A method for preparing stainless steel by high yield annealing and pickling

Abstract

The application discloses a high-yield annealing and pickling preparation method of stainless steel, S1: solid solution annealing, S2: mechanical descaling, adopting a tension straightening and breaking scale device and a shot blasting device to mechanically break the surface rust layer of a steel belt; S3: HF+HNO3 mixed acid pickling; S4: using heavy brushing equipment to pre-grind the plate surface. The application can save annealing and pickling loss, reduce annealing loss, improve the yield, reduce the product roughness, ensure the subsequent whole roll mirror plate processing effect, drive the plate to shake under the cooperation of the bearing frame, the collecting frame, the transmission mechanism, the bearing mechanism and the connecting mechanism, reduce the dead angle of the plate pickling, make the pickling more comprehensive, clean the rust of the pickling in time, improve the pickling efficiency and quality of the pickling liquid in the pickling tank, avoid the accumulation of rust slag in the pickling tank, prevent the pickling tank from being blocked, slow down the consumption speed of the acid liquid, prolong the service life of the acid liquid, and reduce the cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of stainless steel processing, in particular to a high-yield annealing and pickling preparation method of stainless steel. BACKGROUND

[0002] In actual industrial production, compared with ordinary 304 steel, the yield of hot acid pickling and nickel austenitic stainless steel is low and the roughness is high, which seriously affects the enterprise benefit and the subsequent mirror panel processing effect. In order to improve the yield of steel strip, enterprises mostly reduce the annealing temperature to reduce the oxidation loss, or directly reduce the acid concentration to reduce the acid etching loss, so as to improve the yield of steel strip.

[0003] The method of directly reducing the annealing temperature cannot guarantee the mechanical properties of the material, affecting the subsequent process. The method of directly reducing the acid concentration places the plate in the inside of the pickling tank by hoisting, which not only causes poor pickling of the plate surface, rust residue, and cannot meet the requirements of the plate surface for thick mirror panel processing, but also accumulates a large amount of rust slag at the bottom of the pickling tank as the number of pickling plates increases. If these rust slag cannot be cleaned in time, it will inevitably block the drain of the pickling tank, affecting the normal use of the pickling tank, and the rust slag also needs to be salvaged by manual method, which may cause the acid liquid to splash and may affect the health of the salvaging personnel, which is relatively inconvenient. SUMMARY

[0004] The present application aims to provide a high-yield annealing and pickling preparation method of stainless steel to solve the problems in the background art.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a high-yield annealing and pickling preparation method of stainless steel, comprising the following steps:

[0006] S1: solid solution annealing, using continuous annealing heating furnace to control temperature in different sections, the low temperature zone is 900-1000 DEG C, the high temperature zone is 1140-1190 DEG C, and the TV value is within 240;

[0007] S2: mechanical descaling, using a tension straightening and breaking device and a shot blasting device to mechanically break the rust layer on the surface of the steel strip;

[0008] S3: pickling in the pickling device by HF+HNO3 mixed acid, the HNO3 concentration is 80-100 g / l, the HF concentration is 2-8 g / l, the pickling temperature is 45-55 DEG C, and the pickling time is greater than or equal to 100 S;

[0009] S4: using heavy brushing equipment to pre-grind the plate surface.

[0010] Preferably, the tension of the straightening and descaling is 200-220 KN, the straightening roll is pressed 75-85 mm, the current of the shot blasting bin is 70-90 A, and the rotation speed of the shot head is 800-1200 rpm.

[0011] The application further provides a high-yield annealing and pickling device for stainless steel, which comprises a pickling tank, a heating assembly for controlling the temperature of acid liquid arranged in the pickling tank, and a top cover arranged at the top end of the pickling tank.

[0012] A bearing frame is arranged in the pickling tank.

[0013] A collecting frame is arranged below the bearing frame.

[0014] A transmission mechanism is arranged in the top cover and used for driving the bearing frame to move up and down.

[0015] A bearing mechanism is arranged in the pickling tank and used for fixing the collecting frame and driving the bearing frame to move left and right.

[0016] A connecting mechanism is arranged between the bearing frame and the collecting frame.

[0017] Preferably, the transmission mechanism comprises:

[0018] A motor is fixedly installed at the top end of the top cover.

[0019] A transmission rod is rotatably arranged at the two sides of the inner wall of the top cover.

