A strain gauge pressing and fixing device and method

Abstract

The present invention relates to the technical field of strain gauge pasting, and particularly relates to a strain gauge pressing and fixing device and method. The pressing and fixing device includes a pressure applying device at the tooth root, and the pressure applying device at the tooth root includes a first fixing bracket, a first fastening assembly, and a first pressing assembly; the first fixing bracket includes a bearing plate, one end of the bearing plate is provided with a first fixing block, and the other end is bent to form a mounting plate; the first fastening assembly includes a first threaded rod and a first fastening block, the first threaded rod is installed on the mounting plate, the first fastening block is arranged at the inner end of the first threaded rod, and the first fixing block and the first fastening block are clamped at both ends of the gear; the first pressing assembly includes a first adjusting screw and a first elastic element, the first adjusting screw is installed on the bearing plate, and the first elastic element is arranged at the inner end of the first adjusting screw. By means of the present invention, problems such as inaccurate pressure control and low reliability of test results in the prior art are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of strain gauge pasting, and particularly to a strain gauge pressing and fixing device and method. Background Art

[0002] A strain gauge, also known as a resistance strain gauge, is a sensor used to measure the stress change on the surface of an object and is widely used in stress testing in the engineering field. In gear strength tests, strain gauges are used to monitor the stress state of gears under dynamic and static conditions, which is crucial for evaluating the load-carrying capacity of gears and predicting their fatigue life.

[0003] The strain gauge pasting and installation process generally requires timed and quantitative pressing after applying special glue to ensure reliable bonding. High-temperature resistant strain gauges need to perform a specific installation process, which requires precise and long-term pressing pressure and ambient temperature control process flows at a specific ambient temperature.

[0004] In the prior art, pressure is usually applied manually or by a simple mechanical device, but it is difficult to precisely control the applied pressure, and the consistency of strain gauge pasting and installation is poor, thus affecting the accuracy of stress test results; for strain gauges in long-term service, it is even more difficult to ensure the reliability of the stress test system. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the purpose of the embodiments of the present invention is to provide a strain gauge pressing and fixing device and method. According to the structural characteristics of gears, pressing devices for the tooth root, end face, and web are respectively designed, which can adapt to certain gear structure changes, and solve problems such as inaccurate pressure control and low reliability of test results in the prior art. Through this device and method, it is possible to accurately and reliably fix strain gauges at different key parts of gears, ensure the pasting quality and reliability of strain gauges in a high-temperature environment, thereby achieving high-precision stress testing and improving the accuracy and reliability of gear strength tests.

[0006] To achieve the above purpose, the embodiments of the present invention provide the following technical solutions:

[0007] A strain gauge pressing and fixing device includes a pressing device at the tooth root. The pressing device at the tooth root includes a first fixing bracket, a first fastening assembly, and a first pressing assembly. The first fixing bracket includes a bearing plate, with a first fixing block provided at one end of the bearing plate and an installation plate formed by bending the other end. The first fastening assembly includes a first threaded rod and a first fastening block. The first threaded rod is installed on the installation plate, and the first fastening block is provided at the inner end of the first threaded rod. The first fixing block and the first fastening block are clamped at both ends of the gear. The first pressing assembly includes a first adjusting screw and a first elastic element. The first adjusting screw is installed on the bearing plate, and the first elastic element is provided at the inner end of the first adjusting screw for pressing and fixing the strain gauge pasted at the tooth root of the gear.

[0008] Optionally, the first fastening assembly further includes a first fastening element and a first anti-loosening element. The first fastening element is provided at the outer end of the first threaded rod, and the first anti-loosening element is installed between the installation plate and the first fastening element.

