A rolling process and device for hot-rolled steel strip with ultra-thin specifications

Abstract

The present invention provides a rolling process for hot-rolled steel strips of ultra-thin specifications, comprising the following steps: S1, heat treatment of steel billets; S2, rough rolling treatment; S3, finishing rolling treatment; S4, laminar cooling treatment; S5, coiling after forming, to obtain ultra-thin steel strips. The scheme ultimately realizes the use of seven rough rolling processes and seven finishing processes, and adds correction equipment and cleaning devices between adjacent finishing rolling units, so that cleaning and maintenance can be performed after each rolling in the process of continuous finishing rolling, so as to keep the surface of the steel strip clean during rolling, improve the flatness of the ultra-thin steel strip after rolling and forming, and ensure the yield rate of the ultra-thin steel strip. The rolling thickness of the front-end process is relatively large, and the rolling thickness of the back-end process is reduced, so as to improve the stability of the steel strip rolling and maintain the quality of the steel strip.

Description

Technical Field

[0001] The invention relates to the technical field of hot-rolled steel strip processing, and in particular to a rolling process and a device for hot-rolled steel strips with extremely thin specifications. Background Art

[0002] Hot rolling is to use slab as raw material, and after heating, it is made into strip steel by roughing mill and finishing mill. In the hot rolling mill, the finishing mill is usually composed of six or seven four-roll mills, each of which includes two upper and lower roll systems, and each roll system includes a backup roll and a working roll. In the usual hot rolling mill, the upper and lower rolls of the hot rolling finishing mill adopt centralized transmission, that is, the upper and lower rolls have the same rotation angular velocity.

[0003] In the continuous production process of steel strips, in order to improve equipment utilization and production efficiency, the co-production of various metal materials has become a development trend in hot rolling production. That is to say, a hot rolling production line is used to produce both ordinary steel varieties and stainless steel or some special non-ferrous metals.

[0004] In order to optimize the rolling process of ultra-thin hot-rolled steel strips, the existing technology adopts a rolling method of 6 rough rolling passes and 7 finishing rolling passes, which avoids defects such as steel strip tail rolling, surface oxide scale intrusion, pits, pits, voids, waves, and rolling waste that occur in the process of preparing the steel strip, and improves the yield rate. However, in this method, during the rolling of adjacent finishing rolling units, water washing and cleaning are mostly used between the two finishing rolling units, which has a great impact on the temperature of the steel strip finishing rolling. How to reduce the impact on temperature during continuous finishing rolling needs to be further optimized.

[0005] Therefore, it is necessary to provide a rolling process and device for ultra-thin hot-rolled steel strip to solve the above technical problems. Summary of the invention

[0006] The present invention provides a rolling process for ultra-thin hot-rolled steel strips, which solves the problem in the related art of how to reduce the influence of cleaning on the temperature of the steel strips during the rolling of ultra-thin hot-rolled steel strips.

[0007] In order to solve the above technical problems, the present invention provides a rolling process for ultra-thin hot-rolled steel strip, comprising the following steps:

[0008] S1, heat treatment of steel billet, the billet enters the heating furnace for heating;

[0009] S2, rough rolling treatment;

[0010] S3, finishing rolling treatment, using a finishing rolling mill consisting of at least 7 finishing mills to carry out finishing rolling, the steel strip after rough rolling treatment is finished rolling, the first pass of finishing rolling has a starting rolling temperature of 1080-1120°C, the seventh pass of final rolling has a temperature of 920-980°C, and the thickness of the steel strip after rolling is 0.1-0.5mm. Correction equipment and cleaning devices are added between adjacent finishing rolling mills to provide entrance and exit guides for the transmission of steel strips between adjacent finishing rolling mills. After the guides, the cleaning device is used to clean the passing steel strips to obtain extremely thin steel strips;

[0011] S4, laminar cooling treatment;

[0012] S5, after forming, is rolled up to produce extremely thin steel strip.

