Blind rivet assembling device and method for aerospace

Abstract

The invention relates to a self-plugging rivet assembling device and method for aerospace, and belongs to the technical field of rivet fastening. The assembling device comprises a gun head outer sleeve, a gun head middle sleeve, a gun head inner sleeve, a gun head, double claws, an ejector pin and an ejector pin sleeve. The gun head inner sleeve moves backwards to act on the double claws so that the double claws can clamp the core rod to move backwards, the ejector pin sleeve is arranged in the gun body inner sleeve and the gun head inner sleeve in a sliding mode, a gun head tail spring is arranged between the ejector pin sleeve and the gun body inner sleeve, and an ejector pin spring is arranged between the ejector pin and the ejector pin sleeve. When the rivet is riveted, the end face of the outer sleeve nozzle of the gun head outer sleeve can act on the head of the rivet sleeve, the gun nozzle of the gun head can move forwards to act on the rear end face of the locking ring, and the outer sleeve nozzle can wrap the outer side of the locking ring and the outer side of the gun nozzle. The double-acting riveting assembly device is simple in structure and convenient to operate, double-acting riveting assembly of the rivet is achieved, the locking ring is fully filled in the locking area, the problem that the locking performance of the rivet is affected due to deformation of the locking ring outside the locking area in the past is solved, the locking performance of the rivet is improved, and the assembly efficiency of the rivet is improved.

Description

Technical Field

[0001] The invention relates to an assembly device and an assembly method of a blind rivet for aerospace, belonging to the technical field of rivet fastening. Background Art

[0002] Rivets are one of the most in-demand fasteners in the aerospace field. They are mainly used to connect aircraft skin panels, and the single machine usage can exceed millions of pieces. With the development of the country's aerospace field, the application demand for self-locking rivets is increasing, such as reducing wind resistance and preventing loosening. The lightweight and anti-loosening properties of rivet products have become particularly prominent in the flight process.

[0003] As a single-sided connection product structure, self-locking rivets have higher requirements on the self-locking performance of rivets in order to ensure that such products have stronger vibration resistance and anti-loosening capabilities. It is necessary to set a locking structure on the rivet product to improve the self-locking function of the rivet. Therefore, a locking ring is added to the self-locking rivet. Of course, in order to avoid the weight gain caused by the addition of materials, a "rubbing groove" can also be set on the core rod of the rivet. The coordination of the improved rivet sleeve, core rod and locking ring does increase the riveting strength of the rivet, and the self-locking performance is also improved. At the same time, it can also meet the requirements of lightweight rivets and is widely used.

[0004] Although the rivet has a locking ring structure added to meet the requirements of locking performance, the riveting process of the rivet with the locking ring has not been improved. The riveting process adopts a "single-action" design, and the locking ring is passively squeezed into the "locking area" between the core rod and the nail sleeve by pulling the core rod in a single direction. When the core rod is pulled, only part of the locking ring can enter the locking area and deform, and there is still a part that deforms outside the locking area, which will cause the locking ring to be unable to completely fill the locking area, and there is a gap with the "locking area". The gap between the locking ring and the core rod and the nail sleeve makes it unable to fit tightly with the core rod and the nail sleeve, which not only affects the riveting strength of the rivet, but also the self-locking performance of the rivet with the locking ring is also limited. Therefore, an assembly device and assembly method for aerospace shaft core rivets are urgently needed, which can change the movement form of the locking ring when the rivet is riveted, so that the locking ring can actively enter the locking area, and the riveted locking ring can cooperate closely with the core rod and the nail sleeve, thereby compensating for the adverse effects of passive squeezing and loose combination. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides an assembly device and an assembly method for aerospace blind rivets.

