US3421795A - Fluid pressure supply system - Google Patents

Fluid pressure supply system Download PDF

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Publication number
US3421795A
US3421795A US642558A US3421795DA US3421795A US 3421795 A US3421795 A US 3421795A US 642558 A US642558 A US 642558A US 3421795D A US3421795D A US 3421795DA US 3421795 A US3421795 A US 3421795A
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shifting
valve
piston
fluid
pressure
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Willy Heyer
Friedrich Brinkmann
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Gewerkschaft Eisenhutte Westfalia GmbH
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Gewerkschaft Eisenhutte Westfalia GmbH
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F13/00—Transport specially adapted to underground conditions
    • E21F13/08—Shifting conveyors or other transport devices from one location at the working face to another
    • E21F13/086—Armoured conveyors shifting devices

Definitions

  • Pressure fluid supply system for longwall mining operations including a pressure fluid flow conduit circuit for supplying fluid to a series of shifting means composed of coacting pistons and cylinders which are to be arranged in spaced apart disposition along a guide for a mining machine to urge the guide against the mine face to enable the mining machine to engage operatively such mine face to extract material therefrom, at least some of the shifting means having corresponding quantity-regulating metering means, e.g.
  • a double acting piston pump flow-connected therewith in the circuit either upstream or downstream of the shifting means therefor, to determine the fluid quantity flowing through the particular shifting means, and metering valve control means to control the flow of fluid through the metering means to operate the metering means and thereby to regulate the fluid quantity flowing through the associated shifting means, whereby to achieve substantially unyielding urging via such shifting means of such guide even during passage of the mining machine thereat and controlled advance of the guide and in turn of the mining machine in the direction of the mine face in dependence upon the quantity regulation by the metering means of the fluid flowing through the corresponding shifting means associated therewith.
  • the present invention relates to a pressure fluid supply system for a series of shifting devices which are arranged to press a guide means for a mineral winning machine against a longwall working face so that the winning machine moved along on the guide means engages the working face with its cutting tools under adequate pressure and sufliciently deeply.
  • a common pressure conduit normally connects the individual shifting devices in such manner that the mining machine, especially if it is a coal plough or planer, forces back the conveying means or other guide in the region of the planer passage and thus pushes the piston rods into the cylinders of the shifting devices. After the passage of the planer, the piston rods "ice push out again and press the conveyor against the mine face as before, since the pressure fluid supply conduits of the shifting devices are connected in common with one another.
  • This action which is known as so-called breathing of the conveyor or other guide, occurs to a greater extent in the case of the use of mining machines which require a lane or planer alley between the mine face and guide (for example the conveying means), to permit the extraction or loading work to be performed, since this alley on the one hand is necessary during the passage of the mining machine yet on the other hand closes again immediately after the passage of the mining machine due to the pressure of the shifting devices against the guide.
  • the so-called breathing action of the guide has decisive disadvantages.
  • this action stresses the guide to a great extent.
  • the mining machine with its associated guide can be controlled on the mine face only with very great difliculty.
  • a conveying means is used as a guide and a planer provided with a sword or keel is used, the conveying means lifts considerably during the passage of the planer, and after the passage slides itself on to the fine coa l remaining in the planer alley.
  • the mining machine and the traction means used to conduct such machine back and forth along the mine face are greatly stressed, with the result that damage occurs to the traction means such as a chain or to the traction drive (for example shear bolt fractures).
  • the shifting devices must be driven with a hydraulic pressure which is considerably below the hydraulic pressure of other hydraulic units necessary for the mining operation (such as hydraulic prop supports), so that the pressure of the shifting devices against the mine face does not become too great.
  • shifting devices such as shifting piston-cylinder means
  • quantityregulating means such as metering pump means
  • FIG. 1 shows schematically in section a specific type of quantity-regulating device usable in accordance with the present invention
  • FIG. 2 shows schematically a circuit diagram of a fluid flow system usable in accordance with one particular embodiment of the invention including a quantity-regulating device connected in the pressure line upstream of the shifting piston-cylinder means to be regulated; and
  • FIG. 3 shows schematically a circuit diagram of a fluid flow system usable in accordance with another particular embodiment of the invention including a quantity-regulating device connected in the pressure line downstream of the shifting piston-cylinder means to be regulated.
