A self-checking remotely controlled temperature measuring device based on bimetallic strip

Abstract

The present invention provides a self-checking remote-controlled temperature measuring device based on a bimetallic strip, which relates to the field of temperature measurement technology, and includes: a bimetallic strip device, wherein the bending degree of the bimetallic strip device changes with the change of temperature; a distance measuring module; a display module; a single-chip microcomputer, wherein the single-chip microcomputer receives a distance signal and converts it into a corresponding temperature signal and sends it to the display module; the single-chip microcomputer module receives a self-checking signal and sends the self-checking signal to the self-checking module; the single-chip microcomputer receives a current signal and analyzes the degree of rust, converts the degree of rust into a rust signal and sends it to the display module; the single-chip microcomputer module receives a temperature measurement signal and sends a distance measurement signal to the distance measurement module. The present invention mainly utilizes a detection device provided with a bimetallic strip to realize the detection function in a small space, and at the same time accurately detects the accuracy of the temperature measuring device by providing a self-checking module.

Description

Technical Field

[0001] The present invention relates to the technical field of temperature measurement, and in particular to a self-checking remotely controlled temperature measuring device based on a bimetallic strip. Background Art

[0002] Nowadays, as ships are frequently used, the safety of ship engine rooms has become a top priority. Since ship engine rooms have many machines, high power and high temperature, it is even more necessary to monitor the temperature closely. Once the temperature is abnormal, it may cause parts failure or even fire, resulting in loss of life and property. Therefore, strict monitoring of ship engine room temperature is crucial to ensure life safety.

[0003] At present, infrared thermal imaging instruments are widely used as temperature measuring instruments in ship cabins. However, such instruments are expensive, especially because the equipment in the cabin is large and numerous, the equipment overlaps highly, and it is impossible to fully observe from any angle. If you want to fully monitor, the number of thermal imaging instruments needs to be doubled, and the cost is too high. This has also led to the current shortage of thermal imagers in most cabins. In addition, in order to improve the cargo and passenger capacity, the cabin space has been compressed to be extremely small, and the size of infrared thermal imaging instruments is relatively large. Some thinner pipes or some narrow places still require staff to hold other small temperature measuring instruments to complete the temperature measurement. However, since the cabin has been kept relatively closed and high temperature for a long time, and most cabins have dangerous sources such as gas cylinders, the risk factor of working in the cabin is extremely high. All kinds of manual operation accidents have occurred frequently, so the construction of remotely controlled unmanned cabins is imminent. In addition, for all kinds of ships, since they spend most of their time on the water, the ship's engine room is not only hot but also very humid. The aging and corrosion of temperature measuring instrument components are very common, which leads to the problem that the measurement accuracy of the temperature measuring instrument is constantly reduced during use, but the degree of error cannot be determined. The instrument can only be judged to be invalid when unreasonable temperature data appears. For some temperature monitoring used to evaluate the operating status of the unit, long-term inaccurate temperature data will seriously affect the evaluation results and cause wrong judgments.

[0004] Based on the above, a temperature measuring device with low cost, small size, remote control and precision self-checking function is urgently needed in the environment such as the cabin. Summary of the invention

[0005] According to the above technical problems that the existing ship engine room temperature monitoring technology cannot be applied in a small space and does not have a self-checking function, a self-checking remote-controlled temperature measuring device based on a bimetallic strip is provided. The present invention mainly utilizes a detection device provided with a bimetallic strip to realize the detection function in a small space, and at the same time accurately detects the accuracy of the temperature measuring device by providing a self-checking module.

