CN218026272U

CN218026272U - System for detecting gas in continuous annealing furnace

Info

Publication number: CN218026272U
Application number: CN202221943204.5U
Authority: CN
Inventors: 陈默
Original assignee: Jiangsu Sigas Measurement And Control Equipment Co ltd
Current assignee: Jiangsu Sigas Measurement And Control Equipment Co ltd
Priority date: 2022-07-25
Filing date: 2022-07-25
Publication date: 2022-12-13
Anticipated expiration: 2032-07-25

Abstract

The utility model relates to a gaseous detecting system in continuous annealing stove, it includes annealing stove body, the top of annealing stove body is provided with cooling body and gas mechanism, the last intake pipe that is provided with of cooling body, the one end and the mechanism intercommunication that admits air of intake pipe, the other end and the annealing stove body intercommunication of intake pipe and extend into annealing stove body inside, be provided with the gas pipe in the gas mechanism, the gas pipe is kept away from the one end and the stove body intercommunication of gas mechanism and is extended into inside the annealing stove body, be provided with first valve body in the intake pipe, be provided with the second valve body on the gas pipe, annealing stove body is provided with control circuit board, the last temperature monitoring circuit that has been coupled of control circuit board, the temperature monitoring circuit is used for the inside annealing temperature of real-time supervision annealing stove body and controls the switch of first valve body and second valve body respectively. This application has the inside temperature of real time monitoring annealing stove, adjusts the effect of the temperature in the annealing course of working.

Description

Gas detection system in continuous annealing furnace

Technical Field

The application relates to the technical field of heat treatment equipment, in particular to a gas detection system in a continuous annealing furnace.

Background

Annealing is a common process flow in the process of processing a metal workpiece, which means that the metal workpiece is slowly heated to a certain temperature, kept for a sufficient time, and then cooled at a proper speed in order to reduce hardness and improve machinability.

Annealing stove among the prior art generally adopts and heats gas through external burning furnace, blows in the stove with steam through the fan again, but, current annealing stove is difficult to the control to gaseous temperature, leads to the work piece to carry out annealing treatment's high temperature or low excessively, leads to work piece annealing treatment effect relatively poor, and is difficult to be suitable for the annealing temperature requirement of different work pieces, consequently, has certain improvement space.

SUMMERY OF THE UTILITY MODEL

In order to monitor the temperature condition in the annealing process in real time and adjust the temperature in the annealing process, the application provides a gas detection system in a continuous annealing furnace.

The application provides a gaseous detecting system in continuous annealing stove adopts following technical scheme:

the utility model provides a gaseous detecting system in continuous annealing stove, includes annealing stove body, the left side intercommunication of annealing stove body is provided with the feed inlet, the right side intercommunication of annealing stove body is provided with the discharge gate, the top of annealing stove body is provided with cooling body and gas mechanism, the last intake pipe that is provided with of cooling body, the one end and the mechanism intercommunication that admits air of intake pipe, the other end and the annealing stove body intercommunication of intake pipe extend into annealing stove body inside, be provided with the gas pipe in the gas mechanism, the gas pipe is kept away from the one end of gas mechanism and is fed through with stove body and extend into annealing stove body inside, be provided with first valve body in the intake pipe, be provided with the second valve body on the gas pipe, annealing stove body is provided with control circuit board, first valve body and second valve body are connected in control circuit board electricity respectively, the last temperature monitoring circuit that couples of control circuit board, temperature monitoring circuit is used for the inside annealing temperature of real-time supervision annealing stove body and controls the switch of first valve body and second valve body respectively.

Through adopting above-mentioned technical scheme, the work piece that will wait to carry out annealing processing is put into to annealing stove body inside through the feed inlet, gas mechanism provides sufficient gas for annealing stove body inside, make annealing stove body inside treat the work piece of processing and carry out annealing treatment, the inside temperature of annealing stove body is monitored in real time to the temperature monitoring circuit on the control circuit board, after the inside temperature of annealing stove body reached the processing temperature of work piece too high, the second valve body outage that temperature monitoring circuit control gas on the pipe is the off-state, make gas mechanism reduce and give annealing stove body inside transport gas volume, thereby make the inside temperature reduction of annealing stove body through the reduction of gas volume, and simultaneously, first valve body in the intake pipe of temperature control circuit control cooling mechanism is the on-state, make the intake pipe be the on-state, cooling mechanism carries air conditioning to annealing stove body inside through the intake pipe, realize cooling inside the annealing stove body, realize the temperature of control annealing stove body, adjust the temperature in the annealing course of working.

