Temperature control method, device and system for material testing

Abstract

The present application relates to the field of material science and engineering, and particularly relates to a temperature control method, device and system for material testing. The method comprises: controlling the heating of the electric heating wire to make the temperature of the inner box rise to a first set temperature and stop heating, monitoring and recording the temperature of the inner box, and reheating at the end of the cooling process. During the repeated heating and cooling cycle, the size of the optimal temperature of the current stage and the optimal temperature of the next stage are compared within a set time length, if the optimal temperature of the current stage is less than the optimal temperature of the next stage, the temperature rise is completed by adjusting the cooling time; if the optimal temperature of the current stage is greater than the optimal temperature of the next stage, the temperature drop is completed by adjusting the cooling time and adjusting the relative angle of the sample box and the inner box. The method provided by the present application uses the characteristics of fast and stable pulse heating, slow and gradually slowing down of the temperature control, saves energy consumption, improves the stage connection process, avoids reverse heating, and reduces energy consumption.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of material science and engineering, and in particular, to a temperature control method, device and system for material testing. BACKGROUND

[0002] Creep test is widely used to evaluate the deformation characteristics of materials under high temperature and continuous stress conditions. By conducting creep test on materials, the reliability of the materials can be evaluated, and the service life of the materials can be predicted. Meanwhile, the performance data of the materials obtained in the creep test under long-term use conditions can be used to guide the selection and application of the materials.

[0003] Among them, temperature control is one of the most important factors in creep test, that is, by controlling the temperature to simulate the stress conditions in different environments to obtain accurate and reliable creep performance data. The existing technology often adopts the method of keeping the heater at a constant output power to stabilize the temperature at a fixed value. However, creep test often requires a long time, and this temperature control method produces high energy consumption, making the total energy consumption of the creep test also high.

[0004] Therefore, it is necessary to find a new temperature control method that can reduce the energy consumption of creep test. SUMMARY

[0005] Therefore, it is necessary to find a new temperature control method that can reduce the energy consumption of creep test.

[0006] The present application provides a temperature control method, device and system for material testing.

[0007] In one embodiment, the present application provides a temperature control method for material testing, comprising:

[0008] S1: control the heating of the heating wire to raise the temperature of the inner box to a first set temperature, and disconnect the power supply of the heating wire to stop heating;

[0009] S2: monitor and record the temperature of the inner box, and generate a temperature curve according to the monitored temperature of the inner box;

[0010] S3: make the temperature of the inner box decrease from the first set temperature to the optimal temperature of the current stage in the first cooling process, determine the time length t1 of the second cooling process according to the temperature curve, make the temperature of the inner box experience the second cooling process with a time length of t1 from the optimal temperature of the current stage, and after the second cooling process is completed, connect the power supply of the heating wire to perform S1;

[0011] S4: comparing the optimal temperature of the current stage with the optimal temperature of the next stage at a time point b which is a set time length before the set stage transition time point a during the repeated execution of steps S1-S3, if the optimal temperature of the current stage is less than the optimal temperature of the next stage, performing S5; if the optimal temperature of the current stage is greater than the optimal temperature of the next stage, performing S6;

[0012] S5: determining an average time length of a cycle of repeated execution of steps S1-S3 before the time point b, determining a time difference dc between an end time d of the last cycle in a bd section and the switching time point c according to the average time length of the cycle, and adjusting the time length of each cycle in the bd section according to the time difference dc so that the temperature at the set time point a rises to the optimal temperature of the next stage;

[0013] S6: determining an average cooling speed of the first cooling process of all cycles before the time point b, determining a time difference dc according to the average cooling speed, the average time length of the cycle, the set stage transition time point a and the switching time point c, and distributing the time difference dc to each cycle in the bd section, and adjusting the relative angle between the sample box and the inner box to make the inner box temperature decrease according to the average cooling speed from the first set temperature so that the inner box temperature decreases to the optimal temperature of the next stage at the set time point a.

[0014] In one embodiment, the present application provides a temperature control device for material testing, comprising:

[0015] a heating module: the heating module is used to perform step S1, control the heating wire to heat to make the inner box temperature rise to the first set temperature, and disconnect the power supply of the heating wire to stop heating;

[0016] a temperature monitoring module: the temperature monitoring module is used to perform step S2, monitor and record the inner box temperature, and generate a temperature curve according to the monitored inner box temperature;

[0017] a cooling module: the cooling module is used to perform step S3, make the inner box temperature decrease from the first set temperature to the optimal temperature of the current stage in the first cooling process, determine the time length t1 of the second cooling process according to the temperature curve, make the inner box temperature experience the second cooling process with the time length t1 from the optimal temperature of the current stage, and perform S1 by connecting the power supply of the heating wire after the second cooling process ends;

[0018] a comparison module: the comparison module is used to compare the optimal temperature of the current stage with the optimal temperature of the next stage at a time point b which is a set time length before the set stage transition time point a during the repeated execution of steps S1-S3, if the optimal temperature of the current stage is less than the optimal temperature of the next stage, performing S5; if the optimal temperature of the current stage is greater than the optimal temperature of the next stage, performing S6;

[0019] The first connection module is used to execute step S5, determine the average duration of the period of repeating steps S1 to S3 before time point b, determine the time difference dc between the end time d of the last period in the time period from time point b to switching time point c and switching time point c according to the average duration of the period, and adjust the duration of each period in bd segment according to the time difference dc to make the temperature rise to the optimal temperature of the next stage at the set time point a.

[0020] The second connection module is used to execute step S6, determine the average cooling speed of the first cooling process of all periods before time point b, determine a time difference dc according to the average cooling speed, the average duration of the period, the set stage connection time point a and switching time point c, and distribute the time difference dc to each period in bd segment, and adjust the relative angle of the sample box and the inner box to make the temperature of the inner box decrease from the first set temperature according to the average cooling speed to make the temperature of the inner box decrease to the optimal temperature of the next stage at the set time point a.

[0021] In one embodiment, the present application provides a temperature control system for material testing, comprising a control device, a heating device and a monitoring device.

[0022] The control device comprises a memory and a processor, and the memory stores a computer program which is executed by the processor to make the processor execute the steps of the temperature control method for material testing according to any one or more embodiments of the present application.

