AU2005242116B2 - Electro-hydraulically controlled roof coal caving method and hydraulic support therefor - Google Patents
Electro-hydraulically controlled roof coal caving method and hydraulic support therefor Download PDFInfo
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00 O ELECTRO-HYDRAULICALLY CONTROLLIED ROOF SCOAL CAVING METHOD AND HYDRAULIC SUPPORT Z
THEREFOR
Technical Field of the Invention INDThe present invention generally relates to multipurpose roof coal caving and its support-debris shield equipment, and specifically relates to an electro-hydraulically controlled roof coal caving method and a hydraulic support therefor, used in the working r face of a multipurpose sub-level roof coal caving.
Back ground of the invention In China a utility model patent entitled "Automatic control roof coal caving support" was disclosed with a patent number of ZL 00213572.8 anl a publication number of CN 2420422 Y. The object of the invention is to provide a hydraulic support for electro-hydraulic program control sub-level roof coal caving; it includes electro-hydraulic program control system mounted on roof coal caving hydraulic support, pressure sensor mounted on legs, displacement sensor mounted on tail canopy cylinder and push-shift cylinder, approach switch mounted on retractable plate.
In China another patent application entitled "Technical method of raising exploitation efficiency in caving work face" was disclosed with a patent application number of 00110901.4 and a publication number of CN 1310 285A.The object of the application is to overcome the disadvantages of multipurpose ccoal mining process and roof coal caving hydraulic support, and provide reasonable roof coal caving technological parameters and high level automatic roof coal caving method, increase coal output and recovery rate, reduce number of operators, improve combined efficiency and reduce labor intensity by means of: 1. employing the modes of once blasting down after once cutting, cutting and blasting down of roof coal parallel operated multipurpose roof coal caving technology; 2. employing electro-hydraulic program control to perform a series of actions of roof coal caving support, realize automatic support shift, espe. ially blasting down of roof coal operation.
The electro-hydraulic program control roof coal cavin;g support in both said patents is the same support, disadvantages of which are: the retractable plate cylinder sensor of roof coal caving hydraulic support is a type of approach switch, that only can detect the extension and retraction of retractable plate, but can not measure and control the extension length of retractable plate, that is, can AH21(1262412_):MLW 00 not adjust the coal discharging opening size (size of door for passing caved coal), thereby
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can not meet the technological requirements to roof coal caving in different coal seam; it Salso has problem in relation to the inclination of top canopy in roof coal caving process, because top canopy has no inclination sensor, so it can not ensure .orizontal condition of top canopy of the support, thereby affecting the support debris shield stability.
Object of the Invention It is an object of the present invention to substantially overcome or at least Sameliorate one or more of the disadvantages of the prior art, or to at least provide a useful 0alternative.
Summary of the invention The present invention at least in a preferred embodiment provides an electrohydraulically controlled method, which employs an electro-hydraulically controlled roof coal caving hydraulic support, performs various roof coal caving operations through an electro-hydraulic control system of the support; in the electro-hydraulically controlled roof coal caving hydraulic support used by said method the operator can measure and control extension length of retractable plate, adjust coal discharging opening size, increase coal discharging control effect and adaptability to different coal seams, increase control modes of blasting down of roof coal, ensure horizontal condition of top canopy, increase support-debris shield stability; said method proposes suilable modes of blasting down of roof coal, regarding to different roof coal caving condition.
The present invention also provides an electro-hydraulically controlled roof coal caving hydraulic support specially used for said inventive method.
An aspect of the invention lies in a method for electro-hydraulically controlled roof coal caving, preferably including the following steps: employing a hydraulic support for electro-hydraulically controlled roof coal caving, or arranging an electro-hydraulic control system on a sub-level roof coal caving hydraulic support body, said electro-hydraulic control system includes: a support controller, an electro-hydraulic valve set, a leg pressure sensor, a push-shift cylinder stroke sensor, a tail canopy cylinder stroke sensor, an inclination sensor arranged on the top canopy, a retractable plate cylinder stroke sensor being cEpable of detecting the extension length of the retractable plate; sequentially connecting the support controllers of all supports in working face with main line cables or through isolation couplers to form a working net, and AH21(1262412_1):MLW 00 O simultaneously providing with necessary system attachment accessories, making the support controller in each support as a core unit so as to form a s-t of complete electro- Shydraulic control system for whole working face; the action to be performed by a single support program is controlled through program between various support controllers, thereby forming an automatic control of roof coal caving for the supports in groups; by IDmeans of setting different control parameters, changing set program of the support controller, different control modes of multipurpose roof coal caving can be selected, which control parameters may include: position of the support group, number of the Ssupports, action to be performed, action shift direction, etc.; based on the position variation of coal cutting of a coal mining machine, the support controllers of the electro-hydraulic control system give c mmands according to the predetermined program, the electro-hydraulic valve set perfonns the control, thereby makes the supports in working face automatically accomplish a series of actions in turn in terms of the program, which actions include: shifting supports, pushing forward front conveyers, blasting down of roof coal at the rear, pulling forward rear conveyers; the pressure sensor, stroke sensors and inclination sensor feed the action and condition signals back to the support controllers to provide basis for system control; the above said processes are periodically circulating so as to complete various operations of the supports of roof coal caving in working face; if necessary, manual intern!ene can be performed directly by an operator, in order to control a separate action of a single support or temporarily stop the whole system; wherein the operation of blasting down of roof coal, after the procedure of cutting coal and shifting supports, is carried out with a certain coal discharging step distance: 0.6m-1.6m; the basic coal discharging action of each support is: retracting a retractable plate to open a coal discharging opening--extending the retractable plate to close the coal discharging opening; or, retracting the retractable plate to open the coal discharging opening lowering and then raising a tail canopy-ex:tending the retractable plate to close the coal discharging opening, wherein: the lowing and raising of the tail canopy are performed repeatedly so as to form a swing of the tail canopy; the retracting retractable plate is variable, that is, the retraction length of the retractable plate can be varied in the range of 0-100% of its total extension lerngth, therefore the coal discharging opening size is adjustable; the coal discharging actions formed by a series of the automatic and sequential single actions of the tail canopy aad retractable plate are coupled together through the program control between various sur port controllers to form automatic shift actions of the supports in groups forming an automatic roof coal caving AH2 1(1262412_1):MLW Ssystem; different automatic coal discharging modes can be selected by means of changing c predetermined program of the support controllers, or selecting different coal discharging Z parameters; the coal discharging parameters to be selected including: the number of the supports with simultaneously opened coal discharging opening, lime and frequency to open the coal discharging opening of each support, the swing frequency of the tail IN canopy, extension length of the retractable plate; wherein the coal discharging modes are selected and performed with respectively different programs based on the degree of breakage of the roof coal correspondingly.
