Wave soldering furnace

Abstract

The utility model provides a wave crest tin soldering furnace which comprises a tin cylinder, a wave crest opening is formed in the top end of the tin cylinder, a stirring rotor is arranged in the tin cylinder and driven by a motor, the motor is arranged above the tin cylinder, a baffle is arranged between the stirring rotor and the wave crest opening, and the baffle is vertically arranged. The wave crest soldering tin furnace can effectively prevent tin slag from being involved into wave crests by fluctuation generated by the motor, meanwhile, normal operation of the motor cannot be interfered, the purity and the welding quality of soldering tin are remarkably improved, the production cost is reduced, and the production efficiency is improved. The baffle is reasonable in design and convenient to install, and the existing wave soldering furnace equipment cannot be greatly changed. And the position of the baffle plate is finely adjusted, so that the baffle plate can adapt to motors with different specifications and models.

Description

Technical Field

[0001] The utility model relates to the field of wave soldering tin furnace devices, in particular to a wave soldering tin furnace. Background Art

[0002] Wave soldering is the most commonly used soldering technology. The soldering speed of wave soldering is better than manual soldering, thus realizing the automation of PCB assembly. The wave soldering process is particularly suitable for soldering through-hole components with good spacing. Wave soldering melts the tin bar into liquid through a tin bath and uses a motor to stir to form a wave. Wave soldering requires spraying flux first, then soldering after preheating, and flowing back to the cooling zone.

[0003] When the PCB board enters the front end of the wave crest, the substrate and the pins are heated, and before leaving the wave crest, the entire PCB board is immersed in solder, that is, it is bridged by solder. At the moment the PCB board leaves the tail end of the wave crest, a small amount of solder adheres to the pad due to the wetting force, and due to surface tension, it shrinks to the minimum state with the lead as the center. At this time, the wetting force between the solder and the pad is greater than the cohesive force of the solder between the two pads, thereby forming a full and round solder joint. The excess solder on the PCB board leaving the tail of the wave crest falls back into the tin pot due to gravity.

[0004] The surface of the wave crest is covered with a layer of oxide scale, which remains static almost along the entire length of the solder wave. During the wave soldering process, the PCB board contacts the front surface of the tin wave, the oxide scale breaks, and the tin wave in front of the PCB board is pushed forward without wrinkles. The entire oxide scale moves at the same speed as the PCB board, and the tin liquid under the oxide scale completes the soldering of the PCB.

[0005] During the operation of the wave soldering furnace, the wave crest motor is responsible for driving the formation and stability of the wave crest. However, during the wave crest formation and tin liquid circulation, tin slag will be generated. If these tin slag are not handled in time, they may be drawn into the wave crest by the eddy current or fluctuation generated by the motor, thus affecting the purity of the solder and the welding quality. Utility Model Content

[0006] The utility model aims to provide a wave soldering furnace, which can prevent tin slag from being rolled into the wave crest, thereby improving the purity of solder and the welding quality.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A wave soldering furnace comprises a tin cylinder, a wave crest mouth is arranged at the top of the tin cylinder, a stirring rotor is arranged in the tin cylinder, the stirring rotor is driven by a motor, the motor is arranged above the tin cylinder, a baffle is arranged between the stirring rotor and the wave crest mouth, and the baffle is arranged vertically.

[0009] Furthermore, in the above-mentioned wave soldering furnace, the baffle is made of steel plate, and the baffle is perpendicular to both side walls of the tin cylinder in the width direction.

[0010] Furthermore, in the above-mentioned wave soldering furnace, two stirring rotors are provided, and the two stirring rotors are both located at one end of the tin cylinder in the length direction.

[0011] Furthermore, in the above-mentioned wave soldering furnace, a through hole is provided at the lower portion of the baffle.

[0012] Furthermore, in the above-mentioned wave soldering furnace, the length of the baffle is 300 mm-700 mm, and the distance between the end of the baffle and the side wall of the tin cylinder in the width direction is 0-10 mm.

[0013] Furthermore, in the above-mentioned wave soldering furnace, the height of the baffle is 100mm-500mm, the upper end of the baffle is higher than the liquid level in the tin cylinder, and the stirring rotor is located below the liquid level in the tin cylinder.

