Continuous heating furnace

Abstract

The utility model discloses a continuous heating furnace which comprises a feeding spiral conveyor, a heating jacket, a roller, a cooling jacket, a front end box body assembly, a rear end box body assembly, a roller supporting device, a roller driving device, an atmosphere protection device and a spiral output device, and the roller supporting device comprises a front supporting unit and a rear supporting unit. The rear supporting unit comprises a rear supporting seat, a left sliding riding wheel and a right sliding riding wheel, annular sliding grooves are formed in the sliding riding wheels in the circumferential direction, a rear supporting ring is fixed to the outer surface of the rear end of the roller, the width of the sliding grooves is larger than the thickness of the rear supporting ring, and the left side and the right side of the rear supporting ring are arranged in the sliding grooves in the two directional riding wheels respectively. When the roller is heated and axially deforms, the rear supporting ring can axially move in the sliding groove. The width of the sliding groove is larger than the thickness of the rear supporting ring, when the roller is heated and the length of the roller is slightly increased, the rear supporting ring can axially move in the sliding groove, and the roller is prevented from being clamped by the front supporting unit and the rear supporting unit.

Description

Technical Field

[0001] The utility model relates to a continuous heating furnace, belonging to the technical field of heat treatment equipment. Background Art

[0002] For the treatment of materials, a continuous heating furnace is used, which includes a feeding device, a heating furnace, a drum, a discharging device and a cooling device. The drum is arranged in the heating furnace and driven to roll by a driving device. The drum is supported by two identical supporting devices respectively near both ends of the drum to ensure its stable rotation. The supporting device includes a base and two supporting wheels rotatably arranged on the base and located on both sides of the lower part of the drum respectively. An annular supporting groove is formed on the supporting wheel. A supporting ring is fixed on the drum. Both sides of the supporting ring are located in the supporting grooves of the two supporting wheels respectively and can roll relative to the supporting wheels. The width of the supporting groove is slightly larger than the thickness of the supporting ring. When the drum is heated by a heater in the heating furnace during use, it will deform. When the drum deforms axially, its length will increase slightly. At this time, the two supporting devices play a role in limiting the two supporting rings. The supporting devices cannot move. In this case, the supporting wheels of the two supporting devices will clamp the drum through the two supporting rings, resulting in the drum being unable to rotate normally and the entire heating furnace equipment being unable to work properly. The existing heating furnace only cools the materials when the drum conveys the materials. During the process from when the materials are output from the drum to when they are collected, the materials cannot be cooled continuously, and the cooling effect of the materials is poor. Summary of the Invention

[0003] The purpose of the utility model is to provide a continuous heating furnace to solve the technical defect that the drum of the continuous heating furnace in the prior art is clamped by the components supporting the drum when axially deforming due to heat, resulting in the equipment being unable to work properly.

