GB2077830A - Underground mine self- advancing roof supports - Google Patents
Underground mine self- advancing roof supports Download PDFInfo
- Publication number
- GB2077830A GB2077830A GB8017723A GB8017723A GB2077830A GB 2077830 A GB2077830 A GB 2077830A GB 8017723 A GB8017723 A GB 8017723A GB 8017723 A GB8017723 A GB 8017723A GB 2077830 A GB2077830 A GB 2077830A
- Authority
- GB
- United Kingdom
- Prior art keywords
- unit
- support
- roof
- mode
- roof supporting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000009434 installation Methods 0.000 claims abstract description 12
- 238000004873 anchoring Methods 0.000 claims description 4
- 230000001419 dependent effect Effects 0.000 claims 1
- 238000005065 mining Methods 0.000 description 12
- 238000005520 cutting process Methods 0.000 description 9
- 229910052500 inorganic mineral Inorganic materials 0.000 description 7
- 239000011707 mineral Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- 239000011435 rock Substances 0.000 description 5
- 230000004913 activation Effects 0.000 description 4
- 238000009412 basement excavation Methods 0.000 description 3
- 238000011010 flushing procedure Methods 0.000 description 2
- 239000011800 void material Substances 0.000 description 2
- 230000001934 delay Effects 0.000 description 1
- 230000010006 flight Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
Classifications
-
- 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
-
- 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
- E21D23/066—Pivoted cantilever extensions therefor
-
- 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
- E21D23/08—Advancing mechanisms
Landscapes
- 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)
Abstract
A roof support 1 for installation adjacent to a stage loader conveyor in an underground mine comprises two units 5 and 6 interconnected by advancing means, each unit having a rearwardly extensible cantilever device 16 and 26, respectively. The support has an advancement sequence comprising a multi-stage control cycle in the first stage of which one of the units 5 is released from a roof supporting set mode and advanced from a first installed set position to a second installed set position and reset to a roof supporting set mode, and in the second stage of which the other unit 6 is released from a roof supporting set mode and advanced from the first installed set position to the second installed set position and reset to a roof supporting set mode, the rearwardly extensible cantilever device 16 associated with said one unit 5 being urged towards a roof supporting mode when said one unit is in an advanced installed set position relatively to said other unit 6 and the rearwardly extensible cantilever device 26 associated with said other unit 6 being urged towards a roof supporting mode when said other unit 6 is in the second installed set position. <IMAGE>
Description
SPECIFICATION
Underground mine self-advancing roof supports
This invention relates to underground mine selfadvancing roof supports.
In particular, although not exclusively, the present invention relates to underground mine self-advancing roof supports for installation adjacent to ends of longwall faces so as to provide support in the face areas directly in advance of service roadways leading to the faces and in the immediate vicinities of conveyors conveying cut mineral from the longwall face into the roadways.
In order to try and provide adequate support for the roof in the vicinity of a stage loader conveyor arranged to convey mineral won by a mining machine and discharged from an armoured conveyor extending along the longwall face under the ripping lip and into the roadway, it has been proposed to provide a mine roof support comprising two units, one unit being installed directly over the stage loader conveyor and the other unit having two sections arranged on opposite sides of said one unit. Control means ensure that at any one time at least one of the units is in a roof supporting mode.Thus, when the mining machine wins a strip of mineral immediately in advance of the roadway the face and stage loader conveyors are advanced by a distance substantially equal to one web of the mining machine cutter, said one unit of the roof support being advanced with the stage loader conveyor to a newly installed set position supporting the newly exposed mine roof.
However, with the prior proposed mine supports, upon the mining machine reaching the end of its traverse it is unable to recommence a new cutting traverse travelling in the opposite direction along the face until said other unit has been advanced to the newly installed set position and temporary roof supports have been installed under the ripping lip immediately to the rear of the roof support, the installation of these supports being made difficult by the presence of the stage loader conveyor.
An object of the present invention is to provide an underground mine self advancing roof support which tends to overcome or reduce the above mentioned problems tending to reduce mining machine stoppages due to the advancement of the mine roof supports.
