Continuous production process for straightening strip steel

Abstract

The invention relates to a continuous production process for straightening strip steel. The continuous production process comprises the following steps: S1, processing to obtain pre-processed strip steel; s2, the pre-machined strip steel is sequentially fed into a 1 # tension roller, an inlet loop and a 2 # tension roller, and strip steel subjected to primary tension adjustment is obtained; s3, the strip steel subjected to primary tension adjustment is fed into a withdrawal and straightening machine, and the strip steel with improved flatness is obtained; s4, the strip steel with the improved flatness is sequentially fed into cleaning equipment and drying equipment, and a bright strip is obtained; s5, the bright belt is sequentially fed into a third tension roller, an outlet loop and a fourth tension roller, and strip steel subjected to secondary tension adjustment is obtained; and S6, the strip steel subjected to secondary tension adjustment is fed into a surface inspection station, enters outlet shear equipment for slitting after surface inspection is completed, and finally enters a coiling machine for coiling. By means of the method, the stainless steel product with the 2B or BA surface can be straightened to improve the model of the stainless steel product, continuous production is achieved, and the product flatness is high.

Description

Technical Field

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

[0002] In the field of stainless steel cold strip production, flattening machines are usually used to solve the stainless steel pattern problem. However, stainless steel flattening machines usually use two rollers for flattening, and the roller diameter is large, so the ability to solve the pattern is relatively weak, especially when the pattern is medium wave, it is difficult to eliminate it with a flattening machine.

[0003] Straightening strip steel with a straightening machine can achieve good results, but there is also a risk of strip steel defects recurring. Such as indentation defects, scratch defects, and parking marks on the surface of the strip steel. Therefore, the straightening machine used for straightening strip steel needs to be able to produce continuously and stably, and strip steel defects cannot be recurred due to poor unit stability.

[0004] Patent application CN115591945A discloses a method for reducing downgraded products by changing the rolls of a skin pass mill in a hot-dip galvanizing production line, comprising the following steps: Step 1: reducing the strip speed of process section 1 and process section 2; Step 2: when the strip weld reaches the exit of the skin pass mill, the strip speed of process section 2 is reduced to 0 m / min; Step 3: replacing the working rolls of the skin pass mill and flushing the replaced working rolls; Step 4: after flushing the working rolls of the skin pass mill, the speed strip of process section 2 starts to run at the minimum strip running speed specified by the skin pass mill, straightening machine and roller coater. When the skin pass mill, straightening machine and roller coater start skin pass, straightening and roller coating, the speed of the strip of process section 2 is gradually increased, and the intermediate looper is released until process section 1 and process section 2 resume normal production speed. This solution uses the function of storing strip steel in the middle loop to make the strip steel in the second process run discontinuously during the roll change process. This is the opportunity to replace the skin pass mill work roll and replace it with a new leveling work roll. After the roll change is completed, the unskinned part is cut off at the exit section flying shear to reduce the production of downgraded products. This method requires synchronous control of multiple nodes, which is difficult to operate, and the frequent shutdown of the second process stage is not conducive to the efficient production of strip steel. Summary of the invention

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

[0006] The specific plan is as follows:

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

[0008] S1. Send the steel coil to the reel shaft of the uncoiler for uncoiling. After uncoilering, send it to the welding area for welding. Then use the digging shear equipment to dig the weld area to obtain pre-processed strip steel.

[0009] S2, feeding the pre-processed strip steel into the 1# tension roller, the entrance looper and the 2# tension roller in sequence to obtain the strip steel with one-time tension adjustment; the entrance looper is a vertical looper, the distance between the top looper roller and the bottom fixed roller is 10 to 15 meters, and the top looper roller and the bottom fixed roller are both driven by belts, so as to keep the same speed as the moving speed of the strip steel;

[0010] S3, sending the strip steel with the primary tension adjustment into a tension leveler to obtain a strip steel with improved flatness; the tension leveler is a wet tension leveler, comprising a bending unit and a straightening unit, and the inlet and outlet of the bending unit, as well as the inlet and outlet of the straightening unit, are both provided with straightening liquid nozzles to spray straightening liquid on the upper surface and the lower surface of the strip steel;

