A rolling mill monitoring method and system

Abstract

The application discloses a rolling mill monitoring method and system, relates to the technical field of rolling mills, and can judge the running state of a supporting roller. The rolling mill monitoring method comprises the following steps: acquiring the bearing temperature of a rolling mill supporting roller under different graded working conditions; determining a periodical temperature threshold value under the graded working condition based on the temperature data acquired by the temperature sensor; judging whether the bearing temperature continuously rises and the temperature rise is greater than a first temperature difference within a first judgment period after the bearing temperature is greater than the periodical temperature threshold value, and triggering a first-level alarm if yes; judging whether the bearing temperature continuously rises and the temperature rise is greater than a second temperature difference within a second judgment period after the bearing temperature is greater than the periodical temperature threshold value, and triggering a second-level alarm if yes; judging whether the bearing temperature is greater than a first temperature threshold value, and triggering a first-level alarm if yes; and determining that the rolling mill supporting roller is in an abnormal state in the case that the first-level alarm or the second-level alarm is triggered.

Description

Technical Field

[0001] This application relates to the field of rolling mill technology, and in particular to a rolling mill monitoring method and system. Background Technology

[0002] Currently, during the rolling process, the support rolls are in a high-speed operating state. In order to ensure the production and quality of different products, the rolling mill will frequently replace the rolls. The installation of the rolls requires high precision because the unstable working state can easily cause wear on the rotating parts inside the bearing housing. Under the working state of high-speed rotation, high temperature can be generated in a very short time, eventually leading to bearing damage, support roll seizure, and causing the production line to be shut down for a long time.

[0003] In summary, how to avoid damage to rolling mill bearings is an urgent problem that needs to be solved. Summary of the Invention

[0004] The embodiments of this application provide a rolling mill detection method and system that can determine the operating status of support rolls.

[0005] A first aspect of this application provides a rolling mill monitoring method, comprising:

[0006] Temperature sensors were used to obtain the bearing temperature of the mill support rolls under different operating conditions.

[0007] Based on the temperature data obtained by the temperature sensor, the periodic temperature threshold of the mill support roll under the working condition of the grade is determined.

[0008] Within the first judgment period after the bearing temperature exceeds the cycle temperature threshold, it is determined whether the bearing temperature rises continuously and the temperature rise is greater than the first temperature difference. If so, a level one alarm is triggered.

[0009] Within the second judgment period after the bearing temperature exceeds the cycle temperature threshold, it is determined whether the bearing temperature rises continuously and the temperature rise is greater than the second temperature difference. If so, a level two alarm is triggered.

[0010] Determine whether the bearing temperature is greater than a first temperature threshold; if so, trigger a level one alarm.

[0011] If the first-level alarm or the second-level alarm is triggered, it is determined that the mill support roll is in an abnormal state;

[0012] Wherein, the first temperature threshold is higher than the sum of the periodic temperature threshold and the first temperature difference, or the first temperature difference threshold is higher than the sum of the periodic temperature threshold and the second temperature difference;

[0013] The second temperature difference is greater than the first temperature difference;

[0014] The second judgment period is shorter than the first judgment period.

[0015] In some embodiments, the method of using temperature sensors to obtain the bearing temperature of the mill support rolls under different graded operating conditions includes:

[0016] Temperature sensors were used to monitor the temperature of the thrust bearing and the radial bearing in the bearing housing, respectively.

[0017] The operating conditions are classified based on the different rotational speeds of the rolling mill;

[0018] The temperatures of the thrust bearing and the radial bearing were collected under different graded operating conditions.

[0019] Determine the temperature of the thrust bearing and the temperature of the radial bearing under the respective operating conditions of their respective classifications.

[0020] In some embodiments, after determining the periodic temperature threshold of the mill support roll under the current grade based on the temperature data acquired by the temperature sensor, the method further includes:

[0021] After each calculation cycle, update the cycle temperature threshold and the first temperature threshold;

[0022] The calculation period is longer than the first judgment period and the second judgment period.

[0023] In some implementations, the first determination period is 2N times the bearing temperature acquisition period;

[0024] The second determination period is N times the acquisition period of the bearing temperature;

[0025] Where N is a natural number greater than 1.

