A multi-spray gun switchable PCB board light-curing adhesive coating device

Abstract

The present invention relates to the field of photocuring adhesive coating devices, and specifically to a multi-spray gun switchable PCB board photocuring adhesive coating device, comprising a multi-axis robot, a plurality of nozzles, a turntable, a motor, a linear drive and a glue injection pump; the motor is mounted on the actuator of the multi-axis robot, the turntable is coaxially connected to the output shaft of the motor, the glue injection tube is connected to the multi-axis robot through the linear drive and can move along the axis direction of the turntable to connect to the input end of a nozzle, a plurality of nozzles are connected to the turntable and the input end can move to the front of the movement direction of the glue injection tube with the rotation of the turntable; the glue injection pump delivers glue to the working nozzle through the glue injection tube. The embodiment of the present invention drives a plurality of nozzles of different specifications to move by a motor, so that the glue injection tube can be selectively connected to a nozzle, so that the glue injection system can use different spraying means to spray photocuring adhesive on different parts of the PCB board, and the coating efficiency is improved without increasing the glue injection pump.

Description

Technical Field

[0001] The invention relates to the field of photocuring adhesive coating devices, and in particular to a multi-spray gun switchable PCB board photocuring adhesive coating device. Background Art

[0002] A conventional photocuring adhesive coating machine includes a multi-axis robot and at least one spray gun, each spray gun corresponds to an independent glue injection pump, and the glue injection pump draws the photocuring adhesive from a storage container of the photocuring adhesive and then sprays it out through the spray gun.

[0003] Since the sprayable area and sprayable width of different parts of the PCB are different, the caliber and shape of the optimal spray gun are also different. However, most existing spraying methods use the same spray gun to complete the coating work of the same PCB board, and ignore the coating requirements of different parts on the same PCB board by default. It is only applicable to PCB circuit boards with ordinary requirements. For precision PCB circuit boards, the coating requirements are higher.

[0004] Similarly, the same photocuring adhesive coating machine has poor adaptability to PCB circuit boards of different specifications due to a single spray gun, and most of the time the spray gun needs to be replaced.

[0005] In summary, a coating machine with a single spray gun is difficult to match the coating requirements of different PCB boards and different parts of the same PCB board, which can easily cause spray overflow and incomplete spraying and the need for re-coating, thereby increasing the cost of secondary processing and reducing processing efficiency. Summary of the invention

[0006] The purpose of the present invention is to provide a multi-spray gun switchable PCB board photocuring adhesive coating device to solve the problem that the traditional coating device has a single spraying width, cannot flexibly spray different parts of the precision PCB circuit board, and is prone to missing or over-spraying.

[0007] In order to solve the above technical problems, the present invention specifically provides the following technical solutions:

[0008] A multi-spray gun switchable PCB light-curing adhesive coating device,

[0009] It includes a multi-axis robot and a multi-nozzle spray gun, wherein the multi-nozzle spray gun is installed on the execution part of the multi-axis robot, and the multi-axis robot moves according to a preset path and speed, so that the multi-nozzle spray gun performs a spraying operation at a target position of the PCB board;

[0010] The multi-nozzle spray gun comprises: a plurality of nozzles, a rotating disk, a motor, a linear drive, a glue injection tube and a glue injection pump;

[0011] The motor is mounted on the actuator of the multi-axis robot, the turntable is rotatably connected to the actuator of the multi-axis robot through a bearing, and is coaxially connected to the output shaft of the motor, the glue injection tube is movably connected to the actuator of the multi-axis robot, the linear drive is fixedly connected to the actuator of the multi-axis robot, and the linear drive is drivingly connected to the glue injection tube to drive the glue injection tube to move along the axis direction of the turntable;

[0012] The glue injection tube can connect or separate one end of itself with the input end of one of the nozzles through its own movement, and a plurality of nozzles are evenly connected to the periphery of the turntable around the axis of the turntable, and the input end of each nozzle can move to the front of the movement direction of the glue injection tube along with the rotation of the turntable;

[0013] The glue injection pump is connected to one end of the glue injection tube away from the nozzle, and is used for extracting light-curing glue from a storage container and conveying the glue to the working nozzle through the glue injection tube.

