Self-piercing rivet gun head

Abstract

This utility model discloses a self-piercing riveting gun head, including a gun head body, a riveting seat installed at its tail, and a riveting head installed in the central hole of the riveting seat. The gun head body has a pry block assembly, a ratchet assembly installed in the central cavity of the pry block assembly via a pin, and a roller top post assembly with its bottom abutting against the pry block assembly. The gun head body has inclined spring grooves on both sides, each containing a spring. The two ends of the springs are connected to the pry block assembly and the gun head body respectively via pins. The gun head body, the riveting seat, and the riveting head all have vertically penetrating punch holes in their centers, allowing the punch to move up and down within them. The length of the punch hole ranges from 38 to 58 cm. The height of the gun head body, the riveting seat, and the riveting head are all shortened, thereby shortening the length of the punch hole. The length and stroke of the punch itself can be shortened, resulting in a more compact overall structure and reduced damage to the punch.

Description

Technical Field

[0001] This utility model relates to the field of self-piercing riveting equipment technology, and in particular to a self-piercing riveting gun head. Background Technology

[0002] Self-piercing riveting is a cold joining technology used to join two or more metal sheets. The principle is that a specially designed rivet penetrates the top sheet, and under the action of the riveting die, the hollow structure at the tail of the rivet expands and penetrates without piercing the bottom sheet, thus forming a strong riveting point. The riveting gun head is a device installed at the bottom of the riveting gun, allowing the punch to move up and down and press the rivet into the sheet metal. The strip passes laterally through the self-piercing riveting gun head. To achieve automatic strip feeding, Chinese invention patent application number CN201510921706.6 discloses a fully automatic self-piercing riveting gun head, which includes a gun head mounting base, a paddle mounted inside the gun head mounting base, a ratchet mounted on the paddle, a rivet guide seat mounted on the gun head mounting base, a tension spring assembly, a rivet center positioning nozzle mounted on the rivet guide seat, and a pressing punch. The pressing punch sequentially passes through the gun head mounting base, the rivet guide seat, and the rivet center positioning nozzle, using the pressing power to complete the automatic feeding and pressing of the rivet. However, the overall height of this type of fully automatic material feeding and self-punching riveting gun head is relatively high. If the length of the punch itself and the stroke length are long, it is prone to breakage and damage under long-term high-speed and high-pressure impact, resulting in high replacement costs. Utility Model Content

[0003] In response to the shortcomings of existing self-piercing riveting gun heads, such as high overall height and long internal punch length leading to punch breakage and damage, the applicant provides a self-piercing riveting gun head with a reasonable structure. By shortening the height of the gun head body, the rivet seat, and the rivet head, the length of the punch hole can be shortened, and the length and stroke of the punch itself can also be shortened, resulting in a more compact overall structure and reduced punch damage.

[0004] The technical solution adopted in this utility model and its beneficial effects are as follows:

[0005] A self-piercing riveting gun head includes a gun head body, a riveting seat installed at its tail, and a riveting head installed in the central hole of the riveting seat. The cavity in the middle of the gun head body has a pry block assembly, a ratchet assembly installed in the central cavity of the pry block assembly by a pin, and a roller top post assembly at the bottom abutting against the pry block assembly. The gun head body has tension spring grooves with a certain angle on both sides, and tension springs are provided in the tension spring grooves. The two ends of the tension springs are respectively connected to the pry block assembly and the gun head body by pins. The gun head body, the riveting seat, and the riveting head all have vertically penetrating punch holes in the center, which allow the punch to move up and down within them. The length of the punch hole ranges from 38 to 58 cm.

[0006] The height of the gun head body, the rivet seat, and the rivet head are all shortened, thereby shortening the length of the punch hole. The length and stroke of the punch itself can be shortened, making the overall structure more compact and reducing damage to the punch. The ejector pin moves up and down in the punch hole, driving the roller ejector assembly to move up and down together. The roller ejector assembly can move the paddle assembly, which in turn drives the ratchet assembly to rotate. The ejector pin can align with the rivet hole on the material belt and press the rivet. When the ratchet teeth of the ratchet assembly engage with the next row of teeth, the material belt moves forward automatically.

