A pusher furnace cooling rate control apparatus and method of use

Abstract

The application discloses a trolley furnace cooling rate control device and a use method thereof, relates to the technical field of trolley heat treatment furnaces, and comprises a cooling air duct, a cooling air pipe, a controllable cooling zone valve, a cooling fan, a frequency converter and a thermocouple. The stable control of the cooling rate of the trolley furnace is realized by detecting the temperature through the thermocouple, obtaining the actual temperature difference with the trolley furnace temperature, and controlling the opening of the controllable cooling zone valve and the rotating speed of the cooling fan of the frequency converter in real time. Different cooling measures are taken for different temperature differences, the stable control of the cooling rate of the trolley furnace is ensured, the problem of uneven rate in the cooling process of the trolley furnace is solved, and the rate in the cooling process of the trolley furnace can be effectively controlled.

Description

Technical Field

[0001] This application relates to the field of bogie hearth heat treatment furnace technology, and in particular to a bogie hearth furnace cooling rate control device and its usage method. Background Technology

[0002] A bogie hearth furnace is a large-scale heating furnace that uses bogies to feed large carbon steel and alloy steel parts into which heat treatment processes such as heating, annealing, normalizing, tempering, surface hardening, and tempering can be performed. When using a bogie hearth furnace to perform stress-relief annealing on parts, the temperature inside the bogie hearth furnace needs to be slowly and precisely controlled during the cooling stage to ensure that the internal stress of the parts is minimized after cooling.

[0003] The existing bogie furnace cannot precisely control the cooling rate during the cooling process. It can only cool down along with the furnace. The cooling rate is relatively fast in the early stage, but very slow in the later stage, resulting in a long furnace occupation time and relatively large stress after stress-relief annealing of the product.

[0004] Therefore, we need a bogie furnace cooling rate control device and its usage method to solve the problem of uneven cooling rate during the bogie furnace cooling process, which can effectively control the cooling rate of the bogie furnace. Summary of the Invention

[0005] The purpose of this application is to solve the problem of uneven cooling rate during the bogie furnace cooling process. In order to solve the above problem, this application provides a bogie furnace cooling rate control device and its usage method, which can effectively control the cooling rate of the bogie furnace during the cooling process.

[0006] To achieve the above objectives, the embodiments of this application adopt the following technical solutions:

[0007] A bogie furnace cooling rate control device includes: a cooling air duct, which is disposed above the bogie furnace and has exhaust holes on both sides, with multiple exhaust holes; and a cooling air pipe, which has exhaust ports, with multiple exhaust ports connected to the exhaust holes, and the cooling air pipe is used for the circulation of hot air from the bogie furnace.

[0008] A controllable cold zone valve is installed on the cooling duct and is used to control the size of the opening of the cooling duct; a cooling fan is connected to the cooling duct and is used to extract hot air from the cooling duct to the outside to reduce the temperature of the bogie furnace; a frequency converter is connected to the cooling fan and is used to control the speed of the cooling fan; and a thermocouple is connected to the frequency converter and the controllable cold zone valve. The thermocouple is used to measure the temperature and compare it with the set temperature, and to control the frequency converter and the controllable cold zone valve.

[0009] The cooling rate of the bogie furnace is stably controlled by measuring the temperature with thermocouples and comparing it with the set temperature. Based on the temperature difference, the size of the cooling air vents opened by the controllable cold zone valve is adjusted, as well as the speed and power of the cooling fan are adjusted and adjusted in real time to achieve stable control of the cooling rate of the bogie furnace.

[0010] In the above technical solution, the embodiment of this application uses thermocouples to detect the temperature and obtain the actual temperature difference between the thermocouple and the furnace temperature. The inverter controls the opening of the controllable cold zone valve and the speed of the cooling fan in real time, and different cooling measures are taken for different temperature differences to ensure stable control of the cooling rate of the thermocouple furnace.

