CN102261972B - Experimental platform for relation between mining fully-mechanized support and surrounding rocks - Google Patents

Experimental platform for relation between mining fully-mechanized support and surrounding rocks Download PDF

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Publication number
CN102261972B
CN102261972B CN 201110097533 CN201110097533A CN102261972B CN 102261972 B CN102261972 B CN 102261972B CN 201110097533 CN201110097533 CN 201110097533 CN 201110097533 A CN201110097533 A CN 201110097533A CN 102261972 B CN102261972 B CN 102261972B
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China
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experiment
loading
timber
hydraulic support
surrounding
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CN 201110097533
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Chinese (zh)
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CN102261972A (en
Inventor
王家臣
杨胜利
闫保金
赵洪宝
潘卫东
刘颢颢
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中国矿业大学(北京)
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Priority to CN 201110097533 priority Critical patent/CN102261972B/en
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Abstract

The invention discloses an experimental platform for a relation between a mining fully-mechanized support and surrounding rocks. The experimental platform is used for researching an interaction relation between a hydraulic support in a mining fully-mechanized operating surface and the surrounding rocks. The platform comprises a loading experimental platform, a two-column shielding hydraulic support, a hydraulic loading system, a signal acquisition system and a data processing system, wherein the loading experimental platform comprises two experimental platform box body vertical grooves and a carrying bearing beam which is connected between the two experimental platform box body vertical grooves and used for paving an experiment material; and strain gauges are respectively embedded in different layers of the experiment material and used for monitoring the stress change of an overburden layer in a mining process. The experimental platform can load the overburden layer for complementing a ground stress. The two-column shielding hydraulic support is arranged on the operating surface and can perform real-time and on-line monitoring on loads of a top plate in the propelling process of the operating surface. The two-column shielding hydraulic support can realize high-frequency acquisition of support pressure signals and can monitor and record impact loads.

