A method for laser derusting of a galvanised base strip steel

Abstract

The application discloses a galvanized base strip steel laser rust removal method, cold rolling surface inspection data is checked to obtain strip steel oxide scale defect data, a control system of a continuous hot galvanizing production line records a defect position, when reaching a rust removal process, precise rust removal is achieved by using a laser rust removal equipment, residual oxide scale on the surface of the strip steel is effectively removed, and influence caused by strip steel oxide scale weld quality is reduced. The laser rust removal equipment comprises a base, the top of the base is provided with a clamping and conveying assembly and a laser rust removal assembly; the clamping and conveying assembly is symmetrically arranged along the conveying direction of the strip steel, the laser rust removal assembly is arranged between the clamping and conveying assemblies, the strip steel is conveyed into the laser rust removal assembly by the clamping and conveying assembly, the laser rust removal assembly is divided into a surface rust removal unit and a side rust removal unit, comprehensive rust removal is achieved on the strip steel, residual oxide scale on the strip steel is cleaned, a basis is provided for subsequent welding process, and product quality is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of galvanizing base material processing, and particularly relates to a laser rust removal method for galvanizing base material strip steel. BACKGROUND

[0002] The continuous hot-dip galvanizing process is a common surface treatment technology, and the hot-dip galvanizing product has the characteristics of excellent corrosion resistance, low cost and long service life, so it is widely used in the fields of building, household appliances, electromechanical and automobile manufacturing. With the increasing market demand for hot-dip galvanized steel sheets, the requirements for the surface quality and formability of the hot-dip galvanizing product are also increasing.

[0003] The hot-dip galvanizing process flow is: feeding → unwinding → clamping and feeding, straightening → welding → surface pre-cleaning → inlet loop → annealing → hot-dip galvanizing → alloying → cooling → intermediate loop → finishing → stretch bending straightening → post-processing → inspection and winding. Due to the high speed of the continuous hot-dip galvanizing high-speed unit production line, under the condition of constant loop capacity, the welding time is short. At present, the head and tail of the galvanizing base material strip steel need to be cut off before welding, and the galvanizing base material strip steel surface is covered with iron oxide scale. The immersion of the iron oxide scale into the weld will result in poor welding quality, and in severe cases, there is a risk of strip breakage. Therefore, due to poor welding quality, the original weld needs to be cut off and re-welded, which will cause the loop capacity to be unable to meet the production demand under the condition of no speed reduction of the production speed, forcing the production line to slow down, causing the process parameters of the production line to fluctuate greatly, such as the risk of furnace temperature rising, strip temperature rising sharply, strip producing thermal wrinkles, zinc coating thickness thinning, etc., disrupting the production rhythm.

[0004] In addition, serious iron oxide scale acid washing in the production process of cold-rolled steel coils will result in a certain amount of iron oxide scale residue on the surface of the strip steel. Due to the limited acid washing capacity of the galvanizing unit, the serious iron oxide scale residue will result in the zinc alloy layer not meeting the quality requirements, and there are defects such as incomplete plating or weak adhesion of the zinc layer, which will cause difficulties in processing for downstream customers and unqualified finished product quality. At the same time, the serious iron oxide scale on the galvanizing base material strip steel will result in uneven welding temperature of the iron oxide scale at the welding position, and the immersion of the iron oxide scale into the weld will result in the weld quality not meeting the production requirements. After cold-rolled acid washing, the iron oxide scale will still be pressed into the surface of the steel base, and it is not easy to remove. Therefore, the alloy layer adhesion is not strong due to the iron oxide scale in the continuous hot-dip galvanizing welding or hot-coating process, resulting in local or continuous longitudinal color difference defects, and in severe cases, there is a risk of strip breakage. Therefore, a laser rust removal equipment for galvanizing base material strip steel is needed to remove the iron oxide scale on the surface of the galvanizing base material strip steel before welding. SUMMARY

[0005] The application provides a laser rust removal method for galvanized base material strip steel, aiming at effectively removing the residual oxide scale on the surface of the galvanized base material strip steel to improve the welding quality and orderly produce high-quality hot-dip galvanized products.

[0006] The application is a laser rust removal method for galvanized base material strip steel, which is realized by a laser rust removal device.

[0007] The clamping and conveying assemblies are symmetrically arranged vertically to the conveying direction of the strip steel, and each clamping and conveying assembly comprises a stand fixed to the base, a supporting roller fixed to the lower part of the stand, a hollow upper part of the stand, a sliding block connected to the hollow part, and a conveying roller rotatably connected to the sliding block.

[0008] The laser rust removal assembly is arranged between the clamping and conveying assemblies and comprises a surface rust removal unit and a side rust removal unit.

[0009] The side rust removal unit is arranged on the two sides of the strip steel in a staggered manner and comprises an F-shaped frame driven by a second driving member.

[0010] The laser rust removal method for the galvanized base material strip steel comprises the following steps:

[0011] Step one: carry out the base material production data correction of the galvanized base strip steel and the galvanizing raw material inspection, if the cold-rolled surface inspection data and the cold-rolled surface quality are normal, execute step two; if the cold-rolled surface inspection data and the cold-rolled surface quality are not normal, the oxide scale defects are detected, or the rust defects are found on the strip steel after uncoiling, execute step three;

[0012] Step two: use the laser rust removal equipment to remove the rust of the strip head and tail, send the 500-600mm position before and after the welding position of the strip head and tail of the strip steel after rust removal into the welding machine for welding, and obtain the product with good weld quality;

[0013] Step three: transmit the oxygen iron defect position and length data recorded by the cold-rolled surface inspection data to the control system of the continuous hot galvanizing production line, and execute step four;

[0014] Step four: the laser rust removal equipment receives the data of the continuous hot galvanizing production line control system to remove the rust at the oxygen iron defect position, and sends it into the welding machine for welding after the rust removal is completed, and obtains the product with good weld quality.

[0015] Preferably, the surface rust removal device below the strip steel penetration direction is connected with the inner wall of the rust removal chamber through a mounting bracket, and a collection frame is arranged at the bottom of the inner cavity of the rust removal chamber.

[0016] Preferably, a plurality of pulleys are symmetrically arranged at the bottom of the collection frame, and a second handle is arranged on one side of the collection frame close to the first handle.

[0017] Preferably, the inner wall of the rust removal chamber above the collection frame is symmetrically provided with inclined guide plates inclined toward the collection frame.

[0018] Preferably, H-shaped supports are symmetrically arranged at the bottom of the base, and the horizontal part of the H-shaped support is sleeved with a moving wheel, and the bottom of the moving wheel is provided with a matching sliding rail.

[0019] Preferably, a movable door is arranged on one side of the rust removal chamber adjacent to the strip steel channel, and a first handle and an observation window are arranged on the movable door.

[0020] Preferably, a soft brush is arranged in the inner circle of the strip steel channel.

[0021] Preferably, the outer side of the longitudinal part of the F-shaped frame and the free end of the transmission screw are both supported by bearing seats.

[0022] Preferably, the first driving member and the second driving member are both step motors or servo motors; and the first telescopic member and the second telescopic member are both electric telescopic rods or air cylinders.

[0023] Preferably, the rust removal range of the side rust removal unit depends on the wave shape of the strip steel and the tension of the strip steel on the production line; the rust removal center point of the side rust removal unit is n, the center line of the production line is m, the highest point of the wave shape of the strip steel is m1, the lowest point of the wave shape of the strip steel is m2, the thickness of the strip steel is h, the height of the strip steel deviating from the highest point m1 of the wave shape is h1, the height of the strip steel deviating from the lowest point m2 of the wave shape is h2, and the rust removal range H of the side rust removal unit is h + h1 + h2; the automatic compensation distance of the side rust removal unit from the center line m of the production line is Δh, and Δh = m - n.

[0024] The beneficial effects of the present application are as follows:

[0025] 1. The galvanized base strip steel laser rust removal method provided by the present application, cold rolling surface inspection data is used to check the strip steel oxide scale defect data, the control system of the continuous hot galvanizing production line records the defect position, and when the rust removal process is reached, the laser rust removal equipment is used for accurate rust removal, effectively removing the residual oxide scale on the surface of the strip steel, reducing the influence of the strip steel oxide scale weld quality, and improving the finished product quality.

[0026] 2. The galvanized base strip steel laser rust removal method provided by the present application, the strip steel is conveyed into the laser rust removal assembly by the pinch roll assembly, the laser rust removal assembly is divided into a surface rust removal unit and a side rust removal unit, and the strip steel is comprehensively rust removed to clean the residual oxide scale on the strip steel, thereby providing a basis for the subsequent welding process, obtaining a finished product with good weld quality, reducing the risk of strip cracking and strip breakage, improving the finished product quality and production efficiency, and providing a guarantee for subsequent safe and orderly production of hot coating.

