CN115493558A - Settlement monitoring device - Google Patents
Settlement monitoring device Download PDFInfo
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- CN115493558A CN115493558A CN202211302958.7A CN202211302958A CN115493558A CN 115493558 A CN115493558 A CN 115493558A CN 202211302958 A CN202211302958 A CN 202211302958A CN 115493558 A CN115493558 A CN 115493558A
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- 238000012806 monitoring device Methods 0.000 title claims abstract description 41
- 238000012544 monitoring process Methods 0.000 claims abstract description 26
- 238000013480 data collection Methods 0.000 claims abstract description 9
- 238000004062 sedimentation Methods 0.000 claims description 24
- 241000242541 Trematoda Species 0.000 claims description 10
- 239000003245 coal Substances 0.000 abstract description 3
- 238000005065 mining Methods 0.000 abstract description 2
- 239000002689 soil Substances 0.000 description 9
- 239000011435 rock Substances 0.000 description 6
- 230000008054 signal transmission Effects 0.000 description 6
- 230000002093 peripheral effect Effects 0.000 description 5
- 238000005259 measurement Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 241000935974 Paralichthys dentatus Species 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C5/00—Measuring height; Measuring distances transverse to line of sight; Levelling between separated points; Surveyors' levels
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Testing Or Calibration Of Command Recording Devices (AREA)
Abstract
The invention relates to the field of coal mining safety monitoring, in particular to a settlement monitoring device which comprises a settlement acquisition component, a data collection component and a connecting wire, wherein one end of the settlement acquisition component is suitable for being inserted into the ground surface to acquire settlement amount, the data collection component comprises a wire take-up component and a data acquisition component, one end of the wire take-up component is connected with the settlement acquisition component, the other end of the wire take-up component is connected with the data acquisition component, one end of the connecting wire is connected with the wire take-up component, and the other end of the connecting wire is connected with the settlement acquisition component. The settlement monitoring device can improve the monitoring precision, and further improve the stability and the safety of the settlement monitoring device.
Description
Technical Field
The invention relates to the field of coal mining safety monitoring, in particular to a settlement monitoring device.
Background
After the underground coal seam is mined, the original stress balance state of rock bodies in the peripheral area is damaged, in the process that the stress reaches new balance, rock strata and the ground surface move and deform, rock stratum settlement and ground surface collapse can damage production and living facilities in the rock strata and the ground surface, normal use of the facilities is influenced, and great safety risks exist, so that the rock strata and the ground surface settlement need to be monitored. A drilling type rock stratum settlement monitoring system is provided in the related art, the settlement of an anchoring point in a drill hole is monitored by measuring the rotation angle of a pulley through a displacement angle sensor, but the pulley and a steel strand measuring line slide relatively in the using process, so that the measuring accuracy is reduced.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, the embodiment of the invention provides a settlement monitoring device, which can improve the monitoring precision and further improve the stability and the safety of the settlement monitoring device.
The settlement monitoring device of the embodiment of the invention comprises: a settlement collecting member having one end adapted to be inserted into the ground surface to collect a settlement amount; the data collection assembly comprises a wire collection component and a data collection component, one end of the wire collection component is connected with the sedimentation collection component, and the other end of the wire collection component is connected with the data collection component; and one end of the connecting wire is connected with the wire collecting component, and the other end of the connecting wire is connected with the sedimentation collecting component.
The settlement monitoring device provided by the embodiment of the invention can improve the monitoring precision, thereby improving the stability and safety of the settlement monitoring device.
In some embodiments, the line part of receiving includes primary shaft, fixing base and collection piece, the data acquisition part includes first angle measurement spare, the fixing base has and holds the chamber, the primary shaft with the collection piece is arranged hold the intracavity, the collection piece cover is established on the primary shaft, the primary shaft is equipped with the external screw thread, the collection piece be equipped with the internal thread that the external screw thread links to each other, just the collection piece is relative the primary shaft is rotatable, connect the other end of rope with the collection piece links to each other, first angle measurement part cover is established in order to monitor on the primary shaft collection piece pivoted angle.
