Tempering furnace conveying system and using method thereof

Abstract

The invention relates to a tempering furnace conveying system and a using method thereof, and belongs to the technical field of tempering furnaces, the tempering furnace conveying system comprises a tempering furnace body, a high-temperature-resistant conveying mechanism, a heat circulation module, an intelligent control system and a waste heat recovery module, and the high-temperature-resistant conveying mechanism comprises a chain transmission roller way conveyor, a cooling-water machine and a buried pipe type water cooling plate. The high-temperature-resistant conveying mechanism is arranged, the heat-resistant alloy roller is arranged on the upper layer, the water-cooled supporting frame is arranged on the lower layer, the high-temperature environment is adapted, the heat circulation module is arranged, the multiple sets of heating pipes are arranged on the top and the side wall of the hearth, the centrifugal circulating fan is combined, air flow up-down convection is forced, and therefore temperature uniformity can be ensured; the temperature sensor, the infrared workpiece detector and the tempering furnace PLC are integrated, so that the conveying speed, the furnace temperature and the fan rotating speed can be adjusted in real time, the waste heat recovery structure is arranged, waste gas waste heat can be used for preheating workpieces entering the furnace, and therefore energy consumption is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of tempering furnaces, and in particular to a tempering furnace conveying system and a method for using the same. Background Art

[0002] A tempering furnace is an industrial equipment used in metal heat treatment processes, mainly for tempering quenched metal workpieces. By controlling the heating temperature and holding time, the tempering furnace can adjust the mechanical properties of materials such as hardness, toughness, and internal stress to achieve the required comprehensive performance.

[0003] The tempering furnace conveying system is a key component of the tempering furnace, responsible for automatically and continuously conveying workpieces during the heat treatment process to ensure efficient production and process consistency. The conveying systems of traditional tempering furnaces mostly use chain or roller conveyor mechanisms with a fixed speed, resulting in poor temperature uniformity, insufficient internal heat circulation in the furnace, easy uneven heating of workpieces, fixed conveying speed, difficulty in adapting to different process requirements, lack of waste heat recovery and precise temperature control, serious energy waste, and dependence on manual monitoring, which easily leads to process fluctuations. To further improve temperature uniformity, reduce energy consumption, and improve applicability, a tempering furnace conveying system and a method for using the same are proposed. It is provided with a high-temperature resistant conveying mechanism, with heat-resistant alloy rollers on the upper layer and a water-cooled support frame on the lower layer to adapt to high-temperature environments. It is provided with a heat circulation module, with multiple groups of heating tubes arranged on the top and side walls of the furnace chamber, combined with a centrifugal circulation fan to force the air flow to convect up and down, thereby ensuring temperature uniformity. It is provided with an intelligent control system, integrating a temperature sensor, an infrared workpiece detector, and a tempering furnace PLC controller, thereby enabling real-time adjustment of the conveying speed, furnace temperature, and fan speed. It is provided with a waste heat recovery structure, which can use the waste heat of the exhaust gas to preheat the workpieces entering the furnace, thereby saving energy consumption. Summary of the Invention

[0004] The present invention provides a tempering furnace conveying system and a method for using the same, which solve the problems proposed in the above background art, can effectively improve temperature uniformity, reduce workpiece quality fluctuations, and reduce energy consumption through waste heat recovery, temperature control adjustment, and heat circulation module.