[0027] 3. The galvanized base strip steel laser rust removal method provided by the present application, the pinch roll assembly and the laser rust removal assembly are both fixedly arranged on the base, and the base is provided with moving wheels at the bottom, so that the base is flexible to move, and is convenient for offline maintenance and online use.

[0028] 4. The galvanized base strip steel laser rust removal method provided by the present application, the surface rust removal device is provided with protective frames symmetrically arranged on both sides, the free end of the protective wheel at the end of the protective frame exceeds the head of the first laser head, so that the surface rust removal device can be prevented from being accidentally damaged due to sudden abnormal breakage or poor plate shape of the strip steel, and the outer side of the limiting roller on both sides of the side rust removal device exceeds the head of the second laser head, so that the second laser head can be protected from being damaged by the strip steel, and the strip steel can be limited, so that the safety performance is high and the service life is long.

[0029] 5. The galvanized base strip steel laser rust removal method provided by the present application, the inner circle of the strip steel channel of the rust removal chamber is provided with a soft brush, so that the dust and rust powder adhered to the strip steel can be continuously cleaned and swept into the rust removal chamber, and then flow into the collection frame at the bottom of the rust removal chamber through the inclined guide plates symmetrically arranged on the inner wall of the rust removal chamber, so that the dust and rust powder can be concentrated and collected, and the purpose of regular cleaning can be achieved. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 The overall structure schematic diagram of the laser rust removal equipment of the present application;

[0031] Figure 2 The front view of the side rust removal unit of the present application;

[0032] Figure 3 The left view of Figure 2 ;

[0033] Figure 4 The top view of Figure 2 ;

[0034] Figure 5 The structure schematic diagram of the rust removal chamber of the present application;

[0035] Figure 6 The working schematic diagram of the laser rust removal equipment of the present application;

[0036] Figure 7 The data transmission route diagram of the laser rust removal method of the present application;

[0037] Figure 8 The data execution schematic diagram of the laser rust removal method of the present application;

[0038] Figure 9 The rust removal range schematic diagram of the side rust removal unit of the present application;

[0039] Figure 10 The process flow diagram of the laser rust removal method of the present application;

[0040] In the figure: 1-laser rust removal equipment; 2-base; 21-H-shaped support; 22-moving wheel; 23-sliding rail; 3-laser rust removal assembly; 4-pinch assembly; 41-first telescopic part; 42-conveying roller; 43-sliding block; 44-supporting roller; 45-stand; 5-strip steel; 6-surface rust removal unit; 61-rust removal chamber; 62-strip steel passage; 63-surface rust removal device; 64-mounting frame; 65-second telescopic part; 66-protection frame; 67-protection wheel; 68-collection frame; 69-soft brush; 601-first handle; 602-observation window; 603-pulley; 604-second handle; 605-inclined guide plate; 606-movable door; 7-side rust removal unit; 71-F-shaped frame; 72-bidirectional screw rod; 73-mounting shaft; 74-limiting roller; 75-side rust removal device; 76-limiting plate; 77-driving motor; 78-transmission screw; 79-stop block; 701-first stop position limiter; 702-first deceleration position limiter; 703-second deceleration position limiter; 704-second stop position limiter; 705-bearing seat. DETAILED DESCRIPTION

[0041] The application will be further described below with reference to the drawings:

[0042] As shown in the drawings, Figures 1-10 The application is a method for laser rust removal of galvanized base strip steel, which is realized by a laser rust removal device 1. The laser rust removal device 1 comprises a base 2, and the top of the base 2 is provided with a laser rust removal assembly 3 and two groups of pinch roll assemblies 4. The bottom of the base 2 is symmetrically provided with H-shaped supports 21, the horizontal part of the H-shaped supports 21 is provided with a moving wheel 22, and the bottom of the moving wheel 22 is provided with a matching sliding rail 23, which facilitates the movement of the base 2.

[0043] The pinch roll assemblies 4 are symmetrically arranged vertically to the conveying direction of the strip steel 5. The pinch roll assembly 4 comprises a stand 45 fixedly connected with the base 2, a supporting roller 44 fixedly connected with the lower part of the stand 45, a hollow upper part of the stand 45, a sliding block 43 connected with the hollow part, and a conveying roller 42 rotatably connected with the sliding block 43. The top of the stand 45 is provided with a first telescopic member 41, the telescopic end of the first telescopic member 41 penetrates through the top of the stand 45 and is connected with the sliding block 43, and the conveying roller 42 is driven by a first driving member (which can be realized by the existing technology, not shown in the figure).

