CN202443741U - Intrinsically safe network voice controller for mine - Google Patents
Intrinsically safe network voice controller for mine Download PDFInfo
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- CN202443741U CN202443741U CN2012200808804U CN201220080880U CN202443741U CN 202443741 U CN202443741 U CN 202443741U CN 2012200808804 U CN2012200808804 U CN 2012200808804U CN 201220080880 U CN201220080880 U CN 201220080880U CN 202443741 U CN202443741 U CN 202443741U
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Abstract
The utility model discloses an intrinsically safe network voice controller for a mine. The intrinsically safe network voice controller for the mine comprises a central processing unit (CPU) circuit, wherein the CPU circuit is respectively connected with a network processing circuit, a secure digital memory (SD) card circuit, two paths of audio coding and decoding circuits, an audio driving circuit and a power supply circuit used for supplying electric power, the two paths of audio coding and decoding circuits are connected with at least one path of audio interface through the audio driving circuit, and the SD card circuit is directly connected with the audio coding and decoding circuit. The intrinsically safe network voice controller for the mine belongs to a part of underground digital broadcasting for the mine, the digital broadcasting adopts the network transmission, the signal-to-noise ratio is high, the transmission distance is long, and the advantages which are incomparable with those of the traditional constant pressure broadcasting are realized. The intrinsically safe network voice controller is applicable to places such as underground traveling roads for the mine, parking lots and rest rooms.
Description
Technical field
The utility model relates to a kind of mine intrinsic safety type voice-over-net controller.
Background technology
Traditional broadcasting at present can not be satisfied the needs of broadcasting under the coal mine.Traditional 1. level pressure transmission receives factor affecting such as linear transformer bandwidth, loudspeaker size, cable footpath, and frequency range is at 200HZ-12KHZ, and degree of distortion is big, can't realize stereo transmission; 2. the program capacity is little, can not addressing control, and a line can only transmit a programs, can't satisfy broadcasting and sectorization broadcast simultaneously, can't realize point-to-point addressable broadcast.3. source of sound all is to adopt the simulation source of sound basically, can't play the digital format audio file, can't realize automatic broadcast, automatically control.Rated power broadcast all is that the principle according to power match and impedance matching designs, and finishes in case system wiring is installed, and the capacity that power expands is very limited, and the program capacity also can't expand.
Summary of the invention
The purpose of the utility model is for overcoming the deficiency of above-mentioned prior art, a kind of mine intrinsic safety type voice-over-net controller being provided.
For realizing above-mentioned purpose, the utility model adopts following technical proposals:
It comprises cpu circuit; Cpu circuit links to each other with network processing circuitry, SD card circuit, two-way audio coding-decoding circuit, audio drive circuitry and the power circuit that is used to supply power respectively; The two-way audio coding-decoding circuit links to each other with at least one road COBBAIF through said audio drive circuitry, and said SD card circuit directly links to each other with the audio coding decoding circuit.
In order to improve the audio driven ability, audio drive circuitry links to each other with at least one road COBBAIF.
Said SD card circuit directly links to each other through the SPI interface with the audio coding decoding circuit.SD card circuit is connected with coding-decoding circuit can realize that the audio file stream of exporting on the SD card directly gets into coding-decoding circuit without cpu circuit; Can reduce consumption like this to the CPU internal memory; Make CPU can handle more thing simultaneously; Also guaranteed simultaneously the continuity of music, encoding and decoding time and real music reproduction time mate more.Avoided, owing to CPU is handling the phenomenon that the music that produces when its task or accident consume a large amount of internal memory " gets stuck ".
Said audio drive circuitry also links to each other with cpu circuit, and CPU can pass through control Driver Circuit, the switching of control audio input/output signal and cut-offfing.Audio drive circuitry links to each other with cpu circuit, and an effect is with CPU initialization audio drive circuitry.Another effect is the controllability that strengthens audio drive circuitry.Comprised the audio signal circuit that will play of giving audio amplifier and the MIC voice signal circuit that transmits by audio amplifier in the audio drive circuitry, linked to each other with CPU and can realize issuing audio frequency and functions such as the free switching of uploading audio frequency, switch, passback.
Said COBBAIF is 4 the tunnel.
Said power circuit also links to each other with the cascade device power interface.
Power circuit is that interlock circuit provides stabilized voltage supply, through encoding and decoding of cpu circuit control audio and audio drive circuitry, the audio data on network or the SD card is issued and broadcasts out etc. through audio amplifier.
