A core-pulling rivet assembly device and assembly method for aerospace
Through the bidirectional linkage rivet assembly device, the lock ring is uniformly deformed in the locking area, solving the problem that the lock ring cannot fully enter the locking area, and improving the locking performance and assembly efficiency of the rivets.
Patent Information
- Application Number
- CN202411443137.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-16
- Publication Date
- 2025-07-29
- Estimated Expiration
- 2044-10-16
AI Technical Summary
During the rivet riveting process, the lock ring cannot fully enter the locking area, resulting in limited improvement in the rivet's riveting strength and self-locking performance. There is a gap between the lock ring and the core rod and the nail sleeve, which affects the riveting effect.
A two-way linked rivet assembly device is adopted to cover the lock ring by covering the gun head jacket, so that the lock ring is uniformly deformed in the lock area. The active movement of the lock ring is achieved by the cooperation of the gun head inner sleeve and the double claws to ensure that the lock ring is closely cooperating in the lock area.
It improves the locking performance and assembly efficiency of the rivet, solves the problem of deformation of the lock ring outside the locking area, and improves the vibration and loosening resistance of the rivet.
Smart Images
Figure CN119237646B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a core-pulling rivet assembly device and an assembly method for aerospace applications, belonging to the technical field of rivet fastening. Background Art
[0002] Rivets are one of the most demanded fasteners in the aerospace field, mainly used for connecting aircraft skin panels, and the single-aircraft consumption can exceed millions of pieces. With the development of the national aerospace field, the application demand for self-locking rivets is also increasing. Requirements such as reducing wind resistance and preventing loosening make the contribution of the self-lightweight and anti-loosening properties of rivet products particularly prominent during flight.
[0003] As a single-sided connection product structure, in order to ensure that such products have stronger anti-vibration and anti-loosening capabilities, higher requirements are put forward for the self-locking performance of the rivets. A locking structure needs to be set on the rivet products to enhance the self-locking function of the rivets. Therefore, a lock ring is added to the self-locking rivets. Of course, in order to avoid the weight gain caused by the additive material, "rolling grooves" can also be set on the core rod of the rivet. The cooperation of the improved sleeve, core rod, and lock ring indeed increases the riveting strength of the rivet, improves the self-locking performance, and at the same time can meet the requirements of rivet lightweight and is widely used.
[0004] Although the rivet has added a lock ring structure to meet the requirements of locking performance, the riveting process for the rivet with a lock ring has not been improved. The riveting process adopts a "single-action" design. By pulling the core rod in one direction, the lock ring is passively squeezed into the "locking area" between the core rod and the sleeve. When pulling the core rod, only part of the lock ring can enter the locking area and deform, and there is still a part that deforms outside the locking area, which will cause the lock ring to not completely fill the locking area and there is a gap with the "locking area". The gap between the lock ring and the core rod and the sleeve causes it to not fit tightly with the core rod and the sleeve, which will not only affect the riveting strength of the rivet, but also the improvement of the self-locking performance of the rivet with a lock ring is very limited. Therefore, there is an urgent need for an aerospace core rivet assembly device and an assembly method that can change the movement form of the lock ring during riveting of the rivet, so that the lock ring can actively enter the locking area, and the lock ring after riveting can fit tightly with the core rod and the sleeve, thereby making up for the adverse effects of passive extrusion and loose combination. Summary of the Invention
[0005] In view of the deficiencies of the prior art, the present invention provides a core-pulling rivet assembly device and an assembly method for aerospace applications.
[0006] The present invention solves the above-mentioned technical problems with the following technical solutions: an assembly device for aerospace blind rivets, the rivet comprising a core rod, a rivet sleeve sleeved on the outside of the core rod, and a locking ring; comprising a gun head outer sleeve, a gun head middle sleeve arranged in the gun head outer sleeve, a gun head, two claws, an ejector pin, and an ejector pin sleeve;
[0007] The gun head outer sleeve is arranged on the gun body outer sleeve, and the gun head middle sleeve can move toward the gun head under the action of the gun body middle sleeve. The gun head inner sleeve is connected to the gun body sleeve and can slide forward and backward along its axial direction under the action of the gun body sleeve. When the gun head inner sleeve moves backward, the gun head inner sleeve can act on the double claws to enable it to clamp the core rod and move backward. The ejector sleeve is slidably arranged in the gun body sleeve and the gun head inner sleeve, and a gun head tail spring is further provided between the ejector sleeve and the gun body sleeve. The ejector is slidably arranged in the ejector sleeve, and an ejector spring is further provided between the ejector and the ejector sleeve.
[0008] The double claws are located in the inner sleeve of the gun head in front of the ejector, and the double claws are connected to form a claw hole for the core rod and the ejector to pass through; a socket for the core rod to pass through is provided in the gun head, a gun nozzle is provided at the front end of the gun head, and an outer sleeve nozzle is provided at the front end of the gun head outer sleeve. When riveting, the front end surface of the outer sleeve nozzle can act on the head of the nail sleeve, and the gun nozzle can move forward under the action of the gun head inner sleeve to act on the rear end surface of the locking ring, and the outer sleeve nozzle can cover the outside of the locking ring and the gun nozzle.
