CN109217896A - A kind of communication device and its working method of mining CT transmission geological radar - Google Patents
A kind of communication device and its working method of mining CT transmission geological radar Download PDFInfo
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- CN109217896A CN109217896A CN201811424738.5A CN201811424738A CN109217896A CN 109217896 A CN109217896 A CN 109217896A CN 201811424738 A CN201811424738 A CN 201811424738A CN 109217896 A CN109217896 A CN 109217896A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
-
- 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
- G01V3/12—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with electromagnetic waves
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/071—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using a reflected signal, e.g. using optical time domain reflectometers [OTDR]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2589—Bidirectional transmission
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2589—Bidirectional transmission
- H04B10/25891—Transmission components
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/29—Repeaters
- H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
- H04B10/298—Two-way repeaters, i.e. repeaters amplifying separate upward and downward lines
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/64—Automatic arrangements for answering calls; Automatic arrangements for recording messages for absent subscribers; Arrangements for recording conversations
- H04M1/65—Recording arrangements for recording a message from the calling party
- H04M1/6505—Recording arrangements for recording a message from the calling party storing speech in digital form
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Electromagnetism (AREA)
- Computer Networks & Wireless Communication (AREA)
- Life Sciences & Earth Sciences (AREA)
- Remote Sensing (AREA)
- Environmental & Geological Engineering (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Geophysics (AREA)
- Optical Communication System (AREA)
Abstract
The invention discloses the communication devices and its working method of a kind of mining CT transmission geological radar.A kind of communication device of mining CT transmission geological radar includes: radar trigger signal generator, radar trigger signal receiver, voice collecting and play system, optical fiber, fibre optic repeater, power supply.There are two its major functions: first is that the real-time Transmission of mining CT transmission geological radar trigger signal, second is that the voice real-time communication of operating personnel.This communication device and its working method, when solving large span working face CT detection under Mine Complicated environment, the long range real-time Transmission of geological radar trigger signal and the real-time communication problem of operating personnel simplify the structure of CT transmission geological radar.
Description
Technical field
The present invention relates to Ground Penetrating Radar field more particularly to a kind of communication devices and its work of mining CT transmission geological radar
Make method.
Background technique
Mining CT transmission geological radar is a kind of quick, efficient, lossless detection physical prospecting detection method, in use, by mine
The corresponding two sides of working face are respectively placed in the transmitting antenna of CT transmission geological radar and receiving antenna, are sent out using transmitting antenna
Radio magnetic wave, and receiving antenna receive across working face electromagnetic wave, then to obtain data are analyzed and processed, and then
The image information constructed in working face body.
Currently, there are problems that two: (1) current to visit ground when complicated ore underground carries out the CT detection of large span working face
Radar CT transmission detection, the transmission precision of radar trigger signal is all nanosecond, mine very high to requirement of real-time, current
Wireless communication system, precision are all Milliseconds, and wireless communication can not meet actual demand.(2) CT is transmitted in operation process, work
The operating personnel for making face two sides is also required to exchange, due to being limited by underground space labyrinth body and large span working face,
The wireless signal of wireless interspeaker is often blocked or shields, and underground telephone communication modes, not only needs cloth again
If telephone wire, but also limited by telephone set base station location and distance.Therefore, when current underground CT transmission detection, radar
Communication between transmitting antenna operating personnel and radar receiving antenna operating personnel is often using mode of propagandaing directed to communicate, this exchange
Mode low efficiency, convenience is poor, when such as encountering large span working face or longer survey line, multiple personnel is needed to assist using passing on a message
It helps completion to communicate, causes great personnel to waste, and seriously affect working efficiency.
Therefore, how the demand detected for large span working face CT under Mine Complicated environment comprehensively considers radar triggering
Signal transmission and people communication's transmission mode solve long range real-time Transmission and the operating personnel of geological radar trigger signal
Real-time communication problem and the structure for simplifying CT transmission geological radar, are those skilled in the art's urgent problems to be solved.
Summary of the invention
The object of the present invention is to provide the communication devices and its working method of a kind of mining CT transmission geological radar.It is main
There are two effects: first is that the real-time Transmission of mining CT transmission geological radar trigger signal, second is that the voice of operating personnel leads in real time
News.This communication device and its working method, when solving large span working face CT detection under Mine Complicated environment, geological radar touching
The long range real-time Transmission of signalling and the real-time communication problem of operating personnel simplify the structure of CT transmission geological radar.
