Tin plating process in LED bulb assembly

Abstract

The invention relates to the technical field of LED lamp production equipment, in particular to a tin plating process in LED bulb assembly, which comprises an aluminum substrate placing device, a tin plating device, a lamp bead mounting machine and a bulb mounting machine which are sequentially arranged outside a conveying device from front to back, a plurality of linearly-distributed placing frames used for placing aluminum substrates are conveyed on the top face of the conveying belt of the conveying device. According to the tin plating process in the LED bulb assembly, the detachable tin plating mold is installed below the pipe opening of the tin injection pipe of the tin plating machine, when aluminum substrates of different models and sizes are subjected to tin plating, the tin plating position and thickness can be adjusted only by replacing the tin plating mold, the debugging time of equipment is saved, and the working efficiency is improved. And meanwhile, the top surface of the movable mold in the tin coating mold is provided with the mold top sliding rod which can be connected in the fixed bracket in a sliding manner, so that the solder paste in the mold can be directly dried and shaped after tin coating is completed, the solder paste is prevented from flowing, and the quality and the stability of a welding point of the LED lamp bead are ensured.

Description

Technical Field

[0001] This invention relates to the field of LED lamp manufacturing equipment technology, and more specifically, to a tin-coating process in LED bulb assembly. Background Technology

[0002] The manufacturing process of LED lights involves bonding a semiconductor chip (LED bead) to a substrate using silver or white glue. The chip is then connected to an aluminum substrate using silver or gold wire, and the entire assembly is sealed with epoxy resin to protect the internal wiring. Finally, a housing is installed. Before soldering the aluminum substrate to the LED bead, a tinning process is typically performed. During tinning, the aluminum substrate is usually placed in a movable fixture, and a robotic arm of a tinning machine applies liquid tin to its surface. The thickness and uniformity of the tin coating are generally controlled manually by adjusting the robotic arm's speed and application pressure. The purpose of tinning is to enhance the conductivity and solderability of the aluminum substrate, while also protecting it from oxidation and corrosion.

[0003] Before and after tinning the aluminum substrate, cleaning the substrate and drying the solder paste are necessary. Cleaning removes impurities and contaminants that may affect solder paste adhesion and coating uniformity, leading to poor soldering or decreased electrical performance. Drying removes residual moisture from the coating surface, preventing cracks, blistering, or oxidation. However, in current bulb manufacturing processes, these two steps often require manual operation of separate equipment, resulting in discontinuity between the tinning process and the substrate's exposure to air during transport, making the tinning process susceptible to external influences. Furthermore, the tinning position and thickness vary depending on the type and size of the aluminum substrate, requiring extensive manual adjustments to the equipment.

[0004] In view of this, we propose a tin-coating process for LED bulb assembly.

[0005] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0006] The purpose of this invention is to provide a tin-coating process in LED bulb assembly to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A tin-coating process in LED bulb assembly includes the following steps:

[0009] I. Aluminum substrate placement stage

[0010] S1. Start the conveyor device, and drive the conveyor belt to move through the conveyor motor, so that several placement frames are transported sequentially and regularly from the outlet of the feeding device toward the aluminum substrate placement device.

[0011] S2. When the placement frame moves directly below the aluminum substrate placement device, turn off the conveying device and start the aluminum substrate placement device. Place the aluminum substrate that needs to be tinned directly below the bottom surface inside the fixed frame, and then start the conveying device again.

[0012] II. Cleaning Phase

[0013] S3. When the fixed frame moves with the aluminum substrate to the bottom of the cleaning section in the tin coating device, the blower motor is started to drive the blower fan to rotate, and airflow is formed at the bottom opening of the blower chamber. In conjunction with the transmission component, the round valve on the infusion tube is continuously opened and closed, and the alcohol in the storage tank is sprayed into the inside of the fixed frame through the spray nozzle, and then quickly dried.

[0014] III. Sealing Stage

[0015] S4. As the conveying device continues to move, the mating gear that is fixedly connected to the sealing part and the conveying roller in the tin coating device rotates continuously, which in turn drives the reduction gear to rotate, and then drives the frame protrusion and the sealing frame to change their position inside the tin coating chamber through the connecting rod.

[0016] S6. When the fixed frame moves to the front of the tin coating tank, the bottom surface of the sealing frame contacts the surface of the conveyor belt, and the sealing frame moves upward with the movement of the conveyor device. When the fixed frame moves to the bottom of the tin coating tank, the sealing frame resets and the conveyor device is turned off.

[0017] IV. Tin Coating Stage

[0018] S7. The built-in telescopic mechanism of the tin coating machine drives the tin-filling tube and the tin coating mold installed at the tube opening to move down. The movable mold continues to move down and presses down on the edge of the aluminum substrate, exposing the part of the aluminum substrate that needs to be tinned to the inside of the tin coating tank.

[0019] S8. Continue to control the telescopic mechanism to move down. After the position of the movable mold is fixed, the tin-coating head will continue to move down until the bottom of the tin-coating head is inserted into the inside of the tin-coating tank. Start the tin-coating machine and pour the tin directly into the inside of the tin-coating tank from the tin-coating head, so that the tin with the same thickness as the wall of the tin-coating tank covers the surface of the aluminum substrate.

[0020] S9. After the tin coating is completed, turn off the tin coating machine and start the built-in telescopic mechanism again to move the tin coating head up until the top surface of the fixed bracket contacts the bottom surface of the limit plate, then turn off the telescopic mechanism.

[0021] V. Drying Stage

[0022] S10. Start the blower in the drying section, and blow the airflow through the heater and out of the air guide chamber inside the tin coating chamber, thereby quickly shaping the tin coated on the surface of the aluminum substrate. Then the airflow returns to the interior of the drying chamber through the suction hood, forming a hot air circulation.

[0023] VI. LED installation stage

[0024] S11. After the tin coating on the aluminum substrate has set, start the conveying device and move the tin-coated aluminum substrate directly below the LED bead installation machine. Then start the LED bead installation machine and install LED beads at the designated positions.

