Cooling device for preventing oxidation after hot rolling of a steel profile

Abstract

The present application relates to a kind of hot-rolled steel after rolling cooling anti-oxidation device, belong to the cooling device field for metal rolling.The device, upper cooling system includes the lifting device of being separately arranged in the both sides of roller way, multiple groups are arranged on lifting device in conveying direction interval upper nozzle transverse movement device and the upper nozzle unit of corresponding arrangement.Lifting device is driven lifting platform lifting by lifting cylinder, and is equipped with guiding mechanism.Upper nozzle transverse movement device is driven rack and pinion by reduction motor, guiding cylinder is slid along guiding seat.Upper nozzle unit is spaced apart on the upper water pipe and is equipped with multiple inclined upper nozzles, and the nozzle of adjacent two groups upper nozzle unit is opposite, alternately arranged.Inlet pre-wetting system and outlet gas-water blowing system are separately arranged in cooling inlet end and outlet end, respectively including liftable spray beam and multiple inlet nozzles, liftable spray blowing beam and multiple air nozzle.The device is adapted to multiple kinds, multiple specifications section steel, prevents red rust from being generated from the root, significantly improves surface quality.

Description

Technical Field

[0001] This invention belongs to the field of cooling devices for metal rolling, and specifically relates to a device for cooling and preventing oxidation of hot-rolled steel sections after rolling. Background Technology

[0002] Hot-rolled steel sections are a widely used steel material with advantages such as excellent performance, ease of use, and low cost. They are widely used as structural steel in the construction industry. After rolling, rapid cooling of hot-rolled steel sections refines the grain size, improves mechanical properties, reduces the need for additional alloying elements, and further lowers costs.

[0003] However, due to the complex cross-sectional shape of the steel profile, uneven cooling is prone to occur during the cooling process, which often leads to a decrease in the mechanical properties of the steel profile, concentration of residual stress, and even serious dimensional and shape defects. In addition, cooling water is very likely to remain on the surface of the steel profile after cooling, causing surface quality defects such as red rust.

[0004] Currently, the industry has conducted numerous studies to improve the cooling rate and uniformity of rolled steel sections and enhance their mechanical properties.

[0005] In the prior art, Chinese patent application CN117123630B discloses a controlled cooling system for heavy H-beams, in which the side spray components can slide horizontally and the upper spray components can be raised and lowered. However, the upper spray components can only be raised and lowered as a whole, and the spray points of each upper nozzle cannot be adjusted independently in the width direction. When dealing with specifications with large differences in flange width, it is difficult to ensure the cooling uniformity of the upper flange across the entire width direction; moreover, it is only designed for H-beams and cannot be adapted to non-H-section varieties such as angle steel, channel steel, and bulb flat steel. Chinese patent application CN101804422B discloses an ultra-fast cooling device for large H-beams after rolling, in which the side nozzles can move horizontally, but the upper nozzles are fixed, limiting the range of specifications that can be adapted and only applicable to H-beams. Chinese patent application CN103357678B discloses a cooling device for cast and rolled H-beams. It features an air baffle at the outlet to blow away residual water. However, its upper, lower, and side nozzles are all fixedly installed, only able to rotate around the nozzle axis, and cannot be adjusted for height or lateral movement, limiting its adaptability to different specifications. Chinese patent application CN106001135B discloses a centering cooling device for a type of steel rolling mill, equipped with air nozzles to blow away cooling water at the rounded corners. However, the nozzles are all fixedly installed inside the wear-resistant chamber, making it impossible to adjust the spray position and distance according to changes in the steel profile specifications.

[0006] Current engineering applications demand a wider variety of steel profiles and specifications, placing higher demands on the process flexibility and applicability of steel profile cooling equipment. However, existing steel profile cooling devices suffer from the following common shortcomings: First, the nozzle adjustment freedom is insufficient. Most existing devices can only achieve horizontal lateral movement of the side nozzles or overall lifting and lowering of the upper nozzle, lacking the ability to independently adjust the upper nozzle in the width direction of the steel section. This makes it difficult to guarantee the cooling uniformity of the upper flange across the entire width direction when dealing with steel sections with large differences in flange width. At the same time, the nozzle adjustment dimension of existing devices lacks a decoupling relationship with the cross-sectional shape of the steel section, making it impossible to adapt to different cross-sectional shapes of steel sections such as H-beams, I-beams, channel steel, angle steel, and bulb flat steel through the same set of adjustable mechanisms.

[0007] Secondly, there is a lack of surface quality control measures. Most existing devices only focus on cooling uniformity and mechanical properties, and lack effective means to address surface quality defects such as red rust caused by residual water after cooling. A few existing technologies with purging devices (such as CN103357678B and CN106001135B) use purging as an auxiliary means of cooling, and do not combine inlet pre-wetting with outlet air-water composite purging to form a complete surface quality control system.

[0008] Third, it is difficult to balance equipment protection with adaptability to multiple product types. Most existing steel cooling devices are designed only for a single type and a few specifications of steel products. Faced with the current cooling needs of multiple types and specifications of steel, they cannot achieve rapid specification change production while ensuring cooling uniformity. In addition, when the nozzle is close to the surface of the steel, there is a risk of damage from impact by the upturned steel.

