A control method for improving rolling rhythm of double-high-rod straight rolling process

Abstract

The present application relates to the field of steel metallurgy, and in particular to a control method for improving the rolling rhythm of double-high-rod straight rolling process, which sets multiple time thresholds as control parameters of the double-high-rod straight rolling process, provides a stable and continuous casting rhythm, dynamically adjusts the steel passing gap time of 6# flying shear and 10# flying shear in real time, and judges and handles abnormal conditions (sliding of billets, steel stacking, and steel drilling cage at the tail of the hub) in real time, so as to prevent accidents such as sliding of billets, steel stacking, and steel drilling cage at the tail of the hub, and help to stabilize and continuously the billet rolling production line, improve the rolling rhythm of the double-high-rod straight rolling process, improve the production efficiency and production quality, and improve the competitiveness of enterprises.

Description

Technical Field

[0001] This invention relates to the field of iron and steel metallurgy, and specifically to a method for controlling the rolling rhythm of a double-high bar straight rolling process. Background Technology

[0002] In modern steel industry, the double-high-strength bar hot-feed to rolling process (referred to as double-high-strength bar direct rolling process) refers to the process of directly conveying high-temperature steel billets from the continuous casting machine to the double-high-strength bar rolling mill for rolling. This process mainly includes the following steps: mill demand, continuous casting billet delivery, hot conveying via roller conveyor, and rolling on the mill. The double-high-strength bar operator first issues a demand signal based on the actual rolling status of the steel billet. After receiving the demand signal, the continuous casting machine produces the steel billet, which is then rapidly hot-fed via conveyor roller conveyor to the rolling mill for rolling.

[0003] The entire process of high-strength bar direct rolling is equipped with a heat detection device to monitor the billet temperature in real time, and the rolling rhythm is controlled by the real-time billet temperature. However, as the market demand for high-strength bars continues to grow and the target output of high-strength bars continues to increase, this control method has gradually exposed many problems:

[0004] ① The steel demand rhythm of the rolling mill is unstable and discontinuous: The billet rolling production line of the double high bar direct rolling process includes multiple complex links. Relying solely on the steel demand signals sent by the double high bar operators is not only unable to accurately arrange the rolling process according to the rolling mill status and the actual temperature of the billet, but also often delays the sending of steel demand signals due to the busyness of the double high bar operators or other unforeseen circumstances, resulting in an unstable and discontinuous steel demand rhythm of the rolling mill.

[0005] ② Excessive gap time between steel passing through the No. 6 and No. 10 shears: The No. 6 and No. 10 flying shears identify different steel billets by using the heat detection signal generated by the heat detection device. In order to avoid the No. 6 and No. 10 flying shears failing to identify the steel billets due to similar heat detection signals, which could lead to accidents such as steel piling and drilling cage at the tail of the rotating hub, the No. 6 and No. 10 flying shears are respectively set with fixed protection distances and large gap time between steel passing through, which reduces the rolling rhythm of the double high-strength bar direct rolling process;

[0006] ③ Lack of abnormal condition warning devices: The hot delivery and rolling process of double-high-strength steel bars typically involves multiple production lines, each encompassing multiple stages. When an abnormality occurs in a certain stage (such as steel slippage, steel piling, steel drilling at the tail of the drum, etc.), double-high-strength steel bar operators often cannot directly observe it. Only when the abnormality further expands and seriously affects the rolling process can the operators become aware of it and take remedial measures. This not only easily damages the rolling mill equipment but also increases production costs.

[0007] It is evident that the aforementioned problems not only lead to a slow rolling pace and low output in the double-high bar direct rolling process, making it unable to meet rapidly growing market demand, but may even result in serious production accidents.

[0008] How to maximize the rolling speed and increase the output of high-strength bars while ensuring production safety has always been a problem that technicians in this field urgently need to solve. Summary of the Invention

[0009] The purpose of this invention is to address the shortcomings of existing technologies by providing a control method for improving the rolling rhythm of the double high-strength bar direct rolling process. By setting multiple time thresholds as control parameters for the double high-strength bar direct rolling process, a stable and continuous steel feeding rhythm is provided. Furthermore, by dynamically adjusting the steel passage gap time of the No. 6 and No. 10 flying shears in real time, and by judging and handling abnormal conditions (slab slippage, steel accumulation, steel in the drill cage at the tail of the rotating drum) in real time, the rolling rhythm of the double high-strength bar direct rolling process is improved.

[0010] The objective of this invention is achieved through the following solution: a method for controlling the rolling rhythm of a double-high bar straight rolling process, comprising the following steps:

[0011] 1) Set the steel demand time threshold, steel bite time threshold, and target gap time threshold;

[0012] 2) Set several signal protection coefficients according to the target gap time threshold, and set the steel passage gap time threshold for each flying shear according to the signal protection coefficients;

[0013] 3) Use the multiple time thresholds set in steps 1) and 2) as control parameters to roll the steel billet in the double high bar direct rolling process.

[0014] Preferably, in step 2), the specific method for setting several signal protection coefficients based on the target gap time threshold and setting the steel-passing gap time threshold of each flying shear based on the signal protection coefficients includes:

[0015] 2-1) Set the signal protection coefficient K1 of the 6A flying shear, and use the following formula to set the steel passage gap time threshold T4 of the 6A flying shear:

[0016] K1 = (T3 - 0.5) * V1 / L1

[0017] T4 = K1 * L1 / V1

[0018] In the formula, K1 is the signal protection coefficient of 6A flying shear, T3 is the target gap time threshold, T4 is the steel passage gap time threshold of 6A flying shear, L1 is the distance from 3A pinch roll to 6A flying shear, and V1 is the real-time speed of 6A pinch roll.

[0019] 2-2) Set the signal protection coefficient K2 of the 6B flying shear, and adjust the steel passage gap time of the 6B flying shear using the following formula:

[0020] K2=(T3-0.5)*V2 / L2

[0021] T5 = K2 * L2 / V2

[0022] In the formula, K2 is the signal protection coefficient of 6B flying shear, T3 is the target gap time threshold, T5 is the steel passage gap time threshold of 6B flying shear, L2 is the distance from 3B pinch roll to 6B flying shear, and V2 is the real-time speed of 6B pinch roll.

[0023] 2-3) Set the signal protection coefficient K3 for the 10A flying shear, and adjust the steel passage gap time of the 10A flying shear using the following formula:

[0024] K3 = (T3 - 0.5) * V3 / L3

[0025] T6 = K3 * L3 / V3

[0026] In the formula, K3 is the signal protection coefficient of the 10A flying shear, T3 is the target gap time threshold, T6 is the steel passage gap time threshold of the 10A flying shear, L3 is the distance from the finishing mill 2A to the 10A flying shear, and V3 is the real-time speed of the 10A pinch roll.

