US3313211A - Advancing roof supports - Google Patents
Advancing roof supports Download PDFInfo
- Publication number
- US3313211A US3313211A US439026A US43902665A US3313211A US 3313211 A US3313211 A US 3313211A US 439026 A US439026 A US 439026A US 43902665 A US43902665 A US 43902665A US 3313211 A US3313211 A US 3313211A
- Authority
- US
- United States
- Prior art keywords
- valve
- ram
- pressure
- fluid
- unit
- 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 - Lifetime
Links
- 239000012530 fluid Substances 0.000 claims abstract description 48
- 239000003245 coal Substances 0.000 abstract description 2
- 230000002457 bidirectional effect Effects 0.000 description 3
- 230000009977 dual effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
Images
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
-
- 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
- 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
- E21D23/085—Advancing mechanisms forming parts of the roof supports acting on a conveyor or a guide for the mining machine
Definitions
- An object of this invention is to eliminate in an advancing roof support system such as described in our co-pending application Ser. No. 313,625, now Patent No. 3,244,078, the use of a manually operable hydraulic valve which transmits pilot pressure to initiate the operation of an adjacent support and in addition to override the servo-lowering action used in the roof support system disclosed in our United States patent specification No. 3,120,105.
- the present invention provides a control system for a fluid operated advancing mine roof support unit includ ing a unit advancing ram, and a roof support member, comprising first control means adapted to control the lowering of the roof support member in response to pressure conditions appertaining in the ram, and second control means responsive to a predetermined positional setting of the ram and adapted to override the first control means in such manner as to cause the roof support member to reset to its roof supporting position.
- first and second control means are hydraulic valves, the second control valve being adapted to apply further hydraulic fluid from a source of the primary hydraulic fluid used to actuate te first control valve means, to the first control valve means in such sense that said further hydraulic fluid negates the effect of the primary fluid.
- FIGURE 1 shows in diagrammatic form the hydraulic components of a single support unit
- FIGURE 2 shows in diagrammatic form the hydraulic arrangements for operating a number of support units in automatic sequence
- FIGURE 3 shows in diagrammatic form the hydraulic arrangements for producing a bidirectional automatic sequence control of the circuit of FIGURE 2.
- a single support unit shown therein includes a horizontal ram 1 and one or more roof support props 2 of which one only is shown. Fluid power is supplied from a convenient pressure source along a conduit 3 and the fluid return is along a conduit 4. Fluid supply to the annular or pulling side of the ram 1 is controlled by a valve 5 which is urged by a spring into the position shown in the figure. When manually operated, the valve admits fluid from the conduit 3 to the ram causing it to contract and pull the whole support unit forwards against the reaction of any suitable abutment to which the other end of the ram is connected.
- the ram shown in the figure is single-acting only and there is only an atmospheric connection 16 to its blind end to accommodate possible leakage.
- a particular feature of the invention is the provision of the valve 3 which, in the closed position into which it is urged by a spring, prevents the passage of fluid from the pulling side of the ram 1 to the circuit to which the valve 8 is connected.
- the valve 8 is mounted on the support unit in any convenient way such that it is mechanically opened when the piston of the ram 1 reaches the end of its inward travel or any other predetermined point, for example by abutment means 18 carried by the piston of the ram. When the valve 8 is thus opened fluid under pressure from the conduit 3 flows through the valve 5, the valve 8 and the conduit 9 to the alternative pilot operating means it) of the valve 6.
- Pilot operating means 13 is arranged to have a greater effect than the other pilot operating means of the valve, which will still be in operation owing to primary pressure applied via the conduit 7, and thus the advent of this pressure alon" the conduit 9 will reclose the valve 6. Fluid passing through the valve 8 also passes through the nonreturn valve ll and enters the prop 2 setting it against the roof.
- valve 8 is of such construction that fluid flow through it out of conduit 9 is possible even when the valve is in the closed position. This avoids any possibility of fluid being trapped in the pilot operating means ill of the valve 6 preventin reclosure of the latter.
- FIGURE 1 shows only the basic constituents of the circuit and a number of additional features may be optionally added.
- the valve 5 may be a composite valve capable also of controlling the admission of fluid to and its release from the blind end of the ram 1 enabling the ram to be extended by power means if desired.
- the valve 5 may, if desired for safety of the operator, be placed a short distance away from the support unit it controls. It may for example be placed on the adjacent support unit.
- a yield or relief valve may be provided, connected to the point 12 in the circuit, to allow fluid to escape from the prop 2 to atmosphere or to the return conduit 4 in the event of roof convergence taking place.