In some embodiments, the collecting member includes a collecting portion and a coil spring portion, the collecting portion is provided with the internal thread, the collecting portion is sleeved on the first shaft, one end of the coil spring portion is connected to the fixing base, and the other end of the coil spring portion is connected to the collecting portion so that the collecting portion and the connecting wire are kept tensioned.
In some embodiments, the collecting portion is provided with a wire groove, the wire groove is spirally arranged on the outer wall surface of the collecting portion in the axial direction of the first shaft, and the collecting portion moves in the axial direction of the first shaft.
In some embodiments, the sedimentation collection member comprises a plurality of flukes, each of which is provided at a different depth in the earth's surface, the flukes being connected to the connection line.
In some embodiments, the wire takeup member further comprises a pulley adapted to carry the connecting rope, and the data acquisition member further comprises a second angle measuring member coupled to the pulley to monitor an angle of rotation of the pulley.
In some embodiments, the number of the wire rewinding members and the number of the first angle measuring members are multiple, and the multiple wire rewinding members and the multiple first angle measuring members correspond to each other in a one-to-one manner.
In some embodiments, the sedimentation monitoring device further comprises a positioning receiver, a battery component and a first rod, wherein one end of the positioning receiver is connected with the first rod, the other end of the first rod is connected with the ground, and the battery component is connected with the positioning receiver.
In some embodiments, the sedimentation monitoring device further comprises a light energy charging member adapted to generate electrical energy using light energy, the light energy charging member being connected to the battery part to charge the battery part.
In some embodiments, the sedimentation monitoring device further comprises a controller and a signal transmission member, the controller is connected with the collecting member and the positioning receiver to collect monitoring data, and the controller is connected with the signal transmission member to transmit the monitoring data to a monitoring station.
Drawings
FIG. 1 is a schematic diagram of a data collection assembly of an embodiment of the present invention. .
Fig. 2 is a schematic view of a settlement monitoring device according to an embodiment of the present invention.
The connection line 1, the positioning receiver 2,
a data collecting assembly 3, a wire take-up member 31, a first shaft 311, a fixing base 312, a collecting member 313, a collecting portion 3131, a wire groove 31311, a coil spring 3132, a pulley 314, a data collecting member 32, a first angle measuring member 321,
the device comprises a battery component 4, a first rod 5, a light energy charging piece 6, a controller 7, a signal transmission piece 8, a sliding rail 9, a sliding block 10 and a ground 11.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are illustrative and intended to explain the present invention and should not be construed as limiting the present invention.
The settlement monitoring device comprises a connecting wire 1, a settlement collecting component and a data collecting component 3, wherein one end of the settlement collecting component is suitable for being inserted into the ground surface to collect settlement, the data collecting component 3 comprises a wire collecting component 31 and a data collecting component 32, one end of the wire collecting component 31 is connected with the settlement collecting component, the other end of the wire collecting component 31 is connected with the data collecting component 32, one end of the connecting wire 1 is connected with the wire collecting component 31, and the other end of the connecting wire 1 is connected with the settlement collecting component.
Specifically, as shown in fig. 1 and fig. 2, the lower end of the settlement collecting component extends into the ground surface, for example, the lower end of the settlement collecting component is connected with the surface soil layer, the upper end of the settlement collecting component is connected with one end of the connecting wire 1, the other end of the connecting wire 1 is connected with the wire collecting component 31, the connecting wire 1 is collected or released by the wire collecting component 31, for example, the connecting wire 1 can be wound on the outer peripheral surface of the wire collecting component 31, when the surface soil layer in the goaf is settled, the settlement collecting component is settled along with the surface soil layer, the connecting wire 1 descends along with the settlement collecting component, further, the length of the connecting wire 1 collected by the wire collecting component 31 can be changed, and the data collecting component 32 monitors the length change of the connecting wire 1 on the wire collecting component 31, so as to calculate the data of the surface soil layer settlement. Alternatively, the connection line 1 may be a steel wire rope.
According to the settlement monitoring device provided by the embodiment of the invention, the connection wire 1 can be wound on the outer peripheral surface of the wire take-up component 31 by arranging the wire take-up component 31 and the data acquisition component 32, so that the reduction of the measurement precision can be avoided, and compared with the method for calculating the length change of the connection wire 1 by the measuring pulley 314 in the related art, the settlement monitoring device provided by the embodiment of the invention can improve the accuracy of settlement monitoring data.
