Coiling machine coil locking pressure control method

Abstract

The invention provides a coiling machine coil locking pressure control method which comprises the following steps: S1, before strip steel coiling is completed, a coil stripping trolley is lifted, and a carrier roller locking system is opened; s2, strip steel coiling correlation coefficients are collected; s3, target strip steel carrier roller locking pressure is calculated based on the strip steel coiling correlation coefficient; s4, after a coiling machine is selected based on the target strip steel carrier roller locking pressure, the pressure is adjusted to the target strip steel carrier roller locking pressure; s5, locking the carrier roller according to the target strip steel carrier roller locking pressure when the strip steel is aligned to the tail to prepare for coil unloading, so that the steel coil is conveyed to a coil unloading system; s6, the steel coil is conveyed to a bundling station, and the coil unloading trolley descends and returns; and S7, the steps S1-S6 are repeated till all the steel coils are discharged. Tension and bending stress required by successful coiling of strip steel correspond to locking force required by a steel coil, corresponding locking system pressure is adopted for strip steel of different specifications, the system load is reduced, the abrasion degree of a locking block is reduced, equipment accidents are reduced, and the production efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of hot-rolled strip steel production technology, and more particularly to a method for controlling the locking pressure of a coiler. Background Technology

[0002] The hot-rolled strip steel production process requires equipment with high stability, and the idler roller locking system plays a crucial role when the coiler completes its coiling task. When the steel coil falls onto the unloading trolley, the idler roller locking system quickly activates to secure the coil, preventing accidents such as coil dropping, equipment damage, and incorrect tail position caused by coil rotation. This ensures the stable transport of the steel coil to the lower coiling system, and its stability and reliability are critical to the coiler's production efficiency and equipment safety.

[0003] Currently, the idler roller locking system of high-strength coilers mainly adapts to the production of high-strength steel by increasing the pressure of the hydraulic system. Specifically, the system pressure is directly used to lock the equipment to meet the coiling requirements of thick and hard strip steel. However, this method suffers from excessively high hydraulic pressure when producing lightweight, thin strip steel, as the pressure is not adjusted accordingly, leading to resource waste and excessive equipment wear.

[0004] Existing locking pressure setting methods have many drawbacks. Hydraulic cylinders and hydraulic pipelines are subjected to high-pressure alternating impacts for extended periods, accelerating wear and shortening their service life; locking blocks experience accelerated wear under high pressure, making them prone to failure; the compact structure of the coiler equipment makes maintenance of the idler roller locking system difficult, further impacting production efficiency and failing to meet the stability and reliability requirements of hot-rolled strip steel production processes. Summary of the Invention

[0005] In view of this, the purpose of this invention is to propose a method for controlling the locking pressure of a coiler, which uses different pressure settings for different specifications of strip steel, reduces the pressure of the locking system while meeting the locking function requirements, increases the service life of hydraulic cylinders and hydraulic pipelines, reduces the wear of locking blocks, reduces equipment accidents and the labor intensity of employees, and improves production efficiency.

[0006] The technical means employed in this invention are as follows: A method for controlling the locking pressure of a winding machine includes the following steps: S1. Before the strip coiling is completed, raise the uncoiling trolley and open the idler roller locking system; S2. Collect the correlation coefficients of the strip steel coil; S3. Calculate the target strip idler roller locking pressure based on the strip coiling correlation coefficient; S4. After selecting the coiler based on the target strip idler roller locking pressure, adjust the pressure to the target strip idler roller locking pressure; S5. When the strip is ready to be uncoiled after the tail is finished, lock the idler rollers according to the target strip idler roller locking pressure so that the steel coil is transported to the lower coiling system. S6. The steel coil is transported to the bundling station, and the unloading trolley descends and returns. S7. Repeat S1~S6 until all steel coils are unloaded.

[0007] Furthermore, the strip coiling correlation coefficient includes the tension required for the strip to complete coiling, the bending stress required for the strip to complete coiling, the strip width, and the strip thickness.

[0008] Furthermore, in S4, S3 specifically includes the following steps: S31. Calculate the minimum locking force for thin and soft limit-specification strip steel; S32. Calculate the minimum locking force for the thickest and hardest strip. S33. Calculate the total force exerted by the coiling system on the strip; S34. The target strip idler roll locking pressure is calculated based on the minimum locking force of thin and soft limit specification strip steel, the minimum locking force of thick and hard limit specification strip steel, and the total force exerted on the strip steel by the coiling system.