[0014] Furthermore, the turntable is provided with inwardly recessed slots around its periphery, and a block is provided at one end of the nozzle connected to the turntable, and the block is connected to the slot on one side facing the turntable.

[0015] Furthermore, the outer circumferential surface of the turntable is provided with threads, and a threaded sleeve is sleeved on the outer side of the turntable, and the side of the clamping block away from the turntable abuts against the inner wall of the threaded sleeve.

[0016] Furthermore, the output shaft of the motor is coaxially connected to a prismatic shaft and a threaded shaft in sequence, the prismatic shaft is inserted into the turntable, and the prismatic shaft abuts against one end of the turntable, and a nut is connected to the threaded shaft, and the nut abuts against the other end of the turntable.

[0017] Furthermore, the output shaft of the motor forms an angle of 45 degrees with the horizontal plane, and the middle part of each nozzle is a 45-degree curved pipe, so that when the turntable rotates, the end of the nozzle can transition from a horizontal position to a vertical downward position.

[0018] Furthermore, the multi-nozzle spray gun also includes: a fixed disk, fixedly connected to the actuator of the multi-axis robot, with a circular vacuum flow channel formed inside, and coaxially arranged with the turntable; a reflux hole, penetrating the fixed disk and connected to the vacuum flow channel, used to connect the input end of each nozzle when the turntable stops rotating; a reflux pump, the input end of which penetrates the fixed disk and is connected to the vacuum flow channel, used to form a negative pressure inside the nozzle through the vacuum flow channel to cause the photocuring glue to reflux; a glue injection sleeve, penetrating the fixed disk and connected to the vacuum flow channel, and coaxially sealed and connected to the glue injection tube, used to guide the glue injection tube to pass through the vacuum flow channel, connect the corresponding nozzle and disconnect the nozzle from the vacuum flow channel.

[0019] Furthermore, a ring-shaped wear-resistant sheet is embedded in one end of the nozzle facing the fixed disk, and the wear-resistant sheet abuts against the bottom wall of the fixed disk. As the turntable rotates, the wear-resistant sheet slides on the bottom wall of the fixed disk.

[0020] Furthermore, the fixed plate includes an upper plate and a lower plate which are symmetrical in vertical direction, and an annular groove is provided on one end surface of the upper plate and the lower plate, and the two annular grooves are butted together to form the vacuum flow channel.

[0021] Furthermore, the fixing plate is provided with a stepped hole embedded in the bottom end of the bearing, and the output shaft of the motor is formed with an annular flange, and the annular flange abuts against the top end of the bearing.

[0022] Furthermore, a sealing ring is connected to the bottom wall of the glue injection tube, and the diameter of the sealing ring is larger than the diameter of the reflux hole. When the glue injection tube passes through the vacuum flow channel to connect to the nozzle, the end face of the glue injection tube is sleeved on the outside of a reflux hole and fits against the inner wall of the vacuum flow channel, thereby disconnecting the nozzle from the vacuum flow channel.

[0023] Compared with the prior art, this application has the following beneficial effects:

[0024] A multi-spray gun switchable PCB light-curing adhesive coating device is provided. In an embodiment of the present invention, a plurality of nozzles are arranged and a motor-driven turntable is used to move the positions of the nozzles, so that a glue injection system can selectively connect one of the plurality of nozzles of different specifications, thereby enabling the glue injection system to spray light-curing adhesive on different parts of the PCB board by using different spraying methods, thereby improving the coating efficiency without increasing the number of glue injection pumps.

