Three-roller precision back coater for color coating production line

Abstract

The present application relates to the technical field of color coating equipment, and discloses a three-roller precision back coating machine for a color coating production line, which comprises a rack, a paint lifting roller and a paint coating roller, supports are fixedly installed on both sides of the rack, a gas distribution plate for emitting airflow to the back of the plate strip is installed between the two supports, a plurality of air holes are equidistantly arranged on the gas distribution plate, an air outlet is installed in each air hole, a support frame is arranged on one side of the gas distribution plate, a heating mechanism is installed in the support frame, drive mechanisms for driving the directional movement of the support frame are arranged on the two supports, and the three-roller precision back coating machine for the color coating production line can emit airflow to the back of the plate strip through the gas distribution plate, the plurality of air holes and the air outlet, so as to form an air flow layer, the air flow layer effectively slows down the flow speed of the paint in the wet paint film, the airflow generates upward force on the surface of the wet paint film, and the occurrence of the sagging phenomenon is significantly inhibited in combination with the viscosity between the paint surface and the plate strip.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of color coating equipment, in particular to a three-roller precision back coating machine for color coating production line. BACKGROUND

[0002] The three-roller precision back coating machine for color coating production line is a core equipment applied to the surface coating of continuous coiled material (such as metal plate strip and plastic film), and its core function is to uniformly transfer paint or functional coating to the back of the plate strip (i.e. the downward face contacting with the equipment) through the synergistic effect of the coating roller, the metering roller and the strip roller. In a typical three-roller structure, the coating roller is responsible for directly transferring the coating to the plate strip surface, the metering roller adjusts the coating thickness through the gap, and the strip roller draws the coating from the paint pan and transfers it to the coating roller. According to the driving mode, it can be divided into collective driving and single roller driving. The former relies on a single motor to control all rollers, and the process adjustment is limited. The latter uses independent motors to drive each roller, which can flexibly adjust the speed and direction, and is more suitable for high-precision coating requirements.

[0003] In the actual work process, the plate strip is pulled horizontally by the traction mechanism, the coating roller is located below the plate strip and rotates counterclockwise (reverse coating process), the coating carried by the roller surface contacts the back of the plate strip and completes the coating, and the coated plate strip continues to move forward. At this time, the painted surface is downward to the curing area. Although the three-roller precision back coating machine is superior to the two-roller system in coating precision, in the actual working process, due to the painted surface of the plate strip facing downward, the uncured wet paint film is prone to sagging under the action of gravity, resulting in uneven coating thickness, dripping and other conditions. The existing scheme mainly relies on paint formula optimization (such as thickener addition) or reduces the line speed to alleviate sagging, but the former sacrifices the flowability of the coating, and the latter reduces the production efficiency. Therefore, we propose a three-roller precision back coating machine for color coating production line. SUMMARY

[0004] The present application relates to the technical field of color coating equipment, in particular to a three-roller precision back coating machine for color coating production line.

[0005] In order to achieve the above object, the present application provides the following technical scheme: A three-roll precision back coating machine for color coating production line, comprising a rack, a paint lifting roller and a paint coating roller, the rack is fixedly installed with a support on both sides, a gas distribution plate for emitting airflow to the back of the plate strip is installed between the two supports, a plurality of air holes are equidistantly arranged on the gas distribution plate, an air outlet is installed inside each air hole, a support frame is arranged on one side of the gas distribution plate, a heating mechanism is installed inside the support frame, the heating mechanism emits hot airflow to the back of the plate strip to heat the back of the plate strip, a driving mechanism for driving the directional movement of the support frame is arranged on the two supports, the plate strip after coating passes through the gas distribution plate, the gas distribution plate emits airflow through the air outlet to pre-solidify by airflow to inhibit sagging, and then the plate strip coating surface is heated and solidified under the action of the heating mechanism.

[0006] Preferably, the air outlet comprises an air inlet channel and an air outlet channel installed inside the air hole, the air outlet channel comprises a plurality of elastic metal sheets connected with the end of the air inlet channel and a silica gel sleeve sleeved on the plurality of elastic metal sheets, the silica gel sleeve changes the pore size under the action of force, and a plurality of spring portions are installed on the inner wall of the air hole and in contact with the elastic metal sheets.

