Material drum breaking and drying device

Abstract

The present application belongs to the technical field of drying device, and specifically discloses a material rotary drum breaking and drying device, which comprises a chassis, a material rotary drum and a drying fan, both ends of the material rotary drum below are rotatably installed above the chassis through a rotating limiting mechanism arranged, both ends of the material rotary drum outside are fixedly sleeved with rolling rings, one end of the material rotary drum inside is provided with a feeding assembly, the end of the material rotary drum far from the feeding assembly is connected with the drying fan fixed on the ground on one side through a rotating pipe rotatably embedded, a discharging pipe is connected and installed on the side of the material rotary drum inside and close to the drying fan, and a ventilation pipe is connected and installed on the air outlet of the drying fan, the present application realizes the synchronous breaking, drying and conveying of the material, effectively solves the problems of the existing technology, such as the outer focus and the inner wet caused by the hot air unable to penetrate the material, the low drying efficiency and the need of pre-breaking process, and is especially suitable for processing the plastic particles which are damp and clustered.

Description

Technical Field

[0001] This invention belongs to the technical field of drying equipment, and specifically discloses a material rotary drum crushing and drying device. Background Technology

[0002] As one of the most important industrial raw materials, plastic granules often absorb moisture or become damp on their surface due to environmental humidity or accidental contact with water before storage, transportation, and use. Due to their large specific surface area and tendency to generate static electricity, damp plastic granules are very prone to sticking together and agglomerating, forming lumps of varying sizes. Currently, the treatment of damp plastic granules typically employs independent drying equipment, such as hot air circulating ovens, dehumidifying dryers, or rotary drying drums. These traditional drying processes mainly face the following pressing technical challenges that need to be addressed: Existing drying equipment primarily uses convective hot air to heat the surface of materials and exchange moisture. However, when plastic granules clump together, the hot air can only contact the outer surface of the clumps and cannot effectively penetrate into the interior. This makes it difficult for internal moisture to evaporate, resulting in a "burnt outside, wet inside" phenomenon. To achieve the specified moisture content, the drying time must be significantly extended, leading to a sharp decrease in drying efficiency and a significant increase in energy consumption.

[0003] Existing drying equipment has a limited functional design, only providing heating and air blowing capabilities, and lacking mechanical crushing capabilities. When dealing with already agglomerated plastic granules, an additional pre-crushing process is usually required, or manual crushing and dismantling by operators is necessary. This not only increases the complexity of the process and labor costs, but also creates inconsistencies and efficiency bottlenecks in the production process, preventing continuous and automated production.

[0004] Therefore, the present invention proposes a material rotary drum crushing and drying device to solve the above-mentioned defects. Summary of the Invention

[0005] The purpose of this invention is to solve the problems existing in the background art, and to propose a material rotary drum crushing and drying device, including a base frame, a material rotary drum, and a drying fan. The lower two ends of the material rotary drum are rotatably mounted on the base frame through a set rotation limiting mechanism. Roller rings are fixedly sleeved on both ends of the material rotary drum. A feeding assembly is set at one end of the material rotary drum. The end of the material rotary drum away from the feeding assembly is connected to the drying fan fixed to the ground on one side through a rotatably embedded rotating tube. A discharge pipe is connected to the inside of the material rotary drum and the side near the drying fan. A ventilation pipe is connected to the air outlet of the drying fan. One end of the ventilation pipe extends into the inside of the material rotary drum. Air outlets are set at equal distances along the horizontal direction on both sides of the ventilation pipe. A rotating crushing component is set inside the material rotary drum and the side near the feeding assembly.

[0006] In the above technical solution, the rotation limiting mechanism further includes positioning rollers symmetrically installed at one end of the upper surface of the base frame. Bearing seats are fixedly installed on both sides of the upper surface of the base frame near the two sets of positioning rollers. A dual-axis motor is fixedly installed in the middle of the upper surface of the base frame. The output shafts at both ends of the dual-axis motor pass through the two sets of bearing seats and positioning rollers on one side. The rolling ring rolls and fits against the two sets of positioning rollers. Limiting rollers roll and fit against both sides of the upper surface of the base frame near the rolling ring.

[0007] In the above technical solution, the feeding assembly further includes a feeding hopper connected to and installed inside the material rotating drum on the side away from the drying fan, and a plate gate valve is connected to and installed on one side inside the feeding hopper.

[0008] In the above technical solution, the air outlet component further includes multiple air outlet ducts, and multiple sets of filter grooves are formed inside the material rotating drum and near the outer surface of the multiple air outlet ducts.

[0009] In the above technical solution, the rotating crushing component further includes shafts that are equidistantly installed inside the material rotating drum along the circumferential direction and near the feed hopper. Each of the multiple shafts is rotatably sleeved with a limiting bushing. A rotating shell is rotatably installed inside the material rotating drum and near the multiple limiting bushings. A gear ring is fixedly sleeved on the outside of the rotating shell. A driving mechanism is provided inside the material rotating drum and below the gear ring. Fixing frames are symmetrically installed on the outer wall of the rotating shell on the side away from the limiting bushings. A dispersing component is provided between the two sets of fixing frames.

[0010] In the above technical solution, the driving mechanism further includes a rotating shaft rotatably installed inside the material rotating drum and near the gear ring below it. A gear is fixedly sleeved on the outside of the rotating shaft, and the gear meshes with the gear ring. One end of the rotating shaft extends to the outside of the material rotating drum and is connected to a rotary motor. The rotary motor is fixedly installed on the outer wall of the material rotating drum by a fixedly sleeved bracket.

