A kind of anti-film aging enameled wire coating process and coating device

Abstract

The application discloses an anti-aging paint film enameled wire coating process and a coating device. The coating process comprises the following steps: coating an insulating paint layer on the surface of a copper wire, then performing first baking on the insulating paint layer on the surface of the copper wire, if the insulating paint layer is completely solidified after the first baking, then performing cooling on the insulating paint layer on the surface of the copper wire, if the insulating paint layer is not completely solidified after the first baking, then performing second baking on the insulating paint layer on the surface of the copper wire, so that the insulating paint layer is completely solidified, then performing cooling on the insulating paint layer, and finally repeating the above steps of coating multiple insulating paint layers on the surface of the copper wire to obtain a finished enameled wire. The application can avoid aging and damage of a paint film on the surface of an enameled wire in a preparation process.

Description

Technical Field

[0001] This invention relates to a coating process for enameled wire, and more particularly to a coating process and apparatus for enameled wire that resists enamel film aging. Background Technology

[0002] Enameling machines mainly consist of a wire feeding mechanism, a coating mechanism, and an enameling furnace. During operation, the wire feeding mechanism controls multiple enameled wires to simultaneously pass through the coating mechanism and the enameling furnace. The coating mechanism then applies an insulating varnish layer to the surface of each wire as it passes through, and the enameling furnace individually bakes this insulating varnish layer to ensure complete curing. This process is repeated multiple times, causing the multiple insulating varnish layers on the surface of the enameled wire to combine and form an insulating varnish film. Building upon this, to achieve simultaneous production of enameled wires of different specifications, manufacturers now optimize the coating mechanism of the enameling machine, enabling it to coat the surface of the enameled wire with two different insulating varnishes. This allows users to select the type of insulating varnish and the number of coating layers required for each enameled wire, thus achieving simultaneous production of enameled wires of different specifications.

[0003] However, the above method faces a problem in actual production: as the type or thickness of the enamel film changes, the baking effect of the enameling furnace on different insulating enamel layers under the same operating conditions will also vary. This leads to problems such as incomplete curing or excessive aging of some insulating enamel layers when using the same baking parameters to bake the insulating enamel layers of different specifications of enameled wire. To address these shortcomings, manufacturers currently offer two solutions. The first is to divide the traditional integrated enameling furnace into multiple independent furnace chambers, each corresponding to a different specification of enameled wire and with individual temperature control, so that different insulating enamel layers can achieve the required baking effect within the same baking time. However, this method significantly increases the structural complexity and temperature control difficulty of the hot air circulation mechanism in the enameling furnace, transforming it from a single unit to multiple composite units, resulting in a substantial increase in the overall equipment cost of the enameling machine.

[0004] The second approach involves improving the wire feeding mechanism of the enameling machine. This transforms the original method of multiple enameled wires being fed simultaneously by a single feeding roller into a system where multiple feeding rollers individually feed different enameled wires. By adjusting the speed of each feeding roller, the residence time of each wire within the enameling furnace can be controlled, ensuring that different insulating varnish layers achieve the desired baking effect under the same baking environment. However, this method of splitting the feeding rollers and controlling their individual speeds requires each roller to be connected to a separate drive motor via a transmission mechanism. This increase in the number of transmission mechanisms and drive motors inevitably occupies space in the width direction of the enameling machine, thus increasing the overall width of the enameling furnace. The increased furnace width leads to a significant increase in the overall furnace volume and heating power consumption, resulting in a substantial increase in both initial equipment costs and long-term operating costs.

[0005] Furthermore, the insulating varnish layer on the surface of the enameled wire is at a high temperature after baking. If the wire is directly guided by the wire guide roller at this time, the insulating varnish layer is prone to sticking to the surface of the wire guide roller, damaging the coating effect. However, if a water cooling system is combined with the wire guide roller to cool the enameled wire, the insulating varnish layer is prone to generating large curing internal stress due to the sudden temperature drop when passing through the wire guide roller, increasing the possibility of varnish film deformation and cracking.

[0006] Therefore, existing enameling machines are prone to causing aging and damage to the enamel film on the surface of some enameled wires when processing enameled wires of different specifications. Summary of the Invention

[0007] The purpose of this invention is to provide a coating process and apparatus for enameled wires that resists aging of the enamel film. This process can prevent aging and damage to the enamel film on the surface of the enameled wire during the manufacturing process.

[0008] The technical solution of the present invention: a coating process for enameled wires to resist enamel film aging, comprising the following steps:

[0009] A. Coat the surface of the copper wire with an insulating varnish layer, then proceed to step B;

[0010] B. Perform a first baking on the insulating varnish layer on the surface of the copper wire. If the insulating varnish layer is completely cured after the first baking, proceed to step C. If the insulating varnish layer is not completely cured after the first baking, proceed to step D.

