Steel feeding rhythm optimization control method and system for direct rolling of high-temperature square billets without heating

Abstract

The present invention provides a method and system for optimizing the steel feeding rhythm control of non-heating direct rolling of high-temperature square billets, which solves the problem of low direct rolling rate of existing non-heating direct rolling of high-temperature square billets. The steel feeding rhythm optimization control model is combined with the production process of non-heating direct rolling of high-temperature square billets, thereby increasing the application scope of the non-heating direct rolling of high-temperature square billets and improving the direct rolling rate of high-temperature square billets. It includes the following: Step 1: continuous casting billet state data collection; Step 2: data processing; Step 3: steel feeding rhythm optimization control model: including (1) continuous casting billet rollable discrimination threshold model; (2) steel feeding rhythm optimization model, the steel feeding order is carried out from small to large according to the value in the billet feeding rhythm optimization matrix, if the value of the j-th stream of the billet feeding rhythm optimization matrix is ​​less than the billet removal threshold, the j-th stream of continuous casting billets is removed.

Description

Technical Field

[0001] The invention relates to the technical field of long profile preparation technology, and in particular to a steel feeding rhythm optimization control method and system for directly rolling high-temperature square billets without heating. Background Art

[0002] Direct rolling of high-temperature billets without heating means that the continuous casting billets do not need any online heating device after leaving the continuous casting machine and directly enter the rolling mill for rolling. The rolling production efficiency of direct rolling of high-temperature billets without heating mainly depends on whether the temperature of the continuous casting billets before reaching the first rolling mill meets the minimum rolling temperature requirement of the rolling mill.

[0003] At present, in the process of direct rolling of high-temperature square billets without heating, due to the unreasonable rules of continuous casting square billet transportation, especially in the case of four machines and four streams of continuous casting machines for one rolling line, or five machines and five streams for one rolling line, not only the direct rolling rate of high-temperature square billets is low, but also the working efficiency of the rolling mill is low.

[0004] The present invention provides a method for optimizing the steel feeding rhythm control for direct rolling of high-temperature billets without heating, and the method comprises the following steps: collecting data on the status of high-temperature billets, collecting and processing data on the transportation of high-temperature billets, and optimizing the steel feeding rhythm control model. The advantage is that a steel feeding rhythm optimization algorithm is used to determine the optimal steel feeding sequence for the continuous casting machine when three machines and three streams are used for one rolling line, four machines and four streams are used for one rolling line, and five machines and five streams are used for one rolling line. The method can effectively improve the direct rolling rate without relying on any online heating device. Summary of the invention

[0005] In order to solve the technical problems raised by the background technology, the present invention provides a method and system for optimizing the steel feeding rhythm control of direct rolling of high-temperature square billets without heating, which solves the problem of low direct rolling rate of existing direct rolling of high-temperature square billets without heating. The steel feeding rhythm optimization control model is combined with the production process of direct rolling of high-temperature square billets without heating, thereby increasing the application scope of the process of direct rolling of high-temperature square billets without heating and improving the direct rolling rate of high-temperature square billets.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A method for optimizing and controlling the steel feeding rhythm of directly rolling high-temperature square billets without heating comprises the following steps:

[0008] Step 1: Data collection of continuous casting billet status, including data collection of temperature changes over time, speed, steel signal collection, and the time t taken by the first rolling mill to roll a continuous casting billet during the continuous casting billet transportation process. roll The collection of

[0009] Step 2: Process the temperature variation over time and speed data collected in step 1 during the continuous casting billet transportation process to obtain the maximum waiting time t when the continuous casting billet reaches the end position of the continuous casting machine. max and the time t required for the continuous casting billet to reach the first rolling mill from the end of the continuous casting machine trans ;

[0010] Step 3: Steel delivery rhythm optimization control model:

[0011] (1) Threshold model for determining the rollability of continuous casting billets:

[0012]

[0013]

[0014]

