A riveting head device dedicated to a hollow pin shaft chain

Abstract

The present application relates to the field of chain processing, and specifically discloses a riveting head device special for hollow pin shaft chain. The riveting head device at least comprises a rack, a feeding assembly and a riveting head assembly. The rack is provided with a workbench, and the workbench is provided with an assembly channel. The feeding assembly is used to drive the directional movement of the hollow pin shaft chain in the assembly channel. The riveting head assembly comprises a riveting head upper die, a riveting head lower die and a power unit. The power unit is used to drive the up-and-down movement of the riveting head upper die relative to the riveting head lower die. The riveting head upper die and the riveting head lower die respectively comprise a riveting head nail. The forming end of the riveting head nail is provided with a forming surface. The forming surface is discontinuously arranged along the circumferential direction of the riveting head nail, and a deformation zone is formed inwardly at the discontinuous position. The riveting head device discontinuously forms the deformation zone on the forming surface, guides the deformation of the hollow pin shaft during the riveting process, avoids the processing defects caused by the single-time excessive deformation of the hollow pin shaft, and improves the qualified rate of the product.

Description

Technical Field

[0001] This invention relates to the field of chain processing, and more particularly to a riveting head device specifically for hollow pin chains. Background Technology

[0002] Chain drives are a common type of transmission in the mechanical field, offering advantages such as accurate transmission ratios, reliable operation, and high power transmission. Hollow pin chains are one of the most commonly used chain types, offering advantages such as light weight and material savings, and are widely used in the automotive industry.

[0003] The structure of the hollow pin chain is basically the same as that of the conventional connection, including inner links, outer links, and pins. The pins are hollow, and the two inner links are connected by the outer links and the pins. The pins are connected by rivets.

[0004] However, using conventional riveting heads for hollow pins often results in problems such as pin breakage, shrinkage, bending, and insufficient riveting head, leading to unstable product quality and reduced processing efficiency. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a riveting head device for hollow pin chains. By breaking the forming surface to form a deformation zone, the hollow pin is guided to deform during the riveting process, avoiding processing defects caused by excessive deformation of the hollow pin in a single operation, and improving the product qualification rate.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a riveting head device specifically for hollow pin chains, comprising at least,

[0007] A frame, wherein a workbench is provided on the frame and an assembly channel is provided on the workbench;

[0008] A feeding assembly, wherein the feeding assembly is used to drive the hollow pin chain to move in a directional manner within the assembly channel;

[0009] A rivet head assembly, comprising an upper rivet head die, a lower rivet head die, and a power unit, wherein the upper rivet head die and the lower rivet head die are arranged opposite each other, the assembly channel is arranged between the upper rivet head die and the lower rivet head die, and the power unit is used to drive the upper rivet head die to move up and down relative to the lower rivet head die.

[0010] The upper and lower rivet molds each include a rivet head, and the forming end of the rivet head is provided with a forming surface. The forming surface is broken along the circumferential direction of the rivet head and a deformation zone is formed inward at the break.

[0011] During the riveting process, the inner link is connected in series with the outer link plate and the hollow pin, and then placed into the assembly channel along the extension direction of the assembly channel. Driven by the feeding component, it moves intermittently in one direction within the assembly channel to achieve automated feeding.

[0012] When the hollow pin moves between the upper and lower rivet molds, the power unit drives the upper rivet mold to move downwards, and with the cooperation of the lower rivet mold, performs riveting operation at both ends of the hollow pin in the form of enlarging holes, thereby realizing the riveting of the hollow pin.

[0013] Because the forming surface is broken in the circumferential direction, when performing internal expansion riveting on the hollow pin, the degree of deformation of the hollow pin is different on the forming surface and the deformation zone. Specifically, the deformation amount of the area corresponding to the deformation zone is less than the deformation amount of the area corresponding to the forming surface. This can effectively reduce the single deformation amount of the hollow pin while ensuring sufficient riveting head quantity, thereby reducing the probability of defects such as breakage of the hollow pin and improving the forming quality of the product.

[0014] Preferably, a tensioning unit is provided in the assembly channel, and the tensioning unit is located near the entrance end of the assembly channel; the tensioning unit includes an elastic block disposed inside the assembly channel.

[0015] The tensioning unit works in conjunction with the feeding assembly to create tension between the feeding assembly and the tensioning unit, ensuring precise feeding and positioning of the chain in the rivet assembly area.

