Rivet nut hardness testing equipment

Abstract

The invention relates to the technical field of nut hardness testing, in particular to rivet nut hardness testing equipment which comprises a hardness tester body, the hardness tester body comprises a base and a diamond cone testing pressure head, and a lifting seat is fixedly mounted at the upper end of the base; the hardness tester has the beneficial effects that the hardness testing mechanism is eccentrically mounted on the hardness testing table top of the hardness tester body, the pressing rivet nut is placed in a limiting manner, and the position of the limiting rotating frame ring is moved by swinging the swinging convex plate, so that the variable-diameter moving assembly is triggered to adjust the position size of the pressing rivet nut reserved in the center; the eccentric annular frame seat and the upper protective plate are integrally rotated, so that hardness tests of different positions of the nut are met while adaptive limiting of the pressing rivet nut is met, repeated measurement and averaging of the nut are realized, the position of the nut does not need to be manually and frequently replaced during operation, the automation degree is high, and the operation burden of workers is relieved.

Description

Technical Field

[0001] The invention relates to the technical field of nut hardness testing, in particular to a device for testing the hardness of a riveted nut. Background Art

[0002] The hardness test equipment for self-clinching nuts is mainly used to measure the hardness of self-clinching nuts to ensure that they meet specific quality requirements. This equipment is of great significance in the manufacturing industry. A hardness tester is used to measure the hardness of self-clinching parts to evaluate their wear resistance and pressure resistance. The hardness test equipment for self-clinching nuts is usually based on testing principles such as Rockwell hardness, Brinell hardness or Vickers hardness. It measures the indentation depth or area on the surface of the nut by applying a certain pressure or force, thereby calculating the hardness value of the nut.

[0003] In the prior art, a hardness tester with publication number CN220270995U includes a support body, a hardness testing device, and a lifting platform, which is arranged in the middle of the inner cavity of the support body and located below the hardness testing device, and a driving device, which is located in the middle of the inner cavity of the lifting platform and is used to drive the clamping plate to clamp and limit the metal. The pull ring can be pulled to pull the limit column out of the inner cavity of the limit hole, so that the clamping plate can be changed into a different shape, so that the shape of the clamping plate can be changed according to the shape of the metal material to be tested for hard objects.

[0004] Although the problem of being unable to adapt to metal parts of different shapes for limited clamping has been solved, the existing technology uses a method of controlling four groups of clamping plates to adapt to movement. However, in actual use, for special parts with a round hole or a threaded hole in the center, the hardness tester needs to manually adjust the center hole of the workpiece to one side of the pressure head before measuring, and often a single group of measurement data is not accurate enough. If multiple tests are required, the position of the workpiece needs to be adjusted manually back and forth, which is cumbersome and the experimental data is not accurate enough.

[0005] Therefore, the present invention proposes a self-clinching nut hardness testing device to solve the problem that the existing hardness testing equipment does not have the ability to perform multiple and automated hardness measurements on different positions of the workpiece, resulting in easy deviations in experimental data. The self-clinching nut measuring position can be automatically adjusted without the need for frequent manual operations, thus saving operating steps, reducing the burden on staff, and providing high accuracy in experimental data. Summary of the invention

[0006] The purpose of the present invention is to provide a self-clinching nut hardness testing device to solve the problems raised in the above background technology.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a kind of riveted nut hardness testing equipment, including a hardness tester body, the hardness tester body including a base and a diamond cone test indenter, a lifting seat is fixedly installed on the upper end of the base, and the upper end of the lifting seat is movably connected with a hardness testing table, and an operating cavity and a receiving cavity are respectively provided on the inner walls at both ends of the lifting seat, and the lower end of the hardness testing table is coaxially connected with a table lifting connecting rod, and the outer surface of the table lifting connecting rod is slidably connected with the inner wall of the receiving cavity, an eccentric circular groove is provided on the inner wall of the upper end of the hardness testing table, and a hardness testing mechanism is arranged on the inner side of the eccentric circular groove, and the hardness testing mechanism includes an eccentric annular frame seat, a fixed limiting circular plate, a limiting rotating frame ring and an upper guard plate, and a swing convex plate is fixedly connected to one side of the limiting rotating frame ring.

