Enameled aluminum wire surface painting device

Abstract

An enameled aluminum wire surface painting device comprises a first shell, a second shell and a third shell. The second shell is arranged in the inner cavity of the first shell, a liquid supply pipe is arranged below the second shell, an immersion liquid coating cavity is formed in the second shell, and a liquid supply channel in the liquid supply pipe is communicated with the immersion liquid coating cavity. In the application, liquid is continuously supplied to the immersion liquid coating cavity in the second shell from the bottom to the top through the liquid supply pipe, and the paint liquid overflows from the third shell above the second shell to form a constant liquid level, so that the conductor is always in a full immersion state when penetrating through the inner shell, and the design eliminates the fluid direction conflict of the traditional upper and lower painting pipes; it is ensured that the surface of the conductor is evenly wrapped by paint liquid by 360 degrees, a stable paint liquid layer is formed through overflowing, and coating defects caused by external pressure fluctuation are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of enameled wire production, and more particularly to a paint coating device for the surface of enameled aluminum wire. Background Art

[0002] After the aluminum wire is pretreated, insulating paint is provided to the surface of the aluminum wire through a die, so that an insulating paint layer is formed on the surface of the aluminum wire. In order to ensure the uniformity of the paint film on the surface of the aluminum wire, spray heads for providing insulating paint liquid are usually arranged above and below the aluminum wire. For example, a double spraying paint system for an enameling machine proposed in the publication number CN113130145A and a paint coating device for enamelled wire production proposed in CN110211746A form two sprays through the spray heads arranged on the upper and lower sides of the aluminum wire. However, this method of supplementing the paint liquid by upper spraying has high requirements for the uniformity of the paint liquid supply flow rate, which directly affects the uniformity of the paint film on the surface of the aluminum wire, and is also not conducive to reducing the length of the die. Summary of the Invention

[0003] The present invention provides a paint coating device for the surface of enameled aluminum wire, including a first housing, a second housing and a third housing;

[0004] The second housing is arranged in the inner cavity of the first housing. A liquid supply pipe is provided below the second housing, and an immersion coating cavity is formed inside the second housing. The liquid supply channel in the liquid supply pipe is communicated with the immersion coating cavity;

[0005] The third housing is arranged above the first housing. A liquid return cavity is formed inside the third housing. A liquid return hole is provided on the outer wall of the third housing, so that the liquid return cavity is communicated with the inner cavity of the first housing;

[0006] Wherein, a drain pipe is provided at the bottom of the first housing, and the drain channel in the drain pipe is communicated with the inner cavity of the first housing;

[0007] First through holes for the aluminum wire to pass through and out are provided on both side wall surfaces of the first housing. Second through holes for the aluminum wire to pass through and out are provided on both side wall surfaces of the second housing. The second through holes and the first through holes are coaxially arranged.

[0008] Preferably, the diameter of the second through hole is larger than the diameter of the first through hole.

[0009] Preferably, the diameter of the second through hole is 1.5 to 2.0 times the diameter of the first through hole.

[0010] Preferably, the diameter of the aluminum wire defining the target paint layer thickness is d1, the diameter of the first through hole is d2, and the thickness of the target paint layer is h1. Wherein, d2 - d1 / 2 = 1.5h1 to 2h1.

[0011] Preferably, the inner wall of the first through hole along the direction in which the aluminum wire passes through is provided with a recess, and the depth of the recess is greater than 2h1.

[0012] Preferably, the cord between the liquid return cavity and the liquid supply channel intersects with the aluminum wire passing through the second through hole.

[0013] Preferably, the liquid return hole is provided on the outer wall of the third housing on the side where the aluminum wire penetrates.

[0014] Preferably, the cross-sectional dimension of the liquid return hole is smaller than the cross-sectional dimension of the liquid supply channel.

[0015] Preferably, the drain pipe is provided on the side of the supply pipe where the aluminum wire penetrates.

[0016] Preferably, the first housing and the second housing are configured as hollow cylindrical structures.

[0017] Compared with the prior art, the advantages of the present invention are as follows:

[0018] In the present application, the liquid supply pipe continuously supplies liquid from the bottom upwards to the immersion coating cavity in the second housing, and the paint liquid overflows from the third housing located above the second housing to form a constant liquid level, so that the conductor is always in a fully immersed state when passing through the inner housing. This design eliminates the fluid direction conflict of the traditional upper and lower paint pipes, ensures that the surface of the conductor is evenly wrapped by the paint liquid 360°, and forms a stable paint liquid layer through overflow, avoiding coating defects caused by external pressure fluctuations.

