An on-line cooling device and method for hot-rolled steel sections

Abstract

The application relates to an online cooling device and method for hot rolling of a section steel, and relates to the field of performance testing of hot-rolled section steel, which comprises a steel feeding module, the steel feeding module comprises a roller way, conveying rollers and a motor, the conveying rollers are rotationally connected to the roller way, the number of the conveying rollers is several and the conveying rollers are arranged along the length direction of the roller way, and the driving shaft of the motor is drivingly connected with the conveying rollers; a spraying module, the spraying module comprises a main water pipe and a plurality of spraying pipe groups, the main water pipe is arranged on one side of the steel feeding module, the number of the spraying pipe groups is several and the spraying pipe groups are arranged along the length direction of the main water pipe, one spraying pipe group is arranged between two adjacent conveying rollers and is located on the upper side of the conveying rollers, the spraying pipe group comprises a plurality of spraying pipes and a plurality of spray heads, the spraying pipes are communicated with the main water pipe, the spray heads are arranged on the side of the spraying pipes away from the main water pipe and are communicated with the spraying pipes, the application has a circulating spraying system, can timely take away the temperature on the section steel, and improves the cooling effect of the cooling device on the section steel.

Description

Technical Field

[0001] This application relates to the field of performance testing of hot-rolled steel sections, and in particular to an online cooling device and method for hot-rolled steel sections. Background Technology

[0002] Structural steel is the part of the train that directly contacts and rolls with the wheels. It mainly bears the weight of the train, provides guidance for travel, and distributes pressure. Subway tracks typically use heavy-duty structural steel, such as 60kg / m manganese steel, to withstand high loads and frequent use.

[0003] High-strength steel is prone to tempering and softening at high temperatures, reducing its strength and toughness. Therefore, it is essential to conduct experiments on the characteristics and patterns of high-temperature tempering behavior of structural steel to provide theoretical basis and technical support for predicting, preventing, and improving its safety during use. The experimental procedure is as follows: the structural steel is placed in air at room temperature and then subjected to high-temperature tempering treatment at different temperatures. Tensile tests are then performed on the tempered samples to measure their strength, toughness, ductility, and other performance parameters. Simultaneously, metallographic analysis is conducted on the test samples to observe their microstructure characteristics. The samples are then cooled and the condition is observed again.

[0004] The existing technology has the following problems. In the final cooling process, after the hot rolling of the steel section is completed and cooled, it is reheated and placed in a cold water tank or oil tank for heat treatment. However, although the cold water tank has a lot of cold water, it lacks circulation cooling, so the heat dissipation is slow and the cooling efficiency is low. There is still room for improvement. Summary of the Invention

[0005] To address the problem that although the cold water tank contains a large amount of cold water, it lacks circulating cooling, resulting in a slow rise in water temperature and slow heat dissipation in the continuous production water tank, leading to low cooling efficiency, this application provides an online cooling device and method for hot rolling of structural steel.

[0006] In a first aspect, this application provides an online cooling device for hot rolling of structural steel, which adopts the following technical solution: An online cooling device for hot rolling of structural steel includes: The steel feeding module is used to move the steel section. The steel feeding module includes a roller conveyor, a conveyor roller and a motor. The conveyor roller is rotatably connected to the roller conveyor. There are several conveyor rollers arranged along the length of the roller conveyor. The drive shaft of the motor is connected to the conveyor roller through a transmission. A spraying module is used to spray the steel sections on the steel feeding module. The spraying module includes a main water pipe and a spray pipe assembly. The main water pipe is located on one side of the steel feeding module. There are several spray pipe assemblies arranged along the length of the main water pipe. One set of spray pipe assemblies is located between two adjacent conveyor rollers and above the conveyor rollers. Each spray pipe assembly includes several spray pipes and several nozzles. The spray pipes are connected to the main water pipe. The nozzles are located on the side of the spray pipes away from the main water pipes and are connected to the spray pipes. The nozzles are oriented towards the steel sections on the steel feeding module.

[0007] By adopting the above technical solution, the steel profiles are sprayed with water at a constant, lower temperature, which continuously carries away the heat from the steel profiles, forming a circulating spray system and improving the cooling effect of the cooling device on the steel profiles.

[0008] Optionally, several of the nozzles in the same spray pipe assembly are arranged spirally with the steel section on the steel inlet module as the axis.

[0009] By adopting the above technical solution and spiral arrangement, the number of nozzles in the same spray pipe group is reduced while ensuring uniform spraying. This reduces equipment costs while maintaining spraying effect, saving a lot of money.

[0010] Optionally, the spray pipe is equipped with a manual throttle valve and a pneumatic ball valve.

