A lengthened bolt heat treatment mesh belt furnace

Abstract

The application relates to the technical field of bolt heat treatment equipment, and discloses a lengthened bolt heat treatment mesh belt furnace which comprises a heating furnace main body, a quenching pool, an air drying box and a regenerative furnace main body. The lengthened bolt heat treatment mesh belt furnace is characterized in that: when the regenerative furnace main body generates flue gas which is discharged from the heat-conducting flue pipe, the second spiral flow guide plate can prolong the flow time of the heat-conducting medium, so that the heat-conducting medium can fully absorb the heat of the flue gas; then, the heat of the heat-conducting plate is radiated through the heat dissipation fins, and the internal space of the heating furnace main body is assisted in heating, so that the direct discharge of heat can be avoided, a large amount of heat energy can be prevented from being wasted, the energy-saving effect of the equipment can be achieved, the heat of the flue gas in the heat-conducting flue pipe is reduced by the heat absorption assembly, the heat pollution caused by the discharge of the flue gas can be avoided, and the energy-saving and environmental protection performance of the equipment is further improved.

Description

Technical Field

[0001] This application relates to the technical field of bolt heat treatment equipment, specifically an extended bolt heat treatment mesh belt furnace. Background Technology

[0002] Mesh belt furnaces, as core equipment for continuous heat treatment, sequentially complete processes such as heating, quenching, and tempering by conveying workpieces via a mesh belt. They are widely used in the mass production of bolts, especially extended bolts. Due to their large length and high strength requirements, extended bolts require sufficient cooling and hardening time in the quenching section, while stress relief and performance stabilization are achieved in the tempering section.

[0003] An existing patent (publication number: CN210711654U) discloses an extended bolt heat treatment mesh belt furnace. The extended bolt heat treatment mesh belt furnace includes a heating section, a quenching section, a quick-drying section, and a tempering section. The heating section includes a furnace body, a furnace inlet, a furnace conveyor belt, and a furnace outlet. The furnace outlet extends downwards at an angle into the quenching medium of the quenching section. This solution can increase the residence time of products in the quenching and tempering sections per unit speed, improve the overall load-bearing capacity of the production line, reduce the cost of high-strength bolt heat treatment, and increase unit output.

[0004] However, the high-temperature heat in the tempering furnace in the above scheme is not recycled or reused. Most of the heat is directly discharged from the furnace with the exhaust gas. This direct heat discharge results in a large amount of heat energy being wasted. This not only keeps the energy consumption during equipment operation high and increases the production cost of bolt heat treatment, but also releases a large amount of waste heat into the surrounding environment, causing thermal pollution. This results in insufficient energy conservation and environmental protection, and does not meet the current requirements for energy conservation, emission reduction, green and low-carbon development in industrial production. Utility Model Content

[0005] To address the shortcomings of existing technologies, this application provides an extended bolt heat treatment mesh belt furnace. Through the combined action of an auxiliary preheating component, a heat-conducting flue, and a heat-absorbing component, the heated heat-conducting medium can be transported to the interior of the auxiliary preheating component. Subsequently, the auxiliary preheating component provides auxiliary heating to the internal space of the furnace body. This avoids the direct emission of heat, which would otherwise result in a large waste of thermal energy, thus achieving energy-saving effects and solving the problems mentioned in the background technology.

[0006] To achieve the above objectives, this application provides the following technical solution: an extended bolt heat treatment mesh belt furnace, comprising a heating furnace body, a quenching tank, an air drying box, and a reheating furnace body, wherein the heating furnace body, quenching tank, air drying box, and reheating furnace body are arranged sequentially from right to left. An auxiliary preheating assembly is disposed inside the heating furnace body. The auxiliary preheating assembly includes two heat-conducting plates fixedly connected to the inner side of the heating furnace body. Multiple equidistantly arranged heat dissipation fins are fixedly connected to the side of the two heat-conducting plates that are close to each other. Flow cavities are formed on the inner side of each of the two heat dissipation fins. A flow divider is fixedly connected to the upper side of the heating furnace body. Conveyors are fixedly installed on both sides of the flow divider. A feed pipe is provided, with one end of the feed pipe fixedly connected to the inner wall of the flow chamber. The other ends of the two sets of flow chambers are fixedly connected to return branch pipes. A return main pipe is fixedly connected to the outer side of the return branch pipe. A heat-conducting flue is fixedly installed on the outer side of the regenerating furnace body. A first spiral guide plate is fixedly connected to the inner side of the heat-conducting flue. A heat-absorbing assembly is provided on the outer side of the heat-conducting flue. The heat-absorbing assembly includes a heat insulation box fixedly connected to the outer side of the heat-conducting flue. A second spiral guide plate is fixedly connected to the inner side of the heat insulation box, and the inner side of the second spiral guide plate is fixedly connected to the outer side of the heat-conducting flue. An injection pipe is fixedly connected to the outer side of the heat insulation box, and the other end of the injection pipe is fixedly connected to the input end of the distributor.

