JPH031093Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a heating device for uniformly heating a strip in a painting line or the like.

(Prior Art) As a conventional heating device for a painting line, the device shown in "Revised and Expanded Drying Edition" published by Kagaku Kogyo Co., Ltd., pages 221 and 222 is generally known.

That is, in the apparatus shown in FIG. 2, a plurality of steam heaters 7 are arranged on the lower surface of the strip 1.
The device shown in Fig. 3 is a circulating hot air blowing type, in which the hot air is heated through a steam heater and then ejected at high speed from a number of blowing nozzles 8. It dries the paint by spraying it on the top and bottom surfaces of strip 1.
The apparatus shown in the figure dries the paint applied to the strip 1 using an infrared heater 10.

(Problem to be solved by the invention) A problem with the prior art is that in devices that dry strips using the heat of a steam heater, the heat of the steam heater is absorbed by the surface of the strip due to the natural convection of the gas in the drying oven. Since the paint is dried, the drying speed is slow, and in order to increase the amount of drying, it is necessary to increase the length of the drying oven.

Also, with devices that dry paint on the strip surface by blowing hot air, the drying speed is fast due to convection heat transfer, but if hot air is blown onto the strip surface when the paint on the strip surface is not dry,
Depending on the paint, ripples and foaming may occur on the surface of the strip, limiting the spraying speed and requiring a longer oven length to increase the amount of drying. Furthermore, although an apparatus using an infrared heater has the advantage that the drying speed can be smoothly controlled, the running cost is high.

(Means for Solving the Problems) The present invention provides a heating device for drying the paint on the surface of a painted strip, in which a radiant wall 3 is disposed opposite to one surface of the strip, and an outer side of the radiant wall 3 is provided. A breathable solid plate 5 is disposed at the air permeable solid plate 5, and a heat exchanger 6 is disposed downstream of the breathable solid plate 5. On the other hand, a burner 2 is disposed between the breathable solid plate 5 and the radiant wall 3.

(Function) The strip 1 conveyed into the heating device is heated by the radiant wall 3 by the burner 2 disposed in the heating device, and indirectly heated by the radiant heat from the heated radiant wall 3. At this time, the combustion exhaust gas from the burner 2 is discharged to the outside of the heating device through an exhaust gas duct (not shown) disposed outside the heat exchanger 6.

That is, when heating the radiant wall 3 with the flame and exhaust gas of the burner 2, the flame and exhaust gas tend to be sucked into the exhaust gas duct side by the exhaust gas duct disposed outside the heat exchanger 6; Since the breathable solid plate 5 is disposed between the heat exchanger 6 and the burner 2, this breathable solid plate 5 acts as a resistor, and the exhaust gas is prevented between the radiation wall 3 and the breathable solid plate 5. The pressure is equalized and the radiant wall 3 is heated uniformly.

Next, the pressure-equalized exhaust gas is uniformly discharged from the surface of the air-permeable solid plate 5 through the pores of the air-permeable solid plate 5. At this time, solid radiation from the breathable solid plate 5 uniformly heats the radiation wall 3 and at the same time improves heating efficiency. On the other hand, the exhaust gas that has passed through the air-permeable solid plate 5 heats a heat exchanger 6 disposed outside the air-permeable solid plate 5, recovers the sensible heat of the exhaust gas, and discharges it through the exhaust gas duct.

(Embodiment) FIG. 1 is a front sectional view showing an embodiment of the present invention.

In FIG. 1, a radiant wall 3 is disposed opposite the strip 1 conveyed to the heating device, and the radiant wall 3
An air permeable solid plate 5 is disposed outside. Next, a heat exchanger 6 is placed outside the air-permeable solid plate 5, and a burner 2 is placed between the radiant wall 3 and the air-permeable solid plate 5.

That is, the flame and exhaust gas generated by the burner 2 heat the radiant wall 3 disposed on one side of the strip, and the radiant heat of the radiant wall 3 causes the strip 1 to heat up.
heat up. At this time, the flame and exhaust gas are sucked into an exhaust gas duct (not shown) disposed outside the heat exchanger 6, so the flame and exhaust gas try to flow toward the exhaust gas duct, uniformly heating the radiant wall 3. Can not do it.

However, in the present invention, since the air permeable solid plate 5 is disposed outside the radiant wall 3, the air permeable solid plate 5 acts as a resistor, and the exhaust gas flows between the radiant wall 3 and the air permeable solid plate 5. The pressure is equalized and the radiation wall 3 is heated uniformly, and the solid radiation from the breathable solid plate 5,
The heating efficiency of the radiant wall 3 is also improved.

On the other hand, the exhaust gas is evenly discharged from the pores of the breathable solid plate 5, and the sensible heat of the exhaust gas is recovered by a heat exchanger 6 disposed outside the breathable solid plate 5, and heated through the exhaust gas duct. Eject outside the device.

(Effects of the invention) As described above, the heating device of the invention uses a burner to dry the paint on the strip surface, which shortens the drying time of the strip and shortens the furnace length, reducing equipment costs. It is inexpensive and uses indirect heating using a radiant wall, so there are no wind ripples or bubbles that occur when hot air is blown. Also, running costs are lower than drying using an infrared heater. As described above, the practical effects of the present invention are very large.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view showing an embodiment of the present invention;
FIG. 2 is an explanatory diagram of a conventional heating device using a steam heater, FIG. 3 is an explanatory diagram of a conventional heating device using circulating hot air blowing, and FIG. 4 is an explanatory diagram of a conventional heating device using an infrared heater. 1... Strip, 2... Burner, 3... Radiation wall, 4... Combustion chamber, 5... Air permeable solid plate, 6...
...Heat exchanger, 7...Steam heater, 8...Hot air blowing nozzle, 9...Hot air circulation duct, 10...Infrared heater.

Claims (1)

[Scope of utility model registration request] In the heating device for drying the strip 1, a radiant wall 3 is disposed opposite to the surface of the strip 1, a permeable solid plate 5 is disposed outside the radiant wall 3, and the permeable solid plate 5 is A strip radiation heating device characterized in that a heat exchanger 6 is disposed on the downstream side, and a burner 2 is disposed between the radiant wall 3 and the breathable solid plate 3.