A portable multi-functional tester for electric tea stoves in railway passenger cars

Abstract

This invention discloses a portable multi-functional tester for electric tea stoves in railway passenger cars, belonging to the technical field of multi-functional testers. It includes a communication interface, a conversion module, an analog potentiometer, and a PLC control unit. The communication interface is compatible with the motherboard interface, used to receive input signals from the electric tea stove and transmit output signals to the motherboard; the conversion module is used to convert the sensing signal of the anti-dry-burning sensor into a voltage signal; the input signal includes at least the sensing signal of the anti-dry-burning sensor; the analog potentiometer is used to provide different resistance values; when the communication interface is connected to the motherboard interface, the analog potentiometer is connected in parallel with the anti-dry-burning sensor; the output signal includes at least the sensing signal of the anti-dry-burning sensor simulated by the PLC control unit; the PLC control unit is used to convert the voltage signal into a digital temperature signal and send sensing signals to the motherboard, simulating the anti-dry-burning sensor sending sensing signals to the motherboard. This invention improves the safety and accuracy of the multi-functional tester.

Description

Technical Field

[0001] This invention relates to the field of multifunctional testing instruments, and in particular to a portable multifunctional testing instrument for electric tea stoves in railway passenger cars. Background Technology

[0002] Traditional testing instruments, when testing the anti-dry-burning function of electric tea stoves, use a signal cable design from the anti-dry-burning sensor to the main control board. This means that the signal cable connects the anti-dry-burning sensor and the main control board without connectors or transition terminals (for example, the WSD-98 electric tea stove uses a connector assembly design from the anti-dry-burning sensor to the main control board, without connectors or terminals). If the operator wants to use the "parallel resistance testing" method, they have to strip the insulation layer of the signal cable to expose the wire core and then connect a test resistor in parallel to simulate the test.

[0003] Taking the WSD-98 electric tea stove as an example, its anti-dry-burning sensor uses a negative temperature coefficient NTC (thermistor, R25=100K, B25 / 50=3950K). The operator needs to strip the insulation layer of the signal cable and connect a 3.9KΩ±10% resistor to simulate and test the function of the anti-dry-burning sensor and the anti-dry-burning function of the electric tea stove.

[0004] Specifically, when simulating the testing of the electric tea stove's anti-dry-burning function and sensor, the operator opens the stove's casing, connects a 3.9KΩ±10% resistor, and then powers on the stove for heating (without adding water). After a period of time, if the stove does not automatically power off and stop heating, it indicates that the anti-dry-burning function is faulty. It should be noted that the electric tea stove has "Power," "Heating," and "Water Shortage" indicator lights to indicate the operation being performed. Under normal circumstances, these three indicator lights will not all be lit simultaneously. When the "Water Shortage" indicator light is on, the stove will switch to water shortage protection mode, i.e., the anti-dry-burning function, and the stove will not heat. Therefore, after connecting the resistor and allowing the stove to dry-burn, observe whether the water shortage indicator light illuminates after a period of time. If it illuminates, it indicates that the anti-dry-burning function is not faulty; otherwise, it indicates that the anti-dry-burning function is faulty.

[0005] Then, add an appropriate amount of water to the electric tea stove and continue heating. Keep the outer casing of the electric tea stove open and observe whether the anti-dry-burning red light on the main board of the electric tea stove is lit. If it is lit, it indicates that the main board has activated the anti-dry-burning protection. After the anti-dry-burning protection is activated, the electric tea stove stops heating. In this scenario, the main board executes the anti-dry-burning protection action based on the sensing signal of the anti-dry-burning sensor. Therefore, if the anti-dry-burning red light is lit, it also proves that the anti-dry-burning sensor is not faulty, but it is uncertain whether the temperature detected by the anti-dry-burning sensor is accurate. Of course, if it is not lit, it proves that the anti-dry-burning sensor may be damaged, or the anti-dry-burning function of the electric tea stove main board (especially the anti-dry-burning function control circuit) is damaged.

[0006] Further investigation was conducted to determine if the anti-dry-burning sensor was faulty: the water in the electric tea stove's water tank was emptied and the water was heated. If the electric tea stove automatically shut off and stopped heating, it proved that the anti-dry-burning function of the electric tea stove's main board was normal, thus confirming that the anti-dry-burning sensor was faulty; if the electric tea stove did not automatically shut off and stop heating, it proved that the anti-dry-burning function control circuit of the electric tea stove was faulty.

[0007] Additionally, by connecting the resistor in parallel with the anti-dry-burn sensor (NTC), the real-time resistance and temperature of the NTC can be measured. Taking an NTC with 25 = 100K and B25 / 50 = 3950K as an example, after connecting a resistor of 3.9KΩ ± 10% in parallel, the parallel resistance at 25℃ can be calculated to be approximately 2805Ω using the parallel resistor formula. At different temperatures, the resistance of the thermistor will change, and the parallel resistance will also change. Given the parallel resistance, the real-time resistance of the NTC can be calculated using the parallel resistor formula. Then, based on the NTC's parameters (which characterize the relationship between real-time resistance and real-time temperature), the real-time temperature of the NTC can be calculated. The real-time temperature of the NTC is then compared with the temperature displayed on the electric kettle's temperature display. If the temperature difference is within an acceptable range, it indicates that the anti-dry-burn sensor is working properly and detecting the temperature accurately; otherwise, it indicates that the anti-dry-burn sensor is not detecting the temperature accurately.

