Online spray cleaning equipment based on nickel-palladium-gold substrate product

Abstract

The utility model discloses online spray cleaning equipment based on a nickel-palladium-gold substrate product. The online spray cleaning equipment comprises a final rinsing section, an air knife wind cutting section, a first air exhaust section, a high-pressure wind cutting section, a drying section, a second air exhaust section, a cold air wind cutting section and a third air exhaust section which are sequentially communicated from front to back, the final rinsing section comprises a DI water preheating device and a spraying rod which are installed in a cavity of the final rinsing section. The DI water preheating device comprises an electric heater, an electric ball valve and a pressure transmitter; the cold air shear section comprises a condenser, a high-efficiency filter and a third exhaust outlet which are mounted at the top of a cavity of the cold air shear section, and a medium-pressure fan and a cooling plate assembly which are mounted in the cavity of the cold air shear section; the first exhaust section, the second exhaust section and the third exhaust section all comprise partition plates which are laid in cavities of the first exhaust section, the second exhaust section and the third exhaust section and provided with product channels; the first air exhaust section further comprises a first air exhaust opening formed in the top of the cavity of the first air exhaust section. The problem that the gold surface of the PCB product is different in color after chemical nickel-gold surface treatment is solved for the product which is large in production difficulty and thin in gold thickness.

Description

Technical Field

[0001] This utility model relates to an online spray cleaning device, and more particularly to an online spray cleaning device based on a nickel-palladium-gold substrate product, belonging to the technical field of online cleaning equipment. Background Technology

[0002] As electronic products become lighter, thinner, shorter, smaller, higher-frequency, and digital, electroless nickel-gold surface treatment has been rapidly adopted in PCBs (printed circuit boards) due to its excellent protective properties, solderability, flatness, and superior electrical performance. Compared to other PCB surface treatments such as OSP (organic protective film) and tin plating, electroless nickel-gold better meets various SMT (surface mount technology) requirements and is therefore widely used in the electronics industry, including mobile phones, computers, and IC cards.

[0003] However, during the cleaning process of PCB products after electroless nickel-gold surface treatment, especially when using inline cleaning machines, improper control of moisture content and temperature in the air-cutting and drying sections can easily lead to discoloration of the gold pads, such as discoloration at IC (integrated circuit) and BGA (ball grid array) locations. This problem not only affects the appearance of the product, but if problematic products are not detected and cleaned in time, some surface-mount components (such as ICs and BGAs) on the problematic products will be poorly mounted during subsequent processes, thus threatening the electrical performance and reliability of the product, reducing product yield, and increasing production costs.

[0004] To solve this problem, it is particularly important to start from the cleaning process and develop an online spray cleaning device based on nickel-palladium-gold substrate products. Summary of the Invention

[0005] To address the aforementioned existing technical problems, this utility model provides an online spray cleaning device for nickel-palladium-gold substrate products, particularly for thin gold products that are difficult to produce, in order to solve the problem of uneven gold surface color in PCB products after chemical nickel-gold surface treatment.

[0006] To achieve the above technical objectives, this utility model provides an online spray cleaning device based on nickel-palladium-gold substrate products, comprising a final rinsing section, an air knife cutting section, a first exhaust section, a high-pressure air cutting section, a drying section, a second exhaust section, a cold air cutting section, and a third exhaust section connected sequentially from front to back.

[0007] The final rinsing section includes a DI water preheating device and a spray bar installed inside its cavity; the DI water preheating device includes an electric heater, an electric ball valve and a pressure transmitter; the inlet of the electric heater is connected to the inlet pipe through the electric ball valve, and its outlet is connected to the spray bar in sequence through the outlet pipe and the pressure transmitter.

[0008] The cold air cut-off section includes a condenser, a high-efficiency filter, and a third exhaust port installed at the top of its cavity, as well as a medium-pressure fan and a cooling plate assembly installed inside its cavity; the medium-pressure fan is connected to the cooling plate assembly in sequence through the condenser and the high-efficiency filter;

[0009] The first exhaust section, the second exhaust section, and the third exhaust section all include a partition with a product channel laid inside its cavity; the first exhaust section also includes a first exhaust port installed on the top of its cavity.

[0010] Furthermore, the cooling plate assembly includes a bracket and two box-type perforated air outlet plates mounted thereon; each box-type perforated air outlet plate includes a box body and a perforated air outlet on one side thereon; the two box-type perforated air outlet plates are placed one above the other, with their air outlets facing each other, and their air inlets are respectively connected to high-efficiency filters.