[0011] S4, sending the strip steel with improved flatness to a cleaning device and a drying device in sequence to obtain a bright strip;

[0012] S5, feeding the bright strip into the 3# tension roller, the exit looper and the 4# tension roller in sequence to obtain a strip steel with secondary tension adjustment; the exit looper is a vertical looper, the distance between the top looper roller and the bottom fixed roller is 10 to 15 meters, and the top looper roller and the bottom fixed roller are both driven by belts, so as to keep the same speed as the moving speed of the strip steel;

[0013] S6. The strip steel with secondary tension adjustment is sent to the surface inspection station, and after the surface inspection is completed, it enters the exit shearing device for slitting, and finally enters the coiler for coiling.

[0014] Furthermore, the roller diameter of the inlet looper and the outlet looper is 800 mm to 1000 mm, and the moment of inertia of the roller body does not exceed 25 kg x m 2 .

[0015] Furthermore, the inlet looper and the outlet looper each comprise 7 to 9 looper rollers arranged in two rows, so that the strip passes through the looper rollers in sequence in a "J" shape, the spacing between adjacent looper rollers is 1 to 2.5 m, and the time for the strip to pass through the inlet looper is 6 to 8 minutes.

[0016] Furthermore, 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<0; or the roller surface is polyurethane, the surface is roughened, the surface roughness is: Ra≥3.0μm, and the roughness skew index Rsk is controlled at ±0.8.

[0017] Furthermore, two stabilizing rollers are arranged at the inlet of the straightening machine, and one stabilizing roller is arranged at the outlet, and the stabilizing rollers are connected to a transmission device so that the rotation speed of the stabilizing rollers is consistent with the running speed of the strip steel.

[0018] Furthermore, the straightening fluid is an acidic solution or lubricating oil.

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

[0020] Furthermore, the inlet and outlet of the tensioning and straightening machine are both provided with tension rollers, the tension rollers are 6-roller tension rollers, a scraper is provided on the roller body, and the roller diameter is 1000mm to 1500mm.

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

[0022] Furthermore, a straightening liquid collecting tank is provided at the bottom of the frame of the tension and straightening machine to collect the straightening liquid and return it to the straightening liquid supply tank after filtering by a filtering unit.

[0023] Beneficial effect: The method provided by the present invention improves the stability of the overall operation by setting loopers at the entrance and exit of the straightening machine, ensuring that the strip steel maintains continuous and stable operation in the straightening machine. Among them, the entrance looper is used to store the time for the strip steel to buffer entering the straightening machine for straightening operation, and the exit looper is used to store the time for the strip steel to buffer the exit operation, thereby ensuring continuous production of the unit when each large coil is divided into small coils; the entrance looper and the exit looper cooperate to achieve continuous operation and reduce the straightening machine stop roller mark caused by shutdown.

[0024] Furthermore, the present invention adopts a vertical looper, which can reduce the number of rollers that the strip contacts compared to the horizontal looper, further reduce the area of ​​the strip contacting the looper rollers, and reduce possible scratching.

[0025] Furthermore, in the present application, the surface of the tension roller is made of tungsten carbide material, the surface is roughened, the surface roughness is: Ra≥3.0μm, and the roughness skew index Rsk<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 skew index Rsk is controlled within ±0.8, so as to improve the flatness of the strip surface.

[0026] Finally, the present invention adopts a wet straightening machine to improve the strip steel pattern, and then a cleaning device and a hot air drying device are set up. An inlet tension roller (i.e., 2# tension roller) is set up at the inlet of the straightening machine, and an outlet roller tension roller (i.e., 3# tension roller) is set up at the hot air drying outlet to keep the tension of the strip steel within an appropriate range, improve the stability of operation, and facilitate maintaining continuous production operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solution of the present invention, the accompanying drawings will be briefly introduced below. Obviously, the accompanying drawings in the following description only relate to some embodiments of the present invention, but are not intended to limit the present invention.

