A method for preventing coiler from slipping and piling steel

Abstract

The present invention relates to the field of hot-rolled strip steel, and more specifically, to a method for preventing coiler slippage and steel accumulation. The method comprises the following steps: after receiving information about the steel grade and specifications of the rolled strip, the coiler automatically calculates the expansion and contraction pressure of the coiler, thereby determining the initial and final expansion times. A safety zone is defined when the final expansion time is less than the auxiliary coiler opening time. By setting the expansion and contraction pressure and adjusting the safety zone, this method ensures normal coiling of the strip, resolving the problem of steel accumulation caused by slippage and unwinding of the strip head during coiling.

Description

Technical Field

[0001] The invention relates to the field of hot-rolled strip steel, in particular to a method for preventing a coiler from slipping and piling up steel. Background Art

[0002] Hot-rolled strip coilers typically use underground horizontal coilers. After the coiler's auxiliary rolls are positioned, the reel is in its initial expansion state. The strip head enters the coiler chamber normally and winds around the reel along the gap between the 1#, 2#, and 3# auxiliary rolls. After completing the set number of windings, the auxiliary rolls open, and the tension-building process ends. If the strip is not wound around the reel enough times, the three auxiliary rolls will not be able to wrap the strip head tightly around the reel, resulting in a large relative speed difference between the strip head and the reel, which can easily cause the strip head to slip and unwind.

[0003] CN201310075582.5 discloses a method for setting the gap between the auxiliary rolls of a coiler. The method sets different initial gap setting values ​​for the auxiliary rolls based on the characteristics of different strip steel specifications. When a host computer receives a "steel bite" signal, it retrieves the initial gap setting values ​​for the three corresponding auxiliary rolls from a static table of initial gap setting values ​​for the auxiliary rolls. These three values ​​are then sent to the coiler's basic winding automation computer, which compensates and corrects the gap setting values ​​based on the actual winding temperature, effectively reducing the occurrence of coiler slippage accidents. However, this method has a lag in adjusting the gap between the rolls, and the system's expansion and contraction pressure and the roll opening time cannot be precisely controlled. Consequently, the strip head may still slip and unwind during coiling, causing steel to pile up.

[0004] Based on the above problems, there is an urgent need to provide a method for effectively preventing the coiler from slipping and piling steel. Summary of the Invention

[0005] To address the above-mentioned shortcomings of the prior art, the present invention provides a method for preventing coiler slippage and steel accumulation. By setting the expansion and contraction pressure and adjusting the safety zone, normal strip coiling can be achieved, solving the problem of steel accumulation caused by the strip head slipping and unwinding during coiling.

[0006] In order to achieve the above-mentioned effect, the present invention provides a method for preventing the coiler from slipping and piling up steel. The method is as follows: after the coiler receives the steel type and specification information of the rolled strip steel, it automatically calculates the expansion and contraction pressure value of the coil, thereby determining the initial expansion time and the final expansion time. When the final expansion time of the strip steel is less than the opening time of the auxiliary coiling roller, it is a safe zone, and the strip steel is ensured to be coiled without piling up steel within the safety zone.

[0007] Further improvement of this solution, the calculation formula of the expansion and contraction pressure value is as follows:

[0008]

[0009] The unit of expansion and contraction pressure is bar, p1 is the pressure percentage of strip steel with different yield strengths, p2 is the pressure percentage of strip steel with different thicknesses, and p3 is the pressure percentage of strip steel with different widths.

[0010] A further improvement of this solution is to adjust the safe zone time as follows: the initial roll expansion is set to 2 turns and the final roll expansion is set to 5 turns. The actual number of initial expansion turns N1 = 2 + X, the number of final expansion turns N2 = 5 + X, and the number of final expansion turns < the number of turns N when the auxiliary roll is opened. X ≥ 0 and is an integer. X is the number of compensation turns.

[0011] Timing of opening the auxiliary reel roller: final expansion time t< auxiliary reel roller opening time = (2N*T+D)*π / V*(N2-N1), where N is the number of turns when the auxiliary reel roller is opened; T is the strip thickness, mm; D is the reel diameter, mm; π is the circumference; V is the rolling speed, m / s; t is the final expansion time, s.

