JP2017014546A - Edge blow device, and edge blow method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an edge blow device and an edge blow method capable of blowing gases to the edge of a metal plate being continuously run, to remove a liquid stably without being followed by difficulty in the adjustment of the position of a blow nozzle with respect to the edge part of the metal plate, and having little adhesion of a liquid to the metal plate due to a liquid splash.SOLUTION: An edge blow device 25 comprises: a blow nozzle 31 for injecting gases to the edge part of a metal plate S; a drive mechanism 33 for driving the blow nozzle 31; a sensor 32 for detecting the edge position of the metal plate S; and a control part 34 for controlling the drive mechanism 33 on the basis of the detection value of the sensor 32. The blow nozzle 31 includes a pair of nozzle bodies 41 for injecting the gases individually to the edge parts of the surface and back face of the metal plate S. Each of the paired nozzle bodies 41 has a base end part 41a extending from the outer side to the inner side of the metal plate S, and a tip 41b extending from the inner side to the outer side of the metal plate S, and is arranged to clamp the edge part of the metal plate S.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an edge blow apparatus and an edge blow method for removing liquid remaining on an edge portion of a metal plate by blowing a gas such as air after performing a liquid treatment on the surface of the continuously running metal plate. .

  In a continuous hot dip galvanizing line, a continuously traveling steel sheet (including a steel strip) is subjected to galvanization and then subjected to chemical conversion treatment with a chemical solution. The chemical solution supplied to the steel plate is removed by being sandwiched between a pair of ringer rolls.

  However, when the steel plate is thick, a gap is formed in the outer portion of the steel plate edge between the pair of ringer rolls, and the chemical solution sticks to the edge portion of the steel plate as the chemical solution protrudes into the gap. When the amount of chemical solution attached increases, a defect called edge stain that is colored or dirty occurs. Such edge stains cause disqualification, and if the degree is poor, the product becomes defective and the steel sheet itself cannot be shipped.

  For this reason, air etc. are sprayed on the edge part of a steel plate with an edge blow apparatus, and adhesion of the chemical | medical solution to the edge part of a steel plate is prevented. In addition, the edge blow device is used not only for chemical conversion treatment but also for general applications for removing liquid protruding from the edge portion of a metal plate, such as cooling treatment with cooling water.

  As an edge blowing device, as described in Patent Document 1, a blow nozzle for injecting a gas such as air to a metal plate, a sensor for detecting the edge position of the metal plate, and an edge position of the steel plate detected by the sensor. What is comprised with the drive device for making a blow nozzle follow is used.

  The edge blow device shown in Patent Document 1 has one gas blowout port at the tip of the blow nozzle, and blows the gas ejected from this one blowout port onto the edge portion of the metal plate. Yes.

JP 11-244927 A

  In the technique of the above-mentioned patent document 1, it is necessary to adjust the position and angle of the blow nozzle so that the blowing port becomes an appropriate position each time the width of the metal plate and the plate passing speed change. However, since the blow nozzle has a small diameter, the range in which the gas is sprayed is local, and it is difficult to adjust the position of the blow nozzle so that the position to which the gas is sprayed is appropriate. For this reason, the position of the blow nozzle is liable to occur, and it is also difficult to follow the position of the blow nozzle against the warp, vibration, and meandering of the metal plate. Furthermore, since the blow direction from the blow nozzle is the direction from the outside to the inside of the metal plate, the positional deviation between the edge position of the steel plate and the outlet of the nozzle tip is more likely to occur.

  When the position of the nozzle outlet at the tip of the nozzle deviates from the edge position of the steel plate in this way, gas such as air cannot be sufficiently supplied to the edge portion of the metal plate, and the liquid at the edge portion of the metal plate can be stabilized. It becomes difficult to remove. Moreover, there is a possibility that liquid splash occurs due to the air blown from the outside of the steel plate and adheres to the steel plate.

  The present invention has been made in view of these points, and it is possible to blow gas to the edge portion of the metal plate without difficulty in adjusting the position of the blow nozzle with respect to the edge portion of the continuously running metal plate. An object of the present invention is to provide an edge blowing device and an edge blowing method that can stably remove liquid and that hardly cause liquid to adhere to a metal plate due to splashing.

  In order to solve the above problems, the present invention provides the following (1) to (10).

