CN111570530A - Control method for pinch roll before fully-continuous hot-rolling thin strip coil - Google Patents
Control method for pinch roll before fully-continuous hot-rolling thin strip coil Download PDFInfo
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- CN111570530A CN111570530A CN202010442009.3A CN202010442009A CN111570530A CN 111570530 A CN111570530 A CN 111570530A CN 202010442009 A CN202010442009 A CN 202010442009A CN 111570530 A CN111570530 A CN 111570530A
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- pinch roll
- roll
- coiling machine
- flying shear
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0007—Cutting or shearing the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B2015/0057—Coiling the rolled product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2201/00—Special rolling modes
- B21B2201/06—Thermomechanical rolling
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Abstract
The invention relates to the field of automatic control of steel rolling, and provides a control method of a pinch roll in front of a fully-continuous hot-rolled thin strip coil, which comprises the following steps: step 1: the waste material enters a waste hopper for preparation. Step 2: when the head of the strip steel tracks in place, the No. 2 lower pinch roll is driven to a rolling position, and the No. 2 upper pinch roll is swung to an initial roll gap. And step 3: after the 2# coiling machine builds tension, the 2# upper pinch roll is switched to pressure closed-loop control, and the 1# lower pinch roll is driven to a rolling position; after the coil weight of the 2# coiling machine reaches, the flying shear shears the coil weight, the 1# upper pinch roll swings to the initial roll gap, and the 2# upper pinch roll is switched to position closed-loop control and swings to the initial roll gap; after the tension of the 1# coiling machine is built, the 1# upper pinch roll is switched to be in pressure closed-loop control, and the 1# lower pinch roll is switched to be in a switching position. And 4, step 4: and after the coil weight of the 1# recoiling machine reaches, the flying shear cuts, and the 1# upper pinch roll is switched to position closed-loop control and swings to a large roll gap. And (5) rotating the rolling mill in the continuous rolling process to step 2. The invention can improve the control precision of the pinch roll before rolling and ensure the stability of rolling type and high-speed switching.
Description
Technical Field
The invention relates to the technical field of steel rolling automatic control, in particular to a control method of a pinch roll in front of a fully-continuous hot-rolled thin strip coil.
Background
In a fully continuous hot rolling thin strip production line, the upper pinch roll and the lower pinch roll before rolling play an important role: when the strip steel penetrates into the coiling machine, the upper pinch roll is used for stably taking the strip steel into the coiling machine so as to be coiled smoothly; providing tension between a coiling machine and a pinch roll when the rolling mill throws steel; when the recoiling machine performs coil separation, the upper pinch roll and the lower pinch roll act in a matching way to ensure that the strip steel is smoothly switched to the recoiling machine. In the existing method for controlling the pinch roll before the coil, a pneumatic valve is arranged behind the pinch roll, the pneumatic valve is used for controlling and selecting the steel coil recoiling machine, the action speed of the pneumatic valve is slow, and after the flying shear cuts the steel coil, the high-speed switching requirement cannot be met in the switching process of two recoiling machines.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a control method of a front pinch roll of a fully continuous hot-rolled thin strip coil, which can improve the control precision of the front pinch roll, ensure the stability of coil type and high-speed switching, and is simple and practical.
