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EP0349942B1 - Hydraulischer Stahlgrubenstempel - Google Patents

Hydraulischer Stahlgrubenstempel Download PDF

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Publication number
EP0349942B1
EP0349942B1 EP89112065A EP89112065A EP0349942B1 EP 0349942 B1 EP0349942 B1 EP 0349942B1 EP 89112065 A EP89112065 A EP 89112065A EP 89112065 A EP89112065 A EP 89112065A EP 0349942 B1 EP0349942 B1 EP 0349942B1
Authority
EP
European Patent Office
Prior art keywords
piston
tube
prop
valve
pressure chamber
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
EP89112065A
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German (de)
English (en)
French (fr)
Other versions
EP0349942A1 (de
Inventor
Martha-Catharina Heiliger
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
Priority to AT89112065T priority Critical patent/ATE82616T1/de
Publication of EP0349942A1 publication Critical patent/EP0349942A1/de
Application granted granted Critical
Publication of EP0349942B1 publication Critical patent/EP0349942B1/de
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
    • E21D15/14—Telescopic props
    • E21D15/44—Hydraulic, pneumatic, or hydraulic-pneumatic props

Definitions

  • the invention relates to a hydraulic steel pit ram with a lower ram consisting essentially of an outer cylinder tube with a cylinder base on the one hand and a collar, on the other hand, and an upper ram guided coaxially displaceably in the lower ram by at least one guide ring consisting essentially of a cylinder tube, which on the one hand Piston sealed and guided against the inner wall of the outer cylinder tube and on the other hand has a stamp head, as well as with a setting and pirate valve, an inner extension limit and a return spring, the outer and inner cylinder tubes each with their front ends of corresponding lugs and front grooves of collar or piston on the one hand and stamp head or cylinder base on the other hand is sealed and sealed at least on the piston, stamp head and cylinder base and wherein a tensile forces z between these two components receiving element is provided.
  • a pit stamp of the type described above has become known, for example, from DE-A-26 31 492. Such pit stamps have proven themselves with regard to their functionality. Steel pit stamps per se are known in numerous construction variants. Because of their heavy weight, attempts have already been made to manufacture such pit stamps from light metal. Such pit stamps made of light metal, however, cannot be used wherever there is a risk of striking weather, because light strikes on the light metal pipes can cause sparks, which can then trigger a gas explosion. In addition, such pit stamps made of light metal are also about twice as expensive as corresponding steel pit stamps.
  • an outer cylinder tube is connected to a cylinder base or stamp foot by mechanical means such as clamping sleeves. Near the stamp foot at the bottom of the outer A separate piston, which is supported on the inside of the plunger base, is then provided as a seal. Since this outer cylinder tube serves as a liner for the inner piston of the inner cylinder tube, it is usually machined precisely by drilling out and subsequent grinding or honing. It can also be surface-treated in a manner known per se, for example with cadmium or zinc. In the head area of the outer punch tube, a groove is screwed in in order to hold the collar ring arranged there with a handle via a groove wire which is inserted into the corresponding groove.
  • the flange ring also has the task of forming an extension stop for the inner cylinder tube.
  • a stop sleeve is inserted between the inner cylinder tube and the outer cylinder tube, which is carried along by the piston of the inner cylinder tube during the extension movement.
  • the stop sleeve comes to rest against the stop surface of the collar ring, which in turn represents a second guide for the inner cylinder tube, when the inner cylinder tube is more or less extended, as a result of which it is not possible to extend the inner cylinder tube further.
  • the collar must now absorb the entire axial force generated by the punch and transmit it to the outer cylinder tube via the grooved wire.
  • the outer cylinder tube must be thicker by the depth of the groove than would be necessary for reasons of strength. Since the cylindrical running surfaces also have to be treated galvanically, high-strength steel alloys cannot be used because they become hydrogen embrittled as a result of the galvanic treatment. Since high-strength alloys cannot be used, a correspondingly large wall thickness must be provided due to the load that occurs (pressures of approx. 400 bar occur in the outer cylinder tube), which creates a corresponding weight. It should be borne in mind that the transport and installation of such pit stamps is done exclusively by hand in practice.
  • the inner stop sleeve can easily crust over, making it impossible to push the stamp tubes together.
  • this sleeve moves with the retraction and extension of the inner stamp, damage to the surface protection of the inner surface of the outer stamp is also inevitable.
  • the stamp head of the inner stamp tube and the piston of the inner stamp tube are connected to one another with a tubular hollow body that absorbs tensile forces.
  • a tension spring is arranged in the interior of this tubular hollow body, which connects the stamp head to the stamp base and which, when the pressure is released, retracts the extended inner stamp tube.
