CN2673753Y - Portable railroad train broadcasting system detection device - Google Patents
Portable railroad train broadcasting system detection device Download PDFInfo
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- CN2673753Y CN2673753Y CN 200320104762 CN200320104762U CN2673753Y CN 2673753 Y CN2673753 Y CN 2673753Y CN 200320104762 CN200320104762 CN 200320104762 CN 200320104762 U CN200320104762 U CN 200320104762U CN 2673753 Y CN2673753 Y CN 2673753Y
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Abstract
The utility model provides a portable detection device for a railroad train broadcasting system, which comprises a casing and a cassette mechanism, wherein, the cassette mechanism is provided with a digital voice circuit, an audio-frequency power amplifying circuit and an overload protecting circuit. The digital voice circuit generates voice signals which are amplified by the audio-frequency power amplifying circuit and boosted by an output transformer to be fed into a train broadcasting system, and the detection of the broadcasting effect of the train broadcasting system is achieved through the examination on hearing effects. The overload protecting circuit can be used for checking faults of the train broadcasting system. The utility model has the advantages of simple structure, small volume, light weight, low cost, convenient carrying, rapid connection and easy operation and adapts to the requirement of on-site transient detection.
Description
Technical field
The utility model relates to railroad train loud system docking facility, particularly a kind of portable railroad train loud system detecting device.
Background technology
Passenger train is the important window that society is served in railway transport of passengers, is related to the image and the reputation of railway, and broadcasting for train is important medium of handling the train accident, is again the critical facility that railway is served the passenger.Therefore, the broadcast quality of loud system and safety are very important, need often detect, keep in repair, to guarantee its reliable and stable and safety.But, passenger vehicle car depot does not still have specialized equipment to detection, the maintenance of passenger vehicle loud system at present, passenger vehicle shed repair and current maintenance are according to examining feedack with car team basically, carry out simple process, the situation that feedback information is omitted also can take place sometimes, fault fails in time to handle, influence broadcast effect, even accident appears, reduce the service quality of train, the image and the reputation of infringement railway interests.
The utility model content
The purpose of this utility model is to provide a kind of economic, easy to use detecting device simple in structure, suitable for the maintenance of railroad train loud system.It can detect the various faults of train broadcasting system accurately, quickly and easily, and easy access personnel in time get rid of, and guarantees that train broadcasting system keeps normal condition at any time, and premium-quality broadcast service is provided.
The utility model design-calculated principle is " suitable, convenient, fast, efficient ", comprises following aspect content:
The electroacoustic performance measuring ability of the loud system of device
The loud system of passenger train is made of the speech amplifier that is positioned over the train public address room and the broadcasting bus that connects full train, the broadcast line that is distributed in each compartment, switch, impedance transformer, loud speaker etc. usually, and what need detection is the electroacoustic performance of the train broadcasting system except that speech amplifier.Usually, the electroacoustic performance of a loud system of test is to adopt the method for its Frequency Response of test to realize, promptly to the fixing sine wave signal of system's feed-in one amplitude, the frequency of signal gradually changes in system's broadcast frequency band from low to high, the intensity of sound value is measured at each loud speaker fixed range point place at system of distance, and draw cooresponding with it input signal amplitude and the cooresponding curve of frequency, just can record the electroacoustic performance characteristic of public address system.But this method is for the car depot that is furnished with more than 1000 passenger vehicle, and is both unrealistic, meaningless again.Consider the characteristics of train public address system, must be very not high to the requirement of Frequency Response, the electroacoustic performance of loud system is judged with the subjective feeling of people's ear and is got final product.Therefore, design concept is by the music signal to broadcasting for train bus feed-in certain voltage and power, and by service personnel each compartment of train of passing by, the auditory perception of personnel selection is checked the situation of train broadcasting system, judge the broadcast effect, realize detection train broadcasting system.
The detection of passenger vehicle loud system fault and install the safety protection function of self
Because the load of detecting device is full row broadcasting, it is heavier to load, and the situation that overload or partial short-circuit occur happens occasionally, and must have corresponding technical measures to be taken precautions against, in order to avoid detecting device damages; Simultaneously, service personnel uses this device also can search the fault of system.
