A small range micro tensile and compressive force sensor with anti-bias load capacity

Abstract

The utility model provides a small range miniature tension and compression force sensor with anti eccentric load capacity, including elastomer outer ring, be provided with through hole in elastomer outer ring, install elastomer inner ring in through hole, be provided with four groups of strain beam group between the inner wall of through hole and the outer wall of elastomer inner ring, four groups of strain beam group equidistance setting, be provided with a plurality of strain gages on strain beam group, be connected with the outgoing line on strain gage, each group of strain beam group includes first arched strain beam and second arched strain beam, first arched strain beam and second arched strain beam are along the same central axis symmetry setting, and the direction of first arched strain beam and second arched strain beam's concave is opposite, and the outgoing line is arranged between first arched strain beam and second arched strain beam. The sensor increases the anti eccentric load capacity of the sensor through the strain beam group of arch bridge type structure, eliminates the influence of eccentric load on the measurement force value accuracy.

Description

Technical Field

[0001] This invention belongs to the technical field of resistive strain sensors, specifically a small-range miniature tensile and compressive sensor with anti-eccentric load capability. Background Technology

[0002] Miniature tensile and compressive strain sensors, as a type of resistive strain sensor, are widely used in servo systems such as robots. In practical applications, the measurement accuracy of this type of sensor can generally reach around 0.1%. However, in actual use, the system being measured usually has a certain off-center load, i.e., perpendicular to or at a certain angle to the actual measured force value. Through practical application and simulation analysis, when an off-center load exists, its influence on the measured force value can reach up to about 10%, and the degree of influence is positively correlated with the magnitude of the off-center load.

[0003] To address the aforementioned issues, existing solutions include designing the beam as an integral structure and attaching a fan-shaped circular strain gauge as the sensitive grid. However, this approach can lead to difficulties in manufacturing and structural strength due to the excessively thin beam for small-range sensors. Another solution is to design the sensor as a spoke-type structure, but this structure is less effective at eliminating the impact of off-center loads on measurement accuracy. Utility Model Content

[0004] To address the challenges of manufacturing integral structures in small-range sensors, which are difficult to produce, and the poor performance of spoke-type structures in eliminating the impact of off-center load on measurement accuracy, this invention proposes a small-range miniature tensile and compressive sensor with off-center load resistance. This sensor satisfies the requirements of small range, miniaturization, structural strength, and strain, while also possessing the necessary off-center load resistance.

[0005] To achieve the above objectives, this utility model provides the following technical solution: This utility model proposes a small-range micro tensile and compressive sensor with anti-eccentric load capability, including an elastic outer ring, a through hole provided in the elastic outer ring, an elastic inner ring installed in the through hole, four sets of strain beams provided between the inner wall of the through hole and the outer wall of the elastic inner ring, the four sets of strain beams are equally spaced, multiple strain gauges are provided on the strain beams, and lead wires are connected to the strain gauges; Each group of strain beams includes a first arched strain beam and a second arched strain beam. The first arched strain beam and the second arched strain beam are symmetrically arranged along the same central axis, and the concave directions of the first arched strain beam and the second arched strain beam are opposite. The lead wire is threaded between the first arched strain beam and the second arched strain beam.

[0006] Preferably, the four sets of strain beams form a cross-shaped structure between the outer ring of the elastic body and the inner ring of the elastic body.

[0007] Preferably, four strain gauges are provided, namely strain gauge T1, strain gauge T2, strain gauge C1 and strain gauge C2; Wherein, the T1 strain gauge and the T2 strain gauge are disposed on the first arched strain beam near the inner ring of the elastic body, and the C1 strain gauge and the C2 strain gauge are disposed on the second arched strain beam near the inner ring of the elastic body; The T1 strain gauge and the C1 strain gauge are symmetrically arranged in the same group of strain beams, and the T2 strain gauge and the C2 strain gauge are symmetrically arranged in the same group of strain beams.

