Temperature relay life test device and control method

Abstract

The application belongs to the field of temperature relay life test, and particularly relates to a temperature relay life test device and a control method, wherein the device comprises a PLC controller connected with a temperature detection circuit, a temperature relay action detection circuit, a heating module, a cooling module and an upper computer; the temperature detection circuit is used for converting the temperature signal on the surface of the temperature relay module into a voltage signal; the cooling module is used for cooling the temperature relay module; the heating module is used for heating the temperature relay module; the temperature relay module comprises multiple temperature relay samples and control switches; and the temperature relay action detection circuit is used for detecting the contact change of the temperature relay in the temperature relay module. The application can test multiple temperature relays simultaneously without increasing the current during the test.

Description

Technical Field

[0001] This invention belongs to the field of temperature relay life testing, specifically relating to a temperature relay life testing device and control method. Background Technology

[0002] A temperature relay is an automated device used for temperature monitoring and control. It senses changes in ambient temperature and controls the switching state of circuits to manage the temperature of equipment or systems. Temperature relays are widely used in aviation, aerospace, rail transportation, and new energy fields, where the reliability and lifespan of temperature relays are of paramount importance; substandard quality can lead to serious consequences.

[0003] In related technologies, the life test of temperature relays mainly adopts a single test, which involves continuously heating a temperature relay, then letting it cool down and then heating it again for testing. Each test is recorded once, or multiple temperature relays are tested simultaneously, and the number of times the temperature relay contacts operate is recorded when heating or cooling is performed at the same time.

[0004] For the aforementioned technologies, a single test requires a significant amount of time, while simultaneous testing increases the current in the test circuit, placing higher demands on the hardware equipment for testing the current. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a temperature relay life test device and control method, which can test multiple temperature relays at the same time without increasing the test current, and simultaneously heat and cool down each temperature relay to speed up the test.

[0006] A temperature relay life testing device, comprising:

[0007] Temperature detection circuit, temperature relay action detection circuit, heating module, cooling module, temperature relay module, PLC controller and host computer;

[0008] The PLC controller is connected to the temperature detection circuit, the temperature relay action detection circuit, the heating module, the cooling module, and the host computer, respectively.

[0009] The temperature relay action detection circuit is connected to the temperature relay module;

[0010] The temperature detection circuit is used to convert the temperature signal on the surface of the temperature relay module into a voltage signal.

[0011] The cooling module is used to cool the temperature relay module;

[0012] The heating module is used to heat the temperature relay module;

[0013] The temperature relay module includes multiple temperature relay test samples and a control switch;

[0014] The temperature relay action detection circuit is used to detect changes in the contacts of the temperature relay module, including contact opening and contact closing.

[0015] Optionally, the cooling module includes:

[0016] Several fans and ventilation ducts, with the fans respectively located at both ends of the ventilation ducts;

[0017] The temperature relay is located inside the ventilation duct;

[0018] Several fans blow air in the same direction;

[0019] The heating module is mounted on the temperature relay.

[0020] Optionally, the PLC controller includes an AI module, a DI module, and a DO module;

[0021] The AI ​​module is connected to the temperature detection circuit, the DI module is connected to the temperature relay action detection circuit, and the heating module, cooling module, and temperature detection circuit are all connected to the DO module.

[0022] The DI module is used to detect the hardware master on signal, the hardware master off signal and the temperature relay sample action signal. The DO module controls the start and stop of the heating module, the start and stop of the cooling module and whether the temperature relay action detection circuit is detected by controlling the multi-channel contactor coil switch.

[0023] The AI ​​module is used to collect the temperature value from the temperature relay module;

[0024] The DO module is connected to one end of the temperature detection circuit, and the other end of the temperature detection circuit is connected to the AI ​​module.

[0025] Optionally, the temperature relay action detection circuit includes:

[0026] First protective resistor, second protective resistor, and electromagnetic switch;

[0027] The first protective resistor is connected to one end of the electromagnetic switch, the other end of the electromagnetic switch is connected to one end of the temperature relay module, the other end of the temperature relay module is connected to the second protective resistor, and one end of the second protective resistor is grounded.