[0009] Optionally, it further includes a pressing device at the small end face. The pressing device at the small end face includes a second fixing bracket, a second fastening assembly, and a second pressing assembly. The second fixing bracket includes a bearing plate, with a fixing plate formed by bending one end of the bearing plate and an installation plate formed by bending the other end. A second fixing block is provided on the fixing plate. The second fastening assembly includes a second threaded rod and a second fastening block. The second threaded rod is installed on the installation plate, and the second fastening block is provided at the inner end of the second threaded rod. The second fixing block and the second fastening block are clamped at both ends of the gear. The second pressing assembly includes a second adjusting screw and a second elastic element. The second adjusting screw is installed on the fixing plate, and the second elastic element is provided at the inner end of the second adjusting screw for pressing and fixing the strain gauge pasted at the small end face of the gear.

[0010] Optionally, one end of the second adjusting screw is fixedly connected with a third knob, and the other end of the second adjusting screw is connected with a second elastic element.

[0011] Optionally, a second installation hole is opened at one end of the second fixing bracket away from the second adjusting screw, and a second fastening element is threadedly connected in the second installation hole.

[0012] Optionally, it further includes a pressing device at the large end face of the web. The pressing device at the large end face of the web includes a third adjusting screw, a third elastic element, and a third fastening element. The third adjusting screw is fixed on the weight reduction hole of the gear. The third elastic element and the third fastening element are both installed on the third adjusting screw, and the third elastic element and the third fastening element are respectively located on both sides of the web of the gear. The third elastic element is disposed opposite to the large end face of the web of the gear for pressing and fixing the strain gauge pasted at the large end face of the web of the gear.

[0013] Optionally, a fifth anti-loosening element is threadedly mounted on the upper part of the third adjusting screw. A first adjusting block is arranged below the fifth anti-loosening element. One end profile of the first adjusting block is adapted to the small end face of the gear web.

[0014] Optionally, it further includes a pressing device at the small end face of the web, which is used to press and fix the strain gauge pasted at the small end face of the gear web. The pressing device at the small end face of the web includes fastening bolts. There are two fastening bolts, and the two fastening bolts are fixed in adjacent two gear weight-reducing holes.

[0015] Optionally, adjacent two fastening bolts are connected by a support plate. A plurality of fourth adjusting screws are threadedly connected to the support plate. One end of the fourth adjusting screw is fixedly connected to a fifth knob, and the other end is fixedly connected to a fourth elastic element. The fourth elastic element is arranged facing the small end face of the gear web.

[0016] The embodiment of the present invention also provides a method for pressing and fixing a strain gauge. Using a strain gauge pressing and fixing device as described above, it includes the following steps: fixing the pressing device on the gear, placing a pressure sensor between the elastic element and the gear surface; rotating the adjusting screw and monitoring the pressure value of the pressure sensor in real time until the pressure value reaches the set pressure threshold, and marking the position where the adjusting screw is located at this time; removing the pressure sensor, pasting the strain gauge and rotating the adjusting screw to the previously marked position to complete the pressing and fixing of the strain gauge.

[0017] One or more technical solutions provided in the embodiment of the present invention have at least the following technical effects or advantages:

[0018] According to the structural characteristics of the gear, the present invention respectively designs pressing devices for the tooth root, end face and spoke, and then cooperates with the strain gauge to conduct a comprehensive test on the gear, covering the key stress areas of the gear, thereby providing more comprehensive stress data. In addition, the device can adapt to certain gear structure changes, can adapt to gears of different sizes and shapes, reduces the need to design different fixing devices for different gears, reduces the cost of tooling fixtures and improves efficiency. The improvement of this applicable range has high practical value in industrial applications.

[0019] The present invention adds a pressure quantitative adjustment structure, and calibrates the position of the adjusting screw in cooperation with the pressure sensor to achieve quantitative adjustment of the pressure applied to the strain gauge. This quantitative adjustment ability enables the operator to precisely control the pressure applied to the strain gauge, ensures the consistency of the strain gauge pasting and installation, and avoids deviations in the strain gauge data caused by inappropriate pressure, thereby affecting the reliability of the test results. By quantifying the adjusted pressure, the present invention not only improves the accuracy of the test, but also improves the repeatability and traceability of the test process.

[0020] The design of the elastic element in the present invention ensures complete contact between the pressure - applying surface and the strain gauge, achieving uniform pressure on the strain gauge. This reduces the risk of failure of the strain gauge due to non - uniform stress. By ensuring uniform pressure on the strain gauge, the present invention improves the reliability of the stress - testing system, which is particularly important for application scenarios that require long - term monitoring and analysis of gear performance.

