US3376707A - Advanceable roof prop arrangement - Google Patents

Advanceable roof prop arrangement Download PDF

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US3376707A
US3376707A US583367A US58336766A US3376707A US 3376707 A US3376707 A US 3376707A US 583367 A US583367 A US 583367A US 58336766 A US58336766 A US 58336766A US 3376707 A US3376707 A US 3376707A
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Prior art keywords
prop
roof
advancing
advance
advancing means
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Dommann Gunther
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Gewerkschaft Eisenhutte Westfalia GmbH
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Gewerkschaft Eisenhutte Westfalia GmbH
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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
    • E21D23/0052—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor with advancing shifting devices connected therewith
    • 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
    • E21D23/006—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor provided with essential hydraulic devices
    • E21D23/0073—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor provided with essential hydraulic devices with advancing shifting devices connected therewith

Definitions

  • the present invention relates to an advanceable roof prop arrangement, and more particularly a hydraulically energizable arrangement of suoh type including at least three prop means each coupled at the corresponding lower and upper portions thereof with a corresponding common lower beam and u-pper beam by means of respective lower and upper advancing means disposed on each prop means.
  • Roof prop arrangements which contain a pusher bar laterally situated at the forward portion theref of so as to make possible by displacing such pusher bar with respect to the prop means the forward advance of a mining conveyor in connection with longwall m-ining operations.
  • a conveyor is usually disposed longitudinally along a mine face, such -as a cool face, and a winning machine, such as a mining plow or mining planer, is displaced longitudinally back and forth along such conveyor in extractive engagement with the mine face so as to cause mineral being won to be guided onto the conveyor for removal from the site of operations.
  • the conveyor must normally be urged in the forward direction of advance so that the mining machine used therewith may be kept in urging extractive engagement with the mine face.
  • the roof cap of such a prop frame, or the like is often provided with a l preliminary cantilevered projection.
  • the conveyor may be urged in increments progressively toward the mine face as such new layers of mineral are exposed, without havin-g to release the prop means from supporting engagement with the roof and floor.
  • junction points of such articulated or rotating bars are connected to the chain which drives the winning machine and are pulled forward in the direction of advance by the back and forth movement of the chain-driven winning machine, a control brought about by the tension or pressure in the .articulated bars, making in each instance one or ano-ther of t-he prop units a stationary point for causing the advance of the remaining prop unit or units with respect thereof.
  • such bar serves as a support for pulling forward the remaining prop units or frames which have yet to be advanced.
  • three prop units are connected to the beam, when the beam is advanced two such prop units are maintained under roof supporting pressure while the third prop unit or frame is retracted from such engagement so that it may be moved forward.
  • the roof is b-rittle and caves in when such prop unit is loosened, the roof cap of the frame being advanced will usually become stuck against the roof, and as the -tloor skid is advanced, a bending force will be applied to the props in the frame or unit.
  • the prop means will accordingly assume a rearwardly inclined position and the desired forward movement thereof under load becomes impossible.
  • FIG. 1 is a schematic side elevation partially in section of a prop frame or unit having lower and upper beams in accordance with one embodiment of the present invention
  • FIG. 2 is a schematic top view of an arrangement composed of -a group of three adjacent prop frames or units of the type shown in FIG. 1, illustrating in phantom certain details of construction;
  • FIG. 3 is a schematic side elevation partially in section D of an alternate embodiment of a prop frame or unit in accordance with the present invention
  • FIG. 4 is a schematic top view showing an arrangement composed of three prop frames or units of the type shown in FIG. 3, with certain details of construction being shown in phantom;
  • FIG. 5 is a schematic side elevation view partially in section of a further embodiment in accordance with the present invention.
  • FIG. 6 is a schematic top view of an arrangement of three prop frames or units of the type shown in FIG. 5 yet with the modification of a hinged or jointed top beam.
  • an advanceable hydraulic roof prop arrangement which comprises at least three individual laterally adjacent prop means each coupled at the corresponding lower portion thereof by a separate lower advancing means to a common lower beam independently disposed therealong and each coupled at the corresponding upper portion thereof by a separate upper advancing means to a common upper beam independently disposed therealong, each said advancing means being separately operable to displace linearly with respect to each other the particular prop means and the corresponding beam coupled thereby.
