Clamping hand automatic nut feeding mechanism for in-mold riveting

Abstract

The utility model provides an in-mold riveting clamp hand automatic nut feeding mechanism which comprises a vibration disc conveying module and a grabbing disc clamping mechanism, the grabbing disc clamping mechanism comprises a normally-closed grabbing disc, a stamping die assembly is arranged on the upper portion of the grabbing disc clamping mechanism, the stamping die assembly comprises an upper die lifting pin, and a lower die lifting pin is arranged on the lower portion of the grabbing disc clamping mechanism. A riveting punch is arranged on the lower portion of the upper die lifting pin, the upper die lifting pin and the riveting punch move synchronously, through the collaborative design of the vibration disc conveying module and the normally-closed grabbing disc, continuous and accurate feeding of nuts is achieved, the continuous die action of the stamping die assembly is matched, the riveting process is completely integrated into the stamping process, the waiting time between the processes is eliminated, and the riveting efficiency is improved. Stamping and riveting rhythms are synchronous, and efficiency is improved by more than 30%.

Description

Technical Field

[0001] This utility model relates to the field of automotive riveting mold manufacturing technology, and more specifically, to an automatic nut feeding mechanism for in-mold riveting. Background Technology

[0002] Riveting is a green connection method that uses press riveting, expansion riveting, extrusion riveting, or pull riveting to connect nuts and other components to sheet metal. Press riveting involves using a special equipment and a riveting die to apply pressure to partially or completely press the riveted component into the sheet metal. Extrusion riveting involves using a special equipment and a riveting die to apply pressure to partially expand the riveted component, allowing it to engage with the sheet metal. Extrusion riveting involves using a special equipment and a riveting die to apply pressure to partially force the riveted component into the sheet metal. Pull riveting uses a special tool called a pull gun. The bolt on the pull gun head engages with the internal thread of the rivet nut, causing the bolt to rotate and thus the nut to move relative to it, resulting in expansion and deformation of the thin-walled area of ​​the nut until it is firmly pressed against the sheet metal.

[0003] In traditional sheet metal stamping production, the rivet nut process usually adopts a processing mode that separates stamping and riveting. That is, after stamping, the workpiece needs to be transferred to the subsequent riveting station, and the nut is riveted manually or by semi-automatic equipment. The production efficiency of rivets nut is low. The stamping and riveting processes are not matched. The stamping cycle is fast, while the riveting requires secondary positioning, feeding and clamping, resulting in low overall efficiency. The transfer of multiple processes increases equipment investment and maintenance costs. It is difficult to achieve efficient integration of continuous dies due to reliance on manual intervention or single machine operation. At the same time, a single riveting die can only be used for nuts of a fixed specification, and it takes time to adjust when changing models.

[0004] While existing technologies have attempted in-mold riveting solutions, they still suffer from insufficient feeding accuracy, such as easy jamming when directly feeding material from a vibratory feeder, poor reliability of clamping mechanisms, and high cost and complex maintenance of robotic arms, as exemplified by patent numbers CN113714401A and CN104308015B. Therefore, there is an urgent need for a high-precision and high-stability in-mold riveting automatic feeding mechanism to achieve seamless integration of stamping and riveting processes. Utility Model Content

[0005] In view of this, the present invention proposes an automatic nut feeding mechanism for in-mold riveting, including a vibratory feeder module 10 and a gripper clamping mechanism 20. The gripper clamping mechanism 20 includes a normally closed gripper 23. A stamping die assembly 40 is provided on the upper part of the gripper clamping mechanism 20. The stamping die assembly 40 includes an upper die ejector pin 41. A riveting punch 42 is provided below the upper die ejector pin 41. The upper die ejector pin 41 and the riveting punch 42 move synchronously. Through the coordinated design of the vibratory feeder module and the normally closed gripper 23, continuous and precise nut feeding is achieved. With the continuous die action of the stamping die assembly 40, the riveting process is fully integrated into the stamping process, eliminating the waiting time between processes, synchronizing the stamping and riveting cycles, and improving efficiency by more than 30%.

[0006] An automatic nut-feeding mechanism for in-mold riveting is characterized by comprising a vibratory feeder module 10 and a gripper clamping mechanism 20. The gripper clamping mechanism 20 includes a normally closed gripper 23. A stamping die assembly 40 is provided on the upper part of the gripper clamping mechanism 20. The stamping die assembly 40 includes an upper die pin 41 and a riveting punch 42 is provided on the lower part of the upper die pin 41. The upper die pin 41 and the riveting punch 42 move synchronously, conveying the nut to the normally closed gripper 23 via a track 11 provided on the vibratory feeder module 10. The stamping die assembly 40 presses down, and the riveting punch 42 first connects with the nut to limit the nut, driving the nut to continue pressing down. The upper die pin 41 contacts the inner wall of the normally closed gripper 23 and opens the normally closed gripper 23. The riveting punch 42, carrying the nut, is released to the corresponding position inside the mold 50 to be riveted and riveted.

[0007] In some embodiments, the gripper clamping mechanism 20 further includes a gripper body 21, which is connected to a claw plate fixing plate 22 for fixing the gripper clamping mechanism 20. The claw plate fixing plate 22 is located on the upper part of the riveting mold 50 to be riveted, and the lower part of the riveting mold 50 is provided with a lower mold base 60, which is fixedly connected to the claw plate fixing plate 22.

[0008] Furthermore, the normally closed gripper 23 includes two grippers 231 arranged symmetrically on the left and right sides, and each gripper 231 is rotatably connected to the gripper body 21 through a gripper rotating pin 232.

[0009] Furthermore, the gripper 231 is a bent structure that bends toward the nut.

[0010] In some embodiments, each of the grippers 231 has a bend member 233 on its inner wall. The two bend members 233 are arranged symmetrically on the left and right and do not contact each other. The bend member 233 and the hook of the bending structure of the gripper 231 form a nut receiving chamber for limiting the nut.

[0011] Furthermore, the vertical edge of the corner piece 233 is fixedly connected to the inner wall of the gripper 231 connected to it, and a gap is left between the horizontal edges of the corner piece 233 for riveting the punch 42 through but not in contact with the horizontal edge of the corner piece 233, so as to avoid the risk of jamming during the feeding process.

[0012] Furthermore, each of the grippers 231 has a tapered inclined surface 234 on its inner wall, and the tapered inclined surface 234 is located on the upper part of the angled member 233. The tapered inclined surface 234 is inclined towards the upper mold top pin 41. The upper mold top pin 41 squeezes open the left and right grippers 231 through the tapered inclined surface 234, and automatically opens under the pressure of the upper mold top pin 41 to ensure that there is no deviation when the nut is released.

[0013] Furthermore, the inclination angle of the conical inclined plane 234 is 30-45°.

[0014] In some embodiments, each gripper 231 is provided with a spring stop 235 on its outer side. The spring stop 235 is fixedly connected to the gripper body 21. There is a return spring 236 between each gripper 231 and its corresponding spring stop 235. Under normal conditions, the gripper 231 is kept closed by the return spring 236. When the upper mold top pin 41 is pressed down to contact the inner wall of the gripper 231, the gripper 231 is passively opened and the return spring 236 is compressed.

[0015] In some embodiments, the gripping mechanism 20 is further provided with a sensor 30. When the presence of the nut is detected, the upper die ejector pin 41 of the stamping die assembly 40 is activated to ensure that the stamping die assembly 40 is activated only after the nut is detected, thereby reducing dry running losses.

[0016] In some embodiments, the riveting punch 42 is designed to be narrow at the bottom and wide at the top, the maximum diameter of the riveting punch 42 is smaller than the diameter of the upper die ejector pin 41, and the diameter of the upper die ejector pin 41 is larger than the maximum distance between the two tapered inclined surfaces 234.

[0017] Furthermore, the riveting mold 50 is equipped with a guide groove to guide the nut to be accurately positioned and riveted.

[0018] The beneficial effects of this utility model are as follows: This utility model proposes an automatic nut feeding mechanism for in-mold riveting, including a vibratory feeder module 10 and a gripper clamping mechanism 20. The gripper clamping mechanism 20 includes a normally closed gripper 23. A stamping die assembly 40 is provided on the upper part of the gripper clamping mechanism 20. The stamping die assembly 40 includes an upper die ejector pin 41. A riveting punch 42 is provided below the upper die ejector pin 41. The upper die ejector pin 41 and the riveting punch 42 move synchronously, feeding the nut to the feeder via the track 11 provided on the vibratory feeder module 10. The normally closed gripper plate 23 is used to press down the stamping die assembly 40. The riveting punch 42 is first connected to the nut to limit the nut and drive the nut to continue pressing down. The upper die top pin 41 contacts the inner wall of the normally closed gripper plate 23 and opens the normally closed gripper plate 23. The riveting punch 42, carrying the nut, is released to the corresponding position inside the riveting die 50 and riveting is performed. This structure eliminates the need for subsequent riveting equipment and manual operation, reducing equipment investment and labor costs. At the same time, the modular design facilitates maintenance. The nut specifications can be quickly switched through the clamping distance of the adjustable gripper 231. Attached Figure Description

[0019] Figure 1 This is a structural diagram of the automatic nut feeding mechanism for in-mold riveting of the present invention.

[0020] Figure 2 This is a structural diagram of the stamping die assembly of the in-mold riveting clamping automatic nut feeding mechanism of this utility model.

[0021] Figure 3 This is a structural diagram of the nut conveying mechanism of the in-mold riveting clamping automatic nut feeding mechanism of this utility model.

[0022] Figure 4 This is a partial structural diagram of the nut delivery mechanism of the in-mold riveting clamping automatic nut delivery mechanism of this utility model.

[0023] Figure 5 This is a front view of the gripper plate holding the in-mold riveting automatic nut feeding mechanism of this utility model.

[0024] Figure 6 This is a structural view of the front of the gripper plate after the top pin of the in-mold riveting automatic nut feeding mechanism of this utility model has been reset.

[0025] Figure 7 This is a top view of the gripper plate holding the in-mold riveting automatic nut feeding mechanism of this utility model.

[0026] Figure 8 This is a top view of the gripper plate after the top pin of the in-mold riveting automatic nut feeding mechanism of this utility model has been reset.

[0027] Explanation of symbols for key components.

[0028] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this utility model.

[0029] Vibratory feeder conveying module 10, track 11, gripper clamping mechanism 20, gripper body 21, gripper plate fixing plate 22, normally closed gripper 23, gripper 231, gripper rotating pin 232, angled piece 233, tapered inclined surface 234, spring stop block 235, return spring 236, sensor 30, stamping die assembly 40, upper die ejector pin 41, riveting punch 42, die to be riveted 50, lower die base 60. Detailed Implementation

[0030] Example 1:

[0031] like Figure 1-8 As shown, an automatic nut-feeding mechanism for in-mold riveting includes a vibratory feeder module 10 and a gripper clamping mechanism 20. The gripper clamping mechanism 20 includes a normally closed gripper 23. Nuts are fed to the normally closed gripper 23 via a track 11 on the vibratory feeder module 10. The gripper clamping mechanism 20 also includes a gripper body 21, which is connected to a claw plate fixing plate 22 for fixing the gripper clamping mechanism 20. The claw plate fixing plate 22 is located above the riveting mold 50 to be riveted. The normally closed gripper 23... The device includes two symmetrically arranged grippers 231. Each gripper 231 is rotatably connected to the gripper body 21 via a gripper rotating pin 232. The grippers 231 are bent structures that bend towards the nut. Each gripper 231 has a bend member 233 on its inner wall. The two bend members 233 are symmetrically arranged and do not contact each other. The bend member 233 and the hook of the bent structure of the gripper 231 form a receiving cavity for the nut, which is used to limit the nut. The vertical side of the bend member 233 is fixedly connected to the inner wall of the gripper 231 to which it is connected.

[0032] The upper part of the gripping mechanism 20 is provided with a stamping die assembly 40. The stamping die assembly 40 includes an upper die pin 41 and a riveting punch 42 at the lower part of the upper die pin 41. The upper die pin 41 and the riveting punch 42 move synchronously. There is a gap between the horizontal edges of the corner piece 233. The gripping mechanism 20 is also provided with a sensor 30. When the presence of the nut is detected, the upper die pin 41 of the stamping die assembly 40 is activated. The stamping die assembly 40 presses down. The riveting punch 42 passes through but does not contact the horizontal edge of the corner piece 233. The riveting punch 42 is first connected to the nut to limit the nut and drive the nut to continue to press down.

[0033] Each of the grippers 231 has a tapered inclined surface 234 on its inner wall, and the tapered inclined surface 234 is located on the upper part of the corner piece 233. The tapered inclined surface 234 is inclined towards the upper die pin 41, and the inclination angle of the tapered inclined surface 234 is 30-45°. The riveting punch 42 is designed to be narrow at the bottom and wide at the top. The maximum diameter of the riveting punch 42 is smaller than the diameter of the upper die pin 41, and the diameter of the upper die pin 41 is larger than the maximum distance between the two tapered inclined surfaces 234. The upper die pin 41 pushes open the left and right grippers 231 through the tapered inclined surface 234, so that the grippers 231 open and release the nut to the corresponding position inside the mold 50 to be riveted and riveted.

[0034] Each of the grippers 231 has a spring stop 235 on its outer side. The spring stop 235 is fixedly connected to the gripper body 21. There is a return spring 236 between each gripper 231 and its corresponding spring stop 235. Under normal conditions, the gripper 231 is kept closed by the return spring 236. When the upper die pin 41 is pressed down to contact the inner wall of the gripper 231, the gripper 231 is passively opened, the return spring 236 is compressed, and after the riveting punch 42 completes the riveting, the upper die pin 41 is reset, and the gripper 231 is reset by the return spring 236 to enter the next cycle.

[0035] The beneficial effects of this utility model are as follows: This utility model proposes an automatic nut feeding mechanism for in-mold riveting, including a vibratory feeder module 10 and a gripper clamping mechanism 20. The gripper clamping mechanism 20 includes a normally closed gripper 23. A stamping die assembly 40 is provided on the upper part of the gripper clamping mechanism 20. The stamping die assembly 40 includes an upper die ejector pin 41. A riveting punch 42 is provided below the upper die ejector pin 41. The upper die ejector pin 41 and the riveting punch 42 move synchronously, and the nut is fed through the track 11 provided on the vibratory feeder module 10. The normally closed gripper plate 23 is pressed down by the stamping die assembly 40. The riveting punch 42 is first connected to the nut to limit the nut and drive the nut to continue pressing down. The upper die top pin 41 contacts the inner wall of the normally closed gripper plate 23 and opens the normally closed gripper plate 23. The riveting punch 42, carrying the nut, is released to the corresponding position inside the riveting die 50 and riveting is performed. This eliminates the need for subsequent riveting equipment and manual operation, reducing equipment investment and labor costs. At the same time, the modular design facilitates maintenance. The nut specifications can be quickly switched through the clamping distance of the adjustable gripper 231.

