Conveying device and laser cutting device

Abstract

The utility model relates to the technical field of laser cutting, and discloses a conveying device and a laser cutting device.The conveying device comprises a rack, a carrier roller assembly and a conveying assembly, the conveying assembly comprises a conveying belt. The carrier roller assembly comprises a plurality of carrier rollers arranged in parallel, a linkage assembly and a driving assembly. The carrier rollers are arranged on the rack, located on the lower side of the conveying belt and used for supporting the conveying belt, the carrier rollers are connected through the linkage assembly, the linkage assembly is driven by the driving assembly, the linkage assembly drives the multiple carrier rollers to move synchronously, when the multiple carrier rollers get close to one another synchronously, the distance between the carrier rollers is reduced, and then the interval supported by the carrier rollers is reduced. And when the carrier rollers are synchronously separated from one another, the distance between the carrier rollers is increased, so that the interval supported by the carrier rollers is increased, the length of the conveyor belt supported by the carrier rollers is increased, and the position change during laser head cutting is adapted by changing the length of the conveyor belt.

Description

Technical Field

[0001] The utility model relates to the technical field of laser cutting, and particularly relates to a conveying device and a laser cutting device. Background Art

[0002] Laser cutting is achieved by using the high-power density energy generated after laser focusing. Under the control of a computer, the laser is discharged by pulses, so as to output a controlled repetitive high-frequency pulsed laser, forming a light beam with a certain frequency and a certain pulse width. The pulsed laser beam is conducted and reflected through an optical path and focused on the surface of the workpiece to be processed through a focusing lens group, forming a series of fine and high-energy density light spots. The focal spot is located near the surface to be processed, melting or vaporizing the workpiece material instantly with high temperature. Each high-energy laser pulse instantly splashes out a small hole on the surface of the object. Under the control of the computer, the laser processing head and the workpiece to be processed move continuously relative to each other according to a pre-drawn pattern to dot, so that the object can be processed into the desired shape.

[0003] A laser cutting machine is a cutting machine made using the laser cutting principle. The laser cutting machine can make the laser emitted by the laser pass through an optical path system and be further focused into a laser beam with a high power density, and use the laser beam to cut and process the workpiece. When the laser cutting machine is performing cutting work, usually the laser head moves, which requires a gap, that is, a cutting seam, below the corresponding position of the workpiece to be cut, so that the laser head will not cut other components such as the workbench when cutting the workpiece. During the movement of the laser head, the cutting seam needs to move along with it. Therefore, it is necessary to change the length of the upper side of the conveyor belt to achieve the synchronous movement of the cutting seam.

[0004] Chinese Patent CN202020617972.6 discloses a multi-section belt support conveying device and a laser cutting system. The multi-section belt support conveying device includes a frame, a first conveying mechanism and a second conveying mechanism. The first conveying mechanism is movably connected to the frame; the second conveying mechanism is movably connected to the frame, and the second conveying mechanism is arranged at an interval with the first conveying mechanism to form a working space; a first driver and a second driver. The first driver can drive the first conveying mechanism to reciprocate on the frame, and the second driver can drive the second conveying mechanism to reciprocate on the frame. The first driver drives the first conveying mechanism to move on the frame, and the second driver drives the second conveying mechanism to move on the frame, so that the working space between the first conveying mechanism and the second conveying mechanism can be adjusted in position along with the movement of the laser head. However, the specific structure of the movement is not disclosed in this solution.

[0005] The utility model overcomes the shortcomings of the prior art and provides a conveying device and a laser cutting device. Summary of the Utility Model

[0006] The main object of the present utility model is to provide a conveying device, comprising: a frame, and a roller assembly and a conveying assembly provided on the frame; the conveying assembly includes a conveyor belt, and the roller assembly includes a plurality of rollers arranged in parallel, a linkage assembly and a drive assembly;

[0007] The rollers are provided on the frame, the rollers are located below the conveyor belt, the rollers are used to support the conveyor belt, the rollers are connected by a linkage assembly, the drive assembly is connected to the linkage assembly, the drive assembly drives the linkage assembly to drive the rollers to move, the distance between the rollers is synchronously enlarged or reduced, and the length of the conveyor belt supported by the rollers changes following the distance between the rollers.

