A method for controlling coiling and splitting of thin-gauge strip steel

Abstract

The present invention relates to the technical field of automatic control of steel rolling, and specifically discloses a method for controlling the coiling and splitting of thin-gauge strip steel. It is expected that when the tail of the strip stays at a specified position, the head of the strip stays at a specific position interval on the coil core. During splitting, a reasonable shearing position interval of the tail of the strip is dynamically displayed. The operator selects the "head and tail positioning" mode for splitting, and the system automatically matches the interval to achieve shearing and splitting. After the strip tail is swung off, the head and tail of the strip can stay in the predetermined position interval, so that the inner ring strip layers of the coil core are tightly fitted under the action of gravity. The present invention automatically achieves the matching of the position of the tail of the strip and the head of the strip, ensures the inner ring strip layers of the coil core are tightly fitted, effectively avoids the problem of the head of the thin-gauge strip steel being bent and folded on the coil core, and does not require manual intervention. It directly creates good coil core conditions for subsequent labeling, lifting, and packaging operations, thereby improving work efficiency and reducing safety risks.

Description

Technical Field

[0001] The present invention relates to the technical field of steel rolling automatic control, in particular to a method for controlling the coiling and splitting of thin-gauge steel strips. Background Art

[0002] When coiling thin strip, if the strip head is not properly positioned on the core, it can easily bend and collapse, obstructing the coil eye. This can affect the automatic label printing robot from printing the label inside the coil core. When the coil is subsequently hoisted, the bent strip head can be easily pinched by the crane clamp, potentially causing a coiling accident.

[0003] Currently, methods commonly used include using adhesive tape to secure the tape head on the inner ring, or adding a retaining ring to the eye to provide support for the tape head, to prevent the tape head from bending on the winding core. The following problems exist in actual application:

[0004] 1. Increase extra workload. Tape sticking or using retaining rings require on-site operation by operators.

[0005] 2. When further uncoiling and further processing is performed, the tape or retaining ring needs to be removed, which increases the workload. Therefore, it is necessary to design a method for controlling the coiling and splitting of thin-gauge strip to solve the existing problems of the thin-gauge strip head collapsing on the coil core and the thin-gauge strip head bending and folding on the coil core. Summary of the Invention

[0006] In view of the problems existing in the prior art, the object of the present invention is to provide a method for controlling the coiling and splitting of thin-gauge strip steel.

[0007] The technical solution adopted by the present invention to solve the technical problem is: a method for controlling the coiling and splitting of thin-gauge strip steel, comprising the following steps:

[0008] 1) When the tape tail is expected to stay at the specified position, the tape head stays at a specific position interval on the winding core;

[0009] 2) Dynamically display the reasonable cutting position range of the tail volume when splitting;

[0010] 3) The operator selects the "header and tailer positioning" mode for splitting, and the system automatically matches the area to achieve shearing and splitting;

[0011] 4) After the strip tail is swung off, the strip head and tail can stay in the predetermined position range, so that the inner ring strip layers of the core are tightly fitted under the action of gravity.

[0012] Specifically, when the tail of the tape stays at the specified position in step 1), the head of the tape stays at a specific position range on the core, which means that the positions of the head of the tape core and the tail of the tape on the outer ring are modeled as points on a circular ring, with 0 o'clock as position 0, and arranged clockwise. The angles of the points on the circular ring corresponding to the directions of 2 o'clock, 4 o'clock, 8 o'clock, and 10 o'clock are 1 / 3π, 2 / 3π, 4 / 3π, and 5 / 3π, respectively. When the tail of the tape stays at 4 o'clock in the upper winding mode, the head of the tape stays at 2 to 4 o'clock; when the tail of the tape stays at 8 o'clock in the lower winding mode, the head of the tape stays at 8 to 10 o'clock.

[0013] Specifically, the reasonable shearing position range of the tail coil dynamically displayed in step 2) is the angle range β of the corresponding position point of the strip head suitable for shearing, which is calculated by continuous iteration according to the rotation angle α of the coiler that needs to continue to operate after shearing.

