Continuous feeding and discharging heat treatment experimental device

Abstract

A continuous feeding and discharging heat treatment experimental device comprises a base, a furnace shell, an inner pipe, a heating assembly and a rotary supporting assembly. Wherein the furnace shell is fixedly arranged on the base. An inner cavity of the furnace shell is a hearth, the inner pipe is arranged in the hearth, the two ends of the inner pipe penetrate through the furnace shell and then extend to the outside, and the two ends, extending to the outside, of the inner pipe are fixed to the base through rotary supporting assemblies. And the heating assembly is arranged in the hearth. And spiral bulges are arranged on the inner wall of the inner pipe. According to the continuous feeding and discharging heat treatment experimental device, the spiral protrusions are arranged on the inner wall of the inner pipe, materials can move forwards under the action of rotation of the inner pipe, and full-automatic feeding and discharging are achieved. The experiment device does not need to be manually disassembled, re-cooled or re-heated and the like, experiment materials are simple and easy to add and take, manpower and time are saved, and the experiment efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a heat treatment experiment device, concretely relates to a continuous feeding and discharging heat treatment experiment device belongs to heat treatment equipment technical field. BACKGROUND

[0002] Heat treatment is an important link of material processing in industrial production, and the heat treatment furnace is the core equipment of heat treatment process. The tubular furnace is a key sintering equipment applied in the field of new material research, and is one of the main equipment for heat treatment, calcination and reduction of samples in scientific research and production, can provide specific temperature and atmosphere environment, vacuum environment in the sintering process, and ensure the purity of sintering environment, and is a commonly used heat treatment furnace.

[0003] There are various tubular furnaces for treating granular materials in the prior art. For example, Chinese patent CN101482368B "high temperature rotating tubular furnace device" discloses a high temperature rotating tubular furnace device, which comprises a support table, a high temperature furnace is arranged on the support table, an electric heating element is arranged in the high temperature furnace, a rotating inner tube is installed in the high temperature furnace, the two ends of the inner tube respectively extend out of the high temperature furnace and are fixedly installed with a limiting sleeve, a roller frame is arranged below the limiting sleeve, the roller frame is composed of a driving roller supporting the limiting sleeve and a driven roller, and the driving roller is connected with a speed regulating motor arranged on the support table through one or several stages of transmission. The invention can realize the rotation of the inner tube, which is helpful for uniform heating of the material, but since there is only one temperature zone, it cannot realize multi-stage independent temperature control, resulting in limited experimental process parameter setting range; in addition, the operation of adding experimental material is relatively complicated, and only repeated feeding and repeated temperature rising and falling can be realized, which is time-consuming and laborious. Chinese patent CN202066355U "five temperature zone tubular furnace" discloses a five temperature zone tubular furnace, which comprises a furnace body, an inner tube is transversely arranged in the middle of the furnace body, a first heating zone, a second heating zone, a third heating zone, a fourth heating zone and a fifth heating zone are uniformly arranged on the outer wall of the inner tube, the heating zones are isolated by partition plates, and a thermocouple and a temperature control table are arranged on each heating zone. The device can flexibly control the temperature gradient of the whole furnace cavity by controlling the temperature of different heating zones, thereby effectively lengthening the length of the constant temperature zone and more flexibly adjusting the furnace cavity temperature curve, and ensuring the realization of the process. However, the non-rotating may cause uneven heating of the material; in addition, the operation of adding experimental material is relatively complicated, and only repeated feeding and repeated temperature rising and falling can be realized, which cannot realize continuous feeding and discharging of material, and the operation is time-consuming and laborious.

[0004] Generally fixed tube furnace shell can cause uneven heating of particulate material, horizontal rotary furnace shell efficiency is lower, can not realize the continuous test operation requirements, if there are multiple batches of materials need to be processed, also need to disassemble the test device, take out the previous batch of materials, replace the new test sample, even need to recool and heat the material, resulting in low processing efficiency and high labor intensity, consume a lot of manpower and time. In general, the existing tube furnace mainly has the following shortcomings: (1) the furnace body cannot be lifted at an angle, and direct tilting discharge cannot be realized. (2) Experimental materials need to be loaded and unloaded separately each time, and continuous experimental material cannot be fed in and out. Practical new type content

[0005] In view of the problems of uneven heating of materials in the furnace body of the existing technology, the inability to realize continuous feeding and discharging, and the low processing efficiency and high labor intensity, the utility model provides a continuous feeding and discharging heat treatment experimental device, which adopts an inner tube with spiral protrusions on the inner wall. After the material enters the heat treatment furnace, the inner tube rotates and moves the material forward, so that the material in the inner tube is evenly heated, and the functions of continuous feeding and discharging are realized. The operation procedures and difficulty of manually adding experimental materials are reduced, and the experimental efficiency is improved.

