising a socket and a power tool.
• the socket may be connected to the power tool, which exerts a torque on the socket.
• the power tool may be a hydraulically, pneumatically or electrically driven power tool.
• the socket comprises the second recesses, which are configured to engage with the second grip portion of the adapter device.
• the socket may be releasably connected to the power tool, so that sockets of different configurations, adapted to the configuration of the adapter device, may be connected to the power tool.
• the present disclosure also relates to a rotatable shank pick for a working machine, the rotatable shank pick comprises a head portion, a shank portion connected to the head portion, and a drive profile, wherein the drive profile is configured to be connected to a first grip portion of a shank pick releasing tool disclosed herein.
• the shank portion of the rotatable shank pick is configured to be rotatably arranged in an aperture of the working machine.
• the aperture may be a through hole.
• the shank portion has a larger extension than the through hole.
• the rotatable shank pick is configured to be axially fixated in the working machine.
• the first grip portion has a shape that is adapted to fit with the shape of the drive profile of the rotatable shank pick.
• the first grip portion may have a shape that is complementary to the shape of the drive profile of the rotatable shank pick.
• the first grip portion and the rotatable shank pick may have shapes that allows the shank pick releasing tool to move axially in relation to the rotatable shank pick.
• the first grip portion and the rotatable shank pick have shapes that prevent the shank pick releasing tool to rotate in relation to the rotatable shank pick.
• the rotatable shank pick may be stuck in the aperture, which prevents the rotatable shank pick to rotate in the aperture.
• the rotatable shank pick may be rotatable released by the shank pick releasing tool.
• the shank pick releasing tool is configured to apply torque to the rotatable shank pick. The torque may be converted from a force exerted on the shank pick releasing tool.
• the axial fixation of the rotatable shank pick allows the rotatable shank pick to rotate.
• the axial fixation of the rotatable shank pick prevents the rotatable shank pick to be removed or fell out of the aperture.
• the working machine may be a drum cutter, which is configured to work into soil, asphalt, concrete or similar.
• the working machine may be any other type of working machine, which is configured to work into soil, asphalt, concrete or similar.
• the drive profile of the shank pick is configured to be circumferentially surrounded by the first grip portion of the shank pick releasing tool.
• the contact area between the shank pick releasing tool and the rotatable shank pick increases when the shank pick releasing tool is configured to circumferentially surround the drive profile. Therefore, a large torque may be transferred from the shank pick releasing tool to the rotatable shank pick when the shank pick releasing tool is configured to circumferentially surround the drive profile.
• the drive profile of the shank pick comprises first recesses which are configured to be engaged by first protrusions of the shank pick releasing tool.
• the drive profile of the rotatable shank pick has first recesses.
• the first protrusions of the shank pick releasing tool are configured to protrude into the first recesses of the drive profile the rotatable shank pick.
• the first protrusions engage in the first recesses when the first protrusions protrude into the first recesses.
• the present disclosure relates to a method for releasing a rotatable shank pick of a working machine, the rotatable shank pick comprising a head portion, a shank portion connected to the head portion, and a drive profile, wherein the drive profile is configured to be connected to a first grip portion of a shank pick releasing tool, the shank pick releasing tool comprising an adapter device with a first grip portion; and a wrench device, wherein the first grip portion is configured to be connected to the drive profile of the rotatable shank pick , wherein the first grip portion of the adapter device comprises first protrusions, which are configured to engage in first recesses in the drive profile of the rotatable shank pick, wherein the adapter device is configured to be coupled to the wrench device, and wherein the method comprises the steps of: connecting the first grip portion of the shank pick releasing tool to the drive profile of the rotatable shank pick; applying a torque to the rotatable shank pick by the shank pick releasing tool
