A hot rolling coiler cooling method

Abstract

The application discloses a hot rolling coiling machine cold coiling method, and the cold coiling method comprises the following steps: starting the coiling fast-stop protection device when normal coiling conditions are not met; detecting the distance between the intermediate blank tail and the flying shear in the finishing rolling area of the strip steel with the thickness less than 11mm; starting the shearing when the distance is greater than 5m; and rolling out all the strip steel when the distance is less than 5m; starting the fast-stop finishing rolling unit interlock when the thickness of the strip steel is greater than or equal to 11mm; starting the fast-stop roll gap fast opening; returning the strip steel to the intermediate blank and pushing the strip steel out of the line for treatment; lifting the coiling laminar flow to the highest position; lifting the three pinch rollers of the coiling machine to the maximum position; and closing the valve to zero position. The strip steel head is more flat and easy to be coiled by using the downward pressing and returning of the pinch rollers. The strip steel of the laminar flow roller is stretched and flattened, and the coiling quality is improved by setting the cold coiling speed and keeping the speed difference to form a certain tension. The coiling tightness of the steel coil is improved by the pressure of the guide roller, and the occurrence of the strip steel being unable to be unloaded from the scattered coiling frame is prevented by the position protection control of the coiling aid roller and the uncoiling trolley.

Description

Technical Field

[0001] This invention belongs to the field of hot continuous rolling technology, specifically relating to a cold coiling method for a hot rolling coiler. Background Technology

[0002] In hot strip rolling production lines, steel jamming accidents can occur due to factors such as power outages, hydraulic failures, and inadequate conditions in the coiling area. In such cases, cold coiling is necessary. Existing methods have limitations: the range of cold-rolled coil thickness is limited; thicker strips require cutting and hoisting, which is time-consuming and labor-intensive. The inertial impact of the coil head on the equipment not only damages the equipment but also causes the strip head to fold, requiring further cutting. Poor cold coil shape results in large, bowl-shaped coils or barrel-shaped coils, making unloading difficult and prone to coil drop accidents. Furthermore, poor overall coil tightness or uncoiling during the cold rolling process can cause the coil diameter to exceed the coiler frame, preventing unloading. Summary of the Invention

[0003] The purpose of this invention is to provide a cold coiling method for a hot rolling coiler.

[0004] The technical solution adopted by this invention to solve its technical problem is: a cold coiling method for a hot-rolled coiler, comprising the following steps:

[0005] 1) When the strip head reaches the laminar flow G8 roller table, it is detected that the coiler does not have normal coiling conditions. The coiler is started to stop quickly. The No. 1 pinch roll, No. 2 pinch roll and No. 3 pinch roll of the coiler rise to the highest position and the valve closes to the lowest position. The strip head will enter the coil catcher by inertial buffer.

[0006] 2) Lower the No. 1 pinch roll until it contacts the strip and the pressure is displayed. Adjust the pressure according to the actual situation. The machine roller conveyor, G9 roller conveyor and 3 pinch rolls reverse at a speed of 1m / s to transport the strip head to the middle of the parallel section of the No. 1 side guide plate.

[0007] 3) Set the position roll gap and cold rolling speed. Select coiler No. 1 for cold rolling. Set the position roll gap. Set the opening of side guide plate No. 1 to strip width W + 20mm. Lower front pressure roller No. 1 to strip thickness H + 20mm. Lower pinch roller No. 1 to strip thickness H + 0.5mm. Open the gate 120mm. The distance between the gate and the upper pinch roller is less than strip thickness H. Lower the guide roller to strip thickness H * 6mm. Close auxiliary coiling roller No. 1 to strip thickness H + 2mm. Close auxiliary coiling roller No. 2 to strip thickness H + 1.5mm. Close auxiliary coiling roller No. 3 to strip thickness H + 1mm. The drum is in a pre-expanded state of 745mm. Close the drum support arm. Set the cold rolling speed. The speed difference forms tension cold rolling.