[0023] The heating device is used to heat the inner box and is connected with the control device.

[0024] The monitoring device is used for real-time monitoring of temperature and is linked with the control device.

[0025] The present application relates to the field of material science and engineering, and particularly relates to a temperature control method, device and system for material testing. The method comprises: controlling the heating of the electric heating wire to make the temperature of the inner box rise to a first set temperature and stop heating, monitoring and recording the temperature of the inner box, and reheating at the end of the cooling process. During the period of repeating heating and cooling, the optimal temperature of the current stage and the optimal temperature of the next stage are compared in a set time period, if the optimal temperature of the current stage is less than the optimal temperature of the next stage, the connection of heating is completed by adjusting the cooling duration, and if the optimal temperature of the current stage is greater than the optimal temperature of the next stage, the switching of cooling is completed by adjusting the cooling duration and adjusting the relative angle of the sample box and the inner box. The method provided by the present application utilizes the characteristics of fast and stable pulse heating, slow and gradually slow cooling to control the temperature, saves energy consumption, improves the stage connection process, avoids reverse heating, and reduces energy consumption. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 Flow chart of temperature control method for material testing in one embodiment;

[0027] Figure 2 Flow chart of temperature control method for material testing in one embodiment;

[0028] Figure 3 Curve diagram of temperature switching of inner box in one embodiment;

[0029] Figure 4 Curve diagram of temperature switching of inner box in one embodiment;

[0030] Figure 5 Sectional view of sample box and inner box in a creep testing machine provided by prior art;

[0031] Figure 6 Structure block diagram of temperature control device for material testing in one embodiment;

[0032] Figure 7 Structure block diagram of temperature control system for material testing in one embodiment;

[0033] Figure 8 Internal structure block diagram of control device in one embodiment.

[0034] In the drawings: 1, sample box; 2, inner box; 3, opening and closing port; 4, taking and placing port. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0036] It can be understood that the terms "first", "second", etc. used in the present application can be used herein to describe various elements, but unless specifically stated, these elements are not limited by these terms. These terms are only used to distinguish the first element from another element. For example, without departing from the scope of the present application, the first xx script can be referred to as the second xx script, and similarly, the second xx script can be referred to as the first xx script.

[0037] Figure 1 Flow chart of temperature control method for material testing in one embodiment, as shown in Figure 1 the temperature control method for material testing includes:

[0038] S1: control the heating of the heating wire to make the inner box temperature rise to a first set temperature, and stop heating by disconnecting the power supply of the heating wire;

[0039] S2: monitor and record the inner box temperature, and generate a temperature curve according to the monitored inner box temperature;

[0040] S3: make the inner box temperature decrease from the first set temperature to the optimal temperature of the current stage in a first temperature decreasing process, determine the time length t1 of a second temperature decreasing process according to the temperature curve, make the inner box temperature experience the second temperature decreasing process with the time length t1 from the optimal temperature of the current stage, after the second temperature decreasing process, connect the power supply of the heating wire to perform S1;

[0041] S4: repeat the steps S1 to S3 at a time point b which is a set time length before a stage connection time point a, compare the optimal temperature of the current stage with the optimal temperature of the next stage, if the optimal temperature of the current stage is less than the optimal temperature of the next stage, perform S5, if the optimal temperature of the current stage is greater than the optimal temperature of the next stage, perform S6;

[0042] S5: determine the average time length of the cycle of repeating the steps S1 to S3 before the time point b, determine the time difference dc between the end time d of the last cycle in the time period from the time point b to the switching time point c and the switching time point c according to the average time length of the cycle, and adjust the time length of each cycle in the bd period according to the time difference dc to make the temperature rise to the optimal temperature of the next stage at the set time point a;

[0043] S6: determine the average temperature decreasing speed of the first temperature decreasing process of all cycles before the time point b, determine a time difference dc according to the average temperature decreasing speed, the average time length of the cycle, the set stage connection time point a and the switching time point c, and distribute the time difference dc to each cycle in the bd period, and adjust the relative angle between the sample box and the inner box to make the inner box temperature decrease from the first set temperature according to the average temperature decreasing speed to make the inner box temperature decrease to the optimal temperature of the next stage at the set time point a.

[0044] In this embodiment, as shown in FIG. 1, the heating wire is controlled to heat, and the inner box temperature rises to a first set temperature. Figure 2 The heating wire is heated by controlling the power of the heating wire, and the temperature of the inner box continuously rises at a certain temperature rising speed until the temperature of the inner box reaches the first set temperature.

[0045] When the monitored temperature equals the first set temperature, the power supply of the electric heating wire is disconnected to stop heating. The first set temperature falls within the allowed temperature range, such as T1 to T2 according to the test sample, T1 is less than T2, the first set temperature is greater than T1 and less than T2, to prevent the temperature from exceeding the maximum value T2 of the set temperature range during the temperature rising process of the electric heating wire, a safety value T is set a , and according to the maximum value and the set safety value, the first set temperature is set to T2-T a , to ensure that the inner box temperature is controlled within the allowed temperature range. That is, when the inner box temperature rises to the first set temperature T2-T a , the power supply of the electric heating wire is disconnected, the electric heating wire stops heating, and enters the cooling process until the cooling process ends and the power supply of the electric heating wire is reconnected for re-heating.

[0046] The heating is repeatedly performed to obtain heat, and the heating is stopped when the temperature reaches the target temperature, and the temperature slowly decreases in the intermittent time. This pulse type holding method prevents the inner box temperature from suddenly decreasing to fall outside the allowed temperature range, and no additional energy consumption is required during the cooling process. The process gradually slows down as the temperature difference between the inner box temperature and the outside temperature gradually decreases, which avoids the need for "cold start" of the electric heating wire when re-heating is required in the next cycle. Generally, high energy consumption is generated when starting cooling, but in the present scheme, this situation can be avoided through the pulse type holding process, and the excess energy consumption generated by cold start is saved.

