High-precision anti-bias load ring force sensor

Abstract

The utility model discloses a high accuracy anti partial load annular force sensor mainly for big force value measurement in the industrial field. The sensor adopts the annular elastomer structure of integrated molding, and its core innovation lies in the asymmetric strain beam and blind hole design and the optimized strain gauge patch and group bridge technology. The annular elastomer center is the force hole, and the upper and lower end faces are the bearing surface. On the inner wall of annular elastomer, at least two symmetric distribution narrow strain beams are formed through precision machining, and the blind hole is processed on the back of strain beam (i. e. the non-direct force side), thereby accurately guiding stress concentration, and the sensitivity of sensor is significantly improved. The strain gauge is pasted to the specific area of strain beam at specific angle, and constitutes full bridge circuit, can effectively compensate temperature drift, and automatically inhibits the interference of non-target load (partial load) such as bending moment and torque, thereby ensuring that high accuracy, high stability tension / pressure signal can still be output under complex working conditions.

Description

Technical Field

[0001] This utility model relates to the field of force measurement technology, and in particular to a high-precision anti-eccentric load ring force sensor. Specifically, it relates to a high-precision, high-reliability ring force sensor for industrial applications, which is particularly suitable for applications such as crane safety monitoring, industrial robot end effectors, large testing machines, and material handling systems that require the measurement of large forces and are subject to complex working conditions. Background Technology

[0002] Ring force sensors are widely used in various industrial force measurement applications due to their robust structure, large measuring range, and ease of installation. Traditional ring sensors (such as "doughnut" type sensors) typically employ a simple ring structure, with strain gauges directly bonded to the inner or outer wall of the ring. However, this structure has the following inherent drawbacks: Low sensitivity: The uniform ring structure results in a relatively dispersed stress distribution under stress, leading to a small strain and a weak output signal with a low signal-to-noise ratio. This is a fatal weakness for applications requiring high-precision measurements.

[0003] Poor resistance to eccentric loading: In practical industrial applications, it is difficult to apply loads absolutely along the central axis. Any small eccentric moment (bending moment) or lateral force (torque) will cause significant measurement errors, resulting in unstable and unreliable readings. For example, eccentric loading is unavoidable when a crane swings while lifting heavy objects or when an industrial robot performs complex movements.

[0004] Manufacturing consistency is difficult to guarantee: Due to the lack of precise stress concentration design, the bonding position of strain gauges has a great impact on sensor performance, and the consistency between different sensors is poor, which brings difficulties to mass production and calibration.

[0005] In existing technologies, although some attempts have been made to improve sensitivity by slotting the outer ring, these often sacrifice the overall structural strength and overload resistance, and have limited effectiveness in offset load compensation. For example, some designs improve sensitivity by increasing the complexity of the ring-shaped elastomer structure, but this may introduce unwanted stress concentration points, affecting the sensor's durability and overload protection capabilities.

[0006] Therefore, there is an urgent need in the field for a ring force sensor that can significantly improve sensitivity, has excellent resistance to off-center loading, and maintains high structural strength and good manufacturing consistency. Utility Model Content

[0007] To address the shortcomings of existing technologies, the purpose of this invention is to provide a high-precision anti-off-center load ring force sensor, which is an industrial ring force sensor with high sensitivity, strong anti-off-center load capability, good linearity, and high long-term stability. Specifically, this invention aims to achieve precise guidance and control of the stress field through an integrated structural innovation design, while ensuring the structural strength and overload capacity of the sensor, thereby simultaneously achieving high sensitivity and excellent anti-off-center load performance.

[0008] The above-mentioned utility model objective is achieved through the following technical solution: This utility model provides a high-precision anti-eccentric load ring force sensor, including an integrally formed ring elastic body. The ring elastic body has a force-bearing hole at its center, and the upper and lower end faces are respectively the first force-bearing surface and the second force-bearing surface. At least two strain beams are provided on the inner wall of the ring elastic body and are symmetrically distributed in the circumferential direction. Blind holes are provided at the corresponding positions on the outer wall of the ring elastic body where the strain beams are located. At least one strain gauge is attached to each strain beam, and all strain gauges are connected to form a Wheatstone bridge circuit.

