A method and system for automatic control of the billet rolling rhythm

Abstract

The present invention discloses a method and system for automatically controlling the billet rolling rhythm, including: establishing a control program, setting a man-machine dialogue window on the main control screen, setting and reading the interval time of rolling steel; using a first metal detector to control the conveying of billets in the heating furnace according to the steel demand signal sent by a second hot metal detector; performing billet start control through the steel throwing signal sent by the first rolling mill, and judging whether to use the second hot metal detector to send a steel demand signal to the heating furnace according to whether continuous rolling is carried out; comparing the rolling interval time of two billets with the set rolling interval time, and performing furnace roller table linear speed control to keep the rolling steel rhythm stable at the set rolling interval time. The present invention explores to exert the maximum working efficiency of the rolling mill by setting the rolling interval time, reduces production costs; has a stable rolling steel rhythm, reduces equipment failures; improves the working efficiency of the personnel in the production department, reduces the labor intensity of the operators; and improves the automatic control level of the production line.

Description

Technical Field

[0001] The present invention relates to the technical field of automatic control of bar and wire rod rolling, and particularly to a method and system for automatically controlling the rhythm of bloom rolling. Background Art

[0002] It has always been a difficult point to keep the rhythm of bar and wire rod rolling compact and stable. At present, the lengths of steel billets are sometimes different, and the operators do not know the rolling time of each steel billet. If the tapping time interval is too short, the steel signals between rolling mills cannot be separated clearly, resulting in steel piling up; if the tapping time interval is too long, it will affect the rolling output, reduce the production efficiency and increase the cost. At present, the tapping time interval is manually controlled. Originally, the operators mainly started tapping when observing that the tail of the steel billet on the discharging roller table reached a certain place, and the operators needed to be highly concentrated. In order to improve the work efficiency of the production department personnel, reduce the labor intensity of the production department personnel, and make the equipment operate stably and achieve the maximum efficiency, it is very necessary to explore a new control method. Summary of the Invention

[0003] The purpose of this part is to outline some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this part, as well as in the abstract and title of the specification of this application, to avoid obscuring the purpose of this part, the abstract and the title. However, such simplifications or omissions shall not be used to limit the scope of the present invention.

[0004] In view of the above existing problems, the present invention is proposed.

[0005] Therefore, the purpose of the present invention is to provide a method for automatically controlling the rhythm of bloom rolling.

[0006] To solve the above technical problems, the present invention provides the following technical solutions:

[0007] In a first aspect, an embodiment of the present invention provides a method for automatically controlling the rhythm of bloom rolling, including:

[0008] Establish a control program, set a man-machine dialogue window on the main control screen, and set and read the rolling interval time;

[0009] Use a first metal detector to control the conveying of steel billets in the heating furnace according to the steel demand signal sent by a second hot metal detector;

[0010] Control the start of the steel billet through the steel throwing signal sent by the No. 1 rolling mill, and judge whether to use the second hot metal detector to send a steel demand signal to the heating furnace according to whether continuous rolling is carried out;

[0011] Compare the rolling interval time of two steel billets with the set rolling interval time, and control the linear speed of the furnace roller table to keep the rolling rhythm stable at the set rolling interval time.

[0012] As an automatic control method for the billet rolling rhythm according to the present invention, wherein: the first metal detector is used to control the billet conveying in the heating furnace according to the steel demand signal sent by the second hot metal detector, including that when the heating furnace receives the steel demand command, the outgoing steel roller table and the furnace outlet roller table in the heating furnace are started, and the billet is conveyed from the heating furnace to the furnace outlet roller table.