[0011] Furthermore, the present invention includes a liquid level sensor installed at the water inlet of the electric heater and a temperature sensor installed at its water outlet.

[0012] Furthermore, the present invention provides that the air knife cutting section includes several elongated air knives installed laterally inside its cavity; the elongated air knife includes an air knife chamber, an air inlet at the top of the air knife chamber, and an air jet outlet at the bottom of the air knife chamber along its length.

[0013] Furthermore, in this invention, the elongated air knife is arranged in two groups, one above the other, with each group of elongated air knives arranged side by side.

[0014] Furthermore, the high-pressure air cutting section includes three high-efficiency filters and a second exhaust port installed on the top of its cavity, as well as a first-stage high-pressure air cutting unit, a second-stage high-pressure air cutting unit, and a third-stage high-pressure air cutting unit installed from front to back inside its cavity; the three high-efficiency filters are connected to the high-pressure air knives inside the first, second, and third-stage high-pressure air cutting units in a one-to-one correspondence.

[0015] Furthermore, the drying section includes a circulating high-pressure blower installed outside its cavity, a high-efficiency filter installed at the top of its cavity, and a drying air knife installed inside its cavity; the air inlet of the circulating high-pressure blower is connected to both the inside and outside of the drying section cavity, and its air outlet is connected to the drying air knife through the high-efficiency filter.

[0016] In summary, this invention provides an online spray cleaning device for nickel-palladium-gold substrate products. It employs a combination of processes including DI water preheating, air knife cutting, high-pressure air cutting, drying, and cold air cutting. This combination effectively removes particulate matter from the PCB surface while achieving complete cleaning and preventing discoloration of the gold surface. This is significant for solving the problem of discoloration on the gold surface of PCB products after electroless nickel-gold surface treatment, and is particularly suitable for PCB products with relatively thin gold layers where discoloration is concentrated at the IC and BGA locations.

[0017] Compared with existing technologies, the technical advantages of this utility model are as follows:

[0018] (1) This utility model adds a first, second, and third exhaust section between the air knife cutting section and the high-pressure air cutting section, between the drying section and the cold air cutting section, and after the cold air cutting section. Each exhaust section is an independent cavity connected to an exhaust port. According to the chimney effect, hot air can only flow out through the product channel on the partition, and then the hot air is quickly drawn away from the exhaust port, thereby accurately controlling the temperature of each process section and avoiding the problems of poor temperature control accuracy and easy temperature cross-contamination in the existing online cleaning machine.

[0019] (2) This utility model connects the DI water preheating device in the final rinsing section to the water inlet pipe of the online cleaning machine to achieve the effect of rapidly heating the room temperature DI water to the set value, and spraying the DI water onto the product through the spray bar equipped with directional nozzles, thereby ensuring that the surface temperature of the product is constant and preventing the product surface from shrinking due to temperature difference.

[0020] (3) This utility model improves the structure of the traditional drying section by using a cold air cutting section to physically cool the product. This not only precisely controls the moisture content and temperature but also quickly lowers the temperature to below 40°C, avoiding the adverse effects of excessively high temperature and humidity on the gold surface. Furthermore, the cooling plate assembly adopts a two-box-type multi-hole air outlet structure, which not only has multi-hole air outlets but also provides uniform airflow, allowing for a longer period of gradual cooling of the product. This ensures that the PCB product surface is dry and odorless after drying, improving product yield and production efficiency. In this way, the large air volume, low pressure, and air cooled by the cooling plate assembly can achieve a temperature 8-15°C lower than that of the traditional drying section structure, resulting in better cooling efficiency for the product. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the exhaust section in this utility model;

[0023] Figure 3 This is a schematic diagram of the DI water preheating device in this utility model;

[0024] Figure 4 This is a schematic diagram of the electric heater in the DI water preheating device of this utility model;

[0025] Figure 5 This is a schematic diagram of the air knife structure of the air knife cutting segment in this utility model;

[0026] Figure 6 This is a cross-sectional schematic diagram of the air knife in the air knife cutting section of this utility model;

[0027] Figure 7 This is a schematic diagram of the structure of the air knife for the high-pressure air cutting section of this utility model;

[0028] Figure 8 This is a schematic diagram of the drying section in this utility model;

[0029] Figure 9 This is a schematic diagram of the structure of the cooling air cutting segment of this utility model;

