Wave-soldering machine for production of circuit boards

Abstract

The application provides a wave soldering machine for circuit board production and belongs to the technical field of circuit board production equipment. The wave soldering machine comprises a machine table and two conveying units arranged in parallel with each other. The two conveying units are provided with heating covers on the opposite sides. The heating covers are provided with heating cavities on the sides close to the input ends of the conveying units. The heating cavities are provided with infrared heating pipes for heating the chain claws. The heating cover and the infrared heating pipe are arranged to perform infrared radiation heating on the chain claws by the infrared heating pipe, thereby reducing the temperature difference between the chain claws and the molten solder and avoiding the solidification of the molten high-temperature solder to form slag when the high-temperature solder contacts the chain claws due to the sudden temperature drop. The heat exchange bin and the smoke collecting cover are arranged to draw the high-temperature smoke above the soldering pool by the smoke collecting cover. Finally, the high-temperature smoke is conveyed into the preheating cavity to preheat the chain claws about to enter the heating cavity, thereby reducing the energy consumption required for heating the chain claws to the specified temperature by the infrared heating pipe.

Description

Technical Field

[0001] This invention belongs to the technical field of circuit board production equipment, specifically referring to a wave soldering machine for circuit board production. Background Technology

[0002] A circuit board is a conductive plate used to support and connect electronic components. It connects various electronic components through conductive patterns to form a complete circuit. Electronic components are fixed to the circuit board by solder pads and connected to other components through wires or vias, thereby enabling the transmission of electrical energy and control signals.

[0003] A wave soldering machine is a type of soldering equipment used to achieve mechanical and electrical connections between electronic components and printed circuit boards. It works by spraying molten solder (usually a lead-tin alloy) into a solder wave as required by a design through an electric or electromagnetic pump, or by injecting nitrogen into the solder bath. The circuit board with components pre-loaded passes through the solder wave, thereby achieving the connection between the component solder ends or leads and the pads on the printed circuit board.

[0004] Wave soldering machines use a conveyor chain to transport circuit boards for soldering. The circuit boards are supported by chain claws on the conveyor chain. As the circuit board passes through the solder wave crest, the chain claws supporting the circuit board also pass through the solder wave crest. Current wave soldering machines do not have a temperature control unit for the chain claws. Therefore, the chain claw temperature is affected by the room temperature. When the indoor air temperature is low, there is a large temperature difference between the chain claws and the molten solder. At this time, the contact between the chain claws and the molten solder will cause the local temperature of the solder to drop, resulting in solder slag. At the same time, the solidified solder slag will also adhere to the chain claws, causing the circuit board to be misaligned when it is subsequently supported, resulting in incomplete soldering or misaligned soldering of the circuit board. Summary of the Invention

[0005] In view of the above situation and to overcome the defects of the prior art, the present invention provides a wave soldering machine for circuit board production, which at least partially solves the above problems.

[0006] The technical solution adopted by the present invention is as follows: The present invention proposes a wave soldering machine for circuit board production, including a machine base and two conveying units arranged in parallel with each other. The machine base is provided with a solder pool, and the two conveying units are respectively located on both sides of the solder pool.

[0007] The conveying unit is equipped with multiple evenly distributed chain claws for supporting the circuit board;

[0008] Each of the two conveying units is provided with a heating cover on the opposite side, and a heating cavity is provided on the side of the heating cover near the input end of the conveying unit, and an infrared heating tube is provided in the heating cavity;

[0009] The heating hood has a preheating chamber on the side near the output end of the conveying unit, and a heat exchange chamber is provided on the outside of the heating chamber. An air duct is provided between the heat exchange chamber and the preheating chamber.

[0010] Furthermore, each of the two conveying units is provided with a fume hood on one side. One end of the fume hood is provided with a second air duct. The two ends of the second air duct are respectively connected to the fume hood and the heat exchange chamber, so that the high-temperature fumes at the welding pool are conveyed to the heat exchange chamber.

[0011] Furthermore, the smoke inlet of the smoke collection hood is provided with a dispersion plate, and the dispersion plate has multiple air intakes for dispersing negative pressure.

