Method for controlling the opening roll gap of an intermediate steel coil in a hot coil box

Abstract

This invention relates to a method for controlling the uncoiling roll gap of intermediate billet steel coils in a hot-rolling box, belonging to the field of uncoiling technology for producing metal strips using non-rolling methods. The method first determines the target value range G of the uncoiling roll gap based on the thickness of the intermediate billet in the specific hot-rolling box. Then, based on the fixed coordinate value of the C roll, the target longitudinal coordinate range of the center point E of the large idler roll can be calculated. When the shovel head contacts the intermediate billet steel coil for uncoiling, the γ and β values ​​are read in real time by angle sensors at points D and O. The real-time longitudinal coordinate value of the center point E of the large idler roll is calculated. By comparing whether the real-time longitudinal coordinate value of point E falls within the target longitudinal coordinate range of point E, it can be determined whether the uncoiling roll gap falls within the set target value G range, thereby achieving accurate control of the uncoiling roll gap and solving the problem of head knocking during the uncoiling process.

Description

Technical Field

[0001] This invention relates to a method for controlling the gap between uncoiling rolls during the uncoiling process of a hot coil box, belonging to the field of uncoiling technology for producing metal strips using non-rolling methods. Background Technology

[0002] The main function of the hot coil box is to coil the rough-rolled intermediate billet without a mandrel, then uncoil it to transform the tail end of the intermediate billet into the head end and the lower surface into the upper surface, before sending it to the finishing mill for rolling. In practical applications, if the coil shape is too large or too small, or not round, it will cause inaccurate positioning of the shovel, resulting in the uncoiling roll gap (i.e., the roll gap formed between the large idle roll and the uncoiling C roll when the shovel head contacts the intermediate billet) fluctuating in size, thus causing the head to knock or lift up during uncoiling.

[0003] A search revealed a similar patent, CN201210083761.9, entitled "A Hot Coil Uncoiling Device and its Uncoiling Control Method." This patent calculates the stroke parameters of the circular rollers during the uncoiling process based on the specifications and material of the product to be uncoiled. A hydraulic device then controls the circular rollers to perform the corresponding uncoiling action based on these parameters. Finally, an uncoiling shovel completes the uncoiling of the steel coil, thus enabling different uncoiling actions for different product specifications, reducing scratches on the strip surface, and improving the surface quality of hot-rolled products. However, it does not address controlling the gap between the uncoiling rollers during uncoiling to prevent warping. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to control the uncoiling roll gap during the uncoiling of intermediate billet steel coils within a specified target value range, so as to prevent warping during uncoiling.

[0005] The technical solution proposed by this invention to solve the above-mentioned technical problems is: a method for controlling the uncoiling roll gap of intermediate billet steel in a hot coil box, the hot coil box comprising a large swing arm hinged at one end to a gate base, an insert arm hinged at one end to the other end of the large swing arm, and a shovel head hinged to the other end of the insert arm. A hydraulic cylinder is mounted on the large swing arm, the piston rod fork of the hydraulic cylinder is hinged to one end of the insert arm, an angle sensor is provided at one end of the large swing arm, an angle encoder is provided at the hinge point between the large swing arm and the insert arm, and an uncoiling C-roller is provided below the shovel head; the following steps are performed:

[0006] 1) Set the longitudinal axis sectional plane where the hot-rolled coil box and the intermediate billet coil are in the same running direction as the coordinate plane.

[0007] Projecting the hinge point between the insertion arm and the large swing arm of the hot roll box into the coordinate plane forms point D.

[0008] Projecting the hinge point between the large swing arm of the hot roll box and the archway base into the coordinate plane forms point O.

[0009] Projecting the hinge point between the insertion arm of the hot roll box and the large idler roller on the shovel head into the coordinate plane forms point E.

[0010] Projecting the axis of the unwinding roll onto the coordinate plane forms point C.

[0011] 2) Establish a Cartesian coordinate system with point O as the origin in the coordinate plane. Set the cylinder to be in full stroke state. At this time, the three points ODE form a triangle △ODE. The side lengths OD and ED of triangle △ODE are known fixed values. The coordinates of point C are known fixed values, denoted as (XC, YC). The degree measure of the included angle ∠DOE of triangle △ODE is a known fixed value β1. Let the angle between the OD line segment and the vertical coordinate be β and be read in real time by the first angle sensor at the hinge point O. Let the included angle ∠ODE of triangle △ODE be γ and be read in real time by the second angle sensor at the hinge point D.

