Punching device for riveting holes of pull rings of zip-top cans

Abstract

The utility model discloses a ring-pull can pull ring rivet hole punching device which comprises a rivet hole upper cutter body and a rivet hole lower cutter body, the rivet hole upper cutter body and the rivet hole lower cutter body move relatively, and the lower end of the rivet hole upper cutter body is provided with a punching section. The upper end face of the rivet hole lower cutter body is provided with a forming hole for the punching section to stretch in, and the outer diameter of the punching section is slightly smaller than the inner diameter of the forming hole. At least one protruding punching part protruding out of the outer circumferential face of the punching section is arranged on the outer circumferential face of the punching section. The inner peripheral wall of an upper opening of the forming hole is at least provided with a sunken part sunken towards the inner wall of the forming hole; and the outline of the outer peripheral surface of the convex punching part is slightly smaller than that of the inner peripheral surface of the concave part. According to the riveting hole punching device, a corresponding notch can be formed in the inner wall of a riveting hole when the riveting hole is punched and formed, and the punching quality of the riveting hole is enhanced through the cooperation of the riveting hole upper cutter body and the riveting hole lower cutter body.

Description

TECHNICAL FIELD

[0001] The utility model relates to easy -open can technical field, concretely relates to an easy -open can pull ring riveting hole punching device. BACKGROUND

[0002] At present, the pull ring on the easy -open cover is riveted on the easy -open cover through rivets, the rivet hole on the pull ring usually adopts a circular hole, and the pull ring is riveted in the rivet hole, so that the pull ring and the easy -open cover are relatively fixed;The existing rivet hole punching device generally comprises a riveting hole punch, and the riveting hole punch is matched with the punch base to realize the punching and forming of the pull ring riveting hole;When the riveting hole punch goes down, it is matched with the punch base to punch the easy -open can pull ring to form a circular riveting hole on the easy -open can pull ring.

[0003] But in order to enhance the stability in the opening process of the pull ring, the bonding surface between the riveting hole and the rivet can be changed to reduce the possibility of rotating around the rivet in the opening process of the pull ring;Based on the punching and forming of the riveting hole, a new punching device needs to be researched to meet the formation of the riveting hole. UTILITY MODEL CONTENTS

[0004] In view of the above problems, the utility model aims at providing an easy -open can pull ring riveting hole punching device capable of forming a groove on the inner wall of the riveting hole.

[0005] The technical scheme of the utility model is as follows

[0006] The easy -open can pull ring riveting hole punching device comprises an upper riveting hole cutter body and a lower riveting hole cutter body, the upper riveting hole cutter body and the lower riveting hole cutter body form relative motion, and the lower end of the upper riveting hole cutter body is provided with a punching section;

[0007] The upper end face of the lower riveting hole cutter body is provided with a forming hole for the punching section to extend into, and the outer diameter of the punching section is slightly smaller than the inner diameter of the forming hole;

[0008] The outer peripheral surface of the punching section is provided with at least one convex punching part protruding from the outer peripheral surface of the punching section;

[0009] The upper opening inner peripheral wall of the forming hole is provided with at least one recessed part recessed towards the inner wall of the forming hole;

[0010] The outer peripheral surface profile of the convex punching part is slightly smaller than the inner peripheral surface profile of the recessed part.

[0011] In a further embodiment of the application: the arrangement depth of the recessed part along the inner wall of the forming hole is not less than the depth of the punching section inserted into the forming hole.

[0012] In a further embodiment of the application: the convex punching part is integrally formed on the outer peripheral surface of the punching section.

[0013] In further embodiments of the present application: the plurality of protruding punching sections are arranged in a spaced manner on the outer circumferential surface of the punching section.

[0014] In further embodiments of the present application: the plurality of protruding punching sections are arranged in a continuous manner on the outer circumferential surface of the punching section.

[0015] In further embodiments of the present application: the protruding punching section is a circular section smaller than a semicircle, and the center of the circular section is on the same circle when projected from top to bottom.

[0016] In further embodiments of the present application: the upper die body of the rivet hole is provided with an air inlet channel, the air inlet channel includes a gas guiding channel and a gas blowing channel, the gas guiding channel extends from the upper end surface of the upper die body of the rivet hole in the axial direction towards the lower part inside the upper die body of the rivet hole, and the gas blowing channel extends from the lower end surface of the upper die body of the rivet hole in the axial direction towards the middle part inside the upper die body of the rivet hole, and the gas guiding channel and the gas blowing channel are in communication; the inner diameter of the gas guiding channel is greater than the inner diameter of the gas blowing channel.

