Reflow soldering machine for PCB (printed circuit board) soldering

Abstract

The invention relates to a reflow soldering machine for PCB welding, and relates to the field of reflow soldering machines, the reflow soldering machine comprises a machine body, a conveying mechanism is arranged in the machine body, the conveying mechanism comprises a conveying belt used for conveying a circuit board, the conveying belt is of a hollow structure, and a plurality of suction holes are formed in the surface of the outer ring of the conveying belt; suction holes are formed in the conveying mechanism, a suction cup used for sucking the circuit board is fixed in each suction hole, the bottom end of each suction cup is fixedly connected with an air pipe, each air pipe is located in the conveying belt, one end of each air pipe penetrates through the side wall of the conveying belt and extends out of the conveying belt, and an air exhaust mechanism used for exhausting air from each air pipe is arranged on one side of the conveying mechanism. The circuit board limiting device has the effect of limiting circuit boards of different sizes.

Description

Technical Field

[0001] The present application relates to the field of reflow soldering machines, and in particular to a reflow soldering machine for soldering PCB circuit boards. Background Art

[0002] Reflow soldering machine, also called reflow soldering machine or "reflow oven", is a device that provides a heating environment to melt the solder paste so that surface mount components and PCB pads can be reliably combined together through the solder paste alloy.

[0003] Apply an appropriate amount of solder paste in an appropriate form to the pads of the circuit board in advance, and then place the components in the corresponding positions. The solder paste has a certain viscosity to fix the components. Then let the circuit board with the components mounted enter the reflow oven. There is a heating circuit inside the equipment, which heats the air or nitrogen to a high enough temperature and blows it towards the circuit board with the components mounted, so that the solder on both sides of the components melts and bonds to the circuit board.

[0004] In order to reduce the displacement of the circuit board under the influence of wind after entering the reflow soldering machine, a limiting mechanism is usually provided in the reflow soldering machine to clamp and limit the circuit board. However, the limiting mechanism in the related art can only limit the circuit board of a specific size. Summary of the Invention

[0005] In order to limit the positioning of circuit boards of different sizes, the present application provides a reflow soldering machine for PCB circuit boards.

[0006] The present application provides a reflow soldering machine for PCB circuit board soldering that adopts the following technical solution: A reflow soldering machine for PCB circuit board soldering comprises a machine body, wherein a conveying mechanism is provided in the machine body, wherein the conveying mechanism comprises a conveyor belt for conveying circuit boards, wherein the conveyor belt is a hollow structure, wherein a plurality of suction holes are provided on the outer ring surface of the conveyor belt, wherein a suction cup for adsorbing the circuit board is fixed in each suction hole, wherein the bottom end of each suction cup is fixedly connected to an air pipe, wherein each air pipe is located inside the conveyor belt, wherein one end of the air pipe passes through the side wall of the conveyor belt and extends out from the conveyor belt, and an exhaust mechanism for exhausting air from each air pipe is provided on one side of the conveying mechanism.

[0007] By adopting this technical solution, after the circuit boards are placed on the conveyor belt, each circuit board is placed on a corresponding suction cup. The air extraction mechanism then evacuates each air pipe, creating a negative pressure in each pipe. The suction cups then absorb the circuit boards, securing them to the conveyor belt. The suction cups can easily absorb and position circuit boards of varying sizes.

[0008] Preferably, the exhaust mechanism includes a hollow transition box, an annular hole is opened on the circumferential side of the transition box, a transmission belt is rotatably connected in the annular hole to seal the annular hole, a support column is fixedly connected between the upper end and the bottom end of the transition box, a driving mechanism for driving the transmission belt to rotate is connected to the transition box, an exhaust fan is connected to the transition box, and the transmission belt is fixedly connected with telescopic tubes equal in number to the air pipes, each telescopic tube on the side of the transmission belt close to the conveyor belt is plugged into each air pipe on the upper side of the conveyor belt, and each telescopic tube is connected to an adjustment component that drives the telescopic tube to extend and is plugged into the corresponding air pipe.

