Column type force sensor

Abstract

The utility model is suitable for the technical field of sensors, and provides a column type force sensor, which comprises a first support ring, a second support ring and at least four detection beams, the detection beams are connected between the first support ring and the second support ring along the vertical direction, and the at least four detection beams are uniformly distributed along the circumferential direction at intervals. And meanwhile, a structural hole is formed between two adjacent detection beams. Each detection beam is provided with a deformation structure, each deformation structure is provided with a strain gauge, and one end, connected with the first support ring and / or the second support ring, of each detection beam is provided with a threading hole for a cable to pass through and be electrically connected with the strain gauge. According to the embodiment of the utility model, the detection beam is connected between the two support rings along the vertical direction, and the deformation structure is arranged on the detection beam, so that the axial load can be directly converted into the local stress strain of the detection beam, and the sensitivity of the sensor is obviously improved; and the use requirements in a small-range and high-precision measurement scene can be well met.

Description

TECHNICAL FIELD

[0001] The utility model relates to sensor technical field especially relates to a column type force sensor. BACKGROUND

[0002] The cylindrical force sensor realizes the measurement of external load through the deformation of the internal elastic body, and can convert physical force (including tensile force, pressure, torque, strain and other mechanical quantities) into a measurable electric signal sensing device, and is widely used in industrial detection, mechanical testing, weighing instrument measurement and other fields. The cylindrical force sensor in the related art, its structure usually includes a cylindrical elastic body, an inner platform arranged at the center of the elastic body, and a detection beam transversely connected between the elastic body and the inner platform. The surface of the detection beam is attached with a strain gauge, when the sensor is subjected to an axial load, the elastic body is compressed or stretched, and the bending deformation of the detection beam is caused, and the strain gauge outputs a corresponding electric signal to realize the measurement of the force value.

[0003] However, the cylindrical force sensor under the structure, because of the transverse arrangement of the detection beam, its deformation mainly depends on the overall deformation transmission of the elastic body, when subjected to a small axial load, the bending strain amplitude of the detection beam is limited, and the sensitivity is low. Especially when measuring small range load, the signal output is weak, and it is difficult to realize small range and high sensitivity detection. UTILITY MODEL CONTENT

[0004] Therefore, the utility model provides a column type force sensor to solve the problem of low detection sensitivity and not meeting the detection needs of small range.

[0005] To solve the above problems, the technical scheme of the utility model embodiment is as follows:

[0006] A column type force sensor, comprising a first support ring, a second support ring and a detection beam, the detection beam is connected between the first support ring and the second support ring along the vertical direction, the detection beam is provided with at least four, each detection beam is spaced and uniformly distributed along the circumferential direction, and a structure hole is formed between two adjacent detection beams; Each detection beam is provided with a deformation structure capable of being strained under force, and the deformation structure is provided with a strain gauge for generating a detection signal according to strain, each detection beam is provided with a through hole for cable passing through and electrically connected with the strain gauge at one end connected with the first support ring and / or the second support ring.

[0007] In some embodiments, the deformation structure comprises: a first deformation hole penetrating through the inner side wall and the outer side wall of the detection beam to separate the detection beam into a first connecting arm and a second connecting arm arranged oppositely; a second deformation hole penetrating through the inner side wall and the outer side wall of the detection beam and located at one end of the first deformation hole close to the first support ring or the second support ring; a strain beam formed between the first deformation hole and the second deformation hole and having two ends connected to the first connecting arm and the second connecting arm, respectively; and the strain gauge is attached to the strain beam.

[0008] In some embodiments, the detection beam is provided with two second deformation holes, and the two second deformation holes are respectively located at two sides of the first deformation hole close to the first support ring and the second support ring; and each second deformation hole is spaced from the first deformation hole to form the strain beam, respectively.

[0009] In some embodiments, the thickness of the strain beam is less than the width of the first connecting arm and the second connecting arm, respectively.

[0010] In some embodiments, the width of the first deformation hole is less than or equal to the width of the second deformation hole.

[0011] In some embodiments, the deformation structure further comprises a protection groove opened in any one of the first connecting arm or the second connecting arm and communicated with the second deformation hole.

[0012] In some embodiments, the first connecting arm and the second connecting arm are respectively provided with the protection groove, and the two protection grooves are respectively communicated with different second deformation holes.

[0013] In some embodiments, the protection groove is provided in a straight line type and / or a curved line type.

[0014] In some embodiments, the first support ring and the second support ring are both circular; and the diameter of the first support ring is equal to the diameter of the second support ring.

