A method of billet length measurement material tracking application

Abstract

The application discloses a kind of steel billet length measuring material tracking application methods, the actual length of steel billet is measured by laser range finder, then based on the preset multiple shear multiple length and cold shear cutting length, the non-negative integer multiple of each cutting length is calculated and determined, when steel billet passes each processing equipment, whether the length of rolling piece in each process meets process requirement is judged in real time, after steel billet leaves heating furnace, the difference between its actual length and theoretical length is calculated, and the length of tail steel after rolling is predicted accordingly, according to the prediction result, the multiple of multiple length and cutting length is adjusted, to reduce the gap between the actual length of tail steel and theoretical length, the method utilizes the high precision and stability of laser range finder, improves the accuracy of tail steel length control, effectively avoids the production interruption caused by inappropriate tail steel length, improves the automation level of production line, reduces labor intensity, improves product quality and production efficiency.

Description

Technical Field

[0001] This invention relates to the field of steel rolling technology, specifically to a method for tracking materials in billet length measurement. Background Technology

[0002] In the production process of a steel rolling mill, steel billets are used as raw materials. After being heated in a heating furnace, they are rolled into steel products that meet the standards.

[0003] The length of the multiple-length cut is an important parameter in the production process of a steel rolling mill. It determines the length of the tail material produced by the rolling mill. Precise control of the multiple-length cut can ensure the continuity and consistency of steel rolling, reduce scrap steel, and improve material utilization and production efficiency.

[0004] The error between the actual length of the billet and the standard length will directly affect the length of the rolled tail material, which in turn will affect the length of the tail steel. If the tail steel is too long or too short, it will lead to problems such as slowing down the production pace, production interruption, and increased scrap.

[0005] Therefore, accurate measurement of billet length and control of tail steel length are crucial for improving production efficiency, reducing waste, and ensuring product quality.

[0006] There are generally three methods for measuring the length of steel billets: manual sampling with a ruler, measurement with a billet position detector, and measurement with a ground roller encoder. Among these, manual sampling is labor-intensive and inefficient. The billet position detector cannot directly obtain the actual length of the billet. Using multiple billet position detectors can only determine whether the billet length exceeds the preset maximum or minimum allowable length. The billet drives the ground roller to rotate, and the encoder on the ground roller can indirectly measure the actual length of the billet. However, the measurement accuracy is unstable due to factors such as ground roller wear, billet surface slippage, and detection signal delay, making it difficult to provide stable and accurate measurement results for automated steel rolling production processes. Summary of the Invention

[0007] The purpose of this invention is to address the problems existing in the prior art by providing a method for measuring the length of steel billets and tracking materials.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0009] A method for measuring the length of steel billets and tracking materials includes the following steps:

[0010] The cross-sectional area of ​​the steel billet is measured as a, the multiple length of the steel billet is set as L, the shearing length is Li, and i is an integer from 1 to n, where n is the total number of specifications.

[0011] For each shear length Li, a non-negative integer multiple Ki is assigned, and Ki is calculated according to the formula L=Σ(Ki×Li);

[0012] The actual length of the steel billet is measured by laser rangefinders on both sides of the hoist or loading platform;

[0013] When the steel billet arrives at a processing device, it is determined whether the steel billet meets the length requirements of the processing device. If it does not meet the requirements, the processing device issues a length alarm.

[0014] After the billet leaves the heating furnace, the difference between the actual length and the theoretical length of the billet is calculated to obtain the length change value DL of the billet. The actual cross-sectional area of ​​the rolled product is measured as b. The estimated length DN of the tail steel after rolling is calculated as DN=(a×DL) / b.

[0015] Calculate the difference between DN and the theoretical length of the tail steel, and adjust Ki and L according to the difference to reduce the gap between the actual length and the theoretical length of the tail steel.

[0016] This invention uses a laser rangefinder to measure the actual length of a steel billet. Compared with traditional manual measurement using a ruler and measurement using a combination of rollers and encoders, the laser rangefinder has higher measurement accuracy and stability, and can reduce errors caused by human factors, equipment wear, and slippage on the surface of the steel billet, thereby measuring the length of the steel billet more accurately.

