Secondary riveting die structure

Abstract

The invention belongs to the technical field of pressing rivet dies, and discloses a secondary pressing rivet die structure which comprises a die shell. The fixed cylinder is arranged in the mold shell; the buffering assembly is arranged in the mold shell and located on the outer side of the fixing cylinder; according to the technical scheme, by arranging the mold core mounting assembly, the first limiting assembly and the unlocking assembly, when mold cores of different models and sizes are mounted on the inner sides of the corresponding mold core mounting assemblies, the mold cores can be mounted on the inner sides of the mold core mounting assemblies, the mold cores can be mounted on the mold core mounting assemblies, and the mold cores can be mounted on the mold core mounting assemblies; the mold core mounting assemblies can be directly screwed in and mounted along the threads on the inner sides of the mold core mounting assemblies, or the mold core mounting assemblies larger than the inner sides can extrude and push the unlocking assemblies to relieve the fixing effect on the mold core mounting assemblies, so that mold cores of corresponding sizes and models are mounted on the inner sides through the internal threads of part of the mold core mounting assemblies; and finally, the purpose of replacing mold cores under the condition of pressing rivets of different models can be achieved, high development cost is avoided, and machining efficiency is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of press riveting molds, and particularly relates to a secondary press riveting mold structure. BACKGROUND

[0002] Press riveting refers to plastic deformation of a machine body material under external pressure in a riveting process, and a corresponding preformed groove is formed, secondary press riveting refers to a mode of reliably connecting two parts by using a cylinder to press a mold to extrude a riveting screw into a preformed groove specially arranged in a nut structure, and press riveting usually needs to use a press riveting machine or a pneumatic tool to apply pressure, so that the rivet passes through the holes of two pieces of sheet metal or materials and bends the end thereof, so as to tightly connect the materials together.

[0003] However, the mold core in the secondary press riveting mold can only perform press riveting of one type and size, and when press riveting of other types is needed, the corresponding mold needs to be replaced, which greatly increases the development cost and efficiency, and therefore needs to be improved. SUMMARY

[0004] To solve the problems in the background, the application provides a secondary press riveting mold structure, which has the advantages of reducing development cost and efficiency.

[0005] To achieve the above-mentioned purpose, the application provides the following technical scheme: a secondary press riveting mold structure, comprising a mold shell, a fixed cylinder arranged in the interior of the mold shell, a buffer assembly arranged in the interior of the mold shell and located outside the fixed cylinder, a movable block movably installed in the interior of the fixed cylinder, a mold core installation assembly comprising an installation sleeve movably installed at the bottom of the movable block, and the outer end of the installation sleeve is fixedly connected with the inner wall of the fixed cylinder, two sides of the movable block are provided with sliding grooves located in the top of the installation sleeve, the top of the inner end of the installation sleeve is provided with sliding blocks located in the inner wall of the sliding grooves, the installation sleeves are provided with a first limiting assembly therebetween, and the installation sleeves are provided with an unlocking assembly located on one side of the first limiting assembly.

[0006] Preferably, one end of the mold shell is provided with a mounting stud, and the movable block is elastically connected with the inner cavity of the fixed cylinder through a third buffer spring.

[0007] Preferably, the buffer assembly comprises a buffer sleeve, a first buffer spring and a second buffer spring.

[0008] The buffer sleeve is movably installed between the mold shell and the fixed cylinder, one end of the buffer sleeve is elastically connected with the inner wall of the mold shell through the first buffer spring, and the other end of the buffer sleeve is elastically connected with the surface of the fixed cylinder through the second buffer spring.

[0009] Preferably, the first limiting component includes a first limiting groove and a first limiting block;

[0010] The first limiting groove is formed on the outside of the mounting sleeve, and the first limiting block is set on the inside of the mounting sleeve and located inside the first limiting groove.

[0011] Preferably, the unlocking component includes a push bar, a fixing block, a limiting rod, and a first connecting spring;

[0012] The push bar is movably installed inside the mounting sleeve, the fixing block is movably installed inside the mounting sleeve and located on one side of the push bar, the limiting rod is disposed inside the mounting sleeve and is slidably connected to one end of the fixing block, and the fixing block is elastically connected to the inside of the mounting sleeve through a first connecting spring.