[0007] Through the above scheme, by utilizing the combined action of the auxiliary preheating component, the heat-conducting flue, and the heat-absorbing component, the high-temperature heat generated during the operation of the regenerating furnace can be discharged through the heat-conducting flue. At this time, the heat-absorbing component can absorb the heat generated by the flue gas, and the absorbed heat is transported to the auxiliary preheating component, thereby preheating the space of the furnace body. This provides heat support for the subsequent preheating of bolts, realizing the recovery and recycling of the high-temperature heat of the regenerating furnace body, avoiding the waste caused by direct heat emission, reducing the energy consumption of the furnace body, reducing thermal pollution, and thus improving the energy efficiency and environmental protection of the equipment.

[0008] Furthermore, the flow cavity is designed in a continuous S-shape.

[0009] By utilizing the continuous S-shaped structure of the flow cavity, the flow time of the heat transfer medium within the flow cavity can be extended, thereby increasing the heat exchange time between the heat transfer medium and the heat transfer plate and further improving the heat transfer efficiency.

[0010] Furthermore, a heat insulation cover is fitted on the outer side of each of the two heat-conducting plates, and the outer side of the heat insulation cover is fixedly connected to the outer side of the heating furnace body.

[0011] The above solution utilizes the heat insulation cover to protect the heat-conducting plate from heat loss, ensuring the preheating effect of the auxiliary preheating components and improving heat utilization.

[0012] Furthermore, a liquid storage tank is provided on the outside of the main body of the regenerating furnace, and the other end of the reflux main pipe is fixedly connected to the inside of the liquid storage tank. A water pump is fixedly embedded on the outside of the liquid storage tank, and the output end of the water pump is fixedly connected to a connecting pipe, and the other end of the connecting pipe is fixedly connected to the inside of the insulation box.

[0013] Through the above scheme, by utilizing the combined action of the liquid storage tank, water pump and return main pipe, the circulation of the heat transfer medium can be realized, ensuring continuous heat transfer of the heat transfer medium and stably recovering the heat from the main body of the regenerating furnace to the main body of the heating furnace.

[0014] Furthermore, a heating furnace conveyor belt is fixedly installed on the inner side of the heating furnace body, a heater is fixedly installed on the inner side of the heating furnace body, a quenching conveyor belt is fixedly installed on the inner side of the quenching pool and the drying box, and a regenerating furnace conveyor belt is fixedly installed on the inner side of the regenerating furnace body.

[0015] By utilizing the above scheme and the combined action of the heating furnace conveyor belt, heater, quenching conveyor belt, and reheating conveyor belt, continuous conveying of bolt processing can be achieved. This ensures heat recovery and utilization without affecting the bolt processing flow.

[0016] Furthermore, multiple U-shaped air ducts arranged at equal intervals are fixedly installed on the inner side of the drying box, and multiple high-pressure jet heads are fixedly installed on the outer side of each U-shaped air duct.

[0017] The above method utilizes the combined action of a U-shaped air duct and a high-pressure jet nozzle to blow air onto quenched bolts, effectively removing residual quenching medium from the bolt surface and preventing the residual medium from affecting the subsequent tempering quality.

[0018] Furthermore, a high-pressure air pump is fixedly installed on the inner side of the drying box, and a diverter pipe is fixedly installed at the output end of the high-pressure air pump. The outer side of the diverter pipe is fixedly installed on the outer side of the U-shaped air duct, and the inner wall of the diverter pipe is connected to the inner wall of the U-shaped air duct.

