Interlock control method for preventing steel accumulation in high speed area equipment

Abstract

The application discloses a cascaded control method for preventing steel blocking in high-speed area equipment, measures the distance between two groups, calculates the exit line speed of the last mill of the former group by the exit line speed of the second last mill of the former group and the extension coefficient of the last mill of the former group, calculates the running time of the red steel from the former group to the latter group by the distance between the two groups and the exit line speed of the last mill of the former group, calculates the steel blocking control time of the red steel, compares the actual running time of the red steel with the steel blocking control time to determine whether the steel blocking will occur in advance. The application can break the red steel before the red steel damages the roll ring, controls the steel blocking before the equipment is damaged, and effectively prevents the damage of the rolling mill group.

Description

Technical Field

[0001] This invention relates to an interlocking control method, particularly an interlocking control method for preventing steel blockage in high-speed equipment, belonging to the field of steel rolling technology. Background Technology

[0002] High-speed bar mills are advanced, precise, and fast-rolling lines with long high-speed sections and numerous pieces of equipment. If a steel jam occurs, it results in lengthy processing times and equipment damage. High-speed bar mills are highly automated, requiring high accuracy in signals, especially heat detection signals. Currently, the most common signal for steel jams is whether the steel line inside the mill has broken. When the red-hot steel exits the roller table, it will break the steel line, providing a signal to the shearing unit for cutting. This is the commonly used signal for handling steel jam accidents. However, this signal is actually of no benefit to the equipment and fails to protect it. Steel jams occurring within the rolling mill can cause cracks in equipment such as the rolling rings (each mill stand has two rolling rings, and a typical mill unit has 2-6 mill stands), resulting in significant losses. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a method for preventing steel blockage in high-speed equipment through interlocking control, thereby controlling steel blockage before it may damage the equipment.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0005] A method for interlocking control to prevent steel blockage in equipment in high-speed zones, characterized by comprising the following steps:

[0006] S1. Measure the distance S between the last stand of the previous unit and the first stand of the next unit;

[0007] S2, Obtain the exit linear velocity v of the second-to-last stand of the previous unit's rolling mill. n-1 The elongation coefficient q of the last stand of the previous unit;

[0008] S3, the linear velocity v at the exit of the second-to-last stand of the preceding unit. n-1 The exit linear velocity v of the last stand of the previous unit is calculated from the elongation coefficient q of the last stand of the previous unit. n =V n-1 *q;

[0009] S4, the distance S between the last stand of the preceding unit and the first stand of the following unit, and the exit linear velocity v of the last stand of the preceding unit. n Calculate the running time t0 of the red steel from the previous unit to the next unit: t0 = S / V n ;

[0010] S5, calculate the red steel holding control time t1=t0*p through the running time t0 of the red steel from the former group to the latter group, wherein p is an empirical correction coefficient;

[0011] S6, the red steel actually running time t5=t4-t2 is calculated through the former group last rack mill biting steel time t2, the latter group first rack mill biting steel time t3 and the red steel running current time t4;

[0012] S7, compare the red steel actually running time t5 with the red steel holding control time t1, if t5≥t1, it is determined that the two groups hold steel, the segment between the groups is cut and the red steel is broken, if t5<t1, it is normal.

[0013] Further, the distance S between the former group last rack mill and the latter group first rack mill in the step S1 is the transmission distance of the red steel between the former group last rack mill and the latter group first rack mill.

[0014] Further, in the step S2, the extension coefficient q of the former group last rack mill is directly obtained through the rolling parameter table, or is calculated through the rolling section area s n-1 of the penultimate rack mill of the former group and the rolling section area s n of the former group last rack mill. n-1 / s n .

[0015] Further, in the step S5, the actual running time t6=t3-t2 of the red steel without holding steel is recorded when the red steel is rolled from the former group to the latter group, a red steel actually running time data set is established through a plurality of groups of the actual running time t6 of the red steel without holding steel, the red steel actually running time data set is screened and cleaned, and then the empirical correction coefficient p is determined according to the data distribution of the red steel actually running time data set.

[0016] Further, in the step S7, the biting steel time t2 of the former group last rack mill and the biting steel time t3 of the latter group first rack mill are obtained in the following manner: the rollers of the former group last rack mill are powered on, when the former group last rack mill bites steel, the rollers are connected and the current suddenly rises, the time is recorded as the biting steel time t2 of the former group last rack mill, the rollers of the latter group first rack mill are powered on, when the latter group first rack mill bites steel, the rollers are connected and the current suddenly rises, the time is recorded as the biting steel time t3 of the latter group first rack mill.

