Automatic laser welding machine for intaglio plate making

Abstract

The application discloses a kind of automatic laser welding machine of intaglio plate making, it is related to laser welding machine field, it includes frame and with frame slidingly arranged laser welding gun, the support roller is fixedly arranged in the frame, the steel plate roll welded into cylinder by laser welding gun is movably arranged on the support roller, the auxiliary mechanism for welding seam of steel plate roll is stopped in the middle of support roller and is suitable for welding position is arranged on the frame, the moving end of the auxiliary mechanism is provided with the steering roller one and the steering roller two by the synchronous rotation of the same direction adjustment steel plate roll weld seam position.The same direction rotation of steering roller one and steering roller two is driven by auxiliary mechanism in the application, so that steel plate roll rotates, and the welding seam of steel plate roll is aligned above support roller and below laser welding gun, for accurate welding, avoid steel plate roll from inertia and cause welding seam position inaccuracy due to sliding.

Description

Technical Field

[0001] This application relates to the field of laser welding machines, and more particularly to an automatic laser welding machine for gravure printing plates. Background Technology

[0002] In gravure printing plate making, the base roller is the core carrier of the printed pattern. Its manufacturing process begins by rolling a steel plate of predetermined size into a cylindrical shape, then welding the longitudinal seams together to form a robust, seamless precision roller, which can then be used for subsequent processes such as electroplating and engraving. Laser welding, due to its advantages such as concentrated energy, small heat-affected zone, and good weld formation, has become the preferred process for high-quality base roller welding.

[0003] Existing welding equipment for this type of operation aligns the steel coil by inserting a central vertical plate into the seam to be welded. This operation requires the seam to be welded on the steel coil to be aligned with the central vertical plate. However, when the conveying mechanism places the steel coil on the support rollers, it will roll or slide due to inertia, and the final resting position is random. It cannot be guaranteed that the weld seam will stop exactly at the preset angle aligned with the central vertical plate. Utility Model Content

[0004] To improve the problem of inaccurate positioning of weld seams on steel plate coils, this application provides an automatic laser welding machine for gravure printing plates.

[0005] The automatic laser welding machine for gravure printing plates provided in this application adopts the following technical solution:

[0006] An automatic laser welding machine for gravure printing plates includes a frame and a laser welding gun slidably disposed with the frame. A support roller is fixedly disposed inside the frame, and a steel plate coil welded into a roller by the laser welding gun is movably disposed on the support roller. An auxiliary mechanism is provided on the frame for stopping the weld seam of the steel plate coil at a suitable welding position in the middle of the support roller. The moving end of the auxiliary mechanism is provided with a first guide roller and a second guide roller, which adjust the position of the weld seam of the steel plate coil by rotating synchronously in the same direction.

[0007] By adopting the above technical solution, the auxiliary mechanism drives the first and second steering rollers to rotate in the same direction, thereby rotating the steel plate coil. The weld seam of the steel plate coil is aligned with the upper part of the support roller and the lower part of the laser welding gun for accurate welding, avoiding the steel plate coil from slipping due to inertia and causing inaccurate weld seam position.

[0008] Preferably, the auxiliary mechanism includes a base plate slidably mounted on the frame, with side blocks fixedly mounted on both sides of the base plate. Symmetrically mounted on the frame are drive rods for adjusting the height of steering roller one and steering roller two, with the drive end of the drive rod connected to the side blocks. Symmetrically mounted within the base plate are support plates one and two, respectively rotatably mounted to steering roller one and steering roller two.

[0009] By adopting the above technical solution, the use of the drive rod allows the steering roller one and steering roller two to be raised and lowered as a whole, providing a mechanical basis for adapting to steel plate coils of different diameters and different placement heights.

[0010] Preferably, an end face gear is fixedly provided on one side of the first steering roller, a spur gear is meshed on one side of the first end face gear, and an end face gear connected to the second steering roller is meshed on the side of the spur gear away from the first end face gear. The spur gear realizes the rotation of the first steering roller and the second steering roller through a drive structure.

[0011] By adopting the above technical solution, regardless of how the horizontal distance between the two steering rollers is adjusted, their rotational speed and direction of rotation remain consistent because they are both meshed with the same spur gear.

