Pre-coating device and coating equipment

Abstract

The utility model relates to the technical field of coating equipment, in particular to a pre-coating device and coating equipment. The pre-coating device provided by the utility model comprises a pre-coating roller assembly and a hydrophilic enhancement processing module, the pre-coating roller assembly comprises a pre-coating roller, the hydrophilicity enhancing treatment module is arranged on the peripheral side of the pre-coating roller, and the hydrophilicity enhancing treatment module enhances the hydrophilicity of the surface area of the pre-coating roller by conducting hydrophilicity enhancing treatment on the surface area of the pre-coating roller before the surface area of the pre-coating roller is taken out of the non-uniform coating in the coating die head. According to the present invention, the hydrophilic coating material is more easily attached to the surface area of the pre-coating roller, and the pre-coating roller rotates so as to make the surface area of the pre-coating roller be treated by the hydrophilic enhancement treatment module, and pass through the lip of the coating die head, such that the rapid formation of the liquid curtain is easily achieved so as to rapidly bring out the non-uniform coating material in the coating die head, the pre-coating time is reduced, and the waste of the slurry is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to coating equipment technical field especially is related to a kind of pre-coating device and coating equipment. BACKGROUND

[0002] Perovskite solar cell production is by coating device on substrate to form perovskite film layer with perovskite solution, and the uniformity of perovskite solution coating will affect the photoelectric conversion efficiency of perovskite solar cell. The perovskite solution extruded by coating die head is not uniform at the beginning, and it needs to be pre-coated before coating the substrate to ensure uniform coating. In the prior art, the coating die head pre-coats the pre-coating roller assembly. Since the surface of the pre-coating roller is not ideal in terms of hydrophilicity, it is not conducive to the formation of a uniform liquid curtain on the surface of the pre-coating roller for water-based coating paste, so that the uneven paste inside the coating die head cannot be quickly removed, which increases the pre-coating time and wastes the coating paste. SUMMARY

[0003] The utility model aims at providing a kind of pre-coating device and coating equipment to solve the technical problems in the prior art that the surface of the pre-coating roller is not ideal in terms of hydrophilicity, which makes it difficult for water-based coating paste to adhere to the surface and form a uniform liquid curtain on the surface quickly, so that the uneven paste inside the coating die head cannot be quickly removed, which increases the pre-coating time and wastes the coating paste.

[0004] In a first aspect, the utility model provides a pre-coating device, comprising: a pre-coating roller assembly and a hydrophilicity enhancement treatment module.

[0005] The pre-coating roller assembly includes a pre-coating roller, which is used to correspondingly cooperate with the lip of the coating die head. When the pre-coating roller rotates, it can bring the uneven coating inside the coating die head to the surface area opposite to the lip of the coating die head.

[0006] The hydrophilicity enhancement treatment module is arranged on the outer periphery of the pre-coating roller and is used to perform hydrophilicity enhancement treatment on the surface area of the pre-coating roller before it brings the uneven coating inside the coating die head.

[0007] In an optional embodiment, the hydrophilicity enhancement treatment module is a corona assembly, and the distance between the corona assembly and the pre-coating roller is adjustable.

[0008] In an optional embodiment, the corona assembly includes a back plate, a fixed block, a pair of blocking bars, a corona fixed block and a corona tube.

[0009] A pair of blocking bars are respectively connected to the opposite ends of the back plate and form a mounting cavity between the back plate and the blocking bars.

[0010] The corona tube is parallel to the central axis of the pre-coating roller, is fixed in the mounting cavity by the fixing block, and has a working surface facing the surface of the pre-coating roller and used for performing corona on the surface area of the pre-coating roller.

[0011] The back plate is connected to the corona fixing block, and the position of the corona fixing block is adjustable to adjust the distance between the working surface of the corona tube and the surface of the pre-coating roller.

[0012] In an optional embodiment, a scraping assembly is further included, which is used for scraping the surface area of the pre-coating roller after the uneven coating in the coating die is taken out and before the corona is performed.

[0013] In an optional embodiment, the scraping assembly includes a soft scraper, a hard scraper, a soft scraper adjusting plate, a hard scraper adjusting plate, a scraper pressing plate, a spraying nozzle, an air spraying nozzle, and a cleaning liquid tank, and the spraying nozzle, the hard scraper, the cleaning liquid tank, the soft scraper, and the air spraying nozzle are sequentially arranged along the rotation direction of the pre-coating roller, so that the surface area of the pre-coating roller, from which the uneven coating in the coating die is taken out, can sequentially pass through the spraying nozzle, the hard scraper, the cleaning liquid tank, the soft scraper, and the air spraying nozzle.

