A production process for galvanized steel strip

Abstract

The invention relates to the technical field of strip galvanizing, in particular to a production process for galvanized strip steel, wherein a hot-dip galvanizing device comprises a galvanizing pool, a support plate is fixedly connected to the inner wall of the galvanizing pool, and conveying rollers are symmetrically arranged on the inner wall of the galvanizing pool, and the hot-dip galvanizing device further comprises: a detection unit, which is arranged on the side wall of the hot-dip galvanizing device and is used to detect the thickness of the strip steel; an input port and an output port, which are symmetrically penetrated and opened on the top of the support plate, and airflow blowing mechanisms are arranged at the input port and the output port, and the airflow blowing mechanisms are used to block external air from entering the interior of the galvanizing pool; according to the strip steel thickness detected by the detection unit, two airflow blowing mechanisms are controlled to adaptively adjust to achieve airflow sealing, which is beneficial to maintaining the stability of the gas environment inside the galvanizing pool, helping to improve the gas coverage rate of the entire strip steel surface, and reducing local air retention caused by uneven gas distribution.

Description

Technical Field

[0001] The invention relates to the field of strip steel galvanizing, and in particular to a production process for galvanized strip steel. Background Art

[0002] Galvanizing refers to a surface treatment technology that coats a layer of zinc on the surface of metal, alloy or other materials for aesthetic purposes and to prevent rust.

[0003] When galvanizing steel strips, the galvanizing treatment is usually completed by passing the steel strips through the zinc liquid inside the galvanizing pool. However, during the hot-dip galvanizing process, the steel strips may cause an oxidation reaction when in contact with the zinc liquid, so corresponding sealing treatment is required. The existing galvanizing pool is too simple in design, which easily causes sealing leakage at the inlet and outlet of the galvanizing pool, resulting in unsatisfactory sealing effect, and it is not convenient to perform sealing treatment on steel strips of different thicknesses. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a production process for galvanized steel strip.

[0005] The present invention provides a production process for galvanized steel strip, comprising the following steps:

[0006] Step 1: Surface treatment of steel strip: pickling, degreasing and surface activation of the steel strip to remove oxides, grease and impurities on the surface;

[0007] Step 2: Pretreatment of steel strip: Immerse the surface treated steel strip in the pretreatment tank for further rust removal and cleaning to ensure the cleanliness of the steel strip surface;

[0008] Step 3: Hot-dip galvanizing: The strip steel in the conveying process is hot-dip galvanized by the hot-dip galvanizing device;

[0009] Step 4: Post-processing: Quality inspection of galvanized steel strip;

[0010] Wherein, the hot-dip galvanizing device in step 3 comprises a galvanizing pool, a support plate is fixedly connected to the inner wall of the galvanizing pool, and conveying rollers are symmetrically arranged on the inner wall of the galvanizing pool. The hot-dip galvanizing device also includes:

[0011] A detection unit, arranged on the side wall of the hot-dip galvanizing device, for detecting the thickness of the steel strip;

[0012] An input port and an output port, the input port and the output port are symmetrically opened on the top of the support plate, and an airflow blowing mechanism is provided at the input port and the output port, and the airflow blowing mechanism is used to prevent external air from entering the galvanizing pool;

[0013] The controller controls the two air flow blowing mechanisms to adjust adaptively to achieve air flow sealing according to the strip thickness detected by the detection unit;

[0014] The airflow blowing mechanism comprises:

[0015] A fixed frame, fixedly connected to the top of the support plate, a static storage cover is fixedly connected to the inner wall of the fixed frame, and a dynamic storage cover is also arranged on the inner wall of the fixed frame through a pulling mechanism, and air outlets are opened on the surfaces of the static storage cover and the dynamic storage cover;

[0016] An adjusting mechanism is arranged on the side wall of the fixing frame, and during the operation of the pulling mechanism, the adjusting mechanism is linked to adjust the size of the two air outlets;

[0017] The gas delivery mechanism is arranged on the top of the support plate and is used for delivering inert gas to the inside of the static storage cover and the dynamic storage cover.

[0018] Preferably, the pulling mechanism comprises:

[0019] A mounting groove is provided on the side wall of the fixing frame, an electric cylinder is fixedly installed inside the mounting groove, and an end of a piston rod of the electric cylinder is fixedly connected to the dynamic storage cover;

[0020] A sealing plate is slidably connected to the inner bottom surface of the mounting groove, an end of the sealing plate is fixedly connected to the side wall of the dynamic storage cover, and the side wall of the sealing plate is in sealing contact with the inner wall of the mounting groove.

[0021] Preferably, the adjustment mechanism comprises:

[0022] Two fixed plates are respectively fixedly connected to the inner walls of the dynamic storage cover and the static storage cover, each of the fixed plates is symmetrically rotatably connected to a rotating shaft on the side wall, each of the rotating shafts is fixedly connected to a connecting plate on the surface, each of the connecting plates is fixedly connected to an arc plate at the end, and each of the arc plates is slidably connected to the inner wall of the dynamic storage cover or the static storage cover;

[0023] The rotating component is arranged on the side wall of the fixed frame. When the dynamic storage cover moves, the linkage rotating component drives the two rotating shafts on the side wall of each fixed plate to rotate in opposite directions, so as to adjust the size of the air outlet.