[0020] A plurality of eccentric wheels are fixedly and penetratingly connected with the transmission rod, the plurality of eccentric wheels are arranged in an interlaced and symmetrical manner, and the eccentric wheels are matched with the bearing mechanism.

[0021] An extrusion roller is fixedly and penetratingly connected with the transmission rod, and the cross section of the extrusion roller is in an elliptical shape.

[0022] A lifting assembly is arranged at the top end of the bearing frame.

[0023] Preferably, the lifting assembly comprises:

[0024] A slide rod is arranged at the two sides of the inner wall of the top cover, and the two ends of the slide rod are fixedly connected with the top end and the bottom end of the inner wall of the slide groove.

[0025] A lifting plate is slidingly and penetratingly connected with the plurality of slide rods, and the lifting plate is matched with the extrusion roller.

[0026] The sliding block is connected with the inner cavity of the sliding groove in a sliding and penetrating manner.

[0027] The fixed rod is fixedly connected with the bearing frame at one end, and is fixedly connected with the sliding block at the other end.

[0028] Preferably, the bearing mechanism comprises:

[0029] The rotating plate is provided with a plurality of rotating grooves at the top end of the pickling tank in a symmetrical manner, and is connected with the inner cavity of the rotating groove in a sliding and penetrating manner through a rotating shaft.

[0030] The push plate is connected with the inner cavity of the rotating plate in a sliding and penetrating manner, and a push groove is formed in the opposite side of the push plate.

[0031] The tension spring is equidistantly arranged in the inner part of the rotating plate, and one end of the tension spring is fixedly connected with the push plate, and the other end of the tension spring is fixedly connected with the inner wall of the rotating plate.

[0032] The extrusion plate is provided with an extrusion groove at the top end of the push plate, and is connected with the inner cavity of the extrusion groove in a sliding and penetrating manner through the rotating plate.

[0033] The extrusion block is fixedly connected to the two sides of the extrusion plate, and the inner wall of the extrusion groove is provided with a bevel groove on the two sides.

[0034] Preferably, the connecting mechanism comprises:

[0035] The fixed plate is fixedly connected to the two sides of the bearing frame.

[0036] The sleeve is fixedly connected to the bottom end of the fixed plate.

[0037] The positioning assembly is arranged in the inner part of the sleeve and is used for connecting the collecting frame.

[0038] Preferably, the positioning assembly comprises:

[0039] The sliding plate is equidistantly arranged in the inner part of the fixed plate.

[0040] The connecting rod is connected with the fixed plate in a sliding and penetrating manner at one end, and is connected with the inner cavity of the sleeve in a sliding and penetrating manner at the other end.

[0041] The rotating disc is fixedly connected to the top end of the connecting rod.

[0042] Positioning rods, the plurality of positioning rods are fixedly connected to the top end of the fixed plate, a plurality of positioning holes are equidistantly arranged on the bottom end of the rotating disc, and the positioning rod is in sliding insertion connection with the inner cavity of the positioning hole;

[0043] A connecting plate is fixedly connected to the bottom end of the connecting rod, a plurality of moving grooves are equidistantly arranged on the top end of the collecting frame, and the sleeve and the connecting plate are matched with the inner cavities of the moving grooves;

[0044] A compression spring is sleeved on the outside of the connecting rod, one end of the compression spring is fixedly connected with the sliding plate, and the other end of the compression spring is fixedly connected with the top end of the inner wall of the elastic groove.

[0045] Preferably, a plurality of filter holes are equidistantly arranged on the bottom end of the inner wall of the collecting frame, and a plurality of magnet plates are equidistantly embedded in the inside of the collecting frame.

[0046] Preferably, a first pull ring is fixedly connected to the top end of the top cover, and a second pull ring is fixedly connected to the center position of the top end of the top cover.

[0047] Technical effects and advantages of the present application:

[0048] The present application utilizes the setting mode of solid solution annealing, mechanical descaling, mixed acid pickling in the acid pickling tank and grinding in the re-coating equipment, can save annealing pickling loss, reduce annealing loss, improve the yield, reduce the product roughness, to ensure the processing effect of the subsequent whole roll mirror panel, at the same time, under the cooperation of the bearing frame, the collecting frame, the transmission mechanism, the bearing mechanism and the connecting mechanism, the plate in the process of pickling can be shaken up and down and left and right under the transmission of the transmission mechanism, so as to reduce the dead angle of pickling, make the pickling more comprehensive, at the same time, the bearing mechanism can not only displace the bearing frame left and right, but also can bear the collecting frame, facilitate the connection of the connecting mechanism, make the collecting frame can clean the rust of pickling in time, improve the pickling efficiency and quality of the pickling liquid in the acid pickling tank, at the same time, avoid the accumulation of rust slag in the acid pickling tank, make the acid pickling tank blocked, also can slow down the consumption speed of the acid liquid, prolong the service cycle of the acid liquid, reduce the cost. BRIEF DESCRIPTION OF DRAWINGS

[0049] Figure 1 The annealing pickling flow chart of the present application.

