Tunnel drying oven with good dustproof effect for circuit board processing

Abstract

The invention discloses a tunnel drying oven with a good dustproof effect for circuit board processing, and belongs to the technical field of circuit board processing. The tunnel drying oven comprises a drying oven, the drying oven is fixedly installed on one side of the upper end of a workbench, an inlet is formed in one end of the drying oven, an air inlet pipe is fixed to the upper end of the drying oven, an air heater is installed in the air inlet pipe, and an exhaust pipe is fixed to the end, away from the inlet, of the drying oven; by arranging the clamping assembly, a circuit board needing to be dried is placed in a first folding plate and a second folding plate, a screw rod is screwed to push a pressing plate to press and fix the two ends of the circuit board, then a first motor is started to drive the screw rod to rotate, the screw rod rotates to drive a sliding base to move in a sliding groove, and the sliding base drives a moving frame to enter the drying oven through an inlet; and then an air heater can be started to blow out hot air to the circuit board through an air inlet pipe, so that the coating on the circuit board is dried, the drying effect on the circuit board is better by arranging a clamping assembly, manual turnover is not needed, and the working efficiency of the device is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of circuit board processing, and particularly relates to a tunnel oven for circuit board processing with good dust-proof effect. Background Art

[0002] The names of circuit boards include: ceramic circuit board, alumina ceramic circuit board, aluminum nitride ceramic circuit board, circuit board, PCB board, aluminum substrate, high-frequency board, thick copper board, impedance board, PCB, ultra-thin circuit board, ultra-thin circuit board, printed (copper etching technology) circuit board, etc.

[0003] The existing technologies have the following problems: 1. The existing oven for circuit board processing has a poor drying effect on the circuit board, unable to rotate the circuit board to be dried, and has a low drying range for the circuit board; 2. The existing oven for circuit board processing has a poor dust-proof effect. When the circuit board enters the oven for drying or when the device is not in use, the inlet cannot be sealed, and external impurities are likely to enter the oven through the inlet. At the same time, the heat inside the oven is easily lost; 3. The existing oven for circuit board processing cannot prevent dust from entering the air inlet pipe and the exhaust pipe, and is likely to blow dust into the oven during the drying operation. Summary of the Invention

[0004] To solve the problems raised in the above background art, the present invention provides a tunnel oven for circuit board processing with good dust-proof effect, which has the characteristics of good drying effect on the circuit board and difficult entry of dust and other impurities into the oven.

[0005] To achieve the above object, the present invention provides the following technical solution: A tunnel oven for circuit board processing with good dust-proof effect, including an oven, the oven is fixedly installed on one side of the upper end of the workbench, an inlet is provided at one end of the oven, a hot air blower is installed inside an air inlet pipe fixed to the upper end of the oven, an exhaust pipe is fixed to the end of the oven away from the inlet, a filtering component is provided in both the air inlet pipe and the exhaust pipe, a sealing component is provided in the inlet, and a clamping component is provided on one side of the upper end of the oven; The clamping component includes a moving frame, a first motor, a first folding plate, a second folding plate, a sliding seat, a sliding groove, a second motor, a lead screw, a material receiving component, a screw rod and a pressing plate. Among them, a first motor is installed at the position corresponding to the inlet at one end of the workbench, a lead screw is provided at the output end of the first motor, a sliding seat is threadedly connected to the surface of the lead screw, a sliding groove corresponding to the sliding seat is provided on the upper end of the workbench, a moving frame is fixed to the upper end of the sliding seat, a second motor is installed on the upper side of one end of the moving frame, a first folding plate is provided at the output end of the second motor, a second folding plate is rotatably connected to the position corresponding to the first folding plate at one end inside the moving frame, screw rods are threadedly connected to both the second folding plate and the first folding plate, a pressing plate is rotatably connected to one end of the screw rod, and a material receiving component is provided in the moving frame.

