CN205281691U - Two -wire system instrument burglar alarm - Google Patents
Two -wire system instrument burglar alarm Download PDFInfo
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- CN205281691U CN205281691U CN201520765834.1U CN201520765834U CN205281691U CN 205281691 U CN205281691 U CN 205281691U CN 201520765834 U CN201520765834 U CN 201520765834U CN 205281691 U CN205281691 U CN 205281691U
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Abstract
The utility model relates to a two -wire system instrument burglar alarm, a serial communication port, the alarm includes the instrument case, the two -wire system instrument is connected to the instrument case, the instrument case is inside is provided with terminal row, two -wire system instrument cable positive pole and two -wire system instrument cable negative pole, two -wire system instrument cable is anodal to be provided with the circuit module with two -wire system instrument cable negative pole. Whole technical scheme design benefit, compact structure when the personnel of stealing implement larceny, must detach or cut instrument cable circuit, causes cable circuit to open circuit or the short circuit, this kind of state that the alarm can detect in the twinkling of an eye to send acousto -optic warning. When the theft personnel prized alarm instrument case door, the threshold position can be moved, can trigger the warning equally, and high -decibel warning sound forms the thief and intimidates, forced it to end larceny. Also through this kind of specific audible alarm information, inform personnel on every side simultaneously.
Description
Technical field
The utility model relates to a kind of warning howler, is specifically related to a kind of two wire system instrument burglar alarm, belongs to instrumentation monitoring anti-theft field.
Background technology
In the automation control system of domestic each smelter; two wire system instrument is used widely owing to signal immunity from interference is strong, save cable usage quantity; and it is especially big with the metrical instrument usage quantity such as pressure, differential pressure; it is little that such instrument that each major company produces has volume; weight is light; it is convenient to carry; dismounting is simple; price is high; the features such as highly versatile, therefore, scene often there will be the robbed or burgled phenomenon of instrument; theft process is generally all shorter than 10 minutes, crime instrument only one common wrench, scissors. At present, it does not have good way is antitheft, can only be welded together by band iron and platform, railing etc. by it, strengthen theft difficulty, but exist and safeguard that replacing takes time and effort, very troublesome problem. The excessive problem of cost of investment is there is again by installing video monitoring system.
Practical novel content
In order to solve above-mentioned Problems existing, the utility model discloses a kind of two wire system instrument burglar alarm, the directly circuit of series connection access two wire system instrument, and two wire system instrument can not be introduced signal disturbing, two wire system instrument burglar alarm is arranged near two wire system instrument, it is generally within the scope of 5-10 rice, if someone implements larceny, first, cable must be removed, cut tear two wire system instrument cable open time, warning howler will detect cable short circuit or open circuit automatically, send up to 100 decibels of sound and light alarms simultaneously, spread scope is wide, the attention of other staff can be caused, stealer can be formed again and intimidate, it is forced to stop larceny.
In order to realize above-mentioned purpose, the technical solution of the utility model is as follows, a kind of two wire system instrument burglar alarm, it is characterized in that, described warning howler comprises instrument case, described instrument case connect two wire system instrument, described instrument case inside be provided with terminal block, two wire system instrument cable positive pole and two wire system instrument cable negative pole, described two wire system instrument cable positive pole and two wire system instrument cable negative pole are provided with circuit module.
Improve as one of the present utility model, described circuit module comprises instrument case door limit circuit, over-current detection circuit, broken circuit detection circuit, relay1 circuit, rly. triggering circuit, rly. discharge loop, acoustic-optic alarm circuit, signal is delivered to acoustic-optic alarm circuit by rly. triggering circuit, relay1 circuit by described over-current detection circuit, and signal is delivered to acoustic-optic alarm circuit by instrument case door limit circuit.
Improving as one of the present utility model, described relay1 circuit comprises three grades of pipe Q1, resistance R3 and optocoupler U1, three grades of pipe Q1 and resistance R3, plays the effect of protection optocoupler U1. Increasing to a certain degree when flowing through R3 electric current, three grades of pipe Q1 open, and are shunted by the electric current entering R3, thus prevent the electric current flowing through optocoupler U1 excessive and damage optocoupler.
Improving as one of the present utility model, described over-current detection circuit is made up of R1 resettable fuse. When electric current is less than 30mA, resistance is close to zero, and when electric current is greater than 30mA, resistance increases rapidly, increases to infinity instantaneously, plays the object cutting off circuit electric current. Therefore, play the object of over-current detection.
Improving as one of the present utility model, described broken circuit detection circuit is made up of three grades of pipe Q1. Three grades of pipe Q1 mainly play the object of outage detection, and normal loop current is at more than 4mA, and when circuit loop disconnects, three grades of pipe dead electricity, secondary contact are opened.
Improving as one of the present utility model, described acoustic-optic alarm circuit is often made war by rly. U2 secondary contact, three grades of pipe Q2, thresholding position K1 and electric bell S1 form.
Improving as one of the present utility model, described rly. triggering circuit are made up of R1 and rly. U2 coils from parallel connection of coils. R1 and rly. U2 coils from parallel connection of coils, when the electric current flowing through R1 is less than 30mA, owing to R1 resistance is very little, so R1 voltage is very little, therefore relay1 coil does not work owing to both end voltage is low, when R1 electric current increases, resistance sharply increases, being equivalent to R1 open circuit, therefore relay1 coil obtains electric work, plays the object of trigger relay work.
Improving as one of the present utility model, described rly. discharge loop is made up of diode D1 and rly. U2. Diode D1, is connected in parallel on the two ends of relay1 coil, and when mainly completing rly. U2 power-off, loop electric discharge work, is used for protecting relay1 coil.
Improving as one of the present utility model, described instrument case door limit circuit is spacing for hitting bar, and when instrument case door is closed, the spacing bar that hits is pressed into, and spacing loop disconnects, and when instrument case door is opened, the spacing bar that hits ejects, spacing circuit closed.
Relative to prior art, advantage of the present utility model is as follows, 1) whole Technical Design is ingenious, compact construction, when pilferage personnel implement larceny, must dismantle or cut off instrument cable loop, cause cable loop open circuit or short circuit, this kind of state that warning howler can detect instantaneously, and send sound and light alarm. When theft personnel prize warning howler instrument case door, the meeting action of thresholding position, can trigger warning equally, and thief is formed and intimidates by high-decibel warning sound, forces it to stop larceny. Simultaneously also by this kind of specific sound alarm message, inform the personnel of surrounding; 2) this technical scheme is directly connected on two wire system instrument circuit, does not increase circuit power consumption under non-alarm condition, it is not necessary to extra power taking, payout; 3) this technical scheme volume is little, and cost is low, convenient enforcement; 4) thief is formed deterrence by this technical scheme, forces it to abandon theft; 5) this technical scheme master control room long-range can know the stolen position of two wire system instrument, takes measures on customs clearance in time.
Accompanying drawing explanation
Fig. 1 is two wire system instrument burglar alarm one-piece construction schematic diagram;
Fig. 2 is Fig. 1 schematic circuit diagram;
In figure: 1 two wire system instrument cable positive pole, 2 over-current detection circuits, 3 rly. triggering circuit, 4 relay1 circuits, 5 acoustic-optic alarm circuit, 6 instrument case door limit circuits, 7 rly. discharge loops, 8 broken circuit detection circuits, 9 two wire system instrument cable negative poles, 10 terminal block, 11 two wire system instrument, 12 instrument cases.
Embodiment
In order to deepen understanding of the present utility model and understanding, below in conjunction with the drawings and specific embodiments, illustrate the utility model further.