[0050] Figure 2 The structure diagram of the acid pickling tank of the present application.

[0051] Figure 3 The overall front internal structure diagram of the present application.

[0052] Figure 4The figure is a schematic diagram of the side internal structure of the lifting assembly.

[0053] Figure 5 The figure is a schematic diagram of the structure of the bearing mechanism.

[0054] Figure 6 The figure is a schematic diagram of the front internal structure of the bearing mechanism.

[0055] Figure 7 The figure is a schematic diagram of the structure of the bearing frame.

[0056] Figure 8 The figure is a schematic diagram of the structure of the collection frame.

[0057] Figure 9 The figure is a schematic diagram of the side internal structure of the connecting mechanism.

[0058] Figure 10 The figure is a schematic diagram of the side internal structure of the collection frame.

[0059] In the figure: 1, pickling tank; 2, top cover; 3, bearing frame; 4, collection frame; 5, transmission mechanism; 51, motor; 52, transmission rod; 53, eccentric wheel; 54, extrusion roller; 55, lifting assembly; 551, sliding rod; 552, lifting plate; 553, sliding block; 554, fixed rod; 6, bearing mechanism; 61, rotating plate; 62, pushing plate; 63, tension spring; 64, extrusion plate; 65, extrusion block; 7, connecting mechanism; 71, fixed plate; 72, sleeve; 73, positioning assembly; 731, sliding plate; 732, connecting rod; 733, rotating disc; 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

[0060] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0061] The present application provides a stainless steel high yield annealing pickling preparation method as shown in Figure 1 The present application provides a stainless steel high yield annealing pickling preparation method as shown in

[0062] S1: solid solution annealing, using continuous annealing furnace, temperature control in different sections, low temperature zone 900-1000℃, high temperature zone 1140-1190℃, TV value within 240, solid solution process requires temperature≥900℃ in low temperature zone to avoid sensitive interval of nickel austenitic carbide precipitation and improve solid solution annealing effect, high temperature zone 1140-1190℃ ensures complete recrystallization and solid solution effect to meet mechanical property requirements of subsequent cold rolling production;

[0063] S2: mechanical descaling, using tension leveling and breaking scale device and shot blasting device to mechanically break steel strip surface rust layer, the process focuses on increasing tension leveling descaling force and weakening shot blasting descaling impact to ensure no rust point residue and low plate surface roughness;

[0064] S3: HF+HNO3 mixed acid pickling in 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, which causes heavy erosion on plate surface and grain boundary at the same time. The present pickling process uses low HF concentration to reduce the erosion of acid on the plate surface under the condition of ensuring the rust removal capacity, so that the plate surface obtains low roughness and improves the yield;

[0065] S4: use of heavy brushing equipment to pre-grind the plate surface, reduce plate surface roughness and uniformity, and ensure the processing effect of subsequent mirror plate.

[0066] The tension of the tension leveling and breaking scale in step S2 is 200-220 / KN, the straightening roll pressure is 75-85mm, the shot blasting bin current is 70-90A, and the shot head speed is 800-1200rpm.

[0067] The use of solid solution annealing, mechanical descaling, mixed acid pickling in acid pickling tank, and heavy brushing equipment grinding can save the annealing and pickling loss of nickel austenitic stainless steel, reduce the annealing loss, improve the yield of nickel austenitic stainless steel, and reduce the product roughness to ensure the processing effect of subsequent whole roll mirror plate, which can further improve the plate surface roughness to meet the subsequent mirror plate processing requirements. The following is an actual sample case:

[0068] Case 1

[0069] Sample 1 is high copper nickel austenitic stainless steel, the composition, annealing process, shot blasting descaling process, and pickling process parameter settings are shown in Table 1, the yield is increased from 98.5% to 98.80%, and the natural gas consumption is reduced by 2.43m 3 / t. The roughness is reduced from Ra3.2 to Ra2.7, and the performance meets the downstream production requirements.