[0011] C. Cool the insulating varnish layer on the surface of the copper wire, and proceed to step E;

[0012] D. First, bake the insulating varnish layer on the surface of the copper wire a second time to completely cure the insulating varnish layer, then cool the insulating varnish layer and proceed to step E;

[0013] E. Repeat steps A-D to coat the surface of the copper wire with multiple layers of insulating varnish to obtain the finished enameled wire.

[0014] In the aforementioned anti-aging enameled wire coating process, a first insulating varnish film and a second insulating varnish film are formed on the surface of the enameled wire in step E. Both the first insulating varnish film and the second insulating varnish film are composed of multiple insulating varnish layers. The insulating varnish layer corresponding to the first insulating varnish film is coated in the order of step A-step B-step C, and the insulating varnish layer corresponding to the second insulating varnish film is coated in the order of step A-step B-step D.

[0015] In the aforementioned anti-aging enameled wire coating process, the enameled wire in step E is either a first enameled wire or a second enameled wire. The first enameled wire is prepared in the order of step A-step B-step C, and the second enameled wire is prepared in the order of step A-step B-step D.

[0016] A coating device is also provided. The aforementioned anti-coating process for enameled wire is processed using this coating device. The coating device includes an enameling frame, on which a coating mechanism, an enameling furnace, and a secondary oven are sequentially arranged along the wire routing direction. The secondary oven includes a box body, inside which a baking chamber and a cooling chamber are sequentially formed along the wire routing direction. A hot air inlet pipe is connected to one side of the baking chamber, and a hot air outlet pipe is connected to the other side of the baking chamber. A wire outlet is formed on one side of the cooling chamber, and a cold air outlet pipe is connected to the other side of the cooling chamber. Both the hot air outlet pipe and the cold air outlet pipe are connected to exhaust pipes, and an air pump is connected to the exhaust pipes.

[0017] The coating mechanism is used to coat the surface of the copper wire with an insulating varnish layer;

[0018] The enameling furnace is used for the first baking of the insulating varnish layer on the surface of the copper wire;

[0019] The baking chamber is used for a second baking of the insulating varnish layer on the surface of the copper wire;

[0020] The cooling chamber is used to cool the insulating varnish layer.

[0021] In the aforementioned coating apparatus, the baking chamber is provided with a first air guide assembly, and a first wiring channel for wiring is formed in the middle of the first air guide assembly; the cooling chamber is provided with a second air guide assembly, and a second wiring channel for wiring is formed in the middle of the second air guide assembly.

[0022] Both the first air guide assembly and the second air guide assembly include multiple sets of guide plates spaced apart in the housing along the wiring direction. Each set of guide plates includes a separate upper guide plate and a lower guide plate, which are symmetrically distributed in a figure-eight shape on the upper and lower sides of the first wiring channel or the second wiring channel.

[0023] In the aforementioned coating device, the upper and lower guide plates of the second air guide assembly are fixedly connected to the housing, and the upper and lower guide plates of the first air guide assembly are connected to the housing via an adjustment assembly.

[0024] The upper and lower guide plates of the first air guide assembly are both connected to a rotating shaft. The two ends of the rotating shaft are rotatably connected to the housing. The adjustment assembly includes a transmission gear fixedly connected to one side of the rotating shaft. The end of the transmission gear extends to the outside of the housing and is connected to a drive rack. A drive rod is connected to the outside of the drive rack. The drive rod is used to adjust the included angle between the upper and lower guide plates by extension and retraction.

[0025] In the aforementioned coating device, each set of adjustment components has one drive rod. The drive rod is fixedly connected to the side wall of the housing. The end of the drive rod is connected to two drive racks via an intermediate rod. The two drive racks are respectively connected to the transmission gear corresponding to the upper guide plate and the transmission gear corresponding to the lower guide plate.

[0026] Alternatively, each set of adjustment components may have two drive rods, which are fixedly connected to the top and bottom of the housing, respectively. Each drive rod has a drive rack at its end, and the two drive racks are respectively connected to the transmission gears corresponding to the upper and lower guide plates.

[0027] In the aforementioned coating device, multiple processing chambers are formed side by side along the width direction of the enameling machine frame inside the box. Each processing chamber is equipped with a baking chamber and a cooling chamber. Adjacent processing chambers are separated from each other by partitions. The hot air inlet pipes of multiple baking chambers are simultaneously connected to hot air main pipes, and the hot air outlet pipes of multiple baking chambers and the cold air outlet pipes of multiple cooling chambers are connected to the same exhaust pipe.

