A method for calculating the coil unloading height

Abstract

The present invention relates to a method for calculating the coil unloading height, belonging to the technical field of rolling control methods. The technical solution of the present invention is: two rollers are installed on the coil unloading trolley, and the trolley unloads the coil in two lifts. The height of the first lift of the coil unloading trolley is obtained as: . The beneficial effect of the present invention is: by installing two rollers on the coil unloading trolley to calculate the corresponding data, the lifting height of the coil unloading trolley can be automatically calculated, effectively reducing the labor intensity of workers and labor costs, and automatic coil unloading can be realized, improving the production rhythm and production efficiency.

Description

Technical Field

[0001] The present invention relates to a method for calculating the uncoiling height, belonging to the technical field of rolling control methods. Background Art

[0002] At the exit of the cold rolling production line, a coil unloading trolley unloads the steel coil from the coiling mandrel. When uncoiling, the coil unloading trolley needs to be lifted to a certain height so that the coil unloading trolley can hold the steel coil without damaging the coiling mandrel due to force; the traditional method is for the operator to manually control the lifting and lowering of the coil unloading trolley, and control the stop position of the trolley by observing the position of the school bus and personal experience; this method is greatly affected by the quality of personnel and is uncontrollable. If the lifting height is inappropriate, it will cause the inner tower of the steel coil at least, and at worst, it will damage the mandrel and cause an accident; moreover, it cannot achieve automatic control of uncoiling, which restricts the improvement of the production rhythm. Summary of the Invention

[0003] The purpose of the present invention is to provide a method for calculating the uncoiling height. By installing two rollers on the coil unloading trolley to calculate corresponding data, the lifting height of the coil unloading trolley can be automatically calculated, effectively reducing the labor intensity of workers and labor costs, realizing automatic uncoiling, improving the production rhythm and production efficiency, and effectively solving the above problems existing in the background art.

[0004] The technical solution of the present invention is: a method for calculating the uncoiling height, including the following steps: two rollers are installed on the coil unloading trolley, with a radius of r. The vertical distance between the center of the steel coil and the center line connecting the centers of the two rollers is H1, the distance between the centers of the two rollers is D, and the radius of the steel coil is R. Then the vertical distance h1 between the tangent line of the lower edge of the steel coil and the center line connecting the centers of the two rollers is: h1 = H1 - R; when the coil unloading trolley is in the lower position, the distance between the center line of the mandrel and the center line of the roller is H2; the trolley uncoils in two lifts, and the second lift height is a fixed value h2; the first lift height is: h3 = H2 - R - h1 - h2; H1 is calculated from the radius of the steel coil and the distance between the centers of the two rollers: The first lift height of the coil unloading trolley is obtained as:

[0005] The specific steps are as follows:

[0006] (1) Two rollers are installed on the coil unloading trolley, and the center line connecting the centers of the two rollers is parallel to the ground plane;

[0007] (2) The center line connecting the center of the steel coil and the center of the roller, the center line connecting the centers of the two rollers, and the perpendicular line passing through the center of the steel coil and the center line connecting the centers of the two rollers form a right triangle. According to the right triangle trigonometric function relationship, the formula is obtained:

[0008] (R + r) 2 = H1 2 + D 2 / 4 (Ⅰ)

[0009]

[0010] (4) The vertical distance between the tangent line of the lower edge of the steel coil and the line connecting the centers of the two rollers is

[0011] h1 = H1 - R (Ⅲ)

[0012]

[0013] (6) When the coil unloading trolley is in the low position, the vertical distance between the center line of the roller and the center line of the coiling mandrel is H2, and after the first lift to the in-place position, the vertical distance between the center line of the roller and the center line of the coiling mandrel is H3. Then the first lift height of the coil unloading trolley is:

[0014] h3 = H2 - H3 (Ⅴ)

[0015] (7) When the coil unloading trolley makes the second lift during the positioning of the strip tail, the lift height is h2, and h2 is a fixed value. Then the vertical distance H3 between the center line of the roller and the center line of the coiling mandrel after the first lift of the coil unloading trolley is:

[0016] H3 = R + h1 + h2 (Ⅵ)

[0017] (8) Combining formulas (Ⅳ), (Ⅴ) and (Ⅵ), the first lift height of the coil unloading trolley is:

[0018]

[0019] (9) When the steel coil is on the coiling mandrel, the center of the steel coil coincides with the center of the mandrel.