[0009] According to one embodiment of the present invention, the cross-section of the strain beam is rectangular, and its width is less than half the perimeter of the inner wall of the annular elastic body divided by the number of strain beams.

[0010] According to one embodiment of the present invention, the shape of the blind hole is cylindrical, square groove or hemispherical. The present invention also provides a method in which the depth is less than the radial thickness of the annular elastomer.

[0011] According to one embodiment of the present invention, each strain beam is attached with four strain gauges, including two first strain gauges (R1, R3) for sensing tensile strain and two second strain gauges (R2, R4) for sensing compressive strain; the sensing grid direction of the first strain gauges (R1, R3) is parallel to the axial direction of the annular elastic body and is attached to the inner surface of the strain beam; the sensing grid direction of the second strain gauges (R2, R4) is parallel to the axial direction of the annular elastic body and is attached to the outer surface of the strain beam, and their attachment position is directly opposite the bottom area of ​​the blind hole.

[0012] According to one embodiment of the present invention, four strain gauges (R1, R2, R3, R4) are connected to form a Wheatstone full-bridge circuit, wherein the strain gauges on opposite bridge arms sense strain of the same nature.

[0013] According to one embodiment of the present invention, the sidewall of the annular elastomer is further provided with a cable interface and a wiring chamber for wiring and installation.

[0014] According to one embodiment of the present invention, the material of the annular elastomer is high-strength alloy steel, stainless steel, or precipitation-hardening stainless steel.

[0015] According to one embodiment of the present invention, multiple mounting threaded holes are machined on both the first bearing surface and the second bearing surface for connecting and fixing with external equipment by bolts.

[0016] According to one embodiment of the present invention, the number of strain beams is two or four, which are uniformly and symmetrically distributed along the circumference of the annular elastic body.

[0017] According to one embodiment of the present invention, the strain gauge is a metal foil strain gauge, which is attached to the strain beam using a high-temperature curing adhesive.

[0018] In summary, compared with the prior art, the present invention has at least one of the following beneficial technical effects: High sensitivity: The synergistic design of the narrow strain beam and the blind hole at the back enables efficient stress concentration, multiplying the strain in the sensitive area and significantly improving the sensor's output signal voltage and signal-to-noise ratio. This allows the sensor to detect minute force changes or achieve higher resolution using the same electronic amplification circuitry.

[0019] Exceptional resistance to off-center loading: The unique strain gauge arrangement and full-bridge circuit design ensure that when the sensor is subjected to non-axial forces (such as bending moment or torque), the resistance changes generated by each strain gauge cancel each other out within the bridge, resulting in virtually unaffected output signals. This significantly improves the accuracy and reliability of measurements under complex and unstable conditions.

[0020] High structural strength and overload capacity: The blind hole design, rather than the through hole design, preserves the overall structure of the ring elastomer, making it less prone to permanent deformation or structural damage when subjected to severe impact or accidental large overload, thus extending the service life of the sensor.

[0021] Excellent linearity and repeatability: The precisely designed stress concentration zone ensures a highly linear relationship between strain and applied load. Simultaneously, this design reduces the sensitivity of strain gauge placement to performance, resulting in good manufacturing consistency, facilitating mass production, and ensuring high product performance consistency.

[0022] Effective temperature compensation: The full-bridge circuit design can automatically compensate for the change in strain gauge resistance caused by changes in ambient temperature, reduce the impact of temperature drift on the measurement results, and improve the temperature stability and long-term stability of the sensor.

[0023] Easy to install and integrate: The standard ring structure and mounting threaded hole design make it easy to integrate into various industrial equipment, such as force sensing units for robot joints or force monitoring units for crane hooks. It is easy to install and has wide applicability. Attached Figure Description

[0024] Figure 1 This is the front view of the present invention.

[0025] Figure 2 This is a top view of the present invention.