[0028] In the aforementioned coating apparatus, the outer end of the hot air main pipe is connected to the exhaust gas outlet pipe of the enameling furnace, and a temperature sensor and a heating mechanism are respectively connected to the hot air main pipe. Pipe valves are connected to both the hot air inlet pipe and the hot air main pipe.

[0029] In the aforementioned coating apparatus, a bypass valve is connected to one side of the hot air inlet pipe. The bypass valve is used to open when the pipeline valve is closed and allow outside air to enter the baking chamber through the hot air inlet pipe to cool the insulating varnish layer.

[0030] Compared with the prior art, the present invention has the following characteristics:

[0031] (1) By limiting the coating process, the present invention enables the baking process originally required for the insulating varnish layer to be split into a first baking and a second baking. The first baking process is completed by the enameling furnace alone, and the second baking process is completed by an independent secondary oven alone, thereby using two baking processes to completely cure the insulating varnish layer.

[0032] With the above-mentioned combination, the present invention can use a second baking process to re-bake the insulating varnish layer based on the curing state of different insulating varnish layers after the first baking, thereby achieving simultaneous processing of enameled wires of different specifications while ensuring the curing effect of the insulating varnish layer, and without the need to separately adjust the wire speed and furnace temperature of the enameled furnace during the processing.

[0033] (2) Based on the above, the present invention can achieve stable processing of enameled wires of various specifications using a single enameling machine. For example, when a first insulating varnish film and a second insulating varnish film of different insulating varnish materials are formed on the surface of the enameled wire, or when the insulating varnish materials on the surfaces of different enameled wires are different, one insulating varnish film can be baked separately in an enameling furnace, while another insulating varnish film is re-baked in a secondary oven. Thus, the two insulating varnish films can achieve the best curing effect at the same time through the changes in the baking process.

[0034] (3) By limiting the structure of the coating device, each enameled wire can pass through the secondary oven together after exiting the enameling furnace. The secondary oven will then perform differentiated treatment on each enameled wire according to the requirements. That is, some enameled wires will be cooled by air through the baking chamber and cooling chamber at the same time after entering the oven. Other enameled wires will be heated by hot air in the baking chamber to completely cure the insulating varnish layer. Then, the insulating varnish layer will be cooled by air through the cooling chamber to avoid adhesion and damage to the insulating varnish layer during subsequent wiring.

[0035] (4) By defining the structure of the first air guide assembly and the second air guide assembly, the airflow can form an S-shaped airflow path under the guidance of the upper and lower guide plates when it flows in the baking chamber and the cooling chamber. During the flow, the enameled wire is swept at a specified angle, thereby extending the heat exchange time between the airflow and the enameled wire and improving the baking and cooling effect. On the other hand, the airflow can also destroy the air boundary layer on the surface of the varnish film under the inclined sweeping action, so that the insulating varnish layer can come into contact with more airflow, that is, further improving the baking and cooling effect of the airflow on the insulating varnish layer.

[0036] (5) By limiting the structure of the adjustment component, the tilt angle of the baffle plate group in the baking chamber can be adjusted according to the baking effect of the insulating varnish layer. Thus, without changing the wire speed and hot air temperature, the baking effect can be adjusted to adapt to different specifications of insulating varnish layers, so that each wire can achieve the required curing effect after two baking processes.

[0037] Therefore, the present invention can avoid aging and damage to the enamel film on the surface of enameled wire during the preparation process. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the structure of Example 3;

[0039] Figure 2 This is a side view of the secondary drying oven in Example 3;

[0040] Figure 3 This is a cross-sectional view of the secondary drying oven in Example 3;

[0041] Figure 4 yes Figure 2 View from direction A;

[0042] Figure 5 This is a side view of the secondary drying oven in Example 4.

[0043] The labels in the attached diagram are as follows: 100-Enameling frame, 200-Painting mechanism, 300-Enameling furnace, 400-Secondary drying oven, 1-Box body, 2-Baking chamber, 3-Cooling chamber, 4-Hot air inlet pipe, 5-Hot air outlet pipe, 6-Outlet port, 7-Cold air outlet pipe, 8-Exhaust pipe, 9-Upper guide plate, 10-Lower guide plate, 11-Rotating shaft, 12-Transmission gear, 13-Drive rack, 14-Drive rod, 15-Baffle plate, 16-Temperature sensor, 17-Heating mechanism, 18-Pipe valve, 19-Bypass valve, 20-Hot air main pipe. Detailed Implementation

[0044] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0045] Example 1. A coating process for enameled wires to resist enamel film aging, comprising the following steps:

[0046] A. Apply an insulating varnish layer to the surface of the copper wire using the coating mechanism of the enameling machine, then proceed to step B;

[0047] B. The insulating varnish layer on the surface of the copper wire is baked for the first time in an enameling furnace. If the insulating varnish layer is completely cured after the first baking, proceed to step C. If the insulating varnish layer is not completely cured after the first baking, proceed to step D.

