A method for randomly setting the maximum loop filling amount of an entry loop of an acid pickling line

Abstract

This invention relates to a method for randomly setting and controlling the maximum filling amount of the pickling and rolling line inlet looper. When the start and end welding of the pickling and rolling line inlet strip is completed, the inlet looper begins filling. The maximum filling amount of the inlet looper at the end of each filling operation is set according to the following formula: S 设 =[S 中 +(0.5-R)πD / (2×L) 100% )]×100%, the sheave diameter is D, and the total length of the loop at 100% looping is L. 100% S 中 Set a median value for the maximum set size, with R being a random value between (0, 1), and S... 设 This formula, set for each filling, can be directly maintained in the program, automatically calculating the maximum filling value before each filling. This effectively avoids uneven and excessive wear of the wear-resistant blocks of the loop drive sheave, improves the stability of the tension of the inlet loop strip, avoids alarm shutdowns caused by excessive tension fluctuations, and also increases the service life of the wear-resistant blocks, reduces spare parts consumption, and lowers production costs.

Description

Technical Field

[0001] This patent application belongs to the technical field of pickling-cold continuous rolling process for cold-rolled strip, and more specifically, it relates to a control method for randomly setting the looper quantity at the entrance of the pickling and rolling line before each filling. Background Technology

[0002] Because the pickling-cold rolling combined unit adopts a continuous strip rolling production mode with connected end-to-end strip, and the movement speed of different processes in the entire production line is not always equal, loopers are required between each section. The loopers are used to fill and release strip steel to accommodate the speed difference between the preceding and following sections, ensuring continuous and uninterrupted production. When the upstream welding machine stops welding strip steel, the inlet looper releases the strip to maintain the operation of the downstream pickling process section. When welding is completed, it is quickly filled to its maximum capacity to prepare for the next welding operation. The filling and releasing of the looper is accomplished by the lateral movement of the looper carriage, which is driven by the rotation of the main drive sheave, which in turn moves the wire rope, thus tractioning the looper carriage. The drive sheave rim is designed with grooves for installing wear-resistant blocks, which are installed within the grooves. The wire rope is looped around the sheave and contacts the wear-resistant blocks. When a wire rope is tensioned under a certain tension, it drives the rope pulley to rotate. The wire rope moves by the static friction between the wear-resistant block and the wire rope. The wear-resistant block wears down continuously during the movement.

[0003] Ideally, the wear-resistant blocks should wear evenly around the entire ring, while the sheave maintains good roundness. However, in actual production, uneven wear of the wear-resistant blocks is common, with some areas experiencing rapid wear. This can lead to a sheave roundness error exceeding 15mm. During one rotation of the sheave, the linear speed alternates between fast and slow, and the wire rope also bounces up and down radially along the sheave, causing fluctuations in the belt tension. Sometimes, excessive tension fluctuations can trigger production line alarms and shutdowns. Furthermore, due to the rapid wear in some areas, it is necessary to replace the entire set of wear-resistant blocks, significantly reducing the overall lifespan of the wear-resistant blocks and resulting in wasted spare parts costs.

[0004] The uneven wear of the wear-resistant blocks is related to the following: After each welding operation, the inlet looper is filled with a fixed maximum fill weight. Therefore, when the looper reaches its maximum fill weight, the contact position between the drive pulley and the wire rope is always fixed. During the transition from static to dynamic motion, the looper begins to release the sleeve, resulting in the greatest friction between the wear-resistant blocks and the pulley due to the added acceleration. This leads to the greatest wear on the wear-resistant blocks. Over long-term operation, this results in excessively rapid wear in certain areas of the wear-resistant blocks.

[0005] To solve this problem, there is an urgent need for a scientific, formulaic, and software-automatic control method that randomly sets the maximum filling amount of the inlet looper, so as to avoid the wire rope always being in a fixed position when the maximum filling amount is reached, and to avoid uneven wear of the wear-resistant blocks. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a random setting control method for the maximum filling amount of the looper at the entrance of the pickling line. This method can generate a random amount as the maximum filling amount setting value before each filling of the looper at the entrance. This ensures that the rope pulley has an equal probability of contacting the wire rope at the maximum filling amount position within a circumference, effectively avoiding the problem of uneven wear of the wear-resistant blocks caused by contact at a single position.

