JP2014201751A - Acid cleaning apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an acid cleaning apparatus in which a discharge amount of an acid cleaning liquid can be reduced.SOLUTION: An acid cleaning apparatus 1 passes a steel strip 10 through the inside of an acid cleaning tank 30 to immerse the steel strip 10 in an acid cleaning liquid W inside the acid cleaning tank 30. The acid cleaning apparatus 1 includes: a liquid draining roll 43; and a blockage plate 50. The liquid draining roll 43 is made to rotatably contact to a top face of the steel strip 10 in the acid cleaning tank 30. The blockage plate 50 is disposed to a lower part of the liquid draining roll 43 in the acid cleaning tank 30. The blockage plate 50 blocks a flow of the acid cleaning liquid W in a lower surface side of the steel strip 10.

Description

  The present invention relates to a pickling facility in which a steel strip is passed through a pickling tank and the steel strip is immersed in a pickling solution.

  As pickling equipment for removing an oxide scale film formed on the surface of a hot-rolled steel strip, a dip-type pickling equipment using hydrochloric acid or sulfuric acid is known. In such a dip type pickling facility, a pair of ringer rolls are provided on the entry side and the exit side of the pickling tank, and the steel strip is horizontally passed through the pickling tank with tension applied between the ringer rolls. By doing so, the steel strip is immersed in the pickling solution in the pickling tank.

  Moreover, in order to reduce the pickling solution or shorten the pickling time, there is a jet type pickling facility equipped with a nozzle that makes the pickling tank shallow and jets and stirs the pickling solution. As such a jet-type pickling facility, there is one described in Patent Document 1, for example.

  In the jet-type pickling facility described in Patent Document 1, the amount of pickling liquid discharged to the inlet side pickling liquid discharge port beyond the inlet side weir of the pickling tank and the outlet side weir of the pickling tank In order to keep the ratio of the amount of pickling liquid discharged to the outlet side pickling liquid outlet to be constant, the height of the inlet side weir and outlet side weir is made variable so that the lower surface of the steel strip and the inlet side weir The gap between the upper end of the outlet and the upper end of the exit weir is adjustable.

JP 2007-246995 A

  In order to improve the productivity of the steel strip, the steel plate passing speed is increased (for example, about 420 mpm). In the case of the pickling equipment that immerses the steel strip in the pickling tank, the pickling liquid is discharged from the pickling tank with the movement of the steel strip. The amount of liquid increases. For example, in the pickling equipment described in Patent Document 1, it is conceivable to reduce the amount of pickling liquid discharged by further narrowing the gap between the exit side weir and the steel strip. The upper end of the weir is in contact with the lower surface of the steel strip, which may cause wrinkles in the steel strip.

  Then, an object of this invention is to provide the pickling equipment which can reduce the discharge amount of a pickling liquid.

  The pickling equipment of the present invention passes a steel strip into a pickling tank and immerses the steel strip in a pickling solution in the pickling tank. This pickling facility includes a roll and a blocking means. The roll abuts rotatably on the upper surface of the steel strip in the pickling tank. The blocking means is disposed in the lower part of the roll in the pickling tank, and blocks the flow of the pickling liquid on the lower surface side of the steel strip.

  According to this pickling equipment, the flow of the pickling liquid from the entrance side to the exit side of the pickling tank is interrupted by the rolls as the steel strip moves on the upper surface side of the steel strip. Further, the flow of the pickling liquid from the entrance side to the exit side of the pickling tank by the movement of the steel strip on the lower surface side of the steel strip is blocked by the blocking means. In this way, the flow rate of the pickling solution that moves toward the exit side of the pickling tank can be interrupted on both the upper surface side and the lower surface side of the steel strip, so that the plate passing speed of the steel strip is increased. Even so, the discharge amount of the pickling solution can be further reduced.

  The blocking means is a blocking plate, and the distance between the upper end of the blocking plate and the steel strip is preferably 10 mm or less. In this case, the flow of the pickling liquid that is accompanied by the movement of the steel strip on the lower surface side of the steel strip and moves from the entry side to the exit side of the pickling tank can be effectively blocked by the blocking means. Thereby, the discharge amount of the pickling solution can be further reduced.

