Heating furnace and air flow type cut tobacco dryer

Abstract

The embodiment of the application discloses a heating furnace and an airflow type cut tobacco dryer. The heating furnace comprises a machine body and a plurality of heating units. A plurality of plug-in interfaces are formed on the machine body. The heating unit comprises a control part and a heating part. The plug-in interface of the machine body is matched with the plug-in interface of the heating unit. The control part is detachably connected. The heating unit is convenient to disassemble and assemble. When a single unit fails, the whole machine does not need to stop. Only the failed unit needs to be disassembled, repaired or replaced. The equipment downtime is greatly reduced, and the operation stability is improved. In terms of temperature control accuracy and flexibility, each heating unit is independently provided with a control part. Single unit or multi-unit partition control is supported. The heating intensity of each area can be accurately adjusted according to the gas heating demand. Local overheating or insufficient heating is avoided. The heating uniformity and accuracy are improved. At the same time, the modular design of the heating unit also provides convenience for subsequent increase or decrease of the number of heating units according to actual working conditions, and enhances the applicability of the equipment.

Description

Technical Field

[0001] This application relates to the field of tobacco technology, and more particularly to a heating furnace and an airflow drying machine. Background Technology

[0002] In the tobacco processing industry, the drying process is a core element determining the final quality of tobacco shreds (such as moisture content, filling value, and sensory flavor). Airflow drying machines have become the mainstream drying equipment in the industry due to their advantages such as high heat exchange efficiency, uniform heating of tobacco shreds, and strong processing adaptability. The stable operation of this equipment highly depends on a continuous and controllable heat source supply. Its core function is to heat the process gas through a heat source, and then the hot airflow exchanges heat and mass with the tobacco shreds to achieve precise drying and quality improvement. Currently, the vast majority of airflow drying machines in China rely on gas-fired or oil-fired hot air boilers for their heat source supply. While these boilers can provide the heat required for the process, they require external gas or oil pipelines and exhaust pipes, and temperature regulation cannot be responded to quickly. Utility Model Content

[0003] The present invention introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. This part of the present invention is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0004] This utility model aims to solve at least one of the technical problems existing in the prior art or related technologies.

[0005] Therefore, the first aspect of this utility model provides a heating furnace.

[0006] The second aspect of this utility model provides an airflow-type wire drying machine.

[0007] In view of this, a heating furnace is provided according to a first aspect of the embodiments of this application, comprising: The body has an air inlet at one end and an air outlet at the other end, and has multiple connectors along its length. Multiple heating units, with one heating unit inserted into each of the aforementioned interfaces; The heating unit includes a control unit and a heating unit, the heating unit being connected to the control unit and disposed within the machine body, and the control unit being detachably connected to the machine body.

[0008] In one possible implementation, the heating element includes a plurality of heating tubes arranged at intervals.

[0009] In one feasible implementation, the control unit includes: The housing has multiple fixing holes formed on its periphery, and the housing is detachably connected to the body through the multiple fixing holes; The controller is disposed within the housing; The heating tubes are all connected to the housing.

[0010] In one feasible implementation, the heating section further includes flow guide fins connected to the outer wall of the heating tube.

[0011] In one feasible implementation, the heating furnace further includes a pressure detection element connected to the body for acquiring the pressure difference between the air inlet and the air outlet.

[0012] In one possible implementation, the heating furnace further includes a hoisting component arranged on top of the machine body.

[0013] In one feasible implementation, the body includes: Multiple housings, each housing having a socket, the multiple housings being detachably connected.

[0014] In one feasible implementation, the heating furnace further includes: A drain pipe, which connects to a low-lying area of ​​the body; A control valve is provided on the drain pipe.

[0015] In one feasible implementation, the heating furnace further includes: A heat insulation layer is disposed on the inner wall of the body; An observation window is provided on the side wall of the body.

