Tube drawing forming muffle furnace

Abstract

The utility model provides a tube drawing forming muffle furnace which comprises a heating assembly, the heating assembly comprises a cabin body and a cabin door, and the cabin door is connected with the cabin body; the feeding assembly is communicated with the heating assembly; the air exhaust assembly comprises a first mounting seat structure and an air exhaust structure, the first mounting seat structure is connected with the feeding assembly, the air exhaust structure is connected with the first mounting seat structure, the air exhaust structure and the cabin door are correspondingly arranged, and the projection width of the air exhaust structure in the vertical direction is larger than that of the cabin door in the vertical direction. According to the technical scheme, the problem that equipment is damaged due to the fact that high-temperature smoke overflows when the furnace opening of the muffle furnace is opened in the prior art is effectively solved.

Description

Technical Field

[0001] The present application relates to the technical field of glass processing, and in particular to a tube drawing and forming muffle furnace. Background Art

[0002] During the preparation of medium-borosilicate pharmaceutical glass, the molten glass is wound around a low-speed rotating tube and gradually flattened to form a smooth glass surface under the heating of a muffle furnace. The molten glass is formed into a hollow round glass tube under the action of the wind from the rotating tube core shaft.

[0003] In the process of glass tube production, the rotating tube is often replaced. When replacing the rotating tube, the rotating tube needs to be withdrawn from the muffle furnace.

[0004] In the muffle furnace in the prior art, during the process of withdrawing or installing the rotating tube and in the idle period from withdrawal to installation completion, high-temperature flames or gases in the muffle furnace will radiate and overflow from the furnace mouth. The high-temperature flames or gases will cause equipment damage, control system interference, and poor insulation performance of high-voltage equipment, etc., increasing the difficulty of equipment maintenance and safety risks, and reducing the service life of the equipment, such as CN115979003A. Utility Model Content

[0005] A technical problem to be solved by the present application is that when the mouth of the muffle furnace is opened, there is a problem of equipment damage caused by overflow of high-temperature flue gas.

[0006] In order to solve the above technical problems, the present application provides a tube drawing and forming muffle furnace.

[0007] A tube drawing and forming muffle furnace provided according to the present application includes: a heating assembly, the heating assembly includes a cabin body and a cabin door, the cabin door is connected to the cabin body; a feeding assembly, the feeding assembly is connected to the heating assembly; an exhaust assembly, the exhaust assembly includes a first mounting seat structure and an exhaust structure, the first mounting seat structure is connected to the feeding assembly, the exhaust structure is connected to the first mounting seat structure, the exhaust structure and the cabin door are arranged correspondingly, and the projection width of the exhaust structure in the vertical direction is greater than the projection width of the cabin door in the vertical direction.

[0008] In some embodiments, the cross-sectional area of ​​the horizontal plane of the exhaust structure decreases continuously in the direction from close to to far away from the cabin door.

[0009] In some embodiments, the exhaust structure includes a fireproof layer, a reinforcement layer and an insulation layer, which are connected in sequence. The fireproof layer is located on the side of the reinforcement layer close to the cabin door, and the insulation layer is located on the side of the reinforcement layer away from the cabin door.

[0010] In some embodiments, the fire barrier layer is made of calcium silicate fiberboard.

[0011] In some embodiments, the strengthening layer is made of a stainless steel material.

[0012] In some embodiments, the insulating layer is made of epoxy material.

[0013] In some embodiments, the exhaust structure includes a plurality of fan-shaped exhaust parts, and the plurality of fan-shaped exhaust parts are rotatably connected in sequence.

[0014] In some embodiments, the fan-shaped exhaust portion includes a first limiting segment, an arc segment, and a second limiting segment, wherein the first limiting segment, the arc segment, and the second limiting segment are connected in sequence. In some embodiments, the exhaust structure further includes a driving portion, the driving portion is rotatably connected to the feeding assembly, and the output end of the driving portion is rotatably connected to the fan-shaped exhaust portion.

[0015] In some embodiments, the exhaust assembly also includes a negative pressure structure, and the negative pressure structure is connected to the exhaust structure.

