KR102643614B1 - Removing apparatus and method of iron particles in steel coating solution - Google Patents

Abstract

The iron removal device in the steel sheet coating solution includes a permanent magnet ring, a knife, and a contact control unit. The permanent magnet ring is installed on the lower coating roll, is partially submerged in the coating solution in the storage tank, and adsorbs iron in the coating solution by magnetic force. The knife is installed around the permanent magnet ring, and when it comes into contact with the permanent magnet ring, it scrapes off the iron adsorbed on the permanent magnet ring. The contact control part is coupled to the support part that holds the knife and includes an electromagnet that is electrically connected to the knife. When power is supplied to the electromagnet, the knife is magnetized and the knife is brought into close contact with the permanent magnet ring.

Description

Apparatus and method for removing iron in steel plate coating solution {REMOVING APPARATUS AND METHOD OF IRON PARTICLES IN STEEL COATING SOLUTION}

The present invention relates to an apparatus and method for removing iron from the coating solution used when coating an insulating film on an electrical steel sheet.

Non-oriented electrical steel sheets, which have uniform magnetic properties in all directions, are widely used in the iron cores of motors and generators, electric motors, and small transformers. When non-oriented electrical steel is used for the EI core, it has an insulating film that provides a high level of insulation to minimize interlayer current loss.

The insulating film coating device includes an upper coating roll and a lower coating roll located on the upper and lower sides of the strip, respectively. A portion of the lower coating roll is immersed in the coating solution in the storage tank, and the upper coating roll can receive the coating solution by a sprayer, etc. When the strip passes between the rotating upper and lower coating rolls, the coating solution on the upper and lower coating rolls is transferred to the strip, forming an insulating film.

Iron powder (scale) remains on the surface of the strip oxidized in the annealing furnace, and during the process of coating the insulating film, the iron on the surface of the scale falls into the coating solution in the storage tank. Therefore, as the process time increases, the iron content in the coating solution increases, and iron adheres to the lower coating roll. And this phenomenon leads to coating defects on the strip surface.

In order to prevent coating defects in the strip, conventionally, the lower coating roll was frequently replaced or defects in the lower coating roll were removed manually, such as by an operator directly brushing the surface of the lower coating roll. However, in the former case, productivity decreases, and in the latter case, there is a risk of safety accidents.

The present invention seeks to provide a device and method for removing iron in a coating solution of a steel plate that can efficiently remove iron that has fallen into the coating solution, thereby increasing the replacement cycle of the coating roll and minimizing maintenance work on the coating roll by the operator.

A device for removing iron in a steel sheet coating solution according to an embodiment of the present invention includes a permanent magnet ring, a knife, and a contact control unit. The permanent magnet ring is installed on the lower coating roll, is partially submerged in the coating solution in the storage tank, and adsorbs iron in the coating solution by magnetic force. The knife is installed around the permanent magnet ring, and when it comes into contact with the permanent magnet ring, it scrapes off the iron adsorbed on the permanent magnet ring. The contact control part is coupled to the support part that holds the knife and includes an electromagnet that is electrically connected to the knife. When power is supplied to the electromagnet, the knife is magnetized and the knife is brought into close contact with the permanent magnet ring.

The lower coating roll may include a first rotating shaft and a first coating roll. The permanent magnet rings may be installed as a pair on the first rotation axis so as to contact both sides of the first coating roll, and may have an outer diameter smaller than the diameter of the first coating roll.

The knife may be made of a square metal plate, and may include a blade with an inclined upper surface located at a front end facing the permanent magnet ring, and an iron collection groove for collecting iron scraped by the blade. An iron drain pipe is connected to the iron collection groove, so that the iron collected in the iron collection groove can be discharged to the outside.

The support portion may include a fixing holder surrounding the rear portion of the knife, at least one fixing bolt penetrating the upper side of the fixing holder to press the knife, and a head frame coupled to the fixing holder via a hinge.

The head frame may include a horizontal support positioned below the fixed holder and a vertical support fixed to a rear end of the horizontal support. The hinge may be fixed to the inside of the vertical support, and may be coupled to both left and right sides behind the fixed holder.