[0025] VII. Light Bulb Installation Stage

[0026] S12. After the LED beads are installed, start the conveying device again to move the aluminum substrate to the bottom of the bulb mounting machine. Start the bulb mounting machine to complete the installation of the bulb outside the LED beads. Then, manually remove the assembled aluminum substrate along with the placement frame from the conveying device and send it to the subsequent lamp board assembly equipment.

[0027] The external components of the aforementioned conveying device are arranged sequentially from front to back as an aluminum substrate placement device, a tin coating device, a lamp bead installation machine, and a bulb installation machine. The top surface of the conveyor belt of the conveying device carries several linearly distributed placement frames for placing aluminum substrates.

[0028] The tin coating device includes a tin coating tank, a sealing part disposed on the outside of the tin coating tank wall, a drying part disposed on the inside of the tin coating tank wall, a tin coating machine disposed at the center of the inside of the tin coating tank, a tin coating mold disposed at the end of the tin injection tube of the tin coating machine, and a cleaning part disposed on the outer side wall of the front end of the tin coating tank.

[0029] The tin coating tank includes a fixed tank body with an open bottom, support columns located at the corners of the outer walls at both ends of the fixed tank body, a guide tank body located at the rear end of the fixed tank body near the open bottom, several regularly distributed guide plates located in the guide tank body, and a suction hood located at the front end of the fixed tank body near the open bottom.

[0030] The sealing part includes a sealing frame for ensuring the airtightness of the tin coating process, frame protrusions located on the outer side walls of the left and right ends of the sealing frame near the middle position, a connecting rod located at the center position of the outer side wall of the frame protrusions, a reduction gear located on the bottom end of the connecting rod, and a mating gear meshing with the reduction gear.

[0031] The drying section includes several drying chambers disposed inside a fixed chamber, a heater disposed on the top wall of the drying chamber near the rear end, and a blower disposed on the horizontal line in front of the heater.

[0032] The tin-coating mold includes a movable mold, a mold top slide bar located at the corner of the top surface of the movable mold, a limiting plate located on the top surface of the mold top slide bar, a tin-coating head located directly above the movable mold, and several fixed brackets arranged in a matrix on the top surface of the tin-coating head. The top surface of the movable mold has a tin-coating groove that runs vertically through the mold to determine the tin-coating area and thickness of the aluminum substrate.

[0033] The cleaning unit includes a cleaning chamber, a blower chamber located inside the cleaning chamber, a blower fan located inside the blower chamber, a blower motor located at one end of the blower fan's rotating rod, a liquid storage tank located above the blower chamber, an infusion pipe located on the outer wall of the bottom end of the liquid storage tank, a spray head located at the bottom end of the infusion pipe, and a transmission assembly located at the other end of the blower fan's rotating rod.

[0034] The placement frame includes a fixed frame with an open top and a positioning rod integrally formed inside the fixed frame at the bottom corner to determine the position of the movable mold after it moves down.

[0035] In the technical solution of the present invention, the top surface of the fixed chamber is provided with an installation groove that runs vertically through the chamber to provide a fixed area for the tin coating machine; the interior of the fixed chamber is provided with a frame-shaped groove with an inverted C-shaped longitudinal cross section; the bottom surface of the fixed chamber is provided with a sliding groove to provide a moving range for the sealing frame; and the bottom of the groove walls at both ends of the frame-shaped groove are provided with through holes that communicate with the interior of the fixed chamber.

[0036] In the technical solution of the present invention, the support column is fixedly connected to the outer side wall of the fixed chamber by bolts, the air guide chamber is fixedly connected to the outer side of the through hole communicating with the frame groove on the inner side wall of the fixed chamber by screws, the air guide plate is integrally formed with the air guide chamber, and the air suction hood is fixedly connected to the outer side of the through hole communicating with the frame groove on the inner side wall of the fixed chamber by screws.

[0037] In the technical solution of the present invention, the sealing frame is slidably connected to the inside of the groove, the frame protrusion is integrally formed with the sealing frame, the two ends of the connecting rod are respectively rotatably connected to the outer side wall of the frame protrusion and the outer side wall of the reduction gear through bearings, the reduction gear is rotatably connected to the outer side wall of the conveying support of the conveying device, and a wheel convex shaft is integrally formed at the center position of the docking gear and coaxially connected with the conveying roller inside the conveying device.

[0038] In the technical solution of the present invention, the drying chamber is fixedly connected to the inner wall of the frame-shaped groove by bolts, and the heater and the blower are both fixedly connected to the inner wall of the frame-shaped groove by screws. An extended chamber body extending to the outside of the top surface of the fixed chamber body is integrally formed on the top surface of the drying chamber body near the front end. A dustproof net is fixedly connected to the top opening of the extended chamber body by screws.

[0039] In the technical solution of the present invention, the fixing plate at the top of the tin coating machine is fixedly connected to the inner wall of the mounting groove by bolts. The corners of the movable mold are provided with mating holes of the same size and corresponding position as the positioning rod. The mold top slide rod is welded and fixed to the top surface of the movable mold. The limiting plate and the mold top slide rod are integrally formed. The mold top slide rod is slidably connected to the inside of the round hole at the end of the fixed bracket. The top of the tin coating head is integrally formed with a connecting pipe that connects to the bottom flange of the tin injection tube of the tin coating machine. The fixed bracket is welded and fixed to the top surface of the tin coating head.

[0040] In the technical solution of the present invention, the cleaning chamber is fixedly connected to the outer wall of the fixed chamber by bolts. The interior of the cleaning chamber is integrally formed with a partition plate for providing a placement position for the liquid storage tank. The blower chamber is fixedly connected to the inner wall of the cleaning chamber by bolts. The top chamber of the blower chamber extends to the outer side of the front side wall of the cleaning chamber, and the bottom chamber of the blower chamber extends to the outer side of the bottom surface of the cleaning chamber. The inner side of the opening of the top chamber of the blower chamber is fixedly connected with a filter screen for preventing external debris from entering by bolts.

