JPS6014452B2 - Enamelled wire manufacturing plant using in-line process - Google Patents

Description

[Detailed Description of the Invention] [Background of the Invention] The present invention provides a wire drawing machine, a bare wire annealing machine, an enameled coating coater, an enameling processing unit, and an enameled wire in order to process the wire coming from the green supply integrated system. The present invention relates to a plant for manufacturing enamelled wire using an in-line process with a winding device.

A plant aimed at such a comprehensive line can be found in British Patent No. 3305032 or the corresponding German Patent Specification No. 2058151.

In the case of this in-line plant, the wire coming from the wire drawer is transferred to the next part of the plant, the enamel treatment system, where the wire is given several coats of enamel paint and then phosphorized. ), the wire passes over guide rollers and passes through a bran restoring unit, ie, a blunting device (where the wire is dampened, ie, normalized, to remove distortion). In view of continuous automated line processing systems, the quality of the lines produced is superior to that of the prior art, production speeds are increased and costs are reduced, among other beneficial effects. Although it is possible to view the in-line process as providing useful effects,
Even so, there are several disadvantages associated with this process, particularly the high power requirements and the undesirable environmental impact of chemicals from the plant.

Suggestions have been made to improve this, particularly in connection with enamel processing systems. Such proposals are more concerned with reducing the power required in this system and sealing the line inlets and outlets. For example, proposals have been made in the past to combust solvent vapors and chemical fission products in an outlet catalytic unit. In addition, such vapors and products are
This occurs when a bare wire heated by a radiation heater is coated with dove paint. When such combustion takes place, the heated air produced can also be used to dry and cure the paint coating on the wire. One of the useful effects of catalytic combustion or oxidation is that the energy of the solvent can be used to dry the paint coating and harden it, while eliminating any unwanted chemistry escaping into the environment. Sometimes substances are reduced. However, as the need to reduce power has become increasingly important and the regulations drawn up by national authorities for environmental protection have become stricter and therefore more difficult to comply with, the degree of The proposal cannot be expected to be sufficiently effective.

Moreover, these proposals do not take into account the issue of space occupied by the plant. [Summary of the Invention] It is therefore an object of the present invention to provide a system in which the power or energy required for commonly found plants is significantly reduced and the undesirable effects of chemicals on the environment are reduced as much as possible. The aim is to provide a better structure for the plant that aims to achieve this goal.

Another object of the invention is to enable the plant to be automated so that it is automatically controlled under given conditions once it has been put into operation. Therefore, generally speaking, no precautions are required by the workers operating the plant. One consequence of this is that, if desired, maintenance work can be carried out during the day shift, while line speeds are increased and manufacturing costs are reduced. To fulfill this and other objects of the invention, an annealer and an enameling unit for drawn bare wire are located within a common furnace housing so as to constitute a single processing stage, and the furnace housing has a drying room and an adjoining curing room, with a return air passage serving as a circulation air passage for circulating a hot air flow in a single countercurrent state to the moving line by using an air blower. .

