JP5904177B2 - Steel plate continuous cleaning apparatus and continuous cleaning method - Google Patents

Description

  The present invention relates to a steel plate continuous cleaning apparatus and a continuous cleaning method for removing rolling oil and machine oil adhering to the front and back surfaces of a steel plate before annealing treatment and plating treatment.

  For example, a cold-rolled steel sheet is passed through a continuous annealing line or continuous hot-dip galvanizing line in steel. Rolling oil and machine oil are attached to the front and back surfaces of these cold-rolled steel sheets, and if these treatments are performed with annealing or plating, the equipment or the steel sheet itself is damaged due to steel sheet slip, Deterioration of product value due to contamination of equipment due to residual oil and contamination of the steel sheet surface occurs. Therefore, it is necessary to remove these remaining oil before annealing and plating.

  Conventionally, as a method for continuously cleaning a steel sheet, a method has been proposed in which the steel sheet is immersed in an alkaline aqueous solution, immersed in an alkaline electrolytic solution, and brushing associated therewith. However, this method has a problem that it is difficult to speed up the line because it is necessary to immerse the steel plate in the cleaning solution for a certain period of time. Further, since an alkaline solution is used as the cleaning liquid, the waste liquid treatment is necessary. Further, since the cleaning liquid is used for a certain period, there is a problem that the cleaning ability is reduced along with the contamination of the solution. Further, in the electrolytic cleaning line, since the alkaline electrolytic solution is electrolyzed, there is a problem that a large amount of bubbles are generated in the alkaline electrolytic solution and the working environment is deteriorated.

  Therefore, a method of shot blasting dry ice on a steel sheet has been proposed (for example, Patent Document 1). In this method, dry ice is shot blasted on the surface of a steel sheet, and the oil component is solidified at a low temperature to remove and remove. Moreover, the method of spraying high temperature steam on a steel plate and brushing after that is proposed (for example, patent document 2). Furthermore, a method has been proposed in which residual oil is removed by a roll or air blow after oil is sprayed onto the surface of a steel plate with a high pressure nozzle (for example, Patent Document 3).

Japanese Patent Laid-Open No. 11-50284 JP 2007-246936 A JP-A-7-155824

  However, in the method of Patent Document 1, since solid dry ice collides with the steel sheet, there is a possibility that scratches may occur on the surface of the steel sheet. Further, since the processing consumes a large amount of dry ice, there is a problem that the running cost increases. Further, this method has a problem that since the solid is sprayed, the surface is likely to be uneven, and the oil cannot be completely removed. In the method of Patent Document 2, moisture remains on the surface of the steel plate after brushing, so that rust is likely to be generated on the surface of the steel plate. Therefore, there is a problem that it is necessary to add a drying process of the steel plate after brushing. Furthermore, the method described in Patent Document 3 has a problem in that a large amount of oil temporarily adheres to the surface, so that the roll cleaning cycle is short and the running cost is increased. Moreover, since a large amount of oil adheres, there is a problem that a small amount of oil remains on the surface.

  The present invention has been made in view of such circumstances, and can remove oil all over the entire steel sheet without scratching the steel sheet, eliminating the need for additional steps and reducing running costs. It is an object of the present invention to provide a continuous cleaning apparatus and a continuous cleaning method for a steel sheet.

  In order to solve the above problems, the present invention provides the following (1) to (8).

(1) A continuous cleaning device for a steel plate that continuously cleans oil consisting of rolling oil or machine oil adhering to both surfaces of a continuously running steel plate,
A mediator supply unit for supplying ultrasonic mediators to both sides of the traveling steel plate;
Ultrasonic application means for applying cavitation treatment by applying ultrasonic waves to the both surfaces of the traveling steel plate via the mediator;
Sandwiching both sides of the traveling steel plate after the cavitation treatment, an absorption roll unit having an absorption roll that absorbs oil and moisture of the steel plate;
A continuous cleaning apparatus for steel sheets, comprising:

  (2) The continuous cleaning apparatus for steel sheets according to (1) above, wherein the frequency of ultrasonic waves applied to the steel sheet traveling by the ultrasonic wave applying means is 100 kHz or less.