[0017] Compared with the prior art, the application has the following advantages and effects: the application provides a cascading control method for preventing steel blocking in high-speed area equipment, which judges whether steel blocking will occur by judging the actual running time of red steel between two rolling mill sets and the theoretical running time, and determines whether steel blocking will occur in sequence, so that the red steel can be broken before the roll ring is damaged, the steel blocking is controlled before the equipment is damaged, and the damage of the rolling mill set is effectively prevented. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a flow chart of an embodiment of the cascading control method for preventing steel blocking in high-speed area equipment. DETAILED DESCRIPTION

[0019] In order to describe the technical solutions adopted by the application in detail and achieve the predetermined technical purposes, the technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application, and the technical means or technical features in the embodiments of the application can be replaced without creative labor. The application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0020] As shown in Figure 1 , the cascading control method for preventing steel blocking in high-speed area equipment comprises the following steps:

[0021] S1, measure the distance S between the last mill of the previous mill set and the first mill of the next mill set. The distance S between the last mill of the previous mill set and the first mill of the next mill set is the transmission distance of the red steel between the last mill of the previous mill set and the first mill of the next mill set.

[0022] S2, obtain the exit line speed v n-1 of the second last mill of the previous mill set and the extension coefficient q of the last mill of the previous mill set. The extension coefficient q of the last mill of the previous mill set is directly obtained from a rolling parameter table, or is calculated by the rolling cross-sectional area s n-1 of the second last mill of the previous mill set and the rolling cross-sectional area s n of the last mill of the previous mill set. n-1 n .

[0023] S3, calculate the exit line speed v n-1 of the last mill of the previous mill set by the exit line speed v n ​=V n-1 *q.

[0024] S4, the distance S between the last mill of the former group and the first mill of the latter group and the outlet line speed v of the last mill of the former group are obtained n The running time t0 of the red steel from the former group to the latter group is calculated as S / V n .

[0025] S5, the red steel hold-up control time t1 is calculated as t0*p, where p is an empirical correction coefficient, based on the running time t0 of the red steel from the former group to the latter group.

[0026] The empirical correction coefficient p is obtained as follows: when the red steel is being rolled, the actual running time t6 of the red steel without hold-up from the former group to the latter group is recorded, a plurality of sets of the actual running time t6 of the red steel without hold-up from the former group to the latter group are recorded, a data set of the actual running time of the red steel without hold-up is established, the data set of the actual running time of the red steel without hold-up is screened to remove invalid data with obvious errors, and then the empirical correction coefficient p is determined according to the data distribution of the data set of the actual running time of the red steel without hold-up.

[0027] S6, the red steel biting time t2 of the last mill of the former group, the red steel biting time t3 of the first mill of the latter group, the current time t4 of the red steel, and the actual running time t5 of the red steel are obtained as t4-t2.

[0028] S7, the actual running time t5 of the red steel is compared with the red steel hold-up control time t1, if t5≥t1, it is determined that the red steel is held up between the two groups, and the red steel is cut off, if t5

[0029] The red steel biting time t2 of the last mill of the former group and the red steel biting time t3 of the first mill of the latter group are obtained as follows: the rollers of the last mill of the former group are powered, when the last mill of the former group bites, the rollers are connected, the current suddenly rises, and the time is recorded as the red steel biting time t2 of the last mill of the former group, the rollers of the first mill of the latter group are powered, when the first mill of the latter group bites, the rollers are connected, the current suddenly rises, and the time is recorded as the red steel biting time t3 of the first mill of the latter group.

[0030] The application provides a cascaded control method for preventing steel blocking in high-speed area equipment, which judges whether steel blocking will occur by judging the actual running time of red steel between two rolling mill groups and the theoretical running time, and determines whether steel blocking will occur. Since red steel blocking is usually caused by red steel head deflection, when steel blocking occurs, the actual running time will be greater than the theoretical running time due to red steel head deflection, and the determination of whether steel blocking will occur can break the red steel before the red steel damages the roll ring, controls the steel blocking before the equipment is damaged, and effectively prevents the damage of the rolling mill group.

[0031] The application will be further described below through specific examples.

[0032] A cascaded control method for preventing steel blocking in high-speed area equipment is used for Φ12mm HRB400 straight thread steel process, and includes the following steps:

[0033] The distance between the last mill of the previous mill group and the first mill of the next mill group is measured, and the distance between the outlet of the 17-mill pre-rolling mill group (i.e. the last mill) and the first mill of the 2p mill group (composed of two mills) on the process layout is (36.391m-12.803m)+12.803 / sin65°=48. The distance between the last mill of the 2p mill group and the first mill of the 4p mill group is 118.2m.