[0012] 3) Set the target value G of the uncoiling roll gap to a known fixed range of 1.2h ± 2, where h is the thickness h of the intermediate billet coil, and the C roll radius is a known fixed value R. C The radius of the large idler roller on the shovel head is a known fixed value R. E The range of the target ordinate value YE at point E is determined according to the following formula (1). E 1, Y E 2),

[0013] Y E =Y C +R C +G+R E (1);

[0014] 4) When the shovel head contacts the intermediate billet coil to unwind, the two small idler rollers on the shovel head are in close contact with the outer circle of the intermediate billet coil, and the large idler roller on the shovel head is in close contact with the inner circle of the intermediate billet coil. At this time, the angle sensor at point D reads the γ value in real time, and the angle sensor at point O reads the β value in real time. The OE length is calculated in real time according to the following formula (2).

[0015] OE 2 =OD 2 +DE 2 -2*OD*DE*cosγ (2),

[0016] The value of β1 is calculated in real time according to the following formula (3).

[0017] cosβ1=(OE 2 +OD 2 -DE 2 ) / 2*OD*OE (3);

[0018] 5) Then calculate the real-time ordinate value Y of point E according to the following formula (4). E’

[0019] Y E’ =OE*sin(90-β-β1) (4)

[0020] 6) Y E’ With Y E Compare, if Y E’ Not falling into Y E If it is within the range, continue pressing down the shovel head until Y... E’ Falling into Y E Once the blade is within the specified range, stop pressing down on the blade and lock the blade position.

[0021] The beneficial effects of this invention are as follows: First, the target value range G of the uncoiling roll gap is determined based on the thickness of the intermediate billet in the specific hot-rolling box. Then, based on the fixed coordinate value of the C roll, the target longitudinal coordinate range of the center point E of the large idler roll can be calculated. When the shovel head contacts the intermediate billet coil for uncoiling, the γ and β values ​​read in real time by the angle sensors at points D and O are used to calculate the real-time longitudinal coordinate value of the center point E of the large idler roll. By comparing whether the real-time longitudinal coordinate value of point E falls within the target longitudinal coordinate range of point E, it can be determined whether the uncoiling roll gap (the gap formed between the large idler roll and the C roll) falls within the set target value range G of the uncoiling roll gap, thereby achieving accurate control of the uncoiling roll gap. This invention cleverly transforms the target value range G of the uncoiling roll gap into the target longitudinal coordinate range of point E. By solving for the real-time longitudinal coordinate value of point E and determining whether it falls within the target longitudinal coordinate range of point E, accurate control of the uncoiling roll gap is achieved. Regardless of whether the outer diameter of the intermediate billet coil is large or small, or even non-circular, as long as the thickness of the intermediate billet is constant, this invention can control the uncoiling roll gap to reach the set uncoiling roll gap range, thereby further solving the problem of head knocking during the uncoiling process. Attached Figure Description

[0022] Figure 1 This is a structural schematic diagram of a hot roll box;

[0023] Figure 2 yes Figure 1 HH-direction sectional view;

[0024] Figure 3 yes Figure 2 A schematic diagram of the shovel head contacting the intermediate billet coil downwards;

[0025] Figure 4 yes Figure 3 A schematic diagram showing the large idler roll of the shovel head contacting the intermediate billet coil and reaching the uncoiling roll gap position;

[0026] Figure 5 This is a schematic diagram showing the intermediate billet coil being output with its tail straight.

[0027] In the diagram, 1-oil cylinder, 2-large swing arm, 3-insertion arm, 4-shovel head, 5-first angle sensor, 6-rack cylinder, 7-second angle sensor, 8-B idler roller, 9-intermediate billet steel coil, 10-A idler roller, 11-uncoiling C roller. Detailed Implementation

[0028] To enhance understanding of the present invention, the invention will be further described and explained below in conjunction with the accompanying drawings and specific embodiments.

[0029] This embodiment uses a hot-rolling box from a certain 1422 production line as an example. For ease of calculation, the thickness h of the intermediate billet is assumed to be 40mm. Figure 1 and Figure 2 As shown, it includes a large swing arm 2 hinged at one end to a gate base (not shown in the figure), an insertion arm 3 with one end hinged to the other end of the large swing arm 2 and an angle sensor 7 provided on the side, a shovel head 4 hinged to the other end of the insertion arm 3, a hydraulic cylinder 1 mounted on the large swing arm 2, the piston rod fork of the hydraulic cylinder 1 hinged to one end of the insertion arm 3, and an angle sensor 5 provided at one end of the large swing arm 2; an uncoiling roller C is provided below the shovel head; after being bent and formed in a hot rolling box, the steel coil 9 is as follows Figure 2 It is spiral-shaped.

