Steel normalizing device and steel normalizing method

Abstract

A steel normalizing device and a steel normalizing method. The steel normalizing device comprises a heating chamber (1), a first heating apparatus (2), a second heating apparatus (3), a conveying apparatus (4), a control module (5), a first temperature monitoring member (6) and a second temperature monitoring member (7), wherein the heating chamber (1) comprises a first heating area (11) and a second heating area (12), which are in communication; the control module (5) is configured to control the operating state of the first heating apparatus (2), such that first temperature information is a normalizing temperature; the control module (5) is configured to control the operating state of the second heating apparatus (3), such that second temperature information is a normalizing isothermal temperature; and the control module (5) is configured to control the conveying apparatus (4) to drive steel to sequentially move to the first heating area (11) and the second heating area (12), and to make the steel stay in the first heating area (11) for a first preset duration and / or stay in the second heating area (12) for a second preset duration.

Description

Steel normalizing equipment and steel normalizing method

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on September 21, 2023, with application number 202311221809.2, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of steel heat treatment, for example, to a steel normalizing device and a steel normalizing method. Background Art

[0003] Normalizing carbon steel involves heating the steel to 30-50°C above the AC3 or Acm temperature line, holding the temperature for a specified period, and then air-cooling. Due to the slightly faster cooling rate, the structure contains a relatively high content of pearlite and its lamellar layers are finer, resulting in improved performance. For low-carbon steel, increasing hardness after normalizing can improve machinability and reduce surface roughness. For high-carbon steel, normalizing eliminates network cementite, preparing the steel for spheroidizing annealing and quenching.

[0004] There are two methods for steel normalizing in related technologies: conventional normalizing and isothermal normalizing. Ordinary normalizing is to heat the steel to the normalizing temperature and then quickly air cool it. The advantage is that the normalizing equipment only needs to set up a heating chamber to heat the steel to the normalizing temperature. The overall length of the normalizing equipment is short and the production efficiency is high. The disadvantage is that the steel after normalizing is very brittle; isothermal normalizing is to heat the steel to the normalizing temperature and then cool it to the normalizing isothermal temperature within 3 minutes, and then keep it warm for a preset time (the preset time is different for different materials). The advantage is that the hardness of the steel after normalizing is smaller, the metallographic structure is more uniform, and the toughness and plasticity are better than ordinary normalizing. The disadvantage is that the normalizing equipment usually includes independent heating chamber, cooling chamber and isothermal chamber. The heating chamber is set to heat the steel to the normalizing temperature, and the cooling chamber cools the steel to the normalizing isothermal temperature and then keeps it warm in the isothermal chamber. Therefore, the overall length of the normalizing equipment is long and the output is low. Moreover, due to the continuous feeding control method, for long workpieces, the heating and holding time of the two ends in the furnace are different, which will lead to inconsistent metallographic structures at both ends of the workpiece. The structures of the normalizing equipment in the related art are all based on the common normalizing method and only have one heating chamber.

[0005] Summary of the Invention

[0006] The present application provides a steel normalizing device and a steel normalizing method to solve the problem of how to enable the normalizing equipment in the related art to process steel with better performance.

[0007] According to one aspect of the present application, a steel normalizing device is provided, comprising a heating chamber, a first heating device, a second heating device, a conveying device, a control module, a first temperature monitoring component and a second temperature monitoring component, wherein the heating chamber comprises a first heating zone and a second heating zone in communication with each other;

[0008] The first temperature monitoring component is configured to monitor the temperature of the first heating zone and obtain first temperature information; the first heating device is configured to heat the first heating zone; and the control module is configured to obtain the first temperature information in real time and control the working state of the first heating device based on the first temperature information so that the first temperature information is a normalizing temperature.

[0009] The second temperature monitoring component is configured to monitor the temperature of the second heating zone and obtain second temperature information, the second heating device is configured to heat the second heating zone, and the control module is configured to obtain the second temperature information in real time and control the working state of the second heating device based on the second temperature information so that the second temperature information is the normalizing isothermal temperature;

[0010] The conveying device is arranged inside the heating chamber and is configured to convey steel. The control module is configured to control the conveying device to drive the steel to move to the first heating zone and the second heating zone in sequence, and make the steel stay in the first heating zone for a first preset time and / or stay in the second heating zone for a second preset time.

[0011] In some embodiments of the present application, the control module is configured to perform at least one of the following operations: adjusting a duty cycle of the first heating device based on the first temperature information so that the first temperature information is a normalizing temperature;

[0012] The duty cycle of the second heating device is adjusted based on the second temperature information so that the second temperature information is the normalizing isothermal temperature.

[0013] In some embodiments of the present application, the control module includes a temperature controller and a main controller, the first heating zone and the second heating zone each include a plurality of temperature control zones, each of the temperature control zones is provided with at least one temperature controller and at least one first temperature monitoring component, and the main controller is electrically connected to the temperature controller;

[0014] The temperature controller of the first heating zone is configured to obtain in real time the first temperature information monitored by the first temperature monitoring component of the temperature control zone and output the first temperature information to the main controller, and the main controller is configured to control the duty cycle of the first heating device of the corresponding temperature control zone based on the first temperature information, so that the first temperature information of the corresponding temperature control zone is the normalizing temperature;

[0015] The temperature controller of the second heating zone is configured to obtain in real time the second temperature information monitored by the second temperature monitoring device of the temperature control zone and output it to the main controller. The main controller is configured to control the duty cycle of the second heating device of the corresponding temperature control zone based on the second temperature information so that the second temperature information of the corresponding temperature control zone is the normalizing isothermal temperature.

[0016] In some embodiments of the present application, the control module also includes an over-temperature controller, which is electrically connected to the main controller. The over-temperature controller is configured to determine whether the first temperature information exceeds a first preset temperature and whether the second temperature information exceeds a second preset temperature. If the first temperature information exceeds the first preset temperature or the second temperature information exceeds the second preset temperature, an alarm message is sent to the main controller.

[0017] In some embodiments of the present application, the over-temperature controller is also configured to determine whether the difference between the first temperature information and the normalizing temperature exceeds a first preset difference and to determine whether the difference between the second temperature information and the normalizing isothermal temperature exceeds a second preset difference. If the difference between the first temperature information and the normalizing temperature exceeds the first preset difference or the difference between the second temperature information and the normalizing isothermal temperature exceeds the second preset difference, an alarm message is sent to the main controller.