[0006] The technical solution of the present invention to solve the above technical problems is as follows: 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 lock ring; comprising a gun head outer sleeve, a gun head middle sleeve arranged in the gun head outer sleeve, a gun head, a double claw, an ejector pin and an ejector pin sleeve;

[0007] The gun head outer sleeve is arranged on the gun body outer sleeve, 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 with the gun body inner sleeve, and can slide forward and backward along its axial direction under the action of the gun body inner sleeve, when the gun head inner sleeve moves backward, the gun head inner sleeve can act on the double claws to clamp the core rod and move backward, the ejector sleeve is slidably arranged in the gun body inner sleeve and the gun head inner sleeve, a gun head tail spring is further arranged between the ejector sleeve and the gun body inner sleeve, the ejector is slidably arranged in the ejector sleeve, and an ejector spring is further arranged 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 pin, and the double claws are connected to form a claw hole for the core rod and the ejector pin 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 to act on the rear end surface of the locking ring under the action of the gun head inner sleeve, 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 linkage movement mode to assemble the rivet, that is, the two actions of pulling in and pushing out are adopted to complete the one-time assembly and forming of the core-pulling rivet, and the locking ring is prevented from being deformed by the method of covering the locking ring with the gun head jacket, so that the locking ring can avoid non-functional deformation during the deformation process, so that it can smoothly enter the locking area between the nail sleeve and the core rod, and perform functional 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 from applying passive extrusion to the locking ring, so that the locking ring produces non-functional deformation before reaching the locking area, further improves the active movement trend of the locking ring, so that the locking ring can be uniformly 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 enables the locking ring to be fully filled in the locking area of ​​the rivet product under double-action riveting assembly, thereby solving the problem of deformation of the locking ring outside the locking area caused by previous single-action riveting that affects the locking performance of the rivet. 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] Furthermore, an inner sleeve bevel is provided in the inner sleeve of the gun head, and a claw bevel matched with the inner sleeve bevel is provided on the double claws. When the inner sleeve of the gun head moves backward, the inner sleeve bevel can act on the claw bevel, so that the double claws generate a clamping force on the core rod to pull the core rod to move backward; a gun bevel is provided at the rear end of the gun head. When the double claws move forward and contact the gun head, the gun bevel contacts the claw bevel and the double claws generate an opening angle under the elastic force of the gun head tail spring, so that the core rod is separated from the double claws.

[0012] The beneficial effect of adopting the above further scheme is that the inner sleeve bevel can act on the claw bevel when the inner sleeve of the gun head moves backward, and the two cooperate with the double claws to generate a force to clamp the core rod and pull the core rod backward; the problem of the core rod of the blind rivet being pulled backward is solved; after the blind rivet is assembled, the broken core rod needs to be ejected, the inner sleeve of the gun head is reset, and the tail spring of the gun head releases the pressure to push the ejector sleeve forward. When the double claws move to contact the gun head, the front ends of the double claws can be opened through the cooperation of the gun bevel and the claw bevel, so that the core rod can be separated from the double claws, and the core rod can be ejected out of the gun head under the action of the ejector to complete the material return.

[0013] Furthermore, a central annular convexity is provided in the middle of the gun head, and the outer circumference of the central annular convexity is bent backward to form an annular structure, and the gun head middle sleeve can push the gun head forward by acting on the annular structure.

[0014] The beneficial effect of adopting the above further scheme 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 push the locking ring covered by the gun head outer sleeve smoothly into the locking area of ​​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 bulge 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 gun head forward by acting on the ring sleeve structure when moving forward.

[0015] Furthermore, the double claws include a pair of clamping claws, and also include a claw pin that passes through the double claws, and the clamping claws are correspondingly provided with a pin hole for the claw pin to pass through.

[0016] The beneficial effect of adopting the above further scheme is that the two claws are inside the inner sleeve of the gun head. If there is no claw pin between the two, the jaws may be misaligned front and back. In order to avoid this situation, a claw pin is added between a pair of jaws, and the claw pin radially inserted into the jaws ensures the consistency of the pair of jaws in the axial direction.

[0017] Furthermore, the ejector pin is provided with a limiting ring protrusion, the ejector sleeve is provided with a limiting shoulder matching with the limiting ring protrusion, the rear end of the ejector sleeve is provided with a needle sleeve rear seat, the ejector spring is provided between the ejector sleeve seat and the ejector pin, and the gun head tail spring is provided between the gun body inner sleeve and the needle sleeve rear seat.

[0018] The beneficial effect of adopting the above further scheme is that the ejector pin moves forward under the action of the ejector pin spring to eject the broken core rod, and a limiting ring convex with a relatively large outer diameter is provided on the ejector pin, and the ring convex is limited by the limiting shoulder to prevent the ejector pin from detaching from the ejector pin sleeve, which means that the ejector pin must be assembled from the tail of the ejector pin sleeve, so a needle sleeve rear seat is provided at the tail of the ejector pin sleeve, so that the ejector pin spring and the gun head tail spring acting on the ejector pin sleeve can both act on the needle sleeve rear seat.

