Double-layer regeneration drying roller

Abstract

The double-layer regeneration drying drum comprises an inclined inner drum and an inclined outer drum, the inclined inner drum is provided with a first space used for containing regeneration coarse materials, the inclined outer drum is arranged outside the inclined inner drum in a sleeving mode, and a second space used for containing regeneration fine materials is formed between the inclined inner drum and the inclined outer drum; the heating assembly is used for heating the regenerated coarse material; the driving assembly is used for driving the inclined outer barrel to rotate; the regeneration drying roller is of a double-layer design, regenerated fine materials and regenerated coarse materials are separated, and the problems that the regenerated fine materials are excessively adhered to the roller wall in the heating process, so that the temperature of regenerated tail gas is too high, and fire is caused are solved; besides, the heating assembly is used for directly heating the recycled coarse material, the cylinder wall of the inclined inner cylinder is heated through heat conduction, the heated cylinder wall heats the recycled fine material through heat conduction, and the temperature of the heated recycled fine material is low, so that asphalt in the recycled fine material cannot reach the most viscous state, and the viscosity is reduced; and the tail gas emission temperature is further reduced.

Description

Technical Field

[0001] The present application relates to the field of asphalt technology, and in particular to a double-layer regeneration drying drum. Background Art

[0002] With the rapid development of transportation infrastructure construction, the demand for asphalt mixtures has increased year by year. However, traditional asphalt mixing equipment mainly relies on virgin materials, and the proportion of waste asphalt materials added is low, resulting in low utilization rate, which not only causes resource waste, but also increases production costs and environmental pollution. In order to avoid resource waste, the proportion of recycled materials should be increased.

[0003] Recycled aggregate includes recycled coarse aggregate and recycled fine aggregate. The recycled fine aggregate contains asphalt. The existing technology is to transport the recycled aggregate to a regeneration drying drum and heat it with a heater. However, when the proportion of recycled aggregate increases, the proportion of recycled fine aggregate also increases accordingly, that is, the asphalt content in the recycled fine aggregate also increases. When the heater is heated, the viscosity of the asphalt increases and it will stick to the wall of the regeneration drying drum, resulting in a reduction in the diameter of the regeneration drying drum, and a smaller range of tumbling of the recycled aggregate in the regeneration drying drum, resulting in incomplete heating of the recycled aggregate, while the heat supply of the heater remains unchanged, resulting in excessively high exhaust gas temperature, which can lead to major accidents such as fire or even explosion. Summary of the invention

[0004] In view of the above defects or deficiencies in the prior art, the present application aims to provide a double-layer regeneration drying drum, comprising:

[0005] An inclined inner cylinder, wherein the inclined inner cylinder has a first space therein, the first space is used to place the recycled coarse material, and the direction of the extended axis of the inclined inner cylinder is the first direction;

[0006] An inclined outer cylinder, wherein the inclined outer cylinder is sleeved outside the inclined inner cylinder, a second space is provided between the inclined outer cylinder and the inclined inner cylinder, the second space is used to place recycled fine material, the direction of the axis extension line of the inclined outer cylinder is the second direction, the first direction is parallel to the second direction, wherein the recycled fine material contains asphalt;

[0007] A heating component, which is arranged on one side of the highest end of the inclined inner cylinder, and is used to heat the regenerated coarse material and heat the cylinder wall of the inclined inner cylinder by heat conduction, and the heated cylinder wall of the inclined inner cylinder then heats the regenerated fine material by heat conduction;

[0008] A driving assembly is disposed outside the inclined outer cylinder and is used to drive the inclined outer cylinder to drive the inclined inner cylinder to rotate, and the extension line direction of the rotation axis is parallel to the first direction.

[0009] According to the technical solution provided in the embodiment of the present application, both the first space and the second space are provided with a plurality of copying plate groups along the axial direction of the inclined inner cylinder or the inclined outer cylinder, each of the copying plate groups includes a plurality of copying plate parts distributed in an array in the circumferential direction, and the copying plate parts of two adjacent copying plate groups are staggered.

