Modular multipurpose strain measurement sensor

Abstract

A kind of multi-purpose strain measurement sensor of assembly, upper end cover is equipped in the upper end in shell, lower end cover is equipped in the lower end in shell, left spring leaf and right spring leaf are equipped in shell, upper pad and lower pad are equipped between left spring leaf and right spring leaf, the upper part of left spring leaf and right spring leaf is equipped in the fixed end clamp block under upper end cover, strain gauge is equipped on left spring leaf and right spring leaf, one end of auxiliary connecting rod inserted into shell and sleeved with limit ring is equipped on left spring leaf and right spring leaf, the other end of auxiliary connecting rod is equipped with left connecting rod connected with right support, left support is equipped on lower end cover, rigid-flexible coupling mechanism is equipped between left connecting rod and right support, left connecting rod and rigid-flexible coupling mechanism constitute rigid-flexible connecting rod.The left spring leaf and right spring leaf are deformed by rigid-flexible connecting rod, the size of left spring leaf and right spring leaf deformation is sensed by strain gauge, and is output to strain gauge through output lead, both small strain of structure and large strain of structure can be measured.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of measuring relative displacement, and particularly relates to a multi-purpose strain measurement sensor with assembly. BACKGROUND

[0002] In the engineering quality detection, service life evaluation, disease cause analysis and new structure type test of bridges and various building structures, strain is usually one of the main physical quantities to be observed. Currently, there are mainly two kinds of concrete strain measurement gauges for measuring the strain of concrete buildings. One is a strain gauge, which is directly pasted on the detected part of the structure. The pasting, welding and sealing of the strain gauge are usually performed at a height of several meters or even tens of meters, which is difficult and has low quality and efficiency. Moreover, the measurement value is greatly affected by the environmental temperature and humidity, and the measurement data has low reliability. The other is a bow-shaped strain gauge, which mainly comprises a bow-shaped elastic device sheet with a strain gauge pasted thereon. The bow-shaped elastic device sheet is pressed by a special metal mold, and has complex processing and high production cost. The bow-shaped elastic device sheet has large rigidity, which affects the strain of the surface of the sensing component, and the calibrated data is inaccurate and unstable. Especially, the two ends of the strain gauge are pasted on the supports, and it is impossible to simultaneously remove the two supports when the strain gauge is removed, so that the sensitive part of the strain gauge is subjected to large stress, the strain gauge is easily damaged, the correction coefficient changes, and the measurement result has large error.

[0003] The Chinese patent "Double-cantilever concrete structure strain measurement gauge" with the application number 200320109969.X solves the above problems, but the strain gauge cannot measure large strain, and cannot measure the strain when the component produces plastic deformation or the reinforced concrete component works with cracks. SUMMARY

[0004] The present application aims to overcome the defects of the prior art, and provides a multi-purpose strain measurement sensor with assembly, which can measure both small strain and large strain of a concrete component.

[0005] The technical solution adopted to solve the above-mentioned technical problems is as follows: an assemblable multi-purpose strain measurement sensor, including a housing, an upper end cover at the upper end and a lower end cover at the lower end of the housing, a left spring plate and a right spring plate inside the housing, an upper pad and a lower pad between the left spring plate and the right spring plate, the upper parts of the left spring plate and the right spring plate are set in a fixed end clamping block under the upper end cover, strain gauges connected to output wires are set on the left spring plate and the right spring plate, one end of an auxiliary connecting rod inserted into the housing and fitted with a limit ring is set on the left spring plate and the right spring plate, and the other end of the auxiliary connecting rod is set as a left connecting rod connected to the right support, a left support is set on the lower end cover, and a rigid-flexible dual-purpose connecting mechanism is set between the left connecting rod and the right support, the left connecting rod and the rigid-flexible dual-purpose connecting mechanism constitute a rigid-flexible dual-purpose connecting rod.

[0006] Preferably, the rigid-flexible dual-purpose connection mechanism of the present invention includes a sleeve, with a left connecting rod connected to one end of the sleeve and a right connecting rod provided at the other end. The other end of the right connecting rod is provided on a right support. A fixing adhesive layer is provided between the sleeve and the left connecting rod, and an elastic device is provided between the left connecting rod and the right connecting rod.