The technical scheme of the invention is as follows:
a control method for a pinch roll before a fully continuous hot rolling thin strip coil is characterized by comprising the following steps:
step 1: preparation of waste into waste hopper
Step 1.1: opening the roll gap of the No. 1 upper pinch roll to a large roll gap;
step 1.2: the No. 1 lower pinch roll is controlled to be switched to a switching position through a hydraulic cylinder position ring;
step 1.3: opening the roll gap of the No. 2 upper pinch roll to a large roll gap;
step 1.4: switching the No. 2 lower pinch roll to a switching position;
step 1.5: accelerating all roller ways to 2-4 times of the speed of the strip steel after flying shearing;
the fully-continuous hot-rolled thin strip line comprises two underground recoiling machines, wherein the two underground recoiling machines comprise a 1# recoiling machine and a 2# recoiling machine, and equipment on the machine sequentially comprises a rolling mill, a first guide plate, a flying shear, a 1# pinch roll, a second guide plate, a 2# pinch roll and a waste hopper; the 1# pinch roll is arranged on the inlet side of the 1# coiler, and the 2# pinch roll is arranged on the inlet side of the 2# coiler; the No. 1 pinch roll comprises a No. 1 upper pinch roll and a No. 1 lower pinch roll, and the No. 2 pinch roll comprises a No. 2 upper pinch roll and a No. 2 lower pinch roll; each upper pinch roll is driven by 2 hydraulic cylinders to swing, and each lower pinch roll is driven by 2 hydraulic cylinders to move; the large roll gap is a roll gap larger than the thickness of the strip steel;
step 2: after the waste material enters the waste hopper, the 2# coiling machine coil steel is prepared
When first coil steel is rolled, the head of the strip steel reaches the flying shear position through the rolling mill, the flying shear cuts the head according to the set head cutting length, the start of tracking the head position of the strip steel is started according to a cutting completion signal, when the tracking position reaches the position S0, the speed of all roller ways after the flying shear is changed into a normal advance speed, the 2# lower pinch roll is positioned to the rolling position from the switching position, and after the 2# lower pinch roll is positioned, the 2# upper pinch roll is pressed and swung to the initial roll gap;
when non-first coil steel is rolled, a 1# coiling machine is coiling the steel, if the coil weight of the 1# coiling machine reaches a set coil weight, a flying shear starts to shear, after the flying shear finishes shearing, the start of tracking the head position of the strip steel is started according to a shearing finishing signal, when the tracking position reaches an S0 position, the speed of all roller ways after the flying shear is changed into a normal advance speed, a 2# lower pinch roll is positioned to a rolling position from a switching position, and after the positioning of a 2# lower pinch roll is finished, a 2# upper pinch roll is pressed and swung to an initial roll gap;
the method comprises the following steps of S0, wherein the operation time sequence of the 2# upper pinch roll and the 2# lower pinch roll can be completed by taking a flying shear as a reference, S0 is S1- (T1+ T2) V, S1 is the distance between the flying shear and the 2# pinch roll, V is the strip steel speed, T1 is the traversing time of the 2# lower pinch roll, and T2 is the time for the 2# upper pinch roll to fall and be positioned to the initial roll gap from the large roll gap; the initial roll gap is 0.92-0.98 times of the thickness of the strip steel; the normal advance speed is 1.05-1.1 times of the speed of the strip steel;
and step 3: switching to No. 1 coiler coil steel
Step 3.1: after the 2# coiling machine builds a sheet or after the tracking position of the head of the strip steel taking the flying shear shearing completion signal in the step 2 as the starting signal reaches a set threshold value, the 2# upper pinch roll is switched to pressure closed-loop control from position closed-loop control;
step 3.2: after the No. 2 coiler builds a piece, the No. 1 lower pinch roll is positioned to a rolling position from a switching position;
step 3.3: after the calculated coil weight of the 2# coiling machine reaches a set coil weight threshold value, the flying shear performs shearing, after the shearing of the flying shear is completed, a winding drum of the 2# coiling machine accelerates, and when the tail tracking position of the strip steel in the 2# coiling machine passes through the position of a 1# pinch roll during the acceleration of the winding drum, the 1# upper pinch roll is pressed downwards and is positioned to an initial roll gap;
step 3.4: after the flying shear is cut, when the heat detection is carried out before the pinch roll of the 2# coiling machine, the pressure closed-loop control of the 2# upper pinch roll is switched into the position closed-loop control, and meanwhile, the 2# upper pinch roll is positioned to the initial roll gap;
step 3.5: after the 1# coiling machine builds a sheet or after the tracking position of the head of the strip steel taking the flying shear shearing completion signal in the step 3.3 as the starting signal reaches a set threshold value, the 1# upper pinch roll is switched to pressure closed-loop control;
step 3.6: after the 1# coiling machine builds a piece and the 1# upper pinch roll is switched to pressure closed-loop control, the 1# lower pinch roll is switched to a switching position;
and 4, step 4: switching to 2# coiling machine coil steel
Step 4.1: when the calculated volume weight of the 1# coiling machine reaches a set volume weight threshold value, cutting and coiling by using flying shears;
step 4.2: after the flying shear finishes shearing, a winding drum of a 1# coiling machine accelerates, when the tracking position of the tail part of the strip steel passes through the position of a 1# pinch roll, the pressure closed-loop control of the 1# upper pinch roll is converted into position closed-loop control, and the 1# upper pinch roll is positioned to a large roll gap;
and 5: if the rolling mill is used for continuous rolling, turning to the step 2; and (4) if the rolling mill has no steel and the heat detection signals on the rolling line are completely disappeared, turning to the step 1.
