US3434389A - Automatic sequence cycle controlled advanceable mining prop arrangement - Google Patents

Automatic sequence cycle controlled advanceable mining prop arrangement Download PDF

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US3434389A
US3434389A US671896A US3434389DA US3434389A US 3434389 A US3434389 A US 3434389A US 671896 A US671896 A US 671896A US 3434389D A US3434389D A US 3434389DA US 3434389 A US3434389 A US 3434389A
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Prior art keywords
prop
control
unit
frame
mining
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US671896A
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English (en)
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Hans-Theodor Grisebach
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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
    • 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
    • E21D23/18—Hydraulic or pneumatic features, e.g. circuits, arrangement or adaptation of valves, setting or retracting devices of advancing mechanisms
    • 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
    • E21D23/12—Control, e.g. using remote 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
    • E21D23/12—Control, e.g. using remote control
    • E21D23/14—Effecting automatic sequential movement of supports, e.g. one behind the other
    • E21D23/148—Wireless transmission of signals or commands
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H43/00—Time or time-programme switches providing a choice of time-intervals for executing one or more switching actions and automatically terminating their operations after the programme is completed
    • H01H43/10—Time or time-programme switches providing a choice of time-intervals for executing one or more switching actions and automatically terminating their operations after the programme is completed with timing of actuation of contacts due to a part rotating at substantially constant speed
    • H01H43/16—Time or time-programme switches providing a choice of time-intervals for executing one or more switching actions and automatically terminating their operations after the programme is completed with timing of actuation of contacts due to a part rotating at substantially constant speed stopping automatically after a predetermined plurality of cycles of operation

Definitions

  • the present invention relates to an automatic sequence cycle controlled advanceable mining prop arrangement, and more particularly an advanceable mining prop arrangeme'nt having a pair of mining props interconnected by motive means for alternate actuation to advance the arrangement, in combination with automatic sequence valve control means operatively connected with the valve means of the mining prop arrangement for regulating the corresponding pressure fluid flow therethrough in predetermined ordinal sequence and for predetermined intervals in an automatic cycle operation whereby to advance the mining prop arrangement automatically, preferably from a remote control point.
  • Mining prop arrangements are known which are usually used in connection with a conventional mining conveyor whereby to guide a mining machine, such as a mining planer, along the mine face for the extraction of mineral therefrom, with the conveyor and in turn the mining machine associated therewith being advanced in increments or in a more or less continuous manner under the urging force of an advancing cylinder, i.e., doubleacting piston-cylinder means, or by means of the mining prop arrangement associated with the conveyor for supporting the mine roof at the site of mining operations.
  • a mining machine such as a mining planer
  • manipulators i.e., portable remote control central units, which remotely control a given groupof mining prop units.
  • any control especially remote control of the advanceable mining prop arrangement and concomitantly of the positioning of the mining machine and/or the conveyor, etc, has been undertaken by equipment which could only control the individual steps or functions in a given prop unit, rather than automatically in a timed cycle, all of such steps or functions following one another without further control.
  • wireless transmitters and the like have been used at a remote point for controlling, via a receiver, control means installed in a mining machine or other equipment utilized in the mining operations to accomplish the particular actuation desired.
  • the transmitter is adjusted at a different frequency or pulse to control a given advancement individual function or step, such as in a mining prop unit.
  • a mining prop unit concomitantly would have receiver means associated therewith receptive to the different frequencies or pulses of the transmitter whereby to control an individual function or step in the operation of the mining prop unit in dependence upon the selected frequency. Understandably, the fruition of the foregoing involves relatively complicated transmitters and receivers and even the results are not completely effective.
  • FIG. 1 is an enlarged schematic top view of an automatic sequence valve control means utilized for controlling a prop frame unit in accordance with the present invention
  • FIG. 2 is a schematic top view of a plurality of individual prop frame units disposed in side by side relation with each having an automatic sequence valve control means in accordance with the present invention assigned thereto, such sequence valve control means being operatively interconnected for controlling the advancement of the particular units in a given predetermined sequence;
  • FIG. 3 is a schematic view of an alternate manner of controlling the switch means for initiating the operation of the automatic sequence valve control means of the invention
  • FIG. 4 is a schematic side view of a prop frame of an advanceable mining prop frame unit in accordance with the present invention having wireless receiving means thereon for controlling the advancement of the unit;
  • FIG. 5 is an enlarged schematic perspective view of a particular embodiment of the automatic sequence valve control means of the present invention which is controlled remotely by a wireless transmitting device.
  • an advanceable mining prop arrangement which comprises an advanceable prop unit including hydraulically actuata'ble motive means having a first motive part and a second motive part operatively interconnected for back and forth alternate longitudinal displacement with respect to each other upon corresponding alternate hydraulic actuation, motive valve means controlling such alternate hydraulic actuation, prop means including a first prop connected to said first motive part for longitudinal displacement therewith and a second prop connected to said second motive part for longitudinal displacement therewith, each said prop being hydraulically actuatable independently of the other to change the effective length thereof for alternate extension into and retraction from supporting engagement with the mine roof and mine floor upon corresponding alternate hydraulic actuation, and first prop valve means for said first prop and second prop valve means for said second prop correspondingly controlling such alternate hydraulic actuation, in combination with automatic sequence valve control means operatively connected with said motive valve means, first prop valve means and second prop valve means to actuate said valve means for regulating the corresponding hydraulic flow therethrough in predetermined ordinal sequence and for predetermined intervals in an
  • supplemental manual switch means are provided in operative association, separately from said sequence valve control means, with said motive valve means, first prop valve means and second prop valve means to permit alternative manual actuation of said valve means.
  • sequence valve control means it is expedient to provide the sequence valve control means at a remote distance from the prop unit in question to permit control without danger to the operator from resultant changes in condition of the prop unit and the mine roof area being supported thereby.
  • the sequence valve control means include an automatic timer device which when switched from inactive to active condition passes through a timed cycle to control the actuation in turn of said valve means in the required sequence, preferably with the timer device passing through a pre-active condition of pre-set duration prior to attaining the active condition, as a safety delay period to permit the operator to leave the immediate prop unit site before the resultant changes in condition of such prop unit and the mine roof area being supported thereby occur upon the timer device attaining the active condition.
  • Such timer device may include a control block having a dial face with valve means switch contacts to control the corresponding hydraulic flow through the various valve means and a sweep-hand switch contact movable from a starting position, preferably initially through a pre-active portion of the dial for attaining the pre-active condition of pre-set duration and thence, through the active portion of the dial in contact for predetermined intervals in time controlled sequence ordinally with the valve contacts to achieve the automatic advancement of the prop unit in question.