[0044] The laser rust removal assembly 3 is arranged in the middle of the pinch roll assemblies 4 and comprises a surface rust removal unit 6 and a side rust removal unit 7. The surface rust removal unit 6 comprises a rust removal chamber 61 arranged at the center position of the two groups of pinch roll assemblies 4. The rust removal chamber 61 is provided with strip steel passages 62 on both sides along the strip steel 5 entering direction. The inner ring of the strip steel passage 62 is provided with a soft brush 69. The side of the rust removal chamber 61 adjacent to the strip steel passage 62 is provided with a movable door 606. The movable door 606 is provided with a first handle 601 and an observation window 602. Symmetrically provided on the two inner walls of the rust removal chamber 61 perpendicular to the strip steel 5 entering direction are surface rust removal devices 63. The surface rust removal device 63 below the strip steel 5 entering direction is connected with the inner wall of the rust removal chamber 61 through a mounting bracket 64. The surface rust removal device 63 comprises a second telescopic member 65, which is an electric telescopic rod. The telescopic end of the second telescopic member 65 is connected with a first laser head. The second telescopic member 65 is adjusted according to the width of the strip steel 5 during rust removal, so that the rust removal range of the first laser head can fully cover the width of the strip steel 5. Symmetrically provided on both sides of the surface rust removal device 63 are protection frames 66. One end of the protection frame 66 is fixedly connected with the inner wall of the rust removal chamber 61, and the other end is connected with a protection wheel 67. The free end of the protection wheel 67 exceeds the head of the first laser head. The bottom of the rust removal chamber 61 is provided with a collection frame 68. The bottom of the collection frame 68 is symmetrically provided with six groups of pulleys 603. The side of the collection frame 68 close to the first handle 601 is provided with a second handle 604. The inner wall of the rust removal chamber 61 above the collection frame 68 is symmetrically provided with inclined guide plates 605 inclined towards the collection frame 68.

[0045] The side rust removal unit 7 is arranged on both sides of the strip steel 5, and includes an F-shaped frame 71 driven by a second driving member (which can be realized by the prior art, not shown in the figure) which is a servo motor. The bottom of the F-shaped frame 71 is threadedly connected to the base 2 through a bidirectional screw rod 72. A vertical mounting shaft 73 is symmetrically arranged between the two horizontal parts of the F-shaped frame 71. A limiting roller 74 is sleeved on the mounting shaft 73. A side rust removal device 75 is vertically arranged on the longitudinal part of the F-shaped frame 71 between the limiting rollers 74. The side rust removal device 75 is connected to a second laser head at one end close to the strip steel 5, and penetrates through the F-shaped frame 71 at the other end. The limiting roller 74 is outside the head of the second laser head, and abuts against the side edge of the strip steel 5. A limiting plate 76 is arranged at the joint of the side rust removal device 75 and the F-shaped frame 71, and the limiting plate 76 is slidingly connected to the F-shaped frame 71. A driving motor 77 and a bearing seat 705 are arranged on the longitudinal part of the F-shaped frame 71. A vertical transmission screw rod 78 is connected to the output end of the driving motor 77. The free end of the transmission screw rod 78 penetrates through the side rust removal device 75 and is supported by the bearing seat 705. A first stop position limiter 701, a first deceleration position sensor 702, a second deceleration position sensor 703 and a second stop position limiter 704 are sequentially arranged on the F-shaped frame 71 in the moving direction of the side rust removal device 75. A stop block 79 is arranged on the side of the side rust removal device 75 close to the first stop position limiter 701.

[0046] The control system receives the signals of the first stop position limiter 701, the first deceleration position sensor 702, the second deceleration position sensor 703 and the second stop position limiter 704 to control the driving motor 77 to decelerate or stop.

[0047] The method for laser rust removal of the galvanized base strip steel by using the laser rust removal equipment 1 includes the following steps:

[0048] Step one: the base data of the galvanized base strip steel 5 is checked S1 and the galvanized raw material is inspected S2. If the cold-rolled surface inspection data and the cold-rolled surface quality are normal, step two is performed. If the cold-rolled surface inspection data and the cold-rolled surface quality are not normal, the oxide scale defects are detected, or the rust defects are found on the strip steel 5 after unwinding, step three is performed.

