A steel strip plastic coating pretreatment device

Abstract

The utility model provides a kind of steel band plastic coating pretreatment device, belong to the field of processing technology of bellows, including cleaning box, be set on the travel path of steel band.The steel band passes through from cleaning box.Movable support, reciprocatingly move setting on cleaning box, and moving direction is perpendicular with the travel direction of steel band, with the band surface of steel band parallel.Two cleaning rollers, respectively rotation setting on movable support, the outer periphery of two cleaning rollers respectively with the upper and lower surface of steel band abut.Two first spray heads, fixedly set on cleaning box, and two water outlets respectively correspond to two cleaning rollers.Two cleaning brush plates, along the moving direction of movable support, interval arrangement is on cleaning box, and respectively located the two sides of steel band.In the process of reciprocatingly moving of movable support, two cleaning rollers are always in contact with steel band, two cleaning rollers are alternately in contact with two cleaning brush plates.The steel band plastic coating pretreatment device provided by the utility model makes cleaning roller always maintain good cleaning effect.

Description

Technical Field

[0001] This utility model belongs to the field of corrugated pipe processing technology, and more specifically, it relates to a steel strip plastic coating pretreatment device. Background Technology

[0002] Steel-reinforced polyethylene spiral corrugated pipe is a type of structural wall pipe made of metal and plastic through a spiral winding process. The pipe uses high-density polyethylene as the base material and high-strength steel strips spirally wound as reinforcement, combining the steel strips with the polyethylene plastic to achieve both the flexibility of plastic pipes and the rigidity of metal pipes.

[0003] In the manufacturing process of corrugated pipes, steel strip, as the base material, requires plastic coating. Plastic coating involves evenly applying a layer of adhesive resin to the surface of the steel strip, bonding it to the polyethylene and preventing peeling during use. However, because the steel strip has an oily protective layer during storage and transportation, while this effectively improves its corrosion resistance, it can affect the adhesion of the resin in the subsequent plastic coating process. Therefore, the surface of the steel strip must be cleaned before plastic coating.

[0004] Existing cleaning devices use cleaning rollers to brush the upper and lower surfaces of the steel strip. However, during operation, the cleaning rollers easily accumulate oil and dirt that has peeled off the surface of the steel strip. As the cleaning rollers run continuously, dirt accumulates on them, resulting in a decrease in the cleaning effect on the steel strip. Utility Model Content

[0005] The purpose of this invention is to provide a steel strip plastic coating pretreatment device, which aims to clean the cleaning roller and ensure the cleaning effect of the cleaning roller on the steel strip.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is: to provide a steel strip plastic coating pretreatment device, comprising:

[0007] A cleaning box is positioned on the path of the steel belt; the steel belt passes through the cleaning box.

[0008] A movable support is reciprocated on the cleaning box, and the direction of movement is perpendicular to the direction of travel of the steel strip and parallel to the surface of the steel strip.

[0009] Two cleaning rollers are rotatably mounted on the movable support, and the outer circumferential surfaces of the two cleaning rollers abut against the upper and lower surfaces of the steel strip, respectively.

[0010] Two first nozzles are fixedly mounted on the cleaning box, with their two outlets respectively facing the two cleaning rollers; and

[0011] Two cleaning brushes are arranged at intervals on the cleaning box along the moving direction of the movable bracket, and are respectively located on both sides of the steel belt;

[0012] During the reciprocating movement of the movable support, the two cleaning rollers are always in contact with the steel belt, and the two cleaning rollers alternately contact the two cleaning brushes.

[0013] In one possible implementation, the cleaning brush plate has inclined comb teeth on the side facing the cleaning roller;

[0014] When the cleaning roller comes into contact with the cleaning brush plate, the comb teeth extend into the bristles of the cleaning roller to clean the cleaning roller.

[0015] In one possible implementation, the linear velocity direction of the cleaning roller toward the cleaning brush plate is a first direction; the portion of the cleaning brush plate above the steel strip is a first part, and the portion of the cleaning brush plate below the steel strip is a second part; the comb teeth include:

[0016] Multiple first comb teeth are evenly distributed in the first part, and their inclination direction is opposite to the first direction of the cleaning roller located above the steel strip;

[0017] Multiple second comb teeth are evenly distributed in the second portion, and their inclination direction is opposite to the first direction of the cleaning roller located below the steel strip.

