A metal can end inverting device

Abstract

A metal can bottom crimping inverting device, including a fixed seat, the fixed seat is rotatably installed with a guide sleeve, the upper part of the guide sleeve is slidably installed with a positioning claw, a plurality of positioning claws are symmetrically distributed, the positioning claws are integrally formed after being installed with elastic retaining rings between the positioning claws, a crimping wheel is arranged on the right side of the positioning claw, a tapered hole is formed by surrounding the middle part of the positioning claw, and a pressing block is slidably installed, a guide rod is rotatably installed at the center of the pressing block, the lower part of the guide rod is connected with a cylindrical cam through a roller after penetrating through the guide sleeve, an annular groove is processed on the outer surface of the cylindrical cam, the height of the annular groove changes regularly along the circumferential direction of the cylindrical cam, the roller is in rolling cooperation with the annular groove, and the cylindrical cam is connected with a power shaft; in the device, the guide rod is driven to move downward by the cylindrical cam, the pressing block extrudes the positioning claw to move radially and open, and then supports the bottom of the metal can, and then cooperates with the crimping wheel to invert the outwardly crimped lower edge; the positioning structure is stable, convenient to operate, and has high practicality.

Description

Technical Field

[0001] This utility model relates to a device for inward turning of the bottom edge of a metal can. Background Technology

[0002] Metal cans are common containers, typically made of metals such as iron, aluminum, and stainless steel. They are used to store and transport various items, including food, liquids, and chemicals. They are generally characterized by their robust structure, corrosion resistance, and airtight seal, protecting the contents from environmental factors. Metal cans can also be sealed by tipping or compression to ensure the safety and preservation of their contents. They are widely used in households, industry, and medical settings. The bottom and top openings of metal cans are typically finished with rolled edges to prevent scratches. However, existing rolled edge structures are often outward-facing, meaning the outer diameter of the rolled edge is larger than the outer diameter of the can itself. This makes stacking two cans difficult, causing challenges in transportation and storage. Utility Model Content

[0003] To address the shortcomings mentioned above, this utility model provides a device for inward turning of the bottom edge of a metal can.

[0004] To achieve the above objectives, this utility model provides a metal can bottom edge rolling and inward turning device, including a fixed base, a guide sleeve rotatably mounted on the fixed base, a positioning claw radially slidably mounted on the upper part of the guide sleeve, multiple positioning claws being centrally symmetrically distributed, a groove being machined circumferentially on the outer surface of the positioning claw and an elastic retaining ring being installed to form an integral structure, a rolling wheel being provided on the right side of the positioning claw, a conical hole being formed in the middle of the positioning claw, a pressure block being slidably mounted in the conical hole, a guide rod being rotatably mounted at the center of the pressure block, the lower part of the guide rod passing through the guide sleeve, a roller being mounted on the lower end of the guide rod through a positioning bracket, a cylindrical cam being provided below the guide rod, an annular groove being machined circumferentially on the outer surface of the cylindrical cam, the height of the annular groove varying regularly along the circumference of the cylindrical cam, the roller extending into the annular groove to form a rolling fit, a power shaft being connected to the middle of the cylindrical cam, and the rotation of the cylindrical cam driving the guide rod to perform lifting and lowering movements.

[0005] As a further improvement of this utility model, the lower part of the positioning claw is machined with a sliding groove, and the upper part of the guide sleeve is correspondingly provided with a slider to form a sliding fit with the sliding groove.

[0006] As a further improvement of this utility model, at least two sets of elastic retaining rings are provided along the height direction of the positioning claw.

[0007] As a further improvement of this utility model, the pressure block is rotatably mounted on the upper end of the guide rod via a first bearing assembly, and the outer wall of the pressure block is machined into a conical surface to cooperate with the conical hole.

[0008] As a further improvement of this utility model, a second bearing assembly is provided between the guide sleeve and the fixed seat.

[0009] As a further improvement of this utility model, an annular pressure cover is installed on the upper part of the guide sleeve and the outer side of the positioning claw, and the annular pressure cover limits the radial displacement of the positioning claw.

[0010] As a further improvement of this utility model, a curling mold is formed at the upper outer edge of the positioning claw to match the curling wheel.

[0011] As a further improvement of this utility model, the roller is perpendicular to the central axis of the guide rod, and the central axis of the cylindrical cam is parallel to the central axis of the guide rod.

[0012] As a further improvement of this utility model, the edge-rolling wheel is rotatably mounted on the side of the U-shaped frame facing the positioning claw, the edge-rolling wheel is driven to rotate by a motor, and the other side of the U-shaped frame is connected to a power arm.