[0025] Furthermore, the embodiment of the present invention also connects the reflux pump and the nozzle not connected to the glue injection system through a vacuum flow channel, so that the photocuring glue remaining in the nozzle during standby and after use can be immediately pumped away by the reflux pump, thereby reducing the dripping and solidification of the photocuring glue. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0027] Figure 1 A side view of an embodiment of the present invention;

[0028] Figure 2 for Figure 1 A local enlarged view of point A;

[0029] Figure 3 It is a front view of the motor, turntable, nozzle, glue injection system and reflux system of an embodiment of the present invention;

[0030] Figure 4 for Figure 3 Cross-sectional view in the BB direction;

[0031] Figure 5 for Figure 4 Another working condition of Figure 4 It is the glue injection working condition. Figure 5 It is a reflux condition;

[0032] Figure 6 A three-dimensional diagram of a motor, a rotating disk, a nozzle, a glue injection system and a reflux system according to an embodiment of the present invention;

[0033] Figure 7 It is an assembly diagram of a fixed disk and a rotating disk according to an embodiment of the present invention;

[0034] Figure 8 is an assembly diagram of a turntable according to an embodiment of the present invention;

[0035] The numbers in the figure represent the following:

[0036] 1-PCB board; 2-multi-axis robot; 21-cylinder; 3-nozzle; 31-bend pipe; 32-wear-resistant sheet; 33-block; 4-turntable; 41-slot; 42-threaded sleeve; 5-fixed plate; 51-bearing; 52-glue injection sleeve; 53-upper plate; 54-lower plate; 55-circular groove; 6-motor; 61-prismatic shaft; 62-threaded shaft; 63-annular flange; 64-nut; 7-glue injection system; 71-glue injection pump; 72-glue injection tube; 73-sealing ring; 8-reflux system; 81-reflux pump; 82-vacuum flow channel. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] A conventional photocuring adhesive coating machine includes a multi-axis robot 2 and at least one spray gun, each spray gun corresponds to an independent glue injection pump 71, and the glue injection pump 71 draws the photocuring adhesive from the storage container of the photocuring adhesive and then sprays it out through the spray gun. Different spray guns have nozzles of different calibers and shapes.

[0039] Since the sprayable area and sprayable width of different parts on the PCB board 1 are different, the caliber and shape of the optimal spray gun are also different. 1~2 spray guns are not enough to adapt to all specifications of PCB boards 1. The edges of the spraying parts of the spray guns are always prone to parts that need to be re-coated, which significantly reduces the spraying efficiency. However, 3 or even more spray guns will significantly increase the cost and complexity of the equipment.

[0040] In order to solve this problem, this embodiment provides a PCB board light-curing adhesive coating device with multiple switchable spray guns.

[0041] Figure 1 A side view of the PCB coating device is shown. Figure 2 Shown Figure 1 The local enlarged view of A, combined with Figure 1 , Figure 2 The PCB board coating device includes: a multi-axis robot 2 and a multi-nozzle spray gun, the multi-nozzle spray gun is installed on the execution part of the multi-axis robot 2, the multi-axis robot 2 moves according to a preset path and speed, so that the multi-nozzle spray gun performs a spraying operation at a target position of the PCB board 1.

[0042] The multi-nozzle spray gun includes: multiple nozzles 3, a turntable 4, a motor 6, a linear drive, a glue injection pump 71 and a cylinder 21; the motor 6 is installed on the actuator of the multi-axis robot 2, the turntable 4 is rotatably connected to the actuator of the multi-axis robot 2 through a bearing 51, and is coaxially connected to the output shaft of the motor 6, the glue injection tube 72 is movably connected to the actuator of the multi-axis robot 2, the linear drive is fixedly connected to the actuator of the multi-axis robot 2, and the linear drive is transmission-connected to the glue injection tube 72 to drive the glue injection tube 72 to move along the axial direction of the turntable 4.

