A finishing line for hot-rolled coils

Abstract

The utility model relates to a finishing unit of hot rolled plate coil, including step -by -step beam, plate coil preparation station, plate coil car, uncoiler, pinch roll, welding device, stretch straightening machine, cleaning device, trimming device, transmission roll device and winder, plate coil pass through step -by -step beam and enter plate coil preparation station, plate coil car and uncoiler through pinch roll and send into welding device, plate coil uses transmission roll device transmission and enter stretch straightening machine, cleaning device, trimming device and winder in proper order, and the weld detection instrument between stretch straightening machine and welding device, set up plate coil cross section detection appearance and plate coil edge part defect detection appearance between cleaning device and trimming device, the utility model has the beneficial effect that: increase a finishing unit of hot rolled plate coil between hot rolling process and cold rolling process, improve mill plate shape quality, reduce mill strip breaking rate, improve mill production efficiency, improve economic benefit, improve the ability of cold rolling control plate shape.

Description

Technical Field

[0001] This utility model relates to the field of finishing technology for rolled steel coils, and in particular to a finishing unit for hot-rolled coils. Background Technology

[0002] Hot-rolled coils can be sold directly or used as raw materials for pickling and cold rolling. Improving the quality of hot-rolled coils can not only meet the needs of high-end hot-rolled coil users, but also improve the production efficiency and quality of downstream pickling or cold rolling mills that produce high-value-added cold-rolled products.

[0003] Traditional hot-rolled steel coils have a scaly iron oxide scale on their outer surface. This dense scale affects the pickling effect and speed during the cold rolling pickling process. Furthermore, the scale also impacts the finished product quality and sales of the hot-rolled steel coils. Additionally, the surface of traditional hot-rolled steel coils contains dust that is insoluble in hydrochloric acid. This dust and impurities clog the acid orifices in the acid heat exchanger, requiring periodic perforation and increasing maintenance costs. They also frequently clog the acid nozzles in the acid regeneration furnace, reducing the hourly output of regenerated acid. Utility Model Content

[0004] To overcome the shortcomings of existing technologies, this utility model provides a finishing unit for hot-rolled coils, which adds a finishing unit between the hot rolling process and the cold rolling process to improve the quality of hot-rolled plates; and provides high-quality raw materials for downstream pickling and cold rolling units, thereby improving the production efficiency and product quality of pickling or cold rolling units.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A finishing unit for hot-rolled steel coils includes a walking beam, a coil preparation station, a coil car, an uncoiler, pinch rolls, a welding device, a tension leveler, a cleaning device, an edge trimming device, a drive roller device, and a coiler. The steel coil enters the coil preparation station via the walking beam. The coil preparation station is equipped with a shearing knife for cutting defective ends of the coil. The coil is sequentially transported by the pinch rolls through the coil car and the uncoiler to the welding device. The coil is then conveyed by the drive roller device into the tension leveler, the cleaning device, the edge trimming device, and the coiler. A weld inspection instrument is installed between the tension leveler and the welding device, and a coil cross-section inspection instrument and a coil edge defect inspection instrument are installed between the cleaning device and the edge trimming device.

[0007] Furthermore, the welding device includes a straightener, a cross-cutting shear, and a welding machine, with the cross-cutting shear located after the straightener and the welding machine located after the cross-cutting shear.

[0008] Furthermore, the cleaning device includes a cleaning tank, a cleaning water circulation pump, a cleaning valve, a filter, a squeeze roller, an air purging system, a dryer, a cleaning water circulation tank, a drain valve, and a mud hopper. The cleaning tank outlet is equipped with a squeeze roller, an air purging system is installed after the cleaning tank, and a dryer is installed after the air purging system. The cleaning water circulation pump, cleaning valve, and filter are sequentially installed at the front end of the cleaning tank inlet. Several cleaning water circulation tanks are connected in series in front of the cleaning water circulation pump. Each cleaning water circulation tank has a drain valve at its bottom, and each drain valve has a mud hopper at its bottom.

[0009] Furthermore, cleaning tank rollers are installed at the head and tail of the cleaning tank, and cleaning spray beams are installed at the top and bottom of the cleaning tank.

[0010] Furthermore, the bottom of the cleaning tank is provided with an inclined surface.