[0015] Among them, t max is the maximum waiting time for the continuous casting billet to reach the end position of the continuous casting machine, f(t roll , t trans ) is the time t taken by the first rolling mill to roll a continuous casting billet roll and the time t required for the continuous casting billet to be transported from the end of the continuous casting machine to the first rolling mill trans The related function, f(t trans ) is the function of the time required for the continuous casting billet to be transported from the end of the continuous casting machine to the first rolling mill, b is the threshold for judging whether the continuous casting billet can be rolled, r is equal to No, the continuous casting billet cannot be rolled, and r is equal to Yes, the continuous casting billet can be rolled, where, is the maximum instantaneous waiting time for continuous casting billet, The x in the formula is the continuous casting machine stream number. The y in the equation is the number of iterations, where F t is the blank removal threshold;

[0016] (2) Steel delivery rhythm optimization model:

[0017] When the rolling mill sends a signal to demand steel, the continuous casting billets at the end of the continuous casting machine are judged one by one, and the judgment model is:

[0018]

[0019] Among them, M xy is the steel feeding rhythm optimization matrix, x is the continuous casting machine stream number, and the steel feeding order is carried out according to the value in the billet feeding rhythm optimization matrix from small to large. If the value M of the jth stream in the billet feeding rhythm optimization matrix is jy <F t , the billet removal operation is performed on the j-th stream continuous casting billet.

[0020] Furthermore, in step 1, the collected data includes:

[0021] (1) Collection of temperature changes over time during the transportation of continuous casting billets: A handheld infrared thermometer is used to measure the temperature of the continuous casting billets at different times and positions in the area from the exit of the second cooling zone of the continuous casting machine to the area in front of the first rolling mill, and the temperature drop data of the continuous casting high-temperature billets over time are obtained;

[0022] (2) Speed ​​data collection: The speed data collection of continuous casting billet consists of three parts, including the following: ① Before the continuous casting billet is cut: the speed data of the continuous casting billet v fc By collecting the billet drawing speed of the continuous casting machine; ② After the continuous casting billet is cut: the speed data of the continuous casting billet v bc By collecting the speed of the roller drive roller; ③ From the end of the continuous casting machine to the first rolling mill: continuous casting billet speed data v trans The collection is carried out through the speed of the transmission roller of the fast conveying roller;

[0023] (3) Signal collection of steel demand at the rolling mill: A hot metal detector is set up in front of the first rolling mill to measure whether the first rolling mill is rolling high-temperature square billets. When the hot metal detector in front of the first rolling mill does not detect hot metal, the first rolling mill is not rolling high-temperature square billets. At this time, the first rolling mill is in a steel demand state;

[0024] (4) The time taken by the first rolling mill to roll a continuous casting billet is collected: the duration t of the hot metal detected by the hot metal detector in front of the first rolling mill is roll .

[0025] Furthermore, the step 1 also includes collecting temperature data at specific positions: setting up infrared thermometers at the exit position of the second cooling zone of the continuous casting machine and at the end position of the continuous casting machine to measure the surface temperature data of the square billet at the corresponding positions; used to verify the collection of temperature changes over time during the transportation process of the continuous casting square billet.

[0026] Furthermore, the step 2 comprises the following steps:

[0027] (1) Temperature data processing during the conveying process: The temperature drop data of the continuous casting high-temperature square billet obtained in step 1 that changes with time are subjected to data fitting, wherein the data fitting method is:

[0028]

[0029] Where T(t) is the surface temperature of the high temperature billet at different times, a i (i=0, 1, 2, 3, ..., n) is the polynomial weight coefficient, t is the time;

[0030] (2) Determine the minimum rolling temperature T of the rolling mill min ;

[0031] (3) Continuous casting billet speed data v before cutting fc The time t required for the tail of the continuous casting billet to reach the cutting position is obtained fc ;

[0032] (4) Speed ​​data v of the continuous casting billet after cutting from the continuous casting billet bc The time t required for the head of the continuous casting billet to reach the end of the continuous casting machine is obtained bc ;