  • the object of the invention is to propose a hydraulic steel pit ram of the type described in the introduction, which is cheaper to manufacture and easier to handle. It should be easier to repair and allow cheaper storage. It should also be lighter with the same support force and length and less prone to failure due to dirt. In addition, it should be possible to manufacture it on site in the length required for the respective need.
  • a further tension element arranged coaxially to the cylinder tubes is fastened to the cylinder base and extends as a holding rod through the piston and has a retaining element in the region of the free end, being coaxial a compression spring is arranged as a return spring to the tension element, which is supported on the one hand on the holding element and on the other hand on the element absorbing tensile forces or on the piston or a component connected to the element or the piston and the connection between the setting and pirate valve on the one hand and the pressure chamber on the other hand alternatively via Cylinder base can be done.
  • the construction according to the invention thus has an inner stop which forms the extension limit.
  • the collar arranged on the outer cylinder tube is thus completely load-free in any load situation of the punch and no longer has to serve as a stop, as a result of which the groove for the grooved wire can be omitted, so that the wall thickness of both the inner and the outer cylinder tube can be chosen to be thinner.
  • any welding is also not necessary, high-strength steel alloys can be used, which allow a further reduction in the wall thickness of the inner tube and the outer tube. This is particularly true when there is no need for galvanic coating of the cylinder surfaces, which is possible with such high-strength steel alloys. This is possible in particular because the inner stop sleeve can be dispensed with, so that the risk of scoring is minimized.
  • the wall thicknesses of the cylinder tubes can be kept thinner, which makes the stamp lighter.
  • the stamp tubes are on their respective front ends only placed on corresponding approaches or inserted into corresponding grooves. They are no longer welded there or fastened with a grooved wire, but simply sealed. This sealing can take place, for example, with an inner and, if necessary, an outer O-ring. However, it is preferably carried out with the highly effective liquid seals known today, which cure at room temperature and remain absolutely leak-tight even at the highest pressures. This simple insertion of the cylinder tubes with simple sealing is possible because in the stamps according to the invention, significant tensile loads no longer have to be taken over by the cylinder tubes.
  • the stamp in its individual parts without a cylinder tube and as a cylinder tube, correspondingly pre-processed and if necessary also surface-treated tubes, as long as it is not a galvanic treatment, to be available and / or supplied by the meter. If a steel pit stamp is to be produced for a certain expansion height, then it is only necessary to cut the cylinder tubes, which are available by the meter, to a suitable length, e.g. by sawing them off, deburring them at the saw cuts and simply assembling them with the associated end components and z. B. to seal over the liquid seal.
  • Any welding work or the incorporation of a groove for a grooved wire is not necessary and the associated distortion of the tube or the additional processing and weakening of the tube is avoided. Damage to the treated surface is also avoided. The damage in the cutting area caused by cutting the pipe to length disappears in the seal and is therefore harmless.
  • a steel pit stamp according to Figure 1 is essentially formed by an outer cylinder tube 1, which is inserted with its lower end face in a corresponding end face groove of a cylinder bottom 14 'and sealed there with a liquid seal 5. If necessary, transverse holding screws 23 can be provided as a simple mechanical securing device. However, these cannot and should not transmit any significant mechanical loads.
  • the cylinder bottom 14 ' is in on usually used in a so-called.
  • Stamp base 25 which is fastened, for example, via clamping sleeves, of which only the bores 46 are shown, to the cylinder base 14 '.
  • a collar 16 is placed over a simple centering approach, which can also be divided.
  • This collar 16 has an inner guide ring 12 for an inner cylinder tube 2 and a dirt scraper 17 associated therewith.
  • An inner cylinder tube 2 is guided by this collar ring 16 in the outer cylinder tube 1 so as to be longitudinally displaceable via the guide ring 12 arranged on the collar ring 16.
  • the inner cylinder tube 2 has a piston 9 at its front end. This has a receiving attachment, not designated in more detail, with which it is inserted into the interior of the tube 2.
  • the end face of the cylinder tube 2 comes to rest at the end of the mentioned approach of the piston 9.
  • connection area of the inner cylinder tube 2 with the piston 9 can in turn — preferably by means of a liquid seal — simply be sealed.
  • the piston 9 is guided over a guide ring 12 'and sealed via a piston sealing ring 10.
  • valve housing 24 At the outer end face of the inner cylinder tube 2, this is inserted into an end groove of a valve housing 24, which is not designated in any more detail, and there in turn — preferably sealed with a liquid seal 5-.
  • a setting and robbery valve 21 which is also known per se, is inserted in a manner known per se.
  • the valve housing 24 is also formed in a manner known per se on its upper side so that it can receive a stamp head 4 there, which can be connected in a conventional manner to the valve housing 24 and can be supported on the valve housing 24, so that the supporting force via the Stamp head 4 and the valve housing 24 is transferred into the inner cylinder tube 2.
