Method for transferring the casting sequence of a billet between direct rolling steelmaking and rolling

Abstract

The application discloses a steel billet continuous casting flow number transmission method based on direct rolling steelmaking and rolling, and a method for sequentially transmitting the information of the steelmaking continuous casting billet flow number and the corresponding continuous casting billet gauge, temperature, furnace number and the like to the cold bed length measuring system through a series of detection elements, rolling current and other signals; specifically, when the direct rolling PLC identifies the continuous casting billet flow number, the steel billet gauge, temperature, furnace number and the like of the continuous casting billet corresponding to the flow number are received through the network communication between the steelmaking PLC system and the direct rolling PLC system, and then all the information is transmitted to the main rolling line PLC system; the main rolling line PLC system sequentially transmits according to the rolling direction of the steel billet, so that the steel billet in rolling and the flow number and other information are one-to-one corresponding, and finally the flow number and other information are transmitted to the length measuring system, thereby providing the data basis for the subsequent steelmaking continuous casting billet gauge.

Description

Technical Field

[0001] This invention belongs to the field of rolling technology and relates to a method for transferring the billet continuous casting sequence number between direct rolling steelmaking and rolling. Background Technology

[0002] In steel enterprises producing rebar, to improve the fixed-length yield, a fixed weight is specified for the rolled steel billets. The aim is to control the length of the billet to a certain level, achieving full fixed-length cutting (the free section length of the last cut is a multiple of 9 meters), reducing cutting losses, and increasing the yield. Although continuous casting achieves fixed-length cutting, the fixed weight of continuously cast billets is affected by factors such as molten steel pouring temperature, casting speed, tundish liquid level, steel throughput in the crystallizer tube, and changes in cooling water volume. This results in significant variations in billet weight. During continuous billet production, the maximum weight of a single billet can reach a certain level. The difference is 20kg; however, the process conditions of each continuous casting run are not consistent, and the weight of each run is also different. Therefore, it is necessary to transmit the information such as the run number, length, temperature, and furnace number of the continuous casting billet in the rolling process through the straight rolling roller table, the furnace roller table, the No. 3 rolling mill, the No. 8 rolling mill, and the No. 18 rolling mill in sequence to the finished steel. Then, the length measuring system measures the length of the tail steel of the finished steel. The PLC system transmits the tail steel length of this steel (converted to weight based on the weight per meter), as well as the corresponding run number and adjusted weight, to the continuous casting shearing machine of that run in steelmaking.

[0003] The approximate solution mainly adjusts the weight of the entire continuous casting flow by weighing. However, it lacks flow number identification and transmission, making it impossible to adjust the weight of the corresponding continuous casting billet based on the flow number, resulting in large errors in billet weight adjustment.

[0004] The drawback of existing technologies is the lack of flow number identification and transmission. Instead, the weight of the continuous casting billet is adjusted by weighing, resulting in large weight differences and poor billet fixed-length ratio. The technical problem to be solved by this invention is how to transmit the flow number and other information after the direct rolling PLC detects the flow number, and finally transmit it to the length measurement system. This provides the prerequisite for adjusting the weight of the corresponding flow number continuous casting billet by measuring the tail steel length, thus achieving full fixed-length casting. Summary of the Invention

[0005] The purpose of this invention is to provide a billet continuous casting serial number transfer method based on direct rolling steelmaking and rolling, which solves the problems of no serial number identification and no serial number transfer in the prior art.

[0006] The technical solution adopted in this invention is based on a method for transmitting billet continuous casting flow numbers between direct rolling steelmaking and rolling. When the direct rolling PLC system identifies the continuous casting billet flow number, it receives information through network communication between the steelmaking PLC system and the direct rolling PLC system. The network communication receives the billet parameter information corresponding to the continuous casting billet flow number. Subsequently, the direct rolling PLC system transmits the information sequentially according to the rolling direction of the billet, so that the billet in the rolling process corresponds one-to-one with the continuous casting billet flow number and billet parameter information. Finally, the continuous casting billet flow number and billet parameter information are transmitted to the finished steel product.

