Blank conveying method for continuous casting and direct conveying of rolled steel

Abstract

The invention discloses a blank conveying method for continuous casting and direct conveying of rolled steel. The blank conveying method comprises the steps that a blank enters a rolled steel heating furnace along a first conveying path; the blank enters the steel rolling heating furnace along the second conveying path; the blank enters the steel rolling heating furnace along a third conveying path; the blank enters the steel rolling heating furnace along a fourth conveying path. According to the blank conveying method for continuous casting and direct conveying of the rolled steel, energy needed for reheating the blank can be reduced, and the heating time is shortened.

Description

Technical Field

[0001] This invention belongs to the technical field of hot-rolled strip steel production process. Specifically, this invention relates to a billet conveying method for continuous casting and direct feeding of rolled steel. Background Technology

[0002] The high-speed wire rod and large coil composite production line of Maanshan Iron & Steel Co., Ltd. Special Steel Co., Ltd. was completed and put into operation in 2023. Wire rod and large coil are produced separately. The products are 400,000 tons of Φ5.5~25mm wire rod and 200,000 tons of Φ16~50mm large coil, with a total designed annual output of 600,000 tons. Steel grades produced include: cold heading steel, spring steel, bearing steel, steel cord / cutting wire, steel wire rope / prestressed steel strand / bridge cable steel, welding wire steel, structural steel, and others. Raw materials: continuous casting billets (square): 160mm×160mm×10-11m, and also capable of using 200mm×200mm×8-10m square billets; continuous casting billets (round): Φ200mm×9-10m, used for large coil production.

[0003] To save on heating costs in steel rolling, the design is as follows: Qualified hot-charged billets from the continuous casting outlet are lifted by the hot-charge rollers and vertical elevator to the furnace feed rollers on the +5.30m platform and then fed into the heating furnace. During transport by the furnace feed rollers, the billets are weighed, their shape measured, and material identified. Non-hot-charged billets from continuous casting are unloaded and cooled via the unloading platform, then hoisted onto the loading platform by a magnetic crane before entering the heating furnace.

[0004] The existing method involves feeding and cooling steel billets at the continuous casting unloading platform, then transporting them to the rolling line by truck, flatbed truck, or train, where the billets are heated from a cold state to the rolling temperature. This method wastes a significant amount of energy and requires more space and manpower.

[0005] Chinese Patent Application No. 201710512233.3 discloses a casting-rolling connection method for the conveying process of directly rolled rectangular billets, belonging to the field of long profile direct rolling technology. It relates to the entire process of conveying and connecting high-temperature continuous casting billets from the continuous casting machine after cutting and paralleling to the rolling mill, realizing the turning conveying from the continuous casting machine to the rolling line. It includes a fast-moving straight inclined roller conveyor, an arc-shaped lifting roller conveyor, a uniform-speed direct conveyor, an induction heating device at the end of the direct conveyor, and heat insulation covers above the arc-shaped lifting roller conveyor and the uniform-speed direct conveyor. A temperature measuring alarm device and a steel-separating guide plate are installed at the entrance of the fast roller conveyor. When the temperature meets the direct rolling process range, the billets pass smoothly through the fast roller conveyor for rolling production; otherwise, the fast roller conveyor system alarms, and billets that do not meet the process requirements are removed from the line. The advantages are that it solves the problems of the long distance between the continuous casting machine and the rolling mill and the spatial orientation difference, improves the production efficiency of the direct rolling process, greatly shortens the time for the billet to be transported from the continuous casting machine to the rolling mill, and meets the production requirements of the direct rolling process.

[0006] The aim is to provide an improved billet conveying method for continuous casting and direct feeding of steel rolling, particularly a technical solution for reducing the energy required for billet reheating and shortening the heating time. Summary of the Invention

[0007] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention provides a billet conveying method for continuous casting and direct feeding of rolled steel, with the aim of reducing the energy required for billet reheating.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is: a billet conveying method for continuous casting and direct delivery of steel rolling, comprising:

[0009] The billet enters the steel rolling heating furnace along the first conveying path;

[0010] The billet enters the rolling mill heating furnace along the second conveying path;

[0011] The billet enters the steel rolling heating furnace along the third conveying path;

[0012] The billet enters the steel rolling heating furnace along the fourth conveying path.

[0013] The first conveying path is provided with a first hot conveying roller group, a second hot conveying roller group, a third hot conveying roller group, a fourth hot conveying roller group and a fifth hot conveying roller group. The billet enters the steel rolling heating furnace through the first hot conveying roller group, the second hot conveying roller group, the third hot conveying roller group, the fourth hot conveying roller group and the fifth hot conveying roller group.

[0014] On the first conveying path, the billet is conveyed to the buffer platform by the sixth steel feeder 0, and then moved to the vertical elevator by the second steel transfer device. The billet is then conveyed from the first platform to the second platform by the vertical elevator. The third steel transfer device moves the billet from the vertical elevator to the first furnace entry roller group, and then moves the billet to the fourth furnace entry roller group via the second and third furnace entry roller groups. The billet is then flipped on the fourth furnace entry roller group by the steel turning device, and finally weighed by the weighing device on the fifth furnace entry roller group before entering the steel rolling heating furnace.

[0015] The second conveying path is equipped with a second steel feeder, a third steel feeder, a fifth steel feeder, a sixth steel feeder, a buffer platform, a first hot billet buffer platform, and a second hot billet buffer platform. The billet passes through the first hot conveying roller group, the first hot billet buffer platform, the second hot billet buffer platform, and the fifth hot conveying roller group before entering the buffer platform.

[0016] On the second conveying path, the second steel transfer device moves the billet to the vertical elevator, and the billet is conveyed from the first platform to the second platform by the vertical elevator; the third steel transfer device moves the billet from the vertical elevator to the first furnace entry roller group, and then the billet is moved to the fourth furnace entry roller group via the second furnace entry roller group and the third furnace entry roller group. The billet is then flipped on the fourth furnace entry roller group by the steel turning device, and finally the billet is weighed by the weighing device on the fifth furnace entry roller group before entering the steel rolling heating furnace.

[0017] The third conveying path includes a first steel feeder, a first hot billet unloading platform, a first row of steel chains, a first cold billet loading platform, and a buffer platform. The billet passes through the first hot conveying roller group, the first hot billet unloading platform, the first row of steel chains, the first cold billet loading platform, the third hot conveying roller group, the fourth hot conveying roller group, and the fifth hot conveying roller group before entering the buffer platform.