[0013] Preferably, the mounting sleeve is provided with a second limiting component located outside the other end of the push bar, the second limiting component including a second limiting groove and a second limiting block;

[0014] The second limiting groove is formed inside the mounting sleeve and is located on the outer side of the other end of the push bar. The second limiting block is fixedly installed on the outer side of the other end of the push bar and is located inside the second limiting groove.

[0015] Preferably, a movable plate located on one side of the mounting sleeve is movably mounted inside the movable block, and the movable plate is elastically connected to the inside of the movable block via a return spring.

[0016] Preferably, a linkage mechanism is provided in the middle of one side of the movable block, and the linkage mechanism includes a linkage push plate, a sliding rod, a second connecting spring, a transmission arm, and a fixing component;

[0017] The linkage push plate is movably installed in the middle of the inner cavity of the movable block. The sliding rod is fixedly installed in the inner cavity of the movable block and is located above the linkage push plate. The fixing component is slidably connected to the surface of the sliding rod, and the outer end of the fixing component extends to the top outer end of the movable block. The inner end of the fixing component is elastically connected to the inner wall of the movable block through a second connecting spring. The transmission arm is hinged between the two sides of the top of the linkage push plate and the inner end of the fixing component.

[0018] Preferably, the fixing assembly includes a movable rod, a telescopic rod, a third connecting spring, and a locking block;

[0019] The movable rod is slidably connected to the surface of the sliding rod, and the telescopic rod is slidably connected to the inner wall of the outer end of the movable rod. The inner end of the telescopic rod is elastically connected to the inner wall of the movable rod through a third connecting spring. The clamping block is set at the inner end of the telescopic rod, and the size of the clamping block is exactly the same as the inner groove size of the slider.

[0020] Preferably, the movable block is provided with a pneumatic assembly located at the top of the movable rod. The pneumatic assembly includes a first pneumatic cylinder, a first pneumatic piston rod, a second pneumatic cylinder, a second pneumatic piston rod, and a venting groove.

[0021] The first pneumatic cylinder is fixedly installed inside the movable block and is located at the top of the clamping block. The first pneumatic piston rod is movably installed in the inner cavity of the first pneumatic cylinder. The second pneumatic cylinder is fixedly installed inside the movable block and is located above the middle of the movable rod. The second pneumatic piston rod is movably installed in the inner cavity of the second pneumatic cylinder. The second pneumatic cylinder is connected to the first pneumatic cylinder through a venting groove.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] The above technical solution, by setting up a mold core mounting component, a first limiting component, and an unlocking component, allows mold cores of different models and sizes to be installed inside the corresponding mold core mounting component. They can be directly screwed in along the inner thread of the mold core mounting component. Alternatively, if the mold core mounting component is larger than the inner one, it will squeeze and push the unlocking component to release the fixing effect between the mold core mounting components. This allows the inner thread of part of the mold core mounting component to install the mold core of the corresponding size and model inside. Ultimately, this can meet the purpose of changing mold cores under different riveting conditions, avoiding high development costs and improving processing efficiency.

[0024] This invention, by setting up a linkage push plate and a fixing component, when the mold core rotates into the inner side of the corresponding mold core mounting component and pushes the inner part of the mold core mounting component to retract into the movable block, it will simultaneously push the linkage push plate to move upward. This will cause the transmission arm to deflect and push the two fixing components to move in opposite directions along the surface of the sliding rod, so that the outer end of the fixing component can smoothly disengage from the outer side of the movable block. This allows the slider to move upward, first squeezing the outer end of the fixing component to retract and then releasing it, so that the outer end of the fixing component can smoothly insert into the inner end of the slider. This can stably fix part of the mold core mounting component and prevent the subsequent return spring force from pushing the retracted part of the mold core mounting component to revert, which would affect the fixing effect of the mold core.

