US3453935A - Mine roof support systems - Google Patents

Mine roof support systems Download PDF

Info

Publication number
US3453935A
US3453935A US713635A US3453935DA US3453935A US 3453935 A US3453935 A US 3453935A US 713635 A US713635 A US 713635A US 3453935D A US3453935D A US 3453935DA US 3453935 A US3453935 A US 3453935A
Authority
US
United States
Prior art keywords
valves
piston
roof support
plug
primary
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
US713635A
Other languages
English (en)
Inventor
Hans Rieschel
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.)
Bergwerksverband GmbH
Original Assignee
Bergwerksverband 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 Bergwerksverband GmbH filed Critical Bergwerksverband GmbH
Application granted granted Critical
Publication of US3453935A publication Critical patent/US3453935A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • E21D23/26—Hydraulic or pneumatic control
    • 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
    • E21D23/006—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor provided with essential hydraulic devices
    • E21D23/0065—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor provided with essential hydraulic devices driven, or automatically, e.g. electrically-hydraulically controlled
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/43—Programme-control systems fluidic
    • G05B19/44—Programme-control systems fluidic pneumatic

Definitions

  • the present invention relates more particularly to the control of self-advancing mine roof support units and one particular object of the invention is to provide an improved control system in which the operations of the mine roof support units are brought about in accordance with a particular time sequence, as opposed to being interdependent with the advancing of one unit being initiated by a signal given by a neighbouring unit to indicate that the neighbouring unit has finished its advancing operation.
  • the present invention consists in a control circuit for at least two self-advancing mine roof support units of which each unit comprises: at least two roof support frames which are provided with hydraulic roof support rams and are connected by an advancing ram, characterized in that the circuit comprises (a) for each unit, primary fluid-operated valves for operating roof support rams and the advancing ram,
  • (g) means for driving the secondary ganging device.
  • Each of the primary ganging devices and their servomotors can be constituted by a cam shaft arranged to operate the respective set of secondary valves, a free wheel connected with the shaft, a double-acting fluidoperated cylinder and piston unit, one side of the piston being connected with one of the tertiary valves, while the other side of the piston is connected with a source of fluid under constant pressure.
  • each of the secondary valves and their primary gauging means can be constituted by a multi-connection valve comprising a rotary plug or core with axially spaced ports in it, a casing with ports arranged to 3,453,935 Patented. July 8, 1969 come sequentially into coincidence with the ports of the core on rotation of the plug, and duct means for leading fluid under pressure into an axially extending cavity in the plug.
  • the casing can comprise a bush and a body surrounding the bush.
  • the plug can have peripheral grooves which are arranged to serve for the release of fluid under pressure out of the ports in the casing, the ports in the plug being placed in lands forming interruptions in the grooves in the plug.
  • the plug can be provided with detent means for holding it in different positions of rotation.
  • a fluidoperated servo-motor in the form of a piston and cylinder unit, the piston being arranged to open and close a port controlling the passage of fluid into the plug as the piston is moved.
  • FIG. 1 is a diagrammatic plan view of self-advancing mine roof support units and their fluid-operated control system.
  • FIG. 2 is a diagrammatic view of a servo-motor arranged to operate in steps and forming part of the control system.
  • FIG. 3 shows part of a cam and its associated valve.
  • FIG. 4 is an end-on view of a valve arrangement used in a second embodiment of the invention.
  • FIG. 5 is a longitudinal section of the valve shown in FIG. 4.
  • FIG. 6 is a section of part of the valve shown in FIGS. 4 and 5.
  • a coal front conveyor 2 for transporting away coal cut by a plough or other implement reciprocated along the coal front so as to remove coal from it.
