Riveting type nut and mounting method

Abstract

The invention discloses a rivet-pulling type nut and an installation method.The nut comprises a nut body and a meshing part, a first step is fixedly connected between the nut body and the meshing part, the first step is connected between the nut body and the meshing part in an abutting mode, and the end, away from the nut body, of the meshing part is fixedly connected with a second step; annular grooves are formed between the periphery of the meshing part and the first step and between the periphery of the meshing part and the second step, inner holes penetrating through the nut are formed in the nut body, the meshing part, the first step and the second step, and internal threads are arranged in the inner holes. The nut is installed in a riveting hole in the inner wall of the pipe in a pull riveting mode. The nut can be installed on the inner wall of the pipe in a rivet pulling mode, and the rivet pulling device is suitable for special installation structures such as the pipe with the hollow structure inside. Moreover, the nut and the pipe are high in connection strength, high in torsion resistance, good in follow-up rotation prevention effect and not prone to shaking, so that the nut is tightly fixed in the riveting hole of the pipe, and the nut can be effectively prevented from falling off from the riveting hole of the pipe.

Description

Technical Field

[0001] The invention relates to a pull-riveting nut and an installation method, belonging to the technical field of fasteners. Background Art

[0002] Nuts are a type of fastener used on thin plates or sheet metals. They are widely used in the assembly of electromechanical and light industrial products such as automobiles, aviation, railways, refrigeration, elevators, switches, instruments, furniture, and decoration. For special installation structures such as hollow pipes, nuts need to be installed on the inner wall of the pipe.

[0003] However, when the nut is installed by riveting, since the inside of the pipe is a hollow structure and the nut is installed deep inside the inner cavity of the pipe, the inner cavity of the pipe cannot provide the support force required for the nut to be riveted. Therefore, installing the nut by riveting is not suitable for this installation structure, and the nut needs to be installed on the inner wall of the pipe by riveting. However, the prior art lacks a nut and an installation method that can be installed on the inner wall of a pipe by riveting. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a rivet nut and an installation method. The present invention can install the nut on the inner wall of the pipe by rivet, and is suitable for special installation structures such as pipes with hollow structures inside.

[0005] On the one hand, the present invention provides a nut of a pull-riveted type, the nut comprising a nut body and an engaging portion, a first step fixedly connected between the nut body and the engaging portion, the first step abutting between the nut body and the engaging portion, a second step fixedly connected to an end of the engaging portion away from the nut body, an annular groove formed between the outer periphery of the engaging portion and the first step and the second step, an inner hole penetrating the nut is provided inside the nut body, the engaging portion, the first step and the second step, the inner hole being provided with an internal thread; wherein the nut is installed in the rivet hole on the inner wall of the pipe by a pull-riveted type.

[0006] In one embodiment of the present invention, the outer diameter of the nut body is larger than the outer diameter of the first step, the outer diameter of the first step is larger than the outer diameter of the second step, and the outer diameter of the second step is larger than the outer diameter of the meshing portion, so that an annular groove is formed between the outer periphery of the meshing portion and the upper end surface of the first step and the lower end surface of the second step.

[0007] In one embodiment of the present invention, the outer circumference of the meshing portion is a tapered structure, the outer diameter of the meshing portion increases from one end facing the nut body to one end facing the second step, and the cross-sectional area of ​​the annular groove decreases from one end of the nut body to one end of the second step; the taper of the outer circumference of the meshing portion is 12°~16°.

[0008] In one embodiment of the present invention, a plurality of radial webs are fixedly connected to the outer periphery of the first step, a plurality of radial grooves are formed between the plurality of radial webs, and the plurality of radial webs abut against a side of the nut body facing the meshing portion.

[0009] In one embodiment of the present invention, a height of the first step along the axial direction of the nut is greater than a height of the radial web along the axial direction of the nut.

[0010] In one embodiment of the present invention, a plurality of axial webs are fixedly connected to the outer periphery of the meshing portion, and a plurality of axial grooves are formed between the plurality of axial webs.

