JP5602371B2 - Gas wiping device - Google Patents

Description

  The present invention relates to a gas wiping apparatus used in a molten metal plating facility in a molten metal plating line of zinc or the like.

  In this kind of molten metal plating line, generally, a strip (steel plate to be plated) continuously subjected to pretreatment such as annealing and kept at a high temperature is passed through a sink roll in a molten metal pot (hot plating bath). A method is used in which the plate is run upward, the plating adhesion amount (molten metal thickness, film thickness) is controlled under the run, and then cooled to room temperature with a predetermined cooling pattern.

  Under the running, the excess of the molten zinc adhering to the surface of the strip is required, for example, by wiping with a gas blown from a pair of wiping nozzles (gas wiping devices) disposed oppositely above the hot dipping bath. It is designed to be controlled by the amount of plating deposited (see Patent Document 1).

  For example, in the conventional gas wiping apparatus, as shown in FIGS. 10 and 11, the gas supplied from the inside of the nozzle header 100 to the wiping nozzle 102 through the gas supply passage 101 is the upper lip of the wiping nozzle 102. The nozzle slit 105 defined between the opposed surfaces of the lower lip 103 and the lower lip 104 is uniformly blown in the strip width direction (not shown).

JP-A-6-330275 Japanese Patent No. 4020217 Japanese Patent No. 3533775 JP 2006-274382 A

  However, in the conventional gas wiping apparatus as described above, the upper lip 103 and the lower lip 104 are integrated with each other by a plurality of vertical fixing bolts 106 (see FIG. 11A), and a plurality of them. The horizontal fixing bolts 107 are integrated on the nozzle header 100 side (see FIG. 11B).

  Therefore, since the gas blowing width in the strip plate width direction of the nozzle slit 105 is fixed, the gas blowing width is set to be equal to or larger than the maximum plate width of the strip. As a result, when wiping the strip with a narrow strip width, the gas outside the strip width is wasted and the opposed blown gases collide at high speed, causing noise, plate vibration and edge overcoat. There was a problem of doing.

  Accordingly, an object of the present invention is a simple structure in which the lip of the wiping nozzle can be moved in the plate width direction of the steel plate, the gas blowing width and the gas blowing position of the nozzle slit in the plate width direction of the nozzle slit are made variable, and the gas An object of the present invention is to provide a gas wiping apparatus that can eliminate unnecessary consumption and suppress generation of noise, plate vibration, and edge overcoat.

  In addition, Patent Document 2 and Patent Document 3 disclose a configuration in which a pair of lips defining a nozzle slit of a wiping nozzle are relatively movable in the plate width direction of a steel plate. The gap between the nozzle slits (interval between the lips) is adjusted by the relative displacement of the pair of lip shapes, and the gas blowing width and the gas blowing position of the nozzle slit in the steel plate width direction are not variable.

  In Patent Document 4, a shut-off belt that shuts off the gas flow is disposed in the wiping nozzle, and a side plate that can move integrally with the shut-off belt is inserted into the nozzle slit, and the shut-off belt is connected to the end of the gas circulation chamber. A gas wiping device is disclosed in which the gas blowing width and gas blowing position in the steel plate width direction of the nozzle slit are made variable by moving the nozzle slit forward and backward from the center portion. As the number of parts increases, the structure including the moving mechanism becomes complicated, leading to an increase in cost and a lack of device reliability.

In order to achieve the above object, a gas wiping apparatus according to the present invention comprises:
In a gas wiping device that controls the amount of coating by spraying gas from the wiping nozzle to the front and back surfaces of the steel plate that runs upward from the hot dipping bath,
The wiping nozzle is divided into an upper lip and a lower lip, and forms a sealing surface that partially closes the gas supply flow path at opposite positions in the gas blowing width direction of both the lips. Is provided to be movable in the plate width direction of the steel plate ,
The upper lip and the lower lip are supported on the gas supply base having the gas supply flow path so as to be slidable in the plate width direction of the steel plate, and are fixed at arbitrary positions on the gas supply base by a lip presser. It is possible .

Also,
Each of the opposed surfaces for forming the nozzle slit of the upper lip and the lower lip is formed with a recessed portion at a position that is always located near the plate end of the steel plate, and the gap of the nozzle slit is closer to the plate end than the plate central portion of the steel plate. It is characterized by being made larger.