[0021] Advantages of additional aspects of the present invention will be given in the following description, some of which will become obvious from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings. Additionally, the distances or sizes between parts are exaggerated for showing the positions of each part, and the schematic diagrams are only for illustration.

[0023] Figure 1 Schematic diagram of the overall structure of the pressing and fixing device in Embodiment 1 of the present invention;

[0024] Figure 2 Schematic diagram of the pressure - applying device structure at the tooth root in Embodiment 1 of the present invention;

[0025] Figure 3 Schematic diagram of the connection between the pressure - applying device at the tooth root and the gear in Embodiment 1 of the present invention;

[0026] Figure 4 Schematic diagram of the pressure - applying device structure at the small - end face in Embodiment 1 of the present invention;

[0027] Figure 5 Schematic diagram of the connection between the pressure - applying device at the small - end face and the gear in Embodiment 1 of the present invention;

[0028] Figure 6 Schematic diagram of the pressure - applying device structure at the large - end face of the web in Embodiment 1 of the present invention;

[0029] Figure 7 Schematic diagram of the connection between the pressure - applying device at the large - end face of the web and the gear in Embodiment 1 of the present invention;

[0030] Figure 8 Schematic diagram of the pressure - applying device structure at the small - end face of the web in Embodiment 1 of the present invention;

[0031] Figure 9 Schematic diagram of the connection between the pressure - applying device at the small - end face of the web and the gear in Embodiment 1 of the present invention;

[0032] Figure 10 Schematic diagram of the top surface structure of the gear in Embodiment 1 of the present invention;

[0033] Figure 11 Schematic diagram of the bottom surface structure of the gear in Embodiment 1 of the present invention;

[0034] In the figure: 1, pressure applying device at the tooth root; 11, first adjusting screw; 12, first elastic element; 13, first fixing bracket; 14, first fastening element; 15, first anti-loosening element; 16, first fixing block; 17, first threaded rod; 18, first fastening block; 19, second anti-loosening element; 2, pressure applying device at the small end face; 21, second adjusting screw; 22, second elastic element; 23, second fixing bracket; 24, second fastening element; 25, third anti-loosening element; 26, second fixing block; 27, second threaded rod; 28, second fastening block; 29, fourth anti-loosening element; 3, pressure applying device at the large end face of the web; 31, third adjusting screw; 32, third elastic element; 33, first adjusting block; 34, third fastening element; 35, fifth anti-loosening element; 4, pressure applying device at the small end face of the web; 41, fourth adjusting screw; 42, fourth elastic element; 43, support plate; 44, second adjusting block; 45, third adjusting block; 46, sixth anti-loosening element; 47, seventh anti-loosening element; 48, fourth fastening element; 49, fastening bolt; 5, gear; 6, strain gauge; 7, gear tooth root; 8, small end face of the gear; 9, small end face of the gear web; 10, large end face of the gear web. Detailed implementation manners

[0035] It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0036] The gear 5 mentioned in the present invention is a helical bevel gear. In the structural strength test of the helical bevel gear, strain gauges 6 need to be pasted at the gear tooth root 7, the small end face 8 of the gear, the small end face 9 of the gear web, and the large end face 10 of the gear web, as Figure 10 and Figure 11 shown, where the small end face 9 of the gear web and the large end face 10 of the gear web are the top surface and the bottom surface of the gear web respectively.

[0037] Embodiment 1

[0038] A typical implementation manner of the present invention, as Figure 1As shown in the figure, a strain gauge 6 pressing and fixing device includes a pressing device 1 at the tooth root, a pressing device 2 at the small end face, a pressing device 3 at the large end face of the web, and a pressing device 4 at the small end face of the web. Among them, the pressing device 1 at the tooth root is used to press and fix the strain gauge 6 pasted at the tooth root of the gear 5, the pressing device 2 at the small end face is used to press and fix the strain gauge 6 pasted at the small end face of the gear 5, the pressing device 3 at the large end face of the web is used to press and fix the strain gauge 6 pasted at the large end face of the web of the gear 5, and the pressing device 4 at the small end face of the web is used to press and fix the strain gauge 6 pasted at the small end face of the web of the gear 5.