[0024] Preferably, the rotating component comprises:

[0025] Two clearance openings are symmetrically opened on the inner wall of the fixing frame;

[0026] Two first connecting shafts are respectively fixedly connected to the ends of the two rotating shafts inside the dynamic storage cover, and the ends of the two first connecting shafts both penetrate the dynamic storage cover and pass through the adjacent clearance openings and are fixedly connected to the first gears;

[0027] Two first racks are respectively fixedly connected to two sides of the fixed frame, the two first racks are respectively meshed with the two first gears, the front first rack is located above the first gear, and the rear first rack is located below the first gear;

[0028] Two second connecting shafts are rotatably connected to the side walls of the fixed frame, and the two second connecting shafts are fixedly connected to the two rotating shafts inside the static storage cover, respectively. The end of each second connecting shaft sequentially penetrates the static storage cover and the fixed frame and extends to the outside thereof and is fixedly connected to a second gear;

[0029] Two second racks are respectively slidably connected to the side walls of the fixed frame, the two second racks are respectively meshed with the two second gears, the front second rack is located above the second gear, and the rear second rack is located below the second gear;

[0030] The two linkage components are respectively arranged at the ends of the two first connecting shafts. When the first connecting shafts move along the inner wall of the yielding opening, the second rack is pulled to move by the linkage components.

[0031] Preferably, the linkage component comprises:

[0032] A linkage plate, slidably connected to the top of the fixed frame, and a rotation hole is opened on the surface of the linkage plate;

[0033] A linkage shaft, fixedly connected to the end of the first connection shaft, and the linkage shaft is rotatably connected to the inner wall of the rotating hole;

[0034] The pulling plate is fixedly connected to the end of the second rack, and the end of the pulling plate is fixedly connected to the surface of the linkage plate.

[0035] Preferably, the gas delivery mechanism includes a gas tank, which is fixedly connected to the top of the support plate, and an air pump is installed on the surface of the gas tank. The air inlet pipe of the air pump is fixedly connected to the gas tank, and the air outlet pipe of the air pump is fixedly connected to a three-way joint. The two pipe openings on the three-way joint are fixedly connected to a gas delivery hose, and the two gas delivery hoses are fixedly connected to the inside of a static storage cover and a dynamic storage cover, respectively.

[0036] Preferably, the control method of the controller comprises the following steps:

[0037] The detection unit detects the thickness of the strip and generates thickness information;

[0038] The detection unit sends the thickness information to the controller, and each piece of thickness information corresponds to a control message to control the adaptive adjustment of the airflow blowing mechanism to achieve airflow sealing.

[0039] Preferably, the control method of the controller further includes:

[0040] After receiving the thickness information, the controller generates control information;

[0041] The controller sends control information to the electric cylinder to control the operation of the electric cylinder. The piston rod of the electric cylinder pulls the dynamic storage cover to move, so as to adjust the distance between the dynamic storage cover and the lower surface of the strip.

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] 1. The gas conveying mechanism conveys the inert gas to the inside of the static storage hood and the dynamic storage hood, and sprays it out from the air outlet on the surface of the static storage hood and the dynamic storage hood. The sprayed inert gas will blow away the air on the surface of the strip, forming a protective layer between the static storage hood and the dynamic storage hood, isolating the external air from entering the galvanizing pool, and realizing contactless sealing. In order to maintain the stability of the protective layer, the distance between the static storage hood and the dynamic storage hood and the two sides of the strip is consistent. If the thickness of the conveyed strip increases, when the strip passes through the conveyor roller, the distance from the lower surface of the strip to the dynamic storage hood is shortened relative to the distance from the upper surface of the strip to the static storage hood. In order to facilitate the thicker strip to pass smoothly between the static storage hood and the dynamic storage hood to complete galvanizing, a detection unit is set to detect the thickness of the strip to be galvanized in advance. According to the detection of the detection unit The controller controls the pulling mechanism to move, thereby driving the dynamic storage cover to move, adjusting the distance between the dynamic storage cover and the lower surface of the strip, maintaining the distance between the dynamic storage cover and the static storage cover on both sides of the strip to be consistent, and maintaining the stability of the protective layer while the thickness of the strip changes. During the movement of the dynamic storage cover, the adjusting mechanism will also be linked to expand the size of the air outlet on the surface of the dynamic storage cover and the static storage cover. Therefore, when galvanizing a thick strip, the air outlet will be automatically expanded during the process of adaptively adjusting the position of the dynamic storage cover, which is conducive to a more uniform distribution of the inert gas and improves the purge efficiency. It ensures that the gas can penetrate the gas layer on the surface of the strip, helps to increase the gas coverage of the entire strip surface, and reduces the occurrence of local air stagnation due to uneven gas distribution due to increased strip thickness.