[0041] In the technical solution of the present invention, the left and right ends of the central rotating rod of the blower fan pass through the outer side wall of the blower chamber and are rotatably connected to the inner side wall of the cleaning chamber. The blower motor is fixedly connected to the outer side wall of the cleaning chamber by bolts, and the output shaft of the blower motor is coaxially connected to the end of the rotating rod of the blower fan.

[0042] In the technical solution of the present invention, the liquid storage tank is placed on the top surface of the partition plate inside the cleaning chamber. A pressure valve for pressurizing the internal liquid is placed on one side of the liquid storage tank. The pressure valve is fixedly connected to the top surface of the partition plate by bolts. The two ends of the infusion pipe are respectively connected to the bottom surface of the outer wall of the liquid storage tank and the center of the top surface of the spray head with flanges. A tank round valve is integrally formed on the infusion pipe. The spray head is snapped and fixed inside the bottom through groove of the cleaning chamber. Several nozzles are linearly distributed and threaded on the bottom surface of the spray head.

[0043] In the technical solution of the present invention, the transmission assembly includes two meshing transmission gears. One of the transmission gears is fixedly connected to the outer side wall of the blower fan rotating rod near the end by a snap pin. The other transmission gear is rotatably connected to the inner side wall of the cleaning chamber. A wheel protrusion is fixedly connected inside the other transmission gear by a snap pin. The end of the wheel protrusion passes through the inner side wall of the tank valve and is coaxially connected to the rotating cylinder. The rotating cylinder is rotatably connected to the inside of the tank valve. Two symmetrically arranged and interconnected cylinder grooves are provided on the inner side wall of the rotating cylinder.

[0044] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0045] 1. The tin coating process in the LED bulb assembly has a drying section inside the tin coating tank and a cleaning section outside the tin coating tank, integrating the two processes before and after tin coating with the tin coating machine. During the transportation process of the conveying device, the mating gear in the sealing section is driven to rotate continuously, and the connecting rod and the sealing frame are driven to change their position continuously through the reduction gear, so as to ensure the sealing performance when tin coating the aluminum substrate and avoid interference from external factors.

[0046] 2. In the tinning process of this LED bulb assembly, a detachable tinning mold is installed below the tinning tube of the tinning machine. When tinning aluminum substrates of different models and sizes, only the tinning mold needs to be replaced to adjust the tinning position and thickness, saving equipment debugging time. At the same time, the top surface of the movable mold in the tinning mold is equipped with a mold top slide rod that can be slidably connected to the fixed bracket. After tinning is completed, the solder paste in the mold can be directly dried and shaped to avoid solder paste flow and ensure the quality and stability of the solder joint with the LED lamp beads. Attached Figure Description

[0047] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0048] Figure 2 This is a partial structural diagram of the present invention;

[0049] Figure 3 This is a schematic diagram of the tin-coating device in this invention;

[0050] Figure 4 This is a cross-sectional schematic diagram of the tin coating device in this invention;

[0051] Figure 5 This is a cross-sectional schematic diagram of the tin-coating tank structure in this invention;

[0052] Figure 6 This is an enlarged schematic diagram of part A in this invention;

[0053] Figure 7This is a schematic diagram of the sealing part in this invention;

[0054] Figure 8 This is a cross-sectional schematic diagram of the drying section in this invention;

[0055] Figure 9 This is a partial structural schematic diagram of the tin-coating device in this invention;

[0056] Figure 10 This is a structural breakdown diagram of the tin-coating mold in this invention;

[0057] Figure 11 This is a cross-sectional schematic diagram of the cleaning section in this invention;

[0058] Figure 12 This is a partial structural diagram of the cleaning section in this invention;

[0059] Figure 13 This is an enlarged schematic diagram of part B in this invention;

[0060] Figure 14 This is a schematic diagram of the transmission component in this invention;

[0061] Figure 15 This is a schematic diagram of the placement frame in this invention.

[0062] Explanation of reference numerals in the attached figures:

[0063] 1. Aluminum substrate placement device;

[0064] 2. Tin coating device; 20. Tin coating tank; 201. Fixed tank body; 2010. Mounting groove; 2011. Frame groove; 2012. Slide groove; 202. Support column; 203. Air guide chamber; 204. Air guide plate; 205. Suction hood; 21. Sealing part; 210. Sealing frame; 211. Frame protrusion; 212. Connecting rod; 213. Reduction gear; 214. Connecting gear; 22. Drying part; 220. Drying chamber body; 221. Heater; 222. Blower; 223. Dust filter; 23. Tin coating machine; 24. Tin coating mold; 2 40. Movable mold; 2401. Soldering tank; 2402. Connecting hole; 241. Mold top slide bar; 242. Limiting plate; 243. Soldering head; 244. Fixing bracket; 25. Cleaning section; 250. Cleaning chamber; 251. Blower chamber; 252. Filter screen; 253. Blower fan; 254. Blower motor; 255. Pressure valve; 256. Liquid storage tank; 257. Infusion pipe; 2570. Tank round valve; 258. Spray head; 259. Transmission assembly; 2590. Transmission gear; 2591. Wheel protrusion; 2592. Rotary drum;

[0065] 3. LED chip installation machine;

[0066] 4. Light bulb installation machine;

[0067] 5. Conveying device;

[0068] 6. Placement frame; 60. Fixing frame; 61. Positioning rod. Detailed Implementation

[0069] The technical solutions of this invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0070] Please see Figures 1-15 As shown, the present invention provides a technical solution:

[0071] A tin-coating process in LED bulb assembly includes the following steps:

[0072] I. Aluminum substrate placement stage

[0073] S1. Start the conveyor device 5, and drive the conveyor belt to move through the conveyor motor, so that several placement frames 6 are transported sequentially and regularly from the outlet of the feeding device towards the aluminum substrate placement device 1.