[0014] The hard scraper is connected to the hard scraper adjusting plate by the scraper pressing plate, and the hard scraper adjusting plate is used for adjusting the distance between the hard scraper and the pre-coating roller.

[0015] The soft scraper is connected to the soft scraper adjusting plate by the scraper pressing plate, and the soft scraper adjusting plate is used for adjusting the distance between the soft scraper and the pre-coating roller.

[0016] In an optional embodiment, the corona assembly further includes a roller air spraying baffle, the air spraying nozzle, the roller air spraying baffle, and the corona tube are sequentially arranged along the rotation direction of the pre-coating roller.

[0017] The position of the roller air spraying baffle is adjustable to adjust the distance between the roller air spraying baffle and the pre-coating roller, and the roller air spraying baffle is used for blocking the liquid splashed from the air spraying nozzle when the air spraying nozzle sprays.

[0018] In an optional embodiment, the corona assembly further includes a suction nozzle arranged on the back plate and used for absorbing the gas generated when the corona tube performs corona.

[0019] In an optional embodiment, along the axial direction of the pre-coating roller, both ends of the corona tube protrude from both ends of the surface of the pre-coating roller.

[0020] and / or;

[0021] The distance between the working surface of the corona tube and the surface of the pre-coating roller is 2-5mm.

[0022] In an optional embodiment, the pre-coating roller assembly further comprises a bearing seat, a belt and a motor.

[0023] The mounting shaft of the pre-coating roller is connected to the bearing of the bearing seat, and the bearing is drivingly connected to the output end of the motor through the belt.

[0024] In a second aspect, the utility model provides a kind of coating equipment, including the pre-coating device of any one of preceding embodiment.

[0025] Compared with prior art, the pre-coating device and coating equipment provided by the utility model have the following technical advantages:

[0026] The pre-coating device provided by the utility model comprises a pre-coating roller assembly and a hydrophilicity enhancement treatment module. The pre-coating roller assembly comprises a pre-coating roller. The pre-coating roller is used to correspondingly cooperate with the lip of a coating die head. When the pre-coating roller rotates, the surface area of the pre-coating roller that directly faces the lip of the coating die head can carry out the uneven coating material in the coating die head. The hydrophilicity enhancement treatment module is arranged on the outer circumferential side of the pre-coating roller and is used to perform hydrophilicity enhancement treatment on the surface area of the pre-coating roller before the surface area carries out the uneven coating material in the coating die head.

[0027] The hydrophilicity enhancement treatment module performs hydrophilicity enhancement treatment on the surface area of the pre-coating roller before the surface area carries out the uneven coating material in the coating die head, so that the surface area of the pre-coating roller is hydrophilic. For water-based coating, it is easier to adhere to the surface area of the pre-coating roller. The pre-coating roller rotates to make the surface area of the pre-coating roller pass through the hydrophilicity enhancement treatment module first and then pass through the lip of the coating die head, which is beneficial to quickly form a liquid curtain to quickly carry out the uneven coating material in the coating die head, reduce the pre-coating time, and also reduce the waste of slurry.

[0028] The coating equipment provided by the utility model comprises the pre-coating device described above. Therefore, the technical advantages and effects achieved by the pre-coating device described above are also achieved by the coating equipment. Here, no detailed description is given.

[0029] Other features and advantages of the utility model will be described in detail in the subsequent specific embodiment part. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiment or the prior art description. Obviously, the drawings in the following description are some embodiments of the utility model. For those skilled in the art, other drawings can also be obtained on the basis of these drawings without creating labor.

[0031] Figure 1 A pre-coating device structure schematic view is provided for the embodiment of the utility model;

[0032] Figure 2 A pre-coating roller assembly structure schematic view is provided for the embodiment of the utility model;

[0033] Figure 3 A pre-coating device side sectional view is provided for the embodiment of the utility model;

[0034] Figure 4 A corona assembly structure schematic view is provided for the embodiment of the utility model;

[0035] Figure 5 A corona assembly rear view is provided for the embodiment of the utility model;

[0036] Figure 6 A pre-coating device structure schematic view is provided for the embodiment of the utility model; Figure 5 A-A section view.

