180-level self-adhesive polyurethane enameled wire production system

Abstract

The invention relates to the technical field of enameled wire production, in particular to a 180-level self-adhesive polyurethane enameled wire production system which comprises a wire drawing machine, an enameling machine and a winding machine, the enameling machine comprises a rack, a roller a, a first painting module, an oven, a roller b, a roller c, a second painting module and a roller d, the roller a, the roller b, the roller c and the roller d are arranged on four vertexes of a rectangle respectively, and the first painting module and the second painting module are arranged on the rack. The roller a, the roller b, the roller c and the roller d are arranged on the machine frame, enameled wires are wound on the roller a, the roller b, the roller c and the roller d, the enameled wires are spiral on the roller a, the roller b, the roller c and the roller d, the baking oven is arranged between the roller a and the roller b, and the first painting module and the second painting module are arranged on the left side and the right side of the baking oven respectively. The enamelled wire is painted and baked twice in one circle of winding, so that the number of circles of the enamelled wire is reduced, and the phenomenon of wire breakage is effectively avoided.

Description

Technical Field

[0001] The invention relates to the technical field of enameled wire production, in particular to a 180-grade self-adhesive polyurethane enameled wire production system. Background Art

[0002] Enameled wire is a branch of winding wire, which is composed of conductor (copper or aluminum) and insulation layer (such as polyurethane, polyester material). With the development of related technologies, the classification of enameled wire types has become more detailed, and it is usually rated according to its heat resistance. Therefore, multifunctional wires such as 180-grade self-adhesive polyurethane enameled wire have emerged. It not only has the ability to withstand high temperatures, but also the viscosity of its own insulation layer will be activated under high temperature conditions. After being wound as a coil, it does not need to be fixed by other means (such as gluing, wire bundling), so it is widely used inside motors.

[0003] According to the conveying direction during the enameled wire production process, it can be divided into vertical production system and horizontal production system. Compared with the vertical system, the horizontal system has a higher production speed and is more environmentally friendly, so it is more common. The horizontal production system usually includes five parts: wire drawing, annealing, painting, baking and cooling. In order to achieve the functionality of the wire paint film, painting and baking often need to be performed multiple times (for example, 180-level self-adhesive polyurethane enameled wire needs to be painted and baked at least three times: 1. In order to save costs, first apply a layer of low-cost polyurethane paint film on the surface of the wire; 2. After the polyurethane paint film is baked and cured, the modified polyurethane film is painted to improve the heat resistance of the enameled wire to meet the requirements of 180 levels; 3. After the modified polyurethane paint film is baked and cured, the self-adhesive layer is painted, and then the self-adhesive layer is baked and cured; of course, in order to improve the quality of painting, the above process can be performed more times). In the traditional linear production system, each additional set of painting and baking processes means that an additional set of painting devices and baking devices must be added, which will greatly increase the purchase and operation costs of the equipment. In addition, the production system is difficult to apply to small and medium-sized enterprises due to its own floor space.

[0004] In order to simplify the structure of the horizontal production system, the prior art improves the original linear production system to a circular direction through the "curve principle", so that the enameled wire can be painted and baked multiple times by passing through a set of painting devices and baking devices. For example, in the painting method and device of the enameling machine with the publication number CN104036882B, multiple paint tank bodies are arranged inside the paint tank, and the wire is spirally wound on multiple roller groups multiple times, so that the wire can pass through each paint tank body one by one and be painted multiple times.

[0005] However, in the existing horizontal annular production system, the enameled wire also acts as a conveyor belt after being wound around the roller group, and needs to drive multiple roller groups. Therefore, there are certain requirements for the wire diameter specifications to meet its own strength requirements. The specific function of the self-adhesive enameled wire is that it can be easily fixed when wound into a coil, so it is widely used inside micro motors. This also means that the wire diameter of this 180-level self-adhesive polyurethane enameled wire is usually very thin, generally between 0.022 and 0.062 mm. Therefore, using the existing horizontal annular production system to produce 180-level self-adhesive polyurethane enameled wire can simplify the structure of the production system, but "wire breakage" will occur.

[0006] In order to simplify the structure of the enameled wire production system and avoid the breakage of the enameled wire, a 180-grade self-adhesive polyurethane enameled wire production system is proposed. Summary of the invention

