Self-punching-riveting riveting device capable of automatically feeding rivets

Abstract

The utility model relates to a self-punching-riveting riveting device which can be fixed at the tail end of an arm of an industrial robot and has an automatic rivet feeding function. The self-punching-riveting riveting device comprises a guide bent pipe, an anti-reversing air cylinder assembly, a spring clamping piece assembly, a riveting pressing rod, a centering clamping mouth and a center-adjustable lower die. A self-punching riveting rivet enters a guiding bent pipe through a plastic material pipe, compressed air is adopted to blow the rivet into the riveting device, it is ensured that the rivet always stays in a spring clamping piece when an industrial robot does actions of various postures through an anti-reversing air cylinder assembly, and a riveting pressing rod is driven by a servo motor to press the rivet into the surface of a metal plate; and meanwhile, the centering clamping nozzle ensures that the axis of the rivet is always overlapped with the axis of the riveting pressing rod, and the equipment is simple in structure, complete in function and low in cost.

Description

Technical Field

[0001] The utility model relates to a self-piercing riveting device with an automatic nail feeding function, in particular to a riveting device which can be installed at the end of an industrial robot arm to realize an automated riveting process. Background Art

[0002] Self-pierce riveting technology is suitable for connecting different metal sheets, and many sheets have irregular shapes, requiring the riveting equipment to be mounted on a robot for flexible riveting. Traditional rivet feeding methods pre-store rivets in magazines and require manual pre-installation, which is labor-intensive for operators. Self-pierce riveting equipment with automatic rivet feeding is available overseas, but its structure is complex and extremely costly. Utility Model Content

[0003] In order to solve the above problems, the utility model provides a self-piercing riveting device with automatic nail feeding function, which can be fixed at the end of the industrial robot arm to perform flexible riveting work. The device has a simple structure, complete functions and low cost.

[0004] To achieve the above-mentioned purpose, the technical solution of the utility model is: a self-piercing riveting device with automatic nail feeding, comprising a guide elbow, a spring clip assembly, a riveting pressure rod, a centering clamp, and an adjustable lower die, wherein the riveting pressure rod is arranged at the end of the manipulator, the spring clip assembly is arranged at the lower end of the riveting pressure rod, the guide elbow is arranged on one side of the spring clip assembly, the rivet enters the spring clip assembly through the guide elbow and is limited, the centering clamp is arranged below the spring clip assembly, the riveting pressure rod moves vertically up and down, passes through the spring clip assembly, pushes the rivet to the upper surface of the metal sheet between the shaping clamp and the adjustable lower die, and then presses the rivet into the metal sheet with a certain pressure.

[0005] Preferably, it also includes an anti-backward cylinder assembly, which is connected to the spring clip assembly by bolts. The piston rod of the anti-backward cylinder assembly extends to close the rivet channel and limit the side of the rivet.

[0006] Preferably, the spring clip assembly is provided with two clips with micro springs that are symmetrically distributed on the left and right, and the two clips are provided with contoured surfaces consistent with the outer contour of the rivet, so as to maintain the rivet in a position waiting for riveting.

[0007] Preferably, the centering nozzle has a circle of marbles evenly distributed around the central axis, and the central axis coincides with the central axis of the riveting pressure rod, so that when the rivet is pressed down by the riveting pressure rod, its axis coincides with the central axis of the centering nozzle.

[0008] Preferably, the adjustable lower die is used to support the metal sheet and can be fine-tuned according to the actual central axis of the centering nozzle so that the axis of the adjustable lower die coincides with the axis of the centering nozzle.

[0009] Compared with the prior art, the present invention has the following beneficial effects:

[0010] 1. The self-piercing riveting device of the utility model drives the riveting pressure rod through a servo motor, providing precise pressure and displacement for the riveting process, pressing the rivet into the metal sheet to a certain depth, thereby being able to accurately control the mechanical properties after riveting.

