Non-intrusive torque sensor and torque measurement structure having the same

Abstract

The present application relates to a non-intrusive torque sensor, which is suitable for measuring the torque of a shaft structure, including a left clasp, a right clasp, a connecting part and a strain gauge. The left clasp and the right clasp have the same structure, and are both provided with a groove at the bottom, which matches the shaft to be measured. There is a preset distance between the left clasp and the right clasp, and the upper part is connected by a connecting part, which is a sheet-like structure. The strain gauge is bonded to the connection between the connecting part and the left clasp and / or the right clasp, and the left clasp, the right clasp and the connecting part are integrally formed. By selecting the connecting part and the clasp at both ends of the same material to form an integral part, compared with the clasp and the connecting part connected by thread, it can effectively avoid the non-repeatability of the system and the reliability of the system traceability caused by the threaded connection, and improve the accuracy of the entire torque measurement system. In addition, the torque can be measured by cooperating with two non-intrusive torque sensors, which solves the problem of non-detachable and non-interventional shaft system measurement on ships.

Description

Technical Field

[0001] The present application relates to the field of torque testing, and in particular to a non-intrusive torque sensor and a torque measurement structure having the same. Background Art

[0002] The development of new torque sensors and torque measurement have always been the focus of research by many experts and scholars at home and abroad. The ship shaft system is an important part of the ship power plant. It is responsible for transmitting the power generated by the main engine to the propeller, and then transmitting the axial thrust generated by the propeller to the hull to achieve the purpose of pushing the ship to sail. The structure of the ship shaft system is relatively simple, but it plays a very important role and is crucial to ensure the safe navigation of the ship. During the rotation of the ship shaft system, the shaft system will twist under the action of the load. The state of the shaft system mainly includes information such as the torque and shaft power of the shaft system. The ship shaft power is one of the important parameters to characterize the performance status of the hull and the main power plant. By monitoring parameters such as shaft power and taking corresponding maintenance measures in time according to the monitoring information, the power economy and safety of the ship can be effectively improved. Therefore, the measurement of shaft power has become one of the items that must be measured in major shipyards, and the measurement of shaft power and related technologies have always been one of the key technologies developed by various countries. Due to the limited spacing and difficulty in disassembly of the shaft systems on many ships, there is an urgent need for non-invasive on-site torque measurement methods and calibration devices that do not require disconnecting the shaft system.

[0003] The development of non-intrusive torque sensors is to solve the problem of torque measurement of non-detachable and non-interventional shaft systems in ships. However, most of the previous torque sensors were invasive, that is, they had to be used as part of the transmission shaft. This limits its scope of application and is generally limited to laboratory and bench measurements, and is not suitable for industrial field measurements. Summary of the invention

[0004] In view of this, the present application proposes a non-intrusive torque sensor, which is suitable for measuring the torque of shaft structures, including a left snap ring, a right snap ring, a connecting part and a strain gauge; the left snap ring and the right snap ring have the same structure, and are both provided with a groove at the bottom, and the groove matches the shaft to be measured; there is a preset distance between the left snap ring and the right snap ring, and the upper parts are connected by the connecting part; the connecting part is a sheet structure; the strain gauge is bonded to the connection between the connecting part and the left snap ring and / or the right snap ring; and the left snap ring, the right snap ring and the connecting part are integrally formed.

[0005] In a possible implementation, the connecting portion, the left clamping ring, and the right clamping ring are made of elastic metal material.

[0006] In a possible implementation, the preset distance between the left clamping ring and the right clamping ring is [30mm-300mm].

[0007] In a possible implementation, the left snap ring and the right snap ring are both in a straight strip structure, the sheet-shaped connecting portion and the left snap ring are arranged perpendicularly to each other, and the connecting portion and the right snap ring are arranged perpendicularly to each other.

