An inner flange device for a metal container

Abstract

The utility model discloses a kind of inner flanging devices of metal container, including rack, cylindrical mould, rotating drive mechanism capable of driving cylindrical mould rotation about axis, first mobile seat, first mobile drive mechanism capable of driving first mobile seat movement, second mobile seat, second mobile drive mechanism capable of driving second mobile seat movement, limit roller, progressive flanging wheel and shaping flanging wheel, rotating drive mechanism is installed on rack, first mobile drive mechanism is installed on rack, limit roller rotatable installation is on first mobile seat, and limit roller is parallel with the axis of cylindrical mould;Second mobile drive mechanism is installed on rack or first mobile seat, progressive flanging wheel and shaping flanging wheel rotatable installation is respectively on second mobile seat.This kind of inner flanging device can reduce stress concentration and deformation at flanging, improve structural stability and appearance flatness, adapt to multiple material specifications, improve product quality and pass rate.

Description

Technical Field

[0001] This utility model relates to a folding machine, and more particularly to an inner folding device for a metal container. Background Technology

[0002] In the production of cylindrical metal containers, the edge-folding process is crucial, requiring the upper edge of the container to be bent from vertical to horizontal to improve structural stability, safety, and surface smoothness. For example, a metal cylinder edge-folding device disclosed in CN102553997A (published on July 11, 2012) includes a frame and a controller. The frame is equipped with a bending table, a fixed pressure roller, and a moving pressure roller. The frame contains a rotary drive, a lifting drive, and a moving pressure roller drive. One end of the bending table is rotatably fixed to the frame, and the bottom of the bending table is connected to the lifting drive. The bending table has a cylindrical support ring and a main shaft; the cylindrical support ring is connected to the main shaft. The rotary drive... The bending table is fixed to the bottom and connected to the main shaft drive. The fixed pressure roller is fixed on the frame. The bending table has a notch at the end connected to the frame, through which the fixed pressure roller passes. The side of the fixed pressure roller near the connection between the bending table and the frame is directly below the outer side of the cylindrical support ring. The frame has a moving pressure roller groove. One end of the moving pressure roller groove is close to the fixed pressure roller. The moving pressure roller is movably fixed on the frame and passes through the moving pressure roller groove. The moving pressure roller is connected to the moving pressure roller drive drive. This bending device rotates the metal cylinder through the bending table during bending, applying a one-time bending force to the bending section of the metal cylinder, causing it to flip directly from the vertical direction to the horizontal direction. Although this method simplifies the equipment and operation, it has many defects in actual production, which has a significant impact on product quality and pass rate.

[0003] First, direct bending in a single operation can easily lead to excessive plastic deformation and stress concentration at the bend. The instantaneous large bending force causes severe grain distortion at the bend, and the stress cannot be released. This not only reduces the material's impact resistance, fatigue strength, and other mechanical properties, but also makes it prone to cracking and breakage in subsequent processes, affecting the container's lifespan and safety.

[0004] Secondly, it is difficult to guarantee the appearance quality and flatness of the bend. The contact area of ​​the folding wheel is small and the instantaneous force is large, which can easily lead to defects such as wrinkles and warping, which is more obvious for thick-walled or rigid containers; it may also cause deviations in the perpendicularity and coaxiality of the horizontal edge with the main body, which can easily lead to product scrap in fields with high appearance requirements.

[0005] Finally, it is also detrimental to the stability of the container's main structure. The large instantaneous radial and axial forces during direct bending can easily cause deformation of the container body. Thin-walled, large-diameter containers are prone to problems such as barrel dents and out-of-tolerance ellipticity, affecting dimensional accuracy, volume accuracy, and subsequent sealing and stacking requirements. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide an inner folding device for metal containers. This inner folding device can reduce stress concentration and deformation at the bending point during folding, improve structural stability and appearance flatness, adapt to multiple material specifications, and improve product quality and pass rate.