[0033] (5) Continuous casting billet speed data v from the end of the continuous casting machine to the first rolling mill trans The time t required for the continuous casting billet to reach the first rolling mill from the end of the continuous casting machine is obtained trans ;

[0034] (6) According to the temperature value T when the continuous casting billet reaches the end position of the continuous casting machine cf =T(t fc +t bc ), t fc is the time required for the tail of the continuous casting billet to reach the cutting position, t bc It is the time required for the head of the continuous casting billet to reach the end of the continuous casting machine after the billet is cut off; combined with the fitted temperature-time curve, the maximum waiting time t of the continuous casting billet to reach the end of the continuous casting machine is determined max , that is, the billet temperature T cf Reduce to T min Time required.

[0035] The present invention also provides a steel feeding rhythm optimization control system for directly rolling high-temperature square billets without heating, which comprises a data acquisition module, a data processing module and a control module.

[0036] The data acquisition module comprises:

[0037] Infrared thermometers are installed at the exit of the secondary cooling zone of the continuous casting machine and at the end of the continuous casting machine.

[0038] The handheld infrared thermometer is used to measure the temperature in the area from the exit of the secondary cooling zone of the continuous casting machine to the area before the first rolling mill.

[0039] Continuous casting billet speed collection: collected through the continuous casting machine billet drawing speed or the roller table drive roller speed.

[0040] Signal collection of steel demand at the rolling mill: a hot metal detector is set up in front of the first rolling mill to measure whether the first rolling mill is rolling high-temperature square billets. When the hot metal detector in front of the first rolling mill does not detect hot metal, the first rolling mill is not rolling high-temperature square billets. At this time, the first rolling mill is in the state of steel demand.

[0041] The time taken by the first rolling mill to roll a continuous casting billet: the duration during which the hot metal is detected by the hot metal detector at the front position of the first rolling mill.

[0042] The data processing module receives the data from the data acquisition module for data processing, including the temperature change data and speed data during the continuous casting billet transportation process, and obtains the maximum waiting time t when the continuous casting billet reaches the end position of the continuous casting machine. max and the time t required for the continuous casting billet to reach the first rolling mill from the end of the continuous casting machine trans ;

[0043] The control module calculates the data collected by the data collection module and the data obtained by the data processing module according to the above method, and optimizes the steel feeding rhythm of the high-temperature square billet directly rolled without heating.

[0044] Compared with the prior art, the present invention has the following beneficial effects:

[0045] The steel feeding rhythm optimization control method for direct rolling of high-temperature square billets without heating of the present invention can effectively improve the direct rolling rate of high-temperature square billets compared with the problem of low direct rolling rate of existing direct rolling of high-temperature square billets without heating, and is more suitable for the production practice of direct rolling of high-temperature square billets without heating.

[0046] The present invention uses a steel feeding rhythm optimization model and combines the continuous casting billet state data to obtain a reasonable conveying sequence of the continuous casting high-temperature billets to the rolling mill, thereby effectively reducing the billet rejection rate of the continuous casting high-temperature billets. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 Schematic diagram of the overall structure of high-temperature billet for direct rolling without heating;

[0048] Figure 2 It is a schematic diagram of the infrared thermometer of the present invention at a specific position of the continuous casting machine;

[0049] Figure 3 This is a diagram of a steel feeding rhythm optimization control system for direct rolling of high-temperature square billets without heating according to the present invention.

[0050] In the figure: 1-crystallizer 2-second cooling zone 3-tension straightener 4-shearing zone 5-end of continuous casting machine 6-fast transfer roller 7-first rolling mill 8-infrared thermometer. DETAILED DESCRIPTION

[0051] The specific implementation modes provided by the present invention are described in detail below with reference to the accompanying drawings.

[0052] Figure 1 Shows the overall structure of high-temperature square billet directly rolled without heating.

