Coating production line

Abstract

The utility model belongs to the technical field of coating, and discloses a coating production line. The coating production line comprises a cleaning device, a coating device and a drying device which are arranged in sequence and used for cleaning, coating and drying a base plate in sequence, the coating device comprises a conveying line and a plurality of coating assemblies arranged in the first direction, the coating production line further comprises a backflow conveying device, and the backflow conveying device is located on the side of the coating device. According to the coating production line disclosed by the utility model, a plurality of coating assemblies are arranged, so that the single coating production line has four coating modes of single-time multi-layer coating, single-time single-layer coating, multi-time multi-layer coating and multi-time single-layer coating, and the effects of saving cost and improving efficiency and quality are achieved. In addition, the substrate needing to be coated for multiple times is subjected to backflow through the backflow conveying equipment, the coating equipment can continuously coat other substrates in the backflow process of the substrate, and therefore the operation efficiency is further improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to coating technology field especially relates to a coating production line. BACKGROUND

[0002] Coating refers to uniformly coating slurry or paint on a substrate to form a film layer on the surface of the substrate after the slurry or paint is dried. For example, in the production of photovoltaic panels, the substrate of the photovoltaic panel is mainly cleaned, dried, coated, exposed, and developed by the coating production line to realize the automatic production of the substrate.

[0003] Based on the requirements of the process, part of the substrate needs to be coated with multiple different paints to form different film layers. However, the coating machine used in the current coating production line can only coat one kind of paint at a time. If a second paint needs to be coated, the coating elements and related pipelines of the coating machine need to be cleaned before the second paint can be coated. This will result in a time-consuming change of paint, which not only greatly affects the production efficiency, but also limits the interval time between coating two different paints due to the cleaning speed, which cannot meet the requirements of high interval time occasions. If a separate production line is provided for each type of paint, the production cost will also increase dramatically.

[0004] Therefore, the above problems need to be solved. INVENTION CONTENTS

[0005] The utility model aims at providing a coating production line, which coats multiple different paints on the substrate according to the time required by the production process through a single production line, thereby improving the production efficiency and production quality of the product.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The coating production line comprises a cleaning device, a coating device, and a drying device arranged in sequence, which are used for cleaning, coating, and drying the substrate in sequence. The coating device comprises:

[0008] A conveying line, which can convey the substrate in a first direction; and

[0009] A coating assembly, which is arranged above the conveying line in the first direction and has multiple coating assemblies. Each coating assembly can coat paint on the upper surface of the substrate. The paints coated by the multiple coating assemblies are the same or different.

[0010] The coating production line further comprises:

[0011] A reverse flow conveying device is located beside the coating device, and the reverse flow conveying device can convey the substrate at the outfeed end of the coating device or the substrate at the outfeed end of the drying device to the infeed end of the coating device.

[0012] Preferably, the conveying line comprises:

[0013] A conveying frame;

[0014] A plurality of conveying tracks are spaced apart on the conveying frame in a second direction perpendicular to the first direction; and

[0015] Carriers are slidingly arranged on the conveying tracks, and at least one carrier is arranged on each conveying track, and a plurality of carriers arranged in a direction perpendicular to the second direction can cooperatively carry the substrate.

[0016] Preferably, each coating assembly comprises:

[0017] A coating frame; and

[0018] A coating blade is arranged on the coating frame, and a coating opening of the coating blade is located at the bottom of the coating blade.

[0019] Preferably, the coating blade is slidingly arranged on the coating frame in a vertical direction.

[0020] Preferably, the outfeed end of the cleaning device is provided with a first transfer robot;

[0021] The coating line further comprises:

[0022] A first baking oven is located beside the first transfer robot, and the first transfer robot can transfer the substrate at the outfeed end of the cleaning device to the first baking oven; and

[0023] An infeed conveying device is located between the first transfer robot and the coating device, the first transfer robot can also transfer the substrate inside the first baking oven to the infeed end of the infeed conveying device, and the outfeed end of the infeed conveying device is connected to the infeed end of the coating device.

[0024] Preferably, the outfeed end of the coating device is provided with a second transfer robot, and the drying device is located beside the second transfer robot, and the second transfer robot can transfer the substrate at the outfeed end of the coating device to the drying device.

