WO2015096620A1

WO2015096620A1 - Enamelling machine suitable for photo-curing insulating varnish

Info

Publication number: WO2015096620A1
Application number: PCT/CN2014/093441
Authority: WO
Inventors: 马素德; 张小兰; 赵珉; 兰天佑; 刘勇斌
Original assignee: 四川优特光电科技有限公司
Priority date: 2013-12-27
Filing date: 2014-12-10
Publication date: 2015-07-02
Also published as: CN103714917A

Abstract

Disclosed is an enamelling machine suitable for photo-curing insulating varnish, comprising a light-radiating unit and an optional heat-induced cross-linking unit for further increasing product performance. The light-radiating unit and the heat-induced cross-linking unit are connected together using welding or a bolt to form a main machine. The main machine is divided into a coating area (10), a levelling area (11), a curing area (12), a baking area (13) and a cooling area (14). The processes of curing photo-cured type insulating varnish and coating and preparing enamelled wire can be achieved by the action of this type of light-radiating insulating varnish enamelling machine, and the performance of the product obtained reaches the quality index of conventional enamelled wire produced with insulating varnish.

Description

An enamelling machine suitable for light curing insulating varnish

Technical field

The invention belongs to the field of manufacture of enameled wires in electrical insulating materials. Specifically, it belongs to various specifications (various wire diameters, various heat resistance grades, various paint film thicknesses, various voltage grades), such as enamelled round copper wire, lacquered flat copper wire, lacquered round aluminum wire, and lacquered flat aluminum wire. And equipment used in the manufacture of composite enameled wires made of two or more metals as conductor materials.

Background technique

An enameled wire is a conductive metal wire with an insulating layer that is used to wind coils or windings of electrical products. The insulating varnish currently available on the market for the preparation of enameled wires is mainly solvent-based lacquer. Its solid content is only about 33% or even lower, and VOC (volatile organic substances, mainly a series of organic solvents in such products) is as high as nearly 70%. In order to adapt to the performance characteristics of such insulating varnishes, the existing enamel wires are generally "coated with bare wires (that is, conductor materials, commonly used copper, aluminum and alloys), after annealing and softening, after repeated cycles on the enamelling machine Painted and baked.

UV curing (often referred to as UV curing) technology is an emerging technology for the preparation of environmentally friendly paints. The coating film can be dried and cured in a few seconds to several tens of seconds for the special resin and diluent system by the irradiation of ultraviolet light. Since the curing time is extremely short and the paint associated with it is photoreactive, the VOC content in the paint can be reduced to near zero by this technique. Therefore, UV curing technology is an environmentally friendly and efficient new paint coating method. If the UV curing technology can be applied to the manufacturing field of the enameled wire for the ultraviolet active paint, the VOC content during the use of the insulating paint will be greatly reduced, and the manufacturing method of the new environmentally friendly insulating paint can be obtained.

The existing enamelling machine does not have the function of preparing enameled wire in accordance with the performance of near-zero VOC content insulating varnish such as ultraviolet curing, and is cured by ultraviolet light as people's living standards improve and environmental protection requirements are increasingly strict in relevant national laws and regulations. The low VOC and even zero VOC insulating varnish represented by the type is getting more and more attention from manufacturers and users. Therefore, it is very important to develop a enamelling machine suitable for UV curing varnish.

Summary of the invention

In view of the problem that the existing enamelling machine cannot produce an enameled wire for an environmentally friendly (near zero VOC content) type insulating varnish system such as ultraviolet curing, the object of the present invention is to provide an environment-friendly insulation which is specifically suitable for near-zero VOC content such as ultraviolet curing. Paint enamelling machine.

The above object of the present invention is achieved by the following technical solution: an enamelling machine suitable for a light-curing insulating varnish, comprising a light irradiation unit and an optional thermal crosslinking unit.

In the present invention, the function of the light irradiation unit is to provide a certain power of ultraviolet light irradiation for photocuring of the insulating varnish. The light irradiation unit comprises a frame, an ultraviolet lamp 6, and a mirror panel component; wherein the frame is a structural frame of the light irradiation unit The frame is used to determine the structure of the unit and/or to support other components of the unit; the frame may be constructed of a metallic material or other suitable non-metallic material, preferably stainless steel.

The ultraviolet lamp 6 is mounted on the frame to provide a total of 0.5 to 10 kW of ultraviolet light irradiation; the ultraviolet lamp 6 can be installed in a fixed manner or can be adjusted in a ring shape or a relative orientation. A mirror panel for preventing light from being exposed outside the frame is preferably a stainless steel mirror panel. The steel plate optionally has an upward louvered slit or round hole for heat dissipation.