SAnother aspect of the invention lies in a hydraulic support for electro- 0 hydraulically controlled roof coal caving, specially used for the method as mentioned above, said hydraulic support preferably includes a sub-level roof coal caving hydraulic support body and an electro-hydraulic control system; the suppolt body includes: a top canopy, legs, a base, a debris shield canopy, a debris shield plat, a debris shield plate cylinder, a front conveyer push-shift cylinder, a rear conveyer pull.-shift cylinder; as well as a tail canopy, a tail canopy cylinder, a retractable plate, a retractable plate cylinder of a coal discharging mechanism; the electro-hydraulic control system includes: a support controller, an electro-hydraulic valve set, a leg pressure sensor., a push-shift cylinder stroke sensor, a tail canopy cylinder stroke sensor, a retractable plate cylinder sensor; wherein signal lines of the legs and various cylinders are respectively connected to signalinput terminals of the support controllers, hydraulic pipelines of the legs and various cylinders are respectively connected to flow-in and flow-out connection ports of the electro-hydraulic valve set; and wherein said retractable plate cyli :.der sensor is designed as a stroke sensor being capable of detecting and controlling the extension length of the retractable plate; an inclination sensor is mounted on the top canopy.
The present invention at least in a preferred embodiment employs the following technical measures: Said electro-hydraulically controlled roof coal caving method is preferably based on the following five points: 1. Employ electro-hydraulically controlled roof coal caving hydraulic support, or sub-level roof coal caving hydraulic support with electro-hydraulic control system mounted there on. The electro-hydraulic control system includes: support controller, electro-hydraulic valve set, leg pressure sensor, push-shift cylinder stroke sensor, tail canopy cylinder stroke sensor, top canopy inclination sensor, retractable plate cylinder stroke sensor which can measure extension length of retractable plate.
AH21(1262412_1):MLW
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00 oO 2. Sequentially connect support controller of all su]pports in working face N, with mainline cable or through isolation coupler to form a working net, and Zsimultaneously provided with necessary attachment accessories, making a unit utilizing support controller in each support as the core, to form a set of complete electro-hydraulic control system for whole working face. The action to be performed by a single support IND program is controlled through program between various support controllers, thereby forming automatic control of roof coal caving for grouped suppor:s; by means of setting different control parameters, varying set program of support controller, different control Smodes of multipurpose roof coal caving can be selected. The cont:ol parameters include: position of support group, number of supports, action to be performed, action shift forward direction, etc.
3. According to shift forward position variation cf coal cutting of coal mining machine, support controller of electro-hydraulic control system gives command based on a predetermined program, electro-hydraulic valve set perform this control, thereby making supports in working face according to program au'omatically accomplish a series of actions in turn, which actions include: support shift, pu:;h-shift front conveyer, blasting down of roof coal at rear portion, pull-shift rear cover; ressure sensors, stoke sensors and inclination sensors feed back the action and condition signals to the support controller, provide a basis for the system control. Said processes go round and begin again, move in cycles, to complete various operations of supports of roof coal caving in working face. If necessary, manual intervene can be performed by the operator, in order to control a separate action of a single support or temporarily stop Ihe whole system.
4. The blasting down of roof coal, after cutting coal bed and shifting support, is accomplished in accordance with certain coal discharging step distance and said coal discharging step distance is: 0.6m-1.6m. The basic roof coal caving actions of each support are: retract retractable plate to open coal discharging opening--extend retractable plate to close coal discharging opening; or retract retractable plate to open coal discharging opening--lower tail canopy and raise tail canopy--extend retractable plate to close coal discharging opening; wherein lowing and raising tail canopy is performed repeatedly so as to form swing of tail canopy; the retracting o: the retractable plate is variable for this invention, that is, retraction length of retractabk: plate can be varied in the range of 0-100% of its total extension length, coal discharginig opening size can be adjusted; a series of automatic-sequential single functional action:; of the tail canopy and retractable plate are coupled together to form coal discharging action, by means of the program control between controllers of various supports, in a large range an automatic AH21(1262412_I):MLW 00 Sshift forward action from support to support is accomplished ad thereby formed an Sautomatic roof coal caving system; by means of selecting diffi;rent coal discharging Zparameters or changing the predetermined program of the suppcrt controller, different automatic coal discharging modes can be selected; the coal discharging parameters to be selected including: number of supports with simultaneously opened coal discharging INDopenings, time and frequency to open coal discharging opening of each support, swing frequency of the tail canopy, extension length of the retractable plalte, etc.
Select and control roof coal caving modes: tt On the basis of degree of breakage of roof coal, the following three basic roof Ccoal caving modes are selected and controlled with different programs respectively: When roof coal is sufficiently broken, employ :;ingle cycle sequential stepped discharging caved coal, that is, keep tail canopy not moved, at first partially retract retractable plate, maxing retraction length of retractable plate equal 20%-100% of total extension length; while time for discharging caved coal reached of time for discharging caved coal of single support, fully retract retractable plate, after predetermined time for discharging caved coal is reached, fully extend retractable plate.
When roof coal is moderately broken, employ single cycle sequential stepped discharging caved coal, that is, at first fully retract retractable plate, while time for discharging caved coal reached (50±10)% of time for discharging caved coal of single support, control the tail canopy to swing repeatedly, after pcedetermined time for discharging caved coal is reached, raise tail canopy, extend retractable plate.
When the roof coal is hardly broken, employ c.ouble cycle sequential stepped discharging caved coal, that is, at first fully retract retractable plate, then operate, making tail canopy to swing repeatedly, after time for dischargirng caved coal of single support of first cycle is reached, raise tail canopy, extend retra.ztable plate; in second cycle of discharging caved coal, retract retractable plate, swing tail canopy, after predetermined time for second cycle is reached, raise tail canopy, e:xtend retractable plate; the coal discharging opening of second cycle is delayed than the coal discharging opening of first cycle no less than 10 supports.
Said three conditions of roof coal are determined before setting electro-hydraulic control program at first by manual operation, being based upon the determination of time for discharging caved coal in working face and upon the ob:;ervation of degree of difficulty of the roof coal caving, thereby devising the degree breakage of roof coal into: AH21(1262412_1):MLW 00 Roof coal is sufficiently broken: that means, when coal discharging is S, determined, keep tail canopy not moved, and only retractable pla:e is retracted, passing Z caved coal is very easy; Roof coal is moderately broken: that means, when coal discharging is determined, after retraction of retractable plate, passing caved coel is not very easy, but INO by means of cuing tail canopy, passing caved coal is success fully; Roof coal is hardly broken: that means, when coal discharging is j determined, through retraction of retractable plate and swing tail canopy can pass a Sportion of caved coal, but in presence of no blasting down of roof coal, roof coal could be Sfully discharged only by second cycle of blasting down of roof coal with interval of coal discharging time determined by 10-30 single supports.