[0015] In some embodiments, the first support ring and / or the second support ring is provided with a connecting hole for mounting.

[0016] The utility model discloses a kind of column force sensors, including first support ring, second support ring and detection beam, detection beam is connected between first support ring and second support ring along vertical direction, and detection beam is spaced and evenly distributed with at least four along circumferential direction, while structural hole is formed between adjacent two detection beams.And each detection beam is provided with the deformation structure that can be strained by force, deformation structure is provided with strain gauge for generating detection signal according to strain, each detection beam is connected with first support ring and / or with the end of second support ring, and the threading hole for cable is threaded with strain gauge electric connection is opened.The utility model embodiment is by being connected between two support rings along vertical direction with detection beam, and deformation structure is arranged on detection beam, axial load can be directly converted into the local stress strain of detection beam, so as to significantly improve the sensitivity of sensor, so that it can preferably meet the use needs in small range, high-precision measurement scene. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the three-dimensional structure schematic diagram of column force sensor provided by the utility model embodiment;

[0018] Figure 2 It is the front view of column force sensor provided by the utility model embodiment;

[0019] Figure 3 It is the structure schematic diagram of another column force sensor provided by the utility model embodiment.

[0020] Mark explanation:

[0021] 1, column force sensor;11, first support ring;12, second support ring;13, detection beam;131, deformation structure;1311, first deformation hole;1312, first connecting arm;1313, second connecting arm;1314, second deformation hole;1315, strain beam;1316, protection groove;14, structural hole;15, strain gauge;16, threading hole;17, connecting hole. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantage of the utility model more clear, the utility model will be described further in detail below with the help of drawings, the described embodiment should not be regarded as the limitation to the utility model, all other embodiments obtained by the person skilled in the art without doing creative work belong to the range of protection of the utility model.

[0023] In the specific embodiments described in the various specific technical features, in the case of no contradiction, any suitable way can be combined, for example, by combining different specific technical features to form different embodiments and technical solutions. In order to avoid unnecessary repetition, various possible combinations of each specific technical feature in the utility model are not described again.

[0024] In the following description, the terms "first, second, third, …" are only to distinguish similar objects, and do not represent the specific order of the objects. Understandably, "first, second, third, …" can be interchanged in specific order or sequence as allowed, so that the utility model embodiments described here can be implemented in an order other than that illustrated or described here.

[0025] It should be understood that the orientation description "upper", "lower", "outer", "inner" involved in the utility model embodiments are the orientations in the normal use state, and the "left" and "right" directions represent the left and right directions shown in the specific corresponding schematic diagram, which can be the left and right directions in the normal use state or not.

[0026] It should be noted that the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the sentence "includes one" does not exclude the presence of another identical element in the process, method, article or device including the element. "Multiple" means greater than or equal to two.

[0027] Unless otherwise defined, all technical and scientific terms used in the utility model embodiments have the same meaning as understood by those skilled in the art. The terms used in the utility model embodiments are only for the purpose of describing the utility model embodiments, not intended to limit the utility model.

[0028] As shown in Figure 1 and Figure 2 The utility model embodiments provide a column type force sensor 1, which can generate a detection signal according to the stress strain, and can be used in a scene where the size of the load borne needs to be detected. The column type sensor in the related art has insufficient sensitivity under small load due to the transverse arrangement of the detection beam, and cannot meet the use needs under small range and high sensitivity requirements. Therefore, the utility model embodiments provide a column type force sensor 1, which has high detection sensitivity and can be well applied to the use needs in the measurement scene of small range and high precision.

[0029] As shown in Figure 1 and Figure 2 The columnar force sensor 1 comprises a first support ring 11, a second support ring 12 and detection beams 13. The first support ring 11 and the second support ring 12 have the same outer profile, so that a cylindrical structure can be formed between the first support ring 11 and the second support ring 12. The detection beams 13 are straight beams and at least four are provided, each detection beam 13 is spaced and uniformly distributed along the circumferential direction of the cylindrical structure, and a structural hole 14 is formed between adjacent two detection beams 13. The detection beams 13 are connected between the first support ring 11 and the second support ring 12 along the vertical direction. In this way, the first support ring 11 and the second support ring 12 form the basic frame structure of the sensor under the connection of the at least four uniformly distributed detection beams 13. Each detection beam 13 is provided with a deformation structure 131 that can be strained under force, and a strain gauge 15 for generating a detection signal according to the strain is arranged on the deformation structure 131. At the same time, each detection beam 13 is provided with a through hole 16 at one end connected with the first support ring 11 and / or the second support ring 12, for the cable to pass through and electrically connect with the strain gauge 15. By such arrangement, when the deformation structure 131 is strained, the strain gauge 15 can generate a detection signal, and the detection signal can be output through the cable to realize the detection of load information (such as size or direction).