[0013] Preferably, in step S1, the length of the steel billet should be ≤9200 mm, the heating temperature of the steel billet is controlled within the range of 1220-1260° C., and the time within the heating temperature range is controlled within the range of 30 min-40 min.

[0014] Preferably, in step S1, a segmented heating method is adopted in the heating furnace, and the residual heat in the furnace is used to preheat the steel billet to be heated, thereby increasing the temperature of the steel billet to be heated before entering the furnace and reducing the heating time and energy consumption after entering the furnace.

[0015] Preferably, during the rough rolling treatment in step S2, the starting rolling temperature of the rough rolling is 1160-1200°C, a seven-pass vertical rolling structure is selected, the final rolling temperature is 1100-1150°C, the first pass reduction rate is 25.2%, the second pass reduction rate is controlled at 25.6%, the third pass reduction rate is controlled at 27.8%, the fourth pass reduction rate is controlled at 26.1%, the fifth pass reduction rate is controlled at 23.4%, the sixth pass reduction rate is controlled at 20.1%, and the final rolling reduction rate is 18.2%, thereby obtaining a rough-rolled steel plate with an intermediate billet thickness of 1.5-1.8 mm.

[0016] Preferably, during the finish rolling treatment in step S3, the reduction rates of each pass F1 to F7 are respectively F1: 38.2%, F2: 35.6%, F3: 33.5%, F4: 30.8%, F5: 24.8%, F6: 20.2%, and F7: 18.5%.

[0017] Preferably, during the finishing rolling process in step S3, a shearing unit is additionally installed at the output end of the F7 finishing rolling unit, and the shearing unit is used to remove the head and tail of the steel strip after finishing rolling.

[0018] The present invention also provides a rolling device for ultra-thin hot-rolled steel strip, which is used for rolling production in the rolling process for ultra-thin hot-rolled steel strip, comprising:

[0019] At least seven finishing mills and at least six straightening mills;

[0020] The straightening unit is installed between two adjacent groups of finishing mills;

[0021] The straightening unit includes a mounting frame, a telescopic member, a connecting frame, a straightening plate, a connecting cover, a lifting frame, a brush plate and a connecting spring. The mounting frame is fixedly mounted on the top of the two groups of finishing mills, and a fixed pulley is fixedly mounted on the mounting frame. A telescopic member is fixedly mounted on the mounting frame, and the output end of the telescopic member passes through the mounting frame, and the output end of the telescopic member is slidably connected to the mounting frame. The output end of the telescopic member is fixedly mounted with a connecting frame, a straightening plate is fixedly mounted on the bottom of the connecting frame, a telescopic hole is provided on the straightening plate, a connecting cover is fixedly mounted on the top of the straightening plate, and the top of the connecting cover is fixedly mounted on one end of the traction steel cable, the other end of the traction steel cable passes through the surface of the fixed pulley and is connected to the lifting frame, the lifting frame is slidably mounted in the connecting cover, a brush plate is fixedly mounted on the bottom of the lifting frame, and the size of the brush plate matches the size of the telescopic hole.

[0022] Preferably, one end of a connecting spring is fixedly mounted on the top of the lifting frame, the other end of the connecting spring is fixedly mounted on the connecting cover, and the connecting spring is sleeved on the outside of the traction steel cable.

[0023] Preferably, a connecting slide hole is provided on the connecting cover, and the connecting slide hole is connected to the inside of the connecting cover; the rolling device for ultra-thin hot-rolled steel strip also includes a cooling unit, and the cooling unit includes a cooling fan and an air duct, and the cooling fan is fixedly mounted on the connecting cover, and the output end of the cooling fan is fixedly mounted with an air duct, and the output end of the air duct passes through the connecting cover, and the output end of the air duct is connected to the inside of the connecting cover.