[0019] By utilizing the above scheme and the combined action of the high-pressure air pump and the diversion pipe, high-pressure gas can be stably delivered to the U-shaped air duct, ensuring the blowing intensity and uniformity of the high-pressure jet head, and further improving the efficiency of cleaning the medium on the bolt surface.

[0020] Furthermore, an air inlet pipe is fixedly connected to the top surface of the drying box, the suction end of the high-pressure air pump is located inside the air inlet pipe, and a filter plate is fixedly connected to the inside of the air inlet pipe.

[0021] By utilizing the above solution and the combined action of the air inlet pipe and the filter plate, the gas drawn in by the high-pressure air pump can be filtered, preventing impurities from clogging the high-pressure jet head, ensuring the stable operation of the bolt drying process, and improving the reliability of equipment operation.

[0022] Compared with the prior art, the technical solution of this application has the following beneficial effects: This extended bolt heat treatment mesh belt furnace, through the combined action of an auxiliary preheating component, a heat-conducting flue, and a heat-absorbing component, utilizes the combined action of a first spiral guide plate and a second spiral guide plate. The first spiral guide plate extends the flow time of the flue gas in the heat-conducting flue, and the second spiral guide plate extends the flow time of the heat-conducting medium. This allows the heat-conducting medium to fully absorb the heat from the flue gas. Then, using an injection pipe, the heated heat-conducting medium is transported to the interior of the auxiliary preheating component. Subsequently, through the combined action of the heat-conducting plate, heat dissipation fins, flow cavity, distributor, and conveying pipe, the heated heat-conducting medium is transported to the interior of the flow cavity through the injection pipe, thereby heating the heat-conducting plate. The heat from the heat-conducting plate is then dissipated by the heat dissipation fins to provide auxiliary heating to the interior space of the furnace body. This avoids the waste of a large amount of heat energy due to direct heat emission, achieving energy-saving effects. At the same time, the heat-absorbing component reduces the heat of the flue gas in the heat-conducting flue, preventing thermal pollution during emission and further improving the energy efficiency and environmental friendliness of the equipment. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram of the entire application; Figure 2 This is a cross-sectional view of the overall structure of this application; Figure 3 This is a diagram showing the internal structure of the auxiliary preheating component in this application; Figure 4 This is a diagram showing the internal structure of the heat-conducting plate in this application; Figure 5 This is a diagram showing the internal structure of the heat-conducting flue and heat-absorbing components of this application.

[0024] In the picture: 1. Heating furnace body; 101. Heating furnace conveyor belt; 102. Heater; 2. Quenching tank; 201. Quenching conveyor belt; 3. Drying box; 4. Regenerating furnace body; 401. Regenerating furnace conveyor belt; 5. Auxiliary preheating components; 501. Heat-conducting plate; 502. Heat dissipation fins; 503. Flow chamber; 504. Diverter; 505. Conveying pipe; 506. Heat insulation cover; 507. Return branch pipe; 508. Return main pipe; 6. Heat-conducting flue; 601. First spiral guide plate; 7. Heat absorption component; 701. Heat insulation box; 702. Second spiral guide plate; 703. Injection pipe; 8. U-shaped air duct; 9. High-pressure jet nozzle; 10. Diverter pipe; 11. High-pressure air pump; 12. Air inlet pipe; 13. Filter plate; 14. Water pump; 15. Connecting pipe; 16. Liquid storage tank. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] Please see Figure 1 and Figure 2 This embodiment of an extended bolt heat treatment mesh belt furnace includes a heating furnace body 1, a quenching tank 2, a drying box 3, and a reheating furnace body 4. The heating furnace body 1, quenching tank 2, drying box 3, and reheating furnace body 4 are arranged sequentially from right to left. An auxiliary preheating component 5 is installed inside the heating furnace body 1. A heating furnace conveyor belt 101 and a heater 102 are fixedly installed inside the heating furnace body 1. Quenching conveyor belts 201 and 201 are fixedly installed inside the quenching tank 2 and drying box 3. A reheating furnace conveyor belt 401 is fixedly installed inside the reheating furnace body 4. By utilizing the combined action of the heating furnace conveyor belt 101, heater 102, quenching conveyor belt 201, and reheating conveyor belt 401, continuous conveying of bolt processing can be achieved. This ensures heat recovery and utilization without affecting the bolt processing flow.