[0007] Preferably, an annular sleeve is further arranged inside the air outlet channel, the annular sleeve is connected with the gas distribution plate through a fixed rod frame, the annular sleeve is rotatably connected with the fixed rod frame, an extension shaft body is further installed inside the annular sleeve, the end of the extension shaft body penetrates through the inner wall of the annular sleeve and extends into the air inlet channel, a hollow ball is installed on the extension shaft body, and a blade is further fixedly installed on the end of the extension shaft body inside the air inlet channel.

[0008] Preferably, the pore size of the air outlet channel is larger than that of the air inlet channel.

[0009] Preferably, a plurality of support rod frames are slidably connected with the inner wall of the annular sleeve, an acting surface plate is fixedly installed on the end of each support rod frame, the acting surface plate is in contact with the silica gel sleeve, a square frame is further installed on the end of the support rod frame inside the annular sleeve, a telescopic portion is arranged between the square frame and the extension shaft body, the telescopic portion is fixedly connected with the end of the extension shaft body, and the end of the telescopic portion is slidably connected with the square frame.

[0010] Preferably, the driving mechanism comprises chain wheels corresponding to the two supports one by one, the chain wheels are connected through rotating shaft bodies, a servo motor is fixedly installed on the support, the end of one of the rotating shaft bodies is fixedly connected with the output end of the servo motor, the ends of the remaining rotating shaft bodies are rotatably connected with the inner wall of the support, and a plurality of acting plate frames are further fixedly installed on the chain wheels.

[0011] Preferably, the support frame body is fixedly provided with positioning sliding blocks at both ends, and telescopic shaft bodies are mounted on the positioning sliding blocks, and the ends of the telescopic shaft bodies are embedded with rolling balls, wherein a stress shaft body is further mounted on the positioning sliding block and rotationally connected thereto, and the stress shaft body is located on the movement track of the action plate frame.

[0012] Preferably, the support frame side wall is further fixedly provided with a positioning guide rail, and a sliding block body is slidably connected to the positioning guide rail, wherein a constant force spring is connected between the sliding block body and the positioning guide rail, a guide shaft body is mounted on the positioning sliding block, and the guide shaft body is slidably connected to the sliding block body, and a return spring is further connected between the guide shaft body and the sliding block body.

[0013] Preferably, the support frame side wall is provided with a limiting groove body, and the end of the telescopic shaft body is limitedly slid in the limiting groove body, and the limiting groove body comprises a straight running area, an inclined descending area, a sliding area and a straight running upward area.

[0014] Preferably, a guide panel is mounted at the communication between the inclined descending area and the sliding area and between the straight running upward area and the straight running area, and one side of the guide panel is an inclined surface, and the other side is a right-angled surface.

[0015] Compared with the prior art, the present application has the following advantages:

[0016] 1. The air flow layer formed by the air flow plate, the plurality of air holes and the air outlet can effectively slow down the flow speed of the paint in the wet paint film, and the upward force of the air flow on the surface of the wet paint film, combined with the viscosity between the paint surface and the plate belt, can significantly inhibit the occurrence of the sagging phenomenon and improve the coating quality. The air outlet channel can be self-adjusted according to the air volume of the air duct to ensure that the air flow can uniformly and stably act on the coating surface of the plate belt, improve the pre-curing effect, and avoid the problem of uneven pre-curing caused by air flow variation.

[0017] 2. The support frame body and the heating mechanism are arranged on one side of the air flow plate, and the driving mechanism drives the support frame body to move directionally, so that the heating mechanism can move synchronously with the plate belt. This design ensures that the plate belt is immediately subjected to uniform heating after coating, accelerates the curing process of the paint film, further inhibits the sagging phenomenon, and improves the production efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0019] Figure 2 It is a schematic diagram of the structure of the present application;

[0020] Figure 3 It is the internal structure schematic view of the support of the present application;

[0021] Figure 4 It is the internal structure schematic view of the gas distribution plate and heating mechanism in the rack of the present application;

[0022] Figure 5 It is the structure schematic view of the gas distribution plate of the present application;

[0023] Figure 6 It is the internal structure schematic view of the air hole of the present application;

[0024] Figure 7 It is the internal structure schematic view of the air inlet channel and air outlet channel in the air hole of the present application;

[0025] Figure 8 It is the structure schematic view of the air outlet channel of the present application;

[0026] Figure 9 It is the structure schematic view of the annular sleeve of the present application;

[0027] Figure 10 It is the structure schematic view of the support frame of the present application;

[0028] Figure 11 It is the structure schematic view of the side wall of the support of the present application;

[0029] Figure 12 It is the internal partial structure schematic view of the support of the present application.