[0007] Preferably, the working length of the rigid-flexible connecting rod (36) is 0.008m to 1m.

[0008] Preferably, both the left and right connecting rods are made of indium steel wire.

[0009] Preferably, the left and right connecting rods have the same length and diameter.

[0010] Preferably, the diameter of the left connecting rod is 2.5 to 6 mm, and the diameter of the right connecting rod is 2.5 to 6 mm.

[0011] Preferably, the right connecting rod is provided with scale values.

[0012] Preferably, the elastic device is a spring.

[0013] Preferably, one end of the spring passes through the left connecting rod and is fixedly connected to the left connecting rod with epoxy resin, and the other end passes through the right connecting rod and is fixedly connected to the right connecting rod with epoxy resin.

[0014] Preferably, the spring stiffness is 1.22 mm / N to 0.42 mm / N.

[0015] This invention employs a rigid-flexible dual-purpose connecting mechanism to deform the left and right spring plates. Strain gauges bonded to the left and right spring plates sense the magnitude of their deformation and output the data to a strain gauge via an output wire. By using calibration coefficients, the strain value of the measured part of the concrete component is determined. This allows the assemblable multi-purpose strain measurement sensor to measure both small and large strains of a structure, expanding the sensor's application range. This invention is simple in structure, easy to use, and low in cost. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a structural schematic diagram of one embodiment of the present application;

[0017] Figure 2 is a calibration principle schematic diagram of the present application;

[0018] Figure 3 is a displacement-strain curve diagram of Table 1;

[0019] Figure 4 is a displacement-strain curve diagram of Table 2;

[0020] Figure 5 is a displacement-strain curve diagram of Table 3;

[0021] 1 - shell; 2 - upper end cover; 3 - left spring; 4 - output lead; 5 - upper pad; 6 - upper strain gauge; 7 - fixed end clamp block; 8 - right spring piece; 9 - lower strain gauge; 10 - auxiliary connecting rod; 11 - limit ring; 12 - left connecting rod; 13 - sleeve; 14 - fixed adhesive layer; 15 - spring; 16 - fixed screw; 17 - right connecting rod; 18 - right support; 19 - lower end cover; 20 - lower pad; 21 - left support; 22 - nut; 31 - data acquisition instrument; 32 - limit screw; 34 - height adjustment pad; 35 - dial indicator calibrator base; 36 - rigid-flexible connecting rod; 37 - connecting sleeve; 38 - calibrator probe; 39 - probe moving mechanism. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the present application more clear and understandable, the present application is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application. The drawings are only used for illustrative explanation, and the representation is only a schematic diagram, not a physical diagram, and cannot be understood as a limitation of the present patent. In order to better illustrate the specific embodiments of the present application, some components in the drawings are enlarged or reduced, and do not represent the actual product size. It is understandable for those skilled in the art that some known structures and their descriptions in the drawings can be omitted. In addition, it should be noted that, in order to facilitate description, only part of the structures of the present application are shown in the drawings, not all the structures. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0023] As Figure 1As shown, the assembled multipurpose strain measurement sensor of the embodiment comprises a shell 1, an upper end cover 2, a left spring piece 3, an output lead 4, an upper pad 5, an upper strain gauge 6, a fixed end clamp block 7, a right spring piece 8, a lower strain gauge 9, an auxiliary connecting rod 10, a limiting ring 11, a left connecting rod 12, a sleeve 13, a fixed adhesive layer 14, a spring 15, a fixed screw 16, a right connecting rod 17, a right support 18, a lower end cover 19, a lower pad 20, a left support 21, a nut 22, wherein the sleeve 13, the fixed adhesive layer 14, the spring 15, the fixed screw 16, and the right connecting rod 17 constitute a rigid-flexible coupling mechanism.

