Automatic hemming and stamping device for packaging metal barrel cover

Abstract

The invention relates to the technical field of metal barrel cover production, in particular to a packaging metal barrel cover automatic hemming and stamping device which comprises a base, an n-shaped support is fixedly installed on the upper end face of the base, and a supporting seat located below the horizontal section of the n-shaped support is fixedly installed on the upper end face of the base. The supporting base and the n-shaped support are jointly provided with a bearing mechanism used for bearing the metal barrel cover. An integrated operation model of extruding, position correcting and guiding is adopted to quickly complete automatic hemming and stamping of the metal barrel cover, and pre-bending guiding is provided for the metal barrel cover in the hemming and stamping process through multi-section operation and self-adaptive expansion in combination with cooperation of extruding fixing and expansion correcting, so that the flowing path and distribution of materials are optimized, and the material quality is improved. And meanwhile, it is ensured that the position of the metal barrel cover is stable in the forming process, material stress is gradually released, the cracking or deformation risk is reduced, the forming precision and size stability are improved, and the more uniform edge curling effect is achieved, so that it is ensured that the metal barrel cover and the barrel cover body are perfectly attached, and the sealing effect is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of metal barrel lid production, and specifically to an automatic curling and stamping device for packaging metal barrel lids. Background Art

[0002] A packaging metal barrel lid is an important component for sealing and protecting the contents of a metal barrel. It is commonly used in the packaging and transportation of industries, chemicals, food, etc. to prevent the contents of the sealed barrel from spilling and to protect its contents from external contamination. In order to more firmly and securely close the metal barrel lid on the barrel body, it is necessary to perform curling and stamping treatment on the metal barrel lid during the production process (refer to Figure 7 ), so as to increase the structural rigidity of the barrel lid, make it not easily deformed when承受 pressure or impact, and eliminate its sharp edges, reducing the risk of cutting or scratching during operation.

[0003] Currently, there are the following disadvantages when curling and stamping a packaging metal barrel lid: 1. When curling and stamping a metal barrel lid, workers usually need to first place the metal barrel lid in the lower die, and then directly use stamping equipment to perform one-time curling and stamping forming on it. One-time curling and stamping forming will cause excessive stress concentration in some areas of the metal barrel lid material, resulting in cracking or deformation of the stamped metal barrel lid. And one-time stamping will cause uneven thickness distribution of the material at the curled edge, thus affecting the product strength and sealing performance; 2. During the process of placing the metal barrel lid in the corresponding position, workers need to manually adjust the position of the metal barrel lid. Due to the introduction of human error, there will be differences in the gaps between the metal barrel lid and the lower die, resulting in excessive stretching of the material at some areas with too large gaps, while material accumulation or wrinkles will occur at areas with too small gaps, making the unevenly curled metal barrel lid unable to perfectly fit the barrel body, thus reducing the sealing effect. And inconsistent curling forming of the metal barrel lid will cause differences in the structural strength of different parts, affecting the overall performance of the metal barrel lid. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides an automatic curling and stamping device for packaging metal barrel lids, which is achieved by the following specific technical means: An automatic curling and stamping device for packaging metal barrel lids includes a base. A U-shaped bracket is fixedly installed on the upper end surface of the base. A support seat is fixedly installed on the upper end surface of the base and is located below the horizontal section of the U-shaped bracket. A loading mechanism for carrying the metal barrel lid is jointly arranged on the support seat and the U-shaped bracket. The loading mechanism includes a support part arranged on the U-shaped bracket, and a connecting part for elastically supporting the support part is arranged on the support seat.

[0005] A driving mechanism is arranged on the U-shaped bracket, and an execution mechanism for cooperating with the bearing mechanism to perform curling and stamping operations on the metal bucket lid in multiple segments is arranged on the driving mechanism; the driving mechanism includes a driving part arranged on the U-shaped bracket to provide power for the execution mechanism, and a limiting part for providing vertical limit for the execution mechanism during operation is arranged on the supporting part.