  It is preferable that the roll rotates as the steel strip moves. In this case, the roll is rotated with the movement of the steel strip, so that the steel strip is hardly wrinkled. Moreover, the flow of the pickling liquid which is moved by the movement of the steel strip on the upper surface side of the steel strip can be blocked.

  According to the present invention, the amount of pickling solution discharged can be reduced.

It is a side view showing a schematic structure of pickling equipment concerning an embodiment. It is sectional drawing along the II-II line in FIG. It is a figure which shows the pickling liquid which flows the upper surface side of the steel strip of FIG. 1, (a) is the figure seen from the rotating shaft direction of the liquid removal roll, (b) is the figure seen from the upper direction. It is a figure which shows the pickling liquid which flows the lower surface side of the steel strip of FIG. 1, (a) is the figure seen from the rotating shaft direction of the liquid removal roll, (b) is the figure seen from upper direction, (c) is It is sectional drawing along the IVc-IVc line | wire in (b). It is a figure which shows the pickling liquid which flows through the upper surface side of the steel strip in the case where the blocking plate is installed on the outlet side from the liquid cutting roll, (a) is a view seen from the direction of the rotation axis of the liquid cutting roll, ) Is a view from above. It is a figure which shows the pickling liquid which flows the lower surface side of the steel strip in the case of installing a blocking plate on the outlet side from the liquid draining roll, (a) is a diagram seen from the rotation axis direction of the liquid draining roll, ) Is a view from above. It is a figure which shows the pickling liquid which flows through the upper surface side of the steel strip in the case of installing the blocking plate on the entry side from the liquid draining roll, (a) is a diagram seen from the rotational axis direction of the liquid draining roll, ) Is a view from above. It is a figure which shows the pickling liquid which flows through the lower surface side of the steel strip in the case where the blocking plate is installed on the entry side from the liquid draining roll, (a) is a diagram seen from the rotation axis direction of the liquid draining roll, ) Is a view from above. It is a figure which shows the pickling liquid which flows the upper surface side and lower surface side of a steel strip in the case of not installing a shielding plate, (a) is a figure seen from the rotating shaft direction of the liquid draining roll, (b) is seen from above. It is a figure. It is a figure which shows the measurement result of the peak value of the outflow amount of the pickling liquid discharged | emitted from a pickling tank for every plate speed. It is a figure which shows the measurement result of the peak value of the outflow amount of a pickling liquid at the time of changing the installation position of a shielding board. It is a figure which shows the measurement result of the peak value of the outflow amount of a pickling liquid when the space | interval of the lower surface of a steel strip and the upper end of a shielding board is changed.

  Preferred embodiments of the present invention will be described below with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIGS. 1 and 2, the pickling facility 1 is a facility for removing the oxide scale film on the surface of the steel strip 10. The pickling equipment 1 includes an entry side ringer roll 21, an exit side ringer roll 22, an acid wash tank 30, plate pressing rolls 41 and 42, a liquid draining roll (roll) 43, a blocking plate (blocking means) 50, and an entry side discharge tank. 61 and an outlet-side discharge tank 62.

  The pickling tank 30 is a container that is open at the top. The pickling tank 30 is filled with the pickling solution W. The steel strip 10 is passed through the pickling solution W filled in the pickling tank 30. The entrance side ringer roll 21 and the exit side ringer roll 22 are provided at positions facing each other across the pickling tank 30. The entry-side ringer roll 21 is disposed at the end of the steel strip 10 into the pickling tank 30 (hereinafter referred to as “entry side”), and the exit-side ringer roll 22 extends from the pickling tank 30 to the steel strip. 10 is disposed at the end of the side from which it is carried out (hereinafter referred to as “exit side”). The entry side ringer roll 21 includes a pair of rolls 21a. The exit side ringer roll 22 includes a pair of rolls 22a.

