A device and method for compensating temperature drift error of a strain gauge sensor affected by temperature

Abstract

The present disclosure provides a device and method for compensating for temperature drift errors of strain gauge sensors affected by temperature, relating to the technical field of strain gauge sensors. The error compensation device includes a sensor body, a strain gauge, a compensation structure, and a housing. The sensor body is cylindrical, and an annular groove is formed on the outer wall of the cylinder. The annular groove is located in the middle of the axial direction, so that the cross-section of the cylinder has an "I" shape. The inner side of the strain gauge is attached to the inner wall of the annular groove, and the compensation structure is fixedly arranged on the outer side of the strain gauge. The compensation structure is annularly arranged in the annular groove and is an axial force compensation structure, a bending moment compensation structure, or a torque compensation structure. The present disclosure can continuously compensate for the influence of temperature on the sensor by changing the structural dimensions and selecting different materials, thereby improving compensation accuracy. The device has a simple structure, is easy to use, reduces on-site workload, and achieves the greatest reduction in the temperature influence caused by strain gauge sensor testing.

Description

Technical Field

[0001] The present disclosure relates to the technical field of strain gauge sensors, and in particular to a device and method for compensating temperature drift errors of strain gauge sensors affected by temperature. Background Art

[0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art.

[0003] A strain gauge sensor is constructed by attaching a strain gauge to the surface of an elastic body or directly to the test piece. The deformation of the elastic body or test piece is transmitted to the sensitive grid through the substrate and adhesive, causing a corresponding change in its resistance. This change is then converted into a voltage or current change by a conversion circuit, thus measuring the strain. If physical quantities such as displacement, force, torque, acceleration, and pressure are converted into strain through the elastic body or test piece, these quantities can be measured, resulting in various strain sensors.

[0004] However, when unstressed, the resistance of a strain gauge sensor will change at different temperatures. Furthermore, because objects experience varying degrees of volumetric change, such as expansion or contraction, at different temperatures, the thermal changes in the strain gauge resistance are superimposed on the load changes. This inevitably leads to discrepancies between the test results obtained at different temperatures and the actual values. Therefore, appropriate compensation methods must be employed to correct this error.

[0005] Currently, most methods measure the value of a strain gauge sensor at different temperatures without an external load. Materials with large temperature coefficients, such as copper, nickel resistors, and cobalt-nickel alloys, are connected to a circuit to compensate for temperature-induced changes in the sensor value. Alternatively, circuit compensation is employed. This involves finding the arm with the smallest resistance temperature coefficient in a bridge circuit, measuring the change in resistance at different temperatures, and then inserting a temperature compensation resistor with a larger resistance temperature coefficient in series to compensate for temperature changes.

[0006] However, the above-mentioned existing compensation methods are limited by subjective experience and have a strong subjective influence. Only through repeated adjustments can they basically meet the use of scenarios with large temperature changes. In addition, most of the time it is difficult to find materials with theoretical temperature coefficients and resistors with corresponding resistance values, making it difficult to perform continuous and accurate compensation. Summary of the Invention

[0007] To address the above-mentioned issues, the present disclosure proposes a device and method for compensating for the temperature drift error of a strain gauge sensor affected by temperature, and improves a compensation structure that can provide different compensation forces by continuously modifying the structural dimensions and selecting different materials, thereby continuously compensating for the influence of temperature on the sensor, improving compensation accuracy, and minimizing the temperature influence on strain gauge sensor testing.

[0008] According to some embodiments, the present disclosure adopts the following technical solutions:

[0009] A temperature drift error compensation device for a strain gauge sensor affected by temperature, comprising a sensor body, a strain gauge, a compensation structure, and a housing;

[0010] The sensor body is a cylinder, and an annular groove is provided on the outer wall of the cylinder. The annular groove is located in the middle of the axial direction, so that the cross section of the cylinder is in the shape of an "I";

[0011] The inner side of the strain gauge is attached to the inner wall of the annular groove, and the compensation structure is fixedly arranged on the outer side of the strain gauge. The compensation structure is annularly arranged in the annular groove. The compensation structure is an axial force compensation structure, a bending moment compensation structure or a torque compensation structure.

