Three-roller fine back coating machine for color coating production line

Abstract

The invention relates to the technical field of color coating equipment, and discloses a three-roller fine back coating machine for a color coating production line, the three-roller fine back coating machine comprises a rack, a paint extracting roller and a paint coating roller, brackets are fixedly mounted on two sides of the rack, an air homogenizing plate for emitting airflow to the back of a plate strip is mounted between the two brackets, and a plurality of air holes are formed in the air homogenizing plate at equal intervals; the three-roller fine back coating machine for the color coating production line is characterized in that a plurality of air holes are formed in the two supports, an air outlet part is installed in each air hole, a supporting frame body is arranged on one side of the air uniformizing plate, a heating mechanism is installed in the supporting frame body, and driving mechanisms used for driving the supporting frame body to move directionally are arranged on the two supports. Air flow can be emitted to the back face of the plate strip through the air uniformizing plate and the multiple air holes and the air outlet parts in the air uniformizing plate so as to form an air flowing layer, the air flowing layer effectively slows down the flowing speed of paint in a wet paint film, meanwhile, the air flow generates upward acting force on the surface of the wet paint film, and the viscosity between the paint surface and the plate strip is combined; and the sagging phenomenon is obviously inhibited.

Description

Technical Field

[0001] This invention relates to the field of color coating equipment technology, specifically a three-roll precision back coating machine for a color coating production line. Background Technology

[0002] The three-roll precision back coating machine for color coating production lines is a core piece of equipment used for surface coating of continuous roll materials (such as metal sheets and strips, plastic films). Its core function is to uniformly transfer paint or functional coatings to the back of the sheet / strip (i.e., the side in contact with the equipment facing down) through the coordinated action of the coating roller, metering roller, and conveyor roller. In a typical three-roll structure, the coating roller is responsible for directly transferring the coating to the sheet / strip surface, the metering roller adjusts the coating thickness through the gap, and the conveyor roller picks up the coating from the paint tray and transfers it to the coating roller. According to the driving method, it can be divided into collective drive and single-roll drive: the former relies on a single motor to control all rollers, which limits process adjustment; the latter uses an independent motor to drive each roller, which can flexibly adjust the speed and direction, and is more suitable for high-precision coating requirements. In the actual workflow, the strip is pulled horizontally by the traction mechanism, and the coating roller rotates counterclockwise below the strip (reverse coating process). The paint carried by the roller surface contacts the back of the strip and completes the coating. The coated strip continues to move forward, with the painted surface facing down towards the curing area. Although the three-roll precision back coating machine is superior to the two-roll system in terms of coating accuracy, in actual operation, because the painted surface of the strip is facing down, the uncured wet paint film is prone to sagging under the action of gravity, resulting in uneven coating thickness and dripping. Existing solutions mainly rely on coating formula optimization (such as adding thickeners) or reducing production line speed to alleviate sagging, but the former sacrifices the fluidity of the paint, and the latter reduces production efficiency. Therefore, we propose a three-roll precision back coating machine for color coating production lines. Summary of the Invention

[0003] The purpose of this invention is to provide a three-roll precision back coating machine for a color coating production line to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a three-roll fine back coating machine for a color coating production line, comprising a frame, a paint lifting roller, and a paint coating roller. Supports are fixedly installed on both sides of the frame. A gas equalization plate is installed between two of the supports to distribute airflow to the back of the strip. Multiple air vents are equidistantly arranged on the gas equalization plate, and an air outlet is installed inside each air vent. A support frame is provided on one side of the gas equalization plate, and a heating mechanism is installed inside the support frame. The heating mechanism distributes hot airflow to the back of the strip to heat the coated back surface. A drive mechanism is provided on the two supports to drive the directional movement of the support frame. The coated strip passes through the gas equalization plate, which distributes airflow through the air outlet. Pre-curing with the airflow suppresses sagging, and then the coated surface of the strip is heated and cured under the action of the heating mechanism.

[0005] Preferably, the air outlet includes an air inlet channel and an air outlet channel installed inside the air vent. The air outlet channel includes multiple elastic metal sheets connected to the ends of the air inlet channel and a silicone sleeve fitted on the multiple elastic metal sheets. The silicone sleeve is subjected to force to change its aperture. Multiple spring parts are installed on the inner wall of the air vent, and the spring parts are in contact with the elastic metal sheets.