  • valve housing 24 On the inside of the valve housing 24 there is a bore, not designated in any more detail, which runs coaxially to the longitudinal axis of the steel pit ram, is connected to the bore for the setting valve 21 and is threaded at its end pointing into the interior of the cylinder. Screwed into this thread is a tube 3, which is sealed in this thread area in a manner not shown in such a way that a pressure which builds up inside the tube 3 cannot propagate to the outside thereof.
  • the tube 3 is passed through a correspondingly coaxial and unspecified bore of the piston 9 and connected there via a threaded nut 13, which can be designed as a lock nut or hole nut.
  • the threaded nut 13 is supported with its inner flat surface on the corresponding counter surface of a depression of the piston 9 and is also sealed in this area, so that a pressure building up in the pressure chamber 26 cannot continue in this area to the outside of the tube 3 .
  • the tube 3 has on its inside a stop ring 11 against which a helical compression spring 6 is supported at the end. This spiral compression spring extends into the interior of the tube 3, so that one could also refer to this tube 3 as a spring guide tube.
  • the tube 3 connects the valve housing 24 and thus the punch head 4 to the piston 9, so that tensile forces occurring between these parts are absorbed by the tube 3.
  • the pipe 3 does not absorb pressure forces. Rather, these are taken up by the cylinder tube 2.
  • the spiral compression spring 6 is supported at its second end on a holding element 8 which is arranged at the inner free end of a tension element 7 designed as a rod.
  • the second end of the tension element 7 is passed through a corresponding bore in the cylinder base 14 'through this cylinder base and held securely in this position via a locking ring 47 against pulling out.
  • a seal 48 arranged on the inside ensures that the pressure in the pressure chamber 26 does not continue to the outside at this point can.
  • the valve 21 In the opposite direction, that is, when the punch is to be extended to support the hanging part, the valve 21 is moved into the setting position, so that the pressure medium — generally simple water — from the valve 21 into the interior of the tube 3 and from there into the pressure chamber 26 can flow.
  • the piston 9 and thus the cylinder tube 2 with its outer structures are extended until the stamp head 4 comes to rest.
  • the compression spring 6 moves onto the block, preventing a further extension movement.
  • Tensile loads on the outer cylinder tube 1 or on the collar 16 do not occur.
  • a stop sleeve between the inner cylinder tube 2 and the outer cylinder tube 1 is not required. Corresponding surface damage from such a bushing is avoided.
  • a handle 18 arranged on the outer surface 27 of the outer cylinder tube 1 is divided in a manner not shown but is known per se and can therefore be clamped on the outer surface 27 or moved thereon.
  • the internal structure of the embodiment according to FIG. 2 is almost identical to the embodiment according to FIG. 1. Reference can therefore be made to the previous description of FIG. 1.
  • the valve housing for the valve 21 is formed by a part 18 'of the handle arranged on the outer surface 27 of the outer cylinder tube 1 according to the embodiment of Figure 2.
  • the valve 21 is then connected to a connecting piece 20 via a high-pressure hose 19 connected to the part 18 'in a pressure-tight manner, which is formed as an outer cam on the cylinder base 14.
  • FIG. 3 again shows a stamp which is identical in its essential characteristics to the stamp according to FIG. 1.
  • the piston 9 has a pressure relief valve 15 which is often also referred to as a working valve and which has an inlet via a bore 30 with the pressure chamber 26 and an outlet via a bore 31 with the intermediate space 28 between the outer cylinder tube 1 and inner cylinder tube 2 is connected.
  • the mouth of the bore 31 lies above the piston sealing ring 10, so that unhindered access to the space 28 mentioned is possible.
  • the collar 16 has at least one relief bore 29 which on the one hand opens into the intermediate space 28 and on the other hand leads freely into the ambient air.
  • the pressure relief valve 15 described on the piston 9 ' usually has the function of overloading the plunger retracting the inner cylinder tube 2 by an amount which is suitable for reducing the overload, thereby allowing 15 pressure by means of the pressure relief valve of the pressure medium is reduced by correspondingly releasing the pressure medium from the pressure chamber 26.
  • the special arrangement and connection according to FIG. 3 now makes it possible to discharge the excess pressure of the pressure chamber 26 via the bore 30 through the pressure relief valve 15 and the outlet bore 31 into the intermediate space 28 and thus to flush the water which is usually used as the pressure medium into this intermediate space 28 and so that this space can be washed free of dirt particles at the same time.
  • the water emerging from the bore 31 can then leave the intermediate space 28 via the relief bore 29.
  • This cleaning process can not only occur when the stamp is overloaded, but can be deliberately forced by moving the pressure medium to overpressure. This makes active cleaning of the intermediate space 28 possible for the first time.
  • Figure 4 now shows a stamp with the structure of Figure 2.
  • the pressure relief valve 15 is provided in the same arrangement and function as described for Figure 3.
  • One part is designed as a tube end plate 39 and, like the pistons 9 and 9 ', is connected at the end face to the inner cylinder tube 2 via a seal 5.
