A method for grinding steel strip

Abstract

This invention discloses a method for grinding steel strip, comprising the following steps: S1 arranging brush rollers, S2 forming a production line, S3 raising and lowering the brush rollers, S4 holding the steel strip, and S5 grinding the steel strip. The method involves placing a first brush roller and a second brush roller in the same unit at different heights. After assembling multiple grinding units into a production line and placing the steel strip on it, the two brush rollers are positioned above and below the steel strip, respectively. The two brush rollers are driven to adhere to the upper and lower surfaces of the steel strip, respectively. A support roller group and a pressure roller group then keep the steel strip stable. Finally, the upper and lower surfaces of the steel strip are simultaneously ground, eliminating the problems of unstable operation and poor cleaning effect associated with sequential grinding on one side. Furthermore, after retraction, secondary processing of both surfaces can be directly performed.

Description

Technical Field

[0001] This invention relates to the field of furniture, and in particular to a method for grinding steel strips. Background Technology

[0002] It often takes a period of time for strip steel to go from production to actual use. During this period, due to the inherent properties of the strip steel, the surface of the strip steel may rust, affecting its actual use. Therefore, the rusted strip steel needs to be derusted before it is processed into technical products.

[0003] Currently, a commonly used physical rust removal method involves using brush rollers to grind and remove rust from the strip steel surface. Existing brush roller rust removal methods often involve sequentially brushing the upper and lower surfaces of the strip; that is, first using a brush roller on the upper surface to brush the upper surface, and then using a brush roller on the lower surface to brush the lower surface. While relatively simple, this method has several problems: 1. When brushing a single surface of a strip steel, the force exerted by the brush roller on the strip steel is uneven. Even with the use of support rollers and pressure rollers for auxiliary stabilization, the strip steel is still prone to shaking, which leads to instability in the entire working process, reduces efficiency and cleaning effect. 2. The existing method is to brush one side of the strip steel with a brush roller before brushing the other side. When brushing one side and then brushing the other side, the side that has already been brushed is easily contaminated when brushing the other surface, which affects the cleaning effect. Moreover, if contamination is found, it is necessary to retreat a long distance before cleaning the surface, which is too troublesome for secondary processing. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a method for grinding steel strip. A first brush roller and a second brush roller are placed in the same unit at different heights. After assembling multiple grinding units into a production line and placing the steel strip on it, the two brush rollers are positioned above and below the steel strip, respectively. The two brush rollers are driven to adhere to the upper and lower surfaces of the steel strip, respectively. A support roller group and a pressure roller group then keep the steel strip stable. Finally, the upper and lower surfaces of the steel strip are simultaneously ground. This method eliminates the instability and poor cleaning effect associated with sequential grinding on one side. Furthermore, after retraction, secondary processing of both surfaces can be directly performed.

[0005] The technical solution of this invention is implemented as follows: A method for grinding steel strips includes: S1. Arrange the brush rollers: Simultaneously set the first brush roller and the second brush roller distributed in front and behind in the frame of the brush unit, and control the lifting mechanism to drive the first brush roller and the second brush roller to rise and fall and make the first brush roller and the second brush roller at different heights. S2. Forming a production line: Multiple brush units are arranged sequentially from front to back to form a production line, and strip steel is conveyed from front to back on the production line. The strip steel is supported by a group of idler rollers set on the frame and pressed down by a group of pressure rollers set on the frame. S3, Brush Roller Lifting: The first brush roller and the second brush roller are positioned on the upper and lower sides of the strip. The lifting mechanism is controlled again to move the first brush roller and the second brush roller closer to the strip and make the first brush roller and the second brush roller abut against the upper and lower surfaces of the strip respectively. S4. Holding the strip: The movable roller in the roller group is driven by the drive unit to approach the strip from bottom to top and support the strip. At the same time, the movable pressure roller in the pressure roller group is driven to approach the strip from top to bottom and press down on the strip to keep the strip in a straight state. S5. Grinding and brushing the strip: While conveying the strip, start the first brush roller and the second brush roller, and the first brush roller and the second brush roller respectively brush the upper surface and the lower surface of the strip.

[0006] This method integrates first and second brush rollers at different heights into a single brushing unit, allowing the upper and lower surfaces of the strip to be brushed simultaneously. Corresponding to the brush rollers at different positions, movable rollers at different positions are used to maintain the strip's straightness and stability. Specifically, the movable roller is positioned next to the brush roller above the strip, and the movable roller is positioned next to the brush roller below the strip. This solves the problems of unstable operation and poor cleaning effect associated with sequential brushing on one side, and allows for secondary processing of both surfaces directly after retraction.