Electromagnets can be installed in pairs on the bottom of the fixed holder and the top of the horizontal support. The contact control unit may further include a pressure control rod installed on the support unit to control the contact strength of the permanent magnet ring and the knife.

The pressure control rod includes a screw rod that penetrates the fixed holder, the knife, and the horizontal support in a vertical direction, a first spring fitted around the screw rod between the fixed holder and the horizontal support, and a second spring fitted around the screw rod on the fixed holder, It may include a pair of fixing nuts coupled to both ends of the threaded rod. A pair of guide tubes with an inner diameter larger than the diameter of the threaded rod may be installed on the fixed holder, knife and horizontal support.

The switch that controls the power supply to the electromagnet can be connected to a timer. The electromagnet can be supplied with power for the on time set in the timer, and the power supply can be cut off for the off time set in the timer.

The device for removing iron in the steel sheet coating solution may further include a moving part that moves the knife and the support part along the longitudinal direction of the lower coating roll. The moving part may include a screw shaft that rotates by a motor, a moving frame that is coupled to the screw shaft and moves linearly when the screw shaft rotates, and is fixed to the head frame, and a rail guide that guides the moving frame.

The method for removing iron in a steel sheet coating solution according to an embodiment of the present invention includes an iron adsorption step, an iron separation step, and an iron discharge step. In the iron adsorption step, a permanent magnet ring is installed on the lower coating roll, and when the lower coating roll operates, a part of the permanent magnet ring rotates while submerged in the coating solution, so that the iron in the coating solution is magnetically adsorbed to the permanent magnet ring. In the iron separation step, a knife is installed around the permanent magnet ring, and the knife is temporarily magnetized by an electromagnet and comes into close contact with the permanent magnet ring to scrape off the iron adsorbed on the permanent magnet ring. In the iron discharge step, the iron scraped by the knife collects in the iron collection groove provided on the knife, and the iron is discharged to the outside through the iron drain pipe.

The knife can be magnetized when the electromagnet is powered, and can be coupled to a pressure control rod with two springs so that it returns to its initial position when the electromagnet is turned off and the strength of contact with the permanent magnet ring can be controlled.

According to this embodiment, by efficiently removing the iron dispersed in the coating solution, it is possible to prevent iron sticking to the coating roll and coating defects in the strip resulting from this. In addition, productivity can be increased by increasing the replacement cycle of the coating roll, and the risk of safety accidents can be reduced by minimizing maintenance work on the coating roll by workers.

Figure 1 is a side view of a general insulating film coating device.
Figure 2 is a side view of an apparatus for removing iron in a steel plate coating solution according to an embodiment of the present invention.
Figure 3 is a plan view of the iron removal device shown in Figure 2.
Figure 4 is an enlarged view of the iron separation part of the iron removal device shown in Figure 2.
Figure 5 is a plan view showing the standby state of the iron removal device.
Figure 6 is a side view showing the operating state of the insulating film coating device with a permanent magnet ring installed.
Figure 7 is a side view showing the iron separation unit in an open state.
Figure 8 is a side view showing the closed state of the iron separation unit.

Hereinafter, with reference to the attached drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the present invention. The present invention may be implemented in many different forms and is not limited to the embodiments described herein.

Figure 1 is a side view of a general insulating film coating device.

Referring to Figure 1, a general insulating film coating device has an upper coating roll 11 and a lower coating roll 12 located on the upper and lower sides of the strip S, respectively, and is located below the lower coating roll 12. It includes a storage tank (14) for storing the coating solution (13).

The lower coating roll 12 includes a first rotating shaft 121 and a first coating roll 122 made of rubber installed on the first rotating shaft 121. The upper coating roll 11 includes a second rotating shaft 111 and a second coating roll 112 made of rubber installed on the second rotating shaft 111. A portion of the lower side of the first coating roll 122 is immersed in the coating solution 13 in the storage tank 14, and the second coating roll 112 can receive the coating solution by the spray device 15.