[0011] By adopting the above technical solution, the water flow rate on the spray pipe can be controlled through the manual throttle valve and the pneumatic ball valve, thereby providing different flow rates for different cooling needs and improving the adaptability of the cooling device.

[0012] Optional, also includes: The water inlet module is used to supply water to the main water pipe. The water inlet module includes a self-priming pump and a secondary water pipe. The secondary water pipe is connected to the main water pipe. The self-priming pump is located on the secondary water pipe and is connected to the secondary water pipe. A check valve is provided on the secondary water pipe.

[0013] Secondly, this application provides an online cooling method for hot-rolled steel sections, employing the following technical solution: An online cooling method for hot-rolled steel profiles, applied to an online cooling device for hot-rolled steel profiles as described above, includes: Receive the expected temperature and specifications of the steel profile. The receiving steel section is ready to receive the signal; The current temperature of the steel section is acquired upon receiving a signal indicating that the steel section is ready to enter. Cooling operations are generated based on the current temperature of the steel section, the expected temperature of the steel section, and the specifications of the steel section. The cooling operations include the operation of rotating conveyor rollers, the operation of pumping water with a self-priming pump, and the operation of spraying water with nozzles. Control the cooling device to perform cooling operations.

[0014] By adopting the above technical solution, the steel profiles are sprayed with water at a consistently low temperature, which promptly removes the heat from the steel profiles, forming a circulating spray system. This improves the cooling effect of the cooling device on the steel profiles. Furthermore, different cooling schemes are adopted for different steel profiles, enhancing the intelligence of the cooling device in cooling the steel profiles.

[0015] Optional, also includes: The final steel section temperature is obtained after the cooling device performs the cooling operation; The actual cooling rate is calculated based on the current steel section temperature, the finished steel section temperature, and the expected steel section temperature. When the actual cooling rate is less than the preset critical cooling rate, a repeat cooling operation is generated based on the end temperature of the steel section, the expected temperature of the steel section, and the specifications of the steel section. The cooling device is controlled to perform repeated cooling operations and update the temperature of the finished steel section and the actual cooling rate until the actual cooling rate is greater than the critical required cooling rate. When the actual cooling rate exceeds the critical required cooling rate, the cooling operation is updated based on the cooling operation and repeated cooling operation.

[0016] By adopting the above technical solution, when the cooling operation is not satisfactory, it indicates that the cooling operation is not optimal. Therefore, the subsequent remedial operation should also be included in the cooling operation. Thus, the cooling operation needs to be updated to establish a correct mapping relationship between the cooling operation and different cooling needs, thereby improving the accuracy of the cooling operation.

[0017] Optionally, methods for updating cooling operations based on cooling operations and repeated cooling operations include: Disassembly was performed based on the cooling operation to obtain the conveyor roller speed, spraying speed, and spraying duration; Disassembly was performed based on repeated cooling operations to obtain the repeated conveyor roller speed, repeated spraying speed, and repeated spraying duration; The conveyor roller speed is updated based on the conveyor roller speed, the repeat conveyor roller speed, the spray speed, the repeat spray speed, the spray duration, and the repeat spray duration.

[0018] Optionally, a method for verifying spray duration is also included, which includes: Obtain the current cooling operation point, the current section temperature of the steel profile, and the temperature sensor number of the current section temperature. The adjacent temperature sensor numbers are determined based on the current cooling operation point and the temperature sensor number, and the acquisition time is determined based on the conveyor roller speed and the preset segment length. After the acquisition time has elapsed, the temperature of the adjacent steel section corresponding to the adjacent temperature detection sensor number is acquired. The spray temperature difference is calculated based on the temperature of adjacent steel sections and the current steel section temperature; When the spray temperature difference falls within the preset natural cooling range, the spray duration is updated based on the acquisition time, and a preset spray pipe group damage signal is output. The spray duration is directly output when the spray temperature difference does not fall within the natural cooling range.

[0019] By adopting the above technical solution, when a certain spray pipe group is damaged, it means that the steel section was not sprayed by the area when passing through the corresponding position of the spray pipe group. The actual spraying time should be appropriately reduced according to the spraying time at that position, thus improving the accuracy of spraying time statistics.

[0020] Optionally, it also includes a method for controlling the cooling device to perform a cooling operation before maintenance after outputting a signal indicating damage to the spray pipe assembly, the method comprising: Based on the analysis of cooling operation, the cooling spray pipe group number is used to form the current cooling spray number group; The cooling spray tube group number that outputs the damage signal for the spray tube group is defined as the abnormal tube group number. The current cooling spray number group is corrected based on the abnormal pipe group number to obtain a replacement cooling spray number group. The number of cooling spray pipe group numbers in the replacement cooling spray number group is the same as the number of cooling spray pipe group numbers in the current cooling spray number group and does not include abnormal pipe group numbers. When a replacement cooling spray number group exists, the cooling operation is updated based on the replacement cooling spray number group to obtain the replacement cooling operation; After outputting a signal indicating damage to the spray pipe assembly, the cooling device is controlled to perform a replacement cooling operation before maintenance.

