GB2130993A - Holding down device for rope haulages - Google Patents

Holding down device for rope haulages Download PDF

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Publication number
GB2130993A
GB2130993A GB08230324A GB8230324A GB2130993A GB 2130993 A GB2130993 A GB 2130993A GB 08230324 A GB08230324 A GB 08230324A GB 8230324 A GB8230324 A GB 8230324A GB 2130993 A GB2130993 A GB 2130993A
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GB
United Kingdom
Prior art keywords
rollers
shaft
down device
holding down
rope
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.)
Granted
Application number
GB08230324A
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GB2130993B (en
Inventor
Gordon Bertram Dawson
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.)
Barker & Co Ltd R E
Original Assignee
Barker & Co Ltd R E
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 Barker & Co Ltd R E filed Critical Barker & Co Ltd R E
Priority to GB08230324A priority Critical patent/GB2130993B/en
Publication of GB2130993A publication Critical patent/GB2130993A/en
Application granted granted Critical
Publication of GB2130993B publication Critical patent/GB2130993B/en
Expired legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21CMINING OR QUARRYING
    • E21C29/00Propulsion of machines for slitting or completely freeing the mineral from the seam
    • E21C29/04Propulsion of machines for slitting or completely freeing the mineral from the seam by cable or chains
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B61RAILWAYS
    • B61BRAILWAY SYSTEMS; EQUIPMENT THEREFOR NOT OTHERWISE PROVIDED FOR
    • B61B12/00Component parts, details or accessories not provided for in groups B61B7/00 - B61B11/00
    • B61B12/02Suspension of the load; Guiding means, e.g. wheels; Attaching traction cables
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65HHANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H57/00Guides for filamentary materials; Supports therefor
    • B65H57/14Pulleys, rollers, or rotary bars

Abstract

A holding down device for a rope haulage comprises first and second rollers (12) mounted for rotation about generally vertical axes and arranged to cooperate with each other. The rollers (12) are biased to a position in which a haulage rope (37) passing between the rollers (12) is held down by upper flanges (39) on the rollers. Each roller is supported on a roller shoe (4) which is mounted for rocking movement on a pivot shaft (27) against the bias, with the two shoes (4) rocking in opposite senses to allow a clip on the rope (37) to pass between the rollers (12). Each shoe (4) is supported on its pivot shaft (27) by resilient means such as disc springs or Belleville washers (17) to absorb shock loads on the rollers (12) in the direction of movement of the rope (27) between the rollers (12) when the latter are struck by the clip. <IMAGE>

Description

SPECIFICATION Holding down device for rope haulages This invention relates to a holding down device for rope haulages.

A great deal of the haulage of men and material underground is achieved by rope haulages. In a typical mine roadway, substantial undulations can occur and it becomes necessary to hold the hauling rope down with a holding down device, but at the same time, to allow the clip which attaches the rope to the carrying vehicle to pass "through" the holding down device.

One known holding down device incorporates a pair of hold down rollers, each supported on a roller show which is rather like a bell crank lever, with each lever being pivoted on a shaft, with the roller mounted on one arm of the lever, and the other arm bearing against a compression spring supported in a housing. As the clip passes between the two rollers, they are moved apart, causing the bell crank levers to rock in opposite senses about their pivot shaft, thus compressing the springs, which move the rollers back to their rope hold down position once the clip has passed.

The known holding down device is heavy, of complex design, and the spring forces are provided by two heavy duty externally mounted compression springs. The device is vulnerable to failure, due to the packing of dust and dirt around the moving parts, especially around the springs.

Another hold down device is known which uses rubber in torsion to provide the spring force to the moving parts. The device is extremely heavy, and again is vulnerable to ingress of dirt.

Both the above known devices also suffer from the disadvantage that they have a relatively short life, because every time a clip on the rope hits the hold down rollers, they experience a shock load in the direction of the longitudinal axis of their pivot shaft, which can damage the shoes and/or the bearings of the rollers.

We have now developed a hold down device which overcomes at least some of the disadvantages of the known devices, is of more elegant lightweight (yet sufficiently strong) design, and is significantly cheaper to produce.

