US3902325A - Shield structure for the face support in mines - Google Patents

Shield structure for the face support in mines Download PDF

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Publication number
US3902325A
US3902325A US427438A US42743873A US3902325A US 3902325 A US3902325 A US 3902325A US 427438 A US427438 A US 427438A US 42743873 A US42743873 A US 42743873A US 3902325 A US3902325 A US 3902325A
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US
United States
Prior art keywords
cap
base
shield
rocking
hinged
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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.)
Expired - Lifetime
Application number
US427438A
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English (en)
Inventor
Siegfried Sigott
Alfred Zitz
Heinrich Sussenbeck
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Voestalpine AG
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Voestalpine AG
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Publication date
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Publication of US3902325A publication Critical patent/US3902325A/en
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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
    • E21D23/04—Structural features of the supporting construction, e.g. linking members between adjacent frames or sets of props; Means for counteracting lateral sliding on inclined floor
    • E21D23/06—Special mine caps or special tops of pit-props for permitting step-by-step movement
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D17/00—Caps for supporting mine roofs
    • E21D17/02—Cantilever extension or similar protecting devices
    • E21D17/0206—Hydraulically operated extension devices
    • 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

Definitions

  • ABSTRACT A mine roof shield and support structure which has a [30] Foreign Apphcatmn Pnomy Data base and a shield, a rocking cap, and a hinged cap Dec. 28. 1972 Austria 11113/72 Supported from the base The hinged cap and the rocking cap can be independently shifted into engage- [52] D ment with the loads they are to support, and the loca- [5 i] it.
  • CI- tions at the p and h i g p are [58] Field Of Search 61/45 D, 45 C; 299/31; supported from base are well behind the end 248/35 191/170 MP thereof nearer the mine face which keeps the structure from tilting around the front end of the base.
  • the invention refers to a shield structure for the face support in mines.
  • a shield structure consists, as a rule, of a base frame, of a shield linked to the base frame and supported against this base frame by at least one prop and of a rocking cap pivotally connected to the shield.
  • the rocking cap is pivotally linked to the shield at the projecting end thereof so that the supporting force is acting on this projecting end.
  • the rocking cap does, however, not allow for an exactly defined introduction of the load at the face. Particularly with fragile roofs of the seam the supporting effect is largely dependent on random events. With known shield structures.
  • the reliability of the supporting action is dependent on the length of the shield, to the projecting end of which the rocking cap is pivotally connected, and further dependent on the length of the base frame underlying the rocking cap. If seen in a top-plan view, the front edge of the base frame is not or not sufficiently underlying the pivotal point of the rocking cap, it will be possible. particularly with weaker sill of the seam, that the shield structure is upset or tilted around the front edge of the base frame. Therefore, with known shield structures, the cantilever of the support for the roof of the seam over the front edge of the base frame is limited and further the length of the base frame is again limited by the longwall transportation means. it is, at any rate.
  • the invention now aims at avoiding the mentioned drawbacks and essentially consists in that at least one hinged cap is pivotally connected to the shield and the pivotal point ofthe rocking cap or rocking caps is, seen in a top-plan view, arranged for a certain distance behind the front edge of the base frame facing the mine face. noting that the pivotal point of the rocking cap. the pivotal point of the hinged cap and preferably also the engaging point of the prop or props acting on the shield are neighbouring one another.
  • the rocking cap is arranged such that any danger of upsetting of the structure around the front edge of the base frame is reliably avoided. when the rocking cap is subjected to load.
  • the shield structure can be clamped between the roof and the sill of the scam such that any load acting on the projecting hinged cap can no more effect upsetting of the shield structure around the front edge of the base frame.
