JP6643774B2 - Film thickness adjustment unit and steel plate cleaning device - Google Patents

Description

  The present invention relates to a film thickness adjusting unit and a steel plate cleaning apparatus for cleaning a steel plate or the like by removing a predetermined amount of oil adhering to the steel plate or the like.

  Conventionally, after supplying rust-preventive oil to a steel strip, an oil suction roll is used to squeeze the rust-preventive oil adhering to the steel strip and adjust the oil film thickness to adjust the amount of rust-preventive oil applied to the steel strip. It is known (Patent Document 1). In the mechanism for adjusting the oil film thickness described in Patent Document 1, a roll having a structure in which a nonwoven fabric sheet is laminated or wound around a perforated hollow iron core is connected to a suction pipe, and the suction pipe is connected to an oil recovery device. ing. Further, the oil recovery device is configured to be connected to a vacuum pump via a pressure regulating valve. Then, a detection signal from an oil film thickness meter installed on the downstream side of the roll is sent to a pressure adjusting valve, and the suction pressure is controlled to adjust the oil film thickness.

  Further, there is known a film thickness adjusting roll for adjusting the degree of drying by adjusting the surface of a nonwoven fabric laminate of a roll to a wet state or a dry state, and adjusting the amount of residual oil adhering to a steel sheet ( Patent Document 2).

Japanese Patent Publication No. 7-62265 JP 2014-23998 A

  Since the mechanism for adjusting the oil film thickness described in Patent Document 1 relates to a steel strip that is processed to a uniform thickness and is continuously discharged, it is comparatively difficult to install an oil film thickness meter at a reference position. It is considered easy. However, since it is difficult to install an oil film thickness meter for measuring the film thickness of a steel plate cut at a predetermined length at a reference position, the mechanism for adjusting the oil film thickness described in Patent Document 1 is applied to the steel plate. It was difficult.

  Further, in the film thickness adjusting roll described in Patent Document 2, since the inside of the nonwoven fabric laminate needs to be saturated with oil in order to bring the surface of the nonwoven fabric laminate into a wet state, The amount of oil used is large, requiring a long time, and it has not been possible to improve the productivity of steel sheets.

  By the way, the reason for adjusting the film thickness on the steel plate is that, in the pressing process after the steel plate cleaning process, the film thickness needs to be small in the shallow drawing with small unevenness during pressing and thick in the deep drawing with large unevenness. If the film thickness is too thick during shallow drawing, oil marks (the phenomenon of oil marks adhering during pressing) tend to occur, and if the film thickness is too thin during deep drawing, cracks occur in the steel sheet. I do.

  To reduce the film thickness, if the vacuum pressure of the vacuum pump communicating with the suction roll is increased, the surface of the roll will be in a dry state, and the thickness of the steel plate can be extremely easily reduced. On the other hand, in order to increase the film thickness, it is necessary to weaken the negative pressure to make the surface of the roll wet, so that the oil on the steel plate is not excessively absorbed by the roll surface. Furthermore, in order to stably increase the film thickness without unevenness in each of the passed steel sheets, it is necessary to keep the wet state of the roll surface constant.

  Further, in the steel plate cleaning step, the steel plate to which the oil has adhered intermittently passes between the rolls, so that the oil adhered to the steel plate is absorbed by the rolls. Then, the surface of the roll gradually becomes moist, and the thickness of the steel sheet after passing is gradually increased. Therefore, in order to stably maintain the state in which the thickness of the steel sheet is large, it is necessary to maintain the appropriate wet state of the roll surface while removing the oil absorbed from the steel sheet from the roll surface. However, in order to keep the wet state of the roll portion surface constant, it is necessary to finely adjust the negative pressure according to the situation, and it has been difficult to keep the thick film thickness constant.

  The present invention solves the above-mentioned conventional problems, and can easily adjust the wet state of the surface of the roll, adjust the amount of residual oil to a steel plate or the like to secure an optimum film thickness, and improve productivity. It is an object of the present invention to provide a film thickness adjusting unit and a steel sheet cleaning device capable of improving the quality.

