Baking device for PCB processing

Abstract

The invention belongs to the technical field of PCB (printed circuit board) processing, in particular to a baking device for PCB processing, and provides the following scheme: the baking device comprises a baking chamber with openings in two sides, a plurality of conveying rollers are rotationally arranged in the baking chamber, the end parts of the conveying rollers are connected with a driving group, and a plurality of heating lamp tubes are arranged in the middle of the baking chamber; the heating lamp tubes are located above the conveying rollers, an upper frame plate is installed at the position, above the heating lamp tubes, in the baking chamber, a lower frame plate is installed at the position, below the conveying rollers, in the baking chamber, a heat insulation belt of an annular structure is rotationally arranged between the upper frame plate and the lower frame plate, and two symmetrically-distributed notches are formed in the outer wall of the heat insulation belt. The heat insulation belt moves on the two sides between the upper frame plate and the lower frame plate. The PCB body is baked in the middle of the relatively sealed area wrapped by the two sides of the upper frame plate, the lower frame plate and the heat insulation belt, the situation that the temperature rises rapidly due to the fact that a large amount of heat is lost is avoided, and the heat insulation belt is always in a moving state, so that hot air is rapidly and evenly distributed.

Description

Technical Field

[0001] The present invention relates to the technical field of PCB board processing, and particularly relates to a baking device for PCB board processing. Background Art

[0002] After PCB board printing and processing, baking operations are required. In the prior art, a plurality of PCB boards are generally fed into a baking chamber at intervals through a conveying mechanism for baking operations.

[0003] Referring to the Chinese patent with the patent announcement number CN119146712B, a PCB board baking device is disclosed, including a baking oven. A plurality of hanging mechanisms are arranged at the inner top of the baking oven. A partition is vertically and fixedly arranged in the middle inside the baking oven. A baking mechanism is arranged on the front side of the partition, and a cooling mechanism is arranged on the rear side of the partition.

[0004] As described above, the baking device and the commonly used baking ovens in the prior art are generally open at both ends for continuous feeding for baking operations. However, this will cause the baking and heating positions to directly contact the external environment over a large area at both ends, resulting in heat loss at the baking positions and affecting the baking efficiency. In order to ensure the baking effect, long-distance baking operations or increased heat are required, both of which will cause excessive waste. Summary of the Invention

[0005] Based on the technical problems in the background art, the present invention proposes a baking device for PCB board processing.

[0006] A baking device for PCB board processing proposed by the present invention includes a baking chamber with openings on both sides. A plurality of conveying rollers are rotatably arranged in the baking chamber. The ends of the conveying rollers are connected to a driving group. A plurality of heating tubes are arranged at the middle position of the baking chamber, and the heating tubes are located above the conveying rollers. An upper shelf plate is installed above the heating tubes in the baking chamber, and a lower shelf plate is installed below the conveying rollers in the baking chamber. A ring-shaped heat insulation belt is rotatably arranged between the upper shelf plate and the lower shelf plate. Two symmetrically distributed notches are formed on the outer wall of the heat insulation belt, and the heat insulation belt moves at both sides between the upper shelf plate and the lower shelf plate.

[0007] Preferably, guiding boxes are installed at both ends of the baking chamber, and the guiding boxes are arranged in an arc-shaped structure that arches away from the baking chamber.

[0008] Preferably, annular chain belts are fixed to the top and bottom ends inside the heat insulation belt, and the chain belt located below is drivingly connected to a rotating mechanism.

[0009] Preferably, sprockets two are rotatably arranged at the four corner positions of the upper shelf plate, and sprockets three are rotatably arranged at the four corner positions of the lower shelf plate. The sprockets two and the sprockets three are meshed with the chain belt.

[0010] Preferably, the rotating mechanism is provided with a rotating motor installed at the middle position of the bottom of the lower frame plate. The output shaft of the rotating motor extends above the lower frame plate. A turntable is fixed to the output shaft of the rotating motor. A toothed ring is installed on the outer wall of the turntable, and the toothed ring meshes with the third sprocket.

[0011] Preferably, the guiding box is provided with an inner plate and an outer plate. The inner plate is located inside the heat insulation belt, and the outer plate is located outside the heat insulation belt. Sealing plates are installed at both the top and bottom between the inner plate and the outer plate.

[0012] Preferably, installation parts are provided at both the top and bottom positions of the inner plate. The installation parts are arranged in an arc structure arched towards the baking chamber. A first sprocket is rotatably arranged at the installation part, and the first sprocket meshes with the chain belt.

