US3837170A - Sealing and position rectifying mechanism for shield supports - Google Patents

Sealing and position rectifying mechanism for shield supports Download PDF

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Publication number
US3837170A
US3837170A US00232101A US23210172A US3837170A US 3837170 A US3837170 A US 3837170A US 00232101 A US00232101 A US 00232101A US 23210172 A US23210172 A US 23210172A US 3837170 A US3837170 A US 3837170A
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Prior art keywords
shield
push bar
plate
gap sealing
tubes
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Expired - Lifetime
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US00232101A
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M Martinko
F Martos
T Jutas
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Banyaszati Kutato Intezet
Orszagos Banyagepgyarto Vallalat
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
    • E21D23/0004—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor along the working face
    • E21D23/0034—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor along the working face comprising a goaf shield articulated to a base member
    • E21D23/0039—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor along the working face comprising a goaf shield articulated to a base member and supported by a strut or by a row of struts parallel to the working face
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
    • E21D23/03—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor having protective means, e.g. shields, for preventing or impeding entry of loose material into the working space or support

Definitions

  • a shielding and breaking unit for long wall working in 1 pp NO 232 101 coal mines comprises a plurality of endwise al y interconnected to the base plates and to each other.
  • the shielding and g by means of hyg and breaking units are spring-urged into engagement with each other and U.S. D, breaking units are vertically wun Int. CL............................................ draulic jacks
  • the various Shieldin [58] Field of Search................ 61/45 D; 91/170 MP;
  • 299/311 33; 248/ 35 7 have working surfaces that slidably overlie each other.
  • a conveyor eg a chain conveyor parallel to the face is mounted in a cradle at the coal face side extension of the base plate.
  • a shield support at the working face as a result of the smaller or greater undulations of roof and floor the gaps between the shield units are never geometrically parallel neither in vertical, nor in horizontal section. l.e. in order to assure gap sealing there is needed'a structural solution for the suspension of the gap sealing plates enabling the angle deflection of plates both in a vertical and in a horizontal plane while the plates lies on each other.
  • gap sealing plates are used at the breaking shield and waste shield and in certain cases on the canopy too both on the waste and roof sides.
  • the gap sealing plates are attached on the roof and waste sides of the shield units to the canopy, the breaking shield and waste shield of the shield unit being supported in coaxial guiding tubes.
  • the supporting is carried out by springs.
  • the object of the invention is to develop a sealing and position rectifying or aligning mechanism for the shield supports used in mining ensuring the complete gap sealing for undulating floor, simultaneously enabling the position rectifying or aligning of the shield units as required by the face.
  • the invention involves a sealing andv position rectifying or aligning mechanism for shield "supports used in the mining having plates sealing, clos-
  • the main point of the invention is that in the direction of the symmetry axis of the coaxial guiding tubes belonging to each gap sealing plate and sliding in each other there is placed a push bar, one end of which is joined to the piston rod of the hydraulic rectifying cylinder attached turnably to the inside wall of the shield unit and the other to the limit stop of the gap sealing plate.
  • a further feature of the invention is that at least one of the hydraulic rectifying cylinders is mounted on'the face side of the shield unit and at least one of those is mounted on the waste side of the shield unit and each hydraulic rectifying cylinder is fitted with special control means.
  • a coil compression spring surrounding the outside of the push bar and the coil compression spring is formed in such way that one end rests on the closing disc of the guiding tube fixed to the breaking shield and the other end rests on the closing disc of the inside displaceable guiding tube.
  • the closing disc is fitted with an extension containing a bore through which there passes a joint pin placed into the recess formed on the stop limit plate.
  • the gap sealing plates overlap and cover the gaps left free between the adjacent shield units being displaced during the process of longwall extraction hindering the falling through of rocks.
  • the gap sealing plates are essentially L-shaped steel plates bent or welded. The blades of the plates are displaceable and slidable on the waste shield, breaking shield and canopy of the shield units by means of hydraulic rams. The other blade of the L-shaped gap sealing plate is formed as a stop limit and abuts the steel plate side wall of the adjacent shield unit under the effect of the forces mentioned above.