[0008] The above detection method has the following problems:

[0009] 1. Because this testing method requires stripping the insulation layer for parallel connection, it results in poor maintenance procedures, low safety, and poses certain equipment safety hazards and operational risks to railway passenger cars. Furthermore, the connection lines are complex.

[0010] The NTC temperature rise of 2.3950K is relatively large, with a difference of 23KΩ between 0℃ and 30℃. This results in a large difference in the static initial value under different ambient temperatures. Therefore, using only a fixed resistor of 3.9KΩ±10% leads to inaccurate test results. Summary of the Invention

[0011] The purpose of this invention is to provide a portable multi-functional testing instrument for electric tea stoves in railway passenger cars, which improves the safety and accuracy of the multi-functional testing instrument.

[0012] To achieve the above objectives, embodiments of the present invention provide the following solutions:

[0013] A portable multi-functional detector for electric tea stoves in railway passenger cars, wherein the electric tea stove includes an anti-dry-burning sensor and a main board, the anti-dry-burning sensor being connected to the interface of the main board via a connecting cable, comprising:

[0014] A communication interface adapted to the interface of the motherboard, the communication interface integrating multiple connection cables for receiving input signals from the electric tea stove and transmitting output signals to the motherboard;

[0015] The conversion module is connected to the communication interface via a connecting cable and is used to convert the sensing signal of the anti-dry-burning sensor into a voltage signal; the input signal includes at least the sensing signal of the anti-dry-burning sensor.

[0016] An analog potentiometer is connected to the conversion module. When the communication interface is connected to the interface of the motherboard, the analog potentiometer is connected in parallel with the anti-dry-burning sensor.

[0017] The PLC control unit is connected to the conversion module, the analog potentiometer, and the communication interface respectively, and is used for:

[0018] The voltage signal is converted into a digital temperature signal;

[0019] The analog potentiometer is controlled to provide different resistance values;

[0020] The PLC control unit sends a sensing signal to the motherboard via the communication interface to simulate the anti-dry-burning sensor sending a sensing signal to the motherboard; wherein the digital temperature signal is used to display the temperature value on the screen; the output signal includes at least the sensing signal sent by the PLC control unit to the motherboard in the simulated manner by the anti-dry-burning sensor.

[0021] Optionally, the screen is connected to the PLC control unit, and the screen is used to display the digital temperature signal.

[0022] Optionally, it also includes: a voltage detection relay;

[0023] The voltage detection relay is connected to the communication interface and is used to convert the analog voltage signals of each indicator light of the electric tea stove into switching signals; the input signal includes the analog voltage signals of each indicator light.

[0024] Optionally, the voltage detection relay is connected to the PLC control unit, and the PLC control unit converts the switching quantity into status information of each indicator light; the status information is used to display on the screen.

[0025] Optionally, it also includes:

[0026] A storage module, connected to the PLC control unit, is used to store at least the digital temperature signal.

[0027] Optionally, it also includes:

[0028] An alarm module, connected to the PLC control unit, is used to issue an alarm based on control signals;

[0029] The PLC control unit is also used to issue the control signal when the duration of the electric tea stove heating state exceeds a threshold time and / or when the temperature value exceeds a threshold temperature.

[0030] Optionally, the PLC control unit has a signal interface; the signal interface is at least used to receive the switching signal from the voltage detection relay and the sensing signal from the anti-dry-burning sensor.

[0031] Optionally, the PLC control unit is also used to send a water level sensing signal to the motherboard through the communication interface to simulate the water level sensing signal emitted by the water level sensor at different water level extremes; the water level sensor belongs to the electric tea stove; the output signal further includes: the PLC control unit simulating the water level sensing signal emitted by the water level sensor.

[0032] Optionally, it includes:

[0033] The power supply module is connected to other components in the detector to supply power to those components; the other components include at least: the PLC control unit, the conversion module, the screen, and the voltage detection relay.

[0034] According to specific embodiments provided by the present invention, the following technical effects are disclosed:

[0035] This invention provides a portable multi-functional tester for electric tea stoves in railway passenger cars. The multi-functional tester includes a communication interface, a conversion module, an analog potentiometer, and a PLC control unit. The communication interface is compatible with the motherboard interface and integrates multiple connection cables, enabling it to receive input signals from the electric tea stove and transmit output signals to the motherboard.

[0036] The aforementioned analog potentiometer functions similarly to a fixed resistor in existing technology. During simulation testing, the communication interface can be connected to the interface on the electric kettle's main board. The analog potentiometer can then be connected in parallel with the anti-dry-burning sensor via the connection cable in the communication interface. Since parallel connection can be achieved simply by connecting the communication interface directly to the electric kettle's main board, it avoids stripping the insulation layer of the signal cable, thus improving the safety of maintenance work.

[0037] Meanwhile, since the aforementioned analog potentiometer can provide different resistance values, it can support the use of different resistance values ​​for analog testing compared to simply using a fixed 3.9KΩ±10% resistor in parallel, thus improving the accuracy of the test results.

[0038] Specifically, when using the aforementioned tester to simulate and test the anti-dry-burning sensor function, the communication interface can be connected to the interface of the electric tea stove's main board. Water can then be added to the electric tea stove and heated. The various components of the tester work together as follows: the conversion module converts the sensing signal from the anti-dry-burning sensor into a voltage signal, and the PLC control unit converts the voltage signal into a digital temperature signal that can be displayed on the screen. If there is no digital temperature signal, it proves that the anti-dry-burning sensor is damaged; if there is a digital temperature signal, it proves that the anti-dry-burning sensor is not damaged.