[0037] Icon: 1-pre-coating roller assembly; 2-pre-coating roller; 3-corona assembly; 4-back plate; 5-fixed block; 6-bar; 7-corona fixed block; 8-corona tube; 9-wiping assembly; 10-soft scraper; 11-hard scraper; 12-soft scraper adjusting plate; 13-hard scraper adjusting plate; 14-scraper pressure plate; 15-spraying nozzle; 16-air spraying nozzle; 17-cleaning liquid tank; 18-roller air spraying baffle; 19-air suction nozzle; 20-bearing seat; 21-belt; 22-motor. DETAILED DESCRIPTION

[0038] The technical scheme of the utility model will be described below in conjunction with the embodiments, obviously, the described embodiments are a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor belong to the protection scope of the utility model.

[0039] In the description of the utility model, it needs to be explained that the orientation or position relation indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is the orientation or position relation based on the shown in the drawings, only for the convenience of describing the utility model and simplifying the description, and not indicating or implying that the indicated device or element must have a particular orientation, a particular orientation and operation, therefore, it cannot be understood as the limitation of the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0040] In the description of the utility model, it is necessary to explain that, unless there is definite stipulation and limitation, the term "installation", "connection", "connection" should be broad sense understanding, for example, it can be fixed connection, also can be detachable connection, or integrally connected, can be mechanical connection, also can be electrical connection, can be direct connection, also can be indirectly connected through intermediate medium, can be the communication inside two elements. For ordinary skilled person in the art, the specific meaning of the above-mentioned term in the utility model can be understood according to specific circumstances.

[0041] In addition, the technical solutions among various embodiments can be combined with each other, but it must be based on that the ordinary skilled person in the art can realize, when the combination of technical solutions appears mutual contradiction or cannot be realized, it should be considered that the combination of technical solutions does not exist, also not within the protection scope required by the utility model.

[0042] The utility model will be described further in detail below through specific embodiment and in conjunction with the drawings.

[0043] Specific structure as Figures 1 to 6 Indicated.

[0044] The embodiment provides a kind of pre-coating device, comprising: pre-coating roller assembly 1 and hydrophilic enhancement processing module;Pre-coating roller assembly 1 includes pre-coating roller 2, pre-coating roller 2 is used to correspond with the lip of coating die head cooperation, the surface area of pre-coating roller 2 can take out uneven coating in coating die head when rotating and facing coating die head lip;Hydrophilic enhancement processing module is set to the outer circumferential side of pre-coating roller 2, and is used to carry out hydrophilic enhancement processing to the surface area of pre-coating roller 2 before taking out uneven coating in coating die head.

[0045] In the embodiment, hydrophilic enhancement processing module carries out hydrophilic enhancement processing to the surface area of pre-coating roller 2 before taking out uneven coating in coating die head, so that the surface area of pre-coating roller 2 is hydrophilic enhancement, more easily adheres to the surface area of pre-coating roller 2 for water-based coating, pre-coating roller 2 is treated by rotating and then passing through the lip of coating die head after the surface area of pre-coating roller 2 passes through hydrophilic enhancement processing module, beneficial to quickly form liquid curtain, to take out uneven coating in coating die head, reduce pre-coating time, also reduce the waste of slurry.

[0046] In the optional technical solutions of the embodiment, the hydrophilic enhancement processing module is corona assembly 3, and the spacing between corona assembly 3 and pre-coating roller 2 is adjustable. Improve applicability.

[0047] In the optional technical solutions of the embodiment, the hydrophilic enhancement processing module is plasma assembly, and the spacing between plasma assembly and pre-coating roller 2 is adjustable. Improve applicability.

[0048] In the embodiment, the surface of the pre-coating roller 2 is treated by the plasma assembly, so that the hydrophilicity of the surface of the pre-coating roller 2 is effectively improved.

[0049] In an optional technical solution of the embodiment, the corona assembly 3 comprises a back plate 4, a fixing block 5, a pair of blocking strips 6, a corona fixing block 7 and a corona tube 8. The blocking strips 6 are respectively connected to opposite ends of the back plate 4 and form mounting cavities with the back plate 4. The corona tube 8 is parallel to the central axis of the pre-coating roller 2. The corona tube 8 is fixed in the mounting cavities through the fixing block 5. The working surface of the corona tube 8 faces the surface of the pre-coating roller 2 and is used for performing corona on the surface area of the pre-coating roller 2. The back plate 4 is connected to the corona fixing block 7. The position of the corona fixing block 7 is adjustable, so as to adjust the distance between the working surface of the corona tube 8 and the surface of the pre-coating roller 2.

