Fixing device of surface strain gauge

Abstract

The invention provides a fixing device for a surface strainmeter. The surface strainmeter comprises a strainmeter sensor body and sensor connectors arranged at the two ends of the strainmeter sensor body respectively. The fixing device comprises a first mounting seat and a second mounting seat, and the first mounting seat and the first sensor are respectively connected with the corresponding sensor connectors; each of the first mounting seat and the second mounting seat comprises a first fixing piece, a second fixing piece and a bolt fixing piece, and a mounting channel penetrating left and right is formed in the second fixing piece; the corresponding sensor connector is inserted into the mounting channel of the corresponding mounting seat and slides left and right in the corresponding mounting channel; the bolt fixing piece penetrates through a first mounting hole which is formed in the first fixing piece and penetrates up and down and extends into the structure so that the first fixing piece can be fixed to the structure. According to the invention, the problem that the range of the surface strain gauge is shortened due to the fact that the distance between drill holes is inconsistent with the standard caused by inaccurate drilling and the sensor cannot be installed or compressed or stretched can be solved.

Description

Technical Field

[0001] The invention relates to a fixing device for a strain gauge, in particular to a fixing device for a surface strain gauge. Background Art

[0002] A surface strain gauge is a sensor used to measure the surface strain of an object. It is mainly used in the fields of engineering and scientific research to evaluate the mechanical properties of materials, the deformation behavior of structures, and the analysis of strain distribution. Especially for surface-mounted surface strain gauges on structures such as concrete, whether it is a vibrating-wire surface strain gauge, a resistive surface strain gauge, or a fiber grating surface strain gauge, it is necessary to drill a hole from the surface of a structure, such as a building, and then insert the first screw rod, inject the anchor glue, and use screws, first nuts, etc. to fix the mounting base of the surface strain gauge and the structure through bolt connection to achieve a tightening installation effect.

[0003] However, when installing the existing surface strain gauge, due to the limitation of the fixed size of the surface strain gauge, the drilling hole of the mounting seat of the surface strain gauge is usually only slightly larger than the diameter of the first screw, and the distance between the drilling holes at both ends of the two mounting seats of the surface strain gauge is fixed. However, in the actual installation process, the hole spacing after drilling is often inconsistent with the hole spacing of the drilling hole, which makes it impossible to install and need to be re-drilled, or the mounting seat needs to be stretched and compressed before installation, resulting in the initial assembly force after installation, which will shorten the range of the surface strain gauge; even if the hole spacing after drilling is completely aligned with the drilling hole of the mounting seat, it is necessary to ensure that the drilled hole position is perpendicular to the surface of the structure, so that the mounting seat and the structure can be completely fastened and installed by bolt connection. However, in the actual installation process, there is a skewed hole position after drilling, which may cause the installation to be impossible and need to be re-drilled; or it can be installed, but due to the skewed hole position, the first screw and the first nut after installation are not perpendicular to the mounting seat, and cannot be tightly fitted and fastened, which affects the installation effect and causes measurement errors. Summary of the invention

[0004] In order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide a fixing device for a surface strain gauge, which can solve the problem in the prior art that the surface strain gauge cannot be installed when the drill hole is skewed or the distance between the drill holes is inconsistent with the plan, or the surface strain gauge and the mounting seat need to be compressed or stretched, resulting in a shortened range of the surface strain gauge.

[0005] The purpose of the present invention is achieved by the following technical solutions:

[0006] A fixing device for a surface strain gauge, the surface strain gauge comprising a strain gauge sensor body and sensor connectors respectively arranged at two ends of the strain gauge sensor body; the fixing device for the surface strain gauge comprises a first mounting seat and a second mounting seat, and the first mounting seat and the second mounting seat are respectively connected to corresponding sensor connectors;

[0007] The first mounting seat and the second mounting seat each include a first fixing member, a second fixing member and a bolt fixing member, the second fixing member is provided with a mounting channel running through left and right; the corresponding sensor connector is inserted into the mounting channel of the second fixing member of the corresponding mounting seat and slides left and right in the corresponding mounting channel; the first fixing member is provided with a first mounting hole running through up and down, the bolt fixing member passes through the first mounting hole and extends into the structure to fix the first fixing member to the structure.