In the present invention, the performance requirements of the enameled wire are special in some fields, and can be realized by further adding a thermal crosslinking unit after the light irradiation unit to further improve the performance of the insulating paint film. The function of the thermal crosslinking unit is to provide a certain temperature and heat for thermal crosslinking of the insulating paint, so as to further improve the flexibility of the paint film, the adhesion of the paint film to the substrate, and the softening breakdown of the paint film. The thermal crosslinking unit comprises a frame, a heating rod 9, a casing and an insulating layer 17; wherein the frame is a structural frame of the thermal crosslinking unit for determining the structure of the unit and/or supporting other components of the unit; The frame may be made of a metal material or other suitable non-metallic materials, preferably made of stainless steel.

The heating rods 9 are arranged on the frame and distributed on both sides of the area where the enamel wire runs, and the number and arrangement density of the heating bars 9 can be adjusted according to the required temperature. The frame is wrapped with an organic shell, preferably made of stainless steel. The outer layer of the casing is provided with an insulating layer 17, and the insulating layer is preferably made of a thermal insulating material such as magnesium silicate or asbestos or rock wool. Preferably, the thermal crosslinking unit is further provided with a temperature measuring point 8 for detecting the temperature.

In the present invention, the thermal crosslinking unit can provide a temperature gradient required for the insulating varnish to complete thermal crosslinking, and the temperature gradient is a uniformly varying gradient from low temperature to high temperature. The low temperature end is 120 to 300 ° C, and the high temperature end is 250 to 550 ° C. The temperature gradient has a length of 2 to 10 m.

The light irradiation unit and the thermal crosslinking unit are integrally connected to each other (referred to as a main body), and are welded or bolted. When the control wire is in operation, the light irradiation unit is always located in front of the thermal crosslinking unit, and the entire host is divided into a painting zone 10, a leveling zone 11, a solidification zone 12, a baking zone 13, and a cooling zone 14.

In the present invention, the positioning wheel is respectively installed at the two ends of the main body, and the positioning wheel of each end may be a row with a single wire groove (diameter 10 to 800 mm); or one with multiple wire grooves (diameter 10 to 800 mm) ) or multiple (10 to 800 mm diameter) positioning wheels. The positioning wheel is used for positioning the wire and can be rotated. The material is made of temperature-resistant material such as cast aluminum or ceramic.

In the present invention, the light irradiation unit is also provided with a paint supply device 3 before. The main body of the paint supply device 3 is a felt 20 or a special mold and a paint tank. The felt or special mold is located at the front of the paint tank, and the distance from the front of the light irradiation unit is 200 to 1500 mm. The main body of the paint supply device 3 is a paint tank, which is a long-slotted device with a single-sided inclination. The inclined surface is provided with a plurality of slits and is sealed with an open felt. When the enamelling machine is in operation, the wire 19 enters the paint through the slit on the felt. Slot, finish painting (Figure 2). The thickness of the upper mouth of the paint tank is 20-300mm, and the thickness of the lower mouth is 0-200mm. Width is 100~3000mm, with the main Machine width fit. The paint tank is connected to the external paint storage tank through a pipe, and the circulation of the paint can be realized by the action of the pump. Preferably, the enamelling machine of the present invention is further provided with a lacquering member 15 between the painting zone 10 and the leveling zone 11, and the excess lacquer on the wire 19 is removed by the lacquering component 15.

The felt 20 has a width of 120 to 3200 mm and may be joined by one or more felts. Two opposing felts are fixed in the middle of the splint 21, and the inside of the felt 20 allows the painted wire 19 to pass through. The degree of tightness of the splint 21 fixing felt 20 can be adjusted by means of a bolt or a spring or the like. The function of the felt 20 can also be achieved by a dedicated mold. The mold is made of diamond, gemstone or hard metal alloy, which has holes matching the diameter of the painted wire and is mounted on a bracket that allows the mold to move back and forth and left and right. The schematic diagram of the mold is shown in Figure 3.

The upper part of the main unit is a cooling device for the wire 19, which can be completed by the cold air supplied from the cooling fan 16. The height of the cooling device is 400 to 1500 mm. The main unit and the paint supply mechanism are supported by steel pipes or channel steel or I-beam of sufficient strength. The main line is also provided with a payout opening 4 and a take-up opening 5.

In the present invention, the main structure of the lacquering machine of the photocurable insulating varnish can be set to a vertical type and a horizontal type as needed, wherein in the vertical structure, the wire 19 is controlled by the upper guide wheel 1 and the lower guide wheel 2, when When the wire 19 moves from the bottom to the top, the light irradiation portion is located at a lower portion of the heat crosslinking portion; when the wire 19 moves from the top to the bottom, the light irradiation portion is located at an upper portion of the heat crosslinking portion; that is, the light irradiation portion is always located at the heat. The front of the cross section. In the horizontal structure, when the wire 19 moves from left to right, the light irradiation portion is located on the left side of the heat crosslinking portion; when the wire 19 moves from right to left, the light irradiation portion is located on the right side of the heat crosslinking portion; The irradiated portion is always in front of the thermally crosslinked portion.