[0039] Alternatively, the resistance value provided by the analog potentiometer can be adjusted. After obtaining the parallel resistance value of the analog potentiometer and the NTC in the anti-dry-burning sensor, the real-time resistance value of the NTC can be calculated backwards using the parallel resistance formula. Then, the real-time temperature of the NTC can be calculated based on the real-time resistance value. The calculated real-time temperature is then compared with the temperature represented by the digital temperature signal. If the temperature difference is within an acceptable range, it indicates that the anti-dry-burning sensor is working properly and detecting the temperature accurately; otherwise, it indicates that the anti-dry-burning sensor is not detecting the temperature accurately.

[0040] When using the above-mentioned testing instrument to simulate the anti-dry-burning function of the electric tea stove, the electric tea stove can be emptied and heated. The various components of the testing instrument work together as follows: the PLC control unit sends a sensing signal to the main board through the communication interface to simulate the anti-dry-burning sensor sending a sensing signal to the main board. If the electric tea stove automatically cuts off the power and stops heating, it proves that the anti-dry-burning function of the electric tea stove is normal; otherwise, it proves that the anti-dry-burning function of the electric tea stove is not normal. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 A schematic diagram of the structure of a portable multi-functional detector for electric tea stoves in railway passenger cars provided in an embodiment of the present invention;

[0043] Figure 2 A schematic diagram illustrating the operation of a portable multi-functional detector for electric tea stoves in railway passenger cars, provided as an embodiment of the present invention;

[0044] Figure 3 An electrical schematic diagram of a portable multi-functional tester for electric tea stoves in railway passenger cars, provided in an embodiment of the present invention;

[0045] Figure 4 A schematic diagram of the real-time temperature display for preventing dry burning of a portable multi-functional detector for electric tea stoves in railway passenger cars, provided in an embodiment of the present invention;

[0046] Figure 5 A schematic diagram illustrating the function selection of a portable multi-functional tester for electric tea stoves in railway passenger cars, provided in an embodiment of the present invention;

[0047] Figure 6 This is a schematic diagram illustrating the anti-dry-burning access mode setting of a portable multi-functional detector for electric tea stoves in railway passenger cars, provided in an embodiment of the present invention.

[0048] Figure 7 This is a schematic diagram of the indicator light status of an electric tea stove in a portable multi-functional detector for electric tea stoves in railway passenger cars, provided in an embodiment of the present invention.

[0049] Figure 8 This is a schematic diagram of historical data from a portable multi-functional detector for electric tea stoves in railway passenger cars, provided in an embodiment of the present invention.

[0050] Figure 9 This invention provides an alarm display diagram of a portable multi-functional detector for electric tea stoves in railway passenger cars.

[0051] Figure 10 This is a schematic diagram illustrating the water level pole access mode setting of a portable multi-functional detector for electric tea stoves in railway passenger cars, provided in an embodiment of the present invention.

[0052] Figure 11 This is a schematic diagram of simulated pole connection for a portable multi-functional tester for electric tea stoves in railway passenger cars, provided as an embodiment of the present invention.

[0053] Symbol explanation:

[0054] Communication interface-1, conversion module-2, analog potentiometer-3, PLC control unit-4, screen-5, voltage detection relay-6, storage module-7, alarm module-8, and power supply module-9. Detailed Implementation

[0055] The structures and scenarios described in the embodiments of this application are for the purpose of more clearly illustrating the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided in the embodiments of this application. As those skilled in the art will know, with the emergence of new scenarios, the technical solutions provided in the embodiments of this application are also applicable to similar technical problems.

[0056] It should be noted that, in this application, the terms "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in this application should not be construed as being more preferred or advantageous than other embodiments or design solutions. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0057] The purpose of this invention is to provide a portable multi-functional tester for electric tea stoves in railway passenger cars, which solves the problem that it is necessary to strip the insulation layer of the signal cable to connect a resistor in parallel, and that using only a fixed resistor leads to inaccurate test results, thereby improving the safety and accuracy of the multi-functional tester.

[0058] Figure 1 An exemplary structure of the aforementioned portable railway passenger car electric tea stove multi-functional detector is shown, including a communication interface 1, a conversion module 2, an analog potentiometer 3, and a PLC control unit 4.

[0059] In other embodiments of the present invention, the above-mentioned multifunctional detector may further include a screen 5. The screen 5 is connected to the PLC control unit 4 and is used at least to display digital temperature.

[0060] Of course, in other embodiments of the present invention, the PLC control unit 4 can also be connected to the screen of other devices to achieve the same display function.

[0061] In other embodiments of the present invention, the multifunctional detector in all the above embodiments may further include at least one of voltage detection relay 6, storage module 7, alarm module 8 and power supply module 9.

[0062] They will be introduced separately below:

[0063] Communication interface 1 is compatible with the interface of the electric tea stove motherboard. Communication interface 1 integrates multiple connecting cables for receiving input signals from the electric tea stove and transmitting output signals to the electric tea stove motherboard.

[0064] Alternatively, the input signal from the electric tea stove can be transmitted to the multi-functional detector via communication interface 1, and the output signal generated by the multi-functional detector can be transmitted to the main board of the electric tea stove via communication interface 1.