[0021] By adopting the above technical solution, the spraying operation is performed by switching to the position of the undamaged spray pipe group, thereby avoiding interference from the damaged spray pipe group without affecting the entire cooling process, thus improving the cooling flexibility of the cooling device.

[0022] Optionally, another method is also included, which involves controlling the cooling device to perform cooling operations before maintenance after outputting a signal indicating damage to the spray pipe assembly, the method comprising: The location of the anomaly was determined based on the temperature sensor number. Determine the maximum spray length based on abnormal locations; The specifications of the segmented steel sections are determined based on the maximum spray length and the steel section specifications. The segmented cooling operation is generated based on the current temperature of the steel section, the expected temperature of the steel section, and the specifications of the segmented steel section. Control the cooling device to perform segmented cooling operations.

[0023] By adopting the above technical solution, the steel profile is divided into several sections for cooling, thereby avoiding interference from damaged spray pipe groups without affecting the overall cooling process, thus improving the cooling flexibility of the cooling device.

[0024] In summary, this application includes at least the following beneficial technical effects: 1. By spraying the steel profiles with water at a constant, relatively low temperature, the water continuously carries away the heat from the steel profiles, forming a circulating spray system that improves the cooling effect of the cooling device on the steel profiles. 2. By avoiding interference from damaged spray pipe assemblies without affecting the overall cooling process, the cooling flexibility of the cooling device is improved. Attached Figure Description

[0025] Figure 1 This is a flowchart of an online cooling method for hot rolling of structural steel according to an embodiment of this application.

[0026] Figure 2 This is a schematic diagram of the structure of an online cooling device for hot rolling of steel profiles, as described in an embodiment of this application.

[0027] Figure 3 yes Figure 2 A sectional view along line AA in the diagram.

[0028] Figure 4 yes Figure 2 A sectional view along the BB direction.

[0029] Figure 5 This is a flowchart of a method for updating the cooling operation based on the cooling operation and repeated cooling operation in an embodiment of this application.

[0030] Figure 6 This is a flowchart of the method for verifying the spraying duration in the embodiments of this application.

[0031] Figure 7 This is a flowchart of a method for controlling a cooling device to perform a cooling operation before maintenance after receiving a signal indicating damage to the output spray pipe assembly, as described in this application embodiment.

[0032] Figure 8 This is a flowchart of another method for controlling the cooling device to perform cooling operations before maintenance after receiving a signal indicating damage to the output spray pipe assembly, as described in this application embodiment.

[0033] Explanation of reference numerals in the attached diagram: 1. Steel feeding module; 11. Roller conveyor; 12. Conveyor roller; 13. Motor; 2. Spraying module; 21. Main water pipe; 22. Spray pipe assembly; 221. Spray pipe; 222. Spray head; 223. Manual throttle valve; 224. Pneumatic ball valve; 3. Water inlet module; 31. Self-priming pump; 32. Auxiliary water pipe; 33. Check valve. Detailed Implementation

[0034] To make the purpose, technical solution, and advantages of this application clearer, the following description is provided in conjunction with the appendix. Figures 1-8 The present application will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the application.

[0035] This application discloses an online cooling method for hot-rolling section steel. (Refer to...) Figure 1 An online cooling method for hot-rolled steel profiles includes: Step 100: Receive the input expected temperature and specifications of the steel profile.

[0036] like Figure 2 As shown, this online cooling method for hot-rolled steel profiles is mainly applied to an online cooling device during hot rolling. This device includes a steel inlet module 1, a spray module 2, and a water inlet module 3. The steel inlet module 1 is installed on the ground and is used to transport and cool the steel profiles after testing. The spray module 2 is installed on one side of the steel inlet module 1 and extends above it, used to spray water onto the steel profiles on the steel inlet module 1. The water inlet module 3 is installed on one side of the spray module 2 and communicates with it, used to supply water to the spray module 2.

[0037] Reference Figure 2 The steel feeding module 1 includes a roller conveyor 11, conveyor rollers 12, and a motor 13. The roller conveyor 11 is installed on the ground, and the conveyor rollers 12 are rotatably connected to the roller conveyor 11. There are several conveyor rollers 12 arranged along the length of the roller conveyor 11, so that the steel profiles in contact with the conveyor rollers 12 can move along the length of the roller conveyor 11. The drive shaft of the motor 13 is connected to the conveyor rollers 12. Here, one motor 13 can drive one conveyor roller 12 to rotate, or one motor 13 can drive several adjacent conveyor rollers 12 to rotate. Taking one motor 13 driving several adjacent conveyor rollers 12 as an example, one motor 13 transmits rotation to one conveyor roller 12 through a belt. This conveyor roller 12 acts as the driving roller, while the other several adjacent conveyor rollers 12 are mutually driven by belts, so that one motor 13 drives several adjacent conveyor rollers 12 to rotate.