[0012] A further improvement to this solution involves receiving information about the rolled strip steel grade and specifications from the MES system. The secondary model automatically calculates the coiler's expansion and contraction pressure, thereby determining the initial and final expansion times. When the final expansion time t is less than the coiler roll opening time, the coiler operates normally. When the final expansion time t is greater than the coiler roll opening time, the number of compensation turns X is increased by one turn at a time until the final expansion time t is less than the coiler roll opening time. Increasing the number of turns too much can lead to blockage, so the compensation turns are increased one turn at a time.

[0013] In a further improvement of this solution, the relationship between p1 and the yield strength σs is as follows: when σs < 100, p1 < 75; when 100 ≤ σs < 200, 75 ≤ p1 < 80; when 200 ≤ σs < 350, 80 ≤ p1 < 90; when 350 ≤ σs < 400, 90 ≤ p1 < 100; when σs > 400, p1 is 100; the unit of σs is N / ㎡. Preferably, the relationship between p1 and the yield strength σs is as follows: when σs < 100, p1 is 72.4; when 100 ≤ σs < 200, p1 is 76.9; when 200 ≤ σs < 350, p1 is 86; when 350 ≤ σs < 400, p1 is 90.5; when σs > 400, p1 is 100.

[0014] In a further improvement to this solution, the relationship between p2 and the strip thickness T is as follows: when 1 < T < 3, p2 < 80; when 3 ≤ T < 5, 80 ≤ p2 < 90; when 5 ≤ T < 10, 90 ≤ p2 < 100; when T ≥ 10, p2 is 100; T is expressed in mm. Preferably, when 1 < T < 3, p2 is 76.9; when 3 ≤ T < 5, p2 is 86; when 5 ≤ T < 10, p2 is 90.5; and when T ≥ 10, p2 is 100.

[0015] A further improvement of this scheme is that the relationship between p3 and the strip width W is as follows: when 800<W<900, p3<60; when 900≤W<1100, 60≤p3<70; when 1100≤W<1300, 70≤p3<80; when 1300≤W<1400, 80≤p3<90; when 1400≤W<1500, 90≤p3<100; when W≥1500, p3 is 100; the unit of W is mm. Preferably, the relationship between p3 and the strip width W is as follows: when 800<W<900, p3 is 58.8; when 900≤W<1100, p3 is 67.9; when 1100≤W<1300, p3 is 76.9; when 1300≤W<1400, p3 is 86; when 1400≤W<1500, p3 is 90.5; when W≥1500, p3 is 100.

[0016] The beneficial effects of the present invention are:

[0017] (1) During the strip rolling process, the rolling speed after finishing rolling is essentially consistent with the linear speed of the reel and the linear speed of the auxiliary reel. During coiling, the timing of the initial expansion of the reel and the number of coiling turns, as well as the reel expansion and contraction speed, are important factors affecting whether the strip head will slip and unwind. The present invention adjusts the system pressure for reel expansion and contraction according to different strip specifications to adapt to the coiling force of strips of different materials, specifications, and properties, thereby avoiding reel slippage caused by strip strength.

[0018] (2) Under the condition of optimized expansion and contraction pressure, the number of initial expansion turns of the roll and the number of opening turns of the auxiliary roll are adjusted. The present invention proposes a method for adjusting the safety interval to further ensure that the roll is prevented from slipping.

[0019] (3) Combining the above two methods, the expansion and contraction pressure of the reel system and the number of strip coils are adjusted by the system to make the reel movement timing within the safe range. Pre-judgment and setting in advance can effectively avoid the problem of loose coils and steel piles caused by the slippage of the coiler head, and achieve long-term stable control of strip coiling. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0021] Example 1:

[0022] A method for preventing a coiler from slipping and piling steel comprises the following steps: after the coiler receives information on the type and specification of the rolled strip steel, it automatically calculates the expansion and contraction pressure value of the coil, thereby determining the initial expansion time and the final expansion time; when the final expansion time of the strip steel is less than the opening time of the auxiliary coiling roller, it is a safe zone, and within the safety zone, it is ensured that the strip steel is coiled without steel piling.

[0023] The calculation formula of the expansion and contraction pressure value is as follows:

[0024]

[0025] The unit of expansion and contraction pressure is bar, p1 is the pressure percentage of strip steel with different yield strengths, p2 is the pressure percentage of strip steel with different thicknesses, and p3 is the pressure percentage of strip steel with different widths.

