Enameled wire paint film baking and curing device and using method thereof

Abstract

The invention belongs to the technical field of varnished wire manufacturing, and particularly relates to a varnished wire paint film baking and curing device and a using method thereof.The varnished wire paint film baking and curing device comprises a baking oven and an oven door arranged on the side wall of the baking oven, a wire inlet is formed in one side of the baking oven, a wire outlet is formed in the other side of the baking oven, and the varnished wire paint film baking and curing device further comprises a first self-adaptive guide mechanism and a second self-adaptive guide mechanism, the first self-adaptive guide mechanisms are arranged on the side wall of the baking oven and located on the upper side and the lower side of the wire inlet; the second self-adaptive guide mechanisms are arranged on the side wall of the baking oven, and the second self-adaptive guide mechanisms are located on the upper side and the lower side of the wire outlet. Through the integrated design of segmented gradient baking, wire diameter self-adaptive temperature control and paint liquid diversion, collection and alarm, accurate and stable baking and curing of paint films of enameled wires with different wire diameters are achieved, the forming quality and production universality of the paint films are effectively improved, meanwhile, paint coating abnormity can be monitored in time, and the intelligent level of baking and curing of the enameled wires is greatly improved.

Description

Technical Field

[0001] This invention belongs to the field of enameled wire manufacturing technology, and in particular relates to an enameled wire coating baking and curing device and its usage method. Background Technology

[0002] Enamelled wire is the core insulating conductor of motors, electronic components and other equipment. The quality of baking and curing of its enamel film directly determines the insulation performance, mechanical strength and service life of the product. The core principle of enamel film baking and curing is to fully evaporate the organic solvent in the wet enamel film by precise temperature control, and at the same time promote the cross-linking reaction of the enamel base resin to form a dense and firm solid insulating film layer, such as the enamel film baking and curing device for enamelled wire disclosed in announcement number CN115798827A.

[0003] In actual production, the larger the diameter of the enameled wire, the thicker the corresponding enamel film is designed, and the greater the heat capacity of the wire core itself. The resistance to heat transfer to the inner layer of the enamel film increases accordingly. If the baking temperature is not adapted to the wire diameter requirements, the solvent in the thick enamel film is difficult to completely evaporate, and the resin cross-linking reaction is insufficient, which easily leads to incomplete curing of the enamel film, poor adhesion, and defects such as bulging, cracking, and insulation breakdown during use. On the other hand, when the wire diameter is small, excessively high temperatures will cause the enamel film to be over-cured, brittle, and cracked. Therefore, the wire diameter and baking temperature must be matched accordingly to ensure that the enamel film of enameled wires of different specifications is uniformly cured. However, existing enameled wire enamel film baking and curing devices cannot accurately adjust the baking temperature according to the diameter of the enameled wire, and can only achieve a rough increase or decrease in the overall temperature. They lack precise temperature control logic for different wire diameters, which seriously affects product consistency and pass rate.

[0004] To address this, a device for baking and curing enameled wire film and its usage method are proposed. Summary of the Invention

[0005] The purpose of this invention is to address the above-mentioned problems by providing an enameled wire coating baking and curing device and its usage method.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a baking and curing device for enameled wire film, comprising a baking oven and a door disposed on the side wall of the baking oven, wherein one side of the baking oven is provided with a wire inlet and the other side of the baking oven is provided with a wire outlet, and further comprising:

[0007] A first adaptive guiding mechanism is disposed on the side wall of the baking oven, and the first adaptive guiding mechanism is located on the upper and lower sides of the inlet.

[0008] The second adaptive guide mechanism is disposed on the side wall of the baking oven, and the second adaptive guide mechanism is located on the upper and lower sides of the outlet.

[0009] The baking tube is located horizontally inside the baking oven, and the top and bottom of the baking tube are fixedly connected to the top and bottom of the baking oven.

[0010] A baking mechanism is located on top of the baking oven, and the output end of the baking mechanism is connected to the baking tube;

[0011] A wire diameter detection mechanism is disposed on one side of the first adaptive guide mechanism and moves synchronously with the first adaptive guide mechanism. It is used to detect the diameter of the enameled wire. The baking mechanism adaptively adjusts the baking temperature according to the wire diameter value detected by the wire diameter detection mechanism.

[0012] A paint collection mechanism is installed inside the baking oven, and the paint collection mechanism is located below one side of the baking tube;

[0013] The PLC controller is fixedly installed on the side wall of the baking oven, and the baking mechanism, wire diameter detection mechanism and paint collection mechanism are all electrically connected to the PLC controller.