[0013] As an automatic control method for the billet rolling rhythm according to the present invention, wherein: when the tail of the billet passes through the first hot metal detector, the outgoing steel roller table in the heating furnace stops, including

[0014] The calculation formula for the linear velocity of the furnace outlet roller table is as follows:

[0015] V1 = π * D * n / 60i

[0016] Wherein, D is the roller diameter of the roller table, n is the rated speed of the motor, and i is the reduction ratio of the speed reducer;

[0017] The calculation formula for the acceleration of the furnace outlet roller table is as follows:

[0018] a = ΔV / Δt = (V1 - V0) / (t1 - t0) = V1 / t1

[0019] Wherein, V1 is the linear velocity of the furnace outlet roller table, i.e., the normal operating speed of the roller table, t1 is the deceleration time and is based on the number of seconds set by the frequency converter, ΔV is the speed change, and Δt is the time interval.

[0020] As an automatic control method for the billet rolling rhythm according to the present invention, wherein: the billet start control is carried out through the steel throwing signal sent by the No. 1 rolling mill, including

[0021] If the No. 1 rolling mill sends a steel throwing signal, the billet on the furnace outlet roller table continues to move forward and is bitten into the No. 1 rolling mill;

[0022] If the No. 1 rolling mill sends a steel presence signal, the billet will automatically stop in front of the No. 1 rolling mill and wait, including:

[0023] The distance traveled by the billet when its head reaches the No. 2 metal detector and then decelerates and stops after a time delay is as follows:

[0024] S1 = V1t2 + 1 / 2at2 2

[0025] Wherein, t2 is the program-set time delay. According to the calculation result of the above formula S1 and the distance S2 between the hot metal detector and the No. 1 rolling mill, the billet stops on the furnace outlet roller table at a distance x = S2 - S1 from the No. 1 rolling mill and waits.

[0026] As an automatic control method for the billet rolling rhythm according to the present invention, wherein: it further includes

[0027] If the first rolling mill emits a signal indicating that the previous billet has been discharged, it will stop in front of the first rolling mill and wait for the billet to start again, then move forward until it bites into the first rolling mill.

[0028] The time for uniformly biting into the rolling mill is calculated as follows:

[0029] t3 = (S3) / V1 = (x - 1 / 2at2 2 ) / V1

[0030] According to the above formula, the total time t4 for the billet to start and run until it bites into the rolling mill is t4 = t1 + t3, and it is adjusted according to the actual application situation.

[0031] As a method for automatically controlling the rhythm of bloom rolling according to the present invention, wherein: judging whether to use the second hot metal detector to send a steel demand signal to the heating furnace according to whether continuous rolling is performed includes that if the billet bites into the first rolling mill and when the tail passes through the second hot metal detector on the discharging roller table, a steel demand signal is sent to the heating furnace after a delay time.

[0032] As a method for automatically controlling the rhythm of bloom rolling according to the present invention, wherein: controlling the linear speed of the furnace roller table by comparing the rolling interval time of two billets and the set rolling interval time includes,

[0033] Calculating the linear speed of the discharging roller table by setting the rolling interval time;

[0034] If the set rolling interval time < the rolling interval time of two billets, the linear speed of the discharging roller table is increased;

[0035] If the set rolling interval time > the rolling interval time of two billets, the linear speed of the discharging roller table is decreased.

[0036] In a second aspect, an embodiment of the present invention provides a system for automatically controlling the rhythm of bloom rolling, including,

[0037] A setting and reading module, used to establish a control program, set a man-machine dialogue window on the main control screen, and set and read the rolling interval time;

[0038] A control module, which uses the first metal detector to control the feeding of billets to the heating furnace according to the steel demand signal sent by the second hot metal detector, controls the starting of billets through the discharging signal sent by the first rolling mill, and judges whether to use the second hot metal detector to send a steel demand signal to the heating furnace according to whether continuous rolling is performed;

[0039] A measurement module, used to compare the rolling interval time of two billets and the set rolling interval time, and control the linear speed of the furnace roller table to keep the rolling rhythm stable at the set rolling interval time.

