A brush roll device and method for phosphor removal and polishing of hot rolled strip

Abstract

A kind of brush roller device and method applied to hot-rolled strip steel phosphorus removal and polishing, it is related to stainless steel production technical field, brush roller device includes brush roller main body, brush, spraying unit and brush detection unit, brush is covered on brush roller main body, the brush hardness of brush is gradually reduced from the both ends of brush roller main body to middle, the relative density of brush is gradually reduced from the both ends of brush roller main body to middle;Spraying unit is installed on the outside of brush roller main body, and spraying direction is aligned with brush roller main body;Brush detection unit is installed at the both ends of brush roller main body, in addition, the present application also mentions a kind of phosphorus removal and polishing method using the brush roller device;Combining the brush roller device and method of the present application, the output of annealing pickling can be effectively improved, the roughness of strip surface is reduced, the problems of brush roller mark on strip surface and uneven roughness of strip surface are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of stainless steel production, in particular to a brush roller device and method applied to phosphorus removal and polishing of hot-rolled strip steel. BACKGROUND

[0002] With the increasingly fierce competition in the stainless steel industry, quality and yield have always been important indicators for major enterprises. Therefore, countless technical workers are making relevant research and innovation for the quality and yield of products to improve them at the same time.

[0003] In the production of stainless steel strip steel, the black coil of hot rolling needs to be annealed and pickled to become the final hot-rolled product. Annealing is mainly to perform solid solution treatment and recovery recrystallization treatment on the black coil of hot rolling, so as to achieve good use and processing performance. Pickling is to perform pickling and brushing treatment on the surface scale of the strip steel to remove the surface scale and obtain clean and beautiful white stainless steel.

[0004] In actual production, since the oxide film of stainless steel is relatively dense, it is difficult to pickle, so the pickling speed is slow, which has a serious impact on the yield of annealing and pickling. Similarly, since the surface roughness of annealing and pickling is affected by the surface of the hot-rolled raw material, it is difficult to control and stabilize the surface roughness, and it is even more difficult to reduce the surface roughness.

[0005] The invention patent with the application number 200310109666.2 discloses a brush roller cleaning method and brush roller in the pickling process of stainless steel hot-rolled plate. The invention patent provides a type and process method of brush roller, but it cannot solve the problem of brush roller marks of new brush roller (since the surface hardness of new brush roller is high when it is just put into use, the surface uniformity is not good, and brush roller marks will be generated on the surface of the strip steel). At the same time, the invention patent does not have the effects of efficient phosphorus removal and efficient polishing. In the production of hot-rolled plate, the temperature reduction speed of the edge part of the hot-rolled plate is greater than that of the core part, thereby causing the surface roughness after annealing and pickling to be uneven. In addition, since the two sides of the hot-rolled plate are in contact with oxygen more than the core part, the oxide film of the edge part is thicker than that of the core part, thereby causing the phosphorus removal efficiency of the edge part to be lower than that of the core part.

[0006] The invention patent with the application number 201710321605.4 discloses a cold-rolled annealing and pickling process for high-chromium and high-nickel stainless steel. The invention patent mentions the effect of oxidation removal of the cold-rolled annealing and pickling brush roller, but it belongs to light grinding, and the phosphorus removal effect is not as good as that of the hot annealing and pickling (heavy grinding). At the same time, it does not solve the problem of new roller brush marks and the problem of uneven roughness of the raw material. SUMMARY

[0007] In view of the deficiencies of the prior art, the application provides a brush roller device applied to phosphorus removal and polishing of hot-rolled stainless steel, and further provides a phosphorus removal and polishing method applying the brush roller device, so that the yield of annealing and pickling is effectively improved, the roughness of the strip steel surface is reduced, and the problems of brush roller marks and uneven roughness of the strip steel surface are solved.

[0008] To achieve the above object, the application provides the following technical scheme: a brush roller device applied to phosphorus removal and polishing of hot-rolled strip steel, comprising a brush roller body, brush hairs, a spraying unit and a brush hair detection unit; the brush hairs are covered on the brush roller body, the brush hair hardness of the brush hairs gradually decreases from both ends to the middle of the brush roller body, and the relative density of the brush hairs gradually decreases from both ends to the middle of the brush roller body; the spraying unit is installed on the outside of the brush roller body, and a spraying port is close to and directionally aligned with the brush roller body; and the brush hair detection unit is installed at both ends of the brush roller body.