[0020] The coil unloading trolley unloads the coil in two lifts. The first lift is when the tail of the strip is at a certain distance from the pinch roll, and the second lift is when the tail of the steel coil is positioned.

[0021] The beneficial effects of the present invention are as follows: By installing two rollers on the coil unloading trolley to calculate the corresponding data, the lift height of the coil unloading trolley can be automatically calculated, effectively reducing the labor intensity of workers and the labor cost, and automatic coil unloading can be realized, improving the production rhythm and production efficiency. Description of the Drawings

[0022] Figure 1 is a schematic structural diagram of the present invention;

[0023] Figure 2 is a schematic structural diagram of the two-lift state of the present invention;

[0024] The markings in the figure are as follows: the radius of the roll-off trolley drum is 1, the line connecting the center of the steel coil and the center of the drum is 2, the radius of the steel coil is 3, the steel coil is 4, the perpendicular line from the center of the steel coil to the line connecting the centers of the two drums of the roll-off trolley is 5, the perpendicular distance between the tangent of the lower edge of the steel coil and the line connecting the centers of the two drums is 6, the roll-off trolley drum is 7, the distance between the centers of the two drums of the roll-off trolley is 8, the perpendicular distance between the center line of the mandrel and the center line of the drum when the roll-off trolley is in the lower position is 9, the perpendicular distance between the center line of the drum and the center line of the coiling mandrel after the first lift of the roll-off trolley is 10, the second lift height when the roll-off trolley is positioned at the tail of the strip steel is 11, and the first lift height of the roll-off trolley is 12. Detailed implementation manners

[0025] To make the objectives, technical solutions and advantages of the invention implementation cases clearer, the following will, in conjunction with the attached drawings in the implementation cases, clearly and completely describe the technical solutions in the implementation cases of the present invention. Obviously, the described implementation cases are a small part of the implementation cases of the present invention, rather than all of them. Based on the implementation cases in the present invention, all other implementation cases obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0026] A method for calculating the roll-off height includes the following steps: Two drums are installed on the roll-off trolley, with a radius of r. The perpendicular distance between the center of the steel coil and the line connecting the centers of the two drums is H1, the distance between the centers of the two drums is D, and the radius of the steel coil is R. Then the perpendicular distance h1 between the tangent of the lower edge of the steel coil and the line connecting the centers of the two drums is: h1 = H1 - R; the distance between the center line of the mandrel and the center line of the drum when the roll-off trolley is in the lower position is H2; the roll-off trolley is lifted in two stages during roll-off, and the second lift height is a fixed value h2; the first lift height is: h3 = H2 - R - h1 - h2; H1 is calculated through the radius of the steel coil and the distance between the centers of the two drums: The first lift height of the roll-off trolley obtained is:

[0027]

[0028] The specific steps are as follows:

[0029] (1) Two drums are installed on the roll-off trolley, and the line connecting the centers of the two drums is parallel to the ground plane;

[0030] (2) The line connecting the center of the steel coil and the center of the drum, the line connecting the centers of the two drums, and the perpendicular line passing through the center of the steel coil and the line connecting the centers of the two drums form a right triangle. According to the right triangle trigonometric function relationship, the formula is:

[0031] (R + r) 2 = H1 2 + D 2 / 4 (Ⅰ)

[0032]

[0033] (4) The vertical distance between the tangent line of the lower edge of the steel coil and the line connecting the centers of the two rollers is

[0034] h1 = H1 - R (Ⅲ)

[0035]

[0036] (6) When the uncoiler trolley is at the low position, the vertical distance between the center line of the roller and the center line of the coiling mandrel is H2, and when it is lifted to the first position, the vertical distance between the center line of the roller and the center line of the coiling mandrel is H3. Then the first lifting height of the uncoiler trolley is:

[0037] h3 = H2 - H3 (Ⅴ)

[0038] (7) When the uncoiler trolley makes the second lift during the positioning of the strip tail, the lifting height is h2, and h2 is a fixed value. Then the vertical distance H3 between the center line of the roller and the center line of the coiling mandrel after the first lift of the uncoiler trolley is:

[0039] H3 = R + h1 + h2

[0040] (Ⅵ)

[0041] (8) Combining formulas (Ⅳ), (Ⅴ) and (Ⅵ), the first lifting height of the uncoiler trolley is:

[0042]

[0043] (9) When the steel coil is on the coiling mandrel, the center of the steel coil coincides with the center of the mandrel.

[0044] The uncoiler trolley lifts in two stages when unloading the coil. The first lift is when the tail of the strip is at a certain distance from the pinch roll, and the second lift is when the tail of the steel coil is positioned. This ensures that the trolley can be lifted to the target position in time to press the strip tail after the tail is positioned, improves efficiency, and prevents the uncoiler trolley from rising to the target height in advance and contacting the steel coil, causing wrinkles in the strip.

[0045] The calculation method of the present invention is simple, can automatically calculate the lifting height of the uncoiler trolley, effectively reduces the labor intensity and labor cost of workers, can realize automatic coil unloading, improves the production rhythm and production efficiency, and can well solve the problems in the background.

Claims

1. A method for calculating the coil unloading height, characterized in that It includes the following steps: Install two rollers on the uncoiler trolley, with a radius of r. The vertical distance from the center of the coil to the line connecting the centers of the two rollers is H1, the distance between the centers of the two rollers is D, and the radius of the coil is R. Then the vertical distance h1 from the tangent line of the lower edge of the coil to the line connecting the centers of the two rollers is: h1 = H1 - R; when the uncoiler trolley is in the lower position, the distance between the center line of the mandrel and the center line of the roller is H2; the trolley lifts in two stages during uncoiling, and the second lifting height is a fixed value h2; the first lifting height is: h3 = H2 - R - h1 - h2; H1 is calculated through the coil radius and the distance between the centers of the two rollers: The first lifting height of the uncoiler trolley is obtained as: The specific steps are as follows: (1) Install two rollers on the uncoiler trolley, and the connecting line of the centers of the two rollers is parallel to the ground plane; (2) The connecting line between the center of the steel coil and the center of the roller, the connecting line of the centers of the two rollers, and the perpendicular line passing through the center of the steel coil and the connecting line of the centers of the two rollers form a right triangle. According to the right triangle trigonometric function relationship, the formula is obtained: (R + r) 2 = H1 2 + D 2 / 4 (Ⅰ) (3) (4) The perpendicular distance between the tangent line of the lower edge of the steel coil and the connecting line of the centers of the two rollers is h1 = H1 - R (Ⅲ) (5) (6) When the uncoiler trolley is at the low position, the vertical distance between the center line of the roller and the center line of the coiling mandrel is H2. After the first lift in place, the vertical distance between the center line of the roller and the center line of the coiling mandrel is H3. Then the first lift height of the uncoiler trolley is: h3 = H2 - H3 (Ⅴ) (7) When the uncoiler trolley is positioned at the tail of the strip steel for the second lift, the lift height is h2, and h2 is a fixed value. Then the vertical distance H3 between the center line of the roller and the center line of the coiling mandrel after the first lift of the uncoiler trolley is: H3 = R + h1 + h2 (Ⅵ) (8) Combining formulas (Ⅳ), (Ⅴ) and (Ⅵ), the first lift height of the uncoiler trolley is: (9) When the steel coil is on the coiling mandrel, the center of the steel coil coincides with the center of the mandrel.

2. The uncoiling height calculation method according to claim 1, wherein: The uncoiler trolley uncoils in two lifts. The first lift is when the tail of the strip is at a certain distance from the pinch roll, and the second lift is when the tail of the steel coil is positioned.

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