PCB (printed circuit board) curing oven

Abstract

The utility model provides a PCB (printed circuit board) curing oven, which relates to the technical field of PCB production and comprises a fan motor. A fan disc is installed on a motor shaft of the fan motor, a fan frame plate is rotationally connected to the outer side face of the fan disc, an air inlet barrel is welded to the outer side face of the fan frame plate, and an air duct shell is welded to the front end of the air inlet barrel; a driving gear is mounted on a motor shaft of the transfer motor, and the outer side face of the driving gear is connected with a driven gear in a meshed mode; sliding frames are welded to the left end and the right end of the guide rod, a clamping plate is slidably connected to the outer side face of the guide rod, and a two-way threaded rod is connected into a threaded through hole of the clamping plate in a meshed mode; through the arrangement of the clamping plate, the bidirectional threaded rod, the air duct shell and the fan disc, one-time synchronous drying of the upper surface coating and the lower surface coating of the PCB is achieved, and the drying efficiency is improved; the problems of low coating curing efficiency and high drying cost caused by the fact that the upper side face and the lower side face of the PCB cannot be synchronously dried by wind and heat in a drying and curing mode of a traditional oven on the PCB are solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the PCB board production technical field, more specifically, it is especially related to a kind of PCB board solidification oven. BACKGROUND

[0002] ‌PCB board solidification is a kind of tin paste or other coating on PCB board is treated by specific process, so that it is solidified into shape, to protect the component on PCB board and enhance its durability and waterproof performance. Currently, PCB board solidification usually adopts closed oven to place the coating on the surface of PCB board placed on oven tray by air heating drying, since PCB board is horizontally placed on the upper side of oven tray, the lower side of PCB board will be in contact with oven tray, however, the upper side surface and lower side surface of PCB need to be daubed tin paste coating for drying solidification, therefore, after oven completes coating solidification on the upper side of PCB, it is needed to take out PCB from oven and manually turn over, to carry out air heating solidification of lower side coating of PCB, it can be seen that the upper side and lower side of PCB cannot be dried and solidified into shape at one time in oven, not only prolongs solidification time, but also increases the electric energy use cost of oven for drying and solidifying PCB. SUMMARY

[0003] In order to solve the above technical problems, the utility model provides a kind of PCB board solidification oven, to solve the problem that the drying and solidification mode of traditional oven to PCB board cannot let the upper side and lower side of PCB board air heating drying simultaneously, leading to low coating solidification efficiency and high drying cost.

[0004] The utility model provides a kind of PCB board solidification oven, including box, the upper side of the box is equipped with control panel, the rear side of box is welded with machine shell, the rear side of machine shell is connected with backplate by bolt, the rear side of box is connected with control machine by bolt, the rear side of box is equipped with fan motor and transfer motor, the front side of box is bonded with iron sheet, the front side of box is hinged with window frame, the front side of box is equipped with rectangular through slot, still including guide rod, the motor shaft of fan motor is equipped with fan disc, the outer side of fan disc is rotatably connected with fan frame plate, the outer side of fan frame plate is welded with air inlet pipe, the rear end of air inlet pipe is welded with box, the front end of air inlet pipe is welded with air duct shell, the motor shaft of transfer motor is equipped with driving gear, the outer side of driving gear is meshed with driven gear, the inner side of driven gear is welded with transfer screw rod, transfer screw rod is rotatably connected in the inner side of box, the inner side of box is welded with support rod, the left end and right end of guide rod are welded with sliding frame, the outer side of guide rod is slidably connected with clamping plate.

[0005] Further, the sliding frame is a concave structure, the concave structure of the sliding frame is rotationally connected with a bidirectional threaded rod, the outer side of the bidirectional threaded rod is welded with a rotating knob, the lower side of the sliding frame is provided with a square through slot, the left side and the right side of the sliding frame are provided with protrusions near the rear end, the protrusion on the left side of the sliding frame is provided with front and rear through threaded holes, the protrusion on the right side of the sliding frame is provided with front and rear through holes, the outer side of the shifting threaded rod is threadedly connected in the threaded holes of the protrusion on the left side of the sliding frame, and the support rod is inserted in the through holes of the protrusion on the right side of the sliding frame.