The invention has the beneficial effects that the process of curing and painting the new light-curable insulating varnish and preparing the enameled wire can be realized by the action of the light-irradiating enamel coating machine, and the obtained product has the performance of the enameled wire produced by the traditional insulating varnish. Quality Index. If the UV-curable insulating varnish is applied to a circular copper wire with a nominal diameter of 1 mm to form an enameled round copper wire by using the ultraviolet curing type varnish enamelling machine provided by the invention, the indexes are superior to the national standard. . For enameled wire products with an insulating paint film thickness of about 0.04mm (the diameter of the enameled wire is 1.08mm), the normal temperature breakdown voltage can reach 10kV or more, the winding diameter is 1mm without cracking, and the number of pinholes in the continuity of the paint film is zero. Softening breakdown at 240 ° C for 10 min does not breakdown, thermal shock does not crack under 3 times the diameter, the patent leather and copper wire are not separated after the violent pull.

DRAWINGS

Figure 1 is a schematic view showing the structure of a vertical enamelling machine of the present invention.

2 is a schematic view showing the structure of a paint supply device of the present invention.

Figure 3 is a schematic view showing the construction of a special painting mold of the present invention.

In the figure, 1 is the upper guide wheel, 2 is the lower guide wheel, 3 is the paint supply device, 4 is the pay-off port, 5 is the take-up port, 6 is the ultraviolet lamp, 7 is the circulation fan, 8 is the temperature measuring point, 9 is Heating rod, 10 is the painting area, 11 is the leveling area, 12 is the curing area, 13 It is a baking zone, 14 is a cooling zone, 15 is a lacquering component, 16 is a cooling fan, 17 is an insulating layer, 18 is a casing, 19 is a wire, 20 is a felt, and 21 is a splint.

detailed description

Example 1

In the vertical enamelling machine, along the running direction of the wire 19, the entire enamelling machine is divided into a painting zone 10, a leveling zone 11, a curing zone 12, a baking zone 13, and a cooling zone 14. The wire 19 is controlled by the upper guide wheel 1 and the lower guide wheel 2, and is taken into the painting zone 10 in the enamelling machine by the

payout opening

4, 10 in the painting zone, uniformly coated by the felt 20 of the paint supply device and the paint groove. A layer of light-curing insulating varnish is applied; the excess lacquer on the wire 19 is removed by the lacquering member 15. The coated wire 19 enters the leveling zone 11, and after leveling, enters the curing zone 12; in the curing zone 12, the light is irradiated by the ultraviolet lamp 6, the insulating varnish is photocured, and then enters the baking zone 13; in the baking zone In step 13, heat having a temperature gradient is provided by the heating rod 8 for thermal crosslinking of the insulating varnish; after completion of the thermal crosslinking, the wire 19 enters the cooling zone 14, is cooled by the cooling fan 16, and is then discharged through the wire receiving port 5. Charter machine.

Claims

An enamelling machine suitable for a photocurable insulating varnish, comprising a light irradiation unit and an optional thermal crosslinking unit, wherein the light irradiation unit and the thermal crosslinking unit are connected to each other by welding or bolts to form a host; It is divided into painting zone (10), leveling zone (11), solidification zone (12), baking zone (13) and cooling zone (14).
The enamelling machine according to claim 1, wherein the light irradiation unit comprises a frame, an ultraviolet lamp (6), a mirror panel member, the ultraviolet lamp (6) is mounted on the frame, and a mirror panel is disposed outside the frame. The mirror panel is optionally provided with an upward louvered slit or a circular hole.
The enamelling machine according to claim 2, wherein said ultraviolet lamp (6) is fixed or adjustablely mounted in a ring shape or symmetrical.
The enamelling machine according to claim 1 or 2, wherein said thermal crosslinking unit thermal crosslinking unit comprises a frame, a heating rod (9), a casing and a heat insulating layer (17); said heating rod (9) is provided On the frame; the insulation layer (17) is disposed on the outer layer of the casing; the thermal crosslinking unit is further provided with a temperature measurement point (8) for detecting the temperature.
The enamelling machine according to claim 4, wherein said insulating layer (17) is made of a thermal insulating material such as magnesium silicate or asbestos or rock wool.
A enamelling machine according to any one of claims 1 to 5, wherein the frame is made of a metallic material or a non-metallic material, preferably stainless steel.
The enamelling machine according to claim 1, wherein the light irradiation unit is further provided with a paint supply device (3).
The enamelling machine according to claim 7, wherein the main body of the lacquering device (3) is a felt (20) or a special mold and a paint tank; the felt or the special mold is located at the front of the paint tank; the paint tank is a single side The inclined long trough-like device has a plurality of slits on the inclined surface and is sealed with an open felt; two opposite felts are fixed in the middle of the splint (21), and the inside of the felt (20) allows the painted wire 19 to pass through.
The enamelling machine according to claim 1, wherein the main body of the enamelling machine is of a vertical type and a horizontal type.
The enamelling machine according to claim 1, wherein the enamelling machine is further provided with a guide wheel for controlling the wire, a payout opening (4) and a take-up opening (5).