[0008] Further, the bolt fixing member includes a first screw rod, a first nut and a spacer which are sequentially sleeved on the outside of the first screw rod; the first fixing member is provided with a first groove, and the first mounting hole is provided in the middle of the first groove;

[0009] The bolt fixing member is located in the first groove and the bottom of the first screw rod of the bolt fixing member passes through the first mounting hole and extends into the drilled hole of the structure; the first nut is threadedly mounted on the first screw rod, and the first nut is rotated to squeeze the cushion block, so that the bottom of the cushion block fits with the groove surface of the first groove, so as to fix the first fixing member on the structure.

[0010] Furthermore, the first groove is a semicircular groove, and the bottom of the cushion block is a semicircular protrusion matching the semicircular groove.

[0011] Furthermore, a first gasket sleeved outside the first screw rod is provided between the first nut and the cushion block.

[0012] Furthermore, the first mounting hole is an elongated strip-shaped mounting hole extending in the left-right direction.

[0013] Furthermore, the first mounting seat and the second mounting seat are L-shaped fixing members; the first fixing member is a horizontal fixing member, the second fixing member is a vertical fixing member, and one end of the horizontal fixing member is fixedly connected to the bottom end of the vertical fixing member to form the L-shaped fixing member; the horizontal fixing member and the vertical fixing member are designed as an integral whole.

[0014] Furthermore, a second groove running through the second fixing member is provided at the top end thereof, and the installation channel is formed by the second groove; two side edges of the second groove respectively extend outward in a direction away from the second fixing member to form a first protrusion and a second protrusion that are spaced apart; the first protrusion and the second protrusion are clamped to fasten the first protrusion and the second protrusion, thereby fixing the corresponding sensor connector located in the second groove.

[0015] Furthermore, the first protrusion and the second protrusion are both provided with a second mounting hole; the first protrusion and the second protrusion are clamped by sequentially passing a clamping bolt through the second mounting hole of the first protrusion and the second mounting hole of the second protrusion.

[0016] Furthermore, the clamping bolt includes a second nut, a third nut and a second screw rod, wherein the second screw rod passes through the first protrusion and the second protrusion in sequence; the second nut and the third nut are respectively threadedly installed on both ends of the second screw rod, so as to clamp and fix the first protrusion and the second protrusion by rotating the second nut and the third nut in reverse.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention adopts the method of setting a mounting channel and a longer sensor connector to adjust the clamping position of the sensor connector so that the distance between the two mounting seats can adapt to the actual distance between the drilled holes formed after drilling, and automatically compensates for the inconsistency and misalignment of the drilled hole spacing. There is no need to re-drill, and the surface strain gauge itself will not be compressed or stretched, so that the surface strain gauge itself will not have initial assembly stress, thereby ensuring the accuracy of the range of the surface strain gauge. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of a fixing device for a surface strain gauge and an installation diagram of the surface strain gauge provided by the present invention;

[0020] Figure 2 for Figure 1 An exploded schematic diagram of a mounting base in a fixture for a surface strain gauge;

[0021] Figure 3 for Figure 1 One of the structural diagrams of a mounting base in a fixture for a surface strain gauge;

[0022] Figure 4 for Figure 1 A three-dimensional cross-sectional view of a fixing device of a surface strain gauge, a surface strain gauge and a mounting structure of a structure;

[0023] Figure 5 When the drill hole of the structure is skewed, Figure 1 A three-dimensional cross-sectional view of a mounting structure of a mounting seat and a structure in a fixing device of a surface strain gauge;

[0024] Figure 6 It is a three-dimensional cross-sectional view of a conventional mounting base and a mounting structure of a structure when the drill hole of the structure is skewed.