[0065] In one example, see Figure 3 ( Figure 3(This is the electrical schematic diagram of a multi-functional detector). The communication interface 1 may further include: an input plug-in and an output plug-in, both of which integrate multiple connecting lines.

[0066] The input module is used to receive input signals from the electric kettle, and the output module is used to transmit output signals to the motherboard.

[0067] The input signal includes at least the sensing signal from the anti-dry-burning sensor. Specifically, the sensing signal can be a current signal, a voltage signal, a resistance signal, etc.

[0068] The input and output plug-ins can specifically use the DB-15 connector interface.

[0069] The conversion module 2 is connected to the communication interface 1 via a connecting cable. The conversion module 2 is used at least to convert the sensing signal of the anti-dry burning sensor into a voltage signal.

[0070] In one example, conversion module 2 may specifically be an NTC signal detection conversion module / board.

[0071] Please see again Figure 1 Analog potentiometer 3 is connected to conversion module 2 and is used to provide different resistance values. When communication interface 1 is connected to the motherboard interface, analog potentiometer 3 is connected in parallel with the anti-dry-burning sensor to output a signal. For example, analog potentiometer 3 can specifically be a resistor with a variable resistance value.

[0072] There are several ways to connect the analog potentiometer 3 in parallel with the anti-dry-burning sensor. For example, when the communication interface 1 is connected to the motherboard interface, the two ends of the anti-dry-burning sensor can be connected to the two terminals of the input plug-in through the interface on the motherboard. These two terminals are then connected to the two pins of the PLC control unit 4 via connecting wires. In this way, the two ends of the anti-dry-burning sensor are connected to the two pins of the PLC control unit 4; simultaneously, the two ends of the analog potentiometer 3 are connected to the same two pins of the PLC control unit 4. This allows the two to be connected in parallel.

[0073] For example, when the communication interface 1 is connected to the motherboard interface, the two ends of the anti-dry-burning sensor can be connected to the two terminals of the input plug-in through the interface on the motherboard, and the two ends of the analog potentiometer 3 can also be connected to the two terminals of the input plug-in, so that the two can be connected in parallel.

[0074] Alternatively, the two terminals can be connected to two pins of other devices via connecting wires, and the two ends of analog potentiometer 3 can be connected to two pins of the other device respectively. This also achieves parallel connection between the two.

[0075] Please see Figure 1 and Figure 3The PLC control unit 4 is connected to the conversion module 2, the analog potentiometer 3, and the communication interface 1, respectively. The PLC control unit 4 is used for:

[0076] 1) Control the analog potentiometer 3 to provide different resistance values; Of course, in other embodiments of the present invention, a traditional mechanical potentiometer can also be used to replace the analog potentiometer 3. The mechanical potentiometer is an adjustable potentiometer with a resistance value of 0-5K. Adjusting the knob of the mechanical potentiometer can change the resistance value. In this case, the PLC control unit 4 may not be used to control the potentiometer to provide resistance values.

[0077] 2) The voltage signal obtained from conversion module 2 is converted into a digital temperature signal. The digital temperature signal is used to display the temperature value on screen 5;

[0078] The voltage signal mentioned above can be a linear voltage value. Digital signals based on linear voltage values ​​are more accurate and intuitive, while traditional detectors cannot convert temperature signals into voltage signals.

[0079] As mentioned earlier, the voltage signal is obtained by conversion module 2 converting the sensing signal from the NTC sensor. However, the resistance of the NTC sensor does not have a linear relationship with temperature.

[0080] In one example, the sensing signal can be used to characterize the resistance value, and a linear relationship between the resistance value and the linear voltage value can be designed. Specifically, the resistance value r corresponds to the voltage value a, and the resistance value 2r corresponds to the voltage value 2a. Furthermore, the PLC control unit 4 presets the correspondence between the voltage value and the temperature. Taking an NTC model (R25 = 100K, B25 / 50 = 3950K) as an example, the above correspondence can be determined based on the parameter relationship between the resistance value and the temperature involved in this model. According to the preset correspondence, the PLC control unit 4 can convert the linear voltage value into the corresponding temperature value.

[0081] In another example, the linear voltage value and temperature value have a linear relationship. Specifically, temperature t corresponds to voltage value a, and temperature 2t corresponds to voltage value 2a. Taking the sensor signal specifically representing resistance as an example, for an NTC model with R25 = 100K and B25 / 50 = 3950K, the correspondence between the sensor signal and the linear voltage value can be determined based on the resistance-temperature parameter relationship for that model. The conversion module can then convert the sensor signal into the corresponding linear voltage value according to the preset correspondence. In the PLC control unit 4, the linear correspondence between the linear voltage value and temperature can be preset, and the PLC control unit 4 can convert the linear voltage value into the corresponding temperature value according to the preset linear correspondence.

[0082] 3) Send sensor signals to the motherboard to simulate the anti-dry-burning sensor sending sensor signals to the motherboard.

[0083] In one example, the PLC control unit 4 can send sensing signals to the main board through the conversion module 2, the analog potentiometer 3, and the communication interface 1.

[0084] Specifically, the signals sent by the PLC control unit 4 can be: sensor signals directly recognized by the electric tea stove mainboard, in which case the conversion module 2, analog potentiometer 3, and communication interface 1 play a transparent transmission role.