[0006] Further, the air duct shell is a concave shell structure, the rear side of the air duct shell is provided with a rectangular through slot, five groups of electric heating pipes are mounted in the shell of the air duct shell, the electric heating pipes are opposite to the rectangular through slot of the air duct shell, the upper side wall and the lower side wall of the concave structure of the air duct shell are densely provided with a large number of up and down through air outlet holes, and the air outlet holes of the air duct shell and the square through slot of the sliding frame are opposite to each other.

[0007] Further, the air inlet cylinder is a front and rear through cylinder structure, the front end opening of the air inlet cylinder is opposite to the rectangular through slot on the rear side of the air duct shell, and the upper side and the lower side of the air inlet cylinder are provided with thirteen groups of long slot through slots.

[0008] Further, the number of the clamping plates is two groups, the clamping plates are symmetrically distributed left and right, each group of clamping plates is a T-shaped structure, the PCB circuit board is placed on the upper side of the T-shaped structure of the clamping plate, the opposite surfaces of the two groups of clamping plates are bonded with gaskets, the gaskets are made of high-temperature-resistant rubber material, the left and right through threaded holes and the left and right through holes are arranged on each group of clamping plates, the guide rods are inserted in the through holes of the two groups of clamping plates, the outer side of the bidirectional threaded rod is threadedly connected with the threaded holes of the left clamping plate through the forward threaded end, and the outer side of the bidirectional threaded rod is threadedly connected with the threaded holes of the right clamping plate through the reverse threaded end.

[0009] Further, the inner side of the window frame is bonded with a transparent window plate, and the rear side of the window frame is bonded with a magnetic sheet near the bottom end.

[0010] Compared with the prior art, the utility model has the advantages that:

[0011] 1、In the utility model, the threaded engagement transmission structure formed by the two groups of clamping plates and the bidirectional threaded rod enables the two groups of clamping plates to hold the PCB circuit board in opposite directions and distribute the PCB circuit board inside the concave structure of the air duct shell, the fan disc driven by the fan motor blows the hot air of the electric heating pipe through the air holes in the upper side wall and the lower side wall of the concave structure of the air duct shell to the PCB circuit board at the same time, one-time synchronous drying operation of the upper surface coating and the lower surface coating of the PCB circuit board is realized, the traditional manual overturning operation of the PCB circuit board for twice drying is abandoned, the drying time is reduced, the drying efficiency is improved, and the energy cost for drying the PCB circuit board is saved.

[0012] 2. In the utility model, the transfer motor drives the transfer threaded rod to rotate through a gear meshing transmission mechanism consisting of a driven gear and a driving gear. This causes the transfer threaded rod to move the slide connected to the outer side along the support rod back and forth. This enables the PCB circuit board, which is held by the clamping plate on the slide, to be automatically moved into and out of the box. This avoids the manual operation of taking the PCB circuit board out of the oven and reduces the risk of hand burns. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] Figure 2 This is a front side view sectional structural diagram of this utility model.

[0015] Figure 3 This is a schematic diagram of the rear side sectional structure of this utility model.

[0016] Figure 4 This is a top view of the structure of this utility model.

[0017] Figure 5 This is a front view cross-sectional structural diagram of this utility model.

[0018] Figure 6 This is a top-view cross-section and bottom-view structural schematic diagram of this utility model.

[0019] Figure 7 This is the utility model Figure 2 Enlarged structural diagram of part A in the middle.

[0020] Reference numerals: 1. Housing; 2. Control panel; 3. Window frame; 4. Transparent window panel; 5. Housing; 6. Back panel; 7. Transfer threaded rod; 8. Air duct housing; 9. Carriage; 10. Driven gear; 11. Air inlet; 12. Heating element; 13. PCB circuit board; 14. Two-way threaded rod; 15. Knob; 16. Clamping plate; 17. Guide rod; 18. Gasket; 19. Fan motor; 20. Transfer motor; 21. Control unit; 22. Fan disc; 23. Fan bracket plate; 24. Drive gear; 25. Support rod; 26. Iron sheet; 27. Magnetic sheet. Detailed Implementation