In order to solve the conventional problem, the invention according to claim 1 includes a cleaning unit including a roll having a roll unit for removing oil attached to a steel plate or a non-ferrous metal plate, and a cleaning unit that is absorbed by the roll unit. A plurality of pipes interposed between a vacuum suction unit having a vacuum pump for sucking oil through the pipes, and connected to communicate the cleaning unit and the vacuum suction unit; Opening / closing means for adjusting the amount of oil adhering to the steel plate or the non-ferrous metal plate to the roll portion to form an oil film having a predetermined thickness on the surface of the steel plate or the non-ferrous metal plate. Wherein the cross-sectional area of one of the plurality of pipes is larger than the cross-sectional area of the other pipe . Therefore, by adjusting the opening and closing of the opening and closing means of the plurality of pipes, the amount of suction air sucked by the vacuum suction unit and the amount of oil discharged from the roll part can be adjusted, so that the oil absorbed from the steel plate or the non-ferrous metal plate can be adjusted. It is possible to provide a film thickness adjusting unit capable of adjusting the absorption amount, forming an oil film having an optimum thickness on the surface of a steel plate or the like, and improving the productivity. In addition, by cutting a part of the pipe of the existing steel plate cleaning apparatus and incorporating the film thickness adjusting unit according to the present invention, it is possible to achieve the effects of the present invention, and by effectively utilizing existing facilities, Cost can be reduced.

The invention of claim 2 is a cleaning unit including a roll having a roll portion for removing oil attached to a steel plate or a non-ferrous metal plate and a pedestal having a hollow portion, and the oil absorbed by the roll portion, A plurality of vacuum pumps are provided between the vacuum unit and a vacuum suction unit having a vacuum pump that suctions through a pipe by passing through the hollow portion of the pedestal and connected to communicate the cleaning unit and the vacuum suction unit. A pipe and an opening / closing means for opening / closing the pipe are provided, and the opening / closing means adjusts the opening / closing of the plurality of pipes to adjust the amount of oil adhering to the steel plate or the non-ferrous metal plate to the roll portion. By doing so, an oil film of a predetermined thickness is formed on the surface of the steel plate or the non-ferrous metal plate, and a cross-sectional area of one of the plurality of pipes is larger than a cross-sectional area of another pipe. it features a large There. Therefore, by installing a plurality of pipes having different cross-sectional areas, the amount of suction air sucked by the vacuum suction unit and the amount of oil discharged from the roll part can be easily adjusted.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the pipe connecting the cleaning unit and the plurality of pipes has an oil reservoir in which oil is stored so as to shut off negative pressure from the vacuum pump. It is characterized by: Therefore, while the oil is temporarily stored in the oil storage section, the negative pressure increases on the vacuum unit side and returns to the atmospheric pressure on the cleaning unit side. Therefore, a pressure difference occurs between the vacuum unit side and the cleaning unit side. Thereby, the wet state of the roll can be kept constant by intermittently sucking the roll portion.

According to a fourth aspect of the present invention, there is provided a steel sheet cleaning apparatus, comprising a cleaning unit, a vacuum suction unit, and a film thickness adjusting unit according to any one of the first to third aspects. . Therefore, there is provided a steel plate cleaning apparatus capable of adjusting the amount of oil absorbed from a steel plate or a non-ferrous metal plate, forming an oil film having an optimum thickness on the surface of a steel plate or the like, and improving productivity. Can be provided.

According to a fifth aspect of the present invention, in the fourth aspect , the cleaning unit has an oil supply device for supplying oil to the roll portion. Therefore, since oil can be directly supplied to the roll by the oil supply device, it is possible to discard several tens of steel plates that have been passed until the roll becomes wet, as in the related art, as a film thickness defect. And the manufacturing cost can be reduced. Further, since the surface of the roll portion can be made wet in a short time with a small amount of oil, the productivity of the steel sheet can be improved. Here, the passing speed is usually about 100 m to 150 m / min, and the number of steel sheets to be passed per minute is assumed to be approximately 8 to 20 sheets.

According to the first and second aspects of the present invention, it is possible to provide a film thickness adjusting unit capable of forming an oil film having an optimum thickness on a surface of a steel plate or the like and improving productivity. According to the first and second aspects of the present invention, by installing a plurality of pipes having different cross-sectional areas, it is possible to easily adjust the amount of suction air sucked by the vacuum suction unit and the amount of oil discharged from the roll portion. . According to the third aspect of the present invention, the wet state of the roll part can be maintained constant by intermittently sucking the roll part. Further, the invention of claim 4 can provide a steel sheet cleaning apparatus capable of forming an oil film having an optimum thickness on the surface of a steel sheet or the like and improving the productivity. Further, according to the invention of claim 5 , oil can be directly supplied to the roll portion by the oil supply device, and the production cost can be reduced.