According to one aspect of the present invention, we provide a holding down device for a rope haulage comprising first and second rollers mounted for rotation about generally vertical axes and arranged to co-operate with each other and biassed to a position in which a haulage rope passing between the rollers is held down by upper flanges on the respective rollers, each roller being supported on a roller shoe which is mounted for rocking movement on a pivot shaft against said bias, with the two shoes rocking in opposite senses to allow a clip on said rope to pass between the rollers, and resilient means supporting each shoe on its pivot shaft to absorb shock loads on the rollers in the direction of movement of the rope between the rollers when the latter are struck by said clip.

Preferably, the bias for each roller and its shoe is provided by a torsion force acting about the pivot shaft. Preferably, these torsion forces are provided by a torsion bar.

According to another aspect of the present invention, we provide a holding down device for a rope haulage comprising first and second rollers mounted for rotation about generally vertical axes and arranged to co-operate with each other and biassed to a position in which a haulage rope passing between the rollers is held down by upper flanges on the respective rollers, each roller being supported on a roller shoe which is mounted for rocking movement on a pivot shaft against said bias, with the two shoes rocking in opposite senses to allow a clip on said rope to pass between the rollers, and wherein the bias for each roller is provided by a torsion bar.

Preferably, resilient means support each shoe on its shaft to absorb shock loads on the rollers in the direction of movement of the rope between the rollers when the latter are struck by said clip.

Preferably a common pivot shaft is provided for each roller shoe, and preferably this extends generally horizontal in use. Preferably, the common pivot shaft is fixed directly to a sleeper for the track along which vehicles are hauled by the rope haulage to be held down.

Preferably, a single torsion bar extends through the pivot shaft, which is therefore hollow, with the ends of the shaft being connected respectively to the shoes.

Preferably, the roller shoes are mounted on opposite ends of the pivot shaft, one on either side of the sleeper through which the shaft passes, each shoe extending to the end of the shaft, and the open end of the portion of each shoe which surrounds the shaft being closed off by a loading plate keyed to one end of the torsion bar.

Preferably, this is achieved by providing flats on the ends of the bar and matching flats in an aperture passing through the centre of the loading plate. Preferably, an end plate is associated with each loading plate, the two plates being connected by suitable bolts to an end face of the respective shoe portion surrounding the end of the pivot shaft.

Preferably, each loading plate has a spigot portion extending into the interior of the hollow shaft a short distance to locate the torsion bar centrally within the shaft, the internal face of said spigot portion bearing against a spacing tube surrounding the torsion bar.

Preferably, the inner face of each loading plate immediately surrounding the spigot portion is recessed to receive the end of the pivot shaft, to a depth sufficient to allow limited movement of the loading plate, and hence the show, along the shaft, under the control of said resilient means.

Preferably, the resilient means is provided by pairs of disc springs or Belleville washers at each end of the pivot shaft, an outer end portion at each end of the shaft being of reduced diameter to receive said springs or washers, one being located to either side of an external circlip fixed to the reduced diameter end portion, and the two being located between thrust rings slidable on the reduced diameter end portion and housed with a recess in the outer end of the portion of the shoe surrounding the shaft.

At the inner end of the portion of the shoe surrounding the shaft, a further recess is provided immediately adjacent the shaft, in which is located a rotary seal held in position by a seal protector plate forming a sliding fit on the shaft. It will thus be appreciated that the washers, which provide shock absorbers at each end of the shaft, and the torsion bar, are completely sealed within the shoe/loading plates/end plates, thus preventing ingress of dust and dirt to the shock absorbers and torsion bar, and preventing deterioration in the operation of the holding down device.

Preferably, the torsion bar allows relative rocking movement of the two rollers through about 450, and a stop bar is provided to limit the movement of the rollers towards each other to their rope gripping positions.

A preferred embodiment of holding down device for a rope haulage in accordance with the present invention is now described by way of example with reference to the accompanying drawings, in which: FIGURE 1 is a plan view of the device; FIGURE 2 is a section along the line B-B in Figure 1; FIGURE 3 is a section along the line A-A in Figure 2, and FIGURES 4 and 5 are views in the direction of the arrow Z in Figure 3 showing the rollers respectively in a position of no-load, i.e. without a rope passing therebetween, and in a position of maximum load as a clip on the haulage rope passes therebetween.

