Torque sensor verification tool
By designing a torque sensor calibration fixture, and utilizing a combination of a fixed block, coupling, and balance bar, a simple and efficient calibration of the torque sensor was achieved. This solved the problems of expensive and complex operation of traditional calibration equipment, and improved the accuracy and reliability of the calibration.
Patent Information
- Application Number
- CN202520069353.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-10
- Publication Date
- 2025-12-30
- Estimated Expiration
- 2035-01-10
AI Technical Summary
There is a lack of efficient and convenient methods for calibrating existing torque sensors. Traditional calibration equipment is expensive and complicated to operate, making it difficult for ordinary companies to perform frequent calibrations, which leads to a decline in product quality and misleading research and development.
A torque sensor calibration fixture was designed. By combining a fixed block with a coupling, a fixed sleeve, and a balance bar, the sensor data is compared using the torque calculation formula, thus achieving a simple calibration process.
This paper presents a simple and easy-to-operate calibration method that can efficiently and accurately calibrate torque sensors in ordinary enterprises, improve the accuracy and reliability of calibration, and reduce the dependence on professional equipment and personnel.
Smart Images
Figure CN223741833U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of torque verification technology, and in particular to a torque sensor verification fixture. Background Technology
[0002] Torque sensors have a wide range of applications, including the precise measurement of torque in rotating components in industries such as machinery, automotive, and aerospace. For example, in automotive engine development and precision machining, the accuracy of torque measurement is crucial to product performance and quality; deviations can lead to problems such as unstable power and workpiece scrap.
[0003] Currently, torque sensors are mostly purchased externally. Their production, transportation, and use are affected by many factors, which can easily lead to deviations in accuracy, potentially causing a decline in product quality and misleading research and development.
[0004] Unfortunately, there is a lack of efficient and universal calibration methods for purchased torque sensors. Traditional calibration relies on expensive equipment in specialized laboratories, is cumbersome, time-consuming, and labor-intensive, requires professional personnel, and is difficult for ordinary companies to perform frequently, making timely error correction impossible and hindering industry progress. Therefore, there is an urgent need to develop a calibration fixture specifically for torque sensors to fill this gap and provide a more convenient and accurate calibration solution. Utility Model Content
[0005] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a torque sensor calibration fixture, which aims to fix the driving end of the torque sensor with a fixing block, and then connect the load end of the torque sensor to the fixing sleeve through a coupling. The object is suspended on the balance bar on the fixing sleeve, and the torque calculated by the torque calculation formula is compared with the data displayed by the torque sensor to determine whether the torque sensor is distorted.
[0006] To achieve the above objectives, the present invention adopts the following technical solution:
[0007] A torque sensor calibration fixture includes a fixing block for fixing to the drive end of the torque sensor, a coupling for fixing to the load end of the torque sensor, a fixing sleeve for fixing to the coupling, and a balance bar; the fixing sleeve is provided with a through hole aligned with the extension direction of the balance bar, and the balance bar is located in the through hole; the fixing sleeve is provided with a first fastener for fixing the balance bar in the through hole; either end of the balance bar is used to suspend an object.
[0008] The torque sensor calibration fixture is provided in which hanging grooves are provided at both ends of the balance bar.
[0009] The torque sensor calibration fixture includes a first fastener that is a threaded rod, a first threaded hole on the side wall of the fixing sleeve away from the torque sensor, the first threaded hole communicating with the through hole, the rod body of the first locking rod being threadedly connected to the first threaded hole, and the end of the rod body of the first locking rod being used to press against the side wall of the balance bar.
[0010] The torque sensor calibration fixture includes two first locking rods and two first threaded holes, with the first locking rods threadedly connected to the corresponding first threaded holes.
[0011] The torque sensor calibration fixture includes a fixed sleeve that is a cloverleaf sleeve with circumferentially arranged insertion holes. The coupling has multiple protrusions on its sidewall away from the torque sensor, the number of which corresponds to the number of insertion holes. Each protrusion corresponds to one insertion hole, and each protrusion is located within its corresponding insertion hole. The cloverleaf sleeve also has a second fastener for fixing the protrusions into the insertion holes.
[0012] The torque sensor calibration fixture, wherein the second fastener is a second locking rod with a threaded rod body, a second threaded hole is provided on the side wall of the circumference of the plum blossom sleeve, the second threaded hole communicates with the inner cavity of any of the insertion holes, the rod body of the second locking rod is threadedly connected to the second threaded hole, and the end of the rod body of the second locking rod is used to press against the arcuate side wall of the protrusion located in the insertion hole.
[0013] The torque sensor calibration fixture includes a slot on the fixing block, and a protrusion extending along the length of the fixing block in the slot. The protrusion is connected to the torque sensor by a key connection.
