CN104122827A - Physical protection linkage circuit - Google Patents
Physical protection linkage circuit Download PDFInfo
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- CN104122827A CN104122827A CN201410386056.5A CN201410386056A CN104122827A CN 104122827 A CN104122827 A CN 104122827A CN 201410386056 A CN201410386056 A CN 201410386056A CN 104122827 A CN104122827 A CN 104122827A
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Abstract
The invention discloses a physical protection linkage circuit, and relates to a physical protection circuit, consisting of an infrared transmitting tube, an infrared receiving tube, a signal transmission interface, NOT gates, an isolating diode, a feedback resistor, a button switch, a driving resistor, a triode, a clamping diode, a relay and a linkage output interface, wherein the anode of the infrared receiving tube is connected to the input end of the NOT gate a through the signal interface, the output end of the NOT gate a is connected to the input end of the NOT gate b and the first pin of the feedback resistor through the isolating diode, the output end of the NOT gate b is connected to the output end of the button switch and the input end of a NOT gate c through an isolating resistor, the output end of the NOT gate c is connected to the second pin of the feedback resistor and also connected to the base of the triode through the driving resistor, and the collector of the triode is connected to the anode of the clamping diode and the coil output end of the relay. When people enter a dangerous area to work, the physical protection linkage circuit provided by the invention automatically prevents equipment from starting, and thereby protecting personal safety of operators.
Description
Technical field
The present invention relates to electronic circuit, specially refer to a kind of personal safety circuit.
Background technology
People are when having the region operation that threatens personal safety, need there is safeguard measure, when the factor that threatens personal safety is during from plant equipment, common safeguard measure is that infrared ray cuts off shutdown and manually power-off shutdown, wherein, it is to utilize human body to be isolated between infrared emission tube and receiving tube that infrared ray cuts off shutdown, make receiving tube not receive infrared signal and make equipment downtime, but operating personnel are when body departs from the linear extent between infrared emission tube and receiving tube in the course of the work, equipment can cause personnel to be clamped and casualty accident occurs by accidental activation, or receiving tube is subject to that light disturbs and misoperation makes equipment accidental activation and have an accident, this type of accident often has generation, operative employee, repeat for a long time same action, or work fatigue and do not carry out manual power-off, also often cause equipment accidental activation and have an accident.
Summary of the invention
The object of this invention is to provide the chain circuit of a kind of personnel protection, chain in the control circuit of main process equipment, when all or part of of human body enters into hazardous location operation, prevention equipment starting automatically, protection operating personnel's personal safety.
The chain circuit of a kind of personnel protection of the present invention, it is characterized in that circuit is by power interface, rectifier transformer (TC), rectification integrated package (IC1), filter capacitor a(C1), regulator block (IC2), filter capacitor b(C2), infrared emission tube, infrared receiver tube, current-limiting resistance (R1), signal transmission interface, not gate a(IC3), isolating diode (V1), not gate b(IC4), feedback resistance (R4), isolation resistance (R3), pushbutton switch (SB), not gate c(IC5), drive resistance (R5), triode (VT), clamp diode (V2), relay and chain output interface form, wherein, power interface comprises power interface a(I) and power interface b(II), rectifier transformer (TC) comprises primary coil and secondary coil, and primary coil has line end a(1) and line end b(2) pick out, secondary coil has line end c(3) and line end d(4) pick out, infrared emission tube and infrared receiver tube pairing are used, signal transmission interface comprises feeding interface (III), signaling interface (IV) and circuit interface (V), relay pack vinculum circle (K) and contact switch (Ka), chain output interface comprises chain interface a(VI) and chain interface b(VII), power interface a(I) and power interface b(II) be connected respectively to the line end a(1 of rectifier transformer (TC)) and line end b(2), the line end c(3 of rectifier transformer (TC)) and line end d(4) be connected respectively to two input ends of rectification integrated package (IC1), the positive pole of rectification integrated package (IC1) is connected to filter capacitor a(C1) positive pole and the input end of regulator block (IC2), the output terminal of regulator block (IC2) and filter capacitor b(C2) positive pole form working power (V+) after being connected, the negative pole of rectification integrated package (IC1) and filter capacitor a(C1) negative pole, the earth terminal of regulator block (IC2) and filter capacitor b(C2) negative pole form ground wire after being connected, working power (V+) is connected to the anode of infrared emission tube and the negative electrode of infrared receiver tube by feeding interface (III), the negative electrode of infrared emission tube is connected to the first pin of current-limiting resistance (R1) by circuit interface (V), the crus secunda of current-limiting resistance (R1) is connected to ground wire, the anode of infrared receiver tube is connected to not gate a(IC3 by signaling interface (IV)) input end, not gate a(IC3) output terminal is connected to the anode of isolating diode (V1), the negative electrode of isolating diode (V1) is connected to not gate b(IC4) input end and the first pin of feedback resistance (R4), not gate b(IC4) output terminal is connected to the first pin of isolation resistance (R3), the crus secunda of isolation resistance (R3) is connected to output terminal and the not gate c(IC5 of pushbutton switch (SB)) input end, the input end of pushbutton switch (SB) is connected to working power (V+), not gate c(IC5) output terminal is connected to the crus secunda of feedback resistance (R4) and drives the first pin of resistance (R5), the crus secunda of driving resistance (R5) is connected to the base stage of triode (VT), the emitter of triode (VT) is connected to ground wire, the collector of triode (VT) is connected to the anode of clamp diode (V2) and coil (K) output terminal of relay, coil (K) input end of the negative electrode of clamp diode (V2) and relay is connected to working power (V+), the contact switch of relay (Ka) input end is connected to chain interface a(VI), the contact switch of relay (Ka) output terminal is connected to chain interface b(VII).
In the present invention, at not gate a(IC3) input end and ground wire between have anti-interference condenser (C3) He Bang road resistance (R2), the first pin of the first Jiao Hebang road resistance (R2) of anti-interference condenser (C3) is connected to not gate a(IC3) input end, the crus secunda of the crus secunda He Bang road resistance (R2) of anti-interference condenser (C3) is connected to ground wire; Not gate a(IC3), not gate b(IC4) and not gate c(IC5) share six ungated integrated circuits, three unnecessary non-not gate c(IC5 that are parallel to) on, the power end of six ungated integrated circuits is connected to working power (V+), and the earth terminal of six ungated integrated circuits is connected to ground wire; Infrared emission tube is many, and many infrared emission tubes connect with series system, and the quantity of infrared receiver tube is identical with the quantity of infrared emission tube, and many infrared receiver tubes connect with series system; The switch that the contact switch of relay (Ka) is normally closed contact; Circuit outer is with the phase line (L) of power supply, the zero line (N) of power supply, chain wire a(X1), chain wire b(X2) and opertaing device, on opertaing device, there is chain port, power interface a(I) and power interface b(II) be connected respectively to the phase line (L) of power supply and the zero line (N) of power supply, chain interface a(VI) and chain interface b(VII) respectively by chain wire a(X1) and chain wire b(X2) be connected to the chain port of opertaing device.
In above-mentioned invention, many infrared emission tubes and many infrared receiver tube pairings are used, each entrance in the operation area that easily has an accident needs installation infrared line to pipe, infrared transmitting tube in infrared mutual-tube and infrared receiver tube be the relative both sides that are arranged on porch respectively, the height of installing is apart from ground 0.6-1.2 rice, can block infrared light when operating personnel are come in and gone out one time; Front end at infrared emission tube is installed condenser, and the infrared ray of every infrared emission tube transmitting is concentrated as a branch of, before infrared receiver tube, filter is installed, and makes every infrared receiver tube receive only infrared light, to increase anti-interference.
In above-mentioned invention, the contact switch that the contact switch of relay (Ka) is normally closed type, when the coil no power of relay, contact switch (Ka) closure, when the coil electricity of relay, contact switch (Ka) disconnects.During application, the contact switch of relay (Ka) is connected on by chain output interface and chain wire on the loop of ac contactor coil of opertaing device.During work, the people who is entered operation area once the infrared ray of any direction is blocked, relay in circuit of the present invention is with regard to adhesive, contact switch (Ka) disconnects, the ac contactor coil of opertaing device can not be switched on, thereby stop equipment accidental activation, once relay, with regard to adhesive, contact switch (Ka), disconnect, can keep always, until personnel withdraw from operation area, manually press the button switch (SB), relay just can discharge, it is closed that contact switch (Ka) recovers, and equipment could start, thereby avoids having an accident.Its process is: when in infrared receiver tube one or several is blocked infrared ray, not gate a(IC3) input end is low level, not gate a(IC3) output terminal is high level, not gate a(IC3) high level of output terminal is transported to not gate b(IC4 by isolating diode (V1)) input end, make not gate b(IC4) output terminal and not gate c(IC5) input end be low level, not gate c(IC5) output terminal is reversed to high level, triode (VT) conducting, the coil of relay (K) energising, the contact switch of relay (Ka) disconnects, the ac contactor coil of opertaing device can not be switched on, thereby stop equipment accidental activation, at not gate c(IC5) output terminal while being reversed to high level, high level is transported to not gate b(IC4 by feedback resistance (R4)) input end, make not gate b(IC4) input end keep high level, at this moment, while departing from the linear extent between infrared emission tube and receiving tube as human body, even if input end not gate a(IC3) is high level, not gate a(IC3) output terminal is reversed to low level, because there being the buffer action of isolating diode (V1), not gate a(IC3) low level of output terminal is to not gate b(IC4) input end inoperative, make not gate c(IC5) output terminal remain high level, triode (VT) keeps conducting, the coil of relay (K) keeps energising, the contact switch of relay (Ka) remains open, continue prevention equipment accidental activation, prevent cramping accident.When finishing the work, when operating personnel withdraws from operation area, by operating personnel, manually press the button switch (SB), make not gate c(IC5) input end be high level, not gate c(IC5) output terminal is reversed to low level, triode (VT) cut-off, the coil of relay (K) power-off, it is closed that the contact switch of relay (Ka) recovers, for equipment normal starting ready, at not gate c(IC5) output terminal while being reversed to low level, by the effect of feedback resistance (R4), not gate b(IC4) input end is just low level, not gate b(IC4) output terminal is high level, not gate b(IC4) high level of output terminal is transported to not gate c(IC5 by isolation resistance (R3)) input end, at this moment, even if decontrol pushbutton switch (SB), not gate c(IC5) output terminal still keeps low level, make triode (VT) remain off, the coil of relay (K) keeps power-off, the contact switch of relay (Ka) remains closed, make the operation of equipment energy normal starting.
In above-mentioned invention, the model of selecting of six ungated integrated circuits is the digital integrated circuit of the CMOS of CC40106, and cmos digital integrated circuit is a kind of desirable micropower circuit, strong anti-interference performance, interface circuit is simple, makes the simple circuit of composition, and reliable operation.
The invention has the beneficial effects as follows: the chain circuit of a kind of personnel protection providing, chain in the control circuit of main process equipment, when people enter into hazardous location operation, prevention equipment starting automatically, protection operating personnel's personal safety.Circuit structure of the present invention is succinct, reliable operation.
Accompanying drawing explanation
Accompanying drawing 1 is the chain circuit diagram of a kind of personnel protection of the present invention.
In figure: 1. line end a, 2. line end b, 3. line end c, 4. line end d, I. power interface a, II. power interface b, III. feeding interface, IV. signaling interface, V. circuit interface, VI. chain interface a, VII. chain interface b, R1. current-limiting resistance, R2.Bang road resistance, R3. isolation resistance, R4. feedback resistance, R5. drive resistance, C1. filter capacitor a, C2. filter capacitor b, C3. anti-interference condenser, V1. isolating diode, V2. clamp diode, V3. infrared emission tube a, V4. infrared emission tube b, V5. infrared receiver tube a, V6. infrared receiver tube b, VT. triode, V+. working power, IC1. rectification integrated package, IC2. regulator block, IC3. not gate a, IC4. not gate b, IC5. not gate c, K. the coil of relay, Ka. the contact switch of relay, SB. pushbutton switch, TC. rectifier transformer, FU. fuse, A. need the operation area of protection, L. the phase line of power supply, N. the zero line of power supply, X1. chain wire a, X2. chain wire b.
Embodiment
embodimentin embodiment shown in accompanying drawing 1, the chain circuit of a kind of personnel protection is by power interface, rectifier transformer (TC), rectification integrated package (IC1), filter capacitor a(C1), regulator block (IC2), filter capacitor b(C2), infrared emission tube, infrared receiver tube, current-limiting resistance (R1), signal transmission interface, anti-interference condenser (C3), be close to road resistance (R2), not gate a(IC3), isolating diode (V1), not gate b(IC4), feedback resistance (R4), isolation resistance (R3), pushbutton switch (SB), not gate c(IC5), drive resistance (R5), triode (VT), clamp diode (V2), relay and chain output interface form, wherein, power interface comprises power interface a(I) and power interface b(II), rectifier transformer (TC) comprises primary coil and secondary coil, and primary coil has line end a(1) and line end b(2) pick out, secondary coil has line end c(3) and line end d(4) pick out, infrared emission tube and infrared receiver tube pairing are used, signal transmission interface comprises feeding interface (III), signaling interface (IV) and circuit interface (V), relay pack vinculum circle (K) and contact switch (Ka), chain output interface comprises chain interface a(VI) and chain interface b(VII), power interface a(I) and power interface b(II) be connected respectively to the line end a(1 of rectifier transformer (TC)) and line end b(2), the line end c(3 of rectifier transformer (TC)) and line end d(4) be connected respectively to two input ends of rectification integrated package (IC1), the positive pole of rectification integrated package (IC1) is connected to filter capacitor a(C1) positive pole and the input end of regulator block (IC2), the output terminal of regulator block (IC2) and filter capacitor b(C2) positive pole form working power (V+) after being connected, the negative pole of rectification integrated package (IC1) and filter capacitor a(C1) negative pole, the earth terminal of regulator block (IC2) and filter capacitor b(C2) negative pole form ground wire after being connected, working power (V+) is connected to infrared emission tube a(V3 by feeding interface (III)) anode and infrared receiver tube a(V5) negative electrode, infrared emission tube a(V3) negative electrode is connected to the first pin of current-limiting resistance (R1) by circuit interface (V), the crus secunda of current-limiting resistance (R1) is connected to ground wire, infrared receiver tube a(V5) anode is connected to not gate a(IC3 by signaling interface (IV)) input end, the first pin of the first Jiao Hebang road resistance (R2) of anti-interference condenser (C3), the crus secunda of the crus secunda He Bang road resistance (R2) of anti-interference condenser (C3) is connected to ground wire, not gate a(IC3) output terminal is connected to the anode of isolating diode (V1), the negative electrode of isolating diode (V1) is connected to not gate b(IC4) input end and the first pin of feedback resistance (R4), not gate b(IC4) output terminal is connected to the first pin of isolation resistance (R3), the crus secunda of isolation resistance (R3) is connected to output terminal and the not gate c(IC5 of pushbutton switch (SB)) input end, the input end of pushbutton switch (SB) is connected to working power (V+), not gate c(IC5) output terminal is connected to the crus secunda of feedback resistance (R4) and drives the first pin of resistance (R5), the crus secunda of driving resistance (R5) is connected to the base stage of triode (VT), the emitter of triode (VT) is connected to ground wire, the collector of triode (VT) is connected to the anode of clamp diode (V2) and coil (K) output terminal of relay, coil (K) input end of the negative electrode of clamp diode (V2) and relay is connected to working power (V+), the contact switch of relay (Ka) input end is connected to chain interface a(VI), the contact switch of relay (Ka) output terminal is connected to chain interface b(VII).In the present embodiment, not gate a(IC3), not gate b(IC4) and not gate c(IC5) share six ungated integrated circuits, three unnecessary non-not gate c(IC5 that are parallel to) upper (not shown), the power end of six ungated integrated circuits is connected to working power (V+), the earth terminal of six ungated integrated circuits is connected to ground wire, and the model of selecting of six ungated integrated circuits is the digital integrated circuit of the CMOS of CC40106; Infrared emission tube is many, and many infrared emission tubes connect with series system, and the quantity of infrared receiver tube is identical with the quantity of infrared emission tube, and many infrared receiver tubes connect with series system; The switch that the contact switch of relay (Ka) is normally closed contact; Circuit outer is with the phase line (L) of power supply, the zero line (N) of power supply, chain wire a(X1), chain wire b(X2) and opertaing device, on opertaing device, there is chain port, power interface a(I) and power interface b(II) be connected respectively to the phase line (L) of power supply and the zero line (N) of power supply, chain interface a(VI) and chain interface b(VII) respectively by chain wire a(X1) and chain wire b(X2) be connected to the chain port of opertaing device; The contact switch that the contact switch of relay (Ka) is normally closed type, when the coil no power of relay, contact switch (Ka) closure, when the coil electricity of relay, contact switch (Ka) disconnects.
In the above embodiments, many infrared emission tubes and many infrared receiver tube pairings are used, each entrance in the operation area that easily has an accident needs installation infrared line to pipe, infrared transmitting tube in infrared mutual-tube and infrared receiver tube be the relative both sides that are arranged on porch respectively, the height of installing is apart from ground 0.6-1.2 rice, can block infrared light when operating personnel are come in and gone out one time; Front end at infrared emission tube is installed condenser, and the infrared ray of every infrared emission tube transmitting is concentrated as a branch of, before infrared receiver tube, filter is installed, and makes every infrared receiver tube receive only infrared light, to increase anti-interference.
Vertical parting flaskless shoot-squeeze moulding machine is adopted a kind of cast member moulding machine by numerous casting producer, when the present invention applies on this moulding machine, the contact switch of relay (Ka) is connected on by chain output interface and chain wire on the loop of ac contactor coil of this moulding machine opertaing device.During work, moulder enter into hydraulic pressure module driving machine and the sand mo(u)ld made between clear up and during reinforced work, just have one or several the infrared receiver tubes infrared ray that is blocked, relay in the present embodiment circuit is with regard to adhesive, contact switch (Ka) disconnects, the ac contactor coil that makes starting and move this moulding machine can not be switched on, thereby stop equipment accidental activation, once relay is with regard to adhesive, when contact switch (Ka) disconnects, can keep always, until fulfiling assignment, moulder withdraws from operation area, manually press the button switch (SB), relay just can discharge, it is closed that contact switch (Ka) recovers, equipment could start, thereby avoid having an accident.Its process is: when moulder enter hydraulic pressure module driving machine and the sand mo(u)ld made between clear up and during reinforced work, when in infrared receiver tube one or several is blocked infrared ray, not gate a(IC3) input end is low level, not gate a(IC3) output terminal is high level, not gate a(IC3) high level of output terminal is transported to not gate b(IC4 by isolating diode (V1)) input end, make not gate b(IC4) output