[0012] Preferably, the drive structure includes a connecting plate disposed on the base plate, a servo motor disposed on the connecting plate, a rotating shaft passing through the connecting plate on one side of the spur gear, and the drive end of the servo motor being connected to the rotating shaft.

[0013] By adopting the above technical solution, the servo motor can receive pulse commands from the PLC and perform very precise position, speed and torque control.

[0014] Preferably, the dimensions and number of teeth of the first end face gear and the second end face gear are the same.

[0015] By adopting the above technical solution, the same gear means that under the drive of the spur gear, the rotational speed and circumferential speed of the two steering rollers are completely consistent, so that the friction transmission in contact with the cylinder is more stable and uniform, and will not cause scratches or drive failure on the cylinder surface due to speed difference.

[0016] Preferably, a connecting rod is provided on one side of both the first support plate and the second support plate, and a threaded rod for adjusting the distance between the first steering roller and the second steering roller is rotatably provided inside the connecting rod, and the threaded rod passes through the side block.

[0017] By adopting the above technical solution, the threaded rod can convert the rotational motion of the motor into precise linear displacement, thereby adjusting the spacing of the steering rollers to accommodate cylinders of various diameters. At the same time, the thread has a self-locking characteristic, ensuring the stability of the working state.

[0018] Preferably, a protective shell is fixedly provided on the base plate, and the first end face gear, the spur gear, and the second end face gear are all located inside the protective shell.

[0019] While employing the aforementioned technical solutions, metal dust, spatter, and oil contamination are unavoidable at the welding site. The protective shell effectively protects the precision gear meshing pairs, preventing foreign objects from entering and causing gear wear, jamming, or damage.

[0020] Preferably, the frame is provided with a fixing mechanism for maintaining the position of the weld seam of the steel plate roll.

[0021] By adopting the above technical solution, the fixing mechanism can firmly press the cylinder onto the support roller before welding, ensuring that the laser spot is always aligned with the weld.

[0022] In summary, this application includes at least one of the following beneficial technical effects:

[0023] 1. By positioning end face gear one and end face gear two on opposite sides of the spur gear and rotating the spur gear, the first and second steering rollers rotate in the same direction. The simultaneous rotation of the first and second steering rollers drives the cylindrical steel plate roll to rotate. Through the cooperation of sensors and servo motors, the weld seam is precisely positioned on the support roller at the most suitable top position for welding, avoiding the steel plate roll from slipping due to inertia and causing inaccurate weld seam position.

[0024] 2. The rotation of two threaded rods drives the adjustment of guide rollers one and two, thereby moving the two end-face gears one and two to different positions relative to the spur gear. Since the length of the spur gear is the same as the adjustment length of guide rollers one and two, the end-face gears one and two will not disengage from the spur gear. The adjustable guide rollers one and two allow a single machine to handle steel plate coils of different diameters and widths. Adjusting the threaded rods changes the distance and position between the rollers to accommodate new cylinder diameters. Attached Figure Description

[0025] Figure 1 This is a three-dimensional schematic diagram of the overall structure of this application;

[0026] Figure 2 This is a side view of the overall structure of this application;

[0027] Figure 3 This is a front view of the overall structure of this application;

[0028] Figure 4 This is a partial structural diagram of the auxiliary mechanism in this application;

[0029] Figure 5 This is a schematic diagram of the auxiliary mechanism structure of this application.

[0030] Reference numerals: 1. Frame; 2. Laser welding gun; 3. Support roller; 4. Steel plate coil;

[0031] 5. Auxiliary mechanism; 51. Base plate; 52. Side block; 53. Drive rod; 54. Support plate one; 55. Support plate two; 56. End face gear one; 57. Spur gear; 58. End face gear two; 59. Rotating shaft; 510. Connecting plate; 511. Servo motor; 512. Protective shell; 513. Connecting rod; 514. Threaded rod;

[0032] 6. Steering roller one; 7. Steering roller two; 8. Fixing mechanism. Detailed Implementation

[0033] The following is in conjunction with the appendix Figures 1-5 This application will be described in further detail.

[0034] This application discloses an automatic laser welding machine for gravure printing plates.