Sectional drawing which shows the roll of the cleaning unit which comprises the steel plate cleaning apparatus which concerns on this invention. The conceptual diagram showing the composition of the steel plate cleaning device concerning the present invention. Sectional drawing which expanded the vicinity of the oil reservoir.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited by the embodiment.

FIG. 1 is a cross-sectional view showing a roll of a cleaning unit constituting the steel plate cleaning apparatus according to the present invention. As shown in FIG. 1, the roll 21a includes a pedestal 23, a fastener 25, a plate 26, and a roll portion 22a formed by stacking a plurality of roll pieces 24a and 24b made of nonwoven fabric . The pedestal 23 is made of a metal material such as iron, SUS, or aluminum, and has a roll portion 22a formed on the outer periphery thereof, a main body 27 having an opening 30, and a hollow connected to one end of the main body 27. It is formed of a rotation support portion 28 having a portion 31 and a solid rotation support portion 28 connected to the other end of the main body 27. The roll portion 22a is formed by laminating a plurality of roll pieces 24a and 24b on the outer periphery of a main body portion 27 that forms the pedestal 23 and overlapping each other. It is formed. As the stopper 25, a lock nut with a screw is used. In the present embodiment, one of the rotary support portions 28 has a hollow shape and the other rotary support portion 28 has a solid shape. However, both of the rotary support portions 28 may have a hollow shape. Reference numeral 24d or 24c is a reinforcing plate made of a nonwoven fabric disposed between the roll pieces 24a, 24a or between the roll pieces 24b, 24b.

  A plurality of circular holes 33 are formed in a zigzag pattern on the outer periphery of the main body 27 constituting the pedestal 23. The hole 33 communicates with the opening 30 of the main body 27. The one rotation support portion 28 is provided with a hollow portion 31 and has a connection portion 32 at one end to which a rotary joint (not shown) is connected. The connection part 32 is provided with a screw part 36. The other end of the rotation support portion 28 is connected to an end portion of the main body 27 via a joint 35 formed by welding. The other rotation support portion 28 has a solid shape, and one end is connected to an end portion of the main body 27 via a joint 35 formed by welding. In this embodiment, the rotary joint is connected at the connection portion of one of the rotary support portions 28. However, both rotary support portions 28 are hollow, and both rotary support portions 28 are connected to the rotary joint (not shown). ) May be connected.

  A gradually changing portion 29 having an inclined surface is formed in the vicinity of the joining portion 35 between the main body portion 27 and the one rotation support portion 28. Therefore, in the vicinity of the main body 27 and one of the rotation supporting portions 28, the gradually changing portion 29 in which the opening area of the opening 30 is smaller than the opening area of the substantially central portion of the main body 27 is formed. When the film 21a is connected to a film thickness adjusting unit and a vacuum pump unit to be described later, the oil absorbed by the roll 22a flows into the opening 30 through the fluid introduction groove 34 and the hole 33 by the suction force, and the joint 35 Is discharged to the outside of the roll 21a through the hollow portion 31 without staying in the vicinity of.

  The plate 26 fixed to both ends of the roll portion 22a and the stopper 25 are made of a metal material such as iron, SUS, or aluminum, and are formed in a substantially annular shape, and are formed on the inner periphery of the stopper 25. The threaded portion B38 is fitted and fixed to a threaded portion A37 formed on the outer periphery of the rotation support portion 28.

  In the above-described embodiment, the fluid introduction groove 34 is formed by providing a notch on the inner periphery of the roll piece 24b and the reinforcing plate 24c, but only the roll piece 24a and the reinforcing plate 24d without the notch are provided. It is also possible to use a configuration in which the fluid introduction groove 34 is not provided, and this embodiment is also included in the present invention. When the roll portions 22a are formed by lamination, they can be formed only by the roll pieces 24a and 24b without using the reinforcing plates 24c and 24d, and this form is also included in the present invention.

  FIG. 2 is a conceptual diagram showing the configuration of the steel plate cleaning device according to the present invention, and FIG. 3 is an enlarged cross-sectional view of the vicinity of the oil reservoir. The outline of the configuration of the steel plate cleaning apparatus according to the present invention will be described with reference to FIGS. The steel plate cleaning apparatus 10 according to the present invention includes a cleaning unit 1 including an upper roll 21a having a roll portion 22a for removing oil attached to a steel plate or a non-ferrous metal plate, and a lower roll 21b having a roll portion 22b. A vacuum suction unit 3 provided with a vacuum pump 17 for sucking the oil absorbed by the roll portions 22a and 22b through a pipe, and a cleaning unit 1 and a vacuum suction unit 3 interposed therebetween; A membrane that includes a plurality of pipes (4, 5a, 5b, 5c) connected to communicate with a vacuum suction unit, and an open / close valve (6) that opens and closes the pipe (4), and adjusts an absorption amount of oil attached to a steel plate or a non-ferrous metal plate. And a thickness adjusting unit 2.