[0008] 4) Start cold coiling. After the strip head has wound 2-3 turns on the drum, start the drum to fully expand. After 6-7 turns and the cold coil tension is established, the No. 2 auxiliary coiling roller quickly opens to its maximum position, while the No. 1 and No. 3 auxiliary coiling rollers slowly open. For each increase in coil diameter, the strip thickness H is opened, always maintaining a 20mm distance from the outermost coil. The guide roller applies pressure to the strip for auxiliary cold coiling. The No. 1 side guide plate enters the pressure clamp, and the unloading trolley rises and slowly descends according to the increase in coil diameter. For each increase in coil diameter, the strip thickness H is lowered, always maintaining a 30mm position control. With the brake shoes locked in the released state, the cold coiling speed stops after the tail section enters the coiler. The No. 1 and No. 3 auxiliary coiling rollers remain stationary. The uncoiling trolley rises and enters pressure control. The drum and auxiliary coiling rollers are jogged to rotate forward at a speed of 0.2 m / s to stop the tail section of the strip at the 5 o'clock position of the coiler. The brake shoes of the uncoiling trolley are locked and switched to position control. The guide roller, No. 1 auxiliary coiling roller, and No. 3 auxiliary coiling roller are opened to their maximum positions. The drum retracts to 727 mm. The drum is jogged to rotate in reverse at a speed of 0.1 m / s to confirm that the head section of the strip is separated from the drum. Then, uncoiling is performed to complete the cold coiling.

[0009] Specifically, the cold rolling speed is set as follows: the speed of the roll drum and the auxiliary rolling roller is 2 m / s; the speed of the No. 1 pinch roller and the No. 1 front pressure roller is set to 1.98 m / s; the speed of the G7 roller conveyor, the G8 roller conveyor, and the G9 roller conveyor is set to 1.9 m / s; the speed of the G4 roller conveyor, the G5 roller conveyor, and the G6 roller conveyor is set to 1.8 m / s; and the speed of the G1 roller conveyor, the G2 roller conveyor, and the G3 roller conveyor is set to 1.6 m / s.

[0010] The present invention has the following beneficial effects:

[0011] 1) After the automatic detection fails to meet the normal coiling conditions, the coiling quick stop protection device is activated. In the finishing rolling area where the strip thickness is less than 11 mm, the distance between the tail of the intermediate billet and the flying shear is ≥5 meters after detection. If the distance is <5 meters, all the strip is rolled out. For the thickness of 11 mm or more, the coiling quick stop finishing mill unit interlocks and the quick stop roll gap is opened. All the strip is returned to the intermediate billet ejection point for processing under the ejection line. The coiling layer flow beater is raised to the highest position, the three pinch rolls of the coiler are raised to the maximum position, and the valve is closed to the zero position. This allows the strip head to have a certain space for buffering, avoids head folding, and facilitates rapid cold coiling.

[0012] 2) By using the pinch rollers to press down and reverse, the strip head can be straightened by pressure, making the strip head flatter and easier to roll. By setting the cold rolling speed difference, a certain tension cold rolling is formed, which optimizes the strip shape and improves the roll shape.

[0013] 3) The pressure of the guide rollers improves the coil tightness. The position control of No. 1 and No. 3 coiling rollers and the unloading trolley forms a protective ring to increase the safety of cold coiling and prevent the coil from being unloaded from the hanging frame. It also effectively increases the range of thickness specifications that can be cold-coiled. Attached Figure Description

[0014] Figure 1 This is a simplified flowchart of the present invention. Detailed Implementation

[0015] The invention will now be described in further detail with reference to the accompanying drawings.