[0047] Meanwhile, the method proposed in the present application is different from the conventional method of constant power and same temperature continuous heating through the pulse type holding process. In each cycle, as shown in Figure 3 and Figure 4 , the energy consumption generated in each cycle of the present method can be regarded as the integral of the temperature curve with respect to time, that is, the integral (area) of the corresponding temperature curve with respect to the length of the complete cycle in a complete cycle. If heating is performed according to the conventional method, the energy consumption should be the integral (area) of the current stage optimal temperature T3 straight line parallel to the time axis with respect to time. Through comparison, it can be seen that the method proposed in the present application greatly saves energy consumption.

[0048] In the embodiment, the material testing process can be divided into three stages, namely initial stage, steady stage and acceleration stage. In the initial stage, the strain increases with time, but the increasing speed gradually slows down. In the steady stage, the strain increases uniformly with time, and this stage is relatively long. In the acceleration stage, the strain increases rapidly with time until the rupture point, and the greater the stress, the shorter the total time of this stage. The smaller the stress, the longer the total time of this stage. The strain refers to the pressure and the degree of change of the material being tested during the material testing process. The stress refers to the force acting on the inside of the object, which can cause the object to deform or produce strain.

[0049] The optimal temperature and the interval corresponding to each of the above stages may not be the same, which requires adjustment of the optimal temperature or temperature interval during the heating and cooling process. When entering the next stage from the current stage, if the optimal temperature decreases, the temperature cooling process is used to connect the new optimal temperature, and if the optimal temperature increases, the temperature heating process is used to connect the new temperature. Generally, the optimal temperature is the middle value of the temperature interval in the current stage, that is, if the temperature interval of the current stage is T1 to T2, the optimal temperature T3 of the current stage is:

[0050] T3 = (T2-T1) / 2

[0051] In the embodiment, the time length of each stage in the above process is determined, and the stage connection time points between stages are set accordingly. Since the optimal temperatures of different stages are not the same, to connect to the optimal temperature of the next stage at the connection time point a, it is necessary to determine the end time d of the last period from the time point b to the switching time point c before a certain set time length, and adjust the periods experienced in the bd segment time length, so that the time d coincides with the switching time point c, to ensure that the temperature connection of the stage is completed at the set stage connection time point.

[0052] If the optimal temperature of the next stage is higher than the optimal temperature of the current stage, that is, the optimal temperature of the next stage is connected through heating, heating should start at the switching time and directly heat to the optimal temperature of the next stage, rather than wait until the temperature falls to the minimum temperature before heating, which causes more unnecessary energy consumption.

[0053] If the optimal temperature of the next stage is lower than the optimal temperature of the current stage, meaning a cooling process is needed to reach the optimal temperature of the next stage, then heating must begin at the switching time, and cooling must begin upon reaching the first set temperature. The cooling rate must be controlled so that the temperature drops directly to the optimal temperature of the next stage at the switching time point 'a', instead of cycling through the original cycle until the temperature reaches its lowest point and then reheating in reverse. This reverse heating leads to energy waste. This solution, through improvements to the switching process, avoids the energy waste caused by reverse heating.

[0054] In this embodiment, as the temperature difference between the inside and outside of the chamber decreases during the cooling process, the cooling rate gradually decreases, making it difficult to predict the exact time when the inner chamber temperature will drop to the optimal temperature for the next stage. To ensure that the inner chamber temperature drops to the optimal temperature for the next stage at the transition time, it is necessary to calculate the average cooling rate during the first cooling process in each cycle. This average cooling rate is then maintained after the heating process is completed at the switching time, so that the inner chamber temperature reaches the optimal temperature for the next stage at the transition time.

[0055] To ensure that the inner chamber temperature decreases at an average cooling rate, in a specific scenario, the temperature control method for material testing proposed in this invention can be applied to the creep testing machine device in CN 211602738 U, such as... Figure 5 As shown, the sample chamber 1 and inner chamber 2 are rotated relative to each other, so that the opening 3 faces the take-out opening 4. By adjusting the alignment of the two openings, the greater the alignment, the greater the cooling rate. Therefore, by controlling the alignment of the two openings, the cooling rate is controlled, allowing the temperature to drop to the optimal temperature for the next stage at an average cooling rate. Simultaneously, after completing the stage transition, the sample chamber 1 and inner chamber 2 are returned to their initial positions during heat preservation, and the aforementioned cyclical process can be repeated.

[0056] Meanwhile, those skilled in the art will clearly understand that this application can also ensure that the inner chamber temperature decreases at the average cooling rate by means of cooling devices.

[0057] In one embodiment, such as Figure 2 As shown, determining the duration t1 of the second cooling process based on the temperature curve includes:

[0058] Based on the generated temperature curve, calculate the integral of the temperature curve over time between the time point e when the inner chamber temperature rises to the current optimal temperature and the time point f when the temperature drops to the current optimal temperature within the current cycle. ;

[0059] according to Determine the end time g of the second cooling process in the current cycle;

[0060] Taking the time interval between the time point f and the end time g as the duration t1 of the second cooling process.

[0061] In the present embodiment, since the temperature difference between the inner tank temperature and the ambient temperature gradually decreases during the cooling process, the cooling speed gradually decreases, and it is difficult to predict when the target temperature will be reached. In addition, due to the change in the temperature difference, the lowest temperature reached by each cycle when the cooling process is completed is not the same. Therefore, by using the property of integration, the curve of the inner tank temperature with respect to time is integrated with respect to time, representing the process of increasing the inner tank temperature from the current stage optimal temperature to the first set temperature, the temperature cumulative increase of the inner tank temperature with respect to the duration of the heating process, and the temperature cumulative decrease of the inner tank temperature with respect to the duration of the first cooling process, to determine the end time point of the cooling and the duration of the second cooling process.

[0062] In one embodiment, as shown in Figure 2 the average duration of the cycle before the time point b is determined by:

[0063] obtaining the total number N of cycles before the time point b that repeatedly perform steps S1 to S3;

[0064] dividing the total duration experienced before the time point b by N to obtain the average duration of the cycle before the time point b.

[0065] In the present embodiment, since the cooling speed of each cycle becomes slower and slower as the temperature difference between the inner and outer decreases, the average duration of each cycle is not the same, so the average duration of the cycle is obtained by dividing the total duration experienced by the cycles performed before the time point by the total number of cycles performed in that duration. Preferably, in the present embodiment, as shown in Figure 3 the selected time point b is the end time of any cycle, i.e. the cycle before the selected time point b is a complete cycle that has been performed.

