Multi-stage treatment method for residual dirty marks on surface of wide-band stainless steel strip

Abstract

The invention discloses a multi-stage treatment method for residual dirt marks on the surface of a wide-band stainless steel strip, which comprises the following steps: S1, pickling and soaking treatment: soaking the steel strip in cooperation with the bottom of a pickling area through a guide assembly, S2, pickling and cleaning treatment: moving and transporting the steel strip to a position between two groups of pickling and brushing assemblies which are arranged at the upper end of the pickling area and are opposite up and down through the guide assembly, a driving motor arranged on a cleaning brush assembly drives a gear arranged at the lower end, the gear drives half gear brushes arranged on the two sides to rotate, the surface of the steel belt is cleaned in a reciprocating mode, and then a water spraying pipe arranged on the cleaning brush assembly is matched for spraying cleaning water and rinsing the steel belt with clean water; the water absorption assemblies are arranged at the upper end and the lower end of the drying area, air is blown through the air outlet rollers arranged on the two sides of the surrounding belt, the water absorption type surrounding belt completely absorbs water on the surface of the steel belt, the water on the water absorption type surrounding belt is reduced, dirt marks are reduced, and the quality of the steel belt is guaranteed.

Description

Technical Field

[0001] The invention belongs to the stainless steel pickling technology, and in particular relates to a multi-stage treatment method for residual dirty marks on the surface of a wide-band stainless steel strip. Background Art

[0002] During the rolling process, a certain amount of oxide scale will be produced on the surface of the stainless steel strip, which requires pickling. After pickling and cooling, water stains and acid liquid will remain on the surface, which is easy to produce dirty marks and affect the surface quality of the steel strip. Therefore, it is necessary to clean the residual water stains on the surface in time.

[0003] After searching, it is found in the prior art that there is a high-efficiency pickling device for strip processing with a publication number of CN218146970U. When the strip passes through the opening in the middle of the partition, the rough roller can roll against the surface of the strip to scrape off the residual water stains and unfallen oxides on the surface of the strip. Before the strip moves to the outlet, it will pass through the inside of the blowing pipe, and air will be pumped into the blowing pipe by a blower to make the blowing nozzle dry the water stains on the surface of the strip. There is a problem with the above scheme: when the water stains on the steel strip are dried by the blowing pipe in combination with the blowing nozzle, larger water droplets will dry more slowly, and the water droplets will slide down along the wind direction to produce water marks, resulting in the need for secondary treatment.

[0004] After searching, it was found that a stainless steel wide panel dirty print pickling device and its pickling process with a publication number of CN117089853A in the prior art had the following problems during the pickling process: during the operation of the water-absorbing roller, the motor Ⅰ arranged at the output end of the motor Ⅰ engages with the guide groove, and drives the sliding plate to reciprocate as a whole to squeeze out the residual water in the water-absorbing roller; in actual use, the pressure resistance of the water-absorbing roller decreases after long-term use, and it is very easy to cause tearing after being squeezed by the arc-shaped squeezing plate. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a multi-stage treatment method for residual dirty marks on the surface of a wide stainless steel strip. The steel strip enters the pickling area for pickling and soaking, and then enters the pickling brush assembly and the cleaning brush assembly to quickly treat the surface of the steel strip. Through the water absorption assembly, the water-absorbing surround belt wipes the surface of the steel strip to quickly drain and absorb water droplets. At the same time, in order to prevent the water-absorbing surround belt from being saturated with water, corresponding water absorption ports and air outlet rollers are provided on the front and back sides, one side blows air and the other side absorbs air, so as to accelerate the airflow to drive the water stains inside the water-absorbing surround belt to be removed. In order to accelerate the evaporation rate of the water stains, a heating wire is provided on the blower to generate high-temperature gas, accelerate the evaporation of the gas, and ensure the water absorption performance of the water absorption assembly.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A multi-stage treatment method for residual dirty marks on the surface of a wide stainless steel strip, wherein the inner side of a shell is divided into three areas by two partitions, namely, a pickling area, a clean water rinsing area, and a drying area. The steel strip is first sent forward through a guide assembly into the pickling area, the clean water rinsing area, and the drying area, and comprises the following steps:

[0008] S1: Confirm the nitric acid concentration, hydrogen fluoride concentration, metal ion concentration and acid temperature in the acid zone, and pickle the steel strip through the first mixed acid and second mixed acid, and soak it in the bottom of the pickling zone through the guide assembly;

[0009] S2: The steel strip is moved and transported to the two groups of upper and lower opposing pickling brush assemblies provided at the upper end of the pickling area through the guide assembly for pickling. The double-threaded column provided on the pickling brush assembly rotates, and a cleaning mechanism is provided on the double-threaded column. The cleaning mechanism is guided to reciprocate through the double-threaded grooves on the double-threaded column. At the same time, the inner and outer brush heads on the cleaning mechanism rotate forward and reverse, and the acid is sprayed in coordination with the water spray port provided on the cleaning mechanism. The brush head speed is set at 4800-7000rpm. The same part of the steel strip is cleaned for 2-3 minutes. After cleaning, the steel strip moves to the next process intermittently;

