CN220804068U - Coating device - Google Patents

Abstract

The utility model discloses a coating device, which comprises a coating trough, at least two reflux ports, at least one liquid supply port and a reflux plate, wherein the reflux plate is arranged on the side of the coating trough; the coating trough comprises a U-shaped trough, and a first baffle and a second baffle which are positioned at two opposite sides of the U-shaped trough; a micro-concave structure is arranged on one side of the first baffle plate and one side of the second baffle plate, which are away from the bottom of the U-shaped groove; the micro-concave structure is used for placing a structure to be coated; the liquid supply port and the reflux ports are arranged on the U-shaped groove, and the reflux ports are arranged along the extending direction of the U-shaped groove; the interval between two adjacent reflux ports is a fixed value; the reflux plate is positioned at one side of the bottom of the U-shaped groove, which is away from the micro-concave structure; a gap is formed between the reflux plate and the bottom of the U-shaped groove; in a direction perpendicular to the bottom surface of the return plate, the orthographic projection of the coating trough is located within the return plate. The technical scheme of the utility model has simple structure and can improve the working efficiency of the coating device.

Description

Coating device

Technical Field

The utility model relates to the technical field of coating, in particular to a coating device.

Background

In the field of liquid crystal display, an optical film, such as a diffusion film, an antiglare film, a brightness enhancing composite film, etc., satisfying specified requirements can be obtained by coating a coating liquid containing optical particles on the front or back of a different optical base film, such as PET, TAC, COP, PMMA, PC. Since the coating liquid contains optical particles having various particle diameters, the coating liquid is usually applied by a coating device such as a dimple or slit in order to ensure smooth application of the optical particles to the optical base film.

The micro-concave coating device is a coating device which is widely used at present, the coating of the micro-concave coating device adopts a single-point liquid supply mode frequently, the flow direction and the flow speed of the coating liquid in the coating trough can not be kept consistent due to the single-point liquid supply, vortex is easy to generate in the coating liquid, optical particles are extremely likely to be agglomerated in the coating liquid under the environment, then the optical particles are slowly deposited at the bottom of the coating trough, if the optical particles can not be removed in time, the surface of the coated optical film has coating defects such as wiredrawing, dark lines, stripes and the like, therefore, the coating trough needs to be cleaned by stopping the machine periodically, the coating production is interrupted due to the stop cleaning, and the overall production efficiency of the optical film is reduced.

Disclosure of utility model

The utility model provides a coating device which has a simple structure and can improve the working efficiency of the coating device.

In a first aspect, the present utility model provides a coating apparatus comprising: the device comprises a coating trough, at least two reflux ports, at least one liquid supply port and a reflux plate;

the coating trough comprises a U-shaped trough, and a first baffle and a second baffle which are positioned at two opposite sides of the U-shaped trough; a micro-concave structure is arranged on one side of the first baffle plate and one side of the second baffle plate, which are away from the bottom of the U-shaped groove; the micro-concave structure is used for placing a structure to be coated;

The liquid supply ports and the reflux ports are arranged on the U-shaped groove, and the reflux ports are arranged along the extending direction of the U-shaped groove; the interval between two adjacent reflux ports is a fixed value;

the reflux plate is positioned at one side of the bottom of the U-shaped groove, which is away from the micro-concave structure; a gap is formed between the reflux plate and the bottom of the U-shaped groove; in the direction perpendicular to the bottom surface of the return plate, the orthographic projection of the coating trough is positioned in the return plate.

Optionally, the coating device further includes: at least two return valves; each reflux valve is arranged in one-to-one correspondence with each reflux port;

One end of the reflux valve is communicated with the reflux port, and the other end of the reflux valve is suspended above the reflux plate.

Optionally, a gap between the reflux plate and the bottom of the U-shaped groove is h;

Wherein h is more than or equal to 10mm and less than or equal to 20mm.

Optionally, the radius of the structure to be coated is R, and the depth of the dimple structure is d0;

wherein d0-R is less than or equal to 4mm and less than or equal to 5mm.

Optionally, the radius of the U-shaped groove is d1;

wherein d1-R is 15mm or less and 20mm or less.