(1) An edge blowing device that removes the liquid remaining on the edge portion of the metal plate by blowing gas after performing liquid treatment on the continuously running metal plate,
A blow nozzle for injecting gas to an edge portion of the metal plate;
A drive mechanism for driving the blow nozzle;
A sensor for detecting an edge position of the metal plate;
A control unit that controls the drive mechanism so that the blow nozzle is in an appropriate position based on a detection value of the sensor;
The blow nozzle is
A pair of nozzle bodies for injecting gas to the edge portions of the front and back surfaces of the metal plate, the pair of nozzle bodies respectively extending from the outside to the inside of the metal plate; and the metal plate The edge blower is characterized in that it is disposed so as to sandwich the edge portion of the metal plate.

  (2) The tip of the nozzle body injects gas in a direction from the inner side to the outer side of the metal plate and toward the upstream side in the traveling direction of the metal plate. The edge blow device described.

  (3) The edge blowing device according to (2), wherein an angle of the tip portion with respect to a traveling direction of the metal plate is 10 to 30 °.

  (4) The base end portion of the nozzle body extends inward from the outside of the metal plate so as to be orthogonal to the traveling direction of the metal plate, and an angle of the tip portion with respect to the base end portion is 60 to 80 °. The edge blower according to (3), characterized in that:

  (5) The edge blow apparatus according to any one of (1) to (4), wherein the liquid treatment is a chemical conversion treatment after a hot dip galvanizing treatment.

(6) An edge blow method for removing the liquid remaining on the edge portion of the metal plate by blowing a gas after performing liquid treatment on the continuously running metal plate,
A blow nozzle having a pair of nozzle bodies each having a base end portion extending from the outside to the inside of the metal plate and a tip portion extending from the inside to the outside of the steel plate, the pair of nozzle bodies being edge portions of the metal plate Placed so that
An edge blowing method characterized by injecting gas from the pair of nozzle bodies to the edge portions of the front and back surfaces of the metal plate.

  (7) The tip of the nozzle body injects gas in a direction from the inner side to the outer side of the metal plate and toward the upstream side in the traveling direction of the metal plate. The described edge blowing method.

  (8) The edge blowing method according to (7), wherein an angle of the tip portion with respect to a traveling direction of the metal plate is 10 to 30 °.

  (9) The base end portion of the nozzle body extends inward from the outside of the metal plate so as to be orthogonal to the traveling direction of the metal plate, and an angle of the tip portion with respect to the base end portion is 60 to 80 °. The edge blowing method according to (8), characterized in that:

  (10) The edge blowing method according to any one of (6) to (9), wherein the liquid treatment is a chemical conversion treatment after a hot dip galvanizing treatment.

  In the present invention, it is assumed that the blow nozzle for injecting gas to the edge portion of the metal plate has a pair of nozzle bodies for injecting gas to the edge portions of the front and back surfaces of the metal plate, respectively, And a base end portion extending from the outside to the inside of the metal plate and a tip portion extending from the inside to the outside of the steel plate, and arranged so as to sandwich the edge portion of the metal plate. As a result, it is possible to stably remove the liquid by blowing gas to the edge of the metal plate without difficulty in adjusting the gas blowing position with respect to the edge of the metal plate that is continuously run. It is possible to make it difficult for liquid to adhere to the metal plate due to splashing.

It is the schematic which shows the continuous hot-dip galvanization line where the edge blow apparatus of this invention is applied to a chemical conversion treatment part. It is the schematic which shows the chemical conversion treatment part of the continuous hot dip galvanizing line of FIG. It is a front view which shows the edge blow apparatus which concerns on one Embodiment of this invention. It is a perspective view which shows the blow nozzle in the edge blow apparatus of FIG. It is a top view which shows the blow nozzle in the edge blow apparatus of FIG. It is a side view which shows the blow nozzle in the edge blow apparatus of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
<Continuous hot dip galvanizing line>
FIG. 1 is a schematic view showing a continuous hot dip galvanizing line in which the edge blow apparatus of the present invention is applied to the chemical conversion treatment section.