[0009] Therefore, it is necessary to design a new post-rolling cooling and anti-oxidation device for hot-rolled steel sections to address the core problem that current steel section cooling devices only target a single type of steel section and a few specifications. Summary of the Invention

[0010] In view of this, the purpose of the present invention is to provide a post-rolling cooling and anti-oxidation device that can be adapted to various types (H-beams, I-beams, channel steel, angle steel, bulb flat steel, etc.) and specifications of hot-rolled steel, while solving the problems of uneven cooling and poor surface quality of existing equipment.

[0011] To achieve the above objectives, the present invention provides the following technical solution: A post-rolling cooling and anti-oxidation device for hot-rolled steel profiles includes a lateral cooling system 1 arranged on both sides of the steel profile conveying roller device 6, an upper cooling system 2 arranged above the steel profile conveying roller device 6, a lower cooling system 3 arranged below the steel profile conveying roller device 6, and also includes an inlet pre-wetting system 4 and an outlet air-water purging system 5. The upper cooling system 2 includes a lifting device 21, an upper nozzle transverse movement device 22, and an upper nozzle unit 23; wherein, there are at least two sets of lifting devices 21, which are respectively arranged on both sides of the steel conveying roller device 6 along the steel conveying direction; there are multiple sets of upper nozzle transverse movement devices 22, which are spaced apart on the lifting devices 21 along the steel conveying direction; and the upper nozzle unit 23 is correspondingly arranged on each set of upper nozzle transverse movement devices 22. The lifting device 21 includes a lifting base 211 fixed on the installation foundation, a lifting cylinder 212 mounted on the lifting base 211, and a lifting platform 213 mounted on the lifting cylinder 212 and driven by the lifting cylinder 212. A guide mechanism 214 is provided between the lifting base 211 and the lifting platform 213. The upper nozzle transverse movement device 22 includes a guide seat 221 mounted on the lifting platform 213, a guide cylinder 222 that can slide along the axial direction of the guide seat 221 is inserted in the guide seat 221, and a rack 223 is provided on the guide cylinder 222; a reduction motor 224 is mounted on the lifting platform 213, and its output end is provided with a gear 225 that meshes with the rack 223 to drive the guide cylinder 222 to move; The upper nozzle unit 23 includes an upper water pipe 231 that passes through the guide tube 222. Multiple upper nozzles 232 are spaced apart on the upper water pipe 231. The angle between the nozzle axis of each upper nozzle 232 and the water pipe axis of the upper water pipe 231 is 30° to 60°. The nozzles of two adjacent sets of upper nozzle units 23 face opposite directions and are arranged alternately along the steel conveying direction; The inlet pre-wetting system 4 and the outlet air-water purging system 5 are respectively installed at the cooling inlet end and the cooling outlet end of the steel section conveying roller device 6. The inlet pre-wetting system 4 includes a liftable spray beam 41 and multiple inlet nozzles 42 arranged along the vertical steel section conveying direction. The outlet air-water purging system 5 includes a liftable spray beam 51 and multiple air nozzles 52 arranged along the vertical steel section conveying direction.

[0012] Furthermore, the lateral cooling system 1 includes a lateral movement device 11, a side nozzle mounting bracket 12, and a side nozzle unit 13; wherein, The transverse movement device 11 includes multiple guide rails 111, each guide rail 111 being disposed in the gap between two adjacent sets of steel conveying roller conveyor devices 6, and fixed on the mounting foundation along the direction perpendicular to the steel conveying direction via guide rail base 112; two transverse movement trolleys 113 are disposed opposite to each other on each guide rail 111, and each transverse movement trolley 113 is connected to a transverse movement hydraulic cylinder 114, which drives it to move in opposite directions or backwards along the guide rail 111; There are at least two side nozzle mounting brackets 12, which extend along the steel conveying direction and are respectively located on both sides of the steel conveying roller device 6. Each side nozzle mounting bracket 12 is installed on the corresponding side transverse trolley 113 and is driven by the corresponding side transverse hydraulic cylinder 114 to move in a direction perpendicular to the steel conveying direction. The side nozzle unit 13 includes mounting pipes 131 spaced apart on the side nozzle mounting bracket 12. Each mounting pipe 131 is provided with multiple upper side nozzles 132 and multiple lower side nozzles 133. The angle between the nozzle axis of each upper side nozzle 132 and each lower side nozzle 133 and the water pipe axis of the mounting pipe 131 is 30° to 60°.

[0013] Furthermore, each installation pipe 131 is divided into two independent water supply lines, upper and lower. The upper nozzles 132 on each side are supplied with water by the upper water supply line, and the lower nozzles 133 on each side are supplied with water by the lower water supply line.

[0014] Furthermore, the inlet pre-wetting system 4 also includes an inlet beam mounting frame 43 and a first lifting hydraulic cylinder 44. The inlet beam mounting frame 43 is fixed on the mounting base at the cooling inlet end of the steel conveying roller device 6. The two ends of the spray beam 41 are set in the guide groove of the inlet beam mounting frame 43 through the first guide wheel 45. The end of the spray beam 41 extends out of the inlet beam mounting frame 43 and is connected to the first lifting hydraulic cylinder 44.

[0015] Furthermore, an inlet water pipe 46 is provided on the lower side of the spray beam 41, and multiple inlet nozzles 42 are spaced apart on the inlet water pipe 46; each inlet nozzle 42 is inclined toward the rolling direction.