[0014] Preferably, the first adaptive guiding mechanism includes a housing fixedly mounted on the side wall of the baking oven, with two housings located on the upper and lower sides of the inlet, respectively. A sliding plate is vertically slidably mounted inside the housing. A spring is fixedly mounted between the upper surface of the sliding plate and the top inner wall of the housing. A connecting rod extending to the bottom of the housing is fixedly mounted on the lower surface of the sliding plate. A U-shaped plate is fixedly mounted at the lower end of the connecting rod. A guide roller is rotatably mounted inside the U-shaped plate. The structure of the first adaptive guiding mechanism is the same as that of the second adaptive guiding mechanism.

[0015] Preferably, the baking mechanism includes a fan fixedly mounted on the top of the baking oven. The output end of the fan is respectively fixedly provided with a first air supply pipe and a second air supply pipe extending to both sides. The pipe walls of the first air supply pipe and the second air supply pipe are respectively fixedly provided with a first heater and a second heater. The pipe walls of the first air supply pipe and the second air supply pipe are respectively fixedly provided with a first air volume regulating valve and a second air volume regulating valve. The ends of the first air supply pipe and the second air supply pipe away from the fan are respectively fixedly connected to both sides of the baking tube.

[0016] Preferably, the baking tube has a hollow structure, with one side of the baking tube being a preheating zone and the other side being a baking zone. An annular heat insulation plate is fixedly installed inside the baking tube to separate the preheating zone and the baking zone. The preheating zone has an inclined structure. Multiple evenly distributed air blowers are fixedly installed on the inclined inner wall of the baking tube, and air blowers are fixedly installed at the ends of the multiple air blowers away from the inner wall of the baking tube.

[0017] Preferably, the blower head is a hexagonal air duct, and a strip-shaped air outlet is provided on the side of the blower head away from the air duct.

[0018] Preferably, the wire diameter detection mechanism includes a cover fixedly mounted on the side wall of the housing, a resistance rod vertically fixed inside the cover, a conductive ring slidably mounted on the rod wall of the resistance rod, an insulating connecting block fixedly mounted on the outer wall of the conductive ring, and one side of the insulating connecting block being fixedly connected to one side of the slide plate.

[0019] Preferably, the paint collection mechanism includes a collection box fixedly installed on the inner wall of the bottom of the baking oven, the collection box having a collection hopper inside, and a weighing sensor fixedly installed between the bottom of the collection hopper and the inner wall of the bottom of the collection box.

[0020] A method for using an enameled wire coating baking and curing apparatus, the method comprising the following steps:

[0021] S1: Threading preparation. The staff manually opens the oven door and inserts the enameled wire, which has completed the coating process, into the oven through the inlet. The wire passes through the guide roller of the first adaptive guide mechanism, the preheating zone and baking zone of the baking tube, and the guide roller of the second adaptive guide mechanism in sequence. The wire then extends outward from the outlet. The enameled wire end extending out of the oven is then fixedly connected to the external winding device. After processing, the oven door is closed.

[0022] S2: Equipment start-up. The operator issues a start-up command through the PLC controller to simultaneously start the fan, first heater and second heater of the baking mechanism, and adjusts the opening of the first air volume regulating valve and the second air volume regulating valve according to the process requirements. The preheating temperature of the first heater is set to 80-150℃ and the baking temperature of the second heater is set to 200-420℃.

[0023] S3: Gradient baking. The fan blows outside air into the first air supply pipe and the second air supply pipe. After the airflow exchanges heat with the first heater and the second heater, it forms gradient hot air. It is blown towards the surface of the enameled wire through the blower pipe and blower head in the baking pipe. The enameled wire first passes through the preheating zone to complete the wet paint film leveling and preliminary shaping, and then passes through the baking zone to complete the deep cross-linking and curing of the paint film. The cured enameled wire is wound up at a uniform speed by the winding device.

[0024] S4: Adaptive temperature control for wire diameter. During the threading and traction of the enameled wire, the upper and lower guide rollers are pushed to generate relative displacement, which drives the connecting rod and the slide plate to slide inside the housing. Simultaneously, the insulating connecting block and the conductive ring are pulled to slide along the resistance rod, changing the effective resistance value of the resistance rod connected to the circuit. The PLC controller adaptively adjusts the output power of the first heater and the second heater according to the change of the electrical signal.

