Coating printing system

Abstract

The utility model discloses a paint printing system, which comprises a printing roller, a printing roller and a printing roller, the printing roller is used for making contact with a base material so that the base material can be coated with paint on the printing roller. The feeding roller is used for rotating around the axial direction of the feeding roller, and the axial direction of the feeding roller is parallel to the axial direction of the printing roller; a filling gap is formed between the feeding roller and the printing roller; the discharging opening is located above the feeding roller; the discharge port is used for allowing paint to flow to any one or more of the feeding roller, the printing roller and the filler gap; the feeding roller is used for coating the printing roller with paint in the gap between the feeding roller and the filler. According to the utility model, the wetting uniformity of coating on the surface of the printing roller can be improved, the coating uniformity and stability are improved, and the qualified rate and stability of coated products are improved.

Description

Technical Field

[0001] The utility model relates to the field of automobile interior decoration, in particular to a paint printing system. Background Art

[0002] PVC leather, primarily composed of polyvinyl chloride, is a common synthetic material widely used in automotive interiors. Painting is a crucial process step to achieve a variety of desired colors and improve its appearance and durability. Painting not only provides a wide range of color options for PVC leather but also enhances its surface's wear resistance and aging resistance. Furthermore, painting can simulate the texture and appearance of real leather, making it look and feel closer to natural leather, satisfying consumers' dual demands for both aesthetics and quality.

[0003] The existing method for painting PVC leather involves drawing paint into a paint tray with a minimum height of approximately 5 cm to ensure the printing roller is fully immersed. The rotating roller then scrapes the surface of the roller flat, ensuring that the lines on the roller are fully filled with paint. The scraper then scrapes off any excess paint. Finally, the rotating roller transfers the lifted paint to the PVC leather surface, completing the printing process. However, this painting method presents numerous problems, including the high cost and high volume of paint required. During the printing process, paint circulation within the paint tray is poor, leading to surface crusting. When bubbles are mixed with paint from the roller, they burst after passing through the scraper, causing localized gaps in the paint and resulting in defects. The paint lifted by the inertia of the rotation can fluctuate in the amount of paint due to changes in the surface viscosity of the paint. Occasionally, the lines on the roller may not be fully filled with paint, resulting in uneven thickness or uneven surface finish after printing. This can lead to surface defects, gloss, and color instability in the printed product. Utility Model Content

[0004] The purpose of this utility model is to solve the problem of uneven coating and localized lack of coating on the printing roller surface, which leads to defects in printed products. The utility model provides a coating printing system that can improve the wetting uniformity of the coating on the printing roller surface, improve the uniformity and stability of the coating, and improve the qualified rate and stability of the coated products.

[0005] In order to solve the above technical problems, an embodiment of the present utility model discloses a paint printing system, comprising: a printing roller for rotating around its axial direction; the printing roller is used to contact with a substrate to apply the paint on the printing roller to the substrate; a loading roller for rotating around its axial direction, the axial direction of the loading roller and the axial direction of the printing roller are parallel; a filler gap is provided between the loading roller and the printing roller; a discharge port is located above the loading roller; the discharge port is used to supply paint to any one or more of the loading roller, the printing roller and the filler gap; wherein, the loading roller is used to apply the paint on the loading roller and the filler gap to the printing roller.

[0006] With this technical solution, the paint flows out of the discharge port above the feed roller and onto one or more of the printing roller, feed roller, and filler gaps. As the feed roller and printing roller rotate, the feed roller applies its own paint and the paint in the filler gap to the printing roller through rotation. It also assists the printing roller in evenly applying the paint, fully wetting the printing roller and ensuring it is fully coated. The fully wetted printing roller then transfers the paint to the substrate above and in contact with it, completing the printing of the substrate.