[0006] The technical means adopted by the present invention are as follows:

[0007] A self-checking remotely controlled temperature measuring device based on a bimetallic strip, comprising:

[0008] A bimetallic strip device, wherein the bending degree of the bimetallic strip device changes with the change of temperature. When the bending degree of the bimetallic strip device increases, the distance between the middle part of the bimetallic strip device and the ranging module becomes farther, and when the bending degree of the bimetallic strip device decreases, the distance between the middle part of the bimetallic strip device and the ranging module becomes closer;

[0009] A distance measuring module, which measures the distance to the middle of the bimetallic device after receiving the distance measuring signal, and converts the measured distance value into a distance signal and sends it to the single chip microcomputer;

[0010] A self-checking module, which detects the current value of the bimetallic device after receiving the self-checking signal, and converts the measured current value into a current signal and sends it to the single-chip microcomputer;

[0011] A display module, wherein the display module includes a display screen, wherein the display module receives a display signal and converts it into a corresponding display control to display information on the display screen; the display module receives a corrosion signal and converts it into corrosion information to display on the display screen; the display module receives a temperature signal and converts it into temperature information to display on the display screen;

[0012] A Wifi module, which receives a temperature measurement request signal or a self-test request signal from the control terminal and sends it to the single-chip microcomputer;

[0013] A single-chip microcomputer receives a distance signal and converts it into a corresponding temperature signal and sends it to a display module; the single-chip microcomputer module receives a self-test request signal and sends the self-test signal to the self-test module; the single-chip microcomputer receives a current signal and analyzes the degree of corrosion, converts the degree of corrosion into a corrosion signal and sends it to the display module; the single-chip microcomputer module receives a temperature measurement request signal and sends a distance measurement signal to the distance measurement module.

[0014] Further, the bimetallic strip device comprises a first metal strip, a second metal strip, a first fixer, and a second fixer;

[0015] The first metal sheet and the second metal sheet are tightly pressed and fixed on the first fixture, the front side of the first metal sheet faces the ranging module, the second fixture is arranged on the upper end of the first fixture, the distance between the first fixture and the second fixture is greater than the length of the stainless steel spring sheet, and the second fixture is used to fix the first metal sheet and the second metal sheet between the second fixture and the first fixture.

[0016] Furthermore, the first metal sheet and the second metal sheet have the same size, the expansion coefficient of the first metal sheet is greater than the expansion coefficient of the second metal sheet, and the difference between the expansion coefficients of the first metal sheet and the second metal sheet is greater than 10% of the expansion coefficient of the second metal sheet.

[0017] Furthermore, the self-test module includes a coil, a stainless steel spring, a spring and a magnet. Two fixed ends of equal height are arranged on both sides of the first metal sheet and the second metal sheet between the first fixer and the second fixer. The fixed ends are connected to the bimetallic device side in sequence with a spring, a coil and a stainless steel spring. Magnets with opposite polarities are arranged on the upper and lower sides of the coil respectively.

[0018] Furthermore, the winding directions of the coils on both sides are opposite, the polarities of the upper magnets on both sides are the same, and the polarities of the lower magnets on both sides are the same.

[0019] Furthermore, the temperature measuring method of the temperature measuring device comprises the following steps:

[0020] Temperature calibration: measure the distance between the distance measuring module and the middle of the bimetallic strip device at different known temperatures, and calibrate the distance values ​​corresponding to all temperatures within the required temperature range to obtain the calibrated distance-temperature corresponding values;

[0021] Inputting the calibrated distance-temperature corresponding value into the single-chip microcomputer;

[0022] The bimetallic strip device is placed in the cabin to be tested, and the control end sends a temperature measurement signal to the Wifi module;

[0023] The Wifi module receives a temperature measurement request signal from the control terminal and sends it to the single chip microcomputer;

[0024] The single chip microcomputer receives a temperature measurement request signal and sends a distance measurement signal to the distance measurement module;

[0025] The distance measuring module measures the distance to the upper part of the bimetallic strip device after receiving the distance measuring signal, and converts the measured distance value into a distance signal and sends it to the single chip microcomputer;

[0026] The single chip microcomputer receives the distance signal and obtains the temperature value corresponding to the distance according to the calibrated distance-temperature correspondence value, generates a corresponding temperature signal and sends it to the display module;

[0027] The display module receives the temperature signal and converts it into temperature information for display on the display screen.