[0010] According to the technical solution provided in the embodiment of the present application, each of the scooping plate parts includes a plurality of rake teeth distributed along the axis, one end of each of the rake teeth is connected to the inner wall of the inclined inner cylinder or the inner wall of the inclined outer cylinder, and the other end is bent in the same direction as the rotation direction of the inclined outer cylinder.

[0011] According to the technical solution provided in the embodiment of the present application, one end of the rake tooth away from the inner wall of the inclined inner cylinder or the inclined outer cylinder is a free end, and the free end is provided with a cleaning piece, which is used to clean the side walls of the rake teeth, the outer wall and inner wall of the inclined inner cylinder, and the inner wall of the inclined outer cylinder.

[0012] According to the technical solution provided in the embodiment of the present application, an anti-wear component is provided in the first space near the heating component side, and the anti-wear component is used to prevent the recycled coarse material from rubbing against the inner wall of the inclined inner cylinder.

[0013] According to the technical solution provided in the embodiment of the present application, the anti-wear assembly includes a plurality of anti-wear portions arranged axially along the inclined inner cylinder, each of the anti-wear portions includes a plurality of anti-wear parts distributed in a circumferential array, and a third space is formed between each of the anti-wear parts and the inner wall of the inclined inner cylinder, and the cross-section of the third space is fan-shaped.

[0014] According to the technical solution provided in the embodiment of the present application, it also includes a base, and the driving assembly includes a transmission part and a driving part, the transmission part includes two steel rings sleeved on the outer wall of the inclined outer cylinder, and the two steel rings are distributed along the axial direction of the inclined outer cylinder; the transmission part also includes a transmission roller group arranged corresponding to each of the steel rings, and each of the transmission roller groups includes two transmission rollers arranged on both sides of the extension line of the axis of the inclined outer cylinder along a third direction, the third direction is perpendicular to the first direction, and the extension line direction of the axis of each transmission roller is parallel to the first direction, and each of the steel rings is tangent to the two corresponding transmission rollers; the driving part includes a driving motor for driving the transmission rollers to rotate.

[0015] According to the technical solution provided in the embodiment of the present application, there is a first gap between the inner wall of the steel ring and the outer wall of the inclined outer cylinder, and a plurality of elastic sheets are arranged in the first gap, one end of the elastic sheet is connected to the outer wall of the inclined outer cylinder, and the other end is connected to the inner wall of the steel ring.

[0016] According to the technical solution provided in the embodiment of the present application, the inclined inner cylinder is conical at the end close to the heating component.

[0017] According to the technical solution provided in the embodiment of the present application, the cleaning piece includes a cleaning chain having one end connected to the free end, the length of the cleaning chain arranged in the first space is greater than the distance from the free end to the inner wall of the inclined inner cylinder, the length of the cleaning chain arranged in the second space is greater than the distance from the free end to the outer wall of the inclined inner cylinder, and greater than the distance from the free end to the inner wall of the inclined outer cylinder.

[0018] In summary, the present application proposes a double-layer regeneration drying drum, comprising an inclined inner cylinder having a first space for placing regenerated coarse material and an inclined outer cylinder sleeved thereon, with a second space between the inclined inner cylinder and the inclined outer cylinder, in which regenerated fine material can be placed; it also includes a heating component for heating the regenerated coarse material, and a driving component for driving the inclined outer cylinder to drive the inclined inner cylinder to rotate; the regeneration drying drum of the present application is a double-layer design, which separates the regenerated fine material from the regenerated coarse material, avoiding the problem that the regenerated fine material sticks to the cylinder wall, resulting in the recycled material not being fully heated; in addition, the regenerated coarse material is directly heated by the heating component, and the cylinder wall of the inclined inner cylinder is heated by heat conduction, and the heated cylinder wall then heats the regenerated fine material by heat conduction, and the temperature of the heated regenerated fine material is relatively low, so that the asphalt in the regenerated fine material cannot reach the most viscous state, thereby reducing the viscosity and further reducing the temperature of the exhaust gas emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the structure of a regenerated drying drum provided in an embodiment of the present application;

[0020] Figure 2 for Figure 1 Cross-sectional view of AA in the middle;

[0021] Figure 3 for Figure 1 Cross-section of the middle BB;

[0022] Figure 4 for Figure 1 Cross-sectional view of CC.