[0085] Alternatively, if the signal sent by the PLC control unit 4 cannot be directly recognized by the mainboard of the electric tea stove, the conversion module 2 can convert the signal sent by the PLC control unit 4 into a sensing signal. For example, assuming the sensing signal is a voltage signal of 0 to aV, and the signal sent by the PLC control unit 4 is a voltage signal of 0 to CV, where C is not equal to a, then the conversion module 2 can convert the voltage signal of 0 to CV into a voltage signal of 0 to aV.

[0086] For example, assuming the sensing signal is a voltage signal of 0 to aV, and the signal sent by the PLC control unit 4 is a current signal of 0 to bA, the conversion module 2 can convert the current signal of 0 to bA into a voltage signal of 0 to aV.

[0087] In another example, the PLC control unit 4 can directly send sensor signals to the motherboard via communication interface 1.

[0088] Accordingly, the aforementioned output signals include at least the sensing signals sent by the analog anti-dry-burning sensor to the motherboard.

[0089] For details, please see Figure 4 The PLC control unit 4 can simulate the sensing signal of the anti-dry-burning temperature sensor of the electric tea stove within the range of 0℃-200℃, and the specific temperature value is displayed in the D13 display box. Of course, before use, the communication interface 1 of the multi-functional tester needs to be connected to the interface of the electric tea stove's main board. Then, the PLC control unit 4 can be used to perform temperature rise tests on the anti-dry-burning temperature sensor and test the anti-dry-burning function of the electric tea stove's main board.

[0090] When testing the anti-dry-burning function of the mainboard, the PLC control unit 4 can simulate outputting a sensor signal corresponding to 105℃-200℃ to the electric tea stove mainboard (because water boils at 100℃, while boiling water, without water, can reach temperatures above 100℃; to test the anti-dry-burning function, the output is selected to be 105℃-200℃). The specific expected temperature value is displayed in the D130 display box. D13 and D130 are codes.

[0091] In summary, communication interface 1 is compatible with the motherboard interface. Communication interface 1 integrates multiple connecting cables, capable of receiving input signals from the electric kettle and transmitting output signals to the motherboard. The aforementioned analog potentiometer 3 functions similarly to a fixed resistor in existing technology. During simulation testing, communication interface 1 can be connected to the electric kettle motherboard interface, allowing the analog potentiometer 3 to be connected in parallel with the anti-dry-burning sensor via the connecting cables in the communication interface. Since parallel connection can be achieved simply by connecting communication interface 1 directly to the electric kettle motherboard interface, the insulation layer of the signal cable can be avoided, improving the safety of maintenance work. Furthermore, because the aforementioned analog potentiometer 3 can provide different resistance values, compared to using only a fixed 3.9KΩ±10% resistor in parallel testing, it supports the use of different resistance values ​​for simulation testing, improving the accuracy of the test results.

[0092] Specifically, when using the aforementioned tester to simulate and test the anti-dry-burning sensor function, the communication interface can be connected to the interface of the electric tea stove's main board. Water can then be added to the electric tea stove and heated. The various components of the tester work together as follows: the conversion module converts the sensing signal from the anti-dry-burning sensor into a voltage signal, and the PLC control unit 4 converts the voltage signal into a digital temperature signal that can be displayed on the screen. If there is no digital temperature signal, it proves that the anti-dry-burning sensor is damaged; if there is a digital temperature signal, it proves that the anti-dry-burning sensor is not damaged.

[0093] Alternatively, the resistance value provided by the analog potentiometer can be adjusted. After obtaining the parallel resistance value of the analog potentiometer and the NTC in the anti-dry-burning sensor, the real-time resistance value of the NTC can be calculated backwards using the parallel resistance formula. Then, the real-time temperature of the NTC can be calculated based on the real-time resistance value. The calculated real-time temperature is then compared with the temperature represented by the digital temperature signal. If the temperature difference is within an acceptable range, it indicates that the anti-dry-burning sensor is working properly and detecting the temperature accurately; otherwise, it indicates that the anti-dry-burning sensor is not detecting the temperature accurately.

[0094] When using the above-mentioned testing instrument to simulate the anti-dry-burning function of the electric tea stove, the electric tea stove can be emptied and heated. The various components of the testing instrument work together as follows: the PLC control unit sends a sensing signal to the main board through the communication interface to simulate the anti-dry-burning sensor sending a sensing signal to the main board. If the electric tea stove automatically cuts off the power and stops heating, it proves that the anti-dry-burning function of the electric tea stove is normal; otherwise, it proves that the anti-dry-burning function of the electric tea stove is not normal.

[0095] In addition to the anti-dry-burning sensor, the electric tea stove is also equipped with a water level sensor. A multi-functional detector can then be used to simulate the water level sensor readings.

[0096] In this embodiment, the output signal further includes a water level sensing signal sent by an analog water level sensor.

[0097] In one example, PLC control unit 4 can directly send water level sensing signals to the main board via communication interface 1. In another example, PLC control unit 4 can also send water level sensing signals to the main board via conversion module 2, analog potentiometer 3, and communication interface 1. The signal sent by PLC control unit 4 can be a water level sensing signal directly recognized by the electric kettle main board, in which case conversion module 2, analog potentiometer 3, and communication interface 1 serve as transparent transmission.

[0098] Alternatively, if the signal sent by the PLC control unit 4 cannot be directly recognized by the electric tea stove's mainboard, the conversion module 2 can convert the signal sent by the PLC control unit 4 into a water level sensing signal. The specific implementation method is similar to that described above and will not be repeated here.