[0008] Optionally, the rollers include a first roller and a second roller. The rollers located on the outermost two sides are the first rollers, and the rollers between the two first rollers are the second rollers. The distance between the two first rollers is the support interval;

[0009] The drive assembly is connected to the first roller through the linkage assembly, and the drive assembly drives the first roller to approach or move away from the second roller, thereby changing the size of the support interval.

[0010] Optionally, the linkage assembly includes a first connecting rod, a second connecting rod, a first guide rail, a roller and a first support;

[0011] The first guide rail is provided on the frame, the two ends of the roller are provided with the first supports, the roller is hinged to the first support, the roller is matched with the first guide rail, and the roller rolls along the first guide rail;

[0012] The head end of the first connecting rod is hinged to the first support through a first gear, its tail end is hinged to the tail end of the first connecting rod connected to the adjacent roller, or is connected to the tail end of the second connecting rod. Two first gears are provided on the first support, and the two first gears are meshed;

[0013] The head end of the second connecting rod is connected to the drive assembly through a hinge seat.

[0014] Optionally, the number of the rollers is 4, and 2 rollers are provided on each of the upper side and the lower side of the first guide rail.

[0015] Optionally, the first gear is a semi-gear or a full gear.

[0016] Optionally, the drive assembly includes a second support, a second guide rail, a motor, a second gear, a rack;

[0017] The second support is connected to the head end of the second connecting rod through a hinge seat. The motor is arranged on the second support. The output end of the motor is connected to the second gear. The second gear meshes with the rack. The second support is slidably connected to the second guide rail. The rack and the second guide rail are arranged in parallel on the frame, and the second guide rail is arranged in parallel with the first guide rail.

[0018] Optionally, the surface of the first roller is a discontinuous surface, and the surface of the second roller is a continuous surface. The intervals between the discontinuous surfaces of the first roller are used for the insertion of the fork bars to form a continuous surface.

[0019] Optionally, the conveying assembly further includes a tensioning mechanism and a driving roller. The conveyor belt is wound around the tensioning mechanism and the driving roller;

[0020] The driving roller is arranged on the frame, in the same plane as and parallel to the rollers. The driving roller is provided with fork bars, and the driving roller drives the conveyor belt to move;

[0021] The tensioning mechanism is arranged on the frame, below the rollers. The tensioning mechanism is used to tension the conveyor belt.

[0022] Optionally, the number of the roller assemblies is three. The roller assemblies on both sides are the first roller assemblies, and the roller assembly in the middle is the second roller assembly.

[0023] The first roller away from the frame port in the first roller assembly is connected to the driving assembly. The two first rollers in the second roller assembly can move synchronously closer to or away from each other.

[0024] The present utility model further provides a laser cutting device, including the above-mentioned conveying device, and further including a laser assembly. The laser assembly is arranged on the conveying device.

[0025] Compared with the prior art, the present utility model has the following beneficial effects:

[0026] For the conveying device provided by the present utility model, the driving assembly drives the linkage assembly, so that the linkage assembly drives multiple rollers to move synchronously. When the multiple rollers move synchronously closer to each other, the distance between the rollers decreases, and thus the supported section of the rollers decreases. At this time, the length of the conveyor belt supported by the rollers becomes shorter. When the multiple rollers move synchronously away from each other, the distance between the rollers increases, and thus the supported section of the rollers increases. At this time, the length of the conveyor belt supported by the rollers becomes longer. By changing the conveying length on the upper side of the conveyor belt, it adapts to the change in the position during the cutting by the laser head. Description of the Drawings

[0027] One or more embodiments are exemplarily illustrated by corresponding drawings. These exemplary illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements, unless otherwise stated. The drawings in the figures do not constitute a scale limitation.

[0028] Figure 1 Schematic diagram of an embodiment of the conveying device of the present utility model;

[0029] Figure 2 Partial enlarged view of part A of the embodiment of the conveying device of the present utility model;

[0030] Figure 3 Schematic diagram of the idler assembly of the embodiment of the conveying device of the present utility model;

[0031] Figure 4 Partial enlarged view of part B of the embodiment of the conveying device of the present utility model;

[0032] Figure 5 Schematic diagram of the linkage assembly of the embodiment of the conveying device of the present utility model;

[0033] Figure 6 Schematic diagram of an embodiment of the laser cutting device of the present utility model;

[0034] Figure 7 Side view of the embodiment of the laser cutting device of the present utility model.

