Tailored blank laser welding plate bottom surface cleaning device

Abstract

The utility model relates to the technical field of automobile production, in particular to a tailored blank laser welding bottom surface cleaning device which comprises a discharging conveying frame, an auxiliary pushing mechanism, a quick-change cleaning roller and a quick-change brush roller which are sequentially arranged in the conveying direction, and a first in-place sensor arranged at the feeding position of the discharging conveying frame. The first in-place sensor is arranged at the discharging position of the discharging conveying frame, the second in-place sensor is arranged at the discharging position of the discharging conveying frame, the controller is connected with the first in-place sensor and the in-place sensor, and the controller is connected with the auxiliary pushing mechanism. The lower surface cleaning device aims at solving the problem that no lower surface cleaning device exists in the tailored blank laser welding process in the current automobile stamping production, and smoke dust, chippings and oxide skin on the lower surface of a tailored blank can be synchronously removed when the tailored blank laser welding device discharges through double cleaning of the quick-change cleaning roller and the brush roller. Welding quality and product appearance are effectively improved, automatic operation is achieved, manual intervention is reduced, and production efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of automotive manufacturing technology, and in particular to a device for cleaning the bottom surface of laser-welded plates. Background Technology

[0002] In automotive stamping production, laser welding is applied to the processing of door panel blanks. This process combines materials of different thicknesses into a single blank, achieving both strength and weight reduction while saving manufacturing costs. However, weld slag residue is unavoidable during laser welding. This residue not only affects weld strength and sealing but also negatively impacts subsequent processing. Currently, during laser welding, welding fumes, debris, and slag adhere to the lower surface of the welded plate, affecting weld quality, product appearance, and subsequent processing steps.

[0003] Existing traditional automotive stamping production plants use outdated laser equipment, equipped only with dust collection devices for the upper surface of flat sheet welding, while the lower surface lacks any cleaning equipment. Introducing cleaning equipment, upgrading to new laser welding equipment, or outsourcing upgrades are costly. With the widespread application of laser welding technology, the requirements for welding quality are increasing, making the issue of lower surface cleaning an urgent problem to be solved. Utility Model Content

[0004] Therefore, the purpose of this invention is to overcome the problem of the lack of a bottom surface cleaning device in the laser welding process of current automotive stamping production, and to provide a bottom surface cleaning device for laser-welded plates. This invention, through the dual cleaning of quick-change cleaning rollers and brush rollers, can simultaneously remove smoke, dust, debris, and oxide scale from the bottom surface of the welded plate during the laser welding process, effectively improving welding quality and product appearance, achieving automated operation, reducing manual intervention, and increasing production efficiency.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] A laser-welded plate bottom surface cleaning device includes a discharge conveyor frame, an auxiliary pushing mechanism, a quick-change cleaning roller and a quick-change brush roller arranged sequentially along the conveying direction, a first positioning sensor located at the loading position of the discharge conveyor frame, a second positioning sensor located at the unloading position of the discharge conveyor frame, and a controller connected to the first positioning sensor and the second positioning sensor respectively. The controller is connected to the auxiliary pushing mechanism.

[0007] This invention can be used for cleaning the bottom surface of laser-welded plates. When the welded plate is placed on the discharge conveyor by a robot, the first positioning sensor sends a positioning signal to the controller. The controller then sends a control signal to the auxiliary pushing mechanism, which pushes the welded plate downwards. After the welded plate passes through the quick-change cleaning roller and quick-change brush roller, efficient cleaning of the lower surface is achieved during the discharge process. The quick-change cleaning roller effectively removes smoke, dust, and welding slag from the lower surface of the welded plate. The quick-change brush roller supplements the cleaning effect of the quick-change cleaning roller, removing fine particles and stubborn impurities that the quick-change cleaning roller cannot completely remove, further removing residual smoke and dust, and ensuring the cleanliness of the lower surface of the welded plate. This process continues until the second positioning sensor at the lower position sends a positioning signal to the controller. The controller then sends a control signal to the auxiliary pushing mechanism, which resets. The quick-change cleaning roller, quick-change brush roller, and auxiliary pushing mechanism constitute a complete modular device that can be installed at the discharge position of the laser welding equipment via the discharge conveyor to achieve synchronous cleaning during production.

