Hot rolling device for hot rolling of wire rods and hot rolling process thereof

Abstract

The present application relates to hot rolling technology field of hot rolled rod, and disclose a kind of hot rolling equipment of hot rolled rod and its hot rolling process, including conveying mechanism, the upper and lower sides of the conveying mechanism are symmetrically provided with two groups of air cooling component one and air cooling component two, which are fixedly installed with air cooling component two;Two groups of air cooling component one are symmetrically arranged on the upper and lower sides of air cooling component two respectively;The regulating mechanism is fixedly connected on the conveying mechanism, and the regulating mechanism corresponds to air cooling component one and air cooling component two, and the detection assembly is fixedly installed on the air cooling component one on the upper side.The cooperation between conveying mechanism, air cooling component one, air cooling component two, regulating mechanism and detection assembly can realize the air cooling of hot rolled rod lap joint point and non lap joint point, and the hot rolled rod lap joint point and non lap joint point area can be accurately obtained in real time according to the heat distribution, and the dynamic uniform cooling of hot rolled rod can be realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hot-rolled wire rod hot rolling, in particular to a hot-rolled wire rod hot rolling equipment and a hot-rolling process thereof. BACKGROUND

[0002] High-line coil screw is a small type of screw reinforcement, which is widely used in the construction of infrastructure such as houses, bridges and roads. The yield strength, strength-to-ductility ratio and maximum tensile elongation of high-line coil screw material are the most critical mechanical property parameters of coil screw, which determine the safety of coil screw material in use.

[0003] Among them, the existing hot-rolled wire rod hot rolling process is: electric furnace smelting, LF refining, square billet protective casting, square billet heating, rough rolling, medium rolling, pre-precision rolling, pre-water cooling, precision rolling unit, water cooling, wire drawing, air cooling roller, however, when the hot-rolled wire rod is cooled in the air cooling roller, since the wire drawing machine is in a stacked state when it is outwardly discharged, the cooling rate is different in the two cases of lap joints and non-lap joints, and this uneven cooling will lead to the following problems in the same coil:

[0004] Inhomogeneous metallographic structure: the slow-cooled areas may generate coarse pearlite or even bainite, while the fast-cooled areas generate fine pearlite and ferrite.

[0005] Mechanical property fluctuation: the yield strength, tensile strength, especially the maximum total elongation (Agt) and the strength-to-ductility ratio differ greatly within the same coil, the performance stability is poor, and it is difficult to meet the stringent requirements of the new national standard (such as GB / T1499.2-2024) on performance consistency.

[0006] Moreover, the traditional hot rolling process has insufficient control ability for harmful elements such as phosphorus (P) and sulfur (S), and excessive P content directly leads to the cold brittleness (rapid decrease in toughness at low temperature) and plasticity index of the steel, therefore, the present application proposes a hot-rolled wire rod hot rolling equipment and a hot-rolling process to solve the above technical defects. SUMMARY

[0007] The present application aims to provide a hot-rolled wire rod hot rolling equipment and a hot-rolling process to solve the problems raised in the background art.

[0008] To achieve the above-mentioned purpose, the present application provides the following technical solution: a hot-rolled wire rod hot rolling equipment, comprising a conveying mechanism, the upper and lower sides of the conveying mechanism are fixedly installed with uniformly distributed air cooling components one and two, the air cooling components two are symmetrically provided with two groups with respect to the air cooling components one on the upper and lower sides;

[0009] The conveying mechanism is fixedly connected with uniformly distributed regulating mechanisms corresponding to the air cooling components one and two.

[0010] The regulating mechanism comprises a support plate, a rotating component, an air duct and a moving component. The outer side of the conveying mechanism is fixedly connected with uniformly distributed support plates. The regulating mechanism is provided with a rotating component. The rotating component is provided with an air duct comprising air pipe two and air pipe one. The air pipe two is symmetrically arranged about the air pipe one. The moving component is connected between the rotating component and the air pipe two.

[0011] The heat distribution of the hot-rolled wire rod conveyed on the inner side of the conveying mechanism is detected by the detection component. The hot-rolled wire rod is dynamically air-cooled and cooled by the air cooling components one and two and the regulating mechanism according to the heat distribution.

[0012] Further, the conveying mechanism comprises a machine body, a hot-rolled air cooling shell, a motor one, conveying rollers, bearing seats, gear one, gear two, a chain wheel and a chain. The outer side of the machine body is fixedly provided with the hot-rolled air cooling shell. The inner side of the machine body is fixedly connected with the motor one through a rectangular block. The inner side of the machine body is rotatably connected with uniformly distributed conveying rollers. The both ends of the conveying rollers are provided with bearing seats which are fixedly connected with the inner side of the conveying mechanism. The output end of the motor one is fixedly connected with gear one. One end of a group of the conveying rollers is fixedly connected with gear two. The gear one is engaged with the gear two. One end of the conveying roller is fixedly connected with the chain wheel. The chain wheels on adjacent conveying rollers are cross-distributed. The adjacent chain wheels are driven by the chain.