[0007] To solve the above technical problems, the following technical solution is adopted: An inner folding device for a metal container includes a frame, a cylindrical mold, and a rotary drive mechanism capable of driving the cylindrical mold to rotate around an axis. The rotary drive mechanism is mounted on the frame. The device further includes a first movable seat, a first moving drive mechanism capable of driving the first movable seat, a second movable seat, a second moving drive mechanism capable of driving the second movable seat, a limiting roller, a progressive folding wheel, and a shaping folding wheel. The first moving drive mechanism is mounted on the frame, the limiting roller is rotatably mounted on the first movable seat, and the limiting roller is parallel to the axis of the cylindrical mold. The second moving drive mechanism is mounted on either the frame or the first movable seat, and the progressive folding wheel and the shaping folding wheel are rotatably mounted on the second movable seat.

[0008] When using the aforementioned inner folding device to fold a metal container, the metal container is first placed into a cylindrical mold, ensuring close contact between the outer wall of the metal container and the cylindrical mold. The cylindrical mold limits the outer wall of the metal container, ensuring that the edge of the metal container to be folded protrudes from the upper edge of the cylindrical mold. After the rotary drive mechanism drives the cylindrical mold to rotate, causing the metal container to rotate, the first moving drive mechanism drives the first moving seat to move, ensuring that the surface of the limiting roller is in close contact with the metal container. This, together with the cylindrical mold, clamps the metal container, and the limiting roller rotates as the cylindrical mold rotates. Then, the second moving drive mechanism drives the second moving seat to move, bringing the progressive folding wheel closer to the exposed edge of the metal container, and performing multiple progressive folds from top to bottom (i.e., for example, the progressive folding wheel first moves inward from one-fifth of the edge to perform one fold; then moves back to the upper edge of the cylindrical mold). After reaching the outer edge of the container, the roller continues to descend by one-fifth and move inward for a second fold, and so on. During each fold, the first moving drive mechanism drives the first moving seat to move, ensuring that the limiting roller remains at the same height as the progressive folding roller and descends synchronously with the progressive folding roller. At the same time, the progressive folding roller maintains a movement distance slightly less than the folding distance each time it moves inward, so that after multiple folds, the upper edge of the metal container forms a stepped shape composed of vertical, horizontal, and vertical segments connected in sequence. Finally, the second moving drive mechanism drives the second moving seat to move, moving the progressive folding roller away from the metal container and bringing the shaping folding roller close to the exposed edge of the metal container. It then moves directly inward from the correct folding position on the upper edge of the metal container, completely flattening the steps during the inward movement, completing the final fold of the metal container, and changing the upper edge of the metal container from the vertical direction to the horizontal direction. This inner folding device avoids severe grain distortion at the bending point caused by sudden large bending forces through multiple progressive foldings from top to bottom and a single shaping folding. It effectively reduces stress concentration and deformation at the bending point, thereby improving the appearance flatness and structural stability, adapting to multiple material specifications, and improving product quality and pass rate.

[0009] In a preferred embodiment, the axes of the progressive folding wheel and the shaping folding wheel are perpendicular to each other.

[0010] In a further preferred embodiment, the axis of the progressive folding wheel is arranged vertically, and the axis of the shaping folding wheel is arranged horizontally, with the progressive folding wheel positioned above and to the side of the shaping folding wheel. Since both the progressive folding wheel and the shaping folding wheel rotate under the influence of the metal container when in contact with it, this arrangement allows for easier bending and flattening in a single operation. When performing multiple progressive folds on the metal container, the wheel surface of the progressive folding wheel contacts the upper edge of the metal container; when performing a shaping fold, the end face of the shaping folding wheel contacts the upper edge of the metal container.

[0011] In a further preferred embodiment, the junction between the side and end faces of the progressive bending wheel has rounded corners. By rounding the corners between the side and end faces of the progressive bending wheel, when the metal container is progressively bent multiple times, the stepped portion at the bending point can also form rounded corners, thereby effectively reducing the stress and deformation at the bending point during progressive bending and further improving the structural stability after final forming.

[0012] In a preferred embodiment, the junction between the side and end faces of the limiting roller has rounded corners. By rounding the corners between the side and end faces of the limiting roller, a rounded corner can be formed at the fold when the metal container is folded, thereby effectively reducing the stress and deformation at the bending point after the metal container is bent, and further improving the structural stability.

[0013] In a preferred embodiment, the second moving drive mechanism is disposed on the first moving base.

