Plane tunnel furnace for producing single-sided PCB (Printed Circuit Board) and use method of plane tunnel furnace

Abstract

The invention belongs to the technical field of tunnel furnaces, particularly relates to a planar tunnel furnace for producing a single-sided PCB (printed circuit board) and a using method thereof, and provides the following scheme aiming at the problems that in the prior art, when the PCB is directly placed on a conveying belt to be conveyed, the PCB is easy to deviate, and the bottom of the PCB is in contact with the conveying belt in the drying process to cause non-uniform drying. The PCB drying device comprises a bottom frame, a conveyor used for conveying PCBs is arranged in the bottom frame, a pre-drying box used for pre-drying the PCBs is arranged at the top of the bottom frame, a second drying box used for drying the PCBs is arranged at the top of the bottom frame, and a cooling box used for cooling the PCBs is further arranged at the top of the bottom frame; the pre-drying, drying and cooling functions are integrated, so that the production efficiency is remarkably improved. The design of the clamp in the equipment can flexibly adapt to PCBs of different sizes, automatic rotation is achieved through the driving assembly in the conveying process, it is guaranteed that all parts of the PCBs are evenly heated and cooled, and the product quality is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel furnaces, and particularly relates to a planar tunnel furnace for PCB single-sided panel production and its usage method. Background Art

[0002] The PCB circuit board is the base material of electronic circuit products. During its production process, baking treatment is required to remove the internal stress, and this work is completed by a professional baking tunnel furnace. Currently, the tunnel furnace mainly consists of a preheating chamber, a high-temperature baking chamber, a cooling chamber, and a conveyor. The conveyor is responsible for continuously transporting the PCB boards. However, the conveyor inside the existing tunnel furnace cannot effectively fix the PCB boards. Usually, the PCB boards are directly placed on the conveyor belt for transportation. During transportation, the PCB boards are not only prone to deviation, but also their bottoms come into contact with the conveyor belt, resulting in uneven drying. Summary of the Invention

[0003] The purpose of the present invention is to solve the drawbacks in the prior art that the PCB boards are directly placed on the conveyor belt for transportation, and during transportation, they are not only prone to deviation, but also their bottoms come into contact with the conveyor belt during the drying process, resulting in uneven drying. A planar tunnel furnace for PCB single-sided panel production and its usage method are proposed.

[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A planar tunnel furnace for PCB single-sided panel production includes a bottom frame. A conveyor for transporting PCB boards is provided inside the bottom frame. A pre-drying box for pre-drying PCB boards is provided at the top of the bottom frame. A second drying box for drying PCB boards is provided at the top of the bottom frame. A cooling box for cooling PCB boards is also provided at the top of the bottom frame;

[0006] A plurality of clamps for fixing PCB boards are provided on the conveyor belt of the conveyor. A plurality of second protrusions for cooperating with the clamps are provided on one inner wall of each of the pre-drying box, the second drying box, and the cooling box, for driving the PCB boards to rotate;

[0007] The clamp includes a mounting seat fixedly provided on the conveyor belt of the conveyor. A rotating table is rotatably provided on the top of the mounting seat. A fixing strip is fixedly provided on the top of the rotating table. Adjusting strips are slidably provided on both sides of the fixing strip. Two clamping blocks for cooperating with the mounting holes of the PCB boards can be adjusted and provided on the mutually approaching sides of the adjusting strip and the fixing strip;

[0008] A driving assembly is provided below the rotating table and cooperates with the second protrusion for driving the rotating table to rotate;

[0009] The blanking mechanism is arranged inside the fixed strip and is used in cooperation with the driving component to automatically release the fixation of the PCB board after cooling.

[0010] In a possible design, the driving component includes a toothed ring sleeved on the outer wall of the rotating table. A limiting strip corresponding to the rotating table is provided on the conveyor belt of the conveyor. A second sliding rod is slidably arranged through one side of the limiting strip. One end of the second sliding rod is fixedly provided with a fixed seat. One side of the fixed seat is fixedly provided with a first rack engaged with the toothed ring. The other end of the second sliding rod is provided with an extension block for cooperating with the second bump.