[0007] Preferably, in step S1, the frame includes a first working space and a second working space arranged adjacent to each other. The first brush roller is located in the first working space, and the second brush roller is located in the second working space, with the height of the first brush roller being lower than the height of the second brush roller. The lower height of the first brush roller means that the first brush roller is located below the strip and brushes the lower surface of the strip, while the second brush roller is located above the strip and brushes the upper surface of the strip.

[0008] Preferably, in step S2, the second working space of the preceding brushing unit is adjacent to the first working space of the following brushing unit. The first working space and the second working space alternate sequentially so that the strip undergoes the same brushing operation in each brushing unit, and each position of the strip is similarly stable.

[0009] Preferably, in step S3, the first brush roller and the second brush roller are driven to rotate and approach the strip. When the current driving the first brush roller and the second brush roller to rotate increases, the movement and rotation of the first brush roller and the second brush roller are stopped. At this time, the first brush roller, the second brush roller and the strip are in contact.

[0010] Preferably, in step S4, the movable idler in the idler roller group is located beside the first brush roller, and the fixed pressure roller in the pressure roller group is above the first brush roller. Before the movable idler approaches the strip from bottom to top, the vertical distance between the movable idler and the fixed pressure roller is greater than the strip thickness. After the movable idler approaches the strip from bottom to top, the vertical distance between the movable idler and the fixed pressure roller is equal to the strip thickness. For the movable idler, the distance between the movable idler and the fixed pressure roller can be adjusted according to the strip thickness by raising and lowering, thereby accommodating strips of different thicknesses.

[0011] As a preferred option, step S6, inspection and secondary treatment, is also included: After step S5, the strip steel moving outward from the production line is visually inspected. If an oxide layer is still present on the upper or lower surface of the strip steel, the strip steel is moved in the reverse direction for secondary brushing. Although simultaneous brushing on both sides is less likely to cause contamination, there may still be cases where the strip steel is not completely cleaned. Therefore, once contamination is detected, the strip steel can be directly returned to one brushing unit for secondary cleaning on both sides, which is more convenient and faster.

[0012] Preferably, in step S4, the idler roller group further includes a swing idler roller, which is disposed below the second brush roller and swings relative to the thickness of the strip. The swing idler roller is adjacent to both the fixed pressure roller and the movable pressure roller. For the fixed pressure roller, the swing idler roller provides a range of motion between them to accommodate different strip thicknesses.

[0013] Preferably, the oscillating roller is mounted on an oscillating seat, which is rotatably mounted on the frame and is provided with elasticity and driven rotation by a gas spring.

[0014] The design starting point, concept, and beneficial effects of the present invention, which adopts the above technical solution, are as follows: This method utilizes the concept of simultaneously brushing both the upper and lower surfaces of the strip within a single unit. By integrating the first and second brush rollers at different heights into a single brushing unit, the upper and lower surfaces of the strip can be brushed simultaneously. Corresponding to the brush rollers at different positions, movable rollers at different positions are used to maintain the strip's straightness and stability. Specifically, the pressure roller beside the brush roller located above the strip is the aforementioned movable pressure roller; the support roller beside the brush roller located below the strip is the aforementioned movable support roller. This solves the problems of unstable operation and poor cleaning effect associated with sequential brushing on one side, and allows for secondary treatment of both surfaces directly after retraction. The main benefits achieved are prevention of secondary contamination of the strip, more stable operation, and higher brushing efficiency. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the brush unit in an embodiment of the present invention. Figure 1 ; Figure 2This is a three-dimensional structural diagram of the arrangement of the first, second, and third columns in an embodiment of the present invention; Figure 3 This is a three-dimensional structural diagram of the brush unit in an embodiment of the present invention. Figure 2 ; Figure 4 This is a three-dimensional structural diagram of the brush unit in an embodiment of the present invention. Figure 3 ; Figure 5 This is a three-dimensional structural diagram of the swing seat mounted on the frame in an embodiment of the present invention; Figure 6 This is a cross-sectional view of the brush unit in an embodiment of the present invention; Figure 7 This is a three-dimensional structural diagram of the swing seat in an embodiment of the present invention. Figure 1 ; Figure 8 This is a three-dimensional structural diagram of the swing seat in an embodiment of the present invention. Figure 2 ; Figure 9 This is a side view of the swing seat in an embodiment of the present invention; Figure 10 This is a front view of the swing seat in an embodiment of the present invention; Figure 11 This is a side view of the brush unit in an embodiment of the present invention; Figure 12 This is a front view of the brush unit in an embodiment of the present invention; Figure 13 This is a three-dimensional structural diagram of the production line in an embodiment of the present invention; Figure 14 This is a front view of the production line in an embodiment of the present invention; Figure 15 This is a flowchart illustrating the method of the present invention in an embodiment.