  • an advantageous and versatile pressure fluid supply system for longwall mining operations which comprises pressure fluid flow conduit circuit means, a series of shifting means including coacting shifting piston and cylinder means flow-connected with said circuit means, said shifting means being.
  • shifting means each having operatively flow-connected therewith in said circuit means a corresponding pressure fluid quantity-regulating metering means which determines the pressure fluid quantity operatively flowing through the particular shifting means associated therewith and which is operated by pressure fluid from said circuit means, and metering valve control means operatively flow-connected with each said metering means to control the flow of pressure fluid through said metering means to operate said metering means and to regulate in turn the pressure fluid quantity flowing through the associated shifting means, whereby to achieve substantially unyielding urging via such shifting means of such guide means even during passage of the mining machine thereat and controlled advance of such guide means and in turn of the mining machine in the direction of the mine face, in dependence upon the quantity regulation by the metering means of the fluid flowing through the corresponding shifting means associated therewith.
  • the present invention thus achieves the above-noted objects by providing a quantity-regulating metering means or device which determines the inflow or outflow quantity of the hydraulic fluid which is allocated preferably to each shifting device.
  • a constant cutting allowance is settable by means of the guide of the mining machine.
  • the shifting devices actually form to a certain extent a non-yieldable abutment which, after every pass age of the mining machine. shifts forward by an amount corresponding to the mining machine or the mine face newly exposed, without the entire guide of the mining machine being pressed against the mine face after the passage of the mining machine.
  • a conveying means such as a conventional double chain scraper conveyor, is used as guide, this conveying means no longer lifts itself away from the floor during the passage of the mining machine and can no longer slide onto the cushion of fine coal, so that very favorable guidance of the mining machine along the mine face is ensured.
  • the quantity-regulating device is connected according to one particular feature of the instant invention into the pressure conduit of the shifting device and includes a cylinder having a double-acting piston slidably guided therein, the movement of the piston being limited at each end of the cylinder by means of stop members, one of which is adjustable.
  • Such adjustable stop can be a spindle, for example, which according to a further feature of the invention is provided with a scale indicating the stroke volume of the quantity-regulating device.
  • a cylinder with float piston guided therein the stroke volume being adjustable preferably by displacement of a cylinder head.
  • the quantity of fluid fed to the shifting device is determined in dependance upon the quantity of fluid removable therefrom, which then flows through the quantity-regulating device.
  • the shifting device operates in essentially the same manner whether use is made of a cylinder having a double-acting piston slidably guided therein, on the pressure side of the shifting piston-cylinder means, i.e. upstream thereof, or of a cylinder having a float piston slidably guided therein, on the exhaust side of the shifting piston-cylinder means, i.e. downstream thereof.
  • Both such devices serve to regulate the quantity of pressure fluid, e.g. hydraulic oil, flowing to or through the shifting device, whereby to extend such device and in turn urge the guide means and mining machine against the mine face in a controlled manner.
  • a non-return valve which prevents the return flow of the pressure medium. It is advantageous here to arrange an adjustable over-pressure valve between each shifting device and the non-return valve provided in the pressure conduit of each shifting device, so that despite the almost unyieldable guidance, the mining machine or guide means or pressure fluid system is not damaged for example in the extraction of a heterogeneous mine face, i.e. one which is permeated with rock inclusions.
  • the overpressure valve therefore responds, according to a further feature of the invention, only in the case where the return forces or counterforces met at the mine face can no longer be taken up by the mining machine, such as a mining planer.
  • the shifting devices are chargeable with individual or common quantity-regulation, so that the possibility is provided of being able to extract mineral such as coal from the mine face even only over certain sections thereof.