[0017] This invention can accurately predict the length of the tail steel after rolling by real-time monitoring and calculation of the actual length change of the billet, and flexibly adjust the multiple Ki of the length L and the shearing length Li according to the prediction results, so as to achieve precise control and adjustment of the tail steel, thereby reducing the gap between the actual length and the theoretical length of the tail steel. This not only improves the material utilization rate and reduces the production cost, but also avoids production interruption caused by the tail steel being too long or too short.

[0018] This invention reduces manual intervention and improves the automation level of the production line by automating measurement and data processing with a laser rangefinder. By setting a length alarm in front of each processing equipment, it can ensure that the length of the rolled parts in each process meets the process requirements, avoiding production interruptions or product quality problems caused by unsuitable length. This not only reduces labor intensity and improves production efficiency, but also reduces errors caused by human factors and improves product quality.

[0019] Preferably, the method for measuring the actual length of the steel billet is as follows: measuring the distance c of the laser rangefinder, the laser rangefinder measuring the distances d and e between itself and the steel billet, and the actual length of the steel billet f = cde.

[0020] The actual length of the steel billet can be accurately obtained through the precise measurement of the laser rangefinder. The use of laser ranging principle avoids complex physical contact and mechanical wear, thus improving the accuracy and stability of the measurement.

[0021] Preferably, when the steel billet is located on the elevator or the loading platform, the laser rangefinder is located on both sides of the steel billet, the laser rangefinder is at the same height as the steel billet, and the distance between the laser rangefinder and the steel billet is 2~3m.

[0022] Arranging the laser rangefinder on both sides of the steel billet at the same height ensures that the laser beam can be perpendicularly irradiated onto the surface of the steel billet, reducing measurement errors caused by angular deviation. At the same time, a spacing of 2-3m ensures that the laser rangefinder has good working performance and accuracy within the measurement range.

[0023] Preferably, the method for determining whether the billet has arrived at the elevator or the loading platform is as follows: if the value measured by the laser rangefinder is greater than 3m, it is determined that the billet has not arrived at the elevator or the loading platform; if the value measured by the laser rangefinder is not greater than 3m, it is determined that the billet has arrived at the elevator or the loading platform.

[0024] By setting a threshold, the laser rangefinder can accurately determine whether the billet has arrived at the elevator or the loading platform. This method is simple and effective, providing accurate signals for subsequent measurement and processing.

[0025] Preferably, if the value measured by the laser rangefinder on one side is greater than 3m, while the value measured by the laser rangefinder on the other side is less than 3m, it is determined that the steel billet located on the elevator or the loading platform is bent, and the laser rangefinder issues a bending alarm.

[0026] Only when the steel billet undergoes significant bending during transportation will the laser rangefinder on one side measure a value greater than 3m while the value on the other side is less than 3m. This timely bending alarm helps to avoid production interruptions and product quality problems caused by significant bending of the steel billet.

[0027] Preferably, a position detector is provided next to the conveyor rollers connecting each of the processing equipment. The position detector is located at the loading direction and unloading direction of each of the processing equipment, and the position of the steel billet is determined by the position detector.

[0028] The position detector is installed next to the conveyor rollers, which can monitor the position of the steel billet on the production line in real time. This helps to accurately track and position the steel billet and provides important information for subsequent processing.

[0029] Preferably, after the laser rangefinder measures the actual length of the steel billet, the actual length of the steel billet is input into the data processing module of the processing equipment to which the steel billet first arrives, according to the process sequence.

[0030] Inputting the actual length of the steel billet into the data processing module of the first processing equipment to arrive, according to the process sequence, helps each processing equipment to perform precise processing and adjustment based on the actual length, which helps to improve product quality and production efficiency.

[0031] Preferably, when the billet leaves any of the processing equipment, the actual length of the billet is input into the data processing module of the next processing equipment to which the billet will arrive, according to the process sequence.

