A carburizing treatment monitoring system

Abstract

The present invention discloses a carburizing treatment monitoring system in the technical field of monitoring systems, which solves the problem of poor accuracy in regulating and monitoring carbon potential. The technical key points are: a carburizing treatment monitoring system, including a nitrogen tank, a zero point gas tank, a standard gas tank, an air pump and a gas analyzer. The carbon potential is adjusted by adjusting the CH4 gas concentration to meet the demand for carbon potential during the carburizing treatment process. A feasible method for regulating and monitoring carbon potential is added to the prior art, thereby enriching the method for regulating and monitoring carbon potential. A carburizing treatment monitoring method is also disclosed, including the following steps: zero point calibration; slope calibration; automatic nitrogen purge; early stage of strong carburizing stage; late stage of strong carburizing stage; diffusion stage. Through slope calibration and zero point calibration, and avoiding the influence of the gas in the carburizing furnace on the calibration of the gas analyzer, the advantage of improving the accuracy of regulating and monitoring carbon potential is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of monitoring systems, in particular to a carburizing treatment monitoring system. Background Art

[0002] Carburizing refers to the process of infiltrating carbon atoms into the surface layer of steel. It also makes the low-carbon steel workpiece have the surface layer of high-carbon steel. After quenching and low-temperature tempering and other heat treatment processes, the surface layer of the workpiece has high hardness and wear resistance, while the center of the workpiece still maintains the toughness and plasticity of low-carbon steel. The carburizing process is widely used in the processing of gears, shafts, camshafts and other parts of aircraft, automobiles and tractors. Gas carburizing is a carburizing treatment process that uses active gas containing carbon atoms as a carbon-containing medium. In order to ensure the carburizing treatment effect of the workpiece, it is necessary to ensure the stability and accuracy of the gas content.

[0003] In the prior art, the gas in the carburizing furnace is extracted and the gas sample is input into the furnace gas analyzer, and the gas sample is detected by the furnace gas analyzer, thereby realizing the function of detecting the gas composition in the carburizing furnace. The Chinese invention patent application document with the announcement number CN109085042A discloses a portable furnace gas analyzer, including a power supply system and a gas analysis system, wherein the power supply system supplies power to the gas analysis system, the gas analysis system includes a gas processing module, a gas flow regulating module, an analysis processing module and a display module, the gas processing module includes an air intake unit, a primary filter unit, a gas flow display unit, a secondary filter unit and a tertiary filter unit connected in sequence through an air pipe, and the analysis processing module includes a sensor unit, an exhaust unit, an atmosphere calculator and a data storage chip, thereby realizing the detection of the components in the atmosphere of the heat treatment furnace. The CO sensor module, CO2 sensor module and CH4 sensor module of the sensor unit sense CO, CO2 and CH4 in the furnace gas respectively, and the carbon potential Cp value is calculated through the formula lg[(%CO)2 / (%CO2)]*P=-6311 / T+10.165+lgCp-(1-Cp)2*(350 / T+1.86), where %CO refers to the CO content in the gas, %CO2 refers to the CO2 content in the gas, and P and T are known values.

[0004] At present, the regulation of carbon potential during carburizing treatment relies on the control and monitoring of CO content and CO2 content. The regulation and monitoring method is single and has certain limitations, which easily leads to inaccurate regulation and monitoring of carbon potential. Therefore, the existing technology has the problem of poor accuracy in regulating and monitoring carbon potential. Summary of the invention

[0005] In order to overcome the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a carburizing treatment monitoring system, which has the advantages of high accuracy in regulating and monitoring carbon potential.

[0006] The technical solution adopted by the present invention to solve its technical problem is:

[0007] A carburizing treatment monitoring system comprises a nitrogen tank, a zero-point gas tank, a standard gas tank, an air pump and a gas analyzer, wherein the air inlet end of the air pump is provided with an air inlet pipe connected to a carburizing furnace, the exhaust end of the air pump is connected to a detection tube, the gas analyzer is connected to the detection tube, the detection tube is provided with a condenser located between the gas analyzer and the air pump, the zero-point gas tank and the standard gas tank are both connected to the detection tube between the gas analyzer and the air pump, the nitrogen tank is connected to the air inlet pipe, the air inlet pipe is provided with an air inlet solenoid valve, a nitrogen solenoid valve is provided between the nitrogen tank and the air inlet pipe, a zero-point solenoid valve is provided between the zero-point gas tank and the detection tube, a standard solenoid valve is provided between the standard gas tank and the detection tube, nitrogen is stored in the zero-point gas tank, and a calibration mixed gas is stored in the standard gas tank.

