A production and processing technology of tinned copper wire and a scraping knife device

Abstract

The present invention relates to the technical field of copper wire production processes, and provides a production and processing process for tinned copper wire and a scraper device, including the following steps: S1: feeding a copper rod into a continuous extruder for extrusion to form a preliminarily formed copper wire; S2: feeding the preliminarily formed copper wire in step S1 into a wire drawing machine for multi-stage stretching to gradually reduce its diameter until the required specification is reached, obtaining the stretched copper wire; The present invention overcomes the deficiencies of the prior art, has a reasonable design and a compact structure. The true roundness of the tinned copper wire manufactured by this application is less than 0.001 mm, with higher shape accuracy and a more uniform cross-section, making the resistance distribution more uniform, which can reduce current loss and heat generation caused by uneven resistance. By reasonably configuring the tin plating solution, the oxidation of divalent tin to tetravalent tin ions can be effectively reduced, improving the stability of the tin plating solution. By setting a scraper assembly, the excess tin solution on the surface of the copper wire is scraped off, further improving the true roundness and uniformity of the tinned copper wire.

Description

Technical Field

[0001] The present invention relates to the technical field of copper wire production processes, and particularly to a production and processing process for tinned copper wire and a scraper device. Background Art

[0002] The copper wire production process mainly includes steps such as continuous wire drawing for refinement, annealing to eliminate stress, tin plating to enhance performance, drying, and winding into products. These links are interconnected to provide high-quality copper wire products for various fields.

[0003] Drying is an important process step after copper wire tin plating. It helps improve the stability of the tin layer and remove volatile substances. However, there is no treatment for the excess tin liquid on the surface of the tinned copper wire between drying and tin plating. This greatly reduces the true roundness of the tinned copper wire, seriously affecting the quality of the tinned copper wire. Moreover, stannous tin in the tin plating solution is easily oxidized to stannic tin ions, and the suspended matter generated by stannic tin continuously increases, increasing the impurities on the surface of the tinned copper wire, thereby affecting the coating quality. For this reason, we propose a production and processing process for tinned copper wire and a scraper device. Summary of the Invention

[0004] (I) Technical Problems to be Solved

[0005] In view of the deficiencies of the prior art, the present invention provides a production and processing process for tinned copper wire and a scraper device, which overcomes the deficiencies of the prior art, is reasonably designed, has a compact structure, and solves the problems of poor true roundness of the existing copper wire tin plating and poor quality of the tin plating layer due to impurities.

[0006] (II) Technical Solutions

[0007] To achieve the above objectives, the present invention is realized through the following technical solutions: A production and processing process for tinned copper wire includes the following steps:

[0008] S1: Feed the copper rod into a continuous extruder for extrusion to form a preliminarily formed copper wire;

[0009] S2: Feed the preliminarily formed copper wire in step S1 into a wire drawing machine for multi-stage stretching to gradually reduce its diameter until the required specification is reached, obtaining the stretched copper wire;

[0010] S3: Pass the stretched copper wire in step S2 through an annealing device and a tin plating device for annealing and tin plating treatment. After the copper wire is tinned, it passes through a scraper device, and the scraper device rotates annularly to remove the excess tin liquid on the surface of the tinned copper wire, and then drying is carried out;

[0011] S4: Pass the tinned copper wire in step S3 through a winding machine for winding treatment to form the required coil.

