Coating device and method for producing moisture-proof antibacterial decorative paper by using same

Abstract

The invention relates to a coating device and a method for producing damp-proof antibacterial decorative paper through the device. The coating device comprises a rack, a hopper, a material taking roller, a supporting roller and a coating roller, a mounting plate is mounted on the rack in a lifting mode, the hopper is mounted on the mounting plate, and the rack is provided with a driving device, a reset device and a feeding pump; the driving device is used for driving the mounting plate to ascend and is in transmission connection with a driving source of the coating roller, the resetting device is used for resetting the hopper, and the feeding pump is used for supplementing paint to the hopper. Along with material taking of the material taking roller, the hopper ascends along with rotation of the coating roller, the lower side of the material taking roller is always kept at the required immersion depth, the paint utilization rate is increased, the amount of paint adhered to the side wall of the material taking roller is always kept within the specified thickness and specified amount, the coating effect of the coating roller on decorative paper is better, and the service life of the coating roller is prolonged. And meanwhile, after the amount of the coating in the hopper is reduced to a certain degree, the hopper is reset by the reset device, and the coating is supplemented into the hopper by the feeding pump, so that continuous coating work is realized.

Description

Technical Field

[0001] The present application relates to the field of decorative paper production equipment, and in particular to a coating device and a method for producing moisture-proof and antibacterial decorative paper using the device. Background Art

[0002] After applying a moisture-proof and antibacterial coating on the surface of the decorative paper, the decorative paper can have moisture-proof and antibacterial functions.

[0003] The moisture-proof and antibacterial coating is usually applied by a coating machine, which includes a frame on which are mounted a hopper for loading materials, a material taking roller for taking materials, a coating roller for coating, and a support roller for supporting the decorative paper.

[0004] The lower side of the take-up roller is located in the hopper and immersed in the coating. The decorative paper is tightly wound around the supporting roller. The coating roller is in close contact with the take-up roller and the decorative paper on the supporting roller. As the coating roller rotates, the coating roller applies the coating on the take-up roller to the decorative paper. The supporting roller rotates to transport the coated decorative paper to the drying area for drying.

[0005] During the coating process, the pick-up roller must keep at least one-third of it immersed in the coating to ensure that the pick-up roller can apply coating to the entire side wall of the coating roller. Therefore, when the coating in the hopper drops to a certain level, the coating in the hopper needs to be replenished.

[0006] In actual production, since a large amount of paint remains at the bottom of the hopper for a long time, and the paint at this position is basically not in contact with the feeding roller and is in a static state for a long time, precipitation and condensation are prone to occur at the bottom of the hopper, which reduces the volume of the hopper and affects the composition of the newly added paint, thereby affecting the final coating effect. Summary of the invention

[0007] In order to solve the problem that sedimentation is easy to occur inside the hopper of a traditional coating machine, thus interfering with the coating effect, the present application provides a coating device and a method for producing moisture-proof and antibacterial decorative paper using the device.

[0008] In the first aspect, the present application provides a coating device adopting the following technical solution: A coating device comprises a frame, a hopper, a feeding roller for taking material from the hopper, a support roller for tensioning and supporting a coating substrate, and a coating roller for cooperating with the feeding roller to coat the coating substrate. A horizontal mounting plate is mounted on the frame for lifting and lowering, and the hopper is mounted on the mounting plate. The frame is also provided with a driving device, a resetting device and a feeding pump. The driving device is used to drive the mounting plate to rise, and the driving device is connected to the driving source of the coating roller through a reduction mechanism. The resetting device is used to reset the position of the hopper, and the feeding pump is used to cooperate with the resetting device to replenish coating material to the reset hopper.

[0009] Through the above technical scheme, as the feeding roller takes material, the hopper rises as the coating roller rotates, so that the lower side of the feeding roller can always maintain the required immersion depth, thereby improving the utilization rate of the paint in the hopper. Moreover, since the immersion depth of the lower side of the feeding roller is always maintained at an appropriate depth, the amount of paint adhered to the side wall of the feeding roller is always maintained within the specified thickness and the specified amount. The coating effect of the coating roller on the decorative paper is more stable, and the stability of the quality of the decorative paper is improved. At the same time, when the amount of paint in the hopper is reduced to a certain extent, the reset device resets the hopper, and the feeding pump replenishes the paint in the hopper to achieve continuous coating work.

