Waterproof coating device for inner wall of paper tube

Abstract

The invention discloses a waterproof coating device for the inner wall of a paper tube, and relates to the technical field of paper tube processing. The paper tube comprises a paper tube body and a fixing cylinder, one side of the fixing cylinder is fixedly connected with a driving cylinder, and an inner cavity of the driving cylinder is connected with a first rotating cylinder through a bearing seat rotating shaft. The single driving motor is matched with transmission mechanisms such as a half gear, a synchronous belt, a bevel gear, a worm gear and a worm, continuous rotary spraying of a spraying pipe and intermittent advancing of the whole device are synchronously achieved, the spraying function and the trowelling function are integrated, the driving structure is simplified, meanwhile, the smearing roller assembly driven by a cam mechanism is arranged, and the spraying efficiency is improved. The continuous rotating cam is used for periodically pushing the coating roller to press the inner wall of the paper tube, and the rotating coating roller is used for rolling and smoothing the coating while the inner wall is sprayed, so that the coating is more uniformly distributed, the problems of sagging, material accumulation, coating dead angles and the like are effectively avoided, and the quality and waterproof effect of an inner wall coating are improved.

Description

Technical Field

[0001] This invention belongs to the field of paper tube processing technology, and in particular relates to a waterproof coating device for the inner wall of a paper tube. Background Technology

[0002] Paper tubes, as a common industrial winding substrate, are widely used in textiles, packaging, construction, and other fields. In some applications, paper tubes need to have good moisture and water resistance to prevent the contents from becoming damp and deteriorating or the paper tube itself from being damaged. Therefore, applying a waterproof coating to the inner wall of the paper tube is an important processing step.

[0003] Currently, the methods for waterproofing the inner wall of paper tubes are mostly manual brushing or using simple spraying devices. Manual brushing is inefficient, results in poor coating uniformity, and makes it difficult to guarantee quality, while also requiring a high level of operator skill. Existing simple spraying devices are often single-function, typically only capable of rotary spraying, lacking an effective coating homogenization mechanism. This leads to uneven coating distribution on the inner wall, easily causing drips and accumulation, thus affecting the waterproofing effect. Furthermore, the inner diameter of paper tubes varies significantly depending on their specifications, and existing equipment often lacks convenient adjustment mechanisms, making it difficult to adapt to the production needs of multiple paper tube sizes and limiting its application range.

[0004] To address these issues, we provide a waterproof coating device for the inner wall of paper tubes. Summary of the Invention

[0005] The purpose of this invention is to provide a waterproof coating device for the inner wall of paper tubes. By coordinating the coating mechanism and the adjustment mechanism, it solves the problems of uneven coating, low efficiency and poor adaptability in the existing waterproof coating devices for the inner wall of paper tubes.

[0006] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution.

[0007] This invention relates to a waterproof coating device for the inner wall of a paper tube, comprising a paper tube body and a fixed cylinder. A drive cylinder is fixedly connected to one side of the fixed cylinder. A first rotating cylinder is connected to the inner cavity of the drive cylinder via a bearing seat shaft. A spray pipe is fixedly connected to one end of the first rotating cylinder. A coating pipe is movably connected to the first rotating cylinder via a universal joint. A coating mechanism is provided on one side of the spray pipe. The coating mechanism includes a support cylinder fixedly connected to one side of the spray pipe, a double-sided drive block disposed in the inner cavity of the support cylinder, a support frame fixedly connected to one side of the double-sided drive block, and a coating roller fixedly connected to the other end of the support frame. An adjustment mechanism is provided in the inner cavity of the fixed cylinder. The adjustment mechanism includes a threaded rod rotatably connected to the inner cavity of the fixed cylinder via a bearing seat, a threaded tube sleeved on the surface of the threaded rod, and a mounting frame fixedly connected to one end of the threaded tube.

[0008] The invention is further configured such that a drive motor is fixedly connected to one side of the drive cylinder, a half gear is fixedly connected to the output shaft of the drive motor, and a synchronous belt is connected between the output shaft of the drive motor and the surface of the first rotating cylinder. The drive motor, through the combination of the half gear and the synchronous belt, ensures the continuous rotation of the first rotating cylinder (synchronous belt drive), and can also convert the continuous rotation into intermittent rotation through the intermittent meshing characteristics of the gear gap meshing of the half gear drive, thereby providing power for the intermittent movement of the device in the paper tube.