Optionally, the temperature monitoring circuit includes a temperature monitoring unit, a judging unit and a control unit; the output of temperature monitoring unit is coupled in the judgement unit, the temperature monitoring unit is used for exporting detected signal to the judgement unit according to the inside temperature of annealing stove body, the output of judgement unit is coupled in the control unit, the judgement unit is provided with the temperature threshold value, the judgement unit is used for comparing detected signal and temperature threshold value and export judged signal to the control unit according to the comparative result, the control unit's output is coupled respectively in the power supply circuit of first valve body and the power supply circuit of second valve body, the control unit is used for exporting first control signal to first valve body and exports second control signal to the second valve body when receiving judged signal.

Through adopting the above technical scheme, the inside temperature of annealing stove body is monitored in real time to the temperature monitoring unit of temperature monitoring circuit, and output detected signal to the judgement unit according to the inside temperature of annealing stove body, the judgement unit is provided with the temperature threshold value, when detected signal is greater than the temperature threshold value, judgement unit output judgement signal to the control unit, when the control unit received the judgement signal, output first control signal to first valve body, export second control signal to second valve body simultaneously, make first valve body be the open mode, the second valve body is the closed mode, realize that control gas pipe is closed and the intake pipe is opened, and then adjust the inside temperature of annealing stove body.

Optionally, the temperature monitoring unit includes a temperature sensor, the temperature sensor is installed inside the annealing furnace body, the temperature sensor includes a thermistor PTC and a first resistor R1, the thermistor PTC is connected in series with the first resistor R1, the other end of the thermistor PTC is coupled to the power supply, the other end of the first resistor R1 is grounded, and the connection node of the thermistor PTC and the first resistor R1 is coupled to the judgment unit.

Through adopting above-mentioned technical scheme, install the inside temperature condition at the inside real-time supervision annealing stove body of annealing stove body through temperature sensor, when the inside high temperature of annealing stove body, thermistor PTC's resistance increases, and the voltage at first resistance R1's both ends reduces, and thermistor PTC and first resistance R1's connected node output low level, and the detected signal increase of temperature monitoring unit output realizes the temperature monitoring function.

Optionally, the determining unit includes a comparator N1 and an adjustable resistor RP, a first input end of the comparator N1 is coupled to a connection node between the thermistor PTC and the first resistor R1, a second input end of the comparator N1 is coupled to a slipping end of the adjustable resistor RP, one end of the adjustable resistor RP is coupled to the power supply, the other end of the adjustable resistor RP is grounded, and an output end of the comparator N1 is coupled to the control unit.

By adopting the technical scheme, the judging unit inputs a detection signal through the first input end of the comparator N1, the second input end of the comparator N1 inputs a temperature threshold value, the temperature threshold value is set by adjusting the resistance value of the adjustable resistor RP, when the detection signal received by the judging unit is greater than the set temperature threshold value, the first input end of the comparator N1 inputs a low level, the voltage input by the first input end of the comparator N1 is less than the voltage input by the second input end of the comparator N1, the output end of the comparator N1 outputs a high level, the judging unit outputs a judging signal to the control unit, and the temperature comparing and judging function is realized.

Optionally, the control unit includes a first switch subunit, the first switch subunit includes a first triode Q1, a base of the first triode Q1 is coupled to the output end of the comparator N1, a collector of the first triode Q1 is coupled to the power supply after being connected in series with a first relay KM1, an emitter of the first triode Q1 is grounded, the first relay KM1 includes a normally open contact switch KM1-1, and the normally open contact switch is connected in series with the power supply loop of the first valve body.