[0018] In one possible implementation, a slide rail is fixedly mounted on the cleaning box above the steel strip, and a slider is fixedly mounted on the top of the movable bracket, the slider being slidably connected to the slide rail.

[0019] In one possible implementation, a reciprocating screw is rotatably mounted on the slide rail, the axial direction of the reciprocating screw is the same as the moving direction of the movable bracket, and the reciprocating screw is threadedly connected to the slider.

[0020] A first motor is fixedly mounted on the slide rail, and the output end of the first motor is connected to the reciprocating lead screw.

[0021] In one possible implementation, the first nozzle, the cleaning roller, and the cleaning brush are arranged sequentially along the traveling direction of the steel strip. The cleaning brush is located in front of the water outlet of the first nozzle. When the cleaning roller moves to avoid any of the cleaning brushes, the first nozzle can directly spray the avoided cleaning brush.

[0022] In one possible implementation, the cleaning box is provided with a first steering roller, a second steering roller, a third steering roller and a fourth steering roller rotatably arranged in sequence along the traveling direction of the steel strip, and the steel strip is wound around the first steering roller, the second steering roller, the third steering roller and the fourth steering roller;

[0023] The first steering roller and the fourth steering roller are at a first height, and the second steering roller and the third steering roller are at a second height, with the first height being higher than the second height.

[0024] In one possible implementation, the first nozzle, the cleaning roller, and the cleaning brush are located between the second steering roller and the third steering roller.

[0025] In one possible implementation, two second nozzles are fixedly installed on the cleaning box, with the outlets of the two second nozzles facing the upper and lower sides of the steel strip respectively.

[0026] The two second nozzles are located between the third and fourth steering rollers.

[0027] In one possible implementation, two second motors are fixedly mounted on the movable support, each second motor corresponding to one of the cleaning rollers, and the output end of each second motor is connected to the corresponding cleaning roller.

[0028] The two cleaning rollers rotate in the opposite direction to the direction of travel of the steel strip.

[0029] This utility model provides a steel strip pretreatment device for plastic coating. Compared with the prior art, its advantages are as follows: When the steel strip moves, the cleaning roller cleans the upper and lower surfaces of the steel strip through its own rotation, removing impurities such as the oily protective layer from the surface of the steel strip, thus preparing it for subsequent plastic coating treatment. During the cleaning process of the cleaning roller, the first nozzle can spray water or cleaning fluid onto the cleaning roller to perform preliminary rinsing on the surface of the cleaning roller, washing away some of the attached dirt.

[0030] Meanwhile, during the reciprocating movement of the moving support, when the cleaning roller reaches contact with the cleaning brush plate, the cleaning brush plate will scrub the cleaning roller, further removing the residual dirt on the cleaning roller. Through the rinsing of the first nozzle and the scrubbing of the cleaning brush plate, the continuous accumulation of dirt on the cleaning roller is effectively avoided, ensuring that the cleaning roller always maintains a good cleaning effect, thereby ensuring that the steel strip can be continuously and efficiently cleaned. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 A cross-sectional view of the cleaning box of the steel strip plastic coating pretreatment device provided in this embodiment of the utility model;

[0033] Figure 2 An overall sectional view of the steel strip plastic coating pretreatment device provided in this embodiment of the utility model;

[0034] Figure 3 for Figure 2 A magnified structural diagram of part A in the middle;

[0035] Figure 4 for Figure 2 A magnified structural diagram of part B.

[0036] In the diagram: 1. Cleaning box; 2. Steel belt; 3. Moving bracket; 31. Slider; 32. Second motor; 4. Cleaning roller; 51. First nozzle; 52. Second nozzle; 6. Cleaning brush; 61. Comb teeth; 611. First comb teeth; 612. Second comb teeth; 71. Slide rail; 72. Reciprocating screw; 73. First motor; 81. First steering roller; 82. Second steering roller; 83. Third steering roller; 84. Fourth steering roller. Detailed Implementation

[0037] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0038] Please see Figure 1 , Figure 2 and Figure 3 The present invention provides a steel strip plastic coating pretreatment device. The steel strip plastic coating pretreatment device includes a cleaning box 1, a movable support 3, two cleaning rollers 4, two first nozzles 51, and two cleaning brushes 6.