[0012] Preferably, the annealing and tin plating processes in step S3 are as follows:

[0013] S31. Feed the drawn copper wire into a cleaning device with degreaser to conduct deep degreasing and impurity removal, ensuring that the surface of the copper wire is clean without oil stains, and then rinse it with running water to ensure that the surface of the copper wire is clean;

[0014] S32. Feed the copper wire processed in step S31 into an annealing furnace for annealing treatment, heat it to 320 - 430 °C, and maintain for 30 - 40 minutes to release the internal stress of the copper wire and improve its plasticity. After annealing, slowly cool the copper wire to room temperature;

[0015] S33. Rinse the annealed and cooled copper wire in step S32 with running water, then feed the copper wire into a pickling bath with pickling solution for activation treatment. The pickling time is 40 - 70 min, and finally rinse it with running water again to remove the residual activator and reaction products on the surface of the copper wire;

[0016] S34. Feed the activated copper wire in step S33 into a tin plating solution for tin plating treatment. The tin plating temperature is 20 - 35 °C, the current density is 0.3 - 0.5 A / dm², and the tin plating time is 4 - 8 min, so that a layer of tin is evenly covered on the surface of the copper wire;

[0017] S35. Remove the excess plating solution from the copper wire after tin plating treatment in step S34 with a scraper, and then feed it into a drying furnace for drying and curing. The drying temperature is 120 - 140 °C, and the drying time is 5 - 12 min, so that the tin layer firmly adheres to the surface of the copper wire;

[0018] S36. Conduct cold air treatment on the copper wire after drying and curing in step S35 to cool it to room temperature.

[0019] The degreaser described in step S31 is by mass:

[0020] Composed of 12 - 16 parts of fatty alcohol polyoxyethylene ether, 22 - 30 parts of polyethylene glycol, 50 - 70 parts of oleic acid, 5 - 10 parts of sodium nitrite, and deionized water. The mass concentration of the sum of fatty alcohol polyoxyethylene ether, polyethylene glycol, oleic acid, and sodium nitrite in the degreaser is between 10% and 30%.

[0021] The pickling solution described in step S33 is by mass:

[0022] Composed of 18 - 22 parts of nitric acid, 3 - 5 parts of hydrofluoric acid, and deionized water. The pH of the pickling solution is between 3 and 4.

[0023] The tin plating solution described in step S34 is as follows by mass:

[0024] 20 - 30 parts of stannous sulfate, 42 - 75 parts of sulfuric acid, 9 - 15 parts of tartaric acid, 0.06 - 0.1 part of inorganic salt, 1 - 2 parts of sulfite, 0.2 - 0.4 part of citric acid, 0.1 - 0.4 part of naphthol sulfonic acid, add deionized water to make up 1000 parts.

[0025] Further, the inorganic salt is a sodium salt or a potassium salt.

[0026] Further, the sulfite is sodium sulfite or sodium bisulfite.

[0027] A scraping device includes a wire tube through which tinned copper wire passes. On both sides of the wire tube, there are symmetrically arranged tooth bars. At the bottom of both tooth bars, there are scraping blade assemblies for scraping off the excess tin liquid on the surface of the tinned copper wire. The cutting edges of the scraping blade assemblies on both sides are arranged opposite to each other, and the distances from the cutting edges of the scraping blade assemblies on both sides to the axis of the wire tube are equal.

[0028] Further, on both sides of the wire tube, there are limit blocks for the rod parts of the tooth bars to slide. On the outer wall of the wire tube, there is a driving gear. The tooth parts of the tooth bars on both sides are arranged opposite to each other, and between them, there is an adjusting gear meshed with the tooth parts of the tooth bars on both sides. On the adjusting gear, there is an adjusting disk for driving its rotation.

[0029] Further, the scraping blade assembly includes a sleeve, a scraping blade arm, and a scraping blade head connected in sequence. At the bottom of the tooth bar, there are a connecting rod and a screw for fixing the scraping blade assembly in cooperation with the sleeve. The narrow diameter end of the connecting rod is inserted into the sleeve, and the rod part of the screw is thread - connected inside the narrow diameter end of the connecting rod, and the nut part abuts against the bottom of the sleeve.

[0030] (III) Beneficial effects

[0031] The embodiments of the present invention provide a production and processing process for tinned copper wire and a scraping device, having the following beneficial effects:

[0032] 1. The true roundness of the tinned copper wire manufactured in this application is less than 0.001 mm, having higher shape accuracy and a more uniform cross - section, making the resistance distribution more uniform, and reducing current loss and heat generation caused by non - uniform resistance.

