Glue injection packaging equipment for LED lamp bead processing

Abstract

The invention relates to the field of LED lamp bead packaging, in particular to LED lamp bead processing glue injection packaging equipment which comprises a mounting shell, a glue injection barrel is fixedly connected in the mounting shell, a glue injection pipe is fixedly connected to the side wall of the glue injection barrel, a first one-way valve is arranged in the glue injection pipe, a partition plate is fixedly connected in the glue injection barrel, and a second one-way valve is arranged in the partition plate. And the bottom end of the partition plate is fixedly connected with a glue discharging pipe. By arranging the partition plate, the first one-way valve, the second one-way valve and the negative pressure assembly, when glue injection is finished, the first piston is inserted into and seals the glue discharging pipe, glue is prevented from continuously flowing out, the negative pressure assembly is started, negative pressure pumping is conducted on the isolated lower cavity, and the powerful negative pressure completely acts on residual glue at an outlet of the glue injection head; therefore, the residual glue at the glue injection head can be quickly sucked back, and the pulled glue thread or the glue section to be drawn can be completely and neatly sucked back, so that the residual drawn wire can be reduced when the glue injection head is separated from the workpiece.

Description

Technical Field

[0001] This invention relates to the field of LED chip packaging, and more particularly to an LED chip processing and encapsulation equipment. Background Technology

[0002] The packaging quality of LED chips directly affects their optical performance, lifespan, and reliability. During the packaging process, a dispensing process is commonly used to precisely apply encapsulating adhesives (such as epoxy resin and silicone) to the chip and bonding wire areas to achieve sealing protection, stress buffering, and optical lens shaping. Currently, time-pressure or screw pump dispensing equipment is widely used in the industry.

[0003] However, during high-speed precision dispensing, especially when handling medium-to-high viscosity encapsulating adhesives, the adhesive is prone to stringing at the moment of separation between the needle and the substrate due to the cohesive force of the adhesive. This can easily cause residual adhesive threads to overlap onto non-encapsulated areas, resulting in contamination, short circuits, or appearance defects, which can easily impair product yield.

[0004] To address these issues, this invention proposes an LED bead processing and encapsulation equipment. Summary of the Invention

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: an LED lamp bead processing and encapsulation equipment, comprising: a mounting shell, an encapsulation barrel fixedly connected inside the mounting shell, an encapsulation tube fixedly connected to the side wall of the encapsulation barrel, a first one-way valve provided inside the encapsulation tube, a partition fixedly connected inside the encapsulation barrel to divide the encapsulation barrel into an upper cavity and a lower cavity, an encapsulation discharge pipe fixedly connected to the bottom end of the partition, and a second one-way valve provided inside the encapsulation discharge pipe; The first piston is slidably connected in the glue injection barrel, and a sealing rod that matches the diameter of the glue discharge pipe is fixedly connected to the bottom end of the first piston. The negative pressure component is activated after the sealing rod is inserted into the dispensing tube. It is used to generate negative pressure in the lower cavity so that the dispensing head at the bottom of the dispensing barrel can draw back the encapsulating adhesive, thereby drawing back the stringy encapsulating adhesive.

[0006] Preferably, the negative pressure component includes: A compression shell is fixedly connected to the side wall of the glue injection barrel. A second piston is slidably connected inside the compression shell. A first spring is fixedly connected between the second piston and the compression shell. A push seat is fixedly connected to the end of the second piston. The snap-fit ​​positioning mechanism is used to drive and lock the push seat and the second piston during the upward glue filling process of the first piston, so that the lower cavity is pre-stored with positive pressure; and when the first piston moves downward to the sealing rod inserting into the glue discharge tube, it is unlocked, so that the first spring drives the second piston to move quickly, thereby generating negative pressure in the lower cavity and glue head flow channel for back suction and stringing.

[0007] Preferably, the negative pressure assembly further includes a recovery mechanism for recovering residual adhesive in the dispensing head when the second piston moves, causing positive pressure in the lower cavity.