[0007] The invention is further characterized by:

[0008] The billet continuous casting sequence transfer method based on direct rolling steelmaking and rolling is implemented in the following steps:

[0009] Step 1: Selection of stream signal and establishment of data blocks;

[0010] Step 2: Detect the sequence number and save it to the data block created in Step 1;

[0011] Step 3: The billet continues to move, and the serial number begins to be transmitted;

[0012] Step 4: Install a hot metal detection element at the entrance of the straight rolling mill. When the billet passes the hot metal detection element, save the signal stored at the previous signal transmission point to the data block at the entrance of the straight rolling mill, and transmit the signal to the entrance of the straight rolling mill.

[0013] Step 5: Install hot metal detection elements at the roller table in front of No. 1 rolling mill. When the billet passes through the hot metal detection elements, save the billet information stored at the previous signal transmission point to the data block in front of No. 1 rolling mill, and transmit the stream number to the front of No. 1 rolling mill.

[0014] Step 6: When the billet bites into the No. 1 rolling mill, rolling begins. When the billet bites into the No. 3 rolling mill, the current of the No. 3 rolling mill exceeds the threshold. After the direct rolling PLC system detects the biting current signal, it saves the billet information of the billet bitten into the No. 3 rolling mill to the No. 3 rolling mill data block, and transmits the flow number to the No. 3 rolling mill. The billet continues to be rolled.

[0015] Step 7: When the billet bites into the No. 8 rolling mill, the current of the No. 8 rolling mill exceeds the threshold. After the direct rolling PLC system detects the biting current signal, it saves the billet information at the No. 8 rolling mill from the previous signal transmission point to the No. 8 rolling mill data block, and transmits the flow number to the No. 8 rolling mill. The billet continues to be rolled.

[0016] Step 8: When the billet bites into the No. 18 rolling mill, the current of the No. 18 rolling mill exceeds the threshold. After the direct rolling PLC system detects the biting current signal, it saves the billet information of the billet biting into the No. 18 rolling mill from the previous signal transmission point to the No. 18 rolling mill data block, and transmits the flow number to the No. 18 rolling mill. The billet continues to be rolled.

[0017] Step 9: After the billet is ejected from the No. 18 rolling mill, it becomes a finished steel product. The direct rolling PLC system detects the disappearance of the No. 18 current signal and transmits the billet information from the previous signal transmission point passed by the billet after being ejected from the No. 8 rolling mill to the finished steel product. At the same time, the length of the tail steel of the finished steel product is measured by the existing length measurement system. The tail steel length is measured once after each billet becomes a finished steel product, and the length data is sent to the direct rolling PLC system.

[0018] Step 10: The direct rolling PLC system saves the information on the finished steel and the length of the tail steel, and displays it on the HMI screen for personnel to observe.

[0019] Step 11: The direct rolling PLC system calculates the billet weight (g) that needs to be adjusted based on the received tail steel length.

[0020] Step 12: The direct rolling PLC system transmits the detected flow number N and the billet weight g to be adjusted to the continuous casting machine control system via TCP / IP network communication. The continuous casting machine control system then adjusts the billet shearing of flow number N based on the received flow number N and billet weight g.

[0021] Step 1 specifically involves adding 8 DB data blocks to the direct rolling PLC system, named as follows: continuous casting billet detection data, direct rolling mill roller table entry data, hot metal detection element data before No. 1 mill, No. 3 mill data, No. 8 mill data, No. 18 mill data, and finished steel data; each DB block contains 4 data items in INT format, named as flow number, fixed length, head temperature, and furnace number.

[0022] Step 2 specifically involves installing N hot metal detection elements at each of the continuous billet movement positions on the steelmaking cooling bed and connecting the signals to the existing direct rolling PLC system via lines.