[0028] Figure 1 This is a schematic diagram of the device structure provided by an embodiment 1 of the present invention; in the figure: 1# uncoiler 1, 2# uncoiler 2, welding machine 3, digging and shearing equipment 4, 1# tension roller 5, inlet looper 6, 2# tension roller 7, straightening machine 8, cleaning equipment 9, drying equipment 10, 3# tension roller 11, outlet looper 12, 4# tension roller 13, surface inspection station 14, outlet shearing equipment 15, coiler 16. DETAILED DESCRIPTION

[0029] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. If no specific technology or conditions are indicated in the embodiments, the technology or conditions described in the literature in this area or the product specifications are used.

[0030] Flatness: The present invention uses flatness as an indicator to reflect the flatness of the strip. Flatness refers to the degree of deviation of the strip surface within the closest plane, that is, the distance difference between the steel plate surface and a plane. The flatness meter is used to test the strip surface.

[0031] Example 1

[0032] A continuous production process for straightening strip steel, using Figure 1 The main process flow of the stainless steel bright strip continuous straightening unit shown is as follows:

[0033] The coil car is used to send the steel coil on the steel coil saddle to the reel shaft of the 1# uncoiler 1 or 2# uncoiler 2 for uncoiling operation, and the strip head is sent to the entrance shear to cut off the defective part of the strip head. The strip head is then sent to the welding machine 3 area for welding by the feeding clamp roller. After welding, the weld area is dug with the digging shear device 4 to obtain the pre-processed strip steel.

[0034] The present embodiment adopts two uncoilers to facilitate continuous production. The 1# uncoiler and the 2# uncoiler can perform uncoiling operations alternately. When one side is performing normal uncoiling operation, the other side can use a forklift or a crane to load materials, saving downtime for loading, so that the production line can continue to produce efficiently.

[0035] The pre-processed strip steel is fed into the 1# tension roller 5, and the 1# tension roller 5 is used to increase the tension of the strip steel so that it can smoothly enter the entrance looper 6 to ensure that the strip steel maintains continuous and stable operation in the straightening machine 8 afterwards.

[0036] The entrance looper 6 adopts a vertical looper form, and the distance between the top looper roller and the bottom fixed roller is controlled within 15 meters. The top looper roller and the bottom fixed roller are both driven. The roller diameter of the looper roller is controlled within 800mm~1000mm, and the moment of inertia of the roller body does not exceed 25KG×m 2 The surface of the looper roller is lined with tungsten carbide material, the surface is roughened, the surface roughness is Ra ≥ 3.0μm, and the roughness skew index Rsk is controlled at Rsk < 0. The looper volume meets the operation time of 6 minutes at the entrance and exit, and the pull-leveling machine is prevented from stopping as much as possible to ensure stable operation.

[0037] After the strip passes through the entrance looper 6, it enters the 2# tension roller 7. The 2# tension roller 7 is a 6-roller tension roller made of tungsten carbide. 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 when the strip enters the tension roller, and the relative sliding between the tension roller and the strip when the tension roller starts and stops suddenly, thereby improving the flatness of the strip surface. Specifically, the surface of the 2# tension roller 7 is roughened, with a surface roughness of Ra≥3.0μm and a roughness skew index Rsk<0.

[0038] After passing through the 2# tension roller 7, the strip enters the straightening machine 8. The straightening machine 8 is a wet straightening machine. The wet straightening machine is used to improve the strip shape. It can adopt a two-bend one-straightening mode or a two-bend two-straightening mode. Regardless of the mode, two stabilizing rollers are set at the inlet and one stabilizing roller is set at the outlet. All stabilizing rollers are equipped with transmission devices to ensure that the rotation speed of the stabilizing rollers is consistent with the speed of the strip. The inlet and outlet of the bending unit of the straightening machine 8, as well as the inlet and outlet of the straightening unit, are all equipped with straightening liquid nozzles. The straightening liquid nozzles are set on the upper and lower surfaces of the strip. The spray angle of the nozzle relative to the strip is adjustable. The straightening liquid uses an acidic solution, such as dilute sulfuric acid.