[0028] Furthermore, when the temperature is calibrated, The value is less than or equal to 10 -3 When the temperature is of the order of magnitude, calibration is performed by measuring several points and then fitting the linear relationship between distance and temperature. The value is greater than 10-3 When the distance and temperature are in the order of magnitude, the corresponding values ​​of distance and temperature within a certain temperature range are continuously measured for calibration, where K is the bimetallic strip bending ratio, x is the straight-line distance between the distance measurement point on the bimetallic strip and the second fixture, δ is the bimetallic strip thickness, and Δt is the temperature difference.

[0029] Furthermore, the self-checking method of the self-checking module comprises the following steps:

[0030] The control end sends a self-test request signal to the Wifi module;

[0031] The Wifi module receives the self-test signal and sends it to the single-chip microcomputer;

[0032] The single chip microcomputer receives a self-test request signal and sends a self-test signal to a self-test module;

[0033] After receiving the self-test request signal, the self-test module energizes the coils on both sides at the same time, and the coils move toward the bimetallic device under the action of the upper and lower magnets;

[0034] The movement of the coils on both sides drives the stainless steel springs on both sides to contact the bimetallic device;

[0035] The circuit of the stainless steel spring and the bimetallic device is energized, and the self-test module measures the current value in the circuit;

[0036] The self-check module converts the measured current value into a current signal and sends it to the single chip microcomputer;

[0037] The single chip microcomputer receives the current signal and analyzes the degree of corrosion, and sends the degree of corrosion to the corrosion signal which is sent to the display module;

[0038] The display module receives the corrosion signal and converts it into corrosion information for display on the display screen.

[0039] Further, the analysis of the degree of corrosion includes the following methods:

[0040] When the current value decreases, the resistance of the bimetallic device increases and the degree of corrosion worsens;

[0041] The loop current consisting of the newly made bimetallic device and the stainless steel spring is taken as the initial value. When the measured current value change reaches 0.8 of the initial value, the degree of rust is judged to be serious.

[0042] Compared with the prior art, the present invention has the following advantages:

[0043] The present invention is provided with a self-checking module, which solves the problem that the aging degree of the core components of the temperature measuring instrument cannot be known.

[0044] The present invention is provided with a bimetallic strip device, which indirectly measures the temperature of the ship's engine room by measuring the bending degree of the bimetallic strip. Compared with traditional infrared thermal imaging instruments, such a device has a smaller size and lower costs.

[0045] The present invention is provided with a Wifi module, realizes the function of remote temperature measurement, and avoids the high-risk behavior of manual operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0047] Figure 1 It is a schematic diagram of the structural principle of the present invention.

[0048] Figure 2 It is a schematic diagram of the structure of the self-check module of the present invention when no self-check is performed.

[0049] Figure 3 It is a structural schematic diagram of the self-check module of the present invention when performing self-check.

[0050] Figure 4 This is a circuit diagram of the coil connection in the self-test module of the present invention.

[0051] Figure 5 It is a connection circuit diagram of the stainless steel spring and the bimetallic strip in the self-test module of the present invention.

[0052] In the figure: 1. first metal sheet; 2. second metal sheet; 3. first fixture; 4. second fixture; 5. coil; 6. stainless steel spring; 7. spring; 8. magnet; 9. fixed end. DETAILED DESCRIPTION

[0053] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0054] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0055] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0056] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, the numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0057] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0058] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0059] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0060] like Figure 1-5 As shown, the present invention provides a self-checking remotely controlled temperature measuring device based on a bimetallic strip, comprising:

[0061] A bimetallic strip device, wherein the bending degree of the bimetallic strip device changes with the change of temperature. When the bending degree of the bimetallic strip device increases, the distance between the middle part of the bimetallic strip device and the ranging module becomes farther, and when the bending degree of the bimetallic strip device decreases, the distance between the upper part of the bimetallic strip device and the ranging module becomes closer; the first metal sheet 1 and the second metal sheet 2 have the same size, the first metal sheet 1 and the second metal sheet 2 have the same size, the expansion coefficient of the first metal sheet 1 is greater than the expansion coefficient of the second metal sheet 2, and the difference between the expansion coefficients of the first metal sheet 1 and the second metal sheet 2 is greater than 10% of the expansion coefficient of the second metal sheet 2.