[0026] Reference numerals: 1. Annular elastic body; 11. Force-bearing hole; 12. First load-bearing surface; 13. Second load-bearing surface; 14. Mounting threaded hole; 2. Strain beam; 3. Blind hole; 4. Strain gauge; 5. Cable interface; 6. Wiring chamber. Detailed Implementation

[0027] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0028] In the description of this application, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," 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 application and simplifying the description, and do not 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 application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0030] Example 1: Reference Figure 1 and Figure 2This utility model discloses a high-precision anti-eccentric load ring force sensor, including an integrally formed ring elastic body 1. The ring elastic body 1 has a force-bearing hole 11 at its center, and the upper and lower end faces are respectively the first force-bearing surface 12 and the second force-bearing surface 13. At least two strain beams 2 are provided on the inner wall of the ring elastic body 1, which are symmetrically distributed along the circumference. Blind holes 3 are provided at the corresponding positions on the outer wall of the ring elastic body 1 where the strain beams 2 are located. At least one strain gauge 4 is attached to each strain beam 2, and all strain gauges 4 are connected together to form a Wheatstone bridge circuit.

[0031] The cross-section of the strain beam 2 is rectangular, and its width is less than half the perimeter of the inner wall of the annular elastic body 1 divided by the number of strain beams 2, to ensure sufficient stress concentration. There are two or four strain beams 2, evenly and symmetrically distributed along the circumference of the annular elastic body 1. Multiple threaded holes 14 are machined on both the first bearing surface 12 and the second bearing surface 13 for connection and fixation with external equipment via bolts, enabling convenient integration with external equipment. The blind hole 3 is cylindrical, square, or hemispherical in shape; this invention also provides one with a depth less than the radial thickness of the annular elastic body 1.

[0032] Each strain beam 2 has four strain gauges 4 attached, including two first strain gauges (R1, R3) for sensing tensile strain and two second strain gauges (R2, R4) for sensing compressive strain. The sensing grid direction of the first strain gauges (R1, R3) is parallel to the axial direction of the annular elastic body 1 and is attached to the inner surface of the strain beam 2. The sensing grid direction of the second strain gauges (R2, R4) is parallel to the axial direction of the annular elastic body 1 and is attached to the outer surface of the strain beam 2, and their attachment position is directly opposite the bottom area of ​​the blind hole 3.

[0033] Four strain gauges 4 (R1, R2, R3, R4) are connected to form a Wheatstone full-bridge circuit, where strain gauges 4 on opposite bridge arms sense strain of the same nature. The strain gauges 4 are foil strain gauges, attached to the strain beam 2 using a high-temperature curing adhesive. The sidewall of the annular elastomer 1 is also provided with a cable interface 5 for wiring and installation connections, and a wiring chamber 6, to protect internal wires and lead out sensor signal cables. The material of the annular elastomer 1 is high-strength alloy steel, stainless steel, or precipitation-hardening stainless steel. In this embodiment, the annular elastomer 1 is preferably made of a material with high strength and good elasticity, such as 17-4PH precipitation-hardening stainless steel, high-strength alloy steel, or other stainless steel, to ensure the long-term stability and overload capacity of the sensor.

[0034] The core of this utility model is an integrally molded annular elastic body 1. The annular elastic body 1 has a force-bearing hole 11 at its center, and its upper and lower end faces are a first force-bearing surface 12 and a second force-bearing surface 13, respectively. The key improvement of this utility model lies in the synergistic design of the following two aspects: The strain beam 2 and blind hole 3 structure: At least two narrow strain beams 2, symmetrically distributed circumferentially, are precisely machined on the inner wall of the annular elastic body 1. Preferably, the number of strain beams 2 is two or four. Simultaneously, a blind hole 3 is machined on the outer wall of the annular elastic body 1 corresponding to each strain beam 2. This blind hole 3 does not penetrate the annular elastic body 1, and its shape can be cylindrical, square-grooved, or hemispherical. Its depth is optimized through finite element analysis to ensure it is less than the radial thickness of the annular elastic body 1. The function of this "strain beam 2-blind hole 3" structure is to break the structural symmetry of the annular elastic body 1, creating a precisely controllable stress concentration zone at the root region of the strain beams 2. When the sensor is subjected to axial load, the force flow will be forcibly guided through these narrow strain beams 2, causing this region to generate a much larger bending strain than a traditional homogeneous annular structure, thereby significantly improving sensitivity.

