Baking device for PCB processing

Abstract

The invention belongs to the technical field of PCB (printed circuit board) processing, and discloses a baking device for PCB processing, which comprises a baking box and a plurality of connecting plates, a first roller conveyor and a second roller conveyor are fixedly mounted in the baking box, two support frames are slidably connected in the baking box, a third roller conveyor is fixedly mounted in each support frame, and a plurality of third roller conveyors are fixedly mounted in the third roller conveyors. The two supporting frames are fixedly connected through a plurality of connecting plates, and a lifting mechanism used for driving the supporting frames to move up and down intermittently is arranged in the baking box. According to the PCB baking device, the two supporting frames are fixedly connected through the connecting plate, can synchronously ascend and descend and are alternately located at the feeding position and the discharging position, when PCBs on one supporting frame are baked, the other supporting frame is exactly located at the position flush with the first roller conveyor and the second roller conveyor, feeding of the next batch of PCBs or discharging of the previous batch of PCBs can be synchronously conducted, and the PCB baking efficiency is improved. Intermittent time of traditional single-channel baking, waiting and feeding is eliminated, continuous baking process is achieved, and baking efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of PCB board processing, and more specifically, to a baking apparatus for PCB board processing. Background Technology

[0002] In the PCB manufacturing industry, the baking process is mainly used for removing flux residues after PCB soldering, curing solder resist, and moisture protection of components. Its efficiency and baking consistency directly affect the production cycle and quality stability of PCBs.

[0003] Currently, the mass production of PCB boards mostly uses rack tunnel ovens for baking. This involves conveying PCB boards into the tunnel oven via a conveyor, using sealed gates to create independent baking spaces, and then introducing high-temperature drying gas to complete the process.

[0004] However, existing rack tunnel ovens use a single-channel sealed baking design. When the PCB board is transported to the designated area inside the tunnel oven, the front and rear sealing gates descend, and the subsequent PCB boards need to be paused for transport. After the boards are baked, the gates rise, and the baked PCB boards are output before the next batch can enter. This intermittent baking process results in low drying efficiency. In view of this, we propose a baking device for PCB board processing. Summary of the Invention

[0005] This application aims to solve at least one of the technical problems existing in the prior art. To this end, this application proposes a baking device for PCB board processing, which consists of two trays fixedly connected by a connecting plate. These trays can be raised and lowered synchronously and alternately positioned at the feeding and discharging positions. When a PCB board on one tray is being baked, the other tray is positioned flush with the first and second roller conveyors, allowing for the simultaneous feeding of the next batch of PCB boards or the discharging of the previous batch. This eliminates the intermittent time of traditional single-channel baking, waiting, and feeding, achieving a continuous baking process and improving baking efficiency.

[0006] This invention proposes the following technical solution: a baking device for PCB board processing, comprising a baking oven and multiple connecting plates. A first roller conveyor and a second roller conveyor are fixedly installed inside the baking oven. Two support frames are slidably connected inside the baking oven, and a third roller conveyor is fixedly installed inside each support frame. The two support frames are fixedly connected by multiple connecting plates. A lifting mechanism for driving the support frames to move up and down intermittently is provided inside the baking oven. Two first sealing plates and two second sealing plates are fixedly connected inside the baking oven. When the upper support frame moves upward, its two ends slide into contact with the first sealing plates respectively. At this time, the third roller conveyor in the lower support frame is at the same horizontal height as the first roller conveyor and the second roller conveyor. When the lower support frame moves downward, its two ends slide into contact with the two second sealing plates respectively. At this time, the third roller conveyor in the upper support frame is at the same horizontal height as the first roller conveyor and the second roller conveyor.

[0007] Preferably, the lifting mechanism includes an output rod and two guide rods. The tops of the guide rods and the output rod are fixedly connected to the bottom of the support frame located below, and the bottoms of the guide rods and the output rods pass through the baking oven and are slidably connected thereto.

[0008] Preferably, a support frame is fixedly connected to the bottom of the baking oven, and the lifting mechanism further includes a mounting frame and a cylinder. The cylinder is fixedly connected to the bottom of the mounting frame, and the output end of the cylinder is fixedly connected to the output rod.