[0074] S2. When the placement frame 6 moves directly below the aluminum substrate placement device 1, turn off the conveying device 5 and start the aluminum substrate placement device 1. Place the aluminum substrate that needs to be tinned directly below the bottom surface inside the fixed frame 60, and then start the conveying device 5 again.

[0075] II. Cleaning Phase

[0076] S3. When the fixed frame 60 moves with the aluminum substrate to below the cleaning section 25 in the tin coating device 2, the blower motor 254 is started to drive the blower fan 253 to rotate, and an airflow is formed at the bottom opening of the blower chamber 251. In conjunction with the transmission component 259, the tank valve 2570 on the infusion tube 257 is continuously opened and closed, and the alcohol in the storage tank 256 is sprayed into the interior of the fixed frame 60 through the spray nozzle 258 and then quickly dried.

[0077] III. Sealing Stage

[0078] S4. As the conveying device 5 continues to move, the mating gear 214, which is fixedly connected to the conveying roller in the tin coating device 2, rotates continuously, which in turn drives the reduction gear 213 to rotate. This, in turn, drives the frame protrusion 211 and the sealing frame 210 to change their position inside the tin coating chamber 20 through the connecting rod 212.

[0079] S6. When the fixed frame 60 moves to the front of the tin coating tank 20, the bottom surface of the sealing frame 210 contacts the surface of the conveyor belt, and with the movement of the conveying device 5, the sealing frame 210 moves upward. When the fixed frame 60 moves to the bottom of the tin coating tank 20, the sealing frame 210 resets and the conveying device 5 is turned off.

[0080] IV. Tin Coating Stage

[0081] S7. The telescopic mechanism built into the tinning machine 23 drives the tin-filling tube and the tinning mold 24 installed at the tube opening to move down. The movable mold 240 continues to move down and presses down on the edge of the aluminum substrate, exposing the area of ​​the aluminum substrate that needs to be tinned to the inside of the tinning tank 2401.

[0082] S8. Continue to control the telescopic mechanism to move down. After the position of the movable mold 240 is fixed, the tin-coating head 243 will continue to move down until the bottom surface of the tin-coating head 243 is inserted into the interior of the tin-coating tank 2401. Start the tin-coating machine 23 to pour tin directly into the interior of the tin-coating tank 2401 from the tin-coating head 243, and cover the surface of the aluminum substrate with tin of the same thickness as the tank wall of the tin-coating tank 2401.

[0083] S9. After the tin coating is completed, turn off the tin coating machine 23 and start the built-in telescopic mechanism again to move the tin coating head 243 upward until the top surface of the fixed bracket 244 contacts the bottom surface of the limit plate 242, and then turn off the telescopic mechanism.

[0084] V. Drying Stage

[0085] S10. Start the blower 222 in the drying section 22, and blow the airflow through the heater 221 and out through the air guide chamber 203 inside the tin coating chamber 20, thereby quickly shaping the tin coated on the surface of the aluminum substrate. Then the airflow returns to the interior of the drying chamber 220 through the suction hood 205 to form a hot air circulation.

[0086] VI. LED installation stage

[0087] S11. After the tin coating on the aluminum substrate has set, start the conveying device 5 and move the tin-coated aluminum substrate directly below the LED bead installation machine 3. Then start the LED bead installation machine 3 and install LED beads at the designated positions.

[0088] VII. Light Bulb Installation Stage

[0089] S12. After the LED beads are installed, start the conveyor device 5 again to move the aluminum substrate directly under the bulb mounting machine 4. Start the bulb mounting machine 4 to complete the installation of the bulb outside the LED beads. Then, manually remove the assembled aluminum substrate along with the placement frame 6 from the conveyor device 5 and send it into the subsequent lamp board assembly equipment.

[0090] In this embodiment, as Figure 1 As shown, the external parts of the above-mentioned conveying device 5 are arranged from front to back as follows: aluminum substrate placement device 1, tin coating device 2, lamp bead installation machine 3 and bulb installation machine 4. The top surface of the conveyor belt of the conveying device 5 carries a number of linearly distributed placement frames 6 for placing aluminum substrates.

[0091] Furthermore, the placement frame 6 includes a fixed frame 60 with an open top and a positioning rod 61 integrally formed at the corner of the bottom surface inside the fixed frame 60 for determining the position of the movable mold 240 after it moves down.

[0092] Furthermore, the aluminum substrate placement device 1 is used to place the aluminum substrate into the placement frame 6, the tinning device 2 is used to clean the surface of the aluminum substrate, apply tin to the surface, and dry it after tinning, the LED bead mounting machine 3 is used to solder LED beads onto the surface of the aluminum substrate, the bulb mounting machine 4 is used to install the bulb on the outside of the LED beads, and the conveying device 5 is used to start the conveying motor and transport the placement frame 6 through the conveyor belt. The fixed frame 60 in the placement frame 6 is used to provide a placement platform for the aluminum substrate.

[0093] In this embodiment, as Figures 2-14 As shown, the tin coating device 2 includes a tin coating tank 20, a sealing part 21 disposed on the outside of the tin coating tank 20, a drying part 22 disposed on the inside of the tin coating tank 20, a tin coating machine 23 disposed at the center of the inside of the tin coating tank 20, a tin coating mold 24 disposed at the end of the tin injection tube of the tin coating machine 23, and a cleaning part 25 disposed on the outer side wall of the front end of the tin coating tank 20.

[0094] Specifically, the tin-coating tank 20 includes a fixed tank body 201 with an open bottom, support columns 202 located at the corners of the outer walls at both ends of the fixed tank body 201, a guide tank body 203 located on the rear wall of the fixed tank body 201 near the open bottom, several regularly distributed guide plates 204 located on the guide tank body 203, and a suction hood 205 located on the front wall of the fixed tank body 201 near the open bottom.