  The steel strip 10 is sandwiched between a pair of rolls 21 a in the entry-side ringer roll 21 at the entrance end of the pickling tank 30, and a pair of rolls in the exit-side ringer roll 22 at the exit end of the pickling tank 30. 22a. The steel strip 10 is immersed in the pickling solution W in the pickling tank 30 in a state where tension is applied between the entry side ringer roll 21 and the exit side ringer roll 22, and further from the entry side toward the exit side. Threaded horizontally.

  The plate pressing roll 41 is provided in the vicinity of the entry side end of the pickling tank 30 and presses the steel strip 10 toward the bottom surface side of the pickling tank 30 to immerse the steel strip 10 in the pickling solution W. The plate pressing roll 42 is provided in the vicinity of the central portion between the entry side and the exit side of the pickling tank 30 and presses the steel strip 10 toward the bottom surface side of the pickling tank 30 so that the steel strip 10 is pickled. Immerse in W. By providing the plate pressing rolls 41 and 42, the flapping at the time of passing the steel strip 10 is suppressed, and the stable passing of the steel strip 10 becomes possible.

  The liquid draining roll 43 is provided in the vicinity of the outlet side end portion of the pickling tank 30, and abuts rotatably on the upper surface of the steel strip 10. Here, when the steel strip 10 moves from the entrance side toward the exit side, the pickling liquid W on the upper surface side and the lower surface side of the steel strip 10 flows along the steel strip 10 from the entrance side toward the exit side. To do. The liquid draining roll 43 blocks the flow of the pickling liquid W generated on the upper surface side of the steel strip 10 as the steel strip 10 passes through. Thereby, the pickling liquid W on the upper surface of the steel strip 10 whose flow is blocked by the liquid draining roll 43 is returned into the pickling tank 30. For this reason, it is possible to prevent the pickling liquid W on the upper surface of the steel strip 10 from being taken out of the pickling tank 30 when the steel strip 10 is passed from the entry side toward the exit side. Note that a driving source is not connected to the liquid draining roll 43 and can be rotated along with the plate of the steel strip 10.

  The blocking plate 50 is disposed below the liquid draining roll 43. The upper end of the shielding plate 50 faces the lower surface of the steel strip 10. The interval between the upper end of the shielding plate 50 and the lower surface of the steel strip 10 is 10 mm or less, and the interval at which the upper end of the shielding plate 50 and the lower surface of the steel strip 10 do not contact when the steel strip 10 is passed through. And The blocking plate 50 blocks the flow of the pickling liquid W moving from the entry side to the exit side on the lower surface side of the steel strip 10 as the steel strip 10 moves from the entry side to the exit side. As shown in FIG. 2, the blocking plate 50 is fixed to the bottom plate 30 a and the side plate 30 b of the pickling tank 30 so as to stand in the pickling tank 30.

  Here, the lower part of the liquid draining roll 43 on which the blocking plate 50 is disposed is a position on the lower side of the liquid cutting roll 43, and when the blocking plate 50 is viewed from above, the blocking plate is cut by the liquid cutting roll 43. The position 50 is hidden, that is, within the range of the outer diameter (projection line) of the liquid cutting roll 43. 1 and 2 show a state in which the blocking plate 50 is disposed immediately below the rotation shaft of the liquid draining roll 43.

  In the vicinity of the inlet side end of the pickling tank 30, an inlet side weir 31 for blocking the pickling liquid W on the inlet side of the pickling tank 30 is provided. In the vicinity of the exit end of the pickling tank 30, an exit weir 32 for damming the pickling liquid W on the exit side of the pickling tank 30 is provided. A predetermined gap is provided between the upper end of the entry side weir 31 and the upper end of the exit side weir 32 and the lower surface of the steel strip 10 so that they do not contact each other.

