A coating device and a coating method for conductive paste

Abstract

The application is suitable for the field of coating technology, and provides a coating device and a coating method for conductive paste, which comprises a frame, a conveying assembly mounted on the top of the frame, a coating assembly and a feeding assembly, the feeding assembly is located between the coating assemblies, the coating assembly comprises two vertical plates mounted on the top of the frame and a driving roller and a coating roller arranged on the top of the frame, the device solves the problems that the residual paste in the hopper is difficult to completely empty due to the shape of the inner wall and the viscosity of the paste, residual dead angles are easily formed, the hopper needs to be disassembled after the paste is basically discharged, and forced disassembly will cause material waste and pollution of the equipment and the working environment, the hopper is designed as an L shape, two sets of blocking mechanisms are combined, and a container for independently bearing the conductive paste is constructed, in addition, the hopper is not in direct contact with the coating roller, so that the hopper can be quickly disassembled, and the residual paste can be removed without waiting for the residual paste to be emptied, thereby effectively reducing material waste and environmental pollution.

Description

Technical Field

[0001] This invention relates to the field of coating technology, and more specifically, to a coating apparatus and method for conductive pastes. Background Technology

[0002] Conductive paste is a paste-like composite material composed of conductive functional phases, binders, solvents and additives. It can be coated onto the surface of a substrate through processes such as coating, and after drying or sintering, it forms a conductive layer to realize current transmission or signal conduction.

[0003] Currently, in the existing coating process, conductive slurry is injected into a special hopper, and the coating roller is attached to the edge of the hopper to form a closed space. Under the action of gravity and slight pressure inside the hopper, the slurry slowly adheres to the outer wall of the coating roller to form an initial slurry film. Subsequently, the coating roller rotates stably at a preset speed, and the slurry carried on its outer wall is evenly transferred to the surface of the substrate when it comes into contact with the substrate, thus achieving continuous and stable coating.

[0004] However, during the coating process, the conductive paste comes into direct contact with the coating roller and is easily affected by its own fluidity and viscosity changes. This results in an uneven coating thickness on the substrate surface. Furthermore, due to the connection between the hopper and the equipment structure, the paste in the hopper must first be discharged. However, in actual operation, due to the shape of the inner wall of the hopper (such as corners and seams) and the viscosity of the paste itself, it is difficult to completely remove the residual paste by simply discharging it. Especially in the gap where the hopper and the coating roller are in contact, it is very easy to form dead corners of paste residue. Secondly, the hopper can only be disassembled for deep cleaning after the paste has been basically discharged. If it is forcibly disassembled, the remaining conductive paste in the hopper will drip due to the loss of restraint, which not only wastes materials but also contaminates the equipment surface and the working environment. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a coating device and coating method for conductive paste.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a coating device for conductive paste, comprising a frame, a conveying assembly, a coating assembly, and a feeding assembly mounted on the top of the frame.

[0007] The coating assembly includes two upright plates mounted on the top of the frame, and a drive roller and a coating roller disposed on the top of the frame. The coating roller and the drive roller are arranged side by side, and the coating roller is rotatably connected between the two upright plates.

[0008] The feeding assembly includes two fixed plates installed on the top of the frame, the two fixed plates being located between two upright plates, and a hopper being inclinedly arranged between the two fixed plates. An electric roller is rotatably connected inside the hopper. Two sets of blocking mechanisms are provided on the top of the hopper, and a scraping mechanism is inclinedly arranged on the top of the two sets of blocking mechanisms. A spraying mechanism is slidably connected to the bottom of the scraping mechanism.

[0009] The present invention is further configured such that: the conveying assembly includes two second supports and two first supports installed sequentially on the top of the frame; a roller is rotatably connected between the two second supports; a pressure roller and a bearing roller are rotatably connected between the two first supports; the pressure roller is located between the roller and the bearing roller; and the bearing roller is positioned close to the drive roller; a limiting plate is installed between the two first supports; the limiting plate is located above the bearing roller; and a gap is provided between the limiting plate and the bearing roller.

[0010] By adopting the above technical solution, when the substrate is fed, it is placed sequentially under the idler roller, between the drive roller and the coating roller, between the limiting plate and the bearing roller, and under the pressure roller. After placement, the drive roller rotates to transport the substrate. The substrate is fed in the direction of the idler roller, passes between the drive roller and the coating roller, and is then sent out between the limiting plate and the bearing roller and under the pressure roller.

[0011] The invention is further configured such that: two sets of guide rails are installed on the top of the frame, and a first cylinder is installed on the top of each of the two guide rails. A first slider is installed on the piston rod of the first cylinder. The bottom of the first slider is slidably connected to the top of the corresponding guide rail. A mounting seat is installed on one of the upright plates and the side wall of the first slider on the same side. A servo motor is installed on one side of the mounting seat. The output end of one servo motor passes through the upright plate and is connected to one end of the coating roller. The output end of the other servo motor passes through the corresponding first slider and is connected to one end of the drive roller.

[0012] The invention is further configured such that: a second cylinder is vertically mounted downward on the top of the two upright plates, the piston rod of the second cylinder is connected to a second slider, and a roller scraper is mounted between the two second sliders.

