WO2016067821A1

WO2016067821A1 - Cleaning fluid spray device and cleaning fluid spray method

Info

Publication number: WO2016067821A1
Application number: PCT/JP2015/077811
Authority: WO
Inventors: 直樹松坂; 慶太谷本; 藤原　誠; 熊野　晴彦
Original assignee: Ｊｆｅスチール株式会社
Priority date: 2014-10-28
Filing date: 2015-09-30
Publication date: 2016-05-06
Also published as: JP6065990B2; CN107073528B; TW201622828A; TWI568498B; CN107073528A; JPWO2016067821A1

Abstract

A cleaning fluid spray device according to an embodiment of the present invention is provided with: a circulation tube for circulating cleaning fluid to a spray nozzle; a rotating brush for cleaning internal parts of this circulation tube; and a magnetizing unit for magnetizing a rotating shaft for this rotating brush. The rotating brush has: the rotating shaft, which rotates centered in the axial direction of the circulation tube; and brushes provided along the longitudinal direction of this rotating shaft. In the cleaning fluid spray device, magnetic contaminants in the cleaning fluid present within the circulating tube are attracted to the rotating shaft magnetized by the magnetizing unit, the magnetic contaminants eliminated from this cleaning fluid, and the cleaning fluid after elimination of the magnetic contaminants sprayed onto a metal plate surface of an object to be cleaned from the spray nozzle.

Description

Cleaning liquid injection device and cleaning liquid injection method

The present invention relates to a cleaning liquid injection apparatus and a cleaning liquid injection method for injecting a cleaning liquid onto the surface of a metal plate to be cleaned.

Conventionally, in a production line for a steel sheet such as a thin plate, a cleaning process for cleaning the surface of the rolled steel sheet is performed before a predetermined process such as an annealing process. Generally, rolling oil and iron powder adhere to the surface of the steel sheet after rolling. In the cleaning process, for example, the spraying liquid is sprayed onto the surface of the steel sheet by a spray device, and the surface of the steel sheet is brushed by the rotation of a brush roll, thereby removing the adhering rolling oil and iron powder from the surface of the steel sheet to be cleaned. The

In the cleaning process, as described above, the surface of the steel sheet after the spraying and brushing of the cleaning liquid is rinsed by spraying water at a predetermined pressure to spray the surface of the steel sheet. As a result, remaining iron powder and the like are washed away from the surface of the steel plate to be cleaned.

On the other hand, the spray device used in the above-described cleaning step usually includes an injection nozzle (spray nozzle) that injects the cleaning liquid onto the surface of the steel plate to be cleaned, and a spray pipe (spray header) that distributes the cleaning liquid to the injection nozzle. ing. In such a spray device, as a result of spraying the cleaning liquid over a long period of time, the inside of the spray pipe is contaminated, resulting in clogging (blocking) of the spray nozzle. In order to prevent this, it is necessary to periodically clean the inside of the spray pipe.

As a method of cleaning the inside of the spray pipe, the operation of a production line such as an annealing line having cleaning equipment such as a spray device has been conventionally stopped, and the spray pipe is removed while the operation is stopped. A method of performing cleaning outside the production line, that is, offline. On the other hand, a brush body is attached to the rotary shaft provided inside the spray pipe, and a handle is attached to one end of the rotary shaft that protrudes outside the spray pipe. By rotating the handle, the brush body is attached together with the rotary shaft. There is a conventional technique of rotating and cleaning the inside of a spray pipe in a production line, that is, online (see, for example, Patent Document 1).

Japanese Utility Model Publication No. 62-95770

In the cleaning process described above, the water used for rinsing the steel sheet surface, that is, the waste liquid at the time of rinsing the steel sheet surface (hereinafter referred to as “rinse waste liquid”) is collected, and the recovered rinse waste liquid is used to wash the steel sheet surface. Reusing as a cleaning liquid is effective for saving resources such as water and cost.

However, since the rinsing waste liquid contains iron powder washed away from the steel sheet surface, when the rinsing waste liquid is reused as the cleaning liquid for the steel sheet surface, the iron powder in the rinsing waste liquid (iron from the rinsed steel sheet surface) Powder) flows into the spray pipe as contaminants in the cleaning liquid. Iron powder contained as contaminants in the cleaning liquid in the spray pipe flows out together with the cleaning liquid sprayed from the spray nozzle onto the surface of the steel plate to be cleaned, and excessively adheres to the surface of the steel plate to be cleaned. As a result, there arises a problem that the cleaning process for removing iron powder and the like from the surface of the steel plate to be cleaned becomes insufficient. In the above-described conventional technology, it is difficult to suppress the situation where foreign substances such as iron powder flow out together with the cleaning liquid sprayed from the spray nozzle onto the surface of the steel plate to be cleaned.

Furthermore, foreign matter such as iron powder remaining on the surface of the steel sheet because the cleaning process on the surface of the steel sheet is insufficient causes deterioration of the appearance of the surface of the steel sheet in the next step. For example, when an annealing process is performed as the next process of this cleaning process, foreign substances such as iron powder remaining on the surface of the steel sheet are brought into the annealing furnace, and the foreign substances adhere to the hearth roll in the annealing furnace. To do. As a result, the appearance of the steel plate surface is deteriorated because the pressing surface is generated on the steel plate surface in the annealing furnace.

The present invention has been made in view of the above circumstances, and when cleaning the surface of a metal plate such as a steel plate, the injection nozzle that sprays the cleaning liquid is prevented from being clogged, and impurities such as iron powder are removed. It aims at providing the washing | cleaning-liquid injection apparatus and the washing | cleaning-liquid injection method which can suppress the situation which sprays on the surface of the metal plate to be cleaned with the cleaning liquid.

In order to solve the above-described problems and achieve the object, a cleaning liquid ejecting apparatus according to the present invention includes a flow pipe that circulates the cleaning liquid to the spray nozzle, a rotating shaft that rotates about the axial direction of the flow pipe, A rotating brush that is provided along a longitudinal direction of the rotating shaft and includes a rotating brush that cleans the inside of the flow tube, and a magnetizing unit that magnetizes the rotating shaft, and the rotating shaft magnetized by the magnetizing unit The magnetic contaminants in the cleaning liquid existing in the flow pipe are adsorbed to remove the magnetic contaminants from the cleaning liquid, and the cleaning liquid after the magnetic contaminants are removed is discharged from the jet nozzle to the metal to be cleaned. It is characterized by spraying on the plate surface.

In the cleaning liquid ejecting apparatus according to the present invention, in the above invention, the rotating shaft is formed using a soft magnetic material, and the magnetizing unit magnetizes the rotating shaft during a period of cleaning the surface of the metal plate. The magnetic contaminants are removed from the cleaning liquid, and the rotating shaft is switched from a magnetized state to a non-magnetized state to remove the magnetic contaminants from the rotating shaft during a period in which the inside of the flow pipe is cleaned. The tube has a discharge port, and discharges the magnetic impurities released together with the cleaning liquid used for cleaning the inside of the flow tube by the rotating brush through the discharge port.

Further, the cleaning liquid injection method according to the present invention magnetizes the rotating shaft of the rotating brush that rotates around the axial direction of the flow pipe that circulates the cleaning liquid to the injection nozzle and cleans the inside of the flow pipe. A magnetizing step for removing magnetic contaminants from the cleaning liquid by adsorbing magnetic contaminants in the cleaning liquid existing inside the flow pipe to the rotating shaft, and the cleaning nozzle after removing the magnetic contaminants to the jet nozzle And a spraying step of spraying onto the surface of the metal plate to be cleaned.

