Fixing device of surface strain gauge

Abstract

The utility model 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 utility model, 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 utility model relates to the fixing device of strain gauge, especially a fixing device of surface strain gauge. BACKGROUND

[0002] Surface strain gauge is a kind of sensor for measuring the surface strain of object, and it is mainly applied in engineering and scientific research field, is used to assess the mechanical properties of material, the deformation behavior of structure and the analysis of strain distribution.Especially for the surface installation surface strain gauge of concrete and other structures, whether it is vibrating wire surface strain gauge, resistance type surface strain gauge or fiber grating type surface strain gauge, it needs to drill from the structure, such as building, then inserts first screw rod, fills into the post-installed adhesive, cooperates the use of screw, first nut etc., and is fixed by bolt connection to reach the effect of fastening installation.

[0003] However, the existing surface strain gauge is limited by the fixed size of surface strain gauge during installation, the drilling hole of the mounting seat of surface strain gauge is usually slightly larger than the diameter of the first screw rod, and the distance between the two ends of the drilling hole of the two mounting seats of surface strain gauge is fixed.But in the actual installation process, the hole distance after drilling is often inconsistent with the drilling hole distance, which leads to the need to re-drill or to stretch and compress the mounting seat before installation, resulting in the initial assembly force after installation, which in turn shortens the range of surface strain gauge;Even if the hole distance after drilling is completely aligned with the drilling hole of the mounting seat, it is also necessary to ensure that the drilled hole 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.But in the actual installation process, the drilled hole is inclined, which may lead to the need to re-drill;Or it can be installed, but due to the inclination of the hole, the first screw rod, the first nut and the mounting seat after installation are not perpendicular, cannot be tightly fitted and fastened, which affects the installation effect and leads to measurement error. UTILITY MODEL CONTENTS

[0004] In order to overcome the shortcomings of the prior art, the purpose of the utility model is to provide a fixing device for surface strain gauge, which can solve the problem that the surface strain gauge cannot be installed or needs to be compressed or stretched due to the inclination of the drilling hole or the distance between the drilling holes inconsistent with the plan, resulting in the shortening of the range of surface strain gauge.

[0005] The purpose of the utility model is realized by the following technical scheme:

[0006] The application discloses a fixing device of a surface strain gauge, which comprises a strain gauge sensor body and sensor connecting heads arranged at two ends of the strain gauge sensor body respectively; 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 connected with corresponding sensor connecting heads respectively.

[0007] The first mounting seat and the second mounting seat each comprise a first fixing member, a second fixing member and a bolt fixing member, the second fixing member is provided with a left-right penetrating mounting channel, the corresponding sensor connecting head 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 an up-down penetrating first mounting hole, and the bolt fixing member penetrates through the first mounting hole and extends into a structure to fix the first fixing member on the structure.

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

[0009] The bolt fixing member is located in the first groove, the bottom of the first screw rod of the bolt fixing member penetrates through the first mounting hole and extends into a drilled hole of the structure, the first nut is threadedly installed on the first screw rod, and the first fixing member is fixed on the structure by rotating the first nut to extrude the pad block and then making the bottom of the pad block fit the groove surface of the first groove.

[0010] Further, the first groove is a semicircular groove, and the bottom of the pad block is a semicircular protrusion matched with the semicircular groove.

[0011] Further, a first gasket is arranged outside the first screw rod between the first nut and the pad block.

[0012] Further, the first mounting hole is a left-right direction long strip-shaped mounting hole.

[0013] Further, 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, one end of the horizontal fixing member is fixedly connected with the bottom end of the vertical fixing member to form the L-shaped fixing member, and the horizontal fixing member and the vertical fixing member are integrally designed.

[0014] Further, the top end of the second fixing member is provided with a second groove penetrating left and right, and the mounting channel is formed through the second groove; the two side edges of the second groove respectively extend outward in a direction away from the second fixing member to form a first protruding part and a second protruding part arranged at intervals; the first protruding part and the second protruding part are clamped to fasten the first protruding part and the second protruding part, and then the corresponding sensor connector located in the second groove is fixed.