  An inlet side discharge tank 61 for recovering the pickling liquid W discharged outside the pickling tank 30 beyond the inlet side weir 31 of the pickling tank 30 is provided in the vicinity of the inlet end on the outside of the pickling tank 30. It is done. Similarly, on the outside of the pickling tank 30, in the vicinity of the outlet side end portion, an outlet side discharge tank that collects the pickling liquid W discharged outside the pickling tank 30 beyond the outlet side weir 32 of the pickling tank 30. 62 is provided. The pickling liquid W collected by the inlet side discharge tank 61 and the outlet side discharge tank 62 is returned into the pickling tank 30 by a pump.

  The pickling equipment 1 is a jet pickling equipment. For this reason, the side part of the pickling tank 30 is provided with a nozzle for injecting the pickling liquid W toward the steel strip 10 and stirring the pickling liquid W. The nozzle is supplied with pickling liquid W and the like collected in the inlet-side discharge tank 61 and the outlet-side discharge tank 62.

  Next, the flow of the pickling liquid W moving from the entrance side to the exit side on the upper surface side and the lower surface side of the steel strip 10 with the movement of the steel strip 10 is blocked by the liquid draining roll 43 and the blocking plate 50. The configuration will be described. First, the structure which interrupts | blocks the flow of the pickling liquid W which moves the upper surface side of the steel strip 10 is demonstrated. It is assumed that the blocking plate 50 is disposed directly below the rotating shaft of the liquid draining roll 43. As shown in FIG. 3A and FIG. 3B, the flow of the pickling liquid W from the inlet side to the outlet side on the upper surface side of the steel strip 10 as the steel strip 10 moves is the liquid draining roll 43. Is blocked by. In the figure, the flow direction of the pickling liquid W is indicated by an arrow. A part of the pickling liquid W whose flow is blocked by the liquid draining roll 43 enters under the steel strip 10 from the side of the steel strip 10. The pickling liquid W that has entered under the steel strip 10 is blocked by the blocking plate 50 from flowing toward the outlet side. Thereby, it can suppress that the pickling liquid W of the upper surface side of the steel strip 10 is taken out from the exit side edge part of the pickling tank 30. FIG.

  Next, the structure which interrupts | blocks the flow of the pickling liquid W which moves the lower surface side of the steel strip 10 is demonstrated. As shown in FIG. 4A to FIG. 4C, the flow of the pickling liquid W from the entrance side to the exit side on the lower surface side of the steel strip 10 as the steel strip 10 moves is caused by the blocking plate 50. Blocked. A part of the pickling liquid W whose flow is blocked by the blocking plate 50 moves from the side of the steel strip 10 toward the upper surface of the steel strip 10 (see particularly FIG. 4C). The pickling liquid W that has moved to the upper side of the steel strip 10 is restricted from flowing to the outlet side by the liquid draining roll 43. Thereby, it can suppress that the pickling liquid W of the lower surface side of the steel strip 10 is taken out from the exit side edge part of the pickling tank 30. FIG.

  As described above, by providing the blocking plate 50 at the lower part of the liquid draining roll 43, the flow of the pickling liquid W from the inlet side to the outlet side on the upper surface side and the lower surface side of the steel strip 10 as the steel strip 10 moves. Can be cut off. Thereby, it can suppress that the pickling liquid W gets on the upper surface of the steel strip 10, and is taken out from the exit side edge part of the pickling tank 30. FIG.

  Here, for the sake of comparison, when the blocking plate 50 is installed on the outlet side of the lower part of the liquid draining roll 43, that is, when viewed from above, the blocking plate 50 is positioned on the outlet side of the liquid draining roll 43. The flow of the pickling solution W in this case will be described. First, the flow of the pickling liquid W moving on the upper surface side of the steel strip 10 will be described. As shown in FIGS. 5A and 5B, the flow of the pickling liquid W from the inlet side to the outlet side on the upper surface side of the steel strip 10 with the movement of the steel strip 10 is the liquid draining roll 43. Is blocked by. A part of the pickling liquid W whose flow is blocked by the liquid draining roll 43 enters under the steel strip 10 from the side of the steel strip 10. The pickling solution W that has entered under the steel strip 10 moves to the outlet side with the pickling solution W flowing on the lower surface side of the steel strip 10, and the flow is blocked by the blocking plate 50. Part of the pickling liquid W whose flow is blocked by the blocking plate 50 moves from the side of the steel strip 10 toward the upper surface side of the steel strip 10. The pickling liquid W that has moved to the upper surface side of the steel strip 10 is taken out of the pickling bath 30 from the exit end of the pickling bath 30 as the steel strip 10 moves.