[0016] The reference numerals in the attached drawings are as follows: 100 brush unit; 200 strip steel; 1 frame; 1a first working position; 1b second working position; 2 lower brush roller; 3 upper brush roller; 4 lifting mechanism; 41 lifting drive motor; 42 lifting guide rod; 5 first column; 6 second column; 7 third column; 8 top seat; 9 transverse movement mechanism; 91 slide rail; 92 moving seat; 93 transverse movement drive motor; 10 brush roller seat; 11 extension column; 12 upper support roller; 13 lower support roller. 13; Upper pressure roller; 14; Lower pressure roller; 15; First upper crossbeam; 16; First lower crossbeam; 17; Second upper crossbeam; 18; Second lower crossbeam; 19; Lifting seat; 20; Guide column; 21; Cylinder; 22; Pressure roller seat; 23; Third upper crossbeam; 24; Third lower crossbeam; 25; Support seat; 26; Swing seat; 27; Shaft seat; 28; Rotating shaft; 29; Gas spring; 30; Limit seat; 31; Limit rod; 32; Limit plate; 33; Base; 34; Drainage channel; 35. Implementation

[0017] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0018] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0019] In the description of this invention, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] The specific embodiments of the present invention are as follows: like Figure 15 As shown, the present invention provides a method for grinding a steel strip, the steps of which include: S1. Arrange the brush rollers: Simultaneously set the first brush roller and the second brush roller distributed in front and behind in the frame of the brush unit, and control the lifting mechanism to drive the first brush roller and the second brush roller to rise and fall and make the first brush roller and the second brush roller at different heights. S2. Forming a production line: Multiple brush units are arranged sequentially from front to back to form a production line, and strip steel is conveyed from front to back on the production line. The strip steel is supported by a group of idler rollers set on the frame and pressed down by a group of pressure rollers set on the frame. S3, Brush Roller Lifting: The first brush roller and the second brush roller are positioned on the upper and lower sides of the strip. The lifting mechanism is controlled again to move the first brush roller and the second brush roller closer to the strip and make the first brush roller and the second brush roller abut against the upper and lower surfaces of the strip respectively. S4. Holding the strip: The movable roller in the roller group is driven by the drive unit to approach the strip from bottom to top and support the strip. At the same time, the movable pressure roller in the pressure roller group is driven to approach the strip from top to bottom and press down on the strip to keep the strip in a straight state. S5. Grinding and brushing the strip: While conveying the strip, start the first brush roller and the second brush roller, and the first brush roller and the second brush roller respectively brush the upper surface and the lower surface of the strip.

[0021] In this embodiment, the first brush roller is the lower brush roller 2, the second brush roller is the upper brush roller 3, the movable support roller is the lower support roller 13, and the movable pressure roller is the upper pressure roller 14. This method is applied to an assembly line consisting of brush units made of steel strips, such as... Figure 1 , 3 As shown in Figure 6, the brush unit includes: The frame 1 is configured as the main support for the brush unit 100; the frame 1 includes a first working position 1a and a second working position 1b arranged adjacent to each other. The lower brush roller 2 is set at the first working position 1a of the frame 1. The lower brush roller 2 is configured to be located below the strip 200 and to brush the lower surface of the strip 200. The upper brush roller 3 is set at the second working position 1b of the frame 1. The upper brush roller 3 is configured to be located above the strip 200 and to brush the upper surface of the strip 200. The lower brush roller 2 and the upper brush roller 3 are integrated together on the frame 1. The lower brush roller 2 and the upper brush roller 3 are both connected to a lifting mechanism 4. The lifting mechanism 4 is set on the frame 1 and configured to drive the lower brush roller 2 or the upper brush roller 3 to move up and down. The idler roller assembly is set on the frame 1 and located below the strip 200. The idler roller assembly is configured to support the strip 200 upwards. The pressure roller assembly is mounted on the frame 1 and located above the strip 200. The pressure roller assembly is configured to press downwards onto the strip 200. The strip steel 200 passes through the frame 1 from front to back and passes through the first working position 1a and the second working position 1b in sequence. The lower brush roller 2, the upper brush roller 3, the support roller group and the pressure roller group keep the strip steel 200 at a horizontal plane, and the lower brush roller 2 and the upper brush roller 3 respectively brush the lower surface and the upper surface of the strip steel 200.