[0024] The upper end of the shell 1 is provided with the upper end cover 2, and the lower end is provided with the lower end cover 19. The outer end surface of the lower end cover 19 is threadedly coupled with the left support 21. One side of the center line of symmetry in the shell 1 is provided with the left spring piece 3, and the other side is provided with the right spring piece 8. The left spring piece 3 and the right spring piece 8 are used to sense the relative displacement of the concrete member and generate deformation. The upper end of the left spring piece 3 and the right spring piece 8 is provided with the upper pad 5, and the lower end is provided with the lower pad 20. The upper part of the left spring piece 3 and the right spring piece 8 is inserted into and fixed in the fixed end clamp block 7. The fixed end clamp block 7 is arranged at the lower part of the upper end cover 2. The thickness of the left spring piece 3 and the right spring piece 8 is 0.6 mm. The length of the left spring piece 3 and the right spring piece 8 is 60 mm. The distance between the left spring piece 3 and the right spring piece 8 is 5 mm. By changing the thickness or the length of the left spring piece 3 and the right spring piece 8, the output sensitivity and the strain measurement range of the present application can be easily adjusted, and concrete strain measurement gauges with various resolutions can be manufactured. The upper strain gauge 6 is bonded to the outer side surface of the left spring piece 3, and the upper strain gauge 6 is bonded to the outer side surface of the right spring piece 8. The lower strain gauge 9 is bonded to the outer side surface of the left spring piece 3, and the lower strain gauge 9 is bonded to the outer side surface of the right spring piece 8. The upper strain gauge 6 and the lower strain gauge 9 can also be bonded to the inner side surface of the left spring piece 3 and the right spring piece 8. The upper strain gauge 6 and the lower strain gauge 9 are connected to the output lead 4. The upper strain gauge 6 and the lower strain gauge 9 output the deformation of the left spring piece 3 and the right spring piece 8 through the output lead 4. The lower part of the left spring piece 3 and the right spring piece 8 in the shell 1 is threadedly coupled with the auxiliary connecting rod 10. The right end of the auxiliary connecting rod 10 is internally threaded. The left end of the auxiliary connecting rod 10 is fixed to the lower part of the left spring piece 3 and the right spring piece 8 by the nut 22. The right end of the auxiliary connecting rod 10 protrudes out of the right side surface of the shell 1. The limiting ring 11 is sleeved on the right side of the auxiliary connecting rod 10. The limiting ring 11 is used to limit the right movement of the left spring piece 3 and the right spring piece 8 within a certain range. The right end of the auxiliary connecting rod 10 is threadedly fixed to one end of the left connecting rod 12. The other end of the left connecting rod 12 is provided with a rigid-flexible coupling mechanism. The left connecting rod 12 and the rigid-flexible coupling mechanism constitute a rigid-flexible connecting rod 36.

[0025] The rigid-flexible coupling mechanism of the embodiment comprises a sleeve 13, one end of which is sleeved on the left connecting rod 12, and the sleeve 13 is adhered to the left connecting rod 12, and a fixed adhesive layer 14 is formed after the adhesive solidifies. The other end of the sleeve 13 is fixedly connected to the right connecting rod 17 by a fixing screw 16, and the right connecting rod 17 is fixed to the right support 18 by a screw (not limited to a screw, other fixing methods can also be selected). The sleeve 13 connects the left connecting rod 12 and the right connecting rod 17 into one body, becoming a rigid connecting rod. An elastic device is arranged between the left connecting rod 12 and the right connecting rod 17. The elastic device of the embodiment is a spring 15, and other elastic devices can also be used. When the fixing screw 16 connecting the sleeve 13 and the right connecting rod 17 is loosened, the spring 15 connects the left connecting rod 12 and the right connecting rod 17 into one body, becoming a flexible connecting rod. The rigid-flexible connecting rod can make the assembled multi-purpose strain measurement sensor not only measure small strain of a structure (under normal working conditions of the concrete structure), but also measure large strain of the concrete structure (under cracking conditions of the concrete structure), thereby expanding the application range of the sensor. When the left support 21 and the right support 18 are used to measure the strain of a building component, the left support 21 and the right support 18 are adhered to the measured concrete component by an adhesive. When the surface of the concrete component produces tensile or compressive deformation, the left support 21 and the right support 18 produce relative displacement. Through the rigid-flexible connecting rod, the left spring piece 3 and the right spring piece 8 are deformed. The upper strain gauge 6 and the lower strain gauge 9 adhered to the outer side of the left spring piece 3 and the right spring piece 8 sense the deformation size of the left spring piece 3 and the right spring piece 8, and convert it into an electric signal, which is output to a strain gauge (or a data acquisition instrument) through an output lead 4. Through a calibration coefficient, the strain value of the measured part of the concrete component can be measured.