Referring to the drawings, Figure 2 shows one rail R of a track for a vehicle in an underground mine supported on a sleeper 1 and held in position by a rail clamp 2 secured to the sleeper 1 by a screw 1 9. Supported on the sleeper 1 is a pivot shaft 27 which passes through a central aperture in the sleeper 1 and is welded centrally in position as shown at 29. A pair of rollers 12 are supported on the respective ends of the shaft 27 for rocking movement about the longitudinal axis of the shaft between an unloaded position as shown in Figure 4 and a fully loaded position as shown in Figure 5 under the control of a bias provided by a torsion bar 9 passing centrally through the pivot shaft 27 which is hollow. Each of the rollers 12 is supported on a shoe 4, a portion 31 of which is mounted for limited sliding and rocking movement on the shaft 27.Each roller 12 is mounted for rotation about a generally vertical axis and as can be seen from Figure 2, each shoe 4 has an axle 33 supporting two sets of roller bearings 1 8 spaced apart by a spacer 11 , the bearings being held in position on the axle 33 by a nut 25 and washer 24 and the roller 12 being located in postion by an inturned flange 35 at its lower end and a circlip 1 6 at its upper end engaging respectively beneath the lower set of roller bearings and upper set of roller bearings, the whole bearing assembly being protected by a cover plate 1 3. As can clearly be seen from Figure 2, a haulage rope is arranged to pass between the rollers 12 beneath outwardly extending flanges 39 on the rollers.

A stop bar 10 is secured to the sleeper 1 by a bolt 20 and spring washer 22 so as to control the extent of rocking movement of the roller shoes and hence the rollers on the pivot shaft 27.

Associated with the shaft engaging portion 31 of each roller shoe 4 is a loading plate 6. The loading plate 6 transmits the bias provided by the torsion bar 9 to each roller and accordingly, flats 41 are machined on each end of the torsion bar 9 which engage with matching flats defining the perimeter of a central aperture passing through the loading plate 6, thereby keying the plate 6 to the bar 9. The plate 6 has a central spigot portion 43 for locating the plate 6 within its respective end of the hollow shaft 27 and the internal faces of the spigot portions 43 bear against the respective ends of a spacing tube 8 surrounding the bar 9, and located within the shaft 27.A recess 45 immediately surrounding the spigot portion 43 is provided on the inner face of each plate 6 to locate the plate 6 on the end of the shaft 27 and hence indirectly to locate the torsion bar 9 centrally within the shaft 27. Each recess 45 has a depth sufficient to allow the plates 6 and hence the shoes 4 to move axially by a small amount relative to the shaft 27 and under the control of resilient means 30 which will hereinafter be described.

Each loading plate 6 is secured to the portion 31 of the shoe 4 by a plurality of bolts 21 passing through apertures in an end plate 7 and in the loading plate 6 and engaging in threaded sockets in the end face of the shoe portion 31. By removing an end plate 7, the torsion bar 9 can be replaced if required. A reduced diameter end portion 47 is provided on each end of the shaft 27 to accommodate the resilient means 30. The resilient means 30 each comprise a pair of disc springs or Belleville washers 17, one located to either side of an external circlip 1 5 mounted in a suitable groove formed in the reduced diameterend portion 47. On the side of each Beileville washer 1 7 remote from the circlip 1 5 a thrust ring 5 is provided which forms a close sliding fit on the reduced diameter portion 47. The thrust rings 5 are located in a recess 49 within the shoe portion 31. Again, as can clearly be seen from Figure 3, the outer face of each outer thrust ring 5 bears against an internal face of the loading plate 6, whereas the inner face of each internal thrust ring 5 controls the amount by which the shoe 4 can slide inwardly along the reduced diameter portion 47 of the shaft 27 under the control of the two Belleville washers 17. The resilient means 30 thus comprise shock absorbers at each end of the shaft 27 which will act to cushion the shock loads which occur on the rollers 12 and their bearings when the former are struck by a rope clip connecting the haulage rope 37 to a vehicle running on the rails R when a vehicle is hauled along the rails by the rope 37.