[0025] The coating line further comprises:

[0026] A second baking oven is located on the side of the second transfer robot away from the coating device, and the second transfer robot can also transfer the substrate inside the drying device to the second baking oven.

[0027] Preferably, the second baking oven is provided with a third transfer robot on the side away from the coating device, and the third transfer robot can move the substrate inside the second baking oven out of the second baking oven and transfer the substrate inside the second baking oven to the counter-flow conveying device.

[0028] The discharge end of the counter-flow conveying device is provided with a fourth transfer robot, and the second transfer robot is used to transfer the substrate at the discharge end of the counter-flow conveying device to the feeding end of the coating device.

[0029] Preferably, the coating production line further comprises:

[0030] A discharge conveying device, the feeding end of the discharge conveying device is connected to the third transfer robot, and the third transfer robot can also transfer the substrate inside the second baking oven to the feeding end of the discharge conveying device.

[0031] Preferably, the coating production line further comprises:

[0032] A first process device and a second process device are sequentially arranged at the discharge end of the discharge conveying device.

[0033] Preferably, the distribution directions of the first process device and the second process device are opposite to the first direction.

[0034] The beneficial effects of the present application are as follows:

[0035] The coating production line of the present application sequentially arranges a cleaning device, a coating device and a drying device, which are sequentially used for cleaning, coating and drying the substrate, wherein the coating device has a plurality of coating assemblies, can coat one or more layers of paint on the surface of the substrate at a time, and the paint coated each time can be the same or different, so that a single coating production line has four coating modes of single-time multi-layer coating, single-time single-layer coating, multiple-time multi-layer coating and multiple-time single-layer coating, achieving the effects of saving cost, improving efficiency and improving quality. In addition, the counter-flow conveying device is arranged on the side of the coating device, so that the substrate that needs to be coated multiple times can be backflowed through the counter-flow conveying device, and the coating device can continue to coat other substrates during the backflow of the substrate, thereby further improving the work efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0036] Fig. 1 is a layout diagram of the coating production line of the present application;

[0037] Fig. 2 is a structural schematic view of the coating equipment of the utility model;

[0038] Fig. 3 is a structural schematic view of the conveying line of the utility model.

[0039] In the figure:

[0040] 100, substrate;

[0041] 1, cleaning equipment; 11, feeding machine; 12, first baking oven; 13, first transfer mechanical hand;

[0042] 2, coating equipment; 21, conveying line; 211, conveying frame; 212, conveying track; 213, carrier; 2131, supporting seat; 22, coating assembly; 221, coating frame; 222, coating cutter head;

[0043] 3, drying equipment; 31, second transfer mechanical hand; 32, second baking oven; 33, third transfer mechanical hand;

[0044] 4, feeding conveying equipment;

[0045] 5, counterflow conveying equipment; 51, fourth transfer mechanical hand;

[0046] 6, discharging conveying equipment; 61, fifth transfer mechanical hand;

[0047] 7, first process equipment;

[0048] 8, second process equipment;

[0049] 9, third process equipment; 91, third baking oven; 92, sixth transfer mechanical hand;

[0050] 10, offline conveying equipment. DETAILED DESCRIPTION

[0051] The utility model will be further described in detail below in combination with the drawings and examples. It can be understood that the specific examples described here are only used to explain the utility model and not limited to the utility model. In addition, it should be noted that in order to facilitate the description, only the part related to the utility model is shown in the drawings and not all structures.

[0052] In the description of the utility model, unless another definite provision and limitation, the term "link", "connect", "fix" should be broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can pass through the indirect connection of intermediate medium, can be two element internal communication or two element mutual action relation.For the ordinary skill in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances.

[0053] In the utility model, unless another definite provision and limitation, the first feature is "on" or "under" the second feature can include the direct contact of the first and second features, or the contact of the first and second features through another feature between them is not direct contact.And, the first feature "on", "above" and "above" the second feature includes the first feature directly above and obliquely above the second feature, or just indicates that the horizontal height of the first feature is higher than the second feature.The first feature "under", "below" and "below" the second feature includes the first feature directly below and obliquely below the second feature, or just indicates that the horizontal height of the first feature is less than the second feature.