[0025] This invention, by setting up a pneumatic component, causes the output end of the outer part of the pneumatic component to retract into the inner part when the mold core mounting component is pushed upward by the screwed-in mold core. Then, the gas inside the outer part is introduced into the inner part, thereby pushing the output end of the inner part of the pneumatic component downward into the inner cavity of the fixing component. This stabilizes the entire fixing component and greatly improves the fixing effect of the fixing component on the upward-pushed part of the mold core mounting component. Attached Figure Description

[0026] Figure 1This is a schematic diagram of the structure of the present invention;

[0027] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0028] Figure 3 This is a partial cross-sectional view of the fixing cylinder of the present invention;

[0029] Figure 4 for Figure 3 A magnified schematic diagram of the partial structure at point A in the middle;

[0030] Figure 5 for Figure 3 A magnified schematic diagram of the local structure at point B;

[0031] Figure 6 for Figure 3 A magnified schematic diagram of the local structure at point C;

[0032] Figure 7 for Figure 3 A magnified schematic diagram of the structure at point D.

[0033] In the diagram: 1. Mold shell; 2. Mounting stud; 3. Fixing sleeve; 4. Buffer assembly; 401. Buffer sleeve; 402. First buffer spring; 403. Second buffer spring; 5. Movable block; 6. Mold core mounting assembly; 601. Mounting sleeve; 602. Slide groove; 603. Slider; 7. First limiting assembly; 701. First limiting groove; 702. First limiting block; 8. Unlocking assembly; 801. Push bar; 802. Fixing block; 803. Limiting rod; 804. First connecting spring; 9. Second limiting assembly; 901. Second limiting groove; 902. 10. Limiting block; 11. Moving plate; 12. Reset spring; 13. Linkage mechanism; 14. Linkage push plate; 15. Sliding rod; 16. Second connecting spring; 17. Transmission arm; 18. Fixed assembly; 19. Movable rod; 10. Telescopic rod; 11. Third connecting spring; 12. Clamping block; 12. Pneumatic assembly; 13. First pneumatic cylinder; 14. First pneumatic piston rod; 15. Second pneumatic cylinder; 16. Second pneumatic piston rod; 17. Vent groove; 18. Third buffer spring. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] like Figures 1 to 7 As shown, the present invention provides a secondary riveting mold structure, including a mold housing 1; a fixed cylinder 3 disposed inside the mold housing 1; a buffer assembly 4 disposed inside the mold housing 1 and located outside the fixed cylinder 3; a movable block 5 movably installed inside the fixed cylinder 3; a mold core mounting assembly 6 including a mounting sleeve 601, the mounting sleeve 601 being movably installed at the bottom of the movable block 5, and the outer end of the mounting sleeve 601 being fixedly connected to the inner wall of the fixed cylinder 3; the movable block 5 having grooves 602 on both sides located in the top of the mounting sleeves 601; a slider 603 located in the inner wall of the grooves 602 being provided at the top of the inner end of the mounting sleeves 601; a first limiting assembly 7 being provided between the mounting sleeves 601; and an unlocking assembly 8 located on one side of the first limiting assembly 7 being provided between the mounting sleeves 601.

[0036] By using four mounting sleeves 601, mold cores of different sizes and models can be screwed into the interior. When the outer mounting sleeve 601 is rotated, it will squeeze and push the unlocking component 8 to release the fixing effect between the inner mounting sleeve 601 and the outer mounting sleeve 601, so that the inner mounting sleeve 601 can be smoothly pushed into the movable block 5, so that the mold core can be screwed into the outer mounting sleeve 601.

[0037] like Figure 2 As shown, a mounting stud 2 is provided at one end of the mold housing 1, and the movable block 5 is elastically connected to the inner cavity of the fixed cylinder 3 through a third buffer spring 14.

[0038] The above solution is adopted: by setting the mounting stud 2 and the third buffer spring 14, the mold housing 1 can be installed as a whole on a general punch press by the mounting stud 2. When the mold core is installed inside the corresponding mounting sleeve 601, the force of the third buffer spring 14 can buffer the force when the mold core is pushed down and the movable block 5 is retracted into the fixed cylinder 3.

[0039] like Figure 2 As shown, the buffer assembly 4 includes a buffer sleeve 401, a first buffer spring 402, and a second buffer spring 403.

[0040] The buffer sleeve 401 is movably installed between the mold housing 1 and the fixed cylinder 3. One end of the buffer sleeve 401 is elastically connected to the inner wall of the mold housing 1 through the first buffer spring 402, and the other end of the buffer sleeve 401 is elastically connected to the surface of the fixed cylinder 3 through the second buffer spring 403.

[0041] The above solution is adopted: by setting a first buffer spring 402 and a second buffer spring 403, when the mold housing 1 is subjected to secondary riveting downwards, the bottom of the buffer sleeve 401 can come into contact with the metal plate, and then be buffered by the first buffer spring 402 and the second buffer spring 403.

[0042] like Figure 4 As shown, the first limiting component 7 includes a first limiting groove 701 and a first limiting block 702;

[0043] The first limiting groove 701 is formed on the outside of the mounting sleeve 601, and the first limiting block 702 is set on the inside of the mounting sleeve 601 and located inside the first limiting groove 701.

[0044] By adopting the above solution: when the entire mounting sleeve 601 is squeezed and pushed to one side, the inner cavity of the first limiting groove 701 on the outer side of the mounting sleeve 601 will slide with the surface of the first limiting block 702, thereby limiting the movement of the pushed mounting sleeve 601.

[0045] like Figure 4 As shown, the unlocking component 8 includes a push bar 801, a fixing block 802, a limiting rod 803, and a first connecting spring 804;

[0046] The push bar 801 is movably installed inside the mounting sleeve 601, the fixing block 802 is movably installed inside the mounting sleeve 601 and located on one side of the push bar 801, the limiting rod 803 is set inside the mounting sleeve 601 and is slidably connected to one end of the fixing block 802, and the fixing block 802 is elastically connected to the inside of the mounting sleeve 601 through the first connecting spring 804.

[0047] The above solution is adopted: by setting a fixed block 802, when the push bar 801 is pushed to one side, the inclined surface on one side of the push bar 801 will squeeze and push the inclined surface on the other side of the fixed block 802, so that the fixed block 802 as a whole will move towards each other, so that the protruding part of the outer end of the fixed block 802 will move out of the first limiting groove 701, thereby releasing the effect of fixing the mounting sleeves 601 together through the first limiting groove 701.

[0048] like Figure 5 As shown, the installation sleeve 601 is provided with a second limiting component 9 located on the outer side of the other end of the push bar 801. The second limiting component 9 includes a second limiting groove 901 and a second limiting block 902.

[0049] The second limiting groove 901 is opened inside the mounting sleeve 601 and is located on the outer side of the other end of the push bar 801. The second limiting block 902 is fixedly installed on the outer side of the other end of the push bar 801 and is located inside the second limiting groove 901.

[0050] The above solution is adopted: by setting a second limiting block 902, the movement of the push bar 801 as a whole can be limited by the sliding of the second limiting block 902 in the inner cavity of the second limiting groove 901.

[0051] like Figure 3 As shown, a movable plate 10 located on one side of the mounting sleeve 601 is movably installed inside the movable block 5. The movable plate 10 is elastically connected to the inside of the movable block 5 through a return spring 11.

[0052] The above solution is adopted: by setting a reset spring 11, when the entire mounting sleeve 601 is pushed to one side, it will simultaneously push one end of the moving plate 10, thereby compressing the reset spring 11. When the elastic force of the reset spring 11 is released, it will push the moving plate 10 and the mounting sleeve 601 to move and reset.

[0053] like Figure 6 As shown, a linkage mechanism 12 is provided in the middle of one side of the movable block 5. The linkage mechanism 12 includes a linkage push plate 1201, a sliding rod 1202, a second connecting spring 1203, a transmission arm 1204, and a fixing component 1205.

[0054] The linkage push plate 1201 is movably installed in the middle of the inner cavity of the movable block 5. The sliding rod 1202 is fixedly installed in the inner cavity of the movable block 5, and the sliding rod 1202 is located above the linkage push plate 1201. The fixing component 1205 is slidably connected to the surface of the sliding rod 1202, and the outer end of the fixing component 1205 extends to the top outer end of the movable block 5. The inner end of the fixing component 1205 is elastically connected to the inner wall of the movable block 5 through the second connecting spring 1203. The transmission arm 1204 is hinged between the two sides of the top of the linkage push plate 1201 and the inner end of the fixing component 1205.