[0008] Preferably, the recycling facility includes: A three-way ball valve is rotatably connected inside the glue injection head. Rotating shafts are symmetrically fixedly connected to both sides of the three-way ball valve. The rotating shafts pass through the outer wall of the glue injection head and are rotatably connected to the glue injection head. The recovery tube is fixedly connected to the side wall of the dispensing head at the position corresponding to the three-way ball valve; A rotary drive mechanism is used to drive the three-way ball valve to rotate. When the rotary drive mechanism drives the three-way ball valve to rotate to the first position, the dispensing head flow channel is opened. When the three-way ball valve is driven to rotate to the second position, the dispensing head is sealed, and the three-way ball valve is connected to the recovery pipe.

[0009] Preferably, the rotary drive mechanism includes: Two gears, each fixedly connected to a rotating shaft; The L-shaped rack meshes with the side of the gear, and the top end of the L-shaped rack passes through the bottom end of the mounting housing and is slidably connected to the mounting housing. The top end of the L-shaped rack is fixedly connected to a first push block and a second push block. A cylinder is fixedly connected inside the mounting housing. The end of the cylinder's telescopic rod passes through the first push block and is slidably connected to the first push block. A push plate is fixedly connected to the end of the telescopic rod.

[0010] Preferably, the snap-fit ​​positioning mechanism includes: Two locking blocks are symmetrically and fixedly connected to both sides of the push base; Two locking seats that engage with the locking block are symmetrically slidably connected on both sides of the compression shell, and a second spring is fixedly connected between the locking seats and the compression shell.

[0011] Preferably, the snap-fit ​​positioning mechanism further includes a connecting plate, which is fixedly connected to the rod of the first piston; The L-shaped connecting frame has its top end fixedly connected to the connecting plate, and its bottom end rotatably connected to a push roller.

[0012] Preferably, the snap-fit ​​positioning mechanism further includes: Two compression blocks are fixedly connected to the side walls of two snap-fit ​​seats respectively; Two extrusion rods are fixedly connected to the bottom of the connecting plate and correspond to the position of the extrusion block. When the first piston moves downward and inserts the sealing rod into the glue injection tube, the extrusion rods push the extrusion block, causing the snap-fit ​​seat to move and release the positioning of the snap-fit ​​block.

[0013] Preferably, it also includes a linkage mechanism for linkage control of the first piston movement and ball valve switching, the linkage mechanism including: Two drive plates are symmetrically fixedly connected to the bottom of the L-shaped connecting frame. The side wall of each drive plate is provided with a drive groove, which includes a first straight groove, an inclined groove, and a second straight groove. The U-shaped push frame is fixedly connected to the telescopic rod of the cylinder. The top of the U-shaped push frame is symmetrically fixedly connected with sliding pins, which are slidably connected in the drive groove.

[0014] Compared with the prior art, the present invention has the following beneficial effects: I. This invention, by setting up a partition, a first one-way valve, a second one-way valve, and a negative pressure component, allows the first piston to be inserted and seal the glue discharge pipe at the end of glue injection, preventing the glue from continuing to flow out. The negative pressure component is activated to draw negative pressure into the isolated lower cavity. The powerful negative pressure will act entirely on the glue residue at the glue injection head outlet, thereby quickly drawing back the residual glue at the glue injection head and cleanly and neatly pulling back the glue strands that have been pulled out or are about to be pulled out. This helps to reduce the residual stringing when the glue injection head separates from the workpiece.

[0015] Second, by setting up a compression shell, a second piston, and a snap-fit ​​positioning mechanism, this invention enables the snap-fit ​​blocks on both sides of the snap-fit ​​seat and the push seat to disengage when the glue is injected. Under the action of the first spring, the push seat drives the second piston to move, causing a moving negative pressure to be generated instantaneously in the compression shell and acting on the lower cavity, thereby quickly sucking back the residual glue at the glue injection head and cleanly and neatly pulling back the glue filaments that have been pulled out or are about to be pulled out, which helps to reduce the residual filaments when the glue injection head separates from the workpiece.

