Self-sealing type self-plugging rivet for supporting plate nut

Abstract

The invention provides a self-sealing type self-plugging rivet for a supporting plate nut. The self-sealing type self-plugging rivet is composed of a core rod, a rivet sleeve and a sealing rubber plug. The core rod is of a long and thin rod structure, the tail end of the core rod is arranged in the riveter head, an extrusion ball head and a shearing ring are arranged at the end, away from the riveter head, of the core rod, the extrusion ball head is of a spherical structure internally provided with a blind hole, and the shearing ring is subjected to shearing wire drawing deformation during riveting so that the sealing rubber plug can be tightly pressed on the extrusion ball head. The rivet sleeve is of a hollow thin-wall structure, and the rivet sleeve is arranged on the core rod in a sleeving mode and clamped through a clamping ring groove formed in the core rod; the sealing rubber plug is of a full-rubber structure and comprises a rod part, a connecting part and a wrapping part which are connected with one another, the rod part and the connecting part extend into the nail sleeve and are matched with the nail sleeve for sealing, and the wrapping part is matched with the extrusion ball head for wrapping and locking so as to clamp the sealing rubber plug. According to the self-sealing self-plugging rivet, the self-sealing effect is synchronously achieved when riveting is completed, and the air tightness of a product after riveting is high.

Description

Technical Field

[0001] This application belongs to the field of fastener technology, and in particular relates to a self-sealing pop rivet for a pallet nut. Background Technology

[0002] Plate nuts are an important type of fastener in high-end equipment structures such as aerospace. Their design features the integration of the nut with a plate (or base plate). The plate enhances connection stability through its fixing effect, increases the stress-bearing area through the plate structure, reduces local stress concentration, and improves connection fatigue life. They are especially suitable for thin-walled, easily deformable, or difficult-to-tap structures.

[0003] Currently, in the existing connection pair form, the plate nut needs to be installed on one side of the connection structure in advance. The connection between the plate nut and the base is generally made by riveting with solid rivets or by using blind rivets. Solid rivets require operation on both sides to install, so the installation procedure is more complicated and cannot be installed in closed parts. In closed parts, the plate nut can only be installed using special blind rivets.

[0004] Currently, the blind rivets used for single-sided connections of pallet nuts are hollow after riveting. In some applications requiring airtightness, additional sealing treatment is needed for the riveted blind rivets. For example, sealant is added to the hollow hole after riveting, or a rubber rod is inserted to seal it and meet the sealing requirements. However, since the general design of pallet nut blind rivets does not consider sealing requirements, the requirements for the sealing rubber rod and the skill level of the workers are relatively high, which can easily lead to poor airtightness stability after secondary sealing. These operations bring a lot of additional workload to aircraft assembly, making the assembly work intensity high and further limiting the convenient use of pallet nuts on aircraft. Summary of the Invention

[0005] In view of this, this application aims to provide a self-sealing type pop rivet for a plate nut to solve at least one of the above problems.

[0006] To achieve the above objectives, the technical solution of this application is implemented as follows: This application provides a self-sealing pop rivet for a pallet nut, the pop rivet consisting of a core rod, a rivet sleeve, and a sealing rubber plug; The core rod is a slender rod structure. The end of the core rod is installed inside the rivet gun head. The end of the core rod away from the rivet gun head is provided with a compression ball head and a shearing ring. The compression ball head is a spherical structure with a built-in blind hole. The shearing ring undergoes shearing and wire-drawing deformation during riveting to press the sealing rubber plug tightly onto the compression ball head. The nail sleeve is a hollow thin-walled structure. The nail sleeve is sleeved on the core rod and is secured by a retaining ring groove provided on the core rod. The sealing rubber plug is an all-rubber structure. The sealing rubber plug includes a rod, a connecting part, and a wrapping part that are connected to each other. The rod and the connecting part extend into the nail sleeve and cooperate with the nail sleeve to seal. The wrapping part cooperates with the extrusion ball head to wrap and lock, so as to clamp the sealing rubber plug.