[0040] In a third aspect, an embodiment of the present invention provides a computing device, including:

[0041] a memory and a processor;

[0042] The memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions. When the one or more programs are executed by the one or more processors, the one or more processors implement the bloom rolling rhythm automatic control method as described in any embodiment of the present invention.

[0043] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, which stores computer-executable instructions. When the computer-executable instructions are executed by a processor, the bloom rolling rhythm automatic control method is implemented.

[0044] Advantages of the present invention: By setting the rolling interval time, exploring and giving full play to the maximum working efficiency of the rolling mill, reducing production costs; stable rolling rhythm, reducing equipment failures; improving the work efficiency of production department personnel, reducing the labor intensity of operators; improving the automatic control level of the production line. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. Among them:

[0046] Figure 1 It is a schematic diagram of the overall structure of a bloom rolling rhythm automatic control method of the present invention.

[0047] Figure 2 It is a program segment diagram for setting the tapping time of a bloom rolling rhythm automatic control method of the present invention.

[0048] Figure 3 It is a program segment diagram for controlling the tapping of the reheating furnace of a bloom rolling rhythm automatic control method of the present invention.

[0049] Figure 4 It is a program segment diagram for controlling the discharging roller table of a bloom rolling rhythm automatic control method of the present invention.

[0050] Figure 5 It is a device control system diagram of a bloom rolling rhythm automatic control system of the present invention.

[0051] Figure 6 It is a layout diagram of the on-site control process of a bloom rolling rhythm automatic control system of the present invention.

[0052] Figure 7 This is the PDA actual monitoring diagram of an automatic control method and system for the billet rolling rhythm of the present invention. Specific embodiments

[0053] In order to make the above objects, features, and advantages of the present invention more obvious and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings of the specification.

[0054] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Those skilled in the art can make similar generalizations without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0055] Secondly, the so-called "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that can be included in at least one implementation manner of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that excludes other embodiments.

[0056] Furthermore, the present invention is described in detail with reference to the schematic diagrams. When describing the embodiments of the present invention in detail, for the convenience of explanation, the cross-sectional views showing the device structure will be enlarged locally out of the general scale, and the schematic diagrams are only examples and should not limit the scope of protection of the present invention herein. In addition, in actual production, three-dimensional spatial dimensions including length, width, and depth should be included.

[0057] Embodiment 1

[0058] Referring to Figures 1 to 6 , which is an embodiment of the present invention, an automatic control method for the billet rolling rhythm is provided, including:

[0059] As Figure 1 shown, the specific process of the present invention is as follows:

[0060] S1: Establish a control program, set a man-machine dialogue window on the main control screen, and set and read the interval time of rolling. It should be noted that:

[0061] Currently, it is used in both the high-speed wire and bar lines. The interval time can be stabilized above 2.5 seconds. By adjusting the acceleration and deceleration time of the furnace roller table drive and the signal of the No. 1 rolling mill with steel, the fluctuation range can be controlled within about 0.2 seconds. Each line can set the interval time according to the actual situation.

[0062] This program is designed to run two control methods simultaneously. One is the automatic steel feeding control for billets, which starts the program control according to the change of the signal of the No. 1 rolling mill with steel. The other is the automatic billet discharging control, which ensures that the steel discharging rhythm follows the steel demand signal of the automatic steel feeding.

[0063] S2: Control the billet transportation of the heating furnace through the steel demand signal sent by the hot metal detector. It should be noted that:

[0064] Upon receiving the steel demand command, the outgoing billet roller table and the furnace outlet roller table in the heating furnace are started, and the billet is transported from the heating furnace to the furnace outlet roller table.

[0065] When the tail of the billet passes through the hot metal detector HMD1, the outgoing billet roller table in the heating furnace stops.

