CN109883593B - Coal mine rock burst monitoring and early warning device - Google Patents
Coal mine rock burst monitoring and early warning device Download PDFInfo
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- CN109883593B CN109883593B CN201910199363.5A CN201910199363A CN109883593B CN 109883593 B CN109883593 B CN 109883593B CN 201910199363 A CN201910199363 A CN 201910199363A CN 109883593 B CN109883593 B CN 109883593B
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Abstract
The invention provides a coal mine rock burst monitoring and early warning device, which comprises a stress meter arranged on a drill hole and a connecting wire connected to the outer side of the stress meter, and is characterized in that: the device also comprises a shell valve body and a push-pull rod; the outer wall of the stress meter is connected to the inner wall of the shell valve body through an elastic telescopic mechanism; the stress gauge is in contact with the push-pull rod; the outer wall of the push-pull rod is connected to the inner wall of the outer shell valve body through a rod piece, and the outer diameter of the push-pull rod is smaller than that of the stress meter. The stress meter solves the problems that in the prior art, the stress meter which can be used repeatedly cannot be attached to the wall of a drilled hole fully, so that the monitoring accuracy is low and continuous monitoring cannot be realized.
Description
Technical Field
The invention relates to the technical field of coal mine rock burst monitoring, in particular to a coal mine rock burst monitoring and early warning device.
Background
Rock burst is a dynamic phenomenon characterized by sudden, sharp and violent destruction of coal and rock mass around a stope due to the instantaneous release of elastic deformation energy when the coal and rock mass is destroyed in a mechanical equilibrium state. Rock burst is a particular mine pressure manifestation. The apparent strength characteristics of the composite material are generally weak impact, strong impact, ejection, mine earthquake, rock burst, coal cannon, shock wave, elastic vibration and the like, and the composite material is often accompanied with the phenomena of coal and rock mass throwing, loud sound, air wave and the like; the impact wave is sudden and violent, and the impact wave has huge force, so that the roadway, the coal mining working face and the equipment are destroyed instantly, and the personnel are injured. Therefore, it is very important to monitor and warn the impact ground pressure, and the method mainly includes: empirical analogy, drill cuttings and mine pressure monitoring, with mine monitoring being most commonly used.
However, the coal ground pressure monitoring device in the prior art has many defects in the practical use process, such as:
at present, the mine pressure monitoring device who generally adopts often uses the rig earlier in tunnel roof or two construction drilling, then installs the stressmeter to drilling in, and the outer end of the connecting wire that the stressmeter is connected is installed to the outside corresponding instrument of drilling on, monitors mine pressure, reaches the effect of carrying out the early warning forecast to the impact pressure, but the stressmeter uses the member conflict to install to drilling after, can't take out, has caused the waste.
The prior art discloses a rock burst early warning device (CN207701179U) for coal mine prevention and cure, it uses the telescopic link to insert the borehole stressometer into the borehole bottom and is used for detecting the change of mine pressure, and show the change situation of mine pressure through the stress display table, because the external diameter size of the stressometer is less than the aperture of the borehole, can extract the used repeatedly after monitoring, not only save the cost, reach the effect of monitoring and early warning rock burst simultaneously, but its stressometer that relates to can not fully laminate with the borehole wall and be difficult to reflect the change of mine pressure accurately and in time, and the device can not reach the effect that fixed mounting carries out continuous monitoring to mine pressure in the roof drilling.
Disclosure of Invention
According to the stress meter which can be repeatedly used and provided, the stress meter cannot be fully attached to the hole wall of the drill hole, the technical problems that the monitoring accuracy is low and continuous monitoring cannot be achieved are solved, and the coal mine rock burst monitoring and early warning device is provided. The periphery of the stress meter is connected with the shell clack body through the elastic telescopic structure, the shell clack body can be in close contact with the inner wall of the drill hole, and the stress meter can be smoothly pulled out from the drill hole to realize recycling.
The technical means adopted by the invention are as follows:
a coal mine rock burst monitoring and early warning device comprises a stress meter arranged in a drill hole, a connecting wire connected to the outer side of the stress meter, a shell petal body and a push-pull rod; the outer wall of the stress meter is connected to the inner wall of the shell valve body through an elastic telescopic mechanism; the stress gauge is in contact with the push-pull rod; the outer wall of the push-pull rod is connected to the inner wall of the outer shell valve body through a rod piece, and the outer diameter of the push-pull rod is smaller than that of the stress meter.
Furthermore, the elastic telescopic mechanism comprises a sleeve, a convex column and a spring; the sleeve and the convex column are respectively fixed on the inner wall of the shell valve body and the outer wall of the stress meter, and the sleeve is sleeved with the convex column; the spring both ends connect respectively in the inner wall of shell lamella body with the outer wall of stressmeter, the spring housing is located the sleeve with the outside of projection.
