A multi-channel online temperature detection device

Abstract

This invention relates to a multi-channel online temperature detection device, belonging to the field of temperature measurement technology. It solves the problems of fixed sensor selection in existing detection devices, the inability to automatically identify sensor types, and poor flexibility and adaptability. The device includes a microcontroller and at least one temperature acquisition channel connected to the microcontroller. Each temperature acquisition channel includes a data acquisition module, a temperature sensor identification circuit, and a temperature sensor module. The temperature sensor identification circuit acquires identification data to identify the temperature sensor type of the temperature sensor module in the temperature acquisition channel and transmits the identification data to the microcontroller. The microcontroller determines the temperature sensor type of the corresponding temperature acquisition channel's temperature sensor module based on the identification data and outputs a data acquisition command to the corresponding temperature acquisition channel's data acquisition module based on the temperature sensor type. It also obtains the temperature of the temperature acquisition channel based on the temperature data acquired by the data acquisition module.

Description

Technical Field

[0001] This invention relates to the field of temperature detection technology, and in particular to a multi-channel online temperature detection device. Background Technology

[0002] In industrial production and testing, temperature is a crucial indicator reflecting the technical performance of the tested object and its relationship to safe production and process quality. Temperatures exceeding set thresholds can not only damage product quality but also potentially cause serious accidents such as fires and explosions, endangering life and property. Online temperature monitoring devices collect temperature signals from key measuring points in real time using temperature sensors, test specified technical performance indicators of the tested object, provide on-site alarms for over-temperature conditions, and feed back to the platform system. Realizing online monitoring is of significant importance for the timely detection and response to safety hazards, ensuring the safety and quality of production and testing.

[0003] Traditional online temperature monitoring devices often use fixed-type sensors as sensing devices, which lacks flexibility, cannot automatically identify sensor types, and has poor adaptability. They also mostly use a single communication method, which has low reliability and is prone to disconnection, leading to interruptions in the measurement process. At the same time, traditional online temperature monitoring devices have a limited number of channels, and the temperature limits of each channel cannot be set independently. When dealing with multiple key measuring points, each with customized temperature limit requirements, multiple sets of temperature monitoring equipment need to be deployed separately, which consumes too much equipment and communication resources and increases the difficulty of on-site deployment. Summary of the Invention

[0004] Based on the above analysis, the present invention aims to provide a multi-channel online temperature detection device to solve the problems of fixed sensor selection, inability to automatically identify sensor types, and poor flexibility and adaptability of existing detection devices.

[0005] This invention provides a multi-channel online temperature detection device, including a microcontroller and at least one temperature acquisition channel connected to the microcontroller. The temperature acquisition channel includes a data acquisition module, a temperature sensor identification circuit, and a temperature sensor module.

[0006] The temperature sensor identification circuit is used to collect identification data that identifies the temperature sensor type of the temperature sensor module of the temperature acquisition channel, and transmit the identification data to the microcontroller.

[0007] The microcontroller is used to determine the temperature sensor type of the temperature sensor module of the corresponding temperature acquisition channel based on the identification data, and output a data acquisition instruction to the data acquisition module of the corresponding temperature acquisition channel based on the type of the temperature sensor.

[0008] The data acquisition module is used to acquire the temperature data of the temperature sensor module according to the data acquisition instruction, and transmit the temperature data to the microcontroller.

[0009] The microcontroller is also used to obtain the temperature of the temperature acquisition channel based on the received temperature data.

[0010] Furthermore, the temperature sensor module includes a six-pin aviation connector and a temperature sensor fixed to the male end of the six-pin aviation connector; wherein the temperature sensor is a PT100 temperature sensor, a T-type thermocouple sensor, or a K-type thermocouple sensor.

[0011] Furthermore, if the temperature sensor in the temperature sensor module is a PT100 temperature sensor, then pins 1, 2, and 3 of the six-pin aviation connector male are fixedly connected to pins A, B, and B' of the PT100 temperature sensor, respectively.