[0016] Preferably, the feeding assembly includes a feeding toothed plate, a transverse feed drive unit and a longitudinal feed drive unit, wherein the feeding toothed plate is located on one side of the assembly channel and the contour teeth of the feeding toothed plate are arranged facing the assembly channel.

[0017] The lateral feed drive unit is used to drive the feeding toothed plate to move perpendicular to the extension direction of the assembly channel, and the longitudinal feed drive unit is used to drive the feeding toothed plate to move along the extension direction of the assembly channel.

[0018] Preferably, the feeding assembly further includes a mounting plate, on which a first guide rail is provided. The first guide rail is arranged perpendicular to the extension direction of the assembly channel. The feeding toothed plate is arranged on the mounting plate and connected to the first guide rail. The transverse feed drive unit is arranged on the mounting plate.

[0019] The worktable is provided with a second guide rail, which is arranged along the extension direction of the assembly channel. The mounting plate is connected to the second guide rail, and the longitudinal feed drive unit is arranged on the worktable.

[0020] Preferably, an auxiliary unloading component is also included, which is disposed at the bottom of the assembly channel;

[0021] The auxiliary unloading assembly includes a fixed plate and a movable plate. The movable plate is positioned above the fixed plate, and an elastic element is provided between the fixed plate and the movable plate. The movable plate is provided with rivet head through holes corresponding to rivet head pins, and the rivet head pins of the lower rivet head die pass through the rivet head through holes.

[0022] The movable plate has at least two position states relative to the fixed plate. In the first position state, the formed end of the corresponding rivet protrudes from the upper surface of the movable plate, and at this time the upper surface of the movable plate is not higher than the bottom surface of the assembly channel.

[0023] In the second position, the formed end of the corresponding rivet head retracts into the rivet head through hole, and at this time the upper surface of the movable plate is not lower than the bottom surface of the assembly channel.

[0024] During riveting, the upper die of the riveting head presses down, pushing the hollow pin shaft downwards and causing the movable plate to move downwards against the elastic force of the elastic element until the rivet head pins of the lower die of the riveting head extend. Both rivet head pins simultaneously act on the hollow pin shaft, completing the riveting operation. After riveting is complete, the elastic element resets, pushing the hollow pin shaft and rivet head pins apart via the movable plate. This prevents the rivet head pins from interfering with the chain feeding, ensuring the normal operation of the feeding assembly and facilitating continuous riveting.

[0025] Preferably, the deformation zone is provided with a limiting surface, which is a curved surface or a plane, and the inclination angle of the limiting surface relative to the rivet axis is smaller than the inclination angle of the forming surface relative to the rivet.

[0026] During the internal expansion extrusion process of the forming surface on the hollow pin, the limiting surface plays a guiding and restricting role in the deformation of the hollow pin, ensuring that the degree of deformation is controlled on the basis of pre-deformation in the corresponding area, the final parallel effect of the hollow pin is predictable, and the forming quality and connection effect of the rivet head are controllable.

[0027] Preferably, the deformation zone is a groove.

[0028] Preferably, the number of rivets is at least two groups, and they are distributed sequentially in the extension direction of the assembly channel; the orientation of the broken area of ​​the forming surface on different groups of rivets is different.

[0029] By using two sets of rivet heads, each hollow pin is riveted twice, reducing the difference in connection performance of the hollow pin in each direction after riveting.

[0030] Preferably, the number of rivets is a set, and the shaped surface segment on each rivet is divided into at least three shaped segments, and each shaped segment is evenly distributed in a ring around the axis of the rivet.

[0031] It takes into account both the degree of deformation of the hollow pin and the connection effect of the hollow pin after riveting.

[0032] Preferably, the number of rivets is a set, and the forming surface of each rivet is divided into at least two forming segments, and each forming segment is evenly distributed in a ring around the axis of the rivet.

[0033] The rivet assembly also includes a steering drive unit, which corresponds one-to-one with the rivet head and is used to drive the rivet head to rotate around the axis.