[0038] Reference Figure 2 and Figure 3The spray module 2 includes a main water pipe 21 and a spray pipe assembly 22. The main water pipe 21 is installed on one side of the steel feeding module 1, for example, it is installed on one side of the roller conveyor 11 and parallel to the roller conveyor 11, to serve as the main transmission channel for cooling water. There are several spray pipe assemblies 22 arranged along the length of the main water pipe 21. One set of spray pipe assemblies 22 is located between two adjacent conveyor rollers 12 and above the conveyor rollers 12 to spray local areas of the steel profile.

[0039] The spray pipe assembly 22 includes several spray pipes 221 and several nozzles 222. The spray pipes 221 are connected to the main water pipe 21, and the nozzles 222 are located on the side of the spray pipes 221 away from the main water pipe 21 and are interconnected with the spray pipes 221. The nozzles 222 are positioned towards the steel profiles on the steel inlet module 1 to spray the steel profiles. Here, the several nozzles 222 of the same spray pipe assembly 22 are arranged spirally around the steel profiles on the steel inlet module 1 to cover all exposed surfaces of the steel profiles.

[0040] Reference Figure 3 The spray pipe 221 is equipped with a manual throttle valve 223 and a pneumatic ball valve 224 to facilitate manual and automatic adjustment.

[0041] Reference Figure 2 and Figure 4 The water inlet module 3 includes a self-priming pump 31 and a secondary water pipe 32. The secondary water pipe 32 is connected to the main water pipe 21. The self-priming pump 31 is installed on and connected to the secondary water pipe 32 to pump external water into the secondary water pipe 32 and then supply it to the main water pipe 21. A check valve 33 is installed on the secondary water pipe 32 to prevent backflow of water.

[0042] The expected temperature of the steel section is the temperature at which the steel section needs to be cooled. This is a manually set temperature, which can be manually entered into the system. The steel section specifications are the specifications of the steel section that needs to be cooled after testing, including cross-sectional and length specifications. These can also be manually entered based on actual measurements.

[0043] Step 101: Receive the steel section's readiness signal.

[0044] The "Steel Section Ready to Enter" signal indicates that the steel section has completed testing and is ready to enter the steel feeding module 1 and move into the spray area. This signal can be obtained by manually pressing a signal button or switch button to start the entire equipment.

[0045] Step 102: Obtain the current temperature of the steel section when the signal indicating that the steel section is ready to enter is received.

[0046] The current temperature of the steel section is the temperature when it enters the steel feeding module 1. This temperature can be measured by the temperature sensor on the conveyor roller 12 when it enters the roller conveyor 11 or comes into contact with the first conveyor roller 12. When a signal indicating that the steel section is ready to enter is received, it means that the steel section is about to begin cooling. Therefore, the cooling temperature is the current temperature, and the cooling start time is the current start time.

[0047] Step 103: Generate a cooling operation based on the current section temperature, the expected section temperature, and the section specifications.

[0048] The cooling operation is required to cool the steel section on the steel infeed module 1 from its current temperature to its expected temperature. Here, the temperature from the moment the steel enters the steel infeed module 1 is the current temperature, and the temperature from the moment it leaves the module 1 is the expected temperature. The cooling operation includes the rotation of the conveyor rollers, the pumping of water by the self-priming pump, and the spraying of water by the nozzles. The conveyor roller rotation operation includes the direction, speed, and duration of rotation. The self-priming pumping operation includes the pumping speed and duration. The spraying operation includes the spraying speed and duration.

[0049] The corresponding cooling operation can be found here through a database search. The database stores the mapping relationship between the current steel section temperature, the expected steel section temperature, the steel section specifications, and the cooling operation. This mapping was compiled by professionals in the field based on extensive experimental records of different current steel section temperatures, specifications, and cooling operations, resulting in the expected final temperature of the steel section upon removal. When the system receives the corresponding current steel section temperature, expected steel section temperature, and steel section specifications, it automatically retrieves the corresponding cooling operation from the database and outputs it.

[0050] Alternatively, an equivalent empirical formula can be obtained through multiple experiments, and then the corresponding cooling operation can be calculated by substituting the corresponding size specifications.

[0051] Step 104: Control the cooling device to perform the cooling operation.

[0052] Step 105: Obtain the final steel temperature after the cooling operation is performed by the cooling device.

