Lifting type steel plate post-rolling online rapid cooling device and cooling method

Abstract

The present invention discloses a lifting type online rapid cooling device and cooling method for steel plates after rolling, belonging to the field of rapid cooling. The device comprises a cooling assembly, a collection hood, and a transmission device. The cooling assembly is arranged on both sides of the transmission device, and the collection hood is arranged above the cooling assembly. The cooling assembly comprises a cooling water trough, a water reservoir, and a sedimentation tank. The first end of the cooling water trough is connected to the transmission device, the second end of the cooling water trough is provided with a water inlet and a water outlet, an inlet pipe is provided between the water reservoir and the water inlet, and a lifting mechanism is provided inside the cooling water trough. The lifting mechanism includes a rail hydraulic device. The present invention combines online cooling with traditional water trough cooling, achieving a faster cooling speed while ensuring cooling uniformity, so that steel materials with simple components can have performance indicators that meet diverse requirements.

Description

Technical Field

[0001] The present invention relates to the field of rapid cooling, and in particular to a lifting type online rapid cooling device and cooling method for steel plates after rolling. Background Art

[0002] As demand for hot-rolled steel continues to increase in my country's steel market, higher requirements are being placed on its specifications, varieties, mechanical properties, dimensional accuracy, and quality grades. Rapid cooling after rolling can improve the mechanical properties of the finished product, but it is difficult to control the uniformity of cooling. Controlling the cooling uniformity of hot-rolled steel plate not only affects the surface quality grade of the steel plate, but also the type and mechanical properties of the final steel product. To meet the performance and quality requirements of the rolled steel plate, controlled rolling and controlled cooling technology has been widely used in the production process of hot-rolled steel plate. To achieve the production of resource-saving, high-performance steel, innovation in post-rolling cooling technology is necessary.

[0003] With the emergence of new steel grades, cooling temperatures are gradually moving towards lower temperatures, while cooling rates and intensities are constantly increasing. However, uneven cooling during the cooling process can lead to significant issues with plate shape. This uneven cooling directly results in temperature differences across the steel plate, causing uneven microstructure and performance, and reducing the yield rate. This also creates harmful thermal and structural stresses within the steel plate. If these stresses reach the critical yield point, the plate will warp, resulting in serious shape issues. Summary of the Invention

[0004] In order to solve the technical problems mentioned in the above background technology, the present invention provides a lifting type online rapid cooling device and cooling method for steel plates after rolling. The present invention combines online cooling with traditional water tank cooling to achieve faster cooling speed while ensuring cooling uniformity. At the same time, through the mutual cooperation between the cooling water tank and the nozzle, the cooling water can be directly sprayed on the steel plate, which can break the air mold generated on the surface of the steel plate during cooling, ensuring the uniformity of the steel plate during cooling, and at the same time, the steel plate is immersed in cooling water to further ensure the rapidity of cooling.

[0005] Specifically, the present invention provides the following technical solutions: The present invention provides a lifting type online rapid cooling device for steel plates after rolling, comprising a cooling assembly, a collecting hood and a transmission device, wherein the cooling assembly is arranged on both sides of the transmission device, and the collecting hood is arranged above the cooling assembly; the cooling assembly comprises a cooling water trough, a water reservoir and a sedimentation tank, the first end of the cooling water trough is connected to the transmission device, the second end of the cooling water trough is provided with a water inlet and a water outlet, a water inlet pipe is provided between the water reservoir and the water inlet, a lifting mechanism is provided inside the cooling water trough, the lifting mechanism comprises a rail and a hydraulic device, the rail and the hydraulic device are both arranged inside the cooling water trough, the rail and the hydraulic device are both arranged parallel to the edge of the cooling water trough, and one end of the hydraulic device is provided below the lower surface of the cooling water trough; a nozzle is provided inside the cooling water trough, and the nozzle is provided The cooling water tank is connected to the cooling water tank through a sedimentation pipe; the cooling assembly is connected to the transmission device at a driving mechanism; the collecting cover is arranged above the cooling assembly, the collecting end of the collecting cover faces the cooling water tank, the discharge end of the collecting cover is connected to the collecting pipe, and the collecting pipe is provided with a liquid collecting pipe; the transmission device includes a support frame, a sliding support plate and a roller, the sliding support plate and the roller are both arranged on the support frame, the two ends of the roller are respectively movably connected to the upper surface of the support frame, the sliding support plate is arranged above the support frame, the sliding support plate can be moved to the top of the cooling water tank above the support frame by the traction of the guide rail and the driving mechanism, and the two sides of the sliding support plate are provided with tooth grooves cooperating with the driving mechanism and a plurality of protrusion structures cooperating with the track.