[0053] According to one embodiment of the present invention, a method for optimizing the steel feeding rhythm for direct rolling of high-temperature square billets without heating may include:

[0054] 1. Continuous casting billet status data collection

[0055] HRB400E high-temperature square billets are produced on a rolling line using a four-machine four-strand continuous casting machine. The billet size is 150mm×150mm×10000mm.

[0056] (1) Collection of temperature changes over time during the transportation of continuous casting billets: The temperature of the continuous casting billets at different times and positions is measured by a handheld infrared thermometer in the area from the exit of the second cooling zone 2 of the continuous casting machine to the front of the first rolling mill 7, and the temperature drop data of the continuous casting high-temperature billets over time are obtained.

[0057] (2) Temperature data collection at specific locations: Infrared thermometers 8 are set up at the exit of the secondary cooling zone 2 of the continuous casting machine and at the end 5 of the continuous casting machine to measure the surface temperature data of the square billet at the corresponding positions. The temperature measurement frequency is 10 times / s. Figure 2 The infrared thermometer 8 is shown as an example at the outlet of the second cooling zone 2 of the continuous casting machine and at the end 5 of the continuous casting machine. The measuring range of the infrared thermometer 8 can be 800-1300° C. It is used to collect and verify the temperature change over time during the continuous casting billet transportation process.

[0058] (3) Speed ​​data collection: The speed data collection of continuous casting billet consists of three parts, including the following: ① Before the continuous casting billet is cut: the speed data of the continuous casting billet v fc By collecting the billet drawing speed of the continuous casting machine; ② After the continuous casting billet is cut: the speed data of the continuous casting billet v bc By collecting the speed of the roller drive roller; ③ Continuous casting machine end 5 to the first rolling mill 7: continuous casting billet speed data v trans The data is collected by the rotation speed of the drive roller of the fast conveying roller 6; in this example, the speed of the continuous casting billet before cutting is 2.6m / min, the speed of the continuous casting billet after cutting is 5.2m / min, and the average speed of the continuous casting billet from the end 5 of the continuous casting machine to the first rolling mill 7 is 120m / min.

[0059] (4) Signal collection of steel demand at the rolling mill: A hot metal detector is set up in front of the first rolling mill 7 to measure whether the first rolling mill is rolling high-temperature square billets. When the hot metal detector in front of the first rolling mill 7 does not detect hot metal, the first rolling mill 7 is not rolling high-temperature square billets. At this time, the first rolling mill 7 is in a steel demand state.

[0060] (5) The time taken by the first rolling mill 7 to roll a continuous casting billet is: the duration t of the hot metal detected by the hot metal detector at the front position of the first rolling mill 7roll In this example, the first rolling mill 7 completes the duration t of rolling a continuous casting high-temperature billet roll It is 31s.

[0061] 2. Data processing

[0062] (1) Temperature data processing during the conveying process: The temperature drop data of the continuous casting high-temperature square billet changing with time is obtained and data fitting is performed, wherein the data fitting method is:

[0063]

[0064] Where T(t) is the surface temperature of the high temperature billet at different times, a i (i=0, 1, 2, 3, ..., n) is the polynomial weight coefficient, and t is the time.

[0065] (2) Minimum rolling temperature data collection: Determine the minimum rolling temperature value T of the rolling mill min In this example, the minimum rolling temperature of the rolling mill is T min It is 960℃.

[0066] (3) Continuous casting billet speed data v before cutting fc The time t required for the tail of the continuous casting billet to reach the cutting position is obtained fc ;

[0067] (4) Speed ​​data v of the continuous casting billet after cutting from the continuous casting billet bc The time t required for the head of the continuous casting billet to reach the end 5 of the continuous casting machine is obtained. bc ;

[0068] (5) The speed data v of the continuous casting billet from the end of the continuous casting machine 5 to the first rolling mill 7 trans The time t required for the continuous casting billet to reach the first rolling mill from the end of the continuous casting machine is obtained trans .