[0035] Optimized strain gauge 4 mounting and bridging technology: Four strain gauges 4 are mounted on each strain beam 2 in a specific manner. Specifically, the two first strain gauges (R1, R3) are mounted on the inner surface of the strain beam 2 (i.e., the side closest to the stress hole 11) with their sensing grids parallel to the axis of the annular elastomer 1, primarily sensing tensile strain. The other two second strain gauges (R2, R4) are also mounted on the outer surface of the strain beam 2 with their sensing grids also parallel to the axis, and their centers are precisely aligned with the bottom area of ​​the blind hole 3, primarily sensing compressive strain. These four strain gauges 4 (R1, R2, R3, R4) are connected to form a Wheatstone bridge circuit. The circuit connection principle is to ensure that the strain gauges 4 on opposite bridge arms sense strains of the same nature. This ingenious arrangement allows the signal generated by the target load (axial tension / compression) to be superimposed and amplified (high sensitivity), while spurious strains caused by non-target loads such as bending moment, torque, or temperature changes are automatically canceled out within the bridge (excellent resistance to off-center loading and temperature compensation).

[0036] This embodiment provides a high-precision anti-eccentric load ring force sensor, which is a double strain beam 2 structure sensor. Its ring elastic body 1 is made of 17-4PH precipitation hardening stainless steel through integral turning, milling and drilling. After solution treatment and aging treatment, the 17-4PH material has a yield strength of over 1000MPa and excellent elastic properties, which can ensure the linear response and long-term stability of the sensor under a large range.

[0037] The annular elastomer 1 has a through cylindrical force-bearing hole 11 at its center, with the upper end face being the first bearing surface 12 and the lower end face being the second bearing surface 13. Eight M8 mounting threaded holes 14 are uniformly machined circumferentially on both bearing surfaces for secure connection to the upper and lower connecting plates or equipment flanges via high-strength bolts.

[0038] Two narrow, elongated rectangular strain beams 2 are symmetrically machined on the inner wall of the annular elastomer 1 using precision milling. These two strain beams 2 are symmetrically distributed about the central axis of the annular elastomer 1 at 180 degrees. The width of the strain beams 2 is calculated and optimized, for example, to be 15 mm, much smaller than half the circumference of the inner wall (e.g., 150 mm) (i.e., 75 mm), thus concentrating the stress in this area. At the outer wall position directly opposite each strain beam 2, a cylindrical blind hole 3 is machined. The diameter and depth of the blind hole 3 are optimized using finite element analysis (FEA), for example, a depth of 10 mm (less than the radial thickness of the annular elastomer 1, 25 mm), to ensure maximum and uniform bending stress at the root region of the strain beams 2, while never penetrating the annular elastomer 1, thus guaranteeing the overall strength and overload resistance of the structure.

[0039] Four metal foil strain gauges 4 are precisely adhered to each strain beam 2 using high-precision positioning fixtures and high-temperature curing adhesive. The metal foil strain gauges 4 have advantages such as good stability and low creep. The sensing grid directions of strain gauges 4R1 and R3 are strictly parallel to the axis of the annular elastic body 1 (i.e., the direction of force) and are adhered to the inner surface of the strain beam 2 (the side facing the force-bearing hole 11). The sensing grid directions of strain gauges 4R2 and R4 are also parallel to the axis, but are adhered to the outer surface of the strain beam 2 (the side facing away from the force-bearing hole 11), and their center positions are precisely aligned with the bottom center region of the blind hole 3 using microscope-aided positioning to sense the maximum compressive strain in that region.

[0040] The four strain gauges 4 (R1, R2, R3, R4) are connected to form a Wheatstone bridge circuit. Specifically, R1 and R2 on the same strain beam 2 are connected in series to form one arm of the bridge; the corresponding R3 and R4 on another strain beam 2 are connected in series to form the opposite arm. Simultaneously, R1 and R3 on two strain beams 2 are connected in series to form the other arm; R2 and R4 on two strain beams 2 are connected in series to form their adjacent arm. The excitation voltage (Vexc, e.g., 10V DC) of the bridge is applied between the R1-R2 node and the R3-R4 node, and the output signal (Vout) is taken from between the R1-R3 node and the R2-R4 node.