In the plant of the invention, the hot air flows through the drying chamber and the curing chamber in the opposite direction to the lines, ie countercurrently to the lines. Because the heat transfer to the wire will take place to a large extent by convection, and because the countercurrent effect occurs very quickly, the solvent coming out of the dove paint will be removed very quickly.
Therefore, conditions for operating the plant at high line speeds are maintained. The circulating air in the plant, i.e. mixed with the solvent, is circulated by the action of a circulating air blower,
It exits to the return air passage right near the line entrance, and is then sent through the return air passage to a location near the line exit. If the plant is designed to flow more than one line, the blower is best designed as a cross-blowing blower. Some of the air within the plant, i.e. circulated, is routed through the waste gas pipe, which is branched from a location downstream of the catalyst and is conveniently joined at the end wall of the common furnace housing, so that the air is subsequently free Unused air flows into the atmosphere and is drawn in from the atmosphere at the line inlet or outlet in the same quantity as the waste gas. In the return air passage, an electrical heating device is provided to heat the furnace and a catalyst is provided to combust the organic solvents present in the plant air. This air is circulated back into the curing and drying chambers so that
The energy of the solvent is utilized for the drying and disassembly process of the dope paint. The high line speed allows a very sufficient amount of solvent to sulfate into the furnace, so that in safe operating conditions the furnace is self-sustaining, ie, without any need for electrical power. The heat obtained in the catalyst for the combustion of the solvent vapors and chemical fission products present in the plant, i.e. in the circulating air, is not only used for the self-operation of the plant, but also for the primary heating.
In the stage it is used to heat the air (which is forced into the plant at the line outlet by gauge pressure) and to create steam (which is used as an inert atmosphere). In the waste gas pipe, a second catalyst is arranged, which reduces the concentration level of undesirable chemicals in the waste gas to such an extent that, in general terms, it does not have an undesirable effect on the environment. be done. In order to reduce the concentration levels of undesirable chemicals that make the plant unhealthy for the workers operating the plant, if the undesirable chemicals flow into the atmosphere at the line inlet and outlet of the furnace housing. Even more useful effects will be produced if each step is carried out with care to eliminate all possibilities.

To do this, the pressure conditions at the line inlet into the furnace are controlled to produce this effect, i.e. to create a suction effect at the line inlet by a circulating air blower located near the inlet. be done. Such a suction effect acts in the suction inlet pipe, so that air from the atmosphere is sucked into the plant. Additionally, at the paint cladding and line inlet, a box is provided which is connected close to the furnace housing and allows any solvent vapor that may be exhausted from the paint cladding to be drawn from the atmosphere and forced into the furnace. This ensures that the air is mixed with the air. Therefore, at this point, no toxic gases escape into the external atmosphere. Furthermore, by using a line cooler located immediately adjacent to the line outlet, as well as a gauge pressure blower and a suction blower,
A pressure difference is created in the line cooler such that at the line outlet it is higher than the pressure inside the curing chamber, so that at this sufficiently heated location, as long as air from the unused atmosphere flows into the curing chamber, Preventing unwanted waste gases from flowing out of the system. Due to the catalytic combustion of hydrocarbons, harmful organic solvents are burned into carbon dioxide and water, these compounds do not have any undesirable effects on humans, while at the same time heat is It is produced in an amount that depends on the calorific value of the hydrocarbon. Further useful developments of the plant of the invention can be found in the dependent claims. In the drawing, a preferred implementation of the invention is schematically illustrated.

FIG. 1 is a schematic diagram of the entire plant.

FIG. 2 is a schematic cross-sectional view through the common furnace housing and annealing unit integral therewith.

[Detailed description of embodiments of the invention]

As seen generally and schematically in FIG.
The plant comprises a wire supply system 1 with two wire bobbins 2 and 3 from which the wire is drawn through the next part of the plant, namely the wire drawer 4.

Having passed over the guide rollers, the drawn-out bare wire 5 passes into the enameling unit 6 in the direction of the arrow. In the furnace housing 7 of this enamel treatment unit 6 there is provided a blunting tool 8 which forms part of this unit 6. In its lower part, a dope paint container 9 and a control system 10 are provided. The wire 5 fed from the wire drawer 4 is fed through the dawn blunter 8 in the upper part of the furnace housing 7, is redirected at its rear end and is fed back to the upstream end of the furnace housing 7, at which point. , the paint coater 1 is guided by guide rollers 11.
2 into the enameling unit 6 from the wire inlet, and when the wire emerges from the wire cooler 13 it is fed back again through guide rollers. This operation is repeated many times until the coating on the wire is sufficiently thick. The wire is subsequently wound up by a bobbin of the winding device 14. More details of this part of the plant are shown in FIG. Here a furnace housing 7 is shown, the lower part of which includes a drying chamber 15, a curing chamber 17 (in which the line-dried paint coating or enamel is baked),
It has a return ventilation path 18. At the left end of the return air passage 18, a blower 19 for plant air is provided. This has the effect of sustaining air circulation in a single circulating co-current as indicated by arrow 2, so that air circulation is maintained within the drying chamber 15 and curing chamber 17 by line 5.
occurs in the opposite direction. Drying room 15 and curing room 1
7 are connected to each other by air channels 21, which are wider towards the drying chamber 15 at the inlet end or inlet side so that the air flow is slower and more constant.