[0069] (6) According to the temperature value T when the continuous casting billet reaches the end 5 of the continuous casting machine cf =T(t fc +t bc ), combined with formula (1), determine the maximum waiting time t when the continuous casting billet reaches the end 5 position of the continuous casting machine max , that is, the billet temperature T cf Reduce to T min Time required.

[0070] 3. Steel delivery rhythm optimization control model

[0071] (1) Threshold model for determining the rollability of continuous casting billets:

[0072]

[0073]

[0074]

[0075] Among them, f(t roll , t trans ) is a function of the time taken by the first rolling mill 7 to roll a continuous casting billet and the time required for the continuous casting billet to be transported from the end 5 of the continuous casting machine to the first rolling mill 7, where f(t trans ) is the function of the time required for the continuous casting billet to be transported from the end 5 of the continuous casting machine to the first rolling mill 7, b is the threshold for judging whether the continuous casting billet can be rolled, which is equal to No for the continuous casting billet cannot be rolled, and equal to Yes for the continuous casting billet can be rolled, wherein, is the maximum instantaneous waiting time for continuous casting billet, The x in the figure is the number of each stream of the continuous casting machine. The y in the equation is the number of iterations, where F t It is the threshold for removing blanks, and its value is 0.

[0076] (2) Steel delivery rhythm optimization model

[0077] When the rolling mill sends a steel signal, the continuous casting billets at the end 5 of the continuous casting machine are judged one by one, wherein the judgment model is:

[0078]

[0079] Among them, M xy is the steel feeding rhythm optimization matrix, x is the number of continuous casting machine streams, and the steel feeding order is carried out according to the value in the billet feeding rhythm optimization matrix from small to large. If the value M of the jth stream in the billet feeding rhythm optimization matrix is jy <F t Formula (6) is used to remove the billet from the j-th continuous casting stream.

[0080] The present invention provides that the oxide scale on the surface of the continuous casting high temperature square billet should be removed at the outlet of the second cooling zone 2 of the continuous casting machine and at the end 5 of the continuous casting machine. The oxide scale on the surface of the continuous casting high temperature square billet should be removed at different times and positions in the area from the outlet of the second cooling zone 2 of the continuous casting machine to the first rolling mill 7.

[0081] The present invention also provides a steel feeding rhythm optimization control system for directly rolling high-temperature square billets without heating. According to one embodiment of the present invention, Figure 3 The structure of the steel feeding rhythm optimization control system for direct rolling of high-temperature square billets without heating is shown, including a data acquisition module, a data processing module, and a control module.

[0082] The data acquisition module comprises:

[0083] (1) Infrared thermometers 8 are installed at the exit of the secondary cooling zone 2 of the continuous casting machine and at the end 5 of the continuous casting machine.

[0084] (2) A handheld infrared thermometer is used to measure the temperature in the area from the exit of the second cooling zone 2 of the continuous casting machine to the area before the first rolling mill 7;

[0085] (3) Continuous casting billet speed collection: The data is collected through the billet drawing speed of the continuous casting machine or the speed of the roller drive roller.

[0086] (4) Signal collection of steel demand at the rolling mill: A hot metal detector is set up in front of the first rolling mill 7 to measure whether the first rolling mill 7 is rolling high-temperature square billets. When the hot metal detector in front of the first rolling mill 7 does not detect hot metal, the first rolling mill 7 is not rolling high-temperature square billets. At this time, the first rolling mill 7 is in a steel demand state.

[0087] (5) The time taken by the first rolling mill 7 to roll a continuous casting billet is the duration during which the hot metal is detected by the hot metal detector at the front position of the first rolling mill 7.

[0088] The data processing module receives the data from the data acquisition module for data processing, including the temperature change data over time and the speed data during the continuous casting billet transportation process, and obtains the maximum waiting time t when the continuous casting billet reaches the end 5 position of the continuous casting machine. max and the time t required for the continuous casting billet to reach the first rolling mill 7 from the end 5 of the continuous casting machine trans .