[0039] The entrance tension roller and exit tension roller of the tension leveler 8 adopt the form of 6-roller tension rollers, which are all arranged horizontally, and all the tension rollers are driven. The roller diameter of the tension roller is controlled at 1000mm~1500mm, which can meet the production of stainless steel products with a thickness range of 0.05mm~3mm. The roller body of the tension roller is equipped with a scraper to clean the roller surface regularly. The surface of the tension roller is lined with tungsten carbide material, the surface is roughened, and the surface roughness is: Ra≥3.0μm, and the roughness skew index Rsk<0.

[0040] After the strip passes through the straightening machine 8, it passes through the cleaning equipment 9 and the drying equipment 10. The cleaning equipment 9 mainly uses hot water to wash the straightening liquid and the surface of the incoming material brought by the strip from the straightening machine 8, and squeezes it through the squeezing roller so that only or no hot water remains on the surface of the strip.

[0041] The drying equipment 10 dries the steel strip by circulating hot air. A fan installed above or beside the equipment extracts the hot air in the dryer and mixes it with the external air for recycling.

[0042] The dried strip steel then passes through the 3# tension roller 11 and enters the exit looper 12. The exit looper 12 adopts a vertical looper form, and the distance between the top looper roller and the bottom fixed roller is controlled within 15 meters. Both the top looper roller and the bottom fixed roller are belt-driven. The roller diameter of the looper roller is controlled at 800mm~1000mm, and the moment of inertia of the roller body does not exceed 25KG×m 2 The surface of the looper roller is lined with tungsten carbide material, the surface is roughened, the surface roughness is Ra ≥ 3.0μm, and the roughness skew index Rsk is controlled at Rsk less than 0. The looper volume meets the operation time of 6 minutes at the entrance and exit, and the pull-leveling machine is prevented from stopping as much as possible to ensure stable operation.

[0043] The strip passes through the exit looper 12, which is used to store the strip to buffer the exit operation time, thereby ensuring continuous production of the unit when each large coil is divided into small coils; at the same time, it reduces the roller stop mark of the straightening machine caused by shutdown.

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

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

[0046] Example 2

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

[0048] The coil car is used to send the steel coil on the steel coil saddle to the reel shaft of the 1# uncoiler 1 or 2# uncoiler 2 for uncoiling operation, and the strip head is sent to the entrance shear to cut off the defective part of the strip head. The strip head is then sent to the welding machine 3 area for welding by the feeding clamp roller. After welding, the weld area is dug with the digging shear device 4 to obtain the pre-processed strip steel.

[0049] The present embodiment adopts two uncoilers to facilitate continuous production. The 1# uncoiler and the 2# uncoiler can perform uncoiling operations alternately. When one side is performing normal uncoiling operation, the other side can use a forklift or a crane to load materials, saving downtime for loading, so that the production line can continue to produce efficiently.

[0050] The pre-processed strip steel is fed into the 1# tension roller 5, and the 1# tension roller 5 is used to increase the tension of the strip steel so that it can smoothly enter the entrance looper 6 to ensure that the strip steel maintains continuous and stable operation in the straightening machine 8 afterwards.

[0051] The entrance looper 6 adopts a vertical looper form, and the distance between the top looper roller and the bottom fixed roller is controlled within 15 meters. The top looper roller and the bottom fixed roller are both driven. The roller diameter of the looper roller is controlled within 800mm~1000mm, and the moment of inertia of the roller body does not exceed 25KG×m 2 The surface of the looper roller is lined with polyurethane material, with roughened surface and surface roughness: Ra≥3.0μm, and the roughness skew index Rsk index is controlled at ±0.8. The looper volume meets the operation time of 6 minutes at the entrance and exit, avoiding the shutdown of the straightening machine as much as possible to ensure stable operation.

[0052] After the strip passes through the entrance looper 6, it enters the 2# tension roller 7. The 2# tension roller 7 is a 6-roller tension roller made of tungsten carbide. 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 when the strip enters the tension roller, and the relative sliding between the tension roller and the strip when the tension roller starts and stops suddenly, thereby improving the flatness of the strip surface. Specifically, the surface of the 2# tension roller 7 is roughened, with a surface roughness of Ra≥3.0μm and a roughness skew index Rsk<0.

