EP0491882A1 - Mehrstufiger hydraulischer grubenstempel. - Google Patents
Mehrstufiger hydraulischer grubenstempel.Info
- Publication number
- EP0491882A1 EP0491882A1 EP91905621A EP91905621A EP0491882A1 EP 0491882 A1 EP0491882 A1 EP 0491882A1 EP 91905621 A EP91905621 A EP 91905621A EP 91905621 A EP91905621 A EP 91905621A EP 0491882 A1 EP0491882 A1 EP 0491882A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tube
- intermediate tube
- stamp
- pit
- foot
- 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.)
- Granted
Links
- 230000007797 corrosion Effects 0.000 claims description 6
- 238000005260 corrosion Methods 0.000 claims description 6
- 239000007769 metal material Substances 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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 multi-stage hydraulic pit ram consisting of an outer tube provided with a ram foot, a central piston rod provided with a ram head, an intermediate tube provided with a bottom and guide bushes arranged at the head end of the outer and inner tubes.
- the expansion shields, teams and similar devices used in the step-by-step expansion are equipped with multi-stage hydraulic pit punches.
- the intermediate tube and the piston rod are inserted from the head end into the outer tube closed by the stamp foot, a guide bushing limiting the stroke being screwed onto the head end of the outer and intermediate tube.
- technical development has led to a larger number of stamp types being used in the mines for the various expansion devices. B. differ only by the tube diameter, the design of the guide bushes, the design of the stamping foot or head, but the distinctions require extensive storage of spare parts and make the repair service considerably more difficult and expensive.
- the punches After a relatively short period of operation, the punches show corrosion damage and leaks on the sliding surfaces of the outer and intermediate tubes. To eliminate them, it is customary to hon the sliding surfaces. For this, the stamps must be taken apart by the Guide bushes, unscrewed and the intermediate tube and d piston rod are pulled out of the outer or intermediate tube towards the head end. Often, however, the screw connections of the guide bushes are so badly corroded or jammed by mechanical loading that the guide bushings cannot be loosened. Another night also consists in the fact that the outer or inner tube, which is closed by the stamping foot or the bottom, cannot be worked up to the end of the cylinder bore with the usual honing tools and there are steps that limit the stroke. With different stamp types, the outer and intermediate tube also have such a small wall thickness that honing is not possible for reasons of strength.
- the invention has for its object to e e multi-stage hydraulic pit stamp with a d preamble »of claim 1 corresponding structure dera that it can be easily adapted to d different connecting elements of the various expansion devices and the repair possibilities is significantly improved .
- the new pit stamp initially has the advantage that the stamp foot and the stamp head are interchangeable.
- the Ste pel is adaptable to the various expansion facilities available in the mine by selecting the appropriate punch or head for the connecting element of the expansion facility concerned and fastening it to the outer tube or piston head b. Instead of complete, for the mine stamps intended for expansion equipment, the corresponding stamp feet and heads need to be kept in stock.
- the releasable attachment of the base of the base v intermediate tube and the stamp head still has the Vo partly that the components can be pulled out of the outer tube or intermediate tube for dismantling for repair purposes and that no unscrewable guide bushings exposed to the risk of mechanical damage and corrosion are required.
- the sliding surface of the outer and intermediate tubes can also be honed from the bottom opening, so that step formation is avoided.
- the releasable connection of the stamp foot, the base and the stamp head can be designed in various ways.
- the stamping foot can be screwed onto the outer tube.
- An alternative type of fastening is to provide the step foot and the outer tube with an annular groove, both annular grooves in the covering state forming a common annular channel through which a wire pin is guided which connects the two components.
- a welded joint that can be tapped for repair purposes is also possible.
- the bottom is expediently screwed into the intermediate tube, and either a conical or a cylindrical screw connection can be selected.
- a conical or a cylindrical screw connection can be used for the stamp head for screwing into the head end of the piston rod. Weldable connections that can be detached by parting off are also conceivable for the intermediate tube and the punch head.
- the guide bushes of the outer and intermediate pipe are either formed by machining the pipe or a correspondingly shaped socket part is welded onto the front end of the pipe, so that in both cases the guide bush is a direct component of the outer or intermediate pipe , that is, inextricably linked to them.
- the guide bushings of the outer and intermediate pipe are expediently coated with a corrosion-resistant metallic material. Ring grooves for guide rings and wiper rings are also provided in the guide bush.
- the partially cut multi-part hydraulic pit punch shown in Fig. 1 consists essentially of an outer tube 1, an intermediate tube 2 and a piston rod 3.
- the outer tube is provided with a releasable stamping foot, while the intermediate tube 2 has a releasable bottom.
- the piston rod 3 is provided with a detachable pel head 6.
- the plunger foot 4 is provided with a collar 7, which can be screwed onto the outer tube 1 by means of a conical thread 8 a.
- a conical thread 8 a By a small Ve rotation, if necessary with the help of a blow, the conical thread 8 can be loosened relatively easily, even if it is corroded.
- the bottom is fastened in the intermediate tube 2 in a similar manner.
- This bottom 5 is formed in conjunction with a collar 9 as a piston for the intermediate tube.
- the collar 9 is screwed onto the lower end of the intermediate tube 2 by means of a conical thread 10.