[0011] In one embodiment of the present invention, the nut body, the meshing portion, the first step, and the second step are all annular structures in radial cross-section.

[0012] In one embodiment of the present invention, the nut body, the meshing portion, the first step, and the second step are coaxial hollow cylinders.

[0013] On the other hand, the present invention provides a method for installing a nut using a pull riveting method, using the nut using a pull riveting method, wherein the nut is installed in a riveting hole on the inner wall of a pipe using a pull riveting method, and the method comprises the following steps:

[0014] Step 1: Move the nut to the installation position of the riveting hole on the inner wall of the pipe; provide a mounting rod with a mounting groove, fix the nut in the mounting groove, insert the mounting rod into the inner cavity of the pipe, move the mounting rod, and move the nut fixed in the mounting groove to the riveting hole opened in the pipe;

[0015] Step 2: Install the nut to the rivet gun; pass the gun head of the rivet gun through the upper end of the rivet hole, rotate the gun head of the rivet gun downward to extend into the inner hole of the nut in the inner cavity of the pipe, and threadably match the inner thread of the nut;

[0016] Step 3: Use a rivet gun to rivet the nut; lower the installation rod to make the nut disengage from the installation slot, rotate the gun head of the rivet gun upward, and install the nut in the rivet hole on the inner wall of the pipe by rivet;

[0017] Step 4: Repeat steps 1 to 3 above until all the riveting holes in the pipe where nuts are required to be installed are riveted with nuts.

[0018] In one embodiment of the present invention, the inner wall of the installation groove in step 1 is set to a polygon, and the outer periphery of the nut body is provided with a plurality of planes, and the plurality of planes are embedded with the inner wall of the polygon of the installation groove to fix the nut in the installation groove;

[0019] The riveting in step 3 also includes:

[0020] Step 31: The first step first contacts and squeezes the inner wall of the pipe; the head of the rivet gun rotates and rises to drive the second step and the meshing part to extend into the riveting hole of the pipe, and at the same time drives the first step to rise and squeeze the inner wall of the pipe, so that the periphery of the riveting hole of the pipe is deformed and a deformed object is generated, and the deformed object is squeezed into the annular groove. The deformed object in the annular groove forms a locking ring, and the upper end surface of the first step, the lower end surface of the second step, and the outer periphery of the meshing part jointly lock and fix the locking ring to fasten the nut to the riveting hole of the pipe; wherein, a plurality of axial webs arranged on the outer periphery of the meshing part are embedded in the deformed object, so that part of the deformed object is squeezed into the axial groove;

[0021] Step 32: Several radial webs contact and squeeze the inner wall of the pipe again; the gun head of the rivet gun rotates and rises to drive several radial webs to squeeze into the inner wall of the pipe, causing the inner wall of the pipe to deform and produce deformed objects, which are squeezed into several radial grooves until the end face of the nut body abuts against the inner wall of the pipe.

[0022] The beneficial effects of the present invention are:

[0023] The present invention provides a rivet nut and installation method, which can install the nut on the inner wall of a pipe by rivet, and is suitable for special installation structures such as pipes with hollow internal structures. In addition, the nut has a reinforcing and locking function through an annular groove, a radial web, and an axial web, thereby improving the torsion resistance and the anti-rotation effect, achieving a better locking effect, avoiding axial displacement of the nut, improving the connection strength between the nut and the pipe, and preventing shaking, so that the nut is tightly fixed in the riveting hole of the pipe, and can effectively prevent the nut from falling off from the riveting hole of the pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a three-dimensional diagram of the nut provided by the present invention when it is installed.

[0025] Figure 2 A stereoscopic view of a nut provided by the present invention from one viewing angle.

[0026] Figure 3 A stereoscopic view of the nut provided by the present invention from another perspective.

[0027] Figure 4A top view of the nut provided by the present invention.