  • At most some of said at least three prop means may be displaced linearly via their corresponding lower and upper advancing means simultaneously so as to advance said at most some of said prop means while the remainder of said advancing means are held from operation and thus prevent linear displacement of the remainder of said at least three prop means with respect to said beams and thereafter said remainder of said at least three prop means may be displaced linearly via said remainder of the corresponding7 lower and upper advancing means simultaneously so as to advance said remainder of said at least three prop means while the corresponding lower and upper advancing means of the already advanced prop means are held from operation, with the prevention substantially of any tilting of said prop means during the advancement thereof even when said prop means are under load during such advancement.
  • each such prop means is in the form of a prop frame having a oor skid and a roof supporting cap as well as at least two upright vertically extensible and retractable pit props interposed therebetween.
  • the upper beam be guidedly displaceable in each corresponding roof cap.
  • the advancing means may take the form of any linearly displaceable means capable of change in effective length, such as a piston-cylinder means which may be hydraulically or pneumatically controlled and/ or operated, whereby to achieve the relative displacement of the individual prop means and the lower and upper beams, as the case may be.
  • the roof cap may be provided with a preliminary supporting cap connected thereto with a preliminary upwardly and outwardly inclined auxiliary piston-cylinder means extending from the lower portion of each prop frame to such preliminary cap to support the preliminary cap thereat.
  • a further feature lof the present invention contemplates the provision for a preliminary upwardly and outwardly auxiliary piston-cylinder means extending from the lower portion of each prop frame to the upper beam whereby to support such upper beam.
  • the upper beam is composed of parallel subelements jointed to one another for articulation about corresponding parallel axes extending in the linear direction of advance.
  • a further optional feature of the invention includes the positioning of lateral piston-cylinder means on each prop frame so as to extend operatively in a direction toward the next adjacent prop frame whereby to adjust the distance between the prop frames by impinging abutment against the adjacent portion of the next adjacent prop frame.
  • Such lateral piston-cylinder means may be provided both on the roof cap and door skid on each prop frame to maintain proper lateral alignment of the frames with respect to each other.
  • FIG. 1 shows a prop means in the form of a prop frame 1 having a pair of upright vertically extensible and retractable mining pit props 2 and 3 interposed between the overlying roof cap 4 and iioor skid 5'.
  • the construction of prop means, such as frame 1, is well known and the prop means contemplated herein includes broadly any prop means which may consist of one or more individual props coupled together for simultaneous horizontal movement along the mine floor and preferably interposed between a roof cap and floor skid means capable of simultaneous movement with the pit prop or props, the role of such prop means being to support the mine roof to take the load thereof during mining operations.
  • a mining conveyor 6, which may be in the form of a conventional double chain scraper conveyor, is disposed longitudinally along a mine face, and prop means are situated on the side thereof remote from the mine face to support the roof.
  • a forward cantilever portion as part of the roof cap, the area over the conveyor may be protected, as shown in FIG. l.
  • a conventional advancing means S consisting of a cylinder 9 defined within the foot skid 5 of the prop means having displaceably received therein the piston 10 to which the piston rod 11 is connected, is utilized.
  • a conveyor pusher bar or lower beam 7 is disposed, more or less at the level of the adjacent side wall of the conveyor 6.
  • the beam 7 is articulatedly connected at 12 to the piston rod 11 so as to accommodate unevenness in the mine iioor while pushing conveyor 6 in the forward direction of advance,
  • the prop frame 1 In order to undertake the advance of conveyor 6, the prop frame 1 must be placed under load against the mine roof to prevent undesired rearward movement of frame 1 under the i counter-weight of the conveyor and the mineral contents disposed thereon.
  • an additional upper advancing means 14 preferably in the form of a pistoncylinder means including a cylinder 15 defined within roof cap 4 in which is displaceably received the piston 15 carried on the piston rod 17.
  • an upper beam 13 is disposed at the outer end of piston rod 17 so that upon operating the advancing means 14, the beam 13 may be extended in the forward direction, for example to a position as shown in phantom to the right of beam 13 in FIG. 1.
  • beam 13 may be connected to piston rod 17 via an articulated connection 18.
  • a gang or group of three prop means of the type shown in FIG. l may be provided to achieve the advantages of the present invention, such prop means being designated 1a, 1b and 1c,