[0016] When the strip head reaches the G8 roller table in front of the coiler, the coiler is restarted to check the normal coiling conditions. If the normal coiling conditions are not met, the coiler will automatically start a fast stop in the coiling area to protect the equipment and facilitate cold coiling. (For the finishing mill area where the strip thickness is less than 11 mm, if the distance between the end of the intermediate billet and the flying shear is ≥5 meters after inspection, the shearing will be started quickly; if it is <5 meters, the entire strip will be rolled out. For the thickness of ≥11 mm, the coiling will start a fast stop, and the finishing mill will interlock to start a fast stop, and the roll gap will open quickly. The strip will be returned to the intermediate billet ejection point for processing through the reverse rotation of the roller table and the finishing mill work rolls.) The three pinch rolls of the coiler will rise to their maximum positions, and the valve will close to the zero position. This allows the strip head a certain amount of space to buffer before reaching the coil catcher, preventing the head from folding. The laminar flow water jet is lifted, the coiler drum, pinch rolls, and auxiliary coiling rolls stop rotating, and the laminar flow roller conveyors are delayed in grouping and then stop rotating. Especially the three groups of laminar flow roller conveyors after the last stand of the finishing mill, stop rotating only after the steel is ejected from the last stand of the finishing mill. This prevents strip from accumulating at the large instrument area after finishing milling and damaging the testing instruments, and ensures that the strip accumulation is as flat as possible. The strip head remains in the strip catcher after the coiler unit, and the coiling area mode is switched to manual mode. For example, if coiler No. 1 is selected for cold coiling, after pressing down pinch roll No. 1 to contact the strip, the three pinch rolls and the on-machine roller conveyor, as well as the laminar flow G9 roller conveyor, are reversed. The strip head is then moved to the middle of the parallel section of the No. 1 side guide plate. The downward pressure and reversal of pinch roll No. 1 straightens the strip head, making it easier for cold coiling. The No. 1 side guide plate is closed to guide and center the strip head. The No. 1 pinch roll is closed, the No. 1 gate is opened, the guide roll is lowered, and the drum is pre-stretched. The three auxiliary rolls are set with roll gaps from largest to smallest according to the strip thickness. The drum's movable support arm is closed. The speeds of the drum, auxiliary rolls, pinch rolls, front pressure rolls, and laminar flow rollers are set from high to low with a certain speed difference to create a certain tension to flatten the strip and improve the strip shape and coil shape.

[0017] Using pinch rollers, the strip head is reversed to the middle position of the parallel section of the side guide plate. The equipment position is set according to the strip thickness, and the cold coiling speed is set according to a certain speed difference. Cold coiling is started; the strip head is bitten and bent by the pinch rollers and fed into the gap between the drum and the auxiliary coiling rollers. After the strip head has wound 2-3 turns on the drum, the drum is fully expanded. After 6-7 turns and tension is established, auxiliary coiling roller #2 quickly opens to its maximum position, while auxiliary coiling rollers #1 and #3 slowly open as the coil diameter increases, always maintaining a 20mm distance from the outer ring of the coil. The guide rollers maintain a certain pressure to assist in cold coiling the strip, ensuring coil tightness. The auxiliary pressure value can be set and adjusted according to the strip thickness and deformation resistance. The uncoiling trolley rises and slowly descends as the actual coil diameter increases, always maintaining a 30mm position control from the outer ring of the coil. The uncoiling trolley brake shoes remain in the released state. This constant small-distance position control of the auxiliary coiling rollers and the trolley prevents uncoiling. Then, the No. 1 side guide plate is subjected to a certain pressure clamping control to further ensure the coil shape. The pressure can also be adjusted according to the strip specifications and steel grade. When the tail end enters the coiler, the cold coiling speed stops, the No. 1 and No. 3 auxiliary coiling rollers remain in their current positions, the uncoiling trolley rises and enters pressure control, the drum and auxiliary coiling rollers are jogged to rotate forward at a speed of 0.2 m / s to stop the tail end of the strip at the 5 o'clock position of the coiler, the brake shoes of the uncoiling trolley are locked and switched to position control, the guide roller and the No. 1 and No. 3 auxiliary coiling rollers are opened to the maximum position, the drum retracts to 727 mm, the drum is jogged to rotate in reverse at a speed of 0.1 m / s to confirm the separation of the strip head from the drum, and then uncoiling is performed to complete the cold coiling.