[0039] According to the structural characteristics of the gear 5, the present invention respectively designs pressing devices for the tooth root, end face, and spoke (large end face and small end face of the web), and then cooperates with the strain gauge 6 to conduct a comprehensive test on the gear 5, covering the key stress areas of the gear 5, thereby providing more comprehensive stress data. In addition, the device can adapt to certain structural changes of the gear 5, can adapt to gears 5 of different sizes and shapes, reduces the need to design different fixing devices for different gears 5, reduces the cost of tooling and fixtures, and improves efficiency. The improvement of the applicable range has high practical value in industrial applications.

[0040] Specifically, as Figure 2 , Figure 3 shown in the figure, the pressing device 1 at the tooth root includes a first fixing bracket 13. The first fixing bracket 13 is U-shaped and includes a first side plate and a first connecting plate. There are two first side plates, and the two first side plates are symmetrically arranged at both ends of the first connecting plate. The two first side plates are respectively at a set angle with the first connecting plate. One end of one first side plate away from the first connecting plate is provided with a first fixing block 16, and a first mounting hole is provided on the other first side plate. A first fastening element 14 is threadedly connected in the first mounting hole.

[0041] The first fastening element 14 includes a first threaded rod 17. The first threaded rod 17 is threadedly connected with the first mounting hole. The first threaded rod 17 is perpendicular to the first side plate. One end of the first threaded rod 17 is provided with a first knob, and the other end of the first threaded rod 17 is provided with a first fastening block 18. The first fastening block 18 is arranged opposite to the first fixing block 16. By rotating the first knob, through the threaded connection between the first threaded rod 17 and the first mounting hole, the first fastening block 18 moves along the axis direction of the first threaded rod 17.

[0042] During use, first, hook the outer edge of one end face of the gear 5 with one of the first side plates and the first fixing block 16 on the first side plate, and the other first side plate is close to the other end face of the gear 5. Rotate the first knob to make the first fastening block 18 move towards the end face side of the gear 5 and contact the end face of the gear 5, so as to fix the first fixing bracket 13 on the gear 5.

[0043] A first anti-loosening element 15 is also sleeved on the first threaded rod 17. The first anti-loosening element 15 is a spring. One end of the first anti-loosening element 15 is in contact with the first side plate, and the other end is in contact with the first knob, so as to prevent the first fastening element 14 from loosening during vibration or long-term use by means of the first anti-loosening element 15.

[0044] A plurality of first adjusting screws 11 are threadedly connected to the first connecting plate. A second knob is arranged at one end of the first adjusting screw 11. The other end of the first adjusting screw 11 is rotatably connected to a first elastic element 12. The first elastic element 12 is disposed opposite to the tooth root of the gear 5. The first elastic element 12 is made of a high-temperature-resistant elastic material and has a certain elasticity, and is used to generate deformation when the first adjusting screw 11 rotates, so as to apply a uniform pressure to the strain gauge 6.

[0045] The design of the elastic element ensures the complete contact between the pressure-applying surface and the strain gauge 6, and realizes the uniform pressure application to the strain gauge 6. The risk of failure of the strain gauge 6 caused by uneven force is reduced. By ensuring the uniform pressure application to the strain gauge 6, the present invention improves the reliability of the stress test system, which is particularly important for application scenarios that require long-term monitoring and analysis of the performance of the gear 5.

[0046] The strain gauge 6 is disposed between the tooth root of the gear 5 and the first elastic element 12. The second knob is used to drive the first adjusting screw 11 to axially move, squeeze the first elastic element 12 and cause the first elastic element 12 to deform to different degrees, so as to realize the adjustment of different pressing forces on the strain gauge 6.

