WO2016019193A2 - Liaison de coupe de chaîne de mine et système de retenue de broche de mine - Google Patents

Liaison de coupe de chaîne de mine et système de retenue de broche de mine Download PDF

Info

Publication number
WO2016019193A2
WO2016019193A2 PCT/US2015/043006 US2015043006W WO2016019193A2 WO 2016019193 A2 WO2016019193 A2 WO 2016019193A2 US 2015043006 W US2015043006 W US 2015043006W WO 2016019193 A2 WO2016019193 A2 WO 2016019193A2
Authority
WO
WIPO (PCT)
Prior art keywords
pin
drive pin
link
mining
retainer
Prior art date
Application number
PCT/US2015/043006
Other languages
English (en)
Other versions
WO2016019193A3 (fr
Inventor
Clayton A. Crystal
Original Assignee
Itr America Llc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Itr America Llc filed Critical Itr America Llc
Publication of WO2016019193A2 publication Critical patent/WO2016019193A2/fr
Publication of WO2016019193A3 publication Critical patent/WO2016019193A3/fr

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C25/00—Cutting machines, i.e. for making slits approximately parallel or perpendicular to the seam
    • E21C25/22—Machines slitting solely by one or more cutter chains moving unidirectionally along jibs
    • E21C25/28—Chains or chain guides
    • E21C25/34—Chains
    • E21C25/36—Couplings for links
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00—Joints and connections
    • Y10T403/32—Articulated members
    • Y10T403/32606—Pivoted
    • Y10T403/32861—T-pivot, e.g., wrist pin, etc.
    • Y10T403/32893—T-pivot, e.g., wrist pin, etc. including distinct pin retainer