[0016] Third, this invention, by setting up a three-way ball valve and a recovery pipe, after the negative pressure back suction action is completed, the three-way ball valve rotates to the second position. At this time, the dispensing head is sealed, and the three-way ball valve is connected to the recovery pipe. When the dispensing tank needs to be replenished with encapsulating glue, the second piston moves, increasing the pressure in the lower cavity. This causes the residue at the dispensing head to be squeezed through the three-way ball valve and discharged into the recovery pipe. On the one hand, the outlet of the dispensing head facing the substrate is completely sealed, achieving a seal on the dispensing head and isolating it from the external environment. On the other hand, the back-suctioned residual glue is discharged from the dispensing head, ensuring that the glue coming out of the dispensing head in a stable state each time glue is dispensed, avoiding product defects caused by poor state of residual glue at the front end. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 for Figure 1 Enlarged view of point A in the middle; Figure 3 This is a cross-sectional view of the mounting shell of the present invention; Figure 4 for Figure 3 Enlarged view at point B in the middle; Figure 5 This is a schematic diagram showing the connection between the glue injection tank and the compression shell in this invention; Figure 6 This is a schematic diagram showing the connection between the compression shell and the push base in this invention; Figure 7 This is a schematic diagram showing the connection between the L-shaped connecting frame and the drive board in this invention.

[0018] In the diagram: 1. Mounting housing; 2. Glue injection bucket; 201. Glue injection head; 3. Glue injection tube; 4. First one-way valve; 5. Partition plate; 6. Glue discharge tube; 7. Second one-way valve; 8. First piston; 9. Sealing rod; 10. Compression housing; 11. Second piston; 12. First spring; 13. Push seat; 1301 snap-fit ​​block; 14. Second spring; 15. Connecting plate; 16. L-shaped connecting frame; 17. Push roller; 18. Extrusion block; 19. Extrusion rod; 20. Drive plate; 21. Drive groove; 22. U-shaped push frame; 23. Sliding pin; 24. Three-way ball valve; 25. Rotating shaft; 26. Recovery tube; 27. Gear; 28. L-shaped rack; 29. ​​First push block; 30. Second push block; 31. Cylinder; 32. Push plate; 33. Detailed Implementation

[0019] The following description is intended to disclose the invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious modifications will occur to those skilled in the art.

[0020] like Figures 1 to 7 The LED bead processing and encapsulation equipment shown includes: Mounting housing 1, with a glue injection tank 2 fixedly connected inside the mounting housing 1, a glue injection tube 3 fixedly connected to the side wall of the glue injection tank 2, a first one-way valve 4 installed inside the glue injection tube 3, a partition 5 fixedly connected inside the glue injection tank 2 to divide the glue injection tank 2 into an upper cavity and a lower cavity, a glue discharge tube 6 fixedly connected to the bottom end of the partition 5, and a through hole communicating with the glue discharge tube 6 in the middle of the partition 5, the through hole of the partition 5 being consistent with the inner diameter of the glue discharge tube 6, and a second one-way valve 7 installed inside the glue discharge tube 6; a first piston 8, which is slidably connected inside the glue injection tank 2, with a sealing rod 9 fixedly connected to the bottom end of the first piston 8 that matches the diameter of the glue discharge tube 6; a negative pressure assembly, which is activated after the sealing rod 9 is inserted into the glue discharge tube 6, to generate negative pressure in the lower cavity, so that the glue injection head 201 at the bottom end of the glue injection tank 2 draws back the encapsulating glue, thereby drawing back the stringy encapsulating glue; In existing technologies, during high-speed precision dispensing, especially when handling medium-to-high viscosity encapsulating adhesives, the adhesive is prone to stringing at the moment of separation between the nozzle and the substrate due to the cohesive force of the adhesive. This can easily lead to residual adhesive strings overlapping onto non-encapsulated areas, causing contamination, short circuits, or appearance defects, which can easily impair product yield. This technical solution can solve the above problems, and the specific operation is as follows: The mounting housing 1 is driven to move to a designated position by an external guide component (e.g., a guide rail). Then, the first piston 8 is driven to move downward by a drive device (e.g., an electric cylinder). This causes the first piston 8 to compress the encapsulating adhesive in the upper cavity, increasing its pressure. Under the pressure, the encapsulating adhesive pushes open the second one-way valve 7 in the dispensing tube 6. The encapsulating adhesive flows through this tube to the dispensing head 201 at the bottom of the dispensing tank 2 and is finally squeezed out, thus being injected into the predetermined encapsulation position of the LED bead. At this time, due to the direction of pressure and the setting of the first one-way valve 4, the dispensing tube 3 is in a closed state, and the adhesive will not flow through this path. When the required amount of adhesive is reached, the sealing rod 9 is inserted and tightly blocks the upper opening of the dispensing pipe 6, thereby sealing the adhesive path. At the same time, the negative pressure component is activated, quickly forming a negative pressure in the lower cavity and the flow channel space of the dispensing head 201. Since the sealing rod 9 has sealed the upper passage, the strong negative pressure will act entirely on the adhesive residue at the outlet of the dispensing head 201, thereby quickly sucking back the residual adhesive at the dispensing head 201 and cleanly and neatly pulling back the pulled adhesive strands or adhesive segments that are about to be pulled, thus helping to reduce the residual strands when the dispensing head 201 is separated from the workpiece. After the glue injection is completed, the first piston 8 moves upward, and a negative pressure gradually forms in the upper cavity of the glue injection barrel 2. Under the action of the negative pressure, the second one-way valve 7 seals the glue discharge pipe 6, and the first one-way valve 4 is pushed open, so that the encapsulating glue is replenished into the upper cavity of the glue injection barrel 2 through the glue injection pipe 3, in preparation for the next glue injection and encapsulation.

