CN110954961B - Large-sector mine working face radio wave penetration system and method - Google Patents
Large-sector mine working face radio wave penetration system and method Download PDFInfo
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- CN110954961B CN110954961B CN201911158315.8A CN201911158315A CN110954961B CN 110954961 B CN110954961 B CN 110954961B CN 201911158315 A CN201911158315 A CN 201911158315A CN 110954961 B CN110954961 B CN 110954961B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/18—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging
- G01V3/30—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging operating with electromagnetic waves
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention belongs to the technical field of mine exploration and discloses a large-sector mine working face radio wave penetration system and a method, wherein the system comprises a transmitter, a receiving master station, a relay station and a plurality of receivers, the transmitter is arranged at the position of a transmitting point in a mine transmitting roadway, and the plurality of receivers are arranged at a plurality of receiving points of the mine receiving roadway and used for receiving signals sent by the transmitter; the receivers are connected with the receiving master station through communication cables in sequence, and the relay stations are arranged among the receivers at intervals and used for improving the communication quality and speed among the receivers. When the transmitter of the transmitting point transmits signals, the receivers of the plurality of receiving points simultaneously receive the signals transmitted by the transmitter.
Description
Technical Field
The invention belongs to the technical field of mine exploration, and particularly relates to a large-sector mine working face radio wave penetration system and method capable of improving longitudinal resolution of a detection area.
Background
In the beginning of the 20 th century and the 70 th century, related research and development are carried out aiming at a mine working face radio wave penetration instrument in China, and certain achievements are achieved in the aspect of detecting a concealed collapse column existing in the mine working face in a mining face. With the construction of modern mines, a geological fine detection technology is the guarantee of efficient and safe production of the mines. The radio wave hole penetration technology is widely applied to the structural detection of a mine stope face, but the disadvantage of low longitudinal resolution of a collapse column by the radio wave hole penetration technology is not suitable for modern mines, as shown in fig. 1, the conventional hole penetration technology in the prior art generally adopts a fixed-point method, namely, a transmitter transmits in one roadway, a receiver receives in the other roadway, and then the transmitter is moved while the receiver is moved to receive again. The system has the advantages of strong adaptability to underground conditions, stable performance, reliable data and the like. However, due to the defects that the conventional pit penetration observation system has a small receiving surface and short transmission distance and the longitudinal resolution of the detection result is poor, as shown in fig. 2, the delineation abnormality of the pit penetration system of the conventional system is mostly in the form of a rectangular strip, and the use and popularization of the mine pit penetration method are severely restricted.
Disclosure of Invention
The invention overcomes the defects of the prior art, and solves the technical problems that: a large sector mine working face radio wave pit penetration system is provided to improve the longitudinal resolution of the mine pit penetration.
In order to solve the technical problems, the invention adopts the technical scheme that: a large sector mine working face radio wave pit penetration system comprises a transmitter, a receiving master station, a relay station and a plurality of receivers, wherein the transmitter is arranged at a transmitting point in a mine transmitting roadway, and the receivers are arranged at a plurality of receiving points of a mine receiving roadway and used for receiving signals sent by the transmitter; the receivers are connected with a receiving master station through communication cables in sequence, and the relay stations are arranged among the receivers at intervals and are used for improving the communication quality and speed among the receivers; when the transmitter of the transmitting point transmits a signal, the receivers of the plurality of receiving points simultaneously receive the signal transmitted by the transmitter.
The receiving points are spaced apart by 10m and the receiving distance is typically 2 times the width of the incision.
A plurality of transmitting points are arranged in a mine roadway, the interval between the transmitting points is 30-50 meters, and the transmitters sequentially transmit signals at the transmitting points.
The setting interval of the relay station is 200 m.
The large-sector mine working face radio wave pit penetration system further comprises a plurality of intrinsic safety type power supplies, and every 5 receivers share one intrinsic safety type power supply.
The transmitting frequency of the transmitter is as follows: 80KHz, 160KHz, 300KHz, 500KHz, 1000KHz, time synchronization with the receiving head station, radio frequency power: less than or equal to 10W, and the effective penetration distance reaches 500 m; the receiving frequency of the receiver is as follows: 80KHz, 160KHz, 300KHz, 500KHz, 1000KHz, the sampling rate is: and the receiving master station comprises an FPGA processor, a memory, a display and an RS485 communication module, and the relay station is used for receiving and transmitting an RS485 bus signal of the receiver.
