An apparatus and process for uniformly coating an undercoat and a topcoat on enameled wire

Abstract

The present invention discloses a uniform coating device and process for the primer and topcoat of enameled wire. Among them, the coating device includes a bracket and a conveying mechanism. The bracket is also provided with a primer coating mechanism and a topcoat coating mechanism arranged in sequence along the conveying direction of the enameled wire. An anti-foaming component is arranged between the primer coating mechanism and the topcoat coating mechanism. The anti-foaming component includes a heating sleeve arranged on the bracket for the enameled wire to pass through. By applying uniform pressure to the enameled wire through an elastic pressing wheel, combined with the heating effect of the heated air flow entering the heating sleeve on the primer, the solvent vapor is discharged in time, avoiding coating problems caused by steam condensation and the generation of bubbles during the subsequent topcoat coating, ensuring a stable and efficient coating process, and improving the coating effect and stability of the primer and topcoat of the enameled wire.

Description

Technical Field

[0001] The present invention relates to the field of enamelled wire painting equipment, and specifically to a device and process for uniformly coating primer and topcoat on enamelled wire. Background Art

[0002] Enamelled wire painting is a common process for protecting enamelled wire. Traditional enamelled wire painting is completed using a felt layer, which is fixed by two clamping plate structures at the upper and lower ends. The enamelled wire passes through the felt layer to achieve the painting operation of the enamelled wire. Although the felt layer can be used for enamelled wire painting, when using the traditional felt layer for painting, only one type of paint surface can be coated, and it is impossible to coat the primer and topcoat on one painting device without replacing the felt layer.

[0003] In the prior art, for example, a painting device for coating primer and topcoat on enamelled wire disclosed in a Chinese invention patent application (publication number CN110586409A) has a structure including a placement flat plate. A primer coating mechanism for primer coating and a topcoat coating mechanism for topcoat coating are provided on the placement flat plate. A paint liquid storage part for storing paint liquid is provided below each of the primer coating mechanism and the topcoat coating mechanism. The paint liquid storage part includes a paint liquid storage tank. The primer coating mechanism includes a first rotating shaft, and a painting roller shaft is provided on the first rotating shaft. The topcoat coating mechanism includes a second rotating shaft, and a painting roller shaft is provided on the second rotating shaft. A wire guiding part for the enamelled wire to pass through is provided on the painting roller shaft. The wire guiding part includes a plurality of wire guiding grooves. The painting roller shafts on the first rotating shaft and the second rotating shaft are distributed at intervals. The painting roller shafts on the first rotating shaft and the second rotating shaft are staggeredly distributed. The first rotating shaft and the second rotating shaft are connected with a driving part for controlling the rotation of the first rotating shaft and the second rotating shaft.

[0004] According to the above prior art, this painting device can realize the primer and topcoat coating of the same enamelled wire by one painting device by simultaneously providing a primer coating mechanism and a topcoat coating mechanism on one painting device. However, after the primer coating is completed, if the solvent or moisture in the primer has not completely volatilized, when the topcoat is applied, under the influence of heat or pressure, the gas formed by the evaporation of the solvent or moisture is enclosed between the primer and the topcoat, which may cause bubbles to generate. Therefore, there is a need for a coating device that can eliminate bubbles and ensure uniform coating of the primer and the topcoat. Summary of the Invention

[0005] Aiming at the problems existing in the prior art, a uniform coating device for the primer and topcoat of enameled wire is provided. By applying uniform pressure to the enameled wire through elastic pressure wheels and combining the heating effect of the heating air flow entering the heating sleeve on the primer, the solvent vapor is discharged in time to avoid coating problems caused by steam condensation and the generation of bubbles during the subsequent topcoat coating, ensuring the stability and high efficiency of the coating process and improving the coating effect and stability of the primer and topcoat of the enameled wire.

[0006] To solve the problems of the prior art, the present invention provides a uniform coating device for the primer and topcoat of enameled wire, including a bracket and a conveying mechanism arranged on the bracket for conveying the enameled wire. The bracket is also provided with a primer coating mechanism and a topcoat coating mechanism arranged in sequence along the conveying direction of the enameled wire. Both the primer coating mechanism and the topcoat coating mechanism have a felt layer for wrapping the enameled wire. An anti-foaming component is arranged between the primer coating mechanism and the topcoat coating mechanism. The anti-foaming component includes a heating sleeve arranged on the bracket for the enameled wire to pass through. The inner diameter of the heating sleeve is larger than the diameter of the enameled wire. In the working state of the heating sleeve, the solvent in the primer on the surface of the enameled wire is accelerated to volatilize. The heating sleeve is provided with a supporting structure for keeping the enameled wire coaxial with the heating sleeve.

