Rotating disc type multi-station pull ring cover bending device

Abstract

The utility model discloses a rotating disc type multi-station pull ring cover bending device, and relates to the technical field of pull ring cover manufacturing. In the upper die mechanism, an upper rotating disc can rotate around the center shaft of the upper rotating disc, and a plurality of bending upper die assemblies are evenly arranged on the upper rotating disc in the circumferential direction of the center shaft of the upper rotating disc and can move up and down. In the lower die mechanism, a lower rotating disc can rotate around the center shaft of the lower rotating disc, the lower rotating disc and an upper rotating disc are coaxial and rotate in the same direction, and a plurality of bending lower die assemblies are evenly arranged on the lower rotating disc in the circumferential direction of the center shaft of the lower rotating disc and can move up and down. The lower rotating disc is provided with a plurality of machining stations capable of supporting the metal cover, the machining stations, the bending lower die assemblies and the bending upper die assemblies are in one-to-one correspondence, the bending upper die assemblies and the machining stations are vertically opposite, the bending lower die assemblies are located on one sides of the machining stations, the bending upper die assemblies can downwards press extending parts on the metal cover to the bending lower die assemblies, and the metal cover is bent. And the extending part is bent and shaped. The pull ring cover bending machine can finish bending processing work of pull ring cover semi-finished products with high efficiency and high quality.

Description

Technical Field

[0001] The utility model relates to the technical field of pull-tab lid manufacturing, and particularly relates to a rotary multi-station pull-tab lid bending device. Background Art

[0002] At present, the structure of a pull-tab lid includes a metal lid and a plastic pull tab. Among them, a flanging portion extends outward from the side wall of the metal lid, and the plastic pull tab is fixed on the flanging portion through an injection molding process. Since the pull-tab lid does not require a bottle opener during the opening process, it is very convenient and fast for people and has a good user experience. Therefore, the pull-tab lid is widely used in beverage products.

[0003] In the process of manufacturing a pull-tab lid, since the metal lid 100 needs to be riveted and fixed to the plastic pull tab in the last process to form a complete pull-tab lid finished product, a bending process is required to bend the protruding portion 110 on the side wall of the metal lid 100. By bending the protruding portion 110 at a certain angle to form a flanging portion, as Figure 2 shown, a pull-tab lid semi-finished product is produced, which is convenient for subsequently feeding the pull-tab lid semi-finished product into the mold cavity of a rubber pressing machine, so that the flanging portion of the metal lid 100 and the plastic pull tab are assembled into one body, and finally the manufacturing work of the pull-tab lid finished product is completed. Therefore, there is a current need for a pull-tab lid bending processing device to efficiently and stably process the flanging portion on the metal lid. Summary of the Utility Model

[0004] The utility model aims to at least solve one of the technical problems existing in the prior art. For this purpose, the utility model provides a rotary multi-station pull-tab lid bending device, which can efficiently and high-qualityly complete the bending processing of pull-tab lid semi-finished products.

[0005] An embodiment of the utility model provides a rotary multi-station pull-tab lid bending device, which includes:

[0006] An upper die mechanism, which includes an upper turntable and a bending upper die assembly. The upper turntable is configured to be able to rotate around its own central axis. A plurality of bending upper die assemblies are provided and are uniformly arranged on the upper turntable along the circumferential direction of the central axis of the upper turntable. The bending upper die assembly is configured to be able to move in the vertical direction;

[0007] A lower die mechanism, which includes a lower turntable and a bending lower die assembly. The lower turntable is configured to be able to rotate around its own central axis, is coaxially arranged with the upper turntable and rotates in the same direction. A plurality of bending lower die assemblies are provided and are uniformly arranged on the lower turntable along the circumferential direction of the central axis of the lower turntable. The bending lower die assembly is configured to be able to move in the vertical direction;

[0008] Among them, the lower turntable is provided with a plurality of processing stations for supporting the metal lid. The plurality of processing stations, the plurality of lower bending die assemblies, and the plurality of upper bending die assemblies correspond one by one. The upper bending die assembly and the processing station are arranged opposite to each other in the up-and-down direction. The lower bending die assembly is located on one side of the processing station. The upper bending die assembly is further configured to press down the protruding part on the metal lid to the lower bending die assembly to bend and shape the protruding part.

[0009] The rotary multi-station pull-tab lid bending device according to the embodiment of the present invention has at least the following beneficial effects: The lower turntable is provided with a plurality of processing stations. The plurality of upper bending die assemblies are arranged in a circle around the central axis of the upper turntable and are respectively arranged corresponding to the plurality of processing stations of the lower turntable in the up-and-down direction. The plurality of lower bending die assemblies are arranged in a circle around the central axis of the lower turntable. Each lower bending die assembly is located on one side of the corresponding processing station. During the rotation of the upper turntable and the lower turntable in the same direction, both the upper bending die assembly and the lower bending die assembly can move in the up-and-down direction. The upper bending die assembly can apply a pressing force to the protruding part of the metal lid located at the processing station, while the lower bending die assembly can apply a supporting force to the protruding part of the metal lid. Through the mutual cooperation of the upper bending die assembly and the lower bending die assembly, the bending and shaping work of the protruding part of the metal lid is completed with high quality to form a flanging part on the metal lid that can be connected to the plastic pull tab.

[0010] Since the rotary multi-station pull-tab lid bending device arranges a plurality of processing stations on the rotatable lower turntable, when the upper bending die assembly and the lower bending die assembly are far away from each other, the feeding work of the metal lid can be carried out at the unloaded processing station, and the metal lid that has completed the bending process can be unloaded, so as to efficiently realize the bending processing of the protruding part of the metal lid.