[0013] By adopting the above technical solution, the second cylinder pushes the second slider to move up and down, thereby adjusting the height of the roller doctor blade. When there is too much conductive slurry on the surface of the coating roller, the height of the roller doctor blade is controlled to scrape the conductive slurry on the surface of the coating roller, thereby controlling the amount of conductive slurry on the surface of the coating roller. The roller doctor blade is cylindrical in shape, and a doctor blade is set on the outer wall of the cylinder. When the doctor blade moves down, the gap between it and the surface of the coating roller decreases, thereby scraping off the conductive slurry.

[0014] The present invention is further configured such that: both sets of blocking mechanisms include a U-shaped plate sleeved on one side of the hopper, a placement block is connected to the side of the U-shaped plate near the hopper, the bottom and side wall of the placement block are in contact with the inner wall of the hopper, an arc groove is opened on the top of the placement block, the outer wall of the electric roller is embedded in the inside of the arc groove, and two contour blocks are installed on the top of the placement block.

[0015] The present invention is further configured such that: the scraping mechanism includes a scraper, the top of the scraper is provided with a through groove, and two locking blocks are slidably connected inside the through groove. The two locking blocks are correspondingly arranged with two U-shaped plates. The locking blocks are sleeved on the top of the corresponding U-shaped plates. Each locking block is threaded with a locking bolt at its top. The locking bolt is located above the scraper, and the diameter of the bolt head is greater than the width of the through groove.

[0016] The present invention is further configured such that: a plurality of S-shaped guide plates are provided at the bottom of the scraper to form an S-shaped flow channel; a groove is provided at the bottom of the scraper; a locking plate is provided above the scraper; a gap is provided between the scraper and the locking plate; screws are threadedly connected to the top of the scraper at both ends of the locking plate; and one end of the S-shaped guide plate penetrates the interior of the groove and extends to the top of the scraper and into the gap between the scraper and the locking plate.

[0017] The present invention is further configured such that: the spraying mechanism includes an electric slide block slidably connected inside the through groove, a spraying head is installed at the bottom of the electric slide block, the end of the spraying head extends to the outer wall of the electric roller, and the spraying head is inclined.

[0018] The invention is further configured such that: the top of each of the two fixing plates is provided with an arc groove, both ends of the electric roller are placed inside the arc groove, the top of each fixing plate is provided with a pressure plate, the top of the pressure plate is provided with two auxiliary bolts, and the bottom end of the auxiliary bolts is threadedly connected to the top end of the corresponding fixing plate.

[0019] A limiting groove is provided above one of the two fixed plates on opposite sides, and the side wall of the hopper is inserted into the corresponding limiting groove. A placement groove is provided below one of the two fixed plates on opposite sides, and a horizontal plate is inserted into the two placement grooves.

[0020] By adopting the above technical solutions, the hopper is designed in an L-shape and combined with two sets of blocking mechanisms to form an independent carrying container. Since the hopper has no direct contact with the coating roller, it can be quickly disassembled without waiting for residual slurry to be emptied, reducing material waste and environmental pollution. An electric roller is installed inside the hopper; its rotation causes the slurry to fluctuate and complete the material handling and transfer, avoiding leakage problems caused by direct contact between the hopper and the coating roller, while also reducing the deposition of conductive particles. An inclined spraying mechanism is set up and slides below the scraping mechanism, allowing the slurry to be injected at an angle into the surface of the electric roller and dispersed by collision, overcoming the pollution and wear problems caused by long-term immersion of the nozzle and preventing the accumulation of high-density conductive particles at the bottom of the hopper due to local eddies. Multiple S-shaped guide plates are set at the bottom of the scraping mechanism to form an S-shaped flow channel, dispersing, guiding, and impacting excess slurry scraped by the scraper, alleviating slurry accumulation at the bottom of the scraper and making the slurry more evenly dispersed.

[0021] A coating method for conductive paste, using a coating apparatus for conductive paste as described above, includes the following steps:

[0022] S1. Place the substrate through the inside of the conveying assembly and coating assembly and keep it stationary. Adjust the scraping mechanism and blocking mechanism, and connect the external liquid supply device to the feed port of the spraying mechanism.

[0023] S2. The spraying mechanism sprays conductive slurry onto the outer wall of the electric roller, and the conductive slurry flows downward into the interior of the hopper for later use.

[0024] S3. The electric roller begins to rotate slowly, carrying the conductive paste. At the same time, the coating assembly starts to operate, the substrate is transported smoothly, and the conductive paste is brought to the position of the coating assembly by the electric roller. The coating assembly then applies the conductive paste to the surface of the substrate to form a coating.

[0025] In summary, this application includes at least one of the following beneficial technical effects:

[0026] (1) By designing the hopper as an L-shape and combining it with two sets of blocking mechanisms, a container for independently carrying conductive slurry is constructed. In addition, there is no direct contact between the hopper and the coating roller, thus enabling the hopper to be quickly disassembled without waiting for the residual slurry to be emptied, effectively reducing material waste and environmental pollution.

[0027] (2) By setting an electric roller in the hopper, and the rotation of the electric roller can cause the conductive slurry in the hopper to fluctuate, the electric roller will acquire and transfer the conductive slurry to the coating roller, thus avoiding the leakage problem caused by direct contact between the hopper and the coating roller, and reducing the deposition of conductive particles in the conductive slurry.