[0016] Through the above technical solution, the tube drawing forming muffle furnace provided by the present application, when the hatch needs to be opened, the exhaust assembly is first started and then the hatch is opened, and the high-temperature flue gas in the cabin enters the exhaust structure under the action of the exhaust assembly, and the projection width of the exhaust structure in the vertical direction is greater than the projection width of the hatch in the vertical direction to ensure that the flue gas will not leak out, and the setting of the exhaust assembly avoids the high-temperature flue gas in the cabin from contacting other structures outside the equipment, causing equipment damage, reduced life and other problems. The technical solution of the present application effectively solves the problem of equipment damage caused by high-temperature flue gas overflow when the muffle furnace mouth is opened in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 The left side structural schematic diagram of the tube drawing and forming muffle furnace disclosed in the first embodiment of the present application is shown;

[0019] Figure 2 Shows Figure 1 A schematic diagram of the structure of the exhaust assembly of the tube drawing and forming muffle furnace;

[0020] Figure 3 Shows Figure 1 A left-side sectional structural schematic diagram of an exhaust structure of a tube drawing and forming muffle furnace;

[0021] Figure 4 Shows Figure 1A schematic structural diagram of a first mounting seat structure of a tube drawing and forming muffle furnace;

[0022] Figure 5 A schematic diagram of the left-side cross-sectional structure of the fan-shaped exhaust portion of the tube drawing and forming muffle furnace disclosed in Example 2 of the present application is shown.

[0023] Description of reference numerals:

[0024] 10. Heating assembly; 11. Cabin body; 12. Cabin door; 20. Feeding assembly; 21. Second mounting seat structure; 30. Exhaust assembly; 31. First mounting seat structure; 32. Exhaust structure; 321. Fireproof layer; 322. Strengthening layer; 323. Insulating layer; 324. Fan-shaped exhaust section; 3241. First limiting section; 3242. Arc section; 3243. Second limiting section; 33. Negative pressure structure. DETAILED DESCRIPTION

[0025] The following is a further detailed description of the implementation methods of the present application in conjunction with the accompanying drawings and examples. The detailed descriptions and drawings of the following examples are used to exemplarily illustrate the principles of the present application, but cannot be used to limit the scope of the present application. The present application can be implemented in many different forms and is not limited to the specific embodiments of the present application, but includes all technical solutions that fall within the scope of the claims.

[0026] The present application provides these embodiments to make the present application thorough and complete, and to fully express the scope of the present application to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary, and not as limiting.

[0027] It should be noted that, in the description of this application, unless otherwise specified, the meaning of "multiple" is greater than or equal to two; the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the orientation or positional relationship, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0028] In addition, the words "first", "second" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different parts. "Vertical" does not mean vertical in the strict sense, but is within the tolerance range. "Parallel" does not mean parallel in the strict sense, but is within the tolerance range. "Include" or "comprising" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements.

[0029] It should also be noted that in the description of this application, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0030] All terms used in this application have the same meaning as those understood by those of ordinary skill in the art to which this application belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, such as general dictionaries, should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0031] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0032] like Figures 1 to 4 As shown, the tube drawing and forming muffle furnace provided in the first embodiment of the present application includes: a heating component 10, a feeding component 20 and an exhaust component 30, the heating component 10 includes a cabin 11 and a cabin door 12, the cabin door 12 is connected to the cabin 11, the feeding component 20 is connected to the heating component 10, the exhaust component 30 includes a first mounting seat structure 31 and an exhaust structure 32, the first mounting seat structure 31 is connected to the feeding component 20, the exhaust structure 32 is connected to the first mounting seat structure 31, the exhaust structure 32 is arranged corresponding to the cabin door 12, and the projection width of the exhaust structure 32 in the vertical direction is greater than the projection width of the cabin door 12 in the vertical direction.

[0033] By applying the technical solution of the first embodiment, when the hatch needs to be opened, the exhaust assembly 30 is first started and then the hatch is opened. The high-temperature flue gas in the cabin 11 enters the exhaust structure 32 under the action of the exhaust assembly 30. The projection width of the exhaust structure 32 in the vertical direction is greater than the projection width of the hatch in the vertical direction, which ensures that the flue gas will not leak out. The setting of the exhaust assembly 30 avoids the high-temperature flue gas in the cabin 11 from contacting other structures outside the equipment, causing equipment damage, reduced service life and other problems. The technical solution of the first embodiment effectively solves the problem of equipment damage caused by high-temperature flue gas overflow when the muffle furnace mouth is opened in the prior art.