[0006] The execution mechanism includes a curling and pressing part arranged on the driving part, a flat pressing part for squeezing and fixing the inside of the metal bucket lid to cooperate with the curling and stamping operation is arranged on the curling and pressing part, a position correcting part for expanding and correcting the position of the metal bucket lid is arranged on the flat pressing part, and a pre-bending part for pre-bending and guiding the inside of the metal bucket lid before curling is arranged on the curling and pressing part.

[0007] As a preferred technical solution of the present invention, the supporting part includes a vertical slide rail, a first slider and a supporting circular plate. The upper end surface of the base is fixedly installed with vertical slide rails that are symmetrically arranged front and back between the vertical sections of the U-shaped bracket. A first slider is slidably installed in the vertical slide rail, and a supporting circular plate located directly above the supporting seat is fixedly installed between the front and back symmetric first sliders.

[0008] As a preferred technical solution of the present invention, the connecting part includes a first sliding rod and a first spring. The upper end surface of the supporting seat is fixedly installed with a number of first sliding rods in a circumferential array. First sliding holes corresponding to the first sliding rods one by one are opened on the lower end surface of the supporting circular plate, and a first spring sleeved on the first sliding rod is fixedly installed between the supporting circular plate and the supporting seat.

[0009] As a preferred technical solution of the present invention, the driving part includes a hydraulic cylinder and a supporting cross plate. The hydraulic cylinder is fixedly installed on the horizontal section of the U-shaped bracket, and the telescopic end of the hydraulic cylinder is fixedly installed with a supporting cross plate located below the horizontal section of the U-shaped bracket.

[0010] As a preferred technical solution of the present invention, the limiting part includes a limiting column. The upper end surface of the supporting circular plate is fixedly installed with limiting columns that are symmetrically arranged front and back, and the upper ends of the front and back symmetric limiting columns slidably penetrate through the supporting cross plate.

[0011] As a preferred technical solution of the present invention, the curling and pressing part includes a lower die, an upper die, an upper arc groove and a lower arc groove. A ring-shaped lower die is fixedly installed at the center of the upper end surface of the supporting circular plate, and an upper die located directly above the lower die is fixedly installed on the lower end surface of the supporting cross plate. A positioning groove is opened at the center of the upper die, a circle of lower arc grooves is opened at the upper end of the inner ring wall of the lower die, and an upper arc groove matching the lower arc groove is opened on the upper die. The upper arc groove and the lower arc groove are combined to form a columnar cavity with an annular cross section.

[0012] As a preferred technical solution of the present invention, the flat pressing part includes a spring slide rod and a circular pressure plate, and the lower end surface of the upper mold is fixedly installed with a plurality of spring slide rods in a circular array, and the lower ends of the plurality of spring slide rods are jointly fixedly installed with a circular pressure plate located directly below the upper mold.

[0013] As a preferred technical solution of the present invention, the correction part includes a groove, a correction rod and a pressure roller. A plurality of grooves are opened on the outer ring wall of the circular pressure plate in a circular array. The correction rod is rotatably installed in the groove through a torsion spring rod, and a pressure roller is fixedly installed on the end of the correction rod away from the circular pressure plate.

[0014] As a preferred technical solution of the present invention, the pre-bending portion includes a limiting slide, a second slider, an expansion rod, an extrusion arc block and a spinning cone block. A plurality of limiting slides located below the upper arc groove are penetrated through the outer ring wall of the upper mold in a circular array. The second slider is slidably installed in the limiting slide through a second spring. The expansion rod is fixedly installed on the second slider. Extrusion arc blocks are fixedly installed at the ends of the expansion rods that are away from each other. A spinning cone block located in the alignment groove is fixedly installed at the center of the upper end surface of the circular pressure plate.