[0049] Step two: the laser rust removal equipment 1 is used to remove the rust of the head and tail of the strip steel 5. The positions 500 mm before and after the welding position of the head and tail of the strip steel 5 after rust removal are sent into the welding machine H for welding, so that the product with good weld quality is obtained.

[0050] Step three: the position and length data of the iron oxide defects recorded by the cold-rolled surface inspection data are transmitted to the control system of the continuous hot galvanizing production line, and step four is performed.

[0051] Step 4: Laser rust removal equipment 1 receives data from the control system of the continuous hot-dip galvanizing production line to remove rust from ferrous oxide defects. After rust removal, it is sent to welding machine H for welding to obtain a product with good weld quality.

[0052] Among them, the laser rust removal range 31 of the side rust removal unit 7 depends on the wave shape of the strip steel 5 and the tension of the strip steel 5 on the production line; such as Figure 9 As shown, the rust removal center point of the side rust removal unit 7 is n, the production line centerline is m, the highest point of the wavy shape of strip steel 5 is m1, the lowest point of the wavy shape of strip steel 5 is m2, the thickness of strip steel 5 is h, the height of strip steel 5 deviating upward from the highest point of the wavy shape m1 is h1, and the height of strip steel 5 deviating downward from the lowest point of the wavy shape m2 is h2. Therefore, the rust removal range of the side rust removal unit 7 is H = h + h1 + h2; the automatic compensation distance between the side rust removal unit 7 and the production line centerline m is Δh, where Δh = mn. Changes in the thickness of strip steel 5 or the wavy shape of the strip steel 5's edge will cause changes in the position of the side rust removal unit 7. The rust removal range of the side rust removal unit 7 must be adjusted within the range of changes in the wavy shape of strip steel 5, and the laser irradiation range must also be adjusted according to the up-and-down swing of strip steel 5.

[0053] The following uses any strip steel 5 as an example to illustrate the laser rust removal method:

[0054] Step 1: Perform the production data verification S1 and galvanized raw material inspection S2 for galvanized base strip 5. If the cold rolling surface inspection data and cold rolling surface quality are abnormal, oxide scale defects are detected, and rust defects are found on strip 5 after uncoiling, proceed to Step 3.

[0055] Step 3: Transmit the location and length of the oxygen iron defect recorded in the cold rolling inspection data to the control system of the continuous hot-dip galvanizing production line, and then proceed to Step 4;

[0056] Step 4: Laser rust removal equipment 1 receives data from the continuous hot-dip galvanizing production line control system to remove rust from oxygen-iron defects. The rust removal process is as follows:

[0057] The strip steel 5 is passed through the clamping assembly 4 at the starting end of the conveying direction. The roller surface of the clamping assembly 4 is a rubber roller. The linear speed of the clamping assembly 4 is the same as the linear speed of the uncoiler at the entrance of the production line to prevent steel from piling up. The support roller 44 and the conveying roller 42 establish tension to put the strip steel 5 into the strip steel channel 62. During conveying, the telescopic end of the first telescopic member 41 drives the slider 43 to move downward along the hollow inner cavity of the clamping assembly 4. The slider 43 then drives the conveying roller 42 to move downward, so that the conveying roller 42 cooperates with the support roller 44 to squeeze the strip steel 5. The first driving member drives the conveying roller 42 to rotate. The conveying roller 42 and the support roller 44 cooperate to convey the strip steel 5 and prevent the strip steel 5 from curling.

[0058] The side rust removal units 7 are arranged on both sides of the strip steel 5, and the limiting rollers 74 of the two side rust removal units 7 are located outside the head of the second laser head and abut against the strip steel 5, so as to limit the left and right deviation distance of the strip steel 5, avoid the strip steel 5 from colliding and damaging the second laser head due to deviation, and the strip steel 5 is conveyed to pass through the side rust removal units 7 for rust removal on both sides; the side rust removal device 75 is provided with a limiting plate 76 at the joint with the F-shaped frame 71, the limiting plate 76 is in sliding connection with the F-shaped frame 71, and when rust removal is performed, the driving motor 77 drives the transmission screw 78 to move up and down, the transmission screw 78 drives the side rust removal device 75 to move up and down along the F-shaped frame 71, so as to satisfy the rust removal work of strip steels 5 of different specifications; the F-shaped frame 71 in the moving direction of the side rust removal device 75 is sequentially provided with a first stop position limiter 701, a first deceleration position sensor 702, a second deceleration position sensor 703 and a second stop position limiter 704 from top to bottom, the side rust removal device 75 is provided with a stop block 79 on the side close to the first stop position limiter 701, and the stop block 79 is used for triggering the signal that the side rust removal device 75 runs to the upper and lower deceleration positions and stop positions, so when the control system of the continuous hot galvanizing production line receives the signal that the sensor detects the first deceleration position sensor 702 or the second deceleration position sensor 703, the driving motor 77 is controlled to decelerate, which indicates that the side rust removal device 75 has approached the upper and lower surface limit positions of the strip steel 5, and when the control system of the continuous hot galvanizing production line receives the signal that the first stop position limiter 701 or the second stop position limiter 704, the driving motor 77 is controlled to stop, which indicates that the side rust removal device 75 has deviated from the strip steel 5 and cannot effectively perform the rust removal work, and the control system ensures that the side rust removal device 75 operates within a safe range;

