A continuous production process for straightening steel strip

Abstract

The present application relates to a kind of continuous production processes of straightening strip steel, comprising the following steps: S1, the strip steel of pre-processing is obtained by processing;S2, the pre-processing strip steel is sent into 1# tension roller, inlet loop and 2# tension roller in turn, and the strip steel of first tension adjustment is obtained;S3, the strip steel of first tension adjustment is sent into pull straightening machine, and the strip steel of improved flatness is obtained;S4, the strip steel of improved flatness is sent into cleaning equipment and drying equipment in turn, and the bright strip is obtained;S5, the bright strip is sent into 3# tension roller, outlet loop and 4# tension roller in turn, and the strip steel of second tension adjustment is obtained;S6, the strip steel of second tension adjustment is sent into surface inspection station, and after completing surface inspection, it is cut into outlet shear equipment, and finally it is wound into coiler and is wound up.The method can be straightened to improve the version of 2B or BA surface stainless steel product, realize continuous production, and the product flatness is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of stainless steel coil processing, in particular to a continuous production process for straightening strip steel. BACKGROUND

[0002] In the field of stainless steel cold strip production, a skin pass mill is usually used to solve the problem of stainless steel skin type. However, the stainless steel skin pass mill usually adopts two-roll skin pass, and the roll diameter is relatively large, so the skin pass mill has relatively weak ability to solve the skin type problem, especially when the skin type is medium wave. It is difficult to eliminate the skin type with a skin pass mill.

[0003] Using a tension leveler to straighten the strip steel can achieve good results, but the tension leveler also has the risk of causing defects in the strip steel again, such as indentation defects, scratches, and parking marks. Therefore, the tension leveler used for straightening the strip steel needs to be able to produce continuously and stably, and cannot cause defects in the strip steel again due to poor stability of the unit.

[0004] Patent application CN115591945A discloses a method for reducing degraded products by changing the work roll of a skin pass mill in a hot galvanizing production line, which includes the following steps: step one: reduce the speed of the strip steel in process one and process two; step two: when the strip steel weld reaches the outlet of the skin pass mill, the speed of the strip steel in process two is reduced to 0 m / min; step three: replace the work roll of the skin pass mill and flush the replaced work roll; step four: after the flushing of the work roll of the skin pass mill is completed, the strip steel in process two starts to run at the minimum speed specified by the skin pass mill, the tension leveler and the roll coater, and when the skin pass mill, the tension leveler and the roll coater start to skin, tension and roll coating, the speed of the strip steel in process two is gradually increased, and the intermediate loop is released until the normal production speed of process one and process two is restored. In this scheme, the function of the intermediate loop is used to store the strip steel, so that the strip steel in process two is not continuously running during the replacement of the work roll of the skin pass mill. Take this opportunity to replace the skin pass mill work roll with a new skin pass work roll. After the replacement is completed, the unskinned part is cut off at the outlet section of the flying shear to reduce the production of degraded products. This method requires synchronous control of multiple nodes, which is difficult to operate, and frequent shutdown of process two is not conducive to efficient production of strip steel. SUMMARY

[0005] The purpose of the present application is to overcome the problems existing in the straightening of strip steel and provide a continuous production process for straightening strip steel.

[0006] The specific scheme is as follows:

[0007] A continuous production process for straightening strip steel includes the following steps:

[0008] S1, send the steel coil to the reel shaft of the uncoiler for uncoiling operation, complete the uncoiling, and then send it to the welding machine area for welding, then use the edge cutting equipment to cut the edge of the welding area to obtain the pre-processed strip steel;

[0009] S2, the pre-processed strip steel is sequentially sent into a 1# tension roller, an inlet loop and a 2# tension roller to obtain a strip steel with primary tension adjustment; the inlet loop is a vertical loop, the distance between the top roller and the bottom fixed roller is 10-15 meters, and both the top loop roller and the bottom fixed roller are driven to keep consistent with the moving speed of the strip steel.