[0018] In some embodiments of the present application, both the first heating device and the second heating device include a plurality of burners.

[0019] In some embodiments of the present application, the control module is configured to perform at least one of the following operations:

[0020] Controlling the plurality of burners located in the first heating zone to ignite in sequence based on a first preset timing;

[0021] The plurality of burners located in the second heating zone are ignited in sequence based on a second preset timing control.

[0022] In some embodiments of the present application, the burners included in the first heating device and the second heating device are divided into two groups, one group of burners is arranged above the conveying device, and the other group of burners is arranged below the conveying device;

[0023] There is an insulation zone between the first heating zone and the second heating zone, and the insulation zone is provided with insulation elements. There are two insulation elements, one of which is provided at the top of the insulation zone and the other is provided at the bottom of the insulation zone.

[0024] In some embodiments of the present application, the conveying device includes a conveying roller and a power member. There are multiple conveying rollers, and the power member is configured to drive the multiple conveying rollers to rotate to convey steel.

[0025] According to another aspect of the present application, a steel normalizing method is provided. The steel normalizing method is used in the steel normalizing equipment described in any embodiment of the present application, and the steel normalizing method comprises:

[0026] Controlling the conveying device to move the steel to a first heating zone, and allowing the steel to stay in the first heating zone for a first preset time to heat the steel in the first heating zone to a normalizing temperature greater than or equal to 800 degrees Celsius and less than or equal to 950 degrees Celsius;

[0027] The conveying device is controlled to drive the steel to move from the first heating zone to the second heating zone and stay in the second heating zone for a second preset time, so as to cool the steel to a normalizing isothermal temperature in the second heating zone and keep it at the normalizing isothermal temperature for the second preset time, the normalizing isothermal temperature is greater than or equal to 550 degrees Celsius and less than or equal to 650 degrees Celsius, and the second preset time is greater than or equal to 20 minutes and less than or equal to 40 minutes.

[0028] In some embodiments of the present application, the steel normalizing method further comprises:

[0029] Obtaining a feeding mode, wherein the feeding mode includes a step-by-step mode and a continuous mode;

[0030] In response to the feeding mode being a step-by-step mode, and the steel staying in the first heating zone for a first preset time or staying in the second heating zone for a second preset time, the power part is controlled to drive the conveying roller in the staying area to rotate a preset number of times in a preset pattern, and the preset number of turns is greater than or equal to 1 / 2 turn and less than or equal to 1 turn.

[0031] In some embodiments of the present application, after obtaining the feeding mode, the steel normalizing method further includes:

[0032] Get the feeding mode switching instruction;

[0033] In response to the feeding mode being the stepping mode, switching the feeding mode to the continuous mode based on the feeding mode switching instruction;

[0034] In response to the feeding mode being continuous, the feeding mode is switched to a stepwise mode based on the feeding mode switching instruction. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The following will introduce the drawings required for the description of the embodiments. The drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0036] FIG1 is a partial structural diagram of a steel normalizing equipment provided in Example 1 of the present application;

[0037] FIG2 is a circuit block diagram of a steel normalizing device provided in Example 1 of the present application;

[0038] FIG3 is a circuit block diagram of another steel normalizing equipment provided in Example 1 of the present application;

[0039] FIG4 is a timing diagram of the sequential ignition of multiple burners provided in Example 1 of the present application;

[0040] FIG5 is a flow chart of a steel normalizing method provided in Example 2 of the present application.

[0041] Among them: 1. Heating chamber; 11. First heating zone; 12. Second heating zone; 13. Thermal insulation; 14. Thermal insulation zone; 2. First heating device; 3. Second heating device; 4. Conveying device; 41. Conveying roller; 5. Control module; 51. Temperature controller; 52. Main controller; 53. Over-temperature controller; 6. First temperature monitoring device; 7. Second temperature monitoring device; 8. Burner; 9. Partition. DETAILED DESCRIPTION

[0042] The following describes the embodiments of the present application in conjunction with the accompanying drawings. The embodiments described are some related embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of this application.

[0043] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units listed, but may include other steps or units that are not listed or inherent to these processes, methods, products or devices.

[0044] Example 1

[0045] Figure 1 is a partial structural schematic diagram of a steel normalizing equipment provided in Example 1 of the present application, and Figure 2 is a circuit block diagram of a steel normalizing equipment provided in Example 1 of the present application. This embodiment is applicable to the case of normalizing steel pipes. As shown in Figures 1 and 2, the steel normalizing equipment includes a heating chamber 1, a first heating device 2, a second heating device 3, a conveying device 4, a control module 5, a first temperature monitoring component 6 and a second temperature monitoring component 7. The heating chamber 1 includes a first heating zone 11 and a second heating zone 12 that are connected.

[0046] The first temperature monitoring component 6 is configured to monitor the temperature of the first heating zone 11 and obtain first temperature information, the first heating device 2 is configured to heat the first heating zone 11, and the control module 5 is configured to obtain the first temperature information in real time, and control the working state of the first heating device 2 based on the first temperature information so that the first temperature information is the normalizing temperature.

[0047] In some embodiments, the first temperature monitoring component 6 refers to a component capable of monitoring temperature. For example, the first temperature monitoring component 6 is at least one of a temperature sensor and a thermocouple. The first temperature information is information reflecting the temperature value of the first heating zone 11 monitored by the first temperature monitoring component 6. The normalizing temperature is greater than or equal to 800 degrees Celsius and less than or equal to 950 degrees Celsius. In some embodiments, the normalizing temperature is greater than or equal to 850 degrees Celsius and less than or equal to 900 degrees Celsius. When the steel material is a steel pipe, by setting the normalizing temperature greater than or equal to 850 degrees Celsius and less than or equal to 900 degrees Celsius, the performance of the normalized steel pipe can be improved. The first heating device 2 refers to a device capable of heating the first heating zone 11. The operating state of the first heating device 2 refers to the state when the first heating device 2 is performing a specified function. For example, the operating state includes the first heating device 2 starting heating and stopping heating. In one embodiment, the first heating device 2 includes a burner 8, and the operating state includes burner 8 ignited and burner 8 not ignited. When the first heating device 2 starts heating, the temperature in the first heating zone 11 increases or remains constant. When the first heating device 2 stops heating, the temperature in the first heating zone 11 decreases. The control module 5 is a module capable of being programmed to execute instructions for operations such as logical operations, sequential control, timing, counting, and arithmetic operations. The control module 5 obtains the first temperature information and controls the operating state of the first heating device 2 based on the first temperature information. The control module 5 can adjust the operating state of the first heating device 2 in real time according to the current temperature value of the first heating zone 11, so that the first temperature information is the normalizing temperature and is maintained within a certain fluctuation range.

