High-locking nut test tool

Abstract

The utility model discloses a high-locking nut test tool, and belongs to the technical field of fastener detection. The tool comprises a supporting assembly, a pre-tightening force detection assembly, a test bolt, a rotation stopping assembly and a torque detection assembly, the pre-tightening force detection assembly is movably connected with the supporting assembly, one end, close to the head of the test bolt, of the test bolt is movably connected with the pre-tightening force detection assembly, and the other end of the test bolt penetrates through the supporting assembly. The rotation stopping assembly is movably connected with the head of the test bolt for rotation stopping, and one end of the torque detection assembly is connected with the end, away from the rotation stopping assembly, of the test bolt through a high-locking nut. After rotation stopping is carried out on the test bolt through the rotation stopping assembly, the test bolt does not rotate along with the high-locking nut when the high-locking nut is rotated, and the test efficiency and the test result accuracy of the high-locking nut are ensured.

Description

Technical Field

[0001] The utility model relates to a high-lock nut testing tool and belongs to the technical field of fastener detection. Background Art

[0002] In the aviation field, the demand for fasteners is very high. In order to prevent fasteners from failing in actual use, simulation tests are very important. As a nut with a very high frequency of use, the performance of high-lock nuts must be strictly controlled during production. However, when testing the locking torque, breaking torque, preload and loosening torque of high-lock nuts, it is often necessary to clamp them multiple times or use multiple sets of tooling, which is not only inconvenient to operate, but also has low test efficiency. In addition, repeated clamping of the same product will usually affect the accuracy of the test results.

[0003] The Chinese patent document with the publication number CN109506825A discloses a high-lock nut performance testing tool, a test bolt, and a sleeve assembly sleeved on the rod of the test bolt, the sleeve assembly includes a first sleeve and a second sleeve threaded together at opposite ends, a pressure sensor for detecting the axial preload of the process part of the high-lock nut when it is screwed off is sandwiched between the head of the test bolt and the sleeve assembly, and the opposite ends of the first sleeve and the second sleeve respectively constitute stop ends for cooperating with the pressure sensor and the high-lock nut stop. The pressure sensor measures the axial pressure, and the axial pressure when the process part of the high-lock nut is screwed off is the axial preload; thereafter, the first sleeve and the second sleeve can be screwed in relative to each other to eliminate the axial preload, and the loosening torque can be measured using a testing machine. The use of this testing tool can first detect the axial preload, and then does not affect the detection of the loosening torque, thereby realizing the detection of multiple performance parameters.

[0004] However, during the testing process of the high-lock nut performance testing tool, when the high-lock nut is rotated relative to the test bolt, the test bolt is likely to rotate along with the high-lock nut, resulting in reduced test efficiency and accuracy of test results. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a high-lock nut test tool.

[0006] The utility model is realized through the following technical solutions:

[0007] A high-locking nut testing tool comprises a supporting assembly, a preload detection assembly, a test bolt, a rotation-stop assembly and a torque detection assembly, wherein the preload detection assembly is movably connected to the supporting assembly, one end of the test bolt close to its head is movably connected to the preload detection assembly, and the other end passes through the supporting assembly, the rotation-stop assembly is movably connected to the head of the test bolt for rotation stop, and one end of the torque detection assembly is connected to an end of the test bolt away from the rotation-stop assembly through a high-locking nut.

[0008] The support assembly includes a support block A, a support block B, a gasket and multiple support bolts. The support block A is cylindrical, and a through hole A is coaxially provided on the support block A, and multiple blind holes A are evenly distributed on the end surface of one end of the support block A. The support block B is cylindrical and is coaxially arranged with the support block A. A through hole C is coaxially provided on the support block B, and multiple threaded holes are evenly distributed on the support block B. The gasket is located on the side of the support block B away from the support block A. The multiple support bolts are threadedly connected to the multiple threaded holes on the support block B in a one-to-one correspondence, and one ends of the multiple support bolts are inserted into the multiple blind holes A on the support block A in a one-to-one correspondence.

[0009] The preload force detection assembly includes a sleeve and a pressure sensor. The sleeve is a stepped shaft, and its longitudinal cross-section is T-shaped. A blind hole B is coaxially provided on the sleeve, and a through hole B is coaxially provided on the bottom surface of the blind hole B. The pressure sensor is mounted on the sleeve, and the pressure sensor is located between the support assembly and the shaft shoulder on the sleeve.