[0004] To solve the above problems, the technical solution adopted by the present utility model is as follows: a continuous heating furnace, comprising a feeding screw conveyor, a heating jacket, a drum, a cooling jacket, a front end box assembly, a rear end box assembly, a drum supporting device, a drum driving device, an atmosphere protection device and a screw output device. The feeding screw conveyor is used for feeding. The heating jacket includes a furnace body and a furnace lining arranged in the furnace body. The heating jacket is divided into multiple heating zones from front to back, and independent heaters are arranged in each heating zone. The drum is arranged in the heating jacket and can rotate relative to the heating jacket. A number of stirrer plates with an angle to the drum center line are arranged on the inner wall of the drum for conveying materials backward when the drum rolls. The heaters in the heating jacket heat the materials conveyed in the drum. The front and rear ends of the drum respectively extend out of the front and rear ends of the heating jacket, and the front and rear ends of the heating jacket are hermetically connected to the outer surface of the drum. The rear end of the drum passes through the cooling jacket, and a spraying device is arranged in the cooling jacket for spraying cooling liquid onto the drum to cool the temperature of the materials. The rear end of the front end box assembly extends into the drum and is hermetically connected to the drum, and the drum can rotate relative to the front end box assembly. The feeding screw conveyor extends into the drum for adding materials to be processed into the drum. An exhaust pipe is connected to the front end box assembly for discharging the air in the drum and the flue gas generated by material processing. The rear end of the drum extends into the rear end box assembly and is hermetically connected to the rear end box assembly, and can rotate relative to the rear end box assembly. The drum supporting device includes a front support unit and a rear support unit. The front support unit is arranged between the front end box assembly and the heating jacket, and includes a front support seat and two left and right directional supporting wheels rotatably arranged on the support seat. An annular directional groove is formed in the circumferential direction on the directional supporting wheel. A front support ring is fixed on the outer surface of the front end of the drum. The left and right sides of the front support ring are respectively arranged in the directional grooves on the two directional supporting wheels and there are gaps on both sides of the directional grooves. The front support ring can roll relative to the directional supporting wheel. The rear support unit is located between the cooling jacket and the heating jacket, and includes a rear support seat and two left and right sliding supporting wheels rotatably arranged on the rear support seat. An annular sliding groove is formed in the circumferential direction on the sliding supporting wheel. A rear support ring is fixed on the outer surface of the rear end of the drum. The width of the sliding groove is greater than the thickness of the rear support ring. The left and right sides of the rear support ring are respectively arranged in the sliding grooves on the two directional supporting wheels and can rotate relative to the sliding supporting wheels. When the drum is axially deformed by heat, the rear support ring can axially move in the sliding groove. The drum driving device is arranged between the front end box assembly and the front end of the heating jacket for driving the drum to roll. The atmosphere protection device extends into the drum from the rear end box assembly for introducing a protective gas into the drum and discharging the air in the drum in the use state. The screw output device is communicated with the bottom of the rear end box assembly for outputting the materials discharged from the drum into the rear end box assembly.

[0005] As a further improvement of the present utility model, a filtering assembly is provided at the connection between the front-end box assembly and the exhaust pipe, which is used to filter the flue gas discharged from the cylinder body.

[0006] As a further improvement of the present utility model, a purging pipe A is also provided on the filtering assembly. The air outlet of the purging pipe A is located above the filter screen of the filtering assembly. The purging pipe A blows air to the filtering assembly to blow the dust on the filtering assembly back to the front-end box assembly.

[0007] As a further improvement of the present utility model, the bottom of the front-end box assembly is inclined to provide a purging pipe B, which is used to blow the dust settled in the front-end box assembly back into the drum.

[0008] As a further improvement of the present utility model, the drum driving device includes a driving motor and a speed reducer. The input shaft of the speed reducer is connected to the output shaft of the driving motor. A small gear is installed on the output shaft of the speed reducer. A large gear is sleeved and fixed on the drum. The small gear meshes with the large gear. The driving motor drives the drum to roll through the gear pair composed of the small gear and the large gear after deceleration.

[0009] As a further improvement of the present utility model, the spiral output device is inclined to increase the height of the discharge port of the spiral output device. A discharge pipe is connected to the discharge port of the spiral output device, and the discharge pipe is arranged vertically downward.

[0010] As a further improvement of the present utility model, a water-cooled jacket is provided on the shell of the spiral output device. A cooling water inlet is opened at the upper end of the water-cooled jacket and is connected to a water inlet pipe. A cooling water outlet is opened near the lower end of the water-cooled jacket and is connected to a water outlet pipe. Cooling water is introduced into the water-cooled jacket from the water inlet pipe and discharged from the water outlet pipe, which is used to cool the material conveyed in the spiral output device.

[0011] As a further improvement of the present utility model, the rotating shaft of the spiral output device is of a hollow structure and cooling water is introduced into it under the working state.

[0012] As a further improvement of the present utility model, a heat-insulating layer is provided between the furnace body and the furnace lining to reduce the heat dissipation of the heating jacket.