  • the ganged prop means are formed of prop frames of the type shown in FIG. 1, and it will be realized that more than three such prop means may be ganged together for the desired purposes.
  • the reference numerals in the gang structure of FIG. 2 are the same as those for the individual prop means 1 of FIG. l since the arrangement of FIG. 2 contemplates the use of three prop frames of the type shown in FIG. 1. From FIG.
  • the upper beam 13, in accordance with the present invention is attached to the upper end portions of the respective frames 1a, 1b and 1c via the appropriate advancing means 14 located in the respective roof caps 4 but shown only in frame 1n.
  • the lower beam 7 is attached via the corresponding lower advancing means S with the respective oor skids 5 of the three (or more) prop means ganged together.
  • an optional feature is provided in accordance with the present invention in order to maintain alignment of the three prop units 1a, 1b and 1c, such feature being in the form of the lower lateral pistoncylinder means 19 mounted within the appropriate floor skid S and the upper lateral piston-cylinder means 20 mounted in the appropriate roof cap 4.
  • the piston-cylinder means 19 and Z0 direct their force laterally so as to impinge via the projecting lower piston rod 21 and projecting upper piston rod 22, as the case may be, against the adjacent portion of the next adjacent prop means.
  • the arrangement of ganged prop means including at least three such prop means, e.g. 1a, 1b and 1c, is maintained with the roof caps under load in pressure engagement with the mine roof during the entire mining operation. This ensures that the mine roof will not be robbed of support or disturbed by alternate thrusts of pressure and release from pressure which would otherwise -be caused by the extension and retraction of the particular roof cap to enable the particular prop means to be advanced.
  • rst the beams 7 and 13 may be extended up to their full amplitude in terms of the linear displacement inherent in the advancing means S and 14, whereby the lower beam will eiect the operative emergence forward in the direction of advance of the conveyor 6 thereat while the upper beam will guide along the mine roof therebefore in the vicinity of the mine face thereat.
  • sensing means or detecting means may be employed to determine the amplitude of displacement of the advancing means 14 to permit the upper beam 13 to just engage the mine face thereat (see the article regarding the automation of roof supports in longwall mining for the prevention of roof breakouts by O. Jacobi, Essen, Germany, in Glcêt, vol. 101, No. 14, July 7, 1965).
  • one prop means or two non-adjacent prop means in the ganged group of three or more prop means may be advanced by reverse actuation of the lower and upper advancing means thereof attached to the beams 7 and 13, while under load, without adverse er'fect on the mine roof, so long as the remaining prop unit or pair of non-adjacent prop units in the group are maintained more or less in their original position under load.
  • the foregoing can be accomplished by energizing in reverse direction the upper and lower advancing means 8 and 14, for example, of the prop unit 1b so that such prop unit will advance up to the now advanced beams 7 and 13, after which the non-adjacent prop units 1a and 1c may be advanced by reverse actuation of their lower and upper advancing means 8 and 14 to bring the same closely adjacent not only the previously advanced prop unit 1b but also the comm-on lower beam 7 and common upper beam 13.
  • conventional valve control means are employed for energizing the advancing means 8 and 14 so that after the simultaneous energizing of all of the advancing means 14 and after the simultaneous energizing of all the advancing means 8 whereby to extend the beams 13 and 7, those non-adjacent advancing means 14 and 7 indigenous to the non-adjacent prop units to lbe rst advanced under load may be energized in reverse manner to cause such non-adjacent prop units to be advanced up to the point of advance of the already advanced 'beams 13 and 7. During such time, the advancing means 8 and 14 of the remaining prop units will be held against operation to maintain in original position such remaining prop units.
  • one or more of the prop units may be advanced under load and without disturbing the disposition of the mine roof thereabove because of the common connection of the prop units being advanced and those not ybeing advanced with the upper and lower beams.
  • the present arrangement of ganged prop units or frames will permit via the optional feature of articulated connections 12 and 18 of Ibeams 7 and 13 to the appropriate piston rods 11 and 17, respectively, the shifting of the arrangement to a direction at an angle to the previous longitudinal direction of advance or alignment of a given prop unit or units to return to a previous longitudinal attitude or to achieve a new attitude, depending upon the conditions met in the mineway.
  • Versatility of operation is thereby attained, so that mobility and control of direction of advance may be enjoyed with a minimum of surveillance and attendance by the workmen.