[0027] 2-4) Set the signal protection coefficient K4 for the 10B flying shear, and calculate the steel clearance time of the 10B flying shear using the following formula:

[0028] K4 = (T3 - 0.5) * V4 / L4

[0029] T7 = K4 * L4 / V4

[0030] In the formula, K4 is the signal protection coefficient of the 10B flying shear, T3 is the target gap time threshold, T7 is the steel passage gap time threshold of the 10B flying shear, L4 is the distance from the finishing mill 2B to the 10B flying shear, and V4 is the real-time speed of the 10B pinch roll.

[0031] Preferably, in step 3), the multiple time thresholds set in steps 1) and 2) are used as control parameters. The specific method for rolling the steel billet in the double-high-strength bar direct rolling process includes:

[0032] 3-1) Control the steel issuance rhythm using the steel demand time threshold;

[0033] 3-2) Use the steel biting time threshold to determine whether the billet is slipping;

[0034] 3-3) Use the target gap time threshold to determine if there is a risk of the steel passage gap time being too short;

[0035] 3-4) Dynamically adjust the protection distance of each flying shear using several steel-passing gap time thresholds, and determine whether the steel-passing gap time of each flying shear is too short.

[0036] Preferably, in step 3-1), the specific method of controlling the steel delivery rhythm using the steel demand time threshold includes:

[0037] 3-1-1) The continuous casting machine receives the steel demand signal from the rolling mill, performs steelmaking, and sends a steel delivery signal to the hot-delivery straight rolling mill after steelmaking is completed.

[0038] 3-1-2) The hot-feeding straight rolling mill receives the steel delivery signal, sends a prohibition signal to the rolling mill, and transports the steel billet from the continuous casting machine to the rolling mill within the steel delivery time threshold.

[0039] 3-1-3) When the tail of the billet leaves the hot-stripping straightening roll before hot inspection, the hot-stripping straightening roll table sends a signal to the rolling mill to release the prohibition on steel demand.

[0040] 3-1-4) The rolling mill receives the signal to release the prohibition of steel demand and waits. When the waiting time is equal to the steel demand time threshold, it sends out a steel demand signal.

[0041] Preferably, in step 3-2), the specific method for determining whether the billet is slipping using the steel biting time threshold includes:

[0042] 3-2-1) Calculate the time it takes for the billet head to be identified at the entrance of frame #1 but not yet bitten;

[0043] 3-2-2) Compare the time calculated in step 3-2-1) with the steel biting time threshold to determine whether the billet is slipping;

[0044] ①If the time for identifying the billet head but not biting the billet is less than or equal to the biting time threshold, then the billet did not slip at the entrance of stand #1;

[0045] ② If the time for identifying the billet head but not biting the steel exceeds the biting time threshold, the steel will slip at the entrance of stand #1, triggering an alarm signal. The hot-feeding straight rolling mill will send a prohibition signal to the mill, stopping the discharge of steel from rollers #1 and #2. Roller #3 will reverse to back up and remove the slipping steel.

[0046] Preferably, in step 3-3), the specific method for determining whether there is a risk of the steel-passing gap time being too short using the target gap time threshold includes:

[0047] 3-3-1) Calculate the actual steel billet passing through stand #1 and stand #6 respectively;

[0048] 3-3-2) Compare the actual steel billet passage time through stand #1 with the target passage time threshold to determine whether the steel billet passage time through stand #1 is too short:

[0049] ①If the actual steel passage gap time of frame #1 is less than the target gap time threshold - 0.5, then there may be a risk that the steel billet passage gap time is too short, and an alarm signal will be issued;

[0050] ②If the actual steel passage gap time of frame #1 is greater than or equal to the target gap time threshold - 0.5, then there is no risk of the steel billet having too short a steel passage gap time;

[0051] 3-3-3) Compare the actual steel billet passage time through stand #6 with the target passage time threshold to determine whether the steel billet needs to be broken up:

[0052] ①If the actual steel passage time of frame #6 is less than the target gap time threshold, then control the #1 flying shear to start automatic breaking.

[0053] ②If the actual steel gap time of frame #6 is greater than or equal to the target gap time threshold, the steel billet will not be automatically crushed.

[0054] Preferably, in steps 3-4), the specific method for dynamically adjusting the protection distance of each flying shear using several steel-passing gap time thresholds and determining whether the steel-passing gap time of each flying shear is too short includes:

[0055] 3-4-1) The protection distance of each flying shear is dynamically adjusted using several steel-passing gap time thresholds;

[0056] 3-4-2) Calculate the actual steel passing gap time of the billet through the 6A flying shear, 6B flying shear, 10A flying shear, and 10B flying shear respectively;

[0057] 3-4-3) Compare the actual steel-passing gap time of the billet through the 6A flying shear with the steel-passing gap time threshold of the 6A flying shear to determine whether the steel-passing gap time of the 6A flying shear is too short:

[0058] ①If the actual steel-passing gap time of the 6A flying shear is less than the steel-passing gap time threshold of the 6A flying shear, then the steel-passing gap time of the 6A flying shear is too short, and the 6A flying shear will be controlled to start automatic breaking.

[0059] ②If the actual steel-passing gap time of the 6A flying shear is greater than or equal to the steel-passing gap time threshold of the 6A flying shear, then the steel-passing gap time of the 6A flying shear is not too short;

[0060] 3-4-4) Compare the actual steel-passing gap time of the billet through the 6B flying shear with the 6B flying shear steel-passing gap time threshold to determine whether the 6B flying shear steel-passing gap time is too short:

[0061] ①If the actual steel-passing gap time of the 6B flying shear is less than the steel-passing gap time threshold of the 6B flying shear, then the steel-passing gap time of the 6B flying shear is too short, and the 6B flying shear is controlled to start automatic breaking.

[0062] ②If the actual steel-passing gap time of the 6B flying shear is greater than or equal to the steel-passing gap time threshold of the 6B flying shear, then the steel-passing gap time of the 6B flying shear is not too short;

[0063] 3-4-5) Compare the actual steel-passing gap time of the billet through the 10A flying shear with the steel-passing gap time threshold of the 10A flying shear to determine whether the steel-passing gap time of the 10A flying shear is too short:

[0064] ①If the actual steel-passing gap time of the 10A flying shear is less than the steel-passing gap time threshold of the 10A flying shear, then the steel-passing gap time of the 10A flying shear is too short, and the 10A flying shear is controlled to start automatic breaking.

