DE8712289U1 - Hydraulic cylinder - Google Patents
Hydraulic cylinderInfo
- Publication number
- DE8712289U1 DE8712289U1 DE8712289U DE8712289U DE8712289U1 DE 8712289 U1 DE8712289 U1 DE 8712289U1 DE 8712289 U DE8712289 U DE 8712289U DE 8712289 U DE8712289 U DE 8712289U DE 8712289 U1 DE8712289 U1 DE 8712289U1
- Authority
- DE
- Germany
- Prior art keywords
- cylinder
- cylinders
- hydraulic cylinder
- hydraulic
- outer cylinder
- 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
Links
- 229910000906 Bronze Inorganic materials 0.000 claims description 5
- 239000010974 bronze Substances 0.000 claims description 5
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 230000003628 erosive effect Effects 0.000 description 4
- 244000309464 bull Species 0.000 description 2
- 238000005422 blasting Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000005488 sandblasting Methods 0.000 description 1
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
- E21D23/04—Structural features of the supporting construction, e.g. linking members between adjacent frames or sets of props; Means for counteracting lateral sliding on inclined floor
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J10/00—Engine or like cylinders; Features of hollow, e.g. cylindrical, bodies in general
- F16J10/02—Cylinders designed to receive moving pistons or plungers
- F16J10/04—Running faces; Liners
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Geochemistry & Mineralogy (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mechanical Engineering (AREA)
- Geology (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Architecture (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Description
Hydraulikzylinder! :*..:Hydraulic cylinder! :*..:
i I I I 1 · 1 , , , , *i I I I 1 · 1 , , , , *
·■·■
Die Erfindung betrifft Hydraulikzylinder für den Schildausbau unter Tage, insbesondere teleskopierbare Zylinder mit Innenzylinder und Außenzylinder aus Stahl.The invention relates to hydraulic cylinders for underground shield support, in particular telescopic cylinders with inner cylinder and outer cylinder made of steel.
Hydraulikzylinder im Schildausbau unter Tage unterliegen einem erheblichen Verschleiß. Der Verschleiß wird wesentlich durch die hohen Drücke und den geringen Ölanteil in Hydraulikflüssigkeiten unter Tage verursacht. Mit zunehmender Betriebsdauer stellen sich insbesondere an den Gleitflächen der Zylinder die Verschleißerscheinungen ein. Eine gefürchtete Verschleißerrcheinung ist der Lochfraß. Dabei handelt es sich um Erosionsstellen, die darauf zurückgeführt werden, daß nach Entstehen geringfügiger Erosionen das Druckmittel Gelegenheit findet mit hoher Geschwindigkeit bzw. mit · hohem Druck an den Erosionsstellen von einem 2ylinderraum in den anderen zu entweichen.Hydraulic cylinders in shield support underground are subject to considerable wear. The wear is caused primarily by the high pressures and the low oil content in hydraulic fluids underground. As the operating time increases, signs of wear appear, particularly on the sliding surfaces of the cylinders. One dreaded sign of wear is pitting. This is erosion, which is attributed to the fact that after minor erosion has occurred, the pressure medium has the opportunity to escape from one cylinder chamber to the other at high speed or with high pressure at the erosion points.
Sobald Zylinder einen unzulässig hohen Druckverlust Zeigen, werden die Zylinder einer Reparatur zugeführt. Nach Demontage der Zylinder werden der Innen- urd Außenzylinder ausgedreht. Das Ausdrehen ist jedoch nur im geringen Maß möglich, da der Zylinder sonst seine vorgesehene Festigkeit nicht mehr auf v/eist.As soon as cylinders show an unacceptably high pressure loss, the cylinders are sent for repair. After dismantling the cylinders, the inner and outer cylinders are turned out. However, turning out is only possible to a limited extent, as otherwise the cylinder will no longer have the intended strength.