[0048] The second temperature monitoring component 7 is configured to monitor the temperature of the second heating zone 12 and obtain second temperature information, the second heating device 3 is configured to heat the second heating zone 12, and the control module 5 is configured to obtain the second temperature information in real time, and control the working state of the second heating device 3 based on the second temperature information so that the second temperature information is the normalizing isothermal temperature.

[0049] In some embodiments, the second temperature monitoring component 7 refers to a component capable of monitoring temperature, for example, the second temperature monitoring component 7 is at least one of a temperature sensor and a thermocouple. The second temperature information is information reflecting the temperature value of the second heating zone 12 monitored by the second temperature monitoring component 7. The normalizing isothermal temperature is greater than or equal to 550 degrees Celsius and less than or equal to 650 degrees Celsius. In some embodiments, the normalizing isothermal temperature is 600 degrees Celsius. When the steel material is a steel pipe, by setting the normalizing isothermal temperature to 600 degrees Celsius, the performance of the normalized steel pipe can be improved. The second heating device 3 refers to a device capable of heating the second heating zone 12, and the working state of the second heating device 3 refers to the state when the second heating device 3 is performing a specified function, for example, the working state includes the second heating device 3 starting heating and stopping heating. In one embodiment, the second heating device 3 includes a burner 8, and the working state includes the burner 8 being ignited and the burner 8 not being ignited. When the second heating device 3 starts heating, the temperature in the second heating zone 12 will increase. When the second heating device 3 stops heating, the temperature in the second heating zone 12 will drop. By obtaining the second temperature information and controlling the working state of the second heating device 3 based on the second temperature information, the working state of the second heating device 3 can be adjusted in real time according to the current temperature value of the second heating zone 12, so that the second temperature information is the normalizing isothermal temperature and is maintained within a certain fluctuation range.

[0050] The conveying device 4 is arranged inside the heating chamber 1 and is configured to convey steel. The control module 5 is configured to control the conveying device 4 to drive the steel to move to the first heating zone 11 and the second heating zone 12 in sequence, and to make the steel stay in the first heating zone 11 for a first preset time and in the second heating zone 12 for a second preset time.

[0051] In some embodiments, the conveying device 4 is a device for conveying steel. The first predetermined duration refers to the time the steel is in the first heating zone 11, which is no less than the time required to heat the steel from the initial temperature to the normalizing temperature. The second predetermined duration refers to the time the steel is in the second heating zone 12, which is the predetermined time at the normalizing isothermal temperature and is determined by the normalizing process being implemented.

[0052] In some embodiments, the conveying device 4 includes a conveying roller 41 and a power member. The number of conveying rollers 41 is multiple, and the power member is configured to drive the multiple conveying rollers 41 to rotate to convey the steel. The multiple conveying rollers 41 can be arranged at intervals. The power member refers to a device that can drive the conveying rollers 41 to rotate. In one embodiment, the power member can be a motor. When the steel is conveyed, it can be located above the conveying roller 41, so that when the conveying roller 41 rotates, it can drive the steel to move. Since the conveying device 4 is arranged inside the heating chamber 1, the first heating zone 11 and the second heating zone 12 are also located inside the heating chamber 1, so the conveying device 4 can drive the steel to move to the first heating zone 11 first, stay in the first heating zone 11 for a first preset time, be heated to the normalizing temperature, and then move to the second heating zone 12 and stay in the second heating zone 12 for a second preset time. Since the temperature of the second heating zone 12 is maintained at the normalizing isothermal temperature, when the steel moves from the first heating zone 11 to the second heating zone 12, it will be cooled from the normalizing temperature to the normalizing isothermal temperature in the second heating zone 12. The time the steel stays in the second heating zone 12 is the time the steel is kept at the normalizing isothermal temperature. In this embodiment, the second preset time is greater than the holding time of the conventional normalizing process and less than the holding time of the conventional isothermal normalizing process, forming a quasi-isothermal normalizing. In the above scheme, by setting the first heating zone 11 and the second heating zone 12 connected in the heating chamber 1, the control module 5 can obtain the first temperature information in real time, and control the working state of the first heating device 2 based on the first temperature information so that the first temperature information is the normalizing temperature. The control module 5 can also obtain the second temperature information in real time, and control the working state of the second heating device 3 based on the second temperature information so that the second temperature information is the normalizing isothermal temperature. During normalizing, the conveyor 4 can move the steel so that the steel moves sequentially to the first heating zone 11 and the second heating zone 12, and stays in the first heating zone 11 for a first preset time and / or in the second heating zone 12 for a second preset time. Therefore, the steel can be heated to the normalizing temperature in the first heating zone 11 for the first preset time, then cooled to the normalizing isothermal temperature in the second heating zone 12 within a short period of time, and then maintained at the normalizing isothermal temperature for the second preset time.

[0053] In the related art, the holding time of isothermal normalizing varies from 2 to 7 hours depending on the type of steel. The steel moves at a uniform speed in the furnace. If the motor speed of the conveying device 4 is too low, the steel will crawl on the conveying roller 41, affecting the accurate control of the time of leaving the furnace. Therefore, the motor usually maintains a low speed to avoid crawling. In order to keep the steel warm in the furnace for a predetermined time, there must be a furnace chamber that is long enough. Therefore, the furnace body of the normalizing equipment in the related art is very long. And too long of isothermal time will cause the carbon in the steel to escape, resulting in surface decarburization.

[0054] In this embodiment, in order to avoid decarburization on the surface of the steel, the preset holding time is shorter than the isothermal normalizing time in the related art, which is about 20-60 minutes, forming an effect similar to isothermal normalizing: First, for steel with carbon on the surface, shortening the isothermal holding time can prevent decarburization on the steel surface. For steel with zero carbon on the surface, the carburizing reaction during the isothermal process can cause the carbon inside the steel to diffuse to the steel surface, but it will not cause decarburization, which can achieve better carburizing effect and anti-decarburization effect; second, the motor of the conveying device 4 must maintain a certain speed. Shortening the isothermal holding time can also shorten the length of the furnace body. The length of the steel normalizing equipment in this embodiment is between the equipment lengths of isothermal normalizing and ordinary normalizing, which can reduce the equipment footprint and save factory costs; thirdly, shortening the isothermal holding time can make the output higher than isothermal normalizing and the cost lower. Even if the normalizing equipment in the related technology is used, steel with better performance can be processed, and the output is higher and the cost is lower; fourthly, the steel normalizing equipment of the present application can take into account ordinary normalizing, isothermal normalizing and the steel normalizing method of the present application. When producing different products, different normalizing effects can be achieved by simply adjusting the temperature and the feed speed of the steel, and it has strong compatibility.