The technical solution of the utility model is: a kind of portable railroad train loud system detecting device, comprise casing and movement, it is characterized in that: described movement is provided with digital speech circuit, audio-frequency power amplifier and audiofrequency output voltage transformer, the digital speech circuit is imported audio-frequency power amplifier by blocking condenser and audio-frequency power amplifier coupling with sound signal; Sound signal after audio-frequency power amplifier will amplify is input to output transformer, and the sound signal after this voltage transformer boosts is made test signal by the audio output feed-in train public address system on the casing.
Described digital speech circuit adopts digital speech integrated circuit of recording and playbacking piece, or digital MP3 player, or the digital recording pen.
Described audio-frequency power amplifier outlet line is connected with overload protecting circuit, and this circuit also is the testing circuit of passenger train loud system fault.
The final stage amplifying circuit of described audio-frequency power amplifier adopts the two-tube parallel connection of power-type fet.
Described overload protecting circuit is made of photoelectricity coupled circuit, overload signal modulate circuit and voltage comparator, relay overload protection executive circuit.
Described audio power output stage is provided with the audio monitoring circuit.
The beneficial effects of the utility model are: simple in structure, volume is little, in light weight, economic and practical, cost is low, easy to carry, fast wiring, simple to operate, adapts to very much the needs of on-the-spot flow detection.
Description of drawings
Fig. 1 is a functional block diagram of the present utility model.
Fig. 2-the 1st, a kind of digital speech circuit diagram among Fig. 1.
Fig. 2-the 2nd, another kind of digital speech circuit diagram among Fig. 1.
Fig. 3 is output-stage circuit figure among Fig. 1.
Fig. 4 is Fig. 1 sound intermediate frequency power gain (being the power amplifier of Fig. 3) circuit diagram.
Fig. 5 is overload protecting circuit figure among Fig. 1.
Fig. 6 is DC transfer circuit figure among Fig. 1.
Fig. 7 is that case panel of the present utility model is arranged scheme drawing.
The specific embodiment
Describe the utility model in detail below in conjunction with accompanying drawing.
This device comprises casing and movement.Referring to Fig. 1: movement is provided with digital speech circuit, audio-frequency power amplifier, audiofrequency output voltage transformer T, DC transfer circuit, overload protecting circuit.The key component of this device is digital speech circuit, audio-frequency power amplifier and overload protecting circuit thereof.
Referring to Fig. 2-1, Fig. 2-2: the digital speech circuit is used to produce the voice signal of certain amplitude, its effect is that audio analog signals is converted to audio digital signals, and be stored in the digital memeory, when carrying out speech play, audio digital signals is reduced to analog voice signal, after Filtering Processing, exports.The digital speech circuit can adopt various ways, for example: adopt digital MP3 player or digital recording pen to realize, referring to Fig. 2-1; Adopt ISD series digit speech IC piece JP3 (the optional ISD25120 of model) and a small amount of peripheral cell to realize, referring to Fig. 2-2; Also can adopt by the short digital speech integrated circuit of the reproduction time of originating firm disposal solidifying (music door-bell, reversing signal language etc.) and realize.
Referring to Fig. 3, Fig. 4: audio power amplifying circuit to the sound signal IN from the digital speech circuit carry out voltage, electric current amplifies, and again by the output transformer T feed-in train public address system that boosts, plays out audio speech by the loud speaker of train public address system.Be connected with the audio monitoring circuit that constitutes by resistance R 8, loud speaker SP in the power amplifier output stage.The structure and the principle of audio power amplifying circuit are known, will not carefully state, and what must stress is that audio-frequency power amplifier adopts breakaway-element.This be because: because the load of this detecting device is full row broadcasting, it is heavier to load, and appearance is transshipped or the situation of partial short-circuit happens occasionally in practice, is the Chinese People's Anti-Japanese Military and Political College's load impact ability that improves audio-frequency power amplifier, needs to use some specific function elements; Adopt power-type field effect triode (T1, T2, T3, T4 can adopt IRF series, as model IRF250) in the final stage amplifying circuit of this audio-frequency power amplifier, two-tube in parallel the use; Field effect transistor belongs to voltage devices, and general bipolarity aerotron belongs to current device, this has just determined in parallel use of field effect transistor to have the performance of automatic current equalizing, and density of current certain some concentrations and make the defective of pipe scaling loss on semiconductor wafer can not appear in field effect transistor itself yet simultaneously.
Referring to Fig. 5: overload protecting circuit is the protective circuit of this device, is again the important technical that service personnel is searched the loud system fault.In the overload protecting circuit, IC2 is photoelectricity coupled circuit (selecting TLP521-1 for use), play coupling overload signal and electricity isolation, the photoelectric receiving tube of IC2 and resistance R 2, capacitor C 1, C2, potential device W constitutes the overload signal modulate circuit, its effect is that overload signal is converted to suitable voltage signal, comparator IC1 (selecting LM324 for use), resistance R 3, R4, capacitor C 3 and constitute voltage comparator with Schmidt's characteristic from the stable 5V voltage of three terminal regulator U1 (model 7805), when overload signal reached setting valve, mouth 1 pin of 1C1 turn to high level (greater than 10V) by low level (less than 0.2V); Aerotron Q1, resistance R 5, R14 and relay J 12A constitute the overload protection executive circuit; relay J 12A open contact J12B and normally closed button S1 constitute protection action lock-out circuit; when the overload blackout; Q1 ends; pressing button S1; relay J 12A dead electricity discharges, and the protection executive circuit resets.Under the protection executive circuit reset mode, the normally closed contact J12C closure of relay J 12A, the output signal of power amplifier is directly through voltage transformer T and insurance F2 output; Relay J 12A action; J12C disconnects; the output signal of power amplifier is exported to voltage transformer T through current-limiting resistance RL; RL plays the effect of protection power amplifier; the sound signal output that keeps limited power simultaneously; so that in a single day overload or short trouble are eliminated, the train public address system recovers broadcast immediately, and this function is searched train broadcast fault for service personnel great convenience is provided.By evidence, instantaneous short circuit when taking place (time length is about 0.5-1s) in the output of this detecting device, and protective circuit is failure to actuate, and the long protective circuit of short circuit duration is just moved, and power amplifier does not have any strange phenomena.This in permutation broadcasting checking process because of the people in short-term who causes because of carelessness is short circuit, the protective circuit of detecting device can escape, and avoids losing time for walking back this detecting device place to this detecting device reset detection personnel.
Referring to Fig. 6: DC transfer circuit for digital speech circuit, power amplifier and overload protecting circuit provide respectively+5V ,+12V, ± working power of 24V.In the circuit, F1 is a power supply overcurrent protective tube, and diode D1 is used to prevent that power supply from connecing instead, and it is correct that D3, R4 are used to indicate the 48V power supply to insert; Resistance R 12, the heavy current impact that when R3 is used to prevent to power on capacitor C 1, C2 charging is caused; Resistance R 8, R9, aerotron Q2, diode D4, capacitor C 4, C3 constitute the 12V constant voltage power suspply; Integrated three-terminal regulator U1 and capacitor C 5 constitute the 5V constant voltage power suspply; R7 is the current-limiting resistance of fan A; Resistance R 5, R6, capacitor C 1, C2 constitute the 24V power supply.
Referring to Fig. 7: the machine shell panel of this device is provided with external source input terminal (or jack) a, b, source switch K, power supply indication D3, audiofrequency output terminal (or jack) c, d (being used for sound signal is sent into train public address system bus and debugging broadcast effect), overload light D6, overload reset button S1, socket F1 ', the F2 ' of protective tube F1 (1.5A), F2 (3A), overload light D6, overload reset button S1 are used for service personnel and search fault.
This device also can add holding storage battery and charge circuit according to actual needs, when detecting to be ready for use on the passenger vehicle bicycle, uses during because of compartment power supply deficiency.
The working process of this detecting device: power input terminal a, b inserts the DC48V power supply on vehicle by plug-in unit, electric fan A starts working, the power turn-on K switch, (this signal is 20 minutes a music signal to digital speech circuit output audio signal, automatic circulation is play), carry out power gain through audio-frequency power amplifier, boost by voltage transformer T and to export audio output jack c on the machine shell panel to, d, line is drawn test signal feed-in train public address system after tested, the loud speaker of train public address system plays out voice, by service personnel each compartment of train of passing by, check the situation of train broadcasting system by means of people's auditory perception, judge the broadcast effect, realize detection train broadcasting system; Simultaneously, the monitoring loudspeaker SP in this detecting device can play out musical sound, can check also, judge whether this detecting device is working properly.
When overload or short circuit take place in train broadcasting system, the relay J 12A action in the protective circuit, its contact J12C that is connected in the audiofrequency output circuit disconnects, and restriction sound signal horsepower output plays the effect of protection detecting device; Simultaneously, the contact J12B closure of relay J 12A, overload indication light-emitting diode D6 gets electroluminescence, and the prompting service personnel is searched fault.Press reset button S1, recover the sound signal output of normal power, if overload or short circuit phenomenon are not eliminated, protective circuit can be moved once more, so repeatedly, and till service personnel is found and is got rid of fault.
Claims (8)
1. portable railroad train loud system detecting device, comprise casing and movement, it is characterized in that: described movement is provided with digital speech circuit, audio-frequency power amplifier and audiofrequency output voltage transformer, the digital speech circuit is imported audio-frequency power amplifier by blocking condenser and audio-frequency power amplifier coupling with sound signal; Sound signal after audio-frequency power amplifier will amplify is input to output transformer, the audio output feed-in train public address system of the sound signal after being boosted by this voltage transformer on casing.
2. portable railroad train loud system detecting device according to claim 1 is characterized in that: described digital speech circuit adopts digital speech integrated circuit of recording and playbacking piece.
3. portable railroad train loud system detecting device according to claim 1, it is characterized in that: described digital speech circuit adopts digital MP3 player.
4. portable railroad train loud system detecting device according to claim 1 is characterized in that: described digital speech circuit adopts the digital recording pen.
5. portable railroad train loud system detecting device according to claim 1, it is characterized in that: described audio-frequency power amplifier outlet line is provided with overload protecting circuit.
6. portable railroad train loud system detecting device according to claim 1 is characterized in that: the final stage amplifying circuit of described audio-frequency power amplifier adopts the two-tube parallel connection of power-type fet.
7. portable railroad train loud system detecting device according to claim 5 is characterized in that: described overload protecting circuit is made of photoelectricity coupled circuit, overload signal modulate circuit and voltage comparator, relay overload protection executive circuit.
8. portable railroad train loud system detecting device according to claim 1, it is characterized in that: described audio power output stage is provided with the audio monitoring circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320104762 CN2673753Y (en) | 2003-12-31 | 2003-12-31 | Portable railroad train broadcasting system detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200320104762 CN2673753Y (en) | 2003-12-31 | 2003-12-31 | Portable railroad train broadcasting system detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2673753Y true CN2673753Y (en) | 2005-01-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200320104762 Expired - Fee Related CN2673753Y (en) | 2003-12-31 | 2003-12-31 | Portable railroad train broadcasting system detection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2673753Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107770735A (en) * | 2017-09-11 | 2018-03-06 | 浙江众合科技股份有限公司 | A kind of vehicle radio station and vehicle-mounted broadcasting method of testing |
| CN109067491A (en) * | 2018-08-23 | 2018-12-21 | 天津市北海通信技术有限公司 | Broadcasting for train Voice Surveillance method, platform and system |
-
2003
- 2003-12-31 CN CN 200320104762 patent/CN2673753Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107770735A (en) * | 2017-09-11 | 2018-03-06 | 浙江众合科技股份有限公司 | A kind of vehicle radio station and vehicle-mounted broadcasting method of testing |
| CN109067491A (en) * | 2018-08-23 | 2018-12-21 | 天津市北海通信技术有限公司 | Broadcasting for train Voice Surveillance method, platform and system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Free format text: FORMER NAME OR ADDRESS: WANG GENG Owner name: SCIENCE AND TECHNOLOGY INSTITUTE OF CHENGDU RAILWA Free format text: FORMER NAME OR ADDRESS: LEI YADONG |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 610082, No. two, section 11, North Ring Road, Jinniu District, Sichuan, Chengdu Patentee after: Science & Technology Inst., Chengdu Railway Bureau Address before: 610082, No. two, section 11, North Ring Road, Jinniu District, Sichuan, Chengdu Co-patentee before: Wang Geng Patentee before: Lei Yadong |
|
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |