CA1116423A - Mine roof support system - Google Patents
Mine roof support systemInfo
- Publication number
- CA1116423A CA1116423A CA000347326A CA347326A CA1116423A CA 1116423 A CA1116423 A CA 1116423A CA 000347326 A CA000347326 A CA 000347326A CA 347326 A CA347326 A CA 347326A CA 1116423 A CA1116423 A CA 1116423A
- Authority
- CA
- Canada
- Prior art keywords
- support
- roof
- ram
- adjacent
- advancing
- 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.)
- Expired
Links
- 239000012530 fluid Substances 0.000 claims description 8
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 5
- 239000011707 mineral Substances 0.000 claims description 5
- 238000005065 mining Methods 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
- E21D23/0082—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor specially adapted for vertical or steep gradient seams
-
- 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
- E21D23/0409—Aligning or guiding means for the supports or for the constitutive parts of the supports
-
- 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
- E21D23/081—Advancing mechanisms forming parts of the roof supports
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)
- Control Of Conveyors (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
- Structure Of Belt Conveyors (AREA)
Abstract
PREAMBLE TO DISCLOSURE
Be it known that LEWIS ROBERT BARNES
BOWER of 1, Elmfield Drive, Skelmanthorpe, Huddersfield, W. Yorkshiro, England, having made an invention entitled:-"MINE ROOF SUPPORT SYSTEM"
the following disclosure contains a correct and full description of the invention and of the best mode known to the Inventor of taking advantage of the same.
Abstract of the Disclosure A mine roof support system comprises a plurality of hydraulically powered, self-advancing roof supports located along one side of an armoured conveyor, a double-acting advancing ram connected between a base means of each support and the conveyor, and a double-acting advancing ram extending generally in the intended direction of advance of the support and connected between a rearward end of a roof beam of each support and a forward end of a roof beam of an adjacent support.
Be it known that LEWIS ROBERT BARNES
BOWER of 1, Elmfield Drive, Skelmanthorpe, Huddersfield, W. Yorkshiro, England, having made an invention entitled:-"MINE ROOF SUPPORT SYSTEM"
the following disclosure contains a correct and full description of the invention and of the best mode known to the Inventor of taking advantage of the same.
Abstract of the Disclosure A mine roof support system comprises a plurality of hydraulically powered, self-advancing roof supports located along one side of an armoured conveyor, a double-acting advancing ram connected between a base means of each support and the conveyor, and a double-acting advancing ram extending generally in the intended direction of advance of the support and connected between a rearward end of a roof beam of each support and a forward end of a roof beam of an adjacent support.
Description
This invention relates to a mine roof support system incorporat~ng a pluralit~- of hydraulically poweredJ self-advancing mine roof supports located, in accordance with conventional longwall mining practice, along the goaf side of an armoured conveyor extending along the mineral face.
In the conventional system the supports - are attached to the conveyor by one or more double-acting advancing rams connected between base means of the supports and the individual pans of the conveyor, the ram or rams being actuated in one direction, with the support involved being staked between the mine roof and floor, to advance the individual conveyor pans - in accordance with the rate at which mineral is being removed from the face - and in the reverse direction, with the support involved being retracted, to advance the support to the previously advanced conveyor, the reaction for this movement being taken by the conveyor.
Normally a single central ram is provided in the base means, but the use of two rams mounted outboard of the base means is also known. However, whilst such arrangements have proved generally satisfactory for the weight and dimensions of previous supports e.g. which possibly had a maximum height of 6 to 8 feet, with a demand for supports of say 16 feet and of increased weight, difficulties are encountered during support advance due inter alia to the fact that when a support is being advanced the advancing force on it is applied solely to lts base means which results in a certain instability and secondly the conveyor is often pulled back towards the support rather than the support being pulled forwards to the conveyor. In addition, present trends are towards what is termed ~<contact advance>~ whereby the roof beam is not retracted clear of the roof during advance of the support, but maintains a relatively light, frictional engagement with the roof during advance. Furthermore, when working an inclined mineral seam, it has been known to locate relatively small hydraulic rams between adjacent supports, and at roof beam level, for purposes of positional correction '~
and stability o~ one support with respect to its adjacent support.