[0018] like Figure 1 A method for cold coiling in a hot-rolled coiler includes the following steps:

[0019] 1) When the strip head reaches the laminar flow G8 roller table, the coiler is found to be not in normal coiling condition. The coiling quick stop is started. The No. 1 pinch roll 1PR, the No. 2 pinch roll 2PR, and the No. 3 pinch roll 3PR of the coiler rise to the highest position. The three coiler gates close to the lowest position. The strip head will enter the coil catcher by inertial buffer.

[0020] 2) Lower the No. 1 pinch roll 1PR until it contacts the strip and the pressure is displayed. Adjust the pressure according to the actual situation and select the minimum effective reverse pressure. The machine roller conveyor, G9 roller conveyor and 3 pinch rolls reverse at a speed of 1m / s to reverse the strip head to the middle of the parallel section of the No. 1 side guide plate 1SG.

[0021] 3) Set the position roll gap and cold coiling speed. Select coiler No. 1 for cold coiling and set the position roll gap. Set the position opening of side guide plate 1SG to strip width W + 20mm. Lower front pressure roller 1HDR to strip thickness H + 20mm. Lower pinch roller 1PR to strip thickness H + 0.5mm. Open the gate 120mm, and the distance between the gate and the upper pinch roller is less than strip thickness H. Lower the guide roller to strip thickness H * 6mm (pressure control is applied after 6 turns). Close auxiliary coiling roller 1WR to strip thickness H + 2mm. Close auxiliary coiling roller 2WR to strip thickness H + 1.5mm. Close auxiliary coiling roller 3WR to strip thickness H + 1mm. The drum MD is in pre-expanded state at 745mm. The drum support arm is closed. The cold winding speed settings are as follows: the speed of the drum MD and the auxiliary winding roller WR is 2m / s; the speed of pinch roller 1PR and front pressure roller 1HDR is set to 1.98m / s; the speed of rollers G7, G8 and G9 is set to 1.9m / s; the speed of rollers G4, G5 and G6 is set to 1.8m / s; and the speed of rollers G1, G2 and G3 is set to 1.6m / s. The speed difference creates tension cold winding.

[0022] 4) Start cold coiling. After the strip head has wound 2-3 turns on the MD drum, start the MD drum to fully expand. After 6-7 turns of cold coiling tension is established, the No. 2 auxiliary coiling roller WR quickly opens to its maximum position, while the No. 1 and No. 3 auxiliary coiling rollers WR slowly open. For each increase in coil diameter, the amount of strip thickness H opened is maintained, always keeping a 20mm distance from the outermost coil diameter. The guide roller applies pressure to the strip for auxiliary cold coiling. The No. 1 side guide plate 1SG enters the pressure clamp (the auxiliary coiling pressure and clamping pressure increase according to the increase in strip thickness). The uncoiling trolley SCAR rises and slowly descends according to the increase in coil diameter. For each increase in coil diameter, the amount of strip thickness H descended is maintained, always keeping the position controlled at 30mm. The brake shoes are locked in the released state. After the tail end enters the coiler, the cold coiling speed stops. The No. 1 and No. 3 auxiliary coiling rollers remain stationary. The uncoiling trolley SCAR rises and enters pressure control. The jogging drum MD and auxiliary coiling rollers WR rotate forward at a speed of 0.2 m / s to stop the tail end of the strip at the 5 o'clock position of the coiler. The brake shoes of the uncoiling trolley SCAR are locked and switched to position control. The guide roller, No. 1 and No. 3 auxiliary coiling rollers open to their maximum positions. The drum retracts to 727 mm. The jogging drum reverses at a speed of 0.1 m / s to confirm that the head end of the strip separates from the drum. Then, uncoiling is performed to complete the cold coiling.

[0023] This invention is not limited to the above-described embodiments. Anyone should know that any structural changes made under the guidance of this invention, and any technical solutions that are the same as or similar to this invention, fall within the protection scope of this invention.

[0024] The technologies, shapes, and structures not described in detail in this invention are all known technologies.