[0018] The billet is centered on the first hot billet centering device on the first hot conveying roll group. The first steel drawing machine conveys the billet to the first hot billet unloading platform, which then conveys the billet to the first row of steel chains for unloading. The billet is then loaded onto the first cold billet loading platform, and the second steel transfer device moves the billet to the third hot conveying roll group. The billet then moves through the fourth hot conveying roll group to the fifth hot conveying roll group, where the third hot billet centering device centers the billet on the fifth hot conveying roll group. The billet is centered; then the sixth steel feeder transports the billet to the buffer platform, and the second steel transfer device moves the billet to the vertical elevator. The billet is then transported from the first platform to the second platform by the vertical elevator. The third steel transfer device moves the billet from the vertical elevator to the first furnace entry roller group, and then the billet is moved through the second and third furnace entry roller groups to the fourth furnace entry roller group. The billet is then flipped on the fourth furnace entry roller group by the steel turning device, and finally weighed by the weighing device on the fifth furnace entry roller group before entering the rolling mill heating furnace.

[0019] The fourth conveying path includes a fourth steel feeder, a first hot billet buffer stand, a second hot billet unloading stand, a second row of steel chains, a second cold billet loading stand, and a buffer stand. The billet passes through the first hot conveying roller group, the first hot billet buffer stand, the second hot billet unloading stand, the second row of steel chains, the second cold billet loading stand, the second furnace entry roller group, the third furnace entry roller group, the fourth furnace entry roller group, and the fifth furnace entry roller group before entering the steel rolling heating furnace.

[0020] The billet passes through the first hot billet buffer platform to the first connecting roller group, then through the second and third connecting roller groups to the fourth connecting roller group. The fourth steel feeder transports the billet to the second hot billet unloading platform, which then transports it to the second row of steel chains for unloading. The billet is then loaded onto the second cold billet loading platform, and the fourth steel transfer device moves it to the second furnace entry roller group. The billet then passes through the third furnace entry roller group to the fourth furnace entry roller group, where a steel turning device flips it over. Finally, the billet is weighed by a weighing device at the fifth furnace entry roller group before entering the rolling mill heating furnace.

[0021] The billet conveying method for continuous casting and direct delivery of steel rolling of the present invention can reduce the energy required for billet reheating and shorten the heating time. Attached Figure Description

[0022] This manual includes the following figures, which illustrate the following:

[0023] Figure 1 This is a schematic diagram of the billet flow on the first platform;

[0024] Figure 2 This is the equipment layout diagram for the first platform;

[0025] Figure 3 This is a sectional view (AA) of the equipment layout diagram for the first platform.

[0026] Figure 4 This is a sectional view of the equipment layout diagram BB for the first platform;

[0027] Figure 5 This is a schematic diagram of the billet flow direction on the second platform;

[0028] Figure 6 This is the equipment layout diagram for the second platform;

[0029] The diagram is labeled as follows: 1. First row of steel chains; 2. First hot billet unloading platform; 3. First steel drawing machine; 4. First hot conveying roller group; 5. First hot billet centering device; 6. First hot billet buffer platform; 7. First connecting roller group; 8. Second connecting roller group; 9. Third connecting roller group; 10. Fourth connecting roller group; 11. Second hot billet centering device; 12. Second hot billet unloading platform; 13. Second row of steel chains; 14. Fourth steel drawing machine; 15. Third steel drawing machine; 16. Second hot billet buffer platform; 17. Third hot billet centering device; 18. Fifth hot conveying roller group; 19. Fifth steel drawing machine; 20. Sixth steel drawing machine; 21. Buffer platform; 2 2. Second steel transfer device; 23. Vertical elevator; 24. Fourth hot conveying roller group; 25. Third hot conveying roller group; 26. First steel transfer device; 27. Second hot conveying roller group; 28. Second steel transfer machine; 29. ​​Movable baffle; 30. First cold billet loading platform; 31. First furnace entry roller group; 32. Third steel transfer device; 33. Second cold billet loading platform; 34. Fourth steel transfer device; 35. Second furnace entry roller group; 36. Third furnace entry roller group; 37. Steel turning device; 38. Fourth furnace entry roller group; 39. Video recognition system; 40. Weighing device; 41. Fifth furnace entry roller group; 42. Steel rolling heating furnace; 43. Vertical elevator chain. Detailed Implementation

[0030] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention, and to facilitate its implementation.

[0031] It should be noted that in the following embodiments, the terms "first", "second", "third", "fourth", "fifth" and "sixth" do not represent an absolute distinction in structure and / or function, nor do they represent the order of execution, but are merely for the convenience of description.

[0032] This invention provides a method for conveying billets in continuous casting and direct feeding into rolled steel, comprising:

[0033] The billet enters the steel rolling heating furnace along the first conveying path;

[0034] The billet enters the rolling mill heating furnace along the second conveying path;

[0035] The billet enters the steel rolling heating furnace along the third conveying path;

[0036] The billet enters the steel rolling heating furnace along the fourth conveying path.

[0037] The first conveying path is provided with a first hot conveying roller group, a second hot conveying roller group, a third hot conveying roller group, a fourth hot conveying roller group and a fifth hot conveying roller group. The billet enters the steel rolling heating furnace through the first hot conveying roller group, the second hot conveying roller group, the third hot conveying roller group, the fourth hot conveying roller group and the fifth hot conveying roller group.

[0038] On the first conveying path, the billet is conveyed to the buffer platform by the sixth steel feeder 0, and then moved to the vertical elevator by the second steel transfer device. The billet is then conveyed from the first platform to the second platform by the vertical elevator. The third steel transfer device moves the billet from the vertical elevator to the first furnace entry roller group, and then moves the billet to the fourth furnace entry roller group via the second and third furnace entry roller groups. The billet is then flipped on the fourth furnace entry roller group by the steel turning device, and finally weighed by the weighing device on the fifth furnace entry roller group before entering the steel rolling heating furnace.

[0039] The second conveying path is equipped with a second steel feeder, a third steel feeder, a fifth steel feeder, a sixth steel feeder, a buffer platform, a first hot billet buffer platform, and a second hot billet buffer platform. The billet passes through the first hot conveying roller group, the first hot billet buffer platform, the second hot billet buffer platform, and the fifth hot conveying roller group before entering the buffer platform.