[0009] The present invention is further configured such that a second rotating cylinder is rotatably connected to the inner cavity of the drive cylinder through a bearing seat, and a transmission gear is fixedly connected to one end of the second rotating cylinder extending through the outer side of the drive cylinder. The spray nozzle is synchronously driven to rotate for spraying by a single drive motor, and the half gear is driven to provide power for intermittent movement, which simplifies the structure and reduces the cost.

[0010] The invention is further configured such that a first bevel gear is fixedly connected to the surface of the second rotating drum, a second bevel gear meshes with the surface of the first bevel gear, a transmission cylinder is fixedly connected to the shaft of the second bevel gear, a worm is slidably connected to the inner cavity of the transmission cylinder, a worm wheel meshes with the surface of the worm, a rotating shaft is fixedly connected to the shaft of the worm wheel, and a traveling wheel is fixedly connected to the surface of the rotating shaft. There are three mounting brackets and three sets of traveling wheels (two in each set), with the worm wheel located between each set of traveling wheels. The first and second bevel gears form a bevel gear pair. Through bevel gear reversal and worm gear transmission, the intermittent rotation of the second rotating drum is converted into intermittent rotation of the traveling wheels. The self-locking characteristic of the worm gear prevents the device from accidentally retracting during the spraying process, ensuring operational stability. Simultaneously, the three sets of traveling wheels are evenly distributed circumferentially, providing stable support.

[0011] The invention is further configured such that a locking block is fixedly connected to the surface of the worm gear, and a slot adapted to the locking block is opened on the inner side of the transmission cylinder. The worm gear in the transmission cylinder can still transmit torque to the worm wheel when the transmission cylinder moves axially through the sliding cooperation between the locking block and the slot, and finally drive the traveling wheel to rotate, so as to realize the axial clearance movement of the device along the inner wall of the paper tube.

[0012] The invention is further configured such that a cam is fixedly connected to the surface of the first rotating drum, a first sliding rod is fixedly connected to the inner cavity of the drive cylinder, a first drive block is slidably connected to the surface of the first sliding rod, a pressure plate is slidably connected to the inner cavity of the drive cylinder, a first drive wheel is fixedly connected to one side of the pressure plate, and the first drive wheel abuts against the inclined surface of the first drive block. When the first rotating drum drives the cam to rotate, the maximum contour surface of the cam presses against the pressure plate, the pressure plate drives the first drive wheel to move, the first drive wheel drives the first drive block to move, compressing the first spring, and the inclined surface of the first drive block pushes the extension rod and the drive ring to move, ultimately driving the coating roller to adhere to the inner wall of the paper tube body.

[0013] The invention is further configured such that a first spring is sleeved on the surface of the first slide rod, one end of the first spring is fixedly connected to the inner cavity of the drive cylinder, and the other end of the first spring is fixedly connected to one side of the first drive block. Extension rods are fixedly connected to both sides of the first drive block, and the other end of the extension rods extends through to the outside of the drive cylinder and is fixedly connected to a drive ring. The first spring provides a reset force for the first drive block, ensuring that the first drive block can automatically return to its original position after the cam rotates away from the pressure plate. The linkage design of the extension rods and the drive ring converts the linear motion of the first drive block into the radial motion of the drive ring. There are three application rollers, the maximum profile angle of the cam is greater than 120 degrees, and a ball bearing is provided on one side of the drive rod. The drive ring pushes the second drive wheel through the drive rod and the moving plate. The second drive wheel presses the double-sided drive block to drive the application rollers to press against the inner wall for application.

