Non-contact paint scraping device and varnished wire varnishing system
By using the airflow effect of contactless paint scraping device, the problems of uneven paint film and copper wire scratching in the prior art are solved, and uniform coating of paint film and improved straightness of copper wire are achieved.
Patent Information
- Application Number
- CN202411681892.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-22
- Publication Date
- 2025-02-11
AI Technical Summary
The existing felt board clamping and scraping method cannot ensure uniform paint film, and there are problems of copper wire scratching and paint tumor formation, which affects the straightness and winding accuracy of the enameled wire.
The contactless paint scraping device is adopted, and the air flow is used to act on the outside of the copper wire, and the air cavity and ventilation hole are formed through components such as the wire nozzle and the rotor. The air flow is made soft and uniform by using the guide blade and the air guide groove to achieve the copper wire. Scrape paint evenly and contact-free.
The uniform coating of the paint film is achieved, which avoids scratches of copper wire and lacquer tumors, improves the straightness and winding accuracy of the enameled wire, and reduces maintenance needs.
Smart Images
Figure CN119419011A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of enameled wire processing, and relates to a contact-free paint scraping device and an enameled wire painting system. Background Art
[0002] Enameled wire, also known as electromagnetic wire, is generally composed of two parts: conductor and insulation layer. The original wire with a larger diameter is repeatedly drawn and annealed to the specified size, and then painted and baked many times. Coils made of enameled wire are used in more and more small and sophisticated equipment. The technology development tends to meet the requirements of lightweight, low power consumption and high performance, especially when used in industries such as new energy vehicles and telecommunications equipment.
[0003] During the preparation process, the large diameter original wire is drawn to the specified size many times, and then painted many times to form a paint film on the paint surface, which is used to protect the wire core, insulate, and adhere to each other. There are many ways to paint, such as roller coating, sponge coating, and over-painting. However, after each painting, it is necessary to scrape the paint to achieve uniform surface coating. Multiple painting is aimed at forming a uniform film layer in small amounts and multiple times. Therefore, scraping the paint is particularly critical. At present, scraping the paint mostly uses two felt plates to clamp the enameled wire up and down. However, this cannot ensure a uniform paint film. On the one hand, the enameled wire clamped up and down is bound to have uneven force at different positions on the periphery of the enameled wire, and the microscopic paint film thickness on the left and right sides is greater. On the other hand, due to the presence of copper chips on the enameled wire before painting (although water Washing, but it cannot be completely removed), dust, etc. These foreign objects accumulate and adhere to the felt board, scratch the copper wire or attach to the copper wire for the second time, causing the copper wire to form paint nodules when it is painted next time (when there are foreign objects or scratches at the position in contact with the paint liquid, it is easy to adhere to more paint liquid and form protrusions beyond the surface of the copper wire), affecting the straightness of the enameled wire. As we all know, the enameled wire is in a stacked state when it is wound. The difference in local accuracy of the enameled wire not only seriously affects the processing performance of the winding and other machines and equipment that assumes the enameled wire is regular, thereby affecting the product performance, but also greatly affects the wire loading rate of a given space (the length of the coil that can be carried in a certain space). The adverse effects such as the above reflect the importance of uniformity of painting on the enameled wire and the drawbacks of the existing painting and scraping methods. Summary of the invention
[0004] The first purpose of the present invention is to provide a contactless paint scraping device in view of the above-mentioned problems existing in the prior art. The technical problem to be solved by the present invention is how to utilize the effect of airflow to achieve uniform paint scraping and contact-free copper wire.
[0005] This can be achieved through the following technical solutions: a contactless paint scraping device, characterized in that it includes a wire nozzle and a rotating drum rotatably connected to the wire nozzle, the rotating drum has an air hole, the wire nozzle has an end plate at one end close to the outlet of the air hole, the end plate has a threading hole coaxial with the air hole at the center position, an air cavity is formed between the outer wall of the rotating drum and the inner wall of the wire nozzle, an air discharge gap is formed between the end of the rotating drum close to the end plate and the end plate, the end plate has an air guide groove capable of guiding the airflow in the air cavity to the direction of the entrance of the air hole, the wire nozzle has at least one air inlet hole connected to the air cavity, and the air inlet hole is connected to an air source.
[0006] Furthermore, a plurality of guide vanes located in the air cavity are evenly arranged on the outer circumference of the drum, and the outlet of the air inlet is oriented toward a position that can ensure that the airflow enters the air cavity and drives the drum to rotate.
[0007] The presence of the guide vanes can make the airflow in the vent turbulent. In comparison, the airflow has a softer effect on the copper wire, has a stronger ability to eliminate blind spots, and can also prevent scale accumulation on the inner wall of the vent.