[0040] On the second conveying path, the second steel transfer device moves the billet to the vertical elevator. The billet is then transported from the first platform to the second platform, which has a height of 0 meters and a height of 5.3 meters. The third steel transfer device moves the billet from the vertical elevator to the first furnace entry roller group. The billet then passes through the second and third furnace entry roller groups to the fourth furnace entry roller group. The billet is then flipped on the fourth furnace entry roller group by the steel turning device. Finally, the billet is weighed by the weighing device on the fifth furnace entry roller group and then enters the steel rolling heating furnace.

[0041] The third conveying path includes a first steel feeder, a first hot billet unloading platform, a first row of steel chains, a first cold billet loading platform, and a buffer platform. The billet passes through the first hot conveying roller group, the first hot billet unloading platform, the first row of steel chains, the first cold billet loading platform, the third hot conveying roller group, the fourth hot conveying roller group, and the fifth hot conveying roller group before entering the buffer platform.

[0042] The billet is centered on the first hot billet centering device on the first hot conveying roll group. The first steel drawing machine conveys the billet to the first hot billet unloading platform, which then conveys the billet to the first row of steel chains for unloading. The billet is then loaded onto the first cold billet loading platform, and the second steel transfer device moves the billet to the third hot conveying roll group. The billet then moves through the fourth hot conveying roll group to the fifth hot conveying roll group, where the third hot billet centering device centers the billet on the fifth hot conveying roll group. The billet is centered; then the sixth steel feeder transports the billet to the buffer platform, and the second steel transfer device moves the billet to the vertical elevator. The billet is then transported from the first platform to the second platform by the vertical elevator. The third steel transfer device moves the billet from the vertical elevator to the first furnace entry roller group, and then the billet is moved through the second and third furnace entry roller groups to the fourth furnace entry roller group. The billet is then flipped on the fourth furnace entry roller group by the steel turning device, and finally weighed by the weighing device on the fifth furnace entry roller group before entering the rolling mill heating furnace.

[0043] The fourth conveying path includes a fourth steel feeder, a first hot billet buffer stand, a second hot billet unloading stand, a second row of steel chains, a second cold billet loading stand, and a buffer stand. The billet passes through the first hot conveying roller group, the first hot billet buffer stand, the second hot billet unloading stand, the second row of steel chains, the second cold billet loading stand, the second furnace entry roller group, the third furnace entry roller group, the fourth furnace entry roller group, and the fifth furnace entry roller group before entering the steel rolling heating furnace.

[0044] The billet passes through the first hot billet buffer platform to the first connecting roller group, then through the second and third connecting roller groups to the fourth connecting roller group. The fourth steel feeder transports the billet to the second hot billet unloading platform, which then transports it to the second row of steel chains for unloading. The billet is then loaded onto the second cold billet loading platform, and the fourth steel transfer device moves it to the second furnace entry roller group. The billet then passes through the third furnace entry roller group to the fourth furnace entry roller group, where a steel turning device flips it over. Finally, the billet is weighed by a weighing device at the fifth furnace entry roller group before entering the rolling mill heating furnace.

[0045] Example

[0046] This embodiment provides a method for conveying billets from continuous casting to the rolling mill. This method divides the billets from continuous casting into the rolling mill's heating furnace via four paths. The billets are conveyed directly and quickly into the heating furnace via the first conveying path. The billets are then conveyed along the second conveying path, passing through the first hot billet buffer stand 6 and the second hot billet buffer stand 16 before being conveyed back into the rolling mill. Excess billets are cooled and then fed into the heating furnace via the third conveying path, where they are cooled in the first raw material bay before being reloaded into the rolling mill. Finally, the billets are conveyed along the fourth conveying path, where they are cooled in the second raw material bay before being reloaded into the rolling mill. This method saves a significant amount of energy required for billet reheating and shortens the heating time.

[0047] In this embodiment, to save energy, the high-temperature red billets from continuous casting are fed into the rolling mill heating furnace at their highest possible temperature. Billets not currently in production are also unloaded from continuous casting and only added when production is required. Of the red billets fed into the rolling mill, 50% (300,000 tons) are fed at their highest temperature. The temperature of the red billets upon entering the furnace is approximately 600 degrees Celsius. The energy saved is from heating 300,000 tons of billets from room temperature (20 degrees Celsius) to 600 degrees Celsius. During the heating process, the efficiency of transferring the combustion gas mixture to the billets is approximately 0.6.

[0048] The amount of heat required to heat 300,000 tons of billet annually from 20℃ to 600℃ is: Q = 30 * 10⁷ kg * 600 - 20℃ * 0.461 kJ / kg·℃ = 8.004 ... 11 kj. Gas required for heating billets: The price of mixed gas from Maanshan Iron & Steel is approximately 0.348 yuan / Nm³. 3 The calorific value of the gas is 2200 * 4.18 kJ / Nm³. 3 Energy saving benefit = 8.004*1011 / 2200 / 4.18 / 0.6*0.348 = 5.07*107 yuan = 50.7 million yuan / year.

[0049] Specifically, such as Figures 1 to 6 As shown, two billets are delivered from the continuous casting hot feed line. The first, second, third, and fourth steel transfer devices can only transfer one billet at a time. That is, the number of hot feed billets moving from the first cold billet loading platform 30 to the third hot feed roller group 25 each time is one, and the number of hot feed billets moving from the second cold billet loading platform 33 to the second furnace entry roller group 35 is also one. The two billets from the continuous casting line are conveyed together all the way to the fifth hot feed roller table 25 and the buffer platform 21. The second steel transfer device separates the steel, conveying one billet at a time to the vertical elevator 23, and then to the first furnace entry roller table 31, where one billet enters the rolling mill heating furnace at a time.