[0044] 2. During the movement of the dynamic storage cover, the rotating parts will be linked to drive the two rotating shafts on the side wall of the fixed plate to rotate in the opposite direction. If the detection unit detects that the thickness of the strip to be galvanized becomes thicker, the distance between the lower surface of the strip and the dynamic storage cover will be shortened. In order to maintain the same distance between the two sides of the strip reaching the dynamic storage cover and the static storage cover, facilitate the smooth passage of the strip, and maintain the stability of the gas protection layer, the controller will generate instructions to control the pulling mechanism to pull the dynamic storage cover to move inside the installation slot, increase the distance between the dynamic storage cover and the lower surface of the strip, so that the two sides of the strip reach the dynamic storage cover and the static storage cover. The distance between the covers is restored to be consistent; during the movement of the dynamic storage cover, the linkage rotating component drives the two rotating shafts on the side walls of the fixed plate to rotate in the opposite direction, and under the connection of the connecting plate, drives the two arc-shaped plates on the inner walls of the dynamic storage cover and the static storage cover to rotate in the opposite direction, thereby adaptively expanding the size of the gas outlet, which is conducive to a more uniform distribution of the inert gas and improves the purge efficiency. When facing thicker strip steel, it ensures that the gas can penetrate the gas layer on the surface of the strip steel, which helps to increase the gas coverage of the entire strip steel surface, improve the sealing effect, and reduce local air retention caused by uneven gas distribution. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0046] Figure 2 It is a cross-sectional view of the galvanizing pool of the present invention;

[0047] Figure 3 This is a structural schematic diagram of the connection between the fixing frame and the support plate of the present invention;

[0048] Figure 4 It is a cross-sectional view of the fixing frame of the present invention;

[0049] Figure 5 It is a structural schematic diagram of the connection between the second rack and the pulling plate of the present invention;

[0050] Figure 6 This is a schematic structural diagram of the connection between the first connecting shaft and the first gear of the present invention;

[0051] Figure 7 It is a structural schematic diagram of the connection between the linkage plate and the linkage shaft of the present invention;

[0052] Figure 8 It is a schematic diagram of the structure of the opening of the yield port of the present invention;

[0053] Fig. 9 The process flow chart of the method of the present invention is as follows;

[0054] Fig.10 It is a front view of the hot-dip galvanizing device of the present invention.

[0055] In the figure: 1. galvanizing pool; 2. support plate; 201. input port; 202. output port; 3. conveying roller; 4. fixing frame; 5. static storage cover; 6. dynamic storage cover; 7. air outlet; 8. mounting groove; 9. electric cylinder; 10. sealing plate; 11. fixing plate; 12. rotating shaft; 13. connecting plate; 14. arc plate; 15. yielding port; 16. first connecting shaft; 17. first gear; 18. first rack; 19. second connecting shaft; 20. second gear; 21. second rack; 22. linkage plate; 23. linkage shaft; 24. pulling plate; 25. gas storage tank; 26. air pump; 27. gas delivery hose. DETAILED DESCRIPTION

[0056] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0057] like Figures 1 to 10 A production process for galvanized steel strip shown in the figure comprises the following steps:

[0058] Step 1: Surface treatment of steel strip: pickling, degreasing and surface activation of the steel strip to remove oxides, grease and impurities on the surface;

[0059] Step 2: Pretreatment of steel strip: Immerse the surface treated steel strip in the pretreatment tank for further rust removal and cleaning to ensure the cleanliness of the steel strip surface;

[0060] Step 3: Hot-dip galvanizing: The strip steel in the conveying process is hot-dip galvanized by the hot-dip galvanizing device;

[0061] Step 4: Post-processing: Quality inspection of galvanized steel strip;

[0062] The hot-dip galvanizing device in step 3 includes a galvanizing pool 1, a support plate 2 is fixedly connected to the inner wall of the galvanizing pool 1, and conveying rollers 3 are symmetrically arranged on the inner wall of the galvanizing pool 1. The hot-dip galvanizing device also includes:

[0063] A detection unit, arranged on the side wall of the hot-dip galvanizing device, is used to detect the thickness of the strip steel;

[0064] An input port 201 and an output port 202 are symmetrically arranged on the top of the support plate 2. An airflow blowing mechanism is arranged at both the input port 201 and the output port 202. The airflow blowing mechanism is used to prevent external air from entering the interior of the galvanizing pool 1.

[0065] The controller controls the two air flow blowing mechanisms to adjust adaptively to achieve air flow sealing according to the strip thickness detected by the detection unit;

[0066] The airflow blowing mechanism comprises:

[0067] A fixed frame 4 is fixedly connected to the top of the support plate 2, a static storage cover 5 is fixedly connected to the inner wall of the fixed frame 4, and a dynamic storage cover 6 is also arranged on the inner wall of the fixed frame 4 through a pulling mechanism, and air outlets 7 are provided on the surfaces of the static storage cover 5 and the dynamic storage cover 6;

[0068] The adjusting mechanism is arranged on the side wall of the fixing frame 4. When the pulling mechanism is in operation, the adjusting mechanism is linked to adjust the size of the two air outlets 7.