To achieve the above object, the present invention provides following schemes: the present invention provides a kind of mining CT transmission geological radar
Communication device and its working method, which includes: radar trigger signal hair
Raw device, radar trigger signal receiver, voice collecting and play system, optical fiber, fibre optic repeater, power supply.
Preferably, the communication device and its working method, main purpose be solve Mine Complicated environment under greatly across
When spending working face CT detection, the long range real-time Transmission of geological radar trigger signal and the real-time communication problem of operating personnel, together
When simplify CT transmission geological radar structure.
Preferably, the radar trigger signal generator, the signal generated are pulse signal；Radar trigger signal hair
There are two interfaces for raw device, and one connect with transmitting unit, launch outward electromagnetic wave for triggering transmitting unit, another and optical fiber
Connection, transmission pulse signal give radar trigger signal receiver.
Preferably, the radar trigger signal receiver, there are two interfaces, and one connect with optical fiber, and reception comes from
In the pulse signal of optical fiber transmission；Another connect with acquisition unit, is used to triggering collection unit and acquires reflection electromagnetic wave.
Preferably, the voice collecting and play system, comprising: MCU controller, key module, LED lamp module, wheat
Gram wind module, memory module, photoelectric conversion module, voice decoding module, horn module.
Preferably, the MCU controller, effect are the workflows of the entire voice collecting of control and play system.
The MCU controller is bi-directionally connected with the voice decoding module, the MCU controller and the key module
Connection, the MCU controller are connect with the LED lamp module, and the MCU controller and the memory module are two-way
Connection, the MCU controller are bi-directionally connected with the photoelectric conversion module.
Preferably, the key module, including record button, transmission key；Wherein, record button controls Collecting operation
Personnel's voice messaging sends and sends voice messaging to photoelectric conversion module from memory module by key control.
Preferably, the LED lamp module includes 3 LED lights, when work display color be respectively it is yellow, red,
It is green；Yellow indicates that power work is normal, and blinking red lamp and green light continue bright expression just in typing voice, stored voice message, red
Lamp flashing and green light continue it is bright be transformed into red light and green light and all extinguish expression sent voice messaging, blinking red lamp and green light guarantor
Holding extinguishing indicates receiving, plays voice messaging, and blinking red lamp and green light keep that extinguishing is transformed into red light and green light all extinguishes
Expression has received voice messaging.
Preferably, the microphone module, effect is that the voice signal of operating personnel is converted to electric signal, described
Microphone module connect with the voice decoding module.
Preferably, the memory module, effect is that the electric signal in microphone module is transformed into digital signal to deposit
It is stored in memory module, the memory module is bi-directionally connected with the MCU controller.
Preferably, the photoelectric conversion module, effect are by the digital signal transition of memory module into fiber-optic signal,
The photoelectric conversion module is bi-directionally connected with the MCU controller.
Preferably, the voice decoding module, effect is to be encoded into the collected electric signal of microphone module
Digital signal or by the digital signal decoding in memory module at electrical signal information.The voice decoding module with it is described
Horn module connection, the voice decoding module connect with the microphone module, the voice solution coding mould
Block is bi-directionally connected with the MCU controller.
Preferably, the horn module, effect is that the electric signal for being decoded into voice decoding module is transformed into sound
Sound signal, the horn module are connect with the voice decoding module.
Preferably, the working method are as follows: (1) when working face carries out CT transmissive operation, first by host and slave
Measuring point is preset in the two sides for being respectively placed in working face to be measured, and fixes respectively with transmitting radar antenna and radar receiving antenna；(2) it opens
After machine, the transmission work of radar trigger signal starts, the automatic long range real-time Transmission for realizing trigger signal；(3) it detected
Cheng Zhong such as needs to carry out the voice communication of operating personnel, then host service function personnel initiate the working method of communication are as follows: host service function
Personnel are needed the information transmitted by record button typing, at this time the blinking red lamp of host, and green light continues bright, voice messaging record
After the completion of entering, host red light and street lamp extinguish, by sending key, after voice messaging is transferred to slave by optical fiber, slave it is red
Lamp flashing, and green light does not work, and the loudspeaker of slave play the voice messaging of host transmission automatically, and slave reception staff hears voice
Relevant work is carried out after information；(4) slave operator initiates communication, and working method is identical as operating process in (3).