The bulkhead 22 between the blower 19 for plant air and the drying chamber 15 is provided with a door 23, which controls the air flow and thus fresh air from the atmosphere coming through the suction inlet pipe 25. be able to. When the plant is about to be put into operation, the air of the plant is heated in the return air passage 18 not only by the heating device of the annealer 8 but also by the catalyst 26, where the solvent generated from the dope paint on the line 5 is heated. Steam and chemical fission products are combusted.

The hot plant air then flows partially into the curing chamber 17 and comes into contact with the wire 5 through a sleeve 27 with a closure. The sleeve 27 is shown schematically in FIG. 2 and has inwardly extending and orthogonally arranged plates 28, such plates 28 being arranged in the form of a labyrinth. A strong current is therefore created in the hot air, which ensures that the action of the air on the wire 5 is increased. A portion of the hot air of the plant flows through the catalyst 26 in the front part of the furnace housing 7 through the outlet pipe 29 into the waste gas pipe 30, where it is introduced into the second catalyst 3.
2 is arranged, this air flows to the waste air blower 33,
From here it flows out into the free atmosphere.

Not only the return air duct 18, but also the outlet pipe 29 and the waste gas pipe 30 have a gun blunt tube 34 extending through them in the flywheel direction, and the wire 5 is fed through the annealing tube 34. The inert atmosphere generated by the steam generator 35 (heated by the waste gas pipe 301) ensures that the steam used as the inert atmosphere flows through the steam line 36 into the inlet end of the blunt tube 34. This is to make it possible to do this. Towards the right side of the waste gas pipe 30 a wire cooler 37 is provided, in which the wire 5, which has been dulled to remove strains, is cooled before passing through various guide rollers and is cooled before passing through the paint coater 12. and after being moved through the suction inlet pipe 25, it enters the drying chamber 1
Sent within 5.

The paint coater 12 is arranged in a box 16 which has in its lower part an inlet port 24 through which the line 5 can be fed into the box 16.

The purpose of this box 16 is to ensure that any solvent vapor coming from the paint coater 12 is well mixed with fresh air from the atmosphere and that the resulting mixture is drawn into the drying chamber 15 through the suction inlet pipe 25. The objective is to ensure that the Therefore, noxious vapors cannot escape into the atmosphere at this location. The line 5 is connected from the curing chamber 17 to the line outlet 3 immediately adjacent to the line cooler 13.
Sent up to 8.

The line cooler 13 includes a gauge pressure blower 39 and a suction blower 4.
0, these are used to adjust the pressure difference in the line cooler 13 so that at the line outlet 38 a gauge pressure is generated in the line cooler 13 and in addition atmospheric air is drawn into the line cooler 17 into the curing chamber 17. It can be taken in through outlet 38. This prevents any unwanted organic chemicals from flowing into the free atmosphere. The air conveyed under pressure through the line outlet 38 into the curing chamber 17 is subheated by a heat exchanger 41 which is heated by the hot waste gas coming from the waste gas line 31 through the line 42. be done.

In order to control the waste gas, a control door 43 is arranged in the waste gas pipe 30 and finally at the pipe connection of the suction blower 40 a further door 45 is provided, by means of which the gauge pressure ratio in the line cooler 13 is and thus the amount of air flowing at the line outlet 38 from the atmosphere to the furnace can be controlled. Although in the schematic FIG. 2 only a system for guiding one line 5 is shown,
It is of course possible to arrange and run many lines so that they move in parallel through the plant.