  • a main hydraulic power duct 3 for transporting away coal cut by a plough or other implement reciprocated along the coal front so as to remove coal from it.
  • a main hydraulic power duct 3 for transporting away coal cut by a plough or other implement reciprocated along the coal front so as to remove coal from it.
  • a main hydraulic power duct 3 and a low pressure air duct as is commonly provided in mines.
  • the roof support arrangement in the mine consists of hydraulic support units of which each consists of two frames of which two are indicated by reference numerals 5 and 6.
  • Each unit also comprises an advancing ram of the double-acting type for moving one frame forwards while the other is braced against the roof and then, when the frame just advanced has been braced against the roof and the other frame depressurized, drawing the latter forwards.
  • Each unit comprises five rams, that is to say ram 7 and two roof support rams in each frame.
  • each unit is connected with primary valves, denoted by general reference numeral PV by means of ducts 8, 9, 10, and 11.
  • Primary valves denoted by general reference numeral PV by means of ducts 8, 9, 10, and 11.
  • Each set of primary valves is supplied with high pressure hydraulic fluid from the hydraulic main duct 3 via a duct 1.2. It can thus be seen that the units A, B, and C are connected in parallel and not in series in this respect.
  • the two ducts 8 and 11 serve for depressurizing and pressurizing the rams in the frames 5 and 6, and the ducts 9 and 10 for supplying the two sides of the double-acting ram 7.
  • one of the frames, 5 is lowered by depressurizing its rams
  • the rear of the ram 7 is put under pressure so that its plunger is extended and the frame 5 is moved forwards
  • the frame 5 is raised against the roof again by pressurizing its rams
  • the front space of the ram 7 is put under pressure so that the cylinder of the ram is moved forwards together with the unit 6 which in the meantime has been depressurized.
  • the performance of these steps in the correct. time sequence is ensured by means of cam shaft 21, with cams 17-20,
  • ganging means form part of the respective units and operate secondary valves 23-26 by means of the cams 17-20.
  • the secondary valves 2326 control flow to operate the primary valves of the units to which they belong by means of compressed air carried by ducts, the supply of compressed air from the compressed air line 4 to the secondary valves not being especially shown in the figure.
  • each cam shaft 21 is provided with a servo-motor denoted by general reference numeral 22.
  • the motor consists of a cylinder 30 having at its bottom end a hole 31 for the admission of compressed air supplied by tertiary valve, to be described, from the compressed air duct 40. This compressed air acts against the lower face 32 of a piston 33 having a piston rod 34' which emerges from the top end of the cylinder 30.
  • the top face 34 of the piston is connected via an opening 35 in the cylinder with a source of liquid at constant pressure.
  • the tertiary valves 41, 42, and 43 which are provided with compressed air via a duct 50 connected with the compressed air duct 4 via a duct 51.
  • the duct 51 also leads to a pneumatic drive motor 45 having a rotating shaft connected with a gear wheel 46 which is in mesh with a further gear wheel, not denoted by a reference numeral, fixed on a further cam shaft 44.
  • the latter constitutes a secondary ganging means and serves for the operation of the tertiary valves 4143 by means of cams 47.
  • the cams 4 7 have projections 52 over the range denoted by the double arrow 49.
  • the associated tertiary valve 41 is operated, via a cam follower 52', four times and this moves the piston 33 four times through its stroke from the bottom end of the cylinder 30 towards the top.
  • the arrangement is such that when the cam follower 52' is between two cam projections 52 the piston 33 and consequently the cam shaft 21 are in such positions that one of the primary valves is open and one of the rams in the associated roof support unit is being operated, that is to say liquid is flowing in or out of it.
  • FIGS. 4 to 6 show a further valve mehanism, constituting the primary ganging means and secondary valves, in accordance with a further embodiment of the invention.
  • the valve mechanism comprises a casing which is made up of a body 60 with a stationary cylindrical bush 72 mounted in it.
  • the valve mechanism is operated by means of a ram 61, see FIG. 4, having a piston 62 and connected by duct 63 with one of the tertiary valves 41-43.
