GB1135942A - Improvements relating to roof supports for mine workings - Google Patents
Improvements relating to roof supports for mine workingsInfo
- Publication number
- GB1135942A GB1135942A GB4974064A GB4974064A GB1135942A GB 1135942 A GB1135942 A GB 1135942A GB 4974064 A GB4974064 A GB 4974064A GB 4974064 A GB4974064 A GB 4974064A GB 1135942 A GB1135942 A GB 1135942A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pressure
- prop
- props
- bars
- roof
- 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
- 230000003245 working effect Effects 0.000 title 1
- 239000012530 fluid Substances 0.000 abstract 1
- 230000036316 preload Effects 0.000 abstract 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
- E21D23/16—Hydraulic or pneumatic features, e.g. circuits, arrangement or adaptation of valves, setting or retracting devices
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)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
1,135,942. Mine roof supports. K. M. GROETSCHEL. 7 March, 1966 [7 Dec., 1964], No. 49740/64. Heading E1E. [Also in Division F1] In a mine roof support comprising a base 71 having a plurality of telescopic hydraulic props 11, 14, 15 and 16 carrying roof-bars 47, one of the props 11 has an intensifier to produce a pressure, higher than the pressure fluid supply, in the prop chamber, the chamber being connected to provide a pressure higher than the setting pressure in at least one other prop. The prop 11 has a hollow piston acting as the cylinder for an inner prop 12 such that the pressure in the inner cylinder is intensified due to the greater area of the hollow piston. The hollow piston supports a yoke 65 supporting the rearward roof bars through posts 67; the rear ends of these bars being supported by the props 14, 15. The forward roof bars 47 are supported by the inner prop piston 12 and, optionally, by the prop 16. The rearward roof bars may have hinged extensions 42 actuated by a wedge and jack mechanism 43, 38. Advancement is provided by twin horizontal jacks within the base 71 coupled to the conveyor 34. In use a distribution valve V5 initially supplies pressure from an inlet 20 to props 12, 14, 15 and 16 until the preload determined by setting load valve V7 is reached. Pressurization of prop 11 to a pressure determined by setting load valve V7 and yield load valve V11, produces a higher pressure within prop 12, which pressure may be fed through selector valve V1 in sequence, or concurrence, to props 14, 15 and 16 to a pressure determined by yield load valve V11. Minimum pressure valves V3, V4 and V6 prevent retraction of all other props should one prop or pipe leak.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB4974064A GB1135942A (en) | 1964-12-07 | 1964-12-07 | Improvements relating to roof supports for mine workings |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB4974064A GB1135942A (en) | 1964-12-07 | 1964-12-07 | Improvements relating to roof supports for mine workings |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1135942A true GB1135942A (en) | 1968-12-11 |
Family
ID=10453385
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB4974064A Expired GB1135942A (en) | 1964-12-07 | 1964-12-07 | Improvements relating to roof supports for mine workings |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1135942A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2455673A2 (en) * | 1979-04-12 | 1980-11-28 | Gewerk Eisenhuette Westfalia | CONTROL DEVICE FOR HYDRAULIC SUPPORT IN THE FORM OF STANDARDS OR THE LIKE |
GB2403762A (en) * | 2003-06-23 | 2005-01-12 | Dbt Gmbh | Hydraulic shield support |
CN100371559C (en) * | 2004-12-10 | 2008-02-27 | 兖州煤业股份有限公司 | Hydraulic supporter for end of widening working face |
CN102926790A (en) * | 2012-12-03 | 2013-02-13 | 山西潞安环保能源开发股份有限公司王庄煤矿 | Inter-support coal-leakage-prevention device of combined-mining hydraulic support |
-
1964
- 1964-12-07 GB GB4974064A patent/GB1135942A/en not_active Expired
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2455673A2 (en) * | 1979-04-12 | 1980-11-28 | Gewerk Eisenhuette Westfalia | CONTROL DEVICE FOR HYDRAULIC SUPPORT IN THE FORM OF STANDARDS OR THE LIKE |
GB2403762A (en) * | 2003-06-23 | 2005-01-12 | Dbt Gmbh | Hydraulic shield support |
GB2403762B (en) * | 2003-06-23 | 2005-06-15 | Dbt Gmbh | Hydraulic shield support |
US7237983B2 (en) | 2003-06-23 | 2007-07-03 | Dbt Gmbh | Hydraulic shield support |
AU2004202506B2 (en) * | 2003-06-23 | 2009-07-16 | Caterpillar Global Mining Europe Gmbh | Hydraulic shield support |
CN100371559C (en) * | 2004-12-10 | 2008-02-27 | 兖州煤业股份有限公司 | Hydraulic supporter for end of widening working face |
CN102926790A (en) * | 2012-12-03 | 2013-02-13 | 山西潞安环保能源开发股份有限公司王庄煤矿 | Inter-support coal-leakage-prevention device of combined-mining hydraulic support |
CN102926790B (en) * | 2012-12-03 | 2014-10-22 | 山西潞安环保能源开发股份有限公司王庄煤矿 | Inter-support coal-leakage-prevention device of combined-mining hydraulic support |
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