[0008] Preferably, a side boss is fixedly connected to one side of the hardness testing table, and the side boss is configured as a parallel plate integrally formed with the hardness testing table. A avoidance groove is provided at the connection position between the side boss and the hardness testing table, and a driving motor is fixedly connected to the lower end of the side boss, and a rotating gear is fixedly connected to the output shaft of the driving motor.

[0009] Preferably, the eccentric annular frame seat is movably mounted inside the eccentric circular groove, and an outer ring surface of the eccentric annular frame seat is fixedly connected to an engaging gear ring, and an outer surface of one side of the engaging gear ring engages and rotates with an outer surface of the rotating gear.

[0010] Preferably, the fixed limiting circular plate is fixedly mounted on the inner bottom surface of the eccentric annular frame seat, and the fixed limiting circular plate is a hexagonal plate-shaped structure. A reserved circular groove is provided on the central axis of the fixed limiting circular plate, and the reserved circular groove is used for placing the rivet nut. A hexagonal groove is provided on the outer side of the reserved circular groove, and the hexagonal groove is provided on the inner wall of the upper end of the fixed limiting circular plate, and a variable diameter moving component is provided on the inner side of the hexagonal groove.

[0011] Preferably, the variable diameter moving assembly includes a limit slider movably mounted on the inner surface of the hexagonal groove, the upper end of the limit slider is fixedly connected with an equally divided triangular limit plate, and the equally divided triangular limit plate is movably mounted on the upper end of the fixed limit circular plate.

[0012] Preferably, the lower end of the limit rotation frame ring is movably connected to the inner bottom surface of the eccentric annular frame seat, the upper inner ring of the limit rotation frame ring is provided with an inner ring plate, the inner ring plate and the limit rotation frame ring are coaxially distributed, the outer ring surface of the limit rotation frame ring is fixedly connected to the inner ring surface of the inner ring plate with connecting oblique rods, and the connecting oblique rods are provided in six groups and are arranged in a circular array about the central axis of the inner ring plate.

[0013] Preferably, a limiting ring groove is provided on the inner wall of the connecting oblique rod, a circular boss is movably connected to the inner surface of the limiting ring groove, and the circular boss is fixedly mounted on the upper end surface of the equally divided triangular limiting plate.

[0014] Preferably, the upper guard plate is fixedly mounted on the upper end of the eccentric annular frame seat, an arc-shaped groove is opened on the inner wall of one side of the upper guard plate, and an adaptive inner arc-shaped tooth edge is fixedly provided on the inner surface of the arc-shaped groove.

[0015] Preferably, a side reserved groove is opened on one side of the upper guard plate, the swinging protrusion is movably installed on the inner side of the side reserved groove, the upper end of the swinging protrusion is fixedly connected with a guide rod, the cross-section of the guide rod is a "T"-shaped structure, the outer surface of the guide rod is slidably connected with a push plate, one end of the push plate is fixedly connected with a locking tooth block, and the outer surface of the locking tooth block is movably engaged with the outer surface of the inner arc-shaped tooth edge.

[0016] Preferably, a return spring is fixedly connected to the lower end of the push plate, the other end of the return spring is fixedly connected to the upper surface of the swing convex plate, and the return spring is slidably sleeved on the lower outer surface of the guide rod.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The present invention proposes a self-rivet nut hardness testing device, in which a hardness testing mechanism is eccentrically installed on a hardness testing table, the self-rivet nut is limitedly placed, and the position of the limit rotating frame ring is moved by swinging the swinging convex plate, so that the variable diameter moving component is triggered, and the size of the center reserved self-rivet nut position is adjusted, and the eccentric annular frame seat and the overall rotation of the upper guard plate are coordinated to meet the self-rivet nut adaptation limit while also meeting the hardness test of different positions of the nut, realizing multiple measurements of the nut and taking an average value, and there is no need to manually change the nut position frequently during operation, with a high degree of automation, reducing the operating burden of the staff, and further solving the problem that the existing hardness testing equipment does not have the ability to perform multiple and automatic hardness measurements of different positions of the workpiece, resulting in easy deviations in experimental data. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 It is a schematic diagram of the three-dimensional structure of the hardness tester body of the present invention; Figure 2 It is a schematic diagram of the connection structure between the half-section of the lifting seat of the present invention and the hardness testing table; Figure 3 It is a schematic diagram of a half-section structure of the hardness tester body of the present invention; Figure 4 It is a schematic diagram of the connection structure between the lifting seat and the hardness testing table of the present invention; Figure 5 For the present invention Figure 4 A schematic diagram of the enlarged structure at point A; Figure 6 It is a schematic diagram of the disassembled structure of the hardness testing mechanism and the hardness testing table of the present invention; Figure 7 It is a schematic diagram of a half-section structure of the connection between the hardness testing table and the hardness testing mechanism of the present invention; Figure 8 For the present invention Figure 7 A schematic diagram of the enlarged structure at B; Fig. 9 This is a schematic diagram of the structure of the self-clinching nut of the present invention in a placed state viewed from above; Fig.10 It is a schematic diagram of the connection structure between the variable diameter moving assembly and the hardness testing table of the present invention; Fig.11 It is a schematic diagram of the exploded structure of the equally divided triangular limiting plate and the fixed limiting circular plate of the present invention; Fig.12 It is a schematic diagram of the partial cross-section structure of the equally divided triangular limiting plate of the present invention.