[0015] As a preferred technical solution of the present invention, the pressure roller and the extrusion arc block are both covered with a rubber layer, and the end of the pressure roller away from the circular pressure plate is arc-shaped.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. The automatic curling and stamping device for packaging metal barrel covers, through the coordinated use of the supporting mechanism, the driving mechanism and the actuator, adopts an integrated operation model of extrusion, correction and guidance to quickly complete the automatic curling and stamping of the metal barrel covers. Through multi-stage operation and adaptive expansion, combined with the cooperation of extrusion fixation and expansion correction, a pre-bending guide is provided for the metal barrel cover during the curling and stamping process, thereby optimizing the material flow path and distribution, and ensuring the stability of the position of the metal barrel cover during the forming process, gradually releasing material stress, reducing stress concentration, reducing the risk of cracking or deformation, improving forming accuracy and dimensional stability, and achieving a more uniform curling effect, thereby ensuring the perfect fit between the metal barrel cover and the barrel cover body and improving the sealing effect.

[0017] 2. The automatic curling and punching device for packaging metal barrel covers, through the coordinated use of the set driving mechanism and the actuator, can better control the direction of material movement and make the curling more uniform by adaptively expanding the pre-bending guide of the metal barrel cover before curling during the curling and punching process. The pre-bending can disperse the force on the material, reduce stress concentration, and reduce the risk of cracking or deformation. At the same time, it can avoid the rebound of the metal barrel cover and ensure the dimensional stability after forming.

[0018] 3. The automatic curling and punching device for packaging metal barrel covers can extrude, fix and expand the metal barrel covers during the curling and punching process through the set actuator. Extrusion and fixation can ensure that the barrel covers maintain a stable position during the punching process, while expansion and correction can optimize the material distribution, ensure that the material flows more evenly during the curling process, eliminate the initial deformation in the material, reduce the risk of wrinkles during the curling process, and improve the overall structural strength of the metal barrel covers.

[0019] 4. The automatic curling and stamping device for packaging metal barrel covers uses a multi-stage operation to complete the curling and stamping of the metal barrel covers through the coordinated use of the supporting mechanism and the actuator. The multi-stage operation can gradually form the metal barrel covers, thereby reducing the error of one-time forming and improving the overall forming accuracy. In addition, the staged forming can gradually release the stress in the material and reduce the risk of stress concentration and material cracking. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0021] Figure 2 It is a schematic diagram of the three-dimensional structure of the present invention when it is working.

[0022] Figure 3 It is a schematic diagram of the three-dimensional structure of the carrying mechanism of the present invention.

[0023] Figure 4 It is a three-dimensional structural schematic diagram of the driving mechanism and the actuator of the present invention.

[0024] Figure 5 It is a schematic diagram of the cross-sectional three-dimensional structure of the present invention.

[0025] Figure 6 for Figure 5 Schematic diagram of the enlarged structure at point A in the middle.

[0026] Figure 7 This is a diagram showing the process of curling and stamping the edge of a packaging metal barrel cover from a vertical state to a curled state.

[0027] In the figure: 1. Base; 2. U-shaped bracket; 3. Support seat; 4. Loading mechanism; 41. Support part; 411. Vertical slide rail; 412. First slider; 413. Support circular plate; 42. Connection part; 421. First slide bar; 422. First spring; 5. Driving mechanism; 51. Driving part; 511. Hydraulic cylinder; 512. Support cross plate; 52. Limiting part; 521. Limiting column; 6. Executing mechanism; 61. Rolling and pressing part; 611. Lower die; 612. Upper die; 613. Upper arc groove; 614. Lower arc groove; 62. Flat pressing part; 621. Spring slide bar; 622. Circular pressing plate; 63. Alignment part; 631. Groove; 632. Alignment rod; 633. Pressing roller; 64. Pre-bending part; 641. Limiting slideway; 642. Second slider; 643. Expansion rod; 644. Extrusion arc block; 645. Spindle-shaped block. Detailed implementation manners

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0029] Please refer to Figure 1 , an automatic curling and stamping device for packaging metal bucket lids, including a base 1. A U-shaped bracket 2 is fixedly installed on the upper end surface of the base 1. A support seat 3 is fixedly installed on the upper end surface of the base 1 and is located below the horizontal section of the U-shaped bracket 2. A loading mechanism 4 for loading metal bucket lids is jointly provided on the support seat 3 and the U-shaped bracket 2; the loading mechanism 4 includes a support part 41 provided on the U-shaped bracket 2, and a connection part 42 for elastically supporting the support part 41 is provided on the support seat 3.