  The continuous hot dip galvanizing line 1 includes an entrance side equipment 11 including a payoff reel, a welder, an entrance side looper, etc. for delivering a steel sheet (steel strip) S, a continuous annealing furnace 12 for continuously heating the steel sheet S, and continuous annealing. A molten zinc pot 13 installed on the outlet side of the furnace 12, a cooling zone 14, a skin pass mill 15, a chemical conversion treatment section 16 for performing chemical conversion treatment on a hot dip galvanized steel sheet, and an outlet equipment 17 including a tension reel and the like Have

  In such a continuous hot dip galvanizing line 1, the steel sheet S delivered from the payoff reel is annealed in the continuous annealing furnace 12, and then immersed in a hot dip zinc pot 13 to be subjected to hot dip galvanizing treatment. 14, and further, a skin pass process is performed by the skin pass mill 15, and the chemical conversion treatment unit 16 is reached. In the chemical conversion treatment part 16, the chemical conversion treatment film for improving corrosion resistance is formed on the hot dip galvanized layer by spraying a chemical solution such as chromic acid on the steel sheet S. After the chemical conversion treatment, it is wound up by a tension reel on the delivery side.

<Chemical conversion processing department>
Next, the chemical conversion processing unit 16 will be described.
FIG. 2 is a schematic view showing a chemical conversion treatment section of the continuous hot dip galvanizing line of FIG. As shown in FIG. 2, the chemical conversion treatment unit 16 includes a housing 21 and a plurality of chemical liquid nozzles 22 provided in the housing 21. Moreover, the conveyance roll 23 is provided in the housing | casing 21, The steel plate S after the hot dip galvanization process penetrate | invades in the housing | casing 21 from the upper direction of the housing | casing 21, and the steel plate S raises by the conveyance roll 23. Then, it is carried out from the casing 21 upward, and the chemical solution is sprayed from the chemical solution nozzle 23 to the steel plate S in the meantime. A ringer roll 24 that squeezes the chemical solution attached to the steel sheet S is provided above the casing 21, and an edge blow device 25 that blows a gas such as air onto the edge portion of the steel sheet S is further provided thereon. .

<Edge blow device>
Next, the edge blow device 25 will be described.
3 is a front view showing an edge blowing device according to an embodiment of the present invention, FIG. 4 is a perspective view showing a blow nozzle in the edge blowing device of FIG. 3, FIG. 5 is a plan view thereof, and FIG. 6 is a side view thereof. is there.

  As shown in FIG. 3, the edge blowing device 25 drives a pair of blow nozzles 31 that inject air to the edge portion of the steel sheet S, a pair of sensors 32 that detect the edge position of the steel sheet S, and the blow nozzle 31. And a control unit 34 that controls the drive device 33 so that the blow nozzle 31 is in an appropriate position based on the edge position of the steel sheet S detected by the sensor 32. The steel plate S is conveyed from the bottom to the top of the figure. The pair of blow nozzles 31 are provided at positions immediately above the ringer roll 24.

  4 shows details of the blow nozzle 31, and FIG. 5 schematically shows the relationship between the blow nozzle 31 and the steel plate. As shown in FIGS. 4 and 5, the blow nozzle 31 includes a pair of nozzle bodies 41 for injecting air to the edge portions of the front and back surfaces of the steel sheet S, and a connecting portion 42 for connecting the pair of nozzle bodies 41. And a pipe 43 for supplying air to the nozzle body 41 via the connecting portion 42.

  The pair of nozzle bodies 41 has base end portions 41 a extending from both ends of the connecting portion 42 to the inside of the steel sheet S, that is, in a direction orthogonal to the steel plate traveling direction, that is, in the plate width direction. 41b is curving so that air may be injected toward the outside from the inside of the steel sheet S. And the nozzle body 41 is arrange | positioned so that the edge part of the steel plate S may be pinched | interposed as FIG. 5 may inject | pour air into the area | region within about 10 mm in width of the steel plate edge part from the front-end | tip part 41b. Yes. The curvature radius of the base end part 41a and the front-end | tip part 41b of the nozzle body 41 is about 25-45 mm, for example, 35 mm.

  The pipe 43 extends in the vertical direction along the edge of the steel sheet S, and for example, air is supplied at a predetermined pressure and flow rate from a factory air line. The connecting portion 42 is connected to the lower end of the pipe 43 and is arranged in a direction orthogonal to the steel plate S to be conveyed as shown in FIG.

  As shown in FIG. 6, the tip 41b extends not only from the inside to the outside of the steel sheet S as described above, but also to the lower side (upstream side in the running direction of the steel sheet S). Air is ejected obliquely downward with respect to the steel sheet S. At this time, the angle of the tip 41b with respect to the traveling direction of the steel sheet S is related to the chemical removal effect. From the viewpoint of effectively removing the chemical solution and reducing the occurrence of edge stain, the angle of the tip 41b with respect to the traveling direction of the steel sheet S is preferably 10 to 30 °. Further, the angle θ between the base end portion 41a and the tip end portion 41b extending in the plate width direction orthogonal to the traveling direction of the steel plate S is preferably 60 to 80 °.