[0006] Further, the material receiving assembly includes a material receiving box, a rib, and a groove. Specifically, the material receiving box is arranged in the moving frame, ribs are fixed on both sides of the lower end of the material receiving box, and grooves corresponding to the ribs are formed in the moving frame.

[0007] Further, the pressing plates on the sides of the first folding plate and the second folding plate are in close contact with the sides of the first folding plate and the second folding plate, and a bearing rotating seat is arranged between the screw rod and the pressing plate.

[0008] Further, the sealing assembly includes a baffle plate, a rotating shaft, a turbine, a fixing plate, a motor three, and a worm. Specifically, the baffle plate is arranged in the inlet, the baffle plate is connected to the drying oven through the rotating shaft, a turbine is fixed at one end of one side of the rotating shaft, two fixing plates are fixed at the position corresponding to the turbine at the front end of the drying oven, a motor three is installed at the position corresponding to the turbine at the upper end of the upper fixing plate, and a worm is arranged at the output end of the motor three.

[0009] Further, the sealing assembly further includes a rotating plate, a fixing rod, and an arc-shaped groove. Specifically, a rotating plate is fixed at one end of the other side of the rotating shaft, a fixing rod is fixed at one end of the rotating plate close to the drying oven, and an arc-shaped groove corresponding to the fixing rod is formed at the rear end of the drying oven.

[0010] Further, the arc-shaped groove is arranged with the rotating shaft as the center, and the side of the end of the fixing rod away from the rotating plate is in close contact with the inner wall of the arc-shaped groove.

[0011] Further, the filtering assembly includes a dust-proof plate, a clamping block, a clamping groove, a fixing bolt, and a fixing hole. Specifically, dust-proof plates are arranged in both the air inlet pipe and the air outlet pipe, clamping blocks are fixed at both ends of the dust-proof plate, clamping grooves corresponding to the clamping blocks are formed in both the air inlet pipe and the air outlet pipe, the clamping blocks are connected to the air inlet pipe and the air outlet pipe through fixing bolts, and fixing holes corresponding to the fixing bolts are formed at one end of the clamping block.

[0012] Further, perforations corresponding to the fixing bolts are formed at both ends of the air inlet pipe and the air outlet pipe, and the side of the dust-proof plate is in close contact with the inner walls of the air inlet pipe and the air outlet pipe after the dust-proof plate is placed in the air inlet pipe and the air outlet pipe.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. By setting the clamping assembly in the present invention, the circuit board to be dried is placed between the first folding plate and the second folding plate. The screw rod is rotated to push the pressing plate to press and fix both ends of the circuit board. Then, the motor one is started to drive the screw rod to rotate. The rotation of the screw rod drives the sliding seat to move in the sliding groove, and the sliding seat drives the moving frame to enter the drying oven through the inlet. Then, the hot air blower can be started to blow hot air to the circuit board through the air inlet pipe, so as to dry the coating on the circuit board. At the same time, the motor two can be started to drive the first folding plate to rotate, so as to drive the circuit board to rotate and turn over. By setting the clamping assembly, the drying effect of the circuit board is better, and manual turning over is not required, improving the working efficiency of the device.

[0014] 2. After the circuit board enters the oven, the present invention seals the inlet by setting a sealing component. When the motor three is started to drive the worm to rotate, the rotation of the worm drives the rotating shaft to rotate through the turbine. The rotation of the rotating shaft can drive the baffle to rotate to seal the inlet. By setting the sealing component, the inlet can be sealed to avoid heat loss or entry of external impurities into the oven during the drying process.