[0008] This invention can be widely applied to various laser welding equipment. It adds a bottom surface cleaning function to the laser welding production process, and is especially suitable for the renovation of old equipment. It can simultaneously and efficiently clean the bottom surface of the welded plate during the welding process, and has high practicality and economy. Through the dual cleaning of quick-change cleaning rollers and brush rollers, it can effectively remove smoke, dust, debris and oxide scale from the bottom surface of the welded plate, improve welding quality and product appearance, realize automated operation, reduce manual intervention and improve production efficiency.

[0009] Furthermore, the auxiliary pushing mechanism includes a telescopic cylinder and an auxiliary push rod located at the output end of the telescopic cylinder, the axis of which is perpendicular to the conveying direction. An auxiliary pushing mechanism is installed in front of the quick-change cleaning roller and quick-change brush roller to smoothly push the welded plate out of the discharge conveyor frame. The auxiliary pushing mechanism is driven by the telescopic cylinder to ensure that the welded plate does not shift or jam during the cleaning process, thus improving discharge efficiency.

[0010] Furthermore, the discharge conveyor frame includes a support frame and a plurality of rollers disposed on the support frame along the conveying direction.

[0011] Furthermore, the quick-change brush roller includes a roller brush, and a face-changing end and a quick-insertion end respectively disposed at both ends of the quick-change brush roller, wherein the axis of the roller brush is arranged perpendicular to the conveying direction.

[0012] Furthermore, the face-changing end includes a first shaft with one end coaxially connected to the roller brush, the other end of the first shaft being a hexagonal end, and also includes an internal hexagonal connector that mates with the hexagonal end, the internal hexagonal connector being fixed on the discharge conveyor frame; the quick-connect end includes a second shaft with one end coaxially connected to the roller brush, the other end of the second shaft being provided with a spring-loaded pin, and also includes an internal circular hole connector that mates with the spring-loaded pin, the internal circular hole connector being provided on the discharge conveyor frame, the discharge conveyor frame also being provided with a quick-change auxiliary hole coaxially communicating with the internal circular hole connector.

[0013] The quick-change brush roller is installed behind the quick-change cleaning roller. It has a high bristle density and is used to further remove residual smoke and debris. Because the fixed side of the roller brush and the welded plate in the quick-change brush roller are prone to wear due to repeated friction, the bristle direction needs to be changed periodically or the entire roller brush needs to be replaced. One end of the quick-change brush roller shaft is connected by a hexagonal end, and the other end is connected by a flexible spring-loaded pin. During replacement, an external thin rod can be inserted through the quick-change auxiliary hole to push out the spring-loaded pin, allowing the entire roller brush to be disassembled. The roller brush can be rotated to switch the insertion surfaces of the hexagonal end and the internal hexagonal connector, enabling the roller brush to be switched between six sides for different cleaning operations, increasing its service life. After adjusting the cleaning surface of the roller brush, simply press the spring-loaded pin into the inner round hole connector to achieve quick disassembly and assembly of the roller brush. The detachable design of the brush roller enables quick disassembly and replacement of consumables.

[0014] Furthermore, the roller brush and the first shaft are connected by a concave retaining ring, and the concave retaining ring is provided with a first locking bolt that passes through the concave retaining ring and abuts against the first shaft; the roller brush and the second shaft are connected by a convex retaining ring, and the convex retaining ring is provided with a second locking bolt that passes through the convex retaining ring and abuts against the second shaft.

[0015] Furthermore, the roller brush is composed of several roller brush units spliced ​​together. Each roller brush unit has a concave key and a convex key at both ends. Adjacent roller brush units are connected by the concave key and the convex key. The concave key on one side of the roller brush is engaged with the convex fixing ring, and the convex key on the other side of the roller brush is engaged with the convex fixing ring.

[0016] A roller brush is composed of several roller brush units arranged and assembled. In actual use, the wear and tear of roller brushes in different areas is not uniform, with some areas experiencing more wear and tear. Replacing the entire roller brush is costly. This invention sets the roller brush as several combinable roller brush units. When performing replacement and maintenance, only certain roller brush units can be replaced, which greatly extends the service life.