[0025] S5: Paint monitoring and alarm. During the baking and curing process, if an abnormality occurs in the painting process and causes paint to drip, the inclined structure of the preheating zone will guide the paint to the collection hopper of the paint collection mechanism. The weighing sensor will detect the weight change of the collection hopper in real time and transmit the data to the PLC controller. The PLC controller will immediately trigger an alarm to remind the staff to check and adjust the painting process parameters.

[0026] Compared with existing technologies, the advantages of this invention are as follows:

[0027] 1. Through the baking tube, baking mechanism, and preheating and baking zones on the baking tube, the baking mechanism can deliver hot air at gradient temperatures to the preheating and baking zones, realizing segmented gradient baking and curing of the enameled wire film. The enameled wire first passes through the low-temperature hot air in the preheating zone to complete the leveling and preliminary shaping of the wet film, and then passes through the high-temperature hot air in the baking zone to achieve deep cross-linking and curing of the film. This effectively avoids the bulging problem caused by the wet film being sealed by instantaneous high temperature and the internal solvent not being able to escape, and also ensures that the cross-linking reaction of the varnish resin is sufficient, significantly improving the adhesion, insulation performance and surface smoothness of the film. At the same time, the inclined air blowing pipes in the baking tube, together with the air blowing head that blows out in the same direction, can form a stable air curtain to wrap around the enameled wire, quickly remove the organic solvent waste gas volatilized from the film, and prevent defects such as whitening and pinholes caused by waste gas backflow, further ensuring the quality of baking and curing.

[0028] 2. The wire diameter detection mechanism moves synchronously with the first adaptive guide mechanism. When the enameled wire is threaded through, its own wire diameter can push the guide mechanism to generate displacement, thereby causing the conductive ring of the wire diameter detection mechanism to slide along the resistance rod. This changes the effective resistance value of the resistance rod connected to the circuit and converts it into an electrical signal, which is transmitted to the PLC controller. The PLC controller adaptively adjusts the output power of the first and second heaters according to the change in the electrical signal, achieving precise matching and adjustment between the wire diameter and the preheating and baking temperatures. The larger the wire diameter, the higher the baking temperature, and the smaller the wire diameter, the lower the baking temperature. This can adapt to the production needs of enameled wires of different specifications, effectively improving production efficiency and product qualification rate.

[0029] 3. Through the set paint collection mechanism, the preheating zone of the baking tube adopts an inclined structure design. When the painting process is abnormal, such as excessive painting or excessively thin paint, causing paint to drip, the inclined surface of the preheating zone can guide the dripping paint to the collection hopper below. The weighing sensor between the collection hopper and the collection box can monitor the weight change of the collection hopper in real time and transmit the data to the PLC controller. Once a sudden change in weight is detected, it can determine that the paint dripping is abnormal and trigger an alarm, promptly reminding the staff to check and adjust the painting process parameters, avoiding paint film defects, equipment contamination or product scrap caused by dripping paint, effectively reducing production losses and improving the stability of the baking and curing process. Attached Figure Description

[0030] Figure 1 This is a first-view perspective perspective of an enameled wire coating baking and curing device provided by the present invention;

[0031] Figure 2 This is a second-view perspective perspective of an enameled wire coating baking and curing device provided by the present invention;

[0032] Figure 3 This is a three-dimensional view of the interior of the baking chamber in an enameled wire coating baking and curing device provided by the present invention;

[0033] Figure 4 This is a perspective view of the first adaptive guiding mechanism and the wire diameter detection mechanism in an enameled wire coating baking and curing device provided by the present invention;

[0034] Figure 5 This is a perspective view of the baking mechanism in an enameled wire coating baking and curing device provided by the present invention;

[0035] Figure 6 This is a perspective view of the blower pipe, blower head, and strip-shaped blower nozzle in an enameled wire coating baking and curing device provided by the present invention;

[0036] Figure 7 This is a perspective view of the paint liquid collection mechanism in an enameled wire paint film baking and curing device provided by the present invention.

