Stamping mechanism for paper pad in copper cap

Abstract

The utility model provides a punching mechanism for a paper pad in a copper cap, which is used for automatically punching and placing the paper pad into an opening of the copper cap, the punching mechanism comprises a punching rod and a pressing rod which are in vertical linear motion, the pressing rod is telescopically arranged in the punching rod, the punching rod moves downwards to punch the paper pad and descends to be right above the copper cap, and the pressing rod extends into the opening of the copper cap from the punching rod. A hollow section is formed in the lower section of the punching rod in the length direction of the punching rod, vertical sliding grooves are formed in the two opposite sides of the outer wall of the punching rod and penetrate through the hollow section, and the upper end of the pressing rod is connected into the sliding grooves through bolts and vertically slides in the sliding grooves. Blanking of a paper pad and pushing of the paper pad into the bottom of a copper cap are completed through different structures respectively, allowance exists between the pressing rod and the copper cap, the situation that the inner wall of the copper cap is easily scratched due to the fact that the punching rod directly enters the copper cap is avoided, and production quality is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of automatic production of fuses, in particular to a punching mechanism for a paper pad inside a copper cap. Background Art

[0002] Fuses are used to protect electrical systems. They can instantly cut off circuits in the event of an abnormal short circuit or overcurrent, protecting devices within the system from damage. Fuses typically consist of a tube containing the fuse element, with copper caps attached to each end. Some copper caps may contain paper inserts to enhance the seal and improve the fuse's ability to break and extinguish arcs.

[0003] The existing paper pad assembly requires cutting the paper pad into a shape that fits the opening of the copper cap, and then inserting it into each copper cap one by one. When using automated equipment for production, refer to Figure 1 , which is a cross-sectional view of the Chinese utility model patent "A punching mechanism for a paper pad in a copper cap" with application number 202322959394.0. The paper pad punching device includes a punching mechanism and a paper pad conveying mechanism. The punching mechanism includes a punch rod 311' that moves vertically linearly. The lower end of the punch rod 311' is movably extended into the opening 71' of the copper cap 7' in the paper pad punching station S2'. The paper pad conveying mechanism continuously outputs a long strip of paper pad 8' that passes horizontally through the paper pad punching station S2'. The paper pad 8' is located between the copper cap 7' and the lower end of the punch rod 311'; when the punch rod 311' moves downward, a circular paper pad 8' can be punched out from the long strip of paper pad 8', and the circular paper pad 8' can be placed in the opening 71' of the copper cap 7'; thereby, automatic and efficient punching operation of the paper pad 8' can be achieved.

[0004] However, in the above structure, when the punch rod 311' feeds the punched paper pad 8' downward into the opening 71' of the copper cap 7', the lower end of the punch rod 311' enters the copper cap 7'. In order to match the punched paper pad 8' with the copper cap 7', the shape of the lower surface of the punch rod 311' is consistent with the shape and size of the copper cap 7', and the lower end of the punch rod 311' matches the inner diameter of the copper cap 7'. Because the entire mechanism is inevitably subject to shaking, vibration, and displacement during operation, the punch rod 311' moving linearly downward will experience a certain degree of deviation. When the lower end of the punch rod 311' enters the copper cap 7', it is very likely to collide, rub, or scrape against the inner wall of the copper cap 7', causing scratches and damage to the copper cap 7'. Scratches on the inner wall of the copper cap can lead to the hidden danger of copper exposure, thereby reducing the yield rate. Utility Model Content

[0005] The utility model aims to provide a punching mechanism for a paper pad inside a copper cap, which is beneficial to reducing punching resistance and can avoid scratching the inner wall of the copper cap by a single punching method.

[0006] In order to achieve the above objectives, the solution of the present invention is:

[0007] A punching mechanism for a paper pad inside a copper cap is used to automatically punch out the paper pad and place it into the opening of the copper cap. The punching mechanism includes a punch rod and a pressure rod that move vertically linearly. The pressure rod is telescopically arranged inside the punch rod. The punch rod moves downward to punch out the paper pad and descends to just above the copper cap. The pressure rod extends from the punch rod into the opening of the copper cap.

[0008] Furthermore, a hollow section is formed in the lower section of the punch rod along the length direction of the punch rod, and a vertical slide groove is provided on opposite sides of the outer wall of the punch rod. The slide groove runs through the hollow section, and the upper end of the pressure rod is connected to the slide groove by a pin and slides vertically in the slide groove.

[0009] Furthermore, the pin connecting the pressure rod is also connected to a movable block, and the movable block is connected to the piston rod of a cylinder. The piston rod drives the movable block to move vertically linearly, so that the movable block drives the pressure rod to slide vertically relative to the slide groove. After the pressure rod moves downward relative to the slide groove, it extends out of the punch rod.