[0054] In the description of the embodiment, the terms "up", "down", "right", etc. Orientation or position relationship is based on the orientation or position relationship shown in the drawing, only for the convenience of description and simplification operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the utility model.In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0055] The following refers to Figs. 1 to 3 The coating production line provided by the utility model is described.

[0056] Referring to Fig. 1 The coating production line comprises cleaning equipment 1, coating equipment 2 and drying equipment 3 arranged in sequence, and sequentially carries out cleaning, coating and drying to the substrate 100, wherein the feeding end of the cleaning equipment 1 is provided with a feeding machine 11.Through the feeding machine 11, the cleaning equipment 1 is fed, so that the substrate 100 enters the cleaning equipment 1 for cleaning, and then enters the coating equipment 2 for coating, and the substrate 100 enters the drying equipment 3 for drying after coating, so that the coating is quickly dried to form a film layer.

[0057] Specifically, the feeding machine 11 is any device capable of transplanting the substrate 100 in the prior art, and the specific structure is the prior art, which will not be described here. The cleaning device 1 is any device capable of cleaning and conveying the substrate 100 in the prior art, and the specific structure is the prior art, which will not be described here, and the conveying direction in the cleaning device 1 is the first direction. The first direction in the embodiment is the horizontal direction.

[0058] Further, the discharge end of the feeding conveying device 4 is provided with a first turnover manipulator 13, which is any manipulator capable of turning over the substrate 100 in the prior art, and the specific structure is the prior art, which will not be described here. The coating production line also includes a first baking oven 12 and a feeding conveying device 4, the first baking oven 12 is located on the side of the first turnover manipulator 13, and the first baking oven 12 and the first turnover manipulator 13 are distributed along the second direction perpendicular to the first direction. The second direction in the embodiment is also the horizontal direction. When the substrate 100 is cleaned, the substrate 100 is first turned over by the first turnover manipulator 13 to the first baking oven 12 for baking, and the cleaned substrate 100 is baked by the first baking oven 12 to quickly dry the substrate 100, so as to facilitate the coating of the coating on the surface of the substrate 100, thereby shortening the drying time of the cleaned substrate 100.

[0059] The feeding conveying device 4 is located between the first turnover manipulator 13 and the feeding end of the coating device 2, the discharge end of the feeding conveying device 4 is connected to the feeding end of the coating device 2, and the conveying direction of the feeding conveying device 4 is the first direction. The feeding conveying device 4 can be any device capable of conveying the substrate 100 in the prior art, and the specific structure is the prior art, which will not be described here.

[0060] From the above, after the substrate 100 in the first baking oven 12 is baked, the substrate 100 is turned over by the first turnover manipulator 13 to the feeding end of the feeding conveying device 4, and the substrate 100 is conveyed at the same time to realize the heat dissipation of the substrate 100, thereby improving the heat dissipation efficiency of the substrate 100, and then the substrate 100 is conveyed to the coating device 2 for coating.

[0061] As preferred, the feeding conveying device 4 in the embodiment is preferably an air floating conveyor, so as to play a protective effect on the substrate 100 during conveying the substrate 100, and the airflow generated during the operation of the air floating conveyor can assist in cooling the substrate 100, thereby further improving the heat dissipation efficiency of the substrate 100.

[0062] Reference Fig. 2 and Fig. 3Specifically, the coating device 2 comprises a conveying line 21 and a plurality of coating assemblies 22 arranged above the conveying line 21 in a first direction. Each coating assembly 22 is capable of coating a surface of the substrate 100 with a coating material. The coating materials coated by the plurality of coating assemblies 22 can be the same or different. By arranging the plurality of coating assemblies 22, one layer or multiple layers of coating material can be coated on the surface of the substrate 100 at one time, and the coating material coated each time can be the same or different, thereby meeting the requirements of single-layer coating, multi-layer coating, single-time multi-layer coating, and multi-time single-layer coating, and the production line does not need to be equipped for each coating material, thereby saving cost, improving efficiency, and improving quality.

[0063] For example, the conveying line 21 comprises a conveying frame 211, a plurality of conveying tracks 212 arranged on the conveying frame 211 in a second direction, and a plurality of carriers 213. In some embodiments, the number of the conveying tracks 212 can be three, four, or more.