[0024] Preferably, a through hole is provided on the lifting frame, and the input end of the through hole matches the output end of the air guide pipe. The rolling device for ultra-thin hot-rolled steel strip further includes:

[0025] A delivery pipe, wherein the delivery pipe is fixedly mounted on the lifting frame, an input end of the delivery pipe is connected with an output end of the through hole, and the delivery pipe passes through the connecting sliding hole and extends to the outside of the connecting cover;

[0026] A nozzle is connected to the output end of the conveying pipe, and the output end of the nozzle is inclined toward the output direction of the brush plate.

[0027] Compared with the related art, the rolling process for ultra-thin hot-rolled steel strip provided by the present invention has the following beneficial effects:

[0028] A seven-pass rough rolling process and a seven-pass finishing rolling process are adopted, and correction equipment and cleaning devices are added between adjacent finishing rolling units to achieve continuous finishing rolling. Cleaning and maintenance can be carried out after each rolling, keeping the surface clean during steel strip rolling, improving the flatness of ultra-thin steel strip after rolling and ensuring the yield rate of ultra-thin steel strip. The rolling thickness of the front stage process is relatively large, and the rolling thickness of the back stage process is reduced, which improves the stability of steel strip rolling and can maintain the quality of the steel strip. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0030] Figure 1 A process flow chart of a rolling process for ultra-thin hot-rolled steel strip provided by the present invention;

[0031] Figure 2 A schematic structural diagram of a first embodiment of a rolling device for hot-rolled ultra-thin steel strip provided by the present invention;

[0032] Figure 3 for Figure 2 The structural schematic diagram of the correction unit part shown;

[0033] Figure 4 for Figure 3 a left side view of the whole shown;

[0034] Figure 5 for Figure 3 A cross-sectional view of the connecting cover portion shown;

[0035] Figure 6 for Figure 5 The structural schematic diagram of the brush plate working state shown;

[0036] Figure 7 A working principle diagram of a rolling device for hot-rolled steel strips with ultra-thin specifications provided by the present invention;

[0037] Figure 8 A schematic structural diagram of a second embodiment of a rolling device for hot-rolled ultra-thin steel strip provided by the present invention;

[0038] Fig. 9 for Figure 8 A cross-sectional view of the lifting frame connection portion shown;

[0039] Fig.10 for Fig. 9 a right side view of the nozzle portion shown;

[0040] Fig.11 for Fig. 9 A schematic structural diagram of another embodiment of the lifting frame is shown.

[0041] Description of Figure Numbers:

[0042] 1. Finishing mill;

[0043] 2. Correction unit, 21. Mounting frame, 211. Fixed pulley, 22. Telescopic member, 23. Connecting frame, 24. Correction plate, 241. Telescopic hole, 25. Connecting cover, 251. Traction steel rope, 252. Connecting sliding hole, 26. Lifting frame, 261. Through hole, 262. Heat exchange hole, 27. Brush plate, 28. Connecting spring;

[0044] 3. Cooling unit, 31. Cooling fan, 32. Air duct;

[0045] 4. Delivery pipe;

[0046] 5. Nozzle.

[0047] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0048] 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.

[0049] The invention provides a rolling process for hot-rolled steel strips with extremely thin specifications.

[0050] Please refer to Figure 1 In a first embodiment of the present invention, a rolling process for ultra-thin hot-rolled steel strip comprises the following steps:

[0051] S1, heat treatment of steel billet, the billet enters the heating furnace for heating;

[0052] S2, rough rolling treatment;

[0053] S3, finishing rolling treatment, using a finishing rolling mill consisting of at least 7 finishing rolling mills to carry out finishing rolling, the steel strip after rough rolling treatment is finished rolling, the first pass of finishing rolling has a starting rolling temperature of 1080-1120°C, the seventh pass of final rolling has a temperature of 920-980°C, the thickness of the steel strip after rolling is 0.1-0.5mm, and correction equipment and cleaning devices are added between adjacent finishing rolling mills to provide entrance and exit guides for the transmission of steel strips between adjacent finishing rolling mills, and the cleaning device is used to clean the passing steel strips after the guides;

[0054] S4, laminar cooling treatment;

[0055] S5, after forming, is rolled up to produce extremely thin steel strip.

