Real-time tracking system for heating process of blank in steel rolling heating furnace

Abstract

The invention discloses a real-time tracking system for a heating process of a blank in a steel rolling heating furnace, which comprises thermal detection devices and thermocouples arranged at a first heating section, a second heating section and a uniform heating section of the heating furnace, and the thermal detection devices are arranged at a boundary of the first heating section and the second heating section and a boundary of the second heating section and the uniform heating section. According to the real-time tracking system for the heating process of the blank in the steel rolling heating furnace, the position of the blank in the operation process is corrected in real time, so that the operation track of the blank corresponds to the position of the burner, the burners are conveniently controlled to be opened in a targeted manner, and fixed-point temperature control is realized in the heating process of the blank; the accuracy of heating temperature control of blanks in the steel rolling heating furnace and the accuracy of blank position control can be improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of metal metallurgy, and particularly relates to a real-time tracking system for the heating process of billets in a rolling heating furnace. Background Art

[0002] In the existing walking beam heating furnace, the billet can be conveyed from the feeding end to the discharging end through the walking beam mechanism. The heating area of the furnace chamber is controlled in sections, and burners are arranged above and below each section to heat the billet. Detection components such as thermocouples are used to online detect the temperature of the furnace gas in this section, and the heating process of the billet is controlled by controlling the temperature of the furnace gas in each section. The walking beam mechanism calculates the stroke of the walking beam mechanism based on the displacement sensor installed on the furnace head translation oil cylinder. The billet distribution information model in the furnace calculates the approximate running position of the billet based on this information. When the billet reaches the furnace head and meets the discharging condition, after the furnace head discharging optical inspection detects the position of the billet head, the tapping operation is allowed.

[0003] In the actual operation process, due to the different residence times of the billets in the furnace, there is a large error between the furnace gas temperature and the actual steel temperature, which cannot reflect the actual heating temperature of the billet. As a result, although the furnace chamber temperature reaches the process requirements, due to reasons such as short residence time in the furnace and temperature difference between the upper and lower surfaces, the steel temperature cannot meet the rolling requirements. Moreover, the design of the walking beam heating furnace relies on the walking beam oil cylinder to run the billet to the discharging end, and cooperates with the discharging optical inspection at the discharging end to confirm whether the billet has run to the position where it can be tapped at the furnace head, but it cannot observe the accurate position of the billet in the furnace and perform full-range temperature control on the billet heating process. In addition, when the translation oil cylinder calculates the position of the billet in the furnace, gaps caused by factors such as oil cylinder loosening and bushing wear will all lead to inaccurate billet positions. The farther the billet runs, the greater the cumulative error.

[0004] It is desired to provide a real-time tracking system for the heating process of billets in a rolling heating furnace, especially regarding how to improve the accuracy of controlling the heating temperature of billets in the rolling heating furnace and the accuracy of controlling the billet position. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present invention provides a real-time tracking system for the heating process of billets in a rolling heating furnace, aiming to improve the accuracy of controlling the heating temperature of billets in the rolling heating furnace and the accuracy of controlling the billet position.

[0006] To achieve the above object, the technical solution adopted by the present invention is: a real-time tracking system for the heating process of billets in a rolling heating furnace, including a thermal detection device and thermocouples arranged in the first heating section, the second heating section, and the soaking section of the heating furnace. The thermal detection device is arranged at the boundary between the first heating section and the second heating section and at the boundary between the second heating section and the soaking section.

[0007] At the first heating section, the thermocouples are arranged on the furnace top and both sides of the furnace wall, and are used to detect the temperatures of the upper and lower furnace gases in the furnace chamber.

[0008] At the second heating section, the thermocouples are arranged on the furnace top and both sides of the furnace wall, and are used to detect the temperatures of the upper and lower furnace gases in the furnace chamber.

[0009] At the soaking section, the thermocouples are arranged on the furnace top and both sides of the furnace wall, and are used to detect the temperatures of the upper and lower furnace gases in the furnace chamber.

[0010] The distance between the demarcation line and the feed end of the heating furnace is a fixed value. When the billet reaches a demarcation line each time, when the head of the billet triggers the thermal detection device at this demarcation line, the billet displacement data is automatically corrected to the fixed value.

[0011] The first heating section, the second heating section and the soaking section are all provided with burners. The burners are connected to the gas supply pipeline and the air supply pipeline. A first valve with ON / OFF function is arranged in the gas supply pipeline of each burner, and a second valve with ON / OFF function is arranged in the air supply pipeline. The first valve and the second valve are connected to the control system, and the control system controls the opening and closing of the first valve and the second valve respectively; a third valve and a fourth valve are respectively arranged on each section of the branch pipe, and the third valve and the fourth valve are connected to the control system to control the gas and air consumption of each section, so as to control the rise and fall of the overall furnace temperature of each section.

