EP2969302B1 - System and method of producing mine roof bolts - Google Patents
System and method of producing mine roof bolts Download PDFInfo
- Publication number
- EP2969302B1 EP2969302B1 EP14778774.1A EP14778774A EP2969302B1 EP 2969302 B1 EP2969302 B1 EP 2969302B1 EP 14778774 A EP14778774 A EP 14778774A EP 2969302 B1 EP2969302 B1 EP 2969302B1
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- European Patent Office
- Prior art keywords
- assembly
- bars
- bar
- die
- conveyor
- Prior art date
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- 238000000034 method Methods 0.000 title claims description 29
- 238000000429 assembly Methods 0.000 claims description 27
- 230000000712 assembly Effects 0.000 claims description 27
- 238000005242 forging Methods 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 10
- 239000011347 resin Substances 0.000 description 11
- 229920005989 resin Polymers 0.000 description 11
- 239000011435 rock Substances 0.000 description 10
- 230000015572 biosynthetic process Effects 0.000 description 6
- 238000005755 formation reaction Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 238000001125 extrusion Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000000641 cold extrusion Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000001192 hot extrusion Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000011342 resin composition Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/44—Making machine elements bolts, studs, or the like
- B21K1/46—Making machine elements bolts, studs, or the like with heads
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
- B21J5/08—Upsetting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J9/00—Forging presses
- B21J9/02—Special design or construction
- B21J9/06—Swaging presses; Upsetting presses
- B21J9/08—Swaging presses; Upsetting presses equipped with devices for heating the work-piece
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/06—Making machine elements axles or shafts
Definitions
- the processing station may include an extruder assembly, and processing the portion of each of the plurality of bars may include: passing a portion of a first bar of the plurality of bars through the extruder assembly; actuating a die cylinder to move a die holder assembly toward the first bar; and extruding a portion of the first bar.
- the method may include, after extruding the portion of the first bar, moving the first bar along the conveyor toward a second extruder assembly, passing the portion of the first bar of the plurality of bars through the second extruder assembly, actuating a die cylinder to move a die holder assembly toward the first bar, and further extruding the portion of the first bar.
- the at least one extruder die assembly may include a die cylinder, a die holder, and a tool received by the die holder with the die holder moveable between a retracted and extended position via the die cylinder.
- the extruder assembly is configured to extrude a portion of the bar.
- the system may further include an index cylinder and a stop plate that are configured to index the longitudinal position of a bar positioned on the conveyor with the index cylinder moveable between first and second positions and configured to move a bar until the bar contacts the stop plate.
- the system may further include a receptacle positioned adjacent to an end of the conveyor with the plurality of indexing clamps configured to release the bars and deposit the bars into the receptacle.
- the extruder die assemblies 44, 46, 48 each include a die cylinder 68, a die holder assembly 70, and upper and lower clamping assemblies 72, 74.
- the die cylinders 68 and die holder assemblies 70 are each supported by respective die support plates 76 that are received by the frame support plates 58 and generally extend parallel to the frame plates 52.
- Each die cylinder 68 includes a die cylinder rod 78 that is secured to the respective die holder assemblies 70.
- the die cylinder rod 78 can be actuated between a retracted and fully extended position with corresponding movement of the respective die holder assembly 70.
- the die cylinder 68 is a hydraulic cylinder, although other suitable arrangements for displacing the die holder assembly 70 may be utilized.
- a further embodiment of the processing station 16 includes a header assembly 120.
- the header assembly 120 is configured to form the head 28, as described above, on the bar 20 or mine roof bolt 26.
- the header assembly 120 is embodied as a forging mechanism, although other suitable arrangements may be provided to form the head 28.
- the mine roof bolt 26 is heated by the heating source 14 shown in Fig. 1 before reaching the header assembly 120.
- the header assembly 120 may be similar to the extruder assembly 40 discussed above and shown Figs. 3-11 .
- the header assembly 120 would also include the die cylinder 68 and upper and lower clamping assemblies 72, 74.
- the header assembly 120 also includes frame plates 122 that are different from the frame plates 52 of the extruder assembly 40, although the header assembly 120 may also utilize the same components of the extruder assembly 40 with different tooling being utilized.
- the frame plates 122 of the header assembly 120 are each formed with separate upper and lower portions 124, 126 that are secured to each other and to adjacent frame plates 122.
- the frame plates 122 define a single opening 128 and are each configured to receive bars 20 or mine roof bolts 26 for the forging process.
- the header assembly 120 includes first and second cone assemblies 130, 132 and an insert assembly 134 rather than the extruder die assemblies 44, 46, 48 of the extruder assembly 40.
- Each cone assembly 130, 132 includes a body 136 that receives a cone tool 138. Although shown in front of the cone tool 138, a tool spacer 140 and washer 142 are positioned behind the cone tool 138 with a cover plate 144 secured to the body 136 to fix the cone tool 138 within the body 136. Each cone assembly 130, 132 is actuated between an extended position and a retracted position in the same manner as discussed above in connection with the extrude die assemblies 44, 46, 48 of the extruder assembly 40.
- the bars 20 or mine roof bolts 26 may be fed through the header assembly 120 in the same manner as discussed above in connection with the extruder assembly 40.