[0053] The final steel section temperature is the temperature of the steel section leaving the steel inlet module 1 after the cooling device has performed its cooling operation. The method of obtaining this temperature is the same as the current steel section temperature, i.e., it is obtained from the temperature sensor at the entry point of the steel inlet module 1.

[0054] Step 106: Calculate the actual cooling rate based on the current section temperature, the final section temperature, and the expected section temperature.

[0055] The actual cooling rate is the cooling efficiency after the cooling operation. It is calculated by first calculating the difference between the current and final temperatures of the steel profile, which is the actual temperature drop due to cooling; then calculating the difference between the current and expected temperatures of the steel profile, which is the theoretical temperature drop due to cooling; and finally dividing the actual temperature drop by the theoretical temperature drop to obtain the actual cooling rate.

[0056] Step 107: When the actual cooling rate is less than the preset critical cooling rate, generate a repeat cooling operation based on the end temperature of the steel section, the expected temperature of the steel section, and the specifications of the steel section.

[0057] The critical required cooling rate is the cooling rate that must be exceeded to be considered satisfactory. Repeated cooling operation refers to the cooling operation required to continue cooling the steel to its expected temperature after the initial cooling temperature has been reached. The generation of this cooling operation has already been described in previous step 103 and will not be repeated here.

[0058] If the actual cooling rate is less than the critical required cooling rate, it means that the cooling is not up to standard and cooling needs to continue. Therefore, the repeated cooling operation is performed.

[0059] Step 108: Control the cooling device to perform repeated cooling operations and update the temperature of the finished steel section and the actual cooling rate until the actual cooling rate is greater than the critical required cooling rate.

[0060] Step 109: When the actual cooling rate is greater than the critical required cooling rate, update the cooling operation based on the cooling operation and repeated cooling operation.

[0061] A value greater than the critical cooling rate indicates successful cooling. It's important to note that if a single cooling operation results in a value greater than the critical cooling rate, the cooling operation is correct and no update is needed. However, if repeated cooling operations are required to achieve a cooling rate greater than the critical requirement, then the cooling operation needs to be updated. In this case, the update should be based on the total number of operations performed.

[0062] The repeated cooling operation here can be performed multiple times. That is, if the actual cooling rate is still less than the critical required cooling rate when the cooling device performs repeated cooling operations, it is necessary to continue generating repeated cooling operations and then continue cooling. Therefore, the repeated cooling operation during the update is the sum of all generated repeated cooling operations.

[0063] Reference Figure 5 Methods for updating cooling operations based on cooling operations and repeated cooling operations include: Step 200: Disassemble based on the cooling operation to obtain the conveyor roller speed, spraying speed and spraying duration.

[0064] The conveying speed of conveyor roller 12 is the equivalent speed at which the steel section is advanced when it rotates during the cooling operation. The spraying speed is the spraying speed of spray pipe 221 during the cooling operation. The spraying duration is the duration of spraying by spray pipe 221 during the cooling operation. These parameters are included in the cooling operation description, so disassembly only requires their extraction.

[0065] Step 201: Disassemble based on the repeated cooling operation to obtain the conveying speed of the repeated conveying roller 12, the repeated spraying speed, and the repeated spraying duration.

[0066] The conveying speed of the repeating conveyor roller is the equivalent speed at which the conveyor roller 12 moves forward during the repeating cooling operation. The repeating spraying speed is the spraying speed of the spray pipe 221 during the repeating cooling operation. The repeating spraying duration is the duration of spraying by the spray pipe 221 during the repeating cooling operation. These parameters are included in the content of the repeating cooling operation, so only their extraction is required during disassembly.

[0067] Step 202: Update the conveyor roller speed based on the conveyor roller speed, the repeat conveyor roller speed, the spray speed, the repeat spray speed, the spray duration, and the repeat spray duration.

[0068] Different conveyor roller speeds, repeated conveyor roller speeds, spray speeds, repeated spray speeds, spray durations, and repeated spray durations will result in different cooling times for the corresponding steel sections. Therefore, the conveyor roller speed is updated by taking into account all the influencing factors. Here, all the contents can be converted into the spray time for the same steel section position, i.e., the position of the steel section per unit length.

[0069] Reference Figure 6 It also includes a method for verifying the spraying duration, which includes: Step 300: Obtain the current cooling operation point, the current section temperature of the steel profile, and the temperature detection sensor number of the current section temperature.

[0070] The current cooling operation point indicates the current stage of the cooling operation, including the current conveyor roller speed, conveyor roller direction, spray speed, and spray duration. The current section temperature of the steel profile refers to the temperature of a specific section of the steel profile at its current location. This temperature is obtained by temperature sensors arranged along the roller conveyor 11, with one sensor capturing the temperature of the steel profile. The temperature detection sensor number is the number of the sensor that detected the current section temperature. The method of acquisition is to receive the corresponding temperature and its corresponding number. The purpose of the number is to identify which temperature detection sensor is being used, and thus determine the location at which the temperature is being detected. It is important to note that the temperature detection sensors are located on both sides of a group of spray pipes 22 to monitor the effectiveness of the spray pipe group 22.

