Surface type strain gauge fixing device

Abstract

The utility model relates to a surface type strainmeter fixing device, which is used for fixing a strainmeter main body on the surface of a measured object and comprises two strainmeter mounting seats with fixing screw rods, upper pressing blocks are arranged on the strainmeter mounting seats, a strainmeter bottom plate and a strainmeter protection cover are clamped between the upper pressing blocks and the strainmeter mounting seats, and the strainmeter bottom plate and the strainmeter protection cover are arranged on the strainmeter mounting seats. And the strain gauge main body is limited between the strain gauge bottom plate and the protective cover and is connected with the upper pressing block through a screw. During use, the mounting jig plate is fixed with the strain gauge mounting seat in advance, the strain gauge bottom plate, the strain gauge main body, the strain gauge protection cover, the upper pressing block and the reinforcing rod form a whole for replacing the mounting jig plate, and the positions of the through holes in the four corners of the mounting jig plate are determined according to the length of the strain gauge main body. The strain gauge mounting seat can be positioned in advance and the subsequent strain gauge can be rapidly replaced, time and labor are saved, the strain gauge main body is protected in all directions, and the application range is wider.

Description

Technical Field

[0001] The utility model relates to the technical field of optical sensing, in particular to a surface type strain gauge fixing device. Background Art

[0002] The invention patent with publication number CN115560682B provides a displacement measuring device and a manufacturing method thereof. The displacement measuring device in the invention is a surface strain gauge, such as Figure 1 The figure shows the main structure of the surface strain gauge. This surface strain gauge is produced by the parent company. During the actual installation process, our company found that its on-site installation process is relatively complicated. It requires precise measurement and drawing to determine the installation location, and then drilling or binding according to the surface strain gauge installation method, and finally installing the strain gauge.

[0003] This surface strain gauge installation method has the following disadvantages:

[0004] 1. There are many steps and work involved in on-site installation, which requires a lot of manpower and time;

[0005] 2. The site environment and weather conditions are highly demanding, and the installation process and quality are easily affected by the environment and weather conditions;

[0006] 3. The skill level and work attitude requirements for on-site installation personnel are relatively high;

[0007] 4. To ensure measurement accuracy, the strain gauge has a fragile structure and is easily deformed, and is easily damaged during transportation and on-site installation;

[0008] 5. The strain gauge lacks protective devices after installation. Utility Model Content

[0009] Therefore, the technical problem to be solved by the present invention is to overcome the problems of the surface strain gauge in the prior art, such as the complicated installation and lack of protective devices.

[0010] To solve the above technical problems, the present invention provides a surface strain gauge fixing device for fixing a strain gauge body on the surface of a measured object. Both ends of the strain gauge body are provided with a first bolt hole and a positioning hole, comprising:

[0011] Two strain gauge mounting bases, each having a fixing screw provided on its bottom surface, a first mounting slot provided in the middle of its upper surface, and second bolt holes provided at both ends of the strain gauge mounting base;

[0012] a strain gauge base plate, one end of the strain gauge base plate being clamped in the first mounting slot of one of the strain gauge mounting seats, and the other end of the strain gauge base plate being clamped in the first mounting slot of the other strain gauge mounting seat, the strain gauge base plate being used to support the strain gauge body;

[0013] A strain gauge protective cover, which is buckled to the strain gauge base plate, and limit holes are provided at both ends of the strain gauge protective cover. The strain gauge protective cover cooperates with the strain gauge base plate to limit the circumferential direction of the strain gauge body;

[0014] Two upper pressing blocks, both ends of the upper pressing blocks are fixed to the strain gauge mounting seat by screws, a second mounting slot is provided on the lower surface of the upper pressing block, a limit block is provided at the bottom of the second mounting slot, the limit block is clamped in the limit hole of the strain gauge protective cover, the bottom of the second mounting slot is closely attached to the strain gauge protective cover, and a first through hole is further provided on the upper pressing block, the first through hole corresponds to the first bolt hole on the strain gauge body;

[0015] A reinforcing rod, which is U-shaped, with a first connecting block provided at one end of the reinforcing rod, the first connecting block provided with a second through hole, a second connecting block provided at the other end of the reinforcing rod, the second connecting block provided with a third through hole, the second through hole corresponding to the first through hole on one of the upper pressing blocks, and the third through hole corresponding to the first through hole on the other upper pressing block;

[0016] A positioning jig plate is provided with four fourth through holes on the four corners of the positioning jig plate corresponding to the second bolt holes on the two strain gauge mounting seats.

[0017] In one embodiment of the present invention, a pin block for positioning the strain gauge body is further provided on the limiting block of the upper pressing block.