[0062] The self-test module includes a coil 5, a stainless steel spring 6, a spring 7 and a magnet 8. Two fixed ends 9 of equal height are arranged on both sides of the first metal sheet 1 and the second metal sheet 2 between the first fixture 3 and the second fixture 4. The fixed ends 9 are connected to the spring 7, the coil 5 and the stainless steel spring 6 in sequence toward the bimetallic device side. Magnets 8 with opposite polarities are arranged on the upper and lower sides of the coil 5, respectively.

[0063] In the bimetallic structure, the choice of two metals is not limited. It is recommended that the difference in expansion coefficients can reach more than 10% of the smaller expansion coefficient. The bimetallic strips are of the same size and are tightly connected together by pressing. The second metal strip 2 is placed and fixed on the base facing the ranging module. Do not place the cut surface containing the bimetallic strip facing the ranging module. In order to realize the self-test function, the bimetallic strip is provided with two fixers, such as Figure 2 As shown, the bimetallic strip between the fixtures 1 and 2 is completely fixed, and the bimetallic strip on the fixture 1 is not fixed in other ways and can bend. Before measuring the temperature, the distance and temperature between the bimetallic strip and the ranging module need to be calibrated, that is, under known temperature conditions, the ranging module measures the distance to the middle of the bimetallic strip, and calibrates the distance values ​​corresponding to all temperatures within the required temperature range. It should be noted here that when calibrating the distance, the ranging module and the bimetallic strip need to be fixed on the bottom plate in advance. The thermal bending parameter calculation model of the bimetallic strip fixed in the form of a cantilever arm is:

[0064] Where: f(x) is the bending amount of the metal strip, x is the straight-line distance from the measuring point on the bimetal strip to the second fixture 4, K is the specific bending of the bimetal strip, δ is the thickness of the bimetal strip, and Δt is the temperature difference.

[0065] It is known that when The value is less than or equal to 10 -3 When the temperature difference is of the order of magnitude, the bending amount can be approximately considered to be in a linear relationship, that is, the linear relationship between distance and temperature can be fitted by measuring several points for calibration; when The value is greater than 10 -3 When the temperature difference is in the order of magnitude, the temperature difference and the bending amount are nonlinearly related. To ensure the accuracy of temperature measurement, it is necessary to continuously measure the relationship between the distance and temperature within a certain temperature range for calibration. Then, the corresponding values ​​of the calibrated distance and temperature are input into the single chip microcomputer. It should also be noted that the size of the bimetallic strip in the present invention is not limited and can be selected according to actual conditions.

[0066] The distance measuring module measures the distance to the middle of the bimetallic strip device after receiving the distance measuring signal, and converts the measured distance value into a distance signal and sends it to the single chip microcomputer; the distance measuring module can adopt an infrared distance measuring method, for example, the VL6180x module can be selected, and its measurement range is 5-100mm, and the measurement accuracy is ±3%.

[0067] A self-check module, which detects the current value of the bimetallic device after receiving the self-check signal, and converts the measured current value into a current signal and sends it to the single-chip computer; the self-check module includes a coil 5, a stainless steel spring 6, a spring 7 and a magnet 8, and two fixed ends 9 of equal height are arranged on both sides of the first metal sheet 1 and the second metal sheet 2 between the first fixture 3 and the second fixture 4, and the fixed ends 9 are sequentially connected to the bimetallic device side with a spring 7, a coil 5 and a stainless steel spring 6, and magnets 8 with opposite polarities are arranged on the upper and lower sides of the coil 5. The winding directions of the coils 5 on both sides are opposite, the polarities of the upper magnets 8 on both sides are the same, and the polarities of the lower magnets 8 on both sides are the same.