[0013] Preferably, a plurality of groups of grooves are formed at the top of the turntable. Each group of grooves is distributed in an annular array in the circumferential direction of the turntable, and the plurality of groups of grooves are staggered. The depth of the grooves gradually decreases in a direction away from the center of the turntable.

[0014] Preferably, a plurality of air guiding mechanisms are arranged in the middle of the heat insulation belt in the baking chamber. The air guiding mechanisms are located between two adjacent conveying rollers, below the outer wall of the top of the conveying rollers. The air guiding mechanism is provided with a fixing rod fixed to the inner wall of the baking chamber. The fixing rod is arranged parallel to the conveying roller. Both ends of the outer wall of the fixing rod are rotatably connected with a rotating sleeve through a torsion spring. Blades are fixed to both sides of the rotating sleeve.

[0015] Preferably, the blades between the two rotating sleeves on the same fixing rod are staggered at intervals in the circumferential direction. The blades fixed to the rotating sleeve extend towards the direction of the other rotating sleeve. A magnetic block is installed at the top of the turntable, and magnetic adsorption is formed between the magnetic block and the blade below the fixing rod.

[0016] The beneficial effects in the present invention are as follows: In the present invention, when the PCB board enters the corresponding area below the heating lamp tube, at this time, the PCB board is in the middle of a relatively sealed area wrapped by the upper frame plate, the lower frame plate and both sides of the heat insulation belt. The heating lamp tube is in this area for heating, and the two sides are blocked by the heat insulation belt to avoid a large amount of heat loss and rapid temperature rise, so as to improve the baking efficiency. And the heat insulation belt is always in a moving state. While isolating the openings at both ends of the baking chamber, the movement of the heat insulation belt can disperse the air flow in this part of the sealed area, and make the temperature in the baking area quickly distribute evenly, thereby effectively improving the baking effect and greatly improving the baking operation efficiency of the PCB.

[0017] In the present invention, during the baking operation, the sprockets II and III at the four corner positions can be rotated to drive the air flow by rotating at the four corner positions of the chamber surrounded by the upper shelf plate, the lower shelf plate and the heat insulation belt. In cooperation with the rotation of the turntable and the movement of the heat insulation belt in the direction perpendicular to the conveying direction, the baking air flow can be evenly dispersed, so that the temperature can rise rapidly and be evenly distributed, thereby improving the baking operation efficiency.

[0018] In the present invention, the two blades above the fixing rod between two adjacent conveying rollers reciprocally open and close to guide the air flow below the PCB board body, so as to improve the temperature rising efficiency of heating and baking around the PCB board body and the baking operation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of a baking device for PCB board processing proposed by the present invention; Figure 2 It is a schematic diagram of the internal structure of the baking chamber of a baking device for PCB board processing proposed by the present invention; Figure 3 It is a schematic diagram of the overall plane sectional structure of a baking device for PCB board processing proposed by the present invention; Figure 4 It is a schematic diagram of the distribution structure of the upper shelf plate, the lower shelf plate and the guide box of a baking device for PCB board processing proposed by the present invention; Figure 5 It is a schematic diagram of the heat insulation belt structure of a baking device for PCB board processing proposed by the present invention; Figure 6 It is a schematic diagram of the guide box structure of a baking device for PCB board processing proposed by the present invention; Figure 7 It is a schematic diagram of the turntable position structure of a baking device for PCB board processing proposed by the present invention; Figure 8 It is a schematic diagram of the distribution structure of the air guiding mechanism of a baking device for PCB board processing proposed by the present invention; Figure 9 It is a schematic diagram of the air guiding mechanism structure of a baking device for PCB board processing proposed by the present invention; Figure 10 It is a schematic diagram of the rotating sleeve and blade structure of a baking device for PCB board processing proposed by the present invention.

