High-yield annealing and pickling preparation method of stainless steel

Abstract

The invention discloses a high-yield annealing and pickling preparation method of stainless steel, which comprises the following steps: S1, solution annealing, S2, mechanical descaling: mechanically crushing a rust layer on the surface layer of a steel strip by adopting a withdrawal and straightening descaling device and a shot blasting device; s3, HF + HNO3 mixed acid pickling is carried out; and S4, re-brushing equipment is put into use, and the plate surface is pre-ground. According to the device, annealing and pickling loss can be reduced, annealing burning loss is reduced, the yield is increased, the product roughness is reduced, the subsequent machining effect of a whole roll of mirror boards is guaranteed, meanwhile, under cooperation of the bearing frame, the collecting frame, the transmission mechanism, the bearing mechanism and the connecting mechanism, the boards are driven to shake, the dead angles of pickling of the boards are reduced, pickling is more comprehensive, and the production efficiency is improved. The pickling tank is simple in structure, convenient to use, capable of cleaning iron rust for pickling in time, capable of improving the pickling efficiency and quality of pickling liquid in the pickling tank, capable of preventing rust slag from being accumulated in the pickling tank and blocking the pickling tank, capable of slowing down the consumption speed of the pickling liquid, capable of prolonging the service life of the pickling liquid and capable of reducing cost.

Description

Technical Field

[0001] The invention relates to the technical field related to stainless steel processing, and in particular to a high yield rate annealing and pickling preparation method for stainless steel. Background Art

[0002] In actual industrial production, compared with ordinary 304 steel, the yield rate of hot acid stripping nickel-saving austenitic stainless steel is low and the roughness is high, which seriously affects the company's benefits and the subsequent mirror plate processing effect. In order to improve the yield rate of steel strip, in actual production, most companies use methods such as directly reducing the annealing temperature to reduce oxidation loss, or directly reducing the acid concentration to reduce acid corrosion loss to improve the yield rate of steel strip; The method of directly reducing the annealing temperature cannot guarantee the mechanical properties of the material and affects the subsequent processing. The method of directly reducing the acid concentration makes the plate parts placed in the pickling tank by hoisting, which is not only easy to cause poor pickling of the plate surface, rust spots remain, and cannot meet the requirements of the plate surface for the thickness mirror plate processing. As the number of pickled plates increases, a large amount of rust residue will inevitably accumulate at the bottom of the pickling tank. If these rust residues cannot be cleaned away in time, they will inevitably block the drainage port of the pickling tank, affecting the subsequent normal use of the pickling tank. In addition, these rust residues need to be salvaged manually when cleaning. The salvage workers may cause acid splashes during the salvage process, which may affect the health of the salvage workers and is relatively inconvenient. Summary of the invention

[0003] The object of the present invention is to provide a method for preparing stainless steel by annealing and pickling with a high yield rate, so as to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above object, the present invention provides the following technical solution: a method for preparing stainless steel by annealing and pickling with a high yield rate, comprising the following steps: S1: Solution annealing, using continuous annealing heating furnace with segmented temperature control, low temperature zone 900 ~ 1000 ℃, high temperature zone 1140 ~ 1190 ℃, TV value within 240; S2: Mechanical descaling, using a tension and descaling device and a shot blasting device to mechanically break the rust layer on the surface of the steel strip; S3: Pickling in a pickling device using HF+HNO3 mixed acid, HNO3 concentration 80-100 g / l, HF concentration 2-8 g / l, pickling temperature 45-55°C, pickling time ≥100S; S4: Put the rebrushing equipment into use to pre-grind the board surface.

[0005] Preferably, in step S2, the tension of the straightening and descaling is 200-220 / KN, the downward pressure of the straightening rod is 75-85 mm, the current of the shot blasting chamber is 70-90 A, and the rotation speed of the blasting head is 800-1200 rpm.