[0012] Furthermore, the strain gauge is an axial force strain gauge, a bending moment strain gauge or a torque strain gauge, and the axial force strain gauge, the bending moment strain gauge or the torque strain gauge respectively corresponds to the axial force compensation structure, the bending moment compensation structure or the torque compensation structure.

[0013] Furthermore, the axial force compensation structure is a ring structure formed by connecting multiple I-beam structures with the same cross-section. The cross-section of the ring structure is circular. The I-beam structures are connected by metal glue or welding. The upper and lower ends of the axial force compensation structure are fixed in the annular groove, and the upper and lower ends of the axial force compensation structure are set to be arc-shaped.

[0014] Furthermore, the moment compensation structure includes a first moment compensation structure and a second moment compensation structure, the first moment compensation structure is composed of two semi-ring structures with different diameters, each semi-ring structure is composed of multiple I-beam structures with the same cross-section, and the length of the upper end and the lower end of the I-beam structure of one semi-ring structure is greater than the length of the upper end and the lower end of the I-beam structure of the other semi-ring structure.

[0015] Furthermore, the second bending moment compensation structure is composed of two semi-ring structures with the same diameter, each semi-ring structure is composed of multiple I-beam structures with the same cross-section, and the cross-sectional area of ​​the I-beam structure of one semi-ring structure is greater than the cross-sectional area of ​​the I-beam structure of the other semi-ring structure.

[0016] Furthermore, the torque compensation structure is composed of multiple groups of inclined structures, each group of inclined structures includes two oblique rectangular parallelepipeds, and the two oblique rectangular parallelepipeds in each group are connected at adjacent vertices.

[0017] Furthermore, a shell is provided outside the annular groove, and the shell is connected to the sensor body through a sealant.

[0018] Furthermore, the expansion coefficient of the compensation structure material is smaller than the expansion coefficient of the sensor body material.

[0019] Furthermore, the elastic modulus of the compensation structure material is smaller than the elastic modulus of the sensor body material.

[0020] According to some embodiments, the present disclosure adopts the following technical solutions:

[0021] A method for compensating a temperature drift error compensation device for a strain gauge sensor affected by temperature, characterized by comprising:

[0022] When the temperature of the sensor body changes, the resistance of the axial force strain gauge changes due to the temperature, and the axial force signal will change. If the expansion coefficient of the axial force compensation structure is smaller than that of the sensor body, the axial force compensation structure will generate a force to pull the sensor body downward to compensate for the change of the axial force strain gauge sensor caused by temperature.

[0023] Alternatively, when the temperature of the sensor body changes, the resistance of the bending moment strain gauge changes due to the temperature, and the bending moment signal of the sensor changes. The expansion coefficient of the bending moment compensation structure is smaller than that of the sensor body, and when it expands due to heat, it generates a force that pulls the sensor body downward. The two semi-ring structures composed of the first bending moment compensation structure are at different distances from the center, and generate different moments pulling the sensor body left and right, thereby compensating for the change in the bending moment signal of the sensor caused by temperature.

[0024] Alternatively, when the temperature of the sensor body changes, the resistance of the bending moment strain gauge changes due to the temperature, and the bending moment signal of the sensor changes. Since the expansion coefficient of the bending moment compensation structure is smaller than that of the sensor body material, it generates a force pulling the sensor body downward when it expands due to heat. The two semi-ring structures composed of the second bending moment compensation structure are at equal distances from the center, and the cross-sectional areas of the I-beam are different, resulting in different pulling moments on the left and right sides of the sensor body, thereby compensating for the change in the bending moment signal of the sensor caused by temperature;

[0025] Alternatively, the expansion coefficient of the torque compensation structure is smaller than that of the sensor body, and when the temperature changes, a force is generated to pull the sensor body, causing its component force to produce a directional torque change, thereby compensating for the torque change caused by temperature.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The present invention discloses a device for compensating temperature drift errors of strain gauge sensors affected by temperature. By setting different compensation structures for different strain gauge sensors, modifying the structural dimensions, and selecting different materials, the device continuously compensates for the effects of temperature on the sensors, thereby improving compensation accuracy. The device also has a simple structure, is easy to use, reduces on-site workload, and minimizes the effects of temperature on strain gauge sensor testing.