[0016] According to a second aspect of the embodiments of this application, an airflow-type yarn drying machine is provided, comprising: The heating furnace as described in any of the above technical solutions; The main body of the wire drying machine includes a return air duct and a drying duct. The return air duct is connected to the air inlet of the heating furnace, and the drying duct is connected to the air outlet of the heating furnace.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects: The heating furnace provided in this embodiment includes a body and multiple heating units. Multiple connectors are formed on the body. Each heating unit includes a control unit and a heating element. When the heating furnace is started, external gas to be heated enters the internal cavity of the furnace through an air inlet at one end of the body. Multiple connectors along the length of the body are pre-connected to the heating units. The heating element of each heating unit is located inside the furnace, while the control unit is detachably connected to the outside of the body. At this time, the control units of each heating unit operate independently, adjusting the working state (such as start / stop, heating power) of the corresponding heating element according to requirements. As the gas flows through the furnace, it passes through each heating element sequentially, being continuously heated. Finally, the gas reaching the target temperature is discharged from the air outlet at the other end of the furnace, completing the heating operation. If the heating effect needs to be adjusted, the corresponding heating unit can be adjusted individually through the control unit, or multiple heating units can be controlled in zones.

[0018] The heating furnace provided in this application embodiment features a plug-in interface between the main body and the heating unit, along with a detachable control unit design. This facilitates easy assembly and disassembly of the heating units. In case of a single unit failure, the entire system can be installed without shutting down; only the faulty unit needs to be removed for repair or replacement, significantly reducing downtime and improving operational stability. Regarding temperature control accuracy and flexibility, each heating unit is independently equipped with a control unit, supporting single-unit or multi-unit zoned control. The heating intensity of each area can be precisely adjusted according to gas heating requirements, avoiding localized overheating or underheating and improving heating uniformity and accuracy. Furthermore, the modular heating unit design facilitates the addition or reduction of the number of heating units based on actual operating conditions, enhancing the equipment's applicability.

[0019] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more obvious and understandable, specific embodiments of this utility model are given below. Attached Figure Description

[0020] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 A schematic structural diagram of a heating furnace from one angle, according to an embodiment of this application; Figure 2 A schematic structural diagram of a heating furnace according to one embodiment of this application from another angle; Figure 3 This is a schematic structural diagram of a heating furnace according to one embodiment of the present application from another angle.

[0021] in, Figures 1 to 3 The correspondence between the reference numerals and component names in the attached drawings is as follows: 110 Body, 120 Heating Unit, 130 Pressure Detection Component, 140 Lifting Component, 150 Drain Pipe, 160 Control Valve; 111 Air inlet, 112 Air outlet, 113 Housing, 121 Control unit, 122 Heating unit. Detailed Implementation

[0022] The following description provides numerous specific details to offer a more thorough understanding of the technical solutions provided by this invention. However, it will be apparent to those skilled in the art that the technical solutions provided by this invention can be implemented without one or more of these details.

[0023] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of the stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or combinations thereof.

[0024] Exemplary embodiments according to the present invention will now be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of the present invention is thorough and complete, and that the concept of these exemplary embodiments is fully conveyed to those skilled in the art.

[0025] like Figures 1 to 3 As shown, a heating furnace is provided according to a first aspect of the present application, comprising: a body 110, wherein an air inlet 111 is formed at one end of the body 110 and an air outlet 112 is formed at the other end, and the body 110 has a plurality of insertion interfaces along its length; a plurality of heating units 120, wherein each insertion interface is used to insert one heating unit 120; wherein the heating unit 120 includes a control unit 121 and a heating unit 122, the heating unit 122 is connected to the control unit 121, the heating unit 122 is disposed within the body 110, and the control unit 121 is detachably connected to the body 110.