[0007] The purpose of the present invention is to provide a 180-grade self-adhesive polyurethane enameled wire production system, which solves the problem of wire breakage in the existing horizontal annular production system when producing thinner enameled wires. Through the effective action continuity principle, the enameled wire is painted and baked twice in one circle of winding, which reduces the number of enameled wire windings and effectively avoids wire breakage.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A 180-level self-adhesive polyurethane enameled wire production system comprises a wire drawing machine, an enameling machine and a winding machine, wherein the enameling machine comprises a frame, a roller a, a first painting module, a drying oven, a roller b, a roller c, a second painting module and a roller d, wherein the roller a, roller b, roller c and roller d are respectively arranged at four vertices of a rectangle, so that the wrap angles of the enameled wire on the roller a, roller b, roller c and roller d are all 90°, if the wrap angle is less than 90°, the friction between the enameled wire and the roller will be reduced but will not disappear, but will be transferred to the roller with a wrap angle greater than 90°, thereby causing the enameled wire to be more easily broken, and the roller a, roller b, roller c and roller d are wound with enameled wire, and the enameled wire is spirally shaped on the roller a, roller b, roller c and roller d, the drying oven is arranged between the roller a and the roller b, and the first painting module and the second painting module are respectively arranged on the left and right sides of the drying oven;

[0010] The enameled wire enters the enameling machine under the pulling force of the winding machine and passes through the first painting module and the baking furnace successively to complete the primary painting of one circle of winding. The enameled wire is pulled out from the inside of the baking furnace and is quickly cooled by the action of the baking furnace. The cooled enameled wire is turned by rollers b and c and passes through the second painting module and the baking furnace successively to complete the secondary painting of one circle of winding. The enameled wire that passes around roller a again passes through different positions of the first painting module according to the number of times of painting.

[0011] According to the existing method, when the enameled wire is painted only by the lower paint roller, the lower roller will lift the enameled wire upward for better painting effect, but this also means that the position of the enameled wire in the felt will be biased upward, thereby making the paint removal effect below weaker, resulting in uneven thickness of the enameled wire paint film;

[0012] Preferably, the first painting module comprises a motor, a paint bracket, an upper paint roller, a lower paint roller, a paint tank, a paint collecting plate and a felt group, the paint bracket is installed above the frame, the upper paint roller and the lower paint roller are sequentially connected to the inside of the paint bracket from top to bottom, the motor is connected to one end of the lower paint roller, the paint tank is provided on the paint bracket, and the paint tank is located below the lower paint roller, the paint collecting plate is connected to the right side of the paint bracket, and the felt group is arranged above the paint collecting plate;

[0013] Through the above scheme, with the help of the upper paint roller, the lower paint roller can be pressed against the enameled wire, and the enameled wire will not move upward, but always be located in the middle position in the felt group, so that the thickness of the enameled wire paint film is uniform. In addition, by passing from the upper part of the upper paint roller, or between the upper paint roller and the lower paint roller, the present invention can also perform even and odd number of painting respectively, which has a wider range of uses.

[0014] In order to adapt to production, the existing technology often opens more paint tanks to provide as many painting times as possible, so as to be compatible with more enameled wire varieties. However, when producing enameled wires with fewer painting times, the idling of multiple rollers on the lower paint roller inevitably causes unnecessary energy consumption;

[0015] Preferably, the lower paint roller comprises a front shaft, a middle shaft, a rear shaft, a static roller and an insertion rod, the front shaft, the middle shaft and the rear shaft are sequentially connected to the paint bracket from front to rear, and the front shaft and the middle shaft and the middle shaft and the rear shaft are rotationally connected, the motor is adjacent to the wire drawing machine outlet, and the motor is connected to the front shaft, a plurality of static rollers are respectively nested on the front shaft, the middle shaft and the rear shaft, a light hole is opened on the rear end of the front shaft and the rear end of the middle shaft, a threaded hole is opened on the front end of the middle shaft and the front end of the rear shaft, and the insertion rod is inserted into the adjacent light hole and the threaded hole and detachably connected;

[0016] Through the above scheme, the multiple static rollers on the lower paint roller have a clutch function. According to the production situation, the number of static rollers driven by the motor can be adjusted to reduce energy consumption. At the same time, the disconnected static roller will not continue to drive the paint roller, thereby avoiding the paint roller causing greater resistance to the enameled wire when painting an even number of times.

[0017] It can be seen that there are many forms of connection between the painting bracket, the roller shaft and the roller body, for example, a fixed connection between the roller shaft and the painting bracket, and between the roller shaft and the roller body, a rotational connection between the roller shaft and the painting bracket, a fixed connection between the roller shaft and the roller body, and a rotational connection between the roller shaft and the painting bracket, and between the roller shaft and the roller body. Compared with this scheme, the above scheme 1 does not require a rotational connection, that is, no bearing parts are required, which has certain advantages in production cost and installation. However, the roller body does not rotate, which will cause the enameled wire to be subjected to greater friction resistance when passing between the roller body and the static roller, thereby increasing the tension of the enameled wire. Therefore, this connection method is not conducive to the production of thin wires and has great limitations; the above scheme 2 is an optimization of scheme 1, using only one set of bearings The roller body can be rotated, taking into account both the cost and the control of the tension of the enameled wire. Although this connection method makes the roller body rotate, the multiple roller bodies move together with the roller shaft, which has the following effects: on the one hand, the inertia of the roller body and the roller shaft is large, and it is not easy to be driven by the rotation of the static roller, and the enameled wire will still be subject to large resistance when passing through; on the other hand, in this connection method, the rotation of multiple roller bodies is synchronous, and they rotate counterclockwise when viewed from the front. When the enameled wire passes over the roller body without painting, the movement direction of the enameled wire is opposite to the linear speed direction of the roller body when rotating counterclockwise, so it will be subject to large resistance; the multiple sets of rotating connections in the above scheme three increase the cost and are inconvenient to install. In addition, there is still the problem of synchronous rotation of multiple rollers in the above scheme two;