[0010] Optionally, the hopper is slidably mounted on the mounting plate, a slope is provided on the top wall of the mounting plate, a pushing mechanism is provided on the mounting plate for pushing the hopper to slide toward the slope, and the pushing mechanism is transmission-connected to the hopper.

[0011] Optionally, the driving device includes a first screw rod rotatably mounted on the frame and a light rod mounted on the frame, the light rod slides through the mounting plate, the first screw rod passes through the mounting plate and is threadedly engaged with the mounting plate, and the first screw rod is connected to the driving source of the coating roller via a reduction mechanism.

[0012] Optionally, the pushing mechanism includes a push rod slidably mounted on the mounting plate and a second screw rod rotatably mounted on the mounting plate, the push rod is rotatably connected to the hopper, the second screw rod penetrates into the push rod and cooperates with the push rod thread, and the second screw rod is transmission-connected to the first screw rod.

[0013] Optionally, the reset device includes a driven gear installed at the lower end of the first screw rod, a first driving gear and a second driving gear rotatably installed on the frame and meshing with the driven gear, a first transmission shaft is coaxially installed on the first driving gear, a second transmission shaft is coaxially installed on the second driving gear, a third transmission shaft and a fourth transmission shaft are rotatably installed on the frame, the first transmission shaft is coaxial with the third transmission shaft, the second transmission shaft is coaxial with the fourth transmission shaft, the third transmission shaft is transmission-connected to the driving source of the coating roller, and the fourth transmission shaft is transmission-connected to the reversing motor, and the reset device also includes a switching mechanism for switching the first transmission shaft and the third transmission shaft to be connected to each other or the second transmission shaft to be connected to the fourth transmission shaft.

[0014] Optionally, the switching mechanism includes a mounting sleeve installed on the first transmission shaft and the fourth transmission shaft, a plurality of arc-shaped clamping plates arranged on the mounting sleeve, and a limiting ring slidably installed on the mounting sleeve, the clamping plate is elastically connected to the mounting sleeve, the clamping plate is trumpet-shaped and diffused, and a friction layer is arranged on the inner wall, the limiting ring is used to push the clamping plate to close to clamp the third transmission shaft or the second transmission shaft, the two limiting rings are connected by a switching assembly, and when the limiting ring on the first transmission shaft clamps the clamping plate, the limiting ring on the fourth transmission shaft loosens the clamping plate.

[0015] Optionally, the switching assembly includes a cylinder, two mounting rings and a connecting rod, the cylinder is mounted on the frame, the connecting rod is connected to the cylinder, the two mounting rings are rotatably mounted on the two limit rings respectively, and both ends of the connecting rod are connected to the two mounting rings.

[0016] Optionally, a connecting shaft for transmitting and connecting the first screw rod and the second screw rod is rotatably installed on the mounting plate, and a third screw rod transmission-connected to the connecting shaft is also rotatably installed on the mounting plate, and a third driving gear is slidably installed on the connecting shaft, and the third driving gear is circumferentially fixed to the connecting shaft. Two push plates are also slidably installed on the connecting shaft, and the push plates are rotatably connected to both ends of the third driving gear, respectively, the third screw rod passes through the push plate and is threadedly matched with the push plate, and the connecting shaft and the second screw rod are transmission-connected via a gear set, and the third driving gear can slide to mesh with the gear set of the second screw rod.

[0017] Optionally, a start button and a stop button are provided on the mounting plate, and a feeding pump is provided on the frame, the start button is used to start the feeding pump, the cylinder and the reversing motor, and the stop button is used to stop the feeding pump, reset the cylinder and stop the reversing motor, the start button and the stop button are respectively located on both sides of the push plate, when the hopper moves to the limit position, the push plate presses against the start button, and when the hopper is reset, the push plate presses against the stop button.