By adopting the technical scheme, the switch of the first valve body is controlled by the first switch subunit, when the control unit receives the judgment signal, the base electrode of the first triode Q1 of the first switch subunit inputs a high level, the first triode Q1 is in a conducting state, the first relay KM1 is electrified, the normally open contact switch KM1-1 is electrified to be in a closed state, the first valve body is electrified to be in an open state, and the function of controlling the switch of the first valve body is realized.

Optionally, the control unit further includes a second switch subunit, the second switch subunit includes a second triode Q2, a base of the second triode Q2 is coupled to the output end of the comparator N1, a collector of the second triode Q2 is coupled to the power supply after being connected in series with a second relay KM2, an emitter of the second triode Q2 is grounded, the second relay KM2 includes a normally closed contact switch KM2-2, and the normally closed contact switch KM2-2 is connected in series to the power supply loop of the second valve body.

By adopting the technical scheme, the second switch subunit controls the switch of the second valve body, when the control unit receives the judgment signal, the base of the second triode Q1 of the second switch subunit inputs a high level, the second triode Q2 is in a conducting state, the second relay KM2 is electrified, the normally closed contact switch KM2-2 is further electrified to be in a disconnecting state, the second valve body is in a closing state when being powered off, and the function of controlling the second valve body to be closed is achieved.

Optionally, the one end of intake pipe in annealing stove body inside extends along the length direction of annealing stove body, a plurality of venthole has evenly been seted up in the intake pipe, every the intercommunication has cooling nozzle on the venthole.

Through adopting above-mentioned technical scheme, through seting up a plurality of ventholes in the intake pipe, inside air conditioning in the intake pipe discharged to annealing stove body through a plurality of ventholes, a plurality of ventholes evenly set up in the intake pipe, can give annealing stove body inside evenly cool down, improve cooling effect.

Optionally, the top of annealing stove body has been seted up the exhaust hole, exhaust hole intercommunication has the blast pipe, the one end of blast pipe is passed the exhaust hole and is stretched into inside the annealing stove body, be provided with the aspiration pump on the blast pipe, the one end intercommunication of keeping away from the annealing stove body of blast pipe has the gas holder.

Through adopting above-mentioned technical scheme, through seting up the exhaust hole at annealing stove body top, the exhaust pipe in the exhaust hole is with the waste gas discharge to the gas holder of the inside production of annealing stove body, through gas holder storage waste gas, prevents waste gas discharge to the air in, effectively avoids environmental pollution.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the temperature inside the annealing furnace body is monitored in real time through a temperature monitoring circuit on a control circuit board, when the temperature inside the annealing furnace body reaches the overhigh processing temperature of a workpiece, the temperature monitoring circuit controls a second valve body on a gas pipe to be in a closed state in a power-off mode, a gas mechanism is enabled to reduce the gas quantity conveyed to the inside of the annealing furnace body, the temperature inside the annealing furnace body is reduced through the reduction of the gas quantity, meanwhile, a first valve body is in an open state, an air inlet pipe is in an open state, a cooling mechanism conveys cold air to the inside of the annealing furnace body through the air inlet pipe, cooling inside the annealing furnace body is realized, the temperature of the annealing furnace body is monitored, and the temperature in the annealing processing process is adjusted;

2. the plurality of air outlet holes are formed in the air inlet pipe, cold air in the air inlet pipe is discharged into the annealing furnace body through the plurality of air outlet holes, and the plurality of air outlet holes are uniformly formed in the air inlet pipe, so that the interior of the annealing furnace body can be uniformly cooled, and the cooling effect is improved;

3. through seting up the exhaust hole at annealing stove body top, the exhaust pipe in the exhaust hole discharges the waste gas of annealing stove body inside production to the gas holder, through gas holder storage waste gas, prevents waste gas discharge to the air in, effectively avoids environmental pollution.

Drawings

FIG. 1 is a schematic structural view of a system for detecting a gas in a furnace of a continuous annealing furnace according to an embodiment of the present application.

FIG. 2 is a sectional view of a system for detecting a gas in a furnace of a continuous annealing furnace according to an embodiment of the present application.