[0035] Reference numerals:

[0036] 1 - Frame; 2 - Idler assembly; 21 - Idler; 211 - First idler; 212 - Second idler; 22 - Linkage assembly; 221 - First connecting rod; 222 - Second connecting rod; 223 - First guide rail; 224 - Roller; 225 - First support; 226 - First gear; 227 - Hinge seat; 23 - Driving assembly; 231 - Second support; 232 - Second guide rail; 233 - Motor; 234 - Rack; 3 - Conveying assembly; 31 - Conveyor belt; 32 - Tensioning mechanism; 33 - Driving roller; 34 - Fork bar; 4 - Laser assembly; 41 - Laser head; 42 - Cross beam; 43 - Dust suction mechanism; 5 - Cutting seam; a - First idler assembly; b - Second idler assembly. Detailed implementation manners

[0037] For the convenience of understanding the present utility model, the present utility model will be described in more detail below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is expressed as "fixed to" another element, it can be directly on the other element, or there can be one or more intermediate elements therebetween. When an element is expressed as "connected to" another element, it can be directly connected to the other element, or there can be one or more intermediate elements therebetween. The terms "vertical", "horizontal", "left", "right", "inner", "outer" and similar expressions used in this specification are only for the purpose of illustration. In the description of the present utility model, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating relative importance or implicitly indicating the quantity of the indicated technical features. Thus, unless otherwise stated, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features; the meaning of "a plurality" is two or more. The term "comprising" and any deformation thereof means non-exclusive inclusion, and there may be or be added one or more other features, integers, steps, operations, units, components and / or combinations thereof.

[0038] In addition, unless otherwise clearly specified and defined, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, or it can be the communication inside two elements. All the technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the technical field to which the present utility model belongs. The terms used in the description of the present utility model are only for the purpose of describing specific embodiments and are not applicable to limiting the present utility model. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0039] In addition, the technical features involved in different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0040] As Figures 1-5 shown, it is a schematic diagram of an embodiment of a conveying device provided by the present utility model.

[0041] Please refer to Figures 1-5 , this embodiment is used for the conveyance of workpieces in a laser cutting device, and the conveyance length on the upper side of the conveyor belt can be adaptively changed according to the position of the laser head.

[0042] This embodiment specifically includes a frame 1, a roller assembly 2, and a conveying assembly 3. The roller assembly 2 and the conveying assembly 3 are arranged on the frame 1. The conveying assembly 3 includes a conveyor belt 31, and the conveyor belt 31 is used to carry workpieces and drive the workpieces to move along the conveying direction of the conveyor belt 31. The roller assembly 2 includes a plurality of rollers 21 arranged in parallel, a linkage assembly 22, and a driving assembly 23.

[0043] The rollers 21 are arranged on the frame 1. The rollers 21 are located on the lower side of the conveyor belt 31. The rollers 21 are used to support the conveyor belt 31. The rollers 21 are rotatable and rotate during the conveying movement of the conveyor belt 31. The rollers 21 are connected to each other by the linkage assembly 22. The driving assembly 23 is connected to the linkage assembly 22. The driving assembly 23 drives the linkage assembly 22 to drive the rollers 21 to move. The distance between the rollers 21 is enlarged or reduced synchronously. The length of the conveyor belt 31 supported by the rollers 21 changes following the distance between the rollers 21. When the distance between the rollers 21 is enlarged synchronously, the conveying distance of the conveyor belt 31 becomes longer. When the distance between the rollers 21 is reduced synchronously, the conveying distance of the conveyor belt 31 becomes shorter.

[0044] The frame 1 includes a long-side cross bar and a short-side vertical bar. The two ends of the roller 21 are respectively arranged on the two side cross bars of the frame 1, perpendicular to the cross bars. The conveyor belt 31 is located between the two cross bars and is arranged parallel to the direction of the cross bars.