[0006] Preferably, an annular sleeve is provided inside the air outlet channel, and the annular sleeve is connected to the air distribution plate by a fixed rod frame. The annular sleeve and the fixed rod frame are rotatably connected. An extension shaft is also installed inside the annular sleeve, and the end of the extension shaft penetrates the inner wall of the annular sleeve and extends into the air inlet channel. A hollow sphere is installed on the extension shaft, and a blade is fixedly installed at one end of the extension shaft located in the air inlet channel.

[0007] Preferably, the diameter of the air outlet channel is larger than the diameter of the air inlet channel.

[0008] Preferably, the annular sleeve has multiple support rods slidably connected to its inner wall installed inside. Each support rod has an operating panel fixedly installed at its end, and the operating panel is in contact with the silicone sleeve. A square frame is also installed at one end of the support rod inside the annular sleeve. A telescopic part is provided between the square frame and the extension shaft. The telescopic part is fixedly connected to the end of the extension shaft, and one end of the telescopic part is slidably connected to the square frame.

[0009] Preferably, the drive mechanism includes chain wheels corresponding to two supports one-to-one, and the chain wheels are connected by a rotating shaft. A servo motor is fixedly installed on the support. One end of the rotating shaft is fixedly connected to the output end of the servo motor, and the ends of the other rotating shafts are rotatably connected to the inner wall of the support. Multiple action plate frames are also fixedly installed on the chain wheels.

[0010] Preferably, positioning sliders are fixedly installed at both ends of the support frame, and telescopic shafts are installed on the positioning sliders. Ball bearings are embedded at the ends of the telescopic shafts. A force-bearing shaft is also installed on the positioning slider and rotatedly connected thereto. The force-bearing shaft is located on the motion trajectory of the action plate frame.

[0011] Preferably, a positioning guide rail is fixedly installed on the side wall of the bracket, and a sliding block is installed on the positioning guide rail and slidably connected thereto. A constant force spring is connected between the sliding block and the positioning guide rail. A guide shaft is installed on the positioning slider, and the guide shaft is slidably connected to the sliding block. A return spring is also connected between the guide shaft and the sliding block.

[0012] Preferably, the side wall of the bracket is provided with a limiting groove, and the end of the telescopic shaft slides within the limiting groove. The limiting groove includes a straight-line area, an inclined downward area, a sliding area, and a straight upward area.

[0013] Preferably, guide panels are installed at the junction of the inclined descent area and the sliding area, as well as between the straight upward area and the straight area. One side of the guide panel is an inclined surface, and the other side is a right-angled surface.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention uses a uniform air distribution plate and multiple vents and air outlets to distribute airflow to the back of the strip, forming an airflow layer. This airflow layer effectively slows down the flow rate of the paint inside the wet paint film. At the same time, the airflow exerts an upward force on the surface of the wet paint film. Combined with the viscosity between the paint surface and the strip, this significantly inhibits sagging and improves the coating quality. Furthermore, the air outlet channel, which can be adjusted according to the airflow volume, ensures that the airflow can act evenly and stably on the coated surface of the strip, improving the pre-curing effect and avoiding uneven pre-curing caused by changes in airflow.

[0015] 2. This invention sets up a support frame and a heating mechanism on one side of the gas equalization plate, and uses a driving mechanism to drive the support frame to move in an directional manner, so that the heating mechanism can move synchronously with the plate and strip. This design ensures that the plate and strip are heated uniformly immediately after coating, which accelerates the curing process of the paint film, further suppresses the sagging phenomenon, and improves production efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the present invention; Figure 3 This is a schematic diagram of the internal structure of the bracket of the present invention; Figure 4 This is a schematic diagram of the internal structure of the gas distribution plate and heating mechanism of the present invention within the frame; Figure 5 This is a schematic diagram of the air distribution plate structure of the present invention; Figure 6 This is a schematic diagram of the internal structure of the vent holes in this invention; Figure 7 This is a schematic diagram of the structure of the air inlet channel and air outlet channel within the vent hole of the present invention; Figure 8 This is a schematic diagram of the air outlet channel structure of the present invention; Figure 9 This is a schematic diagram of the annular sleeve structure of the present invention; Figure 10 This is a schematic diagram of the supporting frame structure of the present invention; Figure 11 This is a schematic diagram of the sidewall structure of the bracket of the present invention; Figure 12 This is a schematic diagram of a partial internal structure of the support frame of the present invention.