[0066] In one embodiment, as shown in Figure 3 the time difference dc between the end time d of the last cycle in the time period from the time point b to the switching time point c and the switching time point c is determined according to the average duration of the cycle, including:

[0067] determining the lowest temperature of each cycle before the time point b, and calculating the average of the lowest temperatures;

[0068] obtaining the heating duration of each cycle before the time point b from the lowest temperature to the first set temperature, and calculating the average of the heating duration;

[0069] The average of the lowest temperature is calculated, and the temperature difference between the first set temperature is calculated, and the temperature difference is divided by the average of the heating time to obtain the heating speed;

[0070] According to the heating speed, the time required for the average of the lowest temperature to heat to the next stage optimal temperature is calculated ac;

[0071] According to the switching time point a and the time length ac, the switching time point c is determined;

[0072] The ac is subtracted from the set time length ba to obtain the bc segment time length;

[0073] The bc segment time length is divided by the average time length of the period to determine the number of complete periods in the bc segment and the end time d of the last period;

[0074] The time difference dc between the end time d of the period and the switching time point c is calculated.

[0075] In this embodiment, the temperature of the inner tank is raised to the first set temperature by controlling the heating of the heating wire, the power supply of the heating wire is turned off to stop heating, the temperature curve is generated by the detection data of the inner tank temperature, the end time of the second cooling process is determined according to the temperature curve, the power supply of the heating wire is turned on again to heat after the second cooling process is over, and the cycle of heating and cooling is repeated. Since the temperature drop speed becomes slower and slower as the temperature difference between the inside and outside becomes smaller and smaller, the end time of the period may not directly fall on the switching time point according to the foregoing cycle of operation, so the adjustment of the connection is needed, and this needs to determine the time difference between the end time of the last period before the switching time point and the switching time point in the preset time length, so that the period time in the set time length can be adjusted according to the time difference to make the end time and the switching time can be connected.

[0076] In this embodiment, since the lowest temperature of each period and the time length of each period are not the same, the average of the lowest temperature, the average of the time length of each period and the average of the time length of the heating process of each period are calculated first, as shown in Figure 3 The heating speed is kept constant, so the temperature difference between the first set temperature and the average of the lowest temperature is calculated, and the temperature difference is divided by the average of the time length of the heating process of each period to obtain the heating speed. The optimal temperature of the next stage is subtracted from the average of the lowest temperature, and the heating speed is obtained, and the time length of the ca segment is obtained. The switching time point c is obtained by reducing the time length of the ca segment from the time point a. At the same time, as shown in Figure 3As shown, the duration of the ba period is subtracted from the duration of the ca period to obtain the duration of the bc period. The duration of the bc period is divided by the average cycle duration to determine how many cycles can be completed in the time period from the set time point b to the switching time point c, and at which time point d the last cycle in these cycles will end. Finally, by calculating the time difference between the end time d of the last cycle in the bc period and the switching time point c, the deviation between the preset and the actual can be determined without the adjustment intervention.

[0077] In one embodiment, as shown in Figure 3 adjusting the duration of each cycle in the bd period according to the time difference dc so that the temperature at the set time point a rises to the optimal temperature of the next stage, includes:

[0078] equally distributing the time difference dc to each cycle in the bd period;

[0079] adjusting the duration of the second cooling process of each cycle in the bd period according to the distribution result so that the end time d of the last cycle in the bd period coincides with the switching time point c;

[0080] starting heating at the switching time point c so that the temperature of the inner tank rises to the optimal temperature of the next stage at the set stage transition time point.

[0081] In this embodiment, as shown in Figure 3 In this embodiment, as shown in

[0082] In one embodiment, as shown in Figure 4 recording the duration of the first cooling process of each cycle before the time point b;

[0083] calculating the temperature difference between the first set temperature and the optimal temperature of the current stage;

[0084] dividing the calculated temperature difference by the duration of each first cooling process to obtain the cooling speed of the first cooling process of each cycle;

[0085]

[0086] ​The average cooling speed of the first cooling process is calculated according to the cooling speeds of the first cooling process of each cycle.

[0087] In the embodiment, as shown in Figure 4 the temperature difference between the inner tank temperature and the ambient temperature gradually decreases during the cooling process, which leads to a gradual decrease in the cooling speed. Therefore, the cooling process of each cycle can be divided into a first cooling process and a second cooling process. In the first cooling process, the inner tank temperature decreases from the first set temperature to the optimal temperature of the current stage, and in the second cooling process, the inner tank temperature decreases from the optimal temperature of the current stage until the original cumulative temperature consumption is completed. Figure 4 It can be seen that the cooling speed of the first cooling process of each cycle before the time point b can be determined by calculation, and the cooling speed of the second cooling process is a variable. Since the cooling duration needs to be determined by the cooling speed and the temperature difference in the subsequent process, the average value of the cooling speed of the first cooling process can be selected.

[0088] In an embodiment, as shown in Figure 4 the time difference dc is determined according to the average cooling speed, the average duration of the cycle, the set stage connection time point a and the switching time point c, which includes:

[0089] determining the lowest temperature of each cycle before the time point b, and calculating the average value of the lowest temperature;

[0090] obtaining the warming-up duration from the lowest temperature to the first set temperature in each cycle before the time point b, and calculating the average value of the warming-up duration;

[0091] calculating the temperature difference between the average value of the lowest temperature and the first set temperature, and dividing the temperature difference by the average value of the warming-up duration to obtain the warming-up speed;

[0092] calculating the warming-up duration ch required for warming up from the average value of the lowest temperature to the first set temperature according to the warming-up speed;

[0093] determining the cooling duration ha required for cooling from the first set temperature to the optimal temperature of the next stage according to the average cooling speed;

[0094] determining the switching time point c according to the connection time point a and ch, ha;

[0095] subtracting the duration ch and the duration ha from the set duration ba to obtain the duration of the bc section;

[0096] obtaining the total number N1 of cycles before the time point b that repeat steps S1 to S3, and dividing the total duration experienced before the time point b by N1 to obtain the average duration of the cycle before the time point b;

[0097] The number of complete cycles within the bc segment and the end time d of the last cycle are determined by dividing the duration of the bc segment by the average duration of the cycle.