[0007] In summary, the embodiment of the present application adopts upper feeding (i.e., the discharge port is located above the loading roller) and adds a loading roller to cooperate with the printing roller, so that the coating flowing out of the discharge port can be rotated by the mutual cooperation of the loading roller and the printing roller. With the assistance of the loading roller, the wetting uniformity of the coating on the surface of the printing roller is improved, the coating uniformity and stability are improved, and the qualified rate and stability of the coated products are improved.

[0008] According to another specific embodiment of the present invention, in the height direction, the highest end point of the feeding roller is lower than the highest end point of the printing roller, and the discharge port is located between the highest end point of the feeding roller and the highest end point of the printing roller.

[0009] By adopting the above technical solution, the discharge port is located between the highest end point of the feeding roller and the highest end point of the printing roller, and the paint flowing out of the discharge port can also flow more accurately to any one or more points in the gap between the printing roller, the feeding roller and the filler, thereby facilitating the cooperation between the feeding roller and the printing roller to achieve wetting of the printing roller.

[0010] According to another specific embodiment of the present invention, the coating printing system includes a recovery tank, which is located below the feeding roller and the printing roller.

[0011] According to another specific embodiment of the present invention, the paint printing system includes a paint pool, which is used to accommodate paint and is connected to the discharge port and the recovery tank.

[0012] By adopting the above technical solution, the paint in the paint pool can flow to the discharge port, and then flow from the discharge port to any one or more of the feeding roller, printing roller and filler gap. A part of the paint on the feeding roller, printing roller and filler gap falls into the recovery tank, and the paint in the recovery tank finally flows back to the paint pool, thereby forming a circulation flow path. On the one hand, it realizes the recycling of the paint, and on the other hand, it makes the paint active through circulation to prevent the paint from settling and skinning.

[0013] According to another specific embodiment of the present invention, the paint printing system includes a material guide pipe and a flow regulating component, the material guide pipe includes a feeding pipe and a discharging pipe, the feeding pipe is connected to the paint pool, and the discharging pipe is connected to the discharge port; the flow regulating component is provided on the side of the discharging pipe close to the feeding pipe.

[0014] According to another specific embodiment of the present invention, the flow regulating assembly includes a flap; the discharge pipe is provided with a connecting port, which is used to connect the feeding pipe and the discharge pipe; the flap is provided at the connecting port and can rotate relative to the pipe wall of the discharge pipe to adjust the opening of the flap.

[0015] According to another specific embodiment of the present invention, the flow regulating assembly further includes a handle, which is located outside the discharge pipe, and one end of the handle passes through the pipe wall of the discharge pipe and is fixedly connected to the flap.

[0016] With this technical solution, a flap is positioned at the connection port, partially obstructing it. Rotating the flap relative to the wall of the discharge pipe at a set angle adjusts its opening, thereby adjusting the area obstructed by the connection port. Conversely, rotating the flap relative to the wall of the discharge pipe at a set angle adjusts the exposed area of ​​the connection port, which in turn determines the flow rate of paint flowing from the feed and discharge pipes. Specifically, when a large amount of paint drips into the recovery tank from gaps between the feed roller, printing roller, and filler, the flap can be rotated to reduce the exposed area of ​​the connection port, thereby reducing the flow rate. Conversely, when the amount of paint on the print roller surface is insufficient, the flap can be adjusted to increase the exposed area of ​​the connection port, thereby increasing the flow rate and maintaining an optimal amount of paint wetting between the print and feed rollers.

[0017] According to another specific embodiment of the present invention, the flow regulating assembly also includes a limiter, which is fixed on the pipe wall outside the discharge pipe, and is provided with a plurality of limiter protrusions, which are arranged in a circular arc shape to correspond to different rotation angles of the handle; a limiter recess is provided on the handle, and the limiter recess is engaged with the limiter protrusion to keep the handle at the set angle.

[0018] By adopting the above technical solution, the handle drives the flap to rotate, that is, the handle also rotates synchronously relative to the limit member. Every time the handle rotates a set angle, there corresponds to a limit protrusion, and the limit concave portion is engaged with the limit protrusion, so that the handle maintains the angle, that is, the flap remains at the opening.