- a measure of safeguarding against possible failure of any component may be provided by providing two or more sets of the valves 6, 11 and the yield valve if any, each controlling the fluid supply and discharge from a prop or a proportion of the props.
- valve 8 may be replaced by a hole in the side wall of the ram cylinder. This hole is arranged to be in communication with the valve 11 and the conduit 9 and will admit fluid to them when the piston passes it during its operating stroke.
- FIGURES 2 and 3 show the hydraulic arrangements of two roof support units A and B.
- the components and conduits which have been identitled in FIGURE 1 and which appear in FIGURES 2 and 3 have the same reference numerals together with letter suffixes A, B for the units A and B respectively.
- each unit has a horizontal ram (1A and 1B), props (2A and 2B), and valves similar to those shown at 6, 8, 11 in FIGURE 1.
- the units also have valves which differ from those shown in FIGURE 1 however in that means for pilot pressure operation are provided.
- the valve 5A may be operated by the application of pressure to a conduit 13A.
- This pressure may be provided from the pressure supply conduit 3 or any other convenient source under the control of a manually operated valve, a solenoid operated valve to which an electrical signal is applied, or an automatic fluid valve opened by the operation of another support unit or by any other mining operation.
- a manually operated valve a solenoid operated valve to which an electrical signal is applied
- an automatic fluid valve opened by the operation of another support unit or by any other mining operation.
- the valve 68 will not however open releasing the props 2B of unit B from the roof until the pressure in the conduit 7B reaches the value determined by the construction or adjustment of the valve 6B.
- This pressure will ordinarily be a high proportion, for example three-quarters, of the maximum supply pressure available from the source along conduit 3.
- This pressure will also be that applied to the props 2A of the unit A, and it is normally safe and adequate for the ,props of the unit B to be released when such a pressure has been reached in the adjacent support unit.
- the props of the unit B are released from the roof the unit will commence its advancing step.
- the unit B When the unit B has completed its advancing step its props 2B will be reset in the same manner. If desired, the pressure from the conduit 913 may be taken to further support units. Alternatively, electrical or other pressure measuring means may be connected at this point in order to provide remote indication of the successful completion of the support resetting operation.
- valve 5A in FIGURE 2 Manual actuation of the valve 5A in FIGURE 2 will cause operation of unit B as soon as unit A is reset. This may be prevented, if desired, by inserting stop valves in the conduits 13A and 13B. Conveniently, such stop valves may be actuated by the moving part of the valves 5A and 5B. That is to say, if the handle of the valves 5A and 5B is moved in a certain manner, the valves 5A and 5B are operated but the stop valve in the associated conduit 13A or 13B is not, remaining closed. Further movement of the valve handle, however, opens the stop valve as well. Pilot operation of the valve actuates both the associated valve 5A or 53 itself and the stop valve.
- valves and connections are the same as those shown in FIGURE 2 except that dual pilot operation is provided for the valves 5A and 5B.
- pilot pressure operated valves 14 A and 14B are provided for controlling the fluid pressure transmitted from a valve 8A or SE to the valve 5A or 5B of the reset unit A or B to be actuated.
- the valves 14A and 14B are bidirectional and 5A and 5B dual pilot operated. In addition each valve 14A or 14B can be manually controlled.
- valve 143 It also causes operation of the valve 143 in such a way as to cause pressure in the conduit 9B, appearing with the unit B is completing its sequence, to be directed to a subsequent unit to the right in a sequence. If, however, the unit B is the last of a series of units to be operated automatically, the valve 143 is omitted. If desired, there may then be inserted in the conduit 98 means whereby the pressure there may be measured as an indication of the successful completion of an operating sequence.
- a sequence of operations from right to left is initiated by the application of fluid pressure to the conduit 153.
- This causes operation of the valve MB in the opposite sense to that just described and it also causes operation of the valve 58.
- the unit B then operates, on completion of which fluid pressure will appear in the conduit 9B and will pass through the valve 14B to the conduit 15A where it causes operation of the valve 5A and thus of the unit A and operation in the opposite sense to that previously described of the valve 14A.
- the unit A has completed its sequence and fluid pressure appears in the conduit 9A, this will be directed by the valve 14A to the conduit 19 leading to further supports in the series to the left. Altematively, should such operation not be desired the valve 14A is omitted.