[0006] Furthermore, a water pump is provided in the water reservoir, a water inlet end of the water pump is connected to the liquid in the water reservoir, and a water outlet end of the water pump is connected to the first end of the water inlet pipe.

[0007] Furthermore, an extended spiral structure is provided on the collection pipe, the lowest point of the spiral structure is connected to the first end of the liquid collecting pipe, and the second end of the liquid collecting pipe is provided above the sedimentation tank.

[0008] Furthermore, the liquid flows from the water reservoir through the water inlet pipe and enters the water inlet hole, passes through the pipeline, and is sprayed out from the surroundings and bottom of the nozzle cooling water tank.

[0009] Furthermore, the driving mechanism operates in the forward direction to transport the sliding pallet above the support frame to the top of the cooling water trough. When the sliding pallet is above the cooling water trough, the raised structure is directly above the track groove, and the multiple hydraulic devices will drive the sliding pallet to move to the inside of the cooling water trough. After cooling is completed, the hydraulic device rises to the raised structure and disengages from the track, and the driving mechanism operates in the reverse direction to move the sliding pallet to the support frame.

[0010] Furthermore, a first cooling water trough and a second cooling water trough are respectively provided on both sides of the support frame on which the sliding support plate is provided. When work starts, the first sliding support plate is maintained above the first cooling water trough. When the steel plate to be cooled moves to the second sliding support plate on the support frame, the first sliding support plate above the cooling water trough pushes the second sliding support plate on the support frame to move toward the top of the second cooling water trough. When the driving mechanism above the second cooling water trough engages with the tooth groove of the second sliding support plate, the driving mechanism on the second cooling water trough will drive the second sliding plate to move to the top of the second cooling water trough, thereby cooling the steel plate.

[0011] Furthermore, a first roller and a second roller are provided on the support frame, the sliding support plate is provided on the second roller, and a guide rail is provided above the cooling water trough and the second roller. The sliding support plate is displaced above the cooling water trough and above the support frame where no rollers are provided through the guide rail.

[0012] Furthermore, the sedimentation tank is connected to the water outlet of the cooling water trough through a pipeline and a valve. The valve is closed during operation and opened after the work is completed to allow cooling water and oxide scale to enter the sedimentation tank; the water reservoir is connected to the sedimentation tank through a pipeline, and a filter is provided at the connection between the water reservoir and the sedimentation tank. The filter is 30-50 cm higher than the bottom of the sedimentation tank, and the bottom of the sedimentation tank has a slope of 30-45° and is provided with a slag discharge port; after completing a cooling process, the water reservoir stores the cooling water in the cooling water trough in the water reservoir.

[0013] Furthermore, when the sheet material drops to 1 / 3 of the distance from the bottom of the cooling water tank, the nozzle begins to spray the sheet material and gradually immerses the steel plate. When the immersion height reaches 30-50 cm above the upper surface of the steel plate, the steel plate is cooled. After cooling is completed, the valve is opened to discharge the cooling water and oxide scale into the sedimentation tank.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The present invention can cooperate with the cooling component and the transmission device so that the steel plate to be cooled is sent from the upper part of the cooling water tank to the inside of the cooling water tank. The nozzle in the cooling water tank sprays the surface of the steel plate in all directions, helping to break the air film generated on the surface of the steel plate during cooling and improving the uniformity of the cooling of the steel plate; the cooling water gradually fills the cavity while spraying the steel plate, so that the steel plate is immersed in the cooling water, thereby improving the rapidity of the cooling of the steel plate; after cooling is completed, the cooling water flows to the sedimentation tank through the pipeline, and enters the water storage tank after precipitation and filtration of the oxide scale in the sedimentation tank. The water pump is used to input the water into the pipeline of the cooling water tank for the next cooling, thereby improving the utilization efficiency of water resources. The bottom of the sedimentation tank is provided with a slope of 30-45 degrees and a slag discharge port. After a certain working period, the scrap truck is placed at the bottom of the sedimentation tank and the slag discharge port is opened to easily complete the cleaning work.