Coal discharging time of single support: that means, bifore electro-hydraulic control program is set, coal discharging time of one support, determined manually in working face, or refers as predetermined coal discharging time.
In same or similar condition with adjacent working face, said degree of breakage of roof coal and coal discharging time of single support may be determined with reference to the adjacent working face.
The technical measures of at least in a preferred embcdiment of the present invention may be: The electro-hydraulically controlled roof coal caving modes may be grouped multi-opening balanced mode of coal charging, or stepped multi-cpening balanced mode of coal discharging, more over, the size of coal discharging open:ng can be adjusted by controlling the extension length of the retractable plate.
Electro-hydraulically controlled roof coal caving hydraulic support includes sublevel roof coal caving hydraulic support body and electro-hydraulic control system. The support body includes: top canopy, legs, base, debris shield canopy, debris shield plate and their cylinders, front and rear conveyers, push-shift cylinder and tail canopy, tail canopy cylinder retractable plate, retractable pale cylinder, etc. The electro-hydraulic control system includes: support controller, electro-hydraulic valve set, leg pressure sensor, push-shift cylinder stroke sensor, tail canopy cylinder st.'oke sensor retractable plate cylinder stroke sensor used to monitor and control extension length of retractable plate, inclination sensor additionally mounted on top canopy. Signal lines of legs and various cylinders are respectively connected with signal input terminals of support controller, hydraulic pipelines of legs and various cylinders are respectively connected with input and output port of electro-hydraulic valve set. Support c:ontroller is connected, AH21(1262412_1):MLW 00 O through expended solenoid valve driver, with electro-hydraulic valve set and provided with water-proof housing. Support body may employ two leg debris shield hydraulic Z support, or four leg support-debris shield hydraulic support. The coal discharging mechanism of the support may employ small retractable plate or large retractable plate or a swing type.
I\O The advantageous effects of at least in a preferred embodiment of the present invention are: Being based upon maintaining advantages of electro-hydraulic control i and sub-level roof coal caving hydraulic support, adds the functi.on of monitoring and 0 controlling extension length of retractable plate, adjusting size of coal discharging opening, thereby increasing control effect of discharging caved co l, adding a variability for electro-hydraulic control of blasting down of roof coal and adding control modes of blasting down of roof coal, improving adaptability of roof coal caving technology to roof coal condition in different working face.
Top canopy is provided with inclination sensor, which can ensure horizontal condition of the support's top canopy through the control of electro-hydraulic control system, thereby avoiding a forward inclination of suppo-t resulted by blasting down of roof coal and increasing support-debris shield stability of *he support, improving adaptability to environment of top seam. All these are beneficial to the high output with safety and high efficiency in multipurpose roof coal caving.
Brief description of the drawings A preferred form of the present invention will now be described, by way of example only, with reference to the accompanying drawings, wherein: Fig 1 is a schematic front view of the structure of electro-hydraulic support for multipurpose roof coal caving according to the present invention; Fig 2 is a schematic top view of base portion structure of Fig 1; Fig 3 is a schematic view of another structure of electro-hydraulic roof coal caving hydraulic support for multi-purpose roof coal caving according to the present invention; Fig 4 is a block diagram of electro-hydraulic control system of support; Fig 5 is a connection diagram between electro-hydraulic zontrol system support controller, solenoid valve driver and electro-hydraulic valve set; Fig 6 is a disposal and connection diagram of electro-hydraulic control system of roof coal caving hydraulic support in whole working face; in which: AH21(1262412_1):MLW 00 O List of Preference Numerals Z 1 Inclination sensor; 2 Leg pressure sensor; 3 Support controller; I\O 4 Retractable plate stroke sensor; Tail canopy store sensor; 6 electro-hydraulic valve set; S7 Push shift stroke sensor; 0 8 Rear leg pressure sensor; 9 Support controller rear socket; Solenoid valve driver; 11 Driver output jack; 12 Solenoid flack; 13 Front guide valve push rod knob; 14 Electro magnetic valve driver input jack; Isolation coupler; 16 Double way explosion proof electric supply box; 17 Bus lifter; 18 Network terminal; 19 Alternating current supply ling in working face; Main line cable; 21 Electric supply output cable.
Detailed Description of the Preferred Embodiments Now, the present invention will be described in combination with drawings and embodiments.
Description begins with electro-hydraulically controlled roof coal caving hydraulic support.
Embodiment 1: As shown in Fig 1, 2, the support of the present invention includes a support body and an electro-hydraulic control system. Support body is a two leg debris shield sublevel roof coal caving hydraulic support body, which includes: AH21(1262412_1):MLW 00 O top canopy, legs, base, debris shield canopy, balance cylinder, front connect bar, rear C connect bar, debris shield plate and debris shield plate cylinder, side debris shield plate Z and side debris shield plate cylinder, front conveyer push-shift cylinder, rear conveyer pull-shift cylinder, base raising cylinder, as well as tail canopy, tail canopy cylinder, retractable plate and retractable plate cylinder of coal discharge mechanism, etc.
\O An inclination sensor 1 is mounted on top canopy in front of legs, leg pressure sensor 2 is mounted on valve plate of lower cavity of leg hydraulic cylinder, electrohydraulic valve set 6 is mounted on base operation frame, support ;ontroller 3 is mounted Son main control valve of electro-hydraulic valve set 6, tail canopy stroke sensor 5 is mounted entail canopy hydraulic cylinder, retractable plate stroke :;ensor 4 is mounted on retractable plated hydraulic cylinder, push-shift stroke sensor is mounted on front conveyer push-shift hydraulic cylinder. Support controller 3, electro-hydraulic valve set 6, said five sensors as well as connection cable and teal form the support electro-hydraulic control system.
In Fig 4 the makeup of electro-hydraulic control system is shown. Said system employs a support controller 3 as a core, the system includes: a solenoid valve driver expended for support controller, five sensors 1, 2, 4, 5, 7 and a :;et of electro-hydraulic valves 6 as the periphery equipments of the support. A pressure sensor 2 is used to measure hydraulic pressure in lower cavity of legs, an inclination sensor 1 is used to measure top canopy inclination, three stroke sensors 7, 5, 4 are used to measure the strokes of respective push-shift cylinder, tail canopy cylinder and retractable plate cylinder. Electro-hydraulic valve set 6 is the execution unit of the control system, being a 9-unit-18 functional electro-hydraulic reversing valve set. Said 9-unit has the following control functions: Retracting and extending debris shield plate; Coal mining spraying-raising base; Retracting and extending side shield plate; Retracting and extending balance cylinder; Shifting support and push-shifting; Raising legs; Pull-shifting and shifting support-spraying; Lowing and raising tail canopy; Retracting and extending retractable plate, in which: push-shifting means push-shifting front conveyer; pull-shifting means pull-shift rear conveyer, see Tab 1.