[0018] Preferably, the painting roller includes a roller shaft and a roller body, the front and rear ends of the roller shaft are fixed on the painting bracket, and the three roller bodies are rotatably connected to the roller shaft, so that each roller body is driven by a static roller and can rotate independently on the roller shaft, which avoids the problem of large inertia when the roller body and the roller shaft are linked, and does not cause too much resistance to the even-number winding production.

[0019] The enameled wire is held up by rollers a, b, c and d. It is kept horizontal by the tension of the winding machine during production. In order to evenly remove the paint on the surface of the enameled wire when passing through the felt group, the enameled wire should be kept in a horizontal state without tilting upward or downward, so that too much paint is removed from the upper or lower part of the enameled wire, resulting in uneven painting.

[0020] Preferably, the surface hardness of the static roller is greater than the surface hardness of the roller body. The surface hardness of the static roller is set to be larger so that the enameled wire will not sink significantly when passing between the roller body and the static roller, thereby avoiding uneven painting. At the same time, the surface hardness of the roller body is set to be smaller so that the contact area between the circumference of the roller body and the static roller is increased to ensure sufficient paint liquid between them, thereby achieving normal painting;

[0021] In addition, if the circumference of the roller body and the static roller are both flat, the enameled wire between the roller body and the static roller will be greatly squeezed, thus encountering resistance to movement and increasing its own tension.

[0022] Preferably, the diameter of the portion of the roller body circumference that is not in contact with the enameled wire is larger than the diameter of the portion of the roller body circumference that is in contact with the enameled wire, so that the roller body circumference is uneven and the enameled wire is located in the groove. When the raised portion on the roller body contacts the static roller, the paint liquid absorbed by the raised portion will be squeezed into the groove and adhere to the surface of the enameled wire, thereby achieving a good painting effect.

[0023] After the enameled wire comes out of the oven, it needs to go through a period of air cooling to harden the paint film.

[0024] Preferably, the oven is located at the center of roller a and roller b, and the shortest distance between the rollers on the first and second painting modules and the oven is equal. This arrangement can minimize the distance spanned by the enameled wire while ensuring the length of the air cooling zone, so as to avoid wire breakage. In addition, the shape of the oven body is usually a cube or a cylinder, and this shape with perpendicular faces is not conducive to the use of space;

[0025] Preferably, the profile of the oven in the front-to-back direction is a parallelogram, so that the air-cooling zone can be larger.

[0026] According to the principle of heat convection, when the oven is working, the air in the oven rises due to the heat, and the outside air will rush in to replenish the gas in the oven, which causes the oven to absorb cold air.

[0027] Preferably, the oven comprises an inlet and an outlet, the two inlets are respectively located at the upper left and lower right of the oven, the two outlets are respectively located at the upper right and lower left of the oven, the right side of the paint collecting plate is attached to the lower side of the left inlet of the oven, the felt group comprises a lower felt and an upper felt, the lower felt is connected to the upper side of the paint collecting plate, the right side of the upper felt is attached to the left side of the oven, and the upper felt is located above the lower felt, the enameled wire passes between the upper felt and the lower felt, and the thickness of the front and rear sections of the upper and lower felt is greater than the thickness of the middle section;

[0028] Through the above scheme, the upper felt and the lower felt are fitted at the entrance of the oven, and the thickness of the front and rear ends of the upper felt and the lower felt is larger to better prevent cold air from entering the oven from the entrance, thereby avoiding affecting the heating effect and energy consumption of the oven.

[0029] The enameled wire segments mounted by rollers c and d are arranged obliquely, and have a greater length than the enameled wire segments mounted by rollers a and b. The above-mentioned longer length includes a longer heating and curing distance in the oven and a longer air cooling interval;

[0030] Preferably, the second painting module has the same structural features as the first painting module, and the distance between the upper felt and the lower felt of the second painting module is greater than the distance between the upper felt and the lower felt of the second painting module, so that the second painting module can apply a thicker paint film when painting, thereby improving the efficiency of enameled wire painting.

[0031] The hot air in the oven will liquefy when it contacts the hot air from the outside, and gather into water droplets that are adsorbed on the inner wall of the oven.