[0034] The chain feeds once, and the power unit works twice. Through the rotation of the rivet head, each hollow pin is riveted twice, reducing the difference in the connection performance of the hollow pin in each direction after riveting. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the riveting head device specifically designed for hollow pin chains in this embodiment;

[0036] Figure 2 This is a top view of the riveting head device specifically designed for hollow pin chains in this embodiment;

[0037] Figure 3 This is a schematic diagram of the structure of the riveting head upper die and the riveting head lower die in the riveting head device for hollow pin chain according to the third embodiment of the present invention;

[0038] Figure 4 This is a schematic diagram of the auxiliary unloading assembly in the riveting head device for hollow pin chains according to the third embodiment of the present invention;

[0039] Figure 5 This is a schematic diagram of the riveting head mold in the riveting head device for hollow pin chains according to the third embodiment of the present invention;

[0040] Figure 6 This is a schematic diagram of the rivet head in the riveting head device for hollow pin chains in this embodiment;

[0041] Figure 7 This is a front view of the rivet forming end in the rivet head device specifically designed for hollow pin chains in this embodiment;

[0042] Figure 8 for Figure 7 Sectional view along line AA;

[0043] Figure 9 This is a cross-sectional view of the first type of forming end of the rivet head in the rivet head equipment for hollow pin chains in this embodiment;

[0044] Figure 10 This is a cross-sectional view of the second type of forming end of the rivet in the riveting head device for hollow pin chains in this embodiment;

[0045] Figure 11This is a cross-sectional view of the third type of forming end of the rivet in the rivet head device for hollow pin chains in this embodiment. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0047] Example 1

[0048] like Figure 1 and Figure 2 As shown, a riveting head device for hollow pin chains includes at least a frame, a feeding assembly 5, and a riveting head assembly. The frame has a worktable 1, and the worktable 1 has an assembly channel 3. A tensioning unit 4 is provided within the assembly channel 3, positioned near the entrance end of the assembly channel 3. The tensioning unit 4 includes an elastic block disposed inside the assembly channel 3. The tensioning unit 4 cooperates with the feeding assembly 5 to create tension between them, ensuring precise feeding and positioning of the chain within the riveting head assembly area.

[0049] Among them, such as Figure 2 As shown, the feeding assembly 5 is used to drive the hollow pin chain to move in a specific direction within the assembly channel 3. Specifically, the feeding assembly 5 includes a feeding toothed plate 56, a transverse feed drive unit 53, and a longitudinal feed drive unit 51. The feeding toothed plate 56 is located on one side of the assembly channel 3, and the contoured teeth of the feeding toothed plate 56 are oriented towards the assembly channel 3. The transverse feed drive unit 53 is used to drive the feeding toothed plate 56 to move perpendicular to the extension direction of the assembly channel 3, and the longitudinal feed drive unit 51 is used to drive the feeding toothed plate 56 to move along the extension direction of the assembly channel 3.

[0050] like Figure 2 As shown, the feeding assembly 5 further includes a mounting plate 54, on which a first guide rail 52 is provided. The first guide rail 52 is arranged perpendicular to the extension direction of the assembly channel 3. The feeding toothed plate 56 is disposed on the mounting plate 54 and connected to the first guide rail 52. The transverse feed drive unit 53 is disposed on the mounting plate 54. The worktable 1 is provided with a second guide rail 55, which is arranged along the extension direction of the assembly channel 3. The mounting plate 54 is connected to the second guide rail 55. The longitudinal feed drive unit 51 is disposed on the worktable 1. The transverse feed drive unit 53 is a pneumatic cylinder, an electric cylinder, or a hydraulic cylinder, and the longitudinal feed drive unit 51 is a pneumatic cylinder, an electric cylinder, or a hydraulic cylinder.

[0051] Among them, such as Figure 1 and Figure 3 As shown, the riveting head assembly includes an upper riveting mold 2, a lower riveting mold 7, and a power unit. The upper riveting mold 2 and the lower riveting mold 7 are arranged vertically opposite each other. The assembly channel 3 is located between the upper riveting mold 2 and the lower riveting mold 7. The power unit is used to drive the upper riveting mold 2 to move vertically relative to the lower riveting mold 7. The power unit is a hydraulic cylinder or a pneumatic cylinder.

[0052] like Figure 3 and Figure 5 As shown, the upper rivet mold 2 and the lower rivet mold 7 each include a rivet 21. The forming end of the rivet 21 is provided with a forming surface 211. The forming surface 211 is broken along the circumferential direction of the rivet 21 and a deformation zone is formed inward at the break.

[0053] During the riveting process, the inner link is connected in series with the outer link plate and the hollow pin, and then placed into the assembly channel 3 along the extension direction of the assembly channel 3. Under the drive of the feeding component 5, it moves intermittently in one direction within the assembly channel 3 to achieve automated feeding.