[0048] C. Cool the insulating varnish layer on the surface of the copper wire using a secondary drying oven, and proceed to step E;

[0049] D. The insulating varnish layer on the surface of the copper wire is first baked a second time in a secondary oven to completely cure the insulating varnish layer, and then the insulating varnish layer is cooled before proceeding to step E;

[0050] E. Repeat steps A-D to coat the surface of the copper wire with multiple layers of insulating varnish to obtain the finished enameled wire.

[0051] In step E, a first insulating varnish film and a second insulating varnish film are formed on the surface of the enameled wire. Both the first and second insulating varnish films are composed of multiple layers of insulating varnish. The first and second insulating varnish films are coated with insulating varnishes of two different materials. The insulating varnish layer corresponding to the first insulating varnish film is coated in the order of step A-step B-step C, and the insulating varnish layer corresponding to the second insulating varnish film is coated in the order of step A-step B-step D.

[0052] This embodiment separates the baking process of the insulating varnish layer into a first baking and a second baking, allowing the enameling oven to bake the insulating varnish layers corresponding to the first and second insulating varnish films using the same process parameters. The insulating varnish layer corresponding to the first insulating varnish film is fully cured after the first baking and proceeds directly to the next coating process after cooling; while the insulating varnish layer corresponding to the second insulating varnish film is in an incompletely cured state after the first baking, and is subjected to a second baking in the secondary oven to fully cure the insulating varnish layer.

[0053] Based on the above, the enameling machine is able to process different materials of enamel film on the surface of enameled wire in sequence, and ensure that both types of insulating enamel film achieve the required baking effect after processing.

[0054] Example 2. A coating process for enameled wires to resist enamel film aging, comprising the following steps:

[0055] A. Apply an insulating varnish layer to the surface of the copper wire using the coating mechanism of the enameling machine, then proceed to step B;

[0056] B. The insulating varnish layer on the surface of the copper wire is baked for the first time in an enameling furnace. If the insulating varnish layer is completely cured after the first baking, proceed to step C. If the insulating varnish layer is not completely cured after the first baking, proceed to step D.

[0057] C. Cool the insulating varnish layer on the surface of the copper wire using a secondary drying oven, and proceed to step E;

[0058] D. The insulating varnish layer on the surface of the copper wire is first baked a second time in a secondary oven to completely cure the insulating varnish layer, and then the insulating varnish layer is cooled before proceeding to step E;

[0059] E. Repeat steps A-D to coat the surface of the copper wire with multiple layers of insulating varnish to obtain the finished enameled wire.

[0060] The enameled wire in step E is either the first enameled wire or the second enameled wire. The insulating varnish material or the thickness of the insulating varnish layer on the surface of the first enameled wire or the second enameled wire are different. The first enameled wire is prepared in the order of step A-step B-step C, and the second enameled wire is prepared in the order of step A-step B-step D.

[0061] Compared to Example 1, this example uses the same enameling machine to simultaneously process two different specifications of enameled wires, and adjusts the preparation process for the insulation varnish layer of each wire. This allows the insulation varnish layer of one type of enameled wire to be directly cured with just the first baking, while the insulation varnish layer of the other type of enameled wire is cured through a combination of the first and second baking processes. This ensures that both types of enameled wires achieve the desired coating effect during processing.

[0062] Example 3. Coating apparatus, configured as follows Figure 1-4 As shown, the coating processes in Examples 1 and 2 are both performed using this coating device. This device includes an enameling frame 100, on which a coating mechanism 200, an enameling furnace 300, and a secondary oven 400 are sequentially arranged along the wire routing direction. The secondary oven 400 includes a chamber 1, inside which a baking chamber 2 and a cooling chamber 3 are sequentially formed along the wire routing direction. Only a circular opening for the enameled wire to pass through is left at the front end of the baking chamber 2 and between the baking chamber 2 and the cooling chamber 3. The inner walls of the baking chamber 2 and the cooling chamber 3 are covered with a heat insulation layer. A hot air inlet pipe 4 is connected to one side of the baking chamber 2, and a hot air outlet pipe 5 is connected to the other side of the baking chamber 2. An outlet port 6 is formed on one side of the cooling chamber 3, and a cold air outlet pipe 7 is connected to the other side of the cooling chamber 3. The ends of the hot air inlet pipe 4, the hot air outlet pipe 5 and the cold air outlet pipe 7 are connected to the box body 1 through a square-round reducing pipe. The ends of the hot air outlet pipe 5 and the cold air outlet pipe 7 are both connected to an exhaust pipe 8, and an air pump is connected to the exhaust pipe 8.