[0025] In the figure: 1. first mounting seat; 2. second mounting seat; 3. sensor body; 4. structure; 5. first sensor connector; 6. second sensor connector; 7. connecting rod; 11. first fixing member; 12. second fixing member; 13. first screw; 14. first nut; 15. first gasket; 16. block; 17. first groove; 21. first protrusion; 22. second protrusion; 23. clamping bolt; 231. second screw; 232. second nut; 24. second groove; 25. second mounting hole. DETAILED DESCRIPTION

[0026] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0027] like Figure 1 - Figure 6 As shown, a fixing device for a surface strain gauge comprises two mounting seats, which are respectively arranged at two ends of the surface strain gauge to fix the surface strain gauge.

[0028] Specifically, for the convenience of description, in this embodiment, the two mounting seats are respectively recorded as: a first mounting seat 1 and a second mounting seat 2. The first mounting seat 1 and the second mounting seat 2 are respectively mounted on the left and right ends of the surface strain gauge. In this embodiment, left and right refer to directions parallel to the structure 4, and up and down refer to directions perpendicular to the structure 4.

[0029] Generally speaking, the surface strain gauge includes a sensor body 3, a connecting rod 7 and two sensor connectors. For the convenience of description, the two sensor connectors are respectively recorded as: a first sensor connector 5 and a second sensor connector 6. One end of the first sensor connector 5 is fixedly connected to the sensor body 3 through the corresponding connecting rod 7, and the other end is connected to the first mounting seat 1. One end of the second sensor connector 6 is fixedly connected to the sensor body 3 through the connecting rod 7, and the other end is connected to the second mounting seat 2.

[0030] More specifically, the first mounting seat 1 and the second mounting seat 2 in this embodiment have the same structure, and both include a first fixing member 11, a second fixing member 12 and a bolt fixing member.

[0031] The second fixing member 12 is provided with a mounting channel that runs through left and right. The first sensor connector 5 is inserted into the mounting channel of the second fixing member 12 of the first mounting seat 1 and slides left and right in the corresponding mounting channel, and the second sensor connector 6 is inserted into the mounting channel of the second fixing member 12 of the second mounting seat 2 and slides left and right in the corresponding mounting channel. The left and right direction refers to the direction parallel to the connecting rod 7 of the sensor body 3 in this embodiment.

[0032] The present invention sets the connection structure between each mounting seat and the corresponding sensor connector as an adjustable structure, and can appropriately adjust the distance between the first mounting seat 1 and the second mounting seat 2 to fit the distance between the two boreholes on the structure 4 during actual installation, so as to avoid the situation that the distance between the two boreholes on the structure 4 does not match the specified distance due to external or human factors, and the surface strain gauge cannot be installed or needs to be stretched or compressed before installation. When it cannot be installed, it is necessary to drill the structure 4 again; when the surface strain gauge is stretched or compressed for installation, the surface strain gauge will have initial assembly stress and shorten the range of the surface strain gauge. Therefore, the mounting seat of the present invention is used to set the connection between the sensor connector and the corresponding second fixing member 12 to be adjustable, so that the distance between the surface strain gauge and the two mounting seats can be adjusted to fit the actual distance between the two boreholes, so that even if the distance between the boreholes deviates from the actual distance, it will not be impossible to install, and there is no need to stretch or compress the surface strain gauge, which solves the problem of inaccurate measurement results caused by the need to drill again and the initial assembly stress caused by compressing or stretching the surface strain gauge.

[0033] Preferably, the first fixing member 11 is provided with a first mounting hole that penetrates vertically, and the bolt fixing member passes through the first mounting hole and extends into the drilled hole of the structure 4 to fix the first fixing member 11 to the structure 4. The drilled hole refers to a drilled hole formed after drilling the structure 4. The up and down direction refers to a direction perpendicular to the horizontal plane of the top surface of the structure 4.

[0034] More preferably, if Figure 2 and Figure 4 As shown, the bolt fixing member includes a first screw rod 13, a first nut 14 and a cushion block 16 which are sequentially sleeved on the outside of the first screw rod 13. Among them, a first groove 17 is provided on the first fixing member 11, and a first mounting hole is provided in the middle of the first groove 17. The bolt fixing member is located in the first groove 17, and the bottom of the first screw rod 13 of the bolt fixing member passes through the first mounting hole and extends into the drilled hole of the structure 4. The first nut 14 is threadedly mounted on the first screw rod 13. The cushion block 16 is arranged below the first nut 14. The cushion block 16 is squeezed by rotating the first nut 14, so that the bottom of the cushion block 16 is fitted with the groove surface of the first groove 17, so that the first fixing member 11 is fixed to the structure 4.