Definitions

  • the present invention relates to an apparatus for performing cutting operations by a mining machine and the method of making the apparatus.
  • Cutting chains are frequently found in mining operations, including in continuous longwall miners. These chains have tool bits mounted to them that act as picks to repeatedly break apart the surface being mined as the chain is driven around a sprocket.
  • These cutting links were constructed by welding a tool mounting hub 20 to a regular roller link of the chain.
  • a shank access gap between the link body and a tool mounting hub 20 was formed by milling away or broaching a portion of the link body. Once the shank 26 of the tool bit 25 was placed in the tool mounting hub 20, the shank access gap provided access for a C- ring retainer 29 to be placed around a recess in shank 26 thus securing tool bit 25 within the tool mounting hub 20.
  • FIG. 3 Another prior art cutting link is depicted in FIG. 3.
  • the link contains shank access gap formed by a milled slot 106 wherein a C- ring retainer can be secured to the shaft of the tool bit.
  • the milling potentially weakens the link and is an extra step during the manufacture of the link that adds to costs.
  • Another frequent area for failure of the mining chain occurs in the connection between links.
  • the links of a mining chain are connected together by drive pins.
  • the retention system for the drive pin uses dowel pins that can shear or break from lateral force or contact with the mining material. When this occurs, the chain breaks and the miner fails.
  • the disclosed link also employs the use of a rubber sandwich pin or steel spring pin with a drive pin retainer that covers the rubber or steel pin to provide a superior retention system for the pin in the retainer thereby doing a better job of retaining the retainer on the drive pin.
  • FIG. 9a and 9b depict a diagram of a drive pin and retainer used with a perpendicular rubber sandwich pin.
  • FIG. 10 depicts a rubber sandwich pin to be used with the drive pin of
  • FIG. 11 depicts a drive pin and retainer secured with a rubber sandwich pin oriented in line with the drive pin.
  • FIG. 12a-c depicts a D-shaped drive pin and retainer secured with a steel spring pin.
  • FIG 13 depicts a threaded drive pin with retainer secured with a rubber sandwich pin oriented in line with the drive pin.
  • FIG. 14 depicts a perspective view of a pivot pin.
  • FIG. 15 depicts a perspective view of the presently disclosed chain pin.
  • FIG. 16 depicts a perspective view of another embodiment of the presently disclosed mining pin.
  • FIG. 17 depicts a perspective view of the presently disclosed mining pin retainer.
  • FIG. 18a-d depicts a perspective view of the one embodiment disclosed mining pin with retainer.
  • the presently disclosed cutting link 400 is integrally cast as a single link and tool mounting hub 420. It does not require additional welding or milling. This link does not suffer the problems faced by the prior art cutting links because there are no welded joints.
  • the current invention includes a shank access gap 430 that allows tools bits to be secured through the use of a C-ring which can be removed when the tool bit needs to be replaced. Although depicted as located in the side, it should be appreciated that the shank access gap can also be located along the top of the cutting link 400.
  • the cutting link 400 has a structure that reduces the likelihood of fracturing under stressful conditions.
  • the curved surface provides additional strength, especially along the convex surfaces of the tool mounting hub 420.
  • the unique shape of the cutting link 400 further allows for additional steel to be added at select locations to improve the strength of the link. Additionally, the bores of the cutting link 400 may be induction hardened to improve the life of the device without making it brittle.
  • the cutting link 400 is designed to resemble other roller links found in the mining chain. It is comprised of a link body 401 that has a two transverse bores 410 at the longitudinal ends of the link body 401, wherein each of the transverse bores 410 can accept a drive pin 840 (also called a pivot pin) to pivotally connect the cutting links 400 to other roller links in the mining chain.
  • the leading transverse bore 410 is on the side of the cutting link 400 that approaches the surface being mined first when in normal use, with the trailing transverse bore 412 residing on the trailing side of the cutting link 400 and last to approach the mining surface.
  • the roller links may be carburized as to harden the metal.
  • An outwardly projecting tool mounting hub 420 extends from the link body 401 and has within it an open bore 422 through its length that is sized to snugly receive the shank 26 of a tool bit 25 (as pictured in FIG. 2).
  • the axis of the open bore 422 is angled relative to the length of the link body 401 such that when the shank 26 of the tool bit 25 is placed within the tool mounting hub 420, the mining tip 27 of the tool bit 26 rises up and toward the leading edge of the cutting link (as viewed with the transverse bores level to the ground, and the leading transverse bore 411 closest to the mining surface).
  • the tool mounting hub 420 may be angled to the left or right if it is a clearance bit intended to cut the kerf.
  • the cutting tool bits depicted in FIGs. 4-7 are angled at 24 degrees to the left of center. In a typical configuration, tool bits that are angled 24 degrees to the right would also be used, along with a tool bit angled 12 degrees to the right, a tool bit angled 12 degrees to the left, and a tool bit that is centered.
  • the upper surface of the tool mounting hub 420 is connected to the trailing end of the link body 401 by a curved convex surface.
  • This rigid section of metal provides additional support and structure to the cutting link 400 so that impact forces on the tool bit 25 during mining are distributed throughout the whole cutting link 400, thus reducing stress on the tool mounting hub 420.
  • the shank access gap 430 is a space in the side of the cutting link through which the shank of the tool bit can be accessed.
  • the shank access gap 430 is accessible from one side of the cutting link, and is contiguous with the open bore 422.
  • the shank access gap 430 allows the shank 26 of the tool bit 25 to be accessed so that a C-ring retainer 29 can be placed on shank 26, thus securing the tool bit 25 within the tool mounting hub 420.
  • the C-ring retainer can easily be removed from the shank 26 through the shank access gap 430.
  • the cutting link 400 is made by casting it as one single piece and does not have any welds holding it together. As a result, it is a much stronger link. Where required, the cast can be constructed to add additional steel in areas that require greater strength, creating a cutting link that is as strong as any other link in the chain.
  • integral casting is much cheaper to make than forging and welding a link.
  • an integral link having a tool mounting hub could be forged, it would require extensive drilling and machining to create the tool mounting hub and broaching to create the shank access gap.
  • the drive pin 840 is a generally cylindrically-shaped pin that passes through the transverse bores 410 of the mining chain links. It has a pin head 842 on one end and a fastener end 844 at the opposite end.
  • the drive pin 840 was held in place by a retainer 850 that surrounds the fastener end 844 of the drive pin 840.
  • a dowel pin was driven through a hole in retainer 850, and through drive pin hole 848 in the side of the drive pin 840.
  • the dowel pin protruded through the retainer 850, and could easily shear or break from the lateral force or contact with the mining material. When this occurs, the mining chain would break, and the miner fails.
  • Some prior art roller links had protective rings surrounding the retainer that was intended to contain the dowel pin in its location. However, this protective ring could break off, and because there is no positive retention holding the dowel pin in, it could slide out.
  • the pivot pin has a retainer 850 held on by pins that are substantially flush with the retainer.
  • a rubber sandwich pin 860 is used.
  • the rubber sandwich pin 860 is constructed of two pieces of elongated metal pieces 864 with a rubber center 862 between them.
  • the rubber center 862 is typically injected into the mold between the elongated metal pieces 864, causing it to adhere to the two elongated metal pieces 864.
  • the elongated metal pieces 864 are angled inwards toward the ends, with a middle section that is narrower.
  • a steel spring pin 870 is used.
  • the steel spring 870 has three prongs and a handle 872.
  • the outer prongs 874 extend outward as they pass into the interior of the drive pin hole 848. Because of the spring force of the outer prongs 874 against the retainer 850, the steel spring does not easily come out from the drive pin hole 848. Once again, this positive retention keeps the steel spring pin from sliding out of the drive pin hole.
  • this rubber sandwich pin 860 or steel spring pin 870 does not substantially protrude past the retainer, there is a significantly reduced chance that either pin will become damaged resulting in the retainer 850 separating from the drive pin 840.
  • FIGs. 14 to 18 Other potential retainers and dowel pins are shown in FIGs. 14 to 18.
  • a Hendrix pin or threaded steel pin with a castle nut is used.
  • the castle nut can be held in place using a cotter pin. This is an excellent solution for repairs.
  • the presently disclosed drive pin retention system can be used with any shaped retainer 850 that fits over the fastener end 844 of the drive pin 840.
  • a D-shaped retainer is used in applications where the drive pin has at least one flat surface cut into the curved sidewall of the drive pin.
  • the drive pin 840 can be threaded such that the retainer 850 screws into place. Once the holes in the retainer and the drive pin hole 848 are aligned, a rubber sandwich pin or steel spring pin can be placed into the hole.
  • FIG. 18a shows another embodiment of a drive pin retention system.
  • the retainer 850 is placed over the fastener end 844 of the drive pin 840 (as numbered similarly to FIG. 13).
  • the retainer 850 has two holes that pass all the way through the sidewalls of the retainer along the diameter of the retainer.
  • the drive pin similarly has a drive pin hole 848 that passes through the drive pin 840.
  • FIG. 18d depicts a dowel pin 880 having two notched sections in the surface of the dowel pin such that the diameter at the notched sections is smaller than the diameter of the rest of the dowel pin 880.
  • the dowel pin 880 is intended to pass through the retainer 850 and the drive pin 840.
  • FIG. 18b depicts a retainer ring 882 having an interior diameter slightly larger than the diameter of the notched section, but smaller than the diameter at the unnotched section.
  • the retainer ring 882 is able to open up slightly under pressure to accommodate the wider sections of the dowel pin 880. This is accomplished by having the retainer ring 882 be C-shaped so that it can be forced to open wider. Alternatively, the retainer ring 882 can be made of a flexible material that allows it to open wider.
  • FIG. 18c depicts a plastic seal 884 that is used to hold the retainer ring 882 in place in the holes of the drive pin 840. The plastic seal 884 also helps prevent the steel pieces from weakening as they rub against each other.
  • a plastic seal 884 and retainer ring 882 are used on each side of the drive pin 840 to keep the dowel pin 880 in place.
  • the notched dowel pin 880 is held in place by two retainer rings 882 located in the holes of the drive pin 840.
  • Each of the two retainer rings 882 acts individually as a lock to keep the dowel pin 880 in place.
  • the double locking mechanism ensures that the dowel pin 880 stays in place, even if one retainer ring 882 fails.
  • the retainer 850 is placed over the end of the drive pin 840 such that the holes of the retainer 850 line up with the holes of the drive pin 840.
  • the dowel pin 880 is then hammered through the first hole of the retainer 850 and to the first hole of drive pin 840 which has a retainer ring 882 against its opening, held in place by the plastic seal 884.
  • the hammering of the dowel pin 880 causes the retainer ring 882 to open up as the dowel pin 880 is squeezed through.
  • the dowel pin 880 will then pass through the second retainer ring 882 causing it to open up.
  • each retaining ring 882 will be wrapped tightly in a closed position around the notches of the dowel pin 880.
  • the cutting link 400 and the pin retention mechanism does not require a whole new mining chain, but instead can be employed by replacing specific links or the retainer cap.
  • the invention has been described for use with mining, it can be used in other applications, such as trencher chains.
  • the pin retention system can also be used in any chain application.