[0028] Optionally, the first and second protection resistors are adjustable resistors.

[0029] Optionally, the temperature detection circuit includes:

[0030] Current-limiting resistors and platinum resistance thermometers;

[0031] The platinum resistance thermometer and the current-limiting resistor are connected. One end of the current-limiting resistor is grounded, and one end of the platinum resistance thermometer is connected to the power supply. The current-limiting resistor and the platinum resistance thermometer are connected to the negative terminal of the AI ​​module, and the end of the platinum resistance thermometer connected to the power supply is connected to the positive terminal of the AI ​​module.

[0032] Optionally, one control switch can control one temperature relay or one switch can control multiple temperature relays.

[0033] A control method for a temperature relay life testing device includes:

[0034] Set the operating temperature and recovery temperature of the test sample using a temperature relay;

[0035] Set the number of test samples for the temperature relay to be tested simultaneously and close the corresponding control switch;

[0036] Determine whether a falling edge air-cooling signal has been received;

[0037] If a falling edge air-cooling signal is received, the heating module is activated to heat the temperature relay test samples being tested simultaneously until the temperature reaches the operating temperature. If a voltage signal is detected in the temperature relay operation detection circuit, the lifespan count of each temperature relay test sample is incremented by one.

[0038] When the temperature of all test samples of the temperature relays in the simultaneous experiment reaches the recovery temperature, the cooling module is activated to cool down the temperature relays in the simultaneous experiment to below the recovery temperature. When the voltage signal of the temperature relay action detection circuit is detected again, the life count of each temperature relay test sample is incremented by one, until the temperature of the test sample of the temperature relay drops to the recovery temperature and the voltage signal of the temperature relay action detection circuit can no longer be detected. The life count of each temperature relay test sample is then obtained.

[0039] The lifespan of each temperature relay was determined by statistically analyzing the number of lifespan cycles for each test sample.

[0040] A terminal device includes a memory and a processor. The memory stores a computer program that can run on the processor. When the processor loads and executes the computer program, it employs a control method for a temperature relay life test device.

[0041] A computer-readable storage medium storing a computer program, which, when loaded and executed by a processor, employs a control method for a temperature relay life testing device.

[0042] The beneficial effects of this invention are:

[0043] 1. During life testing, based on the current handling capacity of the current circuit, the corresponding number of control switches are closed. Then, a cooling module and a heating module are used to heat and cool the temperature relay test samples. First, a portion of the temperature relay test samples are closed, and the number of times they are heated is recorded. Then, the control switches of the other temperature relay test samples are closed until all the temperature relay control switches have been closed. Then, cooling is performed simultaneously. This cycle is repeated, and the number of contact actuations of the temperature relays is recorded until the temperature relays fail. Compared with traditional testing methods, this application can test multiple temperature relay test samples simultaneously and achieve the purpose of testing temperature relays in batches, reducing the overall current during testing.

[0044] 2. By setting the cooling device as a tubular structure and installing fans at both ends with the fans blowing in the same direction, the cooling speed is greatly improved, and the life test is accelerated.

[0045] 3. If multiple temperature relays are controlled by one control switch, first close one switch to heat up to the operating temperature, then open it. Close the other switches, and so on, until all temperature relays have completed the heating and closing process. Then cool down the relays and repeat the above operation. This improves testing efficiency, reduces the current of the entire testing circuit, reduces power loss, and extends the service life of the testing equipment. Attached Figure Description

[0046] Figure 1 This is a system block diagram of a temperature relay life testing device according to the present invention;

[0047] Figure 2 This is a schematic diagram of the cooling module of a temperature relay life testing device according to the present invention;

[0048] Figure 3 This is a schematic diagram of the main circuit for a temperature relay life test device according to the present invention.

[0049] Figure 4 This is a schematic diagram of the temperature relay operation detection circuit of a temperature relay life testing device according to the present invention;

[0050] Figure 5 This is a schematic diagram of the temperature detection circuit of a temperature relay life test device according to the present invention.