<Processing operation of chemical conversion processing unit and edge blowing device>
Next, processing operations of the chemical conversion processing unit and the edge blowing device will be described.

  The steel sheet S that has been subjected to hot dip galvanizing and further subjected to skin pass processing is conveyed to the chemical conversion treatment unit 16. In the chemical conversion treatment section 16, the steel sheet S after the hot dip galvanizing process is carried into the casing 21 from above, is turned upward by the transport roll 23, and is conveyed upward from the casing 21. Chemical solution for chemical conversion treatment is sprayed.

  Thereafter, the steel plate S sprayed with the chemical solution is supplied between a pair of ringer rolls 24 disposed above the casing 21, and the chemical solution adhering to the steel plate S is removed there.

  At this time, a gap is formed in the outer portion of the steel plate edge between the pair of ringer rolls 24, and the chemical liquid protrudes into the gap. And the chemical | medical solution which protruded to the edge part of the steel plate S adheres. When the amount of chemical solution attached increases, edge stain occurs. Such edge stains cause disqualification, and if the degree is poor, the product becomes defective and the steel sheet itself cannot be shipped.

  For this reason, an edge blow device 25 for blowing air onto the edge portion of the steel sheet S to prevent the chemical solution from adhering to the edge portion of the steel sheet S is provided above the ringer roll 24. The edge blower 25 is provided immediately above the ringer roll 24 from the viewpoint of quickly removing the chemical solution adhering to the edge portion of the steel sheet S after passing through the ringer roll 24.

  In the edge blow device 25, prior to the edge blow processing, the position of the blow nozzle 31 is adjusted according to the width of the steel sheet S to be processed, the sheet passing speed, and the like, and then the edge blow processing is performed. In the edge blow processing, the sensor 32 detects the edge position of the traveling steel sheet S, and the control unit 34 controls the drive device 33 based on the detection value of the sensor 32 so that the blow nozzle 31 is at an appropriate position.

  The conventional edge blow device has one gas blowout port at the tip of the blow nozzle and has a small diameter, and the gas blown from one blowout port is blown from the outside of the steel plate to the edge portion. Therefore, the blow position is local, and it is difficult to adjust the position and angle of the blow nozzle when the width of the steel plate and the plate passing speed are changed. For this reason, it is easy to produce position shift. In addition, it is difficult for the blow nozzle to follow the warpage, vibration, and meandering of the steel plate. Furthermore, when air is blown from the outside to the inside of the steel plate, the chemical solution may splash and adhere to the steel plate.

  On the other hand, in this embodiment, the blow nozzle 31 has a pair of nozzle bodies 41 extending inward of the steel sheet S, and air is injected from the inner side of the steel sheet S toward the outer side of the tip end portion 41b of the nozzle body 41. The structure is curved as much as possible, and the pair of nozzle bodies 41 are arranged so as to sandwich the edge portion of the steel plate S. In this way, by arranging the pair of nozzle bodies 41 so as to sandwich the edge portion of the steel plate S and blowing air from the inside to the outside of the steel plate S on the front and back edge portions of the steel plate S, Even if the position is slightly deviated, air can be reliably supplied to the steel plate edge portion. For this reason, the liquid of the edge part of the steel plate S can be removed stably without special difficulty in the adjustment of the gas blowing position with respect to the steel plate S edge part. Further, even if the steel sheet S is warped, vibrated, or meandering, air can be reliably supplied to the edge portion of the steel sheet S. Further, since the air ejection direction is from the inner side to the outer side of the steel plate S, the chemical solution at the edge of the steel plate is blown out of the steel plate S, and the chemical solution hardly adheres to the steel plate S due to the liquid splash.

  Moreover, the front-end | tip part 41b of the nozzle body 41 goes up from the inner side to the outer side of the steel plate S and extends downward (upstream in the traveling direction of the steel plate S), and rises because air is jetted obliquely downward. Air can be blown in a direction against the steel sheet S, and the chemical solution can be effectively removed. At this time, by setting the angle of the tip portion 41b to the traveling direction of the steel sheet S to 10 to 30 °, the chemical solution removal effect can be enhanced and the occurrence of edge stain can be reduced. In the case of this example, when the base end portion 41a of the nozzle 41 extends in the plate width direction orthogonal to the traveling direction of the steel plate S, and the angle of the distal end portion 41b with respect to the traveling direction of the steel plate S is 10 to 30 °. The angle θ of the distal end portion 41a with respect to the proximal end portion 41a of the nozzle 41 is 60 to 80 °.