[0007] Preferably, the anti-foaming component further includes elastic pressure wheels symmetrically arranged on the upper and lower sides of the heating sleeve. Both of the elastic pressure wheels can move along the direction perpendicular to the axis of the heating sleeve. An opening for the elastic pressure wheels to pass through is formed on the heating sleeve. When the two elastic pressure wheels squeeze the enameled wire, the primer is in a compacted state so that the solvent therein migrates to the surface.

[0008] Preferably, an air inlet and an air outlet communicated with the heating sleeve are respectively arranged at the front end and the rear end of the heating sleeve. A negative pressure path for the air flow to flow is between the air inlet and the air outlet. In the state of air flow operation, the vapor of the solvent volatilized from a part of the primer of the enameled wire passing through the heating sleeve is in a state of being quickly discharged.

[0009] Preferably, the opening on the heating sleeve is provided with a sealing gasket that can adapt to the elastic pressure wheel. One of the supporting structures is arranged at each end of the heating sleeve. The supporting structure is specifically an air cushion arranged around the enameled wire. When the enameled wire passes through the heating sleeve, a sealed space is formed inside the heating sleeve.

[0010] Preferably, a housing is arranged at the position corresponding to each elastic pressure wheel on the bracket. The elastic pressure wheel is rotatably arranged on the housing. A drainage channel for guiding the gas to impact the surface of the elastic pressure wheel to achieve a cleaning effect is formed at the position of each housing facing the elastic pressure wheel. The surface of the elastic pressure wheel has a flexible layer.

[0011] Preferably, an air inlet and an air outlet are respectively provided on both sides of each drainage channel on the heating sleeve. An intake pipe and an exhaust pipe communicating with each air inlet and air outlet are respectively provided on the outer shell, and a branch pipe is connected between each intake pipe and the corresponding drainage channel.

[0012] Preferably, a heating layer is provided on each intake pipe to achieve a heating effect so that the air flow entering the heating sleeve is hot air.

[0013] Preferably, the primer coating mechanism and the topcoat coating mechanism respectively have two coating rollers for clamping the enameled wire therein. A felt layer is wound around each coating roller, and each coating roller is rotatably arranged on the outer shell. When the felt layer on the coating roller contacts the enameled wire, the flexible layer on the elastic pressure wheel is in a state of contacting the enameled wire simultaneously.

[0014] Preferably, the coating roller of the primer coating mechanism has a roller rotating shaft rotatably arranged on the outer shell, and the elastic pressure wheel has a pressure wheel rotating shaft rotatably arranged on the outer shell. A synchronous belt is provided between the roller rotating shaft and the pressure wheel rotating shaft on each outer shell.

[0015] The present invention also provides a uniform coating process for the primer and topcoat of enameled wire, including the following steps:

[0016] S1. The enameled wire is fed into the primer coating mechanism through the conveying mechanism to complete the primer coating;

[0017] S2. The enameled wire after primer coating enters the heating sleeve of the defoaming assembly to accelerate the volatilization of the solvent in the primer;

[0018] S3. The enameled wire after being processed by the defoaming assembly enters the topcoat coating mechanism to complete the topcoat coating.

[0019] The beneficial effects of this application compared with the prior art are as follows:

[0020] 1. By applying uniform pressure to the enameled wire through the elastic pressure wheel, the present invention realizes the compaction of the primer coating and the migration of the solvent to the surface. Combined with the heating effect of the heating sleeve, the solvent volatilization is significantly accelerated, effectively reducing the residual bubbles.

[0021] At the same time, the elastic pressure wheel makes the surface of the primer smoother and denser, enhancing the ability of the coating to resist temperature and pressure changes, and reducing the risk of bubble generation during subsequent topcoat coating. Ensure the stability and efficiency of the coating process, and improve the adhesion quality of the primer and the overall coating performance.

