A painting device based on laser scanning

Abstract

The present application relates to the technical field of coating device, specifically relates to a kind of coating device based on laser scanning, comprising: conveying line is used to convey workpiece along X-axis direction;Laser head is used to scan workpiece, and the outer contour of workpiece is obtained;Spray head is used to spray coating to workpiece surface;The lens of laser head is located in the shield;Sealing plate can slide relative to mounting base between first position and second position along X-axis direction;The spray head is driven by a driving element and can be moved in the mounting base;Linkage mechanism is provided between the spray head and the sealing plate, when the spray head is in the working position, the sealing plate is driven into the first position by the linkage mechanism, and the spray head is moved to the non-working position;Sealing plate and spray head are linked, so that sealing plate can work cooperatively with spray head, so that sealing plate can change with the state change of spray head, so that only one driving element is used as power source to drive spray head to move, and additional power source is not needed to drive sealing plate to move, saving power source.

Description

Technical Field

[0001] This invention relates to the field of coating equipment technology, and more specifically to a coating equipment based on laser scanning. Background Technology

[0002] In related technologies, when coating some sheet-like workpieces, laser scanning technology is usually used to speed up the process. This mainly involves using a laser head to emit a laser to scan the outline of the workpiece, thereby providing the scanning range and spraying path for subsequent spraying.

[0003] However, in related technologies, the laser head is generally exposed in the painting workshop, where paint dust will be filled with paint dust due to the spraying operation. This paint dust can easily adhere to the laser head, especially the lens of the laser head, thus affecting the operation of the laser head, and therefore needs to be improved. Summary of the Invention

[0004] In order to solve at least one of the technical problems mentioned in the background art, the present invention aims to provide a coating device based on laser scanning.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A laser scanning-based coating apparatus includes: A conveyor line used to transport workpieces along the X-axis direction; The laser head is used to emit a laser along the Z-axis towards the workpiece to scan the workpiece and obtain its outer contour. Spray nozzles are used to spray paint onto the surface of workpieces. Mounting base, on which the laser head and nozzle are mounted; The three-axis displacement module is used to drive the mounting base to move along the X-axis, Y-axis and Z-axis directions; The device further includes: The protective cover has a closed structure with an opening at the bottom, and at least the lens of the laser head is located inside the protective cover; A sealing plate is movably disposed at the bottom of the protective cover and can slide relative to the mounting base in a first position and a second position along the X-axis; the sealing plate has a first through hole; the mounting base has a second through hole located on the axis of the laser head; in the first position, the first through hole and the second through hole are completely offset; in the second position, the first through hole and the second through hole coincide. The nozzle is driven by a drive component and can move on the mounting base; a linkage mechanism is provided between the nozzle and the sealing plate. When the nozzle is in the working position, the linkage mechanism drives the sealing plate into the first position, and the nozzle moves to the non-working position. In the non-working position, the nozzle is higher than the bottom wall of the mounting base.

[0006] Compared with existing technologies, the advantages of this solution are: This solution protects the laser head, especially its lens, by installing a protective cover. This prevents paint dust from adhering to the laser head lens during coating operations and affecting its operation. Specifically: Before the spray head sprays, the laser head first needs to scan the contour of the workpiece to obtain the boundary range of the workpiece, thereby forming the spraying path for the subsequent spray head spraying. Before scanning, the drive component first drives the spray head to the non-working position. At this time, under the action of the linkage component, the sealing plate will be driven to the second position. At this time, the first through hole and the second through hole coincide directly below the laser head to serve as the channel for the laser to pass through. The laser head scans the workpiece through this channel.

[0007] The reason for moving the nozzle to a non-working position during scanning is that, generally speaking, the smaller the distance between the laser head and the workpiece during scanning, the better the laser head can scan. Based on this, if the nozzle is not moved to the working position, the lower end of the nozzle will extend downwards beyond the bottom of the mounting base. Due to this limited distance, the bottom of the mounting base cannot continue to move downwards closer to the workpiece. Therefore, by setting the nozzle to enter the non-working position during scanning, the nozzle will not protrude downwards from the bottom wall of the mounting base, allowing the mounting base to descend further, which is more conducive to the laser head approaching the workpiece.

[0008] Furthermore, flipping the nozzle to a non-working position during scanning has the advantage that if the nozzle is accidentally turned on during scanning, it will not spray paint directly onto the workpiece, but will spray it to one side.

