A method for judging the rapid steel throwing of a side pressure width setting machine

Abstract

The invention discloses a method for judging whether a step-by-step side-pressure width-fixing machine is quick to throw steel, comprising the following steps: obtaining the current state of the width-fixing machine; obtaining whether the entrance of the width-fixing machine is in a state of no slab, and obtaining the main drive motor current I of the width-fixing machine within a judgment time T; obtaining the thickness A of the raw material of the slab rolled by the width-fixing machine and the opening degree B of the guide roller at the exit of the width-fixing machine; when the current state of the width-fixing machine is empty, and the width-fixing machine is in a steel-feeding rolling state, and the entrance of the width-fixing machine is in a state of no slab, and within the judgment time T, the main drive motor current I is less than or equal to a current threshold, and the difference between the thickness A of the slab raw material and the actual opening degree B of the guide roller at the exit of the width-fixing machine is greater than or equal to a thickness threshold, then throwing steel is performed, thereby improving the throwing accuracy of the clamping roller at the exit of the width-fixing machine, facilitating the subsequent accurate transmission of the slab, and accurate control of the width of the tail of the slab, thereby ensuring the quality of steel rolling.

Description

Technical Field

[0001] The invention belongs to the technical field of steel rolling technology and relates to a method for judging the rapid steel throwing of a side pressure width setting machine. Background Art

[0002] The side pressure width setting machine is an important width adjustment equipment for hot-rolled strip production lines. At present, the mainstream structural forms of the side pressure width setting machine are divided into step-by-step side pressure type and continuous side pressure type. Among them, the step-by-step side pressure type is the mainstream form of the side pressure width setting machine due to its advantages of low energy consumption and high width adjustment efficiency. The step-by-step side pressure width setting machine mainly controls the slab to walk in the width setting machine step by step through the inlet and outlet pinch rollers of the rolling mill. The steel throwing judgment sequence of the width setting machine generally uses the pressure and roll gap of the outlet pinch roller as the main logical conditions. The outlet pinch roller adopts pressure control. When the tail of the slab leaves the outlet pinch roller of the width setting machine, the outlet pinch roller continues to press down, the roll gap opening becomes smaller, the pressure decreases, and the rolling mill control system determines that the slab leaves the width setting machine, and the roller starts to speed up. Due to the long distance between the side pressure module of the width setting machine and the outlet pinch roller, the slab still crawls in a step-by-step manner during the process from the width setting machine module beating the slab to the tail of the slab being thrown out of the outlet pinch roller of the width setting machine, resulting in reduced rolling efficiency.

[0003] A method for polishing steel of the outlet pinch rollers of a width setting machine, CN201610485464.5, the present invention relates to the field of steel rolling technology, in particular to a method for polishing steel of the outlet pinch rollers of a width setting machine, comprising: obtaining the roller gap value of the outlet pinch rollers, and obtaining the thickness value of the slab; controlling the roller gap value of the outlet pinch rollers to be greater than the thickness of the slab by 30 to 60 mm; feeding the slab into the inlet pinch rollers, and controlling the slab to enter a stop-and-go mode in the width setting machine; when the head of the slab passes the outlet pinch rollers by 0.5 m, controlling the pressure of the outlet pinch rollers to be 200 to 300 KN; and controlling the outlet pinch rollers to polish steel when the rolling force of the outlet pinch rollers is less than 10 to 50 KN and the roller gap value of the outlet pinch rollers is 10 to 50 mm smaller than the thickness of the slab.

[0004] A width setting machine control method, CN201710437462.3, the present invention belongs to the field of hot rolling technology, and discloses a width setting machine control method, which is used for controlling the passage of special-shaped slabs through the width setting machine; it comprises the following steps: when the hot-rolled slab passes through the width setting machine, the lower pinch roller at the outlet of the width setting machine is lifted by 5mm on the basis of the set position; the pressure of the upper pinch roller at the outlet of the width setting machine is increased by 20% or 30% on the basis of the calibrated pressure; after the hot-rolled slab is cast, the upper pinch roller is lifted. The present invention provides a method capable of improving the passability of special-shaped slabs in the width setting machine. In the above-mentioned public patents, the casting state of the width setting machine is judged by the casting of the outlet pinch roller, which is significantly different from the method of judging the casting state by using the difference in the current of the SP main transmission in this patent. Summary of the invention

[0005] In order to solve the above problems, the technical solution adopted by the present invention is: a method for quickly judging steel throwing of a side pressure width setting machine, comprising the following steps:

[0006] Get the current status of the width fixer;

[0007] Get whether there is no slab at the entrance of the width setting machine.

