US2816728A - Hydraulic pit props - Google Patents

Hydraulic pit props Download PDF

Info

Publication number
US2816728A
US2816728A US15441150A US2816728A US 2816728 A US2816728 A US 2816728A US 15441150 A US15441150 A US 15441150A US 2816728 A US2816728 A US 2816728A
Authority
US
United States
Prior art keywords
prop
pressure
props
valve
check valve
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
Other languages
English (en)
Inventor
Lobbe Armin Dieter
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of US2816728A publication Critical patent/US2816728A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • E21D15/58—Devices for setting props or chocks
    • 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
    • E21D15/002—Auxiliary devices in which the prop type is not essential
    • 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
    • E21D15/14—Telescopic props
    • E21D15/44—Hydraulic, pneumatic, or hydraulic-pneumatic props
    • 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
    • E21D15/517—Extension elements
    • 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
    • E21D15/58—Devices for setting props or chocks
    • E21D15/585—Devices for setting props or chocks by means of hydraulically operated devices for mechanical props, or hydraulic props in which the hydraulic part is not important
    • 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
    • E21D15/58—Devices for setting props or chocks
    • E21D15/585—Devices for setting props or chocks by means of hydraulically operated devices for mechanical props, or hydraulic props in which the hydraulic part is not important
    • E21D15/586—Devices for setting props or chocks by means of hydraulically operated devices for mechanical props, or hydraulic props in which the hydraulic part is not important the props being pre-loaded
    • 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
    • E21D15/60—Devices for withdrawing props or chocks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/87917—Flow path with serial valves and/or closures
    • Y10T137/87925—Separable flow path section, valve or closure in each
    • Y10T137/87965—Valve- or closure-operated by coupling motion