  • the front edge of the base frame can be arranged with a greater distance from the face of the seam so that there will be a space between the front end of the base frame and the longwall transportation means sufficient for the advancing step so that the shield structure can be advanced immediately after having removed material from the face of the seam and the hinged cap is supporting the roof of the seam with a sufiicient supporting force immediately after having exposed said roof.
  • the main supporting force and anchoring force will be exerted by the rocking cap, whereas the supporting force exerted by the projecting end of the hinged cap is exerted with a defined magnitude at the face of the seam.
  • the supporting force exerted by the free end of the hinged cap at the face of the seam the free end of the hinged cap is the preferred point of load introduction has a magnitude of approximately 5 to 20 percent of the main supporting force acting on the rocking cap.
  • the resultant force of these supporting forces is located near the point of pivotal connection between the rocking cap and the shield. If this resulting force is acting on the base frame at a location behindthe front edge of the base frame, upsetting of the base frame around this front edge can be avoided.
  • the distance between the front edge of the base frame and the point of pivotal connection between the rocking cap and the shield is, seen in a top-plan view, at least one fourth, preferably at least one third. of the length of the bottom of the base frame.
  • the rocking cap or caps and the hinged cap or caps are connected to the shield by one or more common pivotal axes, noting that the axis or axes of the prop or props supporting the shield structure are preferably intersecting the pivotal axes.
  • This provides a simple construction.
  • the prop or props supporting the shield against the base frame may advantageously be arranged perpendicular to stratification so that the lowest possible load of the props will result.
  • the shield may be pivotally linked to the base frame by means of at least one link, noting that the position of said link is defined by a rod, preferably a hydraulic cylinder, of adjustable length and acting on the base frame, at the one hand, and on the link or on the shield or on the pivotal joint connecting the shield with said link, on the other hand.
  • a rod preferably a hydraulic cylinder
  • This arrangement allows for a simple variation of the distance between the-free end of the hinged cap and the face of the seam within certain limits and allows, for instance, within the lower working range of the shield structure and with friable roof of the seam, foreward movement of the free end of the hinged cap till the face of the seam.
  • a further embodiment of the shield structure described makes it possible to pivotally support within certain certain limits the rocking cap also with its longitudinal axis so that said cap exerting the main supporting force is in the position to accommodate in particularly a reliable manner to any uneveness of the roof of the seam along two planes as, up till now, was only pos sible with frame supports or jack supports.
  • FIG. 1 shows an embodiment of the invention in a transverse section through the longwall with the shield structure in side elevation.
  • FIGS. 2 and 3 show two alternate embodiments of the shield structure in a lateral view
  • FIG. 4 shows a cross-section through another embodiment of the pivotal arrangement of the rocking cap.
  • the base frame is designated 1 and the shield is designated 2.
  • the shield 2 is pivotally connected to the base frame 1 by means of links 3 and pivotal pins 4 and 5.
  • a rocking cap 6 is linked for rocking movement around an axis 7.
  • a hinged cap 8 is linked to the shield for swinging movement around the same axis 7.
  • the shield is supported by two props 9 arranged approximately perpendicular to stratification, noting that the upper ends of the props are supported in spherical bearings 10 arranged on the rocking cap 6 and that the lower ends of the props are supported in spherical bearings 11 provided on the base frame.
  • the rocking cap 6 When applying the shield structure, the rocking cap 6 is pressed against the .roof 12 of the seam. Subsequently, the hinged cap 8 is applied by means ofa cylinder l4 acting at 15 on the hinged cap 8 and pivotally connected at 13 to the shield 2.
  • the supporting force is such that the supporting force of the forward end 16 of the hinged cap is 5 to percent of the supporting force exerted by the rocking cap. The resultant force of these two supporting forces is therefore near the axis 7.