Mining voice-over-net controller is to be the automatically-monitored equipment of core with codec chip and microprocessor.Have the network transmitting-receiving, the audio file codec functions is being stored mp3 file.Can accept the audio digital signals that host computer transmits, and be decoded into simulating signal and send to audio amplifier.It is the intelligent information terminal of audio amplifier and ground central station.This is mining, and the voice-over-net controller is the carrying and the transferring equipment of input, output source of sound, can off line use separately, also can be used with host computer with management.
The mine intrinsic safety type voice-over-net controller of the utility model is the important component part of broadcaster under the coal mine, is applicable to places such as mine traveling road, parking lot, rest room, coal face.Receive the order and the data of propagandaing directed to communicate that the server software of host computer transmits through network, carry out corresponding operating.Sound signal is transferred to mine intrinsic safety type broadcaster audio amplifier through demoder, propagandas directed to communicate etc. for the underground labour provides music, security knowledge education, emergency notice broadcasting, down-hole.Can also receive the MIC signal that mine intrinsic safety type audio amplifier transmits, this analog voice signal playback and the digital signal that converts ADPCM coding to are uploaded to host computer.
This voice-over-net controller mainboard is hardware foundation with STM32F103.STM32F103 is the ARM microprocessor of advanced cotexM3 kernel, and this family chip is powerful, good stability, antijamming capability is strong, temperature range is wide, and is low in energy consumption, is that the ideal of down-hole application is selected.
The built-in system software of mining voice-over-net controller adopts the very strong embedded OS usocII of real-time, and in program, has transplanted FatFs file system and TCP/UDP IP stack.
One of critical function of this is mining voice-over-net controller is the audio codec on the control mine intrinsic safety type audio amplifier; SD card sound intermediate frequency file is carried out Code And Decode; The order that simultaneously host computer was passed is resolved; Divide and to manage out command word and data, the voice data that transmits is decoded and play.After the signal that detects down-hole sound equipment MIC triggering; Stop in progress audio file; And switch to playback function with the voice reproducing in the MIC to other sound equipments; And this audio coding become adpcm code, to host computer send out teletype command and will encode after audio file pack and upload to host computer.Under normal circumstances whether " heartbeat " bag of back host computer transmission detection voice-over-net controller is online at set intervals; Owing to a plurality of controllers are arranged in the system, be mounted on the network simultaneously with the form of different IP, so; Each heartbeat packet can recovery itself the IP address, information such as MAC.Processing for audio file comprises the scanning to audio file on the SD card.Apply for that according to the number of the inside file the space deposits the audio file playlist during scanning.
Host computer also can will issue audio file to the SD card through this mining voice-over-net controller; Be that host computer is with the audio file subpackage; Go out to give this controller by frame with data, controller can be set up relevant audio file according to the filename that host computer will transmit in the SD card.And become audio file according to the data integration that receives, it is saved in the SD card.Can rescan listed files afterwards, add the file that increases newly to playlist.
Realized the encoding and decoding speech of full duplex through software with the semiduplex audio coder & decoder (codec) of two-way; The audio drive circuitry driving force is strong, and universal performance is good, can connect the general any simulation audio amplifier in market; Realize control, transmission through network to voice, easy to use; The SD card is in the same place with the audio decoder circuit design, only can realize exchanges data with CPU control command, clock and chip selection signal, has saved the resource of CPU greatly; There are 4 road power outlets can realize the power supply of the cascade of next stage equipment on the circuit, avoided the difficulty of external power supply wiring, adopt dual power supply line, the common mode that inserts of double earth wire to reduce circuit merit consumption simultaneously; Have two light, three electric switches, can realize the interconnected of network; Voicefrequency circuit fidelity performance is good, is the best a product of acoustics in the present mining audio frequency apparatus, and adopts unique design, makes tone frequency channel wire, MIC line not have polarity, prevents that the reversal connection of construction midline road from bringing unnecessary trouble; And audio frequency is divided into 4 the tunnel, can insert different directions respectively.
This is mining, and the voice-over-net controller is also supported the power down protection to important parameter.IP, the MAC that comprises IP, MAC and the server of equipment also has the initialized IP, MAC of Default Value in order to when breaking down, carrying out factory reset, just can redistribute relevant IP, MAC etc. then and make its normal use.When replying " heartbeat " bag of host computer, return with oneself the IP information of usefulness return host computer.This is mining voice-over-net controller can online modification itself IP, MAC Address, can also revise IP, the MAC Address of the server of preservation.Simultaneously can accept the IP broadcast search signal that host computer is sent out, return information such as self IP, MAC.The convenient IP information that when network is chaotic, finds controller.But also can online adjusting volume, and the volume after will regulating be preserved.So that volume changes behind the power-down rebooting.