[0015] 3. By setting a filtering component, the present invention places the dust-proof plate in the air inlet pipe or the air outlet pipe. At the same time, the clamping blocks at both ends of the dust-proof plate enter the clamping grooves, and then the fixing bolts can be screwed into the fixing holes on the sides of the clamping blocks to achieve the effect of limiting and fixing the clamping blocks and the dust-proof plate. The dust-proof plate can play a role in preventing dust, avoiding dust and other impurities from entering the oven through the air inlet pipe and the air outlet pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a perspective view of the present invention; Figure 2 is a rear perspective view of the present invention; Figure 3 is a sectional perspective view of the workbench and the oven of the present invention; Figure 4 is a perspective view of the present invention when the material receiving box is installed; Figure 5 is a perspective view of the present invention when the dust-proof plate is installed; Figure 6 For the present invention Figure 1 is an enlarged view of part A; Figure 7 For the present invention Figure 2 is an enlarged view of part B; In the figure: 1, oven; 2, clamping component; 21, moving frame; 22, motor one; 23, folding plate one; 24, folding plate two; 25, sliding seat; 26, sliding groove; 27, motor two; 28, lead screw; 29, material receiving component; 291, material receiving box; 292, convex strip; 293, groove; 210, screw rod; 211, pressing plate; 3, sealing component; 31, baffle; 32, rotating shaft; 33, turbine; 34, fixing plate; 35, motor three; 36, worm; 37, rotating plate; 38, fixing rod; 39, arc groove; 4, filtering component; 41, dust-proof plate; 42, clamping block; 43, clamping groove; 44, fixing bolt; 45, fixing hole; 5, air inlet pipe; 6, workbench; 7, inlet; 8, air outlet pipe; 9, hot air blower. DETAILED DESCRIPTION OF THE INVENTION

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention. Embodiment

[0018] Please refer to Figure 1-7 , the present invention provides the following technical solutions: A tunnel oven for circuit board processing with good dust prevention effect, including an oven 1, the oven 1 is fixedly installed on one side of the upper end of the workbench 6, an inlet 7 is opened at one end of the oven 1, an air inlet pipe 5 is fixed to the upper end of the oven 1, a hot air blower 9 is installed inside the air inlet pipe 5, a exhaust pipe 8 is fixed to the end of the oven 1 away from the inlet 7, filter components 4 are provided in both the air inlet pipe 5 and the exhaust pipe 8, a sealing component 3 is provided in the inlet 7, and a clamping component 2 is provided on one side of the upper end of the oven 1; The clamping component 2 includes a moving frame 21, a first motor 22, a first folding plate 23, a second folding plate 24, a sliding seat 25, a sliding groove 26, a second motor 27, a lead screw 28, a material receiving component 29, a screw 210 and a pressing plate 211. Among them, a first motor 22 is installed at the position of the workbench 6 corresponding to the inlet 7 at one end, a lead screw 28 is provided at the output end of the first motor 22, a sliding seat 25 is threadedly connected to the surface of the lead screw 28, a sliding groove 26 corresponding to the sliding seat 25 is opened at the upper end of the workbench 6, a moving frame 21 is fixed to the upper end of the sliding seat 25, a second motor 27 is installed on the upper side of one end of the moving frame 21, a first folding plate 23 is provided at the output end of the second motor 27, a second folding plate 24 is rotatably connected to the position of the moving frame 21 corresponding to the first folding plate 23 at the inner end, screw 210 are threadedly connected to both the second folding plate 24 and the first folding plate 23, a pressing plate 211 is rotatably connected to one end of the screw 210, and a material receiving component 29 is provided in the moving frame 21.

[0019] Further in the present invention, the material receiving component 29 includes a material receiving box 291, convex strips 292 and grooves 293. Among them, a material receiving box 291 is provided in the moving frame 21, convex strips 292 are fixed to both sides of the lower end of the material receiving box 291, and grooves 293 corresponding to the convex strips 292 are opened in the moving frame 21.

[0020] By adopting the above technical solutions, the material receiving box 291 is placed in the moving frame 21, and at the same time, the convex strips 292 on both sides of the lower end of the material receiving box 291 enter the grooves 293 of the moving frame 21 to limit the material receiving box 291. The material receiving box 291 can receive the paint dripping on the circuit board, avoiding the paint falling on the moving frame 21 and causing pollution.

[0021] Further, in the present invention, the side of the pressing plate 211 in the first folding plate 23 and the second folding plate 24 is in close contact with the sides of the first folding plate 23 and the second folding plate 24, and a bearing rotating seat is provided between the screw 210 and the pressing plate 211.