[0011] In a possible design, two first guide rods are slidably arranged through one side of the limiting strip. The outer ends of the two first guide rods are fixedly provided with the same moving seat. The moving seat is fixedly sleeved on the outer wall of the second sliding rod. A first spring is sleeved on the outer wall of the first guide rod. The two ends of the first spring are respectively fixedly connected to the mutually close sides of the moving seat and the limiting strip for driving the first rack to move back to its original position. The toothed ring is sleeved on the rotating table through a one-way bearing.

[0012] In a possible design, guide rails are fixedly provided on both sides of the fixed strip. The adjusting strip is slidably sleeved on the guide rails. A first bolt is arranged through the top of the adjusting strip. The bottom end of the first bolt abuts against the guide rail for fixing the adjusting strip.

[0013] In a possible design, the clamping block includes a threaded column. One end of the threaded column is fixedly provided with a connecting cylinder. A sliding column is slidably arranged inside the connecting cylinder. The outer end of the sliding column is provided with a conical head adapted to the mounting hole of the PCB board. A third spring is arranged inside the connecting cylinder. The two ends of the third spring are respectively fixedly connected to one side of the sliding column and one side inner wall of the connecting cylinder for clamping the PCB board.

[0014] In a possible design, balls are embedded at the outer end of the conical head to reduce the friction with the PCB board.

[0015] In a possible design, a plurality of threaded holes are formed on the mutually close sides of the fixed strip and the adjusting strip. The threaded column is threadedly arranged in the corresponding threaded hole.

[0016] In a possible design, the blanking mechanism includes two first sliding rods slidably arranged through both ends of the fixed bar. One of the first sliding rods is used in cooperation with the extension block to drive the first sliding rod to move within the fixed bar. A first convex block used in cooperation with the extension block is fixedly arranged at the top of the discharge end of the bottom frame. A sleeve rod is slidably sleeved on the outer wall of the second sliding rod. The sleeve rod is fixedly arranged at the bottom of the extension block. A second spring is arranged inside the sleeve rod. Two ends of the second spring are respectively fixedly connected to one inner wall of the sleeve rod and one end of the second sliding rod. An adjusting block is slidably sleeved on the outer wall of the first sliding rod. A second bolt is threadedly arranged through the top of the adjusting block. The bottom of the second bolt abuts against the first sliding rod. Two wedge bars are fixedly arranged on one side of the adjusting block. The wedge bars are located between the fixed bar and the adjusting bar. The two first sliding rods are connected by a transmission member to drive the two first sliding rods to move relative to each other, so as to drive the PCB board to disengage from the two groups of clamping blocks.

[0017] In a possible design, the transmission member includes a gear rotatably arranged inside the fixed bar. Both ends of the two first sliding rods close to each other are fixedly provided with second racks meshing with the gear. The two second racks are respectively located above and below the gear. A fixed block is fixedly arranged on the inner wall of the fixed bar. A second guide rod is slidably arranged through one side of the fixed block. A fourth spring is sleeved on the outer wall of the second guide rod. Two ends of the fourth spring are respectively fixedly connected to the sides of the first sliding rod and the fixed block close to each other, so as to drive the first sliding rod to move back to its original position.

[0018] A method for using a planar tunnel furnace for PCB single-sided panel production includes the following steps:

[0019] S1. First, insert the PCB board on the fixture, start the conveyor for conveying, and at the same time start the pre-drying box for pre-drying, the second drying box for drying, and the cooling box for cooling;

[0020] S2. When the extension block contacts the second convex block, drive the PCB board to rotate and dry while rotating;

[0021] S3. When the extension block contacts the first convex block, it can drive the PCB board to rotate back to its original position again, drive the wedge bar to move, and automatically disengage the PCB board from the conical head;

[0022] S4. Finally, manually remove the disengaged PCB board for storage.

[0023] Beneficial effects: In the present invention, for the planar tunnel furnace used in the production of PCB single-sided panels, by integrating the pre-drying box, the second drying box and the cooling box on the top of the bottom frame, a complete production line for PCB boards is formed, greatly improving the production efficiency. At the same time, the fixture design on the conveyor ensures that the PCB board can be firmly fixed during transportation, avoiding damage or position deviation caused by movement.

[0024] In the present invention, for the planar tunnel furnace used in the production of PCB single-sided panels, through the design of the rotating table and the driving component in the fixture, when the PCB board enters the pre-drying box, the second drying box and the cooling box, it can rotate automatically, thereby ensuring that all parts of the PCB board can be evenly processed, improving the product quality. In addition, by adjusting the positions of the adjusting strip and the clamping block, PCB boards of different sizes can be adapted, increasing the versatility and flexibility of the equipment.