[0008] Furthermore, the air guide nozzle has two air inlet holes, which are respectively located on both sides of the axis of the rotating drum. When in use, one of the air inlet holes can be closed.
[0009] Furthermore, the vent hole is a tapered hole, and the small diameter end of the vent hole faces one side of the vent hole.
[0010] This not only facilitates threading, but also enables the vent hole to form a pressure relief structure, ensuring that the airflow is smoothly directed to the large diameter end.
[0011] The surface contact paint scraping device proposed in this scheme is different from the existing felt plate clamping paint scraping device. The clamping paint scraping device has the problems of uncontrollable holding force, the clamping gap changes with the increase of dirt accumulation, and the paint film is biased to the rear light in the clamping blind area. There is also the defect of shutdown for maintenance. In this scheme, the airflow is used to act on the outside of the copper wire in the direction of the incoming line, which is a fully surrounded airflow, thereby achieving contact-free and avoiding problems such as damage to the paint film and damage to the copper wire. At the same time, the airflow acts on the outside of the copper wire, which "drives away" the excess paint liquid on the copper wire, and forms an obvious difference in the air pressure-bearing surface for the position with uneven paint liquid thickness on the copper wire, that is, the paint liquid at the position with more paint is blown to the position with less paint, and the excess paint liquid is blown to the position of the copper wire in the direction of the incoming line where it is not scraped. The paint liquid at the position acted by the airflow is uniform, and it is only necessary to maintain the concentricity of the copper wire and the threading hole to ensure uniform coating of the paint liquid and a single small amount of coating. The control of air pressure can adjust the thickness of the paint film applied in a single time.
[0012] The second object of the present invention is to provide a wire enameling system comprising the above-mentioned paint scraping device, aiming at rationally arranging a plurality of the above-mentioned paint scraping devices so that the paint scraping devices can play a better role in the wire enameling process.
[0013] The following technical scheme can be used to achieve this: a system for painting enameled wires, comprising a paint trough and a mounting plate fixed on one side of the paint trough, wherein a plurality of paint scraping units and a plurality of drying units arranged alternately with the paint scraping units are arranged on the mounting plate along the length direction of the paint trough, wherein the paint scraping units and the drying units are each composed of two paint scraping devices, the air vents of the plurality of paint scraping devices in the same paint scraping unit are coaxial and in the same direction, the air vents of the plurality of paint scraping devices in the same paint scraping unit are coaxial and in the same direction, a cover plate located on one side of the large diameter end of the air vent is fixedly arranged on the air guide nozzle of the paint scraping device corresponding to the drying unit; the wire nozzle of the paint scraping device is fixed on the mounting plate, a paint roller is rotatably arranged in the paint trough, the copper wire passes through the paint scraping units and the drying units arranged laterally on the mounting plate in turn, a wire wheel is arranged between the paint scraping unit and the drying unit to realize the return of the copper wire, the copper wire enters the paint scraping unit after painting, and the copper wire is painted again after drying.
[0014] Furthermore, the rotating drums of two adjacent paint scraping devices in the same paint scraping unit rotate in opposite directions.
[0015] Furthermore, the rotating drums of two adjacent paint scraping devices in the same drying unit rotate in opposite directions.
[0016] By closing one air inlet and opening the other, the rotation direction of the drum can be changed. On the one hand, it can overcome the blind spot of airflow scraping paint caused by the difference in tension of the copper wire, and on the other hand, it can reduce the interference of airflow on the stability of the copper wire.
[0017] Preferably, one of the air inlets of the paint scraping device in the drying unit is used for exhaust, and the other air inlet is connected to a hot air source; one of the air inlets of the paint scraping device in the paint scraping unit is closed, and the other air inlet is connected to a cold air source.
[0018] In the traditional painting system, a single paint scraping is followed by an immediate drying process, and after drying, the paint is returned for a second painting. After repeated cycles, a paint film of designed thickness is formed. Since the paint scraping device is pneumatic, the paint scraping process has actually undergone preliminary dehydration, and the air source used is a cold air source. After a period of natural drying, the paint returns to the drying unit, which is also applicable to the paint scraping device. A hot air flow is introduced to dry the copper wire. This is different from a traditional oven that dries multiple copper wires at the same time, or serves as a shared drying machine for multiple painting of the same copper wire. This solution dries the copper wire separately, and the drying process is also a secondary smoothing of the paint film. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1This is a wiring diagram of this painting system.
[0020] Figure 2 It is a structural schematic diagram of this painting system.
[0021] Figure 3 It is a schematic diagram of the threading of a single paint scraping device.
[0022] Figure 4 It is a three-dimensional schematic diagram of a paint scraping device.
[0023] Figure 5 It is a cross-sectional view of the paint scraping device (including the cover plate).
[0024] Figure 6 It is a plan view of the drum.