[0027] Please see Figure 1 , Figure 3 and Figure 4The auxiliary preheating component 5 includes two heat-conducting plates 501 fixedly connected to the inner side of the furnace body 1. Multiple equidistantly arranged heat dissipation fins 502 are fixedly connected to the side of each heat-conducting plate 501 that is close to each other. Flow chambers 503 are formed on the inner side of each of the two heat dissipation fins 502. A flow divider 504 is fixedly connected to the upper side of the furnace body 1. Delivery pipes 505 are fixedly installed on both sides of the flow divider 504, and the other end of each delivery pipe 505 is fixedly connected to the inner wall of the flow chamber 503. Return branch pipes 507 are fixedly connected to the other ends of the two sets of flow chambers 503. A return main pipe 508 is fixedly connected to the outer side of each return branch pipe 507. Utilizing the combined action of the heat-conducting plates 501, heat dissipation fins 502, flow chambers 503, flow divider 504, and delivery pipes 505, the heated heat transfer medium is delivered to the flow chambers 503 through the injection pipe 703. The heat is then transferred to the interior of the furnace body 1, whereby the heat transfer plate 501 is heated. The heat from the heat transfer plate 501 is then dissipated through the heat dissipation fins 502 to further heat the interior space of the furnace body 1. This avoids direct heat dissipation and the resulting waste of heat energy, achieving energy-saving effects. The flow cavity 503 is designed in a continuous S-shape. This continuous S-shape extends the flow time of the heat transfer medium within the flow cavity 503, thereby increasing the heat exchange time between the heat transfer medium and the heat transfer plate 501 and further improving heat transfer efficiency. Both heat transfer plates 501 are fitted with heat insulation covers 506, which are fixedly connected to the outside of the furnace body 1. These heat insulation covers 506 provide insulation protection for the heat transfer plates 501, preventing heat loss and ensuring the preheating effect of the auxiliary preheating component 5, thus improving heat utilization. Please see Figure 1 and Figure 5A heat-conducting flue 6 is fixedly installed on the outer side of the regenerating furnace body 4. A first spiral guide plate 601 is fixedly connected to the inner side of the heat-conducting flue 6. A heat-absorbing component 7 is provided on the outer side of the heat-conducting flue 6. The heat-absorbing component 7 includes a heat insulation box 701 fixedly connected to the outer side of the heat-conducting flue 6. A second spiral guide plate 702 is fixedly connected to the inner side of the heat insulation box 701. Utilizing the functions of the first spiral guide plate 601 and the second spiral guide plate 702, the first spiral guide plate 601 can prolong the flow time of the flue gas in the heat-conducting flue 6, and the second spiral guide plate 702 can prolong the flow time of the heat-conducting medium. This allows the heat-conducting medium to fully absorb the heat of the flue gas. The inner side of the second spiral guide plate 702 is fixedly connected to the outer side of the heat-conducting flue 6, and an injection pipe is fixedly connected to the outer side of the heat insulation box 701. 703, and the other end of the injection pipe 703 is fixedly connected to the input end of the distributor 504. The above-mentioned heat absorption component 7 reduces the heat of the flue gas in the heat conduction flue pipe 6, so that it avoids thermal pollution when it is discharged again, and further improves the energy saving and environmental protection of the equipment. A liquid storage tank 16 is provided on the outside of the regenerating furnace body 4. The other end of the return pipe 508 is fixedly connected to the inside of the liquid storage tank 16. A water pump 14 is fixedly embedded on the outside of the liquid storage tank 16. The output end of the water pump 14 is fixedly connected to a connecting pipe 15, and the other end of the connecting pipe 15 is fixedly connected to the inside of the heat insulation box 701. By utilizing the cooperation of the liquid storage tank 16, the water pump 14 and the return pipe 508, the circulation of the heat conduction medium can be realized, ensuring the continuous heat conduction of the heat conduction medium and stably recovering the heat of the regenerating furnace body 4 to the heating furnace body 1.