Furthermore, by providing this shock absorber at each end of the shaft 27, it is possible to rely simply upon the circlips 1 5 to secure the shoes 4 to the pivot shaft 27.

At the inner end of each shoe portion 31, a further recess 51 is provided immediately adjacent the shaft 27 in which is located a rotary seal 14 biassed against the shaft 27 and held in position by a seal protector plate 3. It will thus be appreciated that this rotary seal 14 on the inner end of each shoe portion 31 provides a seal against ingress of dust and since the outer end of each shoe portion 31 is completely closed off by the end plate 7, a completely sealed unit is provided around each end of the pivot shaft 27 thus ensuring that little or no dust can gain access to the bearing surface of the shaft 27 about which the shoe portions 31 can slide under the control of resilient means 30 and can rock under the control of the torsion bar 9. Grease can be applied to these two surfaces through suitable grease nipples 26.

From the foregoing, it will be appreciated that a simple lightweight construction of rope haulage holding down device is provided in which a degree of resilience along the axis of the pivot shaft is provided which affords protection to the bearings of the rollers 12 from the shock load which occurs when the rollers are struck by the haulage rope clip. Furthermore, the design has reduced to an absolute minimum points at which dirt and dust can enter the mechanism to jeopardise its operation.

Various modifications to the design are envisaged. For example, instead of using Belleville washers 1 7 to provide the resilient means 30, alternative resiliently deformable means may be provided such as, for example, blocks of rubber.

Furthermore, it is envisaged that instead of providing a torsion bar running centrally of the pivot shaft 27, it might be possible to replace this with alternative means for providing the spring bias to the rollers 12 such as, for example, a rubber sleeve surrounding the pivot shaft 27 and having its internal periphery bonded to the shaft 27 and it being bonded externally to the portions 31 of the shoes 4. With this construction it is envisaged that the rubber sleeve could also provide a degree of resilience along the axis of the pivot shaft to afford protection to the bearings of the rollers.

Claims (17)