[0005] The solution of the present invention to the above technical problems is as follows: A tempering furnace conveying system includes a tempering furnace body, a high-temperature resistant conveying mechanism, a heat circulation module, an intelligent control system, and a waste heat recovery module. The high-temperature resistant conveying mechanism includes a chain drive roller conveyor, a chiller, and a buried tube water-cooled plate. The chain drive roller conveyor is evenly provided with heat-resistant alloy rollers. The chain drive roller conveyor is driven by a variable frequency motor. A conveying layer and a water-cooled layer are arranged inside the chain drive roller conveyor. The buried tube water-cooled plate is installed in the water-cooled layer. The conveying layer is rotationally connected to the heat-resistant alloy rollers through bearings. A heat exchange cavity is arranged on the inner wall of the heat-resistant alloy rollers. The buried tube water-cooled plate is provided with a water-cooling pipeline. The water-cooling pipeline is evenly and fixedly communicated with a water outlet pipe and a return pipe. The chiller is fixedly communicated with a circulating water pump. One end of the water-cooling pipeline is communicated with the circulating water pump, and the other end is communicated with the return port of the chiller. The tempering furnace body is fixedly connected to the chain drive roller conveyor. The tempering furnace body is evenly provided with hydraulic lifting partition doors. The tempering furnace body is divided into a preheating cavity, a heating cavity, and a cooling cavity by the hydraulic lifting partition doors;

[0006] The heat circulation module includes electric heating tubes and a centrifugal circulating fan. The electric heating tubes are installed inside the tempering furnace body. The centrifugal circulating fan is installed at the heating cavity of the tempering furnace body;

[0007] The intelligent control system includes temperature sensors, an infrared workpiece detector, and a tempering furnace PLC controller. The temperature sensors are evenly installed on the tempering furnace body. The tempering furnace PLC controller is installed on the tempering furnace body;

[0008] The waste heat recovery module includes a waste heat recovery pump, a cooling fan, an exhaust pump, a cooling air hood, a waste heat recovery air hood, and an exhaust air hood. The cooling air hood and the waste heat recovery air hood are both installed in the cooling cavity. The exhaust air hood is installed in the preheating cavity. Both ends of the waste heat recovery pump are communicated with the waste heat recovery air hood and the exhaust air hood respectively. The cooling fan and the exhaust pump are communicated;

[0009] The usage method includes the following steps:

[0010] S1, System startup and initialization: Turn on the chiller, transfer water to the water-cooling pipeline in the heat exchange cavity through the circulating water pump. The cooling water is evenly discharged from the water outlet pipe into the heat exchange cavity of the heat-resistant alloy rollers and then discharged through the return pipe. The heat-resistant alloy rollers are rotationally communicated with the water outlet pipe and the return pipe through sealed bearings. The return pipe returns to the chiller through another section of the water-cooling pipeline for recycling, ensuring that the temperature of the chain drive roller conveyor ≤ 60°C. Start the tempering furnace PLC controller, load the preset process recipe, and set the heating temperature of the electric heating tubes, thereby setting the tempering heating temperature of the heating cavity;

[0011] S2, Workpiece Feeding and Parameter Setting: Place the workpiece on the heat-resistant alloy roller of the chain-driven roller conveyor. The infrared workpiece detector can scan the size. Set in the PLC controller of the tempering furnace: the target temperature of the electric heating tube, the tempering heating time of the heating chamber, and the maximum allowable temperature difference in the heating chamber;

[0012] S3, Workpiece Heating Stage: The PLC controller of the tempering furnace calculates the initial conveying speed according to the workpiece heat load, and the calculation formula is as follows;

[0013] (Q = ρ·C·V·△T)

[0014] The electric heating tubes are heated to the target temperature in stages, and the centrifugal circulation fan starts forced convection;

[0015] S4, Workpiece Tempering Stage: The chain-driven roller conveyor transfers the workpiece to the heating chamber through the heat-resistant alloy roller for tempering heating. After the transfer is in place, the hydraulic lifting partition door is started to drop to separate the preheating chamber, heating chamber, and cooling chamber to reduce heat leakage. The temperature sensor monitors the temperature at multiple points in the furnace in real time, and the PID algorithm dynamically adjusts the heating power to maintain the temperature fluctuation ≤ ±5°C. If the detected temperature difference exceeds the limit, the fan speed is increased to strengthen the circulation until the tempering heating time is reached;