[0022] 2. By forming a negative pressure path through the air inlet and air outlet of the heating sleeve and combining with an external air extraction device, the present invention realizes the timely discharge of the solvent vapor, avoiding the coating quality problems caused by steam condensation and the generation of bubbles during subsequent topcoat coating.

[0023] During the transportation of the enameled wire, the air cushion scrapes off the excess primer, improving the flatness and uniformity of the primer coating, and at the same time protecting the surface of the enameled wire from being scratched. And the sealing gasket and the air cushion ensure the airtightness inside the heating sleeve, prevent impurities from entering, and improve the coating effect and stability of the enameled wire.

[0024] 3. By setting a drainage channel and a branch pipeline on the outer shell of the present invention, the air flow introduced through the air inlet is guided to the drainage channel through the branch pipeline to form a high-speed air flow impacting the surface of the elastic pressure wheel, realizing the automatic cleaning of its flexible layer and preventing the influence of primer residue on the coating quality.

[0025] At the same time, the hot air flow enters the heating sleeve, accelerating the volatilization of the solvent in the primer, ensuring that no bubbles are generated during the subsequent coating of the topcoat, and improving the coating uniformity of the overall coating of the enameled wire. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic three-dimensional structure diagram of a device for uniformly coating the primer and topcoat of enameled wire according to the present invention.

[0027] Figure 2 is a plane cross-sectional view of a device for uniformly coating the primer and topcoat of enameled wire according to the present invention.

[0028] Figure 3 is a schematic three-dimensional structure cross-sectional view of a device for uniformly coating the primer and topcoat of enameled wire according to the present invention.

[0029] Figure 4 is a schematic three-dimensional structure diagram of the primer coating mechanism and the defoaming component of a device for uniformly coating the primer and topcoat of enameled wire according to the present invention.

[0030] Figure 5 is a schematic three-dimensional structure diagram of the defoaming component of a device for uniformly coating the primer and topcoat of enameled wire according to the present invention.

[0031] Figure 6 is a schematic exploded three-dimensional structure diagram of the defoaming component of a device for uniformly coating the primer and topcoat of enameled wire according to the present invention.

[0032] Figure 7 is a left view of the defoaming component of a device for uniformly coating the primer and topcoat of enameled wire according to the present invention.

[0033] Figure 8 is a plane cross-sectional view of the defoaming component of a device for uniformly coating the primer and topcoat of enameled wire according to the present invention.

[0034] Figure 9 is of the present invention Figure 7Stereoscopic structure sectional view at A-A

[0035] Figure 10 It is a partial stereoscopic structure sectional view of the heating sleeve and the elastic pressing wheel of a uniform coating device for the primer and topcoat of enameled wire according to the present invention.

[0036] The reference numerals in the figure are: 1, bracket; 11, housing; 111, drainage channel; 112, branch pipeline; 2, primer coating mechanism; 21, coating roller; 211, through hole; 22, felt layer; 3, topcoat coating mechanism; 4, defoaming component; 41, heating sleeve; 411, air inlet; 4111, air inlet pipeline; 4112, heating layer; 4113, hose; 412, air outlet; 4121, air outlet pipeline; 42, elastic pressing wheel; 421, flexible layer; 422, roller rotating shaft; 423, pressing wheel rotating shaft; 424, synchronous belt; 43, sealing gasket; 5, support structure; 6, enameled wire. Detailed implementation manners

[0037] In order to further understand the features, technical means, specific purposes and functions achieved by the present invention, the present invention will be further described in detail below in conjunction with the drawings and specific implementation manners.

[0038] See Figures 1 - 6 and Figure 9 As shown, a uniform coating device for the primer and topcoat of enameled wire includes a bracket 1 and a conveying mechanism arranged on the bracket 1 for conveying the enameled wire 6. The bracket 1 is further provided with a primer coating mechanism 2 and a topcoat coating mechanism 3 arranged in sequence along the conveying direction of the enameled wire 6. The primer coating mechanism 2 and the topcoat coating mechanism 3 both have a felt layer 22 wrapping the enameled wire 6. A defoaming component 4 is arranged between the primer coating mechanism 2 and the topcoat coating mechanism 3. The defoaming component 4 includes a heating sleeve 41 arranged on the bracket 1 for the enameled wire 6 to pass through. The inner diameter of the heating sleeve 41 is larger than the diameter of the enameled wire 6. In the working state of the heating sleeve 41, the solvent in the primer on the surface of the enameled wire 6 is accelerated to volatilize. The heating sleeve 41 is provided with a support structure 5 for keeping the enameled wire 6 coaxial with the heating sleeve 41.