  Next, the flow of the pickling liquid W that moves on the lower surface side of the steel strip 10 will be described. As shown in FIGS. 6A and 6B, the flow of the pickling liquid W from the entrance side to the exit side on the lower surface side of the steel strip 10 as the steel strip 10 moves is caused by the blocking plate 50. Blocked. Part of the pickling liquid W whose flow is blocked by the blocking plate 50 moves from the side of the steel strip 10 toward the upper surface side of the steel strip 10. The pickling liquid W that has moved to the upper side of the steel strip 10 is taken out of the pickling bath 30 from the outlet end of the pickling bath 30 as the steel strip 10 moves.

  Thus, when the blocking plate 50 is installed on the outlet side from the lower part of the liquid draining roll 43, the pickling liquid W riding on the upper surface of the steel strip 10 moves along with the movement of the steel strip 10. Therefore, the discharge amount of the pickling liquid W cannot be suppressed.

  Further, when the blocking plate 50 is installed on the inlet side from the lower part of the liquid draining roll 43, that is, when the blocking plate 50 is positioned on the inlet side of the liquid draining roll 43 when viewed from above, the pickling liquid W The flow of First, the flow of the pickling liquid W moving on the upper surface side of the steel strip 10 will be described. As shown in FIGS. 7A and 7B, the flow of the pickling liquid W from the inlet side to the outlet side on the upper surface side of the steel strip 10 as the steel strip 10 moves is the liquid draining roll 43. Is blocked by. A part of the pickling liquid W whose flow is blocked by the liquid draining roll 43 enters under the steel strip 10 from the side of the steel strip 10. The pickling liquid W that has entered under the steel strip 10 flows from the entrance side to the exit side of the bottom surface side of the steel strip 10, and a part of the pickling solution W extends from the side of the steel strip 10 to the upper surface side of the steel strip 10. Move towards The pickling liquid W that has moved to the upper surface side of the steel strip 10 is taken out of the pickling bath 30 from the exit end of the pickling bath 30 as the steel strip 10 moves.

  Next, the flow of the pickling liquid W that moves on the lower surface side of the steel strip 10 will be described. As shown in FIG. 8A and FIG. 8B, the flow of the pickling liquid W from the entrance side to the exit side on the lower surface side of the steel strip 10 as the steel strip 10 moves is blocked by the blocking plate 50. Blocked. Part of the pickling liquid W whose flow is blocked by the blocking plate 50 moves from the side of the steel strip 10 toward the upper surface side of the steel strip 10. The pickling liquid W that has moved to the upper surface side of the steel strip 10 flows from the inlet side to the outlet side together with the pickling liquid W that flows on the upper surface side of the steel strip 10. Thereafter, as described with reference to FIGS. 7 (a) and 7 (b), the pickling liquid W moved from the lower surface side to the upper surface side of the steel strip 10 by being blocked by the blocking plate 50, The flow is cut off by the liquid draining roll 43, so that a part of the liquid sinks under the steel strip 10. Further, the pickling solution W that has entered under the steel strip 10 flows from the entrance side to the exit side of the bottom surface of the steel strip 10, and a part of the pickling solution W from the side of the steel strip 10. Move toward the top side. The pickling liquid W that has moved to the upper surface side of the steel strip 10 is taken out of the pickling bath 30 from the exit end of the pickling bath 30 as the steel strip 10 moves.

  In this way, when the blocking plate 50 is installed on the entry side with respect to the lower part of the liquid draining roll 43, the pickling liquid W riding on the upper surface of the steel strip 10 is pickled as the steel strip 10 moves. It will be taken out from the edge part of the exit side of 30, and the discharge amount of the pickling liquid W cannot be suppressed.