[0021] It should be noted that when dispensing is required, the upper and lower cavities of the entire dispensing barrel 2 are filled with encapsulating adhesive. After dispensing is completed, the first piston 8 is positioned above the dispensing tube 3. This ensures that the dispensing tube 3 can smoothly replenish adhesive when the first piston 8 moves upward.

[0022] As a further embodiment of the present invention, the negative pressure component includes a compression shell 10, which is fixedly connected to the side wall of the glue injection barrel 2. A second piston 11 is slidably connected inside the compression shell 10, and a first spring 12 is fixedly connected between the second piston 11 and the compression shell 10. A push seat 13 is fixedly connected to the end of the second piston 11. The snap-fit ​​positioning mechanism is used to drive and lock the push seat 13 and the second piston 11 during the upward glue filling process of the first piston 8, so that the lower cavity is pre-stored with positive pressure; and when the first piston 8 moves downward to the sealing rod 9 and inserts into the glue discharge tube 6, the locking is released, so that the first spring 12 drives the second piston 11 to move quickly away from the glue injection barrel 2, thereby generating negative pressure in the lower cavity and the flow channel of the glue injection head 201 for back suction and stringing. The snap-fit ​​positioning mechanism includes two snap-fit ​​blocks 1301, which are symmetrically fixedly connected to both sides of the push base 13; and two snap-fit ​​seats 14 that snap-fit ​​with the snap-fit ​​blocks 1301, which are symmetrically slidably connected to both sides of the compression shell 10 (the snap-fit ​​seats 14 are slidably sleeved on the guide posts on the outer wall of the compression shell 10). A second spring 15 is fixedly connected between the snap-fit ​​seats 14 and the compression shell 10 (the second spring 15 is sleeved on the guide posts). The snap-fit ​​positioning mechanism also includes a connecting plate 16, which is fixedly connected to the rod of the first piston 8; and an L-shaped connecting frame 17, the top of which is fixedly connected to the connecting plate 16, and the bottom of which is rotatably connected to a push roller 18. The snap-fit ​​positioning mechanism also includes two pressing blocks 19, which are fixedly connected to the side walls of the two snap-fit ​​seats 14 respectively; and two pressing rods 20, which are fixedly connected to both sides of the middle part of the connecting plate 16 in the vertical direction and correspond to the positions of the pressing blocks 19; when the first piston 8 moves downward to insert the sealing rod 9 into the glue discharge tube 6, the pressing rods 20 push the pressing blocks 19, causing the snap-fit ​​seats 14 to move and release the positioning of the snap-fit ​​blocks 1301; Specifically, before the equipment is started, the first piston 8 is at the top of the glue injection barrel 2. When glue injection is required, the first piston 8 moves downward. Under the connection of the connecting plate 16, the L-shaped connecting frame 17 and the extrusion rod 20 move downward. The extrusion rod 20 pushes the extrusion block 19 on the side wall of the snap-fit ​​seat 14, forcing the two snap-fit ​​seats 14 to slide to both sides against the elastic force of the second spring 15. This causes the snap-fit ​​seats 14 to disengage from the snap-fit ​​blocks 1301 on both sides of the push seat 13. Under the action of the first spring 12, the push seat 13 drives the second piston 11 to move quickly away from the glue injection barrel 2, causing a moving negative pressure to be generated instantaneously in the compression shell 10 and acting on the lower cavity. This quickly draws back the residual glue at the glue injection head 201, so as to cleanly and neatly pull back the glue filaments that have been pulled out or the glue segments that are about to be pulled out. This helps to reduce the residual filaments when the glue injection head 201 is separated from the workpiece.