[0039] The conveying mechanism is not shown in the figure.

[0040] A plurality of the heating sleeves 41 are evenly distributed on the bracket 1, and each heating sleeve 41 passes through an enameled wire 6. Through the arrangement of the plurality of heating sleeves 41, the primer and topcoat of a plurality of enameled wires 6 can be coated simultaneously and the bubble treatment can be carried out.

[0041] When the enameled wire 6 is introduced into the conveying mechanism from one end, the conveying mechanism smoothly conveys the enameled wire 6 to the working area of the coating device. The conveying mechanism ensures that the enameled wire 6 remains straight and is not distorted or stretched during the entire conveying process, thus providing a good foundation for subsequent coating.

[0042] When the enameled wire 6 reaches the primer coating mechanism 2, it first comes into contact with the felt layer 22. The felt layer 22 contains a certain amount of primer liquid. When the enameled wire 6 passes through the felt layer 22, the primer will be evenly applied to the surface of the enameled wire 6. After the enameled wire 6 leaves the primer coating mechanism 2, it immediately enters the heating sleeve 41 in the defoaming assembly 4. The inner diameter of the heating sleeve 41 is larger than the diameter of the enameled wire 6, ensuring that the enameled wire 6 can move freely therein without excessive friction. The main function of the heating sleeve 41 is to accelerate the volatilization of the solvent in the primer on the surface of the enameled wire 6. When the heating sleeve 41 is in operation, the temperature inside it rises, causing the solvent in the primer to evaporate rapidly. This is beneficial for the subsequent coating of the topcoat, preventing the formation of bubbles due to the influence of heat or pressure on the residual substances after the primer is coated with the topcoat, and ensuring the uniform coating degree of the overall coating of the enameled wire 6.

[0043] At the same time, the support structure 5 provided on the heating sleeve 41 ensures that the enameled wire 6 always remains coaxial with the heating sleeve 41, avoiding the excessive friction of the primer by the inner wall of the heating sleeve 41 due to position deviation and affecting the uniform distribution of the primer.

[0044] After the enameled wire 6 completes the volatilization of the solvent in the primer, it continues to move towards the topcoat coating mechanism 3. The function of the topcoat coating mechanism 3 is similar to that of the primer coating mechanism 2, but its main task is to further form a smooth and wear-resistant topcoat coating on the basis of the primer coating. The topcoat coating mechanism 3 also uses the felt layer 22 that wraps the enameled wire 6, and the felt layer 22 is infiltrated with the topcoat solution. When the enameled wire 6 passes through the felt layer 22, the topcoat will evenly cover the primer coating.

[0045] When the enameled wire 6 completes the topcoat coating, the entire uniform coating process is completed. At this time, the enameled wire 6 already has a complete primer and topcoat coating.

[0046] See Figures 1 - 10 As shown, the defoaming assembly 4 further includes elastic pressure wheels 42 symmetrically arranged on the upper and lower sides of the heating sleeve 41. Both of the elastic pressure wheels 42 can move along the direction perpendicular to the axis of the heating sleeve 41. An opening for the elastic pressure wheels 42 to pass through is provided on the heating sleeve 41. When the two elastic pressure wheels 42 squeeze the enameled wire 6, the primer is in a compacted state so that the solvent therein migrates to the surface.

[0047] When the enameled wire 6 passes through the heating sleeve 41, two elastic pressing wheels 42 apply appropriate pressure to the enameled wire 6. When the two elastic pressing wheels 42 squeeze the enameled wire 6, the primer coating is in a compacted state. Since the solvent has a certain fluidity, it will preferentially diffuse from the inside of the coating to the surface under external pressure. That is, the solvent in the primer will be squeezed and forced to migrate to the area with less pressure, namely the surface of the primer. With the heating efficiency of the heating sleeve 41, the speed of solvent volatilization is significantly accelerated, and at the same time, the bubble residues inside the primer coating are effectively reduced.