  (3) The absorbent roll includes a tubular roll shaft having a large number of pores, and a barrel portion formed of an elastic nonwoven sheet material having liquid absorbency provided outside the roll shaft, The absorption roll unit further includes a suction pipe connected to the roll shaft, and a vacuum pump for making a negative pressure in the roll shaft through the suction pipe. A continuous cleaning apparatus for steel sheets according to 1.

  (4) The continuous cleaning apparatus for a steel sheet according to any one of (1) to (3), wherein the mediating substance supply unit and the ultrasonic wave applying unit are provided as one apparatus.

(5) A continuous cleaning method for a steel sheet that continuously cleans the oil component composed of rolling oil or machine oil adhering to both surfaces of a continuously traveling steel sheet,
Supplying ultrasonic mediators to both sides of the running steel plate,
Cavitation treatment is performed by applying ultrasonic waves to both sides of the traveling steel plate via a mediator.
A method for continuously cleaning a steel sheet, wherein both surfaces of the traveling steel sheet after the cavitation treatment are sandwiched between absorption rolls to absorb oil and moisture on the surface of the steel sheet.

  (6) The continuous cleaning method for a steel sheet according to (5) above, wherein the frequency of ultrasonic waves applied to the steel sheet is 100 kHz or less.

  (7) The absorbent roll includes a tubular roll shaft having a large number of pores, and a barrel portion formed of an elastic non-woven sheet material having liquid absorbability provided outside the roll shaft, and a vacuum. The method for continuously cleaning steel sheets according to (5) or (6) above, wherein the oil absorbed in the absorbing roll is sucked by applying a negative pressure in the roll shaft by a pump.

  (8) The continuous cleaning method for a steel sheet according to any one of (5) to (7) above, wherein a cavitation treatment is performed by supplying a mediator to which ultrasonic waves are applied to both surfaces of the traveling steel sheet.

According to the present invention, by supplying the mediator relative to both surfaces of a steel sheet continuously traveling, performs cavitation process by applying ultrasonic waves through the mediator on both surfaces of the steel sheet, rolling oil adheres to both surfaces of the steel sheet or Easily remove the oil component consisting of machine oil , and then hold the steel plate with an absorption roll and reduce it to absorb oil and moisture with the absorption roll, so that the steel plate is scratched like when solid is blown. In addition, the oil does not remain due to unevenness on the surface and the oil does not remain, and the oil can be removed throughout the entire steel sheet. In addition, since the ultrasonic wave is applied to the steel plate via a mediator, and the oil and moisture on both sides of the steel plate are then absorbed by the absorption roll, the running cost does not increase. Furthermore, since not only oil on the surface of the steel sheet but also moisture can be absorbed by the absorption roll, an additional step such as a drying step is not required.

  Furthermore, the absorption roll unit has a vacuum pump in addition to the absorption roll, and by sucking the oil and water absorbed by the absorption roll, the absorption roll can be prevented from being saturated with water and oil. . For this reason, it is not necessary to replace the absorbent roll except when the roll is worn, and it can be used semipermanently without any functional deterioration, and the running cost can be greatly reduced.

1 is a side view showing a continuous cleaning apparatus according to a first embodiment of the present invention. It is a front view which shows the continuous washing apparatus which concerns on the 1st Embodiment of this invention. It is a side view which shows the continuous washing apparatus which concerns on the 2nd Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
[First Embodiment]
First, a first embodiment of the present invention will be described.
FIG. 1 is a side view showing a steel plate continuous cleaning apparatus according to a first embodiment of the present invention, and FIG. 2 is a front view thereof.

  The steel plate continuous cleaning apparatus 10 of the present embodiment is installed in, for example, an annealing line, and continuously cleans oil adhering to both surfaces of the cold-rolled steel plate 11 running continuously by a transport mechanism of the annealing line before annealing treatment. There is a water feeder (mediator material supply unit) 4 for supplying water as an ultrasonic wave medium on both surfaces of the traveling cold-rolled steel sheet 11, and ultrasonic waves are applied to both surfaces of the cold-rolled steel sheet 11 via the medium. An ultrasonic generator 1 as an ultrasonic wave application means for performing cavitation treatment, a ringer roll 2 for sandwiching a traveling cold-rolled steel plate 11 and roughly removing moisture and oil from the surface of the cold-rolled steel plate after cavitation treatment, and a ringer An absorbent roll unit 5 having an absorbent roll 3 that sandwiches both surfaces of the cold-rolled steel sheet 11 that has traveled after passing through the roll 2 and absorbs moisture and oil content of the cold-rolled steel sheet 11 is provided.

