JPS638753Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a floater nozzle for a floater that receives a steel plate in the hot air flow of a floating furnace that continuously heat-treats the steel plate. This invention relates to a floater nozzle device that floats a steel plate on a hot air stream.

For example, in a continuous production line for painted steel plates, after coating the steel plate with paint, the steel plate is passed through a heat treatment furnace called an open process in order to bake the paint onto the steel plate. An example of such a manufacturing line will be explained next using the drawings.

FIG. 1 is a side view of the layout of a zinc chrome metal manufacturing line in a manufacturing apparatus for zinc-rich primer steel sheets manufactured by coating and baking paint. 1 is an uncoiler, 2 is an up-cut shear, 3 is a welder, 4 is a degreasing equipment, 5 is an entrance looper, and 6 is a polishing brush.The steel plate that has been pretreated with the above equipment is transferred to a first coater 7. After the first paint called Dacromet is applied and baked in the first open 9, the second coater 8
A second coating called zinc chromate is applied, baked in a second oven 10, and then cooled by a water cooling facility 11. After that, the painted steel plate is treated with a leveler 12, a temper color polishing means 13, an outlet looper 14, and an appearance inspection means 15.
After passing through an oiler 16 and a split shear 17, it is wound up into a coiler 18.

In the production line, the conventional method of supporting the steel plate using rolls is discontinued in the first oven 9 and the second oven 10 for various purposes such as shortening the oven length, saving energy, and preventing the occurrence of scratches on the steel plate due to the rolls. As a result, ovens equipped with a steel plate support system called the floater system began to be adopted. In this floater method, a steel plate is floated by a hot air stream blown out from a slit in a nozzle.As shown in the longitudinal cross-sectional view of FIG. 2, floater nozzles 19, 19, Heat transfer nozzle 2
0 are provided adjacent to each other, and the nozzles 19, 2
The steel plate is floated and heated by being sandwiched from above and below by a stream of hot air of 300°C or more blown out from each of the slits 21, 21; 22 of 0. Lower slit 2
The blowing from the upper slits 21, 21 is suppressed so that the steel plate 23 does not rise too much due to the blowing from the upper slits 1, 21.

Lower floater nozzle 19 and steel plate 23 in FIG. 3
As can be seen from the perspective view showing the relationship between On the upper surface of the body, steel plate 2
A pair of slits 21, 21 are provided perpendicularly to the traveling direction of the steel plate over a length corresponding to almost the entire width of the steel plate, sandwiching the center of the upper surface and facing each other to blow out hot air. When the steel plate 23 is floated by the hot air flow, its shape tends to be arched, which is called a C-curve, as shown in the cross-sectional view of FIG. Even when installed, the steel plate does not have a flat shape as shown by the dotted line in the above figure, so the steel plate does not have a flat shape as shown by the dotted line in the same figure, so the steel plate is exposed to the inlet and outlet of the furnace, the upper and lower floater nozzles 19, and the upper surface of the high point in the center in the width direction, the lower surface of both ends, and the upper and lower floater nozzles 19. Contact with the transfer nozzle 20 causes scratches on the painted surface of the painted plate. The incidence of this flaw increases as the width of the steel plate increases. That is, a defect in the structure of the nozzle 19 is one of the major causes of the occurrence of this flaw.

The object of the present invention is to provide a floater nozzle that eliminates and improves the above-mentioned defects, and achieves the above-mentioned object by providing a floater nozzle device as described in the claims of the utility model registration. I can do it.

Next, the present invention will be explained in detail.

The inventors of the present invention determined that the cause of the C warping was an inappropriate pressure distribution of the hot air for floating while heating the steel plate, and conducted research on how to optimize it.
As research progressed, it was discovered that the cause was not only due to inappropriate pressure distribution, but also that residual strain during rolling of the steel plate was reheated in the rotating furnace, resulting in deformation. Therefore, in addition to the measures to make the pressure distribution uniform, C.
In order to prevent sliding, various types of floater nozzles were prototyped, and after repeated experiments, the nozzle of the present invention was completed.

That is, in the present invention, conventional floater nozzles are arranged above and below the steel plate, and in contrast to the C-striped shape, the upper nozzle has a slit 2 in order to push down the high central part of the steel plate.
9, 29 are additionally installed, and in the lower nozzle, in order to enhance the effect of the slits 29, 29, a cylinder 37 is installed in the center to eliminate ineffective excess pressure.
Furthermore, in order to deal with the sagging of both ends of the steel plate, a pair of two opposing strong slits 35, 35 or 35', 35' are added to the conventional nozzle at each end. It has enhanced correction ability.

Next, the present invention will be explained with reference to the drawings.

FIG. 5 is a perspective view of the upper floater nozzle 25 placed upside down relative to the installed state. The upper floater nozzle 25 is provided with a total of four slits for blowing out hot air, one pair each parallel to the opposite sides of the square surface facing the steel plate 23, and the pair of slits 27, 27 are They are provided perpendicularly to the traveling direction of the steel plate 23, over a length corresponding to almost the entire width of the steel plate 23 on the surface, and facing each other with the center portion of the surface in between. The other pair of slits 29, 29 are provided parallel to the traveling direction of the steel plate 23, facing each other across the center of the surface.