[0019] In the present application, through gradient paint scraping and full-overflow immersion coating, the target thickness can be achieved in a single coating, reducing the number of baking and curing times and lowering energy consumption, while the traditional process requires multiple coatings to be superimposed; at the same time, the full-immersion coating reduces the mixing of air, and combined with the uniform extrusion of gradient paint scraping, effectively eliminates bubbles and pinholes in the paint layer, improving the insulation reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings are not intended to be drawn to scale. In the drawings, each identical or approximately identical component shown in each figure may be denoted by the same reference numeral. For clarity, not every component is labeled in each figure. Now, embodiments of various aspects of the present invention will be described by way of example and with reference to the drawings, wherein:

[0021] Figure 1 is a schematic structural view of the surface coating structure for an enameled wire shown in the present invention;

[0022] Figure 2 is a schematic cross-sectional view of the surface coating structure for an enameled wire shown in the present invention;

[0023] Figure 3It is a schematic diagram showing that the paint liquid fills the immersion coating cavity as shown in the present invention;

[0024] Figure 4 It is a schematic diagram showing that the paint liquid overflows from the immersion coating cavity and returns to the liquid as shown in the present invention. Detailed implementation manners

[0025] In order to better understand the technical content of the present invention, specific embodiments are hereby given and described in conjunction with the accompanying drawings as follows.

[0026] Combined with Figure 1 and Figure 2 As shown, the present invention provides a paint coating device for the surface of enameled aluminum wire, including a first housing 100, a second housing 200, and a third housing 300.

[0027] Among them, the second housing 200 is arranged in the inner cavity of the first housing 100. A liquid supply pipe 210 is provided below the second housing 200, and an immersion coating cavity 201 is formed inside the second housing 200.

[0028] Optionally, the first housing 100 and the second housing 200 are configured as hollow cylindrical structures.

[0029] First through holes 104 for the aluminum wire to penetrate into and out of are provided on both side wall surfaces of the first housing 100. Second through holes 202 for the aluminum wire to penetrate into and out of are provided on both side wall surfaces of the second housing 200. The second through holes 202 and the first through holes 104 are coaxially arranged.

[0030] Preferably, the cord between the liquid return cavity 301 and the liquid supply channel 211 intersects with the aluminum wire passing through the second through hole 202.

[0031] In this way, the aluminum wire can enter the second through hole 202 on the right side of the second housing 200 from the first through hole 104 on the right side of the first housing 100, and thus enter the immersion coating cavity 201. Then, it enters between the second housing 200 and the first housing 100 through the second through hole 202 on the left side of the second housing 200, and finally passes through the first through hole 104 on the left side of the first housing 100 and exits from the entire paint coating structure.

[0032] Furthermore, the liquid supply channel 211 in the liquid supply pipe 210 is communicated with the immersion coating cavity 201.

[0033] In this way, the paint liquid can be supplied to the immersion coating cavity 201 through the liquid supply pipe 210. When the aluminum wire passes through the second through hole 202 and the first through hole 104 at a predetermined speed, the aluminum wire is coated with the paint liquid in the immersion coating cavity 201, and the paint liquid attached to the surface of the conductor is scraped twice through the second through hole 202 and the first through hole 104 passed by the conductor in sequence to ensure that the thickness of the paint liquid attached to the surface of the conductor meets the requirements.

[0034] Furthermore, the third housing 300 is disposed above the first housing 100. A liquid return cavity 301 is formed inside the third housing 300, and a liquid return hole 302 is provided on the outer wall of the third housing 300 to communicate the liquid return cavity 301 with the cavity inside the first housing 100.

[0035] Wherein, a drain pipe 110 is provided at the bottom of the first housing 100, and a drain passage 111 in the drain pipe 110 is communicated with the cavity inside the first housing 100.

[0036] In this way, after the paint liquid enters the immersion coating cavity 201, continuous liquid supply through the liquid supply passage 211 causes the paint liquid to enter the liquid return cavity 301. Further, due to the liquid supply pressure, the excess paint liquid in the immersion coating cavity 201 overflows through two channels, namely the liquid return hole 302 and the second through hole 202, and is discharged through the drain pipe 110.