[0032] Preferably, the upper wall of the outlet is provided with a toothed structure, which on the one hand blocks the cold air from entering the interior of the oven, and on the other hand allows the water droplets gathered at the outlet to fall along the toothed structure, thereby preventing the water droplets from falling on the enameled wire and causing paint nodules on the enameled wire whose surface paint film has not yet hardened. At the same time, with the help of the small gap formed by the toothed structure, the speed at which cold air is poured into the oven will increase, and the enameled wire coming out of the oven can be cooled with higher intensity to shorten the length of the air cooling interval, thereby reducing the cross-distance of the enameled wire to further avoid wire breakage. The lower wall of the outlet is provided with an inclined surface inclined toward the interior of the oven to discharge the water drawn out of the toothed structure on the upper wall of the outlet to the interior of the oven for drying. The enameled wire is located in the tooth gap of the upper wall of the outlet.

[0033] Rollers a, b, c and d are equivalent to fixed pulleys, which can only change the direction of the tension on the enameled wire, but cannot affect the magnitude of the tension. Their influence on the tension of the enameled wire is only due to the friction between themselves and the surface of the enameled wire.

[0034] Preferably, the a, b, c and d rollers are all rotatably connected to wire drums, and the material of the wire drums is a low-density wear-resistant material, so that the enameled wire can more easily drive the wire drum with smaller inertia while moving, thereby avoiding sliding friction, so as to reduce the resistance to the enameled wire, thereby reducing the tension of the enameled wire and avoiding wire breakage. The wire drum is provided with a slide groove matching the enameled wire to position the enameled wire.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] 1. The present invention adds and positions the second painting module, so that the enameled wire can be painted more times with fewer winding times during circumferential production, which effectively avoids wire breakage and improves the production efficiency of the enameled wire.

[0037] 2. The present invention designs the shape of the drying furnace to make the drying furnace and the first painting module and the second painting module more compact, thereby reducing the cross-length of the enameled wire, thereby reducing the tension added by the enameled wire's own gravity and allowing the enameling machine to have sufficient air-cooling length. The small gap formed by the toothed structure at the outlet of the drying furnace can be used to perform high-speed air cooling on the enameled wire emerging from the furnace, thereby improving the efficiency of cooling and solidifying the enameled wire.

[0038] 3. The present invention designs the paint roller of the second paint module on the first paint module, so that the enameled wire can be painted evenly and the number of painting times of the enameling machine is not restricted by odd or even numbers. The paint roller is driven by the lower paint roller with a clutch function (to reduce motor power consumption), which can effectively reduce the resistance to the enameled wire during odd and even painting times, thereby avoiding wire breakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the overall isometric structure of the present invention;

[0040] Figure 2 For the present invention Figure 1 The enlarged schematic diagram of part E in the middle;

[0041] Figure 3 It is a schematic diagram of the winding of the even-numbered painting of the present invention;

[0042] Figure 4 For the present invention Figure 2 The enlarged schematic diagram of part F in the middle;

[0043] Figure 5 It is a front view structural schematic diagram of the present invention;

[0044] Figure 6 It is a schematic diagram of the cross-sectional structure of the baking furnace of the present invention;

[0045] Figure 7 For the present invention Figure 6 The enlarged schematic diagram of the middle G part;

[0046] Figure 8 For the present invention Figure 6 Enlarged schematic diagram of part K in the middle.

[0047] In the figure: 1, wire drawing machine; 2, enameling machine; 20, roller frame; 21, frame; 22, a roller; 221, wire drum; 2211, slide; 23, first painting module; 231, motor; 232, painting bracket; 233, upper painting roller; 2331, roller shaft; 2332, roller body; 234, lower painting roller; 2341, front shaft; 2342, middle shaft; 2343, rear shaft; 23 44. Static roller; 2345. Insert rod; 2346. Light hole; 2347. Threaded hole; 235. Paint trough; 236. Paint collecting plate; 237. Felt group; 2371. Lower felt; 2372. Upper felt; 24. Baking furnace; 241. Inlet; 242. Outlet; 25. B roller; 26. C roller; 27. Second painting module; 28. D roller; 3. Winding machine; 4. Enameled wire. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] See also Figures 1 to 8 The present invention provides a 180-grade self-adhesive polyurethane enameled wire production system, and the technical solution is as follows:

[0050] A 180-grade self-adhesive polyurethane enameled wire production system comprises a wire drawing machine 1, an enameling machine 2 and a winding machine 3. The wire drawing machine 1 draws metal wires (such as copper with better conductivity, aluminum with lower quality) into wires of specified diameters, and winds the enameled wires 4 painted by the enameling machine 2 through the winding machine 3. The enameling machine 2 includes a frame 21, a roller 22, a first painting module 23, a baking oven 24, b roller 25, c roller 26, a second painting module 27 and d roller 28. The a roller 22, b roller 25, c roller 26 and d roller 28 are respectively arranged at the four vertices of a rectangle, and the a roller 22 and the d roller 28 are arranged on the same roller frame 20, and the b roller 25 and the c roller 26 are arranged on the same roller frame 20, so that the wrap angle of the enameled wire 4 on the a roller 22, b roller 25, c roller 26 and d roller 28 is 90°. If the wrap angle is less than 90°, the friction between the enameled wire 4 and the roller will be reduced but will not disappear. Instead, it will be transferred to the roller with a wrap angle greater than 90°, which will make the enameled wire 4 easier to break. The a roller 22, the b roller 25, the c roller 26 and the d roller 28 are all rotatably connected with a wire drum 221, the material of the wire drum 221 is a low-density wear-resistant material, such as silicon carbide ceramics, and the wire drum 221 is provided with a slide groove 2211 matching the enameled wire 4 to position the enameled wire 4. The number of wire drums 221 is arranged according to the production situation. The enameled wire 4 is spirally arranged on the a roller 22, the b roller 25, the c roller 26 and the d roller 28. The drying furnace 24 is arranged between the a roller 22 and the b roller 25, and the first painting module 23 and the second painting module 27 are arranged on the left and right sides of the drying furnace 24 respectively;

[0051] The enameled wire 4 is pulled by the winding machine 3 into the enameling machine 2 and passes through the first painting module 23 and the drying oven 24 to complete a single painting of a circle of winding. The enameled wire 4 is pulled out from the inside of the drying oven 24 and is quickly cooled by the action of the drying oven 24. The cooled enameled wire 4 is turned by the b roller 25 and the c roller 26 and passes through the second painting module 27 and the drying oven 24 to complete a secondary painting of a circle of winding. The enameled wire 4 that bypasses the a roller 22 again passes through different positions of the first painting module 23 according to the number of times of painting.

[0052] As an embodiment of the present invention, refer to Figure 1 and Figure 3 The first painting module 23 includes a motor 231, a paint bracket 232, an upper paint roller 233, a lower paint roller 234, a paint tank 235, a paint collecting plate 236 and a felt group 237. The paint bracket 232 is installed above the frame 21. The upper paint roller 233 and the lower paint roller 234 are sequentially connected to the inside of the paint bracket 232 from top to bottom. The motor 231 is connected to one end of the lower paint roller 234. The paint tank 235 is opened on the paint bracket 232, and the paint tank 235 is located below the lower paint roller 234. The paint collecting plate 236 is connected to the right side of the paint bracket 232, and the felt group 237 is arranged above the paint collecting plate 236;

[0053] According to the requirements of the paint layer, the painting can be divided into multiple times, which can be further divided into odd and even times. When the odd number of times is painted, the enameled wire 4 is painted according to Figure 1 However, when painting an even number of times, follow Figure 1 The winding method in the embodiment will cause the enameled wire 4 to undergo one more painting and baking, which is obviously not allowed. Therefore, this solution is given at this time. Figure 2 With the winding method in the embodiment, the enameled wire 4 is made to bypass the first painting module 23 and the oven 24 by means of the painting roller 233 , and therefore the highest point of the roller body 2332 is higher than the top of the oven 24 .

[0054] As an embodiment of the present invention, refer to Figure 2 and Figure 4 The lower paint roller 234 includes a front shaft 2341, a middle shaft 2342, a rear shaft 2343, a static roller 2344 and an insertion rod 2345. The front shaft 2341, the middle shaft 2342 and the rear shaft 2343 are connected to the paint bracket 232 in sequence from front to back, and the front shaft 2341 and the middle shaft 2342 and the middle shaft 2342 and the rear shaft 2343 are rotatably connected. The motor 231 is adjacent to the wire drawing machine 1 outlet, and the motor 231 is connected to the front shaft 2341. A plurality of static rollers 2344 are respectively nested on the front shaft 2341, the middle shaft 2342 and the rear shaft 2343. A light hole 2346 is opened on the rear end of the front shaft 2341 and the rear end of the middle shaft 2342, and a threaded hole is opened on the front end of the middle shaft 2342 and the front end of the rear shaft 2343. Hole 2347, the rod 2345 is inserted into the adjacent light hole 2346 and the threaded hole 2347 and is detachably connected; the painting roller 233 includes a roller shaft 2331 and a roller body 2332, the front and rear ends of the roller shaft 2331 are fixed on the painting bracket 232, and the three roller bodies 2332 are rotatably connected to the roller shaft 2331, and the fixed connection between the roller shaft 2331 and the painting bracket 232 is achieved by a snap-on method. Specifically, the front and rear ends of the roller shaft 2331 are milled into cubes to be snap-on to the painting bracket 232; the surface hardness of the static roller 2344 is greater than the surface hardness of the roller body 2332, and the diameter of the peripheral surface of the roller body 2332 that is not in contact with the enameled wire 4 is greater than the diameter of the peripheral surface of the roller body 2332 that is in contact with the enameled wire 4.