[0020] In the figure: 1 baking chamber, 101 top cover, 102 roller hole, 103 lamp trough, 2 conveyor roller, 3 drive group, 4 PCB board, 5 lamp holder, 6 heating lamp tube, 7 upper shelf, 8 lower shelf, 9 insulation belt, 901 notch, 10 chain belt, 11 guide box, 111 inner plate, 112 outer plate, 113 sealing plate, 114 installation part, 12 sprocket one, 13 sprocket two, 14 sprocket three, 15 rotating motor, 16 gear ring, 17 turntable, 171 groove, 18 magnetic block, 19 air entrainment mechanism, 191 fixing rod, 192 rotating sleeve, 193 blade. DETAILED DESCRIPTION

[0021] Example 1: Reference Figures 1-9 A baking device for PCB board processing includes a baking chamber 1 with openings on both sides. A detachably connected top cover 101 is provided on the top of the baking chamber 1 to facilitate the maintenance and replacement of internal components. A plurality of conveying rollers 2 are rotatably arranged in the baking chamber 1. The plurality of conveying rollers 2 are evenly distributed in the horizontal direction. A driving group 3 is connected to the ends of the conveying rollers 2. The conveying rollers 2 are used to convey PCB board bodies 4. It should be noted that roller holes 102 corresponding to the positions of the conveying rollers 2 are provided on the shells at both ends of the baking chamber 1. The two ends of the conveying rollers 2 are rotatably connected to the roller holes 102. The driving group 3 includes a chassis fixed to the outer wall of the baking chamber 1, and a driving motor connected to the conveying roller 2 is installed in the chassis, wherein the conveying rollers 2 corresponding to the chassis can be synchronously rotated by a synchronous belt, gears, etc., so that the PCB board 4 is continuously conveyed by a driving motor with the corresponding multiple conveying rollers 2 rotating synchronously. A plurality of heating lamp tubes 6 are arranged in the middle position of the baking chamber 1, and the plurality of heating lamp tubes 6 are evenly distributed in the horizontal direction. It should be noted that: lamp grooves 103 are opened at both ends of the baking chamber 1, and lamp holders 5 are installed in the lamp grooves. A heating lamp tube 6 is installed between two lamp holders 5; the heating lamp tube 6 is located above the conveying roller 2, and an upper shelf plate 7 is installed above the heating lamp tube 6 in the baking chamber 1, and both ends of the upper shelf plate 7 are fixed to the inner walls of both ends of the baking chamber 1, and a lower shelf plate 8 is installed below the conveying roller 2 in the baking chamber 1, and both ends of the lower shelf plate 8 are fixed to the inner walls of both ends of the baking chamber 1, and an annular insulating belt 9 is rotatably arranged between the upper shelf plate 7 and the lower shelf plate 8, and the outer wall of the insulating belt 9 is provided with two symmetrically distributed notches 901, and the insulating belt 9 is located on both sides between the upper shelf plate 7 and the lower shelf plate 8. The top of the heat insulating belt 9 is in sliding contact with the bottom of the upper frame plate 7, and the bottom of the heat insulating belt 9 is in sliding contact with the top of the lower frame plate 8. It should be noted that: the heating lamp tube 6 is arranged in the middle area of ​​the heat insulating belt 9 of the ring structure, and the end of the conveying roller 2 distributed in the middle area of ​​the heat insulating belt 9 is separately provided with a driving group 3, so that the heat insulating belt 9 passes through the outside of the driving group 3 at this position to ensure the effectiveness of the rotation of the heat insulating belt 9 and the effectiveness of the rotation and conveying of the conveying roller 2 at this position. The heat insulating belt 9 is between the upper frame plate 7 and the lower frame plate 8 and passes between the two conveying rollers 2; During use, the heat insulation belt 9 with a ring structure rotates between the upper shelf plate 7 and the lower shelf plate 8. When one of the notches 901 of the heat insulation belt 9 faces the feeding port of the baking chamber 1, the other notch 901 on the other side of the heat insulation belt 9 exactly faces the discharging port of the baking chamber 1. At this time, the newly fed PCB board body 4 can enter the middle of the heat insulation belt 9 from the notch 901, and the PCB board body 4 originally in the middle of the heat insulation belt 9 can be sent out of the heat insulation belt 9 from the notch 901; when the newly fed PCB board body 4 enters the middle area of the heat insulation belt 9, the heat insulation belt 9 rotates to turn the notch 901 away from the inside of the baking chamber 1, and the position of the heat insulation belt 9 inside the baking chamber 1 can seal both sides. At this time, the PCB board body 4 is in the middle of a relatively sealed area wrapped by the upper shelf plate 7, the lower shelf plate 8 and both sides of the heat insulation belt 9. The heating lamp tube 6 is in this area for heating, and the two sides are sealed by the heat insulation belt 9 to prevent a large amount of heat loss and cause the temperature to rise rapidly, so as to improve the baking efficiency; and during the process of baking the PCB board body 4 in this area, the heat insulation belt 9 is always in a moving state. While isolating the openings at both ends of the baking chamber 1, the movement of the heat insulation belt 9 can disperse the air flow in this part of the sealed area, so that the temperature in the baking area is quickly evenly distributed, thereby effectively improving the baking effect and greatly improving the baking operation efficiency of the PCB. Then, when the notch 901 rotates back into the baking chamber 1 again, the PCB board body 4 is sent out, so that a large amount of heat loss can be effectively reduced and the energy utilization rate can be improved; It should be noted that: by coordinating the conveying speed of the conveying roller 2 and the movement of the heat insulation belt 9, the extension length of the notch 901 can be set to be greater than the width of the PCB board body 4. When the heat insulation belt 9 rotates continuously, by coordinating the movement speeds of the heat insulation belt 9 and the conveying roller 2, the PCB board body 4 can enter the middle position of the heat insulation belt 9 from the moving notch 901; or the notch 901 is slightly larger than the width of the PCB board body 4. When the PCB board body 4 is about to enter or exit, the rotation speed of the heat insulation belt 9 is accelerated, so that the notch 901 quickly moves to the corresponding position of the PCB board body 4 and stops for a short time, and then the heat insulation belt 9 is quickly rotated after the PCB board body 4 passes through the notch 901 to move the notch 901 away.