Furthermore, the shell petal body is arranged above and below the stress meter respectively; at least two rows of elastic telescopic mechanisms are uniformly arranged between the shell valve body and the stress meter, and the number of the elastic telescopic mechanisms in each row is at least five.
Furthermore, the rod piece comprises a first connecting rod and a second connecting rod, one end of the first connecting rod and one end of the second connecting rod are respectively connected to the outer wall of the push-pull rod through an ear seat in a rotating mode, and the other end of the first connecting rod and the other end of the second connecting rod are respectively connected to the inner wall of the outer shell petal body through an ear seat in a rotating mode.
Further, the distance between the positions where the first connecting rod and the second connecting rod are connected with the outer shell petal body is equal to the distance between the positions where the first connecting rod and the second connecting rod are connected with the push-pull rod.
Further, the outer diameter of the outer housing petals is equal to the bore diameter of the bore.
Furthermore, the positions of the first connecting rod and the second connecting rod connected with the outer shell petal body are both located on the midline of the outer shell petal body.
Furthermore, the bottom of the push-pull rod is provided with threads.
Compared with the prior art, the invention has the following advantages:
according to the coal mine rock burst monitoring and early warning device, the periphery of the stress gauge is connected with the outer shell clack body through the elastic telescopic structure, after the stress gauge is supported to the inside of the drill hole through the push-pull rod, the outer shell clack body can be in close contact with the inner wall of the drill hole, so that the outer shell clack body can timely transmit the change of mine pressure to the stress gauge through the elastic telescopic mechanism, and the stress gauge can be fixedly arranged in the vertical top plate drill hole and used for continuously and accurately monitoring the mine pressure; after the monitoring work is finished, the outer shell valve body can be contracted towards the center direction of the outer shell valve body through the outer pull-push rod so as to meet the requirement of being smoothly pulled out from the drill hole, the recycling of the stress meter is achieved, and the cost is greatly saved.
In conclusion, the periphery of the stress meter is connected with the outer shell petal body through the elastic telescopic structure, the outer shell petal body can be in close contact with the inner wall of the drill hole, and the stress meter can be smoothly pulled out from the drill hole to realize recycling. Therefore, the technical scheme of the invention solves the problems that the stress meter which can be repeatedly used in the prior art cannot be fully attached to the hole wall of the drilled hole, so that the monitoring accuracy is low and continuous monitoring cannot be realized.
Based on the reason, the invention can be widely popularized in the fields of coal mine ground pressure monitoring and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a coal mine rock burst monitoring and early warning device.
Fig. 2 is a schematic structural diagram of the coal mine rock burst monitoring and early warning device.
Fig. 3 is a schematic cross-sectional view of the coal mine rock burst monitoring and early warning device.
Fig. 4 is an enlarged schematic view of a portion a in fig. 3.
In the figure: 1. a stress meter; 2. a housing flap; 21. a sleeve; 22. a convex column; 23. a spring; 3. a push-pull rod; 31. a first connecting rod; 32. a second connecting rod; 4. and connecting the wires.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. Any specific values in all examples shown and discussed herein are to be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the absence of any contrary indication, these directional terms are not intended to indicate and imply that the device or element so referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be considered as limiting the scope of the present invention: the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.
Example 1
As shown in fig. 1-4, the invention provides a coal mine rock burst monitoring and early warning device, which comprises a stress meter 1 installed in a drill hole and a connecting wire 4 connected to the outer side of the stress meter 1, wherein the outer end of the connecting wire 4 is connected with an instrument for displaying a stress value; the monitoring and early warning device further comprises a shell valve body 2 and a push-pull rod 3; the outer wall of the stress meter 1 is connected to the inner wall of the shell valve body 2 through an elastic telescopic mechanism; the stress gauge 1 is in contact with the push-pull rod 3; the push-pull rod 3 is sleeved outside the connecting line 4, the outer wall of the push-pull rod 3 is connected to the inner wall of the outer shell valve body 2 through a rod piece, and the outer diameter of the push-pull rod 3 is smaller than that of the stress meter 1; use push-and-pull rod 3 to support stressometer 1 to the inside back of drilling, shell lamella body 2 can form in close contact with the drilling inner wall, make shell lamella body 2 can in time transmit the change of mine pressure to stressometer 1 through elastic telescopic mechanism, stressometer 1 transmits pressure variation to display instrument through connecting wire 4, make stressometer 1 can be used for the continuous accurate monitoring to mine pressure in vertical roof drilling by fixed mounting, after the monitoring work, through outer pull-and-push rod 3, push-and-pull rod 3 realizes through the member that shell lamella body 2 is to its central direction shrink in order to satisfy smoothly to extract from drilling, reach the effect of stressometer recycle.