[0025] In the present invention, for the planar tunnel furnace used in the production of PCB single-sided panels, through the cooperation of the sliding column and the conical head, and the elastic force of the third spring, the clamping of the PCB board can be achieved, which not only ensures the stability of the fixation, but also avoids damage to the PCB board caused by excessive clamping force. At the same time, the ball design at the outer end of the conical head further reduces the friction with the PCB board, protects the surface of the PCB board, and can effectively reduce the contact area with the PCB board.

[0026] In the present invention, for the planar tunnel furnace used in the production of PCB single-sided panels, through the cooperation of the extension block and the first convex block, and the interaction of the first sliding rod, the adjusting block and the wedge bar, the fixation of the PCB board can be automatically released after cooling and it can be smoothly sent out, greatly saving the labor cost and improving the production efficiency. At the same time, the design of the transmission part and the reset spring enables the blanking mechanism to work stably and reliably, ensuring the continuity and stability of production.

[0027] In the present invention, by integrating the functions of pre-drying, drying and cooling into one, the production efficiency is significantly improved. The fixture design in the equipment can flexibly adapt to PCB boards of different sizes, and can rotate automatically through the driving component during transportation to ensure that all parts of the PCB board are evenly heated and cooled, improving the product quality. In addition, the automatic design of the blanking mechanism can automatically release the fixation of the PCB board after cooling and smoothly send it out, further saving the labor cost. Brief Description of the Drawings

[0028] Figure 1 It is a three-dimensional structural schematic diagram of a planar tunnel furnace for the production of PCB single-sided panels proposed by the present invention;

[0029] Figure 2A three-dimensional structure schematic diagram of another perspective of a planar tunnel furnace for PCB single-sided panel production proposed by the present invention;

[0030] Figure 3 A structural schematic diagram of a clamping mechanism of a planar tunnel furnace for PCB single-sided panel production proposed by the present invention;

[0031] Figure 4 A structural schematic diagram of the connection between a rotating table and a mounting seat of a planar tunnel furnace for PCB single-sided panel production proposed by the present invention;

[0032] Figure 5 A structural schematic diagram of the installation of a fixing bar and an adjusting bar of a planar tunnel furnace for PCB single-sided panel production proposed by the present invention;

[0033] Figure 6 A sectional structural schematic diagram of a clamping block of a planar tunnel furnace for PCB single-sided panel production proposed by the present invention;

[0034] Figure 7 A sectional structural schematic diagram of a fixing bar of a planar tunnel furnace for PCB single-sided panel production proposed by the present invention;

[0035] Figure 8 A structural schematic diagram of the installation of a convex block of a planar tunnel furnace for PCB single-sided panel production proposed by the present invention.

[0036] In the figure: 1, bottom frame; 2, conveyor; 3, fixture; 4, pre-drying box; 5, second drying box; 6, cooling box; 7, first convex block; 8, rotating table; 9, fixing bar; 10, adjusting bar; 11, guide rail; 12, first bolt; 13, first sliding rod; 14, wedge bar; 15, sleeve rod; 16, extension block; 17, mounting seat; 18, toothed ring; 19, first rack; 20, fixed seat; 21, limiting bar; 22, first guide rod; 23, moving seat; 24, first spring; 25, second sliding rod; 26, second spring; 27, adjusting block; 28, second bolt; 29, threaded hole; 30, clamping block; 31, threaded column; 32, connecting cylinder; 33, third spring; 34, sliding column; 35, conical head; 36, ball; 37, gear; 38, second rack; 39, fixed block; 40, second guide rod; 41, fourth spring; 42, second convex block. Detailed implementation manners

[0037] 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.

[0038] Example 1: Refer to Figures 1 - 8, a tunnel furnace, comprising: a bottom frame 1, within which a conveyor 2 is arranged for conveying PCB boards. On the top of the bottom frame 1, a pre-drying box 4, a second drying box 5 and a cooling box 6 are successively arranged for pre-drying, drying and cooling the PCB boards respectively.