[0007] Furthermore, the shearing ring has a boss-shaped disc structure, the diameter of the shearing ring on the side near the retaining ring groove is larger than the diameter on the side near the extrusion ball head, and the shearing ring on the side near the extrusion ball head is provided with a shearing guide groove.

[0008] Furthermore, the retaining ring groove has a raised straight ring pattern, and the outer diameter of the maximum tooth tip of the retaining ring groove is larger than the inner diameter of the nail sleeve.

[0009] Furthermore, the nail sleeve includes a smooth rod and a countersunk head; The optical rod has a thin-walled structure with a hole in the center. The countersunk head mates with the mounting hole. The countersunk head has a countersunk conical hole inside, which works together with the connecting part of the sealing rubber plug to lock the sealing rubber plug. Furthermore, the root of the shear ring near the retaining ring groove is rounded to match the rounded corner on the orifice of the optical rod.

[0010] Furthermore, the rod portion of the sealing rubber plug includes a large end and a smooth end. The diameter of the large end is the same as the smooth rod diameter of the nail sleeve and is smaller than the outer diameter of the nail sleeve. The outer diameter of the smooth end is larger than the inner diameter of the nail sleeve.

[0011] Furthermore, the connecting part has a conical structure, and the connection between the connecting part and the end of the guide rod is a variable diameter structure. The connecting part is used to mate with the countersunk conical hole of the nail sleeve.

[0012] Furthermore, the wrapping portion includes an outer wrapping end and an inner wrapping end; The outer wrapping end is a thin-walled rubber sleeve structure, and a recessed breakage groove is provided at the root. The inner wrapping end is a solid rotating rubber body, which is located inside the blind hole of the extrusion ball head, and a breakage groove is also provided at the root of the inner wrapping end.

[0013] Compared with the prior art, the self-sealing type blind rivet for pallet nuts described in this application has the following advantages: The self-sealing blind rivet for pallet nuts described in this application achieves a self-sealing effect simultaneously upon completion of riveting through a matching core rod, rivet sleeve, and sealing rubber plug structure. This product exhibits high airtightness after riveting. At the same time, it effectively reduces the skill requirements for workers and the intensity of aircraft assembly work, and further enhances the ease of use of pallet nuts on aircraft. Attached Figure Description

[0014] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of a self-sealing type pop rivet structure for a pallet nut according to an embodiment of this application; Figure 2 This is a schematic diagram of the core rod structure described in the embodiments of this application; Figure 3 This is a schematic diagram of the nail sleeve structure described in the embodiments of this application; Figure 4 This is a schematic diagram of the rubber sealing plug structure described in the embodiments of this application; Figure 5 This is a schematic diagram of the product being inserted into the mounting hole according to an embodiment of this application; Figure 6 This is a schematic diagram showing the shear ring on the core rod being cut off during the riveting process described in the embodiments of this application; Figure 7 This is a schematic diagram illustrating the collapse of the extrusion ball head extrusion pin sleeve hole wall and the locking of the rubber sealing plug as described in the embodiments of this application; Figure 8 This is a schematic diagram of the riveted core rivet as described in the embodiments of this application.

[0015] Explanation of reference numerals in the attached figures: 1. Core rod; 1-1. Extruded ball head; 1-2. Shearing ring; 1-3. Snap ring groove; 1-4. Pull ring groove; 2-1. Polished rod; 2-2. Countersunk head; 2-3. Countersunk tapered hole; 3. Rubber sealing plug; 3-1. Large end; 3-2. Smooth end; 3-3. Conical end; 3-4. Outer wrapping end; 3-5. Inner wrapping end. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0017] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in the embodiments of this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0018] Please see Figure 1 As shown, this embodiment provides a self-sealing blind rivet for a support plate nut. The blind rivet consists of a core rod 1, a rivet sleeve, and a sealing rubber plug. The core rod 1 is a slender rod structure. The end of the core rod 1 is installed inside the rivet gun head. The end of the core rod 1 away from the rivet gun head is provided with a compression ball head 1-1 and a shearing ring 1-2. The compression ball head 1-1 is a spherical structure with a built-in blind hole. The shearing ring 1-2 undergoes shearing and wire-pulling deformation during riveting to press the sealing rubber plug tightly onto the compression ball head 1-1. The nail sleeve is a hollow thin-walled structure. The nail sleeve is fitted onto the core rod 1 and is secured by the retaining ring grooves 1-3 provided on the core rod 1. The sealing rubber plug is an all-rubber structure. The sealing rubber plug includes a connected rod, a connecting part, and a wrapping part. The rod and the connecting part extend into the nail sleeve and cooperate with the nail sleeve to seal. The wrapping part cooperates with the extrusion ball head 1-1 to wrap and lock, so as to clamp the sealing rubber plug.

