Self-lubricating 155-grade polyester enameled copper round wire and production equipment thereof

Abstract

The application discloses self-lubricating 155-grade polyester enameled copper round wire and belongs to the technical field of enameled wire production. The self-lubricating 155-grade polyester enameled copper round wire comprises a wire core, a polyester primer layer, a nylon paint layer and a self-lubricating layer. The application further provides a production device for the self-lubricating 155-grade polyester enameled copper round wire, which comprises a front centering mechanism, a polyester paint tank, a first drying cylinder, a nylon paint tank, a pure water coagulation bath tank, an ammonia water coagulation bath tank, a second drying cylinder and a rear centering mechanism. The application utilizes the solvation of calcium chloride in methanol. After water is added, the calcium chloride and the methanol form a complex, and the complex has a complexation effect on the polyamide. The polyamide has poor solubility in water, and the surface layer rapidly forms a dense layer. The surface layer is a kind of touch-dry layer, has high smoothness, forms a mirror-like effect with a certain glossiness, and has self-lubricating performance, electric shock resistance and heat resistance that are obviously higher than those of the enameled wire with nylon as a lubricating layer in the prior art.

Description

Technical Field

[0001] This application relates to the field of enameled wire production technology, and in particular to self-lubricating grade 155 polyester enameled copper round wire and its production equipment. Background Technology

[0002] The winding process for wire coils typically employs high-speed winding machines. During winding, the enameled wire is subjected to friction and impact, making its insulation layer highly susceptible to mechanical damage and resulting in a significant decrease in insulation performance. Lubrication of enameled wire mainly includes the following: 1) Applying lubricants: including paraffin wax, silicone oil, beeswax, etc.; 2) Applying self-lubricating varnish, most typically using high-strength polyamide-imide materials; 3) Applying nylon varnish.

[0003] Applying lubricant can easily cause uneven lubrication, and it can easily lose its lubricating properties if stored or used for too long. Self-lubricating paint has a higher coating temperature, a more complex coating process, and a higher cost. Among them, coating with nylon paint is the cheapest and most practical, mainly because nylon has a very low coefficient of friction in film formation, which provides good protection for the insulation layer of 155 grade enameled wire.

[0004] Currently, a 1-3μm thick layer of nylon varnish is typically applied to the outside of the insulation layer. However, because the nylon varnish layer is too thin, it is often damaged during secondary recycling or winding (such as winding an electromagnet). Summary of the Invention

[0005] In order to improve the structural stability and performance of existing nylon-lubricated enameled wires, this application provides self-lubricating grade 155 polyester enameled copper round wire and its production equipment.

[0006] The specific technical solution adopted is as follows: The self-lubricating grade 155 polyester enameled copper round wire includes a conductor core, a polyester primer layer covering the conductor core, and a nylon enamel layer covering the polyester primer layer. The characteristic feature is that the outer surface of the nylon enamel layer forms a self-lubricating layer through a coagulation bath.

[0007] Preferably, the outer layer of the polyester primer layer is serrated to facilitate the coating of nylon paint.

[0008] Preferably, the thickness of the polyester primer layer is 8-12% of the conductor core diameter, the thickness of the nylon paint layer is 7-10% of the conductor core diameter, and the thickness of the self-lubricating layer is 1.4-3 μm.

[0009] Preferably, the nylon paint layer is formed by coating and drying a nylon paint slurry. The nylon paint slurry comprises the following components in parts by weight: 100 parts polyamide resin, 10-30 parts chopped glass fiber, 10.2-15 parts film-forming aid, 3-7 parts pigment, and the remainder being calcium chloride and methanol. The weight ratio of calcium chloride to polyamide resin is 2.0-2.5:1, and the weight-volume ratio of calcium chloride to methanol is 25g / 100mL.

[0010] By adopting the above technical solution, an appropriate amount of methanol ensures the complete solubility of calcium chloride, polyamide resin, and film-forming aids, as well as the viscosity of the slurry, ensuring that it can coat the polyester primer layer. The chopped glass fibers are ultrasonically cleaned before use, and then dried to ensure a clean, dust-free surface. The preferred film-forming aid is polyvinylpyrrolidone, which promotes film formation and also has thickening, thermal stabilizing, and dispersion-promoting effects. The range of pigments is wide, including black, silver, gold, and even other colors used in special enameled wires. When using carbon black and cobalt black, using 5.5 parts carbon black and 0.4 parts cobalt black per 100 parts of polyamide resin equivalent can form a black, viscous slurry, which can be passed through the wire and extruded through the exit mold to form the final product.

[0011] Furthermore, the preparation process of nylon paint slurry is as follows: At a constant temperature of 65℃, calcium chloride and methanol are added to the reactor and stirred until completely dissolved; after pulverizing the polyamide resin, it is added to the reactor and stirred until completely dissolved; film-forming aid is added and stirred until completely dissolved; short glass fibers and pigments are added. If it is necessary to enhance hardness and high temperature resistance, inorganic additives such as flame retardants, ceramic powders, colorants, etc. can be added, and the mixture is stirred at high speed until a homogeneous slurry is formed.

[0012] By adopting the above technical solution, after the nylon lacquer slurry is coated, it is subjected to a pure water coagulation bath. The solvent methanol in the slurry undergoes gradient exchange with water, and the water concentration gradually decreases from the outside to the inside, while the polyamide concentration gradually decreases from the inside to the outside. The interior has a microporous skeleton structure. After passing through a 30% ammonia water bath, the uncoagulated viscous slurry inside is further coagulated, making the surface denser. The pH value is adjusted so that the calcium ions inside produce calcium hydroxide, which fills the micropores and makes the surface denser. After drying, a relatively dense and smooth self-lubricating layer is formed on the surface, and white dots are uniformly embedded on the surface. The white dots are mainly composed of calcium hydroxide and calcium carbonate, and can be ultrasonically polished to obtain a smooth, non-porous, continuous, spotless, bubble-free, and impurity-free mirror surface. The internal microporous skeleton structure plays a role in heat insulation, and the produced inorganic calcium hydroxide component improves the flame retardancy and high temperature resistance. More importantly, the microporous skeleton structure greatly enhances the dielectric properties of the enameled wire, improves the insulation performance and electrical breakdown resistance.