[0010] Furthermore, the stamping mechanism also includes a bracket, a horizontal mounting plate is provided in the middle of the bracket, the lower end of the punch rod passes through the through hole provided on the mounting plate and moves vertically linearly, a fixed block is fixed on the lower surface of the mounting plate, the cylinder is installed on the fixed block, the movable block is located below the fixed block, and the pin passes through the movable block, the punch rod, and the pressure rod in sequence.

[0011] Furthermore, the stamping mechanism also includes a connecting rod mechanism and a driving mechanism. The punch rod is slidably inserted into a linear bearing installed on the mounting plate, and the lower end of the punch rod is vertically aligned with the paper pad station; the upper end of the punch rod is connected to the connecting rod mechanism, and the connecting rod mechanism is connected to the driving mechanism. The punch rod moves vertically back and forth up and down through the connecting rod mechanism driven by the driving mechanism, so as to movably extend into the opening of the copper cap.

[0012] Furthermore, a connecting rod mechanism is connected to the top of the bracket, and the connecting rod mechanism includes a rocker arm and a swing block. The middle part of the rocker arm is rotatably connected to the mounting seat at the top of the bracket, one end of the rocker arm is connected to the driving device for swinging, and the other end of the rocker arm is hinged to the upper end of the swing block, and the lower end of the swing block is hinged to the upper end of the punch rod.

[0013] Furthermore, before the punch rod moves downward to punch the paper pad, the pressure rod remains in the initial position inside the punch rod, and the lowest end of the pressure rod in the initial position is higher than the lower periphery of the punch rod.

[0014] Furthermore, the cross section of the portion of the bottom of the pressure rod that enters the copper cap is smaller than the cross section of the interior of the copper cap, and the pressure rod does not contact the inner wall of the copper cap when placed in the opening of the copper cap.

[0015] Furthermore, a pressing surface is provided at the bottom of the pressing rod.

[0016] After adopting the above scheme, when punching out the paper pad and feeding the paper pad into the copper cap, the utility model first uses the punch rod to make a first downward displacement to punch out the paper pad of the size and shape corresponding to the copper cap, and then the pressure rod placed inside the punch rod is moved downward for a second time. The cross section of the pressure rod is smaller than the cross section inside the copper cap. When the pressure rod is extended into the copper cap to push the paper pad into the bottom surface of the copper cap for bonding, the gap between the pressure rod and the inner wall of the copper cap is larger, which can avoid the punch rod directly punching to scratch the inner wall of the copper cap. Pressing the paper pad into place by the internal pressure rod can avoid damaging the copper cap by a single punching method, thereby improving production quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a cross-sectional view of the prior art solution.

[0018] Figure 2 This is a schematic diagram of the three-dimensional structure of the utility model (showing the initial state).

[0019] Figure 3 for Figure 2 Three-dimensional structure diagram from another perspective.

[0020] Figure 4 for Figure 2 Cross-sectional view.

[0021] Figure 5 This is a schematic diagram of the three-dimensional structure of the utility model (showing the state after the pressure rod is displaced downward).

[0022] Figure 6 for Figure 5 Three-dimensional structure diagram from another perspective.

[0023] Figure 7 for Figure 5 Cross-sectional view.

[0024] Figure 8 This is an exploded view of the present invention.

[0025] Description of Figure Numbers:

[0026] 311' punch rod; S2' paper pad punching station; 7' copper cap; 71' opening; 8' paper pad;

[0027] 100 punching mechanism; 11 punching rod; 111 slide slot; 12 first hinge axis; 13 swing block; 14 second hinge axis; 15 swing rod; 16 third hinge axis;

[0028] 21 pressure rod; 211 latch; 212 pressure surface; 22 cylinder; 221 piston rod; 231 fixed block; 232 movable block; 24 linear bearing;

[0029] 3 bracket; 31 base; 32 mounting plate; 321 through hole; 33 mounting seat. DETAILED DESCRIPTION

[0030] In order to further explain the technical solution of the present invention, the present invention will be described in detail below through specific embodiments.

[0031] See Figures 2 to 8 As shown, the utility model discloses a punching mechanism 100 for a paper pad inside a copper cap, which is used to automatically punch out a paper pad and place it into the opening of the copper cap. The punching mechanism 100 includes a punch rod 11 and a pressure rod 21 that can move vertically linearly, wherein the pressure rod 21 is telescopically arranged inside the punch rod 11, and the punch rod 11 moves downward to punch out the paper pad and descends to just above the copper cap (not shown in the figure), and the pressure rod 21 then extends from the punch rod 11 into the opening of the copper cap, automatically placing the punched paper pad into the opening of the copper cap.