[0009] The beneficial effects of the present invention are as follows: the assembly device adopts a two-way linked motion mode to assemble the rivet, that is, the one-time assembly and forming of the core-pulling rivet is completed by the two actions of pulling in and pushing out, and the locking ring is covered with the gun head jacket to prevent the locking ring from deforming, so that the locking ring avoids non-active deformation during the deformation process, so that it can smoothly enter the locking area between the nail sleeve and the core rod, and perform active deformation in the locking area, ensuring that the locking ring is uniformly deformed in the locking area, thereby ensuring the stability of the locking ring. The double-action mode avoids the existing single-action mode of applying passive extrusion to the locking ring, so that the locking ring produces non-active deformation before reaching the locking area, further improving the active movement trend of the locking ring, so that the locking ring can be evenly deformed after reaching the locking area, thereby improving the locking performance of the rivet and ensuring the consistency of the locking performance after riveting. In summary, the present invention has a simple structure and is easy to operate. It ensures that the locking ring is fully filled in the locking area of the rivet product under double-action riveting assembly, and solves the problem of deformation of the locking ring outside the locking area affecting the locking performance of the rivet caused by single-action riveting in the past. It not only improves the locking performance of the rivet, but also improves the assembly efficiency of the rivet.
[0010] Based on the above technical solution, the present invention can also be improved as follows.
[0011] Further, an inner sleeve inclined surface is provided inside the inner sleeve of the gun head, and a claw inclined surface adapted to the inner sleeve inclined surface is provided on the double claws. When the inner sleeve of the gun head moves backward, the inner sleeve inclined surface can act on the claw inclined surface, so that the double claws generate a clamping force on the core rod to pull the core rod backward; a gun inclined surface is provided at the rear end of the gun head. When the double claws move forward and contact the gun head, the gun inclined surface contacts the claw inclined surface, and under the elastic force of the gun head tail spring, the double claws generate an opening angle, so that the core rod is separated from the double claws.
[0012] The beneficial effect of adopting the above further solution is that the inner sleeve inclined surface can act on the claw inclined surface when the inner sleeve of the gun head moves backward. The two cooperate to enable the double claws to generate a force to clamp the core rod and pull the core rod backward; this solves the problem of the backward pull of the core rod of the blind rivet. After the blind rivet is assembled, it is necessary to eject the broken core rod. The inner sleeve of the gun head is reset, and the gun head tail spring releases pressure to push the thimble sleeve forward. When the double claws move to contact the gun head, through the cooperation of the gun inclined surface and the claw inclined surface, the front ends of the double claws can be opened, the core rod can be separated from the double claws, and the core rod can be ejected from the gun head under the action of the thimble to complete the material ejection.
[0013] Further, a middle ring convex is also provided in the middle of the gun head. The outer peripheral surface of the middle ring convex is bent backward to form a ring sleeve structure, and the middle sleeve of the gun head can push the gun head forward by acting on the ring sleeve structure.
[0014] The beneficial effect of adopting the above further solution is that when the core rod moves backward to the end of the stroke, the middle sleeve of the gun head starts to move forward to generate a thrust acting on the gun head, so that the gun head moves forward to smoothly push the lock ring covered by the gun head outer sleeve into the locking area between the core rod and the nail kit. In order to enable the middle sleeve of the gun head to act on the gun head, a middle ring convex and a ring sleeve structure are designed on the outer periphery of the gun head, so that the middle sleeve of the gun head can drive the forward movement of the gun head by acting on the ring sleeve structure when moving forward.
[0015] Further, the double claws include a pair of clamping claws and also include a claw pin penetrating the double claws. Corresponding pin holes for the claw pin to pass through are provided on the clamping claws.
[0016] The beneficial effect of adopting the above further solution is that the double claws are inside the inner sleeve of the gun head. If there is no claw pin between them, the clamping claws may be misaligned front and back. To avoid this situation, a claw pin is added between the pair of clamping claws, and the axial consistency of the pair of clamping claws is ensured by the claw pin radially inserted into the clamping claws.
[0017] Further, a limiting ring convex is provided on the thimble, a limiting shoulder matching with the limiting ring convex is provided on the thimble sleeve, a thimble sleeve rear seat is provided at the rear end of the thimble sleeve, the thimble spring is arranged between the thimble sleeve seat and the thimble, and the gun head tail spring is arranged between the inner sleeve of the gun body and the thimble sleeve rear seat.
[0018] The beneficial effect of adopting the above further scheme is that the thimble can push out the broken core rod under the action of the thimble spring. A limiting ring convex with a relatively large outer diameter is arranged on the thimble, and the limiting shoulder is used to limit the absorption ring convex to prevent the thimble from detaching from the thimble sleeve. This means that the thimble needs to be assembled from the tail of the thimble sleeve, so a thimble sleeve rear seat is arranged at the tail of the thimble sleeve. In this way, the thimble spring acting on the thimble sleeve and the gun head tail spring can both act on the thimble sleeve rear seat.
