EP0224242A1 - Soupape hydraulique pour l'industrie minière - Google Patents

Soupape hydraulique pour l'industrie minière Download PDF

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Publication number
EP0224242A1
EP0224242A1 EP86116351A EP86116351A EP0224242A1 EP 0224242 A1 EP0224242 A1 EP 0224242A1 EP 86116351 A EP86116351 A EP 86116351A EP 86116351 A EP86116351 A EP 86116351A EP 0224242 A1 EP0224242 A1 EP 0224242A1
Authority
EP
European Patent Office
Prior art keywords
valve
hydraulic
electromagnet
hydraulic valve
piston
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
Application number
EP86116351A
Other languages
German (de)
English (en)
Other versions
EP0224242B1 (fr
Inventor
Kurt Faust
Ernst Mateja
Felix Ecker
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.)
ECKER MASCHINENBAU GMBH & CO. KG
Original Assignee
Ecker Maschinenbau & Co KG GmbH
Ecker Maschinenbau GmbH
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 Ecker Maschinenbau & Co KG GmbH, Ecker Maschinenbau GmbH filed Critical Ecker Maschinenbau & Co KG GmbH
Publication of EP0224242A1 publication Critical patent/EP0224242A1/fr
Application granted granted Critical
Publication of EP0224242B1 publication Critical patent/EP0224242B1/fr
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
    • 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
    • E21D23/16—Hydraulic or pneumatic features, e.g. circuits, arrangement or adaptation of valves, setting or retracting devices