[0032] Compared with the technical solution mentioned in the background technology, in which the paper pad is directly punched out by the punch rod 11 and directly inserted into the copper cap to push the paper pad into the bottom of the copper cap, the above solution is different in that the punching of the paper pad and the pushing of the paper pad into the bottom of the copper cap are respectively completed by different structures, and the stamping mechanism is designed as a composite part to form a new punch needle structure, which prevents the punch rod 11 from directly entering the interior of the copper cap and causing damage to the copper cap. Specifically, when punching out the paper pad and feeding it into the copper cap, the punch rod 11 is first used to perform a first downward displacement to punch out a paper pad corresponding to the size and shape of the copper cap, and the punch rod 11 is stopped above the copper cap without contacting the copper cap; at this time, the pressure rod 21 is used to perform a second downward displacement, and the pressure rod 21 is accommodated inside the punch rod 11. The cross-section of the pressure rod 21 is smaller than the cross-section of the punch rod 11, and therefore also smaller than the cross-section of the copper cap. Since the pressure rod 21 does not need to be responsible for punching out a paper pad that matches the copper cap, its cross-section does not need to be set according to a shape and size close to the copper cap, and can be set to a small size, so that the cross-section of the part of the pressure rod 21 that enters the copper cap is smaller than the cross-section inside the copper cap, and the pressure rod 21 does not contact the inner wall of the copper cap when placed in the opening of the copper cap. When the pressure rod 21 is inserted into the copper cap and the paper pad is pushed into the bottom surface of the copper cap for bonding, a large gap is left between the pressure rod 21 and the inner wall of the copper cap. There is a margin between the pressure rod 21 and the copper cap, and even slight shaking will not easily scratch the inner wall of the copper cap, thereby preventing damage to the copper cap. The cross-section of the bottom of the pressure rod 21 is not limited; it only needs to be sufficient to push the paper pad into the bottom of the copper cap so that the adhesive surface on the back of the paper pad can bond with the bottom surface of the copper cap.

[0033] In this embodiment, the lower section of the punch rod 11 is formed with a hollow section along the length direction of the punch rod 11, and the punch rod 11 is also directly a hollow rod, which is beneficial to reducing the resistance to breaking. A vertical slide groove 111 is provided on the opposite sides of the outer wall of the punch rod 11. The slide groove 111 passes through the hollow section, so that the slide groove 111 forms a strip-shaped through groove on the punch rod 11. The upper end of the pressure rod 21 can be connected to the slide groove 111 through the pin 211 and slide vertically in the slide groove 111, that is, the length of the slide groove 111 is the length by which the pressure rod 21 can be displaced relative to the punch rod 11.

[0034] Further reading Figure 4 、 Figure 7 , which are cross-sectional views of the pressure rod 21 in this embodiment before and after displacement. When the pressure rod 21 in this embodiment is in the initial position, the latch 211 is located at the uppermost end of the slide groove 111. When the pressure rod 21 moves downward, the latch 211 slides to the lowermost end of the slide groove 111. At this time, the pressure rod 21 extends into the interior of the copper cap.

[0035] In this embodiment, the pin shaft 211 connecting the pressure rod 21 is simultaneously connected to a movable block 232. The movable block 232 can be connected to the piston rod of a cylinder 22. The piston rod 221 drives the movable block 232 to move vertically linearly, so that the movable block 232 drives the pin 211 to slide vertically in the slide groove 111, and then drives the pressure rod 21 to move vertically up and down linearly. The movable block 232 drives the pressure rod 21 to slide vertically relative to the slide groove 111. After moving downward relative to the slide groove 111, the pressure rod can extend out of the punch rod 11 to push the paper pad into the opening of the copper cap.

[0036] Specifically, the punching mechanism also includes a bracket 3, with a horizontal mounting plate 32 disposed in the middle of the bracket 3. In this embodiment, the bracket 3 may include a base 31 with the mounting plate 32 disposed horizontally thereon. The lower end of the punch rod 11 passes through a through hole 321 disposed in the mounting plate 32 for vertical linear motion. To ensure the stability of the linear motion of the punch rod 11, a linear bearing 24 is also disposed within the through hole 321 in the mounting plate 32. The punch rod 11 slides through the linear bearing 24 mounted on the mounting plate. A fixed block 231 may be fixed to the lower surface of the mounting plate 32. The cylinder 22 is mounted on the fixed block 231. The movable block 232 is located below the fixed block 231. The latch 211 passes through the movable block 232, the punch rod 11, and the pressure rod 21 in sequence. When the pressure rod 21 needs to be driven, the cylinder 22 is driven, and the piston rod 221 moves downward. The movable block 232 fixedly connected to the piston rod 221 also moves downward, and the other end of the movable block 232 is connected to the latch 211, driving the latch 211 to slide downward in the slide groove 111, and the pressure rod 21 also moves downward.