The voice-over-net controller can detect during decoding whether the special operational request is arranged therebetween at the decoded audio file, if there is not particular request.The voice-over-net controller can be according to the audio file played in order in the playlist, if tabulation finishes playing, after from the beginning play again, so move in circles, up to receiving the special operational request.These special operationals comprise that host computer is to audio-frequency informations such as the radio talk of voice-over-net controller, broadcast safe knowledge lectures; This moment, controller can suspend the broadcast of audio file; Audio file transmissions up to host computer finishes; Continue to wait for several seconds and see if there is continuous audio frequency,, then can continue to play transmission audio file before if do not have.Also have, when the MIC request signal triggered, controller also can suspend the audio file of playing, and is transformed into coding mode, to the coding audio signal that is transmitted by audio amplifier, was encoded into the PCM sign indicating number, was sent to host computer.After the signal of wait MIC audio frequency stops, waiting for a few times in second, if also there is not new signal triggering, this can switch to play mode, the audio frequency before continuing to play.Also have, when host computer issues the preservation audio file, also can carry out same operation.Suspend in progress audio file earlier, the file that will preserve according to instruction then is saved in corresponding position.Continue to play the original audio file that suspends again after waiting for the preservation end of file again.
Above said audio file comprise MP3 format, the MIDI audio format, the audio file that WAV form and WMA form etc. are commonly used is because hardware space is limited, so in requiring, mainly be defined as MP3 format.Operation to audio file in the controller mainly is under the basis of FAT file system, to carry out.Comprise the operation such as broadcast, preservation of the searching of file, file ordering, file.For coding, employing be IMA ADPCM monophony coded format.Usefulness be the mode of line input.Two codecs are arranged on the voice-over-net controller; The work of taking on Code And Decode respectively, because the own synchronization of chip that uses can only be worked in one mode, promptly same chip Code And Decode can not be worked simultaneously; So be designed to two chips herein; And under the operating system scheduling of program design and ucosii, Code And Decode is worked simultaneously, can accomplish the full duplex function of voice call.And the voice signal that a plurality of audio amplifiers transmit under the ore deposit can be merged into one tunnel sound signal and upload to host computer through a controller, promptly can realize point-to-points and many two-way intelligent communications to point.And what adopt during the signal that the reception audio amplifier transmits is the simulating signal trigger circuit, promptly triggers controller with the sound signal of uploading self, it is produced interrupt, so can realize quick response.Be provided with response threshold simultaneously, prevent the errored response that noise signal that circuit transmits causes, arrive safety, stable, the purpose of response fast.
Compared with prior art; The beneficial effect of the utility model is; The mining broadcaster of having used this mining network controller is the broadcaster of new generation of the current forward position of the fusion computing machine that aims at colliery exploitation, multimedia, communication, real time operating system, embedded, singlechip technology, has that traditional rated power broadcast does not possess, incomparable characteristics:
1. multiplex broadcasting function: device can realize that MCVF multichannel voice frequency transmits simultaneously, can support 8 physical links.
2. the source of sound kind is abundant: the source of sound kind is abundant, can use traditional audio amplifier equipment such as microphone, microphone, DVD/VCD, also can computer, modern digital equipment such as MP3.When using computer to play, can play whole digital voice files that computer is supported, but network enabled is play in addition, the ore deposit leader can pass through computer to the down-hole radio talk in this office.
3. but sectoring function: but automatic or manual is accomplished independent control by zone or logic groups broadcasting, subregion broadcasting (like Office Area, down-hole waiting room, dining room), as separately notice being play in the Office Area; Also can carry out the broadcasting of full ore deposit.
4. remote control function: can carry out the control of broadcaster main frame start-stop through computing machine, friendly interface, easy to operate, really realized being addressed to point control.
5. routine safety propaganda, education: play mine safety rules and regulations, safety practice, corporate culture and other points for attention etc., strengthen worker's awareness of safety.