[0037] In the diagram: 1 Baking oven, 2 Oven door, 3 Cable inlet, 4 Cable outlet, 5 First adaptive guide mechanism, 51 Housing, 52 Slide plate, 53 Spring, 54 Connecting rod, 55 U-shaped plate, 56 Guide roller, 6 Second adaptive guide mechanism, 7 Baking tube, 8 Support plate, 9 Baking mechanism, 91 Fan, 92 First air supply pipe, 93 Second air supply pipe, 94 First heater, 95 Second heater, 96 First air volume regulating valve, 97 Second air volume regulating valve, 98 Preheating zone, 99 Baking zone, 910 Annular heat insulation plate, 911 Air blowing pipe, 912 Air blowing head, 913 Strip air blowing nozzle, 10 Wire diameter detection mechanism, 101 Cover, 102 Resistance rod, 103 Conductive ring, 104 Insulating connecting block, 11 Paint liquid collection mechanism, 111 Collection box, 112 Collection hopper, 113 Weighing sensor, 12 PLC controller. Detailed Implementation

[0038] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0039] like Figures 1-7As shown, a baking and curing device for enameled wire includes a baking oven 1 and a door 2 disposed on the side wall of the baking oven 1. The door 2 is hinged to the baking oven 1, and the door 2 is provided with a lock head that locks into the baking oven 1. One side of the baking oven 1 is provided with a wire inlet 3, and the other side of the baking oven 1 is provided with a wire outlet 4. The device also includes:

[0040] The first adaptive guide mechanism 5 is disposed on the side wall of the baking oven 1, and the first adaptive guide mechanism 5 is located on the upper and lower sides of the wire inlet 3. The first adaptive guide mechanism 5 includes a housing 51 fixedly disposed on the side wall of the baking oven 1, and the two housings 51 are respectively located on the upper and lower sides of the wire inlet 3. A sliding plate 52 is vertically slidably disposed inside the housing 51. A spring 53 is fixedly disposed between the upper surface of the sliding plate 52 and the top inner wall of the housing 51. A connecting rod 54 extending to the lower part of the housing 51 is fixedly disposed on the lower surface of the sliding plate 52. A U-shaped plate 55 is fixedly disposed at the lower end of the connecting rod 54. A guide roller 56 is rotatably disposed inside the U-shaped plate 55. When the guide roller 56 is squeezed by the enameled wire, the connecting rod 54 drives the sliding plate 52 to slide inside the housing 51 and synchronously compress the spring 53, so that the guide roller 56 can closely fit the outer wall of the enameled wire of different diameters.

[0041] The second adaptive guide mechanism 6 is disposed on the side wall of the baking oven 1, and the second adaptive guide mechanism 6 is located on the upper and lower sides of the outlet 4. The structure of the first adaptive guide mechanism 5 is the same as that of the second adaptive guide mechanism 6.

[0042] Baking tube 7 is located horizontally inside baking oven 1, and support plates 8 are fixedly connected to the top and bottom of baking oven 1 at both the top and bottom of baking tube 7. Baking tube 7 has a hollow structure, with a preheating zone 98 on one side and a baking zone 99 on the other side. An annular heat insulation plate 910 is fixedly installed inside baking tube 7 to separate the preheating zone 98 and the baking zone 99. The annular heat insulation plate 910 can prevent heat conduction between the preheating zone 98 and the baking zone 99. The preheating zone 98 has an inclined structure. Multiple evenly distributed air blowing pipes 911 are fixedly installed on the inclined inner wall of baking tube 7. Air blowing heads 912 are fixedly installed at the ends of multiple air blowing pipes 911 away from the inner wall of baking tube 7. Air blowing heads 912 are hexagonal air tubes. A strip-shaped air blowing nozzle 913 is opened on the side of air blowing head 912 away from air blowing pipe 911. The strip-shaped air blowing nozzle 913 can increase the air blowing area and improve the quality of air blowing preheating and baking of enameled wire.

[0043] Baking mechanism 9 is located on the top of baking box 1, and the output end of baking mechanism 9 is connected to baking tube 7. Baking mechanism 9 includes a fan 91 fixedly installed on the top of baking box 1. The output end of fan 91 is respectively fixedly provided with a first air supply pipe 92 and a second air supply pipe 93 extending to both sides. The pipe walls of the first air supply pipe 92 and the second air supply pipe 93 are respectively fixedly provided with a first heater 94 and a second heater 95. The first heater 94 and the second heater 95 are both tubular electric heaters. The pipe walls of the first air supply pipe 92 and the second air supply pipe 93 are respectively fixedly provided with a first air volume regulating valve 96 and a second air volume regulating valve 97. The ends of the first air supply pipe 92 and the second air supply pipe 93 away from fan 91 are respectively fixedly connected to both sides of baking tube 7.