[0019] According to another specific embodiment of the present invention, the material of the loading roller is steel; the loading roller is provided with a cooling channel, and the cooling channel is used for circulation of cooling fluid.

[0020] By adopting the above technical solution, the cooling channel can be used for the circulation of cooling fluid, and the cooling fluid flows to cool the loading roller, and the loading roller simultaneously cools the paint in contact with it, so that the paint temperature is maintained within the required standard range.

[0021] According to another specific embodiment of the present invention, the filler gap between the feeding roller and the printing roller is 1 mm to 5 mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram showing a coating printing system according to an embodiment of the prior art;

[0023] Figure 2 A schematic diagram showing a coating printing system according to an embodiment of the present invention is shown;

[0024] Figure 3 A three-dimensional diagram showing a flow regulating assembly according to an embodiment of the present invention installed on a material guiding pipe is shown. DETAILED DESCRIPTION

[0025] The following is an explanation of the implementation of the present invention by means of specific specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this utility model are limited to this implementation. On the contrary, the purpose of introducing the utility model in conjunction with the implementation is to cover other options or modifications that may be extended based on the claims of the present invention. In order to provide an in-depth understanding of the present invention, the following description will contain many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0026] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0027] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as a limitation on the utility model.

[0028] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0029] In the description of this embodiment, it should be noted that, unless otherwise specified or limited, the terms "disposed," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this embodiment based on specific circumstances.

[0030] In order to make the purpose, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0031] Figure 1 The present invention shows a coating printing system 100 in one embodiment, which includes a coating pool 11, a coating tray 12, a printing roller 13, a scraper 14, an auxiliary roller 15, a pressure roller 16, and a tension roller 17. The coating pool 11 is used to hold coating (e.g., paint), and a circulation path 18 is provided between the coating pool 11 and the coating tray 12. Specifically, the coating pool 11 is used to supply coating to the coating tray 12, and the coating in the coating tray 12 can flow back to the coating pool 11, thereby forming a reciprocating circulation to prevent coating sedimentation and skinning.

[0032] A portion of the printing roller 13 is immersed in the paint tray 12 and can rotate relative to the paint tray 12. The printing roller 13 picks up the paint by rotating, and then the scraper 14 flattens the surface of the printing roller 13 to ensure that the lines on the surface of the printing roller 13 are filled with paint, and then scrapes off the excess paint.

[0033] Above the printing roller 13 is the auxiliary roller 15, and above the auxiliary roller 15 is the pressure roller 16. A substrate 19 (such as PVC leather) is transmitted between the auxiliary roller 15 and the printing roller 13. The pressure roller 16 applies downward pressure to the auxiliary roller 15, so that the auxiliary roller 15 presses the substrate 19 against the printing roller 13, thereby transferring the coating on the printing roller 13 to the substrate 19, thereby realizing printing of the substrate 19.

[0034] The two tension rollers 17 are located on both sides of the auxiliary roller 15. The two tension rollers 17 are in contact with the substrate 19 to form a tensioning force on the substrate 19, thereby improving the flatness of the substrate 19 and facilitating printing.

[0035] This implementation method has many problems, such as:

[0036] 1. The amount of paint in the paint tray 12 must be maintained at a set height (for example, greater than 5 cm) to wet the printing roller 13. After printing is completed, the paint in the paint tray 12 needs to be scrapped, resulting in waste and increasing costs;

[0037] 2. During the printing process, the paint circulation in the paint tray 12 is poor, and the surface is prone to crusting;

[0038] 3. When the paint brought up by the printing roller 13 contains bubbles, the bubbles will burst after passing through the scraper 14, resulting in local material shortages, causing product coating to be missed and forming defects;

[0039] 4. The paint carried by the inertia of rotation will cause the amount of paint to fluctuate due to the change of the viscosity of the paint surface. Occasionally, the paint in the pattern of the printing roller 13 is not full, resulting in uneven thickness or uneven surface after printing, which will bring about surface defects of the printed product, fluctuations in gloss and color difference stability, etc.