  • the automatic timer device may include a drive linkage operatively connected with displaceable cam means and cam actuatable response means operatively connectable with the valve means to control the correspondingly hydraulic flow therethrough, with the drive linkage being energizable to displace the cam means to actuate follower means forming a part of the response means to thereby control the valve means.
  • the automatic timer device may be operated by a clock mechanism, such as a spring driven or electrically driven clock mechanism, or an electrical motor, or similar connection means, so as to attain upon switching from inactive to active condition a predetermined duration automatic cycle for ordinal sequence switching of the various valve means to attain the advancement of the prop unit in question.
  • a clock mechanism such as a spring driven or electrically driven clock mechanism, or an electrical motor, or similar connection means, so as to attain upon switching from inactive to active condition a predetermined duration automatic cycle for ordinal sequence switching of the various valve means to attain the advancement of the prop unit in question.
  • a plurality of advanceable prop units of the instant type may be provided in succession in operative adjacency for the simultaneous and/or successive operation of the timer devices via cable means for the successive and/or simultaneous advancement of the various prop units in the group.
  • remote control means may be provided in connection with the automatic timer device of the present invention to switch the same on and off whereby to attain the inactive and active conditions thereof, such remote control means contemplating in particular a pulse signal transmitting wireless device remote from the mining prop arrangement and a pulse signal receiving wireless device operatively connected with the appropriate timer device to actuate the same upon the pulses received.
  • the energy for carrying out the foregoing may be provided by bat teries associated with the particular prop frame unit or by spring energy, such as a coil spring in wind-up clock- Works, or the like.
  • hydraulic is meant to cover pressure fluid or pressure fluid operated equipment whether per se hydraulic or pneumatic, or the like.
  • FIG. 1 shows an automatic timer device in accordance with one embodiment of the present invention including a control block 1 having an adjustable short-time clockwork 2 therein with an adjustment disc or dial face 3 on the upper side thereof along which sweep hand 4 carried by spindle 5 travels such that the sweep hand switch contact 6 traces a circular path about spindle 5 as axis along the dial face 3.
  • the free end 7 of sweep hand 4 is provided with an oblique surface 8.
  • Adjacent one portion of the dial face 3, a releasable locking member 9 is provided which contains the long arm 10 and the short arm 11, locking member 9 being pivotable about pivot 12 on control block 1.
  • a Bowden cable or the like is provided adjacent locking member 9, including the flexible tube 13 and the flexible cable 15 disposed therewithin for axial displacement therewithin, cable 15 having a pushpin 14 adjacent the short arm 11 of locking member 9, whereby upon projection of pushpin 14 outwardly through the corresponding end of tube 13 locking member 9 will be released to permit sweep hand 4 to initiate its movement in the direction of arrow 16. Upon completion of the sweep hand movement around dial face 3, the same reaches the end position stop 17.
  • a similar Bowden cable is provided at the end position stop 17 on control block 1 including the flexible tube 13 and the flexible cable 15' axially displaceable therewithin and having at the outer end thereof a pushpin 18.
  • the sweep hand 4 reaches end position stop 17 oblique surface 8 will strike pushpin 18 forcing the corresponding cable 15 inwardly within tube 13.
  • the other end of the cable 15 is arranged at a successive control block of the type in question with an appropriate pushpin for controlling the releasable locking member thereat similar to the locking member 9 adjacent the pushpin 14 shown in FIG. 1.
  • a plurality of timer devices in accordance with the present invention may be started successively after the sweep hand of the prior control block of a previous timer device has reached its end position stop. This is seen more clearly from FIG. 2.
  • the spindle may be connected with a clockwork, either electrically energized or energized by a loaded spring, such as a coil spring conventionally used for wind-up clocks.
  • a loaded spring such as a coil spring conventionally used for wind-up clocks.
  • the sweep hand 4 may be turned manually in the direction of arrow 19 to place the same behind the long arm of the locking means 9 until locking means 9 is released for the next actuation desired.
  • stop 17 may be releasably arranged to permit the sweep hand 4 to pass by the same to the initial starting position, wherupon by suitable energizing of the electric motor or similar means used for driving the same, the sweep hand may be used again for the complete sweep of the entire face.
  • Locking member 9 may be appropriately modified or omitted in the case where electrical motor means are used to rotate spindle 5, and/ or sweep hand 4 may be attached to spindle 5 in a sliding friction manner to permit the simple adjustment of the sweep hand with respect to spindle 5 in the same way as the hands of a clock may be rotated on the spindle while the spindle is held from rotation.
  • the sweep hand passes through a preactive portion 20 of the entire face to achieve a preactive condition of the timer device, i.e., a delay period which will permit the operator to remove himself from the immediate vicinity of the mining prop unit before the advance to ensure his safety.
  • the preactive period may be adjusted in a given manner by adjusting the inactive portion of sweep hand 4 closer or farther from stop 17, utilizing indicia provided on dial face 3 for measuring the time delay desired.
  • the locking member 9 may be arranged such that the same may be positioned at various places closer to or farther from stop 17 or control block 1 to achieve a corresponding variation in the time delay permitted during the preactive condition of the sweep hand 4.
  • valve means are not shown, as the artisan will appreciate, these elements are conventional and the timer device including control block 1 merely acts as an automatic time control selective mechanism to complete the cycle of actuation by any means such as servomotors or the like, relating to the retraction of the first prop frame, advancement thereof, extension of such first prop frame, retraction of the second prop frame, and advancement thereof, followed by extension of such second prop frame to attain the original fully supported condition of the prop unit.
  • the combination of the timer device of the present invention in the form of a control block In with an advanceable mining prop unit 39a is shown, the prop unit comprising generally one prop connected with one part of the motive means with the other part of the motive means being connected with another prop, so that upon retracting the one prop and advancing the same by the motive means connected therewith, such one prop may be extended once more for the engagement with the mine roof and the other prop can be retracted, then advanced with the motive part to which the same is connected, followed by extension of such prop once more.
  • the frame unit 39a includes frames 29a and 37a interconnected via the motive means 33a with control block 1a having the adjustable short-time clock-work or similar mechanism 2a situated therein for achieving the time sequence automatic control of the valve means in question as discussed more fully in connection with the operation of the control block of FIG. 1.
  • Frame 29a contains base 28, preferably of resilient material so that the same may accommodate unevenness in the mine floor, as well as a pair of upright props 30 attached to base 28, and preferably with a roof cap (not shown) interconnecting their upper ends in the conventional manner.
  • the motive means 33a contains the double-acting piston (not shown) carried by the piston rod 32 and the double-acting cylinder 34 through the ends of which the corresponding ends of the piston rod 32 extend.