[0036] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An in-mold riveting clamping automatic nut feeding mechanism, characterized in that: The device includes a vibratory feeder conveying module (10) and a gripper clamping mechanism (20). The gripper clamping mechanism (20) includes a normally closed gripper (23). The upper part of the gripper clamping mechanism (20) is provided with a stamping die assembly (40). The stamping die assembly (40) includes an upper die pin (41). The lower part of the upper die pin (41) is provided with a riveting punch (42). The upper die pin (41) and the riveting punch (42) move synchronously. The nut is conveyed to the normally closed gripper (23) through the track (11) provided on the vibratory feeder conveying module (10). The stamping die assembly (40) presses down. The riveting punch (42) is connected to the nut first to limit the nut and drive the nut to continue to press down. The upper die pin (41) contacts the inner wall of the normally closed gripper (23) and opens the normally closed gripper (23). The riveting punch (42) is released with the nut to the corresponding position inside the mold (50) to be riveted and riveted.

2. The in-mold riveting automatic nut feeding mechanism with gripper as described in claim 1, characterized in that: The gripper clamping mechanism (20) further includes a gripper body (21), which is connected to a claw plate fixing plate (22) for fixing the gripper clamping mechanism (20). The claw plate fixing plate (22) is located on the upper part of the riveting mold (50) to be riveted. The lower part of the riveting mold (50) is provided with a lower mold base (60), which is fixedly connected to the claw plate fixing plate (22).

3. The in-mold riveting automatic nut feeding mechanism with gripper as described in claim 1, characterized in that: The normally closed gripper disc (23) includes two grippers (231) arranged symmetrically on the left and right sides. Each gripper (231) is rotatably connected to the gripper disc body (21) through a gripper disc rotating pin (232).

4. The in-mold riveting automatic nut feeding mechanism with gripper as described in claim 3, characterized in that: Each of the grippers (231) has a bend member (233) on its inner wall. The two bend members (233) are arranged symmetrically on the left and right and do not contact each other. The bend member (233) and the hook of the bending structure of the gripper (231) form a nut receiving chamber for limiting the nut.

5. The in-mold riveting automatic nut feeding mechanism with gripper as described in claim 4, characterized in that: The vertical edge of the corner piece (233) is fixedly connected to the inner wall of the clamp (231) connected to it, and there is a gap between the horizontal edges of the corner piece (233) for riveting the punch (42) through but not in contact with the horizontal edge of the corner piece (233).

6. The in-mold riveting automatic nut feeding mechanism with gripper as described in claim 3, characterized in that: Each of the grippers (231) has a tapered inclined surface (234) on its inner wall and the tapered inclined surface (234) is located on the upper part of the corner piece (233). The tapered inclined surface (234) is inclined towards the upper mold top pin (41). The upper mold top pin (41) squeezes open the left and right grippers (231) through the tapered inclined surface (234), so that the grippers (231) open to release the nut.

7. The in-mold riveting automatic nut feeding mechanism with gripper as described in claim 6, characterized in that: The inclination angle of the conical inclined plane (234) is 30-45°.

8. The in-mold riveting automatic nut feeding mechanism with gripper as described in claim 3, characterized in that: Each of the grippers (231) is provided with a spring stop (235) on its outer side. The spring stop (235) is fixedly connected to the gripper body (21). There is a return spring (236) between each gripper (231) and its corresponding spring stop (235). Under normal conditions, the gripper (231) is kept closed by the return spring (236). When the upper mold top pin (41) is pressed down to contact the inner wall of the gripper (231), the gripper (231) is passively opened and the return spring (236) is compressed.

9. The in-mold riveting automatic nut feeding mechanism with gripper as described in claim 1, characterized in that: The gripping mechanism (20) is also equipped with a sensor (30). When the presence of the nut is detected, the upper die ejector pin (41) of the stamping die assembly (40) is activated.

10. The in-mold riveting automatic nut feeding mechanism with gripper as described in claim 1, characterized in that: The riveting punch (42) is designed to be narrow at the bottom and wide at the top. The maximum diameter of the riveting punch (42) is smaller than the diameter of the upper die pin (41), and the diameter of the upper die pin (41) is larger than the maximum distance between the two conical inclined surfaces (234).

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