Further, the elastic telescopic mechanism comprises a sleeve 21, a convex column 22 and a spring 23; the sleeve 21 and the convex column 22 are respectively fixed on the inner wall of the shell valve body 2 and the outer wall of the strain gauge 1, and the sleeve 21 is sleeved with the convex column 22; two ends of the spring 23 are respectively connected to the inner wall of the shell body 2 and the outer wall of the strain gauge 1, and the spring 23 is sleeved outside the sleeve 21 and the convex column 22; after installing stressometer 1, mine pressure is on the outer wall of the shell lamella body 2, and it transmits to stress 1 through spring 23, reaches the effect of monitoring mine pressure, and after the monitoring work, when pulling push-and-pull 3 outward, the shrink is realized to shell lamella body 2 compression spring 23, because the cup joint of sleeve 21 and projection 22 for spring 23 can avoid shearing failure.
Furthermore, the shell petal body 2 is respectively arranged above and below the stress gauge 1; at least two rows of elastic telescopic mechanisms are uniformly arranged between the shell body 2 and the stressometer 1, and the number of each row of elastic telescopic mechanisms is at least five; the stress meter is used for ensuring that mine pressure can be uniformly transmitted to the stress meter 1, and is convenient for accurately detecting the pressure.
Further, the rod member comprises a first connecting rod 31 and a second connecting rod 32, one end of the first connecting rod 31 and one end of the second connecting rod 32 are respectively rotatably connected to the outer wall of the push-pull rod 3 through an ear seat, and the other end of the first connecting rod 31 and the other end of the second connecting rod 32 are respectively rotatably connected to the inner wall of the outer shell petal body 2 through an ear seat; when the push-pull rod 3 is pulled outwards, the first connecting rod 31 and the second connecting rod 32 synchronously apply pulling force to the outer shell petal body 2, and component force in the direction of the spring 23 is provided, so that the outer shell petal body 2 can be uniformly contracted integrally.
Further, the distance between the positions where the first connecting rod 31 and the second connecting rod 32 are connected to the outer housing body 2 is equal to the distance between the positions where the push-pull rod 3 is connected; for further ensuring uniform and synchronous shrinkage of the whole of the outer casing petal body 2, so as to be smoothly pulled out from the drill hole after the monitoring is completed.
Further, the outer diameter of the outer casing petal body 2 is equal to the bore diameter of the drill hole; after the stress meter 1 is installed, the friction force between the shell petal body 2 and the hole wall of the drilled hole meets the effect that the stress meter 1 is fixed and does not flee outwards, and meanwhile, the change of the mine pressure can be timely, accurately and sensitively detected.
Further, the positions where the first connecting rod 31 and the second connecting rod 32 are connected with the outer casing petal body 2 are both located on the midline of the outer casing petal body 2; further ensuring uniform contraction of the outer housing petals 2.
Further, the bottom of the push-pull rod 3 is provided with threads; during installation, the requirement that the stress gauge 1 is installed in a deep drill hole can be met by connecting other rod pieces at the bottom of the push-pull rod through threads.
The working principle is as follows: when the coal mine rock burst monitoring and early warning device is used, after the stress gauge 1 is abutted to the inside of a drill hole, mine pressure acts on the outer wall of the outer shell petal body 2 and is transmitted to the stress gauge 1 through the spring 23, the stress gauge 1 transmits pressure change to the display instrument through the connecting wire 4, when the push-pull rod 3 is pulled outwards after monitoring work is finished, the first connecting rod 31 and the second connecting rod 32 synchronously apply tension to the outer shell petal body 2 to provide component force along the direction of the spring 23, so that the outer shell petal body 2 compresses the spring 23 to realize integral uniform contraction, and the effect of smoothly pulling out the spring from the drill hole is achieved.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. The utility model provides a colliery rock burst monitors early warning device, including install in the stressmeter of drilling and connect in the connecting wire in the stressmeter outside, its characterized in that: the device also comprises a shell valve body and a push-pull rod;
the outer wall of the stress meter is connected to the inner wall of the shell valve body through an elastic telescopic mechanism; the stress gauge is in contact with the push-pull rod;
the outer wall of the push-pull rod is connected to the inner wall of the outer shell valve body through a rod piece, and the outer diameter of the push-pull rod is smaller than that of the stress meter;
the elastic telescopic mechanism comprises a sleeve, a convex column and a spring;
the sleeve and the convex column are respectively fixed on the inner wall of the shell valve body and the outer wall of the stress meter, and the sleeve is sleeved with the convex column;
the spring both ends connect respectively in the inner wall of shell lamella body with the outer wall of stressmeter, the spring housing is located the sleeve with the outside of projection.
2. The coal mine rock burst monitoring and early warning device according to claim 1, wherein one outer shell petal body is arranged above and below the stress gauge; at least two rows of elastic telescopic mechanisms are uniformly arranged between the shell valve body and the stress meter, and the number of the elastic telescopic mechanisms in each row is at least five.
3. The coal mine rock burst monitoring and early warning device as claimed in claim 2, wherein the rod member comprises a first connecting rod and a second connecting rod, one end of the first connecting rod and one end of the second connecting rod are respectively and rotatably connected to the outer wall of the push-pull rod through an ear seat, and the other end of the first connecting rod and the other end of the second connecting rod are respectively and rotatably connected to the inner wall of the outer shell petal body through an ear seat.
4. The coal mine rock burst monitoring and early warning device of claim 3, wherein the distance between the positions where the first connecting rod and the second connecting rod are connected with the outer shell petal body is equal to the distance between the positions where the push-pull rod is connected.
5. The coal mine rock burst monitoring and early warning device of claim 1, wherein the outer diameter of the outer casing petal body is equal to the bore diameter of the drill hole.
6. The coal mine rock burst monitoring and early warning device as claimed in claim 4, wherein the positions where the first connecting rod and the second connecting rod are connected with the outer casing petal body are both located on the midline of the outer casing petal body.
7. The coal mine rock burst monitoring and early warning device as claimed in claim 1, wherein threads are arranged at the bottom of the push-pull rod.
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| CN201910199363.5A CN109883593B (en) | 2019-03-15 | 2019-03-15 | Coal mine rock burst monitoring and early warning device |
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| CN201910199363.5A CN109883593B (en) | 2019-03-15 | 2019-03-15 | Coal mine rock burst monitoring and early warning device |
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| CN109883593A CN109883593A (en) | 2019-06-14 |
| CN109883593B true CN109883593B (en) | 2021-04-06 |
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| CN110307927B (en) * | 2019-07-22 | 2024-04-09 | 安徽马钢张庄矿业有限责任公司 | Pressure detection mechanism for mining engineering |
| CN111912551A (en) * | 2020-07-16 | 2020-11-10 | 嘉兴学院 | High-stability monocrystalline silicon pressure sensor |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102392685A (en) * | 2011-09-12 | 2012-03-28 | 山东科技大学 | Dense roadway group rock burst hazard prediction method |
| CN103969133A (en) * | 2014-04-24 | 2014-08-06 | 陈凤平 | Comprehensive detection method for coal bed stress |
| CN204186375U (en) * | 2014-09-02 | 2015-03-04 | 中国地质科学院探矿工艺研究所 | Geological exploration rope coring drilling coal seam air pressure tester |
| CN106761868A (en) * | 2016-12-30 | 2017-05-31 | 安徽理工大学 | A kind of novel durable magnetizes anchor pole |
| CN107328385A (en) * | 2017-08-15 | 2017-11-07 | 山东科技大学 | Goaf roof and floor deformation and obturation stress monitoring integrated apparatus and method |
| CN207366116U (en) * | 2017-10-15 | 2018-05-15 | 安徽理工大学 | A kind of recyclable geostress survey device |
| CN207701179U (en) * | 2017-12-25 | 2018-08-07 | 何勇 | A kind of coal mine prevention bump prior-warning device |
-
2019
- 2019-03-15 CN CN201910199363.5A patent/CN109883593B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102392685A (en) * | 2011-09-12 | 2012-03-28 | 山东科技大学 | Dense roadway group rock burst hazard prediction method |
| CN103969133A (en) * | 2014-04-24 | 2014-08-06 | 陈凤平 | Comprehensive detection method for coal bed stress |
| CN204186375U (en) * | 2014-09-02 | 2015-03-04 | 中国地质科学院探矿工艺研究所 | Geological exploration rope coring drilling coal seam air pressure tester |
| CN106761868A (en) * | 2016-12-30 | 2017-05-31 | 安徽理工大学 | A kind of novel durable magnetizes anchor pole |
| CN107328385A (en) * | 2017-08-15 | 2017-11-07 | 山东科技大学 | Goaf roof and floor deformation and obturation stress monitoring integrated apparatus and method |
| CN207366116U (en) * | 2017-10-15 | 2018-05-15 | 安徽理工大学 | A kind of recyclable geostress survey device |
| CN207701179U (en) * | 2017-12-25 | 2018-08-07 | 何勇 | A kind of coal mine prevention bump prior-warning device |
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