  • piston rod 32 are connected by straps 31 with base 28 while cylinder 34 is connected by straps 35 with base 36 of frame 37a.
  • Frame 37a contains props 38 extending upwardly from base 36, preferably provided with a roof cap (not shown) in the same manner as props 30.
  • frames 29a and 37a are similar in construction, with the props 3t and 38 being of the usual type, utilizing the hydraulic jack principle to extend and retract such props for engaging and retracting the same from engagement with the mine roof thereabove, i.e., either directly or through the intermediary of an appropriate roof cap disposed thereat.
  • the bases 28 and 36, but also the straps 31 and 35 are made of resilient material to permit the same to be deformed somewhat in order to allow the individual prop frames and the composite prop unit 39a to accommodate unevenness in the mine floor and the mine ceiling.
  • an automatic cycle may be used to accomplish the six above-mentioned steps for advancing a prop unit composed of a pair of prop frames interconnected by a motive means, such as a double-acting piston cylinder arrangement.
  • a motive means such as a double-acting piston cylinder arrangement.
  • the construction of such an arrangement is conventional as may be appreciated, for instance, from a study of the aforementioned US. Patents 3,192,722, 3,174,289, and 3,186,179.
  • the timer device of the present invention may be a spring operated clockwork or an electrically operated motor, or the like.
  • more than one prop frame unit may be advanced automatically successively or simultaneously, whereby to reduce the total time of setting up the arrangement for a particular further sweep of the mining machine in question along the mine face being worked.
  • the mining prop units 3912, 39c, 39d, and 39e are provided as a group with unit 39a, each having an appropriate timer device in the form of a control block 1b, 1c, 1d, and 1e respectively, as well as an appropriate motive means in the form of a double-acting piston cylinder arrangement interconnecting the adjacent prop frames, for instance as shown by motive means 33!) and prop frames 29b and 37b of prop frame unit 39b.
  • the appropriate adjustable short-time clockworks 2a, 2b, 2c, 2d, and 2e of the corresponding control blocks are operatively interconnected in the embodiments shown in FIG. 2 for successive actuation of the prop units, one after the other, utilizing the preferred arrangement of Bowden cable connections discussed with regard to FIG. 1 above.
  • the Bowden cables 13a, 13b, 13c, and 13d operatively interconnect the corresponding clockworks so that upon the particular sweep hand 4 of a previous clockwork reaching the end position stop, the oblique surface of such sweep hand will push via the appropriate pushpin the flexible cable adjacent thereto inwardly to cause the other end of such cable to release the locking means of the next successive clockwork on the next successive prop frame unit.
  • FIG. 3 An alternate embodiment of the present invention in FIG. 3 contemplates a successive or even simultaneous control of the switching means for the various timer devices of successively adjacent prop frame units (not shown) of a group meant to be controlled.
  • the cable 94 is appropriately mounted for longitudinal displacement and carries thereon a thickened portion or lu-g 95 which is meant to coact with an appropriate arm 97 or 98 of a control lever 96 used to actuate directly or indirectly the timer device of a particular prop frame unit.
  • control levers 96a-96d inclusive as containing control levers 96a-96d inclusive, respectively, the advancement of the prop units may be attained successively upon the longitudinal displacement in a downward direction, of cable 94, as viewed in the drawing, so that the lug 95 successively actuates control levers 96a-96d via the appropriate arms 98a- 98d inclusive, or in the opposite direction via arms 97a- 97d inclusive.
  • This alternate embodiment may include a plurality of separate cables 94 arranged to control a plurality of successive prop frame units, so that the first unit in each separate series may be actuated simultaneously, then the next, and so on, until the last prop frame unit in each group is actuated.
  • first, eleventh, twenty-first, thirty-first, etc., prop frame units in the series may be actuated simultaneously by an appropriate switching means of the type shown in FIG. 3 upon displacement of cable 94 to bring the adjacent lug 95 into controlling contact with the control levers of the first, eleventh, twenty-first, thirty-first, etc., prop frame units.
  • prop frame units may be advanced, and so on, in succession, until the last set of prop frame units has been actuated.
  • Suitable means conventional in the art, may be used to prevent the further displacement of cable 94 and lu-g 95 until the completion of the advancement cycle of a previous prop frame unit, i.e., before the next prop frame unit in succession is to be actuated and advanced.
  • Better control over the operation is attained thereby and in the event of an unsuccessful advance, the reasons for the mishap may be ascertained more readily.
  • a prop frame which includes the upright props 41 and 42 interconnected by the resilient base strap 44 and the roof cap 43.
  • Frame 40 is similar in construction to the individual prop frames shown in FIG. 2 and the props utilize the hydraulic jack principle to change their effective length whereby to extend such props and in turn the roof cap into engagement with the mine roof and retract such props and in turn the roof cap from engagement with the mine roof.
  • an appropriate second frame (not shown) is used with frame 40, such frames being interconnected by a suitable motive means, such as a piston cylinder arrangement of the type utilized in the construction of FIG. 2, whereby the resulting prop frame unit may be advanced in the desired way.
  • control block 45 which may be manually operated by the handle 49 and which may be operated automatically in accordance with the present invention, in this case by remote control.
  • control block 45 is operatively connected with a servomotor of the conventional type within servo-motor housing 46, the control block and timer device being controlled by the pulse signal receiving wireless device or transistor receiver 47 having the antenna 48, such receiver 47 operating in dependence upon signals received from a pulse signal transmitting wireless device 50 remote from the prop frame unit as seen in FIG. 5.
  • Transmitting device 50 contains an actuating button 51 to send the signal via the antenna 53, with appropriate dials 52 being provided to select a predetermined frequency for governing a particular receiver 47 tuned to such particular frequency.
  • receiver 47 Upon receiving a signal from the trans mitting device 50, receiver 47 energizes an electromagnet 54.
  • the armature 55 pivoted about point 56 is displaced to cause in turn the balance wheel brake 57 to disengage the adjacent balance wheel, so that fork 58 at the free end of such balance whee-l can urge against teeth 59 of the timing mechanism wheel 60 disposed on the shaft 61 to cause rotation of such shaft.
  • Shaft 61 contains a small gear wheel 62 which operatively engages the large gear wheel 63 on shaft 64.
  • roller 65 disposed on shaft 64 such that projections 66, 67, 68 and 69, or other cam means, will engage operatively the rocker levers 70, 71, 72 and 73, respectively, mounted on rod 74, or other follower means, whereby to cause the pistons 75, 76, 77, and 78, respectively, to be displaced within low pressure valves 79, 80, 81 and 82 operatively connected via flow lines 83, 84, 85 and 86 with the servo-motor (not shown) within housing 46.