[0026] The shell 1 can be made of stainless steel material, the working length of the rigid-flexible rod 36 is determined according to the measured distance, which can be 0.008m to 1m, which can exceed 1m, which can be 0.008m, 0.01m, 0.02m, 0.03m, 0.04m, 0.05m, 0.06m, 0.07m, 0.08m, 0.09m, 0.10m, 0.15m, 0.20m, 0.25m, 0.30m, 0.35m, 0.40m, 0.45m, 0.50m, 0.50m, 0.55m, 0.60m, 0.65m, 0.70m, 0.75m, 0.80m, 0.85m, 0.90m, 0.95m, 1m, which can exceed 1m, considering reducing the influence of temperature, the left connecting rod 12 and the right connecting rod 17 are preferably made of invar steel wire, based on the firmness and durability, sensitivity and cost of the left connecting rod 12 and the right connecting rod 17, the diameter of the left connecting rod 12 is from 2.5mm to 6mm, which can be 2.5mm, 3mm, 4mm, 5mm, 6mm, the diameter of the right connecting rod 17 is from 2.5mm to 6mm, which can be 2.5mm, 3mm, 4mm, 5mm, 6mm, for easy processing, the diameter and length of the left connecting rod 12 and the right connecting rod 17 are the same, the left connecting rod 12, the spring, the sleeve 13, the right connecting rod 17, constitute a rigid-flexible rod, move the right support 18 along the right connecting rod 17, control the distance between the connection of the left connecting rod 12 and the limiting ring 11 (point A) and the connection of the right connecting rod 17 and the right support 18 (point B) (that is, the working length of the rigid-flexible rod 36); the connection mode of the left connecting rod 12, the right connecting rod 17 and the spring 15 is that one end of the spring 15 passes through the left connecting rod 12 and is fixedly connected to the left connecting rod 12 by epoxy glue, the other end passes through the right connecting rod 17 and is fixedly connected to the right connecting rod 17 by epoxy glue, the epoxy glue is convenient to solidify, has strong adhesion, good chemical stability and good dimensional stability, the inner diameter of the spring 15 is the same as the diameter of the left connecting rod 12 and the right connecting rod 17; the stiffness of the spring 15 is mainly determined by the maximum deformation required to be measured, which can be from 1.22mm / N to 0.42mm / N, in engineering practice, the minimum can be 0.05mm / N, and the maximum can be 1.5mm / N; when the stiffness of the spring 15, the thickness (diameter) of the spring 15 and the inner diameter of the spring 15 are determined, the working length of the spring 15 is determined, and the diameter of the spring 15 can be selected from 0.1mm to 0.3mm.

[0027] The left support 21 and the right support 18 of the present application are adhered to the measured concrete member. When the measured part of the concrete member cracks, the deformation will increase sharply. If a rigid connecting rod is used for the sensor at the measured part of the concrete member, the deformation transmitted to the upper strain gauge 6 and the lower strain gauge 9 adhered to the outer side of the left spring sheet 3 and the right spring sheet 8 will exceed the range of the strain gauges and the strain gauges will lose their working ability. If a flexible connecting rod is used to measure the large deformation of the structure, the spring will offset a part of the deformation by replacing the rigid connecting rod on the sensor with the flexible connecting rod with the spring 15. The size of the offset deformation can be adjusted by changing the stiffness of the spring 15. The offset deformation ensures that the deformation transmitted to the upper strain gauge 6 and the lower strain gauge 9 adhered to the outer side of the left spring sheet 3 and the right spring sheet 8 does not exceed the range of the strain gauges and the strain gauges can continue to work under the condition of large deformation. The stiffness of the original elastic structure is reduced. The deformation range of the original sensor is adjusted by changing the stiffness of the spring 15. The application range of the original sensor is expanded. In order to take into account the offset deformation of the spring, the coefficient of the sensor with the spring flexible connecting rod output to the strain gauge is recalibrated. The coefficient of the sensor with the spring flexible connecting rod output to the strain gauge is obtained. Therefore, the coefficient of the sensor output to the strain gauge is different when the rigid connecting rod is used and the flexible connecting rod with different stiffness of the spring 15 is used. The sensitivity coefficient is recalibrated. The offset deformation of the spring is taken into account. The deformation of the concrete member is accurately obtained.