[0028] Figure 5 A bottom view of the nut provided by the present invention.

[0029] Figure 6 A front view of a nut provided by the present invention.

[0030] Figure 7 for Figure 6 AA section view.

[0031] Figure 8 This is a schematic diagram of the installation of the nut provided by the present invention.

[0032] Fig. 9 for Figure 8 Schematic diagram of part of the structure.

[0033] Fig.10 A three-dimensional view of the mounting rod provided by the present invention.

[0034] Fig.11 This is a schematic diagram of the nut provided by the present invention being installed on the inner wall of a pipe.

[0035] Fig.12 for Fig.11 Schematic diagram of part of the structure.

[0036] In the figure: 1. nut body; 2. meshing part; 3. radial web; 4. first step; 5. second step; 6. annular groove; 7. inner hole; 8. inner thread; 9. plane; 10. nut; 20. mounting rod; 21. mounting groove; 30. pipe; 31. rivet hole; 40. rivet gun. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on 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.

[0038] In the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0040] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Fig.12 The present invention provides a nut by draw riveting. In some embodiments, the nut 10 includes a nut body 1 and a meshing portion 2, a first step 4 is fixedly connected between the nut body 1 and the meshing portion 2, a second step 5 is fixedly connected to the end of the meshing portion 2 away from the nut body 1, an annular groove 6 is formed between the outer periphery of the meshing portion 2 and the first step 4 and the second step 5, an inner hole 7 penetrating the nut 10 is provided inside the nut body 1, the meshing portion 2, the first step 4, and the second step 5, and the inner hole 7 is provided with an internal thread 8; wherein the nut 10 is installed in the rivet hole 31 on the inner wall of the pipe 30 by draw riveting.

[0041] In some embodiments, the first step 4 abuts between the nut body 1 and the meshing portion 2. The nut body 1, the first step 4, the meshing portion 2, and the second step 5 may be an integrated structure, and the integrated structure makes the entire nut 10 stronger, meeting the high-strength connection requirement between the nut 10 and the pipe 30.

[0042] In some embodiments, the nut body 1, the meshing portion 2, the first step 4, and the second step 5 are all annular structures in radial cross-section. The second step 5 is set to an annular structure to be consistent with the shape of the gun head of the rivet gun 40, so that the rivet gun 40 can apply a rivet force to it.

[0043] In some embodiments, the nut body 1 , the meshing portion 2 , the first step 4 , and the second step 5 are coaxial hollow cylinders.

[0044] In some embodiments, a plurality of radial webs 3 are fixedly connected to the outer periphery of the first step 4 , a plurality of radial grooves are formed between the plurality of radial webs 3 , and the plurality of radial webs 3 abut against a side of the nut body 1 facing the meshing portion 2 .

[0045] Furthermore, a height of the first step 4 along the axial direction of the nut 10 is greater than a height of the radial web 3 along the axial direction of the nut 10 .

[0046] The radial groove is not shown in the figure. The radial web 3 may be a thin plate with a certain thickness, which is an integral structure with the nut body 1 and the first step 4. The radial groove may be a groove with a certain depth. Several radial webs 3 may be evenly distributed on the outer periphery of the meshing portion 2. Figure 7 , Fig.11 as well as Fig.12 As shown, during the process of installing the nut 10 in the riveting hole 31 of the pipe 30, the second step 5 and the meshing portion 2 extend into the riveting hole 31 of the pipe 30. Since the height of the first step 4 is greater than the height of the radial web 3, the first step 4 of the nut 10 first contacts and squeezes the inner wall of the pipe 30, and then the plurality of radial webs 3 contact and squeeze the inner wall of the pipe 30, so that the plurality of radial webs 3 squeeze into the inner wall of the pipe 30, thereby deforming the inner wall of the pipe 30 and generating deformed objects, which are squeezed into the plurality of radial grooves, thereby generating a locking effect, making it difficult for the nut 10 and the inner wall of the pipe 30 to rotate relative to each other, thereby improving the anti-torsion capability; at the same time, the end face of the nut body 1 abuts against the inner wall of the pipe 30, thereby improving the connection strength between the nut 10 and the pipe 30.