[0017] In further embodiments of the present application: the outer diameter of the punching section is smaller than the outer diameter of the middle part of the upper die body of the rivet hole, and the upper end outer circumferential wall of the punching section and the middle part outer wall of the upper die body of the rivet hole are connected by an arc-shaped transition surface; the length of the gas blowing channel is greater than the length of the punching section.

[0018] In further embodiments of the present application: the lower die body of the rivet hole extends in the axial direction from the lower end surface upwards, and the blanking channel in communication with the forming hole is a tapered channel gradually increasing from top to bottom, and the inner diameter of the small end of the blanking channel is equal to the inner diameter of the forming hole.

[0019] In further embodiments of the present application: the outer circumferences of the upper die body of the rivet hole and the lower die body of the rivet hole are respectively provided with positioning grooves.

[0020] With the above technical scheme, in the process of punching the rivet hole, due to the arrangement of the protruding punching section, a notch corresponding to the protruding punching section can be formed on the inner wall of the rivet hole, the notch penetrates the upper and lower surfaces of the pull ring body of the easy-open can, the protruding punching section can cooperate with the recess, that is, the protruding punching section enters the recess to punch the inner wall of the rivet hole and form the notch on the inner wall of the rivet hole to obtain the required rivet hole punching. The present application can obtain the corresponding notch on the inner wall of the rivet hole during the punching and forming of the rivet hole, and the cooperation of the upper die body of the rivet hole and the lower die body of the rivet hole can enhance the punching quality of the rivet hole. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 Fig. 2 is a structural schematic view of the upper die body of the rivet hole and the lower die body of the rivet hole in a separated state in the present application;

[0022] Figure 2The structure schematic diagram of the combined state of the rivet hole upper cutter body and the rivet hole lower cutter body in the utility model;

[0023] Figure 3 The first kind of structure schematic diagram of the rivet hole upper cutter body in the utility model is viewed from below;

[0024] Figure 4 The second kind of structure schematic diagram of the rivet hole upper cutter body in the utility model is viewed from below;

[0025] Figure 5 The third kind of structure schematic diagram of the rivet hole upper cutter body in the utility model is viewed from below;

[0026] Figure 6 The structure schematic diagram of the rivet hole lower cutter body in the utility model is viewed from above;

[0027] In the drawing, 10 is a rivet hole upper cutter body, 11 is a rivet hole lower cutter body, 12 is a punching section, 13 is a forming hole, 14 is a convex punching part, 15 is a recessed part, 16 is an air guiding channel, 17 is a blowing channel, 18 is an arc connecting surface, 19 is a blanking channel, 20 is a positioning groove, and 21 is an installation stage. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme of the embodiments of the utility model will be described clearly and completely in combination with the drawings of the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the described embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0029] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" in the specification and claims of the present application and their any variations intend to cover the non-exclusive inclusion.

[0030] In the present application, "embodiment" means that the specific features, structures or characteristics described in combination with the embodiment can be contained in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment that is not mutually exclusive with other embodiments.

[0031] Please refer to Figure 1The device is shown in Fig. 6, and the device is a punch cutting device for rivet hole of can tab, which comprises a cylindrical upper knife body 10 for rivet hole and a cylindrical lower knife body 11 for rivet hole. The upper knife body 10 for rivet hole is vertically arranged above the lower knife body 11 for rivet hole, and the lower knife body 11 for rivet hole is vertically arranged below the upper knife body 10 for rivet hole. After top-down projection, the axis of the upper knife body 10 for rivet hole and the axis of the lower knife body 11 for rivet hole are coincident, that is, the axis of the upper knife body 10 for rivet hole and the axis of the lower knife body 11 for rivet hole are on a straight line. The upper knife body 10 for rivet hole and the lower knife body 11 for rivet hole form relative motion, that is, the upper knife body 10 for rivet hole is fixedly assembled on an upper die plate capable of lifting and lowering, and the lower knife body 11 for rivet hole can be fixedly assembled on a lower die plate. The lower die plate can be set in a fixed form as required, so that the upper knife body 10 for rivet hole can form a motion of approaching and separating from the lower knife body 11 for rivet hole to realize a punch cutting action when the upper knife body 10 for rivet hole approaches the lower knife body 11 for rivet hole and a separation action when the upper knife body 10 for rivet hole separates from the lower knife body 11 for rivet hole. The can tab to be punch cut for rivet hole is located between the upper knife body 10 for rivet hole and the lower knife body 11 for rivet hole, and the can tab body is located on the lower knife body 11 for rivet hole. When the upper knife body 10 for rivet hole descends, the upper knife body 10 for rivet hole cooperates with the lower knife body 11 for rivet hole to punch cut the can tab to form a rivet hole on the can tab.