According to the present invention, an underground mine self advancing roof support comprises two mine roof supporting units interconnected by advancing means, each unit of which comprising a base component, an upper component urgeable towards a roof supporting mode, prop means mounted between the base and upper components to urge the upper component towards the roof supporting mode and a rearwardly extensible cantilever device adapted to provide temporary roof support, and each unit being adapted to define a set anchoring unit while the other unit is released from a roof supporting set mode and advanced under the action of the
advancing means, the anchoring unit being
adapted to guide the released advancing unit
during advancement, in use, the advancement
sequence for the support comprising a multistage
control cycle in the first stage of which one of the
units is released from a roof supporting set mode
and advanced from a first installed set position to
a second installed set position and reset to a roof
supporting set mode, and in the second stage of
which the other unit is released from a roof
supporting set mode and advanced from the first
installed set position to the second installed set
position and reset to a roof supporting set mode,
the rearwardly extensible cantilever device
associated with said one unit being urged towards
a roof supporting mode when said one unit is in an
advanced installed set position relatively to said
other unit and the rearwardly extensible cantilever
device associated with said other unit being urged
towards a roof supporting mode when said other
unit is in the second installed set position.
Preferably, the sequence cycle comprises a
third stage in which said one unit is released from
a roof supporting set mode and advanced from the
second installed position to a third installed set
position and reset to a roof supporting set mode
the rearwardly extensible cantilever device
associated with said one unit being urgable
towards a roof supporting mode when said one
unit is in the third installed set position.
Advantageously, the sequence cycle comprises
a fourth stage in which said other unit is released
from a roof supporting set mode and advanced
from the second installed set position to the third
installed set position.
Preferably, said other unit comprises two 'sections arrangeable on opposite sides of said one
unit, respectively.
Preferably, said one unit is fixedly mountable
with respect to a guide section of a conveyor, the
two sections of said other unit being connectable
to the guide section by said advancing means.
Advantageously, the rearwardly extensible
cantilever device associated with said one unit
comprises a slide beam supportedly mounted on
the upper component of the unit.
Preferably, the rearwardly extensible cantilever
device associated with said other unit comprises
hinged flap means pivotally mounted on the upper
component of said other unit.
Preferably, the hinged flap means comprises a
hinged flap element bridging the two sections of
said other units.
Conveniently, the element comprises at least
two articulatedly connected parts. Alternatively,
the hinged flap means comprises two hinged flap
elements associated with the two sections of said
other unit respectively. Preferably, the hinged flap
means is urged towards the roof supporting mode
by ram means. Preferably, the ram means are
mounted between the hinged flap means and the
base component of the said other unit.
The present invention also provides an
underground mine installation comprising a mine
roof support as defined above.
By way of example, one embodiment of the present invention will be described with reference to the accompanying drawings, in which:
Figure 1 is a side elevation of an underground mine self-advancing roof support constructed in accordance with the present invention;
Figure 2 is a plan of Figure 1;
Figure 3 is an incomplete rear view of the support looking in the direction of arrow Ill in
Figure 1;
Figure 4 is a rear view of one end of a longwall face installation in an underground mine and including a roof support as shown in Figures 1, 2 and 3, the installation being drawn on a reduced scale;
Figure 5 is an incomplete plan of Figure 4;
Figure 6 is a diagrammatic plan of the end of the face installation of Figures 4 and 5, showing the roof supports in a first installed set position;;
Figure 7 is a diagrammatic plan similar to
Figure 6 but showing the roof supports in a second installed set position;
Figure 8 is a diagrammatic plan similar to
Figure 6 but showing the roof supports in a third installed set position; and
Figure 9 is a diagrammatic plan similar to
Figure 6 but showing the roof supports in a fourth installed set position.
Figures 1 to 3 of the drawings show an underground mine self advancing roof support 1 for installation adjacent to the end of a longwall face in the immediate vicinity of a scraper chain stage loader conveyor 2 comprising a plurality of guide pans (only shown in Figure 3) for an endless chain driven arrangement (not shown) which in use hauls a series of flights over a deck plate 3 defined by the pans.
The roof support 1 comprises two units 5 and 6, the unit 6 comprising two sections located on opposite sides of the central unit 5.
