Nano-silver paste coating equipment and coating method

Abstract

The invention discloses nano-silver paste coating equipment and a coating method. The nano-silver paste coating equipment comprises a rack; the conveying mechanism is arranged on the rack, and the conveying mechanism is used for conveying a substrate; the shell is fixedly arranged on the upper side wall of the rack, and a supporting plate is fixedly connected between the inner walls of the two sides of the shell; and the coating spray head is mounted at the center of the lower side wall of the supporting plate. By arranging the collecting mechanism, a collecting shell is automatically opened during coating without influencing the coating work, and is automatically reset after coating is finished, so that residual slurry dripping from a coating nozzle can be effectively collected, slurry waste and workbench pollution are avoided, and the production cost and the cleaning cost are reduced; by means of the limiting mechanism, the substrate can be limited in the conveying process, it is guaranteed that the substrate is located in the center of the conveying belt all the time, deviation of the substrate in the conveying process is effectively avoided, and therefore the coating precision of nano-silver paste is remarkably improved, and the product quality is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of nano silver slurry coating, and in particular to a nano silver slurry coating device and a coating method. Background Art

[0002] Nanosilver paste is a functional composite material composed of nano-sized silver particles as the primary conductive filler, mixed with organic or inorganic binders, solvents, and other ingredients. It exhibits excellent electrical and thermal conductivity and reliability. Nanosilver paste is often used for coating in fields such as PCB substrate manufacturing, which can significantly improve the conductivity of conductors and reduce signal loss. Furthermore, nanosilver coatings can form a continuous conductive network on the substrate surface, providing effective electromagnetic interference shielding and helping to improve the anti-interference capabilities of electronic devices.

[0003] Existing nanosilver slurry coating equipment has some problems during use: On the one hand, after the coating operation is completed, the nanosilver slurry remaining on the nozzle will drip. As a high-performance functional material, nanosilver slurry is relatively expensive. The dripping of slurry directly causes material waste and increases production costs. At the same time, the dripping slurry will contaminate the work surface, not only affecting the cleanliness of the working environment, but also significantly increasing the subsequent cleaning costs and maintenance workload. On the other hand, when the substrate is transported by the conveyor belt, the substrate is prone to deviation on the conveyor belt, making it difficult to ensure that the substrate is in a fixed and accurate position during the coating process, which in turn causes deviations in the coating position, greatly affecting the coating accuracy and product quality, and reducing production efficiency and yield rate. Summary of the Invention

[0004] The main purpose of the present invention is to provide a nano silver slurry coating device and coating method, which can effectively solve the problems in the background technology.

[0005] To achieve the above object, the technical solution adopted by the present invention is: a nano silver slurry coating device, comprising: frame; A conveying mechanism, the conveying mechanism being arranged on the frame and being used for conveying the substrate; A shell, the shell is fixedly arranged on the upper side wall of the frame, and a support plate is fixedly connected between the inner walls on both sides of the shell; A coating nozzle, the coating nozzle being installed at the center of the lower side wall of the support plate; A limiting mechanism, the limiting mechanism being arranged on the frame and being used to limit the substrate during transportation; A collecting mechanism, the collecting mechanism being arranged on the support plate and being used to automatically collect the residual slurry dripping from the coating nozzle after coating is completed; A feeding mechanism is provided on the top of the shell and is used for conveying slurry to the coating nozzle.

[0006] As a further description of the above technical solution, the limiting mechanism includes two electric push rods, which are respectively fixed on the outer walls on both sides of the frame, and the telescopic ends of the electric push rods pass through the side walls of the frame and are fixedly connected to an L-shaped follower plate. Several limiting wheels are rotatably provided on the upper inner wall of the L-shaped follower plate. A guide rod is fixed on the outer wall of one side of the L-shaped follower plate close to the electric push rod and on both sides of the electric push rod. The other end of the guide rod slides through the side wall of the frame and extends to its outside.

[0007] As a further description of the above technical solution, the collecting mechanism includes two fixed plates, which are symmetrically arranged on the lower side wall of the support plate. A rotating shaft is rotatably provided between the two fixed plates. A connecting plate is fixedly sleeved on the rotating shaft, and a collecting shell is installed on the connecting plate. A driven gear is fixedly sleeved on one end of the rotating shaft, and a motor is installed on one side wall of one of the fixed plates. The output shaft of the motor passes through the fixed plate and is fixedly connected to a driving gear that meshes with the driven gear.

