Light conversion granule material injection mechanism, coating method and system for preventing precipitation

Abstract

The present invention belongs to the technical field of LED component packaging, and particularly relates to an anti-sediment light conversion granule injection mechanism, a coating method and a system thereof. The injection mechanism includes a rotating motor, a transmission mechanism connected to the rotating motor, a self-rotating injection cylinder connected to the transmission mechanism, and a syringe head arranged at the lower part of the self-rotating injection cylinder. The rotating motor provides power and drives the self-rotating injection cylinder to rotate through the transmission mechanism. The method is to form a vortex of the slurry and discharge the slurry from the vortex hole to coat the target object. The system uses the anti-sediment light conversion granule injection mechanism to coat the light conversion granules on the target object. The technical solution provided by the present invention is to place the slurry in a self-rotating injection cylinder that can rotate, forming a vortex to ensure that the slurry is always uniform and free of sediment. Since the entire system is different from the transmission dispensing method, it needs to be sealed and the injection amount is controlled by air pressure, and each part is relatively independent. Therefore, installation, maintenance, etc. are all simpler and more convenient.

Description

Technical Field

[0001] The present invention belongs to the technical field of LED component packaging, and particularly relates to a light conversion granule injection mechanism, a coating method and a coating system for preventing precipitation. Background Art

[0002] Due to the advantages of high luminous efficiency, low power consumption, long service life and small component volume of light-emitting diodes (LEDs), they have been widely used in display or lighting products.

[0003] There are mainly two methods to achieve white light LEDs. One is to use a blue LED chip in combination with a light conversion granule to generate white light; the other method is to mix multiple monochromatic lights together to generate white light; each monochromatic light can be obtained by using a light conversion granule. LED light conversion granules generally include phosphors, KSF and quantum dots, all of which are micro-nano crystal particles.

[0004] In order to obtain an ideal light-emitting effect, it is necessary to ensure that the coating of the light conversion granules is uniform. The main obstacles to uniformity lie in the uniformity of the coating slurry and the uniformity of each part on the substrate.

[0005] Currently, in the LED packaging method, the coating or powder dotting method suspends the light conversion granules in a suitable liquid dispersion medium, and then coats them on the chip surface by spraying or dispensing. Due to the self-weight of the light conversion granules, they sink during the spraying or dispensing process, resulting in difficulty in achieving complete uniformity in the mixing uniformity of the mixed glue, which will inevitably cause deviation in the important index of the light color of the LED component, and the dispensing head is also very likely to be blocked by the precipitation of the light conversion granules, affecting normal production.

[0006] To solve the above problems, the glue solution mixed with the light conversion granules and the dispersion medium needs to be stirred efficiently and continuously. In the prior art, the stirring process mainly focuses on before entering the dispensing syringe. The glue solution in the glue bucket is mixed by magnetic stirring or mechanical stirring, and then the glue solution is quantitatively pressed into the syringe by air pressure, and then the glue solution in the syringe is extruded by air pressure. For example, the dispensing machines provided in Chinese patents CN105057166 and CN102873006 mainly solve the problem of the uniformity of the glue solution before entering the dispensing syringe, but there is still a precipitation problem when the glue solution enters the dispensing syringe.

[0007] Regarding the problem of uniformity of glue in the dispensing syringe, some researchers have also conducted relevant research. For example, CN201618671 discloses a dispensing machine syringe, which mixes the glue in the syringe by adding a stirring rod in the syringe, but the internal space of the syringe is very small, and the mixing effect of the stirring rod is not ideal. In addition, it is necessary to take into account the airtightness of the system, the stability of the air pressure injection and the driving mechanism of the stirring rod, which invisibly makes the structure of the syringe greatly complicated, and the actual operability is not ideal. In addition, CN201969992 provides an LED dispensing machine, which is provided by setting a magnetic plunger in the syringe. Before loading, the magnetic plunger is moved up and down in the magnetic field to move in the syringe to mix, but this method also occupies a large amount of the internal volume of the glue barrel, and requires an external magnetic field to intervene. The most important thing is that this method still has a static process before dispensing, and the setting of the magnetic plunger still hinders the outflow of the glue and many other problems.

[0008] As for the uniformity of the substrate surface distribution, compared with the traditional method of directly covering the slurry on the substrate through a dispensing machine, the water surface floating film coating method is more ideal, that is, the slurry is coated on the water surface, the slurry is evenly distributed by the diffusion of the water surface, and then the evenly distributed coating is transferred to the substrate surface. Chinese patent CN107876320 discloses this coating method and device, which is achieved through two tanks.