The central unit 5 comprises a base component 10 (omitted from Figure 2) defining d guide assembly 11 fixedly secured to the stage loader 2 and providing mountings 1 4 for four hydraulic props 12 arranged to carry an upper component 13 constituting a mine roof engaging canopy. As seen in Figure 3 the guide assembly 11 has an open bottom tending to prevent fine material building up in the vicinity of the stage loader. In operation, the props 1 2 are activated to urge the
roof engaging canopy 1 3 into a roof supporting mode. In Figures 1 and 3, the canopy is indicated
at 13' in broken lines in a non-roof supporting
mode clear of the mine roof. The canopy will take
up this lowered mode during advance of the unit 5
as will be explained later in this specification.
The central unit 5 also comprises a rearwardly extensible cantilever device 1 6 constituted by a slide beam which can be extended rearwardly from or retracted into the roof engaging canopy
13 under the action of a hydraulic ram (not shown) housed within the canopy. The beam 1 6 is extended rearwardly from the canopy into the position shown in Figure 2 to support mine roof immediately to the rear of the unit 5 when it is advanced as will be explained later in this specification.
The unit 5 also comprises a forwardly extensible cantilever device 1 7 constituted by a slide beam which can be extended forwardly from or retracted into the roof engaging canopy 1 3 under the action of a hydraulic ram (not shown) housed within the canopy. The beam 1 7 is extended forwardly from the canopy into the position shown in Figure 2 to support newly exposed mine roof prior to the support being advanced as will be explained later in this specification.
During the extensions of the beams 1 6 and 1 7 outwardly from the roof engaging canopy 13 the beams are urged upwardly towards the mine roof.
Each of the two sections of the unit 6 comprises a floor mounted base component 20 (omitted in Figure 2) arranged to slide along the mine floor when advanced as will be explained later. Each base component provides mounting 21 for two hydraulic props 22 which carry an upper component 23 constituted by a roof engaging beam and which when activated are arranged to urge the roof beam towards a roof supporting mode. The two base components 20 are rigidily interconnected by a bridge assembly 24 extending over the central unit 5 and stage loader 2. The base components 20 and 10 are arranged such that when one of the units is released in order to advance the unit the base component of the released unit is guided by the base component of the set anchored unit.
In Figure 3 the roof beam is shown at 23' in a lowered none roof engaging mode clear of the mine roof permitting advance of the unit.
The unit 6 also comprises a rearwardly extensible cantilever device 26 (omitted from
Figure 3) constituted by hinged flap means comprising a hinged flap element 27 which bridges across the two roof beams 23 of the two sections of the unit 6 and which is supported from the roof beams in pivotal mountings 28. The
hinged flap element 27 can be pivoted towards a
roof supporting mode (as shown in Figures 1 and 2) under the action of two inclined hydraulic rams 30 mounted in pivotal mounting 31 and 32
provided on the hinged flap element 27 and
associated base component 20.
In alternate embodiments of roof support the
hinged flap element comprises two articulately
connected parts tending to enable uneven mine
roofs to be negotiated.
In other embodiments the hinged flap means
comprises two separate hinged flap elements
associated with the two roof beams 23 of the two
sections of the unit, respectively.
Operation of the hydraulic components of the
roof support shown in Figures 1,2 and 3 is
controlled from control means 35 (see Figure 1)
including a manually controllable sequence valve
36.
The roof support has a multi-stage operational
sequence which will be described in detail later in
this specification with particular reference to
Figures 6, 7, 8 and 9.
Figures 4 and 5 show one end of a longwall face installation in an underground mine with particular reference to the mine roof supports including a roof support 1 as described in detail with reference to Figures 1,2 and 3. In Figures 4 and 5 the mining machine comprising a cutter for winning mineral from the working face 50 is omitted for the sake of clarity.
Figures 4 and 5 show a plurality of different roof supports 1, 51, 52, 53, 54, 55 and 56 supporting the mine roof 60 adjacent to the end of the longwall face. A service roadway 62 to the face is supported by arch type roof supports 64. In operation, as the working face is advanced by the mining machine the roadway is extended in increments by excavation of the ripping lip 65 which in Figure 5 is shown supported on rearwardly extensible cantilever beams 16 and 66 extending from the installed roof supports 1 and 51. The rearwardly extensible hinged flap element 27 which is omitted in Figures 4 and 5 also would be in a roof supporting position supporting the ripping lip 65.