[0009] The brush hair hardness and the relative density of the brush hairs also change correspondingly for different areas, effectively solving the problem of uneven roughness of the strip steel surface; the spraying unit can control the working temperature of the brush hairs through external water spraying, the water amount of spraying is dynamically adjusted according to the actual temperature of the brush hairs fed back by an infrared temperature sensor, the working temperature of the brush hairs is stably controlled within 50 DEG C, the strength of the brush hairs is ensured, and the effect of stable phosphorus removal is achieved; the brush hair detection unit can detect the length of the brush hairs, and automatically alarms when the length of the brush hairs is less than or equal to 20 mm, so as to prevent mechanical scratches caused by the contact between the brush roller core and the strip steel surface after the brush hairs are used up.

[0010] Further, the spraying unit comprises an infrared temperature sensor, and the infrared temperature sensor records the temperature of the brush hairs.

[0011] Further, the brush hair detection unit records the length position value of the brush hairs; and the change amount of the length position value of the brush hairs is a loss value of the brush hairs.

[0012] Further, an alarm is arranged on the brush hair detection unit, and the alarm automatically alarms when the length of the brush hairs is less than or equal to 20 mm.

[0013] When the length of the brush hairs is less than or equal to 20 mm, the alarm receives the length information fed back by the brush hair detection unit, and sends a warning signal to the outside by emitting a bright red warning and accompanying a harsh sound.

[0014] A strip steel preparation method applying the above brush roller device, characterized in that the method comprises:

[0015] New brush roller pretreatment: a new brush roller body is placed on a motor, the new brush roller is pressed on a steel plate, a 60KW-100KW motor rotating power is set, the motor is operated for a period of time, and finally the pretreated new brush roller is loaded into a production line.

[0016] The problem of brush roll marks caused by the hard bristles of the new brush roll is effectively solved.

[0017] The strip steel is subjected to phosphorus removal and polishing treatment: the brush roll device is divided into two groups, and each group has one brush roll body above and below the strip steel;

[0018] The first group of brush roll devices: the upper and lower brush roll bodies lift the strip steel upwards, the two brush roll bodies rotate along the direction of the strip steel running, the size of the rolling current on the surface of the strip steel gradually decreases from the two sides to the middle, and the rotating speed of the brush roll bodies is 900-1200 rpm;

[0019] The second group of brush roll devices: the upper and lower brush roll bodies lift the strip steel downwards, the two brush roll bodies rotate against the direction of the strip steel running, the size of the rolling current on the surface of the strip steel gradually decreases from the two sides to the middle, and the rotating speed of the brush roll bodies is 600-900 rpm, so that the semi-finished product of the strip steel (5) is obtained.

[0020] By controlling the rolling current of different areas of the brush roll in stages, controlling the forward and reverse rotation of the brush roll, and controlling the lifting of the strip steel upwards and downwards, the phosphorus removal efficiency is improved, and the problem of difficult phosphorus removal of the hot-rolled strip steel edge is effectively solved.

[0021] Further, the strip steel needs to be subjected to annealing, phosphorus breaking and shot blasting pretreatment before being subjected to phosphorus removal and polishing treatment.

[0022] Further, after the strip steel is subjected to phosphorus removal and polishing treatment, the strip steel is subjected to pickling, final cleaning and drying and coiling to obtain the finished product of the strip steel.

[0023] Compared with the prior art, the technical scheme of the present application has the following beneficial effects:

[0024] 1. In the present application, the bristle hardness and relative density of the bristles change correspondingly for different areas, effectively solving the problem of uneven roughness of the surface of the strip steel;

[0025] 2. In the present application, by controlling the rolling current of different areas of the brush roll in stages, controlling the forward and reverse rotation of the brush roll, and controlling the lifting of the strip steel upwards and downwards, the phosphorus removal efficiency is improved, and the problem of difficult phosphorus removal of the hot-rolled strip steel edge is effectively solved;

[0026] 3. In the present application, the infrared temperature sensor is arranged on the spraying unit, which can detect the actual temperature of the bristles and control the working temperature of the bristles through external water spraying. The amount of water sprayed is dynamically adjusted according to the actual temperature of the bristles, so that the working temperature of the bristles is stabilized within 50℃, the strength of the bristles is ensured, and the effect of stable phosphorus removal is achieved;