  The ultrasonic generator 1 includes a header portion 1a that is provided on both sides of the cold-rolled steel plate 11 and generates ultrasonic vibration, and a horn portion 1b that amplifies the ultrasonic vibration of the header portion 1a. Ultrasonic waves are transmitted to both surfaces of the cold-rolled steel sheet 11 through water serving as a mediator supplied from the water feeder 4, and cavitation is generated to facilitate removal of oil on the surface of the cold-rolled steel sheet. . A plurality of header portions 1 a and horn portions 1 b are provided at substantially equal intervals along the width direction of the cold-rolled steel plate 11. Moreover, as for the ultrasonic generator 1 and the water feeder 4, the row | line | column arrange | positioned in the width direction of the cold-rolled steel plate 11 may be arranged in multiple rows in the advancing direction of the cold-rolled steel plate 11 as needed.

  The ringer roll 2 has a surface made of a soft elastic body such as rubber, and is rotated by a drive mechanism (not shown) in contact with the cold-rolled steel sheet 11 to cause moisture on both sides of the cold-rolled steel sheet 11 after cavitation treatment. And roughly remove oil.

  The absorbent roll 3 includes a barrel portion 3a formed of an elastic nonwoven sheet material having liquid absorbability and a tubular roll shaft 3b having a large number of pores, and the roll shaft 3b penetrates the barrel portion 3a. The structure is attached. And by rotating by the drive mechanism 9 in the state which rolled down the cold-rolled steel plate 11 with the absorption roll 3 (barrel part 3a), the water | moisture content and oil component of both surfaces of the cold-rolled steel plate 11 are absorbed by the barrel part 3a by a capillary phenomenon. It is like that.

  The absorption roll unit 5 includes, in addition to the absorption roll 3, a suction pipe 6 connected to the roll shaft 3 b via the rotary joint 8, and a vacuum pump 7 that applies a negative pressure to the roll shaft 3 b via the suction pipe 6. Is further provided. And it is possible to make the inside of the roll axis | shaft 3b into a negative pressure by carrying out vacuum suction with the vacuum pump 7. FIG. Therefore, by operating the vacuum pump 7, the moisture and oil absorbed by the barrel portion 3 a are sucked into the roll shaft 3 b having a negative pressure through the pores of the roll shaft 3 b, and further through the suction pipe 6. It is discharged out of the system.

Next, a cleaning process operation in such a continuous cleaning apparatus will be described.
In the annealing line, the cold-rolled steel sheet 11 continuously runs in the direction of the arrow in FIG. At this time, generally, rolling oil or machine oil adheres to the front and back surfaces of the cold-rolled steel sheet 11 during the manufacturing process. For this reason, the cold-rolled steel sheet 11 is continuously cleaned by the continuous cleaning apparatus 10 prior to the annealing treatment.

  In the continuous cleaning apparatus 10, water is first supplied from the water feeder 4 to both surfaces of the traveling cold-rolled steel sheet 11 as a medium for the traveling cold-rolled steel sheet 11, and is an ultrasonic wave application unit. The generator 1 makes it easy to remove oil from the surface of the cold-rolled steel sheet 11 by applying ultrasonic waves to both surfaces of the traveling cold-rolled steel sheet 11 through a mediator to perform cavitation treatment.

  Specifically, the ultrasonic wave generated from the header part 1a of the ultrasonic generator 1 and amplified by the horn part 1b is transmitted to the cold-rolled steel sheet 11 using water supplied from the water feeder 4 as a medium. Thereby, ultrasonic waves are applied to both surfaces of the cold rolled steel sheet 11. At this time, countless gas molecules exist in the water, which is a mediator, and these gas molecules form bubbles. Furthermore, these bubbles repeatedly contract and expand by ultrasonic energy. Eventually, these bubbles burst, generating a very large impact force called cavitation. Residual oil adhering to the surface of the cold-rolled steel sheet 11 is easily removed by the impact force due to the cavitation. In order to generate cavitation, an ultrasonic intensity (sound pressure) of a certain level or higher is required depending on the oscillation frequency. Generally, cavitation occurs with lower ultrasonic intensity (sound pressure) at lower frequencies, and when it exceeds 100 kHz, the ultrasonic intensity (sound pressure) necessary for cavitation generation increases at an accelerated rate. Therefore, it is preferable that the frequency of the ultrasonic wave given to the cold-rolled steel sheet 11 is 100 kHz or less from the viewpoint of energy consumption and apparatus size. Moreover, in order to make the action of cavitation effective, a sufficient amount of water is supplied over the entire width of the cold rolled steel sheet 11.