Optionally, the depth of the U-shaped groove is H, the vertical distance between the reflux port and the bottom of the U-shaped groove is H1, and the distance between the liquid supply port and the bottom of the U-shaped groove is H2;

Wherein H1 is more than or equal to 1/4*H and less than 1/3*H; h2 is more than or equal to 1/3*H and less than 1/2*H.

Optionally, the coating device further includes: a liquid inlet pipeline and a liquid supply tank;

The liquid supply tank comprises a liquid outlet;

One end of the liquid inlet pipeline is communicated with the liquid outlet, and the other end of the liquid inlet pipeline is communicated with the liquid supply port.

Optionally, the coating device further includes: a liquid return pipeline;

the reflux plate comprises a liquid return opening, and the liquid supply tank further comprises a liquid return inlet;

One end of the liquid return pipeline is communicated with the liquid return opening, and the other end of the liquid return pipeline is communicated with the liquid return inlet.

Optionally, the coating device further includes: a liquid inlet pump;

the liquid inlet pump is used for providing transmission power when the liquid in the backflow plate is transmitted to the liquid supply tank.

Optionally, the coating device further includes: a plurality of fasteners;

The first baffle plate and the second baffle plate are respectively fixed at two ends of the U-shaped groove through the fasteners.

According to the technical scheme, the coating device comprises a coating trough, at least two reflux ports, at least one liquid supply port and a reflux plate, wherein a first baffle plate and a second baffle plate are arranged on two opposite sides of a U-shaped trough, a micro-concave structure is arranged on one side, away from the bottom of the U-shaped trough, of the first baffle plate and the second baffle plate, and is used for placing a structure to be coated, so that a certain gap is reserved between the structure to be coated and the bottom of the U-shaped trough, and coating liquid can flow in the gap and be coated on the surface of the structure to be coated; the liquid supply opening is arranged on the U-shaped groove, so that liquid is conveyed to the U-shaped groove through the liquid supply opening, the reflux openings are all arranged on the U-shaped groove, and are arranged along the extending direction of the U-shaped groove, so that optical particles deposited in the U-shaped groove can flow onto the reflux plate through the reflux openings, a coating device is not required to be stopped, the production efficiency is improved, in addition, in the direction perpendicular to the bottom surface of the reflux plate, the orthographic projection of the coating trough is positioned in the reflux plate, the reflux plate can accommodate liquid flowing out of the reflux openings, colloid overflowed by the first baffle and the second baffle can be accommodated, a baffle overflow accommodating device is not required to be additionally arranged, the structure is simple, and recycling is convenient.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions of the prior art, a brief description will be given below of the drawings required for the embodiments or the description of the prior art, and it is obvious that although the drawings in the following description are specific embodiments of the present utility model, it is obvious to those skilled in the art that the basic concepts of the device structure, the driving method and the manufacturing method, which are disclosed and suggested according to the various embodiments of the present utility model, are extended and extended to other structures and drawings, and it is needless to say that these should be within the scope of the claims of the present utility model.

Fig. 1 is a schematic top view of a coating apparatus according to an embodiment of the present utility model;

fig. 2 is a schematic side view of a coating device according to an embodiment of the present utility model;

FIG. 3 is a schematic cross-sectional view taken along line A-A' of FIG. 1;

FIG. 4 is a schematic cross-sectional view of FIG. 1 along line B-B';

Fig. 5 is a schematic view of another cross-sectional structure along B-B' in fig. 1.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions of the present utility model will be clearly and completely described by means of implementation examples with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the basic concepts disclosed and suggested by the embodiments of the present utility model are within the scope of the present utility model.

Fig. 1 is a schematic top view of a coating apparatus according to an embodiment of the present utility model, and fig. 2 is a schematic side view of a coating apparatus according to an embodiment of the present utility model, with reference to fig. 1 and fig. 2, the coating apparatus includes: a coating trough 10, at least two return openings 11, at least one liquid supply opening 12 and a return plate 20; the coating trough 10 comprises a U-shaped trough 13, and a first baffle 14 and a second baffle 15 positioned on two opposite sides of the U-shaped trough 13; the side of the first baffle 14 and the second baffle 15, which is away from the bottom of the U-shaped groove 13, is provided with a micro-concave structure 16; the micro-concave structure 16 is used for placing the structure 1 to be coated; the liquid supply port 12 and each reflux port 11 are arranged on the U-shaped groove 13, and the reflux ports 11 are arranged along the extending direction of the U-shaped groove 13; the distance a between two adjacent reflux ports 11 is a fixed value; the reflux plate 20 is positioned at one side of the bottom of the U-shaped groove 13, which is away from the micro-concave structure 16; a gap is formed between the reflux plate 20 and the bottom of the U-shaped groove 13; in a direction perpendicular to the bottom surface of the return plate 20, the orthographic projection of the coating trough 10 is located within the return plate 20.