AH21(1262412_1):MLW 00 Said electro-hydraulic control system can be the equipment and components of the electro-hydraulic control system "pm 31" from a German company Marco, The type, structure and principle of the equipment used in said support electro-hydraulic system can be: Support controller 3, also called main controller, is the type of pm \O 3.1/sg/c. It is a special mini control computer; its storage capacity is FLASH 512K, RAM 512K. Soft ware includes system program and application program. The deleting and loading application program may perform in working face in .i simple manner, this it provides convenience for modification and adjust meant of application program in-situ.
0Said controller has complete interface for man-machine interaction, provided with operation knobs, blocking emergency stop switch, 16 word code LED array display, various LED functional signal display and buzzers. Controller has input port, output port and communication port, corresponding to which connected are input jacks B2, C1, D1, D2, Bl, output jacks F2, El and communication jacks Fl, Al, A2. Wherein jacks C2, E2 are stand-by and need to block-off with special plugs.
electro-hydraulic valve set 6: It is the type OHE-210351 with a unit combination structure, integrated by 9 units, each unit has two hydraulic main control valves, corresponding to two solenoid guide valves and two solenoids. The main control valve and guide valve are both twoposition-three-way valves. When two main control valves of the same unit control the same hydraulic cylinder, respectively control its extension and retraction. Said support select 9-unit electro-hydraulic valve set, accomplish 18 control functions totally, so it called 18-functional electro-hydraulic inversing valve set. Action of solenoid guide valve rod of electro-hydraulic valve set, except depend on attraction of activated solenoid coil, also can be accomplished by pressing its push rod. External end of push rod is sealed by rubber sleeve for manual pressing. In power cut, failure of electric control system or other condition no use of electric control system, as a emergency operation, may directly press push rod, making guide valve activated. In Fig 5 front proposal of electro-hydraulic valve set 6 is shown, in which: S1-S9 is solenoid jack 12, corresponding to 1-9 unit of electrohydraulic valve set 6: number 1-18 is code of guide valve rod knob 13, corresponding to position of guide valve and solenoid: 1 st unit-up, 1 st unit-down, -9 h unit-up, 9 th unit-down of electro-hydraulic valve set, see Tab 1.
Solenoid valve driver 10: is the type of mcv/./d, connected between support controller 3 and solenoid valve set 6, is an expended attachment of support controller 3, it lead-in electric supply and control signal from support controller 3, AH21(1262412_1):MLW 00 O performing mission of turn-on and turn-off of each unit solenoid valve coil. As shown in N Fig 5, solenoid valve driver 10 has an input jack 14 eight output jack 11 (V1-V8), the Z number of valves, which can be driven is 8 units, i.e. 16 solenoids. Electro-hydraulic valve set is disposed into 9 units, employing all output ports 11 besides, from of put port El of controller 3 directly drive 9 th unit of electro-hydraulic; valve set.
N Leg pressure sensor 2: is the type of sns/dmd, used to measure hydraulic pressure in support leg cylinder, and is inserted in pressure measuring hole of leg for Smonitoring support and debris shield condition of support at real lime. Measuring range: 0-60MPa, sensor element is an electro-resistance-strain bridge, in the sensor a low-draft Samplifier is disposed for temperature compensation, so as to output electric analog signal.
Inclination sensor 1: is the type of sns/inc/c, used to monitoring horizontal condition of support top canopy, provides important parameters for system control process. Balance cylinder is provided with double direction blockage specially used for two leg supports, which can ensure horizontal condition of support top canopy, being based on inclination sensor signal through electric control sy;;tem program setting.
Push-shift stroke sensor 7: used to measure the amount of push-shift cylinder piston rod shift stroke.
Tail canopy stroke sensor 5: used to measure the amount of tail canopy cylinder piston rod shift stroke.
Retractable plate store sensor 4: used to measure the amount of retractable plate cylinder piston rod shift stroke.
Said three stroke sensors7, 5 and 4 are of the type sns/rs, measured amounts of stroke represent the positions of shifter, tail canopy and retractable plate respectively, which are important basis for control process. Stroke sensor an elongated tubular structure, with a diameter of 17.2mm, mounted in hydraulic cylinder, one end of which is fixed to end of hydraulic cylinder, and tube body is inserted into along hole, specially drilled in center of piston rod, with in tube body, along axial direction regularly arranged closely spaced resister array and main spring coil array, which are connected to form a network potentiometer circuit. In said piston a small ring of permanent magnet is encircled on sensor pipe and moving with the piston rod, the small ring of permanent magnet makes main spring coil contact closed at its reached position, which is corresponding to position reached by moveable arm of protection meter, the output value of network potentiometer circuit reflect stroke, it passes through amplifier in sensor, converted into electric current analog signal. The measurable stroke is determined by users. Resonation ratio is 3mm.
AH21(1262412_1):MLW 00 SIn Fig 4 and 5 the connection of main components of electro-hydraulic control system is shown. Input jacks B2, Cl, and Dl. D2. B1 of support controller 3 are Srespectively connected with inclination sensor 1, pressure sensc r 2, push-shift stroke sensor 7, tail canopy stroke sensor 5, retractable plate stroke sensor 4 though signal cable for incoming sensed signal. Output jack F2 of Support controller 3 is connected with NO input jack 14 of electro magnetic valve driver 10 through electric cable; and through 8 output jacks 11 (V1-V8) of solenoid valve driver 10 are respectively connected with solenoid jacks 12 (S -S8) of 1 st-8t unit of electro-hydraulic valve set 6. Output jack El of ltt support controller 3 is directly connected through electric cable wit.l solenoid jack 12 (S9) 0of 9 th unit of electro-hydraulic set6, i.e. of electro-hydraulic inversing valve, which control retractable plate cylinder.
The connection ports for flow-in and flow-out of hydraalic liquid of 14 main control valves of 1 st 3 rd 4 th 5 th 6 th 8 th 9 th unit of electro-hydraulic valve set 6 are respectively connected with flow-in and flow-out pipe of debris sh::eld plate cylinder, side debris shield plate cylinder, balance cylinder, push-shift cylinder, leg cylinder, tail canopy cylinder, retractable plate cylinder, thereby controlling their extens:.on and retraction. Two main control valves of 2 nd unit are respectively connected with coal mining spray valve, flow-in and flow-out pipe of base raising cylinder, thereby controlling coupled motion of coal mining spray and base raising; two main control valves of th unit are respectively connected with flow-in and flow-out pipe of pull-shift cylinder, support shift-spray valve, thereby controlling coupled motion of support shift-spray and pull shift. Besides, hydraulic control pipeline of coal discharge-spray valve and flow-in and flow-out pipe of tail canopy retraction cylinder or retractable plate retraction cylinder are connected in parallel, and controlled by one and the same main control valve, thereby performing coupled motion of coal discharge-spray and retraction of retractable plate cylinder or tail canopy cylinder.