[0011] Furthermore, the edge-cutting device includes a plate coil centering device, an edge-cutting shear, an edge-breaking shear, a waste edge hopper, and a slitting flying shear. After passing through the plate coil centering device, the plate coil passes through the edge-cutting shear and the slitting flying shear in sequence. The edge-breaking shear is set at the waste edge outlet position of the edge-cutting shear, and the waste edge hopper is set at the outlet of the edge-breaking shear.

[0012] Furthermore, the transmission roller device includes a #1 transmission roller, a movable inlet looper guide roller, a guide roller, a #2 transmission roller, an outlet looper guide roller, a #3 transmission roller, and a #4 guide roller. The tension straightener and the welding device transmit the plate roll through the #1 transmission roller, the movable inlet looper guide roller, and the guide roller. The cleaning device and the edge trimming device transmit the plate roll through the #2 transmission roller, the guide roller, the outlet looper guide roller, and the #3 transmission roller. The #4 guide roller feeds the plate roll into the coiler.

[0013] Furthermore, the stretching straightener is equipped with two sets of drive rollers and two sets of straightening devices. The two sets of drive rollers are located on the head and tail sides of the stretching straightener, and the two sets of straightening devices are located in the middle of the stretching straightener. The straightening devices include small-diameter straightening work rollers, which are alternately arranged on the upper and lower surfaces of the plate coil.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1) Add a finishing unit for hot-rolled coils between the hot rolling and cold rolling processes to improve the quality of hot-rolled plates; provide high-quality raw materials for downstream pickling and cold rolling units, improve the production efficiency and product quality of pickling or cold rolling units, meet the needs of high-end users, improve the quality of mill plate shape, reduce the mill strip breakage rate, improve mill production efficiency, increase economic benefits, and improve the ability to control plate shape in cold rolling.

[0016] 2) The repeated bending of the plate coil by the stretching and straightening machine causes many fine, fish-scale-like cracks to appear on the surface iron oxide scale. This makes it easier for the pickling solution to penetrate between the iron oxide scale, resulting in a faster pickling speed in the downstream cold rolling pickling unit. This improves the pickling quality and effect of the pickling unit, increases the pickling degree of difficult-to-pick steel grades, improves the quality of the pickled finished product, reduces the maintenance costs of the pickling unit equipment, and increases the annual economic benefits.

[0017] 3) After cleaning during the plate and coil finishing process, the acid heat exchanger of the pickling unit and the nozzles in the roasting furnace of the acid regeneration unit are not clogged, which extends the online service life of the acid heat exchanger, reduces maintenance costs, and improves economic efficiency; it also increases the hourly output of regenerated acid, which ensures the efficient production of the pickling unit.

[0018] 4) Welding defects detected by weld inspection instruments are transmitted to downstream units. When these defects reach the pickling and cold rolling units, the system automatically alerts and slows down to prevent major edge running accidents and cold rolling strip breakage accidents. The cross-section instrument can detect the cross-sectional shape and precise dimensions of each point in the width direction of the coil, providing a reliable basis for feedforward control and stable operation of the cold rolling plate, improving the production efficiency of cold rolled coils, increasing rolling speed, and improving the finished product quality of cold rolled coils. Attached Figure Description

[0019] Figure 1 This is a system diagram of a finishing unit for hot-rolled coils as described in this utility model.

[0020] In the diagram: 1. Walking beam; 2. Plate coil preparation station; 3. Plate coil trolley; 4. Uncoiler; 5. Pinch roller; 6. Straightener; 7. Cross-cutting shear; 8. Welding machine; 9. #1 drive roller; 10. Movable inlet looper guide roller; 11. #1 guide roller; 12. Weld seam inspector; 13. #2 guide roller; 14. Tensile straightener; 15. Cleaning tank; 16. Cleaning water circulation pump; 17. Cleaning valve; 18. Filter; 19. Cleaning tank idler roller; 20. Cleaning spray beam; 21. Squeeze roller. 22. Air purging; 23. Dryer; 24. #2 drive roller; 25. Coil cross-section inspector; 26. #3 guide roller; 27. Export looper guide roller; 28. #3 drive roller; 29. ​​Coil edge defect inspector; 30. Coil centering device; 31. Edge trimming shear; 32. Broken edge shear; 33. Waste edge hopper; 34. Slitting flying shear; 35. #4 guide roller; 36. Winding machine; 37. Cleaning water circulation tank; 38. Drain valve; 39. Mud hopper; 40. Fresh water inlet point. Detailed Implementation