In addition to the rearwardly extensible cantilever beams 66 each of the two roof supports 51 comprises a base component 70, a roof engaging canopy component 72, and three hydraulic props 73 mounted on the base component 70 to urge the canopy component 72 into a roof supporting position. Forwardly extensible cantilever beam 74 extend towards the working face to support the mine roof which has been newly exposed by passage of the mining machine cutter. As shown in Figure 5 the supports 51 are provided to support the mine roof in the vicinity of a drive arrangement 80 for the previously mentioned armoured conveyor 81 which extends along the longwall face providing a path for the mining machine and conveying material won by the mining machine cutter towards the stage loader conveyor 2 which conveys the won material into the roadway 62.
Adjacent to the two roof supports 51 are five roof supports 52 which are arranged along the length of a pack 82 built from rock debris produced by excavation of the ripping lip 65 to extend the roadway 62, the pack helping to support the rock strata adjacent to the roadway 62. The pack is built in a part of the void left by the advancing longwall face and material produced by each excavating of the ripping lip 65 is conveyed into the pack by a series of hydraulically actuated reciprocating paddles 84 mounted on the back of the supports 52 beneath the rearwardly extensible cantilever beams 85 extending from roof engaging canopies 86 of the supports 52. Each canopy 86 is urged into a roof engaging mode by four hydraulic props 87 carried on a floor mounted base component 88.Each support 52 also comprises a forwardly extensible cantilever beam 89 to support mine roof newly exposed by the passage of the mining machine cutter.
Adjacent to the end of the pack remote from the roadway 62 three buttress chock supports 53, 54 and 55 are installed. The chock 53 extends rearwardly to support the mine roof in the vicinity of the end of the pck adjacent to a goaf or void 90 left behind the advancing longwall face. As the face advances the mine roof is allowed to collapse into the goaf. The buttress chock supports 53 and 54 have articulatedly constructed roof canopies 91, 92 enabling the relatively elongated canopies to negotiate undulations in the mine roof when the associated supports are advanced. Each of the buttress chock supports comprises a floor mounted base component 93 supporting a plurality of hydraulic props 94 arranged to urge associated roof canopies 91, 92 or 95 into roof supporting modes.Each buttress chock support also comprises a flushing shield 96 tending to prevent passage of broken rock material from the collapsing goaf towards the working face and a forwardly extensible cantilver beam 97.
The remaining roof support 56 shown in
Figures 4 and 5 is one of a plurality of roof supports installed along the length of the longwall face and each comprising a floor mounted base component 98, a roof engaging canopy 99 and a plurality of hydraulic props 100 carried on the base and arranged to urge the canopy towards a roof supporting mode. Each roof support 56 also comprises a forwardly extensible cantilever beam 101 and a flushing shield 102.
Each of the roof supports 51 to 56 is provided with a hydraulic advancing ram connected between the conveyor 81 and the associated supports. These advancing rams enable the conveyor 81 or a selected portion of the conveyor to be advanced towards the working face when the roof supports are anchored in installed set roof supporting modes. Also the advancing rams enable each support in turn to be advanced towards the working face, during its advancement each support is released from its roof supporting mode by retraction of the hydraulic props. The conveyor which is retained in an advanced position by roof supporting set supports adjacent to the advancing support, provides the anchorage against which the support is advanced.
