GB2031495A - Dust shields for mine roof supports - Google Patents
Dust shields for mine roof supports Download PDFInfo
- Publication number
- GB2031495A GB2031495A GB7931639A GB7931639A GB2031495A GB 2031495 A GB2031495 A GB 2031495A GB 7931639 A GB7931639 A GB 7931639A GB 7931639 A GB7931639 A GB 7931639A GB 2031495 A GB2031495 A GB 2031495A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sealing device
- dust sealing
- coalface
- support system
- dust
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000000428 dust Substances 0.000 title claims abstract description 62
- 238000007789 sealing Methods 0.000 claims abstract description 54
- 210000000078 claw Anatomy 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 238000007665 sagging Methods 0.000 claims description 3
- 230000002250 progressing effect Effects 0.000 claims description 2
- 230000035515 penetration Effects 0.000 abstract description 2
- 238000012986 modification Methods 0.000 abstract 1
- 230000004048 modification Effects 0.000 abstract 1
- 238000010276 construction Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000000266 injurious effect Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007921 spray Substances 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
- E21D23/03—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor having protective means, e.g. shields, for preventing or impeding entry of loose material into the working space or support
-
- 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
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)
- Auxiliary Methods And Devices For Loading And Unloading (AREA)
Abstract
A dust sealing device for a coalface support system, which prevents the penetration of rubble and dust into the coalface compartment by closing the gap between roof bars (72) and between goaf shields (73) of juxtaposed support units (A & B). The device comprises two channels formed by flexible flaps 1, 11 attached beneath the roof bars (72) and to the inner faces of the goaf shields (73), and rail mounting means (3) with end stops (4) for allowing the flaps 1, 11 to slide in a direction parallel to the longitudinal axis of the support units. The spacing between adjacent support units (A & B) is maintained constant by pivotal arms 41, 42 connecting them without impeding other relative movements. To ensure that both sides of the channel forming flaps 1, 11 slide together their edges may be linked by a diagonal bar, Figs. 11, 12 (not shown), or by pivoted links, Figs. 13, 14 (not shown). Various modifications to the face and attachment of the flaps are described, Figs. 4 to 10 (not shown). <IMAGE>
Description
SPECIFICATION
Coalface support systems
The invention relates to a coalface support system with a dust sealing device which is slidable in the direction of the transverse axis and closes the gap between the caps and the fall shields of the slidably juxtaposed support units during progressing and standstill.
In long face mining the support units constituting the coalface support system are erected juxtaposed in a row. They are moved forward alternately according to the progress of clearance, whilst the advancing support unit or the shield block is braced against the adjacent support unit. In the case of the known coalface support method, and more particularly the shield support method, the caps and the fall shields are provided with large-surfaced side plates on both sides so that the support units are permanently in mutual lateral frictional contact and the interstice between them is largely covered. The side plates are intended primarily to prevent the penetration of rubble and dust into the coalface compartment.They also serve additionally as spacing elements and guide means for the adjacent support unit which can be braced against said side plates in the region of the cap or of the fall shield. In order to ensure the necessary permanent frictional contact, said side plates are made laterally adjustable by means of hydraulic cylinders. The side plates themselves are generally constructed as angle plates.
It is a disadvantage of this system that, particularly when one of the two adjacent support units is moved forward, the tailings penetrate between the side plates acting as dust sealing means and are then ground, but finally fall into the coalface compartment and lead to an unpleasant dust nuisance. Furthermore, where the support units are skewed or where the interval between them is not accurately adhered to, said dust sealing means cannot seal the entire gap considered along its total length, so that even large-diameter tailing particles penetrate into the coalface compartment. These dust sealing means are also unsuitable as spacing devices, because they operate under only compressive load.
The underlying aim of the invention is to develop a dust sealing means for coalface support which effectively catches the dust and tailings penetrating through the gap between the individual support units and prevents them from penetrating into the coalface compartment.
This aim is achieved according to the invention in that the dust sealing means sagging in gutter-shape between the support units is arranged slidably parallel to the longitudinal axis of the support units beneath the caps and on the inside of the fall shields.