terminal and not gate c(IC5) input end be low level, not gate c(IC5) output terminal is reversed to high level, triode (VT) conducting, the coil of relay (K) energising, the contact switch of relay (Ka) disconnects, the ac contactor coil of opertaing device can not be switched on, thereby stop equipment accidental activation, at not gate c(IC5) output terminal while being reversed to high level, high level is transported to not gate b(IC4 by feedback resistance (R4)) input end, make not gate b(IC4) input end keep high level, at this moment, while departing from the linear extent between infrared emission tube and receiving tube as moulder, even if input end not gate a(IC3) is high level, not gate a(IC3) output terminal is reversed to low level, because there being the buffer action of isolating diode (V1), not gate a(IC3) low level of output terminal is to not gate b(IC4) input end inoperative, make not gate c(IC5) output terminal remain high level, triode (VT) keeps conducting, the coil of relay (K) keeps energising, the contact switch of relay (Ka) remains open, continue prevention equipment accidental activation, prevent cramping accident.When fulfiling assignment, moulder withdraws from behind operation area, by moulder, manually press the button switch (SB), make not gate c(IC5) input end be high level, not gate c(IC5) output terminal is reversed to low level, triode (VT) cut-off, the coil of relay (K) power-off, it is closed that the contact switch of relay (Ka) recovers, for equipment normal starting ready, at not gate c(IC5) output terminal while being reversed to low level, by the effect of feedback resistance (R4), not gate b(IC4) input end is just low level, not gate b(IC4) output terminal is high level, not gate b(IC4) high level of output terminal is transported to not gate c(IC5 by isolation resistance (R3)) input end, at this moment, even if decontrol pushbutton switch (SB), not gate c(IC5) output terminal still keeps low level, make triode (VT) remain off, the coil of relay (K) keeps power-off, the contact switch of relay (Ka) remains closed, make the operation of equipment energy normal starting.
Claims (6)
1. the chain circuit of personnel protection, it is characterized in that circuit is by power interface, rectifier transformer (TC), rectification integrated package (IC1), filter capacitor a(C1), regulator block (IC2), filter capacitor b(C2), infrared emission tube, infrared receiver tube, current-limiting resistance (R1), signal transmission interface, not gate a(IC3), isolating diode (V1), not gate b(IC4), feedback resistance (R4), isolation resistance (R3), pushbutton switch (SB), not gate c(IC5), drive resistance (R5), triode (VT), clamp diode (V2), relay and chain output interface form, wherein, power interface comprises power interface a(I) and power interface b(II), rectifier transformer (TC) comprises primary coil and secondary coil, and primary coil has line end a(1) and line end b(2) pick out, secondary coil has line end c(3) and line end d(4) pick out, infrared emission tube and infrared receiver tube pairing are used, signal transmission interface comprises feeding interface (III), signaling interface (IV) and circuit interface (V), relay pack vinculum circle (K) and contact switch (Ka), chain output interface comprises chain interface a(VI) and chain interface b(VII),
Power interface a(I) and power interface b(II) be connected respectively to the line end a(1 of rectifier transformer (TC)) and line end b(2), the line end c(3 of rectifier transformer (TC)) and line end d(4) be connected respectively to two input ends of rectification integrated package (IC1), the positive pole of rectification integrated package (IC1) is connected to filter capacitor a(C1) positive pole and the input end of regulator block (IC2), the output terminal of regulator block (IC2) and filter capacitor b(C2) positive pole form working power (V+) after being connected, the negative pole of rectification integrated package (IC1) and filter capacitor a(C1) negative pole, the earth terminal of regulator block (IC2) and filter capacitor b(C2) negative pole form ground wire after being connected,