[0009] When the printhead needs to be sprayed after scanning, the drive unit drives the printhead to enter the working position (i.e., the position where the printhead faces the workpiece for spraying). At this time, the linkage component can drive the sealing plate to the first position, so that the sealing plate blocks the lower opening of the protective cover, making the protective cover basically completely closed. In this way, when the printhead is spraying, paint dust cannot enter the protective cover and contaminate the laser head lens.

[0010] As can be seen, in this solution, the sealing plate and the nozzle are linked, so the sealing plate can work together with the nozzle and change with the state of the nozzle. Thus, only one drive unit is needed as a power source to drive the nozzle, and there is no need to set up an additional power source to drive the sealing plate, saving power.

[0011] Preferably, the nozzle rotates about a pivot extending along the X-axis to move between a working position and a non-working position; the pivot is rotatably mounted on a mounting base.

[0012] Preferably, the linkage mechanism includes a lever, a protrusion, a transmission assembly, and an elastic element; the lever is linked to the rotating shaft through the transmission assembly, and when the rotating shaft rotates, the transmission assembly drives the lever to move along the Y-axis; the protrusion is provided on the sealing plate, and the lever includes at least a horizontal inclined section, which is used to push the protrusion to make the sealing plate move to a first position; the elastic element is used to provide elastic force to make the sealing plate tend to move to a second position.

[0013] Preferably, the transmission assembly includes a rack and a gear, the lever is fixed to the rack, the rack is movable relative to the mounting base along the Y-axis, and the gear is fixed to the rotating shaft and meshes with the rack.

[0014] Preferably, the transmission assembly further includes a guide rail extending along the Y-axis and fixed on the mounting base, with the rack slidably disposed on the guide rail.

[0015] Preferably, the protrusion includes a guide wheel rotatably mounted on the sealing plate.

[0016] Preferably, the elastic element includes a spring.

[0017] Preferably, the elastic element further includes a guide rod and a stop block. The guide rod extends along the Y-axis and one end is fixed to the sealing plate. The stop block is located at the other end of the guide rod. The spring is sleeved on the guide rod, and one end of the spring abuts against or is fixed to the mounting base. The other end of the spring abuts against or is fixed to the stop block.

[0018] Preferably, a bracket is fixedly connected to the rotating shaft, and the nozzle is fixed on the bracket and rotates synchronously with the bracket.

[0019] Preferably, the driving component is a motor, which drives the shaft to rotate.

[0020] Other advantages and effects of the present invention are explained in detail in the specific embodiments and accompanying drawings. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a partial structural diagram of the mounting base when the sealing plate of the present invention is in the first position; Figure 3 This is a partial structural diagram of the mounting base when the sealing plate of the present invention is in the second position; Figure 4 This is a cross-sectional view of the mounting base when the sealing plate of the present invention is in the first position; Figure 5 This is a cross-sectional view of the mounting base when the sealing plate of the present invention is in the second position; Figure 6 This is a schematic diagram of the sealing plate of the present invention. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be explained and described below with reference to the accompanying drawings. However, the following embodiments are only preferred embodiments of the present invention and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of the present invention.

[0023] In the following description, terms such as “inner,” “outer,” “upper,” “lower,” “left,” and “right” that indicate orientation or positional relationship are used only for the convenience of describing the embodiments and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0024] Example 1 Please see Figure 1-6 As shown, this embodiment provides a laser scanning-based coating device, mainly used for spray coating processing of flat sheet metal workpieces. This device mainly includes a conveyor line 1, a laser head 2, a spray nozzle 3, a mounting base 4, a three-axis displacement module, a protective cover 6, and a sealing plate 7. The following provides a detailed description of each component. For ease of description, as shown... Figure 1 As shown in the three-axis coordinate system, the X-axis direction, Y-axis direction, and Z-axis direction are defined.

[0025] Conveyor line 1 is used to transport workpieces along the X-axis direction; wherein, conveyor line 1 can be a roller line, or of course a conveyor belt, without specific limitation.

[0026] The laser head 2 is used to emit a laser beam towards the workpiece along the Z-axis to scan the workpiece. Preferably, the laser head 2 emits the laser beam vertically downwards to obtain the outer contour of the workpiece, thereby forming the boundary range of the workpiece and generating a spraying path for the subsequent spraying operation of the spray head 3. The laser head 2 is mounted on the mounting base 4.