[0055] In some embodiments of the present application, the control module 5 is configured to: adjust the duty cycle of the first heating device 2 based on the first temperature information so that the first temperature information is the normalizing temperature.

[0056] Among them, the duty cycle refers to the proportion of the power-on time relative to the total time in a pulse cycle. By adjusting the duty cycle of the first heating device 2, the ratio of the power-on time and the power-off time of the first heating device 2 will change. When the duty cycle increases, the temperature in the first heating zone 11 will rise due to the increase in the power-on time. When the duty cycle decreases, the temperature in the first heating zone 11 will decrease due to the decrease in the power-on time. By adjusting the duty cycle of the first heating device 2 based on the first temperature information, the temperature of the first heating zone 11 can be adjusted until the first temperature information is the normalizing temperature and maintained within a certain fluctuation range (the usual accuracy requirement is to fluctuate within ±5 degrees Celsius). For example, when the first temperature information is lower than the normalizing temperature, the duty cycle can be increased, and when the first temperature information is higher than the normalizing temperature, the duty cycle can be reduced, so that the first temperature information can be made the normalizing temperature.

[0057] In some embodiments of the present application, the control module 5 is configured to adjust the duty cycle of the second heating device 3 based on the second temperature information so that the second temperature information is the normalizing isothermal temperature.

[0058] Among them, the duty cycle refers to the proportion of the power-on time relative to the total time in a pulse cycle. By adjusting the duty cycle of the second heating device 3, the ratio of the power-on time and the power-off time of the second heating device 3 will change. When the duty cycle increases, the temperature in the first heating zone 11 will rise due to the increase in the power-on time. When the duty cycle decreases, the temperature in the first heating zone 11 will decrease due to the decrease in the power-on time. By adjusting the duty cycle of the second heating device 3 based on the second temperature information, the temperature of the second heating zone 12 can be adjusted until the second temperature information is the normalizing isothermal temperature and maintained within a certain fluctuation range (the usual accuracy requirement is to fluctuate within ±5 degrees Celsius). For example, when the second temperature information is lower than the normalizing isothermal temperature, the duty cycle can be increased, and when the second temperature information is higher than the normalizing isothermal temperature, the duty cycle can be reduced, so that the second temperature information can be made to be the normalizing isothermal temperature.

[0059] In some embodiments of the present application, as shown in Figures 1 and 3, the control module 5 includes a temperature controller 51 and a main controller 52, the first heating zone 11 and the second heating zone 12 each include multiple temperature control partitions, each temperature control partition is provided with at least one temperature controller 51 and at least one first temperature monitoring component 6, and the main controller 52 is electrically connected to the temperature controller 51.

[0060] The temperature controller 51 of the first heating zone 11 is configured to obtain in real time the first temperature information monitored by the first temperature monitoring component 6 of the temperature control zone in which it is located, and output it to the main controller 52. The main controller 52 is configured to control the duty cycle of the first heating device 2 of the corresponding temperature control zone based on the first temperature information so that the first temperature information of the corresponding temperature control zone is the normalizing temperature.

[0061] The temperature controller 51 of the second heating zone 12 is configured to obtain in real time the second temperature information monitored by the second temperature monitoring component 7 of the temperature control zone in which it is located, and output it to the main controller 52. The main controller 52 is configured to control the duty cycle of the second heating device 3 of the corresponding temperature control zone based on the second temperature information so that the second temperature information of the corresponding temperature control zone is the normalizing isothermal temperature.

[0062] In some embodiments, the temperature controller 51 refers to a controller for controlling the temperature. For example, the temperature controller 51 can be a microprocessor. The main controller 52 refers to the component that mainly performs logical control of the steel normalizing equipment. For example, the main controller 52 can be a programmable logic controller (PLC). The temperature controller 51 can communicate with the main controller 52 via the modbus communication protocol. The temperature controller 51 of each temperature control zone in the first heating zone 11 is connected to the first temperature monitoring component 6, and the temperature controller 51 of each temperature control zone in the second heating zone 12 is connected to the second temperature monitoring component 7, so that each temperature control zone can perform independent temperature control. When the duty cycles of the first heating device 2 and the second heating device 3 are different, the frequency and duration of the ignition of the first heating device 2 and the second heating device 3 are also different, thereby achieving temperature control. By setting multiple temperature control zones, when the temperature settings of two adjacent temperature control zones are different, relatively independent temperature control can also be achieved, reducing the mutual influence of the temperatures of the two temperature control zones, and better achieving the process requirements of heat treatment at different temperatures.

[0063] In one embodiment, the first heating zone 11 and the second heating zone 12 each have three temperature-controlled zones. A separator 9, which can be made of a heat-insulating material, is provided between adjacent temperature-controlled zones in the first heating zone 11. Separators 9 are also provided between adjacent temperature-controlled zones in the second heating zone 12. In this manner, the separators 9 can reduce the mutual influence of the temperatures of adjacent temperature-controlled zones, enabling better independent temperature control of each zone.

[0064] In some embodiments of the present application, the control module 5 further includes an over-temperature controller 53 electrically connected to the main controller 52. The over-temperature controller 53 is configured to determine whether the first temperature information exceeds a first preset temperature and whether the second temperature information exceeds a second preset temperature. If the first temperature information exceeds the first preset temperature or the second temperature information exceeds the second preset temperature, the over-temperature controller 53 issues an alarm to the main controller 52. The over-temperature controller 53 is a controller capable of performing logical operations. For example, the over-temperature controller 53 may be a microprocessor. The alarm indicates an over-temperature condition. When the first temperature information exceeds the first preset temperature or the second temperature information exceeds the second preset temperature, it indicates that at least one of the first heating zone 11 and the second heating zone 12 is overheated. Therefore, an alarm is issued to the main controller 52 so that the main controller 52 is promptly notified of the condition and ensures safe production. For example, the over-temperature controller 53 communicates with the main controller 52 via the Modbus communication protocol. Furthermore, upon receiving the alarm, the main controller 52 may control at least one of the first heating device 2 and the second heating device 3 to stop heating, thereby preventing the first heating zone 11 and the second heating zone 12 from overheating.