[0022] In the present invention, guiding boxes 11 are installed at both ends of the baking chamber 1. The guiding boxes 11 are arranged in an arc structure arched away from the baking chamber 1. Both ends of the guiding boxes 11 are open, and a sealed setting is provided between both ends of the guiding boxes 11 and the outer wall of the baking chamber 1. The heat insulation belt 9 moves in the guiding box 11 after passing through the baking chamber 1. Thus, after the annular heat insulation belt 9 moves from one end in the baking chamber 1 to the other end, it enters one of the guiding boxes 11, then enters the baking chamber 1 from the other side, moves from the other end in the baking chamber 1 to one end, and then enters the other guiding box 11 again, thereby realizing the circular rotation of the heat insulation belt 9. On the one hand, the arc-shaped guiding box 11 ensures the installation and use of the driving group 3 in this area. On the other hand, through the sealing and isolation of the guiding box 11, heat preservation and protection are carried out on the heat insulation belt 9 rotated to the outside of the baking chamber 1, avoiding a large amount of heat loss of the heat insulation belt 9, resulting in energy waste, and avoiding affecting the operation efficiency of heating and baking the PCB board 4, and also avoiding the pollution of the heat insulation belt 9 and affecting the quality of the PCB board 4 after baking.

[0023] In the present invention, annular chain belts 10 are fixed to both the top end and the bottom end inside the heat insulation belt 9. The inner wall of the guiding box 11 is adapted to the heat insulation belt 9 and the chain belt 10. The chain belt 10 located below is drivingly connected with a rotating mechanism. Sprockets two 13 are rotatably arranged at the four corner positions of the upper shelf plate 7. The sprockets two 13 are located below the upper shelf plate 7. Sprockets three 14 are rotatably arranged at the four corner positions of the lower shelf plate 8. The sprockets three 14 are located above the lower shelf plate 8. The sprockets two 13 and the sprockets three 14 are meshed with the chain belt 10 to support the chain belt 10 and the heat insulation belt 9 through the sprockets two 13 and the sprockets three 14 distributed up and down at the four corner positions, and to limit the sliding of the heat insulation belt 9 through the guiding boxes 11 at both ends, so as to maintain the stability of the heat insulation belt 9 in the rotating state and the heat insulation stability on both sides of the baking chamber 1.

[0024] In the present invention, the rotating mechanism is provided with a rotating motor 15 installed at the middle position of the bottom of the lower shelf plate 8. The output shaft of the rotating motor 15 extends above the lower shelf plate 8. A turntable 17 is fixed to the output shaft of the rotating motor 15. A toothed ring 16 is installed on the outer wall of the turntable 17. The toothed ring 16 is meshed with the sprocket three 14. Thus, by rotating the toothed ring 16 by the rotating motor 15, the sprocket three 14 is driven to rotate to drive the chain belt 10 and the heat insulation belt 9 to rotate, thereby realizing the stable rotation of the heat insulation belt 9. And the rotation of the heat insulation belt 9 will drive the sprocket two 13 above to rotate. During the baking operation, the sprockets two 13 and the sprockets three 14 at the four corner positions can rotate, and rotate at the four corner positions of the chamber surrounded by the upper shelf plate 7, the lower shelf plate 8 and the heat insulation belt 9 to induce air flow, cooperate with the rotation of the turntable 17 and the movement of the heat insulation belt 9 in the direction perpendicular to the conveying direction, so as to evenly disperse the baking air flow, quickly increase the temperature and make the temperature distribution uniform, so as to improve the baking operation efficiency.