[0014] In a further preferred embodiment, the first moving drive mechanism includes a third moving seat, a first lifting drive device capable of driving the third moving seat to move up and down, and a first translation drive device capable of driving the first moving seat to move horizontally. The first lifting drive device is disposed on the frame, and the first translation drive device is disposed on the third moving seat. The second moving drive mechanism includes a fourth moving seat, a second translation drive device capable of driving the fourth moving seat to move horizontally, and a second lifting drive device capable of driving the second moving seat to move up and down. The second translation drive device is disposed on the first moving seat, and the second lifting drive device is disposed on the fourth moving seat.

[0015] The aforementioned first translation drive device, first lifting drive device, second translation drive device, and second lifting drive device can all employ a combination of a motor, reducer, gear, rack, at least one guide rail, and at least one guide block. The motor is mounted at a corresponding position (e.g., the motor in the first translation drive device is mounted on the first moving base; the motor in the first lifting drive device is mounted on the frame; the motor in the second translation drive device is mounted on the frame; the motor in the second lifting drive device is mounted on the second moving base). The gear is connected to the motor's power output shaft via the reducer, and the rack is mounted on the corresponding moving base and meshes with the gear. The number of guide rails and guide blocks is the same. Furthermore, each component is in a one-to-one correspondence. The guide rail is mounted on the frame or movable seat, and the guide block is mounted on the corresponding movable seat and can move along the guide rail (for example, the guide rail in the first translation drive device is mounted on the third movable seat, and the guide block in the first translation drive device is mounted on the first movable seat; the guide rail in the first lifting drive device is mounted on the third movable seat, and the guide block in the first lifting drive device is mounted on the third movable seat; the guide rail in the second translation drive device is mounted on the first movable seat, and the guide block in the second translation drive device is mounted on the fourth movable seat; the guide rail in the second lifting drive device is mounted on the fourth movable seat, and the guide block in the second lifting drive device is mounted on the second movable seat).

[0016] The aforementioned rotary drive mechanism can be implemented by combining a motor and a rotary table. The motor is mounted on the frame, the rotary table is mounted on the motor's power output shaft, and the cylindrical mold is mounted on the rotary table, with the axis of the cylindrical mold and the motor's power output shaft aligned in a straight line.

[0017] The beneficial effects of this utility model are as follows: this inner folding device can reduce stress concentration and deformation at the bending point during folding, improve structural stability and appearance flatness, adapt to multiple material specifications, and improve product quality and pass rate. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the inner folding device in an embodiment of the present utility model; Figure 2 This is a schematic diagram of the internal structure of the inner folding device in an embodiment of this utility model; Figure 3 This is a side view of the limiting roller or progressive folding wheel in an embodiment of the present utility model; Figure 4 This is a partial cross-sectional view of the metal container after its first progressive bending in an embodiment of this utility model; Figure 5 This is a partial cross-sectional view of the metal container after the second progressive bending in an embodiment of this utility model; Figure 6This is a partial cross-sectional view of the metal container after it has been shaped and folded in an embodiment of this utility model. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments: like Figure 1-3 The inner folding device for a metal container shown includes a frame 1, a cylindrical mold 2, a rotary drive mechanism 3 capable of driving the cylindrical mold 2 to rotate around an axis, a first movable seat 4, a first moving drive mechanism 5 capable of driving the first movable seat 4 to move, a second movable seat 6, a second moving drive mechanism 7 capable of driving the second movable seat 6 to move, a limiting roller 8, a progressive folding wheel 9, and a shaping folding wheel 10. The rotary drive mechanism 3 and the first moving drive mechanism 5 are respectively mounted on the frame 1. The limiting roller 8 is rotatably mounted on the first movable seat 4 and is parallel to the axis of the cylindrical mold 2. The second moving drive mechanism 7 is mounted on the first movable seat 4, and the progressive folding wheel 9 and the shaping folding wheel 10 are respectively rotatably mounted on the second movable seat 6.