[0009] Furthermore, in S31, the formula for calculating the minimum locking force of the thin and soft limit specification strip is as follows:

[0010] Among them, U t1 The tension required to complete the winding of the thin, soft strip; W1 is the width of the thin, soft strip; H1 is the thickness of the thin, soft strip; Y t1 The bending stress required to complete the winding of thin, soft strip steel; In S32, the minimum locking force calculation formula for the thick and hard strip is as follows:

[0011] Among them, U t2 The tension required to complete the winding of the thick, hard strip; W2 is the width of the thick, hard strip; H2 is the thickness of the thick, hard strip; Y t2 The bending stress required to complete the winding of thick, hard strip steel.

[0012] In S33, the formula for calculating the total force exerted by the coiling system on the strip is as follows:

[0013] Among them, U t The tension required to complete the coiling of the target strip; W is the target strip width; H is the target strip thickness; Y t The bending stress required to complete the coiling of the target strip; In S34, the formula for calculating the locking pressure of the target strip idler roller is as follows:

[0014] Where T1 is the safety factor for thin and soft limit specifications of strip steel, and T2 is the safety factor for thick and hard limit specifications of strip steel.

[0015] Furthermore, T1≤T≤T2.

[0016] Furthermore, the thickness of the thin, soft limit strip ranges from 1.2 to 1.8 mm, the width ranges from 1000 to 1500 mm, the yield strength ranges from 150 to 200 MPa, and the final rolling temperature ranges from 700 to 800 °C; the thickness of the thick, hard limit strip ranges from 22 to 26 mm, the width ranges from 1400 to 1800 mm, the yield strength ranges from 750 to 850 MPa, and the final rolling temperature ranges from 300 to 450 °C. The thick, hard limit strip is a high-strength steel.

[0017] Compared with the prior art, the present invention has the following advantages: This invention determines the required locking force of the steel coil based on the tension and bending stress required for successful strip winding. Different specifications of strip steel use corresponding locking system pressures, reducing system load, increasing the service life of hydraulic cylinders and hydraulic pipelines, reducing the wear of locking blocks, reducing equipment accidents and employee labor intensity, and improving production efficiency. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a flowchart of the method of the present invention. Detailed Implementation

[0020] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0021] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0022] like Figure 1 As shown, the present invention provides a method for controlling the locking pressure of a winding machine, comprising the following steps: S1. Before the strip coiling is completed, raise the uncoiling trolley and open the idler roller locking system; S2. Collect strip coiling correlation coefficients; the strip coiling correlation coefficients include the tension required for the strip to complete coiling, the bending stress required for the strip to complete coiling, the strip width, and the strip thickness.

[0023] S3. Calculate the target strip idler roller locking pressure based on the strip coiling correlation coefficient; S31. Calculate the minimum locking force for thin and soft strip steel of the limit specification. The calculation formula is as follows:

[0024] Among them, U t1 The tension required to complete the winding of the thin, soft strip; W1 is the width of the thin, soft strip; H1 is the thickness of the thin, soft strip; Y t1 The bending stress required to complete the winding of thin, soft strip steel; The actual effect was verified by selecting ordinary steel strips with a yield strength of 150-230MPa and a final coiling temperature of 500℃-700℃ for strips with a diameter of 6mm-8mm and a yield strength of 150-230MPa and a final coiling temperature of 50℃-700℃, respectively. If the deviation was large, the bending moment of the coiling machine for this specification of strip steel was calculated using a broken line pressure method.

[0025] This method allows for the verification and improvement of the locking pressure of all types of strip steel to achieve a fully enclosed effect.

[0026] S32. Calculate the minimum locking force for the thickest and hardest strip. The calculation formula is as follows:

[0027] Among them, U t2The tension required to complete the winding of the thick, hard strip; W2 is the width of the thick, hard strip; H2 is the thickness of the thick, hard strip; Y t2 The bending stress required to complete the winding of thick, hard strip steel.

[0028] S33. Calculate the total force exerted by the coiling system on the strip. The calculation formula is as follows:

[0029] Among them, U t The tension required to complete the coiling of the target strip; W is the target strip width; H is the target strip thickness; Y t The bending stress required to complete the coiling of the target strip; The total force exerted on the strip by the coiling system for all types of strip steel should fall between that of thin, soft strip steel and thick, hard strip steel. Based on this, the target strip steel idler roller locking pressure is calculated using a linear function relationship as follows: S34. The target strip idler roller locking pressure is calculated based on the minimum locking force of thin and soft limit specification strip steel, the minimum locking force of thick and hard limit specification strip steel, and the total force exerted on the strip steel by the coiling system. The calculation formula is as follows:

[0030] Where T1 is the safety factor for thin and soft limit specifications of strip steel, and T2 is the safety factor for thick and hard limit specifications of strip steel.