[0014] Beneficial effects:
[0015] This invention provides a torque sensor calibration fixture. A fixing block secures the drive end of the torque sensor, and a coupling connects the load end of the torque sensor to a fixed sleeve. A balance bar is fixed to the fixed sleeve, and the object is suspended from the balance bar. The torque calculated using the torque calculation formula is compared with the data displayed by the torque sensor to determine if the torque sensor is distorted. This calibration fixture has a simple structure and does not require expensive calibration equipment or professional personnel, making it easy to promote and apply. Attached Figure Description
[0016] Figure 1 Schematic diagram of the torque sensor calibration fixture provided by this utility model Figure 1 .
[0017] Figure 2Schematic diagram of the torque sensor calibration fixture Figure 2 .
[0018] Explanation of main component symbols: 1-fixed block, 11-slot, 12-protrusion, 2-coupling, 21-protrusion, 3-fixed sleeve, 31-through hole, 32-first threaded hole, 33-insertion hole, 34-second threaded hole, 4-balance bar, 41-hanging groove, 5-first fastener, 6-second fastener; 10-torque sensor. Detailed Implementation
[0019] This utility model provides a torque sensor calibration fixture. To make the purpose, technical solution, and effects of this utility model clearer and more explicit, the following describes this utility model in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit the scope of protection of this utility model.
[0020] Please see Figures 1-2 This utility model provides a torque sensor calibration fixture, including a fixing block 1 for fixing to the drive end of a torque sensor 10, a coupling 2 for fixing to the load end of the torque sensor 10, a fixing sleeve 3 for fixing to the coupling 2, and a balance bar 4; the fixing sleeve 3 is provided with a through hole 31 consistent with the extension direction of the balance bar 4, and the balance bar 4 is located in the through hole 31; the fixing sleeve 3 is provided with a first fastener 5 for fixing the balance bar 4 in the through hole 31; any end of the balance bar 4 is used to suspend an object.
[0021] In practical applications, the torque sensor 10 is placed on a flat surface, and its drive end is connected to the fixed block 1 to fix it. Next, a coupling 2, a fixed sleeve 3, and a balance bar 4 are installed on the load end of the torque sensor 10, and the balance bar 4 is positioned on the fixed sleeve 3 using the first fastener 5. An object (equivalent to a weight) is suspended from one end of the balance bar 4, and the distance from the center of the fixed sleeve 3 to the suspended object is measured. The torque formula is used: Newton-meter (N·m) = force × lever arm, where force is in Newtons (N) and the lever arm length is in meters (m). 1 N·m equals 0.101972 kgf·m or 9.80665 N·m. The data displayed on the torque sensor 10's display is compared with the Newton-meter data of the lever arm of the suspended object. If the two data are equal, it indicates that the torque sensor 10 is not distorted.
[0022] In some embodiments, both ends of the balance bar 4 are provided with hanging slots 41. The hanging slots 41 facilitate the hanging of items; for example, a weight of known mass can be hung there. The weight's gravity generates a precise force, and combined with the known lever arm length (i.e., the distance from the rotating shaft (center of the fixed sleeve 3) to the suspension point at the hanging slot 41), the torque can be calculated using the formula "Newton-meter = force × lever arm length," conveniently and accurately providing a standard torque value for the torque sensor 10 during calibration, achieving high-precision calibration and effectively improving the accuracy and reliability of the calibration. The hanging slots 41 at both ends of the balance bar 4 allow operators to suspend objects at either end of the balance bar 4, improving operational convenience.
[0023] In some embodiments, the first fastener 5 is a first locking rod with threads on its body. A first threaded hole 32 is provided on the side wall of the fixing sleeve 3 away from the torque sensor 10. The first threaded hole 32 communicates with the through hole 31. The rod body of the first locking rod is threadedly connected to the first threaded hole 32, and the end of the rod body is used to press against the side wall of the balance bar 4. After the balance bar 4 is passed through the through hole 31 of the fixing sleeve 3, the rod body of the first locking rod is screwed into the first threaded hole 32. By using the rod body of the first locking rod to press against the balance bar 4, the balance bar 4 can be fixed to the fixing sleeve 3. The above structure is simple in construction and easy to operate, making both use and disassembly very convenient.
[0024] Furthermore, there are two first locking rods and two first threaded holes 32, with each first locking rod threaded into its corresponding first threaded hole 32. When an object is suspended from the balance bar 4, the weight increases. The two first locking rods provide two-point fixation, increasing the friction between the first locking rods and the sidewall of the balance bar 4, thus preventing displacement of the balance bar 4.