[0010] S3: When the steel strip passes through the pickling area and enters the clean water rinsing area, the steel strip first passes through the squeeze roller at the tail end of the pickling area to squeeze the acid to reduce the excessive acid entering the clean water rinsing area. The steel strip moves to the cleaning brush assembly, and the driving motor provided by the cleaning brush assembly drives the gear provided at the lower end. The gear drives the half-gear brushes provided on both sides to rotate. The half-gear brushes are engaged with the teeth on both sides of the rack through the half-gear provided at the upper end. The lower gear is driven by the driving motor to rotate, and the lower gear drives the half-gear brushes on both sides to rotate in the opposite direction to realize forward and backward movement. Reciprocating motion, reciprocating cleaning of the steel belt surface, and then cooperating with the water spray pipe provided on the cleaning brush assembly to spray cleaning water, which is sprayed onto the steel belt through the water spray port provided at the lower end of the half-gear brush, and the steel belt is rinsed with clean water. The driving motor drives the half-gear brushes on both sides to reciprocate. At the same time, the speed of the half-gear brush is 1000-1500rpm, and the same part of the steel belt is cleaned for 1-2 minutes. The steel belt continues to move forward, enters the bottom of the clean water rinsing area, contacts with water over a large area, and is washed and soaked, and then enters the cleaning brush assembly on the other side for secondary cleaning;

[0011] S4: After washing and cleaning, when the steel belt passes through the tail end of the clean water rinsing area, another squeezing roller squeezes the surface of the steel belt, and the steel belt enters the drying area. The upper and lower ends of the drying area are provided with water absorption components. The steel belt passes through the water absorption component to remove surface moisture, and the steel belt moves between two opposite water absorption components. The rotating motor provided on the water absorption component is started to drive the air outlet roller and the driven roller on the water absorption component to rotate, and the roller drives the water absorption type surrounding belt provided on the outside to rotate, so as to absorb water stains on the surface of the steel belt. At the same time, the blower connected to the pipe on one side of the air outlet roller heats the gas through the heating wire provided inside the blower, blows air through the air outlet rollers provided on both sides of the surrounding belt, and then connects to the water suction port of the vacuum pump through the pipe on the outside of the surrounding belt, so that the water absorption type surrounding belt can absorb the moisture on the surface of the steel belt and reduce the moisture on the water absorption type surrounding belt itself.

[0012] Preferably, in step S1, the first-stage pickling: the nitric acid concentration is 55g / L-70g / L, the hydrogen fluoride concentration is 15g / L-20g / L, the metal ion is 30g / L-39g / L, and the temperature is 55-65°C; the second-stage pickling: the nitric acid concentration is 70g / L-100g / L, the hydrogen fluoride concentration is 20g / L-30g / L, and the metal ion is 20g / L-30g / L.

[0013] Preferably, the guide assembly includes a conveying roller and a guide plate I. A V-shaped guide plate I is installed between the inner walls of both sides of the shell. A conveying roller is provided at the opening of the V-shaped guide plate I. Both sides of the conveying roller are connected to the shell through shafts. One side of the conveying roller is driven and connected to a rotating motor, and the rotating motor drives the remaining conveying rollers to rotate through a conveyor belt.

[0014] Preferably, the pickling brush assembly includes a lifting motor, which is correspondingly installed on both sides of the upper and lower ends of the shell, and an L-shaped plate is correspondingly installed on the lifting motor, and a double-threaded column is axially connected between the upper and lower L-shaped plates, a rotating motor is provided on one side of the double-threaded column, and a guide rod is provided on one side of the double-threaded column, a connecting frame is slidably connected to the guide rod, a rotatable steering block is provided on the connecting frame, a guide column is provided at the lower end of the steering block, the guide column is slidably fitted in the thread of the double-threaded column, and a cleaning mechanism is provided at the lower end of the connecting frame.

[0015] Preferably, the cleaning mechanism includes an axial connection tube, a axial connection tube is installed at the lower end of the connecting frame, the upper end of the axial connection tube is connected to the liquid inlet pipe, the lower end of the axial connection tube is rotatably connected to the connecting tube, a gear is provided on the connecting tube, the gear is meshed with another gear on one side, the other gear is driven by a rotating motor, the rotating motor is installed on the connecting frame, an inner brush head is provided at the lower end of the connecting tube, an outer brush head is rotatably connected to the outer side of the inner brush head, a water outlet is provided at the lower end of the inner brush head, the water outlet is matched with the middle cavity of the inner brush head, water outlet holes are provided at the lower ends of the inner and outer brush heads, a gear ring is provided at the upper end of the outer brush head, the gear ring is meshed with a bevel gear, and the bevel gear is connected to the gear at the lower end of the rotating motor through a rotating shaft.