[0021] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings:

[0022] like Figure 1As shown, in a finishing unit for hot-rolled coils, the coils on the walking beam 1 are transported to the coil preparation station 2. The coil preparation station 2 centers the coils to ensure that the centerline of the coil is aligned with the centerline of the unit when the coils are loaded onto the uncoiler 4. The coil preparation station 2 is equipped with shearing blades that cut the head of the coil every 2 meters, making 2 to 4 cuts to remove the tongue and sickle bends at the head of the coil. The coils on the coil preparation station 2 are then transported to the uncoiler via a coil car. The pinch rollers 5 guide the strip head into the straightener 6 in the welding device. The straightener 6 straightens the strip head, and the strip head is then sheared by the cross-cutting shear 7 before welding. The previous coil on the unit is released from the uncoiler 4, and the tail of the previous coil remains. At a position 4 meters in front of the cross-cutting shear 7, the cross-cutting shear 7 cuts the tail of the strip, making one cut every 2 meters, for a total of 2 cuts; the tail of the previous roll of strip advances to the side of the welding machine 8 near the #1 drive roller 9, ready for welding; the head of the next roll of strip enters the inlet side of the welding machine 8, and the welding machine 8 welds the heads and tails of the two rolls. During the inlet section operation, the rolls pass sequentially through the #1 drive roller 9, the movable inlet looper guide roller 10, the #1 guide roller 11, and the #2 guide roller 13 into the stretching straightener 14. The stretching straightener 14 has straightening and scale-breaking functions. After passing through the stretching straightener 14, the rolls enter the cleaning tank 15 of the cleaning device. The cleaning tank rollers 19 in the cleaning tank 15 convey the rolls, which are then cleaned... Cleaning spray beams 20 are installed on the upper and lower surfaces of the sheet roll in the washing tank 15. Two cleaning spray beams 20 are installed on each of the upper and lower surfaces of the sheet roll, arranged along the width direction of the sheet roll. Each cleaning spray beam 20 has 30 to 40 nozzles. During cleaning, cleaning water is sprayed onto the upper and lower surfaces of the sheet roll to remove dust. After passing through the washing tank 15, the sheet roll passes through the squeezing roller 21 to remove surface moisture and then enters the air blowing 22. The air blowing 22 has a set of air blowing beams at the top and bottom, arranged along the width direction of the sheet roll. Each blowing beam has 30 to 40 nozzles, and compressed air is used to blow away surface moisture. After blowing, the sheet roll enters the dryer 23. The dryer 23 consists of a heat exchanger and a fan, and is used to dry the surface of the plate coil. The dried plate coil passes through the No. 2 drive roller 24, the No. 3 guide roller 26, the outlet looper guide roller 27 and the No. 3 drive roller 28 in sequence. After being centered by the plate coil centering device 30 of the edge cutting device, it enters the edge cutting shear 31. The edge strips of 5-20mm at the edge of the plate coil are cut off. The edge strips enter the edge breaking shear 32. The edge breaking shear 32 cuts the edge strips into small segments of 200-250mm in length. The edge strips enter the waste edge hopper 33. The plate coil that has passed through the edge cutting shear 31 is used for slitting by the slitting flying shear 34. After being cut by the slitting flying shear 34, the plate coil passes through the No. 4 guide roller 35 and enters the coiler 36 to be re-wound.A weld inspection instrument 12 is installed between the tension straightening machine 14 and the welding device. The weld is inspected by the weld inspection instrument 12. As the weld passes through the weld inspection instrument 12, the system automatically records and tracks the position of the weld. A plate coil cross-section inspection instrument 25 and a plate coil edge defect inspection instrument 29 are installed between the cleaning device and the edge trimming device. The plate coil cross-section inspection instrument 25 detects the cross-sectional shape of the plate coil. Using the plate coil cross-section inspection instrument 25, the cross-sectional shape of the entire plate coil in the width direction can be detected, providing a reliable reference for mill plate shape adjustment. If the plate coil width cross-sectional dimension exceeds... Severe deviations can lead to deterioration of the rolled sheet shape and strip breakage due to excessive tilting during cold rolling. Based on the detection results of the cross-section inspection instrument, there are three possible handling methods: If the deviation is within the specified range, the cold rolling mill adjusts the set values ​​of the bending rolls and tilting values ​​according to the data transmitted to the cold rolling mill; if the cross-sectional dimension deviation at a certain point along the length of the coil is large, speed reduction measures are implemented when the deviation point reaches the rolling mill, based on the tracking data transmitted to the cold rolling mill; if the cross-sectional dimension deviation at a certain point along the length of the coil or the entire coil is severely excessive, material is not supplied to the pickling unit and cold rolling mill; edge defects of the coil are detected using the coil edge inspection instrument 29. The coil edge inspection instrument 29 can detect edge notches, cracks, and camber defects of the coil. These defects can cause edge breakage and strip slippage accidents. Speed ​​reduction measures are taken after these defects are detected. Notches and cracks, due to stress concentration, can easily cause high-speed strip breakage during cold rolling. Sickle bends prevent the cold rolling mill from biting in straight, causing strip breakage. When a defect point passes through the edge shear, the operator presses the defect point tracking button, and the system automatically records the defect point's position on the coil. When the defect point reaches the cold rolling mill, either the speed is reduced or the mill is opened to allow it to pass.

