CN109917100A - A kind of residual coal second mining Sub-Level Caving analog simulation experimental rig - Google Patents
A kind of residual coal second mining Sub-Level Caving analog simulation experimental rig Download PDFInfo
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- CN109917100A CN109917100A CN201711313595.6A CN201711313595A CN109917100A CN 109917100 A CN109917100 A CN 109917100A CN 201711313595 A CN201711313595 A CN 201711313595A CN 109917100 A CN109917100 A CN 109917100A
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- fixedly connected
- mobile base
- storage tank
- coal
- level caving
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Abstract
A kind of residual coal second mining Sub-Level Caving analog simulation experimental rig, including mobile base, hydraulic leg is fixedly connected at surrounding on the downside of the mobile base, it is fixedly connected on the downside of hydraulic leg top and mobile base, the free end of hydraulic leg is arranged downward, the bottom end of the hydraulic leg free end is fixedly connected with support baseboard, is also fixedly connected with four rolling on the downside of the mobile base；It is fixedly connected on the upside of the mobile base by four lifting devices and puts coal storage tank, the left side for putting coal storage tank is openning shape, and the bottom for putting coal storage tank is hinged with baffle by hinge.The beneficial effects of the invention are as follows realized using lifting device put coal storage tank angle facilitate adjusting, so that the speed to Sub-Level Caving is effectively controlled；The release that baffle is realized using baffle limiting device realizes going on smoothly for Sub-Level Caving；It is obtained using process data of the survey meter to Sub-Level Caving, improves intelligent level.
Description
Technical field
The present invention relates to Sub-Level Caving technical fields, and in particular to a kind of residual coal second mining Sub-Level Caving analog simulation experimental rig.
Background technique
Coal caving mining method is the bottom cloth in high seam mining, in a certain thickness range of the bottom plate in coal seam or coal seam
The coal working face that a mining height is 2~3m is set, carries out back production with comprehensive mechanization mode, utilizes the effect of mine pressure or auxiliary
With the methods of standing, make crushing voerhead coal at granular media after, released by " putting coal window " of bracket rear or top, and by scraper plate
Transporter transports working face.
Due to the limitation of residual coal occurrence condition, residual coal second mining, back production are carried out using entity coal low caving coal coal winning technology
Rate is too low, for the rate of extraction for improving working face, needs to carry out residual coal second mining Sub-Level Caving analog simulation test, to obtain optimal open
Adopt effect.
Summary of the invention
The purpose of the present invention is to provide a kind of residual coal second mining Sub-Level Caving analog simulation experimental rigs, to solve above-mentioned background
The problem of being proposed in technology.
To achieve the above object, the invention provides the following technical scheme:
A kind of residual coal second mining Sub-Level Caving analog simulation experimental rig, including mobile base, mobile base downside surrounding
Place is fixedly connected with hydraulic leg, is fixedly connected on the downside of hydraulic leg top and mobile base, the free end of hydraulic leg is downward
Setting, the bottom end of the hydraulic leg free end are fixedly connected with support baseboard, are also fixedly connected on the downside of the mobile base
Four rolling；It is fixedly connected on the upside of the mobile base by four lifting devices and puts coal storage tank, the left side for putting coal storage tank is
Openning shape, the bottom for putting coal storage tank are hinged with baffle by hinge, put and are fixedly connected with baffle limiting on the upside of coal storage tank
Device；It is placed with blanking box on the left of the mobile base, plate pusher, fixed company on plate pusher are placed on the left of blanking box
It is connected to survey meter.
Be made of as a further solution of the present invention: the coal storage tank of putting is transparent plastic material.
As the present invention, further scheme is: the lifting device includes support column, support column bottom end and mobile bottom
Seat upside is fixedly connected, and the groove of opening up setting is offered in support column, vertical threaded rod, vertical spiral shell are provided in groove
Rasp bar bottom end is fixedly connected with support column bottom, and the vertical threaded rod lower part is fixedly connected with driven wheel of differential, from mantle tooth
Wheel right side is engaged with drive bevel gear, and drive bevel gear right end is fixedly connected with rotating bar, and rotating bar right end is set across support column
It sets, the right end of the rotating bar is fixedly connected with first motor output shaft；It is provided in groove above the vertical threaded rod
Lifting column, lifting column lower part offer the thread groove of opening down setting, and the top of vertical threaded rod is threadedly coupled with thread groove,
And the top of the lifting column is fixedly connected with coal storage tank bottom is put.