  • the lower bearing 11 of the prop 9 is arranged with a distance a from the front edge 17 of the base frame 1. The distance a is more than one third, i.e., nearly one half, of the length b with which the base frame 1 is resting on the sill or floor of the seam.
  • the resulting force of the supporting forces exerted by the free end 16 of the hinged cap on the one hand and by the rocking cap 6 on the other hand will thus reliably be within the supporting area of the base frame 1 so that any upsetting or tilting over the front edge will be impossible. Additionally, the shield structure will be clamped between floor l8 and roof 12 of the seam by means of the rocking cap 6 so that the shield structure will be secured in its position.
  • the position of the links 3 is defined by a hydraulic cylinder 19, which engages the base frame at 20 and the pivotal point 5 where the shield is pivotally con nected to the links 3.
  • the inclination of the links 3 can thus be adjusted such, that in all height positions of the shield structure the distance between the free end of the hinged cap and the mine face will be the same.
  • the longwall transportation means is indicated by reference numeral 21.
  • 27 is the advancing cylinder which is supported within the base frame and is engaging the longwall transportation means 21 at 28.
  • the under-ground mining machine can be moved along said transportation means in usual manner on skids.
  • the space requirement for this underground mining machine is indicated by a dot-dash line 22.
  • the outline of the cutting tool is indicated by a dot-dash line 23.
  • 24 is the face of the seam after passing the under-ground mining machine and the drawing is illustrating that the hinged cap 8 is supporting the roof 12 of the seam approximately to the face 24 of the seam.
  • the shield structure is shown in the advanced position after passing the under-ground mining machine, noting that the front edge 17 of the base frame is located immediately adjacent the longwall transportation means 2 I
  • the longwall transportation means 21 is not located above the base frame 1 and thus is resting on the sill or floor 18 of the seam so that in all positions of the shield structure sufficient space for the under-ground mining machine is provided, the outline of which is indicated by dash-dot line 22.
  • the shield structure shown in FIG. 2 differs from that shown in FIG. 1 only in that the position of the links 3 is defined by a hydraulic cylinder 25 acting at 26 on the shield 2 and on the axis 4 by means of which the links 3 are pivotally connected to the base frame 1.
  • FIG. 3 differs from that shown in FIG. 1 in that for applying the hinged cap 8 a prop 29 is provided which is supported against the base frame 1, is arranged approximately perpendicular to stratification and is linked at 30 to the hinged cap 8.
  • FIG. 4 illustrates an embodiment provided with a rocking cap 6 being movable in longitudinal direction and transverse direction; this corresponds within certain limits to a cardanic suspension of this component part.
  • the hinged cap 8 is pivotally linked to the end 32 of the shield 2 by means of an axis 31.
  • the rocking cap 6 is supported against the base frame 1 by means of two props 9 and is surrounding axis 31 by means of a toroid bearing block. In this manner, the rocking cap 6 can also be allowed to be swivelled in a transverse plane.
  • a mine roof support and shield structure comprising a base; a shield; means fixing one end of said shield for pivotal movement relative to said base and the other end of the shield above the base; a load bearing rocking cap; means supporting said rocking cap above said base for free pivotal movement about an axis extending transversely of the base; a second, hinged, load bearing cap extending at one end thereof longitudinally beyond said base, the other end of said hinged cap being pivotal relative to the shield and independent of the rocking cap about a transverse axis located above and between the ends of said base; and separate means for independently shifting said rocking cap and said hinged cap into engagement with the loads to be supported thereby.
  • a mine roof support and shield structure as defined in claim I in which the axes about which the rocking cap and said other end of said hinged cap are pivotal are coincidental.
  • a mine roof support and shield structure as defined in claim 4 in which the longitudinal axis of said prop intersects the transverse axis about which the rocking cap is pivotable and the axis about which said other end of hinged cap is pivotable.
  • a mine roof support and shield structure as defined in claim 5 in which the means for moving the hinged cap into engagement with the load to be supported by said cap includes an extensible. base or shield supported. hydraulic cylinder for pivoting said hinged cap about the transverse axis at said other end of said cap.

