Strain gauge pressing and fixing device and method

Abstract

The invention relates to the technical field of strain gauge pasting, in particular to a strain gauge pressing and fixing device and method. The pressing and fixing device comprises a tooth root pressing device, and the tooth root pressing device comprises a first fixing support, a first fastening assembly and a first abutting assembly. The first fixing support comprises 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 comprises a first threaded rod and a first fastening block, the first threaded rod is mounted 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 to the two ends of the gear; the first abutting assembly comprises a first adjusting screw rod and a first elastic element, the first adjusting screw rod is installed on the bearing plate, and the first elastic element is arranged at the inner end of the first adjusting screw rod. According to the invention, the problems of inaccurate pressure control, low reliability of test results and the like in the prior art are solved.

Description

Technical Field

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

[0002] Strain gauges, also known as resistance strain gauges, are sensors used to measure stress changes on the surface of an object and are 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 essential for evaluating the load-bearing capacity of gears and predicting their fatigue life.

[0003] The installation process of strain gauges generally requires regular and quantitative pressing after applying special glue to ensure reliable bonding. High temperature resistant strain gauges require specific installation processes, which require precise and long-term pressing pressure and ambient temperature control process at specific ambient temperatures.

[0004] In the prior art, pressure is usually applied manually or by simple mechanical devices, but these methods are difficult to accurately control the applied pressure, and the consistency of the strain gauge pasting and installation is poor, which affects the accuracy of the stress test results; for strain gauges that have been in service for a long time, it is even more difficult to ensure the reliability of the stress test system. Summary of the invention

[0005] In view of the shortcomings 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 the gear, the pressure-applying devices for the tooth root, end face and spoke are designed respectively, which can adapt to certain gear structure changes and solve the problems of 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 the strain gauges at different key parts of the gear, ensure the gluing quality and reliability of the strain gauges in a high temperature environment, thereby achieving high-precision stress testing and improving the accuracy and reliability of gear strength testing.

[0006] In order to achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0007] A strain gauge pressing and fixing device comprises a pressure device at the tooth root, wherein the pressure device at the tooth root comprises a first fixing bracket, a first fastening assembly and a first pressing assembly; the first fixing bracket comprises 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 comprises a first threaded rod and a first fastening block, the first threaded rod is mounted 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 the two ends of the gear; the first pressing assembly comprises a first adjusting screw and a first elastic element, the first adjusting screw is mounted on the bearing plate, and the first elastic element is arranged at the inner end of the first adjusting screw, and is used to pressurize and fix the strain gauge affixed to the tooth root of the gear.

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

[0009] Optionally, it also includes a pressure-applying device at the end face of the small end, and the pressure-applying device at the end face of the small end includes a second fixed bracket, a second fastening assembly and a second pressing assembly; the second fixed bracket includes a bearing plate, one end of the bearing plate is bent to form a fixed plate, and the other end is bent to form a mounting plate, and a second fixing block is arranged on the fixing plate; the second fastening assembly includes a second threaded rod and a second fastening block, the second threaded rod is mounted on the mounting plate, the second fastening block is arranged at the inner end of the second threaded rod, and 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 mounted on the fixing plate, and the second elastic element is arranged at the inner end of the second adjusting screw, for applying pressure and fixing the strain gauge posted on the end face of the small end of the gear.

[0010] Optionally, 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.

[0011] Optionally, a second mounting hole is formed at one end of the second fixing bracket away from the second adjusting screw, and a second fastening element is threadedly connected to the inner surface of the second mounting hole.

[0012] Optionally, it also includes a pressure-applying device at the large end surface of the web, and the pressure-applying device at the large end surface 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-reducing hole of the gear, and 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, and the third elastic element is arranged opposite to the large end surface of the gear web, so as to apply pressure and fix the strain gauge attached to the large end surface of the gear web.

[0013] Optionally, a fifth anti-loosening element is threadedly mounted on the upper portion of the third adjusting screw, a first adjusting block is disposed below the fifth anti-loosening element, and a contour of one end of the first adjusting block is adapted to a small end face of the gear web.