It is achieved by the invention that the support unit itself is left with sufficient freedom of movement with no need to fear that the gap can no longer be closed by the already extended dust sealing device. It is accepted that part of the tailings particles penetrate through the gap. They are caught with the aid of the dust sealing device according to the invention and discharged so reliably that they cannot penetrate into the actual coalface compartment. This prevents the hitherto disadvantageous grinding effect between the dust sealing devices loaded in compression, so that the disadvantageous fine dust which is injurious to the health is no longer generated artificially by the dust sealing device. The stepping process of the actual support units is not prevented by the dust sealing device, because the latter is arranged slidably on the support units.Thus the dust sealing device is so movable, both in the longitudinal direction and also, by virtue of its sag, in the transverse direction, that it is impossible for the support units to be obstructed.
According to the invention, the transverse mobility is further increased and a simple realisation of the longitudinal sliding mobility is obtained in that the dust sealing device consisting of flexible material is gripped at the longitudinal edges by upwardly open claws which grip the bottom flange of a guide rail constructed as a double tee profile.
When the support units are advanced the dust sealing device must also be displaced with them. In order to ensure this, it is provided according to the invention that the guide rail exhibits stops. With the aid of the stops acting as drivers, it is achieved in simple manner that the dust sealing device is entrained by the support unit each time it is advanced.
The sliding down of the tailing particles which have fallen into the dust sealing device suspended in gutter-shape is advantageously achieved in that the dust sealing device is suspended between the caps with a gradient towards the fall shield. For a further improvement, a spray or nozzle arrangement may be provided at the apex of the cap, through which the tailings lying in the dust sealing device are flushed away with the aid of water or compressed air.
A synchronous sliding of both sides of the dust sealing device is ensured according to the invention in that the front end of the dust sealing device on one side is connected to the rear end on the other side by a diagonal rod.
Such a simple device acts as a synchronising mechanism with simple mechanical auxiliary means.
In a similar manner synchronism can also be ensured in the region of the fall shield by arranging at one end of the dust sealing device mutually connected links, the axes of which point in the advance direction and which are coupled to the dust sealing device by an articulated joint.
An excessive separation of the mutually juxtaposed and slidably arranged support units, and hence damage to the dust sealing device, is prevented according to the invention in that a pendulum co-operating with the dust sealing device is arranged articulately on the support unit, is braced slidingly on the adjacent support unit and has its axis of articulation arranged at right angles to the advance direction. In this context it is particularly convenient to use a pendulum fixed articulately to the other support unit as bracing means, whilst the points of articulation of the two pendulums are arranged mutually staggered and one of the two articulation points is movable by a sliding device. In this way jamming situations are avoided so that the pendulums do not obstruct or intersect each other either in the basic position or during the advancing operation.Unintentional variations in the mutual interval of the support units can be effectively prevented with this device. But when variations of the interval between the support units are necessary one can be achieved by the adjusting device, in which case said greater interval is then maintained and ensured by the pendulums.
Further particulars and advantages of the invention will emerge from the description given hereinbelow of the accompanying drawings, in which a number of exemplary embodiments of the invention are explained in detail, and wherein:
Figure 1 shows a shield support system in side elevation,
Figure 2 shows two support units of a shield support system in elevation,
Figure 3shows a cap with articulated fall shield in side elevation,
Figure 4 shows two caps with a dust sealing device in section,
Figure 5, Figure 6, Figure 7, Figure 8,
Figure 9, Figure 10 each show two caps with different constructions of the dust sealing device in section,
Figure 11 shows a cap with dust sealing device and synchronous coupling in side elevation,
Figure 12 shows the device according to
Fig. 11 in section,
Figure 13 shows a cap in side elevation with dust sealing device and synchronous coupling and
Figure 14 shows the device according to
Fig. 1 3 in section.