[0023] The text annotations in the figure represent:

[0024] 1. Inclined inner cylinder; 11. First space; 12. Regenerated coarse material inlet; 2. Inclined outer cylinder; 21. Second space; 22. Regenerated fine material inlet; 3. Connecting frame; 31. Radiating part; 32. Reinforcement part; 4. Heating component; 5. Smoke box; 6. Driving component; 61. Transmission part; 611. Steel ring; 612. Transmission roller; 613. Bearing; 614. Elastic sheet; 62. Driving part; 7. Lifting plate group; 71. Lifting plate part; 711. Rake teeth; 712. Free end; 713. Cleaning part; 8. Anti-wear component; 81. Anti-wear part; 811. Inclined plate; 82. Third space; 9. Base. DETAILED DESCRIPTION

[0025] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It is also necessary to explain that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0026] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0027] As mentioned in the background technology, the present application proposes a double-layer regeneration drying drum, comprising:

[0028] An inclined inner cylinder 1, wherein the inclined inner cylinder 1 has a first space 11, the first space 11 is used to place recycled coarse materials, and the direction of the extended axis of the inclined inner cylinder 11 is the first direction;

[0029] Among them, Figure 1 As shown, the left end of the inclined inner cylinder 1 is higher and the right end is lower, the first direction forms a first angle with the horizontal direction, and the opening of the first angle faces the left side;

[0030] An inclined outer cylinder 2, wherein the inclined outer cylinder 2 is sleeved outside the inclined inner cylinder 1, and a second space 21 is provided between the inclined outer cylinder 2 and the inclined inner cylinder 1, wherein the second space 21 is used to place recycled fine material, and the direction of the axis extension line of the inclined outer cylinder 2 is the second direction, and the first direction is parallel to the second direction, wherein the recycled fine material contains asphalt;

[0031] Optionally, the inclined outer cylinder 2 and the inclined inner cylinder 1 are coaxially arranged; the two ends of the inclined inner cylinder 1 and the inclined outer cylinder 2 are fixedly connected by a connecting frame 3, the connecting frame 3 includes a radiation portion 31 and a reinforcement portion 32, the radiation portion 31 includes a plurality of connecting rods radiating outward from the end surface of the inclined inner cylinder 1 to the end surface of the inclined outer cylinder 2, and the reinforcement portion 32 includes a reinforcement ring for connecting all the connecting rods;

[0032] A heating component 4, which is arranged on one side of the highest end of the inclined inner cylinder 1, and is used to heat the regenerated coarse material and heat the cylinder wall of the inclined inner cylinder 1 by heat conduction, and the heated cylinder wall of the inclined inner cylinder 1 then heats the regenerated fine material by heat conduction;

[0033] Among them, a closing plate is provided on the outer side of the connecting frame 3 near the heating component 4, and the closing plate is used to close the left side of the inclined outer cylinder 2 and the inclined inner cylinder 1, and a regeneration coarse material inlet 12 connected to the first space 11 is provided on the closing plate, and a regeneration fine material inlet 22 connected to the second space 21 is provided on the upper left of the inclined outer cylinder 2; a flue gas box 5 is provided at the right end of the inclined outer cylinder 2 and the inclined inner cylinder 1, and a gas storage space is provided in the flue gas box 5, and the right ends of the inclined outer cylinder 2 and the inclined inner cylinder 1 extend into the flue gas box 5, and the gas storage space is used to store the regeneration fine material and the regeneration coarse material generated after heating flue gas; optionally, the heating component 4 can heat the air in the first space 11 by flame, and then heat the regenerated coarse material by hot air, or heat the regenerated coarse material by thermal radiation. Generally, the temperature of the flame is 1000°, and the temperature of the regenerated coarse material after heating is 150-160°. The temperature of the wall of the inclined inner cylinder 1 after heating is 300-400°. The temperature of the regenerated fine material after heating can reach 100-110°. The regenerated material contains more asphalt, which is the most viscous at 120-130°. Therefore, the viscosity of the regenerated coarse material can be reduced, and the viscosity of the regenerated fine material can also be reduced.