[0040] In view of this, reference Figure 2 The embodiment of the present application provides another coating printing system 200, including: a printing roller 21, a feeding roller 22, a scraper 23, an auxiliary roller 24, a tension roller 25, a pressure roller 26, a coating pool 27, and a recovery tank 28.

[0041] The printing roller 21 is driven by a motor (not shown) to rotate around its axis; the printing roller 21 is used to contact the substrate 20 so that the coating (such as paint) on the printing roller 21 is applied to the substrate 20.

[0042] Similar to the previous embodiment, the printing roller 21 of this embodiment is also located above an auxiliary roller 24. Above the auxiliary roller 24 is a pressure roller 26. A substrate 20 (e.g., PVC leather) passes between the auxiliary roller 24 and the printing roller 21. The pressure roller 26 applies downward pressure to the auxiliary roller 24, causing the auxiliary roller 24 to press the substrate 20 against the printing roller 21. This transfers the coating from the printing roller 21 to the substrate 20, thereby achieving printing on the substrate 20. Two tension rollers 25 are located on either side of the auxiliary roller 24. The two tension rollers 25 contact the substrate 20 to apply tension to the substrate 20, improving its flatness and facilitating printing.

[0043] Those skilled in the art will understand that in this embodiment, the substrate 20 is PVC leather and the coating is paint, that is, the coating printing system 200 is used to coat PVC leather with paint. However, in other embodiments, the coating printing system 200 can also coat other types of coatings on other substrates, such as coating glue on the surface of paper.

[0044] like Figure 2 As shown, unlike the previous embodiment, this embodiment includes a feeding roller 22. The feeding roller 22 is also driven by a motor to rotate about its axis. The axis of the feeding roller 22 is parallel to the axis of the printing roller 21, that is, the feeding roller 22 and the printing roller 21 are arranged in parallel. For example, the feeding roller 22 is made of steel, and the steel feeding roller 22 can cool the paint in contact with it.

[0045] A filler gap 29 is provided between the feeding roller 22 and the printing roller 21 .

[0046] It should be noted that the printing method used in this embodiment is gravure printing. That is, the printing roller 21 is provided with multiple grooves (not shown) for filling with paint. To prevent direct contact and friction between the feed roller 22 and the printing roller 21, which would squeeze and damage the grooves on the surface of the printing roller 21, the feed roller 22 and the printing roller 21 are spaced apart, with a small gap (i.e., filler gap 29) between them.

[0047] The coating pool 27 is located below the loading roller 22 and away from the printing roller 21. The coating pool 27 is connected to the discharge port 33 via the material guide pipe 30. In other words, the coating pool 27 supplies the discharge port 33 with material. For example, the coating pool 27 is provided with a stirring system 270 and a feeding pump (not shown). The stirring system 270 is used to stir the coating to keep the coating in a constant state of motion, preventing the coating from settling and skinning. The feeding pump is used to pump the coating in the coating pool 27 to the discharge port 33. In this embodiment, the coating pool 27 is a stirred kettle.

[0048] The discharge port 33 is located above the feeding roller 22 ; the discharge port 33 is used to allow the coating to flow to any one or more of the feeding roller 22 , the printing roller 21 and the filler gap 29 . That is, the discharge port 33 can be facing the printing roller 21 so that the coating flows onto the printing roller 21; it can also be facing the filler gap 29 so that the coating flows to the filler gap 29; similarly, the discharge port 33 can also be facing the loading roller 22 so that the coating flows onto the loading roller 22; further, the discharge port 33 can be directed toward the connection between the printing roller 21 and the filler gap 29, that is, a part of the discharge port 33 is directed toward the printing roller 21, and the other part is directed toward the filler gap 29, so that a part of the coating flows onto the printing roller 21, and a part flows to the filler gap 29; similarly, the discharge port 33 can be directed toward the connection between the loading roller 22 and the filler gap 29, that is, a part of the discharge port 33 is directed toward the filler gap 29, and the other part is directed toward the loading roller 22, so that a part of the coating flows to the filler gap 29, and a part flows to the loading roller 22; it can be understood that when the discharge port 33 is facing the filler gap 29, and when the coating flow rate is large, the coating can flow to the loading roller 22, the printing roller 21 and the filler gap 29 at the same time.

