A kind of foundry holding wire noise trapTechnical field
This utility model relates to signal Anti-Jamming Technique field, more specifically, it relates to a kind of foundry signalLine noise trap.
Background technology
In foundry, generally require and the liquid steel temperature in smelting furnace is detected, in order to clearly illustrate molten steelTemperature, usually installs temperature display in foundry and shows the temperature of molten steel in real time.Due to electricity in foundryMagnetic environment is complicated, and containing many charged metal dust in air, easily transmits signal in holding wire and produce bigger shadowRing, cause temperature display cannot demonstrate temperature normally, even lose temperature signal.To this end, existing solutionBeing coated with layer of metal net often on the outer wall of holding wire, the project that signal is easily produced interference by electrostatic etc. is shieldedCover.But, from the point of view of the effect of reality application, list improves also insufficient for holding wire from the structure of holding wire itselfSignal transmission is not affected by electromagnetic radiation, accordingly, it would be desirable to improve existing signal transmitting apparatus.
Utility model content
The problem being vulnerable to interference for foundry in practice with the transmission of holding wire restricting the number, the utility model proposesA kind of foundry holding wire noise trap, concrete scheme is as follows:
A kind of foundry holding wire noise trap, including:
Detector unit, in order to the amplitude size of signal in signal lines and export an amplitude detection signal, if it exceedesPreset value, then output one triggering signal；
Signal transmission unit, including wired signal transmission module and wireless signal transmission module, during original state, wiredSignal transmission module and wireless signal transmission module one of them communicate to connect with signal source, receive and transmit signal；
Switch unit, including at least one electric-controlled switch element, in response to described triggering signal, selectivity Continuity signal sourceWith wire signal transport module or wireless signal transmission module.
Owing to the temperature display in foundry is in the state worked always, therefore, at the signal in holding wireWhen normal condition, the signal voltage in holding wire should be maintained within the scope of certain, is interfered when signal and interruptsOr when increasing suddenly, detector unit will detect that above-mentioned change, and the mode that at this moment signal is just transmitted by switch unit is by havingThe transmission means of line switches to wirelessly to be transmitted, or contrary with said process.Ensure that quality and company that signal transmitsContinuous property, the interference free performance of promotion signal line.
Further, described detector unit includes:
Voltage sensor, electrically connects with described holding wire, in order to the amplitude size of signal in signal lines and export instituteState amplitude detection signal；
Upper limit module, including first liang of input comparator, its positive and negative input is respectively coupled to described detector unitAmplitude detection signal, and one first reference voltage signal, export a upper limit comparison signal；
Lower limit module, including second liang of input comparator, its positive and negative input is respectively coupled to one second reference voltageSignal, and the amplitude detection signal of described detector unit, export a lower limit comparison signal；
Scope determination module, including one or two input or door, its signal input part is respectively coupled to described upper limit and compares letterNumber with lower limit comparison signal, export described triggering signal.
By technique scheme, voltage sensor can detect the amplitude size of the signal voltage in holding wire, andAnd output is to upper limit module and lower limit module, once the amplitude range of signal exceedes the most spacing predetermined value, then firstTwo input comparators or second liang of input comparator will export a high level, by arranging or door, when first liang of input is comparedDevice, second liang of input comparator wherein have an output high level, then can be determined that out abnormal signal over range, then output is describedTrigger signal.
Further, described wireless signal transmission module includes: WIFI wireless signal transmission module or GPRS communication moduleOr bluetooth communication.
Pass through technique scheme so that stablizing of the signal transmission variation in foundry, beneficially signal transmissionProperty.
Further, described switch unit includes:
One metal-oxide-semiconductor, the grid of described metal-oxide-semiconductor is coupled to described triggering signal, and its source electrode is coupled to signal source, and drain electrode couplesIn described wireless signal transmission module or the signal input part of wire signal transport module；
One diode, its negative pole is coupled between described signal source and metal-oxide-semiconductor, and positive pole is coupled to the transmission of described wire signalModule or the signal input part of wireless signal transmission module.