[0030] In the figure: 1, rack; 2, paint lifting roller; 3, paint coating roller; 4, support; 41, positioning guide rail; 42, sliding block body; 43, constant force spring; 44, limiting groove body; 45, straight running area; 46, inclined descending area; 47, sliding area; 48, straight running upward area; 49, guide panel; 5, gas distribution plate; 51, air hole; 52, air outlet; 53, air inlet channel; 54, air outlet channel; 541, elastic metal sheet; 542, silica gel sleeve; 55, spring part; 56, annular sleeve; 57, fixed rod frame; 58, extension shaft body; 59, hollow ball body; 50, blade; 501, support rod frame; 502, action panel; 503, square frame; 504, telescopic part; 6, support frame; 61, heating mechanism; 62, positioning sliding block; 63, telescopic shaft body; 64, force receiving shaft body; 65, guide shaft body; 66, return spring; 7, driving mechanism; 71, chain wheel; 72, rotating shaft body; 73, servo motor; 74, action frame; 8, support roller; 9, first coating roller; 10, second coating roller; 11, third coating roller; 12, doctor mechanism. DETAILED DESCRIPTION

[0031] 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.

[0032] 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 2 As 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.

[0033] If the back of the plate strip is coated, then the paint is brought to the surface of the roller by the rotation of the paint lifting roller 2, and then contacts the paint coating roller 3, the gap between the paint coating roller 3 and the paint lifting roller 2 forms a paint film, and the paint coating roller 3 transfers the paint film to the back of the plate strip. In actual operation, during the coating of the back of the plate strip, the coating surface faces downward, and the sagging phenomenon is prone to occur due to the action of gravity. Therefore, the present application is designed as follows: supports 4 are fixedly installed on both sides of the rack 1, and a uniform air plate 5 is fixedly installed between the side walls of the two supports 4, wherein the uniform air plate 5 emits air flow to the back of the plate strip, and the uniform air plate 5 is close to the paint coating roller 3. It should be noted that the uniform air plate 5 in the present application is in communication with an air duct, which is actually a pipeline for conveying air flow. Since the pipeline for conveying air flow is a common technical means in the art, the present application does not describe it in detail. The air duct conveys air flow with a certain temperature into the uniform air plate 5. Normally, the temperature of the air flow entering the uniform air plate 5 is usually 35-40°C. A plurality of air holes 51 are equidistantly arranged on the uniform air plate 5, and an air outlet portion 52 is installed in each air hole 51. In actual application, the plate strip is usually coated with paint with different properties according to the working conditions during coating, and the coating thickness, paint viscosity and other properties are different. Therefore, the air flow rate will change. In order to improve the pre-solidification effect of the air flow on the coating layer, the air outlet portion 52 in the present application can adjust the size of the hole diameter according to the air flow rate of the air duct. Therefore, when the uniform air plate 5 emits air flow, it can directly act on the coating surface of the plate strip, i.e. the surface of the wet paint film, to form an air flow layer. This air flow layer can slow down the flow speed of the paint inside the wet paint film, thereby achieving a pre-solidification effect to a certain extent. Under the action of the emitted air flow, the air flow can generate an upward force on the surface of the wet paint film. Combined with the viscosity between the paint surface and the plate strip, the occurrence of sagging phenomenon can be effectively inhibited.

[0034] Combining the drawings Figure 7 and the drawings Figure 8 As further limited in the present application, the air outlet portion 52 includes an air inlet channel 53 and an air outlet channel 54 installed in the air hole 51, wherein the hole 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 end of the air inlet channel 53 and a silica gel sleeve 542 sleeved on the plurality of elastic metal sheets 541, the silica gel sleeve 542 is subjected to a force to change the hole diameter, and a plurality of spring portions 55 are installed on the inner wall of the air hole 51 and in contact with the elastic metal sheets 541. Therefore, when a force is applied to the silica gel sleeve 542, the silica gel sleeve 542 changes the elastic metal sheets 541. It should be noted that the silica gel sleeve 542 and the elastic metal sheets 541 are made of a material with a small elastic coefficient. In actual application, the air flow rate of the air duct can be selected. The elastic metal sheets 541 can also be made of other elastic materials.