6. combination emergency preplan, carry out automatic or manual emergency management and rescue: when device detects the safety monitoring device alarm, when serious accident appears in the down-hole, can transfer relevant emergency preplan according to prior setting program, the commander field staff withdraws; Also can manual work call the emergency preplan voice, play to the appointed area; Can also pass through microphone, directly the commander relevant personnel withdraw.(this function needs additional customized, installs spare interface.）
7. switching value input: support the input of 4 way switch amount information on the hardware, cooperate on-the-spot other equipment of mining industry, carry out the phonic warning prompting, avoid the generation of accident.Can be provided with as required and start near the audio amplifier of alarm points or whole audio amplifier.
8. transmission range is long: can adopt full optical cable mode to transmit, shock resistance, noiseless, high-fidelity, transmission range can reach 60 kilometers, are particularly suitable for rugged surroundings under the coal mine.
9. automatic playing function: management is with the double simultaneously digital program source of doing of host computer, through device host computer management software can realize manually, the self-timing broadcast, the colliery can be with voice documents commonly used such as safety education, safety rules; Be stored on the hard disk, realize full-automatic non-linear broadcast, need not manual intervention; Can play automatically; Realized real unmanned, can make different broadcast schemes, realized real-time loop play according to the cycle.
10. high-quality voice: the speech chip design of specialty, unique machinery, technological design accomplish that sound is loud and clear, and be undistorted, changed the root problem of hands free telephone lower tone under the past coal mine.
11. music tone ringer, background music function: song, music and safety education slogan, poster, melodious music replaces the ear-piercing electric bell sound up to 90 decibels; The background music automatic or manual is played to the appointed area, makes miner's interference that no longer bears noise.
12. legacy equipment intelligent management: intelligent and safe broadcasting main control system is connected with computer, accepts the computer control command, in the software unified management automatic switch of control multiple devices down is set, and timing automatic is play.The colliery can be added intelligent and safe broadcasting main control system (or adding smooth upgrade later on) as required, realizes computing machine to VCD, CD, the intelligent management of sources of sound such as DVD.
13. good opening and extensibility: have good opening and extensibility, can form wire, tree network, signal outlet is set up in the parallel port, adds audio amplifier arbitrarily according to concrete demand.
14. advantages of higher stability and reliability: adopt RF weak signal transmission mode; Improved the reliability of device greatly; Inactivity signal in the device transmission network, the fault of single audio amplifier does not influence device work, and complete machine is not having to be in closed condition under the situation of signal automatically; Audio amplifier starts automatically after having treated enabling signal or having received start-up command, need not personnel's control.
15. two-way intercommunication function: can realize down-hole intercommunication earthward.
16. digital video interlock: can combine with digital video apparatus, reach data, voice, video interlink.
17. output audio is the simulated audio signal of standard, can take over the general stereo set of meaning.
The part that the mining voice-over-net controller that the utility model relates to is digital broadcasting under the coal mine, Network Transmission is adopted in digital broadcasting, and signal to noise ratio (S/N ratio) is high, and long transmission distance has the incomparable advantage of traditional rated power broadcast.
The utility model has been heightened the security of borehole operation, the information that makes can in time be passed on, ensure to greatest extent the circulation of personal safety and the information thereof of underground operators when accident and at ordinary times important information can notify everyone timely and effectively.
Description of drawings
Fig. 1 is the utility model structural representation;
Fig. 2 is the module diagram in the controller case;
Fig. 3 is the circuit diagram of network processing circuitry;
Fig. 4 is the circuit diagram of SD card circuit;
Fig. 5 is the circuit diagram of power circuit;
Fig. 6 is the circuit diagram of coding-decoding circuit;
Fig. 7 is the circuit diagram of cpu circuit;
Fig. 8 is that cascade device connects synoptic diagram.
Wherein, 1.CPU circuit; 2. network processing circuitry; 3.SD card circuit; 4. coding-decoding circuit I, 5. coding-decoding circuit II, 6. audio drive circuitry, 7. power circuit, 8. COBBAIF; 9. cascade device power interface, 10 photoelectricity switches, 11. optical fiber, 12. power transfer module, 13. fiber reels; 14. 1 road 24V input, 15. 1 road 24V output, 16.2 road 24V input, 17. 2 road 24V output; 18.3.3V input, 19.3.3V output, 20. mine intrinsic safety type voice-over-net controllers, D1. mining explosion-proof type 24V direct supply; Z1. voice-over-net controller main frame 1, Z2. voice-over-net controller main frame 2, Z3. voice-over-net controller main frame 3, Z4. voice-over-net controller main frame 4.