[0012] A detection hole is arranged above the furnace chamber at the soaking section. A first infrared thermometer is arranged in the detection hole. The detection hole is perpendicular to the billet, and the first infrared thermometer detects the surface temperature of the billet.

[0013] A second infrared thermometer is arranged on the furnace wall at the soaking section. The second infrared thermometer is arranged corresponding to the number of rows of the billets placed, and the second infrared thermometer is used to measure the temperature of the lower surface of the billet.

[0014] A furnace head light inspection for discharging is arranged at the discharge end of the heating furnace.

[0015] The real-time tracking system for the heating process of the billet in the steel rolling heating furnace of the present invention ensures that the running track of the billet corresponds to the position of the burners by real-time correction of the position during the running process of the billet, which is convenient for targeted control of the opening of each burner, so that the heating process of the billet realizes fixed-point temperature control, and can improve the accuracy of the temperature control of the billet in the steel rolling heating furnace and the accuracy of the position control of the billet. Description of the Drawings

[0016] This specification includes the following drawings, and the shown contents are respectively:

[0017] Figure 1 It is a schematic structural diagram of the real-time tracking system for the heating process of the billet in the steel rolling heating furnace of the present invention;

[0018] In the figure, the markings are: 1, blank; 2, stepping mechanism; 3, thermocouple; 3', thermocouple; 3", thermocouple; 4, burner; 5, first infrared thermometer; 6, heat detection device; 6', heat detection device; 7, optical inspection for the furnace head to discharge. Specific embodiments

[0019] The following will, with reference to the accompanying drawings and through the description of embodiments, further elaborate in detail the specific embodiments of the present invention. The purpose is to help those skilled in the art have a more complete, accurate, and in-depth understanding of the concept and technical solution of the present invention and facilitate its implementation.

[0020] It should be noted that in the following embodiments, the "first", "second", and "third" do not represent an absolute distinction relationship in terms of structure and / or function, nor do they represent the execution order of sequence, but are merely for the convenience of description.

[0021] As Figure 1 shown, the present invention provides a real-time tracking system for the heating process of billets in a rolling heating furnace, including a heat detection device and thermocouples arranged in a first heating section, a second heating section, and a soaking section of the heating furnace. The heat detection device is arranged at the boundary between the first heating section and the second heating section and at the boundary between the second heating section and the soaking section.

[0022] Specifically, as Figure 1 shown, the billet is conveyed from the feeding end to the discharging end through a stepping mechanism. The heating area of the furnace chamber is controlled in sections. A first heating section, a second heating section, and a soaking section are arranged in the heating furnace. The first heating section, the second heating section, and the soaking section are located between the feeding end and the discharging end of the heating furnace. The first heating section, the second heating section, and the soaking section are arranged in sequence. The stepping mechanism conveys the billet through the first heating section, the second heating section, and the soaking section in sequence, and the heating temperatures of the first heating section, the second heating section, and the soaking section are set differently. The stepping mechanism includes a translation oil cylinder, and a displacement sensor is installed on the translation oil cylinder to calculate the stroke of the stepping mechanism. The displacement sensor is connected to the control system, and the error generated by the displacement sensor calculating the stroke of the translation oil cylinder during the running process of the billet can be corrected in real time.

[0023] As Figure 1 shown, at the first heating section, the thermocouple 3 is arranged on the furnace top and the two side furnace walls of the furnace wall. The thermocouple 3 is used to detect the upper and lower furnace gas temperatures in the furnace chamber. The stepping mechanism conveys the billet to move between the first side and the second side of the furnace chamber. The thermocouple 3 is arranged on both sides of the furnace top or both sides of the furnace wall. The thermocouples on both sides of the furnace top respectively detect the upper table furnace gas temperatures corresponding to the double-row billets, and the thermocouples on both sides of the furnace wall respectively detect the lower table furnace gas temperatures corresponding to the double-row billets.

[0024] As Figure 1As shown, at the second heating section, the thermocouples 3 are arranged on both sides of the furnace top or both sides of the furnace wall. The thermocouples on both sides of the furnace top respectively detect the furnace gas temperature corresponding to the upper surface of the double-row billets, and the thermocouples on both sides of the furnace wall respectively detect the furnace gas temperature corresponding to the lower surface of the double-row billets.

[0025] In the embodiment of the present invention, at the second heating section, it can be further divided into multiple sections according to the burner combination. Thermocouples 3' are arranged above and below the furnace chamber of each group of burner combinations to detect the furnace chamber temperature.