[0065] In some embodiments of the present application, the over-temperature controller 53 is further configured to determine whether the difference between the first temperature information and the normalizing temperature exceeds a first preset difference and determine whether the difference between the second temperature information and the normalizing isothermal temperature exceeds a second preset difference. If the difference between the first temperature information and the normalizing temperature exceeds the first preset difference or the difference between the second temperature information and the normalizing isothermal temperature exceeds the second preset difference, an alarm message is sent to the main controller 52. The fact that the difference between the first temperature information and the normalizing temperature exceeds the first preset difference or the difference between the second temperature information and the normalizing isothermal temperature exceeds the second preset difference indicates that the temperature difference between at least one of the first heating zone 11 and the second heating zone 12 is too high. Therefore, an alarm message is sent to the main controller 52 at this time so that the main controller 52 is aware of the situation in a timely manner for safe production.

[0066] In some embodiments of the present application, the first heating device 2 and the second heating device 3 each include a plurality of burners 8. Among them, the burner 8 is a general term for a device that causes fuel and air to be sprayed out in a certain manner for mixed combustion. Industrial burners are commonly known as burners, and there are many types and specifications, including fuel oil, gas (coal gas), and coal (coal powder / water-coal slurry). They have a wide range of applications, and burners are required in industrial situations where fuel needs to be burned to heat materials or reactions. By making the first heating device 2 and the second heating device 3 both include a plurality of burners 8, the burner 8 located in the first heating zone 11 can conveniently heat the first heating zone 11, and the burner 8 located in the second heating zone 12 can conveniently heat the second heating zone 12.

[0067] In some embodiments, when both the first heating device 2 and the second heating device 3 include multiple burners 8, the control module 5 is configured to adjust the duty cycle of the burners 8 in the first heating zone 11 based on the first temperature information so that the first temperature information is the normalizing temperature. The control module 5 is further configured to adjust the duty cycle of the burners 8 in the second heating zone 12 based on the second temperature information so that the second temperature information is the normalizing isothermal temperature. Different duty cycles of the burners 8 result in different ignition frequencies and durations of the burners 8, thereby enabling temperature control.

[0068] In some embodiments, the steel normalizing equipment further comprises a radiation tube, and the burner 8 is disposed in the radiation tube to heat the steel by radiation without an open flame.

[0069] In some embodiments of the present application, the control module 5 is configured to control the ignition of multiple burners 8 located in the first heating zone 11 in sequence based on a first preset timing. The first preset timing refers to the timing according to which the ignition of multiple burners 8 in the first heating zone 11 is performed. If the multiple burners 8 in the first heating zone 11 are ignited or extinguished at the same time when adjusting the temperature, it may cause unstable temperature and large fluctuations. If only some burners 8 are kept on and some burners 8 are kept off when adjusting the temperature, it may cause large temperature differences in different areas. By controlling the ignition of multiple burners 8 in the first heating zone 11 in sequence based on the first preset timing, it is possible to ensure temperature uniformity, achieve temperature stability, small temperature fluctuations, and small temperature differences between different positions in the same area.

[0070] In one embodiment, the multiple burners 8 in the first heating zone 11 are arranged in a certain order, for example, they are arranged by the distance between each burner 8 and the second heating zone 12. The first preset timing is that each burner 8 controls the next burner 8 to ignite after the ignition time reaches the preset time, and the next burner 8 controls the next burner 8 to ignite after the ignition time reaches the preset time, and so on, until all burners 8 are ignited in sequence, and the cycle is repeated. At the same time, the burner 8 is extinguished after the ignition time reaches the conduction time. The conduction time is the power-on time of the burner 8 in the set duty cycle of the burner 8, that is, each burner 8 will ignite the power-on time within a pulse cycle and be extinguished for the rest of the time. The preset time is proportional to the conduction time. For example, the preset time in Figure 4 can be 1 / 2 of the conduction time. Depending on the needs, the preset time can also be 1 / 4 of the conduction time. As shown in Figure 4, the horizontal axis represents time, and the vertical axis represents the first preset timing for igniting multiple burners 8. It can be seen that within a pulse cycle, a burner 8 will ignite for six time units. After each burner 8 has ignited for three time units, the next burner 8 will begin igniting, and so on, until all burners 8 have been ignited in sequence, and then the first burner 8 will be reignited. In this way, because different burners 8 are located in different positions, temperature uniformity can be ensured, achieving temperature stability, minimal temperature fluctuations, and smaller temperature differences between different positions in the same area.

[0071] In some embodiments of the present application, as shown in FIG. 1 and FIG. 3 , the control module 5 is configured to control the plurality of burners 8 located in the second heating zone 12 to ignite sequentially based on a second preset timing.

[0072] Among them, the second preset timing refers to the timing based on which the multiple burners 8 in the second heating zone 12 are ignited. If the multiple burners 8 in the second heating zone 12 are ignited or extinguished at the same time when adjusting the temperature, it may cause unstable temperature and large fluctuations. If only some burners 8 are continuously turned on and some burners 8 are continuously closed when adjusting the temperature, it will cause large temperature differences in different areas. By controlling the multiple burners 8 in the second heating zone 12 to be ignited in sequence based on the second preset timing, temperature uniformity can be guaranteed, temperature stability can be achieved, temperature fluctuations are small, and the temperature difference between different positions in the same area is also small.

[0073] In some embodiments, the second preset timing may be the same as the first preset timing.

[0074] In some embodiments of the present application, the burners 8 included in the first heating device 2 and the second heating device 3 are divided into two groups, one group of burners 8 is arranged above the conveying device 4, and the other group of burners 8 is arranged below the conveying device 4. That is, the two groups of burners 8 in the first heating zone 11 are respectively located above and below the conveying device 4, and the two groups of burners 8 in the second heating zone 12 are also respectively located above and below the conveying device 4, so that the steel on the conveying device 4 can be better heated. The number of burners 8 in each group in the first heating zone 11 and the second heating zone 12 can be the same or different.

