EP3128126A1 - Schneidtrommel mit schwenkbarer schneideinheit - Google Patents

Schneidtrommel mit schwenkbarer schneideinheit Download PDF

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Publication number
EP3128126A1
EP3128126A1 EP15180016.6A EP15180016A EP3128126A1 EP 3128126 A1 EP3128126 A1 EP 3128126A1 EP 15180016 A EP15180016 A EP 15180016A EP 3128126 A1 EP3128126 A1 EP 3128126A1
Authority
EP
European Patent Office
Prior art keywords
cutting
cutting drum
support arm
face
longitudinal axis
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP15180016.6A
Other languages
English (en)
French (fr)
Inventor
Joachim Raschka
Jens Steinberg
Ulrich Bechem
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Caterpillar Global Mining Europe GmbH
Original Assignee
Caterpillar Global Mining Europe GmbH
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 Caterpillar Global Mining Europe GmbH filed Critical Caterpillar Global Mining Europe GmbH
Priority to EP15180016.6A priority Critical patent/EP3128126A1/de
Priority to PCT/EP2016/001356 priority patent/WO2017021007A1/en
Publication of EP3128126A1 publication Critical patent/EP3128126A1/de
Withdrawn legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/18—Dredgers; Soil-shifting machines mechanically-driven with digging wheels turning round an axis, e.g. bucket-type wheels
    • E02F3/22—Component parts
    • E02F3/24—Digging wheels; Digging elements of wheels; Drives for wheels
    • E02F3/245—Digging wheels; Digging elements of wheels; Drives for wheels with digging elements mounted movable relative to the wheel
    • 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
    • E21C25/06—Machines slitting solely by one or more cutting rods or cutting drums which rotate, move through the seam, and may or may not reciprocate
    • E21C25/10—Rods; Drums
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C27/00—Machines which completely free the mineral from the seam
    • E21C27/20—Mineral freed by means not involving slitting
    • E21C27/24—Mineral freed by means not involving slitting by milling means acting on the full working face, i.e. the rotary axis of the tool carrier being substantially parallel to the working face
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/18—Dredgers; Soil-shifting machines mechanically-driven with digging wheels turning round an axis, e.g. bucket-type wheels
    • E02F3/20—Dredgers; Soil-shifting machines mechanically-driven with digging wheels turning round an axis, e.g. bucket-type wheels with tools that only loosen the material, i.e. mill-type wheels
    • E02F3/205—Dredgers; Soil-shifting machines mechanically-driven with digging wheels turning round an axis, e.g. bucket-type wheels with tools that only loosen the material, i.e. mill-type wheels with a pair of digging wheels, e.g. slotting machines