[0028] (3) By setting an inclined spraying mechanism and letting it slide below the scraping mechanism, the conductive slurry is injected into the surface of the electric roller at an inclination, causing the conductive slurry to collide and disperse with the rotating electric roller, thus overcoming the problem of long-term immersion, contamination and wear of the nozzle, and at the same time achieving the effect of preventing the local accumulation of high-density conductive particles at the bottom of the hopper due to local eddies.

[0029] (4) By setting multiple S-shaped guide plates at the bottom of the scraping mechanism to form an S-shaped flow channel, the excess slurry scraped off by the scraper is dispersed, guided and impacted, thus alleviating the accumulation of slurry at the bottom of the scraper and making the slurry more evenly dispersed. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of a coating device for conductive paste according to the present invention.

[0031] Figure 2 for Figure 1 A schematic diagram of a local structure from another perspective.

[0032] Figure 3 This is a schematic diagram of the feeding component structure in this invention.

[0033] Figure 4 for Figure 3 Another perspective structural diagram.

[0034] Figure 5 for Figure 4 Schematic diagram of the exploded structure.

[0035] Figure 6 This is a schematic diagram of the blocking mechanism in this invention.

[0036] Figure 7 This is a schematic diagram of the cooperative structure of the scraping mechanism and the blocking mechanism in this invention.

[0037] Figure 8 This is a schematic diagram of the combined structure of the S-shaped guide plate, the nozzle, and the electric roller in this invention.

[0038] Figure 9 This is a schematic diagram of the cooperative structure of the scraper and the spray head in this invention.

[0039] Figure 10 for Figure 9 Schematic diagram of the structure cut along the AA section line.

[0040] Figure 11 for Figure 9 Schematic diagram of the three-dimensional structure.

[0041] Figure 12 for Figure 11 A schematic diagram of a partial structure viewed from below.

[0042] Explanation of reference numerals in the attached diagram: 1. Frame;

[0043] 2. Conveying assembly; 21. First support; 22. Pressure roller; 23. Second support; 24. Idler roller; 25. Bearing roller; 26. Limiting plate;

[0044] 3. Coating assembly; 31. Vertical plate; 32. Roller blade; 33. Mounting base; 34. Servo motor; 35. Drive roller; 36. First cylinder; 37. First slider; 38. Second cylinder; 39. Second slider; 301. Coating roller; 302. Guide rail;

[0045] 4. Feeding assembly; 41. Fixing plate; 42. Hopper; 43. Electric roller; 44. Auxiliary bolts; 45. Pressure plate;

[0046] 46. ​​Scraping mechanism; 461. Scraper; 462. Through groove; 463. Locking block; 464. Slide groove; 465. S-shaped guide plate; 466. Locking bolt; 467. Locking plate;

[0047] 47. Blocking mechanism; 471. U-shaped plate; 472. Placement block; 473. Contouring block; 474. Arc groove;

[0048] 48. Spraying mechanism; 481. Electric slide; 482. Spraying head;

[0049] 49. Horizontal plate; 401. Limiting groove; 402. Placement groove. Detailed Implementation

[0050] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0051] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0052] Please see Figures 1-12 The present invention provides the following technical solutions:

[0053] Example 1, see Figure 1 A coating apparatus for conductive paste includes a frame 1, a conveying assembly 2 and a coating assembly 3 mounted on top of the frame 1. The conveying assembly 2 is used to support and guide the substrate, while the coating assembly 3 is used to smoothly convey and coat the substrate. The specific structures of the conveying assembly 2 and the coating assembly 3 are as follows:

[0054] See Figure 1 and Figure 2The coating assembly 3 includes two upright plates 31 mounted on the top of the frame 1, and a drive roller 35 and a coating roller 301 disposed on the top of the frame 1. The coating roller 301 and the drive roller 35 are arranged side by side, and the coating roller 301 is rotatably connected between the two upright plates 31. When the substrate is coated, it passes between the drive roller 35 and the coating roller 301, and the substrate is wrapped around the outer wall of the drive roller 35. The coating roller 301 can then coat the conductive paste onto the surface of the wrapped substrate.

[0055] See Figure 1 and Figure 2 The conveying assembly 2 includes two second brackets 23 and two first brackets 21 sequentially installed on the top of the frame 1. A roller 24 is rotatably connected between the two second brackets 23. A pressure roller 22 and a bearing roller 25 are rotatably connected between the two first brackets 21. The pressure roller 22 is located between the roller 24 and the bearing roller 25, and the bearing roller 25 is positioned close to the drive roller 35. A limiting plate 26 is installed between the two first brackets 21. The limiting plate 26 is located above the bearing roller 25, and a gap is provided between the limiting plate 26 and the bearing roller 25. The roller 24, the pressure roller 22, and the bearing roller 25 cooperate to guide and convey the substrate.

[0056] Specifically, when the substrate is fed, it is placed sequentially under the idler roller 24, between the drive roller 35 and the coating roller 301, between the limiting plate 26 and the bearing roller 25, and under the pressure roller 22. After placement, the drive roller 35 rotates to transport the substrate. The substrate is fed in the direction of the idler roller 24, passes between the drive roller 35 and the coating roller 301, and is then discharged between the limiting plate 26 and the bearing roller 25 and under the pressure roller 22.