Further, the cleaning liquid injection method according to the present invention is the above invention, wherein in the above invention, a magnetization elimination step for canceling the magnetization state of the rotation shaft and making the rotation shaft in a non-magnetization state, and the inside of the flow pipe by the rotation brush. An in-pipe cleaning step for cleaning, wherein the magnetizing step magnetizes the rotating shaft formed using a soft magnetic material for a period of cleaning the surface of the metal plate to remove the magnetic contaminants from the cleaning liquid. And removing the magnetic contaminants from the rotating shaft by switching the rotating shaft magnetized by the magnetizing step from a magnetized state to a non-magnetized state during a period of cleaning the inside of the flow pipe. In the pipe cleaning step, the magnetic contaminants released by the magnetization elimination step are used for cleaning the inside of the flow pipe by the rotating brush. Characterized in that it discharged to the outside through the outlet of the flow pipe together with the cleaning liquid.

According to the present invention, when cleaning the surface of the metal plate, the injection nozzle that injects the cleaning liquid is prevented from being clogged, and a situation in which impurities such as iron powder are injected onto the surface of the metal plate to be cleaned together with the cleaning liquid is suppressed. There is an effect that can be.

FIG. 1 is a diagram illustrating a configuration example of a cleaning liquid ejecting apparatus according to an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along line AA showing a schematic structure in the spray pipe of the cleaning liquid ejecting apparatus shown in FIG. FIG. 3 is a diagram illustrating a state in which the cleaning liquid is sprayed onto the surface of the steel plate to be cleaned. FIG. 4 is a diagram illustrating a state in which the magnetic contaminants in the cleaning liquid are adsorbed to the rotating shaft of the rotating brush when the steel plate surface is cleaned. FIG. 5 is a diagram illustrating a state in which the inside of the spray pipe is cleaned online. FIG. 6 is a diagram illustrating a state in which magnetic contaminants are released from the rotating shaft of the rotating brush when the spray pipe is cleaned. FIG. 7 is a diagram showing a state in which the inside of the spray pipe is brushed by the rotating brush. FIG. 8 is a diagram illustrating a configuration example of the cleaning liquid ejecting apparatus according to the second embodiment of the present invention. FIG. 9 is a diagram illustrating a configuration example of the rotating shaft of the rotating brush according to the second embodiment of the present invention. FIG. 10 is a diagram showing a structural example of a cross section taken along line BB of the rotating shaft shown in FIG. FIG. 11 is a diagram for explaining switching between the magnetization state and the non-magnetization state of the rotation axis of the rotary brush according to the second embodiment of the present invention.

Hereinafter, with reference to the attached drawings, preferred embodiments of a cleaning liquid ejecting apparatus and a cleaning liquid ejecting method according to the present invention will be described in detail. Note that the present invention is not limited to the embodiment. Moreover, the drawings are schematic, and it should be noted that the relationship between the dimensions of each element, the ratio of each element, and the like may differ from the actual ones. Even between the drawings, there are cases in which portions having different dimensional relationships and ratios are included. Moreover, in each drawing, the same code | symbol is attached | subjected to the same component.

(Embodiment 1)
First, the configuration of the cleaning liquid ejecting apparatus according to the first embodiment of the present invention will be described. FIG. 1 is a diagram illustrating a configuration example of a cleaning liquid ejecting apparatus according to an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along line AA showing a schematic structure in the spray pipe of the cleaning liquid ejecting apparatus shown in FIG. As shown in FIGS. 1 and 2, the cleaning liquid ejecting apparatus 1 according to the embodiment of the present invention is used for spray piping 2 provided with spray nozzles 3 a to 3 f for spraying cleaning liquid 17, and for cleaning the inside of the spray piping 2. The rotating brush 4 and a magnetizing unit 9 that appropriately magnetizes the rotating shaft 5 of the rotating brush 4 are provided. Further, the cleaning liquid ejecting apparatus 1 has a housing 10 that forms a cleaning space for performing a cleaning process, a waste liquid recovery unit 11 that recovers a rinse waste liquid 15 generated in the cleaning process of the steel plate 14 to be cleaned, and a spray pipe 2. A cleaning liquid supply unit 12 that supplies the cleaning liquid 17 and pipes 13a to 13c are provided.

The spray pipe 2 functions as a flow pipe for flowing the cleaning liquid 17 for cleaning the surface of the steel plate 14 which is an example of the metal plate to be cleaned to the spray nozzles 3a to 3f. Specifically, as shown in FIGS. 1 and 2, the spray pipe 2 is a cylindrical pipe whose longitudinal direction is the pipe axis direction, and a plurality (six in the first embodiment) of spray nozzles 3a to 3 are used. 3f is provided. A pipe 13c leading to the cleaning liquid supply unit 12 is connected to the inlet side of the spray pipe 2, and a discharge port 2c and a discharge valve 2d are provided on the outlet side of the spray pipe 2. The discharge port 2 c is for discharging the waste liquid after cleaning in the spray pipe 2. The discharge valve 2d is a manual or automatic opening / closing valve, and allows the drainage of the waste liquid from the discharge port 2c when opened, and blocks the drainage of the waste liquid from the discharge port 2c when closed. The spray pipe 2 receives the cleaning liquid 17 supplied from the cleaning liquid supply unit 12 through the pipe 13c into the pipe, and receives the received cleaning liquid 17 in the flow direction from the inlet side (the pipe 13c side) toward the outlet side (the outlet 2c side). While being distributed, it is distributed to each of the spray nozzles 3a to 3f.

Further, the spray pipe 2 includes

shaft support portions

2a and 2b that rotatably support the rotating shaft 5 of the rotating brush 4. The spray pipe 2 is installed inside the housing 10 so that the rotary shaft 5 is rotatably supported by the

shaft support portions

2a and 2b, and the surface of the steel plate 14 to be cleaned and the spray nozzles 3a to 3f are opposed to each other. The At this time, in the spray pipe 2, the inlet end and the vicinity thereof (for example, a part to which the pipe 13 c is connected), the discharge port 2 c and the discharge valve 2 d are, as shown in FIG. Outside of the cleaning process line. In addition, as shown in FIG. 1, it is desirable for the spray pipe 2 to be installed so that the pipe axis direction and the width direction of the steel plate 14 are the same direction.

Each of the spray nozzles 3a to 3f is a nozzle that can open and close the injection port, and is provided on the side wall portion of the spray pipe 2 along the tube axis direction of the spray pipe 2 as shown in FIG. Although not shown in particular, the inside of each of the spray nozzles 3a to 3f communicates with the inside of the spray pipe 2. The spray nozzles 3a to 3f respectively inject the cleaning liquid 17 flowing through the spray pipe 2 toward the surface of the steel plate 14.

The rotating brush 4 cleans the inside of the spray pipe 2. In the first embodiment, the rotating brush 4 has a rotating shaft 5, brushes 6a to 6g, 7a to 7f, and a handle 8, as shown in FIG.