[0019] Further, the inner sleeve of the gun head is threadedly connected with the inner sleeve of the gun body.
[0020] The beneficial effect of adopting the above further scheme is that the threaded connection is convenient, realizing the connection between the inner sleeve of the gun body and the inner sleeve of the gun head, and preparing for the driving of the inner sleeve of the gun body for the forward and backward movement of the inner sleeve of the gun head.
[0021] Further, a tail ring groove is provided on the core rod, and an inner ring groove matching with the tail ring groove is provided on the inner wall of the double claw.
[0022] The beneficial effect of adopting the above further scheme is that compared with a smooth surface, the cooperation between the inner ring groove and the tail ring groove makes the clamping effect of the double claw on the core rod better.
[0023] Further, the outer sleeve of the gun head is connected with the outer sleeve of the gun body through a connecting mechanism. The connecting mechanism includes a connecting seat and a connecting end cover. The connecting seat is arranged on the outer sleeve of the gun body, and an external thread for threaded connection with the connecting end cover is provided on the connecting seat. An outer sleeve convex ring is provided on the outer surface of the gun head outer sleeve, and an outer sleeve hole is provided on the connecting end cover. The outer diameter of the outer sleeve convex ring is larger than the aperture of the outer sleeve hole.
[0024] The beneficial effect of adopting the above further scheme is that the connecting end cover is sleeved on the gun head outer sleeve from the head end. The end face of the cover body of the connecting end cover acts on the outer sleeve convex ring, and the inner wall of the cover body is threadedly connected with the connecting seat, realizing the connection between the gun head and the gun body.
[0025] Further, a middle sleeve convex ring is provided on the outer surface of the middle sleeve of the gun head, and a limiting ring groove for the middle sleeve convex ring to move is provided on the connecting seat or between the connecting seat and the gun head outer sleeve.
[0026] The beneficial effects of adopting the above further solution are that the cooperation between the middle sleeve convex ring and the limit ring groove can limit the movement range of the gun head middle sleeve, and limit the forward and backward positions of the gun head middle sleeve, so as to ensure that when the gun head middle sleeve moves forward, it can act on the gun head so that the front end of the gun head can act on the locking ring to smoothly push the locking ring covered in the gun head outer sleeve into the locking area formed between the core rod and the nail sleeve, and can make the locking ring stop moving after reaching the position, so as to complete the expansion of the locking ring in the locking area. After the locking ring is deformed, it can be closely matched with the core rod and the nail sleeve.
[0027] The present invention also discloses an assembly method for a blind rivet for aerospace, which adopts the above-mentioned assembly device for a blind rivet for aerospace, and the specific steps are as follows:
[0028] 1) Insert the core rod of the rivet into the gun head. The rod knurling on the core rod acts on the nail sleeve through the locking ring, and the rivet is inserted into the hole position of the mounting plate;
[0029] 2) The ejector pin moves backward under the action of the core rod until the rear part of the core rod is inserted between the two claws. The front end of the gun head outer sleeve acts on the nail sleeve, and the locking ring of the rivet is covered in the gun head outer sleeve. The inner sleeve of the gun head moves backward and acts on the two claws, so that the two claws generate a clamping force on the rear part of the core rod, and then pull the core rod backward. The nail sleeve is always in contact with the mounting plate under the action of the gun head outer sleeve;
[0030] 3) The inner sleeve of the gun head continues to pull the core rod backward until the end of the stroke. At this time, the neck-breaking groove of the rivet reaches the outer end face of the nail sleeve and is flush with the mounting surface of the mounting plate;
[0031] 4) The middle sleeve of the gun head starts to move forward and generates a thrust acting on the gun head. The gun head moves forward and pushes the locking ring covered by the gun head outer sleeve into the locking area formed between the core rod and the nail sleeve. As the gun head moves, the locking ring stops moving after reaching the position, and then completes the expansion in the locking area. After the locking ring is deformed, it can be closely matched with the core rod and the nail sleeve;
[0032] 5) When the locking ring expands to the point where it cannot be deformed, the core rod breaks from the neck-breaking groove, and the process part of the core rod is separated from the working part to complete the riveting process of the rivet;
[0033] 6) The inner sleeve of the gun head resets and approaches the gun head. The spring at the tail of the gun head releases pressure and pushes the ejector pin sleeve forward. When the two claws contact the gun head, the gun bevel surface of the gun head contacts the claw bevel surface of the two claws, and under the elastic force of the spring at the tail of the gun head, the two claws generate an opening angle, so that the two claws are separated from the core rod, and the ejector pin will push the core rod out of the gun head under the action of the ejector pin spring to complete the material ejection.