[0012] If the temperature sensor in the temperature sensor module is a T-type thermocouple, then pins 4 and 5 of the six-pin aviation connector male are fixedly connected to the positive and negative pins of the T-type thermocouple sensor, respectively, and pins 1 and 2 of the six-pin aviation connector are shorted.

[0013] If the temperature sensor in the temperature sensor module is a type K thermocouple sensor, then pins 4 and 5 of the six-pin aviation connector male are fixedly connected to the positive and negative pins of the type K thermocouple temperature sensor, respectively.

[0014] Furthermore, the temperature sensor identification circuit includes a first resistor and a second resistor;

[0015] The temperature sensor has six input terminals that correspond one-to-one with the pins of the six-pin aviation connector for connecting to the temperature sensor module; it also includes an output terminal for outputting an identification voltage and transmitting it as identification data to the microcontroller.

[0016] The first input terminal is connected to one end of the second resistor; the third input terminal is connected to one end of the first resistor; the other end of the first resistor is connected to the other end of the second resistor, and the second input terminal is connected to the common terminal B of the first and second resistors;

[0017] One end of the second resistor connected to the first input terminal is grounded; the end A of the first resistor connected to the third input terminal is connected to the supply voltage VCC, and this end, together with the common terminal B of the first and second resistors, forms the output terminal, outputting the identification voltage V. AB .

[0018] Furthermore, the microcontroller determines the temperature sensor type of the temperature sensor module in the corresponding temperature acquisition channel using the following method:

[0019] If V AB If the value is 0, then the temperature sensor type is determined to be a PT100 temperature sensor.

[0020] like Then the temperature sensor type is determined to be a type K thermocouple sensor;

[0021] If V AB If the value is VCC, then the temperature sensor type is determined to be a type T thermocouple sensor.

[0022] Where R1 represents the first resistance value and R2 represents the second resistance value.

[0023] Furthermore, the data acquisition module is equipped with multiple data acquisition circuits; the data acquisition module selects the corresponding data acquisition circuit according to the temperature sensor type in the data acquisition instruction to acquire the real-time resistance value or millivolt value of the temperature sensor and uses the data as temperature data;

[0024] The microcontroller also stores a temperature lookup table of temperature values ​​corresponding to different resistance values ​​or millivolt values ​​of each temperature acquisition channel. When temperature data is received, the corresponding temperature value is determined based on the correspondence between the resistance value or millivolt value in the temperature data and the temperature of the corresponding temperature acquisition channel, and this value is used as the temperature of that temperature acquisition channel.

[0025] Furthermore, the temperature lookup table for each temperature acquisition channel sequentially stores the temperature values ​​corresponding to n discrete resistance values ​​or millivolt values.

[0026] When the microprocessor receives temperature data, it determines the resistance value or millivolt value Y in the temperature data. x The corresponding resistance or millivolt range in the corresponding temperature reference [Y] i Y i+1 ], and the corresponding temperature range [T i T i+1 The temperature T of the temperature acquisition channel is obtained using the following formula. x :

[0027]

[0028] Furthermore, the microcontroller performs temperature calibration and correction of the temperature lookup table before the detection device starts detection, including:

[0029] The temperature sensor modules of each temperature acquisition channel are sequentially placed into standard temperature sources at different temperature points. The microcontroller continuously acquires the temperature of each temperature point and averages it. When the average temperature value stabilizes, the resistance value or millivolt value corresponding to each temperature point is calibrated and stored in the corresponding temperature lookup table.

[0030] Furthermore, the detection device also includes a touch screen display module, a storage module, and a communication module connected to the microcontroller;

[0031] The touch screen display module is used to display the temperature of each temperature acquisition channel and the corresponding sensor type obtained by the microcontroller in real time;

[0032] The storage module is used to store the temperatures of each temperature acquisition channel obtained by the microcontroller in real time.