[0039] On the conveyor belt of the conveyor 2, a plurality of jigs 3 are arranged for fixing the PCB boards. Each jig 3 includes a mounting seat 17 fixed on the conveyor belt. A rotating table 8 is rotatably arranged on the top of the mounting seat 17. A fixing bar 9 is fixed on the top of the rotating table 8. Adjusting bars 10 are slidably arranged on both sides of the fixing bar 9. Clamping blocks 30 are adjustably arranged on the mutually approaching sides of the adjusting bars 10 and the fixing bar 9 for clamping the mounting holes on the PCB boards.

[0040] In order to realize the rotation of the rotating table 8, a driving assembly is provided. The driving assembly includes a toothed ring 18 sleeved on the outer wall of the rotating table 8. A limiting bar 21 corresponding to the rotating table 8 is arranged on the conveyor belt of the conveyor 2. A second sliding rod 25 is slidably arranged through one side of the limiting bar 21. One end of the second sliding rod 25 is fixed with a fixing seat 20. A first rack 19 meshing with the toothed ring 18 is fixed on one side of the fixing seat 20. An extension block 16 is arranged at the other end of the second sliding rod 25. When the extension block 16 contacts the second convex blocks 42 in the pre-drying box 4, the second drying box 5 and the cooling box 6, it will push the second sliding rod 25 to move, and then drive the toothed ring 18 and the rotating table 8 to rotate through the first rack 19.

[0041] In order to ensure the reset movement of the first rack 19, two first guide rods 22 are also slidably arranged through one side of the limiting bar 21. The outer ends of the two first guide rods 22 are fixed with the same moving seat 23. The moving seat 23 is fixedly sleeved on the outer wall of the second sliding rod 25. A first spring 24 is sleeved on the outer wall of the first guide rod 22. The two ends of the first spring 24 are respectively fixedly connected with the mutually approaching sides of the moving seat 23 and the limiting bar 21. At the same time, the toothed ring 18 is sleeved on the rotating table 8 through a one-way bearing to ensure that the rotating table 8 can only rotate in one direction.

[0042] In order to realize the automatic blanking of the PCB boards, a blanking mechanism is provided. The blanking mechanism includes two first sliding rods 13 slidably arranged through both ends of the fixing bar 9. One of the first sliding rods 13 is used in cooperation with the extension block 16 for driving the first sliding rod 13 to move within the fixing bar 9 when the extension block 16 moves. A first convex block 7 used in cooperation with the extension block 16 is fixedly arranged on the top of the discharge end of the bottom frame 1. When the extension block 16 contacts the first convex block 7, it will push the first sliding rod 13 to move.

[0043] The outer wall of the second sliding rod 25 is slidably sleeved with a sleeve rod 15, which is fixedly mounted on the bottom of the extension block 16. A second spring 26 is disposed within the sleeve rod 15, with both ends of the second spring 26 fixedly connected to one inner wall of the sleeve rod 15 and one end of the second sliding rod 25, respectively, to provide a restoring force for the sleeve rod 15, allowing the extension block 16 to move a second time.

[0044] An adjustment block 27 is slidably mounted on the outer wall of the first sliding rod 13. A second bolt 28 is threaded through the top of the adjustment block 27. The bottom of the second bolt 28 abuts against the first sliding rod 13, securing the adjustment block 27. Two wedges 14 are fixed to one side of the adjustment block 27, located between the fixing bar 9 and the adjustment bar 10. When the first sliding rod 13 moves, it drives the adjustment block 27 and the wedges 14, pushing the PCB upward and freeing it from the two clamping blocks 30, enabling automatic unloading of the PCB.

[0045] The present application can be used in the field of tunnel furnaces, and can also be used in other fields applicable to the present application.

[0046] Example 2: Reference Figures 1 - 8 , based on the improvement of Example 1: A flat tunnel furnace for PCB single-sided board production, which is applied to the field of tunnel furnaces, wherein an adjustment bar 10 is slidably mounted on guide rails 11 on both sides of a fixed bar 9 for adjustment. A first bolt 12 is provided through the top of the adjustment bar 10, and the bottom end of the first bolt 12 contacts the guide rail 11 to fix the adjustment bar 10.

[0047] The clamping block 30 comprises a threaded post 31, one end of which is fixed to a connecting tube 32. A sliding post 34 slides within the connecting tube 32. The outer end of the sliding post 34 is equipped with a tapered head 35 that fits into the mounting hole of the PCB. A third spring 33 is mounted within the connecting tube 32. Its two ends are fixedly connected to one side of the sliding post 34 and the inner wall of the connecting tube 32, respectively, to clamp the PCB. To reduce friction with the PCB, a ball bearing 36 is embedded in the outer end of the tapered head 35.