  • This tube end plate 39 has a concentric bore with a thread, into which the tube 3 with a corresponding and not closer screwed in designated thread and sealed there.
  • a stop element 40 which serves as the actual piston, is screwed to this tube end plate 39 on the end face facing the pressure chamber 26 by means of screws 49. These screws 49 are of course sealed so that no pressure from the pressure chamber 26 can reach the outside of the tube 3 and thus the interior 38. In principle, this would not be harmful, but would mean that 38 pressure medium, ie usually water, is located in this space, which would unnecessarily increase the total weight.
  • the stop element 40 has a central bore 45 which is slightly smaller in diameter than the inside diameter of the tube 3, so that the spiral compression spring, which is in turn arranged in the tube 3, can be supported with its front end in the region of the central bore 45 on the stop element 40 .
  • the stop element 40 has a depression 41 with a bottom 42.
  • the safety valve 32 is inserted so deep into an unspecified bore in the bottom 42 that it does not protrude beyond the upper edge 43 of the depression 41. This ensures that when the piston 37 rests below on the cylinder bottom 14 ', the corresponding load does not have to be taken up by the safety valve 32.
  • the safety valve 32 is connected to the intermediate space 28 via a bore 33.
  • the bore 33 is guided above a guide ring 12 and a piston sealing ring 10 of the stop element 40 into the intermediate space 28, so that hydraulic fluid can escape unhindered there.
  • the inlet side of the safety valve 32 connected to the pressure chamber 26 is not shown in detail and is provided on the valve itself.
  • the safety valve 32 has a cam 34 for its actuation, which with an unspecified wheel on the outer surface of a traction element designed as a rod or tube 7 ' is present, the safety valve 32 being closed in this system.
  • the tension element 7 ' can in turn be essentially designed in the same way as the tension element 7 according to FIGS. 1 to 4.
  • the spiral compression spring 6 moved onto the block when the plunger was fully extended and thus the tension element 7 loaded with the entire stamp support force on train, such a load on the tension element 7 'and on the spiral compression spring 6 no longer occurs in the embodiment according to FIG.
  • the tension element 7 ' namely has an annular groove 35 which is provided axially in such a position that when the punch is extended so far that the coil compression spring is just before the block position, the cam 34 falls into the annular groove 35 and thus the safety valve 32 opens.
  • the pressure chamber 26 is thereby relieved of pressure and the pressure medium is blown out through the bore 33 into the intermediate space 28 and from there, for example via relief bores 29 in the collar 16. This makes a further extension of the cylinder impossible and the tension element 7 'therefore only has to absorb the tensile load resulting from the relatively low spring force of the spiral compression spring 6.
  • the tension element 7 'as a tube which is inserted with its end face facing the cylinder base 14' into a corresponding depression of the cylinder base 14 'and sealed there. In this area, it can have an internal thread, not specified. In this internal thread is inserted from the outside through the cylinder base 14 'threaded plug 44, which thus holds the tension element 7' axially.
  • the tension element 7 'designed as a tube can also be open on its free end face and have transverse bores 36, so that pressure exerted by the pressure medium of the pressure chamber 26 on the tension element 7' is avoided.
  • the embodiment according to FIG. 6 represents a variant in which the return spring, in contrast to the exemplary embodiments according to FIGS. 1 to 5, is designed as a tension spring.
  • This embodiment corresponds in its essential structure to the structure of the stamp described in FIG. 5. It is in the embodiment of Figure 6 however, instead of the tension element 7 'according to FIG. 5, a tube 51 is used which, like the tension element 7' according to FIG. 5, protrudes through the piston 37 into the tube 3. Except for the spring, the rest of the structure of the device according to FIG. 6 is the same as the structure of the device according to FIG. 5.
  • the return spring in contrast to the exemplary embodiments according to FIGS. 1 to 5
  • FIG. 6 represents a variant in which the return spring, in contrast to the exemplary embodiments according to FIGS. 1 to 5, is designed as a tension spring.
  • This embodiment corresponds in its essential structure to the structure of the stamp described in FIG. 5. It is in the embodiment of Figure 6 however, instead of the tension element 7 'according to FIG. 5,
  • a spiral tension spring 50 is used as the return spring, which extends inside the tubes 3 on the one hand and 51 on the other hand and with it one end is attached in a suitable and known manner to the punch head 4 or to the associated valve housing 24 and with its other end to the threaded plug 44.
  • the spring under tension will contract and thus drive the stamp head 4 and cylinder base 14 'closer to each other, whereby the stamp is retracted in the desired manner in the depressurized state.
  • the tube 51 also serves as a control rod for the safety valve 32. If the plunger is extended to its permissible limit position, the end 52 of the tube 51 is reached by the cam 34 of the safety valve 32, so that the cam Drive out unhindered and can thus open the safety valve 32 in the manner already described. Despite maintaining this function, it is of course possible to make the tube 51 longer if you ensure that an indentation or a groove or a slot is provided at the point 52.

