JPH0317549B2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to an apparatus for producing colored coated iron wire.

(Prior art) As an apparatus for obtaining colored painted iron wire, there is a device in which a heating furnace is installed above a painting tank, and the iron wire is pulled, dipped in the paint in the painting tank, and then sent vertically upward through the heating furnace. . This vertical feeding of the iron wire is to form a perfectly circular and uniform coating film on the surface of the iron wire by making the flow direction of the paint attached to the iron wire vertically downward.After the iron wire passes through the heating furnace, The turnwheel above it is suspended and wound around the drum.

In such conventional technology, the iron wire is heated to about 200°C to bake the coating before it passes through the heating furnace, and then cooled to about 100°C before it comes into contact with the turnwheel above the heating furnace. It is necessary to cure the coating film so that it does not get scratched when the turnwheel is hung. However, conventionally, an air cooling method was used to cool the paint film, and the
The problem is that it takes about 100 seconds and it is difficult to increase the line speed of the iron wire coating process. In other words, when trying to increase line speed,
It would be possible to increase the distance from the heating furnace to the turnwheel, but as a practical matter, the turnwheel would need to be positioned very high, which is unreasonable. Therefore,
Generally, iron wire is colored by slowing down the line speed mentioned above, but the heating time of the coating film in the heating furnace becomes longer, which can lead to discoloration and burnout due to heating, and the condition of the coating film. In some cases, cooling and curing may be insufficient, resulting in scratches from the turnwheel and a decrease in the roundness and smoothness of the coating film. For example, when galvanizing is to be performed as a pretreatment for the above-mentioned iron wire, the line speed for this galvanizing process can be approximately 5 to 40 m/min, but the line speed for the above-mentioned painting process is 1~5m/
Since the galvanizing process and painting process are performed on a continuous line, it becomes necessary to significantly slow down the galvanizing process speed, and in the end both processes are performed on separate lines. This is the actual situation.

(Problem to be Solved by the Invention) An object of the present invention is to rapidly cool a high-temperature colored coated iron wire that is fed vertically through a heating furnace while being fed vertically without causing problems such as deterioration of the coating film properties. The purpose of the present invention is to increase the line speed in the coating treatment of iron wire, to lower the height of iron wire treatment equipment, and to prevent high-temperature atmospheric gas from deteriorating the working environment.

(Means for Solving the Problems) In order to solve these problems, the present invention focuses on the point that the object is a steel wire that is fed vertically upward, and the present invention has a method of attaching a steel wire that is fed vertically to a position above a heating furnace. On the other hand, by installing a cooling liquid nozzle that spouts cooling liquid, it is possible to rapidly cool the iron wire, and by forming an air curtain above the heating furnace, it is possible to prevent the high-temperature atmospheric gas of the heating furnace from flowing upward. It is intended to do so.

In other words, the specific means for this purpose are: a coating tank for storing paint; a traction means for pulling vertically upward the iron wire immersed in the paint in the coating tank; A heating furnace that has openings in the upper and lower walls through which the iron wire to be fed passes through and bakes the coating film on the iron wire; an air blowing nozzle that blows into the heating furnace through the opening; and a cooling liquid nozzle that is disposed above the air blowing nozzle and that blows out cooling liquid to the vertically fed iron wire. This is a manufacturing equipment for colored painted iron wire.

(Function) In the above-mentioned apparatus for producing colored coated iron wire, the paint adhering to the iron wire in the coating tank is baked in a heating furnace while being fed vertically into a perfect circle and having a uniform thickness. The coating film is rapidly cooled and hardened by the cooling liquid spouted from the cooling liquid nozzle above.

In this case, the object to be cooled by jetting the coolant is the iron wire, that is, the wire rod, and unlike plate materials, the entire amount of the coolant from the nozzle does not come into contact with the wire, but only a portion of the coolant comes into contact with the wire, and the Most of the liquid passes between the wires and escapes to the other side, and since the wire itself is hot, there is a limit to the amount of liquid that can adhere to the wire, and the coolant that adheres to the wire quickly evaporates and cools down. Basically, liquid does not flow down the wire.

Furthermore, since the wire rod itself is sent vertically upward, even if a situation were to occur where the coolant accidentally flows down the wire rod, the amount of liquid adhering to the wire rod itself is small and the flow rate is slow. This only flows down relative to the wire rod, and there is no actual flow of the coolant. Therefore, the coolant falls into the heating furnace and the resulting coating is caused by the coolant adhering to the uncured coating film. There is no problem of deterioration of film properties or of cooling liquid falling into the coating tank.

As mentioned above, by allowing the coating film to be rapidly cooled and cured using the cooling liquid above the heating furnace, the coating film may be scratched by the upper turn wheel, and the roundness or smoothness may be reduced. It becomes possible to increase the line speed or shorten the vertical feed length of the iron wire for coating film cooling without causing any problems.