- the head 28 of the mine roof bolt 26 may be formed by first and second forging processes performed by the first and second cone assemblies 130, 132 to progressively form a cone shape on an end of the bar 20 and a third forging process performed by the insert assembly 134 to provide the final shape and dimension of the head 28 shown in Figs. 2A and 2B .
- the header assembly 120 may include one or more forging processes to provide the final head shape and size.
- the threading assembly 162 also includes a support stand 198 having first and second paddles 202, 204 that are each configured to receive the mine roof bolt 26 for positioning the mine roof bolt 26 between the moving and stationary dies 188, 196.
- the first and second paddles 202, 204 are also configured to pivot downwardly when engaged and return to their original position.
- the first and second paddles 202, 204 may include a spring mechanism (not shown) to return the paddles 202, 204 to their original position after pivoting downward.
- the threading assembly 162 includes a pusher member 206 that is moveable between a retracted and extended position by a pusher cylinder 208.
- the pusher member 206 is moved to the extended position and is configured to engage a mine roof bolt 26 positioned on the first and second paddles 202, 204.
- the pusher member 206 further causes the paddles 202, 204 to pivot downward and ensures that the mine roof bolt 26 is positioned between the moving and stationary dies 188, 196 once the threading operation is commenced.
- the threading assembly 162 is configured to receive the mine roof bolt 26 between the stationary die 196 and the moving die 188 and moving the moving die 188 to roll the mine roof bolt 26 and form threads on a portion of the mine roof bolt 26.
- the end of the mine roof bolt 26 to be threaded may be fed through the opening 178 in the front plate 176 and supported by the paddles 202, 204 of the support stand 198.
- the indexing clamps 222 are secured to the drive member 218 and are configured to be spaced apart as they rotate about the drive sprockets 220. In particular, as shown in Fig. 19 , the indexing clamps 222 separate as they rotate around the drive sprocket 220 and receive the bar 20 from the feed wheel 216. As the indexing clamps 222 move beyond the drive sprocket 220, the indexing clamps 222 are moved back together to receive and index the bars 20.
- the feed and indexing assembly 212 further includes an index cylinder 226 and a stop plate 228 that are configured to index the longitudinal position of the bars 20 or mine roof bolts 26.
- the index cylinder 226 includes an engagement 230 that is moveable between first and second positions and is configured to engage the bars 20 and move them in a longitudinal direction.
- the bars 20 are engaged by the engagement 230 of the index cylinder 226 until the bars 20 abut the stop plate 228 to ensure that the bars 20 have a proper longitudinal orientation before entering the processing stations 16.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Description
- Mine roof bolts are used to reinforce unsupported rock formations adjacent to a mine opening. In particular, the roof of a mine is conventionally supported by tensioning the roof with steel bolts inserted into bore holes drilled in the mine roof that reinforce the unsupported rock formation above the mine roof. The mine roof bolt may be anchored mechanically to the rock formation by engagement of an expansion assembly on the distal end of the mine roof bolt with the rock formation. Alternatively, the mine roof bolt may be adhesively bonded to the rock formation with a resin bonding material inserted into the bore hole. A combination of mechanical anchoring and resin bonding may also be employed by using both an expansion assembly and resin bonding material.
- A mechanically anchored mine roof bolt typically includes an expansion assembly threaded onto a distal threaded end of the bolt shaft and a drive head for rotating the bolt. A mine roof plate is positioned between the drive head and the mine roof surface. The expansion assembly generally includes a multi-prong shell supported by a threaded ring and a plug threaded onto the end of the bolt. When the prongs of the shell engage with rock surrounding a bore hole, and the bolt is rotated about its longitudinal axis, the plug threads downwardly on the shaft to expand the shell into tight engagement with the rock thereby placing the bolt in tension between the expansion assembly and the mine roof surface.
- When resin bonding material is utilized, the bonding material penetrates the surrounding rock formation to adhesively join the rock strata and to firmly hold the roof bolt within the bore hole. Resin is typically inserted into the mine roof bore hole in the form of a two component plastic cartridge having one component containing a curable resin composition and another component containing a curing agent (catalyst). The two component resin cartridge is inserted into the blind end of the bore hole and the mine roof bolt is inserted into the bore hole such that the end of the mine roof bolt ruptures the two component resin cartridge. Upon rotation of the mine roof bolt about its longitudinal axis, the compartments within the resin cartridge are shredded and the components are mixed. The resin mixture fills the annular area between the bore hole wall and the shaft of the mine roof bolt. The mixed resin cures and binds the mine roof bolt to the surrounding rock. The mine roof bolt is typically rotated via a drive head. With bolts that are point anchored and tensioned, a breakaway nut may be used to rotate the bolt and subsequently tension the bolt upon curing of the resin bonding material.
- A system and a method for producing mine roof bolts is e.g. known from
KR10-0303490 - A system and a method for producing a mine roof bolt according to the present invention are defined in the independent claims 1 and 8.
- According to the disclosure, a method of producing a mine roof bolt includes providing a plurality of bars of a predetermined length, moving the plurality of bars along a conveyor and indexing the position of the plurality of bars, and passing a portion of each of the plurality of bars through a processing station, where the processing station comprises at least one of a header assembly, an extruder assembly, and a threading assembly. The method further includes processing a portion of each of the plurality of bars with the processing station.