[0011] In some embodiments of the present invention, the upper bending die assembly includes an upper die head. The upper die head is provided with an insertion part and a bending part. The insertion part is configured to be inserted and in close contact with the inner peripheral side wall of the metal lid. The bending part is configured to press down the protruding part of the metal lid. The lower turntable is provided with a plurality of first limiting surfaces. The plurality of first limiting surfaces are arranged in the circumferential direction of the central axis of the lower turntable. The lower bending die assembly includes a lower die head. The lower die head is provided with a second limiting surface and a shaping surface. The second limiting surface is configured to cooperate with the first limiting surface to be in close contact with the outer peripheral side wall of the metal lid. The shaping surface is configured to cooperate with the bending part to bend and shape the protruding part of the metal lid.

[0012] In some embodiments of the present utility model, the upper die head is provided with a receiving cavity opening downward, and a first spring and a downward pressing head are arranged in the receiving cavity. One end of the first spring is connected to the upper die head, and the other end is connected to the downward pressing head. The first spring is configured to drive the downward pressing head to move downward relative to the upper die head and press against the inner bottom surface of the metal lid.

[0013] In some embodiments of the present utility model, the downward pressing head is in sliding contact with the wall surface of the receiving cavity, and the upper die head is provided with a limiting member configured to limit the up-and-down movement distance of the downward pressing head.

[0014] In some embodiments of the present utility model, the first limiting surface and the second limiting surface are arranged oppositely along the radial direction of the lower turntable, and the lower die head is located outside the processing station along the radial direction of the lower turntable.

[0015] In some embodiments of the present utility model, when the bending upper die assembly moves down in place and moves up in place, there is a uniform gap between the upper die head and the lower die head.

[0016] In some embodiments of the present utility model, the rotary multi-station pull-tab lid bending device further includes an upper die cam and a lower die cam. The bending upper die assembly further includes an upper sliding rod and an upper bearing. The lower end of the upper sliding rod is connected to the upper die head, and the upper bearing is rotatably arranged at the upper end of the upper sliding rod. The upper bearing is in rolling connection with the upper die cam, so that the upper bearing can perform a circular motion along the upper die cam and drive the upper sliding rod to move in the up-and-down direction; the bending lower die assembly further includes a lower sliding rod and a lower bearing. The upper end of the lower sliding rod is connected to the lower die head, and the lower bearing is rotatably arranged at the lower end of the lower sliding rod. The lower bearing is in rolling connection with the lower die cam, so that the lower bearing can perform a circular motion along the lower die cam and drive the lower sliding rod to move in the up-and-down direction.

[0017] In some embodiments of the present utility model, the rotary multi-station pull-tab lid bending device further includes an upper base, a lower base and a driving shaft. The driving shaft extends in the up-and-down direction and is rotatably connected to the upper base and the lower base. The upper turntable and the lower turntable are both fixedly connected to the driving shaft.

[0018] In some embodiments of the present utility model, the bending upper die assembly further includes a second spring sleeved on the upper sliding rod. The upper end of the second spring is connected to the upper turntable, and the lower end of the second spring is connected to the upper sliding rod; the bending lower die assembly further includes a third spring sleeved on the lower sliding rod. The upper end of the third spring is connected to the lower turntable, and the lower end of the third spring is connected to the lower sliding rod.

[0019] In some embodiments of the present utility model, the upper turntable is provided with an upper guiding hole, the upper sliding rod is slidably connected with the upper guiding hole in a matching manner, the lower turntable is provided with a lower guiding hole, and the lower sliding rod is slidably connected with the lower guiding hole in a matching manner.

[0020] Other features and advantages of the present utility model will be described in the following specification. Moreover, some of them will become obvious from the specification or be understood by implementing the present utility model. The objectives and other advantages of the present utility model can be achieved and obtained by the structures specifically pointed out in the specification, claims, and drawings. Description of the Drawings

[0021] Figure 1 is a schematic cross-sectional view of a rotary multi-station pull-tab lid bending device according to an embodiment of the present utility model;

[0022] Figure 2 is a schematic structural view of a metal lid in the prior art; wherein, Figure 2 (a) is a schematic view of the protruding part of the metal lid not being bent, Figure 2 and (b) is a schematic view of the protruding part of the metal lid being bent;

[0023] Figure 3 is a schematic view of the upper die head and the lower die head working in cooperation according to an embodiment of the present utility model;

[0024] Figure 4 is a schematic structural view of the upper die head according to an embodiment of the present utility model;

[0025] Figure 5 is a schematic structural view of the lower die head according to an embodiment of the present utility model;

[0026] Figure 6 is a schematic structural view of the connection between the lower turntable and the lower die head according to an embodiment of the present utility model;

[0027] Figure 7 is a schematic working view of a rotary multi-station pull-tab lid bending device according to an embodiment of the present utility model; wherein, Figure 7 (a) is a schematic view of pressing and positioning the metal lid during the bending process; Figure 7 and (b) is a schematic view of horizontally limiting the metal lid during the bending process; Figure 7 and (c) is a schematic view of starting to press and bend the metal lid during the bending process; Figure 7 and (d) is a schematic view of bending and shaping the protruding part of the metal lid during the bending process.