[0035] More preferably, the first groove 17 is a semicircular groove, and the bottom of the cushion block 16 is a semicircular protrusion. In this way, when the cushion block 16 is squeezed by the knob first nut 14, the bottom of the cushion block 16 can be completely fitted with the groove surface of the first groove 17, ensuring that when the drilling hole of the structure 4 is skewed, the bottom of the cushion block 16 and the groove surface of the first groove 17 are still completely fitted, that is, ensuring that the first screw 13 and the structure 4 and the first fixing member 11 can be completely fitted, avoiding the problem of the first screw 13 not being fixed tightly.

[0036] Specifically, Figure 6 As shown, under normal circumstances, if there is no first groove 17 on the first fixing member 11: if the drill hole is crooked, when the first screw 13 is inserted into the drill hole, the first screw 13 and the bottom plane of the first fixing member 11 cannot be completely perpendicular, and the first screw 13 cannot be completely fitted with the first fixing member 11, and an angle is generated between the first screw 13 and the top plane of the first fixing member 11, and the first screw 13 cannot be completely fixed.

[0037] On the contrary, Figure 5 As shown, through this embodiment, a semicircular groove is set on the first fixing member 11 of the mounting seat, and a cushion block 16 is set below the first nut 14. The bottom of the cushion block 16 is a semicircular protrusion. When the drilling hole is skewed: at this time, the bottom plane of the first fixing member 11 is no longer parallel to the cushion block 16 and the first nut 14, and the bottom plane of the first fixing member 11 is not perpendicular to the first screw rod 13 and the drilling hole. In this way, during the rotation of the first nut 14, the cushion block 16 will slide along the interface formed by the groove surface of the first groove 17 of the first fixing member 11 and the bottom convex surface of the cushion block 16-the spherical arc, and during the sliding process, the bottom of the cushion block 16 is completely in contact with the groove surface of the first groove 17 of the first fixing member 11; at the same time, the bottom plane of the first fixing member 11 will also slide in contact with the surface of the structure 4. That is, during the rotation of the first nut 14, the bottom plane of the first fixing member 11 always fits against the structure 4, and the first fixing member 11, the spacer 16 and the first nut 14 fit tightly together. In this way, the first fixing member 11 can be completely and firmly fitted to the surface of the structure 4 by the assembly action between the first nut 14, the spacer 16 and the first screw rod 13, thereby achieving the tightening of the first fixing member 11.

[0038] That is, the present invention adopts a basin-type mounting seat with a groove to fix the surface strain gauge, which can solve the problem that the screw is not tightly fixed when the drilled hole of the structure 4 is skewed; at the same time, an installation structure of a sensor connector with an adjustable position is adopted to solve the problem of non-standard distances between the drilled holes of the structure 4 to ensure the tight installation of the surface strain gauge, and at the same time, it can also avoid stretching or compressing the surface strain gauge so that the surface strain gauge has initial assembly stress to shorten the range of the surface strain gauge.

[0039] Furthermore, a first gasket 15 is provided between the first nut 14 and the cushion block 16, and the first gasket 15 is sleeved on the outside of the first screw rod 13. The first gasket 15 is provided to increase the friction force and provide additional support to maintain the stability and safety of the bolt fastener, thereby preventing the bolt from loosening. The first gasket 15 is provided to increase the friction force of the first nut 14, thereby providing additional support to maintain the stability and safety of the bolt fastener, thereby preventing the bolt from loosening, and ensuring that the structure 4, the mounting seat and the sensor connector are always in a tightened state without relative slippage or dislocation.