[0010] The anti-rotation assembly comprises a mid-flight sleeve and a rotation-limiting rod, and one end of the rotation-limiting rod is movably connected to one end of the mid-flight sleeve.

[0011] One end of the middle flying sleeve is provided with a regular hexagonal groove A, and the other end is provided with a square groove.

[0012] One end of the rotation-limiting rod is provided with a square boss, and the other end is provided with a regular hexagonal boss.

[0013] The anti-rotation assembly also includes an anti-rotation chuck, which clamps an end of the rotation-limiting rod away from the mid-flight sleeve.

[0014] The torque detection assembly comprises a transmission shaft, a torque sensor is installed in the middle of the transmission shaft, and a torque transmission sleeve is arranged at one end of the transmission shaft.

[0015] A regular hexagonal groove B is provided at one end of the torque transmission sleeve.

[0016] The torque detection assembly also includes an active chuck, which clamps an end of the transmission shaft away from the torque transmission sleeve.

[0017] The beneficial effect of the utility model is that after the test bolt is stopped from rotating by the anti-rotation assembly, the test bolt will not rotate along with the high-locking nut when the high-locking nut is rotated, thereby ensuring the test efficiency of the high-locking nut and the accuracy of the test result. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the support block A of the utility model;

[0020] Figure 3 It is a cross-sectional view of the mid-flight sleeve of the utility model;

[0021] Figure 4 for Figure 3 Left view of

[0022] Figure 5 for Figure 3 Right view of;

[0023] Figure 6 It is a structural schematic diagram of the sleeve of the utility model;

[0024] Figure 7 It is a structural schematic diagram of the rotation-limiting rod of the utility model;

[0025] Figure 8 It is a structural schematic diagram of the support block B of the utility model.

[0026] In the figure: 1-support block A, 100-through hole A, 101-blind hole A, 2-test bolt, 3-mid-fly sleeve, 30-regular hexagonal groove A, 31-square groove, 4-anti-rotation chuck, 5-rotation limiting rod, 50-square boss, 51-regular hexagonal boss, 6-sleeve, 60-blind hole B, 61-through hole B, 7-pressure sensor, 8-support block B, 80-through hole C, 81-threaded hole, 9-support bolt, 10-active chuck, 11-torque sensor, 12-torque transmission sleeve, 13-high lock nut, 14-drive shaft, 15-gasket. DETAILED DESCRIPTION

[0027] The technical solution of the utility model is further described below, but the scope of protection required is not limited to the description.

[0028] like Figures 1 to 8As shown, a high locking nut test fixture described in the utility model includes a support component, a preload detection component, a test bolt 2, a rotation stop component and a torque detection component, wherein the preload detection component is movably connected to the support component, one end of the test bolt 2 close to its head is rotationally connected to the preload detection component, and the other end passes through the support component, the rotation stop component is movably connected to the head of the test bolt 2 to stop rotation, and one end of the torque detection component is connected to the end of the test bolt 2 away from the rotation stop component through the high locking nut 13. When in use, the test bolt 2 is stopped by the rotation stop component, the high locking nut 13 is rotated relative to the test bolt 2 by the torque detection component, and the locking torque, breaking torque and loosening torque of the high locking nut 13 are detected by the torque detection component in the process, and the axial preload of the high locking nut 13 is detected by the preload detection component. After the test bolt 2 is stopped by the rotation stop component, the test bolt 2 will not rotate with the high locking nut 13 when the high locking nut 13 is rotated, thereby ensuring the test efficiency and test result accuracy of the high locking nut 13.

[0029] The support assembly includes a support block A1, a support block B8, a gasket 15 and four support bolts 9. The support block A1 is cylindrical, a through hole A100 is coaxially provided on the support block A1, and four blind holes A101 are evenly distributed on one end surface of the support block A1. The support block B8 is cylindrical and coaxially arranged with the support block A1. A through hole C80 is coaxially provided on the support block B8, and four threaded holes 81 are evenly distributed on the support block B8. The gasket 15 is located on the side of the support block B8 away from the support block A1. The four support bolts 9 are threadedly connected with the four threaded holes 81 on the support block B8 in a one-to-one correspondence, and one end of the four support bolts 9 is inserted into the multiple blind holes A101 on the support block A1 in a one-to-one correspondence. When in use, the small end of the sleeve 6 is inserted into the through hole A100 and is gap-matched with the through hole A100. The diameter of the through hole C80 is consistent with the diameter of the through hole A100. The inner hole diameter of the gasket 15 is slightly larger than the diameter of the middle part of the test bolt 2. The ends of the four support bolts 9 away from the head are inserted into the four blind holes A101 on the support block A1 one by one, and the support bolts 9 and the blind holes A101 are clearance-matched. The parallelism of the end faces of the gasket 15 at both ends is not greater than 0.1mm, and the surface roughness is not greater than Ra1.6. The gasket 15 is used to limit the axial movement of the high lock nut 13 during the test, so that the test bolt 2 can transmit the axial force to the pressure sensor 7 through the sleeve 6. The end of the test bolt 2 away from the head passes through the through hole B61, the through hole A100, the through hole C80 and the inner hole of the gasket 15 in sequence.