[0010] S3, the strip steel with primary tension adjustment is sent into a tension leveler to obtain a strip steel with improved flatness; the tension leveler is a wet tension leveler, which comprises a bending unit and a straightening unit, the inlet and outlet of the bending unit and the inlet and outlet of the straightening unit are all provided with straightening liquid nozzles to spray straightening liquid on the upper and lower surfaces of the strip steel.

[0011] S4, the strip steel with improved flatness is sequentially sent into a cleaning device and a drying device to obtain a bright strip;

[0012] S5, the bright strip is sequentially sent into a 3# tension roller, an outlet loop and a 4# tension roller to obtain a strip steel with secondary tension adjustment; the outlet loop is a vertical loop, the distance between the top roller and the bottom fixed roller is 10-15 meters, and both the top loop roller and the bottom fixed roller are driven to keep consistent with the moving speed of the strip steel.

[0013] S6, the strip steel with secondary tension adjustment is sent into a surface inspection station, and after surface inspection, it is cut into a strip by an outlet cutting device and finally wound by a winding machine.

[0014] Further, the roll diameter of the loop rollers of the inlet loop and the outlet loop is 800-1000mm, and the roll body rotational inertia is not more than 25KGxm 2 .

[0015] Further, the inlet loop and the outlet loop each comprise 7-9 loop rollers arranged in two rows, so that the strip steel passes through the loop rollers in a few-shaped manner, the distance between adjacent loop rollers is 1-2.5m, and the time for the strip steel to pass through the inlet loop is 6-8 minutes.

[0016] Further, the 2# tension roller and the 3# tension roller are both 6-roller tension rollers, the roller surface is tungsten carbide, the surface is roughened, the surface roughness is Ra≥3.0μm, and the roughness skew index Rsk is <0; or the roller surface is polyurethane, the surface is roughened, the surface roughness is Ra≥3.0μm, and the roughness skew index Rsk index is controlled within ±0.8.

[0017] Further, the inlet of the tension leveler is provided with 2 stabilizing rollers, and the outlet is provided with 1 stabilizing roller, and the stabilizing rollers are all connected to a transmission device, so that the rotating speed of the stabilizing rollers is consistent with the running speed of the strip steel.

[0018] Further, the straightening liquid is an acidic solution or lubricating oil.

[0019] Further, the spraying angle of the straightening liquid nozzle relative to the strip steel is adjustable.

[0020] Further, the inlet and outlet of the straightening mill are both provided with tension rollers, the tension rollers are 6-roller tension rollers, the roller body is provided with a scraper, and the roll diameter is 1000mm-1500mm.

[0021] Further, the roller surface of the tension roller is tungsten carbide, the surface is roughened, the surface roughness is Ra≥3.0μm, and the roughness skewness index Rsk is <0; or the roller surface is polyurethane, the surface is roughened, the surface roughness is Ra≥3.0μm, and the roughness skewness index Rsk index is controlled within ±0.8.

[0022] Further, the bottom of the rack of the straightening mill is provided with a straightening liquid collecting groove, which collects the straightening liquid and returns to the straightening liquid supply tank after being filtered by a filtering unit.

[0023] Beneficial effects: the method provided by the application improves the overall stability by setting a loop at the inlet and outlet of the straightening mill, and ensures the continuous and stable operation of the strip steel in the straightening mill. The inlet loop is used to store the strip steel to buffer the time for entering the straightening mill for straightening operation, and the outlet loop is used to store the strip steel to buffer the time for outlet operation, thereby ensuring the continuous production of the unit when each large coil is divided into small coils; the inlet loop and the outlet loop cooperate to realize continuous operation and reduce the straightening machine stop roll marks caused by shutdown.

[0024] Further, the vertical loop is used in the application, which can reduce the number of strip steel contact rollers and further reduce the area of the strip steel contact loop roller, thereby reducing the possible scratching phenomenon.

[0025] In addition, the surface of the tension roller in the application is made of tungsten carbide material, the surface is roughened, the surface roughness is Ra≥3.0μm, and the roughness skewness index Rsk is <0; or the surface of the tension roller is lined with polyurethane material, the surface is roughened, the surface roughness is Ra≥3.0μm, and the roughness skewness index Rsk index is controlled within ±0.8, so as to improve the flatness of the strip steel surface.