[0016] S5, Cooling and Discharging: After the tempering heating is completed, the hydraulic lifting partition door is opened, and the chain-driven roller conveyor moves the workpiece from the heating chamber to the cooling chamber. In the cooling chamber, the temperature sensor can detect the residual heat temperature. If the residual heat waste gas temperature is greater than >300°C, the waste heat recovery pump is started to transfer the waste heat waste gas to the exhaust air hood, so that the waste heat waste gas can be transferred to the preheating chamber for preheating the internal workpiece, reducing the initial heating energy consumption. When the temperature ≤ 300°C, the cooling fan and the exhaust pump are started. The cooling fan can transfer the outer wall to the cooling chamber through the two-side cooling air hoods to cool the internal workpiece by air cooling, and the exhaust pump can extract air to accelerate the air cooling efficiency. The air cooling component cools the workpiece to below 80°C.

[0017] On the basis of the above technical solutions, the present invention can also be improved as follows.

[0018] Further, in S3, the temperature of the heating chamber is detected. If the temperature > set value + 20°C, the PLC controller of the tempering furnace automatically turns off the electric heating tube and opens the hydraulic lifting partition door, and controls the chain-driven roller conveyor to take out the workpiece to prevent damage to the workpiece.

[0019] Further, the heat exchange chamber is provided with an S-shaped cold water circulation pipeline, and the water outlet pipe and the return pipe are respectively rotationally connected to both ends of the heat exchange chamber of the heat-resistant alloy roller through sealed bearings.

[0020] Further, there are three groups of electric heating tubes, and the three groups of electric heating tubes are respectively installed on both sides and the top of the inner wall of the heating chamber of the tempering furnace body.

[0021] Further, three groups of the temperature sensors are provided, and the three groups of temperature sensors are respectively installed in the preheating chamber, the heating chamber, and the cooling chamber of the tempering furnace body. Eight temperature sensors are provided in the heating chamber, and the eight temperature sensors are respectively placed at the four corners of the upper side and the four corners of the lower side of the heating chamber.

[0022] Further, the tempering furnace PLC controller is signal-connected to the chain drive roller conveyor, the hydraulic lifting partition door, the electric heating tube, the centrifugal circulating fan, the temperature sensor, the infrared workpiece detector, the waste heat recovery pump, the cooling fan, and the exhaust pump.

[0023] Further, three cooling air hoods are provided. The two side cooling air hoods are communicated with the cooling fan, and the middle cooling air hood is communicated with the exhaust pump. A pressure relief valve is provided in the cooling chamber.

[0024] The beneficial effects of the present invention are as follows: The present invention provides a tempering furnace conveying system and its use method, which have the following advantages:

[0025] 1. The heating tubes on multiple sides and the centrifugal fan work together to form a closed-loop air flow, eliminate cold and hot spots. The furnace temperature at each position can be real-time fed back through eight temperature detectors. Combining with the PID algorithm to dynamically adjust the heating power, the temperature difference control accuracy can reach within ±5°C, thereby avoiding hardness fluctuations, deformation or residual stress caused by uneven heating of the workpiece, improving the consistency of the finished product, and being applicable to high-precision aerospace, automotive parts and other high-end manufacturing fields.

[0026] 2. The waste heat recovery module is provided to recover the waste heat of the exhaust gas at the discharge port. The waste heat of the exhaust gas can preheat the workpieces entering the furnace, thereby reducing the initial energy consumption of the heating tubes, effectively saving energy and reducing energy consumption.

[0027] 3. The upper heat-resistant alloy roller and the lower water-cooled structure can effectively prevent structural deformation, thereby effectively improving the service life of the conveying mechanism, and being applicable to continuous production scenarios, such as an automotive parts factory operating 24 hours a day.

[0028] 4. Such a tempering furnace conveying system is provided with a high-temperature resistant conveying mechanism. The upper layer is a heat-resistant alloy roller, and the lower layer is a water-cooled support frame, adapting to high-temperature environments. It is provided with a heat circulation module, and multiple groups of heating tubes are arranged on the top and side walls of the furnace chamber. Combining with the centrifugal circulating fan, forced air flow is convected up and down, thereby ensuring temperature uniformity. It is provided with an intelligent control system, integrating a temperature sensor, an infrared workpiece detector and a tempering furnace PLC controller, thereby being able to real-time adjust the conveying speed, furnace temperature and fan speed. It is provided with a waste heat recovery structure, which can use the waste heat of the exhaust gas to preheat the workpieces entering the furnace, thereby saving energy consumption.