[0053] After passing through the 2# tension roller 7, the strip enters the straightening machine 8. The straightening machine 8 is a wet straightening machine. The wet straightening machine is used to improve the strip shape. It can adopt a two-bend one-straightening mode or a two-bend two-straightening mode. Regardless of the mode, two stabilizing rollers are set at the inlet and one stabilizing roller is set at the outlet. All stabilizing rollers are equipped with transmission devices to ensure that the rotation speed of the stabilizing rollers is consistent with the speed of the strip. The inlet and outlet of the bending unit of the straightening machine 8, as well as the inlet and outlet of the straightening unit, are all equipped with straightening liquid nozzles. The straightening liquid nozzles are set on the upper and lower surfaces of the strip. The spray angle of the nozzle relative to the strip is adjustable, and the straightening liquid uses lubricating oil.

[0054] The entrance tension roller and exit tension roller of the tension leveler 8 adopt the form of 6-roller tension rollers, which are all arranged horizontally, and all the tension rollers are driven. The roller diameter of the tension roller is controlled at 1000mm~1500mm, which can meet the production of stainless steel products with a thickness range of 0.05mm~3mm. The roller body of the tension roller is equipped with a scraper to clean the roller surface regularly. The surface of the tension roller is lined with tungsten carbide material, the surface is roughened, and the surface roughness is: Ra≥3.0μm, and the roughness skew index Rsk<0.

[0055] After the strip passes through the straightening machine 8, it passes through the cleaning equipment 9 and the drying equipment 10. The cleaning equipment 9 mainly uses hot water to wash the straightening liquid and the surface of the incoming material brought by the strip from the straightening machine 8, and squeezes it through the squeezing roller so that only or no hot water remains on the surface of the strip.

[0056] The drying device 10 uses an air knife to blow the surface of the steel strip to ensure that the surface of the steel strip is clean.

[0057] The dried strip steel then passes through the 3# tension roller 11 and enters the exit looper 12. The exit looper 12 adopts a vertical looper form, and the distance between the top looper roller and the bottom fixed roller is controlled within 15 meters. Both the top looper roller and the bottom fixed roller are belt-driven. The roller diameter of the looper roller is controlled at 800mm~1000mm, and the moment of inertia of the roller body does not exceed 25KG×m 2 The surface of the looper roller is lined with polyurethane material, with roughened surface and surface roughness: Ra≥3.0μm, and the roughness skew index Rsk index is controlled at ±0.8. The looper volume meets the operation time of 6 minutes at the entrance and exit, avoiding the shutdown of the straightening machine as much as possible to ensure stable operation.

[0058] The strip passes through the exit looper 12, which is used to store the strip to buffer the exit operation time, thereby ensuring continuous production of the unit when each large coil is divided into small coils; at the same time, it reduces the roller stop mark of the straightening machine caused by shutdown.

[0059] After passing through the exit looper 12, the strip enters the 4# tension roller 13 to increase the tension again for the subsequent winding operation. After the strip with tension is inspected by the surface inspection station 14, it enters the exit shearing device 15 for slitting, and the obtained stainless steel bright strip enters the coiler 16 for winding.

[0060] The stainless steel bright strip processed by the above method has a smooth and flat surface, a surface flatness of ≤4%, a strong metallic luster, and can be produced continuously.

[0061] Example 3

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

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

[0064] The present embodiment adopts two uncoilers to facilitate continuous production. The 1# uncoiler and the 2# uncoiler can perform uncoiling operations alternately. When one side is performing normal uncoiling operation, the other side can use a forklift or a crane to load materials, saving downtime for loading, so that the production line can continue to produce efficiently.

[0065] The pre-processed strip steel is fed into the 1# tension roller 5, and the 1# tension roller 5 is used to increase the tension of the strip steel so that it can smoothly enter the entrance looper 6 to ensure that the strip steel maintains continuous and stable operation in the straightening machine 8 afterwards.

