US2912211A - Mine prop - Google Patents

Mine prop Download PDF

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Publication number
US2912211A
US2912211A US670538A US67053857A US2912211A US 2912211 A US2912211 A US 2912211A US 670538 A US670538 A US 670538A US 67053857 A US67053857 A US 67053857A US 2912211 A US2912211 A US 2912211A
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US
United States
Prior art keywords
pressure chamber
liquid
pressure
air
lid
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
Application number
US670538A
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English (en)
Inventor
Wilhelm L G Heusner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hermann Schwarz KG
Original Assignee
Hermann Schwarz KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hermann Schwarz KG filed Critical Hermann Schwarz KG
Application granted granted Critical
Publication of US2912211A publication Critical patent/US2912211A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
    • E21D15/50—Component parts or details of props
    • E21D15/51—Component parts or details of props specially adapted to hydraulic, pneumatic, or hydraulic-pneumatic props, e.g. arrangements of relief valves
    • E21D15/512—Arrangement of valves
    • 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
    • E21D23/006—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor provided with essential hydraulic devices
    • E21D23/0069—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor provided with essential hydraulic devices without essential advancing shifting devices

Definitions

  • the said pressure chambers will only during the said operation be under liquid pressure and ;during the remaining time will be empty. If liquid is introduced into the pressure chamber under pressure, the air in said pressure chamber will be compressed accordngly. It is, however, not desired that the pressure chamber in addition to the compressed liquid also contains a cushion of compressed air. The ernployed pressures frequently amount to several hundred 'atmospheres above atmospheric pressure. If the walls of the pressure chamber should tear or burst, considerable explosion-like damages could occur if larger quantities of air under high pressure were enclosed in the pressure chamber.
  • FIG. 1 is a vertical section through the longitudinal axis of a mine prop equipped with the shut-off valve according to the invention.
  • Fig. 2 illustrates on a larger scale than Fig. 1 ⁇ the 'shutoff valve according to the invention in opened position.
  • 'a -Fig. -3 likewise illustrates the shut-oli? valve according tothe invention but in closed position.
  • the shut-oti' ⁇ valve according to the present invention is so designed that it brings about an equalization of the air pressure in the pressure chamber and the atmosphere as long as the pressure chamber is filled with liquid below a certain value or level.
  • the valve automatically efl ectively shuts off communication of the pressure chamber with the atmosphere.
  • the said value or level of the filling of the pressure chamber is so selected that only a relatively minor quantity of air will remain cntrapped in the pressure chamber which even in highly compressed condition will not be dangerous at all if a tear should occur in the walls of the pressure chamber.
  • the employment of the new valve has the further advantage that due to the escape of air during the filling in operation of liquid under pressure, no work will be required for compressing the air which previously remained in the pressure chamber. Thus, considerable amount of energy will be saved.
  • valves for purposes of venting the pressure chamber.
  • These valves have to be actuated manually. Aside from the fact that such manual operation of these valves makes the handling of the mine props more complicated, it also includes a factor of unsafety inasmuch as considerable quantities of compressed air will remain in the pressure chamber if the manually operable valve is closed too early. On the other hand, if t'is closed too late, liquid under pressure will escape which is highly undesirable.
  • valve according to the present invention operates automatically inasmuch as the valve accord- ;ing to the present invention shuts off the compression chamber against the escape of air and liquid under pressure automatically as soon as the compression chamber has been filled with liquid to a certain predetermined extent.
  • Structural arrangem en t designed in any convenient manner, for instance similar "to the type described in U.S. Patent 2,744,717, is desig- 50 ⁇ natecl with the reference numeral 3.
  • the upper mine prop part 1 is designed as cylindrical pres- The interior 4 of sure chamber.
  • a piston "5 which is fixedly connected to the pipe 6 mounted on the lower mine prop part 2.
  • the liquid under pressure is fed into the pipe 6 through a Conduit 15, pipe 6 communicating through a bore 16 with the pressure chamber 4.
  • the piston 5 is furthe rmore equipped with a piston 'seal 7(
  • the pressure chamber 4 is closed by a lid 8 'carrying the mine prop head 17.
  • the lid 8 is provided with' a bore 9 through which a pressure equalization may be eected between the outer air or atmosphere and the pressure chamber 4.
  • the shut-oil valve has the shape of a divingbell.
  • This divingbell 10 is guided in such a way that it can move in the pres sure chamber ⁇ 4 -in the direction of the longitudinalaxis only of said pressure chamber? More spcifica'llw the diving bell 10 is provided with a shank 11 extending into and guided by the bore 9 in the lid 8.
  • a pin 12 extends through the upper end of the shank 11 and is adapted to :1:9 rest on the bottom 19 of a recess 2@ in the lid 8 when the diving bell 10 is not in contact with the pressure liquid in the pressure chamber 4.
  • the diving bell is Suspended in the lid by means of the pin 12.
  • the bottom side of the lid 8 is provided with a truncated cane-like recess the contour of which, substantially conforrns to the outer contour of the diving bell 10.
  • the top surface of the diving bell is provided with a soft seal 13 which when the diving bell is in its uppermost position, engages the bottom portion 14 of the lid 8 which bottom portion forms a valve seat.
  • the diving bell 10 occupies the position shown in Fig. 2, only when pressure liquid is fed into the chamber 4 and has reached a level at which it begins to carry the diving bell, will the diving bell With a further rise of the liquid level be lifted upwardly until the seal 13 engages the valve seat 14. Only at this time, the compression proper of the liquid starts and at the obtainment of a certain high pressure will the upper prop part 1 be lifted into the desired position. The air within the diving bell and in the outer chamber 18 will then be subjected to the pressure prevailing in chamber 4 and its Volume will 'oe accordingly increased to a very small Volume. Inasmuch as the same pressure prevails outside and inside the diving bell, deformations of the diving bell will not be encountered.
  • a shut-off valve having an air vent and also comprising hydraulically operable means operable in response to a predetermined filling of said pressure chamber automatically to close ofif said vent.
  • discharge control means including an air outlet passage arranged at the upper end of said pressure chamber and communicating with the atmosphere, and a valve member normally spaced from said outlet passage so as to allow air to pass from said pressure chamber through said passage into the atmosphere and vice versa, said valve member being designed as a float adapted to be engaged by said actuating liquid in said pressure chamber at a certain level of said actuating liquid and subsequently with increasirg level to he lifted into position for closing said passage prior to the level of said actuating liquid reaching said outlet passage.
  • a valve system comorising a passage extending through said lid for establishing communication between the interior of said pressure chamber and the atmosphere, the lid area facing the interior of said pressure chamber and surrounding said passage forming a valve seat, and a float movable in axial alignment with said valve seat and provided with a sealing surface for engagement with said valve seat to thereby close said passage for interrupting communication between the interior of said pressure chamber and the atmosphere, said scaling surface being normally spaced from said valve seat but being movable to engage said valve seat for closing o said passage in. response to a certain liquid level in said pressure chamber.
  • a valve system comprising a passage through said lid for establishing communication between the interior of said pressure chamber and the atmosphere, and a diving bell provided with a scaling surface and also With a stem eXtending with play through said passage and movably Suspended on said lid to normally suspend said diving bell so that the sealing surface thereof is spaced from that bottom area of said lid which surrounds said passage, said diving bell forming a float adapted to be engaged by actuating liquid n said pressure chamber at a certain level of said liquid in said chamber and subsequently With increasing level of said liquid to be pressed against said bottom area to thereby cause said sealing surface to close said passage.
  • a valve system comprising a passage extending through said lid for establishing communication between the interior of said pressure chamber and the atmosphere, the lid area facing the interior of said pressure chamber and surrounding said passage forming a valve seat, a float movable in aXial alignment with said valve seat, a compressible seal mounted on the outer surface of said float for engagement with said valve seat, said compressible seal normally being spaced from said valve seat but being movable to engage said valve seat for closing off said passage in response to a certain liquid level in said pressure chamber.