[0069] The gas conveying mechanism is arranged on the top of the support plate 2, and is used to convey inert gas to the static storage cover 5 and the dynamic storage cover 6. When working, one end of the strip is conveyed from the input port 201 to the inside of the galvanizing pool 1, and is transmitted by two conveying rollers 3 and output from the output port 202. The zinc liquid in the galvanizing pool 1 will galvanize the surface of the strip. Since the strip may cause oxidation reaction when it contacts with the zinc liquid during the hot-dip galvanizing process, an airflow blowing mechanism is arranged at the input port 201 and the output port 202. The airflow blowing mechanism will blow out inert gas. As the inert gas continues to increase, the air inside the galvanizing pool 1 will gradually decrease, thereby reducing the oxidation reaction of the strip during the galvanizing process, and the excess inert gas is discharged from the input port 201 and the output port 2 02 is discharged, which is conducive to maintaining the stability of the gas environment inside the galvanizing pool 1. At the same time, during the galvanizing process, the inert gas flow discharged outward from the input port 201 and the output port 202 is conducive to blowing away the gas on the surface of the strip steel, and can create a protective layer at the input port 201 and the output port 202 to cover the surface of the strip steel, reduce the contact between air and the strip steel, and prevent external air from entering the interior of the galvanizing pool 1. The interior of the galvanizing pool 1 is sealed by the flow of gas. Therefore, airflow blowing mechanisms are set at the input port 201 and the output port 202 to help control the flow of gas, ensure that the surface of the strip steel is covered by the gas protective layer throughout the galvanizing process, reduce the contact of the strip steel with air in the process of entering and leaving the zinc liquid, and avoid oxidation;

[0070] The specific process of the airflow blowing mechanism blowing out the inert gas is as follows: the gas conveying mechanism conveys the inert gas to the inside of the static storage cover 5 and the dynamic storage cover 6, and sprays it out from the air outlet 7 on the surface of the static storage cover 5 and the dynamic storage cover 6. The sprayed inert gas will blow away the air on the surface of the strip, and form a protective layer between the static storage cover 5 and the dynamic storage cover 6 to isolate the outside air from entering the galvanizing pool 1, thereby realizing contactless sealing. In order to maintain the stability of the protective layer, the static storage cover 5 and the dynamic storage cover 6 are at the same distance from both sides of the strip. If the thickness of the conveyed strip increases, when the strip passes through the conveyor roller 3, the distance from the lower surface of the strip to the dynamic storage cover 6 is shortened relative to the distance from the upper surface of the strip to the static storage cover 5. In order to facilitate the thicker strip to pass smoothly between the static storage cover 5 and the dynamic storage cover 6 to complete galvanizing, a detection unit is set to detect the thickness of the strip to be galvanized in advance. Detection, according to the detection situation of the detection unit, the controller controls the pulling mechanism to operate, thereby driving the dynamic storage cover 6 to move, adjusting the distance between the dynamic storage cover 6 and the lower surface of the strip, maintaining the distance between the dynamic storage cover 6 and the static storage cover 5 on both sides of the strip to be consistent, and maintaining the stability of the protective layer while the thickness of the strip changes. In the process of moving the dynamic storage cover 6, the adjustment mechanism will be linked to expand the size of the air outlet 7 on the surface of the dynamic storage cover 6 and the static storage cover 5. Therefore, when galvanizing a thick strip, in the process of adaptively adjusting the position of the dynamic storage cover 6, the air outlet 7 is automatically expanded, which is conducive to a more uniform distribution of the inert gas, improves the purge efficiency, ensures that the gas can penetrate the gas layer on the surface of the strip, helps to improve the gas coverage of the entire strip surface, and reduces the occurrence of local air stagnation caused by uneven gas distribution due to increased strip thickness;

[0071] The detection unit can use an ultrasonic thickness gauge to detect the thickness of the strip steel, and the controller can be connected to the device in an external manner to control the control element.

[0072] As an embodiment of the present invention, the pulling mechanism includes:

[0073] The mounting groove 8 is provided on the side wall of the fixing frame 4, and an electric cylinder 9 is fixedly installed inside the mounting groove 8, and the piston rod end of the electric cylinder 9 is fixedly connected to the dynamic storage cover 6;

[0074] The sealing plate 10 is slidably connected to the inner bottom surface of the mounting groove 8, and the end of the sealing plate 10 is fixedly connected to the side wall of the dynamic storage cover 6, and the side wall of the sealing plate 10 is in sealing contact with the inner wall of the mounting groove 8; when working, when the electric cylinder 9 receives the control of the controller, the electric cylinder 9 is started, and the piston rod of the electric cylinder 9 will operate according to the control command of the controller. During the operation of the piston rod of the electric cylinder 9, the dynamic storage cover 6 connected with the sealing plate 10 will be pulled to move, thereby adjusting the distance between the dynamic storage cover 6 and the static storage cover 5. When strip steels of different thicknesses pass between the dynamic storage cover 6 and the static storage cover 5, the distance between the dynamic storage cover 6 and the static storage cover 5 to the surface of the strip steel is maintained to be consistent, thereby maintaining the stability of the gas protection layer. The sealing plate 10 is arranged to facilitate the sealing between the dynamic storage cover 6 and the mounting groove 8 during the movement of the dynamic storage cover 6, so as to avoid the situation where external air enters the galvanizing pool 1 due to the space created by the movement of the dynamic storage cover 6;

[0075] The conveyor roller 3 arranged inside the galvanizing pool 1 will convey the strip. Since the position of the conveyor roller 3 is fixed, the distance from the upper surface of the strip to the static storage cover 5 is unchanged. The change in the thickness of the strip will only affect the distance from the lower surface of the strip to the dynamic storage cover 6. Therefore, when the thickness of the strip changes, it is only necessary to adaptively adjust the position of the dynamic storage cover 6.