[0020] When using the aforementioned inner folding device to fold the metal container 11, the metal container 11 is first placed into the cylindrical mold 2, so that the outer wall of the metal container 11 is in close contact with the cylindrical mold 2. The cylindrical mold 2 limits the outer wall of the metal container 11, and the edge of the metal container 11 to be folded protrudes from the upper edge of the cylindrical mold 2. After the rotary drive mechanism 3 drives the cylindrical mold 2 to rotate the metal container 11, the first moving drive mechanism 5 drives the first moving seat 4 to move, so that the wheel surface of the limiting roller 8 can be in close contact with the metal container 11, working together with the cylindrical mold 2 to clamp the metal container 11. As the cylindrical mold 2 drives the metal container 11 to rotate, the limiting roller 8 can also rotate accordingly. Then the second moving drive mechanism 7 drives the second moving seat 6 to move, so that... The progressive folding wheel 9 approaches the exposed edge of the metal container 11 and performs multiple progressive folds from top to bottom (i.e., the progressive folding wheel 9 first moves inward from one-fifth of the edge to perform one fold; then moves back to the outside of the metal container 11, continues to descend one-fifth and move inward to perform a second fold, and so on). During each fold, the first moving drive mechanism 5 drives the first moving seat 4 to move, so that the upper surface of the limiting roller 8 is always at the same height as the lower surface of the progressive folding wheel 9, and descends synchronously with the descent of the progressive folding wheel 9. At the same time, the progressive folding wheel 9 keeps the moving distance slightly less than the folding distance each time it moves inward, so that after multiple folds, the upper edge of the metal container 11 forms a stepped shape 12 composed of vertical segments, horizontal segments, and vertical segments connected in sequence (e.g., Figure 4-5(As shown); Finally, the second moving drive mechanism 7 drives the second moving seat 6 to move, causing the progressive folding wheel 9 to move away from the metal container 11, and bringing the shaping folding wheel 10 close to the exposed edge of the metal container 11, and moving directly inward from the correct folding position on the upper edge of the metal container 11. During the inward movement, the steps are completely flattened, completing the final folding of the metal container 11, so that the upper edge of the metal container 11 changes from the vertical direction to the horizontal direction (as shown). Figure 6 (As shown). This inner folding device avoids severe grain distortion at the bending point caused by sudden large bending forces through multiple progressive folds from top to bottom and a single shaping fold. It effectively reduces stress concentration and deformation at the bending point, thereby improving the appearance flatness and structural stability, adapting to multiple material specifications, and improving product quality and pass rate.

[0021] The progressive folding wheel 9 has its axis set vertically, while the shaping folding wheel 10 has its axis set horizontally, with the progressive folding wheel 9 positioned above and to the side of the shaping folding wheel 10. Since both the progressive folding wheel 9 and the shaping folding wheel 10 rotate under the influence of the metal container 11 when in contact with it, this arrangement allows for multiple progressive folds on the metal container 11, with the wheel surface of the progressive folding wheel 9 contacting the upper edge of the metal container 11; and during shaping folds, the end face of the shaping folding wheel 10 contacts the upper edge of the metal container 11, making it easier for the shaping folding wheel 10 to bend and flatten in one pass.

[0022] The junction between the side and end faces of the progressive bending wheel 9 has rounded corners. By rounding the corners between the side and end faces of the progressive bending wheel 9, when the metal container 11 is progressively bent multiple times, the stepped parts at the bending point can also form rounded corners, thereby effectively reducing the stress and deformation at the bending point during progressive bending and further improving the structural stability after final forming.

[0023] The junction between the side and end faces of the limiting roller 8 has rounded corners. By rounding the corners between the side and end faces of the limiting roller 8, when the metal container 11 is folded, a rounded corner can be formed at the fold, thereby effectively reducing the stress and deformation at the bending point after the metal container 11 is bent, and further improving the structural stability.

[0024] The first moving drive mechanism 5 includes a third moving seat 501, a first lifting drive device 502 capable of driving the third moving seat 501 to move up and down, and a first translation drive device 503 capable of driving the first moving seat 4 to move horizontally. The first lifting drive device 502 is mounted on the frame 1, and the first translation drive device 503 is mounted on the third moving seat 501. The second moving drive mechanism 7 includes a fourth moving seat 701, a second translation drive device 702 capable of driving the fourth moving seat 701 to move horizontally, and a second lifting drive device 703 capable of driving the second moving seat 6 to move up and down. The second translation drive device 702 is mounted on the first moving seat 4'', and the second lifting drive device 703 is mounted on the fourth moving seat 701.