[0013] Preferably, the polyester primer layer is selected from the polyester paste used in the QZ-2 / 155 type polyester enameled wire produced by Xiangtan Wuyi Wire Factory.

[0014] By adopting the above technical solution, this application uses this as an example to demonstrate the feasibility of coating a nylon paint layer on the outside of a polyester primer layer.

[0015] Preferably, the polyamide includes at least one of PA6, PA66, PA46, or PA610.

[0016] By adopting the above technical solution, the enameled wire can be screened according to its heat resistance temperature level. Among them, PA610 has the highest temperature resistance, up to 200℃, but its solubility in methanol is relatively low. Therefore, when using it, it is necessary to consider increasing the amount of thickener or changing the composition of the thickener.

[0017] By adopting a coagulation bath method, the resulting nylon coating layer has a honeycomb microporous skeleton structure with an internal pore size ranging from 0.1 to 12 μm, a porosity of 35-42%, a water content of less than 5%, a porosity of less than 1% for the self-lubricating layer, and an external surface gloss greater than 85, which can reach over 88 after ultrasonic polishing.

[0018] To obtain the aforementioned cable structure, this application also proposes a production equipment for self-lubricating 155-grade polyester enameled copper round wire, including a tooling table for coating copper wire raw materials. The upper surface of the tooling table is arranged sequentially from the production direction as follows: a front centering mechanism, a polyester enamel tank, a first drying cylinder, a nylon enamel tank, a pure water coagulation bath, an ammonia coagulation bath, a second drying cylinder, and a rear centering mechanism. The polyester enamel tank, the first drying cylinder, the nylon enamel tank, the pure water coagulation bath, the ammonia coagulation bath, and the second drying cylinder are all provided with through holes for copper wire raw materials to pass through. The front centering mechanism and the rear centering mechanism respectively clamp the copper wire raw materials so that the axis of the copper wire raw materials coincides with the center position of the copper wire raw materials passing through the through holes, thereby achieving a centering effect and making the enamel layer more evenly distributed on the outside of the copper wire raw materials.

[0019] By adopting the above technical solution, the copper wire raw material is centered by the front centering mechanism and the rear centering mechanism, and then passes through the polyester paint tank, the first drying cylinder, the nylon paint tank, the pure water coagulation bath, the ammonia coagulation bath and the second drying cylinder in sequence. That is, it goes through polyester primer coating, primary drying, nylon paint coating, pure water coagulation bath soaking and shaping to form a self-lubricating layer, ammonia coagulation bath soaking and repair of the self-lubricating layer to make the surface smoother, and secondary tunnel drying.

[0020] Furthermore, the installation structure of the production equipment for self-lubricating grade 155 polyester enameled copper round wire is as follows: The polyester paint tank, the first drying cylinder, the nylon paint tank, the pure water coagulation bath, the ammonia coagulation bath, and the second drying cylinder are all rectangular columnar hollow structures. The length direction of the polyester paint tank, the nylon paint tank, and the ammonia coagulation bath is perpendicular to the length direction of the copper wire raw material. The two sides of the polyester paint tank, the nylon paint tank, and the ammonia coagulation bath with through holes are respectively provided with liquid receiving grooves I. The upper surface of the tooling table is provided with transverse sliding grooves that slide and engage with the polyester paint tank, the nylon paint tank, and the ammonia coagulation bath. The bottom wall of the transverse sliding grooves is provided with equally spaced screw holes. A limiting block is attached to the lower part of each end face of the polyester paint tank, the nylon paint tank, and the ammonia coagulation bath. Any limiting block is fixed in the screw hole of the transverse sliding groove by bolts. The above three tanks are installed by sliding and pushing. Each pure water coagulation bath has a liquid receiving tank II at the bottom of both ends of the through hole. The outer wall of the liquid receiving tank II fixes multiple pure water coagulation baths together. The ends of the two liquid receiving tanks II are connected to sliders by T-shaped rods. The upper surface of the tooling table is provided with a longitudinal sliding groove that cooperates with the sliding of the slider. The slider slides longitudinally through the drive mechanism, so that the through hole at the tail end of the pure water coagulation bath moves, squeezes, and grinds the paint layer to form a more compact and smooth coagulated paint film. The front centering mechanism, the first drying cylinder, the second drying cylinder, and the rear centering mechanism are fixed to the tooling table by directly welding the bottom edge or by fixing the angle iron frame and then screwing them together.

[0021] By adopting the above technical solution, each mechanism can be installed on the tooling table, and the lateral position of the nylon paint tank, ammonia coagulation bath tank and polyester paint tank can be adjusted to facilitate the alignment adjustment of each through hole; the pure water coagulation bath tank can slide back and forth, which facilitates the forming through hole at the tail to extrude and form the inside of the coated nylon paint layer, resulting in a more stable internal porous structure and self-lubricating layer, and friction polishing to make the surface smoother.