[0030] Please refer to Figure 1 , a driving mechanism 5 is provided on the U-shaped bracket 2, and an executing mechanism 6 for cooperating with the loading mechanism 4 to perform curling and stamping operations on the metal bucket lid in multiple sections is provided on the driving mechanism 5.

[0031] Please refer to Figure 1 , the driving mechanism 5 includes a driving part 51 provided on the U-shaped bracket 2 and providing power for the executing mechanism 6, and a limiting part 52 for providing vertical limitation for the executing mechanism 6 during the execution of the operation is provided on the support part 41.

[0032] Please refer to Figure 1 and Figure 4, the actuator 6 includes a rolling and pressing part 61 disposed on the driving part 51. A flat pressing part 62 for cooperatively extruding and fixing the inside of the metal barrel lid during the curling and stamping operation is disposed on the rolling and pressing part 61. A position correcting part 63 for cooperatively expanding and correcting the position of the metal barrel lid is disposed on the flat pressing part 62. A pre-bending part 64 for cooperatively pre-bending and guiding the inside of the metal barrel lid before curling during the curling and stamping operation is also disposed on the rolling and pressing part 61.

[0033] Please refer to Figure 1 , Figure 2 and Figure 3 , the supporting part 41 includes a vertical sliding rail 411, a first slider 412 and a supporting circular plate 413. The vertical sliding rails 411 which are symmetrically arranged front and back and located between the vertical sections of the U-shaped bracket 2 are fixedly installed on the upper end surface of the base 1. The first slider 412 is slidably installed in the vertical sliding rail 411. The supporting circular plate 413 which is located directly above the supporting seat 3 is fixedly installed together between the symmetrically arranged first sliders 412 front and back.

[0034] Please refer to Figure 1 , Figure 2 and Figure 3 , the connecting part 42 includes a first sliding rod 421 and a first spring 422. A plurality of first sliding rods 421 are fixedly installed on the upper end surface of the supporting seat 3 in a circumferential array manner. First sliding holes corresponding to the first sliding rods 421 one by one are formed on the lower end surface of the supporting circular plate 413. The first spring 422 sleeved on the first sliding rod 421 is fixedly installed between the supporting circular plate 413 and the supporting seat 3.

[0035] Please refer to Figure 1 , Figure 2 and Figure 4 , the driving part 51 includes a hydraulic cylinder 511 and a supporting cross plate 512. The hydraulic cylinder 511 is fixedly installed on the horizontal section of the U-shaped bracket 2. The telescopic end of the hydraulic cylinder 511 is fixedly installed with the supporting cross plate 512 located below the horizontal section of the U-shaped bracket 2.

[0036] Please refer to Figure 1 , Figure 2 and Figure 3 , the limiting part 52 includes a limiting post 521. The limiting posts 521 which are symmetrically arranged front and back are fixedly installed on the upper end surface of the supporting circular plate 413. The upper ends of the symmetrically arranged limiting posts 521 slidably penetrate through the supporting cross plate 512.

[0037] Please refer to Figure 1 , Figure 3 , Figure 4 and Figure 5The rolling part 61 includes a lower mold 611, an upper mold 612, an upper arc groove 613 and a lower arc groove 614. An annular lower mold 611 is fixedly installed at the center of the upper end surface of the supporting circular plate 413, and an upper mold 612 located directly above the lower mold 611 is fixedly installed on the lower end surface of the supporting horizontal plate 512. A positioning groove is opened at the inner center of the upper mold 612, and a circle of lower arc grooves 614 are opened at the upper end of the inner ring wall of the lower mold 611. An upper arc groove 613 cooperating with the lower arc groove 614 is opened on the upper mold 612. The upper arc groove 613 and the lower arc groove 614 are combined to form a cylindrical cavity with a ring-shaped cross section.