[0048] A plurality of threaded holes 29 are provided on the sides of the fixing bar 9 and the adjusting bar 10 that are close to each other. The threaded columns 31 are threadedly provided in the corresponding threaded holes 29 to facilitate adjustment of the position of the clamping block 30 .

[0049] The two first sliding rods 13 are connected by a transmission member to ensure that the two first sliding rods 13 can move simultaneously. The transmission member includes a gear 37 rotatably arranged in the fixed strip 9. A second rack 38 meshing with the gear 37 is fixed to each of the mutually approaching ends of the two first sliding rods 13. The two second racks 38 are respectively located above and below the gear 37. A fixed block 39 is fixedly arranged on the inner wall of the fixed strip 9. A second guide rod 40 is slidably arranged through one side of the fixed block 39. A fourth spring 41 is sleeved on the outer wall of the second guide rod 40. The two ends of the fourth spring 41 are respectively fixedly connected to the mutually approaching sides of the first sliding rod 13 and the fixed block 39, and are used to provide a reset force for the first sliding rod 13.

[0050] A method for using a planar tunnel furnace for PCB single-sided panel production includes the following steps:

[0051] S1. First, insert the PCB board on the fixture 3, start the conveyor 2 for conveying, and at the same time start the pre-drying box 4 for pre-drying, the second drying box 5 for drying, and the cooling box 6 for cooling;

[0052] S2. When the extension block 16 contacts the second convex block 42, drive the PCB board to rotate and dry while rotating;

[0053] S3. When the extension block 16 contacts the first convex block 7, it can drive the PCB board to rotate back again, drive the wedge 14 to move, and automatically separate the PCB board from the conical head 35;

[0054] S4. Finally, manually remove the separated PCB board and store it.

[0055] In this embodiment, first, the threaded post 31 is selectively screwed into the corresponding threaded hole 29 according to the position of the mounting hole on the PCB board, and then the PCB board is inserted on the fixture 3. During the insertion process, the PCB board will squeeze the two sliding columns 34 through the conical head 35, drive the sliding columns 34 to move into the connecting cylinder 32, and compress the third spring 33 during the movement. When the conical head 35 corresponds to the mounting hole, the sliding column 34 can move back under the action of the third spring 33, clamp the PCB board, start the conveyor 2 for conveying, and at the same time start the pre-drying box 4 for pre-drying, the second drying box 5 for drying, and the cooling box 6 for cooling;

[0056] When the extension block 16 contacts the second protrusion 42, the extension block 16 can be driven to move inward through the second protrusion 42, and the movement of the extension block 16 can be moved by the sleeve rod 15. During the movement of the sleeve rod 15, the second sliding rod 25 can be driven inward by the second spring 26. The movement of the second sliding rod 25 can drive the movable seat 23 and the fixed seat 20 to move. The movement of the fixed seat 20 can drive the first rack 19 to move. The movement of the first rack 19 can drive the gear ring 18 to rotate. The rotation of the gear ring 18 can drive the rotating table 8 to rotate through the one-way bearing. The rotation of the rotating table 8 can simultaneously drive the two rotating tables 8 and the fixed bar 9 to rotate, which can drive the PCB to rotate and dry while rotating. When the movable seat 23 moves, it can drive the two first guide rods 22 to slide in the limit bar 21 and compress the first spring 24.

[0057] When the extension block 16 moves away from the second protrusion 42, the movable seat 23 can be reset and moved under the action of the first spring 24, and drive the second sliding rod 25 to reset and move. The reset movement of the second sliding rod 25 can drive the first rack 19 to reset and move through the fixed seat 20. Due to the action of the one-way bearing, the reverse rotation of the gear ring 18 will not drive the rotation of the rotating table 8. At the same time, the sleeve rod 15 and the extension block 16 can be driven to reset and move through the second spring 26.

