CN103334793B - Underground audio broadcasting alarming device - Google Patents
Underground audio broadcasting alarming device Download PDFInfo
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- CN103334793B CN103334793B CN201310292686.1A CN201310292686A CN103334793B CN 103334793 B CN103334793 B CN 103334793B CN 201310292686 A CN201310292686 A CN 201310292686A CN 103334793 B CN103334793 B CN 103334793B
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- audio
- transmitting antenna
- coupling filter
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- voice frequency
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Abstract
The invention discloses an underground audio broadcasting alarming device. The underground audio broadcasting alarming device comprises a voice frequency amplifier used as a signal emitter, a grounding device and a voice frequency receiving device, the output end of the voice frequency amplifier is connected with the input end of a coupling filter, and the output end of the coupling filter is connected with a transmitting antenna. According to the underground audio broadcasting alarming device, the voice frequency amplifier for voice frequency signals is used for sending alarming signals, the protection wire of an underground power supply system is used as the transmitting antenna, and the influence of grounding current to the voice frequency amplifier when a coupling filter isolation power supply system fails is reduced, the voice frequency receiving device receives voice frequency alarming signals, and underground wireless alarming is achieved. The underground audio broadcasting alarming device has the advantages that voice frequency signal emission is adopted and emission equipment is simple; the protection wire in the underground power supply system is used as the transmitting antenna, on one hand coverage can reach every electrical device, and on the other hand no antenna needs to be arranged. The underground audio broadcasting alarming device is good in performance, high in reliability, simple in structure and low in cost.
Description
Technical field
The present invention relates to a kind of wireless alarmer, particularly relate to one and realize down-hole audio broadcasting warning device.
Background technology
At present, known downhole wireless warning device, shield by rock, the signal transmission distance that the conditions such as tunnel bends cause is short, signal straightline propagation, violent and the antenna size of signal attenuation, impact is set etc., all adopt long wave, medium wave, shortwave, microwave frequency is launched, or employing multiple antennas, the radiation patterns such as leaky cable, these radiation patterns are by geographical position, geological conditions, the impacts such as roadway shape, be difficult to realize launching accurately and reliably or effectively, when mine disaster occurs, personnel in the pit can not be timely, effectively receive alarm signal, and then cause casualties.
The end of the eighties, China has introduced the wireless leaky feeder communication technology for down-hole, this technology, need to launch modulated high-frequency signal with leaky cable, special leaky cable must be laid specially as transmitting antenna in down-hole, and leaky cable constantly must change lay length with the carrying out of digging, investment is large, and the leaky cable material of at substantial and artificial.And due to leaked transmit relate to be high-frequency signal transmission, need special modulating equipment and receiving equipment.
Summary of the invention
In order to solve, prior art wireless alarmer signal transmission distance is short, signal straightline propagation; signal attenuation is violent; multiple transmitting modes is all difficult to realize; and investment is large using leaky cable as transmitting antenna; engineering quantity is large, the high deficiency of cost of production; there is provided a kind of with the protective wire of underground power supply system for transmitting antenna, the down-hole audio broadcasting warning device that transmitter is simple, reliability is high, cost of production is low.
Realize above-mentioned purpose by the following technical solutions:
A kind of down-hole audio broadcasting warning device, comprise the audio frequency enlarger as signal transmitter, ground device, apparatus for receiving audio, the described output of audio frequency enlarger is connected with the input of coupling filter, and the output of coupling filter is connected with transmitting antenna.
Further, audio frequency enlarger arranges two lead-out terminals, a lead-out terminal is connected with the input terminal of coupling filter, another lead-out terminal is connected with the lead-out terminal of coupling filter, another input terminal of coupling filter, lead-out terminal are connected in series in transmitting antenna loop respectively, and ground device connects and composes loop with transmitting antenna respectively.
Further, described transmitting antenna is the protective wire of underground power supply system.
Further, described coupling filter connects and composes resonance circuit by the winding of transformer and Capacitance parallel connection, and resonant frequency is 50Hz.
Further, the audiorange 100Hz-12kHz of described audio frequency enlarger.
Further, described apparatus for receiving audio adopts earphone.
Further, described earphone and audio signal wireless connections.
Adopt technique scheme; compared with prior art; the present invention adopts audio signal audio frequency enlarger to launch alarm signal; utilize protective wire in underground power supply system as transmitting antenna; during coupling filter isolation electric power system fault, earth current is on the impact of audio frequency enlarger; apparatus for receiving audio audio reception alarm signal, realizes the radio alarming of down-hole.Its significant effect is: this device adopts audio signal to launch, and transmitter is simple; Protective wire in employing underground power supply system is as transmitting antenna, and coverage can reach every platform electric fixtures on the one hand, on the other hand without the need to erecting a television antenna.Device performance is excellent, and reliability is high, and structure is simple, and cost is low.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is coupling filter circuit diagram.
In figure, audio frequency enlarger 1, coupling filter 2, ground device 3,6, transmitting antenna 4, apparatus for receiving audio 5.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention will be further described.