[0027] The nozzle 3 is used to spray paint onto the surface of the workpiece. It is rotatably mounted on the mounting base 4 about a pivot 32 that extends along the Y-axis and is rotatably mounted on the mounting base 4.

[0028] like Figure 1 As shown, the three-axis displacement module is used to drive the mounting base 4 to move along the X-axis, Y-axis and Z-axis directions; preferably, in this embodiment, the three-axis displacement module can be three sets of lead screw linear modules. As a traditional actuator, the lead screw linear module mainly consists of a slide rail, a lead screw, a slide block and a motor. When working, the motor drives the lead screw to rotate, and the lead screw drives the slide block to slide linearly along the slide rail.

[0029] To facilitate understanding, the three linear modules in this embodiment are distinguished as follows: the three linear modules are the first lead screw linear module, the second lead screw linear module, and the third lead screw linear module.

[0030] The first lead screw linear module is used to drive the second lead screw linear module to move along the X-axis. Preferably, the first lead screw linear module is arranged in two parallel sets, located on both sides of the conveyor line 1.

[0031] The second lead screw linear module is used to drive the entire third lead screw linear module to move along the Y-axis; the third lead screw linear module is used to drive the mounting base 4 to move vertically (i.e., along the Z-axis); the specific installation is as follows: like Figure 1 As shown, the first linear screw module includes a first slide rail a1 and a first slide block a2; the second linear screw module includes a second slide rail b1 and a second slide block b2; and the third linear screw module includes a third slide rail c1 and a third slide block c2. The first slide rail a1 extends along the X-axis, the second slide rail b1 extends along the Y-axis and is fixed to the first slide block a2; the third slide rail c1 extends along the Z-axis and is fixed to the second slide block b2; the mounting base 4 is fixed to the third slide block c2. Thus, the mounting base 4 is driven to move along the X / Y / Z axes by three lead screw linear modules.

[0032] like Figure 4 As shown, the protective cover 6 has a closed structure with an opening at the bottom. For example, in this embodiment, the protective cover 6 is a cylindrical or polygonal cylindrical shape with an opening at the bottom. The protective cover 6 is fixedly upside down (i.e., the opening is facing down) on the top surface of the mounting base 4. The laser head 2 is fixed on the protective cover 6, and at least the lens of the laser head 2 is located inside the protective cover 6.

[0033] The sealing plate 7 is movably located at the bottom of the protective cover 6, preferably the sealing plate 7 can slide against the lower end of the protective cover 6.

[0034] The sealing plate 7 can slide relative to the mounting base 4 between a first position and a second position along the X-axis direction; specifically, a sliding groove 41 extending along the X-axis direction is provided on the upper wall of the sliding base; the sealing plate 7 is adapted to and slidably fitted within the sliding groove 41.

[0035] like Figure 6 As shown, the sealing plate 7 has a first through hole 71 that penetrates vertically through the sealing plate 7; as Figure 4 and Figure 5 As shown, the mounting base 4 has a second through hole 42 located on the axis of the laser head 2. In this embodiment, the second through hole 42 is located at the bottom of the slide groove 41 and vertically penetrates the mounting base 4, and is axially aligned with the laser head 2.

[0036] When the sealing plate 7 is in the first position, such as Figure 2 and Figure 4 As shown, the first through hole 71 and the second through hole 42 on the sealing plate 7 are completely offset. At this time, the plate surface of the sealing plate 7 blocks the bottom opening of the protective cover 6, cutting off the connection between the second through hole 42 and the bottom opening of the protective cover 6. In this way, the paint dust in the work area cannot enter the protective cover 6 through the second through hole 42 and contaminate the laser head 2.

[0037] In the second position, such as Figure 3 and Figure 5 As shown, the first through hole 71 and the second through hole 42 overlap, preferably they are coaxially aligned. In this case, the first through hole 71 and the second through hole 42 together form a vertical channel aligned with the axis of the laser head 2. Thus, during scanning, the laser emitted by the laser head 2 can be vertically irradiated downwards through this channel onto the workpiece on the conveyor line 1 to scan the workpiece.