[0009] By adopting the above technical solution, the exhaust fan is activated, and the transition box now draws air from the interior of the machine body, facilitating the exhaust of exhaust gases. Furthermore, as the conveyor belt rotates, the drive mechanism drives the transmission belt, which in turn drives each telescopic tube. The adjustment assembly causes each telescopic tube on the side of the transmission belt closest to the conveyor belt to extend, and each telescopic tube on the side of the transmission belt close to the conveyor belt connects with each air pipe on the upper side of the conveyor belt. This allows each suction cup on the upper side of the conveyor belt to absorb the corresponding circuit board. As the conveyor belt transports the circuit boards, the belt also rotates, ensuring that the conveyor belt's transport of the circuit boards is not affected.

[0010] Preferably, the telescopic tube includes a sleeve connected to the transmission belt, and a sleeve that is sleeved and slidably connected to the sleeve, a telescopic spring is installed between the sleeve and the sleeve, and the adjustment assembly includes a magnet ring 1 fixedly connected to the end of the sleeve away from the transmission belt, and also includes a magnet ring 2 sleeved and fixed on the outside of the trachea, the magnet ring 1 and the magnet ring 2 are attracted to each other and the sleeve is sleeved on the outside of the trachea.

[0011] By adopting this technical solution, when each telescopic tube is rotated to align with the corresponding air tube, magnet ring 1 is attracted by magnet ring 2 and moves toward the air tube until magnet ring 1 and magnet ring 2 attract each other, completing the connection between the sleeve and the air tube. When the transmission belt and conveyor belt drive the shrink tube and the air tube away from each other, magnet ring 1 and magnet ring 2 separate from each other, and the telescopic tube and the air tube automatically separate.

[0012] Preferably, the air tube gradually contracts and becomes a pointed end in a direction away from the conveyor belt.

[0013] By adopting the above technical solution, the sleeve can be easily sleeved on the outside of the trachea, and the connection between the sleeve and the trachea can be completed smoothly.

[0014] Preferably, the sleeve is fixedly connected to an end thereof close to the transmission belt with a regulating plate, the regulating plate is fixedly connected to a side wall thereof close to the transmission belt with a slider, the outer side wall of the transmission belt is provided with a number of slide grooves equal to the number of slide grooves, the slider is slidably plugged into the slide grooves, a regulating spring is fixedly connected between one side wall of the slider and one side wall of the slide groove, the regulating plate is provided with a connecting hole 1 connected to the sleeve, and the transmission belt is provided with a connecting hole 2 aligned with the connecting hole 1.

[0015] By adopting the above technical solution, when there is a slight difference in the rotation speed of the conveyor belt and the transmission belt, the telescopic tube can move left and right, and then drive the corresponding air pipe to complete the connection under the mutual attraction force of the magnetic ring 1 and the magnetic ring 2.

[0016] Preferably, the machine body includes a welding zone and a cooling zone, and both the welding zone and the cooling zone are provided with a conveying mechanism, the two conveying mechanisms are in end-to-end contact with each other, and each conveying mechanism is connected to a corresponding exhaust mechanism.

[0017] By adopting the above technical solution, when the circuit board moves to the welding area, the solder at the solder joints melts so that the components and the circuit board are bonded. The circuit board is then transported to the conveying mechanism in the cooling area, and the solder joints solidify in the cooling area, thus completing the welding.

[0018] Preferably, a heating mechanism is installed in a transition box connected to the conveying mechanism in the welding zone, and a cooling mechanism is installed in a transition box connected to the conveying mechanism in the cooling zone.

[0019] By adopting the above technical solution, when the conveying mechanism in the welding zone conveys the circuit board, the air in the suction cup is hot air, and the suction cup absorbs the circuit board to achieve a preheating effect. The air in the suction cup in the cooling zone is cold air, and the suction cup absorbs the circuit board to achieve a precooling effect.

[0020] Preferably, the driving mechanism includes a gear rotatably connected to the inside of the transition box, the inner surface wall of the transmission belt is provided with a plurality of convex teeth, the gear is engaged with the convex teeth, and the transition box is connected to an adjusting motor for driving the gear to rotate.

[0021] By adopting the above technical solution, the regulating motor is started, and the output shaft of the regulating motor rotates to drive the gear to rotate. The rotation of the gear can drive the transmission belt to rotate through the convex teeth, and the operation is simple and convenient.

[0022] In summary, this application includes at least one of the following beneficial technical effects: The suction cup is convenient for adsorbing circuit boards of different sizes and for limiting the position of circuit boards of different sizes; The telescopic tube and the air pipe automatically connect and separate with each other; The suction cups in the welding zone adsorb the circuit board to achieve a preheating effect on the circuit board, and the suction cups in the cooling zone adsorb the circuit board to achieve a precooling effect on the circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the overall structure of the reflow soldering machine according to an embodiment of the present application.