Also,
A moving mechanism capable of independently moving the upper lip and the lower lip in the plate width direction of the steel sheet;
Driving means for independently moving the lips;
A plate end detection sensor that is attached to both the lips and detects a plate end of the steel plate;
Control means for controlling the both drive means so as to correspond to the position change of the plate end portion of the steel plate based on the detection signals from the both plate end detection sensors;
It is provided with.

Also,
Baffle plates are installed on the upper lip and the lower lip.

  According to the gas wiping device of the present invention having the above-described configuration, the wiping nozzle is divided into the upper lip and the lower lip, and the upper and lower lips are moved in different directions in the plate width direction of the steel plate. Thus, the gas blowing width in the steel plate width direction of the nozzle slit can be changed corresponding to the plate width of the steel plate, and the upper and lower lips are moved in the same direction in the plate width direction of the steel plate. The gas blowing position in the width direction of the steel plate of the nozzle slit can be changed corresponding to the meandering.

  As a result, it is possible to avoid the generation of noise, plate vibration and edge overcoat due to wasteful consumption of gas outside the plate width and collision of opposed blown gases at high speed.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic structure side view of the gas wiping apparatus used for the molten metal plating equipment in the molten metal plating lines, such as zinc, which shows Example 1 of this invention. FIG. 5 is a cross-sectional view corresponding to a cross section taken along line FF in FIG. 3 showing different operating states of the wiping nozzle. FIG. 5A is an operating state diagram when the strip is narrow, and FIG. It is an action state figure. It is AA arrow sectional drawing of FIG.2 (b). It is BB arrow sectional drawing of FIG.2 (b). It is CC sectional view taken on the line of FIG.2 (b). FIG. 9 is a front view showing different operation states of the wiping nozzle showing the second embodiment of the present invention, in which FIG. (A) is an operation state diagram when the strip is narrow, and (b) is an operation state when the strip is wide. FIG. FIG. 10 is a front view showing different operating states of the wiping nozzle according to the third embodiment of the present invention, in which FIG. (A) is an operating state diagram when the strip is narrow, and (b) is when the strip is wide. FIG. FIG. 10 is a front view showing different operating states of the wiping nozzle according to the fourth embodiment of the present invention, in which FIG. (A) is an operating state diagram when the strip is narrow, and (b) is when the strip is wide. FIG. It is sectional drawing of the wiping nozzle equivalent to the BB arrow of FIG.2 (b) which shows Example 5 of this invention. It is a principal part front view of the conventional gas wiping apparatus. Similarly, it is sectional drawing of a gas wiping apparatus, the figure (a) is DD sectional view taken on the line of FIG. 10, and the figure (b) is sectional drawing taken on the line EE of FIG.

  Hereinafter, the gas wiping apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

  1 is a side view of a schematic configuration of a gas wiping apparatus used in a molten metal plating facility in a molten metal plating line for zinc or the like showing Embodiment 1 of the present invention, and FIG. 2 is a diagram showing different operating states of a wiping nozzle in FIG. FIG. 4A is a cross-sectional view corresponding to the arrow FF, FIG. 3A is an operation state diagram when the strip is narrow, FIG. 3B is an operation state diagram when the strip is wide, and FIG. 3 is FIG. FIG. 4 is a cross-sectional view taken along the line BB in FIG. 2B, and FIG. 5 is a cross-sectional view taken along the line CC in FIG. 2B.

  As shown in FIG. 1, a pair of gas wiping devices 11 are provided facing the front and back surfaces of a strip (steel plate) S that travels upward from a molten metal pot (hot-plating bath) 10, A gas is blown onto the surface of the strip S from the wiping nozzle 12 of these gas wiping apparatuses 11 (see the arrow in FIG. 1) so that the plating adhesion amount (molten metal thickness, film thickness) can be controlled. 1 shows the gas wiping device 11 on one side of the front and back surfaces of the strip S, and the gas wiping device 11 on the other side includes a gas wiping device 11 arranged symmetrically around the strip S. Since it is the same structure, illustration is abbreviate | omitted.

  Specifically, in the gas wiping device 11, the gas supplied from the inside of the nozzle header 13 to the wiping nozzle 12 through the gas supply flow path 15 of the manifold 14 is the upper lip 16 and the lower lip of the wiping nozzle 12. The nozzle slits 18 defined between the opposed surfaces 16a and 17a with the nozzle 17 are uniformly blown out in the plate width direction of the strip S.