[0007] To solve the above problems, the technical solution adopted by the present invention is as follows: A method for randomly setting and controlling the maximum filling amount of the looper at the entrance of a pickling and rolling line includes the following steps: S1. Obtain the value R of the random variable between (0, 1); S2, Obtain the set median value S of the maximum loop size. 中 ; S3. Obtain the randomized set value S of the maximum loop quantity for each filling based on the calculation formula. 设 The specific calculation formula is S 设 =[S 中 +(0.5-R)πD / (2×L 100% )]×100%; D is the diameter of the loop drive sheave, in meters; L 100% The total length is given when the looper is 100% looped, in meters; S 中 The median value for the maximum kit size is set as a percentage; R is a random value generated for each kit setting between (0, 1); S 设 This is the set value for each refill, expressed as a percentage. S4. Integrate steps S1 to S3 into the production line control program to calculate the maximum amount of kitting for each filling, and control the operation of the production line according to the obtained calculated value to achieve the control objective.

[0008] Furthermore, the maximum amount of material that can be fully sizing is not a fixed value, but rather falls within [S]. 中 -0.5πD / (2×L 100% )]×100% and [S 中 +0.5πD / (2×L 100% A random value of 100% (R) is obtained. When R=0, S is obtained. 设 The maximum is [S] 中 +0.5πD / (2×L 100% When R=1, we get S. 设 The minimum is [S] 中 -0.5πD / (2×L 100%)]×100%, since the R value is randomly selected in the interval (0, 1) each time, the maximum amount of nesting to be completed is not a fixed value, but rather between [S 中 -0.5πD / (2×L 100% )]×100% and [S 中 +0.5πD / (2×L 100% A random value of 100% ()]×100%.

[0009] Furthermore, the diameter D of the loop drive sheave is 1.5m, and S... 中 90%, L 100% It is 150m.

[0010] Furthermore, the R value is a random value generated each time the set is filled (0, 1). Each time the set is filled, the computer calls the system's built-in random function to calculate and generate the value. For example, the R value (0, 1) is randomly generated by the random function rand() or srand().

[0011] Furthermore, the R value was 0.42 when the first roll was welded and ready for filling; the R value was 0.03 when the second roll was welded and ready for filling; and the R value was 0.9 when the third roll was welded and ready for filling.

[0012] Furthermore, the maximum number of loops for each roll of filling remains within the range of [89.215%, 90.785%].

[0013] Due to the adoption of the above technical solution, the beneficial effects achieved by this invention are: This invention can automatically realize its function through program control. Operators do not need to change their previous operating habits. By randomly setting the maximum filling amount value, the relevant formulas can be directly maintained in the program. The maximum filling amount value is automatically calculated before each filling. At the maximum filling amount position, the drive rope wheel is made to contact with each position with equal probability within one revolution. This can effectively avoid uneven and excessive wear of the wear-resistant blocks of the loop drive rope wheel, improve the stability of the tension of the inlet loop strip, avoid alarm shutdown caused by excessive tension fluctuation value, and also improve the service life of the wear-resistant blocks, reduce spare parts consumption, and reduce production costs. Attached Figure Description

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

[0015] The present invention will be further described in detail below with reference to the embodiments.

[0016] A method for randomly setting and controlling the maximum filling amount of the looper at the entrance of a pickling and rolling line, such as... Figure 1 This is automatically implemented in the production line control program, including the following steps: (1) Obtain the random variable value R between (0, 1), and the program automatically calculates the production before each filling action is started; (2) Obtain the set median value S of the maximum loop quantity. 中 The median value S in this setting 中 Changes can be made within the program or input via the human-computer interaction interface; (3) Obtain the random set value S of the maximum loop quantity for each filling according to the calculation formula. 设 The specific calculation formula is S 设 =[S 中 +(0.5-R)πD / (2×L 100% )]×100%.

[0017] Where D is the diameter of the loop drive sheave (in meters), and L... 100% S is the total length (in meters) when the looper is 100% looped. 中 Set a median value (one hundredth) for the maximum quantity. The R value is a random value generated each time the quantity is set (0, 1). Each time the quantity is set, it is calculated by the computer using the system's built-in random function. For example, the R value (0, 1) is randomly generated by the random function rand() or srand(). 设 This is the set value (in percentages) for each refill.

[0018] (4) All the above steps are implemented in the production line control program to complete the calculation of the maximum amount of filling each time, and control the operation of the production line according to the calculated value to achieve the control purpose.

[0019] According to the above control method, the maximum amount of strip filling completed each time is not a fixed value, but rather falls between [S]. 中 -0.5πD / (2×L 100% )]×100% and [S 中 +0.5πD / (2×L 100% A random value multiplied by 100%. The reason is: When R=0, we get S 设 The maximum is [S] 中 +0.5πD / (2×L 100% When R=1, we get S. 设 The minimum is [S] 中 -0.5πD / (2×L 100% )]×100%, since the R value is randomly selected in the interval (0, 1) each time, the maximum amount of nesting to be completed is not a fixed value, but rather between [S 中 -0.5πD / (2×L 100% )]×100% and [S 中+0.5πD / (2×L 100% A random value of 100% ()]×100%.