[0044] A wire diameter detection mechanism 10 is disposed on one side of the first adaptive guide mechanism 5, and moves synchronously with the first adaptive guide mechanism 5. It is used to detect the diameter of the enameled wire. The baking mechanism 9 adaptively adjusts the baking temperature according to the wire diameter value detected by the wire diameter detection mechanism 10. The wire diameter detection mechanism 10 includes a cover 101 fixedly disposed on the side wall of the housing 51. A resistance rod 102 is vertically fixed inside the cover 101. A conductive ring 103 is slidably disposed on the rod wall of the resistance rod 102. An insulating connecting block 104 is fixedly disposed on the outer wall of the conductive ring 103. One side of the insulating connecting block 104 is fixedly connected to one side of the slide plate 52. When the slide plate 52 moves, it will synchronously drive the insulating connecting block 104 to move in the vertical direction. The conductive ring 103 on the insulating connecting block 104 slides along the length direction of the resistance rod 102, thereby changing the effective length of the resistance rod 102 connected in the circuit, so that the resistance value of the resistance rod 102 connected in the circuit changes continuously.

[0045] The paint collection mechanism 11 is located inside the baking oven 1 and below one side of the baking tube 7. The paint collection mechanism 11 includes a collection box 111 fixedly installed on the inner wall of the bottom of the baking oven 1. The collection box 111 has a collection hopper 112 inside. A weighing sensor 113 is fixedly installed between the bottom of the collection hopper 112 and the inner wall of the bottom of the collection box 111. The collection hopper 112 can collect the paint flowing down from the preheating zone 98 of the baking tube 7. The weighing sensor 113 weighs the collection hopper 112 and the paint inside it to determine whether the painting process is abnormal.

[0046] The PLC controller 12 is fixedly installed on the side wall of the baking oven 1. The baking mechanism 9, the wire diameter detection mechanism 10, and the paint collection mechanism 11 are all electrically connected to the PLC controller 12.

[0047] The operating principle of the present invention is described as follows: The operator first manually opens the door 2 of the baking oven 1 and inserts the end of the enameled wire that has completed the coating process into the baking oven 1 through the wire inlet 3. During the insertion process, the enameled wire passes through the preheating zone 98 and the baking zone 99 inside the baking tube 7 in sequence, and finally extends outward from the wire outlet 4. After the end of the enameled wire extends out of the baking oven 1, it is fixedly connected to the external winding device. In view of the problem that there is a section of enameled wire that has not been baked and cured between the baking oven 1 and the winding device at the initial stage of the winding device, the operator uses a mobile heating device to bake this section. Finally, the operator closes the door 2 and prepares to start the baking and curing process.

[0048] The operator issues a start command via PLC controller 12, simultaneously starting fan 91, first heater 94, and second heater 95. First heater 94 is set to preheating mode, with operating power adapted to the preheating temperature range, and its heating temperature controlled between 80-150℃, used for the initial shaping of the wet paint film. Second heater 95 is set to baking and curing mode, with operating power higher than first heater 94, and its heating temperature controlled between 200-420℃, used for deep cross-linking and curing of the paint film. After fan 91 starts, it blows outside air into first air supply pipe 92 and second air supply pipe 93 respectively. The airflow in first air supply pipe 92 and second air supply pipe 93 interacts with the heat generated by first heater 94 and second heater 95 respectively. Heat exchange is performed, and the two streams of hot air are then delivered to the air blowers 911 corresponding to the preheating zone 98 and baking zone 99 of the baking tube 7, respectively. The air is then blown directionally onto the surface of the enameled wire through the blower head 912. Since each blower 911 is arranged at an angle and the air outlet direction of the blower head 912 is consistent with the traction direction of the enameled wire, this structural design can use the forward airflow to form a stable air curtain to wrap the enameled wire. On the one hand, it can effectively avoid the impact, swaying or scratching of the unformed wet paint film caused by the reverse airflow, ensuring the flatness of the paint film surface. On the other hand, the forward airflow can quickly carry the organic solvent waste gas volatilized from the paint film out of the baking zone 99 along the traction direction, preventing the waste gas from flowing back and causing defects such as whitening and pinholes in the paint film, while improving the uniformity of heat transfer.