By technique scheme, when signal voltage is in normal condition, metal-oxide-semiconductor is in the conduction state, once signalOccurring abnormal, trigger signal and drive MOS to block, now the voltage of signal source is all loaded onto the two ends of metal-oxide-semiconductor or diode, onlyWill the conducting voltage of now diode reasonable, then will be reversed and puncture so that signal is through another transmission means of diode selectingIt is transmitted, thus becomes and ensure that the seriality that signal transmits, it is to avoid temperature display shows mistake due to the interference of signal.
Further, described switch unit includes:
One not gate, its signal input part is coupled to described triggering signal；
One first metal-oxide-semiconductor, the grid of described first metal-oxide-semiconductor is coupled to the signal output part of described not gate, a described MOSThe source electrode of pipe is coupled to signal source, and the signal that drain electrode is coupled to described wireless signal transmission module or wire signal transport module is defeatedEnter end；
One second metal-oxide-semiconductor, the grid of described second metal-oxide-semiconductor is coupled to described triggering signal, and its source electrode is coupled to described letterNumber source, drain electrode is coupled to described wire signal transport module or the signal input part of wireless signal transmission module.
By technique scheme, when signal voltage is in normal condition, triggers signal and do not export, at the first metal-oxide-semiconductorIn conducting state, now signal is transmitted by the mode of wire transmission, and when signal transmission occurs abnormal, triggers signal defeatedGo out, turn on the second metal-oxide-semiconductor, so that signal behavior another way is transmitted, it is ensured that the stability of signal transmission and companyContinuous property.
Further, it is provided with an electric capacity between described second metal-oxide-semiconductor and the triggering signal output part of described detector unit.
Due to metal-oxide-semiconductor response speed quickly, and the output of not gate is relatively slow comparatively speaking, thus there will be in the short timeThe possibility of two signal line simultaneous transmission of signals, in order to offset the delay effect of not gate self, arranges electricity before the second metal-oxide-semiconductorHolding, the equivalent capacity of the size NAND gate of electric capacity self is suitable, it is possible to ensures that signal synchronization is only transmitted by a kind of mode, keeps awayExempt to interfere.
Further, after the signal output part of described scope determination module, it is additionally provided with delay confirmation module, including:
One delay circuit, receives described triggering signal, exports a triggering signal to be confirmed after delay predetermined time；
One or two input and door, its signal input part is respectively coupled to described triggering signal to be confirmed and triggers signal, outputOne confirms to trigger signal.
By arranging delay confirmation circuit, that can effectively get rid of that the signal voltage saltus step in the short time brought is dryDisturbing, when only the exception of long period occurs in signal voltage, just output triggers signal.
Further, described detector unit also includes:
One reference voltage generation module, including multiple resistance being arranged in series, described first reference voltage and the second benchmarkVoltage is picked out by between adjacent two resistance.
Further, described first metal-oxide-semiconductor and the second metal-oxide-semiconductor are NMOS tube.
Compared with prior art, this utility model is by tying wire signal transmission means mutually with transmission of wireless signals modeConjunction, when one way in which occurs abnormal, changes transmission means in time, it is ensured that the stability of signal transmission is with continuousProperty so that the signal transmission in foundry is more stable.
Accompanying drawing explanation
Fig. 1 is general frame schematic diagram of the present utility model；
Fig. 2 is the overall schematic of this utility model embodiment one；
Fig. 3 is the overall schematic of this utility model embodiment two.
Accompanying drawing mark: 1, detector unit；2, signal transmission unit；3, switch unit；11, voltage sensor；12, upper limitModule；13, lower limit module；14, scope determination module；21, wire signal transport module；22, wireless signal transmission module；4、Delay confirmation module；15, reference voltage generation module；5, temperature display；6, wireless thermodetector；7, monitor terminal.