[0016] Preferably, two groups of cleaning brush assemblies are provided on both sides of the clean water rinsing area, and each group of cleaning brush assemblies is arranged on the front and back sides of the steel belt. The cleaning brush assembly includes mounting plates, which are mounted on the inner walls of the shell on both sides. Racks are arranged between the mounting plates, and the racks are meshed with half gears on the half gear brushes on both sides through teeth on both sides. Gears are arranged at the lower ends of the half gears, and other gears are meshed and connected between the gears on both sides. A driving motor is connected to the upper ends of the other gears, and the driving motor is slidably mounted on a slot provided in the middle of the rack. Guide rails are provided on both sides of the slot for limiting the rotation of the driving motor so that the rotating motor can better drive the lower end gear to rotate. A guide plate II is also provided between the mounting plates for supporting and guiding the gears on the half gear brush and the rotating motor. The upper end of the half gear brush is axially connected to the water outlet of the water spray pipe, and the lower end of the half gear brush is provided with a water outlet and a brush head. The middle support column of the half gear brush is hollow inside and is used to connect the water spray pipe and the water outlet of the water spray hole.

[0017] Preferably, the water absorption component includes a lifting plate, a blowing device and a blower. Slots are provided on both sides of the shell, and screw rods and guide columns are provided in the slots. The upper end of the screw rod is connected to a rotating motor, and a lifting plate is cooperated with the screw rod and the guide column. A bracket is connected between the lifting plates, and an air outlet roller is rotatably installed on the bracket. The air outlet roller is provided with an air outlet. A pipe on one side of the air outlet roller is connected to the blowing device. The blowing device consists of a connecting pipe and a blower. The blower bracket is installed on the outside of the lifting plate. A heating wire is also provided inside the blower to assist in the discharge of hot air. A driven roller is provided between the air outlet rollers on both sides. A water-absorbing wrapping belt is cooperated on the air outlet roller and the driven roller, and a water suction port is cooperated on the outside of the water-absorbing wrapping belt. The water-absorbing wrapping belt is industrial water-absorbing cotton arranged in a wrapping manner, and PP water-absorbing cotton material is preferably used.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1) A pickling brush assembly is provided, and the lifting motor is used to ensure that the inner and outer brush heads are in contact with the surface of the steel strip. At the same time, the rotating motor drives the double-threaded column to rotate unidirectionally. The steering block at the lower end of the connecting frame quickly reciprocates in the thread groove of the double-threaded column to realize the reciprocating motion of the brush. At the same time, the rotating motor drives the inner and outer brush heads to rotate forward and reverse through gears, and the reciprocating motion cleans the surface of the steel strip to prevent dead corners. At the same time, the inner and outer brush heads cooperate with the reciprocating motion to increase the cleaning effect. At the same time, the water outlet at the lower end of the inner and outer brush nozzles increases the effect of the acid on the surface of the steel strip, and assists in cleaning dirty marks.

[0020] 2) Prevent the acid from entering the clean water rinsing area in large quantities through the squeeze roller, then start the cleaning brush assembly to clean the acid on both sides of the steel strip to prevent the acid from staying on the surface of the steel strip for too long and affecting the surface quality of the steel strip. Notify the lower end brush head of the half-gear brush to assist in cleaning the surface of the steel strip again to increase the cleanliness level. The half-gears on both sides are engaged with the rack to achieve reciprocating motion of the half-gear brush.

[0021] 3) The water stains on the surface of the steel belt are cleaned by the water-absorbing component water-absorbing wrapping belt, and the traditional water-absorbing roller is replaced by the water-absorbing wrapping belt. At the same time, the water-absorbing effect of the water-absorbing wrapping belt is prevented from being deteriorated. The blower with a built-in heating wire blows air to the air outlet roller to accelerate the air flow on the surface of the transmission belt and increase the water absorption effect of the water-absorbing wrapping belt. The water absorption port and the vacuum pump are connected to remove water stains and moisture on the surface of the water-absorbing wrapping belt to help increase the water absorption effect of the water-absorbing wrapping belt. Compared with the traditional extrusion water-absorbing roller, this method reduces the equipment maintenance rate and increases the service life. At the same time, the water absorption effect of the water-absorbing roller is retained, and a new method for removing moisture inside the water-absorbing material is adopted. At the same time, the water-absorbing wrapping belt is widened and the contact area with the steel belt is increased to increase the water absorption effect. The present invention can work in a cycle, and the water absorption process does not affect the operation of the water-absorbing wrapping belt. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Attached Figure 1 It is a structural schematic diagram of a multi-stage treatment method for residual dirty marks on the surface of a wide-band stainless steel strip according to the present invention;

[0023] Attached Figure 2 It is a schematic diagram of the structure of the pickling brush assembly of the present invention;

[0024] Attached Figure 3 It is a schematic diagram of the structure of the pickling brush assembly of the present invention;

[0025] Attached Figure 4 It is a schematic diagram of the double-thread column structure of the present invention;

[0026] Attached Figure 5 It is a schematic diagram of the structure of the cleaning brush assembly of the present invention;

[0027] Attached Figure 6 It is a schematic diagram of the structure of the water absorption component of the present invention;

[0028] Attached Figure 7 It is a schematic diagram of the structure of the water absorption component of the present invention;

[0029] Attached Figure 8 It is a schematic diagram of the three-dimensional structure of the present invention.