[0032] The lower end of the upper knife body 10 for rivet hole is provided with a punch cutting section 12. The upper end surface of the lower knife body 11 for rivet hole is provided with a shaped hole 13 for the punch cutting section 12 to extend into. The outer diameter of the punch cutting section 12 is slightly smaller than the inner diameter of the shaped hole 13. Here, slightly smaller means that only a corresponding insertion gap is reserved between the outer diameter of the punch cutting section 12 and the inner diameter of the shaped hole 13. That is, the lower end of the punch cutting section 12 can be inserted into the shaped hole 13 to form a punch cutting section of the rivet hole. The outer peripheral surface of the punch cutting section 12 is provided with at least one protruding punch cutting part 14 protruding from the outer peripheral surface of the punch cutting section 12. The inner peripheral wall of the upper opening of the shaped hole 13 is provided with at least one recessed part 15 recessed toward the inner wall of the shaped hole 13. The outer peripheral surface profile of the protruding punch cutting part 14 is slightly smaller than the inner peripheral surface profile of the recessed part 15, so that the protruding punch cutting part 14 can enter the recessed part 15 to realize a punch cutting action. After top-down projection, the protruding punch cutting part 14 and the recessed part 15 are basically coincident. In the process of punch cutting the rivet hole, due to the arrangement of the protruding punch cutting part 14, a notch corresponding to the protruding punch cutting part 14 can be formed on the inner wall of the rivet hole. The notch penetrates the upper and lower surfaces of the can tab body. In order to better form the notch, the recessed part 15 corresponding to the protruding punch cutting part 14 is arranged. In the punch cutting process, the protruding punch cutting part 14 can cooperate with the recessed part 15, that is, the protruding punch cutting part 14 enters the recessed part 15 to form a punch cutting on the inner wall of the rivet hole to form a notch on the inner wall of the rivet hole.

[0033] In some embodiments, the protruding punching portion 14 can be disposed on the outer peripheral surface of the lowest end of the punching section 12, or it can be disposed at a position that is a certain distance upward from the outer peripheral surface of the lowest end of the punching section 12. When disposed on the outer peripheral surface of the lowest end of the punching section 12, during the punching process, while the lowest end of the punching section 12 punches the rivet hole, the protruding punching portion 14 can also simultaneously form a groove on the inner wall of the rivet hole. When the protruding punching portion 14 is a certain distance upward from the outer peripheral surface of the lowest end of the punching section 12, the lowest end of the punching section 12 can form a rivet hole on the pull tab of the can. Then the punching section 12 continues to descend, and the protruding punching portion 14 punches from the inner wall of the already formed rivet hole, forming a corresponding groove on the inner wall of the rivet hole.

[0034] In some embodiments, the depth of the recess 15 along the inner wall of the forming hole 13 is not less than the depth to which the punching section 12 is inserted into the forming hole 13. When the punching section 12 extends into the forming hole 13, although the vertical stroke of the upper die body 10 of the rivet hole is determined by the lifting stroke of the upper template, in order to better fit between the punching section 12 and the forming hole 13, the depth of the forming hole 13 is set to be greater than the length of the punching section 12 extending into it.

[0035] In some embodiments, the protruding punching portion 14 is integrally formed on the outer peripheral surface of the punching section 12 to ensure the connection strength between the protruding punching portion 14 and the upper blade body 10 of the rivet hole and extend the service life of the protruding punching portion 14. The protruding punching portion 14 is preferably arranged with a certain extension length along the outer peripheral axial direction of the punching section 12 to ensure the strength of the protruding punching portion 14. Of course, the protruding punching portion 14 can also be arranged in a protruding dot manner. This method is only different in that the arrangement length of the protruding punching portion 14 in the axial direction of the punching section 12 is different.