When the strip (S) passes between the rotating upper and lower coating rolls (11, 12), the coating solution on the first and second coating rolls (11, 12) is transferred to the strip (S) and is applied to the surface of the strip (S). An insulating film 16 is formed. In the process of forming the insulating film 16, the iron powder (scale) remaining on the surface of the strip S falls into the coating solution 13, and the iron contained in the coating solution 13 adheres to the first coating roll 122. This happens.

Figure 2 is a side view of an iron removal device in a steel plate coating solution (hereinafter referred to as 'iron removal device' for convenience) according to an embodiment of the present invention, and Figure 3 is a plan view of the iron removal device shown in Figure 2. The iron removal device functions to prevent iron from adhering to the first coating roll 122 by removing iron contained in the coating solution.

Referring to Figures 2 and 3, the iron removal device of this embodiment includes a permanent magnet ring 20 installed on the lower coating roll 12, and a permanent magnet ring 20 that is attracted to the permanent magnet ring 20 when it comes into contact with the permanent magnet ring 20. It includes a knife 30 that scrapes iron, and a contact control unit 40 that controls the contact between the permanent magnet ring 20 and the knife 30. 2 and 3 show the permanent magnet ring 20 and the knife 30 being spaced apart from each other.

The iron removal device may include a moving part 50 that moves the knife 30 along the longitudinal direction of the lower coating roll 12. The permanent magnet ring 20 functions as an 'iron adsorption unit' that adsorbs iron dispersed in the coating solution, and the knife 30, contact control unit 40, and moving unit 50 are adsorbed to the permanent magnet ring 20. It constitutes an ‘iron separation unit’ that removes accumulated iron.

The permanent magnet ring 20 is installed on the first rotation shaft 121 so as to contact at least one side of the first coating roll 122. For example, a pair of permanent magnet rings 20 may be installed on the first rotation axis 121 and in contact with both sides of the first coating roll 122. In this case, a pair of iron separation units are disposed corresponding to a pair of permanent magnet rings 20.

The permanent magnet ring 20 has a smaller outer diameter than the first coating roll 122, and a portion of the lower side of the permanent magnet ring 20 is immersed in the coating solution together with the first coating roll 122. Therefore, while the lower coating roll 12 operates, the permanent magnet ring 20 rotates with the first coating roll 122 with a portion of it immersed in the coating solution, and the iron dispersed in the coating solution makes the permanent magnet ring ( 20) and is attracted to the permanent magnet ring (20).

Figure 4 is an enlarged view of the iron separation part of the iron removal device shown in Figure 2.

Referring to Figures 3 and 4, the knife 30 is made of a square metal plate, and forms a sharp blade 31 with an inclined upper surface at the front end facing the permanent magnet ring 20. An iron collection groove 32 may be located in the knife 30 behind the blade 31 to collect the scraped iron. Additionally, the iron drain pipe 33 is connected to the opening formed in the iron collecting groove 32 to discharge the iron to the outside.

The knife 30 is coupled to the support portion 60 and is firmly supported. The support portion 60 includes a fixing holder 61 surrounding the rear half of the knife 30, at least one fixing bolt 62 that penetrates the upper side of the fixing holder 61 and presses the knife 30, and a hinge. It may include a head frame 64 coupled to the fixing holder 61 via (63).

The head frame 64 may be composed of a horizontal support 641 located below the fixed holder 61 and a vertical support 642 fixed to the rear end of the horizontal support 641. The hinge 63 is fixed to the inside of the vertical support 642 and is coupled to both left and right sides behind the fixed holder 61. The fixed holder 61 can rotate around the hinge 63.

The contact control unit 40 is coupled to the support unit 60 and controls the contact of the knife 30 with the permanent magnet ring 20. The contact control unit 40 may include an electromagnet 41 that magnetizes the knife 30 when power is supplied, and a pressure control rod 42 that adjusts the contact strength of the knife 30 with respect to the permanent magnet ring 20. You can.

The electromagnets 41 may be provided as a pair on the lower surface of the fixed holder 61 and the upper surface of the horizontal support 641, and a pair of electromagnets 41 are disposed at the front and rear of the pressure control rod 42, respectively. It can be. The knife 30, the fixing holder 61, and the electromagnet 41 are all made of metal and are electrically connected.