[0015] Further, the first protruding part and the second protruding part are both provided with a second mounting hole; a clamping screw is sequentially threaded through the second mounting hole of the first protruding part and the second mounting hole of the second protruding part to clamp the first protruding part and the second protruding part.

[0016] Further, the clamping screw comprises a second nut, a third nut and a second screw rod, wherein the second screw rod is sequentially threaded through the first protruding part and the second protruding part; the second nut and the third nut are respectively threadedly installed at two ends of the second screw rod, so as to clamp and fix the first protruding part and the second protruding part by reversely rotating the second nut and the third nut.

[0017] Compared with the prior art, the utility model has the advantages that:

[0018] The utility model discloses through setting mounting channel and longer sensor connector, can adjust the clamping position of sensor connector, so that the distance between two mounting seats can adapt to the actual distance between the drillings formed after drilling, automatically compensates and adapts the inconsistency, misalignment and the like of drilling hole distance, need not re-drill, also will not compress or stretch surface strain gauge itself, so that surface strain gauge itself will not appear initial assembly stress, guarantees the accuracy of the range of surface strain gauge. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 A surface strain gauge fixing device and a surface strain gauge mounting schematic view are provided for the utility model.

[0020] Figure 2 A surface strain gauge fixing device in the utility model is provided for the surface strain gauge fixing device in the utility model. Figure 1 An explosion schematic view of one mounting seat in the surface strain gauge fixing device is provided for the utility model.

[0021] Figure 3 A structure view of one mounting seat in the surface strain gauge fixing device is provided for the utility model. Figure 1 An explosion schematic view of one mounting seat in the surface strain gauge fixing device is provided for the utility model.

[0022] Figure 4 A surface strain gauge fixing device, a surface strain gauge and a mounting structure of a structure are provided for the utility model. Figure 1 A surface strain gauge fixing device, a surface strain gauge and a mounting structure of a structure are provided for the utility model.

[0023] Figure 5 for when the drill hole of the structure is inclined, Figure 1 a mounting seat in the fixing device of the surface strain gauge and the mounting structure of the structure;

[0024] Figure 6 for when the drill hole of the structure is inclined, a mounting seat and the mounting structure of the structure are shown in the perspective view.

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

[0026] In the following, the utility model will be further described in combination with the drawings and the specific embodiments, and it should be noted that the following described embodiments or technical features can be combined to form new embodiments without conflict.

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

[0028] Specifically, in order to facilitate the description, two mounting seats in the embodiment are respectively recorded as: the first mounting seat 1 and the second mounting seat 2, and the first mounting seat 1 and the second mounting seat 2 are respectively mounted at the left and right ends of the surface strain gauge. Among them, left and right in the embodiment refer to the direction parallel to the structure 4, and up and down refer to the direction perpendicular to the structure 4.

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

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

[0031] The second fixing member 12 is provided with a left-right penetrating mounting channel. The first sensor connecting head 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 mounting channel. The second sensor connecting head 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 mounting channel. The left-right direction refers to the direction parallel to the connecting rod 7 of the sensor body 3 in the embodiment.

[0032] When the connecting structure of each mounting seat and the corresponding sensor connecting head is set as an adjustable structure, the distance between the first mounting seat 1 and the second mounting seat 2 can be adjusted appropriately to adapt to the distance between the two drill holes on the structure 4 during actual installation. When the distance between the two drill holes on the structure 4 does not match the specified distance due to external or human factors, the surface strain gauge cannot be installed or needs to be stretched or compressed for installation. When installation is not possible, the structure 4 needs to be drilled again. When the surface strain gauge is installed by stretching or compression, the surface strain gauge will have initial assembly stress and the range of the surface strain gauge will be shortened. Therefore, the mounting seat of the utility model sets the connection between the sensor connecting head and the corresponding second fixing member 12 as adjustable, which can adjust the distance between the surface strain gauge and the two mounting seats to adapt to the actual distance between the two drill holes. Even if there is a deviation between the distance of the drill holes and the actual distance, the surface strain gauge can still be installed without the need to stretch or compress the surface strain gauge, which solves the problem of inaccurate measurement results caused by the need to re-drill and the initial assembly stress caused by compressing or stretching the surface strain gauge.