  • the servo-motor In response to pressure actuation via a given flow line, the servo-motor in turn causes corresponding movement of member 87 which appropriately controls the flow of pressure fluid, entering control block 45 through conduit 88, into the appropriate branch 'lines 90, 91, 92 and 93 for effecting prop unit advancement.
  • the movement of member 87 also governs the return flow, respectively, from lines 90, 91, 92 and 93 through control block 45 and out via conduit 89.
  • Conduits 88 and 89 may be connected in the conventional way with a pressure fluid reservoir.
  • the pressure fluid in this instance as well as that contemplated in the operation of the units shown in FIG. 2 may be hydraulic or pneumatic, both such systems being contemplated by the terminology used in the instant specification and accompanying claims.
  • the transmitter 50 may be portable in nature, and thus carried by the particular operator at a safe distance from the prop frame unit being controlled to advance the same. Transmitter 50 will thus be battery powered and may be cheap, light, and simple in construction. The same is true for receiver 47, since its purpose is only to energize a small electromagnet 54 upon receiving a signal from transmitter 50. The electromagnetic force is extremely small since this merely controls brake 57 for the timing mechanism, run by a spring such as a clockwork spring (not shown), operatively connected to shaft 64, whereby to rotate roller 65 and in turn cause actuation of the valve means.
  • a spring such as a clockwork spring (not shown)
  • a switch similar in operation to brake 57 may be used for controlling such motor, the motor being ener gized by the same different battery or other power source used for receiver 47 and/ or electromagnet 54.
  • Projections 66 to 69 are positioned to attain a predetermined sequence of valve control for predetermined intervals, appropriately with the complete cycle of advancement of the particular prop unit corresponding with a complete rotation (360) of roller 65.
  • Roller 65 may contain a preactive portion to achieve a preactive condition after brake S7 is released and prior to engagement of the first projection with the appropriate rocker lever to initiate the cycle of ordinal sequence of steps for advancing a given prop frame unit.
  • An audible or visual signal may even be provided near the particular prop frame unit being advanced, not only in connection with the embodiment of FIGS. 4 and S but also that of FIGS. 1, 2 and/ or 3, so that during any preactive interval, any workman nearby can be alerted to the automatic cycle which has been initiated to prevent mishap.
  • the timer device including a control block may be switched from inactive to active position automatically from a remote point or manually by a workman at the immediate site of the unit being advanced, with an appropriate time delay or preactive period during which such operator can remove himself, such that the advancement may take place automatically and in proper sequence.
  • the individual steps or movements of the props with respect to the mine roof and with respect to one another may take place in a cycle allocating a predetermined, yet adjustable, period of time for the completion of such individual movement or step, to attain a more efiicient advance of prop frame units than has been possible with previous constructions, whether completely automatic, remote or manual in nature.
  • the operator is left with sufiicient time to devote to other duties, since upon actuating the switch lever at the control block for a particular prop frame unit, the automatic cycle for accomplishing the prop frame unit advance takes place, whereupon the operator can get set for the actuation of the next timer device. Furthermore, due to the preferred preactive delay period, the operator may remove himself from the immediate site of the prop frame unit, and preferably the timer device and control block for one particular prop frame unit may be situated on the next adjacent prop frame unit, so that upon initiation of the automatic cycle of advancement, the operator is already removed from the danger area. In no case is it necessary for the operator to remain in the immediate vicinity of the advancing prop frame unit, as
  • a manually actuated control device of the conventional type it is advisable to provide along side the control block and/or timer device of the present invention whether remotely operated by Wireless means or not, a manually actuated control device of the conventional type.
  • This will permit not only emergency manual actuation of a particular prop frame unit but also an attentive manually activated correction control.
  • the operator may correct the situation by manually actuating the valve means to accomplish the incomplete advance or even to change the longitudinal position of the prop frame unit or to adjust the position thereof to attain a more secure support of the mine roof, i. e., depending upon the particular conditions met.
  • the timer device of the present invention can be constructed more simply and more cheaply than otherwise.
  • the timer device understandably need only be capable of performing properly during the normal automatic control cycle but not for more precise correction control which is necessary in practice as where there is an irregular development of the miner-a1, such as coal or rock, which requires more specific attention than is inherently impossible to achieve with automatic cycle advancement.
  • the central control from a remote distance is attained not by the use of control lines which may be damaged during the mining operations, but rather by wireless transmitting and receiving equipment.
  • wireless equipment is effective whether the distance of the transmitting equipment is near or far from the receiving equipment. Indeed, relatively short distances within the mineway, such as two or three hundred meters in length, are easy and inexpensive to accommodate with existing transmitting devices since the transmitter need only be very small to govern the operation at such a distance.
  • a portable transmitter may include its own current in the form of a battery and be conveniently carried by the operator, even where it is encapsulated for protection from fire-damp.
  • the operator thus may control a conventional frame unit from the direct vicinity thereof or else from a great distance away in order to bring about the advancement of the unit, and also a number of frame units in a group may be similarly actuated for advancement simultaneously or successively.
  • various receivers on selected frame units may 'be assigned different frequencies while others are assigned the same frequencies, so that simultaneous and/or successive actuation of the timer devices of such units may be attained in any given ordinal sequence in dependence upon the frequency selected for the transmitter and the receiving frequency of a particular receiver.
  • control block which may be utilized with the timer device may contain a servo-motor, controlled by the time switch and utilized for imparting power pulses to control the valve means and in turn the hydraulic pressure fluid flow necessary for the individual movements or steps to attain a complete cycle of advancement.
  • a wireless transmitter and receiver are employed rather than other switch ing means for attaining the active condition of the timer device, such as by manual control
  • the servo-motor and time switch or control block mechanism may be utilized as the important units for controlling the valve means and such elements may be individually replaceable for versatility in operation with a minimum of interruptions.
  • the timer device need only be small and primitive in construction provided the same is sufliciently dependable in operation, considering that the same need not itself directly actuate the control members or control valves for controlling the flow of hydraulic or pneumatic pressure fluid, since this may be accomplished by servo-motors of the conventional type and the like.
  • a given control block, timer device containing a servo-motor and the like should be assigned to each prop frame unit or to a plurality of prop frame units to be actuated simultaneously as a group.
  • each unit should be provided with its own manual switching control to accomplish minor adjustments or corrections in the positioning of the particular prop frame unit.
  • a brake or other releasable locking means is preferably associated with the timer device of the invention which may be released manually, via an electromagnet in response to a pulse or signal emitted from the transmitter as in FIGS. 4 and 5, or released by mechanical linkage means as in the case of the embodiment of FIGS. 1 and 2.