Embodiment 1:
A kind of two wire system instrument burglar alarm, described warning howler comprises instrument case 12, described instrument case connects two wire system instrument 11, described instrument case inside be provided with terminal block, two wire system instrument cable positive pole and two wire system instrument cable negative pole, described two wire system instrument cable positive pole and two wire system instrument cable negative pole are provided with circuit module, described circuit module comprises instrument case door limit circuit 6, over-current detection circuit 2, broken circuit detection circuit 8, relay1 circuit 4, rly. triggering circuit 3, rly. discharge loop 7, acoustic-optic alarm circuit 5, described over-current detection circuit 2 is by rly. triggering circuit 3, signal is delivered to acoustic-optic alarm circuit 5 by relay1 circuit 4, signal is delivered to acoustic-optic alarm circuit 5 by instrument case door limit circuit 6, signal is delivered to rly. triggering circuit 3 by described broken circuit detection circuit 8, .
Embodiment 2:Improving as one of the present utility model, described relay1 circuit 4 comprises three grades of pipe Q1, resistance R3 and optocoupler U1, three grades of pipe Q1 and resistance R3, plays the effect of protection optocoupler U1. Increasing to a certain degree when flowing through R3 electric current, three grades of pipe Q1 open, and are shunted by the electric current entering R3, thus prevent the electric current flowing through optocoupler U1 excessive and damage optocoupler; Described over-current detection circuit 2 is made up of R1 resettable fuse. When electric current is less than 30mA, resistance is close to zero, and when electric current is greater than 30mA, resistance increases rapidly, increases to infinity instantaneously, plays the object cutting off circuit electric current. Therefore, play the object of over-current detection. Described broken circuit detection circuit 8 is made up of three grades of pipe Q1. Three grades of pipe Q1 mainly play the object of outage detection, and normal loop current is at more than 4mA, and when circuit loop disconnects, three grades of pipe dead electricity, secondary contact are opened. Described acoustic-optic alarm circuit 5 is often made war by rly. U2 secondary contact, three grades of pipe Q2, thresholding position K1 and electric bell S1 form. Described rly. triggering circuit 3 are made up of R1 and rly. U2 coils from parallel connection of coils. R1 and rly. U2 coils from parallel connection of coils, when the electric current flowing through R1 is less than 30mA, owing to R1 resistance is very little, so R1 voltage is very little, therefore relay1 coil does not work owing to both end voltage is low, when R1 electric current increases, resistance sharply increases, being equivalent to R1 open circuit, therefore relay1 coil obtains electric work, plays the object of trigger relay work. Described rly. discharge loop 7 is made up of diode D1 and rly. U2. Diode D1, is connected in parallel on the two ends of relay1 coil, and when mainly completing rly. U2 power-off, loop electric discharge work, is used for protecting relay1 coil; Described instrument case door limit circuit 6 is spacing for hitting bar, and when instrument case door is closed, the spacing bar that hits is pressed into, and spacing loop disconnects, and when instrument case door is opened, the spacing bar that hits ejects, spacing circuit closed.
In this technical scheme, over-current detection circuit, broken circuit detection circuit are the cores of this warning howler, cable state can either accurately be detected, can not be impacted in original signal loop again, introduce interference, it is possible to ensure that the stable of instrument measurement is with accurately. This patent completes over-current detection and break monitoring by core components such as the safety fuse that certainly resets of specific currents, optocoupler, triode, adjustable resistors, ensure that the maximum 2V(two wire system instrument general requirement service voltage that is no more than of whole circuit pressure drop (within the scope of 4-20mA) is within the scope of 15VDC-24VDC, PLC simulates module for power supply 24VDC, when maximum pressure drop 2VDV, also surplus 22VDC, two wire system instrument power supply requirement can be met completely), avoid signal disturbing by light-coupled isolation simultaneously. Over-current detection loop can ensure that loop current is under cable short-circuit conditions simultaneously, by current control within 50mA, avoids because of the short circuit of whole loop, power supply switch (general 2A) tripping operation in PLC rack so that warning howler cannot work. Under normal circumstances, the watt consumption of measuring circuit is with original the same, that is: 24VDC* loop current value (4-20mA), can not bring excessive power drain.