- The method may further include where both a longitudinal and lateral position of the plurality of bars is indexed. The processing station may include a header assembly, and processing the portion of each of the plurality of bars may include: heating a portion of a first bar of the plurality of bars; passing the portion of the first bar through the header assembly; and forging a head at an end of the first bar. The method may further include actuating clamping assemblies to fix the position of the first bar during forging. The processing station may include an extruder assembly, and processing the portion of each of the plurality of bars may include: passing a portion of a first bar of the plurality of bars through the extruder assembly; actuating a die cylinder to move a die holder assembly toward the first bar; and extruding a portion of the first bar. The method may include, after extruding the portion of the first bar, moving the first bar along the conveyor toward a second extruder assembly, passing the portion of the first bar of the plurality of bars through the second extruder assembly, actuating a die cylinder to move a die holder assembly toward the first bar, and further extruding the portion of the first bar. The method may include moving each of the plurality of bars from a feed rack to the conveyor using a feed delivery device. The movement of the conveyor and the feed delivery device may be synchronized. The method may include, after processing the portion of the bar, continuing to move the bar along the conveyor and depositing each of the plurality of bars into a receptacle.
- According to the disclosure, a system for producing a mine roof bolt includes a conveyor configured to index and transport a bar, a feed arrangement configured to continuously deliver bars to the conveyor, a processing station comprising at least one of a header assembly, an extruding assembly, and a threading assembly. The processing station is positioned along the conveyor and configured to receive and process a portion of the bars.
- The feed arrangement includes a feed rack and a feed wheel positioned adjacent to the feed rack with the feed wheel configured to receive bars from the feed rack and to deliver the bars to the conveyor. The conveyor includes a drive member and at least two drive sprockets with the drive member forming a continuous loop and extending circumferentially around the at least two drive sprockets. The drive member includes a plurality of indexing clamps with the plurality of indexing clamps configured to receive the bars and index a lateral position of the bars relative to adjacent bars. The system may further include a heating source configured to heat a portion of the bar and the processing station may be a header assembly. The header assembly may include a frame assembly, upper and lower clamp assemblies, and at least one header die assembly with the upper and lower clamp assemblies configured to engage a portion of the bar. The at least one header die assembly may include a die cylinder, a die holder, and a tool received by the die holder with the die holder moveable between a retracted and extended position via the die cylinder. The header assembly is configured to form a head at an end of the bar. The processing station may be an extruder assembly with the extruder assembly including a frame assembly, upper and lower clamp assemblies, and at least one extruder die assembly. The upper and lower clamp assemblies are configured to engage a portion of the bar. The at least one extruder die assembly may include a die cylinder, a die holder, and a tool received by the die holder with the die holder moveable between a retracted and extended position via the die cylinder. The extruder assembly is configured to extrude a portion of the bar.
- The processing station may be a threading assembly that includes a frame assembly, a moving die assembly, and a stationary die assembly with the moving die assembly movable relative to the frame assembly and the stationary die assembly via a threading die cylinder. The moving die assembly and the stationary die assembly are configured to form threads on a portion of the rod. The threading assembly may further include a support stand having first and second paddles with the first and second paddles each configured to initially support the rod prior to forming threads on a portion of the rod. The first and second paddles are movable in a downward direction. The system may further include an index cylinder and a stop plate that are configured to index the longitudinal position of a bar positioned on the conveyor with the index cylinder moveable between first and second positions and configured to move a bar until the bar contacts the stop plate. The system may further include a receptacle positioned adjacent to an end of the conveyor with the plurality of indexing clamps configured to release the bars and deposit the bars into the receptacle.
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Fig. 1 is a top schematic view of a system and method of producing a mine roof bolt according to one embodiment of the present invention. -
Fig. 2A is a front view of a conventional mine roof bolt. -
Fig. 2B is a bottom view of the mine roof bolt shown inFig. 2A . -
Fig. 3 is a front perspective view of an extruder assembly according to one embodiment of the present invention. -
Fig. 4 is a rear perspective view of the extruder assembly shown inFig. 3 . -
Fig. 5 is a front view of the extruder assembly shown inFig. 3 . -
Fig. 6 is a top view of the extruder assembly shown inFig. 3 . -
Fig. 7 is a partial rear perspective view of the extruder assembly shown inFig. 3 . -
Fig. 8 is a partial right side view of the extruder assembly shown inFig. 3 . -
Fig. 9 is a cross-sectional view of the extruder assembly shown inFig. 3 . -
Fig. 10 is an exploded perspective view of an extruder die holder assembly according to one embodiment of the present application. -
Fig. 11 is cross-sectional view of the extruder die holder assembly shown inFig. 10 . -
Fig. 12 is a perspective view of a header assembly according to one embodiment of the present invention. -
Fig. 13 is a rear perspective view of the header assembly shown inFig. 12 . -
Fig. 14 is an exploded perspective view of a header die assembly according to one embodiment of the present invention. -
Fig. 15 is a right perspective view of a threading assembly according to one embodiment of present invention. -
Fig. 16 is a left perspective view of the threading assembly shown inFig. 15 . -
Fig. 17 is a top view of the threading assembly shown inFig. 15 . -
Fig. 18 is a right rear perspective view of the threading assembly according to one embodiment of the present invention. -
Fig. 19 is a front schematic view of a feed and indexing assembly according to one embodiment of the present invention. -
Fig. 20 is a top schematic view of the feed and indexing assembly shown inFig. 19 . - For purposes of the description hereinafter, the terms "upper", "lower", "right", "left", "vertical", "horizontal", "top", "bottom", and derivatives thereof, shall relate to the invention as it is oriented in the drawing figures. However, it is to be understood that the invention may assume various alternative variations and step sequences, except where expressly specified to the contrary. It is also to be understood that the specific devices and processes illustrated in the attached drawings, and described in the following specification, are simply exemplary embodiments of the invention. Hence, specific dimensions and other physical characteristics related to the embodiments disclosed herein are not to be considered as limiting.
