Anti-sliding action optimization control method for hot rolling roll changing trolley

Abstract

The invention belongs to the field of hot rolling mills, and relates to an anti-sliding action optimization control method for a hot rolling roll changing trolley, which can realize anti-sliding in the roll changing process of the roll changing trolley and guarantee smooth roll changing operation. The invention discloses an anti-sliding action optimization control method for a hot rolling roll changing trolley. The roll changing device is applied to one side of a rolling mill housing and comprises a track and a roll changing trolley, and the roll changing trolley is arranged on the track. The anti-sliding action optimization control method for the hot rolling roll changing trolley comprises the steps that the roll changing trolley gets close to the rolling mill housing along the track at a first speed; and the roller changing trolley arrives at a designated position. And when the distance between the roll changing trolley and the rolling mill housing is required to be reduced or kept constant, the roll changing trolley runs towards the rolling mill housing along the track at a second speed. The second speed is smaller than the first speed.

Description

Technical Field

[0001] The invention belongs to the field of hot rolling mills and relates to an optimization control method for preventing a hot rolling roll changing trolley from slipping. Background Art

[0002] In hot rolling production, the working roll surface is subjected to a lot of pressure and wear during the high-intensity rolling process of slabs or strips. Long-term use will lead to problems such as wear of the roll surface and sinking of the roll body, thus affecting the surface quality and precision of the strip. Therefore, when the quality of the strip surface is found to be substandard after a certain rolling amount or a certain amount of rolling, the roll needs to be repaired or replaced.

[0003] Steel rolling requires the dimensional accuracy, reliable quality and long service life of the rollers to ensure the dimensional accuracy, surface finish and mechanical properties of the steel. Timely replacement of damaged or severely sunken rollers can ensure processing efficiency and quality, thereby improving production efficiency. In addition, the increase in rolling speed accelerates the wear of the rollers, making the replacement of rollers more and more frequent. The working rolls of the roughing mill of the 2250 hot rolling mill need to be replaced every 3 days, and the support rolls every 15 days; the working rolls of the finishing mill need to be replaced about every 3 hours, and the support rolls are replaced every 7-15 days; therefore, shortening the roll replacement time is conducive to ensuring product quality, reducing downtime, improving the mill operation rate, increasing production and reducing costs.

[0004] Roughing and finishing roll changing is a normal operation in the hot rolling production process. Ensuring the stable operation of roll changing sequence control and reducing roll changing time have become an important issue for improving quality and efficiency in hot rolling production. After years of operation, various problems are inevitable in the roughing and finishing roll changing trolleys of TISCO 2250 hot rolling mills. After the roll changing trolleys move forward to their positions, they often slip uncontrollably due to the old and worn tracks and uneven levels. Operators need to pay attention at all times and switch to manual mode to intervene in the operation, which seriously affects the roll changing rhythm and generates a lot of downtime. Summary of the invention

[0005] In order to overcome the defects in the above-mentioned related technologies, the present invention proposes an optimization control method for the anti-skidding action of the hot rolling roll changing trolley, which can prevent the roll changing trolley from skidding during the roll changing process and ensure the smooth progress of the roll changing operation.

[0006] To achieve the above technical objectives, the present invention provides a hot rolling roll changing trolley anti-slipping action optimization control method. The roll changing device is applied to one side of the rolling mill arch, and the roll changing device includes: a track and a roll changing trolley, and the roll changing trolley is arranged on the track.

[0007] The method for optimizing the anti-skid action of a hot rolling roll-changing trolley comprises: the roll-changing trolley approaches the mill arch along the track at a first speed. The roll-changing trolley gets off the track and reaches a specified position. When the distance between the roll-changing trolley and the mill arch is required to be reduced or kept constant, the roll-changing trolley runs toward the mill arch along the track at a second speed. The second speed is less than the first speed.

[0008] Preferably, after the roll-changing trolley arrives at the designated position, the hot rolling roll-changing trolley anti-skid action optimization control method further comprises: judging the state of the working roll door lock plate on the mill arch. If the working roll door lock plate is in an unlocked state, the roll-changing trolley has the premise of running toward the mill arch. If the working roll door lock plate is in a locked state, the roll-changing trolley stops running toward the mill arch.

[0009] Preferably, when the roll-changing trolley is farthest from the rolling mill arch, the distance between the roll-changing trolley and the rolling mill arch is divided into 13 to 16 equal parts. The designated position includes a distance of 1 or 2 equal parts from the rolling mill arch.