[0032] When the billet leaves any of the processing equipment, its actual length is transmitted to the data processing module of the next processing equipment, ensuring information sharing and collaborative work among the various equipment on the production line, which helps to achieve the continuity and stability of the production process.

[0033] Preferably, when transporting the steel billet, the hoist or the loading platform keeps the steel billet on the hoist or the loading platform for a preset time, the preset time being longer than the stable sampling time of the laser rangefinder.

[0034] By allowing the steel billet to remain on the elevator or the loading platform for a preset time, the laser rangefinder has sufficient time to perform stable sampling and measurement. This helps improve the accuracy and reliability of the measurement and reduces production problems caused by measurement errors.

[0035] Preferably, the multiple length L is less than the length of the cooling bed, and the multiple length L is greater than 0.5 times the length of the cooling bed.

[0036] Setting the length L to be less than the length of the cooling bed but greater than 0.5 times the length of the cooling bed ensures that the billet will not be too long and block the cooling bed, thus interrupting normal production. On the other hand, it ensures that the cooling bed can be fully utilized, which helps to improve production efficiency.

[0037] Compared with the prior art, the beneficial effects of the present invention are:

[0038] (1) The present invention uses a laser rangefinder to measure the actual length of the billet. Compared with the traditional manual measurement by ruler and measurement by ground roller, the laser rangefinder has higher measurement accuracy and stability, and can reduce errors caused by human factors, equipment wear, and slippage of the billet surface, so as to measure the length of the billet more accurately.

[0039] (2) By real-time monitoring and calculation of the actual length change of the billet, the present invention can accurately predict the length of the tail steel after rolling, and adjust the multiple Ki of the multiple length L and the shearing length Li according to the prediction results. By changing the multiple length L, the gap between the actual length and the theoretical length of the tail steel is reduced, which not only improves the material utilization rate and reduces the production cost, but also avoids production interruption caused by the tail steel being too long or too short.

[0040] (3) This invention reduces manual intervention and improves the automation level of the production line by using the automated measurement and data processing of the laser rangefinder. Setting a length alarm in front of each processing equipment can ensure that the length of the rolled parts in each process meets the process requirements and avoid production interruption or product quality problems caused by unsuitable length. This can not only reduce labor intensity and improve production efficiency, but also reduce errors caused by human factors and improve product quality. Attached Figure Description

[0041] Figure 1 This is a flowchart illustrating the method for measuring the length of steel billets and tracking materials in an embodiment of the present invention.

[0042] Figure 2 This is a schematic diagram illustrating the principle of measuring the actual length of a steel billet in an embodiment of the present invention;

[0043] Figure 3 This is a schematic diagram of the sampling time and ranging value of the laser rangefinder in an embodiment of the present invention;

[0044] Figure 4 This is a schematic diagram of the process flow of a steel rolling mill in an embodiment of the present invention. Figure 1 ;

[0045] Figure 5 This is a schematic diagram of the process flow of the heating furnace in an embodiment of the present invention;

[0046] Figure 6 This is a schematic diagram of the process flow of a steel rolling mill in an embodiment of the present invention. Figure 2 ;

[0047] In the diagram: 1. Steel billet; 2. Loading platform; 3. Elevator; 4. Furnace entry roller; 5. Heating furnace; 6. Furnace entry cantilever roller; 7. Steel pusher; 8. Walking beam; 9. Furnace exit cantilever roller; 10. Furnace exit roller; 11. Main rolling mill; 12. Multiple length shear; 13. Position detector; 14. Laser rangefinder. Detailed Implementation

[0048] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] In the description of this invention, it should be noted that the terms "middle", "upper", "lower", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0050] like Figures 1-6 As shown, the specific solution of the embodiment is as follows: A method for measuring the length of steel billets and tracking materials is applied to the automated production process of a steel rolling mill. Some of the process sequences in the steel rolling mill are as follows:

[0051] (1) Use the loading platform 2 to send the truck transport billet onto the furnace roller 4, and use the elevator 3 to send the roller conveyor billet onto the furnace roller 4.