[0099] In another example, PLC control unit 4 can also send water level sensing signals to the main board via voltage detection relay 6 and communication interface 1. This will be discussed in detail later in the section on voltage detection relay 6.

[0100] The electric kettle includes a water boiling tank and a water storage tank, both of which are equipped with water level sensors to monitor the water level.

[0101] Please see Figure 10 The PLC control unit 4 can simulate the water level extremes of the electric kettle's water tank and storage tank by simulating water level sensor signals, i.e., the water level extreme point access mode setting displayed on screen 5. The water level extremes include the highest water level and the lowest water level.

[0102] In other words, the water level sensing signal sent by the multi-functional detector can be used to characterize one or more of the following: the water level in the boiler tank is at the highest level, the water level in the boiler tank is at the lowest level, the water level in the storage tank is at the highest level, and the water level in the storage tank is at the lowest level.

[0103] When the water level reaches an extreme point, the mainboard of the electric tea stove will take corresponding actions. By observing whether the mainboard of the electric tea stove performs the expected actions, it can be determined whether the mainboard is functioning normally.

[0104] In other embodiments of the present invention, the motherboard's action signal (e.g., the anti-dry-burning protection action signal) can be transmitted through the communication interface 1, processed by the PLC control unit 4 into a signal suitable for screen display, and displayed on the screen.

[0105] The aforementioned input signals may also include: motherboard action signals.

[0106] In one example, please see still Figure 3 The PLC control unit 4 has a signal interface. The signal interface is used to receive at least the switching signals converted by the voltage detection relay 6 and the sensing signals emitted by the anti-dry-burning sensor.

[0107] Please see Figure 5 The PLC control unit 4 has expansion capabilities. Based on the existing hardware of the multi-functional tester, the PLC control unit 4 was designed through secondary programming to perform testing on the main function of the railway passenger car brake monitoring host. Further upgrade space is reserved for future development, aiming to enable one multi-functional tester to test multiple railway passenger car electrical devices.

[0108] The following describes screen 5.

[0109] Please see again Figure 1 Screen 5 is connected to PLC control unit 4 and is used to display digital temperature signals.

[0110] In one example, screen 5 could be a touchscreen or another type of display. Screen 5 can display different content to facilitate human-computer interaction.

[0111] For example, see Figure 6 The "Anti-dry-burning access mode" function on screen 5 includes three detection modes: "actual anti-dry-burning access output of the electric tea stove," "simulated anti-dry-burning output of the detector," and "parallel anti-dry-burning access output." Users can switch between these modes according to their actual needs, providing a good human-machine interface experience. These three detection modes correspond to three control programs in the PLC control unit 4.

[0112] The voltage detection relay 6 is described below.

[0113] Please see again Figure 1 The voltage detection relay 6 is connected to the communication interface 1. The voltage detection relay 6 is used to convert the analog voltage signals of each indicator light of the electric tea stove into switching signals; the input signals mentioned above may include the analog voltage signals of each indicator light.

[0114] The voltage detection relay 6 is connected to the PLC control unit 4, which converts the switch input into status information for each indicator light; the status information is then displayed on the screen 5.

[0115] In one example, the indicator lights include three indicators: power, heating, and water shortage. Please refer to the relevant documentation for details. Figure 7 The screen displays three indicator icons: "Power, Heating, and Water Shortage," represented by X0, M0, and X1, respectively.

[0116] If none of the three indicator lights are lit, it means that the voltage detection relay 6 has not converted the analog voltage signals of each indicator light of the electric tea stove into switch signals or that the communication interface 1 has not yet been connected to the motherboard interface.

[0117] After communication interface 1 is connected to the motherboard interface, voltage detection relay 6 converts the analog voltage signals of each indicator light on the electric tea stove into switching signals. PLC control unit 4 then converts these switching signals into status information for each indicator light, which is displayed on screen 5. If there is status information, the corresponding indicator light icon on screen 5 illuminates; if an indicator light lacks corresponding status information, its icon remains off. This provides operators with a basis for quickly determining whether components such as solenoid valves and heating elements in the electric tea stove are malfunctioning, and offers a means of detection.

[0118] In addition, as mentioned earlier when describing the use of a testing instrument to simulate the test of the electric tea stove's anti-dry-burning function, if the electric tea stove automatically shuts off and stops heating, it proves that the anti-dry-burning function of the electric tea stove is normal; otherwise, it proves that the anti-dry-burning function of the electric tea stove is not normal.

[0119] In this embodiment, the presence or absence of the "water shortage" indicator light on the screen can be used to determine whether the electric tea stove has automatically shut off and stopped heating. If it is lit, it indicates that the electric tea stove has automatically shut off and stopped heating, and its anti-dry-burning function is normal. Otherwise, it indicates that the electric tea stove has not automatically shut off and stopped heating.

[0120] As mentioned above, the PLC control unit 4 can also send water level sensing signals to the main board via the voltage detection relay 6 and the communication interface 1. Specifically, the PLC control unit 4 can preset the relationship between different water level poles and switching quantities or combinations thereof. Based on the above relationship, it sends the corresponding switching quantity or combination thereof to the voltage detection relay 6. The voltage detection relay 6 can convert the switching quantity or combination thereof into a water level sensing signal that the main board can recognize, and then transmit it to the main board via the communication interface 1.