[0013] The beneficial effects of this utility model are as follows:

[0014] The device uses a cylindrical cam to drive a guide rod to move up and down. As the guide rod descends, it drives the pressure block to move down synchronously. The pressure block squeezes the positioning claws to open radially and supports the bottom of the metal can. Then, with the help of the edge rolling wheel, the outward-turned lower edge is turned inward. The overall positioning structure is stable, easy to operate, and highly practical, making it convenient to stack and store metal cans. Attached Figure Description

[0015] Figure 1 This is a structural diagram of a metal can bottom edge rolling and inward turning device according to the present invention;

[0016] Figure 2 This is a schematic diagram of the working process of a metal can bottom edge rolling and inward turning device according to the present invention;

[0017] Figure 3 This is a cross-sectional view of the metal can 18 before the lower rolled edge 181 is turned inward;

[0018] Figure 4 This is a cross-sectional view of the lower rolled edge 181 of the metal can 18 after it has been turned inward.

[0019] In the diagram: 1. Positioning claw; 11. Groove; 12. Elastic retaining ring; 13. Slide groove; 14. Conical hole; 15. Hemming die; 2. Pressure block; 21. First bearing assembly; 22. Conical surface; 3. Guide rod; 4. Annular cover; 5. Guide sleeve; 51. Slider; 6. Fixed seat; 61. Second bearing assembly; 7. Positioning bracket; 8. Roller; 9. Cylindrical cam; 91. Annular groove; 10. Power shaft; 16. Hemming wheel; 161. U-shaped frame; 162. Power arm; 17. Motor; 18. Metal can; 181. Lower hemming. Detailed Implementation

[0020] like Figure 1 As shown, the metal can bottom rim-rolling and inward-turning device of this utility model includes a fixed base 6, a guide sleeve 5 rotatably mounted on the fixed base 6, a second bearing assembly 61 between the guide sleeve 5 and the fixed base 6, a positioning claw 1 radially slidably mounted on the upper part of the guide sleeve 5, a groove 13 machined on the lower part of the positioning claw 1, a corresponding slider 51 on the upper part of the guide sleeve 5 forming a sliding fit with the groove 13, multiple positioning claws 1 are centrally symmetrically distributed, a groove 11 is machined along the circumferential direction on the outer surface of the positioning claw 1 and an elastic retaining ring 12 is installed to form an integral structure, at least two sets of elastic retaining rings 12 are provided along the height direction of the positioning claw 1, an annular pressure cap 4 is installed on the upper part of the guide sleeve 5 and the outer side of the positioning claw 1, the annular pressure cap 4 limits the radial displacement of the positioning claw 1, a rim-rolling wheel 16 is provided on the right side of the positioning claw 1, a rim-rolling mold 15 is machined at the upper outer edge of the positioning claw 1 to match the rim-rolling wheel 16, the rim-rolling wheel 16 is rotatably mounted on a U-shaped frame 161 facing the positioning claw 1. On one side, the edge-rolling wheel 16 is driven to rotate by the motor 17. The other side of the U-shaped frame 161 is connected to the power arm 162. The positioning claw 1 forms a conical hole 14 in the middle. The pressure block 2 is slidably installed in the conical hole 14. The outer wall of the pressure block 2 is machined into a conical surface 22 to cooperate with the conical hole 14. The guide rod 3 is rotatably installed at the center of the pressure block 2. The pressure block 2 is rotatably installed on the upper end of the guide rod 3 through the first bearing assembly 21. The lower part of the guide rod 3 is fitted through the guide sleeve 5. The roller 8 is installed on the lower end of the guide rod 3 through the positioning bracket 7. A cylindrical cam 9 is provided below the guide rod 3. The outer surface of the cylindrical cam 9 is circumferentially machined with an annular groove 91. The height of the annular groove 91 changes regularly along the circumference of the cylindrical cam 9. The roller 8 extends into the annular groove 91 to form a rolling fit. The roller 8 is perpendicular to the central axis of the guide rod 3. The central axis of the cylindrical cam 9 is parallel to the central axis of the guide rod 3. The middle part of the cylindrical cam 9 is connected to the power shaft 10. After the cylindrical cam 9 rotates, it drives the guide rod 3 to move up and down.

[0021] The device uses a cylindrical cam to drive a guide rod to move up and down. As the guide rod descends, it drives the pressure block to move down synchronously. The pressure block squeezes the positioning claws to open radially and supports the bottom of the metal can. Then, with the help of the edge rolling wheel, the outward-turned lower edge is turned inward. The overall positioning structure is stable, easy to operate, and highly practical, making it convenient to stack and store metal cans.

[0022] In practical use, for ease of understanding of this utility model, it will be described in conjunction with the accompanying drawings;

[0023] like Figure 3 As shown, the lower rolled edge 181 at the bottom of the metal can 18 has an outward folded structure after forming. This is not conducive to the stacking of metal cans 18. The solution in this embodiment is mainly the same as folding the lower rolled edge 181 inward, thereby reducing the outer diameter of the lower rolled edge 181 (see Figure 4 This allows the metal cans 18 to be stacked along their height.