[0056] In the step S1, the length of the steel billet should be ≤9200 mm, the heating temperature of the steel billet is controlled within the range of 1220-1260° C., and the time within the heating temperature range is controlled within the range of 30 min-40 min.

[0057] In step S1, a segmented heating method is adopted in the heating furnace, and the residual heat in the furnace is used to preheat the steel billet to be heated, thereby increasing the temperature of the steel billet to be heated before entering the furnace and reducing the heating time and energy consumption after entering the furnace.

[0058] During the rough rolling treatment in step S2, the starting rolling temperature of the rough rolling is 1160-1200°C, a seven-pass vertical rolling structure is selected, the final rolling temperature is 1100-1150°C, the first pass reduction rate is 25.2%, the second pass reduction rate is controlled at 25.6%, the third pass reduction rate is controlled at 27.8%, the fourth pass reduction rate is controlled at 26.1%, the fifth pass reduction rate is controlled at 23.4%, the sixth pass reduction rate is controlled at 20.1%, and the final rolling reduction rate is 18.2%, thereby obtaining an intermediate billet of a rough-rolled steel plate, and the thickness of the intermediate billet is 1.5-1.8 mm.

[0059] During the finish rolling process in step S3, the reduction ratios of each pass F1 to F7 are respectively F1: 38.2%, F2: 35.6%, F3: 33.5%, F4: 30.8%, F5: 24.8%, F6: 20.2%, and F7: 18.5%.

[0060] During the finishing process in step S3, a shearing unit is additionally installed at the output end of the F7 finishing mill. The shearing unit is used to remove the head and tail of the steel strip after finishing rolling. Compared with the existing method of adding a shearing unit between finishing rolling and rough rolling, it can effectively avoid the uneven head and tail caused by finishing rolling after shearing, and ensure the flatness of the head and tail of the steel strip after finishing rolling.

[0061] The rolling process for ultra-thin hot-rolled steel strip provided in this embodiment has the following beneficial effects:

[0062] A seven-pass rough rolling process and a seven-pass finishing rolling process are adopted, and correction equipment and cleaning devices are added between adjacent finishing rolling units to achieve continuous finishing rolling. Cleaning and maintenance can be carried out after each rolling, keeping the surface clean during steel strip rolling, improving the flatness of ultra-thin steel strip after rolling and ensuring the yield rate of ultra-thin steel strip. The rolling thickness of the front stage process is relatively large, and the rolling thickness of the back stage process is reduced, which improves the stability of steel strip rolling and can maintain the quality of the steel strip.

[0063] Please refer to Figures 2 to 7 The present invention also provides a rolling device for ultra-thin hot-rolled steel strips, which is used in the production process of finishing rolling in the rolling process for ultra-thin hot-rolled steel strips.

[0064] Embodiment 1:

[0065] A rolling device for hot-rolled steel strip with extremely thin specifications, comprising:

[0066] At least seven finishing mills 1 and at least six straightening mills 2;

[0067] The straightening machine group 2 is installed between two adjacent groups of finishing mills 1;