[0043] The cylinder 21 is fixedly connected to the actuator of the multi-axis robot 2, and the cylinder 21 is transmission-connected to the glue injection tube 72 to drive the glue injection tube 72 to move axially. The glue injection tube 72 can connect or separate one end of itself with the input end of a nozzle 3 through its own movement. Multiple nozzles 3 are evenly connected around the axis of the turntable 4, and the input end of each nozzle 3 can move to the front of the movement direction of the glue injection tube 72 along with the rotation of the turntable 4.

[0044] The glue injection pump 71 is connected to one end of the glue injection tube 72 away from the nozzle 3 , and is used for extracting light-curing glue from the storage container and transporting the glue to the working nozzle 3 through the glue injection tube 72 .

[0045] The output shaft of the motor 6 forms an angle of 45 degrees with the horizontal plane. The turntable 4 is rotatably connected to the actuator of the multi-axis robot 2 through the bearing 51 and is coaxially connected to the output shaft of the motor 6. The middle part of each nozzle 3 is a curved pipe 31 bent at 45 degrees, so that when the turntable 4 rotates, the end of the nozzle 3 can transition from a horizontal position to a vertical downward position;

[0046] The working steps of a multi-nozzle spray gun include:

[0047] In the initial state, the multi-axis robot 2 carries a turntable 4 equipped with multiple nozzles 3, the axis of the turntable 4 forms an angle of 45 degrees with the horizontal plane, and the motor 6 drives the turntable 4 to rotate, so that only one end of the nozzle 3 is vertically downward toward the PCB board 1 at the same time, and the ends of the remaining nozzles 3 are horizontal or upward to avoid collision with components on the PCB board 1.

[0048] In the spraying operation, the nozzle 3 located at the working position is connected to the glue injection system 7. The glue injection pump 71 extracts the light-curing glue from the storage container and transports it to the nozzle 3 through the glue injection tube 72 to realize the spraying operation. The multi-axis robot 2 moves according to the preset path and speed to ensure that the light-curing glue evenly covers the required area of ​​the PCB board 1.

[0049] Nozzle switching, when it is necessary to change the spraying area and width, stop the spraying operation, the cylinder 21 drives the glue injection tube 72 to move up, disconnects the glue injection tube 72 from the current nozzle 3, and the motor 6 drives the turntable 4 to rotate, positioning another required nozzle 3 to the working position, and the cylinder 21 drives the glue injection tube 72 to move down, and the glue injection tube 72 is connected to the new nozzle 3 to start a new spraying operation.

[0050] In the embodiment of the present invention, a plurality of nozzles 3 are provided, and a turntable 4 driven by a motor 6 is used to move the position of the nozzle 3, so that the glue injection system can selectively connect one of the plurality of nozzles 3 of different specifications, thereby enabling the glue injection system to use different spraying methods to spray light-curing glue on different parts of the PCB board 1, thereby improving the coating efficiency without increasing the glue injection pump 71.

[0051] The turntable 4 is equivalent to a storage library attached to the multi-axis robot 2, which is used to receive, store, select and push out the nozzles 3 required for production.

[0052] Typically, the storage depot includes conical type, disc type and chain type. If the specifications and quantity of the nozzles 3 are large, a chain mechanism can be used instead of the turntable 4 to attach the nozzles 3 to the chain to expand the storage quantity of the nozzles 3. However, the conical mechanism and the chain mechanism are not suitable for synchronous movement with the actuator of the multi-axis robot 2. Therefore, the use of the turntable 4 is the preferred technical means.

[0053] Figure 3 The front view of the motor 6, the turntable 4, the nozzle 3, the injection system 7 and the reflux system 8 is shown. Figure 4 yes Figure 3 The cross-sectional view in the BB direction, Figure 4 The internal structure of the injection system 7 and the reflux system 8 is shown in FIG. Figure 5 yes Figure 4 Another working condition of Figure 4 It is the glue injection working condition. Figure 5 It is a reflow condition. Figure 6 A stereoscopic diagram of the motor 6, the turntable 4, the nozzle 3, the glue injection system 7 and the reflux system 8 is shown.