  • timer device of the present invention may take any form whatsoever although a convenient form is a spring operated short-time clockwork, possibly one having an idle initial movement or preactive condition before the active condition during which the cyclic automatic control in sequence of the valve means occurs to accomplish the advancement of a given prop frame uint or units.
  • a further embodiment of the time switch which may be utilized herein is a conventional laminated switch impeded, under constant dependence upon time, by the force of adherence of a flowing mass, in particular, a viscous mass such as dimethylpolysiloxane.
  • the switch is provided with a manually actuated switch lever arranged concentrically in the particular control block and which is placed under the action of a spring force and also connected via a free wheel with a brake for the timer device in such a manner that the lever or a pin thereon under impedence of the flowing mass controls the valve means for achieving the advancement of the unit.
  • a corresponding transmission means connected with such lever may achieve such control or a servo-control in the form of a servo-motor may be used which in turn controls operatively the valves to permit hydraulic fluid flow to and from the operative cylinders to achieve the retraction and extension of the prop and the longitudinal displacement of the motive means parts, such as a piston and a cylinder, with respect to one another.
  • a servo-control in the form of a servo-motor which in turn controls operatively the valves to permit hydraulic fluid flow to and from the operative cylinders to achieve the retraction and extension of the prop and the longitudinal displacement of the motive means parts, such as a piston and a cylinder, with respect to one another.
  • the rotation of the switch lever which is actually mounted on a rotatably positioned shaft in operative friction contact with the flowing mass, a more uniform and easier selection of individual switch functions is made possible, as compared with the use of an intermediate hydraulic linkage for actuating the particularly switching functions for the valve means.
  • a hydraulic delay member or flowing mass switch of the aforementioned type is used as timer device according to the invention, the advancement to zero position from the terminal position for initiating the pre-active and thereafter the active condition may take place automatically with suitable locking means preventing a repeat cycle.
  • a spring drive is used, the spring when run down may be recocked, e.g. by turning the lever in the same way as the sweep hand of FIG. 1 is turned to do this. The lever is thus brought back to its initial position, and the timer device is ready for renewed actuation upon release of the locking means therefor.
  • a particular advantage of the present invention is in utilizing remote control means which avoid the use of any wires which might be damaged during normal mining operations, thus reducing expenses which might be otherwise necessary.
  • the large number of control lines previously required to attain automatic advancement of prop frame units is avoided and in fact the manufacturing costs for attaining the automatic cycle control amount to about /2 to of the costs needed heretofore.
  • the comparatively slight amount of energy necessary for operating the receiver, timer device, servo-motor, etc., can be readily obtained from a simple electric battery for long periods of time before recharging of the battery is necessary.
  • the timing mechanism utilized does not need much power for controlling the pulses or other mechanical or electrical responses which it must provide in order to set the working of the particular valve means, the same will also be able to utilize the power source of the receiver.
  • the timer device actually will only control a servo-control, e.g., a servo-motor and linkages, or some similar interposed device which acts in turn to control the flow of hydraulic or pneumatic fluid through the valve means to accomplish the advancing steps.
  • a servo-control e.g., a servo-motor and linkages, or some similar interposed device which acts in turn to control the flow of hydraulic or pneumatic fluid through the valve means to accomplish the advancing steps.
  • the timer device, wireless receiver, servocontrol, e.g., servo-motor, and the like are preferably independent structural units which can be combined in the foriri of the control block, such as that shown in FIGS. 4 and 5, in the preferred embodiment together with a manual control for the valve means so that versatility in operations may be attained as well as individual replacement of any of the parts which wear out or become defective for any reason.
  • control block By providing the various coacting elements in a single device, i.e., a control block, such control block may be positioned as a compact member on a given prop frame whereby to control the advancement of that frame unit or the next adjacent frame unit, or for that matter a group of frame units simultaneously, in the even such frame units are cooperatively interconnected to accomplish this result, as the artisan will appreciate.
  • the transmission energy can also be stored directly in a conductor at various points along the mineway by attachment to lines which may be disposed therealong for this purpose.
  • the individual prop frame units can be controlled to achieve the step by step advance by the utilization of a cable means, such as that of FIGS. 2 and 3.
  • a cable means such as that of FIGS. 2 and 3.
  • means are provided to ensure that the controlled cycle of a prior timer device, in accordance with the present invention, must be complete before the next successive controlled cycle can be initiated to advance the next successive prop frame unit.
  • Suitable time control devices and/or devices which release locking means upon the prior timer device reaching its end position analogous to the arrangement shown in FIGS. 1 and 2, for instance, may be used to ensure that a given prop unit is not advanced prior to the desired time and to ensure an orderly sequence of advancement in a predetermined manner.
  • Coupled with the foregoing may be delay action or delay period conditions between the end of one controlled cycle for one prop unit and the start of the next controlled cycle for the next successive prop unit, whereby to ensure the safety of the miners who may be in the vicinity of the prop units being advanced.
  • the extent of axial displacement or longitudinal displacement of the cable will determine whether the respective prop units are being or have been advanced in the desired way.
  • the place of blockage of the cable can be readily ascertained and concomitantly the particular prop frame unit which has failed to complete the advancement cycle and which has thus prevented release of the locking means for initiating the advancement cycle of the next unit.
  • Such indications will make immediately aware to the operating personnel that a given unit has not properly carried out the step by step advancement operation and may not be in effective supporting engagement with the mine roof.
  • the defect may be easily ascertained, despite the fact that poor visibility or complicated operations would otherwise render the ascertainment of defects in the automatic advancement operation difiicult, especially in areas remote from the point of observation.
  • the use of a marked cable for this purpose is simple in construction and operation and extremely inexpensive to provide.
  • the use of marked cables may be of importance where the first, eleventh, twenty-first, etc. prop units are to be simultaneously advanced, and the second, twelfth, twenty-second, etc. are to be next advanced, and so on, since, for example, out of a possible 100 prop units being controlled, such units simultaneously by each cable, the effective operation of a particular unit may be ascertained by the lack of further movement of the control cable caused by the aforesaid locking means so that the number of possibilities is narrowed immediately to 10, and thence by visual inspection or other means to the single unit which is defective in operation.
  • the particular cable may be rewound after the full displacement thereof for attaining the control of the advancement of all of the units in question.
  • the automatic sequence valve control means e.g., timer device, etc.
  • the automatic sequence valve control means may be provided as an additional compact control device on a preexisting prop frame unit already containing a manual switching control device to accomplish versatility in operation for advancement automatically and for controlling minor adjustments manually with a minimum of danger to the operating personnel.