The rotary shaft 5 is a shaft body that forms the central axis in the rotation of the rotary brush 4. Specifically, the rotating shaft 5 is made of a metal material that can switch between a magnetized state that is magnetized and a non-magnetized state that is not magnetized, such as a soft magnetic material such as iron or steel. It is formed in a rod shape that is longer than the length of the spray pipe 2 in the longitudinal direction. As shown in FIG. 1, the rotary shaft 5 is inserted and arranged inside the spray pipe 2 so that the longitudinal direction of the rotary shaft 5 and the pipe axis direction of the spray pipe 2 are the same direction. At this time, as shown in FIG. 1, the rotary shaft 5 is arranged so that a predetermined length portion on the handle 8 side extends to the outside of the spray pipe 2. Further, a portion of the rotary shaft 5 at a predetermined distance from the end portion (base end portion) on the handle 8 side is rotatably supported by a shaft support portion 2a on the inlet side of the spray pipe 2, and the tip portion is sprayed. It is rotatably supported by a shaft support portion 2b on the outlet side of the pipe 2. Such a rotating shaft 5 rotates around the tube axis direction of the spray pipe 2 by a rotating operation using the handle 8.

The brushes 6a to 6g and 7a to 7f perform brushing for rubbing the inside of the spray pipe 2 to remove dirt (adhering impurities, etc.) inside the spray pipe 2. Specifically, as shown in FIG. 1, the brushes 6a to 6g and 7a to 7f are provided on the rotating shaft 5 so as to extend in a direction (for example, radial direction) perpendicular to the longitudinal direction of the rotating shaft 5, respectively. It is provided in the outer wall part of the rotating shaft 5 along a longitudinal direction.

The brushes 6a to 6g brush the inner wall region that does not include the inner portions of the spray nozzles 3a to 3f in the spray pipe 2. As shown in FIG. 1, the brushes 6 a to 6 g are provided on the outer wall portion of the rotating shaft 5 at predetermined intervals along the longitudinal direction of the rotating shaft 5. These brushes 6a to 6g extend from the rotary shaft 5 toward the inner wall surface 2e of the spray pipe 2 and come into contact with the inner wall surface 2e, as exemplified by the brush 6c shown in FIG. On the other hand, it arrange | positions inside the spray piping 2 so that the frictional force suitable for brushing may be generated.

On the other hand, the brushes 7a to 7f brush the inner wall region including the inner part of the spray nozzles 3a to 3f in the spray pipe 2. As shown in FIG. 1, the brushes 7 a to 7 f are provided on the outer wall portion of the rotating shaft 5 at predetermined intervals along the longitudinal direction of the rotating shaft 5. These brushes 7a to 7f are extended from the rotary shaft 5 toward the inner wall surface 2e of the spray pipe 2 and illustrated inside the inner wall surface 2e or the spray nozzles 3a to 3f (as exemplified by the brush 7c shown in FIG. 2). 2 is arranged inside the spray pipe 2 so as to generate frictional force suitable for brushing on the inner wall surface 2e and each inner side of the spray nozzles 3a to 3f. The In the first embodiment, in the spray pipe 2, the brushing areas by the brushes 7 a to 7 f and the brushing areas by the brushes 6 a to 6 g are continuous along the tube axis direction of the spray pipe 2.

The handle 8 is for operating the inside of the spray pipe 2 by the rotation of the rotating brush 4. Specifically, as shown in FIG. 1, the handle 8 is fixedly disposed at the base end portion of the rotating shaft of the rotating brush 4. The handle 8 rotates the rotating shaft 5 around the tube axis direction of the spray pipe 2 in response to a rotating operation (for example, manual operation) by the operator, and the brushes 6a to 6g and 7a to 7f are moved to the rotating shaft. 5 is rotated in the outer peripheral direction (rotation direction). As a result, the handle 8 causes the brushes 6a to 6g and 7a to 7f to brush the inside of the spray pipe 2.

The magnetizing unit 9 magnetizes the rotating shaft 5 of the rotating brush 4 so that it can be switched between a magnetized state and a non-magnetized state. Specifically, in the first embodiment, the magnetizing portion 9 is configured using a hard magnetic material such as a permanent magnet, and extends outside the spray pipe 2 of the rotating shaft 5 as shown in FIG. Provided in the protruding part. The magnetizing unit 9 brings the hard magnetic material into contact with the rotating shaft 5 or separates the hard magnetic material from the rotating shaft 5 by operating a changeover switch (not shown) or the like. The magnetizing unit 9 magnetizes the rotating shaft 5 by bringing a hard magnetic material into contact with the rotating shaft 5 to bring it into a magnetized state. Alternatively, the magnetizing unit 9 separates the hard magnetic body in contact with the rotating shaft 5 from the rotating shaft 5, thereby canceling the magnetization state of the rotating shaft 5 and making the rotating shaft 5 non-magnetized.

Here, in the cleaning process in the production line of the steel plate 14, the cleaning liquid 17 in the spray pipe 2 is sprayed on the surface of the steel plate 14 during the period for cleaning the surface of the steel plate 14 to be cleaned (hereinafter referred to as the steel plate cleaning period). Injected from each of the nozzles 3a to 3f. In the first embodiment, the cleaning liquid 17 contains magnetic impurities when it flows into the spray pipe 2 from the cleaning liquid supply unit 12. The magnetic impurities are magnetic impurities such as iron powder.

The magnetizing unit 9 magnetizes the rotating shaft 5 as described above during the steel plate cleaning period of the cleaning process. The cleaning liquid ejecting apparatus 1 causes the rotating shaft 5 magnetized by the magnetizing unit 9 to adsorb the magnetic contaminants in the cleaning liquid 17 existing inside the spray pipe 2, thereby separating the cleaning liquid 17 from the magnetic contaminants. Magnetic impurities are removed from the cleaning liquid 17 in the spray pipe 2. The spray pipe 2 circulates the cleaning liquid 17 after removing magnetic contaminants to each of the spray nozzles 3a to 3f while flowing in the flow direction from the inlet side to the outlet side. The cleaning liquid injection device 1 sprays the cleaning liquid 17 after removing magnetic impurities in the spray pipe 2 from the spray nozzles 3a to 3f onto the surface of the steel plate 14 to be cleaned.

On the other hand, as a cleaning liquid for cleaning the inside of the spray pipe 2 during a period for cleaning the inside of the spray pipe 2 (hereinafter referred to as an in-pipe cleaning period) in the production line (that is, online) of the steel plate 14, the spray is supplied from the cleaning liquid supply unit 12. A cleaning liquid 17 is supplied into the pipe 2. The inside of the spray pipe 2 is brushed by the rotation of the rotating brush 4 while using the supplied cleaning liquid 17 and thereby cleaned.

During the in-pipe cleaning period of the spray pipe 2, the magnetizing unit 9 switches the rotating shaft 5 from the magnetized state to the non-magnetized state as described above. Accordingly, the cleaning liquid ejecting apparatus 1 releases the magnetic contaminants adsorbed on the rotating shaft 5 by the magnetic force from the rotating shaft 5 into the cleaning liquid 17. At this time, in the cleaning liquid 17 inside the cleaned spray pipe 2, the magnetic contaminants released from the non-magnetized rotating shaft 5 and the brushing from the inner wall surface 2e of the spray pipe 2 or the inside of the spray nozzles 3a to 3f are performed. Contaminants (including those having magnetism and those not having magnetism) removed by the above are mixed. The spray pipe 2 has the discharge port 2c as described above, and together with the cleaning liquid 17 used for cleaning the inside of the spray pipe 2 by the rotating brush 4, the free magnetic contaminants and the removed contaminants are discharged into the discharge port 2c. Through the outside.