  • the gap sealing plates safeguard the working face protected by the shield support from rocks penetrating from above or from the waste side without hindering at all the free passage in the face.
  • the gap sealing plates laterally rectify the position of the shield unit line being especially important for flat undulous seams when the shield units can slide in relation to each other. This sliding is hindered or at least reduced by the limit stops pressed to the side walls.
  • the rectification of the lateral displacements of shield units is carried out by means of the hydraulic rectifying cylinders or rams joined to the gap sealing plates.
  • the combination of the gap sealing means and rectifying cylinders according to our invention has the advantage that the rectifying cylinders are in a protected place remaining undamaged by falling rock and enabling the undisturbed passage in both directions of the working face.
  • the rectifying cylinders join slidably to the adjacent shield units thus preventing damage to the rectifying cylinders caused by lateral displacement.
  • Our invention has the further advantage that the gap sealing between the adjacent shield units and the position rectification of the shield units is attained by combining the sealing and rectifying mechanisms, with simple means suitable for the conditions in mines.
  • FIG. 1 is a side view of the shield support.
  • FIG. 2 is a section along line lI-ll of the shield support shown in FIG. 1.1
  • FIG. 3 is a cross section along line III-Ill of the breaking shield of the unit of shield support shown in FIG. 1
  • FIG. 4 is a schematic plan view of the shield units of the shield support shown in FIG. 1.
  • FIG. is a perspective view of apparatus of the invention.
  • the breaking shield l of the shield units made of steel plates of the shield support shown in the Figures is adjustably supported with the hydraulic legs 3 resting on the base plate 2.
  • the gaps 4 between the adjacent shield units are covered by L-shaped gap sealing plates 5.
  • the upper blades of the gap sealing plate 5 following the form of the breaking shield 1 are attached slidably on its upper surface 6.
  • the lower blades of plates 5 sealing the gaps as shown in FIG. 3 are formed as limit stops 7 bearing against the side walls 8 of the adjacent shield units by means of the coil compression springs 9 with great force.
  • the springs 9 are set in the way shown in FIG.
  • Each limit stop 7 has at least two springs 9 the points of application of which are near the ends of the limit stop 7 on the coal face or waste side.
  • the push bar 18 one end of which is connected to rod 21 of the piston of the hydraulic ram 19 jointedly attached to the wall of the shield unit and the other end to the closing disc 13 of the inside displaceable guiding tube 11.
  • the hydraulic ram exerts through the push bar a high pressure on the limit stop 7 enabling the aligning of the shield support parallel to the face.
  • the gap sealing plate 5 belonging to the canopy A or the waste shield B of the shield unit is constructed as above. I I 1;
  • the hydraulic rams 19 are actuated by control means not shown in the Figures. Conforming to the control means position the pistons 20 are separately or, simultaneously actuated.
  • the-middle shield unit having simultaneouslyan inclined position compared with the two extreme shield units.
  • the ram 19 extends from the left side extreme position shown in the Figure towards the right side; thus the middle shield unit takes a position parallel to the two extreme ones. After the position rectifying above while simultaneously operating the two rams 19 the distance of the middle shield unit from the extreme ones has to be adjusted.
  • Scaling and position-rectifying mechanism for mine shield supports comprising a plurality of shields disposed in side-by-side relationship, base plate means, power means acting between said base plate means and said shields for moving said shields vertically relative to said base plate means, and gap sealing plates disposed between and covering gaps between said shields, each said gap sealing plate overlying a said shield, and means yieldably urging each said gap sealing plate into laterally abutting sealing contact with a said shield adjacent the shield said plate overlies, said urging means comprising a push bar that is pivotally connected to said plate, a hydraulic ram for extending and retracting said push bar, means pivotally mounting said hydraulic ram within the shield said plate overlies, a pair of telescoping tubes one secured to the last-named shield and the other to said pushbar, said push bar extending coaxially through said tubes, and a coil compression spring in said tubes and surrounding said push bar and urging said tubes apart.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Excavating Of Shafts Or Tunnels (AREA)

Abstract

A shielding and breaking unit for long wall working in coal mines, comprises a plurality of endwise aligned units having interconnected base plates and shielding and breaking units that are articulately interconnected to the base plates and to each other. The shielding and breaking units are vertically swung by means of hydraulic jacks. The various shielding and breaking units are spring-urged into engagement with each other and have working surfaces that slidably overlie each other.

