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
  • E21C35/19—Means for fixing picks or holders
  • E21C35/197—Means for fixing picks or holders using sleeves, rings or the like, as main fixing elements
• • 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
  • E21C35/183—Mining picks; Holders therefor with inserts or layers of wear-resisting material
• • 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
• • 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
  • E21C35/187—Mining picks; Holders therefor with arrangement of fluid-spraying nozzles

Definitions

• the present invention relates to mining machines. Specifically, the present invention relates to a cutting bit assembly for a mining machine.
• each cutting bit assembly includes a bit holder block coupled to a rotating drum.
• a water spray nozzle is positioned within the bit holder block, and the bit holder block includes a passage for providing water to the spray nozzle.
• the bit holder block also includes a slot for receiving a sleeve.
• the sleeve includes an outer surface engaging the slot of the bit holder block and a bore. The bit is secured within the bore of the sleeve
• a cutting bit assembly for a mining machine includes a block, a bit sleeve, and a seal.
• the block defines a first end surface and a second end surface opposite the first end surface.
• the block includes a first bore and a fluid passage.
• the first bore extends through the first end surface and at least partially through the block toward the second end surface.
• the fluid passage includes a first portion and a second portion in fluid communication with the first portion.
• the first portion is oriented obliquely with respect to the first bore, and the second portion extends at least partially around the perimeter of the first bore.
• the bit sleeve includes a shank, a flange, and a second bore extending through the shank and the flange.
• the shank is positioned within the first bore of the block such that a surface of the flange engages the first end surface of the block.
• the seal is positioned between the second portion of the fluid passage and the shank to prevent contact between a fluid in the fluid passage and the outer surface of the shank.
• a cutting bit assembly for a mining machine includes a block, a bit sleeve, and a seal.
• the block defines a first end surface and a second end surface opposite the first end surface, and the block includes a first bore and a fluid passage.
• the first bore defines a first opening in the first end surface and a second opening in the second end surface.
• the fluid passage includes a first portion and a second portion, and the second portion extends at least partially around the perimeter of the first bore and proximate the second opening.
• the bit sleeve includes a shank, a flange, and a second bore extending through the shank and the flange.
• the shank is positioned within the first bore of the block such that a surface of the flange engages the first surface of the block.
• the seal is positioned in the first bore such that the seal defines an inner wall of the second portion of the fluid passage.
• a cutter head for a mining machine includes a drum rotatable about a drum axis and including an outer surface, and a plurality of cutting bit assemblies coupled to the outer surface of the drum.
• Each cutting bit assembly includes a block, a bit sleeve, a bit, and a seal.
• the block defines a first end surface and a second end surface opposite the first end surface, and the block includes a first bore and a fluid passage.
• the first bore extends through the first end surface and at least partially through the block toward the second end surface.
• the fluid passage includes a first portion and a second portion in fluid
• the bit sleeve includes a first shank, a flange, and a second bore extending through the first shank and the flange.
• the first shank is positioned within the first bore of the block such that a surface of the flange engages the first end surface of the block.
• the bit includes a second shank, a shoulder, and a tip.
• the second shank is positioned within the second bore of the sleeve such that the shoulder abuts the flange of the sleeve.
• the seal is positioned between the second portion of the fluid passage and the first shank to prevent contact between a fluid in the fluid passage and the outer surface of the first shank.
• a cutting bit assembly for a mining machine includes a block, a bit sleeve, a bit, and a seal assembly.
• the block defines a first end surface and a second end surface opposite the first end surface.
• the block includes a first bore and a fluid passage.
• the first bore extends through the first end surface and at least partially through the block toward the second end surface.
• the fluid passage includes a first portion and a second portion in fluid communication with the first portion.
• the first portion is oriented obliquely with respect to the first bore, while the second portion extends at least partially around the perimeter of the first bore.
• the second portion defines a first edge surface and a second edge surface.
• the bit sleeve includes a first shank, a flange, and a second bore extending through the first shank and the flange.
• the first shank is positioned within the first bore of the block such that a surface of the flange engages the first end surface of the block.
• the bit includes a second shank, a shoulder, and a tip.
• the second shank is positioned within the second bore of the sleeve such that the shoulder abuts the flange of the sleeve.