[0041] The working principle is as follows: Axial tension condition: When the sensor is subjected to axial tension, both strain beams 2 bend inward (towards the central axis). At this time, R1 and R3 on the inner side of each strain beam 2 are stretched, and the resistance increases; R2 and R4 on the outer side are compressed, and the resistance decreases. In the full-bridge circuit, the resistance change trend of the bridge arm containing the two series-connected R1 (increasing) and R2 (decreasing) and the bridge arm containing the two series-connected R3 (increasing) and R4 (decreasing) on ​​the opposite arm causes the bridge to generate a significant positive differential output voltage (Vout>0), and this voltage is proportional to the magnitude of the tension.

[0042] Axial pressure condition: When the sensor is subjected to axial pressure, the situation is reversed. Strain beam 2 bends outward, compressing the inner R1 and R3, reducing their resistance; while the outer R2 and R4 are stretched, increasing their resistance. This results in the bridge outputting a negative voltage signal (Vout < 0) that is proportional to the magnitude of the pressure.

[0043] Off-center load (bending moment) condition: When the sensor is subjected to a bending moment (off-center load), such as a lateral force perpendicular to the axis, one strain beam 2 will be stretched (e.g., beam A), while another strain beam 2 at a symmetrical position will be compressed (e.g., beam B). On beam A, the resistances of R1A and R3A increase, while the resistances of R2A and R4A decrease; on beam B, the situation is exactly the opposite, with the resistances of R1B and R3B decreasing and the resistances of R2B and R4B increasing. Because the circuit connection connects R1 (increasing) of beam A and R3 (decreasing) of beam B in series on the same arm, and R2 (decreasing) of beam A and R4 (increasing) of beam B in series on adjacent arms, this change is perfectly canceled out within the bridge. Therefore, although the strain gauge 4 on a single strain beam 2 senses strain, the overall output (Vout) of the bridge remains almost unchanged, thus achieving excellent resistance to off-center loads.

[0044] Temperature compensation: Changes in ambient temperature cause the resistance of all strain gauges 4 to change in the same direction and by the same amount. In a full-bridge circuit, this common-mode change is canceled out, so the output voltage is not affected by temperature drift, achieving temperature self-compensation.

[0045] The sidewall of the annular elastomer 1 is machined with a wiring chamber 6 and a cable interface 5. All leads of the strain gauges 4 are soldered to terminals within the wiring chamber 6 and then led out from the cable interface 5 via shielded cables. The wiring chamber 6 can be filled with sealant to protect the circuit from moisture and dust.

[0046] Example 2: Four-Strain Beam 2 Structure Sensor In another embodiment, to further enhance the sensor's symmetry and resistance to complex off-center loads (such as torque), the number of strain beams 2 can be increased to four. The four strain beams 2 are evenly distributed along the circumference of the annular elastic body 1, with adjacent beams spaced 90 degrees apart. The strain gauges 4 on each strain beam 2 are attached in the same way as in Embodiment 1, and the bridging principle is exactly the same. In this case, the Wheatstone full-bridge circuit will consist of a total of 16 strain gauges 4 (4 per beam), connected in series and parallel. Its resistance to off-center loads is similar, but it has a better suppression effect on bending moments and torques from different directions. This design is particularly suitable for applications requiring extremely high measurement accuracy and stability, such as aerospace or precision force-controlled robots.

[0047] Example 3: Shape variant of blind hole 3 The shape of the blind hole 3 is not limited to cylindrical. In other embodiments, a square groove or hemispherical blind hole 3 may be used depending on ease of processing or specific stress distribution optimization requirements. A square groove blind hole 3 may generate more concentrated stress in certain directions, while a hemispherical blind hole 3 helps to reduce stress peaks and improve fatigue life. The specific geometric parameters of the blind hole 3 (such as diameter / width, depth) need to be optimized and determined by finite element analysis for the specific sensor range and structural dimensions, but the core principle is that the depth must be less than the radial thickness of the annular elastomer 1 to maintain structural integrity.