[0014] Furthermore, in the above-mentioned wave soldering furnace, the through holes are arranged in several rows at the lower part of the baffle, and each row is provided with several through holes. The distance between the upper end of the through holes in the top row and the upper end of the stirring rotor is >150mm, and the distance between the upper end of the through holes in the top row and the liquid level in the tin cylinder is less than or equal to 100mm.

[0015] Furthermore, in the above-mentioned wave soldering furnace, the cross-section of the through hole is polygonal or circular. When the through hole is polygonal, the side length of the through hole ranges from 0.5 mm to 50 mm. When the through hole is circular, the diameter of the through hole ranges from 0.1 mm to 100 mm.

[0016] Furthermore, in the above-mentioned wave soldering furnace, the wave soldering furnace also includes an iron frame, and the motor is placed on the iron frame.

[0017] Furthermore, in the above-mentioned wave soldering furnace, an adjustment plate is connected to the baffle, the baffle and the adjustment plate are an integrated structure, the adjustment plate is arranged horizontally, one end of the adjustment plate is connected to the top of the baffle, and the other end of the adjustment plate extends to the top of the iron frame, and a notch is arranged on the adjustment plate. The bolts pass through the notch and the iron frame in turn and are tightened with nuts to fix the position of the baffle; after loosening the nuts, the lateral position of the baffle can be adjusted, and the adjustment distance of the baffle is 0 to 30 mm.

[0018] It can be seen from the analysis that the utility model discloses a wave soldering furnace, which can effectively prevent the tin slag from being drawn into the wave by the wave generated by the motor, and will not interfere with the normal operation of the motor, significantly improve the purity and welding quality of the solder, reduce production costs, and improve production efficiency. The baffle is reasonably designed and easy to install, and will not cause major changes to the existing wave soldering furnace equipment. By fine-tuning the position of the baffle, the baffle can adapt to motors of different specifications and models. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation on the present invention. Among them:

[0020] Figure 1 It is a schematic cross-sectional structure diagram of an embodiment of the utility model.

[0021] Figure 2 It is a right side structural schematic diagram of an embodiment of the utility model.

[0022] Figure 3 It is a schematic diagram of the top structure of an embodiment of the utility model.

[0023] Explanation of the reference numerals: 1 tin cylinder; 2 wave crest mouth; 3 stirring rotor; 4 motor; 5 baffle; 6 through hole; 7 iron frame; 8 smooth wave crest mouth; 9 impact wave crest mouth; 10 adjustment plate; 11 bolt; 12 notch. DETAILED DESCRIPTION

[0024] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. Each example is provided by way of explanation of the present invention and does not limit the present invention. In fact, it will be clear to those skilled in the art that modifications and variations may be made in the present invention without departing from the scope or spirit of the present invention. For example, a feature shown or described as a part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desired that the present invention includes such modifications and variations within the scope of the appended claims and their equivalents.

[0025] In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention. The terms "connected", "connected" and "set" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components; they can be wired electrical connections, radio connections, or wireless communication signal connections. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0026] One or more examples of the utility model are shown in the attached drawings. The detailed description uses numbers and letters to refer to the features in the drawings. Similar or similar marks in the drawings and descriptions have been used to refer to similar or similar parts of the utility model. As used herein, the terms "first", "second", and "third" etc. are used interchangeably to distinguish one component from another, and are not intended to indicate the position or importance of individual components.

[0027] like Figures 1 to 3 As shown, according to an embodiment of the utility model, a wave soldering furnace is provided, such as Figure 1 As shown, the wave soldering furnace includes a tin cylinder 1, and a wave soldering port 2 is provided at the top of the tin cylinder 1. Figure 3 As shown, the wave crest opening 2 includes a smooth wave crest opening 8 and an impact wave crest opening 9, which are arranged side by side at the top of the tin cylinder 1. A stirring rotor 3 is arranged in the tin cylinder 1, and the stirring rotor 3 is driven by a motor 4. The motor 4 is arranged above the tin cylinder 1. A baffle 5 is arranged between the stirring rotor 3 and the wave crest opening 2, and the baffle 5 is vertically arranged on the outside of the motor 4. The baffle 5 is arranged between the stirring rotor 3 and the wave crest opening 2, which can effectively block the tin slag in the tin liquid and prevent the tin slag from being drawn into the wave crest by the fluctuation generated by the motor 4, thereby improving the purity and welding quality of the solder, reducing the production cost, and improving the production efficiency.