[0057] See Figure 1 and Figure 2 Two sets of guide rails 302 are installed on the top of the frame 1. A first cylinder 36 is installed on the top of each guide rail 302. A first slider 37 is installed on the piston rod of the first cylinder 36. The bottom of the first slider 37 is slidably connected to the top of the corresponding guide rail 302. A drive roller 35 is rotatably connected between the two first sliders 37. The first cylinder 36 is used to drive the corresponding first slider 37 to slide above the corresponding guide rail 302, thereby adjusting the position of the drive roller 35. There is a gap between the drive roller 35 and the coating roller 301. This gap changes synchronously with the change of the position of the drive roller 35.

[0058] See Figure 1 and Figure 2One of the upright plates 31 and the side wall of the first slider 37 on the same side are equipped with mounting bases 33. A servo motor 34 is installed on one side of the mounting base 33. The output end of one servo motor 34 passes through the upright plate 31 and is connected to one end of the coating roller 301. The output end of the other servo motor 34 passes through the corresponding first slider 37 and is connected to one end of the drive roller 35. The servo motor 34 is used to drive the corresponding drive roller 35 or coating roller 301 to rotate. The drive roller 35 and coating roller 301 rotate in the same direction. When the substrate needs to be conveyed, the drive roller 35 rotates to convey the substrate, while the conductive paste is applied to the surface of the coating roller 301. During the rotation process, the coating roller 301 rolls the conductive paste onto the surface of the substrate.

[0059] See Figure 1 and Figure 2 Two vertically downward-facing cylinders 38 are mounted on the top of the two upright plates 31. The piston rod of the two cylinders 38 is connected to a second slider 39. A roller scraper 32 is installed between the two second sliders 39. The cylinders 38 are used to push the second sliders 39 up and down, thereby adjusting the height of the roller scraper 32. When there is too much conductive paste on the surface of the coating roller 301, the excess paste will gradually migrate to the gap between the coating roller 301 and the drive roller 35 during the operation of the equipment. Since the two are in a state of relative motion during operation... Due to limited space, the excess slurry cannot be transferred to the substrate in time through the normal coating process, and will accumulate in the contact area, forming obvious slurry accumulation. By controlling the height of the roller doctor blade 32, the conductive slurry on the surface of the coating roller 301 is scraped, thereby controlling the amount of conductive slurry on the surface of the coating roller 301. The roller doctor blade 32 is cylindrical in shape, and a scraper is set on the outer wall of the cylinder. When the scraper moves down, the gap between it and the surface of the coating roller 301 decreases, thereby scraping off the conductive slurry.

[0060] See Figure 1 The top of the frame 1 is equipped with a feeding assembly 4. The conductive paste on the outer wall of the coating roller 301 is fed by the feeding assembly 4. The specific structure of the feeding assembly 4 is as follows:

[0061] See Figure 1 , Figures 3-5The feeding assembly 4 includes two fixed plates 41 installed on the top of the frame 1. The two fixed plates 41 are located between two upright plates 31. A hopper 42 is inclinedly arranged between the two fixed plates 41. The two fixed plates 41 cooperate to provide auxiliary support for the hopper 42. A limiting groove 401 is opened above the opposite side of the two fixed plates 41. The side wall of the hopper 42 is inserted into the corresponding limiting groove 401. The limiting groove 401 limits the hopper 42. Moreover, the limiting groove 401 is inclined. When the side wall of the hopper 42 is inserted into the limiting groove 401, the hopper 42 is in an inclined state. When the conductive slurry is injected into the hopper 42, the hopper 42 carries the conductive slurry.

[0062] See Figures 3-5 The two fixed plates 41 have a placement groove 402 on the lower side of opposite sides. A horizontal plate 49 is inserted inside the two placement grooves 402. The horizontal plate 49 is used to provide auxiliary support for the hopper 42.

[0063] The hopper 42 has an opening on one side near the coating roller 301. The conductive slurry inside the hopper 42 flows towards the coating roller 301 through the opening. The conductive slurry is in direct contact with the coating roller 301. When the coating roller 301 rotates, it picks up the conductive slurry and continuously coats it onto the surface of the substrate, thereby completing the coating operation.

[0064] See Figures 4-5 The top of the hopper 42 is provided with two sets of blocking mechanisms 47. The two sets of blocking mechanisms 47 are used to limit the width of the coating. Before coating, the operator first manually adjusts the position of the blocking mechanisms 47 to change the width between the two sets of blocking mechanisms 47. After the adjustment is completed, the conductive paste is injected into the position between the two sets of blocking mechanisms 47 and accumulates inside the hopper 42. Then the conductive paste is fed into the coating roller 301 through the opening.

[0065] See Figure 6 The two sets of blocking mechanisms 47 have the following structures:

[0066] Both sets of blocking mechanisms 47 include a U-shaped plate 471 fitted onto one side of the hopper 42. A placement block 472 is connected to the side of the U-shaped plate 471 closest to the hopper 42. When installing the blocking mechanism 47, the operator first fits the U-shaped plate 471 onto the side wall of the hopper 42. At this time, the bottom and side wall of the placement block 472 are in contact with the inner wall of the hopper 42. Then, the positions of the two U-shaped plates 471 on the side wall of the hopper 42 are adjusted, and the position of the U-shaped plates 471 is measured with a ruler. The U-shaped plates 471 are locked with screws. The distance between the two U-shaped plates 471 is the width of the coating.