[0070] Table 1: Sample 1 Parameter List

[0071]

[0072] Case 2

[0073] Sample 2 is an economic low-copper nickel-saving austenitic stainless steel, the composition, annealing process, shot blasting descaling process, pickling process parameter setting as shown in Table 2, the yield rate increases from 98.30% to 98.75%, the natural gas consumption decreases by 2.45m 3 / t. Roughness decreases from Ra3.34 to Ra2.82, and performance meets the downstream production demand.

[0074] Table 2 Sample 2 parameter list

[0075]

[0076] The application also provides a high-yield annealing and pickling device for stainless steel as shown in the description Figures 2-10 The controller can control the heating temperature, so that the internal acid temperature can be observed from the display screen of the controller, HNO3 with a concentration of 80-100g / l and HF with a concentration of 2-8g / l are mixed, then the controller is used to heat the temperature of the HF+HNO3 mixed acid to 45-55℃ by the heating assembly 11, and the pickling operation of the plate can be started, the top end of the pickling tank 1 is provided with a top cover 2, which can close the top end opening of the pickling tank 1, so as to avoid that the pickling liquid splashes out of the pickling tank 1 during pickling, the pickling device is arranged between the top cover 2 and the pickling tank 1, and the pickling device comprises a bearing frame 3, a collecting frame 4, a transmission mechanism 5, a bearing mechanism 6 and a connecting mechanism 7, the bearing frame 3 is arranged in the interior of the pickling tank 1, the bearing frame 3 is mainly composed of a support and a mesh structure, the plate to be pickled can be placed in the interior, the pickling liquid can fully contact the plate, and the plate can be taken out after pickling is completed, so that the plate is conveyed to the heavy brushing equipment, the plate surface is pre-polished, the product roughness is reduced, and the subsequent whole roll mirror surface plate processing effect is ensured; the collecting frame 4 is arranged below the bearing frame 3, the collecting frame 4 can collect the rust under the plate pickling, and the pickling tank 1 is conveniently taken out; the transmission mechanism 5 is arranged in the interior of the top cover 2 and is used for driving the bearing frame 3 to displace upward and downward; the bearing mechanism 6 is arranged in the interior of the pickling tank 1 and is used for fixing the collecting frame 4 and driving the bearing frame 3 to displace left and right; and the connecting mechanism 7 is arranged between the bearing frame 3 and the collecting frame 4.

[0077] Specifically, the transmission mechanism 5 comprises a motor 51, a transmission rod 52, eccentric wheels 53, a squeezing roller 54 and a lifting assembly 55. The motor 51 is fixedly installed at the top end of the top cover 2 and electrically connected with an external power supply through an external switch. The two ends of the transmission rod 52 are rotatably arranged on the two sides of the inner wall of the top cover 2. The plurality of eccentric wheels 53 are fixedly and penetratingly connected with the transmission rod 52, and are arranged in a staggered and symmetrical manner. The eccentric wheels 53 are matched with the bearing mechanism 6. The squeezing roller 54 is fixedly and penetratingly connected with the transmission rod 52. The cross section of the squeezing roller 54 is in an oval shape. The eccentric wheels 53 and the squeezing roller 54 are driven to rotate by the motor 51, so that the eccentric wheels 53 intermittently squeeze the bearing mechanism 6, and the squeezing roller 54 intermittently squeezes the lifting assembly 55. The lifting assembly 55 is arranged at the top end of the bearing frame 3.

[0078] The lifting assembly 55 comprises a sliding rod 551, a lifting plate 552, a sliding block 553 and a fixed rod 554. The two sides of the inner wall of the top cover 2 are provided with sliding grooves. The two ends of the sliding rod 551 are fixedly connected with the top end and the bottom end of the inner wall of the sliding groove. The lifting plate 552 is slidingly and penetratingly connected with the plurality of sliding rods 551. The lifting plate 552 is matched with the squeezing roller 54. When the oval-shaped squeezing roller 54 rotates, the lifting plate 552 is intermittently squeezed, so that the bearing frame 3 on the fixed rod 554 vertically reciprocates when the squeezing roller 54 rotates. The inner part of the lifting plate 552 is provided with a plurality of sliding grooves. The sliding block 553 is slidingly and penetratingly connected with the inner cavity of the sliding groove. One end of the plurality of fixed rods 554 is fixedly connected with the bearing frame 3. The other end of the plurality of fixed rods 554 is fixedly connected with the plurality of sliding blocks 553. When the eccentric wheels 53 squeeze the bearing mechanism 6 to enable the bearing frame 3 to reciprocate in the horizontal direction, the sliding block 553 on the fixed rod 554 slides in the sliding groove.