[0025] In the present invention, the guiding box 11 is provided with an inner plate 111 and an outer plate 112. The inner plate 111 is located inside the heat insulation belt 9, and the outer plate 112 is located outside the heat insulation belt 9. Sealing plates 113 are installed at both the top and bottom between the inner plate 111 and the outer plate 112. The inner side of the heat insulation belt 9 is in sliding fit with the inner plate 111, the outer side of the heat insulation belt 9 is in sliding fit with the outer plate 112, and the top and bottom of the heat insulation belt 9 are in sliding fit with the sealing plates 113. Installation parts 114 are provided at both the top and bottom positions of the inner plate 111. The installation parts 114 are arranged in an arc structure arched towards the inside of the baking chamber 1. A first sprocket 12 is rotatably arranged at the position of the installation part 114. The first sprocket 12 meshes with the chain belt 10. Through the meshing of the first sprocket 12 with the chain belt 10 outside the baking chamber 1, and the sliding fit of the inner plate 111 and the outer plate 112 with the inner and outer sides of the heat insulation belt 9, the stability of the movement of the heat insulation belt 9 outside the baking chamber 1 is ensured, so as to ensure the effectiveness of the tensioning movement of the heat insulation belt 9, and the dismountable setting of the inner plate 111, the outer plate 112 and the sealing plates 113 facilitates the disassembly, replacement or cleaning of the heat insulation belt 9.

[0026] In the present invention, a plurality of groups of grooves 171 are formed at the top of the turntable 17. Each group of grooves 171 is distributed in a circumferential direction of the turntable 17 in an annular array, and the plurality of groups of grooves 171 are staggered. The depth of the grooves 171 gradually decreases in a direction away from the center of the turntable 17. Thus, during the rotation of the turntable 17 with the toothed ring 16, a part of the air flow located below the conveying roller 2 is upwardly diverted through the grooves 171 with variable depth, and the plurality of groups of grooves 171 are staggered, so that the air flow is dispersed upward. Cooperating with the movement of the second sprocket 13, the third sprocket 14 and the heat insulation belt 9, the hot air flow is quickly dispersed to improve the heating efficiency and the baking operation efficiency.

[0027] Example 2: Refer to Figures 1-10, a baking device for PCB board processing. On the basis of Embodiment 1, a plurality of air guiding mechanisms 19 are arranged in the middle of the heat insulation zone 9 in the baking chamber 1. The air guiding mechanisms 19 are located between two adjacent conveying rollers 2. It should be noted that one air guiding mechanism 19 is arranged between two adjacent conveying rollers 2, and the air guiding mechanism 19 is located below the outer wall of the top of the conveying roller 2. The air guiding mechanism 19 is provided with a fixing rod 191 fixed to the inner wall of the baking chamber 1. The fixing rod 191 is arranged parallel to the conveying roller 2. Both ends of the outer wall of the fixing rod 191 are rotatably connected with a rotating sleeve 192 through a torsion spring. Both sides of the rotating sleeve 192 are fixed with blades 193. The blades 193 between two rotating sleeves 192 on the same fixing rod 191 are arranged at intervals and staggered in the circumferential direction. The blades 193 fixed on the rotating sleeve 192 extend towards the direction of the other rotating sleeve 192, and the blades 193 fixed on the rotating sleeve 192 do not contact the outer wall of the other rotating sleeve 192. A magnetic block 18 is installed on the top of the turntable 17. There is magnetic adsorption between the magnetic block 18 and the blades 193 below the fixing rod 191. When the turntable 17 rotates, the magnetic block 18 on the turntable 17 moves in the circumferential direction, so that the magnetic block 18 alternately approaches the blades 193 corresponding to different air guiding mechanisms 19. When the magnetic block 18 approaches the two blades 193 below the fixing rod 191, the two blades 193 below the fixing rod 191 close and drive the two blades 193 above to close. When the magnetic block 18 moves away, the adjacent two blades 193 open under the action of the torsion spring, so that the two blades 193 above the fixing rod 191 between two adjacent conveying rollers 2 open and close reciprocally, so as to guide the air flow movement below the PCB board body 4, and improve the heating and baking temperature rising efficiency and the baking operation efficiency around the PCB board body 4.