[0030] Figure 10 This is a schematic diagram of the internal structure of the exhaust section in this utility model;

[0031] Figure 11 This is a partial structural diagram of the exhaust section partition in this utility model;

[0032] In the diagram: 11. Final rinsing section; 12. Air knife cutting section; 13. High-pressure air cutting section; 131. First-stage high-pressure air cutting unit; 132. Second-stage high-pressure air cutting unit; 133. Third-stage high-pressure air cutting unit; 134. Second exhaust vent; 14. Drying section; 15. Cold air cutting section; 151. Third exhaust vent; 161. First exhaust section; 162. First exhaust vent; 163. Second exhaust section; 164. Third exhaust section; 165. Partition; 166. Product channel; 17. High-efficiency filter. Filter, 18. Condenser, 21. Electric heater, 211. Inlet, 212. Outlet, 22. Level sensor, 23. Electric ball valve, 24. Temperature sensor, 25. Pressure transmitter, 26. Spray bar, 27. Inlet pipe, 28. Outlet pipe, 31. High-pressure air knife, 41. Circulating high-pressure fan, 43. Air duct, 44. Drying air knife, 45. Air intake, 47. Manual air valve, 51. Medium-pressure fan, 52. Cooling plate assembly, 521. Box-type perforated air outlet plate. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0034] In the description of this application, terms such as "connection" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Those skilled in the art will understand the specific meaning of these terms in this application according to the specific circumstances.

[0035] In the description of this application, terms such as "up", "down", "left", "right", "front", and "back" are used only to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0036] like Figure 1 , Figure 2 As shown, this utility model includes a final rinsing section 11, an air knife cutting section 12, a first exhaust section 161, a high-pressure air cutting section 13, a drying section 14, a second exhaust section 163, a cold air cutting section 15, and a third exhaust section 164 connected sequentially from front to back, in order to remove particulate matter from the PCB surface while ensuring that the gold surface does not change color, thereby improving product yield and production efficiency. The details are as follows.

[0037] like Figure 3 , Figure 4 As shown, the final rinsing section 11 is equipped with a DI water preheating device and a spray bar 26 inside its cavity. The DI water preheating device includes an electric heater 21, an electric ball valve 23, and a pressure transmitter 25. The inlet 211 of the electric heater 21 is connected to an inlet pipe 27 via the electric ball valve 23, and its outlet 212 is connected to an outlet pipe 28. The outlet pipe 28 is connected to the spray bar 26 via the pressure transmitter 25.

[0038] In practical implementation, the DI water preheating device operates using a direct conduction heating method. Since the heating element is placed in the pipe, cold water flows directly over the surface of the electric heater 21 and is heated as it flows through the pipe. Furthermore, because the water flow direction is serpentine, the cold water flowing into the inlet 211 is gradually heated, resulting in constant-temperature hot water at the outlet 212—instantaneous heating without waiting.

[0039] In other embodiments, such as Figure 3As shown, in order to ensure the safe use of the instant electric water heater and prevent dry burning without water, a liquid level sensor 22 is installed at the water inlet 211 of the electric heater 21, and a temperature sensor 24 is installed at its water outlet 212, which is used to monitor the presence and temperature of water in real time, providing dual protection to achieve a constant supply of hot water.

[0040] like Figure 1 , Figure 2 As shown, a first exhaust section 161 is provided between the air knife cutting section 12 and the high-pressure air cutting section 13. Figure 10 , Figure 11 As shown, the first exhaust section 161 includes a partition 165 with a product channel 166 laid inside its cavity, and a first exhaust port 162 installed on the top of its cavity.

[0041] In specific implementation, such as Figure 2 As shown, the first exhaust section 161 is an independent cavity with a first exhaust port 162 connected to its top. The air knife cutting section 12 and the high-pressure air cutting section 13 are respectively connected to the first exhaust port 162. Utilizing the chimney effect, hot air rises naturally within the cavity of the first exhaust section 161 and can only exit through the product channel 166 on the partition 165, thereby quickly removing the hot air and achieving precise control of the internal temperature of the air knife cutting section 12 and the high-pressure air cutting section 13.

[0042] like Figure 5 , Figure 6 As shown, the air knife cutting section 12 includes several elongated air knives installed laterally inside its cavity; the elongated air knife includes an air knife chamber 31, an air inlet 32 ​​opened at the top of the air knife chamber 31, and an air jet 33 opened at the bottom of the air knife chamber 31 along its length.