[0066] Preferably, the process of the billet decelerating and stopping on the roller table is as follows:

[0067] The calculation formula for the linear velocity of the furnace outlet roller table is as follows:

[0068] V1 = π * D * n / 60i

[0069] = 3.14159 * 300mm * 678 rpm / (60s * 10.37)

[0070] = 1.03m / s

[0071] Wherein, D is the roller diameter of the roller table, n is the rated speed of the motor, and i is the reduction ratio of the reduction gearbox;

[0072] The calculation formula for the acceleration of the furnace outlet roller table is as follows:

[0073] a = ΔV / Δt = (V1 - V0) / (t1 - t0) = V1 / t1

[0074] Wherein, V1 is the linear velocity of the furnace outlet roller table, i.e., the normal operating speed of the roller table, t1 is the deceleration time (set to 1.5 seconds by the frequency converter), ΔV is the speed change, Δt is the time interval, assuming V1 = 1.03m / s, V0 = 0m / s, t1 = 1.5s, t0 = 0s, then a = 0.69m / s 2 。

[0075] S3: Control the start of the billet through the steel throwing signal sent by the No. 1 rolling mill, and judge whether to send a steel demand signal to the heating furnace by the hot metal detector according to whether continuous rolling is carried out. It should be noted that:

[0076] If the No. 1 rolling mill sends a steel throwing signal, the billet on the furnace outlet roller table will continue to move forward and bite into the No. 1 rolling mill;

[0077] If the No. 1 rolling mill sends a steel presence signal, the billet will automatically stop 1.5 meters in front of the No. 1 rolling mill and wait;

[0078] Specifically, the distance traveled by the head of the billet to reach HMD2 (the distance between the hot metal detector and the No. 1 rolling mill is 6 meters) after decelerating and stopping after a time delay is as follows:

[0079] S1 = V1t2 + 1 / 2at2 2 = 1.03 * 3.6 + (1 / 2) * 0.69 * (1.5^2) = 3.71m + 0.78m = 4.49m

[0080] Among them, t2 is the program - set delay time of 3.6s. According to S1 = 4.49m and the distance S2 between the hot - metal detector and the No.1 rolling mill is 6m, the billet stops at a place about x = 1.5m away from the No.1 rolling mill on the billet - discharging roller table.

[0081] If the No.1 rolling mill sends out a signal that the previous billet has been discharged, the billet waiting at 1.5m in front of the No.1 rolling mill will start again and move forward until it is bitten by the No.1 rolling mill;

[0082] The acceleration distance and time of the billet can be calculated as 0.78m and 1.5s respectively from the above calculations;

[0083] Calculation of the time for the billet to be bitten into the rolling mill at a constant speed:

[0084] t3=(S3) / V1=(x - 1 / 2at2 2 ) / V1 = 0.72m / 1.03m / s = 0.7s

[0085] According to the above formula, the total time t4 for the billet to start and run until it is bitten into the rolling mill is t4 = t1 + t3 = 1.5s + 0.7s = 2.2s. In actual applications, due to factors such as the response of the discharged - billet signal, program response, and drive response, the actual billet - biting interval time is 2.5 seconds.

[0086] If the billet is bitten into the No.1 rolling mill and when its tail passes the hot - metal detector HMD2 on the billet - discharging roller table, the delay time will send a steel - demand signal to the heating furnace;

[0087] Specifically, as Figure 2 shown, when the heating furnace receives the steel - demand signal, it starts to discharge steel. The heating furnace is set to discharge steel after the delay time when the tail (signal falling edge) of the previous billet passes the hot - metal detector HMD2. When the delay - time timing arrives, the heating furnace starts to discharge steel, specifically as follows:

[0088] As Figures 3 to 4 shown, the inter - lock conditions for the heating furnace to discharge steel are: the operating console is set to the automatic - steel - discharging selection position, the rolling line requires continuous steel - discharging, the pusher is in the retracted position, and the walking beam of the heating furnace has completed one - week operation. After meeting the conditions, a roller - table operation command is issued.