- the punch head 6 is screwed into the upper end of the piston rod 3 by means of a conical thread.
- a guide bushing 12 and 13 is attached at the top of the outer tube 1 and the intermediate tube 2.
- the two guide bushings 12 are on the upper edge of the outer tube 1 or intermediate tube welded on, the welds being identified by the reference number 20.
- the guide bushings 12, 13 are a direct component of the outer or intermediate tube 1 or 2.
- the inner walls of the guide bushings 12, 13 are provided with one of the plurality of guide rings 14 and wiper rings 15.
- the scraper rings 15 are preferably made of a soft rubber elastic ring 16 and a hard plastic ring 17 in a trapezoidal cross section.
- the guide bushes 12, 13 are expediently coated with a corrosion-resistant metallic material (not shown in the drawing).
- the pit ram is provided in the usual way with flow channels 19 and a check valve 18 screwed into the bottom 5 of the intermediate pipe 2 from the inside.
- the associated piston is designated 21.
- the ram foot 4 is first unscrewed from the outer tube 1 and the ram head from the piston rod 3. So then the intermediate tube 2 with the piston rod 3 can be pulled out through the bottom opening of the outer tube 1.
- the base 5 is then unscrewed from the intermediate tube 2, so that finally the piston rod 3 can also be pulled down through the bottom opening of the intermediate tube 2.
- the individual components can then be processed by honing and provided with new guide rings 14 and scraper rings 15. The sealing rings of the piston parts must also be replaced.
- the pit stamp is then reassembled in the reverse manner.
- the embodiment shown in FIG. 2 differs essentially in that the stamping foot 4 and the outer tube 1 are provided with an annular groove 22, wherein Both ring grooves 22 form a common ring channel in the state of coverage, through which a wire pin connecting two components is guided.
- the wire pin 23 can be removed from the ring channel for disassembly.
- the embodiment of FIG. 2 differs in that the stamp head 6 is attached to the head end 24 of the rod 3 and is secured by a bolt. Alternatively, the stamp head 6 can also be scraped onto the head end 24 by means of a cylindrical thread.
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)
- Earth Drilling (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
- Actuator (AREA)
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4023451 | 1990-07-24 | ||
DE4023451 | 1990-07-24 | ||
PCT/EP1991/000459 WO1992001858A1 (de) | 1990-07-24 | 1991-03-12 | Mehrstufiger hydraulischer grubenstempel |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0491882A1 true EP0491882A1 (de) | 1992-07-01 |
EP0491882B1 EP0491882B1 (de) | 1994-09-21 |
Family
ID=6410890
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91905621A Revoked EP0491882B1 (de) | 1990-07-24 | 1991-03-12 | Mehrstufiger hydraulischer grubenstempel |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0491882B1 (de) |
DE (2) | DE9116604U1 (de) |
PL (1) | PL294208A1 (de) |
WO (1) | WO1992001858A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19647943C1 (de) * | 1996-11-20 | 1998-06-18 | Dbt Gmbh | Hydraulischer Doppelteleskopstempel |
CN101105133B (zh) * | 2007-07-27 | 2010-05-19 | 中国矿业大学 | 双伸缩悬浮式液压立柱 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1050524A (de) * | ||||
DE1098889B (de) * | 1958-02-20 | 1961-02-09 | Bwg Bergwerk U Walzwerk Maschb | Bodenverschluss fuer den Arbeitszylinder hydraulischer Grubenstempel |
GB1093778A (en) * | 1965-08-17 | 1967-12-06 | Dowty Mining Equipment Ltd | Fluid-pressure-operated prop |
DE2403852C3 (de) * | 1974-01-28 | 1981-01-08 | Gewerkschaft Eisenhuette Westfalia, 4670 Luenen | Hydraulischer Teleskopstempel für den Grubenausbau |
DE3421002A1 (de) * | 1984-06-06 | 1985-12-12 | GAG Grubenausbau GmbH, 5840 Schwerte | Hydraulischer stempel in modulbauweise |
DE3904644C1 (en) * | 1989-02-16 | 1990-03-29 | Hermann Hemscheidt Maschinenfabrik Gmbh & Co, 5600 Wuppertal, De | Hydraulic pit prop |
-
1991
- 1991-03-12 EP EP91905621A patent/EP0491882B1/de not_active Revoked
- 1991-03-12 DE DE9116604U patent/DE9116604U1/de not_active Expired - Lifetime
- 1991-03-12 PL PL29420891A patent/PL294208A1/xx unknown
- 1991-03-12 DE DE59103043T patent/DE59103043D1/de not_active Revoked
- 1991-03-12 WO PCT/EP1991/000459 patent/WO1992001858A1/de not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO9201858A1 * |
Also Published As
Publication number | Publication date |
---|---|
PL294208A1 (de) | 1993-02-08 |
EP0491882B1 (de) | 1994-09-21 |
DE59103043D1 (de) | 1994-10-27 |
DE9116604U1 (de) | 1993-03-11 |
WO1992001858A1 (de) | 1992-02-06 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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GBV | Gb: ep patent (uk) treated as always having been void in accordance with gb section 77(7)/1977 [no translation filed] |
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27W | Patent revoked |
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