  • the impulse emission for the quantity-regulated charging of one or more shifting devices can take place manually or automatically, preferably hydraulically, pneumatically or electrically, from a central control position, if desired. Independently of this, naturally the volumes of individual quantity-regulating devices can be adjusted, so that the orientation of the arrangement at the mine face can take place to a certain extent automatically.
  • one or more quantity-regulating devices can be disconnected from the system.
  • This disconnectability can be effected by means of a blockable connection of the shifting device to the pressure conduit, such as by way of appropriate valves, whereby the quantity-regulating device may be by-passed, or it can be so formed that between the quantity-regulating device and shifting device there is arranged a control block, e.g. in the form of a multi-position valve which permits the control positions extend, retract and shut-off to be effected.
  • a control block e.g. in the form of a multi-position valve which permits the control positions extend, retract and shut-off to be effected.
  • the invention provides a method in which several shifting device act upon one abutment, such as a mining conveyor, while due to the quantity-regulated charging of several shifting devices a non-yielda-ble guide is formed which adjustably determines the distance between the mine face to be won and the shifting device.
  • a quantity-regulating metering means in the form of device 2 (see FIG. I) which includes a cylinder 4 and a piston 5 which can slide back and forth between the stops 6 and 7.
  • the pressure fluid for operating the quantity regulating device 2 is supplied and withdrawn according to choice through the conduits 17 and 18 to provide a metering piston pump action.
  • the stroke volume of the quantity-regulating device 2 is adjustable by means of a spindle 8 extending in axially slidable sealed disposition through the corresponding end of cylinder 4 and provided with a scale 9 at the exposed outer end portion thereof. Stop 7 is fixed to the spindle inner end.
  • the pressure fluid supply system circuit as shown in FIG. 2 provides for the flow of pressure fluid from the pressure conduit 3 through the metering valve control means in the form of a control block 19, having the alternate flow valve portions 19a and 19b, and the conduit 18 into the quantity-regulating device 2, (such as that of FIG. 1 but here shown more schematically in the interests of clarity).
  • the piston 5 in this case expels the'fluid situated in quantity-regulating device 2 through the conduit 17 via control block 19 and the shifting control valve in the form of the control block 16 into the shifting device 1 which is in the form of a double-acting piston-cylinder means.
  • the control block 16 having the valve positions 16a, 16b and 160, is of such formation that the shifting device 1 can be shut off completely at position 16b as shown, or be provided with direct flow via positions 16a or 16c to either side of the piston thereof alternately, depending on which of the three valve positions of control block 16 is selected.
  • the pressure fluid flows through an over-pressure valve 13, schematically shown, into the return conduit 10.
  • the entire shifting arrangement, including the shifting device 1 and the quantity-regulating device 2 can be operated from a central control position via a remote control valve 14: shown schematically.
  • Valve 14 is linked operatively by any suitable means with control block 19, such as hydraulic servo means, to displace block 19 from the normal spring-urged position 19a to the alternate flow position 19b, upon axial displacement from the closed flow position 14a to the open position 14b. On reverse actuation, block 19 returns to position 19a.
  • Blocks 15 and 16 operate in similar fashion by axial displacement. Such displacement may be individual for blocks 15, 16 and 19, e.g. by manual actuation, or automatic, e.g. by remote control operation as shown for block 19. Also, several blocks 16 and/or 15 and/or 19 may be ganged, i.e. connected for joint and/or simultaneous actuation, to achieve a common urging effect along a given portion of the guide means being urged against the mine face.
  • a double-chain scraper conveyor 20 of the conventional type is indicated as the guide.
  • the shifting device 1 bears for example through a drag prop 21 against the roof 22, but it can equally be supported on support frames, i.e. self-propelling pit props or frames or the like, if desired, and of course other guides such as a planer track may be used rather than a conveyor.
  • the shifting device 1 is connected directly to the pressure conduit 3' through a nonreturn valve 12 with the quantity-regulating device 2' located on the exhaust (downstream) side of the shifting device 1' rather than on the pressure (upstream) side thereof as in FIG. 2.
