A tinning chamber using a curtain of air for insulation

Abstract

This invention discloses a tin plating chamber with air curtain isolation, comprising a tin plating chamber cavity, a tin pool disposed within the tin plating chamber cavity, and inlet and outlet channels for copper wires to pass through and exit. A heat exchanger is installed on the tin plating chamber cavity. An air curtain isolation mechanism is respectively provided at the inlet and outlet channels. Each air curtain isolation mechanism includes a primary air curtain structure located outside the channel and a secondary air curtain structure located inside the channel, and both the primary and secondary air curtain structures are connected to the heat exchanger. A negative pressure collection mechanism is also provided within the tin plating chamber cavity. This negative pressure collection mechanism includes an inlet-side collection port, an upper collection port of the tin pool, and an outlet-side collection port arranged sequentially along the copper wire travel direction. The inlet-side collection port and the upper collection port of the tin pool are connected to a negative pressure fan, and the negative pressure fan is connected to the heat exchanger. This invention converts the originally directly discharged waste heat into energy for airflow through the air curtain, achieving effective utilization of waste heat resources.

Description

Technical Field

[0001] This invention relates to the field of metal wire surface treatment technology, and in particular to a tin plating chamber with air curtain isolation. Background Technology

[0002] In the copper wire tin plating process, the copper wire needs to continuously pass through a tin bath containing molten tin. The working temperature of the tin bath is usually between 240℃ and 280℃. Under these temperature conditions, a mixture of harmful gases containing tin vapor, flux volatiles, and trace amounts of acidic gases will be generated on the surface of the molten tin. Most existing tin plating chambers are open or semi-open structures, and harmful gases are prone to escape from the copper wire at the inlet and outlet of the tin plating chamber. In order to prevent harmful gases from escaping into the production workshop and affecting the health of operators and the ambient air quality, the existing technology usually adopts the following solution: a negative pressure exhaust device is installed above the open tin bath to collect harmful gases, and an air curtain device is installed at the inlet and outlet of the copper wire in the tin plating chamber to form an air curtain barrier using high-speed airflow to block the harmful gases from escaping.

[0003] However, existing negative pressure exhaust devices directly discharge the high-temperature gas above the tin bath into the waste gas treatment system. A considerable proportion of the heat consumed in heating the tin bath is ineffectively discharged. At the same time, the negative pressure exhaust device and the air curtain device operate independently, with their functions being disconnected. When the negative pressure exhaust intensity is too high, the airflow ejected from the air curtain is directly sucked into the negative pressure collection port before it can form an effective barrier, which can easily cause airflow short circuits and significantly weaken the sealing and isolation effect of the air curtain.

[0004] To address this issue, we propose a tin plating chamber with air curtain isolation. Summary of the Invention

[0005] The purpose of this invention is to provide a tin plating chamber with air curtain isolation to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A tin plating chamber with air curtain isolation includes a tin plating chamber cavity, a tin pool disposed in the tin plating chamber cavity, and an inlet channel and an outlet channel for copper wires to pass through and exit. A sealed door is installed on one outer wall of the tin plating chamber cavity, and a transparent observation window is installed on the other outer wall. A heat exchanger is installed on the tin plating chamber cavity. A set of air curtain isolation mechanisms is provided at the inlet channel and the outlet channel respectively. Each set of air curtain isolation mechanisms includes a primary air curtain structure located on the outside of the channel and a secondary air curtain structure located on the inside of the channel. The primary air curtain structure and the secondary air curtain structure are respectively connected to the cold source gas outlet of the heat exchanger through a primary gas source transmission pipeline and a secondary gas source transmission pipeline. The tin plating chamber is also equipped with a negative pressure collection mechanism, which includes an inlet-side collection port, an upper pool collection port, and an outlet-side collection port arranged sequentially along the copper wire travel direction. The inlet-side collection port, the upper pool collection port, and the outlet-side collection port are connected to a negative pressure fan through an inlet-side negative pressure pipe, an upper pool negative pressure pipe, and an outlet-side negative pressure pipe, respectively. The negative pressure fan is connected to the heat source gas inlet of the heat exchanger.