Es ist bekannt, spanabhebend bearbeitete Gleitflächen durch eine Auftragsschweißung wieder auf ihr ursprüngliches Niveau anzuheben. Der Erfindung liegt die Aufgabe zugrunde, die Lebensdauer von Hydraulikzylindern zu verlängern. Nach der Erfindung wird das mit Hilfe einer Bronzeschicht auf den Innengleitflachen vcn Innenzylinder und/oder Außenzylinder der Hydraulikzylinder erreicht. Vorzugsweise handelt es sich um auftragsgeschweißte Bronzeschichten.It is known to restore machined sliding surfaces to their original level by means of a welded overlay. The invention is based on the task of extending the service life of hydraulic cylinders. According to the invention, this is achieved with the help of a bronze layer on the inner sliding surfaces of the inner cylinder and/or outer cylinder of the hydraulic cylinder. These are preferably welded overlay bronze layers.
• · ) I• · ) I
» · Il » · The
Ht IMt fill > Ht IMt fill >
• ·< t &iacgr; 4 < » 4 -· 4 2 · -• ·< t &iacgr; 4 < » 4 -· 4 2 · -
2&eegr; der Zeichnung ist ein teleskopierbarer Hydraulikzylinder schematisch dargestellt« Mit 1 ist der Innenzylindeif bezeichnet, der in einem Aüßenzylinder 2 gleitet. IW Betriebszustand gleitet in dem Innenzylinder ein Kolben, der über eine Kolbenstange nach außen tritt* Die Innenfläche des innenzylinders ist mit 3 bezeichnet, die des Aüßenzylindeifs 2 mit 4.2&eegr; the drawing shows a telescopic hydraulic cylinder schematically« The inner cylinder is designated 1, which slides in an outer cylinder 2. In the operating state, a piston slides in the inner cylinder, which protrudes outwards via a piston rod* The inner surface of the inner cylinder is designated 3, that of the outer cylinder 2 is designated 4.
Im Ausführungsbeispiel handelt es sich um einen Zylinder für den Schildausbe»u unter Tage, der nach erheblicher Betriebszeit Unter Tage einer Reparatur zugeführt werden mußte. Im Rahmen der Reparatur sind Erosionsstellen an den Innenflächen von Innenzyiinder i und Außenzylinder 2 durch Ausdrehen der Zylinder und Sandstrahlung bzw. Glasstrahlung beseitigt bzw. gesäubert worden. Anschließend ist eine Bronzeschicht mit einer Auftragsschweißung auf die Innenflächen 3 und gelegt worden. Die Brönzeschicht wird nach der Auftragsschweißung durch Drehen und Schleifen spanabhebend bearbeitet, bis das ursprüngliche Passungsmaß der Zylinder wieder erreicht ist.The example shown is a cylinder for shield mining underground, which had to be repaired after a considerable period of operation underground. As part of the repair, erosion spots on the inner surfaces of the inner cylinder 1 and outer cylinder 2 were removed or cleaned by turning the cylinders and sandblasting or glass blasting. A bronze layer was then applied to the inner surfaces 3 and 4 using a build-up weld. After the build-up weld, the bronze layer is machined by turning and grinding until the original fit of the cylinders is achieved again.
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE8712289U DE8712289U1 (en) | 1987-09-10 | 1987-09-10 | Hydraulic cylinder |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE8712289U DE8712289U1 (en) | 1987-09-10 | 1987-09-10 | Hydraulic cylinder |
Publications (1)
Publication Number | Publication Date |
---|---|
DE8712289U1 true DE8712289U1 (en) | 1989-01-05 |
Family
ID=6811970
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE8712289U Expired DE8712289U1 (en) | 1987-09-10 | 1987-09-10 | Hydraulic cylinder |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE8712289U1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1992020903A1 (en) * | 1991-05-10 | 1992-11-26 | Volker Merz | Shaft lining support |
-
1987
- 1987-09-10 DE DE8712289U patent/DE8712289U1/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1992020903A1 (en) * | 1991-05-10 | 1992-11-26 | Volker Merz | Shaft lining support |
GB2262552A (en) * | 1991-05-10 | 1993-06-23 | Volker Merz | Shaft lining support |
US5273378A (en) * | 1991-05-10 | 1993-12-28 | Volker Merz | Support column |
GB2262552B (en) * | 1991-05-10 | 1995-05-10 | Volker Merz | Support column |
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