[0040] Preferably, the first mounting hole is an elongated mounting hole to avoid the problem that the first mounting hole of the first fixing member 11 cannot be aligned with the drilled hole due to inaccurate hole diameter. By providing an elongated mounting hole, the mounting position of the first fixing member 11 can be properly adjusted to achieve alignment with the drilled hole.

[0041] More preferably, the first mounting seat 1 and the second mounting seat 2 in the present invention are both L-shaped mounting seats. Specifically, the first fixing member 11 is a horizontal fixing member, the second fixing member 12 is a vertical fixing member, and one end of the horizontal fixing member is fixedly connected to the bottom end of the vertical fixing member to form an L-shaped fixing member. More specifically, the horizontal fixing member and the vertical fixing member are designed as one piece.

[0042] Furthermore, if Figure 3 and Figure 1 As shown, the top of the second fixing member 12 is provided with a second long groove 24 that runs through the left and right sides, and a mounting channel is formed by the second groove 24. The two sides of the second groove 24 extend outward in a direction away from the second fixing member 12 to form a first protrusion 21 and a second protrusion 22 that are arranged at intervals. The first protrusion 21 and the second protrusion 22 are clamped to fasten the first protrusion 21 and the second protrusion 22, thereby fixing the corresponding sensor connector located in the second groove 24.

[0043] More preferably, the first protrusion 21 and the second protrusion 22 are both provided with a second mounting hole 25. The first protrusion 21 and the second protrusion 22 are clamped by passing the clamping bolt 23 through the second mounting hole 25 of the first protrusion 21 and the second mounting hole 25 of the second protrusion 22 in sequence. Specifically, the clamping bolt 23 includes a second nut 232, a third nut and a second screw rod 231, wherein the second screw rod 231 passes through the first protrusion 21 and the second protrusion 22 in sequence. The second nut 232 and the third nut are respectively threadedly installed on both ends of the second screw rod 231, so as to clamp and fix the first protrusion 21 and the second protrusion 22 by rotating the second nut 232 and the third nut in reverse.

[0044] Specifically, the present invention also provides a fixed installation process of the surface strain gauge, which is as follows:

[0045] Step 1: Mark the positions of the holes on the structure 4 to be measured according to the direction of the strain force to be measured, the size of the holes to be drilled in the structure 4, and the distance between the two holes.

[0046] Step 2: Drill the structure 4 according to the marked positions of the holes to form two holes. At the same time, try to ensure that the holes are drilled vertically at the marked positions during the drilling process. For example, it is recommended that the inclination angle of the drilling be controlled within 60°.

[0047] Step 3: After the drilling is completed, clean each borehole and fill it with anchoring glue, and insert the first screw 13 into the two boreholes filled with anchoring glue respectively.

[0048] Step 4. After the anchor glue in each drilled hole solidifies, place each mounting seat on the structure 4, and ensure that the first screw 13 of each mounting seat is located in the first mounting hole of the first fixing member 11 of the mounting seat; then sequentially sleeve the corresponding pad 16, the first gasket 15 and the first nut 14 on the first screw 13; then gradually increase the force to tighten the corresponding first nut 14 and in the process of tightening the corresponding first nut 14, it is necessary to adjust the orientation of the first fixing member 11 of each mounting seat to ensure that after the corresponding first nut 14 is finally tightened, the second fixing members 12 of the two mounting seats remain parallel.

[0049] There are two situations in the process of tightening the corresponding first nut 14:

[0050] First, when the drill hole is not skewed, that is, the central axis of the drill hole is completely perpendicular to the plane of the structure 4 (the plane of the structure 4 refers to the top horizontal plane of the structure 4): the first screw rod 13 inserted into the drill hole is perpendicular to the plane of the structure 4, and at this time, the bottom plane of the first fixing member 11 is completely parallel to the pad 16, the first gasket 15, and the first nut 14 of the bolt fixing member, and at the same time, the bottom plane of the first fixing member 11 is completely perpendicular to the corresponding first screw rod 13 and the drill hole without any sliding, such as Figure 4 shown.