Definitions

  • Known hydraulic pit props comprise a cylinder, which generally acts as the foot of the prop and in which a piston forming the upper portion of the prop is guided. It has already been proposed to connect the prop to a pipe supplying water under pressure and to leave the connection between the pipe and the prop opened during the period the latter is standing. The supporting capacity of the prop is then permanently equal to the piston area multiplied with the pressure in the pipe. If the roof subsides, the prop is shortened, but the supporting capacity is not altered.
  • Hydraulic pit props are also known in which a certain water supply is contained in the prop and is adapted to u be forced underneath the piston by the aid of a high pressure pump arranged on the prop, so that the piston is forced out and pressed against the roof.
  • the placing stress for such props merely depends upon the pressure up to which the water is raised by means of the pump.
  • the problem forming the basis of the present invention is to support the roof of a mine working by hydraulic pit props in such a manner that the placing pressure of all individual props has as far as possible the same value, and particularly that the placing of the individual props in any desired sequence can be carried out without diic'ulty and in the shortest possible time and finally, that the maximum load which can be taken up by the prop is substantially above the placing stress, but can on the other hand be so regulated that deformation or destruction of the prop is avoided.
  • a hydraulic pit prop not only has a check valve through which the pressure medium is introduced from the outside from a pipe and which can be discharged again upon knocking away, but is also provided with an excess pressure or relief valve by means of which the maximum load isy determined.
  • the pressure medium hose used for the lling of the prop conveniently carries a connection member so that it may be coupled with any prop to be erected.
  • a connection member may be made inthe form of a lever so that after having been guided on to the prop by exerting a pressure on its long lever arm, the end of the short arm can be pressed so firmly and tightly against the inlet opening of the prop that the pressure medium can be passed into the prop through the short lever arm without any screwing action being necessary.
  • connection member may be constructed as a tube into which the hose opens.
  • the connecting member advantageously has a valve for controlling the ilow of pressure medium.
  • a further feature of the invention consists in that the prop is provided with a handle above its centre of gravity.
  • the handle conveniently is.so constructed that it can serve simultaneously for the mounting of the filling or robbing means. makes it possible for the prop to beeasily transported, especially in narrow mine galleries.
  • the prop does not have to be carried as a whole, but rather is it intended that that the handle should be grasped in one hand and the prop moved backwards and forwards with the ⁇ foot end sliding on the door. Therefore, only the head weight of the prop has to be raised and the man has his other hand free in order to support himself on the coal face on the conveyor or elsewhere.
  • Fig. 1 is a plan view of a mine working, on a greatly reduced scale
  • Fig. 4 shows the robbing means, also in section.
  • the coat being worked in the mine working is freedV by a plane-like device 11 and automatically loaded onto the conveyor 12, which in turn carries out the cut coal to thedrift conveyor 13.
  • the coal face is free from props.
  • the conveyor 12 is continually displaced towards the coal face 10 over its entire length by the aid of return cylinders (not shown) or in any other suitable manner.
  • the exhausted part of the seam is supported by props 14 arranged in rows which form an angle with the coal face 10 and which are consequently arranged in saw-tooth formation, as will readily be appreciated from the drawing.
  • the setting up of the props in the desired sequence is effected by connecting them, by means of a pressure hose 15, to a pressure medium piping 16 extending alongside the conveyor 12.
  • the piping 16 is provided at certain intervals with coupling points 17 to which the pressure water hose can be' connected.
  • the water under pressure may for example, be supplied from a iloor at a higher level if conditions inthe mine allow of such a possibility. It is, however, also possible in the vicinity of the coal face, to arr-ange a pump 18 operated electrically or byvcompressed air for supplying water under pressure.
  • a check valve 23 for filling the prop upon setting up and for emptying it when the prop is to be knocked away, and secondly an excess pressure valve 24 for setting the maximum load.
  • the valves 23 and 24 are located and are partly protected, between two plates 25 welded on to the lower portion of the prop these plates being connected together by a bolt 26 which is formed as a loop handle lying above the centre vof gravityl of the prop and thus making it possible for the prop to be easily handled.
  • Fig. 3 shows details of the valves 23 and 24 in section.
  • a valve 27 in the form of a ball which is under the action of the spring'28 and is forced against its sea-t by the spring 28 against the pressure of the inowing water under pressure.
  • This water is supplied through the hose 15 from the pressure piping 16 extending alongside the conveyor 12.
  • the hose terminates in a connecting member 30 which is made as a double-armed lever and which, by means of a hook 31, is connected to the transverse bolt 26 of the prop.
  • the longer limb 32 of the connecting member is formed as a tube on to which the hose 15 is connected and which serves as actuating handle.
  • the second lever arm is essentially shorter and contains an outlet opening 33 for the water under pressure which is supplied.
  • the tubular arm 32 is forced further downwards in the direction of arrow 41, so that first of all the ball valve 27 is lifted still further from its seat 29, but at the same time the packing cone 35 bears against and forms a seal with the conically ared surface of the check valve 23.
  • the handle grip 38 isrthen raised in the direction of the arrow 39, the pressure medium flows with great velocity from the pressure piping 16, through the hose 15, the tubular handle 32 and the small outlet tube 33, past the valve body 27 and into the cylinder space 19 of the prop, thereby forcing the piston-shaped upper portion 20 of the prop 14 against the roof with a force corresponding to the hydraulic pressure.
  • the filling of the prop for its erection can take place in a few seconds without any fatiguing pumping work having to be carried out by the men.
  • the prop then supports the roof by a force which is calculated from its piston cross-sectional area and the pressure of the water that is introduced.
  • the prop remains standing in this operative position and the connecting member 30 can be disconnected and employed for setting up another prop.
  • a double-armed lever 46 (Fig. 4) can be used for this purpose.
  • the lever 46 is connected to the bolt or handle 26 of the lower portion 19 by means of a hook 47 and carries on its short lever arm 48 a pressure pin 49 which opens the check valve 23 when a pull is exerted on the longer lever arm 50 in the direction of the arrow 52, for example, by a chain 51.
  • a hydraulic pit prop having a cylinder lmember and a piston :member extendable therefrom, a pressure butt-type hose coupling element defining a fluid passage into said cylinder and defining a contact seat for pressure-tight connection with a pressure hose nozzle pressed in contact therewith, a check valve positioned in said coupling in pressure-tight closure thereof for opening actuation upon pressure of a.
  • a pressure :hose ⁇ nozzle having an elongated rigid discharge nozzle with the end thereof dimensioned for pressuretight connection with the contact seat of said coupling clement upon being pressed in connection contact therewith, a rigid member extending from said nozzle for opening actuation of the check valve in said coupling upon connection contact of said pressure nozzle and said coupling, a short lever arm rigidly connected near the discharge end of said nozzle for pivotal attachment to said fulcrum element, and a prop-robbing device having a exible pulling element having attached to one end thereof means defining a member for insertion into the coupling element of the prop, said member having a hooked lever arm rigidly attached thereto for hooking into pivotal at- 5 tachment to the fulcrum element of the prop, whereby, upon the pulling of said flexible pulling element

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Check Valves (AREA)
  • Press Drives And Press Lines (AREA)
  • Earth Drilling (AREA)
US15441150 1949-04-07 1950-04-06 Hydraulic pit props Expired - Lifetime US2816728A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEP39236A DE830181C (de) 1949-04-07 1949-04-07 Hydraulischer Grubenstempel sowie Vorrichtung zum Setzen und Rauben desselben

Publications (1)

Publication Number Publication Date
US2816728A true US2816728A (en) 1957-12-17

Family

ID=6603986

Family Applications (1)

Application Number Title Priority Date Filing Date
US15441150 Expired - Lifetime US2816728A (en) 1949-04-07 1950-04-06 Hydraulic pit props

Country Status (6)

Country Link
US (1) US2816728A (xx)
BE (1) BE495010A (xx)
DE (1) DE830181C (xx)
FR (2) FR989335A (xx)
GB (1) GB693038A (xx)
NL (2) NL73035C (xx)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3148714A (en) * 1959-09-28 1964-09-15 Dowty Mining Equipment Ltd Liquid charging devices for hydraulic pit props
CN103224205A (zh) * 2013-04-01 2013-07-31 永城煤电控股集团有限公司 手拉葫芦升降装置
US10352167B2 (en) * 2016-11-03 2019-07-16 China University Of Mining And Technology Process method for withdrawing and recovering mechanical constant-resistance single prop
CN114017051A (zh) * 2021-10-11 2022-02-08 煤炭科学研究总院 支架安装车