[0049] The enameled wire undergoes preheating and baking curing processes sequentially within the baking chamber 1. First, the wet enamel film is leveled and initially shaped by the medium-low temperature hot air in the preheating zone 98. Then, it enters the baking zone 99 to undergo deep curing by high temperature hot air. This segmented gradient baking process effectively avoids the problem of bulging caused by the wet enamel film being unable to escape due to instantaneous high temperature, which prevents the surface sealant and internal solvent from escaping. At the same time, it ensures that the cross-linking reaction of the enamel resin is sufficient, significantly improving the adhesion and insulation performance of the enamel film. After the cured enameled wire extends out of the baking chamber 1, it is wound up at a uniform speed by the winding device.

[0050] During the threading and pulling process of the enameled wire, its outer wall always maintains rolling contact with the guide rollers 56 distributed on the upper and lower sides of the inlet 3 and outlet 4. The roller wall of the guide roller 56 is designed with a concave arc structure, which can form a close surface contact with the cylindrical outer wall of the enameled wire. For enameled wires of different diameters, the upper and lower sets of guide rollers 56 can adaptively change relative displacement according to the wire diameter.

[0051] When the enameled wire is inserted, the guide roller 56 is subjected to radial extrusion force, which drives the slide plate 52 to slide inside the housing 51 through the connecting rod 54 and simultaneously compresses the spring 53, so that the guide roller 56 can closely fit the outer wall of the enameled wire of different diameters, always providing a stable clamping and guiding force for the enameled wire, effectively limiting the swing and deviation of the enameled wire during the traction process, and ensuring that the enameled wire smoothly passes through the various process areas inside the baking oven 1 along the preset trajectory.

[0052] When the enameled wire passes between the upper and lower guide rollers 56, the two sets of guide rollers 56 are relatively displaced under the support of the wire diameter, which in turn pushes the slide plate 52 to move vertically. During the movement of the slide plate 52, the insulating connecting block 104 moves vertically along with it. The conductive ring 103 on the insulating connecting block 104 slides along the length of the resistor rod 102, thereby changing the effective length of the resistor rod 102 connected in the circuit, so that the resistance value of the resistor rod 102 connected in the circuit changes continuously. A measuring circuit is connected between the resistor rod 102 and the conductive ring 103. The measuring circuit can detect the current change in the circuit in real time and convert the current signal into a corresponding electrical signal output. After amplification, filtering and other conditioning processing, the electrical signal is transmitted to the PLC controller 12. The PLC controller 12 adjusts the output power of the first heater 94 and the second heater 95 according to the received electrical signal change, thereby achieving the purpose of automatically matching and adjusting the preheating temperature and baking temperature according to the enameled wire of different diameters.

[0053] The specific adjustment process is as follows: When the diameter of the enameled wire is larger, the distance between the enameled wire and the upper and lower guide rollers 56 is larger, the moving distance of the slide plate 52 is increased accordingly, and the sliding distance of the conductive ring 103 on the resistor rod 102 is also increased, so that the effective resistance of the resistor rod 102 connected to the circuit gradually decreases. According to Ohm's law, in the same circuit with a constant supply voltage, the smaller the resistance, the larger the circuit current. According to the increasing trend of the current signal, the PLC controller 12 increases the output power of the first heater 94 and the second heater 95, so that the temperature of the preheating zone 98 and the baking zone 99 increases accordingly. At the same time, the PLC controller 12 increases the opening of the first air volume regulating valve 96 and the second air volume regulating valve 97 to increase the hot air volume entering the preheating zone 98 and the baking zone 99, adapting to the larger heat capacity requirements of the thicker diameter enameled wire, and ensuring sufficient and uniform heat transfer.

[0054] Conversely, when the diameter of the enameled wire is smaller, the spreading distance of the guide roller 56 is smaller, the moving distance of the slide plate 52 is smaller, the effective resistance of the resistor rod 102 connected to the circuit gradually increases, and the circuit current decreases accordingly. According to the decreasing trend of the current signal, the PLC controller 12 reduces the output power of the first heater 94 and the second heater 95, so that the temperature of the preheating zone 98 and the baking zone 99 decreases accordingly. At the same time, the PLC controller 12 reduces the opening of the first air volume regulating valve 96 and the second air volume regulating valve 97 to reduce the amount of hot air entering the preheating zone 98 and the baking zone 99, so as to avoid the problem of over-curing, brittleness and cracking of the enamel film caused by excessive hot air flow and heat in the fine-diameter enameled wire, and ensure the curing quality of the enamel film.

[0055] The above control can achieve adaptive and precise adjustment of preheating temperature and baking temperature according to the diameter of the enameled wire, ensuring that enameled wires of different specifications can be cured under matching temperature conditions, effectively improving the curing quality of the coating film and the versatility of production.