Description

[451 Sept. 24, 1974 [56] References Cited FOREIGN PATENTS OR APPLICATIONS SEALING AND POSITION RECTIFYING MECHANISM FOR SHIELD SUPPORTS DDDD 5555 mmmm 6666 France................................
Great Britain.t....................
on aa mm rr 66 CG 48 7 6576 9999 "H 5043 200 I487 408 6746 9 c m a F .701 mo mm ao w o a Sn Vmu uH k .mfl t n ah Tt 3% 8 am y a tr aa MMB & r 0 t n e V n I 1 5 7 [73] Assignees: Banyaszati Kutato Intezet,
Primary Exaniiner- Den nis LfTaylor Attorney, Agent, or FirmYoung & Thompson Budapest; Varpalotai Szenbanyak, Varpalota; Orszagos igned units having interconnected base plates and shielding and breaking units that are articulatel Banyagepgyarto Vallalat, Budapest, all of, Hungary; part interest to each ABSTRACT [22] Filed: Mar. 6, 1972 A shielding and breaking unit for long wall working in 1 pp NO 232 101 coal mines, comprises a plurality of endwise al y interconnected to the base plates and to each other. The shielding and g by means of hyg and breaking units are spring-urged into engagement with each other and U.S. D, breaking units are vertically wun Int. CL............................................ draulic jacks The various Shieldin [58] Field of Search................ 61/45 D; 91/170 MP;
299/311 33; 248/ 35 7 have working surfaces that slidably overlie each other.
1 Claim, 5 Drawing Figures m u n u a u PAIENTEnssmlsn SIEU3I5 om Q Q NP m 9 s VIII/IIIIIA IIIIIIIIIA at right angles to the face, the waste shield fixed with a releasable joint on the waste side, and the breaking shield which is attached at the waste shield end protuding from the base plate and can be swivelled around an embedded shaft and is supported at a height required by the hydraulic legs resting on the base plate. There is a canopy or roof shield tiltable at the cantilevered end of the breaking shield. The canopy is designed for supporting the roof while extracting the longwall face and enabling a propless face. A conveyor, eg a chain conveyor parallel to the face is mounted in a cradle at the coal face side extension of the base plate. When using a shield support at the working face as a result of the smaller or greater undulations of roof and floor the gaps between the shield units are never geometrically parallel neither in vertical, nor in horizontal section. l.e. in order to assure gap sealing there is needed'a structural solution for the suspension of the gap sealing plates enabling the angle deflection of plates both in a vertical and in a horizontal plane while the plates lies on each other. For that purpose gap sealing plates are used at the breaking shield and waste shield and in certain cases on the canopy too both on the waste and roof sides.
The gap sealing plates are attached on the roof and waste sides of the shield units to the canopy, the breaking shield and waste shield of the shield unit being supported in coaxial guiding tubes. In known devices the supporting is carried out by springs. These known solutions have the disadvantage of the impossibility of rectifying the position of the shield units in relation to the face. On uneven floor also the gap sealing does not prove to be reliable because the gap sealing plate can not follow the displacement of the shield units.
The object of the invention is to develop a sealing and position rectifying or aligning mechanism for the shield supports used in mining ensuring the complete gap sealing for undulating floor, simultaneously enabling the position rectifying or aligning of the shield units as required by the face.
Consequently the invention involves a sealing andv position rectifying or aligning mechanism for shield "supports used in the mining having plates sealing, clos- The main point of the invention is that in the direction of the symmetry axis of the coaxial guiding tubes belonging to each gap sealing plate and sliding in each other there is placed a push bar, one end of which is joined to the piston rod of the hydraulic rectifying cylinder attached turnably to the inside wall of the shield unit and the other to the limit stop of the gap sealing plate.
A further feature of the invention is that at least one of the hydraulic rectifying cylinders is mounted on'the face side of the shield unit and at least one of those is mounted on the waste side of the shield unit and each hydraulic rectifying cylinder is fitted with special control means.
According to the invention in the coaxial guiding tubes in the direction of the symmetry axes of the guiding tubes there is fitted a coil compression spring surrounding the outside of the push bar and the coil compression spring is formed in such way that one end rests on the closing disc of the guiding tube fixed to the breaking shield and the other end rests on the closing disc of the inside displaceable guiding tube.
Finally according to the invention the closing disc is fitted with an extension containing a bore through which there passes a joint pin placed into the recess formed on the stop limit plate. By the solution according to the invention the gap sealing plates overlap and cover the gaps left free between the adjacent shield units being displaced during the process of longwall extraction hindering the falling through of rocks. The gap sealing plates are essentially L-shaped steel plates bent or welded. The blades of the plates are displaceable and slidable on the waste shield, breaking shield and canopy of the shield units by means of hydraulic rams. The other blade of the L-shaped gap sealing plate is formed as a stop limit and abuts the steel plate side wall of the adjacent shield unit under the effect of the forces mentioned above. Thus the gap sealing plates safeguard the working face protected by the shield support from rocks penetrating from above or from the waste side without hindering at all the free passage in the face.