[0030] Specifically, the first support ring 11 and the second support ring 12 are the main mounting and force receiving components of the sensor, used to connect with the object generating the load. The first support ring 11 and the second support ring 12 can be made of metal materials (such as medium carbon alloy steel or stainless steel) with high rigidity and low creep characteristics, to ensure the stability of load transmission and the overall stability of the sensor structure. The detection beams 13 extend along the axial direction (i.e. vertical direction) of the sensor, and their two ends are connected with the first support ring 11 and the second support ring 12 respectively. This vertical connection mode makes the axial direction of the detection beams 13 parallel to the main axial load direction of the sensor, so that the detection sensitivity is better.

[0031] In one possible implementation, four detection beams 13 can be provided and evenly spaced in the circumferential direction. The four detection beams 13 can be symmetrically arranged in a "cross" shape or "X" shape. The detection beams 13 are spaced from each other in the circumferential direction, so as to form structural holes 14 without solid material in the interior between two adjacent detection beams 13. These structural holes 14 not only reduce the overall weight of the sensor, but also reduce the radial stiffness of the annular structure portion of the sensor when bearing axial load, so that the load can be more concentratedly transmitted through the vertical detection beams 13 without being dispersed by the annular portion, thereby creating conditions for the detection beams 13 to generate significant strain. It can be understood that the number of detection beams 13 is not limited to four, and in other possible implementations, six, eight or more detection beams 13 can be provided and evenly distributed in the circumferential direction to adapt to different measurement ranges, overload protection requirements or installation space limitations. By increasing the number of detection beams 13, the overall load capacity and lateral interference resistance of the sensor can be improved.

[0032] Specifically, each detection beam 13 is provided with a deformation structure 131 that can be strained under force. The deformation structure 131 is a local weakened or stress concentration area on the detection beam 13, which generates a bending or tensile / compressive strain much larger than other areas of the detection beam 13 when bearing axial load, and the strain gauge 15 is arranged in this area, so that the strain of the deformation structure 131 can be more sensitively detected and a detection signal can be generated, thereby improving the sensitivity of detection. The deformation structure 131 can be a groove, hole or variable cross-section area formed on the side or middle of the detection beam 13 by mechanical processing, so as to relatively weaken the stiffness of the detection beam 13 in this area and thus more easily generate strain. The strain gauge 15 can be an electric resistance strain gauge, which can be attached to the surface of the high-strain area generated by the deformation structure 131 by gluing or the like. The strain gauge 15 is connected into a Wheatstone bridge circuit (such as a full bridge or half bridge) to convert mechanical strain into a differential voltage signal for output. In order to compensate for the temperature effect, a compensation sheet can be attached near the deformation structure 131 or in the low-strain area of the detection beam 13, so as to improve the accuracy of the detection results of the sensor.

[0033] Each detection beam 13 has a threading hole 16 at the end connected with the first support ring 11 and / or the second support ring 12. The threading hole 16 can be a small-diameter hole provided on the end face or side face of the detection beam 13, which is used to accommodate the cable (such as an enameled wire or a flexible printed circuit) drawn out from the strain gauge 15. In some embodiments, the threading hole 16 can be provided at the upper end of the detection beam 13 connected with the first support ring 11, and the cable drawn out from the threading hole 16 can be collected in a wiring groove on the upper surface or inside of the first support ring 11, and finally drawn out from the top or bottom of the sensor. In other embodiments, the threading hole 16 can also be provided at the lower end of the detection beam 13 connected with the second support ring 12, or provided at both the upper and lower ends for wiring selection. By providing the independent threading hole 16, the cable can be regularly wired and protected, avoiding the problems of cable being pulled, worn or interfering with the signal, and improving the reliability and service life of the sensor.