[0027] 4、The brush detection unit can detect the length of the brush, and automatically alarm when the length of the brush is ≤20mm, preventing the brush roller core from contacting the surface of the strip steel and causing mechanical scratches after the brush is used up;

[0028] 5、The present application pre-treats the new brush roller to prevent the problem of brush roller marks caused by the hard brush of the new brush roller. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a working schematic diagram of the brush roller device in the present application;

[0030] Figure 2 It is a schematic diagram of the brush roller device in the present application;

[0031] Figure 3 It is a process flow schematic diagram in the present application;

[0032] Figure 4 It is a schematic diagram of brush roller marks on the surface of the strip steel caused by the new brush roller;

[0033] Figure 5 It is a schematic diagram of the surface of the strip steel treated by the brush roller device and method in the present application;

[0034] Figure 6 It is a roughness schematic diagram of the surface of the strip steel treated by the brush roller device and method without using the present application;

[0035] Figure 7 It is a roughness schematic diagram of the surface of the strip steel in Example 1;

[0036] Figure 8 It is a roughness schematic diagram of the surface of the strip steel in Example 2;

[0037] Figure 9 It is a roughness schematic diagram of the surface of the strip steel in Example 3.

[0038] In the figure: 1-brush roller body, 2-brush, 3-spraying unit, 4-brush detection unit, 5-strip steel. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0040] Please refer to Figures 1-3The application discloses a brush roller device applied to phosphor removal and polishing of hot-rolled strip steel.

[0041] The spraying unit 3 is installed on the outside of the brush roller body 1, and the spraying port is close to and directionally aligned with the brush roller body 1; the spraying unit 3 is provided with an infrared temperature sensor, the infrared temperature sensor monitors and records the temperature of the brush 2; the water amount of the spraying unit is dynamically adjusted according to the actual temperature of the brush fed back by the infrared temperature sensor, so that the working temperature of the brush is stabilized within 50 DEG C, the strength of the brush is ensured, and the effect of stable phosphor removal is achieved.

[0042] The brush detection unit 4 is installed at the two ends of the brush roller body 1, and the brush detection unit records the length position value of the brush; the change amount of the brush length position value is the loss value of the brush; the brush detection unit 4 is provided with an alarm, when the length of the brush is less than or equal to 20 mm, the alarm receives the length information fed back by the brush detection unit, and sends a warning signal to the outside world by emitting a bright red warning and accompanying a loud noise, so that mechanical scratches caused by the contact between the brush roller core and the surface of the strip after the brush 2 is used up are prevented.

[0043] In addition, the application also discloses a strip preparation method applied to the brush roller device.

[0044] New brush roller pretreatment: the new brush roller is placed on the motor, the new brush roller is pressed on a steel plate, the motor rotating power of 60KW-100KW is set, and the new brush roller is run for a period of time, and finally the pretreated new brush roller is loaded into the production line; the problem of brush roller marks caused by the hard brush of the new brush roller is effectively solved; please refer to Figure 4 The new brush roller is not pretreated, and obvious roller marks are generated on the surface of the new brush roller, and please refer to Figure 6 The roughness effect of the surface of the strip is not treated by using the brush roller device and the method of the application, and the roughness of the two sides of the surface of the strip is obviously higher than that of the center, and the surface roughness is uneven.

[0045] The strip 5 needs to be annealed, phosphor broken and shot blasted before being subjected to phosphor removal and polishing treatment.

[0046] The strip 5 is subjected to brush roller treatment: the brush roller is divided into two groups, and each group has one brush roller body on the upper and lower strips.

[0047] The first set of brush roller devices: the upper and lower brush roller bodies 1 lift the strip steel 5 upwards, and the two brush roller bodies 1 rotate in the direction of the strip steel 5. The magnitude of the pressing current on the surface of the strip steel 5 decreases step by step from both sides of the strip steel to the middle. The rotation speed of the brush roller body 1 is 900-1200 rpm.