[0038] During specific work, when the metal barrel cover needs to be curled and stamped, the metal barrel cover is first placed in the lower mold 611, and then the hydraulic cylinder 511 is started to lower the upper mold 612 through the supporting cross plate 512. During this process, the limiting column 521 limits the vertical direction of the supporting cross plate 512 to ensure that the docking position of the upper mold 612 and the lower mold 611 is level.

[0039] Then the upper mold 612 continues to descend, and at this time the upper mold 612 will first push the metal barrel cover, the lower mold 611 and the supporting circular plate 413 downward through the upper arc groove 613, and the first spring 422 between the supporting circular plate 413 and the supporting seat 3 will be compressed, and the vertical slide rail 411 and the first slider 412 will limit the descending direction of the supporting circular plate 413 until the supporting circular plate 413 can no longer descend.

[0040] At this time, the upper mold 612 continues to descend, and the flat pressing part 62 will squeeze and fix the metal barrel cover, and the position correction part 63 will cooperate to perform the first expansion and correction on the metal barrel cover, and the pre-bending part 64 will squeeze the vertical part of the metal barrel cover outward synchronously during the descending process of the upper mold 612, so as to perform a second expansion on the metal barrel cover to correct its position, and pre-bend and guide the vertical part of the metal barrel cover, so that the upper end of the vertical part of the metal barrel cover is pushed to the highest point inside the upper arc groove 613, and the inner wall of the upper arc groove 613 will guide the upper end of the vertical part of the metal barrel cover to continue to curl the vertical part of the metal barrel cover.

[0041] Then the upper mold 612 continues to descend until the upper mold 612 is fitted with the lower mold 611. During this process, the vertical part of the metal barrel cover will move along the upper arc groove 613 to the lower arc groove 614, and when the upper mold 612 is fitted with the lower mold 611, the curling stamping of the metal barrel cover is completed. In this way, the curling stamping of the metal barrel cover is completed by multi-stage operation, so that the metal barrel cover is gradually formed, the overall forming accuracy is improved, and the stress in the material is gradually released, reducing the risk of stress concentration and material cracking.

[0042] See also Figure 1 and Figure 4The flat pressing part 62 includes a spring slide bar 621 and a circular pressure plate 622. A plurality of spring slide bars 621 are fixedly installed on the lower end surface of the upper mold 612 in a circular array. A circular pressure plate 622 located directly below the upper mold 612 is fixedly installed on the lower ends of the plurality of spring slide bars 621.

[0043] See also Figure 1 , Figure 4 and Figure 6 The positioning part 63 includes a groove 631, a positioning rod 632 and a pressure roller 633. A plurality of grooves 631 are provided on the outer ring wall of the circular pressure plate 622 in a circular array. The positioning rod 632 is rotatably installed in the groove 631 through a torsion spring rod. A pressure roller 633 is fixedly installed on the end of the positioning rod 632 away from the circular pressure plate 622.

[0044] During specific operation, when the upper mold 612 descends, the circular pressure plate 622 first contacts the lower end surface of the metal barrel cover under the action of the spring slide rod 621, so as to always press the metal barrel cover into the lower mold 611, and the surrounding pressure rollers 633 will rotate outward with the torsion spring rod as the center point until no more rotation occurs. At this time, the expanded correction rod 632 will perform a second expansion and correction on the inside of the metal barrel cover to ensure that the gap between the metal barrel cover and the lower mold 611 is uniform, thereby optimizing the material distribution.

[0045] When the supporting circular plate 413 cannot continue to descend, the upper mold 612 descends, causing the circular pressing plate 622 to continue to squeeze and fix the metal barrel cover, thereby ensuring that the barrel cover maintains a stable position during the stamping process.