Jacks Fl, Al of support controller 3 are used for connection between supports, respectively connected with controllers 3 of left adjacent and right adjacent support controller 3 directly by means of main line cable or through isolation copular 15, if it is an end support, a network terminal 18 for emergency stop is inserted in; in jack A2 of which a bus lifter 17 for raising voltage of bus may be inserted in; generally, bus lifter 17 is inserted, into isolation coupler 15, if coal position detecting unit is provided, its receptor is inserted in this jack, see Fig 6.
AH21(1262412_1):MLW 00 0 Embodiment 2 c In Fig 3, another configuration of hydraulic support of the present invention is Sshown. It is an electro-hydraulically controlled four leg support-debris shield sub-level roof coal caving hydraulic support. Four legs of which are arranged in front and rear row, no use of balance cylinder, pressure sensors 2, 8 are respectively nounted on valve plate \O in lower cavity of front and rear legs. Extension and retraction of front and rear legs of Ssupport are respectively controlled by two main control valves of 6 th unit and two main j control valves of 4 th unit. Signal input terminal of support controller 3 receives signal of t' top canopy inclination sensor 1, which passes from output jack F2 of support controller 3 Sthrough solenoid valve driver 10, electro-hydraulic valve set 6, to control extension and retraction of front and rear legs, thereby maintaining horizontal condition of top canopy.
When support controller 3 employs a non-water proof housing, it should be mounted on hinging bracket under support top canopy, solenoid valve driver mounted be hind hinging bracket. As shown in Fig 3, if water proof housing is employed, it can be mounted on operation frame of base, as shown in Fig 1. Other portions are the same as in embodiment 1.
The coal discharging mechanism of support body, except small retractable plate type coal discharging mechanism, mentioned in above two embodiments, also may employ large retractable plate type coal discharging mechanism, swing type coal discharging mechanism. Tail canopy and top canopy of large retractable plate type are hinged, two ends of tail canopy cylinder respectively hinged with tail canopy and top canopy. Swing type coal discharging mechanism includes coal discharge cylinder, small retractable plate cylinder, coal discharge swing plate and small retractable pale, two ends of coal discharge cylinder respectively hinged with coal discharge swing plate and base.
In this case, the small retractable pale, the small retractable plate cylinder and the coal discharge swing plate correspond to the retractable pale, the retractable plate cylinder and the tail canopy of the small retractable plate type coal discharging mechanism, respectively. Other portions are the same as in small retractable pl.te type.
Embodiment 3 Electro-hydraulically controlled roof coal caving method 3f the present invention includes following five parts of content: 1. Employ electro-hydraulically controlled roof coal caving hydraulic support, or sub-level roof coal caving hydraulic support with electro-hydraulic control system mounted there on. The requirements to electro-hydraulically controlled roof coal AH21(1262412_1):MLW 00 caving hydraulic support and electro-hydraulic control system are :he same as mentioned in embodiments 1, 2.
Z 2. Sequentially connect support controllers 3 of all supports in working face with main line cable 20, or through isolation coupler 15, to form internet, simultaneously provided with necessary system attachment, make support controller 3 in NO each support, as shown in Fig 5 as the core unit system to form a set of complete electrohydraulic control system for whole working face. In Fig 6, the disposal and connection of electro-hydraulic control system pm 31 for whole working face is shown, the indispensable system accessory for connection with electro-hydraulic control system pm 031 includes: Double way explosion proof electric supply box 16, Isolation coupler Bus lifter 17; Network terminal 18.
6-7 adjacent support controllers 3 in whole working face form a group, which is supplied by a line of independent electric supply of double way explosion-proof box, between groups a isolation coupler 15 is connected to cut-off electric connection between groups, to meet requirement of this ampere circuit, and perform data signal communication through photo-electric coupling. n# respectively represent 1 st 2 nd 3 rd (n-1)th, nth controller group, one group includes 6 or 7 controllers maximally. The mark of represents the start support. The explosion-proof electric supply box 16 converts alternating current of 90v-250v from electric supply line 19 in working face into double way direct current of 12v, supply for system pm 31 through electric supply output cable 21. On the basis of above mentioned e'ectro-hydraulic control system in whole working face, higher level proposal may be introduced: one is employ coal mining machine position detecting device, accomplish automatic support control, being based on coal mining machine position; another is add main control computer located in downstream groove, accomplish high level monitoring and controlling function.
Under the control of electro-hydraulic control system in whole working face, the action to be performed by single support program is controlled through program between various support controller thereby forming automatic control of grouped supports; that is an arbitrary number of successive adjacent supports, being set up as a group, making a certain single action or an automatic sequential coupled combined action automatically transferred from start support in certain program, support by suppcrt, until supports of this AH21(1262412_1):MLW 00 group complot this action. Note: automatic control grouping of grouped supports has conception other than conception of grouping of electric connection isolation. The Z automatic control of grouped supports performed through setting different control parameters: including position of group, number of supports, action to be performed, action for ward direction, etc., change set program of support controller 3, may select I\D different modes of multipurpose roof coal caving control.
3. The technological flow diagram in multipurpose working face is as follows: Coal cutting-support shift-push-shift front conveyer-coal discharging-pulltr shift rear conveyer. Get goal discharging technology as center, employ the modes of once 0blasting down of roof coal after once cutting, coal mining and coal discharging parallel machine following operation, also may employ the modes of twice: blasting down of roof coal after once cutting, or once blasting down of roof coal after twice cutting, stepped coal discharging parallel operation. Various operations to be )erformed by electrohydraulically controlled roof coal caving hydraulic support according to cutting for ward position of coal mining machine, support controller 3 gives command, being based on set program, electro-hydraulic valve, set 6 accomplish control, thereby making supports in working face according to program automatic-sequentially perfo:.m a series of actions, including: support shift, push-shift front conveyer, blasting down of roof coal at the rear, pull-shift rear conveyer, etc. pressure, displacement and inclination sensors feed back action and condition signal to support controller 3, thereby providing basis for system control said processes go round and begin again, move in cycls, to complot various operations of support roof coal caving in working face. If necessary, manual intervene can be adapted by direct manual action to control single action of single support, or temporarily stop whole system.