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)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Earth Drilling (AREA)

Abstract

La présente invention concerne une liaison de coupe améliorée et un système de retenue de broche d'entraînement pour des chaînes de mine. La liaison de coupe est coulée d'une seule pièce au lieu d'être réalisée à partir de multiples parties soudées ensemble. Le système de retenue de broche d'entraînement diminue en outre la possibilité que la chaîne puisse se briser en raison de goupilles cylindriques cisaillées.
PCT/US2015/043006 2014-07-30 2015-07-30 Liaison de coupe de chaîne de mine et système de retenue de broche de mine WO2016019193A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201462030893P 2014-07-30 2014-07-30
US62/030,893 2014-07-30

Publications (2)

Publication Number Publication Date
WO2016019193A2 true WO2016019193A2 (fr) 2016-02-04
WO2016019193A3 WO2016019193A3 (fr) 2016-04-14

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Application Number Title Priority Date Filing Date
PCT/US2015/043006 WO2016019193A2 (fr) 2014-07-30 2015-07-30 Liaison de coupe de chaîne de mine et système de retenue de broche de mine

Country Status (2)

Country Link
US (1) US20160032722A1 (fr)
WO (1) WO2016019193A2 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016051344A1 (fr) * 2014-09-29 2016-04-07 King Abdullah University Of Science And Technology Système d'agriculture à base de laser
WO2016201117A2 (fr) * 2015-06-09 2016-12-15 Itr America, Llc Système de retenue de goupilles utilisées en exploitation minière
US11846187B2 (en) 2017-08-30 2023-12-19 Itr America, Llc Mining pin retention system

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Also Published As

Publication number Publication date
WO2016019193A3 (fr) 2016-04-14
US20160032722A1 (en) 2016-02-04

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