[0008] As a further description of the above technical solution, the feeding mechanism includes a storage tank and a metering pump fixedly arranged on the upper outer wall of the shell, the storage tank and the input end of the metering pump are connected through a material delivery pipe, and the output end of the metering pump and the coating nozzle are connected through a material delivery pipe.

[0009] As a further description of the above technical solution, a slot is provided on one side wall of the connecting plate, and two symmetrically distributed shells are fixedly connected to the top wall of the connecting plate. A wedge block is slidably provided in the shell, and the lower end of the wedge block extends into the slot. A reset spring is provided between the upper side wall of the wedge block and the shell, and a U-shaped pull rod is fixed between the upper side walls of the two wedge blocks.

[0010] As a further description of the above technical solution, an insert block adapted to the slot is fixedly connected to the outer wall of the collecting shell close to the connecting plate, and two slots adapted to the wedge block are provided on the upper side wall of the insert block.

[0011] As a further description of the above technical solution, a controller is provided on one side outer wall of the shell, and the electric push rod, motor and metering pump are all electrically connected to the controller.

[0012] A coating method for a nano silver slurry coating device comprises the following steps: S1, loading the nano silver slurry into the storage tank of the feeding mechanism; S2. Place the substrate on the conveyor belt, start the conveying mechanism, and limit the conveyed substrate through the limiting mechanism so that the substrate is at the center of the conveyor belt; S3, start the feeding mechanism 7, accurately control the delivery amount of the nano silver slurry through the metering pump, and deliver the nano silver slurry to the coating nozzle; S4. When the metering pump is running, the collection shell of the collection mechanism opens automatically; S5, coating the transported substrate with nano silver slurry using a coating nozzle; S6. After coating is completed, the collecting mechanism controls the collecting shell to automatically reset, so that the residual slurry dripping from the coating nozzle drips into the collecting shell.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention provides a collection mechanism. The collection shell automatically opens during coating without affecting the coating work, and automatically resets after coating is completed. It can effectively collect the residual slurry dripping from the coating nozzle, avoid slurry waste and workbench pollution, and reduce production costs and cleaning costs.

[0014] 2. The present invention sets a limiting mechanism to limit the substrate during transportation, ensuring that the substrate is always located at the center of the conveyor belt, effectively avoiding the substrate from shifting during transportation, thereby significantly improving the coating accuracy of the nanosilver paste and ensuring product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the overall structure of a nano silver slurry coating device and coating method proposed in the present invention; Figure 2 This is a schematic diagram of the shell structure of a nano silver slurry coating device and coating method proposed in the present invention; Figure 3 This is a schematic diagram of the collection shell structure of a nano-silver slurry coating device and coating method proposed in the present invention; Figure 4 A schematic diagram of the slot structure of a nano silver slurry coating device and coating method proposed in the present invention; Figure 5 A cross-sectional view of a connecting plate of a nano-silver paste coating device and coating method proposed by the present invention; In the figure: 1. frame; 2. conveying mechanism; 3. shell; 31. support plate; 4. coating nozzle; 5. limiting mechanism; 6. collecting mechanism; 7. feeding mechanism; 51. electric push rod; 52. L-shaped follower plate; 53. limiting wheel; 54. guide rod; 61. fixing plate; 62. rotating shaft; 63. connecting plate; 64. collecting shell; 65. driven gear; 66. motor; 67. driving gear; 71. storage tank; 72. metering pump; 8. slot; 81. sleeve; 82. wedge block; 83. return spring; 84. U-shaped pull rod; 641. plug block; 642. slot; 9. controller. DETAILED DESCRIPTION

[0016] In order to make the technical means, creative features, and purpose effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0017] In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," "the other end," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0018] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "connected," etc., should be understood in a broad sense. For example, "connected" may refer to a fixed connection, a detachable connection, or an integral connection; it may refer to a mechanical connection or an electrical connection; it may refer to a direct connection or an indirect connection through an intermediate medium; it may refer to internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0019] See also Figure 1-5 The present invention provides a nano silver slurry coating device, comprising: Rack 1; The conveying mechanism 2 is arranged on the frame 1 and is used to convey the substrate; The housing 3 is fixedly mounted on the upper side wall of the frame 1, and a support plate 31 is fixedly connected between the inner walls of both sides of the housing 3; The coating nozzle 4 is installed at the center of the lower side wall of the support plate 31; The limiting mechanism 5 is provided on the frame 1 and is used to limit the position of the substrate during transportation; The collecting mechanism 6 is provided on the support plate 31 and is used to automatically collect the residual slurry dripping from the coating nozzle 4 after coating is completed; The feeding mechanism 7 is arranged on the top of the shell 3 and is used to transport slurry to the coating nozzle 4.