[0067] After adjustment, the conductive slurry is injected into the position between the two placement blocks 472 and accumulates inside the hopper 42. Then, the conductive slurry is fed by contacting the coating roller 301 through the opening.

[0068] In the second embodiment, in the existing coating method, due to the correlation between the hopper 42 and the equipment structure, the conductive slurry inside the hopper 42 directly contacts the outer wall of the coating roller 301, and the rotation of the coating roller 301 is used to pick up the material and coat it.

[0069] After coating is completed, due to the shape of the inner wall of the hopper 42 (such as corners and seams) and the viscosity of the slurry itself, it is difficult to completely remove the residual slurry by simply discharging it. Especially in the gap where the hopper 42 and the coating roller 301 are in contact, it is easy to form dead corners of slurry residue. Secondly, the hopper 42 can only be disassembled for deep cleaning after the slurry has been basically discharged. If it is forcibly disassembled, the remaining conductive slurry in the hopper 42 will drip down due to the loss of restraint, which will not only waste materials, but also contaminate the surface of the equipment and the working environment.

[0070] Therefore, further improvements were made to hopper 42, see [reference]. Figure 4 and Figure 5 When the hopper 42 is set to an L-shape, the coating roller 301 does not directly contact the conductive slurry and the hopper 42. The hopper 42 and the two sets of blocking mechanisms 47 work together to form a container that can independently hold the conductive slurry.

[0071] See Figure 4 and Figure 5 An electric roller 43 is rotatably connected inside the hopper 42. The top of each of the two fixed plates 41 is provided with an arc groove. Both ends of the electric roller 43 are placed inside the arc groove. Each fixed plate 41 is provided with a pressure plate 45 on its top. Two auxiliary bolts 44 are threaded through the top of the pressure plate 45. The bottom end of the auxiliary bolts 44 is threaded to the top end of the corresponding fixed plate 41. Before installation, the two ends of the electric roller 43 are first sunk into the arc groove, and then the pressure plate 45 and auxiliary bolts 44 are used to complete the limiting installation.

[0072] When the electric roller 43 is submerged inside the hopper 42, in order to ensure that the blocking mechanism 47 can function properly, the top of the placement block 472 is provided with an arc-shaped groove 474. The outer wall of the electric roller 43 is embedded inside the arc-shaped groove 474. Two contour blocks 473 are installed on the top of the placement block 472. Before the electric roller 43 is installed into the hopper 42, the blocking mechanism 47 is first installed onto the hopper 42. After that, when the electric roller 43 is installed, both ends of the electric roller 43 are limited by the pressure plate 45. The outer wall of the electric roller 43 is submerged in the arc-shaped groove 474. When the operator adjusts the position of the blocking mechanism 47, the placement block 472 can slide along the outer wall of the electric roller 43 through the arc-shaped groove 474. There will be no interference between the electric roller 43 and the blocking mechanism 47. The two contour blocks 473 can cover the outer wall of the electric roller 43, and a sealing element is provided inside the arc-shaped groove 474 to prevent material leakage.

[0073] After the conductive slurry is injected into the hopper 42, the electric roller 43 is immersed in the conductive slurry inside the hopper 42. The electric roller 43 rotates to pick up the conductive slurry and transfer it to the coating roller 301. If the coating is completed, the hopper 42 can be removed directly without considering whether there is conductive slurry in the hopper 42, and there is no need to wait for the residual slurry to be completely emptied. The hopper 42 can be cleaned after it is removed, and the coating roller 301 can be cleaned at the same time.

[0074] During rotation, the electric roller 43 can not only acquire and transfer the conductive slurry, but also cause the conductive slurry accumulated in the hopper 42 to fluctuate, reducing the deposition of conductive particles in the conductive slurry.

[0075] In addition, in the existing method, when the coating roller 301 is in direct contact with the hopper 42, uneven contact pressure can easily lead to material leakage. However, by using the electric roller 43 to pick up the material, the hopper 42 and the coating roller 301 are not in direct contact, and there is no need to set a sealing material between them, thus overcoming the problem of material leakage between the hopper 42 and the coating roller 301.

[0076] In Example 3, the existing injection method usually involves injecting material vertically downwards into the hopper 42 using a nozzle. The end of the nozzle is immersed in the conductive slurry and reciprocates to achieve uniform conductive particles in the conductive slurry. However, in this method, the nozzle is easily contaminated and worn by solid particles in the slurry due to long-term immersion. At the same time, the combination of vertical injection and reciprocating motion may form local eddies, which may cause conductive particles with higher density to accumulate locally at the bottom of the hopper 42, especially when the slurry viscosity is high.

[0077] To this end, the conductive slurry is first fluctuated by rotating the electric roller 43 inside the hopper 42, which reduces the deposition of conductive particles in the conductive slurry to a certain extent.

