A reflow soldering machine for PCB circuit board welding

Abstract

The application relates to a reflow soldering machine for PCB (Printed Circuit Board) welding, and relates to the field of reflow soldering machines. The reflow soldering machine comprises a machine body, a conveying mechanism arranged in the machine body, a conveying belt for conveying the circuit board, a hollow structure, a plurality of suction holes formed in the outer ring surface of the conveying belt, a suction disc for adsorbing the circuit board fixed in each suction hole, an air pipe fixedly connected to the bottom end of each suction disc, the air pipe located in the interior of the conveying belt, one end of the air pipe penetrating through the side wall of the conveying belt and extending into the conveying belt, and an air extraction mechanism arranged on one side of the conveying mechanism and used for extracting air from each air pipe. The application has the effect of limiting circuit boards of different sizes.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of reflow soldering machine, in particular to a reflow soldering machine for PCB circuit board welding. BACKGROUND

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

[0003] A suitable amount and form of solder paste is applied in advance on the pads of the circuit board, and the components are placed in the corresponding position, the solder paste has certain adhesion, so that the components are fixed, and then the circuit board with the components is placed into the reflow soldering machine, the inside of the device has a heating circuit, which heats the air or nitrogen to a high enough temperature and blows it to the circuit board with the components, so that the solder on both sides of the components melts and is bonded to the circuit board.

[0004] In order to reduce the displacement of the circuit board under the influence of the 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 boards of specific size. SUMMARY

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

[0006] The reflow soldering machine for PCB circuit board welding provided by the present application adopts the following technical scheme:

[0007] A reflow soldering machine for PCB circuit board welding, comprising a machine body, a conveying mechanism is arranged in the machine body, the conveying mechanism comprises a conveying belt for conveying the circuit board, the conveying belt is a hollow structure, a plurality of suction holes are formed on the outer surface of the conveying belt, a suction disc for suctioning the circuit board is fixed in each suction hole, a gas pipe is fixedly connected to the bottom end of each suction disc, each gas pipe is located in the inside of the conveying belt, one end of the gas pipe penetrates through the side wall of the conveying belt and extends out of the conveying belt, and an air suction mechanism for sucking air from each gas pipe is arranged on one side of the conveying mechanism.

[0008] By adopting the above technical scheme, after the circuit board is placed on the conveying belt, one circuit board corresponds to one suction disc, air is sucked from each gas pipe by the air suction mechanism, so that each gas pipe is in a negative pressure state. The suction disc suctions the circuit board, so that the circuit board is fixed on the conveying belt. The suction disc is convenient for suctioning circuit boards of different sizes, so that it is convenient for limiting circuit boards of different sizes.

[0009] Preferably, the air extraction mechanism comprises a hollow transition box, an annular hole is formed in the peripheral side of the transition box, a transmission belt is rotatably connected in the annular hole and blocks 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 air extractor is connected to the transition box, a number of telescopic pipes equivalent to the number of air pipes are fixedly connected to the transmission belt, each telescopic pipe on the side of the transmission belt close to the conveying belt is inserted into each air pipe on the upper side of the conveying belt, and an adjusting assembly for driving the telescopic pipe to elongate and be inserted into the corresponding air pipe is connected to each telescopic pipe.

[0010] By adopting the technical scheme, the air extractor is started, the transition box extracts air from the inside of the machine body at this time, and the exhaust gas in the machine body is conveniently discharged. During the rotation of the conveying belt, the driving mechanism drives the transmission belt to rotate, the transmission belt drives each telescopic pipe to rotate, and the adjusting assembly drives each telescopic pipe on the side of the transmission belt close to the conveying belt to elongate and be inserted into each air pipe on the upper side of the conveying belt, so that each suction cup on the upper side of the conveying belt is adsorbed to the corresponding circuit board. During the conveying of the circuit board by the conveying belt, the transmission belt also rotates, so that the conveying of the circuit board by the conveying belt is not affected.