[0013] As a further improvement of the present utility model, a recovery water tank is provided below the cooling jacket to receive the cooling water dripped by the spraying device.

[0014] In summary, the beneficial effects of the present utility model are as follows: In the rear support unit of the drum support device of the present utility model, since the width of the sliding groove is greater than the thickness of the rear support ring, when the rear support ring rotates on the sliding idler wheel and the drum undergoes axial deformation due to heat and its length slightly increases, the rear support ring can axially move within the sliding groove, thereby avoiding the problem that the front support unit and the rear support unit clamp the axial deformation of the drum and cause the drum to fail to rotate normally when the drum undergoes axial deformation.

[0015] In the present utility model, the flue gas is discharged after being filtered by the filtration component, reducing the dust content in the exhaust air, that is, reducing environmental pollution and material loss, and improving the economic efficiency of material processing.

[0016] By arranging the purge pipeline A in the present utility model to purge the filtration component, the dust on the filtration component can be blown into the front-end box component for cleaning the filtration component and preventing blockage.

[0017] In the present utility model, the inclined structure at the bottom of the front-end box component facilitates the aggregation of dust therein, and the purge pipeline B blows the dust back into the drum, reducing material waste.

[0018] In the present utility model, after being decelerated by the speed reducer, the driving motor drives the drum to rotate through the meshing of the small gear and the large gear. The rotation of the drum is stable, and the driving motor is not affected by the heat of the drum.

[0019] The spiral output device of the present utility model is inclined, and a discharge pipe is arranged to connect the discharge port of the spiral output device, facilitating the collection of materials.

[0020] A water-cooled jacket is arranged on the spiral output device of the present utility model, which can further cool the material during the transportation of the material. Cooling water is introduced into the rotating shaft of the spiral output device to further reduce the temperature of the material.

[0021] A thermal insulation layer is arranged in the furnace body of the present utility model to reduce heat dissipation, ensure that the working environment temperature on site will not be too high, and improve safety.

[0022] The present utility model is provided with a recovery water tank to facilitate the recovery of the cooling water sprayed by the spraying device in the cooling jacket. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic structural diagram of the present utility model.

[0024] Figure 2 is a schematic diagram showing the drum and the support device in the present utility model.

[0025] Among them: 1. Feed screw conveyor; 2. Heating jacket; 3. Furnace body; 4. Furnace lining; 5. Heater; 6. Drum; 7. Stirring plate; 8. Cooling jacket; 9. Front-end box assembly; 10. Exhaust pipe; 11. Rear-end box assembly; 12. Front support unit; 13. Rear support unit; 14. Front support seat; 15. Directional supporting wheel; 16. Directional groove; 17. Front support ring; 18. Rear support seat; 19. Sliding supporting wheel; 20. Sliding groove; 21. Rear support ring; 22. Drum driving device; 23. Atmosphere protection device; 24. Screw output device; 25. Filter assembly; 26. Purge pipe A; 27. Purge pipe B; 28. Driving motor; 29. Reducer; 30. Pinion; 31. Gear; 32. Discharge pipe; 33. Water-cooling jacket; 34. Water inlet pipe; 35. Water outlet pipe; 36. Heat-insulating layer. Detailed implementation manners

[0026] The following further describes the detailed implementation manners of the present utility model with reference to the accompanying drawings. Embodiment 1

[0027] As Figure 1 shown, the continuous heating furnace includes a feed screw conveyor 1, a heating jacket 2, a drum 6, a cooling jacket 8, a front-end box assembly 9, a rear-end box assembly 11, a drum supporting device, a drum driving device 22, an atmosphere protection device 23 and a screw output device 24. The feed screw conveyor 1 is horizontally arranged and used for adding materials to be processed into the drum 6.