[0063] The coating mechanism 200 is used to coat the surface of the copper wire with an insulating varnish layer;

[0064] The enameling furnace 300 is used for the first baking of the insulating varnish layer on the surface of the copper wire;

[0065] The baking chamber 2 is used to perform a second baking of the insulating varnish layer on the surface of the copper wire;

[0066] The cooling chamber 3 is used to cool the insulating varnish layer.

[0067] The painting mechanism 200 and the enameling furnace 300 are both conventional painting mechanisms 200 and enameling furnaces 300 used in enameling machines. The enameling furnace 300 is equipped with a hot air circulation mechanism for controlling the furnace temperature, and the hot air circulation mechanism is equipped with an exhaust pipe for exhausting gas.

[0068] The baking chamber 2 is equipped with a first air guide assembly, and a first wiring channel for wiring is formed in the middle of the first air guide assembly; the cooling chamber 3 is equipped with a second air guide assembly, and a second wiring channel for wiring is formed in the middle of the second air guide assembly.

[0069] Both the first air guide assembly and the second air guide assembly include multiple sets of guide plates distributed at intervals in the housing 1 along the wiring direction. Each set of guide plates includes a split upper guide plate 9 and a lower guide plate 10. The upper guide plate 9 and the lower guide plate 10 are symmetrically distributed in a figure-eight shape on the upper and lower sides of the first wiring channel or the second wiring channel.

[0070] The upper guide plate 9 and the lower guide plate 10 of the second air guide assembly are fixedly connected to the housing 1, and the upper guide plate 9 and the lower guide plate 10 of the first air guide assembly are connected to the housing 1 via an adjustment assembly;

[0071] The upper guide plate 9 and the lower guide plate 10 of the first air guide assembly are both connected to a rotating shaft 11. The two ends of the rotating shaft 11 are rotatably connected to the housing 1. The adjustment assembly includes a transmission gear 12 fixedly connected to one side of the rotating shaft 11. The end of the transmission gear 12 extends to the outside of the housing 1 and is connected to a drive rack 13. The same drive rack 13 is simultaneously connected to the transmission gears 12 of multiple upper guide plates 9 or lower guide plates 10. The drive rack 13 is slidably connected to the outer wall of the housing 1. The drive rack 13 is connected to a drive rod 14. The drive rod 14 can be an electric push rod. The drive rod 14 is used to adjust the included angle between the upper guide plate 9 and the lower guide plate 10 by extension and retraction, thereby controlling the baking effect of the insulating varnish layer.

[0072] Each set of adjustment components has one drive rod 14, which is fixedly connected to the side wall of the housing 1. The end of the drive rod 14 is connected to two drive racks 13 through the middle rod. The two drive racks 13 are respectively connected to the transmission gear 12 corresponding to the upper guide plate 9 and the transmission gear 12 corresponding to the lower guide plate 10.

[0073] The housing 1 contains two parallel processing chambers along the width of the enameling machine frame 100. Each processing chamber is equipped with a baking chamber 2 and a cooling chamber 3. Adjacent processing chambers are separated by a partition 15. The hot air inlet pipes 4 of the two baking chambers 2 are connected to the same hot air main pipe 20. The hot air outlet pipes 5 of the two baking chambers 2 and the cold air outlet pipes 7 of the two cooling chambers 3 are connected to the same exhaust pipe 8. The first air guide assembly and the second air guide assembly are in two sets and are respectively installed in each baking chamber 2 and cooling chamber 3.

[0074] The outer end of the hot air main pipe 20 is connected to the exhaust gas outlet pipe of the enameling furnace 300. A temperature sensor 16 and a heating mechanism 17 are respectively connected to the hot air main pipe 20. A pipe valve 18 is connected to both the hot air inlet pipe 4 and the hot air main pipe 20. In use, the high-temperature exhaust gas discharged from the enameling furnace 300 enters the hot air main pipe 20 through the exhaust gas outlet pipe. Then, the temperature sensor 16 and the heating mechanism 17 are used to measure the temperature of the high-temperature exhaust gas and perform secondary heating so that the high-temperature exhaust gas reaches the specified temperature after heating.

[0075] A bypass valve 19 is connected to one side of the hot air inlet pipe 4. The bypass valve 19 is used to open when the pipe valve 18 is closed and allow outside air to enter the baking chamber 2 through the hot air inlet pipe 4 to cool the insulating varnish layer.