[0037] Optionally, the liquid return hole 302 is provided on the outer wall of the third housing 300 on the side where the aluminum wire penetrates. The drain pipe 110 is provided on the side of the liquid supply pipe 210 where the aluminum wire penetrates.

[0038] Furthermore, the paint liquid overflowing from the second through hole 202 on the left side of the immersion coating cavity 201 enters the first return area 101, and the paint liquid flowing out from the liquid return hole 302 enters the second return area 102, and both enter the confluence area 103 at the entrance of the drain passage 111.

[0039] In this way, there are two flow paths of the paint liquid in the painting structure. The first path is: liquid supply passage 211 - immersion coating cavity 201 - liquid return cavity 301 - liquid return hole 302 - second return area 102 - confluence area 103 - drain passage 111; The second path is: liquid supply passage 211 - immersion coating cavity 201 - second through hole 202 - confluence area 103 - drain passage 111.

[0040] Optionally, the cross-sectional dimension of the liquid return hole 302 is smaller than the cross-sectional dimension of the liquid supply passage 211.

[0041] In this way, it can be ensured that the immersion coating cavity 201 is in a slightly positive pressure state.

[0042] As described above, the paint liquid is injected into the immersion coating cavity 201 through the liquid supply channel 211, and a slightly positive pressure is maintained in the immersion coating cavity 201, so that the paint liquid in the immersion coating cavity 201 completely covers the surface of the conductor entering the immersion coating cavity 201. Since the paint liquid in the immersion coating cavity 201 always fills up to the liquid return cavity 301, a relatively constant liquid level is maintained in the immersion coating cavity 201, especially higher than the liquid level of the aluminum wire. Even if the flow rate of the paint liquid injected through the liquid supply channel 211 is uneven, the conductor can still be kept in a soaked state all the time, especially a 360-degree uniform wrapping. This method can avoid the adverse effects on the quality of the paint coating layer caused by the presence of air bubbles in the paint liquid, such as local lack of paint or accumulation caused by external pressure fluctuations.

[0043] It should be understood that the above-mentioned immersion coating cavity 201 provides all-round immersion for the conductor. When the aluminum wire passes through at high speed, it can ensure that any part of the aluminum wire is covered by the filled paint liquid. Compared with the prior art method of first supplying liquid from the bottom and then spraying from the upper part, this coating method can ensure a better surface coating effect, has a low requirement for the flow stability of the paint liquid, and a low requirement for the air bubble content in the paint liquid.

[0044] Furthermore, in order to optimize the paint liquid thickness after the aluminum wire passes through the immersion coating cavity 201, the diameter of the second through hole 202 is larger than the diameter of the first through hole 104. And the diameter of the second through hole 202 is 1.5 - 2.0 times the diameter of the first through hole 104.

[0045] In this way, after the aluminum wire passes through the immersion coating cavity 201, the paint liquid adheres to its surface. By passing through the second through hole 202 and the first through hole 104 in sequence, the paint liquid thickness on the surface of the aluminum wire can be scraped off in a stepped manner. The excess paint liquid can be scraped off first to form a preliminary uniform coating, and then the super-thick part of the paint liquid can be scraped off again to accurately control the thickness of the final coating.

[0046] Compared with the traditional method relying on fluid dynamic regulation, this method has more stable thickness control, and is especially suitable for scenarios of ultra-thin coatings or coatings requiring high precision.

[0047] When the aluminum wire continuously passes through the first through hole 104 and exits the first housing 100, in order to avoid uncontrollable scraping of the paint liquid on the surface of the aluminum wire after the inner wall of the first through hole 104 adheres to the paint liquid, define the diameter of the aluminum wire with the target paint layer thickness as d1, the diameter of the first through hole 104 as d2, and the thickness of the target paint layer as h1. Among them, d2 - d1 / 2 = 1.5h1 - 2h1.

[0048] In this way, the thickness of the paint layer on the surface of the final aluminum wire is limited by the first through hole 104 slightly larger than the diameter of the target paint layer, and the diameter of the first through hole 104 can be selected according to the speed of the aluminum wire, the viscosity of the paint liquid, etc.