[0098] Calculate the time difference dc between the switching time point c and the cycle end time d.

[0099] In this embodiment, as Figure 4 As shown, in this embodiment, since the optimal temperature of the next stage is lower than the optimal temperature of the current stage, it belongs to the cooling stage transition. In order to ensure that the inner chamber temperature drops directly to the optimal temperature of the next stage at the stage transition time point, it is necessary to calculate backward from the set stage transition point, based on the time ch required to heat up from the average minimum temperature to the first set temperature according to the fixed heating rate, and the time ha required to cool down to the optimal temperature of the next stage according to the average cooling rate of the first cooling process, to determine the specific switching time point. At the same time, based on the executed cycles, it is calculated how many cycles can be executed within the bc segment according to the average duration of the cycle, and when the last cycle ends. By determining how much time deviation there is if the end time of the last cycle is to overlap with the switching time point, i.e., the time difference dc.

[0100] In one embodiment, such as Figure 4 As shown, the method of allocating the time difference dc to each period within the bd time period includes:

[0101] The time difference dc is evenly distributed among the cycles within the bd segment;

[0102] Based on the allocation results, the duration of the second cooling process in each cycle is adjusted so that the end time d of the last cycle in segment bd coincides with the switching time point c.

[0103] In this embodiment, to ensure that at the switching time point c, all previous cycles have just ended, and a new heating cycle begins at that time point, the calculated time difference value dc is evenly distributed across each cycle in the bd segment. That is, the total number of cycles in the bd segment where the time difference value dc falls determines the adjustment duration for each cycle within the bd segment. For example... Figure 4 As shown, by shortening or lengthening each cycle within the bd segment, the end time d of the last cycle of the bd segment is made to fall on the switching time point c.

[0104] In one embodiment, such as Figure 6 As shown, the temperature control device for material testing includes:

[0105] Heating module: The heating module is used to execute step S1, control the heating wire to heat up the inner box to the first set temperature, and disconnect the power supply of the heating wire to stop heating;

[0106] The temperature monitoring module is configured to perform step S2, monitor and record the inner box temperature, and generate a temperature curve according to the monitored inner box temperature;

[0107] The temperature decreasing module is configured to perform step S3, decrease the inner box temperature from the first set temperature to the optimal temperature of the current stage in the first temperature decreasing process, determine the time length t1 of the second temperature decreasing process according to the temperature curve, make the inner box temperature experience the second temperature decreasing process with the time length t1 from the optimal temperature of the current stage, and turn on the power supply of the electric heating wire to perform S1 after the second temperature decreasing process ends;

[0108] The comparison module is configured to compare the optimal temperature of the current stage and the optimal temperature of the next stage at the time point b before the set stage connection time point a in the process of repeatedly performing steps S1-S3, and perform S5 if the optimal temperature of the current stage is less than the optimal temperature of the next stage, and perform S6 if the optimal temperature of the current stage is greater than the optimal temperature of the next stage.

[0109] The connection module one is configured to perform step S5, determine the average time length of the period of repeatedly performing steps S1-S3 before the time point b, determine the time difference dc between the end time d of the last period in the time period from the time point b to the switching time point c and the switching time point c according to the average time length of the period, and adjust the time length of each period in the bd section according to the time difference dc to make the temperature rise to the optimal temperature of the next stage at the set time point a.

[0110] The connection module two is configured to perform step S6, determine the average temperature decreasing speed of the first temperature decreasing process of all periods before the time point b, determine a time difference dc according to the average temperature decreasing speed, the average time length of the period, the set stage connection time point a and the switching time point c, and distribute the time difference dc to each period in the bd section, and adjust the relative angle between the sample box and the inner box to make the inner box temperature decrease from the first set temperature according to the average temperature decreasing speed to make the inner box temperature decrease to the optimal temperature of the next stage at the set time point a.

[0111] In the embodiment, the above-mentioned modules are modularization of the temperature control method for material testing provided by the present application. For the explanation of each module, please refer to the content of the method part of the present application, which will not be repeated here.

[0112] In one embodiment, as shown in Figure 7 a temperature control system for material testing is provided, which comprises a control device, a heating device and a monitoring device.

[0113] The control device comprises a memory and a processor, the memory stores a computer program, and the computer program is executed by the processor to make the processor execute the steps of the temperature control method for material testing according to any one or more embodiments of the present application.

[0114] The heating device is used for heating the inner box and is connected with the control device.

[0115] The monitoring device is used for real-time monitoring of the temperature and is linked with the control device.

[0116] In the embodiment, as shown in Figure 7 The control device is connected with the heating device and the monitoring device respectively, the control device performs bidirectional data transmission with the heating device, and the control device performs bidirectional data transmission with the monitoring device.

[0117] Figure 8 An internal structure diagram of the control device in an embodiment is shown. As shown in Figure 8 The control device comprises a processor, a memory, a network interface, an input device and a display screen connected through a system bus. The memory comprises a non-volatile storage medium and an internal memory. The non-volatile storage medium of the control device stores an operating system and can also store a computer program, which, when executed by the processor, can make the processor implement the temperature control method for material testing provided by the embodiment. The internal memory can also store a computer program, which, when executed by the processor, can make the processor execute the temperature control method for material testing provided by the embodiment. The display screen of the control device can be a liquid crystal display screen or an electronic ink display screen, and the input device of the control device can be a touch layer overlaid on the display screen, or a key, trackball or touchpad arranged on the shell of the computer device, or an external keyboard, touchpad or mouse, etc.

[0118] Those skilled in the art can understand that Figure 8 The structure shown in the figure is only a block diagram of part of the structure related to the present application scheme, and does not constitute a limitation on the computer device to which the present application scheme is applied. The specific computer device can comprise more or fewer components than those shown in the figure, or combine certain components, or have a different component arrangement.