[0095] Furthermore, the top surface of the fixed chamber 201 is provided with an installation groove 2010 that runs vertically through the chamber to provide a fixed area for the tin coating machine 23; the interior of the fixed chamber 201 has a frame-shaped groove 2011 with an inverted chamfered longitudinal cross section; the bottom surface of the fixed chamber 201 has a sliding groove 2012 that provides a moving range for the sealing frame 210; and the bottom of the groove walls at both ends of the frame-shaped groove 2011 is provided with through holes that communicate with the interior of the fixed chamber 201.

[0096] Furthermore, the support column 202 is fixedly connected to the outer wall of the fixed chamber 201 by bolts, the air guide chamber 203 is fixedly connected to the outer side of the through hole communicating with the frame groove 2011 on the inner side wall of the fixed chamber 201 by screws, the air guide plate 204 is integrally formed with the air guide chamber 203, and the air suction hood 205 is fixedly connected to the outer side of the through hole communicating with the frame groove 2011 on the inner side wall of the fixed chamber 201 by screws.

[0097] Furthermore, the fixed chamber 201 is used to ensure the overall structural strength of the tin coating chamber 20, the frame groove 2011 is used to provide an installation area for the drying section 22, the slide 2012 is used to provide an up-and-down movement range for the sealing frame 210 in the sealing section 21, the support column 202 is used to ensure the overall structural stability of the tin coating chamber 20, the air guide chamber 203, together with the air guide plate 204, is used to blow the airflow blown out by the drying section 22 toward the surface of the aluminum substrate, and the suction hood 205 is used to return the internal hot air back to the interior of the drying chamber 220, forming a hot air circulation inside the tin coating chamber 20.

[0098] In this embodiment, as Figure 7 As shown, the sealing part 21 includes a sealing frame 210 for ensuring the airtightness of the tin plating process, frame protrusions 211 disposed on the outer side walls of the left and right ends of the sealing frame 210 near the middle position, a connecting rod 212 disposed on the center position of the outer side wall of the frame protrusion 211, a reduction gear 213 disposed on the bottom end of the connecting rod 212, and a mating gear 214 meshing with the reduction gear 213.

[0099] Furthermore, the sealing frame 210 is slidably connected to the inside of the slide groove 2012, the frame protrusion 211 is integrally formed with the sealing frame 210, the two ends of the connecting rod 212 are respectively rotatably connected to the outer side wall of the frame protrusion 211 and the outer side wall of the reduction gear 213 through bearings, the reduction gear 213 is rotatably connected to the outer side wall of the conveying bracket of the conveying device 5, and the center position of the mating gear 214 is integrally formed with a wheel body protrusion shaft that is coaxially connected with the conveying roller inside the conveying device 5.

[0100] Furthermore, after the mating gear 214 in the sealing part 21 is fixedly connected to the conveying roller in the conveying device 5, the mating gear 214 is driven to rotate continuously as the conveying device 5 continues to move, which in turn drives the reduction gear 213 to rotate. This causes the frame protrusion 211 and the sealing frame 210 to change their position inside the tin coating tank 20 through the connecting rod 212. When the fixed frame 60 moves to the front of the tin coating tank 20, the bottom surface of the sealing frame 210 contacts the surface of the conveyor belt, and the sealing frame 210 moves upward with the movement of the conveying device 5. When the fixed frame 60 moves to the bottom of the tin coating tank 20, the sealing frame 210 resets and closes the conveying device 5, thus ensuring the sealing of the inside of the fixed tank 201 during the tin coating process.

[0101] In this embodiment, as Figure 8 As shown, the drying section 22 includes several drying chambers 220 disposed inside the fixed chamber 201, a heater 221 disposed on the top wall of the drying chamber 220 near the rear end, and a blower 222 disposed on the horizontal line at the front end of the heater 221.

[0102] Furthermore, the drying chamber 220 is fixedly connected to the inner wall of the frame-shaped groove 2011 by bolts, and the heater 221 and the blower 222 are both fixedly connected to the inner wall of the frame-shaped groove 2011 by screws. The top surface of the drying chamber 220 near the front end has an integrally formed extended chamber body that extends to the outside of the top surface of the fixed chamber 201, and a dust screen 223 is fixedly connected to the top opening of the extended chamber body by screws.

[0103] Furthermore, after the blower 222 in the drying section 22 is started, the internal fan rotates and accelerates the external airflow towards the heater 221. Then the airflow is blown out from the air guide chamber 203 inside the tin coating chamber 20, thereby quickly shaping the tin coated on the surface of the aluminum substrate. Then the airflow returns to the interior of the drying chamber 220 through the suction hood 205, forming a hot air circulation.

[0104] In this embodiment, as Figures 9-10 The tin-coating mold 24 includes a movable mold 240, a mold top slide bar 241 located at the corner of the top surface of the movable mold 240, a limiting plate 242 located on the top surface of the mold top slide bar 241, a tin-coating head 243 located directly above the movable mold 240, and a number of fixed brackets 244 arranged in a matrix on the top surface of the tin-coating head 243. The top surface of the movable mold 240 has a tin-coating tank 2401 that runs vertically through the top and bottom to determine the tin-coating area and thickness of the aluminum substrate.

[0105] Furthermore, the fixing plate at the top of the tin coating machine 23 is fixedly connected to the inner wall of the mounting groove 2010 by bolts. The corners of the movable mold 240 are provided with mating holes 2402 of the same size and corresponding position as the positioning rod 61. The mold top slide rod 241 is welded and fixed to the top surface of the movable mold 240. The limiting plate 242 is integrally formed with the mold top slide rod 241. The mold top slide rod 241 is slidably connected to the inside of the round hole at the end of the fixed bracket 244. The top of the tin coating head 243 is integrally formed with a connecting pipe that connects to the flange at the bottom of the tin injection tube of the tin coating machine 23. The fixed bracket 244 is welded and fixed to the top surface of the tin coating head 243.