[0013] The formed hot-rolled wire rod is put on the conveying rollers. The motor one is started to drive the gear one to rotate. The gear one drives the gear two to rotate. The gear two drives a group of the conveying rollers fixedly connected therewith to rotate. The conveying rollers drive the chain wheels fixedly connected therewith to rotate at the same time. Then, the conveying rollers at different positions are synchronously rotated by the driving of the chain. The formed hot-rolled wire rod is continuously transported forward.

[0014] Further, the air cooling components one and two are symmetrically arranged above and below the conveying rollers.

[0015] Further, the air cooling component one comprises a fan one and a metal hose one. The hot-rolled air cooling shell is fixedly provided with uniformly distributed fans one. The air outlet of the fan one is fixedly connected with the metal hose one.

[0016] The detection component comprises a thermal imaging detector and a mounting plate. The outer side of the fan one is fixedly connected with the mounting plate. The mounting plate is fixedly connected with the thermal imaging detector.

[0017] The thermal imaging detector is started, a rectangular slot corresponding to the thermal imaging detector is arranged on the air cooling shell of the hot rolling, the thermal imaging detector detects the formed hot rolling wire on the conveying roller, the thermal imaging detector uses an infrared detector to receive the infrared radiation of the formed hot rolling wire, converts the infrared radiation into an electric signal representing the temperature, and finally processes the electric signal into a thermal image visible to the naked eye, so that the heat distribution of the stacked hot rolling wire can be obtained, and the distribution of the lap joint points and non-lap joint points of the hot rolling wire can be indirectly obtained according to the heat distribution, and the distribution area of the hot rolling wire on the conveying roller can be obtained.

[0018] The air cooling assembly two comprises a fan two and a metal hose two, and the fan two is uniformly arranged on the hot rolling air cooling shell.

[0019] The metal hose one is connected with the air pipe one, and the metal hose two is connected with the air pipe two.

[0020] Further, the rotating assembly comprises a motor two, a rotating shaft and a rotating plate, the motor two is fixedly connected to one side of the supporting plate, the output end of the motor two is fixedly connected with the rotating shaft, and the other end of the rotating shaft is fixedly connected with the rotating plate.

[0021] Further, the air duct comprises a fixed block and a sliding block, the center of the rotating plate is fixedly connected with the fixed block, one side of the fixed block is fixedly connected with the air pipe one, and the inner side of the rotating plate is slidably connected with the sliding block.

[0022] Further, the moving assembly comprises a pushing cylinder, a pushing rod, a cover plate and a connecting barrel, the side, away from the air pipe one, of the air pipe two is fixedly connected with the connecting barrel, the inner side of the connecting barrel is provided with the pushing rod, the connecting barrel is provided with the cover plate, the cover plate is used for limiting the pushing rod, the rotating plate is fixedly connected with the pushing cylinder, and the output end of the pushing cylinder is fixedly connected with the pushing rod.

[0023] The pushing cylinder is started, the pushing cylinder pushes the pushing rod, and the air pipe two on both sides is driven by the connecting barrel to move inward or outward under the guidance of the sliding block, so that the air pipe two can be accurately moved to the lap joint area of the hot rolling wire, and dynamic air cooling is realized on each area of the hot rolling wire.

[0024] The motor two is started at the same time, the motor two drives the rotating shaft to rotate, the rotating shaft drives the rotating plate to rotate, and then the air pipe one and the air pipe two are synchronously rotated back and forth, so that the air force swings back and forth, and the air cooling effect is improved.

[0025] The effect of uniform cooling of the hot-rolled wire rod is realized, and the temperature drop and temperature drop rate of the hot-rolled wire rod can be monitored in real time.

[0026] Further, the air pipe one and the air pipe two each comprise an air guide group, the air guide group comprises an air guide pipe, a mounting ring one, a mounting groove, and a mounting ring two, the air guide pipe is provided with the mounting groove, the outer side of the mounting groove is provided with the mounting ring one and the mounting groove, the mounting ring one and the mounting groove are fixed to the air guide pipe through screws, the mounting ring two at the air pipe one is fixedly connected with the fixed block, and the mounting ring two at the air pipe two is fixedly connected with the sliding block.