[0033] The communication module is used to connect the microcontroller to the network via WIFI or 4G for remote communication.

[0034] Furthermore, the detection device also sets the detection frequency for temperature acquisition and independently sets the upper and lower limits of temperature for each temperature acquisition channel. The microcontroller acquires the temperature of each temperature acquisition channel according to the set detection frequency and provides an early warning by comparing the temperature acquired by each temperature acquisition channel with the set upper and lower limits.

[0035] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0036] This invention provides a multi-channel online temperature detection device.

[0037] 1. By setting up multiple temperature acquisition channels, each channel can be independently configured and connected to different types of sensors. The designed temperature sensor identification circuit automatically identifies the sensor type of each channel, and the microcontroller obtains the temperature data of the corresponding channel according to the temperature sensor type, thereby obtaining the corresponding temperature. This makes it more flexible and adaptable.

[0038] 2. Real-time display of temperature and corresponding sensor type for each temperature acquisition channel via touchscreen display module; real-time storage of temperature from each temperature acquisition channel via storage module; making it more intelligent and convenient;

[0039] 3. The communication module enables both WIFI and 4G network connectivity, providing excellent field applicability and reliability.

[0040] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the description or be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained from what is particularly pointed out in the description and drawings. Attached Figure Description

[0041] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0042] Figure 1 This is a structural connection diagram of the multi-channel online temperature detection device provided in Embodiment 1 of the present invention;

[0043] Figure 2 This is a pin connection diagram of the temperature sensor module provided in Embodiment 1 of the present invention;

[0044] Figure 3 This is a connection diagram of the temperature sensor identification circuit provided in Embodiment 1 of the present invention;

[0045] Figure 4 A connection diagram of the first data acquisition circuit provided in Embodiment 1 of the present invention.

[0046] Figure 5 This is a connection diagram of the second data acquisition circuit provided in Embodiment 1 of the present invention.

[0047] Figure 6 This is a perspective view of the multi-channel online temperature detection device provided in Embodiment 2 of the present invention;

[0048] Figure 7 This is a schematic diagram of the back of the multi-channel online temperature detection device provided in Embodiment 2 of the present invention. Detailed Implementation

[0049] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0050] Example 1

[0051] A specific embodiment of the present invention discloses a multi-channel online temperature detection device, such as... Figure 1 As shown, it includes a microcontroller and at least one temperature acquisition channel connected to the microcontroller. The temperature acquisition channel includes a data acquisition module, a temperature sensor identification circuit, and a temperature sensor module.

[0052] The temperature sensor identification circuit is used to collect identification data that identifies the temperature sensor type of the temperature sensor module of the temperature acquisition channel, and transmit the identification data to the microcontroller.

[0053] The microcontroller is used to determine the temperature sensor type of the temperature sensor module of the corresponding temperature acquisition channel based on the identification data, and output a data acquisition instruction to the data acquisition module of the corresponding temperature acquisition channel based on the type of the temperature sensor.

[0054] The data acquisition module is used to acquire the temperature data of the temperature sensor module according to the data acquisition instruction, and transmit the temperature data to the microcontroller.

[0055] The microcontroller is also used to obtain the temperature of the temperature acquisition channel based on the received temperature data.

[0056] Compared with the prior art, this embodiment provides a multi-channel online temperature detection device. By setting multiple temperature acquisition channels, each channel can be independently set and connected to different types of sensors. The device automatically identifies the sensor type of each channel according to the designed temperature sensor identification circuit. Then, the microcontroller obtains the temperature data of the corresponding channel according to the temperature sensor type, and thus obtains the corresponding temperature. This device is more flexible and adaptable.