[0106] Furthermore, after the telescopic mechanism built into the tinning machine 23 is activated, it drives the tin-filling tube and the tinning mold 24 installed at the tube opening to move downwards. The movable mold 240 continues to move downwards, pressing down on the edge of the aluminum substrate and exposing the area of ​​the aluminum substrate that needs to be tinned to the inside of the tinning tank 2401. The telescopic mechanism continues to move downwards, and after the movable mold 240 is fixed in position, it drives the tinning head 243 to continue moving downwards until the bottom surface of the tinning head 243 is inserted into the inside of the tinning tank 2401. The tinning machine 23 is then activated, transferring the tin from the tube to the surface of the aluminum substrate. The soldering head 243 is directly poured into the inside of the soldering tank 2401, and the solder with the same thickness as the tank wall of the soldering tank 2401 is covered on the surface of the aluminum substrate. After the soldering is completed, the soldering machine 23 is turned off and the built-in telescopic mechanism is started again, which drives the soldering head 243 to move upward until the top surface of the fixed bracket 244 contacts the bottom surface of the limiting plate 242. Then the telescopic mechanism is turned off, so that the mold can still remain on the surface of the aluminum substrate after soldering, which makes it convenient for the subsequent drying unit 22 to quickly set the solder paste on the surface of the aluminum substrate.

[0107] In this embodiment, as Figures 11-14 As shown, the cleaning unit 25 includes a cleaning chamber 250, a blower chamber 251 disposed inside the cleaning chamber 250, a blower fan 253 disposed inside the blower chamber 251, a blower motor 254 disposed on one end of the rotating rod of the blower fan 253, a liquid storage tank 256 disposed above the blower chamber 251, an infusion pipe 257 disposed on the outer wall of the bottom end of the liquid storage tank 256, a spray head 258 disposed at the bottom end of the infusion pipe 257, and a transmission assembly 259 disposed on the other end of the rotating rod of the blower fan 253.

[0108] Specifically, the cleaning chamber 250 is bolted to the outer wall of the fixed chamber 201. The interior of the cleaning chamber 250 has an integrally formed partition plate for providing a placement position for the liquid storage tank 256. The blower chamber 251 is bolted to the inner wall of the cleaning chamber 250. The top chamber of the blower chamber 251 extends to the outer side of the front wall of the cleaning chamber 250, and the bottom chamber of the blower chamber 251 extends to the outer side of the bottom surface of the cleaning chamber 250. The inner side of the opening of the top chamber of the blower chamber 251 is bolted to a filter screen 252 for preventing external debris from entering.

[0109] Furthermore, the left and right ends of the central rotating rod of the blower fan 253 pass through the outer side wall of the blower chamber 251 and are rotatably connected to the inner side wall of the cleaning chamber 250. The blower motor 254 is fixedly connected to the outer side wall of the cleaning chamber 250 by bolts, and the output shaft of the blower motor 254 is coaxially connected to the end of the rotating rod of the blower fan 253.

[0110] Furthermore, the liquid storage tank 256 is placed on the top surface of the internal partition plate of the cleaning chamber 250. A pressure valve 255 for pressurizing the internal liquid is placed on one side of the liquid storage tank 256. The pressure valve 255 is fixedly connected to the top surface of the partition plate by bolts. The two ends of the infusion pipe 257 are respectively connected to the bottom surface of the outer wall of the liquid storage tank 256 and the flange at the center of the top surface of the spray head 258. A tank round valve 2570 is integrally formed on the infusion pipe 257. The spray head 258 is snapped and fixed inside the bottom through groove of the cleaning chamber 250. Several linearly distributed nozzles are threaded on the bottom surface of the spray head 258.

[0111] Furthermore, when the fixed frame 60 moves with the aluminum substrate to below the cleaning section 25 in the tin coating device 2, the blower motor 254 is started to drive the blower fan 253 to rotate, and an airflow is formed at the bottom opening of the blower chamber 251. In conjunction with the transmission component 259, the tank valve 2570 on the infusion tube 257 is continuously opened and closed, and the alcohol in the storage tank 256 is sprayed into the interior of the fixed frame 60 through the spray nozzle 258, and then quickly dried.

[0112] In this embodiment, as Figure 14 As shown, the transmission assembly 259 further includes two meshing transmission gears 2590. One transmission gear 2590 is fixedly connected to the outer wall of the rotating rod of the blower fan 253 near the end by a snap pin. The other transmission gear 2590 is rotatably connected to the inner wall of the cleaning chamber 250. The inside of the other transmission gear 2590 is fixedly connected to a wheel protrusion 2591 by a snap pin. The end of the wheel protrusion 2591 passes through the inner wall of the tank valve 2570 and is coaxially connected to the rotating cylinder 2592. The rotating cylinder 2592 is rotatably connected to the inside of the tank valve 2570. Two symmetrically arranged and interconnected cylinder grooves are provided on the inner wall of the rotating cylinder 2592.

[0113] Furthermore, as the blower motor 254 drives the blower fan 253 to rotate, it drives the transmission gear 2590, which is fixed to one end of the rotating rod of the blower fan 253, to rotate. This drives another transmission gear 2590 to rotate, which in turn drives the rotating drum 2592 to rotate continuously inside the tank valve 2570 via the wheel body protrusion 2591. When the cylinder through groove on the rotating drum 2592 is misaligned with the transport direction of the infusion pipe 257, the spraying of alcohol from the spray head 258 stops.