[0008] In a possible implementation, the left snap ring and the right snap ring are arranged parallel to each other, and the upper projection of the connecting portion, the left snap ring and the right snap ring as a whole is in the shape of an “I”.

[0009] In a possible implementation, the groove is an arc-shaped groove, the side projection of the groove is fan-shaped, the central angle of the fan-shaped has a preset angle, and the interval of the preset angle is [135°-180°).

[0010] In a possible implementation, a connecting column is provided on the upper part of the left snap ring, and the connecting column is a square column, and the width of the connecting column is equal to the width of the left snap ring; the two ends of the connecting part are respectively fixed to the connecting column; the groove is opened at the center of the length direction of the left snap ring, and the groove is opened at the center of the length direction of the right snap ring; the connecting column is opened at the center of the length direction of the left snap ring relative to the center of the groove; the two end surfaces of the snap ring in the length direction are arc-shaped surfaces, and the arc-shaped surfaces at both ends of the snap ring are located on the same circular ring.

[0011] In a possible implementation, mounting holes are provided at both ends of the left snap ring in the length direction; mounting holes are provided at both ends of the right snap ring in the length direction; the connection between the connecting portion and the left snap ring is an arc-shaped connection, and the connection between the connecting portion and the right snap ring is an arc-shaped connection.

[0012] On the other hand, the present application also proposes a torque measurement structure, including the non-intrusive torque sensor, sensor fixture and measurement simulation shaft described in any possible implementation method mentioned above; the axis of the measurement simulation shaft is a straight line; the sensor fixture includes the same structure as the non-intrusive torque sensor: a left snap ring, a right snap ring and a connecting part; the left snap ring and the right snap ring have the same structure, and are both provided with a groove at the bottom, and the groove matches the shaft to be measured; there is a preset distance between the left snap ring and the right snap ring, and the upper part is connected by the connecting part; the connecting part is a sheet structure, and the The left retaining ring, the right retaining ring and the connecting portion are integrally formed; a strain gauge is bonded to or is not bonded to the connection between the connecting portion and the left retaining ring and / or the right retaining ring; the non-intrusive torque sensor is fixedly connected to the sensor fixing part, and is respectively fixed to the measurement simulation shaft from the circumferential direction of the measurement simulation shaft, and a gap is reserved between the non-intrusive torque sensor and the sensor fixing part; wherein the groove on the non-intrusive torque sensor matches the measurement simulation shaft, and the groove on the sensor fixing part matches the measurement simulation shaft.

[0013] In a possible implementation, the non-intrusive torque sensor is provided with mounting holes at both ends of the axial direction perpendicular to the measurement simulation shaft; the sensor fixing component is provided with mounting holes at both ends of the axial direction perpendicular to the measurement simulation shaft, and the non-intrusive torque sensor and the sensor fixing component are symmetrically arranged in the circumferential direction of the measurement simulation shaft and are screwed together through the corresponding mounting holes.

[0014] The beneficial effects of the present application are as follows: by selecting the same material for the connecting part and the retaining rings at both ends, they are integrally formed. Compared with the retaining rings and connecting parts connected by threads, the non-repeatability of the system and the reliability of system traceability caused by the threaded connection can be effectively avoided, thereby improving the accuracy of the entire torque measurement system. In addition, the torque can be measured by cooperating with two non-intrusive torque sensors, which solves the problem of non-detachable and non-interventional shaft system measurement on ships. Not only that, the use of a retaining ring-type strain-type torque sensor is a non-intrusive torque sensor. As long as the sensor is clamped on the shaft or installed on the side of the shaft, there is no need to disconnect the shaft system. This brings great convenience to measuring torque parameters in actual working conditions, and can be used to measure torque when shaft breakage is not allowed.

[0015] Other features and aspects of the present application will become apparent from the following detailed description of exemplary embodiments with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments, features, and aspects of the present application and, together with the description, serve to explain the principles of the present application.