[0006] The present invention also provides a high yield annealing pickling device for stainless steel, comprising a pickling tank, wherein a heating component for controlling the temperature of the acid solution is arranged inside the pickling tank, a top cover is arranged at the top of the pickling tank, and a pickling device is arranged between the top cover and the pickling tank, wherein the pickling device comprises: A carrying frame, wherein the carrying frame is arranged inside the pickling tank; A collection frame, the collection frame is arranged below the carrying frame; A transmission mechanism, which is arranged inside the top cover and is used to drive the bearing frame to move up and down; A bearing mechanism, which is arranged inside the pickling tank and is used to fix the collecting frame and drive the bearing frame to move left and right; A connecting mechanism is arranged between the carrying frame and the collecting frame.

[0007] Preferably, the transmission mechanism comprises: A motor, wherein the motor is fixedly mounted on the top of the top cover; A transmission rod, two ends of which are rotatably arranged on two sides of the inner wall of the top cover; Eccentric wheels, wherein a plurality of the eccentric wheels are fixedly and interlacedly connected with the transmission rod, the plurality of the eccentric wheels are staggered and symmetrically arranged, and the eccentric wheels cooperate with the bearing mechanism; A squeezing roller, wherein the squeezing roller is fixedly connected to the transmission rod and interlaced with the transmission rod, and the cross section of the squeezing roller is elliptical; A lifting component is arranged at the top of the carrying frame.

[0008] Preferably, the lifting assembly comprises: A slide rod, wherein slide grooves are provided on both sides of the inner wall of the top cover, and the two ends of the slide rod are respectively fixedly connected to the top and bottom ends of the inner wall of the slide groove; A lifting plate, wherein the lifting plate is slidably and interlacedly connected with a plurality of sliding rods, and the lifting plate cooperates with the squeezing roller; A slider, wherein a plurality of sliding grooves are provided inside the lifting plate, and the slider is slidably interlaced with the inner cavity of the sliding groove; A fixing rod, one end of each of the fixing rods is fixedly connected to the bearing frame, and the other end of each of the fixing rods is fixedly connected to each of the sliding blocks.

[0009] Preferably, the bearing mechanism comprises: A rotating plate, wherein a plurality of rotating grooves are symmetrically provided at the top of the pickling tank, and the rotating plate is slidably connected with the inner cavity of the rotating groove through a rotating shaft; A pushing plate, wherein the pushing plate is slidably interlaced with the inner cavity of the rotating plate, and a plurality of pushing plates are provided with a pushing groove on opposite sides thereof for limiting the positions of the plurality of fixing rods; A tension spring, wherein a plurality of the tension springs are equidistantly arranged inside the rotating plate, one end of the tension spring is fixedly connected to the pushing plate, and the other end of the tension spring is fixedly connected to the inner wall of the rotating plate; An extrusion plate, wherein an extrusion groove is provided at the top of the push plate, the extrusion plate passes through the rotating plate and is slidably connected with the inner cavity of the extrusion groove, and the extrusion plate cooperates with the eccentric wheel; Extrusion blocks, wherein a plurality of the extrusion blocks are respectively fixedly connected to the two sides of the extrusion plate, and both sides of the inner wall of the extrusion groove are provided with oblique grooves, and the extrusion blocks are slidably interlaced with the inner cavity of the oblique groove.

[0010] Preferably, the connecting mechanism comprises: A fixing plate, wherein a plurality of the fixing plates are respectively fixedly connected to two sides of the carrying frame; A sleeve, wherein a plurality of the sleeves are respectively fixedly connected to the bottom ends of a plurality of fixing plates; A positioning component is arranged inside the sleeve and is used for connecting the collection frame.

[0011] Preferably, the positioning component comprises: A sliding plate, wherein a plurality of elastic grooves are equidistantly formed inside the fixed plate, and the sliding plate is located inside the elastic grooves; A connecting rod, one end of which is slidably and interpenetratingly connected to the fixed plate, the other end of which is slidably and interpenetratingly connected to the inner cavity of the sleeve, and the connecting rod is fixedly and interpenetratingly connected to the sliding plate; A rotating disk, the rotating disk is fixedly connected to the top end of the connecting rod; Positioning rods, wherein a plurality of the positioning rods are fixedly connected to the top of the fixing plate, a plurality of positioning holes are equidistantly provided at the bottom of the rotating disk, and the positioning rods are slidably interlaced with the inner cavities of the positioning holes; A connecting plate, the connecting plate is fixedly connected to the bottom end of the connecting rod, a plurality of movable grooves are equidistantly provided at the top of the collecting frame, and the sleeve, the connecting plate and the inner cavity of the movable groove cooperate with each other; A compression spring is sleeved on the outside of the connecting rod, one end of the compression spring is fixedly connected to the sliding plate, and the other end of the compression spring is fixedly connected to the top end of the inner wall of the elastic groove.