  • the quantity-regulating device 2' comprises a float piston 5' which slides freely in the cylinder 4' and the stroke of which is adjustable by axially adjustable cylinder heads 11, 11 shown schematically, whereby to provide -a metering piston pump action.
  • the possible extension distance of the hollow piston rod 23 is determined by the quantity of fluid receivable by the adjustable quantity-regulating device 2 and flowing out from the annular cylinder space 24 of the shifting device 1'.
  • Over-pressure valve 13 corresponds in function to valve 13 of FIG.
  • the quantity-regulating device 2 delivers the fluid through the control block 25, having the alternate flow positions 25a and 25b and corresponding in form and operation to control block 19 of FIG. 2, to the return conduit 10'.
  • the control 'block 26 associated with the shifting device 1' combines the functions of blocks 15 and 16 of FIG. 2, more or less.
  • Block 26 is axially slidable, e.g. by manual or automatic actuation as discussed above (as is block among the three control positions, i.e. position 27 (for achieving extension with stroke limitation of shifting device 1 according to the cutting depth), position 28 (for achieving extension without stroke limitation or correction of the cutting depth or alignment of the guide) and position 29 (for achieving retraction without stroke limitation or drawing up of the shifting device).
  • the quantity of fluid passing through the shifting means may be regulated by simple actuation of the metering valve control means, e.g. control block 19 or 25, to attain limited extension (i.e. stroke amplitude) of the shifting means from the shifting means starting retracted position while withstanding (except in dependence upon the adjustable actuation pressure level of the overpressure valve) counterpressures exerted against the shifting means which would normally cause at least temporary receding or retraction thereof (i.e. stroke amplitude regression).
  • the metering valve control means e.g. control block 19 or 25
  • each metering means is provided with adjustment means for adjusting the quantity of pressure fluid which flows through the particular shifting means associated therewith.
  • each metering means includes metering piston-cylinder means in the form of a cylinder having a double-acting piston operatively slidably received therewithin, the corresponding valve control means therefor being flow-connected therewith to supply pressure fluid alternately as intake to each side of said piston upon corresponding alternate actuation of such valve control means such that the pressure fluid in the cylinder on the correspondingly opposite side from the intake side is forced as exhaust therefrom, the pressure fluid stroke quantity as intake and exhaust corresponding to the fluid quantity flowin g through the associated shifting means.
  • the adjustment means for the metering means may include an axially adjustable stop at a corresponding end of said cylinder to limit the movement of said piston therewithin.
  • a stationary stop may be disposed at the opposite end of the cylinder from that having the adjustable stop and the adjustable stop may be in the form of a spindle.
  • spindle extends outwardly through the corresponding wall of said cylinder and the extended end thereof contains a scale indicating the stroke volume of the metering piston-cylinder means in dependence upon the axial position in said cylinder of said adjustable stop.
  • the metering piston-cylinder means may be disposed in the circuit means upstream of the corresponding shifting means to control the supply of pressure fluid to such shifting means, or downstream thereof to control the exhaust of pressure fluid from such shifting means and thereby the supply of pressure fluid to such shifting means.
  • the piston may be a floating piston within the cylinder and the adjustment means may include an axially displaceable head at a corresponding end of said cylinder to limit the movement of said piston therewithin.
  • the circuit means may be provided with a nonreturn valve operatively positioned on the pressure side of each such shifting means, as well as an adjustable over-pressure valve operatively positioned between said shifting means and said non-return valve.
  • the over-pressure valve is adjusted to respond only when the pressure fluid backforce corresponds to an overpressure in the shifting means caused by excessive counterforces met by the mining machine at the mine face which are suflicient to displace the mining machine and the guide means therefor away from the-mine face and in turn change the fluid disposition within said shifting means.
  • each corresponding shifting piston of the shifting piston and cylinder means may be provided with an over-pressure valve for over-pressure flow communication between the corresponding cylinder portions on the axial sides thereof.