[0028] As Figure 1 shown, the heating jacket 2 includes a furnace body 3 and a furnace lining 4 arranged in the furnace body 3. The cross-sectional shape of the furnace body 3 is rectangular. A heat-insulating layer 36 with a thickness of 250 mm is arranged between the furnace lining 4 and the inner surface of the furnace body 3 to reduce the heat dissipation of the heating jacket 2, keep the temperature in the heating jacket 2 constant, and have no impact on the surrounding environment and safety hazards. The heat-insulating layer 36 is made of existing materials, specifically, a silica-aluminum fiber blanket is used. The heat-insulating layer 36 is prior art. The heating jacket 2 is divided into multiple heating zones from front to back, and an independently controlled heater 5 is arranged in each heating zone. In this embodiment, the number of heating zones is six.

[0029] As Figure 1 shown, the drum 6 is arranged in the heating jacket 2 and can rotate relative to the heating jacket 2. The drum 6 is made by rolling and welding SUS310S stainless steel with a plate thickness of 12 mm. The outer diameter of the drum 6 is 1000 mm. The inner wall of the drum 6 is finely processed to make the roughness of the inner wall of the drum 6 less than or equal to Ra6.3 μm. A number of stirring plates 7 with an included angle with the center line of the drum 6 are welded on the inner wall of the drum 6. The height of the stirring plate 7 is 100 mm, and the stirring plate 7 is used for conveying materials backward when the drum 6 rolls.

[0030] As Figure 1 shown, the heater 5 in the heating jacket 2 heats the material conveyed in the drum 6. In this embodiment, the heater 5 is located below the drum 6. A plurality of heaters 5 are arranged in each heating zone. The heater 5 uses an electric heating tube. The power of the electric heating tube in each heating zone is 40 Kw, and the drum 6 is radiantly heated. In this embodiment, a separate switch is provided for each heating unit in the heating jacket 2, and the electric heating tube can be separately withdrawn and replaced after it is damaged. In this embodiment, a temperature measurement point is arranged in each heating zone in the heating jacket 2 to measure the air temperature inside the heating jacket 2 and perform temperature control according to the measured temperature. A two-core thermocouple is arranged at the measurement point. The two-core thermocouple has the functions of temperature control and over-temperature protection. A ceramic sleeve is arranged at the connection between the two-core thermocouple and the heating jacket 2 to improve the insulation reliability between the two-core thermocouple and the heating jacket 2.

[0031] As Figure 1 shown, the front and rear ends of the drum 6 respectively extend out of the front and rear ends of the heating jacket 2, and the front and rear ends of the heating jacket 2 are hermetically connected to the outer surface of the drum 6. The sealing structure between the drum 6 and the heating jacket 2 is prior art and will not be described in detail in this embodiment. The rear end of the drum 6 passes through the cooling jacket 8 and extends out from the rear end of the cooling jacket 8. A spraying device is arranged in the cooling jacket 8 for spraying a cooling liquid onto the drum 6 to cool the temperature of the material. The spraying device includes a cooling water pipe arranged in the cooling jacket 8 and a plurality of nozzles arranged on the cooling water pipe. Cooling water is introduced into the cooling water pipe. An explosion-proof flow switch is arranged on the cooling water pipe, and a manual valve is arranged at the water inlet of the cooling water pipe. The cooling water is sprayed from the nozzles onto the surface of the drum 6, exchanges heat with the drum 6, and reduces the temperature of the drum 6 in the cooling jacket 8. The drum 6 then exchanges heat with the material inside it, thereby reducing the temperature of the material. In this embodiment, a recovery water tank (not shown in the figure) is arranged below the cooling jacket 8 for receiving the cooling water dripped by the spraying device. The temperature of the cooling water used in this embodiment does not exceed 32 °C, and the flow rate of the cooling water is about 20 m 3 / h.