[0079] Specifically, the bearing mechanism 6 comprises: a rotating plate 61, a pushing plate 62, a tension spring 63, a pressing plate 64 and a pressing block 65, the top end of the pickling tank 1 is symmetrically provided with a plurality of rotating grooves, the rotating plate 61 is slidably connected with the inner cavity of the rotating groove through a rotating shaft, the rotating plate 61 remains in a horizontal state when the top cover 2 is pressed on the top of the pickling tank 1, and the eccentric wheel 53 is located above the pressing plate 64, so that the pressing plate 64 can be intermittently pressed by the eccentric wheel 53 when the eccentric wheel 53 rotates, so that the pressing block 65 can pass through the pressing inclined groove to make the pushing plate 62 intermittently push the fixed rod 554, so that the plate inside the bearing frame 3 can move in the horizontal direction; the inner cavity of the rotating plate 61 is slidably connected with the pushing plate 62, the opposite side of the plurality of pushing plates 62 is provided with a pushing groove for limiting the plurality of fixed rods 554, the pushing groove facilitates the limiting of the fixed rod 554, so that the bearing frame 3 can reciprocatingly move in the horizontal direction inside the acid liquid by pushing the fixed rod 554; a plurality of tension springs 63 are equidistantly arranged in the inner part of the rotating plate 61, one end of the tension spring 63 is fixedly connected with the pushing plate 62, the other end of the tension spring 63 is fixedly connected with the inner wall of the rotating plate 61, and the tension spring 63 can reset the pushing plate 62 by using its elastic force when the pushing plate 62 is extruded out of a part of the inner cavity of the rotating plate 61 without the eccentric wheel 53 pressing the pressing plate 64; the top end of the pushing plate 62 is provided with a pressing groove, the pressing plate 64 is slidably connected with the inner cavity of the pressing groove through the rotating plate 61, the pressing plate 64 cooperates with the eccentric wheel 53, and a plurality of eccentric wheels 53 are symmetrically and staggeredly arranged, so that when one of the eccentric wheels 53 presses one of the pressing plates 64, the other eccentric wheel 53 does not press the other pressing plate 64, so that the bearing frame 3 is pushed by the force generated by the pressing of the eccentric wheel 53 each time, so that it can stably reciprocate in the horizontal direction inside the pickling tank 1; a plurality of pressing blocks 65 are respectively fixedly connected to the two sides of the pressing plate 64, the two sides of the inner wall of the pressing groove are provided with inclined grooves, the pressing block 65 is slidably connected with the inner cavity of the inclined groove, and the pressing block 65 extrudes the inclined groove to convert the vertical force into the horizontal force, so that the pushing plate 62 can move in the horizontal direction.

[0080] Specifically, the connecting mechanism 7 comprises: a fixed plate 71, a sleeve 72 and a positioning assembly 73, a plurality of fixed plates 71 are respectively fixedly connected to the two sides of the bearing frame 3; a plurality of sleeves 72 are respectively fixedly connected to the bottom end of the plurality of fixed plates 71; the positioning assembly 73 is arranged in the inner part of the sleeve 72 and is used for connecting the collecting frame 4, the bearing frame 3 and the collecting frame 4 can be connected together through the positioning assembly 73, and when the collecting frame 4 is sunk at the bottom of the acid liquid and is connected with the bearing frame 3, the bearing frame 3 can normally move in the horizontal direction and the vertical direction.