[0012] Furthermore, the interior of the heat exchange chamber is provided with multiple heat-conducting fins for increasing the heat exchange area, and the heat-conducting fins are fixed on the heating cover.

[0013] Furthermore, the multiple heat-conducting fins are arranged in an alternating manner, forming heat exchange channels within the heat exchange chamber.

[0014] Furthermore, the air intake component includes an air intake fan and a first air intake duct. The first end of the first air intake duct is connected to the heat exchange chamber, and the second end of the first air intake duct extends into the preheating chamber. The air intake fan is connected in series with the first air intake duct.

[0015] Furthermore, the first exhaust pipe and the second exhaust pipe are respectively connected to both ends of the heat exchange chamber, so that the flue gas transported by the second exhaust pipe can pass through the heat exchange chamber.

[0016] Furthermore, the second end of the first air duct is connected to the end of the preheating chamber near the heating chamber, and the air delivery direction of the second end of the first air duct is toward the end of the preheating chamber away from the heating chamber.

[0017] Furthermore, the preheating chamber is provided with a smoke exhaust pipe at the end away from the heating chamber, and the smoke exhaust pipe is connected to an external centrifugal fan.

[0018] Furthermore, the machine platform is provided with a protective casing.

[0019] The beneficial effects achieved by the present invention using the above structure are as follows:

[0020] 1. By setting up a heating cover and an infrared heating tube, the chain claw is heated by infrared radiation through the infrared heating tube, which reduces the temperature difference between the chain claw and the molten solder and prevents the molten high-temperature solder from solidifying and forming slag when it comes into contact with the chain claw due to a sudden drop in temperature.

[0021] 2. By setting up a heat exchange chamber and a fume hood, the fume hood extracts the high-temperature fumes above the welding pool and transports them to the heat exchange chamber. The heat from the heating hood further heats the high-temperature fumes, and finally, the high-temperature fumes are transported to the preheating chamber to preheat the chain claws that are about to enter the heating chamber. This reduces the energy consumption required for the infrared heating tube to heat the chain claws to the specified temperature. While exhausting the fumes, the heat from the infrared heating tube and the high-temperature fumes is fully utilized to reduce energy consumption. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a wave soldering machine for circuit board production according to an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the chain claw distribution in a wave soldering machine for circuit board production according to an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram showing the installation position of the heat exchange chamber in a wave soldering machine for circuit board production according to an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram showing the positional distribution of heat-conducting fins in a wave soldering machine for circuit board production, as proposed in an embodiment of the present invention.

[0026] Figure 5 This is a schematic diagram showing the installation position of the exhaust pipe in a wave soldering machine for circuit board production according to an embodiment of the present invention;

[0027] Figure 6 This is a schematic diagram of the internal structure of the heating shroud in a wave soldering machine for circuit board production according to an embodiment of the present invention;

[0028] Figure 7 This is a schematic diagram of the heating of an infrared heating tube in a wave soldering machine for circuit board production according to an embodiment of the present invention;

[0029] Figure 8 This is a schematic diagram illustrating the movement direction of the chain claw in a wave soldering machine for circuit board production, as proposed in an embodiment of the present invention.

[0030] Among them, 100 is the casing; 1 is the machine base; 101 is the welding pool; 11 is the conveying unit; 12 is the chain claw; 2 is the heating cover; 201 is the heating chamber; 202 is the preheating chamber; 21 is the heat exchange chamber; 22 is the heat-conducting fins; 3 is the infrared heating tube; 4 is the induced draft fan; 41 is the first induced draft duct; 5 is the smoke collection hood; 51 is the second induced draft duct; 52 is the dispersion plate; 501 is the air intake; and 6 is the smoke exhaust pipe.

[0031] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0033] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0034] like Figure 1 and Figure 2 As shown, the present invention proposes a wave soldering machine for circuit board production, including a machine base 1 and two conveying units 11. A solder pool 101 is provided on the table surface of the machine base 1. The machine base 1 is equipped with a heating unit for melting soft solder and an electric pump. The molten soft solder is sprayed by the electric pump and forms a solder wave peak that meets the design requirements in the solder pool 101.