[0017] In the diagram: 1. Frame; 2. Paint roller; 3. Paint roller; 4. Support; 41. Positioning guide rail; 42. Sliding block; 43. Constant force spring; 44. Limiting groove; 45. Straight travel area; 46. Inclined descent area; 47. Sliding area; 48. Straight upward travel area; 49. Guide panel; 5. Air distribution plate; 51. Vent hole; 52. Air outlet; 53. Air inlet channel; 54. Air outlet channel; 541. Elastic metal sheet; 542. Silicone sleeve; 55. Spring part; 56. Annular sleeve; 57. Fixing rod frame; 58. Extension shaft 59. Hollow sphere; 50. Blade; 501. Support rod frame; 502. Action panel; 503. Square frame; 504. Telescopic part; 6. Support frame; 61. Heating mechanism; 62. Positioning slider; 63. Telescopic shaft; 64. Force-bearing shaft; 65. Guide shaft; 66. Return spring; 7. Drive mechanism; 71. Chain wheel; 72. Rotating shaft; 73. Servo motor; 74. Action plate frame; 8. Support roller; 9. First coating roller; 10. Second coating roller; 11. Third coating roller; 12. Scraper mechanism. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figures 1-12 This invention provides a technical solution: a three-roll fine back coating machine for a color coating production line. This invention addresses the problems mentioned in the background section of the prior art, preventing strip from sagging after back coating. Specifically, it includes a frame 1, a paint lifting roller 2, and a paint coating roller 3, combined with... Figure 1 and attached Figure 2 As shown, this invention can perform coating operations on both the front and back sides of the strip. The support 4 is also equipped with a support roller 8 and multiple coating rollers, combined with the attached... Figure 2As shown, the multiple coating rollers, from left to right, are the first coating roller 9, the second coating roller 10, and the third coating roller 11. The strip moves along the area between the third coating roller 11 and the support roller 8. When coating the front side of the strip, the second coating roller 10 rotates to lift the paint onto the roller surface, and the first coating roller 9 rotates to smooth the paint lifted by the second coating roller 10. At the same time, the paint carried away by the first coating roller 9 is scraped off by a scraper (not shown in the figure). The adjusted paint film on the second coating roller 10 continues to rotate with the second coating roller 10 and then contacts the third coating roller 11. The third coating roller 11 rotates to transfer the paint on the surface of the second coating roller 10 to the third coating roller 11. The third coating roller 11 continues to rotate to transfer the paint to the front side of the strip. At this time, the strip is coated.

[0020] If the back of the strip is coated, the paint lifting roller 2 rotates to bring the paint onto the roller surface, and then contacts the coating roller 3. A paint film is formed in the gap between the coating roller 3 and the paint lifting roller 2. The coating roller 3 transfers the paint film to the back of the strip. In actual operation, during the back coating process, because the coated surface is facing down, it is prone to dripping due to gravity. Based on this, the present invention is designed as follows: brackets 4 are fixedly installed on both sides of the frame 1, and an air distribution plate 5 is fixedly installed between the side walls of the two brackets 4. The air distribution plate 5 disperses airflow to the back of the strip. The air distribution plate 5 is close to the coating roller 3. It should be noted that the air distribution plate 5 in the present invention is connected to the air channel. The air channel is actually a pipe used to transport airflow. Since designing an airflow transport pipe is a common technical means in the field, the present invention does not describe it in detail. The air channel transports airflow with a certain temperature into the air distribution plate 5. Normally, the airflow entering the air distribution plate 5... The airflow temperature is typically 35℃-40℃. Multiple vent holes 51 are evenly spaced on the air distribution plate 5, and each vent hole 51 has an air outlet 52 installed inside. In practical applications, the strip is coated with different types of paint depending on the working conditions, and the coating thickness, paint viscosity, and other characteristics vary. Consequently, the airflow rate will also change. To improve the pre-curing effect of the airflow on the coating layer, the air outlet 52 in this invention can automatically adjust its aperture size according to the airflow rate of the air passage. Therefore, when the air distribution plate 5 emits airflow, it can directly act on the coating surface of the strip, i.e., the wet paint film surface, to form an airflow layer. This airflow layer can slow down the flow rate of the paint inside the wet paint film, thus achieving a pre-curing effect to a certain extent. Furthermore, under the action of the emitted airflow, the airflow can generate an upward force on the wet paint film surface. Combined with the viscosity between the paint surface and the strip, this can effectively suppress sagging.