[0016] Furthermore, the outlet air-water purging system 5 also includes an outlet crossbeam mounting bracket 53 and a second lifting hydraulic cylinder 54. The outlet crossbeam mounting bracket 53 is fixed on the mounting base at the cooling outlet end of the steel conveying roller device 6. Both ends of the outlet crossbeam mounting bracket 53 are set in the guide groove of the outlet crossbeam mounting bracket 53 through the second guide wheel 55. The end of the spray crossbeam 51 extends out of the outlet crossbeam mounting bracket 53 and is connected to the second lifting hydraulic cylinder 54.

[0017] Furthermore, an outlet air inlet pipe 56 is provided on the lower side of the jet beam 51, and multiple air nozzles 52 are spaced apart on the outlet air inlet pipe 56.

[0018] Furthermore, an outlet water inlet pipe 57 is provided on the lower side of the spray beam 51, and multiple outlet nozzles 58 are spaced apart on the outlet water inlet pipe 57.

[0019] Furthermore, the lower cooling system 3 includes a lower water inlet pipe 31 and a plurality of lower nozzles 32 disposed on the lower water inlet pipe 31. There are multiple lower water inlet pipes 31, which are spaced apart between two adjacent rollers 61 in each set of conveyor roller devices 6.

[0020] Furthermore, each lower water inlet pipe 31 has at least three lower nozzles 32, which are arranged at an angle of 30° to 60°, 90°, and 120° to 150° to the horizontal axis of the lower water inlet pipe 31, respectively.

[0021] Furthermore, the side nozzle mounting bracket 12 is provided with a clearance groove 121 for passing through the guide tube 222.

[0022] Furthermore, multiple sets of upper nozzle transverse movement devices 22 are evenly spaced on the lifting device 21 along the steel conveying direction.

[0023] Furthermore, multiple upper nozzles 232 are evenly spaced.

[0024] Furthermore, guide rollers 122 are provided at both ends of the side nozzle mounting bracket 12, located at the cooling inlet end and the cooling outlet end.

[0025] Furthermore, multiple side nozzle units 13 are evenly spaced on the side nozzle mounting bracket 12 along the steel section conveying direction.

[0026] Furthermore, multiple lower water inlet pipes 31 are evenly spaced along the conveying direction of the steel profile.

[0027] The beneficial effects of this invention are as follows: (1) This scheme constructs a three-dimensional adjustment system of "side nozzle lateral movement + upper nozzle lifting + independent upper nozzle lateral movement" by using the lateral movement device in the lateral cooling system, the lifting device in the upper cooling system, and the upper nozzle lateral movement device. The three are independent of each other, so that the nozzle group can be reconstructed in three dimensions according to the cross-sectional shape and specifications of the steel section. Compared with the existing technology where the upper nozzle can only be raised and lowered as a whole, this scheme can precisely control the spray landing point of the upper nozzle, ensuring the cooling uniformity of the upper flange of the wide flange steel section in the entire width direction.

[0028] (2) This solution uses a three-dimensional adjustment system to make the same device adaptable to various cross-sectional shapes of steel, such as H-beams, I-beams, channel steel, angle steel, and bulb flat steel. Compared with existing cooling devices designed only for a single type of steel, this solution achieves universal compatibility with various types and specifications of steel.

[0029] (3) This solution constitutes a surface quality control system through the inlet pre-wetting system and the outlet air-water purging system. The inlet pre-wetting system ensures that the surface condition of the steel section is uniform before it enters the water; the outlet air-water purging system first performs cooling and then uses high-pressure compressed air from the nozzle to forcibly remove residual water. Compared with the existing technology where purging is only used as an auxiliary means of cooling, this solution prevents the formation of red rust from the source and significantly improves the surface quality.

[0030] (4) The nozzles of two adjacent upper nozzle units face opposite directions and are arranged alternately along the steel conveying direction. This can eliminate the cooling blind zone caused by single-direction spraying and make the upper surface of the steel section fully covered and uniformly cooled along the length direction. Each installation pipe is divided into two independent water supply lines, upper and lower. The spray pressure and flow rate of the upper and lower side nozzles can be adjusted according to the height of the steel section flange, so that the cooling water accurately covers different areas of the side of the steel section.

[0031] In summary, this solution utilizes a three-dimensional adjustment system of "side nozzle lateral movement + upper nozzle lifting + independent upper nozzle lateral movement" to precisely control the spray point of the upper nozzle, ensuring uniform cooling of wide-flange steel sections. Furthermore, the same system is adaptable to various types and specifications of steel sections, including H-beams, I-beams, channel steel, angle steel, and bulb flats. Simultaneously, the inlet pre-wetting system and the outlet air-water purging system form a surface quality control system, preventing red rust formation at its source and significantly improving surface quality.

[0032] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0033] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein: Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 for Figure 1 AA section view; Figure 3 for Figure 1 BB section view; Figure 4 for Figure 3 Enlarged view of Part I; Figure 5 This is a schematic diagram of the inlet pre-wetting system. Figure 6 for Figure 5 The C-direction view; Figure 7 A schematic diagram of the outlet gas-water purging system; Figure 8 for Figure 7 The D-direction view.