[0026] The adjustment method of the safe zone time is as follows: the initial roll expansion is set to 2 turns and the final roll expansion is set to 5 turns. The actual number of initial expansion turns N1 = 2 + X, the number of final expansion turns N2 = 5 + X, and the number of final expansion turns < the number of turns when the auxiliary roll is opened N, X ≥ 0 and is an integer, X is the number of compensation turns;

[0027] Timing of opening the auxiliary reel roller: final expansion time t< auxiliary reel roller opening time = (2N*T+D)*π / V*(N2-N1), where N is the number of turns when the auxiliary reel roller is opened; T is the strip thickness, mm; D is the reel diameter, mm; π is the circumference; V is the rolling speed, m / s; t is the final expansion time, s.

[0028] Example 2:

[0029] The method for preventing a coiler from slipping and piling steel comprises the following steps: after the coiler receives information on the type and specification of rolled strip steel according to the MES system, the secondary model automatically calculates the expansion and contraction pressure value of the coil, thereby determining the initial expansion time and the final expansion time; when the final expansion time t of the strip steel is less than the opening time of the auxiliary coiling roller, the coiler operates normally; when the final expansion time of the strip steel is greater than the opening time of the auxiliary coiling roller, the number of compensation turns X is increased by 1 turn each time until the final expansion time t is less than the opening time of the auxiliary coiling roller.

[0030] The relationship between p1 and yield strength σs is as follows: when σs < 100, p1 < 75; when 100 ≤ σs < 200, 75 ≤ p1 < 80; when 200 ≤ σs < 350, 80 ≤ p1 < 90; when 350 ≤ σs < 400, 90 ≤ p1 < 100; when σs > 400, p1 is 100; the unit of σs is N / ㎡. Preferably, the relationship between p1 and yield strength σs is as follows: when σs < 100, p1 is 72.4; when 100 ≤ σs < 200, p1 is 76.9; when 200 ≤ σs < 350, p1 is 86; when 350 ≤ σs < 400, p1 is 90.5; when σs > 400, p1 is 100.

[0031] The relationship between p2 and the strip thickness T is as follows: when 1 < T < 3, p2 < 80; when 3 ≤ T < 5, 80 ≤ p2 < 90; when 5 ≤ T < 10, 90 ≤ p2 < 100; when T ≥ 10, p2 is 100; T is in mm. Preferably, the relationship between p2 and the strip thickness T is as follows: when 1 < T < 3, p2 is 76.9; when 3 ≤ T < 5, p2 is 86; when 5 ≤ T < 10, p2 is 90.5; when T ≥ 10, p2 is 100.

[0032] The relationship between p3 and the strip width W is as follows: when 800<W<900, p3<60; when 900≤W<1100, 60≤p3<70; when 1100≤W<1300, 70≤p3<80; when 1300≤W<1400, 80≤p3<90; when 1400≤W<1500, 90≤p3<100; when W≥1500, p3 is 100; the unit of W is mm. Preferably, when 800<W<900, p3 is 58.8; when 900≤W<1100, p3 is 67.9; when 1100≤W<1300, p3 is 76.9; when 1300≤W<1400, p3 is 86; when 1400≤W<1500, p3 is 90.5; when W≥1500, p3 is 100

[0033] Example 3:

[0034] The implementation process of the present invention is automatically performed by a computer after the secondary model parameters are set. The specific process is as follows: the final expansion pressure range is automatically adjusted based on the yield strength, thickness, width, and rolling speed of the rolled strip; the number of turns of the auxiliary coiler is automatically set, and the coiling function is automatically implemented by the computer to meet production control requirements. This will be described below with reference to specific embodiments.

[0035] When the head of the target SPHC-1 carbon steel strip, with a yield strength of 700 N / m², a thickness of 3.0 mm, a width of 1200 mm, and a rolling speed of 12 m / s, reaches the coiler, the computer's secondary model automatically sets the expansion pressure to 86 bar (expansion pressure = (100 / 100) * (86 / 100) * (76.9 * 100) * 130 = 86 bar). The coiler is set to start after two turns, and the auxiliary coiler opens after five turns. (N = 5, V = 12 m / s, T = 3 mm, coiler diameter 745 mm, initial to final expansion time (T2 - T1) = 0.62 seconds)

[0036] By calculating the time from the start of the rise to the opening of the auxiliary coil is:

[0037] [2NT+745]*π÷V*(N2-N1)=0.6S<0.62s

[0038] Therefore, it is not safe to open the auxiliary roller after 5 turns.

[0039] The final number of rising circles is 6.