- Referring to
Fig. 1 , one embodiment of asystem 10 for producing a mine roof bolt includes aconveyor 12, aheating source 14, aprocessing station 16, and a cradle orreceptacle 18 for receiving finishing product.Raw bars 20, such as rebar, are fed to a first end of theconveyor 12. Thebars 20 may be placed in a holding rack and picked up through a bar separator that will index and position thebars 20 on theconveyor 12. Thebars 20 are fed into theheating source 14, such as an induction heating coil, and a predetermined portion of eachbar 20 is heated to an appropriate forging temperature. Thebars 20 are then indexed along theconveyor 12 and moved to theprocessing station 16 for further processing. One embodiment of the feed and indexing assembly, which providesbars 20 from a holding rack and indexes the position of thebars 20, is discussed in more detail below and shown inFigs. 19 and 20 . Theprocessing station 16 may be a hydraulic forging assembly that forms a head on an end of thebar 20, which is discussed in more detail below. After being processed at theprocessing station 16, thebars 20 are moved to a discharge position that will deposit the finished bars in thecradle 18 for collection and movement to further processing. Such further processing may include extrusion and/or threading processes, which are also discussed in more detail below. Further, althoughFig. 1 only shows asingle processing station 16, thesystem 10 may include one ormore processing stations 16 that are automated to allow raw bar material to be fed and indexed on theconveyer 12 and processed by the one ormore processing stations 16 to provide a finished mine roof bolt. - Referring to
Figs. 2A and 2B , thesystem 10 shown inFig. 1 may be utilized to produce amine roof bolt 26 having ahead 28 formed on afirst end 30 that is positioned opposite from asecond end 32. Thehead 28 includes aflange 34 and a four-sided square-shapedprotrusion 36 that is configured to engage a drive tool, although the system may be used to form other types of head configurations. Themine roof bolt 26 may also be further processed by extruding thesecond end 32 and/or threading thesecond end 32 of themine roof bolt 26. The threaded second end (not shown) may be used to receive an expansion assembly (not shown) as noted in the background section above. Rather than providing an integral head on thefirst end 30 of themine roof bolt 26, thefirst end 30 of themine roof bolt 26 may be extruded and threaded so that thefirst end 30 can receive a nut (not shown) or other suitable tensioning arrangement. - Referring to
Figs. 3-11 , one embodiment of theprocessing station 16 includes anextruder assembly 40. Theextruder assembly 40 performs a cold extrusion process and does not require theheating source 14 shown inFig. 1 , although theextruder assembly 40 may also be utilized in hot extrusion process where theheating source 14 is needed. Theextruder assembly 40 is used to extrude the first and/or second ends 30, 32 of themine roof bolt 26 to form a smooth surface. Theextruder assembly 40 includes aframe assembly 42 and first, second, and third extruder dieassemblies frame assembly 42 includes four spaced apartframe plates 52 that are secured together. Eachframe plate 52 is generally square-shaped and defines first andsecond openings frame plates 52 are secured to each other with aframe support plate 58 that is received by thefirst opening 54 of eachframe plate 52 with theframe support plate 58 extending perpendicularly between theframe plates 52. Theframe support plate 58 is secured to theframe plates 52 withangle brackets 60. Theframe plates 52 are also secured to each other via first andsecond grip plates second opening 56 of eachframe plate 52 is configured to allowmine roof bolts 26 to be received by theextruder assembly 40. Further, as shown more clearly inFig. 7 , a plurality ofspacer plates 66 is positioned betweenadjacent frame plates 52. - Referring still to
Figs. 3-11 , the extruder dieassemblies die cylinder 68, adie holder assembly 70, and upper andlower clamping assemblies die cylinders 68 and dieholder assemblies 70 are each supported by respectivedie support plates 76 that are received by theframe support plates 58 and generally extend parallel to theframe plates 52. Each diecylinder 68 includes adie cylinder rod 78 that is secured to the respectivedie holder assemblies 70. Thedie cylinder rod 78 can be actuated between a retracted and fully extended position with corresponding movement of the respectivedie holder assembly 70. Thedie cylinder 68 is a hydraulic cylinder, although other suitable arrangements for displacing thedie holder assembly 70 may be utilized. Each of theupper clamping assemblies 72 includes anupper cylinder 80 and anupper grip 82 secured to theupper cylinder 80 via anupper cylinder rod 84. Each of thelower clamping assemblies 74 includes alower cylinder 86 and alower grip 88 secured to thelower cylinder 86 via alower cylinder rod 90. The upper andlower cylinders lower grips lower cylinders mine roof bolt 26 to securely hold themine roof bolt 26 while being processed. - Referring to