[0054] Furthermore, in actual applications, there may be residual photocuring glue inside the unused nozzle 3. Since the photocuring glue is easy to solidify, the residual glue may solidify inside the nozzle 3, causing the nozzle to be blocked and affecting subsequent use. In addition, after the nozzle 3 performing the spraying operation is separated from the glue injection system 7, as the turntable 4 rotates to connect to the return system 8, the residual photocuring glue inside the nozzle 3 is prone to dripping under the action of gravity and inertia. Therefore, it is necessary to clean the photocuring glue inside the nozzle 3 in real time to prevent solidification and dripping. In order to achieve this purpose, combined with Figure 3 , Figure 4 , Figure 5 , Figure 6 .

[0055] The multi-nozzle spray gun also includes:

[0056] The fixed plate 5 is fixedly connected to the actuator of the multi-axis robot 2, has a circular vacuum channel 82 formed inside, and is coaxially arranged with the rotating plate 4;

[0057] A reflux hole, which passes through the fixed disk 5 and is connected to the vacuum flow channel 82, and is used to connect the input end of each nozzle 3 when the rotating disk 4 stops rotating;

[0058] A reflux pump 81, the input end of which passes through the fixed plate 5 and is connected to the vacuum channel 82, and is used to form a negative pressure inside the nozzle 3 through the vacuum channel 82 to make the light-curing adhesive reflux;

[0059] The glue injection sleeve 52 passes through the fixed plate 5 and is connected to the vacuum flow channel 82 , and is coaxially sealed with the glue injection tube 72 , for guiding the glue injection tube 72 through the vacuum flow channel 82 , connecting the corresponding nozzle 3 while disconnecting the nozzle 3 from the vacuum flow channel 82 .

[0060] Among them, the bottom wall and the outer wall of the glue injection tube 72 are connected with a sealing ring 73, the diameter of the sealing ring 73 is larger than the diameter of the reflux hole, and when the glue injection tube 72 passes through the vacuum channel 82 to connect the nozzle 3, the end face of the glue injection tube 72 fits with the inner wall of the vacuum channel 82. At this time, the sealing ring 73 is located between the end face of the glue injection tube 72 and the reflux hole, thereby disconnecting the nozzle 3 from the vacuum channel 82.

[0061] Working principle of the reflux system in various working conditions:

[0062] In the initial state, the working nozzle 3 is connected to the glue injection system 7 to perform spraying operation, and the unused nozzle 3 is connected to the vacuum flow channel 82 through the through hole of the fixed plate 5, and the reflux pump 81 evacuates the interior thereof.

[0063] During the spraying operation, while the working nozzle 3 is spraying, the reflux pump 81 is continuously running to extract the residual light-curing adhesive in the unused nozzle 3 to prevent solidification.

[0064] The nozzle is switched, the current nozzle 3 is disconnected from the glue injection tube 72 and connected to the vacuum flow channel 82 at the same time, the reflux system 8 extracts the residual light-curing glue inside it, and then the motor 6 drives the turntable 4 to rotate to position the new nozzle 3 to the working position.

[0065] In the above production process, each nozzle 3 is either connected to the glue injection pump 71 through the glue injection tube 72 to perform the operation of applying the photocuring glue, or connected to the reflux pump 81 through the vacuum flow channel 82 to perform the operation of emptying the photocuring glue, so that there is no residual photocuring glue in the nozzle 3 during standby and after use, so that the photocuring glue is less exposed to air and light, reducing the dripping and solidification of the photocuring glue.

[0066] Figure 7 The assembly diagram of the fixed disk 5 and the rotating disk 4 is shown. Figure 4 , Figure 5 and Figure 7 .