[0046] See also Figure 4 and Figure 6 The pre-bending portion 64 includes a limiting slide 641, a second slider 642, an expansion rod 643, an extrusion arc block 644 and a spinning cone block 645. A plurality of limiting slides 641 located below the upper arc groove 613 are provided on the outer ring wall of the upper mold 612 in a circumferential array. A second slider 642 is slidably installed in the limiting slide 641 through a second spring. An expansion rod 643 is fixedly installed on the second slider 642. An extrusion arc block 644 is fixedly installed at one end of the expansion rod 643 away from each other. A spinning cone block 645 located in the alignment groove is fixedly installed at the center of the upper end surface of the circular pressure plate 622. The pressing roller 633 and the extrusion arc block 644 are both coated with a rubber layer, and the end of the pressing roller 633 away from the circular pressure plate 622 is arc-shaped.

[0047] During specific operation, when the supporting circular plate 413 cannot continue to descend, the upper mold 612 continues to descend. At this time, the distance between the upper mold 612 and the circular pressure plate 622 is reduced. At this time, under the action of the second spring, the expansion rods 643 on all sides are close to the spinning cone block 645. In the process of the distance between the upper mold 612 and the circular pressure plate 622 continuously decreasing, the convex part of the spinning cone block 645 will squeeze the expansion rods 643 on all sides outward at the same time, and the expansion rods 643 expand the upper end of the vertical part of the metal barrel cover outward by squeezing the arc block 644, so that in the process of curling stamping, the metal barrel cover is pre-bent before curling to guide, which can better control the direction of material movement and make the curling more uniform.

[0048] When the upper mold 612 descends to the lowest point, the expansion rod 643 is located at the vertical position of the lower end of the spinning cone block 645, so that the expansion rods 643 on all sides return under the action of the second spring and no longer squeeze the vertical part of the metal barrel cover. When the curling stamping is completed, the hydraulic cylinder 511 is started in the reverse direction and after all parts are reset, the completed metal barrel cover is taken out, and the curling stamping of the next metal barrel cover can be carried out.

[0049] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic curling and punching device for packaging metal barrel covers, comprising a base (1), characterized in that: A U-shaped bracket (2) is fixedly installed on the upper end surface of the base (1). A support seat (3) is fixedly installed on the upper end surface of the base (1) and is located below the horizontal section of the U-shaped bracket (2). A loading mechanism (4) for loading a metal bucket lid is jointly arranged on the support seat (3) and the U-shaped bracket (2). The loading mechanism (4) includes a support part (41) arranged on the U-shaped bracket (2), and a connecting part (42) for elastically supporting the support part (41) is arranged on the support seat (3). A driving mechanism (5) is arranged on the U-shaped bracket (2), and an execution mechanism (6) for cooperating with the loading mechanism (4) to perform curling and stamping operations on the metal bucket lid in multiple segments is arranged on the driving mechanism (5). The driving mechanism (5) includes a driving part (51) arranged on the U-shaped bracket (2) to provide power for the execution mechanism (6), and a limiting part (52) for providing vertical limit for the execution mechanism (6) during the execution of operations is arranged on the support part (41). The execution mechanism (6) includes a curling and pressing part (61) arranged on the driving part (51). A flat pressing part (62) for squeezing and fixing the inside of the metal bucket lid in cooperation with the curling and stamping operation is arranged on the curling and pressing part (61). An alignment correction part (63) for expanding and correcting the position of the metal bucket lid in cooperation with the flat pressing part (62) is arranged on the flat pressing part (62). A pre-bending part (64) for pre-bending and guiding the inside of the metal bucket lid before curling in cooperation with the curling and stamping operation is also arranged on the curling and pressing part (61).

2. The automatic curling and punching device for packaging metal barrel cover according to claim 1, characterized in that: The support part (41) includes vertical slide rails (411), first sliders (412), and a support circular plate (413). Vertical slide rails (411) that are symmetrically arranged front and back and are located between the vertical sections of the U-shaped bracket (2) are fixedly installed on the upper end surface of the base (1). First sliders (412) are slidably installed in the vertical slide rails (411). A support circular plate (413) located directly above the support seat (3) is jointly fixedly installed between the front and back symmetric first sliders (412).