[0034] The columnar force sensor 1 provided in the embodiments of the present utility model, through the design of the above structure, can cooperate with each other, when the axial pressure acts on the first support ring 11 and / or the second support ring 12, the pressure directly causes the compression deformation of each vertically arranged detection beam 13. Due to the existence of the structural hole 14, the deformation of the two support rings has less constraint on the detection beam 13, and the load can mainly act on the detection beam 13, so as to force the axial shortening of the detection beam 13 itself. The deformation structure 131 on the detection beam 13 becomes the concentrated deformation area of the compression bending deformation, can produce high strain, so that the resistance value of the strain gauge 15 attached to the deformation structure 131 changes significantly, and the bridge can output a larger voltage signal. Even if the axial force is very small, since the strain direction of the detection beam 13 under stress is the same as the vertical direction, the deformation structure 131 can focus and amplify the strain effect, and can produce a clear measurable electric signal, so as to realize the high-sensitivity detection under small range, and better meet the actual use needs.

[0035] In some embodiments, as Figure 1 and Figure 2As shown, the deformation structure 131 includes a first deformation hole 1311, a second deformation hole 1314 and a strain beam 1315. The first deformation hole 1311 is arranged through the inner side wall and the outer side wall of the detection beam 13 to separate the detection beam 13 into oppositely arranged first and second connecting arms 1312 and 1313. The second deformation hole 1314 is arranged through the inner side wall and the outer side wall of the detection beam 13 and located at one end of the first deformation hole 1311 close to the first support ring 11 or the second support ring 12. The strain beam 1315 is formed between the first deformation hole 1311 and the second deformation hole 1314 and connected to the first and second connecting arms 1312 and 1313 at two ends thereof, and the strain gauge 15 is attached to the strain beam 1315. Specifically, the "inner side wall" generally refers to the side of the detection beam 13 close to the sensor axis, and the "outer side wall" refers to the side away from the axis. By removing the internal solid material on the detection beam 13 to form the first and second deformation holes 1311 and 1314 spaced apart, the first deformation hole 1311 extends in the vertical direction with a proper size, thereby separating the detection beam 13 into two vertically extending, side-by-side and oppositely arranged first and second connecting arms 1312 and 1313, and the two ends (i.e. upper and lower ends) of the first and second connecting arms 1312 and 1313 remain connected to the first and second support rings 11 and 12, respectively. The second deformation hole 1314 is located at one end of the first deformation hole 1311 in the vertical direction (i.e. one end close to the first support ring 11 or the second support ring 12) and spaced apart from the first deformation hole 1311 in the axial direction. Since the depths of the first and second deformation holes 1311 and 1314 both completely penetrate the detection beam 13, they collectively "cut" an independent material region on the detection beam 13 to form the strain beam 1315. In this way, the strain beam 1315 has a hole structure without solid material on both sides thereof facing the first and second support rings 11 and 12, so that the strain beam 1315 is a high-sensitivity "micro-strain amplifier". When the sensor bears an axial load, a more significant bending or tensile-compressive deformation can be finally generated on the strain beam 1315. By attaching the strain gauge 15 to the strain beam 1315, the locally amplified strain can be sensitively sensed, so that a strong and stable electrical signal can be output even when the external axial load is very small. In this way, the signal-to-noise ratio of the sensor is optimized, which lays a structural foundation for realizing high-precision measurement of a very small range (such as a few newtons to a few hundred newtons).

[0036] Specifically, the first deformation hole 1311 and the second deformation hole 1314 can have the same or different shapes, such as a circular hole, an oblong hole, a rectangular hole, or a combined shape hole. Alternatively, the first deformation hole 1311 and the second deformation hole 1314 are both provided as a rectangular hole, and the corners of each side are rounded. The height (length) direction of the first deformation hole 1311 extends along the vertical (axial) direction of the detection beam 13, and the width direction is the same as the width direction of the detection beam 13 but smaller in size, so that the first connecting arm 1312 and the second connecting arm 1313 can be formed at both ends of the width direction, respectively. The height (length) of the second deformation hole 1314 is smaller than the width, so that the second deformation hole 1314 becomes a long and narrow hole structure, and a long and narrow strain beam 1315 is formed, which facilitates the attachment of the strain gauge 15.

[0037] In some embodiments, the thickness of the strain beam 1315 (i.e., the vertical distance between the first deformation hole 1311 and the second deformation hole 1314) can be set to be smaller than the width of the first connecting arm 1312 and the second connecting arm 1313, respectively. In this way, the thinner strain beam 1315 can have a larger strain under the same load, thereby having higher sensitivity. The thickness can be accurately designed and processed according to the target range and sensitivity requirements.