  • the automatic sequence valve control device of the present invention may be utilized on any given type of prop support mechanism, including one containing a pair of prop frames interconnected by a piston-cylinder arrangement such as that shown in aforesaid U.S. Patent 3,192,722, as well as the prop frame unit arrangements of the other aforementioned U.S. patents, and even on the prop frame units disclosed in any and all of the prior art cited in the applications leading to all of the aforementioned patents.
  • a pair of prop means is connected for alternate advancement in a given longitudinal or linear direction and such advancement is normally carried out with a motive means having a first motive part connected with one prop means and another motive part connected with a second prop means, especially by way of a piston-cylinder arrangement with the piston connected to one prop means and cylinder connected to the other prop means.
  • prop means does not merely signify a pair of props having a base and a roof cap whereby to form a prop frame, but may signify a single extensible prop, such as one using the hydraulic jack principle, connected to each motive part, so that the one prop will move with the cylinder and the other prop will move with the piston.
  • a pair of such props may be utilized not in the form of the usual prop frame, of the type shown in FIG. 2 or 4, but rather with such props being connected for common displacement with the piston or the cylinder of the motive device, such as by connection with such piston or cylinder through a base means or a roof cap or through direct connection of each prop separately from the other with the cylinder itself or the piston itself.
  • a multiplicity of props may be carried in a frame or through an intermediate connection or directly with the cylinder itself or the piston itself to accomplish the roof support contemplated as well as the advancement steps in an automatic manner in accordance with the invention.
  • a piston-cylinder arrangement may include a normal cylinder as well as a normal piston in the form of a hollow piston rod within which a further piston rod is disposed such that the hollow piston rod forms an internal cylinder for such further piston rod.
  • first the further piston and a first prop means connected therewith may be advanced with respect to the remainder of the device, then the normal piston forming the cylinder for such further piston may be advanced with a second prop means connected therewith, and then the normal cylinder with a third prop means connected therewith may be advanced, as the artisan will appreciate.
  • Suitable fluid flow conduit arrangements may be utilized to advance any one of the three motive elements and the corresponding prop means connected therewith without also displacing either of the other two motive elements with their respective prop means, or may be utilized to attain movement of any two of the prop means with respect to the remaining one of the prop means.
  • the multiple number of individual prop means advanceable with respect to the remaining prop means is a matter of expediency and in any of these situations the automatic sequence valve control means of the present invention may be adapted to program a given cycle of prearranged ordinal sequence of control of appropriate valve means to attain the desired results.
  • a wireless transmitter and receiver may be used of the type found in factories, ofiices, etc., by which a roving person is paged. This is carried out by transmitting a signal or pulse from the transmitter device to a roving person in the area who carries a small frequency receiver on him which emits a buzzing sound or signal when being called.
  • Such small receivers are capable of response over a sufiicient range, are light, relatively cheap, and simple in construction.
  • the sole function of such receiver is to control an electromagnet which actuates the buzzer or other signal.
  • a simple battery of the dry cell type may be used in the receiver for the actuation and for powering the receiver itself.
  • the small electromagnet is used in the same way, upon a signal being received by the receiver, whereby to start the mechanism of a clockwork or some other mechanism which initiates the automatic cycle for achieving control of the advancement steps.
  • the electromagnet may actuate a brake to start and stop the timer, either through the starting and stopping of an electric switch where the timer is electrically operated or to start the release of a coil spring where the clockwork or analogous mechanism is spring operated.
  • the timer power is via a manually cocked spring and in the other case the power to drive the electric clock mechanism may be obtained from the same battery used to operate the receiver and the electric magnet.
  • Timers of the type contemplated herein are very simple, mass-produced items, such as the clock mechanism in a wind-up alarm clock or a wind-up timer of short duration (e.g., one to five minutes), or in a simple electrically operated kitchen clock.
  • the cost factor of such a mechanism is indeed slight.
  • the simplicity in construction of a timer, receiver, servo-control, or the like, for operating the valve means for the advancement steps lends itself to the use of these elements in a very compact single package, such as a control block, permitting easy replacement of the parts and ready substitution of one package for another on a given prop unit.
  • the preferred embodiment contemplates the use of wireless remote transmission and receiving means, although a mechanical cable actuation, such as that shown in FIG.
  • the coupling of the individual timer devices may be achieved by electrical means, as the artisan may readily appreciate, even simpler in constructional arrangement than the mechanical means shown.
  • An alternative form of advancement is to connect a number of receivers to the same antenna laid along the mine face so that the transmitted signal may be received simultaneously at all of the receivers connected to such antenna to attain the simultaneous advancement of the respective prop units associated therewith.
  • a more versatile control will be achieved by adjusting the frequencies of the transmitters to the frequencies of the receivers to be controlled.
  • a particular transmitter used to control a specific prop unit or group of prop units may be adjusted to the predetermined frequency to which the receiver or receivers for such specific prop unit or group of prop units has been previously set.
  • An advanceable mining prop arrangement with hydraulically actuatable motive means, motive valve means controlling such motive means, each prop being hydraulically actuatable to change the effective length thereof for alternate extension into and retraction from supporting engagement with the mine roof and mine floor upon hydraulic actuation, in combination with automatic sequence valve control means operatively connected with said motive valve means, said sequence valve control means being separately positioned at a remote distance from such prop unit sufficiently to permit switching of said sequence valve control means without danger to the operator from the resultant changes in condition of said prop unit and the mine roof area being supported thereby, said control means so combined with timing means as to operate them in an automatic timed cycle operation.
  • An advanceable mining prop arrangement with hydraulically actuatable motive means, motive valve means controlling such motive means, each prop being hydraulically actuatable to change the effective length thereof for alternate extension into and retraction from supporting engagement with the mine roof and mine floor upon hydraulic actuation, in combination with automatic sequence valve control means operatively connected with said motive valve means, said control means so combined with timing means as to operate them in an automatic timed cycle operation, said timing means including an automatic timer device which when switched from inactive to active condition passes through a timed cycle to control the actuation in turn of said valve means in the required sequence.
  • said timer device includes a preactive condition of preset duration upon being switched from said inactive condition and prior to attaining said active condition as a safety delay period to permit the operator time to leave the immediate prop unit site before the resultant changes in condition of said prop unit and the mine roof area being supported thereby occur upon said timer device attaining said active condition.
  • said timer device includes a control block provided with a dial face having an active portion containing valve means switch contacts ordinally positioned thereon operatively connected with said valve means to control the corresponding hydraulic flow therethrough, and a sweep hand switch contact which upon being switched from said inactive condition is movable from a starting position initially through a preactive portion of said dial for attaining said preactive condition of preset duration and then through said active portion of said dial in contact for predetermined intervals in time-controlled sequence ordinally with said contacts to actuate said valve means, whereupon said sweep hand switch contact reaches a terminal position of inactive spent condition.