FIG. 3 is a circuit diagram of a temperature monitoring circuit of the furnace gas detection system of the continuous annealing furnace according to the embodiment of the present application.

Description of the reference numerals: 1. an annealing furnace body; 11. a feed inlet; 12. a discharge port; 13. an exhaust hole; 14. an observation window; 2. a cooling mechanism; 21. an air inlet pipe; 211. an air outlet; 212. cooling the nozzle; 22. a first valve body; 3. a gas mechanism; 31. a gas pipe; 32. a second valve body; 4. a gas storage tank; 41. an exhaust pipe; 42. an air pump; 5. a temperature monitoring unit; 6. a judgment unit; 7. a control unit; 71. a first switch subunit; 72. a second switch subunit.

Detailed Description

The present application is described in further detail below with reference to figures 1-3.

The embodiment of the application discloses a system for detecting gas in a continuous annealing furnace. Referring to fig. 1 and 2, the gas detection system in the continuous annealing furnace comprises an annealing furnace body 1, wherein a feed inlet 11 is communicated with the left side of the annealing furnace body 1, and a discharge outlet 12 is communicated with the right side of the annealing furnace body 1. An observation window 14 is arranged on the front side surface of the annealing furnace body 1, and a worker can conveniently observe the annealing treatment condition of the workpiece in the annealing furnace body 1 through the observation window 14. The top of the annealing furnace body 1 is provided with a cooling mechanism 2, a gas mechanism 3 and an exhaust hole 13, and the cooling mechanism 2 is used for providing cold air for the interior of the annealing furnace body 1 so as to realize the cooling function; the gas mechanism 3 is used for providing combustible gas for the interior of the annealing furnace body 1, and the temperature rise function of annealing treatment is realized.

The intercommunication has intake pipe 21 on cooling body 2, the one end that is close to cooling body 2 on the intake pipe 21 is provided with first valve body 22, the one end and the annealing stove body 1 intercommunication of valve body are kept away from to intake pipe 21, and extend into annealing stove body 1 inside, intake pipe 21 extends the setting at the inside one end of annealing stove body 1 along the length direction of annealing stove body 1, a plurality of venthole 211 has been seted up on intake pipe 21, a plurality of venthole 211 evenly sets up on intake pipe 21, the intercommunication has cooling nozzle 212 on every venthole 211. The last intercommunication of gas mechanism 3 has gas pipe 31, and the one end that gas pipe 31 is close to gas mechanism 3 is provided with second valve body 32, and the one end that second valve body 32 was kept away from to gas pipe 31 communicates in annealing stove body 1, and extends into inside annealing stove body 1. The annealing furnace body 1 is internally provided with a control circuit board, the first valve body 22 and the second valve body 32 are respectively electrically connected with the control circuit board, specifically, the first valve body 22 and the second valve body 32 are both electric valve bodies, and are in an open state when the first valve body 22 and the second valve body 32 are powered on, and are in a closed state when the first valve body 22 and the second valve body 32 are powered off.

The intercommunication has blast pipe 41 in the exhaust hole 13, inside blast pipe 41 passed exhaust hole 13 and extended into annealing stove body 1, the one end intercommunication that annealing stove body 1 was kept away from to blast pipe 41 has gas holder 4, the one end that blast pipe 41 is close to gas holder 4 is provided with aspiration pump 42, it is specific, aspiration pump 42 starts to extract the inside waste gas of annealing stove body 1 through blast pipe 41 and discharges to gas holder 4 in, save through gas holder 4, avoid the inside waste gas of producing of annealing stove body 1 directly to discharge to the air in, cause environmental pollution.

Referring to fig. 3, a temperature monitoring circuit for monitoring the annealing temperature inside the annealing furnace body 1 in real time and controlling the opening and closing of the first valve body 22 and the second valve body 32 is coupled to the control circuit board. The temperature monitoring circuit includes a temperature monitoring unit 5, a judgment unit 6, and a control unit 7.