[0034] Figure label: 1. Side cooling system; 2. Upper cooling system; 3. Lower cooling system; 4. Inlet pre-wetting system; 5. Outlet air-water purging system; 6. Steel section conveyor roller device. In the side cooling system 1: lateral movement device 11, side nozzle mounting bracket 12, side nozzle unit 13; The transverse movement device 11 includes: guide rail 111, guide rail base 112, transverse movement trolley 113, transverse movement hydraulic cylinder 114, and hydraulic cylinder base 115. Side nozzle mounting bracket 12 includes: relief groove 121 and guide roller 122; Side nozzle unit 13 includes: mounting pipe 131, upper side nozzle 132, lower side nozzle 133; upper water supply pipe 1311, lower water supply pipe 1312; Upper cooling system 2 includes: lifting device 21, upper nozzle lateral movement device 22, and upper nozzle unit 23; The lifting device 21 includes: lifting base 211, lifting cylinder 212, lifting platform 213, guide mechanism 214; guide sleeve 2141, guide rod 2142; The upper nozzle transverse movement device 22 includes: guide seat 221, guide cylinder 222, rack 223, reduction motor 224, and gear 225; Upper nozzle unit 23 includes: upper water pipe 231 and upper nozzle 232; The lower cooling system 3 includes: lower water inlet pipe 31 and lower nozzle 32; The inlet pre-wetting system 4 includes: spray beam 41, inlet nozzle 42, inlet beam mounting bracket 43, first lifting hydraulic cylinder 44, first guide wheel 45, and inlet water pipe 46. The outlet air-water purging system 5 includes: a jet beam 51, an air nozzle 52, an outlet beam mounting bracket 53, a second lifting hydraulic cylinder 54, a second guide wheel 55, an outlet air inlet pipe 56, an outlet water inlet pipe 57, and an outlet nozzle 58.

[0035] In the steel section conveyor roller device 6: roller 61. Detailed Implementation

[0036] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0037] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0038] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0039] Please see Figures 1 to 8 The hot-rolled steel section cooling and anti-oxidation device provided in this solution includes a lateral cooling system 1 arranged on both sides of the steel section conveyor roller device 6, an upper cooling system 2 arranged above the steel section conveyor roller device 6, a lower cooling system 3 arranged below the steel section conveyor roller device 6, and an inlet pre-wetting system 4 and an outlet air-water purging system 5 arranged at the cooling inlet and cooling outlet ends of the steel section conveyor roller device 6. This device is connected to the steel section production line through the steel section conveyor roller device 6. Driven by the conveyor roller device 6, the steel section passes through the inlet pre-wetting system 4, the lateral cooling system 1, the upper cooling system 2, the lower cooling system 3, and the outlet air-water purging system 5 along the conveying direction (longitudinal direction) to complete the post-rolling cooling and surface anti-oxidation treatment.

[0040] The system includes: a lateral cooling system 1 for cooling the web and flanges from both sides of the steel section; an upper cooling system 2 for cooling the inner flange, R-section, and upper surface of the web from above the steel section; a lower cooling system 3 for cooling the lower surface of the web, the inner flange, and the lower R-section from below the steel section; an inlet pre-wetting system 4 for pre-wetting the surface of the steel section before it enters the main cooling zone; and an outlet air-water purging system 5 for finishing the cooling process after cooling is complete, and then forcibly blowing away any remaining water in the grooves and corners of the steel section using high-pressure compressed air.

[0041] The lateral cooling system 1 in this scheme includes a lateral movement device 11, a side nozzle mounting bracket 12, and a side nozzle unit 13.

[0042] The transverse movement device 11 drives the side nozzle mounting bracket 12 to move horizontally along the direction perpendicular to the steel section conveying direction (lateral), thereby adjusting the distance between the upper / lower side nozzles and the side of the steel section to accommodate steel sections of different widths. The transverse movement device 11 includes multiple guide rails 111, each guide rail 111 being positioned at the gap between two adjacent sets of steel section conveying roller conveyor devices 6 and fixed to the mounting base along the direction perpendicular to the steel section conveying direction via guide rail bases 112. Two transverse movement trolleys 113 are arranged opposite each other on each guide rail 111, and each transverse movement trolley 113 is connected to a transverse movement hydraulic cylinder 114, which drives it to move towards or away from the guide rail 111. By using two transverse movement trolleys 113 arranged opposite each other, the side nozzle mounting brackets 12 on both sides of the steel section can synchronously move closer to or further away from the steel section, ensuring consistent cooling distance on both sides. Each of the transverse hydraulic cylinders 114 here is mounted on a hydraulic cylinder base 115, which, like the guide rail base 112, is fixed to the mounting foundation.

[0043] In this embodiment, there are two side nozzle mounting brackets 12, extending along the steel section conveying direction and respectively located on both sides of the steel section conveying roller device 6. Each side nozzle mounting bracket 12 is correspondingly mounted on the lateral trolley 113 on the corresponding side and is driven by the lateral hydraulic cylinder 114 on the corresponding side to move perpendicular to the steel section conveying direction. The side nozzle mounting bracket 12 is provided with a clearance groove 121 for passing through the guide cylinder 222 of the upper cooling system 2 to avoid interference between the lateral cooling system 1 and the upper cooling system 2 during operation. Guide rollers 122 are provided at both ends of the side nozzle mounting bracket 12 at the cooling inlet end and the cooling outlet end for guiding and centering the steel section to prevent the steel section from deviating during conveying.