[0051] Explanation of reference numerals in the attached diagram: 1. Temperature detection circuit; 2. Temperature relay action detection circuit; 3. Heating module; 4. Cooling module; 5. Temperature relay module; 6. PLC controller; 7. Host computer; 8. AI module; 9. DI module; 10. DO module; 11. Ventilation duct; 12. Fan. Detailed Implementation

[0052] A temperature relay life testing device, such as Figure 1 As shown, the present invention includes:

[0053] Temperature detection circuit 1, temperature relay action detection circuit 2, heating module 3, cooling module 4, temperature relay module 5, PLC controller 6, and host computer 7;

[0054] Specifically, the host computer 7 control software programming interface and test status display interface communicate with the PLC, and after entering the monitoring mode, it displays the temperature relay action count counter status in real time.

[0055] The PLC controller 6 is connected to the temperature detection circuit 1, the temperature relay action detection circuit 2, the heating module 3, the cooling module 4, and the host computer 7, respectively.

[0056] The temperature relay action detection circuit 2 is connected to the temperature relay module 5;

[0057] The temperature detection circuit 1 is used to convert the temperature signal on the surface of the temperature relay module 5 into a voltage signal;

[0058] The cooling module 4 is used to cool the temperature relay module 5;

[0059] The heating module 3 is used to heat the temperature relay module 5;

[0060] Specifically, heating module 3 is equivalent to a resistor, consisting of a resistance wire and an aluminum shell, forming a flat surface. A temperature relay sample is placed on the upper surface, and a platinum resistance thermometer (e.g., PT100) is attached to the surface to detect changes in its surface temperature.

[0061] The temperature relay module 5 includes multiple temperature relay test samples and control switches;

[0062] Specifically, the temperature relays tested can be new products or in-service products, and the quantity is determined according to the life test requirements.

[0063] The temperature relay action detection circuit 2 is used to detect changes in the contacts of the temperature relay module 5, including contact opening and contact closing.

[0064] The power supply for the PLC controller 6 is 220V.

[0065] like Figure 2 As shown, the cooling module 4 includes:

[0066] A plurality of fans 12 and ventilation ducts 11 are provided, with the plurality of fans 12 respectively located at both ends of the ventilation ducts 11;

[0067] The temperature relay is located inside the ventilation duct 11;

[0068] Several fans 12 blow air in the same direction;

[0069] The heating module 3 is mounted on the temperature relay.

[0070] Specifically, the ventilation duct 11 can be rectangular in shape, with open ends. Fans 12 are installed at both ends of the ventilation duct 11, and all fans 12 direct the airflow in the same direction. The temperature relay test sample is placed inside the ventilation duct 11, and the heating module 3 is also installed within the temperature relay test sample. When heating is required, the heating module 3 is activated. When cooling is required, the fans 12 are activated, accelerating the cooling rate of the temperature relay test sample by blowing air through one end of the fan 12. The other end of the fan 12 can also quickly expel hot air, rapidly cooling and heating up, thus accelerating the lifespan test of the temperature relay test sample.

[0071] The PLC controller 6 includes an AI module 8, a DI module 9, and a DO module 10;

[0072] The AI ​​module 8 is connected to the temperature detection circuit 1, the DI module 9 is connected to the temperature relay action detection circuit 2, and the heating module 3, the cooling module 4, and the temperature detection circuit 1 are all connected to the DO module 10.

[0073] The DI module 9 is used to detect the hardware total on signal, the hardware total off signal and the temperature relay sample action signal. The DO module 10 controls the start and stop of the heating module 3, the start and stop of the cooling module 4 and whether the temperature relay action detection circuit 2 is detected by controlling the multi-channel contactor coil switch.

[0074] The AI ​​module 8 is used to collect the temperature value of the temperature relay module 5;

[0075] The DO module 10 is connected to one end of the temperature detection circuit 1, and the other end of the temperature detection circuit 1 is connected to the AI ​​module 8.