[0049] The filler gap 29 between the feed roller 22 and the printing roller 21 can range from 1 mm to 5 mm. The specific value can be selected based on the viscosity of the paint and the required amount of paint. For example, when the paint viscosity is low, or when the amount of paint scraped off by the scraper 23 is large, resulting in a large amount of paint dripping from the filler gap 29, it indicates a large amount of paint. In this case, the filler gap 29 should be set smaller, for example, to 2 mm, to prevent excessive paint dripping. Conversely, when the paint viscosity is high, or when the amount of paint on the printing roller 21 is insufficient to wet the printing roller 21, the filler gap 29 can be increased, for example, to 4 mm.

[0050] It should be noted that, in this embodiment, the printing roller 21 and the feeding roller 22 are almost in contact but not in contact, that is, the printing roller 21 and the feeding roller 22 themselves are not in contact, but when the filler gap 29 is filled with paint, the printing roller 21 and the feeding roller 22 will be indirectly in contact through the paint.

[0051] For example, Figure 2 As shown, in the height direction Z, the highest end point A of the feeding roller 22 is lower than the highest end point B of the printing roller 21, and the discharge port 33 is located between the highest end point A of the feeding roller 22 and the highest end point B of the printing roller 21, so that it is convenient to set the discharge port 33, and the paint flowing out of the discharge port 33 can also flow more accurately to any one or more places in the printing roller 21, the feeding roller 22 and the filler gap 29, so as to facilitate the cooperation between the feeding roller 22 and the printing roller 21 to achieve wetting of the printing roller 21.

[0052] The loading roller 22 is used to apply the coating material from the loading roller 22 and the filler gap 29 to the printing roller 21. Specifically, the coating material flowing from the material guide pipe 30 is passed through the loading roller 22 and the printing roller 21 through the mutual cooperation. That is, the loading roller 22 and the printing roller 21 rotate relative to each other. On the one hand, the coating material from the loading roller 22 and the filler gap 29 is applied to the printing roller 21. On the other hand, the printing roller 21 is assisted to apply the coating material evenly, so that the printing roller 21 is fully wetted, ensuring that the grooves of the printing roller 21 are filled with a sufficient amount of coating material, thereby improving the printing effect and reducing the risk of coating leakage.

[0053] For example, in Figure 2 In the illustrated viewing angle, the loading roller 22 rotates clockwise and the printing roller 21 rotates counterclockwise, meaning they rotate in opposite directions. However, those skilled in the art will appreciate that in other embodiments, the loading roller 22 and the printing roller 21 may rotate in the same direction. For example, if the viscosity of the coating is very low, the loading roller 22 and the printing roller 21 may rotate in the same direction to ensure a uniform coating on the printing roller 21.

[0054] For example, the rotational speeds of the feed roller 22 and the printing roller 21 can be adjusted by their corresponding motors. For example, when insufficient paint is applied to the printing roller 21, resulting in localized coating leaks, the speed of the feed roller 22 can be increased to improve the wetting effect on the printing roller 21, thereby preventing defects and even the possibility of downtime caused by defects. If the scraper 23 scrapes off a large amount of paint, resulting in a large amount of paint dripping from the printing roller 21, this indicates that the feed roller 22 has applied a large amount of paint to the printing roller 21. The speed of the feed roller 22 can be reduced to reduce the amount of paint applied to the printing roller 21.