  • the left-hand face of the piston 62 is connected via duct 64 with a braking medium.
  • the piston rod 65 By means of its piston rod 65, whose left-hand part is in the form of a rack, the piston 62 rotates a gear wheel 66 connected with a freewheel mechanism 67.
  • the free-wheel is arranged to turn a plug or core 68 of the valve mechanism in one direction only, that is to say counter-clockwise in terms of FIG. 4. There is no rotation of the plug 68 on the return movement of the piston 62 to the right.
  • the plug 68 has a central duct 69 having a right-hand radial opening 70 which is connected with an annular peripheral groove 71 in the plug.
  • the groove 71 is closed by means of the inner surface of stationary bush 72.
  • the bush 72 has a radial opening 73 which coincides with the opening 70 in the plug 68.
  • Duct B is supplied with liquid under pressure and ends opposite opening 73.
  • the plug 68 also comprises four ports 82 for making connection with connectors 7578. Since the ports 82 are similar and the arrangements connecting them with the respective connectors 75-78 are also, the following description, for the sake of convenience, refers only to the possibility of making one connection with one of the connectors 7578, though it must be understood that connection is in fact made with all of them.
  • the connector 77 is connected with a duct 79 passing through the body 60 and leading to an annular groove 80 in the bush 72. Extending radially inwards from this groove there is a port 81 which, in the position shown in the drawing, coincides with port 82 leading to the interior of the plug 68.
  • the port 82 opens in the centre of a land 81' forming an interruption in a groove 14, which is consequently in the form of a C-shaped groove.
  • a port is provided in the bush 72 leading to the groove 14- for draining it. This port in the bush 72 is connected with a suitable waste duct, also not shown in the drawings.
  • the ports 82 are in turn brought into coincidence with the stationary ports 81 and liquid under pressure is forced into the connectors 75-78 to the primary valves PV in a suitable sequence for operation the roof support unit.
  • the port 81 is connected with the C-shaped groove 14 in the plug 68 so that liquid can be discharged to waste.
  • a springloaded detent mechanism is provided generally denoted by reference numeral 90. It has an indexing disc 91 with notch-like recesses for a ball 92, which is loaded by means of a spring 93 so as to snap into the recesses as soon as the plug 68 has come into the position which is to be held by means of the detent.
  • the piston 62 can exert suflicient force to turn the plug 68 against the restraining action of the ball 92 acted upon by the spring 93.
  • the liquid duct B is connected with a port 95 opening onto a collar-like part at the righthand end of the rack.
  • the piston rod 65 is moved to the left by the piston 62 under the action of liquid under pressure from the tertiary valve 41 it moves the collar so far that the right-hand end of the collar 101 uncovers the port 95 and connects it with a space which is connected by a duct A leading to the space at the right-hand end of the piston 62 and hence to the connector 63.
  • the body 60 and the block 61 in which the piston 62 is mounted are separate and held together by suitable means, not shown.
  • each unit comprises: at least two roof support frames whichare provided with hydraulic roof support rams and are connected by an advancing ram, the invention which consists in that the circuit further comprises:
  • each of the primary ganging devices and their servomotors comprise a cam shaft arranged to operate the respective set of secondary valves, a free-wheel connected with the shaft, a double-acting fluid-operated cylinder and piston unit, one side of the piston being connected with one of the tertiary valve means, While the other side of the piston is connected with a source of fluid under constant pressure.
  • casing with ports arranged to come sequentially into coincidence with the ports of the core on rotation of the core, and duct means for leading fluid under pressure into an axially extending cavity in the core.
  • a control circuit in accordance with claim 4, comprising detent means for holding the plug in different positions of rotation.
  • a control circuit in accordance with claim 4, comprising, as the fluid-operated servo-motor, a piston and cylinder unit, the piston being arranged to open and close a port controlling the passage of liquid into the plug as it is moved.