- valves 14A and 14B are held by springs in a central position when not operated. In this state, fluid pressure from the conduits 9A and 9B cannot pass through the valves. If, therefore, any unit A or B is operated manually, there will be no fluid pressure in the conduit 13A, 13B, 15A; 153 leading to it. The valve 14A or 143 will then be in its centrar position and pilot operating pressure will not be transmitted to any other unit and no automatic sequence will be initiated. This ensures that automatic sequence cannot be initiated inadvertently when carrying out manual adjustments to a support unit.
- valves 14A and 148 manual operation may be provided on the valves 14A and 148, an automatic sequence may then be initiated from any unit by operating it by means of the manual control of its associated valve 5A or 5B and also by manually placing the valve 14A or 14B in the appropriate position for a transmission of an automatic sequence in the desired direction.
- the manual operating handles of the valves 5A, 53, 14A and 14B may be associated with each other.
- a control system for at least two fluid operated advancing mine roof support units each including a unit advancing ram and a roof support member, wherein each unit comprises a first control means adapted to control the lowering of the associated support member from the roof in response to pressure conditions appertaining in the associated ram and second control means responsive to a predetermined positional setting of the associated ram and adapted to override the associated first control means in such manner as to cause the roof support member to reset to its roof supporting position, and wherein the second control means of a unit is arranged to produce a control signal which serves to initiate the operation of the first control means of the next unit to be advanced.
- each first valve is resiliently biassed into a closed position in which it prevents discharge of fluid from the legs associated therewith, and wherein a fluid pressure characteristic of said pressure conditions, appertaining in the associated ram is arranged to be applied to the first valve in opposition to the force resiliently biassing the valve to its closed position.
- each second control means includes a second fluid flow control valve arranged to control the application of a second fluid pressure to the associated first valve of its unit in such a sense as to act in opposition to the first mentioned fluid pressure applied thereto.
- each second valve is arranged to control the supply of hydraulic fluid from a source thereof to the legs to cause the latter to extend to reset the associated roof support member.
- each third control means has a third fluid flow control valve at a position remote from the unit.
- each support unit sequentially intermediate two support units of a plurality of support units to be operated in a required sequence, is provided with a further control means which is adapted to control the transfer of said control signal to the next unit to be advanced in response to a further control signal derived from the control signal of the previously operated unit.
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)
- Fluid-Pressure Circuits (AREA)
- Actuator (AREA)
- Carriers, Traveling Bodies, And Overhead Traveling Cranes (AREA)
- Press Drives And Press Lines (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB11932/64A GB1098628A (en) | 1964-03-20 | 1964-03-20 | Improvements in or relating to advancing roof supports |
Publications (1)
Publication Number | Publication Date |
---|---|
US3313211A true US3313211A (en) | 1967-04-11 |
Family
ID=9995302
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US439026A Expired - Lifetime US3313211A (en) | 1964-03-20 | 1965-03-11 | Advancing roof supports |
Country Status (5)
Country | Link |
---|---|
US (1) | US3313211A (de) |
DE (2) | DE1205034B (de) |
FR (1) | FR1268264A (de) |
GB (2) | GB967163A (de) |
NL (2) | NL6503406A (de) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1458672B1 (de) * | 1951-01-28 | 1970-02-26 | Becorit Grubenausbau Gmbh | Steuerung für einen wandernden hydraulischen Strebausbau |
DE2901054A1 (de) * | 1979-01-12 | 1980-07-17 | Salzgitter Maschinen Ag | Vorlaeufiger streckenausbau fuer durchbaubetriebe in strecken des untertaegigen bergbaus |