[0081] The positioning assembly 73 comprises a sliding plate 731, a connecting rod 732, a rotating disc 733, positioning rods 734, a connecting plate 735 and a compression spring 736, a plurality of elastic grooves are equidistantly formed in the inner part of the fixed plate 71, and the sliding plate 731 is located in the inner part of the elastic groove; one end of the connecting rod 732 is in sliding penetration connection with the fixed plate 71, the other end of the connecting rod 732 is in sliding penetration connection with the inner cavity of the sleeve 72, and the connecting rod 732 is in fixed penetration connection with the sliding plate 731; the rotating disc 733 is fixedly connected to the top end of the connecting rod 732; a plurality of positioning rods 734 are fixedly connected to the top end of the fixed plate 71, a plurality of positioning holes are equidistantly formed in the bottom end of the rotating disc 733, and the positioning rods 734 are in sliding penetration connection with the inner cavities of the positioning holes; the connecting plate 735 is fixedly connected to the bottom end of the connecting rod 732, a plurality of moving grooves are equidistantly formed in the top end of the collecting frame 4, and the sleeve 72 and the connecting plate 735 are matched with the inner cavities of the moving grooves; the compression spring 736 is sleeved on the outer part of the connecting rod 732, one end of the compression spring 736 is fixedly connected with the sliding plate 731, the other end of the compression spring 736 is fixedly connected with the top end of the inner wall of the elastic groove, and the compression spring 736 is always in a compressed state, so that the connecting rod 732 can be provided with a stable downward elastic force through the sliding plate 731, the rotating disc 733 can be in penetration with the positioning rods 734, the direction of the connecting plate 735 on the connecting rod 734 can be limited, and then the connecting plate 735 can be inserted into the moving grooves on the top of the collecting frame 4, and then the collecting frame 4 and the bearing frame 3 can be connected together through 90° rotation positioning, so that the collecting frame 4 is convenient to take out.

[0082] A plurality of filter holes are equidistantly formed in the bottom end of the inner wall of the collecting frame 4, and a plurality of magnet plates 8 are equidistantly embedded in the inner part of the collecting frame 4, so that the rust adsorption capacity can be enhanced, rust residues can be prevented from being accumulated in the pickling tank 1, the pickling tank 1 can be prevented from being blocked, the consumption speed of the acid liquid can be slowed down, the use cycle of the acid liquid can be prolonged, and the cost can be reduced.

[0083] A first pull ring 9 is fixedly connected to the top end of the top cover 2, a second pull ring 10 is fixedly connected to the center position of the top end of the top cover 2, and the first pull ring 9 and the second pull ring 10 can be connected through external hoisting equipment, so that the top cover 2 can be driven to reciprocate in the vertical direction.

[0084] Finally, it should be noted that: the above only describes the preferred embodiments of the present application and is not used to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacement for some technical features, and any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A high yield annealing pickling device of stainless steel, comprising a pickling tank (1), the inside of the pickling tank (1) is provided with a heating assembly (11) for controlling the temperature of acid liquid, characterized in that: The top end of the pickling tank (1) is provided with a top cover (2), and a pickling device is arranged between the top cover (2) and the pickling tank (1), the pickling device comprising: A bearing frame (3) is arranged inside the pickling tank (1); A collection frame (4) is arranged below the bearing frame (3); A transmission mechanism (5) is arranged inside the top cover (2) and used to drive the bearing frame (3) to displace up and down, the transmission mechanism (5) comprising: A motor (51) is fixedly installed at the top end of the top cover (2); Both ends of a transmission rod (52) are rotatably arranged on both sides of the inner wall of the top cover (2); A plurality of eccentric wheels (53) are fixedly and penetratingly connected with the transmission rod (52), the plurality of eccentric wheels (53) are arranged in an interlaced and symmetrical manner, and the eccentric wheels (53) are matched with a bearing mechanism (6); An extrusion roller (54) is fixedly and penetratingly connected with the transmission rod (52), and the cross section of the extrusion roller (54) is in an oval shape; A lifting assembly (55) is arranged at the top end of the bearing frame (3), and the lifting assembly (55) comprises: Slip rods (551) are arranged on both sides of the inner wall of the top cover (2), and both ends of each slip rod (551) are fixedly connected with the top end and the bottom end of the inner wall of the sliding groove; A lifting plate (552) is slidingly and penetratingly connected with the plurality of slip rods (551), and the lifting plate (552) is matched with the extrusion roller (54); Slip blocks (553) are arranged in the lifting plate (552), and the slip blocks (553) are slidingly and penetratingly connected with the inner cavities of the sliding grooves; A plurality of fixed rods (554) are fixedly connected with the bearing frame (3) at one end, and the other ends of the plurality of fixed rods (554) are fixedly connected with the plurality of slip blocks (553); A bearing mechanism (6) is arranged inside the pickling tank (1) and used to fix the collection frame (4) and drive the bearing frame (3) to displace left and right; A connecting mechanism (7) is arranged between the bearing frame (3) and the collection frame (4).