[0030] In the figure: 1. guide assembly; 101. conveying roller; 102. guide plate I; 2. shell; 21. squeeze roller; 3. pickling brush assembly; 31. L-shaped plate; 32. guide rod; 33. connecting frame; 34. steering block; 35. double threaded column; 36. lifting motor; 37. cleaning mechanism; 371. shaft connection cylinder; 372. connecting cylinder; 373. outer brush head; 374. inner brush head; 375. liquid inlet pipe; 4. cleaning brush assembly; 41. water spray pipe; 42. guide plate II; 45. half gear brush; 46. driving motor; 47. mounting plate; 48. rack; 5. water absorption assembly; 51. lifting plate; 52. water absorption port; 53. blowing equipment; 54. water absorption type wrap-around belt; 55. blower; 56. air outlet roller; 6. steel belt; 7. partition. DETAILED DESCRIPTION

[0031] The present disclosure is described in detail below in conjunction with the various embodiments shown in the accompanying drawings, but it should be noted that these embodiments are not limitations of the present disclosure, and any equivalent transformations or substitutions in functions, methods, or structures made by ordinary technicians in the field based on these embodiments are all within the scope of protection of the present disclosure.

[0032] To facilitate the understanding of those skilled in the art, Figure 1-8 , the technical solution of the present invention is further specifically described.

[0033] Implementation 1:

[0034] A multi-stage treatment method for residual dirty marks on the surface of a wide stainless steel strip comprises the following steps: S1, the internal atmosphere of a shell 2 is divided into three areas through two partitions 7, namely, a pickling area, a clean water rinsing area, and a drying area, and the steel strip 6 is first sent forward through a guide assembly 1 into the pickling area, the clean water rinsing area, the drying area, and the dirty mark treatment process is as follows:

[0035] S1: Pickling and soaking treatment: The steel strip 6 is soaked in the bottom of the pickling zone through the guide assembly 1. The acid solution is mixed acid stage 1 and mixed acid stage 2. The concentration of nitric acid in the mixed acid stage 1 is 62g / L, the concentration of hydrogen fluoride is 18g / L, the metal ion is 34g / L, and the temperature is 60°C. The concentration of nitric acid in the mixed acid stage 2 is 85g / L, the concentration of hydrogen fluoride is 25g / L, and the metal ion is 25g / L.

[0036] S2: Pickling and cleaning treatment: The steel strip 6 is moved and transported to between two groups of upper and lower opposing pickling brush assemblies 3 provided at the upper end of the pickling zone through the guide assembly 1 for pickling. The double threaded column 35 provided on the pickling brush assembly 3 rotates, and the double threaded column 35 is provided with a cleaning mechanism 37. The double threaded groove on the double threaded column 35 guides the cleaning mechanism 37 to reciprocate. At the same time, the inner and outer brush heads on the cleaning mechanism 37 rotate forward and reverse, and the acid is sprayed in coordination with the water spray port provided on the cleaning mechanism 37. At this time, the brush head speed is set at 4800-7000rpm, and the same part of the steel strip is cleaned for 2-3 minutes. After cleaning, the steel strip moves to the next process intermittently;

[0037] S3: Water washing and cleaning treatment: When the steel strip 6 passes through the pickling area and enters the clean water rinsing area, the steel strip 6 first passes through the squeeze roller 21 provided at the tail end of the pickling area to squeeze the acid to reduce excessive acid entering the clean water rinsing area. The steel strip 6 moves to the cleaning brush assembly 4, and the driving motor 46 provided at the cleaning brush assembly 4 drives the gear provided at the lower end, and the gear drives the half gear brushes 45 provided on both sides to rotate. The half gear brush 45 is meshed with the teeth on both sides of the rack 48 through the half gear provided at the upper end, and the lower end gear is driven to rotate by the driving motor 46, and the lower end gear drives the half gear brushes 45 on both sides to rotate. The steel belt 6 is cleaned by rotating to realize reciprocating motion, and the surface of the steel belt 6 is cleaned reciprocatingly, and then the cleaning water is sprayed by the water spray pipe 41 provided on the cleaning brush assembly 4, and sprayed onto the steel belt 6 through the water spray port provided at the lower end of the half gear brush 45, and the steel belt 6 is rinsed with clean water. The driving motor 46 drives the half gear brushes 45 on both sides to reciprocate. At the same time, the speed of the half gear brush 45 is 1000-1500rpm, and the same part of the steel belt is cleaned for 1-2 minutes. The steel belt continues to move forward, enters the bottom of the clean water rinsing area, contacts with water over a large area, and is washed and soaked, and then enters the cleaning brush assembly 4 on the other side for secondary cleaning;