The output end of the temperature monitoring unit 5 is coupled to the determination unit 6, and the temperature monitoring unit 5 is used for outputting a detection signal to the determination unit 6 according to the temperature inside the annealing furnace body 1. The temperature monitoring unit 5 comprises a temperature sensor, the temperature sensor is arranged inside the annealing furnace body 1, the temperature sensor comprises a thermistor PTC and a first resistor R1, the thermistor PTC is connected with the first resistor R1 in series, the other end of the thermistor PTC is coupled to a power supply, the other end of the first resistor R1 is grounded, and the connecting node of the thermistor PTC and the first resistor R1 is coupled to the judging unit 6.

Specifically, the temperature sensor monitors the temperature in the annealing furnace body 1 in real time, when the temperature inside the annealing furnace body 1 is too high, the resistance of the thermistor PTC is increased, the voltages at the two ends of the first resistor R1 are reduced, the connection node between the thermistor PTC and the first resistor R1 outputs a low level, and the temperature monitoring unit 5 outputs a detection signal to the judgment unit 6 to increase.

The output end of the determining unit 6 is coupled to the control unit 7, the determining unit 6 is configured to set a temperature threshold, and the determining unit 6 is configured to compare the received detection signal with the temperature threshold and output a determining signal to the control unit 7 according to the comparison result. The judging unit 6 includes a comparator N1 and an adjustable resistor RP, a first input terminal of the comparator N1 is an inverting input terminal, a second input terminal of the comparator N1 is a positive phase input terminal, the inverting input terminal of the comparator N1 is coupled to a connection node between the thermistor PTC and the first resistor R1, the positive phase input terminal of the comparator N1 is coupled to a slipping terminal of the adjustable resistor RP, one end of the adjustable resistor RP is connected to a power supply, the other end of the adjustable resistor RP is grounded, and an output terminal of the comparator N1 is coupled to the control unit 7.

Specifically, the judging unit 6 inputs the detection signal through the inverting input terminal of the comparator N1, the temperature threshold is input through the non-inverting input terminal of the comparator N1, the temperature threshold is set by setting the resistance value of the adjustable resistor RP, when the detection signal input by the judging unit 6 is increased, the inverting input terminal of the comparator N1 inputs the low level, the voltage input through the inverting input terminal of the comparator N1 is smaller than the voltage input through the non-inverting input terminal of the comparator N1, the output terminal of the comparator N1 outputs the high level, and the judging unit 6 outputs the judgment signal to the control unit 7.

The control unit 7 includes a first switch subunit 71 and a second switch subunit 72, wherein an output terminal of the first switch subunit 71 is coupled to the power supply loop of the first valve 22, an output terminal of the second switch subunit 72 is coupled to the power supply loop of the second valve 32, the first switch subunit 71 outputs an on control signal to the power supply loop of the first valve 22, and the second switch subunit 72 outputs an off control signal to the power supply loop of the second valve 32. The first switch subunit 71 includes an NPN-type first triode Q1 and a first relay KM1, a base of the first triode Q1 is coupled to an output end of the comparator N1, a collector of the first triode Q1 is coupled to a power source after being connected in series with the first relay KM1, an emitter of the first triode Q1 is grounded, the first relay KM1 includes a normally open contact switch KM1-1, and the normally open contact switch KM1-1 is connected in series with a power supply loop of the first valve body 22.

Specifically, when the control unit 7 receives the determination signal, the base of the NPN-type first transistor Q1 of the first switch subunit 71 inputs a high level, the first transistor Q1 is in a conducting state, the first relay KM1 is energized, so that the normally-open contact switch KM1-1 is energized in a closed state, and the first valve body 22 is energized in an open state.

The second switch subunit 72 includes an NPN-type transistor Q2 and a second relay KM2, a base of the second transistor Q2 is coupled to the output end of the comparator N1, a collector of the second transistor Q2 is coupled to the power supply after being connected in series with the second relay KM2, an emitter of the second transistor Q2 is grounded, the second relay KM2 includes a normally closed contact switch KM2-2, and the normally closed contact switch KM2-2 is connected in series with the power supply loop of the second valve body 32.