[0028] The present invention discloses a device for compensating temperature drift errors of a strain gauge sensor affected by temperature. The axial force compensation structure can effectively reduce the axial force measurement error caused by temperature changes, ensuring that the sensor provides consistent and accurate readings at different operating temperatures.

[0029] The present invention discloses a device for compensating for temperature drift errors of strain gauge sensors affected by temperature. The bending moment compensation structure can effectively reduce bending moment measurement errors caused by temperature changes, ensuring that the sensor provides consistent and accurate readings at different operating temperatures. For large temperature changes, a first bending moment compensation structure can be used. This structure does not change the cross-sectional area of ​​the I-beam, resulting in a larger unit force, higher structural stability, and better resistance to pressure or heavy loads. For smaller temperature changes, a second bending moment compensation structure can be used. This structure utilizes the difference in the cross-sectional area of ​​the I-beam to change the bending moment. This structure is easy to adjust and can achieve more precise adjustments.

[0030] The present invention discloses a device for compensating temperature drift errors of strain gauge sensors affected by temperature. The torque compensation structure can effectively reduce torque measurement errors caused by temperature changes, ensuring that the sensor provides consistent and accurate readings at different operating temperatures.

[0031] The present invention discloses a device for compensating for temperature drift errors of strain gauge sensors affected by temperature. When compensating for temperature effects, the device can pull the sensor body through forces generated by different structures, thereby compensating for signal changes caused by temperature, improving measurement accuracy, and effectively reducing force measurement errors caused by temperature changes, ensuring that the sensor provides consistent and accurate readings at different operating temperatures. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings, which constitute a part of the present disclosure, are used to provide a further understanding of the present disclosure. The exemplary embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation to the present disclosure.

[0033] Figure 1 This is a schematic diagram of the overall structure of a temperature drift error compensation device for a strain gauge sensor according to an embodiment of the present disclosure;

[0034] Figure 2 Schematic diagram of the axial force compensation structure and strain gauge sensor structure of an embodiment of the present disclosure;

[0035] Figure 3 This is a schematic diagram of the axial force compensation structure of an embodiment of the present disclosure;

[0036] Figure 4 This is a force diagram of the axial force compensation structure according to an embodiment of the present disclosure;

[0037] Figure 5 Schematic diagram of a first bending moment compensation structure according to an embodiment of the present disclosure;

[0038] Figure 6 This is a force diagram of the first bending moment compensation structure according to an embodiment of the present disclosure;

[0039] Figure 7 Schematic diagram of a second bending moment compensation structure according to an embodiment of the present disclosure;

[0040] Figure 8 This is a force diagram of the second moment compensation structure according to an embodiment of the present disclosure;

[0041] Figure 9 Schematic diagram of the torque compensation structure of an embodiment of the present disclosure;

[0042] Figure 10 This is a first schematic diagram of the force applied to the torque compensation structure according to an embodiment of the present disclosure;

[0043] Figure 11 This is a second schematic diagram of the torque compensation structure under load according to an embodiment of the present disclosure;

[0044] Among them, 1. sensor body; 2. strain gauge; 3. compensation structure; 4. sealant; 5. shell; 6. first bending moment compensation structure; 7. second bending moment compensation structure; 8. torque compensation structure; 9. axial force compensation structure.

[0045] in addition, Figure 4 、 Figure 6 、 Figure 8 、 Figure 10 、 Figure 11 The red arrow in the figure indicates the direction of force transmission. Figure 11 The red rotating arrow in the figure indicates the direction of the torque force T formed by the decomposed force. DETAILED DESCRIPTION

[0046] The present disclosure will be further described below with reference to the accompanying drawings and embodiments.