[0011] Preferably, the telescopic pipe comprises a sleeve in communication with the transmission belt, and a sleeve in sleeved connection and sliding connection with the sleeve, an elastic spring is arranged between the sleeve and the sleeve, the adjusting assembly comprises a magnet ring one fixedly connected to the end of the sleeve away from the transmission belt, and a magnet ring two fixedly sleeved to the outside of the air pipe, the magnet ring one and the magnet ring two are adsorbed to each other, and the sleeve is sleeved to the outside of the air pipe.

[0012] By adopting the technical scheme, when each telescopic pipe is rotated and aligned with the corresponding air pipe, the magnet ring one moves in the direction close to the air pipe under the attraction of the magnet ring two until the magnet ring one and the magnet ring two are adsorbed to each other, and the sleeve and the air pipe are inserted. When the transmission belt and the conveying belt drive the telescopic pipe and the air pipe to move away from each other, the magnet ring one and the magnet ring two are separated from each other, and the telescopic pipe and the air pipe are automatically separated from each other.

[0013] Preferably, the air pipe is gradually tapered to a pointed end away from the conveying belt.

[0014] By adopting the technical scheme, the sleeve is conveniently sleeved to the outside of the air pipe, and the insertion of the sleeve and the air pipe is smoothly completed.

[0015] Preferably, one end of the sleeve is fixedly connected with a regulating plate close to the transmission belt, one side wall of the regulating plate close to the transmission belt is fixedly connected with a sliding block, the outer side wall of the transmission belt is provided with sliding slots in number equal to that of the sliding blocks, the sliding blocks are slidingly inserted into the sliding slots, a regulating spring is fixedly connected between one side wall of the sliding block and one side wall of the sliding slot, the regulating plate is provided with a through hole one in communication with the sleeve, and the transmission belt is provided with a through hole two aligned with the through hole one.

[0016] Through the above technical scheme, when the transmission belt and the transmission belt have a slight difference in rotation rate, the telescopic pipe can move left and right, and then drive the corresponding air pipe to complete the insertion under the action of the mutual adsorption force of the magnet ring one and the magnet ring two.

[0017] Preferably, the machine body comprises a welding area and a cooling area, and the welding area and the cooling area are both provided with conveying mechanisms, and the two conveying mechanisms are in contact with each other in a head-to-tail manner, and each conveying mechanism is connected with a corresponding suction mechanism.

[0018] Through the above technical scheme, when the circuit board moves to the welding area, the solder at the welding point melts to bond the components and the circuit board, and then the circuit board is conveyed to the conveying mechanism in the cooling area, and the welding point solidifies in the cooling area, so that the welding is completed.

[0019] Preferably, a heating mechanism is installed in the transition box connected with the conveying mechanism of the welding area, and a cooling mechanism is installed in the transition box connected with the conveying mechanism of the cooling area.

[0020] Through the above technical scheme, when the conveying mechanism in the welding area conveys the circuit board, the air in the suction cup is hot air, and the suction cup adsorbs the circuit board to achieve the preheating effect on the circuit board. The air in the suction cup of the cooling area is cold air, and the suction cup adsorbs the circuit board to achieve the precooling effect on the circuit board.

[0021] Preferably, the driving mechanism comprises a gear rotatingly connected in the transition box, the inner surface wall of the transmission belt is provided with a plurality of protrusions, the gear is engaged with the protrusions, and the transition box is connected with an adjusting motor driving the gear to rotate.

[0022] Through the above technical scheme, the adjusting motor is started, the output shaft of the adjusting motor drives the gear to rotate, and the gear rotating can drive the transmission belt to rotate through the protrusions, which is simple and convenient to operate.