[0011] Furthermore, according to an embodiment of this application, there are two cooling ducts, which are respectively located on both sides of the cooling air duct.

[0012] Furthermore, according to an embodiment of this application, there are two controllable cold zone valves, which are respectively connected to two cooling air ducts.

[0013] Furthermore, according to an embodiment of this application, two cooling fans are provided, each connected to one of two cooling ducts.

[0014] Furthermore, according to an embodiment of this application, two thermocouples are provided, respectively located on both sides of the cooling air duct, for detecting the temperature on both sides of the cooling air duct.

[0015] Furthermore, according to the embodiments of this application, the cooling duct is composed of multiple pipe sections connected together, which are divided into a main duct, connecting pipes and branch ducts.

[0016] Furthermore, according to an embodiment of this application, three exhaust ports are distributed on the branch pipeline.

[0017] Furthermore, according to an embodiment of this application, three branch pipelines are provided, which are connected to the main pipeline via connecting pipes.

[0018] Furthermore, according to an embodiment of this application, a control valve is also provided on the connecting pipe, and the control valve is connected to a thermocouple for precise control of the airflow at the vents of each branch pipe.

[0019] This application also discloses a method for using a bogie furnace cooling rate control device, including:

[0020] The temperature is detected by thermocouples and compared with the actual temperature of the trolley furnace.

[0021] Cooling method 1: When the temperature difference between the thermocouple-detected temperature and the actual temperature of the trolley furnace is greater than 2°C, control the controllable cold zone valve to open by 30%.

[0022] Second, when the temperature difference between the thermocouple-detected temperature and the actual temperature of the trolley furnace exceeds 4°C, the controllable cold zone valve is opened by 50%, and the frequency converter is controlled to turn the cooling fan to a low speed for cooling.

[0023] Thirdly, when the temperature difference between the thermocouple-detected temperature and the actual temperature of the trolley furnace exceeds 6°C, the controllable cold zone valve is opened by 70%, and the frequency converter is controlled to turn the cooling fan to high speed for cooling.

[0024] Fourthly, when the temperature difference between the thermocouple-detected temperature and the actual temperature of the furnace on the trolley exceeds 10°C, the controllable cold zone valve is opened to 100%, and the frequency converter is controlled to turn the cooling fan to high speed for cooling.

[0025] Compared with the prior art, this application uses thermocouples to detect the temperature and obtain the actual temperature difference between the thermocouple and the furnace temperature. It also controls the opening degree of the controllable cold zone valve and the speed of the cooling fan in real time by controlling the frequency converter. Different cooling measures are taken for different temperature differences, which ensures the stable control of the cooling rate of the thermocouple furnace and solves the problem of uneven cooling rate during the cooling process of the thermocouple furnace. It can effectively control the cooling rate of the thermocouple furnace. Attached Figure Description

[0026] The present application will be further described below with reference to the accompanying drawings and embodiments.

[0027] Figure 1 This is a schematic diagram of a cooling air duct in a bogie furnace cooling rate control device.

[0028] Figure 2 This is a schematic diagram of a cooling duct in a bogie furnace cooling rate control device.

[0029] Figure 3 This is a schematic diagram of a bogie furnace cooling rate control device.

[0030] Figure 4 This is a schematic diagram of a bogie furnace cooling rate control device with an added hot air circulation system.

[0031] Figure 5 This is a schematic diagram of a bogie furnace cooling rate control device with added flow stabilization and hot air circulation devices.

[0032] In the attached diagram

[0033] 1. Cooling air duct; 11. Exhaust vent; 12. Air intake.

[0034] 2. Cooling duct 21, main pipe 211, exhaust port

[0035] 22. Control valve; 23. Connecting pipe; 24. Branch pipeline

[0036] 3. Cooling fan 4. Frequency converter 5. Thermocouple

[0037] 6. Controllable cooling zone valve; 7. Circulating pump; 8. Flow stabilizer.