Working power (V+) is connected to the anode of infrared emission tube and the negative electrode of infrared receiver tube by feeding interface (III), the negative electrode of infrared emission tube is connected to the first pin of current-limiting resistance (R1) by circuit interface (V), the crus secunda of current-limiting resistance (R1) is connected to ground wire, the anode of infrared receiver tube is connected to not gate a(IC3 by signaling interface (IV)) input end, not gate a(IC3) output terminal is connected to the anode of isolating diode (V1), the negative electrode of isolating diode (V1) is connected to not gate b(IC4) input end and the first pin of feedback resistance (R4), not gate b(IC4) output terminal is connected to the first pin of isolation resistance (R3), the crus secunda of isolation resistance (R3) is connected to output terminal and the not gate c(IC5 of pushbutton switch (SB)) input end, the input end of pushbutton switch (SB) is connected to working power (V+), not gate c(IC5) output terminal is connected to the crus secunda of feedback resistance (R4) and drives the first pin of resistance (R5), the crus secunda of driving resistance (R5) is connected to the base stage of triode (VT), the emitter of triode (VT) is connected to ground wire, the collector of triode (VT) is connected to the anode of clamp diode (V2) and coil (K) output terminal of relay, coil (K) input end of the negative electrode of clamp diode (V2) and relay is connected to working power (V+), the contact switch of relay (Ka) input end is connected to chain interface a(VI), the contact switch of relay (Ka) output terminal is connected to chain interface b(VII).
2. the chain circuit of a kind of personnel protection according to claim 1; it is characterized in that at not gate a(IC3) input end and ground wire between have anti-interference condenser (C3) He Bang road resistance (R2); the first pin of the first Jiao Hebang road resistance (R2) of anti-interference condenser (C3) is connected to not gate a(IC3) input end, the crus secunda of the crus secunda He Bang road resistance (R2) of anti-interference condenser (C3) is connected to ground wire.
3. the chain circuit of a kind of personnel protection according to claim 1; it is characterized in that not gate a(IC3), not gate b(IC4) and not gate c(IC5) share six ungated integrated circuits; three unnecessary non-not gate c(IC5 that are parallel to) on; the power end of six ungated integrated circuits is connected to working power (V+), and the earth terminal of six ungated integrated circuits is connected to ground wire.
4. the chain circuit of a kind of personnel protection according to claim 1; it is characterized in that infrared emission tube is many; many infrared emission tubes connect with series system; the quantity of infrared receiver tube is identical with the quantity of infrared emission tube, and many infrared receiver tubes connect with series system.
5. the chain circuit of a kind of personnel protection according to claim 1, the contact switch (Ka) that it is characterized in that relay is the switch of normally closed contact.
6. the chain circuit of a kind of personnel protection according to claim 1; what it is characterized in that circuit is with the phase line (L) of power supply, the zero line (N) of power supply, chain wire a(X1 outward), chain wire b(X2) and opertaing device; on opertaing device, there is chain port; power interface a(I) and power interface b(II) be connected respectively to the phase line (L) of power supply and the zero line (N) of power supply, chain interface a(VI) and chain interface b(VII) respectively by chain wire a(X1) and chain wire b(X2) be connected to the chain port of opertaing device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410386056.5A CN104122827B (en) | 2014-08-07 | 2014-08-07 | Physical protection linkage circuit |
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| CN201410386056.5A CN104122827B (en) | 2014-08-07 | 2014-08-07 | Physical protection linkage circuit |
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| CN104122827A true CN104122827A (en) | 2014-10-29 |
| CN104122827B CN104122827B (en) | 2017-02-08 |
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|---|---|---|---|---|
| CN110468250A (en) * | 2019-08-07 | 2019-11-19 | 河钢股份有限公司承德分公司 | A kind of LF refining furnace receiving electrode platform safety interlock and control method |
| CN110468250B (en) * | 2019-08-07 | 2021-10-29 | 河钢股份有限公司承德分公司 | Safety interlocking device for LF refining furnace electrode connecting platform and control method |
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| Publication number | Publication date |
|---|---|
| CN104122827B (en) | 2017-02-08 |
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