[0008] Preferably, the T1 strain gauge, C1 strain gauge, T2 strain gauge and C2 strain gauge are connected in series to form a Wheatstone circuit.

[0009] Preferably, eight strain gauges are provided, namely strain gauge T1, strain gauge T2, strain gauge T3, strain gauge T4, strain gauge C1, strain gauge C2, strain gauge C3 and strain gauge C4. The T1 strain gauge, the T2 strain gauge, the T3 strain gauge, and the T4 strain gauge are disposed on the first arched strain beam near the inner ring of the elastic body; The C1 strain gauge, the C2 strain gauge, the C3 strain gauge, and the C4 strain gauge are disposed on the second arched strain beam near the inner ring of the elastic body; Each of the first arched strain beams and the second arched strain beams is equipped with a strain gauge; The T1 strain gauge and the C1 strain gauge are symmetrically arranged in the same group of strain beams; the T2 strain gauge and the C2 strain gauge are symmetrically arranged in the same group of strain beams; the T3 strain gauge and the C3 strain gauge are symmetrically arranged in the same group of strain beams; and the T4 strain gauge and the C4 strain gauge are symmetrically arranged in the same group of strain beams.

[0010] Preferably, the T2 strain gauge, the T1 strain gauge, the C1 strain gauge, the C2 strain gauge, the T3 strain gauge, the T4 strain gauge, the C4 strain gauge, and the C3 strain gauge are connected in series to form a Wheatstone circuit.

[0011] Preferably, the strain gauges are provided in sixteen units, namely T1 strain gauge, T2 strain gauge, T3 strain gauge, T4 strain gauge, T5 strain gauge, T6 strain gauge, T7 strain gauge, T8 strain gauge, C1 strain gauge, C2 strain gauge, C3 strain gauge, C4 strain gauge, C5 strain gauge, C6 strain gauge, C7 strain gauge and C8 strain gauge. The strain gauges T1, T2, T3, T4, C5, C6, C7, and C8 are disposed on the first arched strain beam, with the T1, T2, T3, and T4 strain gauges positioned near the inner ring of the elastic body, and the C5, C6, C7, and C8 strain gauges positioned near the outer ring of the elastic body. The T1 strain gauge and the C5 strain gauge, the T2 strain gauge and the C6 strain gauge, the T3 strain gauge and the C7 strain gauge, and the T4 strain gauge and the C8 strain gauge are arranged on the same first arched strain beam; the T5 strain gauge, the T6 strain gauge, the T7 strain gauge, the T8 strain gauge, the C1 strain gauge, the C2 strain gauge, the C3 strain gauge, and the C4 strain gauge are arranged on the second arched strain beam; the T5 strain gauge, the C1 strain gauge, the C2 strain gauge, the C6 strain gauge, the C7 strain gauge, the C8 strain gauge, the C1 strain gauge, the C2 strain gauge, and the C4 strain gauge are arranged on the same first arched strain beam. The strain gauges T6, C3, T7, and C4 are grouped together and arranged on the same second arched strain beam. The strain gauges T5, T6, T7, and T8 are positioned near the outer ring of the elastic body on the second arched strain beam, while the strain gauges C1, C2, C3, and C4 are positioned near the inner ring of the elastic body on the second arched strain beam. Two strain gauges are provided on both the first arched strain beam and the second arched strain beam. The T1 strain gauge and the C1 strain gauge are symmetrically arranged in the same group of strain beams; the T5 strain gauge and the C5 strain gauge are symmetrically arranged in the same group of strain beams; the T2 strain gauge and the C2 strain gauge are symmetrically arranged in the same group of strain beams; the T6 strain gauge and the C6 strain gauge are symmetrically arranged in the same group of strain beams; the T3 strain gauge and the C3 strain gauge are symmetrically arranged in the same group of strain beams; the T7 strain gauge and the C7 strain gauge are symmetrically arranged in the same group of strain beams; the T4 strain gauge and the C4 strain gauge are symmetrically arranged in the same group of strain beams; the T8 strain gauge and the C8 strain gauge are symmetrically arranged in the same group of strain beams.

