Metal can welding seam automatic position finding mechanism

Abstract

The utility model discloses a metal can welding seam automatic position finding mechanism which comprises a rack, a rotating shaft, a positioning rotating disc, a positioning partition plate, a controller, a plurality of position finding photoelectric eyes and a plurality of can body rotating positioning mechanisms capable of driving a metal can body to rotate, the positioning partition plate is installed on the rack, and a first through hole is formed in the center of the positioning partition plate. A plurality of second through holes are formed in the positioning partition plate, the positioning rotary disc is located above the positioning partition plate, and a plurality of arc-shaped notches are formed in the outer edge of the positioning rotary disc at equal intervals in the circumferential direction of the positioning rotary disc; the tank body rotary positioning mechanisms are installed on the positioning partition plate and located in the corresponding second through holes respectively, the position finding photoelectric eyes are installed on the rack and located above the positioning partition plate, and the position finding photoelectric eyes are located on the outer sides of the corresponding second through holes respectively; the signal output end of each position finding photoelectric eye is electrically connected with the corresponding signal input end of the controller, and the tank body rotating and positioning mechanism is electrically connected with the corresponding signal output end of the controller.

Description

Technical Field

[0001] The utility model relates to the technical field of metal can making equipment, in particular to an automatic weld positioning mechanism for a metal can. Background Art

[0002] The metal body of existing metal cans is typically formed by bending a single piece of canning iron sheet into a cylindrical shape, then resistance welding the ends together to create a cylindrical metal can body. A thread expansion process then creates a number of external threads on the outer edge of the can opening, allowing the can opening to mate with the metal lid threads and enhance the seal between the two. However, some current can openings have external threads located along the weld seam. Because the weld seam is thicker than the can body sheet, the thread expansion process can easily damage the coating at the weld seam, affecting the can's aesthetic appearance and potentially causing rust in this area, shortening the product's service life. Furthermore, the excessive force used to expand the threads can easily cause the weld seam at the can opening to crack.

[0003] Most existing metal can manufacturing equipment lacks effective weld seam positioning and avoidance mechanisms, making it impossible to automatically match and adjust the thread expansion station to the weld seam position. This inevitably results in the external thread being machined onto the weld seam, leading to the aforementioned problems. Therefore, designing a metal can weld seam automatic positioning mechanism that can automatically detect and locate the weld seam has become a pressing technical issue. Utility Model Content

[0004] The problem to be solved by the utility model is to provide a metal can weld automatic positioning mechanism, which can automatically detect, find and locate the weld position, ensure that the expansion process will not be carried out at the weld, and effectively protect the coating at the weld.

[0005] In order to solve the above technical problems, the technical solutions adopted by the present invention are as follows:

[0006] A metal can weld automatic positioning mechanism, comprising a frame, a rotating shaft, a positioning turntable and a turntable driving mechanism capable of driving the rotating shaft to rotate intermittently; the turntable driving mechanism is mounted on the frame, the rotating shaft is rotatably mounted on the frame, and the positioning turntable is mounted on the rotating shaft; the characteristic is that it also comprises a positioning partition, a controller, a plurality of positioning photoelectric eyes and a plurality of can body rotation positioning mechanisms capable of driving the metal can body to rotate, the positioning partition is mounted on the frame, a first through hole is provided in the center of the positioning partition, a plurality of second through holes are provided on the positioning partition along its circumference at equal intervals, the rotating shaft is in the first through hole, the positioning turntable is above the positioning partition, and the outer edge of the positioning turntable is along the upper edge It has multiple arc-shaped notches at equal intervals around the circumference, and the number of arc-shaped notches, positioning photoelectric eyes, and tank body rotation positioning mechanisms are the same as the second through holes and correspond one to one; each tank body rotation positioning mechanism is installed on the positioning partition and is respectively located in the corresponding second through holes, each positioning photoelectric eye is installed on the frame and is respectively located above the positioning partition, and each positioning photoelectric eye is respectively located on the outside of the corresponding second through holes, and the detection direction of each positioning photoelectric eye is respectively toward the surface of the metal can body on the corresponding tank body rotation positioning mechanism; the signal output end of each positioning photoelectric eye is respectively electrically connected to the corresponding signal input end of the controller, and the tank body rotation positioning mechanism is electrically connected to the corresponding signal output end of the controller.

[0007] Typically, the controller is a PLC or an industrial computer.