[0033] 2. By reasonably configuring the tinning solution, it can effectively reduce the oxidation of divalent tin to tetravalent tin ions, improve the stability of the tinning solution, make the tin layer wrapping of the tinned copper wire manufactured in this application uniform and tight, ensure the continuity of current transmission, reduce resistance, thereby improving the conductive efficiency, and the highly wrapped tin layer can better isolate the copper wire from the external environment, effectively preventing the copper wire from being oxidized, corroded and other damages, and not easily having cracks or being peeled off.

[0034] 3. By setting up the scraper assembly, the scraper assembly rotates around the tinned copper wire to scrape off the excess tin liquid on the surface of the copper wire, further improving the roundness of the tinned copper wire and the uniformity of tin plating on the surface of the copper wire.

[0035] 4. Rotate the adjustment disc. At this time, the distance between the cutting edges of the two scraper assemblies will change, and the scraper assembly rotates around the tinned copper wire, facilitating the surface tin scraping treatment of copper wires of different thicknesses. Brief Description of the Drawings

[0036] Figure 1 It is the front view three-dimensional schematic diagram of the overall structure in Embodiment 4 of the present invention;

[0037] Figure 2 It is the bottom view three-dimensional schematic diagram of the overall structure in Embodiment 4 of the present invention;

[0038] Figure 3 It is the three-dimensional schematic diagram of the connecting rod structure in Embodiment 4 of the present invention;

[0039] Figure 4 It is the three-dimensional schematic diagram of the scraper assembly structure in Embodiment 4 of the present invention.

[0040] In the figure: 1. Wire tube; 11. Limit block; 12. Driving gear; 2. Rack; 21. Connecting rod; 3. Scraper assembly; 31. Sleeve; 32. Scraper arm; 33. Scraper head; 4. Screw; 5. Adjusting gear; 6. Adjustment disc. Detailed Embodiment

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0042] Embodiment 1

[0043] A production and processing process for tinned copper wire includes the following steps:

[0044] S1: Feed the copper rod into a continuous extruder for extrusion to form a preliminarily formed copper wire;

[0045] S2: Feed the preliminarily formed copper wire in step S1 into a wire drawing machine for multi-stage stretching to gradually reduce its diameter until the required specification is reached, obtaining the stretched copper wire;

[0046] S3: Feed the drawn copper wire in step S2 into an annealing device and a tin plating device for annealing and tin plating treatments. After the copper wire is tin plated, it passes through a scraping device. The scraping device rotates annularly to remove the excess tin liquid on the surface of the tin plated copper wire, and then it is dried;

[0047] The annealing and tin plating treatments are as follows:

[0048] S31: Feed the drawn copper wire into a cleaning device with degreaser for deep degreasing and impurity removal to ensure that the surface of the copper wire is clean without oil stains. The degreaser is composed of, by mass:

[0049] 12 parts of fatty alcohol polyoxyethylene ether, 22 parts of polyethylene glycol, 50 parts of oleic acid, 5 parts of sodium nitrite, and deionized water. The mass concentration of the sum of fatty alcohol polyoxyethylene ether, polyethylene glycol, oleic acid, and sodium nitrite in the degreaser is 10%;

[0050] Then rinse it with running water to ensure that the surface of the copper wire is clean;

[0051] S32: Feed the copper wire treated in step S31 into an annealing furnace for annealing treatment. Heat it to 320 °C and keep it for 30 minutes to release the internal stress of the copper wire and improve its plasticity. After annealing is completed, slowly cool the copper wire to room temperature;

[0052] S33: Rinse the annealed and cooled copper wire in step S32 with running water, and then feed the copper wire into a pickling bath with pickling solution for activation treatment. The pickling time is 40 min. The pickling solution is composed of, by mass:

[0053] 18 parts of nitric acid, 3 parts of hydrofluoric acid, and deionized water. The pH of the pickling solution is between 3;

[0054] Finally, rinse it again with running water to remove the residual activator and reaction products on the surface of the copper wire;

[0055] S34: Feed the activated copper wire in step S33 into a tin plating solution for tin plating treatment. The tin plating temperature is 20 °C, the current density is 0.3 A / dm², and the tin plating time is 4 min to evenly cover a layer of tin on the surface of the copper wire. The tin plating solution is as follows, by mass:

[0056] 20 parts of stannous sulfate, 42 parts of sulfuric acid, 9 parts of tartaric acid, 0.06 part of inorganic salt, 1 part of sulfite, 0.2 part of citric acid, 0.1 part of naphthalenesulfonic acid, and add deionized water to 1000 parts.

[0057] S35: Remove the excess plating solution from the tin plated copper wire in step S34 with a scraper, and then feed it into a drying furnace for drying and curing. The drying temperature is 120 °C and the drying time is 5 min to firmly attach the tin layer to the surface of the copper wire;

[0058] S36. Perform cold air treatment on the copper wire after drying and curing in step S35 to cool it to room temperature, increase the cooling rate, and improve the subsequent winding efficiency.

[0059] S4: Wind the tinned copper wire in step S3 through a winding machine to form the required coil.

[0060] In this embodiment, the inorganic salt is a sodium salt or a potassium salt. Sodium and potassium can act as strong reducing agents and participate in the reduction reaction to promote the deposition of metal ions. Adding an appropriate amount of sodium salt or potassium salt to the electroplating solution can also increase the reduction rate of the electrode reaction, thereby improving the electroplating speed and efficiency. Moreover, sodium salts and potassium salts can affect the crystal structure of the metal and promote the growth and oriented arrangement of metal crystals, thus improving the quality of tin plating.

[0061] In this embodiment, the sulfite is sodium sulfite or sodium bisulfite. Both sodium sulfite and sodium bisulfite have strong reducibility, can effectively prevent the tin ions in the tin plating solution from being oxidized, thereby maintaining the stability and activity of the plating solution. And these two salts have low costs and can also help adjust the pH value of the plating solution to keep its pH value within the range suitable for tin plating.

[0062] Example 2

[0063] Repeat Example 1, with the following differences:

[0064] The degreaser is calculated by mass parts:

[0065] Composed of 14 parts of fatty alcohol polyoxyethylene ether, 26 parts of polyethylene glycol, 60 parts of oleic acid, 8 parts of sodium nitrite, and deionized water. The mass concentration of the sum of fatty alcohol polyoxyethylene ether, polyethylene glycol, oleic acid, and sodium nitrite in the degreaser is within 20%;

[0066] The pickling solution is calculated by mass parts:

[0067] Composed of 20 parts of nitric acid, 4 parts of hydrofluoric acid, and deionized water. The pH of the pickling solution is between 3.5;

[0068] Finally, rinse with running water to remove the remaining activator and reaction products on the surface of the copper wire;

[0069] The tin plating solution is as follows by mass parts:

[0070] 25 parts of stannous sulfate, 60 parts of sulfuric acid, 12 parts of tartaric acid, 0.08 part of inorganic salt, 1.5 parts of sulfite, 0.3 part of citric acid, 0.2 part of naphthalenesulfonic acid, and add deionized water to 1000 parts.