[0023] When the glue injection tank 2 needs to be refilled, the first piston 8 moves upward. Under the action of the connecting plate 16, the L-shaped connecting frame 17 and the extrusion rod 20 move upward. During this process, the extrusion rod 20 cancels the extrusion action on the extrusion block 19. Under the action of the second spring 15, the snap-fit ​​seat 14 resets. Then, the push roller 18 at the bottom of the L-shaped connecting frame 17 presses the push seat 13. The push seat 13 drives the second piston 11 to move closer to the inside of the glue injection tank 2. The first spring 12 is stretched to generate elastic force. During the movement of the push seat 13, the inclined surfaces at the ends of the snap-fit ​​blocks 1301 on both sides of the push seat 13 interact with the inclined surfaces at the ends of the snap-fit ​​seat 14, causing the snap-fit ​​seat 14 to move. After the snap-fit ​​blocks 1301 have completely passed through, the snap-fit ​​seat 14 resets, thereby achieving the positioning of the push seat 13. After the next glue injection is completed, the glue will be sucked back to reduce stringing.

[0024] As a further embodiment of the present invention, the negative pressure assembly also includes a recovery mechanism for recovering residual glue in the glue injection head 201 when the second piston 11 is reset and the lower cavity generates positive pressure. Specifically, the recycling mechanism includes a three-way ball valve 25, which is rotatably connected inside the dispensing head 201. Rotating shafts 26 are symmetrically fixedly connected to both sides of the three-way ball valve 25, and these shafts 26 penetrate the outer wall of the dispensing head 201 and are rotatably connected to it. A recycling pipe 27 is fixedly connected to the side wall of the dispensing head 201 at a position corresponding to the three-way ball valve 25. A rotary drive mechanism is used to drive the three-way ball valve 25 to rotate. When the rotary drive mechanism drives the three-way ball valve 25 to rotate to the first position, the flow channel of the dispensing head 201 is open. When the three-way ball valve 25 is driven to rotate to the second position, the dispensing head 201 is sealed, and the three-way ball valve 25 is connected to the recycling pipe 27. The rotary drive mechanism includes two gears 28, which are fixedly connected to the rotating shaft 26; an L-shaped rack 29, which meshes with the side of the gears 28, and the top end of the L-shaped rack 29 passes through the bottom end of the mounting shell 1 and is slidably connected to the mounting shell 1; a first push block 30 and a second push block 31 are fixedly connected to the top end of the L-shaped rack 29; and a cylinder 32, which is fixedly connected inside the mounting shell 1. The end of the telescopic rod of the cylinder 32 passes through the first push block 30 and is slidably connected to the first push block 30; a push plate 33 is fixedly connected to the end of the telescopic rod. During dispensing intervals, residual adhesive remaining inside the dispensing head 201 is prone to solidification due to air exposure, eventually clogging the precision needle. This necessitates frequent machine shutdowns for manual cleaning or replacement, impacting work efficiency. This technical solution can resolve the above problems. The specific operation is as follows: When the negative pressure back suction action is completed, the cylinder 32 is activated, its telescopic rod extends outward, and the push plate 33 fixed at the end of the telescopic rod moves accordingly. The push plate 33 pushes the second push block 31, causing the L-shaped rack 29 to move, thereby driving the gear 28 to rotate 90 degrees, the three-way ball valve 25 to rotate 90 degrees, and the three-way ball valve 25 rotates to the second working position. At this time, the glue injection head 201 is sealed, and the three-way ball valve 25 is connected to the recovery pipe 27. When the glue dispensing tank 2 is replenishing the encapsulating glue, the second piston 11 will move towards the inside of the glue dispensing tank 2, increasing the pressure in the lower cavity, so that the residue at the glue dispensing head 201 is squeezed through the three-way ball valve 25 and discharged into the recycling pipe 27. On the one hand, the outlet of the dispensing head 201 facing the substrate is completely sealed, thus sealing the dispensing head 201 and isolating it from the external environment; on the other hand, the residual glue sucked back is discharged from the dispensing head 201, ensuring that the glue coming out of the dispensing head 201 is in a stable state each time glue is dispensed, avoiding product defects caused by poor state of residual glue at the front end.