[0051] Secondly, when the drill hole is skewed, that is, the central axis of the drill hole is not perpendicular to the plane of the structure 4: the first screw rod 13 inserted into the drill hole is not perpendicular to the plane of the structure 4, and at this time, the bottom plane of the first fixing member 11 is no longer parallel to the pad 16, the first gasket 15, and the first nut 14 of the bolt fixing member, and the bottom plane of the first fixing member 11 is not perpendicular to the corresponding first screw rod 13 and the drill hole; in the process of tightening the corresponding first nut 14, the bottom of the corresponding pad 16 will slide along the interface - the spherical arc - between the groove surface of the corresponding first fixing member 11 and the bottom convex surface of the corresponding pad 16 according to the skewness of the corresponding first screw rod 13 or the drill hole, and the bottom of the corresponding pad 16 will still be completely in contact with the groove surface of the corresponding first fixing member 11 during the sliding process; at the same time, the bottom plane of the first fixing member 11 of the corresponding mounting seat will also slide in contact with the plane of the structure 4 and always be in contact with the plane of the structure 4, such as Figure 5 shown.

[0052] Obviously, in this embodiment, compared with the usual case, Figure 5 For the structure shown in FIG. 1 , after tightening the corresponding first nut 14, the bottom plane of the first fixing member 11 of each mounting seat of the present invention is still in contact with the plane of the structure 4, and the mounting seat, the cushion block 16, the first gasket 15, and the first nut 14 are still tightly fitted together. The assembly of the gasket, the first nut 14, and the corresponding first screw rod 13 can tightly fit and fix the corresponding mounting seat to the structure 4. Figure 2 In terms of the structure, the fixing between the mounting seat and the structure 4 is more secure.

[0053] Step 5, after the two mounting seats are installed and fixed, the first sensor connector 5 and the second sensor connector 6 are respectively passed through the mounting channels (i.e., the second groove 24) of the second fixing member 12 of the corresponding mounting seat, and then the first protrusion 21 and the second protrusion 22 of the corresponding mounting seat are fastened by the clamping bolt 23 to fix the corresponding sensor connector in the corresponding mounting channel to fix the surface strain gauge; at this time, since the bottom planes of the first fixing members 11 of the two mounting seats are parallel to the structure 4, and the second fixing members 12 of the two mounting seats are parallel, the sensor body 3 is also completely parallel to the structure 4.

[0054] At the same time, when the distance between the two drilled holes formed by the actual drilling is inconsistent with the planned distance, resulting in the distance between the two mounting seats being inconsistent with the planned distance and being misaligned, and if the drilling is skewed during the installation of the mounting seat, resulting in the distance between the two mounting seats being inconsistent with the planned distance and being misaligned, the longer sensor connector designed by the present invention is adopted, and combined with the structure that the sensor connector can slide in the installation channel, the clamping position of each sensor connector in the installation channel is adjusted according to the actual distance between the two mounting seats. Specifically, the sensor connectors at both ends are moved to appropriate positions and then clamped and fixed. In this way, there is no need to re-drill as in the prior art, and there is no need to stretch or compress the mounting seat, so that the surface strain gauge will not have initial assembly stress, thereby ensuring the accuracy of the range of the surface strain gauge.

[0055] Preferably, a second gasket is provided between the second nut 232 and the first protrusion 21, and between the third nut and the second protrusion 22. The second gasket is provided to increase friction and provide additional support to maintain the stability and safety of the bolt connection, thereby preventing the bolt from loosening, thereby ensuring that the structure 4, the mounting seat and the sensor connector are always in a fastened state without relative slippage, thereby ensuring that the surface strain gauge is installed firmly.

[0056] The present invention adopts a fixing method between the sensor connector and the mounting seat, and adjusts the distance between the two mounting seats by adjusting the fixed position of the sensor connector, so as to automatically compensate for the inconsistent and misaligned hole spacing of the matching drilled holes. In this way, there is no need to re-drill holes or stretch or compress the mounting seat / sensor connector, and the surface strain gauge can be installed normally, while the standard range of the surface strain gauge can be guaranteed.