The advancing means for the roof support 1 comprises two hydraulic rams 105 which extend from the base components to the two outer sections of the unit 6 to brackets 1 06 fixedly secured to the stage loader conveyor 2. Thus, in operation when it is desired to advance the stage loader conveyor 2 towards the working face, the roof engaging canopy 13 of the unit 5 is released from its roof supporting mode to the position indicated at 13' in Figures 1 and 3 by retraction of the props 12, the advancing rams 106 then are activated to urge the stage loader conveyor forward together with the unit 5 which as previously stated is fixedly mounted with respect to the stage loader conveyor.Once the stage loader is advanced to a desired position the unit 5 is reset to its roof supporting mode to thereby anchor the stage loader conveyor which then provides an anchorage for advancement of the outer unit 6 by suitable activation of the advancing rams 1 06. Throughout advance of the units 5 and 6 the currently advancing unit 5 or 6 is guided by the anchored unit 6 or 5. In a typical installation the stage loader conveyor is fixedly secured to the discharge end of the face conveyor. In such an installation the stage loader conveyor is advanced in unison with the adjacent end portion of the face conveyor and activation of the advancing rams
106 to advance the stage loader conveyor is carried out simultaneously with activation of the advancing rams of other supports arranged along the face.
In operation, as the machine traverses along the longwall face winning strips of mineral from the working face with the machine's cutter
arranged to win a desired web on each cutting traverse, the roof supports are advanced in a
controlled preselected sequence to ensure the
newly exposed mine roof is adequately supported.
The multi-stage advancement sequence of the
supports now will be described with reference to Figures 6, 7, 8 and 9.
It will be appreciated that Figures 6, 7, 8, and 9
show the support layout diagrammatically and for
the sake of clarity the conveyor, mining machine
and support advancing means are not shown. In
addition, only three supports 52 are shown in
Figures 6 to 9 instead of five as shown in Figures
5 and 6. Support 56 is omitted from Figure 6 to 9.
Figure 6 shows the situation with all the roof
supports installed in an advanced mode set
immediately adjacent to the working face 50. The
support 1 is shown in its first installed set position
with the two units 5 and 6 advanced by an equal
amount. The supports 51 to 55 are fully advanced
and the service roadway 62 is fully extended up to
the rearmost end of the support canopies 13 and
23. In addition, the pack 82 is fully extended up to
the rearmost ends of the roof canopies of the
supports 52. No support has an outwardly extending cantilever beam.
Figure 7 shows the first stage of advancement
when the machine has just completed its cutting
traverse along the face cutting towards the end of
the face shown in the drawing i.e. in the direction
indicated by arrow x. The depth of the web of
mineral won by the cutter on the traverse is
indicated by distance a in Figure 7.
Immediately upon the machine passing a roof
support, eg support 55, the forwardly extensible
cantilever beam, eg beam is extended to support
the newly exposed mine roof. This procedure is
followed until the machine has cut its way to the
extreme end of the longwall face and the cutter
has reached the rib side 110.
Upon the machine reaching the end of the
cutting traverse the unit 5 of the support 1 is
released from its roof supporting mode as
previously explained and with the unit 6 providing
an anchor unit, the advancing rams 105 are
activated to urge the unit 5, the stage loader
conveyor 2 and the end portion of the face
conveyor 81 towards the newly advanced working
face. The advancing rams of the other supports in
the vicinity of the face end simultaneously are activated to urge the end portion of the face conveyor 81 towards the working face and the machine is shuttled to and fro enabling the cutter to progressively win mineral from the working face until it is advanced by a distance equal to the desired web depth a.Once the machine's cutter is advanced to the desired position the unit 5 is reset to the mine roof in a second installed set position in advance of the unit 6 which is still in the first installed set position. With the unit 5 in the second installed set position the rearwardly extensible cantilever beam 1 6 is extended to support the otherwise exposed mine roof in between the rearward ends of the roof beams 23 of the set unit 6.
Once the unit 5 is advanced to the second installed set position the other face supports 55to 51 are advanced in sequence the forwardly directed cantilever beams being withdrawn in sequence during advancement of the associated roof support. When all the face supports are advanced the second stage of advancement of the support 1 commences and the unit 6 of the support 1 is released from its roof supporting mode and advanced to the second installed set position. As the unit 6 is advanced the rearwara'ly extensible cantilever beam 1 6 is withdrawn. The support layout now is as shown in Figure 8 with the leading ends of all the supports set immediately adjacent to the working face.As shown in the drawing with the unit 6 in the second installed set position the hinged flap element 27 is raised into a mine roof supporting mode by activation of the inclined rams 30. Also as seen in Figure 8 the ripping lip 65 is supported by the cantilever beam 66 as well as the hinged flap element and the pack area is supported by the cantilever beams 85 and the buttress chock supports.