The invention has the beneficial effects that:
according to the invention, the two hydraulic cylinders are arranged on the lower pinch roll to drive the lower pinch roll to move, so that the lower pinch roll can quickly respond through the hydraulic system; in the invention, the first piece of steel is cut and sent into a waste hopper in an accelerated manner before entering a coiler, and time is won for the actions of an upper pinch roll and a lower pinch roll in front of a 2# coiler; after the upper pinch roll and the lower pinch roll in front of the 2# coiler successfully finish the action, the strip steel enters the 2# coiler, when the weight of a steel coil in the 2# coiler reaches a set coil weight H2, the automatic shearing function of a flying shear is started, and the head of the sheared new strip steel enters the 1# coiler to be coiled; before switching to the No. 1 coiler, the front lower pinch roll of the No. 1 coiler is driven to a rolling position in advance, the strip steel enters the front No. 1 upper pinch roll of the No. 1 coiler and is swung well, when the weight of the steel coil in the 1# coiling machine reaches the set coil weight H1, the flying shear automatic shearing function is started, the head of the sheared new strip steel enters the 2# coiling machine for coiling, the two coiling machines are switched to coil the steel, by accurately controlling the actions of the pinch roll before coiling, the actions of the pinch roll can meet the requirement of switching actions when the waste material passes through the pinch roll of any 1 coiling machine, the upper pinch roll and the lower pinch roll can quickly and accurately cooperate to act when the coiling machine is coiled so as to ensure that the strip steel is smoothly switched to the coiling machine, the stability of coiling type and high-speed switching can be ensured, the method is simple and practical, and can solve the technical problem that the high-speed switching requirement cannot be met due to the fact that the recoiling machine is controlled and selected through the pneumatic valve in the existing method for controlling the pinch roll before the coil.
Drawings
FIG. 1 is a schematic diagram of a fully continuous hot rolled thin strip line according to one embodiment.
FIG. 2 is a flow chart of a method of controlling pinch rolls before a fully continuous hot rolled thin strip coil in accordance with the present invention.
In the figure, a 1-rolling mill, a 2-1# guide plate, a 3-flying shear, a 4-1 # pinch roll, a 4-1-1 # upper pinch roll, a 4-2-1 # lower pinch roll, a 5-2 # guide plate, a 6-2 # pinch roll, a 6-1-2 # upper pinch roll, a 6-2-2 # lower pinch roll, a 7-waste hopper, an 8-1 # coiling machine, an 8-1-1-1 # wrapper roll, an 8-2-1-2 # wrapper roll, an 8-3-1-3 # wrapper roll, an 8-4-1-4 # wrapper roll, an 8-5-1 # winding drum, a 9-2 # coiling machine, a 9-1-2-1 # wrapper roll, a 9-2-2-2 # wrapper roll, a 9-3-2-3 # wrapper roll, a 9-4-2-4 # winding roll, a 9-5-2 # winding drum, 10-1 # thermal scan spot, 11-2 # thermal scan spot.
Detailed Description
The invention will be further described with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic structural diagram of a fully continuous hot-rolled thin strip line in a steel mill according to this embodiment. The rolling line comprises two underground recoiling machines, namely a # 1 recoiling machine 8 and a # 2 recoiling machine 9, wherein the on-machine equipment comprises a rolling mill 1, a # 1 guide plate 2, a flying shear 3, a # 1 pinch roll 4 (comprising a # 1 upper pinch roll 4-1 and a # 1 lower pinch roll 4-2), a # 2 guide plate 5, a # 2 pinch roll 6 (comprising a # 2 upper pinch roll 6-1 and a # 2 lower pinch roll 6-2), an on-machine roller way, a waste roller way and a waste hopper 7 in sequence. The 1# coiling machine 8 comprises a 1-1# coiling roller 8-1, a 1-2# coiling roller 8-2, a 1-3# coiling roller 8-3, a 1-4# coiling roller 8-4 and a 1# winding drum 8-5; the 2# coiling machine 9 comprises a 2-1# coiling roller 9-1, a 2-2# coiling roller 9-2, a 2-3# coiling roller 9-3, a 2-4# coiling roller 9-4 and a 2# winding drum 9-5. A1 # thermal scanning point 10 and a 2# thermal scanning point 11 are respectively arranged before the 1# pinch roller 4 and the 2# pinch roller 6.