[0017] Furthermore, the end faces of the convex and concave fixing rings are also provided with anti-rotation keys, and the concave and convex keys are provided with anti-rotation grooves that cooperate with the anti-rotation keys. During operation, the roller brush may be driven to rotate by the movement of the welded plate, thus affecting the cleaning effect. This invention achieves the anti-rotation effect of the roller brush by setting anti-rotation keys and anti-rotation grooves on the convex and concave fixing rings.

[0018] Furthermore, the anti-rotation key has a raised end face, and there is at least one anti-rotation key. The number of anti-rotation grooves corresponds to the number of anti-rotation keys.

[0019] Furthermore, the quick-change cleaning roller includes a roller shaft erected perpendicular to the conveying direction, and an industrial scouring pad wrapped around the roller shaft.

[0020] Furthermore, the roller and the industrial scouring pad are connected by Velcro.

[0021] After laser welding is completed, the welded plate is sent to the unloading process, where a set of quick-change cleaning rollers is installed. The quick-change cleaning rollers are made of wear-resistant materials such as industrial scouring pads, polyurethane, or nylon. The surface is elastic and rough, which can effectively remove smoke, dust, debris, and welding slag from the lower surface of the welded plate without scratching the appearance of the blank. The friction between the quick-change cleaning rollers and the lower surface of the welded plate removes smoke, dust, debris, and welding slag. The cleaning material is attached to the roller shaft with Velcro for quick replacement.

[0022] Compared with the prior art, the beneficial effects of this utility model are:

[0023] (1) This utility model can effectively remove smoke, dust and oxide scale from the lower surface of the welded plate through the dual cleaning of quick-change cleaning roller and quick-change brush roller, thereby improving welding quality and product appearance.

[0024] (2) This utility model achieves automated operation through the first positioning sensor, the second positioning sensor and the controller, thereby reducing manual intervention and improving production efficiency.

[0025] (3) This utility model has a simple structure, is easy to install and maintain, and can be widely used in various laser welding equipment. It adds a bottom cleaning function during the laser welding production process, and is especially suitable for the transformation of old equipment. It can clean the bottom surface of the welding plate simultaneously and efficiently when welding material is cut, and has high practicality and economy. Attached Figure Description

[0026] Figure 1 This is a top view of the overall structure in one embodiment (where the arrows indicate the conveying direction).

[0027] Figure 2 This is a front view of the overall structure in one embodiment (where the arrow indicates the conveying direction);

[0028] Figure 3 This is a schematic diagram of the overall structure of the quick-change brush roller in one embodiment;

[0029] Figure 4 An exploded view of a quick-change brush roller in one embodiment;

[0030] Figure 5 This is a schematic diagram of the structure of a single roller brush unit in one embodiment;

[0031] Figure 6 This is a schematic diagram of the end face of a single roller brush unit in one embodiment;

[0032] Figure 7 This is a schematic diagram of the concave fixing ring in one embodiment;

[0033] Figure 8 This is a schematic diagram of the quick-change cleaning roller and quick-change brush roller in one embodiment.

[0034] 1-Discharge conveyor frame, 11-Support frame, 12-Roller, 13-Quick-change auxiliary hole, 2-Auxiliary pushing mechanism, 21-Telescopic cylinder, 22-Auxiliary push rod, 3-Quick-change cleaning roller, 31-Roller shaft, 32-Industrial scouring pad, 33-Hook and loop fastener, 4-Quick-change brush roller, 41-Roll brush, 42-First shaft, 43-Hexagonal end, 44-Internal hexagonal connector, 45-Second shaft, 46-Spring pin, 47-Internal round hole connector, 48-Concave retaining ring, 49-Convex retaining ring, 40-Anti-rotation key, 400-Anti-rotation groove, 411-Roll brush unit. Detailed Implementation

[0035] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0036] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0037] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0038] Example 1

[0039] like Figure 1 and Figure 2 The first embodiment of this utility model is shown, which discloses a laser-welded plate bottom surface cleaning device, including a discharge conveyor frame 1, an auxiliary pushing mechanism 2, a quick-change cleaning roller 3 and a quick-change brush roller 4 arranged sequentially along the conveying direction, a first positioning sensor located at the loading position of the discharge conveyor frame 1, a second positioning sensor located at the unloading position of the discharge conveyor frame 1, and a controller connected to the first positioning sensor and the positioning sensor respectively. The controller is connected to the auxiliary pushing mechanism 2.