1. A holding down device for a rope haulage comprising first and second rollers mounted for rotation about generally vertical axes and arranged to co-operate with each other and biassed to a position in which a haulage rope passing between the rollers is held down by upper flanges on the respective rollers, each roller being supported on a roller shoe which is mounted for rocking movement on a pivot shaft against said bias, with the two shoes rocking in opposite senses to allow a clip on said rope to pass between the rollers, and resilient means supporting each shoe on its pivot shaft to absorb shock loads on the rollers in the direction of movement of the rope between the rollers when the latter are struck by said slip.
2. A holding down device as claimed in claim 1 wherein the bias for each roller and its shoe is provided by a torsion force acting about the pivot shaft.
3. A holding down device as claimed in claim 2 wherein the torsion forces are provided by a torsion bar.
4. A holding down device for a rope haulage comprising first and second rollers mounted for rotation about generally vertical axes and arranged to co-operate which each other and biasses to a position in which a haulage rope passing between the rollers is held down by upper flanges on the respective rollers, each roller being supported on a roller shoe which is mounted for rocking movement on a pivot shaft against said bias, with the two shoes rocking in opposite senses to allow a clip on said rope to pass between the rollers, and wherein the bias for each roller is provided by a torsion bar.
5. A holding down device as claimed in claim 4 wherein resilient means support each shoe on its shaft to absorb shock loads on the rollers in the direction of movement of the rope between the rollers when the latter are struck by said clip.
6. A holding down device as claimed in any preceding claim wherein a common pivot shaft is provided for each roller shoe.
7. A holding down device as claimed in claim 6 wherein the common first axis extends generally horizontally in use.
8. A holding down device as claimed in claim 6 or claim wherein a single torsion bar extends through the pivot shaft, which is therefore hollow, with the ends of the shaft being connected respectively to the shoes.
9. A holding down device as claimed in any one of claims 6 to 8 wherein the common pivot shaft is fixed directly to a sleeper for the track along which vehicles are hauled by the rope haulage to be held down.
10. A holding down device as claimed in claim 9 wherein the roller shoes are mounted on opposite ends of the pivot shaft, one on either side of the sleeper through which the shaft passes, each shoe extending to the end of the shaft, and the open end of the portion of each shoe which surrounds the shaft being closed off by a loading plate keyed to one end of the torsion bar.
11. A holding down device as claimed in claim 10 wherein keying is achieved by providing flats on the ends of the bar and matching flats in an aperture passing through the centre of the loading plate.
12. A holding down device as claimed in claim 10 or claim 11 wherein an end plate is associated with each loading plate, the two plates being connected by suitable bolts to an end face of the respective shoe portion surrounding the end of the pivot shaft.
13. A holding down device as claimed in any of claims 10 to 12 wherein each loading plate has a spigot portion extending into the interior of the hollow shaft a short distance to locate the torsion bar centrally within the shaft, the internal face of said spigot portion bearing against a spacing tube surrounding the torsion bar.
14. A holding down device as claimed in claim 13 wherein the inner face of each loading plate immediately surrounding the spigot portion is recessed to receive the end of the pivot shaft, to a depth sufficient to allow limited movement of the loading plate, and hence the shoe, along the shaft, under the control of said resilient means.
15. A holding down device as claimed in any one of claims 1 to 3 or 5, or any one of claims 6 to 14 as dependent on any one of claims 1 to 3 or 5 wherein the resilient means is provided by pairs of disc springs or Belleville washers at each end of the pivot shaft, an outer end portion at each end of the shaft being of reduced diameter to receive said springs or washers, one being located to either side of an external circlip fixed to the reduced diameter end portion, and the two being located between thrust rings slidable on the reduced diameter end portion and housed within a recess in the outer end of the portion of the shoe surrounding the shaft.
1 6. A holding down device as claimed in claim 1 5 wherein at the inner end of the portion of the shoe surrounding the shaft, a further recess is provided immediately adjacent the shaft, in which is located a rotary seal held in position by a seal protector plate forming a sliding fit on the shaft.
17. A holding down device as claimed in any one of claims 3 to 1 6 wherein the torsion bar allows relative rocking movement of the two rollers through about 450, and a stop bar is provided to limit the movement of the rollers towards each other to their rope gripping positions.
1 8. A holding down device substantially as hereinbefore described with reference to and as shown in the accompanying drawings.
GB08230324A 1982-10-22 1982-10-22 Holding down device for rope haulages Expired GB2130993B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08230324A GB2130993B (en) 1982-10-22 1982-10-22 Holding down device for rope haulages

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08230324A GB2130993B (en) 1982-10-22 1982-10-22 Holding down device for rope haulages

Publications (2)

Publication Number Publication Date
GB2130993A true GB2130993A (en) 1984-06-13
GB2130993B GB2130993B (en) 1986-03-05

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103334749A (en) * 2012-02-24 2013-10-02 刘素华 Efficient impact anti-twist method and efficient impact anti-twist power box used for implementing the method

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104843603B (en) * 2015-04-17 2017-05-03 淮南矿业(集团)有限责任公司 Rope pressing device
CN104891368B (en) * 2015-06-16 2017-06-16 湘潭市恒欣实业有限公司 Knick point runs rope alarm protecting apparatus on SQ-1200 endless rope series tractor

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1063395A (en) * 1964-11-18 1967-03-30 Scharf Gmbh Heinrich Guide pulley device
GB1345105A (en) * 1971-02-20 1974-01-30 Passing H Guide device for traction means

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1063395A (en) * 1964-11-18 1967-03-30 Scharf Gmbh Heinrich Guide pulley device
GB1345105A (en) * 1971-02-20 1974-01-30 Passing H Guide device for traction means

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103334749A (en) * 2012-02-24 2013-10-02 刘素华 Efficient impact anti-twist method and efficient impact anti-twist power box used for implementing the method

Also Published As

Publication number Publication date
GB2130993B (en) 1986-03-05

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PCNP Patent ceased through non-payment of renewal fee