[0027] The fans one and two are started, the fans one and two generate air force through the corresponding metal hoses one and two, the air force enters the air pipe one and the air pipe two, and then the air force blows out through the air guide pipe, so that the hot-rolled wire rod on the conveying roller is air-cooled from top to bottom.

[0028] According to the distribution of the hot-rolled wire rod lap joint points and non-lap joint points and the distribution of the hot-rolled wire rod on the conveying roller, the power of the fans one and two is controlled, so that the air force blown out by the air pipe one is small, corresponding to the non-lap joint point area of the hot-rolled wire rod, and the air force blown out by the air pipe two is large, corresponding to the lap joint area of the hot-rolled wire rod.

[0029] The hot-rolled air-cooled shell is provided with movable grooves corresponding to the air pipe one, the air pipe two and the rotating assembly, and is also provided with heat dissipation grooves corresponding to the air pipe one and the air pipe two.

[0030] A hot-rolled wire rod hot-rolling process, comprising the following steps:

[0031] S1, smelting and continuous casting: adopting electric furnace smelting, LF refining and square billet protective casting process to obtain continuous casting square billet;

[0032] S2, heating: heating the continuous casting square billet in a heating furnace to an out-of-furnace temperature of 1100±10℃;

[0033] S3, rolling and cooling: sequentially performing rough rolling, intermediate rolling and pre-precision rolling on the heated square billet, then cooling through a high-pressure pre-water-penetration device with a pressure of 1.2 megapascals, and guiding through a first group of Morgan guide grooves to make the rolled piece temperature drop to 960℃ and then enter the finishing rolling unit, effectively improving the yield tensile strength of 20 megapascals;

[0034] S4, finishing rolling: completing rolling in the finishing rolling unit, and the finished product is rolled out from the 26th rack, and the finishing rolling final rolling temperature is not higher than 1100℃;

[0035] S5, spinning and air cooling: the rolled piece after finishing rolling is cooled by water to control the spinning temperature, and the hot rolled wire rod after spinning is cooled in the conveying mechanism, and the hot rolled wire rod is dynamically cooled through the air cooling assembly one, the air cooling assembly two, the regulating mechanism and the detection assembly.

[0036] Further, the chemical composition of the continuous casting billet obtained in S1 is 0.24-0.25% of C, 0.33-0.41% of Si, 0.85-0.93% of Mn, ≤0.045% of P, and ≤0.045% of S, by mass percentage.

[0037] C: 0.24-0.25%, Si: 0.33-0.41%, Mn: 0.85-0.93%, P: ≤0.045%, S: ≤0.045%,

[0038] The carbon equivalent Ceq is 0.38-0.44%.

[0039] Compared with the prior art, the present application provides a hot rolled wire rod hot rolling equipment and its hot rolling process, which has the following beneficial effects:

[0040] 1. The present application realizes the dynamic uniform cooling of the hot rolled wire rod by the cooperation between the conveying mechanism, the air cooling assembly one, the air cooling assembly two, the regulating mechanism and the detection assembly, and solves the technical problems of uneven metallographic structure and mechanical property fluctuation in the prior art, improves the finished product quality of the hot rolled wire rod, and at the same time, adopts the pipeline air guide mode, changes the existing fan direct air cooling mode, makes the wind force more concentrated, and adopts up and down air cooling at the same time, greatly improves the air cooling efficiency.

[0041] 2. The present application adopts the "V" chemical composition design and combines the precise controlled rolling and controlled cooling technology, successfully reduces the alloy cost, ensures that the yield strength, tensile strength and elongation of the hot rolled steel bar can meet the requirements of the hot rolled ribbed steel bar, effectively reduces the cost of the enterprise, reasonably controls the content of harmful elements such as S, and improves the toughness of the steel. DETAILED DESCRIPTION

[0042] Figure 1 It is a schematic diagram of the three-dimensional structure of the equipment of the present application;

[0043] Figure 2 It is an enlarged schematic diagram of A in the present application Figure 1

[0044] Figure 3 It is a combined schematic diagram of the three-dimensional structure of the air cooling assembly one and the air cooling assembly two of the present application;

[0045] Figure 4 It is a schematic diagram of the three-dimensional structure of the support plate of the present application; ​

[0046] Figure 5 This is a three-dimensional structural diagram of the rotating component of the present invention;

[0047] Figure 6 This is a cross-sectional three-dimensional structural diagram of the rotating plate of the present invention;

[0048] Figure 7 For the present invention Figure 6 Enlarged view of point B in the middle;

[0049] Figure 8 This is an exploded three-dimensional structural diagram of the air duct of the present invention;

[0050] Figure 9 For the present invention Figure 8 Enlarged view of point C in the middle;

[0051] Figure 10 This is a three-dimensional structural diagram of the conveying mechanism of the present invention;

[0052] Figure 11 This is a three-dimensional structural diagram of the conveyor roller of the present invention;

[0053] Figure 12 For the present invention Figure 11 Enlarged view of point D in the middle;

[0054] Figure 13 This is a table showing the chemical composition ratio of the hot-rolled wire rod of the present invention.