[0068] The straightening unit 2 includes a mounting frame 21, a telescopic member 22, a connecting frame 23, a straightening plate 24, a connecting cover 25, a lifting frame 26, a brush plate 27 and a connecting spring 28. The mounting frame 21 is fixedly mounted on the top of the two groups of finishing mills 1, and a fixed pulley 211 is fixedly mounted on the mounting frame 21. The telescopic member 22 is fixedly mounted on the mounting frame 21. The output end of the telescopic member 22 passes through the mounting frame 21, and the output end of the telescopic member 22 is slidably connected to the mounting frame 21. The output end of the telescopic member 22 is fixedly mounted with a connecting frame 23. A correction plate 24 is fixedly installed at the bottom of the connecting frame 23, and a telescopic hole 241 is opened on the correction plate 24. A connecting cover 25 is fixedly installed on the top of the correction plate 24. The top of the connecting cover 25 is fixedly installed on one end of the traction steel cable 251. The other end of the traction steel cable 251 passes through the fixed pulley 211 and is fixed to the top of the lifting frame 26. The lifting frame 26 is slidably installed in the connecting cover 25. A brush plate 27 is fixedly installed at the bottom of the lifting frame 26. The size of the brush plate 27 matches the size of the telescopic hole 241.

[0069] During the continuous rolling and threading process, when the steel strip passes through the finishing mill 1 in the finishing mill group, the diameter of the roller part of the finishing mill 1 will change after long-term use, resulting in different degrees of warping of the steel strip after rolling, and there is a trend of accumulating the degree of warping from frame to frame. When the degree of warping exceeds a certain degree and directly leads to the inability to enter the downstream frame normally, threading failure will occur and the steel strip will be scrapped. Therefore, it is necessary to provide guidance and correction support for the steel strip when it is threaded between the finishing mills 1.

[0070] After heating and rough rolling, the steel strip is prone to produce oxide scale or dust impurities that adhere to the strip and need to be cleaned. Traditionally, the surface of the strip is washed with water to remove dust and oxide impurities on the surface of the steel strip. However, the surface temperature of the steel strip is very high. Washing with water will cause the temperature of the strip to change drastically, resulting in changes in the properties of the strip. Therefore, the steel strip in the finishing process must be cleaned stably and reliably.

[0071] By installing the correction unit 2 between adjacent finishing mills 1, the correction unit 2 can conveniently control the lifting and lowering adjustment of the correction plate 24 through the telescopic part 22. The correction plate 24 can provide entrance and exit guides for the steel strip transmitted from one group of finishing mills 1 to the next group of finishing mills 1, maintain the stability of the steel strip during transmission between adjacent finishing mills 1, and prevent the steel strip from warping. After the steel strip enters the next group of finishing mills 1, the correction plate 24 moves up, and the lifting frame 26 automatically moves down and fits on the surface of the steel strip, which is used to clean and maintain the surface of the steel strip after correction.

[0072] The telescopic part 22 can adopt an electric telescopic rod, which uses a power source connected to the outside world to provide a power source for the connecting frame 23 to provide a power source for the lifting and lowering adjustment, thereby providing a power source for the lifting and lowering adjustment of the correction plate 24. The upward movement of the correction plate 24 can effectively avoid the temperature influence caused by the continuous contact between the correction plate 24 and the steel belt, thereby extending the service life of the correction plate 24.

[0073] The other end of the traction cable 251 passes through the connection cover 25 and extends into the connection cover 25, and the traction cable 251 is slidably connected to the connection cover 25. The traction cable 251 is connected to the lifting frame 26 and the connection cover 25 through the fixed pulley 211, so that when the connection cover 25 moves up, the lifting frame 26 moves down, and the lifting frame 26 drives the brush plate 27 to move down and can clean and maintain the steel strip. When the connection cover 25 moves down, the lifting frame 26 moves up, and the connection cover 25 provides correction support for the steel strip that needs to enter the next group of finishing mills 1, and the lifting frame 26 can automatically retract upward.

[0074] The traction cable 251 is made of stainless steel rope, which is stable and high temperature resistant.

[0075] The connecting cover 25 is in communication with the telescopic hole 241 , so that the brush plate 27 can pass through the telescopic hole 241 and be lifted or lowered relatively.

[0076] Wherein, the correction plate 24 and the brush plate 27 are both made of high temperature resistant materials.