[0010] Preferably, the second speed is 0.04 m / s to 0.08 m / s.

[0011] The beneficial effects of the present invention are: According to the present invention, during the roll changing process, the roll changing trolley runs towards the rolling mill arch at the second speed. When the track is old and worn out and causes slipping and breaking, the roll changing trolley can maintain the trend of running towards the rolling mill arch to avoid slipping and breaking. In addition, after the roll changing trolley collides with the working roll door lock plate of the rolling mill arch, although the roll changing trolley stops running and there is no slipping and breaking, and pressure can be continuously applied to the working roll door lock plate, which on the one hand ensures the smooth roll changing and on the other hand facilitates the opening of the locking mechanism of the working roll door lock plate.

[0012] Other beneficial effects of the present invention are described in detail in conjunction with the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 It is a structural diagram of the present invention; Figure 2 A strategy diagram for roller replacement according to the present invention. DETAILED DESCRIPTION

[0015] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in 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 creative work belong to the scope of protection of the present invention.

[0016] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0017] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0018] like Figure 1 and Figure 2 As shown, the present invention provides an optimization control method for preventing a hot rolling roll changing trolley 2 from slipping. The roll changing device is applied to one side of a rolling mill arch, and the roll changing device comprises: a track 1 and a roll changing trolley 2, and the roll changing trolley 2 is arranged on the track 1.

[0019] The optimization control method for the anti-skid action of the hot rolling roll changing trolley 2 includes: S1. The roll-changing trolley 2 approaches the rolling mill arch along the track 1 at a first speed.

[0020] S2, the roller changing vehicle gets off the vehicle and arrives at a designated position.

[0021] S3. When the distance between the roll-changing trolley 2 and the rolling mill housing is required to be reduced or kept constant, the roll-changing trolley 2 runs along the track 1 toward the rolling mill housing at a second speed.

[0022] The second speed is lower than the first speed.

[0023] Preferably, after the roll-changing trolley 2 arrives at the designated position, the hot rolling roll-changing trolley 2 anti-slipping action optimization control method further includes step S21.

[0024] S21. Determine the status of the working roll door lock plate on the rolling mill arch.

[0025] S22. If the working roll door lock plate is in an unlocked state, the roll changing trolley 2 has the prerequisite to run toward the rolling mill.

[0026] S23. If the working roll door lock plate is in a locked state, the roll changing trolley 2 stops running toward the rolling mill arch.

[0027] Preferably, when the roll-changing trolley 2 is farthest from the rolling mill arch, the distance between the roll-changing trolley 2 and the rolling mill arch is divided into 13 to 16 equal parts. The designated position includes a distance of 1 or 2 equal parts from the rolling mill arch.

[0028] Preferably, the second speed is 0.04 m / s to 0.08 m / s.

[0029] For example, the 2250 hot rolling mill uses a push-pull electric roll-changing trolley 2, which is composed of a DC motor, a clutch, a reducer and a sprocket, and is engaged with a fixed chain fixed on the middle deck of the two tracks 1, thereby driving the roll-changing trolley 2 to move forward and backward on the track 1. The push-pull electric roll-changing trolley 2 is equipped with a pneumatic lock hook to hook the working roll bearing seat. A guide wheel is also provided to play a side guide role.

[0030] The moving distance of the push-pull electric roll-changing trolley 2 is fed back by a multi-turn absolute encoder installed on the middle shaft of the reducer. The position marks of the multi-turn absolute encoder are E1 to E14, and the corresponding E1 is the farthest distance between the push-pull electric roll-changing trolley 2 and the rolling mill arch, and E14 is the shortest distance between the push-pull electric roll-changing trolley 2 and the rolling mill arch.

[0031] The maximum position E14 is reached when the roll changing trolley 2 reaches one of these positions, and its movement will be mechanically stopped. This is a necessary interlock to protect the mechanical damage of the equipment. In this application, whether the roll changing trolley 2 is supported and advanced is determined by the open or closed state of the working roll lock door.

[0032] For example, the anti-slip control technology of the roughing and finishing rolling roll changing trolley 2 uses the following algorithm: (1) When the roll-changing sequence executes the large step of roll dropping, the roll-changing trolley 2 advances to the E14 forward position, the position feedback of the roll-changing trolley 2 is ≥ E13 (33632 mm), and the lower working roll lock door plate is not opened, the anti-slip function of the roll-changing trolley 2 is activated, that is, the roll-changing trolley 2 is judged to continue to advance a small given speed at this position, the speed is 0.06 m / s, until the lower working roll inlet and outlet lock door plates are all opened, and the forward given speed of the roll-changing trolley 2 is reduced to 0 m / s.