[0021] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0022] like Figures 1-7As shown, this utility model provides a PCB board curing oven, including a chamber 1; a control panel 2 is installed on the upper side of the chamber 1, a housing 5 is welded to the rear side of the chamber 1, a back plate 6 is bolted to the rear side of the housing 5, a control unit 21 is bolted to the rear side of the chamber 1, a fan motor 19 and a transfer motor 20 are installed on the rear side of the chamber 1, an iron sheet 26 is glued to the front side of the chamber 1, a window frame 3 is hinged to the front side of the chamber 1, and a rectangular through slot is provided on the front side of the chamber 1; it also includes a guide rod 17; a fan disc 22 is installed on the motor shaft of the fan motor 19, and the outer side of the fan disc 22... A fan bracket plate 23 is rotatably connected. An air inlet duct 11 is welded to the outer side of the fan bracket plate 23. A housing 1 is welded to the rear end of the air inlet duct 11. An air duct shell 8 is welded to the front end of the air inlet duct 11. A drive gear 24 is mounted on the motor shaft of the transfer motor 20. A driven gear 10 is meshed with the outer side of the drive gear 24. A transfer threaded rod 7 is welded to the inner side of the driven gear 10. The transfer threaded rod 7 is rotatably connected to the inner side of the housing 1. A support rod 25 is welded to the inner side of the housing 1. A slide 9 is welded to both the left and right ends of the guide rod 17. A clamping plate 16 is slidably connected to the outer side of the guide rod 17.

[0023] In this embodiment, the slide 9 has a U-shaped structure. A bidirectional threaded rod 14 is rotatably connected to the inner side of the U-shaped structure of the slide 9. A knob 15 is welded to the outer side of the bidirectional threaded rod 14. A square through slot is provided on the lower side of the slide 9. Protrusions are provided on the left and right sides of the slide 9 near the rear end. A threaded through hole is provided on the protrusion on the left side of the slide 9, and a through hole is provided on the protrusion on the right side of the slide 9. The outer side of the transfer threaded rod 7 is threadedly engaged with the threaded through hole of the protrusion on the left side of the slide 9. The support rod 25 is inserted into the through hole of the protrusion on the right side of the slide 9. During the rotation of the transfer threaded rod 7 driven by the transfer motor 20, the slide 9 moves back and forth along the support rod 25, so that the PCB circuit board 13 held by the clamping plate 16 on the slide 9 is automatically moved out of the rectangular through slot on the front side of the box 1, avoiding the risk of workers burning their arms when manually taking the PCB board out of the oven.

[0024] In this embodiment, the air duct shell 8 is a U-shaped shell structure. The rear side of the air duct shell 8 is provided with a rectangular through groove. Five sets of electric heating tubes 12 are installed inside the shell of the air duct shell 8. The electric heating tubes 12 and the rectangular through groove of the air duct shell 8 are opposite each other. The upper and lower side walls of the inner side of the U-shaped structure of the air duct shell 8 are densely covered with a large number of vertically penetrating air outlet holes. The air outlet holes of the air duct shell 8 and the square through groove of the slide 9 are vertically opposite each other. The fan motor 19 drives the fan disc 22 to stir the air inside the air inlet duct 11, so that the heat generated by the electric heating tubes 12 is blown towards the air outlet holes of the air duct shell 8. The hot air from the air outlet holes of the air duct shell 8 passes through the square through groove of the slide 9 and blows towards the coating on the lower side of the PCB circuit board 13. This allows the air duct shell 8 to perform synchronous blowing, drying and curing of the coating on the upper and lower sides of the PCB circuit board 13 held inside the U-shaped structure, thereby improving the drying and curing efficiency.

[0025] In this embodiment, the air inlet duct 11 is a cylindrical structure that runs through the front and rear. The front opening of the air inlet duct 11 and the rear side of the air duct shell 8 are provided with rectangular through slots facing each other. The upper and lower sides of the air inlet duct 11 are provided with thirteen sets of long through slots. The hot air in the housing 1 is drawn back into the air duct shell 8 by the fan disc 22 through the long through slots of the air duct shell 8 for air circulation and heating.

[0026] In this embodiment, there are two sets of clamping plates 16, which are symmetrically distributed on the left and right sides. Each set of clamping plates 16 has a T-shaped structure. A PCB circuit board 13 is placed on the upper side of the T-shaped structure of the clamping plate 16. A gasket 18 is glued to the opposite side of the two sets of clamping plates 16. The gasket 18 is made of high-temperature resistant rubber. Each set of clamping plates 16 has a threaded through hole and a through hole. The guide rod 17 is inserted into the through holes of the two sets of clamping plates 16. The positive threaded end of the outer side of the bidirectional threaded rod 14 is engaged with the threaded through hole of the left clamping plate 16, and the negative threaded end of the outer side of the bidirectional threaded rod 14 is engaged with the threaded through hole of the right clamping plate 16. During the rotation of the bidirectional threaded rod 14, it drives the two sets of clamping plates 16 to move in opposite directions along the guide rod 17, so that the two sets of clamping plates 16 clamp and fix the PCB circuit boards 13 of different sizes, allowing the PCB circuit boards 13 to be arranged inside the concave structure of the air duct shell 8 for vertical drying.