[0028] Please see Figure 1 and Figure 2 The drying box 3 has multiple U-shaped air ducts 8 fixedly installed on its inner side, arranged at equal intervals. Each U-shaped air duct 8 has multiple high-pressure jet nozzles 9 fixedly installed on its outer side. Utilizing the combined action of the U-shaped air ducts 8 and the high-pressure jet nozzles 9, the quenched bolts can be blown through, effectively removing residual quenching medium from the bolt surface and preventing residual medium from affecting the subsequent tempering quality. A high-pressure air pump 11 is fixedly installed on the inner side of the drying box 3. A diverter pipe 10 is fixedly installed at the output end of the high-pressure air pump 11, and the outer side of the diverter pipe 10 is fixedly installed on the outer side of the U-shaped air ducts 8. The inner wall of the diverter pipe 10 is connected to the inner wall of the U-shaped air ducts 8. The high-pressure air pump 11, in conjunction with the diverter pipe 10, can stably deliver high-pressure gas to the U-shaped air duct 8, ensuring the blowing intensity and uniformity of the high-pressure jet nozzle 9, and further improving the cleaning efficiency of the medium on the bolt surface. The top surface of the drying box 3 is fixedly connected to the air inlet pipe 12, and the suction end of the high-pressure air pump 11 is located inside the air inlet pipe 12. The inner side of the air inlet pipe 12 is fixedly connected to the filter plate 13. By utilizing the cooperation between the air inlet pipe 12 and the filter plate 13, the gas sucked in by the high-pressure air pump 11 can be filtered to prevent impurities from clogging the high-pressure jet nozzle 9, ensuring the stable operation of the bolt drying process and improving the reliability of equipment operation.

[0029] The working principle of the above embodiment is as follows: When the equipment is running, firstly, the high-temperature heat generated by the regenerating furnace body 4 during the tempering process is discharged to the outside through the heat-conducting flue pipe 6. At this time, the first spiral guide plate 601 extends the flow path of the flue gas, allowing the heat to be fully dissipated into the outer insulation box 701. Then, the heat-conducting medium in the storage tank 16 is transported to the insulation box 701 through the connecting pipe 15 under the drive of the water pump 14. At this time, the second spiral guide plate 702 can extend the flow path of the heat-conducting medium, thereby improving the efficiency of heat dissipation. The increased contact time between the heat-conducting medium and the heat-conducting flue 6 allows the heat-conducting medium to fully absorb heat. After absorbing heat, the heat-conducting medium is then transported through the injection pipe 703 to the distributor 504. From there, it is guided through the distributor 504 and the two side delivery pipes 505 into the flow cavities 503 of the two heat-conducting plates 501. The continuous S-shaped structure of the flow cavities 503 prolongs the flow time of the medium, ensuring that the heat-absorbing medium can fully transfer heat to the heat-conducting plates 501. The heat is then transferred into the interior of the heat-conducting plates 501. The heat released by the bolts, through the evaporation of the bolt body and the heat dissipation fins 502, is transported to the interior of the heating furnace body 1 to preheat the bolts for subsequent heating treatment. After releasing heat, the heat transfer medium is collected in the return main pipe 508 through the return branch pipe 507 and then flows back to the storage tank 16 to complete the circulation. Finally, while the heat is circulating, the bolts enter the heating furnace body 1 via the heating furnace conveyor belt 101. After being heated by the auxiliary preheating component 5 and the heater 102, they enter the quenching tank 2 via the quenching conveyor belt 201 for quenching treatment. After that, they enter the drying box 3 for medium removal. At this time, the high-pressure air pump 11 draws in air through the air inlet pipe 12. After being filtered by the filter plate 13, the surface impurities enter the high-pressure air pump 11 for cleaning. Then, the airflow is stably delivered to the U-shaped air duct 8 through the diversion pipe 10. Then, multiple high-pressure jet nozzles 9 blow air onto the surface of the bolts, thereby efficiently removing residual quenching medium. Finally, the bolts enter the reheating furnace body 4 via the reheating conveyor belt 401 to complete the tempering treatment.