[0034] The beneficial effects of the present invention are as follows: By means of a riveting and assembling device that changes from "single-acting" to "double-acting", the present invention realizes the reliability of the single-sided connection of self-locking blind rivet products and improves their own locking performance. The present invention realizes the provision of a "double-acting" assembling device for rivet products, improves the riveting effect of self-locking rivets, ensures the tight combination of the "locking ring" and the "locking area" of the rivets, and improves the anti-vibration and anti-loosening capabilities of the rivets. BRIEF DESCRIPTION OF THE DRAWINGS
[0035] Figure 1 is a schematic structural diagram of the blind rivet assembling device of the present invention;
[0036] Figure 2 is a schematic structural diagram of the gun head of the present invention;
[0037] Figure 3 is a schematic structural diagram of the blind rivet;
[0038] Figure 4 is a schematic structural diagram of the original state before riveting of the present invention;
[0039] Figure 5 is a schematic structural diagram of the state of pulling the core rod during riveting of the present invention;
[0040] Figure 6 is a schematic structural diagram of the state after pulling in during riveting of the present invention;
[0041] Figure 7 is a schematic structural diagram of the state after riveting of the present invention;
[0042] Figure 8 is a schematic structural diagram of the state of ejecting the material of the present invention;
[0043] Figure 9 is a schematic structural diagram of the process of blind rivet riveting;
[0044] In the figures, 1. outer sleeve of the gun head; 101. convex ring of the outer sleeve; 2. middle sleeve of the gun head; 201. convex ring of the middle sleeve; 3. inner sleeve of the gun head; 301. inclined surface of the inner sleeve; 4. gun head; 41. gun nozzle; 42. middle ring convex; 43. ring sleeve structure; 44. gun inclined surface; 5. double claws; 51. inclined surface of the claws; 6. claw pin; 7. thimble sleeve; 8. thimble; 9. thimble spring; 10. rear seat of the thimble sleeve; 11. tail spring of the gun head; 12. mounting plate; 13. connecting seat; 14. rivet; 141. core rod; 1411. tail ring groove; 1412. neck-breaking groove; 1413. knurling of the rod; 142. nail sleeve; 143. locking ring; 144. locking area; 15. outer sleeve of the gun body; 16. middle sleeve of the gun body; 17. inner sleeve of the gun body. DETAILED DESCRIPTION OF THE INVENTION
[0045] The principles and features of the present invention will be described below in conjunction with examples. The examples are only used to explain the present invention and are not intended to limit the scope of the present invention.
[0046] As Figures 1-9 shown, a core-pulling rivet assembly device for aerospace applications, the rivet 14 includes a core rod 141, a nail sleeve 142 sleeved outside the core rod 141, and a lock ring 143; it includes a gun head outer sleeve 1, a gun head middle sleeve 2, a gun head inner sleeve 3, a gun head 4, a double claw 5, a thimble 8, and a thimble sleeve 7 provided inside the gun head outer sleeve 1;
[0047] The gun head outer sleeve 1 is arranged on the gun body outer sleeve 15, the gun head middle sleeve 2 can move towards the direction of the gun head 4 under the action of the gun body middle sleeve 16, the gun head inner sleeve 3 is connected to the gun body inner sleeve 17 and can slide back and forth along its axis under the action of the gun body inner sleeve 17. When the gun head inner sleeve 3 moves backward, the gun head inner sleeve 3 can act on the double claw 5 to clamp the core rod 141 and move it backward. The thimble sleeve 7 is slidably arranged in the gun body inner sleeve 17 and the gun head inner sleeve 3, and a gun head tail spring 11 is also arranged between the thimble sleeve 7 and the gun body inner sleeve 17. The thimble 8 is slidably arranged in the thimble sleeve 7, and a thimble spring 9 is also arranged between the thimble 8 and the thimble sleeve 7;
[0048] The double claw 5 is located in the gun head inner sleeve 3 in front of the thimble 8. The double claw 5 is butted to form a claw hole for the core rod 141 and the thimble 8 to pass through. The gun head 4 is provided with a jack for the core rod 141 to pass through. The front end of the gun head 4 is provided with a gun nozzle 41, and the front end of the gun head outer sleeve 1 is provided with an outer sleeve nozzle. When the rivet 14 is riveted, the front end face of the outer sleeve nozzle can act on the head of the nail sleeve 142, and the gun nozzle 41 can move forward under the action of the gun head middle sleeve 2 to act on the rear end face of the lock ring 143, and the outer sleeve nozzle can cover the outside of the lock ring 143 and the gun nozzle 41.
[0049] The inner sleeve 3 of the gun head is provided with an inner sleeve inclined surface 301, and the double claws 5 are provided with claw inclined surfaces 51 adapted to the inner sleeve inclined surface 301. When the inner sleeve 3 of the gun head moves backward, the inner sleeve inclined surface 301 can act on the claw inclined surface 51, so that the double claws 5 generate a clamping force on the core rod 141 to pull the core rod 141 backward; the rear end of the gun head 4 is provided with a gun inclined surface 44. When the double claws 5 move forward and contact the gun head 4, the gun inclined surface 44 contacts the claw inclined surface 51, and under the elastic force of the gun head tail spring 11, the double claws 5 generate an opening angle, so that the core rod 141 is separated from the double claws 5. The inner sleeve inclined surface 301 can act on the claw inclined surface 51 when the inner sleeve of the gun head moves backward. The two cooperate so that the double claws 5 can generate a force to clamp the core rod 141 and pull the core rod 141 backward; this solves the problem of the backward pull of the core rod 141 of the blind rivet 14; after the blind rivet 14 is assembled, the broken core rod 141 needs to be ejected. The inner sleeve 3 of the gun head is reset, and the gun head tail spring 11 releases pressure to push the thimble sleeve 7 forward. When the double claws 5 move to contact the gun head 4, through the cooperation of the gun inclined surface 44 and the claw inclined surface 51, the front ends of the double claws 5 can be opened, and the core rod 141 can be separated from the double claws 5, and the core rod 141 can be ejected from the gun head 4 under the action of the thimble 8 to complete the material ejection.