[0057] In implementation, the temperature sensor module includes a six-pin aviation connector and a temperature sensor fixed to the male connector of the six-pin aviation connector; wherein the temperature sensor is a PT100 temperature sensor, a T-type thermocouple sensor, or a K-type thermocouple sensor. It should be noted that the six-pin aviation connector includes a male and a female connector. The temperature sensor is fixed to the male connector, and different types of temperature sensors can be switched by changing the male connector. The female connector is used to connect to the temperature sensor identification circuit and the data acquisition circuit.

[0058] Specifically, within the temperature measurement range of -80℃ to 300℃, a T-type thermocouple or a PT100 temperature sensor can be selected; between 300℃ and 1300℃, a K-type thermocouple sensor can be used.

[0059] In specific implementation, such as Figure 2 As shown, if the temperature sensor in the temperature sensor module is a PT100 temperature sensor, then pins 1, 2, and 3 of the six-pin aviation connector male are fixedly connected to pins A, B, and B' of the PT100 temperature sensor, respectively; if the temperature sensor in the temperature sensor module is a T-type thermocouple, then pins 4 and 5 of the six-pin aviation connector male are fixedly connected to the positive and negative pins of the T-type thermocouple sensor, and pins 1 and 2 of the six-pin aviation connector male are shorted; if the temperature sensor in the temperature sensor module is a K-type thermocouple sensor, then pins 4 and 5 of the six-pin aviation connector male are fixedly connected to the positive and negative pins of the K-type thermocouple temperature sensor, respectively; the other pins of the six-pin aviation connector male are not processed.

[0060] When implementing, such as Figure 3As shown, the temperature sensor identification circuit includes a first resistor and a second resistor; the temperature sensor is provided with six input terminals that correspond one-to-one with the pins of the six-pin aviation connector for connection to the temperature sensor module; it also includes an output terminal for outputting an identification voltage and transmitting it as identification data to the microcontroller;

[0061] The first input terminal is connected to one end of the second resistor; the third input terminal is connected to one end of the first resistor; the other end of the first resistor is connected to the other end of the second resistor, and the second input terminal is connected to the common terminal B of the first and second resistors;

[0062] One end of the second resistor connected to the first input terminal is grounded; the end A of the first resistor connected to the third input terminal is connected to the supply voltage VCC, and this end, together with the common terminal B of the first and second resistors, forms the output terminal, outputting the identification voltage V. AB .

[0063] In other words, the common terminal of the first resistor and the second resistor is used as the detection terminal A, and the end of the first resistor connected to the third input terminal is used as the detection terminal B. The voltage V between points A and B is output. AB The identification voltage is output as the output terminal.

[0064] In implementation, the microcontroller determines the temperature sensor type of the temperature sensor module in the corresponding temperature acquisition channel using the following method:

[0065] If V AB If the value is 0, then the temperature sensor type is determined to be a PT100 temperature sensor.

[0066] like Then the temperature sensor type is determined to be a type K thermocouple sensor;

[0067] If V AB If the value is VCC, then the temperature sensor type is determined to be a type T thermocouple sensor.

[0068] Where R1 represents the first resistance value and R2 represents the second resistance value.

[0069] Understandably, different types of temperature sensors can be selected for each temperature acquisition channel, which offers greater flexibility. Furthermore, the temperature sensor identification circuit collects and identifies the data, automatically recognizing the type of temperature sensor for each temperature acquisition channel, thus improving adaptability and convenience.

[0070] In implementation, the data acquisition module is equipped with multiple data acquisition circuits. The data acquisition module selects the appropriate data acquisition circuit based on the temperature sensor type in the data acquisition instruction to acquire the real-time resistance value or millivolt value of the temperature sensor, and uses this data as temperature data. The microcontroller also stores a temperature lookup table corresponding to different resistance values ​​or millivolt values ​​for each temperature acquisition channel. When temperature data is received, the corresponding temperature value is determined based on the correspondence between the resistance value or millivolt value in the temperature data and the temperature of the corresponding temperature acquisition channel, and this value is used as the temperature of that temperature acquisition channel.