The invention also provides a large-sector mine working face radio wave pit penetration method, and the large-sector mine working face radio wave pit penetration system comprises the following steps:
s1, installing a receiver and a relay station in a mine launching roadway, and connecting the receiver and the relay station with a receiving master station after the receiver and the relay station are connected with each other; simultaneously, time correction is carried out on the transmitter and the receiving master station;
s2, fixing the transmitter at the transmitting point of the mine receiving roadway, enabling the transmitter to continuously transmit signals for 30S, and recording the field intensity value received by each receiver through the receiving master station;
s3, turning off the transmitter and the receiver, moving the transmitter to the next transmission point for fixing, and repeating the measurement of the step S2 until all the transmission points are traversed;
and S4, exchanging the transmitting roadway and the receiving roadway, and repeating the measurement of the steps S1-S3.
Compared with the prior art, the invention has the following beneficial effects: the invention provides a large-sector mine working face radio wave pit penetration system, which adopts a 'one-shot-multiple-shot' observation system, the shape of a defined collapse column is basically similar to the size and shape of a collapse column disclosed by actual recovery, the inversion result of an X1 collapse column has accurate range and position and good longitudinal accuracy, and the longitudinal resolution of the detection result of a hidden collapse column is improved.
Drawings
FIG. 1 is a schematic diagram of a prior art mine face radio wave tunneling system;
FIG. 2 is a diagram of observations of a prior art mine face radio wave penetration system;
fig. 3 is a schematic structural diagram of a large sector mine working face radio wave penetration system according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of the working principle of an embodiment of the present invention;
fig. 5 is a graphical representation of results obtained from prior art and the present invention pit penetration measurements on a coal mine.
In the figure: the system comprises a transmitter 1, a transmitter transmitting coil 2, a receiver 3, a relay station 4, an intrinsic safety power supply 5, a receiving master station 6, a return air roadway 7, a cutting hole 8, a transport gateway roadway 9, a return air gateway roadway 10, a transmitting point 11, a receiving point 12 and a pit transmission field intensity ray 13.
Detailed Description
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, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments; 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.
As shown in fig. 3, the embodiment of the present invention provides a large sector mine working face radio wave penetration system, which includes a transmitter 1, a receiving master station 6, a relay station 4 and a plurality of receivers 3, wherein the transmitter 1 is arranged at a transmitting point 11 in a mine transmitting roadway, the plurality of receivers 1 are arranged at a plurality of receiving points 12 in the mine receiving roadway, the receivers 3 are connected in sequence through communication cables and then connected with the receiving master station 6, and the relay stations 4 are arranged among the receivers 3 at intervals for improving the communication quality and speed among the receivers 3. When the transmitter 1 of a transmission point transmits a signal, the receivers 3 of a plurality of reception points simultaneously receive the signal transmitted by the transmitter 1.
The invention increases the transmitter power of the radio wave pit penetration instrument, increases the transmission distance, and enlarges the receiving angle and area by arranging a plurality of receivers to receive the field intensity simultaneously, thereby finally achieving the purpose of high resolution and delineating the collapse column in the working surface. The pit penetration system transmits in one roadway and receives in the other roadway, the distance between transmitting points is generally 30 m-50 m, and the distance between receiving points is 10m according to the determination of field conditions.
In the embodiment of the invention, in order to ensure the communication quality and speed, a plurality of receivers are connected through communication lines and finally connected to a receiving master station, in order to ensure the communication quality and speed, a relay station is used for connection every 200m to increase the strength of communication signals, and every 5 receivers share one intrinsic safety type power supply; the transmitter is fixed at a transmitting point and continuously transmits a signal for 30s, and moves to the next transmitting point; the receiving central station records the field strength value received by each receiver. The observation system generally adopts fixed point transmission, when each transmission point transmits a signal, a plurality of receiving points simultaneously receive the signal transmitted by the point, and the receiving distance is generally 2 times of the width of the incision.
Specifically, in this embodiment, the transmitter adopts a high-power multi-frequency transmitter, and the transmission frequency thereof is: 80KHz, 160KHz, 300KHz, 500KHz, 1000KHz, time synchronization with the receiving head station, radio frequency power: less than or equal to 10W, and the effective penetration distance reaches 500 m; the receiving frequency of the receiver is as follows: 80KHz, 160KHz, 300KHz, 500KHz, 1000KHz, with one-of-five programmed switch switching, sampling rate: 40MHz, memory: 32MB dynamic SDRAM, store: 64MB QSPI private high-speed memory, power control: keyboard + program control, communication mode is RS 485. The receiving master station comprises an ARM + FPGA, the FPGA is a special SOC microprocessor for NiosII/f, and the receiving master station comprises a memory: 64MB dynamic SDRAM, storing: the display is 7.0 inches of true color TFT liquid crystal, the communication module comprises an RS485 communication module and a USB module, and the receiving system is reliable. The relay station is used for receiving and transmitting RS485 bus signals of the receiver. The intrinsic safety type power supply is used for supplying power to the receiver and the relay station, and can continuously and stably supply power for 8 hours.