[0023] In summary, the present application has at least one of the following beneficial technical effects:

[0024] The suction cup is convenient for adsorbing circuit boards of different sizes and convenient for limiting circuit boards of different sizes;

[0025] The telescopic pipe and the air pipe are automatically inserted and separated from each other;

[0026] The suction disc of the welding area can preheat the circuit board, and the suction disc of the cooling area can precool the circuit board. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a schematic diagram of the overall mechanism of the reflow soldering machine embodied in the embodiment of the present application.

[0028] Figure 2 is a schematic diagram of the internal structure of the reflow soldering machine embodied in the embodiment of the present application.

[0029] Figure 3 is a schematic diagram of the structure of the limiting mechanism embodied in the embodiment of the present application.

[0030] Figure 4 is a schematic diagram of the internal structure of the transition box embodied in the embodiment of the present application.

[0031] Figure 5 is a schematic diagram of the internal structure of the transition box embodied in the embodiment of the present application. Figure 4 is an enlarged view of A in FIG. 1.

[0032] BRIEF DESCRIPTION OF DRAWINGS 1, machine body; 11, welding area; 12, cooling area; 13, opening; 2, conveying mechanism; 21, rotating roller; 22, conveying belt; 221, suction hole; 3, limiting mechanism; 31, suction disc; 32, air pipe; 4, air extraction mechanism; 41, transition box; 411, annular hole; 42, support column; 43, transmission belt; 431, second connecting hole; 432, sliding groove; 44, air extractor; 45, telescopic pipe; 451, sleeve; 452, sleeve; 453, telescopic spring; 46, adjusting assembly; 461, first magnet ring; 462, second magnet ring; 47, regulating assembly; 471, regulating plate; 4711, first connecting hole; 472, sliding block; 473, regulating spring; 5, driving mechanism; 51, gear; 52, protruding tooth; 53, adjusting motor. DETAILED DESCRIPTION

[0033] The following will be described in detail in combination with the accompanying drawings. Figures 1-5 The present application will be further described in detail.

[0034] The embodiment of the present application discloses a reflow soldering machine for PCB circuit board welding. Referring to Figure 1 and Figure 2 , the reflow soldering machine comprises a machine body 1, the machine body 1 is internally provided with a welding area 11 and a cooling area 12, the welding area 11 and the cooling area 12 are both provided with a conveying mechanism 2, and the two conveying mechanisms 2 are completely consistent.

[0035] The body 1 is provided with openings 13 at both ends, the circuit board is conveyed into the body 1 by one of the conveying mechanisms 2 and enters the soldering area 11, the soldering area 11 blows hot air so that the solder on both sides of the component melts and is bonded with the circuit board. After that, the circuit board is conveyed to the other conveying mechanism 2 by the conveying mechanism 2, and then enters the cooling area 12, the circuit board is blown by cold air in the cooling area 12, the soldering point is cooled and solidified to complete the soldering.

[0036] Referring to Figure 2 and Figure 3 Each conveying mechanism 2 comprises two rotating rollers 21 rotatingly connected in the body 1 and a conveying belt 22 installed on the two rotating rollers 21, and each conveying mechanism 2 comprises a motor fixedly installed on the body 1, the motor is coaxially fixed with one of the rotating shafts and is used for driving the rotating shaft to rotate.

[0037] When the conveying mechanism 2 conveys the circuit board, in order to limit the displacement of the circuit board relative to the conveying belt 22, the limiting mechanism 3 is connected to each conveying mechanism 2.

[0038] Each conveying belt 22 is of a hollow structure, the limiting mechanism 3 comprises a plurality of suction cups 31 arranged in the cavity of the conveying belt 22, and the plurality of suction cups 31 are uniformly distributed around the conveying belt 22. The outer surface of each conveying belt 22 is provided with a plurality of suction holes 221, one suction hole 221 corresponds to one suction cup 31, the suction cup 31 is inserted into the suction hole 221 and is fixedly connected with the conveying belt 22. One end of the suction cup 31 close to the inner circle of the conveying belt 22 is fixedly connected with an air pipe 32, and the other end of the suction cup 31 close to the outer circle of the conveying belt 22 is flush with the outer circle surface of the conveying belt 22. The air pipe 32 is in a bent state, and the end of the air pipe 32 away from the suction cup 31 penetrates through one side wall of the conveying belt 22 and is fixedly connected with the conveying belt 22.