[0059] The flat strip steel 5 enters the rust removal chamber 61 through the strip steel passage 62, the surface rust removal device 63 is located at the central axis of the strip steel 5, and during conveying, the surface rust removal device 63 performs accurate rust removal work on the upper and lower surfaces of the strip steel 5 according to the defect data of the continuous hot galvanizing production line control system; the protective frame 66 is symmetrically arranged on both sides of the surface rust removal device 63, the free end of the protective wheel 67 at the end of the protective frame 66 exceeds the head of the first laser head, and the surface rust removal device 63 is avoided from being accidentally damaged due to sudden abnormal fracture or poor plate shape of the strip steel 5;

[0060] When rust removal is performed in the rust removal chamber 61, the soft brush 69 in the inner circle of the strip steel passage 62 continuously cleans the dust and rust powder adhered to the strip steel 5 and sweeps into the rust removal chamber 61, and then flows into the collection frame 68 at the bottom of the rust removal chamber 61 through the inclined guide plates 605 symmetrically arranged on the inner wall of the rust removal chamber 61; the rust removal chamber 61 is provided with a first handle 601 and an observation window 602 on one side adjacent to the strip steel passage 62, the inside of the rust removal chamber 61 can be observed through the observation window 602, the movable door 606 is opened by holding the first handle 601, and the collection frame 68 is pulled out to be regularly cleaned by pulling the second handle 604;

[0061] Finally, the strip steel 5 after rust removal enters the supporting roller 44 and the conveying roller 42 at the end of the conveying direction, the first telescopic part 41 drives the sliding block 43 to move downward, and the sliding block 43 drives the conveying roller 42 to move downward, so that the conveying roller 42 cooperates with the supporting roller 44 to extrude the strip steel 5, the first driving part drives the conveying roller 42 to rotate, and the conveying roller 42 cooperates with the supporting roller 44 to convey the strip steel 5 to a welding process; when the front-rear steel coil welding unit keeps the production line speed, the running speed of the strip steel 5 is greatly improved, and when the speed is greater than 30 m / min, the conveying roller 42 of the front-rear pinch roll assembly 4 is opened (since the running speed of the strip steel 5 is less than or equal to 30 m / min, the main purpose is to weld the strip steel 5, to check the quality of the strip steel 5, to handle equipment faults online, to test the speed, to handle process faults, etc.), and the tensioning roller of the production line and the uncoiler establish tension to keep the strip steel 5 flat, so that only the supporting roller 44 needs to participate in running.

[0062] After rust removal, the strip head and the strip tail of the strip steel 5 after rust removal are sent to the welding machine H for welding at positions 500 mm before and after the welding position, so as to obtain a product with good weld quality; as shown in Figure 8 , the welded product is sent to other equipment D for processing to obtain a finished product E, which is finally sold to an end customer F, as shown in Figure 10 , the end customer F feeds back the influence of different iron oxide scale defects on the product after using the finished product E, optimizes the parameters of the laser rust removal equipment 1 again according to the feedback information, such as laser rust removal power, laser rust removal position and laser rust removal range, accumulates defect data, optimizes the database, avoids the occurrence of similar defects, completes closed-loop quality control, and obtains a finished product E with better quality.