As the present invention, further scheme is: anti-rotation groove there are two symmetrically opening up on the groove inner sidewall, anti-rotation
Anti-bull stick is provided in slot, the other end of the anti-bull stick is fixedly connected with lifting column side wall.
As the present invention, further scheme is: the baffle limiting device includes fixed block, and fixed block is in horizontal
Rectangular-shape offers the shifting chute of opening up setting on the fixed block, is provided with movable block in shifting chute, on movable block
Tapped through hole is offered, tapped through hole internal screw thread is connected with horizontal screw thread bar, and the both ends of horizontal screw thread bar are erected on fixed block,
The right end of the horizontal screw thread bar is fixedly connected with the second motor output shaft；The upside of the movable block connects by the way that link block is fixed
It is connected to horizon bar, is fixedly connected with postive stop baffle on the downside of the left end of horizon bar.
As the present invention, further scheme is: the section of the movable block and shifting chute is in convex shape, movable block
It is matched with shifting chute.
The beneficial effects of the invention are as follows realized using lifting device put coal storage tank angle facilitate adjusting, thus to caving
The speed of coal is effectively controlled；The release that baffle is realized using baffle limiting device, realize Sub-Level Caving it is smooth into
Row；It is obtained using process data of the survey meter to Sub-Level Caving, improves intelligent level.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention；
Fig. 2 is the structural schematic diagram of lifting device of the present invention；
Fig. 3 is the structural schematic diagram of baffle limiting device of the present invention；
Fig. 4 is the sectional view along A-A in Fig. 3 of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Please refer to Fig. 1-Fig. 4, in the embodiment of the present invention, a kind of residual coal second mining Sub-Level Caving analog simulation experimental rig, including
Mobile base 1 is fixedly connected with hydraulic leg 2,2 top of hydraulic leg and mobile base 1 at the 1 downside surrounding of mobile base
Downside is fixedly connected, and the free end of hydraulic leg 2 is arranged downward, and the bottom end of 2 free end of hydraulic leg is fixedly connected with branch
Bottom plate 3 is supportted, 1 downside of mobile base is also fixedly connected with four rolling 4, and when the invention works, hydraulic leg 2 drives branch
Support bottom plate 3 is moved downward to be touched with ground, then the steady operation of the present apparatus may be implemented；After work, utilization is hydraulic
Supporting leg 2 can be such that support baseboard 3 rises, and allow idler wheel 4 that mobile base 1 to be driven to be moved easily；
It is fixedly connected on the upside of the mobile base 1 by four lifting devices 5 and puts coal storage tank 6, put the left side of coal storage tank 6
For openning shape, the lifting device 5 includes support column 501, is fixedly connected, supports on the upside of 501 bottom end of support column and mobile base 1
The groove 502 of opening up setting is offered in column 501, and vertical threaded rod 503, vertical threaded rod 503 are provided in groove 502
Bottom end is fixedly connected with 501 bottom of support column, and vertical 503 lower part of threaded rod is fixedly connected with driven wheel of differential 504, driven
Drive bevel gear 505 is engaged on the right side of bevel gear 504,505 right end of drive bevel gear is fixedly connected with rotating bar 506, rotating bar
506 right ends are arranged across support column 501, and the right end of the rotating bar 506 is fixedly connected with 507 output shaft of first motor；It is described
It is provided with lifting column 5011 in the groove 502 of vertical 503 top of threaded rod, 5011 lower part of lifting column offers opening down set
The top of the thread groove 508 set, vertical threaded rod 503 is threadedly coupled with thread groove 508, and the top of the lifting column 5011 with
It puts 6 bottom of coal storage tank to be fixedly connected, can be convenient using two lifting devices 5 and realize the tilt angle for putting coal storage tank 6, to change
The speed for putting coal is become, specific practice is to change the lifting column protrusion height of two sides: starting first motor, first motor drive
Rotating bar, rotating bar drive drive bevel gear rotation, and the rotation of active conical tooth wheel drive driven wheel of differential, driven wheel of differential drives perpendicular
The rotation of straight thread bar, the lifting column 5011 matched with vertical threaded rod stretches out or declines out of groove 502, to realize
Put the adjusting of 6 angle of coal storage tank.