[0066] The entrance looper 6 adopts a vertical looper form, and the distance between the top looper roller and the bottom fixed roller is controlled within 15 meters. The top looper roller and the bottom fixed roller are both driven. The roller diameter of the looper roller is controlled within 800mm~1000mm, and the moment of inertia of the roller body does not exceed 25KG×m 2 The surface of the looper roller is lined with tungsten carbide material, the surface is roughened, the surface roughness is Ra ≥ 3.0μm, and the roughness skew index Rsk is controlled at Rsk < 0. The looper volume meets the operation time of 6 minutes at the entrance and exit, and the pull-leveling machine is prevented from stopping as much as possible to ensure stable operation.

[0067] After the strip passes through the entrance looper 6, it enters the 2# tension roller 7. The 2# tension roller 7 is a 6-roller tension roller made of tungsten carbide. 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 when the strip enters the tension roller, and the relative sliding between the tension roller and the strip when the tension roller starts and stops suddenly, thereby improving the flatness of the strip surface. Specifically, the surface of the 2# tension roller 7 is roughened, with a surface roughness of Ra≥3.0μm and a roughness skew index Rsk<0.

[0068] After passing through the 2# tension roller 7, the strip enters the straightening machine 8. The straightening machine 8 is a wet straightening machine. The wet straightening machine is used to improve the strip shape. It can adopt a two-bend one-straightening mode or a two-bend two-straightening mode. Regardless of the mode, two stabilizing rollers are set at the inlet and one stabilizing roller is set at the outlet. All stabilizing rollers are equipped with transmission devices to ensure that the rotation speed of the stabilizing rollers is consistent with the speed of the strip. The inlet and outlet of the bending unit of the straightening machine 8, as well as the inlet and outlet of the straightening unit, are all provided with straightening liquid nozzles. The straightening liquid nozzles are set on the upper and lower surfaces of the strip. The spray angle of the nozzle relative to the strip is adjustable. The straightening liquid uses an acidic solution, such as dilute sulfuric acid. The straightening machine 8 collects the straightening liquid through the collection tank at the bottom of the frame and returns it to the straightening liquid supply tank after filtering through the filter unit for recycling.

[0069] The entrance tension roller and exit tension roller of the tension leveler 8 adopt the form of 6-roller tension rollers, which are all arranged horizontally, and all the tension rollers are driven. The roller diameter of the tension roller is controlled at 1000mm~1500mm, which can meet the production of stainless steel products with a thickness range of 0.05mm~3mm. The roller body of the tension roller is equipped with a scraper to clean the roller surface regularly. The surface of the tension roller is lined with tungsten carbide material, the surface is roughened, and the surface roughness is: Ra≥3.0μm, and the roughness skew index Rsk<0.

[0070] After the strip passes through the straightening machine 8, it passes through the cleaning equipment 9 and the drying equipment 10. The cleaning equipment 9 mainly uses hot water to wash the straightening liquid and the surface of the incoming material brought by the strip from the straightening machine 8, and squeezes it through the squeezing roller so that only or no hot water remains on the surface of the strip.

[0071] The drying device 10 uses an air knife to blow the surface of the steel strip until there is no moisture and impurities, revealing a smooth surface.

[0072] The dried strip steel then passes through the 3# tension roller 11 and enters the exit looper 12. The exit looper 12 adopts a vertical looper form, and the distance between the top looper roller and the bottom fixed roller is controlled within 15 meters. Both the top looper roller and the bottom fixed roller are belt-driven. The roller diameter of the looper roller is controlled at 800mm~1000mm, and the moment of inertia of the roller body does not exceed 25KG×m 2 The surface of the looper roller is lined with polyurethane material, with roughened surface and surface roughness: Ra≥3.0μm, and the roughness skew index Rsk index is controlled at ±0.8. The looper volume meets the operation time of 6 minutes at the entrance and exit, avoiding the shutdown of the straightening machine as much as possible to ensure stable operation.

[0073] The strip passes through the exit looper 12, which is used to store the strip to buffer the exit operation time, thereby ensuring continuous production of the unit when each large coil is divided into small coils; at the same time, it reduces the roller stop mark of the straightening machine caused by shutdown.

[0074] After passing through the exit looper 12, the strip enters the 4# tension roller 13 to increase the tension again for the subsequent winding operation. After the strip with tension is inspected by the surface inspection station 14, it enters the exit shearing device 15 for slitting, and the obtained stainless steel bright strip enters the coiler 16 for winding.