[0047] A second anti-loosening element 19 is sleeved on the first adjusting screw 11. The second anti-loosening element 19 is a spring. One end of the second anti-loosening element 19 is connected to the first connecting plate, and the other end is connected to the second knob, so as to prevent the first adjusting screw 11 from loosening during vibration or long-term use by means of the second anti-loosening element 19.

[0048] As Figure 4 、 Figure 5 shown, the pressure-applying device 2 at the small-end end face includes a second fixing bracket 23. The second fixing bracket 23 includes a second side plate and a second connecting plate. There are two second side plates, and the two second side plates are respectively located at both ends of the second connecting plate and form a set angle with the second connecting plate. One of the second side plates is a triangular structure, and second fixing blocks 26 are arranged on both sides of its bottom. A second adjusting screw 21 is threadedly connected to the middle of its bottom. One end of the second adjusting screw 21 is fixedly connected to a third knob, and the other end of the second adjusting screw 21 is connected to a second elastic element 22. The second elastic element 22 is made of a high-temperature-resistant elastic material and has a certain elasticity. Another second side plate is provided with a second mounting hole, and a second fastening element 24 is threadedly connected in the second mounting hole.

[0049] The second fastening element 24 includes a second threaded rod 27 which is threadedly connected to the second mounting hole. The second threaded rod 27 is perpendicular to the second side plate. One end of the second threaded rod 27 is provided with a fourth knob, and the other end of the second threaded rod 27 is provided with a second fastening block 28. The second fastening block 28 is arranged opposite to the second elastic element 22. By rotating the fourth knob, through the threaded connection between the second threaded rod 27 and the second mounting hole, the second fastening block 28 is enabled to move along the axial direction of the second threaded rod 27.

[0050] During use, first, hook the outer edge of one end face of the gear 5 with one of the second side plates and the two second fixing blocks 26 on the second side plate, and the other second side plate is close to the other end face of the gear 5. Rotate the fourth knob to move the second fastening block 28 towards the side of the gear 5 end face and make it contact with the gear 5 end face, thereby fixing the second fixing bracket 23 on the gear 5.

[0051] At this time, the second elastic element 22 is arranged facing the small end face of the gear 5, and the strain gauge 6 is placed between the small end face of the gear 5 and the second elastic element 22. Rotate the third knob to drive the second adjusting screw rod 21 to axially move by using the third knob, squeeze the second elastic element 22 and cause the second elastic element 22 to deform to different degrees, so as to realize the adjustment of different pressing forces on the strain gauge 6.

[0052] A third anti-loosening element 25 is sleeved on the second threaded rod 27. The third anti-loosening element 25 is a spring. One end of the third anti-loosening element 25 is connected to the second side plate, and the other end is connected to the fourth knob, thereby using the third anti-loosening element 25 to prevent the second threaded rod 27 from loosening during vibration or long-term use.

[0053] A fourth anti-loosening element 29 is sleeved on the outside of the second adjusting screw rod 21. The fourth anti-loosening element 29 is a spring. One end of the fourth anti-loosening element 29 is connected to the second side plate, and the other end is connected to the third knob, thereby using the fourth anti-loosening element 29 to prevent the second adjusting screw rod 21 from loosening during vibration or long-term use.

[0054] As Figure 6 and Figure 7 shown, the pressing device 3 at the large end face of the web includes a third adjusting screw rod 31 which is fixed on the weight-reducing hole of the gear 5. Specifically, the longitudinal section of the third adjusting screw rod 31 is a stepped structure, which is successively a fixed section, a connecting section and a supporting section from top to bottom. The fixed section, the connecting section and the supporting section are all cylindrical structures, and the diameters of the fixed section, the connecting section and the supporting section increase successively. Among them, the outer surface of the fixed section is provided with threads for connecting the third fastening element 34. The diameter of the connecting section is the same as the diameter of the weight-reducing hole of the gear 5, so that the connecting section can pass through the weight-reducing hole of the gear 5. The top surface of the connecting section is an inclined surface which is adapted to the web of the gear 5.