The material of the U-shaped groove 13 includes aluminum alloy or stainless steel, and has strong corrosion resistance and rigidity. The materials of the first baffle 14 and the second baffle 15 comprise tetrafluoroethylene plate bodies, teflon and the like, have good chemical stability, wear resistance and extremely low friction coefficient, are soft, and avoid damaging the structure 1 to be coated. The shape of the dimple 16 is related to the shape of the structure 1 to be coated, for example, the cross section of the structure 1 to be coated is circular, and the shape of the dimple 16 is circular arc, and may be set according to actual needs, and is not particularly limited herein. The structure 1 to be coated comprises a micro-concave roller or a coating roller and the like, and the micro-concave roller has the advantages of light weight, small diameter and the like and is convenient to replace. For convenience of description, the following description will take a cross-sectional shape of the structure 1 to be coated as a circle as an example.

Specifically, the liquid to be coated on the structure to be coated 1 can enter the U-shaped groove 13 through the liquid supply port 12 so as to be positioned in the structure to be coated 1 in the U-shaped groove 13, the coated liquid comprises resin glue solution with optical ions, two ends of the structure to be coated 1 are placed in the micro-concave structures 16 of the first baffle plate 14 and the second baffle plate 15, the structure to be coated 1 is suspended above the U-shaped groove 13 between the first baffle plate 14 and the second baffle plate 15, namely, a certain gap is reserved between the structure to be coated 1 and the U-shaped groove 13 so as to enable the liquid to flow, and the liquid is uniformly coated on the surface of the structure to be coated 1; in the coating process, substances such as optical particles in the liquid gradually settle towards the bottom of the U-shaped groove 13 under the action of gravity, and the liquid such as optical ions settled towards the bottom of the U-shaped groove 13 can flow onto the reflux plate 20 through the reflux port 11 arranged on the U-shaped groove 13, so that the optical ions settled towards the bottom of the U-shaped groove 13 are recovered under the condition that the coating device is not stopped, the effective working time of the coating device is prevented from being influenced by the optical ion deposition, and the production efficiency is improved; when the coating device works, liquid in the U-shaped groove 13 overflows to two opposite sides of the U-shaped groove 13, at this time, by arranging the first baffle plate 14 and the second baffle plate 15 on two opposite sides of the U-shaped groove 13, the baffle plates can prevent part of the liquid from flowing out, so that the liquid can be coated on the structure 1 to be coated, when the liquid level in the U-shaped groove 13 exceeds the bottom of the micro-concave structure 16, the liquid can overflow to the reflux plate 20 from the micro-concave structure 16 to recover the liquid, in addition, the first baffle plate 14 and the second baffle plate 15 both comprise the micro-concave structure 16, so that the structure 1 to be coated can be placed on the micro-concave structure 16, and when the structure 1 to be coated is controlled to rotate in the coating groove 10 by an external device, the micro-concave structure 16 can play a supporting role, so that one circle of the structure 1 to be coated can be contacted with the liquid in the rotating process, the problem that the coated liquid is scraped off due to the fact that the liquid cannot directly contact the bottom of the U-shaped groove 13 is avoided, and the coating quality of the structure 1 to be coated is improved.

It will be appreciated that the number of liquid supply ports 12 is related to the length of the U-shaped groove 13, and the greater the length of the U-shaped groove 13, the greater the number of liquid supply ports 12, so that the liquid supply efficiency can be improved, and the pulse intensity when the liquid enters the U-shaped groove 13 can be reduced, so that the liquid can slowly and uniformly enter the U-shaped groove 13, and bubbles, vortices and the like generated in the U-shaped groove 13 by the liquid can be further reduced, so as to improve the liquid coating quality of the structure 1 to be coated. For example, when the length of the U-shaped groove 13 is 840mm, the number of the liquid supply ports 12 is 3, which may be uniformly distributed on one side of the U-shaped groove 13, or may be uniformly distributed on two sides of the U-shaped groove 13, and may be set according to actual needs, which is not specifically limited herein. The number of the return ports 11 is related to the length of the U-shaped groove 13 to prevent sedimentation of optical particles and the like from affecting the coating quality of the coating apparatus, to improve the coating quality and the coating efficiency, and illustratively, when the length of the U-shaped groove 13 is 840mm, the number of the return ports 11 is 5, and the interval a between two adjacent return ports 11 is 180mm.