[0030] This embodiment describes a method for controlling the diameter of intermediate billet steel coils in a hot-rolling box, which involves the following steps:

[0031] 1) Set the longitudinal axis sectional plane of the hot-rolled coil box and the intermediate billet coil along the same running direction as the coordinate plane, such as... Figure 2 As shown in Figure 3;

[0032] Project the hinge point between the insertion arm 3 and the large swing arm 2 of the hot roll box onto the coordinate plane to form point D.

[0033] Project the hinge point between the large swing arm 2 of the hot roll box and the archway base onto the coordinate plane to form point O.

[0034] Project the hinge point between the insertion arm 3 of the hot roll box and the shovel head 4 onto the coordinate plane to form point E.

[0035] Projecting the axis of the unwinding roll onto the coordinate plane forms point C.

[0036] 2) Establish a Cartesian coordinate system with point O as the origin in the coordinate plane. Assume that cylinder 1 is in full stroke mode. At this time, points O, E, and C form a triangle △ODE. The side lengths OD and ED of triangle △ODE are known fixed values. The coordinates of point C are also known fixed values, denoted as (X... C Y CThe included angle ∠DOE of triangle △ODE is a known fixed value β1, and the included angle ∠ODE of triangle △ODE is a known fixed value γ. Let β be the angle between line segment OD and the vertical coordinate, and let the first angle sensor 5 located at hinge point O read the value of β in real time. Let γ be the included angle, and let the second angle sensor 7 located at hinge point D read the value of γ in real time. In this embodiment, the coordinates of point C are (X...). C =2111.50mm,Y C =-3221mm), OD=2068mm, ED(DE)=1919.09 mm, OE=2378.37mm (high value, becomes longer when in low value).

[0037] 3) The target value G of the unwinding roll gap is set to a known fixed value range of 1.2h ± 2. In this embodiment, the range of G is (46mm, 50mm). In this embodiment, the radius of roll C RC = 200mm, the radius of the large idler roll RE = 150mm, and the target ordinate value Y of point E is determined according to the following formula (1). E Range (Y) E 1, Y E 2),

[0038] Y E =Y C +R C +G+R E (1);

[0039] YE1=-2825mm, YE2=-2821mm.

[0040] 4) As the insertion arm 3 and the shovel head 4 move closer to the intermediate billet steel coil 9, the angle sensor 5 reads β in real time. When the shovel head 4 contacts the intermediate billet steel coil 9 and presses down, the piston rod of the hydraulic cylinder 1 retracts. When the two small idler rollers on the shovel head assembly 4 are close to the outer circle of the steel coil, △ODE rotates downward with point O as the center and continues to rotate downward. The piston rod of the hydraulic cylinder 1 is passively retracted, △ODE begins to deform, ∠ODE, i.e., γ, increases, and the corresponding β1 (∠DOE) decreases. When the shovel head contacts the intermediate billet steel coil to unwind, the two small idler rollers on the shovel head are close to the outer circle of the intermediate billet steel coil, and the large idler roller on the shovel head is close to the inner circle of the intermediate billet steel coil. At this time, the angle sensor at point D reads the γ value in real time, and the angle sensor at point O reads the β value in real time. The OE length is calculated in real time according to the following formula (2).

[0041] OE 2 =OD 2 +DE 2 -2*OD*DE*cosγ (2),

[0042] As γ gradually increases, the OE value also increases, while β1 decreases.

[0043] In this embodiment, the angle sensor at point D reads the γ value in real time as 109.83 degrees ≈ 110 degrees.

[0044] OE 2 =OD 2 +DE 2 -2*OD*DE*cosγ=2068 2 +1919.09 2 -2*2068*1919.09*cos110,

[0045] The calculated OE is 3263.8 mm.

[0046] The value of β1 is calculated in real time according to the following formula (3).

[0047] cosβ1=(OE 2 +OD 2 -DE 2 ) / 2*OD*OE (3);

[0048] In this embodiment, the angle sensor at point O reads a real-time value of β = 110 degrees. Therefore, β1 is calculated to be 33.58 degrees.

[0049] 5) Then calculate the real-time ordinate value Y of point E according to the following formula (4). E’

[0050] Y E’ =OE*sin(90-β-β1) (4)

[0051] In this embodiment, based on the OE value, β1 value, and β value calculated in real time and read in real time, then Y E’ =OE*sin(90-β-β1)=3263.8*sin(90-110-33.58)=-2626.33mm.