[0055] A third adjusting screw 31 has a third elastic element 32 fixed to its bottom. The third elastic element 32 is made of a high-temperature resistant elastic material and has a certain elasticity. The third elastic element 32 is sleeved outside the connecting section, its bottom surface contacts the supporting section, and its top surface is an inclined surface, which is adapted to the large end face 10 of the gear web. The top surface of the third elastic element 32 is arranged facing the large end face 10 of the gear web, and the strain gauge 6 is placed between the third elastic element 32 and the large end face 10 of the gear web.

[0056] A third fastening element 34 is arranged on the fixed section of the third adjusting screw 31. The third fastening element 34 is a nut, and the third adjusting screw 31 is fixed to the gear 5 through the threaded connection between the nut and the third adjusting screw 31.

[0057] A first adjusting block 33 is sleeved on the fixed section of the third adjusting screw 31. The first adjusting block 33 is slidably connected to the third adjusting screw 31. The bottom surface of the first adjusting block 33 is an inclined surface, which is adapted to the small end face of the web of the gear 5, ensuring that the pressure applied during the baking and curing process remains constant.

[0058] A fifth anti-loosening element 35 is arranged between the third fastening element 34 and the first adjusting block 33. The fifth anti-loosening element 35 is a spring washer, which is used to prevent the third fastening element 34 from loosening during vibration or long-term use.

[0059] The third adjusting screw 31 is used to adjust the pressure applied by the pressing and fixing device to the strain gauge 6. By rotating the third adjusting screw 31, the third elastic element 32 is squeezed and the third elastic element 32 undergoes different degrees of deformation, realizing the adjustment of different pressing forces on the strain gauge 6.

[0060] The third elastic element 32 is the main load-bearing component of the pressing and fixing device, which is used to directly apply pressure to the strain gauge 6. The surface of the third elastic element 32 is finely processed to ensure that the contact surface with the strain gauge 6 is flat and smooth.

[0061] As Figure 8 and Figure 9 shown, the pressing device 4 at the small end face of the web includes fastening bolts 49. There are two fastening bolts 49, and the two fastening bolts 49 are respectively fixed in the weight-reducing holes of two adjacent gears 5. The fastening bolts 49 have the same structure as the third adjusting screw 31. A second adjusting block 44 and a third adjusting block 45 are sleeved on the fastening bolts 49. The bottom surface of the third adjusting block 45 contacts the small end face of the web, and the top surface of the second adjusting block 44 contacts the large end face of the web. A fourth fastening element 48 is arranged on the fastening bolts 49. The fourth fastening element 48 is a nut. A sixth anti-loosening element 46 is also arranged on the fastening bolts 49. The sixth anti-loosening element 46 is a spring washer, which is used to prevent the fourth fastening element 48 from loosening during vibration or long-term use.

[0062] Two adjacent fastening bolts 49 are connected by a support plate 43. A plurality of fourth adjusting screws 41 are threadedly connected to the support plate 43. There are a plurality of the fourth adjusting screws 41, and the plurality of fourth adjusting screws 41 are arranged side by side. One end of the fourth adjusting screw 41 is fixedly connected to a fifth knob, and the other end is fixedly connected to a fourth elastic element 42. The fourth elastic element 42 is supported by a high-temperature resistant elastic material and has a certain elasticity. The fourth elastic element 42 is disposed opposite to the small end face of the web of the gear 5. The strain gauge 6 is placed between the small end face of the web of the gear 5 and the fourth elastic element 42. By rotating the fourth adjusting screw 41 to move axially, the fourth elastic element 42 is extruded and the fourth elastic element 42 undergoes different degrees of deformation, so as to realize the adjustment of different pressing forces on the strain gauge 6.

[0063] A seventh anti-loosening element 47 is sleeved on the fourth adjusting screw 41. The bottom end of the seventh anti-loosening element 47 is connected to the support plate 43, and the top end of the seventh anti-loosening element 47 is connected to the fifth knob, so as to prevent the fourth adjusting screw 41 from loosening during vibration or long-term use by using the seventh anti-loosening element 47.