[0034] The driving assembly 6 is arranged outside the inclined outer cylinder 2 and is used to drive the inclined outer cylinder 2 to drive the inclined inner cylinder 1 to rotate, and the extension line direction of the rotation axis is parallel to the first direction.

[0035] The regenerated drying drum of the present application is of double-layer design, which separates the regenerated fine material from the regenerated coarse material, avoiding the problem that the regenerated fine material is coated on the drum wall after heating, resulting in insufficient heating of the regenerated material; in addition, the regenerated coarse material is directly heated by the heating component 4, and the regenerated fine material is indirectly heated. The temperature of the heated regenerated fine material is relatively low, so that the asphalt in the regenerated fine material cannot reach the most viscous state, thereby reducing the viscosity and further reducing the temperature of the exhaust gas emissions.

[0036] In a preferred embodiment, both the first space 11 and the second space 21 are provided with a plurality of copying plate groups 7 axially along the inclined inner cylinder 1 or the inclined outer cylinder 1, each copying plate group 7 includes a plurality of copying plate portions 71 circumferentially arranged in an array, and the copying plate portions 71 of two adjacent copying plate groups 7 are staggered.

[0037] In the current technology, the regeneration drying drum is provided with a lifting plate. When the regeneration drying drum rotates, the lifting plate can lift the regenerated aggregate to form a material curtain, and heat it through a heater; however, if the proportion of the regenerated aggregate increases, the asphalt content in the regenerated aggregate increases. After being heated by the burner, the asphalt will stick to the lifting plate, which will reduce the diameter inside the drum and reduce the output. In addition, the lifting plate cannot play the role of lifting the material, and the regenerated aggregate is not burned and heated thoroughly, while the heat supply of the burner remains unchanged, making the exhaust gas temperature too high. The present application isolates the regenerated fine material and the regenerated coarse material for heating, avoiding the influence of the asphalt in the regenerated fine material on the lifting plate.

[0038] In a preferred embodiment, each of the scooping plate portions 71 includes a plurality of rake teeth 711 distributed along the axis, one end of each of the rake teeth 711 is connected to the inner wall of the inclined inner cylinder 1 or the inner wall of the inclined outer cylinder 2, and the other end is bent in the same direction as the rotation direction of the inclined outer cylinder 2.

[0039] Among them, Figure 1 and Figure 2 As shown, a plurality of mounting rings are provided on the inner wall of the inclined inner cylinder 1 or the inclined outer cylinder 2 along its axial direction, and each of the rake teeth 711 includes a vertical portion fixed on the mounting ring at one end, a transition portion connected to the end of the vertical portion away from the mounting ring, and a curved portion connected to the end of the transition portion away from the vertical portion, and the vertical portion is perpendicular to the tangent direction of the mounting ring; if the driving assembly 6 drives the inclined outer cylinder 2 and the inclined inner cylinder 1 to rotate counterclockwise, the transition portion and the curved portion are both bent counterclockwise, so when the inclined outer cylinder 2 drives the inclined inner cylinder 1 to rotate at a high speed, the regenerated coarse material or the regenerated fine material in the first space 11 or the second space 21 can be lifted up to form a material curtain; wherein, the bending curvature of the transition portion is smaller than the bending curvature of the curved portion.

[0040] In a preferred embodiment, the end of the rake tooth 711 away from the inner wall of the inclined inner cylinder 1 or the inclined outer cylinder 2 is a free end 712, and the free end 712 is provided with a cleaning piece 713, and the cleaning piece 713 is used to clean the side wall of the rake tooth 711, the outer wall and inner wall of the inclined inner cylinder 1, and the inner wall of the inclined outer cylinder 2.