[0016] 2. The support frame of the present invention is provided with cooling water troughs and dedicated tracks connecting the two cooling water troughs on both sides. While one steel plate is cooling, the conveyor can continue to convey other uncooled steel plates to the second sliding pallet in the middle. The second cooling water trough can circulate cooling water to prepare for the next cooling cycle. After the steel plates are cooled, the first sliding pallet transports the cooled steel plates to the horizontal tracks, and the driving mechanism transports the cooled steel plates to the conveying position. The uncooled steel plates are then transported to the second cooling water trough, which is ready for cooling. This improves cooling efficiency and production efficiency.

[0017] 3. The present invention is arranged at the rear of the rolling mill. After the steel plate comes out of the rolling mill, it is directly cooled online using the waste heat, eliminating the step of heating the steel plate at a later stage, reducing the number of firings, and achieving energy conservation.

[0018] 4. The present invention is provided with a collecting hood above the cooling water trough, which collects the high-temperature water vapor generated by the steel plate during the cooling process, reduces the oxidizing effect of the high-temperature water vapor on the steel plate, improves the production environment, and improves the cooling quality of the steel plate. A liquid collecting pipe is provided at the lowest point of the bend of the collecting pipe, which discharges the condensed water vapor into the sedimentation tank, thereby improving the utilization efficiency of water resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 This is a schematic structural diagram of the lifting type online rapid cooling device for steel plates after rolling according to the present invention;

[0021] Figure 2 This is a schematic diagram of the cooling water circulation of the lifting type online rapid cooling device for steel plates after rolling according to the present invention;

[0022] Figure 3 This is a schematic diagram of the lifting working process of the lifting type steel plate post-rolling online rapid cooling device of the present invention;

[0023] Figure 4 This is a schematic diagram of the overall structure of the transmission device of the lifting type steel plate post-rolling rapid online cooling device of the present invention;

[0024] Figure 5 It is a schematic diagram of the lifting structure of the lifting type steel plate post-rolling online rapid cooling device of the present invention.

[0025] Figure numbers: 1. Steel plate; 2. First roller; 3. Support frame; 4. Collecting hood; 5. Guide rail; 6. Driving mechanism; 7. Hydraulic device; 8. Cooling water trough; 9. Waterproof roller; 10. Sliding support plate; 11. Water pump; 12. Water reservoir; 13. Sedimentation tank; 14. Nozzle; 15. Valve; 16. Slag discharge port; 17. Filter; 801. Internal pipeline; 802. Delivery pipe. DETAILED DESCRIPTION

[0026] The technical solutions of the present invention will be clearly and completely described below through specific embodiments. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

[0027] like Figures 1 to 5 The shown device is a lifting type online rapid cooling device for steel plates after rolling, which includes a cooling component, a collecting hood 4 and a transmission device. The cooling components are arranged on both sides of the transmission device, and the collecting hood 4 is arranged above the cooling component; the cooling component includes a cooling water trough 8, a water reservoir 12 and a sedimentation tank 13. The first end of the cooling water trough 8 is connected to the transmission device, and the second end of the cooling water trough 8 is provided with a water inlet and a water outlet. The water reservoir 12 is connected to the water inlet through a water inlet pipe. A lifting mechanism is provided inside the cooling water trough 8, and the lifting mechanism includes a rail and a hydraulic device 7. The rail and the hydraulic device are both arranged inside the cooling water trough 8, and the rail and the hydraulic device are both arranged parallel to the edges of the cooling water trough 8. One end of the hydraulic device is arranged below the lower surface of the cooling water trough; a nozzle 14 is provided inside the cooling water trough 8, and the nozzle 14 is arranged on the upper surface of the side walls and bottom of the cooling water trough 8; the bottom of the sedimentation tank 13 is connected to the bottom of the cooling water trough 8 through a sedimentation pipe.