[0025] In some embodiments, the fixing sleeve 3 is a cloverleaf sleeve with a circular array of insertion holes 33. The side wall of the coupling 2 away from the torque sensor 10 has multiple protrusions 21, the same number as the insertion holes 33, with each protrusion 21 corresponding to a specific insertion hole 33 and located within that hole. The cloverleaf sleeve also has a second fastener 6 for fixing the protrusions 21 into the insertion holes 33. In use, after installing the coupling 2 onto the load end of the torque sensor 10, the insertion holes 33 on the cloverleaf sleeve are aligned with the protrusions 21 on the coupling 2, and then the second fastener 6 is used to fix the cloverleaf sleeve onto the coupling 2. The assembly and disassembly processes are convenient.
[0026] In some embodiments, the second fastener 6 is a second locking rod with threads on its body. A second threaded hole 34 is provided on the side wall of the circumference of the spline sleeve. The second threaded hole 34 communicates with the inner cavity of any of the insertion holes 33. The rod body of the second locking rod is threadedly connected to the second threaded hole 34, and the end of the rod body is used to press against the arcuate side wall of the protrusion 21 located in the insertion hole 33. Similarly, by screwing the second locking rod into the second threaded hole 34, the rod body of the second locking rod presses against the protrusion 21, thus fixing the spline sleeve to the coupling 2.
[0027] In some embodiments, the fixing block 1 has a slot 11, and a protrusion 12 extending along the length of the fixing block 1 is provided in the slot 11. The protrusion 12 is connected to the torque sensor 10 by a key connection. The cooperation between the slot 11 and the protrusion 12 provides precise positioning guidance for the torque sensor. During installation, the sensor can quickly and accurately slide into the predetermined position along the protrusion 12, avoiding measurement errors caused by installation position deviations, ensuring the coaxiality of the sensor and the calibration fixture, thereby ensuring the accuracy of the calibration and making subsequent calibration data more reliable. The key connection method has high connection reliability and stability of torque transmission. Compared with some ordinary connection methods, the key can withstand greater shear force. During torque transmission, it effectively prevents relative sliding between the sensor and the fixing block 1, ensuring that the torque value transmitted from the fixing block 1 to the sensor is stable and accurate, laying a solid foundation for high-precision calibration. In addition, this structural design facilitates installation and disassembly. When it is necessary to replace different models of torque sensors 10, the operator only needs to move the old sensor out along the direction of the convex strip 12, then slide the new sensor into the convex strip 12 and fix it with the key. The operation is simple and quick, which greatly shortens the time for replacing sensors and improves the efficiency of the calibration tooling.
[0028] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0029] Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.
[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for mutual communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0031] It is understood that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of this utility model, and all such substitutions or changes should fall within the protection scope of this utility model.
Claims
1. A torque sensor verification fixture, characterized by, The torque sensor comprises a fixed block for being fixed with a driving end of the torque sensor, a coupling for being fixed with a load end of the torque sensor, a fixed sleeve fixed with the coupling, and a balance bar; the fixed sleeve is provided with a through hole consistent with an extending direction of the balance bar, and the balance bar is located in the through hole; the fixed sleeve is provided with a first fastener for fixing the balance bar in the through hole; either end of the balance bar is used for hanging an object.
2. The torque sensor verification fixture of claim 1, wherein, Both ends of the balance bar are provided with a hanging groove.
3. The torque sensor verification fixture of claim 1, wherein, The first fastener is a first locking rod with a threaded rod body, the fixed sleeve is provided with a first threaded hole on a side wall away from the torque sensor, the first threaded hole is in communication with the through hole, the rod body of the first locking rod is in threaded connection with the first threaded hole, and an end of the rod body of the first locking rod is used for tightly pressing a side wall of the balance bar.
4. The torque sensor verification fixture of claim 3, wherein, The first locking rod is two, the first threaded hole is two, and the first locking rod is in threaded connection with the corresponding first threaded hole.
5. The torque sensor verification fixture of claim 1, wherein, The fixed sleeve is a plum blossom sleeve, the plum blossom sleeve is provided with a plurality of insertion holes arranged in a circumferential array, the coupling is provided with a plurality of protrusions consistent with the number of the insertion holes on a side wall away from the torque sensor, the protrusions correspond to the insertion holes one by one, and the protrusions are located in the corresponding insertion holes; the plum blossom sleeve is further provided with a second fastener for fixing the protrusions in the insertion holes.
6. The torque sensor verification fixture of claim 5, wherein, The second fastener is a second locking rod with a threaded rod body, the plum blossom sleeve is provided with a second threaded hole on a circumferential side wall, the second threaded hole is in communication with an inner cavity of any insertion hole, the rod body of the second locking rod is in threaded connection with the second threaded hole, and an end of the rod body of the second locking rod is used for tightly pressing a circular arc side wall of the protrusion located in the insertion hole.
7. The torque sensor verification fixture of claim 1, wherein, The fixed block is provided with a slot hole, the slot hole is provided with a protruding strip extending along a length direction of the fixed block, and the protruding strip is connected to the torque sensor in a key connection mode.