[0006] A continuous feeding and discharging heat treatment experimental device, which comprises a base, a furnace shell, an inner tube, a heating assembly, and a rotary support assembly. The furnace shell is fixedly arranged on the base. The internal cavity of the furnace shell is a hearth, the inner tube is arranged in the hearth, and the two ends of the inner tube extend to the outside through the furnace shell. The two ends of the inner tube extending to the outside are fixed on the base through the rotary support assembly. The heating assembly is arranged in the hearth. The inner wall of the inner tube is provided with spiral protrusions.

[0007] Preferably, the device further comprises a lifting assembly; the lifting assembly comprises a telescopic rod and a driving motor. The telescopic end of the telescopic rod is connected with the base, and the fixed end of the telescopic rod is arranged on the ground or the experimental table. The driving motor is arranged on the ground or the experimental table and is connected with the fixed end of the telescopic rod. In the vertical direction, the driving motor drives the telescopic end of the telescopic rod to lift up or down with the fixed end as the fulcrum, so that one end of the base is lifted up or lowered down with the other end as the fulcrum.

[0008] Preferably, the height of the spiral protrusion in the radial direction of the inner tube is 1-100 mm, preferably 3-80 mm, and more preferably 5-50 mm.

[0009] Preferably, in the axial direction of the inner tube, the inner tube body with spiral protrusions accounts for 50%-100% of the overall length, preferably 85%-95%. Preferably, the spiral protrusions are arranged on the inner wall of the inner tube in the hearth.

[0010] Preferably, the helical protrusions are continuously or discontinuously extended multi-section protrusions along the axial direction of the inner tube. Preferably, the helical protrusions are 2-30 section protrusions discontinuously extended.

[0011] Preferably, the axial distance between any two adjacent helical protrusions is less than 10-80%, preferably 20-60% of the length of the inner tube.

[0012] Preferably, the furnace chamber in the furnace shell is divided into 2-5 temperature zones along the axial direction of the inner tube according to the direction of the material, and each temperature zone is provided with an independent heating assembly.

[0013] Preferably, the heating assembly is a resistance wire or a silicon-carbon rod, more preferably a resistance wire.

[0014] Preferably, each temperature zone of the furnace chamber is provided with a temperature detection device.

[0015] Preferably, the furnace shell is an openable structure. Preferably, the furnace shell comprises an independent upper furnace shell and a lower furnace shell, the upper furnace shell and the lower furnace shell are connected by a rotating shaft, and the upper furnace shell can rotate around the rotating shaft; when the upper furnace shell and the lower furnace shell are attached, the furnace shell as a whole is a semi-closed structure with two openings, and after the upper furnace shell is rotated around the rotating shaft, the furnace shell becomes an open structure.

[0016] Preferably, the inner tube is detachably connected with the rotating support assembly. The detachable connection includes but is not limited to buckle connection, clamp connection, flange connection.

[0017] Preferably, the rotating support assembly comprises a first support frame, a rotating mechanism and a second support frame. The first support frame is connected with one end of the inner tube, and the second support frame is connected with the other end of the inner tube. The rotating mechanism comprises a rotating speed controller, a transmission unit and a rotating motor. The rotating speed controller, the rotating motor and the transmission unit are connected in series. The transmission unit is arranged on the first support frame or the second support frame and connected with the inner tube.

[0018] Preferably, the device further comprises a storage feeding bin and a feeding mechanism. The discharge end of the storage feeding bin is connected with the feeding end of the inner tube through the feeding mechanism. The feeding mechanism is arranged on the base, and the storage feeding bin is arranged above the feeding mechanism. Preferably, the feeding mechanism is a gas pump type pusher or a screw type pusher.