• first grip portion of the shank pick releasing tool Connecting the first grip portion of the shank pick releasing tool to the drive profile of the rotatable shank pick.
• the connection of the first grip portion to the drive profile is possible due to the fact that the first grip portion and the drive profile have shapes that allows the shank pick releasing tool to move axially in relation to the drive profile. When connected, torque may be transferred from the shank pick releasing tool to the drive profile.
• Rotating the rotatable shank pick by the shank pick releasing tool is possible due to the torque transferred to the rotatable shank pick.
• the torque should be large enough to release a stuck rotatable shank pick in the working machine.
• the method comprises the steps of: applying a force in the axial direction of the rotatable shank pick; and displacing the rotatable shank pick from an aperture in the working machine.
• the force in the axial direction of the rotatable shank pick may be applied manually by a punch and a hammer by an operator. Applying the force in the axial direction of the rotatable shank pick will displace the rotatable shank pick axially in the aperture in the working machine.
• the method before the step of applying a force in the axial direction of the rotatable shank pick, the method comprises the step of: removing an axially locking element from the rotatable shank pick.
• the locking element may be a locking washer, a locking pin or a similar locking element.
• the locking element may be removed manually by an operator.
• Fig. 1 illustrates a view in perspective of a shank pick releasing tool 1 and a rotatable shank pick 2 according to an example.
• the shank pick releasing tool 1 is configured for releasing the rotatable shank pick 2.
• the rotatable shank pick 2 is configured to be axially fixated in a working machine 26 (see fig. 3b).
• the releasing tool 1 comprises an adapter device 8 with a first grip portion 4 and a wrench device 10.
• the first grip portion 4 is configured to be connected to a drive profile 6 of the rotatable shank pick 2.
• the first grip portion 4 of the adapter device 8 comprises first protrusions 12, which are configured to engage in first recesses 14 in the drive profile 6 of the rotatable shank pick 2.
• the adapter device 8 is configured to be coupled to the wrench device 10.
• the adapter device 8 comprises a second grip portion 16, which is configured for coupling the adapter device 8 to the wrench device 10.
• the second grip portion 16 of the adapter device 8 comprises second protrusions 18, which are configured to engage in second recesses 20 in the wrench device 10.
• the second grip portion 16 of the adapter device 8 is a polygonal portion.
• the adapter device 8 is an integrated portion of the wrench device 10, i.e., providing the wrench device with the above mentioned first grip portion configured to be connected to a drive profile 6 of the rotatable shank pick 2.
• the absence of an adapter device would be advantageous, e.g., in scenarios when release and subsequent fastening of a rotatable shank pick only involves shank picks having corresponding drive profiles.
• the first grip portion 4 is arranged in an inner circumferential portion of the adapter device 8.
• the adapter device 8 further comprises a second grip portion 16 arranged in an outer circumferential portion; the wrench device 10 comprising second recesses configured to engage with second protrusions 18 forming part of the second grip portion 16.
• the intermediary adapter device may be particularly beneficial, when there is a need to engage with a variety of shank picks, i.e., shank picks of different dimensions and/or drive profile.
• Fig. 2 illustrates a view in perspective of a shank pick releasing tool 1 and a rotatable shank pick 2 according to an example.
• the adapter device 8 is configured to be coupled to the wrench device 10.
• the first grip portion 4 of the adapter device 8 circumferentially surrounds the drive profile 6 of the rotatable shank pick 2.
• the adapter device 8 comprises a second grip portion 16, which is circumferentially surrounded by the wrench device 10 for coupling the adapter device 8 to the wrench device 10.
• the wrench device 10 is a striking wrench or slugging wrench, comprising a handle 22 provided with an anvil area 24.
• the anvil area may be connected to a machine, which exerts a force on the anvil area.
