Improved protective gas supply mechanism welding device

Abstract

The utility model provides an improved welding device for a protective gas supply mechanism, which belongs to the technical field of welding and comprises a tin furnace, a tin liquid outlet pipeline and a tin liquid driving device. The end, located in the tin bath, of the tin liquid pipeline is a liquid inlet, and the end, located outside the tin furnace, of the tin liquid pipeline is a liquid outlet. The tin liquid driving device comprises a driving motor, an impeller and a transmission shaft; the tin furnace is provided with a transmission shaft mounting cavity, the transmission shaft is at least partially arranged in the transmission shaft mounting cavity, and a bearing is clamped between the transmission shaft mounting cavity and the periphery of the transmission shaft; the device further comprises a protective gas inlet pipeline and a flow guide pipe. A gas inlet of the flow guide pipe is communicated with a protective gas inlet pipeline; the flow guide pipe is provided with a first air outlet which is communicated with the transmission shaft mounting cavity; and the flow guide pipe and / or the transmission shaft mounting cavity are / is provided with a second air outlet communicated with the inner cavity of the tin furnace. According to the welding device, through the structure, protective gas can effectively act on the bearing part, the temperature is reduced, meanwhile, the tin furnace is filled with the protective gas, and the performance of the welding device is improved.

Description

Technical Field

[0001] This utility model belongs to the field of welding technology, and more specifically, relates to a welding device with an improved protective gas supply mechanism. Background Technology

[0002] With the rapid development of modern electronic technology, the design and manufacturing of electronic components are trending towards high precision and miniaturization, and the wiring density of circuit boards has also increased significantly. Against this backdrop, automated soldering processes have become a core component of electronic product manufacturing, placing more stringent requirements on the precision and uniformity of solder. The solder melt drive device uses a motor to drive an impeller, propelling the molten solder in the solder bath towards the solder nozzle. The motor and impeller are connected by a drive shaft. Since the solder bath itself needs to continuously generate heat, and the drive shaft is made of metal, a significant amount of heat absorbed by the shaft in contact with the molten solder is transferred to the bearings it houses, causing excessively high bearing temperatures. This negatively impacts the bearings' stability and lifespan.

[0003] To address the aforementioned issue of excessively high bearing temperatures, those skilled in the art have employed a technique where protective gas is first introduced to the portion of the drive shaft not immersed in molten solder, thereby achieving localized cooling and reducing heat transfer from the drive shaft to the bearing. This also serves the function of filling the solder pot with protective gas. However, because the cooling area is not directly located within the bearing space, this method cannot prevent heat conduction from other structures in contact with the bearing, resulting in poor cooling performance. Furthermore, to achieve localized cooling and prevent heat transfer, a high gas flow rate is required, increasing the difficulty and cost of achieving this cooling effect. Therefore, providing a soldering device with a significantly effective gas-driven cooling system and a rationally designed structure is a pressing technical problem that needs to be solved in this field. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides a soldering device to solve the issues of poor cooling effect and unreasonable gas path structure in the prior art.

[0005] To achieve the above objectives, this utility model is accomplished by the following specific technical means:

[0006] An improved protective gas supply mechanism welding device includes a solder furnace, a molten solder outlet pipeline, and a molten solder driving device. The molten solder pipeline runs through the solder furnace, with one end inside the solder bath serving as the inlet and the other end outside the solder furnace serving as the outlet. The molten solder driving device drives the molten solder in the solder furnace to flow from the inlet to the outlet. The molten solder driving device includes a drive motor, an impeller, and a drive shaft connecting the output end of the drive motor and the impeller. The solder furnace has a drive shaft mounting cavity, and the drive shaft is at least partially disposed within the drive shaft mounting cavity. A bearing is sandwiched between the drive shaft mounting cavity and the drive shaft. The device also includes a protective gas inlet pipeline and a guide pipe. The inlet of the guide pipe is connected to the protective gas inlet pipeline. The guide pipe has a first outlet, which is connected to the drive shaft mounting cavity. The guide pipe and / or the drive shaft mounting cavity have a second outlet connected to the inner cavity of the solder furnace.