[0076] The circuit diagram of the temperature relay life test device is as follows: Figure 3As shown, it includes a current limiting switch, a first protective resistor, a second protective resistor, a multi-channel contactor coil switch, a heating module 3, a cooling module 4, and a temperature relay module 5;

[0077] One end of the current limiting switch is connected to the power supply, and the other end of the current limiting switch is connected to the multi-channel contactor coil switch and the first protective resistor. The multi-channel contactor coil switch is connected to the heating module 3, the cooling module 4 and the temperature relay test sample. The multi-channel contactor coil switch includes multiple switches, which control the start and stop of the heating module 3, the start and stop of the cooling module 4 and the connected temperature relay test sample, respectively. The temperature relay test sample is connected to the second protective resistor.

[0078] Only one type of circuit operates in the main circuit at any given time. Switching between different circuits is achieved by controlling the number of closed contactors in the multi-channel contactor coil switch. When the PLC controls the heating contactor in the multi-channel contactor coil switch to close via its coil, heating module 3 in the main circuit operates, rapidly heating the sample via the temperature relay. When the PLC controls the cooling contactor in the multi-channel contactor coil switch to close via its coil, cooling module operates, rapidly cooling the sample. Once the operating temperature is reached, the PLC controls the sample circuit contactor in the multi-channel contactor coil switch to close via its coil. At this time, the sample action detection circuit operates. When the DI module 9 detects a voltage change, the internal counter of the PLC controller 6 counts the sample actions. When heating module 3 operates, the current is determined by the resistive heating wire. When the air-cooling circuit operates, the current is determined by the current-limiting resistor and the operating current of multiple small fans. When the temperature relay sample closes, the multi-channel contactor detects the temperature relay closure through time-division multiplexing. The current is determined by the number of closed contactors connected to the sample in the multi-channel contactor coil switch. The current-limiting switch can be selected based on the maximum current of the three circuits operating.

[0079] The heating wire in heating module 3 can be designed according to the application conditions of the temperature relay test sample (such as operating temperature and installation method).

[0080] The temperature relay is designed for the sample's operating circuit, with electrical stress determined based on actual application conditions. The first protective resistor R1 (adjustable, and together with the second protective resistor R2 as current-limiting resistors) in the diagram serves a current-limiting function. The second protective resistor R2 (adjustable, but must ensure the PLC can detect the voltage signal; the detectable voltage range is 20-28V) ensures the PLC controller can detect a valid voltage signal after the temperature relay actuates. A multi-channel contactor coil switch is used; different contactor specifications can be selected based on the current-limiting requirements.

[0081] The principle of the detection and control circuit of the main circuit for the life test of the temperature relay is as follows: Figure 4As shown. The PLC in this invention requires modules including a power supply module, a CPU module, a DI module 9, a DO module 10, and an AI module 8. The DI module 9 is used to detect the hardware master on signal, the hardware master off signal, and the temperature relay sample action signal; the DO module 10 controls the start and stop of the heating module 3, the start and stop of the cooling module 4, and whether the sample working circuit is being detected by controlling the multi-channel contactor coil switch.

[0082] The process of DI module 9 detecting the number of times the temperature relay operates: The PLC continuously monitors the surface temperature of the temperature relay. When the temperature reaches the upper limit of the operating temperature, DI module 9 starts to detect whether the sample is closed. Before the sample operates, the terminal input voltage of DI module 9 is the voltage at the end of the second protection resistor R2, which is 0V. At this time, the internal counter of the PLC does not generate a count. After the sample operates, the voltage at the end of the second protection resistor R2 is about 24V, and the internal counter of the PLC generates a count.

[0083] DO module 10 control process: The PLC continuously monitors the surface temperature of the temperature relay. When the temperature is lower than the upper limit of the sample operating temperature, the PLC controls the multi-channel contactor coil switch through DO module 10, and the heating contactor closes to keep the heating module 3 heating continuously. When the temperature reaches the upper limit of the sample operating temperature, the PLC controls the heating contactor to open through DO module 10 to stop the heating module 3 from heating. Then, the contactors in the circuit where the sample is located are closed in sequence. DI module 9 detects whether the sample is closed. After all samples are detected, the PLC controls the contactor in the circuit where the cooling module 4 is located through the multi-channel contactor coil of DO module 10 to close and turn on the cooling module. When the sample surface temperature is lower than the lower limit of the recovery temperature, the PLC controls the multi-channel contactor coil in the circuit where the sample is located to open and stop the cooling module 4 from cooling.