[0019] Furthermore, the inner sleeve of the gun head is threadedly connected to the inner sleeve of the gun body.

[0020] The beneficial effect of adopting the above further solution is that the threaded connection is convenient, which realizes the connection between the gun body inner sleeve and the gun head inner sleeve, and prepares for the gun body inner sleeve to drive the gun head inner sleeve to move forward and backward.

[0021] Furthermore, the core rod is provided with a tail ring groove, and the inner walls of the double claws are provided with an inner ring groove matched with the tail ring groove.

[0022] The beneficial effect of adopting the above further solution 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 claws on the core rod better.

[0023] Furthermore, the gun head jacket is connected to the gun body jacket via a connecting mechanism, the connecting mechanism comprising a connecting seat and a connecting end cover, the connecting seat is arranged on the gun body jacket, the connecting seat is provided with an external thread threadedly connected to the connecting end cover, the outer surface of the gun head jacket is provided with a jacket convex ring, the connecting end cover is provided with a jacket hole, and the outer diameter of the jacket convex ring is larger than the aperture of the jacket hole.

[0024] The beneficial effect of adopting the above further scheme is that the connecting end cover is sleeved on the gun head jacket from the head end, the cover body end face of the connecting end cover acts on the jacket convex ring, and the inner wall of the cover body is threadedly connected to the connecting seat to realize the connection between the gun head and the gun body.

[0025] Furthermore, a middle sleeve convex ring is provided on the outer surface of the gun head middle sleeve, 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 effect of adopting the above-mentioned further scheme is that the cooperation between the middle sleeve convex ring and the limiting ring groove can limit the range of movement of the middle sleeve of the gun head, and limit the forward position and backward position of the middle sleeve of the gun head, so as to ensure that the forward movement of the middle sleeve of the gun head 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 outer sleeve of the gun head into the locking area formed between the core rod and the nail sleeve, and can stop the movement of the locking ring after reaching the position, thereby completing the expansion of the locking ring in the locking area, and the locking ring can be tightly matched with the core rod and the nail sleeve after deformation.

[0027] The present invention also discloses an assembly method of an aerospace blind rivet, which uses the aerospace blind rivet assembly device as described above, 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 installed into the hole of the mounting plate;

[0029] 2) The ejector moves backward under the action of the core rod until the rear of the core rod is inserted between the two claws. The front end of the gun head jacket acts on the nail sleeve, and the lock ring of the rivet is covered in the gun head jacket. The gun head inner sleeve moves backward to act on the two claws, so that the two claws generate a clamping force on the rear of the core rod, thereby pulling the core rod backward. Under the action of the gun head jacket, the nail sleeve always keeps in contact with the mounting plate;

[0030] 3) The inner sleeve of the gun head continues to pull the core rod backward until the end of the stroke, at which time the broken neck groove of the rivet reaches the outer end surface of the rivet sleeve and is flush with the mounting surface of the mounting plate;

[0031] 4) The gun head sleeve starts to move forward and generates thrust on the gun head. The gun head moves forward and pushes the locking ring covered by the gun head 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 it is in place, thereby completing the expansion in the locking area. After the locking ring is deformed, it can fit tightly with the core rod and the nail sleeve;

[0032] 5) When the lock ring expands to the point where it cannot be deformed, the core rod breaks from the broken neck 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 is reset close to the gun head, and the spring at the tail of the gun head releases the pressure to push the ejector sleeve forward. When the double claws contact the gun head, the gun bevel of the gun head contacts the claw bevel of the double claws and the double claws produce an opening angle under the elastic force of the tail spring of the gun head, so that the double claws are separated from the core rod. The ejector will push the core rod out of the gun head under the action of the ejector spring to complete the material removal.