[0071] In specific implementation, the data acquisition module is equipped with a first data acquisition circuit for acquiring the millivolt values ​​of K-type thermocouple sensors and T-type thermocouple sensors, and a second data acquisition circuit for acquiring the resistance value of PT100 temperature sensors; the data acquisition module selects the appropriate data acquisition circuit according to the type of temperature sensor to acquire the real-time resistance value or millivolt value of the temperature sensor.

[0072] Specifically, the first data acquisition circuit, such as Figure 4 As shown, it includes resistors R3 to R10, capacitors C1 to C8, and an analog-to-digital converter chip ADS1118;

[0073] The analog input terminal AIN0 of the ADS1118 analog-to-digital converter chip is grounded through capacitor C1, then connected to power supply VDD through resistor R5 and then through resistor R3, and then connected to one end of the temperature sensor module through resistor R5; the analog input terminal AIN1 is grounded through capacitor C3, then connected to ground through resistor R6 and then through resistor R4, and then connected to the other end of the temperature sensor module through resistor R6; the analog input terminal AIN0 is connected to the analog input terminal AIN1 through capacitor C2.

[0074] The analog input terminal AIN2 of the ADS1118 analog-to-digital converter chip is grounded through capacitor C4, then connected to power supply VDD through resistor R9 and then through resistor R7, and then connected to one end of the temperature sensor module through resistor R9; the analog input terminal AIN3 is grounded through capacitor C6, then connected to ground through resistor R10 and then through resistor R8, and then connected to the other end of the temperature sensor module through resistor R10; the analog input terminal AIN2 is connected to the analog input terminal AIN3 through capacitor C5.

[0075] The power supply terminal of the analog-to-digital converter chip ADS1118 is connected to the power supply VDD, and is also grounded through capacitor C7 and capacitor C8.

[0076] The digital input terminal of the ADS1118 analog-to-digital converter chip is connected to the microcontroller to receive data acquisition commands, and the output terminal DOUT is connected to the microcontroller to output the millivolt digital signal of the corresponding temperature sensor module to the microcontroller.

[0077] Specifically, the second data acquisition circuit, such as Figure 5 As shown, it includes a digital output converter MAX31865, resistors R11 to R14, and capacitors C9 to C11;

[0078] The positive sensor input terminal RTDIN+ of the MAX31865 digital output converter is connected to one end of the temperature sensor module via resistor R12; the negative sensor input terminal RTDIN- is connected to the other end of the temperature sensor module via resistor R13; the positive sensor input terminal RTDIN+ is connected to the negative sensor input terminal RTDIN- via capacitor C11; and the negative sensor input terminal RTDIN- is connected to the low-side RTD loop terminal FORCE-.

[0079] The high-side RTD driver terminal FORCE+ of the MAX31865 digital output converter is connected to one end of the temperature sensor module via resistor R11, and is also connected to the positive input terminal FORCE2.

[0080] The bias voltage output terminal BIAS of the MAX31865 digital output converter is shorted to the positive terminal REFIN+ of the reference voltage input, and is also connected to the negative terminal REFIN- and the low-side terminal ISENSOR of the reference voltage input via resistor R14; the digital power input terminal DVDD is grounded via capacitor C10 and is also connected to the power supply VDD; the analog power input terminal V... DD The terminal is grounded via capacitor C9 and also connected to the power supply VDD;

[0081] The serial input of the MAX31865 digital output converter is connected to the microcontroller to receive data acquisition commands, and the serial output is also connected to the microcontroller to output the digital signal of the resistance value of the temperature sensor module to the microcontroller.

[0082] In practice, the temperature lookup table for each temperature acquisition channel sequentially stores the temperature values ​​corresponding to n discrete resistance values ​​or millivolt values; where n is set according to actual needs.