As shown in FIG. 1, the housing 10 surrounds most of the spray pipe 2 and forms a cleaning space for performing a cleaning process. The housing 10 receives the sequentially transported steel plates 14 in an internal cleaning space, and the surface of the steel plate 14 is cleaned in the cleaning space, thereby suppressing unintentional foreign matter adhesion to the surface of the steel plate 14. To do. In addition, the conveyance direction of the steel plate 14 is a direction perpendicular to the width direction and the thickness direction of the steel plate 14 (direction perpendicular to the paper surface of FIG. 1).

The waste liquid recovery unit 11 recovers the rinse waste liquid 15 from the steel sheet 14 in the cleaning process, and reuses the recovered rinse waste liquid 15 for cleaning the steel sheet 14 from the next time. Here, in the cleaning step, the surface of the steel sheet 14 is brushed by the rotation of a brushing roll (not shown) while the cleaning liquid spraying apparatus 1 sprays the cleaning liquid 17 onto the surface of the steel sheet 14. Thereafter, a rinsing liquid such as water having a predetermined pressure is sprayed onto the surface of the steel plate 14, thereby rinsing the surface of the steel plate 14. The waste liquid recovery unit 11 recovers the rinse waste liquid 15 from the steel plate 14 during the rinsing process. The waste liquid recovery unit 11 appropriately stores the collected rinse waste liquid 15 and then sends the rinse waste liquid 15 to the cleaning liquid supply unit 12 through the pipe 13a.

The cleaning liquid supply unit 12 supplies a cleaning liquid 17 used for cleaning the surface of the steel plate 14 or cleaning the inside of the spray pipe 2 to the spray pipe 2. Specifically, the cleaning liquid supply unit 12 is configured using a pump or the like. The cleaning liquid supply unit 12 appropriately receives the rinse waste liquid 15 from the waste liquid recovery unit 11 through the pipe 13a. The rinsing waste liquid 15 is a waste liquid collected from the steel sheet 14 during the rinsing process as described above, and contains magnetic impurities such as iron powder that is washed away from the surface of the steel sheet 14 by the rinsing process. On the other hand, the cleaning liquid supply unit 12 appropriately receives a new cleaning liquid 16 from a predetermined supply source (not shown) through the pipe 13b. The new cleaning liquid 16 is not a reused one but a new cleaning liquid, and hardly contains impurities regardless of whether it is magnetic or non-magnetic. The cleaning liquid supply unit 12 uses the rinse waste liquid 15, the new cleaning liquid 16, or a mixture thereof as the cleaning liquid 17, and supplies the cleaning liquid 17 to the inside of the spray pipe 2 through the pipe 13 c.

The pipe 13 a is a pipe that connects the waste liquid recovery unit 11 and the cleaning liquid supply unit 12, and causes the rinse waste liquid 15 to flow from the waste liquid recovery unit 11 toward the cleaning liquid supply unit 12. On the other hand, the pipe 13 b is a pipe that communicates a supply source (not shown) of a new cleaning liquid 16 such as a tank and the cleaning liquid supply unit 12, and allows the new cleaning liquid 16 to flow toward the cleaning liquid supply unit 12. On the other hand, the pipe 13 c is a pipe that connects the cleaning liquid supply unit 12 and the spray pipe 2, and distributes the cleaning liquid 17 from the cleaning liquid supply unit 12 into the spray pipe 2.

Next, the cleaning liquid injection method according to the first embodiment of the present invention will be described. FIG. 3 is a diagram illustrating a state in which the cleaning liquid is sprayed onto the surface of the steel plate to be cleaned. FIG. 4 is a diagram illustrating a state in which the magnetic contaminants in the cleaning liquid are adsorbed to the rotating shaft of the rotating brush when the steel plate surface is cleaned. FIG. 5 is a diagram illustrating a state in which the inside of the spray pipe is cleaned online. FIG. 6 is a diagram illustrating a state in which magnetic contaminants are released from the rotating shaft of the rotating brush when the spray pipe is cleaned. FIG. 7 is a diagram showing a state in which the inside of the spray pipe is brushed by the rotating brush. Hereinafter, the cleaning liquid injection method according to the first embodiment of the present invention will be described in detail with reference to FIGS.

The cleaning liquid injection method according to the first exemplary embodiment of the present invention uses the cleaning liquid injection device 1 in the cleaning process of the steel plate 14 to remove magnetic contaminants contained in the cleaning liquid 17, and the cleaning liquid 17 after removing the magnetic contaminants is used. Are sprayed onto the surface of the steel plate 14 that is sequentially conveyed.

Specifically, in the cleaning liquid injection method according to the first exemplary embodiment of the present invention, the cleaning liquid injection apparatus 1 reuses the rinse waste liquid 15 as the cleaning liquid 17 as shown in FIG. 2 are sequentially supplied (cleaning liquid supply step). At this time, the waste liquid collection unit 11 sequentially sends the rinse waste liquid 15 that has already been collected to the cleaning liquid supply unit 12 through the pipe 13a. The cleaning liquid supply unit 12 mixes the rinsing waste liquid 15 sent from the waste liquid recovery unit 11 with the new cleaning liquid 16 introduced through the pipe 13 b, thereby generating the cleaning liquid 17 that reuses the rinsing waste liquid 15. That is, in the first embodiment, the cleaning liquid 17 contains at least the rinse waste liquid 15. The cleaning liquid supply unit 12 sequentially supplies such cleaning liquid 17 into the spray pipe 2 through the pipe 13c.

Next, the cleaning liquid ejecting apparatus 1 magnetizes the rotating shaft 5 of the rotating brush 4, and adsorbs magnetic impurities in the cleaning liquid 17 existing in the spray pipe 2 to the rotating shaft 5 in the magnetized state so that the inside of the spray pipe 2. Magnetic contaminants are removed from the cleaning liquid 17 (magnetization step). In the cleaning liquid ejecting apparatus 1, the spray pipe 2 is a flow pipe that distributes the cleaning liquid 17 to the spray nozzles 3a to 3f. The rotating shaft 5 is a shaft body at the center of rotation of the rotating brush 4 that rotates around the tube axis direction of the spray pipe 2 to clean the inside of the spray pipe 2, and uses a soft magnetic material as described above. It is formed. The rotating brush 4 is stationary without rotating during the steel plate cleaning period.

In this magnetization step, the magnetizing unit 9 contacts a hard magnetic material such as a permanent magnet with the rotating shaft 5 during a steel plate cleaning period by operating a predetermined changeover switch (not shown). Thereby, the magnetization part 9 magnetizes the rotating shaft 5 and makes it a magnetization state, and maintains the magnetization state of this rotating shaft 5 during a steel plate washing | cleaning period. Here, the spray pipe 2 distributes the cleaning liquid 17 received from the cleaning liquid supply unit 12 in the predetermined distribution direction as described above. At this time, the discharge valve 2d of the spray pipe 2 is in a closed state, blocking the flow (discharge) of the cleaning liquid 17 from the discharge port 2c. As shown in FIG. 4, the magnetized rotating shaft 5 has a magnetic contaminant 19 in the cleaning liquid 17 that circulates in the spray pipe 2 in a predetermined flow direction (flow direction from the inlet side to the outlet side of the spray pipe 2). Is adsorbed by magnetic force. Thereby, the rotating shaft 5 in the magnetized state separates the cleaning liquid 17 flowing in the spray pipe 2 from the magnetic contaminants 19 existing in the spray pipe 2, and sufficiently removes the magnetic contaminants 19 from the cleaning liquid 17. Remove.