[0007] Compared with the prior art, the present invention has the following beneficial effects:

[0008] The protective gas flows through the protective gas inlet pipe to the guide pipe, and then through the guide pipe to the drive shaft mounting cavity where the bearing is located. The drive shaft mounting cavity or the guide pipe is equipped with a second outlet, either individually or simultaneously, connecting to the inner cavity of the solder pot. This allows the protective gas to flow precisely through the space where the bearing is located, while also serving the function of filling the solder pot with protective gas. Compared with existing technologies, the cooling effect is significant, and the gas path structure is simple and reasonable.

[0009] Furthermore, the guide tube is sleeved around the drive shaft, and a protective gas containment cavity is formed between the inner wall of the guide tube and the outer wall of the drive shaft. On the one hand, the protective gas can carry away the heat on the drive shaft by flowing in the protective gas containment cavity. On the other hand, a section of the drive shaft is isolated from the molten tin in the tin furnace to avoid direct contact between the drive shaft and the molten tin, thereby reducing the heat absorbed by the drive shaft from the molten tin.

[0010] Furthermore, the tin furnace is a sealed tin furnace, and the drive shaft mounting cavity is formed in the wall of the tin furnace. Generally, the drive motor is located in the space outside the tin furnace. The bearing is set at the position where the drive shaft passes through the wall of the tin furnace. The structure is reasonable, compact and space-saving. At the same time, the cooling position is set at this position, which effectively avoids the heat from being transferred to the transmission gears or even the drive components such as the motor in one step.

[0011] Furthermore, the first air outlet pipe wall extends into the drive shaft mounting cavity and is fitted around the bearing to provide more precise guidance for the gas flow and ensure the cooling effect.

[0012] Furthermore, the inner wall of the first air outlet is provided with a limiting flange, and the lower end face of the bearing abuts against the limiting flange, so that the bearing and the guide tube fit more tightly.

[0013] Furthermore, the protective gas inlet pipe penetrates the wall of the furnace body, and the guide pipe wall is provided with a connecting gas passage; one end of the connecting gas passage is connected to the inlet pipe, and the other end is connected to the inner cavity of the guide pipe, eliminating the need for a separate pipeline, resulting in a simple structure and easy processing and production.

[0014] Furthermore, the outer end face of the air inlet of the guide pipe abuts against the inner wall of the furnace body, and the position of the protective gas inlet pipe corresponds to the air inlet of the connecting gas path. By abutting the guide pipe against the inner wall of the furnace body, the connection of the pipeline can be achieved as much as possible, and the assembly is convenient.

[0015] Furthermore, the tin furnace includes a tin furnace body with an opening on one side and a cover that closes to the opening; the drive shaft mounting cavity is disposed on the cover. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the structure after the bearing and rotating shaft mounting cavity have been disassembled.

[0018] Figure 3 for Figure 2 Cross-sectional view of region AA in the middle;

[0019] Figure 4 for Figure 3 A magnified view of a portion of region a;

[0020] Figure 5 This is a cross-sectional view of the bearing of this utility model with an oil seal structure;

[0021] Figure 6 for Figure 5 A magnified view of a portion of region b.

[0022] In the diagram, the correspondence between component names and drawing numbers is as follows:

[0023] 11. Tin furnace body; 12. Impeller; 13. Drive shaft; 14. Bearing; 21. Protective gas inlet pipe; 22. Guide pipe; 31. First gas outlet; 32. Second gas outlet; 33. Limiting flange; 41. Drive shaft mounting cavity; 42. Protective gas receiving cavity; 43. Connecting gas passage. Detailed Implementation

[0024] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0025] Example:

[0026] like Figures 1 to 6As shown, this utility model provides an improved protective gas supply mechanism for welding, including a solder furnace, a molten solder outlet pipe, and a molten solder driving device. The solder furnace plays a crucial role in containing the molten solder within the entire device. The molten solder outlet pipe runs through the solder furnace, with one end inside the solder bath (the inlet) and the other end outside the furnace (the outlet). The molten solder driving device directs the molten solder within the furnace from the inlet to the outlet.

[0027] The molten solder driving device consists of a drive motor, an impeller 12, and a drive shaft 13. The drive motor serves as the power source, with its output end connected to the drive shaft 13, the other end of which is connected to the impeller 12. The solder furnace has a dedicated drive shaft mounting cavity 41 for mounting the drive shaft 13. At least a portion of the drive shaft 13 is housed within this drive shaft mounting cavity 41, and a bearing 14 is sandwiched between the drive shaft mounting cavity 41 and the outer periphery of the drive shaft 13 to ensure smooth rotation of the drive shaft 13.