[0050] The middle part of the gun head 4 is also provided with a middle ring convex 42. The outer peripheral surface of the middle ring convex 42 is bent backward to form a ring sleeve structure 43. The middle sleeve 2 of the gun head can push the gun head 4 forward by acting on the ring sleeve structure 43. When the core rod 141 moves backward to the end of the stroke, the middle sleeve 2 of the gun head starts to move forward to generate a thrust acting on the gun head 4, so that the gun head 4 moves forward to smoothly push the lock ring 143 wrapped by the gun head outer sleeve 1 into the locking area between the core rod 141 and the nail sleeve 142. In order to enable the middle sleeve 2 of the gun head to act on the gun head 4, the middle ring convex 42 and the ring sleeve structure 43 are designed on the outer periphery of the gun head 4, so that the middle sleeve 2 of the gun head can drive the forward movement of the gun head 4 by acting on the ring sleeve structure 43 when moving forward.
[0051] The double claws 5 include a pair of clamping claws and also include a claw pin 6 penetrating through the double claws 5. The clamping claws are correspondingly provided with pin holes for the claw pin 6 to pass through. The double claws 5 are inside the inner sleeve 3 of the gun head. If there is no claw pin 6 between them, there may be a situation where the clamping claws are misaligned front and back. To avoid this situation, a claw pin 6 is added between the pair of clamping claws. The axial consistency of the pair of clamping claws is ensured by the claw pin 6 radially inserted into the clamping claws.
[0052] A limiting ring convex is provided on the thimble 8, a limiting shoulder that mates with the limiting ring convex is provided on the thimble sleeve 7, a thimble sleeve rear seat 10 is provided at the rear end of the thimble sleeve 7, a thimble spring 9 is disposed between the seat of the thimble sleeve 7 and the thimble 8, and a gun head tail spring 11 is disposed between the inner sleeve 17 of the gun body and the thimble sleeve rear seat 10. The thimble 8 can push out the broken core rod 141 under the action of the thimble spring 9. A limiting ring convex with a relatively large outer diameter is provided on the thimble 8, and the limiting shoulder is used to limit the limiting ring convex to prevent the thimble 8 from disengaging from the thimble sleeve 7. This means that the thimble 8 needs to be assembled from the tail of the thimble sleeve 7, so the thimble sleeve rear seat 10 is provided at the tail of the thimble sleeve 7, so that the thimble spring 9 and the gun head tail spring 11 acting on the thimble sleeve 7 can both act on the thimble sleeve rear seat 10.
[0053] The inner sleeve 3 of the gun head is threadedly connected to the inner sleeve 17 of the gun body. Threaded connection is convenient, realizing the connection between the inner sleeve 17 of the gun body and the inner sleeve 3 of the gun head, and preparing for the driving of the inner sleeve 17 of the gun body for the forward and backward movement of the inner sleeve 3 of the gun head.
[0054] A tail ring groove 1411 is provided on the core rod 141, and an inner ring groove that mates with the tail ring groove 1411 is provided on the inner wall of the double claw 5. Compared with a smooth surface, the cooperation between the inner ring groove and the tail ring groove 1411 results in a better clamping effect of the double claw 5 on the core rod 141.
[0055] The outer sleeve 1 of the gun head is connected to the outer sleeve 15 of the gun body through a connection mechanism. The connection mechanism includes a connection seat 13 and a connection end cover. The connection seat 13 is provided on the outer sleeve 15 of the gun body. The connection seat 13 is provided with an external thread that is threadedly connected to the connection end cover. An outer sleeve convex ring 101 is provided on the outer surface of the outer sleeve 1 of the gun head, and an outer sleeve hole is provided on the connection end cover. The outer diameter of the outer sleeve convex ring 101 is greater than the aperture of the outer sleeve hole. The connection end cover is sleeved on the outer sleeve 1 of the gun head from the head end, the end face of the cover body of the connection end cover acts on the outer sleeve convex ring 101, and the inner wall of the cover body is threadedly connected to the connection seat 13, realizing the connection between the gun head 4 and the gun body.