[0009] Preferably, multiple cooling fans are fixedly installed on both sides of the baking oven, and the cooling fans are located on both sides of the second roller conveyor.

[0010] Preferably, an exhaust pipe is fixedly connected to the outer wall of the first sealing plate and the second sealing plate on one side, and the end of the exhaust pipe passes through the baking oven and extends to its outer side. A first air inlet pipe is fixedly connected to the outer wall of the first sealing plate on the other side, and a second air inlet pipe is fixedly connected to the outer wall of the second sealing plate on the other side. The ends of the first air inlet pipe and the second air inlet pipe pass through the baking oven and extend to its outer side.

[0011] Preferably, the bottom of the baking oven is fixedly connected to an installation cylinder, the bottom of the installation cylinder is fixedly connected to an installation frame, a sliding sleeve is slidably connected to the inner wall of the installation cylinder, and two branch air inlet connectors are fixedly connected to the outer wall of the installation cylinder. The end of the upper branch air inlet connector is fixedly connected to the second branch air inlet pipe, and the end of the lower branch air inlet connector is fixedly connected to the first branch air inlet pipe.

[0012] Preferably, the mounting cylinder has a movable cavity, the branch air inlet connector is connected to the movable cavity, the inner wall of the movable cavity is slidably connected to a sliding sleeve, the movable cavity is provided with two telescopic hoses, both ends of the two telescopic hoses are fixedly connected to connectors, the two connectors on one side are fixedly connected to the branch air inlet connector, and the two connectors on the other side are fixedly connected to the sliding sleeve, the outer wall of the mounting cylinder is fixedly connected to a main air inlet pipe, and the main air inlet pipe is connected to the movable cavity.

[0013] Preferably, a limiting sleeve is fixedly connected to the outer wall of the output rod, a return spring is sleeved on the outer wall of the output rod, a sliding plate is fixedly connected to the outer wall of the sliding sleeve, the end of the sliding plate extends to the outside of the mounting cylinder, the sliding plate is slidably connected to the mounting cylinder, the sliding plate can slide up and down along the mounting cylinder, the end of the output rod passes through the sliding plate and is slidably connected to it, and the limiting sleeve is located below the sliding plate.

[0014] Preferably, one end of the return spring is fixedly connected to the slide plate, and the other end of the return spring is fixedly connected to the bottom of the baking oven.

[0015] Preferably, when the upper support frame moves upward, the output rod drives the limiting sleeve to press the slide plate upward, and the slide plate drives the sliding sleeve to move upward. At this time, the inner end of the main intake pipe is connected to the lower connector on the sliding sleeve. When the lower support frame moves downward, the return spring presses the slide plate downward, and the slide plate drives the sliding sleeve to move downward. At this time, the inner end of the main intake pipe is connected to the upper connector on the sliding sleeve.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In this invention, two trays are fixedly connected by a connecting plate and can be raised and lowered synchronously and alternately positioned at the feeding and discharging positions. When the PCB board on one tray is being baked, the other tray is exactly at the same level as the first roller conveyor and the second roller conveyor, so that the next batch of PCB boards can be fed or the previous batch can be discharged synchronously. This eliminates the intermittent time of traditional single-channel baking, waiting and feeding, realizes continuous baking process and improves baking efficiency.

[0017] 2. In this invention, the output rod drives the sliding sleeve to move synchronously through the limiting sleeve and the sliding plate, realizing the linkage control of airflow channel switching. No additional driving components are required. The lifting action of the support frame can automatically trigger the hot airflow to be delivered to the current baking area, simplifying the operation process and avoiding baking delays caused by manual airflow switching.