[0018] In the figure: 1. Hardness tester body; 11. Diamond cone test indenter; 12. Lifting seat; 120. Operating chamber; 1200. Accommodating chamber; 121. Manual rotating rod; 122. Conical gear 1; 123. Conical gear 2; 124. Threaded rod; 2. Hardness test table; 21. Table lifting connecting rod; 22. Side boss; 20. Eccentric circular groove; 3. Hardness test mechanism; 31. Eccentric annular frame seat; 311. Driving motor; 312. Rotating gear; 313. Engaging gear ring; 32. Fixed limiting circular plate ; 320, hexagonal groove; 321, equally divided triangular limit plate; 322, circular convex column; 323, limit slider; 3210, buffer groove; 3211, elastic block; 3212, side touch plate of rivet nut; 33, limit rotation frame ring; 331, inner ring plate; 332, connecting oblique rod; 3320, limit ring groove; 34, upper guard plate; 340, arc groove; 341, inner arc tooth edge; 35, swing convex plate; 351, guide rod; 352, push plate; 3521, locking tooth block; 353, reset spring. DETAILED DESCRIPTION

[0019] In order to make the purpose and technical solution of the present invention clearly and completely described, and the advantages more clearly understood, the embodiments of the present invention are further described in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, rather than all of the embodiments, and are only used to explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] For example, see Figure 1-Figure 12The present invention provides a technical solution: a pressure riveted nut hardness testing device, comprising a hardness tester body 1, the hardness tester body 1 comprises a base and a diamond cone test indenter 11, a lifting seat 12 is fixedly installed on the upper end of the base, and a hardness test table 2 is movably connected to the upper end of the lifting seat 12, and an operating cavity 120 and a receiving cavity 1200 are respectively opened on the inner walls of both ends of the lifting seat 12, and a table lifting connecting rod 21 is coaxially connected to the lower end of the hardness test table 2, and the table lifting connecting rod The outer surface of the hardness test table 21 is slidably connected to the inner wall of the accommodating cavity 1200, an eccentric circular groove 20 is opened on the inner wall of the upper end of the hardness test table 2, and a hardness testing mechanism 3 is arranged on the inner side of the eccentric circular groove 20, and the hardness testing mechanism 3 includes an eccentric annular frame seat 31, a fixed limiting circular plate 32, a limiting rotating frame ring 33 and an upper guard plate 34, and a swinging convex plate 35 is fixedly connected to one side of the limiting rotating frame ring 33; a side boss 22 is fixedly connected to one side of the hardness test table 2, and the side boss 22 is arranged The side boss 22 is a parallel plate integrally formed with the hardness test table 2. The portion where the side boss 22 is connected to the hardness test table 2 is provided with an avoidance groove. The lower end of the side boss 22 is fixedly connected to a driving motor 311, and a rotating gear 312 is fixedly connected to the output shaft of the driving motor 311. The eccentric annular frame seat 31 is movably mounted inside the eccentric circular groove 20. The outer ring surface of the eccentric annular frame seat 31 is fixedly connected to a meshing gear ring 313. The outer surface of one side of the meshing gear ring 313 is connected to the rotating gear 312. The outer surface of the lifting seat 12 is meshed and rotated; a manual rotating rod 121 is rotatably installed on the inner wall of the base, one end of the manual rotating rod 121 is fixedly connected to a bevel gear 122, the upper outer surface of the bevel gear 122 is meshed and rotated with a bevel gear 2 123, the central inner surface of the bevel gear 2 123 is fixedly connected to a threaded rod 124, the outer surface of the threaded rod 124 is rotatably connected to the inner wall of the lifting seat 12, and the upper outer surface of the threaded rod 124 is threadedly connected to the inner wall of the lower end of the table lifting connecting rod 21; In this embodiment, refer to Figure 2-3As shown, when it is necessary to perform a hardness test on the rivet nut, the rivet nut to be tested is placed at the center of the eccentric circular groove 20 which is deviated from the center position of the hardness testing table 2. In this way, when the rivet nut is in contact with the diamond cone test indenter 11 for hardness testing, the central threaded hole of the rivet nut is avoided to ensure the accuracy of the hardness measurement; and by rotating the eccentric annular frame 31, the rivet nut with the center limit is rotated about the central axis of the eccentric circular groove 20, so as to ensure that the rivet nut can achieve hardness measurement at different positions; It should be noted that when the hardness test of the nut to be measured is performed, the operator The bevel gear 122 is held by hand and rotated, thereby driving the bevel gear 122 to rotate, so that the bevel gear 123 is adapted to mesh with the bevel gear 122, and the threaded rod 124 rotates at this time. Under the action of the threaded adaptation of the table lifting connecting rod 21 and the threaded rod 124, the hardness testing table 2 is lifted, so that the rivet nut is in contact with the lower end of the diamond cone test indenter 11, and then multiple groups of hardness tests are performed, and the average value of the multiple groups of test results is taken, so that the hardness of the rivet nut is accurately tested, and the whole operation does not require frequent manual adjustments, and the degree of automation is high.