[0021] Combined with appendix Figure 7 and attached Figure 8As shown, as a further limitation of the present invention, the air outlet 52 includes an air inlet channel 53 and an air outlet channel 54 installed inside the air vent 51. The diameter of the air outlet channel 54 is larger than that of the air inlet channel 53. The air outlet channel 54 includes a plurality of elastic metal sheets 541 connected to the ends of the air inlet channel 53 and a silicone sleeve 542 sleeved on the plurality of elastic metal sheets 541. The silicone sleeve 542 is subjected to force to change its diameter. A plurality of spring parts 55 are installed on the inner wall of the air vent 51, and the spring parts 55 are in contact with the elastic metal sheets 541. When a force is applied to the silicone sleeve 542, the silicone sleeve 542 will cause the elastic metal sheets 541 to change. It should be noted that the silicone sleeve 542 and the elastic metal sheets 541 should be made of materials with a small elastic coefficient. In actual application, they can be specifically selected according to the air passage volume. Other elastic materials can also be used for the elastic metal sheets 541.

[0022] Combined with appendix Figure 5 Appendix Figure 6 and appendix Figure 9As shown, an annular sleeve 56 is also provided inside the air outlet channel 54, and the annular sleeve 56 is connected to the air distribution plate 5 via a fixed rod 57. The annular sleeve 56 and the fixed rod 57 are rotatably connected. An extension shaft 58 is also installed inside the annular sleeve 56, and the end of the extension shaft 58 penetrates the inner wall of the annular sleeve 56 and extends into the air inlet channel 53. A hollow sphere 59 is installed on the extension shaft 58, and the hollow sphere 59 is located at the air outlet end of the air inlet channel 53. The outer diameter is close to the inner diameter of the intake channel 53, and a blade 50 is fixedly installed at one end of the extension shaft 58 located inside the intake channel 53. During the upward movement of the airflow within the intake channel 53, the airflow exerts a force on the blade 50. Therefore, the rotational speed of the blade 50 can effectively reflect the airflow rate. If the airflow rate is large, since the orifice diameter of the intake channel 53 is a constant, according to the formula Q=AV (where A is the cross-sectional area of ​​the intake channel 53, Q represents the flow rate, and V represents the velocity), when the flow rate increases, the airflow... The gas flow rate within the air channel 53 will increase. To avoid excessive flow rate affecting the coating surface, the aperture of the air outlet channel 54 can be changed to effectively form a uniform and stable airflow field, ensuring that the entire strip coating surface is subjected to uniform airflow. Furthermore, multiple support rods 501 are installed inside the annular sleeve 56 and slidably connected to its inner wall. Each support rod 501 has an action panel 502 fixedly installed at its end, and the action panel 502 is in contact with the silicone sleeve 542. A square frame 503 is also installed at one end of the support rod 501 inside the annular sleeve 56. A telescopic part 504 is provided between the square frame 503 and the extension shaft 58. The telescopic part 504 is fixedly connected to the end of the extension shaft 58, and one end of the telescopic part 504 is slidably connected to the square frame 503. It should be noted that the telescopic part 504 in this invention is composed of a sleeve, a telescopic end, and a spring. Since the above-mentioned telescopic part 504 is a prior art component, this invention will not describe it in detail.