[0014] Optionally, it also includes a pressure-applying device at the small end face of the web, which is used to pressurize and fix the strain gauge posted on the small end face of the gear web. The pressure-applying device at the small end face of the web includes a fastening bolt, and two fastening bolts are provided. The two fastening bolts are fixed in two adjacent gear weight-reducing holes.

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

[0016] An embodiment of the present invention also provides a strain gauge pressing and fixing method, which uses a strain gauge pressing and fixing device as described above, including the following steps: fixing a pressure device on a gear, and 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 a set pressure threshold, and marking the position of the adjusting screw 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 embodiments 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 designs pressure devices for the tooth root, end face and spoke respectively, and then cooperates with the strain gauge to conduct a full range of tests on the gear, covering the key stress-bearing area of ​​the gear, thereby providing more comprehensive stress data. In addition, the device can adapt to certain gear structural changes and can adapt to gears of different sizes and shapes, reducing the need to design different fixing devices for different gears, reducing the cost of tooling and auxiliary tools and improving efficiency. The improvement of the scope of application has high practical value in industrial applications.

[0019] The present invention adds a pressure quantitative adjustment structure, and realizes quantitative adjustment of the pressure applied to the strain gauge by calibrating the position of the adjustment screw in cooperation with the pressure sensor. This quantitative adjustment capability enables the operator to accurately control the pressure applied to the strain gauge, ensures the consistency of the strain gauge pasting and installation, and avoids the deviation of the strain gauge data due to inappropriate pressure, thereby affecting the reliability of the test results. By quantitatively adjusting the applied 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 elastic element design in the present invention ensures complete contact between the pressure surface and the strain gauge, achieving uniform pressure on the strain gauge. The risk of failure of the strain gauge due to uneven force is reduced. 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, and in part will become obvious from the following description, or will be learned through 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 the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In addition, the spacing or size between each other is exaggerated to show the position of each part, and the schematic diagram is only used for illustration.

[0023] Figure 1 This is a schematic diagram of the overall structure of the pressing and fixing device in the first embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the structure of the pressure-applying device at the tooth root in the first embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the connection between the pressure-applying device at the tooth root and the gear in the first embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of the structure of the pressure-applying device at the small end surface in the first embodiment of the present invention;

[0027] Figure 5 This is a schematic diagram of the connection between the pressure-applying device at the small end face and the gear in the first embodiment of the present invention;

[0028] Figure 6 This is a schematic structural diagram of a pressure-applying device at the large end surface of the web in Embodiment 1 of the present invention;

[0029] Figure 7 This is a schematic diagram of the connection between the pressure-applying device at the large end surface of the web and the gear in the first embodiment of the present invention;

[0030] Figure 8 This is a schematic diagram of the structure of the pressure-applying device at the small end surface of the web in the first embodiment of the present invention;

[0031] Fig. 9 This is a schematic diagram of the connection between the pressure-applying device at the small end surface of the web and the gear in the first embodiment of the present invention;

[0032] Fig.10 This is a schematic diagram of the top surface structure of a gear in Embodiment 1 of the present invention;

[0033] Fig.11 This is a schematic diagram of the bottom surface structure of a gear in Embodiment 1 of the present invention;

[0034] In the figure: 1. pressure device at the root of the tooth; 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 device at the end face of the small end; 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 plate; 31. the third adjusting screw; 32. the third elastic element; 33. the first adjusting block; 34. the third fastening element; 35. the fifth anti-loosening element; 4. Pressure-applying device at the small end face of the web; 41. the fourth adjusting screw; 42. the fourth elastic element; 43. the supporting plate; 44. the second adjusting block; 45. the third adjusting block; 46. the sixth anti-loosening element; 47. the seventh anti-loosening element; 48. the fourth fastening element; 49. the fastening bolt; 5. the gear; 6. the strain gauge; 7. the gear tooth root; 8. the small end face of the gear; 9. the small end face of the gear web; 10. the large end face of the gear web. DETAILED DESCRIPTION

[0035] It should be noted that the following detailed descriptions are illustrative and are 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 meanings as those commonly understood by those of ordinary skill in the art 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, it indicates 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 posted on the gear tooth root 7, the gear small end face 8, the gear web small end face 9, and the gear web large end face 10. Fig.10 and Fig.11 As shown, the small end face 9 of the gear web and the large end face 10 of the gear web are respectively the top face and the bottom face of the gear web.