[0007] In a further embodiment, the heat exchanger includes an insulated shell. One outer wall of the insulated shell has a heat source inlet, and the other symmetrical outer wall has a heat source exhaust outlet. The interior of the insulated shell is divided into two relatively independent primary and secondary air source heat exchange chambers by a partition. The inlet of the primary air source heat exchange chamber is connected to a primary air source external pipe, and the outlet of the primary air source heat exchange chamber is connected to a primary air source transmission pipeline. The inlet of the secondary air source heat exchange chamber is connected to a secondary air source external pipe, and the outlet of the secondary air source heat exchange chamber is connected to a secondary air source transmission pipeline. A flow guide is installed at both the heat source inlet and the heat source exhaust outlet. Several heat exchange tubes are installed between the two flow guides in a matrix arrangement, and a heat exchange grid plate is fixed outside the heat exchange tubes.

[0008] In a further embodiment, solenoid valves are installed on both the primary gas source external connector and the secondary gas source external connector.

[0009] In a further embodiment, the primary air curtain structure uses dry and clean compressed air as the air source, and the bottom of the primary air curtain structure is provided with a primary air curtain outlet, which is set at an inward tilt angle of -° relative to the channel axis; the secondary air curtain structure uses inert gas as the air source, and the bottom of the secondary air curtain structure is provided with a secondary air curtain outlet, which is set at an angle of -° relative to the channel axis.

[0010] In a further embodiment, the air curtain outlet and the corresponding negative pressure collection port in each air curtain isolation mechanism are arranged in a staggered manner in space to form a swirling airflow that wraps around the surface of the copper wire in the channel.

[0011] In a further embodiment, in the negative pressure collection mechanism, the negative pressure values ​​of the inlet-side collection port and the outlet-side collection port are less than the negative pressure value of the negative pressure pipe above the pool.

[0012] In a further embodiment, an arc-shaped guide plate is symmetrically installed between the upper collection port of the pool and directly above the tin pool, and the radius of curvature of the arc-shaped guide plate gradually decreases along the airflow direction.

[0013] In a further embodiment, air volume regulating valves are installed on each air source transmission pipe of the air curtain isolation mechanism and on each negative pressure pipe of the negative pressure collection mechanism.

[0014] In a further embodiment, a control unit is also included, which includes a controller and a gas sensor group and a pressure sensor group disposed in the tin plating chamber. The controller receives the detection signals from the gas sensor group and the pressure sensor group, and dynamically adjusts the opening degree of each air volume regulating valve and the power of the negative pressure fan accordingly, so as to maintain a slightly negative pressure state in the tin plating chamber.

[0015] Compared with the prior art, the beneficial effects of the present invention are: This invention employs a dual-stage air curtain isolation, gradient negative pressure collection, and waste heat recovery design. The waste heat recovery uses the heat from the waste gas collected by the negative pressure to preheat the air curtain air source, enhancing the airtightness of the air curtain jet. The heated air curtain airflow reduces cold interference to the temperature inside the chamber, thus reducing waste heat loss. The dual-stage air curtain can suppress the scattered flow of harmful gases and guide their directional flow to improve collection efficiency. The gradient negative pressure collection can also guide the nitrogen air curtain flow to cover the tin pool, inhibiting the oxidation of the molten tin. This creates a synergistic effect where multiple structures complement each other.

[0016] This invention introduces high-temperature waste gas collected under negative pressure into the heat source side of a heat exchanger, which is then used to preheat the intake air of the first and second stage air curtains. This converts the waste heat that was originally directly discharged into the energy of the air curtain, reduces the disturbance of the temperature field inside the tin plating chamber by the air curtain, significantly reduces the energy consumption for heating the tin bath and preheating the air curtain gas, and realizes the effective utilization of waste heat resources.

[0017] This invention employs a dual-stage air curtain design. The outer primary air curtain uses clean air to form initial isolation, while the inner secondary air curtain uses inert gas. The inert gas ejected from the secondary air curtain forms a stable air cushion layer between the inner wall of the tin plating chamber and the tin bath, reducing the oxygen partial pressure on the surface of the tin liquid to a low level, effectively inhibiting the generation of tin dross and improving the utilization rate of tin.