[0034] The red steel movement time from the previous mill group to the next mill group is calculated at the normal process line speed through the rolling parameter table, the outlet speed of the 17-mill is 16.22m / s, the outlet speed of the 2p mill group is 25.4m / s, and a correction coefficient is added according to experience considering the large impact of stacking and pulling (the distance between the mill groups is long), wherein the correction coefficient between the last 17-mill of the pre-rolling mill group and the 2p mill group is 1.03, the red steel movement time is corrected to 48.7m / 16.22 / 1.03=2915ms, the correction coefficient between the 2p mill group and the 4p mill group is 1.07, and the movement time between the 2p mill group and the 4p mill group is corrected to 118.2 / 25.4 / 1.07=4349ms.

[0035] Several important signals, the last mill of the mill group bites steel signal (the current rises sharply after biting steel), the first mill of the next mill group bites steel signal (the current rises sharply after biting steel), and the broken shear broken signal (one is the main control platform forced broken, and the other is that the biting steel time interval exceeds the set time). The actual running time t 5a of the red steel between the last 17-mill of the pre-rolling mill group and the 2p mill group of the mill group 5b .

[0036] When t 5a≥ 2915ms, the red steel between the last 17 stands of the pre-finishing rolling mill group and the mill 2p group is cut by the cutting device. When the first bite signal of the mill 2p group is collected, the red steel between the last 17 stands of the pre-finishing rolling mill group and the mill 2p group is normally passed.

[0037] When t 5b ≥ 4349ms, the red steel between the mill 2p group and the mill 4p group is cut by the cutting device. When the first bite signal of the mill 4p group is collected, the red steel between the mill 2p group and the mill 4p group is normally passed.

[0038] The above description is only the preferred embodiment of the present application, and is not intended to limit the present application in any form. Although the present application has been disclosed as above with the preferred embodiment, it is not intended to limit the present application. Any skilled person in the art can make some changes or modifications to the above disclosed technical content without departing from the technical solution of the present application, and the equivalent embodiments with equivalent changes are equivalent to the embodiments. However, any simple modification, equivalent replacement and improvement of the above embodiments, which do not depart from the technical solution of the present application and are within the spirit and principle of the present application, are still within the protection scope of the present application.

Claims

1. A cascading control method for preventing steel accumulation in a high speed area device, characterized by The method comprises the following steps: S1, measuring the distance S between the last mill of the former group and the first mill of the latter group; S2, acquiring the last but one mill outlet line speed v of the previous mill train n-1 , the extension coefficient q of the last mill of the previous mill train; S3, calculate the exit line speed v of the last mill in the previous mill train by the exit line speed v of the second last mill in the previous mill train and the elongation coefficient q of the last mill in the previous mill train n-1 = v n = v n-1 *q; S4, the distance S between the last stand of the previous group and the first stand of the next group and the exit line speed v of the last stand of the previous group n The running time t0of the red steel from the previous group to the next group is calculated as S / V n ; S5, calculating the red steel holding time t1=t0*p by the running time t0 of the red steel from the former group to the latter group, wherein p is an empirical correction coefficient; S6, the red steel running current time t4, the red steel actual running time t5=t4-t2; S7, comparing the red steel actual running time t5 with the red steel holding time t1, if t5≥t1, it is determined that the red steel is held between the two groups, the red steel is cut off by the inter-group clamp section, if t5<t1, the red steel is normally passed.

2. A cascading control method for preventing a steel blow in a high speed area facility according to claim 1, characterized in that: The distance S between the last mill of the former group and the first mill of the latter group in the step S1 is the transmission distance of the red steel between the last mill of the former group and the first mill of the latter group.

3. The interlock control method for preventing a steeling-up in a high-speed area device according to claim 1, characterized by: In the step S2, the extension coefficient q of the last mill of the previous mill train is obtained directly from the rolling parameter table, or through the rolling sectional area s of the second last mill of the previous mill train n-1 and the rolling sectional area s of the last mill of the previous mill train n The extension coefficient q = s n-1 / s n is calculated.

4. The interlock control method for preventing a steeling-up in a high-speed area device according to claim 1, characterized by: In the step S5, the empirical correction coefficient p is obtained as follows: when the red steel is rolled, the actual running time t6=t3-t2 of the red steel without holding is recorded, a plurality of actual running times t6 of the red steel without holding are recorded, a data set of the actual running time of the red steel without holding is established, the data set is screened and cleaned, and the empirical correction coefficient p is determined according to the data distribution of the data set.

5. The interlock control method for preventing a steeling-up in a high-speed area device according to claim 1, characterized by: In the step S7, the time of the steel biting time t2 of the last mill of the former group and the steel biting time t3 of the first mill of the latter group is obtained as follows: the rollers of the last mill of the former group are electrified, when the last mill of the former group bites the steel, the rollers are connected, the current suddenly rises, and the time is recorded as the steel biting time t2 of the last mill of the former group; the rollers of the first mill of the latter group are electrified, when the first mill of the latter group bites the steel, the rollers are connected, the current suddenly rises, and the time is recorded as the steel biting time t3 of the first mill of the latter group.

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