[0037] Embodiment 1

[0038] A typical implementation of the present invention is as follows Figure 1As shown, a device for pressing and fixing a strain gauge 6 includes a pressure device 1 at a tooth root, a pressure device 2 at a small end face, a pressure device 3 at a large end face of a web, and a pressure device 4 at a small end face of the web, wherein the pressure device 1 at the tooth root is used to press and fix the strain gauge 6 posted at the tooth root of a gear 5, the pressure device 2 at the small end face is used to press and fix the strain gauge 6 posted at the small end face of the gear 5, the pressure device 3 at the large end face of the web is used to press and fix the strain gauge 6 posted at the large end face of the web of the gear 5, and the pressure device 4 at the small end face of the web is used to press and fix the strain gauge 6 posted 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 designs pressure devices for the tooth root, end face and spoke (large end face of the web and small end face of the web) respectively, and then cooperates with the strain gauge 6 to conduct a comprehensive test on the gear 5, covering the key stress-bearing area of ​​the gear 5, thereby providing more comprehensive stress data. In addition, the device can adapt to certain changes in the structure 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 auxiliary tools and improves efficiency. The improvement of the scope of application has high practical value in industrial applications.

[0040] Specifically, Figure 2 , Figure 3 As shown, the pressure-applying device 1 at the tooth root includes a first fixed bracket 13, which is U-shaped and includes a first side plate and a first connecting plate. Two first side plates are provided, 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 set angles with the first connecting plate, and a first fixed block 16 is provided at one end of one of the first side plates away from the first connecting plate, and a first mounting hole is provided on the other first side plate, and a first fastening element 14 is threadedly connected to the first mounting hole.

[0041] The first fastening element 14 includes a first threaded rod 17, which is threadedly connected to the first mounting hole. The first threaded rod 17 is arranged perpendicular to the first side plate. A first knob is arranged at one end of the first threaded rod 17, and a first fastening block 18 is arranged at the other end of the first threaded rod 17. The first fastening block 18 is arranged opposite to the first fixing block 16. The first knob is rotated to realize the movement of the first fastening block 18 along the axial direction of the first threaded rod 17 through the threaded connection between the first threaded rod 17 and the first mounting hole.

[0042] When in use, first use one of the first side panels and the first fixing block 16 on the first side panel to hook the outer edge of one end face of the gear 5, and move the other first side panel close to the other end face of the gear 5. Turn the first knob to move the first fastening block 18 toward the end face of the gear 5 and contact the end face of the gear 5, thereby fixing 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 contacts the first side plate, and the other end contacts the first knob. The first anti-loosening element 15 prevents the first fastening element 14 from loosening during vibration or long-term use.

[0044] A plurality of first adjusting screws 11 are threadedly connected on the first connecting plate, a second knob is provided at one end of the first adjusting screw 11, and a first elastic element 12 is rotatably connected to the other end of the first adjusting screw 11. The first elastic element 12 is arranged 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, thereby applying uniform pressure to the strain gauge 6.

[0045] The elastic element design ensures complete contact between the pressure surface and the strain gauge 6, and realizes uniform pressure on the strain gauge 6. The risk of failure of the strain gauge 6 due to uneven force is reduced. By ensuring uniform pressure on the strain gauge 6, 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 the performance of the gear 5.

[0046] The strain gauge 6 is arranged 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 move axially, squeeze the first elastic element 12 and cause the first elastic element 12 to deform to different degrees, so as to adjust the strain gauge 6 to different pressing strengths.

[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. The second anti-loosening element 19 is used to prevent the first adjusting screw 11 from loosening during vibration or long-term use.