[0063] As shown in Figure 7 , the laser rust removal method of the galvanized base strip steel of the present application is to arrange the laser rust removal equipment 1 before the welding machine H, mainly to adjust the feedback of the raw material information of the strip steel 5 and the quality of the product after rust removal, which is a closed-loop rust removal method. Before welding, the base production data of the steel coil to be welded is required, including the cold-rolled surface inspection of the entire strip steel 5, the defect position record of the iron oxide data S101, the production date S102, the emulsion concentration S103, the strip reflectivity S104 and other information to judge whether the strip steel 5 surface exists the iron oxide scale corrosion caused by the weather condition and the humidity of the warehouse area and other environmental factors, also including the results of the galvanizing raw material inspection S2, specifically the steel coil cross section corrosion S201, the plate shape and cutting loss S202, the strip steel surface iron oxide S203, the galvanizing unit speed S204, the galvanizing pickling data S205 and other information. The above information facilitates the laser rust removal equipment 1 to accurately remove rust during welding, improves the welding quality, and can also drive the power output of the laser rust removal equipment 1 according to the severity, position and length of the rust, and remove the corresponding iron oxide scale at the defect position.

[0064] The strip thickness data S301, the strip shape data S302, the strip surface quality S303, the laser rust removal of the upper surface of the steel coil S304, the laser rust removal of the lower surface of the steel coil S305, the laser rust removal of the working side of the steel coil S306, the laser rust removal of the transmission side of the steel coil S307 and other core data S3 obtained by the laser rust removal equipment 1 are adjusted. The content of the adjustment data S4 is the laser rust removal equipment height adjustment S401, the laser rust removal equipment position adjustment S402, the laser rust removal general mode selection S403 and the like. Finally, the product quality feedback is obtained by combining the artificial inspection and the physicochemical test data. The feedback result is fed back to the laser rust removal equipment 1. The processing situation of the serious degree and the defect position of the oxide scale is analyzed. Then, the parameters of the laser rust removal equipment 1 are optimized. The data accumulation and the adjustment of the laser rust removal equipment 1 are well done. The closed loop control is formed. The product E with better quality is obtained. The customer demand is met.

Claims

1. A method for laser rust removal of galvanized steel strip, characterized in that: The method is achieved by a laser rust removal device (1), which includes a base (2), a laser rust removal component (3) and two sets of clamping components (4) on the top of the base (2). The clamping assembly (4) is symmetrically arranged in the direction of conveying the strip steel (5) perpendicular to the direction of conveying. The clamping assembly (4) includes a column (45) fixedly connected to the base (2). A support roller (44) is fixedly connected to the lower part of the column (45). The upper part of the column (45) is hollow. A slider (43) is slidably connected to the hollow part. A conveying roller (42) is rotatably connected to the slider (43). A first telescopic member (41) is provided at the top of the column (45). The telescopic end of the first telescopic member (41) passes through the top of the column (45) and is connected to the slider (43). The conveying roller (42) is driven by a first driving member. The laser rust removal assembly (3) is located between the clamping assemblies (4) and includes a surface rust removal unit (6) and a side rust removal unit (7). The surface rust removal unit (6) includes a rust removal chamber (61) located at the center of the two clamping assemblies (4). The rust removal chamber (61) has strip steel channels (62) on both sides along the direction of the strip steel (5) entering. The rust removal chamber (61) has surface rust removal devices (63) symmetrically arranged on the two inner walls perpendicular to the direction of the strip steel (5) entering. The surface rust removal device (63) includes a second telescopic member (65). The telescopic end of the second telescopic member (65) is connected to a first laser head. The surface rust removal device (63) has protective frames (66) symmetrically arranged on both sides. One end of the protective frame (66) is fixed to the inner wall of the rust removal chamber (61), and the other end is connected to a protective wheel (67). The free end of the protective wheel (67) extends beyond the head of the first laser head. The side rust removal unit (7) is offset and disposed on both sides of the strip (5), including an F-shaped frame (71), which is driven by a second driving component; the bottom of the F-shaped frame (71) is screwed to the base (2) by a double-acting screw (72), and vertical mounting shafts (73) are symmetrically arranged between the two horizontal parts of the F-shaped frame (71). A limiting roller (74) is sleeved on the mounting shaft (73), and a side rust removal device (75) is vertically arranged on the longitudinal part of the F-shaped frame (71) between the limiting rollers (74). The side rust removal device (75) is connected to a second laser head at one end near the strip (5), and the other end passes through the F-shaped frame (71); the outer side of the limiting roller (74) extends beyond the head of the second laser head, and the outer side of the limiting roller (74) abuts against the side of the strip (5); A limiting plate (76) is provided at the junction of the side rust removal device (75) and the F-type frame (71). The limiting plate (76) is slidably connected to the F-type frame (71). A drive motor (77) is provided on the outer side of the longitudinal part of the F-type frame (71). A vertical transmission screw (78) is connected to the output end of the drive motor (77). The free end of the transmission screw (78) passes through the side rust removal device (75). From top to bottom, the F-type frame (71) in the moving direction of the side rust removal device (75) is provided with a first stop position limiter (701), a first deceleration position sensor (702), a second deceleration position sensor (703), and a second stop position limiter (704). A stop block (79) is provided on the side of the side rust removal device (75) near the first stop position limiter (701). The laser rust removal method for galvanized steel strip includes the following steps: Step 1: Perform the production data verification (S1) and inspection (S2) of the base material of the galvanized base strip (5). If the cold rolling surface inspection data and the cold rolling surface quality are normal, proceed to Step 2; if the cold rolling surface inspection data and the cold rolling surface quality are abnormal, oxide scale defects are detected, or rust defects are found on the strip (5) after uncoiling, proceed to Step 3. Step 2: Use laser rust removal equipment (1) to remove rust from the head and tail of the strip steel (5). After rust removal, send the head and tail of the strip steel (5) 500-600mm before and after the welding position to be welded into the welding machine for welding to obtain a product with good weld quality. Step 3: Transmit the location and length of the oxygen iron defect recorded in the cold rolling inspection data to the control system of the continuous hot-dip galvanizing production line, and then proceed to Step 4; Step 4: Laser rust removal equipment (1) Receives data from the control system of the continuous hot-dip galvanizing production line to remove rust from the ferrous oxide defects. After the rust removal is completed, it is sent to the welding machine for welding to obtain a product with good weld quality.