[0018] This invention creates a gradient negative pressure field along the copper wire's travel direction by setting up collection ports on the inlet side, the upper part of the pool, and the outlet side. Combined with the arc-shaped guide plate with gradually changing curvature on the upper part of the pool, the harmful gases volatilized from the molten tin are smoothly guided to the collection ports by utilizing the fluid adhesion effect. This avoids the irregular diffusion of gases above the tin pool, reduces the dead zone of the eddy, and effectively improves the collection efficiency of harmful gases.

[0019] This invention uses a staggered arrangement of the air curtain outlet and the negative pressure collection port to create a swirling flow that wraps around the copper wire during the collection process. This effectively removes the liquid tin droplets that are unevenly attached to the surface of the copper wire when it exits the tin pool, allowing the air curtain device to also have the function of homogenizing the tin layer of a traditional air knife device. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the front structure of the present invention; Figure 2 This is a schematic diagram of the rear structure of the present invention; Figure 3 This is a schematic diagram of the internal front structure of the present invention; Figure 4 This is a schematic diagram of the internal rear structure of the present invention; Figure 5 This is a schematic diagram of the internal structure of the heat exchanger of the present invention; Figure 6 This is a framework diagram of the control system of the present invention.

[0021] In the diagram: 1. Tin plating chamber; 11. Inlet channel; 12. Outlet channel; 13. Sealed door; 14. Transparent observation window; 2. Tin pool; 3. Air curtain isolation mechanism; 31. Primary air curtain structure; 311. Primary air source transmission pipeline; 312. Primary air curtain outlet; 32. Secondary air curtain structure; 321. Secondary air source transmission pipeline; 322. Secondary air curtain outlet; 4. Negative pressure collection mechanism; 41. Inlet side collection port; 411. Inlet side negative pressure pipeline; 42. Upper collection port of the pool; 421. Upper negative pressure pipeline of the pool; 422. Arc-shaped guide plate; 43. 431. Outlet side collection port; 44. Negative pressure pipe on the outlet side; 5. Air volume regulating valve; 6. Heat exchanger; 61. Insulation shell; 611. Heat source air inlet; 612. Heat source exhaust port; 613. Baffle; 62. Flow guide; 63. Heat exchange tube; 64. Heat exchange grid plate; 65. Primary air source heat exchange chamber; 66. Secondary air source heat exchange chamber; 7. Secondary air source external pipe; 8. Primary air source external pipe; 81. Air filter; 9. Solenoid valve; 10. Control unit; 101. Controller; 102. Gas sensor group; 103. Pressure sensor group. Detailed Implementation

[0022] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the 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, and therefore should not be construed as a limitation of the invention. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0023] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Please see Figure 1-5 A tin plating chamber with air curtain isolation includes a tin plating chamber cavity 1, which can be welded from stainless steel plate, and has excellent corrosion resistance and structural strength. The internal space dimensions of the tin plating chamber cavity 1 are designed according to the production line capacity. A sealing door 13 is installed on the back outer wall of the tin plating chamber cavity 1 by heavy-duty hinges. The sealing door 13 is inlaid with high-temperature resistant silicone sealing strips around its perimeter. After closing, it is locked to the cavity by a pressure-type door lock to ensure no gas leakage under negative pressure. The sealed door 13 is used for cleaning the tin bath, inspecting components, and threading operations when the equipment is shut down. On the outer wall of the tin plating chamber 1 on the opposite side of the sealed door 13, a rectangular window is provided and a transparent observation window 14 is installed. The observation window is preferably a double-layer laminated tempered glass structure with an air insulation layer between the two layers of glass to prevent the outer surface temperature from being too high and burning the operator, while also preventing the inner surface from fogging due to tin vapor condensation. Through the observation window, the operator can monitor the liquid level of the tin bath 2, the status of the copper wire routing, and the operation of the gas guiding structure in real time without opening the sealed door 13. The left and right side walls of the tin plating chamber 1 are symmetrically provided with inlet channels 11 and outlet channels 12. Both inlet channels 11 and outlet channels 12 are slit-shaped openings that penetrate the wall thickness of the tin plating chamber 1. In order to avoid gas short circuits and maintain the rigidity of the air curtain, the cross-sectional dimensions of the channels are set such that the slit height is 2 to 5 times the diameter of the copper wire and the slit width is 3 to 8 times the diameter of the copper wire.