[0026] The heating furnace provided in this embodiment includes a body 110 and multiple heating units 120. Multiple connectors are formed on the body 110. Each heating unit 120 includes a control unit 121 and a heating unit 122. When the heating furnace is started, external gas to be heated enters the inner cavity of the body 110 through the air inlet 111 at one end of the body 110. Multiple connectors along the length of the body 110 are pre-connected to the heating units 120. The heating unit 122 of each heating unit 120 is located inside the body 110, while the control unit 121 is detachably connected to the outside of the body 110. At this time, the control unit 121 of each heating unit 120 operates independently, adjusting the working state (such as start / stop, heating power) of the corresponding heating unit 122 according to requirements. As the gas flows within the body 110, it passes through each heating unit 122 sequentially and is continuously heated by the heating unit 122. Finally, the gas reaching the target temperature is discharged from the air outlet 112 at the other end of the body 110, completing the heating operation. If the heating effect needs to be adjusted, the corresponding heating unit 120 can be adjusted individually through the control unit 121, or multiple heating units 120 can be controlled in zones.

[0027] The heating furnace provided in this embodiment features a plug-in interface between the body 110 and the heating unit 120, along with a detachable control unit 121. This design facilitates easy assembly and disassembly of the heating unit 120. In case of a single unit failure, the entire unit can be removed for repair or replacement without requiring a complete shutdown, significantly reducing downtime and improving operational stability. Regarding temperature control accuracy and flexibility, each heating unit 120 is independently equipped with a control unit 121, supporting single-unit or multi-unit zone control. This allows for precise adjustment of heating intensity in each area according to gas heating requirements, preventing localized overheating or underheating and improving heating uniformity and accuracy. Furthermore, the modular design of the heating unit 120 facilitates the addition or reduction of the number of heating units 120 based on actual operating conditions, enhancing the equipment's applicability.

[0028] When the heating furnace provided in this embodiment is applied to an airflow-type tobacco drying machine, during the operation of the airflow-type tobacco drying machine, the circulating process gas enters the heating furnace through the air inlet 111 at one end of the machine body 110. Heating units 120 are plugged into the insertion interface along the length of the machine body 110. Heating units 122 are placed inside the machine body 110, and control units 121 are detachably connected to the outside of the machine body 110. According to the drying process requirements, the control units 121 of each heating unit 120 adjust the power of the heating unit 122. Some units use high power for rapid temperature rise, while others use low power to maintain a constant temperature. As the process gas flows within the machine body 110, it is precisely heated to the target temperature by each heating unit 122, and then enters the drying pipe of the tobacco drying machine through the air outlet 112, where it completes heat and mass exchange with the tobacco, achieving tobacco drying and completing one heat source supply cycle. The detachable design of the heating units 120 allows for quick replacement of faulty units, preventing the entire tobacco drying production line from shutting down and ensuring continuous tobacco production. The zoned control function can precisely adjust the heating intensity according to the drying requirements of different tobacco shreds (such as flue-cured tobacco and blended tobacco shreds), preventing localized overheating that could cause the tobacco shreds to scorch, or insufficient heating that could affect the moisture content, thus improving the stability of tobacco shred quality. At the same time, the modular design allows for the addition or removal of 120 heating units according to the drying machine's capacity, adapting to different equipment specifications, and eliminating the need for gas pipelines, reducing safety hazards in the workshop and meeting the environmental protection and safe production requirements of the tobacco industry.

[0029] like Figures 1 to 3 As shown, in one feasible embodiment, the heating unit 122 includes a plurality of spaced-apart heating tubes. This arrangement, with multiple spaced-apart heating tubes, significantly increases the contact area with the process gas, resulting in more uniform heating of the gas as it flows within the machine body 110. This prevents the tobacco from scorching due to concentrated local heating and ensures the sensory quality of the tobacco. Simultaneously, the spaced design reduces gas flow resistance, ensuring smooth airflow and maintaining a stable circulating wind speed in the tobacco drying machine, preventing fluctuations in wind speed from affecting the tobacco drying efficiency. Furthermore, the multi-heating-tube structure facilitates individual repair and replacement of individual heating tubes in case of failure, without disassembling the entire heating unit 122, further reducing maintenance costs and downtime, and adapting to the continuous production requirements of airflow-type tobacco drying machines.