[0022] The upper brush roller 3 and the lower brush roller 2 are integrated into one unit. The upper brush roller 3 and the lower brush roller 2 simultaneously brush the upper and lower surfaces of the strip steel 200. The simultaneous brushing of the two surfaces of the strip steel 200 by the upper brush roller 3 and the lower brush roller 2 counteracts the force, making the strip steel 200 more stable during operation, the brush rollers clean more thoroughly, and the efficiency is higher. At the same time, it can also reduce vibration and noise. The lifting mechanism 4 provides lifting capability for the upper brush roller 3 and the lower brush roller 2, so that the upper brush roller 3 and the lower brush roller 2 can make just contact with the surface of the strip steel 200 without excessive contact affecting the working stability, and can adapt to strip steel 200 of different thicknesses. The idler roller group and the pressure roller group can further maintain the straightness of the strip steel 200, making the operation more stable.

[0023] like Figure 1-5As shown, the frame 1 is a frame structure. The frame 1 includes a first column 5, a second column 6, and a third column 7, which are arranged sequentially from front to back. Each column has two members, one on the left and one on the right. The first working position 1a is located between the first column 5 and the second column 6, and the second working position 1b is located between the second column 6 and the third column 7. The top of the first column 5 and the second column 6 are provided with a top seat 8, and the top of the second column 6 and the third column 7 are also provided with a top seat 8. The top seat 8 is a hollow rectangular frame structure. Both top seats 8 are provided with a transverse movement mechanism 9. The transverse movement mechanism 9 includes a slide rail 91 and a moving seat 92. The slide rail 91 is arranged on the front and rear sides of the hollow part of the top seat 8. The moving seat 92 is slidably mounted on the slide rail 91 and is driven by a transverse movement drive motor 93 to move the moving seat 92 in the left and right direction on the slide rail 91. The transverse movement drive motor 93 is mounted on the top seat 8 and is located next to the moving seat 92.

[0024] Both movable seats 92 are equipped with the lifting mechanism 4. The lifting mechanism 4 includes a lifting drive motor 41 and lifting guide rods 42. There are four lifting guide rods 42, all of which are inserted into the movable seats 92 and pass through the hollow of the top seat 8 to reach the first working position 1a or the second working position 1b. The lifting drive motor 41 is mounted on the movable seats 92 and drives the lifting guide rods 42 to rise and fall. The lower end of the lifting guide rod 42 is connected to a brush roller seat 10. The upper brush roller 3 and the lower brush roller 2 are respectively mounted on the two brush roller seats 10. Under the action of the lifting mechanism 4, the upper brush roller 3 and the lower brush roller 2 can be at different heights, that is, the upper brush roller 3 can be above the strip 200 and the lower brush roller 2 can be below the strip 200. The transverse mechanism 9 can drive the lifting mechanism 4, the brush roller seat 10, and the upper brush roller 3 and the lower brush roller 2 to move in the left and right directions. The purpose of doing this is because the length of the upper brush roller 3 and the lower brush roller 2 is generally greater than the width of the strip 200. The ends of the brush rollers exceed the strip 200 and cannot work. Moving the brush rollers left and right can make the brush rollers wear evenly and avoid waste.

[0025] The lengths of the columns are different to accommodate the different heights of the upper brush roller 3 and the lower brush roller 2. Specifically, the first column 5 and the second column 6 are of equal length, and the third column 7 is longer than the second column 6. That is, the third column 7 is longer than the second column 6, and its height is also higher than the first column 5 and the second column 6. In order to keep the top seat 8 on the second column 6 and the third column 7 horizontal, an extension column 11 is also provided on the second column 6. Ultimately, the space above the strip 200 in the second working position 1b is larger, which is conducive to the lifting and lowering of the upper brush roller 3.