[0038] S4: Dehydration treatment: After washing and cleaning, when the steel belt 6 passes through the tail end of the clean water rinsing area, another squeezing roller 21 squeezes the surface of the steel belt 6, and the steel belt 6 enters the drying area. The upper and lower ends of the drying area are provided with a water absorption component 5. The steel belt 6 passes through the water absorption component 5 to remove surface moisture, and the steel belt 6 moves between two opposite water absorption components 5. The rotating motor provided on the water absorption component 5 is started to drive the air outlet roller 56 and the driven roller on the water absorption component 5 to rotate, and the roller drives the water absorption type surrounding belt 54 provided on the outside to rotate, so as to absorb water stains on the surface of the steel belt 6. At the same time, the blower 55 connected to the pipe on one side of the air outlet roller 56 is heated by the heating wire provided inside the blower 55, and air is blown through the air outlet rollers 56 provided on both sides of the water absorption type surrounding belt 54, and then connected to the water suction port 52 of the vacuum pump through the outer pipe of the water absorption type surrounding belt 54, so that the water absorption type surrounding belt 54 can absorb the moisture on the surface of the steel belt 6 and reduce the moisture on the water absorption type surrounding belt 54 itself.

[0039] The guide assembly 1 includes a conveying roller 101 and a guide plate I102. A V-shaped guide plate I102 is installed between the inner walls of the shell 2. A conveying roller 101 is provided at the opening of the V-shaped guide plate I102. Both sides of the conveying roller 101 are connected to the shell 2 through an axis. One side of the conveying roller 101 is driven and connected to a rotating motor, and the rotating motor drives the remaining conveying rollers 101 to rotate through a conveyor belt.

[0040] Combination Figure 2 and Figure 3 The pickling brush assembly 3 includes a lifting motor 36, which is correspondingly installed on the upper and lower ends of the shell 2. An L-shaped plate 31 is correspondingly installed on the lifting motor 36. A double-threaded column 35 is axially connected between the upper and lower L-shaped plates 31. A rotating motor is provided on one side of the double-threaded column 35. A guide rod 32 is provided on one side of the double-threaded column 35. A connecting frame 33 is slidably connected to the guide rod 32. A rotatable steering block 34 is provided on the connecting frame 33. A guide column is provided at the lower end of the steering block 34. The guide column is slidably fitted in the thread of the double-threaded column 35. A cleaning mechanism 37 is provided at the lower end of the connecting frame 33.

[0041] Combination Figure 3 As shown, the cleaning mechanism 37 includes an axial connection tube 371, and the lower end of the connecting frame 33 is equipped with an axial connection tube 371. The upper end pipeline of the axial connection tube 371 is connected to the liquid inlet pipe 375. The lower end of the axial connection tube 371 is rotatably connected to the connecting tube 372. The connecting tube 372 is provided with a gear, and the gear is meshed with another gear on one side. The other gear is driven by a rotating motor, and the rotating motor is installed on the connecting frame 33. The lower end of the connecting tube 372 is provided with an inner brush head 374, and the outer side of the inner brush head 374 is rotatably connected to the outer brush head 373. The lower end of the inner brush head 374 is provided with a water outlet, and the water outlet cooperates with the middle cavity of the inner brush head 374. The lower ends of the inner brush head 374 and the outer brush head 373 are both provided with water outlet holes. The upper end of the outer brush head 373 is provided with a gear ring, and the gear ring is meshed with a bevel gear. The bevel gear is connected to the gear at the lower end of the rotating motor through a rotating shaft.

[0042] Combination Figure 5As shown, two groups of cleaning brush assemblies 4 are provided on both sides of the clean water rinsing area, and each group of cleaning brush assemblies 4 is arranged on the front and back sides of the steel belt 6. The cleaning brush assembly 4 includes a mounting plate 47, and the mounting plate 47 is installed on the inner walls of both sides of the housing 2. A rack 48 is provided between the mounting plates 47. The rack 48 is meshed with the half gears on the half gear brushes 45 on both sides through the teeth on both sides. The lower end of the half gear is provided with a gear, and another gear is meshed and connected between the gears on both sides. The upper end of the other gear is connected to a drive motor 46, and the drive motor 4 6 is slidably mounted on a slot in the middle of the rack 48, and guide rails are provided on both sides of the slot to limit the rotation of the driving motor 46 so that the rotating motor can better drive the lower gear to rotate. A guide plate II 42 is also provided between the mounting plates 47 to support and guide the half gear brush 45 and the gear on the rotating motor. The upper end of the half gear brush 45 is axially connected to the water outlet of the water spray pipe 41, and the lower end of the half gear brush 45 is provided with a water outlet and a brush head. The middle support column of the half gear brush 45 is hollow inside and is used to connect the water spray pipe 41 and the water outlet of the water spray hole.