[0039] Please see below. Figure 1 , Figure 2 and Figure 3The cleaning box 1 is positioned on the travel path of the steel belt 2. The steel belt 2 passes through the cleaning box 1. The movable support 3 is reciprocatingly mounted on the cleaning box 1, with its movement direction perpendicular to the travel direction of the steel belt 2 and parallel to the surface of the steel belt 2. Two cleaning rollers 4 are rotatably mounted on the movable support 3, with their outer circumferential surfaces abutting against the upper and lower surfaces of the steel belt 2, respectively. Two first nozzles 51 are fixedly mounted on the cleaning box 1, with their two outlets facing the two cleaning rollers 4, respectively. Two cleaning brushes 6 are spaced apart on the cleaning box 1 along the movement direction of the movable support 3, and are located on both sides of the steel belt 2, respectively.

[0040] During the reciprocating movement of the movable support 3, the two cleaning rollers 4 are always in contact with the steel belt 2, and the two cleaning rollers 4 alternately contact the two cleaning brushes 6.

[0041] It should be noted that the reciprocating movement of the movable bracket 3 is greater than the width of the steel belt 2, so as to ensure that the part of the cleaning roller 4 that is in contact with the steel belt 2 can be moved to be cleaned by the cleaning brushes 6 on both sides.

[0042] As the steel strip 2 is pulled along the production line by the traction machine, the cleaning rollers 4 located on the upper and lower sides of the steel strip 2 rotate to rub and clean the upper and lower surfaces of the steel strip 2, thereby removing oil and other impurities adhering to the surface of the steel strip 2. Simultaneously, the moving bracket 3 reciprocates on the cleaning box 1. During this reciprocating movement, the contact position between the cleaning roller 4 and the steel strip 2 changes, causing the cleaning roller 4 to move from the cleaned outer circumference of the steel strip 2 to contact the cleaning brush plate 6. At this time, the rotation of the cleaning roller 4 generates friction with the cleaning brush plate 6, thereby cleaning the cleaning roller 4 and reducing the accumulation of dirt on the cleaning roller 4.

[0043] In addition, the first nozzle 51 sprays water or cleaning fluid onto the cleaning roller 4 for rinsing, which can improve the cleaning effect of the cleaning roller 4 on the steel strip 2, and also play a certain cleaning role on the cleaning roller 4 itself.

[0044] In some embodiments, see Figure 3 The cleaning brush plate 6 has inclined comb teeth 61 on the side facing the cleaning roller 4. When the cleaning roller 4 comes into contact with the cleaning brush plate 6, the comb teeth 61 extend into the bristles of the cleaning roller 4 to clean the cleaning roller 4.

[0045] The comb teeth 61 on one side of the cleaning brush plate 6 are inclined. When the cleaning roller 4 contacts the cleaning brush plate 6, the comb teeth 61 can extend into the bristles of the cleaning roller 4. When dirt adheres to the bristles on the surface of the cleaning roller 4, the comb teeth 61 penetrate deep into it by means of the inclined angle, hooking out or loosening the dirt. Combined with the rinsing of the first nozzle 51, a deep cleaning of the cleaning roller 4 is achieved, the cleaning effect is more thorough, and the cleaning performance of the cleaning roller 4 is further guaranteed, maintaining the cleaning effect on the steel belt 2.

[0046] In some embodiments, the linear velocity direction of the cleaning roller 4 toward the cleaning brush 6 is a first direction. The portion of the cleaning brush 6 above the steel belt 2 is a first portion, and the portion of the cleaning brush 6 below the steel belt 2 is a second portion.

[0047] Please see Figure 3 The comb teeth 61 include a plurality of first comb teeth 611 and a plurality of second comb teeth 612. The plurality of first comb teeth 611 are evenly distributed in a first portion, and their inclination direction is opposite to the first direction of the cleaning roller 4 located above the steel belt 2. The plurality of second comb teeth 612 are evenly distributed in a second portion, and their inclination direction is opposite to the first direction of the cleaning roller 4 located below the steel belt 2.