[0025] After the residual adhesive is discharged, the telescopic rod of the cylinder 32 continues to retract. During the retraction process, the push plate 33 contacts and pulls the first push block 30, driving the L-shaped rack 29 to move in the opposite direction, thereby driving the three-way ball valve 25 to rotate ninety degrees through the gear 28. When the three-way ball valve 25 rotates to the first position, the flow channel of the glue injection head 201 is opened.

[0026] As a further embodiment of the present invention, it also includes a linkage mechanism for linkage control of the movement of the first piston 8 and the switching of the three-way ball valve 25. The linkage mechanism includes two drive plates 21, which are symmetrically fixedly connected to the bottom end of the L-shaped connecting frame 17. The drive plates 21 have drive grooves 22 on their side walls. The drive includes a first straight groove, an inclined groove, and a second straight groove. A U-shaped push frame 23 is fixedly connected to the telescopic rod of the cylinder 32. The top of the U-shaped push frame 23 is symmetrically fixedly connected to sliding pins 24, which are slidably connected in the drive grooves 22. Specifically, when glue needs to be injected, the telescopic rod of the cylinder 32 extends, the push plate 33 moves towards the second push block 31, and at the same time the U-shaped push frame 23 moves, causing the sliding pin 24 to move along the drive groove 22. The sliding pin 24 moves along the first straight groove first, and will not generate lateral or longitudinal thrust on the drive plate 21. Therefore, the L-shaped connecting frame 17 and the first piston 8 remain stationary. When the sliding pin 24 finishes the first straight groove and enters the inclined groove, the inclined surface of the inclined groove will convert the horizontal movement of the sliding pin 24 into a vertical component force on the drive plate 21, thereby driving the L-shaped connecting bracket 17 to move down, and driving the connecting plate 16 and the first piston 8 fixedly connected to it to move down synchronously, thereby realizing glue injection. After the sliding pin 24 passes through the inclined groove, it enters the second straight groove and moves along the second straight groove. At this time, the drive plate 21 does not move, and the push plate 33 pushes the second push block 31 to move, so that the three-way ball valve 25 rotates to the second position, so that the glue injection head 201 is sealed, and the three-way ball valve 25 is connected to the recovery pipe 27. When the glue dispensing tank 2 is replenished, the telescopic rod of the cylinder 32 retracts, the first piston 8 moves upward, and the second piston 11 resets. The pressure in the lower cavity increases, thereby discharging the residual glue in the glue dispensing head 201 until the sliding pin 24 slides along the first straight groove. At this time, the first piston 8 and the second piston 11 stop moving, and the push plate 33 pushes the first push block 30, causing the three-way ball valve 25 to rotate to the first position, opening the flow channel of the glue dispensing head 201, preparing for the next glue dispensing.

[0027] The working principle of this invention is as follows: Initial state: The first piston 8 is located on the upper position of the glue injection barrel 2, and the locking and positioning mechanism locks the push seat 13 and the second piston 11. The first spring 12 is in a compressed and energy-storing state, and the three-way ball valve 25 is in the first position with the glue injection channel open. The glue injection barrel 2 has been pre-stored with glue liquid.