[0055] The above solution involves a transmission arm 1204. When the linkage push plate 1201 is pushed upward, the transmission arm 1204 deflects and pushes the inner end of the fixing component 1205 to move in opposite directions along the surface of the sliding rod 1202. This causes the second connecting spring 1203 to be compressed. The opposite movement of the outer end of the fixing component 1205 causes the outer end of the fixing component 1205 to insert into the inner groove of the slider 603 that has moved to the top. This fixes the slider 603 and multiple mounting sleeves 601 together, improving the fixing effect after the mounting sleeves 601 are pushed upward by rivet screws of different sizes.

[0056] like Figure 7 As shown, the fixing assembly 1205 includes a movable rod 12051, a telescopic rod 12052, a third connecting spring 12053, and a locking block 12054;

[0057] The movable rod 12051 is slidably connected to the surface of the sliding rod 1202, and the telescopic rod 12052 is slidably connected to the inner wall of the outer end of the movable rod 12051. The inner end of the telescopic rod 12052 is elastically connected to the inner wall of the movable rod 12051 through the third connecting spring 12053. The clamping block 12054 is set at the inner end of the telescopic rod 12052, and the size of the clamping block 12054 is exactly the same as the inner groove size of the slider 603.

[0058] The above solution involves a locking block 12054. When the slider 603 moves upward along the surface of the groove 602, it presses against the inclined surface of the locking block 12054, causing the locking block 12054 and the telescopic rod 12052 to move in opposite directions and compress the third connecting spring 12053. Then, when the locking block 12054 is aligned with the inner groove of the slider 603, the elastic force of the third connecting spring 12053 will be released, pushing the two telescopic rods 12052 and the locking block 12054 to move in opposite directions. Finally, the inner end of the locking block 12054 is inserted into the inner groove of the slider 603, achieving a locking and fixing effect on the slider 603 as a whole after it moves upward.

[0059] like Figure 7 As shown, the movable block 5 is equipped with a pneumatic assembly 13 located at the top of the movable rod 12051. The pneumatic assembly 13 includes a first pneumatic cylinder 1301, a first pneumatic piston rod 1302, a second pneumatic cylinder 1303, a second pneumatic piston rod 1304, and a ventilation groove 1305.

[0060] The first pneumatic cylinder 1301 is fixedly installed inside the movable block 5 and is located on top of the clamping block 12054. The first pneumatic piston rod 1302 is movably installed in the inner cavity of the first pneumatic cylinder 1301. The second pneumatic cylinder 1303 is fixedly installed inside the movable block 5 and is located above the middle of the movable rod 12051. The second pneumatic piston rod 1304 is movably installed in the inner cavity of the second pneumatic cylinder 1303. The second pneumatic cylinder 1303 is connected to the first pneumatic cylinder 1301 through the air vent 1305.

[0061] Using the above scheme: when the slider 603 moves upward, it will push the first pneumatic piston rod 1302 to move upward as a whole, which will then push the gas on the inner wall of the first pneumatic cylinder 1301 to be introduced into the inner cavity of the second pneumatic cylinder 1303 through the vent groove 1305. Finally, it will push the second pneumatic cylinder 1303 to move downward, so that the inner end of the second pneumatic cylinder 1303 is inserted into the top of the movable rod 12051, which can improve the overall effect of the movable rod 12051.

[0062] Working principle and usage process of this invention:

[0063] First, when the operator needs to install the mold core inside the corresponding mounting sleeve 601, and it needs to be installed inside the inner mounting sleeve 601, the installation connection can be made directly along the internal thread.