[0028] Reference numerals: 100, metal cover; 110, protruding part; 120, gasket; 200, upper die mechanism; 210, upper turntable; 220, upper sliding rod; 230, upper die head structure; 231, upper die head; 232, lower pressing head; 233, first spring; 234, accommodating cavity; 235, mounting hole; 236, extending part; 237, bending part; 240, upper bearing; 250, linear bearing; 260, second spring; 300, lower die mechanism; 310, lower turntable; 320, lower sliding rod; 330, lower die head structure; 331, lower die head; 332, shaping surface; 333, second limiting surface; 340, lower bearing; 350, third spring; 360, limiting plate; 361, first limiting surface; 410, driving shaft; 420, upper base; 430, lower base; 510, upper die cam; 520, lower die cam. Detailed implementation manners

[0029] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0030] In the description of the present invention, it should be understood that the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0031] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "connected" and "connected to" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations. Figure 6 and Figure 7 The arrow direction in

[0032] Below, reference is made to Figures 1 to 7 Describe a rotary multi-station pull-tab cover bending device according to an embodiment of the present invention.

[0033] As Figures 1 to 7As shown, the rotary multi-station pull-tab lid bending device according to the embodiments of the present utility model can be applied to the production and processing of pull-tab lids, and can efficiently and high-qualityly complete the bending processing of pull-tab lid semi-finished products, thereby facilitating the subsequent good assembly of the pull-tab lid semi-finished products and plastic pull-tabs.

[0034] The rotary multi-station pull-tab lid bending device includes an upper die mechanism 200 and a lower die mechanism 300. The upper die mechanism 200 includes an upper turntable 210 and a bending upper die assembly. The lower die mechanism 300 includes a lower turntable 310 and a bending lower die assembly.

[0035] Among them, the upper turntable 210 is configured to be able to rotate around its own central axis, and the central axis of the upper turntable 210 extends in the up and down direction. The lower turntable 310 is configured to be able to rotate around its own central axis, the lower turntable 310 is located directly below the upper turntable 210, and the lower turntable 310 and the upper turntable 210 are coaxially arranged, that is, the central axes of the upper turntable 210 and the lower turntable 310 coincide. The lower turntable 310 and the upper turntable 210 rotate in the same direction, such as rotating clockwise or counterclockwise. In this embodiment, both the lower turntable 310 and the upper turntable 210 rotate clockwise.

[0036] It can be understood that the upper turntable 210 and the lower turntable 310 can be driven to rotate through a combination of a rotation driving mechanism such as a motor and a transmission structure. The shapes of the upper turntable 210 and the lower turntable 310 can be set according to the actual situation, and no specific limitation is made here. Both the upper turntable 210 and the lower turntable 310 are rigid body structures.

[0037] There are multiple bending upper die assemblies, and multiple bending upper die assemblies are all arranged on the upper turntable 210, and each bending upper die assembly can rotate together with the upper turntable 210. Moreover, the multiple bending upper die assemblies are evenly arranged along the circumferential direction of the central axis of the upper turntable 210, and the bending upper die assemblies are configured to be able to move linearly in the up and down direction relative to the upper turntable 210.

[0038] There are multiple bending lower die assemblies, and multiple bending lower die assemblies are all arranged on the lower turntable 310, and each bending lower die assembly can rotate together with the lower turntable 310. Moreover, the multiple bending upper die assemblies are evenly arranged along the circumferential direction of the central axis of the lower turntable 310, and the bending lower die assemblies are configured to be able to move linearly in the up and down direction relative to the lower turntable 310.

[0039] Moreover, the lower turntable 310 is provided with multiple processing stations, and the processing stations are located in the upper part of the lower turntable 310. The processing stations can be used to support the metal lid 100. Therefore, the metal lid 100 to be bent can be accurately placed on the processing stations through manual feeding or automated feeding methods. Then, the metal lid 100 can rotate together with the lower turntable 310.

[0040] It is understandable that the metal cap 100 can be an aluminum cap, and the diameter of the metal cap 100 can be 26 mm, 38 mm, etc. A vertically extending protrusion 110 is formed on the side wall of the metal cap 100. As Figure 2 shown in (a), since the protrusion 110 of the metal cap 100 needs to be fixedly connected to the plastic pull ring through an injection molding process, before injection molding, the protrusion 110 of the metal cap 100 is bent outward, as Figure 2 shown in (b). The bending angle can be set according to actual processing needs and is not specifically limited here.

[0041] The number of multiple processing stations, multiple lower bending die assemblies, and multiple upper bending die assemblies corresponds one by one. In this embodiment, the number of lower bending die assemblies is 24, the number of lower bending die assemblies is 24, and the number of processing stations is also 24. Moreover, the upper bending die assembly and the processing station are arranged vertically opposite to each other. The upper bending die assembly is located above the processing station, and the lower bending die assembly is located on one side of the processing station. For example, the lower bending die assembly can be arranged on the side of the processing station far from the central axis of the lower turntable 310, or can be arranged on the side of the processing station close to the central axis of the lower turntable 310.

[0042] The upper bending die assembly is also configured to be able to press down the protrusion 110 on the metal cap 100 to the lower bending die assembly to bend and shape the protrusion 110. Specifically, the upper bending die assembly can exert a pressing force on the protrusion 110 of the metal cap 100 located at the processing station during the downward movement to bend the protrusion 110 outward. Moreover, the lower bending die assembly can exert a supporting force on the protrusion 110 of the metal cap 100 during the bending process. With the cooperation of the upper bending die assembly and the lower bending die assembly, the protrusion 110 of the metal cap 100 can be bent into a set angle to form a flanging portion, which is convenient for subsequent assembly of the flanging portion of the metal cap 100 and the plastic pull ring.