The present embodiment is a kind of down-hole audio broadcasting warning device for mine, and by audio frequency enlarger 1, coupling filter 2, ground device 3,6, transmitting antenna 4, apparatus for receiving audio 5 forms.Its structure is shown in Fig. 1, and audio frequency enlarger 1 is that common 100W determines resistive enlarger, and the PA-100U100W level pressure that the present embodiment selects new Shinco Electron Group Co., Ltd to produce hinders enlarger surely, and the audio frequency scope of application of audio frequency enlarger 1 is 100Hz-12kHz.Audio frequency enlarger 1 has two lead-out terminals, and a lead-out terminal is connected with the input terminal a of coupling filter 2, and another lead-out terminal is connected with the lead-out terminal b of coupling filter 2.The effect of audio frequency enlarger 1 is: provide audio signal.
Coupling filter 2 is inventor's designed, designeds, and its structure is shown in Fig. 2, and form resonance circuit by a winding of transformer and Capacitance parallel connection, resonant frequency is 50Hz.Coupling filter 2 has two input terminal a and c, and two lead-out terminal b and d, input terminal c, lead-out terminal d connect and compose loop with transmitting antenna 4 respectively, and input terminal a, lead-out terminal b connect and compose loop with audio frequency enlarger 1 respectively.Transmitting antenna 4 adopts underground power supply system protective wire.
In fig. 2, coupling filter 2 is composed in parallel by the winding of transformer a and electric capacity b and is formed resonance circuit.Consider that Transformer Winding has resistance, reality is R-L C resonance in parallel.Optimum configurations is inductance H=0.35H, electric capacity C=29 μ F, resistance R=0.1 Ω, resonant frequency
=50Hz, during resonance
, quality factor
=54908.9.When electric power system fault, on electric power system protective wire 4, power frequency is 50Hz, and coupling filter 2 is 120689.7 Ω to the resistance value of this frequency current, very greatly, approximate can think open circuit; And for audio signal (audiorange 100Hz-12kHz), because quality factor q is very large, therefore it is very little for the resistance value of the current signal of this frequency range, realize the effect of coupling filtering, namely smoothly can pass through audio signal (audiorange 100Hz-12kHz), and blocking effect is produced to 50Hz AC signal.The effect of coupling filter 2: block 50Hz and exchange, audio signal (audiorange 100Hz-12kHz) smoothly can be passed through, have impedance matching effect simultaneously concurrently.
Transformer Winding in coupling filter 2 plays the impedance matching effect of linear transformer, total ground resistance of transmitting antenna 4 (i.e. load resistance, safety standard specifies to be less than or equal to 2 Ω) can be transformed into the numerical value determined resistive audio frequency enlarger 1 and require by the no-load voltage ratio adjusting transformer.
Electric power system ground device adopts multipoint earthing, and such as ground device 3 and ground device 6 and the earth form loop.Ground device 3 one end and the transmitting antenna 4 be connected with coupling filter lead-out terminal d connect, other end ground connection, ground device 6 one end and the transmitting antenna 4 be connected with coupling filter input terminal c connect, other end ground connection, and ground device 3 and ground device 6 form path by the earth.Ground device 3 acts on ground device 6: form loop together with the earth, play transmitting antenna effect.
Apparatus for receiving audio 5 is ordinary audio reception earphone, east sub-board/DX-820 earphone that the present embodiment adopts company of equipment Co., Ltd of Liyang Dongfang Electronics to produce, be arranged on after being reequiped on safety helmet, employing mine lamp power is powered, with audio signal wireless connections, receive audio alarming signal that sent by audio frequency enlarger 1, that launched by transmitting antenna 4.Apparatus for receiving audio 5 acts on: audio reception warning wire size is also amplified, and produces alarm sound.
operating principle of the present invention:
The present invention adopts protection (PE) line of underground power supply system as transmitting antenna 4, and protective wire in use must be connected to every platform consumer, so change antenna lay length problem without the need to considering.And according to safety code, protective wire is all-in resistance≤2 Ω over the ground, make the output resistance coupling simple possible of audio frequency enlarger 1.During in order to eliminate electric power system fault, 50Hz alternating current is on the impact of audio frequency enlarger 1, have employed coupling filter 2.
Transmitting antenna 4 is connected on the load (substitute loudspeaker) of output as audio frequency enlarger 1 of audio frequency enlarger by coupling filter 2.The alarm signal of the output of coupling filter 2 forms electric current by protection (PE) line 4 as transmitting antenna electric power system; this electric current formed electromagnetic field is to transmitting antenna 4 surrounding space transmitting audio frequency alarm signal; cover each region of transmitting antenna 4 processes, the audio alarming signal that described transmitting antenna 4 is launched is received by each apparatus for receiving audio 5 in each region and realizes the radio alarming of down-hole.