The magnetic contaminants 19 in the spray pipe 2 include, for example, magnetic contaminants originally contained in the cleaning liquid 17 that has flowed into the spray pipe 2, the brushes 6 a to 6 g and 7 a to 7 f of the rotating brush 4, and the spray pipe 2. And magnetic contaminants detached from the inner wall surface 2e.

After the above-described magnetization step, the cleaning liquid ejecting apparatus 1 sprays the cleaning liquid 17 after removing magnetic impurities flowing in the spray pipe 2 from the spray nozzles 3a to 3f onto the surface of the steel plate 14 to be cleaned (injecting step). . In this spraying step, as shown in FIG. 3, the spray pipe 2 passes the cleaning liquid 17 after removing the magnetic contaminants in the above-described flow direction, and then removes the magnetic contaminants to each of the spray nozzles 3a to 3f. The cleaning liquid 17 is circulated. Each of the spray nozzles 3a to 3f injects the cleaning liquid 17 after removing magnetic contaminants flowing from the spray pipe 2 onto the surface of the steel plate 14. At this time, as shown in FIG. 3, the spray nozzles 3a to 3f are not spread over the entire area in the width direction (see FIG. 1) of the steel plates 14 that are sequentially conveyed in the casing 10, and after the magnetic contaminants are removed. The cleaning liquid 17 is sprayed.

In the cleaning process of the steel plate 14 according to the first embodiment of the present invention, as described above, the surface of the steel plate 14 to which the cleaning liquid 17 after the removal of magnetic contaminants is sprayed is brushed by a rotating brush roll (not shown). . Thereby, deposits, such as rolling oil and iron powder, are removed from the surface of the steel plate 14. Then, the rinse process is performed with respect to the surface of the steel plate 14, and the washing process of the steel plate 14 is completed. The rinsing waste liquid 15 at the time of the rinsing process is collected by the waste liquid collecting unit 11 and reused for the cleaning of the steel plate 14 from the next time. In the cleaning liquid injection method according to the first exemplary embodiment of the present invention, the cleaning liquid supply step, the magnetization step, and the injection step described above are repeatedly performed sequentially or in parallel in the cleaning process of the continuously transported steel sheet 14.

On the other hand, in the cleaning liquid injection method according to the first exemplary embodiment of the present invention, after the cleaning process of the steel sheet 14 including the above-described cleaning liquid supply step, magnetization step, and injection step is continuously performed for a predetermined period, the cleaning liquid The inside of the spray pipe 2 of the injection device 1 is periodically cleaned online.

Specifically, in cleaning the inside of the spray pipe 2 in the cleaning liquid injection method according to the first exemplary embodiment of the present invention, the cleaning liquid injection device 1 reuses the rinse waste liquid 15 as shown in FIG. The cleaning liquid 17 is sequentially supplied to the spray pipe 2 (a cleaning liquid supply step for cleaning the pipe). At this time, as shown in FIG. 5, the waste liquid recovery unit 11 sequentially sends the rinse waste liquid 15 that has already been recovered to the cleaning liquid supply unit 12 through the pipe 13a, as in the case of cleaning the steel sheet surface described above. The cleaning liquid supply unit 12 mixes the rinse waste liquid 15 from the waste liquid recovery unit 11 and the new cleaning liquid 16 from the pipe 13b. Thereby, the cleaning liquid supply unit 12 reuses the rinse waste liquid 15 to generate the cleaning liquid 17 used for cleaning the inside of the spray pipe 2. The cleaning liquid supply unit 12 sequentially supplies such cleaning liquid 17 into the spray pipe 2 through the pipe 13c.

Next, the cleaning liquid ejecting apparatus 1 cancels the magnetization state of the rotating shaft 5 of the rotating brush 4 to make the rotating shaft 5 non-magnetized (magnetization eliminating step). In this magnetization elimination step, the magnetizing unit 9 separates the hard magnetic material brought into contact with the rotating shaft 5 for magnetization from the rotating shaft 5 by operating a predetermined changeover switch (not shown). Thereby, the magnetizing unit 9 switches the rotating shaft 5 magnetized by the above-described magnetization step from the in-tube cleaning period of the spray pipe 2 to the non-magnetized state, and during the in-tube cleaning period, the non-magnetized state of the rotating shaft 5 To maintain. The magnetizing unit 9 makes the rotating shaft 5 in a non-magnetized state in this way and releases magnetic impurities from the rotating shaft 5. As a result, the non-magnetized rotating shaft 5 releases the magnetic contaminants 19 adsorbed by the magnetic force in the magnetized state into the cleaning liquid 17 in the spray pipe 2 as shown in FIG.

Subsequently, the cleaning liquid ejecting apparatus 1 cleans the inside of the spray pipe 2 with the rotating brush 4 (in-pipe cleaning step). In this in-pipe cleaning step, the spray pipe 2 to be cleaned is in a state of being attached in the cleaning liquid ejecting apparatus 1 (for example, the casing 10), that is, in an online state. The rotating brush 4 rotates around the rotating shaft 5 supported by the spray pipe 2 when the operator rotates the handle 8.

At this time, the rotating shaft 5 of the rotating brush 4 rotates around the tube axis direction of the spray pipe 2 as shown in FIG. As the rotary shaft 5 rotates, the brushes 6 a to 6 g and 7 a to 7 f of the rotary brush 4 brush the inside of the spray pipe 2 while rotating in the outer peripheral direction of the rotary shaft 5. For example, as shown in FIG. 7, the

brushes

6 c and 7 c brush the inner wall surface 2 e of the spray pipe 2 and the inside of the spray nozzle 3 c while rotating in the outer peripheral direction of the rotating shaft 5. As illustrated in FIG. 7, the brushes 6a to 6g and 7a to 7f brush the inner wall surface 2e of the spray pipe 2 and the inner sides of the spray nozzles 3a to 3f, respectively, whereby the inner wall surface 2e and the spray nozzles 3a to 3f are brushed. The dirt is scraped off from each inner side of 3f as impurities. By rotating the handle 8 to rotate the handle 8, the rotation direction around the tube axis direction is appropriately switched to the opposite direction as shown in FIGS. Brush and clean.

The dirt (contaminants) removed from the inner surface of the inner wall surface 2e and the spray nozzles 3a to 3f by such brushing together with the magnetic contaminants released from the non-magnetized rotating shaft 5 as described above is applied to the spray pipe 2 It floats in the cleaning liquid 17 inside. Hereinafter, the contaminants removed as dirt and the magnetic contaminants 19 released from the non-magnetized rotating shaft 5 are collectively abbreviated as “various contaminants such as the magnetic contaminants 19” as appropriate.

Further, in this in-pipe cleaning step, as shown in FIG. 5, the cleaning liquid 17 is continuously flowed into the spray pipe 2 from the pipe 13c and flows in the flow direction from the inlet side to the outlet side of the spray pipe 2. On the other hand, the discharge valve 2d is switched from the closed state to the open state at a necessary timing, thereby allowing the waste liquid to be discharged from the discharge port 2c. At this time, the cleaning liquid 17 in the spray pipe 2 circulates vigorously in the above-described flow direction, while the magnetic impurities 19 from the rotating shaft 5 and the impurities remaining in the spray pipe 2 (for example, the brush 6b shown in FIG. 6). , 6c, 7a, 7b) are carried toward the discharge port 2c.