[0018] 3. In this invention, the connectors at one end of the two telescopic hoses are fixed to the air inlet connector, which can improve the sealing of the connection. The connectors at the other end can move up and down alternately with the sliding sleeve to realize the switching of airflow channels. The telescopic hoses can be compressed and stretched as the connectors move. Compared with the overall movement of the telescopic hoses and the two connectors, the space required for component movement can be reduced, thus reducing space occupation. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the present invention; Figure 3 This is a schematic diagram of the installation structure of the support frame of the present invention; Figure 4 This is a schematic diagram of the mounting structure of the mounting cylinder of the present invention; Figure 5 This is a schematic diagram of the mounting structure of the sliding sleeve of the present invention; Figure 6 This is a schematic diagram of the installation structure of the telescopic hose of the present invention.

[0021] The following are the labels in the diagram: 1. Support frame; 2. Baking oven; 3. Cooling fan; 4. First roller conveyor; 5. Second roller conveyor; 6. First sealing plate; 7. Second sealing plate; 8. Support frame; 9. Connecting plate; 10. Third roller conveyor; 11. Guide rod; 12. Output rod; 13. Exhaust pipe; 14. First branch air inlet pipe; 15. Second branch air inlet pipe; 16. Mounting bracket; 17. Cylinder; 18. Return spring; 19. Slide plate; 20. Limit sleeve; 21. Mounting cylinder; 22. Movable cavity; 23. Main air inlet pipe; 24. Branch air inlet connector; 25. Sliding sleeve; 26. Telescopic hose; 27. Connector. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, not all of them. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0023] like Figures 1-3 As shown, a baking device for PCB board processing includes a baking oven 2 and multiple connecting plates 9. A first roller conveyor 4 and a second roller conveyor 5 are fixedly installed inside the baking oven 2. Two support frames 8 are slidably connected inside the baking oven 2, and a third roller conveyor 10 is fixedly installed inside each support frame 8. The two support frames 8 are fixedly connected by multiple connecting plates 9. The baking oven 2 is provided with a lifting mechanism for driving the support frames 8 to move up and down intermittently. Two first sealing plates 6 and two second sealing plates 7 are fixedly connected inside the baking oven 2. When the upper support frame 8 moves upward, its two ends slide into contact with the first sealing plates 6 respectively. At this time, the third roller conveyor 10 in the lower support frame 8 is at the same horizontal height as the first roller conveyor 4 and the second roller conveyor 5. When the lower support frame 8 moves downward, its two ends slide into contact with the two second sealing plates 7 respectively. At this time, the third roller conveyor 10 in the upper support frame 8 is at the same horizontal height as the first roller conveyor 4 and the second roller conveyor 5.

[0024] By alternating the operation of the two trays 8, the second batch of PCBs can be loaded during the baking process of the first batch of PCBs, which can improve the efficiency of operation.

[0025] When the two support frames 8 form a sealing space with the first sealing plate 6 and the second sealing plate 7 respectively, the sealing performance of the structure can be improved. However, in the existing tube oven baking device, the gate in the tube oven has gaps between the conveying rollers during the sealing process, which makes it impossible to seal effectively and results in poor sealing performance.

[0026] like Figure 2 and Figure 3 As shown, the lifting mechanism includes an output rod 12 and two guide rods 11. The tops of the guide rods 11 and the output rods 12 are fixedly connected to the bottom of the support frame 8 located below. The bottoms of the guide rods 11 and the output rods 12 pass through the baking oven 2 and are slidably connected to it. The bottom of the baking oven 2 is fixedly connected to a support frame 1. The lifting mechanism also includes a mounting frame 16 and a cylinder 17. The cylinder 17 is fixedly connected to the bottom of the mounting frame 16, and the output end of the cylinder 17 is fixedly connected to the output rod 12.

[0027] like Figure 1 As shown, multiple cooling fans 3 are fixedly installed on both sides of the baking oven 2, and the cooling fans 3 are located on both sides of the second roller conveyor 5.