[0052] 6) Y E’ With Y E Compare, if Y E’ Not falling into Y E Range (Y) E 1, Y E Within 2), i.e., Y E’ <Y E 1 or Y E’ >Y E 2. Continue pressing down the shovel head until Y... E’ Falling into Y E Range (Y) E 1, Y E Within 2), i.e., Y E 1 ≤ Y E’ ≤YE 2. Then stop pressing down on the shovel head and lock the shovel head position.

[0053] In this embodiment, due to Y E’ =-2626.33mm>-2821mm, therefore, it is necessary to continue pressing down the shovel head 4.

[0054] In this embodiment, since the outer diameter of the steel coil 9 is unknown, the γ and β values ​​read in real time from the first angle sensor 5 and the second angle sensor 7 are used for real-time calculation until the γ value is satisfied. E’ By controlling the uncoiling roll gap to fall within the target value range, the uncoiling roll gap can be controlled to reach the target range even when the outer diameter of the intermediate billet coil 9 fluctuates or is not round, and the knocking phenomenon during the uncoiling process is completely solved.

[0055] The above description is only a preferred embodiment of the present invention, but the present invention is not limited thereto. All equivalent substitutions or modifications made to the concepts and technical solutions of the present invention should be covered within the protection scope of the present invention.

Claims

1. A method for controlling the uncoiling roll gap of intermediate billet steel in a hot-rolled coil box, the hot-rolled coil box comprising a large swing arm hinged at one end to a gate base, an insert arm hinged at one end to the other end of the large swing arm, and a shovel head hinged to the other end of the insert arm. A hydraulic cylinder is mounted on the large swing arm, the piston rod fork of the hydraulic cylinder is hinged to one end of the insert arm, a first angle sensor is provided at one end of the large swing arm, and a second angle sensor is provided on the side of the insert arm hinged to the other end of the large swing arm. An uncoiling C-roller is provided below the shovel head; characterized in that… Perform the following steps: 1) Set the longitudinal axis sectional plane where the hot-rolled coil box and the intermediate billet coil are in the same running direction as the coordinate plane. Projecting the hinge point between the insertion arm and the large swing arm of the hot roll box into the coordinate plane forms point D. Projecting the hinge point between the large swing arm of the hot roll box and the archway base into the coordinate plane forms point O. Projecting the hinge point between the insertion arm of the hot roll box and the large idler roller on the shovel head into the coordinate plane forms point E. Projecting the axis of the unwinding C-roll onto the coordinate plane forms point C. 2) Establish a Cartesian coordinate system in the coordinate plane with point O as the origin. Set the cylinder to be in full stroke state. At this time, points O, E, and C form a triangle △ODE. The side lengths OD and ED of triangle △ODE are known fixed values. The coordinates of point C are known fixed values, denoted as (X... C Y C The included angle ∠DOE of triangle △ODE is a known fixed value β1; let the angle between line segment OD and the vertical coordinate be β and be read in real time by the first angle sensor at hinge point O; let the included angle ∠ODE of triangle △ODE be γ and be read in real time by the second angle sensor at hinge point D. 3) The target value G for the uncoiling roll gap is set to a known fixed value range of 1.2h ± 2, where h is the thickness of the intermediate billet coil, and the radius of the uncoiling roll C is a known fixed value R. C The radius of the large idler roller on the shovel head is a known fixed value R. E The range of the target ordinate value YE at point E is determined according to the following formula (1). E 1, Y E 2) Y E =Y C +R C +G+R E (1); 4) When the shovel head contacts the intermediate billet coil to unwind, the two small idler rollers on the shovel head are in close contact with the outer circle of the intermediate billet coil, and the large idler roller on the shovel head is in close contact with the inner circle of the intermediate billet coil. At this time, the second angle sensor at point D reads the γ value in real time, and the first angle sensor at point O reads the β value in real time. The OE length is calculated in real time according to the following formula (2). OE 2 =FROM 2 +DE 2 -2*OD*DE*cosγ (2), The value of β1 is calculated in real time according to the following formula (3). cosβ1=(OE) 2 +OD 2 -DE 2 ) / 2*OD*OE (3); 5) Then calculate the real-time ordinate value Y of point E according to the following formula (4). E ' Y E '=OE*sin(90-β-β1) (4) 6) Y E 'with Y E Compare, if Y E 'Not falling into Y' E If it is within the range, continue pressing down the shovel head until Y... E 'Falling into Y' E Once the blade is within the specified range, stop pressing down on the blade and lock the blade position.

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