[0025] In the figure, 1. wire nozzle; 2. rotating drum; 3. air vent; 4. end plate; 5. threading hole; 6. air cavity; 7. air guide groove; 8. guide vane; 9. cover plate; 10. mounting plate; 11. paint roller; 12. air inlet; a. paint scraping unit b. drying unit. DETAILED DESCRIPTION
[0026] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.
[0027] The wiring of this painting system is as follows Figure 1 As shown, the copper wire to be painted enters from one side of the paint roller 11, passes through the first paint scraping unit a in sequence, returns through the first drying unit b, passes through the paint roller 11, returns through the second paint scraping unit a, returns through the second drying unit b, and follows this rule until the copper wire passes through the other end of the paint roller 11 and is pulled out. The paint scraping unit a is set as follows: the paint scraping device used does not need a cover plate 9, the copper wire enters from the large diameter section of the drum 2, and is pulled out from the threading hole 5, maintaining coaxiality with the threading hole 5, one of the air inlet holes 12 is blocked, and cold air is introduced into the other air inlet hole 12. After driving the drum 2 to rotate, the air flow is discharged from the large diameter end of the drum 2, as shown in the specific example. Figure 3 As shown; the drying unit b is set up as follows: the paint scraping device requires a cover plate 9, the copper wire is inserted from the large diameter end of the drum 2 and pulled out from the threading hole 5, one of the air inlet holes 12 is connected to the hot air source, and the other air inlet hole 12 is used for exhaust, each air inlet hole 12 connected to cold air can supply air in a unified manner, each air inlet hole 12 connected to hot air can supply air in a unified manner, and each air vent 3 used for exhaust can be connected in parallel and discharged centrally.
[0028] like Figure 4 , Figure 5 and Figure 6As shown, the paint scraping device comprises a wire nozzle 1 and a rotating drum 2 rotatably connected in the wire nozzle 1, the rotating drum 2 has a vent hole 3, the wire nozzle 1 has an end plate 4 at one end close to the outlet of the vent hole 3, the end plate 4 has a threading hole 5 coaxial with the vent hole 3 at the center, an air cavity 6 is formed between the outer wall of the rotating drum 2 and the inner wall of the wire nozzle 1, an air release gap is formed between the end of the rotating drum 2 close to the end plate 4 and the end plate 4, the end plate 4 has an air guide groove 7 capable of guiding the airflow in the air cavity 6 to the inlet direction of the vent hole 3, and the wire nozzle 1 has at least one air inlet hole 12 connected to the air cavity 6. A plurality of guide vanes 8 located in the air cavity 6 are evenly arranged on the outer circumference of the rotating drum 2, the outlet of the air inlet hole 12 faces a position that can ensure that the airflow enters the air cavity 6 and drives the rotating drum 2 to rotate, the vent hole 3 is a tapered hole, and the small diameter end of the vent hole 3 faces one side of the vent hole 3.
[0029] The surface contact paint scraping device proposed in this scheme is different from the existing felt plate clamping paint scraping. The clamping paint scraping has the problems of uncontrollable holding force, the clamping gap changes with the increase of dirt accumulation, and the paint film is biased to the rear light in the clamping blind area. There is also the defect of shutdown for maintenance. In this scheme, the airflow is used to act on the outside of the copper wire in the direction of the incoming line, which belongs to a fully surrounded airflow, and achieves contact-free, avoiding problems such as damage to the paint film and damage to the copper wire. At the same time, the airflow acts on the outside of the copper wire, forming a "driving" effect on the excess paint liquid on the copper wire, and forming an obvious difference in the air pressure-bearing surface for the uneven thickness of the paint liquid on the copper wire, that is: the paint liquid at the position with more paint is blown to the position with less paint, and the excess paint liquid is blown to the position of the copper wire in the direction of the incoming line that has not been scraped. The paint liquid at the position acted by the airflow is uniform, and it is only necessary to maintain the concentricity of the copper wire and the threading hole 5 to ensure uniform coating of the paint liquid and a single small amount of coating. The control of air pressure can adjust the thickness of the paint film applied in a single time.
[0030] like Figure 2 The enameled wire painting system shown includes a paint trough and a mounting plate 10 fixed on one side of the paint trough, a plurality of paint scraping units a and a plurality of drying units b arranged alternately with the paint scraping units a are arranged on the mounting plate 10 along the length direction of the paint trough, the paint scraping units a and the drying units b are each composed of two paint scraping devices, the air vents 3 of the plurality of paint scraping devices in the same paint scraping unit a are coaxial and in the same direction, the air vents 3 of the plurality of paint scraping devices in the same paint scraping unit a are coaxial and in the same direction, a cover plate 9 located on one side of the large diameter end of the air vent 3 is fixedly arranged on the air guide nozzle of the paint scraping device corresponding to the drying unit b; the wire nozzle 1 of the paint scraping device is fixed on the mounting plate 10, a paint roller 11 is rotatably arranged in the paint trough, the copper wire passes through the paint scraping units a and drying units b arranged laterally on the mounting plate 10 in turn, a wire wheel is arranged between the paint scraping unit a and the drying unit b to realize the return of the copper wire, the copper wire enters the paint scraping unit a after painting, and the copper wire is painted again after drying.