[0038] Specifically, the strain gauge 15 is preferably provided as two or four, and is attached to the surface of the middle region of the strain beam 1315 in the vertical direction. Specifically, the strain gauge 15 can be attached to the inner side wall and / or the outer side wall of the strain beam 1315. For example, in a high-sensitivity full-bridge configuration, two strain gauges 15 (one for sensing tensile strain and one for sensing compressive strain or as temperature compensation) can be attached to the center region of the inner side wall of the strain beam 1315, and another two strain gauges 15 can be attached to the corresponding positions of the outer side wall, together forming a Wheatstone bridge. This arrangement can maximize the use of the strain field on the surface of the strain beam 1315, output the maximum signal voltage, and at the same time have good temperature self-compensation function, thereby improving the stability and accuracy of the measurement.

[0039] In some embodiments, as shown in FIG. 13B, the strain beam 1315 can be provided as a long and narrow structure, and the first deformation hole 1311 and the second deformation hole 1314 can be provided as long and narrow holes. Figure 1 and Figure 2As shown, the detection beam 13 is provided with two second deformation holes 1314, which are respectively located on the two sides of the first deformation hole 1311 close to the first support ring 11 and the second support ring 12. And each second deformation hole 1314 can be spaced from the first deformation hole 1311 to form a strain beam 1315 respectively. In this way, two strain beams 1315 are formed on each detection beam 13, which can further weaken the stiffness of the entire detection beam 13, thereby improving the sensitivity of the overall detection. The shape and manner of arranging the two second deformation holes 1314 are the same, and will not be repeated here. In addition, there are at least two strain gauges 15 on each strain beam 1315, so that the strain gauges 15 on the two strain beams 1315 can be combined to form a Wheatstone full-bridge circuit, thereby having a more sensitive detection performance.

[0040] In some embodiments, the width of the first deformation hole 1311 is less than or equal to the width of the second deformation hole 1314. Specifically, since the strain gauges 15 are attached to the surface of the strain beam 1315 located in the first deformation hole 1311 (i.e., the inner wall of the first deformation hole 1311), the width of the first deformation hole 1311 is set to be less than or equal to the width of the second deformation hole 1314. In this way, one side of each strain beam 1315 located in the second deformation hole 1314 has a longer material-free area, ensuring that both sides of the position of each strain gauge 15 attached to the strain beam 1315 are free of solid materials, so that each strain gauge 15 is located in the region where the strain beam 1315 is easy to produce strain, thereby improving the sensitivity of the detection.

[0041] In some embodiments, as shown in Figure 1 and Figure 2 As shown, the deformation structure 131 further includes a protection groove 1316, which is opened in any one of the first connecting arm 1312 or the second connecting arm 1313 and communicates with the second deformation hole 1314. Specifically, the protection groove 1316 is a groove machined inward from the side of the first detection arm or the second detection arm (one side located in the structure hole 14). One end of the groove is in communication with the second deformation hole 1314, so that the second deformation hole 1314 and the protection groove 1316 together form a continuous cavity region with a specific shape. The protection groove 1316 can be a groove with a predetermined depth, or a through groove, which completely separates the solid material at the setting position to become a separation groove. In this way, not only can the sensitivity of the strain beam 1315 under stress be further improved, but also when the detection beam 13 is under overload stress, the irreversible damage of the strain beam 1315 or the strain gauge 15 can be avoided through the "fusing" protection of the protection groove 1316, thereby also playing a role in protecting the sensor.

[0042] In some embodiments, as shown in Figure 2As shown, the first connecting arm 1312 and the second connecting arm 1313 are respectively provided with protective grooves 1316, and the two protective grooves 1316 are respectively connected to different second deformation holes 1314. With this arrangement, the first connecting arm 1312 and the second connecting arm 1313 are vertically separated by their corresponding protective grooves 1316, yet connected to each other by two strain beams 1315, thus still enabling stress detection. The protective grooves 1316 also have the function of eliminating internal stress, thereby enabling the sensor to achieve high sensitivity detection while also having overload protection, further improving the reliability of the sensor's performance.

[0043] In some embodiments, the protective groove 1316 is configured as a straight line and / or a curved line. That is, the protective groove 1316 can be entirely straight, entirely curved, or a combination of straight and curved sections. Various configuration methods are possible, provided that overload protection can be reliably achieved.