  • a master hydraulic control valve may be employed for this purpose, with manual overtake, if desired, such that in a first step the lower and upper advancing means 7 and 14 are energized simultaneously to displace in the forward direction the beams 7 and 13, then in a second step the lower and upper advancing means of selected non-adjacent prop units in the gang arrangement are energized in reverse direction to pull forwardly under roof load such non-adjacent prop units up to the point of advance of the beams 7 and 13, and thereafter in a third step the lower and upper advancing means of the remaining prop unit or units in the gang arrangement are energized in said reverse direction to pull forwardly under roof load such remaining prop unit or units up to said point of advance of the -beams 7 and 13.
  • control means may assume the form of valve means movable in a cycle to a first position at which all advancing means 8 and 14 are energized by the flow of hydraulic or pneumatic pressure medium in the forward direction to advance the beams with respect to the gang of prop units, thence to a second position at which the advancing means of the non-adjacent selected prop units will be reverse energized by such pressure medium vwhile the non-selected remaining upper and lower advancing means will be closed of from pressure medium flow to x their position, and thence to a third position at which the advancing means of the non-selected remaining prop units will be reverse energized by such pressure medium while the already selected upper and lower advancing means will be closed olf from pressure medium ow to tix their position.
  • valve control means will take can be selected at random by the artisan, or manual control of the pressure uid medium to the upper and lower advancing means may be utilized so as to achieve the sequential advancement of non-adjacent prop units in the gang arrangeent under roof load for the desired proposes (ci. said Glcêt article).
  • an alternate em- -bodiment of the invention including as the prop means, units such as the prop frame 23 having three sets of props 24, 25 and 26 interposed vertically between the roof cap composed of members 27, 28 and 29 articulatedly interconnected at joints 30 and 31 and the oor skid 35, with the auxiliary upwardly and outwardly incined prop 32 pivotally connected at joint 33 to the forwardmost cap member 29 at its upper end and pivotally connected at joint 34 to the foot skid 35 at its lower end.
  • the props 24, 25, 26 and 32 are extensible and retractable in the same manner as props 2 and 3 of FiG. l.
  • a lower beam 36 is connected to the outer end of the piston rod of advancing means 37 shown in the form of a piston-cylinder arrangement
  • upper beam 39 is connected to the outer end of the piston rod of advancing means 40 also shown in the form of a pistoncylinder arrangement.
  • rearward p0rtions 41 on upper beam 39 extend within grooves 42 dened on the upper side of the forward cap 29 to guide the beam 39 in its back and forth movement in longitudinal direction during the operation of the advancing means 4i).
  • lower lateral piston-cylinder means 43 and upper l lateral pistoncylinder means 44 y which include the laterally projecting lower piston rod 45 and upper piston rod 46, respectively, may be used advantageously for impinging against the surface of the next adjacent prop means in order to maintain alignment of the prop units with respect to one another.
  • each prop frame 23, shown in the form of the ganged prop frames 23a, 23! and 23C, include a pair of rear props 24, a pair of intermediate props 25 and a pair of forward Props 26, with a single inclined prop 32, so as to achieve greater roof supporting ability, with the lower advancing means 37 being conveniently disposed axially between the intermediate and forward prop pairs 25 and 26, respectively.
  • the rearwardly extending portions 41 disposed displaceably within grooves 42 may be appreciated, whereby the weight of the upper beam 39 is readily distributed while the path of movement of such upper 'beam is closely guided.
  • FIGS. 3 and 4 The operation of the arrangement of FIGS. 3 and 4 is the same as that of the arrangement shown in FIGS. l and 2 since lower and upper beams 36 and 39 and lower and upper advancing means 37 and 40 are counterpart elements to lower and upper beams 7 and 13 and lower and upper advancing means 3 and 14, respectively.
  • articulated connections such as connection 38 between beam 36 and advancing means 37, may be provided in the same manner as in the embodiment of FIGS. l and 2, and if desired similar articulated connections (not shown) may be utilized be tween the upper beam 39 and the appropriate piston rod of the advancing means 4t) similar to the manner shown for the upper beam 13 at 18 in FIG. l.
  • FIG. 5 a similar prop frame 50 is shown having upwardly extending pit props 51 and 52 situated between the door skid 53 and the roof cap 54, with such props being extensible and retractable in the usual manner to achieve the desired support of the roof.
  • a lower beam 55 is shown connected to a lower advancing means 56 while an upper beam 58 is shown connected to an upper advancing means 59.
  • an upwardly and outwardly inclined prop or piston-cylinder means 62 is provided, which iS connected by the articulated connection 63 to the upper beam 5S and to the door skid 53 by the articulated connection 64.
  • the piston rod of the upper advancing means 59 is similarly connected via the articulated connection to the upper beam 53 while the lower beam 55 may also be articulatedly connected optionally via connection 57 to the piston rod of the lower advancing means 56.