[0028] Calibration test

[0029] Data acquisition instrument (also called strain gauge) Model: TDS-602 Manufacturer: TML, Japan

[0030] Micrometer tester Model: SJ3000 Manufacturer: Zhonggu, Shenzhen

[0031] As Figure 2The shown: micrometer tester (not limited to SJ3000 model of micrometer tester of Shenzhen Zhongtu, also can adopt micrometer tester produced by other manufacturers) includes tester pedestal 35, tester probe 38 and probe moving mechanism 39, tester probe 38 and probe moving mechanism 39 are connected, probe moving mechanism 39 drives tester probe 38 to move, when the calibration test is done, the left support 21 of the application is fixed on the height adjusting pad 34, the height adjusting pad 34 is fixed on the tester pedestal 35, the rigid-flexible connecting rod 36 of the application is connected with the tester probe 38 through the connecting sleeve 37 and the two limit screws 32 on the connecting sleeve 37, wherein the limit screw 32 and the sleeve 37 fix and connect the rigid-flexible connecting rod 36 and the tester probe 38, when the probe moving mechanism 39 drives the tester probe 38 to move to generate a certain displacement, the data acquisition instrument 31 (not limited to the model TDS-602 data acquisition instrument produced by Japan TML, also can adopt the data acquisition instrument or strain gauge produced by other manufacturers) connected with the application through the output lead 4 displays a certain strain value, when the tester probe 38 moves at equal intervals, a group of displacement and strain data can be obtained, and the displacement-strain curve can be obtained accordingly, and the output sensitivity coefficient value of the application can be obtained from the curve. When the spring 15 in the middle of the rigid-flexible connecting rod 36 is selected to be a spring with different axial stiffness, different displacement-strain curves can be obtained, so that different sensor output sensitivity coefficient values can be calculated.

[0032] Test one: the rigid-flexible connecting rod 36 of the application adopts 1 # rigid connecting rod, # Rigid connecting rod: axial stiffness is infinite (i.e. the sleeve 13 connects the left connecting rod 12 and the right connecting rod 17 into a rigid connecting rod)

[0033] 1 # rigid connecting rod is adopted, and the displacement curve is shown in Figure 3 .

[0034]

[0035] Table one: the calibration results of 1 # rigid connecting rod

[0036] From test one, when 1# rigid connecting rod is adopted, 0-0.1000mm relative displacement can be measured when the sensor output is 1008.6με.

[0037] Test two: the rigid-flexible connecting rod 36 of the application adopts 2 # flexible connecting rod, # Flexible connecting rod: the axial stiffness of the spring 15 in the middle of the left connecting rod 12 and the right connecting rod 17 is 0.42mm / N.

[0038] Use 2 # The calibration results of the rigid connecting rod are shown in Table 2, and its displacement curve is shown in the figure below. Figure 4 As shown.

[0039]

[0040] Table 2 uses 2 # Flexible connecting rod calibration results

[0041] As can be seen from Experiment 2, using 2 # The flexible connecting rod can measure relative displacement of 0-1.060 mm when the sensor outputs 996 με.

[0042] Experiment 3: The rigid-flexible dual-purpose connecting rod 36 of this invention adopts 3 # Flexible link, 3 # Flexible connecting rod: The spring 15 used between the left connecting rod 12 and the right connecting rod 17 has an axial stiffness of 1.22 mm / N.

[0043] Adopt 3 # The calibration results of the flexible connecting rod are shown in Table 3, and its displacement curve is shown in the figure below. Figure 5 As shown.

[0044]

[0045] Table 3 uses 3 # Flexible connecting rod calibration results

[0046] As can be seen from Experiment 3, using 3 # The flexible connecting rod can measure relative displacement of 0-3.050 mm when the sensor output is 995 με.

[0047] The calibration test data shows that the smaller the stiffness of the spring 15 between the left connecting rod 12 and the right connecting rod 17, the larger the range of relative displacement that can be measured. The length and stiffness of the spring 15 can be changed as needed. This invention uses springs 15 with different stiffnesses. Before use, the sensitivity coefficient of this invention is calibrated, and different ranges of strain in concrete structures can be measured.