[0026] In some implementations, updating the periodic temperature threshold, the first temperature threshold, and the second temperature threshold after each calculation cycle includes:

[0027] The periodic temperature threshold is determined based on the 2σ criterion;

[0028] The first temperature threshold is determined based on the 3σ criterion;

[0029] The second temperature threshold is determined based on the sum of the first temperature threshold and the third temperature difference.

[0030] In some embodiments, the second temperature threshold is less than 100°C; or

[0031] The third temperature difference is greater than or equal to 5°C; or

[0032] The difference between the first temperature threshold and the periodic temperature threshold is greater than or equal to 10°C.

[0033] In some implementations, after determining whether the bearing temperature is greater than a first temperature threshold, the process includes:

[0034] If the bearing temperature is greater than the first temperature threshold, determine whether the bearing temperature is greater than the second temperature threshold. If so, trigger a level two alarm.

[0035] In some embodiments, the method further includes:

[0036] If the first alarm is not triggered within the first judgment period, the first judgment period is periodically repeated;

[0037] If the second alarm is not triggered within the second judgment period, the second judgment period is periodically repeated.

[0038] In some implementations, after triggering a Level 1 alarm or triggering a Level 2 alarm, the following steps are included:

[0039] In the event that the first alarm is triggered and / or the second alarm is triggered, the alarm information is transmitted to the visual interface;

[0040] The alarm information includes the triggering conditions for an alarm that has been triggered.

[0041] A second aspect of this application provides a rolling mill monitoring system, comprising:

[0042] The monitoring module is used to obtain the bearing temperature of the mill support rolls under different operating conditions.

[0043] The calculation module is used to determine the periodic temperature threshold of the mill support roll under the working conditions of the current grade based on the temperature data of the monitoring module.

[0044] The first judgment module is used to determine whether the bearing temperature is continuously rising and the temperature rise is greater than the first temperature difference within the first judgment period after the bearing temperature is greater than the periodic temperature threshold; if so, the alarm module is used to trigger a first-level alarm.

[0045] The second judgment module is used to determine whether the bearing temperature rises continuously and the temperature rise is greater than the second temperature difference within the second judgment period after the bearing temperature is greater than the cycle temperature threshold; if so, the alarm module is used to trigger a secondary alarm.

[0046] The third judgment module is used to determine whether the bearing temperature is greater than the first temperature threshold; if so, the alarm module is used to trigger a level one alarm.

[0047] An anomaly determination module is used to determine that the mill support roll is in an abnormal state when the first-level alarm or the second-level alarm is triggered.

[0048] Wherein, the second temperature threshold is higher than the first temperature threshold;

[0049] The first temperature threshold is higher than the sum of the periodic temperature threshold and the first temperature difference, or the first temperature difference threshold is higher than the sum of the periodic temperature threshold and the second temperature difference;

[0050] The second temperature difference is greater than the first temperature difference;

[0051] The second judgment period is shorter than the first judgment period.

[0052] The beneficial effects of this application are as follows:

[0053] This application sets the rolling mill operating conditions in different grades and collects the rolling mill temperature of the rolling mill support rolls under different graded operating conditions. The rolling mill support rolls under different operating conditions can be judged with different thresholds, thereby reasonably judging the abnormal state of the rolling mill support rolls. Attached Figure Description

[0054] Figure 1 A schematic flowchart illustrating a rolling mill monitoring method provided in this application embodiment;

[0055] Figure 2 This is a schematic partial structural diagram of a rolling mill monitoring system provided in an embodiment of this application.

[0056] The reference numerals in the figure represent:

[0057] 100. Monitoring module; 200. Calculation module; 310. First judgment module; 320. Second judgment module; 330. Third judgment module; 400. Alarm module; 500. Anomaly judgment module. Detailed Implementation

[0058] To better understand the technical solutions provided in the embodiments of this specification, the technical solutions of the embodiments of this specification will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of this specification and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this specification, rather than limitations on the technical solutions of this specification. In the absence of conflict, the embodiments of this specification and the technical features in the embodiments can be combined with each other.

[0059] In this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, without necessarily requiring or implying any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. The term "two or more" includes two or more cases.