[0014] The invention is further configured such that a movable plate is provided inside the support cylinder, a drive rod is fixedly connected to one side of the movable plate, a second drive wheel is fixedly connected to the other side of the movable plate, a sliding sleeve is fixedly connected to one side of the support frame, a limit rod is slidably connected inside the sliding sleeve, a second spring is sleeved on the surface of the limit rod, a threaded hole is provided on one side of the support cylinder, and a bolt rod is threadedly connected to the inner cavity of the threaded hole, an adjusting plate is rotatably connected to one end of the bolt rod through a bearing seat, a third drive wheel is fixedly connected to one side of the adjusting plate, and a handle is fixedly connected to the other end of the bolt rod. Simultaneously rotating the handle can pre-adjust the initial position of the applicator roller through the third drive wheel to adapt to different inner diameters. The three applicator rollers cooperate with a cam action angle greater than 120 degrees to ensure that the rotation angle of the three applicator rollers is greater than 120 degrees, ensuring no applicator dead angles. The second spring provides the rebound force of the applicator rollers, and the length of the applicator roller is greater than the distance of movement of the travel wheel gap, further avoiding dead angles. The elastic design and length of the applicator rollers ensure the applicator effect.

[0015] The invention is further configured such that a third rotating cylinder is rotatably connected to the inner cavity of the drive cylinder via a bearing seat, a third bevel gear is fixedly connected to the surface of the third rotating cylinder, a fourth bevel gear meshes with the surface of the third bevel gear, and the shaft of the fourth bevel gear is fixedly connected to one end of the threaded rod. The third rotating cylinder serves as a manual adjustment input end, and through the bevel gear pair transmission between the third and fourth bevel gears, the rotational motion is converted into the rotation of the threaded rod, driving the threaded tube to move axially, thereby adjusting the radial position of the mounting frame and the travel wheel.

[0016] The invention is further configured such that a constraint sleeve is fixedly connected to the surface of the threaded tube, and a constraint rod is slidably connected to the inner cavity of the constraint sleeve. One end of the constraint rod is fixedly connected to the surface of the fixed cylinder. The sliding fit between the constraint sleeve and the constraint rod restricts the threaded tube to move only axially, preventing the threaded tube from rotating due to the rotation of the threaded rod, thus ensuring adjustment accuracy. The inner diameters of the first, second, and third rotating cylinders increase sequentially. The constraint rod and constraint sleeve prevent the threaded tube from rotating, ensuring that it only performs linear motion and accurately adjusting the position of the travel wheel. The design of rotating cylinders with different inner diameters facilitates pipeline layout.

[0017] The present invention has the following beneficial effects.

[0018] 1. This invention, through a single drive motor combined with a transmission mechanism including a half-gear, a synchronous belt, and a bevel gear and worm gear, simultaneously achieves continuous rotational spraying of the nozzle and intermittent movement of the entire device. It integrates spraying and smoothing functions into one unit, simplifying the drive structure, reducing manufacturing costs, and improving action coordination and work efficiency. At the same time, by setting up a smearing roller assembly driven by a cam mechanism, the continuously rotating cam periodically pushes the smearing roller to press against the inner wall of the paper tube. While spraying the inner wall, the rotating smearing roller rolls and smooths the coating, making the coating distribution more uniform and effectively avoiding problems such as sagging, material accumulation, and coating dead corners, thereby improving the quality and waterproof effect of the inner wall coating.

[0019] 2. The present invention uses an adjustment mechanism consisting of a third rotating drum, a third bevel gear, a fourth bevel gear, and a threaded rod to manually drive the threaded tube to move axially. With the help of a constraint sleeve and a constraint rod to limit the rotation, it can achieve precise adjustment of the spacing between the three sets of traveling wheels and the coating rollers, adapting to paper tubes with different inner diameters and having a wide range of applications.

[0020] 3. In this invention, the output shaft of the drive motor meshes with the transmission gear through a half gear, converting continuous rotation into intermittent motion. This drives the second rotating drum, the first bevel gear, the second bevel gear, and the transmission drum to rotate intermittently. The transmission drum drives the worm gear to rotate intermittently through a locking block and a locking groove. The worm gear drives the worm wheel and the rotating shaft, ultimately causing the traveling wheel to move intermittently. The self-locking characteristic of the worm wheel and worm gear prevents the device from retracting when the coating is applied, ensuring operational stability. The friction texture on the surface of the traveling wheel enhances the adhesion to the inner wall of the paper tube, preventing slippage.

[0021] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0023] Figure 1 This is a perspective view of a waterproof coating device for the inner wall of a paper tube.

[0024] Figure 2 This is a diagram showing the assembly of a fixed cylinder, a drive cylinder, and a support cylinder in a waterproof coating device for the inner wall of a paper tube.

[0025] Figure 3 This is a diagram showing the fit between the drive rod and the drive ring in a waterproof coating device for the inner wall of a paper tube.

[0026] Figure 4 This is a cross-sectional view of the drive cylinder in a paper tube waterproof coating device.

[0027] Figure 5 This is a diagram showing the arrangement of the first, second, and third rotating drums in a waterproof coating device for the inner wall of a paper tube.

[0028] Figure 6 This is a diagram showing the fit between the worm gear and worm wheel in a waterproof coating device for the inner wall of a paper tube.

[0029] Figure 7 This is a diagram showing the assembly of the second rotating drum, the first bevel gear, and the second bevel gear in a waterproof coating device for the inner wall of a paper tube.

[0030] Figure 8 This is a diagram showing the fit between the worm gear and worm wheel in a waterproof coating device for the inner wall of a paper tube.

[0031] Figure 9 This is a diagram showing the assembly of the third rotating drum, the third bevel gear, and the fourth bevel gear in a waterproof coating device for the inner wall of a paper tube.

[0032] In the attached diagram: 1. Paper tube body; 2. Fixed cylinder; 3. Drive cylinder; 4. First rotating cylinder; 5. Spray nozzle; 6. Paint tube; 7. Support cylinder; 8. Double-sided drive block; 9. Support frame; 10. Coating roller; 11. Threaded rod; 12. Threaded tube; 13. Mounting frame; 14. Drive motor; 15. Half gear; 16. Synchronous belt; 17. Second rotating cylinder; 18. Transmission gear; 19. First bevel gear; 20. Second bevel gear; 21. Transmission cylinder; 22. Worm gear; 23. Worm wheel; 24. Rotating shaft; 25. Traveling wheel; 26. 27. Locking block; 28. Locking slot; 29. ​​Cam; 20. Slide rod; 31. First drive block; 32. Pressure plate; 33. First drive wheel; 34. First spring; 35. Extension rod; 36. Drive ring; 37. Moving plate; 38. Drive rod; 39. Second drive wheel; 40. Sliding sleeve; 41. Limiting rod; 42. Second spring; 43. Bolt rod; 44. Adjusting plate; 45. Third drive wheel; 46. Handle wheel; 47. Third rotating drum; 48. Third bevel gear; 49. Fourth bevel gear; 50. Constraint sleeve; 51. Constraint rod. Detailed Implementation

[0033] The technical solutions of the present invention will be described below with reference to the accompanying drawings. The described embodiments are only some embodiments of the present invention, and not all embodiments.

[0034] Example 1

[0035] Please see Figures 1-9 This invention relates to a waterproof coating device for the inner wall of a paper tube, comprising a paper tube body 1 and a fixed cylinder 2. A drive cylinder 3 is fixedly connected to one side of the fixed cylinder 2. A first rotating cylinder 4 is connected to the inner cavity of the drive cylinder 3 via a bearing seat shaft. A spray pipe 5 is fixedly connected to one end of the first rotating cylinder 4. A coating pipe 6 is movably connected to the first rotating cylinder 4 via a universal joint. A coating mechanism is provided on one side of the spray pipe 5. The coating mechanism includes a support cylinder 7 fixedly connected to one side of the spray pipe 5, a double-sided drive block 8 disposed in the inner cavity of the support cylinder 7, a support frame 9 fixedly connected to one side of the double-sided drive block 8, and a coating roller 10 fixedly connected to the other end of the support frame 9. A drive motor 14 is fixedly connected to one side of the drive cylinder 3. A half gear 15 is fixedly connected to the output shaft of the drive motor 14. A synchronous belt 16 is connected to the surface of the first rotating drum 4 for transmission. The inner cavity of the drive drum 3 is rotatably connected to the second rotating drum 17 through the bearing seat. The second rotating drum 17 extends through to one end of the outer side of the drive drum 3 and is fixedly connected to a transmission gear 18. The surface of the second rotating drum 17 is fixedly connected to a first bevel gear 19. The surface of the first bevel gear 19 is meshed with a second bevel gear 20. The shaft of the second bevel gear 20 is fixedly connected to a transmission drum 21. The inner cavity of the transmission drum 21 is slidably connected to a worm 22. The surface of the worm 22 is meshed with a worm wheel 23. The shaft of the worm wheel 23 is fixedly connected to a rotating shaft 24. The surface of the rotating shaft 24 is fixedly connected to a traveling wheel 25. The surface of the worm 22 is fixedly connected to a locking block 26. The inner side of the transmission drum 21 is provided with a locking groove 27 that matches the locking block 26.

[0036] Further supplement: The drive motor 14, through the combination of the half-gear 15 and the synchronous belt 16, ensures the continuous rotation of the first rotating drum 4 (driven by the synchronous belt 16), and also converts the continuous rotation into intermittent rotation through the intermittent meshing characteristic of the gear 18 with the half-gear 15, providing power for the intermittent movement of the device inside the paper tube. The single drive motor 14 synchronously drives the spray nozzle 5 to rotate for spraying and drives the half-gear 15 to provide power for the intermittent movement, simplifying the structure and reducing costs. There are three mounting brackets 13 and three sets of traveling wheels 25 (two in each set), with the worm gear 23 located between each set of traveling wheels 25. The bevel gear 19 and the second bevel gear 20 form a bevel gear pair. Through bevel gear reversal and worm gear 22 and worm wheel 23 transmission, the intermittent rotation of the second rotating drum 17 is converted into the intermittent rotation of the traveling wheel 25. The self-locking characteristics of the worm wheel 23 and worm gear 22 are used to prevent the device from accidentally moving backward during the spraying process, ensuring operational stability. At the same time, the three sets of traveling wheels 25 are evenly distributed circumferentially, providing stable support. The worm gear 22 in the transmission drum 21 is slidably engaged with the slot 27 through the locking block 26, ensuring that it can still transmit torque to the worm wheel 23 when the transmission drum 21 moves axially, ultimately driving the traveling wheel 25 to rotate, realizing the axial clearance movement of the device along the inner wall of the paper tube.

[0037] Example 2

[0038] Please see Figures 1-9 Based on Embodiment 1, a cam 28 is fixedly connected to the surface of the first rotating drum 4, a first slide rod 29 is fixedly connected to the inner cavity of the drive cylinder 3, a first drive block 30 is slidably connected to the surface of the first slide rod 29, a pressure plate 31 is slidably connected to the inner cavity of the drive cylinder 3, a first drive wheel 32 is fixedly connected to one side of the pressure plate 31, a first spring 33 is sleeved on the surface of the first slide rod 29, one end of the first spring 33 is fixedly connected to the inner cavity of the drive cylinder 3, and the other end of the first spring 33 is fixedly connected to one side of the first drive block 30. Extension rods 34 are fixedly connected to both sides of the first drive block 30, and the other end of the extension rods 34 penetrates to the outside of the drive cylinder 3 and is fixed. A drive ring 35 is fixedly connected to the support cylinder 7. A movable plate 36 is provided inside the support cylinder 7. A drive rod 37 is fixedly connected to one side of the movable plate 36. A second drive wheel 38 is fixedly connected to the other side of the movable plate 36. A sliding sleeve 39 is fixedly connected to one side of the support frame 9. A limit rod 40 is slidably connected inside the sliding sleeve 39. A second spring 41 is sleeved on the surface of the limit rod 40. A threaded hole is provided on one side of the support cylinder 7. A bolt rod 42 is threadedly connected to the inner cavity of the threaded hole. An adjusting plate 43 is rotatably connected to one end of the bolt rod 42 through a bearing seat. A third drive wheel 44 is fixedly connected to one side of the adjusting plate 43. A handle wheel 45 is fixedly connected to the other end of the bolt rod 42.

[0039] Further details: The first drive wheel 32 abuts against the inclined surface of the first drive block 30. When the first rotating drum 4 drives the cam 28 to rotate, the maximum contour surface of the cam 28 presses against the pressure plate 31. The pressure plate 31 drives the first drive wheel 32 to move, and the first drive wheel 32 drives the first drive block 30 to move, compressing the first spring 33. The inclined surface of the first drive block 30 pushes the extension rod 34 and the drive ring 35 to move, ultimately driving the coating roller 10 to adhere to the inner wall of the paper tube body 1. The first spring 33 provides a reset force for the first drive block 30, ensuring that after the cam 28 rotates away from the pressure plate 31, the first drive block 30 can automatically return to its original position. The linkage design of the extension rod 34 and the drive ring 35 converts the linear motion of the first drive block 30 into the radial motion of the drive ring 35. There are three coating rollers 10. The maximum contour angle of the cam 28 is greater than 120 degrees. A ball bearing is provided on one side of the drive rod 37. The drive ring 35 pushes the second drive wheel 38 through the drive rod 37 and the moving plate 36. The driving wheel 38 presses against the double-sided drive block 8 to drive the coating roller 10 to press against the inner wall for coating. Throughout the process, the nozzle 5 rotates continuously under the action of the first rotating cylinder 4 (at the same time, since the nozzle 5 is fixedly connected to the support cylinder 7, the coating roller 10 also rotates continuously. During the rotation of the traveling wheel 25, the coating roller 10 does not contact the inner wall of the paper tube body 1. When the traveling wheel 25 stops, the coating roller 10 contacts the inner wall of the paper tube body 1 to avoid interference from the action). The nozzle 5 sprays the coating material. At the same time, the rotating handle wheel 45 can adjust the initial position of the coating roller 10 in advance through the third drive wheel 44 to adapt to different inner diameters. The three coating rollers 10 cooperate with the action angle of the cam 28, which is greater than 120 degrees, to ensure that the rotation angle of the three coating rollers 10 is greater than 120 degrees, ensuring that there are no coating dead angles. The second spring 41 provides the rebound force of the coating roller 10. The length of the coating roller 10 is greater than the distance of the gap movement of the traveling wheel 25, further avoiding dead angles. The elastic design and length of the coating roller 10 ensure the coating effect.

[0040] Example 3

[0041] Please see Figures 1-9 Based on Embodiments 1 and 2, the inner cavity of the fixed cylinder 2 is provided with an adjustment mechanism. The adjustment mechanism includes a threaded rod 11 rotatably connected to the inner cavity of the fixed cylinder 2 via a bearing seat, a threaded tube 12 sleeved on the surface of the threaded rod 11, and a mounting bracket 13 fixedly connected to one end of the threaded tube 12. The inner cavity of the drive cylinder 3 is rotatably connected to a third rotating cylinder 46 via a bearing seat. A third bevel gear 47 is fixedly connected to the surface of the third rotating cylinder 46. A fourth bevel gear 48 meshes with the surface of the third bevel gear 47. The axis of the fourth bevel gear 48 is fixedly connected to one end of the threaded rod 11. A constraint sleeve 49 is fixedly connected to the surface of the threaded tube 12. A constraint rod 50 is slidably connected to the inner cavity of the constraint sleeve 49. One end of the constraint rod 50 is fixedly connected to the surface of the fixed cylinder 2.

[0042] Further details: The third rotating drum 46 serves as a manual adjustment input. Through the bevel gear pair transmission of the third bevel gear 47 and the fourth bevel gear 48, the rotational motion is converted into the rotation of the threaded rod 11, driving the threaded tube 12 to move axially, thereby adjusting the radial position of the mounting bracket 13 and the travel wheel 25. The sliding fit between the constraint sleeve 49 and the constraint rod 50 restricts the threaded tube 12 to move only axially, preventing the threaded tube 12 from rotating due to the rotation of the threaded rod 11, thus ensuring adjustment accuracy. The inner diameters of the first rotating drum 4, the second rotating drum 17, and the third rotating drum 46 increase sequentially. The constraint rod 50 and the constraint sleeve 49 prevent the threaded tube 12 from rotating, ensuring that it only performs linear motion and accurately adjusts the position of the travel wheel 25. The design of rotating drums with different inner diameters facilitates pipeline layout.

[0043] The working principle of this invention is as follows: First, according to the inner diameter of the paper tube body 1 to be processed, the third rotating drum 46 is manually rotated, and the threaded rod 11 is driven to rotate through the third bevel gear 47 and the fourth bevel gear 48, so that the threaded tube 12 drives the mounting frame 13 and the traveling wheel 25 to move outward until the three sets of traveling wheels 25 contact and press against the inner wall of the paper tube.

[0044] Simultaneously, manually rotate the handle wheel 45 to push the third drive wheel 44 through the bolt rod 42 and the adjusting plate 43, pre-adjusting the initial position of the three coating rollers 10 so that they are close to the inner wall of the paper tube. Place the adjusted device into the paper tube port and start the drive motor 14. The drive motor 14 drives the first rotating drum 4 and its spray nozzle 5 to rotate continuously through the synchronous belt 16. The paint is transported from the inside of the first rotating drum 4 to the rotating spray nozzle 5 through the paint pipe 6 and the universal joint, and sprayed around the inner wall of the paper tube.

[0045] Simultaneously, the output shaft of the drive motor 14 drives the half gear 15 to rotate. The half gear 15 periodically meshes with the transmission gear 18, causing the second rotating drum 17 to rotate intermittently. The second rotating drum 17 drives the transmission drum 21 to rotate intermittently through the first bevel gear 19 and the second bevel gear 20. The transmission drum 21 drives the worm gear 22 to rotate intermittently through the locking block 26 and the locking groove 27. The worm gear 22 drives the worm wheel 23 and the rotating shaft 24, ultimately driving the traveling wheel 25 to rotate intermittently. Because the traveling wheel 25 has friction patterns on its surface and presses against the inner wall of the paper tube, its intermittent rotation drives the device to move.

[0046] When the first rotating drum 4 rotates, the cam 28 on it rotates synchronously. The protruding part of the cam 28 periodically pushes the first drive wheel 32 and the pressure plate 31, causing the first drive block 30 to slide along the first slide rod 29 against the elastic force of the first spring 33. The first drive block 30 pushes the drive ring 35 to move linearly through the extension rods 34 on both sides. The drive ring 35 pushes the drive rod 37 and the moving plate 36 to move towards the double-sided drive block 8 by contacting the ball at the end of the drive rod 37. The second drive wheel 38 on the moving plate 36 moves accordingly and presses an inclined surface of the double-sided drive block 8. After the double-sided drive block 8 is subjected to force, it pushes the support frame 9 to slide outward along the limiting rod 40 against the elastic force of the second spring 41, thereby pressing the coating roller 10 against the inner wall of the paper tube that has been coated with paint by the spray nozzle 5.

[0047] Since the nozzle 5 and the support cylinder 7 rotate together with the first rotating cylinder 4, the rotating coating roller 10 will roll and coat the coating on the inner wall to make it evenly distributed and penetrate. When the protruding part of the cam 28 rotates, the first drive block 30 and drive ring 35 are reset under the action of the first spring 33. Under the action of the second spring 41, the coating roller 10 loosens the inner wall and resets, waiting for the next pressing and coating.

[0048] In this cycle, the device intermittently moves into the paper tube while performing rotary spraying and periodic rotary coating until the waterproof coating of the entire inner wall of the paper tube is completed. The self-locking characteristic of the worm gear 23 and worm 22 mechanism prevents the device from retracting when the coating is applied. The three coating rollers 10 and the cam 28 with an action angle of more than 120 degrees ensure that there are no dead corners in the circumferential direction of coating.

[0049] After the operation is completed, turn off the drive motor 14, remove the device from the paper tube, and rotate the third drum 46 and the handle wheel 45 in the opposite direction to retract the travel wheel 25 and the coating roller 10, and you can prepare for the next operation.

[0050] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A waterproof coating device for the inner wall of a paper tube, comprising a paper tube body (1) and a fixing cylinder (2), characterized in that: A drive cylinder (3) is fixedly connected to one side of the fixed cylinder (2). The inner cavity of the drive cylinder (3) is connected to a first rotating cylinder (4) through a bearing seat shaft. A spray pipe (5) is fixedly connected to one end of the first rotating cylinder (4). A paint pipe (6) is movably connected to the first rotating cylinder (4) through a universal joint. A coating mechanism is provided on one side of the nozzle (5). The coating mechanism includes a support cylinder (7) fixedly connected to one side of the nozzle (5), a double-sided drive block (8) disposed in the inner cavity of the support cylinder (7), a support frame (9) fixedly connected to one side of the double-sided drive block (8), and a coating roller (10) fixedly connected to the other end of the support frame (9). The inner cavity of the fixed cylinder (2) is provided with an adjustment mechanism, which includes a threaded rod (11) rotatably connected to the inner cavity of the fixed cylinder (2) through a bearing seat, a threaded tube (12) sleeved on the surface of the threaded rod (11), and a mounting bracket (13) fixedly connected to one end of the threaded tube (12).

2. The waterproof coating device for the inner wall of a paper tube according to claim 1, characterized in that: A drive motor (14) is fixedly connected to one side of the drive cylinder (3), and a half gear (15) is fixedly connected to the output shaft of the drive motor (14). A synchronous belt (16) is connected between the output shaft of the drive motor (14) and the surface of the first rotating cylinder (4).

3. The waterproof coating device for the inner wall of a paper tube according to claim 1, characterized in that: The inner cavity of the drive cylinder (3) is rotatably connected to a second rotating cylinder (17) via a bearing seat. The second rotating cylinder (17) extends through to one end of the outer side of the drive cylinder (3) and is fixedly connected to a transmission gear (18).

4. The waterproof coating device for the inner wall of a paper tube according to claim 3, characterized in that: A first bevel gear (19) is fixedly connected to the surface of the second rotating drum (17), a second bevel gear (20) meshes with the surface of the first bevel gear (19), a transmission drum (21) is fixedly connected to the shaft of the second bevel gear (20), a worm (22) is slidably connected to the inner cavity of the transmission drum (21), a worm wheel (23) meshes with the surface of the worm (22), a rotating shaft (24) is fixedly connected to the shaft of the worm wheel (23), and a traveling wheel (25) is fixedly connected to the surface of the rotating shaft (24).

5. The waterproof coating device for the inner wall of a paper tube according to claim 4, characterized in that: The worm (22) is fixedly connected to a locking block (26), and the transmission cylinder (21) has a locking groove (27) that matches the locking block (26) on its inner side.

6. The waterproof coating device for the inner wall of a paper tube according to claim 1, characterized in that: A cam (28) is fixedly connected to the surface of the first rotating cylinder (4), a first slide rod (29) is fixedly connected to the inner cavity of the drive cylinder (3), a first drive block (30) is slidably connected to the surface of the first slide rod (29), a pressure plate (31) is slidably connected to the inner cavity of the drive cylinder (3), and a first drive wheel (32) is fixedly connected to one side of the pressure plate (31).

7. The waterproof coating device for the inner wall of a paper tube according to claim 6, characterized in that: A first spring (33) is sleeved on the surface of the first slide rod (29). One end of the first spring (33) is fixedly connected to the inner cavity of the drive cylinder (3), and the other end of the first spring (33) is fixedly connected to one side of the first drive block (30). Extension rods (34) are fixedly connected to both sides of the first drive block (30), and the other end of the extension rod (34) extends through to the outside of the drive cylinder (3) and is fixedly connected to a drive ring (35).

8. The waterproof coating device for the inner wall of a paper tube according to claim 1, characterized in that: The inner cavity of the support cylinder (7) is provided with a movable plate (36). A drive rod (37) is fixedly connected to one side of the movable plate (36), and a second drive wheel (38) is fixedly connected to the other side of the movable plate (36). A sliding sleeve (39) is fixedly connected to one side of the support frame (9). A limit rod (40) is slidably connected to the inner cavity of the sliding sleeve (39). A second spring (41) is sleeved on the surface of the limit rod (40). A threaded hole is provided on one side of the support cylinder (7), and a bolt rod (42) is threadedly connected to the inner cavity of the threaded hole. An adjusting plate (43) is rotatably connected to one end of the bolt rod (42) through a bearing seat. A third drive wheel (44) is fixedly connected to one side of the adjusting plate (43), and a handle wheel (45) is fixedly connected to the other end of the bolt rod (42).

9. The waterproof coating device for the inner wall of a paper tube according to claim 1, characterized in that: The inner cavity of the drive cylinder (3) is rotatably connected to a third rotating cylinder (46) via a bearing seat. A third bevel gear (47) is fixedly connected to the surface of the third rotating cylinder (46). A fourth bevel gear (48) meshes with the surface of the third bevel gear (47). The axis of the fourth bevel gear (48) is fixedly connected to one end of the threaded rod (11).

10. The waterproof coating device for the inner wall of a paper tube according to claim 1, characterized in that: A constraint sleeve (49) is fixedly connected to the surface of the threaded tube (12), and a constraint rod (50) is slidably connected to the inner cavity of the constraint sleeve (49). One end of the constraint rod (50) is fixedly connected to the surface of the fixed cylinder (2).

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