[0055] During installation, first place a static roller 2344 in the paint groove 235 at the front side, then insert the front shaft 2341 into the static roller 2344, and insert the front shaft 2341 into the paint bracket 232 for rotation connection, then place another static roller 2344 in the middle paint groove 235, and insert the middle shaft 2342 into the paint bracket 232 and then insert this static roller 2344, and arrange bearings between the middle shaft 2342 and the front shaft 2341 for rotation connection, and finally place another static roller 2344 in the paint groove 235 at the rear side, and insert the rear shaft 2343 into the paint bracket 232 is then inserted into this static roller 2344, and bearings are arranged between the rear shaft 2343 and the middle shaft 2342 and the paint bracket 232 for rotational connection; in addition, the light hole 2346 and the threaded hole 2347 are arranged in the paint groove 235 at the further rear side. For example, after the front shaft 2341 is installed, the light hole 2346 thereon should be located in the middle paint groove 235, and correspondingly, the threaded hole 2347 of the middle shaft 2342 is also arranged in the middle paint groove 235. Bolts can be used for the insertion rod 2345, and the threaded hole 2347 is a blind hole to prevent the paint liquid from clogging the threaded hole 2347.

[0056] As an embodiment of the present invention, refer to Figure 5 , the oven 24 is located at the center of the a roller 22 and the b roller 25, and the profile of the oven 24 in the front-to-back direction is a parallelogram, and the shortest distances between the roller bodies 2332 on the first painting module 23 and the second painting module 27 and the oven 24 are equal;

[0057] In this solution, the drying oven 24 is placed between the first painting module 23 and the second painting module 27. The enameled wire 4 is first painted by the first painting module 23 or the second painting module 27 before entering the drying oven 24, and then enters the drying oven 24 to heat and remove moisture from the paint liquid so that the paint film on the enameled wire 4 is solidified. After coming out of the drying oven 24, it undergoes a period of air cooling to harden the paint film. In the above process, if the position of the baking oven 24 is biased towards the first painting module 23 or the second painting module 27, the air cooling interval of the enameled wire 4 after being painted by the second painting module 27 or the first painting module 23 will be shortened, causing the paint film to harden insufficiently, resulting in paint film adhesion when contacting roller a 22, roller b 25, roller c 26 or roller d 28, affecting the painting effect of the enameled wire 4. If the air cooling interval continues to increase, the volume of the enameling machine 2 will be further increased, and the distance between the enameled wire 4 at the a roller 22 and the b roller 25 will be larger. Accordingly, the longer the distance spanned by the enameled wire 4 is, the easier it is to break the wire.

[0058] As an embodiment of the present invention, refer to Figures 6 to 8The oven 24 includes an inlet 241 and an outlet 242. The two inlets 241 are respectively located at the upper left and lower right of the oven 24. The two outlets 242 are respectively located at the upper right and lower left of the oven 24. The right side of the paint collecting plate 236 is attached to the lower side of the inlet 241 on the left side of the oven 24. The felt group 237 includes a lower felt 2371 and an upper felt 2372. The lower felt 2371 is connected to the upper side of the paint collecting plate 236. The right side of the upper felt 2372 is attached to the paint collecting plate 236. The left side of the oven 24, and the upper felt 2372 is located above the lower felt 2371, the enameled wire 4 passes between the upper felt 2372 and the lower felt 2371, and the thickness of the front and rear sections of the upper felt 2372 and the lower felt 2371 is greater than the thickness of the middle section; the lower felt 2371 is detachably connected to the paint collecting plate 236, and the upper felt 2372 slides on the side wall of the oven 24 to facilitate the replacement of the upper felt 2372 and the lower felt 2371. The second painting module 27 has the same structural features as the first painting module 23, and the spacing between the upper felt 2372 and the lower felt 2371 of the second painting module 27 is greater than the spacing between the upper felt 2372 and the lower felt 2371 of the second painting module 27, so that the second painting module 27 can apply a thicker paint film when painting, so as to improve the efficiency of painting the enameled wire 4. The enameled wire 4 passing over the roller body 2332 of the second painting module 27 is inclined, so the thickened portion of the roller body 2332 on the second painting module 27 is less than that on the first painting module 23. The upper wall of the outlet 242 is set as a tooth-shaped structure, and the lower wall of the outlet 242 is set as an inclined surface inclined toward the inside of the drying oven 24, and the enameled wire 4 is located in the tooth gap of the upper wall of the outlet 242. The water droplets guided by the tooth-shaped structure fall on the inclined surface of the lower wall, and the inclined surface guides the water droplets to the inside of the drying oven 24 to complete the drying, and at the outlet 242 on the right side, an additional stop bar is arranged to allow water to flow out from the two notches at the front and back along the stop bar to avoid the influence of water droplets on the enameled wire 4.

