US3661056A - Control systems for self-advancing mine roof supports - Google Patents
Control systems for self-advancing mine roof supports Download PDFInfo
- Publication number
- US3661056A US3661056A US39766A US3661056DA US3661056A US 3661056 A US3661056 A US 3661056A US 39766 A US39766 A US 39766A US 3661056D A US3661056D A US 3661056DA US 3661056 A US3661056 A US 3661056A
- Authority
- US
- United States
- Prior art keywords
- valve assembly
- handle
- assembly
- wire
- movement
- 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
Links
- 230000033001 locomotion Effects 0.000 claims description 25
- 239000012530 fluid Substances 0.000 claims description 10
- 230000000712 assembly Effects 0.000 claims description 4
- 238000000429 assembly Methods 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 4
- 230000008878 coupling Effects 0.000 abstract description 13
- 238000010168 coupling process Methods 0.000 abstract description 13
- 238000005859 coupling reaction Methods 0.000 abstract description 13
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 230000000295 complement effect Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000004519 grease Substances 0.000 description 2
- KHOITXIGCFIULA-UHFFFAOYSA-N Alophen Chemical compound C1=CC(OC(=O)C)=CC=C1C(C=1N=CC=CC=1)C1=CC=C(OC(C)=O)C=C1 KHOITXIGCFIULA-UHFFFAOYSA-N 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 210000000003 hoof Anatomy 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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
Definitions
- the present invention concerns a remote control system especially for mine roof supports of the self-advancing type.
- These supports operate by means of, for example, hydraulically extensible members which are operated to brace the support or part of the support between the floor ,and roof of a mine working, to push or pull another part of the support or an anchorage to another position wherein it will remain and then on release of the support or the first mentioned part to move it relative to said other part or anchorage.
- hydraulically extensible members which are operated to brace the support or part of the support between the floor ,and roof of a mine working, to push or pull another part of the support or an anchorage to another position wherein it will remain and then on release of the support or the first mentioned part to move it relative to said other part or anchorage.
- Various types are known but there are a minimum of two hydraulically extensible members incorporated in a support and usually many more.
- These extensible members are normally operated by a control means such as a valve which regulates the flow of operating fluid to the hydraulically extensible members possibly by means of pilot valves.
- the valve is usually directly manually controlled and used to be provided on the support being con trolled but there is now a tendency to put the manually controlled valve on an adjacent support.
- the fluid interconnections between the control valve and the hydraulically extensible members or the pilot valves have thus to cater for the relative advancing movement of the two supports and are numerous and susceptible to damage.
- a remote control system comprising control means, an operating means for the control means for disposing remotely from the control means, and a rotary flexible mechanical coupling from the operating means to the control means.
- a sheathed torque transmitting wire or a torque transmitting sheath is probably best.
- the sheath can be filled with a plastic medium or grease and act as a pressure transmitting pipe to actuate the Dead Man s I-landle" provision, or a push-pull movement of the wire can be superimposed for this provision on top of a torque-transmitting rotary movement.
- two or more wires can be used possibly within a common sheath.
- the invention is particularly applicable for use with the low torque manually controlled valve available from Gullick Dobson Limited as the control means.
- valve assembly could have fittings to secure the sheath to them and a handle and at least one movable valve member would be connected to or abut the internal wire so that axial and rotary movement would be transmitted from the handle to the movable member of the valve.
- connections at the end of the internal wire could be square section pins fitting into complementary sockets with the length of the wire selected so as to transfer any axial movement by abutment between the wire and the handle at one wire end and the wire and the movable valve member at the other wire end.
- the handle assembly is preferably securable to the body of the valve assembly. This allows fitting a handle assembly directly to a valve assembly on failure of the wire so that the support can be kept in service.
- This fitted handle assembly can be that normally used to control the valve through the intermediary to the failed wire.
- a special key could be provided for operation of the valve assembly.
- the flexible mechanical coupling is neater and less prone to damage and if it is damaged, the mine roof support can very easily be kept in service without waiting for permanent repairs as would be the case with a control fluid hydraulic coupling.
- the supports on both sides would each have a handle assembly connected by a flexible mechanical coupling to the valve assembly.
- the handle assemblies can be positively coupled together through the medium of the flexible coupling so that operation of one handle assembly causes the other handle assembly to repeat the motion or a lost motion device or clutch could be incorporated in both flexible couplings so that the valve assembly could be operated by one handle assembly at a time and on change over between handle assemblies the second handle assembly has initially to move into a correct relationship with the valve assembly.
- FIG. 1 a schematic plan view of a line of mine roof supports
- FIG. 2 a valve assembly in plan section
- FIG. 3 a handle assembly in plan cross-section
- FIG. 4 a modified valve assembly in partial plan section
- FIG. 5 a modified handle assembly in partial plan section
- FIG. 6 a view of a further modification of a valve assembly in simplified perspective view
- FIG. 7 a schematic section of another control system.
- FIG. 1 there are shown parts of three mine roof supports 11, 12 and 13 which have hydraulically extensible members 14 and 15 and which are to be advanced in the direction of arrow X under the control of a valve assembly 17 operated by a handle assembly 16.