[0012] Preferably, a plurality of filter holes are equidistantly formed at the bottom end of the inner wall of the collection frame, and a plurality of magnet plates are equidistantly embedded inside the collection frame.

[0013] Preferably, the top end of the top cover is fixedly connected with first pull rings at equal distances, and the center position of the top end of the top cover is fixedly connected with a second pull ring.

[0014] Technical effects and advantages of the present invention: The present invention utilizes the arrangement mode of solution annealing, mechanical descaling, mixed acid pickling in a pickling tank and grinding with heavy brushing equipment to save annealing and pickling losses, reduce annealing burning losses, improve the yield rate, and reduce product roughness to ensure the subsequent whole-roll mirror panel processing effect. At the same time, with the cooperation of the bearing frame, the collecting frame, the transmission mechanism, the bearing mechanism and the connecting mechanism, the plate parts can be shaken up and down and left and right on the plate parts inside the bearing frame under the transmission of the transmission mechanism during the pickling process, thereby reducing the dead angle of pickling and making the pickling more comprehensive. At the same time, the bearing mechanism can not only displace the bearing frame left and right, but also carry the collecting frame, which is convenient for disassembling the connection of the connecting mechanism, so that the collecting frame can clean the pickled rust in time, thereby improving the pickling efficiency and quality of the pickling solution in the pickling tank, and avoiding the accumulation of rust residue in the pickling tank, which causes the pickling tank to be blocked, and can also slow down the consumption rate of the acid solution, extend the service life of the acid solution, and reduce the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is the annealing and pickling flow chart of the present invention.

[0016] Figure 2 It is a structural schematic diagram of the pickling tank of the present invention.

[0017] Figure 3 It is a schematic diagram of the overall front internal structure of the present invention.

[0018] Figure 4 It is a schematic diagram of the internal structure of the lifting assembly at the side of the present invention.

[0019] Figure 5 It is a structural schematic diagram of the carrying mechanism of the present invention.

[0020] Figure 6 It is a schematic diagram of the internal structure of the supporting mechanism of the present invention from the front.

[0021] Figure 7 It is a structural schematic diagram of the bearing frame of the present invention.

[0022] Figure 8 It is a schematic diagram of the structure of the collection frame of the present invention.

[0023] Fig. 9 It is a schematic diagram of the internal structure of the connecting mechanism of the present invention from the side.

[0024] Fig.10 It is a schematic diagram of the internal structure of the collecting frame on the side of the present invention.

[0025] In the figure: 1. pickling tank; 2. top cover; 3. bearing frame; 4. collecting frame; 5. transmission mechanism; 51. motor; 52. transmission rod; 53. eccentric wheel; 54. squeezing roller; 55. lifting assembly; 551. sliding rod; 552. lifting plate; 553. slider; 554. fixing rod; 6. bearing mechanism; 61. rotating plate; 62. pushing plate; 63. tension spring; 64. squeezing plate; 65. squeezing block; 7. connecting mechanism; 71. fixing plate; 72. sleeve; 73. positioning assembly; 731. sliding plate; 732. connecting rod; 733. turntable; 734. positioning rod; 735. connecting plate; 736. compression spring; 8. magnet plate; 9. first pull ring; 10. second pull ring; 11. heating assembly. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] The present invention provides Figure 1 A high yield annealing and pickling method for preparing stainless steel includes the following steps: S1: Solution annealing, using continuous annealing heating furnace with segmented temperature control, the low temperature zone of the furnace is 900-1000℃, the high temperature zone is 1140-1190℃, the TV value is within 240, the solution process requires the low temperature zone temperature ≥900℃, avoiding the sensitization zone of nickel-saving austenite carbide precipitation, and improving the solution annealing effect. The high temperature zone of 1140-1190℃ ensures complete recrystallization, guarantees the solution effect, and meets the requirements of mechanical properties for subsequent cold rolling production; S2: Mechanical descaling, using a tensile and descaling device and a shot blasting device to mechanically break the rust layer on the surface of the steel strip. This process focuses on increasing the tensile descaling force and weakening the shot blasting force to ensure that there is no rust on the board surface and the board surface roughness is low; S3: Pickling with HF+HNO3 mixed acid in the pickling device, HNO3 concentration 80-100g / l, HF concentration 2-8g / l, pickling temperature 45-55℃, pickling time ≥100S. Under conventional pickling process, high HF acid concentration is generally required to ensure rust removal effect, and heavy erosion is caused to the plate surface and grain boundaries while removing rust. This pickling process uses low HF concentration to reduce the degree of acid erosion on the plate surface while ensuring rust removal ability, so that the plate surface has low roughness and improves the yield rate; S4: Use re-brushing equipment to pre-grind the board surface to reduce the roughness and uniformity of the board surface and ensure the subsequent mirror panel processing effect.