[0035] Two conveying units 11 are parallel to each other and located on both sides of the solder pool 101. The conveying unit 11 is a chain conveyor belt. The conveying chain of the conveying unit 11 is provided with multiple evenly distributed chain claws 12. The circuit board is supported by the chain claws 12 between the two conveying units 11. Driven by the conveying unit 11, the circuit board passes through the solder pool 101 and comes into contact with the solder crest, thereby connecting the component solder ends or pins with the circuit board pads.

[0036] Furthermore, the table surface of the machine tool 1 is provided with a protective casing 100.

[0037] Combination Figure 3 , Figure 6 and Figure 8 As shown, each of the two conveying units 11 has a heating cover 2 on its opposite side. The chain claw 12 is covered by the heating cover 2 as it moves from the output end to the input end of the conveying unit 11 (e.g., ...). Figure 8 As shown), the heating cover 2 is provided with a heating chamber 201 on the side near the input end of the conveying unit 11. The heating chamber 201 is provided with an infrared heating tube 3. The chain claw 12 is heated by infrared radiation through the infrared heating tube 3, which reduces the temperature difference between the chain claw 12 and the molten solder and prevents the molten high-temperature solder from solidifying and forming slag due to a sudden drop in temperature when it comes into contact with the chain claw 12.

[0038] Thus, when the chain claw 12 passes through the heating chamber 201 of the heating cover 2, the chain claw 12 is heated by the infrared heating tube 3, and the power of the infrared heating tube 3 is set to heat the chain claw 12 to a specified temperature, so that when the chain claw 12 moves from the heating chamber 201 to the solder pool 101, the surface temperature of the chain claw 12 is close to the temperature of the solder. When the chain claw 12 comes into contact with the solder, the fluidity of the solder around the chain claw 12 is maintained, and the molten high-temperature solder is prevented from solidifying on the surface of the chain claw 12 due to a sudden drop in temperature when it comes into contact with the chain claw 12, thus forming solder slag.

[0039] Combination Figure 7 As shown, since the infrared heating tube 3 uses infrared radiation to heat the chain claw 12, and infrared radiation will be reflected, the infrared radiation generated by the infrared heating tube 3 will be reflected in the heating cavity 201, so that the heating cover 2 will also be heated. However, the heating cover 2 only serves to isolate the cold air and keep it warm, and cannot directly heat the chain claw 12.

[0040] Combination Figure 3 , Figure 5 and Figure 6 As shown, the heating cover 2 is located outside the heating chamber 201 and has a heat exchange chamber 21. As the infrared heating tube 3 continuously heats the chain claw 12, the heating cover 2 is also continuously heated. Through the heat exchange chamber 21, the heat on the heating cover 2 can be used to heat the air inside the heat exchange chamber 21. The heating cover 2 is located on the side near the output end of the conveying unit 11 and has a preheating chamber 202. A fan is provided between the heat exchange chamber 21 and the preheating chamber 202. The fan is used to transport the hot air in the heat exchange chamber 21 to the preheating chamber 202.

[0041] Since the chain claw 12 moves sequentially from the output end of the conveying unit 11 to the preheating chamber 202, the heating chamber 201, and finally to the input end of the conveying unit 11, the hot air in the heat exchange chamber 21 is used to preheat the chain claw 12 in the preheating chamber 202, causing the temperature of the chain claw 12 to rise. After entering the heating chamber 201, since the chain claw 12 is preheated, the energy consumption required to heat the chain claw 12 to the specified temperature is reduced, making full use of the heat generated by the infrared heating tube 3 and reducing energy consumption.

[0042] Thus, the infrared heating tube 3 continuously heats the chain claw 12, causing the heating cover 2 to also be continuously heated. The heat from the heating cover 2 is used to heat the air in the heat exchange chamber 21. Then, the hot air in the heat exchange chamber 21 is transported to the preheating chamber 202 by the air intake component. The chain claw 12 first enters the preheating chamber 202 from the output end of the conveying unit 11, and is preheated by the hot air. Then, the chain claw 12 enters the heating chamber 201, and is heated by the infrared heating tube 3.