[0068] The function of the self-test module is to detect the aging degree of the temperature measuring device. The self-test principle in the present invention is based on the principle that metal resistance usually increases with the increase of corrosion degree. The corrosion degree of the bimetallic strip is determined by measuring its resistance. According to the relationship between resistance and current R=U / I, the decrease of current represents the increase of resistance, that is, the corrosion degree is aggravated. Usually, the current of the loop composed of a newly made bimetallic strip and a stainless steel spring is 1. When the current changes by more than 20%, that is, 0.8 of the initial value, it is considered that the corrosion is serious and reaches the warning value, and it is recommended to replace it.

[0069] A display module, the display module includes a display screen, the display module receives a display signal and converts it into a corresponding display control to display information on the display screen; the display module receives a corrosion signal and converts it into corrosion information between 0 and 1 to display on the display screen; the display module receives a temperature signal and converts it into temperature information to display on the display screen;

[0070] Wifi module, the Wifi module receives the temperature measurement signal or the self-test signal sent by the control terminal and sends it to the single-chip microcomputer; the purpose of the Wifi module is to realize the remote control function, and the Wifi module can select ESP8266 to facilitate connection with the single-chip microcomputer.

[0071] A single-chip microcomputer receives a distance signal and converts it into a corresponding temperature signal and sends it to a display module; the single-chip microcomputer module receives a self-test request signal and sends the self-test signal to the self-test module; the single-chip microcomputer receives a current signal and analyzes the degree of corrosion, converts the degree of corrosion into a corrosion signal and sends it to the display module; the single-chip microcomputer module receives a temperature measurement request signal and sends a distance measurement signal to the distance measurement module.

[0072] The temperature measuring method of the temperature measuring device comprises the following steps:

[0073] Temperature calibration: Measure the distance between the distance measuring module and the middle of the bimetallic strip device at different known temperatures, and calibrate the distance values ​​corresponding to all temperatures within the required temperature range to obtain the calibrated distance-temperature corresponding values. The value is less than or equal to 10 -3 When the temperature is of the order of magnitude, calibration is performed by measuring several points and then fitting the linear relationship between distance and temperature. The value is greater than 10 -3 When the distance and temperature are in the order of magnitude, the corresponding values ​​of the distance and temperature within a certain temperature range are continuously measured for calibration. Here, K is the specific bending of the bimetallic strip, x is the straight-line distance between the distance measurement point on the bimetallic strip and the second fixture 4, δ is the thickness of the bimetallic strip, and Δt is the temperature difference.

[0074] Inputting the calibrated distance-temperature corresponding value into the single-chip microcomputer;

[0075] The bimetallic strip device is placed in the cabin to be tested, and the control end sends a temperature measurement signal to the Wifi module;

[0076] The Wifi module receives a temperature measurement request signal from the control terminal and sends it to the single chip microcomputer;

[0077] The single chip microcomputer receives a temperature measurement request signal and sends a distance measurement signal to the distance measurement module;

[0078] The distance measuring module measures the distance to the middle of the bimetallic device after receiving the distance measuring signal, and converts the measured distance value into a distance signal and sends it to the single chip microcomputer;

[0079] The single chip microcomputer receives the distance signal and obtains the temperature value corresponding to the distance according to the calibrated distance-temperature correspondence value, generates a corresponding temperature signal and sends it to the display module;

[0080] The display module receives the temperature signal and converts it into temperature information for display on the display screen.