[0030] like Figures 1 to 3 As shown, in one feasible embodiment, the control unit 121 includes: a housing with a plurality of fixing holes formed on its periphery, the housing being detachably connected to the body 110 through the plurality of fixing holes; and a controller disposed within the housing; wherein the plurality of heating tubes are all connected to the housing.

[0031] This technical solution further provides the structural composition of the control unit 121. The control unit 121 may include a housing and a controller. The housing of the control unit 121 has multiple fixing holes on its periphery, which enable detachable connection with the machine body 110. This facilitates easy disassembly and assembly. In the event of a failure in a single heating unit 120, it can be quickly removed for repair or replacement without disassembling the machine body 110, avoiding prolonged shutdown of the airflow drying machine production line and ensuring continuous tobacco production. The housing houses the controller, providing protection for it and preventing dust and moisture from the drying workshop from affecting control accuracy. This ensures stable power regulation of the heating tubes and meets the precise temperature control requirements for tobacco drying. Simultaneously, multiple heating tubes are connected to the housing, making the connection between the heating tubes and the controller more organized, reducing the risk of failure caused by messy wiring, and facilitating quick positioning of the heating tubes during assembly. This improves the overall assembly efficiency of the heating unit 120 and meets the requirements for efficient operation and maintenance of tobacco equipment.

[0032] In this technical solution, each heating section 122 can be independently controlled in zones, allowing for precise adjustment of the heating power in the corresponding area to meet the temperature requirements of different process stages (such as preheating and constant temperature drying) of the airflow drying machine, thus avoiding energy waste caused by overall temperature control. Simultaneously, the heating section 122 can be fine-tuned according to differences in the moisture content of the tobacco, preventing temperature deviations in certain areas from affecting the uniformity of tobacco drying, ensuring consistent quality for each batch of tobacco, and meeting the tobacco industry's refined and customized production requirements for drying processes.

[0033] like Figures 1 to 3 As shown, in one feasible embodiment, the heating part 122 further includes flow guide fins connected to the outer wall of the heating tube.

[0034] In this technical solution, the heating unit 122 may further include guide fins. The guide fins of the heating unit 122 are connected to the outer wall of the heating tube. On the one hand, they can guide the airflow along a preset path, reduce the eddy current phenomenon of gas in the gap of the heating tube, significantly reduce the flow resistance of the medium, ensure the stability of the process gas circulation wind speed of the wire drying machine, and avoid the increase of fan energy consumption due to excessive resistance. On the other hand, the guide fins can expand the heat dissipation area of ​​the heating tube, allowing heat to be transferred to the airflow more evenly. At the same time, the fin structure can reduce the direct impact of the airflow on the heating tube, reduce the vibration wear of the heating tube, extend the service life of the heating unit 122, and meet the long-term stable operation requirements of the airflow-type wire drying machine.

[0035] like Figures 1 to 3 As shown, in one feasible embodiment, the heating furnace further includes a pressure detection element 130, which is connected to the body 110 and is used to obtain the pressure difference between the air inlet 111 and the air outlet 112.

[0036] In this technical solution, the pressure detection element 130 is connected to the machine body 110 and monitors the pressure difference between the air inlet 111 and the air outlet 112, providing real-time feedback on the airflow status inside the heating furnace. When dust accumulates on the heating tubes inside the machine body 110, the guide fins become blocked, the heating unit 120 malfunctions, or the airflow drying machine malfunctions, causing airflow obstruction, abnormal fluctuations in the pressure difference will occur. This will trigger an early warning in time, preventing localized dry burning of the heating furnace due to poor airflow, protecting equipment safety, and preventing a decrease in tobacco drying efficiency due to insufficient hot air supply. In addition, the pressure difference data can accurately determine whether the process gas circulation velocity meets the drying requirements, assisting in adjusting the power of the heating unit 120 and airflow parameters to ensure uniform heating of the tobacco, avoid deviations in tobacco moisture content due to unstable wind speed, ensure stable tobacco drying quality, and meet the industry's requirements for precise monitoring of the production process.