[0043] Combination Figure 1 and Figure 2 As shown, each of the two conveying units 11 is provided with a smoke collection hood 5 on one side. One end of the smoke collection hood 5 is provided with a second air duct 51. The two ends of the second air duct 51 are respectively connected to the smoke collection hood 5 and the heat exchange chamber 21, so that the smoke collection hood 5 and the heat exchange chamber 21 are connected.

[0044] When the induced draft component draws air from the heat exchange chamber 21, a negative pressure is formed at the inlet of the fume hood 5, thereby drawing out the high-temperature fumes generated above the welding pool 101. The high-temperature fumes are then transported to the heat exchange chamber 21 for further heating, and then transported by the induced draft component to the preheating chamber 202 to heat the chain claw 12. Due to the high temperature of the fumes, the gas has a high initial temperature after entering the heat exchange chamber 21. After being heated by the heat exchange chamber 21, the gas temperature is further increased, raising the gas temperature entering the preheating chamber 202. The heat from the high-temperature fumes can be used to heat the chain claw 12, further saving energy.

[0045] In a specific embodiment, the air intake component includes an air intake fan 4 and a first air intake pipe 41. The first end of the first air intake pipe 41 is connected to the heat exchange chamber 21, and the second end of the first air intake pipe 41 extends into the preheating chamber 202. The air intake fan 4 is connected in series with the first air intake pipe 41, and the air intake fan 4 transports the gas in the heat exchange chamber 21 to the preheating chamber 202 through the first air intake pipe 41.

[0046] Combination Figure 3 As shown, the first exhaust pipe 41 and the second exhaust pipe 51 are respectively connected to the two ends of the heat exchange chamber 21, so that the flue gas transported by the second exhaust pipe 51 can pass through the heat exchange chamber 21 and be fully heated.

[0047] Combination Figure 5 and Figure 6 As shown, the preheating chamber 202 is provided with a smoke exhaust pipe 6 at the end away from the heating chamber 201. The smoke exhaust pipe 6 is connected to an external centrifugal fan. When the induced draft component delivers high-temperature flue gas to the preheating chamber 202, the external centrifugal fan uses the smoke exhaust pipe 6 to exhaust the flue gas in the preheating chamber 202, thereby playing the role of smoke exhaust and preventing the flue gas from drifting in the workshop.

[0048] Furthermore, the second end of the first exhaust pipe 41 is connected to the end of the preheating chamber 202 near the heating chamber 201, and the air delivery direction of the second end of the first exhaust pipe 41 is towards the end of the preheating chamber 202 away from the heating chamber 201, while the exhaust pipe 6 is located at the end of the preheating chamber 202 away from the heating chamber 201 (e.g., Figure 6 As shown), the negative pressure suction of the exhaust pipe 6 allows the gas delivered from the first exhaust pipe 41 to the preheating chamber 202 to pass through the preheating chamber 202, fully heat the chain claw 12, and then be discharged through the exhaust pipe 6.

[0049] Combination Figure 2As shown, the smoke inlet of the smoke hood 5 is provided with a dispersion plate 52, and multiple air inlets 501 for dispersing negative pressure are opened on the dispersion plate 52, so that the negative pressure suction force at each position of the smoke hood 5 tends to be consistent, and the smoke collection effect of each position of the smoke hood 5 on the smoke is maintained.

[0050] Combination Figure 3 ,and Figure 4 As shown, the interior of the heat exchange chamber 21 is provided with multiple heat-conducting fins 22 for increasing the heat exchange area. The heat-conducting fins 22 are fixed on the heating cover 2. The heat-conducting fins 22 are used to increase the area of ​​heat transfer from the heating cover 2 to the heat exchange chamber 21, so that the gas can be fully heated in the heat exchange chamber 21.

[0051] Furthermore, the multiple heat-conducting fins 22 are staggered, forming a longer heat exchange channel within the heat exchange chamber 21, increasing the flow time of the gas within the heat exchange chamber 21, allowing the gas to be fully heated, and improving the heat utilization rate.