[0033] Preferably, the first fixing member 11 is provided with an upper and lower penetrating first mounting hole. The bolt fixing member penetrates the first mounting hole and extends into the drill hole of the structure 4 to fix the first fixing member 11 on the structure 4. The drill hole refers to the drill hole formed after drilling the structure 4. The upper and lower directions refer to the direction perpendicular to the top surface of the structure 4.

[0034] More preferably, as shown in Figure 2 and Figure 4As shown, the bolt fastener includes a first screw 13 and a first nut 14 and a washer 16 sequentially sleeved on the outside of the first screw 13. The first fastener 11 has a first groove 17, and a first mounting hole is provided in the center of the first groove 17. The bolt fastener is located within the first groove 17, and the bottom of the first screw 13 passes through the first mounting hole and extends into a drilled hole in the structure 4. The first nut 14 is threaded onto the first screw 13. The washer 16 is located below the first nut 14. By rotating the first nut 14, the washer 16 is pressed, causing the bottom of the washer 16 to fit against the groove surface of the first groove 17, thereby fixing the first fastener 11 to the structure 4.

[0035] More preferably, the first groove 17 is a semi-circular groove, and the bottom of the pad 16 is a semi-circular protrusion. In this way, when the pad 16 is pressed by turning the first nut 14, the bottom of the pad 16 can be completely fitted with the groove surface of the first groove 17, ensuring that even if the drilling of the structure 4 is skewed, the bottom of the pad 16 and the groove surface of the first groove 17 are still completely fitted. That is, it ensures that the first screw 13 can be completely fitted with the structure 4 and the first fixing member 11, avoiding the problem of the first screw 13 not being fixed tightly.

[0036] Specifically, such as Figure 6 As shown, under normal circumstances, if the first fixing member 11 does not have the first groove 17: if the drill hole is skewed, when the first screw 13 is inserted into the drill hole, the first screw 13 will not be completely perpendicular to the bottom plane of the first fixing member 11. Therefore, the first screw 13 cannot be completely fitted with the first fixing member 11, and an angle is formed between the first screw 13 and the top plane of the first fixing member 11, so the first screw 13 cannot be completely fixed.

[0037] On the contrary, such as Figure 5As shown, by setting a semicircular groove on the first fixing member 11 of the mounting seat and a pad 16 under the first nut 14, the bottom of the pad 16 is a semicircular protrusion, when the drill hole is skewed: at this time, the bottom plane of the first fixing member 11 and the pad 16, the first nut 14 no longer maintain parallel, and the bottom plane of the first fixing member 11 and the first screw 13, the drill hole are also not perpendicular. In this way, during the rotation of the first nut 14, the pad 16 will slide along the interface-spherical arc formed by the groove surface of the first groove 17 of the first fixing member 11 and the bottom protrusion surface of the pad 16 according to the skew of the first screw 13 and the drill hole, and during the sliding process, the bottom of the pad 16 is completely attached to 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 also slides along 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 is always attached to the structure 4, and the first fixing member 11, the pad 16 and the first nut 14 are tightly attached, so that the first fixing member 11 is tightly attached to the surface of the structure 4 by the assembly action between the first nut 14, the pad 16 and the first screw 13, and the fastening of the first fixing member 11 is realized.

[0038] That is, the utility model adopts the basin type mounting seat with a groove to realize the fixation of the surface strain gauge, which can solve the problem of loose screw fixation when the drill hole of the structure 4 is skewed; at the same time, the mounting structure of the position-adjustable sensor connector solves the problem of non-standard distance between the drill holes of the structure 4, so as to ensure the fastening installation of the surface strain gauge, and also can avoid the problem of initial assembly stress of the surface strain gauge caused by stretching or compressing the surface strain gauge to shorten the range of the surface strain gauge.