[0050] Hot conveying roller assembly: such as Figure 2As shown, the welded hollow roller has a diameter of 400mm. The roller shape is suitable for conveying square and round billets. It is a flat roller with a flange, water-cooled bearing housing, and driven by a variable frequency gear motor. It is controlled in 5 groups: the first hot-feeding roller group (4), the second hot-feeding roller group (27), the third hot-feeding roller group (25), the fourth hot-feeding roller group (24), and the fifth hot-feeding roller group (18). The motor power of the hot-feeding roller group is 5.5KW, the reduction ratio of the reducer is i = 34.47, and the rated speed of the roller group is 0.89m / s. The roller group control includes start, acceleration, deceleration, and stop. Material detection elements between roller groups detect hot and cold metals. The roller spacing is 1500mm, and automatic centralized dry oil lubrication is provided. The hot-feeding roller group functions to transport hot billets from continuous casting to: the first hot billet unloading platform (2), the first hot billet buffer platform (6), and the vertical elevator (23). It also transports cold billets from the first cold billet loading platform (30) to the vertical elevator (23).

[0051] Hot billet centering device: such as Figure 2 As shown, three hot billet centering devices are provided, each with six individual swing mechanisms arranged in three groups on both sides of the rollers. The swing mechanism consists of a swing frame with rollers and a hydraulic cylinder (model 63 / 45-190). The hydraulic cylinder pushes the frame to swing around a fixed axis. The function of the hot billet centering device is as follows: when the billet stops on this section of the roller group and a billet is detected, the hydraulic cylinder pushes the machine forward, pushing the billet from both sides towards the center of the roller group to align the billet, and then quickly retreats to the offline position. The three hot billet centering devices are the first hot billet centering device 5, the second hot billet centering device 11, and the third hot billet centering device 17. The first hot billet centering device 5 is located on both sides of the first hot delivery roller group 4, bringing the two billets on the first hot delivery roller group 4 together and placing them at the center of the roller surface. The second hot billet centering device 11 is located on both sides of the fourth connecting roller group 10. The second hot billet centering device 11 brings the two billets on the fourth connecting roller group 10 together and places them at the center of the roller surface. The third hot billet centering device 17 is located on both sides of the fifth hot conveying roller group 18. The third hot billet centering device 17 brings the two billets on the fifth hot conveying roller group 18 together and places them at the center of the roller surface.

[0052] Steel drawing machine: such as Figure 2As shown, a total of 6 steel-pulling machines are installed: the first steel-pulling machine (3), the second steel-pulling machine (28), the third steel-pulling machine (14), the fourth steel-pulling machine (15), the fifth steel-pulling machine (19), and the sixth steel-pulling machine (20). The steel-pulling machine is a rotary unloading mechanism. It has a welded steel structure base; the structure uses a variable frequency motor to drive a long shaft to achieve rotary motion; a gear synchronization mechanism ensures that the picking and unloading forks of the steel-pulling machine remain vertically upward during rotary motion; the bearing seats are centrally lubricated with dry oil. One variable frequency motor with a power of 45KW is installed for each steel-pulling machine. The variable frequency motor is connected to a reducer with a reduction ratio of i = 140. The turning radius of the steel-pulling machine is R = 1190mm. An encoder is installed to detect the position of the forks, a proximity switch is installed to detect the 0° position and stop the equipment at the 0° position, and a brake is installed to be used when the motor stops. Steel-drawing machine functions: When the steel-drawing machine is stopped at 0°, the variable frequency motor drives the equipment to rotate, enabling it to receive billets at 90° and release them at 270°. The 0° stop position ensures that the fork is away from the hot billet, reducing damage to the fork from iron oxide scale. Before receiving the billet at -90°, the speed is reduced to gently handle it, reducing equipment impact; after receiving, the speed is rapidly increased, reducing cycle time. Before releasing the billet at -270°, the speed is reduced to gently release it, reducing equipment impact; after releasing, the machine quickly leaves the release position, reducing interference with subsequent operations and reducing cycle time.

[0053] In one cycle, the billet feeder moves the billet to a designated position: the first feeder 3 feeds the billet from the first hot conveying roller group 4 to the first hot billet unloading platform 2; the second feeder 28 feeds the billet from the first hot conveying roller group 4 to the first hot billet buffer platform 6; the third feeder 14 feeds the billet from the fourth connecting roller group 10 to the second hot billet unloading platform 12; the fourth feeder 15 feeds the billet from the fourth connecting roller group 10 to the first hot billet buffer platform 6; the fifth feeder 19 feeds the billet from the second hot billet buffer platform 16 to the fifth hot conveying roller group 18; and the sixth feeder 20 feeds the billet from the fifth hot conveying roller group 18 to the storage platform.

[0054] Connecting roller group: such as Figure 2 As shown, the connecting roller group consists of welded hollow rollers with a diameter of 400mm; the roller shape is suitable for conveying square and round billets and consists of rimmed flat rollers; an elastic coupling; a variable frequency gear motor for each roller with independent drive; water-cooled bearing housings; the motor power of the connecting roller group is 5.5KW, the motor is connected to a reducer with a reduction ratio i = 34.47, and automatic centralized dry lubrication is provided. The connecting roller group has 33 rollers controlled in 4 groups: the first connecting roller group (7), the second connecting roller group (8), the third connecting roller group (9), and the fourth connecting roller group (10); automatic control of roller group start, acceleration, deceleration, and stop; material detection elements between roller groups are hot and cold metal detectors; the rated speed of the roller group is 0.89m / s. The function of the connecting roller group is to receive hot billets from the first buffer platform and convey the billets to the third and fourth steel feeders (14 and 15).

[0055] Steel chain: such as Figure 2 As shown, the system consists of a first row of steel chains (1) and a second row of steel chains (13). The steel chains are welded steel structures with sprockets and chains. Each steel chain is driven by a 22kW variable frequency motor connected to a reducer with a reduction ratio of i=180. The drive sprocket diameter is φ522.62mm, and the maximum set chain linear speed is 0.23m / s to prevent the round steel from rolling during acceleration. An encoder inside the motor detects the chain drive distance. A built-in brake in the variable frequency motor stops the motor. A laser rangefinder is located at the tail of the steel chains; when a billet is detected, the variable frequency motor is prevented from starting to prevent the billet from being ejected from the chain. Position and function: The first row of steel chains (1) is located at the end of the first hot billet unloading platform (2); the second row of steel chains (13) is located at the end of the second hot billet unloading platform (12). The steel chain is used to arrange the billets from the first hot billet unloading platform 2 and the second hot billet unloading platform 12 according to the number required by the crane. Depending on the crane's capacity, round steel is arranged in 4-6 pieces, and square steel is arranged in 4-6 pieces. Then, the overhead crane is used to lift the arranged billets to the storage area.