[0056] During the baking and curing process, if abnormalities such as excessive coating or low viscosity of the paint occur in the front-end coating process of the enameled wire, the paint on the surface of the wet paint film is prone to dripping under the action of gravity. When the enameled wire passes through the preheating zone 98 inside the baking tube 7, the dripping paint will fall directly into the interior of the preheating zone 98. Since the preheating zone 98 is arranged at an incline, the paint can flow downward along the incline under its own gravity and automatically collect into the collection hopper 112 below. A weighing sensor 113 is installed between the collection hopper 112 and the collection box 111. The detection end of the weighing sensor 113 is connected to the collection hopper 112, which can continuously weigh and monitor the collection hopper 112 and the paint collected inside in real time, and record the real-time weight. The data is transmitted to the PLC controller 12. Once paint drips into the collection hopper 112, the overall weight of the collection hopper 112 will increase, and the weight data detected by the weighing sensor 113 will change abruptly. After receiving the weight data change signal, the PLC controller 12 determines that there is an abnormality in the paint dripping by comparing the difference between the real-time weight and the reference weight. At this time, the PLC controller 12 immediately outputs an alarm signal to trigger the corresponding alarm action, which promptly reminds the staff that there is an abnormality in the painting process. This allows the staff to quickly adjust parameters such as the amount of paint and the viscosity of the paint, avoiding paint film defects, equipment contamination or product scrap caused by paint, and improving the stability of the production process.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A baking and curing device for enameled wire film, comprising a baking oven (1) and a door (2) disposed on the side wall of the baking oven (1), wherein the baking oven (1) has a wire inlet (3) on one side and a wire outlet (4) on the other side, characterized in that, Also includes: The first adaptive guide mechanism (5) is disposed on the side wall of the baking oven (1), and the first adaptive guide mechanism (5) is located on the upper and lower sides of the inlet (3); The second adaptive guide mechanism (6) is disposed on the side wall of the baking oven (1), and the second adaptive guide mechanism (6) is located on the upper and lower sides of the outlet (4); The baking tube (7) is located horizontally inside the baking box (1), and the top and bottom of the baking tube (7) are fixedly provided with support plates (8) that are fixedly connected to the top and bottom of the baking box (1). Baking mechanism (9) is located on top of the baking box (1), and the output end of baking mechanism (9) is connected to the baking tube (7); The wire diameter detection mechanism (10) is located on one side of the first adaptive guide mechanism (5), and the wire diameter detection mechanism (10) moves synchronously with the first adaptive guide mechanism (5) to detect the diameter of the enameled wire. The baking mechanism (9) adaptively adjusts the baking temperature according to the wire diameter value detected by the wire diameter detection mechanism (10). The paint collection mechanism (11) is located inside the baking oven (1) and is located below one side of the baking tube (7); The PLC controller (12) is fixedly installed on the side wall of the baking oven (1). The baking mechanism (9), the wire diameter detection mechanism (10) and the paint collection mechanism (11) are all electrically connected to the PLC controller (12).

2. The enameled wire coating baking and curing apparatus according to claim 1, characterized in that, The first adaptive guiding mechanism (5) includes a housing (51) fixedly mounted on the side wall of the baking oven (1), and two housings (51) are located on the upper and lower sides of the inlet (3) respectively. A sliding plate (52) is vertically slidably mounted inside the housing (51). A spring (53) is fixedly mounted between the upper surface of the sliding plate (52) and the top inner wall of the housing (51). A connecting rod (54) extending to the bottom of the housing (51) is fixedly mounted on the lower surface of the sliding plate (52). A U-shaped plate (55) is fixedly mounted at the lower end of the connecting rod (54). A guide roller (56) is rotatably mounted inside the U-shaped plate (55). The structure of the first adaptive guiding mechanism (5) is the same as that of the second adaptive guiding mechanism (6).

3. The enameled wire coating baking and curing apparatus according to claim 2, characterized in that, The baking mechanism (9) includes a fan (91) fixedly installed on the top of the baking box (1). The output end of the fan (91) is respectively provided with a first air supply pipe (92) and a second air supply pipe (93) extending to both sides. The pipe walls of the first air supply pipe (92) and the second air supply pipe (93) are respectively provided with a first heater (94) and a second heater (95). The pipe walls of the first air supply pipe (92) and the second air supply pipe (93) are respectively provided with a first air volume regulating valve (96) and a second air volume regulating valve (97). The ends of the first air supply pipe (92) and the second air supply pipe (93) away from the fan (91) are respectively fixedly connected to both sides of the baking tube (7).