[0047] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present disclosure. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present disclosure belongs.

[0048] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present disclosure. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0049] Example 1

[0050] In one embodiment of the present disclosure, a device for compensating for temperature drift errors of a strain gauge sensor affected by temperature is provided. The device of the present disclosure can compensate for strain gauge sensor signals caused by temperature changes through different structural designs. Specific implementations are as follows:

[0051] like Figure 1 As shown, the present invention discloses a temperature drift error compensation device for a strain gauge sensor affected by temperature, comprising a sensor body 1, a strain gauge 2, a compensation structure 3, and a housing 5. The sensor body 1 is a cylinder, and an annular groove is provided on the outer wall of the cylinder. The annular groove is located in the middle of the axial direction, so that the cross section of the cylinder is in the shape of an "I"; the inner side of the strain gauge 2 is attached to the inner wall of the annular groove, and the compensation structure 3 is fixedly provided on the outer side of the strain gauge 2. The compensation structure 3 is annularly arranged in the annular groove, and the compensation structure 3 can be an axial force compensation structure, a bending moment compensation structure, or a torque compensation structure. The axial force, bending moment, or torque compensation structure can compensate for the axial force, bending moment, or torque signal caused by temperature changes. This method has a simple structure and is easy to use. It minimizes the temperature effect of temperature on strain gauge sensor testing and greatly improves work efficiency.

[0052] As an embodiment, the strain gauge 2 may be an axial force strain gauge, a bending moment strain gauge or a torque strain gauge, and the axial force strain gauge, the bending moment strain gauge or the torque strain gauge respectively correspond to the axial force compensation structure 9, the bending moment compensation structure or the torque compensation structure 8.

[0053] As an example, Figure 2 As shown, when the strain gauge sensor is an axial force strain gauge sensor, the strain gauge 2 is an axial force strain gauge, and the compensation structure is correspondingly set to an axial force compensation structure 9. The inner side of the axial force strain gauge is attached to the inner wall of the annular groove, and the axial force compensation structure 9 is fixedly set on the outer side of the axial force strain gauge. The axial force compensation structure 9 is annularly arranged in the annular groove.

[0054] Furthermore, if Figure 3 As shown, the axial force compensation structure 9 is a ring structure formed by connecting multiple I-beam structures with the same cross-section. The cross-section of the ring structure is circular. The I-beam structures are connected by metal glue or welding. The upper and lower ends of the axial force compensation structure are fixed in the annular groove, and the upper and lower ends of the axial force compensation structure 9 are configured as arcs. The I-beam structure is configured as an arc or a traditional I-shape. The upper and lower ends of the axial force compensation structure 9 are configured as arcs to increase the contact area with the metal body, and the I-beam structure can reduce weight.

[0055] As an example, the axial force compensation structure can be made of a material with a smaller expansion coefficient than the sensor body material and a smaller elastic modulus than the sensor body material, without affecting the sensor's force measurement function. For example, if the sensor body is made of 304 stainless steel, with an expansion coefficient of 17 × 10-6 m / (m·°C) and an elastic modulus of 193 GPa, the axial force compensation structure can be made of a titanium alloy with an elastic modulus of 8.6-9.8 × 10-6 m / (m·°C) and an elastic modulus of 110-120 GPa.

[0056] As an example, Figure 4 As shown in the figure, when the temperature of the axial force strain gauge sensor body changes, the resistance of the axial force strain gauge changes due to the temperature influence. The static axial force of the axial force strain gauge sensor also increases, causing the axial force signal to change. If the axial force strain gauge sensor body is made of 304 stainless steel with an expansion coefficient of 17×10^-6m / (m·°C), and the axial force compensation structure is made of titanium alloy with an expansion coefficient of 8.6-9.8×10^-6m / (m·°C), according to the expansion coefficient calculation formula A = ΔL / (L*ΔT), when thermally expanded, the titanium alloy expands less than the 304 stainless steel sensor body at the same temperature and height. When the axial force strain gauge sensor is placed with its lower end fixed, forces F1 and F2 are generated that pull the sensor body downward. Because the axial force compensation structure is evenly distributed around the circumference, the resultant force is a downward force, compensating for the axial force signal change caused by temperature changes affecting the strain gauge in a normal sensor.