[0026] A heat exchanger 6 is fixedly installed on the top of the tin-plating chamber 1 via a bracket. Its specific structure includes an insulated shell 61, a flow guide 62, heat exchange tubes 63, and a heat exchange grid plate 64. The insulated shell 61 uses a double-layer stainless steel plate structure with aluminum silicate insulation cotton filling the middle to minimize heat radiation loss. A heat source inlet 611 is located on one side of the outer wall of the shell, and a heat source exhaust outlet 612 is located on the opposite side, connecting to a subsequent waste gas treatment device. A vertical baffle 613 is welded inside the shell to separate the cold source side... The system is strictly divided into a primary air source heat exchange chamber 65 and a secondary air source heat exchange chamber 66, ensuring that compressed air and nitrogen do not cross-contaminate during the preheating process and guaranteeing the purity of the inert gas in the secondary air curtain. The inlet of the primary air source heat exchange chamber 65 is connected to the primary air source external pipe 8 for introducing compressed air. An air filter 81 can also be installed on the pipe of the primary air source external pipe 8 to obtain a cleaner air source. The inlet of the secondary air source heat exchange chamber 66 is connected to the secondary air source external pipe 7 for introducing inert gas, such as nitrogen.

[0027] A horn-shaped flow guide shroud 62 is installed at both the air inlet and outlet of the insulation shell 61. The large end of the flow guide shroud 62 covers the entire cross-section of the heat exchange tube bundle, which is used to evenly distribute the airflow to each heat exchange tube 63 and avoid local flow velocities that are too high or too low. The heat exchange tubes 63 are made of copper tubes or 316L stainless steel corrugated tubes with high thermal conductivity and corrosion resistance. Several heat exchange tubes 63 are evenly arranged in a matrix, with gaps left between the tubes for gas flow. In order to enhance the airflow disturbance on the cold source side, a multi-layer aluminum heat exchange grid plate 64 is transversely inserted on the outside of the heat exchange tubes 63. The surface of the grid plate is stamped with louvered fin openings. When the cold air / nitrogen flow in the primary air source heat exchange chamber 65 and the secondary air source heat exchange chamber 66 passes through the grid plate, the airflow is continuously cut and turned, which destroys the laminar boundary layer near the tube wall, thereby improving the heat exchange efficiency.

[0028] Above the inlet channel 11 and the outlet channel 12, a set of air curtain isolation mechanisms 3 are fixedly installed. Each air curtain isolation mechanism 3 includes a primary air curtain structure 31 and a secondary air curtain structure 32. The primary air curtain structure 31 is located on the outermost side of the channel, closer to the atmospheric environment. The primary air curtain structure 31 has a narrow, elongated pressure equalization cavity inside. Its top is connected to the outlet of the primary air source heat exchange cavity 65 of the heat exchanger 6 via a primary air source transmission pipe 311. Each air source transmission pipe of the air curtain isolation mechanism 3 is equipped with an airflow regulating valve 5. The bottom of the primary air curtain structure 31 has a primary air curtain outlet 312, which is a continuous slit-shaped outlet covering the entire width of the channel. The jet axis of the primary air curtain outlet 312 forms a directional angle with the vertical axis of the inlet channel 11. The tin plating chamber 1 has an incline angle, preferably within the range of 5-15°, which allows the inward tilt design to guide some dry air into the chamber to balance the negative pressure suction volume, while also using the airflow to prevent the internal gas from rushing outwards. The secondary air curtain structure 32 is located inside the channel and also has a pressure equalization chamber inside. Its top is connected to the outlet of the secondary air source heat exchange chamber 66 of the heat exchanger 6 through the secondary air source transmission pipe 321. The bottom of the secondary air curtain structure 32 has a secondary air curtain outlet 322, which is also a continuous slit shape, but slightly wider than the primary air curtain, so as to spray out a larger flow of protective gas. The jet axis of the secondary air curtain outlet 322 is at a basically perpendicular angle to the channel axis, that is, the airflow is almost horizontally sprayed, forming a dense laminar flow of inert gas.