The front pinch roll of the coiling machine is arranged on the inlet side of the underground coiling machine, the 1# pinch roll 4 is arranged on the inlet side of a 1# coiling machine 8, the 2# pinch roll 6 is arranged on the inlet side of a 2# coiling machine 9, the head of the steel plate is led into the underground coiling machine, and meanwhile tension is applied to the coiled plate after the coiled plate is sheared.
The upper pinch roll and the lower pinch roll are both driven by a motor through a speed reducer and a universal spindle; the upper pinch roll is driven by 2 hydraulic cylinders to swing; the lower pinch roll is driven by 2 hydraulic cylinders to move. The hydraulic cylinder adopts a hydraulic cylinder without a memorial archway, and a magnetic ruler is arranged in the hydraulic cylinder.
The roll gap between the upper pinch roll and the lower pinch roll is set according to the thickness of the band steel and regulated by a hydraulic control oil cylinder, the hydraulic cylinder is set on the pinch roll frame and the swing arm, the stroke is controlled by a combined position sensor, and the sensor and the hydraulic cylinder are assembled to integrally supply the band steel.
The upper pinch roll is lifted and lowered by two hydraulic cylinders, the clamping force between the upper pinch roll and the lower pinch roll is adjustable according to different strip steel thicknesses, and roll gaps for pinching and conveying steel plates with different thicknesses are set by the hydraulic cylinders. The upper pinch roll is balanced by adopting a spring cylinder, and meanwhile, the bearing clearance can be eliminated. The upper pinch roll adopts a welded hollow roll body, and the roll surface is made of wear-resistant hard alloy by surfacing welding. Two ends of the roller are provided with double-row self-aligning rolling bearings to bear tension, and the bearing seat is fixed on the rocker arm by bolts.
The lower pinch roll is fixed. The roller body is a solid roller, and the roller surface is made of wear-resistant hard alloy by surfacing welding. Two ends of the roller are provided with double-row self-aligning rolling bearings to bear tension, and the bearing seat is fixed on the frame by bolts.
The frame is a steel plate welding structure, the frame pieces on the transmission side and the operation side are made of thick steel plates, the two frames are connected by a cross beam, and the surface of the pinch roll is provided with a wear-resistant lining plate.
The upper pinch roll and the lower pinch roll are respectively controlled by two servo valves before rolling, control logic is realized by a rod cavity, a rodless cavity pressure sensor and magnetic rulers at two sides respectively, and the related technical data of a pair of upper pinch roll and lower pinch roll are as follows:
the size of the upper pinch roll is as follows: phi 900x1500mm
The size of the lower pinch roll is as follows: phi 500x1500mm
Roll surface linear velocity: max.5m/s
An upper roller oscillating cylinder: phi 180/phi 125x580, 16MPa, 200mm/s, 2 stations (one for each of transmission side and operation side)
The lower roll moves transversely the cylinder: phi 125/phi 90x280, 16MPa, 50mm/s, 2 stations (one for each of transmission side and operation side)
The lower roller compresses the cylinder: phi 125/phi 100x20, 16MPa, 10mm/s, 2 stations (one for each of transmission side and operation side)
A transmission motor: AC150kW, 0 ~ 1000 ~ 1730rpm, 380V, 2 tables (one upper and one lower roller respectively)
Pinch roll hydraulic cylinder servo valve: MOOG D661 with feedback, input of + -10 mA and output of 4-20mA
Pinch roll displacement sensor: MTS RHM0630MP101S1G5100 magnetic ring: 201542
The model of each electrical device is shown in table 1:
TABLE 1
In this embodiment, the PLC is configured according to the site requirement, and 2 sets of SIMATIC TDC and 1 set of S7-400PLC from siemens corporation are used in common:
1) the screw-down control system adopts a Siemens high-performance TDC system and comprises 2 CPUs 551 and is mainly used for completing screw-down position closed-loop control, stepping and short-stroke control and the like of a winding drum, a wrapper roller, a pinch roller and the like in a winding area.