[0056] Steel-moving device: such as Figure 1 and Figure 5 As shown, it is divided into a first steel-moving device 26, a second steel-moving device 22, a third steel-moving device 32, and a fourth steel-moving device 34. Structure: A welded steel structure base and a material-supporting arm. Each steel-moving device has four identical independent lifting hydraulic cylinders (Ф80 / Ф56-200) to drive the lifting of the material-supporting arm, and lateral hydraulic cylinders (Ф80 / Ф56-830) to drive the lateral movement of the material-supporting arm. One synchronous double-solenoid valve drives four lateral hydraulic cylinders via a synchronous motor to achieve synchronous forward / backward and upward / downward movement; one proximity switch detects the backward limit position; and one proximity switch detects the forward limit position. Position and function: The first steel-moving device 26 is located on the side of the third hot-feeding roller group 25. The first steel-moving device 26 picks up one billet from the first cold billet loading platform 30 and transfers it to the third hot-feeding roller group 25. The second steel transfer device 22 is located on the side of the vertical elevator 23. The second steel transfer device 22 picks up a billet from the buffer platform to the vertical elevator 23. The third steel transfer device 32 is located on the side of the first furnace feed roller group 31. The third steel transfer device 32 picks up a billet from the vertical elevator 23 to the first furnace feed roller group 31. The fourth steel transfer device 34 is located on the side of the second furnace feed roller group 35. The fourth steel transfer device 34 picks up a billet from the second cold billet loading platform 33 to the second furnace feed roller group 35.

[0057] Vertical lifting machine 23: such as Figure 5As shown, a welded steel structure support is provided; the vertical lifting machine 23 includes a sprocket and chain conveying mechanism; one variable frequency motor drives the vertical lifting chain (37KW), and one motor has a built-in encoder to measure the lifting distance of the vertical lifting chain. It rotates in one direction, and each chain has two material hooks arranged symmetrically at 180 degrees. One reducer (i=80) and one brake engage when the motor stops; the drive sprocket diameter is φ653.28, and the maximum linear speed of the chain is 0.42m / s. The deceleration before receiving material reduces the impact of the billet on the equipment; one proximity switch detects the material hook encoder being zeroed, and the proximity switch assists the encoder in positioning the material hook; one laser rangefinder detects whether there is a billet at the receiving position, and one laser rangefinder detects whether there is a billet at the highest position. Location and Function: On the sides of the fifth hot conveying roller group 18 and the first furnace feed roller group 31, the second steel transfer device 22 on the first platform transfers the billet to the material hook on the chain of the vertical elevator 23. After the laser rangefinder detects that there is material at this position, it starts the vertical elevator chain to lift the billet from the first platform to the second platform. The billet is then transferred to the first furnace feed roller group 31 by the third steel transfer device 32.

[0058] Stand: such as Figure 1 As shown, it is divided into a first hot billet unloading platform 2, a second hot billet unloading platform 12, a first hot billet buffer platform 6, a second hot billet buffer platform 16, and a first cold billet loading platform 30, etc. Figure 5The second cold billet loading platform 33 is shown. The first hot billet unloading platform 2, the second hot billet unloading platform 12, the first hot billet buffer platform 6, the second hot billet buffer platform 16, and the first cold billet loading platform 30 are all located on the ±0m plane and have the same structural form. These five platforms are located on the side of the hot conveying roller group or connecting roller group, and all are welded steel structures. Two lateral hydraulic cylinders with linear displacement sensors drive the platform's lateral movement; four lifting hydraulic cylinders drive the platform's lifting; automatic dry oil lubrication; lifting is controlled by one proportional solenoid valve through one synchronous motor, controlling the lifting of the four hydraulic cylinders, with proximity switches detecting the upper and lower positions; two proportional valves control the lateral movement of two hydraulic cylinders respectively, with linear displacement sensors detecting the position. The first hot billet unloading platform 2 and the second hot billet unloading platform 12 can store a maximum of 20 billets, the first hot billet buffer platform 6 and the second hot billet buffer platform 16 can store a maximum of 20 billets, and the first cold billet loading platform 30 can store a maximum of 25 billets. Location and Function: The first hot billet unloading platform 2 is located on the side of the first hot conveying roller group 4 in the raw material 1 span. It turns and conveys the billet picked up from the first hot conveying roller group 4 by the first steel turning machine 3 to the first row of steel chains 1 in front of the platform, and then lifts it to the storage area by a crane; the second hot billet unloading platform 12 is located in the raw material 2 span. It turns and conveys the billet picked up from the fourth connecting roller group 10 by the third steel turning machine 14 to the second row of steel chains 13 in front of the platform, and then lifts it to the storage area by a crane; the first hot billet The buffer platform 6 is located on the side of the first hot conveying roller group 4 in the raw material 1 span. It turns and steps the billet from the first hot conveying roller group 4, picked up by the second steel feeder 28, onto the first connecting roller group 7 in front of the platform. The second hot billet buffer platform 16 is located on the side of the fourth connecting roller group 10 in the raw material 2 span. It turns and steps the billet from the fourth connecting roller group 10, picked up by the fourth steel feeder 15, onto the fifth steel feeder 19 in front of the platform. The fifth steel feeder 19 then turns the billet onto the fifth hot conveying roller group 18. The first cold billet loading platform 30 is located on the side of the third hot conveying roller group 25 in the raw material 1 span. It steps the billet hoisted to this platform by the overhead crane onto the third hot conveying roller group 25. The second cold billet loading platform 33 is a welded steel structure; one solenoid valve controls two lateral hydraulic cylinders to drive the platform's lateral movement, and one solenoid valve controls two lifting hydraulic cylinders to drive the platform's lifting and lowering. It is automatically lubricated with dry oil.

[0059] Material detection element at the tail of the frame: hot and cold metal detector. Location and function: The second cold billet loading frame 33 is located on the side of the third furnace inlet roller group 6 of the raw material 2 span. The billet hoisted to this frame by the overhead crane is conveyed to the third furnace inlet roller group 6 by stepping. Storage frame 21: The structure is all welded steel structure, with steel rails on the upper side for placing billets; location and function: located on the side of the vertical elevator 23, its function is to store the billets conveyed from the fifth hot delivery roller group 18, providing billets for the vertical elevator 23.