[0064] Each carrier 213 is slidably connected to each conveying track 212. For example, one carrier 213 is connected to each conveying track 212. The plurality of carriers 213 arranged in the second direction can cooperate to carry the substrate 100. For example, the number of the carriers 213 is two, and each carrier 213 is connected to a set of supporting seats 2131. The supporting seats 2131 in each set of supporting seats 2131 are distributed in the first direction. For example, two supporting seats 2131 are arranged in the first direction. The four supporting seats 2131 can support the four corners of the substrate 100, thereby improving the stability of the substrate 100.

[0065] Each coating assembly 22 comprises a coating frame 221 and a coating knife head 222. The coating frame 221 is connected to the conveying frame 211. Each coating frame 221 comprises two frame bodies arranged in the second direction. The coating knife head 222 is a slit knife head. The coating knife head 222 is arranged between the two frame bodies in the second direction. The inside of the coating knife head 222 is connected to a corresponding barrel (not shown in the figure) through a pipeline. The coating port of the coating knife head 222 is located at the bottom of the coating knife head 222. In addition, the two ends of the coating knife head 222 are slidably connected to the frame bodies in the vertical direction, thereby adjusting the height of the coating knife head 222 to control the thickness of the coating. In some embodiments, the sliding of the coating knife head 222 is driven by an electric screw. In other embodiments, the sliding of the coating knife head 222 can be driven by a cylinder or other linear driving element.

[0066] Further, the outfeed end of the conveying line 21 is provided with a second transfer robot 31, the drying device 3 is located at the side of the second transfer robot 31, and the drying device 3 and the second transfer robot 31 are distributed along a second direction. In this embodiment, the drying device 3 is taken as an example of a VCD drying box, and in other embodiments, the drying device 3 can also be other devices capable of drying the substrate 100.

[0067] The coating production line further includes a second baking oven 32 and a reverse flow conveying device 5. The second baking oven 32 is located at the side of the second transfer robot 31 away from the coating device 2, and the side of the second baking oven 32 away from the coating device 2 is provided with a third transfer robot 33.

[0068] Based on the above, after the substrate 100 is coated, the substrate 100 can be transferred to the drying device 3 by the second transfer robot 31 for drying according to process needs, and then the substrate 100 can be transferred to the second baking oven 32 by the third transfer robot 33 for baking, so that the coating on the substrate 100 can be quickly dried. In addition, drying first and then baking can remove most of the water in the coating, laying a foundation for the subsequent baking process, which can accelerate the baking rate, and after removing most of the water through preliminary drying, the energy and time required for the baking process will be reduced, thereby reducing energy consumption.

[0069] Further, the reverse flow conveying device 5 is located at the side of the coating device 2, and the reverse flow conveying device 5 can convey the substrate 100 at the outfeed end of the coating device 2 or the substrate 100 at the outfeed end of the drying device 3 to the infeed end of the coating device 2. Specifically, the inlet end of the reverse flow conveying device 5 is connected to the third transfer robot 33, the inlet end of the reverse flow conveying device 5 is connected to the outfeed end of the infeed conveying device 4, and the outfeed end of the reverse flow conveying device 5 is provided with a fourth transfer robot 51. By setting the reverse flow conveying device 5, the substrate 100 that needs to be coated again can be transferred to the reverse flow conveying device 5 by the second transfer robot 31 or the third transfer robot 33, so that the reverse flow conveying device 5 conveys the substrate 100 to the infeed end of the coating device 2, and the fourth transfer robot 51 transfers the substrate 100 to the outfeed end of the infeed conveying device 4. In this process, other substrates 100 can continue to be coated by passing under the coating knife head 222, thereby improving work efficiency and accelerating the coating pace.

[0070] As a preferred, the specific structure of the reverse flow conveying device 5 is set with reference to the specific structure of the infeed conveying device 4. The second transfer robot 31, the third transfer robot 33, and the fourth transfer robot 51 are all set with reference to the first transfer robot 13.

[0071] Based on the above, the coating device 2 of the embodiment has three coating heads 222 in total, and at most three types of coating materials can be applied to the surface of the substrate 100 at a time. The following will illustrate four operation modes, i.e., single-time multi-layer coating, single-time single-layer coating, multi-time multi-layer coating, and multi-time single-layer coating:

[0072] Single-time multi-layer coating mode: if three types of coating materials are applied to the surface of the substrate 100 at a time, when the substrate 100 is conveyed to the position below the coating heads 222, the three coating heads 222 simultaneously apply coating materials to the upper surface of the substrate 100 to achieve three-layer coating, and then the substrate 100 is sequentially conveyed into the drying device 3 and the second baking oven 32 to complete the coating operation.