Definitions

  • the present disclosure relates to continuous mining. More particularly, the present disclosure relates to a cutting drum for a mobile mining machine, a related cutting drum assembly for a mobile mining machine, and a related mobile mining machine, particularly a continuous mining machine.
  • continuous mining machines are used to extract material from a mine face.
  • continuous mining machines include a machine frame with a ground engaging device such as track chains for moving the continuous mining machine.
  • a cutting drum assembly including a plurality of cutting drums is pivotably connected to the main frame by a boom assembly.
  • the boom assembly and the cutting drum assembly are pivoted up and down against the mine face for extracting material therefrom.
  • Extracted material is loaded onto a loading table positioned generally below the boom assembly and the cutting drum assembly.
  • the material loaded onto the loading table is gathered and directed to a conveyor of the continuous mining machine that transports the material away from the mine face to a desired dropping zone.
  • the cutting drums of the cutting drum assembly for example two outer cutting drums encompassing a central cutting drum, are provided with a clearance between one another.
  • the clearance is required for connecting the cutting drums to the boom arms of the boom assembly.
  • material remains uncut in a region of the interspaces.
  • elongate material cores form that vertically extend along the mine face.
  • the elongate material cores at the mine face have to be removed to allow forward travel of the continuous mining machine.
  • the boom assembly may be pivotable in the vertical direction only, the continuous mining machine may have to move back for shifting the continuous mining machine sideways, to subsequently advance in direction to the mine face for removing the elongate material cores with the cutting drums.
  • that approach is laborious and time consuming.
  • a technology for removing the elongate material cores is to provide core breakers in the interspaces between the cutting drums, which break the elongate material cores as the continuous mining machine advances in direction to the mine face.
  • US 2,808,253 (A ) discloses a cutting drum assembly with core breakers.
  • the present disclosure is directed, at least in part, to improving or overcoming one or more aspects of prior systems.
  • a cutting drum for a mobile mining machine may comprise an outer circumferential face extending between a first end face and a second end face about a central longitudinal axis.
  • the cutting drum may further comprise a plurality of cutting tools mounted to and distributed over the outer circumferential face, and at least one first support arm including a cutting tool and being pivotably mounted to the outer circumferential face.
  • the first support arm may be pivotable into a working position, in which the cutting tool of the first support arm may be positioned beyond the first end face in a direction of the central longitudinal axis and away from the second end face.
  • a cutting drum assembly for a mobile mining machine.
  • the cutting drum assembly may comprise a plurality of cutting drums connected side by side. At least one of the plurality of cutting drums may be configured as exemplary disclosed herein, with the cutting tool of the at least one first support arm being pivotable into the working position, which may be positioned between the neighboring cutting drums in the direction of the central longitudinal axis.
  • a mobile mining machine may be a continuous mining machine.
  • the mobile mining machine may comprise a cutting drum as exemplary disclosed herein or a cutting drum assembly as exemplary disclosed herein.
  • the present disclosure is based in part on the realization that although core breakers allow breaking the elongate material cores at the mine face as the continuous mining machine advances, material cores at the roof and at the floor having a rectangular cross-section remain uncut. The reason is that cutting bits of the cutting drums extend beyond the core breakers. It was found that those cores may negatively affect the mining operation. On the one hand, the remaining floor material cores prevent the loading tray or ramp to fully contact the floor. Instead, the material loading ramp rests on the material cores on the floor with the result that the cut material cannot be completely loaded. On the other hand, the material cores at the roof favor the initiation and formation of cracks, which increases the risk of roof collapses.
  • pivotable cutting tools at outer circumferential faces of the cutting drums.
  • the pivotable cutting tools can be pivoted into working positions in the interspaces between the cutting drums to cut material such that no material cores remain at the roof, the mine face and the floor. Additionally, the pivotable cutting tools can pivot back into a resting position, in which the cutting tools do not substantially extend into the interspaces to prevent a collision with a boom arm for rotatably supporting the cutting drums.
  • a continuous mining machine for use in underground mines to extract material from a mine face is generally designated by numeral 10.
  • Continuous mining machine 10 includes a mobile frame assembly 12 longitudinally extending between a front end portion 14 and a rear end portion 16.
  • Mobile frame assembly 12 includes a traction unit 18 with a crawler chain 20 at each longitudinal side for propelling continuous mining machine 10.
  • Continuous mining machine 10 also includes a boom assembly 22 supporting a cutting drum assembly 24 at a front end portion 26.
  • Boom assembly 22 is attached on one end to front end portion 14 of mobile frame assembly 12.
  • boom assembly 22 is pivotably connected to front end portion 14 to allow pivoting boom assembly 22 about a boom pivot axis B being substantially perpendicular to a longitudinal axis A of continuous mining machine 10. Said connection allows to swing boom assembly 22 and cutting drum assembly 24 in a vertical direction between a ground cut position and a roof cut position (indicated by dashed lines in Fig. 2 ).