[0028] like Figures 3-6 As shown, exhaust pipes 13 are fixedly connected to the outer walls of the first sealing plate 6 and the second sealing plate 7 on one side. The ends of the exhaust pipes 13 pass through the baking oven 2 and extend to its outer side. The first sealing plate 6 on the other side is fixedly connected to the outer wall of the first sealing plate 6, and the second sealing plate 7 on the other side is fixedly connected to the outer wall of the second sealing plate 7. The ends of the first air inlet pipe 14 and the second air inlet pipe 15 pass through the baking oven 2 and extend to its outer side. The bottom of the baking oven 2 is fixedly connected to the mounting cylinder 21. The bottom of the mounting cylinder 21 is fixedly connected to the mounting frame 16. The inner wall of the mounting cylinder 21 is slidably connected to the sliding sleeve 25. The outer wall of the mounting cylinder 21 is fixedly connected to two branch air inlet connectors 24. The end of the upper branch air inlet connector 24 is fixedly connected to the second branch air inlet pipe 15, and the end of the lower branch air inlet connector 24 is fixedly connected to the first branch air inlet pipe 14. The mounting cylinder 21 has a movable cavity 22. The branch air inlet connector 24 is connected to the movable cavity 22. The inner wall of the movable cavity 22 is slidably connected to the sliding sleeve 25. The movable cavity 22 is provided with two telescopic hoses 26. Both ends of the two telescopic hoses 26 are fixedly connected to connectors 27. The two connectors 27 on one side are fixedly connected to the branch air inlet connector 24. The two connectors 27 on the other side are fixedly connected to the sliding sleeve 25. The outer wall of the mounting cylinder 21 is fixedly connected to the main air inlet pipe 23, which is connected to the movable cavity 22. A limiting sleeve 20 is fixedly connected to the outer wall of the output rod 12. A return spring 18 is sleeved on the outer wall of the output rod 12. A sliding plate 19 is fixedly connected to the outer wall of the sliding sleeve 25. One end of the return spring 18 is fixedly connected to the sliding plate 19. The other end of the return spring 18 is fixedly connected to the bottom of the baking oven 2. The end of the sliding plate 19 extends to the outside of the mounting cylinder 21. The sliding plate 19 is slidably connected to the mounting cylinder 21. The sliding plate 19 can slide up and down along the mounting cylinder 21. The end of the output rod 12 passes through the sliding plate 19 and is slidably connected to it. The limiting sleeve 20 is located below the sliding plate 19. When the upper support frame 8 moves upward, the output rod 12 drives the limiting sleeve 20 to press the slide plate 19 upward. The slide plate 19 drives the sliding sleeve 25 to move upward. At this time, the inner end of the main air intake pipe 23 is connected to the lower connector 27 on the sliding sleeve 25. When the lower support frame 8 moves downward, the return spring 18 presses the slide plate 19 downward. The slide plate 19 drives the sliding sleeve 25 to move downward. At this time, the inner end of the main air intake pipe 23 is connected to the upper connector 27 on the sliding sleeve 25.

[0029] The output rod 12 drives the sliding sleeve 25 to move synchronously through the limiting sleeve 20 and the sliding plate 19, realizing the linkage control of airflow channel switching. No additional driving components are required. The lifting action of the support frame 8 can automatically trigger the hot airflow to be delivered to the current baking area, simplifying the operation process and avoiding baking delays caused by manual airflow switching.

[0030] The connector 27 at one end of the two telescopic hoses 26 is fixed to the air inlet connector 24, which can improve the sealing of the connection. The connector 27 at the other end can move up and down alternately with the sliding sleeve 25 to realize the switching of airflow channels. The telescopic hose 26 can be compressed and stretched with the movement of the connector 27. Compared with the overall movement of the telescopic hose 26 and the two connectors 27, the space required for component movement can be reduced, thus reducing space occupation.