[0024] During operation, the metal can is placed on top of the positioning claw. The annular groove on the outer surface of the cylindrical cam has a low and a high position. The roller is initially positioned at the high position of the annular groove, and the guide rod is in an upward state. The initial outer diameter of the positioning claw is smaller than the inner diameter of the lower rolled edge. The power shaft rotates and drives the cylindrical cam to rotate synchronously. The roller rolls from the high position to the low position of the annular groove, and the overall position of the roller decreases. The height of the guide rod moves down synchronously with the roller along the guide sleeve. The conical surface on the outer side of the pressure block forms a squeezing force on the positioning claw. After being subjected to force, the positioning claw overcomes the elastic force of the elastic retaining ring and moves radially along the slider. The outer diameter of the positioning claw gradually increases. When the roller rolls to the lowest position of the annular groove, the positioning claw is opened to its maximum position by the pressure block and engages with the inner wall surface of the lower rolled edge. At this point, the metal can is positioned. The power arm moves the U-shaped frame and the edge-rolling wheel closer to the lower edge. The motor drives the edge-rolling wheel to rotate. The edge-rolling wheel, in conjunction with the edge-rolling die at the upper edge of the positioning claw, folds the lower edge inward. During this process, the roller is always located in the lower section of the annular groove, and the edge-rolling wheel abuts against the outer side of the lower edge. The friction between the edge-rolling wheel and the lower edge drives the metal can to rotate, thus completing the inward folding of the entire lower edge. Then, the power arm drives the edge-rolling wheel to reset, and the roller rolls from the lower section of the annular groove to the upper section again. The guide rod drives the pressure block to gradually rise. After the positioning claw loses the squeezing force of the pressure block, it contracts radially through the elastic memory of the elastic retaining ring. The positioning claw disengages from the inner wall of the lower edge, and the metal can can be directly removed.

[0025] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A device for inwardly turning the bottom edge of a metal can, characterized in that: Includes a fixed base (6), on which a guide sleeve (5) is rotatably mounted. A positioning claw (1) is radially slidably mounted on the upper part of the guide sleeve (5). Multiple positioning claws (1) are centrally symmetrically distributed. A groove (11) is machined circumferentially on the outer surface of the positioning claw (1) and an elastic retaining ring (12) is installed to form an integral structure. A curling wheel (16) is provided on the right side of the positioning claw (1). A conical hole (14) is formed in the middle of the positioning claw (1). A pressure block (2) is slidably mounted in the conical hole (14). A guide rod (3) is rotatably mounted at the center of the pressure block (2). The guide rod (3) passes through the guide sleeve (5) at its lower part. The roller (8) is installed at the lower end of the guide rod (3) through the positioning bracket (7). A cylindrical cam (9) is provided below the guide rod (3). An annular groove (91) is machined on the outer surface of the cylindrical cam (9). The height of the annular groove (91) changes regularly along the circumferential direction of the cylindrical cam (9). The roller (8) extends into the annular groove (91) to form a rolling fit. The middle part of the cylindrical cam (9) is connected to the power shaft (10). After the cylindrical cam (9) rotates, it drives the guide rod (3) to make lifting and lowering movements.

2. The metal can bottom edge rolling and inward turning device according to claim 1, characterized in that: The lower part of the positioning claw (1) is machined with a sliding groove (13), and the upper part of the guide sleeve (5) is provided with a corresponding slider (51) to form a sliding fit with the sliding groove (13).

3. The metal can bottom edge rolling and inward turning device according to claim 1, characterized in that: The elastic retaining ring (12) is provided in at least two sets along the height direction of the positioning claw (1).

4. The metal can bottom edge rolling and inward turning device according to claim 1, characterized in that: The pressure block (2) is rotatably mounted on the upper end of the guide rod (3) via the first bearing assembly (21), and the outer wall of the pressure block (2) is machined into a conical surface (22) to cooperate with the conical hole (14).

5. The metal can bottom edge rolling and inward turning device according to claim 1, characterized in that: A second bearing assembly (61) is provided between the guide sleeve (5) and the fixed seat (6).

6. The metal can bottom edge rolling and inward turning device according to claim 1, characterized in that: An annular pressure cap (4) is installed on the upper part of the guide sleeve (5) and the outer side of the positioning claw (1). The annular pressure cap (4) limits the radial displacement of the positioning claw (1).

7. The metal can bottom edge rolling and inward turning device according to claim 1, characterized in that: The upper outer edge of the positioning claw (1) is machined to form a curling mold (15) that matches the curling wheel (16).

8. The metal can bottom edge rolling and inward turning device according to claim 1, characterized in that: The roller (8) is perpendicular to the central axis of the guide rod (3), and the central axis of the cylindrical cam (9) is parallel to the central axis of the guide rod (3).

9. A metal can bottom edge rolling and inward turning device according to claim 1, characterized in that: The edge-rolling wheel (16) is rotatably mounted on the side of the U-shaped frame (161) facing the positioning claw (1). The edge-rolling wheel (16) is driven to rotate by a motor (17). The other side of the U-shaped frame (161) is connected to the power arm (162).

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