[0041] Among them, Figure 2 As shown, the free end 712 is the bending portion away from the transition portion end. During the heating process, the regenerated coarse material and the regenerated fine material will stick to the inner wall or outer wall of the inclined inner cylinder 1, the inner wall of the inclined outer cylinder 2, and the side wall of the rake tooth 711. The cleaning piece 713 can increase the lifting rate of the regenerated coarse material or the regenerated fine material, so that the heating is more sufficient.

[0042] In a preferred embodiment, the cleaning piece 713 includes a cleaning chain having one end connected to the free end 712, the length of the cleaning chain arranged in the first space is greater than the distance between the free end and the inner wall of the inclined inner cylinder 1, the length of the cleaning chain arranged in the second space is greater than the distance from the free end to the outer wall of the inclined inner cylinder 1, and greater than the distance from the free end to the inner wall of the inclined outer cylinder 2.

[0043] Optionally, the cleaning chain can be made by connecting a plurality of steel balls in series, or by interlocking a plurality of steel rings. The cleaning chain has only one end fixed, so when the inclined inner cylinder 1 and the inclined outer cylinder 2 rotate, the cleaning chain will sag due to gravity, so during the rolling process, the cleaning chain placed on top is suspended, and since the cleaning chain is long, the cleaning chain below the first space 11 can knock the inner wall of the inclined inner cylinder 1 and the side wall of the rake teeth 711, the cleaning chain above the second space 21 can knock the outer wall of the inclined inner cylinder 1, and the cleaning chain below the second space 21 can knock the inner wall of the inclined outer cylinder 1.

[0044] In a preferred embodiment, an anti-wear component 8 is provided in the first space near the heating component 4 , and the anti-wear component 8 is used to prevent the recycled coarse material from rubbing against the inner wall of the inclined inner cylinder 1 .

[0045] Among them, Figure 1 As shown, the anti-wear component 8 is arranged on the side of the inclined inner cylinder 1 close to the regenerated coarse material inlet 12. The regenerated coarse material includes gravel. The regenerated coarse material poured from the inlet has not been lifted up, so it will cause friction to the inner wall of the inclined inner cylinder 1. In addition, the heating component 4 is close to the regenerated coarse material inlet 12. If the regenerated coarse material close to the regenerated coarse material inlet 12 is lifted up, the heating component 4 will ignite the regenerated coarse material. Therefore, the anti-wear component 8 also prevents the regenerated coarse material from being ignited.

[0046] In a preferred embodiment, the anti-wear assembly 8 includes a plurality of anti-wear portions arranged axially along the inclined inner cylinder 1, each of the anti-wear portions includes a plurality of anti-wear parts 81 distributed in a circumferential array, and a third space is formed between each of the anti-wear parts 81 and the inner wall of the inclined inner cylinder 1, and the cross-section of the third space is fan-shaped.

[0047] Please refer to Figure 4 As shown, optionally, the anti-wear assembly 8 has a total length of 1 meter and includes three circles of the anti-wear portion. Each of the anti-wear parts 81 includes two inclined plates 811. One side of the two inclined plates 811 is connected, and the other side is fixed to the inner wall of the inclined inner cylinder 1. A V-shaped channel is formed between two adjacent anti-wear parts 81, which has a certain material guiding effect.

[0048] In a preferred embodiment, the driving assembly 6 includes a transmission part 61 and a driving part 62, the transmission part 61 includes two steel rings 611 sleeved on the outer wall of the inclined outer cylinder 2, and the two steel rings 611 are distributed along the axial direction of the inclined outer cylinder 2; the transmission part 61 also includes a transmission roller group corresponding to each of the steel rings 611, and each of the transmission roller groups includes two transmission rollers 612 arranged on both sides of the extension line of the axis of the inclined outer cylinder 2 along a third direction, the third direction is perpendicular to the first direction, the extension line direction of the axis of each transmission roller 612 is parallel to the first direction, and each of the steel rings 611 is tangent to the two corresponding transmission rollers 612; the driving part 62 includes a driving motor for driving the transmission roller 612 to rotate.