[0026] As Figure 1 shown, at the uniform heating section, the thermocouples 3 are arranged on both sides of the furnace top or both sides of the furnace wall. The thermocouples on both sides of the furnace top respectively detect the furnace gas temperature corresponding to the upper surface of the double-row billets, and the thermocouples on both sides of the furnace wall respectively detect the furnace gas temperature corresponding to the lower surface of the double-row billets.

[0027] After the billets enter the furnace chamber of the heating furnace, temperature control is carried out according to the heating process. The target value of the process temperature control is detected and fed back by the thermocouples. The thermocouples are connected to the control system and transmit the detection results to the control system.

[0028] As Figure 1 shown, a detection hole is arranged above the furnace chamber at the uniform heating section. A first infrared thermometer 5 is arranged in the detection hole. The detection hole is perpendicular to the billets. The first infrared thermometer 5 is located above the billets and is used to detect the temperature of the upper surface of the billets and the furnace chamber temperature. The first infrared thermometer 5 is arranged on the first side and the second side of the furnace chamber and at the positions between the first side and the second side. A second infrared thermometer is obliquely inserted and installed on the furnace wall at the uniform heating section. The second infrared thermometer is arranged corresponding to the number of rows of the billets placed. The second infrared thermometer is used to measure the temperature of the lower surface of the billets. The first infrared thermometer 5 and the second infrared thermometer are connected to the control system and transmit the detection results to the control system. The infrared thermometer calculates the object temperature by measuring the infrared energy, can overcome the interference of flames, combustible gas, dust, steam, etc., directly measure the surface temperature of the steel billets in the heating furnace, has the advantage of fast response time, and the infrared thermometer is a non-contact temperature measurement device with a service life of up to 8 - 10 years, is durable and basically requires no maintenance. By directly measuring the steel temperature with the infrared thermometer, it has obvious guiding significance for production control, and can be effectively used for improving the finished product quality, energy conservation, yield, shape control, research and development of special steel grades, etc.

[0029] In the embodiment of the present invention, by detecting the upper and lower surfaces of the billets and both sides of the furnace chamber in real time, the error between the actual steel billet temperature and the detection value of the thermocouple is accurately understood; the detection error of the thermocouple is corrected through temperature compensation to ensure uniform temperature control of the upper and lower surfaces and both sides of the billets during the soaking process, and the accuracy of the real-time temperature of the steel billets in the furnace can be fed back.

[0030] As Figure 1As shown, the first heating section, the second heating section and the uniform heating section are all provided with burners, which are connected to the gas supply pipeline and the air supply pipeline. The third valve (gas regulating valve) and the fourth valve (air regulating valve) are respectively provided on each branch pipe to control the gas and air consumption of each section, so as to control the rise and fall of the overall furnace temperature of each section; the first valve with ON / OFF function (open / close function) is provided in the gas supply pipeline of each burner, and the first valve is used to control the on / off and control of the gas supply pipeline of a single burner; the second valve with ON / OFF function is provided in the air supply pipeline of each burner, and the second valve is used to control the on / off and control of the air supply pipeline of a single burner. The first valve and the second valve are connected to the control system, and the control system controls the opening and closing of the first valve and the second valve respectively; the third valve and the fourth valve are connected to the control system, and the control system controls the opening and flow of the gas and air valves respectively. By controlling the opening and closing of the first valve and the second valve through the control system, the air and gas of the corresponding burner can be closed separately, which can control the local temperature and the oxidation of the billet by the oxygen entering the furnace; the third valve and the fourth valve adjust the valve position and opening to achieve the given gas or air flow and control the temperature drop.

[0031] The distance between the dividing line and the feeding end of the heating furnace is a fixed value. When the blank runs to a dividing line, the blank head triggers the thermal detection device at the dividing line, and the blank displacement data is automatically corrected to a fixed value. The thermal detection device is connected to the control system. After the thermal detection device is triggered, the thermal detection device transmits a signal to the control system. The control system learns the exact position of the blank at this time, stores the blank displacement data, and records the entire movement trajectory of the blank in the heating furnace. The control system controls the working state of the burner according to the signal transmitted by the thermal detection device. The control system controls the working state of the burner according to these real-time position information. This means that parameters such as the opening and closing of the burner and the flame intensity can be accurately adjusted according to the actual position of the blank. This targeted control method can not only ensure that the blank is heated evenly, but also greatly improve energy utilization efficiency and reduce production costs. Since the control system can know the position of the blank in real time, it can also predict the future position according to the moving speed and direction of the blank, and adjust the working state of the burner at each position in advance. This predictive control method further improves the accuracy and efficiency of the heating process.