[0076] As an embodiment of the present invention, the adjustment mechanism includes:

[0077] Two fixed plates 11 are respectively fixedly connected to the inner wall of the dynamic storage cover 6 and the static storage cover 5. A rotating shaft 12 is symmetrically connected to the side wall of each fixed plate 11. A connecting plate 13 is fixedly connected to the surface of each rotating shaft 12. An arc plate 14 is fixedly connected to the end of each connecting plate 13. Each arc plate 14 is slidably connected to the inner wall of the dynamic storage cover 6 or the static storage cover 5.

[0078] The rotating component is arranged on the side wall of the fixed frame 4. During the movement of the dynamic storage cover 6, the linkage rotating component drives the two rotating shafts 12 on the side wall of each fixed plate 11 to rotate in the opposite direction, so as to adjust the size of the air outlet 7. During operation, during the movement of the dynamic storage cover 6, the linkage rotating component drives the two rotating shafts 12 on the side wall of the fixed plate 11 to rotate in the opposite direction. If the detection unit detects that the thickness of the strip to be galvanized becomes thicker, the distance between the lower surface of the strip and the dynamic storage cover 6 will be shortened. In order to maintain the same distance between the two sides of the strip reaching the dynamic storage cover 6 and the static storage cover 5, facilitate the smooth passage of the strip, and maintain the stability of the gas protection layer, the controller will generate instructions to control the pulling mechanism to pull the dynamic storage cover 6 to move into the installation groove 8, increase the distance between the dynamic storage cover 6 and the lower surface of the strip, so that the distance between the two sides of the strip reaching the dynamic storage cover 6 and the static storage cover 5 is restored to be consistent;

[0079] During the movement of the dynamic storage cover 6, the interlocking rotating parts drive the two rotating shafts 12 on the side walls of the fixed plate 11 to rotate in the opposite direction, and under the connection of the connecting plate 13, drive the two arc plates 14 on the inner walls of the dynamic storage cover 6 and the static storage cover 5 to rotate in the opposite direction, thereby adaptively expanding the size of the gas outlet 7, which is conducive to a more uniform distribution of the inert gas and improves the purge efficiency. When facing thicker strip steel, it ensures that the gas can penetrate the gas layer on the surface of the strip steel, which helps to increase the gas coverage rate of the entire strip steel surface, improve the sealing effect, and reduce local air retention caused by uneven gas distribution.

[0080] As an embodiment of the present invention, the rotating component includes:

[0081] Two clearance openings 15 are symmetrically formed on the inner wall of the fixing frame 4;

[0082] Two first connecting shafts 16 are respectively fixedly connected to the ends of the two rotating shafts 12 inside the dynamic storage cover 6. The ends of the two first connecting shafts 16 penetrate the dynamic storage cover 6 and pass through the adjacent clearance openings 15 and are fixedly connected to the first gears 17.

[0083] Two first racks 18 are fixedly connected to two sides of the fixed frame 4, respectively. The two first racks 18 are meshed with the two first gears 17, respectively. The front first rack 18 is located above the first gear 17, and the rear first rack 18 is located below the first gear 17;

[0084] Two second connecting shafts 19 are rotatably connected to the side walls of the fixed frame 4, and the two second connecting shafts 19 are fixedly connected to the two rotating shafts 12 inside the static storage cover 5, respectively. The end of each second connecting shaft 19 passes through the static storage cover 5 and the fixed frame 4 in sequence and extends to the outside thereof, and is fixedly connected to a second gear 20;

[0085] Two second racks 21 are slidably connected to the side walls of the fixed frame 4, and the two second racks 21 are respectively meshed with the two second gears 20, the front second rack 21 is located above the second gear 20, and the rear second rack 21 is located below the second gear 20;