[0049] Among them, Figure 1 As shown, the third direction is the front-to-back direction, the two steel rings 611 are sleeved at the two ends of the inclined outer cylinder 2 in the left-right direction, there are four transmission rollers 612, and there are four drive motors, which drive the four transmission rollers 612 to rotate synchronously, thereby driving the steel rings 611, the inclined outer cylinder 2, and the inclined inner cylinder 1 to rotate. The drying drum also includes a base 9, the drive motor is fixed to the base 9, and the left and right sides of each transmission roller 612 are provided with bearings 613, the outer ring of the bearing 613 is fixedly connected to the base 9, the transmission roller 612 passes through the two bearings 613, and its outer wall is fixedly connected to the inner ring of the bearing 613, and the outer ring of the bearing 613 is fixedly connected to the base 9.

[0050] In a preferred embodiment, there is a first gap between the inner wall of the steel ring 611 and the outer wall of the inclined outer cylinder 2, and a plurality of elastic sheets 614 are provided in the first gap, one end of the elastic sheet 614 is connected to the outer wall of the inclined outer cylinder 2, and the other end is connected to the inner wall of the steel ring 611.

[0051] Among them, one end of the elastic sheet 614 is welded to the outer wall of the inclined outer cylinder 2, and the other end is welded to the inner wall of the steel ring 611. The elastic sheet is made of elastic steel sheet; it can be slightly deformed under the action of external force. The inclined outer cylinder 2 and the inclined inner cylinder 1 are supported by the elastic sheet 614. In addition, since the temperature of the inclined outer cylinder 2 is high during the heating process and low when not in production, if the steel ring 611 is tightly clamped on the outer wall of the inclined outer cylinder 2, the inclined outer cylinder 2 may crack due to the principle of thermal expansion and contraction. Therefore, the steel ring 611 is connected to the inclined outer cylinder 2 through the elastic sheet 614, which drives the inclined outer cylinder 2 to rotate and avoids the inclined outer cylinder 2 from cracking.

[0052] In a preferred embodiment, the end of the inclined inner cylinder 1 close to the heating component 4 is tapered.

[0053] like Figure 1 As shown, the regenerated coarse material inlet 12 is arranged on the left side of the inclined inner cylinder 1. By setting the left side of the inclined inner cylinder 1 to be conical, it plays a role of guiding materials, making it easy to put the regenerated coarse material into the inclined inner cylinder 1. Since the inclined inner cylinder 1 is inclined, the regenerated coarse material will be transported to the right. In addition, an opening is provided at the bottom of the flue gas smoke box 5, and the heated regenerated coarse material and the regenerated fine material can be discharged from this opening.

[0054] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. A double-layer regeneration drying drum, characterized in that: include: An inclined inner cylinder (1), wherein the inclined inner cylinder (1) has a first space (11), the first space (11) is used to place recycled coarse materials, and the direction of the extended axis of the inclined inner cylinder (1) is the first direction; An inclined outer cylinder (2), the inclined outer cylinder (2) being sleeved outside the inclined inner cylinder (1), a second space (21) being provided between the inclined outer cylinder (2) and the inclined inner cylinder (1), the second space (21) being used for placing recycled fine material, the direction of the extended axis of the inclined outer cylinder (2) being the second direction, the first direction being parallel to the second direction, wherein the recycled fine material contains asphalt; A heating component (4), the heating component (4) being arranged on one side of the highest end of the inclined inner cylinder (1), and being used to heat the regenerated coarse material and heat the cylinder wall of the inclined inner cylinder (1) by heat conduction, and the heated cylinder wall of the inclined inner cylinder (1) then heats the regenerated fine material by heat conduction; A driving assembly (6), wherein the driving assembly (6) is arranged outside the inclined outer cylinder (2) and is used to drive the inclined outer cylinder (2) to drive the inclined inner cylinder (1) to rotate, and the extension line direction of the rotation axis is parallel to the first direction.