[0023] Furthermore, the cleaning device includes a cleaning tank 15, a cleaning water circulation pump 16, a cleaning valve 17, a filter 18, a squeeze roller 21, an air purging system 22, a dryer 23, a cleaning water circulation tank 37, a drain valve 38, and a mud hopper 39. The squeeze roller 21 is installed at the outlet of the cleaning tank 15. An air purging system 22 is installed after the cleaning tank 15, and a dryer 23 is installed after the air purging system 22. The cleaning water circulation pump 16, the cleaning valve 17, and the filter 18 are sequentially installed at the front end of the inlet of the cleaning tank 15. The cleaning water circulation tank... Several cleaning water circulation tanks 37 are connected in series at the front end of the cleaning water circulation pump 16. Each cleaning water circulation tank 37 is equipped with a drain valve 38 at the bottom, and each drain valve 38 is equipped with a mud hopper 39 at the bottom. The cleaning water circulation pump 16 draws cleaning water from the cleaning water circulation tank 37 and sprays it onto the upper and lower surfaces of the plate coil through four cleaning spray beams 20 in the cleaning tank 15. The dust on the surface of the plate coil falls into the bottom of the tank, which has a certain slope. The sloped bottom of the cleaning tank ensures that there is no mud accumulation in the cleaning tank 15. The cleaning water enters the first cleaning tank at the lowest point of the slope. The washing water circulation tank 37 has three connecting pipes between it and the four washing water circulation tanks 37. These connecting pipes are located at the top of each tank and are at the same height, all arranged at an angle. This arrangement prevents mud from accumulating in the connecting pipes and obstructing the flow of washing water among the four tanks 37. The washing water flows sequentially from the first tank 37 through the connecting pipes to the other four tanks. The last tank 37 is connected to the washing water circulation pump 16. The lower part of each tank 37 is conical. To facilitate the concentrated sedimentation and discharge of impurities in the cleaning water, the upper part of the cleaning water in each cleaning water circulation tank 37 is relatively clean, while the lower part is relatively turbid. The cleanliness of the cleaning water in each of the cleaning water circulation tanks 37 gradually increases. After passing through multiple cleaning water circulation tanks 37, the cleaning water in the cleaning water circulation tank 37 is the cleanest. Each cleaning water circulation tank 37 is equipped with a drain valve 38 at the bottom, and each drain valve 38 has a mud hopper 39 at its bottom. When discharging, the drain valve 38 is opened to discharge the mud into the mud hopper 39. Each cleaning water circulation tank 37 discharges 2m³ of mud. 3 Then close the drain valve 38. Then add fresh water to the cleaning water circulation tank 37 through the fresh water inlet point 40.