[0032] like Figure 1 As shown, the dividing line between the first heating section and the second heating section is set as the first dividing line, the dividing line between the second heating section and the uniform heating section is set as the second dividing line, the distance between the first dividing line and the feed end of the heating furnace is a first fixed value, the distance between the second dividing line and the feed end of the heating furnace is a second fixed value, a first thermal detection device 6 is provided at the first dividing line, and a second thermal detection device 6' is provided at the second dividing line.

[0033] When the blank runs to the first demarcation line, the head of the blank triggers the first thermal detection device 6 at this first demarcation line. The first thermal detection device 6 transmits a signal to the control system. The control system acquires the blank displacement data at this time and automatically corrects the blank displacement data to a first fixed value, so that the position of the blank can be accurately known.

[0034] When the blank runs to the second demarcation line, the head of the blank triggers the second thermal detection device 6' at this second demarcation line. The second thermal detection device 6' transmits a signal to the control system. The control system acquires the blank displacement data at this time and automatically corrects the blank displacement data to a second fixed value, so that the position of the blank can be accurately known.

[0035] In the embodiment of the present invention, a thermal detection device is provided to detect and confirm the signal when the blank reaches the demarcation line. After the blank enters the furnace, the cloth model corrects the on-line misalignment of the simulated position information of the blank in the furnace operation position information caused by external factors based on the translation cylinder displacement data of the walking mechanism. When the blank runs to each demarcation line and the head of the blank triggers the thermal detection device at that place, the displacement data is automatically corrected to the fixed value of the detection device, so that the displacement sensor error in the calculation of the translation cylinder stroke can be corrected in real time during the blank operation, eliminating the error and improving the accuracy of the blank position positioning. The running track of the blank can be simulated. This track not only reflects the actual movement of the blank in the furnace, but also provides an important basis for the control system to control the burner. By correcting the position of the blank in real time during the running process, it is ensured that the running track of the blank corresponds to the position of the burner, which is convenient for targeted control of the opening of each burner, so that the temperature control at a fixed point can be realized in the heating process of the blank. This highly automated heating furnace control system not only improves the accuracy and efficiency of the heating process, but also reduces energy consumption and production costs. At the same time, because the system can respond and correct the change of the blank position in real time, it has high flexibility and adaptability and can cope with various complex production environments and conditions.

[0036] When the blank runs to a heating section and the temperature detected by the thermocouple is lower than the set threshold, a temperature increase operation is performed, and the control system controls the flame intensity of the burner in the first heating section to increase.

[0037] Two temperature measurement points are set on the upper surface of the hearth of the second heating section (the upper surface of the hearth refers to the part above the water beam in the hearth) and two temperature measurement points are set on the lower surface (the lower surface of the hearth refers to the part below the water beam in the hearth).

[0038] When the blank runs through the first demarcation line and enters the second heating section, if it is detected that the temperatures of two temperature measurement points set on the upper table or the lower table on one side of the furnace chamber in the second heating section reach the set threshold value, the temperature of one temperature measurement point on the upper table or the lower table on the other side of the furnace chamber does not reach the set threshold value, and the difference between the temperatures of the corresponding two temperature measurement points set is greater than the set deviation value, then stop supplying gas and air to the upper table or the lower table burner on the side of the furnace chamber with a higher temperature, and gradually close the first valve and the second valve connected to the burner for controlling the furnace temperature on the upper table or the lower table on the side of the furnace chamber with a higher temperature; until the difference between the temperatures of the corresponding two temperature measurement points on the upper table or the lower table of the furnace chamber reaches the allowable target value, then gradually open the first valve and the second valve connected to the burner for controlling the furnace temperature on the upper table or the lower table on the side of the furnace chamber with a higher temperature, so as to ensure that the blanks with the same residence time in the furnace during the furnace heating process are heated to the same temperature, and avoid the heating temperature difference of the blanks on both sides caused thereby (the switching of the corresponding burner can also be gradually alternated according to the actual situation).