[0037] like Figures 1 to 3 As shown, in one feasible embodiment, the heating furnace further includes a lifting component 140, which is arranged on the top of the body 110. This arrangement allows for convenient installation, relocation, or maintenance of the heating furnace in conjunction with lifting equipment, eliminating the need for complex handling tools, significantly reducing the difficulty of equipment layout adjustment and maintenance in tobacco workshops, and improving operational efficiency.

[0038] like Figures 1 to 3 As shown, in one feasible embodiment, the body 110 includes: a plurality of housings 113, each housing 113 having a plug-in interface, and the plurality of housings 113 being detachably connected.

[0039] In this technical solution, the main body 110 may include multiple housings 113, consisting of multiple detachable housings 113 with plug-in interfaces. The number of housings 113 can be flexibly increased or decreased according to the production capacity of the airflow drying machine, adapting to the heat source requirements of different specifications of drying equipment and avoiding the cost waste caused by replacing the entire equipment. When a single housing 113 fails, it is not necessary to disassemble the entire main body 110; only the faulty housing 113 needs to be removed for repair or replacement, reducing downtime and ensuring continuous operation of the drying production line. At the same time, the detachable design facilitates the transportation and assembly of the heating furnace in the tobacco workshop, especially suitable for workshop layouts with limited space, reducing the difficulty of equipment installation. In addition, the independent structure of the housing 113 can reduce the impact of local failures on other areas, improve the overall operational stability of the heating furnace, and further adapt to the tobacco industry's requirements for efficient and reliable drying equipment.

[0040] like Figures 1 to 3 As shown, in one feasible embodiment, the heating furnace further includes: a drain pipe 150 connected to a low-lying area of ​​the body 110; and a control valve 160 disposed on the drain pipe 150.

[0041] In this technical solution, the heating furnace may also include a drain pipe 150 and a control valve 160. The drain pipe 150, connected to a low-lying area of ​​the machine body 110, can promptly drain moisture condensed from the process gas during furnace operation, preventing water accumulation inside the machine body 110 from corroding the heating tubes and extending the service life of the heating section 122. It also prevents water accumulation from affecting airflow and causing a decrease in heating efficiency. The control valve 160 on the drain pipe 150 can flexibly control the timing and volume of drainage, allowing for precise drainage according to the workshop's production rhythm (such as drying intervals), avoiding unnecessary drainage operations that interfere with the normal drying process. This design is suitable for humid conditions in airflow-type drying machines, reducing the risk of equipment failure, ensuring a stable heat source supply, and meeting the requirements for long-term reliable operation of tobacco equipment.

[0042] In one feasible embodiment, the heating furnace further includes: a heat insulation layer disposed on the inner wall of the body 110; and an observation window disposed on the side wall of the body 110.

[0043] In this technical solution, the heating furnace may include a heat insulation layer and an observation window. The heat insulation layer on the inner wall of the machine body 110 effectively prevents heat loss from the heating section 122, reducing energy consumption. Simultaneously, it prevents burns to operators from excessively high temperatures on the outer wall of the machine body 110, improving workshop safety and meeting the safety production requirements of the tobacco industry. The observation window on the side wall allows staff to directly observe the working status of the heating tubes and guide fins inside the machine body 110, as well as any dust accumulation or damage. Routine inspections can be completed without disassembling the machine body 110, shortening troubleshooting time. The combination of these two features reduces energy consumption, ensures safety, simplifies maintenance processes, and helps the airflow-type tobacco drying machine continuously and stably provide a heat source, ensuring the efficient progress of the tobacco drying process.

[0044] like Figures 1 to 3 As shown, a second aspect of the embodiments of this application provides an airflow-type wire drying machine, comprising: a heating furnace as described in any of the above technical solutions; a wire drying machine body, the wire drying machine body including a return air duct and a drying duct, the return air duct being connected to the air inlet 111 of the heating furnace, and the drying duct being connected to the air outlet 112 of the heating furnace.