[0119] In one embodiment, the temperature control device for material testing provided by the embodiment of the present application can be realized in the form of a computer program, which can run on the control device as shown in Figure 8 The memory of the computer device can store various program modules constituting the temperature control device for material testing, such as Figure 6The diagram shows a heating module, a temperature monitoring module, a cooling module, a comparison module, and connection module one and connection module two. The computer program comprised of these modules causes the processor to execute the steps in the temperature control method for material testing according to various embodiments of the present invention described in this specification.

[0120] For example, Figure 8 The control device shown can be used as follows Figure 6 The temperature control device for material testing shown in the diagram executes step S1, controlling the heating wire to raise the inner chamber temperature to the first set temperature, and then disconnecting the power supply to the heating wire to stop heating; step S2 can be executed through the temperature monitoring module to monitor and record the inner chamber temperature, and generate a temperature curve based on the monitored inner chamber temperature; step S3 can be executed through the cooling module to lower the inner chamber temperature from the first set temperature to the current optimal temperature during the first cooling process, determine the duration t1 of the second cooling process based on the temperature curve, and allow the inner chamber temperature to undergo a second cooling process of duration t1 from the current optimal temperature. After the second cooling process ends, the power supply to the heating wire is turned on to execute S1; step S4 can be executed through the comparison module, repeating steps S1 to S3, comparing the current optimal temperature with the next optimal temperature at a time point b before the set stage transition time point a. If the current optimal temperature is less than the next optimal temperature, then step S5 is executed; if the current optimal temperature is less than the next optimal temperature, then step S5 is executed. If the temperature is greater than the optimal temperature for the next stage, then execute S6; Step S5 can be executed through the connecting module 1: Determine the average duration of the cycle of repeating steps S1 to S3 before time point b, determine the time difference dc between the end time d of the last cycle in the time period from time point b to switching time point c and switching time point c based on the average duration of the cycle, and adjust the duration of each cycle in the bd segment according to the time difference dc so that the temperature rises to the optimal temperature for the next stage at the set time point a; Step S6 can be executed through the connecting module 2: Determine the average cooling rate of the first cooling process of all cycles before time point b, determine a time difference dc based on the average cooling rate, the average duration of the cycle, the set stage connecting time point a and switching time point c, and distribute the time difference dc to each cycle in the bd segment, and adjust the relative angle between the sample chamber and the inner chamber so that the temperature of the inner chamber drops from the first set temperature according to the average cooling rate so that the temperature of the inner chamber drops to the optimal temperature for the next stage at the set time point a.

[0121] In one embodiment, a computer device is provided, the computer device including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the computer program, performs the following steps:

[0122] S1: controlling the heating wire to heat and make the inner box temperature rise to a first set temperature, and disconnecting the power supply of the heating wire to stop heating;

[0123] S2: monitoring and recording the inner box temperature, and generating a temperature curve according to the monitored inner box temperature;

[0124] S3: making the inner box temperature decrease from the first set temperature to an optimal temperature of a current stage in a first temperature decreasing process, determining a time length t1 of a second temperature decreasing process according to the temperature curve, making the inner box temperature experience the second temperature decreasing process with the time length t1 from the optimal temperature of the current stage, disconnecting the power supply of the heating wire after the second temperature decreasing process ends, and performing S1;

[0125] S4: repeating the steps S1 to S3 at a time point b which is a set time length before a stage connection time point a, comparing the optimal temperature of the current stage with an optimal temperature of a next stage, performing S5 if the optimal temperature of the current stage is less than the optimal temperature of the next stage, and performing S6 if the optimal temperature of the current stage is greater than the optimal temperature of the next stage;

[0126] S5: determining an average time length of a cycle of repeating the steps S1 to S3 before the time point b, determining a time difference dc between an end time d of a last cycle in a time period from the time point b to a switching time point c and the switching time point c according to the average time length of the cycle, and adjusting the time length of each cycle in the bd section according to the time difference dc to make the temperature rise to the optimal temperature of the next stage at the set time point a;

[0127] S6: determining an average temperature decreasing speed of the first temperature decreasing process of all cycles before the time point b, determining a time difference dc according to the average temperature decreasing speed, the average time length of the cycle, the set stage connection time point a and the switching time point c, and distributing the time difference dc to each cycle in the bd section, and adjusting the relative angle between the sample box and the inner box to make the inner box temperature decrease from the first set temperature according to the average temperature decreasing speed to make the inner box temperature decrease to the optimal temperature of the next stage at the set time point a.

[0128] In one embodiment, a computer readable storage medium is provided, and a computer program is stored on the computer readable storage medium. When the computer program is executed by a processor, the processor performs the following steps:

[0129] S1: controlling the heating wire to heat and make the inner box temperature rise to a first set temperature, and disconnecting the power supply of the heating wire to stop heating;

[0130] S2: monitoring and recording the inner box temperature, and generating a temperature curve according to the monitored inner box temperature;

[0131] S3: make the inner box temperature decrease from the first set temperature to the current stage optimal temperature in the first temperature decreasing process, determine the time length t1 of the second temperature decreasing process according to the temperature curve, make the inner box temperature experience the second temperature decreasing process with the time length t1 from the current stage optimal temperature, and turn on the power supply of the electric heating wire to execute S1 when the second temperature decreasing process ends;

[0132] S4: repeat the execution of steps S1 to S3 at a time point b which is a set time length before a stage connection time point a, compare the current stage optimal temperature with the next stage optimal temperature, execute S5 if the current stage optimal temperature is less than the next stage optimal temperature, and execute S6 if the current stage optimal temperature is greater than the next stage optimal temperature;

[0133] S5: determine the average time length of the cycle of repeating the execution of steps S1 to S3 before the time point b, determine the time difference dc between the end time d of the last cycle in the time period from the time point b to the switching time point c and the switching time point c according to the average time length of the cycle, and adjust the time length of each cycle in the bd period according to the time difference dc to make the temperature rise to the next stage optimal temperature at the set time point a;

[0134] S6: determine the average temperature decreasing speed of the first temperature decreasing process of all cycles before the time point b, determine a time difference dc according to the average temperature decreasing speed, the average time length of the cycle, the set stage connection time point a and the switching time point c, and distribute the time difference dc to each cycle in the bd period, and make the inner box temperature decrease from the first set temperature according to the average temperature decreasing speed by adjusting the relative angle between the sample box and the inner box to make the inner box temperature decrease to the next stage optimal temperature at the set time point a.