  Moreover, the flow of the pickling liquid W when the blocking plate 50 is not installed will be described. First, the flow of the pickling liquid W moving on the upper surface side of the steel strip 10 will be described. As shown in FIGS. 9A and 9B, the flow of the pickling liquid W from the entrance side to the exit side on the upper surface side of the steel strip 10 as the steel strip 10 moves is the liquid draining roll 43. Is blocked by. A part of the pickling liquid W whose flow is blocked by the liquid draining roll 43 enters under the steel strip 10 from the side of the steel strip 10. The pickling solution W that has entered under the steel strip 10 flows along with the pickling solution W that flows on the lower surface side of the steel strip 10 so as to pass through the lower position of the draining roll 43 from the entry side to the exit side. To do. Part of the pickling liquid W that has passed through the lower position of the liquid draining roll 43 moves from the side of the steel strip 10 to the upper surface side of the steel strip 10. The pickling liquid W that has moved to the upper surface side of the steel strip 10 is taken out of the pickling bath 30 from the exit end of the pickling bath 30 as the steel strip 10 moves.

  Next, the flow of the pickling liquid W that moves on the lower surface side of the steel strip 10 will be described. As shown in FIGS. 9A and 9B, the pickling liquid W flows from the entry side to the exit side on the lower surface side of the steel strip 10 as the steel strip 10 moves. Of the pickling solution W flowing on the lower surface side of the steel strip 10, the flow of the pickling solution W moved to the upper surface side of the steel strip 10 at the position on the entry side of the liquid cutting roll 43 is as described above. It is blocked by the roll 43. Among the pickling liquid W flowing on the lower surface side of the steel strip 10, the pickling liquid W that has moved to the upper surface side of the steel strip 10 at the position on the outlet side from the liquid draining roll 43 is accompanied by the movement of the steel strip 10. The pickling tank 30 is taken out from the end of the pickling tank 30 to the outside. Further, the pickling liquid W flowing on the lower surface side of the steel strip 10 at the position on the outlet side from the liquid draining roll 43 is moved to the outlet side of the pickling tank 30 on the lower surface of the steel strip 10 as the steel strip 10 moves. It is taken out of the pickling tank 30 from the end portion.

  Thus, when the shielding plate 50 is not installed, the pickling liquid W on the upper surface side and the lower surface side of the steel strip 10 is taken out of the pickling tank 30 with the movement of the steel strip 10, and the acid The discharge amount of the washing liquid W cannot be suppressed.

  Hereinafter, in the case where the above-described blocking plate 50 is installed directly below the liquid draining roll 43, the acid that is taken out of the pickling tank 30 from the outlet end of the pickling tank 30 and discharged to the outlet discharge tank 62. The measurement result of the peak value of the outflow amount of the washing liquid W will be described with reference to FIG. Here, the cut-off plate 50 is installed immediately below the liquid draining roll 43, and each pickling solution in the case where the steel strip 10 is passed through the pickling tank 30 at 280 mpm, 350 mpm, and 420 mpm (with a cut-off plate). The peak value of the outflow amount of W was measured. For comparison, the outflow of each pickling solution W when the steel strip 10 is passed through the pickling tank 30 at 280 mpm, 350 mpm, and 420 mpm without the shielding plate 50 (without the shielding plate). The peak value of the quantity was measured. In FIG. 10, the peak value of the outflow amount of the pickling liquid W in the case where the blocking plate 50 is not installed and the sheet feeding speed of the steel strip 10 is 280 mpm is used as a reference (100%). The ratio (peak outflow rate) of the peak value of the outflow amount of the pickling liquid W in the case is shown.