The cleaning liquid ejecting apparatus 1 passes through the discharge port 2c of the spray pipe 2 together with the cleaning liquid 17 used for cleaning the inside of the spray pipe 2 by the rotating brush 4 with the magnetic contaminants 19 released from the rotating shaft 5 by the above-described magnetization elimination step. Discharge to the outside. At the same time, the cleaning liquid ejecting apparatus 1 discharges impurities (dirt in the spray pipe 2) removed by brushing as described above together with the cleaning liquid 17 through the discharge port 2 c of the spray pipe 2. The cleaning liquid 17 used for cleaning the inside of the spray pipe 2, that is, the cleaning liquid 17 after cleaning the inside of the pipe, removes various kinds of contaminants such as magnetic impurities 19 in the spray pipe 2 as shown in FIG. 5. The waste cleaning liquid 18 is discharged from the outlet 2c to the outside (outside the line).

In the in-pipe cleaning step, various kinds of contaminants such as the flow of the cleaning liquid 17 in the spray pipe 2 described above, the brushing in the spray pipe 2 by the rotation of the rotating brush 4, and the magnetic contaminant 19 in the spray pipe 2 are removed. Discharge of the cleaning liquid 17 (cleaning waste liquid 18) after cleaning in the pipe is continuously or sequentially performed until online cleaning of the spray pipe 2 is completed. In the cleaning liquid injection method according to the first exemplary embodiment of the present invention, after the online cleaning of the spray pipe 2 is completed, the cleaning process of the steel plate 14 including the above-described cleaning liquid supply step, magnetization step, and injection step is resumed. Is done.

In the above-described in-pipe cleaning step, each of the spray nozzles 3a to 3f closes the injection port by operating a changeover switch (not shown) or the like, and stops the injection of the cleaning liquid 17 onto the surface of the steel plate 14. . In such a state, the spraying of the cleaning liquid 17 onto the surface of the steel plate 14 can be performed by another cleaning liquid spraying device. For example, a plurality of cleaning liquid ejecting apparatuses 1 according to the first embodiment of the present invention are installed along the conveying direction of the steel plate 14, and the cleaning liquid 17 described above is ejected by the remaining ones other than those being cleaned. May be substituted.

In addition, in the above-described in-pipe cleaning step, when the product steel plate 14 is not passed through, such as through a dummy coil, the in-pipe cleaning of the spray pipe 2 is performed without opening the spray nozzles 3a to 3f. May be performed.

As described above, in the first embodiment of the present invention, the rotation axis of the rotating brush that cleans the inside of the spray pipe by rotating around the pipe axis direction of the spray pipe that circulates the cleaning liquid to the spray nozzle is magnetized. The magnetic contaminants in the cleaning liquid existing inside the spray pipe are adsorbed on the rotating shaft in this magnetized state, the magnetic contaminants are removed from the cleaning liquid, and the cleaning liquid after removing the magnetic contaminants is to be cleaned from the spray nozzle. Is sprayed on the surface of a metal plate such as a steel plate.

For this reason, before spraying from the spray nozzle, the cleaning liquid present in the spray pipe is separated from the magnetic contaminants in the cleaning liquid, and the separated magnetic contaminants are rotated by a rotating brush arranged in the spray pipe. While being kept on the shaft, the cleaning liquid separated from the magnetic impurities can be sprayed from the spray nozzle onto the surface of the metal plate. As a result, even if the rinsing waste liquid collected during the rinsing process on the surface of the metal plate is reused as the cleaning liquid, the amount of magnetic contaminants outflow caused by the spraying of the cleaning liquid from the spray nozzle can be reduced as much as possible. it can. As a result, when the cleaning liquid is sprayed from the spray nozzle to clean the surface of the metal plate, the adhesion amount of magnetic contaminants at the spray nozzle outlet is reduced to prevent clogging of the spray nozzle, and iron powder, etc. It is possible to suppress a situation where the magnetic contaminants are jetted onto the surface of the metal plate to be cleaned together with the cleaning liquid.

By applying the present invention to the cleaning process of the metal plate surface, the metal plate surface to be cleaned can be sufficiently cleaned while reusing the rinse waste liquid as the cleaning liquid. As a result, resources such as water and costs are saved, and metal particulates such as iron powder that cause the appearance of the surface of the metal plate to deteriorate in the next step (for example, annealing step) of the surface of the metal plate, Since it can be sufficiently removed from the surface of the plate, it is possible to suppress, as much as possible, appearance defects such as pressing of the surface of the metal plate caused by the metal particulate matter.

In Embodiment 1 of the present invention, the rotating shaft of the rotating brush in the spray pipe is magnetized during the period of cleaning the metal plate surface, and magnetic impurities in the spray pipe are adsorbed on the rotating shaft in the magnetized state. The magnetic contaminants are removed from the cleaning liquid in the spray pipe, and the spray pipe is cleaned (in-pipe cleaning period). As described above, the magnetized rotating shaft is switched from the magnetized state to the non-magnetized state. The adsorbed magnetic contaminants are released from the rotating shaft. Furthermore, during this pipe cleaning period, the inside of the spray pipe is cleaned with a rotating brush, and the magnetic contaminants released as described above are removed through the spray pipe discharge port together with the cleaning liquid used for cleaning the spray pipe with the rotating brush. Is discharged.

For this reason, the inside of the spray pipe can be cleaned online without removing the spray pipe outside the cleaning process line, and the magnetic contaminants in the spray pipe are adsorbed to the rotating shaft of the rotating brush and the rotating shaft is adsorbed. The magnetic contaminants can be periodically discharged from the spray pipe to the outside of the line by switching the state in which the magnetic contaminants are released into the cleaning liquid in the spray pipe at appropriate times. As a result, it is possible to prevent the magnetic contaminants from remaining excessively in the spray pipe. As a result, the magnetic contaminants from the spray nozzle are prevented from flowing out, and the spray nozzle is effectively prevented from being clogged. be able to.

(Embodiment 2)
Next, a second embodiment of the present invention will be described. In the first embodiment described above, the hard magnetic body (permanent magnet or the like) of the magnetizing unit 9 that switches the rotating shaft 5 of the rotating brush 4 between the magnetized state and the non-magnetized state is disposed outside the rotating shaft 5. In the second embodiment, a hard magnetic body for switching between a magnetized state and a non-magnetized state is provided in the rotating shaft of the rotating brush 4.

FIG. 8 is a diagram illustrating a configuration example of the cleaning liquid ejecting apparatus according to the second embodiment of the present invention. As shown in FIG. 8, the cleaning liquid ejecting apparatus 21 according to the second embodiment includes a rotating shaft 25 instead of the rotating shaft 5 of the rotating brush 4 of the cleaning liquid ejecting apparatus 1 according to the first embodiment described above, and is magnetized. Instead of the part 9, a magnetized part 29 is provided. Other configurations are the same as those of the first embodiment, and the same reference numerals are given to the same components.

In the second embodiment, the rotating shaft 25 of the rotating brush 4 has a hollow structure that can include the hard magnetic body 29a of the magnetizing portion 29, and is formed using a magnetic member and a non-magnetic member. FIG. 9 is a diagram illustrating a configuration example of the rotating shaft of the rotating brush according to the second embodiment of the present invention. FIG. 10 is a diagram showing a structural example of a cross section taken along line BB of the rotating shaft shown in FIG.