[0032] As Figure 1As shown, the rear end of the front-end box assembly 9 extends into the drum 6 and is sealedly connected to the drum 6, and the drum 6 can rotate relative to the front-end box assembly 9. The sealing structure between the drum 6 and the front-end box assembly 9 is prior art and will not be elaborated in this embodiment. The feeding screw conveyor 1 extends into the front end of the drum 6 in the front-end box assembly 9, and the discharge port of the feeding screw conveyor 1 is located inside the drum 6 for adding the material to be processed into the drum 6. The housing of the screw conveyor 1 is sealedly connected to the front-end box assembly 9, and specifically, a sealing ring or other sealing means can be used. This sealing structure is also prior art. In this embodiment, an exhaust duct 10 is connected to the front-end box assembly 9 for discharging the air inside the drum 6 before processing the material and discharging the flue gas generated by heating the material during the material processing. The inner diameter of the exhaust duct 10 is 200 mm, and it includes a vertical part and a horizontal part. One end of the horizontal part is communicated with the top end of the vertical part. The bottom end of the vertical part of the exhaust duct 10 is communicated with the front-end box assembly 9, and the other end of the horizontal part of the exhaust duct 10 extends outside the explosion-proof workshop, so as to ensure that the high-temperature flue gas generated during the material heating process does not enter the workshop space. The lengths of the horizontal part and the vertical part of the exhaust duct 10 are 5000 mm and 4100 mm respectively.

[0033] As Figure 1 shown, the rear end of the drum 6 extends into the rear-end box assembly 11 and is sealedly connected to the rear-end box assembly 11, and it can rotate relative to the rear-end box assembly 11. The sealing structure between the drum 6 and the rear-end box assembly 11 is also prior art. While the drum 6 is rolling, the material that has undergone heat treatment and preliminary cooling is discharged into the rear-end box assembly 11.

[0034] As Figure 1 and Figure 2As shown in the figure, the drum support device includes a front support unit 12 and a rear support unit 13. The front support unit 12 is arranged between the front-end box assembly 9 and the heating jacket 2, and is used to support the drum 6 from the front end of the drum 6. The front support unit 12 includes a front support base 14 and two left and right directional supporting wheels 15 rotatably arranged on the front support base 14. The directional supporting wheels 15 are rotatably connected to the front support base 14 by a front supporting wheel shaft, and the front supporting wheel shaft is parallel to the center line of the drum 6. An annular directional groove 16 is formed in the circumferential direction on the directional supporting wheel 15. A front support ring 17 is fixed on the outer surface of the drum 6 near the front end. The front support ring 17 can be fixedly welded to the drum 6. The left and right sides of the front support ring 17 are respectively arranged in the directional grooves 16 on the two directional supporting wheels 15 and have a gap with the two sides of the directional groove 16. In this embodiment, the thickness of the front support ring 17 is slightly smaller than the width of the directional groove 16 to ensure that the front support ring 17 can roll relative to the directional supporting wheel 15. The rear support unit 13 is located between the cooling jacket 8 and the heating jacket 2 and is used to support the drum 6 from the rear. The rear support unit 13 includes a rear support base 18 and two left and right sliding supporting wheels 19 rotatably arranged on the rear support base 18. The sliding supporting wheels 19 are rotatably connected to the rear support base 18 by a rear supporting wheel shaft. An annular sliding groove 20 is formed in the circumferential direction on the sliding supporting wheel 19. A rear support ring 21 is fixed on the outer surface of the rear end of the drum 6. The rear support ring 21 is fixedly welded to the drum 6. The width of the sliding groove 20 is larger than the thickness of the rear support ring 21. The left and right sides of the rear support ring 21 are respectively arranged in the sliding grooves 20 on the two directional supporting wheels 15 and can rotate relative to the sliding supporting wheel 19. Since the thickness of the rear support ring 21 is smaller than the width of the sliding groove 20, when the drum 6 undergoes axial deformation due to heat, the rear support ring 21 can axially move in the sliding groove 20 to absorb the expansion amount of the drum 6 and will not cause a clamping phenomenon, enabling the equipment to operate normally.