According to the present invention, there is provided a mine roof support system comprising a plurality of hydraulically powered, self-advancing roof supports located along one side of an armoured conveyor, a base means and a roof beam incorporated in each of said supports, a double-acting advancing ram connected between said base means of each support and said conveyor, and a double-acting advancing ram, extending generally in the intended direction of advance of said supports and connected between a rearward end of said roof beam of each support and a forward end of said roof beam of an adjacent one of said supports~
Thus, the supports in accordance with the present invention are advanceable by applying advancing 16~l23 forces not only at thelr base means, but also at the roof beams, the advancing support thereby reacting partly on the conveyor and partly on at least one adjacent support, or in a preferred arrangement on the adjacent supports to both sides of the support being advanced, the adjacent support(s) being of course staked in position in accordance with conventional practice after having been previously advanced or before being subsequently advanced.
~ Although separate fluid control 1.
arrangements could be employed to activate the advancing ram associated with the base means (hereinafter referred to as'~ base ram") and the advancing rams associated with the roof beams (hereinafter referred to as "a roof ram"-~, it is preferred to employ a hydraulic system whereby exhaust fluid from a base means ram is fed as pressure fluid to both adjacent roof beam rams, all the rams having the same working.cross-sectional areas.
In detail, during the advancing of a support by admitting pressure fluid to the annulus side of its base ram, the full bore side of its base ram is connected to the full bore side of an adjacent roof ram at one side of the support, and the annulus side of an adjacent roof ram at the other side of the support.
If an inclined seam is being worked, further advantage may be gained by having all the roof beam rams located parallel to one another, the connection at the xearward of one roof beam being downhill from the connection of that same ram to the forward end of the adjacent, uphill support, with this arrangement, the full bore side of each base ram would be connected to the full bore side of an adjacent 9 downhill~
roof ram.
Alternatively, the roof beam rams could be arranged in non-parallel fashion.
The invention will now be described, in greater detail, by way of example, with reference to the accompanying drawingl, which is a diagrammatic plan view of the mine roof support system according to the present invention.
A plurality of hydraulically powered, self-advancing mine roof supports 1 to 5 are arranged side-by-side, in the conventional manner, along an armoured, scraper chain conveyor 6, made up of a plurality of pans articulated together end-to-end, which conveyor 6 extends along a longwall mineral face ~not shown).
Each support 1 to 5 has a forward end 7 adjacent the conveyor 6 and a rearward end 8 remote from the conveyor 6. Each support also includes a plurality of hydraulically extensible chock legs 9, which are indicated in chain dotted line on support 2 only. Each support also has a rectangular base means 10 supporting lower ends of the chock legs 9 and seating on a mine floor 11. Each base means 10 is attached to the conveyor 6 by a double-acting hydraulic ram 12 (the base ram) having a piston rod 13, articulated to a sidewall of the conveyor 6, and a cylinder 14. Thus, each ram 9 has an , . .. . .
annulus side 15 and a full-bore side 16.
A roof beam 17, only portions of which are shown, engages the mine roof (not shown) and is of similar rectangular dimensions as the base means 10, and is carried by the upper ends of the chock legs 9.
A double-acting advancing ram 18, (the roof ram~ extending generally in the intended direction of advance of the supports 1 to 5, is pivotally connected at 19 to a rearward end 8 of the roof beam 17 of one support, and pivotally connected at 20 to a forward end of an adjacent support. Each roof ram 18 has a piston rod 21 and a cylinder 22.
Thus, each roof ram lB has an annulus side 23 and a full-bore side 24.
The full-bore side 16 of each base ram 9 is connected by a conduit 25 to the full-bore side 24 of an adjacent roof ram lB. The annulus side 23 of each roof ram lB is connected by a conduit 26 and through a valve 27, to the annulus side of a roof ram 18 at the other side of the support being advanced. Thus, fluid 4;~3 exhausted from the full bore side of the base ram 9 of a support being advanced, is employed to actuate both roof rams 17 to each side of that support. Further control valves 28 and 29 are also provided on each support for controlling the extension and retraction ~ O~C~ ~ 9, ~ A~L~ .