  The cold-rolled steel sheet 11 after such a cavitation treatment is sandwiched between ringer rolls 2 rotated by a drive mechanism (not shown), and moisture and oil present on both sides thereof are roughly removed. At this time, it is desirable that the peripheral speed of the ringer roll 2 is synchronized with the plate speed of the cold-rolled steel sheet 11 that is running.

  Next, the cold-rolled steel sheet 11 from which the surface moisture and oil are roughly removed is conveyed to the absorption roll 3. The absorbing roll 3 is rotated by the drive mechanism 9 in a state where the cold-rolled steel sheet 11 is sandwiched and pressed, and absorbs moisture and oil remaining on both surfaces of the cold-rolled steel sheet 11. At this time, it is desirable that the peripheral speed of the absorbing roll 3 is synchronized with the speed of the cold-rolled steel sheet 11 that is running. Moreover, it is preferable that the reduction | decrease in the absorption roll 3 is a light reduction with a linear pressure of 8-10 kg / cm.

  Specifically, the barrel portion 3a formed of the elastic nonwoven sheet material of the absorbent roll 3 presses both surfaces of the cold-rolled steel plate 11, whereby the moisture and oil on both surfaces of the cold-rolled steel plate 11 are caused by the capillary phenomenon to cause the barrel portion 3a. And is removed from the cold-rolled steel sheet 11.

  In this case, the absorption roll unit 5 further includes a suction pipe 6 connected to the roll shaft 3b via the rotary joint 8, and a vacuum pump 7 for making the pressure inside the roll shaft 3b negative via the suction pipe 6. Therefore, it is possible to make the inside of the roll shaft 3b a negative pressure by performing vacuum suction with the vacuum pump 7. Therefore, by operating the vacuum pump 7, the moisture and oil absorbed by the barrel portion 3a are sucked into the roll shaft 3b having a negative pressure through the pores of the roll shaft 3b, and further sucked from the roll shaft 3b. It is discharged out of the system through the pipe 6. This prevents the absorption roll 3 (barrel portion 3a) from being saturated with moisture and oil.

  As described above, in this embodiment, water that is an ultrasonic medium is supplied to both surfaces of the cold-rolled steel sheet 11 that continuously travels by the water feeder 4, and the ultrasonic generator 1 applies both surfaces of the cold-rolled steel sheet 11. On the other hand, the ultrasonic wave is applied through water as a mediator to perform cavitation treatment to facilitate the removal of oil adhering to both surfaces of the cold-rolled steel sheet 11, and then the cold-rolled steel sheet 11 is sandwiched between the absorption rolls 3, By reducing, moisture and oil are absorbed by the barrel portion 3a of the absorbent roll 3. For this reason, as in the case of spraying solids, the steel sheet is not damaged or uneven on the surface and oil does not remain, and the oil can be removed throughout the cold-rolled steel sheet 11. Moreover, since ultrasonic waves are applied to the cold-rolled steel sheet 11 through water as a mediator, and the oil and moisture on both sides of the cold-rolled steel sheet 11 are then absorbed by the absorption roll, the running cost is increased. There is no. Furthermore, since not only the oil component on the surface of the cold-rolled steel sheet 11 but also moisture can be absorbed by the absorbing roll 3, no additional process such as a drying process is required.

  Further, the absorption roll unit 5 has a vacuum pump 7 in addition to the absorption roll 3 and sucks oil and moisture absorbed in the barrel portion 3a of the absorption roll 3, so that the barrel portion 3a is saturated with moisture and oil. Can be prevented. For this reason, the absorption roll 3 does not need to be replaced except when the roll is worn, and can be used semipermanently without any functional deterioration, and the running cost can be made very low.