[0064] Embodiment 2

[0065] This embodiment provides a method for pressing and fixing a strain gauge, which uses a strain gauge pressing and fixing device as described in Embodiment 1, and includes the following steps:

[0066] Install the pressing device: Fix the pressing device 1 at the tooth root on the specified position of the gear 5 through the first fastening element 14 and the first fixing block 16, fix the pressing device 2 at the small end face on the specified position of the gear 5 through the second fastening element 24 and the second fixing block 26, fix the pressing device 3 at the large end face of the web on the specified position of the gear 5 through the third fastening element 34 and the third adjusting screw 31, and fix the pressing device 4 at the small end face of the web on the specified position of the gear 5 through the fourth fastening element 48 and the fastening bolt 49, to ensure that the pressing device 1 at the tooth root, the pressing device 2 at the small end face, the pressing device 3 at the large end face of the web, and the pressing device 4 at the small end face of the web are firmly connected to the gear 5;

[0067] Place the pressure sensor: Place the pressure sensor between the first elastic element 12, the second elastic element 22, the third elastic element 32, the fourth elastic element 42 and the surface of the gear 5 to measure the applied pressing force;

[0068] Rotate the adjusting screw: Rotate the first adjusting screw 11, the second adjusting screw 21, the third adjusting screw 31, and the fourth adjusting screw 41, and monitor the pressure value transmitted by the pressure sensor in real time. Continuously rotate the first adjusting screw 11, the second adjusting screw 21, the third adjusting screw 31, and the fourth adjusting screw 41 until the pressure value reaches the required pressure threshold;

[0069] Mark the positions of the adjusting screws: When the required pressure threshold is reached, mark the positions of the first adjusting screw 11, the second adjusting screw 21, the third adjusting screw 31, and the fourth adjusting screw 41 through the scale so that they can be accurately reset when the actual strain gauge 6 is pasted.

[0070] Remove the pressure sensor: Carefully remove the pressure sensor to avoid affecting the marked positions of the first adjusting screw 11, the second adjusting screw 21, the third adjusting screw 31, and the fourth adjusting screw 41. By calibrating the positions of the adjusting screws through the pressure sensor, quantitative adjustment of the pressure applied to the strain gauge 6 is achieved. This quantitative adjustment ability enables the operator to precisely control the pressure applied to the strain gauge 6, ensuring the consistency of the pasting and installation of the strain gauge 6, and avoiding data deviation of the strain gauge 6 caused by inappropriate pressure, thereby affecting the reliability of the test results.

[0071] Paste the strain gauge 6: When pasting the strain gauge 6, rotate the first adjusting screw 11, the second adjusting screw 21, the third adjusting screw 31, and the fourth adjusting screw 41 to the previously marked positions to ensure that the strain gauge 6 is subjected to an appropriate pressing force during the pasting process.

[0072] Through the above steps, the pressing device provided by the present invention can provide the required precise pressing force for the strain gauge 6 at each key part of the gear 5, ensuring that the strain gauge 6 can be stably and evenly attached to the surface of the gear 5 during the high-temperature baking process, and greatly improving the pasting quality of the strain gauge 6.

[0073] In summary, through its unique design and method, the present invention not only improves the quality of strain gauge pasting and the accuracy of stress test results, but also enhances the adaptability and reliability of the test system, bringing significant technological progress to the field of gear strength testing.

[0074] Although the specific implementation manners of the present invention are described above in conjunction with the drawings, it is not a limitation of the protection scope of the present invention. Those skilled in the art should understand that based on the technical solutions of the present invention, various modifications or deformations that can be made without creative efforts by those skilled in the art are still within the protection scope of the present invention.