[0023] In practical applications, after the strip undergoes back coating by the coating roller 3, it passes under the air distribution plate 5. The airflow within the air distribution plate 5 enters the air outlet channel 54 through the air inlet channel 53 and is then dispersed onto the coated surface of the strip through the outlet channel 54. This dispersed airflow directly acts on the coated surface of the strip to form an airflow layer, effectively slowing down the flow rate of the paint film and achieving a pre-curing effect. Simultaneously, the airflow generates an upward force, effectively preventing or avoiding sagging on the coated surface. When the airflow rate increases, the gas velocity within the air inlet channel 53 increases, causing the blades... The rotational speed of blade 50 will increase, and the gas will exert a force on the hollow sphere 59 that hinders its movement, causing the hollow sphere 59 to leave the end of the intake channel 53 and enter the exhaust channel 54. During this process, the extension shaft 58 will move synchronously with it, and the telescopic part 504 on the extension shaft 58 will move upward within the square frame 503. The rotation of blade 50 will cause the extension shaft 58 to rotate, and the rotation of the extension shaft 58 will cause the telescopic part 504 on it to rotate. During the rotation, the telescopic part 504 will exert a force on the square frame 503 under the action of centrifugal force. The support rod 501 causes the action panel 502 to apply force to the silicone sleeve 542. Multiple action panels 502 apply force to the silicone sleeve 542, causing the elastic metal sheet 541 to change, thus changing the aperture of the silicone sleeve 542. During this change, the elastic metal sheet 541 compresses the spring part 55. When the gas flow rate decreases, the compressed spring part 55 causes the elastic metal sheet 541 and the silicone sleeve 542 to return to their original position. If no gas flows into the intake channel 53, components such as the hollow sphere 59 and the extension shaft 58 will enter the airway under the influence of gravity. The resetting and descending motion, under the structural action of the present invention, can effectively adjust the size and speed of the air output. This design allows the airflow to act more precisely on the surface of the wet paint film, improving the pre-curing and anti-sagging effects. A scraper mechanism 12 is fixedly installed between the brackets 4. The scraper mechanism 12 scrapes off the paint surface that has been coated on the paint roller 3. Since the air distribution plate 5 emits airflow with a certain amount of heat upward, the paint on the paint roller 3 is prone to curing. Therefore, under the action of the scraper mechanism 12, the paint surface that has been coated on the paint roller 3 can be effectively scraped off, avoiding the curing and clumping of the coated paint surface.

[0024] To effectively improve the curing effect and reduce sagging, this invention heats the strip after passing through the air distribution plate 5 to accelerate the curing process of the coated topcoat film. A support frame 6 is provided on one side of the air distribution plate 5, and a heating mechanism 61 is installed inside the support frame 6. The heating mechanism 61 emits hot airflow to the back of the strip to heat the coated back of the strip. That is, the heating mechanism 61 is connected to another high-temperature air channel. Generally speaking, the airflow temperature from this air channel is between 50℃ and 70℃. In actual operation, it can be designed according to specific conditions to avoid the airflow temperature being too high or too low. A drive mechanism 7 is provided on the two supports 4 to drive the directional movement of the support frame 6. After the coated strip passes through the air distribution plate 5, the air distribution plate 5 pre-cures the coated surface by emitting airflow and inhibits sagging of the paint film. Then, under the action of the heating mechanism 61, the coated surface of the strip is heated and cured. As a further limitation of this invention, the drive mechanism 7 includes chain wheels 71 corresponding one-to-one with the two supports 4, and the chain wheels 71 are connected by rotating shafts 72. A servo motor 73 is fixedly mounted on the support 4. One end of the rotating shaft 72 is fixedly connected to the output end of the servo motor 73, and the ends of the other rotating shafts 72 are rotatably connected to the inner wall of the support 4. Multiple action plate frames 74 are also fixedly mounted on the chain wheels 71. The output end of the servo motor 73 drives the rotating shafts 72 to rotate, thereby making the chain wheels 71 rotate synchronously. The action plate frames 74 on them will then adjust their positions under the action of the chain wheels 71. Positioning sliders 62 are fixedly mounted at both ends of the support frame 6, and telescopic shafts 63 are mounted on the positioning sliders 62. Ball bearings are embedded at the ends of the telescopic shafts 63. Force-bearing shafts 64 are also mounted on the positioning sliders 62 and rotatably connected to them. The shaft 64 is located on the movement trajectory of the action plate frame 74. A positioning guide rail 41 is fixedly installed on the side wall of the bracket 4, and a sliding block 42 is slidably connected to the positioning guide rail 41. A constant force spring 43 connects the sliding block 42 and the positioning guide rail 41. A guide shaft 65 is installed on the positioning slider 62, and the guide shaft 65 is slidably connected to the sliding block 42. A return spring 66 connects the guide shaft 65 and the sliding block 42. A limit groove 44 is provided on the side wall of the bracket 4. The end of the telescopic shaft 63 slides within the limit groove 44. The limit groove 44 includes a straight-line area 45, an inclined downward area 46, a sliding area 47, and a straight upward area 48. Guide panels 49 are installed at the connection between the inclined downward area 46 and the sliding area 47, and between the straight upward area 48 and the straight-line area 45. One side of the guide panel 49 is an inclined surface, and the other side is a right-angled surface. Figure 11As shown, the guide panel 49 at the junction of the inclined descent area 46 and the sliding area 47 is inclined on one side of the inclined descent area 46 and right-angled on the other side of the sliding area 47; the guide panel 49 at the junction of the straight upward area 48 and the straight area 45 is inclined on one side of the straight upward area 48 and right-angled on the other side of the straight area 45.