[0008] During operation, the metal cans are first transported one by one in a standing state to the tank body rotation positioning mechanism of the positioning partition. The tank body rotation positioning mechanism fixes the bottom of the metal can, and at the same time, part of the metal can body is in the arc-shaped notch on the outer edge of the positioning turntable, completing the positioning of the metal can to ensure that it will not be accidentally displaced during subsequent movement. Then, the detection direction of each positioning photoelectric eye is aligned with the surface of the metal can body on the corresponding tank body rotation positioning mechanism. While the metal can body is rotated by the tank body rotation positioning mechanism, the positioning photoelectric eye continuously emits a detection beam to the rotating tank body surface and receives the reflected signal; when the positioning photoelectric eye detects a weld, it immediately sends a signal to the controller, which records the rotation angle of the metal can at this time and controls the tank body rotation positioning mechanism to stop driving the metal can to rotate. In this way, the weld is positioned and fixed at the predetermined position, avoiding the subsequent expansion processing position.

[0009] After the weld is positioned, the can proceeds to the next thread expansion station as the positioning turntable rotates. Since the weld is already positioned, thread expansion will not affect the weld. Each time the positioning turntable rotates through a station, a new can is placed on the can body's rotational positioning mechanism. Simultaneously, the can body, with the weld positioned, rotates along the positioning turntable to the next thread expansion station. Multiple, evenly spaced second through-holes ensure that the can body passes through each weld positioning station on the positioning turntable at a constant interval, achieving a uniform weld positioning rhythm.

[0010] In a preferred embodiment, a curved tank retaining block is disposed in the curved notch, and the outer side of the curved tank retaining block has a curved concave surface that matches the outer surface of the metal tank. The curved concave surface of the curved tank retaining block matches the outer shape of the tank, enabling contact and support over a larger area. Compared to point or line contact methods, it can more stably secure the tank and prevent shaking during high-speed rotation.

[0011] In a preferred embodiment, the positioning turntable includes an adjustment ring and multiple sector-shaped segments. The adjustment ring is mounted on the rotating shaft, and the inner edges of each sector are mounted on the adjustment ring. The sectors are sequentially spliced along the circumference of the adjustment ring to form a ring. If a sector is damaged, only that specific sector needs to be replaced, without replacing the entire positioning turntable. This facilitates disassembly and replacement, reducing maintenance difficulty and costs.

[0012] In a preferred embodiment, the can body rotation positioning mechanism includes a rotating disk and a rotation drive mechanism capable of driving the rotating disk. The rotation drive mechanism is mounted on the bottom of the positioning baffle, with the power output end of the rotation drive mechanism located below the second through-hole. The rotating disk is mounted on the power output end of the rotation drive mechanism and is located in and capable of rotating within the corresponding second through-hole. Driven by the rotation drive mechanism, the rotating disk can rotate smoothly. The rotating disk is magnetic and can be attracted and fixed to the bottom of the metal can by magnetic force, eliminating the need for complex clamps or fasteners, simplifying loading and unloading operations and improving work efficiency.

[0013] In a further preferred embodiment, the rotary drive mechanism includes a motor flange seat and a servo motor. The servo motor is mounted on the bottom of the positioning partition through the motor flange seat, and the power output shaft of the servo motor is located below the second through hole.

[0014] In a preferred embodiment, the turntable drive mechanism includes a drive motor, a reducer, a driving gear, and a driven gear. The drive motor and reducer are both mounted on the frame. The drive motor's power output shaft is coupled to the reducer's power input shaft. The driving gear is mounted on the reducer's power output shaft. The driven gear is mounted on the rotating shaft, and the driven gear meshes with the driving gear. During operation, the drive motor drives the driving gear through the reducer, thereby rotating the driven gear, the rotating shaft, the positioning turntable, and the arc-shaped notch therein.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] The utility model can automatically detect, find and locate the weld position, ensuring that the expansion process will not be performed at the weld, effectively protecting the coating at the weld, avoiding appearance defects and rust risks caused by coating damage, and eliminating the risk of weld cracking during the expansion process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural diagram of a specific embodiment of the utility model;

[0018] Figure 2 yes Figure 1 Schematic cross-section diagram (turntable drive mechanism omitted);

[0019] Figure 3 It is a structural schematic diagram of a metal can in a specific embodiment of the present utility model. DETAILED DESCRIPTION