[0052] The working principle of the present invention is as follows: molten soft solder is sprayed by an electric pump and forms a solder peak that meets the design requirements in the solder pool 101. The circuit board is supported by the chain claw 12 between the two conveying units 11. Under the drive of the conveying unit 11, the circuit board passes through the solder pool 101 and comes into contact with the solder peak, thereby connecting the component solder ends or pins with the circuit board pads.

[0053] During the process of the chain claw 12 moving from the output end to the input end of the conveying unit 11, it passes through the heating cover 2. When the chain claw 12 passes through the heating chamber 201 of the heating cover 2, the chain claw 12 is heated by the infrared heating tube 3. By adjusting the power of the infrared heating tube 3, the chain claw 12 is heated to a specified temperature so that when the chain claw 12 moves from the heating chamber 201 to the solder pool 101, the surface temperature of the chain claw 12 is close to the temperature of the solder. When the chain claw 12 comes into contact with the solder, the fluidity of the solder around the chain claw 12 is maintained, and the molten high-temperature solder is prevented from solidifying on the surface of the chain claw 12 due to a sudden drop in temperature when it comes into contact with the chain claw 12, thus forming solder slag.

[0054] As the infrared heating tube 3 continuously heats the chain claw 12, the heating cover 2 is also continuously heated. The heat from the heating cover 2 is used to heat the air in the heat exchange chamber 21. Then, the hot air in the heat exchange chamber 21 is transported to the preheating chamber 202 by the air intake component. The chain claw 12 first enters the preheating chamber 202 from the output end of the conveying unit 11. The chain claw 12 is preheated by the hot air. Then, the chain claw 12 enters the heating chamber 201 and is heated by the infrared heating tube 3. Since the chain claw 12 is preheated, the energy consumption required to heat the chain claw 12 to the specified temperature is reduced. The heat generated by the infrared heating tube 3 is fully utilized, and energy consumption is reduced.

[0055] When the induced draft component draws air from the heat exchange chamber 21, a negative pressure is formed at the inlet of the fume hood 5, thereby drawing out the high-temperature fumes generated above the welding pool 101. The high-temperature fumes are then transported to the heat exchange chamber 21 for further heating, and then transported by the induced draft component to the preheating chamber 202 to heat the chain claw 12. Due to the high temperature of the fumes, the gas has a high initial temperature after entering the heat exchange chamber 21. After being heated by the heat exchange chamber 21, the gas temperature is further increased, raising the temperature of the gas entering the preheating chamber 202. The heat from the high-temperature fumes can be used to heat the chain claw 12, further saving energy. The end of the preheating chamber 202 away from the heating chamber 201 is equipped with an exhaust pipe 6, which is connected to an external centrifugal fan. When the induced draft component transports the high-temperature fumes to the preheating chamber 202, the external centrifugal fan uses the exhaust pipe 6 to discharge the fumes from the preheating chamber 202, thus playing a role in smoke removal and preventing the fumes from spreading in the workshop.

[0056] In summary, by setting up a heating cover 2 and an infrared heating tube 3, when the chain claw 12 passes through the heating chamber 201 of the heating cover 2, the chain claw 12 is heated by the infrared heating tube 3. The power of the infrared heating tube 3 is set to heat the chain claw 12 to a specified temperature, so that when the chain claw 12 moves from the heating chamber 201 to the solder pool 101, the surface temperature of the chain claw 12 is close to the temperature of the solder. When the chain claw 12 comes into contact with the solder, the fluidity of the solder around the chain claw 12 is maintained, and the molten high-temperature solder is prevented from solidifying on the surface of the chain claw 12 due to a sudden drop in temperature when it comes into contact with the chain claw 12, thus forming solder slag.

[0057] By setting up a heat exchange chamber 21 and a fume hood 5, the fume hood 5 extracts the high-temperature fumes above the welding pool 101 and transports the high-temperature fumes into the heat exchange chamber 21. The heat from the heating hood 2 is used to further heat the high-temperature fumes. Finally, the high-temperature fumes are transported into the preheating chamber 202 to preheat the chain claw 12 that is about to enter the heating chamber 201. This reduces the energy consumption required for the infrared heating tube 3 to heat the chain claw 12 to the specified temperature, making full use of the heat from the infrared heating tube 3 and the high-temperature fumes to reduce energy consumption.