[0012] Preferably, the T4 strain gauge, the T3 strain gauge, the T2 strain gauge, the T1 strain gauge, the C1 strain gauge, the C2 strain gauge, the C3 strain gauge, the C4 strain gauge, the T5 strain gauge, the T6 strain gauge, the T7 strain gauge, the T8 strain gauge, the C8 strain gauge, the C7 strain gauge, the C6 strain gauge, and the C5 strain gauge are connected in series to form a Wheatstone circuit.

[0013] Preferably, both the outer and inner rings of the elastic body are provided with flange mounting holes for connecting the system under test.

[0014] Preferably, both the outer elastic ring and the inner elastic ring are made of stainless steel or aluminum alloy.

[0015] Compared with the prior art, the present invention has the following beneficial technical effects: This invention proposes a small-range micro tensile and compressive sensor with anti-eccentric load capability. In this sensor, a strain beam group consisting of a first arched strain beam and a second arched strain beam is set between the inner and outer rings of the elastic body. The strain beam group has a double-layer arch bridge structure. During use, the positive and negative strains of the strain gauge are canceled out by the eccentric load, and their sum is zero. That is, the strain beam group with arch bridge structure increases the sensor's anti-eccentric load capability and eliminates the influence of eccentric load on the accuracy of the measured force value.

[0016] Furthermore, the four strain beams in this sensor form a cross-shaped structure between the outer and inner rings of the elastic body. Compared with the integral beam type, it can generate a larger strain under the same beam thickness, realize the measurement of tensile and compressive forces in a small range, and avoid the difficulties in processing and weak structural strength caused by the beam of the small range sensor being too thin. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram from one perspective of a small-range micro tensile and compressive sensor with anti-eccentric load capability proposed in this utility model. Figure 2 This is a three-dimensional structural schematic diagram from another perspective of a small-range micro tensile and compressive sensor with anti-eccentric load capability proposed in this utility model. Figure 3 This is a top view schematic diagram of a small-range micro tensile and compressive sensor with anti-eccentric load capability proposed in this utility model. Figure 4 for Figure 3 Cross-sectional view at point AA; Figure 5 for Figure 4 Cross-sectional view at point BB; Figure 6 for Figure 5Enlarged view of point C in the middle; Figure 7 This is a schematic diagram of an embodiment of a small-range micro tensile and compressive sensor with anti-eccentric load capability proposed in this utility model; Figure 8 for Figure 7 Schematic diagram of circuit connection for medium strain beam assembly; Figure 9 This is a schematic diagram of another embodiment of a small-range micro tensile and compressive sensor with anti-eccentric load capability proposed in this utility model; Figure 10 for Figure 9 Schematic diagram of circuit connection for medium strain beam assembly; Figure 11 This is a schematic diagram of another embodiment of a small-range miniature tensile and compressive sensor with anti-eccentric load capability proposed in this utility model. Figure 12 for Figure 11 Schematic diagram of circuit connection for medium strain beam assembly; Figure 13 This is a deformation diagram of a small-range micro tensile and compressive sensor with anti-eccentric load capability proposed in this utility model under stress. In the attached diagram: 1. Outer ring of elastic body; 2. Inner ring of elastic body; 3. Strain beam assembly; 31. First arched strain beam; 32. Second arched strain beam; 4. Strain gauge. Detailed Implementation

[0018] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0019] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", 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.

[0020] Furthermore, the terms "first" and "second" 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" or "second" 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.

[0021] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; 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.