4. Blasting down of roof coal is the key operatioi in multipurpose roof coal caving technology, about 50%-70% caved coal is discharged from rear portion of support. The operation of blasting down of roof coal is performed in accordance with certain coal discharging step distance, coal discharge step distance is the most important technical parameter in coal discharge technology, which can be selected in the range of 0.6m- 1.6m, and moreover, it is generally a whole multiple number of cutting deepness of a coal mining machine.
Basic actions of the basting down of roof coal of each support are: Retracting retractable plate to open coal discharge opening:--extending retractable plate to close coal discharge opening; or retracting retractable plate to open coal discharge AH21(1262412_1):MLW 00 0 opening--lowing and raising tail canopy--extending retractable plate to close coal discharge opening, wherein Lowing and raising tail canopy is performed repeatedly so as to form swing of tail canopy; Retracting retractable plate, for the present invention it is a variable NO value, that is the retraction length of retractable plate can be vaied in the range of 0- 100% of foal extension length, the coal discharge opening size can be adjusted; a series of automatic-sequential single functional action of tail canopy and retractable plate coupled tt to form comminuted coal discharge action, through program contrcl between controllers 3 of various supports transferred automatically support by support in a wide grouped range, become grouped automatic blasting down of roof coal.
The coal discharge modes include very wide contents; the most important factor is coal discharge sequence and coal discharge frequency. Coal dis;harge sequence means those supports one follows another, or one interrupted from another; coal discharge frequency means single cycle, double cycle or multiple cycle. ]3y means of selecting different coal discharge parameters, changing the set program of support controller 3 different automatic coal discharge modes can be selected; the coEl discharge parameters to be select include: number of supports, which simultaneously open coal discharge opening, time and number to open the coal discharge opening, number of swing of tail canopy and extension length of retractable plea, etc.
Selection and control of coal discharge modes: E;ecause of difference in coal seam thickness in working face, degree of mine pressure appearance, hardness ratio and coal discharge step distance, its time for blasting down of roof coal, and degree of coal discharge difficulty also has difference. There fore, before setting electro-hydraulic control program, at first should select suitable coal discharge modes according to degree of difficulty of roof coal caving in working face, and degree cf breakage. Generally, following three modes of coal discharge are employed, and respectively accomplish control in accordance with different program: When roof coal is sufficiently broken, employ single cycle sequential stepped discharging caved coal, that is, keep tail canopy not moved, a: first partially retracts retractable plate, making retraction length of retractable plate equal 20%-100% of total extension length; while time for discharging caved coal reached 1/2 of time for discharging caved coal of single support, fully retract rftractable plate, after predetermined time for discharging caved coal reached, fully exterd retractable plate.
AH21(1262412_1):MLW 00 S(2) When roof coal is moderately broken, employ single cycle sequential stepped discharging caved coal, that is, at first fully retract retractable plate, while time for Sdischarging caved coal reached 1/2 of time for discharging caved coal of single support, control the tail canopy to swing repeatedly, after predeterminec time for discharging caved coal is reached, raise tail canopy, extend retractable plate.
IND When the roof coal is hardly broken, employ double cycle sequential stepped discharging caved coal, that is, at first fully retract retractable plat:, then operate, making tail canopy to swing repeatedly, after time for discharging caved coal of single support of Sfirst cycle is reached, raise tail canopy, extend retractable plate; in second cycle of discharging caved coal, retract retractable plate, swing tail canopy, after predetermined time for second cycle is reached, raise tail canopy, extend retraictable plate; in second cycle of discharging caved coal, retract retractable plate, swing tail canopy; the coal discharging opening of second cycle is delayed than the coal discflarging opening of first cycle no less than 10 supports.
Said three conditions of roof coal are determined before setting electro-hydraulic control program at first by manual operation, being based upor determining time for discharging caved coal of single support in working face, with observation of degree of roof coal caving difficulty, thereby devising the degree of breakagc. of roof coal into: Roof coal is sufficiently broken, that means, when discharging is determined, keep tail canopy not moved, only retractable plate is retracted, passing caved coal is very easy; Roof coal is moderately broken, that means, when coal discharging is determined, after retraction of retractable plate, passing caved coil is not very easy, but by means of swing tail canopy, passing caved coal is successfully; Roof coal is hardly broken, that means, wh:n coal discharging is determined, through retraction of retractable plate and swing of tail canopy, can pass a portion of roof coal, but in presence of no blasting down of roof coal, roof coal could be fully discharged only by second cycle of blasting down of roof ccal with interval of coal discharging time, determined by 10-30 single supports.
Coal discharging time of single support: that means, before electro-hydraulic control program is set, coal discharging time of one support, determined manually in working face, or refers as predetermined coal discharging time.
In the same or similar condition with adjacent working face, said degree of breakage of roof coal and coal discharging time of single support minay be determined with AH21(1262412_1 I):MLW 00 O reference to coal discharging time and degree of difficulty of blasting down of roof coal N, of adjacent working face.
ZExcept above mentioned three basic coal discharging r.odes, used in electrohydraulically controlled roof coal caving method, also may employ following modes, such as mode of grouped multi opening balance coal discharging, mode of stepped multi IND opening balance coal discharging, etc.
_The mode of grouped multi opening balance coal discharging: that means, balance the coal discharging group by group, making 10-20 suppo:rts as one group, select t 2-4 groups, each group has same number of supports, after pull-shifting supports, simultaneously open the coal discharging openings of first sup:ort of each group of supports, sequentially discharging caved coal in same direction. The coal discharging opening size can be adjusted by extension length of retractable plat-.
The mode of stepped multi opening balance coal discharging: that means coal discharging according to time gradient, step by step open 2-4 coal discharging openings in accordance with time order, coal discharging is circulated one by one, the set time for each coal discharging opening is equal, as select three coal discharging openings to open, when first coal discharging opening reaches 1/3 of predet:rmined time, open the second coal discharging opening, adjacent to the first coal discharEjng opening, and when the second coal discharging opening reaches 1/3 of predetermined time, open the third coal discharging opening, adjacent to the second coal discharging opening, when the third coal discharging opening reaches 1/3 of predetermined time. close the first coal discharging opening, simultaneously open the fourth coal discharging opening, and so on, to perform sequential coal discharging, from beginning to the end, always keep three coal discharging openings opened; as select 2 or 4 coal discharging openings to open, the operation sequence is the same. The coal discharging opening size can be adjusted by extension length of retractable plate.