[0058] When the extension block 16 contacts the first protrusion 7, the cooling is completed and the extension block 16 can be driven to move by the first protrusion 7. The movement of the extension block 16 can drive the rotating table 8 to rotate again, and can drive the rotating table 8 to return to rotation. Since the first protrusion 7 is larger than the second protrusion 42, it can continue to drive the extension block 16 to move. At this time, the movement of the extension block 16 can drive the sleeve rod 15 to slide on the second sliding rod 25 and compress the second spring 26. At the same time, it can also drive the first sliding rod 13 to move through the extension block 16. The movement of the first sliding rod 13 can drive the second guide rod 40 to slide in the fixed block 39 and compress the fourth spring 41. It can also drive the second rack 38 below to move. The movement of the second rack 38 below can drive the second rack 38 above to move in the opposite direction through the gear 37, thereby driving the two first sliding rods 13 to move relative to each other. The movement of the first sliding rod 13 can drive the wedge 14 to move through the adjusting block 27. During the movement of the wedge 14, it can resist the PCB board and move upward until the PCB board is separated from the two sets of clamping blocks 30. The PCB board after separation can automatically fall onto the conveyor belt.

[0059] Continuing to move, when the extension block 16 moves away from the first protrusion 7, the second sliding rod 25 can be reset and moved under the action of the first spring 24, the sleeve rod 15 can be reset and moved under the action of the second spring 26, and the first sliding rod 13 can be reset and moved under the action of the fourth spring 41;

[0060] Finally, the detached PCB board is removed and stored manually.

[0061] However, as is well known to those skilled in the art, the working principles and wiring methods of the conveyor 2, the pre-drying box 4, the second drying box 5, and the cooling box 6 are common knowledge and all belong to conventional means or well-known common sense, so they will not be elaborated here. Those skilled in the art can make arbitrary selections according to their needs or convenience.

[0062] 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 substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A planar tunnel furnace for PCB single-sided panel production, characterized in that, It includes a bottom frame (1), a conveyor (2) for conveying a PCB board is arranged inside the bottom frame (1), a pre-drying box (4) for pre-drying the PCB board is arranged at the top of the bottom frame (1), a second drying box (5) for drying the PCB board is arranged at the top of the bottom frame (1), and a cooling box (6) for cooling the PCB board is also arranged at the top of the bottom frame (1); A plurality of clamps (3) for fixing the PCB board are arranged on the conveyor belt of the conveyor (2), and a plurality of second bumps (42) for cooperating with the clamps (3) are arranged on one inner wall of the pre-drying box (4), the second drying box (5) and the cooling box (6) to drive the PCB board to rotate; The clamp (3) includes a mounting seat (17) fixedly arranged on the conveyor belt of the conveyor (2), a rotating table (8) is rotatably arranged on the top of the mounting seat (17), a fixing strip (9) is fixedly arranged on the top of the rotating table (8), adjusting strips (10) are slidably arranged on both sides of the fixing strip (9), and two clamping blocks (30) for cooperating with the mounting holes of the PCB board are adjustably arranged on the mutually approaching sides of the adjusting strip (10) and the fixing strip (9); A driving assembly is arranged below the rotating table (8) and cooperates with the second bump (42) to drive the rotating table (8) to rotate; A blanking mechanism is arranged in the fixing strip (9) and cooperates with the driving assembly to automatically release the fixation of the PCB board after cooling.

2. A planar tunnel furnace for PCB single-sided panel production according to claim 1, characterized in that, The driving assembly includes a toothed ring (18) sleeved on the outer wall of the rotating table (8), a limiting strip (21) corresponding to the rotating table (8) is arranged on the conveyor belt of the conveyor (2), a second sliding rod (25) is slidably arranged through one side of the limiting strip (21), a fixing seat (20) is fixedly arranged at one end of the second sliding rod (25), a first rack (19) meshing with the toothed ring (18) is fixedly arranged on one side of the fixing seat (20), and an extension block (16) for cooperating with the second bump (42) is arranged at the other end of the second sliding rod (25).

3. The planar tunnel furnace for PCB single-sided panel production according to claim 2, characterized in that, Two first guide rods (22) are slidably arranged through one side of the limiting strip (21), the outer ends of the two first guide rods (22) are fixedly provided with the same moving seat (23), the moving seat (23) is fixedly sleeved on the outer wall of the second sliding rod (25), a first spring (24) is sleeved on the outer wall of the first guide rod (22), and both ends of the first spring (24) are fixedly connected to the mutually approaching sides of the moving seat (23) and the limiting strip (21) to drive the first rack (19) to reset and move, and the toothed ring (18) is sleeved on the rotating table (8) through a one-way bearing.