According to the technical scheme, the coating device comprises a coating trough, at least two reflux ports, at least one liquid supply port and a reflux plate, wherein a first baffle plate and a second baffle plate are arranged on two opposite sides of a U-shaped trough, a micro-concave structure is arranged on one side, away from the bottom of the U-shaped trough, of the first baffle plate and the second baffle plate, and is used for placing a structure to be coated, so that a certain gap is reserved between the structure to be coated and the bottom of the U-shaped trough, and coating liquid can flow in the gap and be coated on the surface of the structure to be coated; the liquid supply opening is arranged on the U-shaped groove, so that liquid is conveyed to the U-shaped groove through the liquid supply opening, the reflux openings are all arranged on the U-shaped groove, and are arranged along the extending direction of the U-shaped groove, so that optical particles deposited in the U-shaped groove can flow onto the reflux plate through the reflux openings, a coating device is not required to be stopped, the production efficiency is improved, in addition, in the direction perpendicular to the bottom surface of the reflux plate, the orthographic projection of the coating trough is positioned in the reflux plate, the reflux plate can accommodate liquid flowing out of the reflux openings, colloid overflowed by the first baffle and the second baffle can be accommodated, a baffle overflow accommodating device is not required to be additionally arranged, the structure is simple, and recycling is convenient.

Optionally, fig. 3 is a schematic cross-sectional structure along A-A' in fig. 1, and as shown in fig. 3, the coating device further includes: at least two return valves 17; the reflux valves 17 are arranged in one-to-one correspondence with the reflux ports 11; one end of the reflux valve 17 is communicated with the reflux port 11, and the other end of the reflux valve 17 is suspended above the reflux plate 20.

The return valve 17 includes a valve such as a throttle valve that can control the flow rate or flow of the liquid, and may be set according to actual needs, and is not particularly limited herein.

Specifically, by providing the reflux valves 17 at the reflux ports 11, when the sedimentation rate of the optical particles in the liquid is high or the concentration of the optical particles is high, the valve opening of the reflux valve 17 can be adjusted to the maximum so that the optical particles in the liquid can flow to the reflux plate 20 through the reflux ports 11 and the reflux valves 17 at a high speed or a high flow rate; when the sedimentation rate of the optical particles in the liquid is smaller or the concentration of the optical particles is lower, the valve opening of the backflow valve 17 can be adjusted to be smaller, so that the optical particles in the liquid can flow onto the backflow plate 20 through the backflow port 11 and the backflow valve 17 at a slower speed or a smaller flow rate, and the opening of the backflow valve 17 can be adjusted according to the actual situation, so that the coating quality and the coating efficiency of the coating device can be improved.

Alternatively, referring to fig. 3, the clearance between the return plate 20 and the bottom of the U-shaped groove 13 is h; wherein h is more than or equal to 10mm and less than or equal to 20mm.

Wherein the material of the return plate 20 comprises stainless steel or the like such that the return plate 20 has a smooth surface.

Specifically, if the gap h between the backflow plate 20 and the bottom of the U-shaped groove 13 is smaller than 10mm, when the coating device works, and when the amount of the liquid flowing out from the backflow port 11 and the amount of the liquid overflowing from the micro-concave structure 16 are large, the liquid flowing onto the backflow plate 20 may block the backflow port 11 or overflow to the micro-concave structure 16, which affects the normal work of the coating device and reduces the working efficiency; if the clearance h between the reflux plate 20 and the bottom of the U-shaped groove 13 is larger than 20mm, the whole structure of the coating device is larger, and the coating device occupies larger space when working; therefore, the clearance h between the reflux plate 20 and the bottom of the U-shaped groove 13 is set between 10mm and 20mm to improve the working efficiency and space utilization of the coating device.