[0020] The implementation of the present invention will be described in detail below with reference to specific embodiments, but the scope of protection of the present invention is not limited to the following embodiments.

[0021] Example 1: The total length L of the looper at the entrance of a certain pickling and rolling line when the looper is at 100% looper capacity. 100% The length is 150m; the diameter D of the loop drive sheave is 1.5m; S 中 Set the median value for the maximum kit size, and input 90% in the human-machine interface; the R value is a random value generated each time the kit is filled, between (0, 1).

[0022] ① After the first roll is welded and ready for sleeve filling, the computer gives an R value of 0.42. The maximum sleeve filling setting value is then determined according to the formula S. 设 =[S 中 +(0.5-R)πD / (2×L 100% Calculate by multiplying by 100% to obtain S. 设 =[90%+(0.5-0.42)π×1.5 / (2×150)]×100%=90.1256%, that is, the maximum amount of strip filling completed in this coil is 90.1256%; ② After the second roll is welded and the filling is prepared, the computer gives an R value of 0.03. The maximum filling amount is then set according to the formula S. 设 =[S 中 +(0.5-R)πD / (2×L 100% Calculate by multiplying by 100% to obtain S. 设 =[90%+(0.5-0.03)π×1.5 / (2×150)]×100%=90.7379%, that is, the maximum amount of strip steel completed in this coil is 90.7379%; ③ After the third volume is welded and the sleeve is ready, the computer gives an R value of 0.9. The maximum sleeve quantity setting value is then determined according to the formula S. 设 =[S 中 +(0.5-R)πD / (2×L 100% Calculate by multiplying by 100% to obtain S. 设 =[90%+(0.5-0.9)π×1.5 / (2×150)]×100%=89.372%, that is, the maximum amount of strip steel completed in this coil is 89.372%; It can be seen that the maximum sleeve filling value of each roll is different and always within the range of [89.215%, 90.785%]. This ensures that the contact position between the wear-resistant block of the drive sheave and the wire rope is different each time the sleeve filling is completed, thus ensuring uniform wear.

Claims

1. A method for randomly setting and controlling the maximum filling amount of the looper at the entrance of a pickling and rolling line, characterized in that: Includes the following steps S1. Obtain the value R of the random variable between (0, 1); S2, Obtain the set median value S of the maximum loop size. 中 ; S3. Obtain the randomized set value S of the maximum loop quantity for each filling based on the calculation formula. 设 The specific calculation formula is S 设 =[S 中 +(0.5-R)πD / (2×L 100% )]×100%; D is the diameter of the loop drive sheave, in meters; L 100% The total length is given when the looper is 100% looped, in meters; S 中 The median value for the maximum kit size is set as a percentage; R is a random value generated for each kit setting between (0, 1); S 设 This is the set value for each refill, expressed as a percentage. S4. Integrate steps S1 to S3 into the production line control program to calculate the maximum amount of kitting for each filling, and control the operation of the production line according to the obtained calculated value to achieve the control objective.

2. The method for randomly setting and controlling the maximum filling amount of the looper at the entrance of a pickling and rolling line according to claim 1, characterized in that: When R=0, we get S 设 The maximum is [S] 中 +0.5πD / (2×L 100% When R=1, we get S. 设 The minimum is [S] 中 -0.5πD / (2×L 100% )]×100%, since the R value is randomly selected in the interval (0, 1) each time, the maximum amount of nesting to be completed is not a fixed value, but rather between [S 中 -0.5πD / (2×L 100% )]×100% and [S 中 +0.5πD / (2×L 100% A random value of 100% ()]×100%.

3. The method for randomly setting and controlling the maximum filling amount of the looper at the entrance of a pickling and rolling line according to claim 1, characterized in that: The diameter D of the loop drive sheave is 1.5m, S 中 90%, L 100% It is 150m.

4. The method for randomly setting and controlling the maximum filling amount of the looper at the entrance of a pickling and rolling line according to claim 1, characterized in that: R is a random value generated for each charge setting, ranging from (0, 1). It is calculated and generated by the computer calling the system's built-in random function each time a charge is set.

5. The method for randomly setting and controlling the maximum filling amount of the looper at the entrance of a pickling and rolling line according to claim 1, characterized in that: The R-value was 0.42 when the first roll was welded and ready for filling; the R-value was 0.03 when the second roll was welded and ready for filling; and the R-value was 0.9 when the third roll was welded and ready for filling.

6. A method for randomly setting and controlling the maximum filling amount of the looper at the entrance of a pickling and rolling line according to any one of claims 1-5, characterized in that: The maximum number of loops for each roll of filling remains within the range of [89.215%, 90.785%].

Images