[0050] In the embodiment, the corona tube 8 is a ceramic electrode tube. The ceramic electrode tube is used to realize the corona function. The corona fixing block 7 is fixed through horizontal bolts and upper bolts. The corona fixing block 7 can be moved forward and backward by loosening the horizontal bolts. The corona fixing block 7 can be moved up and down by loosening the upper bolts. In this way, the distance between the corona tube 8 and the surface of the pre-coating roller 2 is adjusted. The structure is simple and convenient to adjust. The corona tube 8 is connected to a corona controller. The corona intensity can be adjusted through the corona controller. The corona time per unit area of the pre-coating roller 2 is adjusted by the speed of the pre-coating roller 2. In this way, the whole pre-coating roller 2 is treated by the corona in a dead-angle-free and scanning manner. The overall structure of the corona assembly 3 is simple and convenient to install and adjust. The corona tube 8 is fixed in the mounting cavities through the fixing block 5. The corona tube 8 is stably installed and is prevented from being interfered from the outside.

[0051] In the optional technical solution of the embodiment, a scraping and washing assembly 9 is further included. The scraping and washing assembly 9 is used to scrape and wash the surface area of the pre-coating roller 2 after the surface area of the pre-coating roller 2 carries the uneven coating in the coating die and before the surface area of the pre-coating roller 2 is treated by the corona. During the rotation of the pre-coating roller 2, the scraping and washing assembly 9 can clean the part of the pre-coating roller 2 carrying the coating, so that the part of the pre-coating roller 2 carrying the coating can be continuously carried out of the coating die after the subsequent corona treatment.

[0052] In the optional technical solution of the embodiment, the scraping and washing assembly 9 comprises a soft scraper 10, a hard scraper 11, a soft scraper adjusting plate 12, a hard scraper adjusting plate 13, a scraper pressing plate 14, a spraying nozzle 15, an air spraying nozzle 16 and a cleaning liquid tank 17, and the spraying nozzle 15, the hard scraper 11, the cleaning liquid tank 17, the soft scraper 10 and the air spraying nozzle 16 are sequentially arranged along the rotation direction of the pre-coating roller 2, so that the surface area of the uneven coating in the coating die that is taken out by the pre-coating roller 2 can sequentially pass through the spraying nozzle 15, the hard scraper 11, the cleaning liquid tank 17, the soft scraper 10 and the air spraying nozzle 16; the hard scraper 11 is connected to the hard scraper adjusting plate 13 through the scraper pressing plate 14, and the hard scraper adjusting plate 13 is used to adjust the distance between the hard scraper 11 and the pre-coating roller 2; the soft scraper 10 is connected to the soft scraper adjusting plate 12 through the scraper pressing plate 14, and the soft scraper adjusting plate 12 is used to adjust the distance between the soft scraper 10 and the pre-coating roller 2.

[0053] In the embodiment, the pre-coating roller 2 rotates clockwise, and the surface area of the uneven coating in the coating die that is taken out by the pre-coating roller 2 is taken as an example for description. The area sequentially passes through the right spraying nozzle 15 to spray and wash the coating paste on the pre-coating roller 2, the right hard scraper 11 to scrape the coating paste on the pre-coating roller 2, the cleaning liquid tank 17 to soak and dissolve the unscraped coating paste after the pre-coating roller 2 continues to rotate, the left soft scraper 10 to scrape the cleaning liquid and the remaining coating paste on the pre-coating roller 2, and the left air spraying nozzle 16 to dry the cleaning liquid on the pre-coating roller 2, so that the area of the pre-coating roller 2 is ready for corona treatment, thereby ensuring the stability of the corona treatment.

[0054] In the embodiment, the soft scraper 10 and the hard scraper 11 will be worn after being used for a period of time, resulting in poor scraping effect. The soft scraper adjusting plate 12 and the hard scraper adjusting plate 13 can be correspondingly adjusted to continue to be used. The soft scraper adjusting plate 12 and the hard scraper adjusting plate 13 are fixed through screws, and the soft scraper adjusting plate 12 and the hard scraper adjusting plate 13 can be moved forward and backward by loosening the screws for fixing the soft scraper adjusting plate 12 and the hard scraper adjusting plate 13, so as to adjust the positions of the soft scraper adjusting plate 12 and the hard scraper adjusting plate 13. The adjustment is convenient and the structure is simple.