[0035] As Figure 1 shown in the figure, the drum driving device 22 is arranged between the front-end box assembly 9 and the front end of the heating jacket 2 and is used to drive the drum 6 to roll. The drum driving device 22 includes a driving motor 28 and a speed reducer 29. The input shaft of the speed reducer 29 is connected to the output shaft of the driving motor 28. A small gear 30 is installed on the output shaft of the speed reducer 29. A large gear 31 is sleeved and fixed on the drum 6. The small gear 30 meshes with the large gear 31. Through gear transmission, the drum 6 is driven to rotate clockwise. The transmission method is that the small gear 30 on the speed reducer drives the large gear 31 on the drum 6 to make the drum 6 rotate. In this embodiment, the rotational speed of the cylinder 6 is 1 - 2.5 r / min. The driving motor 28 can also make the drum 6 rotate counterclockwise. The advantages of this embodiment are stable operation, soft start, stepless adjustable rotational speed, the driving motor is not affected by heat, and the noise is low. In this embodiment, the power of the driving motor is 4 Kw and the frequency is 5 - 100 Hz.

[0036] As Figure 1 shown, the atmosphere protection device 23 extends from the rear-end box body assembly 11 into the drum 6, and is used to introduce protective gas into the drum 6 and discharge the air in the drum 6 in the use state. The atmosphere protection device 23 in this embodiment is a protective gas pipe, which is fixed to the rear-end box body assembly 11 and extends forward from the rear end of the drum 6 into the drum 6. The protective gas pipe is arranged along the central line direction of the drum 6. When in use, protective gas is introduced into the drum 6 so that the material is heated under a protective atmosphere. The intake flow rate of the protective gas pipe is about 20m 3 / h, and the pressure in the drum 6 is controlled to be about 50 - 100 Pa. Preferably, in this embodiment, a cover plate is provided on the rear-end box body assembly 11, and the protective gas pipe is fixed to the cover plate. The cover plate can be removed to enter the drum for maintenance.

[0037] As Figure 1 shown, the spiral output device 24 is communicated with the bottom of the rear-end box body assembly 11 and is used to output the material discharged from the drum 6 into the rear-end box body assembly 11. The spiral output device 24 in this embodiment is inclined to increase the height of the discharge port of the spiral output device 24. The inclined setting of the spiral output device 24 can be realized by setting a separate output support. A discharge pipe 32 is flange-connected to the discharge port of the spiral output device 24, and the discharge pipe 32 is arranged vertically downward to facilitate the collection of the material. In this embodiment, a material temperature measuring thermocouple is provided on the discharge pipe 32 to measure the temperature of the material conveyed by the spiral output device 24. The discharge pipe 32 is made of a stainless steel pipe with an inner diameter of 100 mm. A water-cooled jacket 33 is provided on the shell of the spiral output device 24. The water-cooled jacket 33 is sleeved on the shell of the spiral output device 24, and a cooling water channel is formed between the water-cooled jacket 33 and the shell of the spiral output device 24. A cooling water inlet communicating with the cooling water channel is opened at the upper end of the water-cooled jacket 33 and is connected with a water inlet pipe 34. A cooling water outlet communicating with the cooling water channel is opened near the lower end of the water-cooled jacket 33 and is connected with a water outlet pipe 35. Cooling water is introduced into the water-cooled jacket 33 from the water inlet pipe 34 and discharged from the water outlet pipe 35 to cool the material conveyed in the spiral output device 24. The spiral output device 24 in this embodiment can realize the functions of material conveying, crushing and cooling. The spiral output device 24 is driven by an explosion-proof variable-frequency drive motor. In this embodiment, the temperature of the finally output material can be controlled below 100°C.