Specifically, a high level is input to the base of the NPN-type second transistor Q2 of the second switch subunit 72, the second transistor Q2 is in a conducting state, and the second relay KM2 is energized to energize the normally closed contact switch KM2-2 to be in a disconnected state, so that the second valve body 32 is in a closed state when de-energized.

The implementation principle of the system for detecting the gas in the continuous annealing furnace in the embodiment of the application is as follows:

the method comprises the steps of putting a workpiece to be annealed into an annealing furnace body 1 from a feeding hole 11 on the annealing furnace body 1, enabling a gas mechanism 3 to provide enough gas for the inside of the annealing furnace body 1 through a gas pipe 31, heating the inside of the annealing furnace body 1 to anneal the workpiece to be processed, starting a temperature monitoring circuit on a control circuit board of the annealing furnace body 1, enabling a temperature sensor of a temperature monitoring unit 5 to monitor the temperature inside the annealing furnace body 1 in real time, increasing the resistance value of a thermistor PTC after the temperature inside the annealing furnace body 1 exceeds the processing temperature of the workpiece, reducing the voltage at two ends of a first resistor R1, outputting a low level by a connection node of the thermistor PTC and the first resistor R1, increasing a detection signal output by the temperature monitoring unit 5 to a judging unit 6, inputting a temperature threshold value by a comparator N1 of the judging unit 6 through a positive phase input end, wherein the detection signal is larger than the temperature threshold value, the low level is input at the inverting input end of the comparator N1, the voltage input at the inverting input end of the comparator N1 is less than the voltage input at the non-inverting input end of the comparator N1, the high level is output at the output end of the comparator N1, the judging unit 6 outputs a judging signal to the control unit 7, when the first switch subunit 71 of the control unit 7 receives the judging signal, the high level is input at the base electrode of the NPN type first triode Q1 of the first switch subunit 71, the first triode Q1 is in a conducting state, the first relay KM1 is electrified to enable the normally open contact KM1-1 to be electrified in a closed state, the power supply loop of the first valve body 22 is conducted, the first valve body 22 is electrified in an open state, the air inlet pipe 21 is conducted, the cooling mechanism 2 conveys the cold air into the annealing furnace body 1 through the air inlet pipe 21, the cold air in the air inlet pipe 21 is discharged into the annealing furnace body 1 through a plurality of air outlet holes 211, the plurality of air outlet holes 211 are uniformly arranged on the air inlet pipe 21, so that the interior of the annealing furnace body 1 can be uniformly cooled;

meanwhile, a base electrode of a second NPN type triode Q2 of the second switch subunit 72 inputs a high level, the second triode Q2 is in a conducting state, the second relay KM2 is electrified, the normally closed contact switch KM2-2 is electrified to be in a disconnected state, the second valve body 32 is in a closed state after being powered off, the gas mechanism 3 is enabled to reduce the gas conveying amount for the interior of the annealing furnace body 1, and the temperature in the annealing furnace body 1 is reduced through the reduction of the gas amount.

The inside waste gas that carries out annealing treatment and produce of annealing stove body 1 discharges to gas holder 4 through blast pipe 41 on the exhaust hole 13, through 4 storage waste gases of gas holder, prevents that waste gas from discharging to the air in, effectively avoids environmental pollution.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: equivalent changes in structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a gaseous detecting system in continuous annealing stove which characterized in that: including annealing stove body (1), the left side intercommunication of annealing stove body (1) is provided with feed inlet (11), the right side intercommunication of annealing stove body (1) is provided with discharge gate (12), the top of annealing stove body (1) is provided with cooling body (2) and gas mechanism (3), be provided with intake pipe (21) on cooling body (2), the one end and the mechanism's intercommunication that admits air of intake pipe (21), the other end and annealing stove body (1) intercommunication and extend into inside annealing stove body (1), be provided with gas pipe (31) on gas mechanism (3), the one end that gas mechanism (3) were kept away from in gas pipe (31) communicates with annealing stove body (1) and extends into inside annealing stove body (1), be provided with first valve body (22) on intake pipe (21), be provided with second valve body (32) on gas pipe (31), annealing stove body (1) is provided with control circuit board, the last temperature monitoring circuit that couples of control circuit board, the temperature monitoring circuit is used for the inside annealing stove body (1) annealing temperature of real-time supervision and controls first valve body (22) and second valve body (32) respectively.