[0011] 2. Compressed air blows the rivet to the guide elbow. After passing through the guide elbow, compressed air is added in the horizontal direction so that the rivet can finally enter the middle position of the spring clip assembly smoothly, avoiding the rivet not being able to reach the position due to insufficient compressed air pressure for blowing the rivet, or the rivet slowing down its movement speed due to impact in the elbow.

[0012] 3. The symmetrically distributed spring clips maintain the rivet in the riveting position. The elastic force of the spring clips is just enough to make the rivet knock the spring clips apart while staying between the two clips. The anti-backward cylinder prevents the rivet from returning to the material channel due to various movements of the robot.

[0013] 4. The centering jaws align the rivet axis with the centerline of the riveting rod to prevent the rivet from flipping while being pressed into the metal sheet. The centering jaws also preload the metal sheet, generating a maximum preload of 700kgf between the two layers of sheet metal during the entire riveting process. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0015] Figure 2 It is an enlarged schematic diagram of the structure of a self-piercing riveting device with automatic nail feeding.

[0016] Figure 3 It is a cross-sectional view of a self-piercing riveting device with automatic nail feeding.

[0017] Figure 4 yes Figure 3 A partial enlarged view of the .

[0018] Figure 5 yes Figure 4 A partial enlarged view of the centering clamping nozzle.

[0019] Figure 6 is a cross-sectional view of the spring clip assembly.

[0020] In the figure; 1- guide elbow, 2- anti-backward cylinder assembly, 3- spring clip assembly, 4- riveted pressure rod, 5- centering clamp, 6- adjustable centering lower die. DETAILED DESCRIPTION

[0021] Below is the attached figure ( Figures 1-6 ) and embodiments illustrate the present invention. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention. Furthermore, the technical features involved in the various embodiments of the present invention described below may be combined with one another as long as they do not conflict with one another.

[0022] like Figure 1 、 3 As shown, the overall structure of this utility model includes a servo drive mechanism I and a self-piercing riveting device II. Drive mechanism I is a servo motor that can provide a maximum vertical pressure of 100 kN and a vertical travel of 109 mm for the riveting rod. The riveting rod can achieve a repeatable positioning accuracy of ±0.01 mm.

[0023] like Figure 2 、 4 As shown, the self-piercing riveting device of the present invention includes a guide elbow 1, an anti-backward cylinder assembly 2, a spring clip assembly 3, a riveting pressure rod 4, a centering clamp 5, and an adjustable lower die 6. The riveting pressure rod 4 is arranged at the end of the manipulator and is connected to the servo motor. The spring clip assembly 3 is arranged at the lower end of the riveting pressure rod 4. The guide elbow 1 is arranged on one side of the spring clip assembly 3. The rivet enters the spring clip assembly 3 through the guide elbow 1 and is limited. The centering clamp 5 is arranged below the spring clip assembly 3. The riveting pressure rod 4 moves vertically up and down, passes through the spring clip assembly 3, pushes the rivet to the upper surface of the metal sheet between the shaping clamp 5 and the adjustable lower die 6, and then presses the rivet into the metal sheet with a certain pressure.

[0024] Furthermore, it also includes an anti-backward cylinder assembly 2 arranged on the top side of the spring clip assembly 3, and connected to the spring clip assembly 3 by bolts. After the spring clip assembly 3 clamps the rivet, the piston rod of the anti-backward cylinder assembly extends to close the rivet feed channel and limit the side of the rivet.