[0028] The tension of the straightening and descaling in step S2 is 200-220 / KN, the downward pressure of the straightening rod is 75-85 mm, the current of the shot blasting chamber is 70-90 A, and the speed of the blasting head is 800-1200 rpm.

[0029] The combination of solution annealing, mechanical descaling, mixed acid pickling in a pickling tank, and grinding with heavy brushing equipment can save the annealing and pickling loss of nickel austenitic stainless steel, reduce annealing loss, improve the yield rate of nickel austenitic stainless steel, and reduce product roughness to ensure the subsequent whole roll mirror panel processing effect. The roughness of the plate surface can be further improved to meet the subsequent mirror panel processing needs. The following is an actual sample case: Case 1 Sample 1 is a high-copper and low-nickel austenitic stainless steel. The composition, annealing process, shot blasting descaling process, and pickling process parameters are set as shown in Table 1. The yield rate increased from 98.5% to 98.80%, and the natural gas consumption decreased by 2.43m 3 / t. The roughness is reduced from Ra3.2 to Ra2.7, and the performance meets the downstream production requirements.

[0030] Table 1 Parameters of Sample 1 Case 2 Sample 2 is an economical low-copper and low-nickel austenitic stainless steel. The composition, annealing process, shot blasting descaling process, and pickling process parameters are set as shown in Table 2. The yield rate increased from 98.30% to 98.75%, and the natural gas consumption decreased by 2.45m 3 / t. The roughness is reduced from Ra3.34 to Ra2.82, and the performance meets the downstream production requirements.

[0031] Table 2 Parameters of Sample 2 The present invention also provides Figure 2-10A high yield annealing pickling device for stainless steel is shown, comprising a pickling tank 1, wherein a heating component 11 for controlling the temperature of the acid solution is arranged inside the pickling tank 1, wherein the heating component 11 is electrically connected to an external power supply via a controller outside the pickling tank 1, and the controller can control the heating temperature, so that the internal acid solution temperature can be observed from the display screen of the controller, and by mixing HNO3 with a concentration of 80 to 100 g / l and HF with a concentration of 2 to 8 g / l, and then by using the controller to make the heating component 11 heat the temperature of the HF+HNO3 mixed acid to 45 to 55°C, the pickling operation of the plate can be started, a top cover 2 is arranged at the top of the pickling tank 1, and the top cover 2 can close the top opening of the pickling tank 1, so as to prevent the pickling solution from splashing out of the pickling tank 1 during the pickling process, and a pickling device is arranged between the top cover 2 and the pickling tank 1, and the pickling device comprises : A carrying frame 3, a collecting frame 4, a transmission mechanism 5, a carrying mechanism 6 and a connecting mechanism 7. The carrying frame 3 is arranged inside the pickling tank 1. The carrying frame 3 is mainly composed of a bracket and a mesh structure. It can not only place the plates that need to be pickled inside, but also does not affect the full contact between the pickling liquid and the plates. It can also be opened to take out the plates after the pickling is completed, so that the plates can be subsequently transported to the re-brushing equipment and the plate surface is pre-grinded to reduce the product roughness to ensure the subsequent whole roll mirror panel processing effect; the collecting frame 4 is arranged below the carrying frame 3, and the collecting frame 4 can collect the rust under the pickling of the plates, which is convenient for subsequent removal from the pickling tank 1; the transmission mechanism 5 is arranged inside the top cover 2, and is used to drive the carrying frame 3 to move up and down; the carrying mechanism 6 is arranged inside the pickling tank 1, and is used to fix the collecting frame 4 and drive the carrying frame 3 to move left and right; the connecting mechanism 7 is arranged between the carrying frame 3 and the collecting frame 4.