2. The system for detecting a gas in a furnace of a continuous annealing furnace according to claim 1, wherein: the temperature monitoring circuit comprises a temperature monitoring unit (5), a judging unit (6) and a control unit (7); the output end of the temperature monitoring unit (5) is coupled to the judging unit (6), the temperature monitoring unit (5) is used for outputting a detection signal to the judging unit (6) according to the temperature inside the annealing furnace body (1), the output end of the judging unit (6) is coupled to the control unit (7), the judging unit (6) is provided with a temperature threshold value, the judging unit (6) is used for comparing the detection signal with the temperature threshold value and outputting a judgment signal to the control unit (7) according to a comparison result, the output end of the control unit (7) is respectively coupled to a power supply circuit of the first valve body (22) and a power supply circuit of the second valve body (32), and the control unit (7) is used for outputting a first control signal to the first valve body (22) and outputting a second control signal to the second valve body (32) when receiving the judgment signal.

3. The continuous annealing furnace gas detection system according to claim 2, characterized in that: the temperature monitoring unit (5) comprises a temperature sensor, the temperature sensor is installed inside the annealing furnace body (1), the temperature sensor comprises a thermistor PTC and a first resistor R1, the thermistor PTC is connected with the first resistor R1 in series, the other end of the thermistor PTC is coupled to a power supply, the other end of the first resistor R1 is grounded, and a connection node between the thermistor PTC and the first resistor R1 is coupled to the judgment unit (6).

4. The system for detecting a gas in a continuous annealing furnace according to claim 3, wherein: the judging unit (6) comprises a comparator N1 and an adjustable resistor RP, a first input end of the comparator N1 is coupled to a connection node of the thermistor PTC and the first resistor R1, a second input end of the comparator N1 is coupled to a slipping end of the adjustable resistor RP, one end of the adjustable resistor RP is coupled to a power supply, the other end of the adjustable resistor RP is grounded, and an output end of the comparator N1 is coupled to the control unit (7).

5. The system for detecting a gas in a furnace of a continuous annealing furnace according to claim 4, wherein: the control unit (7) comprises a first switch subunit (71), the first switch subunit (71) comprises a first triode Q1, the base of the first triode Q1 is coupled to the output end of the comparator N1, the collector of the first triode Q1 is connected in series with a first relay KM1 and then is coupled to a power supply, the emitter of the first triode Q1 is grounded, the first relay KM1 comprises a normally open contact switch KM1-1, and the normally open contact switch is connected in series with a power supply loop of the first valve body (22).

6. The continuous annealing furnace gas detection system according to claim 4, characterized in that: the control unit (7) further comprises a second switch subunit (72), the second switch subunit (72) comprises a second triode Q2, a base of the second triode Q2 is coupled to the output end of the comparator N1, a collector of the second triode Q2 is coupled to the power supply after being connected in series with a second relay KM2, an emitter of the second triode Q2 is grounded, the second relay KM2 comprises a normally closed contact switch KM2-2, and the normally closed contact switch KM2-2 is connected in series with a power supply loop of the second valve body (32).

7. The system for detecting a gas in a furnace of a continuous annealing furnace according to claim 1, wherein: the annealing furnace body (1) is inside one end of intake pipe (21) extends along the length direction of annealing furnace body (1), a plurality of venthole (211) have evenly been seted up on intake pipe (21), every the intercommunication has cooling nozzle (212) on venthole (211).

8. The system for detecting a gas in a furnace of a continuous annealing furnace according to claim 1, wherein: exhaust hole (13) have been seted up at the top of annealing stove body (1), exhaust hole (13) intercommunication has blast pipe (41), inside exhaust hole (13) were passed and stretched into annealing stove body (1) to the one end of blast pipe (41), be provided with aspiration pump (42) on blast pipe (41), the one end intercommunication of keeping away from annealing stove body (1) of blast pipe (41) has gas holder (4).