[0057] At the same time, the present invention also realizes the installation between the first screw and the first fixing member and the structure by setting a semicircular groove on the first fixing member of each mounting seat and cooperating with a semicircular raised pad, so as to ensure that in the case of skewed drilling, the first screw, the pad and the first fixing member can still be perfectly fastened and fit, and the first fixing member and the structure can be perfectly fit, so as to ensure the installation effect and accurate measurement, and there is no need to drill holes again. In addition, a gasket is added between the corresponding nut and the screw to increase friction and provide additional support to maintain the stability and safety of the bolt, so as to prevent the bolt from loosening, thereby ensuring that the structure, the mounting seat and the sensor body are always in a fastened state without relative slippage.

[0058] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A fixing device for a surface strain gauge, the surface strain gauge comprising a strain gauge sensor body and sensor connectors respectively arranged at two ends of the strain gauge sensor body; characterized in that: The fixing device of the surface strain gauge comprises a first mounting seat and a second mounting seat, and the first mounting seat and the second mounting seat are respectively connected to corresponding sensor connectors; The first mounting seat and the second mounting seat each include a first fixing member, a second fixing member and a bolt fixing member, the second fixing member is provided with a mounting channel running through left and right; the corresponding sensor connector is inserted into the mounting channel of the second fixing member of the corresponding mounting seat and slides left and right in the corresponding mounting channel; the first fixing member is provided with a first mounting hole running through up and down, the bolt fixing member passes through the first mounting hole and extends into the structure to fix the first fixing member to the structure.

2. The fixing device for a surface strain gauge according to claim 1, characterized in that: The bolt fixing member includes a first screw rod, a first nut and a spacer which are sequentially sleeved on the outside of the first screw rod; the first fixing member is provided with a first groove, and the middle of the first groove is provided with the first mounting hole; The bolt fixing member is located in the first groove and the bottom of the first screw rod of the bolt fixing member passes through the first mounting hole and extends into the drilled hole of the structure; the first nut is threadedly mounted on the first screw rod, and the first nut is rotated to squeeze the cushion block, so that the bottom of the cushion block fits with the groove surface of the first groove, so as to fix the first fixing member on the structure.

3. The fixing device for a surface strain gauge according to claim 1, characterized in that: The first groove is a semicircular groove, and the bottom of the pad is a semicircular protrusion matching the semicircular groove.

4. The fixing device for a surface strain gauge according to claim 1, characterized in that: A first gasket is provided between the first nut and the cushion block and is sleeved outside the first screw rod.

5. The fixing device for a surface strain gauge according to claim 1, characterized in that: The first mounting hole is a long strip mounting hole in the left-right direction.

6. The fixing device for a surface strain gauge according to claim 1, characterized in that: The first mounting seat and the second mounting seat are L-shaped fixing members; the first fixing member is a horizontal fixing member, the second fixing member is a vertical fixing member, and one end of the horizontal fixing member is fixedly connected to the bottom end of the vertical fixing member to form the L-shaped fixing member; the horizontal fixing member and the vertical fixing member are designed as an integral whole.

7. The fixing device for a surface strain gauge according to claim 1, characterized in that: A second groove running through the second fixing member is provided at the top end thereof, and the installation channel is formed by the second groove; the two side edges of the second groove extend outwardly in a direction away from the second fixing member to form a first protrusion and a second protrusion that are arranged at intervals; the first protrusion and the second protrusion are clamped to fasten the first protrusion and the second protrusion, thereby fixing the corresponding sensor connector located in the second groove.

8. The fixing device for a surface strain gauge according to claim 7, characterized in that: The first protrusion and the second protrusion are both provided with a second mounting hole; the first protrusion and the second protrusion are clamped by passing a clamping bolt through the second mounting hole of the first protrusion and the second mounting hole of the second protrusion in sequence.

9. The fixing device for a surface strain gauge according to claim 8, characterized in that: The clamping bolt includes a second nut, a third nut and a second screw rod, wherein the second screw rod passes through the first protrusion and the second protrusion in sequence; the second nut and the third nut are respectively threadedly installed on both ends of the second screw rod, so as to clamp and fix the first protrusion and the second protrusion by rotating the second nut and the third nut in reverse.

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