[0035] Combination of the drawings Figure 5 Combination of the drawings Figure 6 Combination of the drawings Figure 9 As shown in the drawings, the annular sleeve 56 is arranged inside the air outlet channel 54, and the annular sleeve 56 and the air uniformizing plate 5 are connected through the fixed rod frame 57, the annular sleeve 56 is rotationally connected with the fixed rod frame 57, the extension shaft body 58 is arranged inside the annular sleeve 56, the end of the extension shaft body 58 penetrates the inner wall of the annular sleeve 56 and extends into the air inlet channel 53, the hollow sphere 59 is arranged on the extension shaft body 58, the hollow sphere 59 is located at the air outlet end of the air inlet channel 53, the outer diameter of the hollow sphere 59 is close to the inner diameter of the air inlet channel 53, the blade 50 is fixedly arranged at one end of the extension shaft body 58 located in the air inlet channel 53, the airflow in the air inlet channel 53 exerts force on the blade 50 in the rising process, and the rotating speed of the blade 50 can effectively reflect the ventilation volume, if the ventilation volume is large, since the aperture of the air inlet channel 53 is a constant value, according to the formula Q=AV (A is the cross-sectional area of the air inlet channel 53, Q represents the flow rate, and V represents the flow rate), when the flow rate increases, the flow rate of the gas in the air inlet channel 53 will increase, in order to avoid the flow rate being too fast to affect the coating surface, the aperture of the air outlet channel 54 is changed to effectively form a uniform and stable airflow field, and it is ensured that the entire plate coating surface can be uniformly affected by the airflow; a plurality of support rod frames 501 in sliding connection with the inner wall of the annular sleeve 56 are arranged inside the annular sleeve 56, the end of each support rod frame 501 is fixedly provided with an action surface plate 502, the action surface plate 502 is in contact with the silica gel sleeve 542, the one end of the support rod frame 501 located inside the annular sleeve 56 is further provided with a square frame 503, the square frame 503 and the extension shaft body 58 are provided with the telescopic part 504, the telescopic part 504 is fixedly connected with the end of the extension shaft body 58, and the telescopic part 504 is in sliding connection with the square frame 503, it should be noted that the telescopic part 504 in the application is composed of a sleeve, a telescopic end and a spring, since the telescopic part 504 is a prior art component, the application does not make too much description.

[0036] In actual application process, after the plate strip is coated on the back by the paint roller 3, it will pass below the air uniformizing plate 5, and the airflow in the air uniformizing plate 5 will enter the air outlet channel 54 from the air inlet channel 53, and then be emitted to the plate strip coating surface through the outlet of the air outlet channel 54, and the emitted airflow will directly act on the plate strip coating surface to form an air flow layer, so as to effectively slow down the flow speed of the paint inside the paint film, and play a pre-curing effect, and the airflow will generate an upward force, which can effectively prevent or avoid the occurrence of sagging on the coating surface; when the airflow increases, the rotation speed of the blade 50 will increase due to the increase of the airflow speed in the air inlet channel 53, and the gas will exert a force on the hollow sphere 59 to hinder its movement, so that the hollow sphere 59 leaves the end of the air inlet channel 53 and enters the air outlet channel 54, and in this process, the extension shaft body 58 will move synchronously, and the telescopic part 504 on the extension shaft body 58 will move upward in the square frame 503, and the rotation of the blade 50 will make the extension shaft body 58 rotate, and the rotation of the extension shaft body 58 will make the telescopic part 504 on it rotate, and the telescopic part 504 will exert a force on the square frame 503 under the action of centrifugal force in the rotation process, and the square frame 503 will make the action surface plate 502 exert a force on the silica gel sleeve 542 through the support rod frame 501, and multiple action surface plates 502 will exert a force on the silica gel sleeve 542, and the silica gel sleeve 542 will change the elastic metal sheet 541, and then the pore size of the silica gel sleeve 542 will change accordingly, and in the changing process, the elastic metal sheet 541 will be pressed against the spring part 55, and when the airflow decreases, the elastic metal sheet 541 and the silica gel sleeve 542 will move back to the original position under the action of the compressed spring part 55, and when there is no gas in the air inlet channel 53, the hollow sphere 59, the extension shaft body 58 and other components will move back to the original position under the action of gravity, and thus the size and speed of the air outlet can be effectively adjusted under the structure of the present application, and the design makes the airflow more accurately act on the wet paint film surface, improves the pre-curing and sagging inhibition effect, and the scraper mechanism 12 is fixedly installed between the supports 4, and the scraper mechanism 12 can scrape the paint on the paint roller 3, and since the air uniformizing plate 5 emits the airflow with a certain amount of heat upward, the paint on the paint roller 3 is prone to solidification, and thus the scraper mechanism 12 can effectively scrape the paint on the paint roller 3, and avoid the solidification and caking of the coated paint surface.