[0038] As Figure 1As shown in the figure, in this embodiment, a filtering component 25 is provided at the connection between the front-end box component 9 and the exhaust pipe 10, which is used to filter the flue gas discharged from the drum 6. The filter screen of the filtering component 25 is a sintered filter screen, made of SUS361L stainless steel, with a filtration accuracy of 10 μm. A purging pipe A 26 is also provided on the filtering component 25. The air outlet of the purging pipe A 26 is located above the filter screen of the filtering component 25. The purging pipe A 26 is connected to high-pressure gas and blows air towards the filtering component 25, which is used to blow the dust on the filtering component 25 back into the front-end box component 9. Embodiment 2

[0039] This embodiment is a further improvement on Embodiment 1. Compared with Embodiment 1, the rotating shaft of the spiral output device 24 in this embodiment is of a hollow structure and is filled with cooling water in the working state. In this embodiment, a belt or chain is used to connect the rotating shaft of the spiral output device 24 to the motor, and a rotary joint is used to connect the cold water pipe at the end of the rotating shaft for introducing cooling water into the rotating shaft. The structures of the remaining parts in this embodiment are the same as those in Embodiment 1, and specific details can be referred to Embodiment 1, so this embodiment will not be elaborated. Embodiment 3

[0040] As Figure 1 shown in the figure, this embodiment is a further improvement based on Embodiment 1 or Embodiment 2. Compared with Embodiment 1 or Embodiment 2, the bottom of the front-end box component 9 in this embodiment is inclined, and a purging pipe B 27 is provided inside the front-end box component 9, which is used to blow the dust settled in the front-end box component 9 back into the drum 6. The structures of the remaining parts in this embodiment are the same as those in Embodiment 1 or Embodiment 2, and specific details can be referred to Embodiment 1 or Embodiment 2, so this embodiment will not be elaborated.

[0041] Parts not specifically described in the above specification are all prior art or can be achieved through prior art. Moreover, the specific implementation cases described in this utility model are only the preferred implementation cases of the present invention, and are not used to limit the implementation scope of the present utility model. That is, equivalent changes and modifications made according to the content within the scope of the patent of the present utility model should all be regarded as the technical scope of the present utility model.

Claims

1. Continuous reheating furnace, characterized in that: including a feeding screw conveyor (1) for feeding materials; a heating jacket (2) including a furnace body (3) and a furnace lining (4) arranged in the furnace body (3). The heating jacket (2) is divided into multiple heating zones from front to back, and independent heaters (5) are arranged in each heating zone; a drum (6) arranged in the heating jacket (2) and rotatable relative to the heating jacket (2). A number of stir-frying plates (7) forming an angle with the center line of the drum (6) are arranged on the inner wall of the drum (6) for conveying materials backward when the drum (6) rolls. The heaters (5) in the heating jacket (2) heat the materials conveyed in the drum (6). The front and rear ends of the drum (6) respectively extend out of the front and rear ends of the heating jacket (2), and the front and rear ends of the heating jacket (2) are hermetically connected to the outer surface of the drum (6); a cooling jacket (8) through which the rear end of the drum (6) passes. A spraying device is arranged in the cooling jacket (8) for spraying a cooling liquid onto the drum (6) to cool the temperature of the materials; a front-end box assembly (9) whose rear end extends into the drum (6) and is hermetically connected to the drum (6), and the drum (6) can rotate relative to the front-end box assembly (9). The feeding screw conveyor (1) extends into the drum (6) for adding materials to be processed into the drum (6). An exhaust pipe (10) is connected to the front-end box assembly (9) for discharging the air in the drum (6) and the flue gas generated by material processing; a rear-end box assembly (11) into which the rear end of the drum (6) extends and is hermetically connected to the rear-end box assembly (11), and the drum (6) can rotate relative to the rear-end box assembly (11); Drum support device, which includes a front support unit (12) and a rear support unit (13). The front support unit (12) is arranged between the front-end box assembly (9) and the heating jacket (2), and it includes a front support seat (14) and two left and right orientation supporting wheels (15) rotatably arranged on the front support seat (14). An annular orientation groove (16) is formed on the circumference of the orientation supporting wheel (15). A front support ring (17) is fixed on the outer surface of the front end of the drum (6). The left and right sides of the front support ring (17) are respectively arranged in the orientation grooves (16) on the two orientation supporting wheels (15) and there are gaps on both sides of the orientation groove (16). The front support ring (17) can roll relative to the orientation supporting wheel (15). The rear support unit (13) is located between the cooling jacket (8) and the heating jacket (2), and it includes a rear support seat (18) and two left and right sliding supporting wheels (19) rotatably arranged on the rear support seat (18). An annular sliding groove (20) is formed on the circumference of the sliding supporting wheel (19). A rear support ring (21) is fixed on the outer surface of the rear end of the drum (6). The width of the sliding groove (20) is greater than the thickness of the rear support ring (21). The left and right sides of the rear support ring (21) are respectively arranged in the sliding grooves (20) on the two sliding supporting wheels (19) and can rotate relative to the sliding supporting wheel (19). When the drum (6) undergoes axial deformation due to heat, the rear support ring (21) can axially move in the sliding groove (20). Drum drive device (22), which is arranged between the front-end box assembly (9) and the front end of the heating jacket (2) and is used to drive the drum (6) to roll; Atmosphere protection device (23), which extends from the rear-end box assembly (11) into the drum (6) and is used to introduce a protective gas into the drum (6) and discharge the air in the drum (6) in the use state; Screw output device (24), which is communicated with the bottom of the rear-end box assembly (11) and is used to output the materials discharged from the drum (6) into the rear-end box assembly (11).