[0022] Furthermore, the parameter control and structure of the production equipment for self-lubricating grade 155 polyester enameled copper round wire are as follows: The top surface of the polyester paint tank is equipped with a polyester paint inlet pipe, and the side surface of the polyester paint tank is equipped with an overflow pipe I, which is used to control the liquid level of the polyester slurry in the polyester paint tank. The top surface of the first drying cylinder is equipped with a hot air inlet pipe I near the tail edge. The inlet air temperature is 50-90℃ and the inlet air velocity is a low flow rate of 0.05-5m / s, depending on the coating thickness and the inlet speed. The front end face of the first drying cylinder is equipped with an outlet pipe I to form convection drying. The top surface of the nylon paint tank is equipped with a nylon paint inlet pipe, and the side of the nylon paint tank is equipped with an overflow pipe II, which is used to control the liquid level of polyamide slurry in the nylon paint tank. The inner wall of the nylon paint tank is also equipped with a heating plate to maintain the slurry coating temperature at 65℃. A pure water inlet pipe is provided at the edge of the top surface of the pure water coagulation bath near the tail end. The inlet water temperature is 20-30℃. The water flow rate in the pure water coagulation bath is a low flow velocity of 0.5-2m / s. A water outlet pipe is provided at the bottom of the front end of the pure water coagulation bath to form a counter-convective coagulation bath contact with the copper wire raw material. The top surface of the ammonia coagulation bath is equipped with an ammonia inlet pipe, which contains an ammonia solution with a temperature of 70℃ and a concentration of 30%. The side of the ammonia coagulation bath is equipped with an overflow pipe III, which is used to control the ammonia level and ensure that the ammonia is always in a circulating state. The second drying cylinder has a hot air inlet pipe II near the tail edge on its top surface. The inlet air temperature is 90-110℃, and the inlet air velocity is a low flow rate of 0.05-5m / s, depending on the coating thickness and the inlet velocity. The bottom of the front end face of the second drying cylinder has an outlet pipe II, which forms convective drying. The length of the second drying cylinder is greater than that of the first drying cylinder, forming a tunnel kiln drying, thus creating a significant humidity and temperature gradient along the length. The outlet air temperature is controlled below 85℃, which greatly improves the drying efficiency under low volatility conditions.

[0023] By adopting the above technical solution, the overflow setting ensures that the coating liquid level is maintained at a better level during the coating process. The counter-convection coagulation bath contact method makes the water concentration of the copper wire raw material gradually increase from front to back, which is conducive to the formation of a mesoporous structure with the pore size decreasing from the inside to the outside, and finally forms a relatively dense self-lubricating layer. By adding 30% ammonia solution, on the one hand, it affects the further nucleation of the remaining uncoagulated polyamide molecular chains, and on the other hand, it produces calcium hydroxide from the complexed calcium ions, which coats the secondary structure of the polyamide molecular chains, resulting in calcification and coagulation, and gradually fills the internal mesoporous structure to make it more robust. During the reaction, the residual methanol and water in the mesopores are gradually squeezed out, and the water content of the entire coating layer is greatly reduced.

[0024] Furthermore, the centering method for products in the production equipment for self-lubricating grade 155 polyester enameled copper round wire is as follows: The front centering mechanism includes horizontal rollers that clamp copper wire raw materials from the top and bottom and vertical rollers that clamp copper wire raw materials from the left and right. Vertical columns are respectively connected to the roller shafts at both ends of the horizontal rollers. The sides of the vertical columns are provided with strip holes I for the roller shafts at both ends of the horizontal rollers to slide up and down. Horizontal columns are respectively connected to the roller shafts at both ends of the vertical rollers, and the sides of the two vertical columns and the sides of the two horizontal columns are fixed together to form a closed frame. The upper horizontal column is provided with strip holes II for the roller shaft at the top of the vertical rollers to slide left and right. A positioning slider is fixed to the bottom roller shaft of the vertical rollers. The width of the positioning slider is the same as the diameter of the bottom roller shaft of the vertical rollers. The upper surface of the lower horizontal column is provided with a T-shaped groove for the bottom roller shaft of the vertical rollers and the positioning slider to slide and cooperate. The positioning slider and the inner wall of the T-shaped groove are coated with lubricating oil to keep the center line of the vertical rollers vertical. A spiral-shaped fluorescent frame is provided outside the side through-hole at the front of the polyester paint tank. The spiral-shaped fluorescent frame is tangent to the side through-hole at the front of the polyester paint tank. A spiral-shaped fluorescent frame is also provided outside the through-hole at the tail end of the second drying cylinder. The rear centering mechanism has the same structure as the front centering mechanism, and the four sides of the spiral-shaped fluorescent frame are vertical or parallel. The height of the copper wire material is adjusted by two vertical rollers, and the horizontal position of the copper wire material is adjusted by two horizontal rollers, forming a square. The center of the square is on the same straight line as the center of each through-hole. Before entering the production line, based on the raw copper wire material and the final diameter of the coated copper wire, adjust one vertical roller and one horizontal roller in the rear centering mechanism and the front centering mechanism. Through parallel light projection, make the vertical roller and the horizontal roller cover one side of the circular fluorescent frame respectively. Fix the vertical roller and the horizontal roller and determine the center position according to the product diameter and mark them respectively. At this time, a laser is shone into the center position marked by the front centering mechanism, and the laser landing point of the rear centering mechanism is also the marked center position. Mark the center of each through hole with white paper, and then verify whether the laser beam is at the center of each through hole. If not, it is necessary to adjust the installation position and installation method of each component. The actual installation method is controlled by the processing, and only the rear centering mechanism and the front centering mechanism need to be adjusted. After centering, the remaining vertical and horizontal rollers are installed before the wire enters the line, so that both the raw copper wire and the finished copper wire after coating can pass through.

[0025] By adopting the above technical solution, the front centering mechanism, the rear centering mechanism, the adjacent circular fluorescent frame, and the parallel light projection can quickly determine the center position of each through hole. Then, by correcting with laser straight lines, it can be determined that the above production equipment meets the production requirements and the resulting product has a uniform paint layer, thus realizing a precise and scientific production line.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. This application utilizes the solubilization effect of calcium chloride in methanol. Upon contact with water, calcium chloride forms a complex with methanol and also complexes with polyamide. When the weight ratio of calcium chloride to polyamide resin is 2.0-2.5:1, calcium chloride and polyamide resin are essentially complexed, resulting in no crystallization in the nylon coating layer. This produces a coagulation bath effect, i.e., alcohol-water exchange. Furthermore, since polyamide has poor solubility in water, a dense layer is rapidly formed on the surface, which is also a touch-drying layer. It has high smoothness and forms a near-mirror effect with a certain gloss. After drying and molding, its self-lubricating performance is significantly higher than that of self-lubricating enameled wires using nylon as the lubricating layer in the prior art.