  • guide elements 61 may be provided at the rearward portion of the beam ⁇ 58 extending into an appro- ⁇ priate guide opening 61a shown in phantom in cap 54.
  • FIG. 6 The embodiment of FIG. 6 is similar to that of FIG. 5 and includes three prop units of the type shown in FIG. 5, designated prop units 50a, SGb and 50c. It will be seen that the frame 5G of FIG. 5 may be provided with a pair of rear props 51 and front props 52 and with separate roof caps 54 at the underside of which the upper advancing means 59 may be disposed with a common oor skid 53 therebelow.
  • FIG. 6 an alternate arrangement of upper beam 58 as shown in FIG. 5 is provided.
  • the upper beam is designated 58' to illustrate that such beam is composed of a number of subelements 65 which are articulatedly jointed via the joints or hinged connections 66 lateraly therebetween.
  • the beam 58' may accommodate variations in ⁇ the horizontal disposition of the arrangement which may be caused by unevenness in the mine iloor or mine roof, yet without deviation of the sub-elements 65 with respect to one another, except articulation about the parallel axes of the laterally spaced apart joints 66 having axes of pivot extending in the longitudinal direction and preferably in the same vertical plane as that of the operating axes of the corresponding upper advancing means 59.
  • an upper beam is provided in the previous ganged arrangement of prop means which forms an advanceable portion of a preliminary roof cap (e.g., FIGS. 3 and 4) or an advanceable preliminary roof cap itself (eg, FIGS. l and 2 and/ or FIGS. 5 and 6). It is advantageous to provide the upper beam at the particular roof cap in question via the advancing means utilized. Indeed, in order to avoid in the advancement of the over-all ganged arrangement all orccs which might produce a tilting of the prop units or of the props in each individual frame i arrangement shown in FIG. 5
  • the individual prop frames in the ganged arrangement may be properly advanced both at the floor and at the roof in accordance with the present invention, considering adverse mining conditions, faults, uneveness in the mine floor and mine ceiling caused during mining operations, etc., whereby, after closing oif the advancing means or advancing cylinders from vdisplacement except for the one or more prop units to be advanced, to advance such unit or units forwardly under partial load by using the upper and lower advancing means for this purpose.
  • the retraction of the props of the prop units being advanced is no longer necessary, and by using the upper and/or lower beams in accordance with the present invention, it is also possible to bring about corrections in the direction of movement whenever a particular prop unit is brought into a more or less skewed or oblique position by variation of the operative length of advancing means or advancing cylinders.
  • auxiliary prop means provides the advantage of holding securely against the roof wide supports of the upper beams which constitute large area preliminary roof supporting caps (FIG. 3) in addition to being usable against the upper beam for the purpose of advancing non-adjacent prop units while under roof load (FIG. 5).
  • the upper beam of the present invention can also be constructed as a mining machine guide so as to accommodate thereat an upper mining machine, such as a planer.
  • the upper beam may in fact carry such upper mining machine for back and forth movement therealong or merely guide such mining machine thereat to achieve the constant emergence of the mining machine in extractive engagement with the upper portion of the mine face.
  • a mining machine of extraordinary height it is often necessary to provide for the guidance thereof at the upper portion of such mining machine, such as a planer, and thus guidance may be attained via the upper beam of the present invention.
  • props and/or advancing means and/or piston-cylinder means may be hydraulically or pneumatically operated, utilizing suitable pressure medium for this purpose.
  • .term advancing means as used herein is meant to embrace not only a specific doubleacting piston-cylinder means but also generally any equipment which will perform a mechanical change in effective length between two points of structural connection.
  • prop means as used herein contemplates broadly any means for supporting a mine roof or the like, preferably disposed between a floor skid and roof cap, such prop means including one or more individual pit props or the like.
  • the lower and upper beams are connected to the floor skid and the roof cap via the upper and lower advancing means, such as piston-cylinder means
  • the upper and lower advancing means such as piston-cylinder means
  • the lower beam will in any event be distinct from a mining conveyor situated at l i) the mine floor and will not be considered connected thereto but rather abuttable there-with for the purpose of pushing in a forward direction the conveyor for the desired advancement.
  • the frames in accordance with the present invention, not only will the frames be able to be advanced successively under roof load, i.e. without having to retract the individual prop frames for advance and thereafter extend the same into pressure engagement with the roof once more, but also such upper beam will serve to thrust forward any overhanging mineral to clear a path for the prop frames in the ganged arrangement to be next advanced. Additionally, the upper beam will serve as a preliminary roof support in the precarious, otherwise unsupported, roof area overlying the conveyor and mining machine alley.