  • valve control means for the metering means may be individually operated, they may also be remotely operated by remote control means operatively connected with said valve control means for controlling said valve control means from a remote control position.
  • the circuit means may include disconnect by-pass valve means flow-connectable with said shifting means to disconnect said metering means from said circuit means and to permit direct bypass operation of said shifting means independently of said metering means.
  • the disconnect valve means may include a direct by-pass valve and a three-position shifting control valve for said shifting means positioned operatively in said circuit means, said shifting control valve normally being in flow-connection with said metering means and upon actuation of said by-pass valve said shifting control valve being placed in direct by-pass flow-connection with said by-pass valve, such that said shifting control valve in one alternate position supplies fluid to one side of the shifting piston means of the shifting means, in another alternate position supplies fluid to the other side of said shifting piston means, and in a further alternate position shuts off said shifting means from all fluid flow.
  • the disconnect valve means may include a three-position shifting control valve positioned operatively in said circuit means, such that said shifting control valve in one alternate position supplies fluid to one side of the shifting piston means of the shifting means and exhausts fluid from the other side of said shifting piston means Without any fluid flow through said metering means, in another alternate position supplies fluid to such other side of said shifting piston means and exhausts fluid from such one side of said shifting piston means without any fluid flow through said metering means, and in a further alternate position supplies fluid to one of said sides of said shifting piston means while passing exhaust fluid from the corresponding other side to said metering means via said valve control means.
  • a plurality of adjacent shifting means may be controlled, in accordance with the present invention, in unison by corresponding metering means to act in a nonyieldable manner and which may be extended in adjustable increments.
  • the metering means is in the form of a double acting piston pump and said circuit means is provided with a shifting control valve for said shifting means, a non-return valve, an adjustable over-pressure valve, and a by-pass valve, said circuit means flow-connecting in turn said valve control means with said pump, said pump with said non-return valve, said non-return valve with said shifting control valve, and said shifting control valve with said shifting means, with said over-pressure valve being positioned operatively between said non-return valve and said shifting control valve and with said by-pass valve being positioned operatively in direct flow-connection with said shifting control valve downstream of said non-return valve and upstream of said over-pressure valve to permit by-pass direct operation of said shifting means independently of said pump.
  • the metering means is in the form of a double acting pump and said circuit means is provided with a three position shifting control valve for said shifting means, a non-return valve, and an adjustable over-pressure valve, said circuit means flow-connecting said non-return valve with said shifting control valve, and in turn flowconnecting said shifting control valve in one alternate position with one side of the shifting piston means of said shifting means while permitting exhaust of fluid from the other side of said shifting piston means without any fluid flow through said pump, in another alternate position with such other side of said shifting piston means while permitting exhaust of fluid from such one side of said shifting piston means without any fluid flow through said pump, and in a further position with one of such sides of said shifting piston means while permitting exhaust of fluid from the other of such sides of said shifting piston means to pass to said valve control means for passage through said pump, with said over-pressure valve being positioned operatively in said shifting piston means for over-pressure flow-communication between the corresponding cylinder portion on the axial sides thereof.
  • Pressure fluid supply system for longwall mining operations which comprises pressure fluid flow conduit circuit means, a series of shifting means including coacting shifting piston and cylinder means flow-connected with said circuit means, said shifting means being adapted to be arranged in spaced apart disposition along a guide means for a mining machine to urge such guide means against a mine face thereat to enable such mining machine to engage operatively such mine face to extract mineral therefrom, at least some of said shifting means each having operatively flow-connected therewith in said circuit means a corresponding pressure fluid quantityregulating metering means which determines the pressure fluid quantity operatively flowing through the particular shifting means associated therewith and which is operated by pressure fluid from said circuit means, and metering valve control means operatively flow-connected with each said metering means to control the flow of pressure fluid through said metering means to operate said metering means and to regulate in turn the pressure fluid quantity flowing through the associated shifting means, whereby to achieve substantially unyielding urging via such shifting means of such guide means even during passage of the mining machine thereat and controlled advance of such guide means
  • each such shifting means is provided with a corresponding metering means and valve control means.