[0065] ②If the actual steel-passing gap time of the 10A flying shear is ≥ the steel-passing gap time threshold of the 10A flying shear, then the steel-passing gap time of the 10A flying shear is not too short;

[0066] 3-4-6) Compare the actual steel-passing gap time of the billet through the 10B flying shear with the 10B flying shear steel-passing gap time threshold to determine whether the 10B flying shear steel-passing gap time is too short:

[0067] ①If the actual steel-passing gap time of the 10B flying shear is less than the steel-passing gap time threshold of the 10B flying shear, then the steel-passing gap time of the 10B flying shear is too short, and the 10B flying shear is controlled to start automatic breaking.

[0068] ②If the actual steel-passing gap time of the 10B flying shear is greater than or equal to the steel-passing gap time threshold of the 10B flying shear, then the steel-passing gap time of the 10B flying shear is not too short.

[0069] Preferably, in step 3-4-1), the specific method for dynamically adjusting the protection distance of each flying shear using several steel-passing gap time thresholds includes:

[0070] ① Set the protection distance of the 6A flying shear to: K1*L1;

[0071] In the formula, K1 is the signal protection coefficient of the 6A flying shear, and L1 is the distance from the 3A pinch roller to the 6A flying shear;

[0072] ② Set the protection distance of the 6B flying shear to: K2*L2;

[0073] In the formula, K2 is the signal protection coefficient of the 6B flying shear, and L2 is the distance from the 3B pinch roller to the 6B flying shear;

[0074] ③ Set the protection distance of the 10A flying shear to: K3*L3;

[0075] In the formula, K3 is the signal protection coefficient of the 10A flying shear, and L3 is the distance from the 2A finishing mill to the 10A flying shear;

[0076] ④ Set the protection distance of the 10B flying shear to: K4*L4;

[0077] In the formula, K4 is the signal protection coefficient of the 10B flying shear, and L4 is the distance from the finishing mill 2B to the 10B flying shear.

[0078] Preferably, the target gap time threshold ranges from 3 to 4 seconds.

[0079] Preferably, the steel biting time threshold ranges from 5 to 6 seconds.

[0080] The beneficial effects of this invention are as follows:

[0081] ① By setting a steel demand time threshold, this invention can provide a continuous and stable steel delivery rhythm, reducing the slow steel delivery rhythm caused by manual steel demand signals and the idling time of the rolling mill waiting for steel billet supply, so that the rolling mill can maintain a high rolling speed and working efficiency, thereby improving production efficiency;

[0082] ② By setting a steel biting time threshold, this invention can monitor the state of the steel billet at the entrance of the No. 1 stand, avoiding the steel billet from staying at the entrance of the No. 1 stand for a long time due to abnormal conditions such as steel billet slippage, and preventing further impact of abnormal conditions.

[0083] While existing technology allows for improved efficiency by reducing the steel-passing gap time of the #6 and #10 shears—essentially accelerating the rolling pace by shortening the actual steel-passing gap time—sufficiently reducing this gap time can lead to various problems, such as:

[0084] ① The 6A flying shear's pre-heat inspection signal is protected by the 3A# pinch roll's pre-heat inspection signal. Within T4 seconds before the tail of the steel leaves the 3A pinch roll (T4 = 0.8 * L1 / V1, where V1 is the 6A pinch roll speed), the 6A flying shear's pre-heat inspection signal will not be lost. Increasing the rolling pace to a certain extent will cause the tail of the previous steel to leave the 3A pinch roll before the pre-heat inspection time to less than T4 seconds, while the next steel arrives at the 3A pinch roll for pre-heat inspection. In this case, the 6A flying shear will be unable to distinguish between the two steels and will not (cannot) execute the cutting command for the next steel, leading to a steel pile-up accident.

[0085] ② The 6B flying shear's pre-heat inspection signal is protected by the 3B pinch roll's pre-heat inspection signal. Within T5 seconds before the tail of the steel leaves the 3B pinch roll (T5 = 0.8 * L2 / V2, where V2 is the 6B pinch roll speed), the 6B flying shear's pre-heat inspection signal will not be lost. Increasing the rolling pace to a certain extent can cause the tail of the previous steel to leave the 3B pinch roll before the pre-heat inspection time to less than T5 seconds, while the next steel arrives at the 3B pinch roll for pre-heat inspection. In this case, the 6A# flying shear cannot distinguish between the two steels and therefore cannot execute the cutting command for the next steel, leading to a steel pile-up accident.

[0086] ③ The 10A flying shear's pre-heat inspection signal is protected by the finishing mill 2A pre-heat inspection signal. Within T6 seconds (T6 = 0.8 * L3 / V3, where V3 is the speed of the 10A pinch rolls) after the tail of the steel has left the finishing mill 2A pre-heat inspection signal, the 10A flying shear's pre-heat inspection signal will not be lost. Increasing the rolling rhythm to a certain extent will cause the tail of the previous steel to leave the finishing mill 2A pre-heat inspection signal in less than T6 seconds, while the next steel arrives at the finishing mill 2A pre-heat inspection signal. In this case, the 10A flying shear cannot distinguish between the two steel sections, causing BBD1A and BBD2A to fail to execute the tail braking command, resulting in a steel drilling accident at the tail of the rotating drum.

[0087] ④ The 10B flying shear's pre-heat inspection signal is protected by the finishing mill 2B pre-heat inspection signal. Within T7 seconds (T7 = 0.8 * L4 / V4, where V4 is the 10B pinch roll speed) after the tail of the steel has left the finishing mill 2B pre-heat inspection signal, the 10B flying shear's pre-heat inspection signal will not be lost. Increasing the rolling rhythm to a certain extent will cause the tail of the previous steel to leave the finishing mill 2B pre-heat inspection signal in less than T7 seconds, while the next steel arrives at the finishing mill 2B pre-heat inspection signal. In this case, the 10B flying shear cannot distinguish between the two steel sections, causing BBD1B and BBD2B to fail to execute the tail braking command, resulting in a steel drilling accident at the tail of the rotating drum.

[0088] The present invention solves the above problems by employing the following methods:

[0089] ①2-1) Set the signal protection coefficient K1 of the 6A flying shear, and use the following formula to set the steel passage gap time threshold T4 of the 6A flying shear:

[0090] K1 = (T3 - 0.5) * V1 / L1

[0091] T4 = K1 * L1 / V1

[0092] In the formula, K1 is the signal protection coefficient of 6A flying shear, T3 is the target gap time threshold, T4 is the steel passage gap time threshold of 6A flying shear, L1 is the distance from 3A pinch roll to 6A flying shear, and V1 is the real-time speed of 6A pinch roll.