[0008] As a further improvement of the present invention: it also includes a circuit breaker assembly, which is electrically connected to an external power supply, and the circuit breaker assembly is electrically connected to a power supply module, and the power supply module is electrically connected to the air intake solenoid valve, the nitrogen solenoid valve, the zero point solenoid valve, the standard solenoid valve and the gas analyzer respectively.

[0009] As a further improvement of the present invention: the circuit breaker assembly includes a first circuit breaker, a second circuit breaker and a third circuit breaker, the first circuit breaker is electrically connected to the power supply module, the second circuit breaker is electrically connected to the socket, and the third circuit breaker is electrically connected to the refrigerator installed at the gas analyzer.

[0010] As a further improvement of the present invention: it also includes a control module, which is electrically connected to the air intake solenoid valve, the nitrogen solenoid valve, the zero point solenoid valve and the standard solenoid valve respectively, a detection flow meter is provided between the air pump and the gas analyzer, the control module is electrically connected to the detection flow meter, and the air pump is provided with a bypass flow meter, and the two ends of the bypass flow meter are respectively connected to the two ends of the air pump.

[0011] As a further improvement of the present invention: the control module is electrically connected to the gas analyzer, and the control module is electrically connected to an alarm device.

[0012] As a further improvement of the present invention: a flow detection meter is provided between the air pump and the gas analyzer, the detection tube is connected to a needle valve, the zero point gas tank and the standard gas tank are respectively connected to the needle valve, the gas analyzer is provided with a pressure difference detector, and both ends of the pressure difference detector are respectively connected to both ends of the gas analyzer.

[0013] A carburizing treatment monitoring method comprises the following steps:

[0014] Zero point calibration: close the air inlet solenoid valve and the standard solenoid valve, open the zero point solenoid valve, let the nitrogen in the zero point gas tank pass into the detection tube and the gas analyzer, and use the nitrogen to perform zero point calibration on the gas analyzer;

[0015] Slope calibration: close the air inlet solenoid valve and the zero point solenoid valve, open the standard solenoid valve, pass the standard mixed gas in the standard gas tank into the detection tube and the gas analyzer, and use the gas analyzer to detect the standard mixed gas. If the gas analyzer cannot accurately detect the gas concentration of the standard mixed gas, repeat the steps of zero point calibration. If the gas analyzer can accurately detect the gas concentration of the standard mixed gas, proceed to the next step;

[0016] Early stage of carburization: Use an air pump to input the gas sample in the carburizing furnace into the gas analyzer through the air inlet pipe and the detection tube, use the gas analyzer to detect the CH4 value of the gas sample, adjust the CH4 value in the carburizing furnace to increase the CH4 value, and use the gas analyzer to detect the Cp value of the gas sample;

[0017] In the late stage of carburizing: use an air pump to input the gas sample in the carburizing furnace into the gas analyzer through the air inlet pipe and the detection tube, use the gas analyzer to detect the CH4 value of the gas sample, adjust the CH4 value in the carburizing furnace to reduce the CH4 value, and use the gas analyzer to detect the Cp value of the gas sample;

[0018] Diffusion stage: Use an air pump to input the gas sample in the carburizing furnace into the gas analyzer through the air inlet pipe and the detection tube. Use the gas analyzer to detect the CH4 value of the gas sample. By adjusting the CH4 value in the carburizing furnace, the CH4 value remains stable, and the gas analyzer is used to detect the Cp value of the gas sample.

[0019] As a further improvement of the present invention: before the step of the early stage of strong infiltration, the following steps are also included:

[0020] Automatic nitrogen purge: Set the purge threshold in the control module, and use the flow meter to detect the air flow of the air pump. The flow meter sends a flow detection value to the control module that decreases as the air flow of the air pump decreases. If the flow detection value is less than the purge threshold, the control module controls the air intake solenoid valve to close and the nitrogen solenoid valve to open, so that the nitrogen in the nitrogen tank flows to the intake pipe for reverse purge.

[0021] As a further improvement of the present invention: in the step of automatic nitrogen purging, the following steps are also included:

[0022] If the flow detection value after nitrogen back-flushing is still lower than the purge threshold, the control module sends a command to the alarm device to trigger the alarm device to sound an alarm.