[0027] In this embodiment, a transparent window panel 4 is bonded to the inner side of the window frame 3, and a magnetic sheet 27 is bonded to the rear side of the window frame 3 near the bottom. When the window frame 3 is in closed contact with the front side of the box body 1, the magnetic sheet 27 of the window frame 3 is attracted to the iron sheet 26 bonded to the front side of the box body 1, so that the window frame 3 and the box body 1 are in stable contact and closed, preventing the hot air flowing inside the box body 1 from blowing open the window frame 3 and causing heat to escape and dissipate from the rectangular through-slot on the front side of the box body 1.

[0028] The specific usage and function of this embodiment are as follows:

[0029] In this invention, during the double-sided drying of the PCB circuit board 13, the PCB circuit board 13 is held between two sets of clamping plates 16 in a T-shape. The other hand then turns the knob 15, causing the bidirectional threaded rod 14 to rotate synchronously. Since the forward and reverse threaded ends of the outer surface of the bidirectional threaded rod 14 are respectively engaged in the threaded through holes of the two sets of clamping plates 16, the bidirectional threaded rod 14 drives the clamping plates 16 to move left and right in opposite directions along the guide rod 17 until the gaskets 18 bonded to the two sets of clamping plates 16 are tightly attached to the left and right ends of the PCB circuit board 13. At this point, the PCB circuit board 13 is clamped between the clamping plates 16. Then, control commands are input from the control panel 2. The control panel 2 transmits control signals to the controller 21 via wires. The controller 21 then starts the transfer motor 20 via wires. The transfer motor 20 drives the drive gear 24 to rotate, which in turn drives the transfer threaded rod 7, which is welded to the driven gear 10, to rotate. The transfer threaded rod 7 drives the slide 9, which is threadedly engaged on its outer side, to move backward along the support rod 25. The slide 9, carrying the PCB circuit board 13 held by the clamping plate 16, extends into the housing 1 until the PCB circuit board 13 is transferred to the inner side of the U-shaped structure of the air duct shell 8. Then, the controller 21 starts the fan motor 19 and the heating element 12 via wires. The heating element 12 generates heat to heat the air inside the air duct shell 8. The fan motor 19 drives the fan disc 22 to rotate at high speed. The fan disc 22 agitates the air in the air inlet duct 11, causing the air inside the housing 1 to be drawn into the air inlet duct 11 through the long slot. Then, the fan disc 22 blows the air in the air inlet duct 11 towards the heating element 12. The heat from the air in the heating element 12 is blown along the air duct shell 8 towards the ventilation holes of the U-shaped structure of the air duct shell 8. Since the PCB circuit board 13 is located inside the U-shaped structure of the air duct shell 8, the hot air passes through the ventilation holes of the air duct shell 8 and the square slot of the slide 9 and blows onto the upper and lower surfaces of the PCB circuit board 13 to perform the hot air drying and curing of the surface coating of the PCB circuit board 13. When the PCB circuit board 13 is dry... After curing, the control unit 21 controls the heating tube 12 and fan motor 19 to turn off via wires. The control unit 21 also controls the transfer motor 20 to rotate in the opposite direction via wires. The transfer motor 20 drives the slide 9, which is threadedly connected to the outer side of the transfer threaded rod 7, to move forward along the support rod 25 through the gear meshing transmission structure formed by the drive gear 24 and the driven gear 10. The front end of the slide 9 pushes open the window frame 3. At this time, the magnetic sheet 27 attached to the window frame 3 is separated from the iron sheet 26, and the window frame 3 flips upward. The slide 9 then drives the PCB circuit board 13 held by the clamping plate 16 to pass through the rectangular through slot on the front side of the box 1 and automatically transfer it to the outside of the box 1, completing the automatic removal of the PCB circuit board 13 after double-sided drying.

[0030] All the above components are installed, connected, or set up using common mechanical methods, such as welding, threaded connections, and screw connections. Furthermore, the specific structure, model, and coefficient indicators of all components are based on their own technologies; any method that achieves the desired effect can be implemented. The control panel 2, fan motor 19, transfer motor 20, and control unit 21 mentioned above are all common market components. Upon purchase and use, simply connect them according to the instruction manual provided; therefore, further details are omitted here.