[0040] like Figure 1 As shown, the auxiliary pushing mechanism 2 includes a telescopic cylinder 21 and an auxiliary push rod 22 located at the output end of the telescopic cylinder 21. The axis of the auxiliary push rod 22 is perpendicular to the conveying direction. An auxiliary pushing mechanism 2 is installed in front of the quick-change cleaning roller 3 and the quick-change brush roller 4 to smoothly push the welded plate out of the discharge conveyor frame 1. The auxiliary pushing mechanism 2 is driven by the telescopic cylinder 21 to ensure that the welded plate does not shift or jam during the cleaning process, thereby improving the discharge efficiency.

[0041] like Figure 1 As shown, the discharge conveyor frame 1 includes a support frame 11 and a plurality of rollers 12 arranged on the support frame 11 along the conveying direction.

[0042] The working principle of this embodiment is as follows: When the welding plate is placed on the discharge conveyor 1 by the robot, the first positioning sensor sends a positioning signal to the controller. The controller sends a control signal to the auxiliary pushing mechanism 2. The auxiliary pushing mechanism 2 pushes the welding plate to move downwards. After the welding plate passes through the quick-change cleaning roller 3 and quick-change brush roller 4, efficient cleaning of the lower surface is achieved during the welding plate discharge process. The quick-change cleaning roller 3 effectively removes smoke, dust, and welding slag from the lower surface of the welding plate. The quick-change brush roller 4 supplements the cleaning effect of the quick-change cleaning roller 3, and can remove fine particles and stubborn impurities that the quick-change cleaning roller 3 cannot completely remove, further removing residual smoke and dust, and ensuring the cleanliness of the lower surface of the welding plate. Until the second positioning sensor at the current position sends a positioning signal to the controller, the controller sends a control signal to the auxiliary pushing mechanism 2, and the auxiliary pushing mechanism 2 resets. The quick-change cleaning roller 3, quick-change brush roller 4, and auxiliary pushing mechanism 2 constitute a complete modular device, which can be installed at the discharge position of the laser welding equipment through the discharge conveyor 1 to achieve synchronous cleaning function during production.

[0043] The advantages of this embodiment are: it can be widely applied to various laser welding equipment, especially suitable for the renovation of old equipment, and has high practicality and economy; through the dual cleaning of quick-change cleaning roller 3 and brush roller, it can effectively remove smoke, dust and oxide scale from the lower surface of the welded plate, improve welding quality and product appearance, realize automated operation, reduce manual intervention and improve production efficiency.

[0044] Example 2

[0045] This embodiment is similar to Embodiment 1, except that in this embodiment:

[0046] like Figure 3 As shown, the quick-change brush roller 4 includes a roller brush 41, and a face-changing end and a quick-insertion end respectively disposed at both ends of the quick-change brush roller 4. The axis of the roller brush 41 is set perpendicular to the conveying direction.

[0047] like Figure 4 As shown, the face-changing end includes a first shaft 42 coaxially connected to the roller brush 41 at one end, and a hexagonal end 43 at the other end of the first shaft 42. It also includes an internal hexagonal connector 44 that mates with the hexagonal end 43. The internal hexagonal connector 44 is fixed on the discharge conveyor frame 1. The quick-connect end includes a second shaft 45 coaxially connected to the roller brush 41 at one end, and a spring pin 46 connected to the other end of the second shaft 45. It also includes an internal round hole connector 47 that mates with the spring pin 46. The internal round hole connector 47 is located on the discharge conveyor frame 1. The discharge conveyor frame 1 is also provided with a quick-change auxiliary hole 13 that coaxially communicates with the internal round hole connector 47.

[0048] In this embodiment, the internal hexagonal connector 44 is welded to the support frame 11, the internal round hole connector 47 is welded to the support frame 11 on the other side, and the quick-change auxiliary hole 13 passes through the side wall of the support frame 11.

[0049] The quick-change brush roller 4 is installed behind the quick-change cleaning roller 3. It has a high bristle density and is used to further remove residual smoke and debris. Because the roller brush 41 in the quick-change brush roller 4 is prone to wear due to repeated friction between the fixed side and the welded plate, it is necessary to change the bristle direction or replace the entire roller brush 41 regularly. One end of the shaft of the quick-change brush roller 4 is connected by a hexagonal end 43, and the other end is connected by a flexible spring pin 46. When replacing, an external thin rod can be inserted into the quick-change auxiliary hole 13 and the spring pin 46 can be pushed out to disassemble the entire roller brush 41. The roller brush 41 can be rotated to switch the insertion surface of the hexagonal end 43 and the internal hexagonal connector 44, so that the roller brush 41 can be switched to six sides. Different sides can be used for cleaning operations to increase service life. After adjusting the cleaning surface of the roller brush 41, the spring pin 46 can be pressed and snapped into the inner round hole connector 47 to realize the quick disassembly and assembly of the roller brush 41. The detachable design of the brush roller realizes the function of quick disassembly and quick replacement of consumables.

[0050] like Figure 4 As shown, the roller brush 41 and the first shaft 42 are connected by a concave retaining ring 48, and a first locking bolt is provided on the concave retaining ring 48 and abuts against the first shaft 42; the roller brush 41 and the second shaft 45 are connected by a convex retaining ring 49, and a second locking bolt is provided on the convex retaining ring 49 and abuts against the second shaft 45.

[0051] In this embodiment, there are two first locking bolts and two second locking bolts. The axes of the two first locking bolts are set at a 90° angle, which can achieve better anti-rotation and fixing effect.

[0052] like Figure 3 and Figure 5 As shown, the roller brush 41 is composed of several roller brush units 411 spliced ​​together. Each roller brush unit 411 has a concave key and a convex key at both ends. Adjacent roller brush units 411 are connected by the concave key and the convex key. The concave key on one side of the roller brush 41 is engaged with the convex fixing ring 49, and the convex key on the other side of the roller brush 41 is engaged with the convex fixing ring 49.

[0053] The roller brush 41 is composed of several roller brush units 411 arranged and spliced ​​together. In actual use, the wear and tear of the roller brush 41 in different areas is not uniform, and some areas have more wear and tear. Replacing the entire roller brush 41 is costly. This utility model sets the roller brush 41 as several roller brush units 411 that can be spliced ​​together. When replacing and maintaining, some roller brush units 411 can be replaced, which greatly improves the service life.

[0054] like Figure 6 and Figure 7 As shown, the end faces of the convex fixing ring 49 and the concave fixing ring 48 are also provided with anti-rotation keys 40, and the concave and convex keys are provided with anti-rotation grooves 400 that cooperate with the anti-rotation keys 40. During operation, the roller brush 41 may be driven to rotate by the movement of the welded plate, thus affecting the cleaning effect. This utility model achieves the anti-rotation effect of the roller brush 41 by setting anti-rotation keys 40 and anti-rotation grooves 400 on the convex fixing ring 49 and the concave fixing ring 48.

[0055] like Figure 7 As shown, the anti-rotation key 40 is a raised end face, and there is at least one anti-rotation key 40. The number of anti-rotation grooves 400 corresponds to the number of anti-rotation keys 40.

[0056] In this embodiment, there are two sets of quick-change brush rollers 4, and the two sets of quick-change brush rollers 4 are arranged in parallel along the conveying direction.

[0057] The other structures and principles of this embodiment are the same as those of Embodiment 1.

[0058] Example 3

[0059] This embodiment is similar to Embodiment 1, except that in this embodiment:

[0060] like Figure 8 As shown, the quick-change cleaning roller 3 includes a roller shaft 31 mounted perpendicular to the conveying direction, and an industrial scouring pad 32 wrapped around the roller shaft 31.

[0061] In this embodiment, the roller 31 is a wooden sleeper.

[0062] like Figure 8 As shown, the roller 31 and the industrial scouring pad 32 are connected by Velcro 33.

[0063] After laser welding is completed, the welded plate is sent to the unloading process, where a set of quick-change cleaning rollers 3 are installed. The quick-change cleaning rollers 3 are made of wear-resistant materials such as polyurethane or nylon, such as industrial scouring pads 32. The surface is elastic and rough, which can effectively remove smoke, dust, debris and welding slag from the lower surface of the welded plate without scratching the appearance of the blank. The friction between the quick-change cleaning rollers 3 and the lower surface of the welded plate removes smoke, dust, debris and welding slag. The cleaning material is installed on the roller shaft 31 by Velcro 33 to achieve quick replacement.

[0064] The other structures and principles of this embodiment are the same as those of Embodiment 1.

[0065] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A device for cleaning the bottom surface of a laser-welded plate, characterized in that, It includes a discharge conveyor frame (1), an auxiliary pushing mechanism (2), a quick-change cleaning roller (3) and a quick-change brush roller (4) arranged sequentially along the conveying direction, a first positioning sensor located at the loading position of the discharge conveyor frame (1), a second positioning sensor located at the unloading position of the discharge conveyor frame (1), and a controller connected to the first positioning sensor and the second positioning sensor respectively. The controller is connected to the auxiliary pushing mechanism (2). The quick-change brush roller (4) includes a roller brush (41), and a face-changing end and a quick-insertion end respectively disposed at both ends of the quick-change brush roller (4). The axis of the roller brush (41) is perpendicular to the conveying direction. The face-changing end includes a first shaft (42) coaxially connected to the roller brush (41) at one end, and a hexagonal end (43) at the other end of the first shaft (42). It also includes an internal hexagonal connector (44) that mates with the hexagonal end (43). The internal hexagonal connector (44) is fixed on the discharge conveyor frame (1). The quick-connect end includes a second shaft (45) coaxially connected to the roller brush (41) at one end, and a spring pin (46) connected to the other end of the second shaft (45). It also includes an internal round hole connector (47) that mates with the spring pin (46). The internal round hole connector (47) is located on the discharge conveyor frame (1). The discharge conveyor frame (1) also has a quick-change auxiliary hole (13) that coaxially communicates with the internal round hole connector (47).

2. The laser-welded plate bottom surface cleaning device according to claim 1, characterized in that, The auxiliary pushing mechanism (2) includes a telescopic cylinder (21) and an auxiliary push rod (22) located at the output end of the telescopic cylinder (21). The axis of the auxiliary push rod (22) is perpendicular to the conveying direction.

3. The laser-welded plate bottom surface cleaning device according to claim 1, characterized in that, The discharge conveyor frame (1) includes a support frame (11) and a plurality of rollers (12) arranged on the support frame (11) along the conveying direction.

4. The laser-welded plate bottom surface cleaning device according to claim 1, characterized in that, The roller brush (41) and the first shaft (42) are connected by a concave fixing ring (48), and the concave fixing ring (48) is provided with a first locking bolt that passes through the concave fixing ring (48) and abuts against the first shaft (42); the roller brush (41) and the second shaft (45) are connected by a convex fixing ring (49), and the convex fixing ring (49) is provided with a second locking bolt that passes through the convex fixing ring (49) and abuts against the second shaft (45).

5. The laser-welded plate bottom surface cleaning device according to claim 4, characterized in that, The roller brush (41) is composed of several roller brush units (411). Each roller brush unit (411) has a concave key and a convex key at both ends. Two adjacent roller brush units (411) are connected by the concave key and the convex key. The concave key on one side of the roller brush (41) is engaged with the convex fixing ring (49), and the convex key on the other side of the roller brush (41) is engaged with the convex fixing ring (49).

6. The laser-welded plate bottom surface cleaning device according to claim 5, characterized in that, The end faces of the convex fixing ring (49) and the concave fixing ring (48) are also provided with anti-rotation keys (40), and the concave key and the convex key are provided with anti-rotation grooves (400) that cooperate with the anti-rotation keys (40).

7. The laser-welded plate bottom surface cleaning device according to claim 1, characterized in that, The quick-change cleaning roller (3) includes a roller shaft (31) erected perpendicular to the conveying direction, and an industrial scouring pad (32) wrapped around the roller shaft (31).

8. The laser-welded plate bottom surface cleaning device according to claim 7, characterized in that, The roller (31) and the industrial scouring pad (32) are connected by Velcro (33).

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