[0048] The second set of brush roller devices: the upper and lower brush roller bodies 1 push the strip steel 5 downwards, and the two brush roller bodies 1 rotate in the opposite direction of the running direction of the strip steel 5. The magnitude of the pressing current on the surface of the strip steel 5 decreases step by step from both sides of the strip steel to the middle. The rotation speed of the brush roller body 1 is 600-900 rpm, thereby obtaining the sub-finished product of the strip steel 5.

[0049] By controlling the pressure current in different areas of the brush roller in stages, controlling the forward and reverse rotation of the brush roller, and controlling the upward and downward lifting of the strip, the descaling efficiency is improved, effectively solving the problem of difficult descaling of the edges of hot-rolled strip.

[0050] After descaling and polishing, strip steel 5 undergoes pickling and final cleaning to obtain the finished strip steel product; please refer to [link / reference]. Figure 5 The above-mentioned brush roller device and method are used to treat the surface of the strip steel, which produces good results.

[0051] Example 1

[0052] Taking a brush roller with an effective coverage area width of 1300mm as an example, within the effective width of the brush roller, the bristles from 0-200mm from the edge are made of 10-strand filaments (i.e., each bristle has 10 strands), with a relative bristle density of 100%; the bristles from 200-400mm from the edge are made of 8-strand filaments (i.e., each bristle has 8 strands), with a relative bristle density of 80%; and the bristles from 400mm from the edge to the center of the brush roller are made of 7-strand filaments (i.e., each bristle has 7 strands), with a relative bristle density of 70%.

[0053] The newly assembled brush rollers undergo a pre-treatment process before being put on the production line. The new brush rollers are placed on the motor and pressed against a steel plate. The motor's rotation power is set to 100KW for 3 minutes, then switched to 80KW for 3 minutes, and finally switched to 60KW for 4 minutes.

[0054] Hot-rolled stainless steel coils with a width of 1250mm and a thickness of 6.0mm are fed into the production line and, after annealing, descaling, and shot blasting, enter the brush rollers.

[0055] The first group of brush rollers pushes the strip upward by 200mm. The upper and lower brush rollers rotate along the direction of the strip movement. The brush rollers press the current of 300A in the area of 0-200mm from the edge, 200A in the area of 200-400mm from the edge, and 100A in the area of 400mm from the edge to the center. The rotating speed of the brush rollers is 900rpm.

[0056] The second group of brush rollers pushes the strip downward by 200mm. The upper and lower brush rollers rotate against the direction of the strip movement. The brush rollers press the current of 300A in the area of 0-200mm from the edge, 200A in the area of 200-400mm from the edge, and 100A in the area of 400mm from the edge to the center. The rotating speed of the brush rollers is 600rpm.

[0057] After the strip passes through the two groups of brush rollers, it enters the acid area and the final cleaning, and then is dried and wound. The product is offline.

[0058] Please refer to Figure 7 After the strip passes through the above treatment, the surface roughness effect of the hot-rolled black roll processed by the brush roller device and method of Example 1 is compared with that of the hot-rolled black roll not processed by the brush roller device and method of the application. The surface roughness of the untreated hot-rolled black roll is uneven, and the roughness on both sides is obviously higher than that in the center. However, the surface roughness of the annealed and pickled white roll of Example 1 is uniform.

[0059] Example 2

[0060] Taking a brush roller with an effective coverage area width of 1300mm as an example, the brush roller uses 10 strands of silk to wind the bristles in the area of 0-200mm from the edge within the effective width (i.e. each bristle has 10 strands of silk), and the relative density of the bristles is 100%; the brush roller uses 8 strands of silk to wind the bristles in the area of 200-400mm from the edge (i.e. each bristle has 8 strands of silk), and the relative density of the bristles is 80%; and the brush roller uses 7 strands of silk to wind the bristles in the area of 400mm from the edge to the center of the brush roller (i.e. each bristle has 7 strands of silk), and the relative density of the bristles is 70%.

[0061] The newly assembled brush roller is pre-processed before entering the production line. The new brush roller is placed on the motor, and the new roller is pressed on a steel plate. The rotating power of the motor is set to 100KW for 3 minutes, then the power of the motor is switched to 80KW for 3 minutes, and finally the power of the motor is switched to 60KW for 4 minutes.

[0062] A hot-rolled stainless steel coil with a width of 1250mm and a thickness of 6.0mm is put into the production line for operation. After annealing, phosphorus breaking, and shot blasting, it enters the brush roller.