[0031] Initially, the third roller conveyor 10 inside the upper support frame 8 is at the same horizontal height as the first roller conveyor 4 and the second roller conveyor 5. The first batch of PCB boards is conveyed to the third roller conveyor 10 of the upper support frame 8 via the first roller conveyor 4. After feeding is completed, the cylinder 17 of the lifting mechanism is activated, and its output end pushes the output rod 12 to move upward, causing the lower support frame 8 and the upper support frame 8 to rise synchronously. During the rising process, the lower support frame 8 gradually detaches from the second sealing plate 7, and the two ends of the upper support frame 8 gradually slide into contact with the first sealing plate 6 to form a seal. When it rises to the preset position, the third roller conveyor 10 of the lower support frame 8 is level with the first roller conveyor 4 and the second roller conveyor 5. At this time, the second batch of PCB boards is transported to the third roller conveyor 10 of the lower support frame 8 via the first roller conveyor 4. When the output end of cylinder 17 pushes the output rod 12 to move upward, it squeezes the slide plate 19 upward through the limit sleeve 20. The slide plate 19 drives the sliding sleeve 25 to slide upward along the inner wall of the mounting cylinder 21. At this time, the main air intake pipe 23 is connected to the lower telescopic hose 26. The connector 27 at one end of the telescopic hose 26 is connected to the main air intake pipe 23, and the connector 27 at the other end of the telescopic hose 26 is connected to the lower branch air intake connector 24. The external baking gas enters between the two first sealing plates 6 through the lower branch air intake connector 24 and the first branch air intake pipe 14 to bake the PCB board. The external fan delivers air from the first branch air intake pipe 14 to the outside through the exhaust pipe 13. After the PCB board is baked, cylinder 17 starts in reverse, and output rod 12 drives the two support frames 8 to descend synchronously. During the descent, the upper support frame 8 gradually separates from the first sealing plate 6, and the two ends of the lower support frame 8 gradually slide into contact with the second sealing plate 7 to form a seal. When it descends to the preset position, the third roller conveyor 10 of the upper support frame 8 is once again level with the first roller conveyor 4 and the second roller conveyor 5.

[0032] After baking, the first batch of PCB boards is output via the third roller conveyor 10 and the second roller conveyor 5. Under the elastic force of the return spring 18, the slide plate 19 drives the sliding sleeve 25 to move downward. At this time, the main air inlet pipe 23 is connected to the upper telescopic hose 26. The connector 27 at one end of the telescopic hose 26 is connected to the main air inlet pipe 23, and the connector 27 at the other end of the telescopic hose 26 is connected to the upper branch air inlet connector 24. The external baking gas enters between the two second sealing plates 7 through the lower branch air inlet connector 24 and the second branch air inlet pipe 15 to bake the second batch of PCB boards. The third batch of PCB boards can be simultaneously conveyed to the upper support frame 8 to achieve continuous circulation.

[0033] During the baking process, the exhaust pipe 13 discharges the hot and humid exhaust gas from the sealed area to ensure a stable baking environment, and the cooling fan 3 dissipates heat to both sides of the second roller conveyor 5 at the output end.

[0034] 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 baking apparatus for PCB board processing, comprising a baking oven (2) and multiple connecting plates (9), characterized in that: The baking oven (2) is equipped with a first roller conveyor (4) and a second roller conveyor (5). Two support frames (8) are slidably connected inside the baking oven (2). A third roller conveyor (10) is installed inside each support frame (8). The two support frames (8) are fixed by multiple connecting plates (9). The baking oven (2) is provided with a lifting mechanism for driving the support frames (8) to move up and down intermittently. Two first sealing plates (6) and two second sealing plates (7) are fixedly connected inside the baking oven (2). When the upper support frame (8) moves upward, its two ends slide into contact with the first sealing plate (6) respectively. At this time, the third roller conveyor (10) in the lower support frame (8) is at the same horizontal height as the first roller conveyor (4) and the second roller conveyor (5). When the lower support frame (8) moves downward, its two ends slide into contact with the two second sealing plates (7) respectively. At this time, the third roller conveyor (10) in the upper support frame (8) is at the same horizontal height as the first roller conveyor (4) and the second roller conveyor (5).

2. The baking apparatus for PCB board processing according to claim 1, characterized in that: The lifting mechanism includes an output rod (12) and two guide rods (11). The tops of the guide rods (11) and the output rods (12) are fixedly connected to the bottom of the support frame (8) located below. The bottoms of the guide rods (11) and the output rods (12) pass through the baking oven (2) and are slidably connected to it.