[0023] As a further improvement of the present invention: in the step of the early stage of strong infiltration, the following steps are also included:

[0024] The duration of the strong permeation was 180 minutes. At 30 minutes of strong permeation, the CH4 value was 7.9%, at 60 minutes of strong permeation, the CH4 value was 8.91%, and at 90 minutes of strong permeation, the CH4 value was 9.14%;

[0025] In the step of the late stage of strong penetration, the following steps are also included: at 120 minutes of strong penetration, the CH4 value is 9.08%, at 150 minutes of strong penetration, the CH4 value is 7.81%, and at 180 minutes of strong penetration, the CH4 value is 7.41%;

[0026] The steps of the diffusion stage also include the following steps: the carburizing diffusion time is 120 minutes, the CH4 value is 4.58% when the carburizing diffusion is 30 minutes, the CH4 value is 4.74% when the carburizing diffusion is 60 minutes, the CH4 value is 4.78% when the carburizing diffusion is 90 minutes, and the CH4 value is 4.72% when the carburizing diffusion is 120 minutes.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The CH4 gas concentration in the carburizing furnace is adjusted according to the carbon potential adaptability of the gas in the carburizing furnace, and the carbon potential is adjusted by adjusting the CH4 gas concentration to meet the demand for carbon potential during the carburizing process. A feasible method for adjusting and monitoring carbon potential is added to the existing technology, thereby enriching the methods for adjusting and monitoring carbon potential.

[0029] Through slope calibration and zero point calibration, the gas in the carburizing furnace can be prevented from affecting the calibration of the gas analyzer, thereby improving the accuracy of the calibration gas analyzer and achieving the advantage of improving the accuracy of regulating and monitoring the carbon potential.

[0030] The control module controls the closing of the air intake solenoid valve and the opening of the nitrogen solenoid valve according to the flow detection value, so that the nitrogen in the nitrogen tank flows to the intake pipe for reverse purge, so that the objects blocked in the intake pipe are blown out of the intake pipe by the nitrogen, thereby achieving the effect of self-repairing the fault, facilitating production and improving production efficiency.

[0031] Through the setting of the control module and the alarm device, the alarm can be issued more conveniently, and the control module can start the restart program according to the alarm information when the CO sensor module, CO2 sensor module and CH4 sensor module communicate incorrectly, which can improve the system's ability to self-eliminate faults to a certain extent, achieve the effect of facilitating production, and play a role in improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a structural schematic diagram of a carburizing treatment monitoring system in an embodiment of the present application;

[0033] Figure 2 This is a schematic diagram of the circuit connection structure of the circuit breaker assembly in the embodiment of the present application;

[0034] Figure 3 A schematic diagram of a carburizing treatment monitoring method in an embodiment of the present application;

[0035] Figure 4 It is a line graph of carbon potential Cp value and CH4 value and treatment time in the examples of this application.

[0036] Reference numerals: 11, air pump; 12, detection tube; 13, gas analyzer; 14, condenser; 15, detection flow meter; 16, exhaust pipe; 17, emptying flow meter; 18, precision filter; 19, pressure difference detector; 21, intake pipe; 22, nitrogen tank; 23, intake solenoid valve; 24, nitrogen solenoid valve; 25, first filter; 26, second filter; 27, third filter; 28, bypass flow meter; 31, Zero point gas tank; 32. Standard gas tank; 33. Zero point solenoid valve; 34. Standard solenoid valve; 35. Needle valve; 36. Zero point pressure regulating valve; 37. Standard pressure regulating valve; 41. Circuit breaker assembly; 42. First circuit breaker; 43. Second circuit breaker; 44. Third circuit breaker; 45. Socket; 46. Refrigerator; 47. Power supply module; 48. Control module; 49. Alarm device; 51. Solenoid valve power supply element; 52. Detection solenoid valve. DETAILED DESCRIPTION

[0037] The present invention is further described with reference to the accompanying drawings and embodiments:

[0038] Example:

[0039] A carburizing treatment monitoring system, such as Figures 1 to 4As shown, it includes a nitrogen tank 22, a zero-point gas tank 31, a standard gas tank 32, an air pump 11, a gas analyzer 13, a circuit breaker assembly 41 and a control module 48. The air inlet end of the air pump 11 is provided with an air inlet pipe 21 connected to the carburizing furnace, the exhaust end of the air pump 11 is connected to a detection tube 12, the gas analyzer 13 is connected to the detection tube 12, and the detection tube 12 is installed with a condenser 14 located between the gas analyzer 13 and the air pump 11, so that the water vapor entering the gas analyzer 13 is reduced by the condenser 14. The zero-point gas tank 31 and the standard gas tank 32 are both connected to the detection tube 12 between the gas analyzer 13 and the air pump 11, the nitrogen tank 22 is connected to the air inlet pipe 21, the air inlet pipe 21 is provided with an air inlet solenoid valve 23, a nitrogen solenoid valve 24 is provided between the nitrogen tank 22 and the air inlet pipe 21, a zero-point solenoid valve 33 is provided between the zero-point gas tank 31 and the detection tube 12, a zero-point pressure regulating valve 36 is connected to the zero-point gas tank 31, a standard solenoid valve 34 is provided between the standard gas tank 32 and the detection tube 12, and a standard pressure regulating valve 37 is connected to the standard gas tank 32. Nitrogen is stored in the zero-point gas tank 31, and a calibration mixed gas is stored in the standard gas tank 32. The detection tube 12 is connected with a needle valve 35, the zero-point gas tank 31 and the standard gas tank 32 are respectively connected to the needle valve 35, and the gas analyzer 13 is provided with a pressure difference detector 19. The two ends of the pressure difference detector 19 are respectively connected to the two ends of the gas analyzer 13. The pressure difference detector 19 is used to detect the pressure difference between the two ends of the gas analyzer 13. The setting of the pressure difference detector 19 facilitates the detection of the working state of the gas analyzer 13. The air intake pipe 21 is provided with a first filter 25, a second filter 26 and a third filter 27. The first filter 25, the second filter 26 and the third filter 27 are used to filter the gas in the air intake pipe 21 to reduce dust and other impurities entering the detection tube 12. The detection tube 12 is provided with a precision filter 18. The precision filter 18 is used to filter the gas in the detection tube 12 to reduce dust and other impurities entering the gas analyzer 13. The detection tube 12 is provided with a detection solenoid valve 52.