[0017] Figure 1 A three-dimensional structural diagram showing a non-intrusive torque sensor according to an embodiment of the present application;

[0018] Figure 2 A front view of a non-intrusive torque sensor according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0019] Various exemplary embodiments, features and aspects of the present application will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0020] Among them, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application or simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0021] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0022] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0023] In addition, in order to better illustrate the present application, numerous specific details are given in the following specific embodiments. It should be understood by those skilled in the art that the present application can also be implemented without certain specific details. In some examples, methods, means, components and circuits well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present application.

[0024] Figure 1 A three-dimensional structural diagram showing a non-intrusive torque sensor according to an embodiment of the present application; Figure 2 A front view of a non-intrusive torque sensor according to an embodiment of the present application is shown.

[0025] like Figure 1-Figure 2 As shown, the non-intrusive torque sensor is suitable for measuring torque, including: a left snap ring 21, a right snap ring 22, a connecting part 10 and a strain gauge 11. The left snap ring 21 and the right snap ring 22 have the same structure, and a groove 24 is provided at the bottom. The groove 24 matches the measurement simulation shaft 30. There is a preset distance between the left snap ring 21 and the right snap ring 22. The upper part is connected by the connecting part 10. The connecting part 10 is a sheet structure. The strain gauge 11 is bonded to the connection between the connecting part 10 and the left snap ring 21 and / or the right snap ring 22, and the left snap ring 21, the right snap ring 22 and the connecting part are integrally formed.

[0026] Furthermore, in one possible embodiment, the connecting portion 10 is in the form of a sheet; the retaining ring 20 is in the form of a straight strip, and there are two retaining rings 20, which are respectively fixed to the two ends of the connecting portion 10 and are parallel to each other. A groove 24 is provided in the middle of one side of the retaining ring 20, and the groove 24 is suitable for matching with the measurement simulation shaft 30; the connecting portion 10 and the retaining ring 20 are made of the same material and are integrally formed, and a strain gauge 11 is bonded and fixed at the connection between the connecting portion 10 and the retaining ring 20.

[0027] In this embodiment, the connecting part 10 and the clamping rings 20 at both ends of the connecting part 10 are made of the same material and are integrally formed. Compared with the clamping ring 20 and the connecting part 10 connected by threads, the non-repeatability and linear hysteresis of the system caused by the threaded connection can be effectively avoided, thereby improving the accuracy of the entire torque measurement system. In addition, the torque can be measured by cooperating with two non-intrusive torque sensors, solving the problem of non-detachable and non-intrusive shaft system measurement on ships.

[0028] Specifically, a 20-type strain-type torque sensor with a clamp ring is used, which is a non-intrusive torque sensor. As long as the sensor is clamped on the shaft or installed on the side of the shaft, there is no need to disconnect the shaft system. This greatly facilitates the measurement of torque parameters under actual working conditions and can be used to measure torque when shaft breakage is not allowed.

[0029] Furthermore, the left retaining ring 21 has a straight strip structure, and a circular arc groove 24 is opened in the middle of one side of the left retaining ring 21, which is suitable for matching with the measurement simulation shaft 30. The right retaining ring 22 has a straight strip structure, which is parallel to and spaced from the right retaining ring 22, and the same circular arc groove 24 is opened in the middle of one side of the right retaining ring 22. One end of the force measuring strain gauge 11 is fixedly connected to the opposite side of the left retaining ring 21 where the circular arc groove 24 is opened, and the other end of the force measuring strain gauge 11 is fixedly connected to the opposite side of the right retaining ring 22 where the circular arc groove 24 is opened. The left retaining ring 21, the force measuring strain gauge 11 and the right retaining ring 22 are integrally formed.

[0030] like Figure 1As shown, in one of the specific embodiments, the top projection of the connecting portion 10 and the clamping rings 20 at both ends is an “I” shape, and the sheet-shaped connecting portion 10 is arranged longitudinally.