[0114] 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 preferred examples and are not intended to limit 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 present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A tin-coating process in LED bulb assembly, characterized in that: Includes the following steps: I. Aluminum substrate placement stage S1. Start the conveyor device (5), drive the conveyor belt to move through the conveyor motor, and transport several placement frames (6) sequentially and regularly from the outlet of the feeding device toward the aluminum substrate placement device (1). S2. When the placement frame (6) moves to the bottom of the aluminum substrate placement device (1), turn off the conveying device (5) and start the aluminum substrate placement device (1), place the aluminum substrate that needs to be tinned into the bottom of the fixed frame (60), and then start the conveying device (5) again. II. Cleaning Phase S3. When the fixed frame (60) moves with the aluminum substrate to the bottom of the cleaning section (25) in the tin coating device (2), the blower motor (254) is started to drive the blower fan (253) to rotate, and an airflow is formed at the bottom opening of the blower chamber (251). In conjunction with the transmission component (259), the tank round valve (2570) on the infusion tube (257) is continuously opened and closed, and the alcohol in the storage tank (256) is sprayed into the inside of the fixed frame (60) through the spray head (258), and then quickly dried. III. Sealing Stage S4. As the conveying device (5) continues to move, the mating gear (214) that is fixedly connected to the sealing part (21) and the conveying roller in the tin coating device (2) rotates continuously, which drives the reduction gear (213) to rotate, and then drives the frame protrusion (211) and the sealing frame (210) to change their position inside the tin coating tank (20) through the connecting rod (212). S6. When the fixed frame (60) moves to the front of the tin coating tank (20), the bottom surface of the sealing frame (210) contacts the surface of the conveyor belt, and with the movement of the conveying device (5), the sealing frame (210) moves upward. When the fixed frame (60) moves to the bottom of the tin coating tank (20), the sealing frame (210) resets and the conveying device (5) is closed. IV. Tin Coating Stage S7. The telescopic mechanism built into the tinning machine (23) drives the tin-filling tube and the tin-filling mold (24) installed at the tube opening to move down. The movable mold (240) continues to move down and presses down on the edge of the aluminum substrate, exposing the part of the aluminum substrate that needs to be tinned to the inside of the tin-filling tank (2401). S8. Continue to control the telescopic mechanism to move down. After the position of the movable mold (240) is fixed, it will drive the tin-coating head (243) to continue to move down until the bottom surface of the tin-coating head (243) is inserted into the inside of the tin-coating tank (2401). Start the tin-coating machine (23) to pour the tin directly into the inside of the tin-coating tank (2401) from the tin-coating head (243) and cover the surface of the aluminum substrate with the same thickness as the tank wall of the tin-coating tank (2401). S9. After the tin coating is completed, turn off the tin coating machine (23) and start the built-in telescopic mechanism again to move the tin coating head (243) up until the top surface of the fixed bracket (244) contacts the bottom surface of the limit plate (242), and then turn off the telescopic mechanism. V. Drying Stage S10. Start the blower (222) in the drying section (22), and blow the airflow through the heater (221) and out through the air guide chamber (203) inside the tin coating chamber (20), thereby quickly shaping the tin coated on the surface of the aluminum substrate. Then the airflow returns to the interior of the drying chamber (220) through the suction hood (205) to form a hot air circulation. VI. LED installation stage S11. After the tin coating on the aluminum substrate has set, start the conveying device (5) and move the aluminum substrate after tin coating to the bottom of the LED bead installation machine (3). Then start the LED bead installation machine (3) and install LED beads at the designated position. VII. Light Bulb Installation Stage S12. After the LED beads are installed, start the conveying device (5) again to move the aluminum substrate to the bottom of the bulb mounting machine (4). Start the bulb mounting machine (4) to complete the installation of the bulb outside the LED beads. Then, manually take the assembled aluminum substrate and the placement frame (6) from the conveying device (5) and send it into the subsequent lamp board assembly equipment. The external part of the above-mentioned conveying device (5) is provided with an aluminum substrate placement device (1), a tin coating device (2), a lamp bead installation machine (3) and a bulb installation machine (4) from front to back. The top surface of the conveyor belt of the conveying device (5) carries a number of linearly distributed placement frames (6) for placing aluminum substrates. The tin coating device (2) includes a tin coating tank (20), a sealing part (21) disposed outside the tin coating tank (20) wall, a drying part (22) disposed inside the tin coating tank (20) wall, a tin coating machine (23) disposed at the center of the tin coating tank (20), a tin coating mold (24) disposed at the end of the tin injection tube of the tin coating machine (23), and a cleaning part (25) disposed on the outer side wall of the front end of the tin coating tank (20); The tin coating tank (20) includes a fixed tank body (201) with an open bottom, support columns (202) located at the corners of the outer walls at both ends of the fixed tank body (201), a guide tank body (203) located on the rear end wall of the fixed tank body (201) near the open bottom, several regularly distributed guide plates (204) located on the guide tank body (203), and a suction hood (205) located on the front end wall of the fixed tank body (201) near the open bottom. The sealing part (21) includes a sealing frame (210) for ensuring the airtightness of the tin coating process, frame protrusions (211) located on the outer side walls of the left and right ends of the sealing frame (210) near the middle position, a connecting rod (212) located at the center position of the outer side wall of the frame protrusion (211), a reduction gear (213) located on the bottom end of the connecting rod (212), and a mating gear (214) meshing with the reduction gear (213); The drying section (22) includes several drying chambers (220) disposed inside the fixed chamber (201), a heater (221) disposed on the top wall of the drying chamber (220) near the rear end, and a blower (222) disposed on the horizontal line at the front end of the heater (221). The tin-coating mold (24) includes a movable mold (240), a mold top slide bar (241) located at the corner of the top surface of the movable mold (240), a limiting plate (242) located on the top surface of the mold top slide bar (241), a tin-coating head (243) located directly above the movable mold (240), and a number of fixed brackets (244) arranged in a matrix on the top surface of the tin-coating head (243). The top surface of the movable mold (240) is provided with a tin-coating groove (2401) that runs vertically through the top and bottom to determine the tin-coating area and thickness of the aluminum substrate. The cleaning unit (25) includes a cleaning chamber (250), a blower chamber (251) disposed inside the cleaning chamber (250), a blower fan (253) disposed inside the blower chamber (251), a blower motor (254) disposed on one end of the rotating rod of the blower fan (253), a liquid storage tank (256) disposed above the blower chamber (251), an infusion pipe (257) disposed on the outer wall of the bottom end of the liquid storage tank (256), a spray head (258) disposed at the bottom end of the infusion pipe (257), and a transmission assembly (259) disposed on the other end of the rotating rod of the blower fan (253). The placement frame (6) includes a fixed frame (60) with an open top and a positioning rod (61) integrally formed at the bottom corner of the fixed frame (60) to determine the position of the movable mold (240) after it moves down.