[0043] Specifically, the upper bending die assembly includes an upper die head 231, as Figure 1 、 Figure 3 and Figure 4As shown, the upper die head 231 is provided with an insertion part 236 and a bending part 237. The bending part 237 is located above the insertion part 236. Among them, the insertion part 236 is configured to be able to insert downward into the groove of the metal cover 100 and fit and contact the inner peripheral side wall of the metal cover 100. A guiding surface is provided at the lower end of the insertion part 236 so that the insertion part 236 can smoothly and accurately insert into the groove of the metal cover 100. The shape of the insertion part 236 matches the shape of the groove of the metal cover 100. The function of the insertion part 236 is to apply a certain limiting effect on the inner circle of the metal cover 100 to avoid the situation of the inner concave deformation of the metal cover 100 during the bending treatment process.

[0044] The bending part 237 is configured to be able to apply a downward pressing force on the protruding part 110 of the metal cover 100. The bending part 237 has a bending inclined surface. The bending inclined surface is arranged vertically opposite to the protruding part 110 of the metal cover 100 located at the processing station. The bending inclined surface is inclined upward along the direction from the inside to the outside of the central axis of the upper die head 231. The central axis of the upper die head 231 extends in the vertical direction. During the process of the upper die head 231 moving downward, the bending part 237 contacts the protruding part 110 of the metal cover 100 through the bending inclined surface to gradually press down the protruding part 110, prompting the protruding part 110 to gradually bend outward, and realizing the bending of the protruding part 110 of the metal cover 100 into a flanging part.

[0045] Moreover, as Figure 1 and Figure 6 shown, the lower turntable 310 is provided with a plurality of first limiting surfaces 361. The plurality of first limiting surfaces 361 are evenly arranged along the circumferential direction of the central axis of the lower turntable 310. In this embodiment, the lower turntable 310 is provided with a limiting plate 360. Looking along the vertical direction, the limiting plate 360 can be a circular ring-shaped plate. The limiting plate 360 is located above the lower turntable 310. The limiting plate 360 is coaxially arranged with and fixedly connected to the lower turntable 310. The limiting plate 360 can rotate with the rotation of the lower turntable 310. A plurality of first notches are provided on the outer peripheral surface of the limiting plate 360. The plurality of first notches are arranged in a circumferential pattern around the central axis of the limiting plate 360. Each first notch has a first concave arc surface, and the first concave arc surface is set as the first limiting surface 361. The central angle of the first limiting surface 361 is less than or equal to 90°. The first limiting surface 361 is located on one side of the processing station.

[0046] The bending lower die assembly includes a lower die head 331, as Figure 1 、 Figure 3 、 Figure 5 and Figure 6As shown, the lower die head 331 is provided with a second limiting surface 333 and a shaping surface 332. The shaping surface 332 is located above the second limiting surface 333. Among them, the second limiting surface 333 is configured to cooperate with the first limiting surface 361 to be in close contact with the outer peripheral side wall of the metal cover 100. The shaping surface 332 is configured to cooperate with the bending part 237 to bend and shape the protruding part 110 of the metal cover 100.

[0047] In this embodiment, a second notch is provided on one side of the lower die head 331 close to the processing station. The second notch has a second concave arc surface, and the second concave arc surface is set as the second limiting surface 333. The central angle of the second limiting surface 333 is less than 90°. The first limiting surface 361 and the second limiting surface 333 are set according to the outer diameter of the metal cover 100, so that both the first limiting surface 361 and the second limiting surface 333 can be in close contact with the outer peripheral surface of the metal cover 100 located at the processing station. The functions of the first limiting surface 361 and the second limiting surface 333 are to apply a certain limiting effect to the outer circle of the metal cover 100, play a role in positioning and wrapping protection, and avoid the situation of outer concave deformation of the metal cover 100 during the bending treatment process.

[0048] The first limiting surface 361 and the second limiting surface 333 are respectively located on opposite sides of the processing station. In this embodiment, the first limiting surface 361 and the second limiting surface 333 are arranged oppositely along the radial direction of the lower turntable 310. The first limiting surface 361 is located inside along the radial direction of the lower turntable 310 at the processing station, and the lower die head 331 is located outside along the radial direction of the lower turntable 310 at the processing station. It can be understood that when the lower die head 331 moves down to the position, the height position of the lower die head 331 is flush with or lower than the processing station, which is convenient for taking and placing the metal cover 100 from the outside of the processing station.

[0049] The shaping surface 332 matches the bending inclined surface of the bending part 237, and the shaping surface 332 is inclined upward along the direction from the side of the lower die head 331 close to the processing station to the side of the lower die head 331 far from the processing station. In this embodiment, the shaping surface 332 is a concave arc surface, and the bending inclined surface of the bending part 237 is a convex arc surface. During the process of bending the protruding part 110 of the metal cover 100, the bending inclined surface of the bending part 237 presses the protruding part 110 onto the shaping surface 332. Through the cooperation of the bending inclined surface and the shaping surface 332, the protruding part 110 is pressed and shaped, and the protruding part 110 is bent into a flanging part.