[0055] The recovery trough 28 is located below the feed roller 22 and the printing roller 21. It is easy to understand that a small amount of paint will drip from the printing roller 21, the feed roller 22 and the filler gap 29. The recovery trough 28 is located below the feed roller 22 and the printing roller 21 to recover the dripping paint and prevent it from dripping onto the ground, causing waste and environmental pollution.

[0056] Furthermore, the paint pool 27 is connected to the discharge port 33 and the recovery tank 28. That is, the paint in the paint pool 27 can flow to the discharge port 33 through the material guide pipe 30, and then flow from the discharge port 33 to any one or more of the feed roller 22, the printing roller 21, and the filler gap 29. A portion of the paint on the feed roller 22, the printing roller 21, and the filler gap 29 falls into the recovery tank 28, and the paint in the recovery tank 28 finally flows back to the paint pool 27, thus forming a circulation flow path. On the one hand, it realizes the recycling of the paint, and on the other hand, it makes the paint active through circulation to prevent the paint from settling and skinning.

[0057] With the above technical solution, the paint in the paint pool 27 flows along the material guide pipe 30 to the discharge port 33 under the action of the feeding pump. The paint flows out of the discharge port 33 and flows to any one or more of the printing roller 21, the feeding roller 22, and the filler gap 29. The feeding roller 22 and the printing roller 21 rotate, and the feeding roller 22 applies the paint on itself and the paint in the filler gap 29 to the printing roller 21 through rotation. On the other hand, the feeding roller 22 assists the printing roller 21 in evenly applying the paint, so that the printing roller 21 is fully and evenly wetted, ensuring that the grooves of the printing roller 21 are filled with a sufficient amount of paint. The fully wetted printing roller 21 then transfers the paint in its grooves to the substrate 20 located above and in contact with it, thereby completing the printing of the substrate 20.

[0058] In the process of the paint flowing from the discharge port 33 to the printing roller 21, the feeding roller 22 and the filling gap 29, and in the process of the feeding roller 22 applying the paint on itself and the paint in the filling gap 29 to the printing roller 21 by rotating, a small amount of paint will drip into the recovery tank 28, and the paint in the recovery tank 28 will finally flow back to the paint pool 27.

[0059] In summary, the embodiment of the present application adopts upper feeding (i.e., the discharge port 33 is located above the loading roller 22) and adds a loading roller 22 to cooperate with the printing roller 21, so that the paint flowing out of the discharge port 33 can be evenly coated on the printing roller 21 through the rotation of the loading roller 22 and the printing roller 21, thereby improving the wetting uniformity of the paint on the surface of the printing roller 21, ensuring that the groove of the printing roller 21 is filled with sufficient paint, improving the coating uniformity and stability, and improving the qualified rate and stability of the coated product.

[0060] On the other hand, the embodiment of the present application adopts the upper feeding, that is, compared with the above embodiment, this solution does not need the paint tray 12 ( Figure 1 As shown), there is no need for the printing roller to be immersed in a large amount of paint in the paint tray 12. The paint circulation process of this solution requires very little paint, and after printing is completed, the amount of paint that needs to be scrapped is small, thereby reducing waste and lowering costs.

[0061] like Figure 2 As shown, the material guide pipe 30 includes a feed pipe 31 and a discharge pipe 32. The feed pipe 31 is connected to the paint tank 27, and the discharge pipe 32 is connected to the discharge port 33. A flow regulating assembly 40 is provided on the side of the discharge pipe 32 near the feed pipe 31. For example, the flow regulating assembly 40 is used to regulate the flow of paint from the feed pipe 31 to the discharge pipe 32 to prevent excessive dripping of paint into the recovery tank 28.