[0022] By adopting the above technical solution, the rotation of the screw 210 can push the pressing plate 211 to move in the first folding plate 23 and the second folding plate 24.

[0023] When this embodiment is in use, when the tunnel oven 1 for processing circuit boards with good dust-proof effect is in use, the device is installed in a suitable position. By setting the clamping assembly 2, the circuit board to be dried is placed into the first folding plate 23 and the second folding plate 24. The screw 210 is turned to push the pressing plate 211 to press and fix both ends of the circuit board. Then, the first motor 22 is started to drive the lead screw 28 to rotate. The rotation of the lead screw 28 drives the sliding seat 25 to move in the sliding groove 26. The sliding seat 25 drives the moving frame 21 to enter the oven 1 through the inlet 7. Then, the hot air blower 9 can be started to blow hot air to the circuit board through the air inlet pipe 5, so as to dry the coating on the circuit board. At the same time, the second motor 27 can be started to drive the first folding plate 23 to rotate, so as to drive the circuit board to rotate and turn over. By setting the clamping assembly 2, the drying effect of the circuit board is better, and manual turning over is not required, improving the working efficiency of the device. By setting the material receiving assembly 29, the material receiving box 291 is placed into the moving frame 21. At the same time, the protrusions 292 on both sides of the lower end of the material receiving box 291 enter the grooves 293 of the moving frame 21 to limit the material receiving box 291. The material receiving box 291 can receive the coating dripping from the circuit board, avoiding the coating falling on the moving frame 21 and causing pollution; Embodiment

[0024] The difference between this embodiment and Embodiment 1 is that the sealing assembly 3 includes a baffle 31, a rotating shaft 32, a turbine 33, a fixing plate 34, a third motor 35 and a worm 36. Among them, a baffle 31 is arranged in the inlet 7. The baffle 31 is connected to the oven 1 through the rotating shaft 32. One end of the rotating shaft 32 on one side is fixed with a turbine 33. Two fixing plates 34 are fixed at the position corresponding to the turbine 33 at the front end of the oven 1. A third motor 35 is installed at the position corresponding to the turbine 33 at the upper end of the upper fixing plate 34. The output end of the third motor 35 is provided with a worm 36.

[0025] By adopting the above technical solution, after the circuit board enters the oven 1, the third motor 35 is started to drive the worm 36 to rotate. The rotation of the worm 36 drives the rotating shaft 32 to rotate through the turbine 33. The rotation of the rotating shaft 32 can drive the baffle 31 to rotate to seal the inlet 7. By setting the sealing assembly 3, the inlet 7 can be sealed, avoiding heat loss or external impurities entering the oven 1 during the drying operation.

[0026] Further in the present invention, the sealing assembly 3 further includes a rotating plate 37, a fixing rod 38 and an arc-shaped groove 39. One end of the other side rotating shaft 32 is fixed with the rotating plate 37. One end of the rotating plate 37 close to the oven 1 is fixed with the fixing rod 38. An arc-shaped groove 39 corresponding to the fixing rod 38 is formed at the rear end of the oven 1.

[0027] By adopting the above technical solution, when the baffle 31 rotates, one end of the fixing rod 38 on the side of the rotating plate 37 at one end of the rotating shaft 32 slides in the arc-shaped groove 39. By providing the rotating plate 37, etc., the rotation of the baffle 31 can be limited.

[0028] Further in the present invention, the arc-shaped groove 39 is arranged with the rotating shaft 32 as the center of the circle, and the side of the end of the fixing rod 38 away from the rotating plate 37 is in close contact with the inner wall of the arc-shaped groove 39.

[0029] By adopting the above technical solution, one end of the fixing rod 38 can slide in the arc-shaped groove 39 when the baffle 31 rotates.