[0020] By setting the above structure, precise coating of the substrate is achieved and waste of nano silver paste can be avoided.

[0021] It should be noted that the conveying mechanism 2 uses a conveyor belt to convey the substrate. The conveying mechanism 2 is a mature existing technology, and its specific structure and principle are not described in detail herein.

[0022] Among them, the limiting mechanism 5 includes two electric push rods 51, which are respectively fixed on the outer walls of both sides of the frame 1. The telescopic ends of the electric push rods 51 pass through the side walls of the frame 1 and are fixedly connected to an L-shaped follower plate 52. A number of limiting wheels 53 are rotatably provided on the upper inner wall of the L-shaped follower plate 52. A guide rod 54 is fixed on the outer wall of one side of the L-shaped follower plate 52 close to the electric push rod 51 and on both sides of the electric push rod 51. The other end of the guide rod 54 slides through the side wall of the frame 1 and extends to its outside.

[0023] By setting up the above structure, the substrate can be limited during the transportation process to ensure that the substrate is always located at the center of the conveyor belt, effectively avoiding the substrate from shifting during the transportation process, thereby significantly improving the coating accuracy of the nanosilver paste and ensuring product quality.

[0024] Among them, the collecting mechanism 6 includes two fixed plates 61, which are symmetrically arranged on the lower side wall of the support plate 31. A rotating shaft 62 is rotatably provided between the two fixed plates 61. A connecting plate 63 is fixedly sleeved on the rotating shaft 62, and a collecting shell 64 is installed on the connecting plate 63. A driven gear 65 is fixedly sleeved on one end of the rotating shaft 62. A motor 66 is installed on one side wall of one of the fixed plates 61. The output shaft of the motor 66 passes through the fixed plate 61 and is fixedly connected to a driving gear 67 that meshes with the driven gear 65.

[0025] Through the arrangement of the above structure, the collecting shell 64 automatically opens during coating without affecting the coating work, and automatically resets after coating is completed, which can effectively collect the residual slurry dripping from the coating nozzle 4, avoid slurry waste and workbench pollution, and reduce production costs and cleaning costs.

[0026] Among them, the feeding mechanism 7 includes a storage tank 71 and a metering pump 72 fixedly arranged on the upper outer wall of the shell 3. The storage tank 71 and the input end of the metering pump 72 are connected through a material delivery pipe, and the output end of the metering pump 72 is connected to the coating nozzle 4 through a material delivery pipe.

[0027] By setting the above structure, the nanosilver slurry can be delivered to the coating nozzle 4, and the metering pump 72 can accurately control the delivery amount of the slurry, thereby controlling the coating amount, avoiding circuit short circuit caused by excessive slurry or circuit breakage caused by insufficient slurry.

[0028] Among them, a slot 8 is opened on one side wall of the connecting plate 63, and two symmetrically distributed sleeves 81 are fixedly connected to the top wall of the connecting plate 63. A wedge block 82 is slidably provided in the sleeve 81, and the lower end of the wedge block 82 extends into the slot 8. A return spring 83 is provided between the upper side wall of the wedge block 82 and the sleeve 81, and a U-shaped pull rod 84 is fixed between the upper side walls of the two wedge blocks 82.

[0029] Through the arrangement of the above structure, the collection shell 64 can be conveniently disassembled and assembled.

[0030] An insert block 641 adapted to the slot 8 is fixedly connected to the outer wall of the collecting shell 64 close to the connecting plate 63 , and two slots 642 adapted to the wedge block 82 are provided on the upper side wall of the insert block 641 .

[0031] Among them, a controller 9 is provided on the outer wall of one side of the shell 3, and the electric push rod 51, motor 66 and metering pump 72 are all electrically connected to the controller 9. The controller 9 can control the electric push rod 51, motor 66 and metering pump 72. When the position of the L-shaped follower plate 52 needs to be adjusted, the electric push rod 51 can be controlled by the controller 9. When the metering pump 72 is running, that is, when coating, the controller 9 will control the motor 66 to rotate so that the collection shell 64 opens. When the metering pump 72 is closed, that is, when the coating is completed, the controller 9 controls the motor 66 to reverse so that the collection shell 64 is reset.