3. The baking apparatus for PCB board processing according to claim 2, characterized in that: The oven (2) is fixedly connected to a support frame (1) at the bottom. The lifting mechanism also includes a mounting frame (16) and a cylinder (17). The cylinder (17) is fixedly connected to the bottom of the mounting frame (16), and the output end of the cylinder (17) is fixedly connected to the output rod (12).

4. The baking apparatus for PCB board processing according to claim 3, characterized in that: Multiple cooling fans (3) are fixedly installed on both sides of the baking oven (2), and the cooling fans (3) are located on both sides of the second roller conveyor (5).

5. The baking apparatus for PCB board processing according to claim 4, characterized in that: On one side, the outer walls of the first sealing plate (6) and the second sealing plate (7) are fixedly connected to exhaust pipes (13), the ends of which pass through the baking oven (2) and extend to its outer side. On the other side, the outer wall of the first sealing plate (6) is fixedly connected to a first air inlet pipe (14), and the outer wall of the second sealing plate (7) is fixedly connected to a second air inlet pipe (15). The ends of the first air inlet pipe (14) and the second air inlet pipe (15) pass through the baking oven (2) and extend to its outer side.

6. The baking apparatus for PCB board processing according to claim 5, characterized in that: The bottom of the baking oven (2) is fixedly connected to an installation cylinder (21), the bottom of the installation cylinder (21) is fixedly connected to the installation frame (16), the inner wall of the installation cylinder (21) is slidably connected to a sliding sleeve (25), and the outer wall of the installation cylinder (21) is fixedly connected to two branch air inlet connectors (24). The end of the upper branch air inlet connector (24) is fixedly connected to the second branch air inlet pipe (15), and the end of the lower branch air inlet connector (24) is fixedly connected to the first branch air inlet pipe (14).

7. The baking apparatus for PCB board processing according to claim 6, characterized in that: The mounting cylinder (21) has a movable cavity (22) inside. The branch air inlet connector (24) is connected to the movable cavity (22). The inner wall of the movable cavity (22) is slidably connected to a sliding sleeve (25). The movable cavity (22) is provided with two telescopic hoses (26). Both ends of the two telescopic hoses (26) are fixedly connected to connectors (27). The two connectors (27) on one side are fixedly connected to the branch air inlet connector (24), and the two connectors (27) on the other side are fixedly connected to the sliding sleeve (25). The outer wall of the mounting cylinder (21) is fixedly connected to a main air inlet pipe (23), and the main air inlet pipe (23) is connected to the movable cavity (22).

8. The baking apparatus for PCB board processing according to claim 7, characterized in that: The output rod (12) is fixedly connected to the outer wall of the limiting sleeve (20), and the outer wall of the output rod (12) is fitted with a return spring (18). The outer wall of the sliding sleeve (25) is fixedly connected to the sliding plate (19). The end of the sliding plate (19) extends to the outside of the mounting cylinder (21). The sliding plate (19) is slidably connected to the mounting cylinder (21). The sliding plate (19) can slide up and down along the mounting cylinder (21). The end of the output rod (12) passes through the sliding plate (19) and is slidably connected to it. The limiting sleeve (20) is located below the sliding plate (19).

9. The baking apparatus for PCB board processing according to claim 8, characterized in that: One end of the reset spring (18) is fixedly connected to the slide plate (19), and the other end of the reset spring (18) is fixedly connected to the bottom of the baking oven (2).

10. The baking apparatus for PCB board processing according to claim 9, characterized in that: When the upper support frame (8) moves upward, the output rod (12) drives the limiting sleeve (20) to press the slide plate (19) upward, and the slide plate (19) drives the sliding sleeve (25) to move upward. At this time, the inner end of the main air intake pipe (23) is connected to the lower connector (27) on the sliding sleeve (25). When the lower support frame (8) moves downward, the return spring (18) presses the slide plate (19) downward, and the slide plate (19) drives the sliding sleeve (25) to move downward. At this time, the inner end of the main air intake pipe (23) is connected to the upper connector (27) on the sliding sleeve (25).

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