Description

Mechanized coal mining bracket and Relationship Between Face Supports And Surrounding experiment porch
Technical field
The present invention relates to a kind of mechanized coal mining bracket and Relationship Between Face Supports And Surrounding experiment porch, be used for the hydraulic support of research coal mine fully-mechanized mining working and the interaction relationship of country rock.
Background technology
Coal-face Roof Breaking and mobile pressing of forming are the processes of a complexity, on-the-spot distortion and the movement of generally controlling country rock in the stope by hydraulic support, therefore, colliery fully-mechanized mining support and Relationship Between Face Supports And Surrounding are the core contents of strata control around longwang face.Yet can only press Strata Behavior to estimate to roof toad and ore deposit by observation hydraulic support working resistance in the scene, be difficult to go deep into country rock inside structure and this dynamic process of structural instability that top board forms are observed.Though some scholars have carried out analog simulation experiment and numerical evaluation in the laboratory, but simulation and numerical result can only reflect stope strata movement and stress distribution, can not simulate support to the action effect of country rock, more can not determine the dynamic equilibrium relation of support and country rock.
Summary of the invention
The present invention proposes a kind of mechanized coal mining bracket and Relationship Between Face Supports And Surrounding experiment porch, this platform can be simulated mechanized coal mining bracket and Relationship Between Face Supports And Surrounding, the situation of change of Real-Time Monitoring working face extraction process medium-height trestle working resistance, rib and roof Stress field can intuitively be found out structure and structural instability form that roof strata forms simultaneously.
The present invention has taked following technical scheme.The present invention includes loading experiment platform, two column protected type hydraulic support, hydraulic loading system, signal acquiring system and data handling system, wherein: described loading experiment platform comprises that two experiment table casings found groove, are connected to the carrying joist that is used for laying experiment material between the vertical groove of two experiment table casings, different layers position in experiment material is all buried strainometer underground, in order to monitor the STRESS VARIATION of superincumbent stratum in the seam mining process.Described two column protected type hydraulic support is arranged on the carrying joist, and exploitation is used for the experiment material in simulation coal seam.Described hydraulic loading system comprises the loading back timber, is arranged in the loading hydraulic cylinder that loads on the back timber and loads backing plate, described loading back timber is connected between the vertical groove of two experiment table casings and can moves up and down along the vertical groove of experiment table casing, the loading surface of loading hydraulic cylinder acts on the experiment material by loading backing plate, and described hydraulic loaded cylinder is at least two.Described signal acquiring system comprises the strainometer that is arranged in the different layers position, be arranged in loading hydraulic cylinder and load LOAD CELLS between the backing plate, be used for gathering data acquisition system (DAS) and the data handling system of above-mentioned each sensor signal, and each sensor signal that data acquisition system (DAS) will gather sends data handling system to and processes.
Described two column protected type hydraulic support comprises lifting jack, pressure transducer, base, back timber, four connecting rods, rear tail boom and the back timber balanced structure that can stretch, wherein base, four connecting rods, rear tail boom and back timber are hinged successively, the two ends of described back timber balanced structure are fixedly connected with back timber with rear tail boom respectively, described lifting jack one end is fixedly connected with base, and the other end and back timber are hinged.
Between the acting surface of lifting jack and back timber pressure transducer is installed, sensor base is connected with the back timber bolt, and the sensor plush copper contacts with very heavy summit.
The vertical groove of described experiment table casing vertically equidistantly is distributed with horizontal through hole, and the two ends that load back timber are provided with horizontal through hole, and bolt passes horizontal through hole the two is fixed.
In terms of existing technologies, the experiment porch among the present invention can be realized superincumbent stratum is loaded, in order to stress addedly.Arrange the two column protected type hydraulic support at workplace, can be in the advance of the face process, roof toad carries out real time on-line monitoring.Two pillar shield supports can realize that high-frequency gathers the poppet pressure signal, and can monitor and record by impact loading.
Description of drawings
Fig. 1 is mechanized coal mining bracket and the Relationship Between Face Supports And Surrounding experiment porch schematic diagram among the present invention;
Fig. 2 (a) is mechanized coal mining bracket and Relationship Between Face Supports And Surrounding experiment porch front elevation among the present invention;
Fig. 2 (b) is mechanized coal mining bracket and Relationship Between Face Supports And Surrounding experiment porch side view among the present invention;
Fig. 3 is experiment porch hydraulic loading device schematic diagram;
Fig. 4 is two column protected type hydraulic support front elevation;
Fig. 5 is that the back timber balanced structure is formally schemed;
Fig. 6 is back timber balanced structure vertical view;
Fig. 7 is the formal figure of the bracket base in the two column protected type hydraulic support;
Fig. 8 is the vertical view of the bracket base in the two column protected type hydraulic support;
Fig. 9 is the formal figure of four connecting rods in the two column protected type hydraulic support;
Figure 10 is the vertical view of four connecting rods in the two column protected type hydraulic support;
Among the figure: 1, the loading experiment platform, 2, the two column protected type hydraulic support, 3, hydraulic loading system, 4, signal acquiring system, 5, data handling system, 11, the carrying joist, 12, load back timber, 13, the experiment table casing stands groove, 14, strengthen gusset, 15, the experiment table base, 16, the fixing boring of back timber, 17, the back timber set bolt, 21, load lifting jack, 22, LOAD CELLS, 23, bracket base, 24, back timber, 25, four connecting rods, 26, rear tail boom, 27, the back timber balanced structure, 28, rear tail boom side guard plate, 29, the back timber side guard plate, 30, four connecting rod contiguous blocks, 31, loading hydraulic cylinder, 32, the on-load pressure sensor, 33, load backing plate.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, the present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
The present invention is a kind of experiment porch according to the STRESS VARIATION in test bracket working resistance, superincumbent stratum loading force, rib and the top board in stope top board and the hydraulic support mechanism, utilize on the lifting jack and experiment porch on loading hydraulic cylinder on pressure transducer, and the foil gauge in coal body and the top board carries out the data Real-Time Monitoring, gathers and stores.
This platform can carry out following experiment: 1) can simulate different immediate roof conditions by this platform, the relation of working resistance of support and immediate roof rigidity; 2) the different basic tops of simulation conditions, structure and the structural instability form of the basic disrumpent feelings rear formation of rimrock piece, and the variation of roof toad when measuring structural instability; When 3) simulating different mining height, the STRESS VARIATION in the rib coal body and inclined to one side side form; When 4) simulating thin basement rock, tight roof, Sub-Level Caving specific condition, the relation of top board rigidity and support load.