Claims

1. A strain gauge pressing and fixing device, characterized in that A pressing device including a tooth root, an end face, and a spoke, wherein the spoke includes a large web end face and a small web end face; The pressing device at the tooth root includes a first fixing bracket, a first fastening assembly, and a first pressing assembly; The first fixing bracket includes a bearing plate, with a first fixing block provided at one end of the bearing plate and an installation plate formed by bending the other end; The first fastening assembly includes a first threaded rod and a first fastening block. The first threaded rod is installed on the installation plate, and the first fastening block is provided at the inner end of the first threaded rod. The first fixing block and the first fastening block are clamped at both ends of the gear; The first pressing assembly includes a first adjusting screw and a first elastic element. The first adjusting screw is installed on the bearing plate, and the first elastic element is provided at the inner end of the first adjusting screw for pressing and fixing the strain gauge pasted at the tooth root of the gear; The pressing device at the small end face, which includes a second fixing bracket, a second fastening assembly, and a second pressing assembly. The second fixing bracket includes two second side plates, and one of the second side plates is of a triangular structure; The pressing device at the large web end face includes a third adjusting screw, a third elastic element, and a third fastening element; The pressing device at the small web end face includes fastening bolts. There are two fastening bolts, and the two fastening bolts are fixed in the adjacent weight-reducing holes of the gear.

2. The strain gauge pressing and fixing device according to claim 1, wherein, The first fastening assembly further includes a first fastening element and a first anti-loosening element. The first fastening element is provided at the outer end of the first threaded rod, and the first anti-loosening element is installed between the installation plate and the first fastening element.

3. The strain gauge pressing and fixing device according to claim 1, characterized in that, The second fixing bracket includes a bearing plate, with a fixing plate formed by bending one end and an installation plate formed by bending the other end. A second fixing block is provided on the fixing plate; The second fastening assembly includes a second threaded rod and a second fastening block. The second threaded rod is installed on the installation plate, and the second fastening block is provided at the inner end of the second threaded rod. The second fixing block and the second fastening block are clamped at both ends of the gear; The second pressing assembly includes a second adjusting screw and a second elastic element. The second adjusting screw is installed on the fixing plate, and the second elastic element is provided at the inner end of the second adjusting screw for pressing and fixing the strain gauge pasted at the small end face of the gear.

4. The strain gauge pressing and fixing device according to claim 3, characterized in that, One end of the second adjusting screw is fixedly connected to a third knob, and the other end of the second adjusting screw is connected to a second elastic element.

5. The strain gauge pressing and fixing device according to claim 4, wherein, A second installation hole is provided at the end of the second fixing bracket away from the second adjusting screw, and a second fastening element is threadedly connected in the second installation hole.

6. The strain gauge pressing and fixing device according to claim 1, wherein The third adjusting screw is fixed on the weight-reducing hole of the gear. The third elastic element and the third fastening element are both installed on the third adjusting screw, and the third elastic element and the third fastening element are respectively located on both sides of the gear web. The third elastic element is disposed opposite to the large web end face of the gear for pressing and fixing the strain gauge pasted at the large web end face of the gear.

7. The strain gauge pressing and fixing device according to claim 6, wherein, A fifth anti-loosening element is threadedly installed on the upper part of the third adjusting screw, and a first adjusting block is provided below the fifth anti-loosening element. One end contour of the first adjusting block is adapted to the small web end face of the gear.

8. The strain gauge pressing and fixing device according to claim 1, characterized in that, The pressing device at the small end face of the web is used to press and fix the strain gauge posted at the small end face of the gear web.

9. The strain gauge pressing and fixing device according to claim 8, characterized in that, Adjacent two fastening bolts are connected by a support plate. A plurality of fourth adjusting screws are threadedly connected to the support plate. One end of the fourth adjusting screw is fixedly connected to a fifth knob, and the other end is fixedly connected to a fourth elastic element. The fourth elastic element is disposed facing the small end face of the gear web.

10. A method for pressing and fixing a strain gauge, which uses a strain gauge pressing and fixing device according to any one of claims 1-9, characterized in that, It includes the following steps: Fix the pressing device on the gear, and place a pressure sensor between the elastic element and the gear surface; Rotate the adjusting screw and monitor the pressure value of the pressure sensor in real time until the pressure value reaches the set pressure threshold. At this time, mark the position where the adjusting screw is located; Remove the pressure sensor, paste the strain gauge and rotate the adjusting screw to the previously marked position to complete the pressing and fixing of the strain gauge.

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