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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)
  • Architecture (AREA)
  • Structural Engineering (AREA)
  • Excavating Of Shafts Or Tunnels (AREA)
  • Movable Scaffolding (AREA)
  • Earth Drilling (AREA)
  • Tents Or Canopies (AREA)
US427438A 1972-12-28 1973-12-26 Shield structure for the face support in mines Expired - Lifetime US3902325A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT1111372A AT321229B (de) 1972-12-28 1972-12-28 Schildausbau

Publications (1)

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US3902325A true US3902325A (en) 1975-09-02

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US427438A Expired - Lifetime US3902325A (en) 1972-12-28 1973-12-26 Shield structure for the face support in mines

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US (1) US3902325A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
AT (1) AT321229B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
CS (1) CS174226B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (1) DE2363832C3 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
FR (1) FR2212484B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (1) GB1431609A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
HU (1) HU167351B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
PL (1) PL97759B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
SU (1) SU683641A3 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
YU (1) YU35658B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4020640A (en) * 1975-09-26 1977-05-03 Vereinigte Osterreichische Eisen- Und Stahlwerke-Alpine Montan Aktiengesellschaft Shield structure
US4037419A (en) * 1974-12-18 1977-07-26 Dowty Mining Equipment Limited Mine roof support
US4045087A (en) * 1974-09-07 1977-08-30 Cecil Vowe Peake Mining apparatus
US4222686A (en) * 1977-04-11 1980-09-16 Kloeckner Werke Mine roof support
US4236850A (en) * 1977-12-24 1980-12-02 Thyssen Industrie Ag Shield timbering frame for timbering mines
US4386878A (en) * 1980-05-06 1983-06-07 Kozponti Banyaszati Fejlesztesi Intezet Mining equipment, mainly for extraction of heavy beds
US5584611A (en) * 1994-11-22 1996-12-17 Long-Airdox Roof support for underground excavations
US10774642B1 (en) * 2019-05-05 2020-09-15 Liaoning University Hydraulic support unit and hydraulic support for anti-rock burst roadway
US11655711B2 (en) 2018-09-24 2023-05-23 Joy Global Underground Mining Llc Roof support including extendable links
US20230340877A1 (en) * 2022-04-24 2023-10-26 Henan Polytechnic University Distributed coal cutting device for longwall face of coal mine

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2507319B2 (de) * 1975-01-11 1977-06-08 Thyssen Industrie Ag, 4300 Essen Schildausbaugestell
AT350991B (de) * 1977-11-14 1979-06-25 Voest Ag Schildausbaugestell
AT360936B (de) * 1979-02-14 1981-02-10 Voest Alpine Ag Ausbaubock
DE3211595A1 (de) * 1982-03-30 1983-10-06 Gewerk Eisenhuette Westfalia Bruch- und versatzabschirmung eines lemniskatenschildes
GB2188665B (en) * 1986-04-01 1990-02-21 Dobson Park Ind Mine roof supports
GB8707235D0 (en) * 1987-03-26 1987-04-29 Dowty Hucknall Ltd Roof support
CN114562314B (zh) * 2022-03-09 2023-02-28 中国矿业大学 一种综放工作面充填液压支架及使用方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3811288A (en) * 1972-05-15 1974-05-21 Kloeckner Werke Ag Traveling face support with an attached extensible shield

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3811288A (en) * 1972-05-15 1974-05-21 Kloeckner Werke Ag Traveling face support with an attached extensible shield

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4045087A (en) * 1974-09-07 1977-08-30 Cecil Vowe Peake Mining apparatus
US4037419A (en) * 1974-12-18 1977-07-26 Dowty Mining Equipment Limited Mine roof support
US4020640A (en) * 1975-09-26 1977-05-03 Vereinigte Osterreichische Eisen- Und Stahlwerke-Alpine Montan Aktiengesellschaft Shield structure
US4222686A (en) * 1977-04-11 1980-09-16 Kloeckner Werke Mine roof support
US4236850A (en) * 1977-12-24 1980-12-02 Thyssen Industrie Ag Shield timbering frame for timbering mines
US4386878A (en) * 1980-05-06 1983-06-07 Kozponti Banyaszati Fejlesztesi Intezet Mining equipment, mainly for extraction of heavy beds
US4547098A (en) * 1980-05-06 1985-10-15 Kozponti Banyaszati Fejlesztesi Intezet Mining equipment, mainly for extraction of heavy beds
US5584611A (en) * 1994-11-22 1996-12-17 Long-Airdox Roof support for underground excavations
US11655711B2 (en) 2018-09-24 2023-05-23 Joy Global Underground Mining Llc Roof support including extendable links
US10774642B1 (en) * 2019-05-05 2020-09-15 Liaoning University Hydraulic support unit and hydraulic support for anti-rock burst roadway
US20230340877A1 (en) * 2022-04-24 2023-10-26 Henan Polytechnic University Distributed coal cutting device for longwall face of coal mine
US12049824B2 (en) * 2022-04-24 2024-07-30 Henan Polytechnic University Distributed coal cutting device for longwall face of coal mine

Also Published As

Publication number Publication date
SU683641A3 (ru) 1979-08-30
GB1431609A (en) 1976-04-14
YU334573A (en) 1980-09-25
CS174226B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1977-03-31
AT321229B (de) 1975-03-25
DE2363832A1 (de) 1974-07-04
PL97759B1 (pl) 1978-03-30
YU35658B (en) 1981-04-30
DE2363832B2 (de) 1977-08-25
HU167351B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1975-09-27
FR2212484A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1974-07-26
FR2212484B1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1976-10-08
DE2363832C3 (de) 1978-04-27

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