Experiment porch among the present invention can Real-Time Monitoring advance of the face process medium-height trestle working resistance, the variation of stress in rib and the top board.To be arranged in stope with the two column protected type hydraulic support of pressure transducer, and in the analog material process of deployment, foil gauge will be arranged in the analog material of laying.Before the working face mining, the mechanical property on coal seam, immediate roof and basic top is measured.Along with the propelling immediate roof of workplace is emitted and is fallen the goaf, main roof is understood the disrumpent feelings of generating period, disrumpent feelings rear formation structure, and unstability occurs in structure again, periodically press thereby form, in digging process, implement STRESS VARIATION in the variation of monitoring working resistance of support, rib and the top board.Experiment is processed experimental data through data handling system after finishing, and draws Stress Field Distribution rule in mining active process medium-height trestle working resistance, coal body and the top board, and old top presses moment to the impact of support formation.In conjunction with to coal body, immediate roof and the parameters such as old top intensity, rigidity, study roof weighting mechanism, determine the roof toad evaluation method, instruct the hydraulic support type selecting, improve the Surrounding Rock Control level, guarantee mine safety mining.
Embodiment
As shown in Figure 1, the experiment porch among the present invention comprises loading experiment platform 1, two column protected type hydraulic support 2, hydraulic loading system 3, signal acquiring system 4 and data handling system 5 five parts.Two column protected type hydraulic support 2 is arranged on the loading experiment platform 1, and two column protected type hydraulic support 2 can be along with the advance of the face realizes moving horizontally on loading experiment platform 1.Hydraulic loading system 3 is arranged in the top of loading experiment platform 1.During experiment, lay successively from bottom to top coal seam and superincumbent stratum according to the analog material composition of coal seam composite columnar section and ratio of similitude configuration on the carrying joist 11, pressurize by 3 pairs of pavers of hydraulic loading system.In laying the model process, bury strainometer underground in the different layers position, in order to monitor the STRESS VARIATION of superincumbent stratum in the seam mining process.
The structure of two column protected type hydraulic support 2 such as Fig. 4~shown in Figure 10, comprise lifting jack 21, pressure transducer 22, base 23, back timber 24, four connecting rods 25, rear tail boom 26 and the back timber balanced structure 27 that can stretch.Wherein base 23, four connecting rods 25, rear tail boom 26 and back timber 24 are hinged successively, concrete annexation such as Fig. 7~shown in Figure 10, at bracket base 23 four the four connecting rod contiguous blocks 30 that are arranged in parallel, per two one group, on rear tail boom 26, also be provided with two four connecting rod contiguous blocks, four connecting rods 25 are four, its two ends respectively with bracket base and rear tail boom on four connecting rod contiguous blocks hinged.The two ends of back timber balanced structure 27 link by bolt with rear tail boom 26 and back timber 24 respectively, lifting jack 21 1 ends are fixedly connected with base 23, the other end and back timber 24 are hinged, between the acting surface of lifting jack 21 and back timber 24, pressure transducer 22 is installed, the base of sensor 22 is connected with back timber 24 bolts, the sensor plush copper is directly put with lifting jack 21 and is contacted, and sensor 22 sends the pressure signal that gathers to signal acquiring system.Two column protected type hydraulic support 2 is arranged in workplace, and by being built up in the high-frequency pressure signal sampler of lifting jack 21, the Real-Time Monitoring superincumbent stratum is to the acting force of support, and monitor signal enters data handling system by signal acquiring system.Hydraulic support is used for test job face recovery process superincumbent stratum to the acting force of hydraulic support.Two column protected type hydraulic support 2 is placed on the carrying joist 11, by the movement of manual control two column type hydraulic supports 2.Along with workplace is pushed, at first with lifting jack 21 releases, when can moving, two column protected type hydraulic support 2 just pushes ahead the two column protected type hydraulic support, assigned address to be moved to, again carry out before rising hydraulic pressure, move frame, workplace by pressure transducer 22 monitoring this moment and the working resistance of support of process such as press to change.
The signal that signal acquiring system 4 gathers on the sensor that is arranged between two column protected type hydraulic support 2, hydraulic loading system 3 and each layer position, and send data handling system to.The signal that wherein gathers comprises: working resistance of support signal, on-load pressure signal, coal body and roof Stress signal.Signal acquiring system 4 specifically comprises: be arranged in ZF (ZAM) 1000-2GB-CL8 (* *) N* high precision strainometer and the STSS-1 stress detection module of coal seam and superincumbent stratum, in order to monitor the variation of seam mining Coal During layer and superincumbent stratum internal stress; Be arranged in loading hydraulic cylinder 31 and load between the backing plate 33 and be arranged in CST-502 between two column protected type set cap 24 and the lifting jack 21 and press and use the radial LOAD CELLS, for the variation of monitoring loading force and shield [support working resistance.The external CST-502 sensor of sensor amplification module imports PC through the USB-7360A data collecting card with data line, carries out data with 7360 series of high speed drive softwares and processes, and each sensor signal that this equipment will gather sends data handling system to and processes.
When the experiment porch simulation fully mechanized mining supporter among employing the present invention and Relationship Between Face Supports And Surrounding, at first need on loading experiment platform 1, lay experiment material according to the ratio of similitude layering that calculates, bury simultaneously strainometer underground in the laying experiment material, with data line access signal acquiring system as shown in Figure 1, pass through in addition hydraulic loading system simulated ground stress as shown in Figure 3 on model top.After model lays, in the coal seam, excavate out open-off cut, and the two column protected type hydraulic support of inciting somebody to action as shown in Figure 4 is arranged in open-off cut, with pressure transducer 22 data lines on the lifting jack 21 with such as the data line access data capture card of loading system among Fig. 3, and data collecting card is connected into as shown in Figure 5 data handling system.The normal propelling of analog operation face after everything in readiness, the pressure in Real-Time Monitoring two column protected type hydraulic support and the loading system changes, and the stress and strain signal in rib, immediate roof, the basic top is gathered.Workplace continues propelling, and superincumbent stratum periodically fracture occurs and also forms structure, and form when the structure that observation forms and structural instability, and the displacement in the measurement superincumbent stratum moving process until hydraulic support is advanced to model boundary, are finished experiment.
After the model laying is finished, the mechanical property test is carried out in coal seam, immediate roof and the sampling of basic top, the data of storing in conjunction with experimental data processing system, research support are to the adaptability of top board, and the relation of definite roof toad and top plate thickness, intensity, rigidity etc.
The present invention is simple in structure, can effectively simulate fully-mechanized mining working support and the interactional relation of country rock, and compare with other analog simulation experiment tablees, this experiment table is equipped with the two column protected type hydraulic support that high-frequency data gathers, can to different mining heights, different-thickness, simulation when strength and stiffness characteristic top board is pressed, obtain the technical characterstics such as multiparameter.
Above experiment porch to a kind of mechanized coal mining bracket provided by the present invention and Relationship Between Face Supports And Surrounding describes in detail, used specific embodiment herein principle of the present invention and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications.In sum, this description should not be construed as limitation of the present invention.