[0031] By conducting production practice verification on the entire specification, N adjustment points can be set to form an N+1-segment linear function correspondence, thereby improving the pressure adjustment curve and compensating for calculation errors.

[0032] S4. After selecting the coiler based on the target strip idler roller locking pressure, adjust the pressure to the target strip idler roller locking pressure. When a coiler is selected, the target strip data will be issued, and we will calculate the idler roller locking pressure according to the strip specifications and adjust it to the correct position simultaneously.

[0033] S5. When the strip is ready to be uncoiled after the tail is finished, lock the idler rollers according to the target strip idler roller locking pressure so that the steel coil is transported to the lower coiling system. S6. The steel coil is transported to the bundling station, and the unloading trolley descends and returns. S7. Repeat S1~S6 until all steel coils are unloaded.

[0034] The thin, soft limit specification strip has a thickness range of 1.2~1.8mm, a width range of 1000~1500mm, a yield strength range of 150~200MPa, and a final rolling temperature range of 700~800℃; the thick, hard limit specification strip has a thickness range of 22~26mm, a width range of 1400~1800mm, and a yield strength range of 750~850MPa. The thick, hard limit specification strip is a high-strength steel.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for controlling the locking pressure of a winding machine, characterized in that, Includes the following steps: S1. Before the strip coiling is completed, raise the uncoiling trolley and open the idler roller locking system; S2. Collect the correlation coefficients of the strip steel coil; S3. Calculate the target strip idler roller locking pressure based on the strip coiling correlation coefficient; S4. After selecting the coiler based on the target strip idler roller locking pressure, adjust the pressure to the target strip idler roller locking pressure; S5. When the strip is ready to be uncoiled after the tail is finished, lock the idler rollers according to the target strip idler roller locking pressure so that the steel coil is transported to the lower coiling system. S6. The steel coil is transported to the bundling station, and the unloading trolley descends and returns. S7. Repeat S1~S6 until all steel coils are unloaded.

2. The winding machine locking pressure control method according to claim 1, characterized in that, The strip coiling correlation coefficients include the tension required for the strip to complete coiling, the bending stress required for the strip to complete coiling, the strip width, and the strip thickness.

3. The winding machine locking pressure control method according to claim 2, characterized in that, In S4, S3 specifically includes the following steps: S31. Calculate the minimum locking force for thin and soft limit-specification strip steel; S32. Calculate the minimum locking force for the thickest and hardest strip. S33. Calculate the total force exerted by the coiling system on the strip; S34. The target strip idler roll locking pressure is calculated based on the minimum locking force of thin and soft limit specification strip steel, the minimum locking force of thick and hard limit specification strip steel, and the total force exerted on the strip steel by the coiling system.

4. The winding machine locking pressure control method according to claim 3, characterized in that, In S31, the minimum locking force calculation formula for the thin and soft limit specification strip is as follows: Among them, U t1 The tension required to complete the winding of the thin, soft strip; W1 is the width of the thin, soft strip; H1 is the thickness of the thin, soft strip; Y t1 The bending stress required to complete the winding of thin, soft strip steel; In S32, the minimum locking force calculation formula for the thick and hard strip is as follows: Among them, U t2 The tension required to complete the winding of the thick, hard strip; W2 is the width of the thick, hard strip; H2 is the thickness of the thick, hard strip; Y t2 The bending stress required to complete the winding of thick, hard strip steel; In S33, the formula for calculating the total force exerted by the coiling system on the strip is as follows: Among them, U t The tension required to complete the coiling of the target strip; W is the target strip width; H is the target strip thickness; Y t The bending stress required to complete the coiling of the target strip; In S34, the formula for calculating the locking pressure of the target strip idler roller is as follows: Where T1 is the safety factor for thin and soft limit specifications of strip steel, and T2 is the safety factor for thick and hard limit specifications of strip steel.

5. The winding machine locking pressure control method according to claim 4, characterized in that, T1≤T≤T2.

6. The winding machine locking pressure control method according to claim 3, characterized in that, The thin, soft limit specification strip has a thickness range of 1.2~1.8mm, a width range of 1000~1500mm, a yield strength range of 150~200MPa, and a final rolling temperature range of 700~800℃; the thick, hard limit specification strip has a thickness range of 22~26mm, a width range of 1400~1800mm, a yield strength range of 750~850MPa, and a final rolling temperature range of 300~450℃. The thick, hard limit specification strip is a high-strength steel.

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