<Other applications>
As mentioned above, although embodiment of this invention was described, this invention can be variously deformed, without being limited to the said embodiment. For example, the shape of the blow nozzle is not limited to that shown in the above embodiment, and any shape may be used as long as the pair of nozzle bodies can supply air from the inside to the outside with the front and back surfaces of the steel plate interposed therebetween. Moreover, although the example which used air as gas was shown in the said embodiment, other gas, such as not only air but nitrogen, may be sufficient. Furthermore, in the above embodiment, the chemical removal after the chemical conversion treatment of the hot dip galvanized steel sheet has been described as an example. In addition, the present invention is not limited to chemical solution for chemical conversion treatment, and can also be applied to removal of cooling liquid during cooling treatment such as water quench, removal of washing liquid in a washing line, and the like.

DESCRIPTION OF SYMBOLS 1 Continuous hot dip galvanizing line 11 Entrance side equipment 12 Continuous annealing furnace 13 Hot dip zinc pot 14 Cooling zone 15 Skin pass mill 16 Chemical conversion part 17 Outlet side equipment 21 Housing | casing 22 Chemical solution nozzle 24 Ringer roll 25 Edge blow apparatus 31 Blow nozzle 32 Sensor 33 drive device 34 control part 41 nozzle body 41a base end part 41b front end part 42 connection part 43 piping S steel plate

Claims (10)

An edge blowing device that removes the liquid remaining on the edge of the metal plate by blowing gas after performing liquid treatment on the continuously running metal plate,
A blow nozzle for injecting gas to an edge portion of the metal plate;
A drive mechanism for driving the blow nozzle;
A sensor for detecting an edge position of the metal plate;
A control unit that controls the drive mechanism so that the blow nozzle is in an appropriate position based on a detection value of the sensor;
The blow nozzle is
A pair of nozzle bodies for injecting gas to the edge portions of the front and back surfaces of the metal plate, the pair of nozzle bodies respectively extending from the outside to the inside of the metal plate; and the metal plate The edge blower is characterized in that it is disposed so as to sandwich the edge portion of the metal plate.   2. The edge according to claim 1, wherein the tip portion of the nozzle body injects gas in a direction from an inner side to an outer side of the metal plate and toward an upstream side in a traveling direction of the metal plate. Blow equipment.   The edge blowing device according to claim 2, wherein an angle of the tip portion with respect to a traveling direction of the metal plate is 10 to 30 °.   The base end portion of the nozzle body extends inward from the outside of the metal plate so as to be orthogonal to the traveling direction of the metal plate, and the angle of the tip portion with respect to the base end portion is 60 to 80 °. The edge blower according to claim 3.   The edge blowing apparatus according to any one of claims 1 to 4, wherein the liquid treatment is a chemical conversion treatment after a hot dip galvanizing treatment. After performing liquid treatment on a continuously traveling metal plate, an edge blowing method for removing the liquid remaining on the edge portion of the metal plate by blowing gas,
A blow nozzle having a pair of nozzle bodies each having a base end portion extending from the outside to the inside of the metal plate and a tip portion extending from the inside to the outside of the metal plate, the pair of nozzle bodies being the metal plate Arrange so that the edge part is sandwiched,
An edge blowing method characterized by injecting gas from the pair of nozzle bodies to the edge portions of the front and back surfaces of the metal plate.   The edge according to claim 6, wherein the tip portion of the nozzle body injects gas in a direction from an inner side to an outer side of the metal plate and toward an upstream side in a traveling direction of the metal plate. Blow method.   The edge blowing method according to claim 7, wherein an angle of the tip portion with respect to a traveling direction of the metal plate is 10 to 30 °.   The base end portion of the nozzle body extends inward from the outside of the metal plate so as to be orthogonal to the traveling direction of the metal plate, and the angle of the tip portion with respect to the base end portion is 60 to 80 °. The edge blowing method according to claim 8.   The edge blowing method according to any one of claims 6 to 9, wherein the liquid treatment is a chemical conversion treatment after a hot dip galvanizing treatment.

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