Embodiment
Through instantiation the utility model is further set forth below, should be noted that following explanation only is in order to explain the utility model, its content not to be limited.
Referring to the structural representation of Fig. 1 and the control box inner module synoptic diagram of Fig. 2, a kind of mine intrinsic safety type voice-over-net controller is by power circuit 7; Network processing circuitry 2, SD card circuit 3, cpu circuit 1; Coding-decoding circuit I 4, coding-decoding circuit II 5, audio drive circuitry 6; 4 road COBBAIFs 8, cascade device power interface 9 compositions such as grade.Fig. 3 is the circuit diagram of network processing circuitry; Fig. 4 is the circuit diagram of SD card circuit; Fig. 5 is the circuit diagram of power circuit; Fig. 6 is the circuit diagram of coding-decoding circuit; Fig. 7 is the circuit diagram of cpu circuit.
Said SD card circuit 3 II 5 that also links to each other with the audio coding decoding circuit.SD card circuit 3 is connected with coding-decoding circuit II 5 can realize that the audio file stream of exporting on the SD card directly gets into coding-decoding circuit without CPU; Can reduce consumption like this to the CPU internal memory; Make CPU can handle more thing simultaneously; Also guaranteed simultaneously the continuity of music, encoding and decoding time and real music reproduction time mate more.Avoided, owing to CPU is handling the phenomenon that the music that produces when its task or accident consume a large amount of internal memory " gets stuck ".
Said audio drive circuitry 6 also links to each other with cpu circuit 1.Audio drive circuitry 6 links to each other with cpu circuit 1, and an effect is with CPU initialization audio drive circuitry 6.Another effect is the controllability that strengthens audio drive circuitry 6.Comprised the audio signal circuit that will play of giving audio amplifier and the MIC voice signal circuit that transmits by audio amplifier in the audio drive circuitry 6, linked to each other with cpu circuit 1 and can realize issuing audio frequency and functions such as the free switching of uploading audio frequency, switch, passback.
Said power circuit 7 also links to each other with cascade device power interface 9.
Cascade device is as shown in Figure 8; (example shown in Figure 8 explains that just main frame links to each other with main frame; Being connected with this of sound equipment and main frame is original) D1: mining explosion-proof type 24V direct supply, Z1: voice-over-net controller main frame 1, Z2: voice-over-net controller main frame 2; Z3: voice-over-net controller main frame 3, Z4: voice-over-net controller main frame 4.
The power interface of mining power supply D1 and main frame Z1 links to each other; The power input interface of Z2 links to each other with the power output interface of Z1; Z2's can power taking on Z1 in other words; So just avoided D1 to link to each other with Z2 in (dotted line among the figure), same Z3, Z4 can pass through the previous stage power taking, such as solid line in scheming company.And can directly as dotted line among the figure not be connected with power supply.
The electricity of getting through upper level all has the holding circuit of the reversal connection of preventing in main frame, avoid reversal connection occurring in the construction and cause system to go wrong.
Because the mine lower room is narrow and small; Power cable all compares slightly, and the distance between the main frame is generally far away, is to cause very difficulty of wiring if All hosts all links to each other with D1 one; The total length of another cable also is being doubled at double; Thing followed price also is being doubled at double, promptly is unfavorable for site operation, also is unfavorable for enterprise profit.If adopt the mode of terminal box, add a terminal box in the Z1 front line is separated, a route inserts another road of Z1 let Z1 receive Z2; Be unfavorable for field wiring so on the one hand; Increased product and construction cost on the one hand, another All hosts is all parallelly connected with the power supply of D1, if there is a host line to go wrong; To cause All hosts not worked, and also be difficult to confirm the problem that of which main frame under the main frame situation how.Unlike the cascade system among the design; As long as the power supply that has the input power supply of a main frame to break off the main frame of back all breaks off; Under the colliery, find problem fast and in time take effective construction like this, will bring immeasurable advantage the safety in miner and whole colliery in the face of the higher field of safety requirements.