[0038] 9. Perforated mesh Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the present invention clear and complete, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of the present invention, and are merely illustrative of the embodiments of the present invention. They are not intended to limit the embodiments of the present invention. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] In the description of this invention, it should be noted that the terms "center," "middle," "upper," "lower," "left," "right," "inner," "outer," "top," "bottom," "side," "vertical," and "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "a," "first," "second," "third," "fourth," "fifth," and "sixth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0041] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0042] For purposes of simplicity and illustration, the principles of the embodiments are described primarily by way of example. In the following description, numerous specific details are set forth to provide a thorough understanding of the embodiments. However, it will be apparent to those skilled in the art that these embodiments may not be limited to these specific details in practice. In some instances, well-known methods and structures have not been described in detail to avoid unnecessarily obscuring these embodiments. Furthermore, all embodiments can be used in combination with each other.

[0043] Example 1: As Figure 1-3As shown, a bogie furnace cooling rate control device includes:

[0044] Cooling air duct 1 is located above the bogie furnace. Exhaust holes 11 are provided on both sides of the cooling air duct 1, and there are multiple exhaust holes 11. Cooling air pipe 2 is provided with exhaust ports 211, and there are multiple exhaust ports 211. The exhaust ports 211 are connected to the exhaust holes 11. Cooling air pipe 2 is used for the circulation of hot air from the bogie furnace.

[0045] A controllable cold zone valve 6 is installed on the cooling duct 2 and is used to control the size of the opening of the air vent in the cooling duct 2; a cooling fan 3 is connected to the cooling duct 2 and is used to extract hot air from the cooling duct 2 to the outside to reduce the temperature of the bogie furnace; a frequency converter 4 is connected to the cooling fan 3 and is used to control the speed of the cooling fan 3; a thermocouple 5 is connected to the frequency converter 4 and the controllable cold zone valve 6 and is used to measure the temperature and compare it with the set temperature, and to control the frequency converter 4 and the controllable cold zone valve 6.

[0046] The cooling rate of the bogie furnace is stably controlled by thermocouple 5 measuring the temperature and comparing it with the set temperature. Based on the temperature difference, the size of the opening of the cooling air duct 2 is adjusted by the controllable cold zone valve 6, and the speed and power of the cooling fan 3 are adjusted and adjusted in real time to achieve stable control of the cooling rate of the bogie furnace.

[0047] There are two cooling ducts 2, one on each side of the cooling air duct 1. There are two controllable cooling zone valves 6, one connected to each of the two cooling ducts 2. There are two cooling fans 3, one connected to each of the two cooling ducts 2. There are two thermocouples 5, one on each side of the cooling air duct 1, used to detect the temperature on both sides of the cooling air duct 1. The cooling duct 2 is composed of multiple pipe sections connected together, divided into a main pipe 21, a connecting pipe 23 and branch pipes 24. Three exhaust ports 211 are distributed on the branch pipes 24. The three branch pipes 24 are connected to the main pipe 21 through the connecting pipes 23. A control valve 22 is also installed on the connecting pipe 23. The control valve 22 is connected to the thermocouples 5 and used to precisely control the airflow of each branch pipe 24.

[0048] Temperature is detected by thermocouple 5, and the actual temperature difference between the thermocouple 5 and the furnace temperature is obtained. The opening degree of the controllable cold zone valve 6 and the speed of the cooling fan 3 are controlled in real time by the frequency converter 4. Different cooling measures are taken for different temperature differences, which ensures the stable control of the cooling rate of the thermocouple furnace and solves the problem of uneven cooling rate during the cooling process of the thermocouple furnace. It can effectively control the cooling rate of the thermocouple furnace.