[0032] It should be noted that the above-mentioned controller 9 adopts an STM32 single-chip microcomputer. The input and output pins of the single-chip microcomputer are connected to the electric push rod 51, the motor 66 and the metering pump 72 according to the above description, and this can be achieved by programming the single-chip microcomputer. The circuits and programs used are commonly used technologies in the field of single-chip microcomputers. Those skilled in the art can easily derive the specific circuit based on the above-mentioned control relationship description. Therefore, this article will no longer describe the specific circuit in detail.

[0033] A coating method for a nano silver slurry coating device comprises the following steps: S1, loading the nano silver slurry into the storage tank 71 of the feeding mechanism 7; S2, placing the substrate on the conveyor belt, and starting the conveying mechanism 2, limiting the conveyed substrate by the limiting mechanism 5, so that the substrate is at the center of the conveyor belt; S3, start the feeding mechanism 7, accurately control the delivery amount of the nano silver slurry through the metering pump 72, and deliver the nano silver slurry to the coating nozzle 4; S4, when the metering pump 72 is running, the collecting shell 64 of the collecting mechanism 6 automatically opens; S5, the coating nozzle 4 coats the transported substrate with nano silver slurry; S6 , after coating is completed, the collecting mechanism 6 controls the collecting shell 64 to automatically reset, so that the residual slurry dripping from the coating nozzle 4 drips into the collecting shell 64 .

[0034] When the present invention is in use, the substrate is placed on the conveyor belt of the conveying mechanism 2, and the two electric push rods 51 are controlled to operate by the controller 9. The telescopic ends of the two electric push rods 51 are extended synchronously, and the L-shaped follower plate 52 is pushed close to the substrate under the guidance of the guide rod 54. In the process of approaching, the limiting wheel 53 will fit the side of the substrate, fit the side of the substrate from both sides, and can correct the substrate to avoid tilting. After fitting, the electric push rod 51 is closed, and the metering pump 72 is started by the controller 9. When the metering pump 72 is started, the controller 9 automatically controls the motor 66 to start, and the output shaft of the motor 66 drives the driving gear 67 to rotate, so that the driven gear 65 engaged with it drives the rotating shaft 62 to rotate, and the rotation of the rotating shaft 62 can drive the connecting plate 63 to rotate, so that the collecting shell 64 rotates with the rotating shaft 62 as the axis, and a certain tilt occurs to avoid the coating area of ​​the coating nozzle 4. The metering pump 72 extracts the slurry in the storage tank 71 and transports it to the coating nozzle 4, and the coating nozzle 4 performs coating on the substrate passing through. After coating, the metering pump 72 is turned off by the controller 9, and then the controller 9 automatically controls the motor 66 to reverse. After transmission, the collecting shell 64 is reset to timely receive the residual slurry dripping from the coating nozzle 4. When the slurry in the collecting shell 64 needs to be dumped, the U-shaped pull rod 84 is pulled, and the U-shaped pull rod 84 drives the two wedge blocks 82 to move up at the same time, so that the wedge blocks 82 are disengaged from the slots 642 on the insert blocks 641, and then the collecting shell 64 can be removed to pour out the collected slurry. When installing the collection shell 64, insert the insert block 641 into the slot 8. The insert block 641 will squeeze the inclined surface of the wedge block 82 in the slot 8. The wedge block 82 will move upward due to the squeezing and retract into the sleeve 81, and compress the return spring 83 to make space for the insert block 641 to enter. When the insert block 641 is fully inserted into the slot 8, the wedge block 82 loses its squeezing and is inserted into the card slot 642 under the push of the return spring 83. The insert block 641 is fixed in the slot 8, and the installation of the collection shell 64 is completed.