[0034] The width direction is Figure 2The X-axis direction is shown.

[0035] The feeding assembly 20 includes a feeding channel, a feeding channel support base and a second mounting seat structure 21. The feeding channel is connected to the feeding channel support base, the second mounting seat structure 21 is connected to the feeding channel support base, the first mounting seat structure 31 is connected to the second mounting seat structure 21, and an insulating gasket is arranged between the connecting fasteners and the first mounting seat structure 31 and the second mounting seat structure 21 to further avoid leakage.

[0036] like Figures 1 to 3 As shown, in the technical solution of the first embodiment, the cross-sectional area of ​​the horizontal plane of the exhaust structure 32 is continuously reduced along the direction from close to far away from the hatch 12. The exhaust structure 32 includes a first plate, a second plate, a third plate, a fourth plate and a fifth plate. The first plate is connected to the second plate, the second plate is connected to the third plate, the third plate has a predetermined angle with the vertical direction, the fourth plate and the fifth plate are both connected to the first plate, the second plate and the third plate, and the fourth plate and the fifth plate are arranged oppositely. The arrangement of the third plate guides the flow of the airflow, further preventing the high-temperature gas and flame at the hatch from spilling out.

[0037] like Figures 1 to 3 As shown, in the technical solution of the first embodiment, the exhaust structure 32 includes a fireproof layer 321, a strengthening layer 322 and an insulating layer 323, which are connected in sequence, and the fireproof layer 321 is located on the side of the strengthening layer 322 close to the hatch 12, and the insulating layer 323 is located on the side of the strengthening layer 322 away from the hatch 12. The fireproof layer 321 is located at the innermost side of the entire exhaust structure 32 to prevent burning by open flames and high-temperature smoke, etc. The strengthening layer 322 is made of a material with high strength and not easy to deform, to ensure the stability of the shape of the entire exhaust structure 32; the insulating layer 323 prevents the circuit components on the feeding assembly 20 from leaking electricity in a high temperature environment, causing the exhaust structure to be charged, and the problem of fire easily caused by contact with open flames.

[0038] like Figures 1 to 3 As shown, in the technical solution of the first embodiment, the fireproof layer 321 is made of calcium silicate fiberboard. The calcium silicate limiter board has good fireproof performance, high temperature resistance, good heat insulation performance and is relatively light, which is convenient for staff to install and replace. The thickness of the fireproof layer 321 is greater than 1 cm and less than 3 cm to ensure good fireproof performance, protect the strengthening layer 322 and the insulating layer 323 from the influence of high temperature open flames, and minimize the mass of the fireproof layer 321, which complies with the principle of lightweight.

[0039] like Figures 1 to 3As shown, in the technical solution of the first embodiment, the strengthening layer 322 is made of stainless steel. Stainless steel has high strength, is not easy to deform, and is not easy to melt in a high temperature environment. The setting of the strengthening layer 322 allows the entire exhaust structure 32 to maintain a certain shape. The thickness of the strengthening layer 322 is greater than 2 mm, which ensures rigidity while reducing the mass as much as possible to reduce the mass that the first mounting seat structure 31 needs to bear, thereby ensuring the stability of the entire device.

[0040] like Figures 1 to 3 As shown, in the technical solution of the first embodiment, the insulating layer 323 is made of epoxy resin material. The epoxy resin laminate has good insulation performance below 250°C, which effectively avoids the problem that the exhaust structure 32 is charged due to leakage of the feeding assembly 20 in a high temperature environment.

[0041] like Figure 1 and Figure 2 As shown, in the technical solution of the first embodiment, the exhaust assembly 30 further includes a negative pressure structure 33, and the negative pressure structure 33 is connected to the exhaust structure 32. The negative pressure structure 33 includes an exhaust pipe and an exhaust motor. The exhaust motor extracts air, and the high-temperature gas at the exhaust structure 32 is discharged along the exhaust pipe to prevent the high-temperature gas from affecting the operation of the staff at the cabin door.