The main frame comprises the following templates:
RACK: TDC frame
A CPU: central processing unit
CP51M 1: industrial Ethernet communication module
CP50M 1: PROFIBUS-DP network communication module
SM 500: input/output module
ET-200M remote station:
PS 307: frame power supply template
The IM 153: bus interface unit
DI: switching value input template
DO: switching value output template
2) The master control system adopts Siemens S7-400 series PLC, and the CPU414-2 mainly completes logic control of tension of a coiling area, master speed including pinch rolls, coil diameter calculation, communication linkage among all auxiliary stations and the like.
The main frame comprises the following templates:
PS: power supply template
A CPU: central processing unit
TCP: industrial Ethernet communication module
FM 450-1: incremental pulse input module
ET-200M: remote station
PS 307: frame power supply template
The IM 153: bus interface unit
SM 338: absolute value pulse input template
FM 350-2: incremental encoder input template
AI: analog input template
AO: analog quantity output template
DI: switching value input template
DO: switching value output template
According to the invention, the two hydraulic cylinders are arranged on the lower pinch roll to drive the lower pinch roll to move, so that the lower pinch roll can quickly respond through a hydraulic system. In the fully continuous hot rolling thin strip line, strip steel passing through a rolling mill can enter a 1# coiling machine for automatic coiling, and can also enter a 2# coiling machine for automatic coiling. According to the process requirements, after the head of the strip steel passes through a rolling mill, because the head of the strip steel is unstable, the thickness of the head of the strip steel is uneven, the plate type of the head of the strip steel is difficult to control, a flying shear cutting head is required to be selected, the waste materials after cutting are conveyed into a waste hopper, a new head of the strip steel before entering a coiler is a first head of the strip steel, because the distance between the flying shear and a 1# coiler is shorter than that between the flying shear and a 2# coiler, the switching time of a 1# lower pinch roll cannot meet the time that the conveyed waste materials and the head of the first strip steel entering the 1# coiler are pulled apart for a certain distance, namely the first piece of steel cannot successfully enter the 1# coiler, and the first piece of steel must enter the 2# coiler for coiling. When the 2# coiling machine is coiling steel and the calculated steel coil weight exceeds the set coil weight H2, starting the flying shear automatic shearing function, and feeding the head of the sheared new strip steel into the 1# coiling machine for coiling; when the weight of the steel coil in the 1# coiling machine reaches the set coil weight H1, the flying shear automatic shearing function is started, the head of the sheared new strip steel enters the 2# coiling machine to be coiled, and the like, and the two coiling machines switch the steel coil. In order to ensure the stability of roll shape and switching, the control of the pinch roll before rolling in the fully continuous hot rolling thin strip line of the invention needs to meet the following requirements: the first piece of steel must be cut to pass before entering the coiler, and the first piece of steel must enter the 2# coiler to coil the steel, so that the waste materials after cutting must be rapidly sent to a waste hopper, time is strived for the action of the upper pinch roll and the lower pinch roll in front of the 2# coiler, and the strip steel can enter the 2# coiler only after the action of the upper pinch roll and the lower pinch roll in front of the 2# coiler is successfully completed; before switching to the No. 1 coiler, the lower pinch roll in front of the No. 1 coiler must be driven to a rolling position in advance, and the upper pinch roll in front of the strip steel entering the No. 1 coiler must be arranged in a well-positioned mode. Therefore, when the waste material passes through the pinch rolls of any 1 coiling machine, the pinch roll action needs to meet the requirement of switching action; when the recoiling machine performs coil splitting, the upper pinch roll and the lower pinch roll need to be quickly and accurately matched to move so as to ensure that the strip steel is smoothly switched to the recoiling machine, and the action sequence of the pinch rolls plays a vital role.