[0030] When this embodiment is in use, by providing the sealing assembly 3, after the circuit board enters the oven 1, the motor three 35 is started to drive the worm 36 to rotate. The rotation of the worm 36 drives the rotating shaft 32 to rotate through the turbine 33. The rotation of the rotating shaft 32 can drive the baffle 31 to rotate to seal the inlet 7. By providing the sealing assembly 3, the inlet 7 can be sealed to avoid heat loss or external impurities entering the oven 1 during the drying work. When the baffle 31 rotates, one end of the fixing rod 38 on the side of the rotating plate 37 at one end of the rotating shaft 32 slides in the arc-shaped groove 39. By providing the rotating plate 37, etc., the rotation of the baffle 31 can be limited; Embodiment

[0031] The difference between this embodiment and Embodiment 1 and Embodiment 2 is that the filtering assembly 4 includes a dust-proof plate 41, a clamping block 42, a clamping groove 43, a fixing bolt 44 and a fixing hole 45. Among them, dust-proof plates 41 are arranged in both the air inlet pipe 5 and the air outlet pipe 8. Clamping blocks 42 are fixed at both ends of the dust-proof plate 41. Clamping grooves 43 corresponding to the clamping blocks 42 are formed in both the air inlet pipe 5 and the air outlet pipe 8. The clamping blocks 42 and the air inlet pipe 5 and the air outlet pipe 8 are connected by fixing bolts 44 respectively. Fixing holes 45 corresponding to the fixing bolts 44 are formed at one end of the clamping blocks 42.

[0032] By adopting the above technical solution, the dust-proof plate 41 is placed in the air inlet pipe 5 or the air outlet pipe 8. At the same time, the clamping blocks 42 at both ends of the dust-proof plate 41 enter the clamping grooves 43. Then the fixing bolts 44 can be screwed into the fixing holes 45 on the side of the clamping blocks 42 to achieve the effect of limiting and fixing the clamping blocks 42 and the dust-proof plate 41. The dust-proof plate 41 can play a role in dust prevention and avoid dust and other impurities from entering the oven 1 through the air inlet pipe 5 and the air outlet pipe 8.

[0033] Furthermore, in the present invention, perforations corresponding to the fixing bolts 44 are provided at both ends of the air inlet pipe 5 and the air outlet pipe 8. After the dust-proof plate 41 is placed into the air inlet pipe 5 and the air outlet pipe 8, the sides of the dust-proof plate 41 are in close contact with the inner walls of the air inlet pipe 5 and the air outlet pipe 8.

[0034] By adopting the above technical solution, the fixing bolts 44 can penetrate into the air inlet pipe 5 and the air outlet pipe 8 and be screwed into the fixing holes 45 on the sides of the clamping blocks 42. After the dust-proof plate 41 is placed into the air inlet pipe 5 and the air outlet pipe 8, the sides of the dust-proof plate 41 are more closely attached to the inner walls of the air inlet pipe 5 and the air outlet pipe 8.

[0035] When this embodiment is in use, by setting the filtering component 4, the dust-proof plate 41 is placed into the air inlet pipe 5 or the air outlet pipe 8. At the same time, the clamping blocks 42 at both ends of the dust-proof plate 41 enter the clamping grooves 43. Then, the fixing bolts 44 can be screwed into the fixing holes 45 on the sides of the clamping blocks 42 to achieve the effect of limiting and fixing the clamping blocks 42 and the dust-proof plate 41. The dust-proof plate 41 can play a role in dust prevention and prevent dust and other impurities from entering the oven 1 through the air inlet pipe 5 and the air outlet pipe 8.

[0036] The first motor 22 in the present invention is an existing publicly disclosed technology, and the selected model is 5IK120GN-CF.

[0037] The second motor 27 in the present invention is an existing publicly disclosed technology, and the selected model is Z60-55ZY.

[0038] The third motor 35 in the present invention is an existing publicly disclosed technology, and the selected model is YS71 / 80.

[0039] The hot air blower 9 in the present invention is an existing publicly disclosed technology, and the selected model is DH1-20.