[Second Embodiment]
Next, a second embodiment of the present invention will be described.
FIG. 3 is a side view showing a steel sheet continuous cleaning apparatus according to the second embodiment of the present invention. The continuous cleaning apparatus 20 of the steel plate according to the present embodiment has functions of a mediating substance supply unit and an ultrasonic application unit, instead of providing the water supply 4 as an intermediary substance supply unit and the ultrasonic generator 1 as an ultrasonic application unit. Only the point which has the ultrasonic water injection apparatus 22 which combines is different from 1st Embodiment. For this reason, the same code | symbol is attached | subjected to the same thing as 1st Embodiment, and description is abbreviate | omitted.

  The ultrasonic water injection device 22 includes a water supply unit 22a as a medium supply unit and a cavitation nozzle 22b as an ultrasonic wave application unit. That is, the mediating substance supply unit and the ultrasonic wave applying means are provided as one apparatus. A plurality of water supply portions 22 a and cavitation nozzles 22 b are provided at substantially equal intervals along the width direction of the cold-rolled steel plate 11. Moreover, as for the ultrasonic water injection apparatus 22, the row | line | column arrange | positioned in the width direction of the cold-rolled steel plate 11 may be arranged in multiple rows in the advancing direction of the cold-rolled steel plate 11 as needed.

  In the ultrasonic water injection device 22, water as a mediator supplied from the water supply unit 22a is injected at a high pressure in a state where ultrasonic waves are applied from the cavitation nozzle 22b. When this ultrasonic water collides with the cold-rolled steel sheet 11, cavitation occurs on the surface of the cold-rolled steel sheet 11, and the cavitation treatment is performed as in the first embodiment. Thereby, the oil component on the surface of the cold-rolled steel sheet 11 is easily removed. Also in this embodiment, it is preferable that the frequency of the ultrasonic wave given to the cold-rolled steel sheet 11 is 100 kHz or less as in the first embodiment.

  Since the continuous cleaning apparatus 20 for the steel plate of the present embodiment has the ultrasonic water injection device 22 that has both the functions of the mediator supply unit and the ultrasonic wave imparting means, the ultrasonic generator 1 and the water feeder 4 are provided. Cavitation treatment is performed by applying ultrasonic waves to both surfaces of the traveling cold-rolled steel sheet 11 through water as a medium with a simpler mechanism than the continuous cleaning apparatus 10 according to the first embodiment having separate apparatuses. Can do. However, the frequency of the ultrasonic wave needs to be a size that can be applied to the water to be jetted. Further, the cavitation ability is larger in the first embodiment.

  After making it easy to remove oil from the surface of the cold-rolled steel sheet 11 by cavitation in this way, the water and oil present on both surfaces of the cold-rolled steel sheet 11 are roughly removed by the ringer roll 2 as in the first embodiment. Subsequently, moisture and oil on both surfaces of the cold-rolled steel sheet 11 are absorbed by the absorption roll 3. At this time, as in the first embodiment, it is desirable that the peripheral speeds of the ringer roll 2 and the absorption roll 3 are synchronized with the plate speed of the cold-rolled steel sheet 11 that is running, and the reduction in the absorption roll 3 is It is preferable that the pressure is light under a linear pressure of 8 to 10 kg / cm. Further, similarly to the first embodiment, by operating the vacuum pump 7, the moisture and oil absorbed in the barrel portion 3 a are moved into the roll shaft 3 b that has become negative pressure through the pores of the roll shaft 3 b. Then, the absorption roll 3 (barrel portion 3a) is prevented from being saturated with moisture and oil by being discharged out of the system through the suction pipe 6 from the roll shaft 3b.

  Accordingly, in the second embodiment, as in the case of the first embodiment, the steel sheet is not scratched or the surface is uneven as in the case of spraying a solid, and the oil does not remain and the cold rolled steel sheet. The oil can be removed all over 11. Moreover, since ultrasonic waves are applied to the cold-rolled steel sheet 11 through water as a mediator, and the oil and moisture on both sides of the cold-rolled steel sheet 11 are then absorbed by the absorption roll, the running cost is increased. There is no. Furthermore, since not only the oil component on the surface of the cold-rolled steel sheet 11 but also moisture can be absorbed by the absorbing roll 3, no additional process such as a drying process is required. Furthermore, since the oil and moisture absorbed by the barrel 3a of the absorption roll 3 are sucked by the vacuum pump 7, it is possible to prevent the barrel 3a from being saturated with moisture and oil. For this reason, the absorption roll 3 does not need to be replaced except when the roll is worn, and can be used semipermanently without any functional deterioration, and the running cost can be made very low.