Figs. 8-11 , each of thedie holder assemblies 70 includes abody 92, aninsert holder 94 and insert 96 received within thebody 92, and acover plate 98. Thebody 92 defines aninternal passageway 100 having afirst end 102 for receiving an end of thedie cylinder rod 78 and asecond end 104 for receiving theinsert holder 94 andinsert 96. Each of thedie holder assemblies 70 further includes a pair ofside rollers 106 and anupper roller 108. The pair ofside rollers 106 is received by respective spaced apartlower tracks 110 positioned on thedie support plates 76. Theupper roller 108 of each dieholder assembly 70 is received by a respectiveupper track 112 positioned on atrack support plate 114 that extends perpendicularly to theframe plates 52. The pair ofside rollers 106 and theupper roller 108 allows each dieholder assembly 70 to be supported and to be freely moveable between a retracted and extended position while extruding or processing themine roof bolt 26. - Referring again to
Figs. 1-11 , when thebar 20 ormine roof bolt 26 reaches theextruder assembly 40 and is in a proper position, the upper andlower clamping assemblies bar 20 securely during the extrusion process. Thelower cylinder 86 is actuated to extend thelower cylinder rod 90 to full stroke to maintain constant a constant vertical or centerline of thebar 20 being extruded. Theupper cylinder 80 provides a clamping force which is regulated via a pressure reduction to theupper cylinder 80. Once clamping is completed, thedie cylinder 68 is actuated to move one of thedie holder assemblies 70 towards thebar 20. Theinsert 96 of thedie holder assembly 70 engages thebar 20 and completes a first step of the extrusion process. Thedie cylinder 68 will then retract and the upper andlower clamping cylinders lower grips bar 20 is then moved to the next extruder dieassembly extruder assembly 40 includes three extruder dieassemblies bar 20. Theextruder assembly 40, however, may include one or more extruder die assemblies. After finishing the extrusion process, thebars 20 ormine roof bolts 26 are moved to the discharge position and deposited into thecradle 18 for collection and/or further processing. - Referring to
Figs. 12-14 , a further embodiment of theprocessing station 16 includes aheader assembly 120. Theheader assembly 120 is configured to form thehead 28, as described above, on thebar 20 ormine roof bolt 26. Theheader assembly 120 is embodied as a forging mechanism, although other suitable arrangements may be provided to form thehead 28. As discussed above, themine roof bolt 26 is heated by theheating source 14 shown inFig. 1 before reaching theheader assembly 120. Theheader assembly 120 may be similar to theextruder assembly 40 discussed above and shownFigs. 3-11 . Although not shown, theheader assembly 120 would also include thedie cylinder 68 and upper andlower clamping assemblies header assembly 120 also includesframe plates 122 that are different from theframe plates 52 of theextruder assembly 40, although theheader assembly 120 may also utilize the same components of theextruder assembly 40 with different tooling being utilized. In particular, theframe plates 122 of theheader assembly 120 are each formed with separate upper andlower portions adjacent frame plates 122. Further, theframe plates 122 define asingle opening 128 and are each configured to receivebars 20 ormine roof bolts 26 for the forging process. As shown more clearly inFig. 14 , theheader assembly 120 includes first andsecond cone assemblies insert assembly 134 rather than the extruder dieassemblies extruder assembly 40. Eachcone assembly body 136 that receives acone tool 138. Although shown in front of thecone tool 138, atool spacer 140 andwasher 142 are positioned behind thecone tool 138 with acover plate 144 secured to thebody 136 to fix thecone tool 138 within thebody 136. Eachcone assembly assemblies extruder assembly 40. - Referring again to
Figs. 12-14 , theinsert assembly 134 includes abody 146 that receives an insert backplate 148, aninsert holder 150, and aninsert 152. Theinsert 152 is configured to form the final dimensions of the square-shapedprotrusion 36 of thehead 28 shown inFigs. 2A and 2B , althoughother inserts 152 may be utilized to form a variety of head shapes and sizes. Thebody 146 further receives astencil holder 154, a stencil backplate 156, and astencil 158. Thestencil 158 is configured to provide product identification or other information on thehead 28 of themine roof bolt 26. A pair ofclamps 160 is used to secure theinsert 152,stencil 158, and other components within thebody 146 of theinsert assembly 134. Thebars 20 ormine roof bolts 26 may be fed through theheader assembly 120 in the same manner as discussed above in connection with theextruder assembly 40. Thehead 28 of themine roof bolt 26 may be formed by first and second forging processes performed by the first andsecond cone assemblies bar 20 and a third forging process performed by theinsert assembly 134 to provide the final shape and dimension of thehead 28 shown inFigs. 2A and 2B . Theheader assembly 120, however, may include one or more forging processes to provide the final head shape and size. - Referring to
Figs. 15-18 , another embodiment of theprocessing station 16 includes a threadingassembly 162. The threadingassembly 162 is configured to thread a portion of themine roof bolt 26, such as an end of themine roof bolt 26. The threadingmachine 162 generally includes aframe assembly 164, a movingdie assembly 166, and astationary die assembly 168. Theframe assembly 164 includes threeframe plates 170 secured to abase plate 172, aback plate 174, and afront plate 176. Thefront plate 176 defines anopening 178 that is configured to receive a portion of themine roof bolt 26. Theframe assembly 164 also includesremovable gusset plates 180 and agusset base plate 182. The movingdie assembly 166 is movable relative to theframe assembly 164 and thestationary die assembly 168 via adie cylinder 184. Thedie cylinder 184 may be a hydraulic cylinder, although other suitable arrangements for moving the movingdie assembly 166 may be utilized. The movingdie assembly 166 includes a movingdie block 186 and a movingdie 188 that is received by the movingdie block 186. The movingdie block 186 and moving die 188 are moved vertically between a retracted position and an extended position along a track formed by aframe track 190 secured to theback plate 174 and adie track 192 secured to the movingdie block 186. Thestationary die assembly 168 is fixed relative to theframe assembly 164 and includes astationary die block 194 and astationary die 196 received by thestationary die block 194. - Referring again to