[0071] Example 3

[0072] Repeat Example 1, with the following differences:

[0073] The degreasing agent is composed of, by mass parts:

[0074] 16 parts of fatty alcohol polyoxyethylene ether, 30 parts of polyethylene glycol, 70 parts of oleic acid, 10 parts of sodium nitrite, and deionized water. The mass concentration of the sum of fatty alcohol polyoxyethylene ether, polyethylene glycol, oleic acid, and sodium nitrite in the degreasing agent is within 30%;

[0075] The pickling solution is composed of, by mass parts:

[0076] 22 parts of nitric acid, 5 parts of hydrofluoric acid, and deionized water. The pH of the pickling solution is between 4;

[0077] Finally, rinse with flowing water to remove the residual activator and reaction products on the surface of the copper wire;

[0078] The tin plating solution is as follows, by mass parts:

[0079] 30 parts of stannous sulfate, 75 parts of sulfuric acid, 15 parts of tartaric acid, 0.1 part of inorganic salt, 2 parts of sulfite, 0.4 part of citric acid, 0.4 part of naphthol sulfonic acid, and add deionized water to 1000 parts;

[0080] Comparative Example 1

[0081] A production and processing process of tinned copper wire. This processing process is basically the same as that of Example 1, and the only difference is the different components of the degreasing agent:

[0082] The mass fractions of the components of the degreasing agent are as follows:

[0083] It is composed of 1 part of ammonium phosphite, 1 part of boric acid, 1 part of phosphoric acid, and 60 parts of deionized water.

[0084] The production process is as follows:

[0085] Add ammonium phosphite, boric acid, and phosphoric acid to 60 parts of deionized water in a ratio of 1:1:1.

[0086] Comparative Example 2

[0087] A production and processing process of tinned copper wire. This processing process is basically the same as that of Example 1, and the only difference is the different components of the pickling solution:

[0088] The mass fractions of the components of the pickling solution are as follows:

[0089] It is composed of 22 parts of sulfuric acid, 5 parts of sodium nitrate, 2 parts of brightener, and deionized water;

[0090] The production process is as follows:

[0091] Mix nitric acid, sodium nitrate, and brightener and then add deionized water to make the pH of the pickling solution 3.

[0092] Comparative Example 3

[0093] A production and processing process of tinned copper wire, which is basically the same as that in Example 1, and the only difference is the different components of the tin plating solution:

[0094] The mass fractions of each component of the tin plating solution are as follows:

[0095] 210 parts of ethanesulfonic acid, 61 parts of stannous methanesulfonate, 6 parts of silver hydroxypropylsulfonate, 152 parts of methylguanidine, 52 parts of sodium phosphite, 82 parts of aminophenol, 16 parts of cetyltrimethylammonium chloride, 11 parts of imidazole, deionized water.

[0096] The production process is as follows:

[0097] Calculated by a total of 1000 parts, mix ethanesulfonic acid, stannous methanesulfonate, silver hydroxypropylsulfonate, methylguanidine, sodium phosphite, aminophenol, cetyltrimethylammonium chloride, and imidazole, and then add deionized water to 1000 parts.

[0098] Appearance, wire diameter, antioxidant property, conductivity, and bending tests were respectively carried out on Examples 1-3 and Comparative Examples 1-3 of the present invention, and the test results are shown in the following table

[0099] Roundness (average value) mm Coatability of tin layer <![CDATA[Conductivity test (resistivity 10⁻ 8 Ω / m)]]> Adhesion test (bending test) High temperature oxidation test Example 1 0.00098 99.6% 1.88 No fracture or peeling of the coating No black spots Example 2 0.00098 99.8% 1.89 No fracture or peeling of the coating No black spots Example 3 0.00099 99.7% 1.87 No fracture or peeling of the coating No black spots Comparative Example 1 0.0019 98.4% 1.93 Cracks appear in the coating A small number of black dots Comparative Example 2 0.0016 98.8% 1.94 Cracks appear in the coating A small number of black dots Comparative Example 3 0.0023 98.2% 1.95 Peeling of the coating appears A small number of black spots ;

[0100] It can be obtained from the above table that compared with Comparative Examples 1-3, in Examples 1-3 of the present invention, it can be found that the roundness of the copper wire manufactured in Examples 1-3 (the difference between the maximum diameter and the minimum diameter of the copper wire) is smaller than that of the copper wire manufactured in Comparative Examples 1-3. The roundness of the copper wire manufactured in Examples 1-3 being less than 0.001 mm means that the cross-sectional shape of the copper wire is very close to a perfect circle, which means that the copper wire in the examples has higher shape accuracy and a more uniform cross-section, has a more uniform resistance distribution, and can reduce current loss and heat generation caused by non-uniform resistance.