[0025] Specifically, in practical applications, the conveyor belt after passing through the air distribution plate 5 will pass above the heating mechanism 61. The heating mechanism 61 heats and solidifies a portion of the conveyor belt directly above it. During this process, the output of the servo motor 73 drives the rotating shaft 72 to rotate, causing the chain wheel 71 to rotate synchronously. Consequently, the action plate frame 74 on it will apply a force to the force-bearing shaft 64 under the action of the chain wheel 71. This force-bearing shaft 64 then causes the positioning slider 62 to move in a directional direction, thus causing the heating mechanism 61 to move synchronously. It should be noted that the movement speed of the support frame 6 must be consistent with the movement speed of the conveyor belt. The positioning slider 62 moves synchronously with the support frame 6. During the process, the telescopic shaft 63 on its side wall first moves along the trajectory of the straight section 45, and the positioning slider 62, under the action of the guide shaft 65, causes the sliding block 42 to move synchronously on the positioning guide rail 41. During the movement, the positioning slider 62 stretches the constant force spring 43. When the telescopic shaft 63 moves from the straight section 45 to the inclined downward section, the positioning slider 62 drives the support frame 6 to move downward. Under the action of the guide shaft 65, the positioning slider 62 moves towards the sliding block 42, causing the return spring 66 to be in a stretched state. This increases the distance between the heating mechanism 61 and the coating surface of the strip, preventing the paint from cracking due to high-temperature airflow. When the telescopic shaft 63 enters the sliding area 47 along the downward inclined region, it will pass the inclined surface of the guide panel 49. At this time, one of the action plate frames 74, which is in contact with the force-bearing shaft 64, will move to the semi-circular chain of the chain wheel 71, and then the force-bearing shaft 64 will separate from the action plate frame 74. After the action plate frame 74 separates from the force-bearing shaft 64, the positioning slider 62 will be reset under the action of the constant force spring 43. During the reset process, the telescopic shaft 63 will move along the trajectory of the sliding area 47. When it moves to the intersection of the straight upward region 48 and the sliding area 47, the telescopic shaft 63 will move along the straight upward region 48 under the action of the reset spring 66. The track in the upward region 48 moves upward. During this process, the telescopic shaft 63 enters the straight region 45 along the inclined surface of the guide panel 49. During this process, the support frame 6, heating mechanism 61 and other components move synchronously to reset. When the heating mechanism 61 returns to its initial position, it can heat and cure the area of ​​the plate strip coated with paint, ensuring that the heating mechanism 61 can heat and cure the coated surface of the plate strip. Through the structural design of the present invention, the heating mechanism 61 moves synchronously with the plate strip, which can ensure that the plate strip is immediately and uniformly heated after coating, thereby accelerating the curing process of the paint film and effectively suppressing the dripping phenomenon of wet paint film under the action of gravity, so as to improve the quality of the plate strip coating surface.

[0026] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0027] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A three-roller precision back coating machine for a color coating production line, characterized in that: The system includes a frame (1), a paint roller (2), and a paint roller (3). The frame (1) is fixedly mounted with brackets (4) on both sides. A uniform air plate (5) is installed between the two brackets (4) to dissipate airflow to the back of the strip. The uniform air plate (5) is provided with multiple air holes (51) at equal intervals. Each air hole (51) is equipped with an air outlet (52). A support frame (6) is provided on one side of the uniform air plate (5). A heating mechanism (61) is installed inside the support frame (6). The heating mechanism (61) dissipates hot airflow to the back of the strip to heat the back of the coating. A drive mechanism (7) is provided on the two brackets (4) to drive the support frame (6) to move in a directional manner. The coated strip passes through the uniform air plate (5). The uniform air plate (5) dissipates airflow through the air outlet (52). The airflow pre-cures the strip to suppress sagging. Then, the coating surface of the strip is heated and cured by the heating mechanism (61).