[0089] The control module calculates the data collected by the data collection module and the data obtained by the data processing module according to the above method, and optimizes the steel feeding rhythm of the high-temperature square billet directly rolled without heating.

[0090] From the above technical solution, it can be seen that the steel feeding rhythm optimization control method and system of the present invention for direct rolling of high-temperature square billets without heating can effectively improve the direct rolling rate of high-temperature square billets compared with the problem of low direct rolling rate of existing direct rolling of high-temperature square billets without heating, and is more suitable for the production practice of direct rolling of high-temperature square billets without heating.

[0091] The above embodiments are implemented based on the technical solution of the present invention, and detailed implementation methods and specific operation processes are given, but the protection scope of the present invention is not limited to the above embodiments. The methods used in the above embodiments are conventional methods unless otherwise specified.

Claims

1. A method for optimizing the feeding rhythm of steel for direct rolling of high-temperature square billets without heating, characterized in that: The steps include: Step 1: Data collection of continuous casting billet status, including data collection of temperature changes over time, speed, steel signal collection, and the time t taken by the first rolling mill to roll a continuous casting billet during the continuous casting billet transportation process. roll The collection of Step 2: Process the temperature variation over time and speed data collected in step 1 during the continuous casting billet transportation process to obtain the maximum waiting time t when the continuous casting billet reaches the end position of the continuous casting machine. max and the time t required for the continuous casting billet to reach the first rolling mill from the end of the continuous casting machine trans ; Step 3: Steel delivery rhythm optimization control model: (1) Threshold model for determining the rollability of continuous casting billets: Among them, t max is the maximum waiting time for the continuous casting billet to reach the end position of the continuous casting machine, f(t roll ,t trans ) is the time t taken by the first rolling mill to roll a continuous casting billet roll and the time t required for the continuous casting billet to be transported from the end of the continuous casting machine to the first rolling mill trans The related function, f(t trans ) is the function of the time required for the continuous casting billet to be transported from the end of the continuous casting machine to the first rolling mill, b is the threshold for judging whether the continuous casting billet can be rolled, r is equal to No, the continuous casting billet cannot be rolled, and r is equal to Yes, the continuous casting billet can be rolled, where, is the maximum instantaneous waiting time for continuous casting billet, The x in the formula is the continuous casting machine stream number. The y in the equation is the number of iterations, where F t is the blank removal threshold; (2) Steel delivery rhythm optimization model: When the rolling mill sends a signal to demand steel, the continuous casting billets at the end of the continuous casting machine are judged one by one, and the judgment model is: Among them, M xy is the steel feeding rhythm optimization matrix, x is the continuous casting machine stream number, and the steel feeding order is carried out according to the value in the billet feeding rhythm optimization matrix from small to large. If the value M of the jth stream in the billet feeding rhythm optimization matrix is jy <F t , the billet removal operation is performed on the j-th stream continuous casting billet.

2. The method for optimizing the steel feeding rhythm of direct rolling of high-temperature square billets without heating according to claim 1 is characterized in that: In step 1, the collected data includes: (1) Collection of temperature changes over time during the transportation of continuous casting billets: A handheld infrared thermometer is used to measure the temperature of the continuous casting billets at different times and positions in the area from the exit of the second cooling zone of the continuous casting machine to the area in front of the first rolling mill, and the temperature drop data of the continuous casting high-temperature billets over time are obtained; (2) Speed ​​data collection: The speed data collection of continuous casting billet includes the following: ① Before cutting the continuous casting billet: speed data v fc By collecting the billet drawing speed of the continuous casting machine; ② After the continuous casting billet is cut: the speed data of the continuous casting billet v bc By collecting the speed of the roller drive roller; ③ From the end of the continuous casting machine to the first rolling mill: continuous casting billet speed data v trans The collection is carried out through the speed of the transmission roller of the fast conveying roller; (3) Signal collection of steel demand at the rolling mill: A hot metal detector is set up in front of the first rolling mill to measure whether the first rolling mill is rolling high-temperature square billets. When the hot metal detector in front of the first rolling mill does not detect hot metal, the first rolling mill is not rolling high-temperature square billets. At this time, the first rolling mill is in a steel demand state; (4) The time taken by the first rolling mill to roll a continuous casting billet is collected: the duration t of the hot metal detected by the hot metal detector in front of the first rolling mill is roll .