  In the wiping nozzle 12, a T-shaped slide base (gas supply base) 20 is bolted laterally to the joint flange portion 19 of the manifold 14, and the gas supply flow path 21 is a gas supply flow of the joint flange portion 19. It communicates with the gas supply flow path 15 of the manifold 14 via a path 22. The gas supply flow path 21 of the slide base 20 includes a collecting flow path portion 21a and a porous flow path portion 21b (see FIGS. 2A and 2B).

  The above-described upper lip 16 and lower lip 17 are mounted on the horizontal convex portion 20a of the slide base 20 so as to sandwich the convex portion 20a from above and below.

  Specifically, the base portions of the upper lip 16 and the lower lip 17 are engaged with the upper and lower surfaces of the convex portion 20a via the upper and lower sliding liners 23A and 23B in an uneven state, respectively. The upper lip 16 and the lower lip 17 are pressed and fixed at arbitrary positions on the upper and lower surfaces of the convex portion 20a by the air pressure of the upper and lower static pressure pads (lip pressers) 24A and 24B. When the upper and lower static pressure pads 24A and 24B are released (or depressurized), the upper lip 16 and the lower lip 17 have the upper and lower sliding liners 23A and 23B on the upper and lower surfaces of the convex portion 20a, respectively. The strip S is slidable in the plate width direction.

  The upper and lower sliding liners 23A and 23B are oilless, but may be LM guided. Further, when the upper lip 16 and the lower lip 17 are fixed to the upper and lower static pressure pads 24A and 24B, the upper and lower static pressure pads 24A and 24B, the internal passages of the slide base 20 and external piping (not shown) are provided. The air pressure is supplied from a pressurized air supply source such as a compressor, but other fluid pressures may be supplied instead of the air pressure, or the upper and lower static pressure pads 24A and 24B. Instead of this, mechanical fixing means may be used.

  As shown in FIGS. 2 to 5, a rack (moving mechanism) 25A is attached to the back surface of the upper lip 16 in the longitudinal direction. The upper lip moving motor (driving means) 27A supported by appropriate means is fixed on the output shaft of the lower lip 17, and a rack (moving mechanism) 25B is attached to the back of the lower lip 17 in the longitudinal direction. A pinion (fixed on an output shaft of a lower lip moving motor (driving means) 27B supported by an appropriate means on a fixing member of the gas wiping device 11 on an idle gear (moving mechanism) 28 meshing with the rack 25B. (Moving mechanism) 26B is engaged. The idle gear 28 is rotatably supported on a support shaft 29 planted on the slide base 20.

  Accordingly, the upper lip 16 and the lower lip 17 can be slid independently in any direction. With this slide, the upper lip 16 and the lower lip 17 are partially provided with the porous flow path portion 21b of the gas supply flow path 21 in the slide base 20 in the longitudinal direction of the nozzle slit 18 (in the plate width direction of the strip S). Sealing surfaces 16A and 17A are formed at opposite positions different from each other in the gas blowing width direction (see FIGS. 4 and 5).

  Moreover, in the part which has the said sealing surfaces 16A and 17A of the upper lip 16 and the lower lip 17, the opposing surfaces of the respectively corresponding lower lip 17 and the upper lip 16 are airtightly adhered, and side seals Sa and Sb are respectively provided. (See FIGS. 4 and 5).

  Because of this configuration, for example, when the strip S is changed from wide to narrow, as shown in FIG. 2A, the upper lip 16 and the lower lip 17 overlap each other (the center of the pass line). The gas blowing width in the strip plate width direction of the nozzle slit 18 becomes narrower corresponding to the plate width of the strip S by sliding in a reciprocal manner (see the arrow in the figure). That is, gas from a part of the porous flow path portion 21 b in the slide base 20 is blown out from the nozzle slit 18, and the other porous flow path portion 21 b of the slide base 20 has the above-described sealing surface 16 A of the upper lip 16 and the lower lip 17. , 17A.