  • said cable means includes a displaceable cable which is provided with a lug thereon positioned for travel along a path into which said releasable locking means are situated in succession such that upon actuation to displace said cable said lug trips said locking means in succession to release the respective sweep hand switch contacts for carrying out the advancing of each prop unit respectively in succession.
  • said cable means include separate axially displaceable and thrust sub-cables, each sub-cable respectively operatively interconnecting the control block of the timing device of a prior prop unit with that of the next prop unit in succession, one end of each such sub-cable being operatively situated at the terminal position of the control block of the timing device of a respective prior prop unit and in the path of the corresponding sweep hand switch contact thereof and the other end of such sub-cable being operatively connected with the locking means of the control block of the timing device of the next prop unit in succession for release of such locking means upon axial displacement of such sub-cable, such that upon switching the control block of the timer device of the first prop unit in succession from inactive to active condition for advancing said first prop unit and in turn upon the sweep hand switch contact thereof reaching the corresponding terminal position, such sweep hand switch contact will strike said one end of the corresponding sub-cable between the first prop unit and the next prop unit in succession to cause axial displacement of such corresponding sub-cable and in turn
  • said automatic timer device includes a drive linkage operatively connected with displaceable cam means, and cam actuatable response means operatively connected with said valve means to control the corresponding hydraulic flow therethrough, said drive linkage, upon switching said timing device from inactive to active position, being energizable to displace said cam means, and wherein said response means includes follower means positioned in the path of displacement of said cam means for actuation thereby to control said valve means.
  • said drive linkage includes rotatable gear means
  • said cam means include a rotatable shaft, having a plurality of cams thereon of predetermined disposition, which is operatively connected with said drive linkage via said gear means for rotation thereby, said follower means being positioned in the path of said cams for appropriate actuation thereby for predetermined intervals in time controlled sequence in dependence upon the predetermined disposition of said cams
  • said response means includes a servo-motor operatively connected with said follower means to control said valve means in response to the actuation of said follower means by said cams
  • brake means are provided for switching said drive linkage from inactive to active condition, such that upon being switched to active condition, said drive means is able to rotate said shaft via said gear means and actuate said servo-motor via said follower means for predetermined intervals in time controlled sequence ordinally.
  • remote control means are operatively connected with said brake means to actuate said brake means for switching said drive linkage from inactive to active condition and in turn from active to inactive condition.
  • said remote control means include a pulse signal transmitting wireless device remote from such mining prop arrangement and a pulse signal receiving wireless device operatively connected with said brake means for actuating said brake means in dependence upon the pulses received.
  • An advanceable mining prop arrangement which comprises an advanceable mining prop unit including first means having at least one prop and second means apart from said first means and prop and operatively inter connected with said first means and prop for alternate advancement therewith via hydraulically actuatable motive means, motive valve means controlling the actuation of such motive means, said prop being hydraulically actuatable to change the effective length thereof for alternate extension into and retraction from supporting engagement with the mine roof and mine floor upon hydraulic actuation, and prop valve means, in combination with automatic sequence valve control means operatively connected with said motive valve means and prop valve means for regulating the corresponding hydraulic flow therethrough in predetermined ordinal sequence and for predetermined intervals in an automatic cycle operation, said sequence valve control means being separately positioned at a remote distance from such prop unit sufficiently to permit switching of said sequence valve control means without danger to the operator from the resultant changes in condition of said prop unit and the mine roof area being supported thereby.
  • supplemental manual switch means are provided in operative association, separately from said sequence valve control means, with said motive valve means and said prop valve means.
  • sequence valve control means include an automatic timer device which when switched from inactive to active condition passes through a timed cycle to control the actuation in turn of said valve means in the required sequence.
  • An advanceable mining prop arrangement which comprises an advanceable prop unit including hydraulically actuatable motive means having a first motive part and a second motive part operatively interconnected for back and forth alternate longitudinal displacement with respect to each other upon corresponding alternate hydraulic actuation, motive valve means controlling such alternate hydraulic actuation, prop means including a first prop connected to said first motive part for longitudinal displacement therewith and a second prop connected to said second motive part for longitudinal displacement therewith, each said prop being hydraulically actuatable independently of the other to change the ef fective length thereof for alternate extension into and retraction from supporting engagement with the mine roof and mine floor upon corresponding alternate hydraulic actuation, and first prop valve means for said first prop and second prop valve means for said second prop correspondingly controlling such alternate hydraulic actuation, in combination with automatic sequence valve control means operatively connected with said motive valve means, first prop valve means and second prop valve means to actuate said valve means for regulating the corresponding hydraulic flow therethrough in predetermined ordinal sequence and for predetermined intervals in an automatic cycle operation, said sequence valve control means
  • sequence valve control means are separately positioned at a remote distance from said prop unit suflieient to permit switching of said sequence valve control means without danger to the operator from the resultant changes in condition of said prop unit and the mine roof area being supported thereby.
  • sequence valve control means include an automatic timer device which when switched from inactive to active condition passes through a timed cycle to control the actuation in turn of said valve means in the required sequence.
  • said timer device includes a preactive condition of present duration upon being switched from said inactive condition and prior to attaining said active condition as a safety delay period to permit the operator time to leave the immediate prop unit site before the resultant changes in condition of said prop unit and the mine roof area being supported thereby occur upon said timer device attaining said active condition.
  • said timer device includes a control block provided with a dial face having an active portion containing six valve means switch contacts ordinally positioned thereon operatively connected with said valve means to control the corresponding hydraulic flow therethrough, and a loaded spring operated sweep hand switch contact which upon being switched from said inactive condition is movable under the operative force of said spring from a starting position initially through a preactive portion of said dial for attaining said preactive condition of preset duration and then through said active portion of said dial in contact for predetermined intervals in time controlled sequence ordinally with the first contact to actuate said first prop valve means for retraction of said first prop, with the second contact to actuate said motive valve means for displacement of said first motive part and first prop, with the third contact to actuate said first prop valve means for extension of said first prop, with the fourth contact to actuate said second prop valve means for retraction of said second prop, with the fifth contact to actuate said motive valve means for displacement of said second motive part and said second prop, and with the sixth contact
  • control block is resettable to the original inactive condition by return movement of said sweep hand switch contact to reload said spring to said starting position.
  • said cable means includes a displaceable cable which is provided with a lug thereon positioned for travel along a path into which said releasable locking means are situated in succession such that upon actuation to displace said cable said lug trips said locking mean in succession to release the respective sweep hand switch contacts for carrying out the advancing of each prop unit respectively in succession.