- the support 1 l is shown as having been advanced (by means of a handle assembly 16 on the support 12) and the operator will now move to the support 13 to advance the support 12.
- a valve assembly 17 is connected to a respective handle assembly by a sheathed wire or other flexible mechanical coupling 18 such as a Bowden Cable.
- Each valve assembly 17 comprises a base plate 21 having a pressure-fluid inlet 22 and having a plurality of outlets 23 terminating at ports 24 in a valve face 24a of the plate 21.
- a member 25 rotatable in a casing 26 attached to the base plate 21 has inside it an inlet chamber 27 and incorporates a hollow insert 28 forming a single port which is urged by a spring 29 to make a face seal with the valve face and arranged (when the insert is in line with a port 24) to communicate between the inlet chamber 27 and the port.
- a pressure balancing orifice plug 129 is fitted to equalize the static pressure between the inlet chamber 27 and the outlet ports.
- the rotatable member 25 forms a rotating seal in the inlet 22 and an inlet duct 22a in the member connects the inlet and the chamber 27 under the control of a stop valve.
- An insert 30 sealed but slidable in the fluid inlet acts as this stop valve (in cooperation with a valve seat 31 on the rotatable member 25 and under the closing bias exerted by a spring 32).
- a plunger 33 is slidable axially in the rotatable member by an end fitting 34 of a flexible wire and 35 and has fingers 33a to lift the insert 30 from its seat 31 when an axial compression force is transmitted by the wire.
- the wire is enclosed in a sheath 37 which has a non-circular end fitting into a non-circular recess in the end of the rotatable member and which has a collar 37a clamped by means of a screw ring 38 to a threaded end fitting 38a of the rotatable member 25.
- O-ring seals 39 are provided where necessary and a thrust bearing 40 is provided between the casing 26 and the member 25.
- Each handle assembly 16 comprises a handle 41 mounted for pivotal movement about a pin 42 carried by a member 43 rotatable in a base member 44.
- An indented annular insert 45 in the base member 44 cooperates with a spring loaded ball 46 to provide position indication or feel to the rotatable member.
- the sheath 37 has a non-circular end fitting into a non-circular recess in the end of the rotatable member 43 and has a collar 47 clamped by means of a screw ring 48 to an end fitting 49 of the rotatable member 43.
- the wire 35 is disposed at the axis of rotation of member 43 and the pivot pin 42 is disposed so that when the handle is pivotted from the position shown it applies an axial compression force to the wire.
- the spring 32 acts on the wire to return the handle to the illustrated position in a Dead Mans Handle mode of operation.
- FIGS. 4 and 5 One such modification is illustrated in FIGS. 4 and 5.
- the wire 35 has a square end 35a which fits into a square recess in the rotatable member and which is journalled for sliding movement therein.
- the end of the wire bears on the plunger 33 directly.
- the sheath 37 terminates at the collar 37a and is secured to an end fitting 26a of the casing 26 in a dust tight manner by a screw-ring 38.
- the wire 35 terminates in an end fitting 43a with a square recess into which fits a square pin 35b which extends through a square bore in the rotatable member 43 to abut the handle 41.
- This pin 35 is rendered captive by a suitable head 35d.
- the sheath 37 of the cable terminates in a male threaded end fitting 49a of considerable axial extent. This end fitting is screwed into an end fitting or collar 50 freely rotatable on the rotatable member 43 or on the base plate 44.
- the base plate 44 which can be held onto a support by stout spring clips (not shown) can be removed from the support, the sheath can be uncoupled at each end, and the handle assembly mounted directly on the valve assembly with the square pin 35!: taking the place of the square end of the wire. If desired spring clips can be associated with the valve assembly to steady the base plate 44 when used in this mode.
- each of the adjacent supports has a handle assembly and the valve assembly has associated with it two gear wheels 57 (FIG. 6) for rotating a gear wheel 58 formed on the outside of the rotatable member 25.
- the valve assembly ends 35f of the two wires 35 are of angle section so they can each engage in a complementary axial angled slot 59 in a respective gear wheel 57 only in a unique angular relationship between the wire and the gear wheel. Each wire projects through these slots (when the respective handle is pivotted).
- Each wire passes through a hole in a double end lever 60 pivotted on the plunger member 33 and has a stop 61 which abuts the periphery of the hole so that axial force exerted on the wire causes the stop to push on the lever 60 to operate the stop valve and to allow the end to engage in the respective slot.
- the valve assembly would be encased in a housing to which the sheaths of the wires would be attached. On pivotting the handle, the stop 61 would push on the lever 60 but the handle could not be fully pivotted until the handle was in the correct position for the end of the wire to enter the slot 59.
- FIG. 7 illustrates another version of the control system.
- the sheath contains a plastic medium 70 such as grease or a thick paste.
- a plunger 71 with sealing rings 72 is slidable in the handle end of the sheath 37.
- This plunger can be integral with the wire 35 or the wire can be non-rotationally but axially movable in the plunger 71.
- the wire 35 is axially movable but non-rotational in a piston 73 with sealing rings 74.