[0018] In one embodiment of the present invention, strain gauge welding holes are provided at both ends of the strain gauge pressure plate.

[0019] In one embodiment of the present invention, an optical fiber lead-out hole is provided at one end of the strain gauge protection cover.

[0020] In an embodiment of the present invention, the strain gauge base plate and the strain gauge protection cover are both made of plastic.

[0021] In one embodiment of the present invention, an installation indicating notch is provided on the upper pressing block.

[0022] The above technical solution of the utility model has the following advantages compared with the prior art:

[0023] The surface strain gauge fixing device described in the present invention is as follows: when in use, the first step is to fix the mounting fixture plate and the two strain gauge mounting seats, and stick the strain gauge body on the strain gauge base plate, and at the same time, the strain gauge protective cover is buckled with the strain gauge base plate to form a preliminary limit for the strain gauge body, and then the two upper pressure blocks are clamped into the two ends of the strain gauge protective cover, and finally, screws are used to pass through the two ends of the reinforcing rod and the upper pressure blocks in sequence and fixedly connected to the strain gauge body, thereby, the strain gauge base plate, the strain gauge body, the strain gauge protective cover, the upper pressure block and the reinforcing rod form a replacement whole; the second step is to drill two deep holes on the surface of the object to be measured (such as the concrete surface), and fill the holes with anchor glue, and then insert the two strain gauge mounting seats connected to the mounting fixture plate into the holes, wait for the anchor glue to cure for 24 hours, then remove the mounting fixture plate and install the above-mentioned replacement whole formed by the strain gauge base plate, the strain gauge body, the strain gauge protective cover, the upper pressure block and the reinforcing rod; the third step is to fix the upper pressure block and the strain gauge mounting seat with screws, and finally remove the reinforcing rod. This device only needs to determine the position of the fourth through holes on the four corners of the installation fixture plate according to the length of the strain gauge body, so that the subsequent strain gauge can be quickly replaced, which is very time-saving and labor-saving, and ensures the positioning accuracy of the strain gauge installation. At the same time, it provides all-round protection for the strain gauge body and has a wider range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below based on the specific embodiments of the present invention and in conjunction with the accompanying drawings, wherein

[0025] Figure 1 It is the main structure of the existing surface strain gauge;

[0026] Figure 2 This is a schematic diagram of the overall structure of the surface strain gauge fixing device of the utility model;

[0027] Figure 3 It is a cross-sectional schematic diagram of the surface strain gauge fixing device of the utility model;

[0028] Figure 4 for Figure 2 The overall structural diagram of the surface type strain gauge shown is a diagram with the strain gauge protection cover removed;

[0029] Figure 5 for Figure 2 Schematic diagram of the overall structure of the strain gauge protection cover in the surface strain gauge fixture shown:

[0030] Figure 6 for Figure 2 Schematic diagram of the overall structure of the strain gauge base plate in the surface strain gauge fixing device shown;

[0031] Figure 7for Figure 2 Schematic diagram of the overall structure of the upper pressure block in the surface strain gauge fixture shown:

[0032] Figure 8 for Figure 2 Schematic diagram of the overall structure of the strain gauge mounting base in the surface strain gauge fixing device shown.

[0033] Explanation of the reference numerals in the accompanying drawings in the specification: 1. Strain gauge body; 110. First bolt hole; 120. Positioning hole; 2. Strain gauge mounting base; 210. Fixing screw; 220. First mounting slot; 230. Second bolt hole; 3. Strain gauge base plate; 310. Strain gauge welding hole; 4. Strain gauge protective cover; 410. Limiting hole; 420. Optical fiber lead-out hole; 5. Upper pressure block; 510. Second mounting slot; 520. Limiting block; 530. First through hole; 6. Reinforcing rod; 610. First connecting block; 611. Second through hole; 620. Second connecting block; 621. Third through hole; 7. Positioning fixture plate; 710. Fourth through hole; 8. Pin block; 9. Installation indicator notch. DETAILED DESCRIPTION

[0034] The present invention will be further described below with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it. However, the embodiments are not intended to limit the present invention.