[0081] The self-test method of the self-test module comprises the following steps:

[0082] The control end sends a self-test request signal to the Wifi module;

[0083] The Wifi module receives the self-test signal and sends it to the single-chip microcomputer;

[0084] The single chip microcomputer receives a self-test request signal and sends a self-test signal to a self-test module;

[0085] After receiving the self-test request signal, the self-test module energizes the coils 5 on both sides at the same time, and the coils 5 move toward the bimetallic device side under the action of the upper and lower magnets 8;

[0086] The movement of the coils 5 on both sides drives the stainless steel springs 6 on both sides to contact the bimetallic device;

[0087] The stainless steel spring 6 and the circuit of the bimetallic device are energized, and the self-test module measures the current value in the circuit;

[0088] The self-check module converts the measured current value into a current signal and sends it to the single chip microcomputer;

[0089] The single chip microcomputer receives the current signal and analyzes the degree of corrosion, and sends the degree of corrosion to the corrosion signal to the display module; when the current value decreases, the resistance of the bimetallic device increases, and the degree of corrosion increases;

[0090] The loop current consisting of the newly manufactured bimetallic device and the stainless steel spring 6 is taken as the initial value. When the measured current value changes to 0.8 of the initial value, the degree of corrosion is judged to be serious.

[0091] The display module receives the corrosion signal and converts it into corrosion information for display on the display screen.

[0092] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A self-checking remote-controlled temperature measuring device based on a bimetallic strip, characterized in that: include: A bimetallic strip device, wherein the bending degree of the bimetallic strip device changes with the change of temperature. When the bending degree of the bimetallic strip device increases, the distance between the middle part of the bimetallic strip device and the ranging module becomes farther, and when the bending degree of the bimetallic strip device decreases, the distance between the middle part of the bimetallic strip device and the ranging module becomes closer; A distance measuring module, which measures the distance to the middle of the bimetallic device after receiving the distance measuring signal, and converts the measured distance value into a distance signal and sends it to the single chip microcomputer; A self-checking module, which detects the current value of the bimetallic device after receiving the self-checking signal, and converts the measured current value into a current signal and sends it to the single-chip microcomputer; A display module, wherein the display module includes a display screen, wherein the display module receives a display signal and converts it into a corresponding display control to display information on the display screen; the display module receives a corrosion signal and converts it into corrosion information to display on the display screen; the display module receives a temperature signal and converts it into temperature information to display on the display screen; A Wifi module, which receives a temperature measurement request signal or a self-test request signal from the control terminal and sends it to the single-chip microcomputer; A single-chip microcomputer receives a distance signal and converts it into a corresponding temperature signal and sends it to a display module; the single-chip microcomputer receives a self-test signal and sends the self-test signal to a self-test module; the single-chip microcomputer receives a current signal and analyzes the degree of corrosion, converts the degree of corrosion into a corrosion signal and sends it to a display module; the single-chip microcomputer module receives a temperature measurement signal and sends a distance measurement signal to a distance measurement module.

2. The self-checking remote-controlled temperature measuring device based on bimetallic strip according to claim 1 is characterized in that: The bimetallic strip device comprises a first metal strip (1), a second metal strip (2), a first fixer (3), and a second fixer (4); The first metal sheet (1) and the second metal sheet (2) are tightly pressed and fixed on the first fixture (3); the front side of the first metal sheet (1) faces the distance measurement module; the upper end of the first fixture (3) is provided with a second fixture (4); the distance between the first fixture (3) and the second fixture (4) is greater than the length of the stainless steel spring sheet (6); the second fixture (4) is used to fix the first metal sheet (1) and the second metal sheet (2) between the second fixture (4) and the first fixture (3).

3. The self-checking remote-controlled temperature measuring device based on bimetal strip according to claim 2 is characterized in that: The first metal sheet (1) and the second metal sheet (2) have the same size, the expansion coefficient of the first metal sheet (1) is greater than the expansion coefficient of the second metal sheet (2), and the difference between the expansion coefficients of the first metal sheet (1) and the second metal sheet (2) is greater than 10% of the expansion coefficient of the second metal sheet (2).