[0035] Reference Figure 1 , Figure 2 An automatic laser welding machine for gravure printing plates includes a frame 1 and a laser welding gun 2 slidably disposed with the frame 1. The inner side of the frame 1 is fixedly installed with one end of a support roller 3. A steel plate roll 4 can be sleeved on the outside of the support roller 3. The steel plate roll 4 is formed by bending and rolling the steel plate into a cylindrical shape to form a weld. The weld is welded into a cylinder by the laser welding gun 2. An auxiliary mechanism 5 is provided on the frame 1. The auxiliary mechanism 5 is used to stop the weld of the steel plate roll 4 in a suitable welding position in the middle of the support roller 3. A first guide roller 6 and a second guide roller 7 are provided on the moving end of the auxiliary mechanism 5. The first guide roller 6 and the second guide roller 7 adjust the position of the weld of the steel plate roll 4 by rotating synchronously in the same direction. Fixing mechanisms 8 are provided on both sides of the inside of the frame 1. The fixing mechanisms 8 are used to fix the steel plate roll 4 after the position of the steel plate roll 4 is adjusted to maintain the position of the weld of the steel plate roll 4.

[0036] The steel plate coil 4, rolled into a cylindrical shape, is placed onto the support roller 3 by a conveying mechanism or by a worker. The support roller 3, along with the first steering roller 6 and the second steering roller 7, simultaneously support the steel plate coil 4. The auxiliary mechanism 5 is activated to drive the first steering roller 6 and the second steering roller 7 to rotate. The first steering roller 6 and the second steering roller 7 rotate synchronously in the same direction, causing the steel plate coil 4 to rotate until the weld seam of the steel plate coil 4 is located above the middle of the support roller 3 and below the welding head of the laser welding gun 2. Then, the fixing mechanism 8 is activated to fix and clamp the steel plate coil 4 and fix the weld seam of the steel plate coil 4. Finally, the laser welding gun 2 is activated to weld the weld seam of the steel plate coil 4.

[0037] Reference Figure 3 , Figure 5 The auxiliary mechanism 5 includes a base plate 51 slidably mounted on the frame 1. The two sides of the base plate 51 are respectively fixed to a side block 52. The bottom inner side of the frame 1 is fixed to the mounting end of the drive rod 53. The drive rod 53 is used to adjust the height of the first steering roller 6 and the second steering roller 7. The driving end of the drive rod 53 is connected to the bottom surface of the side block 52. The interior of the base plate 51 is slidably connected to two symmetrically arranged support plates 54 and 55. The interior of the two support plates 54 is slidably connected to both ends of the first steering roller 6. The interior of the two support plates 55 is slidably connected to both ends of the second steering roller 7. The support plates 54 and 55 are used to support the first steering roller 6 and the second steering roller 7.

[0038] When the size of the steel plate coil 4 changes, the steel plate coil 4 is fitted onto the support roller 3. The distance between the bottom of the steel plate coil 4 and the first and second steering rollers 6 and 7 needs to be adjusted. The installer starts the drive rod 53, which drives the side blocks 52 on both sides to move up and down. The side blocks 52 drive the first and second steering rollers 6 and 7 to move up and down through the base plate 51, the first support plate 54 and the second support plate 55, thereby adjusting the distance between the first and second steering rollers 6 and 7 and the bottom of the steel plate coil 4. This ensures that the first and second steering rollers 6 and 7 can drive the steel plate coil 4 to rotate and adjust the weld position.

[0039] Reference Figure 4 , Figure 5 One side of the steering roller 6 is fixed to the center of the end face gear 56. The surface of the end face gear 56 meshes with the surface of the spur gear 57. One side of the spur gear 57 meshes with one end of the end face gear 58. The end face gear 58 is located on the side of the spur gear 57 away from the end face gear 56. The center of the side of the end face gear 58 away from the spur gear 57 is fixed to the surface of the steering roller 7. The spur gear 57 realizes the rotation of the steering roller 6 and the steering roller 7 through a drive structure. The drive structure includes a connecting plate 510 set on the base plate 51. The surface of the connecting plate 510 is fixed to the mounting end of the servo motor 511. The end of the spur gear 57 away from the end face gear 56 is fixed to the surface of the rotating shaft 59. The rotating shaft 59 passes through the interior of the connecting plate 510 and is rotatably connected to the connecting plate 510. The drive end of the servo motor 511 is fixedly connected to the rotating shaft 59 through a coupling. The size of the end face gear 56 is the same as that of the end face gear 58, and the number of teeth is also the same. This ensures that the rotation speed of the steering roller 6 and the steering roller 7 is synchronized. The side of the base plate 51 close to the connecting plate 510 is fixed to the surface of the protective shell 512. The protective shell 512 surrounds and protects the end face gear 56, the spur gear 57, and the end face gear 58.