[0022] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0024] This invention proposes a small-range miniature tensile and compressive sensor with anti-eccentric load capability, such as... Figures 1-6As shown, the system includes an outer elastic ring 1, a through hole inside the outer elastic ring 1, an inner elastic ring 2 installed inside the through hole, and four sets of strain beam groups 3 arranged between the inner wall of the through hole and the outer wall of the inner elastic ring 2. The four sets of strain beam groups 3 are equally spaced, and multiple strain gauges 4 are installed on the strain beam groups 3, with lead wires connected to the strain gauges 4. Each set of strain beam groups 3 includes a first arched strain beam 31 and a second arched strain beam 32. One end face of the first arched strain beam 31 and the second arched strain beam 32 is concave, while the opposite end face and other end faces are flat. The first arched strain beam 31 and the second arched strain beam 32 are symmetrically arranged along the same central axis, and the first arched strain beam 31 is concave. One end of the variable beam 31 and the second arched strain beam 32 is fixed to the inner wall of the inner ring 2 of the elastic body, and the other end of the first arched strain beam 31 and the second arched strain beam 32 is fixed to the outer wall of the outer ring 1 of the elastic body. The concave directions of the first arched strain beam 31 and the second arched strain beam 32 are opposite. On the same cross section, the arcs of the concave structures of the first arched strain beam 31 and the second arched strain beam 32 are located on the same construction circle. A lead wire is passed between the first arched strain beam 31 and the second arched strain beam 32, and a through hole is provided on the outer ring 1 corresponding to the positions of the first arched strain beam 31 and the second arched strain beam 32. The lead wire passes through the through hole. In this sensor, the outer ring 1 of the elastic body is connected to the fixed end of the measured system, and the inner ring 2 of the elastic body is connected to the force measuring end of the measured system. In order to realize the bidirectional force measurement of tension and compression, the force loading end of the inner ring 2 of the elastic body should be higher than the outer ring 1 of the elastic body, while the other end of the inner ring 2 of the elastic body should be lower than the outer ring 1 of the elastic body.

[0025] In this embodiment, both the first arched strain beam 31 and the second arched strain beam 32 are arch bridge structures. Through simulation and testing comparisons, it was found that during testing, the force arm of the eccentric load was eight times the total height of the sensor. Compared to single-layer straight beams and single-layer arch bridges, the double-layer arch bridge exhibits significantly greater resistance to eccentric loads. Furthermore, testing analysis shows that the double-layer arch bridge can offset the influence of eccentric loads in any direction on measurement accuracy. The impact of eccentric loads on the accuracy of various beam types is as follows: for single-layer straight beams, the impact is 7%–10%; for single-layer arch bridges, the impact is 2%–3%; while for double-layer arch bridges, there is no impact. Specifically, this is because the positive and negative strains acting on the strain gauge 4 cancel each other out, resulting in a sum of zero. Therefore, it does not affect the sensor's detection of the actual measured force. The impact of eccentric loads on the accuracy of various beam types is shown in the table below.

[0026] like Figures 1-3As shown, in this embodiment, four strain beam groups 3 form a cross-shaped structure between the outer ring 1 and the inner ring 2 of the elastic body. The strain beam group 3 adopts a spoke-type structure and is evenly distributed in four places. Moreover, the strain beam group 3 is a curved beam structure, which can collect a larger strain under the same wall thickness. According to data comparison, under the same wall thickness, the spoke beam has a strain of about 70-100% compared with the integral beam type. That is, when using the integral beam type, the beam thickness is about half that of the spoke type. It can be seen that the spoke beam type can avoid the situation that the beam body of the integral beam type is too thin and difficult to process for small range sensors, thereby improving the structural strength of the beam body.

[0027] In this embodiment, the strain gauge 4 is attached to the side of the first arched strain beam 31 or the second arched strain beam 32 near the outer ring 1 or the inner ring 2 of the elastic body. When attaching the strain gauge, the strain gauge 4 should be centered along the left and right sides of the first arched strain beam 31 or the second arched strain beam 32, and as close as possible to the root of the junction between the first arched strain beam 31 or the second arched strain beam 32 and the outer ring 1 or the inner ring 2 of the elastic body, so as to sense a larger strain.