[0027] 2. To obtain the aforementioned self-lubricating cable surface structure, this application also proposes production equipment for self-lubricating 155-grade polyester enameled copper round wire, including a polyester varnish tank, a first drying cylinder, a nylon varnish tank, a pure water coagulation bath, an ammonia coagulation bath, and a second drying cylinder. The copper wire raw material sequentially undergoes polyester primer coating, primary drying, nylon varnish coating, immersion in a pure water coagulation bath and shaping to form a self-lubricating layer, immersion in an ammonia coagulation bath to repair the self-lubricating layer and make the surface smoother, and secondary tunnel drying, resulting in a self-lubricating layer of about 1.4 μm. The thickness of this layer is close to that of the existing nylon enameled wire lubricating layer, but its structure is more dense and smooth, the coefficient of friction is significantly reduced, and the anti-electric breakdown performance is more outstanding.

[0028] 3. This application also uses a front centering mechanism and a rear centering mechanism to clamp the copper wire material so that the axis of the copper wire material coincides with the center position of the copper wire material passing through the through hole, thereby achieving a centering effect and making the enamel layer more evenly distributed on the outside of the copper wire material. Attached Figure Description

[0029] Figure 1 This is a diagram of the coating structure of the self-lubricating grade 155 polyester enameled copper round wire proposed in this application; Figure 2 This is a perspective view of the production equipment for self-lubricating grade 155 polyester enameled copper round wire proposed in this application; Figure 3 yes Figure 2 Enlarged view of point A; Figure 4 This is a front view of the production equipment for self-lubricating grade 155 polyester enameled copper round wire proposed in this application; Figure 5 This is a side view of the production equipment for self-lubricating grade 155 polyester enameled copper round wire proposed in this application; Figure 6 This is a schematic diagram of the through hole on the front side of the polyester enamel tank in the production equipment for self-lubricating grade 155 polyester enameled copper round wire proposed in this application. Figure 7 This is a schematic diagram of the structure of the through hole on the rear side of the polyester enamel tank in the production equipment for self-lubricating grade 155 polyester enameled copper round wire proposed in this application. Figure 8 This is a perspective view of the front centering mechanism in the production equipment for self-lubricating grade 155 polyester enameled copper round wire proposed in this application; Figure 9 This is a schematic diagram of the connection structure between the positioning slider and the T-shaped groove in the front centering mechanism of the production equipment for self-lubricating grade 155 polyester enameled copper round wire proposed in this application.

[0030] Explanation of reference numerals in the attached figures: 1. Copper wire raw material; 101. Conductor core; 102. Polyester primer layer; 103. Nylon paint layer; 104. Self-lubricating layer; 2. Tooling table; 3. Front centering mechanism; 31. Horizontal rollers; 32. Vertical rollers; 33. Vertical column; 34. Slot hole I; 35. Horizontal column; 36. Slot hole II; 37. Positioning slider; 38. T-shaped groove; 4. Polyester paint tank; 41. Polyester paint inlet pipe; 42. Overflow pipe I; 43. U-shaped fluorescent frame; 5. First drying cylinder; 51. Hot air inlet pipe I; 52. Air outlet pipe 1; 6. Nylon paint tank; 61. Nylon paint inlet pipe; 62. Overflow pipe II; 7. Pure water coagulation bath; 71. Pure water inlet pipe; 72. Water outlet pipe; 8. Ammonia coagulation bath; 81. Ammonia inlet pipe; 82. Overflow pipe III; 9. Second drying cylinder; 91. Hot air inlet pipe II; 92. Air outlet pipe II; 10. Rear centering mechanism; 11. Liquid receiving tank I; 12. Transverse slide groove; 13. Screw hole; 14. Limiting block; 15. Bolt; 16. Liquid receiving tank II; 17. T-shaped rod; 18. Sliding block; 19. Longitudinal slide groove. Detailed Implementation

[0031] The following is in conjunction with the appendix Figures 1-9 To further elaborate on this application, it should be noted that the term "front" in this application refers to the direction closer to the feed side of copper wire raw material 1, i.e. Figure 2 The left-hand direction; the "back" refers to the direction closer to the outlet side of copper wire raw material 1, i.e. Figure 2 The right-hand direction; in this application, "lateral" refers to a straight line direction parallel to the length direction of the copper wire material 1, and "longitudinal" refers to a straight line direction perpendicular to the length direction of the copper wire material 1 and parallel to the surface of the tooling table.

[0032] Example 1: Reference Figures 2-5 This embodiment uses the following production equipment for self-lubricating 155 grade polyester enameled copper round wire, including a tooling table 2 for coating copper wire raw material 1. The upper surface of the tooling table 2 is arranged sequentially from the production direction as follows: a front centering mechanism 3, a polyester paint tank 4, a first drying cylinder 5, a nylon paint tank 6, a pure water coagulation bath 7, an ammonia coagulation bath 8, a second drying cylinder 9, and a rear centering mechanism 10. Both sides of the polyester paint tank 4, the first drying cylinder 5, the nylon paint tank 6, the pure water coagulation bath 7, the ammonia coagulation bath 8, and the second drying cylinder 9 are provided with through holes for the copper wire raw material 1 to pass through. The front centering mechanism 3 and the rear centering mechanism 10 respectively clamp the copper wire raw material 1 so that the axis of the copper wire raw material 1 coincides with the center position of the copper wire raw material 1 passing through the through hole, thereby achieving the centering effect and making the paint layer more evenly distributed on the outside of the copper wire raw material 1.