4. A planar tunnel furnace for PCB single-sided panel production according to claim 1, characterized in that, Guide rails (11) are fixedly arranged on both sides of the fixing strip (9), the adjusting strip (10) is slidably sleeved on the guide rails (11), a first bolt (12) penetrates through the top of the adjusting strip (10), and the bottom end of the first bolt (12) abuts against the guide rail (11) to fix the adjusting strip (10).

5. A planar tunnel furnace for PCB single-sided panel production according to claim 1, characterized in that, The clamping block (30) includes a threaded post (31). One end of the threaded post (31) is fixedly provided with a connecting cylinder (32). A sliding post (34) is slidably arranged in the connecting cylinder (32). The outer end of the sliding post (34) is provided with a tapered head (35) adapted to the mounting hole of the PCB board. A third spring (33) is arranged in the connecting cylinder (32). The two ends of the third spring (33) are respectively fixedly connected to one side of the sliding post (34) and one side inner wall of the connecting cylinder (32) for clamping the PCB board.

6. A planar tunnel furnace for PCB single-sided panel production according to claim 5, characterized in that, A ball (36) is embedded at the outer end of the tapered head (35) to reduce the friction with the PCB board.

7. A planar tunnel furnace for PCB single-sided panel production according to claim 5, characterized in that, A plurality of threaded holes (29) are formed on the mutually approaching sides of the fixed strip (9) and the adjusting strip (10). The threaded post (31) is threadedly arranged in the corresponding threaded hole (29).

8. A planar tunnel furnace for PCB single-sided panel production according to claim 2, characterized in that, The blanking mechanism includes two first sliding rods (13) slidably arranged through both ends of the fixed strip (9). One of the first sliding rods (13) is used in cooperation with the extension block (16) to drive the first sliding rod (13) to move in the fixed strip (9). A first convex block (7) used in cooperation with the extension block (16) is fixedly arranged at the top of the discharge end of the bottom frame (1). A sleeve rod (15) is slidably sleeved on the outer wall of the second sliding rod (25). The sleeve rod (15) is fixedly arranged at the bottom of the extension block (16). A second spring (26) is arranged in the sleeve rod (15). The two ends of the second spring (26) are respectively fixedly connected to one side inner wall of the sleeve rod (15) and one end of the second sliding rod (25). An adjusting block (27) is slidably sleeved on the outer wall of the first sliding rod (13). A second bolt (28) is threadedly arranged through the top of the adjusting block (27). The bottom of the second bolt (28) abuts against the first sliding rod (13). Two wedge strips (14) are fixedly arranged on one side of the adjusting block (27). The wedge strips (14) are located between the fixed strip (9) and the adjusting strip (10). The two first sliding rods (13) are connected by a transmission member to drive the two first sliding rods (13) to move towards each other to drive the PCB board to disengage from the two groups of clamping blocks (30).

9. A planar tunnel furnace for PCB single-sided panel production according to claim 8, characterized in that, The transmission member includes a gear (37) rotatably arranged in the fixed strip (9). Second racks (38) meshing with the gear (37) are fixedly arranged at the mutually approaching ends of the two first sliding rods (13). The two second racks (38) are respectively located above and below the gear (37). A fixed block (39) is fixedly arranged on the inner wall of the fixed strip (9). A second guide rod (40) is slidably arranged through one side of the fixed block (39). A fourth spring (41) is sleeved on the outer wall of the second guide rod (40). The two ends of the fourth spring (41) are respectively fixedly connected to the mutually approaching sides of the first sliding rod (13) and the fixed block (39) to drive the first sliding rod (13) to reset and move.

10. A method for using a planar tunnel furnace for PCB single-sided panel production according to any one of claims 1-9, characterized in that, Including the following steps: S1. First, insert the PCB board onto the fixture (3), start the conveyor (2) for conveying, and at the same time start the pre-drying oven (4) for pre-drying, the second drying oven (5) for drying, and the cooling box (6) for cooling; S2. When the extension block (16) contacts the second convex block (42), it drives the PCB board to rotate and dry while rotating; S3. When the extension block (16) contacts the first convex block (7), it can drive the PCB board to rotate back again and drive the wedge bar (14) to move, automatically disengaging the PCB board from the conical head (35); S4. Finally, manually remove the disengaged PCB board for storage.

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