[0031] In this embodiment, the plane of the diaphragm-shaped connecting part 10 passes through the axis of the test simulation shaft. The connecting part 10 is a small-range sensor. Since the measured shaft will produce torsional deformation after being twisted, the connecting part 10 arranged longitudinally toward the axis can produce deformation to indirectly measure the torque. The symmetrical "I"-shaped structure is easy to install and fix on the measured shaft, and the two identical non-intrusive torque sensors above and below work together without the need for additional installation tools, which is very convenient and efficient. The symmetrical structure can also ensure the accuracy of traceability.

[0032] In one specific embodiment, the connecting portion 10 and the clamping ring 20 are made of elastic metal material.

[0033] Preferably, the material of the connecting portion 10 and the clamping ring 20 is 40CrNiMoA.

[0034] In one specific embodiment, the groove 24 is an arc-shaped groove 24, and the side projection of the groove 24 is fan-shaped. The central angle of the fan-shaped circle has a preset angle, and the preset angle ranges from [135° to 180°].

[0035] In this embodiment, the groove 24 with an angle less than 180° ensures that the retaining ring 20 does not contact the measurement simulation shaft 30 when it is buckled onto the measurement simulation shaft 30 , that is, the projection of the arc-shaped groove 24 is smaller than a semicircle.

[0036] In one specific embodiment, the distance between the two clamping rings 20 is [30mm-300mm].

[0037] Preferably, the distance between the two clamping rings 20 at both ends of the same sensor is 100 mm. Under the premise of ensuring a reasonable and sufficiently small spacing, the connection part 10 can accurately detect the torque.

[0038] In one specific embodiment, a connecting column 23 is provided on the opposite side of the circular arc groove 24 of the left snap ring 21, and an identical connecting column 23 is provided on the opposite side of the circular arc groove 24 of the right snap ring 22. The left snap ring 21 and the right snap ring 22 have the same structure, the left end of the force measuring strain gauge 11 is fixed to the connecting column 23 at the left end, and the right end of the force measuring strain gauge 11 is fixed to the connecting column 23 at the right end. The force measuring strain gauge 11 is longitudinally arranged perpendicular to the left snap ring 21 and the right snap ring 22.

[0039] In one specific embodiment, the arc-shaped groove 24 is respectively opened at the center position of one side of the left snap ring 21 and the center position of one side of the right snap ring 22 in the length direction.

[0040] In one specific embodiment, the connecting column 23 is a cubic column, and its width is equal to that of the left clamping ring 21 .

[0041] In one specific embodiment, the two end faces of the left snap ring 21 in the length direction are arc-shaped faces, and the two end faces of the right snap ring 22 in the length direction are arc-shaped faces. The connecting columns 23 are respectively arranged at the center position of the length direction of the opposite side of the left snap ring 21 and the center position of the length direction of the opposite side of the right snap ring 22.

[0042] In one specific embodiment, mounting holes are provided at both ends of the left snap ring 21 and the right snap ring 22 in the length direction.

[0043] In this embodiment, the same mounting hole is opened at the same position on the left snap ring 21 and the right snap ring 22, and the mounting hole is used to screw the left snap ring 21 and the right snap ring 22 together, and fix them to the measurement simulation shaft 30 through pre-tightening force so that they can measure the torque of the side shaft.

[0044] like Figure 2 As shown, on the other hand, the present application proposes a torque measurement structure, including two groups of non-intrusive torque sensors in the above-mentioned implementation method and a measuring simulation shaft 30, the measuring simulation shaft 30 is a linear shaft with shoulders at both ends, the arc-shaped grooves 24 on the two groups of non-intrusive torque sensors are matched with the measuring simulation shaft 30, and are respectively fixed on the measuring simulation shaft 30 from the circumference of the measuring simulation shaft 30, and a gap is reserved between the two groups of non-intrusive torque sensors.