[0024] Figure 2 This is a schematic diagram of the internal structure of a reflow soldering machine according to an embodiment of the present application.

[0025] Figure 3 It is a structural diagram of the limiting mechanism according to an embodiment of the present application.

[0026] Figure 4 It is a schematic diagram of the internal structure of the transition box according to an embodiment of the present application.

[0027] Figure 5 It is reflected Figure 4 Enlarged view of point A in the middle.

[0028] Explanation of the accompanying symbols: 1. Machine body; 11. Welding area; 12. Cooling area; 13. Opening; 2. Conveying mechanism; 21. Roller; 22. Conveyor belt; 221. Suction hole; 3. Limiting mechanism; 31. Suction cup; 32. Air pipe; 4. Exhaust mechanism; 41. Transition box; 411. Annular hole; 42. Support column; 43. Transmission belt; 431. Connecting hole 2; 432. Slide; 44. Exhaust fan; 45. Telescopic tube; 451. Sleeve; 452. Sleeve; 453. Telescopic spring; 46. Adjustment assembly; 461. Magnet ring 1; 462. Magnet ring 2; 47. Control assembly; 471. Control plate; 4711. Connecting hole 1; 472. Slider; 473. Control spring; 5. Driving mechanism; 51. Gear; 52. Protruding tooth; 53. Adjustment motor. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1-Figure 5 This application is described in further detail.

[0030] The embodiment of the present application discloses a reflow soldering machine for PCB circuit board soldering. Figure 1 and Figure 2 The reflow soldering machine includes a body 1, a welding area 11 and a cooling area 12 are arranged inside the body 1, and both the welding area 11 and the cooling area 12 are provided with a conveying mechanism 2, and the two conveying mechanisms 2 are completely consistent.

[0031] Openings 13 are provided at both ends of the machine body 1. A circuit board is conveyed along one conveyor mechanism 2 into the machine body 1 and into a soldering zone 11. Hot air is blown in from this zone, melting the solder on both sides of the components and bonding them to the circuit board. The circuit board is then transferred along this conveyor mechanism 2 to another conveyor mechanism 2 and into a cooling zone 12. Cool air is blown in this zone, cooling the solder joints and solidifying them, completing the soldering process.

[0032] Reference Figure 2 and Figure 3 Each conveying mechanism 2 includes two rollers 21 rotatably connected to the inside of the body 1 and a conveyor belt 22 installed on the two rollers 21. Each conveying mechanism 2 includes a motor fixedly installed on the body 1, which is coaxially fixed with one of the shafts and is used to drive the shaft to rotate.

[0033] When the conveying mechanism 2 conveys the circuit board, in order to limit the displacement of the circuit board relative to the conveyor belt 22 , each conveying mechanism 2 is connected to a limiting mechanism 3 .

[0034] Each conveyor belt 22 is hollow, and the limiting mechanism 3 includes multiple suction cups 31 disposed within the cavity of the conveyor belt 22. The multiple suction cups 31 are evenly distributed around the circumference of the conveyor belt 22. Each conveyor belt 22 has a plurality of suction holes 221 formed on its outer surface, with one suction cup 31 corresponding to each suction hole 221. The suction cups 31 are inserted into the suction holes 221 and are fixedly connected to the conveyor belt 22. An air pipe 32 is fixedly connected to the end of the suction cup 31 near the inner ring of the transmission belt 43, and the end of the suction cup 31 near the outer ring of the conveyor belt 22 is flush with the outer ring surface of the conveyor belt 22. The air pipe 32 is bent, and the end of the air pipe 32 away from the suction cup 31 passes through a side wall of the conveyor belt 22 and is fixedly connected to the conveyor belt 22.

[0035] Each conveying mechanism 2 is provided on one side with an air extraction mechanism 4 for connecting to each air pipe 32 and extracting air from the air pipe 32. One air extraction mechanism 4 corresponds to one conveying mechanism 2, and one air extraction mechanism 4 is located on one side of the conveying mechanism 2, and the other air extraction mechanism 4 is located on the other side of the other conveying mechanism 2, to reduce the possibility of interference between the two air extraction mechanisms 4.