In addition, the embodiment of the invention also provides a large sector mine working face radio wave pit penetration method, and the large sector mine working face radio wave pit penetration system comprises the following steps:
s1, installing a receiver and a relay station in a mine launching roadway, and connecting the receiver and the relay station with a receiving master station after the receiver and the relay station are connected with each other; simultaneously, time correction is carried out on the transmitter and the receiving master station;
s2, fixing the transmitter at the transmitting point of the mine receiving roadway, enabling the transmitter to continuously transmit signals for 30S, and recording the field intensity value received by each receiver through the receiving master station;
s3, turning off the transmitter and the receiver, moving the transmitter to the next transmission point for fixing, and repeating the measurement of the step S2 until all the transmission points are traversed;
and S4, exchanging the transmitting roadway and the receiving roadway, and repeating the measurement of the steps S1-S3.
In the embodiment of the invention, the time correction of the transmitting host and the receiving host is carried out before the system equipment is installed, so that the time consistency of the transmitting host and the receiving host is ensured, and the time is used for distinguishing the data received by each receiving substation and the receiving position of each data.
After the equipment is debugged, data acquisition work is carried out, the transmitter and the receiving master station are respectively controlled to work, the transmitting time of each transmitting point is set to be 30s, each receiver simultaneously receives signals within 30s, and the signals are transmitted to the receiving master station through the relay station and the communication line. When the emission of the emission point is finished, the emitter is closed, then the emitter is moved to the next emission point within 1 minute, and then the emission is continued; the receiving master station controls each receiver, stops receiving data in the process of moving the station for 1 minute, and automatically starts receiving signals after 1 minute. In order to make the collected data more accurate, the transmitting and receiving tunnels are usually swapped, and data collection is performed again. And after two rounds of data acquisition are completed, the underground data acquisition work is finished. Since processing data by a receiver is conventional in the art, it is not described in detail herein.
Take the stope face of a coal mine as an example. As shown in a in fig. 5, the trapping column delineated by the existing observation system and method is a strip-shaped anomaly, but the position of the specific trapping column cannot be longitudinally resolved, and the delineating X1 in the figure is the size and the position of the trapping column after mining extraction. As shown in b in fig. 5, which is a schematic diagram of the results obtained by performing the penetration measurement on the coal mine according to the present invention, it can be seen from the figure that the size and the shape of the trapping column defined by the present invention are substantially the same as those of the trapping column disclosed in the actual recovery (defined X1), and the problem of the longitudinal resolution of the trapping column is effectively solved.
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. A large sector mine working face radio wave pit penetration system is characterized by comprising a transmitter, a receiving master station, a relay station and a plurality of receivers, wherein the transmitter is arranged at a transmitting point in a mine transmitting roadway, and the receivers are arranged at a plurality of receiving points of the mine receiving roadway and used for receiving signals sent by the transmitter; the receivers are connected with the receiving master station in sequence through communication cables, and the relay stations are arranged among the receivers at intervals and are used for improving the communication quality and speed among the receivers; when a transmitter of a transmitting point transmits signals, receivers of a plurality of receiving points receive the signals transmitted by the transmitter simultaneously; the transmitter comprises a plurality of transmitting frequencies, the receiver comprises a plurality of corresponding receiving frequencies, and the receiving frequencies are controlled by the programmable switch.
2. A large sector mine working face radio wave penetration system according to claim 1, wherein the receiving points are spaced 10m apart and the receiving distance is 2 times the width of the cut-out.
3. The large sector mine working face radio wave penetration system according to claim 1, wherein a plurality of transmitting points are arranged in a mine roadway, the interval between the transmitting points is 30-50 meters, and the transmitter sequentially transmits signals at the transmitting points.
4. The large sector mine working face radio wave penetration system according to claim 1, wherein the relay stations are arranged at intervals of 200 m.
5. The large sector mine face radio wave penetration system of claim 1, further comprising a plurality of intrinsically safe power supplies, one intrinsically safe power supply for each 5 of the receivers.
6. The large sector mine working face radio wave tunneling system according to claim 1, wherein the transmitter has a transmission frequency of: 80KHz, 160KHz, 300KHz, 500KHz, 1000KHz, time synchronization with the receiving head station, radio frequency power: less than or equal to 10W, and the effective penetration distance reaches 500 m; the receiving frequency of the receiver is as follows: 80KHz, 160KHz, 300KHz, 500KHz, 1000KHz, the sampling rate is: and the receiving master station comprises an FPGA processor, a memory, a display and an RS485 communication module, and the relay station is used for receiving and transmitting an RS485 bus signal of the receiver.