With the supports in the installed set position as indicated in Figure 8 the machine starts a cutting traverse along the face cutting in a direction opposite to that indicated by arrow.
Upon the machine passing the roof supports 51, 52, 53, 54 and 55 the forwardly directed cantilever beams 74, 89 and 97 are advanced to provide adequate roof support to the newly exposed mine roof. Once the machine is clear of the face end, the third stage of advancement of the support 1 commences and the end portion of the face conveyor 81 together with the stage loader conveyor 2 and unit 5 are advanced by a distance equal to the desired cutting web of the, cutter and the roof canopy 1 3 is immediately adjacent to the working face. The unit 5 then is reset to the mine roof in a third installed set position in advance of the unit 6 which remains in the second installed set position with the hinged flap element 27 in a raised roof supporting mode.
The support layout is as shown in Figure 9. The ripping lip and pack area is supported by the rearwardly directed cantilever beams.
Upon the mine operatives being ready to commence the excavation of rock from the ripping lip to extend the roadway 62, the supports 1 and
52 are advanced to a position as shown in Figure
6 with the associated roof canopies immediately adjacent to the working face. The unit 6 is
advanced during the fourth stage of advancement
until it reaches the third installed set position. The rearwardly directed cantilever beams 1 6 and 66 are withdrawn on to the roof canopies and the hinged flap element 27 is lowered to permit rock to be excavated from the ripping lip 65 to extend the roadway 62, the excavated ripping lip being equal to two web depths won by the face machine's cutter. Also, the cantilever beams 85 are withdrawn when the pack 82 is extended up to the rear of the roof canopies of supports 52.
The position now is substantially as shown in
Figure 6 and the whole advancement operation is repeated when the machine once again reaches the face end shown in the drawings.
From the above description it will be appreciated that the present invention provides a mine roof support which tends to minimise delays to the face machine's cutting operation.
Claims (16)
1. An underground mine self advancing roof support comprising control means and two mine roof supporting units interconnected by advancing means, each unit comprising a base component, an upper component urgeable towards a roof supporting mode, prop means mounted between the base and upper components to urge the upper component towards the roof supporting mode and a rearwardly extensible cantilever device adapted to provide temporary roof support, and each unit being adapted to define a set anchoring unit while the other unit is released from a roof supporting set mode and advanced under the action of the advancing means, the anchoring unit being adapted to guide the released advancing unit during advancement, in use, the advancement sequence for the support comprising a multistage control cycle in the first stage of which one of the units is released from a roof supporting set mode and advanced from a first installed set position to a second installed set position and reset to a roof supporting set mode, and in the second stage of which the other unit is released from a roof supporting set mode and advanced from the first installed set position to the second installed set position and reset to a roof supporting set mode, the rearwardly extensible cantilever device associated with said one unit being urged towards a roof supporting mode when said one unit is in an advanced installed set position relatively to said other unit and the rearwardly extensible cantilever device associated with said other unit being urged towards a roof supporting mode when said other unit is in the second installed set position.
2. A support as claimed in claim 1, in which the sequence cycle comprises a third stage in which said one unit is released from a roof supporting set mode and advanced from the second installed position to a third installed set position and reset to a roof supporting set mode, the rearwardly extensible cantilever device associated with said one unit being urgable towards a roof supporting mode when said one unit is in the third installed set position.
3. A support as claimed in claim 2, in which the sequence cycle comprises a fourth stage in which said other unit is released from a roof support set mode and advanced from the second installed set position to the third installed set position.
4. A support as claimed in claim 1,2 or 3, in which said other unit comprises two sections arrangeable on opposite sides of said one unit, respectively.
5. A support as claimed in claim 4, in which said one unit is fixedly mountable with respect to a guide section of a conveyor, the two sections of said other unit being connectable to the guide section by said advancing means.
6. A support as claimed in any one of the preceding claims, in which the rearwardly extensible cantilever device associated with said one unit comprises a slide beam supportedly mounted on the upper component of the unit.