It is symmetrically opened up on 502 inner sidewall of groove there are two anti-rotation groove 509, is provided with anti-bull stick in anti-rotation groove 509
5010, the other end of the anti-bull stick 5010 is fixedly connected with 5011 side wall of lifting column, under the action of anti-bull stick 5010, lifting
Column 5011 can not be rotated together with vertical threaded rod 503, then lifting column 5011 can only be moved up and down along anti-rotation groove 509.
The bottom for putting coal storage tank 6 is hinged with baffle 8 by hinge 9, and the upside for putting coal storage tank 6 is fixedly connected with baffle
Limiting device 7, the baffle limiting device 7 include fixed block 701, and fixed block 701 is in horizontal rectangular-shape, the fixed block
The shifting chute 702 of opening up setting is offered on 701, and movable block 703 is provided in shifting chute 702, is opened up on movable block 703
There is tapped through hole 704,704 internal screw thread of tapped through hole is connected with horizontal screw thread bar 705, and the both ends of horizontal screw thread bar 705 are erected at
On fixed block 701, the right end of the horizontal screw thread bar 705 is fixedly connected with 706 output shaft of the second motor；The movable block 703
Upside horizon bar 708 is fixedly connected with by link block 707, be fixedly connected with postive stop baffle on the downside of the left end of horizon bar 708
709, before Sub-Level Caving, baffle 8 is in a vertical state, and postive stop baffle 709 keeps baffle 8 fixed, will not rotate around hinge 9, when
When needing to carry out Sub-Level Caving, start the second motor 706, the second motor 706 drives horizontal screw thread bar 705 to rotate, with horizontal screw thread
The movable block 703 that bar 705 matches moves to the left, so that horizon bar 708 is driven to move to the left by link block 703,
It moves postive stop baffle 709 to the left, loses the position-limiting action to baffle 8, then thrust around hinge of the baffle 8 by material
9 rotate counterclockwise, and realize Sub-Level Caving movement.
The section of the movable block 703 and shifting chute 702 is in convex shape, and movable block 703 is matched with shifting chute 702,
The movable block 703 of convex shape will not be rotated together with horizontal screw thread bar 705, and movable block 703 will not be out of shifting chute 702
It removes.
Blanking box 10 is placed on the left of the mobile base 1, the left side of blanking box 10 is placed with plate pusher 11, and plate pushes away
It is fixedly connected with survey meter 12 on vehicle 11, during Sub-Level Caving, data are obtained with survey meter 12, it is thus achieved that intelligent
Sub-Level Caving put analysis.
The coal storage tank 6 of putting is made of transparent plastic material, convenient for observing the motion conditions for putting 6 materials inside of coal storage tank.
The course of work of the invention is: when the invention works, hydraulic leg 2 drives support baseboard 3 to move downward and ground
Face is in contact, then the steady operation of the present apparatus may be implemented；After work, support baseboard 3 can be made using hydraulic leg 2
It rises, allows idler wheel 4 that mobile base 1 to be driven to be moved easily；It can be convenient realization using two lifting devices 5 and put coal storage tank 6
Tilt angle, to change the speed for putting coal, specific practice is to change the lifting column protrusion height of two sides: starting first
Motor, first motor drive rotating bar, and rotating bar drives drive bevel gear rotation, and active conical tooth wheel drive driven wheel of differential turns
Dynamic, driven wheel of differential drives vertical threaded rod rotation, and the lifting column 5011 matched with vertical threaded rod is stretched out of groove 502
Out or decline, to realize the adjusting for putting 6 angle of coal storage tank；
Before Sub-Level Caving, baffle 8 is in a vertical state, and postive stop baffle 709 keeps baffle 8 fixed, will not be 9 turns around hinge
It is dynamic, when needing to carry out Sub-Level Caving, start the second motor 706, the second motor 706 drives horizontal screw thread bar 705 to rotate, with level
The movable block 703 that threaded rod 705 matches moves to the left, to drive horizon bar 708 by link block 703 to the left
It is mobile, it moves postive stop baffle 709 to the left, loses the position-limiting action to baffle 8, then thrust of the baffle 8 by material
Around hinge 9 rotates counterclockwise, and realizes Sub-Level Caving movement；During Sub-Level Caving, data are obtained with survey meter 12, it is thus real
Show intelligentized Sub-Level Caving and puts analysis.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie
In the case where without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power
Benefit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent elements of the claims
Variation is included within the present invention.Any reference signs in the claims should not be construed as limiting the involved claims.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
The other embodiments being understood that.