The fact that the line speed can be increased means that even if the iron wire is subjected to zinc plating treatment at a high line speed before being painted, this zinc plating treatment and the above-mentioned painting treatment can be performed continuously. It means that it will become like this.

In addition, the fact that the vertical feed length of the iron wire can be shortened means that the vibration (lateral vibration) of the iron wire during vertical feeding can be reduced accordingly, and therefore, it is possible to shorten the vertical feed length of the iron wire. When processing, the distance between adjacent iron wires can be narrowed without damaging the paint film due to contact between adjacent iron wires in a heating furnace, etc., and there is no need to raise the ceiling of the factory. Therefore, it is advantageous in terms of equipment costs.

Then, the air blowing nozzle installed between the heating furnace and the cooling liquid nozzle blows air into the heating furnace through the opening in the upper wall. This will form an air curtain that prevents leakage. This results in
This prevents the thermal influence of the high-temperature atmospheric gas on the cooling of the iron wire, that is, a decrease in the cooling efficiency of the iron wire by the cooling liquid nozzle, and prevents this high-temperature atmospheric gas (including organic solvents that evaporate from the coating film) from decreasing. This prevents deterioration of the surrounding working environment and complication of waste gas treatment in factories.

(Effects of the Invention) Therefore, according to the present invention, since a nozzle for spouting a cooling liquid is provided to the iron wire that is vertically fed above the heating furnace above the coating tank, problems such as deterioration of the coating film properties can be avoided. The iron wire can be rapidly cooled with a cooling liquid and the coating film can be cured without causing any damage.

Therefore, it is possible to increase the line speed for processing iron wire without increasing the vertical feed length of the iron wire, and it is possible to prevent burntness and discoloration due to overheating in conventional heating furnaces, and coating film on turn foil. Scratches and smoothness,
The problem of deterioration in roundness can be solved. Furthermore, even when galvanizing is performed at a high line speed as a pre-treatment, the pre-treatment line and the painting treatment line can be made continuous to improve productivity, and the vertical feed length of the iron wire can be shortened. As a result, the vibration (lateral vibration) of the iron wire in this vertical feeding state is reduced accordingly, and in equipment that processes dozens of iron wires in parallel, it is possible to reduce the vibration (sideways vibration) of the iron wire due to contact between adjacent iron wires in a heating furnace, etc. The distance between the wires can be narrowed without damaging the paint film, making the equipment more compact.

In addition, since the air blowing nozzle prevents the high-temperature atmospheric gas from flowing out of the heating furnace, the iron wire can be cooled by the cooling liquid nozzle without being affected by the heat of the high-temperature atmospheric gas, and the working environment It does not have any negative impact on waste gas treatment in plants or factories.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 shows a colored coated iron wire 1 that has been subjected to zinc plating and chemical conversion treatment, and then has been colored. In this case, the surface of the iron wire material 2 is coated with a zinc coating 3, a phosphate coating 4, and an undercoat A coating film 5 and a top coating film 6 are formed in this order.

FIG. 2 shows a processing line in which zinc plating and color coating are continuously performed using the production apparatus for colored coating according to the present invention.

That is, the iron wire material 2 is the payoff coil 11
The pretreatment process is carried out from the annealing furnace 12 through the water cooling tank 13, pickling tank 14, and water washing tank 15 to the flux tank 16, the zinc plating process in the galvanizing tank 18, the water cooling tank 19, and the chemical treatment process. A chemical conversion treatment process in the treatment tank 20 and the water washing tank 21, a coating treatment process in the coating tank 22, a heat treatment process by vertical feeding in the heating furnace 23, and a vertical feeding using a cooling liquid nozzle described later in the water cooling booth 30. liquid cooling process,
After successively passing through a top turn wheel 37 equipped with a water cooling mechanism and a hot water tank 38, and further successively passing through each process from the painting process to the hot water tank 38, the film passes through a winding machine 39. Winding coil 4
It is rolled up to 0. In this embodiment, several tens of iron wire materials 2 are processed in parallel.

Now, to explain the configuration of each processing apparatus in this embodiment, from the annealing furnace 12 to the washing tank 2 used for the pretreatment, zinc plating treatment, and chemical conversion treatment,
Each device (tank) up to No. 1 is basically arranged so that the iron wire can be fed horizontally through the furnace and each tank in sequence.

Regarding the apparatus used for the above-mentioned painting treatment, heating treatment, and liquid cooling treatment, first, colored paint is stored in the painting tank 22, and the turnwheel 41 is immersed in this colored paint. A squeezing jig 42 is provided directly above the coating tank 22, and above the squeezing jig 42, as shown in FIG. A booth 30 and a top turn wheel 37 are arranged in order from the bottom.