2. A high yield annealing and pickling line for stainless steel as claimed in claim 1, wherein The bearing mechanism (6) comprises: Rotating plates (61) are symmetrically arranged at the top end of the pickling tank (1), and the rotating plates (61) are slidingly and penetratingly connected with the inner cavities of the rotating grooves through rotating shafts; Pushing plates (62) are slidingly and penetratingly connected with the inner cavities of the rotating plates (61), and the opposite sides of the plurality of pushing plates (62) are provided with pushing grooves and used to limit the plurality of fixed rods (554); A plurality of tension springs (63) are equidistantly arranged inside the rotating plates (61), one end of each tension spring (63) is fixedly connected with the pushing plate (62), and the other end of the tension spring (63) is fixedly connected with the inner wall of the rotating plate (61). The top end of the pushing plate (62) is provided with an extrusion groove, the extrusion plate (64) is slidably connected with the inner cavity of the extrusion groove through the rotating plate (61), and the extrusion plate (64) is matched with the eccentric wheel (53); The extrusion block (65) is fixedly connected to the two side edges of the extrusion plate (64), the inner wall of the extrusion groove is provided with a chute on the two side edges, and the extrusion block (65) is slidably connected with the inner cavity of the chute.

3. The high yield annealing and pickling line for stainless steel strip as claimed in claim 1, wherein The connecting mechanism (7) comprises: The fixed plate (71) is fixedly connected to the two side edges of the bearing frame (3); The sleeve (72) is fixedly connected to the bottom end of the fixed plate (71); The positioning assembly (73) is arranged in the sleeve (72) and is used for connecting the collecting frame (4).

4. The high yield annealing and pickling line for stainless steel strip as claimed in claim 3, wherein The positioning assembly (73) comprises: The sliding plate (731) is located in the elastic groove; The connecting rod (732) is slidably connected with the fixed plate (71) at one end and is slidably connected with the inner cavity of the sleeve (72) at the other end, and the connecting rod (732) is fixedly connected with the sliding plate (731); The rotating disc (733) is fixedly connected to the top end of the connecting rod (732); The positioning rod (734) is fixedly connected to the top end of the fixed plate (71), the bottom end of the rotating disc (733) is provided with a plurality of positioning holes at equal intervals, and the positioning rod (734) is slidably 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), the top end of the collecting frame (4) is provided with a plurality of moving grooves at equal intervals, and the sleeve (72) and the connecting plate (735) are matched with the inner cavity of the moving groove; The compression spring (736) is sleeved outside the connecting rod (732), one end of the compression spring (736) is fixedly connected with the sliding plate (731), and the other end of the compression spring (736) is fixedly connected with the top end of the elastic groove inner wall.

5. A high yield annealing and pickling line for stainless steel as claimed in claim 4, wherein A plurality of filter holes are provided at equal intervals in the bottom end of the inner wall of the collecting frame (4), and a plurality of magnet plates (8) are embedded in the collecting frame (4) at equal intervals.

6. The high yield annealing and pickling line for stainless steel strip as claimed in claim 1, wherein The top end of the top cover (2) is fixedly connected with a first pull ring (9) at equal intervals, and the top end of the top cover (2) is fixedly connected with a second pull ring (10) at the center position.

7. A method for high yield annealing and pickling of stainless steel, applied to the device for high yield annealing and pickling of stainless steel according to any one of claims 1 to 6, characterized in that, The method comprises the following steps: S1: solid solution annealing, when a continuous annealing furnace is used, the temperature is controlled in sections, the low-temperature zone of the furnace is 900-1000 DEG C, the high-temperature zone is 1140-1190 DEG C, and the TV value is within 240; S2: mechanical descaling, a straightening and breaking scale device and a shot blasting device are used to mechanically break the rust layer on the surface of the steel strip; S3: pickling in a pickling device by HF+HNO3 mixed acid, HNO3 concentration 80-100 g / l, HF concentration 2-8 g / l, pickling temperature 45-55℃, pickling time ≥100S; S4: using heavy brushing equipment to pre-grind the plate surface.

8. The method of claim 7, wherein the stainless steel is annealed and pickled in a high yield rate. The tension of the drawing and straightening and descaling device in step S2 is set to 200-220 KN, the straightening roll pressure is set to 75-85 mm, the throw head current is set to 70-90 A, and the throw head rotation speed is set to 800-1200 rpm.

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