[0083] When the microprocessor receives temperature data, it determines the resistance value or millivolt value Y in the temperature data. x The corresponding resistance or millivolt range in the corresponding temperature reference [Y] i Y i+1 ], and the corresponding temperature range [T i T i+1 The temperature T of the temperature acquisition channel is obtained using the following formula. x :

[0084]

[0085] It is understandable that when the temperature sensor type of the temperature acquisition channel is a K-type thermocouple sensor or a T-type thermocouple sensor, the corresponding temperature lookup table stores the millivolt value and the corresponding temperature value; when the temperature sensor type of the temperature acquisition channel is a PT100 temperature sensor, the corresponding temperature lookup table stores the resistance value and the corresponding temperature value.

[0086] Preferably, the microcontroller performs temperature calibration and correction of the temperature lookup table before the detection device starts detection, including:

[0087] The temperature sensor modules of each temperature acquisition channel are sequentially placed into standard temperature sources at different temperature points. The microcontroller continuously acquires the temperature of each temperature point and averages it. When the average temperature value stabilizes, the resistance value or millivolt value corresponding to each temperature point is calibrated and stored in the corresponding temperature lookup table.

[0088] Specifically, each temperature acquisition channel can be calibrated individually or simultaneously. After placing the temperature sensor module into the standard temperature source, select the temperature acquisition channel to be calibrated. At this time, the microcontroller continuously acquires the temperature of each temperature point and averages it. When the average temperature value stabilizes, the resistance value or millivolt value corresponding to each temperature point is calibrated and stored in the corresponding temperature lookup table.

[0089] Preferably, the detection device further includes a touch screen display module, a storage module, and a communication module connected to the microcontroller;

[0090] The touchscreen display module is used to display the temperature and corresponding sensor type of each temperature acquisition channel obtained by the microcontroller in real time; wherein, when displaying the temperature, it can display the process curve of temperature over time in each temperature acquisition channel.

[0091] The storage module is used to store the temperatures of each temperature acquisition channel obtained by the microcontroller in real time.

[0092] The communication module is used to connect the microcontroller to the network via Wi-Fi or 4G for remote communication with the cloud platform. Understandably, when a Wi-Fi hotspot is present, the collected temperature data is uploaded in real-time via Wi-Fi; when no Wi-Fi hotspot is available, the device automatically switches to a 4G mobile network for real-time uploading, achieving a reliable online connection. Preferably, the user can select the desired Wi-Fi network name and enter the corresponding password on the touchscreen display module; if no Wi-Fi connection is available, the device uses a SIM card for 4G networking.

[0093] Preferably, the remote control device (such as a mobile terminal) can transmit control information to the microcontroller for remote control via a communication module, and display the control information and acquisition results on the touch screen display module.

[0094] In practice, the detection device also sets the detection frequency for temperature acquisition and independently sets the upper and lower limits of temperature for each temperature acquisition channel. The microcontroller acquires the temperature of each temperature acquisition channel according to the set detection frequency and provides an early warning by comparing the temperature acquired by each temperature acquisition channel with the set upper and lower limits.

[0095] Preferably, the detection frequency and the upper and lower limits of each temperature acquisition channel can be set through a remote control device (such as a mobile terminal), or through a touch display module, to achieve human-computer interaction, making it more convenient and flexible.

[0096] More preferably, when the microcontroller issues an early warning, it can provide local alarm signals or remote alarm information push, pushing the alarm information to the system platform to provide timely alarm information for on-site personnel and back-end management personnel, thereby improving safety production assurance.

[0097] It should be noted that the touch screen display module can also control temperature calibration. Through the touch screen display module, the calibration method and calibration channel can be selected. The upper and lower limits of the temperature of each temperature acquisition channel in the detection device can be set independently. Different temperature acquisition channels are placed in different test environments and have different temperature requirements. Individual settings greatly enhance the practicality and adjustability of the device, can reflect abnormal temperature conditions in a timely manner, and are more conducive to the whole-process monitoring of the temperature of key measuring points in production and testing.