[0023] The specific working process of step 2 is as follows: When the N-stream steel billet conveyed from the steelmaking process passes the Nth hot metal detection element, the direct rolling PLC system detects the signal. At the same time, the steelmaking continuous casting control system and the direct rolling PLC system communicate through the TCP / IP network to transmit the fixed length, head temperature, and furnace number information corresponding to the N-stream steel billet to the direct rolling PLC system. Subsequently, the direct rolling PLC system writes the data stream number N corresponding to the N-stream steel billet, as well as the fixed length, head temperature, and furnace number, into the four data fields corresponding to the DB data block.

[0024] Step 4 specifically involves: installing a hot metal detector at the entrance of the straight rolling mill. When the billet passes the hot metal detection element, the straight rolling PLC system detects the signal and writes the billet signal from the previous signal detection point, namely the DB block-continuous casting billet detection data block, namely the four data stream numbers N, fixed length, head temperature, and furnace number, into the DB block-straight rolling mill entrance data block. The stream numbers are then transmitted to the entrance of the straight rolling mill.

[0025] Step 11 specifically involves the following steps: The direct-rolling PLC system receives the tail steel length and calculates the billet weight (g) to be adjusted based on the formula: (tail steel length - set length) * standard weight per meter = adjustment weight.

[0026] The beneficial effects of this invention are:

[0027] The billet continuous casting flow number transfer method based on direct rolling steelmaking and rolling of the present invention can display all the dynamic information of the billet in the rolling process, including the flow number of the billet and the corresponding fixed length, temperature, furnace number and other information. It can also provide a data foundation for subsequent adjustment of billet weight based on flow number, stabilize the fixed length rate of rolling, reduce steel cutting loss, improve yield and reduce production cost. Attached Figure Description

[0028] Figure 1 This is a schematic flowchart of the billet continuous casting sequence transfer method based on direct rolling steelmaking and rolling of the present invention. Detailed Implementation

[0029] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0030] This invention provides a method for transferring billet continuous casting serial numbers between direct rolling steelmaking and rolling mill, specifically as described in the following embodiments:

[0031] Example 1

[0032] The core of this invention is to transmit the flow number detected by the direct rolling PLC system and the corresponding continuous casting billet length, temperature, furnace number, and other information sent by the continuous casting PLC system to the finished steel product through a series of detection elements and mill current signals. Then, by measuring the length of the tail steel of the finished steel product, the core basis for adjusting the billet weight is established.

[0033] Example 2

[0034] Based on the billet continuous casting sequence transfer method between direct rolling steelmaking and rolling, such as Figure 1 As shown, please follow these steps:

[0035] Step 1: Select the signal for the flow number transmission. Since rolling a steel billet takes approximately 35-38 seconds, and the time interval for conveying a continuous casting billet in steelmaking is also 35-38 seconds, the billet travel time between continuous hot inspection signals and between continuous rolling mill current signals must be much less than 35-38 seconds to prevent the flow number at the current position from being updated by the next billet before it has been transmitted to the next position. Simultaneously, add 8 DB data blocks to the direct rolling PLC system, named as follows: Continuous Casting Billet Inspection Data, Direct Rolling Mill Roller Entrance Data, No. 1 Mill Pre-rolling Heat Inspection Data, No. 3 Mill Data, No. 8 Mill Data, No. 18 Mill Data, and Finished Steel Data. Each DB block contains 4 data points in INT format, named as Flow Number, Fixed Length, Head Temperature, and Furnace Number.