[0045] In one embodiment, the roller 21 includes a first roller 211 and a second roller 212. The rollers 21 located on the outermost two sides are the first rollers 211. The rollers 21 between the two first rollers 211 are the second rollers 212. The distance between the two first rollers 211 is the support interval. The driving assembly 23 is connected to the first roller 211 through the linkage assembly 22. The driving assembly 23 drives the first roller 211 to approach or move away from the second roller 212, thereby changing the size of the support interval.

[0046] The number of the first rollers 211 is specifically 2. The number of the second rollers 212 between the two first rollers 211 is multiple. In this embodiment, 4 are specifically adopted. When the driving assembly 23 drives the first roller 211 to approach the second roller 212, the movement of the first roller 211 causes the linkage assembly 22 to drive the distance between the second rollers 212 to be compressed, so that the distance between the first roller 211 and the second roller 212, and the distance between the multiple second rollers 212 are reduced synchronously, resulting in the reduction of the support interval. When the driving assembly 23 drives the first roller 211 to move away from the second roller 212, the movement of the first roller 211 causes the linkage assembly 22 to drive the distance between the second rollers 212 to be enlarged, so that the distance between the first roller 211 and the second roller 212, and the distance between the multiple second rollers 212 are enlarged synchronously, resulting in the increase of the support interval.

[0047] In one embodiment, as Figures 3-5As shown, the linkage component 22 includes a first connecting rod 221, a second connecting rod 222, a first guide rail 223, a roller 224, and a first support 225. The first guide rail 223 is provided on the frame 1. First supports 225 are provided at both ends of the idler 21. The roller 224 is hinged to the first support 225. The roller 224 is matched with the first guide rail 223, and the roller 224 rolls along the first guide rail 223.

[0048] The head end of the first connecting rod 221 is hinged to the first support 225 through a first gear 226, and its tail end is hinged to the tail end of the first connecting rod 221 connected to the adjacent idler 21, or connected to the tail end of the second connecting rod 222. Two first gears 226 are provided on the first support 225, and the two first gears 226 are meshed. The head end of the second connecting rod 222 is connected to the driving component 23 through a hinge seat 227.

[0049] The setting direction of the first guide rail 223 is parallel to the moving direction of the conveyor belt 31. Under the driving force of the driving component 22, the first support 225 moves along the first guide rail 223 through the roller 224, thereby driving the idler 21 connected to the first support 225 to move along the direction of the first guide rail 223. Two first connecting rods 221 are connected between adjacent second idlers 212. The two first connecting rods 221 are arranged at an angle. When the distance between the second idlers 212 increases, the angle increases. When the distance between the second idlers 212 decreases, the angle decreases.

[0050] The first support 225 is connected to two first connecting rods 221. The two first connecting rods 221 are meshed through a first gear 226. When one of the first connecting rods 221 rotates around the connection point, it drives the other first connecting rod 221 to rotate around the connection point.

[0051] The first support 225 connected to the outermost first idler 211 is connected to two first connecting rods 221. The tail end of the outer first connecting rod 221 is connected to the tail end of the second connecting rod 222. The head end of the second connecting rod 222 is connected to the second support 231 in the driving component 23 through a hinge seat 227. When the motor 233 in the driving component 23 drives the second support 231 to move along the second guide rail 232, it drives the hinge seat 227 to move synchronously, thereby changing the angle between the second connecting rod 222 and the first connecting rod 221 connected to the first idler 211, and changing the angle between the two first connecting rods 221 between the second idlers 212, realizing the synchronous movement between the idlers 21. In addition, the head end of the second connecting rod 222 can also be hinged to the frame 1.

[0052] Further, as Figure 5As shown, the number of rollers 224 is 4. Two rollers 224 are provided on each of the upper and lower sides of the first guide rail 223 to limit the vertical displacement of the first support 225 and prevent derailment. The roller 224 may specifically be a V-shaped roller, and the first guide rail 223 may specifically be a V-shaped slide rail.

[0053] The first gear 226 is a semi-gear or a full gear. The semi-gear means that the teeth of the first gear 226 are only half a turn or less. The rotation range of the first gear 226 is restricted by the teeth, and then the rotation angle of the first connecting rod 221 is restricted, so as to limit the maximum and minimum distances between the idler rollers 21 when the idler roller 21 moves.