[0044] The side nozzle unit 13 includes multiple mounting pipes 131 evenly spaced along the steel profile conveying direction on the side nozzle mounting bracket 12. Each mounting pipe 131 is equipped with two upper side nozzles 132 and three lower side nozzles 133. The angle α between the nozzle axis of each upper side nozzle 132 and each lower side nozzle 133 and the water pipe axis of the mounting pipe 131 is 30° to 60°. Each mounting pipe 131 is divided into upper and lower independent water supply lines. The upper side nozzles 132 are supplied with water by the upper water supply line 1311, and the lower side nozzles 133 are supplied with water by the lower water supply line 1312. Through independent upper and lower water supply, the spray pressure and flow rate of the upper side nozzles 132 and the lower side nozzles 133 can be adjusted according to the flange height of the steel profile, so that the cooling water can accurately cover different areas of the side of the steel profile.

[0045] The upper cooling system 2 in this scheme includes a lifting device 21, an upper nozzle lateral movement device 22, and an upper nozzle unit 23.

[0046] The lifting device 21 is used to drive the upper nozzle unit 23 mounted thereon to move up and down as a whole, so as to adjust the vertical distance between the upper nozzle 232 and the upper surface of the steel section, so as to adapt it to steel sections with different cross-sectional height specifications. There are at least two sets of lifting devices 21, which are respectively arranged on both sides of the steel section conveying roller device 6 along the steel section conveying direction. The lifting device 21 includes a lifting base 211 fixed on the mounting foundation, a lifting cylinder 212 set on the lifting base 211, and a lifting platform 213 set on the lifting cylinder 212 and driven by the lifting cylinder 212. The lifting platform 213 here, like the side nozzle mounting frame 12, also extends along the steel section conveying direction.

[0047] A guide mechanism 214 is provided between the lifting base 211 and the lifting platform 213 to provide guidance when the lifting cylinder 212 drives the lifting platform 213 to move up and down, ensuring that the lifting platform 213 moves smoothly in the vertical direction without deflection or jamming. In this embodiment, there are two sets of guide mechanisms 214, symmetrically arranged on both sides of the lifting cylinder 212 to ensure that the lifting platform 213 is subjected to balanced force. Each guide mechanism 214 includes a guide sleeve 2141 and a guide rod 2142. The guide sleeve 2141 is fixed on the lifting base 211, and the upper end of the guide rod 2142 is fixed on the lifting platform 213, while the lower end is inserted into the guide sleeve 2141. When the lifting cylinder 212 drives the lifting platform 213 to move up and down, the guide rod 2142 slides synchronously along the axial direction of the guide sleeve 2141, thereby limiting the movement of the lifting platform 213 to only the vertical direction and preventing it from shifting horizontally or tilting.

[0048] Multiple sets of upper nozzle lateral movement devices 22 are evenly spaced on the lifting platform 213 of the lifting device 21 along the steel section conveying direction. These devices drive the upper nozzle unit 23 to move independently laterally along the width direction of the steel section, adjusting the spray point of the upper nozzle 232 on the upper surface of the steel section to accommodate steel sections with different flange widths. The upper nozzle lateral movement device 22 includes a guide seat 221 mounted on the lifting platform 213. A guide cylinder 222, which can slide axially along the guide seat 221, is inserted inside the guide seat 221. A rack 223 is located at the bottom of the guide cylinder 222. A reduction motor 224 is mounted on the lifting platform 213, and its output end has a gear 225 that meshes with the rack 223 to drive the guide cylinder 222 to move laterally. This rack and pinion transmission provides high transmission accuracy and fast response, enabling precise adjustment of the spray point of the upper nozzle 232.

[0049] The upper nozzle unit 23 is correspondingly installed on each group of upper nozzle transverse moving devices 22, including an upper water pipe 231 passing through the guide cylinder 222, with multiple upper nozzles 232 spaced apart on the upper water pipe 231. The angle β between the nozzle axis of each upper nozzle 232 and the water pipe axis of the upper water pipe 231 is 30° to 60°. The nozzles of adjacent groups of upper nozzle units 23 face opposite directions and are arranged alternately along the steel section conveying direction. The alternating arrangement can eliminate the cooling blind zone caused by single-direction spraying, so that the upper surface of the steel section can be uniformly cooled along the length direction.

[0050] The lower cooling system 3 includes a lower water inlet pipe 31 and multiple lower nozzles 32 disposed on the lower water inlet pipe 31. Multiple lower water inlet pipes 31 are evenly spaced along the steel section conveying direction between adjacent rollers 61 within each set of conveying roller devices 6. The lower nozzles 32 spray cooling from below the steel section onto the lower surface of the web, the inner side of the lower flange, and the lower R-section, forming a three-dimensional surround cooling system for the steel section cross-section together with the upper cooling system 2 and the lateral cooling system 1.

[0051] In this embodiment, the lower water inlet pipe 31 includes two side pipe sections located on both sides of the steel conveying roller device 6, a bottom horizontal pipe section located below the steel conveying roller device 6, and a middle pipe section extending upward from the bottom horizontal pipe section in the gap between two adjacent rollers. A top pipe section is provided on the middle pipe section and arranged horizontally. Multiple lower nozzles 32 are evenly spaced on the top pipe section. The lower water inlet pipe 31 here has an overall I-shaped structure.

[0052] Each lower water inlet pipe 31 has three lower nozzles 32, which are arranged at inclinations of 30°–60°, 90°, and 120°–150° to the horizontal axis of the lower water inlet pipe 31, respectively. Among them, the lower nozzle 32 with an included angle of 90° is vertically upward and aligned with the lower surface of the web of the steel section, while the two lower nozzles with included angles of 30°–60° and 120°–150° are respectively oriented towards the two sides of the steel section, aligned with the inner side of the lower flange and the lower R angle.