[0093] This step essentially involves changing the fixed value of 0.8 in the 6A flying shear's steel gap time T4 = 0.8 * L1 / V1 to the variable K1. The variable K1 = (T3 - 0.5) * V1 / L1 dynamically adjusts the protection distance of the hot inspection before the 6A flying shear according to different rolling rhythms (originally 0.8 * L1, changed to K1 * L1), ensuring that when the rolling rhythm is increased, steel piling will no longer occur because the 6A flying shear cannot identify the two steel bars in front and behind.

[0094] ②2-2) Set the signal protection coefficient K2 of the 6B flying shear, and adjust the steel passage gap time of the 6B flying shear using the following formula:

[0095] K2=(T3-0.5)*V2 / L2

[0096] T5 = K2 * L2 / V2

[0097] In the formula, K2 is the signal protection coefficient of 6B flying shear, T3 is the target gap time threshold, T5 is the steel passage gap time threshold of 6B flying shear, L2 is the distance from 3B pinch roll to 6B flying shear, and V2 is the real-time speed of 6B pinch roll.

[0098] This step essentially involves changing the fixed value of 0.8 in the 6B flying shear's steel gap time T5 = 0.8 * L2 / V2 to the variable K2. The variable K2 = (T3 - 0.5) * V2 / L2. Based on different rolling rhythms, the protection distance of the hot inspection before the 6B flying shear is dynamically adjusted (originally 0.8 * L2, changed to K2 * L2). This ensures that when the rolling rhythm is increased, steel piling will no longer occur because the 6B flying shear cannot identify the two steel bars in front and behind.

[0099] ③2-3) Set the signal protection coefficient K3 for the 10A flying shear, and adjust the steel passage gap time of the 10A flying shear using the following formula:

[0100] K3 = (T3 - 0.5) * V3 / L3

[0101] T6 = K3 * L3 / V3

[0102] In the formula, K3 is the signal protection coefficient of the 10A flying shear, T3 is the target gap time threshold, T6 is the steel passage gap time threshold of the 10A flying shear, L3 is the distance from the finishing mill 2A to the 10A flying shear, and V3 is the real-time speed of the 10A pinch roll.

[0103] This step essentially changes the fixed value of 0.8 in the 10A flying shear's steel gap time T6 = 0.8 * L3 / V3 to the variable K3. The variable K3 = (T3 - 0.5) * V3 / L3. Based on different rolling rhythms, the protection distance of the 10A flying shear's preheating inspection is dynamically adjusted (originally 0.8 * L3, changed to K3 * L3). This ensures that when the rolling rhythm is increased, the 10A flying shear will no longer fail to identify the two steel bars in front and behind, causing BBD1A and BBD2A to fail to execute the tail braking command, resulting in a steel drilling cage accident at the tail of the rotating drum.

[0104] ④2-4) Set the signal protection coefficient K4 for the 10B flying shear, and calculate the steel clearance time of the 10B flying shear using the following formula:

[0105] K4 = (T3 - 0.5) * V4 / L4

[0106] T7 = K4 * L4 / V4

[0107] In the formula, K4 is the signal protection coefficient of 10B flying shear, T3 is the target gap time threshold, T7 is the steel passage gap time threshold of 10B flying shear, L4 is the distance from the finishing mill 2B to the 10B flying shear, and V4 is the real-time speed of the 10B pinch roll.

[0108] This step essentially changes the fixed value of 0.8 in the 10B flying shear's steel-passing gap time T7 = 0.8 * L4 / V4 to the variable K4. The variable K4 = (T3 - 0.5) * V4 / L4. Based on different rolling rhythms, the protection distance of the 10B flying shear's pre-heat inspection is dynamically adjusted (originally 0.8 * L4, changed to K4 * L4). This ensures that when the rolling rhythm is increased, the 10B flying shear will no longer fail to identify the two steel bars in front and behind, preventing BBD1B and BBD2B from failing to execute the tail braking command and causing the steel to drill through the cage at the tail of the rotating drum.

[0109] The advantages of this invention are as follows:

[0110] ① By setting multiple time thresholds and comparing them with the real-time steel passing gap time of the corresponding frame, the present invention can break the steel billet when the steel passing gap time is too short, preventing accidents such as steel slippage, steel piling, and drilling cage at the tail of the rotating hub. This helps to stabilize and maintain the continuity of the steel billet rolling production line, improves the yield of steel billets, and extends the service life of the equipment.

[0111] ② This invention establishes a complete set of control logic, which ensures that all links in the billet rolling production line are closely connected. While ensuring production safety, it accelerates the rolling rhythm of the hot-rolled double-high bar process as much as possible, thereby increasing the output of double-high bar. This helps to improve the production efficiency and quality of the hot-rolled double-high bar process and enhance the competitiveness of enterprises.

[0112] Glossary

[0113] High-yield and high-quality bar production lines typically refer to bar production lines characterized by both high output and high quality.

[0114] Hot delivery: refers to sending freshly produced steel billets, which are still at a high temperature, directly to the rolling mill, rather than cooling them first and then heating them.

[0115] Steel passing interval time: refers to the time interval between two adjacent steel billets (or rolled pieces) passing through the rolling mill during the hot-feeding direct rolling process of double-high-strength bars. It reflects the rhythm and continuity of the rolling process and is one of the important indicators for measuring the efficiency and stability of the production line.

[0116] Continuous casting: also known as continuous casting of steel, is a steel production process in which molten steel is continuously cast into billets of a certain shape and specifications using specific equipment and processes.

[0117] Line HMI: A human-machine interface system specifically designed for monitoring and controlling the rolling production process in a rolling line (rolling production line) environment. It connects to various equipment in the rolling line, such as rolling mills, conveyor systems, and heating furnaces.

[0118] Hot-feed direct rolling mill: This is a device used in steel production to transport continuously cast billets. It consists of a series of rollers, usually driven by a motor, which enables the forward transport of the billets. When the billets exit the continuous casting machine, they are still very hot. The hot-feed direct rolling mill can directly transport the hot billets to the rolling mill for rolling, eliminating the need for the cooling and reheating processes found in traditional processes.

[0119] Flying shear: A device used to shear moving rolled materials. In a rolling production line, it can quickly and accurately shear continuously moving metal materials (rolled materials) such as steel billets and aluminum according to a pre-set length.

[0120] Slippery steel: refers to steel billets that do not pass through the rolls according to the normal rolling path and speed during the rolling process, but instead slide on the surface of the rolls and cannot be properly bitten and rolled.