[0028] like Figure 7 and Figure 8 As shown, an embodiment of the arrangement of strain gauges 4 is proposed, wherein four strain gauges 4 are provided, namely strain gauge T1, strain gauge T2, strain gauge C1 and strain gauge C2. Strain gauges T1 and T2 are positioned on the first arched strain beam 31 near the inner ring 2 of the elastic body, while strain gauges C1 and C2 are positioned on the second arched strain beam 32 near the inner ring 2 of the elastic body. Strain gauges T1 and C1 are symmetrically arranged within the same group of strain beams 3, and strain gauges T2 and C2 are symmetrically arranged within the same group of strain beams 3. Figure 6 As described above, strain gauges T1, C1, T2, and C2 are connected in series to form a Wheatstone circuit. After the bridge is assembled, the sensor's lead wires are routed between the first arched strain beam 31 and the second arched strain beam 32, and electrically connected to the measured system. In this sensor, when four strain gauges are attached, the cost is low, and the accuracy can reach approximately 0.2% to 0.3%.

[0029] like Figure 9 and Figure 10As shown, another embodiment of the strain gauge 4 arrangement is proposed, wherein eight strain gauges 4 are provided, namely strain gauges T1, T2, T3, T4, C1, C2, C3, and C4; strain gauges T1, T2, T3, and T4 are positioned on the first arched strain beam 31 near the inner ring 2 of the elastic body; strain gauges C1, C2, C3, and C4 are positioned on the second arched strain beam 32 near the inner ring 2 of the elastic body; one strain gauge is provided on each of the first and second arched strain beams 31; strain gauges T1 and C1 are symmetrically arranged in the same group of strain beams 3, strain gauges T2 and C2 are symmetrically arranged in the same group of strain beams 3, strain gauges T3 and C3 are symmetrically arranged in the same group of strain beams 3, and strain gauges T4 and C4 are symmetrically arranged in the same group of strain beams 3. Figure 9 As shown, strain gauges T2, T1, C1, C2, T3, T4, C4, and C3 are connected in series to form a Wheatstone circuit. After the bridge is assembled, the sensor leads are routed between the first arched strain beam 31 and the second arched strain beam 32, and electrically connected to the measured system. In this sensor, when eight strain gauges are attached, the cost is moderate, and the accuracy can reach within 0.1%.

[0030] like Figure 11 and Figure 12 As shown, another embodiment of the strain gauge 4 arrangement is proposed, wherein sixteen strain gauges 4 are provided, namely T1 strain gauge, T2 strain gauge, T3 strain gauge, T4 strain gauge, T5 strain gauge, T6 strain gauge, T7 strain gauge, T8 strain gauge, C1 strain gauge, C2 strain gauge, C3 strain gauge, C4 strain gauge, C5 strain gauge, C6 strain gauge, C7 strain gauge and C8 strain gauge; Strain gauges T1, T2, T3, T4, C5, C6, C7, and C8 are mounted on the first arched strain beam 31, with T1, T2, T3, and T4 positioned near the inner ring 2 of the elastic body, and C5, C6, C7, and C8 positioned near the outer ring 1 of the elastic body. Strain gauges C5, T2, C6, T3, C7, T4, and C8 are arranged on the same first arched strain beam 31; strain gauges T5, T6, T7, T8, C1, C2, C3, and C4 are arranged on the second arched strain beam 32; strain gauges T5, T6, T7, T8, C1, C2, C3, and C4 are arranged on the same first arched strain beam 31; strain gauges T5, T6, T7, T8, C1, C2, T6, C3, T7, and C8 are arranged on the same first arched strain beam 31; strain gauges T5, T6, T7, T8, C1, C2, C3, and T7 are arranged on the same first arched strain beam 32. Strain gauges T1, T2, T3, and T4 are grouped together and arranged on the same second arched strain beam 32. Strain gauges T5, T6, T7, and T8 are positioned near the outer ring 2 of the elastic body on the second arched strain beam 32, while strain gauges C1, C2, C3, and C4 are positioned near the inner ring 2 of the elastic body on the second arched strain beam 32. Two strain gauges are mounted on both the first and second arched strain beams 31 and 32. Strain gauges T1 and C1 are symmetrically arranged, as are T5 and C5, T2 and C2, T6 and C6, T3 and C3, T7 and C7, and T4 and T8 are symmetrically arranged within the same strain beam group 3. Figure 11 As shown, strain gauges T4, T3, T2, T1, C1, C2, C3, C4, T5, T6, T7, T8, C8, C7, C6, and C5 are connected in series to form a Wheatstone circuit. After the bridge is assembled, the sensor leads are routed between the first arched strain beam 31 and the second arched strain beam 32, and electrically connected to the measured system. In this sensor, when sixteen strain gauges are attached, the cost is relatively high, but the accuracy can reach within 0.05%.