[0101] The tin layer wrapping property of the copper wire manufactured in Examples 1-3 is greater than that of the copper wire manufactured in Comparative Examples 1-3. A high tin layer wrapping property means that the tin plating layer evenly and tightly covers the surface of the copper wire. The uniform tin layer can ensure the continuity of current transmission, reduce resistance, thereby improving the conductive efficiency, and the tin layer with high wrapping property can better isolate the copper wire from contact with the external environment, effectively preventing the copper wire from being damaged by oxidation, corrosion, etc.

[0102] Cracks or peeling occurred in Comparative Examples 1-3 relative to Examples 1-3, which means that the tin plating layer is uneven, the thickness of the tin plating layer is insufficient, and the surface of the copper wire contains impurities, oxides, etc.

[0103] During the high-temperature oxidation test, black dots or black patches appeared in Comparative Examples 1-3 compared with Examples 1-3. The tin plating on the surface of the copper wires in the comparative examples was uneven. In a high-temperature environment, the copper wires came into contact with oxygen in the air, resulting in the gradual oxidation of the copper surface and the formation of a black copper oxide film.

[0104] Through the above comparison, it can be found that the performance of the copper wires manufactured in Examples 1-3 is superior to that of Comparative Examples 1-3 in all aspects. Fatty alcohol polyoxyethylene ether is a surfactant that can rapidly reduce the interfacial tension between oil and water, effectively disperse and emulsify oil stains, separate them from the metal surface, enhance the penetration ability of the cleaning agent, and thoroughly remove oil stains, thus achieving the cleaning effect. Polyethylene glycol has strong dissolving ability and viscosity adjustment ability, can effectively dissolve oil stains, disperse them into water, prevent the oil stains from adhering to the copper wire surface again, improve the cleaning effect, and make the copper wire cleaner in degreasing and impurity removal after wire drawing.

[0105] Nitric acid can remove oxides, rust, and oil stains on the surface of the workpiece. At the same time, it can also react with impurities on the metal surface to form soluble salts, which is convenient for subsequent cleaning and treatment. Hydrofluoric acid mainly plays a role in dissolving insoluble oxides in the pickling solution. On the one hand, it cleans the copper wire, and on the other hand, it removes the oxide layer of the copper wire, exposing the fresh copper surface and improving the reaction activity of the copper wire.

[0106] Tartaric acid plays a buffering role in the tin plating solution, can stabilize the pH value of the plating solution, and prevent the tin plating quality from being affected by pH value fluctuations. Citric acid has good chelating ability in the tin plating solution, can combine with impurity ions in the plating solution to prevent them from interfering with the tin plating process, which helps to improve the purity and quality of the tin plating layer. Naphthol sulfonic acid can effectively reduce the oxidation of divalent tin to tetravalent tin ions, thereby preventing the hydrolysis phenomenon of tin ions, improving the stability of the tin plating solution, making the surface of the plating layer smoother and more uniform, and improving the aesthetics of the product.

[0107] In addition, the mass concentration of the substances in the degreasing agent is controlled between 10% and 30%. Such a concentration range enables the degreasing agent to have sufficient cleaning ability and will not cause the colloid to be too dense due to too high a concentration, affecting the removal effect. The appropriate concentration also helps to reduce the cost of the degreasing agent and improve the use efficiency.

[0108] The pH value of the pickling solution is controlled between 3 and 4. This range helps to maintain the stability and activity of the pickling solution. Within this pH value range, the components in the pickling solution can maintain the best chemical reaction activity, thereby achieving effective cleaning of the metal surface and removal of oxides.