[0055] In the diagram: 1. Conveying mechanism; 11. Machine body; 12. Hot-rolled air-cooled housing; 13. Motor 1; 14. Conveying roller; 15. Bearing housing; 16. Gear 1; 17. Gear 2; 18. Sprocket; 19. Chain; 2. Air-cooled assembly 1; 21. Fan 1; 22. Metal hose 1; 3. Air-cooled assembly 2; 31. Fan 2; 32. Metal hose 2; 4. Control mechanism; 41. Support plate; 42. Rotating assembly; 421. Motor 2; 42 2. Rotating shaft; 423. Rotating plate; 43. Air duct; 431. Fixed block; 432. Sliding block; 433. Air duct component one; 434. Air duct component two; 44. Moving assembly; 441. Push cylinder; 442. Push rod; 443. Cover plate; 444. Connecting cylinder; 5. Detection assembly; 51. Thermal imaging detector; 52. Mounting plate; 6. Air guide assembly; 61. Air guide duct; 62. Mounting ring one; 63. Mounting groove; 64. Mounting ring two. Detailed Implementation

[0056] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of protection of the present application. Embodiments

[0057] Please refer to Figures 1-13 A hot-rolled wire rod hot-rolling device comprises a conveying mechanism 1, and the upper and lower sides of the conveying mechanism 1 are fixedly provided with uniformly distributed air-cooling assemblies 2 and 3, and the air-cooling assembly 3 is symmetrically provided with two groups with respect to the air-cooling assembly 2 on the upper and lower sides.

[0058] The conveying mechanism 1 is fixedly connected with uniformly distributed regulating mechanisms 4, the regulating mechanisms 4 correspond to the air-cooling assemblies 2 and 3, and the upper air-cooling assembly 2 is fixedly provided with a detection assembly 5.

[0059] The regulating mechanism 4 comprises a support plate 41, a rotating assembly 42, an air duct 43 and a moving assembly 44, the outer side of the conveying mechanism 1 is fixedly connected with the support plate 41, the rotating assembly 42 is arranged on the regulating mechanism 4, the air duct 43 is arranged on the rotating assembly 42, the air duct 43 comprises air pipe pieces 434 and 433, the air pipe piece 434 is symmetrically arranged with respect to the air pipe piece 433, and the moving assembly 44 is connected between the rotating assembly 42 and the air pipe piece 434.

[0060] The heat distribution of the hot-rolled wire rod conveyed on the inner side of the conveying mechanism 1 is detected by the detection assembly 5, and the hot-rolled wire rod is dynamically air-cooled and cooled by the air-cooling assemblies 2 and 3 and the regulating mechanisms 4 according to the heat distribution.

[0061] Further, the conveying mechanism 1 comprises a machine body 11, a hot-rolled air-cooled shell 12, a motor 1 13, conveying rollers 14, bearing seats 15, gears 1 and 2 16 and 17, sprockets 18 and chains 19, the outer side of the machine body 11 is fixedly provided with the hot-rolled air-cooled shell 12, the inner side of the machine body 11 is fixedly connected with the motor 1 13 through a rectangular block, the inner side of the machine body 11 is rotatably connected with the uniformly distributed conveying rollers 14, the two ends of each conveying roller 14 are fixedly provided with the bearing seat 15, the bearing seat 15 is fixedly connected with the inner side of the conveying mechanism 1, the output end of the motor 1 13 is fixedly connected with the gear 1 16, one end of one group of the conveying rollers 14 is fixedly connected with the gear 2 17 on the outer side, the gear 1 16 is engaged with the gear 2 17, one end of the conveying roller 14 is fixedly connected with the sprocket 18 on the outer side, the sprockets 18 on the adjacent conveying rollers 14 are cross-distributed, and the adjacent sprockets 18 are driven through the chains 19.

[0062] The formed hot-rolled wire rod is fed onto the conveyor roller 14. The motor 13 is started, and the motor 13 drives the gear 16 to rotate. The gear 16 meshes with the gear 17 to rotate. The gear 17 drives a set of conveyor rollers 14 that are fixedly connected to it to rotate. While the conveyor rollers 14 are rotating, they also drive the sprocket 18 that is fixedly connected to them to rotate. Then, the chain 19 drives the conveyor rollers 14 at various points to rotate synchronously, thereby continuously transporting the formed hot-rolled wire rod forward.