[0062] In some possible implementations, such as Figure 2 and Figure 3As shown, the flow regulating assembly 40 includes a flap 41; the discharge pipe 32 is provided with a connecting port 320, which is used to connect the feeding pipe 31 and the discharge pipe 32; the flap 41 is provided at the connecting port 320 and can rotate relative to the pipe wall of the discharge pipe 32 to adjust the opening of the flap 41.

[0063] In some possible embodiments, the flow regulating assembly 40 further includes a handle 42, which is located outside the discharge pipe 32. One end of the handle 42 passes through the wall of the discharge pipe 32 and is fixedly connected to the flap 41. For example, the discharge pipe 32 includes a first wall 321 and a second wall 322. The first wall 321 is provided with a first opening 323. The flap 41 is provided with a rotating shaft 324 on a side adjacent to the first wall 321. The rotating shaft 324 is inserted into the first opening 323 and is rotatable relative to the first opening 323. Correspondingly, the second wall 322 is provided with a second opening 325, through which the handle 42 extends. The handle 42 is rotatable relative to the second opening 325, thereby achieving a rotatable connection between the flap 41 and the wall of the discharge pipe 32. On the other hand, this embodiment realizes the detachable connection between the flap 41 and the discharge pipe 32 through the shaft hole matching (the matching of the rotating shaft 324 and the first opening 323, and the matching of the handle 42 and the second opening 325), so as to facilitate the disassembly of the flap 41 after printing is completed for cleaning the flap 41.

[0064] Exemplarily, the handle 42 is L-shaped, so that the operator can rotate the flap 41 by holding the handle 42 .

[0065] It is easy to understand that the flap 41 is arranged at the connection port 320 to partially block the connection port 320, and the flap 41 is rotated to a set angle relative to the pipe wall of the discharge pipe 32 to adjust the opening of the flap 41, that is, to adjust the size of the blocking area of ​​the connection port 320. Conversely, the flap 41 is rotated to a set angle relative to the pipe wall of the discharge pipe 32 to adjust the exposed area of ​​the connection port 320, and the exposed area determines the flow rate of paint flowing from the feeding pipe 31 into the discharge pipe 32. Specifically, when a large amount of paint drips from the feeding roller 22, the printing roller 21 and the filler gap 29 to the recovery tank 28, the exposed area of ​​the connecting port 320 can be reduced by rotating the flap 41 to reduce the flow rate, and the feeding speed of the feeding pump in the paint pool 27 can be reduced simultaneously; conversely, when the amount of paint on the surface of the printing roller 21 is insufficient, the flap 41 can be adjusted to increase the exposed area of ​​the connecting port 320 to increase the flow rate, and the feeding speed of the feeding pump in the paint pool 27 can be increased simultaneously to maintain the optimal amount of wetting paint between the printing roller 21 and the feeding roller 22.

[0066] In some possible embodiments, the flow regulating assembly 40 further includes a stopper 43, which is fixed to the outer side of the second tube wall 322 of the discharge pipe 32. The stopper 43 is provided with a plurality of stopper protrusions 430, which are arranged in an arc shape to correspond to different rotation angles of the handle 42. The handle 42 is provided with a stopper recess (not shown in the figure), which engages with the stopper protrusions 430 to maintain the handle 42 at a set angle. For example, the stopper 43 is in an arc shape, and the stopper protrusions 430 are arranged at intervals on the stopper 43, thereby forming a stopper protrusion 430 distributed in an arc shape.

[0067] Exemplarily, the limiting protrusion 430 is in a columnar shape, and the limiting recess is in a groove shape. Then, the limiting protrusion 430 is inserted into the limiting groove, thereby achieving relative fixation of the handle 42 and the limiting member 43.

[0068] Specifically, the handle 42 drives the flap 41 to rotate, that is, the handle 42 also rotates synchronously relative to the limit member 43. Every time the handle 42 rotates a set angle (for example, 25°), it corresponds to a limit protrusion 430, and the limit recess is engaged with the limit protrusion 430, so that the handle 42 maintains the angle, that is, the flap 41 remains at the opening.