[0044] In some embodiments, such as Figure 1 and Figure 3 As shown, both the first support ring 11 and the second support ring 12 are circular, and the diameters of the first support ring 11 and the second support ring 12 are equal. By designing the first support ring 11 and the second support ring 12 as circular with equal diameters, the sensor has a completely symmetrical geometry in the axial direction. When an axial load is applied to the two support rings, the force is transmitted from the loading surface through the ring body to multiple detection beams 13 that are evenly distributed circumferentially, ensuring that each detection beam 13 is uniformly loaded. Moreover, the circular structure itself has no stress concentration sharp corners, which can evenly disperse the local stress from the connection interface. When there is a slight off-center load, the circular support ring can redistribute the load to a certain extent through the continuity of its ring structure, reducing the impact of the off-center load on the individual detection beam 13, so that the sensor's anti-off-center load performance remains consistent in both directions, which is beneficial to improving measurement accuracy and repeatability.

[0045] Optionally, the vertical cross-sectional shapes of the first support ring 11 and the second support ring 12 are kept the same, which facilitates manufacturing and ensures consistent overall testing performance. This cross-sectional shape can be rectangular or I-shaped, reducing weight while ensuring sufficient bending and compressive stiffness.

[0046] In some embodiments, such as Figure 3As shown, the first support ring 11 and / or the second support ring 12 is provided with a connecting hole 17 for installation. Specifically, the connecting hole 17 is an interface through or not through the support ring body, for rigidly connecting the sensor with the upper loading device (such as a pressure head, an actuator) and the lower mounting base (such as a rack, a platform) through standard fasteners such as bolts, screws, pins, etc. The specific form (such as thread specification, hole depth, number) of the connecting hole 17 can be designed according to different load requirements and installation space, so that the sensor can be flexibly adapted to the use requirements in different scenes. By reasonably setting the connecting hole 17, the external load can be introduced into the sensor in the designed expected way, and finally the accurate force measurement with high sensitivity and small range can be reliably realized. Moreover, through the fixed connection of the connecting hole 17, the sensor can also be used for the detection of tension, thereby improving the range of use.

[0047] The above is only an embodiment of the present application, and is not used to limit the protection scope of the present application. Any modification, equivalent replacement and improvement within the spirit and scope of the present application are included in the protection scope of the present application.

Claims

1. A column-type force sensor, characterized in that, The device includes a first support ring, a second support ring, and detection beams. The detection beams are vertically connected between the first and second support rings. At least four detection beams are provided, and each detection beam is spaced apart and evenly distributed in the circumferential direction. A structural hole is formed between two adjacent detection beams. Each detection beam is provided with a deformation structure that can be subjected to stress and strain. The deformation structure is provided with a strain gauge for generating a detection signal based on the strain. Each detection beam has a through hole at one end connected to the first support ring and / or the second support ring for a cable to pass through and be electrically connected to the strain gauge.

2. The column-type force sensor as described in claim 1, characterized in that... The deformable structure includes: A first deformation hole is provided, penetrating the inner and outer walls of the detection beam, to divide the detection beam into a first connecting arm and a second connecting arm that are arranged opposite to each other. The second deformation hole is provided through the inner and outer walls of the detection beam and is located at one end of the first deformation hole near the first support ring or the second support ring; A strain beam is formed between the first deformation hole and the second deformation hole, and its two ends are respectively connected to the first connecting arm and the second connecting arm; The strain gauge is attached to the strain beam.

3. The column-type force sensor as described in claim 2, characterized in that... The detection beam is provided with two second deformation holes, which are located on both sides of the first deformation hole near the first support ring and the second support ring, respectively. Each of the second deformation holes is spaced apart from the first deformation hole to form the strain beam, respectively.

4. The column-type force sensor as described in claim 2, characterized in that... The thickness of the strain beam is less than the width of the first connecting arm and the second connecting arm, respectively.

5. The column-type force sensor as described in claim 2 or 3, characterized in that... The width of the first deformation hole is less than or equal to the width of the second deformation hole.

6. The column-type force sensor as described in claim 2, characterized in that... The deformable structure further includes: A protective groove is formed on either the first connecting arm or the second connecting arm and communicates with the second deformation hole.

7. The column-type force sensor as described in claim 6, characterized in that... The first connecting arm and the second connecting arm are respectively provided with the protective groove, and the two protective grooves are respectively connected to different second deformation holes.

8. The column force sensor as described in claim 6 or 7, characterized in that... The protective groove is configured as a straight line and / or a curved line.

9. The column-type force sensor as described in any one of claims 1 to 4, characterized in that... Both the first support ring and the second support ring are circular; wherein the diameter of the first support ring and the diameter of the second support ring are equal.

10. The column-type force sensor as described in any one of claims 1 to 4, characterized in that... The first support ring and / or the second support ring are provided with connection holes for installation.

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