[0032] Specifically, the transmission mechanism 5 includes: a motor 51, a transmission rod 52, an eccentric wheel 53, an extrusion roller 54 and a lifting assembly 55. The motor 51 is fixedly installed on the top of the top cover 2, and the motor 51 is electrically connected to the external power supply through an external switch; the two ends of the transmission rod 52 are rotatably arranged on both sides of the inner wall of the top cover 2; multiple eccentric wheels 53 are fixedly inserted and connected with the transmission rod 52, and the multiple eccentric wheels 53 are staggered and symmetrically arranged, and the eccentric wheels 53 and the bearing mechanism 6 cooperate with each other; the extrusion roller 54 is fixedly inserted and connected with the transmission rod 52, and the cross-section of the extrusion roller 54 is elliptical. The eccentric wheel 53 and the extrusion roller 54 on the transmission rod 52 are driven by the motor 51 to rotate, so that the eccentric wheel 53 can intermittently squeeze the bearing mechanism 6, and the extrusion roller 54 can also intermittently squeeze the lifting assembly 55; the lifting assembly 55 is arranged at the top of the bearing frame 3.

[0033] The lifting assembly 55 includes: a slide bar 551, a lifting plate 552, a slider 553 and a fixed rod 554. Slide grooves are provided on both sides of the inner wall of the top cover 2. The two ends of the slide bar 551 are fixedly connected to the top and bottom ends of the inner wall of the slide groove respectively; the lifting plate 552 is slidably interlaced with multiple slide bars 551, and the lifting plate 552 cooperates with the squeezing roller 54. When the elliptical squeezing roller 54 rotates, the lifting plate 552 can be intermittently squeezed, so that when the squeezing roller 54 rotates, it can be driven by the slider 553 The supporting frame 3 on the fixed rod 554 is displaced back and forth in the vertical direction; a plurality of sliding grooves are provided inside the lifting plate 552, and the sliders 553 are slidably and interlacedly connected with the inner cavities of the sliding grooves; one ends of the plurality of fixed rods 554 are fixedly connected to the supporting frame 3, and the other ends of the plurality of fixed rods 554 are respectively fixedly connected to the plurality of sliders 553. When the eccentric wheel 53 squeezes the supporting mechanism 6 so that the supporting frame 3 can be displaced back and forth in the horizontal direction, the sliders 553 on the fixed rods 554 can slide inside the sliding grooves.