FIG. 6 is a perspective view of the lower floater nozzle 31 in the installed state. Lower floater nozzle 3
A total of six slits for blowing out hot air are provided in three pairs in parallel to opposite sides of the square surface facing the steel plate 23, and the slits 33, 33
are provided perpendicularly to the traveling direction of the steel plate 23, facing each other across the center of the surface over a length corresponding to almost the entire width of the steel plate 23. The slits 35, 35; 35', 35' are parallel to the advancing direction of the steel plate 23, respectively;
The slits 35 are provided facing each other on the inner side of one end of the steel plate 23 on the surface.
5' and 35' are provided facing each other on the surface inside one end of the steel plate 23. A tube 37 is provided at the center of each of the rectangular surface and bottom surface of the lower floater nozzle 31 so as to penetrate both surfaces.

To use the floater nozzle of the present invention, it must be installed in the determined position as shown in Figures 7 and 8, and the upper and lower floater nozzles 25 and 3
1. When hot air is supplied from each hot air inlet 39 and the steel plate 23 is passed between both nozzles 25 and 31,
The hot air flow blown out from the slits 27, 27; 33, 33 lifts the steel plate 23 as in the conventional case, and as described above, the cross-sectional shape of the steel plate 23 tends to be curved as shown by the dotted line in FIG. However, by applying dynamic pressure to both ends of the steel plate width from the slits 35, 35; 35', 35', both ends are pushed up, and the center part of the steel plate 23 and the nozzle 31 are pushed up. Regarding the cause of C warping due to the pressure of hot air retained between the surface of
In addition, slit 2 against the remaining C sled.
By applying a dynamic downward force of hot air from 9 and 29, the strong force from above and below corrects even the deformation of the steel plate due to strain during rolling.

Utilizing the powerful straightening function of the C-curve reduces the occurrence of C-curve, and it has become possible to expand the line, which previously had a maximum processing width of 1200 mm, to a width of 1600 mm.

The floater nozzle of the present invention is not limited to the above-mentioned painting line, but is extremely effective for use in continuous heat treatment furnaces for steel plates, especially for preventing defects during continuous heat treatment of processed materials whose surfaces are easily damaged. can be,
Furthermore, this makes it possible to reduce the size of the device, thereby reducing equipment costs and improving thermal efficiency, which is extremely effective industrially.

[Brief explanation of the drawing]

Fig. 1 is an elevational view of the layout of a zinc chrome metal production line, Fig. 2 is a vertical sectional view of a portion of the conventional floater system, Fig. 3 is a perspective view showing the relationship between the conventional lower floater nozzle and the steel plate, and Fig. 4 The figure is a sectional view showing the relationship between the lower floater nozzle and the steel plate, Figure 5 is a perspective view of the upper floater nozzle of the present invention when it is placed upside down, Figure 6 is a perspective view of the lower floater nozzle, and Figure 7 is a perspective view of the lower floater nozzle. 8 shows a front view of the upper and lower floater nozzles, and FIG. 8 shows a cross-sectional view taken from FIG. 7. 23... Steel plate, 25... Upper floater nozzle, 27... Slit, 29... Slit, 31
... lower floater nozzle, 33 ... slit,
35, 35'...slit, 37...tube, 39...
...Hot air inlet.

Claims (1)

[Claims for Utility Model Registration] 1. In a floater nozzle device that is installed in a floating furnace that continuously heat-treats steel plates and includes an upper floater nozzle 25 and a lower floater nozzle 31, each of which has a rectangular surface facing the steel plate: The upper floater nozzle 25 is provided with a total of four hot air blowing slits 27, 27; 29, 29, one pair each in parallel to opposite sides of the surface, and two of the pair of slits 27, 27; The two slits 29, 29 of the other pair are provided parallel to the traveling direction of the steel plate 23, respectively; A total of 3 pairs of 6 slits for blowing out hot air are provided parallel to the sides, and each pair of slits 33 and 33 are perpendicular to the traveling direction of the steel plate 23, and the other 2 pairs of slits are arranged in parallel with each other. 35,3
5; The four pieces 35' and 35' are each provided parallel to the traveling direction of the steel plate 23; A cylinder 37 is provided in the center of each of the surface and the bottom surface of the lower floater nozzle 31 so as to penetrate both surfaces. In the upper floater nozzle 25 and the lower floater nozzle 31, the hot air introduced from the hot air inlet 39 passes through the slits 27, 27; 29,
29 and 33, 33; 35, 35; 35',
A floater nozzle device in which a part of the hot air blown from 35' toward the steel plate 23 and blown from the slits 33, 33 is discharged out of the nozzle system through a cylinder 37. 2. The slits 27, 27; 33, 33 are provided facing each other across the center of the surface on the square surface, respectively, over a length corresponding to almost the entire width of the steel plate 23. A floater nozzle device according to claim 1. 3. The floater nozzle device according to claim 1, wherein the slits 29, 29 are provided facing each other with the central portion of the surface in between. 4. The slits 35, 35 are provided facing each other on the surface inside one end of the steel plate 23, and the slits 35', 35' are provided facing each other on the surface inside the other end of the steel plate 23. 2. A floater nozzle device according to claim 1, which is provided to face the floater nozzle device.