[0037] In order to effectively improve the curing effect and reduce the occurrence of sagging phenomenon, the plate strip after the air distribution plate 5 is heated, the curing process of the coating finish film is accelerated by heating, and the support frame 6 is provided on one side of the air distribution plate 5, and the heating mechanism 61 is installed in the support frame 6. The heating mechanism 61 emits hot air flow to the back of the plate strip to heat the back of the plate strip, that is, the heating mechanism 61 is communicated with another high-temperature air duct. Generally, the temperature of the air flow flowing out of the air duct is 50-70℃. In actual operation, it can be designed according to the specific situation to avoid that the temperature of the air flow is too high or too low. Drive mechanism 7 is arranged on the two supports 4 for driving the directional motion of the support frame 6. The plate strip after coating passes through the air distribution plate 5. The air distribution plate 5 is pre-cured by emitting air flow to the coating surface and inhibits the occurrence of sagging phenomenon of the paint film. Then, under the action of the heating mechanism 61, the coating surface of the plate strip is heated and cured.

[0038] As a further limitation in the present application, the drive mechanism 7 includes a chain wheel 71 corresponding to the two supports 4, and the chain wheels 71 are connected by rotating shaft bodies 72. A servo motor 73 is fixedly installed on the support 4. One end of the rotating shaft body 72 is fixedly connected with the output end of the servo motor 73, and the other ends of the rotating shaft bodies 72 are rotatably connected with the inner wall of the support 4. A plurality of action plate frames 74 are also fixedly installed on the chain wheel 71. The output end of the servo motor 73 drives the rotating shaft body 72 to rotate, so that the chain wheel 71 rotates synchronously, and the action plate frame 74 on it adjusts the position under the action of the chain wheel 71. The ends of the support frame 6 are fixedly installed with positioning sliding blocks 62, and telescopic shaft bodies 63 are installed on the positioning sliding blocks 62. The ends of the telescopic shaft bodies 63 are embedded with balls. The positioning sliding blocks 62 are also installed with force receiving shaft bodies 64 which are rotatably connected with the positioning sliding blocks 62. The force receiving shaft bodies 64 are located on the movement track of the action plate frame 74. The side wall of the support 4 is also fixedly installed with a positioning guide rail 41, and a sliding block body 42 is installed on the positioning guide rail 41 and is slidably connected with the positioning guide rail 41. A constant force spring 43 is connected between the sliding block body 42 and the positioning guide rail 41. A guide shaft body 65 is installed on the positioning sliding block 62 and is slidably connected with the sliding block body 42. A return spring 66 is also connected between the guide shaft body 65 and the sliding block body 42. Limiting grooves 44 are provided on the side wall of the support 4. The ends of the telescopic shaft bodies 63 are limitingly slid in the limiting grooves 44. The limiting grooves 44 include straight running areas 45, inclined descending areas 46, sliding areas 47 and straight running upward areas 48. Guide panels 49 are installed at the communication parts between the inclined descending areas 46 and the sliding areas 47 and between the straight running upward areas 48 and the straight running areas 45. One side of the guide panel 49 is an inclined surface, and the other side is a right-angle surface. The combination of the drawings Figure 11As shown, the guide panel 49 at the communication between the inclined descending region 46 and the sliding region 47 is inclined on one side of the inclined descending region 46 and is right-angled on the other side of the sliding region 47; the guide panel 49 at the communication between the straight ascending region 48 and the straight region 45 is inclined on one side of the straight ascending region 48 and is right-angled on the other side of the straight region 45.