  • valve control means for said metering means are individually operated.
  • valve control means for said metering means are remotely operated by remote control means operatively connected with said valve control means for controlling said valve control means from a remote control position.
  • said metering means is in the form of a double acting piston pump and said circuit means is provided with a shifting control valve for said shifting means, a non-return valve, an adjustable over-pressure valve, and a by-pass valve, said circuit means flow-connecting in turn said valve control means with said pump, said pump with said non-return valve, said non-return valve with said shifting control valve, and said shifting control valve with said shifting means, with said over-pressure valve being positioned operatively between said non-return valve and said shifting control valve and with said by-pass valve being positioned operatively in direct flow-connection with said shifting control valve downstream of said non-return valve and upstream of said over-pressure valve to permit by-pass direct operation of said shifting means independently of said pump.
  • said metering means is in the form of a double acting piston pump and said circuit means is provided with a three position shifting control valve for said shifting means, a non-return valve, and an adjustable over-pressure valve, said circuit means flow-connecting said non-return valve with said shifting control valve, and in turn flow-connecting said shifting control valve in one alternate position with one side of the shifting piston of said shifting means while permitting exhaust of fluid from the other side of said shifting piston means without any fluid flow through said pump, in another alternate position with such other side of said shifting piston means while permitting exhaust of fluid from such one side of said shifting piston means without any fluid flow through said pump, and in a further position with one of such sides of said shifting piston means while permitting exhaust of fluid from the other of such sides of said shifting piston means to pass to said valve control means for passage through said pump, with said over-pressure valve being positioned operatively in said shifting piston means for over-pressure flow-communication between the corresponding cylinder portions on the axial sides thereof.
  • circuit means includes disconnect by-pass valve means flow-connected with said shifting means to disconnect said metering means from said circuit means and to permit direct bypass operation of said shifting means independently of said metering means.
  • said disconnect valve means include a direct by-pass valve and a threeposition shifting control valve for said shifting means positioned operatively in said circuit means, said shifting control valve normally being in flow-connection with said metering means and upon actuation of said by-pass valve said shifting control valve being placed in direct by-pass flow-connection with said by-pass valve, such that said shifting control valve in one alternate position supplies fluid to one side of the shifting piston means of the shifting means, in another alternate position supplies fluid to the other side of said shifting piston means, and in a further alternate position shuts off said shifting means from all fluid flow.
  • said disconnect valve means includes a three-position shifting control valve positioned operatively in said circuit means, such that said shifting control valve in one alternate position supplies fluid to one side of the shifting piston means of the shifting means and exhausts fluid from the other side of said shifting piston means without any fluid flow through said metering means, in another alternate position supplies fluid to such other side of said shifting piston means and exhausts fluid from such one side of said shifting piston means without any fluid flow through said metering means, and in a further alternate position supplies fluid to one of said sides of said shifting piston means while passing exhaust fluid from the corresponding other side to said metering means via said valve control means.
  • each said metering means is provided with adjustment means for adjusting the quantity of pressure fluid which flows through the particular shifting means associated therewith.
  • each said metering means includes metering piston-cylinder means in the form of a cylinder having a double-acting piston operatively slidably received therewithin, the corresponding valve control means therefor being flow-connected therewith to supply pressure fluid alternately as intake to each side of said piston upon corresponding alternate actuation of such valve control means, such that the pressure fluid in the cylinder on the correspondingly opposite side from the intake side is forced as exhaust therefrom, the pressure fluid stroke quantity as intake and exhaust corresponding to the fluid quantity flowing through the associated shifting means.
  • said adjustment means include an axially adjustable stop at a corresponding end of said cylinder to limit the movement of said piston therewithin.