[0019] The self-sealing blind rivet for pallet nuts described in this embodiment achieves a self-sealing effect simultaneously upon completion of riveting through a matching core rod 1, rivet sleeve, and sealing rubber plug structure. This product exhibits high airtightness after riveting. At the same time, it effectively reduces the skill requirements for workers and the intensity of aircraft assembly work, and further enhances the ease of use of pallet nuts on aircraft.

[0020] Specifically, in this embodiment, the core rod 1 has the following structure: Figure 2 As shown, it is a slender rod structure made of metal, and has four structural parts: extrusion ball head 1-1, shearing ring 1-2, retaining ring groove 1-3, and pull ring groove 1-4.

[0021] Among them, the extrusion ball head 1-1 is a spherical structure with a central blind hole. It has two main functions. One is to extrude the rivet sleeve during riveting, causing the rivet sleeve to bulge and deform, thus connecting the support plate nut and the base body tightly. The second function is to transform the central blind hole of the extrusion ball head 1-1 into a conical structure through the extrusion deformation of the rivet sleeve, thereby clamping the sealing rubber plug placed in the central blind hole. This allows the sealing rubber plug to be pulled into the central hole of the rivet sleeve during the riveting process.

[0022] The shear ring 1-2 has a boss-shaped disc structure with a rounded corner at its left root to cooperate with the rounded corner of the nail sleeve opening. A shear guide groove is provided on the right side of the shear ring 1-2. The diameter of the smooth rod 2-1 on the left side of the shear ring 1-2 is slightly larger than the diameter on the right side of the shear ring 1-2, which is beneficial to the shear deformation of the shear ring 1-2 during riveting. During riveting, the shear ring 1-2 undergoes shearing and wire-drawing deformation in the opposite direction of the movement of the core rod 1 under the action of the shear guide groove. The shear ring 1-2 will enter the interior of the nail sleeve opening as a whole, causing the nail sleeve to begin to widen and deform. As the deformation further evolves, the shear ring 1-2 will move towards the extrusion ball head 1-1, thereby pressing the outer end 3-4 of the rubber sealing plug 3 onto the extrusion ball head 1-1 of the core rod 1.

[0023] The retaining ring groove 1-3 is a raised straight ring structure. Its maximum tooth tip outer diameter is larger than the inner hole diameter of the nail sleeve. Its main function is to clamp the nail sleeve and prevent it from falling off the core rod 1. The retaining ring groove 1-3 is formed after the core rod 1 and the nail sleeve are assembled.

[0024] The pull ring grooves 1-4 have a straight ring pattern. The purpose of the straight pattern is to increase the friction between the core rod 1 and the rivet gun chuck. When the rivet gun is working, the rivet gun chuck clamps the straight ring part of the core rod 1 under the action of high pressure gas and pulls the core rod 1 backward. The straight pattern prevents the rivet gun chuck from slipping when clamping the core rod 1.

[0025] Nail sleeve Figure 3 As shown, it is a hollow thin-walled part made of metal, and it has three structural parts: a smooth rod 2-1, a countersunk head 2-2, and a countersunk head 2-2 tapered hole.

[0026] Among them, the smooth rod 2-1 is a hollow thin-walled structure, which plays an expansion and deformation role during the riveting process, and is used to press the plate nut onto the base; the countersunk head 2-2 is mainly used to cooperate with the mounting hole, and plays a supporting and tensile role; the main function of the conical hole of the countersunk head 2-2 is to work together with the limiting cone of the sealing rubber plug to lock the sealing rubber plug.

[0027] Sealing rubber plugs, such as Figure 4 As shown, the whole structure is made of rubber, and it is composed of a large end 3-1, a smooth rod end 3-2, a conical end 3-3, an outer wrapping end 3-4, and an inner wrapping end 3-5.

[0028] The diameter of the large end 3-1 is the same as the diameter of the smooth rod 2-1 of the rivet sleeve, and slightly smaller than the outer diameter of the rivet sleeve, so that it can be smoothly inserted into the mounting hole during riveting. The outer diameter of the smooth rod end 3-2 is basically the same as the inner diameter of the rivet sleeve (slightly larger than the inner diameter of the rivet sleeve). During riveting, the smooth rod end 3-2 will temporarily become thinner under the action of tension. After the installation is completed, it will return to its original diameter. Since its original diameter is slightly larger than the inner diameter of the rivet sleeve, it can completely expand and seal with the inner diameter of the rivet sleeve.

[0029] The conical end 3-3 has a conical shape. After riveting, it works in conjunction with the conical hole of the nail sleeve. After the pull pin is installed, the conical end 3-3 will completely fill and expand in the conical hole of the nail sleeve to achieve a sealing effect.

[0030] The outer end 3-4 is a thin-walled rubber sleeve structure with a recessed pull-out groove at the root, which allows it to break at the root when subjected to a tensile force exceeding its maximum capacity. Its main function is to wrap around the outer surface of the extrusion ball head 1-1 on the core rod 1. One function is to fix the sealing rubber plug on the pull rivet and prevent it from loosening and falling off during transportation and storage. The second function is that during the riveting process, through the shearing action of the shearing ring 1-2 on the core rod 1 and the extrusion ball head 1-1, the outer end 3-4 is clamped together, and together they pull the sealing rubber plug into the blind end opening upset head formed by the rivet sleeve to provide some tensile force.

[0031] The inner wrapping end 3-5 is a solid rotating rubber body with a breakage groove at its root. The diameter of the breakage groove is smaller than the diameter of the inner wrapping end 3-5, which allows it to break at the root when subjected to a tensile force exceeding its maximum withstand value. The inner end 3-5 is positioned within the blind hole in the extrusion ball head 1-1 of the core rod 1. The two work together in an interference fit, serving two main functions. Firstly, before use during product storage, it secures the rubber sealing plug 3 to the core rod 1, preventing it from falling off during transportation or storage, and ensuring that the sealing plug won't fall off when the component is firmly and securely inserted into the mounting hole during use. Secondly, during riveting, the extrusion ball head 1-1 deforms under the pressure of the inner wall of the nail sleeve and the shear ring 1-2, transforming its cylindrical shape into a conical locking space. This completely encloses and locks the inner end 3-5 of the rubber sealing plug 3. When the rubber sealing plug 3 is pulled in this state, the pulling force increases to a certain limit, causing the rubber sealing plug 3 to break at the root of the pull-off groove in the inner end 3-5 and the root of the pull-off groove in the outer end 3-4, thus ensuring the successful completion of the entire installation and sealing process.

[0032] Example 1: When using a rivet gun to rivet a blind rivet to a component to be riveted, the riveting process is as follows: like Figure 5 As shown, first, the front half of the assembled blind rivet is coated with sealant, and then inserted into the rivet hole of the part to be riveted, so that the rivet head on the rivet sleeve is pressed against the opening of the rivet hole of the part to be riveted; then, the end of the core rod 1 is inserted into the head of the rivet gun, and the rivet gun head end face is used to press the rivet sleeve of the blind rivet against the part to be riveted, and then the rivet gun trigger is pressed, and the rivet gun starts to work.

[0033] The rivet gun clamps the core rod 1 of the pop rivet through the internal chuck of the gun head. Under the action of air pressure, the chuck clamps the core rod 1 and retracts. During the retraction of the core rod 1, the shearing ring 1-2 at the head of the core rod 1 presses against the end face of the rivet sleeve hole. The shearing ring 1-2 has a boss-shaped disc structure with a rounded corner on its left root, which works in conjunction with the rounded corner of the rivet sleeve hole. A shearing guide groove is provided on the right side of the shearing ring 1-2. The diameter of the smooth rod 2-1 on the left side of the shearing ring 1-2 is slightly larger than the diameter on the right side of the shearing ring 1-2, which is beneficial to the shearing deformation of the shearing ring 1-2 during riveting.

[0034] like Figure 6 As shown, during riveting, under the action of the shear guide groove, the shear ring 1-2 undergoes shearing and wire-pulling deformation in the opposite direction of the movement of the core rod 1. The shear ring 1-2 will enter the inside of the nail sleeve hole as a whole, causing the nail sleeve to start to expand and deform. As the deformation further evolves, the shear ring 1-2 will move towards the extrusion ball head 1-1 through wire-pulling deformation, thereby pressing the outer end 3-4 of the rubber sealing plug 3 onto the extrusion ball head 1-1 of the core rod 1.

[0035] The extrusion ball head 1-1 is a spherical structure with a blind hole in the middle. It has two main functions. One is to extrude the rivet sleeve during riveting, causing the rivet sleeve to bulge and deform, thus connecting the support plate nut and the base body tightly. The second function is to transform the blind hole in the middle of the extrusion ball head 1-1 into a conical structure through the extrusion deformation of the rivet sleeve, thereby clamping the sealing rubber plug placed in the blind hole in the middle. This allows the sealing rubber plug to be pulled into the center hole of the rivet sleeve during the riveting process.

[0036] Under the continuous pulling action of the rivet gun, the extrusion ball head 1-1 on the core rod 1 will continue to pull towards one end of the conical hole of the rivet sleeve. At this time, the extrusion ball head 1-1 is continuously extruding the inner wall of the rivet sleeve. Under the counter-extrusion force of the inner wall of the rivet sleeve, the diameter of the extrusion ball head 1-1 will gradually shrink, and the inner diameter of the rivet sleeve will become smaller and smaller, presenting a conical inner hole. At this time, the extrusion ball head 1-1 will clamp the inner end 3-5 of the rubber sealing plug 3 more and more tightly until the core rod 1 is completely pulled out of the conical hole end of the rivet sleeve.

[0037] The outer diameter of the smooth rod end 3-2 of the rubber sealing plug 3 is basically the same as the inner diameter of the rivet sleeve (slightly larger than the inner diameter of the rivet sleeve). During riveting, the smooth rod end 3-2 of the rubber sealing plug 3 will temporarily become thinner under the action of tension and will be gradually pulled into the inner hole of the rivet sleeve. After installation, it will return to its original diameter. Since its original diameter is slightly larger than the inner hole diameter of the rivet sleeve, it can completely expand and seal with the inner hole of the rivet sleeve.

[0038] like Figure 7 As shown, with the continuous pulling force acting on the tail of the core rod 1, the core rod 1 will also pull the rubber sealing plug 3 to continue to move backward until the conical end 3-3 of the rubber sealing plug 3 is completely pulled into the conical hole of the nail sleeve. At this time, the smooth end 3-2 of the rubber sealing plug 3 will completely enter the interior of the nail sleeve. Since the outer diameter of the large end 3-1 is larger than that of the smooth end 3-2, it will be stuck in the inner hole of the nail sleeve. Since the inner hole of the nail sleeve is squeezed and pierced by the ball head 1-1 of the core rod 1 into a conical inner hole, the conical inner hole can also provide some resistance for the smooth end 3-2 of the rubber sealing plug 3 to move towards the countersunk end 2-2 of the nail sleeve, preventing the sealing rubber plug from being pulled over or pulled out.

[0039] As the pulling force exerted by the rivet gun on the tail of the core rod 1 continues to increase, the core rod 1 will clamp the outer wrapping end 3-4 and the inner wrapping end 3-5 of the rubber sealing plug 3 by squeezing the ball head 1-1, and continue to pull the rubber sealing plug 3 into the inner hole of the rivet sleeve. Since the breaking force of the pull-off groove of the outer wrapping end 3-4 and the inner wrapping end 3-5 is less than the deformation force of the large end 3-1 of the rubber sealing plug 3, the rubber sealing plug 3 will eventually break off from the pull-off groove of the outer wrapping end 3-4 and the inner wrapping end 3-5.

[0040] After being pulled apart, the conical end 3-3 of the rubber sealing plug 3 will quickly expand and return to its original shape, cooperating with the conical hole of the nail sleeve to function. After the nail is installed, the conical end 3-3 will completely fill and expand in the conical hole of the nail sleeve to achieve a sealing effect, and after being pulled apart, the conical end 3-3 is basically flush with the end face of the nail sleeve. Similarly, the large end 3-1 and the smooth end 3-2 of the rubber sealing plug 3 will also quickly expand and return to their original shape in the inner hole of the nail sleeve after the outer wrapping end 3-4 and the inner wrapping end 3-5 are pulled apart from the pull-off groove, cooperating with the inner hole of the nail sleeve to achieve a sealing effect. Thus, the product achieves a self-sealing effect simultaneously when the riveting is completed.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

[0042] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this application should be included within the protection scope of this application.

Claims

1. A self-sealing type blind rivet for a support plate nut, characterized in that: The pop rivet consists of a core rod, a rivet sleeve, and a sealing rubber plug; The core rod is a slender rod structure. The end of the core rod is installed inside the rivet gun head. The end of the core rod away from the rivet gun head is provided with a compression ball head and a shearing ring. The compression ball head is a spherical structure with a built-in blind hole. The shearing ring undergoes shearing and wire-drawing deformation during riveting to press the sealing rubber plug tightly onto the compression ball head. The nail sleeve is a hollow thin-walled structure. The nail sleeve is sleeved on the core rod and is secured by a retaining ring groove provided on the core rod. The sealing rubber plug is an all-rubber structure. The sealing rubber plug includes a rod, a connecting part, and a wrapping part that are connected to each other. The rod and the connecting part extend into the nail sleeve and cooperate with the nail sleeve to seal. The wrapping part cooperates with the extrusion ball head to wrap and lock, so as to clamp the sealing rubber plug.

2. The self-sealing blind rivet for a support plate nut according to claim 1, characterized in that: The shearing ring has a boss-shaped disc structure. The diameter of the shearing ring on the side near the retaining ring groove is larger than the diameter on the side near the extrusion ball head. The shearing ring on the side near the extrusion ball head is provided with a shearing guide groove.

3. The self-sealing pop rivet for a support plate nut according to claim 1, characterized in that: The retaining ring groove has a raised straight ring pattern, and the outer diameter of the maximum tooth tip of the retaining ring groove is larger than the inner diameter of the nail sleeve.

4. The self-sealing type blind rivet for a support plate nut according to claim 1, characterized in that: The nail sleeve includes a smooth rod and a countersunk head; The optical rod has a thin-walled structure with a central hole, and the countersunk head mates with the mounting hole. The countersunk head has a countersunk conical hole, which works together with the connecting part of the sealing rubber plug to lock the sealing rubber plug.

5. A self-sealing type blind rivet for a support plate nut according to claim 4, characterized in that: The shear ring has a rounded corner at its root near the retaining ring groove to match the rounded corner on the orifice of the optical rod.

6. The self-sealing type blind rivet for a support plate nut according to claim 4, characterized in that: The rod portion of the sealing rubber plug includes a large end and a smooth end. The diameter of the large end is the same as the smooth rod diameter of the nail sleeve and is smaller than the outer diameter of the nail sleeve. The outer diameter of the smooth end is larger than the inner diameter of the nail sleeve.

7. A self-sealing blind rivet for a support plate nut according to claim 4, characterized in that: The connecting part has a conical structure, and the connection between the connecting part and the end of the guide rod is a variable diameter structure. The connecting part is used to mate with the countersunk conical hole of the nail sleeve.

8. A self-sealing type blind rivet for a support plate nut according to claim 4, characterized in that: The wrapping portion includes an outer wrapping end and an inner wrapping end; The outer wrapping end is a thin-walled rubber sleeve structure, and a recessed breakage groove is provided at the root. The inner wrapping end is a solid rotating rubber body, which is located inside the blind hole of the extrusion ball head, and a breakage groove is also provided at the root of the inner wrapping end.

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