[0039] Specifically, in actual application, the plate strip after the uniform gas plate 5 will pass above the heating mechanism 61, and the heating mechanism 61 will heat and solidify the plate strip in the area above it. In this process, the servo motor 73 drives the rotating shaft 72 to rotate, so that the chain wheel 71 rotates synchronously, and then the action plate frame 74 on it will exert force on the stressed shaft 64 under the action of the chain wheel 71, and then the stressed shaft 64 will drive the positioning sliding block 62 and the support frame 6 to move directionally, so that the heating mechanism 61 moves synchronously. It should be noted that the movement speed of the support frame 6 and the movement speed of the plate strip should be consistent. During the movement of the positioning sliding block 62, the telescopic shaft 63 of the side wall first moves along the track of the straight area 45, and the positioning sliding block 62 moves synchronously on the positioning guide rail 41 under the action of the guide shaft 65. During the movement, the positioning sliding block 62 stretches the constant force spring 43. When the telescopic shaft 63 moves from the straight area 45 to the downward inclined area, the positioning sliding block 62 drives the support frame 6 to move downward, and the positioning sliding block 62 moves to the sliding block 42 under the action of the guide shaft 65, and the return spring 66 is in a stretched state, so that the distance between the heating mechanism 61 and the coated surface of the plate strip increases, avoiding the high-temperature gas flow causing the paint surface to crack. When the telescopic shaft 63 enters the sliding area 47 along the downward inclined area, the telescopic shaft 63 will pass through the inclined surface of the guide panel 49, and at this time one of the action plate frames 74 in contact with the stressed shaft 64 will move to the semicircular chain of the chain wheel 71, and then the stressed shaft 64 will be separated from the action plate frame 74. After the action plate frame 74 is separated from the stressed shaft 64, the positioning sliding block 62 will move back under the action of the constant force spring 43. During the resetting process of the positioning sliding block 62, the telescopic shaft 63 moves along the track of the sliding area 47, and when it moves to the intersection of the straight upward area 48 and the sliding area 47, the telescopic shaft 63 moves upward along the track of the straight upward area 48 under the action of the return spring 66. In this process, the telescopic shaft 63 enters the straight area 45 along the inclined surface of the guide panel 49. In this process, the support frame 6, the heating mechanism 61 and other components move back synchronously. When the heating mechanism 61 returns to the initial position, it can heat and solidify the next painted area of the plate strip, ensuring that the heating mechanism 61 can heat and solidify the coated surface of the plate strip. Through the structural design of the present application, the heating mechanism 61 and the plate strip move synchronously, which can ensure that the plate strip is immediately and uniformly heated after coating, thereby accelerating the curing process of the paint film, effectively preventing the wet paint film from flowing under the action of gravity, and improving the quality of the coated surface of the plate strip.

[0040] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting; it is not intended to exclude myriad other embodiments of the present application that other inventors can develop based on the same general inventive concepts embodied by the described embodiments. That is, although the present application is described in terms of particular embodiments and implementations, it is to be understood that the terminology used is for the purpose of descriptive clarity and that it should be taken in its broadest possible sense. For example, the terms "a", "an", and "the" include both singular and plural referents unless the context clearly dictates otherwise. The terms "comprises", "comprising", "includes", "including" and the like can be used in conjunction with the term "consisting of to include the elements or steps listed after such conjunctive language, but not to the exclusion of other elements or steps. The singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise.

[0041] While the embodiments of the application have been shown and described herein, it is to be understood that the application is not limited to these embodiments. Rather, many modifications, changes and substitutions are intended to fall within the scope of the present application, which is limited only by the scope of the claims hereinafter appended.

Claims

1. A three-roll finishing back coater for a color-coated production line, characterized in that: The utility model provides a painting device, including frame (1), lift paint roller (2) and paint roller (3), both sides of frame (1) are fixedly installed with support (4), install the air uniform plate (5) of emitting air current to the back of plate belt between two support (4), a plurality of air holes (51) are arranged equidistantly on air uniform plate (5), install the air outlet portion (52) in every air hole (51) inside, and set up support frame (6) on air uniform plate (5) one side, and install heating mechanism (61) in support frame (6) inside, heating mechanism (61) emits hot air current to the back of plate belt, to plate belt coating back heating, and set up drive mechanism (7) on two support (4) for driving support frame (6) directional motion, the plate belt of coating end passes through air uniform plate (5), air uniform plate (5) emits air current through air outlet portion (52), pre-solidification through air current to inhibit sagging, then under the action of heating mechanism (61) to plate belt coating surface heating solidification.