[0071] Step 301: Determine the adjacent temperature detection sensor number based on the current cooling operation point and the temperature detection sensor number, and determine the acquisition time based on the conveyor roller speed and the preset segment length.

[0072] The adjacent temperature sensor number is the number of the temperature sensor adjacent to the one with the current temperature sensor number. Here, the current conveying direction needs to be determined based on the current cooling operation point, thus determining the adjacent temperature sensor number. For example, if the temperature sensor numbers increase sequentially from top to bottom, then if the current conveying direction is downward, the adjacent temperature sensor number is the temperature sensor number plus one. The segment length is the length of the segment between each adjacent sensor number, that is, the length from the position corresponding to the temperature sensor number to the position corresponding to the adjacent sensor number. The acquisition time is the time it takes for a position on the same section of steel to cool from the position corresponding to the temperature sensor number to the position corresponding to the adjacent sensor number. It is calculated by dividing the segment length by the conveying speed of the conveyor roller.

[0073] Step 302: After the acquisition time has elapsed, acquire the temperature of the adjacent steel section corresponding to the adjacent temperature detection sensor number.

[0074] The temperature of adjacent steel sections is the temperature detected by the sensor corresponding to the adjacent temperature sensor number after the acquisition time. Here, after the acquisition time, the steel section that was originally at the position corresponding to the temperature sensor number has moved to the position corresponding to the adjacent sensor number.

[0075] Step 303: Calculate the spray temperature difference based on the temperature of the adjacent steel section and the current steel section temperature.

[0076] The spray temperature difference is the temperature difference between the steel sections before and after spraying. It is calculated by subtracting the temperature of the adjacent steel section from the current steel section temperature.

[0077] Step 304: When the spray temperature difference falls within the preset natural cooling range, update the spray duration based on the acquisition time and output a preset spray pipe group damage signal.

[0078] The natural cooling range refers to the range of temperature reduction caused by natural cooling. This range is derived from extensive testing and includes both the cooling temperature difference of the steel section at higher and lower temperatures. Since natural cooling differs from cold water cooling (which is far more effective), this range only uses the cooling temperature difference at higher temperatures as its boundary point. The spray pipe assembly damage signal indicates that the corresponding spray pipe assembly 22 is damaged. This signal can be output by flashing an indicator light. For example, an indicator light can be placed at the location of the corresponding spray pipe assembly 22 to display its status. A green light indicates that the corresponding spray pipe assembly 22 is working normally, while a red light indicates that the spray pipe assembly 22 is malfunctioning.

[0079] If this value is not found, it means that the spray cooling effect is not present here, the spray pipe assembly 22 is damaged, therefore there is no spray duration here, and the spray duration needs to be subtracted from the acquisition time.

[0080] Step 305: Directly output the spray duration when the spray temperature difference does not fall within the natural cooling range.

[0081] When the spray temperature difference does not fall within the natural cooling range, it indicates that the spraying effect exists, so the spraying duration can be directly output.

[0082] Reference Figure 7 It also includes a method for controlling the cooling device to perform cooling operations before maintenance after outputting a signal indicating damage to the spray pipe assembly, the method comprising: Step 400: Analyze the cooling spray pipe group number based on the cooling operation to form the current cooling spray number group.

[0083] The cooling spray pipe group number is the number of spray pipe group 22 that requires cooling operation and is part of the cooling operation. The purpose of this numbering is to identify which spray pipe group 22 it is. The current cooling spray number group is a set of cooling spray pipe group numbers.

[0084] Step 401: Define the cooling spray tube group number that outputs the spray tube group damage signal as the abnormal tube group number.

[0085] Step 402: Correct the current cooling spray number group based on the abnormal pipe group number to obtain a replacement cooling spray number group.

[0086] The replacement cooling spray number group is a number group of spray pipe groups 22 that can replace the current cooling spray number group. It is important to note that the number of cooling spray pipe group numbers in the replacement cooling spray number group is the same as the number of cooling spray pipe group numbers in the current cooling spray number group and does not include abnormal pipe group numbers. Therefore, the correction method here is to determine the starting or ending number of the adjacent spray pipe groups 22 based on the abnormal pipe group number, and then determine the number before and after based on the length of the current cooling spray number group. For example, if the current cooling spray number group has 8 units and the abnormal pipe group number is 10, then the replacement cooling spray number group is numbers 2-9 or 11-18. If the abnormal pipe group number is 5, then the replacement cooling spray number group is numbers 6-13.