[0008] Obtain the main drive motor current I of the width-fixing machine within the determination time T;

[0009] Obtain the raw material thickness A of the slab rolled by the width setting mill and the opening degree B of the guide roller at the outlet of the width setting mill;

[0010] Based on the main drive motor current I of the width setting machine within the determination time T, determine the relationship between the main drive motor current I of the width setting machine within the determination time T and the current threshold;

[0011] Based on obtaining the thickness A of the slab raw material rolled by the width setting machine and the opening degree B of the guide roller at the outlet of the width setting machine, the relationship between the difference between the thickness A of the slab raw material and the actual opening degree B of the guide roller at the outlet of the width setting machine and the thickness threshold is determined;

[0012] When the current state of the width sizing machine is empty, and the width sizing machine is in the steel feeding rolling state, and there is no slab at the entrance of the width sizing machine, and the main drive motor current I is ≤ the current threshold within the judgment time T, and the difference between the slab raw material thickness A and the actual opening degree B of the guide roller at the outlet of the width sizing machine is ≥ the thickness threshold, steel throwing is performed.

[0013] Furthermore: the method is applicable to a step-type side-pressing width-fixing machine.

[0014] Furthermore, the current threshold ranges from 150A to 250A, and the preferred current threshold is 200A.

[0015] Furthermore, the thickness threshold ranges from 15 mm to 25 mm, and the preferred thickness threshold is 20 mm.

[0016] Furthermore: the main drive motor current I is as follows:

[0017] I=I MAX -I MIN

[0018] I MAX : Maximum value of main transmission current of fixed-width machine within time T.

[0019] I MIN : The minimum value of the main transmission current of the fixed-width machine within the time range T.

[0020] Furthermore: the determination time T is the time consumed for a complete tapping stroke + 0.5 second delay time.

[0021] A device for quickly judging steel throwing of a side pressure width setting machine, comprising:

[0022] Acquisition module I: used to obtain the current status of the width-fixing machine;

[0023] Acquisition module II: used to obtain whether there is no slab at the width setting machine entrance.

[0024] Acquisition module III: used to obtain the main drive motor current I of the width-fixing machine within the determination time T;

[0025] Acquisition module IV: used to obtain the raw material thickness A of the slab rolled by the width setting machine and the opening degree B of the guide roller at the outlet of the width setting machine;

[0026] A judgment module: used for judging the relationship between the main drive motor current I of the width setting machine within the judgment time T and the current threshold value based on the main drive motor current I of the width setting machine within the judgment time T;

[0027] Based on obtaining the thickness A of the slab raw material rolled by the width setting machine and the opening degree B of the guide roller at the outlet of the width setting machine, the relationship between the difference between the thickness A of the slab raw material and the actual opening degree B of the guide roller at the outlet of the width setting machine and the thickness threshold is determined;

[0028] When the current state of the width sizing machine is empty, and the width sizing machine is in the steel feeding rolling state, and there is no slab at the entrance of the width sizing machine, and the main drive motor current I is ≤ the current threshold within the judgment time T, and the difference between the slab raw material thickness A and the actual opening degree B of the guide roller at the outlet of the width sizing machine is ≥ the thickness threshold, steel throwing is performed.

[0029] The present invention provides a method for quickly judging the steel throwing status of a step-by-step side-pressure width-fixing machine, which can reduce the stepping travel time of the slab in the width-fixing machine and improve the production rolling efficiency of the width-fixing machine. It has the following advantages: the steel throwing method of the outlet pinch roller of the width-fixing machine provided in an embodiment of the present invention improves the steel throwing accuracy of the outlet pinch roller of the width-fixing machine, which is beneficial to the subsequent precise transmission of the slab and the precise control of the width of the tail of the slab, thereby ensuring the quality of steel rolling.

[0030] By using this method, it is possible to accurately judge whether the slab has completed side pressure rolling through the main drive current of the width mill and the state of the guide roller. The number of empty shots of the slab in the width mill can be reduced by 3 to 5 times, and the rolling time of the width mill can be reduced by 4 to 7 seconds, which has a good effect on improving the rolling efficiency of the width mill. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0032] Figure 1 It is a schematic diagram of the structure of the width fixing machine equipment. DETAILED DESCRIPTION

[0033] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions 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. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0036] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, the numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be clear that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0037] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention: the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0038] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below their position devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0039] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0040] The steel throwing logic control conditions of the step-type width setting machine are modified and optimized, and the pinch roller gap and pressure judgment conditions are cancelled. The main drive current of the width setting machine and the guide roller gap value of the width setting machine are used as the steel throwing judgment conditions. The specific scheme is as follows:

[0041] A method for judging the rapid steel throwing of a side pressure width setting machine comprises the following steps:

[0042] S1: Get the current status of the width fixing machine;

[0043] S2: Obtain whether there is no slab at the entrance of the width setting machine;

[0044] S3: obtaining the main drive motor current I of the width-fixing machine within the determination time T;

[0045] S4: Obtaining the thickness A of the slab raw material rolled by the width setting machine and the opening degree B of the guide roller at the outlet of the width setting machine;

[0046] S5: Based on the main drive motor current I of the width setting machine within the determination time T, determine the relationship between the main drive motor current I of the width setting machine within the determination time T and the current threshold;

[0047] Based on obtaining the thickness A of the slab raw material rolled by the width setting machine and the opening degree B (actual opening degree) of the guide roller at the outlet of the width setting machine, the relationship between the difference between the thickness A of the slab raw material and the actual opening degree B of the guide roller at the outlet of the width setting machine and the thickness threshold is determined;

[0048] When the current state of the width sizing machine is empty, and the width sizing machine is in the steel feeding rolling state, and there is no slab at the entrance of the width sizing machine, and the main drive motor current I ≤ current threshold within the judgment time T, and the difference between the slab raw material thickness A and the actual opening degree B of the guide roller at the outlet of the width sizing machine ≥ thickness threshold, when all the conditions are met at the same time, steel throwing is performed.

[0049] Steps S1 / S2 / S3 / S4 are executed simultaneously and in parallel. After S1 / S2 / S3 / S4 are executed simultaneously, S5 is executed;

[0050] The obtaining of whether there is no slab at the width setting machine entrance is performed by detecting whether there is no slab at the width setting machine entrance through a hot metal detector signal at the width setting machine entrance;

[0051] Furthermore: the method is applicable to a step-type side-pressing width-fixing machine.

[0052] Further: the current threshold range is: 150-250A, and the preferred current threshold is 200A. According to the motor current fluctuation in the actual operation of the width setting machine, the difference between the maximum and minimum currents of the width setting machine in the rolling state and after the rolling load is about 150A. The setting of 200A is based on increasing the safety factor to avoid disturbances, and 50A is added on the basis of 150A, 150+50=200A;

[0053] Further, the thickness threshold range is 15 mm to 25 mm, and the preferred thickness threshold is 20 mm, which is determined according to the roller gap fluctuation range of the guide rollers during steel rolling in the width setting mill.

[0054] The current I of the main drive motor of the width setting machine meets the requirement of IMAX-IMIN≤200A within the determination time T of the width setting machine hammer head.

[0055] Furthermore: the main drive motor current I is as follows:

[0056] I=I MAX -I MIN

[0057] I MAX : Maximum value of main transmission current of fixed-width machine within time T.

[0058] I MIN: The minimum value of the main transmission current of the fixed-width machine within the time range T.

[0059] Further: the determination time T is the time consumed for a complete tapping stroke + 0.5 second delay time. The hammer action sequence is a close-open-close-open reciprocating motion, and one stroke means the hammer closes and opens once.

[0060] A device for quickly judging steel throwing of a side pressure width setting machine, comprising:

[0061] Acquisition module I: used to obtain the current state of the width setting machine and the width setting machine is in the steel feeding and rolling state;

[0062] Acquisition module II: used to obtain whether there is no slab at the width setting machine entrance.

[0063] Acquisition module III: used to obtain the main drive motor current I of the width-fixing machine within the determination time T;

[0064] Acquisition module IV: used to obtain the raw material thickness A of the slab rolled by the width setting machine and the opening degree B of the guide roller at the outlet of the width setting machine;

[0065] A judgment module: used for judging the relationship between the main drive motor current I of the width setting machine within the judgment time T and the current threshold value based on the main drive motor current I of the width setting machine within the judgment time T;

[0066] Based on obtaining the thickness A of the slab raw material rolled by the width setting machine and the opening degree B of the guide roller at the outlet of the width setting machine, the relationship between the difference between the thickness A of the slab raw material and the actual opening degree B of the guide roller at the outlet of the width setting machine and the thickness threshold is determined;

[0067] When the current state of the width sizing machine is empty, and the width sizing machine is in the steel feeding rolling state, and there is no slab at the entrance of the width sizing machine, and the main drive motor current I is ≤ the current threshold within the judgment time T, and the difference between the slab raw material thickness A and the actual opening degree B of the guide roller at the outlet of the width sizing machine is ≥ the thickness threshold, steel throwing is performed.