[0086] Two linkage components are respectively arranged at the ends of the two first connecting shafts 16. When the first connecting shaft 16 moves along the inner wall of the clearance opening 15, the second rack 21 is pulled to move by the linkage components. When working, when the dynamic storage cover 6 moves into the installation groove 8, the first connecting shaft 16 connected to the first gear 17 is driven to move along the inner wall of the clearance opening 15 by the rotating shaft 12 inside the dynamic storage cover 6. Under the transmission of the two first racks 18, the first gear 17 on the front and rear sides of the fixed frame 4 is prompted to rotate in the opposite direction, thereby driving the two first connecting shafts 16 on the surface of the dynamic storage cover 6 to rotate in the opposite direction, so that the two rotating shafts 12 inside the dynamic storage cover 6 rotate in the opposite direction, thereby pulling the two arc plates 14 inside the dynamic storage cover 6 to rotate in the opposite direction along the inner wall of the dynamic storage cover 6, slowly expanding the size of the air outlet 7 on the surface of the dynamic storage cover 6, and increasing the gas flow rate ejected from the air outlet 7. In the process of galvanizing thicker strip steel, the gas The distribution may be more uniform, which is helpful to improve the gas coverage rate of the entire strip surface and reduce local air retention caused by uneven gas distribution. Since linkage components are provided at the ends of the two first connecting shafts 16, when the first connecting shaft 16 moves along the inner wall of the yield port 15, the two second racks 21 are pulled to move by the linkage components, thereby prompting the two second gears 20 to rotate in the opposite direction. Under the connection of the two second connecting shafts 19, the two rotating shafts 12 inside the static storage cover 5 are driven to rotate in the opposite direction, and the two arc plates 14 inside the static storage cover 5 are driven to rotate in the opposite direction along the inner wall of the static storage cover 5, thereby expanding the size of the gas outlet 7 on the surface of the static storage cover 5 and increasing the gas flow rate ejected from the gas outlet 7; it is beneficial to make the inert gas more evenly distributed, improve the purge efficiency, ensure that the gas can penetrate the gas layer on the surface of the strip, help improve the gas coverage rate of the entire strip surface and reduce local air retention caused by uneven gas distribution.

[0087] As an embodiment of the present invention, the linkage component includes:

[0088] The linkage plate 22 is slidably connected to the top of the fixed frame 4, and a rotation hole is opened on the surface of the linkage plate 22;

[0089] A linkage shaft 23 is fixedly connected to the end of the first connection shaft 16, and the linkage shaft 23 is rotatably connected to the inner wall of the rotating hole;

[0090] The pulling plate 24 is fixedly connected to the end of the second rack 21, and the end of the pulling plate 24 is fixedly connected to the surface of the linkage plate 22; during operation, when the thickness of the strip increases, the dynamic storage cover 6 moves into the installation groove 8, and under the connection between the rotating shaft 12 inside the dynamic storage cover 6 and the first connecting shaft 16, the pulling linkage shaft 23 is synchronously moved laterally, thereby driving the linkage plate 22 connected to the pulling plate 24 to slide along the top of the fixed frame 4, and the second rack 21 is pulled to move by the pulling plate 24. Under the transmission of the second rack 21, the second gear 20 connected to the surface of the second connecting shaft 19 is caused to rotate. Therefore, in the process of the first gear 17 moving laterally and rotating, the second gear 20 is synchronously linked to rotate, and the size of the air outlet 7 on the surface of the dynamic storage cover 6 and the static storage cover 5 is synchronously changed, and the gas flow on both sides of the strip is synchronously increased to maintain the stability of the gas protection layer.

[0091] As an embodiment of the present invention, the gas delivery mechanism includes a gas tank 25, which is fixedly connected to the top of the support plate 2. An air pump 26 is installed on the surface of the gas tank 25. The air inlet pipe of the air pump 26 is fixedly connected to the gas tank 25, and the air outlet pipe of the air pump 26 is fixedly connected to a three-way joint. The two pipe openings on the three-way joint are fixedly connected to a gas hose 27. The two gas hoses 27 are respectively fixedly connected to the inside of the static storage cover 5 and the dynamic storage cover 6. When working, the set gas tank 25 is convenient for storing inert gas, and the set air pump 26 is convenient for conveying the inert gas inside the gas tank 25 to the inside of the dynamic storage cover 6 and the static storage cover 5 through the gas hose 27, and discharged from the outlet 7. With the help of the sprayed inert gas, the airflow sealing effect is achieved.

[0092] As an embodiment of the present invention, the control method of the controller includes the following steps:

[0093] The detection unit detects the thickness of the strip and generates thickness information;

[0094] The detection unit sends the thickness information to the controller, and each piece of thickness information corresponds to a control message to control the adaptive adjustment of the airflow blowing mechanism to achieve airflow sealing.

[0095] As an embodiment of the present invention, the control method of the controller further includes:

[0096] After receiving the thickness information, the controller generates control information;

[0097] The controller sends control information to the electric cylinder 9 to control the operation of the electric cylinder 9. The piston rod of the electric cylinder 9 pulls the dynamic storage cover 6 to move so as to adjust the distance between the dynamic storage cover 6 and the lower surface of the strip.

[0098] Working principle of the present invention: one end of the steel strip is transported from the input port 201 to the inside of the galvanizing pool 1, and is transmitted by two conveying rollers 3 and output from the output port 202. The zinc liquid in the galvanizing pool 1 will galvanize the surface of the steel strip. Since the steel strip may cause an oxidation reaction when it contacts the zinc liquid during the hot-dip galvanizing process, an airflow blowing mechanism is provided at the input port 201 and the output port 202. The airflow blowing mechanism will blow out an inert gas. As the inert gas continues to increase, the air inside the galvanizing pool 1 will gradually decrease, thereby reducing the oxidation reaction of the steel strip during the galvanizing process. In addition, the excess inert gas is discharged from the input port 201 and the output port 202, which is conducive to maintaining the gas inside the galvanizing pool 1. The environment is stable. At the same time, during the galvanizing process, the inert gas flow discharged outward from the input port 201 and the output port 202 is conducive to blowing away the gas on the surface of the strip, and a protective layer can be created at the input port 201 and the output port 202 to cover the surface of the strip, thereby reducing the contact between air and the strip, and preventing external air from entering the interior of the galvanizing pool 1. The interior of the galvanizing pool 1 is sealed by the flow of gas. Therefore, airflow blowing mechanisms are provided at the input port 201 and the output port 202 to help control the flow of gas, thereby ensuring that the surface of the strip is covered by the gas protective layer throughout the galvanizing process, thereby reducing the contact of the strip with air during the process of entering and leaving the zinc liquid, and avoiding oxidation.