[0059] Working principle: The present invention adopts the effective action continuity principle, and adds a second painting module 27 on the basis of the original first painting module 23, so that the enameled wire 4 wound on the a roller 22, the b roller 25, the c roller 26 and the d roller 28 can be painted and baked twice in one winding;

[0060] Specifically, after the enameled wire 4 is pulled out of the wire drawing machine 1 by the pulling force of the winding machine 3, it enters between the upper paint roller 233 and the lower paint roller 234 of the first painting module 23 through the a roller 22 for painting, and then enters the felt group 237 for paint removal. To ensure uniform paint removal, the enameled wire 4 needs to be in a central position inside the felt group 237, and the enameled wire 4 is erected and kept horizontal by the a roller 22 and the b roller 25. To keep the enameled wire 4 horizontal, the circumference of the static roller 2344 of the lower paint roller 234 needs to have a high hardness. In order to ensure the effect of painting, the circumference of the roller body 2332 of the upper paint roller 233 is made soft, and in order to reduce the resistance of the enameled wire 4 when passing through, the part of the circumference of the roller body 2332 that is not in contact with the enameled wire 4 is made thick, so that the static roller 2344 can drive the roller body 2332 to rotate while squeezing the paint liquid absorbed by the thicker part of the roller body 2332 onto the surface of the enameled wire 4.

[0061] The enameled wire 4 painted by the felt group 237 enters the oven 24 from the inlet 241 on the left side, so that the paint film on the surface is heated and solidified inside the oven 24, and then discharged from the outlet 242 on the right side and air-cooled for a period of time. The purpose of air cooling is to cool and solidify the cured paint film to avoid adhesion during subsequent winding. In order to ensure thorough air cooling, the air cooling interval must have a certain length, but this interval will also increase the length of the enameled wire 4 between the roller a 22 and the roller b 25, thereby causing the enameled wire 4 to be The tension of 4 increases under the influence of its own gravity, which increases the probability of wire breakage. Therefore, in this solution, the drying oven 24 is designed as a parallelogram, which controls the cross-length of the enameled wire 4 while ensuring a sufficient length of air cooling interval. In addition, a tooth-shaped structure is arranged on the upper wall of the outlet 242. The small gap formed by the tooth-shaped structure can speed up the speed of cold air pouring into the drying oven 24, thereby using air cooling to improve the efficiency of air cooling of the enameled wire 4, so as to further shorten the air cooling interval, reduce the cross-length of the enameled wire 4, and reduce the probability of wire breakage.

[0062] The enameled wire 4 after cold solidification enters between the upper paint roller 233 and the lower paint roller 234 of the second painting module 27 through the b roller 25 and the c roller 26, and repeats the above process. In addition, because the enameled wire 4 mounted on the c roller 26 and the d roller 28 is tilted, the air cooling interval and the heating interval in the oven 24 are larger than the enameled wire 4 mounted on the a roller 22 and the b roller 25. Therefore, this part of the enameled wire 4 can be painted thicker to improve production efficiency. Therefore, in this solution, the spacing between the upper felt 2372 and the lower felt 2371 on the second painting module 27 is set larger;

[0063] The above-mentioned winding process is repeated until the last winding to roller a 22. At this time, the enameled wire 4 needs to select the winding method according to the number of painting times. If painting is performed for an even number of times, it will be wound over the roller body 2332. If painting is performed for an odd number of times, it will be wound between the roller body 2332 and the static roller 2344.

[0064] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A 180-grade self-adhesive polyurethane enameled wire production system, comprising a wire drawing machine (1), an enameling machine (2) and a winding machine (3), characterized in that: The enameling machine (2) comprises a frame (21), an a roller (22), a first painting module (23), a drying oven (24), a b roller (25), a c roller (26), a second painting module (27) and a d roller (28); the a roller (22), the b roller (25), the c roller (26) and the d roller (28) are respectively arranged at the four vertices of a rectangle, and the a roller (22), the b roller (25), the c roller (26) and the d roller (28) are wound with enameled wires (4); the enameled wires (4) are spirally wound on the a roller (22), the b roller (25), the c roller (26) and the d roller (28); the drying oven (24) is arranged between the a roller (22) and the b roller (25); the first painting module (23) and the second painting module (27) are respectively arranged on the left and right sides of the drying oven (24); The enameled wire (4) is pulled by the winding machine (3) into the enameling machine (2) and passes through the first painting module (23) and the drying oven (24) to complete a first painting of a circle of winding. The enameled wire (4) is pulled out from the inside of the drying oven (24) and is quickly cooled by the action of the drying oven (24). After cooling, the enameled wire (4) is turned by the b roller (25) and the c roller (26) and passes through the second painting module (27) and the drying oven (24) to complete a second painting of a circle of winding. The enameled wire (4) that bypasses the a roller (22) again passes through different positions of the first painting module (23) according to the number of times of painting.