[0049] In a preferred embodiment, a recessed portion 105 is provided on the inner wall of the first through-hole 104 along the direction in which the aluminum wire passes through, and the depth of the recessed portion 105 is greater than 2h1.

[0050] In this way, by retaining a certain amount of paint liquid in the recessed portion 105, the paint liquid can be kept flowing at the first through-hole 104, that is, the paint liquid thickness on the outer wall of the aluminum wire is more consistent.

[0051] Combined with the above embodiments, in the present application, the liquid supply pipe continuously supplies liquid from the bottom upwards to the immersion coating cavity in the second housing, and the paint liquid overflows from the third housing located above the second housing to form a constant liquid level, so that the conductor is always in a fully immersed state when passing through the inner housing. This design eliminates the fluid direction conflict of the traditional upper and lower paint pipes, ensures that the surface of the conductor is evenly wrapped by the paint liquid 360°, and forms a stable paint liquid layer through overflow, avoiding coating defects caused by external pressure fluctuations.

[0052] In the present application, through gradient paint scraping and overflow immersion coating, the target thickness can be achieved in a single coating, reducing the number of baking and curing times and reducing energy consumption, while the traditional process requires multiple coatings to be superimposed; at the same time, the full immersion coating reduces the air mixing, and combined with the uniform extrusion of the gradient paint scraping, effectively eliminates the bubbles and pinholes in the paint layer, improving the insulation reliability.

Claims

1. A paint coating device for the surface of enameled aluminum wire, characterized in that, It includes a first housing (100), a second housing (200) and a third housing (300); The second housing (200) is arranged in the inner cavity of the first housing (100). A liquid supply pipe (210) is provided below the second housing (200). An immersion coating cavity (201) is formed inside the second housing (200). A liquid supply channel (211) in the liquid supply pipe (210) is communicated with the immersion coating cavity (201); The third housing (300) is arranged above the first housing (100). A liquid return cavity (301) is formed inside the third housing (300). A liquid return hole (302) is provided on the outer wall of the third housing (300) to communicate the liquid return cavity (301) with the cavity inside the first housing (100); Wherein, a drain pipe (110) is provided at the bottom of the first housing (100). A drain channel in the drain pipe (110) is communicated with the cavity inside the first housing (100); First through holes (104) for aluminum wires to penetrate in and out are provided on both side wall surfaces of the first housing (100). Second through holes (202) for aluminum wires to penetrate in and out are provided on both side wall surfaces of the second housing (200). The second through holes (202) and the first through holes (104) are coaxially arranged.

2. The enamelled aluminum wire surface painting device according to claim 1, characterized in that, The diameter of the second through hole (202) is larger than the diameter of the first through hole (104).

3. The enamelled aluminum wire surface painting device according to claim 1, characterized in that, The diameter of the second through hole (202) is 1.5 to 2.0 times the diameter of the first through hole (104).

4. A paint coating device for the surface of enameled aluminum wire according to claim 1, characterized in that, Define the diameter of the aluminum wire for the target paint layer thickness as d1, the diameter of the first through hole (104) as d2, and the thickness of the target paint layer as h1. Wherein, (d2 - d1) / 2 = 1.5h1 to 2h1.

5. The surface painting device for enameled aluminum wire according to claim 1, characterized in that, A recessed portion (105) is provided on the inner wall of the first through hole (104) along the direction in which the aluminum wire penetrates out. The depth of the recessed portion (105) is greater than 2h1.

6. The enamelled aluminum wire surface painting device according to claim 1, characterized in that The cord between the liquid return cavity (301) and the liquid supply channel (211) intersects with the aluminum wire passing through the second through hole (202).

7. A paint coating device for the surface of enameled aluminum wire according to claim 1, characterized in that, The liquid return hole (302) is provided on the outer wall of the third housing (300) on the side where the aluminum wire penetrates in.

8. The enamelled aluminum wire surface painting device according to claim 1, characterized in that, The cross-sectional dimension of the liquid return hole (302) is smaller than the cross-sectional dimension of the liquid supply channel (211).

9. The surface painting device for enameled aluminum wire according to claim 1, characterized in that, The drain pipe (110) is provided on the side of the liquid supply pipe (210) where the aluminum wire penetrates in.

10. The surface painting device for enameled aluminum wire according to claim 1, wherein, The first housing (100) and the second housing (200) are configured as hollow cylindrical structures.

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