[0031] Preferably, in the above embodiment, both the outer ring 1 and the inner ring 2 of the elastic body are provided with flange mounting holes for connecting the system under test, and the flange mounting holes provided on the inner ring 2 of the elastic body are staggered with the strain beam 3. In this embodiment, a boss is provided on the outer wall of the outer ring 1 of the elastic body, and a flange mounting hole is provided on the boss. The flange mounting hole is a threaded hole, which realizes the compression of the outer ring 1 of the elastic body in the length and width directions, which can further enable the sensor to achieve the characteristics of miniaturization and light weight.

[0032] To achieve the characteristics of miniaturization and light weight of the sensor, in this embodiment, both the outer elastic outer ring 1 and the inner elastic inner ring 2 are made of stainless steel or aluminum alloy. Furthermore, through Ansys analysis, the volume and structural features are further compressed and reduced while meeting the requirements of strength and strain.

[0033] like Figure 13 As shown, when the inner ring 2 of the elastic body is subjected to a pressure load, the strain beams 3 on the inner ring 2 and outer ring 1 of the elastic body generate mechanical strain that is directly proportional to the pressure value. According to the force analysis in the figure, the upper strain gauge 4 is subjected to compressive force, and the lower strain gauge 4 is subjected to tensile force. At this time, the strain gauge 4 converts the mechanical strain into a proportional change in resistance. The resistance of the strain gauge subjected to compressive force decreases proportionally, and the resistance of the strain gauge subjected to tensile force increases proportionally. Therefore, when the Wheatstone bridge composed of the strain gauges 4 in the above embodiment is connected to a power supply, a voltage signal that changes proportionally to the pressure value can be detected. Conversely, when the sensor is subjected to a reverse tensile load, analysis shows that the upper strain gauge 4 is subjected to tensile force, and the lower strain gauge 4 is subjected to compressive force. Therefore, a voltage signal that still changes proportionally to the pressure value but with opposite high and low voltage values ​​can be detected.

[0034] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0035] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that can be understood by those skilled in the art. The above content is only for illustrating the technical concept of this utility model and should not be used to limit the scope of protection of this utility model. Any modifications made to the technical solutions based on the technical concept proposed by this utility model shall fall within the scope of protection of the claims of this utility model.

Claims

1. A small-range miniature tensile and compressive sensor with anti-eccentric load capability, characterized in that, The system includes an elastic outer ring (1), a through hole is provided inside the elastic outer ring (1), an elastic inner ring (2) is installed inside the through hole, four sets of strain beam groups (3) are provided between the inner wall of the through hole and the outer wall of the elastic inner ring (2), the four sets of strain beam groups (3) are equally spaced, and multiple strain gauges (4) are provided on the strain beam groups (3), and lead wires are connected to the strain gauges (4). Each group of strain beams (3) includes a first arched strain beam (31) and a second arched strain beam (32). The first arched strain beam (31) and the second arched strain beam (32) are symmetrically arranged along the same central axis, and the concave directions of the first arched strain beam (31) and the second arched strain beam (32) are opposite. The lead wire is threaded between the first arched strain beam (31) and the second arched strain beam (32).