[0098] During implementation, the online testing device also includes a power module for supplying power to the various modules within the device, which is compatible with both 24VDC battery power and 220VAC AC mains power.

[0099] More preferably, multiple online testing devices can be connected to the same platform for management, with each online testing device having its own device number or QR code information.

[0100] Example 2

[0101] Another specific embodiment of the present invention is a further improvement on the multi-channel online temperature detection device provided in Embodiment 1, such as... Figure 6 and Figure 7As shown, it also includes a cubic housing; a microcontroller, storage module, power module, communication module, data acquisition modules for each temperature acquisition channel, and temperature sensor identification circuit are built into the housing. The front panel of the housing has a six-pin aviation connector female for each temperature sensor module in each temperature acquisition channel, which connects to the male connector of the temperature sensor module in each temperature acquisition channel. The male and female connectors have limit slots for alignment during insertion. A switch for the device is located on the right side of the housing, connected to the power module, controlling the start and stop of the detection device. A touch display module is located at the center of the top surface of the housing. A memory card interface is located on the back of the housing and connected to the storage module. This design makes the online detection device compact and reliable.

[0102] The back of the casing also features a Type-C interface for connecting to the power module using a 220VAC to 5VDC adapter for power supply.

[0103] The back of the housing is also provided with an alarm interface for connecting to an alarm to enable local alarm; for example, the alarm is an audible and visual alarm light.

[0104] Understandably, the multi-channel online temperature detection device provided in this embodiment can be applied to scenarios such as online measurement, production site safety management and control, and process quality control. It can realize online detection and monitoring of temperature field or multi-point temperature, with a wide temperature measurement range, simple operation, flexible sensor selection, complete recording function, and rich alarm methods.

[0105] Those skilled in the art will understand that all or part of the processes of the methods described in the above embodiments can be implemented by a computer program instructing related hardware, and the program can be stored in a computer-readable storage medium. The computer-readable storage medium may be a disk, optical disk, read-only memory, or random access memory, etc.

[0106] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A multi-channel online temperature detection device, characterized in that, The system includes a microcontroller, at least one temperature acquisition channel connected to the microcontroller, the temperature acquisition channel including a data acquisition module, a temperature sensor identification circuit, and a temperature sensor module; the temperature sensor module includes a six-pin aviation connector and a temperature sensor fixed to the male connector of the six-pin aviation connector; the six-pin aviation connector includes a male and a female connector, allowing switching between different types of temperature sensors by switching the male connector, and the female connector is used to connect to the temperature sensor identification circuit and the data acquisition circuit; the temperature sensor has six input terminals corresponding one-to-one with the pins of the six-pin aviation connector, used for connecting to the temperature sensor module; it also includes an output terminal for outputting an identification voltage and transmitting it as identification data to the microcontroller; the temperature sensor identification circuit is used to acquire identification data identifying the temperature sensor type of the temperature sensor module of the temperature acquisition channel and transmit the identification data to the microcontroller; the temperature sensor identification circuit includes a first resistor and a second resistor; the first input terminal is connected to one end of the second resistor. The third input terminal is connected to one end of the first resistor; the other end of the first resistor is connected to the other end of the second resistor, and the second input terminal is connected to the common terminal of the first and second resistors. B The end of the second resistor connected to the first input terminal is grounded; the end of the first resistor connected to the third input terminal... A Connect to power supply voltage VCC This terminal, together with the common terminal B of the first and second resistors, forms an output terminal, which outputs the identification voltage. V AB ; The microcontroller is used to determine the temperature sensor type of the temperature sensor module of the corresponding temperature acquisition channel based on the identification data, and outputs a data acquisition command to the data acquisition module of the corresponding temperature acquisition channel according to the temperature sensor type; the microcontroller determines the temperature sensor type of the temperature sensor module of the corresponding temperature acquisition channel in the following way: like V AB If the value is 0, then the temperature sensor type is determined to be a PT100 temperature sensor. like If so, the temperature sensor type is determined to be a type K thermocouple sensor; like If so, the temperature sensor type is determined to be a type T thermocouple sensor; in, R 1 indicates the resistance value of the first resistor. R 2 indicates the resistance value of the second resistor; The data acquisition module is used to acquire the temperature data of the temperature sensor module according to the data acquisition instruction, and transmit the temperature data to the microcontroller. The microcontroller is also used to obtain the temperature of the temperature acquisition channel based on the received temperature data.