[0028] In addition to the aforementioned components, the welding device is also equipped with a protective gas inlet pipe 21 and a guide pipe 22. The protective gas inlet pipe 21 is responsible for introducing protective gas and is connected to the guide pipe 22. Specifically, the inlet of the guide pipe 22 and the protective gas inlet pipe 21 are connected. The guide pipe 22 is provided with a first outlet 31, which is also connected to the drive shaft mounting cavity 41. Through the first outlet 31, the protective gas in the drive shaft mounting cavity 41 can be blown towards the bearing 14, which has the effect of local cooling of the bearing 14, reducing the impact of high temperature on the stability of the bearing 14, thereby extending the service life of the bearing 14, ensuring the stable rotation of the drive shaft 13, and maintaining the normal operation of the solder liquid drive device. Meanwhile, a second air outlet 32 ​​communicating with the inner cavity of the solder pot is provided on either the guide pipe 22 or the drive shaft mounting cavity 41, or one of them. In this way, after the protective gas enters the drive shaft mounting cavity 41, part of it can flow into the inner cavity of the solder pot through the second air outlet 32. At the same time, an oil seal structure can be made at the bearing 14, so that the drive shaft mounting cavity 41 is a relatively closed cavity. When the gas enters the drive shaft mounting cavity 41, it carries away the heat in the drive shaft mounting cavity 41 and enters the inner cavity of the solder pot through the second air outlet 32.

[0029] The guide tube 22 is sleeved around the drive shaft 13, forming a space between the inner wall of the guide tube 22 and the outer wall of the drive shaft 13. This space serves as a protective gas receiving cavity 42, within which the protective gas can flow and function through corresponding outlets. Simultaneously, the protective gas receiving cavity 42 also provides thermal insulation. The protective gas flowing within the cavity reduces heat conduction from the drive shaft 13 to the surrounding environment, thereby minimizing the adverse effects of heat on the bearing 14 and other components.

[0030] The solder pot is a sealed solder pot, a design that creates a relatively stable environment inside. The drive shaft mounting cavity 41 is located in the wall of the solder pot, allowing the drive shaft 13 to operate in an independent space while remaining connected to the main body of the solder pot. Because the solder pot needs to generate continuous heat, the sealed design reduces heat loss, maintains a suitable temperature for the molten solder, and ensures stable soldering operations. The sealed design also reduces the risk of outside air entering the solder pot and causing oxidation of the molten solder surface.

[0031] The wall of the first vent 31 extends into the drive shaft mounting cavity 41 and also surrounds the bearing 14. In this way, the protective gas flowing from the guide pipe 22 through the first vent 31 can directly act around the bearing 14. The protective gas can reduce the heat conducted to the bearing 14 after the drive shaft 13 contacts the molten solder, thus reducing the adverse effects of high temperature on the stability and lifespan of the bearing 14.

[0032] The inner wall of the first air outlet 31 has a limiting flange 33, and the lower end face of the bearing 14 abuts against the limiting flange 33. The limiting flange 33 can position the bearing 14 and ensure that it is fixed in position within the drive shaft mounting cavity 41. This helps to ensure the smooth rotation of the drive shaft 13, allowing the power of the drive motor to be smoothly transmitted to the impeller 12 through the drive shaft 13, ensuring the normal operation of the molten solder drive device, and pushing the molten solder in the tin furnace from the inlet to the outlet.

[0033] The protective gas inlet pipe 21 penetrates the wall of the furnace body. This structure allows the external protective gas to smoothly enter the furnace body while ensuring the furnace body's airtightness and reducing heat and gas leakage. A dedicated connecting gas passage 43 is provided in the wall of the guide pipe 22. One end of this connecting gas passage 43 is connected to the protective gas inlet pipe 21, and the other end leads to the inner cavity of the guide pipe 22, providing a channel for the protective gas to enter the guide pipe 22 from the inlet pipe, allowing the protective gas to flow along a predetermined path.