2. The three-roller precision back coating machine for a color coating production line according to claim 1, characterized in that: The air outlet (52) includes an air inlet channel (53) and an air outlet channel (54) installed inside the air vent (51). The air outlet channel (54) includes multiple elastic metal sheets (541) connected to the end of the air inlet channel (53) and silicone sleeves (542) sleeved on the multiple elastic metal sheets (541). The silicone sleeves (542) are subjected to force to change the aperture. Multiple spring parts (55) are installed on the inner wall of the air vent (51), and the spring parts (55) are in contact with the elastic metal sheets (541).

3. The three-roller precision back coating machine for a color coating production line according to claim 2, characterized in that: An annular sleeve (56) is also provided inside the air outlet channel (54), and the annular sleeve (56) is connected to the air distribution plate (5) by a fixed rod (57). The annular sleeve (56) and the fixed rod (57) are rotatably connected. An extension shaft (58) is also installed inside the annular sleeve (56), and the end of the extension shaft (58) penetrates the inner wall of the annular sleeve (56) and extends into the air inlet channel (53). A hollow sphere (59) is installed on the extension shaft (58), and a blade (50) is fixedly installed at one end of the extension shaft (58) located in the air inlet channel (53).

4. A three-roll precision back coating machine for a color coating production line according to claim 2, characterized in that: The diameter of the exhaust channel (54) is larger than the diameter of the intake channel (53).

5. A three-roller precision back coating machine for a color coating production line according to claim 3, characterized in that: The annular sleeve (56) is equipped with a plurality of support rods (501) that are slidably connected to its inner wall. Each support rod (501) has a function panel (502) fixedly installed at its end, and the function panel (502) is in contact with the silicone sleeve (542). A square frame (503) is also installed at one end of the support rod (501) inside the annular sleeve (56). A telescopic part (504) is provided between the square frame (503) and the extension shaft (58). The telescopic part (504) is fixedly connected to the end of the extension shaft (58), and one end of the telescopic part (504) is slidably connected to the square frame (503).

6. A three-roller precision back coating machine for a color coating production line according to claim 1, characterized in that: The drive mechanism (7) includes chain wheels (71) corresponding to two supports (4) one by one, and the chain wheels (71) are connected by rotating shafts (72). A servo motor (73) is fixedly installed on the support (4). One end of the rotating shaft (72) is fixedly connected to the output end of the servo motor (73), and the ends of the other rotating shafts (72) are rotatably connected to the inner wall of the support (4). Multiple action plate frames (74) are also fixedly installed on the chain wheels (71).

7. A three-roller precision back coating machine for a color coating production line according to claim 6, characterized in that: The support frame (6) is fixedly installed with positioning sliders (62) at both ends, and a telescopic shaft (63) is installed on the positioning slider (62). A ball bearing is embedded at the end of the telescopic shaft (63). A force-bearing shaft (64) is also installed on the positioning slider (62) and rotates therewith. The force-bearing shaft (64) is located on the movement trajectory of the action plate frame (74).

8. A three-roller precision back coating machine for a color coating production line according to claim 7, characterized in that: The bracket (4) is also fixedly installed with a positioning guide rail (41), and a sliding block (42) is installed on the positioning guide rail (41) and slidably connected thereto. A constant force spring (43) is connected between the sliding block (42) and the positioning guide rail (41). A guide shaft (65) is installed on the positioning slider (62), and the guide shaft (65) is slidably connected to the sliding block (42). A reset spring (66) is also connected between the guide shaft (65) and the sliding block (42).

9. A three-roller precision back coating machine for a color coating production line according to claim 8, characterized in that: The side wall of the bracket (4) is provided with a limiting groove (44), and the end of the telescopic shaft (63) slides within the limiting groove (44). The limiting groove (44) includes a straight area (45), an inclined downward area (46), a sliding area (47), and a straight upward area (48).

10. A three-roll precision back coating machine for a color coating production line according to claim 9, characterized in that: Guide panels (49) are installed at the junction of the inclined descent area (46) and the sliding area (47) and between the straight upward area (48) and the straight area (45). One side of the guide panel (49) is an inclined surface and the other side is a right angle surface.

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