[0026] Finally, the wet straightening mill is used in the application to improve the strip steel pattern, a cleaning device and a hot air drying device are arranged behind the wet straightening mill, an inlet tension roller (i.e. 2# tension roller) is arranged at the inlet of the straightening mill, and an outlet roller tension roller (i.e. 3# tension roller) is arranged at the hot air drying outlet, so as to keep the tension of the strip steel within a suitable range, improve the stability of operation, and be beneficial to maintaining continuous production operation. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the present application, the drawings will be briefly introduced as follows. Obviously, the drawings described in the following description are only some embodiments of the present application and not a limitation of the present application.

[0028] Figure 1 is a schematic diagram of the device structure provided by an embodiment 1 of the present application; in the diagram: 1# uncoiler 1, 2# uncoiler 2, welding machine 3, edge cutting shearing equipment 4, 1# tension roller 5, entry loop 6, 2# tension roller 7, straightening machine 8, cleaning equipment 9, drying equipment 10, 3# tension roller 11, exit loop 12, 4# tension roller 13, surface inspection station 14, exit shearing equipment 15, coiler 16. DETAILED DESCRIPTION

[0029] The preferred embodiments of the present application will be described in more detail below. Although the preferred embodiments of the present application are described below, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. If no specific technology or condition is specified in the examples, the technology or condition described in the literature in the art or according to the product manual is used.

[0030] Flatness: The flatness of the present application reflects the index of the flatness degree of the strip steel. The flatness refers to the deviation of the strip steel surface from the closest plane, i.e. the distance difference between the strip steel surface and a plane. The flatness is tested on the strip steel surface by using a flatness tester.

[0031] Example 1

[0032] A continuous production process for straightening strip steel, using a stainless steel bright strip continuous straightening machine group as shown in Figure 1 The main process flow is as follows:

[0033] The steel coil on the coil saddle is sent to the drum shaft of the 1# uncoiler 1 or the 2# uncoiler 2 by the coil car for uncoiling operation. The strip head is sent to the entry shears for cutting off the defective part. The strip head is then sent to the welding machine 3 area by the feed clamp roller for welding. After welding, the edge cutting shearing equipment 4 is used to cut the edge of the welding area to obtain the pre-processed strip steel.

[0034] Two uncoilers are used in this embodiment to facilitate continuous production. The 1# uncoiler and the 2# uncoiler can alternately perform uncoiling operation. When one side is normally uncoiling, the other side can use a forklift or a travelling crane for loading, saving the downtime for loading, so that the production line can continuously and efficiently produce.

[0035] The pre-processed strip steel processed by the above process is sent to the 1# tension roller 5 to improve the tension of the strip steel so that it can smoothly enter the entry loop 6 to ensure that the strip steel can continuously and stably run in the straightening machine 8.

[0036] The entry loop 6 is in the form of vertical loop, the distance between the top loop roller and the bottom fixed roller is controlled within 15 meters. Both the top loop roller and the bottom fixed roller are driven. The diameter of the loop roller is controlled within 800mm-1000mm, and the moment of inertia of the roller body is not more than 25KGxm 2 The surface of the loop roller is coated with tungsten carbide material, and the surface is roughened, with the surface roughness Ra≥3.0μm, and the roughness skew index Rsk<0. The loop capacity satisfies the operation time of 6 minutes for the entry and exit, so as to avoid the stop of the tension leveler as much as possible, and to ensure the stable operation.

[0037] After the strip steel passes through the entry loop 6, it enters the 2# tension roller 7. The 2# tension roller 7 is a 6-roller tension roller containing tungsten carbide material. Due to the tungsten carbide layer on the surface, the tension roller has excellent corrosion resistance and wear resistance, which can avoid the wear caused by the vibration of the strip steel when entering the tension roller, and the relative sliding between the tension roller and the strip steel caused by the start and sudden stop of the tension roller, thereby improving the flatness of the surface of the strip steel. Specifically, the surface of the 2# tension roller 7 is roughened, with the surface roughness Ra≥3.0μm, and the roughness skew index Rsk<0.