In this embodiment, as shown in fig. 2, the method of the present invention is used to control the pinch roll before the fully-continuous hot-rolled thin strip coil in the steel mill, and specifically includes the following steps:
step 1: preparation of waste into waste hopper
Step 1.1: opening the roll gap of the No. 1 upper pinch roll to a large roll gap;
step 1.2: the No. 1 lower pinch roll is controlled to be switched to a switching position through a hydraulic cylinder position ring;
step 1.3: opening the roll gap of the No. 2 upper pinch roll to a large roll gap;
step 1.4: switching the No. 2 lower pinch roll to a switching position;
step 1.5: accelerating all roller ways to 2-4 times of the speed of the strip steel after flying shearing;
wherein the large roll gap is a roll gap larger than the thickness of the strip steel. In this example, the large roll gap was 90 mm.
Before strip steel passes through a rolling mill, the strip steel enters a 2# coiling machine through a 1# pinch roll, a 1# upper pinch roll is required to be opened to a roll gap larger than the thickness of the strip steel, and a 1# lower pinch roll needs to be transversely moved to a switching position, so that the head of the strip steel and cut waste can be ensured to smoothly pass through the 1# pinch roll. After the strip steel is cut at the head by the flying shear, in order to smoothly bring the waste materials after the head is cut into a waste hopper, all roller ways are accelerated to be 2-4 times of the speed of the strip steel after the flying shear, meanwhile, the 2# upper pinch roll needs to be opened to a roll gap larger than the thickness of the strip steel, and the 2# lower pinch roll is switched to a switching position.
Step 2: after the waste material enters the waste hopper, the 2# coiling machine coil steel is prepared
When first coil steel is rolled, the head of the strip steel reaches the flying shear position through the rolling mill, the flying shear cuts the head according to the set head cutting length, the start of tracking the head position of the strip steel is started according to a cutting completion signal, when the tracking position reaches the position S0, the speed of all roller ways after the flying shear is changed into a normal advance speed, the 2# lower pinch roll is positioned to the rolling position from the switching position, and after the 2# lower pinch roll is positioned, the 2# upper pinch roll is pressed and swung to the initial roll gap;
when non-first coil steel is rolled, a 1# coiling machine is coiling the steel, if the coil weight of the 1# coiling machine reaches a set coil weight, automatic shearing by a flying shear is started, after the shearing by the flying shear is finished, the start of tracking the head position of the strip steel is started according to a shearing finishing signal, when the tracking position reaches the position S0, the speed of all roller ways after the flying shear is changed into a normal advance speed, a 2# lower pinch roll is positioned to a rolling position from a switching position, and after the positioning of a 2# lower pinch roll is finished, a 2# upper pinch roll is pressed and swung to an initial roll gap;
the method comprises the following steps of S0, wherein the operation time sequence of the 2# upper pinch roll and the 2# lower pinch roll can be completed by taking a flying shear as a reference, S0 is S1- (T1+ T2) V, S1 is the distance between the flying shear and the 2# pinch roll, V is the strip steel speed, T1 is the traversing time of the 2# lower pinch roll, and T2 is the time for the 2# upper pinch roll to fall and be positioned to the initial roll gap from the large roll gap; the initial roll gap is 0.92-0.98 times of the thickness of the strip steel; the normal advance speed is 1.05-1.1 times of the speed of the strip steel.
And step 3: switching to No. 1 coiler coil steel
Step 3.1: and after the 2# coiling machine builds tension, the tension building signal is used as a starting signal to control the 2# upper pinch roll to be switched from position closed-loop control to pressure closed-loop control. In addition, the condition that the 2# upper pinch roll is switched to the pressure closed-loop control can be that the tracking position of the strip head with the flying shear cutting completion signal in the step 2 as the starting signal reaches the set threshold.
Step 3.2: after the tension of the No. 2 coiler is built, the No. 1 lower pinch roll is positioned to a rolling position from a switching position.
Step 3.3: and after the calculated coil weight of the 2# coiling machine reaches a set coil weight threshold value, the flying shear performs shearing, after the shearing of the flying shear is completed, a winding drum of the 2# coiling machine accelerates, and when the tail tracking position of the strip steel in the 2# coiling machine passes through the position of the 1# pinch roll during the acceleration of the winding drum, the 1# upper pinch roll is pressed downwards and is positioned to an initial roll gap.
Step 3.4: after the flying shear is cut, when the heat detection is carried out before the pinch roll of the 2# coiler, the pressure closed-loop control is switched to the position closed-loop control to control the upper pinch roll of the 2# coiler, and meanwhile, the upper pinch roll of the 2# coiler is positioned to the initial roll gap.