  The steel plate cleaning apparatus 10 according to the present invention is configured as described above, and first, the cleaning unit 1 will be described in detail. The cleaning unit 1 includes an upper roll 21a having a roll portion 22a and a lower roll 21b having a roll portion 22b. A brush roll (not shown) is provided upstream of the upper roll 21a and the lower roll 21b. An oil supply device 9 that supplies oil to the upper roll 21a is provided above the upper roll 21a. The oil supply device 9 is used when the thickness of the passed steel plate is to be increased, that is, when the surfaces of the roll portions 22a and 22b are to be kept wet. For example, it is used when switching from a shallow drawn steel plate to a deep drawn steel plate in the steel plate cleaning step, and sprays oil onto the roll portion 22a while rotating the upper roll 21a and the lower roll 21b to make the surface wet. Then, when the surfaces of the roll portions 22a and 22b are sufficiently wet, the oil supply device is stopped and the threading of the steel sheet is started. In this way, the optimum film thickness can be obtained from the first sheet passing, and the roll portion is kept in a wet state without discarding the steel sheet immediately after the start of sheet passing as a defective film thickness as in the related art. be able to.

  One ends of the upper roll 21a and the lower roll 21b are connected to rotary joints 11a and 11b, and the rotary joints 11a and 11b are connected to the header 13 via flexible hoses 12a and 12b.

  Next, the film thickness adjusting unit 2 will be described in detail. The film thickness adjusting unit 2 has an oil reservoir 14, a main pipe 4, thin tubes 5a, 5b, 5c, an opening / closing valve 6, and a vacuum breaking valve 15. Here, the cross-sectional area of the main pipe 4 is formed to be larger than the cross-sectional areas of the thin tubes 5a, 5b, 5c. An open / close valve 18a is installed on the thin tube 5c, and an open / close valve 18b is installed on the thin tube 5b.

  The oil reservoir 14 is connected to the header 13 of the cleaning unit 1. One end of each of the thin tubes 5a, 5b, 5c is connected to the oil reservoir 14, and one end of the main tube 4 is connected to a pipe above the oil reservoir 14, and the main tube 4 and the thin tubes 5a, 5b , 5c is connected to a pipe. The main pipe 4 is provided with an on-off valve 6 for opening and closing the main pipe 4. The oil reservoir 14 can temporarily block suction from a vacuum pump 17 described later when the oil discharged from the rolls 22a and 22b accumulates. In addition, a vacuum break valve 15 is installed in a pipe between the other end of the main pipe 4 and the thin pipes 5a, 5b, 5c and the separator 16 of the vacuum suction unit 3. Here, the vacuum breaking valve 15 is a device that functions as outside air introducing means for reducing the negative pressure from the vacuum pump 17.

  When the main pipe 4 is opened by the open / close valve 6, oil is mainly sucked by the main pipe 4, and the film thickness is reduced. On the other hand, when the main pipe 4 is closed by the opening / closing valve 6, oil is sucked only by the three thin tubes 5a, 5b, and 5c, and the film thickness is increased. Therefore, by switching the main pipe 4 and the three thin pipes 5a, 5b, 5c by the open / close valve 6, the negative pressure and the amount of suction air from the vacuum pump 17 are weakened, and the amount of oil suction from the roll portions 22a, 22b. Therefore, an oil film having an optimum thickness can be formed on the surface of a steel plate or the like. Further, by operating the open / close valve 18a installed on the thin tube 5c and the open / close valve 18b installed on the thin tube 5b, the negative pressure and the amount of suction air are adjusted, and the oil from the roll portions 22a, 22b is adjusted. The suction amount can be adjusted in three stages. In the above embodiment, the pipe in the film thickness adjusting unit 2 is constituted by the main pipe 4 and the thin pipes 5a, 5b, 5c. However, without the main pipe 4, only the thin pipe provided with a large number of thin pipes is provided. A configuration may be adopted, and this embodiment is also included in the present invention. In the above embodiment, the on-off valves 18a and 18b are installed on the thin tubes 5c and 5b. However, the on-off valves are also installed on the thin tubes 5a, that is, the on-off valves are installed on all the thin tubes. It is also possible to adopt a configuration that is included in the present invention. Further, in the above embodiment, a valve is used as the opening / closing means, but any means other than the valve as long as it can open and close the piping is also included in the present invention.