  • each corresponding shifting piston means of said shifting piston and cylinder means is provided with an over-pressure valve for over-pressure flow-communication between the corresponding cylinder portions on the axial sides thereof.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Earth Drilling (AREA)
  • Machines For Laying And Maintaining Railways (AREA)
US642558A 1966-06-18 1967-05-31 Fluid pressure supply system Expired - Lifetime US3421795A (en)

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Application Number Priority Date Filing Date Title
DE1483957A DE1483957C3 (de) 1966-06-18 1966-06-18 Rückeinrichtung für einen Strebförderer oder eine Führungsschiene mit daran geführter Gewinnungsmaschine

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3531162A (en) * 1967-12-09 1970-09-29 Gullick Ltd Metered supply of pressure fluid for longwall advance system
US3898845A (en) * 1973-01-31 1975-08-12 Gewerk Eisenhuette Westfalia Mineral mining installations
US4264237A (en) * 1978-07-12 1981-04-28 Bergwerksverband Gmbh Method for controlling a hydraulically operated mine roof support and an arrangement for carrying out the method
US20130255802A1 (en) * 2012-04-02 2013-10-03 Cameron International Corporation Valve and hydraulic controller
US20130256570A1 (en) * 2012-04-02 2013-10-03 Cameron International Corporation Valve and hydraulic controller

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2258423C3 (de) 1972-11-29 1980-11-13 Gewerkschaft Eisenhuette Westfalia, 4670 Luenen Einrichtung zum Rücken der Führung einer Gewinnungsmaschine o.dgl. für Bergbau-Gewinnungsbetriebe, mit dosierter Beaufschlagung der Rückzylinder
DE2265518C3 (de) * 1972-11-29 1982-04-01 Gewerkschaft Eisenhütte Westfalia, 4670 Lünen Einrichtung zum Rücken der Führung einer Gewinnungsmaschine o.dgl. für Bergbau-Gewinnungsbetriebe mit dosierter Beaufschlagung der Rückzylinder
DE4019607C2 (de) * 1990-06-20 1994-02-17 Hemscheidt Maschf Hermann Steuersystem für Ausbaugestelle eines Strebs

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2692767A (en) * 1950-12-23 1954-10-26 Goodman Mfg Co Indexing means for continuous mining machine heads
US2859022A (en) * 1955-04-04 1958-11-04 Dowty Mining Equipment Ltd Hydraulic roof supports and conveyor feed jacks
US3120105A (en) * 1959-09-25 1964-02-04 Coal Industry Patents Ltd Self-advancing mine roof supports
US3309880A (en) * 1963-07-22 1967-03-21 Dowty Mining Equipment Ltd Mining apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2692767A (en) * 1950-12-23 1954-10-26 Goodman Mfg Co Indexing means for continuous mining machine heads
US2859022A (en) * 1955-04-04 1958-11-04 Dowty Mining Equipment Ltd Hydraulic roof supports and conveyor feed jacks
US3120105A (en) * 1959-09-25 1964-02-04 Coal Industry Patents Ltd Self-advancing mine roof supports
US3309880A (en) * 1963-07-22 1967-03-21 Dowty Mining Equipment Ltd Mining apparatus

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3531162A (en) * 1967-12-09 1970-09-29 Gullick Ltd Metered supply of pressure fluid for longwall advance system
US3898845A (en) * 1973-01-31 1975-08-12 Gewerk Eisenhuette Westfalia Mineral mining installations
US4264237A (en) * 1978-07-12 1981-04-28 Bergwerksverband Gmbh Method for controlling a hydraulically operated mine roof support and an arrangement for carrying out the method
US20130255802A1 (en) * 2012-04-02 2013-10-03 Cameron International Corporation Valve and hydraulic controller
US20130256570A1 (en) * 2012-04-02 2013-10-03 Cameron International Corporation Valve and hydraulic controller

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DE1483957A1 (de) 1969-04-17
DE1483957B2 (de) 1974-03-28
GB1160328A (en) 1969-08-06
DE1483957C3 (de) 1978-12-14

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