2. The laser rust removal method for galvanized steel strip as described in claim 1, characterized in that: The surface rust removal device (63) below the direction of the strip (5) is connected to the inner wall of the rust removal chamber (61) via a mounting bracket (64), and a collection frame (68) is provided at the bottom of the inner cavity of the rust removal chamber (61).

3. The laser rust removal method for galvanized steel strip as described in claim 2, characterized in that: The bottom of the collection box (68) is symmetrically provided with several pulleys (603), and a second handle (604) is provided on the side of the collection box (68) near the first handle (601).

4. The laser rust removal method for galvanized steel strip as described in claim 3, characterized in that: The inner wall of the rust removal chamber (61) above the collection frame (68) is symmetrically provided with inclined guide plates (605) that are inclined toward the collection frame (68).

5. The laser rust removal method for galvanized steel strip as described in claim 1, characterized in that: The base (2) is symmetrically provided with H-shaped brackets (21) at the bottom, and the horizontal part of the H-shaped brackets (21) is fitted with moving wheels (22), and the bottom of the moving wheels (22) is provided with matching sliding tracks (23).

6. The laser rust removal method for galvanized steel strip as described in claim 1, characterized in that: A movable door (606) is provided on one side of the rust removal chamber (61) adjacent to the strip steel channel (62). The movable door (606) is provided with a first handle (601) and an observation window (602).

7. The laser rust removal method for galvanized steel strip as described in claim 6, characterized in that: The inner ring of the strip channel (62) is provided with a soft brush (69).

8. A laser rust removal method for galvanized base steel strip as described in any one of claims 1-7, characterized in that: The outer longitudinal section of the F-type frame (71) and the free end of the transmission screw (78) are both supported by bearing seats (705).

9. The laser rust removal method for galvanized steel strip as described in claim 8, characterized in that: Both the first and second driving components are stepper motors or servo motors; both the first telescopic component (41) and the second telescopic component (65) are electric telescopic rods or cylinders.

10. The laser rust removal method for galvanized base steel strip as described in claim 1, characterized in that: The laser rust removal range (31) of the side rust removal unit (7) depends on the wave shape of the strip (5) and the tension of the strip (5) on the production line; the rust removal center point of the side rust removal unit (7) is n, the center line of the production line is m, the highest point of the wave shape of the strip (5) is m1, the lowest point of the wave shape of the strip (5) is m2, the thickness of the strip (5) is h, the height of the strip (5) deviating upward from the highest point of the wave shape m1 is h1, and the height of the strip (5) deviating downward from the lowest point of the wave shape m2 is h2. Then the rust removal range H of the side rust removal unit (7) is H = h + h1 + h2; the automatic compensation distance between the side rust removal unit (7) and the center line m of the production line is △h, △h = mn.

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