[0039] One side of each conveying mechanism 2 is provided with an air extraction mechanism 4 used for connecting with 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, so as to reduce the mutual interference of the two air extraction mechanisms 4.

[0040] When the conveying belt 22 rotates, each circuit board is placed on the conveying belt 22 from the opening 13 close to the soldering area 11. One circuit board corresponds to one suction cup 31, and the bottom surface of the circuit board is placed against the suction cup 31. At the same time, the air extraction mechanism 4 is started to extract air from each air pipe 32 on the upper side of the conveying belt 22, so that each suction cup 31 adsorbs the corresponding circuit board, and the displacement of the circuit board is limited. The suction cup 31 is adsorbed in the middle of the circuit board, so that any circuit board larger than the size of the suction cup 31 can be adsorbed on the conveying belt 22.

[0041] The suction cup 31 is made of elastic material, and the suction cup 31 is in the shape of a flared shape. The suction cup 31 can better adsorb the circuit board.

[0042] Referring to Figure 3 and Figure 4 , the air extraction mechanism 4 includes a transition box 41 fixed in the body 1, and the transition box 41 is arranged along the length direction of the conveying mechanism 2. The circumferential side of the transition box 41 is provided with an annular hole 411, and the annular hole 411 divides the transition box 41 into two parts. The inner bottom wall of the transition box 41 is fixedly connected with two support columns 42, and the upper surface of each support column 42 is fixedly connected with the inner top wall of the transition box 41. The annular hole 411 is provided with a transmission belt 43 for closing the annular hole 411, and the transmission belt 43 is rotatably connected with the transition box 41. The transmission belt 43 is connected with a driving mechanism 5 for driving the transmission belt 43 to rotate.

[0043] Referring to Figure 4 and Figure 5 , the upper surface of the transition box 41 is provided with an air extractor 44 (see Figure 2 ), one end of the air extractor 44 is communicated with the inside of the transition box 41, and the other end penetrates through the top wall of the body 1 and extends outside the body 1. A plurality of telescopic pipes 45 are installed on the transmission belt 43, and each telescopic pipe 45 is communicated with the inside of the transition box 41. The plurality of telescopic pipes 45 are distributed around the circumference of the transmission belt 43, and the number of telescopic pipes 45 near the conveying mechanism 2 side of the transmission belt 43 is equal to the number of air pipes 32 on the upper side of the conveying belt 22. Each telescopic pipe 45 near the conveying mechanism 2 side of the transmission belt 43 is elongated and inserted with one of the air pipes 32 on the upper side of the conveying belt 22. Each telescopic pipe 45 is connected with an adjusting assembly 46 for driving the telescopic pipe 45 to elongate and be inserted with the air pipe 32.

[0044] During the rotation of the conveying belt 22, the driving mechanism 5 drives the transmission belt 43 to rotate, keeping the rotation rate of the transmission belt 43 consistent with that of the conveying belt 22. The elongation of each telescopic pipe 45 near the conveying belt 22 side of the transmission belt 43 and the insertion with each air pipe 32 on the upper side of the conveying belt 22 are adjusted, and the air extractor 44 (see Figure 2 ) is started at the same time. In this way, each suction cup 31 can adsorb a corresponding circuit board.

[0045] Referring to Figure 2 and Figure 4 , the driving mechanism 5 includes two gears 51 rotatably connected inside the transition box 41, and the inner side wall of the transmission belt 43 is provided with a plurality of protrusions 52 distributed around the circumference of the transmission belt 43. Each gear 51 is located at one end of the transmission belt 43 and engages with the protrusions 52. The outer top wall of the transition box 41 is provided with an adjusting motor 53, and the output shaft of the adjusting motor 53 vertically penetrates through the top wall of the transition box 41 and is fixedly connected with one of the gears 51 coaxially.