[0035] Reference Figures 1 to 8 As shown, the present invention provides a surface type strain gauge fixing device for fixing a strain gauge body 1 on the surface of a measured object. Both ends of the strain gauge body 1 are provided with a first bolt hole 110 and a positioning hole 120, including:

[0036] Two strain gauge mounting bases 2, each having a fixing screw 210 disposed on its bottom surface, a first mounting slot 220 disposed in the middle of its upper surface, and second bolt holes 230 disposed at both ends of the strain gauge mounting base 2;

[0037] A strain gauge base plate 3, one end of the strain gauge base plate 3 is clamped in the first mounting slot 220 of one of the strain gauge mounting seats 2, and the other end of the strain gauge base plate 3 is clamped in the first mounting slot 220 of the other strain gauge mounting seat 2. The strain gauge base plate 3 is used to support the strain gauge body 1;

[0038] The strain gauge protective cover 4 is buckled with the strain gauge base plate 3. The two ends of the strain gauge protective cover 4 are also provided with limiting holes 410. The strain gauge protective cover 4 cooperates with the strain gauge base plate 3 to limit the circumferential direction of the strain gauge body 1;

[0039] Two upper pressing blocks 5, both ends of which are fixed to the strain gauge mounting base 2 by screws. A second mounting slot 510 is provided on the lower surface of the upper pressing block 5. A limit block 520 is provided at the bottom of the second mounting slot 510. The limit block 520 is clamped in the limit hole 410 of the strain gauge protective cover 4. The bottom of the second mounting slot 510 is closely attached to the strain gauge protective cover 4. A first through hole 530 is also provided on the upper pressing block 5. The first through hole 530 corresponds to the first bolt hole 110 on the strain gauge body 1;

[0040] The reinforcing rod 6 is U-shaped, with a first connecting block 610 provided at one end thereof, the first connecting block 610 being provided with a second through hole 611, and a second connecting block 620 provided at the other end thereof, the second connecting block 620 being provided with a third through hole 621, the second through hole 611 corresponding to the first through hole 530 on one of the upper pressing blocks 5, and the third through hole 621 corresponding to the first through hole 530 on the other upper pressing block 5;

[0041] The positioning fixture plate 7 has four fourth through holes 710 provided on its four corners, corresponding to the second bolt holes 230 on the two strain gauge mounting seats 2 .

[0042] When using this surface type strain gauge fixing device, the first step is to fix the mounting fixture plate to the two strain gauge mounting seats 2, and stick the strain gauge body 1 on the strain gauge base plate 3, and at the same time, snap the strain gauge protection cover 4 and the strain gauge base plate 3 together to form a preliminary limit for the strain gauge body 1, and then insert the two upper pressure blocks 5 into the two ends of the strain gauge protection cover 4, and finally use screws to pass through the two ends of the reinforcing rod 6 and the upper pressure block 5 in sequence and fix them with the strain gauge body 1. Thus, the strain gauge base plate 3, the strain gauge body 1, the strain gauge protection cover 4, and the upper The pressure block 5 and the reinforcing rod 6 form a replacement whole; the second step: drill two deep holes on the surface of the object to be measured (such as the concrete surface), fill the holes with anchor glue, and then insert the two strain gauge mounting bases 2 connected to the mounting fixture plate into the holes. After waiting for the anchor glue to cure for 24 hours, remove the mounting fixture plate and install the replacement whole formed by the strain gauge base plate 3, strain gauge body 1, strain gauge protective cover 4, upper pressure block 5 and reinforcing rod 6; the third step is to use screws to fix the upper pressure block 5 and the strain gauge mounting base 2, and finally remove the reinforcing rod 6. This device only needs to determine the position of the fourth through hole 710 on the four corners of the mounting fixture plate according to the length of the strain gauge body 1, so as to realize the subsequent rapid replacement of the strain gauge, which is very time-saving and labor-saving, and ensures the positioning accuracy of the strain gauge installation. At the same time, it provides all-round protection for the strain gauge body 1, and has a wider range of applications.

[0043] Specifically, in addition to the strain gauge body 1, the existing strain gauge also includes a MEMS chip and a collimator and an optical fiber passing through the collimator. The strain gauge protection cover 4 and the strain gauge base plate 3 in this example can completely include other mounting parts on the strain gauge body 1, so they are not described in detail; when fixing the strain gauge body 1, the present invention needs to open a first bolt hole 110 and a limit hole 410 at the connecting parts of the two ends of the strain gauge body 1 without affecting the performance of the strain gauge, so as to facilitate the fixation of the strain gauge body 1; the mounting fixture plate and the reinforcing rod 6 are only used to install the strain gauge. After the positioning of the strain gauge mounting seat 2 is completed, the mounting fixture will be removed for the synchronous replacement of the strain gauge, and the reinforcing rod 6 will be removed after the strain gauge is replaced. In addition, the installation jig plate needs to design the positions of the fourth through holes 710 on the four corners according to the length of the strain gauge body 1 to ensure that the upper pressure block 5 can be connected to the strain gauge mounting seat 2 while the limit block 520 on the upper pressure block 5 is clamped into the limit hole 410 of the strain gauge protective cover 4 to complete the position positioning of the strain gauge; the reinforcing rod 6 can play the role of buckling and limiting the strain gauge protective cover 4 and the strain gauge base plate 3 to the strain gauge body 1 before the strain gauge is replaced with the installation jig plate. After the upper pressure block 5 is fixed to the strain gauge mounting seat 2, only the role of the upper pressure block 5 can replace the reinforcement role. At the same time, the reinforcing rod 6, the strain gauge protective cover 4 and the strain gauge base plate 3 can play a good protective role during the transportation and installation of the strain gauge.