[0050] Further, as Figure 3As shown in the figure, the upper die head 231 is provided with a receiving cavity 234. The opening of the receiving cavity 234 is open downward. A first spring 233 and a downward pressing head 232 are arranged in the receiving cavity 234. The receiving cavity 234 can be a cylindrical cavity capable of accommodating the first spring 233 and the downward pressing head 232. Wherein, one end of the first spring 233 is connected to the upper die head 231, and the opposite end of the first spring 233 is connected to the downward pressing head 232. Moreover, the first spring 233 is configured to drive the downward pressing head 232 to move downward relative to the upper die head 231 and press against the inner bottom surface of the metal cover 100. The downward pressing head 232 can move up and down along with the upper die head 231. The downward pressing head 232 and the upper die head 231 are coaxially arranged, and the lower surface of the downward pressing head 232 can be a horizontal plane, which can well press against the inner bottom surface of the metal cover 100.

[0051] It can be understood that under the elastic force of the first spring 233, the downward pressing head 232 can protrude out of the receiving cavity 234 by a set distance. Then, during the downward movement of the upper die head 231, the downward pressing head 232 will first contact the inner bottom surface of the metal cover 100 or the gasket 120 (i.e., plastic gasket) on the inner bottom surface of the metal cover 100 and exert a certain pressure, so that the metal cover 100 can maintain a stationary state during its rotation with the lower turntable 310. Therefore, the downward pressing head 232 can play a role in positioning the position and angular orientation of the metal cover 100, thereby avoiding the situation that the protruding portion 110 of the metal cover 100 is displaced due to the change of the position and angular orientation of the metal cover 100, and further reducing the bending effect.

[0052] Specifically, the downward pressing head 232 is in sliding contact with the wall surface of the receiving cavity 234, so that the downward pressing head 232 can move up and down relative to the upper die head 231 stably. The downward pressing head 232 is provided with a receiving groove. The opening of the receiving groove is open upward. The upper end of the first spring 233 abuts against the inner upper wall surface of the receiving cavity 234. The first spring 233 extends into the receiving groove, and the lower end of the first spring 233 abuts against the inner bottom surface of the receiving groove.

[0053] In addition, the upper die head 231 is provided with a limiting member, and the limiting member is configured to limit the up and down movement distance of the downward pressing head 232. In this embodiment, the limiting member is a screw. The upper die head 231 is provided with a mounting hole 235, and the screw can be arranged at the mounting hole 235 so that the screw is threadedly connected to the upper die head 231. Correspondingly, the downward pressing head 232 is provided with a limiting groove, and the limiting groove extends in the up and down direction. The opening of the limiting groove faces the mounting hole 235 and is open, so that the end of the screw can extend into the limiting groove.

[0054] In this embodiment, the upper die head 231 is fixed to the upper slide bar 220 by screws, and the upper die head 231, the lower pressure head 232, the first spring 233, the limiter and the screws together constitute the upper die head structure 230, and the lower die head 331 is fixed to the lower slide bar 320 by screws, and the lower die head 331 and the screws together constitute the lower die head structure 330.

[0055] When the lower press head 232 moves downwardly into position relative to the upper die head 231 due to the elastic force of the first spring 233, the end of the screw will contact and limit the upper side surface of the limiting groove, preventing the lower press head 232 from continuing to move downward and preventing the lower press head 232 from escaping from the accommodating cavity 234 of the upper die head 231, thereby maintaining the connection relationship between the lower press head 232 and the upper die head 231; when the lower press head 232 moves upwardly into position relative to the upper die head 231 under the action of external force, the end of the screw will contact and limit the lower side surface of the limiting groove, preventing the lower press head 232 from continuing to move upward.

[0056] In some embodiments, when the upper bending die assembly moves down to the position and the upper bending die assembly moves up to the position, there is a uniform gap between the upper die head 231 and the lower die head 331. It is understandable that when the upper bending die assembly reaches the lowest point and the lower bending die assembly reaches the highest point, a uniform gap, such as 0.2 mm to 0.5 mm, must be retained between the upper die head 231 and the lower die head 331, so as to prevent the upper bending die assembly and the lower bending die assembly from being stuck to each other, thereby causing damage to the parts of the turntable multi-station pull ring cover bending device.

[0057] In some embodiments, Figure 1 As shown, the turntable multi-station pull-ring cover bending device also includes an upper die cam 510 and a lower die cam 520.

[0058] The bending upper die assembly also includes an upper slide bar 220 and an upper bearing 240. The lower end of the upper slide bar 220 is fixedly connected to the upper die head 231, the upper die head 231 and the upper slide bar 220 are coaxially arranged, and the upper bearing 240 is rotatably arranged at the upper end of the upper slide bar 220. The upper bearing 240 is installed on the upper slide bar 220 through a rotating shaft, so that the upper bearing 240 can rotate relative to the upper slide bar 220, and the rotation axis of the upper bearing 240 is perpendicular to the up-down direction. Moreover, the upper bearing 240 is rollingly connected with the upper die cam 510, so that the upper bearing 240 can make a circular motion along the upper die cam 510 and drive the upper slide bar 220 to move in the up-down direction.

[0059] The bending lower die assembly further includes a lower sliding rod 320 and a lower bearing 340. Among them, the upper end of the lower sliding rod 320 is fixedly connected to the lower die head 331. The lower die head 331 and the lower sliding rod 320 are coaxially arranged. The lower bearing 340 is rotatably arranged at the lower end of the lower sliding rod 320. The lower bearing 340 is installed on the lower sliding rod 320 through a rotating shaft, so that the lower bearing 340 can rotate relative to the lower sliding rod 320. The rotation axis of the lower bearing 340 is perpendicular to the up-down direction. Moreover, the lower bearing 340 is in rolling connection with the lower die cam 520, so that the lower bearing 340 can perform a circular motion along the lower die cam 520 and drive the lower sliding rod 320 to move along the up-down direction.