[0033] Reference Figures 2-5 The installation structure of the production equipment for self-lubricating grade 155 polyester enameled copper round wire is as follows: The polyester paint tank 4, the first drying cylinder 5, the nylon paint tank 6, the pure water coagulation bath 7, the ammonia coagulation bath 8, and the second drying cylinder 9 are all square columnar hollow structures. The length direction of the polyester paint tank 4, the nylon paint tank 6, and the ammonia coagulation bath 8 is perpendicular to the length direction of the copper wire raw material 1. The two sides of the polyester paint tank 4, the nylon paint tank 6, and the ammonia coagulation bath 8 with through holes are respectively provided with liquid receiving grooves I11. The upper surface of the tooling table 2 is provided with transverse sliding grooves 12 that slide and cooperate with the polyester paint tank 4, the nylon paint tank 6, and the ammonia coagulation bath 8 respectively. The bottom wall of the transverse sliding groove 12 is provided with equally spaced screw holes 13. A limiting block 14 is attached to the lower part of each end face of the polyester paint tank 4, the nylon paint tank 6, and the ammonia coagulation bath 8. Any limiting block 14 is fixed to the transverse sliding groove 12 by bolts 15. In screw hole 13; the above three tanks are installed by sliding and pushing; each of the two ends of the pure water coagulation bath 7 has a liquid receiving tank II16 at the bottom. The outer wall of the liquid receiving tank II16 fixes multiple pure water coagulation baths 7 together. The ends of the two liquid receiving tanks II16 are connected to sliders 18 by T-shaped rods 17. The upper surface of the tooling table 2 is provided with a longitudinal sliding groove 19 that cooperates with the slider 18. The slider 18 slides longitudinally through the drive mechanism, so that the through hole at the tail end of the pure water coagulation bath 7 moves, squeezes and grinds the paint layer to form a more compact and smooth coagulated paint film. The front centering mechanism 3, the first drying cylinder 5, the second drying cylinder 9 and the rear centering mechanism 10 are fixed to the tooling table 2 by directly welding the bottom edge or fixing the angle iron frame and then connecting with screws.

[0034] Reference Figures 6-7 The front side of the polyester paint tank 4 has round holes, while the rear side has serrated holes, which improves the coating effect of the subsequent nylon paint slurry.

[0035] Reference Figure 2 , 8 The centering method for products in the production equipment for self-lubricating 155-grade polyester enameled copper round wire is as follows: The front centering mechanism 3 includes horizontal rollers 31 that clamp the copper wire material 1 vertically and vertically, and vertical rollers 32 that clamp the copper wire material 1 horizontally and vertically. Vertical columns 33 are respectively connected to the roller shafts at both ends of the horizontal rollers 31. The sides of the vertical columns 33 are provided with strip-shaped holes I34 for the roller shafts at both ends of the horizontal rollers 31 to slide up and down. Horizontal columns 35 are respectively connected to the roller shafts at both ends of the vertical rollers 32, and the sides of the two vertical columns 33 and the two horizontal columns 35 are fixedly connected together to form a closed frame. The upper horizontal column 35 is provided with strip-shaped holes II36 for the top roller shaft of the vertical rollers 32 to slide left and right. A fixed guide is fixed to the bottom roller shaft of the vertical rollers 32. Positioning slider 37, the width of which is the same as the diameter of the bottom roller shaft of the vertical roller 32, is provided on the upper surface of the horizontal column 35 located below, with a T-shaped groove 38 for sliding cooperation between the bottom roller shaft of the vertical roller 32 and the positioning slider 37, and the inner wall of the positioning slider 37 and the T-shaped groove 38 are coated with lubricating oil to keep the axis of the vertical roller 32 vertical; a spiral fluorescent frame 43 is provided outside the side through hole at the front of the polyester paint tank 4, and the spiral fluorescent frame 43 is tangent to the side through hole at the front of the polyester paint tank 4. A spiral fluorescent frame 43 is also provided outside the through hole at the tail end face of the second drying cylinder 9. The rear centering mechanism 10 is structurally similar to the front centering mechanism 3. The same, and the four sides of the circular fluorescent frame 43 are vertical or parallel. The height of the copper wire material 1 is adjusted by two vertical rollers 32, and the horizontal position of the copper wire material 1 is adjusted by two horizontal rollers 31, forming a square. The center of the square and the center of each through hole are on the same straight line. Before the wire enters, according to the copper wire material 1 and the final diameter of the copper wire after coating, one vertical roller 32 and one horizontal roller 31 in the rear centering mechanism 10 and the front centering mechanism 3 are adjusted. By parallel light projection, the vertical roller 32 and the horizontal roller 31 respectively cover one side of the circular fluorescent frame 43, and the vertical roller 32 and the horizontal roller 31 are fixed. The horizontal rollers 31 are positioned according to the product diameter and marked accordingly. At this time, a laser is injected into the center position marked by the front centering mechanism 3, and the laser landing point of the rear centering mechanism 10 is also the marked center position. The center of each through hole is marked with white paper, and then it is verified whether the laser beam is at the center of each through hole. If not, the installation position and installation method of each component need to be adjusted. The actual installation method is controlled by the machining process, and only the rear centering mechanism 10 and the front centering mechanism 3 need to be adjusted. After centering, the remaining vertical rollers 32 and horizontal rollers 31 are installed after the wire is fed in, so that both the copper wire raw material 1 and the final coated copper wire finished product can pass through.