The present invention achieves following technical effect compared with the existing technology: the present invention provides a kind of mining CT to transmit geology
The communication device and its working method of radar.A kind of communication device of mining CT transmission geological radar includes: radar triggering letter
Number generator, radar trigger signal receiver, voice collecting and play system, optical fiber, fibre optic repeater, power supply.It is mainly made
There are two: first is that the real-time Transmission of mining CT transmission geological radar trigger signal, second is that the voice real-time communication of operating personnel.
This communication device and its working method, when solving large span working face CT detection under Mine Complicated environment, geological radar triggering
The long range real-time Transmission of signal and the real-time communication problem of operating personnel simplify the structure of CT transmission geological radar.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without any creative labor, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the communication device external structure schematic diagram that the mining CT of the present invention transmits geological radar；
Fig. 2 is the system control principle schematic diagram inside the communication device of the mining CT transmission geological radar of the present invention；
Wherein, 1,2 be JTAG software download debugging interface, 3,6, be optical fiber, 4,5,7,8,10,12 be optical fiber interface, 9 are
Radar trigger signal generator, 11 be radar trigger signal receiver, 13,14 be yellow power LED lamp, 15,16 be power supply, 17
It is record button for fibre optic repeater, 18,26,19,23 red LED lamps, 20,24 be green LED lamp, and 21,27 be microphone,
22,28 is send key, and 25,29 be loudspeaker.
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.
The object of the present invention is to provide the communication devices and its working method of a kind of mining CT transmission geological radar, to solve
When large span working face CT is detected under Mine Complicated environment, the long range real-time Transmission of geological radar trigger signal and operation people
The real-time communication problem of member simplifies the structure of CT transmission geological radar.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
Fig. 1 to Fig. 2 is please referred to, Fig. 1 is the communication device external structure schematic diagram that the mining CT of the present invention transmits geological radar,
Fig. 2 is the system control principle schematic diagram inside the communication device of CT of the present invention transmission geological radar.
The present invention provides the communication device and its working method of a kind of mining CT transmission geological radar, including host, slave,
Fibre optic repeater, optical fiber.There are two optical fiber interface, software download debugging interface, loudspeaker, microphone, records for setting on host housing
Tone keys send key, battery case, a yellow led power supply indicator, a red LED signal indicator light and a green
LED signal indicator light.There are two optical fiber interface, software download debugging interface, loudspeaker, microphone, recording for setting on slave shell
Key sends key, power button, battery case, a yellow led power supply indicator, a red LED signal indicator light and one
A green LED signal lamp.
The present invention provides the communication device and its working method of a kind of mining CT transmission geological radar, the communication device
Specific embodiment is as follows:
(1) communication software is downloaded in slave by JTAG software download debugging interface 1,2.
(2) all parts of slave are connected, steps are as follows: the plug and host optical fiber of optical fiber 3 is connect
Mouth 4 is connected, another plug of optical fiber 3 is connected with fibre optic repeater optical fiber interface 5.A plug and slave for optical fiber 6
Optical fiber interface 7 is connected, another plug of optical fiber 6 is connected with fibre optic repeater optical fiber interface 8.Radar trigger signal occurs
The optical fiber interface 10 of device 9 is connected by optical fiber with the transmitting unit of transmitting antenna, the optical fiber of radar trigger signal receiver 11
Interface 12 is connected by optical fiber with the acquisition unit of receiving antenna, after communication device successful connection, yellow power indication LED
13,14 is bright simultaneously, indicates that the power supply of power supply 15,16 is normal.
(3) transmitting antenna, the host computer communication of CT transmission geological radar are placed in the side of working face, CT is transmitted into geology thunder
The receiving antenna that reaches, communication slave are placed in the other side of working face, transmit operation if it is large span working face is carried out, host and
Multiple fibre optic repeaters 17 can be increased between slave, to guarantee remote transmission demand.
(4) host service function personnel press record button 18, and at this moment red LED lamp 19 flashes, and green LED lamp 20 is lasting bright,
The voice messaging transmitted is needed by 21 typing of microphone, when voice input finishes, is pressed and is sent key 22, it is red
LED light 19 and green LED lamp 20 are extinguished simultaneously, and when slave receives voice messaging, the red LED lamp 23 of slave flashes, green
Color LED light 24 keeps OFF state, and loudspeaker 25 play voice messaging.