[0026] like Figure 6 , 11As shown in Figures 1 and 12, the idler roller group includes an upper idler roller 12 and a lower idler roller 13, and the pressure roller group also includes an upper pressure roller 14 and a lower pressure roller 15. The lower idler roller 13 and the lower pressure roller 15 are located in the first working position 1a and cooperate with the lower brush roller 2 to maintain the straightness and stability of the strip 200. The upper idler roller 12 and the upper pressure roller 14 are located in the second working position 1b and cooperate with the upper brush roller 3 to maintain the straightness and stability of the strip 200. The lower pressure rollers 15 are all fixed on the frame 1, and the lower idler rollers 13 are movably mounted on the frame 1. Specifically, a first upper crossbeam 16 and a first lower crossbeam 17 are provided between the two first columns 5, and two second columns 5 are provided between the first columns 5. A second upper crossbeam 18 and a second lower crossbeam 19 are provided between the columns 6. There are two upper rollers 12, which are respectively set on the first lower crossbeam 17 and the second lower crossbeam 19. A lifting seat 20 is provided between the upper rollers 12 and the first lower crossbeam 17 or the second lower crossbeam 19. Two guide columns 21 are provided below the lifting seat 20. The guide columns 21 are inserted on the first lower crossbeam 17 and the second lower crossbeam 19. A cylinder 22 is provided on the first upper crossbeam 16 and the second upper crossbeam 18. The cylinder 22 is connected downward to the lifting seat 20 and drives the lifting seat 20 and the lower roller 13 on the lifting seat 20 to rise and fall.

[0027] The first upper crossbeam 16 and the second upper crossbeam 18 are also provided with pressure roller seats 23. The two pressure roller seats 23 are arranged opposite each other and extend towards the first working position 1a. There are four lower pressure rollers 15, which are respectively arranged on the first upper crossbeam 16, the second upper crossbeam 18 and the two pressure roller seats 23. The lower brush roller 2 is located directly below the lower pressure rollers 15 on the two pressure roller seats 23, and the axis of the lower brush roller 2 is located at the center line of the two lower pressure rollers 15. That is, the two pressure rollers on the pressure roller seats 23 and the lower brush roller 2 can pass through each other. To maintain the straightness and stability of the strip 200 at this position, the lower brush roller 2 acts as a support roller while working; the lower pressure roller 15 set on the first upper crossbeam 16 and the lower support roller 13 set on the first lower crossbeam 17 can maintain the straightness and stability of the strip 200 located at the first column 5. Similarly, the lower pressure roller 15 set on the second upper crossbeam 18 and the lower support roller 13 set on the second lower crossbeam 19 can maintain the straightness and stability of the strip 200 located at the second column 6.

[0028] A third upper crossbeam 24 and a third lower crossbeam 25 are provided between the two third columns 7. The upper pressure roller 14 is located below the third upper crossbeam 24. Another lifting seat 20 is provided between the third upper crossbeam 24 and the upper pressure roller 14. Another cylinder 22 is also provided on the third upper crossbeam 24. The cylinder 22 is connected to the lifting seat 20 and drives the lifting table and the upper pressure roller 14 to rise and fall.

[0029] like Figure 5-10As shown, a support seat 26 is provided on the second lower crossbeam 19 of the second column 6, and the support seat 26 is positioned facing the third lower crossbeam 25. A swing seat 27 is provided on the third lower crossbeam 25 and the support seat 26, and the swing seat 27 spans across the third lower crossbeam 25 and the support seat 26. The upper roller 12 is disposed on the swing seat 27. Specifically, two bearing seats 28 are provided on the third lower crossbeam 25 at left and right intervals, and a rotating shaft 29 arranged in the left and right direction is provided between the bearing seats 28. The rotating shaft 29 passes through the swing seat 27 and enables the swing seat 27 to rotate relative to the third lower crossbeam 25. There are two support seats 26, which are arranged on the second lower crossbeam 19 at left and right intervals. The support seats 26 rotate. A gas spring 30 is provided, which pushes the upper support roller 12 toward the strip 200. The gas spring 30 can control the swing seat 27 to rotate around the rotating shaft 29, and the upper support roller 12 on the swing seat 27 moves accordingly to adapt to the thickness of the strip 200. The gas spring 30 is elastic and can automatically adapt to the thickness of the strip 200. Since the lower pressure roller 15 in front of the upper support roller 12 is fixed, if the upper support roller 12 is also fixed, the thickness range of the strip 200 that the brush unit 100 can adapt to will be greatly reduced. However, after the upper support roller 12 is oscillated, it can adapt to the thickness variation on the same strip 200, and can also adapt to a larger thickness range of strip 200 by adjusting the length of the gas spring 30.