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  • 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)
  • Safety Valves (AREA)
  • Actuator (AREA)
  • Earth Drilling (AREA)
  • Continuous Casting (AREA)
  • Lubricants (AREA)
  • Seasonings (AREA)
  • Medicines Containing Plant Substances (AREA)
  • Lining And Supports For Tunnels (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Reciprocating Pumps (AREA)
  • Sealing Devices (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Heat Treatment Of Steel (AREA)
  • Powder Metallurgy (AREA)
  • Forging (AREA)
EP89112065A 1988-07-04 1989-07-01 Hydraulischer Stahlgrubenstempel Expired - Lifetime EP0349942B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89112065T ATE82616T1 (de) 1988-07-04 1989-07-01 Hydraulischer stahlgrubenstempel.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8808519U 1988-07-04
DE8808519U DE8808519U1 (de) 1988-07-04 1988-07-04 Hydraulischer Stahlgrubenstempel

Publications (2)

Publication Number Publication Date
EP0349942A1 EP0349942A1 (de) 1990-01-10
EP0349942B1 true EP0349942B1 (de) 1992-11-19

Family

ID=6825603

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89112065A Expired - Lifetime EP0349942B1 (de) 1988-07-04 1989-07-01 Hydraulischer Stahlgrubenstempel

Country Status (17)

Country Link
US (1) US5051039A (tr)
EP (1) EP0349942B1 (tr)
JP (1) JPH03500314A (tr)
KR (1) KR900702175A (tr)
AT (1) ATE82616T1 (tr)
AU (1) AU612053B2 (tr)
BG (1) BG51165A3 (tr)
DE (2) DE8808519U1 (tr)
ES (1) ES2036303T3 (tr)
GR (1) GR3006458T3 (tr)
HU (1) HU207143B (tr)
NO (1) NO901014L (tr)
PL (1) PL160886B1 (tr)
RU (1) RU1838622C (tr)
TR (1) TR23904A (tr)
UA (1) UA18636A (tr)
WO (1) WO1990000217A1 (tr)