[0043] In practice, compressed air is used as the energy source. When the compressed air enters the air inlet 32 ​​of the air knife, it passes through the narrow and thin nozzle 33, forming a uniform, thin, high-intensity, and large-flow impact air curtain along the length of the elongated air knife. During this process, because the compression ratio of the high-pressure airflow in the air knife chamber 31 can reach 40:1, the velocity loss of the airflow is minimized, and the pressure reaches its maximum, causing the nozzle 33 to generate a thin sheet of airflow with strong impact force but minimal shear force. When there is surface friction between the impact air curtain and the surface of the PCB board or other products it flows over, the flow velocity of the impact air curtain slows down, and at the same time, the DI water adhering to the product surface is quickly removed.

[0044] like Figure 2 As shown, in other embodiments, the elongated air knife is arranged in two groups, one above the other, with each group of elongated air knives installed side by side and perpendicular to the mesh belt surface of the conveyor below.

[0045] like Figure 1 , Figure 2 , Figure 7 As shown, the high-pressure air cutting section 13 includes three high-efficiency filters 17 and a second exhaust port 134 installed at the top of its cavity, and a first-stage high-pressure air cutting unit 131, a second-stage high-pressure air cutting unit 132, and a third-stage high-pressure air cutting unit 133 installed from front to back inside its cavity. Each of the first, second, and third-stage high-pressure air cutting units 131, 132, and 133 contains several high-pressure air knives 31. The three high-efficiency filters 17 are connected to the high-pressure air knives 31 inside the first, second, and third-stage high-pressure air cutting units 131, 132, and 133 in a one-to-one correspondence.

[0046] In practice, the high-pressure air-cutting section 13 firstly includes a primary high-pressure air-cutting unit 131, a secondary high-pressure air-cutting unit 132, and a tertiary high-pressure air-cutting unit 133, arranged in a three-stage parallel configuration with constant temperature. Products entering the high-pressure air-cutting section 13 contain residual DI water from rinsing. As the products sequentially pass through the primary, secondary, and tertiary high-pressure air-cutting units 131, 132, and 133, the visible water on the product surface is rapidly removed through progressively high-pressure air-cutting.

[0047] Secondly, three high-efficiency filters 17 are installed on top of the high-pressure air cutting section 13 for easy daily maintenance. The air generated by the high-pressure blower is filtered by the high-efficiency filters 17 and then enters the corresponding high-pressure air knife 31. The high-pressure air knife 31 achieves the effect of air cutting and water blowing, which can blow off large water droplets remaining on the PCB board surface. As the water droplets move on the product surface, their volume continuously decreases, while their contact area with the air continuously increases, making it easier for water vapor to evaporate. After the air cutting and water blowing, only a thin layer of residual water vapor remains on the product surface. After entering the drying section 14, it can not only effectively shorten the drying time and improve the drying efficiency, but also reduce the drying energy consumption.

[0048] Furthermore, such as Figure 2 As shown, a first exhaust section 161 and its first exhaust port 162 are added between the final rinsing section 11 and the high-pressure air cutting section 13. Utilizing the chimney effect, hot air rises naturally within the cavity of the first exhaust section 161 and can only flow out through the product channel 166 on the partition 165, before being quickly drawn away from the first exhaust port 162. Furthermore, the high-pressure air cutting section 13 and the drying section 14 are respectively connected to the second exhaust port 134. Hot air rises naturally within the cavities of the high-pressure air cutting section 13 and the drying section, and is then quickly drawn away from the second exhaust port 134, thereby effectively controlling the temperature of the high-pressure air cutting section 13 and the drying section 14.

[0049] like Figure 1 , Figure 2 , Figure 8As shown, the drying section 14 includes a circulating high-pressure blower 41 installed outside its cavity, a high-efficiency filter 17 installed at the top of its cavity, and a drying air knife 44 installed inside its cavity; the air inlet 45 of the circulating high-pressure blower 41 is connected to the inside and outside of the drying section 14 cavity respectively, and its air outlet is connected to the drying air knife 44 through the high-efficiency filter 17.