  • detecting means used in connection therewith may determine the counterforce met thereby so as to avoid damage to the equipment and/ or to permit manual adjustment of the positional attitude of the particular frame or yganged arrangement so as to odset such counterforces. Since the individual prop frames will only be advanced under roof pressure after the upper beam has already been advanced, the path of movement thereof in the immediate area of the mine roof will be suciently clear to permit the advance to take place of the prop frames in the desired ordinal sequence without hindrance and without experiencing the prior art difficulties of rearward tilting of the cap and/ or props.
  • a most important advantage of utilizing the instant construction whereby the individual prop elements may be advanced while under roof load, is the fact that no disturbances of the roof will occur as would otherwise be the case in frequent extension and retraction of prop frames.
  • Such extensions and retractions can understandably cause changes in pressure on the roof and dangerous changes in the condition of the roof strata. This is especially true with regard to delicate or brittle roofs, such as those which contain draw slate.
  • a transversely misaligned prop frame may be returned to the proper positional relationship with the remaining prop frames of the group, or all of the prop frames may be influenced in their transverse disposition with respect to one another by appropriate variation in the actuation of the advancing means, for example to change the longitudinal direction of advance of the ganged arrangement for one purpose or another. Indeed, pivoting of the arrangement about a given point is thus possible where it is desired to follow a new direction of mine face operation.
  • the longitudinal disposition of one prop frame with respect to the next may be changed for the same purpose as noted immediately hereinabove or for the purpose of accommodating unevenness in the mine floor and/or mine ceiling and/or :for negotiating travel in the longitudinal direction in closer or farther apart adjacent disposition of the prop frames with respect to one another.
  • the lateral piston-cylinder means will siidingly engage the appropriate side surface of the next adjacent roof cap and/ or oor skid so that the particular side-by-side positional attitude of the adjacent frames in question may be maintained even when one such frame is fixed from movement while the other such frame is advanced.
  • the upper beam may be connected to the particular roof cap via the advancement means such that by reason of appropriate articulations, such upper beam can be shifted at an angle to the normal position for direction-correcting purposes and allowance is made for this purpose by providing the grooves on the upper side of the forwardrnost cap member of slightly greater width than the width of the corresponding rearward portion of the upper beam guided thereat.
  • Such articulations may be executed in the same manner as in connection with the articulations permitted by the analogous connections between the upper beams and advancing means of the embodiments of FIGS. 1-2 and 5-6, as the case may be.
  • a broad preliminary support of the mine roof newly exposed may be attained prior to the advance of the main prop support provided by the prop frames in question.
  • the preliminary support is aided by the presence of the upwardly and outwardly inclined prop i.e. or piston-cylinder means, yet it will be realized that the main support will still be provided by the prop frames in the ganged arrangement.
  • the important factor is to provide as close to the mine face as possible as soon as the mineral has been extracted therefrom, a preliminary support to minimize the tendency of the roof area thereat to cave-in prior to the next advance of the main prop frame thereat.
  • a detector mechanical, pneumatic or electrical, may be disposed on the upper beam near the roof to control the operation of the advancing means for the further advancement of the upper beam and/ or the lower beam and/ or for the successive advancement of the non-adjacent prop frames to be advanced, in accordance with the degree of excursion of the upper beam from the prop frame arrangement toward the mine face.
  • an advanceable roof prop arrangement which comprises at least three laterally spaced apart upright roof prop means each coupled in a longitudinal direction at the corresponding lower portion thereof by a separate and independently operable lower piston-cylinder means to a common lower beam independently disposed in a transverse direction along said at least three prop means and each coupled in said longitudinal direction at the corresponding upper portion thereof by a separate and independently operable upper piston-cylinder means to a common upper beam independently disposed in said transverse direction therealong, each said piston-cylinder means being independently operable to displace toward and away from each other in said longitudinal direction the particular prop means and the corresponding beam coupled thereby, whereby upon first operating all said piston-cylinder means to displace said beams 'in said longitudinal direction away from all said prop means l2 then at most some of said at least three prop means may be displaced in said longitudinal direction by operating the corresponding lower andtupper piston-cylinder means thereof simultaneously so as to advance in said direction said at most some prop means with respect to the remainder of said prop means while the corresponding remainder