[0087] Step 403: If a replacement cooling spray number group exists, update the cooling operation based on the replacement cooling spray number group to obtain the replacement cooling operation.

[0088] The replacement cooling operation is a cooling operation performed by the replacement cooling spray group. The update method here involves calculating the transmission time between the current cooling spray group and the replacement cooling spray group, and then delaying or advancing the transmission time for all operations. If the replacement cooling spray group exists, it means it can be found according to step 402, and then the replacement cooling operation can be performed.

[0089] Step 404: After outputting the signal that the spray pipe assembly is damaged, control the cooling device to perform a replacement cooling operation before maintenance.

[0090] Here, the control cooling device performs a replacement cooling operation, causing the replacement cooling spray group to work, thus achieving the working state of the current cooling spray group.

[0091] Reference Figure 8 It also includes another method for controlling the cooling device to perform cooling operations before maintenance after outputting a signal indicating damage to the spray pipe assembly, the method comprising: Step 500: Determine the location of the anomaly based on the temperature sensor number.

[0092] The abnormal location is the position of the temperature sensor number that outputs the fault signal for the sprinkler pipe assembly. This can be determined by searching a database; the database stores a mapping between temperature sensor numbers and abnormal locations. A person skilled in the art can assign a number to the temperature sensor and simultaneously determine the coordinates of that location. When the system receives the corresponding temperature sensor number, it automatically retrieves the corresponding abnormal location from the database and outputs it.

[0093] Step 501: Determine the maximum spray length based on the abnormal location.

[0094] The maximum spray length is the length of the largest steel specification that can be sprayed. This is determined by the length from the starting point of the steel section to the abnormal location. For example, if a temperature sensor is installed every 1 meter, and the temperature sensor is numbered 5, then the maximum spray length is 5 meters.

[0095] Step 502: Determine the segmented steel specifications based on the maximum spray length and steel profile specifications.

[0096] The segmented steel profile specifications refer to the specifications of each segment of steel profile after dividing it into sections according to the maximum spray length. The method for determining this is to subtract a certain number of maximum spray lengths from the steel profile specifications. For example, if the steel profile length is 20 meters and the maximum spray length is 5 meters, then the specifications for each segment are 5 meters, specifically: 0-5 meters, 5-10 meters, 10-15 meters, and 15-20 meters. If the steel profile length is 18 meters, then the last segment is 3 meters, meaning the specifications for each segment are: 0-5 meters, 5-10 meters, 10-15 meters, and 15-18 meters.

[0097] Step 503: Generate segmented cooling operation based on the current section temperature, the expected section temperature, and the section specifications.

[0098] The segmented cooling operation refers to the segmented cooling operation when the entire steel section is considered as a steel section composed of multiple segmented steel sections spliced ​​together. Here, the current temperature of the steel section each time is the starting temperature of each segment. The generation method was described in step 103 and will not be repeated here.

[0099] Step 504: Control the cooling device to perform segmented cooling operation.

[0100] It should be noted that although a segmented cooling operation is performed, the corresponding steel section is still a whole steel section and is not disassembled or sawn.

[0101] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Any feature disclosed in this specification (including the abstract and drawings) may be replaced by other equivalent or similar features unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is only one example of a series of equivalent or similar features.

Claims

1. A method for online cooling during hot rolling of structural steel, comprising an online cooling device for hot rolling of structural steel, characterized in that, The cooling device includes: The steel feeding module (1) is used to move the steel section. The steel feeding module (1) includes a roller conveyor (11), a conveyor roller (12) and a motor (13). The conveyor roller (12) is rotatably connected to the roller conveyor (11). There are several conveyor rollers (12) and they are arranged along the length of the roller conveyor (11). The drive shaft of the motor (13) is connected to the conveyor roller (12) through transmission. A spray module (2) is used to spray the steel sections on the steel feeding module (1). The spray module (2) includes a main water pipe (21) and a spray pipe group (22). The main water pipe (21) is located on one side of the steel feeding module (1). The number of spray pipe groups (22) is several and arranged along the length of the main water pipe (21). One group of spray pipe groups (22) is located between two adjacent conveyor rollers (12) and on the upper side of the conveyor rollers (12). The spray pipe group (22) includes several spray pipes (221) and several nozzles (222). The spray pipes (221) are connected to the main water pipe (21). The nozzles (222) are located on the side of the spray pipes (221) away from the main water pipes (21) and are connected to the spray pipes (221). The nozzles (222) are set towards the steel sections on the steel feeding module (1). The cooling method includes: Receive the expected temperature and specifications of the steel profile. The receiving steel section is ready to receive the signal; The current temperature of the steel section is acquired upon receiving a signal indicating that the steel section is ready to enter. Cooling operations are generated based on the current temperature of the steel section, the expected temperature of the steel section, and the specifications of the steel section. The cooling operations include the operation of rotating conveyor rollers, the operation of pumping water with a self-priming pump, and the operation of spraying water with nozzles. Control the cooling device to perform cooling operations; It also includes a method for verifying the spraying duration, which includes: Obtain the current cooling operation point, the current section temperature of the steel profile, and the temperature sensor number of the current section temperature. The adjacent temperature sensor numbers are determined based on the current cooling operation point and the temperature sensor number, and the acquisition time is determined based on the conveyor roller speed and the preset segment length. After the acquisition time has elapsed, the temperature of the adjacent steel section corresponding to the adjacent temperature detection sensor number is acquired. The spray temperature difference is calculated based on the temperature of adjacent steel sections and the current steel section temperature; When the spray temperature difference falls within the preset natural cooling range, the spray duration is updated based on the acquisition time, and a preset spray pipe group damage signal is output. The spray duration is directly output when the spray temperature difference does not fall within the natural cooling range.