2. A small-range miniature tensile / compressive sensor with anti-eccentric load capability according to claim 1, characterized in that, The four strain beam groups (3) form a cross-shaped structure between the outer ring (1) and the inner ring (2) of the elastic body.

3. A small-range miniature tensile / compressive sensor with anti-eccentric load capability according to claim 1, characterized in that, The strain gauge (4) is provided with four strain gauges, namely T1 strain gauge, T2 strain gauge, C1 strain gauge and C2 strain gauge; Among them, the T1 strain gauge and the T2 strain gauge are set on the first arched strain beam (31) near the inner ring (2) of the elastic body, and the C1 strain gauge and the C2 strain gauge are set on the second arched strain beam (32) near the inner ring (2) of the elastic body; The T1 strain gauge and the C1 strain gauge are symmetrically arranged in the same group of strain beams (3), and the T2 strain gauge and the C2 strain gauge are symmetrically arranged in the same group of strain beams (3).

4. A small-range miniature tensile / compressive sensor with anti-eccentric load capability according to claim 3, characterized in that, The strain gauges T1, C1, T2, and C2 are connected in series to form a Wheatstone circuit.

5. A small-range miniature tensile / compressive sensor with anti-eccentric load capability according to claim 1, characterized in that, The strain gauges (4) are provided in eight types, namely T1 strain gauge, T2 strain gauge, T3 strain gauge, T4 strain gauge, C1 strain gauge, C2 strain gauge, C3 strain gauge and C4 strain gauge; The T1 strain gauge, the T2 strain gauge, the T3 strain gauge and the T4 strain gauge are arranged on the first arched strain beam (31) near the inner ring (2) of the elastic body; The C1 strain gauge, the C2 strain gauge, the C3 strain gauge and the C4 strain gauge are arranged on the second arched strain beam (32) near the inner ring (2) of the elastic body; Each of the first arched strain beam (31) and the second arched strain beam (32) is provided with a strain gauge; The T1 strain gauge and the C1 strain gauge are symmetrically arranged in the same group of strain beams (3); the T2 strain gauge and the C2 strain gauge are symmetrically arranged in the same group of strain beams (3); the T3 strain gauge and the C3 strain gauge are symmetrically arranged in the same group of strain beams (3); the T4 strain gauge and the C4 strain gauge are symmetrically arranged in the same group of strain beams (3).

6. A small-range miniature tensile / compressive sensor with anti-eccentric load capability according to claim 5, characterized in that, The strain gauges T2, T1, C1, C2, T3, T4, C4, and C3 are connected in series to form a Wheatstone circuit.