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)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Separation By Low-Temperature Treatments (AREA)
  • Self-Closing Valves And Venting Or Aerating Valves (AREA)
  • Actuator (AREA)
US670538A 1956-07-11 1957-07-08 Mine prop Expired - Lifetime US2912211A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DESCH20419A DE1024040B (de) 1956-07-11 1956-07-11 Absperrventil fuer einen mit Fluessigkeit gefuellten Druckraum bei Grubenausbaumitteln

Publications (1)

Publication Number Publication Date
US2912211A true US2912211A (en) 1959-11-10

Family

ID=7428760

Family Applications (1)

Application Number Title Priority Date Filing Date
US670538A Expired - Lifetime US2912211A (en) 1956-07-11 1957-07-08 Mine prop

Country Status (5)

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US (1) US2912211A (en))
BE (1) BE559110A (en))
DE (1) DE1024040B (en))
FR (1) FR1178396A (en))
GB (1) GB852354A (en))

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3166991A (en) * 1961-04-20 1965-01-26 Bochumer Eisen Heintzmann Hydraulically operated mine prop
CN110748366A (zh) * 2019-10-20 2020-02-04 山西晋城无烟煤矿业集团有限责任公司 一种液压阀阀芯磁力安装机构

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB904866A (en) * 1958-06-30 1962-08-29 Dowty Mining Equipment Ltd Improvements in hydraulic props
DE1082212B (de) * 1958-12-31 1960-05-25 Bwg Bergwerk Walzwerk Be- und Entlueftungsventil fuer hydraulische Grubenstempel
DE1231648B (de) * 1960-08-11 1967-01-05 Bochumer Eisen Heintzmann Hydraulisches Ausbauelement, insbesondere fuer den untertaegigen Grubenbetrieb

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR354739A (fr) * 1905-05-25 1905-10-11 Albert Cordebart Appareil pour le gonflement des bandages pneumatiques
US1026471A (en) * 1910-06-13 1912-05-14 George R Siefken Ventilator.
US2247568A (en) * 1938-05-13 1941-07-01 Proportioneers Inc Injection nozzle
GB538377A (en) * 1940-01-30 1941-07-31 Du Pont Manufacture of dyestuffs of the anthraquinone series
US2502158A (en) * 1946-09-27 1950-03-28 Kuskey Rude Backup trap

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE494572A (en)) * 1949-12-08
BE511527A (en)) * 1951-05-21

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR354739A (fr) * 1905-05-25 1905-10-11 Albert Cordebart Appareil pour le gonflement des bandages pneumatiques
US1026471A (en) * 1910-06-13 1912-05-14 George R Siefken Ventilator.
US2247568A (en) * 1938-05-13 1941-07-01 Proportioneers Inc Injection nozzle
GB538377A (en) * 1940-01-30 1941-07-31 Du Pont Manufacture of dyestuffs of the anthraquinone series
US2502158A (en) * 1946-09-27 1950-03-28 Kuskey Rude Backup trap

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3166991A (en) * 1961-04-20 1965-01-26 Bochumer Eisen Heintzmann Hydraulically operated mine prop
CN110748366A (zh) * 2019-10-20 2020-02-04 山西晋城无烟煤矿业集团有限责任公司 一种液压阀阀芯磁力安装机构

Also Published As

Publication number Publication date
GB852354A (en) 1960-10-26
FR1178396A (fr) 1959-05-06
BE559110A (en))
DE1024040B (de) 1958-02-13

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