  • cutting drum assembly 24 includes three rotatable cutting drums 24A to 24C for extracting material from a mine face. Cutting drum assembly 24 is described in detail when referring to Figs. 3 and 4 .
  • Continuous mining machine 10 includes a loading ramp or tray 28 positioned generally below boom assembly 22 and cutting drum assembly 24.
  • loading ramp 28 collects material removed from the mine face by cutting drums 24A to 24C.
  • Two rotatable collector wheels 30, 32 are mounted to loading ramp 28 to gather material.
  • the material loaded onto loading ramp 28 is then directed to a longitudinally extending conveyor 31 of continuous mining machine 10.
  • Conveyor 31 may be configured as a chain scraper conveyor, and extends from front end portion 14 in direction to rear end portion 16 and beyond to transport material from loading ramp 28 to a desired location below a rear end portion 33 of conveyor 31.
  • conveyor 31 may be pivotably connected to mobile frame 12 to allow pivoting the same in a vertical direction as indicated in Fig. 2 and/or to allow pivoting the same in a horizontal direction (not shown in the Figs.).
  • FIG. 3 a cut view through boom assembly 22 along line C-C as depicted in Fig. 2 is shown that provides a view onto outer circumferences of first outer cutting drum 24A, central cutting drum 24B, and second outer cutting drum 24C.
  • First outer cutting drum 24A, central cutting drum 24B and second outer cutting drum 24C are aligned with respect to a central longitudinal axis D, and rotatably supported by boom end portions 26 for rotating about central axis D.
  • Cutting drums 24A - 24C are operatively coupled to at least one cutter drive motor (not shown) via drive shafts 27 that rotate cutting drums 24A to 24C.
  • Drive shafts 27 are rotatably mounted in boom end portions 26.
  • the cutter drive motor may be a hydraulic motor or an electric motor that may be powered by an internal power source of continuous mining machine 10, such as an internal combustion engine, and/or an external power source being arranged remote from continuous mining machine 10.
  • Cutting drums 24A to 24C each comprise an outer circumferential face 34 extending between a respective first end face 36 and a respective second end face 38 about a central longitudinal axis D.
  • the cutting drums 24A to 24C are equipped with a plurality of cutting tools 40, for example picks, mounted to the respective outer circumferential face 34 in a distributed manner.
  • a plurality of cutting tools 40 for example picks, mounted to the respective outer circumferential face 34 in a distributed manner.
  • Fig. 3 not each and every cutting tool 40 is depicted, but merely one exemplary cutting tool 40 is shown. The presence and distribution of the remaining cutting tools is indicated by a plurality of cutting bit tips 42 of those cutting tools.
  • cutting tools 40 may be spirally distributed over the respective outer circumferential face 34.
  • cutting drums of the cutting drum assembly may not have a common central axis as exemplary disclosed herein.
  • rotation axes of the cutting drums may be (slightly) angled to one another.
  • Cutting tools 40 may each include a replaceable cutting bit 44 with the respective cutting bit tip 42, and a cutting bit holder 46 for receiving cutting bit 44.
  • Cutting bit holders 46 are secured to outer circumferential face 34, for example by a weld joint or a plurality of bolts (not shown).
  • first outer cutting drum 24A, central cutting drum 24B and second outer cutting drum 24C are arranged spaced apart from one another.
  • the interspaces between adjacent cutting drums are required for mounting cutting drum assembly 24 to boom end portions 26.
  • a clearance between first end face 36 of first outer cutting drum 24A and first end face 36 of central cutting drum 24B may be within a range between 200 mm and 300 mm.
  • Cutting tools 40 which are fixedly mounted to outer circumferential faces 34 of cutting drums 24A to 24C, do not reach into the interspace between neighboring cutting drums. As described in the following, a plurality of pivot cutter units 50, 52 are provided for pivoting into the interspace for cutting the material cores at the roof, the mine face, and the floor, which remain uncut by cutting tools 40.
  • Pivot cutter units 50 and 52 each include a pivotable support arm (cutter arm) 54.
  • Support arm 54 is pivotably mounted to outer circumferential face 34 of a respective cutting drum to pivot between a working position and a resting position about a pivot axis E, which extends perpendicular to central axis D.
  • Support arm 54 includes a tool holder 55 and a replaceable cutting tool 56 received by tool holder 55.
  • cutting tool 56 for example a pick, is positioned beyond the confines of an adjacent cutting drum end face 36 or 38 in a direction of central axis D and away from the respective other, remote cutting drum end face 36 or 38.
  • the resting position shown in the resting position (shown in Fig.
  • cutting tool 56 is positioned within the confines of circumferential face 34 with respect to central axis D.
  • cutting tools 56 are positioned in the interspaces between neighboring cutting drums in their working positions, and cutting tools 56 are not positioned in said interspaces in their resting positions.
  • the interspaces radially extend from central axis D in the clearance region between two neighboring cutting drums.
  • cutting tool 56 supported by support arm 54 of first pivot cutter unit 50 is positioned in the interspace between central cutting drum 24B and second outer cutting drum 24C in the working position, and is pivoted inwards to be positioned within the confines of circumferential face 34 of central cutting drum 24B with respect to central axis D in the resting position.
  • cutting tool 56 supported by support arm 54 of second pivot cutter unit 52 is positioned in the interspace between central cutting drum 24B and first outer cutting drum 24A in the working position, and is pivoted inwards to be positioned within the confines of circumferential face 34 of central cutting drum 24B in the resting position.
  • Support arms 54 are guided between working and resting positions by a respective guiding member 58.