[0029] The above description is only an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and implement it in accordance with the content of the description, the following provides a detailed description with reference to the preferred embodiments of the present invention and the accompanying drawings. The specific implementation manners of the present invention are given in detail by the following embodiments and their accompanying drawings. Description of the Drawings

[0030] The drawings described herein are used to provide a further understanding of the present invention and form a part of this application. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0031] Figure 1 FIG. is a schematic structural diagram of a tempering furnace conveying system and its usage method provided by an embodiment of the present invention;

[0032] Figure 2 FIG. is a front view of a tempering furnace conveying system and its usage method provided by an embodiment of the present invention;

[0033] Figure 3 FIG. is a schematic structural diagram of a water-cooling layer in a tempering furnace conveying system and its usage method provided by an embodiment of the present invention;

[0034] Figure 4 FIG. is a schematic structural diagram of a heat exchange cavity in a tempering furnace conveying system and its usage method provided by an embodiment of the present invention;

[0035] Figure 5 FIG. is a top view of a chain-driven roller conveyor in a tempering furnace conveying system and its usage method provided by an embodiment of the present invention;

[0036] Figure 6 FIG. is a schematic structural diagram of a cooling cavity in a tempering furnace conveying system and its usage method provided by an embodiment of the present invention.

[0037] In the drawings, the list of components represented by each reference numeral is as follows:

[0038] 1. Tempering furnace body; 2. Chain-driven roller conveyor; 3. Chiller; 4. Buried tube water-cooling plate; 5. Heat-resistant alloy roller; 6. Conveying layer; 7. Water-cooling layer; 8. Heat exchange cavity; 9. Water-cooling pipeline; 10. Outlet pipe; 11. Return pipe; 12. Circulation water pump; 13. Support frame; 14. Preheating cavity; 15. Heating cavity; 16. Cooling cavity; 17. Electric heating tube; 18. Centrifugal circulation fan; 19. Temperature sensor; 20. Infrared workpiece detector; 21. Tempering furnace PLC controller; 22. Waste heat recovery pump; 23. Cooling fan; 24. Exhaust pump; 25. Cooling air hood; 26. Waste heat recovery air hood; 27. Exhaust air hood; 28. Pressure relief valve. Detailed Embodiments

[0039] The following will describe the principles and features of the present invention in conjunction with the attached Figure 1-6 drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention. In the following paragraphs, the present invention will be described more specifically by way of example with reference to the accompanying drawings. According to the following description and the claims, the advantages and features of the present invention will be clearer. It should be noted that the drawings are all in a very simplified form and use non-precise scales, only for the purpose of facilitating and clearly assisting in explaining the purpose of the embodiments of the present invention.

[0040] It should be noted that when a component is referred to as being "fixed to" another component, it can be directly on the other component or there can also be an intermediate component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component at the same time. When a component is considered to be "disposed on" another component, it can be directly disposed on the other component or there may be an intermediate component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0042] As Figure 1-6 shown, the present invention provides a tempering furnace conveying system, which includes a tempering furnace body 1, a high-temperature resistant conveying mechanism, a heat circulation module, an intelligent control system, and a waste heat recovery module. The high-temperature resistant conveying mechanism includes a chain drive roller conveyor 2, a chiller 3, and a buried tube water-cooled plate 4. The chain drive roller conveyor 2 is evenly provided with heat-resistant alloy rollers 5. The chain drive roller conveyor 2 is driven by a frequency conversion motor. A conveying layer 6 and a water-cooled layer 7 are provided inside the chain drive roller conveyor 2. The buried tube water-cooled plate 4 is installed in the water-cooled layer 7. The conveying layer 6 is rotatably connected to the heat-resistant alloy rollers 5 through bearings. A heat exchange cavity 8 is provided on the inner wall of the heat-resistant alloy rollers 5. The buried tube water-cooled plate 4 is provided with a water-cooling pipeline 9. The water-cooling pipeline 9 is evenly and fixedly connected to a water outlet pipe 10 and a return pipe 11. The chiller 3 is fixedly connected to a circulating water pump 12. One end of the water-cooling pipeline 9 is connected to the circulating water pump 12, and the other end is connected to the return port of the chiller 3. The tempering furnace body 1 is fixedly connected to the chain drive roller conveyor 2. The tempering furnace body 1 is evenly provided with hydraulic lifting partition doors 13. The tempering furnace body 1 is partitioned into a preheating chamber 14, a heating chamber 15, and a cooling chamber 16 by the hydraulic lifting partition doors 13;