[0036] Step 2, Flow Number Detection: N hot metal detection elements are installed at each flow position of the continuous casting billet on the steelmaking cooling bed, and the signals are connected to the existing direct rolling PLC system via lines. When the Nth flow of steel billet transported from the steelmaking process passes the Nth hot metal detection element, the direct rolling PLC system detects the signal. Simultaneously, the existing continuous casting control system of the steelmaking process communicates with the direct rolling PLC system via TCP / IP network, transmitting the corresponding length, head temperature, and furnace number information of the Nth flow of steel billet to the direct rolling PLC system. Subsequently, the direct rolling PLC system writes the flow number N, along with the length, head temperature, and furnace number, into the four data points corresponding to the DB block continuous casting billet detection data.

[0037] Step 3, then the billet continues to move, and the serial number begins to be transmitted;

[0038] Step 4: Install a hot metal detection element at the entrance of the straight rolling mill. When the billet passes through the hot metal detection element, the straight rolling PLC system detects the signal and writes the four data stream numbers N, fixed length, head temperature and furnace number from the previous signal transmission point (DB block - continuous casting billet detection data block) into the DB block - straight rolling mill entrance data block. The stream numbers are then transmitted to the entrance of the straight rolling mill.

[0039] Step 5: Install a hot metal detection element at the front roller table of No. 1 rolling mill. When the billet passes through the hot metal detection element, the direct rolling PLC system detects the signal and writes the four data stream numbers N, fixed length, head temperature and furnace number from the previous signal transmission point (DB block - direct rolling roller table entrance data block) into the DB block - front data block of No. 1 rolling mill. The stream numbers are then transmitted to the front of No. 1 rolling mill.

[0040] Step 6: The billet is bitten into the No. 1 rolling mill and rolling begins. When the billet is bitten into the No. 3 rolling mill, the current of the No. 3 rolling mill exceeds the threshold. After the direct rolling PLC system detects the biting current signal, it writes the four data stream numbers N, fixed length, head temperature and furnace number from the previous signal transmission point (DB block - data block before No. 1 rolling mill) into the DB block - data block of No. 3 rolling mill. The stream numbers are then transmitted to the No. 3 rolling mill, and the billet continues to be rolled.

[0041] Step 7: When the billet bites into the No. 8 rolling mill, the current of the No. 8 rolling mill exceeds the threshold. After the direct rolling PLC system detects the bite current signal, it writes the four data stream numbers N, fixed length, head temperature and furnace number from the previous signal transmission point (DB block - No. 3 rolling mill data block) into the DB block - No. 8 rolling mill data block. The stream numbers are then transmitted to the No. 8 rolling mill, and the billet continues to be rolled.

[0042] Step 8: When the billet bites into the No. 18 rolling mill (last stand), the current of the No. 18 rolling mill exceeds the threshold. After the direct rolling PLC system detects the bite current signal, it writes the four data stream numbers N, fixed length, head temperature and furnace number from the previous signal transmission point (DB block - No. 8 rolling mill data block) into the DB block - No. 18 rolling mill data block. The stream numbers are then transmitted to the No. 18 rolling mill, and the billet continues to be rolled.

[0043] Step 9: After the billet is ejected from the 18# mill (the last mill), it becomes finished steel. The PLC system detects the disappearance of the 18# current signal and immediately writes the four data stream numbers N, the fixed length, the head temperature, and the furnace number from the previous signal transmission point (DB block - 18# mill data block) into the DB block - finished steel data block. The stream numbers are then transmitted to the finished steel. The purchased cooling bed length measurement system then measures the length of the finished steel (measuring the tail length once for each steel bar) and sends the length data to the direct rolling PLC system (sending once for each steel bar).

[0044] Step 10: After the No. 18 rolling mill throws the steel for 5 seconds, ensure that the tail steel length measurement data has been updated. Then, the direct rolling PLC system saves the four data blocks in the DB block - finished steel data block: flow number N, fixed length, head temperature, furnace number, and measured tail steel length. At the same time, it displays them on the HMI screen for personnel to observe.

[0045] Step 11: The direct-rolling PLC system receives the tail steel length and calculates the billet weight to be adjusted (g) according to the formula: (tail steel length - set length) * standard weight per meter = adjustment weight.