Figs. 15-18 , the threadingassembly 162 also includes asupport stand 198 having first andsecond paddles mine roof bolt 26 for positioning themine roof bolt 26 between the moving and stationary dies 188, 196. The first andsecond paddles second paddles paddles assembly 162 includes apusher member 206 that is moveable between a retracted and extended position by apusher cylinder 208. Thepusher member 206 is moved to the extended position and is configured to engage amine roof bolt 26 positioned on the first andsecond paddles pusher member 206 further causes thepaddles mine roof bolt 26 is positioned between the moving and stationary dies 188, 196 once the threading operation is commenced. The threadingassembly 162 is configured to receive themine roof bolt 26 between thestationary die 196 and the moving die 188 and moving the moving die 188 to roll themine roof bolt 26 and form threads on a portion of themine roof bolt 26. The end of themine roof bolt 26 to be threaded may be fed through theopening 178 in thefront plate 176 and supported by thepaddles support stand 198. - Referring still to
Figs. 15-18 , themine roof bolt 26 is rolled between the moving die 188 and thestationary die 196 to form threads on a portion of themine roof bolt 26 and is deposited onto thebase plate 172 at the bottom of the threadingassembly 162. Thegusset plates 180 are configured to support the threadingassembly 162 as a stand alone unit. However, thegusset plates 180 may be removed and the threadingassembly 162 can be secured attached to one of theother processing stations front plate 176 of the threadingassembly 162 can be secured attached to one of theframe plates 52 of theextruder assembly 40 to provide continuous throughput of themine roof bolts 26. After being threaded, themine roof bolts 26 may be carried by a conveyor arrangement (not shown) from the threading machine to a packaging area or further processing area. - Referring to
Figs. 19 and 20 , the feed andindexing assembly 212 includes afeed rack 214, afeed wheel 216, adrive member 218, drivesprockets 220, and indexing clamps 222. Thefeed rack 214 is configured to provide a continuous feed ofbars 20 to thefeed wheel 216. Thefeed wheel 216 is generally disc-shaped and includes a plurality of notches 224 that are configured to receive thebars 20. Thefeed wheel 216 continuously rotates and receivesbars 20 in the notches 224, which are fed from thefeed rack 214. Thefeed wheel 216 feeds thebars 20 to theconveyor 12 shown inFig. 1 . Theconveyor 12 is embodied as thedrive member 218 mounted on thedrive sprockets 220. Thedrive member 218 may be a drive chain, although other suitable arrangements may be utilized for thedrive member 218. A plurality ofdrive members 218 and a plurality ofdrive sprockets 220 may be utilized to support thebars 20 ormine roof bolts 26 at each end. Thedrive sprockets 220 are driven and rotated to move thebars 20 ormine roof bolts 26 along theconveyer 12 and through thevarious processing stations 16. Thedrive sprockets 220 may be driven via an electric motor, although other suitable arrangements may be utilized to drive thedrive sprockets 220. Thedrive member 218 may include a plurality of sets of indexing clamps 222 that receive thebars 20 from thefeed wheel 216 and position the bars 20 a predetermined lateral distance apart from each other. The indexing clamps 222 are secured to thedrive member 218 and are configured to be spaced apart as they rotate about thedrive sprockets 220. In particular, as shown inFig. 19 , the indexing clamps 222 separate as they rotate around thedrive sprocket 220 and receive thebar 20 from thefeed wheel 216. As the indexing clamps 222 move beyond thedrive sprocket 220, the indexing clamps 222 are moved back together to receive and index thebars 20. - Referring to
Fig. 20 , the feed andindexing assembly 212 further includes anindex cylinder 226 and astop plate 228 that are configured to index the longitudinal position of thebars 20 ormine roof bolts 26. Theindex cylinder 226 includes anengagement 230 that is moveable between first and second positions and is configured to engage thebars 20 and move them in a longitudinal direction. In particular, thebars 20 are engaged by theengagement 230 of theindex cylinder 226 until thebars 20 abut thestop plate 228 to ensure that thebars 20 have a proper longitudinal orientation before entering theprocessing stations 16. - Although the invention has been described in detail for the purpose of illustration based on what is currently considered to be the most practical and preferred embodiments, it is to be understood that such detail is solely for that purpose and that the invention is not limited to the disclosed embodiments but, on the contrary, is intended to cover modifications and equivalent arrangements that are within the scope of the appended claims.