Further, the gap sealing plates laterally rectify the position of the shield unit line being especially important for flat undulous seams when the shield units can slide in relation to each other. This sliding is hindered or at least reduced by the limit stops pressed to the side walls. According to our invention the rectification of the lateral displacements of shield units is carried out by means of the hydraulic rectifying cylinders or rams joined to the gap sealing plates.
The combination of the gap sealing means and rectifying cylinders according to our invention has the advantage that the rectifying cylinders are in a protected place remaining undamaged by falling rock and enabling the undisturbed passage in both directions of the working face. By means of the gap sealing plates the rectifying cylinders join slidably to the adjacent shield units thus preventing damage to the rectifying cylinders caused by lateral displacement.
Our invention has the further advantage that the gap sealing between the adjacent shield units and the position rectification of the shield units is attained by combining the sealing and rectifying mechanisms, with simple means suitable for the conditions in mines.
The invention is described by means of a detailed example on the basis of the drawings, in which:
FIG. 1 is a side view of the shield support.
' FIG. 2 is a section along line lI-ll of the shield support shown in FIG. 1.1
FIG. 3 is a cross section along line III-Ill of the breaking shield of the unit of shield support shown in FIG. 1
FIG. 4 is a schematic plan view of the shield units of the shield support shown in FIG. 1.
FIG. is a perspective view of apparatus of the invention.
The breaking shield l of the shield units made of steel plates of the shield support shown in the Figures is adjustably supported with the hydraulic legs 3 resting on the base plate 2. The gaps 4 between the adjacent shield units are covered by L-shaped gap sealing plates 5. The upper blades of the gap sealing plate 5 following the form of the breaking shield 1 are attached slidably on its upper surface 6. The lower blades of plates 5 sealing the gaps as shown in FIG. 3 are formed as limit stops 7 bearing against the side walls 8 of the adjacent shield units by means of the coil compression springs 9 with great force. The springs 9 are set in the way shown in FIG. 3 in the coaxial guiding tubes 10 and 11 sliding one in the other so that one end of the spring 9 is bearing against the closing disc 12 of the guiding tube 10 strongly fixed to the breaking shield l and the other end against the closing disc 13 of the displaceable in- 'side tube 11. The extension 14 of the closing disc 13 contains a wide bore 15 through which the joint pin 17 loosely fits into the hole 16 of the limit stop 7. Thus between the limit stop 7 and the closing disc 13 of the inside guiding tube 11 there can be realized an articulated connection for bringing about the play necessary for covering the irregularly shaped gaps between the middle inclined shield unit and the adjacent shield units.
Each limit stop 7 has at least two springs 9 the points of application of which are near the ends of the limit stop 7 on the coal face or waste side. In the direction of the symmetry axis of the spring 9 there is mounted the push bar 18 one end of which is connected to rod 21 of the piston of the hydraulic ram 19 jointedly attached to the wall of the shield unit and the other end to the closing disc 13 of the inside displaceable guiding tube 11. The hydraulic ram exerts through the push bar a high pressure on the limit stop 7 enabling the aligning of the shield support parallel to the face.
The gap sealing plate 5 belonging to the canopy A or the waste shield B of the shield unit is constructed as above. I I 1;
The hydraulic rams 19 are actuated by control means not shown in the Figures. Conforming to the control means position the pistons 20 are separately or, simultaneously actuated.
Of the three shield units shown in FIG. 4 the left and right ones are fixed between floor and roof, the-middle shield unit having simultaneouslyan inclined position compared with the two extreme shield units. In this case after loosening the shielduni'tin inclined position by feeding pressure mediumlinto the hydraulic ram 19 placed nearer to the lower edge, the ram 19 extends from the left side extreme position shown in the Figure towards the right side; thus the middle shield unit takes a position parallel to the two extreme ones. After the position rectifying above while simultaneously operating the two rams 19 the distance of the middle shield unit from the extreme ones has to be adjusted.
We claim:
1. Scaling and position-rectifying mechanism for mine shield supports, comprising a plurality of shields disposed in side-by-side relationship, base plate means, power means acting between said base plate means and said shields for moving said shields vertically relative to said base plate means, and gap sealing plates disposed between and covering gaps between said shields, each said gap sealing plate overlying a said shield, and means yieldably urging each said gap sealing plate into laterally abutting sealing contact with a said shield adjacent the shield said plate overlies, said urging means comprising a push bar that is pivotally connected to said plate, a hydraulic ram for extending and retracting said push bar, means pivotally mounting said hydraulic ram within the shield said plate overlies, a pair of telescoping tubes one secured to the last-named shield and the other to said pushbar, said push bar extending coaxially through said tubes, and a coil compression spring in said tubes and surrounding said push bar and urging said tubes apart.