[0048] The implementation principle of this utility model is as follows: This utility model discloses a high-precision anti-eccentric load ring force sensor, mainly used for force measurement in the industrial field. The sensor adopts an integrally molded ring elastic body 1 structure. Its core innovation lies in the design of asymmetrical strain beams 2 and blind holes 3, as well as the optimized strain gauge 4 patching and bridging technology. The center of the ring elastic body 1 is the force-bearing hole 11, and the upper and lower end faces are the load-bearing surfaces. On the inner wall of the ring elastic body 1, at least two symmetrically distributed narrow strain beams 2 are formed by precision machining, and blind holes 3 are machined on the back of the strain beams 2 (i.e., the non-directly force-bearing side) to accurately guide stress concentration and significantly improve the sensitivity of the sensor. The strain gauges 4 are pasted at a specific angle to a specific area of ​​the strain beams 2 and form a full-bridge circuit, which can effectively compensate for temperature drift and automatically suppress interference from non-target loads (eccentric loads) such as bending moment and torque, thereby ensuring that high-precision and high-stability tensile / compression signals can still be output under complex working conditions.

[0049] The embodiments described herein are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. A high-precision anti-eccentric load ring force sensor, comprising an integrally formed ring elastic body (1), wherein the ring elastic body (1) has a force-receiving hole (11) at its center, and the upper and lower end faces are respectively a first bearing surface (12) and a second bearing surface (13), characterized in that: The inner wall of the annular elastic body (1) is provided with at least two strain beams (2) symmetrically distributed along the circumference, and the outer wall of the annular elastic body (1) where the strain beams (2) are located is provided with blind holes (3) at corresponding positions; at least one strain gauge (4) is attached to each strain beam (2), and all strain gauges (4) are connected together to form a Wheatstone bridge circuit.

2. The high-precision anti-off-center load ring force sensor according to claim 1, characterized in that: The cross-section of the strain beam (2) is rectangular, and its width is less than half the perimeter of the inner wall of the annular elastic body (1) divided by the number of strain beams.

3. A high-precision anti-off-center load ring force sensor according to claim 1 or 2, characterized in that: The shape of the blind hole (3) is one of cylindrical, square groove or hemispherical, and its depth is less than the radial thickness of the annular elastomer (1).

4. A high-precision anti-off-center load ring force sensor according to claim 1, characterized in that: Each strain beam (2) is attached with four strain gauges (4), including two first strain gauges for sensing tensile strain and two second strain gauges for sensing compressive strain; the sensing grid direction of the first strain gauge is parallel to the axial direction of the annular elastomer (1) and is attached to the inner surface of the strain beam (2); the sensing grid direction of the second strain gauge is parallel to the axial direction of the annular elastomer (1) and is attached to the outer surface of the strain beam (2), and its attachment position is directly opposite to the bottom area of ​​the blind hole (3).

5. A high-precision anti-off-center load ring force sensor according to claim 4, characterized in that: Four strain gauges (4) are connected to form a Wheatstone full-bridge circuit, wherein the strain gauges on opposite bridge arms sense strain of the same nature.

6. A high-precision anti-off-center load ring force sensor according to claim 1, characterized in that: The sidewall of the annular elastomer (1) is also provided with a cable interface (5) for wiring and installation wiring and a wiring chamber (6).

7. The high-precision anti-off-center load ring force sensor according to claim 1, characterized in that: The material of the annular elastomer (1) is high-strength alloy steel, stainless steel or precipitation-hardening stainless steel.

8. A high-precision anti-off-center load ring force sensor according to claim 1, characterized in that: Multiple mounting threaded holes (14) are machined on both the first bearing surface (12) and the second bearing surface (13) for connecting and fixing to external equipment by bolts.

9. A high-precision anti-off-center load ring force sensor according to claim 1, characterized in that: The strain beams (2) are two or four in number and are uniformly and symmetrically distributed along the circumference of the annular elastic body (1).

10. A high-precision anti-off-center load ring force sensor according to claim 4, characterized in that: The strain gauge (4) is a metal foil strain gauge, which is attached to the strain beam (2) using a high-temperature curing adhesive.

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