[0084] AI module 8 temperature detection process: The platinum resistance in temperature detection loop 1 is in close contact with the upper surface of heating module 3. As the temperature changes, the resistance of the platinum resistance changes, and the voltage across its terminals also changes. AI module 8 collects the voltage across the platinum resistance at 20us intervals. That is, the PLC uses the voltage value across the platinum resistance collected by AI module 8 to match the temperature value of the sample surface, thereby realizing the control of the sample test temperature.

[0085] like Figure 4 As shown, the temperature relay action detection circuit 2 includes:

[0086] First protective resistor, second protective resistor, and electromagnetic switch;

[0087] The first protective resistor is connected to one end of the electromagnetic switch, the other end of the electromagnetic switch is connected to one end of the temperature relay module 5, the other end of the temperature relay module 5 is connected to the second protective resistor, one end of the second protective resistor is grounded, the first protective resistor and the second protective resistor are adjustable resistors, and the electromagnetic switch controls the on / off state of the entire temperature relay action detection circuit.

[0088] like Figure 5 As shown, the temperature detection circuit 1 includes:

[0089] Current-limiting resistors and platinum resistance thermometers;

[0090] The platinum resistance thermometer and the current-limiting resistor are connected. One end of the current-limiting resistor is grounded, and one end of the platinum resistance thermometer is connected to the power supply. The current-limiting resistor and the platinum resistance thermometer are connected to the negative terminal of the AI ​​module 8, and the end of the platinum resistance thermometer connected to the power supply is connected to the positive terminal of the AI ​​module 8.

[0091] A control method for a temperature relay life testing device includes:

[0092] Set the operating temperature and recovery temperature of the test sample using a temperature relay;

[0093] Specifically, in this embodiment, the contacts of the temperature relay are normally open by default. The operating temperature is the closing temperature of the test sample contacts of the temperature relay, and the recovery temperature is the opening temperature of the test sample contacts of the temperature relay. When the temperature reaches the operating temperature, the contacts of the temperature relay close, and when the recovery temperature is reached, the contacts open.

[0094] Set the number of test samples for the temperature relay to be tested simultaneously and close the corresponding control switch;

[0095] Specifically, if there are 20 temperature relay test samples, conducting experiments simultaneously would require a large current. Therefore, testing the 20 temperature relay test samples in batches, for example, testing 4 samples at a time, divided into 5 groups, will significantly reduce the current during testing and improve safety. This can be controlled by multiple switches included in a multi-channel contactor coil switch; one switch can control one temperature relay test sample, or one switch can control multiple temperature relay test samples.

[0096] Determine whether a falling edge air-cooling signal has been received;

[0097] Specifically, the falling edge of the air-cooling signal controls the cooling module to stop working.

[0098] If a falling edge cooling signal is received, the heating module is activated to heat the temperature relay test samples being tested simultaneously until the temperature reaches the operating temperature. If a voltage signal is detected in the temperature relay operation detection circuit, the lifespan count of each temperature relay test sample is incremented by one.

[0099] Specifically, after receiving the falling edge air-cooling signal, the cooling module is not working at this time. The heating module is then activated to heat the temperature relay test sample. When the temperature reaches the operating temperature, the normally open contact of the temperature relay test sample closes, making the temperature relay action detection circuit conduct. Therefore, a voltage signal can be detected, and the lifespan count is incremented by 1.

[0100] When the temperature of all test samples of the temperature relays in the simultaneous experiment reaches the recovery temperature, the cooling module is activated to cool the temperature relays below the recovery temperature. When the voltage signal of the temperature relay action detection circuit is detected again, the lifespan count of each temperature relay test sample is incremented by one, until the temperature of the test sample of the temperature relay drops to the recovery temperature and the voltage signal of the temperature relay action detection circuit can no longer be detected. The lifespan count of each temperature relay test sample is then obtained.