As an example, in the multipurpose roof coal caving working face No. 4326 of the applicant of Xinglong zhuang coal mine of Yan kuang group, :he coal seam thickness is 8.6m, coal discharging step distance is 1.0m, cutting deepness of coal mining machine is 1.0m, employ technology once blasting down after once cutting, support shift, pushshift, blasting down of roof coal, pull-shift operation employ electro-hydraulically controlled roof coal caving method, and two types of electro-hydraulically controlled roof coal caving hydraulic supports of embodiment 1, 2 are used.
Technological flow diagram: coal mining machine ollowing coal cutting forward, ahead of front roll of coal mining machine at three supports take back support AH21(1262412_1 MLW 00 Sdebris shield plate, shift support delays coal mining machine 3-5 supports, push-shift front conveyer delays support shift 15-20 supports, coal discharge delays support shift Ssupport, pull-shift rear conveyer delays coal discharging opening 5-10 supports.
Coal discharging setting: before setting coal discharging program, at first perform manual determination coal discharging time of support in working face No.
,O 4326, with observation of degree of roof coal caving difficulty, through determination in said working face, coal discharging time of single support is 60s, At coal discharging process after retraction of retractable plate the passing of roof coal is not very easy, but by tt~ means of swing of tail canopy, passing roof coal is sufficiently, therefore, employ coal discharging program for moderate degree of breakage. Three modes of coal discharging are employed: single cycle sequential discharging, stepped multi openings balance discharging and grouped two openings discharging.
AH21(1262412_1):MLW Tab. 1 Function and makeup of the electro-hydraulic valve set Cnrl No. unit of No. guide miul Solenoid Driver Function obet used valve valve puhrd jack of out put set solenoid pu;h od valve set j ack Retr. debris Debris I ntu shield plate. shield I"t unit Ext. debris plate. from left I ntdw shield plate. cylinder Mining spray Coal 2 d unit-up 3 mining spray valve 2 ndunit 2V Raise base base. from left 2 n unit-down 4 Raise cylinder Retr. side3runtp shield plate Side shield 3d unit 33 unt-p3 Ext. side shield pl. cylinder from left 3r unit-down 6 plate Retr. balance h4Iuntp 7 cylinder Balance 4~ unit Sth unt-p4 Ext. balance cylinder from left t h unit-down 8 cylinder______ Shift support Shift 5 th unit 5 th unit-up 9 Push-shift cylinder from left 5 tIh unit-down 10 Lower legs Les 6 th unit 6 Ih unit-up 11S6V Raise legs left 6 tIh unit-down 12 Pull-shift Pull shift 7 th unit-up 13 cylinder 7 th unit Shift support support folet 7hun-dw 14S7 V7 -spray shift spray valve A1121(1262412_1):MLW 00 Loe al Tail 8 1h uni 8 h unit-up anopy c anp-ui S8 V8 Ras al cylinder folet 8 tIh unit-down 16 canopy Retr.
retractable. Rerca 9h 9 1h unit-up 17 Cn Plt.ble. Plate uni S9 troller Ext. from left retractable. cylinder 9 1h unit-down 18 jack: El Plate. AR2I(1262412_1):MLW
Claims (10)
1. A method for electro-hydraulically controlled roof coal caving, cZincluding the following steps: employing a hydraulic support for electro-hydrauilically controlled roof coal caving, or arranging an electro-hydraulic control system on a sub-level roof coal IDcaving hydraulic support body, said electro-hydraulic control system includes: a support controller, an electro-hydraulic valve set, a leg pressure sensor, a push-shift cylinder stroke sensor, a tail canopy cylinder stroke sensor, an inclination sc:nsor arranged on a top t canopy, a retractable plate cylinder stroke sensor being capable of detecting an extension 0length of a retractable plate; sequentially connecting a number of support con:rollers of supports in a working face with main line cables or through isolation couplers to form a working net, simultaneously providing with necessary system attachment accessories, making the support controller in each support as a core unit so as to form a set of complete electro- hydraulic control systems for whole working face; the action to be performed by a single support program is controlled through a program between various support controllers, thereby forming an automatic control of roof coal caving for the supports in groups; by means of setting different control parameters, changing set program of the support controller, different control modes of multipurpose roof coal caving can be selected, which control parameters may include: position of the support group, number of the supports, action to be performed, action shift direction; based on the position variation of coal cutting of a coal mining machine, the support controllers of the electro-hydraulic control system give commands according to the predetermined program, the electro-hydraulic valve set performs the control, thereby makes the supports in working face automatically accomplish a series of actions in turn in terms of the program, which actions include: shifting supports, pushing forward front conveyers, blasting down of roof coal at the rear, pulling farward rear conveyers; the pressure sensor, stroke sensors and inclination sensor feed the action and condition signals back to the support controllers to provide basis for system control; the above said processes are periodically circulating so as to complete various operations of the supports of roof coal caving in working face; if necessary, manual interlene can be performed directly by an operator, in order to control a separate action of a single support or temporarily stop the whole system; AH21(1262412_1):MLW 00 S- wherein the operation of blasting down of roof coal, after the procedure of cutting coal and shifting supports, is carried out with a certain coal discharging step Zdistance: 0.6m-1.6m; the basic coal discharging action of each ,:upport is: retracting a retractable plate to open a coal discharging opening--extending ihe retractable plate to close the coal discharging opening; or, retracting the retractable plate to open the coal IND discharging opening lowering and then raising a tail canopy-extending the retractable plate to close the coal discharging opening, wherein: the lowin:; and raising of the tail canopy are performed repeatedly so as to form a swing of the tail canopy; the t retracting retractable plate is variable, that is, the retraction length of the retractable plate can be varied in the range of 0-100% of its total extension length, therefore the coal discharging opening size is adjustable; the coal discharging action3 formed by a series of the automatic and sequential single actions of the tail canopy artd retractable plate are coupled together through the program control between various support controllers to form automatic shift actions of the supports in groups forming an automatic roof coal caving system; different automatic coal discharging modes can be selectedt by means of changing predetermined program of the support controllers, or selecting different coal discharging parameters; the coal discharging parameters to be selected including: the number of the supports with simultaneously opened coal discharging opening, time and frequency to open the coal discharging opening of each support, the swing frequency of the tail canopy, extension length of the retractable plate; wherein the coal discharging modes are selected and perfc'rmed with respectively different programs based on the degree of breakage of the roof coaL correspondingly.