[0021] Embodiment 2. On the basis of embodiment 1, in order to achieve the limiting of rivet nuts of different sizes, this embodiment proposes that a fixed limiting circular plate 32 is fixedly mounted on the inner bottom surface of the eccentric annular frame seat 31, and the fixed limiting circular plate 32 is a hexagonal plate-like structure. A reserved circular groove is provided on the central axis of the fixed limiting circular plate 32, and the reserved circular groove is used to place the rivet nut. A hexagonal groove 320 is provided on the outer side of the reserved circular groove. The hexagonal groove 320 is provided on the inner wall of the upper end of the fixed limiting circular plate 32, and a variable diameter moving component is provided on the inner side of the hexagonal groove 320; the variable diameter moving component includes a limiting slider 323 movably mounted on the inner surface of the hexagonal groove 320, and the upper end of the limiting slider 323 is fixedly connected with an equally divided triangular limiting plate 321, and the equally divided triangular limiting plate 321 is movably mounted on the upper end of the fixed limiting circular plate 32. The lower end of the limited rotation frame ring 33 is movably connected to the inner bottom surface of the eccentric annular frame seat 31, and the upper inner ring of the limited rotation frame ring 33 is provided with an inner ring plate 331, and the inner ring plate 331 and the limited rotation frame ring 33 are coaxially distributed. The outer ring surface of the limited rotation frame ring 33 and the inner ring surface of the inner ring plate 331 are fixedly connected with connecting oblique rods 332, and the connecting oblique rods 332 are provided with six groups and are arranged in a circular array about the central axis of the inner ring plate 331; the inner wall of the connecting oblique rod 332 is provided with a limited ring groove 3320, and the inner surface of the limited ring groove 3320 is movably connected with a circular boss 322, and the circular boss 322 is fixedly installed on the upper end surface of the equally divided triangular limit plate 321; In this embodiment, if Figure 4-Figure 10As shown, six groups of equally divided triangular limiting plates 321 are adjacent to each other and arranged in a circular array about the central axis of the eccentric circular groove 20. The centers of the six groups of equally divided triangular limiting plates 321 form an equilateral hexagonal groove body, and the size of the equilateral hexagonal groove body is adjusted to adapt to nuts of different specifications; specifically, the rivet nut is placed in the reserved circular groove in the center of the fixed limiting circular plate 32, and the swinging swinging convex plate 35 is swung to make the limiting rotating frame ring 33 rotate. At the same time, the connecting inclined rod 332 moves accordingly, and the position of the limiting ring groove 3320 opened on its surface changes, which drives The inner circular protrusion 322 moves, thereby driving the equally divided triangular limit plate 321 to achieve diameter-changing movement, and at this time, the equally divided triangular limit plate 321 here is connected to the limit slider 323 at the bottom to slide horizontally on the side grooves of the hexagonal groove 320, so that the diameter-changing adjustment of multiple groups of equally divided triangular limit plates 321 is achieved, and adaptive adjustment can be made through different sizes of rivet nuts to meet the quick limitation of the rivet nuts, keep the nuts stable, and avoid the nuts from slipping or warping during hardness testing, thereby further improving the accuracy of the rivet nut hardness test.