[0121] Steel piling: refers to the phenomenon of steel billets or steel products accumulating between or inside rolling mills during the rolling process. For example, in the continuous rolling process of double high-strength bar direct rolling, steel billets fail to pass through the rolling mill at the normal rolling speed and rhythm and accumulate in front of or between a certain rolling mill, forming a disordered accumulation state of steel billets.

[0122] A cage accident at the tail of the rotating hub refers to an abnormal situation where the BBD (tail brake, which is responsible for slowing down high-speed steel, including BBD1A, BBD2A, BBD1B, and BBD2B; BBD1A and BBD2A are the #1 and #2 tail brakes of line A, and BBD1B and BBD2B are the #1 and #2 tail brakes of line B) fails to issue a command to hold the high-speed steel and reduce its speed. As a result, when the steel enters the rotating hub and rotates, it flies directly into the cage at the tail of the hub, causing the hub to malfunction. Furthermore, the detection signal at the tail of the hub will trigger a breakage command for the entire line.

[0123] Steel demand time: This refers to the countdown time for steel demand, specifically the interval between the rolling mill sending a steel demand signal to the continuous casting machine.

[0124] Biting time: refers to the interval between when the No. 1 stand identifies the billet through the heat detection device and when the billet is bitten.

[0125] Target gap time: refers to the instantaneous interval (Beijing time, accurate to milliseconds) between when the first billet is identified and when the second billet is identified on stand #6. It can be adjusted in real time according to production process requirements.

[0126] Signal protection factor: An intermediate parameter used to adjust the minimum allowable gap time between steel sections of the flying shear.

[0127] Steel passing gap time: The instantaneous interval between when the flying shear identifies the first steel billet and when it identifies the second steel billet (Beijing time, accurate to milliseconds). Attached Figure Description

[0128] Figure 1 This is a flowchart of the method of the present invention;

[0129] Figure 2 This is a schematic diagram of the hardware structure in this embodiment;

[0130] Figure 3 This is the control flowchart for the steel structure in this embodiment;

[0131] Figure 4 This is a schematic diagram of the dynamic adjustment logic control of the front hot shear protection distance for flying shears #6 and #10 in this embodiment;

[0132] Figure 5 This is a layout diagram of the double high-strength bar equipment in this embodiment. Detailed Implementation

[0133] like Figures 1 to 5 As shown, a method for controlling the rolling rhythm of a double-high bar straight rolling process includes the following steps:

[0134] 1) Set the steel demand time threshold, steel bite time threshold, and target gap time threshold;

[0135] 2) Set several signal protection coefficients according to the target gap time threshold, and set the steel passage gap time threshold for each flying shear according to the signal protection coefficients;

[0136] 3) Use the time thresholds set in steps 1) and 2) as control parameters to roll the steel billet in the double high bar direct rolling process.

[0137] The rolling rhythm of the double-high bar direct rolling process is controlled by the above steps, and an example is shown below:

[0138] 1) Set the steel demand time threshold T1 (steel demand countdown time), steel bite time threshold, and target gap time threshold T3 (steel passage gap time of No. 6 stand) on the rolling line HMI screen;

[0139] In this embodiment, the target gap time threshold T3 ranges from 3 to 4 seconds, and the steel biting time threshold ranges from 5 to 6 seconds.

[0140] The steel demand time threshold T1, steel bite time threshold, and target gap time threshold T3 can all be flexibly set by the double-high bar mill operator in the open parameter setting window of the HMI operation interface. The specific value range is adjusted flexibly by the double-high bar mill operator according to different rolling specifications. Specifically, the target gap time threshold T3 is controlled within a range close to 3 seconds but not less than 3 seconds. The steel demand time threshold is set 30 ± 1 seconds more than the target gap time threshold T3, and then adjusted according to the actual rolling situation of multiple steel billets (generally 2-3 billets) until the actual steel passage interval time of stand #6 is as close to T3 as possible but not lower than T3. In other words, the steel demand time threshold is an empirical value determined through multiple calibration experiments, with a value range of 3-4 seconds (and making the values ​​of time T1 and time T3 as close as possible). Similarly, the steel bite time threshold is also an empirical value determined through multiple calibration experiments after setting the target gap time threshold.

[0141] This embodiment achieves stable control of the continuous casting feeding rhythm by adjusting the target gap time threshold T3 and the steel demand time threshold T1. Furthermore, measures such as alarm on stand #1, blocking of steel demand, and automatic shearing on fly #1 are implemented to ensure that the rolling line can continue rolling normally even when the steel demand gap is too short. These measures balance the steel demand and continuous casting feeding rhythms of the double-high-strength bar mill, ensuring a stable and continuous continuous casting feeding rhythm and preventing problems such as steel jamming or slow feeding rhythm due to coordination issues between steel demand and feeding. This ultimately improves the rolling rhythm, reduces the incidence of production accidents, increases the yield, and extends the service life of the equipment.

[0142] 2) The specific methods for setting several signal protection coefficients (protection signal coefficients) based on the target gap time threshold T3, and setting the steel passage gap time threshold for each flying shear based on the signal protection coefficients, include:

[0143] 2-1) Set the signal protection coefficient K1 of the 6A flying shear, and use the following formula to set the steel passage gap time threshold T4 of the 6A flying shear:

[0144] K1 = (T3 - 0.5) * V1 / L1

[0145] T4 = K1 * L1 / V1

[0146] In the formula, K1 is the signal protection coefficient of 6A flying shear, T3 is the target gap time threshold, T4 is the steel passage gap time threshold of 6A flying shear, L1 is the distance from 3A pinch roll to 6A flying shear, and V1 is the real-time speed of 6A pinch roll.

[0147] 2-2) Set the signal protection coefficient K2 of the 6B flying shear, and adjust the steel passage gap time of the 6B flying shear using the following formula:

[0148] K2=(T3-0.5)*V2 / L2

[0149] T5 = K2 * L2 / V2

[0150] In the formula, K2 is the signal protection coefficient of 6B flying shear, T3 is the target gap time threshold, T5 is the steel passage gap time threshold of 6B flying shear, L2 is the distance from 3B pinch roll to 6B flying shear, and V2 is the real-time speed of 6B pinch roll.

[0151] 2-3) Set the signal protection coefficient K3 for the 10A flying shear, and adjust the steel passage gap time of the 10A flying shear using the following formula:

[0152] K3 = (T3 - 0.5) * V3 / L3

[0153] T6 = K3 * L3 / V3

[0154] In the formula, K3 is the signal protection coefficient of the 10A flying shear, T3 is the target gap time threshold, T6 is the steel passage gap time threshold of the 10A flying shear, L3 is the distance from the finishing mill 2A to the 10A flying shear, and V3 is the real-time speed of the 10A pinch roll.