[0040] Working principle and usage process of the present invention: When the tunnel oven 1 for processing circuit boards with good dust-proof effect is in use, the device is installed at a suitable position. By setting the clamping assembly 2, the circuit board to be dried is placed into the first folding plate 23 and the second folding plate 24. The screw 210 is turned to push the pressing plate 211 to press and fix both ends of the circuit board. Then, the first motor 22 is started to drive the lead screw 28 to rotate. The rotation of the lead screw 28 drives the sliding seat 25 to move in the sliding groove 26. The sliding seat 25 drives the moving frame 21 to enter the oven 1 through the inlet 7. Then, the hot air blower 9 can be started to blow hot air to the circuit board through the air inlet pipe 5, so as to dry the coating on the circuit board. At the same time, the second motor 27 can be started to drive the first folding plate 23 to rotate, so as to drive the circuit board to rotate and turn over. By setting the clamping assembly 2, the drying effect of the circuit board is better, and there is no need for manual turning over, which improves the working efficiency of the device. By setting the material receiving assembly 29, the material receiving box 291 is placed into the moving frame 21. At the same time, the convex strips 292 on both sides of the lower end of the material receiving box 291 enter the grooves 293 of the moving frame 21 to limit the material receiving box 291. The material receiving box 291 can receive the coating dripping from the circuit board, avoiding the coating falling on the moving frame 21 and causing pollution. By setting the sealing assembly 3, after the circuit board enters the oven 1, the third motor 35 is started to drive the worm 36 to rotate. The rotation of the worm 36 drives the rotating shaft 32 to rotate through the turbine 33. The rotation of the rotating shaft 32 can drive the baffle 31 to rotate to seal the inlet 7. By setting the sealing assembly 3, the inlet 7 can be sealed, avoiding heat loss or external impurities entering the oven 1 during the drying work. When the baffle 31 rotates, one end of the rotating shaft 32 and one end of the fixed rod 38 on the side of the rotating plate 37 at one end slide in the arc-shaped groove 39. By setting the rotating plate 37, etc., the rotation of the baffle 31 can be limited. By setting the filtering assembly 4, the dust-proof plate 41 is placed into the air inlet pipe 5 or the exhaust pipe 8. At the same time, the clamping blocks 42 at both ends of the dust-proof plate 41 enter the clamping grooves 43. Then, the fixing bolts 44 can be screwed into the fixing holes 45 on the side of the clamping blocks 42 to achieve the effect of limiting and fixing the clamping blocks 42 and the dust-proof plate 41. The dust-proof plate 41 can play a dust-proof role, avoiding dust and other impurities entering the oven 1 through the air inlet pipe 5 and the exhaust pipe 8.

[0041] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A tunnel oven for processing circuit boards with good dustproof effect, comprising an oven (1), the oven (1) being mounted and fixed on one side of the upper end of a workbench (6), an inlet (7) being provided at one end of the oven (1), an air inlet pipe (5) being fixed at the upper end of the oven (1), a hot air blower (9) being installed inside the air inlet pipe (5), an exhaust pipe (8) being fixed at one end of the oven (1) away from the inlet (7), and characterized in that: A filter assembly (4) is provided in both the air inlet pipe (5) and the air outlet pipe (8), a sealing assembly (3) is provided in the inlet (7), and a clamping assembly (2) is provided on one side of the upper end of the oven (1); The clamping assembly (2) comprises a moving frame (21), a motor 1 (22), a folding plate 1 (23), a folding plate 2 (24), a slide seat (25), a slide groove (26), a motor 2 (27), a screw rod (28), a material receiving assembly (29), a screw rod (210) and a pressing plate (211), wherein the motor 1 (22) is installed at a position corresponding to the inlet (7) at one end of the workbench (6), the screw rod (28) is arranged at the output end of the motor 1 (22), the surface of the screw rod (28) is threadedly connected to the slide seat (25), and the upper end of the workbench (6) is provided with a screw rod (28) connected to the slide seat (25). 5) corresponding to the slide groove (26), a moving frame (21) is fixed on the upper end of the slide seat (25), a motor 2 (27) is installed on the upper side of one end of the moving frame (21), a folding plate 1 (23) is arranged at the output end of the motor 2 (27), a folding plate 2 (24) is rotatably connected to the position corresponding to the folding plate 1 (23) inside the moving frame (21), the upper ends of the folding plate 2 (24) and the folding plate 1 (23) are both threadedly connected with a screw rod (210), one end of the screw rod (210) is rotatably connected with a pressing plate (211), and a material receiving assembly (29) is arranged in the moving frame (21).