[0064] When it needs to be installed inside other mounting sleeves 601, one end of the pusher bar 801 is first squeezed and pushed, causing the whole thing to move to one end. This allows the inclined surface of the other end of the pusher bar 801 to squeeze and push the inclined surface of the other end of the fixing block 802, thereby pushing the fixing block 802 to move in opposite directions. This causes the outer end of the fixing block 802 to disengage from the first limiting block 702, thus releasing the fixed connection between the mounting sleeve 601 and its inner mounting sleeve 601 through the first limiting block 702. Then, a mold core of the corresponding size can be rotated into the mounting sleeve 601. At this time, the inner mounting sleeve 601 will be pushed into the movable block 5, and finally the mold core will be successfully installed inside the corresponding mounting sleeve 601.

[0065] When the mounting sleeve 601 is pushed into the movable block 5, the slider 603 slides along the inner wall of the slide groove 602 to one side. Then, when the mold core is fully installed in the mounting sleeve 601, it pushes the linkage push plate 1201 upwards, causing the transmission arm 1204 to be driven to deflect and push the inner ends of the two movable rods 12051 to move in opposite directions along the surface of the sliding rod 1202. This causes the third connecting spring 12053 and the clamping block 12054 at the outer ends of the two movable rods 12051 to extend outwards. Subsequently, when the slider 603 slides along the inner wall of the slide groove 602 to move in opposite directions... After moving upward along the surface of the slide groove 602, it will first push the inclined surface of the clamping block 12054, and squeeze the clamping block 12054 and the telescopic rod 12052 to move towards each other, while squeezing the third connecting spring 12053. Then, when the inner groove of the slider 603 is aligned with the outer end of the clamping block 12054, the elastic force of the third connecting spring 12053 will be released, smoothly pushing the telescopic rod 12052 and the clamping block 12054 to move in opposite directions until the clamping block 12054 is inserted into the inner groove of the slider 603, finally fixing the upward-pushed mounting sleeve 601 and the slider 603.

[0066] At the same time, when the slider 603 moves to the top of the slide groove 602, it will push the first pneumatic piston rod 1302 upward into the inner cavity of the first pneumatic cylinder 1301, so that the gas at the top of the inner cavity of the first pneumatic cylinder 1301 is introduced into the inner cavity of the second pneumatic cylinder 1303 through the vent groove 1305. This will increase the air pressure at the top of the inner cavity of the second pneumatic cylinder 1303, which will push the second pneumatic piston rod 1304 downward, so that the inner end of the second pneumatic piston rod 1304 is inserted into the inner groove at the middle of the top of the movable rod 12051, thus strengthening the fixing effect of the movable rod 12051.

[0067] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0068] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A secondary riveting die structure, characterized in that, Includes mold housing (1); A fixed cylinder (3) is disposed inside the mold housing (1); The buffer assembly (4) is located inside the mold housing (1) and outside the fixed cylinder (3); The movable block (5) is movably installed inside the fixed cylinder (3); The mold core mounting assembly (6) includes a mounting sleeve (601), which is movably mounted on the bottom of the movable block (5), and the outer end of the mounting sleeve (601) is fixedly connected to the inner wall of the fixed cylinder (3). The movable block (5) has a sliding groove (602) on both sides located in the top of the mounting sleeve (601). The top of the inner end of the mounting sleeve (601) is provided with a slider (603) located in the inner wall of the sliding groove (602). A first limiting component (7) is provided between the mounting sleeves (601), and an unlocking component (8) located on one side of the first limiting component (7) is provided between the mounting sleeves (601).

2. The secondary riveting die structure according to claim 1, characterized in that: One end of the mold housing (1) is provided with a mounting stud (2), and the movable block (5) is elastically connected to the inner cavity of the fixed cylinder (3) through a third buffer spring (14).

3. The secondary riveting die structure according to claim 1, characterized in that: The buffer assembly (4) includes a buffer sleeve (401), a first buffer spring (402), and a second buffer spring (403); The buffer sleeve (401) is movably installed between the mold housing (1) and the fixed cylinder (3). One end of the buffer sleeve (401) is elastically connected to the inner wall of the mold housing (1) through the first buffer spring (402), and the other end of the buffer sleeve (401) is elastically connected to the surface of the fixed cylinder (3) through the second buffer spring (403).