7. A support as claimed in claim 6, in which the slide beam is rearwardly extensible from the associated upper component under the action of ram means.
8. A support as claimed in any one of the preceding claims, in which the rearwardly extensible cantilever device associated with said other unit comprises hinged flap means pivotally mounted on the upper component of said other unit.
9. A support as claimed in claim 8, when deoendent upon claim 4 in which the hinged flap means comprises a hinged flap element bridging the two sections of said other unit.
10. A support as claimed in claim 9, in which the element comprises at least two articulatedly connected parts.
11. A support as claimed in claim 8, when dependent upon claim 4, in which the hinged flap means comprises two hinged flap elements associated with the two sections of said other unit, respectively.
12. A support as claimed in any one of the preceding claims 8 to 11, in which the hinged flap means is urged towards the roof supporting mode by ram means.
13. A support as claimed in claim 12, in which the ram means are mounted between the hinged flap means and the base component of said other unit.
14. A support as claimed in any one of the preceding claims, in which a forwardly extensible cantilever device is provided on said one unit.
1 5. An underground mine self-advancing roof support substantially as described herein and substantially shown in the accompanying drawings.
16. An underground mine installation comprising a mine roof support as claimed in any one of the preceding claims.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8017723A GB2077830A (en) | 1980-05-30 | 1980-05-30 | Underground mine self- advancing roof supports |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8017723A GB2077830A (en) | 1980-05-30 | 1980-05-30 | Underground mine self- advancing roof supports |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2077830A true GB2077830A (en) | 1981-12-23 |
Family
ID=10513725
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8017723A Withdrawn GB2077830A (en) | 1980-05-30 | 1980-05-30 | Underground mine self- advancing roof supports |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2077830A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2262494A (en) * | 1991-12-17 | 1993-06-23 | Meco Face End Systems Limited | Mining apparatus. |
| US7331735B2 (en) * | 2004-11-03 | 2008-02-19 | Mckenzie Jefferson D | Apparatus, system, and method for supporting a gate entry for underground full extraction mining |
-
1980
- 1980-05-30 GB GB8017723A patent/GB2077830A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2262494A (en) * | 1991-12-17 | 1993-06-23 | Meco Face End Systems Limited | Mining apparatus. |
| US7331735B2 (en) * | 2004-11-03 | 2008-02-19 | Mckenzie Jefferson D | Apparatus, system, and method for supporting a gate entry for underground full extraction mining |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4065929A (en) | Mine roof support and method in longwall mining of thick mineral seams | |
| CN102472102B (en) | Longwall mining roof supports | |
| CN111561317B (en) | Scraping coal mining method for steeply inclined coal seam | |
| PL91660B1 (en) | ||
| US3856356A (en) | Method of mining mineral | |
| EP0795680B1 (en) | Shortwall mining equipment for extraction of pillars in underground coal mines | |
| GB2077830A (en) | Underground mine self- advancing roof supports | |
| US4505517A (en) | Self-advancing mine roof supports | |
| US3471201A (en) | Mineral mining arrangement including track for a mining machine | |
| US4391470A (en) | Method of, and apparatus for, winning mineral material | |
| US4047761A (en) | Mining machine | |
| US3578809A (en) | Method and apparatus for forming subterranean structures | |
| CA1129661A (en) | Underground mining roof support systems and supports for use with such systems | |
| US4069676A (en) | Mine packing equipment | |
| RU2143068C1 (en) | Tunneling and stoping complex | |
| SU1696723A1 (en) | Powered stoping complex | |
| GB2058895A (en) | Underground Mine Roof Support System and Supports for Use in Such a System | |
| SU911041A1 (en) | Coal coal-winning set | |
| GB2123457A (en) | Excavating machine | |
| WO2014158039A2 (en) | Method of driving drifts and a set of machines for driving drifts | |
| US3987908A (en) | Mining apparatus | |
| GB2035415A (en) | Apparatus for driving an opening as part of mining operations | |
| RU1834974C (en) | Potassium salts mining extracting equipment | |
| GB2108559A (en) | Mine roof supports | |
| US3480130A (en) | Prop and conveyor arrangement for removing loose mineral |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |