A roll coating device and a coating method

Abstract

The application discloses a roller coating device and a coating method, and belongs to the field of roller coating devices. The roller coating device comprises a lower supporting base, a scraper system and a roller fixing device. The lower supporting base is provided with a lower clamp for fixing the lower end shaft of the roller. The roller fixing device is provided with an upper clamp for fixing the upper end shaft of the roller. The scraper system comprises a circular ring-shaped scraper, a first sliding block, a first screw rod and a driving motor. The circular ring-shaped scraper is nested on the surface of the roller. The circular ring-shaped scraper is connected with the first sliding block. The first sliding block is connected with the first screw rod. The first screw rod is connected with the driving motor. The driving motor drives the first sliding block to move through the first screw rod, so as to drive the circular ring-shaped scraper to move. The roller coating device and the method can scrape and coat the glue on the surface of the roller more uniformly.

Description

[0001] This application relates to the field of roller coating, specifically to a roller coating apparatus and coating method. Background Technology

[0002] Cylindrical roller molds are widely used in printed product manufacturing due to their high dimensional accuracy. Furthermore, their ability to enable continuous production significantly improves production efficiency and reduces costs, making them popular among businesses. In product manufacturing, a uniform thickness of adhesive is typically applied to the surface of the cylindrical roller to ensure consistent dimensional accuracy. Common devices for applying adhesive to roller surfaces include roller coating machines and spray coating machines, which are more suitable for rollers shorter than one meter. However, the increasing demand for larger products has created a need for larger roller molds. When the roller length is two meters or more, the increased dimensional deviation of the roller itself and the limitations of spray coating equipment make it difficult to achieve a uniform thickness of adhesive on the roller surface using either roller coating or spray coating. Therefore, achieving uniform adhesive application on the surface of large-sized rollers has become a pressing problem for companies. Summary of the Invention

[0003] The purpose of this application is to provide a roller coating apparatus that achieves uniform thickness coating of adhesive on the surface of large-size rollers. Furthermore, this application also provides a simple, rapid, and stable method for applying adhesive of uniform thickness to the surface of large-size rollers.

[0004] The technical solution provided in this application is as follows: A roller coating apparatus, comprising: Lower support base, scraper system and roller fixing device; The lower support is equipped with a lower clamp for fixing the lower end shaft of the roller; The roller fixing device is equipped with an upper clamp for fixing the upper end shaft of the roller; The scraper system includes an annular scraper, a first slider, a first lead screw, and a drive motor. The annular scraper is nested on the surface of the roller. The annular scraper is connected to the first slider, the first slider is connected to the first lead screw, and the first lead screw is connected to the drive motor. The drive motor drives the first slider to move through the first lead screw, thereby driving the annular scraper to move on the surface of the roller.

[0005] The roller coating device of this application includes a lower support, a scraper system, and a roller fixing device. The lower support and the roller fixing device are used to fix the lower and upper shafts of the roller, respectively, thereby maintaining the stability of the roller when it is upright. Compared with the transverse equipment, the roller in this application remains upright, so that the roller itself and the glue on its surface are subjected to a uniform downward gravity, avoiding bending deformation caused by uneven gravity at different positions of the transverse roller, and uneven thickness caused by uneven force on the glue on the roller surface. This application sets a circular scraper nested on the cylindrical surface of the roller. The circular scraper is driven by a drive motor, a first lead screw, and a first slider to slide axially along the cylindrical surface of the roller. The movement of the circular scraper is based on the first lead screw, keeping the roller axis parallel to the first lead screw axis. During the process of the circular scraper sliding and scraping glue on the roller surface, the gap between any position of the circular scraper edge and the roller surface is kept equal, thereby achieving uniform glue coating on the cylindrical surface of the roller.

[0006] In one embodiment, the scraper system further includes a third slider and a fourth slider, the annular scraper being connected to the third slider, the third slider being located on the fourth slider, and the fourth slider being located on the first slider.

[0007] In one embodiment, a first screw is provided on the fourth slider, and a third slider is nested on the first screw. The distance between the annular scraper blade and the roller surface in the X direction is adjusted by the first screw. A second screw is provided on the first slider, and the fourth slider is nested on the second screw. The distance between the annular scraper blade and the roller surface in the Z direction is adjusted by the second screw.

[0008] In one embodiment, the first lead screw axis is parallel to the roller axis.

[0009] In one embodiment, the annular scraper is funnel-shaped.

[0010] In one embodiment, the annular scraper is formed by two semi-annular scrapers connected movably.

[0011] In an embodiment of this application, the roller coating device further includes a glue conveying system, which includes a glue conveying pipe, a glue storage tank, and a second slider. The glue conveying pipe is disposed on the second slider, which is nested on the first lead screw. The second slider drives the glue conveying pipe to slide along the roller axis, and the port of the glue conveying pipe is located above the annular scraper.

[0012] A roller coating method, implemented based on the roller coating apparatus described in any one of the preceding claims, includes: S1. The roller is hoisted and fixed on the clamp: The roller is hoisted upright, and the lower end shaft and the upper end shaft of the roller are fixed on the lower clamp of the lower support base and the upper clamp of the roller fixing device, respectively. S2. The annular scraper is nested on the surface of the roller, with the annular scraper located at one end of the roller near the lower support. S3. Adjust the gap between the annular scraper and the roller surface: Rotate the first screw to adjust the distance between the cutting edge of the annular scraper and the roller surface in the X direction; rotate the second screw to adjust the distance between the cutting edge of the annular scraper and the roller surface in the Z direction; so that the distance between any position of the annular cutting edge of the annular scraper and the circumferential surface of the roller is equal. S4. Start the scraper system, so that the annular scraper moves at a constant speed from the end near the lower support to the end away from the lower support, to the set roller coating position, clean the remaining glue on the scraper or roller surface, remove the roller, and complete the uniform coating of glue on the roller surface.

[0013] In the embodiments of this application, it is only necessary to hoist and fix the roller to the lower clamp of the lower support base and the upper clamp of the roller fixing device, and turn on the power of each component of the device to automatically complete the coating of the roller with uniform thickness. Therefore, this application provides a simple, fast and stable method for coating a uniform thickness of adhesive on the surface of a large roller.

[0014] In one embodiment, step S0 is included before step S1: pre-coating the roller surface with adhesive.

[0015] In one embodiment, between step S3 and step S4, step S31 is further included: starting the glue supply system and adding glue to the roller surface above the annular scraper. Beneficial effects

[0016] The roller coating apparatus of this application includes a lower support, a scraper system, and a roller fixing device. The lower support and roller fixing device are used to fix the lower and upper shafts of the roller, respectively, thereby maintaining the stability of the roller when it is upright. In this application, the roller remains upright, which, relative to the transverse equipment, allows the roller itself and the glue on its surface to be subjected to a uniform downward gravity, avoiding bending deformation caused by uneven gravity at different positions of the transverse roller, and uneven thickness caused by uneven force on the glue on the roller surface. This application sets a circular scraper nested on the cylindrical surface of the roller. The circular scraper is driven by a drive motor, a first lead screw, and a first slider to slide axially along the cylindrical surface of the roller. The movement of the circular scraper is based on the first lead screw, keeping the roller axis parallel to the first lead screw axis. During the process of the circular scraper sliding and scraping glue on the roller surface, the gap between any position of the circular scraper edge and the roller surface is kept equal, thereby achieving uniform glue coating on the cylindrical surface of the roller.

[0017] The adhesive application method of this application can easily, quickly, and stably apply adhesive of uniform thickness to the surface of large-size rollers. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a roller coating device according to this application; Figure 2 This is a schematic diagram of the scraper system structure of this application; Figure 3 This is a schematic diagram of the shape of the annular scraper in this application; Figure 4 This is a schematic diagram of the annular scraper structure of this application; Figure 5 This is a schematic diagram of the glue delivery system structure of this application; Figure 6 This is a flowchart of the adhesive application method of this application.

[0019] The meanings of the reference numerals in the figure are as follows: 1-Lower support; 11-Lower caliper; 2-Scraper system; 21-Annular scraper; 22-First slider; 23-First lead screw; 24-Drive motor; 25-Third slider; 251-First screw; 26-Fourth slider; 261-Second screw; 3-Roller fixing device; 31-Upper caliper; 4-Roller; 41-Lower shaft; 42-Upper shaft; 51-Glue delivery pipe; 52-Glue storage tank; 53-Second slider. Detailed Implementation

[0020] The terminology used in the implementation section of this application is only for explaining specific embodiments of this application and is not intended to limit this application. The "axial" label in the figures is for the purpose of explaining the mounting device in the accompanying drawings of specific embodiments of this application and is not intended to limit this application. Example 1

[0021] like Figure 1 As shown, a roller coating device includes: Lower support 1, scraper system 2 and roller fixing device 3; The lower support 1 is provided with a lower clamp 11 for fixing the lower end shaft 41 of the roller 4; The roller fixing device 3 is equipped with an upper clamp 31 for fixing the upper end shaft 42 of the roller 4; The scraper system 2 includes an annular scraper 21, a first slider 22, a first lead screw 23, and a drive motor 24. The annular scraper 21 is nested on the surface of the roller 4. The annular scraper 21 is connected to the first slider 22, the first slider 22 is connected to the first lead screw 23, and the first lead screw 23 is connected to the drive motor 24. The drive motor 24 drives the first slider 22 to move through the first lead screw 23, thereby driving the annular scraper 21 to move on the surface of the roller 4, so as to scrape the glue on the surface of the roller 4 evenly.

[0022] To further explain, the lower caliper 11 and the upper caliper 31 are general-purpose machine tool fixtures such as three-jaw chuck, four-jaw chuck, or flat-jaw vise.

[0023] In one embodiment, a bracket is provided on one side of the lower support 1, and the roller fixing device 3 is rotatably connected to the bracket. Rotating the roller fixing device 3 can enable the upper clamp 31 to clamp the upper end shaft 42 of the roller to fix the roller 4, or to separate from the upper end shaft 42 of the roller, so that the roller can be removed from the device.

[0024] In one embodiment, by adding a drive motor to provide power to the lower clamp 11 on the lower support 1 or the upper clamp on the roller fixing device 3, the roller is driven to rotate, which plays an auxiliary role in uniform glue application or glue pre-curing in subsequent processes.

[0025] To further explain, the lower support 1 and the roller fixing device 3 are used to fix the lower and upper shafts of the roller, respectively, thereby maintaining the stability of the roller after it is upright. Keeping the roller upright, relative to the transverse roller device, ensures that the roller itself and the adhesive on its surface are subjected to a uniform downward gravity, avoiding roller surface bending deformation caused by uneven gravity at different positions of the transverse roller, and uneven thickness caused by uneven force on the adhesive on the roller surface. During the process of the annular scraper sliding and scraping the adhesive on the roller surface, the gap between any position of the annular scraper edge and the roller surface can be maintained at an equal level, thereby achieving uniform adhesive coating thickness on the cylindrical surface of the roller.

[0026] To further explain, the drive motor drives the first lead screw, which in turn drives the first slider, thereby providing the power for the annular scraper to slide along the roller axis.

[0027] In one implementation, such as Figure 2 As shown, the scraper system 2 also includes a third slider 25 and a fourth slider 26. The annular scraper 21 is connected to the third slider 25, the third slider 25 is located on the fourth slider 26, and the fourth slider 26 is located on the first slider 22.

[0028] In one embodiment, a first screw 251 is provided on the fourth slider 26, and a third slider 25 is nested on the first screw 251. The distance between the cutting edge of the annular scraper 21 and the surface of the roller 4 in the X direction is adjusted by rotating the first screw 251. A second screw 261 is provided on the first slider, and the fourth slider 26 is nested on the second screw 261. The distance between the cutting edge of the annular scraper 21 and the surface of the roller 4 in the Z direction is adjusted by rotating the second screw 261.

[0029] To further explain, the first screw 251 passes through the third slider 25 and connects to the fourth slider 26 along the X-direction. Rotating the first screw 251 allows the third slider to slide along the axial direction of the first screw, thereby moving the annular scraper 21 along the X-direction. The second screw 261 passes through the fourth slider 26 and connects to the first slider 22 along the Z-direction. Rotating the second screw 261 allows the fourth slider to move the third slider and the annular scraper together along the Z-direction. These configurations allow for adjustment of the distance between the scraper and the roller surface in both the X and Z directions.

[0030] In one embodiment, the first lead screw 23 is axially parallel to the roller 4.

[0031] To further explain, the annular scraper 21 is detachably connected to the third slider 25. This detachability is achieved through a screw connection. By detachably connecting the scraper 21 to the third slider 25, it is convenient to replace different models of annular scrapers according to the roller size and coating thickness. The annular scraper 21 is nested on the cylindrical surface of the roller. On one hand, the third slider 25 can drive the scraper to slide along the roller axial direction. On the other hand, the third slider 25, the fourth slider 26, and the first slider 22 are connected to form a sliding reference with the first lead screw 23 as the sliding reference. The first lead screw is parallel to the roller axial direction, so the sliding of the annular scraper is also relative to the cylindrical surface of the roller. This keeps the gap between the annular scraper and the cylindrical surface of the roller stable and ensures the uniformity of the coating thickness.

[0032] In one implementation, such as Figure 3 As shown, the annular scraper 21 is funnel-shaped.

[0033] To further explain, the funnel-shaped annular doctor blade has a precise dimensional gap between its lower edge and the roller surface to ensure even application of the adhesive. The area where the gap widens towards the upper end of the blade allows for the storage of adhesive scraped off by the lower edge of the annular doctor blade. This stored adhesive replenishes any areas lacking sufficient adhesive during the roller application process, reducing waste. It can also be used to store adhesive supplied from the glue delivery system, which is then evenly coated onto the roller surface by the annular doctor blade.

[0034] In one implementation, such as Figure 4As shown, the annular scraper 21 is composed of two semi-circular scrapers connected together.

[0035] To further explain, the annular scraper 21 is composed of two semi-circular or more fan-shaped scrapers connected together, which facilitates the operation of the annular scraper nested on the cylindrical surface of the roller and allows for the replacement of the annular scraper at any time, and helps to adjust the gap between the cutting edge of the annular scraper and the roller surface.

[0036] In one implementation, such as Figure 5 As shown, the roller coating device also includes a glue conveying system, which includes a glue conveying pipe 51, a glue storage tank 52, and a second slider 53. The glue conveying pipe 51 is mounted on the second slider 53, which is nested on the first lead screw. The end of the glue conveying pipe 51 is located above the annular scraper 21, conveying glue to the roller surface. The second slider 53 drives the glue conveying pipe 51 to slide along the roller axial direction, conveying glue to the roller surface.

[0037] To further explain, the second slider can drive the glue delivery tube to slide along the roller axis, which can automatically replenish glue to the roller surface above the annular scraper, and then the annular scraper will evenly scrape the glue onto the roller surface.

[0038] In one embodiment, the second slider 53 can also be nested separately on the second lead screw (not shown in the figure). The second lead screw is connected to a drive motor, which can be shared with the drive motor of the first lead screw, or a separate drive motor can be added. The drive motor controls the movement of the second slider 53 by rotating the second lead screw, thereby driving the glue delivery tube to move along the roller axis.

[0039] To further explain, one feasible approach is that before the roller is clamped into the roller coating device of this application, the roller surface has already been coated with glue. The device then scrapes the glue evenly, and the glue delivery system only replenishes the glue in areas on the roller surface where there is insufficient glue. Another approach is that before the roller is clamped into the roller coating device of this application, the roller surface is not coated with glue. The glue is fed onto the roller surface through the glue delivery system, and the glue on the roller surface is scraped evenly by a circular scraper.

[0040] In one embodiment, the roller coating device of this application may also be equipped with a curing device to pre-cure and shape the adhesive on the roller surface.

[0041] In summary, the roller coating device of this application includes a lower support 1, a scraper system 2, and a roller fixing device 3. The lower support 1 and the roller fixing device 3 are used to fix the lower end shaft 41 and the upper end shaft 42 of the roller, respectively, thereby maintaining the stability of the roller after it is upright. This application keeps the roller upright, and relative to the transverse equipment, the roller itself and the glue on its surface are subjected to a uniform downward gravity, avoiding bending deformation caused by uneven gravity at different positions of the transverse roller, and uneven thickness caused by uneven force on the glue on the roller surface. This application sets a circular scraper nested on the cylindrical surface of the roller. The drive motor 24, the first lead screw 23, and the first slider 22 jointly drive the circular scraper to slide axially along the cylindrical surface of the roller. The movement of the circular scraper is based on the first lead screw, keeping the roller axis parallel to the first lead screw axis. During the process of the circular scraper sliding and scraping glue on the roller surface, the gap between any position of the circular scraper edge and the roller surface is kept equal, thereby achieving uniform glue coating on the cylindrical surface of the roller. Example 2

[0042] This embodiment discloses a roller coating method, which is based on the roller coating device of Embodiment 1. The specific process flow is as follows: Figure 6 As shown, it includes: S1. Roller hoisting and fixing on clamps: The roller is hoisted upright, and the lower end shaft and upper end shaft of the roller are respectively fixed on the lower clamp of the lower support base and the upper clamp of the roller fixing device; S2. The scraper is nested on the surface of the roller, with the annular scraper located at the end of the roller near the lower support. To further explain, in one embodiment, the annular scraper can be assembled from multiple semi-circular or fan-shaped components, so that even after the shafts at both ends of the roller are fixed by clamps, the annular scraper can still be nested on the roller surface by assembling the semi-circular or fan-shaped components into an annular scraper.

[0043] S3. Adjust the gap between the annular scraper and the roller surface: Rotate the first screw to adjust the distance between the annular scraper blade and the roller surface in the X direction; rotate the second screw to adjust the distance between the annular scraper blade and the roller surface in the Z direction; so that the distance between any position of the annular scraper blade and the circumferential surface of the roller is equal. To further explain, the first screw 251 passes through the third slider 25 and connects to the fourth slider 26 along the X-direction. Rotating the first screw 251 allows the third slider to slide along the axial direction of the first screw, thereby moving the annular scraper 21 along the X-direction. The second screw 261 passes through the fourth slider 26 and connects to the first slider 22 along the Z-direction. Rotating the second screw 261 allows the fourth slider to move the third slider and the annular scraper together along the Z-direction. These settings allow for adjustment of the distance between the annular scraper and the roller surface in both the X and Z directions, ensuring that the distance between any position of the annular cutting edge of the annular scraper and the circumferential surface of the roller is equal.

[0044] S4. Start the scraper system, so that the annular scraper moves at a constant speed from the end near the lower support to the end away from the lower support, until the set roller coating position is reached. Clean the remaining glue on the annular scraper or roller surface, remove the roller, and complete the uniform coating of glue on the roller surface.

[0045] In the embodiments of this application, it is only necessary to hoist and fix the roller to the clamps of the lower support and the roller fixing device, and turn on the power of each component of the device to automatically complete the coating of the roller with uniform thickness. Therefore, this application provides a simple, fast and stable method for coating a uniform thickness of adhesive on the surface of a large roller.

[0046] In one embodiment, step S2 can be performed simultaneously with step S1. That is, after the roller is hoisted and erected, before the upper shaft is inserted into the upper clamp and the lower shaft is inserted into the lower clamp for fixation, step S2 is performed. Then, the annular scraper is nested on the surface of the roller, and the lower shaft of the roller is fixed on the lower clamp and the upper shaft is fixed on the upper clamp. After that, step S3 is performed.

[0047] In one embodiment, step S0 is included before step S1: pre-coating the roller surface with adhesive.

[0048] In one embodiment, between step S3 and step S4, step S31 is further included: starting the glue supply system and adding glue to the roller surface above the annular scraper.

[0049] In one embodiment, step S5 is included after step S4: turning on the curing device to pre-cur and shape the adhesive on the roller surface.

[0050] The adhesive application method of this application can easily, quickly, and stably apply adhesive of uniform thickness to the surface of large-size rollers.

[0051] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A roller coating device, characterized in that, include: Lower support base, scraper system and roller fixing device; The lower support is equipped with a lower clamp for fixing the lower end shaft of the roller; The roller fixing device is equipped with an upper clamp for fixing the upper end shaft of the roller; The scraper system includes an annular scraper, a first slider, a first lead screw, and a drive motor. The annular scraper is nested on the surface of the roller. The annular scraper is connected to the first slider, the first slider is connected to the first lead screw, and the first lead screw is connected to the drive motor. The drive motor drives the first slider to move through the first lead screw, thereby driving the annular scraper to move on the surface of the roller.

2. The roller coating apparatus according to claim 1, characterized in that, The scraper system further includes a third slider and a fourth slider, with the annular scraper connected to the third slider, the third slider located on the fourth slider, and the fourth slider located on the first slider.

3. The roller coating apparatus according to claim 2, characterized in that, The fourth slider is provided with a first screw, and the third slider is nested on the first screw. The distance between the cutting edge of the annular scraper and the roller surface in the X direction is adjusted by the first screw. The first slider is provided with a second screw, and the fourth slider is nested on the second screw. The distance between the cutting edge of the annular scraper and the roller surface in the Z direction is adjusted by the second screw.

4. The roller coating apparatus according to claim 1, characterized in that, The first lead screw axis is parallel to the roller axis.

5. The roller coating apparatus according to claim 1, characterized in that, The annular scraper is funnel-shaped.

6. The roller coating apparatus according to claim 1, characterized in that, The annular scraper is composed of two semi-circular scrapers connected together.

7. The roller coating apparatus according to claim 1, characterized in that, It also includes a glue conveying system, which includes a glue conveying pipe, a glue storage tank, and a second slider. The glue conveying pipe is disposed on the second slider, which is nested on the first lead screw. The second slider drives the glue conveying pipe to slide along the roller axis, and the end of the glue conveying pipe is located above the annular scraper.

8. A roller coating method, implemented based on the roller coating apparatus according to any one of claims 1-7, characterized in that, include: S1. The roller is hoisted and fixed on the clamp: The roller is hoisted upright, and the lower end shaft and the upper end shaft of the roller are fixed on the lower clamp of the lower support base and the upper clamp of the roller fixing device, respectively. S2. The annular scraper is nested on the surface of the roller, with the annular scraper located at one end of the roller near the lower support. S3. Adjust the gap between the annular scraper and the roller surface: Rotate the first screw to adjust the distance between the cutting edge of the annular scraper and the roller surface in the X direction; rotate the second screw to adjust the distance between the cutting edge of the annular scraper and the roller surface in the Z direction; so that the distance between any position of the annular cutting edge of the annular scraper and the circumferential surface of the roller is equal. S4. Start the scraper system, so that the annular scraper moves at a constant speed from the end near the lower support to the end away from the lower support, to the set roller coating position, clean the remaining glue on the annular scraper and / or roller surface, remove the roller, and complete the uniform coating of glue on the roller surface.

9. The roller coating method according to claim 8, characterized in that, The process includes step S0 before step S1: pre-coating the roller surface with adhesive.

10. The roller coating method according to claim 8, characterized in that, Between step S3 and step S4, step S31 is also included: starting the glue supply system and adding glue to the roller surface above the annular scraper.

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