4. The secondary riveting die structure according to claim 1, characterized in that: The first limiting component (7) includes a first limiting groove (701) and a first limiting block (702); The first limiting groove (701) is opened on the outside of the mounting sleeve (601), and the first limiting block (702) is disposed on the inside of the mounting sleeve (601) and located inside the first limiting groove (701).

5. The secondary riveting die structure according to claim 1, characterized in that: The unlocking component (8) includes a push bar (801), a fixing block (802), a limiting rod (803), and a first connecting spring (804); The push bar (801) is movably installed inside the mounting sleeve (601), the fixing block (802) is movably installed inside the mounting sleeve (601) and located on one side of the push bar (801), the limiting rod (803) is disposed inside the mounting sleeve (601) and is slidably connected to one end of the fixing block (802), and the fixing block (802) is elastically connected to the inside of the mounting sleeve (601) through the first connecting spring (804).

6. The secondary riveting die structure according to claim 1, characterized in that: The mounting sleeve (601) is provided with a second limiting component (9) located outside the other end of the push bar (801). The second limiting component (9) includes a second limiting groove (901) and a second limiting block (902). The second limiting groove (901) is opened inside the mounting sleeve (601) and is located on the outside of the other end of the push bar (801). The second limiting block (902) is fixedly installed on the outside of the other end of the push bar (801) and is located inside the second limiting groove (901).

7. The secondary riveting die structure according to claim 1, characterized in that: The movable block (5) is internally mounted with a movable plate (10) located on one side of the mounting sleeve (601), and the movable plate (10) is elastically connected to the interior of the movable block (5) via a return spring (11).

8. The secondary riveting die structure according to claim 1, characterized in that: The movable block (5) is provided with a linkage mechanism (12) in the middle. The linkage mechanism (12) includes a linkage push plate (1201), a sliding rod (1202), a second connecting spring (1203), a transmission arm (1204), and a fixing component (1205). The linkage push plate (1201) is movably installed in the middle of the inner cavity of the movable block (5). The sliding rod (1202) is fixedly installed in the inner cavity of the movable block (5) and the sliding rod (1202) is located above the linkage push plate (1201). The fixing component (1205) is slidably connected to the surface of the sliding rod (1202), and the outer end of the fixing component (1205) extends to the top outer end of the movable block (5). The inner end of the fixing component (1205) is elastically connected to the inner wall of the movable block (5) through the second connecting spring (1203). The transmission arm (1204) is hinged between the two sides of the top of the linkage push plate (1201) and the inner end of the fixing component (1205).

9. The secondary riveting die structure according to claim 8, characterized in that: The fixing component (1205) includes a movable rod (12051), a telescopic rod (12052), a third connecting spring (12053), and a locking block (12054); The movable rod (12051) is slidably connected to the surface of the sliding rod (1202), and the telescopic rod (12052) is slidably connected to the inner wall of the outer end of the movable rod (12051). The inner end of the telescopic rod (12052) is elastically connected to the inner wall of the movable rod (12051) through a third connecting spring (12053). The clamping block (12054) is disposed at the inner end of the telescopic rod (12052), and the size of the clamping block (12054) is exactly the same as the inner groove size of the slider (603).

10. The secondary riveting die structure according to claim 1, characterized in that: The movable block (5) is provided with a pneumatic assembly (13) located at the top of the movable rod (12051). The pneumatic assembly (13) includes a first pneumatic cylinder (1301), a first pneumatic piston rod (1302), a second pneumatic cylinder (1303), a second pneumatic piston rod (1304), and a ventilation groove (1305). The first pneumatic cylinder (1301) is fixedly installed inside the movable block (5), and the first pneumatic cylinder (1301) is located at the top of the clamping block (12054). The first pneumatic piston rod (1302) is movably installed in the inner cavity of the first pneumatic cylinder (1301). The second pneumatic cylinder (1303) is fixedly installed inside the movable block (5), and the second pneumatic cylinder (1303) is located above the middle part of the movable rod (12051). The second pneumatic piston rod (1304) is movably installed in the inner cavity of the second pneumatic cylinder (1303). The second pneumatic cylinder (1303) is connected to the first pneumatic cylinder (1301) through the air vent (1305).

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