[0077] One end of a connecting spring 28 is fixedly mounted on the top of the lifting frame 26, and the other end of the connecting spring 28 is fixedly mounted on the connecting cover 25. The connecting spring 28 is sleeved on the outside of the traction steel cable 251. The connecting spring 28 is used to connect the lifting frame 26 and the traction steel cable 251, and can provide elastic buffering force when contact occurs between the brush plate 27 and the steel belt. In conjunction with the traction and lifting of the traction steel cable 251, the contact pressure between the brush plate 27 and the steel belt can be controlled.

[0078] See also Figure 5 and Figure 6 When the lifting frame 26 is moved up and retracted, the connecting spring 28 is in a compressed state. When the lifting frame 26 is moved down and used, the connecting spring 28 is in a compressed state.

[0079] set up Figure 6 When the brush plate 27 has come into contact with the surface of the steel belt, the correction plate 24 moves up, the traction steel cable 251 is relaxed, and the top end of the connecting spring 28 moves up with the connecting cover 25, but the connecting spring 28 is still in a compressed state. At this time, the connecting spring 28 provides downward pressure on the lifting frame 26, and the lifting frame 26 can drive the brush plate 27 to be pressed against the surface of the steel belt, thereby realizing pressure adjustment. The degree of downward pressure is affected by the elastic force of the connecting spring 28.

[0080] The working principle of the rolling device for hot-rolled ultra-thin steel strip provided in this embodiment is as follows:

[0081] A1, see Figure 7 Before the leading end of the steel strip enters the first group of finishing mills 1, the telescopic member 22 is started, and the telescopic member 22 drives the correction plate 24 to move downward through the connecting frame 23, and the brush plate 27 moves upward and retracts, and the correction plate 24 moves downward to the steel strip conveying plane, providing stable conveying support for the steel strip, and preventing the steel strip entering the finishing mill 1 from warping;

[0082] A2, after the leading end of the steel strip is rolled by the first group of finishing mills 1, it stably enters the input port of the second group of finishing mills 1 through the brush plate 27, and the telescopic member 22 corresponding to the first group of finishing mills 1 is started. The telescopic member 22 drives the correction plate 24 to move upward through the connecting frame 23, and the connecting cover 25 moves upward. The traction steel cable 251 provides support for the lifting frame 26 to move downward. The brush plate 27 passes through the telescopic hole 241 and contacts the surface of the steel strip. When the steel strip moves, it contacts the brush plate 27, and friction occurs between the brush plate 27 and the steel strip, and the oxidized impurities on the steel strip are scraped off;

[0083] A3, the steel strip passes through the second group of finishing mills 1, the third group of finishing mills 1, the fourth group of finishing mills 1, the fifth group of finishing mills 1, the sixth group of finishing mills 1 and the seventh group of finishing mills 1 in sequence, and the brush plates 27 corresponding to the six groups are all moved down and the surface of the rolled steel strip is cleaned between two adjacent groups of finishing mills 1;

[0084] A4, when the tail end of the steel strip enters the sixth group of finishing mills, the first five groups of correction plates 24 move down to the working state, and the brush plates 27 move up to the retracted state;

[0085] A5, same as step A1, when the tail end of the steel strip is completely separated from the seventh group of finishing mills 1, the brush plate 27 cleans one group of steel strips, starts the last group of telescopic parts 22, and the correction plate 24 moves down to provide support for the entry of the next group of steel strips. When the correction plate 24 moves down, the brush plate 27 automatically moves up and enters the cooling mode to prevent the brush plate 27 from affecting the transportation of the steel strip.

[0086] Embodiment 2:

[0087] Please refer to Figures 8 to 11 Based on the rolling device for ultra-thin hot-rolled steel strip provided in Example 1 of the present invention, another rolling device for ultra-thin hot-rolled steel strip is provided in Example 2 of the present invention. Example 2 is only a preferred embodiment of Example 1, and the implementation of Example 2 will not affect the independent implementation of Example 1.