[0054] When the hollow pin moves between the upper die 2 and the lower die 7, the power unit drives the upper die 2 to move downwards, and with the cooperation of the lower die 7, the hollow pin is riveted by expanding the holes at both ends to achieve the riveting of the hollow pin.

[0055] Because the forming surface 211 is broken in the circumferential direction, when performing the internal expansion riveting operation on the hollow pin, the hollow pin has different degrees of deformation on the forming surface 211 and the deformation zone. Specifically, the deformation amount of the area corresponding to the deformation zone is less than the deformation amount of the area corresponding to the forming surface 211. This can effectively reduce the single deformation amount of the hollow pin while ensuring sufficient riveting head quantity, thereby reducing the probability of defects such as breakage of the hollow pin and improving the forming quality of the product.

[0056] As a specific implementation method, such as Figure 11 As shown, the deformation zone is groove 213.

[0057] As another specific implementation method, such as Figures 6-10 As shown, the deformation zone is provided with a limiting surface 212, which is a curved surface or a plane. The inclination angle of the limiting surface 212 relative to the axis of the rivet 21 is smaller than the inclination angle of the forming surface 211 relative to the rivet 21. Figure 8As shown, α is the inclination angle of the forming surface 211 relative to the rivet 21, and β is the inclination angle of the limiting surface 212 relative to the axis of the rivet 21. During the internal expansion extrusion process of the hollow pin by the forming surface 211, the limiting surface 212 guides and restricts the deformation of the hollow pin, ensuring that the degree of deformation is controlled in the corresponding area with pre-deformation, the final parallel effect of the hollow pin is predictable, and the forming quality and connection effect of the rivet are controllable.

[0058] As a specific implementation method, such as Figure 10 As shown, the number of rivets 21 is a set, and the forming surface 211 on each rivet 21 is divided into at least three forming segments, and each forming segment is evenly distributed in a ring around the axis of the rivet 21. This takes into account both the control of the deformation degree of the hollow pin and the connection effect of the hollow pin after riveting.

[0059] Furthermore, such as Figure 3 and Figure 4 As shown, it also includes an auxiliary unloading assembly 6, which is disposed at the bottom of the assembly channel 3. The auxiliary unloading assembly 6 includes a fixed plate 63 and a movable plate 61. The movable plate 61 is disposed above the fixed plate 63, and an elastic element 62 is provided between the fixed plate 63 and the movable plate 61. The movable plate 61 is provided with rivet head through holes corresponding one-to-one with the rivet head 21, and the rivet head 21 of the lower rivet head mold 7 passes through the rivet head through holes.

[0060] The movable plate 61 has at least two position states relative to the fixed plate 63. In the first position state, the forming end of the corresponding rivet 21 extends out from the upper surface of the movable plate 61, and the upper surface of the movable plate 61 is not higher than the bottom surface of the assembly channel 3. In the second position state, the forming end of the corresponding rivet 21 retracts into the rivet through hole, and the upper surface of the movable plate 61 is not lower than the bottom surface of the assembly channel 3.

[0061] During riveting, the upper die 2 of the riveting head presses down, pushing the hollow pin shaft downwards and causing the movable plate 61 to move downwards against the elastic force of the elastic element 62, until the rivet 21 of the lower die 7 of the riveting head extends. The two rivet 21 simultaneously act on the hollow pin shaft, completing the riveting operation. After riveting is completed, the elastic element 62 resets and pushes the hollow pin shaft and rivet 21 apart via the movable plate 61, avoiding interference from the rivet 21 on the chain feeding, ensuring the normal operation of the feeding assembly 5, and facilitating the continuous riveting process.

[0062] Example 2

[0063] Compared to Embodiment 1, the difference in this embodiment is that the number of rivet 21s is a group, and the forming surface 211 on each rivet 21 is divided into at least two forming segments, and each forming segment is evenly distributed in a ring around the axis of the rivet 21. The rivet assembly also includes a steering drive unit, which corresponds one-to-one with the rivet 21 and is used to drive the rivet 21 to rotate around the axis. With a single chain feed, the power unit operates twice, performing two riveting operations on each hollow pin through the rotational movement of the rivet 21, reducing the difference in the upward connection performance of the hollow pins after riveting.