4. The self-checking remote-controlled temperature measuring device based on bimetallic strip according to claim 2 is characterized in that: The self-test module comprises a coil (5), a stainless steel spring (6), a spring (7) and a magnet (8); two fixed ends (9) of equal height are arranged on both sides of the first metal sheet (1) and the second metal sheet (2) between the first fixture (3) and the second fixture (4); the fixed ends (9) are connected to the spring (7), the coil (5) and the stainless steel spring (6) in sequence towards the bimetallic device side; and magnets (8) with opposite polarities are arranged on the upper and lower sides of the coil (5), respectively.

5. The self-checking remote-controlled temperature measuring device based on bimetal strip according to claim 4 is characterized in that: The winding directions of the coils (5) on both sides are opposite, the polarities of the upper magnets (8) on both sides are the same, and the polarities of the lower magnets (8) on both sides are the same.

6. The self-checking remote-controlled temperature measuring device based on bimetallic strip according to claim 4 is characterized in that: The temperature measuring method of the temperature measuring device comprises the following steps: Temperature calibration: measure the distance between the distance measuring module and the middle of the bimetallic strip device at different known temperatures, and calibrate the distance values ​​corresponding to all temperatures within the required temperature range to obtain the calibrated distance-temperature corresponding values; Inputting the calibrated distance-temperature corresponding value into the single-chip microcomputer; The bimetallic strip device is placed in the cabin to be tested, and the control end sends a temperature measurement signal to the Wifi module; The Wifi module receives a temperature measurement request signal from the control terminal and sends it to the single chip microcomputer; The single chip microcomputer receives a temperature measurement signal and sends a distance measurement signal to a distance measurement module; The distance measuring module measures the distance to the middle of the bimetallic device after receiving the distance measuring signal, and converts the measured distance value into a distance signal and sends it to the single chip microcomputer; The single chip microcomputer receives the distance signal and obtains the temperature value corresponding to the distance according to the calibrated distance-temperature correspondence value, generates a corresponding temperature signal and sends it to the display module; The display module receives the temperature signal and converts it into temperature information for display on the display screen.

7. The self-checking remote-controlled temperature measuring device based on bimetallic strip according to claim 6 is characterized in that: When temperature calibration is performed, The value is less than or equal to 10 -3 When the temperature is of the order of magnitude, calibration is performed by measuring several points and then fitting the linear relationship between distance and temperature. The value is greater than 10 -3 When the distance and temperature are in a certain temperature range, the corresponding values ​​are measured continuously for calibration, where: The bimetallic strip is bent. is the straight-line distance from the distance measurement point on the bimetallic strip to the second fixture (4), is the bimetallic strip thickness, It's the temperature difference.

8. The self-checking remote-controlled temperature measuring device based on bimetal strip according to claim 4 is characterized in that: The self-test method of the self-test module comprises the following steps: The control end sends a self-test request signal to the Wifi module; The Wifi module receives the self-test signal and sends it to the single-chip microcomputer; The single chip microcomputer receives a self-test request signal and sends a self-test signal to a self-test module; After receiving the self-test request signal, the self-test module simultaneously energizes the coils (5) on both sides, and the coils (5) move toward the bimetallic device under the action of the upper and lower magnets (8); The movement of the coils (5) on both sides drives the stainless steel springs (6) on both sides to contact the bimetallic device; The stainless steel spring (6) and the circuit of the bimetallic device are energized, and the self-test module measures the current value in the circuit; The self-check module converts the measured current value into a current signal and sends it to the single chip microcomputer; The single chip microcomputer receives the current signal and analyzes the degree of corrosion, and sends the degree of corrosion to the corrosion signal which is sent to the display module; The display module receives the corrosion signal and converts it into corrosion information for display on the display screen.

9. The self-checking remote-controlled temperature measuring device based on bimetal strip according to claim 8 is characterized in that: The analysis of the degree of corrosion includes the following methods: When the current value decreases, the resistance of the bimetallic device increases and the degree of corrosion worsens; The loop current consisting of the newly manufactured bimetallic device and the stainless steel spring (6) is taken as the initial value. When the measured current value changes to 0.8 of the initial value, the degree of corrosion is judged to be serious.

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