The dust sealing device according to the invention is particularly convenient for use with a shield support system which is illustrated in Figs. 1 and 2. The dust sealing device designated 1 and 11 is attached to the cap 72 and to the fall shield 73. Cap 72 and fall shield 73 are braced against the bottom frame 71 by means of the rocker arms 74 and 75 and of the ram 85. The dust sealing device 1, 11 is realised, as may be seen from
Fig. 2, as a part sagging in gutter-shape which declines towards the fall shield and is suspended by claws 2, 22 on the cap 72 and on the fall shield 73 with sliding mobility in the longitudinal direction-i.e., in the advance direction R. The ends of the guide rails 3 exhibit a stop 4 which ensures entrainment of the dust sealing devices. The claws 2, 22 each embrace the bottom flange 5 of the guide rail 3.The guide rail 3 is fixed beneath the cap 72 and on the inside of the fall shield 73.
The gutter-shaped construction of the dust sealing device 1 may be seen more particularly from Fig. 2, this construction being assisted by the use of elastic foil or of a conveyor belt of rubber or PVC.
Due to the inclination towards the fall shield 73, the dust 10 which has fallen through the gap onto the dust sealing device 1, 11 can easily slide down so that it can be caught and discharged by the dust sealing device 11 or the chute 20. The air or water flushing means 9 shown in Fig. 3 is provided to assist this.
The dust sealing device 1, 11 can now be constructed in different ways, and different embodiments are illustrated herein Figs. 4 to 10, whilst the dust sealing device may be constituted e.g., by the parts 12, 1 3 and 1 or a gutter 14 shaped from sheet metal which is pivotable on the support unit B and has a pressure spring 15, or it may have an agitator 21 by which the sliding down of the dust 10 is improved. The embodiment shown in Fig. 7 has additionally the compression spring 1 6 which ensures a satisfactory reciprocating movement of the dust sealing device 1.
By means of the synchronising device according to Figs. 11 to 14 it is ensured that during sliding both sides of the dust sealing device 1, 11 are slid in mutual synchronism, so that no longitudinal deformation of the material occurs. Fig. 11 shows in side elevation, and Fig. 12 in elevation, a synchronising device constructed as a diagonal bar 25, whilst the diagonal bar 25 extends from the front end 26 of the one side to the rear end 27 of the other side of the dust sealing device 1, 11. By means of said diagonal bar, synchronism of the two sides of the dust sealing device 1, 11 is ensured, so that a reciprocal mobility of the mutually adjacent support units A, B exists in all three necessary directions, namely in the advance direction R, in the vertical and in the lateral direction.
The same purpose is also fulfilled by the multi-partite hinge connection according to
Fig. 13 and 14, which is constituted by at least two links 29 placed mutually at an angle, which connects together articulately the two sides with the dust sealing device 1, 11, whilst their articulation axes point in the sliding direction of the dust sealing device 1, 11.
The articulate connection is achieved by the articulated joint designated 30 and consisting of individual bars.
The mutual synchronism of the support units A, B, and hence the protection of the dust sealing device 1, 11 from tearing etc., is served by the device shown more particularly in Fig. 2 with the pendulums 41, 42.
The pendulum 41 is attached pivotably to the cap 72 of the support unit B at the articulation point 48 and the pendulum 42 is arranged on the fall shield 73 of the adjacent support unit A at the articulation point 49.
The two pendulums 41, 42 are connected articulately together at the common articulation point 47. The axes of articulation are oriented at right angles to the advance direction R of the support units. The two articulation axes 48, 49 are arranged mutually staggered so that they cannot overlap either in the basic position or during the advance operation or in the case of height variations of one of the two support units A, B. Thus jamming situations which may impair the function are avoided. The pendulum 41 describes substantially a horizontal orbit 88 and the pendulum 42 a vertical orbit 89. The freedom of movement of the support units both in the advance direction R and vertically is obtained without the possibility of the support units moving farther away from each other laterally than is prescribed.
Deliberate variations in the interval of the mutually adjacent support units A, B can be performed by actuating the hydraulic cylinder 44 in order to modify the position of the sliding device 43. By this means the articulation point 49 of the pendulum 42 is slid into its articulation axis.