[0043] Combination Figure 6 and Figure 7 As shown, the water absorption component 5 includes a lifting plate 51, a blowing device 53 and a blower 55. Slots are provided on both sides of the shell 2. Screws and guide columns are provided in the slots. The upper end of the screw is connected to a rotating motor. The lifting plate 51 is provided on the screw and the guide column. A bracket is connected between the lifting plates 51. An air outlet roller 56 is rotatably installed on the bracket. The air outlet roller 56 is provided with an air outlet. A pipe on one side of the air outlet roller 56 is connected to the blowing device 53. The blowing device 53 consists of a connecting pipe and a blower 55. The blower 55 bracket is installed outside the lifting plate 51. On the other side, a heating wire is also provided inside the blower 55 to assist in the discharge of hot air. A driven roller is provided between the air outlet rollers 56 on both sides. The air outlet rollers 56 and the driven rollers are cooperated with a water-absorbing surrounding belt 54. The water-absorbing surrounding belt 54 is a surrounding industrial absorbent cotton, preferably PP absorbent cotton material (PP absorbent cotton is an industrial absorbent material made of polypropylene material, which has good corrosion resistance, antibacterial resistance and water absorption performance. In addition, PP absorbent cotton also has good pressure resistance, antistatic property, wear resistance and other properties, and is suitable for various industrial fields).

[0044] A water suction port 52 is provided on the outer side of the water-absorbing surrounding belt 54 .

[0045] Embodiment 2:

[0046] The difference from Example 1 is that:

[0047] S1: Pickling and soaking treatment: The steel strip 6 is soaked in the bottom of the pickling zone through the guide assembly 1, mixed acid stage 1 and mixed acid stage 2. The concentration of nitric acid in the mixed acid stage 1 is 56 g / L, the concentration of hydrogen fluoride is 16 g / L, the metal ion is 32 g / L, and the temperature is 56°C. The concentration of nitric acid in the mixed acid stage 2 is 71 g / L, the concentration of hydrogen fluoride is 21 g / L, and the metal ion is 21 g / L.

[0048] Embodiment 3:

[0049] The difference from Example 1 is that:

[0050] S1: Pickling and immersion treatment: The steel strip 6 is immersed in the bottom of the pickling zone through the guide component 1, mixed acid stage one and mixed acid stage two. The nitric acid concentration of the mixed acid stage one is 70g / L, the hydrogen fluoride concentration is 20g / L, the metal ion concentration is 39g / L, and the temperature is 65°C. The nitric acid concentration of the mixed acid stage two is 100g / L, the hydrogen fluoride concentration is 30g / L, and the metal ion concentration is 30g / L.

[0051] Through the above-mentioned embodiments 1, 2 and 3, visually check whether there is any dirt mark on the surface of the steel strip 6;

[0052] The surface of Example 1 is visually smooth and has no defects, with slight dirt marks in some parts.

[0053] The surface of Example 2 was visually smooth and without defects, and no local dirt marks were found.

[0054] Example 3 Visual observation shows that the surface acid concentration is too high, resulting in slight holes in the steel strip, a rough surface, and a small amount of acid remaining in the pits.

[0055] In summary, the steel strip is soaked in acid through the guide component 1, which is convenient for the next step to remove quality problems such as dirty marks. The cleaning mechanism 37 on the pickling brush component 3 cleans and removes impurities on the surface of the steel strip, and cooperates with the inner and outer brushes to increase the cleaning force. Through the water outlet holes at the lower ends of the inner brush head 374 and the outer brush head 373, the brush head cooperates with the acid when working, and the inner and outer brush heads rotate forward and reversely to increase the cleaning effect. The double threaded column 35 is driven by a rotating motor, and the steering block 34 moves on the threaded groove to achieve reciprocating motion, thereby increasing the lateral and comprehensive cleaning of the steel strip 6 to prevent dead corners.

[0056] After the pickling treatment, the acid liquid on the surface of the steel strip 6 is cleaned again by the cleaning brush assembly 4 to prevent the acid liquid from remaining on the steel strip 6 for too long and damaging the surface of the steel strip, causing pits and affecting the quality of the steel strip 6. The steel strip 6 is connected to the water spray pipe 41 through an external water outlet pump (not shown in the figure). The water spray pipe sprays clean water onto the steel strip 6 through the water outlet hole at the lower end of the half gear brush 45 to wash away the acid liquid. The brush head at the lower end of the half gear brush 45 is used to assist in speeding up the cleaning of the acid liquid. At the same time, the lower end gear is driven to rotate by the driving motor 46, and the gear drives the half gear brushes 45 on both sides to rotate. The half gear brush 45 is driven to reciprocate on the rack 48 through the cooperation of the half gears on both sides, and the radius of the half gear cooperates with the rack 48.