2. The continuous heating furnace according to claim 1, wherein: A filter assembly (25) is arranged at the connection between the front-end box assembly (9) and the exhaust pipe (10) and is used to filter the flue gas discharged from the drum (6).

3. The continuous reheating furnace according to claim 2, wherein: A purge pipe A (26) is further arranged on the filter assembly (25). The air outlet of the purge pipe A (26) is located above the filter screen of the filter assembly (25). The purge pipe A (26) blows air to the filter assembly (25) to blow the dust on the filter assembly (25) back into the front-end box assembly (9).

4. The continuous heating furnace according to claim 1, wherein: The bottom of the front-end box assembly (9) is inclined and a purge pipe B (27) is arranged, which is used to blow the dust settled in the front-end box assembly (9) back into the drum (6).

5. The continuous heating furnace according to claim 1, characterized in that: The drum drive device (22) includes a drive motor (28) and a speed reducer (29). The input shaft of the speed reducer (29) is connected to the output shaft of the drive motor (28). A pinion gear (30) is installed on the output shaft of the speed reducer (29). A large gear (31) is sleeved and fixed on the drum (6). The pinion gear (30) meshes with the large gear (31). The drive motor (28) drives the drum (6) to roll through the gear pair composed of the pinion gear (30) and the large gear (31) after deceleration.

6. The continuous heating furnace according to claim 1, characterized in that: The screw output device (24) is inclined to increase the height of the discharge port of the screw output device (24). A discharge pipe (32) is connected to the discharge port of the screw output device (24), and the discharge pipe (32) is arranged vertically downward.

7. The continuous heating furnace according to claim 6, characterized in that: A water-cooled jacket (33) is provided on the housing of the screw output device (24). A cooling water inlet is opened at the upper end of the water-cooled jacket (33) and a water inlet pipe (34) is connected. A cooling water outlet is opened near the lower end of the water-cooled jacket (33) and a water outlet pipe (35) is connected. Cooling water is introduced into the water-cooled jacket (33) from the water inlet pipe (34) and discharged from the water outlet pipe (35) to cool the material conveyed in the screw output device (24).

8. The continuous reheating furnace according to claim 7, characterized in that: The rotating shaft of the screw output device (24) is of a hollow structure and cooling water is introduced during use.

9. The continuous reheating furnace according to claim 1, wherein: A heat insulation layer (36) is provided between the furnace body (3) and the furnace lining (4) to reduce the heat dissipation of the heating jacket (2).

10. The continuous heating furnace according to claim 1, characterized in that: A recovery water tank is provided below the cooling jacket (8) to receive the cooling water dripped by the spraying device.

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