[0060] The present application provides a mill monitoring method and system that can determine the operating status of support rolls.

[0061] The first aspect of this application, Figure 1 A schematic flowchart illustrating a rolling mill inspection method provided in this application embodiment is shown below. Figure 1 A rolling mill monitoring method is provided, including:

[0062] S100: Uses temperature sensors to obtain the bearing temperature of the mill support rolls under different operating conditions.

[0063] For example, the mill support rolls under different operating conditions will be at different temperatures during operation. By classifying the operating conditions of the mill, the mill support rolls under different operating conditions can be in different temperature ranges. For example, under the condition of low mill speed, the temperature of the mill support rolls is low, and under the condition of high mill speed, the temperature of the mill support rolls is relatively high. Therefore, judging the bearing temperature of the mill support rolls based on different operating conditions can avoid the occurrence of inaccurate judgment.

[0064] S200: Based on the temperature data obtained by the temperature sensor, determine the periodic temperature threshold of the mill support roll under the working conditions of the grade.

[0065] For example, a temperature sensor can acquire temperature data of the mill support rolls and the cycle temperature threshold under different graded operating conditions. By determining the operating condition of the mill support rolls, the cycle temperature threshold can be determined, and subsequent abnormal condition judgments can be made.

[0066] S300: Within the first judgment cycle after the bearing temperature exceeds the cycle temperature threshold, determine whether the bearing temperature rises continuously and the temperature rise is greater than the first temperature difference. If so, trigger a level one alarm.

[0067] For example, after determining the cycle temperature threshold, when the bearing temperature exceeds the cycle temperature threshold, the bearing temperature is further judged within the first judgment cycle to determine whether the mill support roll is heating up too quickly.

[0068] S400: In the second judgment cycle after the bearing temperature exceeds the cycle temperature threshold, determine whether the bearing temperature rises continuously and the temperature rise is greater than the second temperature difference. If so, trigger the second-level alarm.

[0069] For example, after determining the cycle temperature threshold, when the bearing temperature exceeds the cycle temperature threshold, the bearing temperature is further assessed in the second assessment cycle to determine whether the mill support roll is heating up too quickly. The temperature rise of the mill support roll in the second assessment cycle can be higher than that in the first assessment cycle; correspondingly, the alarm level of the secondary alarm can be higher than that of the primary alarm.

[0070] S500: Determine if the bearing temperature is greater than the first temperature threshold. If so, trigger a level one alarm.

[0071] For example, the bearing temperature can be determined, such as by comparing the bearing temperature with a first temperature threshold. If the bearing temperature is higher, a level one alarm is triggered.

[0072] S600: When a Level 1 or Level 2 alarm is triggered, the mill support roll is determined to be in an abnormal state.

[0073] In some examples, the first temperature threshold is higher than the sum of the periodic temperature threshold and the first temperature difference, or the first temperature difference threshold is higher than the sum of the periodic temperature threshold and the second temperature difference.

[0074] In some examples, the second judgment period is shorter than the first judgment period.

[0075] This application sets the rolling mill operating conditions in different grades and collects the rolling mill temperature of the rolling mill support rolls under different graded operating conditions. The rolling mill support rolls under different operating conditions can be judged with different thresholds, thereby reasonably judging the abnormal state of the rolling mill support rolls.

[0076] In some examples, step S100: using a temperature sensor to obtain the bearing temperature of the mill support roll under different graded operating conditions, including:

[0077] Temperature sensors were used to monitor the temperatures of the thrust bearing and radial bearing in the bearing housing, respectively.

[0078] The operating conditions are classified based on the different speeds of the rolling mill;

[0079] Temperatures of thrust bearings and radial bearings under different operating conditions were collected.

[0080] Determine the temperature of the thrust bearing and radial bearing under different operating conditions.

[0081] For example, the mill support roll is mounted on a bearing housing, which has a thrust bearing and a radial bearing. The bearing temperatures of the thrust bearing and the radial bearing can be obtained by temperature sensors, and the bearing temperatures of the two bearings can be determined to determine whether the mill support roll is in an abnormal state.