[0075] There is an insulation zone 14 between the first heating zone 11 and the second heating zone 12. The insulation zone 14 is provided with an insulation member 13. The interior of the heating chamber 1 is a connected space. The insulation zone 14 refers to the area inside the heating chamber 1 located between the first heating zone 11 and the second heating zone 12. There are two insulation members 13. One insulation member 13 is arranged at the top of the insulation zone 14, so that the insulation member 13 can better block the heat source located above the conveying device 4 in the first heating zone 11 and the second heating zone 12, forming a temperature difference between the first heating zone 11 and the second heating zone 12. The other insulation member 13 is arranged at the bottom of the insulation zone 14. Thus, the insulation member 13 can better block the heat source located below the conveying device 4 in the first heating zone 11 and the second heating zone 12, forming a temperature difference between the first heating zone 11 and the second heating zone 12.

[0076] In some embodiments, the thermal insulation member 13 refers to a component that can block heat. Since the steel needs to move from the first heating zone 11 to the second heating zone 12, the first heating zone 11 and the second heating zone 12 need to be connected. However, the temperatures of the first heating zone 11 and the second heating zone 12 are different. By setting the thermal insulation member 13, the mutual influence of the temperatures of the first heating zone 11 and the second heating zone 12 can be reduced, and the independent temperature control of the first heating zone 11 and the second heating zone 12 can be better achieved.

[0077] For example, a thermal insulation member 13 is arranged between the burner 8 located above the conveying device 4 in the first heating zone 11 and the burner 8 located above the conveying device 4 in the second heating zone 12; thereby, the thermal insulation member 13 can better block the heat source located above the conveying device 4 in the first heating zone 11 and the second heating zone 12, thereby forming a temperature difference between the first heating zone 11 and the second heating zone 12.

[0078] For example, another thermal insulation member 13 is provided between the burner 8 located below the conveying device 4 in the first heating zone 11 and the burner 8 located below the conveying device 4 in the second heating zone 12. Thus, the thermal insulation member 13 can better block the heat source located below the conveying device 4 in the first heating zone 11 and the second heating zone 12, thereby forming a temperature difference between the first heating zone 11 and the second heating zone 12.

[0079] In some embodiments of the present application, the thermal insulation member 13 is made of a thermal insulation material; thermal insulation material (thermal insulation material), a material that can block the transfer of heat flow, is also called thermal insulation material. Traditional thermal insulation materials, such as glass fiber, asbestos, rock wool, silicate, alumina fiber, refractory bricks, etc., and new thermal insulation materials, such as aerogel felt, vacuum panels, etc. Since the steel needs to move from the first heating zone 11 to the second heating zone 12, the first heating zone 11 and the second heating zone 12 need to be connected. However, the temperatures of the first heating zone 11 and the second heating zone 12 are different. By providing the thermal insulation member 13 with a thermal insulation material, the mutual influence of the temperatures of the first heating zone 11 and the second heating zone 12 can be reduced, and the independent temperature control of the first heating zone 11 and the second heating zone 12 can be better achieved. The length and height of the thermal insulation member 13 should be sufficient to form a temperature difference between the first heating zone 11 and the second heating zone 12, but should not be too large so that the temperature in the area where the thermal insulation member 13 is located is too low. Therefore, the length and height of the thermal insulation member 13 can be selected according to the temperature of the first heating zone 11 and the second heating zone 12 and the material of the thermal insulation member 13.

[0080] Example 2

[0081] FIG5 is a flow chart of a steel normalizing method provided in Example 2 of the present application. This embodiment is applicable to the case of normalizing steel pipes. The steel normalizing method is used in the steel normalizing equipment of any embodiment of the present application. The method can be executed by the control module of the steel normalizing equipment. As shown in FIG5 , the steel normalizing method includes:

[0082] S110. Control the conveying device to move the steel to the first heating zone, and stay in the first heating zone to heat the steel to a normalizing temperature in the first heating zone. The normalizing temperature is greater than or equal to 800 degrees Celsius and less than or equal to 950 degrees Celsius.

[0083] In some embodiments, the conveying device refers to a device that can drive the steel to move. Since the temperature of the first heating zone is the normalizing temperature, when the steel enters the first heating zone, it can be heated to the normalizing temperature in the first heating zone.

[0084] S120. Control the conveying device to drive the steel to move from the first heating zone to the second heating zone and stay in the second heating zone for a second preset time, so as to cool the steel in the second heating zone to the normalizing isothermal temperature and keep it at the normalizing isothermal temperature for a second preset time, wherein the normalizing isothermal temperature is greater than or equal to 550 degrees Celsius and less than or equal to 650 degrees Celsius, and the second preset time is greater than or equal to 20 minutes and less than or equal to 40 minutes.

[0085] In some embodiments, the first preset duration refers to the time the steel remains in the first heating zone 11 , and this duration is no less than the time required to heat the steel from its initial temperature to the normalizing temperature. Since the temperature of the second heating zone is maintained at the normalizing isothermal temperature, when the steel moves from the first heating zone to the second heating zone, it cools from the normalizing temperature to the normalizing isothermal temperature in the second heating zone. The time the steel remains in the second heating zone is the time it is held at the normalizing isothermal temperature. The longer the holding time, the closer the normalizing effect of the steel is to isothermal normalizing. The second preset duration is the preset holding time at the normalizing isothermal temperature. Therefore, the longer the second preset duration, the closer the normalizing effect of the steel is to isothermal normalizing.

[0086] In the related art, the holding time of isothermal normalizing varies from 2 to 7 hours depending on the type of steel. The steel moves at a uniform speed in the furnace. If the motor speed of the conveying device is too low, it will cause the steel to crawl on the conveying rollers, affecting the accurate control of the time of leaving the furnace. Therefore, the motor usually maintains a low speed to avoid crawling. In order to keep the steel warm in the furnace for a predetermined time, there must be a furnace chamber that is long enough. Therefore, the furnace body of the normalizing equipment in the related art is very long. And too long of isothermal holding time will cause the carbon in the steel to escape, resulting in surface decarburization.