[0019] Preferably, the device further comprises a receiving cylinder. The receiving cylinder is arranged at the discharge port of the inner tube and is connected with the inner tube.

[0020] Preferably, the device further comprises a control box, which is arranged on the base or on the ground or the experimental table surface on one side of the base; the control box is independently signal-connected with the heating assembly, the rotating support assembly, the lifting assembly and the feeding mechanism; preferably, the control box is a PLC control box.

[0021] In the utility model, the inner tube is arranged in the furnace shell, and the two ends of the inner tube penetrate through the furnace shell, and the inner spiral protrusions are arranged on the inner wall of the inner tube; after the material enters the experimental furnace, the rotating support assembly drives the inner tube to rotate around the central shaft, the material slowly moves forward under the pushing of the spiral protrusions, and meanwhile, the heating assembly is used for heating the inner tube, so that the feeding, heating and discharging are fully automated. Without manual disassembly of the experimental device, recooling or reheating operation, the experimental material is simple and easy to operate, manpower and time are saved, and the experimental efficiency is improved.

[0022] In the utility model, the lifting assembly is further arranged, the telescopic end of the telescopic rod of the lifting assembly is connected with the base, and then the movement speed of the material in the inner tube is controlled; according to the temperature requirement and the reaction progress of the material, the lifting assembly is controlled, the included angle between the base and the horizontal plane is changed, and then the residence time of the material in the inner tube is increased or reduced. When the material in the heat treatment experimental device needs to be quickly discharged, the lifting assembly is started, the telescopic rod is controlled to be elongated, one side of the base is lifted upward, the material is quickly discharged under the double actions of gravity and the rotation of the inner tube, and the experimental efficiency is improved. When the material in the heat treatment experimental device needs to prolong the heating time, the lifting assembly is started, the telescopic rod is controlled to be shortened, and one side of the base is lowered downward, so that the heating reaction time is prolonged.

[0023] In the utility model, according to the shape and size of the material used for experiment, the inner spiral protrusions of the inner tube are one or more combinations of triangle, rectangle, trapezoid, parallelogram or S shape. In addition, the height of the inner spiral protrusion is limited to achieve the best effect of smoothly pushing the material forward.

[0024] In the utility model, the spiral protrusions on the inner wall of the inner tube can be continuous or discontinuous; the continuous spiral protrusions make the material continuously move forward; the discontinuous spiral protrusions make the material stop in the inner cylinder after passing through the spiral protrusions, and then the material is pushed forward by the subsequent material; the spiral protrusions with two different structures both play the role of pushing the material forward.

[0025] In the utility model, the furnace is divided into multiple temperature intervals along the axial direction of the inner tube, and multiple heating assemblies are arranged to realize precise temperature control in multiple sections. Preferably, the furnace shell is arranged as an openable structure to facilitate the installation and rapid cooling of the inner tube. Further preferably, the inner tube and the rotating support assembly are detachably connected, and the inner tube with different spiral protrusions can be installed according to the particle size and other characteristics of the material.

[0026] In the utility model, rotation support assembly is provided with rotating speed controller, according to the experiment demand, the moving speed of material in the inner tube is controlled, and lifting assembly can be matched simultaneously, so that material moves uniformly forward in the inner tube, realizes automatic uniform feeding and discharging function, and the residence time of material in different temperature intervals in the inner tube is controlled by adjusting lifting angle and rotating speed, the degree of automation is high, manpower and time are saved.

[0027] In the utility model, the feeding unit is arranged at the feeding end of the inner tube, which better connects the storage feeding bin and the inner tube and prevents the material from being stuck between the storage feeding bin and the inner tube.

[0028] In the utility model, first, the heating temperature of each temperature interval in the hearth is set, and the temperature rising rate, lifting angle and rotating speed are adjusted, after the temperature rises to the set temperature, heat preservation is carried out for a period of time, after the heat preservation is finished, the material is sent into the inner tube from the storage feeding bin through the feeding unit, the material moves gradually to the discharging end in the inner tube along with the rotation of the inner tube, and falls into the receiving cylinder automatically after moving to the discharging port, after the material falls into the receiving cylinder, the batch of material heat treatment is finished. If there is other batch of experiment, the equipment operating parameters can be adjusted, and the experiment is carried out again after the temperature is stable for a period of time.