[0028] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent replacements or changes, and should be covered by the protection scope of the present invention.

Claims

1. A baking device for PCB board processing, comprising a baking chamber (1) with openings on both sides, in which a plurality of conveying rollers (2) are rotatably arranged, and the ends of the conveying rollers (2) are connected with a driving group (3), characterized in that, A plurality of heating tubes (6) are arranged at the middle position of the baking chamber (1). The heating tubes (6) are located above the conveying rollers (2). An upper shelf plate (7) is installed above the heating tubes (6) inside the baking chamber (1). A lower shelf plate (8) is installed below the conveying rollers (2) inside the baking chamber (1). A heat insulation belt (9) with an annular structure is rotatably arranged between the upper shelf plate (7) and the lower shelf plate (8). Two symmetrically distributed notches (901) are formed on the outer wall of the heat insulation belt (9). The heat insulation belt (9) moves at both sides between the upper shelf plate (7) and the lower shelf plate (8).

2. The baking device for PCB board processing according to claim 1, characterized in that, Guide boxes (11) are installed at both ends of the baking chamber (1). The guide boxes (11) are arranged in an arc-shaped structure that arches away from the baking chamber (1).

3. The baking device for PCB board processing according to claim 2, wherein, Ring-shaped chain belts (10) are fixed to both the top end and the bottom end inside the heat insulation belt (9). The chain belt (10) located below is drivingly connected to a rotating mechanism.

4. A baking device for PCB board processing according to claim 3, characterized in that, Sprockets two (13) are rotatably arranged at the four corner positions of the upper shelf plate (7). Sprockets three (14) are rotatably arranged at the four corner positions of the lower shelf plate (8). The sprockets two (13) and the sprockets three (14) are meshed with the chain belts (10).

5. The baking device for PCB board processing according to claim 4, characterized in that, The rotating mechanism is provided with a rotating motor (15) installed at the middle position of the bottom of the lower shelf plate (8). The output shaft of the rotating motor (15) extends above the lower shelf plate (8). A turntable (17) is fixed to the output shaft of the rotating motor (15). A toothed ring (16) is installed on the outer wall of the turntable (17). The toothed ring (16) is meshed with the sprocket three (14).

6. A baking device for PCB board processing according to any one of claims 3 to 5, characterized in that, The guide box (11) is provided with an inner plate (111) and an outer plate (112). The inner plate (111) is located inside the heat insulation belt (9). The outer plate (112) is located outside the heat insulation belt (9). Sealing plates (113) are installed at both the top end and the bottom end between the inner plate (111) and the outer plate (112).

7. The baking device for PCB board processing according to claim 6, characterized in that, Installation parts (114) are arranged at both the top and bottom positions of the inner plate (111). The installation parts (114) are arranged in an arc-shaped structure that arches into the baking chamber (1). Sprockets one (12) are rotatably arranged at the installation parts (114). The sprockets one (12) are meshed with the chain belts (10).

8. A baking device for PCB board processing according to claim 5, characterized in that, A plurality of groups of grooves (171) are formed on the top of the turntable (17). Each group of grooves (171) is distributed in an annular array in the circumferential direction of the turntable (17). And the multiple groups of grooves (171) are staggered. The depth of the grooves (171) gradually decreases in the direction away from the center of the turntable (17).

9. A baking device for PCB board processing according to claim 5, characterized in that, A plurality of air guiding mechanisms (19) are arranged in the middle of the heat insulation belt (9) inside the baking chamber (1). The air guiding mechanisms (19) are located between two adjacent conveying rollers (2). The air guiding mechanisms (19) are located below the outer wall of the top of the conveying rollers (2). The air guiding mechanisms (19) are provided with fixing rods (191) fixed to the inner wall of the baking chamber (1). The fixing rods (191) are arranged parallel to the conveying rollers (2). Rotating sleeves (192) are rotatably connected to both ends of the outer wall of the fixing rods (191) through torsion springs. Blades (193) are fixed to both sides of the rotating sleeves (192).

10. A baking device for PCB board processing according to claim 9, characterized in that, The blades (193) located between two rotating sleeves (192) on the same fixed rod (191) are arranged at intervals and staggered in the circumferential direction. The blades (193) fixed on the rotating sleeves (192) extend towards the other rotating sleeve (192). A magnetic block (18) is installed on the top of the turntable (17), and there is magnetic adsorption between the magnetic block (18) and the blade (193) below the fixed rod (191).

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