[0009] The uniformity of adhesive coating is a problem that must be solved when facing certain high-quality products or micro-sized products. The current methods for solving the above problems have low production efficiency and high costs in all aspects, which limits product upgrades and market promotion. Summary of the invention

[0010] The invention provides a precipitation-resistant light-conversion granular material injection mechanism and a coating method and system, which are used to solve the problem that the light-conversion granular material is easy to precipitate during injection.

[0011] In order to solve the above technical problems, the technical solution of the present invention is: the anti-precipitation photoconversion granular material injection mechanism includes a rotating motor and a transmission mechanism connected to the rotating motor, a self-rotating injection barrel connected to the transmission mechanism and a syringe head arranged at the lower part of the self-rotating injection barrel, the rotating motor provides power to drive the self-rotating injection barrel to rotate through the transmission mechanism.

[0012] Optionally, the self-rotating injection barrel includes a cylindrical body, a cylindrical accommodating cavity arranged in the body, and a connecting head arranged at the bottom of the body for mounting a syringe head, and the accommodating cavity is communicated with the connecting head.

[0013] Optionally, a pulsator is provided at the bottom of the accommodating chamber, and the pulsator can further enhance the stirring of the slurry.

[0014] Optionally, the transmission mechanism includes a driving gear disposed on the output shaft of the rotating motor and a driven gear disposed on the self-rotating material injection cylinder. Gear transmission can precisely control the rotation speed of the self-rotating material injection cylinder.

[0015] Optionally, the transmission mechanism further includes at least one transmission gear disposed between the driving gear and the driven gear. The transmission gear meshes with the driving gear, and the driven gear meshes with the transmission gear. The distance or transmission ratio between the driving gear and the driven gear can be controlled according to the situation through the transmission gear.

[0016] Optionally, the anti-settling light conversion particle material injection mechanism further includes a carrier platform for carrying the rotating motor, the transmission mechanism, and the self-rotating material injection cylinder. The self-rotating material injection cylinder is connected to the carrier platform through a bearing.

[0017] The present invention also provides a coating method, which forms a vortex of the slurry and discharges the slurry from the vortex hole.

[0018] A vortex is a spiral confluence formed by the mutual attraction and entanglement of two or more energies with differences in direction, flow rate, temperature, etc. when they come into contact with each other.

[0019] Optionally, the slurry forms a vortex through the self-rotation of the carrying device, and the rotation speed of the carrying device is controlled to discharge the slurry from the notch at the bottom of the vortex.

[0020] Optionally, the slurry is a mixture of light conversion particle materials and a dispersion medium.

[0021] Optionally, the light conversion particle material is a phosphor, KSF, or quantum dot.

[0022] Optionally, the coating method is used for preparing a light-emitting element by a water surface floating film coating method.

[0023] The present invention also provides a coating system, which coats the light conversion particle material on a target object by using the above anti-settling light conversion particle material injection mechanism.

[0024] Optionally, the coating system includes a workbench, a premixing tank disposed on the workbench, a transfer mechanism, the anti-settling light conversion particle material injection mechanism, and a workpiece tank located below the anti-settling light conversion particle material injection mechanism. The transfer mechanism extracts the slurry from the premixing tank and quantitatively introduces it into the self-rotating material injection cylinder, and then coats it on the target object in the workpiece tank.

[0025] Optionally, the transfer mechanism includes a material taking device, a support frame for fixing the material taking device, and a cylinder fixed on the support frame for driving the material taking device.

[0026] Optionally, the material taking device is a syringe, and the syringe is connected to the piston rod of the air cylinder. The syringe extracts the slurry from the premixing tank and then injects the slurry into the self-rotating injection cylinder.

[0027] Optionally, the transfer mechanism further includes a three-degree-of-freedom moving mechanism, and the support frame is connected to the three-degree-of-freedom moving mechanism to achieve linear motion in the X direction, Y direction, and Z direction.

[0028] The technical solution provided by the present invention is to place the slurry in a self-rotating injection cylinder to form a vortex to ensure that the slurry is always uniform and free of precipitation. Since the entire system is different from the traditional dispensing method, it needs to be sealed and the injection volume is controlled by air pressure. Each part is relatively independent, so installation, maintenance, and repair are all simpler and more convenient. Description of the Drawings

[0029] Figure 1 is a schematic structural diagram of a specific embodiment of the coating system of the present invention;

[0030] Figure 2 is a schematic structural diagram of a specific embodiment of the anti-precipitation light conversion granule injection mechanism of the present invention;

[0031] Figure 3 is a schematic structural diagram of a specific embodiment of the transmission mechanism of the present invention;

[0032] Figure 4 is a top view of a specific embodiment of the self-rotating injection cylinder of the present invention;

[0033] Figure 5 is Figure 4 the three-dimensional view after half-section of.