Definitions

  • the invention relates to a hydraulic valve for mining with a pilot control actuated by an intrinsically safe electromagnet and having a piston cylinder for the movement of the valve body of the hydraulic valve, in particular for the neighborhood control in the step expansion.
  • the hydraulic valves cannot be operated directly. They require a pilot control, ie mechanical actuators.
  • the hydraulic medium is used: a piston cylinder is actuated with it, which moves the valve body of the hydraulic valve. Since the intrinsically safe electromagnet is comparatively weak, it cannot directly control the action of the hydraulic medium on the piston cylinder. A gradation is also necessary in between. It is known, for example, to first open a passage cross section of 0.8 mm in diameter, for which the force of the intrinsically safe electromagnet is sufficient, and to open a passage cross section with the then flowing hydraulic medium diameter of 6 mm, which is required to make the piston cylinder work fast enough.
  • the invention has for its object to provide a simple pilot control.
  • this purpose is achieved in a hydraulic valve of the type mentioned at the outset in such a way that the piston cylinder is a pneumatic cylinder which is controlled by a valve actuated directly by the intrinsically safe electromagnet.
  • the viscosity of the compressed air is incomparably lower than that of the pressurized water.
  • the flowability of the compressed air is so much greater that even a flow cross-section, which the intrinsically safe electromagnet can release immediately, is sufficient to allow the quantity to flow quickly enough that the pneumatic cylinder produces the desired movement of the valve body of the hydraulic valve, and this itself at the lower pneumatic pressures of, for example, 2 to 6 bar and the correspondingly larger necessary volume of the cylinder.
  • the pressure reduction compared to the hydraulic pilot controls is partially compensated for by the fact that only smaller control forces are required and the flow cross-section in question can therefore be larger. Its diameter is, for example, 2 to 3 mm compared to the 0.8 mm mentioned above in the hydraulic pilot control.
  • the actuating force required for the hydraulic valve can be limited in such a way that the hydraulic valve has a pressure-relieving design.
  • the electromagnet can still work with a lower current.
  • 30 to 60 mA are sufficient compared to 280 mA for the well-known hydraulic pilot control. This is a significant advantage in that there is often a need to switch several hydraulic valves simultaneously on the same line, but the total current flow should not exceed the limit of 12 V and 1 A, which is considered to be intrinsically safe.
  • the invention even allows the advantageous embodiment and further development to feed the electromagnet with a battery which is arranged in the overall device in question, preferably on the hydraulic valve itself and only for this.
  • a button battery can be enough.
  • the effort involved consists of a particularly complex wiring of the thirty shields in question with soldering or gold contacts to reduce the contact resistance and with protective sheathing.
  • the electromagnet is controlled by frequency control, preferably audio frequency control, or by light control.
  • the frequency control has the advantage of an unlimited number of electromagnets individually in the scope under consideration or to be able to operate simultaneously.
  • the operation is not only possible as before, in neighborhood control, but also from the longwall.
  • the same line can also provide feedback on the execution of the tax act as well as a fault report. This means that all information can be forwarded to the surface without significant effort and the shield removal of the entire pit can be carried out in a central office monitor in detail.
  • the drawing shows an embodiment of the invention.
  • the hydraulic valve 1 has a valve body 3 in a valve housing 2.
  • the valve body 3 consists entirely of a piston rod 6 connecting two pistons 4 and 5 provided with sealing rings 35 and carrying a closure body 7.
  • the closure body 7 is a double-sided. It has a valve cone 9 or 10 on both sides of a cylindrical central section 8 and, following this, a turn cylindrical section 11 or 12.
  • the cylindrical sections 11 and 12 and the pistons 4 and 5 all have the same diameter.
  • valve seat 13 made of a soft plastic, such as polyacetate or polyamide or Teflon.
  • the valve seat 13 has matching counter surfaces to the valve cone 9 and the cylindrical section 11.
  • valve seat 13 separates between an inlet space 17 and an outlet space 18, the valve seat 14 between the outlet space 18 and a further outlet space 19.
  • the inlet space 17 is connected by radial bores 20 to an annular space 21 into which a connection (not shown) for the hydraulic medium leads.
  • the radial bores 20 and the annular space 21 are located in an insert sleeve 22 in which a cylinder space for the piston 4 is formed.
  • the outlet space 18 is connected by radial bores 23 to an annular space 24, from which an outlet, not shown, leads to the consumer.
  • the radial bores 23 and the annular space 24 are located in an insert sleeve 25; the annular space 24 is also partially recessed in the valve housing 2.
  • a return flow line 26 leads from the further outlet space 19 to a tank for the hydraulic fluid.
  • sealing rings can be seen, the function of which can be seen from their position.
  • a plunger 30 is directed against the return spring 29 on the piston 4 and is seated as a piston rod on a piston 32 arranged in a pneumatic cylinder 31 and provided with a sealing ring 40.
  • the pneumatic cylinder 31 is screwed axially to the valve housing 2 and secured by a lock nut 33. Its front end opposite the valve housing 2 is formed by a disk 34. A spring 36 is arranged between the latter, which forms a guide for the plunger 30 with a central bore, and the rear of the piston 32.
  • the pneumatic cylinder 31 On its other end face, the pneumatic cylinder 31 is screwed to an attachment part 37, in which a valve 38 and an electromagnet 39 are arranged.
  • the valve 38 is a piston valve.
  • a piston 42 is arranged in a cylindrical bore 41 of the attachment part 37. On the circumference, two annular spaces 43 and 44 are cut and each sealed by sealing rings 45. The annular space 43 is connected by radial bores 46 to an axial bore 47 which opens out on the end face of the piston 42 facing the pneumatic cylinder 31. The other annular space 44 is a dead space.
  • a compressed air connection 48 opens into the annular space 44, while a ventilation bore 49 leads from the annular space 43 to the outside.
  • a spring 50 holds the piston 42 in this position.
  • An axial bore 51 connects the cylindrical bore 41, i.e. the valve 38 with the pneumatic cylinder 31.
  • a coil 52 and a pot-shaped core 53 can be seen from the electromagnet 39, from which a plunger 54 projects through a seal 55 into the valve 38, where it presses on the piston 42 with the force of a spring 57 supported against a screw cap 56 .
  • the plunger 54 pushes the piston 42 with the annular space 43 in front of the compressed air connection 48.
  • the pneumatic cylinder 31 is then acted upon by the compressed air through the bores 46, 47 and 51.
  • Its plunger 30 displaces the valve body 3.
  • the closure body 7 changes from the valve seat 13 into the valve seat 14. Even before its cylindrical section 11 has left its counter surface in the valve seat 13, the cylindrical section 12 has entered its counter surface 16 in the valve seat 14. This prevents the hydraulic fluid from penetrating from the inlet space 17 into the further outlet space 19 and the return flow line 26. Otherwise, the cylindrical sections 11 and 12 act as damping pistons; they avoid sudden movement of the valve body.
  • Hydraulic pressure 320 bar; smallest hydraulic flow cross-section: corresponding to circular cross-section with 10 mm diameter; pneumatic pressure: 4 bar; smallest pneumatic flow cross-section: corresponding to circular cross-section with 2.5 mm diameter; Pneumatic piston diameter 42: 22 mm.