[0048] The pressure of the elastic pressing wheels 42 can also make the surface of the primer smoother and reduce depressions. When applying the topcoat subsequently, even if the primer is heated or under pressure, due to less solvent residue, the possibility of bubble generation is greatly reduced. It can prevent the solvent vapor inside the primer from expanding to form bubbles when heated or under pressure. Make the primer adhere more densely to the enameled wire 6, reducing internal voids and defects. The dense primer layer has stronger resistance to external pressure and temperature changes, further reducing the risk of bubble generation.

[0049] In addition, the elastic pressing wheels 42 adjust their positions in real time according to the state of the primer on the enameled wire 6, so as to ensure that uniform pressure is always applied throughout the coating process. The thickness of the enameled wire 6 is monitored by a sensor and the data is fed back to the control system, and finally the control system issues an instruction to adjust the pressure of the elastic pressing wheels 42. The sensor is not shown in the figure.

[0050] See Figures 3 - 8 and Figure 10 As shown, an air inlet 411 and an air outlet 412 communicating with it are respectively provided at the front end and the rear end of the heating sleeve 41. Between the air inlet 411 and the air outlet 412 is a negative pressure path for air flow. In the air flow operation state, the vapor of the solvent volatilized from a part of the primer of the enameled wire 6 passing through the heating sleeve 41 is in a state of being quickly discharged.

[0051] When the enameled wire 6 passes through the heating sleeve 41, the vapor generated by solvent volatilization needs to be discharged in time to avoid its accumulation inside the heating sleeve 41, thus affecting the coating quality. A low-pressure environment is created at the air outlet 412 by an external air extraction device, so that air enters from the air inlet 411 and flows rapidly along the inside of the heating sleeve 41, and finally discharges from the air outlet 412. The air flow operation state not only provides good ventilation conditions inside the heating sleeve 41, but also can effectively take away the solvent vapor volatilized from the primer on the surface of the enameled wire 6.

[0052] Specifically, when the enameled wire 6 enters the heating sleeve 41, the temperature of the heating sleeve 41 accelerates the volatilization of the solvent in the primer, forming a large amount of steam. If the steam cannot be discharged in time, it may re-condense on the surface of the enameled wire 6 or the inner wall of the heating sleeve 41, resulting in a decline in the coating quality or even new bubble problems. After the fresh air introduced through the air inlet 411 is mixed with the solvent steam, it quickly flows towards the air outlet 412 under the action of negative pressure. This ensures that the solvent steam can be completely carried away from the heating sleeve 41 without staying inside.

[0053] See Figure 8 As shown, the opening on the heating sleeve 41 is provided with a sealing gasket 43 that can adapt to the elastic pressure wheel 42. Both ends of the heating sleeve 41 are provided with one of the support structures 5. The support structure 5 is specifically an air cushion surrounding the enameled wire 6. When the enameled wire 6 passes through the heating sleeve 41, a sealed space is formed inside the heating sleeve 41.

[0054] The air cushion has the function of scraping off the excess primer, improving the flatness and uniformity of the primer surface.

[0055] When the enameled wire 6 passes through the heating sleeve 41, the elastic pressure wheel 42 applies pressure to the enameled wire 6 through the opening. The sealing gasket 43 simultaneously maintains the airtightness inside the heating sleeve 41, effectively preventing the external air with impurities from entering the inside of the heating sleeve 41.

[0056] At the same time, when the enameled wire 6 passes through the heating sleeve 41, the air cushion will have slight contact with the surface of the enameled wire 6, and the air cushion is used to scrape off the excess primer from the surface of the enameled wire 6. This improves the flatness and uniformity of the primer coating, reducing bubble problems or defects caused by too thick primer. In addition, it effectively avoids the direct contact between the enameled wire 6 and hard components, thereby reducing the risk of surface scratches and protecting the integrity of the enameled wire 6.

[0057] See Figure 3 、 Figure 7 and Figure 8 As shown in, at the position corresponding to each elastic pressure wheel 42 on the bracket 1, there is a housing 11. The elastic pressure wheel 42 is rotatably arranged on the housing 11. At the position of each housing 11 facing the elastic pressure wheel 42, there is a drainage channel 111 for guiding gas to impact the surface of the elastic pressure wheel 42 to achieve a cleaning effect. The surface of the elastic pressure wheel 42 has a flexible layer 421.

[0058] The bracket 1 is provided with a driver for driving the relative movement of the two housings 11. The driver is not shown in the figure.