[0038] After the strip steel passes through the 2# tension roller 7, it enters the tension leveler 8. The tension leveler 8 is a wet tension leveler, which is used to improve the profile of the strip steel. It can adopt two-bending-one-straightening mode or two-bending-two-straightening mode. Regardless of which mode is adopted, two stabilizing rollers are arranged at the inlet, and one stabilizing roller is arranged at the outlet. All the stabilizing rollers are driven to ensure that the rotating speed of the stabilizing rollers is consistent with the speed of the strip steel. The inlet and outlet of the bending unit of the tension leveler 8, and the inlet and outlet of the straightening unit, are all provided with straightening liquid nozzles. The straightening liquid nozzles are arranged on the upper and lower surfaces of the strip steel, and the spray angle of the nozzles relative to the strip steel is adjustable. The straightening liquid is an acidic solution, such as dilute sulfuric acid.

[0039] The inlet tension roller and the outlet tension of the tension leveler 8 are in the form of 6-roller tension roller, which are arranged horizontally, and all the tension rollers are driven. The diameter of the tension roller is controlled within 1000mm-1500mm, which satisfies the production of stainless steel products with the thickness ranging from 0.05mm to 3mm. The tension roller body is provided with a scraper for regular cleaning of the roller surface. The surface of the tension roller is coated with tungsten carbide material, and the surface is roughened, with the surface roughness Ra≥3.0μm, and the roughness skew index Rsk<0.

[0040] After the strip steel passes through the tension leveler 8, it passes through the cleaning device 9 and the drying device 10. The cleaning device 9 mainly washes the strip steel with hot water to clean the straightening liquid brought by the tension leveler 8 and the surface of the incoming material, and then squeezes the strip steel with a squeezing roller to make the strip steel surface only have or partially have hot water.

[0041] The drying device 10 uses a hot air circulation blowing method to dry the strip steel. A fan installed above or beside the device extracts the hot air in the dryer, mixes it with external air, and then recycles it.

[0042] The dried strip steel enters an exit loop 12 through a 3# tension roller 11. The exit loop 12 is in a vertical loop form, and the distance between the top loop roller and the bottom fixed roller is controlled within 15 meters. Both the top loop roller and the bottom fixed roller are driven. The diameter of the loop roller is controlled within 800mm-1000mm, and the moment of inertia of the roller body is not more than 25KGxm 2 The surface of the loop roller is lined with tungsten carbide material, and the surface is roughened. The surface roughness is Ra≥3.0μm, and the roughness skew index Rsk is controlled to be less than 0. The loop capacity satisfies the operating time of 6 minutes at the inlet and outlet, so as to avoid the stop of the straightening machine as much as possible and ensure stable operation.

[0043] The strip steel passes through the exit loop 12 to store the strip steel and buffer the exit operation time, so as to ensure the continuous production of the unit when each large coil is divided into small coils, and to reduce the stop roll mark of the straightening machine due to stop.

[0044] After passing through the exit loop 12, the strip steel enters a 4# tension roller 13 to increase the tension again for subsequent winding operation. The strip steel with tension is inspected by a surface inspection station 14, and then enters an exit cutting device 15 for cutting. The obtained stainless steel bright strip enters a coiler 16 for winding.

[0045] The stainless steel bright strip obtained by the above method has a smooth and flat surface, a surface flatness of ≤5%, a strong metal luster, and can be continuously produced.

[0046] Example 2

[0047] A continuous production process for straightening strip steel uses the same stainless steel bright strip continuous straightening and leveling unit as in Example 1, and the main process flow is as follows:

[0048] A coil is sent to the reel shaft of a 1# uncoiler 1 or a 2# uncoiler 2 by a coil loading truck for uncoiling operation. The strip head is sent to an inlet cutting device to cut off the defective part, and then sent to a welding machine 3 area by a feeding clamp roller for welding. After welding, a edge cutting device 4 is used to cut the edge of the welding area to obtain a pre-processed strip steel.