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)
  • Magnetically Actuated Valves (AREA)
EP86116351A 1985-11-27 1986-11-25 Soupape hydraulique pour l'industrie minière Expired - Lifetime EP0224242B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853541870 DE3541870A1 (de) 1985-11-27 1985-11-27 Hydraulikventil fuer den bergbau
DE3541870 1985-11-27

Publications (2)

Publication Number Publication Date
EP0224242A1 true EP0224242A1 (fr) 1987-06-03
EP0224242B1 EP0224242B1 (fr) 1990-01-10

Family

ID=6286951

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86116351A Expired - Lifetime EP0224242B1 (fr) 1985-11-27 1986-11-25 Soupape hydraulique pour l'industrie minière

Country Status (2)

Country Link
EP (1) EP0224242B1 (fr)
DE (2) DE3541870A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2377480A (en) * 2001-03-15 2003-01-15 Dbt Gmbh Electrohydraulic control device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10314867B4 (de) * 2003-04-01 2008-11-13 Bucyrus Dbt Europe Gmbh Mehrstufiges Steuerventil insbesondere für den untertägigen Schildausbau und Schildausbau

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2410200A1 (fr) * 1977-11-29 1979-06-22 Gewerk Eisenhuette Westfalia Valve electromagnetique utilisable en particulier dans les systemes de commande hydrauliques d'exploitations minieres au fond
FR2531765A1 (fr) * 1982-08-11 1984-02-17 Hemscheidt Maschf Hermann Dispositif pour la commande d'un distributeur electro-hydraulique

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2410200A1 (fr) * 1977-11-29 1979-06-22 Gewerk Eisenhuette Westfalia Valve electromagnetique utilisable en particulier dans les systemes de commande hydrauliques d'exploitations minieres au fond
FR2531765A1 (fr) * 1982-08-11 1984-02-17 Hemscheidt Maschf Hermann Dispositif pour la commande d'un distributeur electro-hydraulique

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
GLÜCKAUF, Band 117, Nr. 18, September 1981, Seiten 1161-1162, Bochum, DE; C.-D. HERMS: "Elektrohydraulische Ausbausteuerung auf der Bergbau 81" *
MACHINE DESIGN, Band 46, Nr. 16, 27. Juni 1974, Seiten 70-74, Cleveland, US; L.L. BOULDEN: "Valves that take orders from computers" *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2377480A (en) * 2001-03-15 2003-01-15 Dbt Gmbh Electrohydraulic control device
US6837269B2 (en) 2001-03-15 2005-01-04 Dbt Gmbh Electrohydraulic control device
GB2377480B (en) * 2001-03-15 2005-08-24 Dbt Gmbh An electrohydraulic control device
AU785063B2 (en) * 2001-03-15 2006-09-14 Caterpillar Global Mining Europe Gmbh An electrohydraulic control device

Also Published As

Publication number Publication date
EP0224242B1 (fr) 1990-01-10
DE3668217D1 (de) 1990-02-15
DE3541870A1 (de) 1987-06-04

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