  • such arrangement comprises three transversely spaced apart longitudinally extending prop frames capable of changing their effective roof supporting height, a common lower beam and a common upper beam each independently disposed transversely along the adjacent longitudinal ends of all three said frames at the ⁇ corresponding lower and upper end portions of said frames, and separate and independently operable corresponding lower and upper piston-cylinder meansA of changeable effective length connecting operably each frame both at the lower and upper portions thereof with the corresponding beam.
  • Advanceable hydraulic roof prop arrangement which comprises at least three individual laterally adjacent prop means each coupled at the corresponding lower portion thereof by a separate lower advancing means to a cornmon lower beam independently disposed therealong and t each coupled at the corresponding upper portion thereof by a separate upper advancing means to a common upper beam independently disposed therealong, each said advancing means being separately operable to displace linearly with respect to each other the particular prop means and the corresponding beam coupled thereby, whereby upon rst displacing linearly said beams with respect to all said prop means via said advancing means to advance said beams then at most some of said at least three prop means may be displaced linearly via their corresponding lower and upper advancing means simultaneously so as to advance said at most some of said prop means while the remainder of said advancing means are held from operation and thus prevent linear displacement of the remainder of said at least three prop means with respect to said beams and thereafter said remainder of said at least three prop means may be displaced linearly via said remainder of the corresponding lower and upper advancing means simultaneously so as to advance said
  • each of said prop means is in the form of a prop frame having a door skid and a roof supporting cap and said upper beam is guided displaceably in each corresponding roof cap, and wherein said advancing means include advancing piston-cylinder means.
  • each said roof cap is provided with a preliminary supporting cap connected thereto and a preliminary upwardly and outwardly inclined auxiliary piston-cylinder means extends from the lower portion of each said prop frame to said preliminary cap to support said preliminary cap.
  • auxiliary piston-cylinder means extends from the lower portion of each said prop frame to said upper beam to support said upper beam.
  • said upper beam is composed of parallel sub-elements jointed to one another for articulation about corresponding parallel axes extending in the linear direction of advance.
  • lateral piston-cylinder means are provided on each said prop frame extending operatively in a direction toward the next adjacent prop frame to adjust the distance between said prop yframes by impinging abutment against the adjacent portion of the next adjacent prop frame.
  • each said piston-cylinder means being independently operable to displace toward and away ⁇ from each other in said longitudinal direction the particular prop means and the corresponding beam coupled thereby, whereby upon first operating all said piston-cylinder means to displace said beams in said longitudinal direction away from all said prop means then at rnost some ⁇ of said at least three prop means may be displaced in said longitudinal direction by operating the corresponding lower and upper piston-cylinder means thereof simultaneously so as to advance in said direction said at most some prop means with respect to the remainder of said prop means while the corresponding remainder of said lower and upper piston-cylinder
  • each said Iprop means is in the form of a longitudinally extending prop frame having a iloor skid and a roof supporting cap as well as at least two upright vertically extensible and retractable pit props interposed therebetween.
  • Advanceable hydraulic roof prop arrangement which comprises three transversely spaced apart longitudinally extending prop frames capable of changing their eectiveroof supporting height, a common lower beam and a common upper beam each independently disposed transversely along the adjacent longitudinal ends of all three said frames at the corresponding lower and upper end portions of said frames, and separate and independently operable corresponding lower and upper piston-cylinder means of changeable effective length connecting operably each frame both at the lower and upper portions thereof with the corresponding beam to achieve under roof load on said frames the extension in said longitudinal direction of said beams from said frames by operating all said piston-cylinder means together to increase their effective length and thereafter the advance in said longitudinal direction of at most two non-adjacent frames of said three frames by reverse operation of the corresponding piston-cylinder means therefor to decrease their efrective length while holding the remaining piston-cylinder means from changing their effective length and in turn the remaining at least one frame from advance, and finally the advance in said longitudinal ⁇ direction of said remaining at least one frame by such reverse operation of the corresponding remainder of said piston-cylinder