[0057] In addition, by changing the cross-sectional area of ​​the arc-shaped I-beam or selecting other materials with a smaller or larger expansion coefficient than the sensor body, the structure can be changed to provide different compensation forces and continuously increase or decrease the temperature compensation value.

[0058] As an embodiment, when the strain gauge sensor is a bending moment strain gauge sensor, the strain gauge 2 is a bending moment strain gauge, and the compensation structure is correspondingly set as a bending moment compensation structure. The inner side of the bending moment strain gauge is attached to the inner wall of the annular groove, and the bending moment compensation structure is fixedly set on the outer side of the bending moment strain gauge. The bending moment compensation structure is annularly arranged in the annular groove.

[0059] Furthermore, the bending moment compensation structure includes a first bending moment compensation structure 6 and a second bending moment compensation structure 7, as shown in FIG. Figure 5 、 Figure 6As shown, the first bending moment compensation structure 6 is composed of two semi-ring structures of different diameters. Each semi-ring structure is composed of multiple I-beam structures of the same cross-section. The upper and lower ends of the I-beam structure of one semi-ring structure are longer than those of the other semi-ring structure. By varying the lengths, the semi-rings have different diameters. The first bending moment compensation structure differs from the axial force compensation structure in that the I-beam structures of the first bending moment compensation structure are spliced ​​to form two semicircles of different diameters. This allows one semicircle to be closer to the center of the sensor body and the other to be farther away, facilitating bending moment compensation.

[0060] As an embodiment, the first bending moment compensation structure may be made of a material having an expansion coefficient smaller than that of the sensor main body material, and an elastic modulus smaller than that of the sensor main body material.

[0061] As an example, Figure 6 As shown in the figure, when the temperature of the moment strain gauge sensor body changes, the resistance of the moment strain gauge changes due to the temperature, and the bending moment signal of the moment strain gauge sensor also changes. If the expansion coefficient of the first bending moment compensation structure is smaller than that of the sensor body, the thermal expansion will generate forces F1 and F2 pulling the sensor body downward. However, the two half-rings of the first bending moment compensation structure are unequally spaced from the center, resulting in inconsistent pulling torque on the sensor body, thus compensating for the temperature-induced bending moment signal changes of the sensor.

[0062] As an example, when the external temperature rises, the resistance of the moment strain gauge changes due to the temperature, and the moment signal of the moment strain gauge sensor changes. The expansion coefficient of the material of the first moment compensation structure is smaller than that of the sensor body. When heated, the upper and lower expansion degrees are smaller than the sensor body. The lower end of the sensor is fixed, generating forces F1 and F2 that pull the sensor downward and inward. The inconsistent diameters of the left and right semicircular arcs of the first moment compensation structure result in inconsistent torque relative to the center. The sensor as a whole has torque, thereby compensating for the moment value caused by temperature changes.

[0063] As an embodiment, the temperature compensation value can be continuously increased or decreased by changing the diameter of the two semi-circular arc I-beam structures or selecting other materials with a smaller or larger expansion coefficient than the sensor body to change the structure to provide different compensation forces.

[0064] like Figure 7As shown, the second moment compensation structure is composed of two connected semi-circular structures of the same diameter. Each semi-circular structure is composed of multiple connected I-beam structures of the same cross-section, and the cross-sectional area of ​​the I-beam structure of one semi-circular structure is larger than that of the I-beam structure of the other semi-circular structure. The difference between the second moment compensation structure and the first moment compensation structure is that after the two semi-circles are spliced ​​together, the diameter of the two semi-circles is the same, but the cross-sectional areas of the I-beam structures are inconsistent. One part of the I-beam has a smaller cross-sectional area, while the other part has a larger area. Due to thermal expansion, the downward pulling force generated by the two parts is inconsistent, thus generating a moment to compensate for the bending moment.