[0101] Specifically, after the operating temperature is reached, the heating module continues heating. Upon reaching the recovery temperature, the contacts of the temperature relay test sample open, and the cooling module activates, causing the temperature of the temperature relay test sample to decrease. When the temperature drops below the recovery temperature, the contacts of the temperature relay test sample close again, and the lifespan is incremented by one, repeating the cycle. It is important to note that since multiple temperature relay test samples are tested simultaneously, both heating and cooling require all temperature relay test samples to reach the set temperature before the corresponding action is executed. Finally, if a temperature relay fails to operate upon reaching its operating temperature, it indicates that the temperature relay has failed. The lifespan of this temperature relay is then recorded as the number of lifespans it has accumulated at that moment.

[0102] To achieve more efficient testing, multiple temperature relay test samples are controlled by a single control switch. Assuming four are controlled at a time, for a total of eight, the first four temperature relay test samples are heated first, then the switch is turned off, and the remaining four temperature relay test samples are turned on. The same process is then performed to cool them down. This operation is repeated to improve testing efficiency and reduce the overall current.

[0103] The lifespan of each temperature relay was determined by statistically analyzing the number of lifespan cycles for each test sample.

[0104] Specifically, after testing all the temperature relays, the lifespan data of all the temperature relays is statistically analyzed. Some data with large errors are removed, and the remaining data can be averaged or statistically analyzed. The lifespan of the temperature relay is determined based on the distribution of the number of lifespan tests.

[0105] This application also discloses a terminal device, including a memory and a processor. The memory stores a computer program that can run on the processor. When the processor loads and executes the computer program, a control method for a temperature relay life test device is used.

[0106] The terminal device can be a computer device such as a desktop computer, a laptop computer, or a cloud server. The terminal device includes, but is not limited to, a processor and a memory. For example, the terminal device may also include input / output devices, network access devices, and buses.

[0107] The processor can be a central processing unit (CPU). Of course, depending on the actual use, it can also be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), off-the-shelf programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor, etc., and this application does not limit it in this regard.

[0108] The memory can be an internal storage unit of the terminal device, such as a hard disk or RAM of the terminal device, or an external storage device of the terminal device, such as a plug-in hard disk, smart memory card (SMC), secure digital card (SD), or flash memory card (FC) equipped on the terminal device. Furthermore, the memory can be a combination of internal storage units and external storage devices of the terminal device. The memory is used to store computer programs and other programs and data required by the terminal device. The memory can also be used to temporarily store data that has been output or will be output. This application does not limit this.

[0109] In this terminal device, the control method of a temperature relay life test device in the above embodiment is stored in the memory of the terminal device and loaded and executed on the processor of the terminal device for convenient use.

[0110] This application also discloses a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, it employs a control method for a temperature relay life testing device as described in the above embodiments.

[0111] The computer program can be stored in a computer-readable medium. The computer program includes computer program code, which can be in the form of source code, object code, executable file, or certain middleware. The computer-readable medium includes any entity or device capable of carrying computer program code, recording media, USB flash drive, portable hard drive, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc. It should be noted that the computer-readable medium includes, but is not limited to, the above-mentioned components.

[0112] The control method of a temperature relay life test device in the above embodiments is stored in the computer-readable storage medium and loaded and executed on the processor to facilitate the storage and application of the above method.

[0113] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of protection of this application is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of one or more embodiments of this application as described above, which are not provided in detail for the sake of brevity.

[0114] One or more embodiments in this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of this application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments in this application should be included within the protection scope of this application.

Claims

1. A temperature relay life testing device, characterized in that, include: Temperature detection circuit, temperature relay action detection circuit, heating module, cooling module, temperature relay module, PLC controller and host computer; The PLC controller is connected to the temperature detection circuit, the temperature relay action detection circuit, the heating module, the cooling module, and the host computer, respectively. The temperature relay action detection circuit is connected to the temperature relay module; The temperature detection circuit is used to convert the temperature signal on the surface of the temperature relay module into a voltage signal. The cooling module is used to cool the temperature relay module; The heating module is used to heat the temperature relay module; The temperature relay module includes multiple temperature relay test samples and a control switch; The temperature relay action detection circuit is used to detect changes in the contacts of the temperature relay in the temperature relay module, including contact opening and contact closing.