[0039] Further, a first gasket 15 is arranged between the first nut 14 and the pad 16, and the first gasket 15 is sleeved on the outside of the first screw 13. By arranging the first gasket 15, the friction force of the first nut 14 is increased, and additional support is provided to maintain the stability and safety of the bolt fixing member, which can prevent the bolt from loosening. By arranging the first gasket 15, the friction force of the first nut 14 is increased, and additional support is provided to maintain the stability and safety of the bolt fixing member, which can prevent the bolt from loosening, and ensure that the structure 4, the mounting seat and the sensor connector are always in a fastening state and will not slip.

[0040] Preferably, the first mounting hole is a long strip-shaped mounting hole, so as to avoid the problem that the first mounting hole of the first fixing member 11 cannot be aligned with the drill hole due to the inaccuracy of the hole diameter of the drill hole. By arranging the long strip-shaped mounting hole, the installation position of the first fixing member 11 can be adjusted appropriately to realize the alignment of the drill hole.

[0041] More preferably, the first mounting seat 1 and the second mounting seat 2 in the utility model are L-shaped mounting seats. Specifically, the first fixing part 11 is a horizontal fixing part, the second fixing part 12 is a vertical fixing part, and one end of the horizontal fixing part is fixedly connected with the bottom end of the vertical fixing part to form an L-shaped fixing part. More specifically, the horizontal fixing part and the vertical fixing part are integrally designed.

[0042] Further, as shown in Figure 3 and Figure 1 , the top end of the second fixing part 12 is provided with a left-right penetrating long-strip-shaped second groove 24, and the mounting channel is formed through the second groove 24. The two side edges of the second groove 24 respectively extend outward in the direction away from the second fixing part 12 to form the first protruding part 21 and the second protruding part 22 which are arranged at intervals. The corresponding sensor connector is fixed by clamping the first protruding part 21 and the second protruding part to fasten the first protruding part 21 and the second protruding part 22.

[0043] More preferably, the first protruding part 21 and the second protruding part 22 are both provided with a second mounting hole 25. The clamping bolt 23 is sequentially threaded through the second mounting hole 25 of the first protruding part 21 and the second mounting hole 25 of the second protruding part 22 to clamp the first protruding part 21 and the second protruding part 22. Specifically, the clamping bolt 23 includes a second nut 232, a third nut and a second screw 231, wherein the second screw 231 is sequentially threaded through the first protruding part 21 and the second protruding part 22. The second nut 232 and the third nut are respectively threadedly installed at the two ends of the second screw 231, so as to clamp and fix the first protruding part 21 and the second protruding part 22 by reversely rotating the second nut 232 and the third nut.

[0044] Specifically, the utility model also gives the fixing and mounting process of the surface strain gauge, which is specifically as follows:

[0045] Step 1, according to the direction of measuring strain force and the drilling size of the drilled hole of the structure 4 and the distance between the two drilled holes, the position marks of the drilled holes are made on the structure 4 to be measured.

[0046] Step 2, according to the marked position of the drilled hole, the structure 4 is drilled to form two drilled holes respectively. At the same time, the drilled holes are drilled vertically at the marked positions as far as possible during the drilling process. For example, it is suggested that the inclination angle of the drilled hole is controlled within 60°.

[0047] Step 3, after the drilling is completed, the drilled holes are cleaned, the anchoring glue is poured in, and the first screw 13 is inserted into the two drilled holes filled with anchoring glue respectively.

[0048] Step 4, after the anchoring adhesive in each hole is solidified, each mounting base is placed on the structure 4, and the first screw rod 13 of each mounting base is ensured to be located in the first mounting hole of the first fixing member 11 of the mounting base; then the corresponding gasket 16, first gasket 15 and first nut 14 are sequentially sleeved on the first screw rod 13; then the corresponding first nut 14 is gradually tightened, and in the process of tightening the corresponding first nut 14, the orientation of the first fixing member 11 of each mounting base needs to be adjusted to ensure that after the corresponding first nut 14 is finally tightened, the second fixing members 12 of the two mounting bases remain parallel.