2. The multi-channel online temperature detection device according to claim 1, characterized in that, If the temperature sensor in the temperature sensor module is a PT100 temperature sensor, then pins 1, 2, and 3 of the six-pin aviation connector male are fixedly connected to pins A, B, and B' of the PT100 temperature sensor, respectively. If the temperature sensor in the temperature sensor module is a T-type thermocouple, then pins 4 and 5 of the six-pin aviation connector male are fixedly connected to the positive and negative pins of the T-type thermocouple sensor, respectively, and pins 1 and 2 of the six-pin aviation connector are shorted. If the temperature sensor in the temperature sensor module is a type K thermocouple sensor, then pins 4 and 5 of the six-pin aviation connector male are fixedly connected to the positive and negative pins of the type K thermocouple temperature sensor, respectively.

3. The multi-channel online temperature detection device according to claim 1, characterized in that, The data acquisition module is equipped with multiple data acquisition circuits; the data acquisition module selects the corresponding data acquisition circuit according to the temperature sensor type in the data acquisition instruction to acquire the real-time resistance value or millivolt value of the temperature sensor and uses the data as temperature data; The microcontroller also stores a temperature lookup table of temperature values ​​corresponding to different resistance values ​​or millivolt values ​​of each temperature acquisition channel. When temperature data is received, the corresponding temperature value is determined based on the correspondence between the resistance value or millivolt value in the temperature data and the temperature of the corresponding temperature acquisition channel, and this value is used as the temperature of that temperature acquisition channel.

4. The multi-channel online temperature detection device according to claim 3, characterized in that, The temperature lookup table for each temperature acquisition channel stores discrete values ​​sequentially. n The temperature value corresponding to a resistance value or millivolt value; When the microcontroller receives temperature data, it determines the resistance value or millivolt value within that temperature data. Y x The corresponding resistance or millivolt range in the corresponding temperature range [ Y i , Y i+1 ], and the corresponding temperature range [ T i , T i+1 The temperature of the temperature acquisition channel is obtained using the following formula. T x : 。 5. The multi-channel online temperature detection device according to claim 4, characterized in that, The microcontroller performs temperature calibration and correction on the temperature reference table before the detection device starts detection, including: The temperature sensor modules of each temperature acquisition channel are sequentially placed into standard temperature sources at different temperature points. The microcontroller continuously acquires the temperature of each temperature point and averages it. When the average temperature value stabilizes, the resistance value or millivolt value corresponding to each temperature point is calibrated and stored in the corresponding temperature lookup table.

6. The multi-channel online temperature detection device according to claim 1, characterized in that, The detection device also includes a touch screen display module, a storage module, and a communication module connected to the microcontroller; The touch screen display module is used to display the temperature of each temperature acquisition channel and the corresponding sensor type obtained by the microcontroller in real time; The storage module is used to store the temperatures of each temperature acquisition channel obtained by the microcontroller in real time. The communication module is used to connect the microcontroller to the network via WIFI or 4G for remote communication.

7. The multi-channel online temperature detection device according to claim 1, characterized in that, The detection device also sets the detection frequency for temperature acquisition and independently sets the upper and lower limits of temperature for each temperature acquisition channel. The microcontroller acquires the temperature of each temperature acquisition channel according to the set detection frequency and provides an early warning by comparing the temperature acquired by each temperature acquisition channel with the set upper and lower limits.

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