[0055] It should be noted that the lip of the coating die is placed opposite to the pre-coating roller 2, and the area on the surface of the pre-coating roller 2 between the corona assembly 3 and the lip is subjected to corona treatment, so that the pre-coating can be started without the need of performing corona treatment on the whole pre-coating roller 2 before the pre-coating, thereby reducing the pre-coating preparation time.

[0056] In the optional technical solution of the embodiment, the corona assembly 3 further comprises a roller air spraying baffle 18, and the air spraying nozzle 16, the roller air spraying baffle 18 and the corona tube 8 are sequentially arranged along the rotation direction of the pre-coating roller 2; the position of the roller air spraying baffle 18 is adjustable to adjust the distance between the roller air spraying baffle 18 and the pre-coating roller 2, and the roller air spraying baffle 18 is used to block the liquid splashed to the corona tube 8 when the air spraying nozzle 16 sprays air.

[0057] In the embodiment, the left roller air shower baffle 18 is located above the air shower nozzle 16, and the roller air shower baffle 18 realizes the water isolation function, so as to avoid water splashing on the corona tube 8 when the air shower nozzle 16 performs air shower on the surface of the pre-coating roller 2. At the same time, the extension length of the roller air shower baffle 18 is adjustable, that is, the distance between the roller air shower baffle 18 and the pre-coating roller 2 is adjustable, so that the shielding position of the roller air shower baffle 18 can be adjusted according to the requirement, and the applicability is improved.

[0058] In the optional technical scheme of the embodiment, the corona assembly 3 further comprises an air suction nozzle 19, which is arranged on the back plate 4 and is used to suck the gas generated when the corona tube 8 generates corona.

[0059] In the embodiment, the corona tube 8 generates harmful waste gas such as ozone when generating corona, and the harmful waste gas such as ozone is removed by the negative pressure of the air suction nozzle 19 installed on the back plate 4. The corona assembly 3 has an independent air extraction function, which prevents the harmful waste gas from polluting the air.

[0060] In the optional technical scheme of the embodiment, along the axial direction of the pre-coating roller 2, the two ends of the corona tube 8 protrude from the two ends of the surface of the pre-coating roller 2; and / or the distance between the working surface of the corona tube 8 and the surface of the pre-coating roller 2 is 2-5mm.

[0061] In the embodiment, the two ends of the corona tube 8 protrude from the two ends of the surface of the pre-coating roller 2, so as to ensure that the part of the surface of the pre-coating roller 2 corresponding to the corona tube 8 can be corona-treated in the axial direction, and thus the entire surface of the pre-coating roller 2 can realize the enhancement of hydrophilicity. Preferably, the two ends of the corona tube 8 protrude from the two ends of the surface of the pre-coating roller 2 by 10-30mm. At the same time, the distance between the working surface of the corona tube 8 and the surface of the pre-coating roller 2 is 2-5mm, so as to ensure the stability and effect of the corona.

[0062] In the optional technical scheme of the embodiment, the pre-coating roller assembly 1 further comprises a bearing seat 20, a belt 21 and a motor 22; the mounting shaft of the pre-coating roller 2 is connected to the bearing of the bearing seat 20, and the bearing is drivingly connected to the output end of the motor 22 through the belt 21. The motor 22 rotates, and drives the bearing of the bearing seat 20 to rotate to drive the rotation of the pre-coating roller 2, and the speed of the pre-coating roller 2 can be adjusted according to the production process requirement. The overall structure is simple and the transmission is stable.

[0063] The pre-coating device provided by the embodiment has compact structure, can simultaneously perform spraying, hard scraping, immersion washing, soft scraping, air showering, corona treatment, waste gas extraction and pre-coating, realizes all the functional requirements of pre-coating, and improves production efficiency. Meanwhile, the corona assembly 3 can realize wide and omnidirectional continuous and uniform improvement of the hydrophilic property of the surface of the pre-coating roller 2, obviously improves the adhesion of the coating slurry on the pre-coating roller 2, the corona assembly 3 can independently exhaust waste gas to improve the working environment of the operator, the length of the corona tube 8 can be adapted to the length of the pre-coating roller 2, so that various specifications of products can be adapted, the structure has high universality, the corona treatment speed is improved, and the overall coating efficiency is improved.

[0064] The coating device provided by the embodiment comprises the pre-coating device, and therefore the technical advantages and effects achieved by the coating device include the technical advantages and effects achieved by the pre-coating device, which will not be described herein.