[0036] In some embodiments, see Figure 3 As shown, three protruding punching portions 14 are provided, and the three protruding punching portions 14 are arranged at intervals on the outer peripheral surface of the punching section 12. By providing multiple protruding punching portions 14, three grooves can be formed on the inner wall of the rivet hole formed by punching.

[0037] In some embodiments, see Figure 4 As shown, three protruding punching portions 14 are provided, and the three protruding punching portions 14 are arranged continuously on the outer peripheral surface of the punching section 12. That is, the inner wall of the rivet hole formed by punching can form three adjacent slots; of course, it is also possible to use... Figure 5 The arrangement shown involves a greater number of protruding punched portions 14, with adjacent protruding punched portions 14 forming a continuous joint, covering the periphery of the inner wall of the rivet hole. In the various arrangements of the protruding punched portions 14 described above, the corresponding recessed portions 15 are also arranged in a corresponding manner on the inner periphery of the forming hole 13.

[0038] In some embodiments, the convex cutting part 14 is a circular part smaller than a semicircle, and the center of the circle is on the same circle after being projected from top to bottom, so as to ensure that a regular notch is formed on the inner wall of the pull ring rivet hole. The outer wall of the convex cutting part 14 is connected to the outer wall of the cutting section 12 through an arc-shaped surface, and the corresponding notch edge of the pull ring rivet hole is connected to the inner wall of the pull ring rivet hole through an arc-shaped surface.

[0039] In some embodiments, the upper rivet hole cutter 10 is provided with an air inlet channel, which includes a gas guiding channel 16 and a gas blowing channel 17. The gas guiding channel 16 extends from the upper end surface of the upper rivet hole cutter 10 to the lower part of the upper rivet hole cutter 10 along the axial direction, and the gas blowing channel 17 extends from the lower end surface of the upper rivet hole cutter 10 to the middle part of the upper rivet hole cutter 10 along the axial direction, and is in communication with the gas guiding channel 16. During the cutting process, compressed gas is introduced into the gas guiding channel 16, which can generate pressure on the pull ring body of the can from top to bottom, so that the pull ring body of the can is attached to the upper end surface of the lower rivet hole cutter 11 to a certain extent, thereby increasing the resistance of the pull ring body of the can during the cutting process. In addition, after the cutting is completed, the compressed gas can blow the cut part of the pull ring body of the can downward, so that the cut part is quickly separated from the rivet hole. The inner diameter of the gas guiding channel 16 is greater than the inner diameter of the gas blowing channel 17, so as to increase the pressure of the compressed gas in the gas blowing channel 17, thereby improving the pressure on the pull ring body of the can before cutting and the blowing capacity of the waste after cutting.

[0040] In some embodiments, the outer diameter of the cutting section 12 is smaller than the outer diameter of the middle part of the upper rivet hole cutter 10, and the upper end outer wall of the cutting section 12 is connected to the outer wall of the middle part of the upper rivet hole cutter 10 through an arc-shaped connecting surface 18. The length of the gas blowing channel 17 is greater than the length of the cutting section 12, that is, the gas guiding channel 16 does not extend into the cutting section 12, so as to avoid affecting the strength of the cutting section 12 due to the large inner diameter of the gas guiding channel 16.

[0041] In some embodiments, the lower rivet hole cutter 11 extends upward from the lower end surface along the axial direction, and is connected to the forming hole 13 through a blanking channel 19. The blanking channel 19 is a tapered channel that gradually increases from top to bottom, and the inner diameter of the small end of the blanking channel 19 is equal to the inner diameter of the forming hole 13. The waste after cutting falls from the forming hole 13 and is discharged from the lower rivet hole cutter 11 through the blanking channel 19. Due to the tapered design of the blanking channel 19, the possibility of clogging of the waste in the blanking channel 19 is reduced.