[0060] In this embodiment, the upper turntable 210 is provided with an upper guiding hole. The upper guiding hole is a circular hole. The central axis of the upper guiding hole extends along the up-down direction. The upper sliding rod 220 is in sliding connection with the upper guiding hole, so that the upper sliding rod 220 can stably lift relative to the upper turntable 210. The upper sliding rod 220 is installed on the upper turntable 210 through a linear bearing 250. The lower turntable 310 is provided with a lower guiding hole. The lower guiding hole is a circular hole. The central axis of the lower guiding hole extends along the up-down direction. The lower sliding rod 320 is in sliding connection with the lower guiding hole, so that the lower sliding rod 320 can smoothly lift relative to the lower turntable 310. The upper sliding rod 220, the upper die head 231, the lower sliding rod 320, and the lower die head 331 are all of rigid body structures.

[0061] In addition, when viewed along the up-down direction, both the upper die cam 510 and the lower die cam 520 are in an annular shape. Both the upper die cam 510 and the lower die cam 520 provide corresponding movement tracks. During the rotation of the upper turntable 210 driving the upper sliding rod 220, the upper die head 231, and the upper bearing 240, the upper bearing 240 can roll along the movement track of the upper die cam 510. Since the movement track of the upper die cam 510 is curve-shaped and undulating, during the rolling of the upper bearing 240, the upper bearing 240 can drive the upper sliding rod 220 and the upper die head 231 to move up and down. During the rotation of the lower turntable 310 driving the lower sliding rod 320, the lower die head 331, and the lower bearing 340, the lower bearing 340 can roll along the movement track of the lower die cam 520. Since the movement track of the lower die cam 520 is curve-shaped and undulating, during the rolling of the lower bearing 340, the lower bearing 340 can drive the lower sliding rod 320 and the lower die head 331 to move up and down.

[0062] It can be understood that during the rotation of the upper turntable 210 and the lower turntable 310, the upper die cam 510 and the lower die cam 520 always remain stationary. Through the matching of the lifting action timing and the adjustment of the gap between the bending upper die assembly and the bending lower die assembly, the bending process of the protruding portion 110 of the metal cover 100 is realized when the upper die head 231 and the lower die head 331 approach each other.

[0063] Further, as Figure 1 shown, the bending upper die assembly further includes a second spring 260. The second spring 260 is sleeved on the upper sliding rod 220. The upper end of the second spring 260 is connected to the upper turntable 210, and the lower end of the second spring 260 is connected to the upper sliding rod 220. When the upper sliding rod 220 moves upward relative to the upper turntable 210, the second spring 260 will be subjected to the pressure exerted by the upper sliding rod 220 and be in a compressed state, enabling the upper sliding rod 220 to rise slowly and avoiding strong collision between the upper die head 231 and the upper turntable 210. When the upper sliding rod 220 moves downward relative to the upper turntable 210, the second spring 260 will exert a downward elastic force on the upper sliding rod 220, causing the upper die head 231 to exert a certain downward pressing force on the metal lid 100.

[0064] The bending lower die assembly further includes a third spring 350. The third spring 350 is sleeved on the lower sliding rod 320. The upper end of the third spring 350 is connected to the lower turntable 310, and the lower end of the third spring 350 is connected to the lower sliding rod 320. When the lower sliding rod 320 moves upward relative to the lower turntable 310, the third spring 350 will be subjected to the pressure exerted by the lower sliding rod 320 and be in a compressed state, enabling the lower sliding rod 320 to move upward slowly and avoiding strong collision between the lower die head 331 and the metal lid 100, which may affect the bending effect. When the lower sliding rod 320 moves downward relative to the lower turntable 310, the third spring 350 will exert a downward elastic force on the lower sliding rod 320, causing the lower die head 331 to move downward quickly and creating enough space to facilitate the removal of the bent metal lid 100.

[0065] Further, as Figure 1 shown, the rotary multi-station pull-ring lid bending device further includes an upper base 420, a lower base 430 and a drive shaft 410.

[0066] Among them, the upper base 420 is located above the upper turntable 210, and the upper die cam 510 is installed on the upper base 420. The lower base 430 is located below the lower turntable 310, and the lower die cam 520 is installed on the lower base 430. Both the upper base 420 and the lower base 430 are fixed. The length of the drive shaft 410 extends along the vertical direction. Moreover, the drive shaft 410 is rotationally connected to the upper base 420 and the lower base 430 respectively through a bearing installation method. The upper turntable 210 and the lower turntable 310 can be fixedly connected to the drive shaft 410 through a key connection method. The upper turntable 210 and the lower turntable 310 can rotate synchronously with the drive shaft 410, and the upper turntable 210 and the lower turntable 310 can be fixedly connected by screws. The drive shaft 410 can be driven to rotate by a rotary driving member such as a motor and a transmission structure. The transmission structure can be a gear transmission structure or a reducer or a coupling, etc.

[0067] During the rotation of the drive shaft 410 about its central axis, the drive shaft 410 can simultaneously drive the upper turntable 210, the bending upper die assembly, the lower turntable 310, and the bending lower die assembly to rotate relative to the upper base 420 and the lower base 430. During this rotation process, through the cooperation between the upper bearing 240 and the upper die cam 510 and the cooperation between the lower bearing 340 and the lower die cam 520, the upper die head 231 and the lower die head 331 can be lifted and lowered, and through the cooperation of the upper die head 231 and the lower die head 331, the bending and shaping of the protruding portion 110 of the metal lid 100 is completed.