3. The method for optimizing the steel feeding rhythm of direct rolling of high-temperature square billets without heating according to claim 2 is characterized in that: The step 1 also includes collecting temperature data at specific positions: setting up infrared thermometers at the exit of the second cooling zone of the continuous casting machine and at the end of the continuous casting machine to measure the surface temperature data of the square billet at the corresponding positions; used to verify the temperature change over time during the transportation of the continuous casting square billet.

4. The method for optimizing the steel feeding rhythm of direct rolling of high-temperature square billets without heating according to claim 1 is characterized in that: The step 2 comprises the following steps: (1) Temperature data processing during the conveying process: The temperature drop data of the continuous casting high-temperature square billet obtained in step 1 that changes with time are subjected to data fitting, wherein the data fitting method is: Where T(t) is the surface temperature of the high temperature billet at different times, a i (i=0,1,2,3,…,n) is the polynomial weight coefficient, t is the time; (2) Determine the minimum rolling temperature T of the rolling mill min ; (3) Continuous casting billet speed data v before cutting fc The time t required for the tail of the continuous casting billet to reach the cutting position is obtained fc ; (4) Speed ​​data v of the continuous casting billet after cutting from the continuous casting billet bc The time t required for the head of the continuous casting billet to reach the end of the continuous casting machine is obtained bc ; (5) Continuous casting billet speed data v from the end of the continuous casting machine to the first rolling mill trans The time t required for the continuous casting billet to reach the first rolling mill from the end of the continuous casting machine is obtained rans ; (6) According to the temperature value T when the continuous casting billet reaches the end position of the continuous casting machine cf =T(t fc +t bc ), t fc is the time required for the tail of the continuous casting billet to reach the cutting position, t bc It is the time required for the head of the continuous casting billet to reach the end of the continuous casting machine after the billet is cut off; combined with the fitted temperature-time curve, the maximum waiting time t of the continuous casting billet to reach the end of the continuous casting machine is determined max , that is, the billet temperature T cf Reduce to T min Time required.

5. A steel feeding rhythm optimization control system for direct rolling of high-temperature square billets without heating, characterized in that: It includes data acquisition module, data processing module and control module; The data acquisition module comprises: Infrared thermometers installed at the exit of the secondary cooling zone of the continuous casting machine and at the end of the continuous casting machine; The handheld infrared thermometer is used to measure the temperature in the area from the exit of the secondary cooling zone of the continuous casting machine to the area before the first rolling mill; Continuous casting billet speed collection: collect data through the billet drawing speed of the continuous casting machine or the speed of the roller drive roller; Signal collection of steel demand from rolling mill: a hot metal detector is set up in front of the first rolling mill to measure whether the first rolling mill is rolling high-temperature square billets. When the hot metal detector in front of the first rolling mill does not detect hot metal, the first rolling mill is not rolling high-temperature square billets, and the first rolling mill is in a state of steel demand; The time taken by the first rolling mill to roll a continuous casting billet is the duration of the hot metal being detected by the hot metal detector in front of the first rolling mill; The data processing module receives the data from the data acquisition module for data processing, including the temperature change data and speed data during the continuous casting billet transportation process, and obtains the maximum waiting time t when the continuous casting billet reaches the end position of the continuous casting machine. max and the time t required for the continuous casting billet to reach the first rolling mill from the end of the continuous casting machine trans ; The control module calculates the data collected by the data collection module and the data obtained by the data processing module according to the method described in claim 1, and optimizes the steel feeding rhythm of the high-temperature square billet directly rolled without heating.

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