[0036] As the conveyor belt 22 rotates, each circuit board is placed onto the conveyor belt 22 through the opening 13 near the soldering area 11. Each circuit board is assigned a suction cup 31, with the bottom surface of the circuit board facing the suction cup 31. Simultaneously, the suction mechanism 4 is activated to draw air from each air pipe 32 located above the conveyor belt 22. This allows each suction cup 31 to hold the corresponding circuit board, limiting displacement. The suction cups 31 adhere to the center of the circuit board, so any circuit board larger than the suction cup 31 can be held on the conveyor belt 22.

[0037] The suction cup 31 is made of elastic material and has a flared shape, which makes it easier for the suction cup 31 to absorb the circuit board.

[0038] Reference Figure 3 and Figure 4 The exhaust mechanism 4 includes a transition box 41 fixed within the machine body 1 and arranged along the length of the conveyor mechanism 2. An annular hole 411 is formed around the periphery of the transition box 41, dividing it into an upper and lower portion. Two support columns 42 are fixedly connected to the inner bottom wall of the transition box 41, and the upper surface of each support column 42 is fixedly connected to the inner top wall of the transition box 41. A transmission belt 43 is installed within the annular hole 411, closing the annular hole 411. The transmission belt 43 is rotatably connected to the transition box 41. The transmission belt 43 is connected to the drive mechanism 5 for driving the transmission belt 43 in rotation.

[0039] Reference Figure 4 and Figure 5 , the upper surface of the transition box 41 is equipped with an exhaust fan 44 (see Figure 2 ), one end of the exhaust fan 44 communicates with the interior of the transition box 41, and the other end penetrates the top wall of the machine body 1 and extends outside the machine body 1. Multiple telescopic tubes 45 are mounted on the transmission belt 43, each of which communicates with the interior of the transition box 41. These multiple telescopic tubes 45 are distributed circumferentially around the transmission belt 43. The number of telescopic tubes 45 on the side of the transmission belt 43 near the conveyor mechanism 2 is equal to the number of air pipes 32 located above the conveyor belt 22. Each telescopic tube 45 on the side of the transmission belt 43 near the conveyor mechanism 2 is extended and plugged into one of the air pipes 32 located above the conveyor belt 22. Each telescopic tube 45 is connected to an adjustment assembly 46 that drives the telescopic tube 45 to extend and plug into the air pipe 32.

[0040] During the rotation of the conveyor belt 22, the drive mechanism 5 drives the transmission belt 43 to rotate, keeping the rotation speed of the transmission belt 43 consistent with that of the conveyor belt 22. Each telescopic tube 45 on the side of the transmission belt 43 close to the conveyor belt 22 is extended and connected to each air pipe 32 on the upper side of the corresponding conveyor belt 22, and the exhaust fan 44 is started at the same time (see Figure 2 ), so that each suction cup 31 can absorb a corresponding circuit board.

[0041] Reference Figure 2 and Figure 4 The drive mechanism 5 includes two gears 51 rotatably connected to the interior of the transition box 41. The inner wall of the transmission belt 43 is provided with a plurality of protruding teeth 52, distributed along the circumference of the transmission belt 43. Each gear 51 is located at one end of the transmission belt 43 and meshes with the protruding teeth 52. An adjustment motor 53 is mounted on the outer top wall of the transition box 41. The output shaft of the adjustment motor 53 extends vertically downward through the top wall of the transition box 41 and is coaxially fixed to one of the gears 51.

[0042] The regulating motor 53 is started, and the output shaft of the regulating motor 53 rotates to drive one of the gears 51 to rotate. The rotation of the gear 51 drives the transmission belt 43 to rotate through the plurality of protruding teeth 52 .

[0043] Reference Figure 4 and Figure 5 The telescopic tube 45 includes a sleeve 451 connected to the transmission belt 43. A sleeve 452 is sleeved on one end of the sleeve 451. The sleeve 452 is slidably connected to the sleeve 451. A telescopic spring 453 is sleeved on the outside of the sleeve 451. One end of the telescopic spring 453 is fixedly connected to the sleeve 451, and the other end is fixedly connected to the sleeve 452.