[0063] The first group of brush rollers pushes the strip upward by 200mm. The upper and lower brush rollers rotate along the direction of the strip movement. The brush rollers press the current of 325A in the area of 0-200mm from the edge, 225A in the area of 200-400mm from the edge, and 125A in the area of 400mm from the edge to the center. The rotating speed of the brush rollers is 1100rpm.

[0064] The second group of brush rollers pushes the strip downward by 200mm. The upper and lower brush rollers rotate against the direction of the strip movement. The brush rollers press the current of 325A in the area of 0-200mm from the edge, 225A in the area of 200-400mm from the edge, and 125A in the area of 400mm from the edge to the center. The rotating speed of the brush rollers is 800rpm.

[0065] After the strip passes through the two groups of brush rollers, it enters the acid area and the final cleaning, and then is dried and wound. The product is offline.

[0066] Please refer to Figure 8 After the strip is treated as above, the surface roughness of the hot-rolled black roll treated by the method of Example 2 is compared with that of the hot-rolled black roll not treated by the brush roller device and method of the application. The surface roughness of the untreated hot-rolled black roll is uneven, and the roughness on both sides is obviously higher than that in the center. However, the surface roughness of the annealed and pickled white roll of Example 2 is uniform.

[0067] Example 3

[0068] Taking a brush roller with an effective coverage area width of 1300mm as an example, the brush roller uses 10 strands of silk to wind the bristles in the area of 0-200mm from the edge (i.e. each bristle has 10 strands of silk), and the relative density of the bristles is 100%; the brush roller uses 8 strands of silk to wind the bristles in the area of 200-400mm from the edge (i.e. each bristle has 8 strands of silk), and the relative density of the bristles is 80%; and the brush roller uses 7 strands of silk to wind the bristles in the area of 400mm from the edge to the center of the brush roller (i.e. each bristle has 7 strands of silk), and the relative density of the bristles is 70%.

[0069] The newly assembled brush roller is pre-treated before being put into production. The new brush roller is placed on the motor, and the new roller is pressed on a steel plate. The rotating power of the motor is set to 100KW for 3 minutes, then the power of the motor is switched to 80KW for 3 minutes, and finally the power of the motor is switched to 60KW for 4 minutes.

[0070] A hot-rolled stainless steel roll with a width of 1250mm and a thickness of 6.0mm is put into the production line for operation. After annealing, phosphorus breaking, and shot blasting, it enters the brush roller.

[0071] The first group of brush rollers lift the strip steel upward by 200mm, the upper and lower brush rollers rotate along the direction of strip steel running, the brush rollers press current of 350A in the area of 0-200mm away from the edge, 250A in the area of 200-400mm away from the edge, 150A in the area of 400mm away from the edge to the center, and the rotating speed of the brush rollers is 1200rpm.

[0072] The second group of brush rollers lift the strip steel downward by 200mm, the upper and lower brush rollers rotate against the direction of strip steel running, the brush rollers press current of 350A in the area of 0-200mm away from the edge, 250A in the area of 200-400mm away from the edge, 150A in the area of 400mm away from the edge to the center, and the rotating speed of the brush rollers is 900rpm.

[0073] After the strip steel passes through the two groups of brush rollers, it enters the acid area and the final cleaning, and then is dried and wound, and the product is offline.

[0074] Please refer to Figure 9 After the strip steel passes through the above treatment, the surface roughness effect of the hot-rolled black coil treated by the brush roller device and method of example 3 without using the brush roller device and method of the application is compared, the surface roughness of the untreated hot-rolled black coil is uneven, and the roughness on both sides is obviously higher than that in the center; and using the method of the application, the surface roughness of the annealed and pickled white coil of example 3 is uniform.

[0075] Through the above three examples, it can be seen that compared with the brush roller device and method in the application, the strip steel surface has the following effects

[0076] In the application, the brush hardness and relative density of the brush are changed correspondingly for different areas, which effectively solves the problem of uneven surface roughness of the strip steel;

[0077] In the application, the pressing current of the brush roller in different areas is controlled in stages, the brush roller is controlled to rotate forward and reverse, and the strip steel is lifted upward and downward, which improves the phosphorus removal efficiency and effectively solves the problem of difficult phosphorus removal of the hot-rolled strip steel edge.