Claims (13)
- A system (10) for producing a mine roof bolt comprising:a feed arrangement configured to continuously deliver bars to a conveyor (12);said conveyor (12) configured to index and transport said bars;a processing station (16) comprising at least one of a header assembly (120), an extruding assembly (40), and a threading assembly (162),wherein the processing station (16) is positioned along the conveyor (12) and configured to receive and process a portion of the bars to form a mine roof bolt, characterized in that the feed arrangement comprises a feed rack (214) and a feed wheel (216) positioned adjacent to the feed rack (214), the feed wheel (216) configured to receive bars from the feed rack (214) and to deliver the bars to the conveyor (12), that the conveyor (12) further comprises at least two drive sprockets (220), and a drive member (218) forming a continuous loop and extending circumferentially around the at least two drive sprockets (220) and that the drive member (218) includes a plurality of indexing clamps (222), the plurality of indexing clamps (222) being configured to receive the bars and index a lateral position of the bars relative to adjacent bars.
- The system (10) of claim 1, further comprising a heating source (14) configured to heat a portion of the bar, wherein the processing station (16) comprises a header assembly (120), the header assembly (120) comprising:
a frame assembly (42, 164), upper and lower clamp assemblies, and at least one header die assembly, the upper and lower clamp assemblies configured to engage a portion of the bar, the at least one header die assembly comprising a die cylinder (68, 184), a die holder, and a tool received by the die holder, the die holder moveable between a retracted and extended position via the die cylinder (68,184), wherein the header assembly (120) is configured to form a head (28) at an end of the bar. - The system (10) of claim 1, wherein the processing station (16) comprises an extruder assembly (40), the extruder assembly (40) comprising:
a frame assembly (42, 164), upper and lower clamp assemblies, and at least one extruder die assembly, the upper and lower clamp assemblies configured to engage a portion of the bar, the at least one extruder die assembly comprising a die cylinder (68, 184), a die holder, and a tool received by the die holder, the die holder moveable between a retracted and extended position via the die cylinder (68, 184), wherein the extruder assembly (40) is configured to extrude a portion of the bar. - The system (10) of claim 3, wherein the processing station (16) further comprises a threading assembly (162), the threading assembly (162) comprising:
a frame assembly (42,164), a moving die assembly (166), and a stationary die assembly (168), the moving die assembly (166) is movable relative to the frame assembly (42,164) and the stationary die assembly (168) via a threading die cylinder, the moving die assembly (166) and the stationary die assembly (168) are configured to form threads on a portion of the rod. - The system (10) of claim 4, wherein the threading assembly (162) further comprises a support stand (198) having first and second paddles (202, 204), the first and second paddles (202, 204) are each configured to initially support the rod prior to forming threads on a portion of the rod, the first and second paddles (202, 204) are movable in a downward direction.
- The system (10) of claim 1, further comprising an index cylinder (226) and a stop plate (228) that are configured to index the longitudinal position of a bar positioned on the conveyor (12), the index cylinder (226) moveable between first and second positions and configured to move a bar until the bar contacts the stop plate (228).
- The system (10) of claim 1, further comprising a receptacle positioned adjacent to an end of the conveyor (12), the plurality of indexing clamps (222) is configured to release the bars and deposit the bars into the receptacle.
- A method of producing a mine roof bolt utilizing the system (10) of any of claims 1 to 7, the method comprising:providing a plurality of bars of a predetermined length;moving the plurality of bars along the conveyor (12) and indexing the position of the plurality of bars;passing a portion of each of the plurality of bars through the processing station (16);
andprocessing a portion of each of the plurality of bars with the processing station (16). - The method of claim 8, wherein a longitudinal and lateral position of the plurality of bars is indexed.
- The method of claim 9, wherein the processing station (16) comprises a header assembly (120), and wherein processing the portion of each of the plurality of bars comprises:heating a portion of a first bar of the plurality of bars;passing the portion of the first bar through the header assembly (120); andforging a head (28) at an end of the first bar.
- The method of claim 9, wherein the processing station (16) comprises an extruder assembly (40), and wherein processing the portion of each of the plurality of bars comprises:passing a portion of a first bar of the plurality of bars through the extruder assembly (40);actuating a die cylinder (68, 184) to move a die holder assembly (70) toward the first bar; andextruding a portion of the first bar.
- The method of claim 11, further comprising:after extruding the portion of the first bar, moving the first bar along the conveyor (12) toward a second extruder assembly (40);passing the portion of the first bar of the plurality of bars through the second extruder assembly (40);actuating a die cylinder (68, 184) to move a die holder assembly (70) toward the first bar; andfurther extruding the portion of the first bar.