Claims (1)

1. Sealing and position-rectifying mechanism for mine shield supports, comprising a plurality of shields disposed in side-byside relationship, base plate means, power means acting between said base plate means and said shields for moving said shields vertically relative to said base plate means, and gap sealing plates disposed between and covering gaps between said shields, each said gap sealing plate overlying a said shield, and means yieldably urging each said gap sealing plate into laterally abutting sealing contact with a said shield adjacent the shield said plate overlies, said urging means comprising a push bar that is pivotally connected to said plate, a hydraulic ram for extending and retracting saiD push bar, means pivotally mounting said hydraulic ram within the shield said plate overlies, a pair of telescoping tubes one secured to the last-named shield and the other to said push bar, said push bar extending coaxially through said tubes, and a coil compression spring in said tubes and surrounding said push bar and urging said tubes apart.
US00232101A 1972-03-06 1972-03-06 Sealing and position rectifying mechanism for shield supports Expired - Lifetime US3837170A (en)

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3911686A (en) * 1973-04-19 1975-10-14 Gewerk Eisenhuette Westfalia Mineral mining installations
US3991579A (en) * 1973-11-30 1976-11-16 Mines De Potasse D'alsace S.A. Self advancing support chocks
US4002036A (en) * 1974-06-04 1977-01-11 Gullick Dobson Limited Mine roof supports
US4028898A (en) * 1975-05-17 1977-06-14 Bochumer Eisenhutte Heintzmann & Company Pit prop assembly
US4041714A (en) * 1974-11-23 1977-08-16 Gullick Dobson Limited Mine roof supports
US4092831A (en) * 1975-06-05 1978-06-06 Becorit Grubenausbau Gmbh Roof bar for surface support elements
FR2432084A1 (en) * 1978-07-27 1980-02-22 Gewerk Eisenhuette Westfalia HYDRAULIC CONTROL SYSTEM FOR DEVICE FOR COVERING INTERVALS AND FOR STABILIZATION PROVIDED FOR A SIDE ON THE CAP OR ON THE LIGHTNING SHIELD OF A SUPPORT ASSEMBLY
US4293247A (en) * 1978-12-08 1981-10-06 Gewerkschaft Eisenhutte Westfalia Seals for mine roof supports
US4432673A (en) * 1981-04-25 1984-02-21 Dowty Mining Equipment Limited Mine roof support
US4586851A (en) * 1983-06-28 1986-05-06 Kloeckner-Becorit Gmbh Levelling ram for roof-shield mine support systems
US6481933B1 (en) * 1999-11-05 2002-11-19 Dbt Deutsche Bergbau-Technik Gmbh Powered support frame for large seam thicknesses with controlled gap sealing plates
CN109196184A (en) * 2016-06-10 2019-01-11 山特维克知识产权股份有限公司 Active interim hole top support equipment