4. The enameled wire coating baking and curing apparatus according to claim 3, characterized in that, The baking tube (7) has a hollow structure. One side of the baking tube (7) is a preheating zone (98), and the other side of the baking tube (7) is a baking zone (99). An annular heat insulation plate (910) is fixedly provided inside the baking tube (7) to separate the preheating zone (98) and the baking zone (99). The preheating zone (98) has an inclined structure. Multiple evenly distributed blowers (911) are fixedly provided on the inner wall of the baking tube (7). Each of the multiple blowers (911) has a blower head (912) fixedly provided at the end away from the inner wall of the baking tube (7).

5. The enameled wire coating baking and curing apparatus according to claim 4, characterized in that, The blower head (912) is a hexagonal air duct, and a strip-shaped air outlet (913) is provided on the side of the blower head (912) away from the blower tube (911).

6. The enameled wire coating baking and curing apparatus according to claim 5, characterized in that, The wire diameter detection mechanism (10) includes a cover (101) fixedly installed on the side wall of the housing (51). A resistance rod (102) is vertically fixed inside the cover (101). A conductive ring (103) is slidably installed on the rod wall of the resistance rod (102). An insulating connecting block (104) is fixedly installed on the outer wall of the conductive ring (103), and one side of the insulating connecting block (104) is fixedly connected to one side of the sliding plate (52).

7. The enameled wire coating baking and curing apparatus according to claim 6, characterized in that, The paint collection mechanism (11) includes a collection box (111) fixedly installed on the bottom inner wall of the baking oven (1). The collection box (111) has a collection hopper (112) inside. A weighing sensor (113) is fixedly installed between the bottom of the collection hopper (112) and the bottom inner wall of the collection box (111).

8. A method of using the enameled wire coating baking and curing apparatus as described in claim 7, characterized in that, The method includes the following steps: S1: Threading preparation. The staff manually opens the door (2) of the baking box (1) and inserts the end of the enameled wire that has completed the coating process into the baking box (1) through the inlet (3). The wire passes through the guide roller (56) of the first adaptive guide mechanism (5), the preheating zone (98) and baking zone (99) of the baking tube (7), and the guide roller (56) of the second adaptive guide mechanism (6) in sequence. The wire then extends outward from the outlet (4). The end of the enameled wire extending out of the baking box (1) is then fixedly connected to the external winding device. After the process is completed, the door (2) is closed. S2: The equipment is started. The staff sends a start command through the PLC controller (12) to start the fan (91), the first heater (94) and the second heater (95) of the baking mechanism (9) in sync. The staff adjusts the opening of the first air volume regulating valve (96) and the second air volume regulating valve (97) according to the process requirements. The preheating temperature of the first heater (94) is set to 80-150℃ and the baking temperature of the second heater (95) is set to 200-420℃. S3: Gradient baking, the blower (91) blows outside air into the first air supply pipe (92) and the second air supply pipe (93). After the airflow exchanges heat with the first heater (94) and the second heater (95), it forms gradient hot air. It is blown towards the surface of the enameled wire through the blower pipe (911) and blower head (912) in the baking pipe (7). The enameled wire first passes through the preheating zone (98) to complete the wet paint film leveling and preliminary shaping, and then passes through the baking zone (99) to complete the deep cross-linking and curing of the paint film. The cured enameled wire is wound up at a uniform speed by the winding device. S4: Adaptive temperature control of wire diameter. During the threading and traction of the enameled wire, the upper and lower guide rollers (56) are pushed to generate relative displacement, which drives the connecting rod (54) and the slide plate (52) to slide in the housing (51). Simultaneously, the insulating connecting block (104) and the conductive ring (103) are pulled to slide along the resistance rod (102), changing the effective resistance value of the resistance rod (102) connected to the circuit. The PLC controller (12) adaptively adjusts the output power of the first heater (94) and the second heater (95) according to the change of electrical signal. S5: Paint monitoring and alarm. During the baking and curing process, if an abnormality occurs in the painting process and causes paint to drip, the inclined structure of the preheating zone (98) will guide the paint to the collection hopper (112) of the paint collection mechanism (11). The weighing sensor (113) will detect the weight change of the collection hopper (112) in real time and transmit the data to the PLC controller (12). The PLC controller (12) will immediately trigger an alarm action to remind the staff to check and adjust the painting process parameters.

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