[0076] This embodiment is applicable to the simultaneous processing of multiple enameled wires of one specification or two different specifications. When the enameled wire to be processed is of one specification, the insulating varnish layer on the surface of the enameled wire is baked separately in the enameling furnace 300 until fully cured after coating. At this time, the pipe valve 18 of the hot air inlet pipe 4 is closed and the bypass valve 19 is opened, so that when the enameled wire passes through the housing 1, external air can enter the baking chamber 2 through the hot air inlet pipe 4, and under the guidance of the upper guide plate 9 and the lower guide plate 10, it flows in an S-shape and blows away the insulating varnish layer on the surface of the enameled wire, thus achieving a cooling effect. At the same time, the air outside the outlet 6 enters the cooling chamber 3 under the action of the air pump, and under the guidance of the upper guide plate 9 and the lower guide plate 10, blows away the insulating varnish layer on the surface of the enameled wire in the same way, thus achieving a cooling effect. Through two cooling processes on the insulating varnish layer on the surface of the enameled wire, the temperature of the insulating varnish layer can be reduced to below the safe threshold, so that the insulating varnish layer will not suffer adhesion damage due to excessive temperature during subsequent wiring.

[0077] When there are two specifications of enameled wire to be processed, one specification of enameled wire is cooled separately in the manner described above. The bypass valve 19 corresponding to the other specification of enameled wire is closed and the pipeline valve 18 is opened, so that the high-temperature airflow enters the baking chamber 2 after being heated to the specified temperature, and blows the insulating varnish layer on the surface of the enameled wire along the upper guide plate 9 and the lower guide plate 10 to achieve the curing function of the insulating varnish layer.

[0078] Based on this, during the initial debugging phase, operators can adjust the tilt angles of the upper guide plate 9 and lower guide plate 10 within the baking chamber 2 using adjustable components, thereby regulating the curing effect on the insulating varnish layer. When the angles of the upper guide plate 9 and lower guide plate 10 are relatively small, the airflow path is smoother and the heat exchange efficiency for the insulating varnish layer is lower, resulting in a relatively lower curing rate. Conversely, when the angles of the upper guide plate 9 and lower guide plate 10 are relatively large, the turning radius of the airflow path increases and the heat exchange efficiency for the insulating varnish layer improves, resulting in a relatively higher curing rate. Operators can then adjust the tilt angles according to the desired curing effect of the insulating varnish layer, thus adapting to different specifications of insulating varnish layers without changing the wire speed and airflow temperature.

[0079] Example 4. Coating apparatus, configured as follows Figure 5As shown, the coating processes in both Examples 1 and 2 are performed using this coating device. The coating device includes an enameling frame 100, on which a coating mechanism 200, an enameling furnace 300, and a secondary drying oven 400 are sequentially arranged along the wiring direction. The secondary drying oven 400 includes a box body 1, inside which a baking chamber 2 and a cooling chamber 3 are sequentially formed along the wiring direction. The inner walls of the baking chamber 2 and the cooling chamber 3 are covered with a heat insulation layer. A hot air inlet pipe 4 is connected to one side of the baking chamber 2, and a hot air outlet pipe 5 is connected to the other side of the baking chamber 2. An outlet 6 is formed on one side of the cooling chamber 3, and a cold air outlet pipe 7 is connected to the other side of the cooling chamber 3. Both the ends of the hot air outlet pipe 5 and the cold air outlet pipe 7 are connected to an exhaust pipe 8, and an air pump is connected to the exhaust pipe 8.

[0080] The coating mechanism 200 is used to coat the surface of the copper wire with an insulating varnish layer;

[0081] The enameling furnace 300 is used for the first baking of the insulating varnish layer on the surface of the copper wire;

[0082] The baking chamber 2 is used to perform a second baking of the insulating varnish layer on the surface of the copper wire;

[0083] The cooling chamber 3 is used to cool the insulating varnish layer.

[0084] The painting mechanism 200 and the enameling furnace 300 are both conventional painting mechanisms 200 and enameling furnaces 300 used in enameling machines. The enameling furnace 300 is equipped with a hot air circulation mechanism for controlling the furnace temperature, and the hot air circulation mechanism is equipped with an exhaust pipe for exhausting gas.

[0085] The baking chamber 2 is equipped with a first air guide assembly, and a first wiring channel for wiring is formed in the middle of the first air guide assembly; the cooling chamber 3 is equipped with a second air guide assembly, and a second wiring channel for wiring is formed in the middle of the second air guide assembly.

[0086] Both the first air guide assembly and the second air guide assembly include multiple sets of guide plates distributed at intervals in the housing 1 along the wiring direction. Each set of guide plates includes a split upper guide plate 9 and a lower guide plate 10. The upper guide plate 9 and the lower guide plate 10 are symmetrically distributed in a figure-eight shape on the upper and lower sides of the first wiring channel or the second wiring channel.