[0035] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A nano silver slurry coating device, characterized in that, include: Rack (1); A conveying mechanism (2), the conveying mechanism (2) being arranged on the frame (1), and the conveying mechanism (2) being used to convey the substrate; A shell (3), the shell (3) being fixedly arranged on the upper side wall of the frame (1), and a support plate (31) being fixedly connected between the inner walls on both sides of the shell (3); a coating nozzle (4), the coating nozzle (4) being mounted at the center of the lower side wall of the support plate (31); A limiting mechanism (5), the limiting mechanism (5) is arranged on the frame (1), and the limiting mechanism (5) is used to limit the substrate during the conveying process; A collecting mechanism (6), the collecting mechanism (6) being arranged on the support plate (31), and the collecting mechanism (6) being used to automatically collect residual slurry dripping from the coating nozzle (4) after coating is completed; A feeding mechanism (7) is provided on the top of the shell (3), and the feeding mechanism (7) is used to deliver slurry to the coating nozzle (4).

2. The nano silver slurry coating device according to claim 1, characterized in that: The limiting mechanism (5) comprises two electric push rods (51), the two electric push rods (51) are respectively fixedly arranged on the outer walls of both sides of the frame (1), the telescopic ends of the electric push rods (51) pass through the side walls of the frame (1) and are fixedly connected to an L-shaped follower plate (52), a plurality of limiting wheels (53) are rotatably provided on the upper inner wall of the L-shaped follower plate (52), and a guide rod (54) is fixedly provided on the outer wall of one side of the L-shaped follower plate (52) close to the electric push rod (51) and on both sides of the electric push rod (51), and the other end of the guide rod (54) slides through the side wall of the frame (1) and extends to the outside thereof.

3. The nano silver slurry coating device according to claim 2, characterized in that: The collecting mechanism (6) comprises two fixed plates (61), the two fixed plates (61) being symmetrically arranged on the lower side wall of the support plate (31), a rotating shaft (62) being rotatably provided between the two fixed plates (61), a connecting plate (63) being fixedly sleeved on the rotating shaft (62), a collecting shell (64) being mounted on the connecting plate (63), one end of the rotating shaft (62) being fixedly sleeved with a driven gear (65), a motor (66) being mounted on one side wall of one of the fixed plates (61), an output shaft of the motor (66) passing through the fixed plate (61) and being fixedly connected to a driving gear (67) meshing with the driven gear (65).

4. The nano silver slurry coating device according to claim 3, characterized in that: The feeding mechanism (7) comprises a storage tank (71) and a metering pump (72) fixedly arranged on the upper outer wall of the shell (3); the storage tank (71) and the input end of the metering pump (72) are connected via a material delivery pipeline, and the output end of the metering pump (72) is connected to the coating nozzle (4) via a material delivery pipeline.

5. The nano silver slurry coating device according to claim 3, characterized in that: A slot (8) is provided on one side wall of the connecting plate (63), and two symmetrically distributed housings (81) are fixedly connected to the top wall of the connecting plate (63). A wedge block (82) is slidably provided in the housing (81), and the lower end of the wedge block (82) extends into the slot (8). A return spring (83) is provided between the upper side wall of the wedge block (82) and the housing (81), and a U-shaped pull rod (84) is fixed between the upper side walls of the two wedge blocks (82).

6. The nano silver slurry coating device according to claim 5, characterized in that: An insert block (641) adapted to the slot (8) is fixedly connected to an outer wall of one side of the collection shell (64) close to the connecting plate (63), and two slots (642) adapted to the wedge block (82) are provided on the upper side wall of the insert block (641).

7. The nano silver slurry coating device according to claim 4, characterized in that: A controller (9) is provided on one side outer wall of the housing (3), and the electric push rod (51), the motor (66) and the metering pump (72) are all electrically connected to the controller (9).

8. A coating method based on the nano silver slurry coating equipment according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1, loading the nanosilver slurry into the storage tank (71) of the feeding mechanism (7); S2, placing the substrate on the conveyor belt, and starting the conveying mechanism (2), limiting the conveyed substrate by the limiting mechanism (5), so that the substrate is located at the center of the conveyor belt; S3, starting the feeding mechanism 7, accurately controlling the delivery amount of the nanosilver slurry through the metering pump (72), and delivering the nanosilver slurry to the coating nozzle (4); S4, when the metering pump (72) is running, the collecting shell (64) of the collecting mechanism (6) automatically opens; S5, the coating nozzle (4) coats the transported substrate with nano silver slurry; S6. After the coating is completed, the collecting mechanism (6) controls the collecting shell (64) to automatically reset, so that the residual slurry dripping from the coating nozzle (4) drips into the collecting shell (64).

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