[0024] Furthermore, the tension straightening machine 14 is equipped with two sets of drive rollers and two sets of straightening devices. The two sets of drive rollers are located on both sides of the head and tail of the tension straightening machine, and the two sets of straightening devices are located in the middle of the tension straightening machine. The straightening devices include small-diameter straightening work rollers, which are staggered on both sides of the upper and lower surfaces of the plate coil. This allows the plate coil to be repeatedly bent under high tension by the small-diameter straightening work rollers, thereby straightening the plate coil, destroying the iron oxide scale on the surface of the plate coil, and creating fine, fish-scale-like cracks on the iron oxide scale on the surface of the plate coil, which facilitates the entry of acid. The two sets of drive rollers establish the tension of the plate coil through the speed difference between the front and rear rollers. The two sets of straightening devices adjust the amount of pressure by raising the lower straightening roller.

[0025] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A finishing unit for hot-rolled steel coils, comprising a walking beam, a coil preparation station, a coil car, an uncoiler, pinch rolls, a welding device, a tension straightener, a cleaning device, an edge trimming device, a drive roll device, and a coiler, characterized in that, The plate coil enters the plate coil preparation station via a walking beam. The plate coil preparation station is equipped with a shearing knife for cutting defective plate ends. The plate coil is then transported sequentially through a plate coil car and an uncoiler via pinch rollers into the welding device. The plate coil is then conveyed sequentially into a tension straightener, a cleaning device, an edge trimming device, and a coiler via a transmission roller device. A weld inspection instrument is installed between the tension straightener and the welding device, and a plate coil cross-section inspection instrument and a plate coil edge defect inspection instrument are installed between the cleaning device and the edge trimming device.

2. The finishing unit for hot-rolled coils according to claim 1, characterized in that, The welding apparatus includes a straightener, a cross-cutting shear, and a welding machine. The cross-cutting shear is located after the straightener, and the welding machine is located after the cross-cutting shear.

3. The finishing unit for hot-rolled coils according to claim 1, characterized in that, The cleaning device includes a cleaning tank, a cleaning water circulation pump, a cleaning valve, a filter, a squeeze roller, an air purging system, a dryer, a cleaning water circulation tank, a drain valve, and a mud hopper. The cleaning tank outlet is equipped with a squeeze roller, an air purging system is installed after the cleaning tank, and a dryer is installed after the air purging system. The cleaning water circulation pump, cleaning valve, and filter are sequentially installed at the front end of the cleaning tank inlet. Several cleaning water circulation tanks are connected in series in front of the cleaning water circulation pump. Each cleaning water circulation tank has a drain valve at its bottom, and each drain valve has a mud hopper at its bottom.

4. A finishing unit for hot-rolled coils according to claim 3, characterized in that, The cleaning tank is equipped with cleaning tank rollers at both ends, and cleaning spray beams are installed at the top and bottom of the cleaning tank.

5. A finishing unit for hot-rolled coils according to claim 3 or 4, characterized in that, The bottom of the cleaning tank is provided with an inclined surface.

6. A finishing unit for hot-rolled coils according to claim 1, characterized in that, The edge-cutting device includes a plate coil centering device, an edge-cutting shear, an edge-breaking shear, a waste edge hopper, and a slitting flying shear. After passing through the plate coil centering device, the plate coil passes through the edge-cutting shear and the slitting flying shear in sequence. The edge-breaking shear is set at the waste edge outlet of the edge-cutting shear, and the waste edge hopper is set at the outlet of the edge-breaking shear.

7. A finishing unit for hot-rolled coils according to claim 1, characterized in that, The transmission roller device includes a #1 transmission roller, a movable inlet looper guide roller, a guide roller, a #2 transmission roller, an outlet looper guide roller, a #3 transmission roller, and a #4 guide roller. The tension straightener and the welding device communicate via the #1 transmission roller, the movable inlet looper guide roller, and the guide roller. The cleaning device and the edge trimming device communicate via the #2 transmission roller, the guide roller, the outlet looper guide roller, and the #3 transmission roller. The #4 guide roller feeds the coil into the coiler.

8. A finishing unit for hot-rolled coils according to claim 1, characterized in that, The stretching straightener is equipped with two sets of drive rollers and two sets of straightening devices. The two sets of drive rollers are located on the head and tail sides of the stretching straightener, and the two sets of straightening devices are located in the middle of the stretching straightener. The straightening devices include small-diameter straightening work rollers, which are staggered on the upper and lower surfaces of the plate coil.

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