  • guiding member 58 is integrally formed with support end portion 26 of boom assembly 22 to provide a particular guiding contour. Said guiding contour guides support arm 54 out of engagement with the material as support arm 54 approaches support end portion 26 during a rotation of the respective cutting drum, holds support arm 54 in the resting position as the same passes support end portion 26, and guides support arm 54 back into engagement with the material as the same moves away from support end portion 26.
  • Guiding members 58 ensure that support arms 54 are pivoted in their resting positions to prevent a collision with a respective boom end portion arm 26, which extends in the interspace between neighboring cutting drums and rotatably supports drive shaft 27 therein. Cutting tools 56 are pivoted into the working position if facing away from boom assembly 22, in other words, facing in direction to the working face to extract material therefrom.
  • guiding members 58 may guide support arms 54 for about a half turn about central axis D in the resting position and may allow support arms 54 to pivot in the working position for the other half turn about central axis D.
  • pivot cutter units 50, 52 are configured such that, in the working position, cutting tips 57 of cutting tools 56 in the interspaces between neighboring cutting drums 24A, 24B and 24C complete the uniform distribution of cutting tips 42 along cutting drum assembly 24 with respect to radial positions relative to central axis D and/or distance to one another measured in direction of central axis D (indicated in Fig. 3 by the uniform distribution of cutting tips 42, 57 schematically depicted below and above cutting drum assembly 24).
  • Pivot cutter units 50, 52 are fastened to end sections of outer circumferential faces 34 via a respective base plate 60.
  • base plates 60 are fastened by means of a plurality of bolts or screws to respective outer circumferential faces 34.
  • any other known fastening mechanism may be used to fixedly attach the base plates to the outer circumferential faces of the cutting drums, for example weld joints.
  • a plurality of pivot cutter units 50, 52 may be mounted to the same outer circumferential face adjacent the same cutting drum end face in an equidistant arrangement to one another about the central axis D.
  • first outer cutting drum 24A may be equipped with two, three or four pivot cutter units 50 arranged adjacent first end face 36 of cutting drum 24A.
  • pivot cutter units 50, 52 of neighboring cutting drums may be arranged in a phase-shifted arrangement (not shown in Fig. 3 ).
  • first outer cutting drum 24A has two first pivot cutter units 50 arranged adjacent first end face 36 in an equidistant arrangement to one another about central axis D
  • central cutting drum 24B has two second pivot cutter units 52 arranged adjacent second end face 38 in an equidistant arrangement to one another about central axis D
  • one pivot cutter unit of the group of first and second cutter units 50, 52 may be arranged every 90° about central axis D, in other words, every quarter circle.
  • pivot cutter units at one of two neighboring cutting drums only, and/or to provide more than one cutting tool at one support arm.
  • base plate 60 may include an arcuate bottom contact face (not shown) for matching with outer circumferential faces 34.
  • Support arms 54 are pivotably connected to base plates 60 via a respective pivot mechanism and preloaded in the working position via a preload mechanism.
  • Examples of said pivot and preload mechanisms include, but are not limited to, the exemplary embodiment shown in Fig. 4 .
  • a first support arm end 66 of support arm 54 is pivotably mounted to base plate 60 via a bearing 68 and a bearing sleeve 70 fixedly attached to base plate 60.
  • bearing 68 may be a slide bearing or a roller bearing.
  • support arm 54 is preloaded in the working position by a torsion spring 72 arranged in an interior of bearing sleeve 70.
  • a bottom end of torsion spring 72 is fastened to base plate 60.
  • a torsion spring nose 74 of torsion spring 72 is provided for connection with a cover member (not shown) of support arm 54.
  • the cover member engaging with torsion spring nose 74 is turned about pivot axis E and bolted or screwed to fastening openings 76 to apply a preload against support arm 54, which presses the same against an end stop or end plate 78 in the working position.
  • End stop 78 may be positioned adjacent to a respective cutting drum end face 36 or 38.
  • end stop 78 of first pivot unit 50 of central cutting drum 24B may be positioned adjacent to first end face 36 of central cutting drum 24B (see Fig. 3 ).
  • a guide element 82 such as a rolling element may be included in second end portion 80 of support arm 54. Rolling element 82 and guide member 58 (see Fig. 3 ) may interact to smoothly guide support arm 54 into the resting position.
  • continuous miner 10 pivots drum assembly 24 via boom assembly 22 up and down (see Fig. 2 ).
  • Cutting drums 24A - 24C are rotated about central axis D, and cutting tools 40 perform cutting work at the mine face.
  • cutting tools 56 of pivot cutter units 50, 52 are pivoted into the interspaces between cutting drums 24A - 24C by the preload applied by torsion spring 72 as soon as guiding member 58 allows pivoting when the respective pivot cutter unit 50, 52 has passed the respective boom support end 26 for preventing a collision.
  • Cutting tools 56 cut the material core at the roof, the floor, and the mine face, which remain uncut by cutting tools 40, during about a half turn of the respective cutting drum about central axis D.
  • pivot cutting units 50, 52 are guided into their resting position by guiding member 58 against the preload applied by torsion spring 72 for about a half turn for preventing any collision with boom end support 26.
  • cutting drum and cutting drum assembly is particularly suitable for integration in a continuous mining machine used for room and pillar mining or for driving tunnels in longwall mining applications
  • other mobile mining and milling machines may include the systems as disclosed herein for obtaining the same and/or further advantages.
  • the system(s) as disclosed herein may be implemented in surface miners and road mills etc.