[0049] In the process of tightening the corresponding first nut 14, there are two cases:

[0050] First, when the hole is not skewed, that is, the central axis of the 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 hole is perpendicular to the plane of the structure 4, at this time the bottom plane of the first fixing member 11 is completely parallel to the gasket 16, first gasket 15 and first nut 14 of the bolt fixing member, and the bottom plane of the first fixing member 11 is completely perpendicular to the corresponding first screw rod 13 and the hole without any sliding, as shown in Figure 4 .

[0051] Second, when the hole is skewed, that is, the central axis of the hole is not perpendicular to the plane of the structure 4: the first screw rod 13 inserted into the hole is not perpendicular to the plane of the structure 4, at this time the bottom plane of the first fixing member 11 is no longer parallel to the gasket 16, first gasket 15 and first nut 14 of the bolt fixing member, and the bottom plane of the first fixing member 11 is also not perpendicular to the corresponding first screw rod 13 and the hole; in the process of tightening the corresponding first nut 14, the bottom of the corresponding gasket 16 will slide along the interface between the recessed surface of the corresponding first fixing member 11 and the bottom convex surface of the corresponding gasket 16, that is, the spherical surface, according to the skew of the corresponding first screw rod 13 or the hole, and in the process of sliding, the bottom of the corresponding gasket 16 is still completely fitted with the recessed surface of the corresponding first fixing member 11; at the same time, the bottom plane of the first fixing member 11 of the corresponding mounting base also slides along the plane of the structure 4 and is always fitted with the plane of the structure 4, as shown in Figure 5 .

[0052] It is obvious that, in this embodiment, compared with the structure shown in Figure 5 after the corresponding first nut 14 is tightened, the bottom plane of the first fixing member 11 of each mounting base of the present scheme is still fitted with the plane of the structure 4, and the mounting base is still tightly fitted with the gasket 16, first gasket 15 and first nut 14, which can be tightly fixed with the structure 4 together with the assembly of the gasket, first nut 14 and corresponding first screw rod 13, and is fixed with the structure 4 together with the assembly of the gasket, first nut 14 and corresponding first screw rod 13, compared with the structure shown inFigure 2 In terms of structure, the fixing between the mounting seat and the structure 4 is more firm.

[0053] Step 5, after the two mounting seats are fixed, the first sensor connecting head 5 and the second sensor connecting head 6 are respectively inserted into the installation channel (i.e. the second groove 24) of the second fixing part 12 of the corresponding mounting seat, and then the first protruding part 21 and the second protruding part 22 of the corresponding mounting seat are fastened by the clamping bolt 23 to fix the corresponding sensor connecting head in the corresponding installation channel, so as to realize the fixing of the surface strain gauge; at this time, since the bottom plane of the first fixing part 11 of the two mounting seats is parallel to the structure 4, and the second fixing part 12 of the two mounting seats is parallel, the sensor body 3 is also completely parallel to the structure 4 at this time.

[0054] Meanwhile, when the distance between the two drill holes formed by the actual drilling is inconsistent with the planned distance, resulting in that the distance between the two mounting seats is inconsistent with the planned distance and misaligned, and when the distance between the two mounting seats is inconsistent with the planned distance and misaligned due to the skew of the drilling in the process of the installation of the mounting seat, the longer sensor connecting head designed by the utility model is adopted, and the structure that the sensor connecting head can slide in the installation channel is combined, the clamping position of each sensor connecting head in the installation channel is adjusted according to the actual distance between the two mounting seats, specifically, the two end sensor connecting heads are moved to the appropriate position and then clamped and fixed, so that it is not necessary to re-drill holes as in the prior art, and it is not necessary to stretch or compress the mounting seat, and thus the initial assembly stress of the surface strain gauge will not occur, and the accuracy of the range of the surface strain gauge is ensured.

[0055] Preferably, the second nut 232 and the first protruding part 21, and the third nut and the second protruding part 22 are both provided with second washers. The second washers are added to increase the friction and provide additional support to maintain the stability and safety of the bolted connection, so as to prevent the loosening of the bolt, so that the structure 4, the mounting seat and the sensor connecting head are always in a firm state and will not relatively slide and move, and the installation of the surface strain gauge is ensured to be firm.