Alternatively, referring to fig. 2, the radius of the structure 1 to be coated is R and the depth of the dimple 16 is d0; wherein d0-R is less than or equal to 4mm and less than or equal to 5mm.

Specifically, the radius R of the structure 1 to be coated may be set according to actual needs, and is not specifically limited herein, alternatively, 25mm R is less than or equal to 30mm, and in an exemplary embodiment, the radius R of the structure 1 to be coated is 30mm. If the difference between the radius d0 of the micro-concave structure 16 and the radius R of the structure 1 to be coated is smaller than 4mm, resulting in a larger contact area between the micro-concave structure 16 and the structure 1 to be coated when the structure 1 to be coated is placed in the micro-concave structure 16, when the structure 1 to be coated is controlled to rotate through external arrangement, the friction force of the contact part of the micro-concave structure 16 and the structure 1 to be coated is larger, the first baffle 14 or the second baffle 15 is easily worn out under the larger friction force to generate fragments, part of the fragments can enter the U-shaped groove 13, and in the process of coating the structure 1 to be coated, the fragments of the first baffle 14 or the second baffle 15 can reach the surface of the structure 1 to be coated, so that the coating quality is affected; if the difference between the radius d0 of the micro-concave structure 16 and the radius R of the structure 1 to be coated is greater than 5mm, resulting in a smaller contact area between the micro-concave structure 16 and the structure 1 to be coated when the structure 1 to be coated is placed in the micro-concave structure 16, a larger liquid leakage gap is generated, and the liquid in the U-shaped groove 13 passes through the liquid leakage gap between the first baffle 14 and the structure 1 to be coated, or the liquid leakage amount between the second baffle 15 and the liquid leakage gap between the second baffle 15 and the structure 1 to be coated is larger, so that the liquid level in the U-shaped groove 13 is lower, and the coating quality and the coating efficiency are affected; therefore, the difference between the radius d0 of the micro concave structure 16 and the radius R of the structure 1 to be coated is set between 4mm and 5mm to protect the micro concave structure 16 and the structure 1 to be coated, improving coating quality and coating efficiency.

Alternatively, referring to fig. 3, the u-shaped groove 13 has a radius d1; wherein d1-R is 15mm or less and 20mm or less.

Specifically, if the difference between the radius d1 of the U-shaped groove 13 and the radius R of the structure 1 to be coated is smaller than 15mm, the liquid flow entering the U-shaped groove 13 from the liquid supply port 12 is smaller, and the liquid coating requirement of the structure 1 to be coated cannot be met; if the difference between the radius d1 of the U-shaped groove 13 and the radius R of the structure 1 to be coated is larger than 20mm, the liquid flow entering the U-shaped groove 13 from the liquid supply port 12 is more, the liquid overflowed from the first baffle 14 and the second baffle 15 is more, and the liquid utilization rate is lower; therefore, the difference between the radius d1 of the U-shaped groove 13 and the radius R of the structure 1 to be coated is set between 15mm and 20mm, so that the liquid utilization rate is improved.

Optionally, fig. 4 is a schematic cross-sectional structure along B-B' in fig. 1, referring to fig. 3 and 4,U, the depth of the groove 13 is H, the vertical distance between the return port 11 and the bottom of the U-shaped groove 13 is H1, and the distance between the liquid supply port 12 and the bottom of the U-shaped groove 13 is H2; wherein H1 is more than or equal to 1/4*H and less than 1/3*H; h2 is more than or equal to 1/3*H and less than 1/2*H.

Specifically, if the vertical distance H1 between the return port 11 and the bottom of the U-shaped groove 13 is smaller than 1/4*H, the liquid in the U-shaped groove 13 flows out through the return port 11 under the action of gravity, so that the liquid coated on the surface of the structure 1 to be coated is less, and the coating quality is affected; if the vertical distance H1 between the return port 11 and the bottom of the U-shaped groove 13 is greater than or equal to 1/3*H, the return port 11 has a certain height, so that the substances such as optical particles in the liquid cannot flow out from the return port 11 and still deposit at the bottom of the U-shaped groove 13, thereby affecting the coating quality and the working efficiency; therefore, the vertical distance H1 between the reflux port 11 and the bottom of the U-shaped groove 13 is set between 1/4*H and 1/3*H, so that the optical particles flowing to the bottom of the U-shaped groove 13 can flow out from the reflux port, and the coating quality and the working efficiency of the coating device are improved.