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)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Earth Drilling (AREA)
US713635A 1967-03-30 1968-03-18 Mine roof support systems Expired - Lifetime US3453935A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1967B0091828 DE1289012C2 (de) 1967-03-30 1967-03-30 Einrichtung zur Zeitplansteuerung von hydraulischem Grubenausbau

Publications (1)

Publication Number Publication Date
US3453935A true US3453935A (en) 1969-07-08

Family

ID=6986059

Family Applications (1)

Application Number Title Priority Date Filing Date
US713635A Expired - Lifetime US3453935A (en) 1967-03-30 1968-03-18 Mine roof support systems

Country Status (4)

Country Link
US (1) US3453935A (de)
DE (1) DE1289012C2 (de)
FR (1) FR1563290A (de)
GB (1) GB1216712A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3672176A (en) * 1969-12-18 1972-06-27 Karl Maria Groetschel Roof supporting systems
US4379662A (en) * 1980-06-27 1983-04-12 Thyssen Industrie Ag Control device for an advancing support in underground mining

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2745631B1 (de) * 1977-10-11 1979-02-08 Hemscheidt Maschf Hermann Mehrfachsteuergeraet fuer hydraulischen Schreitausbau
GB2142074B (en) * 1983-06-21 1987-04-23 Dobson Park Ind Control of mine roof supports

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1799113A (en) * 1928-03-31 1931-03-31 Miedbrodt Carl Safety and stopping arrangement for intermittently-operating apparatus
US3379099A (en) * 1965-10-22 1968-04-23 Botalam Installation for the automatic control of hydraulic jacks or like devices

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB798414A (en) * 1954-10-28 1958-07-23 Hunt & Mitton Ltd Improvements in control mechanism for hydraulically operated equipment
FR1315242A (fr) * 1961-12-08 1963-01-18 Distributeur multipulseur plus spécialement destiné à la réalisation d'un soutènement marchant automatique
GB961531A (en) * 1963-05-10 1964-06-24 Pierre Verneuil Improved line guide for a fishing rod

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1799113A (en) * 1928-03-31 1931-03-31 Miedbrodt Carl Safety and stopping arrangement for intermittently-operating apparatus
US3379099A (en) * 1965-10-22 1968-04-23 Botalam Installation for the automatic control of hydraulic jacks or like devices

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3672176A (en) * 1969-12-18 1972-06-27 Karl Maria Groetschel Roof supporting systems
US4379662A (en) * 1980-06-27 1983-04-12 Thyssen Industrie Ag Control device for an advancing support in underground mining

Also Published As

Publication number Publication date
DE1289012C2 (de) 1973-04-05
DE1289012B (de) 1969-02-13
GB1216712A (en) 1970-12-23
FR1563290A (de) 1969-04-11

Similar Documents

Publication Publication Date Title
US2543759A (en) Automatic press
US3453935A (en) Mine roof support systems
US2481991A (en) Hydraulic circuit
GB1418218A (en) Linear hydraulic drive
US2644309A (en) System for controlling the movements of hydraulically operated pistons
US2631542A (en) Hydraulic intensifier
US2111915A (en) Batch-measuring device for feeding materials to curb presses
US3500719A (en) Systems for controlling self-advancing mine roof support units
US2368769A (en) Surge valve
US2316471A (en) Full automatic press control
US3098402A (en) Forging machine
US2555115A (en) Hydraulic decompression circuit with automatic reverse
US2966139A (en) Hydraulic feed means
GB709031A (en) Mining machine
US3399601A (en) Hydraulic sequential control systems
US2102227A (en) Conveyer feed milling machine
US4667698A (en) Hydraulic distributor
US2603176A (en) Hydraulic blankholder press and operating circuit therefor
US3035553A (en) Rotary engine
SU879065A1 (ru) Гидропривод
US2837896A (en) Hydraulic or pneumatic bi-directional impulse motor
US3016707A (en) Hydraulic system for fabricating dies
US3295664A (en) Conveyor drive mechanism
US2545051A (en) Power control for fluid motors
SU731091A1 (ru) Гидропривод подачи исполнительного органа металлорежущего станка