• the adapter device may be integrated with the wrench device, so that the first grip portion 4 is arranged as an inner circumferential portion of the wrench device.
• Fig. 3 illustrates a view in perspective of a shank pick releasing tool 1 and rotatable shank pick 2 according to an example.
• the shank pick releasing tool 1 comprises the wrench device 10, which is a socket wrench, comprising a socket 50 and a power tool 52.
• the socket 50 is configured to be connected to the power tool 52, which is configured to exert torque on the socket 50.
• the power tool 52 may be a hydraulically, pneumatically or electrically driven power tool 52.
• the socket 50 comprises the second recesses 20, which are configured to engage with the second grip portion 16 of the adapter device 8.
• the socket 50 is releasably connected to the power tool 52, so that sockets 50 of different configurations, adapted to the configuration of the adapter device 8, may be connected to the power tool 52.
• FIGs 4a and 4b illustrate a view from above and a side view of a rotatable shank pick 2 according to an example.
• the rotatable shank pick 2 comprises a head portion 28, a shank portion 30 connected to the head portion 28, and a drive profile 6.
• the rotatable shank pick 2 is fixed in the axial direction in the aperture 42 or a cavity in the working machine 26 by an axially locking element 40.
• the locking element 40 may be a locking washer, a locking pin or a similar locking element.
• the locking element 40 may be arranged in a circumferentially recess 44 arranged in the shank portion 30.
• the drive profile 6 of the shank pick 2 comprises first recesses 14 which are configured to be engaged by first protrusions 12 (fig.l) of the shank pick releasing tool 1 (fig. 1).
• Fig. 5 illustrates side views of a working machine 26 with rotatable shank picks 2 according to an example.
• the working machine 26 may be a drum cutter, which is configured to work into soil, asphalt, concrete or similar.
• the working machine 26 may be any other type of working machine 26, which is configured to work into soil, asphalt, concrete or similar.
• the working machine 26 comprises an attachment unit 55 for connecting the working machine 26 to an industrial machine (not disclosed).
• Fig. 6 shows a flowchart of a method according to an example.
• the method thus relates to a method for releasing a rotatable shank pick 2 of a working machine 26 by the shank pick releasing tool disclosed in figures 1 and 2.
• the rotatable shank pick 2 comprising a head portion 28, a shank portion 30 connected to the head portion 28, and a drive profile 6, wherein the drive profile 6 is configured to be connected to a first grip portion 4 of a shank pick releasing tool 1.
• the shank pick releasing tool 1 comprising an adapter device 8 with a first grip portion 4; and a wrench device 10, wherein the first grip portion 4 is configured to be connected to the drive profile 6 of the rotatable shank pick 2, wherein the first grip portion 4 of the adapter device 8 comprises first protrusions 12, which are configured to engage in first recesses 14 in the drive profile 6 of the rotatable shank pick 2, wherein the adapter device 8 is configured to be coupled to the wrench device 10.
• Fig. 7 shows a flowchart of a method according to an example.
• the method according to this example comprising: connecting slOl the first grip portion 4 of the shank pick releasing tool 1 to the drive profile 6 of the rotatable shank pick 2; applying sl02 a torque to the rotatable shank pick 2 by the shank pick releasing tool 1; and rotating sl03 the rotatable shank pick 2 by the shank pick releasing tool 1.
• the method further comprising: applying sl04 a force in the axial direction of the rotatable shank pick 2; and displacing sl05 the rotatable shank pick 2 from an aperture 42 in the working machine 26.
• the method comprises the step of: removing sl06 an axially locking element 40 from the rotatable shank pick 2.

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• Engineering & Computer Science (AREA)
• Mining & Mineral Resources (AREA)
• Mechanical Engineering (AREA)
• Life Sciences & Earth Sciences (AREA)
• General Life Sciences & Earth Sciences (AREA)
• Geochemistry & Mineralogy (AREA)
• Geology (AREA)
• Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)

Applications Claiming Priority (1)

Publications (1)

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• 2021
  • 2021-08-12 WO PCT/EP2021/072478 patent/WO2023016648A1/en unknown
  • 2021-08-12 EP EP21763045.8A patent/EP4384692A1/de active Pending

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