Correspondingly, if the distance H2 between the liquid supply port 12 and the bottom of the U-shaped groove 13 is smaller than 1/3*H, the liquid entering from the liquid supply port 12 may flow out through the liquid return port 11, reducing the coating efficiency; if the distance H2 between the liquid supply port 12 and the bottom of the U-shaped groove 13 is greater than or equal to 1/2*H, the liquid flowing into the U-shaped groove 13 at a position greater than 1/2*H will generate more bubbles to affect the coating quality because the liquid entering through the liquid supply port 12 has a certain pressure, so that the distance H2 between the liquid supply port 12 and the bottom of the U-shaped groove 13 is set between 1/3*H and 1/2*H, so that the liquid flowing from the liquid supply port 12 to the U-shaped groove 13 can be uniformly distributed in the U-shaped groove 13, and the coating quality and the working efficiency of the coating device are improved.

Optionally, fig. 5 is a schematic view of another cross-sectional structure along B-B' in fig. 1, and as shown in fig. 5, the coating device further includes: a liquid feed pipe 31 and a liquid feed tank 30; the liquid supply tank 30 includes a liquid outlet O1; one end of the liquid inlet pipeline 31 is communicated with the liquid outlet O1, and the other end of the liquid inlet pipeline 31 is communicated with the liquid supply port 12.

The materials of the liquid storage tank 30 and the liquid inlet pipe 31 include aluminum alloy or stainless steel, which can be set according to actual needs, and are not limited herein.

Specifically, the liquid storage tank 30 is used for storing liquid required for coating, so that when the coating device works, the liquid can be continuously supplied to the U-shaped groove 13 through the liquid inlet pipeline 31, and the coating device is prevented from stopping running due to insufficient liquid supply, so that the running stability and reliability of the coating device are improved.

Optionally, referring to fig. 5, the coating apparatus further includes: a liquid return line 21; the return plate 20 includes a return opening 22, and the liquid supply tank 30 further includes a return inlet I1; one end of the liquid return pipeline 21 is communicated with the liquid return opening 22, and the other end of the liquid return pipeline 21 is communicated with the liquid return inlet I1.

Specifically, the plate surface of the reflux plate 20 may be inconsistent, that is, the reflux plate has a portion with a higher plate surface and a portion with a lower plate surface, the liquid return opening 22 may be disposed at a position with a lower plate surface, so that the liquid flowing to the reflux plate 20 flows from the position with a higher plate surface to the position with a lower plate surface, and then enters the liquid supply tank 30 through the liquid return pipeline 21 communicated with the liquid return opening 22, so that the liquid can be reused, and the resource utilization rate is improved.

Optionally, referring to fig. 5, the coating apparatus further includes: a liquid feed pump 32; the feed pump 32 is used to provide transmission power as the liquid in the return plate 20 is transferred to the feed tank 30.

The liquid inlet pump 32 includes a screw pump, a gear pump, a diaphragm pump, and the like, and may be selected according to actual needs, and is not particularly limited herein.

Specifically, the liquid inlet pump 32 may be disposed on the liquid inlet pipe 31, or the liquid inlet pump 32 is directly disposed in the liquid supply tank 30, so that the liquid in the liquid supply tank 30 can be transferred to the U-shaped groove 13 at a larger flow rate or velocity, so as to ensure the supply velocity of the liquid. In addition, the working power of the liquid inlet pump 32 can be adjusted to control the rate of liquid entering the U-shaped groove 13 so as to adapt to different working requirements of the coating device, and the device has higher practicability.

Optionally, referring to fig. 2, the coating apparatus further includes: a plurality of fasteners 18; the first baffle 14 and the second baffle 15 are fixed to both ends of the U-shaped groove 13 by respective fasteners 18.

The fasteners 18 include screws or bolts, etc., and may be provided as desired, with exemplary fasteners 18 including handled screws.