[0046] 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 .

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] The regulating assembly 47 comprises a regulating plate 471 slidably connected to the outer side wall of the transmission belt 43, and a through hole 4711 is formed in the regulating plate 471. A through hole 431 is formed in the outer side wall of the transmission belt 43, and the through hole 4711 is aligned with the through hole 431. The sleeve 451 is fixedly connected to the regulating plate 471 at one end close to the transmission belt 43 and communicates with the through hole 4711.

[0054] The regulating plate 471 is fixedly connected to two sliding blocks 472 at one side close to the transmission belt 43. The outer side wall of the transmission belt 43 is provided with sliding grooves 432 corresponding to the number of the sliding blocks 472. One sliding block 472 corresponds to one sliding groove 432, and the sliding block 472 is slidably inserted into the sliding groove 432. The regulating spring 473 is arranged in each sliding groove 432. One end of the regulating spring 473 is fixedly connected to the sliding block 472, and the other end is fixedly connected to one side wall of the sliding groove 432. The telescopic pipe 45 has a certain space for left and right movement, which facilitates the sleeve 452 to be sleeved on the outer side of the air pipe 32 under the driving of the magnetic force, and the magnetic ring 461 and the magnetic ring 462 are attracted to each other.

[0055] Referring to Figure 2 and Figure 3 , the heating mechanism is arranged in the transition box 41 in the welding area 11, and the refrigeration mechanism is arranged in the transition box 41 in the cooling area 12. When each suction cup 31 in the welding area 11 adsorbs the corresponding circuit board, the air in the suction cup 31 is hot air, which has a preheating effect on the circuit board. When each suction cup 31 in the cooling area 12 adsorbs the corresponding circuit board, the air in the suction cup 31 is cold air, which has a precooling effect on the circuit board.

[0056] The implementation principle of the reflow soldering machine for welding the PCB circuit board is that the circuit board is continuously placed on the conveying belt 22 from the opening 13 close to the welding area 11, and one circuit board is aligned with one suction cup 31. After the circuit board is placed on the suction cup 31, the corresponding telescopic pipe 45 is elongated and sleeved on the corresponding air pipe 32, the air blower 44 is started, and each suction cup 31 adsorbs the corresponding circuit board under the action of negative pressure.

[0057] During the movement of the circuit board in the welding area 11, the components on the circuit board are welded. Then the circuit board moves from the conveying mechanism 2 of the welding area 11 to the conveying mechanism 2 of the cooling area 12, and the solder joints are cooled and solidified in the cooling area 12.

[0058] The above are the preferred embodiments of the present application, but do not limit the protection scope of the present application. Therefore, any equivalent changes made on the basis of the structure, shape and principle of the present application should be covered within the protection scope 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), and 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), and 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), and an exhaust mechanism (4) for exhausting air from each air pipe (32) is provided on one side of the conveying mechanism (2); The exhaust mechanism (4) includes a hollow transition box (41), a circular hole (411) is opened on the peripheral 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); 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 first magnet ring (461) fixedly connected to an end of the sleeve (452) away from the transmission belt (43), and also includes a second magnet ring (462) sleeved and fixed on the outside of the air pipe (32), the first magnet ring (461) and the second magnet ring (462) are attracted to each other, and the sleeve (452) is sleeved on the outside of the air pipe (32); The air tube (32) gradually contracts and becomes a pointed end in a direction away from the conveyor belt (22); 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).

2. The reflow soldering machine for PCB circuit board soldering according to claim 1, 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).

3. The reflow soldering machine for PCB circuit board soldering according to claim 2, 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).

4. The reflow soldering machine for PCB circuit board soldering according to claim 1, 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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