[0040] When the weld position of steel plate coil 4 needs to be corrected, the operator starts the servo motor 511. The servo motor 511 drives the spur gear 57 to rotate through the rotating shaft 59. Since end face gear 1 56 and end face gear 2 58 are gears that can mesh with spur gear 57 in a direction parallel to the axis, when spur gear 57 rotates, it can simultaneously drive end face gear 1 56 and end face gear 2 58 to rotate in the same direction. End face gear 1 56 and end face gear 2 58 simultaneously drive steering roller 1 6 and steering roller 2 7 to rotate synchronously in the same direction, thereby causing steel plate coil 4 to rotate. The materials of end face gear 1 56, spur gear 57 and end face gear 2 58 are No. 45 steel, which is a medium carbon high-quality carbon structural steel to ensure its wear resistance during long-term operation.

[0041] Reference Figure 3 , Figure 5The support plate 54 and the support plate 55 are respectively fixed to the surface of a connecting rod 513 on their opposite sides. The connecting rod 513 is rotated through the threaded rod 514. The threaded end of the threaded rod 514 passes through the side block 52 and is threadedly connected to the side block 52. The threaded rod 514 is used to adjust the distance between the steering roller 6 and the steering roller 7. The length of the spur gear 57 is the same as the adjustment range length of the steering roller 6 and the steering roller 7.

[0042] When it is necessary to adjust the distance between steering roller 6 and steering roller 7, the operator rotates the threaded rod 514 to move steering roller 6 and steering roller 7 closer or further apart, thereby changing the overall width (opening of the V-shaped opening) between them. Since the length of the spur gear 57 is the same as the adjustment stroke, steering roller 6 and steering roller 7 drive end face gear 1 and end face gear 2 to move on the spur gear 57 through support plate 1 54 and support plate 2 55. End face gear 1 56 and end face gear 2 58 always maintain effective meshing with the spur gear 57.

[0043] The drive rod 53 and servo motor 511 are existing technologies, and their structural principles will not be detailed here. The drive rod 53 can be a servo electric cylinder from Limtech, and the servo motor 511 can be a servo motor from Yaskawa. The entire system is coordinated and controlled by a central PLC (Programmable Logic Controller). After the conveying device places the steel plate coil 4 on the support roller 3, the operator inputs or selects the diameter parameters of the current base roller on the human-machine interface (HMI touch screen). After receiving the signal, the PLC first controls the two drive rods 53 to move synchronously, so that the first steering roller 6 and the second steering roller 7 can reliably contact the bottom sides of the steel plate coil 4.

[0044] During the welding process, the PLC starts the servo motor 511, which drives the steel plate roll 4 to rotate through the meshing of the spur gear 57 with end face gear 56 and end face gear 58. A high-precision laser displacement sensor (Hongchuan LTH) monitors the surface of the cylinder in real time. Once it detects that the weld seam trajectory has reached the preset welding position directly above the support roller 3, it immediately sends a feedback signal to the PLC. The PLC immediately stops the servo motor 511 and sends a command to the servo tracking axis on the laser and laser welding torch 2 to start the welding program and complete the high-precision welding.

[0045] The implementation principle of an automatic laser welding machine for gravure printing plates in this application embodiment is as follows: a steel plate roll 4 is inserted into the support roller 3 through a conveying device, with its bottom located between the first guide roller 6 and the second guide roller 7. Then, the auxiliary mechanism 5 drives the first guide roller 6 and the second guide roller 7 to rotate in the same direction, thereby rotating the steel plate roll 4 so that the weld seam of the steel plate roll 4 is aligned with the top of the support roller 3 and the bottom of the laser welding gun 2 for accurate welding. Through the cooperation of the sensor and the servo motor 511, the weld seam is precisely stopped at the top position most suitable for welding on the support roller 3, avoiding the steel plate roll 4 from sliding due to inertia and causing inaccurate weld seam position.

[0046] When the base rollers of the gravure printing plates are of different sizes, the steel plate coils 4 also vary in size. The auxiliary mechanism 5 allows adjustment of the distance between the first and second guide rollers 6 and 7, as well as the distance between the guide rollers 6 and 7 and the bottom of the steel plate coil 4. This ensures that the guide rollers 6 and 7 can contact the bottom of the steel plate coil 4, thereby improving the rotation efficiency and allowing them to accommodate steel plate coils 4 of different diameters. The adjustable guide rollers 6 and 7 enable a single machine to handle steel plate coils 4 of different diameters and widths. Adjusting the threaded rod 514 changes the distance and position between the rollers to accommodate new cylinder diameters.

[0047] The above are merely optional embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An automatic laser welding machine for gravure printing plates, characterized in that: The assembly includes a frame (1) and a laser welding gun (2) slidably disposed with the frame (1). A support roller (3) is fixedly disposed inside the frame (1). A steel plate coil (4) welded into a roller by the laser welding gun (2) is movably disposed on the support roller (3). An auxiliary mechanism (5) is provided on the frame (1) for stopping the weld seam of the steel plate coil (4) at a suitable welding position in the middle of the support roller (3). A first guide roller (6) and a second guide roller (7) are provided on the moving end of the auxiliary mechanism (5) for adjusting the position of the weld seam of the steel plate coil (4) by rotating synchronously in the same direction.

2. The automatic laser welding machine for gravure printing plates according to claim 1, characterized in that: The auxiliary mechanism (5) includes a base plate (51) slidably mounted on the frame (1). Side blocks (52) are fixedly mounted on both sides of the base plate (51). A drive rod (53) for adjusting the height of the first steering roller (6) and the second steering roller (7) is symmetrically mounted on the frame (1). The drive end of the drive rod (53) is connected to the side block (52). A support plate (54) and a support plate (55) are symmetrically slidably mounted inside the base plate (51) and are respectively rotatably mounted to the first steering roller (6) and the second steering roller (7).

3. The automatic laser welding machine for gravure printing plates according to claim 2, characterized in that: One side of the first steering roller (6) is fixedly provided with an end face gear (56), and a spur gear (57) is meshed on one side of the first end face gear (56). The side of the spur gear (57) away from the first end face gear (56) is meshed with an end face gear (58) connected to the second steering roller (7). The spur gear (57) enables the first steering roller (6) and the second steering roller (7) to rotate through a drive structure.

4. The automatic laser welding machine for gravure printing plates according to claim 3, characterized in that: The drive structure includes a connecting plate (510) set on the base plate (51), a servo motor (511) is set on the connecting plate (510), and a rotating shaft (59) passing through the connecting plate (510) is set on one side of the spur gear (57), and the drive end of the servo motor (511) is connected to the rotating shaft (59).

5. An automatic laser welding machine for gravure printing plates according to claim 3, characterized in that: The dimensions and number of teeth of the first end face gear (56) and the second end face gear (58) are the same.

6. An automatic laser welding machine for gravure printing plates according to claim 2, characterized in that: A connecting rod (513) is provided on one side of both the first support plate (54) and the second support plate (55). A threaded rod (514) for adjusting the distance between the first steering roller (6) and the second steering roller (7) is rotatably provided in the connecting rod (513). The threaded rod (514) is threaded through the side block (52).

7. An automatic laser welding machine for gravure printing plates according to claim 3, characterized in that: A protective shell (512) is fixedly installed on the base plate (51), and the end face gear one (56), spur gear (57) and end face gear two (58) are all located inside the protective shell (512).

8. An automatic laser welding machine for gravure printing plates according to claim 1, characterized in that: The frame (1) is provided with a fixing mechanism (8) for maintaining the position of the weld seam of the steel plate roll (4).

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