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1010032B (de) * 1955-02-14 1957-06-13 Dobson Ltd W E & F Abstuetzvorrichtung
DE1043252B (de) * 1956-04-27 1958-11-13 Guenther W Hammer Grundplatte fuer Grubenstempel
US2961839A (en) * 1956-08-28 1960-11-29 Fausto A Aresti Hydraulic compression member
DE1061271B (de) * 1957-11-15 1959-07-16 Tecalemit Ges M B H Deutsche Fuellarmatur fuer hydraulische Grubenstempel

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1208162A (en) * 1915-03-25 1916-12-12 Henry Jungjohann Pressure-recording valve.
US1544777A (en) * 1923-12-10 1925-07-07 Harry B Robinson Air coupling for pipe and hose lines
DE574822C (de) * 1931-04-19 1933-04-20 Dorstener Drahtwerke H W Brune Nachgiebiger Grubenstempel
GB453560A (en) * 1935-05-27 1936-09-14 Wilhelm Fehlemann Yieldable prop for mines
US2247843A (en) * 1937-01-18 1941-07-01 Italiana Magneti Marelli Socie Conduit coupling
US2474464A (en) * 1947-04-24 1949-06-28 Cable Richard George Pit prop and the like
GB636568A (en) * 1953-07-20 1950-05-03 George Herbert Dowty Improvements in pit props and other telescopic struts

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1208162A (en) * 1915-03-25 1916-12-12 Henry Jungjohann Pressure-recording valve.
US1544777A (en) * 1923-12-10 1925-07-07 Harry B Robinson Air coupling for pipe and hose lines
DE574822C (de) * 1931-04-19 1933-04-20 Dorstener Drahtwerke H W Brune Nachgiebiger Grubenstempel
GB453560A (en) * 1935-05-27 1936-09-14 Wilhelm Fehlemann Yieldable prop for mines
US2247843A (en) * 1937-01-18 1941-07-01 Italiana Magneti Marelli Socie Conduit coupling
US2474464A (en) * 1947-04-24 1949-06-28 Cable Richard George Pit prop and the like
GB636568A (en) * 1953-07-20 1950-05-03 George Herbert Dowty Improvements in pit props and other telescopic struts

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3148714A (en) * 1959-09-28 1964-09-15 Dowty Mining Equipment Ltd Liquid charging devices for hydraulic pit props
CN103224205A (zh) * 2013-04-01 2013-07-31 永城煤电控股集团有限公司 手拉葫芦升降装置
CN103224205B (zh) * 2013-04-01 2015-09-23 永城煤电控股集团有限公司 手拉葫芦升降装置
US10352167B2 (en) * 2016-11-03 2019-07-16 China University Of Mining And Technology Process method for withdrawing and recovering mechanical constant-resistance single prop
CN114017051A (zh) * 2021-10-11 2022-02-08 煤炭科学研究总院 支架安装车
CN114017051B (zh) * 2021-10-11 2023-10-20 煤炭科学研究总院有限公司 支架安装车

Also Published As

Publication number Publication date
NL73035C (xx) 1953-08-15
FR989335A (fr) 1951-09-11
NL152226B (nl)
BE495010A (xx) 1950-08-01
GB693038A (en) 1953-06-24
DE830181C (de) 1952-03-27
FR59692E (fr) 1954-06-29

Similar Documents

Publication Publication Date Title
US2816728A (en) Hydraulic pit props
KR0181469B1 (ko) 관을 뒤집는 장치와 같은 것을 사용하는 방법
US2772010A (en) Storage tank trailer
NO317803B1 (no) Fremgangsmate og flerbruksanordning for pafylling og sirkulering av fluid i et borehulls fôringsror
US3271801A (en) Dockboard
US2646793A (en) Self-locking and unlocking pivot joint for leg braces
CN105937407A (zh) 一种沿空留巷混凝土充填墙环形气囊的施工方法
WO2023082930A1 (zh) 一种闸门自动充气堵漏装置及其操作方法
CN207813560U (zh) 煤层水力膨胀式封孔器
US4269544A (en) In situ pile forming apparatus
CN112955626B (zh) 用于将液体供应到内衬的方法和装置
US3469298A (en) Pipe pulling apparatus
US1528857A (en) Pneumatic jack
US3233868A (en) Hydraulically operated well pipe extracting apparatus
US2749175A (en) Latch control for dump trucks
US2501237A (en) Sand flusher
CZ75493A3 (en) Hydraulic prop with filling and releasing valve and a return line of pressure liquid
GB2211223A (en) Lining shafts
US2205508A (en) Scraper
US2849963A (en) Gas or pneumatically actuated deep well pump
US2786695A (en) Hitch means with resiliently loaded extensible strut
US2310001A (en) Apparatus for cleaning holes
US1945943A (en) Hydraulic setting tool
US2757536A (en) Tension machine
US2739719A (en) Hydraulic bag loader for vehicles