[0057] At the same time, a guide assembly 1 may also be provided at the cleaning brush assembly 4 to facilitate the guiding operation of the steel belt;

[0058] After the acid liquid is cleaned by water washing with the cleaning brush assembly 4, the equipment needs to be kept dry, and the water stains on the surface of the steel belt are cleaned by the water absorption assembly 5. The air outlet roller 56 on one side is driven to rotate by a rotating motor, and the other driven rollers and the air outlet roller 56 on the other side are driven to rotate by a chain, thereby driving the water absorption type surrounding belt 54 to rotate. At the same time, the blower 55 is used to accelerate the air flow, and a heating wire is also provided inside the blower 55 to increase the air evaporation effect. At the same time, the water absorption ports 52 provided on both sides of the water absorption type surrounding belt 54 are connected to an external vacuum pump to increase the air loss rate and accelerate the drying degree of the water absorption type surrounding belt 54.

[0059] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A multi-stage treatment method for residual dirty marks on the surface of a wide stainless steel strip, characterized in that: The inner side of the shell is divided into three areas by two partitions, namely, the pickling area, the clean water rinsing area, and the drying area. The steel strip is first sent forward into the pickling area, the clean water rinsing area, and the drying area through the guide assembly, including the following steps: S1: Confirm the nitric acid concentration, hydrogen fluoride concentration, metal ion concentration and acid temperature in the acid zone, and pickle the steel strip through the first mixed acid and second mixed acid, and soak it in the bottom of the pickling zone through the guide assembly; S2: The steel strip is moved and transported to the two groups of upper and lower opposing pickling brush assemblies provided at the upper end of the pickling area through the guide assembly for pickling. The double-threaded column provided on the pickling brush assembly rotates, and a cleaning mechanism is provided on the double-threaded column. The cleaning mechanism is guided to reciprocate through the double-threaded grooves on the double-threaded column. At the same time, the inner and outer brush heads on the cleaning mechanism rotate forward and reverse, and the acid is sprayed in coordination with the water spray port provided on the cleaning mechanism. The brush head speed is set at 4800-7000rpm. The same part of the steel strip is cleaned for 2-3 minutes. After cleaning, the steel strip moves to the next process intermittently; S3: When the steel strip passes through the pickling area and enters the clean water rinsing area, the steel strip first passes through the squeeze roller at the tail end of the pickling area to squeeze the acid to reduce the excessive acid entering the clean water rinsing area. The steel strip moves to the cleaning brush assembly, and the driving motor provided by the cleaning brush assembly drives the gear provided at the lower end. The gear drives the half-gear brushes provided on both sides to rotate. The half-gear brushes are engaged with the teeth on both sides of the rack through the half-gear provided at the upper end. The lower gear is driven by the driving motor to rotate, and the lower gear drives the half-gear brushes on both sides to rotate in the opposite direction to realize forward and backward movement. Reciprocating motion, reciprocating cleaning of the steel belt surface, and then cooperating with the water spray pipe provided on the cleaning brush assembly to spray cleaning water, which is sprayed onto the steel belt through the water spray port provided at the lower end of the half-gear brush, and the steel belt is rinsed with clean water. The driving motor drives the half-gear brushes on both sides to reciprocate. At the same time, the speed of the half-gear brush is 1000-1500rpm, and the same part of the steel belt is cleaned for 1-2 minutes. The steel belt continues to move forward, enters the bottom of the clean water rinsing area, contacts with water over a large area, and is washed and soaked, and then enters the cleaning brush assembly on the other side for secondary cleaning; S4: After washing and cleaning, when the steel belt passes through the tail end of the clean water rinsing area, another squeezing roller squeezes the surface of the steel belt, and the steel belt enters the drying area. The upper and lower ends of the drying area are provided with water absorption components. The steel belt passes through the water absorption component to remove surface moisture, and the steel belt moves between two opposite water absorption components. The rotating motor provided on the water absorption component is started to drive the air outlet roller and the driven roller on the water absorption component to rotate, and the roller drives the water absorption type surrounding belt provided on the outside to rotate, so as to absorb water stains on the surface of the steel belt. At the same time, the blower connected to the pipe on one side of the air outlet roller heats the gas through the heating wire provided inside the blower, blows air through the air outlet rollers provided on both sides of the surrounding belt, and then connects to the water suction port of the vacuum pump through the pipe on the outside of the surrounding belt, so that the water absorption type surrounding belt can absorb the moisture on the surface of the steel belt and reduce the moisture on the water absorption type surrounding belt itself.