[0034] Specifically, the bearing mechanism 6 includes: a rotating plate 61, a pushing plate 62, a tension spring 63, an extrusion plate 64 and an extrusion block 65. A plurality of rotating grooves are symmetrically provided at the top of the pickling tank 1. The rotating plate 61 is slidably connected with the inner cavity of the rotating groove through a rotating shaft. When the top cover 2 is pressed on the top of the pickling tank 1, the rotating plate 61 remains in a horizontal state, and the eccentric wheel 53 is located above the extrusion plate 64. Therefore, when the eccentric wheel 53 rotates, the extrusion plate 64 can be intermittently extruded by the eccentric wheel 53, so that the extrusion block 65 can pass through the extrusion chute, so that the pushing plate 62 can The fixing rod 554 can be pushed intermittently, so that the plate inside the carrying frame 3 can be displaced in the horizontal direction; the pushing plate 62 is slidably connected with the inner cavity of the rotating plate 61, and the opposite sides of the multiple pushing plates 62 are provided with pushing grooves for limiting the multiple fixing rods 554. The pushing grooves are convenient for limiting the fixing rods 554, so that the carrying frame 3 can be horizontally moved back and forth inside the acid solution by pushing the fixing rods 554; multiple tension springs 63 are equidistantly arranged inside the rotating plate 61, one end of the tension spring 63 is fixedly connected to the pushing plate 62, and the other end of the tension spring 63 is fixedly connected to the pushing plate 62. The end is fixedly connected to the inner wall of the rotating plate 61. After the pushing plate 62 is squeezed out of a part of the inner cavity of the rotating plate 61, the tension spring 63 can reset the pushing plate 62 by its own elastic force without squeezing the squeezing plate 64 when the eccentric wheel 53 stops squeezing the squeezing plate 64. The top of the pushing plate 62 is provided with an squeezing groove, and the squeezing plate 64 passes through the inner cavity of the rotating plate 61 and is slidably interlaced and connected. The squeezing plate 64 cooperates with the eccentric wheel 53, and the multiple eccentric wheels 53 are symmetrically staggered, so that when one of the eccentric wheels 53 squeezes one of the squeezing plates 64, the other eccentric wheel 53 is also 3 just does not squeeze the other squeezing plate 64, so that the carrying frame 3 is pushed by the force generated by the squeezing of the eccentric wheel 53 each time, so that it can stably move back and forth in the horizontal direction inside the pickling tank 1; multiple squeezing blocks 65 are respectively fixedly connected to the two sides of the squeezing plate 64, and both sides of the inner wall of the squeezing groove are provided with inclined grooves. The squeezing blocks 65 are slidably connected with the inner cavity of the inclined groove. The squeezing of the inclined groove by the squeezing blocks 65 can convert the force in the vertical direction into the force in the horizontal direction, so that the pushing plate 62 can move in the horizontal direction for a period of time.

[0035] Specifically, the connecting mechanism 7 includes: a fixed plate 71, a sleeve 72 and a positioning assembly 73, wherein the plurality of fixed plates 71 are respectively fixedly connected to the two sides of the supporting frame 3; the plurality of sleeves 72 are respectively fixedly connected to the bottom ends of the plurality of fixed plates 71; the positioning assembly 73 is arranged inside the sleeve 72, and is used to connect the collecting frame 4, and the supporting frame 3 and the collecting frame 4 can be connected together through the positioning assembly 73, and when the collecting frame 4 sinks to the bottom of the acid liquid and remains motionless and connected to the supporting frame 3, the supporting frame 3 can be normally displaced in the horizontal and vertical directions.

[0036] The positioning assembly 73 includes a sliding plate 731, a connecting rod 732, a rotating disk 733, a positioning rod 734, a connecting plate 735 and a compression spring 736. A plurality of elastic grooves are equidistantly provided inside the fixed plate 71, and the sliding plate 731 is located inside the elastic groove; one end of the connecting rod 732 is slidably interlaced and connected with the fixed plate 71, and the other end of the connecting rod 732 is slidably interlaced and connected with the inner cavity of the sleeve 72, and the connecting rod 732 is fixedly interlaced and connected with the sliding plate 731; the rotating disk 733 is fixedly connected to the top of the connecting rod 732; a plurality of positioning rods 734 are fixedly connected to the top of the fixed plate 71, and a plurality of positioning holes are equidistantly provided at the bottom end of the rotating disk 733, and the positioning rod 734 is slidably interlaced and connected with the inner cavity of the positioning hole; the connecting plate 735 is fixedly connected to the bottom end of the connecting rod 732, and the top of the collection frame 4 A plurality of movable grooves are equidistantly provided at the end, and the sleeve 72 and the connecting plate 735 cooperate with the inner cavity of the movable groove; a compression spring 736 is sleeved on the outside of the connecting rod 732, one end of the compression spring 736 is fixedly connected to the sliding plate 731, and the other end of the compression spring 736 is fixedly connected to the top of the inner wall of the elastic groove. The compression spring 736 is always in a compressed state, so that a stable downward elastic force can be provided to the connecting rod 732 through the sliding plate 731, so that the turntable 733 can be inserted with the positioning rod 734, so that the direction of the connecting plate 735 on the connecting rod 734 can be restricted, so that the connecting plate 735 can be inserted into the movable groove at the top of the collecting frame 4, and then the collecting frame 4 can be connected with the supporting frame 3 by rotating it 90°, so that the collecting frame 4 can be taken out conveniently.