[0040] The exhaust end of the air pump 11 is connected to an exhaust pipe 16, and the exhaust pipe 16 is connected to an exhaust flow meter 17. When there is no need to input gas into the detection tube 12, the gas of the air pump 11 can be discharged through the exhaust pipe, which makes it convenient to use.

[0041] The gas analyzer 13 is provided with a CO sensor module, a CO2 sensor module and a CH4 sensor module, and can monitor the CO value, CO2 value and CH4 value respectively through the CO sensor module, the CO2 sensor module and the CH4 sensor module. In this embodiment, the CO value, the CO2 value and the CH4 value represent the CO gas concentration, the CO2 gas concentration and the CH4 gas concentration respectively. The nitrogen tank 22 stores high-purity nitrogen, and the standard gas tank 32 stores a standard mixed gas.

[0042] The air pump 11 extracts the gas in the carburizing furnace through the air inlet pipe 21, and transports the extracted gas sample to the gas analyzer 13 through the detection tube 12. The gas analyzer 13 is used to analyze and monitor the gas sample, so as to obtain the CO value, CO2 value and CH4 value, thereby realizing the function of monitoring the carbon potential of the gas in the carburizing furnace, and being able to adaptively adjust the CH4 gas concentration in the carburizing furnace according to the carbon potential of the gas in the carburizing furnace, and adjust the carbon potential by adjusting the CH4 gas concentration to meet the carbon potential demand during the carburizing treatment process.

[0043] The circuit breaker assembly 41 is electrically connected to an external power source, and the circuit breaker assembly 41 is electrically connected to a power supply module 47, and the power supply module 47 is electrically connected to the gas analyzer 13, and the power supply module 47 is electrically connected to a solenoid valve power supply element 51, and the solenoid valve power supply element 51 is respectively connected to the intake solenoid valve 23, the nitrogen solenoid valve 24, the zero point solenoid valve 33 and the standard solenoid valve 34. In this embodiment, the solenoid valve power supply element 51 adopts a hub, and the solenoid valve power supply element 51 is used to supply the intake solenoid valve 23, the nitrogen solenoid valve 24, the zero point solenoid valve 33 and the standard solenoid valve 34, thereby realizing the function of supplying power to the intake solenoid valve 23, the nitrogen solenoid valve 24, the zero point solenoid valve 33 and the standard solenoid valve 34 through the power supply module 47. The power supply module 47 is used to convert 220V AC power into 24V DC power. The circuit breaker assembly 41 is electrically connected to the power supply module 47, and then electrically connected to the air intake solenoid valve 23, the nitrogen solenoid valve 24, the zero point solenoid valve 33, the standard solenoid valve 34 and the gas analyzer 13 through the power supply module 47, thereby realizing the function of electrically connecting and supplying power to the air intake solenoid valve 23, the nitrogen solenoid valve 24, the zero point solenoid valve 33, the standard solenoid valve 34 and the gas analyzer 13. The circuit breaker assembly 41 includes a first circuit breaker 42, a second circuit breaker 43 and a third circuit breaker 44. The first circuit breaker 42 is electrically connected to the power supply module 47, the second circuit breaker 43 is electrically connected to the socket 45, and the third circuit breaker 44 is electrically connected to the refrigerator 46 installed at the gas analyzer 13.