[0043] The thermal cycle module includes an electric heating tube 17 and a centrifugal circulation fan 18. The electric heating tube 17 is installed inside the tempering furnace body 1, and the centrifugal circulation fan 18 is installed at the heating chamber 15 of the tempering furnace body 1;

[0044] The intelligent control system includes a temperature sensor 19, an infrared workpiece detector 20, and a tempering furnace PLC controller 21. The temperature sensor 19 is evenly installed at the tempering furnace body 1, and the tempering furnace PLC controller 21 is installed on the tempering furnace body 1;

[0045] The waste heat recovery module includes a waste heat recovery pump 22, a cooling fan 23, an exhaust pump 24, a cooling air hood 25, a waste heat recovery air hood 26, and an exhaust air hood 27. The cooling air hood 25 and the waste heat recovery air hood 26 are both installed inside the cooling chamber 16, and the exhaust air hood 27 is installed inside the preheating chamber 14. Both ends of the waste heat recovery pump 22 are respectively communicated with the waste heat recovery air hood 26 and the exhaust air hood 27, and the cooling fan 23 and the exhaust pump 24 are communicated.

[0046] Preferably, the heat exchange chamber 8 is provided with an S-shaped cold water flow pipeline, and the water outlet pipe 10 and the return pipe 11 are respectively rotationally communicated with both ends of the heat exchange chamber 8 of the heat-resistant alloy roller 5 through sealed bearings.

[0047] Preferably, there are three groups of electric heating tubes 17, and the three groups of electric heating tubes 17 are respectively installed on both sides and the top of the inner wall of the heating chamber 15 of the tempering furnace body 1.

[0048] Preferably, there are three groups of temperature sensors 19, and the three groups of temperature sensors 19 are respectively installed in the preheating chamber 14, the heating chamber 15, and the cooling chamber 16 of the tempering furnace body 1. There are eight temperature sensors 19 in the heating chamber 15, and the eight temperature sensors 19 are respectively placed at the four corners of the upper side and the four corners of the lower side of the heating chamber 15.

[0049] Preferably, the tempering furnace PLC controller 21 is signal-connected to the chain drive roller conveyor 2, the hydraulic lifting partition door 13, the electric heating tube 17, the centrifugal circulation fan 18, the temperature sensor 19, the infrared workpiece detector 20, the waste heat recovery pump 22, the cooling fan 23, and the exhaust pump 24.

[0050] Preferably, there are three cooling air hoods 25. The two side cooling air hoods 25 are communicated with the cooling fan 23, the middle cooling air hood 25 is communicated with the exhaust pump 24, and the cooling chamber 16 is provided with a pressure relief valve 28.