[0039] After the blank runs through the second demarcation line and enters the uniform heating section, if it is detected that the temperatures of two temperature measurement points set on the upper table or the lower table of the furnace chamber are greater than the set deviation value, then stop supplying gas and air to the upper table or the lower table burner for controlling the furnace temperature on the side of the furnace chamber with a higher temperature. If the temperature of the upper table or the lower table on one side of the furnace chamber is higher than that of the upper table or the lower table on the other side, then stop supplying gas and air to the upper table or the lower table burner for controlling the furnace temperature on the side of the furnace chamber with a higher temperature, and gradually close the first valve and the second valve connected to the burner for controlling the furnace temperature on the upper table or the lower table on the side of the furnace chamber with a higher temperature; until the difference between the temperature of the upper table or the lower table on the side of the furnace chamber with a higher temperature and the temperature of the upper table or the lower table on the side of the furnace chamber with a lower temperature reaches the allowable target value, then gradually open the first valve and the second valve connected to the burner for controlling the furnace temperature on the upper table or the lower table on the side of the furnace chamber with a higher temperature, so as to ensure that the blanks with the same residence time in the furnace during the furnace heating process are heated to the same temperature, and avoid the heating temperature difference of the blanks on both sides caused thereby. The first infrared temperature measuring instrument 5 detects the temperatures of the upper and lower tables of the blank in the uniform heating section, and the operator can directly obtain the steel temperature data of the blank as a reference, and adjust the set threshold value of the furnace temperature in real time to ensure that the heating temperature of the blank meets the requirements of the rolling process.

[0040] As Figure 1 shown, a furnace head light inspection device 7 for discharging is arranged at the discharging end of the heating furnace. When the head of the blank runs to the furnace head light inspection device 7 for discharging, the furnace head light inspection device 7 for discharging transmits a signal to the control system to send a request for allowing steel tapping.

[0041] The present invention has been described exemplarily in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited by the above-mentioned manner. As long as various non-substantive improvements are made by adopting the method concept and technical solution of the present invention; or without improvement, the above-mentioned concept and technical solution of the present invention are directly applied to other occasions, they are all within the protection scope of the present invention.

Claims

1. Real-time tracking system for billet heating process in steel rolling heating furnace, characterized in that: It includes a heat detection device and thermocouples arranged in a heating section, a second heating section and an even heating section of the heating furnace. The heat detection device is arranged at the boundary between the first heating section and the second heating section and at the boundary between the second heating section and the even heating section.

2. The real-time tracking system for the heating process of billets in a steel rolling heating furnace according to claim 1 is characterized in that: In the first heating section, the thermocouples are arranged on both sides of the furnace top and both sides of the furnace side walls, and the thermocouples are used to detect the upper and lower furnace gas temperatures of the furnace.

3. The real-time tracking system for the heating process of billets in a steel rolling heating furnace according to claim 1 is characterized in that: In the second heating section, the thermocouples are arranged on both sides of the furnace top and both sides of the furnace side walls, and the thermocouples are used to detect the upper and lower furnace gas temperatures of the furnace.

4. The real-time tracking system for the heating process of billets in a steel rolling heating furnace according to any one of claims 1 to 3, characterized in that: In the uniform heating section, the thermocouples are arranged on both sides of the furnace top and both sides of the furnace side walls, and the thermocouples are used to detect the upper and lower furnace gas temperatures of the furnace.

5. The real-time tracking system for the heating process of billets in a steel rolling heating furnace according to any one of claims 1 to 3, characterized in that: The distance between the dividing line and the feeding end of the heating furnace is a fixed value. When the blank runs to a dividing line each time, the blank head triggers the thermal detection device at the dividing line, and the blank displacement data is automatically corrected to the fixed value.

6. The real-time tracking system for the heating process of billets in a steel rolling heating furnace according to any one of claims 1 to 3, characterized in that: The first heating section, the second heating section and the uniform heating section are all provided with burners, which are connected to the gas supply pipeline and the air supply pipeline. The gas supply pipeline of each burner is provided with a first valve with an ON / OFF function, and the air supply pipeline is provided with a second valve with an ON / OFF function. The first valve and the second valve are connected to a control system, and the control system controls the opening and closing of the first valve and the second valve respectively. The third valve and the fourth valve are respectively provided on each branch pipe, and the third valve and the fourth valve are connected to the control system to control the gas and air consumption of each section, so as to control the rise and fall of the overall furnace temperature of each section.

7. The real-time tracking system for the heating process of billets in a steel rolling heating furnace according to any one of claims 1 to 6, characterized in that: A detection hole is arranged above the furnace at the uniform heating section, a first infrared thermometer is arranged in the detection hole, and the detection hole is perpendicular to the blank.

8. The real-time tracking system for the heating process of billets in a steel rolling heating furnace according to claim 7 is characterized in that: A second infrared thermometer is arranged on the furnace wall at the uniform heating section. The second infrared thermometer is arranged corresponding to the number of rows of the blanks. The second infrared thermometer is used to measure the temperature of the lower surface of the blanks.

9. The real-time tracking system for the heating process of billets in a steel rolling heating furnace according to any one of claims 1 to 6, characterized in that: A furnace head out-of-furnace optical inspection is arranged at the discharge end of the heating furnace.

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