Claims (5)

1. a mechanized coal mining bracket and Relationship Between Face Supports And Surrounding experiment porch, it is characterized in that, comprise loading experiment platform, two column protected type hydraulic support, hydraulic loading system, signal acquiring system and data handling system, wherein: described loading experiment platform comprises that two experiment table casings found groove, are connected to the carrying joist that is used for laying experiment material between the vertical groove of two experiment table casings, different layers position in experiment material is all buried strainometer underground, in order to monitor the STRESS VARIATION of superincumbent stratum in the seam mining process;
Described two column protected type hydraulic support is arranged on the carrying joist, and exploitation is used for the experiment material in simulation coal seam;
Described hydraulic loading system comprises the loading back timber, is arranged in the loading hydraulic cylinder that loads on the back timber and loads backing plate, described loading back timber is connected between the vertical groove of two experiment table casings and can moves up and down along the vertical groove of experiment table casing, and the loading surface of loading hydraulic cylinder acts on the experiment material by loading backing plate;
Described signal acquiring system comprises the strainometer that is arranged in the different layers position, be arranged in loading hydraulic cylinder and load LOAD CELLS between the backing plate, be used for gathering data acquisition system (DAS) and the data handling system of above-mentioned each sensor signal, and each sensor signal that data acquisition system (DAS) will gather sends data handling system to and processes.
2. a kind of mechanized coal mining bracket according to claim 1 and Relationship Between Face Supports And Surrounding experiment porch, it is characterized in that, described two column protected type hydraulic support comprises lifting jack, pressure transducer, base, back timber, four connecting rods, rear tail boom and the back timber balanced structure that can stretch, wherein base, four connecting rods, rear tail boom and back timber are hinged successively, the two ends of described back timber balanced structure are fixedly connected with back timber with rear tail boom respectively, described lifting jack one end is fixedly connected with base, and the other end and back timber are hinged.
3. a kind of mechanized coal mining bracket according to claim 2 and Relationship Between Face Supports And Surrounding experiment porch, it is characterized in that, between the acting surface of lifting jack and back timber pressure transducer is installed, sensor base is connected with the back timber bolt, and the sensor plush copper contacts with very heavy summit.
4. a kind of mechanized coal mining bracket according to claim 3 and Relationship Between Face Supports And Surrounding experiment porch, it is characterized in that, the vertical groove of described experiment table casing vertically equidistantly is distributed with horizontal through hole, and the two ends that load back timber are provided with horizontal through hole, and bolt passes horizontal through hole the two is fixed.
5. a kind of mechanized coal mining bracket according to claim 4 and Relationship Between Face Supports And Surrounding experiment porch is characterized in that, described hydraulic loaded cylinder is at least two.
CN 201110097533 2011-04-19 2011-04-19 Experimental platform for relation between mining fully-mechanized support and surrounding rocks CN102261972B (en)

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