[0087] The above scheme heats the steel to the normalizing temperature first, then cools the steel to the normalizing isothermal temperature in a short time, and keeps the steel at the normalizing isothermal temperature for a second preset time. In order to avoid decarburization of the steel surface, the second preset time of the insulation of this scheme is shorter than the isothermal normalizing time in the related art. The second preset time is greater than or equal to 20 minutes and less than or equal to 40 minutes, so it can form a similar isothermal normalizing effect: First, for steel with carbon on the surface, shortening the time of insulation at the normalizing isothermal temperature can prevent decarburization of the steel surface. For steel with zero carbon on the surface, the carburizing reaction during the insulation at the normalizing isothermal temperature can make the steel inside The carbon diffuses to the surface of the steel, but does not cause decarburization, which can achieve better carburizing and anti-decarburization effects; secondly, the motor of the conveying device must maintain a certain speed, and shortening the second preset time of insulation at the normalizing isothermal temperature can also shorten the length of the furnace body. The length of the steel normalizing equipment in this embodiment is between the equipment lengths of isothermal normalizing and ordinary normalizing, which can reduce the equipment footprint and save factory costs; thirdly, shortening the second preset time of insulation at the normalizing isothermal temperature can make the output higher than isothermal normalizing and the cost lower. Even if the normalizing equipment in the related technology is used, steel with better performance can be processed, and the output is higher and the cost is lower.

[0088] In some embodiments of the present application, the normalizing temperature is greater than or equal to 850 degrees Celsius and less than or equal to 900 degrees Celsius. When the steel material is a steel pipe, the normalizing temperature is greater than or equal to 850 degrees Celsius and less than or equal to 900 degrees Celsius, so that the performance of the normalized steel pipe is improved.

[0089] In some embodiments of the present application, the normalizing isothermal temperature is 600 degrees Celsius. When the steel material is a steel pipe, by setting the normalizing isothermal temperature to 600 degrees Celsius, the performance of the normalized steel pipe can be improved.

[0090] In some embodiments of the present application, the second preset time is 30 minutes. The second preset time is the preset holding time at the normalizing isothermal temperature. By setting the second preset time to 30 minutes, quasi-isothermal normalizing can be achieved, with a shorter holding time than isothermal normalizing, lowering unit energy consumption. The length of the steel normalizing equipment is between that of isothermal normalizing and conventional normalizing equipment, reducing floor space, and achieving higher output than isothermal normalizing at lower costs. This solves the problem of enabling normalizing equipment in related art to produce steel with superior performance.

[0091] In some embodiments of the present application, the steel normalizing method further comprises:

[0092] Get the feeding mode, which includes step-by-step and continuous.

[0093] In some embodiments, the feeding mode refers to the mode in which steel that needs to be normalized enters the heating chamber. The steel pipe normalizing furnace includes a loading section, a heating chamber, a rapid cooling section, a slow cooling section, and a discharge section, in the direction of the steel pipe's operation. In the continuous feeding mode, the conveyor rollers in each section maintain a consistent operating speed according to the time the steel needs to be heated and held in the furnace, and the steel runs at a constant speed on the roller conveyor. During the uniform operation of the steel, it will first be loaded by the loading section, then move to the first heating zone inside the heating chamber, then move to the second heating zone, then move out of the heating chamber to reach the rapid cooling section, and finally pass through the slow cooling section and be discharged from the discharge section. In the step-by-step feeding mode, after the steel is loaded, it is quickly transported by the conveyor device to a designated position in the first heating zone and stays there. After reaching the preset heating time or temperature, that is, after the steel is heated to the normalizing temperature, the steel is quickly transported by the conveyor device to a designated position in the second heating zone, stays there for a second preset time, and is quickly transported out of the furnace after the isothermal holding period is completed. That is, in the step-by-step feeding mode, the steel does not always run at a constant speed in the heating chamber at the set process speed, but moves at a set rhythm.

[0094] When the feeding mode is step-by-step and the steel remains in the first heating zone for a first preset time or in the second heating zone, the power member is controlled to drive the conveyor roller in the remaining zone to rotate a preset number of times in a preset pattern, wherein the preset number of turns is greater than or equal to 1 / 2 turn and less than or equal to 1 turn. The preset pattern can be a low-speed reciprocating motion.

[0095] In some embodiments, the predetermined pattern refers to a predetermined pattern of rotation of the conveyor roller. For example, the predetermined pattern may be that the conveyor roller first rotates clockwise a predetermined number of times, then rotates counterclockwise a predetermined number of times. Alternatively, the predetermined pattern may be that the conveyor roller first rotates counterclockwise a predetermined number of times, then rotates clockwise a predetermined number of times. The retention area is the area where the steel remains.

[0096] When the feeding mode is set to step-by-step, if the conveyor rollers included in the conveyor device are not rotated to allow the steel to remain in the second heating zone, the conveyor rollers will deform due to the heavy pressure of the steel at high temperatures. By controlling the power element to drive the conveyor rollers to rotate a preset number of times in a preset pattern, the conveyor rollers can be prevented from being compressed and deformed in the high temperature environment where the steel is kept warm.

[0097] In some embodiments, the preset number of turns is greater than or equal to 5 / 8 turns and less than or equal to 7 / 8 turns. For example, the preset number of turns is 3 / 4 turns.

[0098] In some embodiments of the present application, after obtaining the feeding mode, the steel normalizing method further includes:

[0099] Obtain a feeding mode switching instruction. The feeding mode switching instruction is an instruction for instructing the feeding mode to switch. Since there are two feeding modes, step-by-step and continuous, the feeding mode switching instruction will cause the feeding mode to switch between step-by-step and continuous.

[0100] When the feeding mode is a step-by-step mode, the feeding mode is switched to a continuous mode based on the feeding mode switching instruction.

[0101] When the feeding mode is continuous, the feeding mode is switched to step-by-step based on the feeding mode switching instruction.

[0102] Through the above method, the feeding mode of the steel normalizing equipment can be switched between step-by-step and continuous according to production needs.

[0103] The continuous feeding mode can meet the production needs of ordinary steel, such as implementing conventional normalizing processes in related technologies and producing steel with low performance requirements, and can also implement the steel normalizing method of the above embodiment. The step-by-step feeding mode can also implement the steel normalizing method of the above embodiment, providing more precise control of the normalizing process and achieving higher product quality. This embodiment provides switchable step-by-step and continuous feeding modes, allowing a single device to produce products of various specifications and qualities, adapting to different production needs and achieving full and effective utilization of the equipment.

[0104] The various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the multiple steps described in this application can be performed in parallel, sequentially, or in a different order, as long as the desired results of this application can be achieved.