[0048] The use of the rigid-flexible connecting rod 36 enables the present invention to measure both small strains (under normal working conditions) and large strains (under cracking conditions) of concrete structures, thus expanding the application range of the sensor.

[0049] In addition, the measured concrete structures have large and small, in order to adapt to different sizes of concrete structures, the working length range of the rigid-flexible connecting rod 36 is adjustable by moving the right support 18, further, the right connecting rod is provided with a scale value, and the working length of the rigid-flexible connecting rod 36 can be directly read after being adjusted by moving the right support 18, and the scale value is not needed to determine the working length of the rigid-flexible connecting rod 36 after adjustment, which is convenient for use of the present application.

[0050] The above merely describes preferred embodiments of the present application, but is not used to limit the protection scope of the present application.

Claims

1. An assembled multipurpose strain measurement sensor, comprising a shell (1), an upper end cover (2) arranged at the upper end of the shell (1), a lower end cover (19) arranged at the lower end of the shell (1), a left spring piece (3) and a right spring piece (8) arranged in the shell (1), an upper pad (5) and a lower pad (20) arranged between the left spring piece (3) and the right spring piece (8), the upper portions of the left spring piece (3) and the right spring piece (8) being arranged in a fixed end clamp block (7) below the upper end cover (2), a strain gauge connected with an output lead (4) being arranged on the left spring piece (3) and the right spring piece (8), one end of an auxiliary connecting rod (10) inserted into the shell (1) and sleeved with a limiting ring (11) being arranged on the left spring piece (3) and the right spring piece (8), the other end of the auxiliary connecting rod (10) being arranged in connection with a left connecting rod (12) of a right support (18), a left support (21) being arranged on the lower end cover (19), characterized in that: A rigid-flexible connecting mechanism is arranged between the left connecting rod (12) and the right support (18), and the left connecting rod (12) and the rigid-flexible connecting mechanism constitute a rigid-flexible connecting rod (36); the rigid-flexible connecting mechanism comprises a sleeve (13), one end of the sleeve (13) is connected with the left connecting rod (12), and the other end of the sleeve (13) is provided with a right connecting rod (17); the other end of the right connecting rod (17) is arranged on the right support (18); a fixed adhesive layer (14) is arranged between the sleeve (13) and the left connecting rod (12); and elastic devices are arranged between the left connecting rod (12) and the right connecting rod (17); the sleeve (13) connects the left connecting rod (12) and the right connecting rod (17) into one body to become a rigid connecting rod; the sleeve (13) is disconnected with the right connecting rod (17); the elastic devices connect the left connecting rod (12) and the right connecting rod (17) into one body to become a flexible connecting rod; the flexible connecting rod adopts different elastic devices with different rigidities; and the coefficient of the sensor output to the strain gauge of the flexible connecting rod with the elastic devices is recalibrated.

2. The modular multipurpose strain measurement sensor of claim 1, wherein: The working length of the rigid-flexible connecting rod (36) is 0.008m-1m.

3. The modular multipurpose strain measurement sensor of claim 2, wherein: The left connecting rod (12) and the right connecting rod (17) are both made of indium steel wire.

4. The modular multi-purpose strain measurement sensor of claim 1, wherein: The length and diameter of the left connecting rod (12) and the right connecting rod (17) are the same.

5. The modular multi-purpose strain measurement sensor of claim 1, wherein: The diameter of the left connecting rod (12) is 2.5-6mm; and the diameter of the right connecting rod (17) is 2.5-6mm.

6. The modular multi-purpose strain measurement sensor of claim 1, wherein: A scale value is arranged on the right connecting rod (17).

7. The modular multi-purpose strain measurement sensor of claim 1, wherein: The elastic device is a spring (15).

8. The modular multi-purpose strain measurement sensor of claim 7, wherein: One end of the spring (15) passes through the left connecting rod (12) and is fixedly connected to the left connecting rod (12) through epoxy adhesive; and the other end of the spring (15) passes through the right connecting rod (17) and is fixedly connected to the right connecting rod (17) through epoxy adhesive.

9. The modular multi-purpose strain measurement sensor of claim 7, wherein: The rigidity of the spring (15) is 1.22mm / N-0.42mm / N.

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