[0047] In some embodiments, the outer diameter of the nut body 1 is larger than the outer diameter of the first step 4, the outer diameter of the first step 4 is larger than the outer diameter of the second step 5, and the outer diameter of the second step 5 is larger than the outer diameter of the meshing portion 2, so that an annular groove 6 is formed between the outer periphery of the meshing portion 2 and the upper end surface of the first step 4 and the lower end surface of the second step 5.

[0048] In this embodiment, the outer diameters of the nut body 1, the first step 4, the second step 5, and the meshing portion 2 decrease in sequence, so that an annular groove 6 is formed between the outer periphery of the meshing portion 2 and the upper end surface of the first step 4 and the lower end surface of the second step 5. Fig.12As shown, during the process of installing the nut 10 in the riveting hole 31 of the pipe 30, the first step 4 of the nut 10 is in full contact with the inner wall of the pipe 30, and the first step 4 is squeezed by the external force against the inner wall of the pipe 30, so that the periphery of the riveting hole 31 of the pipe 30 is deformed and a deformed object is generated, and the deformed object is squeezed into the annular groove 6. The deformed object in the annular groove 6 forms a locking ring, and the upper end surface of the first step 4, the lower end surface of the second step 5, and the outer periphery of the meshing portion 2 jointly lock and fix the locking ring, so that the nut 10 is tightly fixed in the riveting hole 31 of the pipe 30, thereby achieving a good locking effect, avoiding axial displacement of the nut 10, improving the connection strength between the nut 10 and the pipe 30, not prone to shaking, and effectively preventing the nut 10 from falling off from the riveting hole 31 of the pipe 30.

[0049] In some embodiments, the outer periphery of the meshing portion 2 is a tapered structure, and the outer diameter of the meshing portion 2 increases from one end facing the nut body 1 to one end facing the second step 5. Through this design, the outer diameter of the meshing portion 2 changes in a tapered manner, so that the cross-sectional area of ​​the annular groove 6 decreases from one end of the nut body 1 to one end of the second step 5, which is more conducive to the deformation object forming a locking ring in the annular groove 6, and facilitates the tightening of the nut 10.

[0050] Optionally, the taper of the outer periphery of the meshing portion 2 is 12° to 16°.

[0051] In this embodiment, since the taper of the outer periphery of the meshing portion 2 is 12° to 16°, this taper range is more conducive to the deformation object forming a locking ring in the annular groove 6, which can further enhance the tightening effect on the nut 10.

[0052] In some embodiments, a plurality of axial webs are fixedly connected to the outer periphery of the meshing portion 2, and a plurality of axial grooves are formed between the plurality of axial webs.

[0053] The axial web and the axial groove are not shown in the figure. The axial web may be a thin plate with a certain thickness, and the axial groove may be a groove with a certain depth. Figure 6 , Figure 7 or Fig.12 For example, a plurality of axial webs can be evenly distributed on the periphery of the meshing part 2 along the axial direction of the nut 10. When the periphery of the meshing part 2 is used to lock the deformed object in the riveting hole 31, a plurality of axial webs on the periphery of the meshing part 2 can be embedded in the deformed object, so that part of the deformed object is squeezed into the axial groove, which can further improve the locking effect, making it difficult for the nut 10 and the riveting hole 31 to rotate relative to each other, and having good locking effect, good anti-rotation effect, and strong anti-torsion ability.

[0054] Therefore, the present application uses the annular groove 6, the radial web 3, and the axial web to simultaneously play a role in reinforcing and locking, thereby improving the torsional resistance, improving the anti-rotation effect, and providing a better locking effect, which can effectively prevent the nut 10 from falling off from the riveting hole 31 of the pipe 30.

[0055] In some embodiments, a plurality of planes 9 are provided on the outer circumference of the nut body 1 .

[0056] During the installation process of the nut 10 provided in the present application, the nut 10 is fixed by using the mounting rod 20. Several of the planes 9 are in contact with the inner wall of the mounting groove 21 provided on the mounting rod 20. Specifically, the several planes 9 make the outer periphery of the nut body 1 a polygon, and the inner wall of the mounting groove 21 of the mounting rod 20 is also set to the same polygon. By fitting the two polygons, the nut 10 can be effectively prevented from rotating with the gun head of the rivet gun 40 during riveting, so that the mounting groove 21 can achieve the fixing effect on the nut 10, preventing the nut 10 from rotating, thereby ensuring the effective riveting operation.

[0057] Please refer to Figure 1 , Figure 8 , Fig. 9 , Fig.10 , Fig.11 and Fig.12 When in use, place the nut 10 in the mounting groove 21 of the mounting rod 20, and the polygonal outer wall of the nut 10 is embedded in the polygonal inner wall of the mounting groove 21. Insert the mounting rod 20 into the inner cavity of the pipe 30, move the mounting rod 20, and move the nut 10 fixed in the mounting rod 20 to the rivet hole 31 opened in the pipe 30. Pass the gun head of the rivet gun 40 through the upper end of the rivet hole 31, rotate the gun head of the rivet gun 40 down and extend it into the inner hole 7 of the nut 10 in the inner cavity of the pipe 30, and threadedly cooperate with the internal thread 8 of the nut 10. Put down the mounting rod 20, rotate the gun head of the rivet gun 40 up, and install the nut 10 in the rivet hole 31 on the inner wall of the pipe 30 by rivet. Repeat the above operation until all the rivet holes 31 in the pipe 30 are installed with nuts 10 by rivet.

[0058] In addition, the present invention also provides a method for installing a nut using a pull riveting method, using the nut using the pull riveting method, wherein the nut 10 is installed in a riveting hole 31 on the inner wall of a pipe 30 using a pull riveting method, and the method comprises the following steps:

[0059] Step 1: Move the nut 10 to the installation position of the riveting hole 31 on the inner wall of the pipe 30; provide a mounting rod 20 with a mounting groove 21, fix the nut 10 in the mounting groove 21, insert the mounting rod 20 into the inner cavity of the pipe 30, move the mounting rod 20, and move the nut 10 fixed in the mounting groove 21 to the riveting hole 31 opened in the pipe 30;

[0060] Step 2: Install the nut 10 to the rivet gun 40; pass the gun head of the rivet gun 40 through the upper end of the rivet hole 31, rotate the gun head of the rivet gun 40 downward to extend into the inner hole 7 of the nut 10 in the inner cavity of the pipe 30, and threadably engage with the internal thread 8 of the nut 10;

[0061] Step 3: Use the rivet gun 40 to rivet the nut 10; lower the mounting rod 20 to disengage the nut 10 from the mounting groove 21, rotate the rivet gun 40 upward, and install the nut 10 in the rivet hole 31 on the inner wall of the pipe 30 by rivet.

[0062] Step 4: Repeat the above steps 1 to 3 until all the riveting holes 31 in the pipe 30 where the nuts 10 are required to be installed are installed with nuts 10 by means of pull rivets.

[0063] Furthermore, the inner wall of the installation groove 21 in the step one is set to a polygon, and the outer periphery of the nut body 1 is provided with a plurality of planes 9, and the plurality of planes 9 are embedded with the polygonal inner wall of the installation groove 21 to fix the nut 10 in the installation groove 21.

[0064] Optionally, the cross section of the mounting rod 20 is smaller than the cross section of the inner wall of the pipe 30. Through this design, the mounting rod 20 can extend into the inner cavity of the pipe 30, and then the nut 10 can be transferred to the riveting hole 31 of the pipe 30.

[0065] Furthermore, the riveting in step three further comprises:

[0066] Step 31, the first step 4 first contacts and squeezes the inner wall of the pipe 30; the head of the rivet gun 40 rotates and rises to drive the second step 5 and the meshing part 2 to extend into the riveting hole 31 of the pipe 30, and at the same time drives the first step 4 to rise and squeeze the inner wall of the pipe 30, so that the periphery of the riveting hole 31 of the pipe 30 is deformed and a deformed object is generated, and the deformed object is squeezed into the annular groove 6. The deformed object in the annular groove 6 forms a locking ring, and the upper end surface of the first step 4, the lower end surface of the second step 5, and the outer periphery of the meshing part 2 jointly lock and fix the locking ring to fasten the nut 10 to the riveting hole 31 of the pipe 30; wherein, a plurality of axial webs arranged on the outer periphery of the meshing part 2 are embedded in the deformed object, so that part of the deformed object is squeezed into the axial groove;

[0067] Step 32, several radial webs 3 contact and squeeze the inner wall of the tube 30 again; the gun head of the rivet gun 40 rotates and rises to drive several radial webs 3 to squeeze into the inner wall of the tube 30, causing the inner wall of the tube 30 to deform and produce deformed objects, which are squeezed into several radial grooves until the end face of the nut body 1 abuts against the inner wall of the tube 30.

[0068] In summary, the present invention provides a rivet nut and installation method, which can install the nut on the inner wall of the pipe by rivet, and is suitable for special installation structures such as pipes with hollow internal structures. In addition, the nut has a reinforcing and locking function through an annular groove, a radial web, and an axial web, which improves the torsion resistance and the anti-rotation effect, achieves a better locking effect, avoids axial displacement of the nut, improves the connection strength between the nut and the pipe, is not prone to shaking, and makes the nut tightly fixed in the riveting hole of the pipe, which can effectively prevent the nut from falling off from the riveting hole of the pipe.

[0069] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0070] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention.

[0071] The principles and implementation methods of the present invention are described in this article using specific embodiments. The description of the above embodiments is only used to help understand the method and core ideas of the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention. Therefore, the scope of protection of the patent of the present invention shall be based on the attached claims.

Claims

1. A pull riveting nut, characterized in that: The nut (10) comprises a nut body (1) and a meshing portion (2); a first step (4) is fixedly connected between the nut body (1) and the meshing portion (2); the first step (4) abuts between the nut body (1) and the meshing portion (2); a second step (5) is fixedly connected to one end of the meshing portion (2) away from the nut body (1); an annular groove (6) is formed between the outer periphery of the meshing portion (2) and the first step (4) and the second step (5); an inner hole (7) penetrating the nut (10) is provided inside the nut body (1), the meshing portion (2), the first step (4) and the second step (5); the inner hole (7) is provided with an internal thread (8); wherein the nut (10) is installed in a rivet hole (31) on the inner wall of a pipe (30) by riveting.

2. The pull riveting nut according to claim 1, characterized in that: The outer diameter of the nut body (1) is greater than the outer diameter of the first step (4), the outer diameter of the first step (4) is greater than the outer diameter of the second step (5), and the outer diameter of the second step (5) is greater than the outer diameter of the meshing portion (2), so that an annular groove (6) is formed between the outer periphery of the meshing portion (2) and the upper end surface of the first step (4) and the lower end surface of the second step (5).

3. The pull-riveting nut according to claim 2, characterized in that: The outer periphery of the meshing portion (2) is a tapered structure, the outer diameter of the meshing portion (2) increases gradually from one end facing the nut body (1) to one end facing the second step (5), and the cross-sectional area of ​​the annular groove (6) decreases gradually from one end of the nut body (1) to one end of the second step (5); the taper of the outer periphery of the meshing portion (2) is 12° to 16°.

4. The pull riveting nut according to claim 1, characterized in that: A plurality of radial webs (3) are fixedly connected to the outer periphery of the first step (4), a plurality of radial grooves are formed between the plurality of radial webs (3), and the plurality of radial webs (3) abut against a side of the nut body (1) facing the meshing portion (2).

5. The pull riveting nut according to claim 4, characterized in that: The height of the first step (4) along the axial direction of the nut (10) is greater than the height of the radial web (3) along the axial direction of the nut (10).

6. The pull-riveting nut according to claim 1, characterized in that: A plurality of axial webs are fixedly connected to the outer periphery of the meshing portion (2), and a plurality of axial grooves are formed between the plurality of axial webs.

7. The pull-riveting nut according to claim 1, characterized in that: The nut body (1), the meshing portion (2), the first step (4), and the second step (5) are all annular structures in radial cross-section.

8. The pull-riveting nut according to claim 1, characterized in that: The nut body (1), the meshing portion (2), the first step (4), and the second step (5) are coaxial hollow cylinders.

9. A method for installing a rivet nut, characterized in that: The pull-riveted nut according to any one of claims 1 to 8 is used, and the nut (10) is installed in a riveting hole (31) on the inner wall of a pipe (30) by pull-riveting, comprising the following steps: Step 1: Move the nut (10) to the installation position of the riveting hole (31) on the inner wall of the pipe (30); provide a mounting rod (20) provided with a mounting groove (21), fix the nut (10) in the mounting groove (21), insert the mounting rod (20) into the inner cavity of the pipe (30), move the mounting rod (20), and move the nut (10) fixed in the mounting groove (21) to the riveting hole (31) opened in the pipe (30); Step 2: Install the nut (10) to the rivet gun (40); pass the gun head of the rivet gun (40) through the upper end of the rivet hole (31), rotate the gun head of the rivet gun (40) downward to extend into the inner hole (7) of the nut (10) in the inner cavity of the pipe (30), and threadably engage with the internal thread (8) of the nut (10); Step 3: Use a rivet gun (40) to rivet the nut (10); lower the mounting rod (20) to disengage the nut (10) from the mounting groove (21), rotate the gun head of the rivet gun (40) upward, and install the nut (10) in the rivet hole (31) on the inner wall of the pipe (30) by rivet method; Step 4: Repeat the above steps 1 to 3 until all the riveting holes (31) in the pipe (30) where the nuts (10) are to be installed are installed with nuts (10) by means of pull rivets.

10. The method for installing a rivet nut according to claim 9, characterized in that: The inner wall of the installation groove (21) in the step 1 is arranged in a polygonal shape, and the outer periphery of the nut body (1) is arranged with a plurality of planes (9), and the plurality of planes (9) are engaged with the polygonal inner wall of the installation groove (21) to fix the nut (10) in the installation groove (21); The riveting in step three also includes: Step 31, the first step (4) first contacts and squeezes the inner wall of the pipe (30); the gun head of the rivet gun (40) rotates and rises to drive the second step (5) and the meshing part (2) to extend into the riveting hole (31) of the pipe (30), and at the same time drives the first step (4) to rise and squeeze the inner wall of the pipe (30), so that the periphery of the riveting hole (31) of the pipe (30) is deformed and a deformed object is generated, and the deformed object is squeezed into the annular groove (6). The deformed object in the annular groove (6) forms a locking ring, and the upper end surface of the first step (4), the lower end surface of the second step (5), and the outer periphery of the meshing part (2) jointly lock and fix the locking ring to fasten the nut (10) to the riveting hole (31) of the pipe (30); wherein, a plurality of axial webs arranged on the outer periphery of the meshing part (2) are embedded in the deformed object, so that part of the deformed object is squeezed into the axial groove; Step 32: A plurality of radial webs (3) contact and squeeze the inner wall of the tube (30); the head of the rivet gun (40) rotates and rises to drive the plurality of radial webs (3) to squeeze into the inner wall of the tube (30), causing the inner wall of the tube (30) to deform and produce deformed objects, which are squeezed into a plurality of radial grooves until the end face of the nut body (1) abuts against the inner wall of the tube (30).

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