[0056] On the outer surface of the middle sleeve 2 of the gun head, there is a middle sleeve convex ring 201. A limit ring groove for the movement of the middle sleeve convex ring 201 is provided on the connecting seat 13 or between the connecting seat 13 and the gun head outer sleeve 1. The cooperation between the middle sleeve convex ring 201 and the limit ring groove can limit the movement range of the gun head middle sleeve 2, and limit the forward and backward positions of the gun head middle sleeve 2, so as to ensure that when the gun head middle sleeve 2 moves forward, it can act on the gun head 4, so that the front end of the gun head 4 can act on the locking ring 143, and smoothly push the locking ring 143 wrapped in the gun head outer sleeve 1 into the locking area formed between the core rod 141 and the nail sleeve 142, and can stop the movement after the locking ring 143 reaches the position, so as to complete the expansion of the locking ring 143 in the locking area. After the locking ring 143 is deformed, it can be closely matched with the core rod 141 and the nail sleeve 142.
[0057] As Figures 4-9 shown, the present invention also discloses an assembly method for a blind rivet used in aerospace. Using the above-mentioned assembly device for a blind rivet used in aerospace, the specific steps are as follows:
[0058] 1) Insert the core rod 141 of the rivet 14 into the gun head 4. The rod knurling 1413 of the core rod 141 acts on the nail sleeve 142 through the locking ring 143, and insert the rivet 14 into the hole position of the mounting plate 12.
[0059] 2) The ejector pin 8 moves backward under the action of the core rod 141 until the rear part of the core rod 141 is inserted between the double claws 5. The front end of the gun head outer sleeve 1 acts on the nail sleeve 142. The locking ring 143 of the rivet 14 is wrapped in the gun head outer sleeve 1. The inner gun head sleeve 3 moves backward and acts on the double claws 5, so that the double claws 5 generate a clamping force on the rear part of the core rod 141, and then pull the core rod 141 to move backward. The nail sleeve 142 is always kept in contact with the mounting plate 12 under the action of the gun head outer sleeve 1.
[0060] 3) The inner gun head sleeve 3 continues to pull the core rod 141 backward until the end of the stroke. At this time, the neck-breaking groove 1412 of the rivet 14 reaches the outer end face of the nail sleeve 142 and is flush with the mounting surface of the mounting plate 12.
[0061] 4) The gun head middle sleeve 2 starts to move forward and generates a thrust acting on the gun head 4. The gun head 4 moves forward and pushes the locking ring 143 wrapped by the gun head outer sleeve 1 into the locking area formed between the core rod 141 and the nail sleeve 142. As the gun head 4 moves, the locking ring 143 stops moving after reaching the position, and then completes the expansion in the locking area. After the locking ring 143 is deformed, it can be closely matched with the core rod 141 and the nail sleeve 142.
[0062] 5) When the locking ring 143 expands to the point where it cannot be deformed, the core rod 141 breaks from the neck-breaking groove 1412, and the process part of the core rod 141 is separated from the working part to complete the riveting process of the rivet 14.
[0063] 6) The inner sleeve 3 of the gun head returns and approaches the gun head 4. The spring at the tail of the gun head 4 releases pressure and pushes the thimble sleeve 7 forward. When the double claw 5 contacts the gun head 4, the gun bevel 44 of the gun head 4 contacts the claw bevel 51 of the double claw 5, and the double claw 5 generates an opening angle under the elastic force of the gun head tail spring 11, causing the double claw 5 to separate from the core rod 141. The thimble 8 will push the core rod 141 out of the gun head 4 under the action of the thimble spring 9 to complete the material ejection.
[0064] The outer diameter of the knurled rod is larger than the outer diameter of the core rod at its installation position and smaller than the aperture of the gun head.
[0065] This core rivet assembly device can be applied to a pneumatic riveting gun. By the movement of the riveting gun, the pulling-in and pushing-out actions of the gun head 4 are ensured, and the assembly of the self-locking blind rivet 14 is completed using one complete stroke of the riveting gun: First, load the rivet 14 into the gun head 4 and load the rivet 14 into the hole position of the mounting plate 12. The rod knurling 1413 on the core rod 141 will act on the lock ring 143 and then indirectly act on the nail sleeve 142. The rivet is loaded onto the mounting plate through the rod knurling 1413 to ensure that the rivet 14 is between the gun head 4 and the mounting plate 12, as Figure 4 shown. At this time, the thimble 8 will move backward under the action of the core rod 141 until the core rod 141 reaches the position of the double claw 5. At this time, the gun head 4 is slightly sunken in the gun head outer sleeve 1, so that the lock ring 143 is covered in the gun head outer sleeve 1; when riveting starts, the inner sleeve 3 of the gun head moves backward. Subsequently, the inner bevel of the inner sleeve 3 of the gun head contacts the claw bevel 51 of the double claw 5, causing the double claw 5 to generate a clamping force on the tail ring groove 1411 of the core rod 141, thereby pulling the core rod 141 backward. At this time, the nail sleeve 142 always remains in contact with the mounting plate 12 under the reaction force of the gun head outer sleeve 1, as Figure 5 shown; Next, the double claw 5 continues to generate a pulling force to drive the core rod 141 to move until the end of