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE970540C (en) * 1949-03-10 1958-10-02 Dipl Berging Curt Boie Framework for progressive expansion in brown coal longwall mining
FR1364412A (en) * 1963-07-24 1964-06-19 Gewerk Eisenhuette Westfalia Mobile hydraulic support for use underground in mines
GB1061071A (en) * 1964-03-20 1967-03-08 Gullick Ltd Improvements in or relating to mine roof supports
DE1948280A1 (en) * 1969-09-24 1971-04-01 Krampe & Co Delay for the moving longwall mining

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE970540C (en) * 1949-03-10 1958-10-02 Dipl Berging Curt Boie Framework for progressive expansion in brown coal longwall mining
FR1364412A (en) * 1963-07-24 1964-06-19 Gewerk Eisenhuette Westfalia Mobile hydraulic support for use underground in mines
GB1061071A (en) * 1964-03-20 1967-03-08 Gullick Ltd Improvements in or relating to mine roof supports
DE1948280A1 (en) * 1969-09-24 1971-04-01 Krampe & Co Delay for the moving longwall mining

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3911686A (en) * 1973-04-19 1975-10-14 Gewerk Eisenhuette Westfalia Mineral mining installations
US3991579A (en) * 1973-11-30 1976-11-16 Mines De Potasse D'alsace S.A. Self advancing support chocks
US4002036A (en) * 1974-06-04 1977-01-11 Gullick Dobson Limited Mine roof supports
US4041714A (en) * 1974-11-23 1977-08-16 Gullick Dobson Limited Mine roof supports
US4028898A (en) * 1975-05-17 1977-06-14 Bochumer Eisenhutte Heintzmann & Company Pit prop assembly
US4092831A (en) * 1975-06-05 1978-06-06 Becorit Grubenausbau Gmbh Roof bar for surface support elements
FR2432084A1 (en) * 1978-07-27 1980-02-22 Gewerk Eisenhuette Westfalia HYDRAULIC CONTROL SYSTEM FOR DEVICE FOR COVERING INTERVALS AND FOR STABILIZATION PROVIDED FOR A SIDE ON THE CAP OR ON THE LIGHTNING SHIELD OF A SUPPORT ASSEMBLY
US4293247A (en) * 1978-12-08 1981-10-06 Gewerkschaft Eisenhutte Westfalia Seals for mine roof supports
US4432673A (en) * 1981-04-25 1984-02-21 Dowty Mining Equipment Limited Mine roof support
US4586851A (en) * 1983-06-28 1986-05-06 Kloeckner-Becorit Gmbh Levelling ram for roof-shield mine support systems
US6481933B1 (en) * 1999-11-05 2002-11-19 Dbt Deutsche Bergbau-Technik Gmbh Powered support frame for large seam thicknesses with controlled gap sealing plates
CN109196184A (en) * 2016-06-10 2019-01-11 山特维克知识产权股份有限公司 Active interim hole top support equipment
US20190153863A1 (en) * 2016-06-10 2019-05-23 Sandvik Intellectual Property Ab Active temporary roof support apparatus
RU2721666C1 (en) * 2016-06-10 2020-05-22 Сандвик Интеллекчуал Проперти Аб Device for active temporary reinforcement of mine working roof
US10815781B2 (en) * 2016-06-10 2020-10-27 Sandvik Intellectual Property Ab Active temporary roof support apparatus
AU2016409814B2 (en) * 2016-06-10 2022-08-11 Sandvik Intellectual Property Ab Active temporary roof support apparatus

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