[0155] 2-4) Set the signal protection coefficient K4 for the 10B flying shear, and calculate the steel clearance time of the 10B flying shear using the following formula:

[0156] K4 = (T3 - 0.5) * V4 / L4

[0157] T7 = K4 * L4 / V4

[0158] In the formula, K4 is the signal protection coefficient of the 10B flying shear, T3 is the target gap time threshold, T7 is the steel passage gap time threshold of the 10B flying shear, L4 is the distance from the finishing mill 2B to the 10B flying shear, and V4 is the real-time speed of the 10B pinch roll.

[0159] 3) The time thresholds set in steps 1) and 2) are used as additional control parameters (i.e., excluding the conventional parameters of the double-high-strength bar direct rolling process). The specific methods for rolling steel billets in the double-high-strength bar direct rolling process include:

[0160] 3-1) The timing of steel issuance is controlled using the steel demand time threshold T1. Specific methods include:

[0161] 3-1-1) The continuous casting machine receives the steel demand signal from the rolling mill, performs steelmaking, and sends a steel delivery signal to the hot-delivery straight rolling mill after steelmaking is completed.

[0162] 3-1-2) The hot-feeding straight rolling mill receives the steel delivery signal, sends a steel demand prohibition signal to the rolling mill, and transports the steel billet from the continuous casting machine to the rolling mill within the steel demand time threshold T1;

[0163] 3-1-3) When the tail of the billet leaves the hot-stripping straightening roll before hot inspection, the hot-stripping straightening roll table sends a signal to the rolling mill to release the prohibition on steel demand.

[0164] 3-1-4) The rolling mill receives the signal to release the prohibition of steel demand and waits. When the waiting time is equal to the steel demand time threshold T1, it sends out the steel demand signal.

[0165] In this embodiment, the steel demand time threshold T1 is used in the form of a countdown. That is, after the hot-feeding straight rolling mill receives the steel delivery signal from the continuous casting, it triggers T1 to start the countdown and sends a steel demand prohibition signal to the continuous casting. When the tail of the steel bar leaves the hot-feeding straight rolling mill before the hot inspection, the steel demand prohibition signal is released and the mill steel demand countdown T1 is triggered. When the preset countdown time T1 is reached, the continuous casting is allowed to continue feeding steel to the double high-strength bar.

[0166] 3-2) Determining whether the billet is slipping using the steel biting time threshold includes the following methods:

[0167] 3-2-1) Calculate the time it takes for the billet head to be identified at the entrance of frame #1 but not yet bitten;

[0168] 3-2-2) Compare the time calculated in step 3-2-1) with the steel biting time threshold to determine whether the billet is slipping;

[0169] ①If the time for identifying the billet head but not biting the billet is less than or equal to the biting time threshold, then the billet did not slip at the entrance of stand #1;

[0170] ② If the time for identifying the billet head but not biting the steel exceeds the biting time threshold, the steel will slip at the entrance of stand #1, triggering the HMI and buzzer to issue an alarm signal, indicating that the steel is slipping at the entrance of stand #1. The hot-feeding straight rolling mill sends a prohibition signal to the mill, and the #1 and #2 rollers stop exiting the furnace. The #3 roller reverses to back up and remove the slipping steel.

[0171] 3-3) Use the target gap time threshold T3 to determine if there is a risk of the steel passage gap time being too short. Specific methods include:

[0172] 3-3-1) Calculate the actual steel billet passing through stand #1 and stand #6 respectively;

[0173] 3-3-2) Compare the actual steel billet passage time through stand #1 with the target passage time threshold T3 to determine whether the steel billet passage time through stand #1 is too short:

[0174] ① If the actual steel passage gap time of frame #1 is less than the target gap time threshold T3-0.5, then there may be a risk that the steel billet passage gap time is too short, and the buzzer will sound an alarm signal.

[0175] ②If the actual steel passage gap time of frame #1 is greater than or equal to the target gap time threshold T3-0.5, then there is no risk that the steel billet passage gap time is too short;

[0176] 3-3-3) Compare the actual steel billet passage time through stand #6 with the target passage time threshold T3 to determine whether the steel billet needs to be broken up:

[0177] ①If the actual steel passage gap time of frame #6 is less than the target gap time threshold T3, then control the #1 flying shear to start automatic breaking.

[0178] ②If the actual steel gap time of frame #6 is greater than or equal to the target gap time threshold T3, then the steel billet will not be automatically crushed.

[0179] 3-4) The specific methods for dynamically adjusting the protection distance of each flying shear using several steel-passing gap time thresholds and determining whether the steel-passing gap time of each flying shear is too short include:

[0180] 3-4-1) The protection distance of each flying shear is dynamically adjusted using several steel-passing gap time thresholds. Specific methods include:

[0181] ① Set the protection distance of the 6A flying shear to: K1*L1;

[0182] In the formula, K1 is the signal protection coefficient of the 6A flying shear, and L1 is the distance from the 3A pinch roller to the 6A flying shear;

[0183] ② Set the protection distance of the 6B flying shear to: K2*L2;

[0184] In the formula, K2 is the signal protection coefficient of the 6B flying shear, and L2 is the distance from the 3B pinch roller to the 6B flying shear;

[0185] ③ Set the protection distance of the 10A flying shear to: K3*L3;

[0186] In the formula, K3 is the signal protection coefficient of the 10A flying shear, and L3 is the distance from the 2A finishing mill to the 10A flying shear;

[0187] ④ Set the protection distance of the 10B flying shear to: K4*L4;

[0188] In the formula, K4 is the signal protection coefficient of the 10B flying shear, and L4 is the distance from the finishing mill 2B to the 10B flying shear.

[0189] In this embodiment, the protection distance of the preheating inspection of the No. 6 and No. 10 flying shears was dynamically adjusted (originally 0.8*L, changed to K*L). This ensures that when the rolling rhythm is increased, accidents such as steel piling and cage drilling will no longer occur because the No. 6 and No. 10 flying shears cannot identify the two steel bars in front and behind. This achieves the purpose of improving the rolling rhythm, reducing the incidence of production accidents, and increasing the yield.

[0190] 3-4-2) Calculate the actual steel passing gap time of the billet through the 6A flying shear, 6B flying shear, 10A flying shear, and 10B flying shear respectively;

[0191] 3-4-3) Compare the actual steel-passing gap time of the billet through the 6A flying shear with the steel-passing gap time threshold of the 6A flying shear to determine whether the steel-passing gap time of the 6A flying shear is too short:

[0192] ①If the actual steel-passing gap time of the 6A flying shear is less than the steel-passing gap time threshold of the 6A flying shear, then the steel-passing gap time of the 6A flying shear is too short, and the 6A flying shear will be controlled to start automatic breaking.