[0053] The inlet pre-wetting system 4 is installed at the cooling inlet end of the steel section conveyor roller device 6. It is used to pre-wet the surface of the steel section before it enters the main cooling zone, so that the surface state of the steel section is more uniform before entering the water and to remove floating dust from the surface of the incoming material.

[0054] The inlet pre-wetting system 4 of this solution includes a liftable spray beam 41, multiple inlet nozzles 42 arranged along the vertical direction (transverse) of the steel section conveying, an inlet beam mounting frame 43, and a first lifting hydraulic cylinder 44. The inlet beam mounting frame 43 is fixed on the mounting base at the cooling inlet end of the steel section conveying roller device 6. The two ends of the spray beam 41 are set in the guide groove of the inlet beam mounting frame 43 through first guide wheels 45. The ends of the spray beam 41 extend out of the inlet beam mounting frame 43 and are connected to the first lifting hydraulic cylinder 44. By driving the spray beam 41 up and down along the guide groove through the first lifting hydraulic cylinder 44, the distance between the inlet nozzles 42 and the surface of the steel section can be adjusted to accommodate steel sections of different heights and specifications.

[0055] An inlet water pipe 46 is provided on the lower side of the spray beam 41, and multiple inlet nozzles 42 are evenly spaced on the inlet water pipe 46, with each inlet nozzle 42 inclined towards the rolling direction. By using an inclined spray towards the rolling direction, the pre-wetting water mist can evenly cover the front area of ​​the steel section in the direction of its movement, thereby improving the pre-wetting effect.

[0056] The outlet air-water purging system 5 is installed at the cooling outlet end of the steel conveyor roller device 6. After cooling is completed, the outlet nozzle 58 is used to finish the cooling process, and then the high-pressure compressed air is sprayed out through the air nozzle 52 to force the water remaining in the grooves and corners of the steel to be blown away, thus preventing the formation of red rust from the source.

[0057] The outlet air-water purging system 5 includes a liftable spray beam 51, multiple air nozzles 52 arranged along the vertical direction (transverse) of the steel section conveying, an outlet beam mounting frame 53, and a second lifting hydraulic cylinder 54. The outlet beam mounting frame 53 is fixed to the mounting base at the cooling outlet end of the steel section conveying roller device 6. Both ends of the spray beam 51 are set in the guide groove of the outlet beam mounting frame 53 via second guide wheels 55. The ends of the spray beam 51 extend out of the outlet beam mounting frame 53 and are connected to the second lifting hydraulic cylinder 54. The second lifting hydraulic cylinder 54 drives the spray beam 51 to move up and down along the guide groove, which can adjust the distance between the air nozzles 52 and the outlet nozzles 58 and the surface of the steel section to accommodate steel sections of different heights and specifications.

[0058] An outlet air inlet pipe 56 is provided on the lower side of the spray beam 51, and multiple air nozzles 52 are spaced apart on the outlet air inlet pipe 56. An outlet water inlet pipe 57 is also provided on the lower side of the spray beam 51, and multiple outlet nozzles 58 are spaced apart on the outlet water inlet pipe 57. During operation, the steel profile is first cooled by the outlet nozzles 58, and then high-pressure compressed air is sprayed by the air nozzles 52 to completely blow away any residual water in the grooves and corners of the steel profile.

[0059] The working process of this device is as follows: Driven by the conveyor roller device 6, the steel section moves along the conveying direction. First, it passes through the inlet pre-wetting system 4, where inlet nozzles 42 pre-wet the surface of the steel section, ensuring a uniform surface condition before immersion in water. Then, the steel section enters the main cooling zone. The side upper nozzles 132 and lower nozzles 133 of the lateral cooling system 1 cool the steel section from both sides, the upper nozzles 232 of the upper cooling system 2 cool the steel section from above, and the lower nozzles 32 of the lower cooling system 3 cool the steel section from below. Together, these three systems form a three-dimensional, enveloping cooling effect on the steel section's cross-section. After cooling, the steel section passes through the outlet air-water purging system 5. The outlet nozzles 58 first complete the cooling process, and then high-pressure compressed air is sprayed from the air nozzles 52 to thoroughly remove any remaining water, ultimately yielding a hot-rolled steel section product with excellent mechanical properties and surface quality.

[0060] When adapting to different specifications of steel sections, the adjustment method of this device is as follows: Side cooling system 1: The lateral trolley 113 is driven to move along the guide rail 111 by the lateral hydraulic cylinder 114, which drives the side nozzle mounting bracket 12 to move in a direction perpendicular to the steel section conveying direction, and adjusts the distance between the side nozzle and the side of the steel section; the spray pressure and flow rate of the upper side nozzle 132 and the lower side nozzle 133 are adjusted by the upper and lower independent water supply pipelines respectively.

[0061] Upper cooling system 2: The lifting platform 213 is driven to move up and down by the lifting cylinder 212 to adjust the vertical distance between the upper nozzle 232 and the upper surface of the steel section; the gear 225 is driven to rotate by the reduction motor 224, which drives the rack 223 and the guide cylinder 222 to slide along the guide seat 221 axially to adjust the spray point of the upper nozzle 232 in the width direction of the steel section.