[0049] Example 2: Figure 4 As shown, based on Embodiment 1, this embodiment further improves the cooling duct 1 by adding a hot air circulation device:

[0050] Air intake 12 is located on cooling air duct 1;

[0051] The circulating pump 7 is installed on the cooling air duct 1. There are two circulating pumps 7. The circulating pump 7 is connected to the air intake 12. The circulating pump 7 is used to draw hot air from the bogie furnace through the air intake 12 and transmit it to the bogie furnace through the cooling pipe for circulation.

[0052] By using the air intake 12 installed on the cooling air duct 1 and the circulating pump 7 installed on the cooling air duct 1 and connected to the air intake 12, the hot air from the bogie furnace can be drawn in through the air intake 12 and transmitted through the inverted U-shaped cooling air duct 1, and discharged to the area around the bogie furnace for hot air circulation. This ensures a stable and slow temperature drop, avoids uneven cooling rate of the bogie furnace, solves the problem of uneven cooling rate during the bogie furnace cooling process, and can effectively control the cooling rate of the bogie furnace.

[0053] Example 3: Figure 5 As shown, based on Embodiment 2, this embodiment further improves the cooling air duct 1 by adding a flow stabilizing device:

[0054] Perforated mesh plate 9 is disposed in the cooling air duct 1 and is used to ensure uniform hot air flow.

[0055] The flow stabilizer 8 is installed inside the air intake 12;

[0056] By installing a perforated mesh plate 9 and a flow stabilizer plate 8 inside the air intake 12 and the cooling air duct 1, the flow stabilizer plate 8 can stabilize the hot air flow in advance during the process of the circulating pump 7 drawing hot air from the bogie furnace, making the flow rate of each part the same and the transmission more stable. In the subsequent transmission through the cooling pipe, the perforated mesh plate 9 can further disperse the transmitted gas, making the subsequent transmission flow rate more consistent, so as to make the cooling rate of the bogie furnace more stable and avoid the uneven cooling rate of the bogie furnace. This further solves the problem of uneven cooling rate during the cooling process of the bogie furnace and can effectively control the cooling rate of the bogie furnace.

[0057] Example 4: Figure 1-5 As shown, based on Embodiment 3, this embodiment also provides a method for using the bogie furnace cooling rate control device, including:

[0058] The temperature is detected by thermocouple 5 and compared with the actual temperature of the trolley furnace.

[0059] Cooling method 1: When the temperature difference between thermocouple 5 and the actual temperature of the trolley furnace is greater than 2°C, control the controllable cold zone valve 6 to open by 30%.

[0060] Second, when the temperature difference between thermocouple 5 and the actual temperature of the furnace on the trolley is greater than 4°C, control the controllable cold zone valve 6 to open 50% and control the frequency converter 4 to turn on the cooling fan 3 to a low speed for cooling.

[0061] Thirdly, when the temperature difference between thermocouple 5 and the actual temperature of the furnace on the trolley is greater than 6°C, control the controllable cold zone valve 6 to open 70% and control the frequency converter 4 to turn on the cooling fan 3 to high speed for cooling.

[0062] Fourthly, when the temperature difference between the thermocouple 5 and the actual temperature of the furnace on the trolley is greater than 10°C, the controllable cold zone valve 6 is opened to 100%, and the frequency converter 4 is turned on to the high speed of the cooling fan 3 for cooling.

[0063] The heating is stopped when the temperature difference between the temperature detected by thermocouple 5 and the actual temperature of the trolley furnace is less than -10℃, and heating continues when the temperature difference is greater than -10℃ and the hysteresis temperature.

[0064] Although the illustrative specific embodiments of this application have been described above to enable those skilled in the art to understand this application, this application is not limited to the scope of the specific embodiments. For those skilled in the art, all applications utilizing the concept of this application are protected as long as various variations are within the spirit and scope of this application as defined and determined by the appended claims.