[0014] Specifically, the rotation angle α is to ensure that after the flying shear cuts the strip into coils, the tail of the strip can reach the upper coiling position 2 / 3π and the lower coiling position 4 / 3π in the predetermined area. The measurement process is as follows:

[0015] The strip length from the coiler to the turning roller is

[0016] Strip tangent angle on coiler ;

[0017] Steel corner wrap on steering roller ; The length of the strip on the turning roller corresponding to the wrap angle δ is the arc length ,

[0018] The goal is to rotate the tail to 4 o'clock (2 / 3π position), and the rotation angle α of the coiler to continue running after the flying shear is α=2(L1+L2+L δ ) / D+4 / 3π-γ=11 / 6π+( +2L2+( )d2) / D - -

[0019] The reverse calculation is based on the goal of rotating the core tape head to between 2 and 4 o'clock (1 / 3π to 2 / 3π positions). The angular position β range that the core tape head should be in during flying shear cutting is between β1 = (1 / 3π + α) and β2 = (2 / 3π + α), with the preferred β = 1 / 2π + α.

[0020] Substituting the known quantities, we get

[0021] β1=(1 / 3π+α)=(13 / 6π+2( +L2+( )d2 / 2) / D- - )=(13 / 6π+( +2L2+( )d2) / D - - )

[0022] β2=(2 / 3π+α)=(5 / 2π+2( +L2+( )d2 / 2) / D- - )=(5 / 2π+( +2L2+( )d2) / D - - )

[0023] Preferably,

[0024] β=(1 / 2π+α)=(7 / 3π+2( +L2+( )d2 / 2) / D- - )=(7 / 3π+( +2L2+( )d2) / D - - )

[0025] By analogy, when coiling, the strip length from the coiler to the turning roller is L1=

[0026] The tangent angle of the strip on the coiler is γ = ;

[0027] Strip steel wrap angle on the turning roller δ= ;

[0028] The length of the strip on the turning roller corresponding to the wrap angle δ is the arc length L δ =d2 / 2*δ=( )d2 / 2;

[0029] The goal is to rotate the tail to 8 o'clock (4 / 3π position), and the coiler needs to continue to run after the flying shear cuts at an angle of α=2(L1+L2+L δ ) / D+1 / 3π+γ=-1 / 6π +( +2L2+( )d2) / D + .

[0030] The goal is to rotate the core tape head to between 8 and 10 o'clock (4 / 3π to 5 / 3π). The angular position β of the core tape head during flying shearing should be between β1 = (4 / 3π - α) and β2 = (5 / 3π - α), with the optimal β = 3 / 2π - α.

[0031] β1=(4 / 3π-α)=(3 / 2π-( +2L2+( )d2) / D +

[0032] β2=(5 / 3π-α)=(11 / 6π-( +2L2+( )d2) / D +

[0033] Preferably, β=(3 / 2π-α)=(5 / 3π-( +2L2+( )d2) / D + .

[0034] Specifically, D is the coil diameter on the coiler, d1 is the inner diameter of the coil core which is a fixed value, d2 is the diameter of the steering roller which is a fixed value, L2 is the distance from the steering roller to the flying shear which is a fixed value, L0 is the horizontal distance between the coiler core shaft and the steering roller, and H0 is the vertical distance.

[0035] Specifically, the angle interval β=[β1, β2], wherein when winding up, β1=(1 / 3π+α), β2=(2 / 3π+α), preferably β=(1 / 2π+α); when winding down, β1=(4 / 3π-α), β2=(5 / 3π-α), preferably β=(3 / 2π-α).

[0036] Specifically, in the "head and tail positioning" mode of strip splitting in step 3), the head of the strip core is rotated to the angle position β interval [β1, β2]. The electronic control system issues a cutting interval prompt on the HMI screen. After the operator selects the "head and tail positioning" mode of strip splitting instruction and issues it, the system automatically matches the strip cutting in this interval.