[0062] Inlet pre-wetting system 4: The spray beam 41 is driven to move up and down along the guide groove by the first lifting hydraulic cylinder 44, adjusting the distance between the inlet nozzle 42 and the surface of the steel profile.

[0063] The outlet air-water purging system 5: drives the jet beam 51 to move up and down along the guide groove through the second lifting hydraulic cylinder 54, and adjusts the distance between the air nozzle 52 and the outlet nozzle 58 and the surface of the steel profile.

[0064] Through the above adjustments, this device can be adapted to the post-rolling cooling requirements of various types and specifications of hot-rolled steel, such as H-beams, I-beams, channel steel, angle steel, and bulb flat steel.

[0065] The following is a specific example for verification: The finished hot-rolled H-beam has dimensions of H440×300×11×18 and is made of Q355B steel.

[0066] Based on the specifications of the H-beam, the device is adjusted as follows: The lateral hydraulic cylinder 114 of the lateral cooling system 1 drives the lateral trolley 113 to move along the guide rail 111, so that the lateral nozzle mounting brackets 12 on the left and right sides (lateral) are moved laterally to a distance of 950mm between the lateral nozzle mounting pipes 131, so as to ensure that the distance from the lateral nozzle units 13 on both sides to the outer side of the H-beam flange meets the cooling requirements.

[0067] The lifting cylinder 212 of the upper cooling system 2 drives the lifting platform 213 to rise or fall, so that the upper nozzle unit 23 is raised or lowered to a position 260mm away from the upper side of the web of the H-beam; at the same time, the reduction motor 224 of the upper nozzle lateral movement device 22 drives the gear 225 to rotate, causing the rack 223 and the guide cylinder 222 to slide along the axial (lateral) direction of the guide seat 221, so that the upper nozzle unit 23 is moved laterally to a position 73mm away from the center line of the roller table, so as to ensure that the spray point of the upper nozzle 232 covers the inside of the flange of the H-beam and the upper R-angle area.

[0068] After finishing rolling, the hot-rolled H-beams are conveyed to the entrance of the device by roller conveyor, and then transported into the device by conveyor roller conveyor device 6.

[0069] Ten sets of side nozzle units 13, eight sets of upper nozzle units 23, and nine sets of lower water inlet pipes 31 are activated. Among them, each set of side nozzle units 13 activates only six lower side nozzles 133, mainly cooling the outer side of the H-beam flange; each set of upper nozzle units 23 activates four upper nozzles 232, mainly cooling the inner side of the H-beam flange and the upper R-angle; each set of lower water inlet pipes 31 activates three lower nozzles 32, mainly cooling the lower side of the H-beam web and the lower R-angle.

[0070] The inlet pre-wetting system 4 continuously sprays high-pressure water onto the surface of the H-beam to prevent the cooling water from flowing back along the direction of movement of the H-beam. The outlet air-water purging system 5 continuously purges the surface of the H-beam with high-pressure air to dry any residual cooling water.

[0071] The total cooling water volume is 700 m³ / h, and the water pressure is 1.2 MPa.

[0072] The hot-rolled H-beam has an inlet temperature of 850℃ for the flanges and 800℃ for the web, with a rolling speed of 3m / s. The total length of the post-rolling cooling and anti-oxidation device for the hot-rolled steel is 15.4m. After rapid cooling, the H-beam's flange temperature is 560℃, and the upper web temperature is 530℃.

[0073] After natural air cooling, the hot-rolled H-beams showed less flaking of red rust and iron oxide scale, and the surface quality was significantly improved compared to the air-cooled samples. Mechanical property testing was conducted on samples, revealing a yield strength of 512 MPa, a tensile strength of 643 MPa, and an elongation of 23.6%. Both mechanical properties and surface quality met the requirements.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A post-rolling cooling and anti-oxidation device for hot-rolled steel sections, comprising a lateral cooling system (1) arranged on both sides of a steel section conveying roller device (6), an upper cooling system (2) arranged above the steel section conveying roller device (6), and a lower cooling system (3) arranged below the steel section conveying roller device (6), characterized in that: It also includes an inlet pre-wetting system (4) and an outlet air-water purging system (5); The upper cooling system (2) includes a lifting device (21), an upper nozzle transverse movement device (22), and an upper nozzle unit (23); wherein, there are at least two sets of lifting devices (21), which are respectively arranged on both sides of the steel conveying roller device (6) along the steel conveying direction; there are multiple sets of upper nozzle transverse movement devices (22), which are spaced apart on the lifting devices (21) along the steel conveying direction; and the upper nozzle unit (23) is correspondingly arranged on each set of upper nozzle transverse movement devices (22); The lifting device (21) includes a lifting base (211) fixed on the installation foundation, a lifting cylinder (212) installed on the lifting base (211), and a lifting platform (213) installed on the lifting cylinder (212) and driven by the lifting cylinder (212). A guide mechanism (214) is provided between the lifting base (211) and the lifting platform (213). The upper nozzle transverse movement device (22) includes a guide seat (221) mounted on the lifting platform (213), a guide cylinder (222) that can slide along the axial direction of the guide seat (221) is inserted in the guide seat (221), and a rack (223) is provided on the guide cylinder (222); a reduction motor (224) is mounted on the lifting platform (213), and its output end is provided with a gear (225) that meshes with the rack (223) to drive the guide cylinder (222) to move; The upper nozzle unit (23) includes an upper water pipe (231) passing through the guide tube (222), and multiple upper nozzles (232) are spaced apart on the upper water pipe (231). The angle between the nozzle axis of each upper nozzle (232) and the water pipe axis of the upper water pipe (231) is 30° to 60°. The nozzles of two adjacent upper nozzle units (23) face opposite directions and are arranged alternately along the steel conveying direction; The inlet pre-wetting system (4) and the outlet air-water purging system (5) are respectively installed at the cooling inlet end and the cooling outlet end of the steel section conveying roller device (6). The inlet pre-wetting system (4) includes a liftable spray beam (41) and multiple inlet nozzles (42) arranged along the vertical steel section conveying direction. The outlet air-water purging system (5) includes a liftable spray beam (51) and multiple air nozzles (52) arranged along the vertical steel section conveying direction.