The heating furnace 23 has a height of 7 to 10 m, and has openings 26 and 27 in an upper wall 24 and a lower wall 25 through which iron wires communicate in the vertical direction. Air blow nozzle 4
3 is arranged around the opening 26 of the upper wall 24 of the heating furnace 23 with the jet nozzle 44 facing the inside of the heating furnace 23, and communicates with the heating furnace 23 through an air guide pipe,
A part of the atmospheric gas in the heating furnace 23 is guided through the air guide pipe and blown into the heating furnace 23 again.
The water cooling booth 30 has a height of about 2 m, and has openings 33 and 34 in an upper wall 31 and a lower wall 32 through which the iron wire passes from the heating furnace 23 in the vertical direction. Inside the water cooling booth 30, the plurality of cooling liquid nozzles 35 are vertically spaced apart from each other and are arranged with their spout ports facing the iron wire. In the case of this example, the cooling liquid nozzle 35 is of a spray type that sprays the cooling liquid (water) in the form of mist.

The top turn wheel 37 has a water cooling tank 45 at the bottom.
A water tank 46 is provided directly above the top turn wheel 37 and a water tank 46 for dispensing a cooling liquid onto the top turn wheel 37 and the iron wires suspended therefrom. A hot water tank 38 is placed on the side of the top turn wheel 37.
is provided, and the iron wire passing through the hot water tank 38 is towed to the next painting tank 22 or winding machine 39. In this case, the turn wheel 41, top turn wheel 37, and winding machine 39 provided in the coating tank 22 constitute a pulling means for vertically feeding the iron wire.

Next, the manner in which iron wire is processed by the apparatus of the above embodiment will be specifically explained.

First, in the pretreatment step, the temperature of the annealing furnace 12 is 700 to 800°C, and deposits and the like on the surface of the iron wire material are removed in the pickling tank 14. In addition, washing tank 15
In this step, the acid content adhering to the iron wire material 2 is removed, and in the flux bath 16, the surface of the iron wire material is cleaned using ammonia chloride to facilitate zinc plating.

The zinc plating process is a hot-dip plating process, in which molten zinc is stored in a galvanizing tank 18, and the iron wire material 2 that has undergone the pretreatment process is immersed while being pulled to form a zinc coating 3. . The bath temperature of the galvanizing bath 18 is about 450°C.

The chemical conversion treatment process involves phosphate treatment.
A phosphate aqueous solution is stored in a chemical conversion treatment tank 20, and a phosphate coating 4 is formed on the surface of the zinc coating 3 by immersing it while pulling a zinc-plated iron wire.

The painting process is carried out by immersion in the colored paint stored in the paint tank 22.The iron wire on which the phosphate coating 4 has been formed is wrapped around a turnwheel 41 and pulled vertically upward to remove the phosphate coating. The paint is applied to the surface of 4 and passed through a squeezing jig 42 installed above the coating tank 22, and the excess paint is dropped into the coating tank 22 by the squeezing jig, and an undercoat or topcoat is applied to the desired thickness. Films 5 and 6 are formed.

In the heat treatment process, the coated iron wire formed in the painting process is heated and fed vertically to bake the coated films 5 and 6. It travels vertically upwards in the heating furnace 23, and by the time it finishes passing through the heating furnace 23, the
Heated up to 200℃. Although the solvent in the coating films 5 and 6 is evaporated by heating, they are still in a soft state when they pass through the heating furnace 23. In this heating furnace 23, the atmospheric temperature is made uniform by circulating and blowing atmospheric gas through the air blowing nozzle 43, and the upper wall 23 is designed to prevent high-temperature atmospheric gas from flowing into the water cooling booth 30.
An air curtain is formed in the opening 26 of No. 4.
Of course, this air curtain prevents the organic solvent filling the heating furnace 23 from leaking into the surroundings, deteriorating the working environment and making the factory waste gas treatment troublesome.

The liquid cooling treatment step is carried out in the water cooling booth 30, in which the coated iron wire heated to a high temperature in the heating furnace 23 is sent vertically upward and a cooling liquid is sprayed onto the iron wire to cool the coating film 5. , 6 are cooled and hardened. That is, water cooled to a low temperature is ejected in a mist form from the cooling liquid nozzle 35 to fill the inside of the water cooling booth 30 with the mist cooling water, and the coated steel wire passes through the water cooling booth for 3 to 24 seconds. The iron wire between
It is designed to be cooled to around 100℃. As shown in Fig. 4, the above-mentioned iron wires are run in parallel with an interval W of 3 to 4 cm, and about 5 cooling liquid nozzles 35 are placed on the left and right of the 30 iron wires at the top, middle, and bottom. It is set up in three tiers.

In the top turn wheel 37, as the top turn wheel rotates, the entire circumference of the foil is cooled and at the same time the iron wire is cooled, and cooling water is dripped from a water tank 46 provided directly above the top turn wheel to cool the top turn wheel. The turnwheel 37 and the iron wire are cooled. By this cooling treatment in the top turn foil 37, the iron wire becomes
The temperature drops to below 100℃.