[0068] As Figure 1 , Figure 3 , Figure 6 and Figure 7 shown, the working process of the rotary multi-station pull-ring lid bending device is as follows: When the metal lid 100 enters the space between the bending upper die assembly and the bending lower die assembly and is sent to one of the processing stations on the lower turntable 310, the bending upper die assembly will first move down a certain distance, so that the pressing head 232 in the upper die head structure 230 can press the inner bottom surface of the metal lid 100 to ensure that the metal lid 100 remains stationary during the rotary transportation. At this time, the extending portion 236 of the upper die head 231 does not insert into the groove of the metal lid 100, and the bending portion 237 of the upper die head 231 is located above the protruding portion 110 of the metal lid 100.

[0069] Next, as Figure 7 (a) shown, the bending lower die assembly will start to move up. At this time, the height position of the bending upper die assembly remains unchanged. During the upward movement of the lower die head 331, the second limiting surface 333 of the lower die head 331 will support the outer circle of the metal lid 100, and the second limiting surface 333 and the first limiting surface 361 can cooperate with each other to play a role in positioning and wrapping protection for the outer circle of the metal lid 100. At this time, since the metal lid 100 is subjected to the pressure applied by the pressing head 232, during the upward movement of the lower die head 331 and the contact with the outer peripheral wall surface of the metal lid 100, the metal lid 100 can remain stationary to prevent the metal lid 100 from being driven up by the lower die head 331.

[0070] Then, as Figure 7 (b) shown, after the bending lower die assembly moves up a certain distance, the bending upper die assembly starts to descend, and at the same time, the bending lower die assembly continues to move up. During this process, the pressing head 232 remains in contact with the inner bottom surface of the metal lid 100, and the upper die head 231 will move downward relative to the pressing head 232, that is, the pressing head 232 will contract into the accommodating cavity 234, which will cause the compression degree of the first spring 233 to increase. Then, the pressing effect of the pressing head 232 on the metal lid 100 is enhanced to ensure that the metal lid 100 still remains stationary.

[0071] When the bending lower die assembly rises to the highest point, the bending lower die assembly stops rising and remains stationary. As shown in Figure 7 Figure (c), at this time, the bending upper die assembly continues to move downward, so that the insertion part 236 of the upper die head 231 is inserted into the groove of the metal cover 100. Moreover, the bending part 237 of the upper die head 231 begins to apply a certain downward bending force to the protruding part 110 of the metal cover 100 to press the protruding part 110 onto the shaping surface 332 of the lower die head 331.

[0072] When the bending upper die assembly moves down to the lowest point and the bending lower die assembly moves up to the highest point, as shown in Figure 7 Figure (d), the protruding part 110 of the metal cover 100 is forced to bend at a certain angle, and the bending angle is jointly determined by the bending part 237 of the upper die head 231 and the shaping surface 332 of the lower die head 331. Immediately afterwards, the bending upper die assembly and the bending lower die assembly remain coincident for a certain period of time, and can perform good pressure holding and shaping treatment on the bent protruding part 110 of the metal cover 100.

[0073] After the pressure holding and shaping treatment is completed, the bending lower die assembly moves downward first, and then the bending upper die assembly rises. During this process, the pressing head 232 extends out of the accommodating cavity 234 under the elastic force of the first spring 233, playing a role in separating from the metal cover 100, making it easier to separate between the metal cover 100 and the insertion part 236 of the upper die head 231, and between the protruding part 110 and the bending part 237 of the upper die head 231, facilitating the subsequent blanking work of the metal cover 100.

[0074] When the bending upper die assembly moves up to the highest point and the bending lower die assembly moves down to the lowest point, the space between the bending upper die assembly and the bending lower die assembly reaches the maximum, which can create enough space for the blanking and loading work of the metal cover 100.

[0075] The rotary multi-station pull-ring cover bending device provided by the embodiment of the present utility model has the advantages of being practical and convenient, good bending effect and high speed, and can be applied to the large-scale bending production work of aluminum covers. Moreover, with the unique structure of the multi-station rotary table, the feeding work, bending work, pressure holding and shaping work of the metal cover 100, and the blanking work of the metal cover 100 can be carried out at the same time at different angular positions of the lower turntable 310 and are independent of each other, which helps to improve the bending work speed.

[0076] When using the turntable-type multi-station pull-tab lid bending device provided by the embodiments of the present utility model, since the lower turntable 310 is provided with multiple processing stations, multiple bending upper die assemblies are arranged in a circle around the central axis of the upper turntable 210 and are respectively arranged corresponding to the multiple processing stations of the lower turntable 310 in the up-down direction, and multiple bending lower die assemblies are arranged in a circle around the central axis of the lower turntable 310, and each bending lower die assembly is located on one side of the corresponding processing station. Therefore, during the rotation of the upper turntable 210 and the lower turntable 310 in the same direction, both the bending upper die assemblies and the bending lower die assemblies can move in the up-down direction. Among them, the bending upper die assemblies can apply a downward pressure on the protruding part 110 of the metal lid 100 located at the processing station, while the bending lower die assemblies can apply a supporting effect on the protruding part 110 of the metal lid 100. Through the mutual cooperation of the bending upper die assemblies and the bending lower die assemblies, the bending and shaping work of the protruding part 110 of the metal lid 100 is completed with high quality, so as to form a flanging part on the metal lid 100 that can be connected to the plastic pull tab.