[0054] In one embodiment, the driving assembly 23 includes a second support 231, a second guide rail 232, a motor 233, a second gear (not shown), and a rack 234. The second support 231 is connected to the head end of the second connecting rod 222 through a hinge seat 227. The motor 233 is arranged on the second support 231. The output end of the motor 233 is connected to the second gear. The second gear meshes with the rack 234. The second support 231 is slidably connected to the second guide rail 232. The rack 234 and the second guide rail 232 are arranged in parallel on the frame 1, and the second guide rail 232 is arranged in parallel with the first guide rail 223.

[0055] The transmission of the gear and rack is a conventional transmission method, which will not be elaborated. The motor 233 drives the second support 231 to move along the second guide rail 232, and then drives the hinge seat 227 to move synchronously, and then realizes the linkage between the idler rollers 21 through the second connecting rod 222 and the first connecting rod 221. The second support 231 may specifically be the support where the laser assembly is located. The second support 231 moves synchronously with the laser assembly 4. When the laser assembly 4 moves, the length of the conveyor belt 31 and the position of the cutting seam 5 are changed synchronously.

[0056] In one embodiment, the surface of the first idler roller 211 is a discontinuous surface, and the surface of the second idler roller 212 is a continuous surface. The interval between the discontinuous surfaces of the first idler roller 211 is used for the fork bar to be inserted to form a continuous surface. Since the fork bar 34 is provided on the second support 231 where the driving roller 33 and the laser assembly 4 are located, in order to avoid interference between the outermost first idler rollers 211 at both ends and the fork bar 34, the surface of the first idler roller 211 is a discontinuous surface and can accommodate the fork bar 34 to be inserted. The fork bar 34 is used to increase the contact area with the conveyor belt 31, so that the contact surface with the conveyor belt at this place is a continuous plane.

[0057] In one embodiment, the conveying assembly 3 further includes a tensioning mechanism 32 and a driving roller 33. The conveyor belt 31 is wound around the tensioning mechanism 32 and the driving roller 33. The driving roller 33 is arranged on the frame 1, is located in the same plane as the idler roller 21 and is arranged parallel to each other. The driving roller 33 is provided with a fork bar 34, and the driving roller 33 drives the conveyor belt 31 to move. The driving rollers 33 are arranged at both ends of the frame 1 and are driven by a motor to drive the conveyor belt 31 to move.

[0058] The tensioning mechanism 32 is arranged on the frame 1 and is located below the idler 21. The tensioning mechanism 32 is used to tension the conveyor belt 31. When the distance between the idlers 21 changes, the length of the conveyor belt 31 supported changes, and the tensioning mechanism 32 correspondingly adjusts the tightness of the conveyor belt 31 to keep the conveyor belt 31 in a stable plane.

[0059] In one embodiment, the number of the idler assemblies 2 is 3. The idler assemblies on both sides are the first idler assemblies a, and the idler assembly in the middle is the second idler assembly b.

[0060] The first idler 211 away from the port of the frame 1 in the first idler assembly a is connected to the driving assembly 23. Specifically, the head end of the second connecting rod 222 in the first idler 211 away from the port of the frame 1 in the first idler assembly a is connected to the second support 231 in the driving assembly 23, and the head end of the second connecting rod 222 in the other first idler 211 is hinged to the frame 1.

[0061] The two first idlers 211 in the second idler assembly b can move synchronously closer to or away from each other. That is, the head ends of the second connecting rods 222 of the two first idlers 211 in the second idler assembly b are respectively connected to a second support 231 in the driving assembly 23.

[0062] As Figures 6-7 shown, the present utility model also provides an embodiment of a laser cutting device, which includes the above-mentioned conveying device and also includes a laser assembly 4. The laser assembly 4 is arranged on the frame 1. The number of the laser assemblies 4 in this embodiment is 2, and the 2 laser assemblies 4 are respectively located between adjacent idler assemblies 2.

[0063] The laser assembly 4 includes a laser head 41, a cross beam 42 and a dust suction mechanism 43. The direction of the cross beam 42 is perpendicular to the moving direction of the conveyor belt 31. The two ends of the cross beam 42 are respectively connected to the second supports 231 in the idler assemblies 2. The laser head 41 is connected to the cross beam 42 through a servo motor and can move on the cross beam 42. Below the laser head 41 is a cutting seam 5. A dust suction mechanism 43 is arranged at the cutting seam 5.

[0064] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting it; under the concept of the present invention, the technical features in the above embodiments or different embodiments can also be combined, and the steps can be implemented in any order, and there are many other variations in different aspects of the present invention as described above. For the sake of brevity, they are not provided in detail; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A conveying device, characterized in that, Comprising: A frame, and a roller assembly and a conveying assembly provided on the frame; the conveying assembly includes a conveyor belt, and the roller assembly includes a plurality of rollers arranged in parallel, a linkage assembly and a driving assembly; The rollers are provided on the frame, the rollers are located below the conveyor belt, the rollers are used to support the conveyor belt, the rollers are connected by a linkage assembly, the driving assembly is connected to the linkage assembly, the driving assembly drives the linkage assembly to drive the rollers to move, the distance between the rollers is synchronously enlarged or reduced, and the length of the conveyor belt supported by the rollers changes following the distance between the rollers.

2. The conveying device according to claim 1, characterized in that, The rollers include a first roller and a second roller, the rollers located on the outermost two sides are the first rollers, and the rollers between the two first rollers are the second rollers, and the distance between the two first rollers is the support interval; The driving assembly is connected to the first roller through the linkage assembly, the driving assembly drives the first roller to approach or move away from the second roller, thereby changing the size of the support interval.

3. The conveying device according to claim 2, characterized in that, The linkage assembly includes a first connecting rod, a second connecting rod, a first guide rail, rollers and a first support; The first guide rail is provided on the frame, the two ends of the roller are provided with the first support, the rollers are hinged to the first support, the rollers are matched with the first guide rail, and the rollers roll along the first guide rail; The head end of the first connecting rod is hinged to the first support through a first gear, the tail end of the first connecting rod is hinged to the tail end of the first connecting rod connected to the adjacent roller, or is connected to the tail end of the second connecting rod, and two first gears are provided on the first support, and the two first gears are meshed; The head end of the second connecting rod is connected to the driving assembly through a hinge seat.

4. The conveying device according to claim 3, characterized in that, The number of the rollers is 4, and 2 rollers are provided on each of the upper side and the lower side of the first guide rail.

5. The conveying device according to claim 3, characterized in that, The first gear is a semi-gear or a full gear.

6. The conveying device according to claim 3, characterized in that The driving assembly includes a second support, a second guide rail, a motor, a second gear and a rack; The second support is connected to the head end of the second connecting rod through a hinge seat, the motor is provided on the second support, the output end of the motor is connected to the second gear, the second gear is meshed with the rack, the second support is slidably connected to the second guide rail, the rack and the second guide rail are arranged in parallel on the frame, and the second guide rail is arranged in parallel with the first guide rail.

7. The conveying device according to claim 2, wherein The surface of the first roller is a discontinuous surface, the surface of the second roller is a continuous surface, and the interval between the discontinuous surfaces of the first rollers is used for inserting a fork bar to form a continuous surface.

8. The conveying device according to claim 2, wherein, The conveying assembly further includes a tensioning mechanism and a driving roller, and the conveyor belt winds around the tensioning mechanism and the driving roller; The driving roller is provided on the frame, is arranged in the same plane as the rollers and is parallel to each other, the driving roller is provided with a fork bar, and the driving roller drives the conveyor belt to move; The tensioning mechanism is provided on the frame, is located below the rollers, and the tensioning mechanism is used to tension the conveyor belt.

9. The conveying device according to claim 2, wherein The number of the roller assemblies is 3, the roller assemblies on both sides are the first roller assemblies, and the roller assembly in the middle is the second roller assembly, The first idler in the first idler assembly, which is away from the frame port, is connected to the drive assembly, and the two first idlers in the second idler assembly can move synchronously closer to or away from each other.

10. A laser cutting device, characterized in that, It includes the conveying device according to any one of claims 1-9, and further includes a laser assembly, and the laser assembly is arranged on the conveying device.

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