2. The online cooling method for hot-rolled section steel according to claim 1, characterized in that, The nozzles (222) of the same spray pipe group (22) are arranged in a spiral with the steel section on the steel inlet module (1) as the axis.

3. The online cooling method for hot-rolled section steel according to claim 1, characterized in that, The spray pipe (221) is equipped with a manual throttle valve (223) and a pneumatic ball valve (224).

4. The online cooling method for hot-rolled section steel according to claim 1, characterized in that, Also includes: The water inlet module (3) is used to supply water to the main water pipe (21). The water inlet module (3) includes a self-priming pump (31) and a secondary water pipe (32). The secondary water pipe (32) is connected to the main water pipe (21). The self-priming pump (31) is located on the secondary water pipe (32) and is connected to the secondary water pipe (32). The secondary water pipe (32) is equipped with a check valve (33).

5. The online cooling method for hot-rolled section steel according to claim 1, characterized in that, Also includes: The final steel section temperature is obtained after the cooling device performs the cooling operation; The actual cooling rate is calculated based on the current steel section temperature, the finished steel section temperature, and the expected steel section temperature. When the actual cooling rate is less than the preset critical cooling rate, a repeat cooling operation is generated based on the end temperature of the steel section, the expected temperature of the steel section, and the specifications of the steel section. The cooling device is controlled to perform repeated cooling operations and update the temperature of the finished steel section and the actual cooling rate until the actual cooling rate is greater than the critical required cooling rate. When the actual cooling rate exceeds the critical required cooling rate, the cooling operation is updated based on the cooling operation and repeated cooling operation.

6. The online cooling method for hot-rolled section steel according to claim 5, characterized in that, Methods for updating cooling operations based on cooling operations and repeated cooling operations include: Disassembly was performed based on the cooling operation to obtain the conveyor roller speed, spraying speed, and spraying duration; Disassembly was performed based on repeated cooling operations to obtain the repeated conveyor roller speed, repeated spraying speed, and repeated spraying duration; The conveyor roller speed is updated based on the conveyor roller speed, the repeat conveyor roller speed, the spray speed, the repeat spray speed, the spray duration, and the repeat spray duration.

7. The online cooling method for hot-rolled section steel according to claim 1, characterized in that, It also includes a method for controlling the cooling device to perform a cooling operation before maintenance after outputting a signal indicating damage to the spray pipe assembly, the method comprising: Based on the analysis of cooling operation, the cooling spray pipe group number is used to form the current cooling spray number group; The cooling spray tube group number that outputs the damage signal for the spray tube group is defined as the abnormal tube group number. The current cooling spray number group is corrected based on the abnormal pipe group number to obtain a replacement cooling spray number group. The number of cooling spray pipe group numbers in the replacement cooling spray number group is the same as the number of cooling spray pipe group numbers in the current cooling spray number group and does not include abnormal pipe group numbers. When a replacement cooling spray number group exists, the cooling operation is updated based on the replacement cooling spray number group to obtain the replacement cooling operation; After outputting a signal indicating damage to the spray pipe assembly, the cooling device is controlled to perform a replacement cooling operation before maintenance.

8. The online cooling method for hot-rolled section steel according to claim 1, characterized in that, It also includes a method for controlling the cooling device to perform cooling operations before maintenance after outputting a signal indicating damage to the spray pipe assembly, the method comprising: The location of the anomaly was determined based on the temperature sensor number. Determine the maximum spray length based on abnormal locations; The specifications of the segmented steel sections are determined based on the maximum spray length and the steel section specifications. The segmented cooling operation is generated based on the current temperature of the steel section, the expected temperature of the steel section, and the specifications of the segmented steel section. Control the cooling device to perform segmented cooling operations.

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