[0069] Those skilled in the art will understand that in the present embodiment, the flow rate of the paint entering the discharge pipe 32 from the feeding pipe 31 is controlled by adjusting the angle of the flap 41, but in other embodiments, other methods may be used to adjust the flow rate of the paint entering the discharge pipe 32 from the feeding pipe 31, such as providing a retractable baffle at the connection port 320 to control the flow rate by pulling out the baffle.

[0070] Furthermore, in other embodiments, the relative fixation of the handle 42 after being rotated to a set angle may also be achieved by other means, such as screw connection.

[0071] In some possible embodiments, the loading roller 22 is provided with a cooling channel (not shown) for circulating a cooling fluid. For example, the cooling channel allows a cooling fluid (e.g., water) to circulate, and the cooling fluid cools the loading roller 22, which in turn cools the coating material in contact therewith, thereby maintaining the coating material temperature within a desired standard range.

[0072] Although the present invention has been illustrated and described with reference to certain preferred embodiments of the present invention, it should be understood by those skilled in the art that the above description is provided to further illustrate the present invention in conjunction with specific embodiments, and that the present invention should not be construed as being limited to these descriptions. Those skilled in the art may make various changes in form and detail, including simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A coating printing system, characterized in that: include: a printing roller, adapted to rotate about its axis; The printing roller is used to contact the substrate to apply the coating on the printing roller to the substrate; a feeding roller, configured to rotate around its axial direction, wherein the axial direction of the feeding roller is parallel to the axial direction of the printing roller; a filler gap is provided between the feeding roller and the printing roller; A discharge port is located above the feeding roller; the discharge port is used to supply the coating to any one or more of the feeding roller, the printing roller and the filler gap; The feeding roller is used to apply the coating of the feeding roller and the filler gap to the printing roller.

2. The coating printing system according to claim 1, wherein: In the height direction, the highest end point of the feeding roller is lower than the highest end point of the printing roller, and the discharge port is located between the highest end point of the feeding roller and the highest end point of the printing roller.

3. The coating printing system according to claim 1, wherein: The coating printing system includes a recovery trough located below the feeding roller and the printing roller.

4. The coating printing system according to claim 3, wherein: The paint printing system includes a paint pool, which is used to contain paint and is connected to the discharge port and the recovery tank.

5. The coating printing system according to claim 4, wherein: The paint printing system includes a material guide pipe and a flow regulating component. The material guide pipe includes a feeding pipe and a discharging pipe. The feeding pipe is connected to the paint pool, and the discharging pipe is connected to the discharging port. The flow regulating component is provided on the side of the discharging pipe close to the feeding pipe.

6. The coating printing system according to claim 5, wherein: The flow regulating assembly includes a flap; the discharge pipe is provided with a connecting port, which is used to connect the feeding pipe and the discharge pipe; the flap is provided at the connecting port and can rotate relative to the pipe wall of the discharge pipe to adjust the opening of the flap.

7. The coating printing system according to claim 6, wherein: The flow regulating assembly further includes a handle, which is located outside the discharge pipe, and one end of the handle passes through the pipe wall of the discharge pipe and is fixedly connected to the flap.

8. The coating printing system according to claim 7, wherein: The flow regulating assembly also includes a limiter, which is fixed on the pipe wall outside the discharge pipe. The limiter is provided with a plurality of limit protrusions, and the plurality of limit protrusions are arranged in an arc shape to correspond to different rotation angles of the handle; the handle is provided with a limit recess, and the limit recess is engaged with the limit protrusion to keep the handle at a set angle.

9. The coating printing system according to claim 1, wherein: The material of the feeding roller is steel; the feeding roller is provided with a cooling channel, and the cooling channel is used for the circulation of cooling fluid.

10. The coating printing system according to claim 1, wherein: The filler gap between the feeding roller and the printing roller is 1 mm to 5 mm.

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