[0060] Movable baffle 29: This is a welded steel structure frame. The movable baffle 29 includes a hydraulic cylinder and a baffle body. The hydraulic cylinder drives the baffle body to rise and fall. The width of the baffle body is 800mm. The hydraulic cylinder is Ф80 / Ф56-500. The movable baffle 29 is located between the second hot conveying roller group 27 and the third hot conveying roller group 25. The function of the movable baffle 29 is to prevent the billet from rushing to the next station and to align the end faces of the two hot conveying billets.

[0061] Furnace roller assembly: such as Figure 5 As shown, the furnace feed roller group consists of welded hollow rollers with a roller specification of Ф320X500. There are 48 roller groups, controlled in 5 groups: the first feed roller group (31), the second feed roller group (35), the third feed roller group (6), the fourth feed roller group (38), and the fifth feed roller group (41). The bearing housings are water-cooled; automatic centralized dry lubrication is used; an elastic coupling is employed; a variable frequency gear motor with a separate transmission speed ratio of 22.62 is used; and two sets of bell-shaped inlets are installed at the furnace inlet. The roller group controls start, acceleration, deceleration, and stop; the material detection elements between roller groups are for detecting hot and cold metals; the function is to receive hot and cold billets from the vertical elevator 23 and cold billets from the second loading platform. The billets are then conveyed to: the steel turning device 37 and the weighing device 40, finally entering the furnace.

[0062] Video recognition system 39: The video recognition system 39 is installed on the top, sides, and end of the fourth feed roller group 38. The video recognition system 39 includes multiple cameras. Three cameras installed on the top of the fourth feed roller group 38 and three cameras installed on the sides of the fourth feed roller group 38 are used for measuring the length and width of the billet and for identifying the curvature and batch number of the billet, respectively. One camera installed at the end of the fourth feed roller group 38 is used to capture the billet number and QR code batch number at the end of the billet.

[0063] Steel-turning device 37: such as Figure 5 As shown, the steel-turning device 37 is a welded steel structure. The steel-turning device 37 includes three transverse hydraulic cylinders with linear displacement sensors, whose forward / reverse positions are controlled by a dual-electromagnetic hydraulic proportional valve with a synchronous motor. The steel-turning device 37 also includes three tilting hydraulic cylinders with linear displacement sensors, whose forward / reverse positions are controlled by a dual-electromagnetic hydraulic proportional valve with a synchronous motor. The steel-turning device 37 is located on the side of the fourth furnace-entry roller group 38. After the billet stops at the fourth furnace-entry roller group 38, when the video recognition system 39 detects that the billet's width, narrowness, or bending direction does not meet the furnace-entry requirements, the three transverse hydraulic cylinders drive the device to move horizontally, and the three tilting hydraulic cylinders drive the device to tilt, turning the billet 90 degrees before it enters the furnace.

[0064] Weighing device 40: such as Figure 5As shown, the weighing device 40 has a welded steel structure support; four hydraulic cylinders (Ф80 / Ф56-300) drive the support to lift and lower; one hydraulic solenoid valve controls the lifting and lowering of the four hydraulic cylinders; and four proximity switches detect the offline position of each of the four hydraulic cylinders. It includes six 5t weighing modules and one secondary instrument. The weighing device 40 is located below the fifth furnace feed roller group 41. After the billet stabilizes on the fifth furnace feed roller group 41, the hydraulic cylinders drive the lifting device to rise, lifting the billet away from the furnace feed roller group. After the billet stabilizes, the weighing sensors installed below the device, in conjunction with the weighing instrument, perform the weighing function. After weighing, the lifting device lowers, placing the billet back onto the fifth furnace feed roller group 41 before it enters the furnace.

[0065] like Figures 1 to 6 As shown in the figure, in this embodiment, the high-temperature billet transported from continuous casting is fed into the steel rolling heating furnace through four paths, as shown below.

[0066] The billet temperature delivered by the continuous casting machine is 850℃. The specific process of the billet entering the steel rolling heating furnace along the first conveying path is as follows:

[0067] The continuously cast billet sequentially passes through the first hot feed roll group 4, the second hot feed roll group 27, the third hot feed roll group 25, and the fourth hot feed roll group 24 before entering the fifth hot feed roll group 18. On the fifth hot feed roll group 18, the billet is centered by the third hot billet centering device 17. Then, the sixth steel transfer machine 20 transports the billet from the fifth hot feed roll group 18 to the buffer platform 21. The second steel transfer device 22 picks up the billet from the buffer platform 21 and places it onto the vertical elevator 23. The vertical elevator 23 then transports the billet from the first platform to the second platform. Finally, the third steel transfer device 32 moves the billet... The billet is lifted from the vertical elevator 23 to the first feed roller group 31, and continues through the second feed roller group 35, the third feed roller group 6, and then into the fourth feed roller group 38. On the fourth feed roller group 38, the video recognition system 39 identifies the batch number, length, width, height, and curvature of the billet. If the video recognition system 39 identifies that the curvature of the billet exceeds the standard, the billet is flipped by the steel-turning device 37 on the fourth feed roller group 38. The flipped billet is then conveyed through the fifth feed roller group 41, weighed by the weighing device 40, and finally enters the heating furnace. If the video recognition system 39 identifies that the curvature of the billet does not exceed the standard, the billet does not need to be flipped and is directly conveyed through the fifth feed roller group 41, weighed by the weighing device 40, and finally enters the rolling mill heating furnace.

[0068] The billet enters the rolling mill heating furnace quickly and directly via the first conveying path. The billet temperature entering the rolling mill heating furnace is 600 degrees Celsius. The billet has minimal heat loss, shortens the reheating time, and reduces energy consumption.

[0069] If the steel rolling furnace cannot accept all the billets immediately, the billets can enter the steel rolling furnace along the second conveying path. The specific process of the billets entering the steel rolling furnace along the second conveying path is as follows:

[0070] If the steel rolling furnace cannot accept all the continuously cast billets at the first time, the billets will be sent directly into the steel rolling furnace after passing through the first hot billet buffer stand and the second hot billet buffer stand.