In the conventional system the supports - are attached to the conveyor by one or more double-acting advancing rams connected between base means of the supports and the individual pans of the conveyor, the ram or rams being actuated in one direction, with the support involved being staked between the mine roof and floor, to advance the individual conveyor pans - in accordance with the rate at which mineral is being removed from the face - and in the reverse direction, with the support involved being retracted, to advance the support to the previously advanced conveyor, the reaction for this movement being taken by the conveyor.
Normally a single central ram is provided in the base means, but the use of two rams mounted outboard of the base means is also known. However, whilst such arrangements have proved generally satisfactory for the weight and dimensions of previous supports e.g. which possibly had a maximum height of 6 to 8 feet, with a demand for supports of say 16 feet and of increased weight, difficulties are encountered during support advance due inter alia to the fact that when a support is being advanced the advancing force on it is applied solely to lts base means which results in a certain instability and secondly the conveyor is often pulled back towards the support rather than the support being pulled forwards to the conveyor. In addition, present trends are towards what is termed ~<contact advance>~ whereby the roof beam is not retracted clear of the roof during advance of the support, but maintains a relatively light, frictional engagement with the roof during advance. Furthermore, when working an inclined mineral seam, it has been known to locate relatively small hydraulic rams between adjacent supports, and at roof beam level, for purposes of positional correction '~
and stability o~ one support with respect to its adjacent support.
According to the present invention, there is provided a mine roof support system comprising a plurality of hydraulically powered, self-advancing roof supports located along one side of an armoured conveyor, a base means and a roof beam incorporated in each of said supports, a double-acting advancing ram connected between said base means of each support and said conveyor, and a double-acting advancing ram, extending generally in the intended direction of advance of said supports and connected between a rearward end of said roof beam of each support and a forward end of said roof beam of an adjacent one of said supports~
Thus, the supports in accordance with the present invention are advanceable by applying advancing 16~l23 forces not only at thelr base means, but also at the roof beams, the advancing support thereby reacting partly on the conveyor and partly on at least one adjacent support, or in a preferred arrangement on the adjacent supports to both sides of the support being advanced, the adjacent support(s) being of course staked in position in accordance with conventional practice after having been previously advanced or before being subsequently advanced.
~ Although separate fluid control 1.
arrangements could be employed to activate the advancing ram associated with the base means (hereinafter referred to as'~ base ram") and the advancing rams associated with the roof beams (hereinafter referred to as "a roof ram"-~, it is preferred to employ a hydraulic system whereby exhaust fluid from a base means ram is fed as pressure fluid to both adjacent roof beam rams, all the rams having the same working.cross-sectional areas.
In detail, during the advancing of a support by admitting pressure fluid to the annulus side of its base ram, the full bore side of its base ram is connected to the full bore side of an adjacent roof ram at one side of the support, and the annulus side of an adjacent roof ram at the other side of the support.
If an inclined seam is being worked, further advantage may be gained by having all the roof beam rams located parallel to one another, the connection at the xearward of one roof beam being downhill from the connection of that same ram to the forward end of the adjacent, uphill support, with this arrangement, the full bore side of each base ram would be connected to the full bore side of an adjacent 9 downhill~
roof ram.
Alternatively, the roof beam rams could be arranged in non-parallel fashion.
The invention will now be described, in greater detail, by way of example, with reference to the accompanying drawingl, which is a diagrammatic plan view of the mine roof support system according to the present invention.
A plurality of hydraulically powered, self-advancing mine roof supports 1 to 5 are arranged side-by-side, in the conventional manner, along an armoured, scraper chain conveyor 6, made up of a plurality of pans articulated together end-to-end, which conveyor 6 extends along a longwall mineral face ~not shown).
Each support 1 to 5 has a forward end 7 adjacent the conveyor 6 and a rearward end 8 remote from the conveyor 6. Each support also includes a plurality of hydraulically extensible chock legs 9, which are indicated in chain dotted line on support 2 only. Each support also has a rectangular base means 10 supporting lower ends of the chock legs 9 and seating on a mine floor 11. Each base means 10 is attached to the conveyor 6 by a double-acting hydraulic ram 12 (the base ram) having a piston rod 13, articulated to a sidewall of the conveyor 6, and a cylinder 14. Thus, each ram 9 has an , . .. . .
annulus side 15 and a full-bore side 16.