[0028] A driving mechanism 6 is provided at the connection between the cooling component and the transmission device; the collection hood 4 is arranged above the cooling component, the collection end of the collection hood 4 faces the cooling water trough 8, the discharge end of the collection hood 4 is connected to the collection pipe, and the collection pipe is provided with a liquid collecting pipe; the transmission device includes a support frame 3, a sliding pallet 10 and a roller, the sliding pallet 10 and the roller are both arranged on the support frame 3, the two ends of the roller are movably connected to the upper surface of the support frame 3, the sliding pallet 10 is arranged above the support frame 3, the sliding pallet 10 can be moved to the top of the cooling water trough 8 above the support frame 3 through the traction of the guide rail and the driving mechanism 6, and the two sides of the sliding pallet 10 are provided with tooth grooves cooperating with the driving mechanism 6 and a plurality of protrusion structures cooperating with the track.

[0029] The driving mechanism 6 consists of three parts: a motor, a gear and a rack. The output shaft of the motor is connected to the gear, thereby driving the gear to rotate. The rack is fixed on both sides of the sliding tray, and the sliding tray is driven to move horizontally through the engagement of the gear and rack.

[0030] A water pump 11 is provided in the water reservoir 12 , a water inlet end of the water pump 11 is connected to the liquid in the water reservoir 12 , and a water outlet end of the water pump 11 is connected to a first end of a water inlet pipe.

[0031] An extended spiral structure is provided on the collection pipe, the lowest point of the spiral structure is connected to the first end of the liquid collecting pipe, and the second end of the liquid collecting pipe is provided above the sedimentation tank 13.

[0032] The liquid flows from the water reservoir 12 through the delivery pipe 802 and enters the water inlet hole, passes through the internal pipeline 801, and is sprayed out from the surroundings and bottom of the cooling water tank 8 through the nozzle 14.

[0033] The driving mechanism 6 runs forward to transport the sliding pallet 10 above the support frame 3 to the top of the cooling water trough 8. When the sliding pallet 10 is above the cooling water trough 8, the raised structure is directly above the track groove, and multiple hydraulic devices will drive the sliding pallet 10 to move to the inside of the cooling water trough 8. After cooling is completed, the hydraulic device rises to the raised structure and leaves the track, and the driving mechanism 6 runs in the reverse direction to move the sliding pallet 10 to the support frame 3.

[0034] A first cooling water trough and a second cooling water trough are respectively provided on both sides of the support frame 3 provided with a sliding support plate 10. When the work starts, the first sliding support plate is maintained above the first cooling water trough. When the steel plate 1 to be cooled moves to the second sliding support plate on the support frame 3, the first sliding support plate above the cooling water trough 8 pushes the second sliding support plate on the support frame 3 to move toward the top of the second cooling water trough. When the driving mechanism 6 above the second cooling water trough engages with the tooth groove of the second sliding support plate, the driving mechanism 6 on the second cooling water trough will drive the second sliding plate to move to the top of the second cooling water trough, thereby cooling the steel plate 1; the rollers on the movable support plate are waterproof rollers 9.

[0035] The support frame 3 is provided with a first roller and a second roller. The bearings at both ends of the individual rollers of the first roller 2 are movably connected to the support frame 3. The second roller is the support frame 3 where the individual roller 2 is not provided. The first sliding support plate and the second sliding support plate are both provided above the second roller for movement. A guide rail 5 is provided above the cooling water trough 8 and the second roller. The sliding support plate 10 is displaced above the cooling water trough 8 and above the support frame 3 where no rollers are provided through the guide rail 5.