[0045] In this embodiment, the non-intrusive torque sensor and the connecting part 10 are integrated into a non-intrusive torque sensor, which is composed of a measuring simulation shaft 30, an upper retaining ring 20, a connecting part 10, and a lower retaining ring 20. The signal is transmitted by wireless transmission, and the display is through a secondary instrument or a host computer.

[0046] The measurement principle of the non-intrusive torque sensor is to use two semicircular chuck structures, and the two semicircles are tightly attached to the working shaft through the huge pre-tightening force of the bolts. Due to the torsion, there must be a relative torsion angle between the two clasps 20. A connection part 10 that senses deformation is fixed between the two clasps 20, and the magnitude of the torque borne by the entire shaft can be measured through the deformation of this sensor. When calibrating this sensor, it is necessary to make a shaft that is exactly the same as the working simulation shaft in terms of size, material, heat treatment method, surface treatment, etc. for simulation, so as to achieve calibration on a torque standard machine.

[0047] The upper and lower retaining rings 20 are fixed to the measurement simulation shaft 30 by the strong pre-tightening force of the bolts. Since the length and external dimensions of the connecting portion 10 between the upper and lower retaining rings 20 are exactly the same, the installation of the retaining rings 20 does not require additional installation tooling, which is very convenient and efficient, while also ensuring the accuracy of traceability.

[0048] Furthermore, the present application also proposes a torque measurement structure, including the non-intrusive torque sensor, the sensor fixture and the measurement simulation shaft 30 described in any of the above embodiments; the axis of the measurement simulation shaft 30 is a straight line; the sensor fixture includes the same structure as the non-intrusive torque sensor: a left snap ring 21, a right snap ring 22 and a connecting portion 10; the left snap ring 21 and the right snap ring 22 have the same structure, and a groove 24 is provided at the bottom, and the groove 24 matches the shaft to be measured; there is a preset distance between the left snap ring 21 and the right snap ring 22, and the upper part is connected by the connecting portion 10; the connecting portion 10 is connected to the left snap ring 21 and the right snap ring 22. The connecting portion 10 is a sheet-like structure, and the left snap ring 21, the right snap ring 22 and the connecting portion 10 are integrally formed; the connection between the connecting portion 10 and the left snap ring 21 and the right snap ring 22 is bonded with a strain gauge 11 or is not bonded with the strain gauge 11; the non-intrusive torque sensor is fixedly connected to the sensor fixing part, and is fixed on the measurement simulation shaft 30 from the circumferential direction of the measurement simulation shaft 30, and a gap is reserved between the non-intrusive torque sensor and the sensor fixing part; wherein, the groove on the non-intrusive torque sensor matches the measurement simulation shaft, and the groove on the sensor fixing part matches the measurement simulation shaft.

[0049] Furthermore, the difference between the sensor fixture and the non-intrusive torque sensor is that the connection part 10 on the sensor fixture can be bonded with a strain gauge 11 at the connection with the left retaining ring 21 and the right retaining ring 22, or the strain gauge 11 can be not bonded. It only serves as a mounting part for fixing the other side of the non-intrusive torque sensor. The preload force generated by the fixation of the two can be fixed to the measurement simulation shaft 30. On the basis of ensuring that the torque measurement can be carried out reasonably, the structure is simpler, redundant and repeated components are eliminated, and the cost of use is reduced.

[0050] Specifically, the specific working process of the torque sensor of the present application is as follows:

[0051] First, based on the principle of strain-type torque sensor and different torque range requirements, the measurement simulation shaft 30 of different diameters is designed. The shaft diameter is designed according to the zero sensitivity of the torque sensor 2mV / V, and the material of the small range 100Nm measurement simulation shaft 30 is selected as aluminum alloy. Then, according to the measurement simulation shaft 30 of different diameters, the matching clamping ring 20 is designed. Next, the range of the connecting part 10 is calculated.