Step 3.5: after the head of the strip steel smoothly enters the No. 1 coiling machine and the No. 1 coiling machine is expanded, in order to ensure that the coiling and uncoiling time is sufficient, the No. 1 upper pinch roll is switched to pressure closed-loop control to be tightly attached above the roll surface of the No. 1 lower pinch roll, so that the strip steel between the pinch roll and the coiling machine is always in tension, and the coiling quality is improved. In addition, the condition that the 1# upper pinch roll is switched to the pressure closed-loop control can be that the tracking position of the strip head with the flying shear shearing completion signal in the step 3.3 as the starting signal reaches the set threshold.
Step 3.6: and after the 1# coiling machine builds tension and the 1# upper pinch roll is switched to pressure closed-loop control, the 1# lower pinch roll is switched to a switching position.
And 4, step 4: switching to 2# coiling machine coil steel
Step 4.1: when the calculated volume weight of the 1# coiling machine reaches a set volume weight threshold value, the flying shear starts to split the coil;
step 4.2: after the flying shears cut, in order to separate the distance of the cut strip steel, a winding drum of a 1# coiling machine accelerates, the time for starting the tracking of the tail of the strip steel is taken when the cutting edge of the flying shears is vertical to the strip steel, when the tracking position of the tail of the strip steel passes through the position of a 1# pinch roll, the pressure closed-loop control of the 1# upper pinch roll is converted into the position closed-loop control, and the 1# upper pinch roll is swung to a large roll gap.
And 5: if the rolling mill rolls continuously, turning to the step 2, and circularly performing automatic control; and (4) if the rolling mill has no steel and the heat detection signals on the rolling line are completely disappeared, turning to the step 1.
According to the invention, through the accurate control of the actions of the two pairs of front pinch rolls, the actions of the pinch rolls can meet the switching action requirement when the waste material passes through the pinch rolls of any 1 recoiling machine, the upper pinch roll and the lower pinch roll can quickly and accurately cooperate to act when the recoiling machine performs coil splitting so as to ensure that the strip steel is smoothly switched over the recoiling machine, the stability of coil type and high-speed switching is ensured, and the technical problem that the recoiling machine cannot meet the high-speed switching requirement due to the fact that the recoiling machine is controlled and selected through a pneumatic valve in the existing control method of the front pinch rolls is solved.
It is to be understood that the above-described embodiments are only a few embodiments of the present invention, and not all embodiments. The above examples are only for explaining the present invention and do not constitute a limitation to the scope of protection of the present invention. All other embodiments, which can be derived by those skilled in the art from the above-described embodiments without any creative effort, namely all modifications, equivalents, improvements and the like made within the spirit and principle of the present application, fall within the protection scope of the present invention claimed.
Claims (1)
1. A control method for a pinch roll before a fully continuous hot rolling thin strip coil is characterized by comprising the following steps:
step 1: preparation of waste into waste hopper
Step 1.1: opening the roll gap of the No. 1 upper pinch roll to a large roll gap;
step 1.2: the No. 1 lower pinch roll is controlled to be switched to a switching position through a hydraulic cylinder position ring;
step 1.3: opening the roll gap of the No. 2 upper pinch roll to a large roll gap;
step 1.4: switching the No. 2 lower pinch roll to a switching position;
step 1.5: accelerating all roller ways to 2-4 times of the speed of the strip steel after flying shearing;
the fully-continuous hot-rolled thin strip line comprises two underground recoiling machines, wherein the two underground recoiling machines comprise a 1# recoiling machine and a 2# recoiling machine, and equipment on the recoiling machines sequentially comprises a rolling mill, a 1# guide plate, a flying shear, a 1# pinch roll, a 2# guide plate, a 2# pinch roll and a waste hopper; the 1# pinch roll is arranged on the inlet side of the 1# coiler, and the 2# pinch roll is arranged on the inlet side of the 2# coiler; the No. 1 pinch roll comprises a No. 1 upper pinch roll and a No. 1 lower pinch roll, and the No. 2 pinch roll comprises a No. 2 upper pinch roll and a No. 2 lower pinch roll; each upper pinch roll is driven by 2 hydraulic cylinders to swing, and each lower pinch roll is driven by 2 hydraulic cylinders to move; the large roll gap is a roll gap larger than the thickness of the strip steel;