the stroke is reached. At this time, the neck-breaking groove 1412 of the rivet 14 reaches the end face of the nail sleeve 142 and is flush with the mounting surface of the mounting plate 12, as Figure 6 shown; Subsequently, the middle sleeve 2 of the gun head starts to move forward and generates a thrust acting on the gun head 4. The gun head 4 then continues to move forward and smoothly pushes the lock ring 143 covered by the gun head outer sleeve 1 into the locking area formed between the core rod 141 and the nail sleeve 142. As the gun head 4 moves and the lock ring 143 reaches the position, it stops moving and then completes the expansion of the lock ring 143 in the locking area cavity, causing the lock ring 143 to deform and tightly fit with the core rod 141 and the nail sleeve 142, as Figure 7As shown; when the lock ring 143 expands to the point where it can no longer deform, the core rod 141 breaks from the broken neck groove 1412, and the process part of the core rod 141 is separated from the working part to complete the entire riveting process. At this time, the inner sleeve 3 of the gun head will return to its initial position close to the gun head 4. At this time, the tail spring 11 of the gun head releases the pressure to push the ejector sleeve 7 forward. When the double claws 5 come into contact with the gun head 4, the gun bevel 44 on the inside of the gun head 4 contacts the claw bevel 51 of the double claws 5, and under the action of the elastic force, an angle is generated, so that the inner groove of the double claws 5 is separated from the tail ring groove 1411 of the core rod 141. At this time, the ejector 8 will eject the core rod 141 from the gun head 4 under the action of the ejector spring 9 to complete the material removal. Figure 8 As shown. The present invention provides a "double-action" assembly device and assembly method for the installation of rivet 14 products. This ensures that, during "double-action" riveting, the locking ring 143 is fully filled in the locking area, resolving the deformation of the locking ring 143 outside the locking area caused by previous "single-action" riveting, thereby improving locking performance. Furthermore, the riveting and stripping process is completed in one step, increasing riveting efficiency. This improves the riveting effect of the self-locking blind rivet 14, ensures that the "locking ring" and "locking area" of the rivet are tightly coupled, and enhances the rivet's vibration resistance and anti-loosening capabilities.
[0066] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims
1. A core-pulling rivet assembly device for aerospace applications, wherein the rivet (14) comprises a core rod (141), a rod knurl (1413) provided on the core rod (141), a nail sleeve (142) sleeved outside the core rod (141), and a locking ring (143); characterized in that, It includes a gun head outer sleeve (1), a gun head middle sleeve (2), a gun head inner sleeve (3), a gun head (4), a double claw (5), a thimble (8) and a thimble sleeve (7) arranged inside the gun head outer sleeve (1); The gun head outer sleeve (1) is arranged on the gun body outer sleeve (15). The gun head middle sleeve (2) can move towards the gun head (4) under the action of the gun body middle sleeve (16). The gun head inner sleeve (3) is connected to the gun body inner sleeve (17) and can slide back and forth along its axis under the action of the gun body inner sleeve (17). When the gun head inner sleeve (3) moves backward, the gun head inner sleeve (3) can act on the double claw (5) to clamp the core rod (141) and move it backward. The thimble sleeve (7) is slidably arranged inside the gun body inner sleeve (17) and the gun head inner sleeve (3). A gun head tail spring (11) is also arranged between the thimble sleeve (7) and the gun body inner sleeve (17). The thimble (8) is slidably arranged inside the thimble sleeve (7). A thimble spring (9) is also arranged between the thimble (8) and the thimble sleeve (7); The double claw (5) is located inside the gun head inner sleeve (3) in front of the thimble (8). The double claw (5) is butted to form a claw hole for the core rod (141) and the thimble (8) to penetrate through. The gun head (4) is provided with a jack for the core rod (141) to pass through. The front end of the gun head (4) is provided with a gun nozzle (41). The front end of the gun head outer sleeve (1) is provided with an outer sleeve nozzle. When riveting the rivet (14), the front end face of the outer sleeve nozzle can act on the head of the nail sleeve (142). The gun nozzle (41) can move forward under the action of the gun head middle sleeve (2) to act on the rear end face of the lock ring (143). The outer sleeve nozzle can cover the outside of the lock ring (143) and the gun nozzle (41).
2. The core-pulling rivet assembly device for aerospace according to claim 1, wherein, The gun head inner sleeve (3) is provided with an inner sleeve inclined surface (301). The double claw (5) is provided with a claw inclined surface (51) adapted to the inner sleeve inclined surface (301). When the gun head inner sleeve (3) moves backward, the inner sleeve inclined surface (301) can act on the claw inclined surface (51) to make the double claw (5) generate a clamping force on the core rod (141) and pull the core rod (141) to move backward. The rear end of the gun head (4) is provided with a gun inclined surface (44). When the double claw (5) moves forward and contacts the gun head (4), the gun inclined surface (44) contacts the claw inclined surface (51) and the double claw (5) generates an opening angle under the elastic force of the gun head tail spring (11), so that the core rod (141) is separated from the double claw (5).