2. A 180-grade self-adhesive polyurethane enameled wire production system according to claim 1, characterized in that: The first painting module (23) comprises a motor (231), a paint support (232), an upper paint roller (233), a lower paint roller (234), a paint trough (235), a paint collecting plate (236) and a felt group (237); the paint support (232) is installed above the frame (21); the upper paint roller (233) and the lower paint roller (234) are sequentially connected to the inside of the paint support (232) from top to bottom; the motor (231) is connected to one end of the lower paint roller (234); the paint trough (235) is opened on the paint support (232), and the paint trough (235) is located below the lower paint roller (234); the paint collecting plate (236) is connected to the right side of the paint support (232); and the felt group (237) is arranged above the paint collecting plate (236).

3. A 180-grade self-adhesive polyurethane enameled wire production system according to claim 2, characterized in that: The lower paint roller (234) comprises a front shaft (2341), a middle shaft (2342), a rear shaft (2343), a static roller (2344) and a plug rod (2345); the front shaft (2341), the middle shaft (2342) and the rear shaft (2343) are sequentially connected to the paint support (232) from front to back, and the front shaft (2341) and the middle shaft (2342) and the middle shaft (2342) and the rear shaft (2343) are rotationally connected; the motor (231) is adjacent to the wire drawing machine (1) outlet, and the motor (231) Connected to the front shaft (2341), the plurality of static rollers (2344) are respectively nested on the front shaft (2341), the middle shaft (2342) and the rear shaft (2343); a light hole (2346) is provided on the rear end of the front shaft (2341) and the rear end of the middle shaft (2342); a threaded hole (2347) is provided on the front end of the middle shaft (2342) and the front end of the rear shaft (2343); the insertion rod (2345) is inserted into the adjacent light holes (2346) and the threaded holes (2347) to make a detachable connection.

4. A 180-grade self-adhesive polyurethane enameled wire production system according to claim 3, characterized in that: The painting roller (233) comprises a roller shaft (2331) and a roller body (2332), the front and rear ends of the roller shaft (2331) are fixed on the painting bracket (232), and the three roller bodies (2332) are all rotatably connected to the roller shaft (2331).

5. A 180-grade self-adhesive polyurethane enameled wire production system according to claim 4, characterized in that: The surface hardness of the static roller (2344) is greater than the surface hardness of the roller body (2332), and the diameter of the portion of the circumference of the roller body (2332) that is not in contact with the enameled wire (4) is greater than the diameter of the portion of the circumference of the roller body (2332) that is in contact with the enameled wire (4).

6. A 180-grade self-adhesive polyurethane enameled wire production system according to claim 4, characterized in that: The drying oven (24) is located at the center of roller a (22) and roller b (25), and the outline of the drying oven (24) in the front-to-back direction is a parallelogram, and the shortest distances between the roller bodies (2332) on the first painting module (23) and the second painting module (27) and the drying oven (24) are equal.

7. A 180-grade self-adhesive polyurethane enameled wire production system according to claim 6, characterized in that: The drying oven (24) comprises an inlet (241) and an outlet (242), the two inlets (241) are respectively located at the upper left and lower right of the drying oven (24), the two outlets (242) are respectively located at the upper right and lower left of the drying oven (24), the right side of the paint collecting plate (236) is attached to the lower side of the inlet (241) on the left side of the drying oven (24), the felt group (237) comprises a lower felt (2371), an upper felt (2372) The lower felt (2371) is connected to the top of the paint collecting plate (236), the right side of the upper felt (2372) is in contact with the left side of the drying furnace (24), and the upper felt (2372) is located above the lower felt (2371), the enameled wire (4) passes between the upper felt (2372) and the lower felt (2371), and the thickness of the front and rear sections of the upper felt (2372) and the lower felt (2371) is greater than the thickness of the middle section.

8. A 180-grade self-adhesive polyurethane enameled wire production system according to claim 7, characterized in that: The second painting module (27) has the same structural features as the first painting module (23), and the distance between the upper felt (2372) and the lower felt (2371) of the second painting module (27) is greater than the distance between the upper felt (2372) and the lower felt (2371) of the second painting module (27).

9. A 180-grade self-adhesive polyurethane enameled wire production system according to claim 7, characterized in that: The upper wall of the outlet (242) is configured as a tooth-shaped structure, and the lower wall of the outlet (242) is configured as an inclined surface inclined toward the inside of the oven (24), and the enameled wire (4) is located in the tooth gap of the upper wall of the outlet (242).

10. A 180-grade self-adhesive polyurethane enameled wire production system according to claim 1, characterized in that: The a roller (22), the b roller (25), the c roller (26) and the d roller (28) are all rotatably connected to a wire drum (221); the wire drum (221) is made of a low-density wear-resistant material, and a slide groove (2211) matching the enameled wire (4) is provided on the wire drum (221).

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