[0068] Example 1: To produce a slab with a thickness of 200 mm, the SP width setting machine controls the steel throwing according to the following logic program: When the equipment status of the SP width setting machine satisfies the following conditions at the same time, it is determined that the SP width setting machine has reached the steel throwing state, and the SP width setting machine outlet pinch roller and outlet conveying roller operate at a speed of 1.5 m / s to convey the slab:

[0069] (1) SP empty state is OFF;

[0070] (2) The hot metal detector signal at the SP entrance is OFF;

[0071] (3) The number of beats per minute of the SP module is 42, so one beat cycle of the SP module takes 1.43 seconds, 1.43+0.5=1.53 seconds, and the difference between the maximum and minimum values ​​of the SP main transmission current within 1.53 seconds is less than 200A;

[0072] (4) The difference between the slab thickness and the SP exit guide roller gap is greater than 20 mm, that is, the SP exit guide roller gap is less than 180 mm.

[0073] After adopting the above judgment method, the number of beatings of the SP width-fixing mill is reduced by 4 times, and the rolling time of the SP width-fixing mill is shortened by 1.43*4=5.72 seconds.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements 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 judging the rapid steel throwing of a side pressure width setting machine, characterized in that: The following steps are involved: Get the current status of the width fixer; Get whether there is no slab at the width setting machine entrance. Obtain the main drive motor current I of the width-fixing machine within the determination time T; Obtain the raw material thickness A of the slab rolled by the width setting mill and the opening degree B of the guide roller at the outlet of the width setting mill; Based on the main drive motor current I of the width setting machine within the determination time T, determine the relationship between the main drive motor current I of the width setting machine within the determination time T and the current threshold; Based on obtaining the thickness A of the slab raw material rolled by the width setting machine and the opening degree B of the guide roller at the outlet of the width setting machine, the relationship between the difference between the thickness A of the slab raw material and the actual opening degree B of the guide roller at the outlet of the width setting machine and the thickness threshold is determined; When the current state of the width setting machine is not empty, and the width setting machine is in the steel feeding rolling state, and there is no slab at the entrance of the width setting machine, and the main drive motor current I is less than the current threshold within the judgment time T, and the difference between the slab raw material thickness A and the actual opening degree B of the guide roller at the outlet of the width setting machine is greater than or equal to the thickness threshold, steel throwing is performed; This method is applicable to the step-type side-pressing width-fixing machine; The main drive motor current I is as follows: I= I MAX -I MIN I MAX : Maximum value of the main transmission current of the fixed-width machine within the time range T; I MIN : The minimum value of the main transmission current of the fixed width machine within the time range T; The determination time T is the time consumed by the hammer of the step-type side pressure width setting machine to hit the steel billet for one complete stroke + 0.5 second delay time.

2. According to claim 1, a method for judging the rapid steel throwing of a side pressure width setting machine is characterized by: The current threshold ranges from 150A to 250A, and the preferred current threshold is 200A.

3. According to claim 1, a method for judging the rapid steel throwing of a side pressure width setting machine is characterized in that: The thickness threshold ranges from 15 mm to 25 mm, and the preferred thickness threshold is 20 mm.

4. A device for quickly judging whether a steel is thrown out of a side pressure width setting machine, characterized in that: include: Acquisition module I: used to obtain the current status of the width-fixing machine; Acquisition module II: used to obtain whether there is no slab at the width setting machine entrance. Acquisition module III: used to obtain the main drive motor current I of the width-fixing machine within the determination time T; Acquisition module IV: used to obtain the raw material thickness A of the slab rolled by the width setting machine and the opening degree B of the guide roller at the outlet of the width setting machine; A judgment module: used for judging the relationship between the main drive motor current I of the width setting machine within the judgment time T and the current threshold value based on the main drive motor current I of the width setting machine within the judgment time T; Based on obtaining the thickness A of the slab raw material rolled by the width setting machine and the opening degree B of the guide roller at the outlet of the width setting machine, the relationship between the difference between the thickness A of the slab raw material and the actual opening degree B of the guide roller at the outlet of the width setting machine and the thickness threshold is determined; When the current state of the width setting machine is not empty and the width setting machine is in the steel feeding rolling state, and there is no slab at the entrance of the width setting machine, and the main drive motor current I is less than the current threshold within the judgment time T, and the difference between the slab raw material thickness A and the actual opening degree B of the guide roller at the outlet of the width setting machine is greater than or equal to the thickness threshold, steel throwing is performed; The main drive motor current I is as follows: I= I MAX -I MIN I MAX : Maximum value of the main transmission current of the fixed-width machine within the time range T; I MIN : The minimum value of the main transmission current of the fixed width machine within the time range T; The determination time T is the time it takes for the hammer of the step-type side pressure width setting machine to hit the steel billet once for a complete stroke + 0.5 second delay time; This method is applicable to the step-type side-pressing width-fixing machine.

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