2. A tunnel oven for circuit board processing with good dustproof effect according to claim 1, characterized in that: The material receiving assembly (29) comprises a material receiving box (291), a convex strip (292) and a groove (293), wherein the material receiving box (291) is arranged in the movable frame (21), convex strips (292) are fixed on both sides of the lower end of the material receiving box (291), and a groove (293) corresponding to the convex strip (292) is opened in the movable frame (21).

3. The tunnel oven for circuit board processing with good dustproof effect according to claim 1, characterized in that: The side edges of the pressing plate (211) in the folding plate one (23) and the folding plate two (24) are tightly attached to the side edges of the folding plate one (23) and the folding plate two (24), and a bearing rotating seat is provided between the screw rod (210) and the pressing plate (211).

4. The tunnel oven for circuit board processing with good dustproof effect according to claim 1, characterized in that: The sealing assembly (3) comprises a baffle (31), a rotating shaft (32), a turbine (33), a fixing plate (34), a third motor (35) and a worm (36), wherein a baffle (31) is arranged in the inlet (7), the baffle (31) is connected to the oven (1) via a rotating shaft (32), a turbine (33) is fixed to one end of the rotating shaft (32), two fixing plates (34) are fixed to a position at the front end of the oven (1) corresponding to the turbine (33), a third motor (35) is installed at a position at the upper end of the upper fixing plate (34) corresponding to the turbine (33), and a worm (36) is arranged at the output end of the third motor (35).

5. The tunnel oven for circuit board processing with good dustproof effect according to claim 4, characterized in that: The sealing assembly (3) further comprises a rotating plate (37), a fixing rod (38) and an arc-shaped groove (39), wherein the rotating plate (37) is fixed to one end of the rotating shaft (32) on the other side, the fixing rod (38) is fixed to one end of the rotating plate (37) close to the oven (1), and the rear end of the oven (1) is provided with an arc-shaped groove (39) corresponding to the fixing rod (38).

6. The tunnel oven for circuit board processing with good dustproof effect according to claim 5, characterized in that: The arc-shaped groove (39) is arranged with the rotating shaft (32) as the center, and the side edge of one end of the fixing rod (38) away from the rotating plate (37) is in close contact with the inner wall of the arc-shaped groove (39).

7. The tunnel oven for circuit board processing with good dustproof effect according to claim 1, characterized in that: The filter assembly (4) comprises a dustproof plate (41), a clamping block (42), a clamping slot (43), a fixing bolt (44) and a fixing hole (45), wherein the air inlet pipe (5) and the air outlet pipe (8) are both provided with a dustproof plate (41), clamping blocks (42) are fixed at both ends of the dustproof plate (41), the air inlet pipe (5) and the air outlet pipe (8) are both provided with a clamping slot (43) corresponding to the clamping block (42), the clamping block (42) is connected to the air inlet pipe (5) and the air outlet pipe (8) via a fixing bolt (44), and one end of the clamping block (42) is provided with a fixing hole (45) corresponding to the fixing bolt (44).

8. The tunnel oven for circuit board processing with good dustproof effect according to claim 7, characterized in that: Both ends of the air inlet pipe (5) and the air exhaust pipe (8) are provided with through holes corresponding to the fixing bolts (44); after the dustproof plate (41) is inserted into the air inlet pipe (5) and the air exhaust pipe (8), the side edges of the dustproof plate (41) are in close contact with the inner walls of the air inlet pipe (5) and the air exhaust pipe (8).

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