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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)
  • Working Measures On Existing Buildindgs (AREA)
  • Extraction Or Liquid Replacement (AREA)
  • Soil Working Implements (AREA)
  • Excavating Of Shafts Or Tunnels (AREA)
  • Bridges Or Land Bridges (AREA)
US583367A 1965-10-02 1966-09-30 Advanceable roof prop arrangement Expired - Lifetime US3376707A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1965G0044839 DE1302918C2 (de) 1965-10-02 1965-10-02 Wandernder strebausbau

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US3376707A true US3376707A (en) 1968-04-09

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US583367A Expired - Lifetime US3376707A (en) 1965-10-02 1966-09-30 Advanceable roof prop arrangement

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US (1) US3376707A (en:Method)
DE (1) DE1302918C2 (en:Method)
ES (1) ES327814A1 (en:Method)
GB (1) GB1134552A (en:Method)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3438210A (en) * 1967-03-22 1969-04-15 Hans Joachim Von Hippel Mobile mining roof support and conveyor
US3686874A (en) * 1970-06-03 1972-08-29 Kloeckner Werke Ag Cap pull for a mining frame prop of an advancing pit support
US3911686A (en) * 1973-04-19 1975-10-14 Gewerk Eisenhuette Westfalia Mineral mining installations
US3987634A (en) * 1975-02-18 1976-10-26 Hermann Hemscheidt Maschinenfabrik Roof-supporting arrangement
US4092831A (en) * 1975-06-05 1978-06-06 Becorit Grubenausbau Gmbh Roof bar for surface support elements
US4109904A (en) * 1975-09-09 1978-08-29 Demag A.G. Passenger slide
CN101749042B (zh) * 2009-12-18 2011-09-21 辽宁天安矿山科技有限公司 掘进及时支护装置的调顶机构
CN104153803A (zh) * 2014-07-14 2014-11-19 霍忠明 一种煤矿掘进支护装置
CZ308397B6 (cs) * 2019-10-25 2020-07-22 Ostroj A.S. Důlní ocelová kloubová stropnice k zakrytí stropu v místě styku porubu s chodbou
US10882700B1 (en) * 2019-06-26 2021-01-05 China University Of Mining And Technology Embedded scraper rotation angle detection device for scraper conveyor and detection method
AU2019427994B2 (en) * 2019-06-26 2021-08-12 Anhui University of Science and Technology Embedded scraper rotation angle detection device for scraper conveyor and detection method

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2032208C3 (de) * 1970-06-30 1986-06-19 Gewerkschaft Eisenhütte Westfalia, 4670 Lünen Hydraulisch wandernde Ausbaugestelle
FR2173701B1 (en:Method) * 1972-02-28 1974-08-02 Charbonnages De France
DE8318615U1 (de) * 1983-06-28 1983-11-03 Klöckner-Becorit GmbH, 4620 Castrop-Rauxel Richtzylinder fuer den schildausbau
CN109538269A (zh) * 2018-12-27 2019-03-29 中煤北京煤矿机械有限责任公司 偏置式简易端头支架

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1195253B (de) * 1960-11-08 1965-06-24 Kloeckner Werke Ag Wandernder Strebausbau mit Ausbaugespannen

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1195253B (de) * 1960-11-08 1965-06-24 Kloeckner Werke Ag Wandernder Strebausbau mit Ausbaugespannen

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3438210A (en) * 1967-03-22 1969-04-15 Hans Joachim Von Hippel Mobile mining roof support and conveyor
US3686874A (en) * 1970-06-03 1972-08-29 Kloeckner Werke Ag Cap pull for a mining frame prop of an advancing pit support
US3911686A (en) * 1973-04-19 1975-10-14 Gewerk Eisenhuette Westfalia Mineral mining installations
US3987634A (en) * 1975-02-18 1976-10-26 Hermann Hemscheidt Maschinenfabrik Roof-supporting arrangement
US4092831A (en) * 1975-06-05 1978-06-06 Becorit Grubenausbau Gmbh Roof bar for surface support elements
US4109904A (en) * 1975-09-09 1978-08-29 Demag A.G. Passenger slide
CN101749042B (zh) * 2009-12-18 2011-09-21 辽宁天安矿山科技有限公司 掘进及时支护装置的调顶机构
CN104153803A (zh) * 2014-07-14 2014-11-19 霍忠明 一种煤矿掘进支护装置
CN104153803B (zh) * 2014-07-14 2017-01-18 霍忠明 一种煤矿掘进支护装置
US10882700B1 (en) * 2019-06-26 2021-01-05 China University Of Mining And Technology Embedded scraper rotation angle detection device for scraper conveyor and detection method
AU2019427994B2 (en) * 2019-06-26 2021-08-12 Anhui University of Science and Technology Embedded scraper rotation angle detection device for scraper conveyor and detection method
CZ308397B6 (cs) * 2019-10-25 2020-07-22 Ostroj A.S. Důlní ocelová kloubová stropnice k zakrytí stropu v místě styku porubu s chodbou

Also Published As

Publication number Publication date
GB1134552A (en) 1968-11-27
ES327814A1 (es) 1967-08-16
DE1302918B (en:Method) 1975-04-24
DE1302918C2 (de) 1975-04-24

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