Detailed description of the invention
The problem that this utility model is vulnerable to interference for foundry with the transmission of holding wire restricting the number, it is proposed that a kind of castingWorkshop holding wire noise trap.
Below in conjunction with embodiment and figure, the utility model is described in further detail, but embodiment party of the present utility modelFormula is not limited only to this.
Embodiment one: as depicted in figs. 1 and 2, a kind of foundry holding wire noise trap, including:
Detector unit 1, in order to the amplitude size of signal in signal lines and export an amplitude detection signal, if it exceedesPreset value, then output one triggering signal；
Signal transmission unit 2, including wired signal transmission module 21 and wireless signal transmission module 22, original stateTime, wire signal transport module 21 and wireless signal transmission module 22 one of them communicate to connect with signal source, receive and transmitSignal；
Switch unit 3, including at least one electric-controlled switch element, in response to triggering signal, selectivity Continuity signal source withWire signal transport module 21 or wireless signal transmission module 22.
In such scheme, the detecting element of detector unit 1 uses voltage sensor 11, voltage sensor 11 and holding wire electricityConnect, detect signal in order to amplitude size the output amplitude of signal in signal lines.Detector unit 1 also includes:
Upper limit module 12, including first liang of input comparator A1, its positive and negative input is respectively coupled to detector unit 1Amplitude detection signal, and one first reference voltage signal, export a upper limit comparison signal；
Lower limit module 13, including second liang of input comparator A2, its positive and negative input is respectively coupled to one second benchmarkVoltage signal, and the amplitude detection signal of detector unit 1, export a lower limit comparison signal；
Scope determination module 14, including one or two input or door OR, its signal input part is respectively coupled to upper limit and compares letterNumber with lower limit comparison signal, output trigger signal.
In above-mentioned detector unit 1, voltage sensor 11 can detect the amplitude size of the signal voltage in holding wire, andAnd output is to upper limit module 12 and lower limit module 13, once the amplitude range of signal exceedes the most spacing predetermined value, thenFirst liang of input comparator A1 or second liang of input comparator A2 will export a high level, by arranging or door OR, when firstTwo input comparator A1, second liang of input comparator A2 wherein have an output high level, then can be determined that out that abnormal signal surpassesScope, then output triggers signal.
In the present embodiment, for the first reference voltage signal and the second reference voltage signal, can directly be carried by program controlSupplying, it is also possible to provided by hardware circuit dividing potential drop, preferably hardware dividing potential drop provides.Preferably, detector unit 1 also includes: a benchmarkVoltage generation module 15, including multiple resistance being arranged in series, the first reference voltage and the second reference voltage by adjacent two electricityPick out between resistance.It is the most simpler that the method compares to the method for program control offer, principle and realization, and work is the most stable.
Being described in further detail, wireless signal transmission module 22 includes: WIFI wireless signal transmission module 22 or GPRS communicatesModule or bluetooth communication.In technique scheme, can believe according to receiving terminal is selected with the distance of foundry's collection terminalNumber transmission means so that in foundry signal transmission variation, beneficially signal transmission stability.
Describing in detail, switch unit 3 includes:
One metal-oxide-semiconductor Q, the grid of metal-oxide-semiconductor Q is coupled to trigger signal, and its source electrode is coupled to signal source, and drain electrode is coupled to wirelessSignal transmission module 22 or the signal input part of wire signal transport module 21；
One diode D1, its negative pole is coupled between signal source and metal-oxide-semiconductor Q, and positive pole is coupled to wire signal transport module21 or the signal input part of wireless signal transmission module 22.