[0034] As shown in the figure:

[0035] 100 - workbench, 200 - premixing tank, 300 - transfer mechanism, 310 - syringe, 320 - support frame, 330 - air cylinder, 340 - Z-direction linear moving mechanism, 350 - X-direction linear moving mechanism, 360 - Y-direction linear moving mechanism, 400 - anti-precipitation light conversion granule injection mechanism, 410 - bearing platform, 420 - rotating motor, 430 - transmission mechanism, 431 - driving gear, 432 - transmission gear, 433 - driven gear, 440 - self-rotating injection cylinder, 441 - body, 442 - accommodating cavity, 443 - connecting head, 444 - impeller, 450 - syringe head, 461 - first bearing, 462 - second bearing, 470 - X-direction self-rotating injection cylinder moving mechanism, 500 - workpiece tank, 510 - carrier, 520 - first groove, 530 - second groove. Detailed Embodiment

[0036] For the sake of easy understanding, the anti-settling light conversion granule feeding mechanism and coating system will be described below in conjunction with embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention.

[0037] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation and positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0038] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] As Figure 1 shown, a coating system includes a workbench 100, a premixing tank 200 arranged on the workbench 100, a transfer mechanism 300 located above the premixing tank 200, an anti-settling light conversion granule feeding mechanism 400 located below the transfer mechanism 300, and a workpiece tank 500.

[0040] Continue to refer to Figure 1 , the premixing tank 200 is a bucket with an automatically controlled cover, in which the light conversion granules and the dispersion medium are fully stirred and mixed evenly. The light conversion granules can be fluorescent powder, KSF or quantum dots. The stirring can be achieved by mechanical stirring with a stirring paddle, and in this embodiment, it is achieved by magnetic stirring.

[0041] Continue to refer to Figure 1, the transfer mechanism 300 includes a syringe 310, a support frame 320 for fixing the syringe barrel of the syringe 310, a cylinder 330 fixed on the support frame 320 to drive the piston rod of the syringe 310, a Z-direction linear movement mechanism 340, an X-direction linear movement mechanism 350, and a Y-direction linear movement mechanism 360. The support frame 320 is connected to the Z-direction linear movement mechanism 340, and the Z-direction linear movement mechanism 340 is connected to the X-direction linear movement mechanism 350. The two ends of the Z-direction linear movement mechanism 340 and the X-direction linear movement mechanism 350 are mounted between two parallel guide rails of the Y-direction linear movement mechanism 360. Through the three-degree-of-freedom movement mechanism, the syringe 310 can perform linear motion in the X-direction, Y-direction, and Z-direction, and the purpose of transferring the stirred slurry in the premixing tank 200 to the anti-settling light conversion granule feeding mechanism 400 can be achieved.

[0042] Each moving mechanism can be implemented in various ways. In this embodiment, a guide rail and slider mechanism is used to implement it, and the specific design details can refer to the prior art.

[0043] As Figure 2 and 3 shown, the anti-settling light conversion granule feeding mechanism 400 includes a carrier table 410, a rotating motor 420 fixed on the carrier table 410, a driving gear 431 connected to the output shaft of the rotating motor 420, a transmission gear 432 meshing with the driving gear 431, a self-rotating feeding cylinder 440, and a syringe head 450 provided at the lower part of the self-rotating feeding cylinder 440. Continuing to refer to Figure 3 , a first bearing 461 is provided between the rotating shaft of the transmission gear 432 and the carrier table 410, and a second bearing 462 is provided between the self-rotating feeding cylinder 440 and the carrier table 410.

[0044] As Figures 3 - 5 shown, the self-rotating feeding cylinder 440 includes a cylindrical body 441, a cylindrical accommodating cavity 442 provided in the body 441, a connecting head 443 provided at the bottom of the body 441 for installing the syringe head 450, and a wave wheel 444 at the bottom of the accommodating cavity 442. The outer wall of the body 441 is provided with a driven gear 433 meshing with the transmission gear 432, and the accommodating cavity 442 communicates with the connecting head 443.

[0045] Through the transmission mechanism 430 of the driving gear, the transmission gear, and the driven gear, the rotation of the self-rotating feeding cylinder 440 is driven by the rotating motor 420.