[0036] The parameters in this embodiment are controlled as follows: 1) The polyester primer layer 102 is selected from the polyester paste used in the QZ-2 / 155 type polyester enameled wire produced by Xiangtan Wuyi Wire Factory; 2) The inlet air temperature of the first drying cylinder 5 is 90℃, and the inlet air velocity is 0.05m / s; 3) The coating temperature of the nylon paint slurry in nylon paint tank 6 is 65℃. The preparation process of the nylon paint slurry is as follows: At a constant temperature of 65℃, 100L of methanol and 25Kg of high-purity (>97%) calcium chloride powder are added to the reactor and stirred until completely dissolved; 12.5Kg of PA6 resin is crushed and added to the reactor and stirred until completely dissolved; 1.5Kg of polyvinylpyrrolidone is added and stirred until completely dissolved; 3Kg of chopped glass fiber, 0.55Kg of carbon black and 0.04Kg of cobalt black pigment are added and stirred at high speed until a homogeneous slurry is formed. 4) The inlet water temperature of the pure water coagulation bath 7 is 20℃, and the water flow rate in the pure water coagulation bath 7 is a low flow velocity of 2m / s. 5) The ammonia coagulation bath 8 contains an ammonia solution with a temperature of 70℃ and a concentration of 30%; 6) The inlet air temperature of the second drying cylinder 9 is 110℃, the inlet air velocity is a low flow velocity of 0.05m / s, the outlet air temperature is 75.1℃, and the temperature difference between the inlet and outlet is relatively large.

[0037] 7) Select round copper wire raw material with a diameter of 0.1mm, polyester primer layer 102 thickness of 8.2μm, nylon paint layer 103 thickness (excluding self-lubricating layer 104) of 9.8μm, and self-lubricating layer 104 thickness of 1.6μm.

[0038] 8) The obtained nylon paint layer 103 has a honeycomb microporous skeleton structure with an internal pore size range of 0.1-12μm, a porosity of 36.8%, and a water content of less than 5%. The porosity of the self-lubricating layer 104 is less than 1%, and its outer surface gloss is 85.2 (measured at a 60-degree incident angle), which can reach 88.2 after ultrasonic polishing.

[0039] Reference Figure 1 The product obtained in this embodiment is a self-lubricating grade 155 polyester enameled copper round wire, including a conductor core 101, a polyester primer layer 102 covering the conductor core 101, and a nylon varnish layer 103 covering the primer layer 103. The outer surface of the nylon varnish layer 103 forms a self-lubricating layer 104 through a coagulation bath.

[0040] Example 2: Using the same production equipment as in Example 1, the parameters for this example are controlled as follows: 1) The polyester primer layer 102 is selected from the polyester paste used in the QZ-2 / 155 type polyester enameled wire produced by Xiangtan Wuyi Wire Factory; 2) The inlet air temperature of the first drying cylinder 5 is 50℃ and the inlet air velocity is 5m / s; 3) The coating temperature of the nylon paint slurry in nylon paint tank 6 is 65℃. The preparation process of the nylon paint slurry is as follows: At a constant temperature of 65℃, 100L of methanol and 25Kg of high-purity (>97%) calcium chloride powder are added to the reactor and stirred until completely dissolved; 10Kg of PA610 resin is crushed and added to the reactor and stirred until completely dissolved; 1.02Kg of polyvinylpyrrolidone is added and stirred until completely dissolved; 1Kg of chopped glass fiber, 0.55Kg of carbon black and 0.04Kg of cobalt black pigment are added and stirred at high speed until a homogeneous slurry is formed.

[0041] 4) The inlet water temperature of the pure water coagulation bath 7 is 30℃, and the water flow rate in the pure water coagulation bath 7 is a low flow velocity of 0.5m / s. 5) The ammonia coagulation bath 8 contains an ammonia solution with a temperature of 70℃ and a concentration of 30%; 6) The inlet temperature of the second drying cylinder 9 is 90℃, the inlet air velocity is a low flow velocity of 5m / s, the outlet air temperature is 81.2℃, and the temperature difference between the inlet and outlet is small.

[0042] 7) Select round copper wire with a diameter of 0.1 mm, polyester primer layer 102 with a thickness of 8.2 μm, nylon paint layer 103 with a thickness of 10 μm, and self-lubricating layer 104 with a thickness of 1.4 μm.

[0043] 8) The obtained nylon paint layer 103 has a honeycomb microporous skeleton structure with an internal pore size range of 0.1-12μm, a porosity of 41.5%, and a water content of less than 5%. The porosity of the self-lubricating layer 104 is less than 1%, and its outer surface gloss is 86.1 (measured at a 60-degree incident angle). After ultrasonic polishing, it can reach above 89.0 (measured at a 60-degree incident angle).

[0044] Example 3: Using the same production equipment as in Example 1, the parameters for this example are controlled as follows: 1) The polyester primer layer 102 is selected from the polyester paste used in the QZ-2 / 155 type polyester enameled wire produced by Xiangtan Wuyi Wire Factory; 2) The inlet air temperature of the first drying cylinder 5 is 70℃ and the inlet air velocity is 1m / s; 3) The coating temperature of the nylon paint slurry in nylon paint tank 6 is 65℃. The preparation process of the nylon paint slurry is as follows: At a constant temperature of 65℃, 100L of methanol and 25Kg of high-purity (>97%) calcium chloride powder are added to the reactor and stirred until completely dissolved; 11.5Kg of PA66 resin is crushed and added to the reactor and stirred until completely dissolved; 1.3Kg of polyvinylpyrrolidone is added and stirred until completely dissolved; 2Kg of chopped glass fiber, 0.55Kg of carbon black and 0.04Kg of cobalt black pigment are added and stirred at high speed until a homogeneous slurry is formed.

[0045] 4) The inlet water temperature of the pure water coagulation bath 7 is 25℃, and the water flow rate in the pure water coagulation bath 7 is a low flow velocity of 1m / s. 5) The ammonia coagulation bath 8 contains an ammonia solution with a temperature of 70℃ and a concentration of 30%; 6) The inlet air temperature of the second drying cylinder 9 is 100℃, the inlet air velocity is a low flow velocity of 1m / s, and the outlet air temperature is controlled at 76.5℃.

[0046] 7) Select round copper wire raw material with a diameter of 0.1mm, polyester primer layer 102 with a thickness of 8.2μm, nylon paint layer 103 with a thickness of 9.9μm, and self-lubricating layer 104 with a thickness of 1.5μm.