[0030] A limiting assembly is also provided between the two support groups. The limiting assembly includes a limiting seat 31 and a limiting rod 32. The limiting seat 31 is fixedly installed on the second lower crossbeam 19 and faces the third lower crossbeam 25. The limiting rod 32 is vertically installed on the limiting seat 31. A limiting plate 33 is correspondingly provided on the swing seat 27. The limiting plate 33 faces the limiting rod 32. The height distance between the limiting plate 33 and the limiting rod 32 is a variable range of the thickness of the strip 200, that is, it is suitable for the thickness range of the same strip 200. The limiting rod 32 is adjustablely set on the limiting seat 31 by a thread, so that the distance between the limiting plate 33 and the limiting rod 32 can be adjusted.

[0031] like Figure 13 , 14 As shown, a base 34 is also provided below the frame 1, and a drainage channel 35 is provided on the base 34. The drainage channel 35 is located below the frame 1 and is recessed downward on the surface of the base 34. The size of the drainage channel 35 is configured to allow workers to enter. Multiple brushing units 100 are arranged sequentially from front to back to form a production line, and the drainage channels 35 of the multiple brushing units 100 are connected. When the production line is working, that is, when brushing the surface of the strip steel 200, water spraying is required to cool it down and flush the brushed oxide layer into the drainage channel 35. Even if the oxide layer remains in the drainage channel 35, workers can still clean it easily and quickly.

Claims

1. A method for grinding steel strips, characterized in that, The steps are as follows: S1. Arrange the brush rollers: Simultaneously set the first brush roller and the second brush roller distributed in front and behind in the frame of the brush unit, and control the lifting mechanism to drive the first brush roller and the second brush roller to rise and fall and make the first brush roller and the second brush roller at different heights. S2. Forming a production line: Multiple brush units are arranged sequentially from front to back to form a production line, and strip steel is conveyed from front to back on the production line. The strip steel is supported by a group of idler rollers set on the frame and pressed down by a group of pressure rollers set on the frame. S3, Brush Roller Lifting: The first brush roller and the second brush roller are positioned on the upper and lower sides of the strip. The lifting mechanism is controlled again to move the first brush roller and the second brush roller closer to the strip and make the first brush roller and the second brush roller abut against the upper and lower surfaces of the strip respectively. S4. Holding the strip: The movable idler in the idler roller group is driven by the drive unit to approach the strip from bottom to top and support it. At the same time, the movable pressure roller in the pressure roller group is driven to approach the strip from top to bottom and press it down on the strip, keeping the strip in a straight state. In step S4, the idler roller group also includes a swing idler. The swing idler is set below the second brush roller and swings relative to the thickness of the strip. Several swing idlers are installed sequentially from front to back on a swing seat, and the swing seat is rotatably set on the frame. A gas spring is set on the frame and acts on the swing seat, providing elasticity and driving rotation. The elastic adjustment element is adjusted according to the thickness of the strip to adjust the rotation angle of the swing seat so that the swing idler is close to the strip. The rotation point of the swing seat is located below the movable pressure roller, and one of the swing idlers is located below the movable pressure roller. S5. Grinding and brushing the strip: While conveying the strip, start the first brush roller and the second brush roller, and the first brush roller and the second brush roller respectively brush the upper surface and the lower surface of the strip.

2. The method for grinding steel strips according to claim 1, characterized in that: In step S1, the frame includes a first working space and a second working space arranged adjacent to each other. The first brush roller is located in the first working space, the second brush roller is located in the second working space, and the height of the first brush roller is lower than the height of the second brush roller.

3. The method for grinding steel strips according to claim 2, characterized in that: In step S2, the second working space of the previous brush unit is adjacent to the first working space of the next brush unit.

4. The method for grinding steel strips according to claim 1, characterized in that: In step S3, the first brush roller and the second brush roller are driven to rotate and approach the strip. When the current driving the first brush roller and the second brush roller to rotate increases, the movement and rotation of the first brush roller and the second brush roller are stopped. At this time, the first brush roller, the second brush roller and the strip are in contact.

5. The method for grinding steel strips according to claim 1, characterized in that: In step S4, the movable idler in the idler group is located next to the first brush roller, and the fixed pressure roller in the pressure roller group is above the first brush roller; before the movable idler approaches the strip from bottom to top, the vertical distance between the movable idler and the fixed pressure roller is greater than the thickness of the strip; after the movable idler approaches the strip from bottom to top, the vertical distance between the movable idler and the fixed pressure roller is the thickness of the strip.

6. The method for grinding steel strips according to claim 1, characterized in that: It also includes step S6, inspection and secondary treatment: After step S5, the strip steel moving outward from the production line is visually inspected in a timely manner. If there is still an oxide layer on the upper or lower surface of the strip steel, the strip steel is moved in the opposite direction and a secondary brushing treatment is performed.

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