[0029] The tin plating chamber 1 is also equipped with a negative pressure collection mechanism 4. This mechanism not only passively extracts harmful gases but also actively creates a balanced gas flow field. Specifically, the negative pressure collection mechanism 4 includes an inlet-side collection port 41, an upper pool collection port 42, and an outlet-side collection port 43 arranged sequentially along the copper wire's travel direction. The inlet-side collection port 41, the upper pool collection port 42, and the outlet-side collection port 43 are respectively connected to a negative pressure fan 44 via an inlet-side negative pressure pipe 411, an upper pool negative pressure pipe 421, and an outlet-side negative pressure pipe 431. The negative pressure fan 44 is connected to the heat source gas inlet of the heat exchanger 6. Each negative pressure pipeline is equipped with an air volume regulating valve 5. The negative pressure fan 44 is a variable frequency high-pressure centrifugal fan. By adjusting the opening of the air volume regulating valve 5 on each branch, the negative pressure gradient is reduced. For example, the opening of the air volume regulating valve 5 at the outlet collection port 43 is 65%, and the measured static pressure value is -55Pa; the opening of the air volume regulating valve 5 at the upper collection port 42 is 90%, and the measured static pressure value is -85Pa; the opening of the air volume regulating valve 5 at the inlet collection port 41 is 65%, and the measured static pressure value is -55Pa. This creates a pressure difference distribution with weak pressure at the inlet and outlet and strong pressure in the middle, which can force the gas in the cavity to flow towards the middle of the cavity.

[0030] Two arc-shaped guide plates 422 are symmetrically installed between the upper collection port 42 and the surface of the tin pool 2. These guide plates are made of mirror-polished stainless steel to reduce tin vapor condensation and adhesion to the walls. The radius of curvature of the arc-shaped guide plates 422 gradually decreases along the airflow direction to facilitate airflow. For example, the end of the guide plate near the inlet channel 11 or outlet channel 12 has a radius of curvature R1=600mm and a gentle curvature to facilitate airflow. The end of the guide plate near the upper collection port 42 has a radius of curvature R2=200mm and a sharply contracted curvature, so that the airflow obtains a velocity component pointing towards the center of the upper collection port 42 when it leaves the edge of the guide plate, which facilitates guiding the airflow into the negative pressure range of the upper collection port 42.

[0031] In order to form a wrapping blowing effect on the surface of the copper wire in the channel, taking the inlet channel 11 as an example: the primary air curtain outlet 312 and the secondary air curtain outlet 322 are both located on the top left side of the channel. The inlet side collection port 41 of the negative pressure collection mechanism 4, which corresponds to the air curtain isolation mechanism 3, is set on the right side wall at the bottom of the channel. When the airflow is ejected at high speed from the top left side and reaches the bottom of the channel, the airflow is deflected in the channel due to the negative pressure attraction of the inlet side collection port 41 on the right side, forming a counterclockwise longitudinal vortex. This vortex can surround the surface of the copper wire 360° and evenly blow back the excess liquid tin droplets adhering to the surface of the copper wire when it exits the tin pool or blow them off for collection.

[0032] Solenoid valves 9 are installed on the primary gas source external pipe 8 connecting the primary gas source heat exchange chamber 65 and the secondary gas source external pipe 7 connecting the secondary gas source heat exchange chamber 66. The solenoid valve 9 is normally closed and interlocked with the whole machine control system. When the equipment stops or a fault alarm occurs, the control unit 10 can instantly cut off the solenoid valve 9 to stop the gas supply, so as to save gas and prevent gas backflow.

[0033] like Figure 6 As shown, in order to ensure the stability of the micro-negative pressure state in the entire chamber, a control unit 10 is also set up. The control unit 10 adopts the PID control algorithm and mainly includes a controller 101, a gas sensor group 102 and a pressure sensor group 103. The controller 101 adopts a Siemens S7-1200 series PLC. The gas sensor group 102 uses a semiconductor tin vapor concentration sensor and a PID photoionization VOCs sensor to monitor the changes in tin vapor and VOCs concentration. The pressure sensor group 103 uses a micro differential pressure transmitter with a range of -200Pa to +200Pa and is installed on the side wall of the central area of ​​the tin plating chamber 1.