[0088] Specifically, the rolling device for ultra-thin hot-rolled steel strip provided in Embodiment 2 of the present invention is different in that a connecting slide hole 252 is provided on the connecting cover 25, and the connecting slide hole 252 is connected to the inside of the connecting cover 25;

[0089] The rolling device for ultra-thin hot-rolled steel strip also includes a cooling unit 3, which includes a cooling fan 31 and an air duct 32. The cooling fan 31 is fixedly mounted on the connecting cover 25, and the air duct 32 is fixedly mounted on the output end of the cooling fan 31. The output end of the air duct 32 passes through the connecting cover 25, and the output end of the air duct 32 is connected to the inside of the connecting cover 25.

[0090] The cooling unit 3 can provide cooling and blowing support to the correction plate 24 in the working state on the one hand, and can also blow air to cool the brush plate 27 on the lifting frame 26 when the brush plate 27 is in the retracted state on the other hand.

[0091] Please see here Figure 8 When in use, the cooling fan 31 is connected to an external power source to provide a cooling air source for the air duct 32. The air duct 32 can transmit air to the inside of the connecting cover 25. The air entering the connecting cover 25 can both cool the correction plate 24 and blow cool the brush plate 27 after it is folded.

[0092] In an alternative manner, the cooling fan 31 may also be an air pump device.

[0093] In an optional manner, a through hole 261 is provided on the lifting frame 26, and the input end of the through hole 261 matches the output end of the air guide pipe 32. The rolling device for ultra-thin hot-rolled steel strip further includes:

[0094] The delivery pipe 4 is fixedly mounted on the lifting frame 26, the input end of the delivery pipe 4 is connected with the output end of the through hole 261, and the delivery pipe 4 passes through the connecting sliding hole 252 and extends to the outside of the connecting cover 25;

[0095] The nozzle 5 is connected to the output end of the conveying pipe 4 , and the output end of the nozzle 5 is inclined toward the output direction of the brush plate 27 .

[0096] When the lifting frame 26 moves downward and the brush plate 27 is in working state, the output end of the air guide tube 32 is connected with the input end of the through hole 261, and the through hole 261 conveys air to the nozzle 5 through the conveying pipe 4. The nozzle 5 sprays and blows the cleaned surface of the steel strip to achieve re-cleaning of the steel strip surface after cleaning, thereby reducing impurities on the surface of the steel strip entering the finishing process of the next group of finishing mills 1.

[0097] In this embodiment, there are two blowing states:

[0098] See also Figure 8 In the first blowing state, the correction plate 24 moves downward, the brush plate 27 moves upward and is retracted, the air duct 32 is connected to the connection cover 25, and the blowing port of the air duct 32 can cool the connection cover 25 and the retracted brush plate 27;

[0099] See also Fig. 9 In the second blowing state, the correction plate 24 moves up, the brush plate 27 moves down and enters the working state, the output end of the air guide tube 32 is connected with the through hole 261, and the output end of the nozzle 5 can discharge air normally, which is used to blow the surface of the steel strip after being cleaned by the brush plate 27 to maintain the cleanliness of the surface of the steel strip.

[0100] See also Fig.10 At least eight groups of nozzles 5 are provided, and one group of nozzles 5 corresponds to one group of delivery pipes 4 .

[0101] See also Fig.11In an alternative solution to the through hole 261, a heat exchange hole 262 is provided on the lifting frame 26, and the middle portion of the heat exchange hole 262 is a U-shaped structure. The heat exchange hole 262 of the U-shaped structure facilitates heat exchange for the incoming air, which on the one hand reduces the temperature of the lifting frame 26, and on the other hand increases the temperature of the air blown by the nozzle 5, thereby avoiding the influence of low-temperature blowing on the finish rolling of the steel strip and reducing heat loss.