GB2116618B (en) * | 1982-03-06 | 1985-11-20 | Dowty Mining Equipment Ltd | Mine roof supports |
DE202010001750U1 (de) | 2010-02-02 | 2010-06-10 | Karl Hamacher Gmbh | Untertägige Medienversorgungsanordnung |
CN110333017B (zh) * | 2019-07-29 | 2020-12-01 | 宿州市金鼎安全技术股份有限公司 | 一种基于光纤光栅传感器的煤矿巷道顶板应力监测装置 |
CN110778346B (zh) * | 2019-11-15 | 2020-07-03 | 西部黄金伊犁有限责任公司 | 一种用于发生矿井冒顶时的保护装置 |
CN111878140A (zh) * | 2020-06-05 | 2020-11-03 | 范文 | 一种薄煤层开采用液压支架 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1994974A (en) * | 1930-06-21 | 1935-03-19 | Oilgear Co | Differential resistance valve |
US2989950A (en) * | 1958-06-04 | 1961-06-27 | Lockman Nathan | Pneumatic control device |
US3228302A (en) * | 1962-06-07 | 1966-01-11 | Dowty Mining Equipment Ltd | Roof support assembly |
Family Cites Families (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1069548B (de) * | 1959-11-26 | |||
US2714505A (en) * | 1948-05-01 | 1955-08-02 | Joy Mfg Co | Apparatus for mine roof control |
US2657028A (en) * | 1949-06-15 | 1953-10-27 | Joy Mfg Co | Walking jack |
GB735294A (en) * | 1952-03-04 | 1955-08-17 | Bolton & Company Engineers Ltd | Improvements relating to fluid-operated roof-supporting units for use in mines and like places |
GB742850A (en) * | 1952-12-06 | 1956-01-04 | Hydrauliques Pour L Ind Minier | Improved device for supporting the roofs of mine galleries |
GB745679A (en) * | 1953-07-08 | 1956-02-29 | Dowty Auto Units Ltd | Improvements in mine roof supports |
AT184539B (de) * | 1954-04-12 | 1956-01-25 | Kloeckner Bergbau Victor Icker | Wandernder Ausbau mit durch ein Druckmittel betätigten Ausbaugespannen |
GB823128A (en) * | 1955-02-23 | 1959-11-04 | Dowty Mining Equipment Ltd | Improvements in and relating to mine roof support systems |
US2859022A (en) * | 1955-04-04 | 1958-11-04 | Dowty Mining Equipment Ltd | Hydraulic roof supports and conveyor feed jacks |
FR1153880A (fr) * | 1955-04-04 | 1958-03-28 | Dowty Mining Equipment Ltd | Installation et appareil de soutènement hydraulique pour mines |
FR1148920A (fr) * | 1956-03-21 | 1957-12-18 | Commande automatique de mise en marche d'un ou d'étançons automoteurs | |
FR1184882A (fr) * | 1956-10-19 | 1959-07-27 | Eisenwerk Wanheim Gmbh | Soutènement mécanisé à étançons hydrauliques groupés par groupes doubles |
FR1190532A (fr) * | 1957-07-05 | 1959-10-13 | Dobson Ltd W E & F | Perfectionnements apportés aux supports de plafonds pour mines souterraines |
FR1201174A (fr) * | 1957-08-10 | 1959-12-29 | Gewerk Eisenhuette Westfalia | Procédé et dispositif pour la commande d'un soutènement hydraulique, utilisable notamment dans les mines |
DE1131626B (de) * | 1958-04-14 | 1962-06-20 | Kloeckner Werke Ag | Verfahren und Vorrichtung zur Steuerung des Raub- und Setzvorganges von hydraulischen Strebausbaurahmen |
FR1271386A (fr) * | 1959-10-12 | 1961-09-08 | Coal Industry Patents Ltd | Supports du toit des galeries de mines |
FR1337134A (fr) * | 1961-10-30 | 1963-09-06 | Dowty Mining Equipment Ltd | Perfectionnements aux supports de toit de mine |
-
0
- NL NL256189D patent/NL256189A/xx unknown
-
1959
- 1959-09-25 GB GB32684/59A patent/GB967163A/en not_active Expired
-
1960
- 1960-09-17 DE DEC22366A patent/DE1205034B/de active Pending
- 1960-09-24 FR FR839475A patent/FR1268264A/fr not_active Expired
-
1964
- 1964-03-20 GB GB11932/64A patent/GB1098628A/en not_active Expired
-
1965
- 1965-03-11 US US439026A patent/US3313211A/en not_active Expired - Lifetime
- 1965-03-15 DE DE1965C0035321 patent/DE1292605C2/de not_active Expired
- 1965-03-17 NL NL6503406A patent/NL6503406A/xx unknown
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1994974A (en) * | 1930-06-21 | 1935-03-19 | Oilgear Co | Differential resistance valve |
US2989950A (en) * | 1958-06-04 | 1961-06-27 | Lockman Nathan | Pneumatic control device |
US3228302A (en) * | 1962-06-07 | 1966-01-11 | Dowty Mining Equipment Ltd | Roof support assembly |
Also Published As
Publication number | Publication date |
---|---|
NL256189A (de) | |
GB967163A (en) | 1964-08-19 |
GB1098628A (en) | 1968-01-10 |
DE1292605C2 (de) | 1973-05-17 |
DE1205034B (de) | 1965-11-18 |
DE1292605B (de) | 1969-04-17 |
FR1268264A (fr) | 1961-07-28 |
NL6503406A (de) | 1965-09-21 |
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