[0063] Furthermore, the air-cooled assembly 12 and the air-cooled assembly 23 are arranged symmetrically above and below the conveyor roller 14.

[0064] Furthermore, the air-cooled assembly 2 includes a fan 21 and a metal hose 22. The hot-rolled air-cooled housing 12 is fixedly installed with evenly distributed fans 21, and the air outlet of the fans 21 is fixedly connected to the metal hose 22.

[0065] The detection component 5 includes a thermal imaging detector 51 and a mounting plate 52. The mounting plate 52 is fixedly connected to the outside of the upper fan 21, and the thermal imaging detector 51 is fixedly connected to the mounting plate 52.

[0066] The thermal imaging detectors 51 at various locations are activated. The hot-rolled air-cooled housing 12 has rectangular slots corresponding to the thermal imaging detectors 51. The thermal imaging detectors 51 detect the formed hot-rolled wire rods transported on the conveyor rollers 14. The thermal imaging detectors 51 use infrared detectors to receive the infrared rays radiated outward from the formed hot-rolled wire rods and convert them into electrical signals representing temperature levels. Finally, they are processed into a visible thermal map, which reveals the heat distribution of the stacked hot-rolled wire rods. By observing the amount of heat distribution, the distribution of overlapping and non-overlapping points of the hot-rolled wire rods can be indirectly determined, as well as the distribution area of ​​the hot-rolled wire rods on the conveyor rollers 14.

[0067] The second air-cooled component 3 includes a second fan 31 and a second metal hose 32. The second fan 31 is fixedly installed on the hot-rolled air-cooled housing 12 and the second metal hose 32 is fixedly connected to the air outlet of the second fan 31.

[0068] Metal flexible hose 122 is connected to duct fitting 1433, and metal flexible hose 232 is connected to duct fitting 2434.

[0069] Furthermore, the rotating assembly 42 includes a second motor 421, a rotating shaft 422, and a rotating plate 423. The second motor 421 is fixedly connected to a support plate 41 on one side. The output end of the second motor 421 is fixedly connected to the rotating shaft 422. The other end of the rotating shaft 422 is fixedly connected to the rotating plate 423. The other end of the rotating plate 423 is rotatably connected to the support plate 41 on the other side through a rotating rod.

[0070] Furthermore, the air duct 43 includes a fixed block 431 and a sliding block 432. The fixed block 431 is fixedly connected to the center of the rotating plate 423. A first air duct component 433 is fixedly connected to one side of the fixed block 431. The sliding block 432 is slidably connected to the inner side of the rotating plate 423. The sliding block 432 is symmetrically arranged about the fixed block 431. A second air duct component 434 is fixedly connected to one side of the sliding block 432.

[0071] Furthermore, the moving component 44 includes a push cylinder 441, a push rod 442, a cover plate 443, and a connecting cylinder 444. The connecting cylinder 444 is fixedly connected to the lower part of the side of the second duct component 434 away from the first duct component 433. The push rod 442 is installed on the inner side of the connecting cylinder 444. The cover plate 443 is installed on the connecting cylinder 444 and is used to limit the push rod 442. The push cylinder 441 is fixedly connected to the rotating plate 423. The output end of the push cylinder 441 is fixedly connected to the push rod 442.

[0072] The start-up cylinder 441 pushes the push rod 442, which in turn drives the two air duct components 434 on both sides to move inward or outward under the guidance of the sliding block 432 through the connecting cylinder 444. This allows the air duct components 434 to move precisely to the hot-rolled wire rod overlap area, thereby achieving dynamic air cooling of each area of ​​the hot-rolled wire rod.

[0073] Simultaneously, motor 421 is started, which drives shaft 422 to rotate. Shaft 422 drives rotating plate 423 to rotate, thereby causing duct 433 and duct 434 to rotate back and forth synchronously, making the air oscillate back and forth and improving the air cooling effect.

[0074] It achieves uniform cooling of hot-rolled wire rods and can monitor the temperature drop and rate of temperature drop of hot-rolled wire rods in real time.

[0075] Furthermore, both duct component 1 433 and duct component 2 434 include an air guide assembly 6. The air guide assembly 6 includes an air guide duct 61, a mounting ring 1 62, a mounting groove 63, and a mounting ring 2 64. The air guide duct 61 has a mounting groove 63. The mounting ring 1 62 and the mounting groove 63 are provided on the outside of the mounting groove 63. The mounting ring 1 62 and the mounting groove 63 are fixed to the air guide duct 61 by screws. The mounting ring 2 64 at duct component 1 433 is fixedly connected to the fixing block 431. The mounting ring 2 64 at duct component 2 434 is fixedly connected to the sliding block 432.