[0030] The preload force detection assembly includes a sleeve 6 and a pressure sensor 7. The sleeve 6 is a stepped shaft with a T-shaped longitudinal section. A blind hole B60 is coaxially provided on the sleeve 6, and a through hole B61 is coaxially provided on the bottom surface of the blind hole B60. The pressure sensor 7 is sleeved on the sleeve 6, and the pressure sensor 7 is located between the support assembly and the shoulder on the sleeve 6. When in use, the end of the test bolt 2 close to its head is in clearance fit with the through hole B61. The pressure sensor 7 is located between the support block A1 and the shoulder on the sleeve 6.

[0031] The anti-rotation assembly comprises a mid-flight sleeve 3 and a rotation-limiting rod 5 , one end of the rotation-limiting rod 5 is slidably connected to one end of the mid-flight sleeve 3 .

[0032] One end of the mid-flight sleeve 3 is provided with a regular hexagonal groove A30, and the other end is provided with a square groove 31. When in use, the regular hexagonal groove A30 on the mid-flight sleeve 3 is used to cover the head of the test bolt 2 to stop the test bolt 2 from rotating.

[0033] One end of the rotation-limiting rod 5 is provided with a square boss 50, and the other end is provided with a regular hexagonal boss 51. When in use, the square boss 50 on the rotation-limiting rod 5 is matched with the square groove 31 on the middle flight sleeve 3, and after the square boss 50 on the rotation-limiting rod 5 is inserted into the square groove 31 on the middle flight sleeve 3, the middle flight sleeve 3 is stopped from rotating; the regular hexagonal boss 51 on the rotation-limiting rod 5 is used as a clamping section of the anti-rotation chuck 4 to prevent the rotation-limiting rod 5 from rotating relative to the anti-rotation chuck 4.

[0034] The anti-rotation assembly also includes an anti-rotation chuck 4, which clamps an end of the rotation-limiting rod 5 away from the mid-flight sleeve 3. When in use, the anti-rotation chuck 4 is fixed.

[0035] The torque detection assembly includes a transmission shaft 14 , a torque sensor 11 is installed in the middle of the transmission shaft 14 , and a torque transmission sleeve 12 is provided at one end of the transmission shaft 14 .

[0036] One end of the torque transmission sleeve 12 is provided with a regular hexagonal groove B. When in use, the regular hexagonal groove B on the torque transmission sleeve 12 is used to sleeve the high lock nut 13.

[0037] The torque detection assembly further includes an active chuck 10, which clamps an end of the transmission shaft 14 away from the torque transmission sleeve 12. To prevent the transmission shaft 14 from rotating relative to the active chuck 10, the clamping section of the transmission shaft 14 clamped by the active chuck 10 can also be processed into a regular hexagon.

[0038] The working principle of the high lock nut test tool described in the utility model is as follows:

[0039] like Figure 1As shown, the anti-rotation chuck 4 is fixed, and the anti-rotation chuck 4 clamps the regular hexagonal boss 51 on the limiting rod 5 to stop the rotation of the limiting rod 5; the square boss 51 on the limiting rod 5 is inserted into the square groove 31 on the middle flight sleeve 3 to stop the rotation of the middle flight sleeve 3; the regular hexagonal groove A30 on the middle flight sleeve 3 covers the head of the test bolt 2 to stop the rotation of the test bolt 2.