After slave operator receives voice messaging, corresponding operation is completed according to the instruction of host service function personnel, operation is complete
Cheng Hou, slave operator press record button 26, and red LED lamp 23 flashes, and green LED lamp 24 is lasting bright, pass through microphone 27
Typing needs the voice messaging transmitted.When voice input finishes, presses and send key 28, red LED lamp 23 and green
LED light 24 is extinguished simultaneously, and when host receives voice messaging, the red LED lamp 19 of host flashes, and green LED lamp 20 is kept
OFF state, loudspeaker 29 play voice messaging, and host service function personnel complete corresponding operation after receiving voice messaging.Radar emission
Antenna operation personnel, radar host computer operator and radar receiving antenna operator carry out speech exchange by principal and subordinate.
By above-mentioned operation, the present invention provides a kind of communication device of mining CT transmission geological radar and its work sides
Method completes the real-time Transmission of mining CT transmission geological radar trigger signal and the voice real time transport of operating personnel, to solve
When having determined that large span working face CT is detected under Mine Complicated environment, the long range real-time Transmission of geological radar trigger signal and operation
The voice real time transport problem of personnel simplifies the structure of CT transmission geological radar.
Specific examples are applied in the present invention, and principle and implementation of the present invention are described, above embodiments
Illustrate to be merely used to help understand method and its core concept of the invention；At the same time, for those skilled in the art, according to
According to thought of the invention, there will be changes in the specific implementation manner and application range.In conclusion the content of the present specification
It should not be construed as limiting the invention.
Claims (14)
1. a kind of communication device and its working method of mining CT transmission geological radar, it is characterised in that: a kind of mining CT is saturating
The communication device for penetrating geological radar includes: radar trigger signal generator, radar trigger signal receiver, voice collecting and broadcasting
System, optical fiber, fibre optic repeater, power supply.
2. the communication device and its working method of mining CT transmission geological radar according to claim 1, it is characterised in that:
The communication device and its working method, main purpose are to solve large span working face CT under Mine Complicated environment to detect
When, the long range real-time Transmission of geological radar trigger signal and the real-time communication problem of operating personnel, while simplifying CT transmission ground
The structure of matter radar.
3. the communication device and its working method of mining CT transmission geological radar according to claim 1, it is characterised in that:
The radar trigger signal generator, the signal generated are pulse signal；Radar trigger signal generator there are two interface,
One connect with transmitting unit, launches outward electromagnetic wave for triggering transmitting unit, another connect with optical fiber, transmission pulse letter
Number give radar trigger signal receiver.
4. the communication device and its working method of mining CT transmission geological radar according to claim 1, it is characterised in that:
The radar trigger signal receiver, there are two interfaces, and one connect with optical fiber, receive the pulse transmitted from optical fiber
Signal；Another connect with acquisition unit, is used to triggering collection unit and acquires reflection electromagnetic wave.
5. the communication device and its working method of mining CT transmission geological radar according to claim 1, it is characterised in that:
The voice collecting and play system, comprising: MCU controller, key module, LED lamp module, microphone module store mould
Block, photoelectric conversion module, voice decoding module, horn module.
6. the communication device and its working method of mining CT transmission geological radar according to claim 5, it is characterised in that:
The MCU controller, effect are the workflows of the entire voice collecting of control and play system.The MCU controller
It is bi-directionally connected with the voice decoding module, the MCU controller is connect with the key module, the MCU
Controller is connect with the LED lamp module, and the MCU controller is bi-directionally connected with the memory module, the MCU
Controller is bi-directionally connected with the photoelectric conversion module.
7. the communication device and its working method of mining CT transmission geological radar according to claim 5, it is characterised in that:
The key module, including record button, transmission key；Wherein, record button controls Collecting operation personnel voice messaging, hair
It send and sends voice messaging to photoelectric conversion module from memory module by key control.
8. the communication device and its working method of mining CT transmission geological radar according to claim 5, it is characterised in that:
The LED lamp module includes 3 LED lights, and display color is respectively yellow, red, green when work；Yellow indicates power supply work
Make normal, blinking red lamp and green light continue bright expression just in typing voice, stored voice message, and blinking red lamp and green light continue bright
It is transformed into red light and green light and all extinguishes expression and sent voice messaging, blinking red lamp and green light keeps extinguishing and indicate connecing
It receives, play voice messaging, blinking red lamp and green light holding extinguishing, which are transformed into red light and green light, which all extinguishes, indicates to have received language
Message breath.