[0087] The upper guide plate 9 and the lower guide plate 10 of the second air guide assembly are fixedly connected to the housing 1, and the upper guide plate 9 and the lower guide plate 10 of the first air guide assembly are connected to the housing 1 via an adjustment assembly;

[0088] The upper guide plate 9 and the lower guide plate 10 of the first air guide assembly are both connected to a rotating shaft 11. The two ends of the rotating shaft 11 are rotatably connected to the housing 1. The adjustment assembly includes a transmission gear 12 fixedly connected to one side of the rotating shaft 11. The end of the transmission gear 12 extends to the outside of the housing 1 and is connected to a drive rack 13. The same drive rack 13 is simultaneously connected to the transmission gears 12 of multiple upper guide plates 9 or lower guide plates 10. The drive rack 13 is slidably connected to the outer wall of the housing 1. The drive rack 13 is connected to a drive rod 14. The drive rod 14 can be an electric push rod. The drive rod 14 is used to adjust the included angle between the upper guide plate 9 and the lower guide plate 10 by extension and retraction, thereby controlling the baking effect of the insulating varnish layer.

[0089] Each set of adjustment components has two drive rods 14. The two drive rods 14 are fixedly connected to the top and bottom of the housing 1, respectively. Each drive rod 14 has a drive rack 13 connected to its end. The two drive racks 13 are respectively connected to the transmission gear 12 corresponding to the upper guide plate 9 and the transmission gear 12 corresponding to the lower guide plate 10.

[0090] Multiple processing chambers are arranged side by side along the width direction of the enameling machine frame 100 inside the housing 1. There are three or more sets of processing chambers. Each processing chamber is equipped with a baking chamber 2 and a cooling chamber 3. Adjacent processing chambers are separated by partitions 15. The hot air inlet pipes 4 of multiple baking chambers 2 are connected to the same hot air main pipe 20. The hot air outlet pipes 5 of multiple baking chambers 2 and the cold air outlet pipes 7 of multiple cooling chambers 3 are connected to the same exhaust pipe 8. There are multiple first air guide components and second air guide components, which are respectively installed in each baking chamber 2 and cooling chamber 3.

[0091] The outer end of the hot air main pipe 20 is connected to the exhaust gas outlet pipe of the enameling furnace 300. A temperature sensor 16 and a heating mechanism 17 are respectively connected to the hot air main pipe 20. A pipe valve 18 is connected to both the hot air inlet pipe 4 and the hot air main pipe 20. In use, the high-temperature exhaust gas discharged from the enameling furnace 300 enters the hot air main pipe 20 through the exhaust gas outlet pipe. Then, the temperature sensor 16 and the heating mechanism 17 are used to measure the temperature of the high-temperature exhaust gas and perform secondary heating so that the high-temperature exhaust gas reaches the specified temperature after heating.

[0092] A bypass valve 19 is connected to one side of the hot air inlet pipe 4. The bypass valve 19 is used to open when the pipe valve 18 is closed and allow outside air to enter the baking chamber 2 through the hot air inlet pipe 4 to cool the insulating varnish layer.

[0093] This embodiment is applicable to the simultaneous processing of multiple enameled wires of three or more specifications. When it is necessary to bake and cure insulating varnish layers of different specifications, the operator can adjust the tilt angle of the guide plate group in different baking chambers 2 to make each baking chamber 2 form a different baking effect; and each baking chamber 2 corresponds to a different insulating varnish layer, so that different insulating varnish layers can achieve the required curing effect after baking.

Claims

1. A coating process for enameled wires to resist enamel film aging, characterized in that, Includes the following steps: A. Coat the surface of the copper wire with an insulating varnish layer, then proceed to step B; B. Perform a first baking on the insulating varnish layer on the surface of the copper wire. If the insulating varnish layer is completely cured after the first baking, proceed to step C. If the insulating varnish layer is not completely cured after the first baking, proceed to step D. C. Cool the insulating varnish layer on the surface of the copper wire, and proceed to step E; D. First, bake the insulating varnish layer on the surface of the copper wire a second time to completely cure the insulating varnish layer, then cool the insulating varnish layer and proceed to step E; E. Repeat steps A-D to coat the surface of the copper wire with multiple layers of insulating varnish to obtain the finished enameled wire.

2. The anti-aging enameled wire coating process according to claim 1, characterized in that: In step E, a first insulating varnish film and a second insulating varnish film are formed on the surface of the enameled wire. Both the first insulating varnish film and the second insulating varnish film are composed of multiple insulating varnish layers. The insulating varnish layer corresponding to the first insulating varnish film is coated in the order of step A-step B-step C, and the insulating varnish layer corresponding to the second insulating varnish film is coated in the order of step A-step B-step D.

3. The anti-aging enameled wire coating process according to claim 1, characterized in that: The enameled wire in step E is either the first enameled wire or the second enameled wire. The first enameled wire is prepared in the order of step A-step B-step C, and the second enameled wire is prepared in the order of step A-step B-step D.