[0089] Interlock conditions for roller table operation during tapping: The operating console is set to the automatic tapping selection position, there is steel on the roller table, the walking beam of the heating furnace has descended to the in-place position, the discharging furnace door of the heating furnace has risen to the in-place position, etc. After the conditions are met, the roller table operates. When the tail of the billet being conveyed by the roller table passes through the hot metal detector HMD2, tapping occurs after a delay time, and then the next tapping cycle follows.

[0090] S4: Compare the rolling interval time between two billets and the set rolling interval time, and control the linear speed of the furnace roller table to keep the rolling rhythm stable at the set rolling interval time. It should be noted that:

[0091] Calculate the linear speed of the furnace roller table based on the set rolling interval time;

[0092] If the set rolling interval time < the rolling interval time between two billets, increase the linear speed of the furnace roller table;

[0093] If the set rolling interval time > the rolling interval time between two billets, decrease the linear speed of the furnace roller table.

[0094] As Figures 5 to 6 shown, this embodiment also provides a billet rolling rhythm automatic control system, including:

[0095] The PLC is the control center, and there is a setting and reading module, which is used to establish a control program, set a man-machine dialogue window, i.e., the human-machine interface HMI, on the main control screen, and set and read the rolling interval time;

[0096] The control module uses the first metal detector to control the conveying of billets in the heating furnace according to the steel demand signal sent by the second hot metal detector, controls the starting of the billets according to the steel throwing signal sent by the No. 1 rolling mill, and judges whether to use the second hot metal detector to send a steel demand signal to the heating furnace according to whether continuous rolling is carried out;

[0097] Among them, the drive controller controls the No. 1 rolling mill, i.e., the first rolling mill, through a DC motor and controls the conveying roller table through a frequency conversion motor.

[0098] The measurement module is used to compare the rolling interval time between two billets and the set rolling interval time, and control the linear speed of the furnace roller table to keep the rolling rhythm stable at the set rolling interval time.

[0099] This embodiment also provides a computing device, which is applicable to the case of the billet rolling rhythm automatic control method, including:

[0100] A memory and a processor; the memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions to implement the billet rolling rhythm automatic control method proposed in the above embodiment.

[0101] The computer device may be a terminal, which includes a processor, a memory, a communication interface, a display screen, and an input device connected via a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The communication interface of the computer device is used to communicate with external terminals in a wired or wireless manner, and the wireless manner can be achieved through WIFI, operator network, NFC (Near Field Communication) or other technologies. The display screen of the computer device can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer covered on the display screen, or buttons, trackballs or touchpads provided on the outer shell of the computer device, or an external keyboard, touchpad or mouse, etc.

[0102] This embodiment also provides a storage medium, on which a computer program is stored, and when the program is executed by a processor, it implements the method for automatically controlling the billet rolling rhythm proposed in the above embodiment.

[0103] The storage medium proposed in this embodiment and the data storage method proposed in the above embodiment belong to the same inventive concept. For technical details not described in detail in this embodiment, reference can be made to the above embodiment, and this embodiment has the same beneficial effects as the above embodiment.

[0104] Embodiment 2

[0105] This is another embodiment of the present invention. Different from the first embodiment, it provides a verification test for the method of automatically controlling the billet rolling rhythm to verify and explain the technical effects adopted in this method.

[0106] Taking Φ5.5 national standard steel as an example, compare the specific benefits such as the steel output before and after the transformation using the present invention, and the calculation results are as follows in the table:

[0107] Table 1: Calculation results of specific benefits before and after transformation

[0108]

[0109] As can be seen from the above table, the biting time interval of the No. 1 rolling mill after the transformation is reduced by 44% compared with that before the transformation, and the hourly output is increased by 5%. This result brings about a reduction in the power consumption per ton of steel and gas consumption. It can be seen that the present invention has achieved good results compared with the traditional method, as Figure 7 shown. According to the actual monitoring screen of the PDA, it can be seen that the present invention has been put into use and has brought good benefits.