[0048] The comb teeth 61 include a first comb tooth 611 and a second comb tooth 612, and the inclination directions of the first comb tooth 611 and the second comb tooth 612 are respectively opposite to the first direction of the corresponding cleaning roller 4. When the cleaning roller 4 contacts the cleaning brush plate 6, this makes the relative movement direction of the comb teeth 61 and the bristles of the cleaning roller 4 more conducive to removing dirt. For example, when the first direction of the cleaning roller 4 located above the steel belt 2 is downward, the first comb tooth 611 is inclined upward, so that when the cleaning roller 4 rotates, the bristles rub against the first comb tooth 611 in the opposite direction, which can more efficiently scrape off the oil stains attached to the bristles, ensuring that the cleaning roller 4 continues to perform a good cleaning function.

[0049] In some embodiments, see Figure 1 and Figure 4 A slide rail 71 is fixedly installed on the cleaning box 1 above the steel belt 2, and a slider 31 is fixedly installed on the top of the movable bracket 3. The slider 31 is slidably connected to the slide rail 71.

[0050] The slide rail 71 above the cleaning box 1 is slidably connected to the slider 31 at the top of the movable support 3, providing stable support and guidance for the movable support 3. During the reciprocating movement of the movable support 3, the slider 31 slides smoothly along the slide rail 71, ensuring the accurate movement trajectory of the cleaning roller 4 and maintaining good contact with the steel belt 2 at all times. This prevents the movable support 3 from shifting or shaking during movement, avoids poor contact between the cleaning roller 4 and the steel belt 2, which would affect the cleaning effect, and ensures the stable operation of the steel belt 2 cleaning work.

[0051] In some embodiments, see Figure 1 and Figure 4 A reciprocating screw 72 is rotatably mounted on the slide rail 71. The axial direction of the reciprocating screw 72 is the same as the moving direction of the movable bracket 3. The reciprocating screw 72 is threadedly connected to the slider 31. A first motor 73 is fixedly mounted on the slide rail 71, and the output end of the first motor 73 is connected to the reciprocating screw 72.

[0052] The reciprocating screw 72 on the slide rail 71 is threadedly connected to the slider 31, and the reciprocating screw 72 is driven by the first motor 73. When the first motor 73 starts, it drives the reciprocating screw 72 to rotate. Through the threaded transmission between the reciprocating screw 72 and the slider 31, the slider 31 drives the moving bracket 3 to move back and forth along the slide rail 71, which improves the degree of automation of the device and ensures the regularity and stability of the cleaning work.

[0053] In some embodiments, see Figure 1 and Figure 2 The first nozzle 51, the cleaning roller 4, and the cleaning brush 6 are arranged in sequence along the traveling direction of the steel belt 2. The cleaning brush 6 is located in front of the water outlet of the first nozzle 51. When the cleaning roller 4 moves to avoid any cleaning brush 6, the first nozzle 51 can directly spray the avoided cleaning brush 6.

[0054] It should be noted that the spraying range of the first nozzle 51 covers the two cleaning brush plates 6 and the cleaning roller 4 that moves between the two cleaning brush plates 6. As the cleaning roller 4 moves back and forth with the moving bracket 3, it alternately contacts the two cleaning brush plates 6. When the cleaning roller 4 moves to avoid either of the cleaning brush plates 6, the water flow sprayed by the first nozzle 51 can directly rinse the avoided cleaning brush plate 6 due to the lack of obstruction from the cleaning roller 4, which also ensures the cleanliness of the cleaning brush plate 6 itself to a certain extent.

[0055] In some embodiments, see Figure 1 and Figure 2 The cleaning box 1 is equipped with a first steering roller 81, a second steering roller 82, a third steering roller 83, and a fourth steering roller 84 that rotate sequentially along the traveling direction of the steel belt 2. The steel belt 2 is wound around the first steering roller 81, the second steering roller 82, the third steering roller 83, and the fourth steering roller 84. The first steering roller 81 and the fourth steering roller 84 are at a first height, and the second steering roller 82 and the third steering roller 83 are at a second height. The first height is higher than the second height.

[0056] The four steering rollers on the cleaning box 1 cause the steel belt 2 to travel along a specific winding path, thereby adjusting the posture and tension of the steel belt 2 in the cleaning box 1. This allows the steel belt 2 to pass more smoothly through components such as the cleaning roller 4 and the cleaning brush 6, while also increasing the residence time of the steel belt 2 in the cleaning box 1, thus improving the cleaning effect and quality.