2. The temperature relay life testing device as described in claim 1, characterized in that, The cooling module includes: Several fans and ventilation ducts, with the fans respectively located at both ends of the ventilation ducts; The temperature relay is located inside the ventilation duct; Several fans blow air in the same direction; The heating module is mounted on the temperature relay.

3. The temperature relay life testing device as described in claim 1, characterized in that, include: The PLC controller includes an AI module, a DI module, and a DO module; The AI ​​module is connected to the temperature detection circuit, the DI module is connected to the temperature relay action detection circuit, and the heating module, cooling module, and temperature detection circuit are all connected to the DO module. The DI module is used to detect the hardware master on signal, the hardware master off signal and the temperature relay sample action signal. The DO module controls the start and stop of the heating module, the start and stop of the cooling module and whether the temperature relay action detection circuit is detected by controlling the multi-channel contactor coil switch. The AI ​​module is used to collect the temperature value from the temperature relay module; The DO module is connected to one end of the temperature detection circuit, and the other end of the temperature detection circuit is connected to the AI ​​module.

4. The temperature relay life testing device as described in claim 1, characterized in that, The temperature relay activation detection circuit includes: First protective resistor, second protective resistor, and electromagnetic switch; The first protective resistor is connected to one end of the electromagnetic switch, the other end of the electromagnetic switch is connected to one end of the temperature relay module, the other end of the temperature relay module is connected to the second protective resistor, and one end of the second protective resistor is grounded.

5. The temperature relay life testing device as described in claim 4, characterized in that, The first and second protection resistors are adjustable resistors.

6. The temperature relay life testing device as described in claim 1, characterized in that, The temperature detection circuit includes: Current-limiting resistors and platinum resistance thermometers; The platinum resistance thermometer and the current-limiting resistor are connected. One end of the current-limiting resistor is grounded, and one end of the platinum resistance thermometer is connected to the power supply. The current-limiting resistor and the platinum resistance thermometer are connected to the negative terminal of the AI ​​module, and the end of the platinum resistance thermometer connected to the power supply is connected to the positive terminal of the AI ​​module.

7. The temperature relay life testing device as described in claim 1, characterized in that, One control switch controls one temperature relay or one switch controls multiple temperature relays.

8. A control method for a temperature relay life testing device, applied to the testing device as described in any one of claims 1-7, characterized in that, include: Set the operating temperature and recovery temperature of the test sample using a temperature relay; Set the number of test samples for the temperature relay to be tested simultaneously and close the corresponding control switch; Determine whether a falling edge air-cooling signal has been received; If a falling edge air-cooling signal is received, the heating module is activated to heat the temperature relay test samples being tested simultaneously until the temperature reaches the operating temperature. If a voltage signal is detected in the temperature relay operation detection circuit, the lifespan count of each temperature relay test sample is incremented by one. When the temperature of all test samples of the temperature relays in the simultaneous experiment reaches the recovery temperature, the cooling module is activated to cool down the temperature relays in the simultaneous experiment to below the recovery temperature. When the voltage signal of the temperature relay action detection circuit is detected again, the life count of each temperature relay test sample is incremented by one, until the temperature of the test sample of the temperature relay drops to the recovery temperature and the voltage signal of the temperature relay action detection circuit can no longer be detected. The life count of each temperature relay test sample is then obtained. The lifespan of each temperature relay was determined by statistically analyzing the number of lifespan cycles for each test sample.

9. A terminal device, comprising a memory and a processor, characterized in that, The memory stores a computer program that can run on a processor, and when the processor loads and executes the computer program, it employs the method described in any one of claims 1 to 8.

10. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is loaded and executed by the processor, it employs the method described in any one of claims 1 to 8.

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