[0038] The nozzle 3 is driven to move on the mounting base 4 by a driving component, and specifically the nozzle 3 is driven by the driving component to rotate between the working position and the non-working position on the mounting base 4.

[0039] When the nozzle 3 is in the working position, it is preferable that the spray direction of the nozzle 3 is vertically downward. When it is not in the working position, the nozzle 3 is above the bottom wall of the mounting base 4. For example, in this embodiment, the nozzle 3 is rotated outward by more than 90° to rotate to the upper part of the mounting base 4.

[0040] A linkage mechanism is provided between the nozzle 3 and the sealing plate 7. The linkage mechanism operates as follows: when the nozzle 3 is in the working position, the linkage mechanism drives the sealing plate 7 to the first position, and then the nozzle 3 moves to the non-working position.

[0041] In this solution, by setting up a protective cover 6, the laser head 2, especially the lens of the laser head 2, can be protected, so that during the coating process, paint dust is less likely to adhere to the lens of the laser head 2 and affect the operation of the laser head 2, especially: Before the spray nozzle 3 sprays, the laser head 2 first needs to scan the contour of the workpiece to obtain the boundary range of the workpiece, thereby forming a spraying path for the subsequent spraying by the spray nozzle 3. Before scanning, the drive component first drives the spray nozzle 3 into a non-working position. At this time, under the action of the linkage component, the sealing plate 7 will be driven into the second position. At this time, the first through hole 71 and the second through hole 42 coincide directly below the laser head 2 to serve as the channel for the laser to pass through. The laser head 2 scans the workpiece through this channel.

[0042] The reason for moving the nozzle 3 to a non-working position during scanning is that, generally speaking, the smaller the distance between the laser head 2 and the workpiece during scanning, the more favorable it is for the laser head 2 to scan. Based on this, if the nozzle 3 is not moved to the working position, the lower end of the nozzle 3 will extend downwards beyond the bottom of the mounting base 4 by a certain distance. Due to this limited distance, the bottom of the mounting base 4 cannot continue to move downwards closer to the workpiece. Therefore, the nozzle 3 is set to enter the non-working position during scanning. At this time, the nozzle 3 will not protrude downwards from the bottom wall of the mounting base 4, so that the mounting base 4 can descend lower, which is more conducive to the laser head 2 approaching the workpiece.

[0043] Moreover, flipping the nozzle 3 to a non-working position during scanning has the advantage that if the nozzle 3 is accidentally turned on during scanning, the nozzle 3 will not spray the paint directly onto the workpiece, but will spray it to one side.

[0044] When the printhead 3 needs to spray after the scanning is completed, the drive unit drives the printhead 3 to enter the working position (i.e., the position where the printhead 3 faces the workpiece for spraying). At this time, the linkage component can drive the sealing plate 7 to enter the first position, so that the sealing plate 7 blocks the lower opening of the protective cover 6, making the protective cover 6 basically completely closed. In this way, when the printhead 3 sprays, the paint dust cannot enter the protective cover 6 and contaminate the lens of the laser head 2.

[0045] As can be seen, in this solution, the sealing plate 7 and the nozzle 3 are linked together, so that the sealing plate 7 can work together with the nozzle 3, and the sealing plate 7 can change with the state of the nozzle 3. Thus, only one driving component is needed as a power source to drive the nozzle 3 to move, and there is no need to set up an additional power source to drive the sealing plate 7 to move, thus saving power.

[0046] In this embodiment, the nozzle 3 rotates about a pivot 32 extending along the X-axis to move between a working position and a non-working position; the pivot 32 is rotatably mounted on the mounting base 4. Specifically: In this embodiment, the rotating shaft 32 is rotatably mounted on the top of the mounting base 4. A bracket 31 is fixedly connected to the rotating shaft 32. The bracket 31 is L-shaped, and the nozzle 3 is fixed on the bracket 31 and rotates synchronously with the bracket 31. Thus, the driving component drives the rotating shaft 32 to rotate, and the rotating shaft 32 drives the bracket 31 to rotate, thereby driving the nozzle 3 to rotate. The driving component is preferably a motor 5, whose main shaft is fixed to one end of the rotating shaft 32.

[0047] The specific structure of the linkage mechanism is as follows: The linkage mechanism includes a lever 81, a protrusion, a transmission assembly, and an elastic element; the lever 81 is linked to the rotating shaft 32 through the transmission assembly, and the linkage relationship is that when the rotating shaft 32 rotates, the transmission assembly drives the lever 81 to move along the Y-axis direction.

[0048] The protrusion is provided on the top wall of the sealing plate 7, and the lever 81 includes at least a horizontal inclined section 811. Specifically, in this embodiment, the inclined section 811 gradually moves outward away from the protective cover 6 on the side of the protrusion away from the protective cover 6. The inclined section 811 is used to push the protrusion to move the sealing plate 7 to a first position; the elastic element is used to provide elastic force to make the sealing plate 7 tend to move to a second position.

[0049] The transmission assembly includes a rack 831 and a gear 832. The lever 81 is fixed on the rack 831. The rack 831 is movable relative to the mounting base 4 along the Y-axis. The gear 832 is fixed on the rotating shaft 32 and meshes with the rack 831.

[0050] Thus, the process of the nozzle 3 moving from the working position to the non-working position is as follows: the rotating shaft 32 rotates counterclockwise, which in turn drives the gear 832 to rotate counterclockwise. As a result, the gear 832 drives the rack 831 to slide away from the cover 6 along the Y-axis. In this way, the inclined section 811 also moves away from the cover 6 along the Y-axis (this is called moving backward). Thus, the contact point between the protrusion and the inclined section 811 will also change. As the inclined section 811 moves backward, under the elastic force of the elastic element, the sealing plate 7 will move away from the cover 6 along the X-axis. Finally, the sealing plate 7 enters the second position.

[0051] Conversely, the process of the nozzle 3 moving from the non-working position to the working position is as follows: the rotating shaft 32 rotates clockwise, which in turn drives the gear 832 to rotate clockwise, thereby pushing the rack 831 forward (relative to the aforementioned backward movement), so that the inclined section 811 moves forward. In this way, the inclined section 811 will overcome the elastic force of the elastic element and push against the protrusion, causing the protrusion and the sealing plate 7 to move towards the side closer to the protective cover 6, and finally the sealing plate 7 enters the first position.

[0052] To guide the sliding of the rack 831, the transmission assembly further includes a guide rail 833 extending along the Y-axis and fixed to the mounting base 4. The rack 831 is slidably disposed on the guide rail 833, wherein the guide rail 833 may be a dovetail guide rail 833 or a T-shaped guide rail 833.

[0053] In addition, in order to reduce the friction between the protrusion and the inclined section 811, in this embodiment, the protrusion is designed as a guide wheel 82 rotatably mounted on the sealing plate 7. The guide wheel 82 can rotate horizontally, so when the inclined section 811 pushes against the guide wheel 82, the guide wheel 82 can rotate, thereby forming rolling friction to reduce the friction.

[0054] In this embodiment, the elastic element includes a spring 841, a guide rod 842, and a stop block 843. The guide rod 842 extends along the Y-axis and one end is fixed to the sealing plate 7. The stop block 843 is located at the other end of the guide rod 842. One end of the spring 841 abuts against or is fixed to the mounting base 4, and the other end of the spring 841 abuts against or is fixed to the stop block 843. The spring 841 generates an elastic thrust on the stop block 843 toward the side away from the protective cover 6.

[0055] Example 2 Sometimes, dust and other impurities may adhere to the surface of the workpiece, and the presence of these impurities will affect the subsequent spraying effect. Moreover, in the scheme of Embodiment 1, since the first through hole 71 and the second through hole 42 are connected during scanning, when there is a lot of paint dust in the spraying room, these floating dust particles may enter the protective cover 6 through the connected first through hole 71 and the second through hole 42 during the scanning process, which will also cause contamination to the laser head 2.

[0056] Therefore, in this embodiment, a further improvement is made based on Embodiment 1: This embodiment also includes a fan 9, the air outlet of which is connected to the interior of the protective cover 6. In this embodiment, the fan 9 is mainly turned on during scanning, and the fan 9 has two main functions: First, during the scanning process, the air blown into the protective cover 6 by the fan 9 will be blown downward through the channel formed by the connection of the first through hole 71 and the second through hole 42. At this time, the channel is equivalent to the air outlet. Thus, the air blown out of the air outlet will blow towards the surface of the workpiece during the scanning process to sweep away the dust and other impurities attached to the surface of the workpiece.

[0057] It is worth noting that, normally, the closer the air outlet formed by the connection of the first through hole 71 and the second through hole 42 is to the workpiece, the greater the air force blowing on the workpiece. Thanks to this embodiment, the nozzle 3 is in a non-working position during the scanning stage, so the nozzle 3 will not protrude from the bottom wall of the mounting base 4, thereby allowing the mounting base 4 to be closer to the workpiece surface, and thus the air outlet is also closer to the workpiece surface.

[0058] The reason why the channel formed by the first through hole 71 and the second through hole 42 is used as the air outlet is that the air blown out by the first through hole 71 and the second through hole 42 forms an airflow that blows downward, preventing dust from the external environment from entering and flowing back into the protective cover 6 through the first through hole 71 and the second through hole 42.

[0059] In order to ensure the cleanliness of the air blown into the protective cover 6 by the fan 9, in this embodiment, a filter, such as a dust filter, is provided at the air inlet of the fan 9 to prevent the fan 9 from bringing dust from the external environment into the protective cover 6.

[0060] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A coating apparatus based on laser scanning, comprising: A conveyor line used to transport workpieces along the X-axis direction; A laser head is used to emit a laser along the Z-axis toward the workpiece to scan the workpiece and obtain its outer contour. Spray nozzles are used to spray paint onto the surface of workpieces. Mounting base, on which the laser head and nozzle are mounted; The three-axis displacement module is used to drive the mounting base to move along the X-axis, Y-axis and Z-axis directions; The device is characterized in that it further includes: The protective cover has a closed structure with an opening at the bottom, and at least the lens of the laser head is located inside the protective cover; A sealing plate is movably disposed at the bottom of the protective cover and can slide relative to the mounting base in a first position and a second position along the X-axis; the sealing plate has a first through hole; the mounting base has a second through hole located on the axis of the laser head; in the first position, the first through hole and the second through hole are completely offset; in the second position, the first through hole and the second through hole coincide. The nozzle is driven by a driving component and can move on the mounting base; a linkage mechanism is provided between the nozzle and the sealing plate. When the nozzle is in the working position, the linkage mechanism drives the sealing plate into the first position, and the nozzle moves to the non-working position. In the non-working position, the nozzle is higher than the bottom wall of the mounting base. The nozzle rotates about a pivot extending along the X-axis to move between a working position and a non-working position; the pivot is rotatably mounted on a mounting base. The linkage mechanism includes a lever, a protrusion, a transmission assembly, and an elastic element; the lever is linked to the rotating shaft through the transmission assembly, and when the rotating shaft rotates, the transmission assembly drives the lever to move along the Y-axis; the protrusion is provided on the sealing plate, and the lever includes at least a horizontal inclined section, which is used to push the protrusion to make the sealing plate move to a first position; the elastic element is used to provide elastic force to make the sealing plate tend to move to a second position.

2. The coating apparatus based on laser scanning according to claim 1, characterized in that, The transmission assembly includes a rack and a gear. The lever is fixed to the rack, the rack is movable relative to the mounting base along the Y-axis, and the gear is fixed to the rotating shaft and meshes with the rack.

3. The coating apparatus based on laser scanning according to claim 2, characterized in that, The transmission assembly also includes a guide rail extending along the Y-axis and fixed on the mounting base, and the rack is slidably disposed on the guide rail.

4. The coating apparatus based on laser scanning according to claim 1, characterized in that, The protrusion includes a guide wheel rotatably mounted on the sealing plate.

5. A coating apparatus based on laser scanning according to claim 1, characterized in that, The elastic element includes a spring.

6. A coating apparatus based on laser scanning according to claim 5, characterized in that, The elastic element also includes a guide rod and a stop block. The guide rod extends along the Y-axis and one end is fixed to the sealing plate. The stop block is located at the other end of the guide rod. The spring is sleeved on the guide rod, and one end of the spring abuts or is fixed to the mounting base. The other end of the spring abuts or is fixed to the stop block.

7. A coating apparatus based on laser scanning according to claim 1, characterized in that, A bracket is fixedly connected to the rotating shaft, and the nozzle is fixed on the bracket and rotates synchronously with the bracket.

8. A coating apparatus based on laser scanning according to claim 1, characterized in that, The driving component is a motor, which drives the shaft to rotate.

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