[0099] The specific process of the airflow blowing mechanism blowing out the inert gas is as follows: the gas conveying mechanism conveys the inert gas to the inside of the static storage cover 5 and the dynamic storage cover 6, and sprays it out from the air outlet 7 on the surface of the static storage cover 5 and the dynamic storage cover 6. The sprayed inert gas will blow away the air on the surface of the strip, and form a protective layer between the static storage cover 5 and the dynamic storage cover 6 to isolate the outside air from entering the galvanizing pool 1, thereby realizing contactless sealing. In order to maintain the stability of the protective layer, the static storage cover 5 and the dynamic storage cover 6 are at the same distance from both sides of the strip. If the thickness of the conveyed strip increases, when the strip passes through the conveyor roller 3, the distance from the lower surface of the strip to the dynamic storage cover 6 is shortened relative to the distance from the upper surface of the strip to the static storage cover 5. In order to facilitate the thicker strip to pass smoothly between the static storage cover 5 and the dynamic storage cover 6 to complete galvanizing, a detection unit is set to detect the thickness of the strip to be galvanized in advance. Detection, according to the detection situation of the detection unit, the pulling mechanism is controlled by the controller to operate, thereby driving the dynamic storage cover 6 to move, adjusting the distance between the dynamic storage cover 6 and the lower surface of the strip, maintaining the distance between the dynamic storage cover 6 and the static storage cover 5 on both sides of the strip to be consistent, and maintaining the stability of the protective layer while the thickness of the strip changes. In the process of moving the dynamic storage cover 6, the adjustment mechanism will also be linked to expand the size of the air outlet 7 on the surface of the dynamic storage cover 6 and the static storage cover 5. Therefore, when galvanizing a thick strip, in the process of adaptively adjusting the position of the dynamic storage cover 6, the air outlet 7 is automatically expanded, which is conducive to a more uniform distribution of the inert gas, improves the purge efficiency, ensures that the gas can penetrate the gas layer on the surface of the strip, helps to improve the gas coverage of the entire strip surface, and reduces the occurrence of local air stagnation caused by uneven gas distribution due to increased strip thickness.

[0100] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention, and these changes and improvements fall within the scope of the present invention claimed.

Claims

1. A production process for galvanized steel strip, characterized in that: The steps include: Step 1: Surface treatment of steel strip: pickling, degreasing and surface activation of the steel strip to remove oxides, grease and impurities on the surface; Step 2: Pretreatment of steel strip: Immerse the surface treated steel strip in the pretreatment tank for further rust removal and cleaning to ensure the cleanliness of the steel strip surface; Step 3: Hot-dip galvanizing: The strip steel in the conveying process is hot-dip galvanized by the hot-dip galvanizing device; Step 4: Post-processing: Quality inspection of galvanized steel strip; The hot-dip galvanizing device in step 3 comprises a galvanizing pool (1), a support plate (2) is fixedly connected to the inner wall of the galvanizing pool (1), and conveying rollers (3) are symmetrically arranged on the inner wall of the galvanizing pool (1). The hot-dip galvanizing device also comprises: A detection unit, arranged on the side wall of the hot-dip galvanizing device, for detecting the thickness of the steel strip; An input port (201) and an output port (202), the input port (201) and the output port (202) are symmetrically arranged on the top of the support plate (2), and an airflow blowing mechanism is arranged at each of the input port (201) and the output port (202), and the airflow blowing mechanism is used to prevent external air from entering the interior of the galvanizing pool (1); The controller controls the two air flow blowing mechanisms to adjust adaptively to achieve air flow sealing according to the strip thickness detected by the detection unit; The airflow blowing mechanism comprises: A fixed frame (4) is fixedly connected to the top of the support plate (2); a static storage cover (5) is fixedly connected to the inner wall of the fixed frame (4); and a dynamic storage cover (6) is also arranged on the inner wall of the fixed frame (4) via a pulling mechanism; and air outlets (7) are provided on the surfaces of the static storage cover (5) and the dynamic storage cover (6); An adjustment mechanism is arranged on the side wall of the fixed frame (4), and during the operation of the pulling mechanism, the linkage adjustment mechanism adjusts the size of the two air outlets (7); A gas delivery mechanism, arranged on the top of the support plate (2), and used for delivering inert gas to the interior of the static storage cover (5) and the dynamic storage cover (6); According to the detection situation of the detection unit, the pulling mechanism is controlled by the controller to operate, thereby driving the dynamic storage cover (6) to move, adjusting the distance between the dynamic storage cover (6) and the lower surface of the strip, and maintaining the distance between the dynamic storage cover (6) and the static storage cover (5) on both sides of the strip to be consistent. When the thickness of the strip changes, the stability of the protective layer can also be maintained. During the movement of the dynamic storage cover (6), the adjustment mechanism will be linked to expand the size of the air outlet (7) on the surface of the dynamic storage cover (6) and the static storage cover (5).