  • said cable means include separate axially displaceable and thrust sub-cables, each sub-cable respectively operatively interconnecting the control block of the timing device of a prior prop unit with that of the next prop unit in succession, one end of each such sub-cable being operatively situated at the terminal position of the control block of the timing device of a respective prior prop unit and in the path of the corresponding sweep hand switch contact thereof and the other end of such sub-cable being operatively connected with the locking means of the control block of the timing device of the next prop unit in succession for release of such locking means upon axial displacement of such sub-cable, such that upon switching the control block of the timer device of the first prop unit in succession from inactive to active condition for advancing said first prop unit and in turn upon the sweep hand switch contact thereof reaching the corresponding terminal position, such sweep hand switch contact will strike said one end of the corresponding sub-cable between the first prop unit and the next prop unit in succession to cause axial displacement of such corresponding sub-cable and in
  • said automatic timer device includes a drive linkage operatively connected with displaceable cam means, and cam actuatable response means operatively connected with said valve means to control the corresponding hydraulic flow therethrough, said drive linkage, upon switching said timing device from inactive to active position, being energizable to displace said cam means, and wherein said response means includes follower means positioned in the path of displacement of said cam means for actuation thereby to control said valve means.
  • said drive linkage includes rotatable gear means
  • said cam means include a rotatable shaft, having a plurality of cams thereon of predetermined disposition, which is operatively connected with said drive linkage via said gear means for rotation thereby, said follower means being positioned in the path of said cams for appropriate actuation thereby for predetermined intervals in time controlled sequence in dependence upon the predetermined disposition of said cams
  • said response means includes a servo-motor operatively connected with said follower means to control said valve means in response to the actuation of said follower means by said cams
  • brake means are provided for switching said drive linkage from inactive to active condition, such that upon being switched to active condition, said drive means is able to rotate said shaft via said gear means and actuate said servo-motor via said follower means for predetermined intervals in time controlled sequence ordinally, firstly to actuate correspondingly said first prop valve means for retraction of said first prop, secondly to actuate corresponding
  • remote control means are operatively connected with said brake means to actuate said brake means for switching said drive linkage from inactive to active condition and in turn from active to inactive condition.
  • said remote control means include a pulse signal transmitting wireless device remote from such mining prop arrangement and a pulse signal receiving wireless device operatively connected with said brake means for actuating said brake means in dependence upon the pulses received.

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  • Computer Networks & Wireless Communication (AREA)
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  • Control Of Position, Course, Altitude, Or Attitude Of Moving Bodies (AREA)
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US671896A 1965-01-21 1967-09-29 Automatic sequence cycle controlled advanceable mining prop arrangement Expired - Lifetime US3434389A (en)

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DEG0042622 1965-01-21
DEG42952A DE1201286B (de) 1965-01-21 1965-02-27 Rueckbarer hydraulischer Strebausbau

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3507122A (en) * 1967-10-18 1970-04-21 Bergwerksverband Gmbh Logical switching systems
US3661056A (en) * 1969-05-28 1972-05-09 Gullick Dobson Ltd Control systems for self-advancing mine roof supports
US3821880A (en) * 1970-08-04 1974-07-02 Gewerk Eisenhuette Westfalia Hydraulic control systems and devices therefor
US3866426A (en) * 1972-10-13 1975-02-18 Gewerk Eisenhuette Westfalia Tunnel driving apparatus
US4109472A (en) * 1976-01-24 1978-08-29 Dowty Mining Equipment Limited Longwall mining apparatus
US4643392A (en) * 1984-02-08 1987-02-17 Dobson Park Industries Plc. Valves
US4676698A (en) * 1984-02-08 1987-06-30 Hermann Hemscheidt Maschinenfabrik Gmbh & Co. Hydraulic valve control apparatus
CN101864975A (zh) * 2010-06-04 2010-10-20 中煤北京煤矿机械有限责任公司 后架变前架式连续支护超前支架及其移架方法
CN101871354A (zh) * 2010-06-04 2010-10-27 中煤北京煤矿机械有限责任公司 大步距连续支护式超前支架及其移架方法

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Publication number Priority date Publication date Assignee Title
GB2142074B (en) * 1983-06-21 1987-04-23 Dobson Park Ind Control of mine roof supports
DE102011012655B4 (de) * 2011-02-28 2015-09-24 Kruno Pranjic Verfahren zum Betrieb eines untertägigen hydraulischen Schreitausbaus
CN103114867B (zh) * 2013-02-22 2015-07-22 广州日滨科技发展有限公司 综采工作面液压支架和刮板输送机自动调直方法及系统

Citations (2)

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Publication number Priority date Publication date Assignee Title
US3207041A (en) * 1961-06-12 1965-09-21 Electro Hydraulics Ltd Hydraulically operated advancing roof support systems and monitoring systems therefor
US3285015A (en) * 1961-11-21 1966-11-15 Carnegie James Mining apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3207041A (en) * 1961-06-12 1965-09-21 Electro Hydraulics Ltd Hydraulically operated advancing roof support systems and monitoring systems therefor
US3285015A (en) * 1961-11-21 1966-11-15 Carnegie James Mining apparatus

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3507122A (en) * 1967-10-18 1970-04-21 Bergwerksverband Gmbh Logical switching systems
US3661056A (en) * 1969-05-28 1972-05-09 Gullick Dobson Ltd Control systems for self-advancing mine roof supports
US3821880A (en) * 1970-08-04 1974-07-02 Gewerk Eisenhuette Westfalia Hydraulic control systems and devices therefor
US3866426A (en) * 1972-10-13 1975-02-18 Gewerk Eisenhuette Westfalia Tunnel driving apparatus
US4109472A (en) * 1976-01-24 1978-08-29 Dowty Mining Equipment Limited Longwall mining apparatus
US4643392A (en) * 1984-02-08 1987-02-17 Dobson Park Industries Plc. Valves
US4676698A (en) * 1984-02-08 1987-06-30 Hermann Hemscheidt Maschinenfabrik Gmbh & Co. Hydraulic valve control apparatus
CN101864975A (zh) * 2010-06-04 2010-10-20 中煤北京煤矿机械有限责任公司 后架变前架式连续支护超前支架及其移架方法
CN101871354A (zh) * 2010-06-04 2010-10-27 中煤北京煤矿机械有限责任公司 大步距连续支护式超前支架及其移架方法
CN101864975B (zh) * 2010-06-04 2012-06-27 中煤北京煤矿机械有限责任公司 后架变前架式连续支护超前支架及其移架方法

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NL6600841A (de) 1966-07-22
BE675336A (de) 1966-07-19
DE1608504B1 (de) 1970-09-24
GB1111605A (en) 1968-05-01
FR1464327A (fr) 1966-12-30
DE1201286B (de) 1965-09-23

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