[0031] In the traditional painting system, a single paint scraping is followed by an immediate drying process, and after drying, the paint is returned for a second painting, and after repeated cycles, a paint film of designed thickness is formed. Since the paint scraping device is pneumatic, the paint scraping process has actually undergone preliminary dehydration, and the air source used is a cold air source. After a period of natural drying, the paint returns to the drying unit B, which is also suitable for the paint scraping device. A hot air flow is introduced to dry the copper wire. This is different from a traditional oven that dries multiple copper wires at the same time, or serves as a shared drying machine for multiple painting of the same copper wire. This solution dries the copper wire separately, and the drying process is also a secondary smoothing of the paint film.
[0032] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.
Claims
1. A contact-free paint scraping device, characterized in that: The invention comprises a wire nozzle (1) and a rotating drum (2) rotatably connected to the wire nozzle (1), wherein the rotating drum (2) has a vent hole (3), an end of the wire nozzle (1) close to the outlet of the vent hole (3) has an end plate (4), the center of the end plate (4) has a threading hole (5) coaxial with the vent hole (3), an air cavity (6) is formed between the outer wall of the rotating drum (2) and the inner wall of the wire nozzle (1), an air discharge gap is formed between the end of the rotating drum (2) close to the end plate (4) and the end plate (4), the end plate (4) has an air guide groove (7) capable of guiding the air flow in the air cavity (6) toward the inlet direction of the vent hole (3), and the wire nozzle (1) has at least one air inlet hole (12) connected to the air cavity (6), and the air inlet hole (12) is connected to an air source.
2. A contact-free paint scraping device according to claim 1, characterized in that: A plurality of guide vanes (8) located in the air cavity (6) are evenly arranged on the outer circumference of the rotary drum (2), and the outlet of the air inlet hole (12) is oriented in a direction that ensures that the airflow enters the air cavity (6) and drives the rotary drum (2) to rotate.
3. A contact-free paint scraping device according to claim 1, characterized in that: The air guide nozzle is provided with two air inlet holes (12), which are respectively located on both sides of the axis of the rotating drum (2). When in use, one of the air inlet holes (12) can be selectively closed.
4. The contact-free paint scraping device according to claim 1, characterized in that: The vent hole (3) is a tapered hole, and the small diameter end of the vent hole (3) faces one side of the vent hole (3).
5. A wire enameling system comprising the paint scraping device according to any one of claims 1 to 5, characterized in that: The invention comprises a paint trough and a mounting plate (10) fixed on one side of the paint trough, wherein the mounting plate (10) is provided with a plurality of paint scraping units (a) and a plurality of drying units (b) arranged alternately with the paint scraping units (a) along the length direction of the paint trough, wherein the paint scraping units (a) and the drying units (b) are each composed of two paint scraping devices, wherein the vents (3) of the plurality of paint scraping devices in the same paint scraping unit (a) are coaxial and in the same direction, and the vents (3) of the plurality of paint scraping devices in the same paint scraping unit (a) are coaxial and in the same direction, and the drying units (b) are arranged so as to prevent the paint scraping devices from being damaged. ) A cover plate (9) located on one side of the large diameter end of the vent hole (3) is fixedly arranged on the air guide nozzle of the corresponding paint scraping device; the wire nozzle (1) of the paint scraping device is fixed on the mounting plate (10), and a paint roller (11) is rotatably arranged in the paint tank. The copper wire passes through the paint scraping units (a) and drying units (b) arranged transversely on the mounting plate (10) in sequence. A wire wheel is arranged between the paint scraping unit (a) and the drying unit (b) to realize the return of the copper wire. The copper wire enters the paint scraping unit (a) after being painted, and the copper wire is painted again after being dried.
6. The wire enameling system according to claim 5, characterized in that: The rotating drums (2) of two adjacent paint scraping devices in the same paint scraping unit (a) rotate in opposite directions.
7. The wire enameling system according to claim 5, characterized in that: The rotating drums (2) of two adjacent paint scraping devices in the same drying unit (b) rotate in opposite directions.
8. The wire enameling system according to claim 5, characterized in that: One of the air inlet holes (12) of the paint scraping device in the drying unit (b) is used for exhaust, and the other air inlet hole (12) is connected to a hot air source; one of the air inlet holes (12) of the paint scraping device in the paint scraping unit (a) is closed, and the other air inlet hole (12) is connected to a cold air source.