[0071] When the continuously cast billet passes through the first hot delivery roll group 4, the head of the billet on the first hot delivery roll group 4 is aligned by the movable baffle 29. Then, the first hot billet centering device 5 centers the billet on the first hot delivery roll group 4. Then, the second steel feeder 28 conveys the billet to the first hot billet buffer platform 6. The first hot billet buffer platform 6 conveys the billet to the first connecting roll group 7. Then, the billet is conveyed to the second connecting roll group 8 and the third connecting roll group 9 to the fourth connecting roll group 10. Then, the third steel feeder 14 conveys the billet on the fourth connecting roll group 10 to the second hot billet buffer platform 16. The fifth steel feeder 19 conveys the billet from the second hot billet buffer platform 16 to the fifth hot delivery roll group 18. Finally, the sixth steel feeder 20 conveys the billet from the fifth hot delivery roll group 18 to the buffer platform. The billet on the buffer platform 21 is picked up by the second steel transfer device 22 and transferred to the vertical elevator 23. The vertical elevator 23 then transports the billet from the first platform to the second platform. The third steel transfer device 32 picks up the billet from the vertical elevator 23 and transfers it to the first furnace inlet roller group 31. The billet continues to be transported to the fourth furnace inlet roller group 38 via the second furnace inlet roller group 35 and the third furnace inlet roller group 6. On the fourth furnace inlet roller group 38, the video recognition system 39 identifies the batch number, length, width, height, and curvature of the billet. If the video recognition system 39 identifies that the curvature of the billet exceeds the standard, the steel turning device 37 turns the billet with excessive curvature on the fourth furnace inlet roller group 38. The turned billet is then transported to the fifth furnace inlet roller group 41 and weighed by the weighing device 40. Finally, the billet enters the heating furnace. If the video recognition system 39 identifies that the curvature of the billet does not exceed the standard, the billet does not need to be turned over. The billet is directly conveyed by the fifth furnace roller group 41, weighed by the weighing device 40, and finally enters the heating furnace.

[0072] The specific process by which the billet enters the rolling mill heating furnace along the third conveying path is as follows:

[0073] In the three-stage continuous casting process, the billet is cooled after being fed into the raw material section and then re-fed into the rolling mill heating furnace. When the continuously cast billet passes through the first hot conveyor roller group 4, the head of the billet on the first hot conveyor roller group 4 is aligned by the movable baffle 29. Then, the first hot billet centering device 5 centers the billet on the first hot conveyor roller group 4. The first steel feeder 3 transports the billet to the first hot billet unloading platform 2. The first hot billet unloading platform 2 transports the billet to the first row of steel chains 1. The billet is unloaded by a crane on the first row of steel chains 1. After the billet is cooled, it is reloaded. A crane is used to load the billet onto the first cold billet loading platform 30. Then, the first steel transfer device 26 picks up the billet from the first cold billet loading platform 30 and moves it to the third hot conveying roller group 25. The billet from the third hot conveying roller group 25 is then conveyed to the fifth hot conveying roller group 18 via the fourth hot conveying roller group 24. On the fifth hot conveying roller group 18, the third hot billet centering device 17 centers the billet. Then, the sixth steel conveyor 20 conveys the billet to the buffer platform 21, where the second steel transfer device 22 picks it up and moves it to the vertical elevator 23. The vertical elevator 23 then transports the billet from the first platform... The billet is then sent to the second platform; the third steel transfer device 32 picks it up from the vertical elevator 23 and transfers it to the first furnace entry roller group 31. The billet is then conveyed through the second furnace entry roller group 35 and the third furnace entry roller group 6 to the fourth furnace entry roller group 38. On the fourth furnace entry roller group 38, the video recognition system 39 identifies the billet's batch number, length, width, height, and curvature. If the video recognition system 39 identifies that the billet's curvature exceeds the standard, the steel flipping device 37 flips the billet on the fourth furnace entry roller group 38. The flipped billet is then conveyed through the fifth furnace entry roller group 41, weighed by the weighing device 40, and finally enters the heating furnace. If the video recognition system 39 identifies that the billet's curvature does not exceed the standard, the billet does not need to be flipped; it is directly conveyed through the fifth furnace entry roller group 41, weighed by the weighing device 40, and finally enters the heating furnace.

[0074] The specific process by which the billet enters the rolling mill heating furnace along the fourth conveying path is as follows:

[0075] The billet from the four-stage continuous casting process is cooled after being fed into the second raw material span and then re-fed into the rolling mill heating furnace. When the continuously cast billet passes through the first hot conveyor roll group 4, the head of the billet on the first hot conveyor roll group 4 is aligned by the movable baffle 29. Then, the first hot billet centering device 5 centers the billet on the first hot conveyor roll group 4. Then, the second steel feeder 28 conveys the billet to the first hot billet buffer platform 6. The first hot billet buffer platform 6 conveys the billet to the first connecting roll group 7. The billet continues to be conveyed through the second connecting roll group 8 and the third connecting roll group 9 to the fourth connecting roll group 10. Then, the fourth steel feeder 15 conveys the billet to the second hot billet unloading platform 12. The second hot billet unloading platform 12 conveys the billet to the second row of steel chains 13. The billet is unloaded by a crane on the second row of steel chains 13. After cooling, the billets are reloaded. A crane loads the billets onto the second cold billet loading platform 33, and then the fourth steel transfer device 34 lifts them onto the second furnace inlet roller group 35. The billets are then conveyed via the third furnace inlet roller group 6 to the fourth furnace inlet roller group 38. On the fourth furnace inlet roller group 38, a video recognition system 39 identifies the billet's batch number, length, width, height, and curvature. If the video recognition system 39 determines that the billet's curvature exceeds the standard, the steel flipping device 37 flips the billet on the fourth furnace inlet roller group 38. The flipped billet is then conveyed via the fifth furnace inlet roller group 41, weighed by the weighing device 40, and finally enters the heating furnace. If the video recognition system 39 determines that the billet's curvature does not exceed the standard, the billet does not need to be flipped; it is directly conveyed via the fifth furnace inlet roller group 41, weighed by the weighing device 40, and finally enters the heating furnace.

[0076] The high-speed wire rod and large coil composite production line has an annual output of 600,000 tons. 50% of the red-hot billets from continuous casting are directly fed into the rolling mill's heating furnace, accounting for 300,000 tons. This method saves a significant amount of energy required for billet reheating and shortens the heating time.