[0034] Working principle: After the negative pressure fan 44 starts, it draws out the harmful gas containing a large amount of heat from the tin plating chamber 1 through each collection port. This high-temperature waste gas enters the heat source inlet 611 of the heat exchanger 6 through the pipeline and flows into the interior of the matrix-distributed heat exchange tubes 63. At the same time, compressed air is introduced through the primary air source external pipe 8 and nitrogen is introduced through the secondary air source external pipe 7. When the high-temperature waste gas flows in the heat exchange tubes 63, it transfers heat to the cold source gas flowing through the primary air source heat exchange chamber 65 and the secondary air source heat exchange chamber 66 through the pipe wall and the external heat exchange grid plate 64. The preheated compressed air and nitrogen are transported to the air curtain isolation mechanism 3 through the primary air source transmission pipeline 311 and the secondary air source transmission pipeline 321, respectively. This process realizes efficient recovery of waste heat and reduces the heat load of subsequent waste gas treatment and the heating energy consumption of the air curtain.

[0035] The preheated clean compressed air is ejected inward at an angle from the outlet 312 of the first-stage air curtain, forming the first high-speed air curtain, which mainly blocks the intrusion of ambient air from outside the cavity and the direct ejection of internal gas. The preheated nitrogen is ejected at a vertical angle from the outlet 322 of the second-stage air curtain, forming the second high-density inert gas barrier. Since the density of nitrogen is slightly lower than that of air and it has good fluidity in the preheated state, the nitrogen curtain not only blocks the tin vapor from escaping but also diffuses into the inside of the cavity, forming a protective inert atmosphere layer above the surface of the tin pool 2, which significantly inhibits the high-temperature oxidation reaction of the tin liquid.

[0036] During the ascent of the tin-containing gas volatilized from the surface of the tin pool 2, it is constrained by the arc-shaped guide plate 422 and flows along the plate surface according to the Coanda effect. It is smoothly guided to the upper collection port 42 of the pool. Since the air curtain outlet and the bottom collection port are arranged in a staggered manner, the air curtain airflow forms a vortex when it reaches the bottom of the channel, which wraps and blows the surface of the copper wire 360° to remove excess tin liquid. After that, the airflow carrying trace amounts of volatiles is immediately sucked away by the nearest negative pressure collection port.

[0037] During operation, if the pressure sensor group 103 detects a tendency for the air pressure inside cavity 1 to become positive, the controller 101 will simultaneously increase the frequency of the negative pressure fan 44 or decrease the opening of the airflow regulating valve 5 on the air curtain side; conversely, if the negative pressure is too strong, causing a large amount of external air to be drawn in, the controller will increase the opening of the valve on the air curtain side to supplement the intake air volume. If the gas sensor group 102 detects an abnormal increase in the concentration of tin vapor, the controller 101 will prioritize increasing the nitrogen supply of the secondary air curtain structure 32 and the exhaust volume of the upper collection port 42 of the pool to reduce the escape of harmful gases.

[0038] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0039] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A tin plating chamber with air curtain isolation, comprising a tin plating chamber cavity (1), a tin pool (2) disposed within the tin plating chamber cavity (1), and an inlet channel (11) and an outlet channel (12) for copper wires to pass through and exit, characterized in that: A sealed door (13) is installed on one side of the outer wall of the tin plating chamber (1), and a transparent observation window (14) is installed on the other side of the outer wall. A heat exchanger (6) is installed on the tin plating chamber (1). A set of air curtain isolation mechanisms (3) is provided at the inlet channel (11) and the outlet channel (12). Each set of air curtain isolation mechanisms (3) includes a primary air curtain structure (31) located outside the channel and a secondary air curtain structure (32) located inside the channel. The primary air curtain structure (31) and the secondary air curtain structure (32) are connected to the cold source gas outlet of the heat exchanger (6) through the primary gas source transmission pipeline (311) and the secondary gas source transmission pipeline (321), respectively. The tin plating chamber (1) is also equipped with a negative pressure collection mechanism (4). The negative pressure collection mechanism (4) includes an inlet side collection port (41), an upper pool collection port (42), and an outlet side collection port (43) arranged sequentially along the copper wire travel direction. The inlet side collection port (41), the upper pool collection port (42), and the outlet side collection port (43) are connected to a negative pressure fan (44) through an inlet side negative pressure pipe (411), an upper pool negative pressure pipe (421), and an outlet side negative pressure pipe (431), respectively. The negative pressure fan (44) is connected to the heat source gas inlet of the heat exchanger (6).