Claims (6)
1. a kind of residual coal second mining Sub-Level Caving analog simulation experimental rig, including mobile base, which is characterized in that the mobile base
Be fixedly connected with hydraulic leg at the surrounding of downside, be fixedly connected on the downside of hydraulic leg top and mobile base, hydraulic leg from
It is arranged downward by holding, the bottom end of the hydraulic leg free end is fixedly connected with support baseboard, and the mobile base downside is also solid
Surely it is connected with four rolling；It is fixedly connected on the upside of the mobile base by four lifting devices and puts coal storage tank, put coal storage tank
Left side be openning shape, the bottom for putting coal storage tank is hinged with baffle by hinge, puts and be fixedly connected on the upside of coal storage tank
Baffle limiting device；It is placed with blanking box on the left of the mobile base, plate pusher, plate pusher are placed on the left of blanking box
On be fixedly connected with survey meter.
2. a kind of residual coal second mining Sub-Level Caving analog simulation experimental rig according to claim 1, which is characterized in that described to put
Coal storage tank is made of transparent plastic material.
3. a kind of residual coal second mining Sub-Level Caving analog simulation experimental rig according to claim 1, which is characterized in that the liter
Falling unit includes support column, is fixedly connected on the upside of support column bottom end and mobile base, opening up setting is offered in support column
Groove, vertical threaded rod is provided in groove, vertical threaded rod bottom end is fixedly connected with support column bottom, the vertical screw thread
Bar lower part is fixedly connected with driven wheel of differential, is engaged with drive bevel gear on the right side of driven wheel of differential, drive bevel gear right end is fixed
It is connected with rotating bar, rotating bar right end is arranged across support column, and the right end of the rotating bar is fixedly connected with first motor output
Axis；Lifting column is provided in groove above the vertical threaded rod, lifting column lower part offers the screw thread of opening down setting
The top of slot, vertical threaded rod is threadedly coupled with thread groove, and the top of the lifting column is fixedly connected with coal storage tank bottom is put.
4. a kind of residual coal second mining Sub-Level Caving analog simulation experimental rig according to claim 3, which is characterized in that described recessed
It is symmetrically opened up on slot inner sidewall there are two anti-rotation groove, is provided with anti-bull stick, the other end of the anti-bull stick and lifting in anti-rotation groove
Column side wall is fixedly connected.
5. a kind of residual coal second mining Sub-Level Caving analog simulation experimental rig according to claim 1, which is characterized in that the gear
Plate limiting device includes fixed block, and fixed block is in horizontal rectangular-shape, offers opening up setting on the fixed block
Shifting chute is provided with movable block in shifting chute, tapped through hole is offered on movable block, tapped through hole internal screw thread is connected with horizontal spiral shell
The both ends of rasp bar, horizontal screw thread bar are erected on fixed block, and right end and the second motor output shaft of the horizontal screw thread bar are fixed
Connection；The upside of the movable block is fixedly connected with horizon bar by link block, is fixedly connected on the downside of the left end of horizon bar limited
Position baffle.