[0073] Single-time single-layer coating mode: if only one type of coating material is applied to the surface of the substrate 100 at a time, when the substrate 100 is conveyed to the position below the coating heads 222, one of the coating heads 222 applies coating material to the upper surface of the substrate 100, and then the substrate 100 is sequentially conveyed into the drying device 3 and the second baking oven 32 to complete the coating operation. It is worth noting that this mode is compatible with the coating requirements of three types of substrates 100, and the coating materials applied to each type of substrate 100 are different, thereby improving the adaptability of the coating production line and meeting the production requirements of three types of products.

[0074] Multi-time multi-layer coating mode: if two types of coating materials are applied to the surface of the substrate 100 at the first time and one type of coating material is applied to the surface of the substrate 100 at the second time, the two coating heads 222 simultaneously apply double-layer coating materials to the upper surface of the substrate 100. At this time, if the second coating needs to wait for the coating material of the first coating to dry before being applied, the substrate 100 after the first coating is dried and baked, and then the substrate 100 is returned to the feeding position of the coating device 2 for the second coating. If the second coating does not need to wait for the coating material of the first coating to dry, the substrate 100 is directly returned to the feeding position of the coating device 2 after the first coating.

[0075] Multi-time single-layer coating mode: the coating is performed in the manner of multi-time multi-layer coating, and the difference lies in that only one type of coating material is applied each time.

[0076] Further, the coating production line further includes a discharge conveying device 6, the feeding end of the discharge conveying device 6 is connected to the third transfer robot 33, the specific structure of the discharge conveying device 6 is set with reference to the specific structure of the feeding conveying device 4, and the discharge end of the discharge conveying device 6 is further provided with a fifth transfer robot 61. When the substrate 100 completes all coating operations, the substrate 100 in the second baking oven 32 is transferred to the feeding end of the discharge conveying device 6 by the third transfer robot 33, so that the substrate 100 is conveyed to the next node for processing by the discharge conveying device 6, and the substrate 100 is transferred by the fifth transfer robot 61.

[0077] Further, the coating production line further comprises a first process equipment 7, a second process equipment 8, a third process equipment 9 and an offline conveying equipment 10 arranged in sequence, specifically, the discharge conveying equipment 6, the fifth transfer mechanical hand 61 and the second process equipment 8 are distributed along the second direction, the first process equipment 7 is located at the side of the fifth transfer mechanical hand 61, and the distribution directions of the first process equipment 7, the second process equipment 8, the third process equipment 9 and the offline conveying equipment 10 are opposite to the conveying direction of the discharge conveying equipment 6. Thus, the whole coating production line is realized to rotate, the length of the coating production line is reduced, and the feeding end and the discharging end of the coating production line are close, which facilitates feeding and discharging.

[0078] As preferred, the first process equipment 7, the second process equipment 8 and the third process equipment 9 in the embodiment are in sequence an exposure machine, an edge exposure machine and a developing machine, that is, the discharge conveying equipment 6, the fifth transfer mechanical hand 61 and the edge exposure machine are distributed along the second direction, and in the second direction, the exposure machine is located between the edge exposure machine and the discharge conveying equipment 6, so that the fifth transfer mechanical hand 61 transfers the substrate 100 from the discharge conveying equipment 6 to the exposure machine, and the substrate 100 in the edge exposure machine can also be transferred to the edge exposure machine. In other embodiments, the selection of the first process equipment 7, the second process equipment 8 and the third process equipment 9 can be adaptively adjusted according to process needs.

[0079] In addition, the third process equipment 9 and the offline conveying equipment 10 are further provided with a sixth transfer mechanical hand 92, and the structure of the sixth transfer mechanical hand 92 refers to the structure of the first transfer mechanical hand 13. The third process equipment 9 is provided with a third baking oven 91 at the side, and the structure of the third baking oven 91 refers to the structure of the first baking oven 12. The substrate 100 can be baked by the third baking oven 91 after being developed, and then conveyed to the discharging end of the offline conveying equipment 10. The offline conveying equipment 10 is any device capable of conveying the substrate 100 in the prior art, and the specific structure is the prior art, which will not be described here.