2. The tin plating chamber with air curtain isolation according to claim 1, characterized in that: The heat exchanger (6) includes an insulated shell (61). One outer wall of the insulated shell (61) has a heat source inlet (611), and the other symmetrical outer wall has a heat source exhaust outlet (612). The interior of the insulated shell (61) is divided into two relatively independent primary air source heat exchange chambers (65) and secondary air source heat exchange chambers (66) by a partition (613). The inlet side of the primary air source heat exchange chamber (65) is connected to a primary air source external pipe (8), and the outlet side of the primary air source heat exchange chamber (65)... The secondary gas source heat exchange chamber (66) is connected to the primary gas source transmission pipeline (311). The inlet side of the secondary gas source heat exchange chamber (66) is connected to the secondary gas source external pipe (7), and the outlet side of the secondary gas source heat exchange chamber (66) is connected to the secondary gas source transmission pipeline (321). A guide shroud (62) is installed at both the heat source inlet (611) and the heat source outlet (612). Several heat exchange tubes (63) are installed between the two guide shrouds (62) in a matrix distribution, and a heat exchange grid plate (64) is fixed outside the heat exchange tubes (63).

3. A tin plating chamber with air curtain isolation according to claim 2, characterized in that: Solenoid valves (9) are installed on the pipelines of the primary gas source external connector (8) and the secondary gas source external connector (7).

4. A tin plating chamber with air curtain isolation according to claim 1, characterized in that: The primary air curtain structure (31) uses dry and clean compressed air as the air source, and the bottom of the primary air curtain structure (31) is provided with a primary air curtain outlet (312), which is set at an inward tilt angle of 5-15° relative to the channel axis; the secondary air curtain structure (32) uses inert gas as the air source, and the bottom of the secondary air curtain structure (32) is provided with a secondary air curtain outlet (322), which is set at an angle of 80-90° relative to the channel axis.

5. A tin plating chamber with air curtain isolation according to claim 4, characterized in that: In each group of air curtain isolation mechanisms (3), the air curtain outlet and the corresponding negative pressure collection port are arranged in a staggered manner in space to form a swirling airflow that wraps around the surface of the copper wire in the channel.

6. A tin plating chamber with air curtain isolation according to claim 1, characterized in that: In the negative pressure collection mechanism (4), the negative pressure values ​​of the inlet side collection port (41) and the outlet side collection port (43) are less than the negative pressure value of the negative pressure pipe (421) above the pool.

7. A tin plating chamber with air curtain isolation according to claim 1, characterized in that: An arc-shaped guide plate (422) is symmetrically installed between the upper collection port (42) of the pool and the tin pool (2), and the radius of curvature of the arc-shaped guide plate (422) gradually decreases along the airflow direction.

8. A tin plating chamber with air curtain isolation according to claim 1, characterized in that: Air volume regulating valves (5) are installed on each air source transmission pipe of the air curtain isolation mechanism (3) and on each negative pressure pipe of the negative pressure collection mechanism (4).

9. A tin plating chamber with air curtain isolation according to claim 8, characterized in that: It also includes a control unit (10), which includes a controller (101) and a gas sensor group (102) and a pressure sensor group (103) disposed in the tin plating chamber (1). The controller (101) receives the detection signals from the gas sensor group (102) and the pressure sensor group (103) and dynamically adjusts the opening degree of each air volume regulating valve (5) and the power of the negative pressure fan (44) accordingly, so that the tin plating chamber (1) maintains a slightly negative pressure state.

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