[0065] As an example, Figure 8 As shown in the figure, when the temperature of the moment strain gauge sensor changes, the resistance of the moment strain gauge changes due to the temperature influence, and the bending moment signal of the moment strain gauge sensor also changes. Because the expansion coefficient of the second moment compensation structure is smaller than that of the sensor body material, when it expands due to heat, it generates forces F1 and F2 that pull the sensor body downward. However, the two semicircular rings of the second moment compensation structure are equidistant from the center, while the cross-sectional areas of the I-beam are unequal. This expansion generates inconsistent forces, with one side smaller and the other larger. This results in inconsistent moments pulling the sensor body left and right, thus compensating for the temperature-induced changes in the sensor's bending moment signal.

[0066] As an example, when the external temperature rises, the resistance of the moment strain gauge changes due to temperature influence, causing the sensor's bending moment signal to change. The expansion coefficient of the material of the second moment compensation structure is smaller than that of the sensor body. When heated, the upper and lower expansion degrees are smaller than those of the sensor body. The lower end of the sensor is fixed, generating forces F1 and F2 that pull the sensor downward and inward. The inconsistent cross-sectional areas of the left and right semicircular I-beams of the second moment compensation structure result in inconsistent forces F1 and F2, generating inconsistent moments relative to the center. The sensor as a whole exerts torque, thereby compensating for the bending moment caused by temperature changes in the gauge.

[0067] As an embodiment, the temperature compensation value can be continuously increased or decreased by changing the cross-sectional area of ​​the two semicircular arc I-beams or selecting other materials with a smaller or larger expansion coefficient than the sensor body to change the structure to provide different compensation forces.

[0068] As an example, when temperature changes significantly, the first temperature compensation structure can be used. This structure maintains the cross-sectional area of ​​the I-beam, provides a higher unit force, and offers greater structural stability, making it easier to withstand compression or heavy loads. When temperature changes are smaller, the second temperature compensation structure can be used. This structure's cross-sectional area difference is more convenient than adjusting the distance to change the bending moment, allowing for more precise adjustment.

[0069] As an embodiment, when the strain gauge sensor is a torque strain gauge sensor, the strain gauge 2 is a torque strain gauge, and the compensation structure is correspondingly set as a torque compensation structure. The inner side of the torque strain gauge is attached to the inner wall of the annular groove, and the torque compensation structure is fixedly set on the outer side of the torque strain gauge. The torque compensation structure is annularly arranged in the annular groove.

[0070] like Figure 9 、 Figure 11 As shown, the torque compensation structure 8 is composed of multiple groups of inclined structures, each consisting of two oblique rectangular parallelepipeds. The multiple groups of inclined structures surround the annular groove, with the adjacent vertex corners of the two oblique rectangular parallelepipeds in each group connected. The adjacent vertex corners between the multiple oblique rectangular parallelepipeds enhance the stability of the overall structure, distribute the load, and thus improve the compressive and bending resistance.

[0071] As an example, when the temperature of the torque strain gauge sensor changes, the resistance of the torque strain gauge changes due to the temperature, and the torque signal of the torque strain gauge sensor also changes. If the expansion coefficient of the torque compensation structure is smaller than that of the sensor body, the rhombus generates a force that pulls on the sensor body, causing its force component to produce a directional torque change, thereby compensating for the torque change caused by temperature.

[0072] like Figure 10 、 Figure 11 As shown in the figure, when the external temperature rises, the torque strain gauge itself changes resistance due to the temperature, and the sensor torque signal changes. The expansion coefficient of the torque compensation structure material is smaller than the expansion coefficient of the sensor body material. When heated, the degree of expansion is smaller than that of the sensor body. The lower end of the sensor is fixed, so a force F1 is generated relative to the sensor, pulling the sensor downward. F1 can be decomposed into F2 and F3. F2 is offset by the force of the lower end fixing the sensor, and F3 generates a torque T. The direction of this torque force is as follows: Figure 11 As shown by the rotating arrow in the figure, the torque value caused by the change of the sheet due to temperature change is compensated.