[0037] In this embodiment, before the punch 11 moves downward to cut the paper pad, the pressure rod 21 remains in its initial position within the punch 11. In this initial position, the lowest end of the pressure rod 21 is higher than the lower edge of the punch 11. This allows the punch 11 to more smoothly cut the paper pad into the desired shape using its lower edge. The pressure rod 21 has a pressing surface 212 at its bottom, which stabilizes the action of the pressure rod 21 in pushing the paper pad.

[0038] In order to realize the automatic operation of the punching mechanism 100, the punching mechanism also includes a connecting rod mechanism and a driving mechanism that can drive the punch rod 11 to move up and down. The punch rod 11 slides through the linear bearing 24 installed on the mounting plate 32, and the lower end of the punch rod 11 is vertically aligned with the paper pad punching station (not shown in the figure). The upper end of the punch rod is connected to the connecting rod mechanism, and the connecting rod mechanism is connected to the driving mechanism (not shown in the figure). The punch rod 11 can move vertically back and forth up and down through the connecting rod mechanism driven by the driving mechanism to move to the top of the copper cap and cut out the paper pad. The driving mechanism may include a driven rod that swings up and down, and the punch rod 11 and the driven rod are respectively vertically arranged on both sides of the bracket 3. Combined Figure 6 、 Figure 8 As shown, in this embodiment, the connecting rod mechanism is connected to the top of the bracket 3, and the connecting rod mechanism includes a rocker arm 15 and a swing block 13. The middle part of the rocker arm 15 is rotatably connected to the mounting seat 33 at the top of the bracket 3. One end of the rocker arm 15 is connected to the driving device (driven rod) for swinging, and the other end of the rocker arm 15 is hinged to the upper end of the swing block 13, and the lower end of the swing block 15 is hinged to the upper end of the punch rod 11.

[0039] In this embodiment, the upper end of the punch rod 11 is connected to the swing block 13 of the linkage mechanism, driven by the swing block 13 to perform vertical linear motion. The middle portion of the swing arm 15 is rotatably connected to the mounting seat 33 at the top of the bracket 3 via a third hinge shaft 16. The rear end of the swing arm 15 is connected to the drive mechanism for swinging motion. The front end of the swing arm 15 is hinged to the upper end of the swing block 13 via a second hinge shaft 14. The lower end of the swing block 13 is hinged to the upper end of the punch rod 11 via a first hinge shaft 12. During operation, the up and down swinging of the drive mechanism (driven rod) causes the front end of the swing arm 15 to swing, which in turn causes the swing block 13 to swing. The swing block 13 acts as a living hinge, absorbing the kinetic energy of the swinging motion and simultaneously driving the punch rod 11 to perform vertical linear motion within the linear bearing 24. In other words, the provision of the swing arm 15 and swing block 13 prevents the punch rod 11 from swinging, maintaining vertical linear motion at all times, thus ensuring the stability of the paper punch pad.

[0040] After adopting the above structure, when the punching mechanism 100 of the present invention is working, a paper pad and a copper cap are correspondingly provided below the punching mechanism 100, wherein the paper pad is in a tensioned state for easy punching. The rolled paper pad can be delivered to the bottom of the punching mechanism 100 through a paper pad conveying mechanism, and the copper cap can also be delivered to the bottom of the punching mechanism 100 through a copper cap conveying structure. The paper pad is located between the punching mechanism 100 and the copper cap, and a backing adhesive can be provided on the side of the paper pad facing the copper cap to facilitate the subsequent bonding of the paper pad and the copper cap. The shapes of the punch rod 11 and the pressure rod 21 can be set in multiple groups to match different copper caps, so that the shape and size of the punched paper pad match the shape and size of the copper cap.

[0041] When the punching mechanism 100 is working, it can complete two working steps:

[0042] 1. The punch rod 11 makes the first downward displacement: the rear end of the rocker arm 15 is pushed up by the external driving device, the front end of the rocker arm 15 is pressed down, and the swing block 13 is also pressed downward. Driven by the swing block 13, the punch rod 11 moves vertically along the linear bearing 24, causing the punch rod 11 to move downward in the vertical direction. At this time, the lower periphery of the punch rod 11 breaks through the tensioned paper pad, cuts out the paper pad of appropriate shape, and stops above the copper cap.