- the wire fits into blind holes in the plunger 71 and piston 73 so as to avoid the need for sealing the wire to the plunger 71 and piston 73.
- the plunger On pivotting the handle, the plunger forces the medium along the sheath and extends the piston 73. This is arranged to push on the plunger 33 while the wire as in the embodiment of FIGS. 4 and 5 transmits torque. It would be possible to transmit the torque by the sheath 37 as in the em bodiment of FIGS. 2 and 3 with a saving in complexity.
- a control system comprising an hydraulic valve assembly including an hydraulic valve mounted on one of the mine roof supports for selectively, supplying hydraulic fluid to an hydraulic ram or combination of rams forming part of the mine roof support, said valve comprising a multi-ported member for selective communication with the rams, a single ported member capable of movement relative to the multi-ported member in a mode such as to put its single port in sealed communication with a selected one of the plurality of ports in the multi-ported member, a closure member arranged selectively to prevent and allow flow of pressure-fluid through the selected one of the plurality of ports by movement of said closure member in another mode, one of said modes being rotational and the other linear, and a bias means urging said closure member to prevent said flow, an operating assembly adapted to be disposed remotely from the valve assembly and including a handle mounted therein for rotational and tilting movement, a flexible sheath means connecting the operating assembly and the valve assembly and
- a control system according to claim 1 wherein the first mentioned one of the means is the further means which also is the second mentioned one of said means, the operating assembly having a member rotatable with the handle and the further means having an end fitting which slidably but nonrotationally cooperates with the said rotatable member and an end fitting which is slidably but non-rotationally secured to one of the ported members.
- a control system according to claim 1 wherein the operating assembly and the valve assembly are adapted to fit together so that the operating assembly can be used to control the valve assembly if there is a failure necessitating removal of said means.
- a control system according to claim 1 wherein two operating assemblies are associated with the valve assembly, the valve assembly incorporating two selectively engageable gear wheels for causing the rotational mode.
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)
- Mechanically-Actuated Valves (AREA)
- Lining And Supports For Tunnels (AREA)
- Multiple-Way Valves (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2687269 | 1969-05-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3661056A true US3661056A (en) | 1972-05-09 |
Family
ID=10250546
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US39766A Expired - Lifetime US3661056A (en) | 1969-05-28 | 1970-05-22 | Control systems for self-advancing mine roof supports |
Country Status (7)
Country | Link |
---|---|
US (1) | US3661056A (fr) |
JP (1) | JPS5126362B1 (fr) |
CA (1) | CA919925A (fr) |
FR (1) | FR2048819A5 (fr) |
GB (1) | GB1295079A (fr) |
PL (1) | PL72769B1 (fr) |
ZA (1) | ZA703511B (fr) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2128878A (en) * | 1935-03-22 | 1938-08-30 | Trico Products Corp | Windshield cleaner control mechanism |
US2202422A (en) * | 1937-08-02 | 1940-05-28 | Addison C Hoof | Remote control for governors |
US3289625A (en) * | 1965-04-21 | 1966-12-06 | Stanley King N | Boat hull drain assembly |
US3434389A (en) * | 1965-01-21 | 1969-03-25 | Gewerk Eisenhuette Westfalia | Automatic sequence cycle controlled advanceable mining prop arrangement |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS441196Y1 (fr) * | 1965-06-01 | 1969-01-17 | ||
US3405567A (en) * | 1967-03-01 | 1968-10-15 | Morse Controls Inc | Selective vernier control |
-
1969
- 1969-05-28 GB GB2687269A patent/GB1295079A/en not_active Expired
-
1970
- 1970-05-22 US US39766A patent/US3661056A/en not_active Expired - Lifetime
- 1970-05-25 ZA ZA703511A patent/ZA703511B/xx unknown
- 1970-05-26 FR FR7019139A patent/FR2048819A5/fr not_active Expired
- 1970-05-26 CA CA083718A patent/CA919925A/en not_active Expired
- 1970-05-27 PL PL1970140921A patent/PL72769B1/pl unknown
- 1970-05-28 JP JP45045248A patent/JPS5126362B1/ja active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2128878A (en) * | 1935-03-22 | 1938-08-30 | Trico Products Corp | Windshield cleaner control mechanism |
US2202422A (en) * | 1937-08-02 | 1940-05-28 | Addison C Hoof | Remote control for governors |
US3434389A (en) * | 1965-01-21 | 1969-03-25 | Gewerk Eisenhuette Westfalia | Automatic sequence cycle controlled advanceable mining prop arrangement |
US3289625A (en) * | 1965-04-21 | 1966-12-06 | Stanley King N | Boat hull drain assembly |
Also Published As
Publication number | Publication date |
---|---|
PL72769B1 (fr) | 1974-08-30 |
JPS5126362B1 (fr) | 1976-08-06 |
CA919925A (en) | 1973-01-30 |
ZA703511B (en) | 1971-01-27 |
GB1295079A (fr) | 1972-11-01 |
FR2048819A5 (fr) | 1971-03-19 |
DE2025293A1 (fr) | 1972-03-09 |
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