[0049] Two uncoilers are used in this example to facilitate continuous production. The 1# uncoiler and the 2# uncoiler can alternately perform uncoiling operation. When one side is normally uncoiling, the other side can use a forklift or a crane to load, saving the downtime for loading, so that the production line can continuously and efficiently produce.

[0050] The pre-processed strip steel after the above processing is sent to the 1# tension roller 5 to increase the tension of the strip steel by the 1# tension roller 5 so as to smoothly enter the entrance loop 6, thereby ensuring the continuous and stable operation of the strip steel in the tension leveler 8.

[0051] The entrance loop 6 is in the form of a vertical loop, the distance between the top roller and the bottom fixed roller is controlled within 15 meters. Both the top roller and the bottom fixed roller are driven. The diameter of the loop roller is controlled within 800mm-1000mm, and the moment of inertia of the roller body is not more than 25KGxm 2 The surface of the loop roller is lined with polyurethane material, and the surface is roughened. The surface roughness is Ra≥3.0μm, and the roughness skew index Rsk is controlled within ±0.8. The loop capacity satisfies the operation time of 6 minutes at the entrance and the exit, so as to avoid the shutdown of the tension leveler as much as possible and ensure the stable operation.

[0052] After the strip steel passes through the entrance loop 6, it enters the 2# tension roller 7. The 2# tension roller 7 is a 6-roller tension roller containing tungsten carbide material. Due to the tungsten carbide layer on the surface, the tension roller has excellent corrosion resistance and wear resistance, which can avoid the wear caused by the vibration of the strip steel when entering the tension roller, and the relative sliding between the tension roller and the strip steel caused by the start and sudden stop of the tension roller, thereby improving the flatness of the surface of the strip steel. Specifically, the surface of the 2# tension roller 7 is roughened, and the surface roughness is Ra≥3.0μm, and the roughness skew index Rsk is less than 0.

[0053] After the strip steel passes through the 2# tension roller 7, it enters the tension leveler 8. The tension leveler 8 is a wet tension leveler, which uses a wet tension leveler to improve the profile of the strip steel. It can use two-bend-one-straight mode or two-bend-two-straight mode. Regardless of which mode, two stabilizing rollers are arranged at the entrance, and one stabilizing roller is arranged at the exit. All the stabilizing rollers are provided with a transmission device to ensure that the rotating speed of the stabilizing roller is consistent with the speed of the strip steel. The entrance and exit of the bending unit of the tension leveler 8, and the entrance and exit of the straightening unit, are provided with straightening liquid nozzles. The straightening liquid nozzles are arranged on the upper and lower surfaces of the strip steel, the spray angle of the nozzles relative to the strip steel is adjustable, and the straightening liquid is lubricating oil.

[0054] The entrance and exit tension rollers of the tension leveler 8 are in the form of 6-roller tension rollers, which are horizontally arranged, and all the tension rollers are driven. The diameter of the tension roller is controlled within 1000mm-1500mm, which satisfies the production of stainless steel products with a thickness ranging from 0.05mm to 3mm. The tension roller body is provided with a scraper for periodic cleaning of the roller surface. The surface of the tension roller is lined with tungsten carbide material, and the surface is roughened. The surface roughness is Ra≥3.0μm, and the roughness skew index Rsk is less than 0.

[0055] After the strip steel passes through the straightening machine 8, it passes through the cleaning device 9 and the drying device 10. The cleaning device 9 mainly uses hot water to clean the strip steel from the straightening liquid brought by the straightening machine 8 and the surface of the incoming material, and the strip steel surface is only left with or part of hot water after being squeezed by the squeezing roller.

[0056] The drying device 10 uses air knives to blow the strip steel surface to ensure the cleanliness of the strip steel surface.