[0018] In a second aspect, the present application provides a method for producing moisture-proof and antibacterial decorative paper, comprising the following steps: firstly preparing the coating according to the demand, then loading the coating into the storage barrel of the coating machine for storage, and at the same time, tensioning and winding the base of the decorative paper on the supporting roller of the coating machine, and then starting the coating machine for coating, and the above-mentioned coating machine adopts any coating device described in rights 1-9.

[0019] To summarize, the present application moves the hopper upward and flips it over during use, so that the lower side of the material taking roller can always maintain a sufficient immersion depth, thereby allowing the material taking amount of the material taking roller to remain in a stable state. At the same time, the rising height and sliding distance of the hopper are limited by the start button and the stop button, so that the hopper is not prone to excessive movement. Through the above-mentioned actions, the utilization rate of the paint in the hopper is improved, and the amount of paint sedimentation in the hopper is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional structural schematic diagram of the present application, in which the subsequent transmission and drying part is omitted, and the driving source of the reversing motor and the coating roller is not shown in the figure.

[0021] Figure 2 It is a three-dimensional structural schematic diagram of the present application, in which the protective shell at the second screw rod is removed and part of the frame is cut off. The reduction mechanism between the driving source of the coating roller and the first transmission shaft is not shown in the figure, and the transmission mechanism between the reversing motor and the second transmission shaft is not shown in the figure.

[0022] Figure 3 yes Figure 2 Enlarged schematic diagram of part A in the middle.

[0023] Figure 4 yes Figure 2 Enlarged schematic diagram of part B in the middle.

[0024] Figure 5 It is an exploded schematic diagram of the reset device of the present application.

[0025] Those skilled in the art will appreciate that the elements in the drawings are shown for simplicity and clarity and are not necessarily drawn to scale. For example, the size and position of some elements in the drawings may be exaggerated relative to other elements to help improve understanding of the embodiments of the present invention.

[0026] 1. The hopper includes a first screw rod, a second screw rod, a second drive gear, a third drive gear, a fourth drive shaft, a fifth drive shaft, a fifth drive shaft, and a fifth drive shaft. 2. The hopper includes a first screw rod, a second drive gear, a third drive gear, a third drive shaft, a fourth drive shaft, a fifth drive shaft, and a fifth drive shaft. 3. The hopper includes a first screw rod, a second drive gear, a third drive gear, a third drive gear, a third drive gear, a third drive shaft, a fourth drive shaft, a third ... DETAILED DESCRIPTION

[0027] The following is combined with Figure 1 —5 further describes this application in detail.

[0028] In the first aspect, the present application embodiment discloses a coating device, referring to Figure 1 , including a frame 1, a material taking roller 12 rotatably mounted on the frame 1, a support roller 13, a coating roller 14, a hopper 11, a mounting plate 16, a driving device 2 for driving the mounting plate to rise, and a resetting device for resetting the hopper.

[0029] Reference Figure 1 and Figure 2 The mounting plate 16 is horizontally arranged on the frame 1, the driving device 2 includes three light rods 22 and a first screw rod 21, the three light rods 22 are fixedly mounted on the frame 1 and are vertical, the first screw rod 21 is rotatably mounted on the frame 1, the three light rods 22 are slidably passed through the mounting plate 16 so that the mounting plate 16 is slidably mounted on the frame 1, the first screw rod 21 passes through the mounting plate 16 and is threadedly matched with the mounting plate 16 to drive the mounting plate 16, and the hopper 11 is slidably mounted on the mounting plate 16.

[0030] Reference Figure 1 and Figure 2 The lower side of the feeding roller 12 is located in the hopper 11 and immersed in the coating in the hopper 11, the coating roller 14 is pressed against the feeding roller 12, the decorative paper is pressed against the supporting roller 13, and the coating roller 14 is pressed against the decorative paper on the supporting roller 13 to coat the decorative paper.

[0031] Reference Figure 1 and Figure 2 A slope 23 is provided on the top wall of the mounting plate 16 in the sliding direction of the hopper 11. As the hopper 11 slides, the slope 23 pushes the hopper 11 to flip, and the bottom corner of the hopper 11 away from the slope 23 is set in an arc shape. A pushing mechanism 4 is provided on the mounting plate 16 to drive the hopper 11.

[0032] Reference Figure 1 and Figure 2 The frame 1 is also provided with a reset device 3 and a feeding pump 15. The feeding pump 15 is fixedly mounted on the frame 1. The feeding pump 15 replenishes the paint in the hopper 11 through a pipeline. The reset device 3 is used to reset the hopper 11 when the feeding pump 15 is feeding.

[0033] Reference Figure 2 and Figure 3 The pushing mechanism 4 includes two push rods 41, a second screw rod 42 and a third screw rod 8 rotatably mounted on the mounting plate 16, and a connecting shaft 7. The push rod 41 is horizontally slidably mounted on the mounting plate 16, and one end of the push rod 41 is rotatably connected to the side wall of the hopper 11, and the hopper 11 is driven to slide by the sliding of the push rod 41.

[0034] Reference Figure 2 and Figure 3 The second screw rod 42 passes through one of the push rods 41 and is threadedly matched with the push rod 41. The push rod 41 is driven to slide by the rotation of the second screw rod 42, and the connecting shaft 7 is also rotatably installed on the mounting plate 16. One end of the connecting shaft 7 is transmission-connected to the first screw rod 21 through a bevel gear.

[0035] Reference Figure 2 and Figure 3 A third driving gear 71 is coaxially slidably installed on the connecting shaft 7, and two push plates 72 are also slidably installed on the connecting shaft 7. The push plates 72 are coaxially rotatably connected to the two ends of the third driving gear 71 respectively. The third screw rod 8 is parallel to the second screw rod 42. The third screw rod 8 passes through the push plate 72 and is threadedly matched with the push plate 72. The third screw rod 8 is transmission connected to the connecting shaft 7 through gears.

[0036] Reference Figure 2 and Figure 3The third driving gear 71 and one end of the second screw rod 42 can be connected by a gear set transmission. In the initial state, the third driving gear 71 is separated from the gear set of the second screw rod 42. Because when the paint in the hopper 11 is full, it is only necessary to raise the hopper 11 to meet the immersion depth requirement of the material taking roller 12. As the paint in the hopper 11 decreases, it is necessary to flip the hopper 11 to increase the depth of the paint in the hopper 11. At this time, the third driving gear 71 slides to engage with the gear set on the second screw rod 42. At this time, the second screw rod 42 rotates to drive the push rod 41 and the hopper 11 to slide, and then cooperate with the slope 23 to flip the hopper 11. At the same time, according to the shape of the hopper 11, the inclinations of various parts of the slope 23 are designed differently to adapt to the flipping of the hopper 11.

[0037] Reference Figure 2 and Figure 4 The reset device 3 includes a driven gear 31 coaxially fixedly mounted at the lower end of the first screw rod 21, a first drive gear 32 and a second drive gear 33 rotatably mounted on the frame 1, and a reversing motor fixedly mounted on the frame. The first drive gear 32 and the second drive gear 33 are both meshed with the driven gear 31, and a first transmission shaft 34 and a second transmission shaft 35 are coaxially fixedly mounted on the first drive gear 32 and the second drive gear 33, respectively. A third transmission shaft 36 and a fourth transmission shaft 37 are rotatably mounted on the frame 1 below the first transmission shaft 34, and the third transmission shaft 36 is coaxial with the first transmission shaft 34, and the fourth transmission shaft 37 is coaxial with the second transmission shaft 35.

[0038] Reference Figure 4 and Figure 5 , wherein the third transmission shaft 36 and the driving motor of the coating roller 14 are connected with a large transmission ratio through a combination of a worm gear, a bevel gear and a reduction gear set, and the fourth transmission shaft 37 and the reversing motor are connected with a gear set, and the reset device 3 also includes a switching mechanism 5, which includes two mounting sleeves 51 coaxially fixedly mounted on the first transmission shaft 34 and the third transmission shaft 36 respectively, and a limit ring 54 slidably mounted on the mounting sleeve 51. Two arc-shaped clamping plates 52 are fixedly mounted on the mounting sleeve 51, and the clamping plates 52 are made of elastic material, and the two clamping plates 52 are arranged in a trumpet shape, and the inner walls of the two clamping plates 52 are fixedly paved with a friction layer 53.

[0039] Reference Figure 4 and Figure 5The two limiting rings 54 are connected by a switching assembly 6, which includes two mounting rings 62 and a cylinder 61 fixedly mounted on the frame 1. The mounting rings 62 are rotatably mounted on the two limiting rings 54. The two mounting rings 62 are fixedly connected by a connecting rod 63. The piston rod of the cylinder 61 is fixedly connected to the connecting rod 63. When the piston rod of the cylinder 61 contracts, the limiting ring 54 on the first transmission shaft 34 slides onto the clamping plate 52 to push the clamping plate 52 to clamp the third transmission shaft 36. When the piston rod of the cylinder 61 extends, the limiting ring 54 on the fourth transmission shaft 37 pushes the clamping plate 52 to clamp the second transmission shaft 35. At this time, the limiting ring 54 on the first transmission shaft 34 is separated from the clamping plate 52, and the clamping plate 52 on the first transmission shaft 34 is opened, and the connection between the first transmission shaft 34 and the third transmission shaft 36 is disconnected.

[0040] Reference Figure 4 and Figure 5 Since the mounting ring 62 and the limiting ring 54 are rotationally connected, the limiting ring 54 can rotate with the rotation of the mounting sleeve 51. The limiting ring 54 is not easy to produce friction cutting on the clamping plate 52, and the clamping plate 52 is not easy to be damaged. The reaction force of the limiting ring 54 on the clamping plate 52 is small, so that relative rotation is not easy to occur between the clamping plate 52 and the third transmission shaft 36 or the second transmission shaft 35, and the synchronization rate between the first transmission shaft 34 and the third transmission shaft 36 and the second transmission shaft 35 and the fourth transmission shaft 37 is higher.

[0041] Reference Figure 4 and Figure 5 A start button 9 and a stop button 10 are fixedly mounted on the mounting plate 16 . The start button 9 is used to start the feeding pump 15 , the cylinder 61 and the reversing motor, and the stop button 10 is used to stop the feeding pump 15 , the reversing motor and the resetting cylinder 61 .

[0042] The start button 9 is located on the side of the forward direction of the third driving gear 71. When the hopper 11 slides and flips to the limit position, the push plate 72 on the forward direction of the third driving gear 71 presses the start button 9. The stop button 10 is located on the side of the initial position of the third driving gear 71. When the hopper 11 is reset, the other push plate 72 presses the stop button 10.

[0043] The implementation principle of the embodiment of this application is as follows: After the coating machine is started normally, as the material taking roller 12 is used, the paint inside the hopper 11 is reduced, and the mounting plate 16 rises with the rotation of the coating roller 14, thereby driving the hopper 11 to rise. When the hopper 11 rises to the limit, the third driving gear 71 meshes with the gear set on the second screw 42 to drive the second screw 42 to rotate, and the rotation of the second screw 42 drives the push rod 41 and the hopper 11 to slide, and then pushes the hopper 11 to rotate through the ramp 23. When the hopper 11 slides and flips until the paint in the hopper 11 is used to the limit, the push plate 72 presses the start button 9, and the cylinder 61 starts to push the two limit rings 54 to move and switch, and the limit ring 54 on the first transmission shaft 34 is separated from the clamping plate 52, and the transmission between the first transmission shaft 34 and the third transmission shaft 36 is disconnected. The limit ring 54 on the fourth transmission shaft 37 pushes the clamping plate 52 to clamp and fix the second transmission shaft 35, and the second transmission shaft 35 is connected with the fourth transmission shaft 37 in transmission. At the same time, the start button 9 starts the feeding pump 15 and the reversing motor synchronously, and the feeding pump 15 starts to inject the paint into the hopper 11.

[0044] At the same time, the reversing motor starts to drive the second transmission shaft 35 to rotate, and the rotation of the second transmission shaft 35 drives the first screw rod 21, the second screw rod 42 and the third screw rod 8 to rotate in the opposite direction to reset the hopper 11, the mounting plate 16 and the third driving gear 71. When the resetting is completed, the paint in the hopper 11 is added. At this time, the push plate 72 is pressed against the stop button 10 to press the stop button 10, the cylinder 61 is retracted, the limit ring 54 on the first transmission shaft 34 pushes the clamping plate 52 to clamp the third transmission shaft 36, and the limit ring 54 on the fourth transmission shaft 37 releases the clamping plate 52. The first transmission shaft 34 and the third transmission shaft 36 are coaxially fixedly connected, the second transmission shaft 35 and the fourth transmission shaft 37 are separated, and the reversing motor and the feeding pump 15 are both stopped, realizing seamless feeding and state switching of the hopper 11 under the working state of the feeding roller 12. At the same time, the start button 9 and the stop button 10 also prevent the excessive flipping of the hopper 11 and the excessive rise of the mounting plate 16 from causing the hopper 11 to crush the feeding roller 12.

[0045] On the second aspect, an embodiment of the present application provides a method for producing moisture-proof and antibacterial decorative paper, comprising the following steps: first, prepare the paint according to demand, then load the paint into the storage barrel of the coating machine for storage, and at the same time, tighten the base of the decorative paper and wrap it around the support roller 13 of the coating machine, and then start the coating machine for coating, the coating machine is the above-mentioned coating device.

[0046] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A coating device, comprising a frame (1), a hopper (11), a feeding roller (12) for taking material from the hopper (11), a supporting roller (13) for tensioning and supporting a coating substrate, and a coating roller (14) for cooperating with the feeding roller (12) to coat the coating substrate, characterized in that: A horizontal mounting plate (16) is mounted on the frame (1) for lifting, and the hopper (11) is mounted on the mounting plate (16). The frame (1) is also provided with a driving device (2), a resetting device (3) and a feeding pump (15). The driving device (2) is used to drive the mounting plate (16) to rise, and the driving device (2) is connected to the driving source of the coating roller (14) through a reduction mechanism. The resetting device (3) is used to reset the position of the hopper (11), and the feeding pump (15) is used to cooperate with the resetting device (3) to replenish paint to the hopper (11) after the hopper (11) is reset.

2. A coating device according to claim 1, characterized in that: The hopper (11) is slidably mounted on the mounting plate (16), a slope (23) is provided on the top wall of the mounting plate (16), a pushing mechanism (4) is provided on the mounting plate (16) for pushing the hopper (11) to slide towards the slope (23), and the pushing mechanism (4) is transmission-connected to the hopper (11).

3. A coating device according to claim 2, characterized in that: The driving device (2) comprises a first screw rod (21) rotatably mounted on the frame (1) and a light rod (22) mounted on the frame (1); the light rod (22) slides through the mounting plate (16); the first screw rod (21) passes through the mounting plate (16) and is threadedly engaged with the mounting plate (16); the first screw rod (21) is connected to a driving source of the coating roller (14) via a speed reduction mechanism.

4. A coating device according to claim 3, characterized in that: The pushing mechanism (4) comprises a push rod (41) slidably mounted on the mounting plate (16) and a second screw rod (42) rotatably mounted on the mounting plate (16); the push rod (41) is rotatably connected to the hopper (11); the second screw rod (42) penetrates into the push rod (41) and is threadably engaged with the push rod (41); the second screw rod (42) is transmission-connected to the first screw rod (21).

5. A coating device according to claim 3, characterized in that: The reset device (3) comprises a driven gear (31) mounted at the lower end of the first screw rod (21), a first drive gear (32) and a second drive gear (33) rotatably mounted on the frame (1) and meshing with the driven gear (31), and a reversing motor mounted on the frame, wherein a first transmission shaft (34) is coaxially mounted on the first drive gear (32), a second transmission shaft (35) is coaxially mounted on the second drive gear (33), and a third transmission shaft (36) and a fourth transmission shaft (37) are rotatably mounted on the frame (1). The first transmission shaft (34) is coaxial with the third transmission shaft (36), the second transmission shaft (35) is coaxial with the fourth transmission shaft (37), the third transmission shaft (36) is transmission-connected to the driving source of the coating roller (14), and the fourth transmission shaft (37) is transmission-connected to the reversing motor. The reset device (3) further comprises a switching mechanism (5) for switching the first transmission shaft (34) and the third transmission shaft (36) to be connected to each other or the second transmission shaft (35) and the fourth transmission shaft (37) to be connected.

6. A coating device according to claim 5, characterized in that: The switching mechanism (5) comprises a mounting sleeve (51) mounted on the first transmission shaft (34) and the fourth transmission shaft (37), a plurality of arc-shaped clamping plates (52) arranged on the mounting sleeve (51), and a limiting ring (54) slidably mounted on the mounting sleeve (51); the clamping plates (52) are elastically connected to the mounting sleeve (51); the clamping plates (52) are diffused in a trumpet shape and a friction layer (53) is arranged on the inner wall; the limiting ring (54) is used to push the clamping plates (52) to close and hold the third transmission shaft (36) or the second transmission shaft (35); the two limiting rings (54) are connected via a switching assembly (6); and when the limiting ring (54) on the first transmission shaft (34) holds the clamping plates (52), the limiting ring (54) on the fourth transmission shaft (37) releases the clamping plates (52).

7. A coating device according to claim 6, characterized in that: The switching assembly (6) comprises a cylinder (61), two mounting rings (62) and a connecting rod (63); the cylinder (61) is mounted on the frame (1); the connecting rod (63) is connected to the cylinder (61); the two mounting rings (62) are rotatably mounted on the two limit rings (54) respectively; and the two ends of the connecting rod (63) are connected to the two mounting rings (62).

8. A coating device according to claim 4, characterized in that: A connecting shaft (7) for transmission connection between the first screw rod (21) and the second screw rod (42) is rotatably mounted on the mounting plate (16); a third screw rod (8) transmission-connected to the connecting shaft (7) is also rotatably mounted on the mounting plate (16); a third driving gear (71) is slidably mounted on the connecting shaft (7); the third driving gear (71) and the connecting shaft (7) are circumferentially fixed; two push plates (72) are also slidably mounted on the connecting shaft (7); the push plates (72) are rotationally connected to the two ends of the third driving gear (71), respectively; the third screw rod (8) passes through the push plates (72) and is threadedly engaged with the push plates (72); the connecting shaft (7) and the second screw rod (42) are transmission-connected via a gear set; the third driving gear (71) can slide to mesh with the gear set of the second screw rod (42).

9. A coating device according to claim 1, characterized in that: A start button (9) and a stop button (10) are provided on the mounting plate (16); a feeding pump (15) is provided on the frame (1); the start button (9) is used to start the feeding pump (15), the cylinder (61) and the reversing motor; the stop button (10) is used to stop the feeding pump (15), reset the cylinder (61) and stop the reversing motor; the start button (9) and the stop button (10) are respectively located on both sides of the push plate (72); when the hopper (11) moves to a limit position, the push plate (72) abuts against the start button (9); when the hopper (11) is reset, the push plate (72) abuts against the stop button (10).

10. A method for producing moisture-proof and antibacterial decorative paper, comprising the following steps: First, the coating is prepared according to the demand, and then the coating is loaded into the storage barrel of the coating machine for storage. At the same time, the base of the decorative paper is stretched and wound on the supporting roller (13) (13) of the coating machine, and then the coating machine is started for coating, and the above-mentioned coating machine adopts any coating device described in rights 1-9.

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