• the seal assembly is secured to the first shank and includes a first O-ring seal and a second O-ring seal.
• the first O-ring seal extends around the first shank proximate the first edge surface.
• the second O-ring seal extends around the first shank proximate the second edge surface.
• Each O-ring seal is removable with the first shank when the first shank is removed from the first bore.
• FIG. 1 is a perspective view of a mining machine.
• FIG. 2 is a perspective view of a portion of a cutter head.
• FIG. 3 is a perspective view of a cutting bit assembly.
• FIG. 4 is a side section view of the cutting bit assembly of FIG. 3 with a bit and fluid nozzles removed, and viewed along a section plane extending parallel to an axis of a bore in holder block.
• FIG. 5 is a perspective section view of the cutting bit assembly of FIG. 3 with a bit and fluid nozzles removed.
• FIG. 6 is a side section view of a cutting bit assembly with a seal according to another embodiment.
• FIG. 7 is a side section view of a cutting bit assembly according to another embodiment, with a bit and fluid nozzles removed.
• FIG. 8 is an exploded top view of a cutting bit assembly according to another embodiment, with a bit and fluid nozzles removed.
• FIG. 9 is an exploded side section view of the cutting bit assembly of FIG. 8 viewed along section 9—9, with a bit and fluid nozzles removed.
• FIG. 10 is a perspective view of a holder block according to another embodiment.
• FIG. 11 is a perspective view of a holder block according to another embodiment. DETAILED DESCRIPTION
• FIG. 1 illustrates a mining machine, such as a continuous miner 10, including a frame 14 that is supported for movement by tracks 18.
• the continuous miner 10 further includes a boom 22 and a cutter head 26 supported on the boom 22.
• the frame 14 also includes a gathering head 30 and a conveyor 34 extending from a first or front end of the frame 14 toward a second or rear end of the frame 14.
• the gathering head 30 includes a pair of rotating arms 38 that engage cut material below the cutter head 26 and direct the cut material onto the conveyor 34.
• the conveyor 34 transports the cut material along a longitudinal axis of the frame 14, from the area below the cutter head 26 to a second conveyor (not shown) positioned proximate the second end of the frame 14.
• the boom 22 includes one end pivotably coupled to the frame 14 and another end supporting the cutter head 26.
• the boom 22 is pivotable about a pivot axis 54 that is generally transverse to the longitudinal axis of the frame 14.
• the boom 22 is pivoted by a pair of actuators 58 that are coupled between the frame 14 and the boom 22.
• the actuators 58 are hydraulic jacks or cylinders.
• the cutter head 26 is formed as an elongated drum 62 including cutting bit assemblies 66 secured to an outer surface of the drum 62.
• the outer surface of the drum 62 includes multiple pedestals 68, and each cutter bit assembly 66 is secured to one of the pedestals 68.
• the drum 62 defines a drum axis 70 (FIG. 1) that is generally parallel to the pivot axis 54 of the boom 22, and the drum 62 is rotatable about the drum axis 70.
• each cutting bit assembly 66 includes a bit 74, a sleeve 78, and a holder block 82.
• the bit 74 includes a first portion 86 having a tip 88 for engaging a mine face to remove material, and a second portion or shank 90.
• the first portion 86 defines a shoulder 94.
• the sleeve 78 defines a first end 98 and a second end 102, and the sleeve 78 includes a first portion 106, a flange 110, and a bore 114 extending through both the first portion 106 and the flange 110.
• the flange 110 is positioned adjacent the first end 98 of the sleeve 78 and defines an abutment surface 118.
• the shank 90 of the bit 74 is positioned within the bore 114, and the shoulder 94 abuts the first end 98 of the sleeve 78.
• the shank 90 is received in the bore 114 by a clearance fit and is retained by a clip (not shown).
• the shank 90 may be press fit within the bore 114.
• a seal 126 is secured to an outer surface of the first portion 106. In the illustrated embodiment, a portion of the first portion 106 is tapered.
• the holder block 82 defines a first or front end surface 134, a second or rear end surface 138, a third or lower surface 142, and a fourth or upper surface 146.
• the lower surface 142 is secured to the one of the pedestals 68 (FIG. 2).
• the holder block 82 includes a first bore or slot 150 extending through the first end surface 134. In the illustrated embodiment, the slot 150 has a circular profile.
• the holder block 82 also includes an aperture 154 for supporting a fluid nozzle 158 (FIG. 6), and the aperture 154 is positioned between the upper surface 146 and the slot 150.
• the nozzle 158 provides a spray envelope 160 (FIG.
• the holder block 82 includes a first passage 162 for providing fluid to the nozzle 158.
• the first passage 162 includes a first portion extending from the lower surface 142 to the aperture 154 and includes a second portion or annular portion 166 extending around the perimeter of the slot 150. The first portion intersects the annular portion 166. In the illustrated embodiment, the first portion extends along a straight line through the slot 150 and is
• the first portion may form a different angle relative to the axis of the slot 150, or the first portion may be oriented skew relative to the axis of the slot 150.
• the first portion may be oriented in a plane that is perpendicular to the axis of the slot 150, such that the first portion forms an angle relative to a side surface of the block 82.