[0109] Example 4

[0110] This example describes a scraper device applicable to the processing technology of Examples 1-3. Refer to the appendixFigures 1 - 4 , a scraping device, including a wire tube 1 through which tinned copper wire passes. On both sides of the wire tube 1, there are symmetrically arranged toothed rods 2. At the bottom of both toothed rods 2, there are scraping blade assemblies 3 for scraping off the excess tin liquid on the surface of the tinned copper wire. The cutting edges of the scraping blade assemblies 3 on both sides are arranged opposite to each other, and the distances from the cutting edges of the scraping blade assemblies 3 on both sides to the axis of the wire tube 1 are equal. After the copper wire is tinned, it passes through the center of the wire tube 1. During this process, the wire tube 1 rotates, and the wire tube 1 drives the scraping blade assemblies 3 to rotate around the tinned copper wire in a circular motion through the toothed rods 2. At this time, the cutting edges of the scraping blade assemblies 3 scrape off the excess tin liquid on the surface of the copper wire, greatly improving the roundness of the tinned copper wire and the uniformity of tin plating on the surface of the copper wire.

[0111] On both sides of the wire tube 1, there are limit blocks 11 for the rod parts of the toothed rods 2 to slide. On the outer wall of the wire tube 1, there is a driving gear 12 for driving. The driving gear 12 is driven by a motor through a driven gear, facilitating the rotation of the wire tube 1 to drive the scraping blade assemblies 3 to rotate and scrape off the tin liquid on the surface of the copper wire.

[0112] The toothed parts of the toothed rods 2 on both sides are arranged opposite to each other, and there is an adjusting gear 5 meshed with the toothed parts of the toothed rods 2 on both sides between them. There is an adjusting disk 6 for driving the rotation of the adjusting gear 5. When the adjusting disk 6 is rotated, at this time the adjusting gear 5 rotates, causing the toothed rods 2 on both sides to move in opposite directions. At this time, the distance between the cutting edges of the two scraping blade assemblies 3 will change, facilitating the surface tin scraping treatment of copper wires of different thicknesses.

[0113] The scraping blade assembly 3 includes a sleeve 31, a scraping blade arm 32 and a scraping blade head 33 connected in sequence. At the bottom of the toothed rod 2, there are a connecting rod 21 and a screw rod 4 for fixing the scraping blade assembly 3 in cooperation with the sleeve 31. The narrow diameter end of the connecting rod 21 is inserted into the sleeve 31, the rod part of the screw rod 4 is threadedly connected inside the narrow diameter end of the connecting rod 21, and the nut part abuts against the bottom of the sleeve 31. When the screw rod 4 is loosened, at this time the scraping blade assembly 3 is rotated. At this time, the sleeve 31 rotates on the outer wall of the connecting rod 21. After adjusting the angles of the two scraping blade heads 33 to appropriate positions, the screw rod 4 is tightened to fix the two scraping blade assemblies 3, avoiding inconvenience in scraping tin from the copper wire when adjusting the position of the cutting edge of the scraping blade assembly 3.

[0114] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the said element.