[0042] like Figure 5 As shown, the difference between the technical solution of the second embodiment and the technical solution of the first embodiment is that the exhaust structure 32 includes a plurality of fan-shaped exhaust parts 324, and the plurality of fan-shaped exhaust parts 324 are rotatably connected in sequence. The plurality of fan-shaped exhaust parts 324 are connected by hinges, and the entire exhaust structure 32 can be folded by rotating the fan-shaped exhaust parts 324, so that the occupied space of the exhaust structure 32 is reduced when exhaust is not needed, and the exhaust structure 32 is prevented from blocking the visible window of the heating assembly 10, which affects the staff's observation of the internal situation of the cabin 11.

[0043] like Figure 5 As shown, in the technical solution of the second embodiment, the fan-shaped exhaust portion 324 includes a first limiting segment 3241, an arc segment 3242 and a second limiting segment 3243, and the first limiting segment 3241, the arc segment 3242 and the second limiting segment 3243 are connected in sequence. The first limiting segment 3241 and the second limiting segment 3243 are respectively arranged at both ends of the arc segment 3242, and the arrangement of the first limiting segment 3241 and the second limiting segment 3243 prevents the adjacent fan-shaped exhaust portions 324 from being separated during the rotation process.

[0044] In the technical solution of embodiment 2, the fan-shaped exhaust portion 324 includes three, and the diameters of the arc segments 3242 of the three fan-shaped exhaust portions 324 increase successively. The outer diameter of the arc segment 3242 of the first fan-shaped exhaust portion 324 is equal to the inner diameter of the first limiting segment 3241 of the second fan-shaped exhaust portion 324, and the outer diameter of the second limiting segment 3243 of the first fan-shaped exhaust portion 324 is equal to the inner diameter of the arc segment 3242 of the second fan-shaped exhaust portion 324. When the exhaust structure 32 is in a fully expanded state, the second limiting segment 3243 of the first fan-shaped exhaust portion 324 and the first limiting segment 3241 of the second fan-shaped exhaust portion 324 are pressed against each other to form a limit to avoid separation.

[0045] like Figure 5 As shown, in the technical solution of the second embodiment, the exhaust structure 32 also includes a driving part, the driving part is rotatably connected to the feeding assembly 20, and the output end of the driving part is rotatably connected to the fan-shaped exhaust part 324. The driving part adopts an electric push rod, and the extension and contraction of the electric push rod drives the rotation of the fan-shaped exhaust part 324, thereby controlling the expansion and folding of the exhaust structure 32. Controlling the expansion and folding of the exhaust structure 32 by the driving part avoids the problem of high temperature burns caused by manual operation of the staff.