[0048] like Figure 4 , Figure 5 As shown, the pressure-applying device 2 at the small end face includes a second fixed bracket 23, and the second fixed bracket 23 includes a second side plate and a second connecting plate. Two second side plates are provided, and the two second side plates are respectively located at the two ends of the second connecting plate and are at a set angle with the second connecting plate. One of the second side plates is a triangular structure, and second fixed blocks 26 are provided on both sides of its bottom. The second adjusting screw 21 is threadedly connected to the middle of its bottom. The third knob is fixedly connected to one end of the second adjusting screw 21, and the second elastic element 22 is connected to the other end of the second adjusting screw 21. The second elastic element 22 is made of a high-temperature resistant elastic material and has a certain elasticity. The other second side plate is provided with a second mounting hole, and the second fastening element 24 is threadedly connected to the inner thread of 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 arranged perpendicular to the second side plate. A fourth knob is arranged at one end of the second threaded rod 27, and a second fastening block 28 is arranged at the other end of the second threaded rod 27. The second fastening block 28 is arranged opposite to the second elastic element 22. By rotating the fourth knob, the second fastening block 28 is moved along the axial direction of the second threaded rod 27 through the threaded connection between the second threaded rod 27 and the second mounting hole.

[0050] When in use, first use one of the second side panels and the two second fixing blocks 26 on the second side panel to hook the outer edge of one end face of the gear 5, and move the other second side panel close to the other end face of the gear 5. Turn the fourth knob to move the second fastening block 28 toward the end face of the gear 5 and contact the end face of the gear 5, thereby fixing the second fixing bracket 23 on the gear 5.

[0051] At this time, the second elastic element 22 is arranged opposite to 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. The third knob is turned to drive the second adjusting screw 21 to move axially, squeeze the second elastic element 22 and cause the second elastic element 22 to deform to different degrees, thereby realizing the adjustment of different pressing strengths of 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. The third anti-loosening element 25 is used 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 outer side of the second adjusting screw 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. The fourth anti-loosening element 29 is used to prevent the second adjusting screw 21 from loosening during vibration or long-term use.

[0054] like Figure 6 and Figure 7 As shown, the pressure-applying device 3 at the large end surface of the web includes a third adjusting screw 31, and the third adjusting screw 31 is fixed on the weight-reducing hole of the gear 5. Specifically, the longitudinal section of the third adjusting screw 31 is a step-like structure, which includes 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, wherein a thread is provided on the outer surface of the fixed section for connecting a third fastening element 34, and 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, and the top surface of the connecting section is a slope, which is adapted to the web of the gear 5.

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

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

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

[0058] A fifth anti-loosening element 35 is provided between the third fastening element 34 and the first adjustment 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 deformed to different degrees, so that different pressing intensities of the strain gauge 6 can be adjusted.

[0060] The third elastic element 32 is the main bearing component of the pressing and fixing device, and 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] like Figure 8 and Fig. 9 As shown, the pressure-applying device 4 at the small end face of the web includes a fastening bolt 49, two of which are provided, and the two fastening bolts 49 are respectively fixed in the weight-reducing holes of two adjacent gears 5, and the fastening bolt 49 has the same structure as the third adjusting screw 31, and a second adjusting block 44 and a third adjusting block 45 are sleeved on the fastening bolt 49, and 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, and a fourth fastening element 48 is provided on the fastening bolt 49, and the fourth fastening element 48 adopts a nut, and a sixth anti-loosening element 46 is also provided on the fastening bolt 49, and 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, and a plurality of fourth adjusting screws 41 are threadedly connected to the support plate 43. There are a plurality of 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 the fifth knob, and the other end is fixedly connected to the 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 arranged opposite to the small end face of the web of the gear 5, and 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 squeezed and deformed to different degrees, so as to adjust the strain gauge 6 to different pressing strengths.

[0063] The fourth adjusting screw 41 is sleeved with a seventh anti-loosening element 47, 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 that the seventh anti-loosening element 47 can prevent the fourth adjusting screw 41 from loosening during vibration or long-term use.

[0064] Embodiment 2

[0065] This embodiment provides a method for pressing and fixing a strain gauge, using a strain gauge pressing and fixing device as described in the first embodiment, including the following steps:

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

[0067] Placing pressure sensors: placing pressure sensors 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. Continue to 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, the positions of the first adjusting screw 11, the second adjusting screw 21, the third adjusting screw 31, and the fourth adjusting screw 41 are marked with a ruler so that they can be accurately reset when the strain gauge 6 is actually 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. The position of the adjusting screw is calibrated by the pressure sensor, and the pressure applied to the strain gauge 6 is quantitatively adjusted. This quantitative adjustment capability enables the operator to accurately control the pressure applied to the strain gauge 6, ensuring the consistency of the installation of the strain gauge 6, and avoiding the deviation of the strain gauge 6 data due to inappropriate pressure, thereby affecting the reliability of the test results.