9. the communication device and its working method of mining CT transmission geological radar according to claim 5, it is characterised in that:
The microphone module, effect is that the voice signal of operating personnel is converted to electric signal.The microphone module with
The voice decoding module connection.
10. the communication device and its working method of mining CT transmission geological radar according to claim 5, feature exist
In: the memory module, effect is that the electric signal in microphone module is transformed into digital signal to be stored in memory module
In.The memory module is bi-directionally connected with the MCU controller.
11. the communication device and its working method of mining CT transmission geological radar according to claim 5, feature exist
In: the photoelectric conversion module, effect is the digital signal transition by memory module into fiber-optic signal.The photoelectricity turns
Mold changing block is bi-directionally connected with the MCU controller.
12. the communication device and its working method of mining CT transmission geological radar according to claim 5, feature exist
In the voice decoding module, effect be the collected electric signal of microphone module is encoded into digital signal or
By the digital signal decoding in memory module at electric signal.The voice decoding module is connect with the horn module,
The voice decoding module is connect with the microphone module, and the voice decoding module and the MCU are controlled
Device processed is bi-directionally connected.
13. the communication device and its working method of mining CT transmission geological radar according to claim 5, feature exist
In: the horn module, effect is that the electric signal for being decoded into voice decoding module is transformed into voice signal.Described
Horn module is connect with the voice decoding module.
14. the communication device and its working method of mining CT transmission geological radar according to claim 1, feature exist
In: the working method are as follows: (1) when working face carries out CT transmissive operation, be first respectively placed in host and slave to be measured
Measuring point is preset in the two sides of working face, and fixes respectively with transmitting radar antenna and radar receiving antenna；(2) after being switched on, radar touching
The transmission work of signalling starts, the automatic long range real-time Transmission for realizing trigger signal；(3) it in detection process, such as needs
The voice communication of operating personnel is carried out, then host service function personnel initiate the working method of communication are as follows: host service function personnel are by recording
Key typing needs the information transmitted, at this time the blinking red lamp of host, and green light is lasting bright, after the completion of voice messaging typing,
Host red light and street lamp extinguish, by transmission key, after voice messaging is transferred to slave by optical fiber, and the blinking red lamp of slave, and
And green light does not work, the loudspeaker of slave play the voice messaging of host transmission automatically, and slave reception staff hears that voice messaging is laggard
Row relevant work；(4) slave operator initiates communication, and working method is identical as operating process in (3).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811424738.5A CN109217896B (en) | 2018-11-27 | 2018-11-27 | A kind of communication device and its working method of mining CT transmission geological radar |
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| CN201260219Y (en) * | 2008-08-14 | 2009-06-17 | 深圳市赛邦特通信科技有限公司 | Optical fiber intercom device |
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| CN205792556U (en) * | 2016-07-13 | 2016-12-07 | 山东微感光电子有限公司 | A kind of mine optical fiber digital telephone and emergency communication system |
| CN106788558A (en) * | 2016-11-22 | 2017-05-31 | 北京信息科技大学 | A kind of ground through communication system |
| CN207638646U (en) * | 2017-12-14 | 2018-07-20 | 肥城弘锦电气机械科技有限公司 | A kind of mining intercom |
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2018
- 2018-11-27 CN CN201811424738.5A patent/CN109217896B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201260219Y (en) * | 2008-08-14 | 2009-06-17 | 深圳市赛邦特通信科技有限公司 | Optical fiber intercom device |
| CN102662195A (en) * | 2012-05-18 | 2012-09-12 | 北京国电经纬工程技术有限公司 | Underground cavity detection system |
| CN205792556U (en) * | 2016-07-13 | 2016-12-07 | 山东微感光电子有限公司 | A kind of mine optical fiber digital telephone and emergency communication system |
| CN106788558A (en) * | 2016-11-22 | 2017-05-31 | 北京信息科技大学 | A kind of ground through communication system |
| CN207638646U (en) * | 2017-12-14 | 2018-07-20 | 肥城弘锦电气机械科技有限公司 | A kind of mining intercom |
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| CN109217896B (en) | 2019-09-13 |
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