[0044] Furthermore, a pin block 8 for positioning the strain gauge body 1 is provided on the limit block 520 of the upper pressing block 5 .

[0045] Specifically, the design of the upper limit block 520 on the upper pressing block 5 can better limit the strain gauge body 1.

[0046] Furthermore, strain gauge welding holes 310 are provided at both ends of the strain gauge pressure plate.

[0047] Specifically, the strain gauge welding hole 310 is adapted to the size of the mounting seats at both ends of the strain gauge body 1 to facilitate welding of the strain gauge.

[0048] Furthermore, an optical fiber lead-out hole 420 is provided at one end of the strain gauge protection cover 4 .

[0049] Specifically, the optical fiber lead-out hole 420 is used to lead out the optical fiber on the strain gauge.

[0050] Furthermore, the strain gauge base plate 3 and the strain gauge protection cover 4 are both made of plastic.

[0051] Specifically, the strain gauge base plate 3 and the strain gauge protection cover 4 are made of polymer plastic material, and after the reinforcing rod 6 is removed, there will be no obstruction to the deformation of the strain gauge.

[0052] Furthermore, an installation indicating notch 9 is provided on the upper pressing block 5 .

[0053] Specifically, the installation indicator notch 9 facilitates the operator to install the upper pressing block 5 to ensure that the above-mentioned limit block 520 and the pin block 8 for positioning are in the appropriate direction to avoid misoperation.

[0054] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A surface type strain gauge fixing device, used for fixing a strain gauge body on the surface of a measured object, wherein both ends of the strain gauge body are provided with a first bolt hole and a positioning hole, characterized in that: include: Two strain gauge mounting bases, each having a fixing screw provided on its bottom surface, a first mounting slot provided in the middle of its upper surface, and second bolt holes provided at both ends of the strain gauge mounting base; a strain gauge base plate, one end of the strain gauge base plate being clamped in the first mounting slot of one of the strain gauge mounting seats, and the other end of the strain gauge base plate being clamped in the first mounting slot of the other strain gauge mounting seat, the strain gauge base plate being used to support the strain gauge body; A strain gauge protective cover, which is buckled to the strain gauge base plate, and limit holes are provided at both ends of the strain gauge protective cover. The strain gauge protective cover cooperates with the strain gauge base plate to limit the circumferential direction of the strain gauge body; Two upper pressing blocks, both ends of the upper pressing blocks are fixed to the strain gauge mounting seat by screws, a second mounting slot is provided on the lower surface of the upper pressing block, a limit block is provided at the bottom of the second mounting slot, the limit block is clamped in the limit hole of the strain gauge protective cover, the bottom of the second mounting slot is closely attached to the strain gauge protective cover, and a first through hole is further provided on the upper pressing block, the first through hole corresponds to the first bolt hole on the strain gauge body; A reinforcing rod, which is U-shaped, with a first connecting block provided at one end of the reinforcing rod, the first connecting block provided with a second through hole, a second connecting block provided at the other end of the reinforcing rod, the second connecting block provided with a third through hole, the second through hole corresponding to the first through hole on one of the upper pressing blocks, and the third through hole corresponding to the first through hole on the other upper pressing block; A positioning jig plate is provided with four fourth through holes on the four corners of the positioning jig plate corresponding to the second bolt holes on the two strain gauge mounting seats.

2. The surface strain gauge fixing device according to claim 1, characterized in that: The limiting block of the upper pressing block is further provided with a pin block for positioning the strain gauge body.

3. The surface strain gauge fixing device according to claim 1, wherein: Strain gauge welding holes are provided at both ends of the strain gauge base plate.

4. The surface strain gauge fixing device according to claim 1, wherein: One end of the strain gauge protection cover is provided with an optical fiber lead-out hole.

5. The surface strain gauge fixing device according to claim 1, wherein: The strain gauge base plate and the strain gauge protection cover are both made of plastic.

6. The surface strain gauge fixing device according to claim 1, wherein: The upper pressing block is provided with an installation indicating notch.

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