[0059] When the enameled wire 6 passes through the elastic pressure wheel 42, part of the primer may remain on the surface of the elastic pressure wheel 42 due to extrusion. If these residues are not cleaned in time, it will not only affect the pressure control accuracy of the elastic pressure wheel 42 on the enameled wire 6, but also may cause unevenness of the primer coating. Therefore, the drainage channel 111 ensures that the direction and speed of the air flow can achieve the best cleaning effect.

[0060] When the gas is sprayed onto the surface of the elastic pressure wheel 42 at high speed through the drainage channel 111, its impact force can quickly peel off the attached primer residues. In addition, since the surface of the elastic pressure wheel 42 is covered with a flexible layer 421, the contact performance between the elastic pressure wheel 42 and the enameled wire 6 is enhanced, preventing the enameled wire 6 from being scratched by a hard surface.

[0061] See Figure 7 、 Figure 8 and Figure 10 As shown, an air inlet 411 and an air outlet 412 are respectively provided on both sides of each drainage channel 111 on the heating sleeve 41. An intake duct 4111 and an exhaust duct 4121 communicating with each air inlet 411 and air outlet 412 are respectively provided on the outer shell 11. A branch duct 112 is connected between each intake duct 4111 and the corresponding drainage channel 111.

[0062] A hose 4113 is connected between each intake duct 4111 and the corresponding air inlet 411 and between each exhaust duct 4121 and the corresponding air outlet 412. When it is necessary to adjust the position of the elastic pressure wheel 42 to adapt to enameled wires 6 of different specifications, each intake duct 4111 and each exhaust duct 4121 move relative to the heating sleeve 41 respectively following the outer shell 11. The hose 4113 ensures connection while avoiding air leakage, creating an effective negative pressure environment in the heating sleeve 41.

[0063] At the same time, during the process of the air flow entering the heating sleeve 41 from the intake duct 4111, part of the air flow is introduced into the drainage channel 111 through the branch duct 112, which can not only achieve automatic cleaning of the surface of the elastic pressure wheel 42, but also reduce the pressure control error caused by impurity accumulation.

[0064] The setting of the branch duct 112 reasonably distributes the intake air flow to different functional areas, meeting the need to provide fresh air inside the heating sleeve 41 and providing a dedicated air flow for cleaning the elastic pressure wheel 42, significantly improving the air flow utilization efficiency.

[0065] See Figures 5 - 8 As shown, a heating layer 4112 for heating effect is provided on each intake duct 4111 to make the air flow entering the heating sleeve 41 hot air.

[0066] When the air flow passes through the intake pipe 4111, the heating layer 4112 starts to work and uses its heating performance to heat the air flow. This significantly increases the temperature of the originally normal-temperature air flow, so that it has higher thermal energy before entering the heating sleeve 41. When these hot air flows enter the heating sleeve 41 and contact the primer coating on the surface of the enameled wire 6, it can more quickly accelerate the volatilization of the solvent in the primer.

[0067] By precisely controlling the temperature of the heating layer 4112, the heating degree of the air flow can be adjusted for different types of primers, so as to achieve a more flexible and efficient coating process. This not only improves the efficiency of solvent volatilization, but also enhances the overall heat treatment ability of the heating sleeve 41, ensuring that the primer coating on the surface of the enameled wire 6 can reach an ideal state in a short time, reducing the generation of solvent residues and bubble problems during the subsequent topcoat coating.

[0068] See Figures 1 - 4 As shown, the primer coating mechanism 2 and the topcoat coating mechanism 3 respectively have two coating rollers 21 that clamp the enameled wire 6 therein. The felt layer 22 is wound around each coating roller 21, and each coating roller 21 is rotatably arranged on the housing 11. When the felt layer 22 on the coating roller 21 contacts the enameled wire 6, the flexible layer 421 on the elastic pressing wheel 42 is in a state of contacting the enameled wire 6 simultaneously.

[0069] The coating rollers 21 of the primer coating mechanism 2 and the topcoat coating mechanism 3 respectively have through holes 211 through which the primer and the topcoat can penetrate into the felt layer 22.