[0077] Since the turntable-type multi-station pull-tab lid bending device arranges multiple processing stations on the rotatable lower turntable 310, when the bending upper die assemblies and the bending lower die assemblies move away from each other, the feeding work of the metal lid 100 can be carried out at the unloaded processing station, and the metal lid 100 that has completed the bending process can be discharged, so as to efficiently realize the bending process of the protruding part 110 of the metal lid 100.

[0078] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0079] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and purpose of the present utility model, and the scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A rotary multi-station pull-tab lid bending device, characterized in that Comprising: An upper die mechanism, which includes an upper turntable and a bending upper die assembly. The upper turntable is configured to be rotatable around its own central axis. A plurality of the bending upper die assemblies are provided and are uniformly arranged on the upper turntable along the circumferential direction of the central axis of the upper turntable. The bending upper die assembly is configured to be movable in the up and down direction; A lower die mechanism, which includes a lower turntable and a bending lower die assembly. The lower turntable is configured to be rotatable around its own central axis, is coaxially arranged with the upper turntable and rotates in the same direction. A plurality of the bending lower die assemblies are provided and are uniformly arranged on the lower turntable along the circumferential direction of the central axis of the lower turntable. The bending lower die assembly is configured to be movable in the up and down direction; Wherein, the lower turntable is provided with a plurality of processing stations for supporting the metal cover. The plurality of processing stations, the plurality of bending lower die assemblies and the plurality of bending upper die assemblies are in one-to-one correspondence. And the bending upper die assembly and the processing station are arranged opposite to each other in the up and down direction. The bending lower die assembly is located on one side of the processing station. The bending upper die assembly is further configured to be able to press down the protruding part on the metal cover to the bending lower die assembly to bend and shape the protruding part.

2. The rotary multi-station pull-tab lid bending device according to claim 1, characterized in that, The bending upper die assembly includes an upper die head. The upper die head is provided with an insertion part and a bending part. The insertion part is configured to be able to insert and fit in contact with the inner circumferential side wall of the metal cover. The bending part is configured to be able to press down the protruding part of the metal cover; The lower turntable is provided with a plurality of first limiting surfaces. The plurality of first limiting surfaces are arranged along the circumferential direction of the central axis of the lower turntable. The bending lower die assembly includes a lower die head. The lower die head is provided with a second limiting surface and a shaping surface. The second limiting surface is configured to be able to cooperate with the first limiting surface to fit in contact with the outer circumferential side wall of the metal cover. The shaping surface is configured to be able to cooperate with the bending part to bend and shape the protruding part of the metal cover.

3. The rotary multi-station pull-tab lid bending device according to claim 2, wherein, The upper die head is provided with a receiving cavity with an opening facing downwards. A first spring and a pressing head are arranged in the receiving cavity. One end of the first spring is connected to the upper die head, and the other end is connected to the pressing head. The first spring is configured to be able to drive the pressing head to move downwards relative to the upper die head and press against the inner bottom surface of the metal cover.

4. The rotary multi-station pull-tab lid bending device according to claim 3, characterized in that, The pressing head is in sliding contact with the wall surface of the receiving cavity. The upper die head is provided with a limiting member. The limiting member is configured to be able to limit the up and down movement distance of the pressing head.

5. The rotary multi-station pull-tab lid bending device according to claim 2, wherein The first limiting surface and the second limiting surface are arranged opposite to each other along the radial direction of the lower turntable. The lower die head is located on the outer side of the processing station along the radial direction of the lower turntable.

6. The rotary multi-station pull-tab lid bending device according to claim 2, characterized in that, When the bending upper die assembly moves down to the in-place position and moves up to the in-place position, there is a uniform gap between the upper die head and the lower die head.

7. The rotary multi-station pull-tab lid bending device according to any one of claims 2 to 6, characterized in that It further includes an upper die cam and a lower die cam. The bending upper die assembly further includes an upper sliding rod and an upper bearing. The lower end of the upper sliding rod is connected to the upper die head. The upper bearing is rotatably arranged at the upper end of the upper sliding rod. The upper bearing is in rolling connection with the upper die cam, so that the upper bearing can perform a circular motion along the upper die cam and drive the upper sliding rod to move in the up and down direction. The bending lower die assembly further includes a lower sliding rod and a lower bearing. The upper end of the lower sliding rod is connected to the lower die head. The lower bearing is rotatably arranged at the lower end of the lower sliding rod. The lower bearing is in rolling connection with the lower die cam, so that the lower bearing can perform a circular motion along the lower die cam and drive the lower sliding rod to move in the up and down direction.

8. The rotary multi-station pull-tab lid bending device according to claim 7, characterized in that, It further includes an upper base, a lower base and a driving shaft. The driving shaft extends in the up and down direction and is rotatably connected to the upper base and the lower base. Both the upper turntable and the lower turntable are fixedly connected to the driving shaft.

9. The rotary multi-station pull-tab lid bending device according to claim 7, characterized in that, The bending upper die assembly further includes a second spring. The second spring is sleeved on the upper sliding rod. The upper end of the second spring is connected to the upper turntable, and the lower end of the second spring is connected to the upper sliding rod. The bending lower die assembly further includes a third spring. The third spring is sleeved on the lower sliding rod. The upper end of the third spring is connected to the lower turntable, and the lower end of the third spring is connected to the lower sliding rod.

10. The rotary multi-station pull-tab lid bending device according to claim 7, characterized in that, The upper turntable is provided with an upper guiding hole, and the upper sliding rod is in sliding connection with the upper guiding hole in a matching manner. The lower turntable is provided with a lower guiding hole, and the lower sliding rod is in sliding connection with the lower guiding hole in a matching manner.

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