[0044] The adjustment assembly 46 includes a first magnet ring 461 fixed to the end of the sleeve 452 away from the transmission belt 43. Each air tube 32 is fixedly connected to a second magnet ring 462 at the end near the transmission belt 43. The second magnet ring 462 is sleeved on the outside of the air tube 32. The inner diameter of the first magnet ring 461 is larger than the outer diameter of the air tube 32.

[0045] As the conveyor belt 22 and the transmission belt 43 rotate, one of the telescopic tubes 45 and the air pipe 32 located at the end of the welding zone 11 away from the cooling zone 12 gradually approach each other. Thus, the first magnet ring 461 and the second magnet ring 462 gradually approach each other until the first magnet ring 461 and the second magnet ring 462 align with each other. Then, the first magnet ring 461 moves toward the second magnet ring 462 and is attracted to and adheres to the second magnet ring 462. At this point, the sleeve 452 is fitted onto the outside of the air pipe 32, completing the connection between the telescopic tube 45 and the air pipe 32.

[0046] In order to facilitate the sleeve 452 to be sleeved on the outside of the air pipe 32, the air pipe 32 gradually shrinks towards the direction close to the transmission belt 43 to form a pointed end.

[0047] When the air pipe 32 on the upper side of the conveyor belt 22 moves to the end of the welding zone 11 close to the cooling zone 12, the conveyor belt 22 drives the air pipe 32 to gradually move downward until it moves to the lower side of the conveyor belt 22, and the telescopic tube 45 gradually moves away from the conveyor belt 22 until the telescopic tube 45 moves to the side of the transmission belt 43 away from the conveyor belt 22, so that the air pipe 32 and the telescopic tube 45 are automatically separated.

[0048] The transmission belt 43 and the conveyor belt 22 may have a slight speed difference during rotation, which may cause the air pipe 32 and the sleeve 452 to not be aligned with each other. In order to solve this problem, each telescopic tube 45 is connected to a regulating assembly 47.

[0049] The control assembly 47 includes a control plate 471 slidably connected to the outer wall of the transmission belt 43. A first connecting hole 4711 is defined in the control plate 471. A second connecting hole 431 is defined in the outer wall of the transmission belt 43. The first connecting hole 4711 and the second connecting hole 431 are aligned with each other. The end of the sleeve 451 closest to the transmission belt 43 is fixedly connected to the control plate 471 and communicates with the first connecting hole 4711.

[0050] Two sliders 472 are fixedly connected to a side wall of the control plate 471 near the transmission belt 43. The outer wall of the transmission belt 43 is provided with slots 432 corresponding to the number of sliders 472. Each slider 472 corresponds to one slot 432, and the sliders 472 slide and engage with each other in a sliding manner. Each slot 432 is provided with a control spring 473, one end of which is fixedly connected to the slider 472, and the other end is fixedly connected to a side wall of the slot 432. This allows the telescopic tube 45 to move left and right, allowing the sleeve 452 to be effectively connected to the outside of the air pipe 32 under the influence of magnetic force, and the magnet ring 1 461 and the magnet ring 2 462 attract each other.

[0051] Reference Figure 2 and Figure 3 The transition box 41 in the welding zone 11 is equipped with a heating mechanism, while the transition box 41 in the cooling zone 12 is equipped with a cooling mechanism. As each suction cup 31 in the welding zone 11 holds a corresponding circuit board, the air inside the cup 31 is heated, preheating the circuit board. In the cooling zone 12, the air inside the cup 31 is cooled, precooling the circuit board.

[0052] The operating principle of a reflow soldering machine for PCB circuit board soldering according to an embodiment of the present application is as follows: PCBs are continuously placed onto a conveyor belt 22 through an opening 13 near a soldering area 11, with each PCB aligned with a suction cup 31. After the PCBs are placed on the suction cups 31, the corresponding telescopic tubes 45 are simultaneously extended and sleeved onto the corresponding air pipes 32, and the exhaust fan 44 is activated, causing each suction cup 31 to absorb the corresponding PCB under the action of negative pressure.

[0053] The components on the circuit board are soldered while the circuit board moves in the soldering zone 11. The circuit board then moves from the conveying mechanism 2 in the soldering zone 11 to the conveying mechanism 2 in the cooling zone 12, where the solder joints are cooled and solidified.