Alarm apparatus adopts two wire system instrument power to power, and under non-alarm condition, loop disconnects, inactivity consumes, and under alarm condition, work maximum current is no more than 100mA, sound higher than 100 decibels, be avoid theft thief destroy burglar alarm, increase warning howler thresholding position chain. Two wire system meter status summary view is increased at HMI computer picture, way comprises each two wire system instrument position number and position is installed, under standard state, the display of meter status pilot lamp is green, when instrument is stolen, in picture, the flicker of corresponding instrument position number, sends warning sound by host sound, alert simultaneously. The judgement of meter status mainly judges according to the instrument signal read, and when its value is in 4-20mA, meter status is normal, and when loop current is zero or electric current is greater than 22mA, meter status is abnormal.
Concrete installation requirement:
Wiring requires: the cable originally directly connecing two wire system instrument is entered burglar alarm, access respective terminal. Burglar alarm outlet connects two wire system instrument.
Status requirement installed by burglar alarm:
1, general two wire system instrument cable out arrives near instrument place of erection through penetration pipe from cable testing bridge, and penetration pipe outlet distance instrument mounting points, within 5 meters, in this case, is directly arranged on penetration pipe outlet burglar alarm upper fixing. Ensure that penetration pipe outlet is inner at instrument case, ensure penetration pipe cable completely inner at instrument case to instrument case inlet wire cable, cannot cut off from outside. Instrument case door key is locked.
2, the cable having is directly from crane span structure out, there is no penetration pipe, in this case, directly burglar alarm is arranged on the eminence that ordinary person is not easy enough to arrive, or warning howler is as far as possible near crane span structure installation, will ensure that being not easy person thefted into warning howler inlet wire cable cuts off easily. Instrument case door key is locked.
Principle of work is as follows:
Electric current flowing through channel is under normal circumstances: PLC positive pole flows out, through the normally closed point of rly. U2, through R1(resettable fuse, when electric current is lower than 30mA, resistance is zero), very little through R3(resistance), through optocoupler U1, flow into two wire system instrument positive pole, flow out from negative pole and return to PLC negative pole. Whole loop current is regulated automatically by two wire system instrument, and scope is 4 20mA. Optocoupler Q1 obtains electric, and auxiliary point closes, and causes the lower end ground connection of resistance R2, and three grades of pipe Q2 end. Relay1 coil must not be electric, secondary contact, and normally closed point closes, and normal battle is opened, and instrument case thresholding position K1 opens, and electric bell S1 loop does not close. Instrument normal operation.
Stolen situation divides three kinds:
The first: two wire system instrument wiring is destroyed, when causing cable short circuit: whole loop voltage is 24VDC, and owing to two wire system instrument is shorted, namely the instrument positive pole in upper figure and instrument negative pole are shorted together. Due to R1, the resistance of R3 and optocoupler is very little, so causing circuit electric current to increase fast, when electric current is increased to more than 30mA, R1 sharply increases with electric current increase, cause the electric current flowing through R1 close to zero, therefore, electric current flowing through channel is: PLC positive pole flows out, through relay1 coil through R3, through optocoupler, the instrument positive and negative electrode through short circuit returns to PLC negative pole. Owing to rly. U2 obtains electric, therefore, normally closed point is opened, and normal battle closes, and as seen from the figure, R1 inlet wire is disconnected, and electric bell S1 loop is connected, and sends warning sound.
2nd kind: two wire system instrument wiring is destroyed, and when causing cable to open a way, loop under normal circumstances is disconnected, and electric current is zero. Optocoupler U1 is due to dead electricity, and secondary contact disconnection, 24VDC powers to three grades of pipe base stages through resistance R2, causes Q2 conducting, and electric current flowing through channel is: PLC positive pole, through electric bell S1, through Q2, returns to PLC negative pole, and electric bell loop is connected, and sends warning sound.