step 2: after the waste material enters the waste hopper, the 2# coiling machine coil steel is prepared
When first coil steel is rolled, the head of the strip steel reaches the flying shear position through the rolling mill, the flying shear cuts the head according to the set head cutting length, the start of tracking the head position of the strip steel is started according to a cutting completion signal, when the tracking position reaches the position S0, the speed of all roller ways after the flying shear is changed into a normal advance speed, the 2# lower pinch roll is positioned to the rolling position from the switching position, and after the 2# lower pinch roll is positioned, the 2# upper pinch roll is pressed and swung to the initial roll gap;
when non-first coil steel is rolled, a 1# coiling machine is coiling the steel, if the coil weight of the 1# coiling machine reaches a set coil weight, a flying shear starts to shear, after the flying shear finishes shearing, the start of tracking the head position of the strip steel is started according to a shearing finishing signal, when the tracking position reaches an S0 position, the speed of all roller ways after the flying shear is changed into a normal advance speed, a 2# lower pinch roll is positioned to a rolling position from a switching position, and after the positioning of a 2# lower pinch roll is finished, a 2# upper pinch roll is pressed and swung to an initial roll gap;
the method comprises the following steps of S0, wherein the operation time sequence of the 2# upper pinch roll and the 2# lower pinch roll can be completed by taking a flying shear as a reference, S0 is S1- (T1+ T2) V, S1 is the distance between the flying shear and the 2# pinch roll, V is the strip steel speed, T1 is the traversing time of the 2# lower pinch roll, and T2 is the time for the 2# upper pinch roll to fall and be positioned to the initial roll gap from the large roll gap; the initial roll gap is 0.92-0.98 times of the thickness of the strip steel; the normal advance speed is 1.05-1.1 times of the speed of the strip steel;
and step 3: switching to No. 1 coiler coil steel
Step 3.1: after the 2# coiling machine builds a sheet or after the tracking position of the head of the strip steel taking the flying shear shearing completion signal in the step 2 as the starting signal reaches a set threshold value, the 2# upper pinch roll is switched to pressure closed-loop control from position closed-loop control;
step 3.2: after the No. 2 coiler builds a piece, the No. 1 lower pinch roll is positioned to a rolling position from a switching position;
step 3.3: after the calculated coil weight of the 2# coiling machine reaches a set coil weight threshold value, the flying shear performs shearing, after the shearing of the flying shear is completed, a winding drum of the 2# coiling machine accelerates, and when the tail tracking position of the strip steel in the 2# coiling machine passes through the position of a 1# pinch roll during the acceleration of the winding drum, the 1# upper pinch roll is pressed downwards and is positioned to an initial roll gap;
step 3.4: after the flying shear is cut, when the heat detection is carried out before the pinch roll of the 2# coiling machine, the pressure closed-loop control of the 2# upper pinch roll is switched into the position closed-loop control, and meanwhile, the 2# upper pinch roll is positioned to the initial roll gap;
step 3.5: after the 1# coiling machine builds a sheet or after the tracking position of the head of the strip steel taking the flying shear shearing completion signal in the step 3.3 as the starting signal reaches a set threshold value, the 1# upper pinch roll is switched to pressure closed-loop control;
step 3.6: after the 1# coiling machine builds a piece and the 1# upper pinch roll is switched to pressure closed-loop control, the 1# lower pinch roll is switched to a switching position;
and 4, step 4: switching to 2# coiling machine coil steel
Step 4.1: when the calculated volume weight of the 1# coiling machine reaches a set volume weight threshold value, cutting and coiling by using flying shears;
step 4.2: after the flying shear finishes shearing, a winding drum of a 1# coiling machine accelerates, when the tracking position of the tail part of the strip steel passes through the position of a 1# pinch roll, the pressure closed-loop control of the 1# upper pinch roll is converted into position closed-loop control, and the 1# upper pinch roll is positioned to a large roll gap;
and 5: if the rolling mill is used for continuous rolling, turning to the step 2; and (4) if the rolling mill has no steel and the heat detection signals on the rolling line are completely disappeared, turning to the step 1.
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