[0028] Furthermore, the baffle 5 is made of a high temperature resistant and corrosion resistant steel plate, and the baffle 5 is perpendicular to both side walls in the width direction of the tin cylinder 1. Two stirring rotors 3 are provided, and the two stirring rotors 3 are both located at one end of the tin cylinder 1 in the length direction.

[0029] Furthermore, a through hole 6 is provided at the lower part of the baffle 5. The through hole 6 is used for tin liquid reflux, and the through hole 6 can ensure the normal operation of the motor 4.

[0030] Furthermore, the length of the baffle 5 is 300mm-700mm, and the distance between the end of the baffle 5 and the side wall of the tin cylinder 1 in the width direction is 0-10mm. Such a setting can ensure that the baffle 5 blocks the tin slag, so that the tin slag cannot flow above the stirring rotor 3, and avoid the tin slag being drawn into the tin liquid to affect the welding quality. The width of the baffle 5 depends on the width inside the tin cylinder 1. In one embodiment of the utility model, the width of the baffle 5 is consistent with the width inside the tin cylinder 1, that is, the distance between the end of the baffle 5 and the side wall of the tin cylinder 1 in the width direction is 0mm.

[0031] Furthermore, the height of the baffle 5 depends on the thickness of the tin slag and the depth of the upper end of the stirring rotor 3. Figure 2 As shown, the height H of the baffle 5 is 100 mm-500 mm, the upper end of the baffle 5 is higher than the liquid level in the tin tank 1, and the stirring rotor 3 is located below the liquid level in the tin tank 1. Such a setting can effectively block the tin slag floating on the liquid surface of the baffle 5 without affecting the operation of the stirring rotor 3.

[0032] Furthermore, the through holes 6 are arranged in several rows at the lower part of the baffle 5, and each row is provided with several through holes 6, and the distance h between the upper end of the through holes 6 in the top row and the upper end of the stirring rotor 3 is greater than 150 mm. The distance between the upper end of the through holes 6 in the top row and the liquid surface in the tin cylinder 1 is less than or equal to 100 mm. Such an arrangement can ensure that there is sufficient tin liquid reflux above the stirring rotor 3, and the baffle 5 above the through holes 6 can effectively prevent tin slag. The arrangement of the through holes 6 can also filter the tin slag and buffer the reflux of the tin liquid.

[0033] Furthermore, the cross section of the through hole 6 is polygonal or circular, when the through hole 6 is polygonal, the side length of the through hole 6 ranges from 0.5mm to 50mm, when the through hole 6 is circular, the diameter of the through hole 6 ranges from 0.1mm to 100mm. Such a setting can ensure that there is enough tin liquid reflux above the stirring rotor 3.

[0034] Furthermore, the wave soldering furnace also includes an iron frame 7 , and the motor 4 is placed on the iron frame 7 , and the iron frame 7 can provide stable support for the motor 4 .

[0035] Furthermore, an adjustment plate 10 is connected to the baffle 5. The baffle 5 and the adjustment plate 10 are an integrated structure. The adjustment plate 10 is arranged horizontally. One end of the adjustment plate 10 is connected to the top of the baffle 5. The other end of the adjustment plate 10 extends to the top of the iron frame 7. A notch 12 is arranged on the adjustment plate 10. The bolt 11 passes through the notch 12 and the iron frame 7 in turn and is locked with a nut to fix the position of the baffle 5. After loosening the nut, the lateral position of the baffle 5 can be adjusted to make the baffle 5 close to or away from the motor 4. The adjustment distance of the lateral position of the baffle 5 is 0 to 30 mm. For example, by fine-tuning the lateral position of the baffle 5, the baffle 5 can adapt to motors 4 of different specifications and models.