[0029] In the utility model, the transmission unit of the rotating mechanism can be gear transmission or chain transmission.

[0030] Compared with the prior art, the utility model has the following beneficial effects:

[0031] 1、The continuous feeding and discharging heat treatment experimental device provided by the utility model sets the spiral protrusion on the inner wall of the inner tube, the material can move forward under the action of the rotation of the inner tube, and realizes full-automatic feeding and discharging. Without manual disassembly of the experimental device, recooling or heating operation and the like, the experimental material is simple and easy to operate, manpower and time are saved, and the experimental efficiency is improved.

[0032] 2、The continuous feeding and discharging heat treatment experimental device can adjust the feeding mechanism, the lifting assembly and the rotation support assembly according to the actual movement and heating condition of the material, speed up or slow down the moving speed of the material to the discharging end, and adjust the position of the material in the inner tube, realize the heating of the material in the best temperature range in combination with different temperature intervals in the inner tube. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 The structure schematic view of the continuous feeding and discharging heat treatment experimental device provided by the utility model.

[0034] Figure 2 The structure schematic view of the lifting assembly in the continuous feeding and discharging heat treatment experimental device provided by the utility model.

[0035] Reference signs: 1: base; 2: furnace shell; 3: inner tube; 4: heating assembly; 5: rotating support assembly; 501: first support frame; 502: rotating mechanism; 503: second support frame; 6: lifting assembly; 601: telescopic rod; 602: driving motor; 7: storage feeding bin; 8: feeding mechanism; 9: receiving cylinder; 10: control box. DETAILED DESCRIPTION

[0036] The technical scheme of the utility model will be illustrated below, and the scope of protection requested by the utility model includes but is not limited to the following embodiments.

[0037] A continuous feeding and discharging heat treatment experimental device, which comprises a base 1, a furnace shell 2, an inner tube 3, a heating assembly 4 and a rotating support assembly 5. The furnace shell 2 is fixedly arranged on the base 1. The inner cavity of the furnace shell 2 is a furnace chamber, and the inner tube 3 is arranged in the furnace chamber and extends to the outside through the furnace shell 2 at both ends, and the two ends of the inner tube 3 extending to the outside are fixed on the base 1 through the rotating support assembly 5. The heating assembly 4 is arranged in the furnace chamber. The inner wall of the inner tube 3 is provided with a spiral protrusion.

[0038] Preferably, the device further comprises a lifting assembly 6. The lifting assembly 6 comprises a telescopic rod 601 and a driving motor 602. The telescopic end of the telescopic rod 601 is connected with the base 1, and the fixed end of the telescopic rod 601 is arranged on the ground or the experimental table. The driving motor 602 is arranged on the ground or the experimental table and is connected with the fixed end of the telescopic rod 601. In the vertical direction, the driving motor 602 drives the telescopic end of the telescopic rod 601 to lift up or down with the fixed end as the fulcrum, so as to lift up or down one end of the base 1 with the other end as the fulcrum.

[0039] Preferably, the protrusion height of the spiral protrusion along the radial direction of the inner tube 3 is 1-100mm, preferably 3-80mm, and more preferably 5-50mm.

[0040] Preferably, in the axial direction of the inner tube 3, the inner tube 3 body with the spiral protrusion accounts for 50%-100% of the overall length, preferably 85%-95%. Preferably, the spiral protrusion is arranged on the inner wall of the inner tube 3 in the furnace chamber.

[0041] Preferably, along the axial direction of the inner tube 3, the spiral protrusion is designed as a continuous or discontinuous multi-segment protrusion. Preferably, the spiral protrusion is designed as a discontinuous 2-30-segment protrusion.

[0042] Preferably, the axial spacing of any two adjacent spiral protrusions is less than 10%-80% of the length of the inner tube 3 body occupied by any one of the spiral protrusions, preferably 20%-60%.

[0043] Preferably, the furnace chamber in the furnace shell 2 is divided into 2-5 temperature intervals along the axial direction of the inner tube 3 according to the material flow direction, and each temperature interval is provided with an independent heating assembly 4.