  In addition, by adjusting both or one or both of the number and length of the thin tubes 5a, 5b, 5c to be installed, the negative pressure and the amount of suction air can be adjusted, and the amount of oil suction per unit time can be set. An oil film having an optimum thickness can be formed on the surface of a steel plate or the like.

  Here, the function of the oil reservoir 14 when only the thin tubes 5a, 5b, 5c are used will be described. Since the cross-sectional areas of the small tubes 5a, 5b, and 5c are smaller than the cross-sectional area of the main tube 4, when the open / close valve 6 of the main tube 4 is closed, a large amount of oil is discharged from the roll portion in a short time. Then, the oil 19 temporarily accumulates in the oil sump 14. In this state, the ends of the thin tubes 5a, 5b, and 5c on the sides connected to the oil reservoirs are covered with the oil 19. That is, since the oil 19 is accumulated so as to block the negative pressure from the vacuum pump 17, the negative pressure on the vacuum suction unit 3 side increases with the accumulated oil 19 as a boundary, and the cleaning unit 1 side returns to the atmospheric pressure. . When the oil 19 in the oil reservoir 14 is discharged to the vacuum suction unit 3 through the small tubes 5a, 5b, and 5c, the suction force of the vacuum pump 17 reaches the rolls 22a and 22b, and the roll 22a , 22b is restarted. As described above, the oil is intermittently discharged from the rolls 22a and 22b by repeating the discharge of the oil from the rolls 22a and 22b and the interruption of the negative pressure by the oil reservoir 14.

  If the negative pressure of the vacuum pump 17 is not interrupted, that is, if the negative pressure is always applied to the rolls 21a and 21b, even though the steel plate is intermittently passed, the roll starts to be passed. The amount of oil discharged from the portions 22a and 22b is large, and the amount of oil discharged from the roll portions 22a and 22b gradually decreases over time. That is, the supply amount of oil through the passing of the steel plate does not match the amount of oil discharged by suction, so that the wet state of the surfaces of the roll portions 22a and 22b cannot be kept constant. Therefore, by interrupting the negative pressure of the vacuum pump 17 intermittently by the oil reservoir 14, it is possible to prevent the thickness of the steel plate from gradually increasing while continuing to pass.

  Next, the vacuum suction unit 3 will be described in detail. The vacuum suction unit 3 has a separator 16 and a vacuum pump 17, and the separator 16 is connected to the main pipe 4 and the thin tubes 5a, 5b, and 5c of the film thickness adjusting unit 2 via piping. The separator is configured to be separated into oil and gas and discharged to the outside.

  As described above, the steel plate cleaning apparatus 10 according to the present invention increases the cross-sectional area of the main pipe 4 of the film thickness adjusting unit 2 larger than the cross-sectional areas of the thin tubes 5a, 5b, and 5c, and opens and closes the main pipe 4. By installing the valve 6 on the main pipe 4, the amount of suction air sucked by the vacuum suction unit 3 and the amount of oil discharged from the roll part can be easily adjusted.

  In addition, by installing a vacuum break valve 15 in the pipe between the main pipe 4 and the other end of the thin pipes 5a, 5b, 5c and the separator 16, a high vacuum state of the pipe is reduced when the thin pipes 5a, 5b, 5c are used. Thus, the load on the vacuum pump 17 can be reduced. The vacuum break valve 15 has a structure in which outside air is introduced when a predetermined negative pressure reaches a preset negative pressure. By changing the set value of the predetermined negative pressure, the vacuum release valve 15 accumulates in the oil reservoir 14. It is possible to adjust the time for discharging the oil. That is, the upper limit of the pressure difference between the roll side and the pump side acting on the thin tubes 5a, 5b, 5c is made constant by the vacuum breaking valve 15, so that the flow velocity in the thin tubes 5a, 5b, 5c can be made constant. Therefore, the time required for discharging the oil 19 accumulated in the oil reservoir 14 can be lengthened or shortened by the set value of the vacuum break valve 15.