Claims

1. A method for cold coiling in a hot-rolled coiler, characterized in that, Includes the following steps: 1) When the strip head reaches the laminar flow G8 roller table, it is detected that the coiler does not have normal coiling conditions. The coiler is started to stop quickly. The No. 1 pinch roll, No. 2 pinch roll and No. 3 pinch roll of the coiler rise to the highest position and the valve closes to the lowest position. The strip head will enter the coil catcher by inertial buffer. The laminar flow roller table is arranged in the order of G1 roller table, G2 roller table, G3 roller table, G4 roller table, G5 roller table, G6 roller table, G7 roller table, G8 roller table and G9 roller table. 2) Lower the No. 1 pinch roll until it contacts the strip and the pressure is displayed. Adjust the pressure according to the actual situation. The machine roller conveyor, G9 roller conveyor and 3 pinch rolls reverse at a speed of 1m / s to transport the strip head to the middle of the parallel section of the No. 1 side guide plate. 3) Set the position roll gap and cold rolling speed. Select coiler No. 1 for cold rolling. Set the position roll gap. Set the opening of side guide plate No. 1 to strip width W + 20mm. Lower front pressure roller No. 1 to strip thickness H + 20mm. Lower pinch roller No. 1 to strip thickness H + 0.5mm. Open the gate 120mm. The distance between the gate and the upper pinch roller is less than strip thickness H. Lower the guide roller to strip thickness H + 6mm. Close auxiliary coiling roller No. 1 to strip thickness H + 2mm. Close auxiliary coiling roller No. 2 to strip thickness H + 1.5mm. Close auxiliary coiling roller No. 3 to strip thickness H + 1mm. The drum is in a pre-expanded state of 745mm. Close the drum support arm. Set the cold rolling speed from high to low according to a certain speed difference. The speed difference forms tension cold rolling. 4) Start cold coiling. After the strip head has wound 2-3 turns on the drum, start the drum to fully expand. After 6-7 turns and the cold coil tension is established, the No. 2 auxiliary coiling roller quickly opens to its maximum position, while the No. 1 and No. 3 auxiliary coiling rollers slowly open. For each increase in coil diameter, the strip thickness H is opened, always maintaining a 20mm distance from the outermost coil diameter. The guide roller applies pressure to the strip for auxiliary cold coiling. The No. 1 side guide plate enters the pressure clamping position, and the unloading trolley rises and slowly descends according to the increase in coil diameter. For each increase in coil diameter, the strip thickness H is lowered, always maintaining a 30mm position control. With the brake shoes locked in the released state, the cold coiling speed stops after the tail section enters the coiler. The No. 1 and No. 3 auxiliary coiling rollers remain stationary. The uncoiling trolley rises and enters pressure control. The drum and auxiliary coiling rollers are jogged to rotate forward at a speed of 0.2 m / s to stop the tail section of the strip at the 5 o'clock position on the coiler. The brake shoes of the uncoiling trolley are locked and switched to position control. The guide roller, No. 1 auxiliary coiling roller, and No. 3 auxiliary coiling roller are opened to their maximum positions. The drum retracts to 727 mm. The drum is jogged to rotate in reverse at a speed of 0.1 m / s to confirm that the head section of the strip is separated from the drum. Then, uncoiling is performed to complete the cold coiling.

2. The method for cold coiling in a hot-rolled coiler according to claim 1, characterized in that, The cold winding speed is set as follows: the speed of the drum and the auxiliary winding roller is 2 m / s; the speed of the No. 1 pinch roller and the No. 1 front pressure roller is set to 1.98 m / s; the speed of the G7 roller conveyor, the G8 roller conveyor, and the G9 roller conveyor is set to 1.9 m / s; the speed of the G4 roller conveyor, the G5 roller conveyor, and the G6 roller conveyor is set to 1.8 m / s; and the speed of the G1 roller conveyor, the G2 roller conveyor, and the G3 roller conveyor is set to 1.6 m / s.

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