[0046] From the above, it can be known that the purpose of this application is to provide a design scheme for a fireproof exhaust hood (exhaust assembly 30) of a muffle furnace for forming drawn glass tubes for medicinal glass. The fireproof exhaust hood of the muffle furnace for forming drawn glass tubes for medicinal glass not only reduces equipment damage caused by high-temperature flames or gas burning, effectively protects expensive equipment, increases equipment service life and reduces maintenance costs, and reduces measurement errors or damage to detection equipment caused by exposure of compensation wires or thermocouple terminals to high temperature environments, improves detection accuracy and anti-interference capabilities of detection equipment, and reduces the labor intensity of maintenance personnel; it can also reduce safety risks during the installation, inspection, and maintenance of equipment, save operating time, and improve safety factors and work efficiency. The fireproof exhaust hood of the muffle furnace for forming drawn glass tubes for medicinal glass includes a bracket (a first mounting seat structure 31 and a second mounting seat structure 21) and a fireproof exhaust hood assembly (exhaust structure 32), a total of two parts. The bracket is mainly composed of a fireproof cover mounting bracket, fixings, insulating plates, insulating sleeves, insulating gaskets and fastening bolts and nuts. The end of the feeder is a platinum feeder. The voltage is 80V and the current exceeds 100A. The dangerous power supply is heated. The leakage voltage is not allowed to exceed 36V. At the same time, according to the process requirements, the voltage change of the equipment to the ground affects the product quality. Therefore, regardless of the process requirements or the safety production requirements, personnel and equipment are not allowed to directly contact the end of the feeder. However, the bracket needs to be installed on the base of the feeder support bracket, and there is a risk of contact. Therefore, the insulation measures of the bracket are of utmost importance. In this application, the fixed There is an insulating plate between the parts and the base of the feed channel support bracket and the fire hood mounting bracket for overall insulation. The holes for fixing the fastening bolts of the fixing parts, the base of the feed channel support bracket and the fire hood mounting bracket are all equipped with insulating sleeves to prevent contact and conduction when the bolts are fixed. Insulating gaskets are used in the fastening bolts and nuts to insulate the bracket as a whole. The most important function of the fire exhaust hood assembly is to prevent high-temperature flames or smoke from damaging the equipment and instruments above the muffle furnace when the rotating tube is installed and replaced in the muffle furnace. The high-temperature smoke can be led to a safe place through the pipe through the fire exhaust hood assembly in time. The fire exhaust hood assembly is mainly composed of a fire exhaust hood, an exhaust pipe, an exhaust motor, and a regulating butterfly valve. The fire exhaust hood assembly should not only consider its fire resistance and high temperature resistance, but also insulation measures are equally important. Therefore, the fire exhaust hood is made of an outer wall epoxy resin laminate wrapped with an inner wall steel plate. The steel plate directly contacts the flame to block the open flame, and the epoxy resin laminate is not only insulated but also resistant to high temperature. Therefore, the fire exhaust hood can achieve the purpose of safe fire prevention. The exhaust duct is wrapped with silica aerogel insulation felt for heat insulation and insulation. The butterfly valve is adjusted to adjust the duct opening to match the air volume to meet the process requirements. The exhaust motor and inverter are matched to meet the exhaust requirements. In this application, the fireproof exhaust hood mounting bracket is made of "L"-shaped ordinary steel plate with a length of 170mm*170mm*100mm in the three directions of X, Y, and Z axis and a thickness of 20mm. M12 mounting threaded holes are opened on the two assembly surfaces.The fixings are made of ordinary steel plates with an "L" shape and a length of 80mm*80mm*100mm and a thickness of 20mm in the three directions of the X, Y, and Z axes. M12 mounting threaded holes are opened on the two assembly surfaces on both sides of the reinforcement. The insulation board, insulation sleeve, and insulation gasket are the most important accessories of the bracket, which are related to the overall insulation effect of the fire hood. The average temperature around the platinum channel at the end of the feed channel is about 60℃. The insulation board is made of epoxy resin laminates with a length of 100mm, a width of 80mm, and a thickness of 20mm. According to the threaded hole size of the fire hood mounting bracket and the fixings, and the fire hood mounting bracket and the feed channel support bracket base, the fire hood mounting bracket and the fixings, and the fire hood mounting bracket and the feed channel support bracket base are mainly used for insulation. The insulating sleeve is made of a ceramic tube with a thickness of 1.5mm, a diameter of 12mm, an inner diameter of 10.5mm and a height of 60mm. It is mainly used for fixing bolt insulation. The insulating gasket is an M12 polytetrafluoroethylene gasket, which is used to insulate the bolts and nuts from the fireproof exhaust hood mounting bracket, the feeder channel support bracket base and other accessories. The design structure is based on the dimensions of the surrounding environment of the feeder channel, muffle furnace (heating component 10) and accessory equipment on-site installation, and is installed in the non-interference area of ​​the feeder channel support bracket base of the platinum channel at the end of the feeder channel. The most important function of this mechanism is to prevent high-temperature flames or smoke from damaging the equipment and instruments above the muffle furnace when the rotating tube is installed and replaced in the muffle furnace, and can timely lead the high-temperature smoke through the exhaust hood assembly through the pipeline to a safe place. The exhaust hood assembly is mainly composed of a fireproof exhaust hood, an exhaust duct, an exhaust motor, and a regulating butterfly valve. Due to the particularity of the installation environment, insulation and fire resistance and high temperature resistance are important performance indicators of the exhaust hood assembly structure. The exhaust fire hood is made of 2mm thick stainless steel plate with a total length of 1500mm, a total height of 180mm, an upper width of 160mm and a lower width of 400mm. The upper wide surface is provided with an exhaust port with a diameter of 100mm. The exhaust fire hood is equipped with a calcium silicate fiberboard with a thickness of 10mm to prevent open flames and high-temperature smoke from burning. The exhaust fire hood is wrapped with a 5mm thick epoxy resin laminate. The epoxy resin laminate has good insulation performance in the temperature range of -100℃ to 250℃. Therefore, the exhaust fire hood wrapped with epoxy resin laminate has good insulation performance. The exhaust duct uses a high-temperature duct with a diameter of 100mm. The high-temperature duct material is made of composite materials such as spring steel wire glass fiber fabric (glass fiber wrapped with silicone), which is both resistant to high temperature and has a certain insulation effect. The regulating butterfly valve can adjust the opening to adjust the exhaust volume. The exhaust motor uses a high-temperature resistant motor with an air volume of 1000-1500m. 3 / h branch pipe air volume is 300-500m 3 The flow rate is 1 / h, and the pressure in the exhaust hood does not exceed 80Pa to avoid affecting the muffle furnace process.