[0052] (2) The furnace roller 4 feeds each billet 1 into the heating furnace 5, so that the billet 1 moves to the furnace roller 6 of the heating furnace 5. The steel pusher 7 pushes the billet 1 into the walking beam 8 of the heating furnace 5. There are several billet positions in the heating furnace 5. The walking beam 8 drives several billets 1 to move and moves the billets 1 one by one to the furnace roller 9. The furnace roller 9 moves the billet 1 to the furnace roller 10 outside the heating furnace 5.

[0053] (3) The furnace roller 10 moves the billet 1 to the main rolling mill 11 for processing. The processed billet 1 is then sent to the long-length shear 12 for cutting.

[0054] This process involves at least five types of processing equipment: the furnace feed roller 4, the heating furnace 5, the furnace discharge roller 10, the main rolling mill 11, and the long-length shear 12.

[0055] Taking the rolling of Φ18 rebar from a 160mm square billet as an example, a method for billet length measurement and material tracking includes the following steps:

[0056] (1) A position detector 13 is provided next to the conveyor roller connecting each processing equipment. The position detector 13 adopts a laser position detector. At least five position detectors 13 are provided next to the furnace roller 4. Two position detectors 13 are needed to monitor whether the loading platform 2 sends the billet 1 onto the furnace roller 4. Two more position detectors 13 are needed to monitor whether the elevator 3 sends the billet 1 onto the furnace roller 4. Finally, one position detector 13 is needed to monitor whether the billet 1 arrives at the heating furnace 5.

[0057] The furnace exit roller 10 is equipped with at least two position detectors 13, which are used to determine whether the billet 1 has left the heating furnace 5 and whether the billet 1 has arrived at the main rolling mill 11. A position detector 13 is provided between the main rolling mill 11 and the long-length shear 12 to determine whether the billet 1 has left the main rolling mill 11 and entered the long-length shear 12.

[0058] (2) The cross-sectional area of ​​billet 1 is measured to be a, a = 160mm × 160mm. The length of billet 1 is set to L. There are two specifications for the cutting length: L1 and L2. L1 is 9m and L2 is 12m. The length of billet 1 is less than the length of the cooling bed and greater than 0.5 times the length of the cooling bed. In order to improve the fixed length rate and reduce scrap steel, the longest length of billet 1 should be selected when selecting the length of billet 1 to reduce the number of multiple cuts. According to the production plan, the theoretical length of the tail steel is 50m.

[0059] (3) Set non-negative integer multiples K1 and K2 for the cutting lengths L1 and L2 respectively. According to the formula L=L1×K1+L2×K2, K1 and K2 are calculated.

[0060] (4) The distance between the laser rangefinder 14 on both sides of the loading platform 2 or the hoist 3 and the billet 1 is 2~3m. The distance between the two laser rangefinders 14 is c. The laser rangefinder 14 and the billet 1 are at the same height. The loading platform 2 or the hoist 3 is used to send the billet 1 onto the furnace roller 4. The laser rangefinders 14 are located on both sides of the billet 1. When the hoist 3 or the loading platform 2 is transporting the billet 1, the laser rangefinder 14 cannot measure a stable value within time T1, so that the billet 1 stays on the hoist 3 or the loading platform 2 for a preset time T2. The preset time T2 is greater than the stable sampling time of the laser rangefinder 14.

[0061] (5) When the distance measured by the laser rangefinder 14 is greater than 3m, it is determined that the billet 1 has not reached the elevator 3 or the loading platform 2. When the distance measured by the laser rangefinder 14 is not greater than 3m, it is determined that the billet 1 has reached the elevator 3 or the loading platform 2. If the distance measured by the laser rangefinder 14 on one side is greater than 3m, while the distance measured by the laser rangefinder 14 on the other side is less than 3m, it is determined that the billet 1 on the elevator 3 or the loading platform 2 has bent, and the laser rangefinder 14 issues a bending alarm.