The iron wire that has passed through the top turn foil 37 is immersed in hot water in a hot water tank 38, and passes through the hot water tank for 2 to 6 seconds. At this time, the iron wire has the same temperature as the water temperature in the hot water tank 38. The water temperature in hot water tank 38 is 60-90℃
By adjusting the water temperature, the surfaces of the coating films 5 and 6 are dried before the second coating step or the winding machine 39 is reached.

In the above configuration, a mist of cooling liquid adheres to the colored painted iron wire that has reached a high temperature in the heating furnace 23 during the liquid cooling process, but the cooling liquid immediately evaporates because the colored painted iron wire is at a high temperature. Heating furnace 2
3, and since the colored coated iron wire loses a large amount of vaporization heat when the coolant evaporates, the time required for cooling and hardening the coating films 5 and 6 is shortened to about 3 to 24 seconds. Therefore, even if the processing speed from the coating process to the winding machine 39 is increased to the normal galvanizing processing speed of 5 to 40 m/min, the coating films 5 and 6 will not be scratched or scratched when passing through the top turn foil 37. Since the colored coated iron wire 1 with a smooth surface can be obtained without being damaged, the iron wire material 2 is pulled at a speed of 5 to 40 m/min and subjected to galvanizing treatment, chemical conversion treatment, painting treatment, heat treatment, liquid cooling treatment, etc. It can be rolled up by passing through each process successively.

In addition, in the painting process, one coat of paint
A coating film with a thickness of 10 to 30μ is formed, and in this example, since the undercoat and topcoat are applied twice, the coatings 5 and 6 together form a film with a thickness of 20 to 60μ. This coating does not necessarily have to be carried out twice, but may be carried out once or three times, and the thickness of the coating film can be adjusted to a desired thickness by adjusting the drawing jig 42. can. Also,
The cooling time of the coating films 5 and 6 is set at the line speed of 5 to 40
m/min and the height of the water cooling booth 30 is 2 m, it takes 3 to 24 seconds, but actually the iron wire can be cooled to about 100°C in 3 to 10 seconds, although it depends on the diameter of the iron wire.

Furthermore, although a spray type cooling liquid nozzle is used as the cooling liquid nozzle in the above embodiment, a nozzle that sprays the cooling liquid in a continuous flow onto the iron wire may also be used.

Furthermore, in the above embodiment, equipment for painting, heating, and cooling was connected to the pretreatment, galvanizing treatment, and chemical conversion treatment lines, and the processes from pretreatment to rolling were performed continuously. The process up to the chemical conversion treatment and the process after the chemical conversion treatment may be separate lines, or the process up to the chemical conversion process and the process after the painting process may be separate lines.

Further, in the above embodiment, the manufacturing apparatus of the present invention was applied to form a coating film on iron wire on which a zinc coating and a phosphate coating were formed. Of course, it can also be applied to the case where a coating film is formed on a steel wire that has been subjected to pretreatment and chemical conversion treatment for surface cleaning, or only to this pretreatment.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention; FIG. 1 is a sectional view showing an example of a colored coated iron wire, FIG. 2 is a diagram showing an example of a steel wire processing line incorporating a colored coated steel wire manufacturing apparatus, and FIG. FIG. 4 is a longitudinal cross-sectional view showing the main parts of the processing line, and FIG. 4 is a cross-sectional view taken along the - line in FIG. 1... Colored painted iron wire, 2... Iron wire material, 3...
Zinc coating, 4... Phosphate coating, 5... Undercoat coating, 6... Topcoat coating, 11... Payoff coil, 12... Annealing furnace, 14... Pickling tank, 16...
Flux tank, 18... Zinc plating tank, 20... Chemical conversion tank, 22... Paint tank, 23... Heating furnace, 3
0...Water cooling booth, 35...Cooling liquid nozzle, 37
...Top turn foil, 40 ... Winding coil,
41... Turn wheel, 42... Drawing jig, 43
...Air blowing nozzle, 44...Air blowing nozzle outlet, 45...Water cooling tank, 46...Water tank.

Claims (1)

[Scope of Claims] 1: a coating tank for storing paint; a traction means for vertically pulling the iron wire immersed in the paint in the coating tank; A heating furnace that has openings in the upper and lower walls through which the iron wire passes and bakes the coating film of the iron wire, and an opening in the upper wall of the heating furnace that is arranged above the heating furnace and allows air to pass through. A colored painted iron wire, characterized in that it is equipped with an air blowing nozzle that blows into the heating furnace from above, and a cooling liquid nozzle that is arranged above the air blowing nozzle and that blows out a cooling liquid to the iron wire that is fed vertically. manufacturing equipment.