7. A large sector mine working face radio wave penetration method, which adopts the large sector mine working face radio wave penetration system of claim 1, and is characterized by comprising the following steps:
s1, installing a receiver and a relay station in a mine receiving roadway, and connecting the receiver and the relay station with a receiving master station after the receiver and the relay station are connected with each other; simultaneously, time correction is carried out on the transmitter and the receiving master station;
s2, fixing the transmitter at the transmitting point of the mine transmitting roadway, enabling the transmitter to continuously transmit signals for 30S, and recording the field intensity value received by each receiver through the receiving master station;
s3, turning off the transmitter and the receiver, moving the transmitter to the next transmission point for fixing, and repeating the measurement of the step S2 until all the transmission points are traversed;
and S4, exchanging the transmitting roadway and the receiving roadway, and repeating the measurement of the steps S1-S3.
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4577153A (en) * | 1985-05-06 | 1986-03-18 | Stolar, Inc. | Continuous wave medium frequency signal transmission survey procedure for imaging structure in coal seams |
| CN101349744A (en) * | 2008-06-27 | 2009-01-21 | 重庆智溢科技有限公司 | Method and system for tracking and positioning downhole personnel based on Zigbee network platform |
| CN102385070A (en) * | 2011-08-23 | 2012-03-21 | 安徽理工大学 | Radio wave perspective captive test (CT) method for overlong working surface |
| CN102928887A (en) * | 2012-10-22 | 2013-02-13 | 北京华安奥特科技有限公司 | Integrated signal receiving device of radio trench scenograph |
| CN103259101A (en) * | 2012-02-20 | 2013-08-21 | 淮南矿业(集团)有限责任公司 | Radio wave receiving antenna, receiving device, perspective system and detecting method |
| CN103675924A (en) * | 2013-12-16 | 2014-03-26 | 淮南矿业(集团)有限责任公司 | Tunnel radio-wave penetration collection system |
| CN203606514U (en) * | 2013-12-16 | 2014-05-21 | 淮南矿业(集团)有限责任公司 | Gallery penetration acquisition system |
| CN105119613A (en) * | 2015-07-17 | 2015-12-02 | 长沙巨丰软件科技有限公司 | Device and method for performing data transmission in mine network-free state |
| CN106772642A (en) * | 2017-01-03 | 2017-05-31 | 吉林大学 | The nuclear magnetic resonance that a kind of earth electric field is excited visits water system and outdoor operation method |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8797037B2 (en) * | 2008-04-11 | 2014-08-05 | Baker Hughes Incorporated | Apparatus and methods for providing information about one or more subterranean feature |
| CN101581789A (en) * | 2009-06-23 | 2009-11-18 | 刘盛东 | Mine working face inter-lane seismic wave CT detection method |
| CN102681017B (en) * | 2012-05-31 | 2014-11-05 | 河北煤炭科学研究院 | Amplitude-frequency electric perspective detection method |
| CN204287508U (en) * | 2014-10-22 | 2015-04-22 | 安徽理工大学 | Between two lane, multicast radiowave cheats field strength measurement system |
| CN104459807A (en) * | 2014-10-22 | 2015-03-25 | 安徽理工大学 | One-sending and multi-receiving radio wave tunnel penetration field strength measuring system and method between double roadways |
-
2019
- 2019-11-22 CN CN201911158315.8A patent/CN110954961B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4577153A (en) * | 1985-05-06 | 1986-03-18 | Stolar, Inc. | Continuous wave medium frequency signal transmission survey procedure for imaging structure in coal seams |
| CN101349744A (en) * | 2008-06-27 | 2009-01-21 | 重庆智溢科技有限公司 | Method and system for tracking and positioning downhole personnel based on Zigbee network platform |
| CN102385070A (en) * | 2011-08-23 | 2012-03-21 | 安徽理工大学 | Radio wave perspective captive test (CT) method for overlong working surface |
| CN103259101A (en) * | 2012-02-20 | 2013-08-21 | 淮南矿业(集团)有限责任公司 | Radio wave receiving antenna, receiving device, perspective system and detecting method |
| CN102928887A (en) * | 2012-10-22 | 2013-02-13 | 北京华安奥特科技有限公司 | Integrated signal receiving device of radio trench scenograph |
| CN103675924A (en) * | 2013-12-16 | 2014-03-26 | 淮南矿业(集团)有限责任公司 | Tunnel radio-wave penetration collection system |
| CN203606514U (en) * | 2013-12-16 | 2014-05-21 | 淮南矿业(集团)有限责任公司 | Gallery penetration acquisition system |
| CN105119613A (en) * | 2015-07-17 | 2015-12-02 | 长沙巨丰软件科技有限公司 | Device and method for performing data transmission in mine network-free state |
| CN106772642A (en) * | 2017-01-03 | 2017-05-31 | 吉林大学 | The nuclear magnetic resonance that a kind of earth electric field is excited visits water system and outdoor operation method |
Non-Patent Citations (1)
| Title |
|---|
| 张平松 等."煤层工作面地质构造及异常透射CT综合成像方法与应用".《中国煤炭地质》.2017,第29卷(第9期), * |
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