[0057] In some embodiments, see Figure 1 and Figure 2 The first nozzle 51, the cleaning roller 4, and the cleaning brush 6 are located between the second steering roller 82 and the third steering roller 83.

[0058] The first nozzle 51, cleaning roller 4, and cleaning brush 6 are positioned between the second guide roller 82 and the third guide roller 83 to ensure that the steel strip 2 is cleaned in the flattest and most stable condition. As the steel strip 2 passes through the second guide roller 82 and the third guide roller 83, its posture remains stable, allowing the cleaning roller 4 to act evenly on the surface of the steel strip 2. The cleaning brush 6 and the first nozzle 51 can also better clean and maintain the cleaning roller 4, ensuring the entire cleaning process is efficient and stable, improving the pretreatment effect of the steel strip 2, and providing a good foundation for subsequent plastic coating.

[0059] In some embodiments, see Figure 1 and Figure 2 Two second nozzles 52 are fixedly installed on the cleaning box 1, with the outlets of the two second nozzles 52 facing the upper and lower sides of the steel belt 2 respectively. The two second nozzles 52 are located between the third steering roller 83 and the fourth steering roller 84.

[0060] After the steel strip 2 is cleaned by the cleaning roller 4, the second nozzle 52 can perform a secondary spray cleaning on the steel strip 2, which can further wash away the small impurities or residual cleaning liquid that the cleaning roller 4 failed to completely remove, ensuring that the surface of the steel strip 2 is cleaner, improving the cleanliness of the steel strip 2, meeting the strict requirements of the plastic coating process for the surface cleanliness of the steel strip 2, and improving the manufacturing quality of the corrugated pipe.

[0061] In some embodiments, see Figure 1 Two second motors 32 are fixedly mounted on the movable support 3. Each second motor 32 corresponds to one cleaning roller 4, and the output end of each second motor 32 is connected to the corresponding cleaning roller 4. The rotation direction of the two cleaning rollers 4 is opposite to the travel direction of the steel belt 2.

[0062] It should be noted that the second motor 32 is a waterproof motor.

[0063] The second motor 32 on the movable support 3 drives the cleaning roller 4 to rotate in the opposite direction to the travel direction of the steel strip 2. This increases the relative speed between the cleaning roller 4 and the surface of the steel strip 2, increasing the friction between them. When the steel strip 2 moves forward, the cleaning roller 4 rotates in the opposite direction, which can more effectively scrape off the oil stains on the surface of the steel strip 2. Compared with rotating in the same direction or relying on the steel strip 2 to drive the cleaning roller 4 to rotate, the cleaning effect is significantly improved, ensuring that impurities on the surface of the steel strip 2 are more thoroughly removed, providing high-quality surface conditions for the coating process.

[0064] In summary, the steel strip pretreatment device provided by this utility model, compared with the prior art, allows the cleaning roller 4 to clean the upper and lower surfaces of the steel strip 2 by its own rotation when the steel strip 2 moves, removing impurities such as the oily protective layer from the surface of the steel strip 2, thus preparing it for subsequent plastic coating treatment. During the cleaning process of the cleaning roller 4, the first nozzle 51 can spray water or cleaning fluid onto the cleaning roller 4 to perform preliminary rinsing on the surface of the cleaning roller 4, washing away some of the attached dirt.

[0065] Meanwhile, during the reciprocating movement of the movable support 3, when the cleaning roller 4 moves to contact the cleaning brush plate 6, the cleaning brush plate 6 will scrub the cleaning roller 4, further removing the residual dirt on the cleaning roller 4. Through the rinsing of the first nozzle 51 and the scrubbing of the cleaning brush plate 6, the continuous accumulation of dirt on the cleaning roller 4 is effectively avoided, ensuring that the cleaning roller 4 always maintains a good cleaning effect, thereby ensuring that the steel strip 2 can be continuously and efficiently cleaned.