[0034] The outer end face of the inlet of the guide pipe 22, which connects to the gas passage 43, abuts against the inner wall of the furnace body, making the protective gas flow more smoothly into the gas passage 43. The inner wall of the furnace body also acts as a limiting force on the guide pipe 22, keeping the inlet of the gas passage 43 in a relatively fixed position. Simultaneously, the position of the protective gas inlet pipe 21 corresponds to the inlet of the gas passage 43, further ensuring that the protective gas flows accurately from the inlet pipe into the gas passage 43 and then into the guide pipe 22, preventing gas from erratic movement and ensuring the normal operation of the gas system.

[0035] The solder pot consists of a solder pot body 11 with an opening on one side and a cover that fits over the opening. This combination facilitates the installation, maintenance, and addition of molten solder. The drive shaft mounting cavity 41 is located on the cover, and the drive shaft 13 is installed within this cavity. The cover provides a support for the drive shaft mounting cavity 41, and when installing and disassembling the drive shaft 13 and related components, minimal manipulation of the entire solder pot body 11 is required, improving maintenance convenience. This also makes the solder pot's structural layout more rational, which is beneficial for the normal operation of the molten solder driving device and the effective functioning of the protective gas on related components.

[0036] The embodiments of this utility model are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the utility model to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical applications of this utility model, and to enable those skilled in the art to understand this utility model and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. An improved protective gas supply mechanism welding device, comprising a tin furnace, a tin liquid outlet pipeline and a tin liquid driving device; the tin liquid pipeline is arranged through the tin furnace, with one end in a tin tank as a liquid inlet and the other end outside the tin furnace as a liquid outlet; the tin liquid driving device drives the tin liquid in the tin furnace to flow from the liquid inlet to the liquid outlet; the tin liquid driving device comprises a driving motor, an impeller (12) and a transmission shaft (13) connected between the output end of the driving motor and the impeller (12); the tin furnace is provided with a transmission shaft mounting cavity (41), the transmission shaft (13) is at least partially arranged in the transmission shaft mounting cavity (41), and a bearing is clamped between the transmission shaft mounting cavity (41) and the periphery of the transmission shaft (13); characterized in that further comprising a protective gas inlet pipeline (21) and a flow guide pipe (22); the gas inlet of the flow guide pipe (22) communicates with the protective gas inlet pipeline (21); the flow guide pipe (22) is provided with a first gas outlet (31), and the first gas outlet (31) communicates with the transmission shaft mounting cavity (41); the flow guide pipe (22) and / or the transmission shaft mounting cavity (41) are provided with a second gas outlet (32) communicating with the inner cavity of the tin furnace.

2. The improved shielding gas supply mechanism welding apparatus as defined in claim 1, wherein: The flow guide pipe (22) is sleeved on the periphery of the transmission shaft (13), and a protective gas containing cavity (42) is formed between the inner wall of the flow guide pipe (22) and the outer wall of the transmission shaft (13).

3. The improved shielding gas supply mechanism welding apparatus as claimed in claim 1, wherein: The tin furnace is a closed tin furnace, and the transmission shaft mounting cavity (41) is formed in the wall portion of the tin furnace.

4. The improved shielding gas supply mechanism welding apparatus as claimed in claim 3, wherein: The pipe wall of the first gas outlet (31) extends into the transmission shaft mounting cavity (41) and is sleeved on the periphery of the bearing.

5. The improved shielding gas supply mechanism welding apparatus as claimed in claim 4, wherein: The inner pipe wall of the first gas outlet (31) is provided with a limiting protruding edge (33), and the lower end surface of the bearing abuts against the limiting protruding edge (33).

6. The improved shielding gas supply mechanism welding apparatus as claimed in claim 3, wherein: The protective gas inlet pipeline (21) penetrates through the wall portion of the furnace body, and the wall portion of the flow guide pipe (22) is provided with a communication passage (43); one end of the communication passage (43) communicates with the inlet pipeline, and the other end communicates with the inner cavity of the flow guide pipe (22).

7. The improved shielding gas supply mechanism welding apparatus as claimed in claim 6, wherein: The outer end surface of the gas inlet end of the communication passage (43) of the flow guide pipe (22) abuts against the inner wall of the furnace body, and the position of the protective gas inlet pipeline (21) corresponds to the gas inlet end of the communication passage (43).

8. The improved shielding gas supply mechanism welding apparatus as defined in claim 1 wherein: The tin furnace comprises a tin furnace body (11) with one side open and a cover body covering the opening; the transmission shaft mounting cavity (41) is arranged on the cover body.

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