[0044] Preferably, the heating assembly 4 is a resistance wire or a silicon-carbon rod, and more preferably a resistance wire.

[0045] Preferably, a temperature detection device is provided in each temperature interval of the furnace chamber.

[0046] Preferably, the furnace shell 2 is of an openable structure. Preferably, the furnace shell 2 comprises an independent upper furnace shell and a lower furnace shell, and the upper furnace shell is connected with the lower furnace shell through a rotating shaft. The upper furnace shell can rotate around the rotating shaft. When the upper furnace shell and the lower furnace shell are attached, the furnace shell 2 is of a semi-closed structure with both sides open. After the upper furnace shell is rotated around the rotating shaft, the furnace shell 2 is of an open structure.

[0047] Preferably, the inner tube 3 is detachably connected with the rotating support assembly 5. The detachable connection includes but is not limited to a buckle connection, a clamp connection, and a flange connection.

[0048] Preferably, the rotating support assembly 5 comprises a first support frame 501, a rotating mechanism 502, and a second support frame 503. The first support frame 501 is connected with one end of the inner tube 3, and the second support frame 503 is connected with the other end of the inner tube 3. The rotating mechanism 502 comprises a rotating speed controller, a transmission unit, and a rotating motor. The rotating speed controller, the rotating motor, and the transmission unit are connected in series. The transmission unit is arranged on the first support frame 501 or the second support frame 503 and connected with the inner tube 3.

[0049] Preferably, the device further comprises a storage feeding bin 7 and a feeding mechanism 8. The discharge end of the storage feeding bin 7 is connected with the feeding end of the inner tube 3 through the feeding mechanism 8. The feeding mechanism 8 is arranged on the base 1, and the storage feeding bin 7 is arranged above the feeding mechanism 8. Preferably, the feeding mechanism 8 is a gas pump type pusher or a spiral type pusher.

[0050] Preferably, the device further comprises a receiving cylinder 9. The receiving cylinder 9 is arranged at the discharge port of the inner tube 3 and connected with the inner tube 3.

[0051] Preferably, the device further comprises a control box 10, which is arranged on the base 1 or on the ground or the experimental table surface on one side of the base 1. The control box 10 is independently connected with the heating assembly 4, the rotating support assembly 5, the lifting assembly 6, and the feeding mechanism 8. Preferably, the control box 10 is a PLC control box. Example 1

[0052] A continuous feeding and discharging heat treatment experimental device, comprising a base 1, a furnace shell 2, an inner tube 3, a heating assembly 4, and a rotating support assembly 5. The furnace shell 2 is fixedly arranged on the base 1. The internal cavity of the furnace shell 2 is a furnace chamber, and the inner tube 3 is arranged in the furnace chamber and extends to the outside through the furnace shell 2 at both ends of the inner tube 3. The two ends of the inner tube 3 extending to the outside are fixed on the base 1 through the rotating support assembly 5. The heating assembly 4 is arranged in the furnace chamber. The inner wall of the inner tube 3 is provided with a spiral protrusion. Example 2

[0053] Example 1 is repeated, except that the device further comprises a lifting assembly 6. The lifting assembly 6 comprises a telescopic rod 601 and a driving motor 602. The telescopic end of the telescopic rod 601 is connected with the base 1, and the fixed end of the telescopic rod 601 is arranged on the ground or the experimental table. The driving motor 602 is arranged on the ground or the experimental table and is connected with the fixed end of the telescopic rod 601. In the vertical direction, the driving motor 602 drives the telescopic end of the telescopic rod 601 to lift up or down with the fixed end as the fulcrum, so that one end of the base 1 is lifted up or down with the other end as the fulcrum. Example 3

[0054] Example 2 is repeated, except that the radial protrusion height of the spiral protrusion along the inner tube 3 is 35mm. Example 4

[0055] Example 3 is repeated, except that in the axial direction of the inner tube 3, the inner tube 3 body with the spiral protrusion accounts for 90% of the overall length of the inner tube 3. The spiral protrusion is arranged on the inner wall of the inner tube 3 located in the furnace chamber. Example 5

[0056] Example 4 is repeated, except that in the axial direction of the inner tube 3, the spiral protrusion is designed as a multi-section protrusion that is discontinuously extended. The spiral protrusion is designed as a 15-section protrusion that is discontinuously extended. Example 6