[0036] At work

[0037] After the steel plate 1 comes out of the rolling mill, it is transferred by the first roller to the sliding support plate 10 above the second roller. The driving mechanism 6 provides the power for lateral movement to drive the sliding support plate 10 to move. The guide rail 5 provides a guiding function, thereby driving the first sliding support plate to move toward the top of the first cold water tank. The sliding support plate 10 drives the steel plate 1 to enter the top of the left cooling water tank 8. The hydraulic device 7 in the cooling water tank 8 provides the power for up and down movement. The guide rail 5 provides a guiding function. The first sliding support plate is sent into the interior of the cooling water tank 8 as shown in FIG. Figure 3 As shown, the cooling system starts to work. When the first sliding support plate drops to 1 / 3 of the distance from the bottom of the cooling water tank, the water pump 11 draws cooling water from the water reservoir 12, enters the internal pipeline 801 of the water tank through the delivery pipe 802, and is sprayed on the steel plate 1 through several nozzles 14 built into the inner wall of the cooling water tank 8 and continuously fills the cavity of the cooling water tank 8. The nozzle 14 starts to spray the sheet and gradually immerses the steel plate. When the immersion height reaches 30-50 cm above the upper surface of the steel plate, the injection of cooling water is stopped. After the cooling process is completed, the valve 15 on the cooling water tank 8 is opened, and the cooling water and oxide scale flow into the sedimentation tank 13 through the pipeline. Due to the high density of oxide scale, it will settle at the bottom of the tank, and the cooling water flows into the water reservoir 12 through the filter 17. Finally, the hydraulic device 7 provides power to send the first sliding pallet back to the top, and the uncooled steel plate 1 continues to be transferred to the second sliding pallet between the two cooling water troughs through the first roller 2. The driving mechanism 6 provides power to send the cooled first sliding pallet to the transfer position. The second sliding pallet is hit by the first sliding pallet, causing it to move, so that the driving mechanism 6 of the second cooling water trough drives the second sliding pallet to move to the top of the second cooling water trough for the cooling process, and this reciprocating process is carried out.

[0038] The sedimentation tank 13 is connected to the outlet of the cooling water trough through a pipeline and a valve 15. The valve 15 is closed during operation and opened after the work is completed so that cooling water and oxide scale can enter the sedimentation tank 13. The side wall of the water reservoir 12 is connected to the side wall of the sedimentation tank 13 through a pipeline. A filter screen 17 is provided at the connection between the water reservoir 12 and the sedimentation tank 13. The filter screen 17 is 30-50 cm higher than the bottom of the sedimentation tank 13. The bottom of the sedimentation tank 13 has an inclination of 30-45° and is provided with a slag discharge port 16. After completing a cooling process, the water reservoir 12 stores the cooling water in the cooling water trough in the water reservoir 12.