[0078] In the application, the infrared temperature sensor is arranged on the spraying unit, which can detect the actual temperature of the brush, and can control the working temperature of the brush through external water spraying, the water amount of spraying is dynamically adjusted according to the actual temperature of the brush, the working temperature of the brush is stabilized within 50℃, the strength of the brush is ensured, and the effect of stable phosphorus removal is achieved;

[0079] In the application, the brush detection unit can detect the length of the brush, and automatically alarms when the length of the brush is ≤20mm, so as to prevent mechanical scratches caused by the contact between the brush roller core and the surface of the strip steel when the brush is used up;

[0080] In the application, the new brush roller is pretreated to prevent the problem of brush roller marks caused by the hard brush of the new brush roller.

[0081] It has to be noted that, in the present document, the terms "first", "second", etc. merely serve to identify a subject or action, without necessarily requiring or implying any actual such relationship or order between such subjects or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the presence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0082] While embodiments of the application have been shown and described, it is to be understood that the application is not limited to the details of the embodiments described, since numerous further modifications and changes can be apparent to one skilled in the art without departing from the spirit and scope of the application, which is defined by the appended claims and their equivalents.

Claims

1. A brush roll device for descaling and polishing of hot rolled strip characterized in that: The application relates to a brush roller device for removing phosphor and polishing a strip steel, which comprises a brush roller body (1), brush hairs (2), a spraying unit (3) and a brush hair detection unit (4); the brush hairs (2) are covered on the brush roller body (1); the brush hair hardness of the brush hairs (2) gradually decreases from both ends to the middle of the brush roller body (1), and the brush hair relative density gradually decreases from both ends to the middle of the brush roller body (1); the spraying unit (3) is installed on the outer side of the brush roller body (1), and a spraying port is close to and directionally aligned with the brush roller body (1); the brush hair detection unit (4) is installed on both ends of the brush roller body (1).

2. A brush roll device for dephosphorization and polishing of hot rolled strip steel as claimed in claim 1, wherein: An infrared temperature sensor is arranged on the spraying unit (3), and the infrared temperature sensor monitors and records the temperature of the brush hairs (2).

3. A brush roll device for dephosphorization and polishing of hot rolled strip steel as claimed in claim 1 wherein: The brush hair detection unit (4) records the length position value of the brush hairs (2); and the change amount of the length position value of the brush hairs (2) is the loss value of the brush hairs (2).

4. A brush roll device for dephosphorization and polishing of hot rolled strip steel as claimed in claim 1 wherein: An alarm is arranged on the brush hair detection unit (4), and the alarm automatically alarms when the length of the brush hairs (2) is less than or equal to 20 mm.

5. A method of producing a strip steel using the brush roll device according to any one of claims 1 to 4, characterized in that: The method comprises the following steps: New brush roller pretreatment: a new brush roller body (1) is placed on a motor, the new brush roller is pressed on a steel plate, 60KW-100KW motor rotating power is set, and the new brush roller is finally loaded into a production line after a period of operation; The strip steel is subjected to phosphor removal and polishing treatment: the brush roller device is divided into two groups, and each group has one brush roller body (1) above and below the strip steel (5); First group of brush roller device: the upper and lower brush roller bodies (1) lift the strip steel (5) upwards, the two brush roller bodies (1) rotate along the running direction of the strip steel (5), the size of the pressing current on the surface of the strip steel (5) gradually decreases from both sides to the middle of the strip steel, and the rotating speed of the brush roller body (1) is 900-1200 rpm; Second group of brush roller device: the upper and lower brush roller bodies (1) lift the strip steel (5) downwards, the two brush roller bodies (1) rotate against the running direction of the strip steel (5), the size of the pressing current on the surface of the strip steel (5) gradually decreases from both sides to the middle of the strip steel, and the rotating speed of the brush roller body (1) is 600-900 rpm, so that the semi-finished product of the strip steel (5) is obtained.

6. The method of claim 5, wherein: The strip steel (5) needs to be subjected to annealing, phosphor breaking and shot blasting pretreatment before being subjected to phosphor removal and polishing treatment.

7. The method of claim 5, wherein: After the strip steel (5) is subjected to phosphor removal and polishing treatment, the strip steel (5) is subjected to pickling, final cleaning and drying and winding, so that the finished product of the strip steel (5) is obtained.

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