[0044] The control module 48 is electrically connected to the air intake solenoid valve 23, the nitrogen solenoid valve 24, the zero solenoid valve 33 and the standard solenoid valve 34 respectively. A detection flow meter 15 is provided between the air pump 11 and the gas analyzer 13. The control module 48 is electrically connected to the detection flow meter 15. The air pump 11 is provided with a bypass flow meter 28. The two ends of the bypass flow meter 28 are respectively connected to the two ends of the air pump 11. The bypass flow meter 28 and the air pump 11 are connected in parallel. The gas circulates inside the bypass flow meter 28 to protect the air pump 11. In this embodiment, the control module 48 is a PLC module. The control module 48 is electrically connected to the air intake solenoid valve 23, the nitrogen solenoid valve 24, the zero solenoid valve 33 and the standard solenoid valve 34, so that the air intake solenoid valve 23, the nitrogen solenoid valve 24, the zero solenoid valve 33 and the standard solenoid valve 34 can be controlled by the control module 48. The detection flow meter 15 is used to detect the gas flow at both ends of the air pump 11. A purge threshold is preset in the control module 48. The flow detection device 15 detects the air flow of the air pump 11. The flow detection device 15 sends a flow detection value to the control module 48 that decreases as the air flow of the air pump 11 decreases. If the flow detection value is less than the purge threshold, the air flow of the air pump 11 is insufficient.

[0045] The control module 48 is electrically connected to the gas analyzer 13, and the control module 48 is electrically connected to an alarm device 49. In this embodiment, the alarm device 49 uses a buzzer and a warning light, which can emit sound and light alarms to achieve the function of sound and light alarms. The gas analyzer 13 sends a gas detection value to the control module 48, and an alarm threshold is preset in the control module 48. The gas detection value increases with the increase of the carbon potential of the gas in the detection tube 12. If the gas detection value is greater than the alarm threshold, the control module 48 sends a command to the alarm device 49 to trigger the alarm device 49 to sound an alarm.

[0046] A restart program is preset in the control module 48. When the restart program is started, the control module 48 controls the gas analyzer 13 to restart. If a communication error occurs in the CO sensor module, the CO2 sensor module, and the CH4 sensor module, the gas analyzer 13 sends an alarm message to the control module 48, triggering the control module 48 to start the restart program and restart the gas analyzer 13. If the alarm message is not eliminated after the restart program is completed, the restart program is started again. If the restart program is started three times, the control module 48 sends a command to the alarm device 49 to trigger the alarm device 49 to sound an alarm.

[0047] A carburizing treatment monitoring method comprises the following steps:

[0048] S1, zero point calibration: close the air inlet solenoid valve 23 and the standard solenoid valve 34, open the zero point solenoid valve 33, and let the nitrogen in the zero point gas tank 31 pass into the detection tube 12 and the gas analyzer 13, and perform zero point calibration on the gas analyzer 13 by nitrogen;

[0049] S2, slope calibration: close the air inlet solenoid valve 23 and the zero point solenoid valve 33, open the standard solenoid valve 34, and let the standard mixed gas in the standard gas tank 32 pass into the detection tube 12 and the gas analyzer 13. Use the gas analyzer 13 to detect the standard mixed gas. The composition of the standard mixed gas is a condition known to the operator. If the gas analyzer 13 cannot accurately detect the gas concentration of the standard mixed gas, repeat the step of zero point calibration. If the gas analyzer 13 can accurately detect the gas concentration of the standard mixed gas, proceed to the next step.

[0050] S3, automatic nitrogen purge: a purge threshold is set in the control module 48, the flow meter 15 detects the air flow of the air pump 11, and the flow meter 15 sends a flow detection value that decreases with the decrease of the air flow of the air pump 11 to the control module 48. If the flow detection value is less than the purge threshold, the control module 48 controls the air intake solenoid valve 23 to close and controls the nitrogen solenoid valve 24 to open, so that the nitrogen in the nitrogen tank 22 flows to the air intake pipe 21 for reverse purge; if the flow detection value after the nitrogen back-purge is still lower than the purge threshold, the control module 48 sends a command to the alarm device 49 to trigger the alarm device 49 to sound an alarm;

[0051] S4, early stage of strong penetration: use the air pump 11 to input the gas sample in the carburizing furnace into the gas analyzer 13 through the air inlet pipe 21 and the detection tube 12, use the gas analyzer 13 to detect the CH4 value of the gas sample, adjust the CH4 value in the carburizing furnace to increase the CH4 value, and use the gas analyzer 13 to detect the Cp value of the gas sample; the duration of strong penetration is 180 minutes, after 30 minutes of strong penetration, the CH4 value is 7.9%, after 60 minutes of strong penetration, the CH4 value is 8.91%, after 90 minutes of strong penetration, the CH4 value is 9.14%;

[0052] S5, strong infiltration late stage: using the air pump 11 to input the gas sample in the carburizing furnace into the gas analyzer 13 through the air inlet pipe 21 and the detection tube 12, using the gas analyzer 13 to detect the CH4 value of the gas sample, by adjusting the CH4 value in the carburizing furnace, so that the CH4 value decreases, and using the gas analyzer 13 to detect the Cp value of the gas sample; the steps in the strong infiltration late stage also include the following steps: when the strong infiltration is 120 minutes, the CH4 value is 9.08%, when the strong infiltration is 150 minutes, the CH4 value is 7.81%, and when the strong infiltration is 180 minutes, the CH4 value is 7.41%;