[0070] During the coating process of the enameled wire 6, the primer coating mechanism 2 and the topcoat coating mechanism 3 respectively achieve uniform coating treatment of the enameled wire 6 through the two coating rollers 21. When the enameled wire 6 is conveyed between the two coating rollers 21, the coating rollers 21 firmly clamp the enameled wire 6 in their felt layers 22. As the enameled wire 6 is conveyed, the coating rollers 21 rotate, and the paint liquid in the felt layer 22 is evenly attached to the surface of the enameled wire 6 through the rotational movement of the coating rollers 21.

[0071] At the same time, the flexible layer 421 on the elastic pressing wheel 42 also contacts the enameled wire 6 synchronously. Its function is not only to assist in applying appropriate pressure to ensure a consistent coating thickness, but also to further compact the primer and promote the paint liquid to adhere more tightly to the surface of the enameled wire 6.

[0072] See Figures 1 - 4 As shown, the coating roller 21 of the primer coating mechanism 2 has a roller rotating shaft 422 rotatably arranged on the housing 11, and the elastic pressing wheel 42 has a pressing wheel rotating shaft 423 rotatably arranged on the housing 11. A synchronous belt 424 is provided between the roller rotating shaft 422 and the pressing wheel rotating shaft 423 on each housing 11.

[0073] When the enameled wire 6 drives the two coating rollers 21 to rotate during the conveying process, due to the effect of the synchronous belt 424, the elastic pressure wheel 42 is in a synchronous rotation state, so that the entire circumference of the elastic pressure wheel 42 can be impacted by the air flow and effectively cleaned.

[0074] When the enameled wire 6 passes through the coating roller 21 driven by the conveying mechanism, it will drive the two coating rollers 21 to rotate, and this rotational movement is transmitted to the pressure wheel rotating shaft 423 of the elastic pressure wheel 42 through the synchronous belt 424, so that the elastic pressure wheel 42 also rotates synchronously. It ensures that the elastic pressure wheel 42 can fully contact the enameled wire 6 during the entire working process, and at the same time, the flexible layer 421 on its surface always maintains a uniform pressure distribution.

[0075] Since the elastic pressure wheel 42 is in a continuous rotation state, its entire outer circumference can be successively exposed to the range of the air flow guided by the drainage channel 111, so as to achieve effective cleaning in all directions and avoid the pollution problem caused by the residue of the primer on the surface of the elastic pressure wheel 42.

[0076] A uniform coating process for the primer and topcoat of enameled wire, which is applied to a uniform coating device for the primer and topcoat of enameled wire described above, includes the following steps:

[0077] S1. The enameled wire 6 is fed into the primer coating mechanism 2 through the conveying mechanism to complete the primer coating;

[0078] S2. The enameled wire 6 after primer coating enters the heating sleeve 41 of the defoaming assembly 4 to accelerate the volatilization of the solvent in the primer;

[0079] S3. The enameled wire 6 after being processed by the defoaming assembly 4 enters the topcoat coating mechanism 3 to complete the topcoat coating.

[0080] The present invention applies a uniform pressure to the enameled wire 6 through the elastic pressure wheel 42, combined with the heating effect of the heating air flow entering the heating sleeve 41 on the primer, realizes the compaction of the primer coating, the accelerated volatilization of the solvent and the effective reduction of the bubble residue, and improves the adhesion quality of the primer and the overall coating performance.

[0081] Effectively and timely discharge the solvent vapor to avoid the coating problems caused by the condensation of the vapor and the generation of bubbles during the subsequent topcoat coating, ensure the stable and efficient coating process, and improve the coating effect and stability of the primer and topcoat of the enameled wire 6.

[0082] The above embodiments merely represent one or several implementation manners of the present invention. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the protection scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the appended claims.