  As a result of the measurement, as shown in FIG. 10, when the plate passing speed of the steel strip 10 is 280 mpm, by installing the blocking plate 50, the steel plate 10 flows out to the outlet discharge tank 62 as compared with the case where the blocking plate 50 is not installed. The maximum outflow rate of the pickling liquid W was reduced by 2.3%. When the plate speed of the steel strip 10 is 350 mpm, the maximum outflow rate of the pickling liquid W flowing out to the outlet side discharge tank 62 is 10 by installing the blocking plate 50 compared to the case where the blocking plate 50 is not installed. Reduced by 5%. When the plate speed of the steel strip 10 is 420 mpm, the maximum outflow rate of the pickling liquid W flowing out to the outlet side discharge tank 62 is 8 by installing the blocking plate 50 as compared with the case where the blocking plate 50 is not installed. Reduced by 5%.

  Thus, by installing the blocking plate 50, the outflow amount of the pickling liquid W flowing out to the outlet side discharge tank 62 is reduced as compared with the case where the blocking plate 50 is not installed. Moreover, the reduction effect of the outflow amount of the pickling liquid W by having installed the shielding board 50 became large in the high speed region whose plate passing speed of the steel strip 10 is 350 mpm or more.

  Next, when the installation position of the blocking plate 50 is changed, the outflow of the pickling liquid W taken out of the pickling tank 30 from the outlet end of the pickling tank 30 and discharged to the outlet discharge tank 62 The measurement result of the peak value of quantity will be described with reference to FIG. Here, the measurement was performed using a liquid cutting roll 43 having a diameter of 318 mm and a plate plate speed of the steel strip 10 of 420 mpm. Further, when the blocking plate 50 is installed directly below the rotating shaft of the liquid draining roll 43 (distance 0 mm from the center of the liquid cutting roll 43), the blocking plate is located at a position of 185 mm from the position immediately below the rotating shaft of the liquid cutting roll 43 to the outlet side. 50 is installed (distance from the center of the liquid draining roll 43 is 185 mm), and the shielding plate 50 is installed at a position of 395 mm from the position just below the rotation axis of the liquid draining roll 43 (distance from the center of the liquid draining roll 43). 395 mm), when the blocking plate 50 is installed at a position of 185 mm on the entry side from directly below the rotation axis of the liquid draining roll 43 (distance from the center of the liquid draining roll 43 -185 mm), from directly below the rotation axis of the liquid draining roll 43 The peak value of the outflow amount of the pickling liquid W was measured when the blocking plate 50 was installed at a position of 395 mm on the entry side (distance from the center of the liquid draining roll 43 -395 mm). In FIG. 11, the peak value of the outflow amount of the pickling liquid W in the case where the blocking plate 50 is not installed and the sheet feeding speed of the steel strip 10 is 280 mpm is used as a reference (100%). The ratio (peak outflow rate) of the peak value of the outflow amount of the pickling liquid W in the case is shown.

  As a result of the measurement, as shown in FIG. 11, the shielding plate 50 is installed in the lower part of the liquid draining roll 43 (a position where the shielding plate 50 is hidden by the liquid draining roll 43 when the shielding plate 50 is viewed from above). In this case, the maximum outflow rate of the pickling liquid W flowing out to the outlet side discharge tank 62 can be effectively reduced as compared with the case where the blocking plate 50 is not installed. In particular, when the blocking plate 50 is installed immediately below the rotating shaft of the liquid draining roll 43, the maximum outflow rate of the pickling liquid W flowing out to the outlet side discharge tank 62 is the smallest compared with the case where the blocking plate 50 is not installed. It was done.

  Next, when the distance between the lower surface of the steel strip 10 and the upper end of the blocking plate 50 is changed, the steel strip 10 is taken out of the pickling tank 30 and discharged to the outlet discharge tank 62. The measurement result of the peak value of the outflow amount of the pickling solution W will be described with reference to FIG. Here, the measurement was performed at a plate passing speed of the steel strip 10 of 420 mpm. Further, when the gap between the lower surface of the steel strip 10 and the blocking plate 50 is 0 mm, the gap is 5 mm, the gap is 10 mm, and the gap is 20 mm, the peak of the outflow amount of the pickling liquid W The value was measured. In FIG. 12, the peak value of the outflow amount of the pickling liquid W in the case where the blocking plate 50 is not installed and the sheet feeding speed of the steel strip 10 is 280 mpm is used as a reference (100%). The ratio (peak outflow rate) of the peak value of the outflow amount of the pickling liquid W in the case is shown.