[0080] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not a limitation on the embodiments of the present application. For those skilled in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present application. Here, it is not necessary and impossible to enumerate all the embodiments. Any modification, equivalent substitution and improvement made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A coating line comprising a cleaning apparatus (1), a coating apparatus (2), and a drying apparatus (3) arranged in this order for sequentially performing cleaning, coating, and drying of a substrate (100), characterized in that, The coating device (2) comprises: a conveying line (21) capable of conveying the substrate (100) in a first direction; and a plurality of coating assemblies (22) disposed above the conveying line (21) in the first direction, each of the coating assemblies (22) being capable of coating a top surface of the substrate (100) with paint, the plurality of coating assemblies (22) coating the same or different paint. The coating production line further comprises: a reverse conveying device (5) located laterally to the coating device (2), the reverse conveying device (5) being capable of conveying the substrate (100) at a discharge end of the coating device (2) or the substrate (100) at a discharge end of the drying device (3) to a feeding end of the coating device (2).

2. The coating line according to claim 1, characterized in that The conveying line (21) comprises: a conveying frame (211); a plurality of conveying tracks (212) disposed on the conveying frame (211) in a second direction perpendicular to the first direction; and a plurality of carriers (213) slidingly disposed on the conveying tracks (212), at least one carrier (213) being disposed on each of the conveying tracks (212), and the plurality of carriers (213) disposed in the second direction being capable of cooperating to carry the substrate (100).

3. The coating line of claim 1, wherein, Each of the coating assemblies (22) comprises: a coating frame (221); and a coating bit (222) disposed on the coating frame (221), a coating opening of the coating bit (222) being located at a bottom of the coating bit (222).

4. The coating line according to claim 3, characterized in that The coating bit (222) is slidingly disposed on the coating frame (221) in a vertical direction.

5. The coating line of claim 1, wherein, A first turnover robot (13) is disposed at a discharge end of the cleaning device (1); The coating production line further comprises: a first baking oven (12) located laterally to the first turnover robot (13), the first turnover robot (13) being capable of transferring the substrate (100) at the discharge end of the cleaning device (1) to the first baking oven (12); and a feeding conveying device (4) located between the first turnover robot (13) and the coating device (2), the first turnover robot (13) being further capable of transferring the substrate (100) inside the first baking oven (12) to a feeding end of the feeding conveying device (4), and a discharge end of the feeding conveying device (4) being docked to the feeding end of the coating device (2).

6. The coating line of claim 1, wherein, A second turnover robot (31) is disposed at a discharge end of the coating device (2), the drying device (3) being located laterally to the second turnover robot (31), the second turnover robot (31) being capable of transferring the substrate (100) at the discharge end of the coating device (2) to the drying device (3); The coating production line further comprises: A second baking oven (32) is located on the side of the second turntable robot (31) away from the coating device (2), and the second turntable robot (31) can also transfer the substrate (100) inside the drying device (3) to the second baking oven (32).

7. The coating line according to claim 6, characterized in that The second baking oven (32) is provided with a third turntable robot (33) on the side away from the coating device (2), and the third turntable robot (33) can move the substrate (100) inside the second baking oven (32) out of the second baking oven (32) and transfer the substrate (100) inside the second baking oven (32) to the reverse flow conveying device (5). The discharge end of the reverse flow conveying device (5) is provided with a fourth turntable robot (51), and the second turntable robot (31) is used to transfer the substrate (100) at the discharge end of the reverse flow conveying device (5) to the feeding end of the coating device (2).

8. The coating line according to claim 7, characterized in that The coating production line further comprises: A discharge conveying device (6) whose feeding end is connected to the third turntable robot (33), and the third turntable robot (33) can also transfer the substrate (100) inside the second baking oven (32) to the feeding end of the discharge conveying device (6).

9. The coating line according to claim 8, characterized in that The coating production line further comprises: A first process device (7) and a second process device (8) are sequentially arranged at the discharge end of the discharge conveying device (6).

10. The coating line according to claim 9, characterized in that The distribution directions of the first process device (7) and the second process device (8) are opposite to the first direction.

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