[0078] To further reduce the deposition of conductive particles in conductive pastes, refer to... Figures 3-12 A scraping mechanism 46 is inclinedly arranged on the top of the two sets of blocking mechanisms 47. A spraying mechanism 48 is slidably connected to the bottom of the scraping mechanism 46. The spraying mechanism 48 is set at an inclination angle so that the conductive paste can be inclinedly injected onto the surface of the electric roller 43. While the electric roller 43 is rotating, the injected conductive paste collides with the rotating electric roller 43, and the spraying mechanism 48 slides below the scraping mechanism 46, thereby dispersing the conductive paste during injection. Then, the electric roller 43 lifts the conductive paste for use.

[0079] See Figures 3-12 The scraping mechanism 46 includes a scraper 461. A through groove 462 is provided on the top of the scraper 461. Two locking blocks 463 are slidably connected inside the through groove 462. The two locking blocks 463 are correspondingly arranged with two U-shaped plates 471. The locking blocks 463 are sleeved on the top of the corresponding U-shaped plates 471. Each locking block 463 has a locking bolt 466 threadedly connected to its top. The locking bolt 466 is located above the scraper 461, and the diameter of the screw head of the locking bolt 466 is larger than the width of the through groove 462.

[0080] After the two sets of blocking mechanisms 47 are adjusted, the staff adjusts the position of the sliding block 463 inside the through groove 462 according to the width between the two U-shaped plates 471. The two blocks 463 are respectively locked on the top of the two U-shaped plates 471. Then, the position of the blocks 463 is fixed by the locking bolts 466, and the scraper 461 is positioned and installed.

[0081] See Figure 7 and Figure 8 The spraying mechanism 48 includes an electric slide 481 slidably connected inside the through groove 462. A spraying head 482 is installed at the bottom of the electric slide 481. The end of the spraying head 482 extends to the outer wall of the electric roller 43 and is inclined. The electric slide 481 consists of a housing, a drive motor, and four wheels. The drive motor drives one wheel. When the electric slide 481 needs to move, the drive motor drives the corresponding wheel to rotate. The wheel moves along the inner wall of the through groove 462 and drives the housing to move as a whole. The other three wheels assist in the movement.

[0082] When the electric slide 481 moves, it drives the nozzle 482 to move synchronously. Since the end of the nozzle 482 extends to the outer wall of the electric roller 43 and the nozzle 482 is inclined, an external liquid supply device is connected to the inlet of the nozzle 482. The external liquid supply device consists of a storage tank, a pump body, and pipelines, which are not specifically limited here. The external liquid supply device delivers the conductive slurry into the nozzle 482, and the nozzle 482 then delivers the conductive slurry to the outer wall of the electric roller 43. As the electric roller 43 rotates, it injects... The conductive slurry enters and collides with the rotating electric roller 43, and the spraying mechanism 48 slides below the scraper 461, thereby dispersing the conductive slurry during injection. That is, by setting the inclined spraying mechanism 48 and making it slide below the scraper mechanism 46, the conductive slurry is injected at an incline onto the surface of the electric roller 43, causing the conductive slurry to collide and disperse with the rotating electric roller 43. This overcomes the problem of long-term immersion, contamination and wear of the nozzle, and at the same time achieves the effect of preventing high-density conductive particles from accumulating locally at the bottom of the hopper 42 due to local eddies.

[0083] The conductive slurry is then lifted out by the electric roller 43 for use.

[0084] After the conductive paste collides with the electric roller 43, some of the paste will flow downwards due to gravity, while some of the paste will be lifted upwards with the electric roller 43. When the lifted paste reaches the position of the scraper 461, the scraper 461 will control the thickness of the paste on the surface of the electric roller 43. That is, the excess paste will be scraped off by the scraper 461. Part of the paste scraped off by the scraper 461 will fall back into the hopper 42, and the other part will accumulate at the bottom of the scraper 461.

[0085] To alleviate the accumulation of slurry at the bottom after being scraped by the scraper 461, multiple S-shaped guide plates 465 are provided at the bottom of the scraper 461 to form an S-shaped flow channel. The S-shaped guide plates 465 are arranged in an S-shape, and an S-shaped flow channel is formed between adjacent S-shaped guide plates 465. When the scraper 461 scrapes off excess conductive slurry from the surface of the electric roller 43, the scraped slurry will flow towards the bottom of the scraper 461, and the multiple S-shaped guide plates 465 will disperse the scraped slurry. Furthermore, the slurry flowing into the S-shaped flow channel is affected by the special shape of the flow channel, causing collisions and impacts, which makes the slurry more evenly dispersed in the S-shaped flow channel. At the same time, the setting of the S-shaped flow channel also increases the efficiency of the slurry during the flow process, alleviating the accumulation of scraped slurry.

[0086] Additionally, see Figures 7-12A groove 464 is provided at the bottom of the scraper 461, and a locking plate 467 is provided above the scraper 461. A gap is provided between the scraper 461 and the locking plate 467. Screws are threadedly connected to the top of the scraper 461 at both ends of the locking plate 467. One end of the S-shaped guide plate 465 passes through the interior of the groove 464 and extends to the top of the scraper 461 and the gap between the scraper 461 and the locking plate 467.