2. The multi-stage treatment method for residual dirty marks on the surface of a wide stainless steel strip according to claim 1, characterized in that: In step S1, the first pickling: the nitric acid concentration is 55g / L-70g / L, the hydrogen fluoride concentration is 15g / L-20g / L, the metal ion is 30g / L-39g / L, and the temperature is 55-65°C. The second pickling: the nitric acid concentration is 70g / L-100g / L, the hydrogen fluoride concentration is 20g / L-30g / L, and the metal ion is 20g / L-30g / L.

3. The multi-stage treatment method for residual dirty marks on the surface of a wide stainless steel strip according to claim 1 is characterized in that: The guide assembly includes a conveying roller and a guide plate I. A V-shaped guide plate I is installed between the inner walls of both sides of the shell. A conveying roller is provided at the opening of the V-shaped guide plate I. Both sides of the conveying roller are connected to the shell through shafts. One side of the conveying roller is driven and connected to a rotating motor, and the rotating motor drives the remaining conveying rollers to rotate through a conveyor belt.

4. The multi-stage treatment method for residual dirty marks on the surface of a wide stainless steel strip according to claim 1 is characterized in that: The pickling brush assembly includes a lifting motor, which is correspondingly installed on both sides of the upper and lower ends of the shell, and an L-shaped plate is correspondingly installed on the lifting motor. A double-threaded column is axially connected between the upper and lower L-shaped plates, a rotating motor is provided on one side of the double-threaded column, a guide rod is provided on one side of the double-threaded column, a connecting frame is slidably connected to the guide rod, a rotatable steering block is provided on the connecting frame, a guide column is provided at the lower end of the steering block, the guide column is slidably fitted in the thread of the double-threaded column, and a cleaning mechanism is provided at the lower end of the connecting frame.

5. The multi-stage treatment method for residual dirty marks on the surface of a wide stainless steel strip according to claim 4 is characterized in that: The cleaning mechanism includes a shaft connection tube, a shaft connection tube is installed at the lower end of the connecting frame, a liquid inlet pipe is connected to the upper end pipeline of the shaft connection tube, a connecting tube is rotatably connected to the lower end of the shaft connection tube, a gear is provided on the connecting tube, the gear is meshed with another gear on one side, the other gear is driven by a rotating motor, the rotating motor is installed on the connecting frame, an inner brush head is provided at the lower end of the connecting tube, an outer brush head is rotatably connected to the outer side of the inner brush head, a water outlet is provided at the lower end of the inner brush head, the water outlet is matched with the middle cavity of the inner brush head, water outlet holes are provided at the lower ends of the inner brush head and the outer brush head, a gear ring is provided at the upper end of the outer brush head, the gear ring is meshed with a bevel gear, and the bevel gear is matched with the gear at the lower end of the rotating motor through a rotating shaft.

6. The multi-stage treatment method for residual dirty marks on the surface of a wide stainless steel strip according to claim 1 is characterized in that: Two groups of cleaning brush assemblies are provided on both sides of the clean water rinsing area, and each group of cleaning brush assemblies is arranged on the front and back sides of the steel belt. The cleaning brush assembly includes mounting plates, which are mounted on the inner walls of the shell on both sides. Racks are arranged between the mounting plates, and the racks are meshed with the half gears on the half gear brushes on both sides through the teeth on both sides. A gear is arranged at the lower end of the half gear, and another gear is meshed and connected between the gears on both sides. A driving motor is connected to the upper end of the other gear, and the driving motor is slidably mounted on a slot provided in the middle of the rack. Guide rails are arranged on both sides of the slot for limiting the rotation of the driving motor so that the rotating motor can better drive the lower end gear to rotate. A guide plate II is also arranged between the mounting plates for supporting and guiding the gears on the half gear brush and the rotating motor. The upper end of the half gear brush is axially connected to the water outlet of the water spray pipe, and the lower end of the half gear brush is provided with a water outlet and a brush head. The middle support column of the half gear brush is hollow inside and is used to connect the water spray pipe and the water outlet of the water spray hole.

7. The multi-stage treatment method for residual dirty marks on the surface of a wide stainless steel strip according to claim 1 is characterized in that: The water absorption component includes a lifting plate, a blowing device and a blower. Slots are provided on both sides of the shell, and screw rods and guide columns are provided in the slots. The upper end of the screw rod is connected to a rotating motor, and a lifting plate is cooperated with the screw rod and the guide column. A bracket is connected between the lifting plates, and an air outlet roller is rotatably installed on the bracket. The air outlet roller is provided with an air outlet. A pipe on one side of the air outlet roller is connected to the blowing device. The blowing device consists of a connecting pipe and a blower. The blower bracket is installed on the outer side of the lifting plate. A heating wire is also provided inside the blower to assist in the discharge of hot air. A driven roller is provided between the air outlet rollers on both sides. The air outlet roller and the driven roller are cooperated with a water absorption type surrounding belt, and a water absorption port is cooperated on the outer side of the water absorption type surrounding belt.

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