[0102] Since the heat exchange hole 262 extends downward and is close to the brush plate 27, it can absorb the temperature of the brush plate 27 and the lifting frame 26 to achieve air heat exchange, and then blow it out from the nozzle 5 after the heat exchange, thereby achieving cooling between the lifting frame 26 and the brush plate 27 while reducing the impact of the sudden drop in temperature caused by the external air blowing directly onto the surface of the steel strip.

[0103] The working principle of the rolling device for hot-rolled ultra-thin steel strip provided in this embodiment is as follows:

[0104] B1, when the correction plate 24 moves downward and the brush plate 27 moves upward, the cooling fan 31 is started, and the air guide 32 delivers the cooling air source to the connection cover 25 to cool the brush plate 27 and the connection cover 25 after the retracted brush plate 27, and the cooled air flows out from the connection slide hole 252;

[0105] B2, when the correction plate 24 moves upward and the brush plate 27 moves downward, the output end of the air guide tube 32 is connected with the through hole 261;

[0106] B3, start the cooling fan 31, the cooling air source output by the air guide pipe 32 passes through the through hole 261, the conveying pipe 4 and the nozzle 5 in sequence, and finally the nozzle 5 blows air to clean the cleaned surface of the steel strip.

[0107] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A rolling device for hot-rolled steel strip with ultra-thin specifications, characterized in that: include: At least seven finishing mills and at least six straightening mills; The straightening unit is installed between two adjacent groups of finishing mills; The straightening unit includes a mounting frame, a telescopic member, a connecting frame, a straightening plate, a connecting cover, a lifting frame, a brush plate and a connecting spring. The mounting frame is fixedly mounted on the top of the two groups of finishing mills, and a fixed pulley is fixedly mounted on the mounting frame. A telescopic member is fixedly mounted on the mounting frame, and the output end of the telescopic member passes through the mounting frame, and the output end of the telescopic member is slidably connected to the mounting frame. The output end of the telescopic member is fixedly mounted with a connecting frame, a straightening plate is fixedly mounted on the bottom of the connecting frame, a telescopic hole is provided on the straightening plate, a connecting cover is fixedly mounted on the top of the straightening plate, and the top of the connecting cover is fixedly mounted on one end of the traction steel cable, the other end of the traction steel cable passes through the surface of the fixed pulley and is connected to the lifting frame, the lifting frame is slidably mounted in the connecting cover, a brush plate is fixedly mounted on the bottom of the lifting frame, and the size of the brush plate matches the size of the telescopic hole.

2. The rolling device for ultra-thin hot-rolled steel strip according to claim 1, characterized in that: The top of the lifting frame is fixedly mounted on one end of a connecting spring, the other end of the connecting spring is fixedly mounted on the connecting cover, and the connecting spring is sleeved on the outside of the traction steel cable.

3. The rolling device for ultra-thin hot-rolled steel strip according to claim 2, characterized in that: A connecting slide hole is provided on the connecting cover, and the connecting slide hole is communicated with the inside of the connecting cover; the rolling device for ultra-thin hot-rolled steel strip also includes a cooling unit, and the cooling unit includes a cooling fan and an air duct. The cooling fan is fixedly mounted on the connecting cover, and an air duct is fixedly mounted on the output end of the cooling fan. The output end of the air duct passes through the connecting cover, and the output end of the air duct is communicated with the inside of the connecting cover.

4. The rolling device for ultra-thin hot-rolled steel strip according to claim 3, characterized in that: The lifting frame is provided with a through hole, the input end of the through hole matches the output end of the air guide pipe, and the rolling device for ultra-thin hot-rolled steel strip also includes: A delivery pipe, wherein the delivery pipe is fixedly mounted on the lifting frame, an input end of the delivery pipe is connected with an output end of the through hole, and the delivery pipe passes through the connecting sliding hole and extends to the outside of the connecting cover; A nozzle is connected to the output end of the conveying pipe, and the output end of the nozzle is inclined toward the output direction of the brush plate.

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