[0077] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A billet conveying method for direct delivery of steel from continuous casting to rolling mill, characterized in that, include: The billet enters the steel rolling heating furnace along the first conveying path; The billet enters the rolling mill heating furnace along the second conveying path; The billet enters the steel rolling heating furnace along the third conveying path; The billet enters the steel rolling heating furnace along the fourth conveying path.

2. The billet conveying method for continuous casting and direct delivery of steel rolling mill according to claim 1, characterized in that, The first conveying path is provided with a first hot conveying roller group (4), a second hot conveying roller group (27), a third hot conveying roller group (25), a fourth hot conveying roller group (24) and a fifth hot conveying roller group (18). The billet enters the steel rolling heating furnace through the first hot conveying roller group (4), the second hot conveying roller group (27), the third hot conveying roller group (25), the fourth hot conveying roller group (24) and the fifth hot conveying roller group (18).

3. The billet conveying method for continuous casting and direct delivery of steel rolling mill according to claim 2, characterized in that, On the first conveying path, the billet is conveyed to the buffer platform (21) by the sixth steel feeder (20), and the billet is moved to the vertical elevator (23) by the second steel transfer device (22). The billet is conveyed from the first platform to the second platform by the vertical elevator (23). The third steel transfer device (32) moves the billet from the vertical elevator (23) to the first furnace entry roller group (31). Then the billet is moved to the fourth furnace entry roller group (38) by the second furnace entry roller group (35) and the third furnace entry roller group (36). The billet is then flipped on the fourth furnace entry roller group (38) by the steel turning device (37). Finally, the billet is weighed by the weighing device (40) on the fifth furnace entry roller group (41) and then enters the steel rolling heating furnace.

4. The billet conveying method for continuous casting and direct feeding of steel rolling according to any one of claims 2 to 3, characterized in that, The second conveying path is equipped with a second steel feeder (28), a third steel feeder (14), a fifth steel feeder (19), a sixth steel feeder (20), a buffer platform (21), a first hot billet buffer platform (6), and a second hot billet buffer platform (16). The billet passes through the first hot conveying roller group (4), the first hot billet buffer platform (6), the second hot billet buffer platform (16), and the fifth hot conveying roller group (18) before entering the buffer platform (21).

5. The billet conveying method for continuous casting and direct delivery to rolling mill according to claim 4, characterized in that, On the second conveying path, the billet is moved to the vertical elevator (23) by the second steel transfer device (22), and the billet is conveyed from the first platform to the second platform by the vertical elevator (23); the billet is moved from the vertical elevator (23) to the first furnace roller group (31), and then the billet is moved to the fourth furnace roller group (38) by the second furnace roller group (35) and the third furnace roller group (36). The billet is then flipped on the fourth furnace roller group (38) by the steel turning device (37), and finally weighed by the fifth furnace roller group (41) and the weighing device (40) before entering the steel rolling heating furnace.

6. The billet conveying method for continuous casting and direct feeding of steel rolling according to any one of claims 2 to 5, characterized in that, The third conveying path is provided with a first steel feeder (3), a first hot billet unloading platform (2), a first row of steel chains (1), a first cold billet loading platform (30), and a buffer platform (21). The billet passes through the first hot conveying roller group (4), the first hot billet unloading platform (2), the first row of steel chains (1), the first cold billet loading platform (30), the third hot conveying roller group (25), the fourth hot conveying roller group (24), and the fifth hot conveying roller group (18) before entering the buffer platform (21).

7. The billet conveying method for continuous casting and direct delivery to rolling mill according to claim 6, characterized in that, The billet is centered on the first hot billet centering device (5) on the first hot conveying roller group (4), and the billet is transported to the first hot billet unloading platform (2) by the first steel drawing machine (3). The billet is then transported to the first row of steel chains (1) by the first hot billet unloading platform (2), and then unloaded. The billet is then loaded onto the first cold billet loading platform (30), and the billet is moved to the third hot conveying roller group (25) by the second steel transfer device (22). The billet is then moved to the fifth hot conveying roller group (18) via the fourth hot conveying roller group (24), and centered on the billet by the third hot billet centering device (17) on the fifth hot conveying roller group (18). The billet is transported to the buffer platform (21) by the sixth steel feeder (20), and then moved to the vertical elevator (23) by the second steel transfer device (22). The billet is transported from the first platform to the second platform by the vertical elevator (23). The third steel transfer device (32) moves the billet from the vertical elevator (23) to the first furnace entry roller group (31). Then the billet is moved to the fourth furnace entry roller group (38) by the second furnace entry roller group (35) and the third furnace entry roller group (36). The billet is then flipped on the fourth furnace entry roller group (38) by the steel turning device (37). Finally, the billet is weighed by the weighing device (40) on the fifth furnace entry roller group (41) and then enters the steel rolling heating furnace.

8. The billet conveying method for continuous casting and direct feeding of steel rolling mills according to any one of claims 2 to 7, characterized in that, The fourth conveying path is equipped with a fourth steel feeder (15), a first hot billet buffer stand (6), a second hot billet unloading stand (12), a second row of steel chains (13), a second cold billet loading stand (33), and a buffer stand (21). The billet passes through the first hot conveying roller group (4), the first hot billet buffer stand (6), the second hot billet unloading stand (12), the second row of steel chains (13), the second cold billet loading stand (33), the second furnace entry roller group (35), the third furnace entry roller group (36), the fourth furnace entry roller group (38), and the fifth furnace entry roller group (41) before entering the steel rolling heating furnace.

9. The billet conveying method for continuous casting and direct delivery to rolling mill according to claim 8, characterized in that, The billet passes through the first hot billet buffer platform (6) to the first connecting roller group (7), then through the second connecting roller group (8) and the third connecting roller group (9) to the fourth connecting roller group (10). The billet is then transported by the fourth steel feeder (15) to the second hot billet unloading platform (12), and then by the second hot billet unloading platform (12) to the second row of steel chains (13). The billet is then unloaded; then the billet is loaded onto the second cold billet loading platform (33), and then by the fourth steel transfer device (34) the billet is moved to the second furnace entry roller group (35). The billet is then moved through the third furnace entry roller group (36) to the fourth furnace entry roller group (38). The billet is then flipped on the fourth furnace entry roller group (38) by the steel turning device (37). Finally, the billet is weighed by the weighing device (40) on the fifth furnace entry roller group (41) and then enters the steel rolling heating furnace.

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