Therefore, two or more phosphorous blunt tubes 34 may be arranged side by side in the return ventilation path 18. The functions of the plant of this invention will all be made clear from the description given up to this point. The line 5 drawn by the line drawer across the brush line from the line supply system with the line bobbin is
It is led into the Akatsuki Hinakan 34 which is being discussed. Steam as an inert atmosphere to prevent oxidation of the surface of the wire 5 is sent into the race hammer tube 34. After late dulling is completed, wire 5 is cooled in wire cooler 37. The line cooler 37 generally consists of a cooling tube into which water is pumped in a direction opposite to the direction of the line 5. When the wire 5 emerges from the wire cooler 37, any water still remaining on the wire 5 is removed by the blast of air, so that the wire 5 is sent dry over the next guide roller. The line 5 is coated with enamel dope paint in a paint coater 12, this dope paint being applied in an amount greater than the required dope paint, and any unnecessary dope paint in excess of the required amount increasing the desired dope thickness. removed by the nozzle to obtain.

Additionally, to create this uniform coating, a speed control system is used to apply the desired amount of dope paint by using a metering pump and a felt (over which the line is moved). be able to. The nozzles used in this connection have metal or diamond cores, with diamond cores (dies) being preferred because of their longer life. The high line speed necessarily means that the dope paint can only be applied in thin coats so that it can dry more quickly, and moreover, a fairly large number of repeated coats of paint can cause the line to become thinner. It is designed for more than one paint coating to be applied, as this results in a more uniform enamel insulation around. Furthermore, if the wire breaks, the supply of dope paint is automatically cut off. The line with the dried dope paint is passed through an air channel 21 in countercurrent to this to a curing chamber 17.
In , the dried dope paint is dawned by the extremely hot plant air in such a way that the watermarked or perforated sleeve 27 ensures that the extremely strong effect of the plant air is exerted on the line. Ru. Upon exiting through the line outlet 38, the line is taken into the next line cooler 13 and, after being routed through the plant a number of times, is transferred from the line cooler 13 to the next part of the plant. , ie to a winding device 14 for the enamelled wire. The air circulation system can also be adjusted to match dawning requirements by using variable speed blowers 19 and doors 23 for plant air.

After the heating operation is completed, automatic control of the drying and mothing temperatures is carried out by the control door 43 with the help of temperature sensors such as thermoelectric elements, so that the plant is self-sustaining. In other words, it is not dependent on the supply of energy or power from outside.

Such thermoelectric elements are placed at locations 46 and 47, for example. By adjusting the control door 43, the speed of the air is controlled, such as the speed at the suction inlet pipe 25 and line outlet 38 in the furnace housing 7, where air is drawn in from the atmosphere or is a waste air blower 33 or a heat exchanger 41
and into the atmosphere. [Effects of the Invention] As described above, according to the present invention, the required power or energy is significantly reduced, the undesirable impact of chemical substances on the environment is reduced as much as possible, and the High quality line processing is possible.

That is, the hot air in the plant flows countercurrently to the lines from the curing chamber to the drying chamber, so that the solvent coming out of the paint is removed very quickly.

The drying chamber and the curing chamber are connected to each other by an air channel, and the air channel is wider on the inlet side toward the drying chamber, so that the flow of hot air is more constant in the drying chamber. . This prevents only the surface of the paint applied to the lines from drying rapidly, resulting in uneven drying, and makes it possible to obtain a high-quality paint coating with excellent insulation properties. However, when viewed in the direction of line progression, in the curing chamber following this drying chamber, a sleeve with holes is provided, and a labyrinth-like plate is formed in this sleeve, so that a strong fly flow is hot. It occurs in the air and has a higher hardening effect. Additionally, a line cooler located adjacent to the line outlet from the furnace housing and directly connected to the sleeve is provided with a gauge pressure blower and a suction blower forming part of the line cooler. Gauge pressure blowers and suction blowers create a pressure difference within the line cooler such that a controlled excess amount of air can be forced into the furnace housing at the line outlet.