[0040] The active chuck 10 is installed on the main shaft of the machine tool. The main shaft of the machine tool transmits the torque to the high lock nut 13 threadedly connected with the test bolt 2 through the active chuck 10, the transmission shaft 14, the torque sensor 11 and the torque transmission sleeve 12, so that the high lock nut 13 rotates relative to the test bolt 2. When the high lock nut 13 rotates a certain number of times, the maximum torque detected by the torque sensor 11 in this process is used as the locking torque of the high lock nut 13. Continue to rotate the high lock nut 13. When the high lock nut 13 contacts the gasket 15 and the gasket 15 contacts the support block B8, the torque begins to increase sharply until the high lock nut 13 breaks at the twisting groove. The maximum torque detected by the torque sensor 11 in this process is used as the twisting torque of the high lock nut 13; at this time, there is an axial force between the test bolt 2 and the high lock nut 13, and the axial force is transmitted to the pressure sensor 7 through the sleeve 6. The axial force detected by the pressure sensor 7 at this time is used as the preload force of the high lock nut 13.

[0041] After completing the above test of the high-locking nut 13, rotate the supporting bolt 9 counterclockwise to remove the axial force between the test bolt 2 and the high-locking nut 13, and then reverse the machine tool spindle to loosen the high-locking nut 13. The maximum torque detected by the torque sensor 11 in this process is used as the loosening torque of the high-locking nut 13.

Claims

1. A high lock nut test tool, characterized in that: The invention comprises a support component, a preload detection component, a test bolt (2), a rotation-stop component and a torque detection component. The preload detection component is movably connected to the support component. One end of the test bolt (2) close to its head is movably connected to the preload detection component, and the other end passes through the support component. The rotation-stop component is movably connected to the head of the test bolt (2) to stop rotation. One end of the torque detection component is connected to the end of the test bolt (2) away from the rotation-stop component via a high locking nut (13).

2. The high locking nut test tool as claimed in claim 1, characterized in that: The support assembly comprises a support block A (1), a support block B (8), a gasket (15) and a plurality of support bolts (9); the support block A (1) is cylindrical, a through hole A (100) is coaxially provided on the support block A (1), and a plurality of blind holes A (101) are evenly distributed on one end surface of the support block A (1); the support block B (8) is cylindrical and is coaxially arranged with the support block A (1); a through hole C (80) is coaxially provided on the support block B (8), and a plurality of threaded holes (81) are evenly distributed on the support block B (8); the gasket (15) is located on a side of the support block B (8) away from the support block A (1); the plurality of support bolts (9) are threadedly connected to the plurality of threaded holes (81) on the support block B (8) in a one-to-one correspondence, and one end of the plurality of support bolts (9) is inserted into the plurality of blind holes A (101) on the support block A (1) in a one-to-one correspondence.

3. The high locking nut test tool as claimed in claim 1, characterized in that: The preload force detection assembly comprises a sleeve (6) and a pressure sensor (7); the sleeve (6) is a stepped shaft, and its longitudinal cross-section is T-shaped; a blind hole B (60) is coaxially provided on the sleeve (6), and a through hole B (61) is coaxially provided on the bottom surface of the blind hole B (60); the pressure sensor (7) is sleeved on the sleeve (6), and the pressure sensor (7) is located between the support assembly and the shaft shoulder on the sleeve (6).

4. The high locking nut test tool as claimed in claim 1, characterized in that: The anti-rotation assembly comprises a mid-flight sleeve (3) and a rotation-limiting rod (5), and one end of the rotation-limiting rod (5) is movably connected to one end of the mid-flight sleeve (3).

5. The high locking nut test tool as claimed in claim 4, characterized in that: One end of the mid-fly sleeve (3) is provided with a regular hexagonal groove A (30), and the other end is provided with a square groove (31).

6. The high locking nut test tool as claimed in claim 4, characterized in that: One end of the rotation-limiting rod (5) is provided with a square boss (50), and the other end is provided with a regular hexagonal boss (51).

7. The high locking nut testing tool as claimed in claim 4, characterized in that: The anti-rotation assembly also includes an anti-rotation chuck (4), which clamps an end of the rotation-limiting rod (5) away from the mid-flight sleeve (3).

8. The high locking nut testing tool as claimed in claim 1, characterized in that: The torque detection assembly comprises a transmission shaft (14), a torque sensor (11) is installed in the middle of the transmission shaft (14), and a torque transmission sleeve (12) is provided at one end of the transmission shaft (14).

9. The high locking nut testing tool as claimed in claim 8, characterized in that: One end of the torque transmission sleeve (12) is provided with a regular hexagonal groove B.

10. The high locking nut testing tool as claimed in claim 8, characterized in that: The torque detection assembly also includes an active chuck (10), which clamps an end of the transmission shaft (14) away from the torque transmission sleeve (12).

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