Specifically, holes may be drilled at corresponding positions of the first baffle 14 and one side end face of the U-shaped groove 13, and holes may be drilled at corresponding positions of the second baffle 15 and the other side end face of the U-shaped groove 13, so that fasteners 18 such as screws may pass through corresponding holes to fix the first baffle 14 and the second baffle 15, thereby improving stability of the first baffle and the second baffle. The number of the fasteners 18 may be set according to actual needs, and the number of the fasteners 18 is exemplified by 3, but may be other, and is not particularly limited herein.

It will be appreciated that the above description is only exemplified by the first baffle 14 and the second baffle 15 being fixedly connected to the U-shaped groove 13 by fasteners, and that the first baffle 14 and the second baffle 15 may also be integrally formed with the U-shaped groove 13, i.e. the first baffle 14 and the second baffle 15 may be disposed on opposite sides of the U-shaped groove 13 during the preparation of the U-shaped groove 13, and may be fixedly connected by casting or welding.

Note that the above is only a preferred embodiment of the present utility model and the technical principle applied. It will be understood by those skilled in the art that the present utility model is not limited to the particular embodiments described herein, and that various obvious changes, rearrangements, combinations, and substitutions can be made by those skilled in the art without departing from the scope of the utility model. Therefore, while the utility model has been described in connection with the above embodiments, the utility model is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the utility model, which is set forth in the following claims.

Claims (10)

1. A coating apparatus, characterized by comprising: the device comprises a coating trough, at least two reflux ports, at least one liquid supply port and a reflux plate;

the coating trough comprises a U-shaped trough, and a first baffle and a second baffle which are positioned at two opposite sides of the U-shaped trough; a micro-concave structure is arranged on one side of the first baffle plate and one side of the second baffle plate, which are away from the bottom of the U-shaped groove; the micro-concave structure is used for placing a structure to be coated;

The liquid supply ports and the reflux ports are arranged on the U-shaped groove, and the reflux ports are arranged along the extending direction of the U-shaped groove; the interval between two adjacent reflux ports is a fixed value;

the reflux plate is positioned at one side of the bottom of the U-shaped groove, which is away from the micro-concave structure; a gap is formed between the reflux plate and the bottom of the U-shaped groove; in the direction perpendicular to the bottom surface of the return plate, the orthographic projection of the coating trough is positioned in the return plate.

2. The coating apparatus of claim 1, further comprising: at least two return valves; each reflux valve is arranged in one-to-one correspondence with each reflux port;

One end of the reflux valve is communicated with the reflux port, and the other end of the reflux valve is suspended above the reflux plate.

3. The coating apparatus of claim 1, wherein a gap between the reflow plate and a bottom of the U-shaped groove is h;

Wherein h is more than or equal to 10mm and less than or equal to 20mm.

4. The coating apparatus of claim 1, wherein the radius of the structure to be coated is R and the depth of the dimple structure is d0;

wherein d0-R is less than or equal to 4mm and less than or equal to 5mm.

5. The coating apparatus of claim 4 wherein the U-shaped slot has a radius d1;

wherein d1-R is 15mm or less and 20mm or less.

6. The coating apparatus according to claim 1, wherein the U-shaped groove has a depth H, a vertical distance between the return port and a bottom of the U-shaped groove is H1, and a distance between the liquid supply port and the bottom of the U-shaped groove is H2;

Wherein H1 is more than or equal to 1/4*H and less than 1/3*H; h2 is more than or equal to 1/3*H and less than 1/2*H.

7. The coating apparatus of claim 1, further comprising: a liquid inlet pipeline and a liquid supply tank;

The liquid supply tank comprises a liquid outlet;

One end of the liquid inlet pipeline is communicated with the liquid outlet, and the other end of the liquid inlet pipeline is communicated with the liquid supply port.

8. The coating apparatus of claim 7, further comprising: a liquid return pipeline;

the reflux plate comprises a liquid return opening, and the liquid supply tank further comprises a liquid return inlet;

One end of the liquid return pipeline is communicated with the liquid return opening, and the other end of the liquid return pipeline is communicated with the liquid return inlet.

9. The coating apparatus of claim 8, further comprising: a liquid inlet pump;

the liquid inlet pump is used for providing transmission power when the liquid in the backflow plate is transmitted to the liquid supply tank.

10. The coating apparatus of claim 1, further comprising: a plurality of fasteners;

The first baffle plate and the second baffle plate are respectively fixed at two ends of the U-shaped groove through the fasteners.