3. The automatic curling and punching device for packaging metal barrel cover according to claim 2 is characterized in that: The connecting part (42) includes first slide rods (421) and first springs (422). A plurality of first slide rods (421) are fixedly installed on the upper end surface of the support seat (3) in a circumferential array. First slide holes corresponding to the first slide rods (421) one by one are opened on the lower end surface of the support circular plate (413). First springs (422) sleeved on the first slide rods (421) are fixedly installed between the support circular plate (413) and the support seat (3).

4. The automatic curling and punching device for packaging metal barrel cover according to claim 1, characterized in that: The driving part (51) includes a hydraulic cylinder (511) and a support cross plate (512). A hydraulic cylinder (511) is fixedly installed on the horizontal section of the U-shaped bracket (2), and the telescopic end of the hydraulic cylinder (511) is fixedly installed with a support cross plate (512) located below the horizontal section of the U-shaped bracket (2).

5. The automatic curling and punching device for packaging metal barrel cover according to claim 2 is characterized in that: The limiting part (52) includes limiting columns (521). Limiting columns (521) that are symmetrically arranged front and back are fixedly installed on the upper end surface of the support circular plate (413), and the upper ends of the front and back symmetric limiting columns (521) slidably penetrate through the support cross plate (512).

6. The automatic curling and punching device for packaging metal barrel lid according to claim 2, characterized in that: The rolling and pressing part (61) comprises a lower mold (611), an upper mold (612), an upper arc groove (613) and a lower arc groove (614); an annular lower mold (611) is fixedly installed at the center of the upper end surface of the supporting circular plate (413); an upper mold (612) located directly above the lower mold (611) is fixedly installed at the lower end surface of the supporting horizontal plate (512); a positioning groove is provided at the center of the inner part of the upper mold (612); a circle of lower arc grooves (614) is provided at the upper end of the inner ring wall of the lower mold (611); an upper arc groove (613) cooperating with the lower arc groove (614) is provided on the upper mold (612); the upper arc groove (613) and the lower arc groove (614) are combined to form a cylindrical cavity with a ring-shaped cross section.

7. The automatic curling and punching device for packaging metal barrel cover according to claim 6, characterized in that: The flat pressing portion (62) comprises a spring slide bar (621) and a circular pressure plate (622); a plurality of spring slide bars (621) are fixedly mounted on the lower end surface of the upper mould (612) in a circular array; a circular pressure plate (622) located directly below the upper mould (612) is fixedly mounted on the lower ends of the plurality of spring slide bars (621).

8. The automatic curling and punching device for packaging metal barrel cover according to claim 7 is characterized in that: The correction part (63) comprises a groove (631), a correction rod (632) and a pressure roller (633); a plurality of grooves (631) are provided on the outer ring wall of the circular pressure plate (622) in a circumferential array; a correction rod (632) is rotatably installed in the groove (631) via a torsion spring rod; a pressure roller (633) is fixedly installed at one end of the correction rod (632) away from the circular pressure plate (622).

9. The automatic curling and punching device for packaging metal barrel lid according to claim 6, characterized in that: The pre-bending portion (64) includes a limiting slide (641), a second slider (642), an expansion rod (643), an extrusion arc block (644) and a spinning cone block (645). A plurality of limiting slides (641) located below the upper arc groove (613) are provided on the outer ring wall of the upper mold (612) in a circular array manner. The second slider (642) is slidably installed in the limiting slide (641) through a second spring. The expansion rod (643) is fixedly installed on the second slider (642). The extrusion arc block (644) is fixedly installed at the ends of the expansion rods (643) that are away from each other. A spinning cone block (645) located in the alignment groove is fixedly installed at the center of the upper end surface of the circular pressure plate (622).

10. The automatic curling and punching device for packaging metal barrel lid according to claim 8, characterized in that: The pressing roller (633) and the extrusion arc block (644) are both covered with a rubber layer, and the end of the pressing roller (633) away from the circular pressure plate (622) is arc-shaped.

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