[0007] As a further improvement to the above technical solution:

[0008] The top of the gun head body has several through-holes along the radial direction, into which fasteners are installed, allowing the self-piercing riveting gun head to be detachably connected to the riveting gun. Compared to the axially oriented gun head mounting holes in the prior art, the radially oriented gun head mounting holes of this invention make it easier for operators to tighten or unscrew bolts, facilitating assembly and disassembly.

[0009] The gun head body is generally rectangular in shape, the rivet base is cylindrical, and the rivet head has a "T" shaped cross-section. The rivet base is fitted around the outer periphery of the "T" shaped vertical part of the rivet head. The gun head body, rivet base, and rivet head have further shortened their height, which shortens the punch hole and reduces the distance of the punch itself and its movement stroke.

[0010] The rivet seat has several through rivet seat mounting holes along the axial direction, in which fasteners are installed, so that the rivet seat and the gun head body are detachably connected.

[0011] The riveting base has several through-holes for mounting the riveting heads along its radial direction. Each riveting head has an inclined limiting surface corresponding to one of these mounting holes. Fasteners are installed within these mounting holes, allowing for a detachable connection between the riveting head and the riveting base. The fasteners abut against the limiting surfaces to secure the riveting head. The riveting base and the gun head body, as well as the riveting head and the riveting base, are detachably connected, facilitating replacement of the riveting base and head by the operator. After prolonged use and wear or damage, the entire self-piercing riveting gun head does not need to be replaced, saving costs.

[0012] The angle range of the tension spring groove is 115-120°, the length range is 48-52mm, the wire diameter range is 0.9-1.2mm, and the outer diameter range is 5-7mm.

[0013] A side plate is fixed to the outside of the tension spring groove.

[0014] In this invention, due to the reduced height of the self-piercing riveting gun head, the opening angle of the tension spring groove is more inclined compared to the prior art, and the distance from the top of the tension spring groove to the top edge of the gun head body is further shortened. To ensure the spring's tension and rebound performance, the spring wire diameter and outer diameter are larger. Two side plates are fixed to the outside of the tension spring groove to prevent the tension spring from coming out of the groove.

[0015] The ratchet assembly has a steel ball travel groove on the inside, and ratchet teeth are evenly arranged on the circumference of the wheel disc of the ratchet assembly.

[0016] The ratchet teeth of the ratchet assembly are semi-circular with slightly pointed heads. The length of the root of the ratchet tooth ranges from 3.5 to 5.5 mm, and the thickness ranges from 1.2 to 2 mm. The length of the head of the ratchet tooth ranges from 2 to 3 mm, and the thickness ranges from 0.4 to 1 mm. Increasing the size of the ratchet teeth can extend the service life of the ratchet assembly.

[0017] The front side of the paddle assembly has a ball bearing mounting plate, and a groove is opened on the inner side of the plate, near the ratchet assembly. A steel ball spring is horizontally arranged in the groove, and steel balls are arranged at both ends of the spring. The steel balls are pressed onto the steel ball walking groove by the steel ball spring, and the steel balls can move in the steel ball walking groove, thereby pushing the ratchet assembly to rotate.

[0018] As the punch moves downward, the roller top column assembly causes the shifting block assembly to rotate. The steel balls, driven by the steel ball spring, move synchronously to the previous steel ball travel groove. When the punch returns to its original position, the tension spring pulls the shifting block assembly to rotate in the opposite direction, the roller top column assembly returns to its original position, and the steel balls are stuck at the bottom of the steel ball travel groove. The shifting block assembly pushes the ratchet assembly to rotate in the opposite direction through the steel balls. The ratchet assembly then engages with the next row of teeth on the conveyor belt, thus enabling the conveyor belt to be automatically transported forward. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model.