[0066] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A steel strip plastic coating pretreatment device, characterized in that, include: A cleaning box (1) is set on the travel path of the steel belt (2); the steel belt (2) passes through the cleaning box (1); The movable support (3) is reciprocated on the cleaning box (1), and the moving direction is perpendicular to the traveling direction of the steel strip (2) and parallel to the surface of the steel strip (2); Two cleaning rollers (4) are rotatably mounted on the movable support (3), and the outer circumferential surfaces of the two cleaning rollers (4) abut against the upper and lower surfaces of the steel strip (2); Two first nozzles (51) are fixedly mounted on the cleaning box (1), and the two water outlets are respectively oriented towards the two cleaning rollers (4); and Two cleaning brushes (6) are arranged at intervals on the cleaning box (1) along the moving direction of the moving bracket (3) and are located on both sides of the steel belt (2); During the reciprocating movement of the movable support (3), the two cleaning rollers (4) are always in contact with the steel belt (2), and the two cleaning rollers (4) alternately contact the two cleaning brushes (6).

2. The steel strip plastic coating pretreatment device as described in claim 1, characterized in that, The cleaning brush plate (6) has inclined comb teeth (61) on the side facing the cleaning roller (4). When the cleaning roller (4) comes into contact with the cleaning brush plate (6), the comb teeth (61) extend into the bristles of the cleaning roller (4) to clean the cleaning roller (4).

3. The steel strip plastic coating pretreatment device as described in claim 2, characterized in that, The linear velocity direction of the cleaning roller (4) facing the cleaning brush plate (6) is the first direction; the portion of the cleaning brush plate (6) above the steel strip (2) is the first part, and the portion of the cleaning brush plate (6) below the steel strip (2) is the second part; the comb teeth (61) include: Multiple first comb teeth (611) are evenly distributed in the first part and their inclination direction is opposite to the first direction of the cleaning roller (4) located above the steel strip (2); Multiple second comb teeth (612) are evenly distributed in the second part and are inclined in the opposite direction to the first direction of the cleaning roller (4) located below the steel strip (2).

4. The steel strip plastic coating pretreatment device as described in claim 1, characterized in that, A slide rail (71) is fixedly installed on the cleaning box (1) above the steel belt (2), and a slider (31) is fixedly installed on the top of the movable bracket (3). The slider (31) is slidably connected to the slide rail (71).

5. The steel strip plastic coating pretreatment device as described in claim 4, characterized in that, A reciprocating screw (72) is rotatably mounted on the slide rail (71). The axial direction of the reciprocating screw (72) is the same as the moving direction of the moving bracket (3). The reciprocating screw (72) is threadedly connected to the slider (31). A first motor (73) is fixedly installed on the slide rail (71), and the output end of the first motor (73) is connected to the reciprocating lead screw (72).

6. The steel strip plastic coating pretreatment device as described in claim 1, characterized in that, The first nozzle (51), the cleaning roller (4) and the cleaning brush (6) are arranged in sequence along the traveling direction of the steel belt (2). The cleaning brush (6) is located in front of the outlet of the first nozzle (51). When the cleaning roller (4) moves to avoid any of the cleaning brush (6), the first nozzle (51) can directly spray the avoided cleaning brush (6).

7. The steel strip plastic coating pretreatment device as described in claim 1, characterized in that, The cleaning box (1) is provided with a first steering roller (81), a second steering roller (82), a third steering roller (83) and a fourth steering roller (84) rotating sequentially along the traveling direction of the steel strip (2), and the steel strip (2) is wound around the first steering roller (81), the second steering roller (82), the third steering roller (83) and the fourth steering roller (84); The first steering roller (81) and the fourth steering roller (84) are at a first height, and the second steering roller (82) and the third steering roller (83) are at a second height, with the first height being higher than the second height.

8. The steel strip plastic coating pretreatment device as described in claim 7, characterized in that, The first nozzle (51), the cleaning roller (4) and the cleaning brush (6) are located between the second steering roller (82) and the third steering roller (83).

9. The steel strip plastic coating pretreatment device as described in claim 7, characterized in that, Two second nozzles (52) are fixedly installed on the cleaning box (1), and the water outlets of the two second nozzles (52) face the upper and lower sides of the steel strip (2) respectively. The two second nozzles (52) are located between the third steering roller (83) and the fourth steering roller (84).

10. The steel strip plastic coating pretreatment device as described in claim 1, characterized in that, Two second motors (32) are fixedly installed on the movable support (3). The second motors (32) correspond one-to-one with the cleaning rollers (4). The output end of each second motor (32) is connected to the corresponding cleaning roller (4). The two cleaning rollers (4) rotate in the opposite direction to the travel direction of the steel strip (2).

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