7. A small-range miniature tensile / compressive sensor with anti-eccentric load capability according to claim 2, characterized in that, The strain gauge (4) is provided with sixteen strain gauges, namely T1 strain gauge, T2 strain gauge, T3 strain gauge, T4 strain gauge, T5 strain gauge, T6 strain gauge, T7 strain gauge, T8 strain gauge, C1 strain gauge, C2 strain gauge, C3 strain gauge, C4 strain gauge, C5 strain gauge, C6 strain gauge, C7 strain gauge and C8 strain gauge; The T1 strain gauge, the T2 strain gauge, the T3 strain gauge, the T4 strain gauge, the C5 strain gauge, the C6 strain gauge, the C7 strain gauge, and the C8 strain gauge are disposed on the first arched strain beam (31), with the T1 strain gauge, the T2 strain gauge, the T3 strain gauge, and the T4 strain gauge disposed on the first arched strain beam (31) near the inner ring (2) of the elastic body, and the C5 strain gauge, the C6 strain gauge, the C7 strain gauge, and the C8 strain gauge disposed on the first arched strain beam (31) near the outer ring (1) of the elastic body; The T1 strain gauge and the C5 strain gauge, the T2 strain gauge and the C6 strain gauge, the T3 strain gauge and the C7 strain gauge, and the T4 strain gauge and the C8 strain gauge are arranged on the same first arched strain beam (31); the T5 strain gauge, the T6 strain gauge, the T7 strain gauge, the T8 strain gauge, the C1 strain gauge, the C2 strain gauge, the C3 strain gauge, and the C4 strain gauge are arranged on the second arched strain beam (32); the T5 strain gauge and the C1 strain gauge, the C2 strain gauge and the T8 strain gauge are arranged on the same first arched strain beam (31); the T5 strain gauge and the C6 strain gauge, the T7 strain gauge and the C8 strain gauge, the C1 strain gauge, the C2 strain gauge, and the C8 strain gauge are arranged on the same first arched strain beam (31); the T5 strain gauge and the C6 strain gauge, the T7 strain gauge, the T8 strain gauge, the C1 strain gauge, the C2 strain gauge, the C3 strain gauge, and the C4 strain gauge are arranged on the same first arched strain beam (31); the T5 strain gauge and the C6 strain gauge, the T7 strain gauge, the T8 strain gauge, the C1 strain gauge, the C2 strain gauge, the C3 strain gauge, and the C8 strain gauge are arranged on the same first arched strain beam (31); the T1 strain gauge, the C5 strain gauge, the T6 strain gauge, the T7 strain gauge, the T8 strain gauge, the C1 strain gauge, the C2 strain gauge, the C3 strain gauge, and the C4 strain gauge are arranged on the same first arched strain beam (32); the T5 strain gauge and the C6 strain gauge, the T7 strain gauge, the T8 strain gauge, the C3 strain gauge, the C7 strain gauge, the C3 strain gauge, and the C8 strain gauge are arranged on the same first arched strain beam (31); the T1 strain gauge, the C5 strain gauge, the C6 strain gauge, the T7 strain gauge, the T8 strain gauge, the C1 strain gauge, the C2 strain gauge The strain gauges 6, C3, T7, and C4 are arranged in a group, and the grouped strain gauges are arranged on the same second arched strain beam (32). The strain gauges T5, T6, T7, and T8 are located on the second arched strain beam (32) near the outer ring (1) of the elastic body, and the strain gauges C1, C2, C3, and C4 are located on the second arched strain beam (32) near the inner ring (2) of the elastic body. Two strain gauges are provided on both the first arched strain beam (31) and the second arched strain beam (32); The T1 strain gauge and the C1 strain gauge are symmetrically arranged in the same group of strain beams (3); the T2 strain gauge and the C2 strain gauge are symmetrically arranged in the same group of strain beams (3); the T6 strain gauge and the C6 strain gauge are symmetrically arranged in the same group of strain beams (3); the T3 strain gauge and the C3 strain gauge are symmetrically arranged in the same group of strain beams (3); the T7 strain gauge and the C7 strain gauge are symmetrically arranged in the same group of strain beams (3); the T4 strain gauge and the C4 strain gauge are symmetrically arranged in the same group of strain beams (3); the T8 strain gauge and the C8 strain gauge are symmetrically arranged in the same group of strain beams (3).

8. A small-range miniature tensile / compressive sensor with anti-eccentric load capability according to claim 7, characterized in that, The strain gauges T4, T3, T2, T1, C1, C2, C3, C4, T5, T6, T7, T8, C8, C7, C6, and C5 are connected in series to form a Wheatstone circuit.

9. A small-range miniature tensile / compressive sensor with anti-eccentric load capability according to claim 1, characterized in that, Both the outer elastic ring (1) and the inner elastic ring (2) are provided with flange mounting holes for connecting the system under test.

10. A small-range miniature tensile / compressive sensor with anti-eccentric load capability according to claim 1, characterized in that, Both the outer elastic ring (1) and the inner elastic ring (2) are made of stainless steel or aluminum alloy.

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