[0046] Step 12: The direct rolling PLC system then transmits the two data points, the flow number N and the billet weight g to be adjusted, to the steelmaking continuous casting machine control system via TCP / IP network communication. The steelmaking continuous casting machine adjusts the billet shearing of the flow based on the received flow number N and billet weight g.

[0047] Example 3

[0048] Assuming the steelmaking continuous casting is an 8-strand continuous casting machine, capable of producing 8 strands of steel billets simultaneously, only one billet can be conveyed at a time when it is fed to the direct rolling mill due to rolling time. For this reason, 8 hot metal detection elements can be installed on the cooling bed of the steelmaking billet conveyor to detect the billet's flow number. Simultaneously, the time interval between two flow number signals must be much shorter than the rolling rhythm time. First, flow number detection occurs; for example, when a 3-strand continuous casting billet passes the cooling bed of the steelmaking billet conveyor, the hot metal detection element for the 3-strand billet detects a signal, indicating that the current billet flow number is 3. Simultaneously, the steelmaking control system transmits other billet information, such as length, head temperature, and furnace number, to the direct rolling mill PLC system. Next, the flow number transmission stage begins when the billet reaches… When the next signal detection point—the hot metal detection element at the entrance of the straight rolling mill—is reached, Flow No. 3 and other information have already been transmitted to that location; and so on, before the No. 1 rolling mill, the No. 3 rolling mill, the No. 8 rolling mill, the No. 18 rolling mill (last stand), and the No. 18 rolling mill's discarded tail steel, Flow No. 3 and other information are transmitted to the last tail steel of that billet; at the same time, the length measuring system measures the length of the tail steel, and the PLC system calculates the difference between the set length and the length of the tail steel measured by the length measuring system, converts it into weight, and then sends Flow No. 3 and the weight to be adjusted to the steelmaking continuous casting machine shearing system, and the steelmaking continuous casting machine adjusts the weight of the 3-strand steel billet that is being produced.