[0047] So far, the embodiments of the present application have been described in detail. In order to avoid obscuring the concept of the present application, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution of the present application.

[0048] Although some specific embodiments of the present application have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict.

Claims

1. A tube drawing muffle furnace, characterized in that: include: A heating assembly (10), the heating assembly (10) comprising a cabin (11) and a cabin door (12), the cabin door (12) being connected to the cabin (11); A material supply component (20), the material supply component (20) being in communication with the heating component (10); An exhaust assembly (30), the exhaust assembly (30) comprising a first mounting seat structure (31) and an exhaust structure (32), the first mounting seat structure (31) being connected to the feeding assembly (20), the exhaust structure (32) being connected to the first mounting seat structure (31), the exhaust structure (32) being arranged corresponding to the cabin door (12), and the projection width of the exhaust structure (32) in the vertical direction being greater than the projection width of the cabin door (12) in the vertical direction.

2. The tube drawing and forming muffle furnace according to claim 1, characterized in that: The cross-sectional area of ​​the horizontal plane of the exhaust structure (32) decreases continuously in the direction from approaching to moving away from the cabin door (12).

3. The tube drawing and forming muffle furnace according to claim 1, characterized in that: The exhaust structure (32) comprises a fireproof layer (321), a strengthening layer (322) and an insulating layer (323); the fireproof layer (321), the strengthening layer (322) and the insulating layer (323) are connected in sequence; the fireproof layer (321) is located on a side of the strengthening layer (322) close to the cabin door (12), and the insulating layer (323) is located on a side of the strengthening layer (322) away from the cabin door (12).

4. The tube drawing and forming muffle furnace according to claim 3, characterized in that: The fireproof layer (321) is made of calcium silicate fiberboard.

5. The tube drawing and forming muffle furnace according to claim 3, characterized in that: The strengthening layer (322) is made of stainless steel.

6. The tube drawing and forming muffle furnace according to claim 3, characterized in that: The insulating layer (323) is made of epoxy resin material.

7. The tube drawing and forming muffle furnace according to claim 1, characterized in that: The exhaust structure (32) comprises a plurality of fan-shaped exhaust parts (324), and the plurality of fan-shaped exhaust parts (324) are rotatably connected in sequence.

8. The tube drawing and forming muffle furnace according to claim 7, characterized in that: The fan-shaped exhaust portion (324) comprises a first limiting segment (3241), an arc segment (3242) and a second limiting segment (3243), and the first limiting segment (3241), the arc segment (3242) and the second limiting segment (3243) are connected in sequence.

9. The tube drawing and forming muffle furnace according to claim 7, characterized in that: The exhaust structure (32) further comprises a driving unit, wherein the driving unit is rotatably connected to the material feeding assembly (20), and an output end of the driving unit is rotatably connected to the fan-shaped exhaust unit (324).

10. The tube drawing muffle furnace according to any one of claims 1 to 9, characterized in that: The exhaust assembly (30) further comprises a negative pressure structure (33), wherein the negative pressure structure (33) is in communication with the exhaust structure (32).

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