The pressure control rod 42 is provided between a screw rod 421 that penetrates the fixed holder 61, the knife 30, and the horizontal support 641 in the vertical direction, and the fixed holder 61 and the horizontal support 641. A first spring 422 fitted around the screw rod 421, a second spring 423 fitted around the screw rod 421 on the fixing holder 61, and coupled to both ends of the screw rod 421. It may include a pair of fixing nuts 424.

When power is supplied to the electromagnet 41, the fixed holder 61 and the knife 30 become magnets, and the knife 30, which has become a magnet, is attracted to the permanent magnet ring 20 and rotates around the hinge 63. , the blade 31 of the knife 30 sticks to the permanent magnet ring 20. At this time, the first spring 422 is compressed by the attractive force of the knife 30 and the permanent magnet ring 20, and the second spring 423 is stretched.

When the knife 30 contacts the permanent magnet ring 20, the fixed holder 61 and the knife 30 and the horizontal support 641 are installed so that the pressure adjustment rod 42 does not interfere with the inclination of the knife 30. A pair of guide tubes 65 having an inner diameter larger than the diameter of the threaded rod 421 may be located.

When the power supply to the electromagnet 41 is stopped, the knife 30 returns to its initial position by the restoring force of the first spring 422. The switch of the electromagnet 41 is connected to a timer and can supply power to the electromagnet 41 for the on time set in the timer, and can block the power supply to the electromagnet 41 for the off time set in the timer. there is.

In this way, the contact control unit 40 can control the contact of the knife 30 with the permanent magnet ring 20 depending on whether or not power is supplied to the electromagnet 41. Additionally, the contact strength between the permanent magnet ring 20 and the knife 30 can be controlled by adjusting the pressure of the first and second springs 422 and 423 according to the degree of tightening of the fixing nut 424.

The moving unit 50 moves the entire knife 30, support unit 60, and contact control unit 40 along the longitudinal direction of the lower coating roll 12. The moving part 50 includes a screw shaft 52 coupled to the motor 51, a moving frame 53 coupled to the screw shaft 52, and a rail guide 54 that guides the moving frame 53. can do. The screw shaft 52 is located parallel to the first rotation shaft 121.

The moving frame 53 is fixed to the rear of the vertical support 642 of the head frame 64, and moves linearly when the screw axis 52 rotates to move the head frame 64 and the knife 30. The forward and backward directions of the moving frame 53 are determined according to the rotation direction of the screw shaft 52, and the movement amount of the moving frame 53 is determined according to the rotation amount of the screw shaft 52. The rail guide 54 may be provided as a pair on the upper and lower sides of the moving frame 53.

Next, a method of removing iron using an iron removal device will be described. The method of removing iron in the steel sheet coating solution according to this embodiment includes an iron adsorption step in which iron in the coating solution is adsorbed to the permanent magnet ring by magnetic force, and a knife is brought into close contact with the permanent magnet ring to scrape the iron adsorbed on the permanent magnet ring. It includes an iron separation step and an iron discharge step in which the iron scraped by the knife is discharged to the outside of the knife.

Figure 5 is a plan view showing the standby state of the iron removal device. Referring to FIG. 5, the permanent magnet ring 20 is pre-installed on the first rotation axis 121 of the lower coating roll 12, and the knife 30 is connected to the permanent magnet ring along the longitudinal direction of the first rotation axis 121. Wait at the home position away from (20).

Figure 6 is a side view showing the operating state of the insulating film coating device with a permanent magnet ring installed. Referring to FIG. 6, an insulating film 16 is formed on the surface of the strip S by operating the upper and lower coating rolls 11 and 12, and in this process, iron on the surface of the strip S falls into the coating solution. As a result, the iron content in the coating solution increases.

In the iron adsorption step, the lower part of the permanent magnet ring 20 is immersed in the coating solution, and while the lower coating roll 12 is operating, the permanent magnet ring 20 is partially immersed in the coating solution. It rotates together with the coating roll (122). In the process of rotating the permanent magnet ring 20, iron dispersed in the coating solution is adsorbed to the permanent magnet ring 20 by magnetic force.