[0051] The specific working principle and usage method of the present invention are as follows:

[0052] S1, System startup and initialization: Turn on the chiller 3, transfer water to the water-cooled pipeline 9 in the heat exchange chamber 8 through the circulating water pump 12. The cooling water evenly drains from the water outlet pipe 10 into the heat exchange chamber 8 of the heat-resistant alloy roller 5 and then discharges through the return pipe 11. The heat-resistant alloy roller 5 is rotationally connected to the water outlet pipe 10 and the return pipe 11 through a sealed bearing. The return pipe 11 returns to the chiller 3 through another section of the water-cooled pipeline 9 for recycling, ensuring that the temperature of the chain-driven roller conveyor 2 ≤ 60°C. Start the tempering furnace PLC controller 21, load the preset process recipe, material: 42CrMo steel, target temperature: 550°C, and set the heating temperature of the electric heating tube 17, thereby setting the tempering heating temperature of the heating chamber 15;

[0053] S2, Workpiece feeding and parameter setting: Place the workpiece at the position of the heat-resistant alloy roller 5 on the chain-driven roller conveyor 2. The infrared workpiece detector 20 can scan the size. Set in the tempering furnace PLC controller 21: the target temperature of the electric heating tube 17 is 550°C, the tempering heating time of the heating chamber 15: 90 minutes, and the maximum allowable temperature difference in the heating chamber 15: ±8°C;

[0054] S3, Workpiece heating stage: The tempering furnace PLC controller 21 calculates according to the workpiece heat load

[0055] (Q = ρ·C·V·△T) The initial conveying speed is 1.0 m / min, and the calculation formula is as follows;

[0056] The electric heating tube 17 is heated in stages to the target temperature, and the centrifugal circulating fan 18 is started for forced convection;

[0057] Detect the temperature of the heating chamber 15. If the temperature > the set value + 20°C, the tempering furnace PLC controller 21 automatically turns off the electric heating tube 17 and opens the hydraulic lift partition door 13, and controls the chain-driven roller conveyor 2 to take out the workpiece to prevent damage to the workpiece;

[0058] S4, Workpiece tempering stage: The chain-driven roller conveyor 2 transfers the workpiece into the heating chamber 15 through the heat-resistant alloy roller 5 for tempering heating. After the conveying is in place, start the hydraulic lift partition door 13 to drop and separate the preheating chamber 14, the heating chamber 15, and the cooling chamber 16 to reduce heat leakage. The temperature sensor 19 monitors the multi-point temperature in the furnace in real time, and the PID algorithm dynamically adjusts the heating power to maintain the temperature fluctuation ≤ ±5°C. If the detected temperature difference exceeds the limit, such as the temperature in a certain area > 550°C + 8°C,, increase the speed of the centrifugal circulating fan 18 to strengthen the circulation until the tempering heating time is reached;

[0059] S5, Cooling and Discharging: After tempering heating is completed, open the hydraulic lifting partition door 13. The chain-driven roller conveyor 2 moves the workpiece from the heating chamber 15 to the cooling chamber 16. Inside the cooling chamber 16, the temperature sensor 19 can detect the residual heat temperature. If the residual heat exhaust gas temperature is greater than 300 °C, start the waste heat recovery pump 22 to transfer the waste heat exhaust gas to the exhaust air hood 27, so that the waste heat exhaust gas can be transferred to the preheating chamber 14 for preheating the internal workpiece, reducing the initial heating energy consumption. When the temperature is ≤ 300 °C, start the cooling fan 23 and the exhaust pump 24. The cooling fan 23 can transfer the outer wall to the inside of the cooling chamber 16 through the two-side cooling air hoods 25 for air-cooling the internal workpiece. The exhaust pump 24 can extract air to accelerate the air-cooling efficiency. The air-cooling component cools the workpiece to below 80 °C.

[0060] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0061] The above is only a preferred embodiment of the present invention, and does not impose any form of limitation on the present invention; any ordinary technician in the industry can smoothly implement the present invention according to the illustrations in the specification and the above description; however, any equivalent changes, such as slight modifications, decorations, and evolutions made by those skilled in the art without departing from the technical solution of the present invention and using the technical content disclosed above, are equivalent embodiments of the present invention; at the same time, any equivalent changes, such as modifications and evolutions made to the above embodiments based on the essential technology of the present invention, still fall within the protection scope of the technical solution of the present invention.