4. A coating apparatus, wherein the anti-aging enameled wire coating process according to any one of claims 1-3 is performed using this coating apparatus, characterized in that: The equipment includes an enameling frame (100), on which a painting mechanism (200), an enameling furnace (300) and a secondary oven (400) are arranged sequentially along the wiring direction. The secondary oven (400) includes a box body (1), and a baking chamber (2) and a cooling chamber (3) are formed sequentially along the wiring direction inside the box body (1). A hot air inlet pipe (4) is connected to one side of the baking chamber (2), and a hot air outlet pipe (5) is connected to the other side of the baking chamber (2). An outlet (6) is formed on one side of the cooling chamber (3), and a cold air outlet pipe (7) is connected to the other side of the cooling chamber (3). An exhaust pipe (8) is connected to the ends of both the hot air outlet pipe (5) and the cold air outlet pipe (7). An air pump is connected to the exhaust pipe (8). The coating mechanism (200) is used to coat the surface of the copper wire with an insulating varnish layer; The enameling furnace (300) is used for the first baking of the insulating varnish layer on the surface of the copper wire; The baking chamber (2) is used to bake the insulating varnish layer on the surface of the copper wire a second time; The cooling chamber (3) is used to cool the insulating varnish layer.

5. The coating apparatus according to claim 4, characterized in that: The baking chamber (2) is provided with a first air guide assembly, and a first wiring channel for wiring is formed in the middle of the first air guide assembly; the cooling chamber (3) is provided with a second air guide assembly, and a second wiring channel for wiring is formed in the middle of the second air guide assembly. The first air guide assembly and the second air guide assembly both include multiple sets of guide plates distributed at intervals in the housing (1) along the routing direction. Each set of guide plates includes a split upper guide plate (9) and a lower guide plate (10). The upper guide plate (9) and the lower guide plate (10) are symmetrically distributed in a figure-eight shape on the upper and lower sides of the first routing channel or the second routing channel.

6. The coating apparatus according to claim 5, characterized in that: The upper guide plate (9) and lower guide plate (10) of the second air guide assembly are fixedly connected to the housing (1), and the upper guide plate (9) and lower guide plate (10) of the first air guide assembly are connected to the housing (1) via an adjustment assembly. The upper guide plate (9) and the lower guide plate (10) of the first air guide assembly are both connected to a rotating shaft (11). The two ends of the rotating shaft (11) are rotatably connected to the housing (1). The adjustment assembly includes a transmission gear (12) fixedly connected to one side of the rotating shaft (11). The end of the transmission gear (12) extends to the outside of the housing (1) and is connected to a drive rack (13). The drive rack (13) is connected to a drive rod (14). The drive rod (14) is used to adjust the included angle between the upper guide plate (9) and the lower guide plate (10) by extension and retraction.

7. The coating apparatus according to claim 6, characterized in that: Each set of adjustment components has one drive rod (14). The drive rod (14) is fixedly connected to the side wall of the housing (1). The end of the drive rod (14) is connected to two drive racks (13) through the middle rod. The two drive racks (13) are respectively connected to the transmission gear (12) corresponding to the upper guide plate (9) and the transmission gear (12) corresponding to the lower guide plate (10). Alternatively, each set of adjustment components has two drive rods (14), which are fixedly connected to the top and bottom of the housing (1) respectively. Each drive rod (14) is connected to a drive rack (13) at its end. The two drive racks (13) are connected to the transmission gear (12) corresponding to the upper guide plate (9) and the transmission gear (12) corresponding to the lower guide plate (10) respectively.

8. The coating apparatus according to claim 4, characterized in that: Multiple processing chambers are arranged side by side in the box (1) along the width direction of the enameling machine frame (100). Each processing chamber is equipped with a baking chamber (2) and a cooling chamber (3). Adjacent processing chambers are separated by partitions (15). The hot air inlet pipes (4) of multiple baking chambers (2) are connected to a hot air main pipe (20) at the end. The hot air outlet pipes (5) of multiple baking chambers (2) and the cold air outlet pipes (7) of multiple cooling chambers (3) are connected to the same exhaust pipe (8).

9. The coating apparatus according to claim 8, characterized in that: The outer end of the hot air main pipe (20) is connected to the exhaust pipe of the enameling furnace (300). A temperature sensor (16) and a heating mechanism (17) are respectively connected to the hot air main pipe (20). A pipe valve (18) is connected to both the hot air inlet pipe (4) and the hot air main pipe (20).

10. The coating apparatus according to claim 9, characterized in that: A bypass valve (19) is connected to one side of the hot air inlet pipe (4). The bypass valve (19) is used to open when the pipe valve (18) is closed and allow outside air to enter the baking chamber (2) through the hot air inlet pipe (4) to cool the insulating varnish layer.

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