[0022] Embodiment 3: On the basis of embodiment 2, in order to realize flexible clamping and elastic protection of the side of the rivet nut, this embodiment adds an elastic abutment component, and a buffer groove 3210 is provided on the inner surface of the equally divided triangular limit plate 321, and an elastic abutment component is provided on the inner side of the buffer groove 3210. The elastic component includes an elastic block 3211, and the elastic block 3211 is fixedly installed on the inner surface of the buffer groove 3210. The other end of the elastic block 3211 is fixedly connected to a rivet nut side touch plate 3212, and the rivet nut side touch plate 3212 is movably installed on the inner side of the buffer groove 3210; In this embodiment, if Figure 11-Figure 12 As shown, a buffer groove 3210 is provided on the inner side of the equally divided triangular limiting plate 321, wherein the buffer groove 3210 serves to accommodate the elastic block 3211 and the side touch plate 3212 of the rivet nut, and the two sides of the side touch plate 3212 of the rivet nut are designed to be curved inwardly, so as to avoid obstruction when the adjacent equally divided triangular limiting plates 321 are contracted and adjusted. When the rivet nut is placed in the equilateral hexagonal groove formed by six groups of equally divided triangular limiting plates 321, the side touch plate 3212 of the rivet nut gradually contacts the side of the nut. At this time, the contacting force is balanced, and the elastic effect of the elastic block 3211 is cooperated to enhance the stable limiting of the nut, weaken the impact of the diamond cone test press head 11 on the rivet nut, and avoid damage to the sides of the equally divided triangular limiting plates 321 and the sides of the rivet nut, thereby extending the service life.

[0023] Embodiment 4, on the basis of embodiment 3, in order to realize the locking of the nut after being clamped by multiple groups of equally divided triangular limit plates 321 and prevent the nut from slipping, this embodiment further proposes that the upper guard plate 34 is fixedly installed on the upper end of the eccentric annular frame seat 31, and an arc groove 340 is opened on the inner wall of one side of the upper guard plate 34, and an adaptive inner arc tooth edge 341 is fixedly added to the inner surface of the arc groove 340; a side reserved groove is opened on one side of the upper guard plate 34, and a swinging protrusion 35 is movably installed on the inner side of the side reserved groove, and the upper end of the swinging protrusion 35 A guide rod 351 is fixedly connected, and the cross section of the guide rod 351 is a "T"-shaped structure. A push plate 352 is slidably connected to the outer surface of the guide rod 351. A locking tooth block 3521 is fixedly connected to one end of the push plate 352. The outer surface of the locking tooth block 3521 is movably engaged with the outer surface of the inner arc-shaped tooth edge 341. A return spring 353 is fixedly connected to the lower end of the push plate 352. The other end of the return spring 353 is fixedly connected to the upper surface of the swing convex plate 35. The return spring 353 is slidably sleeved on the lower outer surface of the guide rod 351. In this embodiment, when the swinging convex plate 35 is triggered to realize the variable diameter moving assembly, it is adapted and adjusted according to the size of the nut. Figure 4-Figure 5 As shown, the swinging convex plate 35 swings in the side reserved groove on the side of the upper guard plate 34. When the swinging convex plate 35 is swung, the operator pushes the pushing plate 352 with the index finger, and holds the swinging convex plate 35 with the thumb and the other three fingers to swing, so that the reset spring 353 is stretched, so that the locking tooth block 3521 at one end of the pushing plate 352 is disengaged from the inner teeth of the inner arc-shaped tooth edge 341, and the locking tooth block 3521 releases the restriction on the inner arc-shaped tooth edge 341, so that the swinging convex plate 35 can be swung at will. When adjusted to the desired position, the operator only needs to retract the index finger that pushes the push plate 352 upward, so that the push plate 352 slides downward on the guide rod 351, and at this time the push plate 352 retracts due to the reverse elastic force of the reset spring 353, so that the locking tooth block 3521 is inserted into the inter-tooth position of the inner arc-shaped tooth edge 341 again, so as to achieve self-locking of the swing convex plate 35, and at this time the limiting rotating frame ring 33 is no longer active as a whole, ensuring that the multiple groups of equally divided triangular limiting plates 321 can stably clamp the inner rivet nuts.

[0024] In actual use, step 1, place the self-clinching nut to be tested at a specified position in the test equipment, such as the center position of the eccentric circular groove 20 off the center mentioned in Example 1, to ensure that the nut avoids the central threaded hole, so as to perform an accurate hardness test; step 2, according to the size of the nut to be tested, the variable diameter moving component is triggered by swinging the swinging convex plate 35, so that the equilateral hexagonal groove body formed by the six groups of equally divided triangular limit plates 321 adapts to the size of the nut. When swinging the swinging convex plate 35, the operator pushes the push plate 352 with the index finger, and holds the swinging convex plate 35 with the thumb and the other three fingers to swing, so that the reset spring 353 The locking tooth block 3521 at one end of the push plate 352 is disengaged from the inner teeth of the inner arc-shaped tooth edge 341, and the locking tooth block 3521 releases the restriction on the inner arc-shaped tooth edge 341, so that the swing convex plate 35 can be swung at will; step three, the swing convex plate 35 drives the fixed limiting circular plate 32 to rotate, and the connecting inclined rod 332 moves accordingly, the position of the limiting ring groove 3320 changes, and drives the inner circular convex column 322 to move, thereby driving the equally divided triangular limiting plate 321 to achieve variable diameter movement, and at this time, the equally divided triangular limiting plate 321 here is connected to the limiting slider 323 at the bottom of the hexagonal groove 320 The cam 352 is pressed against the locking cam 351 and the locking cam 352 is pressed against the locking cam 351, thereby the cam 352 is pressed against the locking cam 351 and the locking cam 352 is pressed against the locking cam 352. Stable clamping of the inner rivet nut; Step 5, the operator holds the bevel gear 122 in his hand and rotates it, thereby driving the bevel gear 122 to rotate, so that the bevel gear 123 is adapted to mesh with the bevel gear 122, and at this time the threaded rod 124 rotates, and under the action of the table lifting connecting rod 21 and the threaded adaptation of the threaded rod 124, the hardness test table 2 is lifted, so that the rivet nut is in contact with the lower end of the diamond cone test indenter 11, and then multiple groups of hardness tests are performed, and the average value of the multiple groups of test results is taken as the final test result, and the test results are recorded and saved for subsequent analysis and use.

[0025] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for testing the hardness of a riveted nut, comprising a hardness tester body (1), the hardness tester body (1) comprising a base and a diamond cone test indenter (11), a lifting seat (12) being fixedly mounted on the upper end of the base, a hardness test table (2) being movably connected to the upper end of the lifting seat (12), an operating cavity (120) and a receiving cavity (1200) being respectively formed on the inner walls at both ends of the lifting seat (12), characterized in that: The lower end of the hardness testing table (2) is coaxially connected to a table lifting connecting rod (21), the outer surface of the table lifting connecting rod (21) is slidably connected to the inner wall of the receiving cavity (1200), an eccentric circular groove (20) is provided on the inner wall of the upper end of the hardness testing table (2), and a hardness testing mechanism (3) is arranged on the inner side of the eccentric circular groove (20), the hardness testing mechanism (3) comprises an eccentric annular frame seat (31), a fixed limiting circular plate (32), a limiting rotating frame ring (33) and an upper guard plate (34), and a swinging convex plate (35) is fixedly connected to one side of the limiting rotating frame ring (33).

2. The device for testing the hardness of self-clinching nuts according to claim 1, characterized in that: A side boss (22) is fixedly connected to one side of the hardness test table (2); the side boss (22) is arranged as a parallel plate integrally formed with the hardness test table (2); a clearance groove is arranged at a portion where the side boss (22) is connected to the hardness test table (2); a driving motor (311) is fixedly connected to the lower end of the side boss (22); and a rotating gear (312) is fixedly connected to the output shaft of the driving motor (311).

3. The device for testing the hardness of self-clinching nuts according to claim 1, characterized in that: The eccentric annular frame seat (31) is movably mounted inside the eccentric circular groove (20); an outer ring surface of the eccentric annular frame seat (31) is fixedly connected to a meshing gear ring (313); an outer surface of one side of the meshing gear ring (313) meshes and rotates with an outer surface of a rotating gear (312).

4. The device for testing the hardness of self-clinching nuts according to claim 3, characterized in that: The fixed limiting circular plate (32) is fixedly mounted on the inner bottom surface of the eccentric annular frame seat (31); the fixed limiting circular plate (32) is a hexagonal plate-shaped structure; a reserved circular groove is provided on the central axis of the fixed limiting circular plate (32); the reserved circular groove is used for placing a rivet nut; a hexagonal groove (320) is provided on the outer side of the reserved circular groove; the hexagonal groove (320) is provided on the inner wall of the upper end of the fixed limiting circular plate (32); and a variable diameter moving component is provided on the inner side of the hexagonal groove (320).

5. The device for testing the hardness of self-clinching nuts according to claim 4, characterized in that: The variable diameter moving assembly comprises a limit slider (323) movably mounted on the inner surface of the hexagonal groove (320); the upper end of the limit slider (323) is fixedly connected to an equally divided triangular limit plate (321); and the equally divided triangular limit plate (321) is movably mounted on the upper end of the fixed limit circular plate (32).

6. The device for testing the hardness of self-clinching nuts according to claim 3, characterized in that: The lower end of the position-limiting rotation frame ring (33) is movably connected to the inner bottom surface of the eccentric annular frame seat (31); the upper inner ring of the position-limiting rotation frame ring (33) is provided with an inner ring plate (331); the inner ring plate (331) and the position-limiting rotation frame ring (33) are coaxially distributed; the outer ring surface of the position-limiting rotation frame ring (33) and the inner ring surface of the inner ring plate (331) are fixedly connected with connecting oblique rods (332); six groups of the connecting oblique rods (332) are provided and are arranged in a circular array about the central axis of the inner ring plate (331).

7. The device for testing the hardness of self-clinching nuts according to claim 6, characterized in that: A limiting annular groove (3320) is provided on the inner wall of the connecting oblique rod (332), and a circular convex column (322) is movably connected to the inner surface of the limiting annular groove (3320), and the circular convex column (322) is fixedly mounted on the upper end surface of the equally divided triangular limiting plate (321).

8. The device for testing the hardness of self-clinching nuts according to claim 6, characterized in that: The upper guard plate (34) is fixedly mounted on the upper end of the eccentric annular frame seat (31), an arc-shaped groove (340) is provided on an inner wall of one side of the upper guard plate (34), and an adaptive inner arc-shaped tooth edge (341) is fixedly provided on the inner surface of the arc-shaped groove (340).

9. The device for testing the hardness of self-clinching nuts according to claim 8, characterized in that: A side reserved groove is formed on one side of the upper guard plate (34); the swinging protruding plate (35) is movably mounted on the inner side of the side reserved groove; the upper end of the swinging protruding plate (35) is fixedly connected to a guide rod (351); the cross section of the guide rod (351) is in a "T"-shaped structure; the outer surface of the guide rod (351) is slidably connected to a push plate (352); one end of the push plate (352) is fixedly connected to a locking tooth block (3521); the outer surface of the locking tooth block (3521) is movably engaged with the outer surface of the inner arc-shaped tooth edge (341).

10. The device for testing the hardness of self-clinching nuts according to claim 9, characterized in that: A return spring (353) is fixedly connected to the lower end of the push plate (352), the other end of the return spring (353) is fixedly connected to the upper surface of the swing convex plate (35), and the return spring (353) is slidably sleeved on the lower outer surface of the guide rod (351).

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