[0039] The embodiments described above are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A lifting type online rapid cooling device for steel plates after rolling, characterized in that: It includes a cooling assembly, a collecting cover and a transmission device, wherein the cooling assembly is arranged on both sides of the transmission device, and the collecting cover is arranged above the cooling assembly; The cooling assembly includes a cooling water trough, a water reservoir and a sedimentation tank, the first end of the cooling water trough is connected to the transmission device, the second end of the cooling water trough is provided with a water inlet hole and a water outlet hole, a water inlet pipe is provided between the water reservoir and the water inlet hole, a lifting mechanism is provided inside the cooling water trough, the lifting mechanism includes a track and a hydraulic device, the track and the hydraulic device are both provided inside the cooling water trough, the track and the hydraulic device are both provided parallel to the edge of the cooling water trough, and one end of the hydraulic device is provided below the lower surface of the cooling water trough; a nozzle is provided inside the cooling water trough, and the nozzle is provided on the upper surface of the surrounding side walls and the bottom of the cooling water trough; the bottom of the sedimentation tank is connected to the bottom of the cooling water trough through a sedimentation pipe; a driving mechanism is provided at the connection between the cooling assembly and the transmission device; The collecting hood is arranged above the cooling assembly, the collecting end of the collecting hood faces the cooling water trough, the discharge end of the collecting hood is connected to a collecting pipe, and a liquid collecting pipe is provided on the collecting pipe; the transmission device comprises a support frame, a sliding support plate and a roller, and the sliding support plate and the roller are all arranged on the support frame, and the two ends of the roller are movably connected to the upper surface of the support frame respectively, and the sliding support plate is arranged above the support frame, and the sliding support plate can be pulled and moved to the top of the cooling water trough above the support frame by the direction of the guide rail and the driving mechanism, and the two sides of the sliding support plate are provided with tooth grooves cooperating with the driving mechanism and a plurality of protrusion structures cooperating with the track; A water pump is provided in the water reservoir, the water inlet end of the water pump is connected to the liquid in the water reservoir, and the water outlet end of the water pump is connected to the first end of the water inlet pipe; The collecting pipe is provided with an extended spiral structure, the lowest point of the spiral structure is connected to the first end of the collecting pipe, and the second end of the collecting pipe is provided above the sedimentation tank; The sedimentation tank is connected to the water outlet of the cooling water trough through a pipeline and a valve. The valve is in a closed state during operation and is opened after the work is completed so that cooling water and oxide scale can enter the sedimentation tank; the water reservoir is connected to the sedimentation tank through a pipeline. A filter is provided at the connection between the water reservoir and the sedimentation tank. The filter is 30-50 cm higher than the bottom of the sedimentation tank. The bottom of the sedimentation tank has an inclination of 30-45° and is provided with a slag discharge port; after completing a cooling process, the water reservoir stores the cooling water in the cooling water trough in the water reservoir.

2. The lifting type online rapid cooling device for steel plates after rolling according to claim 1, characterized in that: The liquid flows from the water reservoir through the water inlet pipe and then enters the water inlet hole, passes through the pipeline, and is sprayed out from the surroundings and bottom of the nozzle cooling water tank.

3. The lifting type online rapid cooling device for steel plates after rolling according to claim 2, characterized in that: The driving mechanism operates in the forward direction to transport the sliding pallet above the support frame to the top of the cooling water trough. When the sliding pallet is above the cooling water trough, the raised structure is directly above the track groove. The multiple hydraulic devices will drive the sliding pallet to move into the cooling water trough. After cooling is completed, the hydraulic device rises to the raised structure and disengages from the track. The driving mechanism operates in the reverse direction to move the sliding pallet to the support frame.

4. The lifting type online rapid cooling device for steel plates after rolling according to claim 3, characterized in that: A first cooling water trough and a second cooling water trough are respectively provided on both sides of the support frame on which the sliding support plate is provided. When work starts, the first sliding support plate is maintained above the first cooling water trough. When the steel plate to be cooled moves to the second sliding support plate on the support frame, the first sliding support plate above the cooling water trough pushes the second sliding support plate on the support frame to move toward the top of the second cooling water trough. When the driving mechanism above the second cooling water trough engages with the tooth groove of the second sliding support plate, the driving mechanism on the second cooling water trough will drive the second sliding plate to move to the top of the second cooling water trough, thereby cooling the steel plate.

5. The lifting type online rapid cooling device for steel plates after rolling according to any one of claims 1 to 4, characterized in that: The support frame is provided with a first roller and a second roller, the sliding support plate is provided on the second roller, and a guide rail is provided above the cooling water trough and the second roller. The sliding support plate is displaced above the cooling water trough and above the support frame where no rollers are provided through the guide rail.

6. The cooling method for the lifting type post-rolling rapid cooling device for steel plates according to claim 1, characterized in that: When the sheet metal drops to 1 / 3 of the distance from the bottom of the cooling water tank, the nozzle begins to spray the sheet metal and gradually immerses the steel plate. When the immersion height reaches 30-50 cm above the upper surface of the steel plate, the steel plate is cooled. After cooling is completed, the valve is opened to discharge the cooling water and oxide scale into the sedimentation tank.

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