The audio alarming signal that audio frequency enlarger 1 sends is transported on the electric power system protective wire as transmitting antenna 4 by coupling filter 2.Electric power system protective wire is received on the electric installation of each equipment in down-hole, plays safeguard protection effect, not charged time normal, has earth current (50Hz) during fault, but voltage-to-ground can not exceed the special lower security voltage of national regulation, must at below 50V.Audio alarm system does not work at ordinary times, and only just report to the police when mine disaster occurs, according to 100W enlarger, output resistance 8 Ω calculates, and the electric power system protective wire voltage-to-ground that during warning, audio signal (audiorange 100Hz-12kHz) causes is 28.3V(to the maximum
), also meet safety standard.
The effect of coupling filter 2 of the present invention is:
1. parallel resonance frequency is 50Hz, and namely when this frequency, coupling filter 2 presents very large impedance, and when electric power system generation leak current fault, the 50Hz alternating current on transmitting antenna 4 can not have an impact to audio frequency enlarger 1; And be non-resonant for audio alarming signal (100-12kHz), audio alarming signal can arrive transmitting antenna 4 through less impedance.
2. play impedance matching effect, the load impedance determining resistive audio frequency enlarger 1 is 8 Ω, and according to electric power system code requirement, total ground resistance of transmitting antenna 4 is forbidden to be greater than 2 Ω, transformer in coupling filter 2 plays the impedance matching effect of linear transformer, total ground resistance (i.e. load resistance) of transmitting antenna 4 can be transformed into the numerical value determined resistive audio frequency enlarger 1 and require by the no-load voltage ratio adjusting transformer.
Apparatus for receiving audio 5 receive transmitting antenna 4 occur audio signal, by apparatus for receiving audio 5(earphone) sounding and realize broadcast report to the police.
Above-described embodiment only have expressed one embodiment of the present invention, but therefore can not be interpreted as limitation of the scope of the invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.
Claims (4)
1. a down-hole audio broadcasting warning device, comprises the audio frequency enlarger as signal transmitter, ground device, apparatus for receiving audio, it is characterized in that, the described output of audio frequency enlarger is connected with the input of coupling filter, and the output of coupling filter is connected with transmitting antenna; Audio frequency enlarger arranges two lead-out terminals, a lead-out terminal is connected with the input terminal of coupling filter, another lead-out terminal is connected with the lead-out terminal of coupling filter, another input terminal of coupling filter, lead-out terminal are connected in series in transmitting antenna loop respectively, and ground device connects and composes loop with transmitting antenna respectively; Described transmitting antenna is the protective wire of underground power supply system, and described coupling filter connects and composes resonance circuit by the winding of transformer and Capacitance parallel connection, and resonant frequency is 50Hz.
2. audio broadcasting warning device in down-hole according to claim 1, is characterized in that, the audiorange 100Hz-12kHz of described audio frequency enlarger.
3. audio broadcasting warning device in down-hole according to claim 1, is characterized in that, described apparatus for receiving audio adopts earphone.
4. audio broadcasting warning device in down-hole according to claim 3, is characterized in that, described earphone and audio signal wireless connections.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310292686.1A CN103334793B (en) | 2013-07-12 | 2013-07-12 | Underground audio broadcasting alarming device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310292686.1A CN103334793B (en) | 2013-07-12 | 2013-07-12 | Underground audio broadcasting alarming device |
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| Publication Number | Publication Date |
|---|---|
| CN103334793A CN103334793A (en) | 2013-10-02 |
| CN103334793B true CN103334793B (en) | 2015-06-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310292686.1A Expired - Fee Related CN103334793B (en) | 2013-07-12 | 2013-07-12 | Underground audio broadcasting alarming device |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2211674Y (en) * | 1994-07-26 | 1995-11-01 | 陈仪坤 | Frequency modulating power amplifier |
| CN2313336Y (en) * | 1997-06-06 | 1999-04-07 | 陶成果 | Multifunction cordless receiving device |
| CN1241072A (en) * | 1998-07-03 | 2000-01-12 | 重庆新大地电子有限公司 | Method and system for VLF ground-wave broadcast and communication |
| CN203335133U (en) * | 2013-07-12 | 2013-12-11 | 河北联合大学 | Downhole audio broadcasting alarm device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100462149B1 (en) * | 2002-04-09 | 2004-12-17 | 이명신 | Auto grounding switching circuit |
| KR100857769B1 (en) * | 2008-01-11 | 2008-09-09 | 주식회사 동양이지텍 | Ground equipment with microcomputer for electric field-shielding of hot-water boiler mat |
-
2013
- 2013-07-12 CN CN201310292686.1A patent/CN103334793B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2211674Y (en) * | 1994-07-26 | 1995-11-01 | 陈仪坤 | Frequency modulating power amplifier |
| CN2313336Y (en) * | 1997-06-06 | 1999-04-07 | 陶成果 | Multifunction cordless receiving device |
| CN1241072A (en) * | 1998-07-03 | 2000-01-12 | 重庆新大地电子有限公司 | Method and system for VLF ground-wave broadcast and communication |
| CN203335133U (en) * | 2013-07-12 | 2013-12-11 | 河北联合大学 | Downhole audio broadcasting alarm device |
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| Publication number | Publication date |
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| CN103334793A (en) | 2013-10-02 |
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