[0057] Example 5 is repeated, except that the axial spacing of any two adjacent spiral protrusions is less than 50% of the length of the inner tube 3 body occupied by any one of the spiral protrusions. Example 7

[0058] Example 6 is repeated, except that according to the movement direction of the material, the furnace chamber in the furnace shell 2 is divided into three temperature intervals in the axial direction of the inner tube 3, and each temperature interval is provided with an independent heating assembly 4. The heating assembly 4 is a resistance wire. Each temperature interval of the furnace chamber is provided with a temperature detection device. Example 8

[0059] The same principle applies to Embodiment 7, except that the furnace shell 2 is an openable structure. The furnace shell 2 includes an independent upper furnace shell and a lower furnace shell, which are connected by a rotating shaft. The upper furnace shell can rotate around the rotating shaft. When the upper furnace shell and the lower furnace shell are in contact, the furnace shell 2 is a semi-closed structure with openings on both sides. After the upper furnace shell rotates around the rotating shaft, the furnace shell 2 becomes an open structure. Example 9

[0060] Example 8 is repeated, except that the inner tube 3 and the rotating support assembly 5 are detachably connected. The detachable connection is a snap-fit ​​connection. Example 10

[0061] The embodiment 9 is repeated, except that the rotating support assembly 5 includes a first support frame 501, a rotating mechanism 502, and a second support frame 503. The first support frame 501 is connected to one end of the inner tube 3, and the second support frame 503 is connected to the other end of the inner tube 3. The rotating mechanism 502 includes a speed controller, a transmission unit, and a rotating motor. The speed controller, rotating motor, and transmission unit are connected in series. The transmission unit is mounted on the first support frame 501 or the second support frame 503 and connected to the inner tube 3. Example 11

[0062] The same method as Embodiment 10 is used, except that the device further includes a storage and feeding hopper 7 and a feeding mechanism 8. The discharge end of the storage and feeding hopper 7 is connected to the feed end of the inner tube 3 through the feeding mechanism 8. The feeding mechanism 8 is mounted on the base 1, and the storage and feeding hopper 7 is positioned above the feeding mechanism 8. The feeding mechanism 8 is an air pump type pusher or a screw type pusher. Example 12

[0063] The same method is used in embodiment 11, except that the device also includes a receiving cylinder 9. The receiving cylinder 9 is located at the outlet of the inner tube 3 and is connected to the inner tube 3. Example 13

[0064] The same method applies to embodiment 12, except that the device further includes a control box 10, which is mounted on the base 1 or on the ground or experimental platform to one side of the base 1. The control box 10 establishes independent signal connections with the heating assembly 4, the rotating support assembly 5, the lifting assembly 6, and the feeding mechanism 8. The control box 10 is a PLC control box.

Claims

1. A continuous feed and discharge heat treatment experimental apparatus, characterized in that: The device comprises a base (1), a furnace shell (2), an inner tube (3), a heating assembly (4), and a rotating support assembly (5); wherein the furnace shell (2) is fixedly arranged on the base (1); the inner cavity of the furnace shell (2) is a furnace chamber, the inner tube (3) is arranged in the furnace chamber and the two ends of the inner tube (3) extend to the outside after penetrating through the furnace shell (2), the two ends of the inner tube (3) extending to the outside are fixed on the base (1) through the rotating support assembly (5); the heating assembly (4) is arranged in the furnace chamber; the inner wall of the inner tube (3) is provided with a spiral protrusion.

2. The apparatus of claim 1, wherein: The device further comprises a lifting assembly (6); the lifting assembly (6) comprises a telescopic rod (601) and a driving motor (602); the telescopic end of the telescopic rod (601) is connected with the base (1), and the fixed end of the telescopic rod (601) is arranged on the ground or the experimental bench surface; the driving motor (602) is arranged on the ground or the experimental bench surface and is connected with the fixed end of the telescopic rod (601); in the vertical direction, the driving motor (602) drives the telescopic end of the telescopic rod (601) to lift up or down with the fixed end as the fulcrum, so as to lift up or down one end of the base (1) with the other end as the fulcrum.