[0054] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A reflow soldering machine for PCB circuit board soldering, comprising a body (1), characterized in that: A conveying mechanism (2) is provided in the body (1), and the conveying mechanism (2) includes a conveyor belt (22) for conveying circuit boards. The conveyor belt (22) is a hollow structure, and a plurality of suction holes (221) are provided on the outer ring surface of the conveyor belt (22). A suction cup (31) for adsorbing the circuit board is fixed in each suction hole (221), and an air pipe (32) is fixedly connected to the bottom end of each suction cup (31). Each air pipe (32) is located inside the conveyor belt (22), and one end of the air pipe (32) passes through the side wall of the conveyor belt (22) and extends out of the conveyor belt (22). An exhaust mechanism (4) for exhausting air from each air pipe (32) is provided on one side of the conveying mechanism (2).

2. The reflow soldering machine for PCB circuit board soldering according to claim 1, characterized in that: The exhaust mechanism (4) includes a hollow transition box (41), a circular hole (411) is opened on the circumferential side of the transition box (41), a transmission belt (43) is rotatably connected in the circular hole (411) to block the circular hole (411), a support column (42) is fixedly connected between the upper end and the bottom end of the transition box (41), a driving mechanism (5) is connected to the transition box (41) to drive the transmission belt (43) to rotate, an exhaust fan (44) is connected to the transition box (41), and the transmission belt (43) is fixedly connected with a number of telescopic tubes (45) equal to the number of air pipes (32), each telescopic tube (45) on the side of the transmission belt (43) close to the conveyor belt (22) is plugged into each air pipe (32) on the upper side of the conveyor belt (22), and each telescopic tube (45) is connected to an adjusting component (46) that drives the telescopic tube (45) to extend and plugs into the corresponding air pipe (32).

3. The reflow soldering machine for PCB circuit board soldering according to claim 2, characterized in that: The telescopic tube (45) includes a sleeve (451) connected to the transmission belt (43), and a sleeve (452) sleeved and slidably connected to the sleeve (451), a telescopic spring (453) is installed between the sleeve (452) and the sleeve (451), and the adjustment component (46) includes a magnet ring (461) fixedly connected to an end of the sleeve (452) away from the transmission belt (43), and also includes a magnet ring (462) sleeved and fixed on the outside of the air pipe (32), the magnet ring (461) and the magnet ring (462) are attracted to each other and the sleeve (452) is sleeved on the outside of the air pipe (32).

4. The reflow soldering machine for PCB circuit board soldering according to claim 3, characterized in that: The air tube (32) gradually contracts and becomes a pointed end in a direction away from the conveyor belt (22).

5. The reflow soldering machine for PCB circuit board soldering according to claim 3, characterized in that: The sleeve (451) is fixedly connected to one end thereof near the transmission belt (43) with a regulating plate (471), and the regulating plate (471) is fixedly connected to a side wall thereof near the transmission belt (43) with a slider (472). The outer side wall of the transmission belt (43) is provided with a number of slide grooves (432) equal to the number of slide grooves (432). The slider (472) is slidably plugged into the slide grooves (432), and a regulating spring (473) is fixedly connected between a side wall of the slider (472) and a side wall of the slide groove (432). The regulating plate (471) is provided with a connecting hole 1 (4711) communicating with the sleeve (451), and the transmission belt (43) is provided with a connecting hole 2 (431) aligned with the connecting hole 1 (4711).

6. The reflow soldering machine for PCB circuit board soldering according to claim 2, characterized in that: The machine body (1) includes a welding zone (11) and a cooling zone (12), and both the welding zone (11) and the cooling zone (12) are provided with a conveying mechanism (2). The two conveying mechanisms (2) are in end-to-end contact with each other, and each conveying mechanism (2) is connected to a corresponding exhaust mechanism (4).

7. The reflow soldering machine for PCB circuit board soldering according to claim 6, characterized in that: A heating mechanism is installed in the transition box (41) connected to the conveying mechanism (2) in the welding zone (11), and a cooling mechanism is installed in the transition box (41) connected to the conveying mechanism (2) in the cooling zone (12).

8. The reflow soldering machine for PCB circuit board soldering according to claim 2, characterized in that: The driving mechanism (5) includes a gear (51) rotatably connected to the interior of the transition box (41); the inner surface wall of the transmission belt (43) is provided with a plurality of convex teeth (52); the gear (51) is meshed with the convex teeth (52); and the transition box (41) is connected to an adjusting motor (53) for driving the gear (51) to rotate.

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