3. The core-pulling rivet assembly device for aerospace according to claim 1, wherein, The middle part of the gun head (4) is also provided with a middle ring convex (42). The outer peripheral surface of the middle ring convex (42) is bent backward to form a ring sleeve structure (43). The gun head middle sleeve (2) can push the gun head (4) forward by acting on the ring sleeve structure (43).
4. The aerospace blind rivet assembly device according to claim 1, characterized in that, The double claw (5) includes a pair of clamping claws and also includes a claw pin (6) penetrating through the double claw (5). The corresponding positions on the clamping claws are provided with pin holes for the claw pin (6) to pass through.
5. The core-pulling rivet assembly device for aerospace according to claim 1, characterized in that, A limiting ring convex is provided on the thimble (8), a limiting shoulder matching the limiting ring convex is provided on the thimble sleeve (7), a thimble sleeve rear seat (10) is provided at the rear end of the thimble sleeve (7), a thimble spring (9) is arranged between the thimble sleeve rear seat (10) and the thimble (8), and a gun head tail spring (11) is arranged between the inner sleeve (17) of the gun body and the thimble sleeve rear seat (10).
6. The core-pulling rivet assembly device for aerospace according to claim 1, wherein The inner sleeve (3) of the gun head is threadedly connected to the inner sleeve (17) of the gun body.
7. The core-pulling rivet assembly device for aerospace according to claim 1, wherein A tail ring groove (1411) is provided on the core rod (141), and an inner ring groove matching the tail ring groove (1411) is provided on the inner wall of the double claw (5).
8. The core-pulling rivet assembly device for aerospace according to claim 1, characterized in that, The outer sleeve (1) of the gun head is connected to the outer sleeve (15) of the gun body through a connecting mechanism. The connecting mechanism includes a connecting seat (13) and a connecting end cover. The connecting seat (13) is arranged on the outer sleeve (15) of the gun body. The connecting seat (13) is provided with an external thread threadedly connected to the connecting end cover. An outer sleeve convex ring (101) is provided on the outer surface of the outer sleeve (1) of the gun head. An outer sleeve hole is provided on the connecting end cover. The outer diameter of the outer sleeve convex ring (101) is greater than the aperture of the outer sleeve hole.
9. The aerospace blind rivet assembly device according to claim 8, characterized in that, A middle sleeve convex ring (201) is provided on the outer surface of the middle sleeve (2) of the gun head. A limiting ring groove for the movement of the middle sleeve convex ring (201) is provided on the connecting seat (13) or between the connecting seat (13) and the outer sleeve (1) of the gun head.
10. An assembly method for a blind rivet used in aerospace, characterized in that, Adopt the aerospace blind rivet assembling device according to any one of claims 1-9, and the specific steps are as follows: 1) Insert the core rod (141) of the rivet (14) into the gun head (4). The rod knurling (1413) on the core rod (141) acts on the nail sleeve (142) through the lock ring (143), and the rivet (14) is loaded into the hole position of the mounting plate (12); 2) The thimble (8) moves backward under the action of the core rod (141) until the rear part of the core rod (141) is inserted between the double claws (5). The front end of the outer sleeve (1) of the gun head acts on the nail sleeve (142). The lock ring (143) of the rivet (14) is covered in the outer sleeve (1) of the gun head. The inner sleeve (3) of the gun head moves backward and acts on the double claws (5), so that the double claws (5) generate a clamping force on the rear part of the core rod (141), and then pull the core rod (141) to move backward. The nail sleeve (142) is always kept in contact with the mounting plate (12) under the action of the outer sleeve (1) of the gun head; 3) The inner sleeve (3) of the gun head continues to pull the core rod (141) to move backward until the end of the stroke. At this time, the neck-breaking groove (1412) of the rivet (14) reaches the outer end face of the nail sleeve (142) and is flush with the mounting surface of the mounting plate (12); 4) The inner sleeve (2) of the gun head starts to move forward, generating a thrust force acting on the gun head (4). The gun head (4) moves forward and pushes the locking ring (143) covered by the outer sleeve (1) of the gun head into the locking area formed between the core rod (141) and the nail sleeve (142). As the gun head (4) moves and the locking ring (143) reaches the position, it stops moving, and then the expansion within the locking area is completed. After the locking ring (143) is deformed, it can closely cooperate with the core rod (141) and the nail sleeve (142); 5) When the locking ring (143) expands to the point where it cannot be deformed, the core rod (141) breaks at the neck-breaking groove (1412), and the process part of the core rod (141) is separated from the working part to complete the riveting of the rivet (14); 6) The inner sleeve (3) of the gun head resets and approaches the gun head (4). The spring at the tail of the gun head (4) releases pressure and pushes the thimble sleeve (7) forward. When the double claws (5) contact the gun head (4), the gun inclined surface (44) of the gun head (4) contacts the claw inclined surface (51) of the double claws (5), and under the elastic force of the gun head tail spring (11), the double claws (5) generate an opening angle, causing the double claws (5) to separate from the core rod (141). The thimble (8) will push the core rod (141) out of the gun head (4) under the action of the thimble spring (9) to complete the material ejection.
Citation Information
Patent Citations
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