Referring to FIG. 3, the operation of the motor 51 moves the moving frame 53, the head frame 64, and the knife 30 to face the permanent magnet ring 20. That is, the iron removal device moves from the standby position shown in FIG. 5 to the operating position shown in FIG. 3.

Figure 7 is a side view showing the iron separation unit in an open state. Referring to FIG. 7, when power is not supplied to the electromagnet 41 of the contact control unit 40, the blade 31 of the knife 30 is positioned at a predetermined distance from the permanent magnet ring 20. The state in which the permanent magnet ring 20 and the knife 30 are spaced apart is called an open state.

Stirring of the coating solution by rotation of the first coating roll 122 and the permanent magnet ring 20 and the magnetic force of the permanent magnet ring 20 cause iron in the coating solution to form a permanent magnet on both sides of the first coating roll 122. It is easily absorbed into the magnetic ring (20). As a result, iron in the coating solution stored in the storage tank 14 can be effectively removed.

Figure 8 is a side view showing the closed state of the iron separation unit.

Referring to FIG. 8, power is supplied to the electromagnet 41 of the contact control unit 40. Then, the fixed holder 61 and the knife 30 become magnets, and the knife 30, which has become a magnet, is attracted to the permanent magnet ring 20 and rotates around the hinge 63, so that the blade 31 is attached to the permanent magnet ring 20. It sticks at (20). The state in which the knife 30 is in close contact with the permanent magnet ring 20 is called a closed state.

In the iron powder separation step, the blade 31 is in close contact with the rotating permanent magnet ring 20, and thus the blade 31 scrapes off the iron adsorbed on the permanent magnet ring 20.

In the iron discharge step, the iron scraped by the knife 30 is collected in the iron collection groove 32 (see FIG. 4) along the inclined surface of the blade 31. And the iron collected in the iron collection groove 32 is discharged to the outside along the iron drain pipe 33 (see FIG. 4). In Figure 8, for convenience, the iron collection groove 32 and the iron drain pipe 33 are omitted.

The power supply to the electromagnet 41 can be controlled by a switch connected to a timer. For example, the switch of the electromagnet 41 can maintain the knife 30 in a closed state by supplying power to the electromagnet 41 for an on time set in the timer, and for an off time set in the timer. The knife 30 can be kept open by cutting off the power supply to the electromagnet 41.

In a closed state where the knife 30 is in close contact with the permanent magnet ring 20, the first spring 422 is compressed, the second spring 423 is stretched, and when the power supply to the electromagnet 41 is cut off, the first spring ( The knife 30 returns to the open state due to the restoring force of 422). At this time, the contact strength between the permanent magnet ring 20 and the knife 30 can be controlled by adjusting the pressure of the first and second springs 422 and 423 according to the degree of tightening of the fixing nut 424.

Meanwhile, in the above-described insulation film coating device, the upper coating roll 11 and the lower coating roll 12 are used alternately by changing their positions, so for convenience, there is at least one on the second rotation axis 111 of the upper coating roll 11. A permanent magnet ring (not shown) may be pre-installed.

According to the above-described iron removal device, iron dispersed in the coating solution can be efficiently removed to prevent iron sticking to the coating roll and coating defects in the strip resulting from this. In addition, productivity can be increased by increasing the replacement cycle of the coating roll, and the risk of safety accidents can be reduced by minimizing maintenance work on the coating roll by workers.

Although the preferred embodiment of the present invention has been described above, the present invention is not limited thereto, and can be implemented with various modifications within the scope of the claims, the detailed description of the invention, and the accompanying drawings, and this is also the present invention. It is natural that it falls within the scope of .