Claims

1. A device for uniformly coating primer and topcoat of enameled wire, comprising a support (1) and a conveying mechanism arranged on the support (1) for conveying the enameled wire (6), the support (1) also being provided with a primer coating mechanism (2) and a topcoat coating mechanism (3) arranged in sequence along the conveying direction of the enameled wire (6), the primer coating mechanism (2) and the topcoat coating mechanism (3) both having a felt layer (22) for wrapping the enameled wire (6); It is characterized in that A debubbling assembly (4) is provided between the primer coating mechanism (2) and the topcoat coating mechanism (3), the debubbling assembly (4) comprising a heating sleeve (41) arranged on the support (1) for the enameled wire (6) to pass through, the inner diameter of the heating sleeve (41) being larger than the diameter of the enameled wire (6), and when the heating sleeve (41) is in the working state, the solvent in the primer on the surface of the enameled wire (6) is accelerated to volatilize; The heating sleeve (41) is provided with a support structure (5) for keeping the enameled wire (6) and the heating sleeve (41) coaxial; The defoaming assembly (4) further comprises elastic pressure wheels (42) symmetrically arranged on the upper and lower sides of the heating sleeve (41); the two elastic pressure wheels (42) are both capable of moving along an axial direction perpendicular to the heating sleeve (41); the heating sleeve (41) is provided with an opening for the elastic pressure wheels (42) to pass through; when the two elastic pressure wheels (42) squeeze the enameled wire (6), the primer is in a compacted state so that the solvent therein migrates to the surface; The front end and the rear end of the heating sleeve (41) are respectively provided with an air inlet (411) and an air outlet (412) which are in communication therewith, and a negative pressure path for air flow is formed between the air inlet (411) and the air outlet (412). When the air flow is in operation, the vapor volatilized from the solvent in the primer of the enameled wire (6) passing through the heating sleeve (41) is in a state of being rapidly discharged; A housing (11) is provided at a position corresponding to each elastic pressure wheel (42) on the bracket (1), the elastic pressure wheel (42) is rotatably arranged on the housing (11), and a drainage channel (111) is provided at a position on each housing (11) directly opposite to the elastic pressure wheel (42) for guiding gas to impact the surface of the elastic pressure wheel (42) to achieve a cleaning effect, and the surface of the elastic pressure wheel (42) has a flexible layer (421); An air inlet (411) and an air outlet (412) are provided on the heating sleeve (41) and located on both sides of each drainage channel (111); an air inlet pipe (4111) and an air outlet pipe (4121) are provided on the outer shell (11) and are connected to each air inlet (411) and air outlet (412); and a branch pipe (112) is connected between each air inlet pipe (4111) and the corresponding drainage channel (111).

2. A uniform coating device for primer and topcoat of enameled wire according to claim 1, characterized in that: The opening on the heating sleeve (41) is provided with a sealing gasket (43) capable of adapting to the elastic pressure wheel (42), and a supporting structure (5) is provided at both ends of the heating sleeve (41). The supporting structure (5) is specifically an air cushion arranged around the enameled wire (6). When the enameled wire (6) passes through the heating sleeve (41), a sealed space is formed inside the heating sleeve (41).

3. The uniform coating device for primer and topcoat of enameled wire according to claim 1, characterized in that: Each air inlet pipe (4111) is provided with a heating layer (4112) for achieving a heating effect so that the airflow entering the heating sleeve (41) is hot air.

4. The uniform coating device for primer and topcoat of enameled wire according to claim 1, characterized in that: The primer coating mechanism (2) and the topcoat coating mechanism (3) respectively have two coating rollers (21) for clamping the enameled wire (6) therein, each coating roller (21) is provided with the felt layer (22) surrounding it, and each coating roller (21) is rotatably arranged on the housing (11), and when the felt layer (22) on the coating roller (21) contacts the enameled wire (6), the flexible layer (421) on the elastic pressure wheel (42) is in a state of contacting the enameled wire (6) at the same time.

5. The uniform coating device for primer and topcoat of enameled wire according to claim 4, characterized in that: The coating roller (21) of the primer coating mechanism (2) has a roller rotating shaft (422) rotatably arranged on the outer shell (11), and the elastic pressure wheel (42) has a pressure wheel rotating shaft (423) rotatably arranged on the outer shell (11). A synchronous belt (424) is provided between the roller rotating shaft (422) and the pressure wheel rotating shaft (423) on each outer shell (11).

6. A uniform coating process for primer and topcoat of enameled wire, applied to a uniform coating device for primer and topcoat of enameled wire as claimed in any one of claims 1 to 5, characterized in that: The following steps are involved: S1, the enameled wire (6) is sent to the primer coating mechanism (2) through the conveying mechanism to complete the primer coating; S2, the enameled wire (6) after being coated with primer enters the heating sleeve (41) of the defoaming component (4) to accelerate the volatilization of the solvent in the primer; S3. The enameled wire (6) treated by the defoaming component (4) enters the topcoat coating mechanism (3) to complete the topcoat coating.

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