[0028] During glue injection, the telescopic rod of cylinder 32 begins to extend. Through the movement of the sliding pin 24 of U-shaped push frame 23 in the inclined groove of drive plate 21, the horizontal thrust of cylinder 32 is converted into the force that drives L-shaped connecting frame 17 and first piston 8 to move downward. The first piston 8 presses down, compressing the glue in the upper cavity. The glue pushes open the second one-way valve 7 of glue discharge pipe 6 and is squeezed out through glue injection head 201 to the predetermined encapsulation position of LED lamp bead. When the amount of glue injected reaches the required level, the sealing rod 9 is inserted and tightly blocks the upper opening of the glue discharge pipe 6, thereby sealing the upward supply passage of the glue. At the same time, the extrusion rod 20 below the connecting plate 16 pushes the extrusion block 19 on the side of the snap-fit ​​seat 14, forcing the snap-fit ​​seat 14 to move outward and release the lock on the snap-fit ​​block 1301 on the push seat 13. The released second piston 11 moves rapidly under the drive of the first spring 12, generating an instantaneous strong negative pressure in the lower cavity and the flow channel of the glue injection head 201. This negative pressure draws back the glue strands or residual glue stretched at the outlet of the glue injection head 201. As cylinder 32 continues to extend, sliding pin 24 enters the second straight groove section of drive plate 21. The position of first piston 8 remains unchanged. Push plate 33 at the front end of cylinder 32 extension rod contacts and pushes second push block 31 on L-shaped rack 29, driving L-shaped rack 29 to move. Through gear 28, it drives three-way ball valve 25 to rotate ninety degrees and switch to the second station. At this time, the outlet of dispensing head 201 pointing to the workpiece is completely closed, and its internal flow channel is connected to the side recovery pipe 27. When the glue injection tank 2 needs to be replenished, the telescopic rod of the cylinder 32 begins to retract, the sliding pin 24 moves in the inclined groove section of the drive plate 21, driving the L-shaped connecting frame 17 and the first piston 8 to move upward. The upward movement of the first piston 8 increases the volume of the upper cavity, forming a negative pressure. The glue from the external glue supply system pushes open the first one-way valve 4 of the glue injection tube 3, replenishing the upper cavity with new glue. At the same time, the push roller 18 at the bottom of the L-shaped connecting frame 17 contacts and drives the push seat 13 to move. The push seat 13 drives the second piston 11 to move, stretching the first spring 12 to store energy for the next back suction and forming a positive pressure in the lower cavity. This positive pressure forces the residual glue temporarily stored in the glue injection head 201 into the recovery tube 27 through the switched three-way ball valve 25, completing automatic cleaning. During this process, the locking blocks 1301 on both sides of the push seat 13 move to the locking seat 14 position and are relocked. Then, cylinder 32 continues to retract, sliding pin 24 enters the first straight groove section of drive plate 21, first piston 8 stops moving, push plate 33 on cylinder 32 telescopic rod contacts and pulls first push block 30 on L-shaped rack 29, driving L-shaped rack 29 to move in the opposite direction, driving three-way ball valve 25 to rotate ninety degrees, reset to the first station, the glue injection channel is reopened, all components return to the initial state, and the equipment is ready to execute the next glue injection cycle.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. An LED bead processing and encapsulation equipment, characterized in that, include: The mounting shell (1) is fixedly connected to the glue injection tank (2), the glue injection tank (2) is fixedly connected to the side wall of the glue injection tank (2), the glue injection pipe (3) is provided in the glue injection pipe (3), the glue injection pipe (3) is provided with a first one-way valve (4), the glue injection tank (2) is fixedly connected to the partition (5) to divide the glue injection tank (2) into an upper cavity and a lower cavity, the bottom end of the partition (5) is fixedly connected to the glue discharge pipe (6), the glue discharge pipe (6) is provided with a second one-way valve (7); The first piston (8) is sealed and slidably connected inside the glue injection barrel (2). The bottom end of the first piston (8) is fixedly connected with a sealing rod (9) that matches the diameter of the glue discharge pipe (6). The negative pressure assembly is activated after the sealing rod (9) is inserted into the glue discharge pipe (6). It is used to generate negative pressure in the lower cavity so that the glue dispensing head (201) at the bottom of the glue dispensing bucket (2) can draw back the encapsulating glue and draw back the stringy encapsulating glue.

2. The LED lamp bead processing and encapsulation equipment according to claim 1, characterized in that, The negative pressure component includes: A compression shell (10) is fixedly connected to the side wall of the glue injection barrel (2). A second piston (11) is sealed and slidably connected inside the compression shell (10). A first spring (12) is fixedly connected between the second piston (11) and the compression shell (10). A push seat (13) is fixedly connected to the end of the second piston (11). The snap-fit ​​positioning mechanism is used to drive and lock the push seat (13) and the second piston (11) during the upward glue filling process of the first piston (8), so that the lower cavity is pre-stored with positive pressure; and when the first piston (8) moves downward to the sealing rod (9) and inserts into the glue discharge tube (6), it is unlocked, so that the first spring (12) drives the second piston (11) to move quickly, thereby generating negative pressure in the lower cavity and the flow channel of the glue injection head (201) for back suction and stringing.