[0062] (6) When the billet 1 is located on the elevator 3 or the loading platform 2, the laser rangefinder 14 measures the distance between itself and the billet 1 as d and e respectively, and the actual length of the billet 1 is f=cde.

[0063] (7) Divide the processing equipment that the billet 1 passes through along the process route, such as the furnace roller 4, heating furnace 5, furnace roller 10, rolling mill, and long shear 12, into different material positions. Create a data block containing all material positions in the data processing module of each processing equipment. The data processing module can be a PLC controller. Each PLC controller is connected to the switch to communicate with each other, set the same network segment and different IP addresses, and establish a communication connection between a main PLC controller and the PLC controller of each processing equipment.

[0064] Each PLC controller establishes a data block for information exchange. Taking Siemens PLC controllers as an example, the data to be transmitted to the slave PLC is written into the write part of the data block in the master PLC, and the data to be transmitted to the master PLC is written into the read part of the data block in the slave PLC. Finally, the read and write communication program is written in the master PLC. Before that, a background data block for communication must be established, and then communication function blocks such as SFB14 are used to read data and SFB15 is used to write data.

[0065] After the laser rangefinder 14 measures the actual length of the billet 1, it inputs the actual length of the billet 1 into the data processing module of the processing equipment that the billet 1 arrives at first, according to the process sequence.

[0066] (8) Create a data block containing all material positions in the PLC controller of heating furnace 5 to store the length information of billet 1 at each position. When billet 1 moves between material positions, the length information of billet 1 is transmitted from one material position to the next material position according to the field detection signal. The transmission process in heating furnace 5 is as follows:

[0067] At billet position #1, after the step beam moves forward to its position, the data block copy function SFC20 is used to transfer the data of material positions #81 to #86 of the step beam forward by one billet position to billet position #2 to the furnace cantilever roller 9. Similarly, after the step beam moves backward to its position, the data of billet positions #81 to #86 of the step beam is transferred backward by one billet position.

[0068] When billet 1 arrives at each processing equipment, the data processing module of the processing equipment determines whether billet 1 meets the length requirements of the processing equipment. If it does not meet the requirements, the data processing module issues a length alarm. When billet 1 leaves any processing equipment, the actual length of billet 1 is input into the data processing module of the next processing equipment to which billet 1 will arrive, according to the process sequence.

[0069] Taking the transmission process from heating furnace 5 to multiple-length shear 12 as an example: when the position detector 13 on the discharge side of heating furnace 5 detects billet 1, it transmits the length data of billet 1 at the material position of the discharge cantilever roller 9 to the PLC controller of the discharge ground roller 10. When the position detector 13 in front of the main rolling mill 11 detects billet 1, it transmits the length data of billet 1 from the PLC controller of the discharge ground roller 10 to the PLC controller of the main rolling mill 11, until it is finally transmitted to the PLC controller of multiple-length shear 12.

[0070] (9) After the billet 1 leaves the heating furnace 5, calculate the difference between the actual length and the theoretical length of the billet 1. If the difference between the actual length and the theoretical length of the billet 1 is -10cm, it means that the length of the billet 1 is reduced by 10cm. Then the length change value of the billet 1 is DL=10cm. According to the past production data of Φ18 rebar, the negative difference rate of rebar can be calculated to be stable at 4.5%. Therefore, the actual cross-sectional area of ​​Φ18 rebar b=π×9×95.5%×9×95.5% can be calculated. Then calculate the estimated length DN of the tail steel after rolling, DN=(a×DL) / b, and calculate DN=24.83m.

[0071] (10) The difference between DN and the theoretical length of the tail steel is 25.17m. It is concluded that the tail steel is too short. At this time, the length L of the subsequent billet 1 is adjusted to reduce the length L of the subsequent billet 1 by 24~26m. Then, K1 and K2 are adjusted accordingly to increase the length of the tail steel, thereby narrowing the gap between the actual length and the theoretical length of the tail steel.