[0020] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] like Figure 1-3 As shown, the automatic positioning mechanism for the weld of a metal can in this embodiment includes a frame (not shown in the figure), a rotating shaft 1, a positioning turntable 2, a turntable driving mechanism 3 capable of driving the rotating shaft 1 to rotate intermittently, a positioning partition 4, a controller (not shown in the figure), a plurality of positioning photoelectric eyes 5 and a plurality of tank body rotation positioning mechanisms 6 capable of driving the metal can body to rotate, the turntable driving mechanism 3 is mounted on the frame, the rotating shaft 1 is rotatably mounted on the frame, and the positioning turntable 2 is mounted on the rotating shaft 1; the positioning partition 4 is mounted on the frame, and a first through hole 41 is provided at the center of the positioning partition 4, and a plurality of second through holes 42 are provided on the positioning partition 4 at equal intervals along its circumference, the rotating shaft 1 is in the first through hole 41, the positioning turntable 2 is above the positioning partition 4, and the positioning turntable 2 is mounted on the rotating shaft 1. A plurality of arc-shaped notches 21 are provided at equal intervals along the circumference of the outer edge of the disk 2. The number of the arc-shaped notches 21, the positioning photoelectric eyes 5, the tank body rotation positioning mechanisms 6 and the second through holes 42 are the same and correspond one to one; each tank body rotation positioning mechanism 6 is mounted on the positioning partition 4 and is respectively located in the corresponding second through hole 42, each positioning photoelectric eye 5 is mounted on the frame and is respectively located above the positioning partition 4, and each positioning photoelectric eye 5 is respectively located on the outside of the corresponding second through hole 42, and the detection direction of each positioning photoelectric eye 5 is respectively toward the surface of the metal can body on the corresponding tank body rotation positioning mechanism 6; the signal output end of each positioning photoelectric eye 5 is respectively electrically connected to the corresponding signal input end of the controller, and the tank body rotation positioning mechanism 6 is electrically connected to the corresponding signal output end of the controller.

[0022] Typically, the controller is a PLC or an industrial computer.

[0023] During operation, the metal cans 7 are first transported one by one in a standing state to the tank body rotation positioning mechanism 6 of the positioning partition 4. The tank body rotation positioning mechanism 6 fixes the bottom of the metal can 7. At the same time, part of the metal can 7 is located in the arc-shaped notch 21 on the outer edge of the positioning turntable 2, completing the positioning of the metal can 7 to ensure that it will not be accidentally displaced during subsequent movement. Then, the detection direction of each positioning photoelectric eye 5 is aligned with the surface of the metal can 7 on the corresponding tank body rotation positioning mechanism 6. While the metal can 7 is rotated by the tank body rotation positioning mechanism 6, the positioning photoelectric eye 5 continuously emits a detection beam to the rotating tank surface and receives the reflected signal; when the positioning photoelectric eye 5 detects the weld 71, it immediately sends a signal to the controller, which records the rotation angle of the metal can 7 at this time and controls the tank body rotation positioning mechanism 6 to stop driving the metal can 7 to rotate. In this way, the weld 71 is positioned and fixed at the predetermined position, avoiding the subsequent expansion processing position.

[0024] After the weld 71 is positioned, the metal can 7 moves to the next thread expansion processing station as the positioning turntable 2 rotates. Since the weld 71 is already positioned at the predetermined position, the thread expansion process will not affect the weld 71. Each time the positioning turntable 2 rotates one station, a new metal can 7 is placed on the can body rotation positioning mechanism 6. Simultaneously, the can body with the weld 71 positioned rotates with the positioning turntable 2 to the next thread expansion processing station. The multiple, equally spaced second through-holes 42 enable the can body to sequentially pass through each weld 71 positioning station on the positioning turntable 2 at a constant time interval, achieving a uniform weld 71 positioning rhythm.

[0025] A curved tank retaining block 22 is positioned within the curved notch 21. The outer side of the curved tank retaining block 22 is provided with a curved concave surface 221 that matches the shape of the metal tank body. The curved concave surface 221 of the curved tank retaining block 22 matches the outer shape of the tank body, enabling contact and support over a larger area. Compared to point or line contact methods, this provides a more stable fixation of the tank body and prevents shaking during high-speed rotation.

[0026] The positioning turntable 2 comprises an adjustment ring 201 and a plurality of sectors 202. The adjustment ring 201 is mounted on the rotating shaft 1. The inner edges of the sectors 202 are mounted on the adjustment ring 201. The sectors 202 are sequentially connected along the circumference of the adjustment ring 201 to form a ring. If a sector 202 is damaged, only that sector 202 needs to be replaced, without replacing the entire positioning turntable 2. This facilitates disassembly and replacement, reducing maintenance difficulty and cost.

[0027] The can body rotation positioning mechanism 6 includes a rotating disk 61 and a rotating drive mechanism 62 capable of driving the rotating disk 61 to rotate. The rotating drive mechanism 62 is mounted on the bottom of the positioning partition 4, and the power output end of the rotating drive mechanism 62 is located below the second through hole 42. The rotating disk 61 is mounted on the power output end of the rotating drive mechanism 62. The rotating disk 61 is located in the corresponding second through hole 42 and can rotate in the corresponding second through hole 42. The rotating disk 61 can rotate smoothly under the drive of the rotating drive mechanism 62. The rotating disk 61 is magnetic and can absorb and fix the bottom of the metal can through magnetic force, without the need for complex clamps or fasteners, simplifying loading and unloading operations and improving work efficiency.

[0028] The rotation drive mechanism 62 includes a motor flange seat 621 and a servo motor 622 . The servo motor 622 is mounted on the bottom of the positioning partition 4 through the motor flange seat 621 . The power output shaft of the servo motor 622 is located below the second through hole 42 .

[0029] The turntable drive mechanism 3 includes a drive motor 31, a reducer 34, a driving gear 32, and a driven gear 33. The drive motor 31 and the reducer 34 are both mounted on the frame. The power output shaft of the drive motor 31 is connected to the power input shaft of the reducer 34. The driving gear 32 is mounted on the power output shaft of the reducer 34. The driven gear 33 is mounted on the rotating shaft 1, and the driven gear 33 meshes with the driving gear 32. During operation, the drive motor 31 drives the driving gear 32 to rotate through the reducer 34, thereby driving the driven gear 33, the rotating shaft 1, the positioning turntable 2, and the arc-shaped notch 21 thereon to rotate together.

[0030] In addition, it should be noted that the names of the various parts of the specific embodiments described in this specification may be different. Any equivalent or simple changes made based on the structure, features, and principles described in the concept of this utility model patent are included in the scope of protection of this utility model patent. Those skilled in the art of the technical field to which this utility model belongs may make various modifications or supplements to the specific embodiments described, or replace them with similar methods. As long as they do not deviate from the structure of this utility model or exceed the scope defined by this claim, they shall fall within the scope of protection of this utility model.

Claims

1. A metal can weld seam automatic positioning mechanism, comprising a frame, a rotating shaft, a positioning turntable, and a turntable drive mechanism capable of driving the rotating shaft to intermittently rotate; the turntable drive mechanism is mounted on the frame, the rotating shaft is rotatably mounted on the frame, and the positioning turntable is mounted on the rotating shaft; the mechanism is characterized by: It also includes a positioning partition, a controller, multiple positioning photoelectric eyes and multiple tank body rotation positioning mechanisms that can drive the metal can body to rotate. The positioning partition is installed on the frame, and a first through hole is provided in the center of the positioning partition. A plurality of second through holes are provided on the positioning partition at equal intervals along its circumference. The rotating shaft is in the first through hole, and the positioning turntable is above the positioning partition. A plurality of arc-shaped notches are provided on the outer edge of the positioning turntable at equal intervals along its circumference. The number of arc-shaped notches, positioning photoelectric eyes and tank body rotation positioning mechanisms is the same as that of the second through holes and corresponds one to one. Each tank body rotation positioning mechanism is installed on the positioning partition and is respectively in the corresponding second through hole. Each positioning photoelectric eye is installed on the frame and is respectively above the positioning partition, and each positioning photoelectric eye is respectively on the outside of the corresponding second through hole. The detection direction of each positioning photoelectric eye is toward the surface of the metal can body on the corresponding tank body rotation positioning mechanism. The signal output end of each positioning photoelectric eye is respectively electrically connected to the corresponding signal input end of the controller, and the tank body rotation positioning mechanism is electrically connected to the corresponding signal output end of the controller.

2. The automatic weld seam positioning mechanism for a metal can according to claim 1, characterized in that: An arc-shaped tank protection block is provided in the arc-shaped notch, and an outer side surface of the arc-shaped tank protection block is provided with an arc-shaped concave surface matching the metal tank body.

3. The automatic weld seam positioning mechanism for a metal can according to claim 1, characterized in that: The positioning turntable includes an adjustment ring and a plurality of sector blocks. The adjustment ring is mounted on the rotating shaft. The inner edges of the sector blocks are mounted on the adjustment ring, and the sector blocks are sequentially spliced into a ring along the circumference of the adjustment ring.

4. The automatic weld seam positioning mechanism for a metal can according to claim 1, characterized in that: The tank body rotation positioning mechanism includes a rotating disk and a rotating drive mechanism capable of driving the rotating disk to rotate. The rotating drive mechanism is installed at the bottom of the positioning partition, and the power output end of the rotating drive mechanism is below the second through hole. The rotating disk is installed on the power output end of the rotating drive mechanism. The rotating disk is in the corresponding second through hole and can rotate in the corresponding second through hole.

5. The automatic weld seam positioning mechanism for a metal can according to claim 4, characterized in that: The rotary drive mechanism includes a motor flange seat and a servo motor. The servo motor is installed on the bottom of the positioning partition through the motor flange seat, and the power output shaft of the servo motor is located below the second through hole.

6. The automatic weld seam positioning mechanism for a metal can according to claim 1, characterized in that: The turntable drive mechanism includes a drive motor, a reducer, a driving gear and a driven gear. The drive motor and the reducer are both installed on the frame. The power output shaft of the drive motor is connected to the power input shaft of the reducer. The driving gear is installed on the power output shaft of the reducer. The driven gear is installed on the rotating shaft, and the driven gear is engaged with the driving gear.

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