[0043] 2. The pressure rod 21 moves downward for the second time: the piston rod 221 in the driving cylinder 22 pushes the movable block 232 to move downward, driving the latch 211 to slide downward in the slide groove 111. The pressure rod 21 moves downward with the latch 211 to extend out of the punch 11, and extends into the copper cap to push the paper pad into the bottom surface of the copper cap for bonding.

[0044] Therefore, the utility model mainly completes the tasks of punching the paper pad and pushing the paper pad into the bottom of the copper cap by different structures respectively. Since the pressure rod 21 does not need to be responsible for punching the paper pad, the size can be set to a smaller size that is convenient for entering the copper cap. After being inserted into the copper cap, the gap between the pressure rod 21 and the inner wall of the copper cap is larger. When a slight shake occurs, it is not easy to scratch the inner wall of the copper cap. This can avoid the situation in the background technology where the punch rod 11 needs to be inserted into the copper cap to push the paper pad after punching the paper pad, which causes the punch rod 11 to scratch the inner wall of the copper cap.

[0045] The above is only an embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A punching mechanism for a paper pad inside a copper cap, used for automatically punching a paper pad into an opening of a copper cap, characterized by: The punching mechanism includes a punch rod and a pressure rod that move vertically linearly. The pressure rod is telescopically arranged inside the punch rod. The punch rod moves downward to punch the paper pad and descends to just above the copper cap. The pressure rod extends from the punch rod to the opening of the copper cap.

2. A punching mechanism for a paper pad inside a copper cap according to claim 1, characterized in that: The lower section of the punch rod is formed with a hollow section along the length direction of the punch rod, and a vertical slide groove is provided on opposite sides of the outer wall of the punch rod. The slide groove runs through the hollow section, and the upper end of the pressure rod is connected to the slide groove by a pin and slides vertically in the slide groove.

3. The punching mechanism for the paper pad inside the copper cap according to claim 2, characterized in that: The pin connecting the pressure rod is also connected to a movable block, and the movable block is connected to the piston rod of a cylinder. The piston rod drives the movable block to move vertically linearly, so that the movable block drives the pressure rod to slide vertically relative to the slide groove. After the pressure rod moves downward relative to the slide groove, it extends out of the punch rod.

4. The punching mechanism for the paper pad inside the copper cap according to claim 3, characterized in that: The stamping mechanism also includes a bracket, a horizontal mounting plate is provided in the middle of the bracket, the lower end of the punch rod passes through the through hole provided on the mounting plate and moves vertically linearly, a fixed block is fixed on the lower surface of the mounting plate, the cylinder is installed on the fixed block, the movable block is located below the fixed block, and the pin passes through the movable block, the punch rod, and the pressure rod in sequence.

5. The punching mechanism for the paper pad inside the copper cap according to claim 4, characterized in that: The punching mechanism also includes a connecting rod mechanism and a driving mechanism. The punch rod slides through a linear bearing installed on the mounting plate, and the lower end of the punch rod is vertically aligned with the paper pad station; the upper end of the punch rod is connected to the connecting rod mechanism, and the connecting rod mechanism is connected to the driving mechanism. The punch rod moves vertically back and forth up and down through the connecting rod mechanism driven by the driving mechanism.

6. The punching mechanism for the paper pad inside the copper cap according to claim 5, characterized in that: The connecting rod mechanism is connected to the top of the bracket. The connecting rod mechanism includes a rocker arm and a swing block. The middle part of the rocker arm is rotatably connected to the mounting seat at the top of the bracket. One end of the rocker arm is connected to the driving device for swinging, and the other end of the rocker arm is hinged to the upper end of the swing block. The lower end of the swing block is hinged to the upper end of the punch rod.

7. A punching mechanism for a paper pad inside a copper cap according to any one of claims 1 to 3, characterized in that: Before the punch rod moves downward to punch the paper pad, the pressure rod remains in the initial position inside the punch rod, and the lowest end of the pressure rod in the initial position is higher than the lower periphery of the punch rod.

8. A punching mechanism for a paper pad inside a copper cap according to any one of claims 1 to 3, characterized in that: The cross section of the portion of the bottom of the pressure rod entering the copper cap is smaller than the cross section of the interior of the copper cap, and the pressure rod does not contact the inner wall of the copper cap when placed in the opening of the copper cap.

9. The punching mechanism for the paper pad inside the copper cap according to claim 8, characterized in that: The bottom of the pressure rod is provided with a pressure surface.

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