  On the contrary, when the strip S is changed from narrow to wide, as shown in FIG. 2B, the upper lip 16 and the lower lip 17 are separated from each other (direction away from the center of the pass line). By sliding in a reciprocal manner (see the arrow in the figure), the gas blowing width in the strip plate width direction of the nozzle slit 18 becomes wider corresponding to the plate width of the strip S (the maximum width in the illustrated example). That is, the gas from all the porous flow path portions 21 b in the slide base 20 is blown out from the nozzle slit 18.

  Further, by sliding both the upper lip 16 and the lower lip 17 in the same direction, the gas blowing position in the strip plate width direction can be changed without changing the gas blowing width in the strip plate width direction of the nozzle slit 18. . That is, when the strip S meanders, the upper lip 16 and the lower lip 17 can follow and slide, and the gas blowing width in the strip plate width direction of the nozzle slit 18 is always set to the plate width of the strip S. It is made to correspond so that an important relationship (in a gas blowing width and a blowing position) may be maintained.

  As a result, according to the present embodiment, wasteful consumption of gas outside the plate width of the strip S can be avoided in advance, and energy saving can be achieved. That is, by reducing the gas outside the plate width, it is possible to reduce the gas supply amount as long as the nozzle internal pressure is constant, and conversely, the nozzle internal pressure can be increased with a small gas supply amount. . In addition, since the amount of the blown-out gas facing outside the width of the strip S is reduced, it is possible to suppress the occurrence of noise, plate vibration, and edge overcoat due to collision of the opposed blown gases at high speed.

  Further, the upper lip 16 and the lower lip 17 are respectively formed with sealing surfaces 16A and 17A for partially closing the porous flow path portion 21b of the gas supply flow path 21 in the slide base 20 in the longitudinal direction of the nozzle slit 18 and the upper lip. Since the intended purpose can be achieved by sliding the 16 and the lower lip 17 in the plate width direction of the strip S, a simple structure including the aforementioned rack and pinion moving mechanism, motor driving means, and the like is sufficient.

  6A and 6B are front views showing different operating states of the wiping nozzle according to the second embodiment of the present invention. FIG. 6A is an operating state diagram when the strip is narrow, and FIG. 6B is a strip. It is an action state figure at the time of wide.

  In this embodiment, the concave portions 16b and 17b are formed in the portions of the opposed surfaces 16a and 17a that form the nozzle slits 18 of the upper lip 16 and the lower lip 17 in the first embodiment and always located near the plate end of the strip S. In this example, the gap between the nozzle slits 18 is larger in the vicinity of the plate end than in the center of the plate of the strip S. Other configurations are the same as those in the first embodiment.

  According to the present embodiment, in addition to the same operations and effects as in the first embodiment, the amount of gas supply is increased near the plate end of the strip S than in the center portion of the strip S, and the gas supply amount is opposed to the outside of the strip S. The influence of the collision of the blown gases at high speed is small, and the improvement of the wiping capability can further suppress the occurrence of noise, plate vibration and edge overcoat.

  FIGS. 7A and 7B are front views showing different operating states of the wiping nozzle according to Embodiment 3 of the present invention. FIG. 7A is an operating state diagram when the strip is narrow, and FIG. FIG.

  In this embodiment, plate end detection sensors (photosensor, 2D laser sensor, etc.) 30A and 30B are attached to the portions of the upper lip 16 and the lower lip 17 in the first embodiment that are always located near the plate end of the strip S. In this example, the upper and lower lip movement motors 27A and 27B are driven and controlled by a lip movement control controller (control means) 31 comprising a microcomputer or the like for inputting detection signals from the plate end detection sensors 30A and 30B. Other configurations are the same as those in the first embodiment.

  According to the present embodiment, in addition to the same operations and effects as the first embodiment, the gas blowing width and the gas blowing position of the nozzle slit 18 in the strip plate width direction can be adjusted automatically and accurately.

  FIGS. 8A and 8B are front views showing different operating states of the wiping nozzle according to the fourth embodiment of the present invention. FIG. 8A is an operating state diagram when the strip is narrow, and FIG. It is an action state figure at the time of wide.

  In this embodiment, the upper lip 16 and the lower lip 17 according to the first embodiment are prevented from colliding with each other at the portions that are always located in the vicinity of the plate end of the strip S and outside the strip S. The baffle plates 32A and 32B are attached, and other configurations are the same as those in the first embodiment. The baffle plates 32A and 32B are fixed so as not to move in the plate width direction with respect to the lips 16 and 17, but are movable in the direction perpendicular to the plate width direction and the plate end portion of the strip S. It is preferable to be able to swing following the movement in the direction perpendicular to the plate width direction.