[0067] A ring-shaped wear-resistant sheet 32 ​​is embedded in one end of the nozzle 3 facing the fixed disk 5. The wear-resistant sheet 32 ​​abuts against the bottom wall of the fixed disk 5. As the turntable 4 rotates, the wear-resistant sheet 32 ​​slides on the bottom wall of the fixed disk 5. The wear-resistant sheet 32 ​​is not only used to extend the service life of the nozzle 3, but also serves to seal the assembly gap between the nozzle 3 and the reflux hole at the bottom of the fixed disk 5.

[0068] Figure 8 The assembly diagram of the turntable 4 is presented, combined with Figure 8 The turntable 4 is provided with inwardly recessed grooves 41 around it, and the outer peripheral surface is provided with threads. A threaded sleeve 42 is sleeved on the outer side of the turntable 4. A block 33 is provided at one end of the nozzle 3 connected to the turntable 4. After the block 33 is connected to the groove 41, the axial movement and rotation of the nozzle 3 are restricted.

[0069] The fixed plate 5 includes an upper plate 53 and a lower plate 54 which are symmetrical in vertical direction. An annular groove 55 is formed on one end surface of the upper plate 53 and the lower plate 54 . The two annular grooves 55 are butted together to form a vacuum flow channel 82 .

[0070] The output shaft of the motor 6 is coaxially connected with a prismatic shaft 61 and a threaded shaft 62 in sequence, and an annular flange 63 is formed on the output shaft. The prismatic shaft 61 is inserted into the turntable 4, the threaded shaft 62 is connected with a nut 64, the bottom end of the bearing 51 abuts against the top of the fixed plate 5, and the top end of the bearing 51 abuts against the annular flange 63.

[0071] The output shaft of the motor 6 drives the turntable 4 to rotate through the prismatic shaft 61 , the threaded shaft 62 and the nut 64 fix the axial position of the turntable 4 , and the bearing 51 ensures the stability of the rotation of the turntable 4 .

[0072] The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present invention.

Claims

1. A multi-spray gun switchable PCB board light-curing adhesive coating device, characterized in that: It comprises a multi-axis robot (2) and a multi-nozzle spray gun, wherein the multi-nozzle spray gun is mounted on an execution part of the multi-axis robot (2), and the multi-axis robot (2) moves according to a preset path and speed, so that the multi-nozzle spray gun performs a spraying operation at a target position of the PCB board (1); The multi-nozzle spray gun comprises: a plurality of nozzles (3), a rotating disk (4), a fixed disk (5), a motor (6), a linear drive, a reflux pump (81), a glue injection pump (71), a glue injection tube (72) and a glue injection sleeve (52); the motor (6) is mounted on the actuator of the multi-axis robot (2); the rotating disk (4) is rotatably connected to the actuator of the multi-axis robot (2) via a bearing (51) and is coaxially connected to the output shaft of the motor (6); the glue injection tube (72) is movably connected to the actuator of the multi-axis robot (2); the linear drive is fixedly connected to the actuator of the multi-axis robot (2); and the linear drive is drivingly connected to the glue injection tube (72) to drive the glue injection tube (72) to move along the axis direction of the rotating disk (4); The glue injection tube (72) can connect or disconnect one end of itself with the input end of one of the nozzles (3) through its own movement, and a plurality of the nozzles (3) are evenly connected to the periphery of the turntable (4) around the axis of the turntable (4), and the input end of each of the nozzles (3) can move to the front of the movement direction of the glue injection tube (72) as the turntable (4) rotates; The glue injection pump (71) is connected to an end of the glue injection tube (72) away from the nozzle (3), and is used to extract light-curing glue from a storage container and transport the glue to the nozzle (3) through the glue injection tube (72); The fixed disk (5) is fixedly connected to the execution part of the multi-axis robot (2), has a circular vacuum flow channel (82) formed inside, and is coaxially arranged with the rotating disk (4); The reflux hole passes through the fixed disk (5) and is connected to the vacuum flow channel (82), and is used to connect to the input end of each nozzle (3) when the rotating disk (4) stops rotating; The input end of the reflux pump (81) passes through the fixed disk (5) and is connected to the vacuum flow channel (82), and is used to form a negative pressure inside the nozzle (3) through the vacuum flow channel (82) to cause the light-curing adhesive to reflux; The glue injection sleeve (52) passes through the fixed plate (5) and is connected to the vacuum flow channel (82), and is coaxially sealed with the glue injection tube (72). The glue injection sleeve (52) is used to guide the glue injection tube (72) through the vacuum flow channel (82), connect the corresponding nozzle (3) and disconnect the corresponding nozzle (3) from the vacuum flow channel (82).