[0033] (2) When the roll changing sequence is executed to the large step of roll withdrawal, the roll changing trolley 2 advances to the E12 forward position, the position feedback of the roll changing trolley 2 is ≥E12 (33585mm), and the upper working roll lock door is not opened, the anti-slip function of the roll changing trolley 2 is activated, that is, it is determined that the roll changing trolley 2 continues to advance a small given speed at this position, the speed is 0.06m / s, until the upper working roll inlet and outlet lock door are fully opened, and the forward given speed of the roll changing trolley 2 is reduced to 0m / s.

[0034] (3) When the roll-changing sequence is executed to the roll loading step, the roll-changing trolley 2 advances to the E13 forward position, the position feedback of the roll-changing trolley 2 is ≥E13 (33632mm), and the upper working roll lock door plate is not locked, the roll-changing trolley 2 anti-skid function is activated, that is, it is determined that the roll-changing trolley 2 continues to hold a small forward setting at this position, the speed is 0.06m / s, until the upper working roll inlet and outlet lock door plates are all locked, and the forward setting speed of the roll-changing trolley 2 is reduced to 0m / s; when the roll-changing trolley 2 advances to the E14 forward position, the position feedback of the roll-changing trolley 2 is ≥E13 (33632mm), and the lower working roll lock door plate is not locked, the roll-changing trolley 2 anti-skid function is activated, it is determined that the roll-changing trolley 2 continues to hold a small forward setting at this position, the speed is 0.06m / s, until the lower working roll inlet and outlet lock door plates are all locked, and the forward setting speed of the roll-changing trolley 2 is reduced to 0m / s.

[0035] When the roll-changing trolley 2 moves forward to the right position, the position of the roll-changing trolley 2 and the open / closed state of the working roll lock door plate are used to determine the forward positioning of the roll-changing trolley 2, which solves the problem that the roll-changing trolley 2 often slips uncontrollably when the track 1 is old, worn and uneven, causing the operator to pay attention at all times and switch to manual mode to intervene in the operation from time to time, which seriously affects the roll-changing rhythm and generates a lot of downtime. The stable operation of the action sequence of the roll-changing trolley 2 during normal roll changing is ensured.

[0036] In the present application, the output power of the DC motor of the roll changing trolley 2 is 90KW. After many experiments, when the DC motor drives the roll changing trolley 2 to feed at 0.06m / s, the roll changing trolley 2 can be prevented from slipping. At the same time, after the roll changing trolley 2 hits the rolling mill arch, during the time period of completing the operation of clamping the working roll bearing seat and realizing the change of direction of the DC motor, the covered time period is generally 450s~700s, and the DC motor will not cause excessive heat and burn out.

[0037] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0038] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A hot rolling roll changing trolley anti-skidding action optimization control method, applied to a roll changing device on one side of a rolling mill arch, the roll changing device comprising: A track and a roller changing trolley, wherein the roller changing trolley is arranged on the track; The method for optimizing the control of the anti-skidding action of the hot rolling roll changing trolley comprises: The roll-changing trolley approaches the rolling mill arch along the track at a first speed; The roller changing vehicle gets off the vehicle and arrives at a designated position; When the distance between the roll-changing trolley and the rolling mill arch is required to be reduced or kept constant, the roll-changing trolley runs along the track toward the rolling mill arch at a second speed; The second speed is lower than the first speed.

2. The hot rolling roll changing trolley anti-skid action optimization control method according to claim 1 is characterized in that: After the roll-changing trolley arrives at the designated position, the hot rolling roll-changing trolley anti-skid motion optimization control method further comprises: judging the state of the working roll door lock plate on the rolling mill arch; If the working roll door lock plate is in an unlocked state, the roll changing trolley has the prerequisite to run toward the rolling mill arch; If the working roll door lock plate is in a locked state, the roll changing trolley stops running toward the rolling mill arch.

3. The hot rolling roll changing trolley anti-skid motion optimization control method according to claim 3 is characterized in that: When the roll-changing trolley is farthest from the rolling mill arch, the distance between the roll-changing trolley and the rolling mill arch is divided into 13 to 16 equal parts; The designated location includes a distance of 1 or 2 equal parts from the rolling mill arch.

4. The hot rolling roll changing trolley anti-skid motion optimization control method according to claim 4 is characterized in that: The second speed is 0.04m / s~0.08m / s.

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