2. The post-rolling cooling and anti-oxidation device for hot-rolled steel sections according to claim 1, characterized in that: The side cooling system (1) includes a lateral movement device (11), a side nozzle mounting bracket (12), and a side nozzle unit (13); wherein, The transverse movement device (11) includes multiple guide rails (111), each guide rail (111) is respectively set in the gap between two adjacent sets of steel conveying roller devices (6), and is fixed on the mounting base along the direction perpendicular to the steel conveying direction through the guide rail base (112); two transverse movement trolleys (113) are arranged opposite to each other on each guide rail (111), and each transverse movement trolley (113) is connected to a transverse movement hydraulic cylinder (114), which drives it to move in opposite directions or backwards along the guide rail (111); There are at least two side nozzle mounting brackets (12), which extend along the steel conveying direction and are respectively located on both sides of the steel conveying roller device (6). Each side nozzle mounting bracket (12) is installed on the corresponding side transverse trolley (113) and is driven by the corresponding side transverse hydraulic cylinder (114) to move along the direction perpendicular to the steel conveying direction. The side nozzle unit (13) includes mounting tubes (131) spaced apart on the side nozzle mounting bracket (12). Each mounting tube (131) is provided with multiple upper side nozzles (132) and multiple lower side nozzles (133). The angle between the nozzle axis of each upper side nozzle (132) and each lower side nozzle (133) and the water pipe axis of the mounting tube (131) is 30° to 60°.

3. The post-rolling cooling and anti-oxidation device for hot-rolled steel sections according to claim 2, characterized in that: Each installation pipe (131) is divided into two independent water supply lines, upper and lower. The upper nozzles (132) on each side are supplied with water by the upper water supply line, and the lower nozzles (133) on each side are supplied with water by the lower water supply line.

4. The post-rolling cooling and anti-oxidation device for hot-rolled steel sections according to claim 1, characterized in that: The inlet pre-wetting system (4) also includes an inlet beam mounting frame (43) and a first lifting hydraulic cylinder (44). The inlet beam mounting frame (43) is fixed on the mounting base of the cooling inlet end of the steel conveying roller device (6). The two ends of the spray beam (41) are set in the guide groove of the inlet beam mounting frame (43) through the first guide wheel (45). The end of the spray beam (41) extends out of the inlet beam mounting frame (43) and is connected to the first lifting hydraulic cylinder (44).

5. The post-rolling cooling and anti-oxidation device for hot-rolled steel sections according to claim 4, characterized in that: The lower side of the spray beam (41) is provided with an inlet water pipe (46), and multiple inlet nozzles (42) are spaced apart on the inlet water pipe (46); each inlet nozzle (42) is inclined toward the rolling direction.

6. The post-rolling cooling and anti-oxidation device for hot-rolled steel sections according to claim 1, characterized in that: The outlet air-water purging system (5) also includes an outlet crossbeam mounting bracket (53) and a second lifting hydraulic cylinder (54). The outlet crossbeam mounting bracket (53) is fixed on the mounting base of the cooling outlet end of the steel conveying roller device (6). The two ends of the outlet crossbeam mounting bracket (53) are set in the guide groove of the outlet crossbeam mounting bracket (53) through the second guide wheel (55). The end of the spray crossbeam (51) extends out of the outlet crossbeam mounting bracket (53) and is connected to the second lifting hydraulic cylinder (54).

7. The post-rolling cooling and anti-oxidation device for hot-rolled steel sections according to claim 6, characterized in that: An outlet air inlet pipe (56) is provided on the lower side of the jet beam (51), and multiple air nozzles (52) are spaced apart on the outlet air inlet pipe (56).

8. The post-rolling cooling and anti-oxidation device for hot-rolled steel sections according to claim 7, characterized in that: The lower side of the jet beam (51) is also provided with an outlet water inlet pipe (57), and multiple outlet nozzles (58) are spaced apart on the outlet water inlet pipe (57).

9. The post-rolling cooling and anti-oxidation device for hot-rolled steel sections according to claim 1, characterized in that: The lower cooling system (3) includes a lower water inlet pipe (31) and multiple lower nozzles (32) disposed on the lower water inlet pipe (31). There are multiple lower water inlet pipes (31), which are spaced apart between two adjacent rollers (61) in each set of conveyor roller devices (6).

10. The post-rolling cooling and anti-oxidation device for hot-rolled steel sections according to claim 2, characterized in that: The side nozzle mounting bracket (12) is provided with a relief groove (121) for passing through the guide tube (222).

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