[0057] After drying, the strip steel passes through the 3# tension roller 11 into the exit loop 12. The exit loop 12 adopts a vertical loop form, and the distance between the top loop roller and the bottom fixed roller is controlled within 15 meters. Both the top loop roller and the bottom fixed roller are driven. The loop roller diameter is controlled within 800mm-1000mm, and the roller body rotational inertia is not more than 25KGxm 2 . The loop roller surface is lined with polyurethane material, and the surface is roughened. The surface roughness Ra is greater than or equal to 3.0μm, and the roughness skew index Rsk is controlled within ±0.8. The loop amount satisfies the operating time of 6 minutes at the inlet and outlet, which avoids the shutdown of the straightening machine as much as possible to ensure stable operation.

[0058] The strip steel passes through the exit loop 12 to store the strip steel and buffer the exit operation time, thereby ensuring the continuous production of the unit when each large coil is divided into small coils; at the same time, the straightening machine stop roll mark caused by shutdown is reduced.

[0059] After passing through the exit loop 12, the strip steel enters the 4# tension roller 13 to increase the tension again for subsequent winding operation. The strip steel with tension passes through the surface inspection station 14 and then enters the exit cutting device 15 for slitting. The obtained stainless steel bright strip enters the coiler 16 for winding.

[0060] The stainless steel bright strip obtained by the above method has a smooth and flat surface, a surface flatness of less than or equal to 4%, a strong metal luster, and can be continuously produced.

[0061] Example 3

[0062] A continuous production process for straightening strip steel uses the same stainless steel bright strip continuous straightening machine group as in Example 1, and the main process flow is as follows:

[0063] The steel coil on the steel coil saddle is sent to the reel shaft of the 1# uncoiler 1 or the 2# uncoiler 2 by the coil car for uncoiling operation. The strip head is sent to the inlet shear to cut off the defective part of the strip head, and then the strip head is sent to the welding machine 3 area by the feeding clamp roller for welding. After welding, the welding seam area is trimmed by the edge cutting device 4 to obtain the pre-processed strip steel.

[0064] The two uncoilers are used for continuous production. The 1# uncoiler and the 2# uncoiler can be used alternately. When one of them is used for uncoiling, the other can be used for feeding. Thus, the feeding time is saved, and the production line can be continuously and efficiently produced.

[0065] The pre-processed strip steel is sent to the 1# tension roller 5. The 1# tension roller 5 is used to increase the tension of the strip steel, so that the strip steel can smoothly enter the inlet loop 6, and the strip steel can continuously and stably run in the tension leveler 8.

[0066] The inlet loop 6 is a vertical loop. The distance between the top roller and the bottom fixed roller is controlled within 15 meters. Both the top roller and the bottom fixed roller are driven. The diameter of the loop roller is controlled within 800mm-1000mm, and the rotational inertia of the roller body is not more than 25KGxm 2 The surface of the loop roller is coated with tungsten carbide material, and the surface is roughened. The surface roughness is Ra≥3.0μm, and the roughness skew index Rsk is controlled to be Rsk<0. The loop capacity satisfies the operation time of 6 minutes for the inlet and outlet. The tension leveler is avoided to be stopped as much as possible, and the stable operation is ensured.

[0067] After the strip steel passes through the inlet loop 6, it enters the 2# tension roller 7. The 2# tension roller 7 is a 6-roller tension roller containing tungsten carbide material. Because the surface has a tungsten carbide layer, the tension roller has excellent corrosion resistance and wear resistance. The wear caused by the vibration of the strip steel entering the tension roller is avoided. The relative sliding between the tension roller and the strip steel caused by the start and sudden stop of the tension roller is avoided. Thus, the flatness of the surface of the strip steel is improved. Specifically, the surface of the 2# tension roller 7 is roughened, and the surface roughness is Ra≥3.0μm, and the roughness skew index Rsk is less than 0.