3. The LED lamp bead processing and encapsulation equipment according to claim 2, characterized in that, The negative pressure assembly also includes a recovery mechanism for recovering residual glue in the dispensing head (201) when the lower cavity is positively pressured during the reset of the second piston (11).

4. The LED lamp bead processing and encapsulation equipment according to claim 3, characterized in that, The recycling facility includes: A three-way ball valve (25) is rotatably connected inside the glue injection head (201). Rotating shafts (26) are symmetrically fixed on both sides of the three-way ball valve (25). The rotating shafts (26) pass through the outer wall of the glue injection head (201) and are rotatably connected to the glue injection head (201). The recovery pipe (27) is fixedly connected to the side wall of the dispensing head (201) at the position corresponding to the three-way ball valve (25); A rotary drive mechanism is used to drive the three-way ball valve (25) to rotate. When the rotary drive mechanism drives the three-way ball valve (25) to rotate to the first position, the flow channel of the dispensing head (201) is opened. When the three-way ball valve (25) is driven to rotate to the second position, the dispensing head (201) is sealed, and the three-way ball valve (25) is connected to the recovery pipe (27).

5. The LED lamp bead processing and encapsulation equipment according to claim 4, characterized in that, The rotary drive mechanism includes: Two gears (28) are fixedly connected to the rotating shaft (26); L-shaped rack (29), which meshes with the side of the gear (28), the top end of the L-shaped rack (29) passes through the bottom end of the mounting shell (1) and is slidably connected to the mounting shell (1), and the top end of the L-shaped rack (29) is fixedly connected with a first push block (30) and a second push block (31). The cylinder (32) is fixedly connected inside the mounting shell (1). The end of the telescopic rod of the cylinder (32) passes through the first push block (30) and is slidably connected to the first push block (30). The end of the telescopic rod is fixedly connected to a push plate (33).

6. The LED lamp bead processing and encapsulation equipment according to claim 5, characterized in that, The snap-fit ​​positioning mechanism includes: Two snap-fit ​​blocks (1301) are symmetrically fixedly connected to both sides of the push base (13); Two snap-fit ​​seats (14) are engaged with snap-fit ​​blocks (1301). The two snap-fit ​​seats (14) are symmetrically slidably connected on both sides of the compression shell (10). A second spring (15) is fixedly connected between the snap-fit ​​seats (14) and the compression shell (10).

7. The LED lamp bead processing and encapsulation equipment according to claim 6, characterized in that, The snap-fit ​​positioning mechanism also includes a connecting plate (16), which is fixedly connected to the rod of the first piston (8); L-shaped connecting frame (17), the top of which is fixedly connected to the connecting plate (16), and the bottom of which is rotatably connected to a push roller (18).

8. The LED lamp bead processing and encapsulation equipment according to claim 7, characterized in that, The snap-fit ​​positioning mechanism further includes: Two compression blocks (19) are fixedly connected to the side walls of two snap-fit ​​seats (14); Two extrusion rods (20) are fixedly connected to the two sides of the middle part of the connecting plate (16) in the vertical direction and correspond to the position of the extrusion block (19); when the first piston (8) moves downward to insert the sealing rod (9) into the glue discharge tube (6), the extrusion rods (20) push the extrusion block (19) to move the snap-fit ​​seat (14) to release the positioning of the snap-fit ​​block (1301).

9. The LED lamp bead processing and encapsulation equipment according to claim 7, characterized in that, It also includes a linkage mechanism for controlling the movement of the first piston (8) and the switching of the three-way ball valve (25), the linkage mechanism including: Two drive plates (21) are symmetrically fixedly connected to the bottom end of the L-shaped connecting frame (17). The drive plates (21) have drive grooves (22) on their side walls. The drive includes a first straight groove, an inclined groove and a second straight groove. U-shaped push frame (23) is fixedly connected to the telescopic rod of cylinder (32). The top of the U-shaped push frame (23) is symmetrically fixedly connected with sliding pins (24), which are slidably connected in the drive groove (22).

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