Claims

1. A device for controlling the cooling rate of a bogie furnace, comprising: A cooling air duct is provided above the bogie furnace, and exhaust holes are provided on both sides of the cooling air duct, with multiple exhaust holes provided. A cooling duct is provided with an exhaust port. Multiple exhaust ports are provided and connected to an exhaust hole. The cooling duct is used for the circulation of hot air from the bogie furnace. Its characteristic is that it has a controllable cold zone valve, which is disposed on the cooling air duct and is used to control the size of the opening of the cooling air duct; A cooling fan is connected to the cooling duct. The cooling fan is used to draw hot air from the cooling duct to the outside to reduce the temperature of the bogie furnace. A frequency converter is connected to the cooling fan, and the frequency converter is used to control the speed of the cooling fan; A thermocouple is connected to the frequency converter and the controllable cold zone valve. The thermocouple is used to measure the temperature and compare it with the set temperature, and to control the frequency converter and the controllable cold zone valve. The cooling rate of the bogie furnace is stably controlled by the thermocouple measuring the temperature and comparing it with the set temperature. Based on the temperature difference, the size of the opening of the cooling air duct vent of the controllable cold zone valve is adjusted, and the speed and power of the cooling fan are adjusted and adjusted in real time to achieve stable control of the cooling rate of the bogie furnace. The hot air circulation device equipped with the cooling air duct includes an air intake and a circulation pump. The air intake and the circulation pump are arranged on the cooling air duct, which is inverted U-shaped. The circulating pump is connected to the air intake. The circulating pump is used to draw hot air from the bogie furnace through the air intake and transmit it to the bogie furnace through the cooling pipe for circulation.

2. The bogie furnace cooling rate control device according to claim 1, characterized in that, There are two cooling ducts, which are respectively located on both sides of the cooling air duct.

3. The bogie furnace cooling rate control device according to claim 2, characterized in that, Two controllable cold zone valves are provided, each connected to one of the two cooling air ducts.

4. The bogie furnace cooling rate control device according to claim 2, characterized in that, There are two cooling fans, which are connected to the two cooling ducts respectively.

5. The bogie furnace cooling rate control device according to claim 1, characterized in that, Two thermocouples are provided, one on each side of the cooling duct, for detecting the temperature on each side of the cooling duct.

6. The bogie furnace cooling rate control device according to claim 1, characterized in that, The cooling duct is composed of multiple pipe sections connected together, divided into a main duct, connecting pipes, and branch ducts.

7. The bogie furnace cooling rate control device according to claim 6, characterized in that, The branch pipeline has three exhaust ports distributed on it.

8. The bogie furnace cooling rate control device according to claim 6, characterized in that, The branch pipeline is provided in three parts, which are connected to the main pipeline through the connecting pipe.

9. The bogie furnace cooling rate control device according to claim 6, characterized in that, The connecting pipe is also equipped with a control valve, which is connected to the thermocouple and is used to precisely control the airflow at the vents of each of the branch pipes.

10. A method of using a bogie furnace cooling rate control device, characterized in that, The cooling rate control device for a bogie furnace as described in any one of claims 1-9 is used in a method comprising: detection, wherein the temperature is detected by the thermocouple and compared with the actual temperature of the bogie furnace chamber; Cooling method 1: When the temperature difference between the thermocouple-detected temperature and the actual temperature of the trolley furnace is greater than 2°C, control the controllable cold zone valve to open by 30%. Second, when the temperature difference between the thermocouple-detected temperature and the actual temperature of the trolley furnace is greater than 4°C, the controllable cold zone valve is opened by 50%, and the frequency converter is controlled to turn the cooling fan to a low speed for cooling. Thirdly, when the temperature difference between the thermocouple-detected temperature and the actual temperature of the trolley furnace exceeds 6°C, the controllable cold zone valve is opened by 70%, and the frequency converter is controlled to turn the cooling fan to high speed for cooling. Fourthly, when the temperature difference between the thermocouple-detected temperature and the actual temperature of the trolley furnace exceeds 10°C, the controllable cold zone valve is opened to 100%, and the frequency converter is controlled to turn the cooling fan to high speed for cooling.

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