[0110] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. An automatic control method for the rhythm of bloom rolling steel, characterized in that: including, establishing a control program, setting up a man-machine dialogue window on the main control screen, and setting and reading the interval time of steel rolling; using a first metal detector to control the feeding of billets into the heating furnace according to the steel demand signal sent by the second metal detector; controlling the start of the billet based on the steel throwing signal sent by the first rolling mill, and judging whether to use the second metal detector to send a steel demand signal to the heating furnace according to whether continuous steel rolling is performed. If the first rolling mill sends a steel throwing signal, the billet on the discharge roller table will continue to move forward and be bitten into the first rolling mill; if the first rolling mill sends a signal indicating the presence of steel, the billet will automatically stop in front of the first rolling mill and wait, including: the distance traveled by the billet head to reach the second metal detector and then decelerate and stop after a time delay is as follows: S1 = V1t2 + 1 / 2at2 2 wherein, V1 is the linear speed of the discharge roller table, i.e., the normal operating speed of the roller table, t2 is the time delay set by the program, a is the acceleration of the discharge roller table. According to the calculation result of S1 above and the distance S2 between the second metal detector and the first rolling mill, the billet stops on the discharge roller table at a distance x = S2 - S1 from the first rolling mill and waits; if the first rolling mill sends a steel throwing signal for the previous billet, the billet waiting in front of the first rolling mill will start again and move forward until it is bitten into the first rolling mill; comparing the rolling interval time of two billets and the set steel rolling interval time, and performing control on the linear speed of the furnace roller table to make the steel rolling rhythm stable at the set steel rolling interval time; performing control on the linear speed of the discharge roller table by comparing the rolling interval time of two billets and the set steel rolling interval time includes calculating the linear speed of the discharge roller table by setting the steel rolling interval time; if the set steel rolling interval time < the rolling interval time of two billets, then increase the linear speed of the discharge roller table; if the set steel rolling interval time > the rolling interval time of two billets, then decrease the linear speed of the discharge roller table.

2. The automatic control method for the billet rolling rhythm according to claim 1, wherein: using a first metal detector to control the feeding of billets into the heating furnace according to the steel demand signal sent by the second metal detector includes that when the heating furnace receives the steel demand command, the outgoing steel roller table and the discharge roller table in the heating furnace start, and the billet is transported from the heating furnace to the discharge roller table.

3. The automatic control method for the billet rolling rhythm according to claim 1, wherein: judging whether to use the second metal detector to send a steel demand signal to the heating furnace according to whether continuous steel rolling is performed includes that if the billet is bitten into the first rolling mill and when the tail passes through the second metal detector on the discharge roller table, then a steel demand signal is sent to the heating furnace after a time delay.

4. A billet rolling rhythm automatic control system, applied to the method described in any one of claims 1-3, characterized in that, including: a setting and reading module for establishing a control program, setting up a man-machine dialogue window on the main control screen, and setting and reading the interval time of steel rolling; a control module that uses a first metal detector to control the feeding of billets into the heating furnace according to the steel demand signal sent by the second metal detector, controls the start of the billet through the steel throwing signal sent by the first rolling mill, and judges whether to use the second metal detector to send a steel demand signal to the heating furnace according to whether continuous steel rolling is performed; a measurement module for comparing the rolling interval time of two billets and the set steel rolling interval time, and performing control on the linear speed of the furnace roller table to make the steel rolling rhythm stable at the set steel rolling interval time.

5. A computing device, including: a memory and a processor; The memory is used for storing computer-executable instructions, and the processor is used for executing the computer-executable instructions. When the computer-executable instructions are executed by the processor, the steps of the billet rolling rhythm automatic control method according to any one of claims 1 to 3 are implemented.

6. A computer-readable storage medium stores computer-executable instructions. When the computer-executable instructions are executed by a processor, the steps of the billet rolling rhythm automatic control method according to any one of claims 1 to 3 are implemented.

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