[0076] Start the fans 1 21 and 2 31 at each location. The air generated by the fans 1 21 and 2 31 passes through their corresponding metal hoses 1 22 and 2 32 and enters the air duct 1 433 and air duct 2 434. Then the air is blown out through the air guide 61, thereby achieving air cooling of the hot rolled wire rod on the conveyor roller 14.

[0077] Based on the distribution of overlapping and non-overlapping points of hot-rolled wire rod and the distribution of hot-rolled wire rod on conveyor roller 14, the power of fan 1 21 and fan 2 31 is controlled to achieve a smaller air force at duct 1 433, corresponding to the non-overlapping area of ​​hot-rolled wire rod, and a larger air force at duct 2 434, corresponding to the overlapping area of ​​hot-rolled wire rod.

[0078] The hot-rolled air-cooled housing 12 has movable slots corresponding to the first air duct component 433, the second air duct component 434, and the rotating assembly 42, and also has heat dissipation grooves corresponding to the first air duct component 433 and the second air duct component 434.

[0079] A hot rolling process for hot-rolled wire rod includes the following steps:

[0080] S1. Smelting and continuous casting: Electric furnace smelting, LF refining and billet protection casting process are adopted to obtain continuously cast billets;

[0081] S2. Heating: The continuously cast billet is heated in a heating furnace to a furnace temperature of 1100±10℃;

[0082] S3. Rolling and Cooling: The heated billet is subjected to rough rolling, intermediate rolling and pre-finishing rolling in sequence. Then it is cooled by a high-pressure pre-water cooling device with a pressure of 1.2 MPa. After being guided by the first set of Morgan guide grooves, the temperature of the rolled piece is reduced to 960℃ before entering the finishing mill, which effectively increases the yield tensile strength by 20 MPa.

[0083] S4. Finishing rolling: Rolling is completed in the finishing mill, with the finished product rolled out from the 26th stand. The finishing rolling temperature does not exceed 1100℃.

[0084] S5. Wire drawing and air cooling: After finishing rolling, the hot-rolled wire rod is drawn after the wire drawing temperature is controlled by water cooling. The hot-rolled wire rod is cooled in the conveying mechanism 1 and dynamically air-cooled by the air cooling component 1 2, the air cooling component 2 3, the control mechanism 4, and the detection component 5.

[0085] Furthermore, the chemical composition of the continuously cast square billet obtained in S1, by mass percentage, is as follows:

[0086] C: 0.24-0.25%, Si: 0.33-0.41%, Mn: 0.85-0.93%, P: ≤0.045%, S: ≤0.045%,

[0087] The carbon equivalent (Ceq) is 0.38-0.44%.

[0088] The specific usage and function of this embodiment are as follows:

[0089] After smelting in a 105t electric furnace, refining in LF, billet protection casting, billet heating, roughing, intermediate rolling, pre-finishing, pre-water cooling, finishing mill, water cooling, and wire drawing, the formed Φ12mm hot-rolled wire rod is fed onto the conveyor roller 14. The motor 13 is started, which drives the gear 16 to rotate. The gear 16 meshes with and drives the gear 17 to rotate. The gear 17 drives a set of conveyor rollers 14 that are fixedly connected to it to rotate. While the conveyor rollers 14 are rotating, they also drive the sprocket 18 that is fixedly connected to them to rotate. Then, the chain 19 drives the conveyor rollers 14 at various points to rotate synchronously, thereby continuously transporting the formed hot-rolled wire rod forward.

[0090] As the formed hot-rolled wire rod is continuously transported forward, thermal imaging detectors 51 are activated at various locations. The hot-rolled air-cooled housing 12 has rectangular slots corresponding to the thermal imaging detectors 51. The thermal imaging detectors 51 detect the formed hot-rolled wire rod transported on the conveyor rollers 14. The thermal imaging detectors 51 use infrared detectors to receive the infrared rays radiated outward from the formed hot-rolled wire rod and convert them into electrical signals representing temperature levels. Finally, they are processed into a visible thermal map, which reveals the heat distribution of the stacked hot-rolled wire rods. By observing the amount of heat distribution, the distribution of overlapping and non-overlapping points of the hot-rolled wire rods can be indirectly determined, as well as the distribution area of ​​the hot-rolled wire rods on the conveyor rollers 14.

[0091] Then, the external system starts the fans 1 21 and 2 31 at various locations. The fans 1 21 and 2 31 generate airflow through their corresponding metal hoses 1 22 and 2 32, and enter the air duct 1 433 and air duct 2 434. The airflow is then blown out through the air guide 61, thereby achieving air cooling of the hot rolled wire rod on the conveyor roller 14.