[0053] S6. Diffusion stage: use the air pump 11 to input the gas sample in the carburizing furnace into the gas analyzer 13 through the air inlet pipe 21 and the detection tube 12, use the gas analyzer 13 to detect the CH4 value of the gas sample, adjust the CH4 value in the carburizing furnace to keep the CH4 value stable, and use the gas analyzer 13 to detect the Cp value of the gas sample; the steps of the diffusion stage also include the following steps: the carburizing diffusion time is 120 minutes, when the carburizing diffusion is 30 minutes, the CH4 value is 4.58%, when the carburizing diffusion is 60 minutes, the CH4 value is 4.74%, when the carburizing diffusion is 90 minutes, the CH4 value is 4.78%, and when the carburizing diffusion is 120 minutes, the CH4 value is 4.72%.

[0054] During the carburizing process, it is necessary to undergo carburizing intensive infiltration and carburizing diffusion. In this embodiment, the intensive infiltration time is 180 minutes, and the carburizing diffusion time is 120 minutes. The monitoring data obtained during the carburizing process of the workpiece are as follows:

[0055] When the strong penetration is carried out for 30 minutes, the CH4 value is adjusted to 7.9%, and the carburizing Cp value is 0.513%; when the strong penetration is carried out for 60 minutes, the CH4 value is adjusted to 8.91%, and the carburizing Cp value is 0.671%; when the strong penetration is carried out for 90 minutes, the CH4 value is adjusted to 9.14%, and the carburizing Cp value is 0.833%;

[0056] When the strong penetration is 120 minutes, the CH4 value is adjusted to 9.08%, and the carburizing Cp value is 0.948%; when the strong penetration is 150 minutes, the CH4 value is adjusted to 7.81%, and the carburizing Cp value is 0.968%; when the strong penetration is 180 minutes, the CH4 value is adjusted to 7.41%, and the carburizing Cp value is 0.979%;

[0057] The carburizing diffusion time is 120 minutes. When the carburizing diffusion is 30 minutes, the CH4 value is adjusted to 4.58%, and the carburizing Cp value is 0.857%; when the carburizing diffusion is 60 minutes, the CH4 value is adjusted to 4.74%, and the carburizing Cp value is 0.839%; when the carburizing diffusion is 90 minutes, the CH4 value is adjusted to 4.78%, and the carburizing Cp value is 0.83%; when the carburizing diffusion is 120 minutes, the CH4 value is adjusted to 4.72%, and the carburizing Cp value is 0.833%.

[0058] The carburizing Cp value and CH4 value are shown in Table 1:

[0059] Table 1 Carburizing Cp value and CH4 value

[0060]

[0061]

[0062] In the early stage of strong penetration, the CH4 value increases, and the carburizing Cp value increases; in the late stage of strong penetration, the CH4 value decreases, and the Cp value remains within the set value range; during the entire carburizing diffusion stage, the CH4 value remains basically stable, and the Cp value also remains basically stable. Thus, the effect of adjusting the carburizing Cp value by adjusting the CH4 value is achieved.

[0063] This embodiment has the following advantages:

[0064] The CH4 gas concentration in the carburizing furnace is adjusted according to the carbon potential adaptability of the gas in the carburizing furnace, and the carbon potential is adjusted by adjusting the CH4 gas concentration to meet the demand for carbon potential during the carburizing process. A feasible method for adjusting and monitoring carbon potential is added to the existing technology, thereby enriching the methods for adjusting and monitoring carbon potential.

[0065] Close the electromagnetic valve to prevent the gas in the carburizing furnace from entering the gas analyzer 13 through the detection tube 12. Open the zero electromagnetic valve 33 and close the standard electromagnetic valve 34, so that the high-purity nitrogen in the nitrogen tank 22 is passed into the gas analyzer 13, so that the gas analyzer 13 can be zeroed to achieve the function of zero calibration. Thus, the gas in the carburizing furnace can be avoided from affecting the gas analyzer 13 during the process of zeroing the gas analyzer 13. Then open the standard electromagnetic valve 34 and close the zero electromagnetic valve 33, so that the standard mixed gas in the standard gas tank 32 is passed into the gas analyzer 13, so that the gas analyzer 13 can be calibrated to achieve the function of slope calibration. It can avoid the gas in the carburizing furnace from affecting the calibration of the gas analyzer 13, which improves the accuracy of the calibration gas analyzer 13 and achieves the advantages of improving the regulation and monitoring accuracy of the carbon potential.