[0042] In some embodiments, the outer periphery of the rivet hole upper cutter body 10 and the rivet hole lower cutter body 11 is respectively provided with a positioning groove 20. The positioning groove 20 on the rivet hole upper cutter body 10 and the positioning groove 20 on the rivet hole lower cutter body 11 are located on both sides after being projected from top to bottom, that is, they are arranged in a staggered manner. The specific positioning groove 20 is formed on the outer periphery of the mounting table stage 21 of each cutter body. For example, when the rivet hole upper cutter body 10 is installed on the upper die plate, a positioning pin is fixedly arranged on the upper die plate, and the positioning pin is located in the positioning groove 20. Similarly, when the rivet hole lower cutter body 11 is installed on the lower die plate, a positioning pin is also fixedly arranged on the lower die plate, and the positioning pin is located in the positioning groove 20. In this way, the installation accuracy of the rivet hole upper cutter body 10 and the rivet hole lower cutter body 11 can be ensured, that is, the positional butt joint accuracy of the convex punching and cutting part 14 and the recessed part 15 can also be ensured, and the punching and cutting process can be smoothly carried out.

[0043] Finally, it should be noted that: the above embodiments are only the preferred embodiments of the present application for explaining the technical solutions of the present application, but not limiting them, and are not limiting the patent scope of the present application; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application; in addition, the technical solutions of the present application are directly or indirectly used in other related technical fields, which are also included in the patent protection scope of the present application.

Claims

1. A punching device for riveting holes in aluminum can pull tabs, comprising an upper riveting blade and a lower riveting blade, wherein the upper and lower riveting blades move relative to each other, characterized in that... The lower end of the upper blade of the rivet hole has a punching section; The upper end face of the rivet hole cutter body has a forming hole for the punching section to extend into, and the outer diameter of the punching section is smaller than the inner diameter of the forming hole; The outer peripheral surface of the punching section shall have at least one protruding punching portion that protrudes from the outer peripheral surface of the punching section; The upper inner peripheral wall of the forming hole has at least one recessed part that is recessed towards the inner wall of the forming hole. The outer peripheral surface profile of the protruding punched part is smaller than the inner peripheral surface profile of the recessed part.

2. The punching device for riveting holes in aluminum can pull rings as described in claim 1, characterized in that, The depth of the recess along the inner wall of the forming hole is not less than the depth to which the punching section is inserted into the forming hole.

3. The punching device for riveting holes in aluminum can pull rings as described in claim 1, characterized in that, The protruding punching section is integrally formed on the outer peripheral surface of the punching section.

4. The punching device for riveting holes in aluminum can pull rings as described in claim 1, characterized in that, Multiple protruding punching parts are provided, and the multiple protruding punching parts are arranged at intervals on the outer peripheral surface of the punching section.

5. The punching device for riveting holes in aluminum can pull rings as described in claim 1, characterized in that, Multiple protruding punching parts are provided, and the multiple protruding punching parts are arranged continuously on the outer peripheral surface of the punching section.

6. The punching device for riveting holes in can pull tabs as described in claim 4 or 5, characterized in that, The protruding punched part is a circular part smaller than a semicircle. When projected from top to bottom, the center of the circular part is on the same circle.

7. The punching device for riveting holes in can pull tabs as described in any one of claims 1-5, characterized in that, The upper cutting tool body of the rivet hole is provided with an air intake channel, which includes an air intake channel and an air blowing channel. The air intake channel extends axially from the upper end face of the upper cutting tool body towards the lower part of the upper cutting tool body, and the air blowing channel extends axially from the lower end face of the upper cutting tool body towards the middle part of the upper cutting tool body, and communicates with the air intake channel. The inner diameter of the air intake channel is larger than the inner diameter of the air blowing channel.

8. The punching device for riveting holes in aluminum can pull rings as described in claim 7, characterized in that, The outer diameter of the punching section is smaller than the middle outer diameter of the upper cutter body of the rivet hole. The upper outer peripheral wall of the punching section and the middle outer wall of the upper cutter body of the rivet hole are connected by an arc-shaped transition surface; the length of the air blowing channel is greater than the length of the punching section.

9. The punching device for riveting holes in aluminum can pull rings as described in claim 1, characterized in that, The rivet hole cutter body extends upward along the axial direction from the lower end face, forming a blanking channel connected with the forming hole. The blanking channel is a tapered channel that gradually increases in size from top to bottom, and the inner diameter of the small end of the blanking channel is equal to the inner diameter of the forming hole.

10. The punching device for riveting holes in aluminum can pull rings as described in claim 1, characterized in that, Positioning grooves are provided on the outer periphery of the upper and lower cutting bodies of the rivet hole.

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