[0082] In some examples, the operating conditions can be divided into three levels: the mill speed range in the first level is [0, 500], the mill speed range in the second level is (500, 900], and the mill speed range in the third level is (900, 1000].

[0083] In some examples, after step S200: determining the periodic temperature threshold of the mill support roll under the operating conditions of the current grade based on the temperature data obtained from the temperature sensor, the method further includes:

[0084] After each calculation cycle, update the cycle temperature threshold and the first temperature threshold.

[0085] For example, since the mill temperature changes dynamically, to avoid the impact of fixed periodic temperature thresholds and first temperature thresholds on the accuracy of the judgment, the periodic temperature threshold and first temperature threshold can be updated periodically. Additionally, the temperature data of the mill support rolls can be obtained online or through actual operating conditions.

[0086] In some examples, the calculation cycle is longer than the first and second judgment cycles.

[0087] For example, the time unit for calculating the cycle can be hours, such as 1h, and the time unit for the cycle temperature threshold and the first temperature threshold can be minutes, such as 10min.

[0088] In some examples, the first judgment period is 2N times the bearing temperature acquisition period;

[0089] The second judgment period is N times the bearing temperature acquisition period;

[0090] N is a natural number greater than 1.

[0091] For example, the temperature sensor can acquire the bearing temperature in 1 minute. When N is 2, the first judgment period can be 4 minutes and the second judgment period can be 2 minutes.

[0092] In some examples, the step updates the cycle temperature threshold, the first temperature threshold, and the second temperature threshold after each calculation cycle, including:

[0093] Determine the periodic temperature threshold based on the 2σ criterion;

[0094] The first temperature threshold is determined based on the 3σ criterion;

[0095] The second temperature threshold is determined based on the sum of the first temperature threshold and the third temperature difference.

[0096] For example, a temperature judgment is performed when the bearing temperature exceeds the cycle temperature threshold. A first-level alarm is triggered when the bearing temperature exceeds the first temperature threshold. Therefore, the first temperature threshold obtained based on the corresponding criteria is higher than the cycle temperature threshold. After determining the first temperature threshold, a second temperature threshold can be further determined.

[0097] In some examples, each calculation cycle can acquire the latest 10,000 bearing temperature data for each operating condition, and based on the temperature data, the aforementioned cycle temperature threshold, first temperature threshold, and second temperature threshold can be determined.

[0098] In some examples, the second temperature threshold is less than 100°C;

[0099] Alternatively, the third temperature difference is greater than or equal to 5°C;

[0100] Alternatively, the difference between the first temperature threshold and the periodic temperature threshold is greater than or equal to 10°C.

[0101] For example, the second temperature threshold can be 85°C, 90°C or 95°C, the third temperature difference can be 5°C, 10°C or 15°C, and the difference between the first temperature threshold and the periodic temperature threshold can be 10°C, 15°C or 20°C.

[0102] In some examples, after step S500: determining whether the bearing temperature is greater than the first temperature threshold, the following is included:

[0103] If the bearing temperature is greater than the first temperature threshold, determine whether the bearing temperature is greater than the second temperature threshold. If so, trigger a level two alarm.

[0104] For example, if the second temperature threshold is higher than the first temperature threshold, then the alarm level of the second-level alarm can be higher than that of the first-level alarm.

[0105] In some examples, the method also includes:

[0106] If the first alarm is not triggered within the first judgment cycle, the first judgment cycle will be repeated periodically.

[0107] If the second alarm is not triggered within the second judgment cycle, the second judgment cycle will be repeated periodically.

[0108] For example, periodically cycling the first and second judgment cycles can prevent the bearing temperature from becoming too high or rising too quickly during the monitoring vacuum period.

[0109] In some examples, after triggering a Level 1 alert or a Level 2 alert, the following are included:

[0110] In the event of a Level 1 alarm, the alarm information will be transmitted to the visual interface;

[0111] Alternatively, if a level 2 alarm is triggered, the alarm information can be transmitted to a visual interface;

[0112] Alternatively, in the event of triggering a Level 1 or Level 2 alarm, the alarm information can be transmitted to a visual interface;

[0113] The alarm information includes the corresponding triggering conditions for alarms that have been triggered.