As shown in FIGS. 9 and 10, the rotary shaft 25 is configured to have a slender bar-shaped outer shape by combining a magnetic shaft portion 25a and a nonmagnetic shaft portion 25b. The magnetic shaft portion 25a is a shaft portion capable of switching between a magnetized state and a non-magnetized state in the rotating shaft 25, and is formed using a soft magnetic material such as iron or steel. The nonmagnetic shaft portion 25b is a non-magnetized shaft portion of the rotary shaft 25, and is formed using a nonmagnetic material. The magnetic shaft portion 25a is separated across the nonmagnetic shaft portion 25b as shown in FIGS. At this time, the separated pair of magnetic shaft portions 25a face each other in the radial direction of the rotating shaft 25 as shown in FIG. The spaced apart portions of the nonmagnetic shaft portion 25b interposed between the pair of magnetic shaft portions 25a oppose each other in the radial direction of the rotating shaft 25, as shown in FIG.

Further, as shown in FIGS. 9 and 10, the rotating shaft 25 has a hollow structure designed in accordance with the size of the hard magnetic body 29 a of the magnetized portion 29. The rotating shaft 25 encloses the hard magnetic material 29a inside the hollow structure (see FIG. 10). The hollow structure of the rotary shaft 25 only needs to be formed at least inside the shaft from the base end portion (end portion on the handle 8 side) of the rotary shaft 25 to the position where the hard magnetic body 29a is incorporated. It may be formed over the entire region in the longitudinal direction.

In the second embodiment, the configuration of the rotary shaft 25 is the same as that of the rotary shaft 4 of the rotary brush 4 in the first embodiment except for the combination configuration of the magnetic shaft portion 25a and the nonmagnetic shaft portion 25b described above and the hollow structure. The same.

The magnetizing unit 29 magnetizes the rotating shaft 25 of the rotating brush 4 so that it can be switched between a magnetized state and a non-magnetized state. Specifically, as shown in FIGS. 8 to 10, the magnetization unit 29 includes a hard magnetic body 29a, a switching unit 29b, and a drive shaft 29c.

The hard magnetic body 29a is configured using a permanent magnet or the like, and is incorporated into the rotating shaft 25 of the rotating brush 4 so as to be rotatable and slidable along the inner peripheral surface of the rotating shaft 25. At this time, the hard magnetic body 29a brings the end of the N pole and the end of the S pole into contact with either the magnetic shaft portion 25a or the nonmagnetic shaft portion 25b of the rotary shaft 25.

The switching unit 29b is for switching the rotating shaft 25 of the rotating brush 4 between a magnetized state and a non-magnetized state. Specifically, as shown in FIG. 8, the switching portion 29 b is rotatably provided on the outer wall portion on the knob side (grip portion side) of the handle 8. One end of the drive shaft 29c is fixed to the switching unit 29b. The other end of the drive shaft 29c is fixed to the hard magnetic body 29a in the rotary shaft 25. The switching unit 29b rotates independently of the handle 8 according to the rotation operation of the operator, and accordingly, the hard magnetic body 29a is rotated about the longitudinal axis of the rotation shaft 25 together with the drive shaft 29c. The switching unit 29b switches the rotating shaft 25 between a magnetized state and a non-magnetized state by the rotation of the hard magnetic body 29a.

The magnetizing unit 29 having the above-described configuration rotates the hard magnetic body 29a in the rotating shaft 25 along the inner peripheral surface of the rotating shaft 25 in accordance with the rotation of the switching unit 29b. Set to a non-magnetized state. FIG. 11 is a diagram for explaining switching between the magnetization state and the non-magnetization state of the rotation axis of the rotary brush according to the second embodiment of the present invention.

The magnetizing unit 29 rotates and slides the hard magnetic body 29a in the rotating shaft 25 of the rotating brush 4 along the inner peripheral surface of the rotating shaft 25 as the switching unit 29b rotates. Thereby, as shown in FIG. 11, the magnetized portion 29 has a pair of magnetic shaft portions 25 a separated from each other with the nonmagnetic shaft portion 25 b interposed between the magnetic poles (N pole and S) of the hard magnetic body 29 a. The end of the pole). As a result, the magnetizing portion 29 magnetizes the pair of magnetic shaft portions 25a to the N-pole and the S-pole, and switches the entire rotating shaft 25 from the non-magnetized state to the magnetized state (FIG. Is shown).

In addition, the magnetizing unit 29 rotates and slides the hard magnetic body 29a in the rotating shaft 25 along the inner peripheral surface of the rotating shaft 25 in accordance with the rotation of the switching unit 29b to a position different from the case of the magnetized state described above. . Thereby, as shown in FIG. 11, the magnetized portion 29 brings the end portions of the magnetic poles of the hard magnetic body 29a into contact with each other across the magnetic shaft portion 25a and the nonmagnetic shaft portion 25b. Thus, a magnetic closed circuit is formed by the hard magnetic body 29a and the magnetic shaft portion 25a (FIG. 11 shows an image of magnetic lines of force in this magnetic closed circuit by a broken line). As a result, the magnetization unit 29 cancels the magnetization state of the pair of magnetic shaft portions 25a and switches the entire rotation shaft 25 from the magnetization state to the non-magnetization state.

On the other hand, the cleaning liquid ejecting method according to the second exemplary embodiment of the present invention is the cleaning liquid ejecting according to the first exemplary embodiment other than the switching method between the magnetization state and the non-magnetized state of the rotating shaft 25 of the rotating brush 4 by the magnetizing unit 29 described above. The method is the same.

Specifically, in the magnetization step of the cleaning liquid ejecting method according to the second embodiment, the magnetizing unit 29 rotates the rotating shaft 25 of the rotating brush 4 in accordance with the rotating operation of the switching unit 29b by the operator during the steel plate cleaning period of the cleaning process. The inner hard magnetic body 29a is rotated and slid to bring the hard magnetic body 29a into contact with the magnetic shaft portion 25a of the rotating shaft 25 as shown in FIG. Thereby, the magnetization part 29 magnetizes the magnetic shaft part 25a, and makes the whole rotating shaft 25 a magnetization state. At this time, the cleaning liquid ejecting device 21 causes the rotating shaft 25 magnetized by the magnetizing unit 29 to adsorb the magnetic impurities 19 in the cleaning liquid 17 existing inside the spray pipe 2 (see FIG. 4). And the magnetic contaminants 19 are separated, and the magnetic contaminants 19 are removed from the cleaning liquid 17 in the spray pipe 2.

In the magnetization elimination step of the cleaning liquid ejection method according to the second embodiment, the magnetizing unit 29 rotates the rotating brush 4 according to the on-line cleaning period of the spray pipe 2 and the rotation operation of the switching unit 29b by the operator. By rotating and sliding the hard magnetic body 29a in the shaft 25, as shown in FIG. 11, the ends of the magnetic poles of the hard magnetic body 29a are brought into contact with each other across the magnetic shaft portion 25a and the nonmagnetic shaft portion 25b. Let Thereby, the magnetization part 29 cancels | releases the magnetization state of the magnetic shaft part 25a, and makes the whole rotating shaft 25 a non-magnetization state. At this time, the cleaning liquid ejecting device 21 releases the magnetic impurities 19 adsorbed on the rotating shaft 25 by the magnetic force from the rotating shaft 25 switched to the non-magnetized state by the magnetizing unit 29 into the cleaning liquid 17 in the spray pipe 2. (See FIG. 6).