Claims

1. A method for transferring billet continuous casting serial numbers between direct rolling steelmaking and steel rolling, characterized in that, While recognizing the continuous casting billet flow number, the direct rolling PLC system communicates with the steelmaking PLC system via network transmission. The network transmission receives the billet parameter information corresponding to the continuous casting billet flow number. Subsequently, the direct rolling PLC system transmits the information sequentially according to the rolling direction of the billet, so that the billet in the rolling process corresponds one-to-one with the continuous casting billet flow number and billet parameter information. Finally, the continuous casting billet flow number and billet parameter information are transmitted to the finished steel product. The specific steps are as follows: Step 1: Selection of stream signal and establishment of data blocks; Step 2: Detect the sequence number and save it to the data block created in Step 1; Step 3: The billet continues to move, and the serial number begins to be transmitted; Step 4: Install a hot metal detection element at the entrance of the straight rolling mill. When the billet passes the hot metal detection element, save the signal stored at the previous signal transmission point to the data block at the entrance of the straight rolling mill, and transmit the signal to the entrance of the straight rolling mill. Step 5: Install hot metal detection elements at the roller table in front of No. 1 rolling mill. When the billet passes through the hot metal detection elements, save the billet information stored at the previous signal transmission point to the data block in front of No. 1 rolling mill, and transmit the stream number to the front of No. 1 rolling mill. Step 6: When the billet bites into the No. 1 rolling mill, rolling begins. When the billet bites into the No. 3 rolling mill, the current of the No. 3 rolling mill exceeds the threshold. After the direct rolling PLC system detects the biting current signal, it saves the billet information of the billet bitten into the No. 3 rolling mill to the No. 3 rolling mill data block, and transmits the flow number to the No. 3 rolling mill. The billet continues to be rolled. Step 7: When the billet bites into the No. 8 rolling mill, the current of the No. 8 rolling mill exceeds the threshold. After the direct rolling PLC system detects the biting current signal, it saves the billet information at the No. 8 rolling mill from the previous signal transmission point to the No. 8 rolling mill data block, and transmits the flow number to the No. 8 rolling mill. The billet continues to be rolled. Step 8: When the billet bites into the No. 18 rolling mill, the current of the No. 18 rolling mill exceeds the threshold. After the direct rolling PLC system detects the biting current signal, it saves the billet information of the billet biting into the No. 18 rolling mill from the previous signal transmission point to the No. 18 rolling mill data block, and transmits the flow number to the No. 18 rolling mill. The billet continues to be rolled. Step 9: After the billet is ejected from the No. 18 rolling mill, it becomes a finished steel product. The direct rolling PLC system detects the disappearance of the No. 18 current signal and transmits the billet information from the previous signal transmission point passed by the billet after being ejected from the No. 8 rolling mill to the finished steel product. At the same time, the length of the tail steel of the finished steel product is measured by the existing length measurement system. The tail steel length is measured once after each billet becomes a finished steel product, and the length data is sent to the direct rolling PLC system. Step 10: The direct rolling PLC system saves the information on the finished steel and the length of the tail steel, and displays it on the HMI screen for personnel to observe. Step 11: The direct rolling PLC system calculates the billet weight (g) that needs to be adjusted based on the received tail steel length. Step 12: The direct rolling PLC system transmits the detected flow number N and the billet weight g to be adjusted to the steelmaking continuous casting machine control system via TCP / IP network communication. The steelmaking continuous casting machine control system adjusts the billet shearing of flow number N according to the received flow number N and billet weight g. Step 1 specifically involves adding 8 DB data blocks to the direct rolling PLC system, named as follows: continuous casting billet detection data, direct rolling mill roller table entry data, hot metal detection element data before No. 1 mill, No. 3 mill data, No. 8 mill data, No. 18 mill data, and finished steel data; each DB block contains 4 data items in INT format, named as flow number, fixed length, head temperature, and furnace number.

2. The billet continuous casting sequence transfer method based on direct rolling steelmaking and rolling as described in claim 1, characterized in that, Step 2 specifically involves installing N hot metal detection elements at each position of the continuous casting billet on the steelmaking cooling bed, and connecting the signals to the existing direct rolling PLC system via lines.

3. The billet continuous casting sequence transfer method based on direct rolling steelmaking and rolling as described in claim 2, characterized in that, The specific working process of step 2 is as follows: when the N-flow steel billet conveyed from the steelmaking process passes through the Nth hot metal detection element, the direct rolling PLC system detects the signal. At the same time, the steelmaking continuous casting control system and the direct rolling PLC system communicate through the TCP / IP network to transmit the fixed length, head temperature and furnace number information corresponding to the N-flow steel billet to the direct rolling PLC system. Subsequently, the direct rolling PLC system writes the data stream number N corresponding to the N-flow billet, as well as the fixed length, head temperature, and furnace number into the four data blocks corresponding to the DB data block.

4. The billet continuous casting sequence transfer method based on direct rolling steelmaking and rolling as described in claim 1, characterized in that, Step 4 specifically involves installing a hot metal detector at the entrance of the straight rolling mill. When the billet passes the hot metal detection element, the straight rolling PLC system detects a signal and writes the billet signal from the previous signal detection point, namely the DB block-continuous casting billet detection data block, namely the four data stream numbers N, fixed length, head temperature, and furnace number, into the DB block-straight rolling mill entrance data block. The stream number is then transmitted to the entrance of the straight rolling mill.

5. The billet continuous casting sequence transfer method based on direct rolling steelmaking and rolling as described in claim 1, characterized in that, Step 11 specifically involves the direct rolling PLC system receiving the tail steel length and calculating it using the formula: (tail steel length - set length). Standard weight per meter = adjustment weight. Calculate the billet weight that needs to be adjusted (in grams).

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