[0050] In specific implementation, the air intake 45 of the circulating high-pressure blower 41 is connected to two air sources. One air source draws hot air from the outlet of the drying section 14 cavity, and the other air source draws air from the outside (such as the workshop) through a filter element at the bottom of the drying section 14 cavity. The air intake ratio of the two air sources is adjusted by a manual air valve 47. After being pressurized by the circulating high-pressure blower 41, the air is heated by a heater, then sent out through a high-efficiency filter 17, and connected to the drying air knife 44 through the air duct 43, achieving the effect of hot air drying, with uniform and efficient hot air. In particular, the circulating high-pressure blower 41 adopts a circulating air supply method, allowing the air source to be reheated and reused, and ensuring the uniformity of the temperature inside the drying section 14 cavity.

[0051] like Figure 1 , Figure 2 As shown, a second exhaust section 163 is added between the drying section 14 and the cold air cutting section 15. Figure 10 , Figure 11 As shown, the second exhaust section 163 includes a partition 165 with a product channel 166 laid inside its cavity.

[0052] In specific implementation, such as Figure 2 As shown, the drying section 14 and the cold air cutting section 15 are separated by the second exhaust section 163. Furthermore, a third exhaust vent 151 is installed at the top of the cold air cutting section 15, and the second exhaust section 163 connects to the third exhaust vent 151. Utilizing the chimney effect, hot air rises naturally within the second exhaust section 163 and can only exit through the product channel 166 on the partition 165. The hot air is then quickly drawn away from the third exhaust vent 151, effectively controlling the temperature of the cold air cutting section 15 and preventing temperature fluctuations.

[0053] like Figure 1 , Figure 2 , Figure 9 As shown, the cold air cut-off section 15 includes a condenser 18, a high-efficiency filter 17, and a third exhaust vent 151 installed at the top of its cavity, as well as a medium-pressure fan 51 and a cooling plate 52 installed inside its cavity. The medium-pressure fan 51 is connected to the condenser 18. The condenser 18 is connected to the high-efficiency filter 17. The high-efficiency filter 17 is connected to the cooling plate assembly 52.

[0054] In other embodiments, the cooling plate assembly 52 includes a bracket and two box-type perforated air outlet plates 521 mounted thereon; each box-type perforated air outlet plate 521 includes a box body and a perforated air outlet on one side thereon; the two box-type perforated air outlet plates 521 are placed one above the other with their air outlets facing each other and their air inlets are respectively connected to a high-efficiency filter 17.

[0055] In practical implementation, traditional cooling plate structures use air blade cooling, resulting in a small cooling surface. Only a small area at the air outlet can act on the product surface. Although the pressure is high, the effect time is short, leading to low overall cooling efficiency. The cooling plate assembly 52 used in this invention includes two box-type perforated air outlet plates 521. These plates have perforated air outlets, ensuring low-pressure and uniform airflow, allowing for longer-term gradual cooling of the product and preventing damage from sudden cooling. Furthermore, the airflow, with its large volume and low pressure, cooled by the cooling plate assembly 52, is 8-15°C cooler than air cooled by a traditional cooling plate assembly 52 structure, thus achieving better cooling efficiency for the product.

[0056] like Figure 1 , Figure 2 As shown, a third exhaust section 164 is provided behind the cold air cutting section 15. Figure 10 , Figure 11 As shown, the third exhaust section 164 is an independent cavity, including a partition 165 with a product channel 166 laid inside the cavity.

[0057] In specific implementation, such as Figure 2 As shown, the cold air cutting section 15 also includes a third exhaust port 151 installed at the top of its cavity, and the second exhaust section 163 and the third exhaust section 164 are respectively connected to the third exhaust port 151. Utilizing the principle of the chimney effect, hot air rises naturally within the cavities of the second exhaust section 163 and the third exhaust section 164, and can only flow out through the product channel 166 on the partition 165, and then the hot air is quickly drawn away from the third exhaust port 151, thereby allowing for precise control of the temperature of the cold air cutting section 15.

[0058] In summary, the working process of this utility model is as follows: First, the product is sent to the final rinsing section 11. The DI water preheating device is installed in the final rinsing section 11 and connected to the water inlet pipe 27 to achieve the effect of rapidly heating the room temperature DI water to the set value. The DI water medium is then sprayed onto the product through the spray bar 26 equipped with a directional nozzle to ensure that the surface temperature of the product is constant and to prevent the product surface from shrinking due to temperature difference.

[0059] Next, the product is sent to the air knife cutting section 12. Under the action of several long strip air knives, the water droplets on the surface of the product are quickly removed. Since the long strip air knife uses compressed air as energy, the pressure is high, thus quickly removing the water attached to the surface of the product before the water temperature drops.