In some embodiments, the wire rewinding member 31 includes a first shaft 311, a fixing seat 312 and a collecting member 313, the data collecting member 32 includes a first angle measuring member, the fixing seat 312 has a receiving cavity, the first shaft 311 and the collecting member 313 are disposed in the receiving cavity, the collecting member 313 is sleeved on the first shaft 311, the first shaft 311 is provided with an external thread, the collecting member 313 is provided with an internal thread connected with the external thread, the collecting member 313 is rotatable relative to the first shaft 311, the other end of the connecting rope is connected with the collecting member 313, and the first angle measuring member 321 is sleeved on the first shaft 311 to monitor the rotation angle of the collecting member 313.
Specifically, as shown in fig. 1 and fig. 2, a holding cavity is formed in the fixing seat 312, the collecting element 313 and the first shaft 311 are arranged in the holding cavity, the outer peripheral surface of the collecting element 313 is used for winding the connecting line 1, a through hole is formed in the collecting element 313, an internal thread is formed in the through hole, the first shaft 311 is provided with an external thread connected with the internal thread of the collecting element 313, the first shaft 311 is rotatable relative to the fixing seat 312, the collecting element 313 is rotatable relative to the first shaft 311, the first angle measuring part 321 is sleeved at one end of the first shaft 311 away from the collecting element 313, for example, the first angle measuring part 321 is sleeved at the right end of the first shaft 311, the first angle measuring part 321 is used for monitoring the rotation angle of the collecting element 313, and then the ascending or descending distance of the connecting line 1 is calculated, and then the settlement amount of the surface soil layer is calculated.
When the sedimentation monitoring device is installed, the connecting line 1 is wound on the outer peripheral surface of the collecting piece 313, and then when the connecting line 1 ascends or descends, the collecting piece 313 rotates relative to the first shaft 311, and the collecting piece 313 moves in the left-right direction relative to the first shaft 311, so that the connecting line 1 is prevented from being stacked when being released or collected, the precision of the first angle measuring component 321 in measuring the ascending or descending of the connecting line 1 is improved, and the stability and the safety of the sedimentation monitoring device are improved.
Alternatively, the collecting member 313 includes a collecting portion 3131 and a coil spring 3132, the collecting portion 3131 is provided with an internal thread, the collecting portion 3131 is sleeved on the first shaft 311, one end of the coil spring 3132 is connected to the fixing base 312, and the other end of the coil spring 3132 is connected to the collecting portion 3131 to maintain tension between the collecting portion 3131 and the connection line 1.
The collecting portion 3131 collects or releases the connection wire 1, and the first angle measuring member 321 monitors an angle at which the collecting portion 3131 rotates.
One end of the collecting part 3131 is connected to the coil spring part 3132 to keep the tension between the collecting part 3131 and the connection wire 1, and when the sedimentation monitoring device is installed, the tension between the coil spring part 3132 and the collecting part 3131 may be adjusted according to actual requirements to adapt to different use environments.
In some embodiments, the collecting portion 3131 is provided with a wire groove 31311, the wire groove 31311 is spirally provided on an outer wall surface of the collecting portion 3131 in an axial direction of the first shaft 311, and the collecting portion 3131 moves upward in the axial direction of the first shaft 311.
Specifically, as shown in fig. 1 and 2, the outer circumferential surface of the collecting portion 3131 is provided with a wire groove 31311, the wire groove 31311 is spirally disposed on the outer circumferential surface of the collecting portion 3131, and the wire groove 31311 is adapted to place the connection wire 1 to limit the connection wire 1, prevent the connection wire 1 from being laminated, improve stability and safety of the sedimentation monitoring device,
in some embodiments, the sedimentation collection element comprises a plurality of flukes, each arranged at a different depth in the earth's surface, which flukes are connected to the connection line 1.
Specifically, as shown in fig. 1 and fig. 2, the plurality of flukes are respectively arranged at different depths of the ground surface, that is, the plurality of flukes are arranged in different soil layers of the ground surface, and further, when the ground surface soil layer is settled, the flukes are lifted along with the soil layer and can descend, and the other ends of the flukes are connected with the connecting line 1.