[0025] The aforementioned first translation drive device 503, first lifting drive device 502, second translation drive device 702, and second lifting drive device 703 all employ a combination of a motor, reducer, gear, rack, two guide rails, and two guide blocks. The motors are installed at corresponding positions (the motor in the first translation drive device 503 is installed on the first moving seat 4; the motor in the first lifting drive device 502 is installed on the frame 1; the motor in the second translation drive device 702 is installed on the third moving seat 5014; and the motor in the second lifting drive device 703 is installed on the second moving seat 6). The gears are connected to the motor's power output shaft via the reducer, and the racks are installed on the corresponding moving seats and mesh with the gears. The number of guide rails and guide blocks is the same and they correspond one-to-one. The guide rail is installed on the frame 1 or the movable seat, and the guide block is installed on the corresponding movable seat and can move along the guide rail (the guide rail in the first translation drive device 503 is installed on the third movable seat 501, and the guide block in the first translation drive device 503 is installed on the first movable seat 4; the guide rail in the first lifting drive device 502 is installed on the frame 1, and the guide block in the first lifting drive device 502 is installed on the third movable seat 501; the guide rail in the second translation drive device 702 is installed on the first movable seat 4, and the guide block in the second translation drive device 702 is installed on the fourth movable seat 701; the guide rail in the second lifting drive device 703 is installed on the fourth movable seat 701, and the guide block in the second lifting drive device 703 is installed on the second movable seat 6).

[0026] The aforementioned rotary drive mechanism 3 employs a combination of a motor and a rotary table. The motor is mounted on the frame 1, the rotary table is mounted on the motor's power output shaft, and the cylindrical mold 2 is mounted on the rotary table. Furthermore, the axis of the cylindrical mold 2 is aligned with the motor's power output shaft.

Claims

1. An inner folding device for a metal container, comprising a frame, a cylindrical mold, and a rotary drive mechanism capable of driving the cylindrical mold to rotate about an axis, the rotary drive mechanism being mounted on the frame, characterized in that: It also includes a first movable seat, a first moving drive mechanism capable of driving the first movable seat to move, a second movable seat, a second moving drive mechanism capable of driving the second movable seat to move, a limiting roller, a progressive folding wheel, and a shaping folding wheel. The first moving drive mechanism is mounted on the frame, the limiting roller is rotatably mounted on the first movable seat, and the limiting roller is parallel to the axis of the cylindrical mold. The second moving drive mechanism is mounted on the frame or the first movable seat, and the progressive folding wheel and the shaping folding wheel are rotatably mounted on the second movable seat, respectively.

2. The inner folding device for a metal container as described in claim 1, characterized in that: The axes of the progressive folding wheel and the shaping folding wheel are perpendicular to each other.

3. The inner folding device for a metal container as described in claim 2, characterized in that: The axis of the progressive folding wheel is set vertically, the axis of the shaping folding wheel is set horizontally, and the progressive folding wheel is located above the side of the shaping folding wheel.

4. The inner folding device for a metal container as described in claim 3, characterized in that: The junction between the side and end faces of the progressive folding wheel has rounded corners.

5. The inner folding device for a metal container as described in claim 1, characterized in that: The junction between the side and end face of the limiting roller has rounded corners.

6. The inner folding device for a metal container as described in claim 1, characterized in that: The second moving drive mechanism is mounted on the first moving base.

7. The inner folding device for a metal container as described in claim 6, characterized in that: The first moving drive mechanism includes a third moving seat, a first lifting drive device capable of driving the third moving seat to move up and down, and a first translation drive device capable of driving the first moving seat to move horizontally. The first lifting drive device is mounted on the frame, and the first translation drive device is mounted on the third moving seat. The second moving drive mechanism includes a fourth moving seat, a second translation drive device capable of driving the fourth moving seat to move horizontally, and a second lifting drive device capable of driving the second moving seat to move up and down. The second translation drive device is mounted on the first moving seat, and the second lifting drive device is mounted on the fourth moving seat.

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