• the term "oblique" refers to condition in which two directions or features are oriented at any angle relative to one another other than parallel. This includes conditions in which the two features are perpendicular to one another, are skew (i.e., non-intersecting) relative to one another, or the two features form an acute angle relative to one another.
• the holder block 82 also includes a lateral opening 170 extending between sides of the holder block 82 such that the slot 150 extends between the first end surface 134 and the lateral opening 170, as well as a second opening 174 extending between the rear end surface 138 and the lateral opening 170.
• the illustrated holder block 82 further includes a second aperture 182 for supporting a second fluid nozzle 186 (FIG. 6), and the second aperture 182 is positioned between the slot 150 and the lower surface 142.
• the second nozzle 186 provides a spray envelope 188 (FIG. 3) that encompasses a lower surface of the bit 74 proximate the tip 88.
• the spray envelope 188 has a conical shape.
• the holder block 82 includes a second passage 190 extending from the lower surface 142 to the second aperture 182.
• the first portion 106 of the sleeve 78 is positioned within the slot 150 and the abutment surface 118 engages the first end surface 134 of the holder block 82.
• the sleeve 78 is press fit within the slot 150 and further secured relative to the holder block 82 by a clip 194 extending around a portion of the sleeve 78 positioned in the lateral opening 170.
• the seal 126 is positioned adjacent the annular portion 166 of the first passage 162. The sleeve 78 is retained within the slot 150, thereby applying pressure on the seal 126 against the annular portion 166.
• the seal 126 is wider than the annular portion 166 such that the seal 126 engages (i.e., seals) both edges of the annular portion 166 and inhibit fluid from contacting the outer surface of the sleeve 78 or from escaping from the first passage 162.
• the seal 126 engages (i.e., seals) both edges of the annular portion 166 and inhibit fluid from contacting the outer surface of the sleeve 78 or from escaping from the first passage 162.
• the seal 126 is positioned on a tapered portion of the sleeve 78.
• the seal 126 and the mating surface of the holder block 82 form a grooved profile to provide a high focus point to form a reliable seal and crevice corrosion stopping point.
• FIG. 6 shows another embodiment of the cutting bit assembly 566 in which the seal 526 is formed as a pair of O-rings 526a, 526b positioned on either side of the annular portion 166.
• the first portion 106 sleeve 78 contains grooves 508 for receiving the O-ring seals 526a, 526b and retaining the seals within the slot 150.
• fluid in the annular portion 166 contacts the shank 90 but is sealed from escaping between the slot 150 and the sleeve 78.
• FIG. 7 shows another embodiment of the holder block 782 and the sleeve 778 in which the seal is a bushing 726 that is press fit within the slot 750 of the holder block 782 such that the bushing 726 remains in position in the slot 750 even when the sleeve 778 is removed from the slot 750.
• the bushing 726 can be removed to clean out the first passage 762.
• the sleeve 778 provides pressure on the bushing 726 when the sleeve 778 is inserted in the slot 750.
• FIGS. 8 and 9 show another embodiment of the holder block 982 and sleeve 978 in which a portion of the sleeve first portion 906 is coated with a high-temperature, cured sealant material 926.
• a relief 908 (FIG. 9) is formed on an outer surface of the first portion 906 of the sleeve 978, and the sealant 926 is electrostatically applied to the relief 908 and then heated to form a pliable skin.
• the slot 950 includes engagement surfaces 952 (FIG. 9) on either side of the annular portion 966, such that the surfaces 952 contact the sealant 926 when the sleeve 978 is press fit into the slot 950.
• FIG. 10 illustrates another embodiment of the holder block 1182 and sleeve 1178 in which the first passage 1162 includes an annular portion 1166 extending around the perimeter of the second opening 1174 rather than passing around the perimeter of the slot 1150.
• a connector 1126 is inserted into the second opening 1174 to seal the annular portion 1166.
• the connector 1126 is a nut or other threaded connector.
• the connector 1326 is a bushing or ring that is press fit into the second opening 1174.
• the invention provides, among other things, cutting bit assembly for a mining machine.

Landscapes

• 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)
• Earth Drilling (AREA)
• Drilling And Exploitation, And Mining Machines And Methods (AREA)
• Processing Of Stones Or Stones Resemblance Materials (AREA)

Priority Applications (8)

Applications Claiming Priority (1)

Publications (1)

Family

ID=56543927

Family Applications (1)

Country Status (5)

Families Citing this family (1)

Citations (5)

Family Cites Families (5)

• 2015
  • 2015-01-28 CN CN201580077290.2A patent/CN107407146B/zh active Active
  • 2015-01-28 CN CN202010597926.9A patent/CN111706326B/zh active Active
  • 2015-01-28 GB GB1713521.1A patent/GB2550096A/en not_active Withdrawn
  • 2015-01-28 WO PCT/US2015/013370 patent/WO2016122502A1/en active Application Filing
  • 2015-01-28 AU AU2015380665A patent/AU2015380665B2/en active Active
• 2017
  • 2017-07-20 ZA ZA2017/04938A patent/ZA201704938B/en unknown
• 2021
  • 2021-07-08 AU AU2021204803A patent/AU2021204803B2/en active Active
• 2023
  • 2023-05-22 AU AU2023203206A patent/AU2023203206A1/en active Pending

Patent Citations (5)

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