The third: instrument case is prized, and now, thresholding position is pried open due to door, and turns into normally off from normal open state, current circuit: PLC positive pole, through electric bell S1, through thresholding position K1, returns to PLC negative pole.
It should be noted that; above-described embodiment is only better embodiment of the present utility model; it is not used for limiting protection domain of the present utility model, the equivalent replacement made on the basis of technique scheme or replacement, all belongs to protection domain of the present utility model.
Claims (8)
1. a two wire system instrument burglar alarm, it is characterized in that, described warning howler comprises instrument case, described instrument case connects two wire system instrument, described instrument case inside be provided with terminal block, two wire system instrument cable positive pole and two wire system instrument cable negative pole, described two wire system instrument cable positive pole and two wire system instrument cable negative pole are provided with circuit module.
2. two wire system instrument burglar alarm according to claim 1, it is characterized in that, described circuit module comprises instrument case door limit circuit, over-current detection circuit, broken circuit detection circuit, relay1 circuit, rly. triggering circuit, rly. discharge loop, acoustic-optic alarm circuit, signal is delivered to acoustic-optic alarm circuit by rly. triggering circuit, relay1 circuit by described over-current detection circuit, and signal is delivered to acoustic-optic alarm circuit by instrument case door limit circuit 6.
3. two wire system instrument burglar alarm according to claim 2, it is characterised in that, described relay1 circuit comprises three grades of pipe Q1, resistance R3 and optocoupler U1, three grades of pipe Q1 and resistance R3, plays the effect of protection optocoupler U1.
4. two wire system instrument burglar alarm according to claim 3, it is characterised in that, described over-current detection circuit is made up of R1 resettable fuse.
5. two wire system instrument burglar alarm according to claim 4, it is characterised in that, described broken circuit detection circuit is made up of three grades of pipe Q1.
6. two wire system instrument burglar alarm according to claim 4 or 5, it is characterised in that, described acoustic-optic alarm circuit is often made war by rly. U2 secondary contact, three grades of pipe Q2, thresholding position K1 and electric bell S1 form.
7. two wire system instrument burglar alarm according to claim 6, it is characterised in that, described rly. triggering circuit are made up of R1 and rly. U2 coils from parallel connection of coils.
8. two wire system instrument burglar alarm according to claim 7, it is characterised in that, described rly. discharge loop is made up of diode D1 and rly. U2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520765834.1U CN205281691U (en) | 2015-09-30 | 2015-09-30 | Two -wire system instrument burglar alarm |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520765834.1U CN205281691U (en) | 2015-09-30 | 2015-09-30 | Two -wire system instrument burglar alarm |
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| CN205281691U true CN205281691U (en) | 2016-06-01 |
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| CN201520765834.1U Active CN205281691U (en) | 2015-09-30 | 2015-09-30 | Two -wire system instrument burglar alarm |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109272683A (en) * | 2018-11-22 | 2019-01-25 | 国网宁夏电力有限公司宁东供电公司 | The antitheft single-ended monitoring device of the power cable that do not put into operation |
| CN112904512A (en) * | 2021-03-15 | 2021-06-04 | 汪熙昌 | 5G optical fiber distribution box and use method thereof |
-
2015
- 2015-09-30 CN CN201520765834.1U patent/CN205281691U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109272683A (en) * | 2018-11-22 | 2019-01-25 | 国网宁夏电力有限公司宁东供电公司 | The antitheft single-ended monitoring device of the power cable that do not put into operation |
| CN109272683B (en) * | 2018-11-22 | 2024-03-22 | 国网宁夏电力有限公司宁东供电公司 | Anti-theft single-end monitoring device for power cable without operation |
| CN112904512A (en) * | 2021-03-15 | 2021-06-04 | 汪熙昌 | 5G optical fiber distribution box and use method thereof |
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