[0037] A plurality of filter holes are equidistantly provided at the bottom end of the inner wall of the collecting frame 4, and a plurality of magnet plates 8 are equidistantly embedded inside the collecting frame 4. The magnet plates 8 can enhance the adsorption capacity of rust, thereby preventing rust residue from accumulating in the pickling tank 1 and causing the pickling tank 1 to be blocked. The consumption rate of the acid solution can also be slowed down, thereby extending the service life of the acid solution and reducing costs.

[0038] The top of the top cover 2 is equidistantly fixedly connected with a first pull ring 9, and the center position of the top of the top cover 2 is fixedly connected with a second pull ring 10. The first pull ring 9 and the second pull ring 10 can be connected through an external lifting device, thereby driving the top cover 2 to move back and forth in the vertical direction.

[0039] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for preparing stainless steel by annealing and pickling with a high yield rate, characterized in that: The following steps are involved: S1: Solution annealing, using continuous annealing heating furnace with segmented temperature control, low temperature zone 900 ~ 1000 ℃, high temperature zone 1140 ~ 1190 ℃, TV value within 240; S2: Mechanical descaling, using a tension and descaling device and a shot blasting device to mechanically break the rust layer on the surface of the steel strip; S3: Pickling in a pickling device using HF+HNO3 mixed acid, HNO3 concentration 80-100 g / l, HF concentration 2-8 g / l, pickling temperature 45-55°C, pickling time ≥100S; S4: Use rebrushing equipment to pre-grind the board surface.

2. The high yield annealing and pickling method for preparing stainless steel according to claim 1, characterized in that: In step S2, the tension of the straightening and descaling is 200-220 / KN, the downward pressure of the straightening rod is 75-85 mm, the current of the shot blasting chamber is 70-90 A, and the rotation speed of the blasting head is 800-1200 rpm.

3. A high yield annealing and pickling device for stainless steel according to claim 1, comprising a pickling tank (1), wherein a heating component (11) for controlling the temperature of the acid solution is arranged inside the pickling tank (1), characterized in that: A top cover (2) is provided at the top of the pickling tank (1), and a pickling device is provided between the top cover (2) and the pickling tank (1), the pickling device comprising: A carrying frame (3), wherein the carrying frame (3) is arranged inside the pickling tank (1); A collecting frame (4), the collecting frame (4) being arranged below the carrying frame (3); A transmission mechanism (5), the transmission mechanism (5) being disposed inside the top cover (2) and used for driving the bearing frame (3) to move up and down; A bearing mechanism (6), the bearing mechanism (6) being arranged inside the pickling tank (1) and being used to fix the collecting frame (4) and drive the bearing frame (3) to move left and right; A connecting mechanism (7), wherein the connecting mechanism (7) is arranged between the carrying frame (3) and the collecting frame (4).

4. A high yield annealing and pickling device for stainless steel according to claim 3, characterized in that: The transmission mechanism (5) comprises: A motor (51), wherein the motor (51) is fixedly mounted on the top of the top cover (2); A transmission rod (52), wherein two ends of the transmission rod (52) are rotatably disposed on two sides of the inner wall of the top cover (2); Eccentric wheels (53), wherein a plurality of the eccentric wheels (53) are fixedly connected to the transmission rod (52) through insertion, the plurality of the eccentric wheels (53) are arranged in a staggered and symmetrical manner, and the eccentric wheels (53) cooperate with the bearing mechanism (6); A squeezing roller (54), the squeezing roller (54) being fixedly connected to the transmission rod (52) in an interlaced manner, and the cross-section of the squeezing roller (54) being elliptical; A lifting component (55), wherein the lifting component (55) is arranged at the top end of the carrying frame (3).

5. The high yield annealing and pickling device for stainless steel according to claim 4, characterized in that: The lifting assembly (55) comprises: A slide rod (551), wherein slide grooves are provided on both sides of the inner wall of the top cover (2), and the two ends of the slide rod (551) are respectively fixedly connected to the top end and the bottom end of the inner wall of the slide groove; A lifting plate (552), the lifting plate (552) being slidably interlaced with a plurality of sliding rods (551), and the lifting plate (552) and the squeezing roller (54) being coordinated with each other; A sliding block (553), wherein a plurality of sliding grooves are provided inside the lifting plate (552), and the sliding block (553) is slidably interlaced with the inner cavity of the sliding groove; A fixing rod (554), wherein one end of each of the fixing rods (554) is fixedly connected to the bearing frame (3), and the other ends of each of the fixing rods (554) are fixedly connected to each of the sliding blocks (553).