  As a result of the measurement, as shown in FIG. 12, when the gap between the lower surface of the steel strip 10 and the shielding plate 50 is 10 mm or less, the pickling that flows out to the outlet discharge tank 62 as compared with the case where the shielding plate 50 is not installed. The maximum outflow rate of the liquid W was reduced.

  The present embodiment is configured as described above, and the blocking plate 50 is disposed below the liquid draining roll 43. As a result, the flow of the pickling liquid W from the entrance side to the exit side of the pickling tank 30 with the movement of the steel strip 10 on the upper surface side of the steel strip 10 is blocked by the liquid draining roll 43. Further, the flow of the pickling liquid W from the entrance side to the exit side of the pickling tank 30 with the movement of the steel strip 10 on the lower surface side of the steel strip 10 is blocked by the blocking plate 50. In this way, the flow of the pickling liquid W moving toward the exit side of the pickling tank 30 can be interrupted on both the upper surface side and the lower surface side of the steel strip 10, for example, Even if the plate speed of the steel strip 10 is increased, for example, the plate speed is 350 mpm or more, the discharge amount of the pickling liquid W can be further reduced.

  A blocking plate 50 is used as blocking means for blocking the flow of the pickling liquid W on the lower surface side of the steel strip 10. Moreover, the space | interval between the upper end of the shielding board 50 and the lower surface of the steel strip 10 shall be 10 mm or less. In this case, the flow of the pickling liquid W from the entrance side to the exit side of the pickling tank 30 that is accompanied by the movement of the steel strip 10 on the lower surface side of the steel strip 10 is effectively blocked by the blocking plate 50. be able to. Thereby, the discharge amount of the pickling liquid W can be further reduced.

  The liquid draining roll 43 rotates as the steel strip 10 moves, so that the steel strip 10 is less likely to be wrinkled. Moreover, the flow of the pickling liquid W which moves with the movement of the steel strip 10 on the upper surface side of the steel strip 10 can be interrupted.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment. For example, although the jet-type pickling equipment is used as the pickling equipment 1, the pickling equipment is not limited to the jet-type, and other pickling equipment may be used.

  The blocking plate 50 is fixed to the bottom plate 30a and the side plate 30b (see FIG. 2), but may be fixed to either the bottom plate 30a or the side plate 30b. Further, as long as the flow of the pickling liquid W can be blocked more than a predetermined value, a gap may be provided between at least one of the bottom plate 30a and the side plate 30b and the blocking plate 50, A hole may be provided in the blocking plate 50. Further, the blocking plate 50 is not limited to a plate shape but may be a block shape. Further, a plurality of blocking plates 50 may be provided.

  The entrance side weir 31 and the exit side weir 32 may be a weir capable of adjusting the height. Moreover, although the plate pressing roll 41 and the plate pressing roll 42 are provided in the pickling equipment 1, these may not be provided.

  DESCRIPTION OF SYMBOLS 1 ... Pickling equipment, 10 ... Steel strip, 30 ... Pickling tank, 43 ... Liquid draining roll (roll), 50 ... Blocking board (blocking means), W ... Pickling liquid.

Claims (3)

The steel strip is passed through the pickling tank, and the steel strip is dipped in the pickling solution in the pickling tank,
A roll that rotatably contacts the upper surface of the steel strip in the pickling tank;
A blocking means arranged at the lower part of the roll in the pickling tank, and blocking the flow of the pickling solution on the lower surface side of the steel strip;
Pickling equipment equipped with. The blocking means is a blocking plate;
The distance between the upper end of the shielding plate and the steel strip is 10 mm or less.
The pickling equipment according to claim 1.   The pickling facility according to claim 1 or 2, wherein the roll rotates as the steel strip moves.

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