3. The apparatus of claim 2, wherein: The protrusion height of the spiral protrusion in the radial direction of the inner tube (3) is 1-100 mm; and / or In the axial direction of the inner tube (3), the tube body of the inner tube (3) with the spiral protrusion accounts for 50%-100% of the overall length.

4. The apparatus of claim 3, wherein: The protrusion height of the spiral protrusion in the radial direction of the inner tube (3) is 3-80 mm; and / or In the axial direction of the inner tube (3), the tube body of the inner tube (3) with the spiral protrusion accounts for 85%-95% of the overall length.

5. The apparatus of claim 4, wherein: The protrusion height of the spiral protrusion in the radial direction of the inner tube (3) is 5-50 mm; and / or The spiral protrusion is arranged on the inner wall of the inner tube (3) in the furnace chamber.

6. The apparatus of claim 3, wherein: Along the axial direction of the inner tube (3), the spiral protrusion is designed as a continuous or discontinuous multi-section protrusion.

7. The apparatus of claim 6, wherein: The spiral protrusion is designed as a discontinuous 2-30-section protrusion.

8. The apparatus of claim 6, wherein: The axial spacing of any two adjacent spiral protrusions is less than 10%-80% of the tube body length of the inner tube (3) occupied by any one of the spiral protrusions.

9. The apparatus of claim 8, wherein: The axial spacing of any two adjacent spiral protrusions is less than 20%-60% of the tube body length of the inner tube (3) occupied by any one of the spiral protrusions.

10. The apparatus of claim 2, wherein: According to the flow direction of the material, the furnace chamber in the furnace shell (2) is divided into 2-5 temperature intervals along the axial direction of the inner tube (3), and each temperature interval is provided with an independent heating assembly (4).

11. The apparatus of claim 10, wherein: The heating assembly (4) is a resistance wire or a silicon-carbon rod.

12. The apparatus of claim 10, wherein: Each temperature interval of the furnace chamber is provided with a temperature detection device.

13. The apparatus of any one of claims 1-12, wherein: The furnace shell (2) is a openable structure; the furnace shell (2) comprises independent upper and lower furnace shells, the upper and lower furnace shells are connected through a rotating shaft, and the upper furnace shell can rotate around the rotating shaft; when the upper and lower furnace shells are attached, the furnace shell (2) as a whole is a semi-closed structure with openings on both sides, and after the upper furnace shell rotates around the rotating shaft, the furnace shell (2) is an open structure.

14. The apparatus of any one of claims 1-12, wherein: The inner tube (3) is detachably connected with the rotating support assembly (5); the detachable connection is a buckle type connection, a clamp type connection or a flange type connection.

15. The apparatus of any one of claims 1-12, wherein: The rotating support assembly (5) comprises a first support frame (501), a rotating mechanism (502) and a second support frame (503); the first support frame (501) is connected with one end of the inner tube (3), and the second support frame (503) is connected with the other end of the inner tube (3); the rotating mechanism (502) comprises a rotating speed controller, a transmission unit and a rotating motor; the rotating speed controller, the rotating motor and the transmission unit are connected in series; the transmission unit is arranged on the first support frame (501) or the second support frame (503) and is connected with the inner tube (3).

16. The apparatus of any one of claims 1-12, wherein: The device further comprises a storage feeding bin (7) and a feeding mechanism (8); the discharge end of the storage feeding bin (7) is communicated with the feeding end of the inner tube (3) through the feeding mechanism (8); the feeding mechanism (8) is arranged on the base (1), and the storage feeding bin (7) is arranged above the feeding mechanism (8); and / or The device further comprises a receiving cylinder (9); the receiving cylinder (9) is arranged at the discharge port of the inner tube (3) and is communicated with the inner tube (3).

17. The apparatus of claim 16, wherein: The feeding mechanism (8) is a gas pump type pusher or a spiral type pusher.

18. The apparatus of claim 16, wherein: The device further comprises a control box (10), which is arranged on the base (1) or on the ground on one side of the base (1) or on the experimental table; the control box (10) is independently signal connected with the heating assembly (4), the rotating support assembly (5), the lifting assembly (6) and the feeding mechanism (8) respectively.

19. The apparatus of claim 18, wherein: The control box (10) is a PLC control box.

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