[0025] Specifically, the guide elbow described in this embodiment is made of spring steel with a hardness of HRC40, which offers a certain degree of wear resistance. The inner wall of the guide elbow 1 has an opening for blowing compressed air. After the rivet passes through the guide elbow, compressed air is blown out of the opening, ensuring that the rivet reaches the riveted position through the guide elbow 1 and the feed channel of the spring clip assembly 3. The spring clip assembly is made of spring steel with a surface roughness of 0.8, which reduces friction during rivet passage. It also has a contoured surface that matches the rivet's external profile. Micro-springs control the clamping and separation of the spring clip, thereby clamping and supporting the rivet. Once the rivet is positioned between the spring clips, the anti-reverse cylinder piston rod extends, closing the rivet channel and providing a limiter on the side of the rivet, preventing the rivet from reversing or flipping due to gravity when the robot arm moves at various angles. After the magnetic switch on the cylinder detects that the piston rod has extended, the riveting pressure rod presses the rivet down into the centering nozzle at a certain speed and pressure. At this time, the marbles evenly distributed on the inner wall of the centering nozzle 5 can make the rivet on the central axis of the centering nozzle. One side of the marbles is provided with elastic material, so that the rivet cap can press the marbles into the inner wall of the centering nozzle during the descent process, so that the rivet can smoothly pass through the centering nozzle and reach the upper surface of the metal sheet. The riveting pressure rod continues to press the rivet into the double-layer metal sheet. The adjustable lower die 6 supports the sheet and also limits the outer contour of the back of the riveted point. The adjustable lower die 6 is used to support the metal sheet and can be fine-tuned according to the actual central axis of the centering nozzle 5 so that the axis of the adjustable lower die 6 coincides with the axis of the centering nozzle 5. The adjustable lower die with a different axis can be replaced for adaptation.

[0026] The contents not described in detail in this utility model specification are prior art known to those skilled in the art. It is noted that the above description is intended to help those skilled in the art understand the present invention, but does not limit the scope of protection of the present invention. Any equivalent substitution, modification, improvement, or simplification of the above description that does not depart from the essence of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A self-piercing riveting device with automatic nail feeding, characterized by: The invention comprises a guide elbow (1), an anti-backward cylinder assembly (2), a spring clip assembly (3), a riveting pressure rod (4), a centering clamp (5), and an adjustable lower die (6), wherein the riveting pressure rod (4) is arranged at the end of the manipulator, the spring clip assembly (3) is arranged at the lower end of the riveting pressure rod (4), the guide elbow (1) is arranged on one side of the spring clip assembly (3), the rivet enters the spring clip assembly (3) through the guide elbow (1) and is limited, the centering clamp (5) is arranged below the spring clip assembly (3), the riveting pressure rod (4) moves vertically up and down, passes through the spring clip assembly (3), pushes the rivet to the upper surface of the metal plate between the shaping clamp (5) and the adjustable lower die (6), and then presses the rivet into the metal plate with a certain pressure.

2. The self-piercing riveting device with automatic nail feeding according to claim 1, characterized in that: It also includes an anti-backward cylinder assembly (2), which is connected to the spring clip assembly (3) through bolts. The piston rod of the anti-backward cylinder assembly (2) extends to close the rivet channel and limit the side of the rivet.

3. The self-piercing riveting device with automatic nail feeding according to claim 1, characterized in that: The spring clip assembly (3) is provided with two clips with micro springs that are symmetrically distributed on the left and right sides. The two clips are provided with contoured surfaces that are consistent with the outer contour of the rivet, so as to maintain the rivet in a waiting riveting position.

4. The self-piercing riveting device with automatic nail feeding according to claim 1, characterized in that: The centering nozzle (5) has a circle of marbles evenly distributed around the central axis, and the central axis coincides with the central axis of the riveting pressure rod (4), so that when the rivet is pressed down by the riveting pressure rod (4), its axis coincides with the central axis of the centering nozzle (5).

5. The self-piercing riveting device with automatic nail feeding according to claim 1, characterized in that: The adjustable lower die (6) is used to support the metal plate and can be fine-tuned according to the actual central axis of the centering nozzle (5) so that the axis of the adjustable lower die (6) coincides with the axis of the centering nozzle (5).

6. The self-piercing riveting device with automatic nail feeding according to claim 1, characterized in that: The riveting pressure rod (4) is driven by a servo motor to move up and down.

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