Voice-over-net controller CPU circuit 1 can be according to the audio file played in order of playlist in the SD card, and at first through the coding-decoding circuit decoding, signal arrives mining broadcasting audio amplifier through audio drive circuitry 6 again and plays.If tabulation finishes playing, after from the beginning play again, so move in circles, up to receiving the special operational request.For example host computer is to the radio talk of voice-over-net controller; This moment, controller can suspend the broadcast of audio file, finished up to the audio file transmissions of host computer, continued to wait for several seconds and saw if there is continuous audio frequency; If no, then can continue to play transmission audio file before.Also have, when the MIC signal passed through one of 4 road COBBAIFs 8 request trigger, controller also can suspend the audio file of playing; Be transformed into coding mode; The sound signal that audio amplifier transmits arrives codec through audio drive circuitry 6, is encoded into adpcm code, is sent to host computer.After the signal of wait MIC audio frequency stops, waiting for a few times in second, if also there is not new signal triggering, this can switch to play mode, the audio frequency before continuing to play in the SD card.
For coding, employing be IMA ADPCM monophony coded format, usefulness be the mode of line input.On this is mining voice-over-net controller two codecs are arranged; The work of taking on Code And Decode respectively, because the own synchronization of chip that uses can only be worked in one mode, promptly same chip Code And Decode can not be worked simultaneously; So be designed to two chips herein; And under the operating system scheduling of program design and ucosii, Code And Decode is worked simultaneously, can accomplish the full duplex function of voice call.
The voice coding of this design and the independently processing of circuit of decoding respectively; The load of total system is reduced greatly; And the speed of encoding and decoding is significantly improved; Particularly can effectively overcome in the actual environment strong magnetic interference and the negative effect that the chip self-heating brings encoding-decoding efficiency, can bring traditional circuit to design incomparable effect in practical application.
The design of the power circuit of this equipment all meets the intrinsic safety requirement.Be not allow big electric capacity and inductance appearance in the environment of the many gas in colliery; And traditional voicefrequency circuit adopts big capacitor filtering to reach the effect that reduces power supply ripple through regular meeting; In being designed for can satisfy this case requirement can reach again good quality audio purpose; The special high DCDC chip of switching frequency that uses of power supply so just just can be used smaller lc circuit at the back herein, and it is just short that the big electric capacity of switching frequency is fully put the time; The time of inductance accumulation of energy does not so just need big accumulation of energy original paper just can satisfy the requirement of power supply with regard to shorter yet., the filtering of row's shape is adopted in the back, and multiple mode realizes reducing the purpose that ripple improves tonequality in late-class circuit, to adopt that the mimic channel digital circuit is separated etc.The circuit design ripple that draws this equipment through power supply and the audio-frequency test of specialty is very little, music effect is very good, has well solved the problem that explosive zone under the colliery can not be placed on hi-fidelity audio equipment.
Claims (6)
1. mine intrinsic safety type voice-over-net controller; It is characterized in that; It comprises cpu circuit; Cpu circuit links to each other with network processing circuitry, SD card circuit, two-way audio coding-decoding circuit, audio drive circuitry and the power circuit that is used to supply power respectively, and the two-way audio coding-decoding circuit links to each other with at least one road COBBAIF through said audio drive circuitry, and said SD card circuit directly links to each other with the audio coding decoding circuit.
2. mine intrinsic safety type voice-over-net controller according to claim 1 is characterized in that said COBBAIF is 4 the tunnel.
3. mine intrinsic safety type voice-over-net controller according to claim 1 is characterized in that said power circuit also links to each other with the cascade device power interface.
4. mine intrinsic safety type voice-over-net controller according to claim 1 is characterized in that said SD card circuit directly links to each other through the SPI interface with the audio coding decoding circuit.
5. mine intrinsic safety type voice-over-net controller according to claim 1 is characterized in that, it is hardware foundation that said cpu circuit mainboard adopts STM32F103.
6. mine intrinsic safety type voice-over-net controller according to claim 1 is characterized in that, said two-way audio coding-decoding circuit adopts two-way half-duplex voice codec.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012200808804U CN202443741U (en) | 2012-03-06 | 2012-03-06 | Intrinsically safe network voice controller for mine |
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| CN2012200808804U CN202443741U (en) | 2012-03-06 | 2012-03-06 | Intrinsically safe network voice controller for mine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102592629A (en) * | 2012-03-06 | 2012-07-18 | 济南蓝动激光技术有限公司 | Intrinsically safe network voice controller for mining |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102592629A (en) * | 2012-03-06 | 2012-07-18 | 济南蓝动激光技术有限公司 | Intrinsically safe network voice controller for mining |
| CN102592629B (en) * | 2012-03-06 | 2015-04-08 | 济南蓝动激光技术有限公司 | Intrinsically safe network voice controller for mining |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120919 Termination date: 20150306 |
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| EXPY | Termination of patent right or utility model |