[0066] The control module 48 controls the air intake solenoid valve 23 to close and the nitrogen solenoid valve 24 to open according to the flow detection value, so that the nitrogen in the nitrogen tank 22 flows to the intake pipe 21 for reverse purge, so that the objects blocked in the intake pipe 21 are blown out of the intake pipe 21 by the nitrogen, thereby achieving the effect of self-repairing the fault, facilitating production, and achieving the effect of improving production efficiency.

[0067] By setting up the control module 48 and the alarm device 49, it is possible to issue an alarm more conveniently, and the control module 48 can start the restart program according to the alarm information when communication errors occur among the CO sensor module, the CO2 sensor module and the CH4 sensor module, thereby improving the system's ability to self-eliminate faults to a certain extent, achieving the effect of facilitating production and improving production efficiency.

[0068] The gas flow rate of the zero point gas tank 31 and the standard gas tank 32 entering the detection tube 12 is adjusted by the needle valve 35, which makes it convenient to use and adjust. The gas flow rate of the zero point gas tank 31 and the standard gas tank 32 entering the detection tube 12 can be controlled within the range of 1.5L per minute to 2L per minute by the needle valve 35.

[0069] The second circuit breaker 43 is electrically connected to a socket 45, and the socket 45 can be conveniently used to power the expansion device, thereby facilitating the addition of the expansion device. The refrigerator 46 electrically connected to the third circuit breaker 44 can cool the gas analyzer 13 to prevent the gas analyzer 13 from being overheated, thereby protecting the gas analyzer 13 and increasing its service life.

[0070] An element is considered to be "connected" to another element. It can be directly connected to another element or there may be an intermediate element at the same time. The terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal communication of two elements. It can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this article are for illustrative purposes only and do not represent the only implementation method.

[0071] In summary, after reading the present invention document, ordinary technicians in this field can make various other corresponding transformation schemes based on the technical scheme and technical concept of the present invention without creative mental work, which all fall within the scope of protection of the present invention.

Claims

1. A carburizing treatment monitoring system, characterized in that: The invention comprises a nitrogen tank (22), a zero-point gas tank (31), a standard gas tank (32), an air pump (11) and a gas analyzer (13); the air inlet end of the air pump (11) is provided with an air inlet pipe (21) connected to a carburizing furnace; the air outlet end of the air pump (11) is connected to a detection pipe (12); the gas analyzer (13) is connected to the detection pipe (12); the detection pipe (12) is provided with a condenser (14) located between the gas analyzer (13) and the air pump (11); the zero-point gas tank (31) and the standard gas tank (32) are both connected to the detection pipe (12) between the gas analyzer (13) and the air pump (11); the nitrogen tank (22) is connected to the air inlet pipe (21); the air inlet pipe (21) is provided with an air inlet solenoid valve (23); a nitrogen solenoid valve (23) is provided between the nitrogen tank (22) and the air inlet pipe (21); 4), a zero-point electromagnetic valve (33) is provided between the zero-point gas tank (31) and the detection tube (12), a standard electromagnetic valve (34) is provided between the standard gas tank (32) and the detection tube (12), nitrogen is stored in the zero-point gas tank (31), and a calibration mixed gas is stored in the standard gas tank (32); and the control module (48) is also included, the control module (48) is electrically connected to the air intake electromagnetic valve (23), the nitrogen electromagnetic valve (24), the zero-point electromagnetic valve (33) and the standard electromagnetic valve (34), a detection flow meter (15) is provided between the air pump (11) and the gas analyzer (13), the control module (48) is electrically connected to the detection flow meter (15), and the air pump (11) is provided with a bypass flow meter (28), and the two ends of the bypass flow meter (28) are respectively connected to the two ends of the air pump (11); The device also includes a circuit breaker assembly (41), wherein the circuit breaker assembly (41) is electrically connected to an external power source, wherein the circuit breaker assembly (41) is electrically connected to a power supply module (47), and wherein the power supply module (47) is electrically connected to an air intake solenoid valve (23), a nitrogen solenoid valve (24), a zero point solenoid valve (33), a standard solenoid valve (34), and a gas analyzer (13); The control module controls the air intake solenoid valve to close and the nitrogen solenoid valve to open according to the flow detection value, so that the nitrogen in the nitrogen tank flows to the intake pipe for reverse purge, so that the objects blocked in the intake pipe are blown out of the intake pipe by the nitrogen, thereby achieving the function of self-repair of the fault; Through the setting of the control module and the alarm device, the alarm can be issued more conveniently, and the control module can start the restart program according to the alarm information when the CO sensor module, CO2 sensor module and CH4 sensor module communicate incorrectly, which can improve the system's ability to self-eliminate faults to a certain extent, achieve the effect of facilitating production, and play a role in improving production efficiency.