[0040] By calculating the time from the start of the rise to the opening of the auxiliary coil is:

[0041] [2NT+745]*π÷V*(N2-N1)=0.81S>0.62s

[0042] Therefore, it is safe to open the auxiliary winding roller after 6 turns to achieve normal winding.

[0043] Although the present invention has been described in detail with reference to preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, a person skilled in the art may make various equivalent modifications or substitutions to the embodiments of the present invention, and such modifications or substitutions shall be within the scope of the present invention. Any person skilled in the art who can easily conceive of changes or substitutions within the technical scope disclosed in the present invention shall be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope of protection of the claims.

Claims

1. A method for preventing coiler from slipping and piling steel, characterized in that: The method comprises the following steps: after the coiler receives the steel grade and specification information of the rolled strip according to the MES system, the secondary model automatically calculates the expansion and contraction pressure value of the coiler, thereby determining the initial expansion time and the final expansion time; when the final expansion time t of the strip is less than the opening time of the auxiliary coiler, the coiler operates normally; when the final expansion time t of the strip is greater than the opening time of the auxiliary coiler, the number of compensation turns X is increased by 1 turn each time until the final expansion time t is less than the opening time of the auxiliary coiler; when the final expansion time of the strip is less than the opening time of the auxiliary coiler, it is a safe zone, and it is ensured that the strip is coiled without steel accumulation within the safety zone; The calculation formula of the expansion and contraction pressure value is as follows: ； The unit of expansion and contraction pressure is bar, p1 is the pressure percentage of strip steel with different yield strengths, p2 is the pressure percentage of strip steel with different thicknesses, and p3 is the pressure percentage of strip steel with different widths; The relationship between p1 and yield strength σs is as follows: when σs < 100, p1 < 75; when 100 ≤ σs < 200, 75 ≤ p1 < 80; when 200 ≤ σs < 350, 80 ≤ p1 < 90; when 350 ≤ σs < 400, 90 ≤ p1 < 100; when σs > 400, p1 is 100; the unit of σs is N / m 2 ; The relationship between p2 and strip thickness T is as follows: when 1<T<3, p2<80; when 3≤T<5, 80≤p2<90; when 5≤T<10, 90≤p2<100; when T≥10, p2 is 100; T is in mm; The relationship between p3 and strip width W is as follows: when 800<W<900, p3<60; when 900≤W<1100, 60≤p3<70; when 1100≤W<1300, 70≤p3<80; when 1300≤W<1400, 80≤p3<90; when 1400≤W<1500, 90≤p3<100; when W≥1500, p3 is 100; the unit of W is mm; The adjustment method of the safe zone time is as follows: the preset initial roll expansion N1 is 2 turns, the final roll expansion N2 is 5 turns, the actual initial roll expansion N1 = 2 + X, the final roll expansion N2 = 5 + X, and the final roll expansion N2 < the number of turns when the auxiliary roll is opened N, X ≥ 0 and is an integer, X is the compensation number of turns; Timing of opening the auxiliary coiling roller: final expansion time t< auxiliary coiling roller opening time = (2N*T+D)*π / V*(N2-N1), where N is the number of coiling turns when the auxiliary coiling roller is opened; T is the strip thickness, mm; D is the reel diameter, mm; π is the circumference; V is the rolling speed, m / s; t is the final expansion time, s.

2. The method for preventing coiler from slipping and steel piling according to claim 1, characterized in that: The relationship between p1 and yield strength σs is as follows: when σs<100, p1 is 72.4; when 100≤σs<200, p1 is 76.9; when 200≤σs<350, p1 is 86; when 350≤σs<400, p1 is 90.5; when σs>400, p1 is 100.

3. The method for preventing coiler from slipping and piling steel according to claim 1, characterized in that: The relationship between p2 and strip thickness T is as follows: when 1<T<3, p2 is 76.9; when 3≤T<5, p2 is 86; when 5≤T<10, p2 is 90.5; when T≥10, p2 is 100.

4. The method for preventing coiler from slipping and steel piling according to claim 1, characterized in that: The relationship between p3 and the strip width W is as follows: when 800<W<900, p3 is 58.8; when 900≤W<1100, p3 is 67.9; when 1100≤W<1300, p3 is 76.9; when 1300≤W<1400, p3 is 86; when 1400≤W<1500, p3 is 90.5; when W≥1500, p3 is 100.

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