In the region of the bottom frames 71 the guidance of the support units is effected by the beam 53 which is laid parallel between the coalface conveyor 51 and a rear distance beam 54.
Claims (11)
1. Coalface support system with a dust sealing device which is slidable in the direction of the transverse axis and closes the gap between the caps and the fall shields of the slidably juxtaposed support units during progressing and standstill, characterised in that the dust sealing device (1, 11) sagging in guttershape between the support units (A, B) is arranged slidably parallel to the longitudinal axis of the support units beneath the caps (72) and on the inside of the fall shields (73).
2. Coalface support system according to
Claim 1, characterised in that the dust sealing device (1, 11) consisting of flexible material is gripped at the longitudinal edges by upwardly open claws (2, 22) which embrace the bottom flange (5) of a guide rail (3) constructed as a double tee profile.
3. Coalface support system according to
Claim 1 and Claim 2, characterised in that the guide rail (3) exhibits stops (4).
4. Coalface support system according to
Claim 1 and Claim 2, characterised in that the dust sealing device (1, 11) is suspended between the caps (72) with a gradient towards the fall shield (73).
5. Coalface support system according to
Claim 1 and Claim 2, characterised in that the front end (26) of the dust sealing device (1, 11) on one side is connected to the rear end (27) on the other side by a diagonal bar (25).
6. Coalface support system according to
Claim 1 and Claim 2, characterised in that at one end (26, 27) of the dust sealing device (1, 11) there are arranged mutually attached links (29), the axes of which point in the advance direction (R) and which are coupled to the dust sealing device by an articulated joint (30).
7. Coalface support system according to
Claim 1, characterised in that a pendulum (42) co-operating with the dust sealing device (1, 11) is arranged articulately on the coalface support unit (A), is braced slidingly on the adjacent support unit (B) and its axis of articulation is made at a right angle to the advance direction (R).
8. Coalface support system according to
Claim 7, characterised in that the pendulum (42) is braced against a pendulum (41) attached articulately to the support unit (B), whilst the articulation points (48, 49) of the two pendulums are arranged mutually staggered.
9. Coalface support system according to
Claim 7 and Claim 8, characterised in that a sliding device (43, 44) is associated with the articulation point (49).
1 0. A coalface support system substantially as hereinbefore described with reference to the accompanying drawings.
11. A dust sealing device substantially as hereinbefore described with reference to the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7931639A GB2031495B (en) | 1978-09-13 | 1979-09-12 | Ust shields for mine roof supports |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7836607 | 1978-09-13 | ||
| GB7931639A GB2031495B (en) | 1978-09-13 | 1979-09-12 | Ust shields for mine roof supports |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2031495A true GB2031495A (en) | 1980-04-23 |
| GB2031495B GB2031495B (en) | 1982-07-14 |
Family
ID=26268833
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7931639A Expired GB2031495B (en) | 1978-09-13 | 1979-09-12 | Ust shields for mine roof supports |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2031495B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2503788A1 (en) * | 1981-04-09 | 1982-10-15 | Uholne A Lignitove Bane Koncer | SUPPORT UNIT FOR OPERATION BY BENCHES OR WITH CUT TO THE ROOF OF A COAL LAYER OR OTHER ORE |
| CN113494308A (en) * | 2021-08-20 | 2021-10-12 | 中煤科工集团重庆研究院有限公司 | Torsion spring type dust collecting and guiding method and device |
-
1979
- 1979-09-12 GB GB7931639A patent/GB2031495B/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2503788A1 (en) * | 1981-04-09 | 1982-10-15 | Uholne A Lignitove Bane Koncer | SUPPORT UNIT FOR OPERATION BY BENCHES OR WITH CUT TO THE ROOF OF A COAL LAYER OR OTHER ORE |
| CN113494308A (en) * | 2021-08-20 | 2021-10-12 | 中煤科工集团重庆研究院有限公司 | Torsion spring type dust collecting and guiding method and device |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2031495B (en) | 1982-07-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |