CN86210522U - Air pressure detecting system for microcomputer controlled communication cable - Google Patents
Air pressure detecting system for microcomputer controlled communication cable Download PDFInfo
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- CN86210522U CN86210522U CN 86210522 CN86210522U CN86210522U CN 86210522 U CN86210522 U CN 86210522U CN 86210522 CN86210522 CN 86210522 CN 86210522 U CN86210522 U CN 86210522U CN 86210522 U CN86210522 U CN 86210522U
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- cable
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- air pressure
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- pressure detector
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- 238000004891 communication Methods 0.000 title abstract description 7
- 238000001514 detection method Methods 0.000 claims description 13
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- 230000006870 function Effects 0.000 abstract description 2
- 238000012937 correction Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
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- 238000004519 manufacturing process Methods 0.000 description 4
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Abstract
The utility model relates to an air pressure detecting system for a communication cable controlled by a microcomputer, which is equipment for maintaining and detecting a cable. The utility model adopts a work mode of time division, accurately detects the air pressure of multiple positions in the cable and raises the alarm for air leak. A host of the system is controlled by a microcomputer and can correct detect precision and linearization. By only occupying two signal lines, the system can completes the functions of remote power supply, call, feedback and pressure signal collection. The utility model has the advantages of small size, light weight and low power consumption. The utility model can be arranged in the cable.
Description
The present invention relates to the equipment of a kind of maintenance, detection streamer, belong to international Patent classificating number GO1M3/00, HO2G1/00.
The development of modern communications technology and urban construction is increasing the length of burying underground cable underground year by year, and the dry gas that underground cable all needs to charge into certain pressure could guarantee normal the use.For various reasons, leakage phenomenon often takes place in the gas in the cable, fixes a breakdown as untimely, and cable very causes cisco unity malfunction and damaged.
The maintenance of cable and leakage detection are user's things of inconvenience the most, once adopted the leak detection of mercury signalling means in the past, but use inconvenient and easily broken, the system of " cable air pressure automatic telemetering " civilian described cable air pressure detection that " electronic science and technology " the 10th phase in 1986 delivered has advanced much than mercury signalling means, but, it uses frequency division system because calling out each check point, and signal wire intrinsic frequency band just limited the number of check point, this makes the position of desiring more accurate definite gas leakage point on toll cable be restricted.The employed ys-18 type of this system pressure signal device adopts corrugated tube as sensor in addition, thereby volume is bigger, and the cable inside of can not directly packing into need add air chamber and place, and this also brings inconvenience for engineering construction.Because the pressure sensor of pressure signal device is that its accuracy is not high and reliability is not good enough yet by the principle work of mechanical deformation.
Have through the patent retrieval article close with the present invention: US4327242, JP44-17469, JP46-24830, US4091658, they all are maintenance cables, the equipment of inflation does not have system controlled by computer automatically, does not patrol the function of surveying communication cable automatically.
The mankind enter the information age now, cable as the information of transmission, neither one high-level efficiency, high-speed, highly reliable Leak Gas Pressure Detection is extremely disproportionate, the deficiency that the present invention is directed to known technology adopts the system controlled by computer main frame, the working method of cutting apart with the time, take two signal wires, just can carry out remote power feeding to a plurality of semiconductor pressure detecting devices of the cable inside of directly packing into, call out and the passback collection, and with sound, the warning of light dual mode, the pressure data of each check point of print record automatically.In 60 kilometers communication cables, detect accurately, reliable.
Formation of the present invention is as shown in Figure 1: main frame (1), it is made up of Microcomputer Detecting System (2) and microcomputer external interface device (3), semiconductor pressure detecting device (4), be contained in cable splice (6) inside of underground cable (5), several pressure detectors are contained in the inner different position of cable, are connected in parallel on the signal wire (7).
The detailed formation of main frame (1) is seen accompanying drawing 3, and it is by TP801-A single card microcomputer (8), and data acquisition board (9), warning system (10), working method change-over circuit (11), mini-printer (12) constitute.
The detailed formation of pressure detector (4) is seen accompanying drawing 3, and it detects amplifying circuit (15), feed circuit (16) formation by shaping circuit (13), call circuit (14).
Be associated with two signal line (7) between main frame and the pressure detector, in order to transmitting the control signal of main frame, and the pressure information that detects returned to main frame pressure detector.
The technology of the present invention unique distinction is: designed control signal has four attitudes, sees shown in the accompanying drawing 2, i.e. high level state (A) (E), low level state (C), hopping edge (B) and high-impedance state (D) one of four states.Total system utilizes these four kinds of different conditions to finish every work:
Utilize high level (first) (A) to finish the initialization of mainframe program; The power supply of detecting device, the zero setting of detecting device call circuit;
Utilize negative hopping edge (B) and low level (C) to finish on the calling of pressure detector, the signal wire and add releasing of energy storage;
Utilize high-impedance state (D) to finish the data acquisition of the passback of detection signal (by pressure detector to main frame), main frame;
The energy that utilizes high level (E) to finish detecting device replenishes, data processing (being storage, demonstration, driving, sound, light alarm system and the correction etc. of data).
Like this, rely on one four attitude negative pulse of shape such as accompanying drawing 2, finished to the total system harmony once circulation, i.e. pressure detector work finishes.Second four attitude negative pulse can make second pressure detector work finish successively, and all working up to all pressure detectors finishes.Should be pointed out that and adopt positive transition along cooperating (A), (C), (D), (E) also can finish whole system operation.
In brief, the characteristics of the technology of the present invention design are: utilize the control signal of four attitudes to finish every work such as power supply, calling, detection collection in the mode of time-division.
Main frame produces the control signal of periodic four attitude negative pulses as this system, and it is matched with working method change-over circuit (11) by TP801A single card microcomputer (8), data acquisition board (9) and finishes.The CTC chip (17) of the control of repetition period T in the accompanying drawing 4, passage 2 is done timing working, passage 3 is done counting work, and permission interrupt request, passage 2 use of connecting with passage 3, provide long period T with interrupt mode, can change the repetition period T of pulse by the initialization data that changes passage 3.Four attitude undersuings come Control work mode change-over circuit (11) to produce by TP801A single card microcomputer (8), the working method change-over circuit as shown in Figure 5, on the signal wire and connect three transistor Ts
2, T
3, T
4Form suitable three switches of their effect of duty change-over circuit (23 '), be in charge of five parts of four attitude negative pulse waveforms.During start just, T
2, T
3, T
4Do not work, work as T
2When the pipe base stage is in noble potential, T
2Conducting, the 15V power supply passes through T
1To all pressure detector power supplies on the signal wire, power-on time is decided by T
2ON time, this is four attitude negative pulse waveforms (A) districts.T
2Pipe ends, T
3When base stage is in noble potential, T
3The Continuity signal line passes through R
5With T
3Discharge, (B) district that forms four attitude negative pulse waveforms distinguishes with (C), works as T
3Pipe ends, T
4Being conducting, at this moment is (D) district of four attitude pulse waveforms, by T
4The low level control analog switch 4053(23 that collector produces), the emitter follower of signal wire and high input impedance is joined, make main frame be in high internal resistance state, wait for back production voltage, because back production voltage also will be given the charging of signal wire distributed capacitance, so the collection point is the afterbody in (D) district, after collection is finished, recover T
2Conducting continues to give the pressure detector electric energy supplement, and Here it is (E) distinguishes.Because T
2, T
3, T
4Conducting in turn just can produce four attitude negative pulse waveforms as shown in Figure 2 on signal wire.T
2, T
3, T
4The control of three pipes is to add respectively that on their base stage high level (5V) gets final product, these three voltages are from the output port of PIO chip (18), all can with the standby PIO chip of TP801A or with external PIO chip, be easy to change the high-low level of output port and the time that level exists with program, adjust control easily, adopt electronic switch, the life-span is long, reliable operation.
Main frame is gathered at the afterbody in (D) district of four attitude negative pulses, and the aanalogvoltage that collects is delivered to data acquisition board.Data acquisition board block scheme (seeing accompanying drawing 6), its composition is: interface chip CTC(17) and PIO(18), wherein address before the repetition period T(of CTC chip controls four attitude negative pulses), the PIO chip is used for producing gating pulse, according to the requirement of cable under test number, can use several chip; Analog to digital converter adopts ADC0809 chip (19), and 74LS138 chip (20) is to produce chip selection signal to be used for controlling CTC, the work of PIO and ADC-0809; Collection plate control signal generator (21) is by 74LS74,74LS-02, and 74LS01 forms, and it produces the needed time clock of ADC0809 and initiating signal and the required M of PIO chip
iSignal; Stepping Acquisition Circuit (22) is by 14052B chip and transistor T
A, T
B, T
CForm, the back production voltage of being sent here by working method change-over circuit (11) is to the stepping Acquisition Circuit, with stabilivolt the voltage of each pressure detector collection passback carried out stepping, to correct because the error that pressure transducer " zero-bit output " parameter dispersiveness is caused; Utilize stabilivolt will return the irrelevant part of voltage and air pressure and carry out incomplete restriction, this can distinguish again: it is different that zero air pressure and pressure detector break down, the high resistance area (D) of gathering voltage and being in four attitude negative pulses carries out, can make like this because the distance of pressure detector telecommunication cable interior location of living in is different, and the error that passback voltage loss difference is caused is reduced.This exquisite composition part of the present invention just.Aanalogvoltage after the stepping collection is delivered to ADC0809 chip (19), carries out analog to digital conversion, and the data after the conversion are delivered to single card microcomputer TP801A(8) carry out accuracy correction and data processing, this part work is finished in four attitude negative pulses (E) district.
It is very necessary carrying out accuracy correction, this be because: 1. since pressure transducer (outsourcing piece) parameter in the pressure detector disperse, the linearity that has is also poor, 2. in the position difference of long haul communication cable upward pressure detecting device, passback voltage attenuation inconsistent (although air pressure numerical value is identical) is if without correction, very big test error will take place, even wrong report.The present invention adopts software to proofread and correct, its method is: each pressure detector is had corresponding correction coefficient, and correction coefficient is to compare to survey through pressure detector and normal barometer to draw the data after the correction, send into internal memory again, in order to the usefulness of demonstration, printing and warning.
The whole software solidifications of main frame are in EPROM, and software flow is seen accompanying drawing 7.As long as start, main frame just sends as shown in Figure 2 periodic four attitude negative pulses to tested cable, point of every survey just shows tested numerical value immediately, after treating that a cable has been surveyed, be automatically brought to the second cable, after all wireline test finishes, mini-printer will be got whole test results, when air pressure is lower than 0.3kg/cm
2The time (this value be the determined value of customer requirements), report to the police simultaneously with sound, two kinds of forms of light.
The The general frame of pressure detector is seen accompanying drawing 3, after the detector switch that lifts main frame, (8), (11) of main frame are sent the control signal as accompanying drawing 2 at once, distinguish at (A), main frame carries out remote power feeding to all pressure detectors, through feed circuit (16), produce positive 15V direct supply voltage supply force detector and use.Utilize a reset circuit to make call circuit (14) zero setting in the process setting up of growing out of nothing of supply voltage.At (B), (C) district, control signal is negative jumping degree, the received control signal waveform of pressure detector degenerates because of remote transmission, in order to increase operating distance and to improve reliability, must give shaping, through shaping circuit (13), the waveform of output is all more satisfactory aspect amplitude and hopping edge.Remove to trigger call circuit (14) with it, the power supply of the called logical automatic joint detection amplifying circuit of call circuit (15), carrying out air pressure detects, after detection signal is exaggerated, main frame is given in passback again, carries out data acquisition at (D), so just is logical pressure detector, the control signal of main frame becomes high level (E) district again afterwards, at this district's main frame to all pressure detectors supplementary power again.Whenever control signal (i.e. four attitude negative pulses) occurs once, just be logical pressure detector; So repeat down, until being logical whole pressure detectors.
The circuit of pressure detector is formed as shown in Figure 8.
Feed circuit are by D
1, C
1Form; Shaping circuit is made up of a part of 4069 (six reversers a group) and a part of 4013 (double D trigger half); Call circuit is made up of the part of a part of 4013 (double D trigger second half) 4024,4069 (six reversers five groups) and 4068; Detect amplifying circuit by 4052,3DJ2H, DYC sensor and μ A741 form.
The structure of pressure detector is to design according to the principle of occupying minimum volume, adopts the structure of trapezoid cross section, and has shielding, resistant to elevated temperatures effect.Because fully taping the latent power in the design, components and parts selected has pressure detector: volume is little, in light weight, the characteristics of low-power consumption, high reliability.Its weight is: 0.22kg, volume are 30 * 19 * 200mm
3
Native system is surveyed at the 60km cable line, calls out, gathers, stores, writes down all normally operation.
Accompanying drawing 7 is the native system software flow pattern, wherein:
(24) PIO, CTC initialization
(25) internal memory zero clearing or initialization.
(26) pressure detector is powered.
(27) interrupt, carry out interrupt service routine: gather the pressure detector atmospheric pressure value, and deposit internal memory in.
(28) the back production data are carried out accuracy correction,, report to the police with sound, light if any gas leakage.
(29) judge whether last pressure detector.
(30) show tested cable atmospheric pressure value.
(31) print whole test results.
Claims (4)
1, a kind of system controlled by computer telecommunication cable air pressure detection system comprises main frame (1), external interface device (3), and pressure detector (4) is characterized in that: main frame (1) is made up of Microcomputer Detecting System (2) and microcomputer external interface device (3); External interface device (3) is made up of working method change-over circuit (11) and data acquisition board (9); Pressure detector (4) is the pressure detector made from semiconductor pressure sensor, is contained in cable splice (6) inside of underground cable (5), and several pressure detectors are contained on the different parts of cable inside, are connected in parallel on the signal wire (7).
2, system controlled by computer telecommunication cable air pressure detection system according to claim 1, it is characterized in that: said working method change-over circuit (11) is by duty change-over circuit (23 ') and analog switch 4053(23) form.
3, system controlled by computer cable air pressure detection system according to claim 1, it is characterized in that: said data acquisition board (9), by interface chip CTC(17), PIO(18), ADC0809 chip (19), 74LS138 chip (20), stepping Acquisition Circuit (22), collection plate control signal generator (21) constitutes.
4, system controlled by computer telecommunication cable air pressure detection system according to claim 1, it is characterized in that: said pressure detector (4) is to adopt semiconductor pressure sensor to make sensitive element, it is by shaping circuit (13), call circuit (14), detect amplifying circuit (15), feed circuit (16) constitute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86210522 CN86210522U (en) | 1986-12-23 | 1986-12-23 | Air pressure detecting system for microcomputer controlled communication cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86210522 CN86210522U (en) | 1986-12-23 | 1986-12-23 | Air pressure detecting system for microcomputer controlled communication cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN86210522U true CN86210522U (en) | 1987-10-28 |
Family
ID=4812190
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 86210522 Withdrawn CN86210522U (en) | 1986-12-23 | 1986-12-23 | Air pressure detecting system for microcomputer controlled communication cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN86210522U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102575970A (en) * | 2009-09-25 | 2012-07-11 | 伊斯曼柯达公司 | Thermal Sensors for Flexible Waveguides |
| CN105591329A (en) * | 2014-10-23 | 2016-05-18 | 无锡市金力电力成套设备有限公司 | Pressure detection-type cable clamping hanging frame |
| CN105591332A (en) * | 2014-10-24 | 2016-05-18 | 无锡市金力电力成套设备有限公司 | Anti-theft suspension support of cable |
-
1986
- 1986-12-23 CN CN 86210522 patent/CN86210522U/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102575970A (en) * | 2009-09-25 | 2012-07-11 | 伊斯曼柯达公司 | Thermal Sensors for Flexible Waveguides |
| CN105591329A (en) * | 2014-10-23 | 2016-05-18 | 无锡市金力电力成套设备有限公司 | Pressure detection-type cable clamping hanging frame |
| CN105591332A (en) * | 2014-10-24 | 2016-05-18 | 无锡市金力电力成套设备有限公司 | Anti-theft suspension support of cable |
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| CF01 | Termination of patent right due to non-payment of annual fee |