In some embodiments, the wire takeup member 31 further includes a pulley 314, the pulley 314 being adapted to carry the connection wire 1, and the data acquisition member further includes a second angle measuring member coupled to the pulley 314 to monitor the angle of rotation of the pulley 314.
Specifically, as shown in fig. 1 and fig. 2, the pulley 314 is suitable for bearing the connecting line 1, when the connecting line 1 moves up and down, the pulley 314 can rotate, the second angle measuring component can measure the rotation angle of the pulley 314, and then measure the distance that the connecting line 1 moves up and down, so as to obtain the data of surface soil layer settlement, further, the pulley 314 is arranged between the fluke and the collecting piece 313, so that the blocking caused when the connecting line 1 moves up and down can be avoided, and the stability and the safety of the settlement monitoring device can be improved.
Further, the settlement monitoring device further comprises a sliding rail 9 and a sliding block 10, a channel is arranged in the sliding block 10, the channel is suitable for the connecting wire 1 to pass through, the connecting wire 1 is suitable for entering through the channel, the sliding rail is arranged on the fixed seat 312, the sliding block 10 can move left and right relative to the sliding rail 9, the smoothness of the left and right movement of the connecting wire 1 can be improved, and the stability and the safety of the settlement monitoring device are improved.
In some embodiments, the number of the wire rewinding members 31 and the number of the first angle measuring members 321 are multiple, and the multiple wire rewinding members 31 and the multiple first angle measuring members 321 correspond to each other one by one, so that the monitoring range of the sedimentation monitoring device and the stability and the safety of the sedimentation monitoring device are improved.
In some embodiments, the sedimentation monitoring device further comprises a positioning receiver 2, a battery part 4 and a first rod 5, the positioning receiver 2 being connected at one end to the first rod 5, the other end of the first rod 5 being connected to the ground 11, the battery part 4 being connected to the positioning receiver 2.
Specifically, as shown in fig. 1 and fig. 2, the positioning receiver 2 may be a GNSS receiver, the positioning receiver 2 may monitor the height of the ground 11 and the distance between the monitoring location and the monitoring station on the ground 11 in real time, and the battery component 4 is connected to the positioning receiver 2 to supply power to the positioning receiver 2, so as to improve the stability and the safety of the settlement monitoring device. The battery part 4 may also supply power to the first angle measuring part 321 and the second angle measuring part.
Optionally, the settlement monitoring device further comprises a light energy charging element 6, the light energy charging element 6 is suitable for generating electric energy by using light energy, and the light energy charging element 6 is connected with the battery component 4 to charge the battery component 4, so that the service time of the settlement monitoring device is prolonged, and the stability and the safety of the settlement monitoring device are further improved.
In some embodiments, the sedimentation monitoring device further comprises a controller 7 and a signal transmission member 8, the controller 7 being connected to the collecting member 313 and the positioning receiver 2 for collecting monitoring data, the controller 7 being connected to the signal transmission member 8 for transmitting the monitoring data to the monitoring station.
Specifically, as shown in fig. 1 and fig. 2, the controller 7 is connected with the battery component 4, the first measuring component and the second angle measuring component in a one-to-one correspondence manner to collect the settlement monitoring data, and then the controller 7 can transmit the settlement monitoring data to a ground 11 monitoring station through the signal transmission component 8, so that the stability and the safety of the settlement monitoring device are improved.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being permanently connected, detachably connected, or integral; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the second feature or the first and second features may be indirectly contacting each other through intervening media. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A settlement monitoring device, comprising:
a settlement collecting member having one end adapted to be inserted into the ground surface to collect a settlement amount;
the data collection assembly comprises a wire collection component and a data collection component, one end of the wire collection component is connected with the sedimentation collection component, and the other end of the wire collection component is connected with the data collection component;
and one end of the connecting wire is connected with the wire collecting component, and the other end of the connecting wire is connected with the sedimentation collecting component.
2. The sedimentation monitoring apparatus according to claim 1, wherein the take-up member includes a first shaft, a fixing base, and a collecting member, the data collecting member includes a first angle measuring member, the fixing base has a receiving cavity, the first shaft and the collecting member are disposed in the receiving cavity, the collecting member is sleeved on the first shaft, the first shaft is provided with an external thread, the collecting member is provided with an internal thread connected with the external thread, the collecting member is rotatable relative to the first shaft, the other end of the connecting rope is connected with the collecting member, and the first angle measuring member is sleeved on the first shaft to monitor a rotation angle of the collecting member.
3. The sedimentation monitoring apparatus according to claim 2, wherein the collecting member includes a collecting portion and a coil spring portion, the collecting portion is provided with the internal thread, the collecting portion is sleeved on the first shaft, one end of the coil spring portion is connected to the fixing base, and the other end of the coil spring portion is connected to the collecting portion so that the collecting portion and the connecting wire are kept tensioned.
4. The sedimentation monitoring device according to claim 2, wherein the collecting portion is provided with a wire groove that is provided spirally on an outer wall surface of the collecting portion in an axial direction of the first shaft, the collecting portion moving in the axial direction of the first shaft.
5. The settlement monitoring device of claim 1, wherein the settlement gathering member comprises a plurality of flukes, each disposed at a different depth in the earth's surface, the flukes being connected to the connecting line.
6. The sedimentation monitoring device according to claim 1 wherein the wire takeup member further comprises a pulley adapted to carry the connection rope, the data acquisition member further comprises a second angle measuring member connected to the pulley to monitor an angle of rotation of the pulley.
7. The sedimentation monitoring device according to any one of claims 1 to 6, wherein the number of the wire take-up members and the first angle measuring members is plural, and plural wire take-up members correspond one-to-one to plural first angle measuring members.
8. The sedimentation monitoring apparatus according to claim 2 further comprising a positioning receiver, a battery member and a first rod, the positioning receiver having one end connected to the first rod and the other end connected to the ground, the battery member being connected to the positioning receiver.
9. The sedimentation monitoring device according to claim 8 further comprising a light energy charging member adapted to generate electrical energy using light energy, the light energy charging member being connected to the battery part to charge the battery part.
10. The settlement monitoring device of claim 9, further comprising a controller and a signal transmitter, the controller being coupled to the collecting member and the positioning receiver to collect the monitoring data, the controller being coupled to the signal transmitter to transmit the monitoring data to a monitoring station.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211302958.7A CN115493558A (en) | 2022-10-24 | 2022-10-24 | Settlement monitoring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211302958.7A CN115493558A (en) | 2022-10-24 | 2022-10-24 | Settlement monitoring device |
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| CN115493558A true CN115493558A (en) | 2022-12-20 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10206198A (en) * | 1997-01-20 | 1998-08-07 | Oyo Corp | Apparatus for detecting collapse of rock |
| KR20130000681A (en) * | 2011-06-23 | 2013-01-03 | 한국광해관리공단 | Apparatus and method for measuring multi-layer underground settlement |
| CN205120093U (en) * | 2015-10-30 | 2016-03-30 | 浙江大学 | Novel test is subsided on earth's surface device |
| CN109592486A (en) * | 2018-12-18 | 2019-04-09 | 新乡市恒德机电有限公司 | A kind of high-efficiency cable reel with automatic row's cable function |
| CN110388893A (en) * | 2019-08-16 | 2019-10-29 | 湖南联智桥隧技术有限公司 | Long-range safety monitoring slope data acquisition device based on Beidou data communication |
-
2022
- 2022-10-24 CN CN202211302958.7A patent/CN115493558A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10206198A (en) * | 1997-01-20 | 1998-08-07 | Oyo Corp | Apparatus for detecting collapse of rock |
| KR20130000681A (en) * | 2011-06-23 | 2013-01-03 | 한국광해관리공단 | Apparatus and method for measuring multi-layer underground settlement |
| CN205120093U (en) * | 2015-10-30 | 2016-03-30 | 浙江大学 | Novel test is subsided on earth's surface device |
| CN109592486A (en) * | 2018-12-18 | 2019-04-09 | 新乡市恒德机电有限公司 | A kind of high-efficiency cable reel with automatic row's cable function |
| CN110388893A (en) * | 2019-08-16 | 2019-10-29 | 湖南联智桥隧技术有限公司 | Long-range safety monitoring slope data acquisition device based on Beidou data communication |
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