[0064] Example 3

[0065] Compared with Example 1, such as Figures 3-6 As shown, the difference in this embodiment is that the number of rivets 21 is at least two sets, and they are distributed sequentially in the extension direction of the assembly channel 3. The orientation of the disconnected areas of the forming surface 211 on different sets of rivets 21 is different.

[0066] By using two sets of rivet 21, each hollow pin is riveted twice, reducing the difference in connection performance of the hollow pin in each direction after riveting.

[0067] In summary, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A riveting head device specifically for hollow pin chains, characterized in that, At least including: A frame, wherein a workbench is provided on the frame and an assembly channel is provided on the workbench; A feeding assembly, wherein the feeding assembly is used to drive the hollow pin chain to move in a directional manner within the assembly channel; A rivet head assembly, comprising an upper rivet head die, a lower rivet head die, and a power unit, wherein the upper rivet head die and the lower rivet head die are arranged opposite each other, the assembly channel is arranged between the upper rivet head die and the lower rivet head die, and the power unit is used to drive the upper rivet head die to move up and down relative to the lower rivet head die. The upper and lower rivet molds each include a rivet head, and the forming end of the rivet head is provided with a forming surface. The forming surface is broken along the circumferential direction of the rivet head, and a deformation zone is formed inward at the break.

2. The riveting head device according to claim 1, characterized in that: The assembly channel is equipped with a tensioning unit, which is located near the entrance end of the assembly channel; the tensioning unit includes an elastic block disposed inside the assembly channel.

3. The riveting head device according to claim 1, characterized in that: The feeding assembly includes a feeding toothed plate, a transverse feed drive unit and a longitudinal feed drive unit. The feeding toothed plate is located on one side of the assembly channel, and the contour teeth of the feeding toothed plate are arranged facing the assembly channel. The lateral feed drive unit is used to drive the feeding toothed plate to move perpendicular to the extension direction of the assembly channel, and the longitudinal feed drive unit is used to drive the feeding toothed plate to move along the extension direction of the assembly channel.

4. The riveting head device according to claim 3, characterized in that: The feeding assembly also includes a mounting plate, on which a first guide rail is provided. The first guide rail is arranged perpendicular to the extension direction of the assembly channel. The feeding toothed plate is arranged on the mounting plate and connected to the first guide rail. The transverse feed drive unit is arranged on the mounting plate. The worktable is provided with a second guide rail, which is arranged along the extension direction of the assembly channel. The mounting plate is connected to the second guide rail, and the longitudinal feed drive unit is arranged on the worktable.

5. The riveting head device according to claim 1, characterized in that: It also includes an auxiliary unloading component, which is located at the bottom of the assembly channel; The auxiliary unloading assembly includes a fixed plate and a movable plate. The movable plate is positioned above the fixed plate, and an elastic element is provided between the fixed plate and the movable plate. The movable plate is provided with rivet head through holes corresponding to rivet head pins, and the rivet head pins of the lower rivet head die pass through the rivet head through holes. The movable plate has at least two position states relative to the fixed plate. In the first position state, the formed end of the corresponding rivet protrudes from the upper surface of the movable plate, and at this time the upper surface of the movable plate is not higher than the bottom surface of the assembly channel. In the second position, the formed end of the corresponding rivet head retracts into the rivet head through hole, and at this time the upper surface of the movable plate is not lower than the bottom surface of the assembly channel.

6. The riveting head device according to claim 1, characterized in that: The deformation zone is provided with a limiting surface, which is a curved surface or a plane. The inclination angle of the limiting surface relative to the rivet axis is smaller than the inclination angle of the forming surface relative to the rivet.

7. The riveting head device according to claim 1, characterized in that: The deformation zone is a groove.

8. The riveting head device according to any one of claims 1-7, characterized in that: The number of rivets is at least two groups, and they are distributed sequentially in the extension direction of the assembly channel; the orientation of the broken area of ​​the forming surface on different groups of rivets is different.

9. The riveting head device according to any one of claims 1-7, characterized in that: The number of rivets is a set, and the forming surface of each rivet is broken into at least three forming segments, and each forming segment is evenly distributed in a ring around the axis of the rivet.

10. The riveting head device according to any one of claims 1-7, characterized in that: The number of rivets is a set, and the forming surface of each rivet is broken into at least two forming segments, and each forming segment is evenly distributed in a ring around the axis of the rivet. The rivet assembly also includes a steering drive unit, which corresponds one-to-one with the rivet head and is used to drive the rivet head to rotate around the axis.

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