[0047] 8) The obtained nylon coating layer 103 has a honeycomb microporous skeleton structure with an internal pore size range of 0.1-12μm, a porosity of 40.2%, and a water content of less than 5%. The porosity of the self-lubricating layer 104 is less than 1%, and its outer surface gloss is greater than 86.0 (measured at a 60-degree incident angle). If ultrasonically polished, it can reach 88 (measured at a 60-degree incident angle).

[0048] Example 4: Using the same production equipment as in Example 1, the parameters for this example are controlled as follows: 1) The polyester primer layer 102 is selected from the polyester paste used in the QZ-2 / 155 type polyester enameled wire produced by Xiangtan Wuyi Wire Factory; 2) The inlet air temperature of the first drying cylinder 5 is 80℃, and the inlet air velocity is 0.5m / s; 3) The coating temperature of the nylon paint slurry in nylon paint tank 6 is 65℃. The preparation process of the nylon paint slurry is as follows: At a constant temperature of 65℃, 100L of methanol and 25Kg of high-purity (>97%) calcium chloride powder are added to the reactor and stirred until completely dissolved; 10.5Kg of PA46 resin is crushed and added to the reactor and stirred until completely dissolved; 1.2Kg of polyvinylpyrrolidone is added and stirred until completely dissolved; 1.5Kg of chopped glass fiber, 0.55Kg of carbon black and 0.04Kg of cobalt black pigment are added and stirred at high speed until a homogeneous slurry is formed.

[0049] 4) The inlet water temperature of the pure water coagulation bath 7 is 25℃, and the water flow rate in the pure water coagulation bath 7 is a low flow velocity of 0.5m / s. 5) The ammonia coagulation bath 8 contains an ammonia solution with a temperature of 70℃ and a concentration of 30%; 6) The inlet air temperature of the second drying cylinder 9 is 100℃, the inlet air velocity is a low flow velocity of 0.5m / s, and the outlet air temperature is controlled at 73.7℃.

[0050] 7) Select round copper wire with a diameter of 0.1 mm, polyester primer layer 102 with a thickness of 8.2 μm, nylon paint layer 103 with a thickness of 10 μm, and self-lubricating layer 104 with a thickness of 1.4 μm.

[0051] 8) The obtained nylon paint layer 103 has a honeycomb microporous skeleton structure with an internal pore size range of 0.1-12μm, a porosity of 38.2%, and a water content of less than 5%. The porosity of the self-lubricating layer 104 is less than 1%, and its outer surface gloss is greater than 85.8 (measured at a 60-degree incident angle). If ultrasonically polished, it can reach 88 (measured at a 60-degree incident angle).

[0052] Comparative Example 1: The same production equipment as in Example 1 is used, except that the pure water coagulation bath 7 is always in a fixed position.

[0053] Comparative Example 2: The same production equipment as in Example 1 is used, except that the ammonia coagulation bath 8 is removed, and the second drying cylinder 9 and the rear centering mechanism 10 are moved forward accordingly.

[0054] Comparative Example 3: The same production equipment as in Example 1 is used, except that the pure water coagulation bath 7 and the ammonia coagulation bath 8 are removed, and the second drying cylinder 9 and the rear centering mechanism 10 are moved forward accordingly.

[0055] Comparative Example 4: The same production equipment as in Example 1 is used, except that the nylon paint tank 6, pure water coagulation bath 7, ammonia coagulation bath 8 and second drying cylinder 9 are removed. The centering mechanism 10 is moved forward accordingly, and the through hole on the rear side of the polyester paint tank 4 is the same as the inner diameter of the through hole on the rear side of the ammonia coagulation bath 8 in Example 1, that is, the paint layer thickness is the same.

[0056] Data Analysis: Referencing the GB / T6109 testing standard, as shown in Table 1: Table 1. Performance Test Results of the Enamelled Wire Obtained in This Application Example 1 0.1 8.2 9.8 1.6 85.2 0.041453 180±5 190±5 5.1 Example 2 0.1 8.2 10 1.4 86.1 0.040657 250±5 260±5 5.2 Example 3 0.1 8.2 9.9 1.5 86.0 0.041004 200±5 210±5 5.3 Example 4 0.1 8.2 10 1.4 85.8 0.040859 230±5 250±5 5.0 Comparative Example 1 0.1 8.2 9.8 1.6 76.2 0.095453 170±5 180±5 4.2 Comparative Example 2 0.1 8.2 9.8 1.6 54.8 0.110769 160±5 165±5 4.4 Comparative Example 3 0.1 8.2 11.4 - 69.3 0.075458 180±5 190±5 4.1 Comparative Example 4 0.1 19.6 - - 33.4 0.141578 160±5 160±5 3.2 Experiments show that the coagulation bath of polyamide can form a smooth self-lubricating layer, which can significantly reduce the friction force on high-speed winding and can also appropriately improve the heat resistance, insulation and dielectric properties of enameled wire.

[0057] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. Production equipment for self-lubricating grade 155 polyester enameled copper round wire, including a tooling table (2) for coating copper wire raw material (1); the self-lubricating grade 155 polyester enameled copper round wire includes a conductor core (101), a polyester primer layer (102) covering the conductor core (101), and a nylon enamel layer (103) covering the polyester primer layer (102), characterized in that: The self-lubricating 155 grade polyester enameled copper round wire also includes a self-lubricating layer (104) formed on the outer surface of the nylon enamel layer (103) through a coagulation bath. The nylon paint layer (103) is specifically formed by coating and drying a nylon paint slurry. The nylon paint slurry comprises the following components by weight: 100 parts polyamide resin, 10-30 parts chopped glass fiber, 10.2-15 parts film-forming aid, 3-7 parts pigment, and the remainder being calcium chloride and methanol. The weight ratio of calcium chloride to polyamide resin is 2.0-2.5:1, and the weight-volume ratio of calcium chloride to methanol is 25g / 100mL. The self-lubricating layer (104) is formed on the surface of the nylon paint layer (103) by a pure water coagulation bath and an ammonia coagulation bath. The upper surface of the tooling table (2) is provided with a front centering mechanism (3), a polyester paint tank (4), a first drying cylinder (5), a nylon paint tank (6), a pure water coagulation bath (7), an ammonia coagulation bath (8), a second drying cylinder (9), and a rear centering mechanism (10) in sequence from the production direction. Both sides of the polyester paint tank (4), the first drying cylinder (5), the nylon paint tank (6), the pure water coagulation bath (7), the ammonia coagulation bath (8), and the second drying cylinder (9) are provided with through holes for copper wire raw material (1) to pass through. The front centering mechanism (3) and the rear centering mechanism (10) respectively clamp the copper wire raw material (1) so that the axis of the copper wire raw material (1) coincides with the center position of the copper wire raw material (1) passing through the through hole. The nylon paint tank (6) contains the nylon paint slurry. The pure water coagulation bath (7) can slide back and forth.