Claims

1. A steel normalizing device, comprising a heating chamber (1), a first heating device (2), a second heating device (3), a conveying device (4), a control module (5), a first temperature monitoring component (6) and a second temperature monitoring component (7), wherein the heating chamber (1) comprises a first heating zone (11) and a second heating zone (12) which are connected to each other; The first temperature monitoring component (6) is configured to monitor the temperature of the first heating zone (11) and obtain first temperature information, the first heating device (2) is configured to heat the first heating zone (11), and the control module (5) is configured to obtain the first temperature information in real time and control the working state of the first heating device (2) based on the first temperature information so that the first temperature information is the normalizing temperature; The second temperature monitoring component (7) is configured to monitor the temperature of the second heating zone (12) and obtain second temperature information, the second heating device (3) is configured to heat the second heating zone (12), and the control module (5) is configured to obtain the second temperature information in real time and control the working state of the second heating device (3) based on the second temperature information so that the second temperature information is the normalizing isothermal temperature; The conveying device (4) is arranged inside the heating chamber (1) and is arranged to convey steel. The control module (5) is arranged to control the conveying device (4) to drive the steel to move to the first heating zone (11) and the second heating zone (12) in sequence, and to make the steel stay in the first heating zone (11) for a first preset time and / or stay in the second heating zone (12) for a second preset time.

2. The steel normalizing equipment according to claim 1, wherein: The control module (5) is configured to perform at least one of the following operations: adjusting the duty cycle of the first heating device (2) based on the first temperature information so that the first temperature information is a normalizing temperature; The duty cycle of the second heating device (3) is adjusted based on the second temperature information so that the second temperature information is the normalizing isothermal temperature.

3. The steel normalizing equipment according to claim 2, wherein: The control module (5) comprises a temperature controller (51) and a main controller (52); the first heating zone (11) and the second heating zone (12) each comprise a plurality of temperature control zones, each of the temperature control zones is provided with at least one of the temperature controllers (51) and at least one of the first temperature monitoring components (6); the main controller (52) is electrically connected to the temperature controller (51); The temperature controller (51) of the first heating zone (11) is configured to obtain in real time the first temperature information monitored by the first temperature monitoring component (6) of the temperature control zone where it is located, and output it to the main controller (52); the main controller (52) is configured to control the duty cycle of the first heating device (2) of the corresponding temperature control zone based on the first temperature information, so that the first temperature information of the corresponding temperature control zone is the normalizing temperature; The temperature controller (51) of the second heating zone (12) is configured to obtain in real time the second temperature information monitored by the second temperature monitoring component (7) of the temperature control zone where it is located, and output the second temperature information to the main controller (52); the main controller (52) is configured to control the corresponding temperature control zone based on the second temperature information. The duty cycle of the second heating device (3) in the zone is adjusted so that the second temperature information of the corresponding temperature control zone is the normalizing isothermal temperature.

4. The steel normalizing equipment according to claim 3, wherein: The control module (5) further comprises an over-temperature controller (53), wherein the over-temperature controller (53) is electrically connected to the main controller (52), and the over-temperature controller (53) is configured to determine whether the first temperature information exceeds a first preset temperature and whether the second temperature information exceeds a second preset temperature, and in response to the first temperature information exceeding the first preset temperature or the second temperature information exceeding the second preset temperature, send an alarm message to the main controller (52).

5. The steel normalizing equipment according to claim 4, wherein: The over-temperature controller (53) is also configured to determine whether the difference between the first temperature information and the normalizing temperature exceeds a first preset difference and to determine whether the difference between the second temperature information and the normalizing isothermal temperature exceeds a second preset difference, and to send an alarm message to the main controller (52) in response to the difference between the first temperature information and the normalizing temperature exceeding the first preset difference or the difference between the second temperature information and the normalizing isothermal temperature exceeding the second preset difference.

6. The steel normalizing equipment according to any one of claims 1 to 5, wherein: The first heating device (2) and the second heating device (3) both comprise a plurality of burners (8).

7. The steel normalizing equipment according to claim 6, wherein: The control module (5) is configured to perform at least one of the following operations: Controlling the plurality of burners (8) located in the first heating zone (11) to ignite in sequence based on a first preset timing; Based on a second preset timing control, the plurality of burners (8) located in the second heating zone (12) are ignited in sequence.

8. The steel normalizing equipment according to claim 6, wherein: The burners (8) included in the first heating device (2) and the second heating device (3) are divided into two groups, one group of burners (8) is arranged above the conveying device (4), and the other group of burners (8) is arranged below the conveying device (4); A heat insulating zone (14) is provided between the first heating zone (11) and the second heating zone (12), and the heat insulating zone (14) is provided with a heat insulating member (13); the number of the heat insulating members (13) is two, one of the heat insulating members (13) is provided at the top of the heat insulating zone (14), and the other of the heat insulating members (13) is provided at the bottom of the heat insulating zone (14).

9. The steel normalizing equipment according to any one of claims 1 to 5, wherein: The conveying device (4) comprises a conveying roller (41) and a power member, the number of the conveying rollers (41) is multiple, and the power member is configured to drive the multiple conveying rollers (41) to rotate so as to convey the steel.

10. A steel normalizing method, used in the steel normalizing equipment according to any one of claims 1 to 9, the steel normalizing method comprising: Controlling the conveying device to drive the steel to move to the first heating zone, and staying in the first heating zone for a first preset time to heat the steel to a normalizing temperature in the first heating zone, wherein the normalizing temperature is greater than or equal to 800 degrees Celsius and less than or equal to 950 degrees Celsius; The conveying device is controlled to drive the steel to move from the first heating zone to the second heating zone and stay in the second heating zone for a second preset time, so as to cool the steel to a normalizing isothermal temperature in the second heating zone and keep the steel at the normalizing isothermal temperature for the second preset time, wherein the normalizing isothermal temperature is greater than or equal to 550 degrees Celsius and less than or equal to 650 degrees Celsius, and the second preset time is greater than or equal to 20 minutes and less than or equal to 40 minutes.

11. The steel normalizing method according to claim 10, further comprising: Obtaining a feeding mode, wherein the feeding mode includes a step-by-step mode and a continuous mode; In response to the feeding mode being step-by-step and the steel staying in the first heating zone for a first preset time or staying in the second heating zone for a second preset time, the power member is controlled to drive the conveying roller in the staying area to rotate a preset number of times according to a preset rule, and the preset number of turns is greater than or equal to 1 / 2 turn and less than or equal to 1 turn.

12. The steel normalizing method according to claim 11, after acquiring the feed mode, the method further comprises: Get the feeding mode switching instruction; In response to the feeding mode being a step-by-step mode, switching the feeding mode to a continuous mode based on the feeding mode switching instruction; In response to the feeding mode being continuous, the feeding mode is switched to stepwise based on the feeding mode switching instruction.

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