Therefore, outside air will be drawn into the curing chamber from the line outlet via the line cooler, thus preventing any unwanted waste gases from flowing into the atmosphere.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of the entire plant. FIG. 2 is a schematic cross-sectional view through the common furnace housing and annealing unit integral therewith. In the figure, 1 is a wire supply system, 4 is a wire drawer, 5 is a wire, 6 is an enamel treatment unit, 7 is a furnace housing, 8 is a duller, 12 is a paint coater, 13 is a general cooler, and 14 is a winder. Equipment, 15 is a drying room, 16 is a box, 17 is a curing room, 18 is a ventilation passage, 19 is a blower, 21 is an air passage, 23 is a door, 24 is an inlet closing, 25 is a suction inlet pipe, 26 is a catalyst, 27 is a sleeve, 28 is a plate, 29 is an outlet pipe, 30 is a waste gas pipe, 34 is an annealing tube, 35 is a steam generator, 36 is a steam line, 38 is a line outlet, 39 is a gauge pressure feeding side machine, 4
0 is a suction blower, 41 is a heat exchanger, and 43 is a control door. Fig. IFi9.2

Claims (1)

[Claims] 1. Enameling using an in-line process comprising, in sequence, a wire drawing machine, a bare wire annealing machine, an enameling coater, an enameling treatment unit and an enameled wire winding device to process the wire coming from the wire feeding system. A plant for manufacturing wire, wherein the bare wire annealer is arranged in a common furnace housing so as to constitute a single processing stage together with the enameling unit, further comprising: A drying chamber, a curing chamber connected to the drying chamber by an air passage, and a return air passage are formed, and in the furnace housing, a flow of hot air flows countercurrently to the line. circulated by a blower forming a single circulation path, the annealing device is positioned within the return air passage, and on the downstream side of the return air passage,
An outlet pipe connecting a waste gas pipe is connected to the furnace housing, and in the return air passage, the plant includes at least one annealing tube extending longitudinally through the return air passage and through the waste gas pipe; a plant for producing enamelled wire using an in-line process, having a sleeve with an opening in the curing chamber of the furnace housing; This sleeve has an inwardly extending labyrinth-like plate, through which the painted line is moved, said sleeve being a mixing point or located between a curing chamber of a furnace housing and a wire outlet from the furnace housing, the platen further comprising a wire cooling located adjacent to the wire outlet from the furnace housing and directly connected to the sleeve. and a gauge pressure blower and a suction blower forming part of the line cooler, such gauge pressure blowers and suction blowers such that a controlled excess amount of air can be forced into the furnace housing at the line outlet. furthermore, the air passage connecting the drying chamber and the curing chamber with each other is wider on the inlet side towards the drying chamber; A plant characterized by: 2. In the connecting part of the line outlet in the line cooler,
2. Plant according to claim 1, characterized in that a heat exchanger is provided for preheating the air under pressure leading into the furnace housing. 3. A steam generator heated by the waste gas pipe; and a steam line of the steam generator, such steam line being coupled to the annealing tube for passing steam into the annealing tube. Plants listed in Section. 4. Plant according to claim 1, having a catalyst for burning off any solvent still present in the waste gas pipe. 5. The plant of claim 1, wherein the paint coater is located in a box for removing solvent vapors produced by the paint coater. 6. Plant according to claim 1, having an air controller by means of which the air inlet and outlet paths are controlled in order to keep the drying and curing temperatures at a constant level. 7. A plant according to claim 6, wherein the air controller takes the form of a mechanically operated door. 8. The plant according to claim 6 or 7, comprising a temperature sensor for controlling the temperature of the door. 9. The plant of claim 8, wherein the temperature sensor is located in a drying room and a curing room. 10. The plant of claim 8, wherein the temperature sensor takes the form of a thermoelectric element.