Claims

1. A tempering furnace conveying system, comprising a tempering furnace body (1), a high-temperature resistant conveying mechanism, a heat circulation module, an intelligent control system, and a waste heat recovery module, characterized in that: The high-temperature resistant conveying mechanism includes a chain-driven roller conveyor (2), a chiller (3), and a buried tube water-cooled plate (4). The chain-driven roller conveyor (2) is evenly provided with heat-resistant alloy rollers (5). The chain-driven roller conveyor (2) is driven by a frequency conversion motor. A conveying layer (6) and a water-cooled layer (7) are arranged inside the chain-driven roller conveyor (2). The buried tube water-cooled plate (4) is installed in the water-cooled layer (7). The conveying layer (6) is rotationally connected to the heat-resistant alloy rollers (5) through bearings. An exchange cavity (8) is arranged on the inner wall of the heat-resistant alloy rollers (5). The buried tube water-cooled plate (4) is provided with a water-cooling pipeline (9). The water-cooling pipeline (9) is evenly and fixedly communicated with a water outlet pipe (10) and a return pipe (11). The chiller (3) is fixedly communicated with a circulating water pump (12). One end of the water-cooling pipeline (9) is communicated with the circulating water pump (12), and the other end is communicated with the return port of the chiller (3). The tempering furnace body (1) is fixedly connected to the chain-driven roller conveyor (2). The tempering furnace body (1) is evenly provided with hydraulic lifting partition doors (13). The tempering furnace body (1) is divided into a preheating cavity (14), a heating cavity (15), and a cooling cavity (16) by the hydraulic lifting partition doors (13). The heat circulation module includes electric heating tubes (17) and a centrifugal circulating fan (18). The electric heating tubes (17) are installed inside the tempering furnace body (1). The centrifugal circulating fan (18) is installed at the heating cavity (15) of the tempering furnace body (1). The intelligent control system includes a temperature sensor (19), an infrared workpiece detector (20), and a tempering furnace PLC controller (21). The temperature sensors (19) are evenly installed on the tempering furnace body (1). The tempering furnace PLC controller (21) is installed on the tempering furnace body (1). The waste heat recovery module includes a waste heat recovery pump (22), a cooling fan (23), an exhaust pump (24), a cooling air hood (25), a waste heat recovery air hood (26), and an exhaust air hood (27). The cooling air hood (25) and the waste heat recovery air hood (26) are both installed in the cooling cavity (16). The exhaust air hood (27) is installed in the preheating cavity (14). Both ends of the waste heat recovery pump (22) are communicated with the waste heat recovery air hood (26) and the exhaust air hood (27) respectively. The cooling fan (23) and the exhaust pump (24) are communicated; The usage method includes the following steps: S1, System startup and initialization: Turn on the chiller (3), transfer water to the water-cooled pipeline (9) in the heat exchange chamber (8) through the circulating water pump (12). The cooling water is evenly discharged from the water outlet pipe (10) into the heat exchange chamber (8) of the heat-resistant alloy roller (5) and then discharged through the return pipe (11). The heat-resistant alloy roller (5) is rotationally connected to the water outlet pipe (10) and the return pipe (11) through a sealed bearing. The return pipe (11) returns to the chiller (3) through another section of the water-cooled pipeline (9) for recycling, ensuring that the temperature of the chain-driven roller conveyor (2) ≤ 60°C. Start the tempering furnace PLC controller (21), load the preset process recipe (such as material: 42CrMo steel, target temperature: 550°C), and set the heating temperature of the electric heating tube (17), thereby setting the tempering heating temperature of the heating chamber (15); S2, Workpiece feeding and parameter setting: Place the workpiece at the position of the heat-resistant alloy roller (5) of the chain-driven roller conveyor (2). The infrared workpiece detector (20) can scan the size. Set in the tempering furnace PLC controller (21): the target temperature of the electric heating tube (17) (such as 550°C), the tempering heating time of the heating chamber (15) (such as 90 minutes), and the maximum allowable temperature difference in the heating chamber (15) (such as ±8°C); S3, Workpiece heating stage: The tempering furnace PLC controller (21) calculates the initial conveying speed (such as 1.0 m / min) according to the workpiece heat load, and the calculation formula is as follows; (Q = ρ·C·V·ΔT) The electric heating tube (17) is heated to the target temperature in stages, and the centrifugal circulating fan (18) is started for forced convection; S4, Workpiece tempering stage: The chain-driven roller conveyor (2) transfers the workpiece into the heating chamber (15) through the heat-resistant alloy roller (5) for tempering heating. After the conveying is in place, start the hydraulic lifting partition door (13) to drop and separate the preheating chamber (14), the heating chamber (15), and the cooling chamber (16) to reduce heat leakage. The temperature sensor (19) monitors the temperature at multiple points in the furnace in real time, and the PID algorithm dynamically adjusts the heating power to maintain the temperature fluctuation ≤ ±5°C. If the detected temperature difference exceeds the limit (such as the temperature in a certain area > 550°C + 8°C), increase the fan speed to strengthen the circulation until the tempering heating time is reached; S5, Cooling and Discharging: After tempering heating is completed, the hydraulic lift partition door (13) is opened, and the chain-driven roller conveyor (2) moves the workpiece from the heating chamber (15) to the cooling chamber (16). Inside the cooling chamber (16), the temperature sensor (19) can detect the residual heat temperature. If the residual heat exhaust gas temperature is greater than > 300 °C, starting the waste heat recovery pump (22) can transfer the waste heat exhaust gas to the exhaust air hood (27), so that the waste heat exhaust gas can be transferred to the preheating chamber (14) to preheat the internal workpiece, reducing the initial heating energy consumption. When the temperature ≤ 300 °C, the cooling fan (23) and the exhaust pump (24) are started. The cooling fan (23) can transfer the outer wall to the inside of the cooling chamber (16) through the two side cooling air hoods (25) to air-cool the internal workpiece, and the exhaust pump (24) can extract air to accelerate the air-cooling efficiency. The air-cooling component cools the workpiece to below 80 °C.