11: upper coating roll 12: lower coating roll
13: coating solution 14: reservoir
20: Permanent magnet ring 30: Knife
31: Blade 32: Iron collection groove
33: iron drain pipe 40: contact control unit
41: electromagnet 42: pressure control rod
50: moving part 60: support part
61: fixing holder 62: fixing bolt
63: Hinge 64: Head frame

Claims (12)

A permanent magnet ring installed on the lower coating roll, partially submerged in the coating solution in the storage tank, and adsorbing iron in the coating solution by magnetic force;
A knife installed around the permanent magnet ring and scraping off iron adsorbed on the permanent magnet ring when in contact with the permanent magnet ring; and
A contact control unit that is coupled to a support part that fixes the knife, includes an electromagnet that conducts electricity with the knife, and magnetizes the knife when power is supplied to the electromagnet to bring the knife into close contact with the permanent magnet ring;
A device for removing iron in a steel plate coating solution containing. According to paragraph 1,
The lower coating roll includes a first rotating shaft and a first coating roll,
The permanent magnet ring is installed as a pair on the first rotation shaft so as to contact both sides of the first coating roll, and has an outer diameter smaller than the diameter of the first coating roll. According to paragraph 1,
The knife is made of a square metal plate and includes a blade with an inclined upper surface located at a front end facing the permanent magnet ring, and an iron collection groove for collecting iron scraped by the blade,
An iron removal device in a steel plate coating solution in which an iron drain pipe is connected to the iron collection groove to discharge iron collected in the iron collection groove to the outside. According to paragraph 1,
The support portion is a steel plate including a fixing holder surrounding a rear portion of the knife, at least one fixing bolt penetrating an upper side of the fixing holder to press the knife, and a head frame coupled to the fixing holder via a hinge. Device for removing iron in coating solution. According to clause 4,
The head frame includes a horizontal support located below the fixed holder and a vertical support fixed to a rear end of the horizontal support,
The hinge is fixed to the inside of the vertical support, and the iron removal device in the steel plate coating solution is coupled to both left and right sides behind the fixed holder. According to clause 5,
The electromagnets are installed in pairs on the lower surface of the fixed holder and the upper surface of the horizontal support,
The contact control unit further includes a pressure control rod installed on the support unit to control the contact strength of the permanent magnet ring and the knife. According to clause 6,
The pressure control rod includes a screw rod that penetrates the fixed holder, the knife, and the horizontal support in a vertical direction, a first spring inserted around the screw rod between the fixed holder and the horizontal support, and a circumference of the screw rod on the fixed holder. A device for removing iron in a steel plate coating solution, including a second spring inserted into and a pair of fixing nuts coupled to both ends of the threaded rod. In clause 7,
A device for removing iron in a steel plate coating solution, wherein a pair of guide tubes having an inner diameter larger than the diameter of a threaded rod are installed on the fixed holder, the knife, and the horizontal support. According to clause 6,
The switch that controls the power supply to the electromagnet is connected to a timer,
The electromagnet is supplied with power for an on time set in the timer, and the power supply is cut off for an off time set in the timer. According to clause 4,
It further includes a moving part that moves the knife and the support part along the longitudinal direction of the lower coating roll,
The moving part includes a screw shaft rotated by a motor, a moving frame that is coupled to the screw shaft and moves linearly when the screw shaft rotates, and a moving frame fixed to the head frame, and a rail guide that guides the moving frame. Iron removal device. A permanent magnet ring is installed on the lower coating roll, and when the lower coating roll operates, a part of the permanent magnet ring rotates while submerged in the coating solution, so that iron in the coating solution is adsorbed to the permanent magnet ring by magnetic force;
A knife is installed around the permanent magnet ring, the knife is temporarily magnetized by an electromagnet and comes into close contact with the permanent magnet ring, thereby scraping off the iron adsorbed on the permanent magnet ring; and
an iron discharge step in which iron scraped by the knife is collected in an iron collection groove provided on the knife and the iron is discharged to the outside through an iron drain pipe;
Method for removing iron in a steel plate coating solution containing. According to clause 11,
The knife is magnetized when power is supplied to the electromagnet, is coupled to a pressure control rod with two springs, returns to the initial position when the electromagnet is turned off, and is coated with a steel plate whose contact strength with the permanent magnet ring is controlled. How to remove iron from solution.

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