[0193] ②If the actual steel-passing gap time of the 6A flying shear is greater than or equal to the steel-passing gap time threshold of the 6A flying shear, then the steel-passing gap time of the 6A flying shear is not too short;

[0194] 3-4-4) Compare the actual steel-passing gap time of the billet through the 6B flying shear with the 6B flying shear steel-passing gap time threshold to determine whether the 6B flying shear steel-passing gap time is too short:

[0195] ①If the actual steel-passing gap time of the 6B flying shear is less than the steel-passing gap time threshold of the 6B flying shear, then the steel-passing gap time of the 6B flying shear is too short, and the 6B flying shear is controlled to start automatic breaking.

[0196] ②If the actual steel-passing gap time of the 6B flying shear is greater than or equal to the steel-passing gap time threshold of the 6B flying shear, then the steel-passing gap time of the 6B flying shear is not too short;

[0197] 3-4-5) Compare the actual steel-passing gap time of the billet through the 10A flying shear with the steel-passing gap time threshold of the 10A flying shear to determine whether the steel-passing gap time of the 10A flying shear is too short:

[0198] ①If the actual steel-passing gap time of the 10A flying shear is less than the steel-passing gap time threshold of the 10A flying shear, then the steel-passing gap time of the 10A flying shear is too short, and the 10A flying shear is controlled to start automatic breaking.

[0199] ②If the actual steel-passing gap time of the 10A flying shear is ≥ the steel-passing gap time threshold of the 10A flying shear, then the steel-passing gap time of the 10A flying shear is not too short;

[0200] 3-4-6) Compare the actual steel-passing gap time of the billet through the 10B flying shear with the 10B flying shear steel-passing gap time threshold to determine whether the 10B flying shear steel-passing gap time is too short:

[0201] ①If the actual steel-passing gap time of the 10B flying shear is less than the steel-passing gap time threshold of the 10B flying shear, then the steel-passing gap time of the 10B flying shear is too short, and the 10B flying shear is controlled to start automatic breaking.

[0202] ②If the actual steel-passing gap time of the 10B flying shear is greater than or equal to the steel-passing gap time threshold of the 10B flying shear, then the steel-passing gap time of the 10B flying shear is not too short.

[0203] In this embodiment, the operator of the double-high-strength bar mill can stop the breaking process at any time by pulling the button on the control panel in the central control room according to the breakage condition of the billet, and continue to roll the billet normally, which can improve the yield. In addition, when the No. 1 flying shear, No. 6 flying shear, and No. 10 flying shear start automatic breaking, the specific breakage length is determined by the operator of the double-high-strength bar mill.

[0204] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications made to the present invention by those skilled in the art without departing from the spirit of the present invention shall fall within the protection scope of the present invention.

Claims

1. A method of controlling the rolling rhythm of a twin high rod direct rolling process, characterized in that, The method comprises the following steps: 1) setting a target steel feeding time threshold, a target biting steel time threshold and a target gap time threshold; 2) setting a plurality of signal protection coefficients according to the target gap time threshold, and setting a plurality of steel passing gap time thresholds for the flying shears according to the signal protection coefficients, specifically including: 2-1) setting a signal protection coefficient K1 for the 6A flying shear, and setting a steel passing gap time threshold T4 for the 6A flying shear by using the following formula: K1 = (T3-0.5) * V1 / L1 T4 = K1 * L1 / V1 In the formula, K1 is the signal protection coefficient of the 6A flying shear, T3 is the target gap time threshold, T4 is the steel passing gap time threshold of the 6A flying shear, L1 is the distance from the 3A pinch roll to the 6A flying shear, and V1 is the real-time speed of the 6A pinch roll; 2-2) setting a signal protection coefficient K2 for the 6B flying shear, and adjusting the steel passing gap time of the 6B flying shear by using the following formula: K2 = (T3-0.5) * V2 / L2 T5 = K2 * L2 / V2 In the formula, K2 is the signal protection coefficient of the 6B flying shear, T3 is the target gap time threshold, T5 is the steel passing gap time threshold of the 6B flying shear, L2 is the distance from the 3B pinch roll to the 6B flying shear, and V2 is the real-time speed of the 6B pinch roll; 2-3) setting a signal protection coefficient K3 for the 10A flying shear, and adjusting the steel passing gap time of the 10A flying shear by using the following formula: K3 = (T3-0.5) * V3 / L3 T6 = K3 * L3 / V3 In the formula, K3 is the signal protection coefficient of the 10A flying shear, T3 is the target gap time threshold, T6 is the steel passing gap time threshold of the 10A flying shear, L3 is the distance from the finishing 2A to the 10A flying shear, and V3 is the real-time speed of the 10A pinch roll; 2-4) setting a signal protection coefficient K4 for the 10B flying shear, and calculating the steel passing gap time of the 10B flying shear by using the following formula: K4 = (T3-0.5) * V4 / L4 T7 = K4 * L4 / V4 In the formula, K4 is the signal protection coefficient of the 10B flying shear, T3 is the target gap time threshold, T7 is the steel passing gap time threshold of the 10B flying shear, L4 is the distance from the finishing 2B to the 10B flying shear, and V4 is the real-time speed of the 10B pinch roll; 3) taking the plurality of time thresholds set in steps 1) and 2) as control parameters to roll the billets in the double-high-rod straight rolling process, specifically including: 3-1) controlling the steel feeding rhythm by using the target steel feeding time threshold; 3-2) judging whether the billets slip by using the target biting steel time threshold; 3-3) judging whether there is a risk of too short steel passing gap time by using the target gap time threshold; 3-4) dynamically adjusting the protection distances of the flying shears by using the plurality of steel passing gap time thresholds, and judging whether the steel passing gap times of the flying shears are too short.

2. A method of controlling the rolling rhythm in a twin high rod direct rolling process according to claim 1, characterized in that, In step 3-1), the specific method of controlling the steel feeding rhythm by using the target steel feeding time threshold includes: 3-1-1) the continuous casting machine receives the steel feeding signal sent by the rolling mill, and smelts steel, and sends the steel feeding signal to the hot feeding straight rolling table after smelting is completed; 3-1-2) the hot feeding straight rolling table receives the steel feeding signal, sends the steel feeding prohibition signal to the rolling mill, and transports the billets from the continuous casting machine to the rolling mill within the target steel feeding time threshold. 3-1-3) When the tail of the billet leaves the hot check before the straightening roll of the hot straightening and rolling, the hot straightening and rolling roller sends a signal to the rolling mill to release the prohibition of steel; 3-1-4) The rolling mill receives the signal to release the prohibition of steel and waits, and when the waiting time is equal to the threshold value of the steel time, the signal to send steel is sent.