[0045] The airflow drying machine provided in this application includes a heating furnace as described in any of the above technical solutions. Therefore, the airflow drying machine has all the beneficial effects of the heating furnace described in the above technical solutions, which will not be elaborated here.

[0046] The airflow-type tobacco drying machine provided in this application embodiment operates as follows: During operation, the low-temperature process gas, after heat and mass exchange with the tobacco shreds in the drying pipe of the drying machine body, is transported through the return air pipe to the air inlet 111 of the heating furnace and enters the machine body 110. A heating unit 120 is pre-inserted into the interface of the machine body 110, with its heating section 122 located inside the machine body 110 and a control unit 121 detachably connected to the outside of the machine body 110. The control unit 121 adjusts the power of the heating section 122 according to the drying requirements to heat the incoming process gas. The heated high-temperature process gas flows out from the air outlet 112 and enters the drying pipe to contact the tobacco shreds, achieving tobacco drying and completing one cycle of process gas heating and drying. If the drying effect needs to be adjusted, the heating unit 120 can be adjusted individually or by zone through the control unit 121. The heating furnace and the return air pipe and drying pipe of the drying machine body are adapted and connected to form a closed-loop heating system, ensuring the recycling of process gas and reducing heat loss. The detachable design of heating unit 120 allows for maintenance without shutting down the entire plant in case of a single unit failure; only the faulty unit needs to be replaced, ensuring continuous tobacco drying production. Furthermore, heating unit 120 can be independently or zoned for temperature control, precisely adjusting heating power according to tobacco type and moisture content to prevent over-drying or scorching, thus improving the stability of dried tobacco quality. Simultaneously, it eliminates the need for gas / fuel pipelines, reducing safety hazards in the workshop and meeting the tobacco industry's requirements for efficient and safe production.

[0047] In this utility model, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "join," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "join" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0048] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or unit 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 this utility model.

[0049] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0050] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A heating furnace, characterized in that, include: The body has an air inlet at one end and an air outlet at the other end, and has multiple connectors along its length. Multiple heating units, with one heating unit inserted into each of the aforementioned interfaces; The heating unit includes a control unit and a heating unit. The heating unit is connected to the control unit and is disposed within the machine body. The control unit is detachably connected to the machine body.

2. The heating furnace according to claim 1, characterized in that, The heating section includes multiple heating tubes arranged at intervals.

3. The heating furnace according to claim 2, characterized in that, The control unit includes: The housing has multiple fixing holes formed on its periphery, and the housing is detachably connected to the body through the multiple fixing holes; The controller is disposed within the housing; The heating tubes are all connected to the housing.

4. The heating furnace according to claim 2, characterized in that, The heating section further includes flow guide fins, which are connected to the outer wall of the heating tube.

5. The heating furnace according to claim 1, characterized in that, Also includes: A pressure detection element is connected to the machine body and is used to obtain the pressure difference between the air inlet and the air outlet.

6. The heating furnace according to claim 1, characterized in that, Also includes: A lifting device is arranged on the top of the machine body.

7. The heating furnace according to claim 1, characterized in that, The body includes: Multiple housings, each housing having a socket, the multiple housings being detachably connected.

8. The heating furnace according to claim 1, characterized in that, Also includes: A drain pipe, which connects to a low-lying area of ​​the body; A control valve is provided on the drain pipe.

9. The heating furnace according to claim 1, characterized in that, Also includes: A heat insulation layer is disposed on the inner wall of the body; An observation window is provided on the side wall of the body.

10. An airflow-type yarn drying machine, characterized in that, include: The heating furnace as described in any one of claims 1 to 9; The main body of the wire drying machine includes a return air duct and a drying duct. The return air duct is connected to the air inlet of the heating furnace, and the drying duct is connected to the air outlet of the heating furnace.

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