[0092] Based on the distribution of overlapping and non-overlapping points of hot-rolled wire rod and the distribution of hot-rolled wire rod on conveyor roller 14, the power of fan 1 21 and fan 2 31 is controlled to achieve a smaller air force at duct 1 433, corresponding to the non-overlapping area of ​​hot-rolled wire rod, and a larger air force at duct 2 434, corresponding to the overlapping area of ​​hot-rolled wire rod.

[0093] At the same time, the push cylinder 441 is activated, which pushes the push rod 442 and drives the air duct component 434 on both sides to move inward or outward under the guidance of the sliding block 432 through the connecting cylinder 444. This allows the air duct component 434 to move precisely to the hot-rolled wire rod overlapping area, thereby realizing dynamic air cooling of each area of ​​the hot-rolled wire rod.

[0094] Simultaneously, motor 421 is started, which drives shaft 422 to rotate. Shaft 422 then drives rotating plate 423 to rotate, thereby causing ductwork component 433 and ductwork component 434 to rotate synchronously back and forth, making the airflow oscillate back and forth and improving the air cooling effect.

[0095] It achieves uniform cooling of hot-rolled wire rods and can monitor the temperature drop and rate of temperature drop of hot-rolled wire rods in real time.

[0096] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A hot rolling equipment for hot-rolled wire rod, comprising a conveying mechanism (1), characterized in that: The upper and lower sides of the conveying mechanism (1) are fixedly installed with evenly distributed air-cooled component one (2) and air-cooled component two (3). The air-cooled component two (3) is symmetrically arranged with respect to the air-cooled component one (2) on the upper and lower sides. The conveying mechanism (1) is fixedly connected to a uniformly distributed control mechanism (4), which corresponds to the first air-cooling component (2) and the second air-cooling component (3). A detection component (5) is fixedly installed on the first air-cooling component (2) on the upper side. The control mechanism (4) includes a support plate (41), a rotating component (42), an air duct (43), and a moving component (44). The outer side of the conveying mechanism (1) is fixedly connected to a uniformly distributed support plate (41). The control mechanism (4) is equipped with a rotating component (42). An air duct (43) is provided on the rotating component (42). The air duct (43) includes a second air duct component (434) and a first air duct component (433). The second air duct component (434) is symmetrically arranged about the first air duct component (433). A moving component (44) is connected between the rotating component (42) and the second air duct component (434). The heat distribution of the hot-rolled wire rod conveyed inside the conveying mechanism (1) is detected by the detection component (5). Based on the heat distribution, the hot-rolled wire rod is dynamically cooled by the air-cooling component one (2), the air-cooling component two (3), and the control mechanism (4). The conveying mechanism (1) includes a conveying roller (14); the conveying mechanism (1) includes a hot-rolled air-cooled housing (12). The air-cooled component one (2) and the air-cooled component two (3) are arranged symmetrically about the conveyor roller (14); The air-cooled component 1 (2) includes a fan 1 (21) and a metal hose 1 (22). The hot-rolled air-cooled housing (12) is fixedly installed with evenly distributed fans 1 (21), and the air outlet of the fan 1 (21) is fixedly connected to the metal hose 1 (22). The detection component (5) includes a thermal imaging detector (51) and a mounting plate (52). The mounting plate (52) is fixedly connected to the outer side of the upper fan (21), and the thermal imaging detector (51) is fixedly connected to the mounting plate (52). The second air-cooled component (3) includes a second fan (31) and a second metal hose (32). The second fan (31) is fixedly installed on the hot-rolled air-cooled housing (12), and the second metal hose (32) is fixedly connected to the air outlet of the second fan (31). The first metal hose (22) is connected to the first air duct (433), the second metal hose (32) is connected to the second air duct (434), and the rotating assembly (42) includes a rotating plate (423). The air duct (43) includes a fixed block (431) and a sliding block (432). The fixed block (431) is fixedly connected to the center of the rotating plate (423). A first air duct component (433) is fixedly connected to one side of the fixed block (431). A sliding block (432) is slidably connected to the inner side of the rotating plate (423). The sliding block (432) is symmetrically arranged about the fixed block (431). A second air duct component (434) is fixedly connected to one side of the sliding block (432). Both the first air duct component (433) and the second air duct component (434) include an air guide assembly (6). The air guide assembly (6) includes an air guide pipe (61), a first mounting ring (62), a mounting groove (63), and a second mounting ring (64). The air guide pipe (61) has a mounting groove (63). The first mounting ring (62) and the mounting groove (63) are provided on the outside of the mounting groove (63). The first mounting ring (62) and the mounting groove (63) are fixed to the air guide pipe (61) by screws. The second mounting ring (64) at the first air duct component (433) is fixedly connected to the fixing block (431). The second mounting ring (64) at the second air duct component (434) is fixedly connected to the sliding block (432). The thermal imaging detector (51) detects the formed hot-rolled wire rod transported on the conveyor roller (14). By observing the heat distribution of the hot-rolled wire rod, it can determine the distribution of overlapping and non-overlapping points of the hot-rolled wire rod. It controls the power of the first fan (21) and the second fan (31) to achieve a smaller air force at the first duct (433), corresponding to the non-overlapping area of ​​the hot-rolled wire rod, and a larger air force at the second duct (434), corresponding to the overlapping area of ​​the hot-rolled wire rod.