3. A method of controlling the rolling rhythm in a twin high rod direct rolling process according to claim 1, characterized in that, In step 3-2), the specific way of judging whether the billet slips by using the biting time threshold value includes: 3-2-1) Calculate the time of recognizing the head of the billet but not biting the steel at the entrance of the 1# rack; 3-2-2) Compare the time calculated in step 3-2-1) with the biting time threshold value to judge whether the billet slips; ① If the time of recognizing the head of the billet but not biting the steel is ≤ biting time threshold value, the billet does not slip at the entrance of the 1# rack; ② If the time of recognizing the head of the billet but not biting the steel is > biting time threshold value, the billet slips at the entrance of the 1# rack, an alarm signal is sent, the hot straightening and rolling roller sends a signal to the rolling mill to prohibit the steel, the 1# and 2# rollers stop discharging, and the 3# roller reverses to retreat and remove the slipped steel.

4. A method of controlling the rolling rhythm in a twin high rod direct rolling process according to claim 1, characterized in that, In step 3-3), the specific way of judging whether there is a risk of too short over-steel gap time by using the target gap time threshold value includes: 3-3-1) Calculate the actual over-steel gap time of the billet passing through the 1# rack and the 6# rack respectively; 3-3-2) Compare the actual over-steel gap time of the billet passing through the 1# rack with the target gap time threshold value to judge whether the over-steel gap time of the 1# rack is too short: ① If the actual over-steel gap time of the 1# rack is < target gap time threshold value-0.5, the billet may have a risk of too short over-steel gap time, and an alarm signal is sent; ② If the actual over-steel gap time of the 1# rack is ≥ target gap time threshold value-0.5, the billet does not have a risk of too short over-steel gap time; 3-3-3) Compare the actual over-steel gap time of the billet passing through the 6# rack with the target gap time threshold value to judge whether the billet needs to be broken; ① If the actual over-steel gap time of the 6# rack is < target gap time threshold value, control the 1# flying shear to start automatic breaking; ② If the actual over-steel gap time of the 6# rack is ≥ target gap time threshold value, do not automatically break the billet.

5. A method of controlling the rolling rhythm in a twin high rod direct rolling process according to claim 1, characterized in that, In step 3-4), the specific way of dynamically adjusting the protection distance of each flying shear by using a plurality of over-steel gap time threshold values and judging whether the over-steel gap time of each flying shear is too short includes: 3-4-1) Dynamically adjust the protection distance of each flying shear by using a plurality of over-steel gap time threshold values; 3-4-2) Calculate the actual over-steel gap time of the billet passing through the 6A flying shear, 6B flying shear, 10A flying shear and 10B flying shear respectively; 3-4-3) Compare the actual over-steel gap time of the billet passing through the 6A flying shear with the 6A flying shear over-steel gap time threshold value to judge whether the 6A flying shear over-steel gap time is too short: ① If the actual over-steel gap time of the 6A flying shear is < 6A flying shear over-steel gap time threshold value, the 6A flying shear over-steel gap time is too short, and the 6A flying shear is controlled to start automatic breaking; ② If the actual over-steel gap time of the 6A flying shear is ≥ 6A flying shear over-steel gap time threshold value, the 6A flying shear over-steel gap time is not too short. 3-4-4) comparing the actual billet passing gap time of the 6B flying shear with the 6B flying shear billet passing gap time threshold value, judging whether the 6B flying shear billet passing gap time is too short: ① if the 6B flying shear actual billet passing gap time < the 6B flying shear billet passing gap time threshold value, the 6B flying shear billet passing gap time is too short, controlling the 6B flying shear to start automatic breaking; ② if the 6B flying shear actual billet passing gap time ≥ the 6B flying shear billet passing gap time threshold value, the 6B flying shear billet passing gap time is not too short; 3-4-5) comparing the actual billet passing gap time of the 10A flying shear with the 10A flying shear billet passing gap time threshold value, judging whether the 10A flying shear billet passing gap time is too short: ① if the 10A flying shear actual billet passing gap time < the 10A flying shear billet passing gap time threshold value, the 10A flying shear billet passing gap time is too short, controlling the 10A flying shear to start automatic breaking; ② if the 10A flying shear actual billet passing gap time ≥ the 10A flying shear billet passing gap time threshold value, the 10A flying shear billet passing gap time is not too short; 3-4-6) comparing the actual billet passing gap time of the 10B flying shear with the 10B flying shear billet passing gap time threshold value, judging whether the 10B flying shear billet passing gap time is too short: ① if the 10B flying shear actual billet passing gap time < the 10B flying shear billet passing gap time threshold value, the 10B flying shear billet passing gap time is too short, controlling the 10B flying shear to start automatic breaking; ② if the 10B flying shear actual billet passing gap time ≥ the 10B flying shear billet passing gap time threshold value, the 10B flying shear billet passing gap time is not too short.

6. A method of controlling the rolling rhythm in a twin high rod direct rolling process according to claim 5, characterized in that, In step 3-4-1), the specific way of dynamically adjusting the protection distance of each flying shear by using a plurality of billet passing gap time threshold values comprises: ① setting the protection distance of the 6A flying shear as K1*L1; In the formula, K1 is the signal protection coefficient of the 6A flying shear, and L1 is the distance from the 3A pinch roll to the 6A flying shear; ② setting the protection distance of the 6B flying shear as K2*L2; In the formula, K2 is the signal protection coefficient of the 6B flying shear, and L2 is the distance from the 3B pinch roll to the 6B flying shear; ③ setting the protection distance of the 10A flying shear as K3*L3; In the formula, K3 is the signal protection coefficient of the 10A flying shear, and L3 is the distance from the finishing 2A to the 10A flying shear; ④ setting the protection distance of the 10B flying shear as K4*L4; In the formula, K4 is the signal protection coefficient of the 10B flying shear, and L4 is the distance from the finishing 2B to the 10B flying shear.

7. A method of controlling the rolling rhythm in a twin high rod direct rolling process according to claim 1, characterized in that, The target gap time threshold value has a value range of 3-4s.

8. A method of controlling the rolling rhythm in a twin high rod direct rolling process according to claim 1, characterized in that, The bite time threshold value has a value range of 5-6s.

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