6. a kind of residual coal second mining Sub-Level Caving analog simulation experimental rig according to claim 5, which is characterized in that the shifting
The section of motion block and shifting chute is in convex shape, and movable block is matched with shifting chute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711313595.6A CN109917100A (en) | 2017-12-12 | 2017-12-12 | A kind of residual coal second mining Sub-Level Caving analog simulation experimental rig |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711313595.6A CN109917100A (en) | 2017-12-12 | 2017-12-12 | A kind of residual coal second mining Sub-Level Caving analog simulation experimental rig |
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| CN109917100A true CN109917100A (en) | 2019-06-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711313595.6A Pending CN109917100A (en) | 2017-12-12 | 2017-12-12 | A kind of residual coal second mining Sub-Level Caving analog simulation experimental rig |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110281089A (en) * | 2019-07-08 | 2019-09-27 | 中铁隧道局集团有限公司 | It is a kind of for cutting the ultrasonic unit of boulder in front of tunnel |
| CN113866385A (en) * | 2021-09-17 | 2021-12-31 | 太原理工大学 | Residual coal re-mining three-dimensional similarity simulation experiment device and method |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1786420A (en) * | 2004-12-10 | 2006-06-14 | 兖州煤业股份有限公司 | Electric hydraulic controlled caving coal method and it hydraulic supporter |
| CN102749432A (en) * | 2012-05-17 | 2012-10-24 | 中国矿业大学(北京) | Fully mechanized caving top coal caving three-dimensional simulation experiment platform and experiment method |
| CN102756891A (en) * | 2012-04-26 | 2012-10-31 | 北京航空航天大学 | Pneumatic pull rod type medicine discharge device and method |
| CN103399135A (en) * | 2013-07-23 | 2013-11-20 | 中国矿业大学 | Experiment table and experiment method for identifying coal-gangue dynamic state |
| CN203809982U (en) * | 2014-05-07 | 2014-09-03 | 谷志伟 | Mine electromechanical equipment operating platform |
| CN104085543A (en) * | 2014-06-27 | 2014-10-08 | 长兴明晟冶金炉料有限公司 | Castable packaging device |
| CN205103248U (en) * | 2015-11-10 | 2016-03-23 | 西安科技大学 | Similar material simulation experiment apparatus |
| CN205432704U (en) * | 2016-03-02 | 2016-08-10 | 郑州澍青医学高等专科学校 | Computer console |
| CN107411119A (en) * | 2017-08-15 | 2017-12-01 | 安徽华瑞医药技术开发有限公司 | A kind of sugarcane quick treatment device with rotation peeling function |
-
2017
- 2017-12-12 CN CN201711313595.6A patent/CN109917100A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1786420A (en) * | 2004-12-10 | 2006-06-14 | 兖州煤业股份有限公司 | Electric hydraulic controlled caving coal method and it hydraulic supporter |
| CN102756891A (en) * | 2012-04-26 | 2012-10-31 | 北京航空航天大学 | Pneumatic pull rod type medicine discharge device and method |
| CN102749432A (en) * | 2012-05-17 | 2012-10-24 | 中国矿业大学(北京) | Fully mechanized caving top coal caving three-dimensional simulation experiment platform and experiment method |
| CN103399135A (en) * | 2013-07-23 | 2013-11-20 | 中国矿业大学 | Experiment table and experiment method for identifying coal-gangue dynamic state |
| CN203809982U (en) * | 2014-05-07 | 2014-09-03 | 谷志伟 | Mine electromechanical equipment operating platform |
| CN104085543A (en) * | 2014-06-27 | 2014-10-08 | 长兴明晟冶金炉料有限公司 | Castable packaging device |
| CN205103248U (en) * | 2015-11-10 | 2016-03-23 | 西安科技大学 | Similar material simulation experiment apparatus |
| CN205432704U (en) * | 2016-03-02 | 2016-08-10 | 郑州澍青医学高等专科学校 | Computer console |
| CN107411119A (en) * | 2017-08-15 | 2017-12-01 | 安徽华瑞医药技术开发有限公司 | A kind of sugarcane quick treatment device with rotation peeling function |
Non-Patent Citations (2)
| Title |
|---|
| 周春志: "急倾斜和大角度俯采放顶煤工作面设备选型及优化设计", 《煤矿机械》 * |
| 唐治 等: "煤柱对下层煤层开采影响的数值分析", 《中国地质灾害与防治学报》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110281089A (en) * | 2019-07-08 | 2019-09-27 | 中铁隧道局集团有限公司 | It is a kind of for cutting the ultrasonic unit of boulder in front of tunnel |
| CN110281089B (en) * | 2019-07-08 | 2020-07-28 | 中铁隧道局集团有限公司 | Ultrasonic device for cutting tunnel front boulder |
| CN113866385A (en) * | 2021-09-17 | 2021-12-31 | 太原理工大学 | Residual coal re-mining three-dimensional similarity simulation experiment device and method |
| CN113866385B (en) * | 2021-09-17 | 2024-04-02 | 太原理工大学 | Residual coal repeated mining three-dimensional similarity simulation experiment device and method |
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Application publication date: 20190621 |