6. The high yield annealing and pickling device for stainless steel according to claim 4, characterized in that: The bearing mechanism (6) comprises: A rotating plate (61), wherein a plurality of rotating grooves are symmetrically provided at the top of the pickling tank (1), and the rotating plate (61) is slidably connected to the inner cavity of the rotating grooves via a rotating shaft; A pushing plate (62), the pushing plate (62) being slidably interlaced with the inner cavity of the rotating plate (61), and a plurality of pushing plates (62) having opposite sides each provided with a pushing groove for limiting the position of a plurality of fixing rods (554); A tension spring (63), wherein a plurality of the tension springs (63) are equidistantly arranged inside the rotating plate (61), one end of the tension spring (63) is fixedly connected to the pushing plate (62), and the other end of the tension spring (63) is fixedly connected to the inner wall of the rotating plate (61); An extrusion plate (64), wherein the top end of the push plate (62) is provided with an extrusion groove, the extrusion plate (64) passes through the rotating plate (61) and is slidably connected with the inner cavity of the extrusion groove, and the extrusion plate (64) cooperates with the eccentric wheel (53); Extrusion blocks (65), wherein a plurality of the extrusion blocks (65) are respectively fixedly connected to two sides of the extrusion plate (64), and oblique grooves are provided on both sides of the inner wall of the extrusion groove, and the extrusion blocks (65) are slidably interlaced with the inner cavity of the oblique groove.

7. The high yield annealing and pickling device for stainless steel according to claim 3, characterized in that: The connecting mechanism (7) comprises: A fixing plate (71), wherein a plurality of the fixing plates (71) are respectively fixedly connected to two sides of the carrying frame (3); A sleeve (72), wherein a plurality of the sleeves (72) are respectively fixedly connected to the bottom ends of a plurality of fixing plates (71); A positioning assembly (73), wherein the positioning assembly (73) is arranged inside the sleeve (72) and is used for connecting to the collection frame (4).

8. The high yield annealing and pickling device for stainless steel according to claim 7, characterized in that: The positioning component (73) comprises: A sliding plate (731), wherein a plurality of elastic grooves are equidistantly formed inside the fixed plate (71), and the sliding plate (731) is located inside the elastic grooves; A connecting rod (732), one end of the connecting rod (732) being slidably interpenetratingly connected to the fixed plate (71), the other end of the connecting rod (732) being slidably interpenetratingly connected to the inner cavity of the sleeve (72), and the connecting rod (732) being fixedly interpenetratingly connected to the sliding plate (731); A rotating disk (733), wherein the rotating disk (733) is fixedly connected to the top end of the connecting rod (732); Positioning rods (734), wherein a plurality of the positioning rods (734) are fixedly connected to the top end of the fixing plate (71), a plurality of positioning holes are equidistantly formed at the bottom end of the rotating disk (733), and the positioning rods (734) are slidably interlaced with the inner cavities of the positioning holes; A connecting plate (735), the connecting plate (735) being fixedly connected to the bottom end of the connecting rod (732), a plurality of movable grooves being equidistantly formed at the top end of the collecting frame (4), the sleeve (72) and the connecting plate (735) cooperating with the inner cavity of the movable grooves; A compression spring (736), wherein the compression spring (736) is sleeved on the outside of the connecting rod (732), one end of the compression spring (736) is fixedly connected to the sliding plate (731), and the other end of the compression spring (736) is fixedly connected to the top end of the inner wall of the elastic groove.

9. The high yield annealing and pickling device for stainless steel according to claim 3, characterized in that: A plurality of filter holes are equidistantly provided at the bottom end of the inner wall of the collection frame (4), and a plurality of magnet plates (8) are equidistantly embedded inside the collection frame (4).

10. The high yield annealing and pickling device for stainless steel according to claim 3, characterized in that: The top end of the top cover (2) is fixedly connected to first pull rings (9) at equal distances, and the center of the top end of the top cover (2) is fixedly connected to a second pull ring (10).

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