2. A production process for galvanized steel strip according to claim 1, characterized in that: The pulling mechanism comprises: A mounting groove (8) is provided on a side wall of the fixing frame (4), an electric cylinder (9) is fixedly mounted inside the mounting groove (8), and an end of a piston rod of the electric cylinder (9) is fixedly connected to the dynamic storage cover (6); A sealing plate (10) is slidably connected to the inner bottom surface of the mounting groove (8), an end of the sealing plate (10) is fixedly connected to the side wall of the dynamic storage cover (6), and the side wall of the sealing plate (10) is in sealing contact with the inner wall of the mounting groove (8).

3. A production process for galvanized steel strip according to claim 1, characterized in that: The regulating mechanism comprises: Two fixed plates (11) are respectively fixedly connected to the inner walls of the dynamic storage cover (6) and the static storage cover (5); a rotating shaft (12) is symmetrically connected to the side wall of each fixed plate (11); a connecting plate (13) is fixedly connected to the surface of each rotating shaft (12); an arc-shaped plate (14) is fixedly connected to the end of each connecting plate (13); and each arc-shaped plate (14) is slidably connected to the inner wall of the dynamic storage cover (6) or the static storage cover (5); The rotating component is arranged on the side wall of the fixed frame (4). When the dynamic storage cover (6) moves, the linkage rotating component drives two rotating shafts (12) on the side wall of each fixed plate (11) to rotate in opposite directions, thereby adjusting the size of the air outlet (7).

4. A production process for galvanized steel strip according to claim 3, characterized in that: The rotating component comprises: Two clearance openings (15) are symmetrically formed on the inner wall of the fixing frame (4); Two first connecting shafts (16) are respectively fixedly connected to the ends of the two rotating shafts (12) inside the dynamic storage cover (6); the ends of the two first connecting shafts (16) penetrate the dynamic storage cover (6) and pass through the adjacent clearance openings (15) and are fixedly connected to the first gear (17); Two first racks (18) are respectively fixedly connected to two sides of the fixed frame (4), the two first racks (18) are respectively meshed with the two first gears (17), the front first rack (18) is located above the first gear (17), and the rear first rack (18) is located below the first gear (17); Two second connecting shafts (19) are rotatably connected to the side walls of the fixed frame (4), and the two second connecting shafts (19) are respectively fixedly connected to the two rotating shafts (12) inside the static storage cover (5), and the end of each second connecting shaft (19) passes through the static storage cover (5) and the fixed frame (4) in sequence and extends to the outside thereof and is fixedly connected to a second gear (20); Two second racks (21) are respectively slidably connected to the side walls of the fixed frame (4), the two second racks (21) are respectively meshed with the two second gears (20), the front second rack (21) is located above the second gear (20), and the rear second rack (21) is located below the second gear (20); Two linkage components are respectively arranged at the ends of the two first connecting shafts (16). When the first connecting shaft (16) moves along the inner wall of the clearance opening (15), the second rack (21) is pulled to move by the linkage components.

5. A production process for galvanized steel strip according to claim 4, characterized in that: The linkage component comprises: A linkage plate (22) is slidably connected to the top of the fixed frame (4), and a rotation hole is provided on the surface of the linkage plate (22); A linkage shaft (23) is fixedly connected to the end of the first connection shaft (16), and the linkage shaft (23) is rotatably connected to the inner wall of the rotating hole; The pulling plate (24) is fixedly connected to the end of the second rack (21), and the end of the pulling plate (24) is fixedly connected to the surface of the linkage plate (22).

6. A production process for galvanized steel strip according to claim 1, characterized in that: The gas delivery mechanism comprises a gas storage tank (25), the gas storage tank (25) being fixedly connected to the top of the support plate (2), an air pump (26) being mounted on the surface of the gas storage tank (25), an air inlet pipe of the air pump (26) being fixedly connected to the gas storage tank (25), an air outlet pipe of the air pump (26) being fixedly connected to a three-way joint, two pipe openings on the three-way joint being fixedly connected to a gas delivery hose (27), and the two gas delivery hoses (27) being fixedly connected to the inside of a static storage cover (5) and a dynamic storage cover (6), respectively.

7. A production process for galvanized steel strip according to claim 2, characterized in that: The control method of the controller comprises the following steps: The detection unit detects the thickness of the strip and generates thickness information; The detection unit sends the thickness information to the controller, and each piece of thickness information corresponds to a control message to control the adaptive adjustment of the airflow blowing mechanism to achieve airflow sealing.

8. A production process for galvanized steel strip according to claim 7, characterized in that: The control method of the controller also includes: After receiving the thickness information, the controller generates control information; The controller sends control information to the electric cylinder (9) to control the operation of the electric cylinder (9), and the piston rod of the electric cylinder (9) pulls the dynamic storage cover (6) to move, so as to adjust the distance between the dynamic storage cover (6) and the lower surface of the strip.

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