[0046] Continuing to refer to Figure 4 and 5 , the wave wheel 444 is four evenly distributed triangular protrusions.

[0047] As Figure 2As shown, a stage 510 is provided in the workpiece groove 500. The self-rotating filling cylinder 440 located above the stage 510 coats the slurry on the target object, and the target object is the water surface or the substrate.

[0048] As Figure 1 shown, in this embodiment, the workpiece groove 500 is divided into a first groove 520 and a second groove 530, and a stage 510 is provided in each of the two grooves. At this time, the anti-settling light conversion granule feeding mechanism 400 is as Figure 1 shown, adding a moving mechanism according to the groove setting direction, which is the X-direction self-rotating filling cylinder moving mechanism 470 in the figure. The carrier table 410 is connected to the X-direction self-rotating filling cylinder moving mechanism 470, so that the self-rotating filling cylinder 410 can move in the X direction.

[0049] Briefly describe the working process of the coating system:

[0050] First, weigh the light conversion granule and the dispersion medium according to the ratio and place them in the premixing tank 200 for sufficient and continuous stirring. Drive the transfer mechanism 30 above the premixing tank 200, open the lid of the premixing tank 200, extract the slurry, and then drive the transfer mechanism 30 to make the syringe 310 located at the self-rotating filling cylinder 440. Press down the piston rod of the syringe 310 to introduce the slurry into the accommodating cavity 442 of the continuously rotating self-rotating filling cylinder 440. Since the accommodating cavity 442 has sufficient height, it is ensured that the slurry will not fly out or leak from the bottom of the accommodating cavity 442. Control a certain rotation speed to make the slurry in the accommodating cavity 442 form a vortex. After being uniform and stable, reduce the rotation speed of the self-rotation. The slurry slowly and evenly flows out from the bottom of the accommodating cavity 442 and is coated on the target object through the syringe head 450, and uniform coating can be achieved.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features, and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A coating system, characterized in that, the coating system comprises a workbench, a premixing tank arranged on the workbench, a transfer mechanism, a light conversion granule feeding mechanism for preventing precipitation, and a workpiece tank located below the light conversion granule feeding mechanism for preventing precipitation; the light conversion granule feeding mechanism for preventing precipitation comprises a rotating motor and a transmission mechanism connected to the rotating motor, a self-rotating feeding cylinder connected to the transmission mechanism, and a syringe head arranged at the lower part of the self-rotating feeding cylinder. The rotating motor provides power and drives the self-rotating feeding cylinder to rotate through the transmission mechanism. The self-rotation of the self-rotating feeding cylinder makes the slurry form a vortex. The self-rotating feeding cylinder comprises a cylindrical body, a cylindrical accommodating cavity arranged in the body, and a connecting head arranged at the bottom of the body for installing the syringe head. The accommodating cavity is communicated with the connecting head. After being uniform and stable, the rotation speed is reduced, and the slurry flows through the syringe head from the bottom of the accommodating cavity and is coated on the target object. The transmission mechanism comprises a driving gear arranged on the output shaft of the rotating motor and a driven gear arranged on the self-rotating feeding cylinder. The rotation speed of the self-rotating feeding cylinder is controlled through the transmission mechanism to make the slurry form a vortex and flow out from the bottom of the vortex; the transfer mechanism comprises a syringe, a support frame for fixing the syringe barrel, a cylinder for driving the piston rod of the syringe fixed on the support frame, a Z-direction linear movement mechanism, an X-direction linear movement mechanism, and a Y-direction linear movement mechanism. The support frame is connected to the Z-direction linear movement mechanism, and the Z-direction linear movement mechanism is connected to the X-direction linear movement mechanism. Both ends of the Z-direction linear movement mechanism and the X-direction linear movement mechanism are mounted between two parallel guide rails of the Y-direction linear movement mechanism. Through the three-degree-of-freedom movement mechanism, the syringe can perform linear movement in the X-direction, Y-direction, and Z-direction; the transfer mechanism extracts the slurry from the premixing tank and quantitatively introduces it into the self-rotating feeding cylinder, and then coats it on the target object in the workpiece tank.

2. The coating system according to claim 1, characterized in that, a wave wheel is arranged at the bottom of the accommodating cavity.

3. The coating system according to claim 1, characterized in that, the light conversion granule feeding mechanism for preventing precipitation further comprises a carrying platform for carrying the rotating motor, the transmission mechanism, and the self-rotating feeding cylinder. The self-rotating feeding cylinder is connected to the carrying platform through a bearing.

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