  The present invention is not limited to the above embodiment, and various modifications can be made. For example, in the above embodiment, water is used as a mediator for applying ultrasonic waves, but warm water may be used. Moreover, not only water but substances other than water, such as organic liquids, such as alcohol, can also be used. Further, the ringer roll 2 is not necessarily essential, and the cold-rolled steel sheet 11 may be directly conveyed to the absorption roll 3 after performing the cavitation treatment. Alternatively, a device such as a wiper may be used instead of the ringer roll. Furthermore, although the cold-rolled steel plate was demonstrated as an example as a steel plate, a steel plate is not restricted to a cold-rolled steel plate.

1 Ultrasonic generator (Ultrasonic wave applying means)
DESCRIPTION OF SYMBOLS 1a Header part 1b Horn part 2 Ringer roll 3 Absorption roll 3a Barrel part 3b Roll axis | shaft 4 Water feeder (medium supply part)
DESCRIPTION OF SYMBOLS 5 Absorption roll unit 6 Absorption piping 7 Vacuum pump 8 Rotary joint 9 Drive mechanism 10,20 Continuous washing apparatus 11 Cold-rolled steel plate 22 Ultrasonic water injection apparatus (medium supply part + ultrasonic provision means)
22a Water supply part 22b Cavitation nozzle

Claims (8)

A steel plate continuous cleaning device that continuously cleans oil consisting of rolling oil or machine oil adhering to both surfaces of a continuously traveling steel plate,
A mediator supply unit for supplying ultrasonic mediators to both sides of the traveling steel plate;
Ultrasonic application means for applying cavitation treatment by applying ultrasonic waves to the both surfaces of the traveling steel plate via the mediator;
Sandwiching both sides of the traveling steel plate after the cavitation treatment, an absorption roll unit having an absorption roll that absorbs oil and moisture of the steel plate;
A continuous cleaning apparatus for steel sheets, comprising:   The continuous cleaning apparatus for steel sheets according to claim 1, wherein the frequency of ultrasonic waves applied to the steel sheet traveling by the ultrasonic wave applying means is 100 kHz or less.   The absorbent roll unit includes a tubular roll shaft having a large number of pores, and a barrel portion formed of an elastic non-woven sheet material having liquid absorbability provided outside the roll shaft. The steel plate according to claim 1 or 2, further comprising: a suction pipe connected to the roll shaft; and a vacuum pump for making a negative pressure in the roll shaft through the suction pipe. Continuous cleaning equipment.   The continuous cleaning apparatus for steel sheets according to any one of claims 1 to 3, wherein the mediating substance supply unit and the ultrasonic wave applying means are provided as one apparatus. A continuous cleaning method for a steel sheet that continuously cleans an oil component consisting of rolling oil or machine oil adhering to both surfaces of a continuously traveling steel sheet,
Supplying ultrasonic mediators to both sides of the running steel plate,
Cavitation treatment is performed by applying ultrasonic waves to both sides of the traveling steel plate via a mediator.
A method for continuously cleaning a steel sheet, wherein both surfaces of the traveling steel sheet after the cavitation treatment are sandwiched between absorption rolls to absorb oil and moisture on the surface of the steel sheet.   The continuous cleaning method for a steel sheet according to claim 5, wherein the frequency of the ultrasonic wave applied to the steel sheet is 100 kHz or less.   The absorbent roll includes a tubular roll shaft having a large number of pores, and a barrel portion formed of an elastic nonwoven sheet material having liquid absorbency provided outside the roll shaft, and the vacuum pump uses the vacuum pump to The method for continuously cleaning steel sheets according to claim 5 or 6, wherein the oil absorbed in the absorbing roll is sucked by making the pressure inside the roll shaft negative.   The continuous cleaning method for a steel sheet according to any one of claims 5 to 7, wherein a cavitation treatment is performed by supplying a medium having ultrasonic waves applied to both surfaces of the traveling steel sheet.

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