2. The tin-coating process in LED bulb assembly according to claim 1, characterized in that: The top surface of the fixed chamber (201) is provided with an installation groove (2010) that runs vertically through the chamber to provide a fixed area for the tin coating machine (23). The interior of the fixed chamber (201) has a frame-shaped groove (2011) with an inverted U-shaped longitudinal cross section. The bottom surface of the fixed chamber (201) is provided with a sliding groove (2012) that provides a moving range for the sealing frame (210). The bottom of the groove walls at both ends of the frame-shaped groove (2011) is provided with through holes that communicate with the interior of the fixed chamber (201).

3. The tin-coating process in LED bulb assembly according to claim 2, characterized in that: The support column (202) is fixedly connected to the outer wall of the fixed chamber (201) by bolts. The air guide chamber (203) is fixedly connected to the outer side of the through hole communicating with the frame groove (2011) on the inner wall of the fixed chamber (201) by screws. The air guide plate (204) is integrally formed with the air guide chamber (203). The air suction hood (205) is fixedly connected to the outer side of the through hole communicating with the frame groove (2011) on the inner wall of the fixed chamber (201) by screws.

4. The tin-coating process in LED bulb assembly according to claim 2, characterized in that: The sealing frame (210) is slidably connected to the inside of the groove (2012). The frame protrusion (211) is integrally formed with the sealing frame (210). The two ends of the connecting rod (212) are respectively rotatably connected to the outer side wall of the frame protrusion (211) and the outer side wall of the reduction gear (213) through bearings. The reduction gear (213) is rotatably connected to the outer side wall of the conveying bracket of the conveying device (5). The center of the docking gear (214) is integrally formed with a wheel convex shaft that is coaxially connected with the conveying roller inside the conveying device (5).

5. The tin-coating process in LED bulb assembly according to claim 2, characterized in that: The drying chamber (220) is fixedly connected to the inner wall of the frame-shaped groove (2011) by bolts. The heater (221) and the blower (222) are both fixedly connected to the inner wall of the frame-shaped groove (2011) by screws. An extended chamber body extending to the outside of the top surface of the fixed chamber (201) is integrally formed on the top surface of the drying chamber (220) near the front end. A dustproof net (223) is fixedly connected to the top opening of the extended chamber body by screws.

6. The tin-coating process in LED bulb assembly according to claim 2, characterized in that: The fixing plate at the top of the tin coating machine (23) is fixedly connected to the inner wall of the mounting groove (2010) by bolts. The corners of the movable mold (240) are provided with mating holes (2402) of the same size and corresponding position as the positioning rod (61). The mold top slide rod (241) is welded and fixed to the top surface of the movable mold (240). The limiting plate (242) and the mold top slide rod (241) are integrally formed. The mold top slide rod (241) is slidably connected to the inside of the round hole at the end of the fixed bracket (244). The top of the tin coating head (243) is integrally formed with a connecting pipe that is connected to the bottom flange of the tin injection tube of the tin coating machine (23). The fixed bracket (244) is welded and fixed to the top surface of the tin coating head (243).

7. The tin-coating process in LED bulb assembly according to claim 1, characterized in that: The cleaning chamber (250) is bolted to the outer wall of the fixed chamber (201). The interior of the cleaning chamber (250) is integrally formed with a partition plate for providing a placement position for the liquid storage tank (256). The blower chamber (251) is bolted to the inner wall of the cleaning chamber (250). The top chamber of the blower chamber (251) extends to the outer side of the front wall of the cleaning chamber (250), and the bottom chamber of the blower chamber (251) extends to the outer side of the bottom surface of the cleaning chamber (250). The inner side of the opening of the top chamber of the blower chamber (251) is bolted with a filter screen (252) for preventing external debris from entering.

8. The tin-coating process in LED bulb assembly according to claim 1, characterized in that: The left and right ends of the central rotating rod of the blower (253) pass through the outer side wall of the blower chamber (251) and are rotatably connected to the inner side wall of the cleaning chamber (250). The blower motor (254) is fixedly connected to the outer side wall of the cleaning chamber (250) by bolts. The output shaft of the blower motor (254) is coaxially connected to the end of the rotating rod of the blower (253).

9. The tin-coating process in LED bulb assembly according to claim 1, characterized in that: The liquid storage tank (256) is placed on the top surface of the partition plate inside the cleaning chamber (250). A pressure valve (255) for pressurizing the internal liquid is placed on one side of the liquid storage tank (256). The pressure valve (255) is fixedly connected to the top surface of the partition plate by bolts. The two ends of the infusion pipe (257) are respectively connected to the bottom surface of the outer wall of the liquid storage tank (256) and the center of the top surface of the spray head (258) by flanges. A tank round valve (2570) is integrally formed on the infusion pipe (257). The spray head (258) is snapped and fixed inside the bottom through groove of the cleaning chamber (250). Several nozzles are linearly distributed and threaded on the bottom surface of the spray head (258).

10. The tin-coating process in LED bulb assembly according to claim 1, characterized in that: The transmission assembly (259) includes two meshing transmission gears (2590). One of the transmission gears (2590) is fixedly connected to the outer wall of the rotating rod of the blower fan (253) near the end by a snap pin. The other transmission gear (2590) is rotatably connected to the inner wall of the cleaning chamber (250). The inside of the other transmission gear (2590) is fixedly connected to a wheel protrusion (2591) by a snap pin. The end of the wheel protrusion (2591) passes through the inner wall of the tank valve (2570) and is coaxially connected to a rotating cylinder (2592). The rotating cylinder (2592) is rotatably connected to the inside of the tank valve (2570). Two symmetrically arranged and interconnected cylinder grooves are provided on the inner wall of the rotating cylinder (2592).

Images