[0020] Figure 2 This is a top view of the present invention.

[0021] Figure 3 This is a schematic diagram of the structure of this utility model without side plates.

[0022] Figure 4 This is a structural diagram of the tension spring, ratchet assembly, toggle block assembly, and roller top post assembly.

[0023] Figure 5 This is a structural diagram of the tension spring, ratchet assembly, and roller top post assembly.

[0024] Figure 6 This is a schematic diagram of the press-fit seat.

[0025] In the diagram: 1. Gun head body; 11. Cavity; 12. Roller top post mounting hole; 13. Gun head mounting hole; 14. Tension spring groove; 2. Riveting seat; 21. Riveting seat mounting hole; 22. Riveting head mounting hole; 3. Riveting head; 31. Limiting surface; 4. Side plate; 5. Punch hole; 6. Tension spring; 7. Ratchet assembly; 71. Ratchet tooth; 72. Steel ball travel groove; 8. Pulley assembly; 81. Ball travel mounting plate; 82. Steel ball spring; 83. Steel ball; 9. Roller top post assembly. Detailed Implementation

[0026] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0027] like Figure 1 , 2 As shown, the self-piercing riveting gun head of this utility model is installed at the bottom of the riveting gun, including a gun head body 1, a riveting seat 2 installed at its tail, and a riveting head 3 installed in the central hole of the riveting seat 2. Figure 1 , 4 As shown in Figure 5, the cavity 11 of the gun head body 1 has a lever assembly 8, a ratchet assembly 7 mounted in the central cavity of the lever assembly 8 via a pin, and two roller top post assemblies 9 at the bottom abutting against the lever assembly 8. The roller top post assemblies 9 pass through two roller top post mounting holes 12 opened at the top of the gun head body 1 and can move up and down within them. When the roller top post assemblies 9 move up and down, they can push the lever assembly 8 to rotate, and the lever assembly 8 drives the ratchet assembly 7 to rotate. The material strip (not shown in the figure) is located between the ratchet assembly 7 and the rivet seat 2. The material belt has two rows of rectangular teeth on the left and right sides and a row of circular rivet holes in the center. The teeth and rivet holes are evenly arranged along the length of the material belt. Rivets are inserted into the rivet holes. The ratchet assembly 7 has ratchet teeth 71 evenly arranged on the circumference of the wheel disc. Two teeth in the same row are installed on the ratchet teeth 71. The rivet holes in the same row as the teeth are concentric with the punch holes 5, so that the ejector pin can be aligned with the rivet holes and press the rivet. When the ratchet teeth 71 are engaged in the next row of teeth, the material belt moves forward automatically.

[0028] like Figure 1 , 2 As shown, the gun head body 1 is generally rectangular in shape. Three through-holes 13 are radially formed at the top of the gun head body 1, into which bolts are installed, allowing for detachable connection between the self-piercing riveting gun head and the riveting gun. Compared to the axially formed gun head mounting holes 13 in the prior art, the orientation of the gun head mounting holes 13 in this invention makes it easier for operators to tighten or unscrew the bolts, facilitating assembly and disassembly. Figure 6As shown, the rivet seat 2 is cylindrical, and the rivet head 3 has a "T" shaped cross section. The rivet seat 2 is fitted around the outer periphery of the vertical T-shaped part of the rivet head 3. The rivet seat 2 has two through rivet seat mounting holes 21 along the axial direction, in which bolts are installed, so that the rivet seat 2 and the gun head body 1 are detachably connected. The rivet seat 2 has a through rivet head mounting hole 22 along the radial direction, in which bolts are installed, so that the rivet head 3 and the rivet seat 2 are detachably connected. This makes it easy for operators to replace the rivet seat 2 and the rivet head 3. After long-term wear or damage, there is no need to replace the entire self-piercing riveting gun head, saving costs. The rivet head 3 is provided with an inclined limiting surface 31 corresponding to the rivet head mounting hole 22. The bolt abuts against the limiting surface 31 to limit and fix the rivet head 3. The gun head body 1, the rivet base 2, and the rivet head 3 all have vertically penetrating punch holes 5 in the center, allowing the punch (not shown in the figure) to move up and down within them. The punch holes 5 can also center the punch and ensure that it is aligned with the rivet. When the punch presses the rivet (not shown in the figure) on the material strip, the rivet head 3 plays the role of center point positioning, preventing the rivet from tilting and pressing into the sheet. The length range of the punch hole 5 (i.e. the stroke length range of the punch) is 38-58cm, and in this embodiment it is 55cm. Compared with the prior art, the height of the gun head body 1, the rivet base 2, and the rivet head 3 are all shortened, which in turn shortens the length of the punch hole 5, the length of the punch itself, and the stroke length. This results in better stability during operation and prevents the punch from breaking or being damaged due to long-term high-speed and high-pressure impact.