[0087] After determining the positions of the two sets of blocking mechanisms 47, the staff adjusted the positions of multiple S-shaped guide plates 465 so that the multiple S-shaped guide plates 465 were dispersed between the two U-shaped plates 471. The flow guiding function can be achieved without adjusting the same gap between adjacent S-shaped guide plates 465. After the adjustment is completed, the locking plate 467 is pressed on the top of the multiple S-shaped guide plates 465 and locked with screws. The positioned multiple S-shaped guide plates 465 disperse, guide and block the excess slurry scraped off by the scraper 461, and alleviate the accumulation of scraped slurry.

[0088] Example 4: A coating method for conductive paste, using the above-described coating apparatus for conductive paste, includes the following steps:

[0089] S1. Place the substrate through the inside of the conveying assembly 2 and the coating assembly 3 and keep it stationary. Adjust the scraping mechanism 46 and the blocking mechanism 47, and connect the external liquid supply device to the feed port of the spraying mechanism 48.

[0090] The more specific steps in S1 are as follows:

[0091] S11. The substrate is placed sequentially under the support roller 24, between the drive roller 35 and the coating roller 301, between the limiting plate 26 and the bearing roller 25, and under the pressure roller 22.

[0092] S12. Then adjust the position of the two U-shaped plates 471 on the side wall of the hopper 42, measure the position of the U-shaped plates 471 with a ruler, and lock the U-shaped plates 471 with mounting screws. The interval between the two U-shaped plates 471 is the width of the coating.

[0093] S13. Then, adjust the position of the sliding block 463 inside the through groove 462 according to the width between the two U-shaped plates 471. The two blocks 463 are respectively locked on the top of the two U-shaped plates 471. Then, use the locking bolt 466 to fix the position of the blocks 463, thereby positioning the scraper 461.

[0094] S14. Then adjust the position of the multiple S-shaped guide plates 465 so that the multiple S-shaped guide plates 465 are dispersed between the two U-shaped plates 471. After the adjustment is completed, press the locking plate 467 on the top of the multiple S-shaped guide plates 465 and lock it with screws. After the adjustment is completed, connect the external liquid supply device to the feed port of the spray head 482.

[0095] S2. The spraying mechanism 48 sprays conductive slurry onto the outer wall of the electric roller 43, and the conductive slurry flows downward into the interior of the hopper 42 for later use.

[0096] The more specific steps of S2 are as follows:

[0097] S21, the nozzle 482 sprays conductive slurry onto the outer wall of the electric roller 43. The conductive slurry flows down along the arc-shaped outer wall of the electric roller 43 into the interior of the hopper 42 for later use. The nozzle 482 slides between two U-shaped plates 471 driven by the electric slide block 481, thereby ensuring the uniformity of the spray.

[0098] S3. The electric roller 43 starts to rotate slowly, carrying the conductive paste. At the same time, the coating assembly 3 starts to operate, the substrate is transported smoothly, the conductive paste is brought to the position of the coating assembly 3 by the electric roller 43, and the coating assembly 3 applies the conductive paste to the surface of the substrate to form a coating.

[0099] The more specific steps for S3 are as follows:

[0100] S31, the electric roller 43 begins to rotate slowly, carrying the conductive slurry. Affected by the spraying angle of the nozzle 482, the conductive slurry will collide and break up with the rotating electric roller 43. The conductive slurry will move with the rotating electric roller 43. When the conductive slurry moves to the position of the scraper 461, the scraper 461 scrapes off the thicker part of the conductive slurry on the outer wall of the electric roller 43, ensuring that the thickness of the conductive slurry on the outer wall of the electric roller 43 meets the standard.

[0101] When the scraper 461 scrapes off the conductive slurry, the conductive slurry first flows into the gap between multiple S-shaped guide plates 465. Since the S-shaped guide plates 465 are irregularly shaped, the conductive slurry will flow along the flow channel formed between adjacent S-shaped guide plates 465 and collide with the irregularly shaped S-shaped guide plates 465. Then it falls into the interior of the hopper 42, waiting to be picked up again by the rotating electric roller 43.

[0102] S33. At the same time, the drive roller 35 and the coating roller 301 are driven to rotate by their respective servo motors 34, and the coating roller 301 and the drive roller 35 rotate in the same direction. The substrate is transported smoothly, and the conductive paste is brought to the position of the coating roller 301 by the electric roller 43. The electric roller 43 transfers the conductive paste to the outer wall of the coating roller 301, and the coating roller 301 then coats the transferred conductive paste onto the surface of the substrate to form a coating.