[0058] By setting an exhaust pipe 6 at the end of the preheating chamber 202 away from the heating chamber 201, and connecting the exhaust pipe 6 to an external centrifugal fan, since the second end of the first induced draft pipe 41 and the exhaust pipe 6 are located at opposite ends of the preheating chamber 202, and the air delivery direction of the second end of the first induced draft pipe 41 is towards the exhaust pipe 6 (e.g., Figure 6 As shown in the figure, the negative pressure suction of the exhaust pipe 6 allows the gas delivered by the first exhaust pipe 41 to the preheating chamber 202 to pass through the preheating chamber 202 and fully heat the chain claw 12. Then the gas is discharged through the exhaust pipe 6 to prevent the smoke from spreading in the workshop.

[0059] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0060] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A wave soldering machine for circuit board production, characterized in that, It includes a machine base (1) and two parallel conveying units (11). The machine base (1) has a welding pool (101) on its table surface, and the two conveying units (11) are located on both sides of the welding pool (101). The conveying unit (11) is provided with multiple evenly distributed chain claws (12) for supporting the circuit board. Among them, heating covers (2) are provided on opposite sides of the two conveying units (11), and heating chambers (201) are provided on the side of the heating cover (2) near the input end of the conveying unit (11), and infrared heating tubes (3) are provided in the heating chambers (201). The heating cover (2) has a preheating chamber (202) on the side near the output end of the conveying unit (11). The heating cover (2) has a heat exchange chamber (21) on the outside of the heating chamber (201). An air duct is provided between the heat exchange chamber (21) and the preheating chamber (202).

2. The wave soldering machine for circuit board production according to claim 1, characterized in that: Each of the two conveying units (11) is provided with a fume hood (5) on one side. One end of the fume hood (5) is provided with a second air duct (51). The two ends of the second air duct (51) are respectively connected to the fume hood (5) and the heat exchange chamber (21), so that the high temperature flue gas at the welding pool (101) is transported to the heat exchange chamber (21).

3. The wave soldering machine for circuit board production according to claim 2, characterized in that: The smoke inlet of the smoke collection hood (5) is provided with a dispersion plate (52), and the dispersion plate (52) is provided with a plurality of air intakes (501) for dispersing negative pressure.

4. The wave soldering machine for circuit board production according to claim 1, characterized in that: The heat exchange chamber (21) is provided with a plurality of heat-conducting fins (22) for increasing the heat exchange area, and the heat-conducting fins (22) are fixed on the heating cover (2).

5. The wave soldering machine for circuit board production according to claim 4, characterized in that: The multiple heat-conducting fins (22) are staggered to form a heat exchange channel in the heat exchange chamber (21).

6. The wave soldering machine for circuit board production according to claim 2, characterized in that: The air intake component includes an air intake fan (4) and a first air intake pipe (41). The first end of the first air intake pipe (41) is connected to the heat exchange chamber (21), and the second end of the first air intake pipe (41) extends into the preheating chamber (202). The air intake fan (4) is connected in series with the first air intake pipe (41).

7. The wave soldering machine for circuit board production according to claim 6, characterized in that: The first exhaust pipe (41) and the second exhaust pipe (51) are respectively connected to the two ends of the heat exchange chamber (21), so that the flue gas transported by the second exhaust pipe (51) can pass through the heat exchange chamber (21).

8. The wave soldering machine for circuit board production according to claim 6, characterized in that: The second end of the first air duct (41) is connected to the end of the preheating chamber (202) near the heating chamber (201), and the air delivery direction of the second end of the first air duct (41) is toward the end of the preheating chamber (202) away from the heating chamber (201).

9. The wave soldering machine for circuit board production according to claim 8, characterized in that: The preheating chamber (202) is provided with a smoke exhaust pipe (6) at one end away from the heating chamber (201), and the smoke exhaust pipe (6) is connected to an external centrifugal fan.

10. The wave soldering machine for circuit board production according to claim 1, characterized in that: The machine platform (1) is provided with a protective housing (100) on its platform.

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