- The method of claim 8, wherein providing the plurality of bars comprises:
moving each of the plurality of bars from a feed rack (214) to the conveyor (12) using a feed delivery device.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL14778774T PL2969302T3 (en) | 2013-03-11 | 2014-03-10 | System and method of producing mine roof bolts |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US201361776010P | 2013-03-11 | 2013-03-11 | |
PCT/US2014/022349 WO2014164407A1 (en) | 2013-03-11 | 2014-03-10 | System and method of producing mine roof bolts |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2969302A1 EP2969302A1 (en) | 2016-01-20 |
EP2969302A4 EP2969302A4 (en) | 2016-11-30 |
EP2969302B1 true EP2969302B1 (en) | 2020-10-28 |
Family
ID=51658867
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14778774.1A Active EP2969302B1 (en) | 2013-03-11 | 2014-03-10 | System and method of producing mine roof bolts |
Country Status (6)
Country | Link |
---|---|
US (1) | US20140315649A1 (en) |
EP (1) | EP2969302B1 (en) |
CA (1) | CA2901372C (en) |
ES (1) | ES2837047T3 (en) |
PL (1) | PL2969302T3 (en) |
WO (1) | WO2014164407A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN111570715A (en) * | 2020-05-25 | 2020-08-25 | 绍兴集知汇信息科技有限公司 | Bolt intelligence shaping system of processing |
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US1768866A (en) * | 1928-02-20 | 1930-07-01 | David L Summey | Metal-extruding apparatus |
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US3183533A (en) * | 1960-06-01 | 1965-05-18 | Ajax Mfg Co | Stock feed mechanism for forging machines |
FR1297441A (en) * | 1961-06-29 | 1962-06-29 | Mueller Fritz Pressenfab | Device for transporting parts in a press |
NL6612263A (en) * | 1966-05-31 | 1967-12-01 | ||
US3719069A (en) * | 1969-08-16 | 1973-03-06 | R Liebergeld | Apparatus for conveying an elongated workpiece |
JPS60240333A (en) * | 1984-05-14 | 1985-11-29 | Yoshida Kogyo Kk <Ykk> | Production of billet for extruded shape |
EP0272067A3 (en) * | 1986-12-18 | 1990-05-09 | Stelco Inc. | Process and apparatus for upset forging of long stands of metal bar stock |
FR2621273B1 (en) * | 1987-10-05 | 1994-10-07 | Clecim Sa | PROCESS AND PLANT FOR THE PREPARATION OF METAL BEADS TO BE SPINNING |
JPH01171427A (en) * | 1987-12-25 | 1989-07-06 | Kawakami Tekkosho:Kk | Automatic sending device for noodle hanging bar |
US5201401A (en) * | 1989-10-31 | 1993-04-13 | Sms Hasenclever Gmbh | Discharge conveying apparatus for an extrusion press |
EP0672473A1 (en) * | 1994-03-15 | 1995-09-20 | Norsk Hydro A/S | Apparatus and process for the extrusion of profiles |
EP0759331B1 (en) * | 1995-08-12 | 1997-04-09 | SMS HASENCLEVER GmbH | Transverse step-by-step transport apparatus of profiles between an extrusion press and a stretcher leveller |
JPH09278168A (en) * | 1996-04-17 | 1997-10-28 | Win Tec Kk | Separately feeding method for accumulated bar like articles |
KR100303490B1 (en) * | 1999-08-23 | 2001-09-24 | 임주영 | Device for automafically molding a long bolt |
JP2003211252A (en) * | 2002-01-22 | 2003-07-29 | Minebea Co Ltd | Forging device |
KR101065357B1 (en) * | 2010-12-02 | 2011-09-16 | 한국기계연구원 | A forging device for titanium alloy bolt and a manufacturing method of forging for titanium alloy bolt and titanium alloy bolt using it |
-
2014
- 2014-03-10 WO PCT/US2014/022349 patent/WO2014164407A1/en active Application Filing
- 2014-03-10 US US14/202,081 patent/US20140315649A1/en not_active Abandoned
- 2014-03-10 PL PL14778774T patent/PL2969302T3/en unknown
- 2014-03-10 ES ES14778774T patent/ES2837047T3/en active Active
- 2014-03-10 CA CA2901372A patent/CA2901372C/en active Active
- 2014-03-10 EP EP14778774.1A patent/EP2969302B1/en active Active
Non-Patent Citations (1)
Title |
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None * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN111570715A (en) * | 2020-05-25 | 2020-08-25 | 绍兴集知汇信息科技有限公司 | Bolt intelligence shaping system of processing |
Also Published As
Publication number | Publication date |
---|---|
US20140315649A1 (en) | 2014-10-23 |
EP2969302A1 (en) | 2016-01-20 |
EP2969302A4 (en) | 2016-11-30 |
CA2901372C (en) | 2022-09-13 |
PL2969302T3 (en) | 2021-07-05 |
ES2837047T3 (en) | 2021-06-29 |
WO2014164407A1 (en) | 2014-10-09 |
CA2901372A1 (en) | 2014-10-09 |
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