[0121] The following section describes storage module 7.

[0122] Please see again Figure 1 The storage module 7 is connected to the PLC control unit 4, and the storage module 7 is used to store the temperature value in the digital temperature signal.

[0123] Of course, storage module 7 can also store the date, time, etc., corresponding to the temperature value at the same time.

[0124] In addition, storage module 7 can also be used to store other data, such as alarm information, which will be discussed later in this article. Please see [link to storage module 7]. Figure 8 Screen 5 can be used to display historical data stored in storage module 7. Each piece of historical data may include, for example, the date, time, and real-time temperature for preventing dry burning.

[0125] The following describes alarm module 8.

[0126] Please see again Figure 1 The alarm module 8 is connected to the PLC control unit 4, and the alarm module 8 is used to issue an alarm according to the control signal;

[0127] The PLC control unit 4 issues a control signal when the heating duration of the electric tea stove exceeds the threshold time and / or the temperature exceeds the threshold temperature; the threshold time and threshold temperature can be set by the PLC control unit 4.

[0128] In one example, see Figure 9 The multi-functional detector features an over-temperature alarm function. When the electric tea stove's mainboard receives a signal from the anti-dry-burning sensor or a simulated signal, screen 5 can accurately display the temperature value during the anti-dry-burning action and the duration of the heating state, and trigger an alarm. Specifically, the over-temperature alarm function is activated when the heating duration exceeds a threshold time and / or the temperature exceeds a threshold temperature. Storage module 7 stores the alarm data.

[0129] The aforementioned duration can be determined based on the status information of the indicator light. The status information of the aforementioned "heating" indicator light can be displayed on screen 5, and the start time and duration of heating can be recorded based on this status information. This allows staff to accurately detect the anti-dry-burning action parameters of the electric tea stove and perform fault analysis by reviewing historical data, thereby determining whether the anti-dry-burning function of the electric tea stove is qualified.

[0130] Please see Figure 9 The alarm information displayed on screen 5 may include, for example, time, date and message, wherein the D13 display box is used to display temperature value, and the lower right corner of screen 5 displays the current time.

[0131] The following section introduces power module 9.

[0132] Please see again Figure 1 The power supply module 9 is connected to other components in the multi-functional detector to supply power to them; the other components include at least: PLC control unit 4, conversion module 2, screen 5 and voltage detection relay 6.

[0133] In one example, please see still Figure 3 The power module 9 specifically includes a 24V lithium battery, a charging and discharging circuit, and a charging interface. The following describes how the portable multi-functional tester for electric tea stoves in railway passenger cars operates.

[0134] Please see Figure 2 The exemplary operating steps of the multi-functional detector include:

[0135] Step 1: Press the power button to power on the multi-functional detector. The detector will power on and initialize, displaying the initialization interface.

[0136] Step 2: Enter the electric tea stove water level extreme point setting interface, where you can choose to connect the actual water level sensor of the electric tea stove or the detector to simulate the water level sensor.

[0137] If the detector is selected to simulate the water level extreme point connection, the water level sensing signal can be transmitted to the main board of the electric tea stove in real time through the PLC control unit 4 to change the water level extreme point state of the electric tea stove's boiling water tank and / or storage tank, thereby simulating different working conditions of the electric tea stove.

[0138] In one example, the sensor signals currently being received by the motherboard can be displayed on the screen. See also Figure 11 Screen 5 displays the simulated pole connections of the detector. A long pole connection to the water tank indicates that the highest water level information of the water tank is input into the multi-function detector; if the "M102 Disconnect Indicator" is lit, it means that no highest water level information has been input. A pole connection to the water tank indicates that the lowest water level information of the water tank is input into the multi-function detector; if the "M113 Disconnect Indicator" is lit, it means that no lowest water level information has been input. A long pole connection to the storage tank indicates that the highest water level information of the storage tank is input into the multi-function detector; if the "M114 Disconnect Indicator" is lit, it means that no highest water level information has been input. A common pole connection indicates that the same water level information of both the water tank and the storage tank is input into the multi-function detector; if the "M104 Disconnect Indicator" is lit, it means that no same water level information has been input. "M102, M113, M114, and M104" are codes.

[0139] Step 3: Enter the electric tea stove anti-dry burning connection mode setting interface, where you can select the actual anti-dry burning connection of the electric tea stove or the simulated anti-dry burning connection of the detector;

[0140] If the detector is selected to simulate the anti-dry-burning access mode, the PLC control unit 4 can simulate a temperature sensing signal and transmit it to the NTC detection conversion board (conversion module 2) in real time. Adjusting the potentiometer resistance (simulated potentiometer 3) can provide different resistance values. For a detailed description, please refer to the foregoing.

[0141] If the electric tea stove's actual anti-dry-burn mode is selected, the sensing signal (i.e., the actual sensing signal) of the anti-dry-burn probe (anti-dry-burn sensor) is transmitted to the NTC detection conversion board (conversion module 2) via the main board. After a series of processing steps, the temperature value is finally displayed on the screen (see the aforementioned description). The real-time temperature change of the anti-dry-burn sensor is detected by a multi-functional detector to determine the performance of the anti-dry-burn sensor. Detailed descriptions are available in the aforementioned description.