[0065] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A pre-coating device, characterized in that, include: Pre-coated roller assembly (1) and hydrophilicity enhancement treatment module; The pre-coating roller assembly (1) includes a pre-coating roller (2), which is used to cooperate with the lip of the coating die head. When the pre-coating roller (2) rotates, it can bring out the uneven coating material inside the coating die head from the surface area facing the lip of the coating die head. The hydrophilicity enhancement module is disposed on the outer periphery of the pre-coating roller (2) and is used to perform hydrophilicity enhancement treatment on the surface area of ​​the pre-coating roller (2) before the uneven coating is carried out from the coating die.

2. The pre-coating device according to claim 1, characterized in that, The hydrophilicity enhancement module is a corona component (3), and the distance between the corona component (3) and the pre-coating roller (2) is adjustable.

3. The pre-coating device according to claim 2, characterized in that, The corona assembly (3) includes a back plate (4), a fixing block (5), a pair of baffles (6), a corona fixing block (7), and a corona tube (8); A pair of the baffles (6) are respectively connected to opposite ends of the back plate (4) and form an installation cavity between them and the back plate (4); The corona tube (8) is parallel to the central axis of the pre-coating roller (2). The corona tube (8) is fixed in the mounting cavity by the fixing block (5), and the working surface of the corona tube (8) faces the surface of the pre-coating roller (2) and is used to corona treat the surface area of ​​the pre-coating roller (2). The back plate (4) is connected to the corona fixing block (7), and the position of the corona fixing block (7) is adjustable to adjust the distance between the working surface of the corona tube (8) and the surface of the pre-coating roller (2).

4. The pre-coating device according to claim 3, characterized in that, It also includes a scraping assembly (9) for scraping the surface area of ​​the pre-coating roller (2) after the uneven coating is carried out from the coating die and before corona treatment.

5. The pre-coating apparatus according to claim 4, characterized in that, The scraping assembly (9) includes a soft scraper (10), a hard scraper (11), a soft scraper adjustment plate (12), a hard scraper adjustment plate (13), a scraper pressure plate (14), a spray nozzle (15), an air shower nozzle (16), and a cleaning liquid tank (17). The spray nozzle (15), the hard scraper (11), the cleaning liquid tank (17), the soft scraper (10), and the air shower nozzle (16) are arranged sequentially along the rotation direction of the pre-coating roller (2) so that the surface area of ​​the uneven coating material carried out by the pre-coating roller (2) from the coating die head can pass through the spray nozzle (15), the hard scraper (11), the cleaning liquid tank (17), the soft scraper (10), and the air shower nozzle (16) in sequence. The hard scraper (11) is connected to the hard scraper adjustment plate (13) via the scraper pressure plate (14), and the hard scraper adjustment plate (13) is used to adjust the distance between the hard scraper (11) and the pre-coating roller (2). The soft scraper (10) is connected to the soft scraper adjustment plate (12) via a scraper pressure plate (14), and the soft scraper adjustment plate (12) is used to adjust the distance between the soft scraper (10) and the pre-coating roller (2).

6. The pre-coating apparatus according to claim 5, characterized in that, The corona assembly (3) also includes a roller air shower baffle (18), and the air shower nozzle (16), the roller air shower baffle (18) and the corona tube (8) are arranged sequentially along the rotation direction of the pre-coating roller (2); The position of the roller air shower baffle (18) is adjustable to adjust the distance between the roller air shower baffle (18) and the pre-coating roller (2). The roller air shower baffle (18) is used to block the liquid splashed onto the corona tube (8) by the air shower nozzle (16) during air showering.

7. The pre-coating apparatus according to claim 3, characterized in that, The corona assembly (3) also includes an air intake (19), which is disposed on the back plate (4) and is used to absorb the gas generated when the corona tube (8) is corona-electrode.

8. The pre-coating apparatus according to claim 3, characterized in that, Along the axial direction of the pre-coating roller (2), the two ends of the corona tube (8) protrude from the two ends of the surface of the pre-coating roller (2); and / or; The distance between the working surface of the corona tube (8) and the surface of the pre-coated roller (2) is 2-5 mm.

9. The pre-coating apparatus according to any one of claims 1-8, characterized in that, The pre-coated roller assembly (1) also includes a bearing housing (20), a belt (21), and a motor (22); The mounting shaft of the pre-coating roller (2) is connected to the bearing of the bearing housing (20), and the bearing is connected to the output end of the motor (22) via the belt (21).

10. A coating apparatus, characterized in that, Includes the pre-coating apparatus according to any one of claims 1-9.

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