2. The hot rolling equipment for hot-rolled wire rod according to claim 1, characterized in that: The conveying mechanism (1) includes a body (11), a motor (13), a bearing seat (15), a gear (16), a gear (17), a sprocket (18), and a chain (19). A hot-rolled air-cooled housing (12) is fixedly installed on the outer side of the body (11). The motor (13) is fixedly connected to the inner side of the body (11) via a rectangular block. Evenly distributed conveying rollers (14) are rotatably connected to the inner side of the body (11). Bearing seats (15) are installed at both ends of the conveying rollers (14). The bearing housing (15) is fixedly connected to the inner side of the conveying mechanism (1). The output end of the motor (13) is fixedly connected to the gear (16). The outer side of one end of the conveying roller (14) is fixedly connected to the gear (17). The gear (16) and the gear (17) mesh with each other. The outer side of one end of the conveying roller (14) is fixedly connected to the sprocket (18). The sprockets (18) on adjacent conveying rollers (14) are distributed in a cross pattern. The adjacent sprockets (18) are driven by a chain (19).

3. The hot rolling equipment for hot-rolled wire rod according to claim 2, characterized in that: The rotating assembly (42) includes a second motor (421), a rotating shaft (422), and a rotating plate (423). The second motor (421) is fixedly connected to one side of the support plate (41). The output end of the second motor (421) is fixedly connected to the rotating shaft (422). The other end of the rotating shaft (422) is fixedly connected to the rotating plate (423). The other end of the rotating plate (423) is rotatably connected to the support plate (41) on the other side through a rotating rod.

4. A hot rolling equipment for hot-rolled wire rod according to claim 3, characterized in that: The moving component (44) includes a push cylinder (441), a push rod (442), a cover plate (443), and a connecting cylinder (444). The lower part of the side of the second duct component (434) away from the first duct component (433) is fixedly connected to the connecting cylinder (444). The push rod (442) is installed on the inner side of the connecting cylinder (444). The cover plate (443) is installed on the connecting cylinder (444) and is used to limit the push rod (442). The push cylinder (441) is fixedly connected to the rotating plate (423). The output end of the push cylinder (441) is fixedly connected to the push rod (442).

5. A hot rolling process for hot-rolled wire rod, employing the hot rolling equipment for hot-rolled wire rod as described in any one of claims 1-4, characterized in that: Includes the following steps: S1. Smelting and continuous casting: Electric furnace smelting, LF refining and billet protection casting process are adopted to obtain continuously cast billets; S2. Heating: The continuously cast billet is heated in a heating furnace to a furnace temperature of 1100±10℃; S3. Rolling and Cooling: The heated billet is subjected to rough rolling, intermediate rolling and pre-finishing rolling in sequence. Then it is cooled by a high-pressure pre-water cooling device with a pressure of 1.2 MPa and guided by the first set of Morgan guide grooves to reduce the temperature of the rolled piece to 960°C before entering the finishing mill. S4. Finishing rolling: Rolling is completed in the finishing mill, with the finished product rolled out from the 26th stand. The finishing rolling temperature does not exceed 1100℃. S5. Wire drawing and air cooling: After the finishing rolled piece is cooled by water cooling to control the wire drawing temperature, it is wire drawn. The hot rolled wire is cooled in the conveying mechanism (1). The hot rolled wire is dynamically air cooled by the air cooling component one (2), the air cooling component two (3), the control mechanism (4), and the detection component (5).

6. The hot rolling process for hot-rolled wire rod according to claim 5, characterized in that: The chemical composition of the continuously cast billet obtained in S1, expressed as a percentage by mass, is as follows: C: 0.24-0.25%, Si: 0.33-0.41%, Mn: 0.85-0.93%, P: ≤0.045%, S: ≤0.045%, carbon equivalent Ceq is 0.38-0.44%.

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