[0034] The beneficial effects of the present invention are as follows: the present invention realizes the reliability of single-sided connection of self-locking blind rivet products by converting the riveting assembly device from "single action" to "double action", and improves its own locking performance. The present invention realizes the provision of a "double action" assembly device for the installation of rivet products, improves the riveting effect of self-locking rivets, ensures that the rivet "locking ring" and the "locking area" are tightly combined, and improves the vibration resistance and anti-loosening ability of the rivet. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a structural schematic diagram of the blind rivet assembly device of the present invention;

[0036] Figure 2 It is a structural schematic diagram of the gun head of the present invention;

[0037] Figure 3 It is a structural schematic diagram of a blind rivet;

[0038] Figure 4 It is a schematic diagram of the structure of the present invention in the original state before riveting;

[0039] Figure 5 It is a structural schematic diagram of the present invention in the state of riveting and pulling in the core rod;

[0040] Figure 6 It is a structural schematic diagram of the present invention in a riveting and pulling-in completion state;

[0041] Figure 7 It is a structural schematic diagram of the present invention in a riveting completion state;

[0042] Figure 8 It is a structural schematic diagram of the material return state of the present invention;

[0043] Fig. 9 It is a structural schematic diagram of the riveting process of a blind rivet;

[0044] In the figure, 1, gun head outer sleeve; 101, outer sleeve convex ring; 2, gun head middle sleeve; 201, middle sleeve convex ring; 3, gun head inner sleeve; 301, inner sleeve inclined surface; 4, gun head; 41, gun nozzle; 42, middle ring convex; 43, ring sleeve structure; 44, gun inclined surface; 5, double claws; 51, claw inclined surface; 6, claw pin; 7, ejector sleeve; 8, ejector; 9, ejector spring; 10, needle sleeve rear seat; 11, gun head tail spring; 12, mounting plate; 13, connecting seat; 14, rivet; 141, core rod; 1411, tail ring groove; 1412, broken neck groove; 1413, rod knurling; 142, nail sleeve; 143, locking ring; 144, locking area; 15, gun body outer sleeve; 16, gun body middle sleeve; 17, gun body inner sleeve. DETAILED DESCRIPTION

[0045] The principles and features of the present invention are described below in conjunction with examples. The examples are only used to explain the present invention and are not used to limit the scope of the present invention.

[0046] like Figure 1-Figure 9 As shown, a blind rivet assembly device for aerospace, the rivet 14 includes a core rod 141, a nail sleeve 142 and a lock ring 143 sleeved on the outside of the core rod 141; includes a gun head outer sleeve 1, a gun head middle sleeve 2 arranged in the gun head outer sleeve 1, a gun head inner sleeve 3, a gun head 4, a double claw 5, an ejector pin 8 and an ejector pin sleeve 7;

[0047] The gun head outer sleeve 1 is arranged on the gun body outer sleeve 15, the gun head middle sleeve 2 can move toward the gun head 4 under the action of the gun body middle sleeve 16, the gun head inner sleeve 3 is connected with the gun body inner sleeve 17, and can slide forward and backward along its axial direction 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 claws 5 so that it can clamp the core rod 141 and move backward, the ejector 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 further arranged between the ejector sleeve 7 and the gun body inner sleeve 17, the ejector 8 is slidably arranged in the ejector sleeve 7, and an ejector spring 9 is further arranged between the ejector 8 and the ejector sleeve 7;

[0048] The double claws 5 are located in the gun head inner sleeve 3 in front of the ejector 8, and the double claws 5 are connected to form a claw hole for the core rod 141 and the ejector 8 to pass through; the gun head 4 is provided with a socket for the core rod 141 to pass through, and 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 surface of the outer sleeve nozzle can act on the head of the nail sleeve 142, and the gun nozzle 41 can move forward to act on the rear end surface of the locking ring 143 under the action of the gun head middle sleeve 2, and the outer sleeve nozzle can cover the outer side of the locking ring 143 and the gun nozzle 41.