  According to the present embodiment, in addition to the same operations and effects as in the first embodiment, the plate end of the strip S and the ends of the baffle plates 32A and 32B can be brought close to each other with accuracy, and the operation of the baffle plates 32A and 32B can be achieved. It can be fully utilized to further suppress the occurrence of edge overcoat.

  FIG. 9 is a cross-sectional view of a wiping nozzle corresponding to the arrow BB in FIG. 2 (b), showing Embodiment 5 of the present invention.

  In this embodiment, the sealing surfaces 16A and 17A of the upper lip 16 and the lower lip 17 in the first embodiment are opposed to the facing surface 16a that forms the nozzle slit 18 from a portion of the slide base 20 that closes a part of the porous flow path portion 21b. , 17a, and the other configuration is the same as that of the first embodiment.

  Also according to the present embodiment, the same operations and effects as those of the first embodiment can be obtained.

  It should be noted that the present invention is not limited to the above-described embodiments, and it goes without saying that various modifications such as changes in the shapes of the upper and lower lips, the slide base, and the convex portions thereof are possible without departing from the scope of the present invention. . In each of the above embodiments, both the upper and lower lips are moved to change the gas blowing width in the strip plate width direction and the gas blowing position in the strip plate width direction. It goes without saying that the gas blowing width in the strip plate width direction can be made variable by moving the gas.

  The gas wiping apparatus according to the present invention can be applied to an iron manufacturing process line.

10 Molten metal pot (hot dip plating bath)
DESCRIPTION OF SYMBOLS 11 Gas wiping apparatus 12 Wiping nozzle 13 Nozzle header 14 Manifold 15 Gas supply flow path 16 Upper lip 16A Sealing surface 16a Opposing surface 16b Recessed part 17 Lower lip 17A Sealing surface 17a Opposing surface 17b Recessed part 18 Nozzle slit 19 Joint flange part 20 Slide Base (Gas supply base)
20a Convex part 21 Gas supply flow path 21a Collecting flow path part 21b Porous flow path part 22 Gas supply flow path 23A Upper sliding liner 23B Lower sliding liner 24A Upper static pressure pad (lip presser)
24B Lower Static Pressure Pad (Lip Presser)
25A, 25B rack (moving mechanism)
26A, 26B pinion (moving mechanism)
27A Upper lip moving motor (driving means)
27B Lower lip movement motor (drive means)
28 Idle gear 29 Support shaft 30A, 30B Plate end detection sensor 31 Controller (control means) for lip movement control
32A, 32B Baffle plate S Strip (plate to be plated)
Sa, Sb Side seal

Claims (4)

In a gas wiping device that controls the amount of coating by spraying gas from the wiping nozzle to the front and back surfaces of the steel plate that runs upward from the hot dipping bath,
The wiping nozzle is divided into an upper lip and a lower lip, and forms a sealing surface that partially closes the gas supply flow path at opposite positions in the gas blowing width direction of both the lips. Is provided to be movable in the plate width direction of the steel plate ,
The upper lip and the lower lip are supported on the gas supply base having the gas supply flow path so as to be slidable in the plate width direction of the steel plate, and are fixed at arbitrary positions on the gas supply base by a lip presser. A gas wiping device characterized in that it is possible . Each of the opposed surfaces for forming the nozzle slit of the upper lip and the lower lip is formed with a recessed portion at a position that is always located near the plate end of the steel plate, and the gap of the nozzle slit is closer to the plate end than the plate central portion of the steel plate. The gas wiping device according to claim 1 , wherein the gas wiping device is made larger. A moving mechanism capable of independently moving the upper lip and the lower lip in the plate width direction of the steel sheet;
Driving means for independently moving the lips;
A plate end detection sensor that is attached to both the lips and detects a plate end of the steel plate;
Control means for controlling the both drive means so as to correspond to the position change of the plate end portion of the steel plate based on the detection signals from the both plate end detection sensors;
The gas wiping apparatus according to claim 1 or 2 , further comprising: The gas wiping apparatus according to claim 1, 2 or 3 , wherein baffle plates are installed on the upper lip and the lower lip.

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