  Specifically, when the initial set value of the vacuum break valve 15 is −60 kPa, changing the set value to −40 kPa increases the time required for discharging the oil from the oil reservoir 14 from the time when the set value is −60 kPa. Therefore, the time during which the negative pressure of the vacuum pump 17 is cut off becomes longer, and the wet state of the roll portions 22a and 22b increases, thereby increasing the film thickness. Conversely, if the set value is changed from −60 kPa to −80 kPa, the time required for oil to be discharged from the oil reservoir 14 becomes shorter than when the set value is −60 kPa, so that the negative pressure of the vacuum pump 17 is cut off. In this case, the wet time of the roll portions 22a and 22b is reduced, and the film thickness is reduced.

  Therefore, by combining the above-described adjustment by opening and closing the thin tubes 5a, 5b, and 5c, finer fine adjustment can be performed. Only by adjusting the opening and closing of the main pipe 4 and the thin pipes 5a, 5b and 5c, it is only possible to adjust the film thickness stepwise as to which pipe is to be opened, but by combining the fine adjustment with the set value of the vacuum break valve 15, for example, It is possible to make fine adjustments such as setting a film thickness when one thin tube is opened and an intermediate film thickness between two thin tubes when opened. Therefore, an oil film having a desired thickness can be formed on a steel plate or a non-ferrous metal plate.

  In the above embodiment, one vacuum break valve 15 is provided in the pipe and the set value thereof is changed. However, a plurality of vacuum break valves 15 are provided in the pipe, and different set values are used to determine which vacuum break is performed by the electric valve. It is also possible to control whether the valve 15 is opened and closed, and this embodiment is also included in the present invention. Specifically, three vacuum break valves 15 are provided in the pipe, and the set values are -40 kPa, -60 kPa, and -80 kPa. Then, among the electric valves connected to each vacuum break valve, which electric valve is opened or closed can be managed by a switch. By doing so, the user can easily change the set value with the switch and adjust the film thickness without changing the set value of the vacuum break valve 15.

  The film thickness adjusting unit and the steel plate cleaning device according to the present invention are used for cleaning a steel plate or the like by removing a predetermined amount of oil adhering to the steel plate or the like.

DESCRIPTION OF SYMBOLS 1 Cleaning unit 2 Film thickness adjustment unit 3 Vacuum suction unit 4 Main pipe (piping)
5a, 5b, 5c Narrow tube (piping)
6 Open / close valve 9 Oil supply device 10 Steel plate cleaning device 11a, 11b Rotary joint 12a, 12b Flexible hose 13 Header 14 Oil reservoir 15 Vacuum break valve 16 Separator 17 Vacuum pump 18a, 18b Open / close valve 21a Upper roll 21b Lower roll 22a, 22b Roll section

Claims (5)

  A cleaning unit including a roll having a roll unit for removing oil adhering to a steel plate or a non-ferrous metal plate, and a vacuum suction unit including a vacuum pump that suctions oil absorbed by the roll unit via a pipe. And a plurality of pipes connected to communicate the cleaning unit and the vacuum suction unit, and an opening / closing means for opening and closing the pipes, and are attached to the steel plate or the non-ferrous metal plate. An oil film having a predetermined film thickness is formed on the surface of the steel plate or the non-ferrous metal plate by adjusting an amount of oil absorbed into the roll portion, and one of the plurality of pipes is cut off. A film thickness adjustment unit characterized in that the area is larger than the cross-sectional area of other piping. A cleaning unit including a roll having a roll portion for removing oil adhering to a steel plate or a non-ferrous metal plate and a pedestal having a hollow portion, and the oil absorbed in the roll portion, the hollow portion of the pedestal. A plurality of pipes interposed between a vacuum suction unit provided with a vacuum pump for sucking through the pipes through the pipes and connected to communicate the cleaning unit and the vacuum suction unit; Opening and closing means to adjust the opening and closing of the plurality of pipes to adjust the amount of oil adhering to the steel plate or the non-ferrous metal plate to the roll portion, the steel plate or A film in which an oil film having a predetermined thickness is formed on a surface of the non-ferrous metal plate , wherein a cross-sectional area of one of the plurality of pipes is larger than a cross-sectional area of another pipe. Thickness adjustment unit Connecting the cleaning unit and a plurality of pipes piping thickness adjustment according to claim 1 or 2, characterized in that it has an oil reservoir oil accumulates to block the negative pressure from the vacuum pump unit. A cleaning unit, and a vacuum suction unit, a steel sheet cleaning apparatus characterized by having a film thickness adjustment unit according to any one of claims 1-3. The steel plate cleaning device according to claim 4 , wherein the cleaning unit has an oil supply device that supplies oil to the roll unit.

Images