2. The method according to claim 1, wherein the select and control of roof coal caving modes can be carried out in a way as follows: before setting an electro-hydraulic control program, the degree of breakage of roof coal is distinguishingly determined at first thrcugh manual operation, being based upon the determination of time for discharging caved coal in working face and upon the observation of degree of difficulty of the roof coal caving, in which the degree of breakage of the roof coal may basically relates to the following three conditions: the roof coal is sufficiently broken, that means, upon determining the coal discharging, the passing of the caved coal is very easy when keeping the tail canopy not moved and only the retractable plate being retracted; the roof coal is moderately broken, that means, upon determining the coal discharging, the passing of the caved coal is not very easy after retracting the AH2I(1262412_I):MLW retractable plate, but in case of swing the tail canopy, the passing of the caved coal is achieved successfully; the roof coal is hardly broken, that means, upon determining the coal discharging, a portion of caved coal can pass through retracting the retractable plate and swinging the tail canopy, but there is no blasting down of roof coal, the roof coal could be fully discharged only by a second coal discharging cycle spaci ag an interval of coal discharging time determined by 10-30 single supports; based on the degree of breakage of the roof coal, the following three basic coal discharging modes are selected and performed with different programs respectively: under condition that the roof coal is sufficiently broken, discharging the caved coal with sequential steps in a single cycle, that is, keeping the tail canopy not moved, partially retracting the retractable plate by making the retraction length of the retractable plate equal to 20%-100% of its total extension length, when the time period for discharging caved coal reached (50±10)% of the time for discharging caved coal of a single support, fully retracting the retractable plate; after a predetermined time period for discharging caved coal is reached, fully extending the retractable pate; under condition that the roof coal is moderately broken, discharging the caved coal with sequential steps in a single cycle, that is, fully r:tracting the retractable plate at first; when the time period for discharging caved coal re;ached (50±10)% of the time for discharging caved coal of a single support, controlling the tail canopy to swing repeatedly; after a predetermined time period for discharging icaved coal is reached, raising the tail canopy and extending the retractable plate; under condition that the roof coal is hardly broken, discharging the caved coal with sequential steps in two cycles, that is, in a first cycle, fully retracting the retractable plate at first, then making the tail canopy swing repeatedly, after the time period for discharging caved coal reached the time for discharging caved coal of a single support in the first circle, raising the tail canopy and extending the retractable plate; in a second cycle, retracting the retractable plate, swinging the tail canopy, and after a predetermined time period in the second circle is reached, raisi:ag the tail canopy and extending the retractable plate; the coal discharging opening of the second cycle is delayed at least 10 supports posterior to the coal discharging openi ag of the first cycle; wherein the above-mentioned time for discharging caved coal of a single support or predetermined time period for discharging caved coal is the coal discharging time of AH21(12624121):MLW 00 Sone support determined manually in working face before setting the electro-hydraulic control program; Z in case the condition is same or similar with an adjacent working face, said degree of breakage of roof coal and time for discharging caved coal of a single support may be determined with reference to the adjacent working face. INO
3. The method according to claim 1, wherein said coal discharging modes include grouped multi-opening balance mode, and the coal discharging opening size can be adjusted by controlling the extension length of the retractable plate.
4. The method according to claim 1, wherein said coal discharging modes 0include stepped multi-opening balance mode, and the coal discharging opening size can be adjusted by controlling the extension length of the retractable plate.
A hydraulic support for electro-hydraulically controlled roof coal caving, specially used for the method of claim 1, said hydraulic ,;upport includes a sub- level roof coal caving hydraulic support body and an electro-hydrajlic control system; the support body includes: a top canopy, legs, a base, a debris shield anopy, a debris shield plate, a debris shield plate cylinder, a front conveyer push-shift cylinder, a rear conveyer pull-shift cylinder; as well as a tail canopy, a tail canopy cylinder, a retractable plate, a retractable plate cylinder of a coal discharging mechanism; the electro-hydraulic control system includes: a support controller, an electro-hydraulic valve set, a leg pressure sensor, a push-shift cylinder stroke sensor, a tail canopy cylinder stroke sensor, a retractable plate cylinder sensor; wherein signal lines of the legs and various cylinders are respectively connected to signal-input terminals of the support controllers, hydraulic pipelines of the legs and various cylinders are respectively connected to flow-in and flow-out connection ports of the electro-hydraulic valve set; and wherein said retractable plate cylinder sensor is designed as a stroke sensor being capable of detecting and ccntrolling the extension length of the retractable plate; an inclination sensor is mounted on ihe top canopy.
6. The hydraulic support according to claim 5, wherein said support body is designed as two leg debris shield hydraulic support for roof coal caving; the horizontality of the top canopy is ensured by means of the extensi n and retraction of the balance cylinder through the controlling performed by the support controller and the electro-hydraulic valve set based on signals from the inclination sensor and the leg pressure sensor.
7. The hydraulic support according to claim 5, wherein said support body is designed as four leg debris shield hydraulic support for roof coal caving, the horizontality of the top canopy is ensured by means of the extension and retraction of the AH21(1262412_1):MLW 00 O front or rear leg through the controlling performed by the support controller and the N electro-hydraulic valve set based on signals from the inclination sensor and the front or [J rear leg pressure sensor.
8. The hydraulic support according to claim 5i, wherein said coal discharging mechanism is designed as a large retractable plate type coal discharging mechanism.
9. The hydraulic support according to claim 5, wherein said coal discharging mechanism is designed as a swing type coal discharging mechanism. A hydraulic support for electro-hydraulically con:rolled roof coal caving 0as hereinbefore described with reference to the description and the accompanying drawings. Dated
10 July 2008 Yanzhou Coal Mining Company Limited Patent Attorneys for the Applicant/Nominated P)erson SPRUSON FERGUSON AH21(1262412_1):MLW
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| CN200410036476A CN100593628C (en) | 2004-12-10 | 2004-12-10 | Electric hydraulic controlled caving coal method and it hydraulic supporter |
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-
2004
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-
2005
- 2005-12-06 AU AU2005242116A patent/AU2005242116B2/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102797485A (en) * | 2012-08-30 | 2012-11-28 | 南京石诚井巷装备有限责任公司 | Rotary accommodating platform for hydraulic support for fully mechanized mining for coal mine |
| CN103527225A (en) * | 2013-10-18 | 2014-01-22 | 南京石诚井巷装备有限责任公司 | Mining fully-mechanized coal mining face hydraulic support installation method |
| CN103527225B (en) * | 2013-10-18 | 2016-06-15 | 南京石诚井巷装备有限责任公司 | A kind of mining fully mechanized coal face hydraulic support installation method |
| CN106401621B (en) * | 2016-09-28 | 2018-07-27 | 山东科技大学 | A kind of hydraulic support Intelligent Installation machine and its application method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100593628C (en) | 2010-03-10 |
| AU2005242116A1 (en) | 2006-06-29 |
| CN1786420A (en) | 2006-06-14 |
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Free format text: THE NATURE OF THE AMENDMENT IS: AMEND THE INVENTION TITLE TO READ ELECTRO-HYDRAULICALLY CONTROLLED ROOF COAL CAVING METHOD AND HYDRAULIC SUPPORT THEREFOR |
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