2. The three-roll calender for a color-coated production line according to claim 1, characterized in that: The air outlet portion (52) includes an air inlet channel (53) and an air outlet channel (54) installed inside the air hole (51), the air outlet channel (54) includes a plurality of elastic metal sheets (541) connected to the end of the air inlet channel (53) and a silica gel sleeve (542) sleeved on the plurality of elastic metal sheets (541), the silica gel sleeve (542) changes the pore size under the action force, and a plurality of spring portions (55) are installed on the inner wall of the air hole (51), and the spring portions (55) are in contact with the elastic metal sheets (541).

3. The three-roll calender for a color-coated production line according to claim 2, characterized in that: The air outlet channel (54) is further provided with an annular sleeve (56), and the annular sleeve (56) and the air uniform plate (5) are connected through a fixed rod frame (57), the annular sleeve (56) is rotationally connected with the fixed rod frame (57), the annular sleeve (56) is further provided with an extension shaft body (58) installed inside, one end of the extension shaft body (58) penetrates the inner wall of the annular sleeve (56) and extends into the air inlet channel (53), and a hollow ball (59) is installed on the extension shaft body (58), and a blade (50) is further fixedly installed on one end of the extension shaft body (58) located in the air inlet channel (53).

4. The three-roll calender for a color-coated production line according to claim 2, characterized in that: The pore size of the air outlet channel (54) is larger than the pore size of the air inlet channel (53).

5. The three-roll calender for a color-coated production line according to claim 3, characterized in that: A plurality of support rod frames (501) are installed inside the annular sleeve (56) and are in sliding connection with the inner wall of the annular sleeve (56), an acting surface plate (502) is fixedly installed at one end of each support rod frame (501), the acting surface plate (502) is in contact with the silica gel sleeve (542), a square frame (503) is further installed at one end of the support rod frame (501) located in the annular sleeve (56), a telescopic portion (504) is arranged between the square frame (503) and the extension shaft body (58), the telescopic portion (504) is fixedly connected with the end of the extension shaft body (58), and one end of the telescopic portion (504) is in sliding connection with the square frame (503).

6. The three-roll calender for a color-coated production line according to claim 1, characterized in that: The driving mechanism (7) comprises a chain wheel (71) corresponding to each of the two supports (4), and the chain wheels (71) are connected through rotating shaft bodies (72), and a servo motor (73) is fixedly installed on the support (4), one end of one of the rotating shaft bodies (72) is fixedly connected with the output end of the servo motor (73), and the other ends of the remaining rotating shaft bodies (72) are rotatably connected with the inner wall of the support (4), and a plurality of action plate frames (74) are also fixedly installed on the chain wheel (71).

7. The three-roll calender for a color-coated production line according to claim 6, characterized in that: Both ends of the support frame (6) are fixedly installed with a positioning sliding block (62), and a telescopic shaft body (63) is installed on the positioning sliding block (62), and the end of the telescopic shaft body (63) is embedded with a ball, wherein a force receiving shaft body (64) rotatably connected with the positioning sliding block (62) is also installed on the positioning sliding block (62), and the force receiving shaft body (64) is located on the movement track of the action plate frame (74).

8. The three-roll calender for a color-coated production line according to claim 7, characterized in that: The side wall of the support (4) is also fixedly installed with a positioning guide rail (41), and a sliding block body (42) in sliding connection with the positioning guide rail (41) is installed on the positioning guide rail (41), wherein a constant force spring (43) is connected between the sliding block body (42) and the positioning guide rail (41), a guide shaft body (65) is installed on the positioning sliding block (62), and the guide shaft body (65) is in sliding connection with the sliding block body (42), and a return spring (66) is also connected between the guide shaft body (65) and the sliding block body (42).

9. The three-roll calender for a color-coated production line according to claim 8, characterized in that: The side wall of the support (4) is provided with a limiting groove body (44), the end of the telescopic shaft body (63) is limitedly slid in the limiting groove body (44), and the limiting groove body (44) comprises a straight running area (45), an inclined descending area (46), a sliding area (47) and a straight running upward area (48).

10. The three-roll calender for a color-coated production line according to claim 9, characterized in that: The inclined descending area (46) and the sliding area (47) are communicated, and the straight running upward area (48) and the straight running area (45) are both installed with a guide panel (49), one side of the guide panel (49) is an inclined surface, and the other side is a right-angle surface.

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