[0029] like Figure 3 As shown, the gun head body 1 has inclined spring grooves 14 on both sides, with an angle ranging from 115° to 120°. The length of the spring grooves 14 ranges from 48 to 52 mm, and is 50 mm in this embodiment. A spring 6 is located within the spring groove 14. The two ends of the spring 6 are connected to the lever assembly 8 and the gun head body 1 respectively via pins. The wire diameter of the spring 6 ranges from 0.9 to 1.2 mm, and the outer diameter ranges from 5 to 7 mm. In this embodiment, the wire diameter of the spring 6 is 1 mm, and the outer diameter is 6 mm. Due to the shortened height of the self-piercing riveted gun head, the opening angle of the spring groove 14 is more inclined compared to the prior art, and the distance from the top of the spring groove 14 to the top edge of the gun head body 1 is further shortened. To ensure the tension and rebound performance of the spring 6, the wire diameter and outer diameter of the spring 6 are larger. Two side plates 4 are fixed to the outside of the spring groove 14 to prevent the spring 6 from detaching from the spring groove 14.

[0030] like Figure 4 , 5As shown, the ratchet teeth 71 of the ratchet assembly 7 are semi-circular with slightly pointed heads. The length of the root of the ratchet teeth 71 ranges from 3.5 to 5.5 mm and the thickness ranges from 1.2 to 2 mm. The length of the head of the ratchet teeth 71 ranges from 2 to 3 mm and the thickness ranges from 0.4 to 1 mm. In this embodiment, the length of the root of the ratchet teeth 71 is 4.5 mm and the thickness is 1.4 mm, and the length of the head of the ratchet teeth 71 is 2.5 mm and the thickness is 0.8 mm. Increasing the size of the ratchet teeth 71 can extend the service life of the ratchet assembly 7. The ratchet assembly 7 has a ball bearing groove 72 on its inner side. The front side of the paddle assembly 8 has a ball bearing mounting plate 81. A groove (not shown in the figure) is opened on the inner side of the plate, near the ratchet assembly 7. A ball bearing spring 82 is horizontally arranged in the groove. The two ends of the spring press two ball bearings 83 onto the ball bearing groove 72. The ball bearings 83 can move in the ball bearing groove 72, thereby pushing the ratchet assembly 7 to rotate.

[0031] In actual operation, the punch penetrates downwards through the entire punch hole 5 and the rivet hole on the material strip during riveting, pressing the rivet into the sheet metal. At this time, the roller top post assembly 9 is pushed downwards by the punch, and the roller top post assembly 9 causes the dial block assembly 8 to rotate. The two steel balls 83 move synchronously to the next steel ball travel groove 72 under the drive of the steel ball spring 82. When the punch returns to its original position, the tension spring 6 pulls the dial block assembly 8 to rotate in the opposite direction, the roller top post assembly 9 returns to its original position, and the steel balls 83 are stuck at the bottom of the steel ball travel groove 72. The dial block assembly 8 pushes the ratchet assembly 7 to rotate in the opposite direction through the steel balls 83. The ratchet assembly 7 is engaged in the next row of teeth of the material strip, realizing the forward transport of the material strip, thereby transmitting the next rivet.