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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)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
EP15180016.6A 2015-08-06 2015-08-06 Schneidtrommel mit schwenkbarer schneideinheit Withdrawn EP3128126A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP15180016.6A EP3128126A1 (de) 2015-08-06 2015-08-06 Schneidtrommel mit schwenkbarer schneideinheit
PCT/EP2016/001356 WO2017021007A1 (en) 2015-08-06 2016-08-05 Cutting drum with pivot cutter unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP15180016.6A EP3128126A1 (de) 2015-08-06 2015-08-06 Schneidtrommel mit schwenkbarer schneideinheit

Publications (1)

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EP3128126A1 true EP3128126A1 (de) 2017-02-08

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EP15180016.6A Withdrawn EP3128126A1 (de) 2015-08-06 2015-08-06 Schneidtrommel mit schwenkbarer schneideinheit

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EP (1) EP3128126A1 (de)
WO (1) WO2017021007A1 (de)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2808253A (en) 1952-11-08 1957-10-01 Goodman Mfg Co Continuous miner of the rotating drum type
US3290099A (en) * 1963-11-22 1966-12-06 Westinghouse Air Brake Co Core cutters for ripper type miners
US4391472A (en) * 1980-10-17 1983-07-05 The Cincinnati Mine Machinery Company Core eliminator for mining, road working or earth moving machinery
DE3737864A1 (de) * 1987-11-07 1989-05-18 Gewerk Eisenhuette Westfalia Schneidkopf einer vortriebs- oder gewinnungsmaschine
EP1350893A1 (de) * 2002-04-05 2003-10-08 Spie Fondations Fräsrad und Schlitzwandfräse umfassend mindestens zwei Fräsräder

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2808253A (en) 1952-11-08 1957-10-01 Goodman Mfg Co Continuous miner of the rotating drum type
US3290099A (en) * 1963-11-22 1966-12-06 Westinghouse Air Brake Co Core cutters for ripper type miners
US4391472A (en) * 1980-10-17 1983-07-05 The Cincinnati Mine Machinery Company Core eliminator for mining, road working or earth moving machinery
DE3737864A1 (de) * 1987-11-07 1989-05-18 Gewerk Eisenhuette Westfalia Schneidkopf einer vortriebs- oder gewinnungsmaschine
EP1350893A1 (de) * 2002-04-05 2003-10-08 Spie Fondations Fräsrad und Schlitzwandfräse umfassend mindestens zwei Fräsräder

Also Published As

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WO2017021007A1 (en) 2017-02-09

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