[0037] The present invention has the following beneficial effects:

[0038] The invention designs a method for controlling the coiling and splitting of thin-gauge steel strips

[0039] When the operator plans to split the rolls, the electronic control system will automatically give the splitting interval node prompts. After the operator selects the "head and tail positioning" mode for splitting, the splitting work is automatically completed, which is simple and convenient to operate.

[0040] Ensures tight contact between the inner coil layers, effectively preventing the bending and folding of thin strip heads on the coil core. No manual intervention is required, creating excellent coil core conditions for subsequent labeling, lifting, and packaging operations, improving work efficiency and reducing safety risks.

[0041] (3) The position matching between the tail and the head of the belt is achieved automatically, which has strong promotion and application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 This is a schematic diagram of the position of the head and tail of the upper winding belt.

[0043] Figure 2 This is a schematic diagram of the position of the head and tail of the lower winding belt.

[0044] Figure 3 It is a schematic diagram of the flying shear roll-splitting and coiling process.

[0045] In the figure: 1-strip head; 2-strip tail; 3-0 o'clock 0 angle position; 4-1 / 3π angle position at 2 o'clock; 5-4 o'clock 2 / 3π angle position; 6-8 o'clock 4 / 3π angle position; 7-10 o'clock 5 / 3π angle position; 8-flying shear; γ-strip tangent angle on the coiler; δ-strip wrap angle on the steering roller; L1-strip length from the coiler to the steering roller; L2-strip length from the steering roller to the flying shear; D-coil diameter of the steel coil on the coiler; L0-horizontal distance between the coiler core shaft and the steering roller; H0-vertical distance between the coiler core shaft and the steering roller; d2-diameter of the steering roller. DETAILED DESCRIPTION

[0046] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely further describe the technical solutions in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0047] like Figure 1-3 The embodiment shown is a method for controlling the coiling and splitting of thin-gauge strip steel, which is used in a continuous hot-dip galvanizing production line to solve the problem of matching and positioning the strip head and tail after the strip steel coiling and splitting control in the upper coiling mode.

[0048] The inner diameter of the winding core of this production line is d1 = 610mm, the diameter of the steering roller is d2 = 1250mm, and the distance from the steering roller to the flying shear is L2 = 5m. The horizontal distance between the coiler mandrel and the steering roller is L0 = 3m, and the vertical distance is H0 = 3m.

[0049] The above-mentioned method for controlling the coiling and splitting of thin-gauge strip steel comprises the following steps:

[0050] When planning to start coiling, the operator selects the "head and tail positioning" mode for coiling. At this time, the outer diameter of the steel coil D = 1600mm.

[0051] After the flying shear cuts, the tail of the belt is rotated to the 4 o'clock direction (2 / 3π position) as the goal. The rotation angle α of the coiler to continue running after the flying shear cuts is 2 (L1+L2+L δ ) / D+4 / 3π-γ= 11 / 6π+(+2L2+()d2) / D -=5.1723π;

[0052] β1=(1 / 3π+α)=5.5056π=1.5056π;

[0053] β2=(2 / 3π+α)=5.8390π=1.8390π;

[0054] Preferred β=(1 / 2π+α)=5.6723π=1.6723π.

[0055] When the core strip head rotates to the angle position β range [1.5056π, 1.8390π], preferably 1.6723π, the electronic control system issues a cutting interval prompt on the HMI screen. After the operator selects the "head and tail positioning" mode and the roll splitting instruction is issued, the system automatically matches the strip cutting in this range.

[0056] As the outer diameter D changes, the system continuously iterates and calculates a new shearing interval prompt. The system then automatically matches the operating instructions to shear the strip within this interval.

[0057] After the flying shear is completed, the tail of the strip stays at the 4 o'clock position, and the head of the strip stays at the 2 to 4 o'clock position, preferably at the 3 o'clock position. Under the action of gravity, the inner ring of the core strip steel layers are tightly fitted together, avoiding the problem of thin-gauge strip steel heads bending and folding on the core.

[0058] The present invention is not limited to the above-mentioned embodiments. Anyone should be aware that any structural changes made under the guidance of the present invention, and any technical solutions that are the same or similar to those of the present invention, fall within the scope of protection of the present invention.