[0073] As an embodiment, other materials with expansion coefficients smaller or larger than that of the sensor body may be selected to change the structure to provide different compensation forces and continuously increase or decrease the temperature compensation value.

[0074] Furthermore, if Figure 1 As shown, a temperature drift error compensation device for a strain gauge sensor affected by temperature further includes a housing 5, and the sensor body 1 and the inner side of the housing 5 are connected together by a sealant 4 to facilitate fixing and protecting the strain gauge and the compensation structure.

[0075] As an embodiment, the sensor body 1 and the inner side of the housing 5 may also be fixed by welding.

[0076] Example 2

[0077] In one embodiment of the present disclosure, a method for compensating a temperature drift error of a strain gauge sensor affected by temperature is provided, comprising:

[0078] When the temperature of the sensor body changes, the resistance of the axial force strain gauge changes due to the temperature, and the axial force signal will change. If the expansion coefficient of the axial force compensation structure is smaller than that of the sensor body, the axial force compensation structure will generate a force to pull the sensor body downward to compensate for the change of the axial force strain gauge sensor caused by temperature.

[0079] As an embodiment, when the temperature of the sensor body changes, the resistance of the bending moment strain gauge changes due to the temperature, and the bending moment signal of the sensor changes. The expansion coefficient of the bending moment compensation structure is smaller than that of the sensor body. When it expands due to heat, it generates a force that pulls the sensor body downward. The two semi-ring structures composed of the first bending moment compensation structure are at different distances from the center, generating different moments pulling the sensor body left and right, thereby compensating for the change in the bending moment signal of the sensor caused by temperature.

[0080] As an embodiment, when the temperature of the sensor body changes, the resistance of the bending moment strain gauge changes due to the temperature, and the bending moment signal of the sensor changes. Because the expansion coefficient of the bending moment compensation structure is smaller than that of the sensor body material, it generates a force pulling the sensor body downward when it expands due to heat. The two semi-ring structures composed of the second bending moment compensation structure are equidistant from the center, but have different cross-sectional areas of the I-beam, which generates different pulling moments on the left and right sides of the sensor body, thereby compensating for the change in the bending moment signal of the sensor caused by temperature.

[0081] As an embodiment, the expansion coefficient of the torque compensation structure is smaller than that of the sensor body. When the temperature changes, a force is generated to pull the sensor body, causing its component force to produce a directional torque change, thereby compensating for the torque change caused by temperature.

[0082] As an embodiment, if the expansion coefficient of the compensation structure is greater than the expansion coefficient of the sensor body, the structure is changed to provide different compensation forces, thereby compensating for different signal changes caused by temperature.

[0083] The present disclosure is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present disclosure. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 a process or multiple processes and / or boxes Figure 1A device that provides the functions specified in a block or multiple blocks.

[0084] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0085] Although the above describes the specific implementation methods of the present disclosure in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present disclosure. Those skilled in the art should understand that on the basis of the technical solution of the present disclosure, various modifications or variations that can be made by those skilled in the art without creative work are still within the scope of protection of the present disclosure.

Claims

1. A device for compensating temperature drift errors of a strain gauge sensor affected by temperature, characterized in that: It includes a sensor body, a strain gauge, a compensation structure and a housing; The sensor body is a cylinder, and an annular groove is provided on the outer wall of the cylinder. The annular groove is located in the middle position of the axial direction, so that the cross section of the cylinder is in the shape of an "I"; The inner side of the strain gauge is attached to the inner wall of the annular groove, and the compensation structure is fixedly arranged on the outer side of the strain gauge. The compensation structure is annularly arranged in the annular groove, and the compensation structure is an axial force compensation structure, a bending moment compensation structure, or a torque compensation structure; The strain gauge is an axial force strain gauge, a bending moment strain gauge or a torque strain gauge, and the axial force strain gauge, the bending moment strain gauge or the torque strain gauge respectively corresponds to the axial force compensation structure, the bending moment compensation structure or the torque compensation structure; the expansion coefficient of the compensation structure material is smaller than the expansion coefficient of the sensor main body material; the elastic modulus of the compensation structure material is smaller than the elastic modulus of the sensor main body material.