[0071] Pasting 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 appropriate pressing force during the pasting process.

[0072] Through the above steps, the pressure-applying device provided by the present invention can provide the required precise pressing force for the strain gauge 6 at each key position 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, thereby greatly improving the posting quality of the strain gauge 6.

[0073] In summary, the present invention, through its unique design and method, not only improves the quality of strain gauge posting 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 above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A strain gauge pressing and fixing device, characterized in that: It includes a tooth root pressure device, which includes a first fixing bracket, a first fastening assembly and a first pressing assembly; The first fixing bracket comprises a bearing plate, one end of which is provided with a first fixing block, and the other end of which is bent to form a mounting plate; The first fastening assembly comprises a first threaded rod and a first fastening block, the first threaded rod is mounted 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 mounted on the bearing plate. The first elastic element is arranged at the inner end of the first adjusting screw and is used to pressurize and fix the strain gauge attached to the gear tooth root.

2. The strain gauge pressing and fixing device according to claim 1, characterized in that: The first fastening assembly further includes a first fastening element and a first anti-loosening element. The first fastening element is arranged at the outer end of the first threaded rod, and the first anti-loosening element is installed between the mounting plate and the first fastening element.

3. The strain gauge pressing and fixing device according to claim 1, characterized in that: It also includes a pressure device at the end surface of the small end, and the pressure device at the end surface of the small end includes a second fixing bracket, a second fastening component and a second pressing component; The second fixing bracket comprises a bearing plate, one end of the bearing plate is bent to form a fixing plate, and the other end is bent to form a mounting plate, and a second fixing block is arranged on the fixing plate; The second fastening assembly comprises a second threaded rod and a second fastening block, the second threaded rod is mounted on the mounting plate, the second fastening block is arranged at the inner end of the second threaded rod, and 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 mounted on the fixing plate. The second elastic element is arranged at the inner end of the second adjusting screw and is used to press and fix the strain gauge attached to the end face of the small end of the gear.

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

5. A strain gauge pressing and fixing device as claimed in claim 4, characterized in that: A second mounting hole is formed at one end of the second fixing bracket away from the second adjusting screw, and a second fastening element is threadedly connected to the inner surface of the second mounting hole.

6. The strain gauge pressing and fixing device according to claim 1, characterized in that: It also includes a pressure-applying device at the large end surface of the web, and the pressure-applying device at the large end surface 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-reducing hole of the gear, and the third elastic element and the third fastening element are both installed on the third adjusting screw. The third elastic element and the third fastening element are respectively located on both sides of the gear web. The third elastic element is arranged opposite to the large end surface of the gear web, and is used to pressurize and fix the strain gauge attached to the large end surface of the gear web.

7. A strain gauge pressing and fixing device as claimed in claim 6, characterized in that: The upper thread of the third adjusting screw is threadably mounted with a fifth anti-loosening element, a first adjusting block is arranged below the fifth anti-loosening element, and the contour of one end of the first adjusting block is matched with the small end face of the gear web.

8. The strain gauge pressing and fixing device according to claim 1, characterized in that: It also includes a pressure-applying device at the small end face of the web, which is used to pressurize and fix the strain gauge posted on the small end face of the gear web. The pressure-applying device at the small end face of the web includes a fastening bolt, two of which are provided and fixed in two adjacent gear weight-reducing holes.

9. A strain gauge pressing and fixing device as claimed in claim 8, characterized in that: Two adjacent fastening bolts are connected by a support plate, and a plurality of fourth adjusting screws are threadedly connected to the support plate. One end of the fourth adjusting screw is fixedly connected to the fifth knob, and the other end is fixedly connected to the fourth elastic element. The fourth elastic element is arranged opposite to the small end face of the gear belly.

10. A method for pressing and fixing a strain gauge, using a device for pressing and fixing a strain gauge as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: The pressure-applying device is fixed on the gear, and a pressure sensor is placed 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 which point the position of the adjusting screw is marked; Remove the pressure sensor, stick 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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