[0114] For example, the visualization interface can be displayed on a display panel, such as a screen. When an alarm is triggered, the alarm and its corresponding triggering conditions can be displayed on the visualization interface to allow staff to quickly assess the condition of the bearing support rollers.

[0115] The second aspect of this application, Figure 2 This is a schematic partial structural diagram of a rolling mill monitoring system provided in an embodiment of this application, with reference to... Figure 2 A rolling mill monitoring system is provided, which can detect rolling mill support rolls using any of the rolling mill detection methods described in the above-mentioned technical solutions. The rolling mill monitoring system includes:

[0116] The monitoring module 100 can acquire the bearing temperature of the mill support rolls under different operating conditions.

[0117] The calculation module 200 can determine the periodic temperature threshold of the mill support roll under the working conditions of the current grade based on the temperature data of the monitoring module 100.

[0118] The first judgment module 310 can determine whether the bearing temperature is continuously rising and the temperature rise is greater than the first temperature difference within the first judgment period after the bearing temperature is greater than the cycle temperature threshold. If so, the alarm module 400 can trigger a first-level alarm.

[0119] The second judgment module 320 can determine whether the bearing temperature is continuously rising and the temperature rise is greater than the second temperature difference within the second judgment cycle after the bearing temperature is greater than the cycle temperature threshold. If so, the alarm module 400 can trigger a second-level alarm.

[0120] The third judgment module 330 can determine whether the bearing temperature is greater than the first temperature threshold. If so, the alarm module 400 can trigger a first-level alarm.

[0121] The anomaly detection module 500 can determine that the mill support rolls are in an abnormal state when a first-level alarm or a second-level alarm is triggered.

[0122] In some examples, the second temperature threshold is higher than the first temperature threshold.

[0123] In some examples, the first temperature threshold is higher than the sum of the cycle temperature threshold and the first temperature difference, or the first temperature difference threshold is higher than the sum of the cycle temperature threshold and the second temperature difference.

[0124] In some examples, the second temperature difference is greater than the first temperature difference;

[0125] The second judgment period is shorter than the first judgment period.

[0126] It should be noted that the descriptions of each embodiment in the above embodiments have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0127] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

[0128] Although preferred embodiments have been described in this specification, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this specification.

[0129] Obviously, those skilled in the art can make various modifications and variations to this specification without departing from its spirit and scope. Therefore, if such modifications and variations fall within the scope of the claims and their equivalents, this specification is also intended to include such modifications and variations.

Claims

1. A method for monitoring rolling mills, characterized in that, include: The method of obtaining bearing temperatures of mill support rolls under different graded operating conditions using temperature sensors includes: monitoring the temperature of the thrust bearing and the radial bearing of the bearing housing using temperature sensors; classifying the operating conditions based on different speeds of the mill; collecting the temperatures of the thrust bearing and the radial bearing under different graded operating conditions; and determining the temperatures of the thrust bearing and the radial bearing under the operating conditions of their respective graded conditions. Based on the temperature data obtained by the temperature sensor, the periodic temperature threshold of the mill support roll under the working condition of the grade is determined. Within the first judgment period after the bearing temperature exceeds the cycle temperature threshold, it is determined whether the bearing temperature rises continuously and the temperature rise is greater than the first temperature difference. If so, a level one alarm is triggered. Within the second judgment period after the bearing temperature exceeds the cycle temperature threshold, it is determined whether the bearing temperature rises continuously and the temperature rise is greater than the second temperature difference. If so, a level two alarm is triggered. The first judgment period is 2N times the bearing temperature acquisition period; the second judgment period is N times the bearing temperature acquisition period; where N is a natural number greater than 1. Determine whether the bearing temperature is greater than a first temperature threshold; if so, trigger a level one alarm. If the bearing temperature is greater than the first temperature threshold, determine whether the bearing temperature is greater than the second temperature threshold. If so, trigger a level two alarm. If the first-level alarm or the second-level alarm is triggered, it is determined that the mill support roll is in an abnormal state; Wherein, the first temperature threshold is higher than the sum of the periodic temperature threshold and the first temperature difference, or the first temperature threshold is higher than the sum of the periodic temperature threshold and the second temperature difference; the second temperature difference is greater than the first temperature difference; and the second judgment period is shorter than the first judgment period. After each calculation cycle, the cycle temperature threshold and the first temperature threshold are updated; wherein the calculation cycle is longer than the first judgment cycle and the second judgment cycle; The step of updating the cycle temperature threshold and the first temperature threshold after each calculation cycle includes: based on 2 Criteria for determining the periodic temperature threshold; based on 3 The criteria are as follows: the first temperature threshold is determined; wherein, the second temperature threshold is determined based on the sum of the first temperature threshold and the third temperature difference; the second temperature threshold is less than 100°C; the third temperature difference is greater than or equal to 5°C; and the difference between the first temperature threshold and the periodic temperature threshold is greater than or equal to 10°C. If the first-level alarm is not triggered within the first judgment period, the first judgment period is cycled periodically; if the second-level alarm is not triggered within the second judgment period, the second judgment period is cycled periodically.