2. The device for compensating temperature drift error of a strain gauge sensor affected by temperature as claimed in claim 1, characterized in that: The axial force compensation structure is a ring structure formed by connecting multiple I-beam structures with the same cross-section. The cross-section of the ring structure is circular. The I-beam structures are connected by metal glue or welding. The upper and lower ends of the axial force compensation structure are fixed in the annular groove, and the upper and lower ends of the axial force compensation structure are set to be arc-shaped.

3. The device for compensating temperature drift error of a strain gauge sensor affected by temperature as claimed in claim 1, characterized in that: The bending moment compensation structure includes a first bending moment compensation structure and a second bending moment compensation structure. The first bending moment compensation structure is composed of two semi-ring structures with different diameters. Each semi-ring structure is composed of multiple I-beam structures with the same cross-section. The length of the upper end and the lower end of the I-beam structure of one semi-ring structure is greater than the length of the upper end and the lower end of the I-beam structure of the other semi-ring structure.

4. The device for compensating temperature drift error of a strain gauge sensor affected by temperature as claimed in claim 3, characterized in that: The second bending moment compensation structure is composed of two semi-ring structures with the same diameter, each semi-ring structure is composed of multiple I-beam structures with the same cross-section, and the cross-sectional area of ​​the I-beam structure of one semi-ring structure is larger than the cross-sectional area of ​​the I-beam structure of the other semi-ring structure.

5. The device for compensating temperature drift error of a strain gauge sensor affected by temperature as claimed in claim 1, characterized in that: The torque compensation structure is composed of multiple groups of inclined structures, each group of inclined structures includes two oblique rectangular parallelepipeds, and the two oblique rectangular parallelepipeds in each group are connected at adjacent apex angles.

6. The device for compensating temperature drift error of a strain gauge sensor affected by temperature as claimed in claim 1, characterized in that: The elastic modulus of the compensation structure material is smaller than the elastic modulus of the sensor body material.

7. A compensation method for a temperature drift error compensation device for a strain gauge sensor affected by temperature according to any one of claims 1 to 6, characterized in that: include: When the temperature of the sensor body changes, the resistance of the axial force strain gauge changes due to the temperature, and the axial force signal will change. If the expansion coefficient of the axial force compensation structure is smaller than that of the sensor body, the axial force compensation structure will generate a force to pull the sensor body downward to compensate for the change of the axial force strain gauge sensor caused by temperature. Alternatively, when the temperature of the sensor body changes, the resistance of the bending moment strain gauge changes due to the influence of temperature, and the bending moment signal of the sensor changes. The expansion coefficient of the bending moment compensation structure is smaller than that of the sensor body, and a force pulling the sensor body downward is generated when it expands due to heat. The two semi-ring structures composed of the first bending moment compensation structure are at different distances from the center, and different torques are generated to pull the sensor body to the left and right, thereby compensating for the change in the bending moment signal of the sensor caused by temperature; alternatively, when the temperature of the sensor body changes, the resistance of the bending moment strain gauge changes due to the influence of temperature, and the bending moment signal of the sensor changes. The expansion coefficient of the bending moment compensation structure is smaller than that of the material of the sensor body, and a force pulling the sensor body downward is generated when it expands due to heat. The two semi-ring structures composed of the second bending moment compensation structure are at the same distance from the center, and the cross-sectional areas of the I-beam are different, resulting in different torques pulling the sensor body to the left and right, thereby compensating for the change in the bending moment signal of the sensor caused by temperature; alternatively, the expansion coefficient of the torque compensation structure is smaller than that of the sensor body, and a force pulling the sensor body is generated when the temperature changes, causing its component force to produce a directional torque change, thereby compensating for the torque change caused by temperature.

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