[0052] According to the calculation formula of the torsion angle, take the torque shaft with a measuring range of 1000Nm as an example. M = 1000N.m, the circumferential diameter d = 30mm, the distance between the connecting part 10 and the center of the circular shaft is 25mm, and the calculated Δx is the deformation value Δx≈0.0025mm measured by the connecting part 10. According to the deformation, we set the measuring range of the connecting part 10 to 20N. Since the measurement advantage of the non-intrusive torque sensor is the small pitch measurement, the length of the connecting part 10 is selected as 50mm, and the sensor thickness is selected as 2mm.

[0053] A torque value of the corresponding range is applied to one end of the analog shaft, and the measured shaft produces torsional deformation, and the connecting portion 10 integrally processed with the clamp ring 20 also produces deformation. Due to the integrated design and no threaded connection, the connecting portion 10 can fully and effectively respond to the deformation of the shaft. The mV-level voltage signal output by the force sensor is processed by electrical signal isolation and conditioning technology to simulate the electrical signal and connect to the analog input end of the single-chip microcomputer. The strain signal is converted into a digital signal through the A / D converter of the single-chip microcomputer, and the signal is wirelessly transmitted by the wireless data transmission module group after adaptive digital filtering. After the wireless receiving module receives the signal, it is transmitted to the host computer through the USB port for data processing. In this way, the system can know the size of the torque value according to the voltage change, thereby completing the measurement of the torque of the shaft.

[0054] A 1000Nm torque standard machine was used to perform calibration experiments on the embodiments with a measuring range of 50Nm and 500Nm, a 5000Nm torque standard machine was used to perform calibration experiments on the embodiment with a measuring range of 5000Nm, and a 50kNm torque standard machine was used to perform calibration experiments on the embodiment with a measuring range of 50kNm. Detailed test data are shown in Attached Tables 1.1-1.4;

[0055] Taking the 500Nm embodiment as an example, two measurement simulation shafts 30 with the same size, material, heat treatment method, surface treatment, etc. are processed at the same time. First, the first shaft is marked according to the length of the retaining ring 20 sensor for calibration, and then the retaining ring 20 is reinstalled at the same position on the other shaft for testing. The consistency of the test results of the process indication is compared to complete the traceability test of the 500Nm non-intrusive torque sensor and the non-intrusive torque sensor with an integrated design of the connecting part 10. See Appendix 1.5 for detailed test data;

[0056] It can be seen from the test data that the non-intrusive torque sensor with an integrated design of the non-intrusive torque sensor and the connecting part 10 is easy and efficient to install, the measurement data is accurate and reliable, the traceability performance is good, and it is suitable for small-pitch non-intrusive measurement. It can solve the torque measurement of non-detachable and non-interventional shaft systems in ships, as well as the problem of on-site system calibration of non-detachable and non-interventional torque sensors or dynamometers in the scientific research and production of national high-tech projects and key models.

[0057] In one specific embodiment, the non-intrusive torque sensor is provided with mounting holes at both ends of the axial direction perpendicular to the measurement simulation shaft 30, and two groups of non-intrusive torque sensors are symmetrically arranged around the measurement simulation shaft 30 and connected by bolts through the mounting holes.

[0058] The non-intrusive torque sensor and the connecting part 10 are integrated into one. The non-intrusive torque sensor is composed of a measuring simulation shaft 30, an upper retaining ring 20, a connecting part 10, and a lower retaining ring 20. The signal is transmitted by wireless transmission, and the display is displayed by a secondary instrument or a host computer.

[0059] The measurement principle of the non-intrusive torque sensor is to use two semicircular chuck structures, and the two semicircles are tightly attached to the working shaft through the huge pre-tightening force of the bolts. Due to the torsion, there must be a relative torsion angle between the two clasps 20. A connection part 10 that senses deformation is fixed between the two clasps 20, and the magnitude of the torque borne by the entire shaft can be measured through the deformation of this sensor. When calibrating this sensor, it is necessary to make a shaft that is exactly the same as the working simulation shaft in terms of size, material, heat treatment method, surface treatment, etc. for simulation, so as to achieve calibration on a torque standard machine.