[0135] It should be understood that although each step in the flowchart of each embodiment of the present application is shown in sequence according to the arrow, these steps are not necessarily executed in the order indicated by the arrow. Unless otherwise specified herein, the execution of these steps is not strictly limited in sequence, and these steps can be executed in other orders. Moreover, at least a part of the steps in each embodiment can include multiple sub-steps or multiple stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution order of these sub-steps or stages is not necessarily sequential, but can be executed in rotation or alternation with at least a part of other steps or sub-steps or stages of other steps.

[0136] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by a computer program instructing relevant hardware, and the program can be stored in a non-volatile computer readable storage medium. When the program is executed, it can include the processes of the above-mentioned embodiment methods. Any reference to memory, storage, database or other medium used in the embodiments provided by the present application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration but not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0137] Any combination of the technical features of the above-mentioned embodiments can be combined, and in order to make the description simple, not all possible combinations of the technical features in the above-mentioned embodiments are described, however, as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the present application.

[0138] The above-mentioned embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the present application. It should be noted that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of the present application. Therefore, the scope of protection of the present application should be subject to the appended claims.

Claims

1. A temperature control method for material testing, characterized in that, The temperature control method for material testing includes: S1: Control the heating wire to raise the temperature of the inner chamber to the first set temperature, and then disconnect the power supply to the heating wire to stop heating; S2: Monitor and record the inner chamber temperature, and generate a temperature curve based on the monitored inner chamber temperature; S3: Reduce the inner chamber temperature from the first set temperature to the current optimal temperature during the first cooling process. Determine the duration t1 of the second cooling process based on the temperature curve. Allow the inner chamber temperature to undergo a second cooling process of duration t1 from the current optimal temperature. Once the second cooling process ends, turn on the power supply to the heating wire to execute S1. S4: During the repeated execution of steps S1 to S3, at the time point b, which is a set time interval before the set stage transition time point a, compare the current stage's optimal temperature with the next stage's optimal temperature. If the current stage's optimal temperature is less than the next stage's optimal temperature, then execute S5; if the current stage's optimal temperature is greater than the next stage's optimal temperature, then execute S6. S5: Determine the average duration of the cycle of repeating steps S1 to S3 before time point b. Based on the average duration of the cycle, determine the time difference dc between the end time d of the last cycle in the time period from time point b to switching time point c and switching time point c. Adjust the duration of each cycle in the bd segment based on the time difference dc so that the temperature rises to the optimal temperature of the next stage at the set time point a. S6: Determine the average cooling rate of the first cooling process of all cycles before time point b. Based on the average cooling rate, the average duration of the cycle, the set stage transition time point a and the switching time point c, determine a time difference dc. Distribute the time difference dc to each cycle within the bd segment. Adjust the relative angle between the sample chamber and the inner chamber to make the inner chamber temperature drop from the first set temperature according to the average cooling rate so that the inner chamber temperature drops to the optimal temperature of the next stage at the set time point a. The determination of the duration t1 of the second cooling process based on the temperature curve includes: Based on the generated temperature curve, calculate the integral of the temperature curve over time between the time point e when the inner chamber temperature rises to the current optimal temperature and the time point f when the temperature drops to the current optimal temperature within the current cycle. ; according to Determine the end time g of the second cooling process in the current cycle; The time interval between time point f and end time g is taken as the duration t1 of the second cooling process; In step 5, the average duration of the cycle of repeating steps S1 to S3 before determining time point b includes: Obtain the total number N of cycles in which steps S1 to S3 are repeated before time point b; Divide the total duration before time point b by N to obtain the average duration of the cycle before time point b. In step S5, determining the time difference dc between the end time d of the last cycle and the switching time point c within the time period from time point b to switching time point c based on the average duration of the cycle includes: Determine the lowest temperature of each cycle before time point b, and calculate the average of the lowest temperatures; Obtain the heating time from the lowest temperature to the first set temperature in each cycle before time point b, and calculate the average heating time. Calculate the temperature difference between the average of the lowest temperature and the first set temperature, and divide the temperature difference by the average of the heating time to obtain the heating rate; Calculate the time ac required to raise the temperature from the average of the lowest temperature to the next optimal temperature based on the heating rate; The switching time point c is determined based on the connection time point a and the duration ac; Subtract ac from the set duration ba to get the duration of segment bc; The number of complete cycles within the bc segment and the end time d of the last cycle are determined by dividing the bc segment duration by the average duration of the cycle. Calculate the time difference dc between the end time d of the calculation cycle and the switching time point c; In step S6, determining a time difference dc based on the average cooling rate, the average duration of the cycle, the set stage transition time point a, and the switching time point c includes: Determine the lowest temperature of each cycle before time point b, and calculate the average of the lowest temperatures; Obtain the heating time from the lowest temperature to the first set temperature in each cycle before time point b, and calculate the average heating time. Calculate the temperature difference between the average of the lowest temperature and the first set temperature, and divide the temperature difference by the average of the heating time to obtain the heating rate; Calculate the heating time ch required to raise the temperature from the average value of the lowest temperature to the first set temperature based on the heating rate; The required cooling time ha from the first set temperature to the next optimal temperature is determined based on the average cooling rate. The switching time point c is determined based on the connection time point a and ch, ha; Subtract the durations ch and ha from the set duration ba to obtain the duration of segment bc. Obtain the total number of cycles N1 in which steps S1 to S3 are repeated before time point b, and divide the total duration before time point b by N1 to obtain the average duration of the cycle before time point b. The number of complete cycles within the bc segment and the end time d of the last cycle are determined by dividing the duration of the bc segment by the average duration of the cycle. Calculate the time difference dc between the switching time point c and the cycle end time d; In step S6, the step of allocating the time difference value dc to each period within the bd time period includes: The time difference dc is evenly distributed among the cycles within the bd segment; Based on the allocation results, the duration of the second cooling process in each cycle is adjusted so that the end time d of the last cycle in segment bd coincides with the switching time point c.