[0068] After the strip steel passes through the 2# tension roller 7, it enters the tension leveler 8. The tension leveler 8 is a wet tension leveler. The wet tension leveler is used to improve the profile of the strip steel. Two-bend-one-straight mode or two-bend-two-straight mode can be used. Regardless of the mode, two stabilizing rollers are arranged at the inlet, and one stabilizing roller is arranged at the outlet. The stabilizing rollers are all driven to ensure that the rotational speed of the stabilizing rollers is consistent with the speed of the strip steel. The inlet and outlet of the bending unit of the tension leveler 8 and the inlet and outlet of the straightening unit are all provided with straightening liquid nozzles. The straightening liquid nozzles are arranged on the upper and lower surfaces of the strip steel. The spray angle of the nozzles relative to the strip steel is adjustable. The straightening liquid is an acidic solution, such as dilute sulfuric acid. The tension leveler 8 collects the straightening liquid through the collection groove at the bottom of the rack, filters the straightening liquid through the filtering unit, and returns the straightening liquid to the straightening liquid supply tank for recycling.

[0069] The inlet tension roller and the outlet tension roller of the straightening machine 8 are in the form of 6-roller tension rollers, are horizontally arranged, and are all driven. The diameter of the tension roller is controlled to be 1000mm-1500mm, which satisfies the production of stainless steel products with a thickness of 0.05mm-3mm. The tension roller is provided with a scraper for regularly cleaning the roller surface. The surface of the tension roller is coated with tungsten carbide material and is roughened, and the surface roughness is Ra≥3.0μm and the roughness skew index Rsk is less than 0.

[0070] After the strip steel passes through the straightening machine 8, it passes through the cleaning device 9 and the drying device 10. The cleaning device 9 mainly washes the strip steel with hot water to clean the straightening liquid brought by the straightening machine 8 and the surface of the incoming material, and the strip steel surface is only left with or partially left with hot water after being squeezed by the squeezing roller.

[0071] The drying device 10 blows the strip steel surface with an air knife until there is no moisture and impurities, and a smooth surface is exposed.

[0072] The dried strip steel passes through the 3# tension roller 11 and enters the outlet loop 12. The outlet loop 12 is in the form of a vertical loop, the distance between the top loop roller and the bottom fixed roller is controlled to be within 15 meters, and both the top loop roller and the bottom fixed roller are driven. The diameter of the loop roller is controlled to be 800mm-1000mm, and the moment of inertia of the roller body is not more than 25KGxm 2 . The surface of the loop roller is coated with polyurethane material and is roughened, and the surface roughness is Ra≥3.0μm and the roughness skew index Rsk is controlled to be ±0.8. The loop capacity satisfies the operation time of 6 minutes at the inlet and outlet, which avoids the shutdown of the straightening machine as much as possible and ensures stable operation.

[0073] The strip steel passes through the outlet loop 12 to store the strip steel and buffer the outlet operation time, so as to ensure the continuous production of the unit when each large coil is divided into small coils, and to reduce the straightening machine stop roll marks caused by shutdown.

[0074] After passing through the outlet loop 12, the strip steel enters the 4# tension roller 13 to increase the tension again for subsequent winding operation. The strip steel with tension is checked by the surface inspection station 14, and then enters the outlet cutting device 15 for slitting, and the obtained stainless steel bright strip enters the winding machine 16 for winding.

[0075] The stainless steel bright strip obtained by the above method has a smooth and flat surface, the surface flatness is ≤3%, has a strong metallic luster, and can be continuously produced.

[0076] Comparative Example 1

[0077] The comparative example removes the entry loop 6 and the exit loop 12 on the basis of the example 1, and it is found that the strip straightening cannot be continuously carried out in the production process, mainly because the strip is deformed after the action of the tension leveler 8, and the deformation amount accumulates with the passage of time, which interferes with the tension lifting effect of the tension roller, and then feeds back to the tension leveler, so that the effect of the tension leveler on improving the profile of the strip is reduced. The surface inspection station 14 finds that the surface gloss of the strip is reduced and indentation appears, and the machine needs to be stopped for trimming.

[0078] The above describes the preferred embodiments of the present application, but the present application is not limited to the specific details in the above embodiments, and various simple modifications can be made to the technical solutions of the present application within the technical concept of the present application, and these simple modifications all belong to the protection scope of the present application.

[0079] In addition, it should be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present application will not further describe various possible combinations.