[0031] The technical solution of this utility model is not limited to the scope of the embodiments of this utility model. All technical contents not described in detail in this utility model are known technologies.

Claims

1. A PCB board curing oven, comprising a box body (1); a control panel (2) is installed on the upper side of the box body (1), a shell (5) is welded to the rear side of the box body (1), a back plate (6) is bolted to the rear side of the shell (5), a control unit (21) is bolted to the rear side of the box body (1), a fan motor (19) and a transfer motor (20) are installed on the rear side of the box body (1), an iron sheet (26) is glued to the front side of the box body (1), a window frame (3) is hinged to the front side of the box body (1), and a rectangular through groove is provided on the front side of the box body (1); characterized in that: It also includes a guide rod (17); a fan disc (22) is mounted on the motor shaft of the fan motor (19), a fan frame plate (23) is rotatably connected to the outer side of the fan disc (22), an air inlet duct (11) is welded to the outer side of the fan frame plate (23), a housing (1) is welded to the rear end of the air inlet duct (11), and an air duct shell (8) is welded to the front end of the air inlet duct (11); a drive gear (24) is mounted on the motor shaft of the transfer motor (20), a driven gear (10) is meshed to the outer side of the drive gear (24), a transfer threaded rod (7) is welded to the inner side of the driven gear (10), the transfer threaded rod (7) is rotatably connected to the inner side of the housing (1), and a support rod (25) is welded to the inner side of the housing (1); a slide (9) is welded to the left and right ends of the guide rod (17), and a clamp plate (16) is slidably connected to the outer side of the guide rod (17).

2. The PCB board curing oven as described in claim 1, characterized in that: The slide (9) has a U-shaped structure. A two-way threaded rod (14) is rotatably connected to the inner side of the U-shaped structure of the slide (9). A knob (15) is welded to the outer side of the two-way threaded rod (14). A square through groove is provided on the lower side of the slide (9). A protrusion is provided on the left side and right side of the slide (9) near the rear end. A threaded through hole is provided on the protrusion on the left side of the slide (9). A through hole is provided on the protrusion on the right side of the slide (9). The threaded rod (7) is threadedly engaged with the outer side of the transfer threaded rod (7) in the threaded through hole of the protrusion on the left side of the slide (9). The support rod (25) is inserted into the through hole of the protrusion on the right side of the slide (9).

3. The PCB board curing oven as described in claim 1, characterized in that: The air duct shell (8) is a U-shaped shell structure. The rear side of the air duct shell (8) is provided with a rectangular through groove. Five sets of electric heating tubes (12) are installed inside the shell of the air duct shell (8). The electric heating tubes (12) and the rectangular through groove of the air duct shell (8) are opposite each other. The upper and lower side walls of the inner side of the U-shaped structure of the air duct shell (8) are densely covered with a large number of vertically penetrating air outlet holes. The air outlet holes of the air duct shell (8) and the square through groove of the slide (9) are opposite each other vertically.

4. The PCB board curing oven as described in claim 1, characterized in that: The air inlet duct (11) is a cylindrical structure that runs through the front and back. The front opening of the air inlet duct (11) and the rear side of the air duct shell (8) are provided with rectangular through slots facing each other. The upper and lower sides of the air inlet duct (11) are provided with thirteen sets of long through slots.

5. The PCB board curing oven as described in claim 1, characterized in that: The number of clamps (16) is two sets, and the clamps (16) are symmetrically distributed on the left and right. Each set of clamps (16) has a T-shaped structure. A PCB circuit board (13) is placed on the upper side of the T-shaped structure of the clamps (16). A gasket (18) is glued to the opposite side of the two sets of clamps (16). The gasket (18) is made of high temperature resistant rubber. Each set of clamps (16) has a threaded through hole and a through hole. The guide rod (17) is inserted into the through hole of the two sets of clamps (16). The positive thread end of the outer side of the bidirectional threaded rod (14) is engaged and connected to the threaded through hole of the left clamp (16). The reverse thread end of the outer side of the bidirectional threaded rod (14) is engaged and connected to the threaded through hole of the right clamp (16).

6. The PCB board curing oven as described in claim 1, characterized in that: A transparent window panel (4) is glued to the inner side of the window frame (3), and a magnetic sheet (27) is glued to the rear side of the window frame (3) near the bottom.

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