2. The double-layer regeneration drying drum according to claim 1, characterized in that: The first space (11) and the second space (21) are both provided with a plurality of copying plate groups (7) axially along the inclined inner cylinder (1) or the inclined outer cylinder (2), each copying plate group (7) comprising a plurality of copying plate portions (71) distributed in an array in the circumferential direction, and the copying plate portions (71) of two adjacent copying plate groups (7) are distributed in a staggered manner.

3. The double-layer regeneration drying drum according to claim 2, characterized in that: Each of the scooping plate parts (71) comprises a plurality of rake teeth (711) distributed along an axis, one end of each of the rake teeth (711) being connected to the inner wall of the inclined inner cylinder (1) or the inner wall of the inclined outer cylinder (2), and the other end being bent in the same direction as the rotation direction of the inclined outer cylinder (2).

4. The double-layer regeneration drying drum according to claim 3, characterized in that: One end of the rake tooth (711) away from the inner wall of the inclined inner cylinder (1) or the inclined outer cylinder (2) is a free end (712). The free end (712) is provided with a cleaning piece (713). The cleaning piece (713) is used to clean the side wall of the rake tooth (711), the outer wall and the inner wall of the inclined inner cylinder (1), and the inner wall of the inclined outer cylinder (2).

5. The double-layer regeneration drying drum according to claim 1, characterized in that: An anti-wear component (8) is provided in the first space (11) near the heating component (4), and the anti-wear component (8) is used to prevent the recycled coarse material from rubbing against the inner wall of the inclined inner cylinder (1).

6. The double-layer regeneration drying drum according to claim 5, characterized in that: The anti-wear assembly (8) comprises a plurality of anti-wear portions arranged axially along the inclined inner cylinder (1), each of the anti-wear portions comprising a plurality of anti-wear parts distributed in a circumferential array, a third space (82) is formed between each of the anti-wear parts and the inner wall of the inclined inner cylinder (1), and the cross-section of the third space (82) is fan-shaped.

7. The double-layer regeneration drying drum according to claim 1, characterized in that: The drive assembly (6) further comprises a base, wherein the drive assembly (6) comprises a transmission part (61) and a drive part (62), wherein the transmission part (61) comprises two steel rings (611) sleeved on the outer wall of the inclined outer cylinder (2), and the two steel rings (611) are arranged along the axial direction of the inclined outer cylinder (2); the transmission part (61) further comprises a transmission roller group arranged corresponding to each of the steel rings (611), and each of the transmission roller groups comprises two transmission rollers (612) arranged along a third direction on both sides of the extended line of the axis of the inclined outer cylinder (2), wherein the third direction is perpendicular to the first direction, and the extended line direction of the axis of each of the transmission rollers (612) is parallel to the first direction, and each of the steel rings (611) is tangent to the two corresponding transmission rollers (612); and the drive part (62) comprises a drive motor for driving the transmission rollers (612) to rotate.

8. The double-layer regeneration drying drum according to claim 7, characterized in that: There is a first gap between the inner wall of the steel ring (611) and the outer wall of the inclined outer cylinder (2), and a plurality of elastic sheets (614) are provided in the first gap. One end of the elastic sheet (614) is connected to the outer wall of the inclined outer cylinder (2), and the other end is connected to the inner wall of the steel ring (611).

9. The double-layer regeneration drying drum according to claim 1, characterized in that: The inclined inner cylinder (1) is tapered at the end close to the heating component (4).

10. The double-layer regeneration drying drum according to claim 4, characterized in that: The cleaning member (713) comprises a cleaning chain having one end connected to the free end (712); the length of the cleaning chain arranged in the first space (11) is greater than the distance between the free end (712) and the inner wall of the inclined inner cylinder (1); the length of the cleaning chain arranged in the second space (21) is greater than the distance between the free end (712) and the outer wall of the inclined inner cylinder (1), and is greater than the distance between the free end (712) and the inner wall of the inclined outer cylinder (2).

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