[0072] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for measuring the length of steel billets and tracking materials, applied in the automated production process of a steel rolling mill. Part of the process sequence in the steel rolling mill is as follows: a loading platform is used to feed truck-transported billets onto the furnace-entry rollers; a hoist is used to feed the billets onto the furnace-entry rollers via a roller conveyor; the furnace-entry rollers feed each steel billet into the heating furnace; the exiting cantilever rollers move the steel billets to the exiting rollers outside the heating furnace; the exiting rollers move the steel billets to the main rolling mill for processing; the processed steel billets are then fed into a long-length shear for cutting; characterized in that… The method includes the following steps: The cross-sectional area of ​​the steel billet is measured as a, the multiple length of the steel billet is set as L, the shearing length is Li, and i is an integer from 1 to n, where n is the total number of specifications. For each shear length Li, a non-negative integer multiple Ki is assigned, and Ki is calculated according to the formula L=Σ(Ki×Li); The actual length of the steel billet is measured by laser rangefinders on both sides of the hoist or loading platform; When the steel billet arrives at a processing device, it is determined whether the steel billet meets the length requirements of the processing device. If it does not meet the requirements, the processing device issues a length alarm. After the billet leaves the heating furnace, the difference between the actual length and the theoretical length of the billet is calculated to obtain the length change value DL of the billet. The actual cross-sectional area of ​​the rolled product is measured as b. The estimated length DN of the tail steel after rolling is calculated as DN=(a×DL) / b. Calculate the difference between DN and the theoretical length of the tail steel, and adjust Ki and L according to the difference to reduce the gap between the actual length and the theoretical length of the tail steel; When the steel billet is located on the elevator or the loading platform, the laser rangefinder is located on both sides of the steel billet, the laser rangefinder is at the same height as the steel billet, and the distance between the laser rangefinder and the steel billet is 2~3m; The method for determining whether the billet has reached the elevator or the loading platform is as follows: if the value measured by the laser rangefinder is greater than 3m, it is determined that the billet has not reached the elevator or the loading platform; if the value measured by the laser rangefinder is not greater than 3m, it is determined that the billet has reached the elevator or the loading platform. If the value measured by the laser rangefinder on one side is greater than 3m, while the value measured by the laser rangefinder on the other side is less than 3m, it is determined that the billet on the elevator or the loading platform has bent, and the laser rangefinder issues a bending alarm.

2. The method for measuring the length of steel billets and tracking materials according to claim 1, characterized in that, The method for measuring the actual length of the steel billet is as follows: measure the distance c of the laser rangefinder, and the distances d and e between the laser rangefinder and the steel billet are measured by the laser rangefinder. The actual length of the steel billet is f=cde.

3. The method for measuring the length of steel billets and tracking materials according to claim 1, characterized in that, A position detector is installed next to the conveyor rollers connecting each of the processing equipment. The position detector is located at the loading direction and unloading direction of each of the processing equipment. The position detector is used to determine the position of the steel billet.

4. The method for measuring the length of steel billets and tracking materials according to claim 1, characterized in that, After the laser rangefinder measures the actual length of the steel billet, it inputs the actual length of the steel billet into the data processing module of the processing equipment to which the steel billet first arrives, according to the process sequence.

5. The method for measuring the length of steel billets and tracking materials according to claim 1, characterized in that, When the billet leaves any of the processing equipment, the actual length of the billet is input into the data processing module of the next processing equipment to which the billet will arrive, according to the process sequence.

6. The method for measuring the length of steel billets and tracking materials according to claim 1, characterized in that, When transporting the steel billet, the hoist or the loading platform keeps the steel billet on the hoist or the loading platform for a preset time, the preset time being longer than the stable sampling time of the laser rangefinder.

7. The method for measuring the length of steel billets and tracking materials according to claim 1, characterized in that, The length L of the measuring rod is less than the length of the cooling bed, and the length L of the measuring rod is greater than 0.5 times the length of the cooling bed.

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