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

[0076] Comparative Example 1

[0077] In this comparative example, the entrance looper 6 and the exit looper 12 are removed on the basis of Example 1. It is found that the strip straightening cannot be carried out continuously during the production process. This is mainly because the strip is deformed after the tension straightening machine 8 is applied. As time goes by, this deformation accumulates, interfering with the tension-enhancing effect of the tension roller, which is then fed back to the tension straightening machine, reducing its effect of improving the strip shape. The surface inspection station 14 found that the surface gloss of the strip decreased and indentations appeared, requiring shutdown and trimming.

[0078] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

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

[0080] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A continuous production process for straightening strip steel, characterized in that: The following steps are involved: S1. Send the steel coil to the reel shaft of the uncoiler for uncoil operation. After uncoil completion, send it to the welding area for welding. Then use the digging shear equipment to dig the weld area to obtain the pre-processed strip steel. S2, feeding the pre-processed strip steel into the 1# tension roller, the entrance looper and the 2# tension roller in sequence to obtain the strip steel with one-time tension adjustment; the entrance looper is a vertical looper, the distance between the top looper roller and the bottom fixed roller is 10 to 15 meters, and the top looper roller and the bottom fixed roller are both driven by belts, so as to keep the same speed as the moving speed of the strip steel; S3, sending the strip steel with the primary tension adjustment into a tension leveler to obtain a strip steel with improved flatness; the tension leveler is a wet tension leveler, comprising a bending unit and a straightening unit, and the inlet and outlet of the bending unit, as well as the inlet and outlet of the straightening unit, are both provided with straightening liquid nozzles to spray straightening liquid on the upper surface and the lower surface of the strip steel; S4, sending the strip steel with improved flatness to a cleaning device and a drying device in sequence to obtain a bright strip; S5, feeding the bright strip into the 3# tension roller, the exit looper and the 4# tension roller in sequence to obtain a strip steel with secondary tension adjustment; the exit looper is a vertical looper, the distance between the top looper roller and the bottom fixed roller is 10 to 15 meters, and the top looper roller and the bottom fixed roller are both driven by belts, so as to keep the same speed as the moving speed of the strip steel; S6. The strip steel with secondary tension adjustment is sent to the surface inspection station, and after the surface inspection is completed, it enters the exit shearing device for slitting, and finally enters the coiler for coiling.

2. The continuous production process of straightened strip steel according to claim 1, characterized in that: The roller diameter of the inlet looper and the outlet looper is 800mm-1000mm, and the moment of inertia of the roller body does not exceed 25KG×m 2 .

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

4. The continuous production process of straightened strip steel according to claim 1, characterized in that: 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<0; or the roller surface is polyurethane, the surface is roughened, the surface roughness is: Ra≥3.0μm, and the roughness skew index Rsk is controlled at ±0.

8.

5. The continuous production process of straightened strip steel according to claim 1, characterized in that: Two stabilizing rollers are arranged at the inlet of the straightening machine, and one stabilizing roller is arranged at the outlet. The stabilizing rollers are connected to a transmission device so that the rotation speed of the stabilizing rollers is consistent with the running speed of the strip steel.

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

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

8. The continuous production process of straightened steel strip according to any one of claims 5 to 7, characterized in that: The inlet and outlet of the tensioning and straightening machine are both provided with tension rollers, the tension rollers are 6-roller tension rollers, the roller bodies are provided with scrapers, and the roller diameters are 1000mm to 1500mm.

9. The continuous production process for straightening steel strip according to claim 8, characterized in that: The roller surface of the tension roller is tungsten carbide, the surface is roughened, the surface roughness is: Ra≥3.0μm, and the roughness skew index Rsk<0; or the roller surface is polyurethane, the surface is roughened, the surface roughness is: Ra≥3.0μm, and the roughness skew index Rsk is controlled within ±0.

8.

10. The continuous production process of straightened steel strip according to claim 8, characterized in that: A straightening liquid collecting tank is arranged at the bottom of the frame of the tension and straightening machine, and the straightening liquid is collected and returned to the straightening liquid supply tank after being filtered by the filtering unit.

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