A roof beam 17, only portions of which are shown, engages the mine roof (not shown) and is of similar rectangular dimensions as the base means 10, and is carried by the upper ends of the chock legs 9.
A double-acting advancing ram 18, (the roof ram~ extending generally in the intended direction of advance of the supports 1 to 5, is pivotally connected at 19 to a rearward end 8 of the roof beam 17 of one support, and pivotally connected at 20 to a forward end of an adjacent support. Each roof ram 18 has a piston rod 21 and a cylinder 22.
Thus, each roof ram lB has an annulus side 23 and a full-bore side 24.
The full-bore side 16 of each base ram 9 is connected by a conduit 25 to the full-bore side 24 of an adjacent roof ram lB. The annulus side 23 of each roof ram lB is connected by a conduit 26 and through a valve 27, to the annulus side of a roof ram 18 at the other side of the support being advanced. Thus, fluid 4;~3 exhausted from the full bore side of the base ram 9 of a support being advanced, is employed to actuate both roof rams 17 to each side of that support. Further control valves 28 and 29 are also provided on each support for controlling the extension and retraction ~ O~C~ ~ 9, ~ A~L~ .
Claims (7)
1. A mine roof support system comprising a plurality of hydraulically powered, self-advancing roof supports located along one side of an armoured conveyor, a base means and a roof beam incorporated in each of said supports, a double-acting advancing ram connected between said base means of each support and said conveyor, and a double-acting advancing ram, extending generally in the intended direction of advance of said supports and connected between a rearward end of said roof beam of each support and a forward end of said roof beam of an adjacent one of said supports.
2. A system as claimed in Claim 1, wherein separate fluid control arrangements are provided to activate said advancing ram associated with said base means and said advancing rams associated with said roof beams.
3. A system as claimed in Claim 1, wherein a hydraulic system is employed whereby exhaust fluid from a ram associated with said base means is fed as pressure fluid to both of said rams associated with adjacent roof beams, all rams having the same working cross-sectional areas.
4. A system as claimed in Claim 3, wherein the full bore side of said ram associated with said base means of a support being advanced is connected to the full bore side of an adjacent roof ram at one side of said support being advanced, and to the annulus side of an adjacent roof ram at the other side of said support being advanced.
5. A system as claimed in Claim 1, wherein all of said roof beam rams are located parallel to one another.
6. A system as claimed in Claim 1, in circumstances where an inclined mineral seam is involved, wherein connections of said rams associated with said roof beams at said rearward end of said roof beam are downhill from connections of said same rams to said forward end of adjacent, uphill supports.
7. A system as claimed in Claim 6, wherein the full bore side of each ram associated with said base means of each support is connected to the full bore side of said ram associated with said roof beam of an adjacent, downhill, support.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7908500 | 1979-03-10 | ||
| GB7908500 | 1979-03-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1116423A true CA1116423A (en) | 1982-01-19 |
Family
ID=10503789
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000347326A Expired CA1116423A (en) | 1979-03-10 | 1980-03-10 | Mine roof support system |
Country Status (4)
| Country | Link |
|---|---|
| AU (1) | AU5621880A (en) |
| CA (1) | CA1116423A (en) |
| DE (1) | DE3008383A1 (en) |
| ZA (1) | ZA801299B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112253203A (en) * | 2020-10-26 | 2021-01-22 | 山西晟特恒采矿工程机械有限公司 | Onboard platform supporting system for heading machine |
-
1980
- 1980-03-05 DE DE19803008383 patent/DE3008383A1/en not_active Withdrawn
- 1980-03-05 ZA ZA00801299A patent/ZA801299B/en unknown
- 1980-03-06 AU AU56218/80A patent/AU5621880A/en not_active Abandoned
- 1980-03-10 CA CA000347326A patent/CA1116423A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE3008383A1 (en) | 1980-09-25 |
| ZA801299B (en) | 1981-02-25 |
| AU5621880A (en) | 1980-09-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |