High bearing anti-loose split core pull rivet

Abstract

The utility model relates to a high bearing anti -loosening separate type core rivet, including coaxial setting core rod, rivet body, nail cover and lock ring, rivet body, nail cover and lock ring are in order from front to back and are covered on the core rod, the core rod includes the remaining part and the separation part, and the remaining part and the separation part have the neck breaking groove, the remaining part includes the front and back setting rivet head and lock section, the separation part includes the third cylinder section, lock ring limiting section and clamping section who set in order from front to back, the lock ring is C shape structure and has the broken groove, the nail cover is the nail shape structure of the axial through and the big nail shape structure of the small front, and its inside front and back are provided with the middle cavity and the back cavity, and the back cavity and the middle cavity pass through the inner taper surface transition, the core rod will break off at the neck breaking groove, drive ring and separation part take away, and the whole of rivet body, nail cover, lock ring and the remaining part of core rod will remain on the riveted body, and the deformed lock ring will prevent the nail cover and the core rod from opening, and the stress stored in the rivet body will make the above whole tightly fix two riveted bodies, avoids the risk of loosening.

Description

Technical Field

[0001] This utility model relates to the field of riveting technology, and in particular to a high load-bearing, anti-loosening, separable pull rivet. Background Technology

[0002] As a highly efficient riveting tool, the core workflow of a rivet gun is "clamping → pulling → breaking," with the "clamping" action completed by the clamping mechanism. Existing blind rivets have evolved into various structures such as open, countersunk, closed, and bulging types, but they still have the following technical shortcomings in harsh application environments: 1. Decrease in load-bearing capacity: Local annealing process is prone to affecting the performance of the main structure of the nail sleeve if not properly controlled, resulting in a decrease in the shear strength and tensile strength of the nail sleeve, insufficient stress relaxation resistance and vibration resistance, and inability to meet the load-bearing requirements under harsh working conditions; 2. Complex processing technology: Local annealing requires precise control of parameters such as temperature and time, which increases manufacturing difficulty and production cost, and is prone to producing scrap (scrap rate of about 5%-8%); it also has the problem of high processing difficulty, with stringent requirements on the concentricity of the product and the thickness of the material, and extremely high requirements on processing parameters (such as frequency, time, cooling etc.); 3. Unstable bulge forming quality: Uneven annealing can easily cause problems such as inconsistent bulge size and damage to the sheet material, limiting its adaptability; moreover, the stability of local annealing is poor, which is greatly affected by the environment, and the heating area is difficult to control precisely, further aggravating the fluctuation of bulge forming quality. 4. Insufficient installation reliability: Affected by factors such as defects in the local annealing process and insufficient locking ring limit, the rivet installation qualification rate is low, making it difficult to meet the quality control requirements of large-scale production.

[0003] Therefore, it is necessary to improve the locking mechanism of the rivet gun to solve the above problems. Utility Model Content

[0004] The main purpose of this utility model is to provide a high load-bearing, anti-loosening, separable pop rivet that can reduce wear, improve replacement convenience, and enhance clamping stability.

[0005] This utility model achieves the above-mentioned objective through the following technical solution: a high-load-bearing, anti-loosening, separable pull rivet, comprising a core rod, a rivet body, a rivet sleeve, and a locking ring arranged coaxially, wherein the rivet body, the rivet sleeve, and the locking ring are sequentially fitted onto the core rod from front to back; the core rod includes a retaining portion and a separating portion, wherein a necking groove is provided between the retaining portion and the separating portion; the retaining portion includes a rivet head and a locking section arranged front to back; the separating portion includes a third cylindrical section, a locking ring limiting section, and a clamping section arranged front to back; the third cylindrical section matches the minimum inner diameter of the rivet sleeve, and the outer diameter of the locking ring limiting section matches the initial inner diameter of the locking ring. The maximum outer diameter of the separating part is less than or equal to the minimum inner diameter of the nail sleeve; the locking ring has a C-shaped structure and a broken groove, and the locking ring is located outside the locking ring limiting section; the nail sleeve has an axially through-hole nail-shaped structure that is smaller at the front and larger at the back, and its interior has a middle cavity and a rear cavity arranged at the front and back, the inner diameter of the middle cavity is smaller than the inner diameter of the rear cavity, the rear cavity and the middle cavity are transitioned by an inner conical surface, and the inner diameter of the rear cavity is larger than the initial outer diameter of the locking ring.

[0006] Specifically, the rivet sleeve also has a front cavity located at the front of the central cavity, the inner diameter of the front cavity is larger than the inner diameter of the central cavity, the retaining part also includes a first cylindrical section and a second cylindrical section disposed between the rivet head and the locking section, the third cylindrical section has the same outer diameter as the second cylindrical section, and the inner diameter of the front cavity matches the outer diameter of the first cylindrical section.

[0007] Specifically, a locking ring anti-reverse section is provided between the locking ring limiting section and the clamping section, and the inner diameter of the locking ring limiting section is smaller than that of the locking ring anti-reverse section.

[0008] Specifically, the clamping section is provided with several anti-slip teeth.

[0009] Specifically, the locking section has a groove structure and a forward-sloping barb structure on its groove surface.

[0010] Specifically, the rivet body is a tubular structure, with its inner diameter in the middle being larger than the inner diameters at both ends.

[0011] Specifically, the broken groove is inclined to the busbar of the locking ring.

[0012] The beneficial effects of this utility model's technical solution are: 1. During riveting, the core rod will break at the neck groove, the drive ring and the separation part will be removed, and the whole consisting of the rivet body, the rivet sleeve, the locking ring and the retained part of the core rod will remain on the riveted body. The deformed locking ring will prevent the rivet sleeve from separating from the core rod, and the stress stored in the rivet body will make the whole to tightly fix the two riveted bodies, avoiding the risk of loosening. 2. The riveting process eliminates the need for local annealing, ensuring low riveting force and perfect bulge formation while maintaining the rivet's load-bearing strength. This results in low manufacturing costs and a low scrap rate, making it suitable for precision assembly needs in various scenarios. Attached Figure Description

[0013] Figure 1 This is a full sectional view of the high-load-bearing, anti-loosening, separable blind rivet of the embodiment; Figure 2 This is a diagram showing the state of the high-load-bearing, anti-loosening, separable blind rivet before riveting, as illustrated in the example. Figure 3 This is a diagram showing the state of the high-load-bearing, anti-loosening, detachable blind rivet after riveting, as illustrated in the example. Figure 4 This is the front view of the core rod; Figure 5 This is a sectional view of the rivet body; Figure 6 This is a sectional view of the nail sleeve; Figure 7 A 3D view of the lock ring; Figure 8 This is a cross-sectional view of the drive ring.

[0014] The numbers in the diagram represent: 100-High load-bearing, anti-loosening, detachable blind rivet; 1-Core rod, 11-Retaining part, 111-Rivet head, 112-First cylindrical section, 113-Second cylindrical section, 114-Locking section, 12-Separation part, 121-Third cylindrical section, 122-Locking ring limiting section, 123-Locking ring anti-reverse section, 124-Clamping section, 1241-Anti-slip teeth, 13-Neck break groove; 2-rivet body; 3-Sleeve, 31-Anterior cavity, 32-Middle cavity, 33-Rear cavity, 331-Inner conical surface; 4-Locking ring, 41-Broken groove; 200 - Drive ring, 201 - Small toroidal surface, 202 - Large toroidal surface; 300 - The riveted body. Detailed Implementation

[0015] The present invention will be further described in detail below with reference to specific embodiments.

[0016] Example: like Figure 1 and Figure 2 As shown, the present invention provides a high load-bearing, anti-loosening, separable pull rivet 100, which includes a core rod 1, a rivet body 2, a rivet sleeve 3, and a locking ring 4 arranged coaxially. The rivet body 2, the rivet sleeve 3, and the locking ring 4 are sequentially fitted onto the core rod 1 from front to back.

[0017] The high-load-bearing, anti-loosening, separable blind rivet 100 can pass through the rivet holes of two riveted bodies 300. Through riveting deformation, the high-load-bearing, anti-loosening, separable blind rivet 100 rivets the two riveted bodies 300 together.

[0018] like Figure 5 As shown, the rivet 2 is a tubular structure, with the inner diameter of its middle part being larger than the inner diameters of its two ends.

[0019] The rivet body 2 is the component with the greatest deformation in the high-load-bearing, anti-loosening, separable blind rivet 100. Under the action of forces at both ends, its middle part can bulge outward to provide riveting force. Because the middle part of the rivet body 2 is located on the outside and has a thinner wall thickness, during the riveting process, the axial length of the rivet body 2 will decrease, while the middle will expand outward. The internal stress generated during deformation will cause the core rod 1 and the rivet sleeve 3 to move in opposite directions due to the spring force. Its expanded part will abut against one side of the two riveted bodies 300, and cooperate with the rivet sleeve 3 which abuts against the other side of the two riveted bodies 300, thereby securing them tightly. The thin-walled groove of the rivet body guides uniform deformation, improving the integrity and symmetry of the bulge by more than 80%, and ensuring dimensional consistency (RSD≤2%), thus avoiding damage to the sheet metal. By adjusting the rivet body structure (thin-walled / normal annular) and material combination, it can be adapted to the assembly needs of different fields such as aerospace, automotive, and electronics, making it highly practical.

[0020] like Figure 7 As shown, the locking ring 4 has a C-shaped structure and a groove 41, which is inclined to the generatrix of the locking ring 4.

[0021] The locking ring 4 is another deformable component in the high-load-bearing, anti-loosening, separable blind rivet 100. Because it is an incomplete ring, it can deform. In the riveting working environment, the locking ring 4 deforms into a frustum-shaped structure, thereby locking the rivet sleeve 3 and the core rod 1, preventing the complete release of the above-mentioned springback force. The oblique setting of the groove 41 makes the locking ring 4 less prone to jamming during sliding.

[0022] like Figure 6 As shown, the nail sleeve 3 has an axially continuous nail-shaped structure that is smaller at the front and larger at the back. Its interior is provided with a front cavity 31, a middle cavity 32 and a rear cavity 33 in sequence from front to back. The middle cavity 32 has the smallest inner diameter among the three. The rear cavity 33 is connected to the middle cavity 32 through an inner conical surface 331. The inner diameter of the rear cavity 33 is larger than the initial outer diameter of the locking ring 4.

[0023] The front cavity 31 and the middle cavity 32 form an inner stepped structure to mate with the front part of the core rod 1. The rear cavity 33 is the receiving space for the locking ring 4. The inner conical surface 331 is used to radially deform the locking ring 4 to achieve its locking function. The steps of the core rod 1 and the nail sleeve 3 are precisely positioned to ensure the coaxiality of each component, making it suitable for soft sheet materials and high-precision assembly scenarios.

[0024] like Figure 4As shown, the core rod 1 includes a retaining portion 11 and a separating portion 12. A necking groove 13 is provided between the retaining portion 11 and the separating portion 12. The retaining portion 11 includes a rivet head 111, a first cylindrical section 112, a second cylindrical section 113, and a locking section 114, connected from front to back with decreasing diameters. The separating portion 12 includes a third cylindrical section 121, a locking ring limiting section 122, a locking ring anti-reverse section 123, and a clamping section 124, connected from front to back. The third cylindrical section 121 and the second cylindrical section 113 have the same outer diameter and both match the minimum inner diameter of the nail sleeve 3 (i.e., the inner diameter of the central cavity 32). The outer diameter of the locking ring limiting section 122 is smaller than the inner diameter of the locking ring anti-reverse section 123 and matches the initial inner diameter of the locking ring 4. The inner diameter of the front cavity 31 matches the outer diameter of the first cylindrical section 112. The maximum outer diameter of the separating portion 12 is less than or equal to the minimum inner diameter of the nail sleeve 3. The locking section 114 has a groove structure and a forward-sloping barb structure on its groove surface. The clamping section 124 has several anti-slip teeth 1241 on its outside.

[0025] The neck groove 13 is the thinnest part on the core rod 1, so its strength is the lowest. Under a large riveting force, the core rod 1 can break at the neck groove 13. The retained part 11 is the useful part on the core rod 1, used to realize the riveting function; while the separating part 12 is the discarded part on the core rod 1, which only plays the role of transmitting tensile force during the riveting process. The rivet body 2 is initially positioned outside the first cylindrical section 112, the locking ring 4 is positioned outside the locking ring limiting section 122 and in front of the locking ring anti-reverse section 123, and the rivet sleeve 3 can move outside the second cylindrical section 113 and the third cylindrical section 121. The rivet head 111 is used to abut the front end of the rivet body 2, and the rivet sleeve 3 abuts the rear end of the rivet body 2. During riveting, the locking ring 4 and the rivet head 111 continuously approach each other. Under the limited space, the rivet body 2 and the locking ring 4 deform, thereby realizing the riveting. The barbs on the locking section 114 can penetrate the inner wall of the locking ring 4, thereby better preventing the locking ring 4 from slipping out of the locking section 114 after riveting, increasing the assembly qualification rate to over 99%. The clamping head of the rivet gun pulls the core rod 1 through the clamping section 124, and the anti-slip teeth 1241 can be used to prevent the clamping head from slipping on the clamping section 124.

[0026] like Figures 1 to 3 As shown, the working process of this high-load-bearing, anti-loosening, separable pull rivet 100 is as follows: the front section of the core rod 1 first passes through the drive ring 200, and then through the riveting holes of the two riveted bodies 300. The drive ring 200 has a small annular surface 201 and a large annular surface 202. The outer diameter of the large annular surface 202 is larger than the outer diameter of the small annular surface 201, and the outer diameter of the small annular surface 201 is smaller than the inner diameter of the rear cavity 33 (e.g., ...). Figure 2 and Figure 8As shown, the small annular surface 201 aligns with the locking ring 4, the large annular surface 202 contacts the front end face of the rivet gun housing, and the locking section 114 is clamped by the rivet gun's clamping head. The rivet gun's clamping head pulls the core rod 1 backward, while the rivet gun housing pushes the drive ring 200 forward. The small annular surface 201 causes the locking ring 4 to move forward relative to the core rod 1, starting from the locking ring limiting section 122, and then enter the rear cavity 33 of the rivet sleeve 3. When the locking ring 4 contacts the inner conical surface 331, the rivet body 2 will begin to bulge and deform under the pressure of the rivet sleeve 3 and the two ends of the rivet head 111. The deformed rivet body 2 and the outer wall of the rivet sleeve 3 will clamp the two riveted bodies 300. During the deformation of the rivet 2, the radial inward reaction force generated by the inner conical surface 331 on the locking ring 4 will gradually increase. When the locking ring 4 reaches the locking section 114, its front diameter will decrease, forming a blocking structure that fills the outer wall of the locking section 114 and the inner wall of the rear cavity 33. Continuing to pull the clamping section 124, the core rod 1 will break at the neck groove 13, and the drive ring 200 and the separation part 12 will be removed. The entire assembly consisting of the rivet 2, the rivet sleeve 3, the locking ring 4, and the retained part 11 of the core rod 1 will remain on the riveted body 300. The deformed locking ring 4 will prevent the rivet sleeve 3 from separating from the core rod 1, and the stress stored in the rivet 2 will cause the entire assembly to tightly fix the two riveted bodies 300, avoiding the risk of loosening.

[0027] The riveting process eliminates the need for partial annealing, ensuring low riveting force and perfect bulge formation while maintaining the rivet's load-bearing strength. This results in low manufacturing costs and a low scrap rate, making it suitable for precision assembly needs in various scenarios. The processing time is shortened by 30%, and the scrap rate is reduced to below 1%; no dedicated annealing equipment is required, reducing manufacturing costs by 20%-30%. The above descriptions are merely some embodiments of this utility model. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this utility model, and all such modifications and improvements fall within the protection scope of this utility model.

Claims

1. A high-load-bearing, anti-loosening, separable blind rivet, characterized in that: The device includes a core rod, a rivet body, a rivet sleeve, and a locking ring arranged coaxially. The rivet body, the rivet sleeve, and the locking ring are sequentially fitted onto the core rod from front to back. The core rod includes a retaining portion and a separating portion, with a necking groove between the retaining portion and the separating portion. The retaining portion includes a rivet head and a locking section arranged front to back. The separating portion includes a third cylindrical section, a locking ring limiting section, and a clamping section arranged front to back. The third cylindrical section matches the minimum inner diameter of the rivet sleeve, and the outer diameter of the locking ring limiting section matches the initial inner diameter of the locking ring. The maximum outer diameter of the separating portion is less than or equal to the minimum inner diameter of the rivet sleeve. The locking ring has a C-shaped structure and a break groove, and is located outside the locking ring limiting section. The rivet sleeve has an axially continuous nail-shaped structure that is smaller at the front and larger at the back. It has a middle cavity and a rear cavity arranged front to back. The inner diameter of the middle cavity is smaller than the inner diameter of the rear cavity. The rear cavity and the middle cavity are transitioned by an inner conical surface. The inner diameter of the rear cavity is larger than the initial outer diameter of the locking ring.

2. The high-load-bearing, anti-loosening, separable blind rivet according to claim 1, characterized in that: The rivet sleeve also has a front cavity located at the front of the middle cavity. The inner diameter of the front cavity is larger than the inner diameter of the middle cavity. The retaining part also includes a first cylindrical section and a second cylindrical section disposed between the rivet head and the locking section. The outer diameter of the third cylindrical section is the same as that of the second cylindrical section. The inner diameter of the front cavity matches the outer diameter of the first cylindrical section.

3. The high-load-bearing, anti-loosening, separable blind rivet according to claim 1, characterized in that: A locking ring anti-reverse section is provided between the locking ring limiting section and the clamping section, and the inner diameter of the locking ring limiting section is smaller than that of the locking ring anti-reverse section.

4. The high-load-bearing, anti-loosening, separable blind rivet according to claim 1, characterized in that: The clamping section is provided with several anti-slip teeth.

5. The high-load-bearing, anti-loosening, separable blind rivet according to claim 1, characterized in that: The locking section has a groove structure and a forward-sloping barb structure on its groove surface.

6. The high-load-bearing, anti-loosening, separable blind rivet according to claim 1, characterized in that: The rivet body is a tubular structure, with its inner diameter in the middle being larger than the inner diameters at both ends.

7. The high-load-bearing, anti-loosening, separable blind rivet according to claim 1, characterized in that: The broken groove is inclined to the busbar of the locking ring.

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