[0049] An inner sleeve bevel 301 is provided in the gun head inner sleeve 3, and a claw bevel 51 matched with the inner sleeve bevel 301 is provided on the double claws 5. When the gun head inner sleeve 3 moves backward, the inner sleeve bevel 301 can act on the claw bevel 51, so that the double claws 5 generate a clamping force on the core rod 141 to pull the core rod 141 to move backward; a gun bevel 44 is provided at the rear end of the gun head 4. When the double claws 5 move forward and contact the gun head 4, the gun bevel 44 contacts the claw bevel 51 and the double claws 5 generate 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 claws 5. The inner sleeve bevel 301 can act on the claw bevel 51 when the gun head inner sleeve 3 moves backward, and the two cooperate with the double claws 5 to generate a force to clamp the core rod 141 to pull the core rod 141 backward; the problem of the core rod 141 of the blind rivet 14 is solved; after the blind rivet 14 is assembled, the broken core rod 141 needs to be ejected, the gun head inner sleeve 3 is reset, and the gun head tail spring 11 releases the pressure to push the ejector sleeve 7 forward. When the double claws 5 move to contact with the gun head 4, the front end of the double claws 5 can be opened through the cooperation of the gun bevel 44 and the claw bevel 51, 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 ejector 8 to complete the material return.

[0050] The middle part of the gun head 4 is also provided with a middle annular protrusion 42, and the outer circumference of the middle annular protrusion 42 is bent backward to form an annular structure 43, and the gun head middle sleeve 2 can push the gun head 4 forward by acting on the annular structure 43. When the core rod 141 moves backward to the end of the stroke, the gun head middle sleeve 2 starts to move forward to generate thrust acting on the gun head 4, so that the gun head 4 moves forward to smoothly push the lock ring 143 covered 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 gun head middle sleeve 2 to act on the gun head 4, the middle annular protrusion 42 and the annular structure 43 are designed on the outer circumference of the gun head 4, so that the gun head middle sleeve 2 can drive the gun head 4 forward by acting on the annular structure 43 when moving forward.

[0051] The double claws 5 include a pair of clamping jaws, and also include a claw pin 6 that penetrates the double claws 5. The clamping jaws are provided with a corresponding pin hole for the claw pin 6 to pass through. The double claws 5 are located inside the gun head inner sleeve 3. If there is no claw pin 6 between the two, the clamping jaws may be misaligned front and back. In order to avoid this situation, a claw pin 6 is added between the pair of clamping jaws, and the claw pin 6 radially inserted into the clamping jaws ensures the consistency of the pair of clamping jaws in the axial direction.

[0052] The ejector pin 8 is provided with a limiting annular protrusion, the ejector sleeve 7 is provided with a limiting shoulder matched with the limiting annular protrusion, the rear end of the ejector sleeve 7 is provided with a needle sleeve rear seat 10, the ejector spring 9 is provided between the ejector sleeve 7 seat and the ejector pin 8, and the gun head tail spring 11 is provided between the gun body inner sleeve 17 and the needle sleeve rear seat 10. The ejector pin 8 moves forward under the action of the ejector spring 9 to eject the broken core rod 141. The ejector pin 8 is provided with a limiting annular protrusion with a relatively large outer diameter, and the limiting shoulder is used to limit the ring protrusion absorbed to prevent the ejector pin 8 from being separated from the ejector sleeve 7, which means that the ejector pin 8 must be assembled from the rear end of the ejector sleeve 7, so the needle sleeve rear seat 10 is provided at the rear end of the ejector sleeve 7, so that the ejector spring 9 and the gun head tail spring 11 acting on the ejector sleeve 7 can both act on the needle sleeve rear seat 10.

[0053] The gun head inner sleeve 3 is threadedly connected to the gun body inner sleeve 17. The threaded connection is convenient, and the connection between the gun body inner sleeve 17 and the gun head inner sleeve 3 is realized, and the gun body inner sleeve 17 is ready for the gun head inner sleeve 3 to be driven by the gun body inner sleeve 17 to move forward and backward.

[0054] The core rod 141 is provided with a tail ring groove 1411, and the inner wall of the double claws 5 is provided with an inner ring groove matching the tail ring groove 1411. Compared with a smooth surface, the cooperation between the inner ring groove and the tail ring groove 1411 makes the double claws 5 have a better clamping effect on the core rod 141.

[0055] The gun head jacket 1 is connected to the gun body jacket 15 through a connecting mechanism, and the connecting mechanism includes a connecting seat 13 and a connecting end cover. The connecting seat 13 is arranged on the gun body jacket 15, and the connecting seat 13 is provided with an external thread that is threadedly connected to the connecting end cover. A jacket convex ring 101 is provided on the outer surface of the gun head jacket 1, and a jacket hole is provided on the connecting end cover. The outer diameter of the jacket convex ring 101 is larger than the aperture of the jacket hole. The connecting end cover is sleeved on the gun head jacket 1 from the head end, and the cover body end face of the connecting end cover acts on the jacket convex ring 101. The inner wall of the cover body is threadedly connected to the connecting seat 13 to realize the connection between the gun head 4 and the gun body.