When signal voltage is in normal condition, metal-oxide-semiconductor Q is in the conduction state, and once signal occurs abnormal, triggers signalDriving MOS to block, now the voltage of signal source is all loaded onto metal-oxide-semiconductor Q or the two ends of diode D1, if now diode D1Conducting voltage reasonable, then will be reversed and puncture so that signal selects another transmission means to be transmitted through diode D1, byThis change ensure that the seriality that signal transmits, it is to avoid temperature display shows mistake due to the interference of signal.
For the scheme of embodiment one, owing to the temperature display in foundry is in the state worked always, therefore,When the signal in holding wire is in normal condition, the signal voltage in holding wire should be maintained within the scope of certain, whenWhen signal is interfered and interrupts or increase suddenly, detector unit 1 will detect that above-mentioned change, and at this moment switch unit 3 is justThe mode transmitted by signal is switched to by wired transmission means and wirelessly transmits, or contrary with said process.EnsureThe quality of signal transmission and seriality, the interference free performance of promotion signal line.
Embodiment two, as shown in figures 1 and 3, a kind of foundry holding wire noise trap, with the district of embodiment oneIt is not: switch unit 3 includes:
One not gate NOT, its signal input part is coupled to trigger signal；
The grid of one first metal-oxide-semiconductor Q1, the first metal-oxide-semiconductor Q1 is coupled to the signal output part of not gate NOT, the first metal-oxide-semiconductor Q1Source electrode be coupled to signal source, drain electrode is coupled to the signal input of wireless signal transmission module 22 or wire signal transport module 21End；
One second metal-oxide-semiconductor Q2, the grid of the second metal-oxide-semiconductor Q2 is coupled to trigger signal, and its source electrode is coupled to signal source, drain electrodeIt is coupled to wire signal transport module 21 or the signal input part of wireless signal transmission module 22.
Technique scheme, when signal voltage is in normal condition, triggers signal and does not exports, and the first metal-oxide-semiconductor Q1 is inConducting state, now signal is transmitted by the mode of wire transmission, and when signal transmission occurs abnormal, triggers signal defeatedGo out, turn on the second metal-oxide-semiconductor Q2, so that signal behavior another way is transmitted, it is ensured that signal transmission stability withSeriality.
Further, it is provided with an electric capacity between the second metal-oxide-semiconductor Q2 and the triggering signal output part of detector unit 1.
Due to metal-oxide-semiconductor response speed quickly, and the output of not gate NOT is relatively slow comparatively speaking, thus there will be in short-termThe possibility of interior two signal line simultaneous transmission of signals, in order to offset the delay effect of not gate NOT self, at the second metal-oxide-semiconductor Q2Before electric capacity is set, the equivalent capacity of size NAND gate NOT of electric capacity self is suitable, it is possible to ensure that signal synchronization is only by oneMode is transmitted, it is to avoid interfere.
For embodiment one and embodiment two, in order to reduce the error of detection, the signal output part of scope determination module 14It is additionally provided with delay confirmation module 4 afterwards, including:
One delay circuit, receives and triggers signal, exports a triggering signal to be confirmed after delay predetermined time；
One or two input and door, its signal input part is respectively coupled to triggering signal to be confirmed and triggers signal, and output one is trueRecognize triggering signal.
Delay confirmation circuit can use simple delay circuit in embodiment one and embodiment two, such as 555 time delay electricityRoad realizes, and the time of time delay measures according to concrete demand.By arranging delay confirmation circuit, can effectively get rid of the short timeWhen the exception of long period occur in the interference that interior signal voltage saltus step is brought, only signal voltage, just output triggers signal.
Being described in further detail, the first metal-oxide-semiconductor Q1 and the second metal-oxide-semiconductor Q2 is NMOS tube.
The above is only preferred implementation of the present utility model, and protection domain of the present utility model is not limited merely toAbove-described embodiment, all technical schemes belonged under this utility model thinking belong to protection domain of the present utility model.Should refer toGo out, for those skilled in the art, without departing from the some improvement under this utility model principle premise andRetouching, these improvements and modifications also should be regarded as protection domain of the present utility model.