[0056] The utility model adopts the fixing mode between the sensor connecting head and the mounting seat, adjusts the distance between the two mounting seats by adjusting the fixed position of the adjustable sensor connecting head, automatically compensates and adapts to the inconsistent and misaligned hole distance of the drilling, so that it is not necessary to re-drill holes and stretch or compress the mounting seat / sensor connecting head, the surface strain gauge can be normally installed, and the standard range of the surface strain gauge can be ensured.

[0057] Meanwhile, the utility model still sets up semicircular recess on the first fixing spare of each mounting seat, and cooperates semicircular convex pad to realize the installation between first screw rod and first fixing spare, structure, to guarantee that first screw rod, pad and first fixing spare can still be perfect fastening and fit under the condition of the drilling skew, perfect fit between first fixing spare and structure, ensure installation effect and measurement accurate, more need not to drill another hole. In addition, between the corresponding nut and screw rod still through adding gasket, to increase friction, provide additional support to maintain the stability and safety of bolt, prevent bolt loosening effect, thereby guarantee structure, mounting seat and sensor body always in fastening state, will not happen relative slip dislocation.

[0058] The above embodiment is only the preferred embodiment of the utility model, and cannot be used to limit the range of the utility model protection, and any non-substantial change and replacement made by the person skilled in the art on the basis of the utility model belongs to the range of the utility model claimed protection.

Claims

1. A fixing device for a surface strain gauge, the surface strain gauge comprising a strain gauge sensor body and sensor connectors respectively provided at both 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 connected with corresponding sensor connectors respectively; The first mounting seat and the second mounting seat each comprise a first fixing member, a second fixing member and a bolt fixing member, the second fixing member is provided with a left-right penetrating mounting channel, 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 an up-down penetrating first mounting hole, and the bolt fixing member penetrates through the first mounting hole and extends into a structure to fix the first fixing member on the structure.

2. The surface strain gauge fixture of claim 1, wherein, The bolt fixing member comprises a first screw rod and a first nut and a pad block 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 arranged in the middle of the first groove; The bolt fixing member is located in the first groove, and the bottom of the first screw rod of the bolt fixing member penetrates through the first mounting hole and extends into a drilled hole of the structure, the first nut is threadedly installed on the first screw rod, and the first nut is rotated to extrude the pad block, so that the bottom of the pad block is matched with the groove surface of the first groove to fix the first fixing member on the structure.

3. The surface strain gauge fixture of claim 2, wherein, The first groove is a semicircular groove, and the bottom of the pad block is a semicircular protrusion matched with the semicircular groove.

4. The surface strain gauge fixture of claim 2, wherein, A first gasket is arranged between the first nut and the pad block.

5. The surface strain gauge fixture of claim 1, wherein, The first mounting hole is a left-right direction long strip-shaped mounting hole.

6. The surface strain gauge fixture of claim 1, wherein, 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, one end of the horizontal fixing member is fixedly connected with the bottom end of the vertical fixing member to form the L-shaped fixing member, and the horizontal fixing member and the vertical fixing member are designed in one piece.

7. The surface strain gauge fixture of claim 1, wherein, The top end of the second fixing member is provided with a left-right penetrating second groove, and the mounting channel is formed through the second groove, the two side edges of the second groove respectively extend outward in a direction away from the second fixing member to form a first protruding part and a second protruding part which are arranged at intervals, the first protruding part and the second protruding part are clamped to fasten the first protruding part and the second protruding part, and then the corresponding sensor connector located in the second groove is fixed.

8. The surface strain gauge fixture of claim 7, wherein, The first protruding part and the second protruding part are each provided with a second mounting hole, and a clamping screw is sequentially inserted through the second mounting hole of the first protruding part and the second mounting hole of the second protruding part to clamp the first protruding part and the second protruding part.

9. The surface strain gauge fixture of claim 8, wherein, The clamping screw comprises a second nut, a third nut and a second screw rod, the second screw rod sequentially penetrates through the first protruding part and the second protruding part, and the second nut and the third nut are threadedly installed at two ends of the second screw rod respectively to clamp and fix the first protruding part and the second protruding part by reversely rotating the second nut and the third nut.

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