2. The tempering furnace conveying system according to claim 1, characterized in that, In S3, the temperature of the heating chamber (15) is detected. If the temperature > the set value + 20 °C, the tempering furnace PLC controller (21) automatically closes the electric heating tube (17) and opens the hydraulic lift partition door (13), and controls the chain-driven roller conveyor (2) to take out the workpiece to prevent damage to the workpiece.

3. The tempering furnace conveying system according to claim 1, wherein The heat exchange chamber (8) is provided with an S-shaped cold water circulation pipeline, and the water outlet pipe (10) and the return pipe (11) are respectively rotationally connected to both ends of the heat exchange chamber (8) of the heat-resistant alloy roller (5) through sealed bearings.

4. The tempering furnace conveying system according to claim 1, characterized in that, There are three groups of the electric heating tubes (17), and the three groups of the electric heating tubes (17) are respectively installed on both sides and the top of the inner wall of the heating chamber (15) of the tempering furnace body (1).

5. The tempering furnace conveying system according to claim 1, characterized in that There are three groups of the temperature sensors (19), and the three groups of the temperature sensors (19) are respectively installed in the preheating chamber (14), the heating chamber (15), and the cooling chamber (16) of the tempering furnace body (1). There are eight temperature sensors (19) in the heating chamber (15), and the eight temperature sensors (19) are respectively placed at the four corners on the upper side and the four corners on the lower side of the heating chamber (15).

6. The tempering furnace conveying system according to claim 1, wherein, The tempering furnace PLC controller (21) is signal-connected to the chain-driven roller conveyor (2), the hydraulic lift partition door (13), the electric heating tube (17), the centrifugal circulating fan (18), the temperature sensor (19), the infrared workpiece detector (20), the waste heat recovery pump (22), the cooling fan (23), and the exhaust pump (24).

7. The tempering furnace conveying system according to claim 1, wherein, There are three cooling air hoods (25). The two side cooling air hoods (25) are connected to the cooling fan (23), and the middle cooling air hood (25) is connected to the exhaust pump (24). The cooling chamber (16) is provided with a pressure relief valve (28).

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