2. The multi-spray gun switchable PCB light-curing adhesive coating device according to claim 1, characterized in that: The rotating disk (4) is provided with inwardly recessed slots (41) around its periphery, and a clamping block (33) is provided at one end of the nozzle (3) connected to the rotating disk (4), and the clamping block (33) is connected to the slot (41) on one side facing the rotating disk (4).

3. The multi-spray gun switchable PCB light-curing adhesive coating device according to claim 2, characterized in that: The outer circumferential surface of the rotating disk (4) is provided with threads, a threaded sleeve (42) is sleeved on the outer side of the rotating disk (4), and a side of the clamping block (33) away from the rotating disk (4) abuts against the inner wall of the threaded sleeve (42).

4. The multi-spray gun switchable PCB light-curing adhesive coating device according to claim 1, characterized in that: The output shaft of the motor (6) is coaxially connected in sequence to a prismatic shaft (61) and a threaded shaft (62); the prismatic shaft (61) is inserted into the turntable (4), and the prismatic shaft (61) abuts against one end of the turntable (4); a nut (64) is connected to the threaded shaft (62), and the nut (64) abuts against the other end of the turntable (4).

5. The multi-spray gun switchable PCB light-curing adhesive coating device according to claim 1, characterized in that: The output shaft of the motor (6) forms an angle of 45 degrees with the horizontal plane, and the middle portion of each nozzle (3) is a curved pipe (31) bent at 45 degrees, so that when the turntable (4) rotates, the end of the nozzle (3) can transition from a horizontal position to a vertical downward position.

6. The multi-spray gun switchable PCB light-curing adhesive coating device according to claim 1, characterized in that: A circular ring-shaped wear-resistant sheet (32) is embedded in one end of the nozzle (3) facing the fixed disk (5), and the wear-resistant sheet (32) abuts against the bottom wall of the fixed disk (5). As the rotating disk (4) rotates, the wear-resistant sheet (32) slides on the bottom wall of the fixed disk (5).

7. The multi-spray gun switchable PCB light-curing adhesive coating device according to claim 1, characterized in that: The fixed plate (5) comprises an upper plate (53) and a lower plate (54) which are symmetrical in upper and lower directions. An annular groove (55) is provided on one end surface of the upper plate (53) and the lower plate (54). The two annular grooves (55) are butted together to form the vacuum flow channel (82).

8. The multi-spray gun switchable PCB light-curing adhesive coating device according to claim 1, characterized in that: The fixed plate (5) is provided with a stepped hole embedded in the bottom end of the bearing (51), and the output shaft of the motor (6) is formed with an annular flange (63), and the annular flange (63) abuts against the top end of the bearing (51).

9. The multi-spray gun switchable PCB light-curing adhesive coating device according to claim 1, characterized in that: The bottom wall of the glue injection tube (72) is connected to a sealing ring (73), the diameter of the sealing ring (73) being greater than the diameter of the reflux hole; when the glue injection tube (72) passes through the vacuum flow channel (82) to connect to the nozzle (3), the end face of the glue injection tube (72) is sleeved on the outside of a reflux hole and fits against the inner wall of the vacuum flow channel (82), thereby disconnecting the nozzle (3) from the vacuum flow channel (82).

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