[0056] A middle sleeve convex ring 201 is provided on the outer surface of the gun head middle sleeve 2, and a limiting ring groove for the middle sleeve convex ring 201 to move 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 limiting ring groove can limit the range of movement of the gun head middle sleeve 2, and limit the forward position and backward position of the gun head middle sleeve 2, so as to ensure that the forward movement of the gun head middle sleeve 2 can act on the gun head 4 so that the front end of the gun head 4 can act on the locking ring 143 to smoothly push the locking ring 143 covered in the gun head outer sleeve 1 into the locking area formed between the core rod 141 and the nail sleeve 142, and can make the locking ring 143 stop moving after reaching the position, so as to complete the expansion of the locking ring 143 in the locking area, and the locking ring 143 can be tightly matched with the core rod 141 and the nail sleeve 142 after deformation.

[0057] like Figure 4-Figure 9 As shown, the present invention also discloses an assembly method of an aerospace blind rivet, using the aerospace blind rivet assembly device as described above, and the specific steps are as follows:

[0058] 1) Insert the core rod 141 of the rivet 14 into the gun head 4, and the rod knurling 1413 of the core rod 141 acts on the nail sleeve 142 through the locking ring 143, and install the rivet 14 into the hole 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 jacket 1 acts on the nail sleeve 142, the lock ring 143 of the rivet 14 is covered in the gun head jacket 1, and the gun head inner sleeve 3 moves backward to act on the double claws 5, so that the double claws 5 generate a clamping force on the rear part of the core rod 141, thereby pulling the core rod 141 to move backward, and the nail sleeve 142 is always kept in contact with the mounting plate 12 under the action of the gun head jacket 1;

[0060] 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 which time the broken neck groove 1412 of the rivet 14 reaches the outer end surface 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 thrust on the gun head 4. The gun head 4 moves forward and pushes the locking 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, the locking ring 143 stops moving after it is in place, thereby completing the expansion in the locking area. After the locking ring 143 is deformed, it can fit tightly with the core rod 141 and the nail sleeve 142;

[0062] 5) When the lock ring 143 expands to the point where it cannot be deformed, the core rod 141 breaks at the breaking neck groove 1412, and the process part and the working part of the core rod 141 are separated to complete the riveting process of the rivet 14;

[0063] 6) The inner sleeve 3 of the gun head is reset to be close to the gun head 4, and the spring at the tail of the gun head 4 releases the pressure to push the ejector sleeve 7 to move forward. When the double claws 5 contact the gun head 4, the gun bevel 44 of the gun head 4 contacts the claw bevel 51 of the double claws 5 and the double claws 5 produce an opening angle under the elastic force of the gun head tail spring 11, so that the double claws 5 are separated from the core rod 141, and the ejector 8 will push the core rod 141 out of the gun head 4 under the action of the ejector spring 9 to complete the material removal.

[0064] The outer diameter of the rod knurling is larger than the outer diameter of the core rod at its installation position and smaller than the aperture of the gun head.

[0065] The axial core rivet assembly device can be suitable for a pneumatic riveting gun. The pulling-in and pushing-out actions of the gun head 4 are ensured by the movement of the rivet gun. The assembly of the self-locking core-pulling rivet 14 is completed by a complete stroke of the rivet gun: first, the rivet 14 is installed into the gun head 4, and the rivet 14 is installed into the hole of the mounting plate 12. The rod knurling 1413 on the core rod 141 acts on the locking ring 143, and then indirectly acts on the nail sleeve 142. The rivet is installed into 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. Figure 4 As shown, at this time, the ejector pin 8 will move backward under the action of the core rod 141 until the core rod 141 reaches the position of the double claws 5. At this time, the gun head 4 is slightly sunken in the gun head jacket 1, so that the lock ring 143 is covered in the gun head jacket 1; when the riveting starts, the gun head inner sleeve 3 moves backward, and then the inner inclined surface of the gun head inner sleeve 3 contacts the claw inclined surface 51 of the double claws 5, so that the double claws 5 generate a clamping force on the ring groove 1411 at the tail of the core rod 141, thereby pulling the core rod 141 to move backward. At this time, the nail sleeve 142 is always kept in contact with the mounting plate 12 under the reaction force of the gun head jacket 1, as shown in FIG. Figure 5 Next, the double claws 5 continue to generate tension to drive the core rod 141 to move until the end of the stroke is reached, at which time the broken neck groove 1412 of the rivet 14 reaches the end surface of the nail sleeve 142 and is flush with the mounting surface of the mounting plate 12, as shown. Figure 6 As shown; then the gun head sleeve 2 starts to move forward to generate thrust acting on the gun head 4, and the gun head 4 continues to move forward to smoothly push the lock ring 143 covered by the gun head sleeve 1 into the locking area formed between the core rod 141 and the nail sleeve 142. As the gun head 4 moves, the lock ring 143 stops moving after reaching the position, and then the lock ring 143 expands in the locking area cavity, so that the lock ring 143 is deformed and tightly matched with the core rod 141 and the nail sleeve 142, as shown in FIG. Figure 7As shown; when the lock ring 143 expands to the point where it cannot be deformed, 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 to move forward. When the double claws 5 contact the gun head 4, the gun bevel 44 on the inner side of the gun head 4 contacts the claw bevel 51 of the double claws 5, and under the action of elastic force, an angle is generated to cause the inner groove of the double claws 5 to separate 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, and realizes that when the product is riveted in a "double-action" manner, the locking ring 143 is fully filled in the locking area, which solves the deformation of the locking ring 143 outside the locking area caused by the previous "single-action" riveting, improves the locking performance, and at the same time, the riveting and material withdrawal are completed in one time to improve the riveting efficiency. The riveting effect of the self-locking core-pulling rivet 14 is improved, ensuring that the "locking ring" and "locking area" of the rivet are tightly combined, and the vibration resistance and anti-loosening ability of the rivet are improved.

[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 blind rivet assembly device for aerospace, the rivet (14) comprising a core rod (141), a rod knurling (1413) arranged on the core rod (141), a rivet sleeve (142) sleeved on the outside of the core rod (141) and a locking ring (143); characterized in that: It comprises a gun head outer sleeve (1), a gun head middle sleeve (2) arranged in the gun head outer sleeve (1), a gun head inner sleeve (3), a gun head (4), two claws (5), an ejector pin (8) and an ejector pin sleeve (7); The gun head outer sleeve (1) is arranged on the gun body outer sleeve (15); the gun head middle sleeve (2) can move toward 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 forward and backward along its axial direction 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 claws (5) to enable the clamping core rod (141) to move backward; the ejector sleeve (7) is slidably arranged in the gun body inner sleeve (17) and the gun head inner sleeve (3); a gun head tail spring (11) is further arranged between the ejector sleeve (7) and the gun body inner sleeve (17); the ejector (8) is slidably arranged in the ejector sleeve (7); and an ejector spring (9) is further arranged between the ejector (8) and the ejector sleeve (7); The double claws (5) are located in the gun head inner sleeve (3) in front of the ejector pin (8), and the double claws (5) are connected to form a claw hole for the core rod (141) and the ejector pin (8) to pass through; the gun head (4) is provided with a socket for the core rod (141) to pass through, the front end of the gun head (4) is provided with a gun mouth (41), and the front end of the gun head outer sleeve (1) is provided with an outer sleeve mouth. When the rivet (14) is riveted, the front end surface of the outer sleeve mouth can act on the head of the nail sleeve (142), and the gun mouth (41) can move forward to act on the rear end surface of the locking ring (143) under the action of the gun head middle sleeve (2), and the outer sleeve mouth can cover the outer side of the locking ring (143) and the gun mouth (41).

2. The aerospace blind rivet assembly device according to claim 1, characterized in that: The gun head inner sleeve (3) 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 gun head inner sleeve (3) 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) to move 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 the double claws (5) generate an opening angle under the elastic force of the gun head tail spring (11), so that the core rod (141) and the double claws (5) are separated.