[0142] Step 4: Enter the real-time temperature display interface for the electric tea stove's anti-dry-burning feature. This interface displays the real-time temperature rise status of the anti-dry-burning probe (anti-dry-burning sensor) and the anti-dry-burning protection activation time. The temperature rise status refers to the state of the anti-dry-burning probe as its temperature continues to rise (specifically, this may include: duration, the temperature rise from the start of the temperature rise to the current moment, etc.). The anti-dry-burning protection activation time refers to the moment when the main board sends out an anti-dry-burning protection activation signal.

[0143] Step 5: Enter the electric tea stove indicator light status display interface. The voltage detection relay 6 is powered on and works, displaying the status of the electric tea stove's "Power", "Heating", and "Water Shortage" indicator lights in real time, so that maintenance and testing personnel can keep track of the electric tea stove's current operating status.

[0144] Step 6: Enter the alarm and recording interface to view the temperature and working time when the electric tea stove's anti-dry burning action is activated, and the temperature value corresponding to the temperature sensing signal simulated by the analog potentiometer 3.

[0145] When the multi-functional detector detects a temperature sensor signal exceeding the threshold temperature (120℃), alarm module 8 is triggered to sound an alarm. If the electric tea stove is in a dry-burning state and the temperature does not reach 120℃ within 30 seconds of exceeding the threshold temperature, alarm module 8 will also sound an alarm.

[0146] Of course, the order of steps 2-6 can be interchanged.

[0147] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0148] This document uses specific examples to illustrate the principles and implementation methods of the embodiments of the present invention. The descriptions of the embodiments above are only for the purpose of helping to understand the methods and core ideas of the embodiments of the present invention. At the same time, for those skilled in the art, there will be changes in specific implementation methods and application scope based on the ideas of the embodiments of the present invention. In summary, the content of this specification should not be construed as a limitation on the embodiments of the present invention.

Claims

1. A portable multifunctional detector for electric tea stove of railway passenger car, wherein, The electric tea stove comprises an anti-dry-burning sensor and a main board, the anti-dry-burning sensor is connected with the interface of the main board through a connecting line, and characterized in that it comprises: a communication interface matched with the interface of the main board, the communication interface integrates a plurality of connecting lines, is used for receiving an input signal from the electric tea stove, and transmitting an output signal to the main board; a conversion module connected with the communication interface through a connecting line, used for converting a sensing signal of the anti-dry-burning sensor into a voltage signal; the input signal at least comprises the sensing signal of the anti-dry-burning sensor; an analog potentiometer connected with the conversion module, when the communication interface is connected with the interface of the main board, the analog potentiometer is connected in parallel with the anti-dry-burning sensor; a PLC control unit connected with the conversion module, the analog potentiometer and the communication interface respectively, used for: converting the voltage signal into a digital temperature signal; controlling the analog potentiometer to provide different resistances; sending the sensing signal to the main board at least through the communication interface, to simulate the anti-dry-burning sensor sending the sensing signal to the main board; a screen connected with the PLC control unit, wherein the digital temperature signal is used for displaying a temperature value on the screen; the output signal at least comprises the sensing signal sent by the PLC control unit simulating the anti-dry-burning sensor to the main board; the PLC control unit sends the sensing signal to the main board through the conversion module, the analog potentiometer and the communication interface; the conversion module converts the sensing signal into a corresponding linear voltage value according to a preset corresponding relationship between the sensing signal and the linear voltage value, and the PLC control unit converts the linear voltage value into a corresponding temperature value according to a linear corresponding relationship between the preset linear voltage value and the temperature.

2. The portable electric tea stove multifunctional detector according to claim 1, characterized in that: it further comprises a voltage detection relay; the voltage detection relay is connected with the communication interface, and the voltage detection relay is used for converting analog voltage signals of each indicator light of the electric tea stove into switching values; the input signal comprises the analog voltage signals of each indicator light.

3. The portable railway passenger car electric tea stove multifunctional detector according to claim 2, characterized in that, the voltage detection relay is connected with the PLC control unit, and the PLC control unit converts the switching values into state information of each indicator light; the state information is used for displaying on the screen.

4. The portable detector for electric tea boiler of railway passenger car according to claim 1, characterized in that, it further comprises: a storage module connected with the PLC control unit, used at least for storing the digital temperature signal.

5. The portable detector for electric tea boiler of railway passenger car according to claim 1, characterized in that, it further comprises: an alarm module connected with the PLC control unit, used for issuing an alarm according to a control signal; the PLC control unit is further used for: issuing the control signal when a heating state duration of the electric tea stove exceeds a threshold time and / or the temperature value exceeds a threshold temperature.

6. The portable railway passenger car electric tea stove multifunctional detector according to claim 3, characterized in that, the PLC control unit has a signal interface; the signal interface is used at least for receiving the switching values issued by the voltage detection relay and the sensing signal issued by the anti-dry-burning sensor.

7. The portable detector for electric tea boiler of railway passenger car according to claim 1, characterized in that, The PLC control unit is further configured to send a water level sensing signal to the mainboard through the communication interface to simulate a water level sensing signal sent by a water level sensor at different water level extreme points; the water level sensor belongs to the electric tea urn; the output signal further includes a water level sensing signal sent by the water level sensor.

8. The portable detector for electric tea boiler of railway passenger car according to claim 3, characterized in that, Comprise: A power module connected with other devices in the detector respectively to supply power for the other devices; The other devices at least include the PLC control unit, the conversion module, the screen and the voltage detection relay.

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