2. The temperature control method for material testing according to claim 1, characterized in that, In step S5, adjusting the duration of each cycle within segment bd according to the time difference dc to raise the temperature to the optimal temperature for the next stage at the set time point a includes: The time difference dc is evenly distributed among the cycles within the bd segment; Based on the allocation results, the duration of the second cooling process in each cycle within the bd segment is adjusted so that the end time d of the last cycle within the bd segment coincides with the switching time point c. Heating begins at switching time point c, causing the inner chamber temperature to rise to the optimal temperature for the next stage at the set transition time.

3. The temperature control method for material testing according to claim 1, characterized in that, In step S6, the average cooling rate of the first cooling process in all cycles before time point b includes: Record the duration of the first cooling process in each cycle before time point b; Calculate the temperature difference between the first set temperature and the current optimal temperature; The cooling rate of the first cooling process in each cycle is obtained by dividing the calculated temperature difference by the duration of each first cooling process. The average cooling rate of the first cooling process is calculated from the cooling rate of the first cooling process in each cycle.

4. A temperature control device for material testing, characterized in that, The temperature control device for material testing includes: Heating module: The heating module is used to execute step S1, control the heating wire to heat up the inner box to the first set temperature, and disconnect the power supply of the heating wire to stop heating; Temperature monitoring module: The temperature monitoring module is used to execute step S2, monitor and record the inner box temperature, and generate a temperature curve based on the monitored inner box temperature; Cooling module: The cooling module is used to execute step S3, so that the inner box temperature drops from the first set temperature to the current optimal temperature in the first cooling process, and determines the duration t1 of the second cooling process according to the temperature curve, so that the inner box temperature undergoes the second cooling process of duration t1 from the current optimal temperature. After the second cooling process ends, the power supply of the heating wire is turned on to execute S1. Comparison module: The comparison module is used to compare the current optimal temperature with the next optimal temperature at time point b, which is a set time interval before the set stage connection time point a, during the repeated execution of steps S1 to S3. If the current optimal temperature is less than the next optimal temperature, then S5 is executed; if the current optimal temperature is greater than the next optimal temperature, then S6 is executed. Connection Module 1: The connection module 1 is used to execute step S5, determine the average duration of the cycle of repeating steps S1 to S3 before time point b, determine the time difference dc between the end time d of the last cycle in the time period from time point b to switching time point c and switching time point c based on the average duration of the cycle, and adjust the duration of each cycle in the bd segment according to the time difference dc so that the temperature rises to the optimal temperature of the next stage at the set time point a. Connection Module 2: The connection module 2 is used to execute step S6, determine the average cooling rate of the first cooling process of all cycles before time point b, determine a time difference dc based on the average cooling rate, the average duration of the cycle, the set stage connection time point a and the switching time point c, and distribute the time difference dc to each cycle within the bd segment. By adjusting the relative angle between the sample box and the inner box, the temperature of the inner box is made to decrease from the first set temperature according to the average cooling rate so that the temperature of the inner box drops to the optimal temperature of the next stage at the set time point a. The determination of the duration t1 of the second cooling process based on the temperature curve includes: Based on the generated temperature curve, calculate the integral of the temperature curve over time between the time point e when the inner chamber temperature rises to the current optimal temperature and the time point f when the temperature drops to the current optimal temperature within the current cycle. ; according to Determine the end time g of the second cooling process in the current cycle; The time interval between time point f and end time g is taken as the duration t1 of the second cooling process; In step 5, the average duration of the cycle of repeating steps S1 to S3 before determining time point b includes: Obtain the total number N of cycles in which steps S1 to S3 are repeated before time point b; Divide the total duration before time point b by N to obtain the average duration of the cycle before time point b. In step S5, determining the time difference dc between the end time d of the last cycle and the switching time point c within the time period from time point b to switching time point c based on the average duration of the cycle includes: Determine the lowest temperature of each cycle before time point b, and calculate the average of the lowest temperatures; Obtain the heating time from the lowest temperature to the first set temperature in each cycle before time point b, and calculate the average heating time. Calculate the temperature difference between the average of the lowest temperature and the first set temperature, and divide the temperature difference by the average of the heating time to obtain the heating rate; Calculate the time ac required to raise the temperature from the average of the lowest temperature to the next optimal temperature based on the heating rate; The switching time point c is determined based on the connection time point a and the duration ac; Subtract ac from the set duration ba to get the duration of segment bc; The number of complete cycles within the bc segment and the end time d of the last cycle are determined by dividing the bc segment duration by the average duration of the cycle. Calculate the time difference dc between the end time d of the calculation cycle and the switching time point c; In step S6, determining a time difference dc based on the average cooling rate, the average duration of the cycle, the set stage transition time point a, and the switching time point c includes: Determine the lowest temperature of each cycle before time point b, and calculate the average of the lowest temperatures; Obtain the heating time from the lowest temperature to the first set temperature in each cycle before time point b, and calculate the average heating time. Calculate the temperature difference between the average of the lowest temperature and the first set temperature, and divide the temperature difference by the average of the heating time to obtain the heating rate; Calculate the heating time ch required to raise the temperature from the average value of the lowest temperature to the first set temperature based on the heating rate; The required cooling time ha from the first set temperature to the next optimal temperature is determined based on the average cooling rate. The switching time point c is determined based on the connection time point a and ch, ha; Subtract the durations ch and ha from the set duration ba to obtain the duration of segment bc. Obtain the total number of cycles N1 in which steps S1 to S3 are repeated before time point b, and divide the total duration before time point b by N1 to obtain the average duration of the cycle before time point b. The number of complete cycles within the bc segment and the end time d of the last cycle are determined by dividing the duration of the bc segment by the average duration of the cycle. Calculate the time difference dc between the switching time point c and the cycle end time d.

5. A temperature control system for material testing, characterized in that, The temperature control system for material testing includes a control device, a heating device, and a monitoring device; The control device includes a memory and a processor. The memory stores a computer program. When the computer program is executed by the processor, the processor performs the steps of the temperature control method for material testing as described in any one of claims 1 to 3. The heating device is used to heat the inner box and is connected to the control device; The monitoring device is used for real-time temperature monitoring and is linked to the control device.

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