3. The blind rivet assembly device for aerospace according to claim 1, characterized in that: The middle part of the gun head (4) is also provided with a middle annular protrusion (42), the outer circumference of which is bent backward to form an annular structure (43), and the gun head middle sleeve (2) can push the gun head (4) forward by acting on the annular structure (43).

4. The blind rivet assembly device for aerospace according to claim 1, characterized in that: The double claws (5) include a pair of clamping claws and a claw pin (6) passing through the double claws (5). The clamping claws are provided with corresponding pin holes for the claw pin (6) to pass through.

5. The aerospace blind rivet assembly device according to claim 1, characterized in that: The ejector pin (8) is provided with a limiting ring protrusion, the ejector pin sleeve (7) is provided with a limiting shoulder matched with the limiting ring protrusion, the rear end of the ejector pin sleeve (7) is provided with a needle sleeve rear seat (10), the ejector pin spring (9) is arranged between the ejector pin sleeve (7) seat and the ejector pin (8), and the gun head tail spring (11) is arranged between the gun body inner sleeve (17) and the needle sleeve rear seat (10).

6. The aerospace blind rivet assembly device according to claim 1, characterized in that: The gun head inner sleeve (3) is threadedly connected to the gun body inner sleeve (17).

7. The blind rivet assembly device for aerospace according to claim 1, characterized in that: The core rod (141) is provided with a tail ring groove (1411), and the inner wall of the double claws (5) is provided with an inner ring groove matching the tail ring groove (1411).

8. The blind rivet assembly device for aerospace according to claim 1, characterized in that: The gun head jacket (1) is connected to the gun body jacket (15) via a connecting mechanism, wherein the connecting mechanism comprises a connecting seat (13) and a connecting end cover, wherein the connecting seat (13) is arranged on the gun body jacket (15), and the connecting seat (13) is provided with an external thread threadedly connected to the connecting end cover, and an outer jacket convex ring (101) is provided on the outer surface of the gun head jacket (1), and an outer jacket hole is provided on the connecting end cover, and the outer diameter of the outer jacket convex ring (101) is larger than the hole diameter of the outer jacket hole.

9. The blind rivet assembly device for aerospace according to claim 8, characterized in that: A middle sleeve convex ring (201) is provided on the outer surface of the gun head middle sleeve (2), and a limiting ring groove for the middle sleeve convex ring (201) to move is provided on the connecting seat (13) or between the connecting seat (13) and the gun head outer sleeve (1).

10. A method for assembling blind rivets for aerospace, characterized in that: The aerospace blind rivet assembly device according to any one of claims 1 to 9 is used, and the specific steps are as follows: 1) inserting 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 locking ring (143), and the rivet (14) is installed into the hole of the mounting plate (12); 2) The ejector pin (8) moves backward under the action of the core rod (141) until the rear of the core rod (141) is inserted between the two 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 covered in the gun head outer sleeve (1), and the gun head inner sleeve (3) moves backward to act on the two claws (5), so that the two claws (5) generate a clamping force on the rear of the core rod (141), thereby pulling the core rod (141) to move backward, and the nail sleeve (142) is always kept in contact with the mounting plate (12) under the action of the gun head outer sleeve (1); 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 which time the neck groove (1412) of the rivet (14) reaches the outer end surface of the rivet sleeve (142) and is flush with the mounting surface of the mounting plate (12); 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) 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, the locking ring (143) stops moving after it is in place, thereby completing the expansion in the locking area. After the locking ring (143) is deformed, it can be tightly matched with the core rod (141) and the nail sleeve (142); 5) When the lock ring (143) expands to the point where it cannot be deformed, the core rod (141) breaks at the breaking neck groove (1412), and the process part and the working part of the core rod (141) are separated to complete the riveting of the rivet (14); 6) The inner sleeve (3) of the gun head is reset and close to the gun head (4), and the spring at the tail of the gun head (4) releases the pressure to push the ejector sleeve (7) forward. When the double claws (5) contact the gun head (4), the gun bevel (44) of the gun head (4) contacts the claw bevel (51) of the double claws (5) and the double claws (5) generate an opening angle under the elastic force of the tail spring (11) of the gun head, so that the double claws (5) are separated from the core rod (141). The ejector (8) will push the core rod (141) out of the gun head (4) under the action of the ejector spring (9) to complete the material removal.

Images