[0103] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

Claims

1. A coating apparatus for conductive paste, characterized in that: Includes a frame (1), a conveying assembly (2) mounted on top of the frame (1), a coating assembly (3) and a feeding assembly (4); The coating assembly (3) includes two vertical plates (31) mounted on the top of the frame (1) and a drive roller (35) and a coating roller (301) disposed on the top of the frame (1). The coating roller (301) and the drive roller (35) are arranged side by side, and the coating roller (301) is rotatably connected between the two vertical plates (31). The feeding assembly (4) includes two fixed plates (41) installed on the top of the frame (1). The two fixed plates (41) are located between two upright plates (31). A hopper (42) is inclined between the two fixed plates (41). An electric roller (43) for undulating and transferring conductive paste is rotatably connected inside the hopper (42). Two sets of blocking mechanisms (47) for limiting the coating width are provided on the top of the hopper (42). A scraping mechanism (46) for controlling the amount of conductive paste on the surface of the coating roller (301) is inclinedly provided on the top of the two sets of blocking mechanisms (47). A spraying mechanism (48) is slidably connected to the bottom of the scraping mechanism (46). Both sets of blocking mechanisms (47) include a U-shaped plate (471) sleeved on one side of the hopper (42). A placement block (472) is connected to the side of the U-shaped plate (471) near the hopper (42). The bottom and side wall of the placement block (472) are in contact with the inner wall of the hopper (42). An arc groove (474) is opened on the top of the placement block (472). The outer wall of the electric roller (43) is embedded in the arc groove (474). Two contour blocks (473) are installed on the top of the placement block (472). The scraping mechanism (46) includes a scraper (461), and a through groove (462) is provided on the top of the scraper (461). Two locking blocks (463) are slidably connected inside the through groove (462). The two locking blocks (463) are correspondingly arranged with two U-shaped plates (471). The locking blocks (463) are sleeved on the top of the corresponding U-shaped plates (471). Each locking block (463) has a locking bolt (466) threadedly connected to its top. The locking bolt (466) is located above the scraper (461), and the diameter of the screw head of the locking bolt (466) is greater than the width of the through groove (462). The bottom of the scraper (461) is provided with a plurality of S-shaped guide plates (465) forming an S-shaped flow channel. The bottom of the scraper (461) is provided with a sliding groove (464). A locking plate (467) is provided above the scraper (461). A gap is provided between the scraper (461) and the locking plate (467). Screws are threadedly connected between the two ends of the locking plate (467) and the top of the scraper (461). One end of the S-shaped guide plate (465) passes through the interior of the sliding groove (464) and extends to the top of the scraper (461) and into the gap between the scraper (461) and the locking plate (467). The spraying mechanism (48) includes an electric slide (481) slidably connected inside the through groove (462), with a spray head (482) installed at the bottom of the electric slide (481), the end of the spray head (482) extending to the outer wall of the electric roller (43), and the spray head (482) being inclined.

2. The coating apparatus for conductive paste according to claim 1, characterized in that: The conveying assembly (2) includes two second brackets (23) and two first brackets (21) installed sequentially on the top of the frame (1). A roller (24) is rotatably connected between the two second brackets (23). A pressure roller (22) and a bearing roller (25) are rotatably connected between the two first brackets (21). The pressure roller (22) is located between the roller (24) and the bearing roller (25), and the bearing roller (25) is positioned close to the drive roller (35). A limiting plate (26) is installed between the two first brackets (21). The limiting plate (26) is located above the bearing roller (25), and a gap is provided between the limiting plate (26) and the bearing roller (25).

3. The coating apparatus for conductive paste according to claim 1, characterized in that: Two sets of guide rails (302) are installed on the top of the frame (1). A first cylinder (36) is installed on the top of each of the two guide rails (302). A first slider (37) is installed on the piston rod of the first cylinder (36). The bottom of the first slider (37) is slidably connected to the top of the corresponding guide rail (302). A mounting seat (33) is installed on the side wall of one of the upright plates (31) and the first slider (37) on the same side. A servo motor (34) is installed on one side of the mounting seat (33). The output end of one servo motor (34) passes through the upright plate (31) and is connected to one end of the coating roller (301). The output end of the other servo motor (34) passes through the corresponding first slider (37) and is connected to one end of the drive roller (35).

4. The coating apparatus for conductive paste according to claim 3, characterized in that: A second cylinder (38) is vertically mounted on the top of the two upright plates (31), and the piston rod of the second cylinder (38) is connected to a second slider (39). A roller scraper (32) is installed between the two second sliders (39).

5. The coating apparatus for conductive paste according to claim 1, characterized in that: Both of the two fixing plates (41) have arc grooves on their tops. Both ends of the electric roller (43) are placed inside the arc grooves. Each fixing plate (41) has a pressure plate (45) on its top. Two auxiliary bolts (44) are threaded through the top of the pressure plate (45). The bottom end of the auxiliary bolts (44) is threaded to the top end of the corresponding fixing plate (41). A limiting groove (401) is provided above the opposite side of the two fixed plates (41), and the side wall of the hopper (42) is inserted into the corresponding limiting groove (401). A placement groove (402) is provided below the opposite side of the two fixed plates (41), and a horizontal plate (49) is inserted inside the two placement grooves (402).

6. A coating method for conductive paste, using a coating apparatus for conductive paste as described in any one of claims 1-5, characterized in that, Includes the following steps: S1. Place the substrate through the inside of the conveying assembly (2) and the coating assembly (3) and keep it stationary. Adjust the scraping mechanism (46) and the blocking mechanism (47) and connect the external liquid supply device to the feed port of the spraying mechanism (48). S2, The spraying mechanism (48) sprays conductive slurry onto the outer wall of the electric roller (43), and the conductive slurry flows downward into the interior of the hopper (42) for later use; S3. The electric roller (43) starts to rotate slowly to carry the conductive paste. At the same time, the coating assembly (3) starts to operate, the substrate is transported smoothly, the conductive paste is brought to the position of the coating assembly (3) by the electric roller (43), and the conductive paste is coated on the surface of the substrate by the coating assembly (3) to form a coating.

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