[0115] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A tinned copper wire production and processing process, characterized in that: The following steps are involved: S1: The copper rod is fed into a continuous extruder for extrusion to form a preliminary formed copper wire; S2: feeding the copper wire preliminarily formed in step S1 into a wire drawing machine for multi-stage drawing, gradually reducing its diameter until it reaches the required specifications, thereby obtaining a drawn copper wire; S3: the copper wire stretched in step S2 is annealed and tinned by passing through an annealing device and a tinning device. After the tinning, the copper wire passes through a scraper device, which rotates in a circular manner to remove excess tin liquid on the surface of the tinned copper wire, and then is dried; S4: winding the tinned copper wire in step S3 through a winding machine to form a desired coil; The annealing and tinning process of step S3 is as follows: S31, sending the drawn copper wire into a cleaning device with a degreasing agent to perform deep degreasing and impurity removal, and then washing it with running water; S32, sending the copper wire treated in step S31 into an annealing furnace for annealing, heating to 320-430° C., and maintaining for 30-40 minutes. After the annealing is completed, slowly cooling the copper wire to room temperature; S33, rinse the cooled copper wire after annealing in step S32 with running water, then send the copper wire into a pickling tank with pickling solution for activation treatment, the pickling time is 40-70 minutes, and finally rinse it with running water; S34, sending the copper wire activated in step S33 into a tinning solution for tinning treatment, the tinning temperature is 20-35°C, the current density is 0.3-0.5A / dm², and the tinning time is 4-8min; S35, removing excess plating solution from the copper wire after tinning in step S34 by scraper, and then sending the copper wire into a drying furnace for drying and curing, the drying temperature is 120-140° C., and the drying time is 5-12 minutes; S36, subjecting the copper wire dried and solidified in step S35 to cold air treatment to cool it to room temperature; The degreasing agent in step S31 is calculated by weight: 12-16 parts of fatty alcohol polyoxyethylene ether, 22-30 parts of polyethylene glycol, 50-70 parts of oleic acid, 5-10 parts of sodium nitrite, and deionized water. The mass concentration of the sum of fatty alcohol polyoxyethylene ether, polyethylene glycol, oleic acid and sodium nitrite in the degreasing agent is between 10% and 30%; The pickling solution in step S33 is calculated by mass: The pickling solution is composed of 18-22 parts of nitric acid, 3-5 parts of hydrofluoric acid, and deionized water. The pH of the pickling solution is between 3-4.

2. A tinned copper wire production and processing process as claimed in claim 1, characterized in that: The tin plating solution in step S34 is calculated by mass as follows: 20-30 parts of stannous sulfate, 42-75 parts of sulfuric acid, 9-15 parts of tartaric acid, 0.06-0.1 parts of inorganic salt, 1-2 parts of sulfite, 0.2-0.4 parts of citric acid, 0.1-0.4 parts of naphtholsulfonic acid, add deionized water to 1000 parts.

3. A tinned copper wire production and processing process as claimed in claim 2, characterized in that: The inorganic salt is a sodium salt or a potassium salt.

4. A tinned copper wire production and processing process as claimed in claim 2, characterized in that: The sulfite is sodium sulfite or sodium bisulfite.

5. A scraper device, adapted for use in a tinned copper wire production process according to any one of claims 1 to 4, characterized in that: It comprises a wire tube (1) for tinned copper wire to pass through, tooth rods (2) are symmetrically arranged on both sides of the wire tube (1), and scraper assemblies (3) for scraping off excess tin liquid on the surface of the tinned copper wire are arranged at the bottom of the tooth rods (2) on both sides, and the blades of the scraper assemblies (3) on both sides are arranged opposite to each other, and the distances from the blades of the scraper assemblies (3) on both sides to the axis of the wire tube (1) are equal; Limit blocks (11) are provided on both sides of the wire tube (1) for the rod portion of the gear rod (2) to slide, and a driving gear (12) is provided on the outer wall of the wire tube (1) for driving. The toothed portions of the gear rods (2) on both sides are arranged opposite to each other, and an adjusting gear (5) is provided between the two and meshed with the toothed portions of the gear rods (2) on both sides. The adjusting gear (5) is provided with an adjusting disk (6) for driving the adjusting gear (5) to rotate. The scraper assembly (3) comprises a sleeve (31), a scraper arm (32) and a scraper head (33) which are connected in sequence. A connecting rod (21) and a screw rod (4) which cooperate with the sleeve (31) to fix the scraper assembly (3) are provided at the bottom of the toothed rod (2). The narrow diameter end of the connecting rod (21) is inserted into the sleeve (31). The rod portion of the screw rod (4) is threadedly connected to the inside of the narrow diameter end of the connecting rod (21), and the nut portion abuts against the bottom of the sleeve (31).

Images