2. The mill monitoring method according to claim 1, characterized in that, After triggering a Level 1 alarm or triggering a Level 2 alarm, the following is included: In the event of triggering the Level 1 alarm and / or the Level 2 alarm, the alarm information will be transmitted to the visual interface; The alarm information includes the triggering conditions for an alarm that has been triggered.

3. A rolling mill monitoring system, characterized in that, include: The monitoring module is used to acquire the bearing temperature of the mill support roll under different graded operating conditions, including: monitoring the temperature of the thrust bearing and the radial bearing of the bearing housing using temperature sensors; classifying the operating conditions based on different speeds of the mill; collecting the temperatures of the thrust bearing and the radial bearing under different graded operating conditions; and determining the temperatures of the thrust bearing and the radial bearing under the operating conditions of their respective graded conditions. The calculation module is used to determine the periodic temperature threshold of the mill support roll under the working conditions of the current grade based on the temperature data of the monitoring module. The first judgment module is used to determine whether the bearing temperature is continuously rising and the temperature rise is greater than the first temperature difference within the first judgment period after the bearing temperature is greater than the periodic temperature threshold; if so, the alarm module is used to trigger a first-level alarm. The second judgment module is used to determine whether the bearing temperature is continuously rising and the temperature rise is greater than the second temperature difference within a second judgment period after the bearing temperature is greater than the periodic temperature threshold; if so, the alarm module is used to trigger a secondary alarm; the first judgment period is 2N times the bearing temperature acquisition period; the second judgment period is N times the bearing temperature acquisition period; where N is a natural number greater than 1. The third judgment module is used to determine whether the bearing temperature is greater than the first temperature threshold; if so, the alarm module is used to trigger a first-level alarm; if the bearing temperature is greater than the first temperature threshold, it is used to determine whether the bearing temperature is greater than the second temperature threshold; if so, a second-level alarm is triggered. An anomaly determination module is used to determine that the mill support roll is in an abnormal state when the first-level alarm or the second-level alarm is triggered. Wherein, the second temperature threshold is higher than the first temperature threshold; The first temperature threshold is higher than the sum of the periodic temperature threshold and the first temperature difference; or, the first temperature threshold is higher than the sum of the periodic temperature threshold and the second temperature difference; the second temperature difference is greater than the first temperature difference; the second judgment period is shorter than the first judgment period. After each calculation cycle, the cycle temperature threshold and the first temperature threshold are updated; wherein the calculation cycle is longer than the first judgment cycle and the second judgment cycle; The step of updating the cycle temperature threshold and the first temperature threshold after each calculation cycle includes: based on 2 Criteria for determining the periodic temperature threshold; based on 3 The criteria are as follows: the first temperature threshold is determined; wherein, the second temperature threshold is determined based on the sum of the first temperature threshold and the third temperature difference; the second temperature threshold is less than 100°C; the third temperature difference is greater than or equal to 5°C; and the difference between the first temperature threshold and the periodic temperature threshold is greater than or equal to 10°C. If the first-level alarm is not triggered within the first judgment period, the first judgment period is cycled periodically; if the second-level alarm is not triggered within the second judgment period, the second judgment period is cycled periodically.

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