[0036] In one embodiment of the utility model, a baffle plate 5 made of stainless steel with a width of 360 mm and a height of 200 mm is installed in a tin cylinder 1 with a width of 360 mm, and a plurality of through holes 6 with a diameter of 10 mm are made on the baffle plate 5 100 mm below the liquid level to play a role in the reflux of the tin liquid.

[0037] In another embodiment of the utility model, a baffle plate 5 made of stainless steel with a width of 340 mm and a height of 200 mm is installed in a tin cylinder 1 with a width of 360 mm, and a plurality of through holes 6 with a diameter of 10 mm are made on the baffle plate 5 100 mm below the liquid level to facilitate the reflux of the tin liquid.

[0038] Before the wave soldering furnace is put into operation, a suitable baffle 5 is first selected according to the specifications and models of the motor 4, and then the baffle 5 is installed on the outside of the motor 4 through the bolts 11. Then the position of the baffle 5 is adjusted to ensure that the baffle 5 can block the tin slag on the surface of the tin liquid from entering the top of the stirring rotor 3. Finally, the wave soldering furnace is started to perform normal welding operations.

[0039] From the above description, it can be seen that the above embodiments of the utility model achieve the following technical effects:

[0040] A wave soldering furnace can effectively prevent tin slag from being drawn into the wave crest by the wave generated by the motor 4, and will not interfere with the normal operation of the motor 4, significantly improve the purity and welding quality of the solder, reduce production costs, and improve production efficiency. The baffle 5 is reasonably designed and easy to install, and will not cause major changes to the existing wave soldering furnace equipment. By fine-tuning the position of the baffle 5, the baffle 5 can adapt to motors 4 of different specifications and models.

[0041] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A wave soldering furnace, characterized in that: It includes a tin cylinder, the top of which is provided with a wave crest opening. A stirring rotor is provided in the tin cylinder. The stirring rotor is driven by a motor. The motor is arranged above the tin cylinder. A baffle is provided between the stirring rotor and the wave crest. The baffle is arranged vertically.

2. The wave soldering furnace according to claim 1, characterized in that: The baffle is made of steel plate, and the baffle is perpendicular to two side walls of the tin cylinder in the width direction.

3. The wave soldering furnace according to claim 1, characterized in that: The stirring rotors are provided with two, The two stirring rotors are both located at one end of the tin cylinder in the length direction.

4. The wave soldering furnace according to claim 1, characterized in that: A through hole is arranged at the lower part of the baffle.

5. The wave soldering furnace according to claim 1, characterized in that: The length of the baffle is 300mm-700mm, The distance between the end of the baffle and the side wall of the tin cylinder in the width direction is 0 to 10 mm.

6. The wave soldering furnace according to claim 1, characterized in that: The height of the baffle is 100mm-500mm. The upper end of the baffle is higher than the liquid level in the tin cylinder. The stirring rotor is located below the liquid level in the tin cylinder.

7. The wave soldering furnace according to claim 4, characterized in that: The through holes are arranged in a plurality of rows at the lower part of the baffle, and each row is provided with a plurality of the through holes. The distance between the upper end of the through holes in the top row and the upper end of the stirring rotor is >150 mm. The distance between the upper ends of the through holes in the top row and the liquid level in the tin cylinder is less than or equal to 100 mm.

8. The wave soldering furnace according to claim 4, characterized in that: The cross section of the through hole is polygonal or circular, When the through hole is a polygon, the side length of the through hole ranges from 0.5 mm to 50 mm. When the through hole is circular, the diameter of the through hole ranges from 0.1 mm to 100 mm.

9. The wave soldering furnace according to claim 1, characterized in that: The wave soldering furnace also includes an iron frame, and the motor is placed on the iron frame.

10. The wave soldering furnace according to claim 9, characterized in that: An adjustment plate is connected to the baffle, the baffle and the adjustment plate are an integrated structure, the adjustment plate is arranged horizontally, one end of the adjustment plate is connected to the top of the baffle, and the other end of the adjustment plate extends to the top of the iron frame, a notch is arranged on the adjustment plate, and a bolt passes through the notch and the iron frame in turn and is locked with a nut, thereby fixing the position of the baffle; After loosening the nut, the lateral position of the baffle can be adjusted, and the adjustment distance of the baffle is 0 to 30 mm.

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