2. The production equipment for self-lubricating 155-grade polyester enameled copper round wire according to claim 1, characterized in that: The thickness of the polyester primer layer (102) is 8-12% of the diameter of the conductor core (101), the thickness of the nylon paint layer (103) is 7-10% of the diameter of the conductor core (101), and the thickness of the self-lubricating layer (104) is 1.4-3 μm.

3. The production equipment for self-lubricating 155-grade polyester enameled copper round wire according to claim 1, characterized in that: The polyamide resin includes at least one of PA6, PA66, PA46, or PA610.

4. The production equipment for self-lubricating 155-grade polyester enameled copper round wire according to claim 1, characterized in that: The preparation process of the nylon paint slurry is as follows: calcium chloride and methanol are added to the reactor at a constant temperature of 65°C and stirred until completely dissolved; polyamide resin is pulverized and added to the reactor and stirred until completely dissolved; film-forming aid is added and stirred until completely dissolved; short glass fibers and pigments are added and stirred at high speed until a homogeneous slurry is formed.

5. The production equipment for self-lubricating 155-grade polyester enameled copper round wire according to claim 1, characterized in that: The polyester paint tank (4), nylon paint tank (6) and ammonia coagulation bath (8) have liquid receiving grooves I (11) on the middle of their two sides with through holes. The upper surface of the tooling table (2) is provided with transverse sliding grooves (12) that slide and cooperate with the polyester paint tank (4), nylon paint tank (6) and ammonia coagulation bath (8) respectively. The bottom wall of the transverse sliding groove (12) is provided with equally spaced screw holes (13). The lower part of the two end faces of the polyester paint tank (4), nylon paint tank (6) and ammonia coagulation bath (8) are respectively attached to a limiting block (14). Any of the limiting blocks (14) is fixed in the transverse sliding groove (12). Each of the pure water coagulation baths (7) has a liquid receiving tank II (16) at the bottom of both ends of the through hole. The outer wall of the liquid receiving tank II (16) fixes multiple pure water coagulation baths (7) together. The ends of the two liquid receiving tanks II (16) are connected to sliders (18) by T-shaped rods (17). The upper surface of the tooling table (2) is provided with a longitudinal sliding groove (19) that slides and cooperates with the sliders (18).

6. The production equipment for self-lubricating 155-grade polyester enameled copper round wire according to claim 1, characterized in that: The top surface of the polyester paint tank (4) is provided with a polyester paint inlet pipe (41), and the side surface of the polyester paint tank (4) is provided with an overflow pipe I (42); the top surface of the first drying cylinder (5) is provided with a hot air inlet pipe I (51) on the edge of the side of the nylon paint tank (6), and the bottom of the end face of the first drying cylinder (5) near the polyester paint tank (4) is provided with an air outlet pipe I (52); the top surface of the nylon paint tank (6) is provided with a nylon paint inlet pipe (61), and the side surface of the nylon paint tank (6) is provided with an overflow pipe II (62); the top surface of the pure water coagulation bath (7) is near the ammonia coagulation bath. (8) A pure water inlet pipe (71) is provided on one side edge, and a water outlet pipe (72) is provided at the bottom of the end face of the pure water coagulation bath (7) near the nylon paint tank (6); an ammonia inlet pipe (81) is provided on the top surface of the ammonia coagulation bath (8), and an overflow pipe III (82) is provided on the side of the ammonia coagulation bath (8); a hot air inlet pipe II (91) is provided on the edge of the top surface of the second drying cylinder (9) near the rear centering mechanism (10), and an air outlet pipe II (92) is provided at the bottom of the end face of the second drying cylinder (9) near the ammonia coagulation bath (8).

7. The production equipment for self-lubricating 155-grade polyester enameled copper round wire according to claim 1, characterized in that: The front centering mechanism (3) includes a horizontal roller (31) that clamps the copper wire material (1) from the top and bottom and a vertical roller (32) that clamps the copper wire material (1) from the left and right. The roller shafts at both ends of the horizontal roller (31) are respectively connected to vertical columns (33). The side of the vertical column (33) is provided with a strip hole I (34) for the roller shafts at both ends of the horizontal roller (31) to slide up and down. The roller shafts at both ends of the vertical roller (32) are respectively connected to horizontal columns (35). The upper horizontal column (35) is provided with a strip hole II (36) for the top roller shaft of the vertical roller (32) to slide left and right. The bottom roller shaft of the vertical roller (32) is fixedly connected to a positioning slider (37). The upper surface of the lower horizontal column (35) is provided with a T-shaped groove (38) for the positioning slider (37) to slide and cooperate. The polyester paint tank (4) has a side through hole near the front centering mechanism (3) with a spiral fluorescent frame (43) outside the side through hole, and the spiral fluorescent frame (43) is tangent to the side through hole at the front of the polyester paint tank (4). The second drying cylinder (9) is also provided with a circular fluorescent frame (43) outside the end face through hole near the rear centering mechanism (10). The rear centering mechanism (10) has the same structure as the front centering mechanism (3).

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