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JP2660569B2 (ja) * 1989-02-10 1997-10-08 三菱電機株式会社 光磁気記録媒体
DE4015084A1 (de) * 1990-05-11 1991-11-14 Robert Wilhelm Heiliger Verfahren zur herstellung einer kolben-zylinder-einheit sowie kolben-zylinder-einheit hergestellt nach dem verfahren
DE9005343U1 (de) * 1990-05-11 1990-08-30 Heiliger, Robert Wilhelm, 5166 Kreuzau Hydraulischer Stahlgrubenstempel
GB9107940D0 (en) * 1991-04-15 1991-05-29 Lucas Ind Plc Brake servo booster
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US5348425A (en) * 1992-11-10 1994-09-20 Heiliger Robert W Piston cylinder device with a protective coating and method of producing such a coating
DE4323462C2 (de) * 1993-07-14 1995-05-04 Vos Richard Grubenausbau Gmbh Ausbaustempel für den Untertageeinsatz mit integriertem Druckbegrenzungsventil
AU2003200611C1 (en) * 2002-02-22 2005-08-04 Fci Holdings Delaware, Inc. Yieldable prop
US7134810B2 (en) * 2002-02-22 2006-11-14 Jennmar Corporation Yieldable prop having a yield section
AU2004220738B2 (en) * 2002-02-22 2009-04-02 Fci Holdings Delaware, Inc. Yieldable prop having a yield section
WO2003104700A1 (de) * 2002-06-10 2003-12-18 Tracto-Technik Gmbh Vorrichtung zum bewegen eines rohres, rohrverlegungssystem, verfahren zum einbringen eines rohrabschnitts in einen kanal, rohrverlegeverfahren
US6910834B2 (en) * 2003-05-27 2005-06-28 Burrell Mining Products, Inc. Mine prop
CA2436372A1 (en) * 2003-08-04 2005-02-04 Luc Mainville Sealing assembly for a cylinder head
CN100535394C (zh) * 2005-10-31 2009-09-02 中国矿业大学 悬浮式液压支柱
US20120148350A1 (en) * 2010-12-10 2012-06-14 Kenneth Poulson Mine prop jack and method of prestressing a mine prop
CN102606177B (zh) * 2012-03-28 2014-05-14 北京诚田恒业煤矿设备有限公司 一种用于液压支架系统的液压支柱
US8851805B2 (en) 2012-08-30 2014-10-07 Burrell Mining Products, Inc. Telescopic mine roof support
BR102014014086A2 (pt) * 2014-06-10 2016-09-27 Nequir Neto Andrade base pneumática para escoras metálicas
US9903203B2 (en) 2014-08-27 2018-02-27 Burrell Mining Products, Inc. Ventilated mine roof support
US9611738B2 (en) 2014-08-27 2017-04-04 Burrell Mining Products, Inc. Ventilated mine roof support
RU191999U1 (ru) * 2019-02-06 2019-08-29 федеральное государственное бюджетное образовательное учреждение высшего образования "Кузбасский государственный технический университет имени Т.Ф. Горбачева" (КузГТУ) Гидравлическая стойка шахтной крепи
CN112253190B (zh) * 2020-10-22 2022-06-14 白莹 一种高效、高安全性能的煤矿采掘使用液压支柱
WO2024235896A1 (en) 2023-05-12 2024-11-21 Interroll Holding Ag Manufacturing arrangement

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Also Published As

Publication number Publication date
DE58902744D1 (de) 1992-12-24
NO901014D0 (no) 1990-03-02
AU612053B2 (en) 1991-06-27
NO901014L (no) 1990-03-02
EP0349942A1 (de) 1990-01-10
TR23904A (tr) 1990-11-01
UA18636A (uk) 1997-12-25
ES2036303T3 (es) 1993-05-16
HU207143B (en) 1993-03-01
PL160886B1 (en) 1993-04-30
US5051039A (en) 1991-09-24
JPH03500314A (ja) 1991-01-24
AU3842489A (en) 1990-01-23
KR900702175A (ko) 1990-12-06
BG51165A3 (en) 1993-02-15
HUT52840A (en) 1990-08-28
ATE82616T1 (de) 1992-12-15
RU1838622C (ru) 1993-08-30
GR3006458T3 (tr) 1993-06-21
HU893797D0 (en) 1990-07-28
WO1990000217A1 (de) 1990-01-11
DE8808519U1 (de) 1989-11-02

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