[0032] The above description is an explanation of the present utility model and not a limitation thereof. The present utility model can be modified in any form without departing from its spirit.

Claims

1. A self-piercing riveting gun head, comprising a gun head body (1), a riveting seat (2) installed at its tail, and a riveting head (3) installed in the central hole of the riveting seat (2), wherein the cavity (11) in the middle of the gun head body (1) has a pry block assembly (8), a ratchet assembly (7) installed in the central cavity of the pry block assembly (8) by a pin, and a roller top post assembly (9) whose bottom abuts against the pry block assembly (8), and tension spring grooves (14) with a certain angle are opened on both sides of the gun head body (1), and tension springs (6) are provided in the tension spring grooves (14), the two ends of the tension springs (6) being connected to the pry block assembly (8) and the gun head body (1) respectively by pins, characterized in that: The gun head body (1), the rivet seat (2) and the rivet head (3) all have vertical through punch holes (5) in the center, which allow the punch to move up and down inside. The length of the punch hole (5) ranges from 38 to 58 cm.

2. The self-piercing riveting gun head according to claim 1, characterized in that: The top of the gun head body (1) has several through gun head mounting holes (13) along the radial direction, in which fasteners are installed so that the self-piercing riveting gun head and the riveting gun can be detachably connected.

3. The self-piercing riveting gun head according to claim 1, characterized in that: The gun head body (1) is rectangular in shape, the rivet seat (2) is cylindrical, the rivet head (3) has a "T" shaped cross section, and the rivet seat (2) is fitted around the outer periphery of the "T" shaped vertical part of the rivet head (3).

4. The self-piercing riveting gun head according to claim 1, characterized in that: The rivet seat (2) has several through rivet seat mounting holes (21) along the axial direction, and fasteners are installed in them so that the rivet seat (2) and the gun head body (1) are detachably connected.

5. The self-piercing riveting gun head according to claim 1, characterized in that: The rivet base (2) has several through rivet head mounting holes (22) in the radial direction. The rivet head (3) is provided with an inclined limiting surface (31) corresponding to the rivet head mounting hole (22). Fasteners are installed in the rivet head mounting hole (22), so that the rivet head (3) and the rivet base (2) are detachably connected. The fasteners abut against the limiting surface (31) to limit and fix the rivet head (3).

6. The self-piercing riveting gun head according to claim 1, characterized in that: The angle range of the tension spring groove (14) is 115-120° and the length range is 48-52mm. The wire diameter range of the tension spring (6) is 0.9-1.2mm and the outer diameter range is 5-7mm.

7. The self-piercing riveting gun head according to claim 6, characterized in that: A side plate (4) is fixed to the outside of the tension spring groove (14).

8. The self-piercing riveting gun head according to claim 1, characterized in that: The ratchet assembly (7) has a steel ball travel groove (72) on the inner side, and ratchet teeth (71) are evenly arranged on the circumference of the wheel disc of the ratchet assembly (7).

9. The self-piercing riveting gun head according to claim 8, characterized in that: The ratchet (71) of the ratchet assembly (7) is a semi-circular tooth with a slightly pointed head. The length of the root of the ratchet (71) ranges from 3.5 to 5.5 mm and the thickness ranges from 1.2 to 2 mm. The length of the head of the ratchet (71) ranges from 2 to 3 mm and the thickness ranges from 0.4 to 1 mm.

10. The self-piercing riveting gun head according to claim 8, characterized in that: The front side of the paddle assembly (8) has a ball bearing mounting plate (81), and a groove is opened on the inner side of the plate, near the ratchet assembly (7). A steel ball spring (82) is arranged horizontally in the groove, and steel balls (83) are arranged at both ends of the spring. The steel balls (83) are pressed onto the steel ball walking groove (72) by the steel ball spring (82). The steel balls (83) can move in the steel ball walking groove (72), thereby pushing the ratchet assembly (7) to rotate.

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