[0060] Next, the product is sent to the high-pressure air cutting section 13. This process section is arranged in a three-stage parallel and constant-temperature manner to quickly remove the residual moisture on the product surface.

[0061] Furthermore, the product is sent to the drying section 14, where it is quickly dried at a low temperature of 75-80℃, ensuring that the product is heated evenly while slowly evaporating the moisture inside the product.

[0062] Finally, the product is sent to the cold air cutting section 15. This equipment is using this process section for the first time. The product is physically cooled by cold air, and the temperature is quickly reduced to below 40°C.

[0063] The combined effect of the above processes can achieve the effect of completely cleaning the product and preventing discoloration of the gold surface.

[0064] The technical solutions provided by the embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, based on the ideas of this utility model, modifications can be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the ideas and scope of the technical solutions of the embodiments of this utility model.

Claims

1. An on-line spray cleaning apparatus for a nickel-palladium-gold substrate product, characterized by, The air knife wind cutting section, the first exhaust section, the high-pressure wind cutting section, the drying section, the second exhaust section, the cold wind wind cutting section, and the third exhaust section are sequentially connected from front to back. The final rinsing section comprises a DI water preheating device and a spray bar installed inside the cavity thereof; the DI water preheating device comprises an electric heater, an electric ball valve, and a pressure transmitter; the water inlet of the electric heater is connected to the water inlet pipeline through the electric ball valve, and the water outlet thereof is sequentially connected to the spray bar through a water outlet pipeline and the pressure transmitter. The cold wind wind cutting section comprises a condenser, a high-efficiency filter, and a third exhaust port installed at the top of the cavity thereof, and a medium-pressure fan and a cooling plate assembly installed inside the cavity thereof; the medium-pressure fan is sequentially connected to the cooling plate assembly through the condenser and the high-efficiency filter. The first exhaust section, the second exhaust section, and the third exhaust section each comprise a partition plate with a product channel laid inside the cavity thereof; the first exhaust section further comprises a first exhaust port installed at the top of the cavity thereof.

2. The on-line spray cleaning apparatus for a nickel-palladium-gold substrate product according to claim 1, characterized by, The cooling plate assembly comprises a bracket and two box-shaped porous air outlet plates installed thereon; each box-shaped porous air outlet plate comprises a box body and a porous air outlet opening formed in one face thereof; the two box-shaped porous air outlet plates are placed one above the other, the air outlets thereof are opposite to each other, and the air inlets thereof are respectively connected to the high-efficiency filters.

3. The online spray cleaning apparatus based on a nickel-palladium-gold substrate product according to claim 1, characterized in that, A liquid level sensor is installed at the water inlet of the electric heater, and a temperature sensor is installed at the water outlet thereof.

4. An in-line spray cleaning apparatus for a nickel-palladium-gold substrate product according to any one of claims 1 to 3, characterized in that The air knife wind cutting section comprises a plurality of long-strip air knives installed transversely inside the cavity thereof; the long-strip air knife comprises an air knife cavity, an air inlet opening formed at the top of the air knife cavity, and a gas jet opening formed at the bottom of the air knife cavity in the length direction.

5. The on-line spray cleaning apparatus for a nickel-palladium-gold substrate product according to claim 4, characterized by, The long-strip air knives are arranged in two groups, one above the other, and each group is arranged side by side in front of and behind the other.

6. An in-line spray cleaning apparatus for a nickel-palladium-gold substrate product according to any one of claims 1-3, wherein The high-pressure wind cutting section comprises three high-efficiency filters and a second exhaust port installed at the top of the cavity thereof, and a first-stage high-pressure wind cutting unit, a second-stage high-pressure wind cutting unit, and a third-stage high-pressure wind cutting unit installed inside the cavity thereof from front to back; the three high-efficiency filters are in one-to-one correspondence with the high-pressure air knives inside the first-stage, second-stage, and third-stage high-pressure wind cutting units.

7. An in-line spray cleaning apparatus for a nickel-palladium-gold substrate product according to any one of claims 1-3, wherein The drying section comprises a circulating high-pressure fan installed outside the cavity thereof, a high-efficiency filter installed at the top of the cavity thereof, and a drying air knife installed inside the cavity thereof; the air suction inlets of the circulating high-pressure fan are respectively connected to the inside and outside of the drying section cavity, and the air outlet thereof is connected to the drying air knife through the high-efficiency filter.

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