[0059] The technology, shape, and structure not described in detail in the present invention are all well-known technologies.

Claims

1. A method for controlling the coiling and splitting of thin-gauge steel strips, characterized in that: The following steps are involved: 1) When the tape tail is expected to stay at the specified position, the tape head stays at a specific position interval on the winding core; 2) Dynamically display the reasonable cutting position range of the tail of the tape during the splitting process. The dynamic display of the reasonable cutting position range of the tail of the tape is based on the rotation angle α that the coiler needs to continue to operate after the flying shear cuts, and continuously iteratively calculates the angle range β corresponding to the position point of the tape head suitable for cutting; The rotation angle α is to ensure that after the flying shear cuts the strip into coils, the tail of the strip can reach the upper coiling position 2 / 3π and the lower coiling position 4 / 3π in the predetermined area. The measurement process is as follows: The strip length from coiler to turning roller is , Strip tangent angle on coiler ; Strip steel wrap angle on the turning roller during coiling ; The length of the strip on the turning roller corresponding to the wrap angle δ is the arc length ; The strip wrap angle δ on the turning roller during down coiling = ; The length of the strip on the turning roller corresponding to the wrap angle δ is the arc length L δ =d2 / 2*δ=( )d2 / 2; After the flying shear cuts, the coiler needs to continue to run so that the tail of the strip can be rotated to the specified position. When coiling, α=2 (L1+L2+L δ ) / D+4 / 3π-γ= 11 / 6π+( +2L2+( )d2) / D - - ; When winding down, α=2(L1+L2+L δ ) / D+1 / 3π+γ=-1 / 6π +( +2L2+( )d2) / D + ; D is the coil diameter on the coiler, d1 is the inner diameter of the coil core and is a fixed value, d2 is the diameter of the steering roller and is a fixed value, L2 is the distance from the steering roller to the flying shear and is a fixed value, L0 is the horizontal distance between the coiler core shaft and the steering roller, and H0 is the vertical distance; The angle interval β=[β1, β2], where β1=(1 / 3π+α), β2=(2 / 3π+α) when coiling up; β1=(4 / 3π-α), β2=(5 / 3π-α) when coiling down; 3) The operator selects the "Header and Tail Positioning" mode for splitting, and the system automatically matches the area to cut and split the rolls; 4) After the strip tail is swung off, the strip head and tail can stay in the predetermined position range, so that the inner ring strip layers of the core are tightly fitted under the action of gravity.

2. The method for controlling coiling and splitting of thin-gauge steel strip according to claim 1, characterized in that: In step 1), when the tape tail stays at the specified position, the tape head stays at a specific position range on the winding core. This means that the positions of the tape head and the tape tail of the outer ring are modeled as points on a circular ring, with 0 o'clock as position 0 and arranged clockwise. The angles of the points on the circular ring corresponding to the directions of 2 o'clock, 4 o'clock, 8 o'clock, and 10 o'clock are 1 / 3π, 2 / 3π, 4 / 3π, and 5 / 3π, respectively. When the tape tail stays at the 4 o'clock position in the upper winding mode, the tape head stays at the 2 to 4 o'clock position; when the tape tail stays at the 8 o'clock position in the lower winding mode, the tape head stays at the 8 to 10 o'clock position.

3. The method for controlling coiling and splitting of thin-gauge steel strip according to claim 1, characterized in that: In the step 2), when winding upward, the preferred angle interval β is β=(1 / 2π+α); when winding downward, the preferred angle interval β is β=(3 / 2π-α).

4. The method for controlling coiling and splitting of thin-gauge steel strip according to claim 1, characterized in that: In step 3), the strip splitting mode of "positioning the head and tail" is used, i.e., the strip head of the core is rotated to the angle position β interval [β1, β2]. The electronic control system issues a cutting interval prompt on the HMI screen. After the operator selects the "positioning the head and tail" mode and issues the strip splitting instruction, the system automatically matches the strip cutting in this interval.

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