As described above, in Embodiment 2 of the present invention, the rotation shaft of the rotating brush is divided into a magnetic shaft portion made of a magnetic material (specifically, a soft magnetic material) and a nonmagnetic shaft portion made of a nonmagnetic material. The hard magnetic material of the magnetized portion is provided inside the rotating shaft so as to be able to rotate and slide along the inner peripheral surface of the rotating shaft, and the longitudinal direction of the rotating shaft is the center of rotation. By rotating the hard magnetic material, the rotation axis is switched between a magnetized state and a non-magnetized state, and the others are configured in the same manner as in the first embodiment. For this reason, while exhibiting the same effect as the case of Embodiment 1 mentioned above, the magnetized state of the rotating shaft of the rotating brush when adsorbing magnetic contaminants by magnetic force and the adsorbed magnetic contaminants are released. At this time, the non-magnetized state of the rotating shaft of the rotating brush can be more easily switched.

In the first and second embodiments described above, the magnetization unit that switches between the magnetization state and the non-magnetization state of the rotating shaft of the rotary brush using a hard magnetic material such as a permanent magnet is illustrated. It is not limited. In the present invention, the magnetizing unit includes an electromagnet instead of the hard magnetic material, and switches the current supplied to the electromagnet on and off, and switches whether or not the magnetic field is generated by the electromagnet. May be switched between a magnetized state and a non-magnetized state.

In

Embodiments

1 and 2 described above, the cleaning liquid containing the rinse waste liquid is used for cleaning the spray pipe, but the present invention is not limited to this. In the present invention, the cleaning liquid used for cleaning the inside of the spray pipe may be one that reuses the rinse waste liquid, may be the rinse waste liquid itself, or may be a new cleaning liquid that does not contain the rinse waste liquid. Good.

Furthermore, in the first and second embodiments described above, the rotation shaft is provided with six spray nozzles arranged in the longitudinal direction (tube axis direction) of the spray pipe and 13 brushes extending in the opposite direction. Although the cleaning liquid ejecting apparatus including the brush is exemplified, the present invention is not limited to this. The number of spray nozzles provided in the spray pipe is not limited to six, and may be one or two or more (plural). Similarly, the number of brushes provided on the rotating shaft of the rotating brush is not limited to 13 and may be one or more. That is, in the present invention, the number of spray nozzles arranged in the spray pipe and the number of brushes arranged in the rotating brush are not particularly limited. Further, the position and direction of each brush provided on the rotating brush are not particularly limited.

In the first and second embodiments described above, the cleaning liquid ejecting apparatus in which the discharge port is provided at the end of the spray pipe that is a flow pipe has been exemplified. As described above, in the in-pipe cleaning step, the dummy coil is passed through. For example, when the steel plate of the product is not passed, the spray liquid after cleaning the spray pipe may be discharged by using the spray nozzle as the discharge port. That is, the spray nozzle may have a function as a waste liquid discharge port.

In the first and second embodiments described above, the cleaning liquid injection device and the cleaning liquid injection method applied to the cleaning process before the annealing process are exemplified, but the present invention is not limited to this. The cleaning liquid ejecting apparatus and the cleaning liquid ejecting method according to the present invention may be applied to a cleaning process for cleaning the surface of a metal plate to be cleaned before a process other than the annealing process.

Furthermore, in

Embodiments

1 and 2, the steel plate is exemplified as the metal plate to be cleaned, but the present invention is not limited to this. In the present invention, the metal plate to be cleaned may be a steel plate or an iron alloy plate other than the steel plate. Further, the form of the metal plate to be cleaned may be any of a thin plate, a thick plate, and a strip plate.

Further, the present invention is not limited to the above-described first and second embodiments, and the present invention includes a configuration in which the above-described constituent elements are appropriately combined. In addition, all other embodiments, examples, operation techniques, and the like made by those skilled in the art based on the first and second embodiments are included in the present invention.

As described above, the cleaning liquid ejecting apparatus and the cleaning liquid ejecting method according to the present invention are useful for injecting the cleaning liquid onto the surface of the metal plate to be cleaned, and in particular, prevent clogging of the injection nozzle that injects the cleaning liquid, and iron The present invention is suitable for a cleaning liquid ejecting apparatus and a cleaning liquid ejecting method capable of suppressing a situation where foreign substances such as powder are sprayed onto a metal plate surface to be cleaned together with a cleaning liquid.

1, 21 Cleaning fluid injection device 2

Spray pipe

2a, 2b Shaft support

2c Discharge port

2d Discharge valve 2e Inner wall surface 3a-3f Spray nozzle 4

Rotating brush

5, 25 Rotating shaft 6a-6g, 7a-7f Brush 8

Handle

9, 29 Magnetization Part 10 Case 11 Waste liquid recovery part 12 Cleaning liquid supply part 13a to 13c Piping 14 Steel plate 15 Rinse waste liquid 16 New cleaning liquid 17 Cleaning liquid 18 Cleaning waste liquid 19 Magnetic contaminants 25a Magnetic shaft part 25b Nonmagnetic shaft part 29a Hard magnetic body 29b Switching part 29c Drive shaft

Claims

A flow pipe for flowing the cleaning liquid to the injection nozzle;
A rotating brush that rotates around the axial direction of the flow pipe and a brush provided along the longitudinal direction of the rotary shaft, and that cleans the inside of the flow pipe;
A magnetizing portion for magnetizing the rotation axis;
After the magnetic contaminants are removed by adsorbing the magnetic contaminants in the cleaning liquid existing inside the flow pipe to the rotating shaft magnetized by the magnetizing unit, and removing the magnetic contaminants from the cleaning liquid. The cleaning liquid spraying apparatus is characterized in that the cleaning liquid is sprayed from the spray nozzle onto the surface of the metal plate to be cleaned.
The rotating shaft is formed using a soft magnetic material,
The magnetizing unit magnetizes the rotating shaft to clean the metal plate surface to remove the magnetic contaminants from the cleaning liquid, and cleans the inside of the flow pipe from the magnetized state. Switch to the magnetized state, release the magnetic impurities from the rotating shaft,
The flow pipe has a discharge port, and discharges the magnetic contaminants released together with the cleaning liquid used for cleaning the inside of the flow pipe by the rotating brush through the discharge port. The cleaning liquid ejecting apparatus according to claim 1.
Rotating around the axial direction of the flow pipe that circulates the cleaning liquid to the spray nozzle to magnetize the rotary shaft of the rotary brush that cleans the inside of the flow pipe, and the magnetized state of the rotary shaft exists inside the flow pipe A magnetic step of adsorbing magnetic contaminants in the cleaning liquid to remove the magnetic contaminants from the cleaning liquid;
An injection step of injecting the cleaning liquid after removing magnetic impurities from the injection nozzle onto the surface of the metal plate to be cleaned;
A cleaning liquid spraying method comprising:
Demagnetization step of canceling the magnetization state of the rotation axis and making the rotation axis non-magnetization state;
In-pipe cleaning step for cleaning the inside of the flow pipe with the rotating brush;
Further including
In the magnetization step, the rotating shaft formed using a soft magnetic material is magnetized for a period of cleaning the surface of the metal plate to remove the magnetic impurities from the cleaning liquid,
In the demagnetization step, the rotating shaft magnetized by the magnetizing step is switched from a magnetized state to a non-magnetized state for a period of cleaning the inside of the flow pipe, and the magnetic impurities are released from the rotating shaft,
In the in-pipe cleaning step, the magnetic contaminants released in the magnetization elimination step are discharged to the outside through the outlet of the flow pipe together with the cleaning liquid used for cleaning the inside of the flow pipe by the rotating brush. The cleaning liquid injection method according to claim 3.