[0060] The design of the analog shaft is based on the design principle of the strain-type torque sensor. The diameter of the analog shaft is designed according to the range of torque measurement. The material of the analog shaft is 40CrNiMoA, a commonly used elastic steel material for making strain-type sensors. The diameter of the shaft is designed based on the zero sensitivity of the corresponding range torque sensor of 1mV / V. In order to increase the accuracy of measurement and the processing of the retaining ring 20 and the installation of the system, the material used for the small-range analog output shaft is aluminum alloy LY12CZ. This can increase the diameter of the analog output shaft and reduce the difficulty of system installation.

[0061] During the entire torque measurement process, the connection method between the retaining ring 20 and the connecting part 10 is particularly important. In the previous design, the retaining ring 20 and the connecting part 10 are connected by threads. Due to the gap in the threads, the repeatability of the measurement results is very poor. The present invention adopts a non-intrusive torque sensor and the connecting part 10 for integrated processing. Although it increases the difficulty of processing, it improves the repeatability, linearity, hysteresis and other indicators of the entire measurement system, and improves the measurement accuracy of the entire system.

[0062] Schedule 1.1

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[0064] Schedule 1.2

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[0067] Schedule 1.3

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[0070] Schedule 1.4

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[0073] Schedule 1.5

[0074]

[0075] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A non-intrusive torque sensor, suitable for measuring the torque of a shaft structure, characterized in that: It includes a left clamping ring, a right clamping ring, a connecting part and a strain gauge; The left clamping ring and the right clamping ring have the same structure, and both have a groove at the bottom, and the groove matches the shaft to be measured; There is a preset distance between the left snap ring and the right snap ring, and the upper parts are connected by the connecting part; The connecting portion is in a sheet-like structure; The strain gauge is bonded to the connection between the connecting portion and the left snap ring and / or the right snap ring; and the left snap ring, the right snap ring and the connecting portion are integrally formed; The connecting portion, the left clamping ring and the right clamping ring are made of elastic metal material; The left snap ring and the right snap ring are both in a straight strip structure, the sheet-shaped connecting portion and the left snap ring are arranged perpendicularly to each other, and the connecting portion and the right snap ring are arranged perpendicularly to each other; The left snap ring and the right snap ring are arranged parallel to each other, and the upper projection of the connecting portion, the left snap ring and the right snap ring as a whole is in the shape of an "I"; The connecting part is a small-range sensor; A connecting column is provided on the upper part of the left clamping ring, the connecting column is a square column, and the width of the connecting column is equal to the width of the left clamping ring; Both ends of the connecting portion are respectively fixed to the connecting column; The groove is formed at the center of the left snap ring in the length direction, and the groove is formed at the center of the right snap ring in the length direction; The connecting column is arranged at the center of the groove in the length direction of the left snap ring; The two end surfaces of the clamping ring in the length direction are arc-shaped surfaces, and the arc-shaped surfaces at the two ends of the clamping ring are located on the same circular ring.

2. The non-intrusive torque sensor according to claim 1, characterized in that: And the preset distance between the left clamping ring and the right clamping ring is [30mm-300mm].

3. The non-intrusive torque sensor according to claim 1, characterized in that: The groove is an arc-shaped groove, and the side projection of the groove is fan-shaped. The central angle of the fan-shaped circle has a preset angle, and the interval of the preset angle is [135°-180°).

4. The non-intrusive torque sensor according to any one of claims 1 to 3, characterized in that: Mounting holes are provided at both ends of the left snap ring in the length direction; The two ends of the right clamping ring in the length direction are provided with mounting holes; The connection between the connecting portion and the left snap ring is an arc-shaped connection, and the connection between the connecting portion and the right snap ring is an arc-shaped connection.

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