2. A carburizing treatment monitoring system according to claim 1, characterized in that: The circuit breaker assembly (41) comprises a first circuit breaker (42), a second circuit breaker (43) and a third circuit breaker (44); the first circuit breaker (42) is electrically connected to a power supply module (47); the second circuit breaker (43) is electrically connected to a socket (45); and the third circuit breaker (44) is electrically connected to a refrigerator (46) installed at the gas analyzer (13).

3. A carburizing treatment monitoring system according to claim 1, characterized in that: The control module (48) is electrically connected to the gas analyzer (13), and the control module (48) is electrically connected to an alarm device (49).

4. A carburizing treatment monitoring system according to claim 1, characterized in that: The detection tube (12) is connected to a needle valve (35), the zero-point gas tank (31) and the standard gas tank (32) are respectively connected to the needle valve (35), and the gas analyzer (13) is provided with a pressure difference detector (19), and two ends of the pressure difference detector (19) are respectively connected to two ends of the gas analyzer (13).

5. A method for monitoring carburizing treatment, characterized in that: The following steps are involved: Zero point calibration: close the air inlet solenoid valve (23) and the standard solenoid valve (34), open the zero point solenoid valve (33), and let the nitrogen in the zero point gas tank (31) flow into the detection tube (12) and the gas analyzer (13), and perform zero point calibration on the gas analyzer (13) by nitrogen; Slope calibration: close the air inlet solenoid valve (23) and the zero point solenoid valve (33), open the standard solenoid valve (34), pass the standard mixed gas in the standard gas tank (32) into the detection tube (12) and the gas analyzer (13), use the gas analyzer (13) to detect the standard mixed gas, if the gas analyzer (13) cannot accurately detect the gas concentration of the standard mixed gas, repeat the step of zero point calibration, if the gas analyzer (13) can accurately detect the gas concentration of the standard mixed gas, proceed to the next step; In the early stage of carburization: the gas sample in the carburizing furnace is input into the gas analyzer (13) through the gas inlet pipe (21) and the detection tube (12) by the air pump (11), the CH4 value of the gas sample is detected by the gas analyzer (13), the CH4 value in the carburizing furnace is adjusted to increase the CH4 value, and the Cp value of the gas sample is detected by the gas analyzer (13); In the late stage of carburization: the gas sample in the carburizing furnace is input into the gas analyzer (13) through the gas inlet pipe (21) and the detection pipe (12) by the air pump (11), and the CH4 value of the gas sample is detected by the gas analyzer (13). The CH4 value in the carburizing furnace is adjusted to reduce the CH4 value, and the Cp value of the gas sample is detected by the gas analyzer (13); Diffusion stage: using an air pump (11) to input the gas sample in the carburizing furnace into the gas analyzer (13) through the air inlet pipe (21) and the detection tube (12), using the gas analyzer (13) to detect the CH4 value of the gas sample, by adjusting the CH4 value in the carburizing furnace to keep the CH4 value stable, and using the gas analyzer (13) to detect the Cp value of the gas sample; Automatic nitrogen purging: a purging threshold is set in the control module (48), the flow meter (15) detects the air flow of the air pump (11), and the flow meter (15) sends a flow detection value that decreases as the air flow of the air pump (11) decreases to the control module (48). If the flow detection value is less than the purging threshold, the control module (48) controls the air intake solenoid valve (23) to close and controls the nitrogen solenoid valve (24) to open, so that the nitrogen in the nitrogen tank (22) flows to the air intake pipe (21) for reverse purging.

6. A carburizing treatment monitoring method according to claim 5, characterized in that: In the step of automatic nitrogen purging, the following steps are also included: If the flow rate detection value after nitrogen back-flushing is still lower than the purge threshold, the control module (48) sends an instruction to the alarm device (49) to trigger the alarm device (49) to sound an alarm.

7. A carburizing treatment monitoring method according to claim 5, characterized in that: The steps in the early stage of strong infiltration also include the following steps: The duration of the strong permeation was 180 minutes. At 30 minutes of strong permeation, the CH4 value was 7.9%, at 60 minutes of strong permeation, the CH4 value was 8.91%, and at 90 minutes of strong permeation, the CH4 value was 9.14%; The steps in the late stage of strong penetration also include the following steps: at 120 minutes of strong penetration, the CH4 value is 9.08%, at 150 minutes of strong penetration, the CH4 value is 7.81%, and at 180 minutes of strong penetration, the CH4 value is 7.41%; The steps of the diffusion stage also include the following steps: the carburizing diffusion time is 120 minutes, the CH4 value is 4.58% when the carburizing diffusion is 30 minutes, the CH4 value is 4.74% when the carburizing diffusion is 60 minutes, the CH4 value is 4.78% when the carburizing diffusion is 90 minutes, and the CH4 value is 4.72% when the carburizing diffusion is 120 minutes.

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