[0030] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0031] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An extended bolt heat treatment mesh belt furnace, comprising a heating furnace body (1), a quenching tank (2), an air drying box (3), and a reheating furnace body (4), characterized in that: The heating furnace body (1), quenching tank (2), air drying box (3), and reheating furnace body (4) are arranged sequentially from right to left. An auxiliary preheating assembly (5) is provided inside the heating furnace body (1). The auxiliary preheating assembly (5) includes two heat-conducting plates (501) fixedly connected to the inner side of the heating furnace body (1). Multiple equidistant heat dissipation fins (502) are fixedly connected to the side of the two heat-conducting plates (501) that are close to each other. Flow chambers (503) are opened on the inner side of the two heat dissipation fins (502). A flow divider (504) is fixedly connected to the upper side of the heating furnace body (1). On the outer side of the flow divider (504), conveying pipes (505) are fixedly installed on both sides of the flow divider (504). The other end of the conveying pipe (505) is fixedly connected to the inner wall of the flow chamber (503). The two sets of flow chambers ( The other end of 503 is fixedly connected to a return branch pipe (507), the outer side of the return branch pipe (507) is fixedly connected to a return main pipe (508), the outer side of the regenerating furnace body (4) is fixedly installed with a heat-conducting flue (6), the inner side of the heat-conducting flue (6) is fixedly connected to a first spiral guide plate (601), the outer side of the heat-conducting flue (6) is provided with a heat-absorbing component (7), the heat-absorbing component (7) includes a heat insulation box (701) fixedly connected to the outer side of the heat-conducting flue (6), the inner side of the heat insulation box (701) is fixedly connected to a second spiral guide plate (702), and the inner side of the second spiral guide plate (702) is fixedly connected to the outer side of the heat-conducting flue (6), the outer side of the heat insulation box (701) is fixedly connected to an injection pipe (703), and the other end of the injection pipe (703) is fixedly connected to the input end of the distributor (504).

2. The extended bolt heat treatment mesh belt furnace according to claim 1, characterized in that: The flow cavity (503) is designed in a continuous S-shape.

3. The extended bolt heat treatment mesh belt furnace according to claim 1, characterized in that: The outer sides of the two heat-conducting plates (501) are fitted with heat insulation covers (506), and the outer sides of the heat insulation covers (506) are fixedly connected to the outer side of the heating furnace body (1).

4. The extended bolt heat treatment mesh belt furnace according to claim 1, characterized in that: A liquid storage tank (16) is provided on the outside of the main body (4) of the regenerating furnace. The other end of the reflux main pipe (508) is fixedly connected to the inside of the liquid storage tank (16). A water pump (14) is fixedly embedded on the outside of the liquid storage tank (16). The output end of the water pump (14) is fixedly connected to a connecting pipe (15), and the other end of the connecting pipe (15) is fixedly connected to the inside of the heat insulation box (701).

5. The extended bolt heat treatment mesh belt furnace according to claim 1, characterized in that: A heating furnace conveyor belt (101) is fixedly installed on the inner side of the heating furnace body (1), a heater (102) is fixedly installed on the inner side of the heating furnace body (1), a quenching conveyor belt (201) is fixedly installed on the inner side of the quenching pool (2) and the drying box (3), and a regenerating furnace conveyor belt (401) is fixedly installed on the inner side of the regenerating furnace body (4).

6. The extended bolt heat treatment mesh belt furnace according to claim 1, characterized in that: The drying box (3) has multiple U-shaped air ducts (8) arranged at equal intervals fixedly installed on its inner side, and multiple high-pressure jet heads (9) are fixedly installed on the outer side of each U-shaped air duct (8).

7. The extended bolt heat treatment mesh belt furnace according to claim 6, characterized in that: A high-pressure air pump (11) is fixedly installed on the inner side of the air drying box (3). A diverter pipe (10) is fixedly installed at the output end of the high-pressure air pump (11). The outer side of the diverter pipe (10) is fixedly installed on the outer side of the U-shaped air duct (8). The inner wall of the diverter pipe (10) is connected to the inner wall of the U-shaped air duct (8).

8. The extended bolt heat treatment mesh belt furnace according to claim 7, characterized in that: The top surface of the drying box (3) is fixedly connected to an air inlet pipe (12), the suction end of the high-pressure air pump (11) is located inside the air inlet pipe (12), and a filter plate (13) is fixedly connected to the inside of the air inlet pipe (12).

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