[0080] In addition, various different embodiments of the present application can also be combined in any manner, as long as it does not deviate from the idea of the present application, and it should also be considered as disclosed by the present application.

Claims

1. A continuous production process for straightening a strip steel, characterized in that: The method comprises the following steps: S1, the steel coil is sent to the reel shaft of the uncoiler for uncoiling operation, and after the uncoiling is completed, it is sent to the welding machine area for welding, and then the edge cutting equipment is used for edge cutting in the welding area to obtain a pre-processed strip steel; S2, the pre-processed strip steel is sent into a 1# tension roller, an inlet loop and a 2# tension roller in sequence to obtain a strip steel with primary tension adjustment; the inlet loop is a vertical loop, the distance between the top roller and the bottom fixed roller is 10-15 meters, and both the top loop roller and the bottom fixed roller are driven to keep consistent with the moving speed of the strip steel; S3, the strip steel with primary tension adjustment is sent into a tension leveler to obtain a strip steel with improved flatness; the tension leveler is a wet type tension leveler, which comprises a bending unit and a straightening unit, and the inlet and outlet of the bending unit and the inlet and outlet of the straightening unit are all provided with straightening liquid nozzles for spraying straightening liquid on the upper and lower surfaces of the strip steel; S4, the strip steel with improved flatness is sent into a cleaning device and a drying device in sequence to obtain a bright strip; S5, the bright strip is sent into a 3# tension roller, an outlet loop and a 4# tension roller in sequence to obtain a strip steel with secondary tension adjustment; the outlet loop is a vertical loop, the distance between the top roller and the bottom fixed roller is 10-15 meters, and both the top loop roller and the bottom fixed roller are driven to keep consistent with the moving speed of the strip steel; the 2# tension roller and the 3# tension roller are both 6-roller tension rollers, the roller surface is tungsten carbide, the surface is roughened, the surface roughness is Ra≥3.0 μm, and the roughness skew index Rsk is less than 0; or the roller surface is polyurethane, the surface is roughened, the surface roughness is Ra≥3.0 μm, and the roughness skew index Rsk index is controlled within ±0.8; S6, the strip steel with secondary tension adjustment is sent into a surface inspection station, and after the surface inspection is completed, it is cut by an outlet shearing device and finally wound by a coiler.

2. The continuous production process for straightening a strip steel according to claim 1, characterized in that: The roll diameter of the looper roll of the inlet looper and the outlet looper is 800mm~1000mm, and the roll body rotational inertia is not more than 25 KG×m 2 .

3. The continuous production process for straightening a strip steel according to claim 2, characterized in that: The inlet loop and the outlet loop each comprise 7-9 loop rollers arranged in two rows, so that the strip steel passes through the loop rollers in the shape of a Chinese character, the distance between adjacent loop rollers is 1-2.5 m, and the time for the strip steel to pass through the inlet loop is 6-8 minutes.

4. The continuous process for straightening a strip of steel as claimed in claim 1, wherein: The inlet of the tension leveler is provided with two stabilizing rollers, and the outlet is provided with one stabilizing roller, and the stabilizing rollers are connected with a transmission device, so that the rotating speed of the stabilizing rollers is consistent with the running speed of the strip steel.

5. The continuous production process for straightening a strip steel according to claim 4, characterized in that: The straightening liquid is an acidic solution or lubricating oil.

6. The continuous production process for straightening a strip steel according to claim 5, characterized in that: The spraying angle of the straightening liquid nozzle relative to the strip steel is adjustable.

7. The continuous production process for straightening a strip steel according to any one of claims 4-6, characterized in that: The inlet and outlet of the tension leveler are both provided with tension rollers, the tension rollers are 6-roller tension rollers, the roller body is provided with a scraper, and the roller diameter is 1000-1500 mm.

8. The continuous production process for straightening a strip steel according to claim 7, characterized in that: The bottom of the rack of the tension leveler is provided with a straightening liquid collecting groove, which collects the straightening liquid and returns to the straightening liquid supply tank after being filtered by a filtering unit.

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