[0011] In the above technical solution, the dispersing component further includes four retaining rings and multiple sets of dispersing slices. The four retaining rings are divided into two groups, and the multiple sets of dispersing slices are installed at equal distances along the circumferential direction inside a group of retaining rings. The multiple sets of dispersing slices inside a group of retaining rings are evenly distributed inward and outward.

[0012] In the above technical solution, furthermore, connecting rods are fixedly installed on the outer sides of both sets of fixed frames, and a turntable is installed on the end of the two connecting rods away from the fixed frame. The turntable is rotatably connected to the material drum. Spiral blades are installed on the outer sides of the two connecting rods. A frame rod is installed horizontally along the inner edge of the spiral blade. Cleaning plates are installed at equal intervals along the horizontal direction on the outer side of the frame rod. Multiple anti-clogging brush heads are fixedly installed on the outer surface of the cleaning plate.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention, by incorporating a rotating crushing component inside the rotating drum, allows damp, agglomerated plastic particles to be broken up in real time upon entering the drum, exposing their moist inner surfaces. This enables subsequent hot air to make full and uniform contact with the material. This solves the core problems of low heat exchange efficiency, long drying time, and high energy consumption caused by material agglomeration in the prior art, achieving simultaneous crushing and drying and significantly improving overall processing efficiency.

[0014] 2. The dispersing components in the rotating crusher employ a combination of dispersing slices with different internal and external shapes. During rotation, these slices exert multiple forces on the material clumps, including impact, shearing, and pulling, effectively breaking down large clumps into loose, individual particles. This results in a good crushing effect and creates the necessary conditions for subsequent efficient drying.

[0015] 3. Through the set spiral blades, while pushing the material towards the discharge port, the cleaning plate and anti-clogging brush head on it can continuously scrape the inner wall of the rotating drum to prevent wet and sticky materials from adhering and accumulating. This effectively avoids the problem of reduced heat transfer efficiency and equipment blockage caused by wall adhesion, ensuring that the device can operate continuously and stably for a long time. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the inner structure of the material rotating drum of the present invention; Figure 3 This is a schematic diagram of the overall connection structure of the rotating crusher of the present invention; Figure 4 This is a schematic diagram of the connection structure between the air outlet and the drying fan of the present invention; Figure 5 This is a schematic diagram of the overall connection structure of the dispersed components of the present invention; Figure 6 This is a schematic diagram showing the structural connection between the fixing frame and the retaining ring of the present invention. Figure 7 For invention Figure 2 Enlarged structural diagram at point A in the middle.

[0017] In the diagram: 1. Base frame; 2. Dual-shaft motor; 3. Material rotating drum; 4. Roller ring; 5. Rotary motor; 6. Feed hopper; 7. Positioning roller; 8. Plate gate valve; 9. Rotary tube; 10. Drying fan; 11. Discharge pipe; 12. Gear ring; 13. Limiting bushing; 14. Fixing frame; 15. Ventilation pipe; 16. Spiral blade; 17. Connecting rod; 18. Air outlet; 19. Turntable; 20. Cleaning plate; 21. Frame rod; 22. Filter tank; 23. Rotating shell; 24. Bracket; 25. Gear; 26. Rotating shaft; 27. Snap ring; 28. Dispersing slices; 29. ​​Shaft; 30. Anti-clogging brush head; 31. Limiting roller. Detailed Implementation

[0018] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the invention is not limited to the specific embodiments disclosed below.

[0020] like Figures 1-7 The material rotary drum crushing and drying device shown includes a base frame 1, a material rotary drum 3, and a drying fan 10. The material rotary drum 3 is rotatably mounted on the base frame 1 at both ends of its lower part through a set rotation limiting mechanism. Roller rings 4 are fixedly sleeved at both ends of the material rotary drum 3. A feeding component is set at one end of the material rotary drum 3. The end of the material rotary drum 3 away from the feeding component is connected to the drying fan 10 fixed to the ground on one side through a rotating tube 9. A discharge pipe 11 is connected to the inside of the material rotary drum 3 and the side close to the drying fan 10. A ventilation pipe 15 is connected to the air outlet of the drying fan 10. One end of the ventilation pipe 15 extends into the inside of the material rotary drum 3. Air outlets are set at equal distances along the horizontal direction on both sides of the ventilation pipe 15. A rotating crushing component is set inside the material rotary drum 3 and the side close to the feeding component. In this embodiment, the material drum 3 is the main container for material crushing and drying. Its two ends are mounted on the base frame 1 through rotation limiting mechanisms, so that the material drum 3 can rotate stably. The drying fan 10 is fixed to the ground and is the power source for providing drying hot air. The drying fan 10 can be a centrifugal hot air fan. The drying fan 10 generates hot air, which is evenly sent into the interior of the material drum 3 through the ventilation pipe 15 and the air outlet, so as to achieve full coverage of hot air inside the drum.

[0021] The rotation limiting mechanism includes positioning rollers 7 symmetrically installed at one end of the upper surface of the base frame 1. Bearing seats are fixedly installed on both sides of the upper surface of the base frame 1 and close to the two sets of positioning rollers 7. A dual-axis motor 2 is fixedly installed in the middle of the upper surface of the base frame 1. The output shafts at both ends of the dual-axis motor 2 pass through the two sets of bearing seats and positioning rollers 7 on one side. The rolling ring 4 rolls and fits against the two sets of positioning rollers 7. Limiting rollers 31 roll and fit against both sides of the upper surface of the base frame 1 and close to the rolling ring 4. In this embodiment, the positioning roller 7 is a polyurethane coated roller, which is symmetrically arranged at both ends of the upper surface of the base frame 1 and rotates in conjunction with the roller ring 4. The limiting roller 31 is a steel roller and rolls in contact with the side of the roller ring 4 to limit lateral displacement. Specifically, after the dual-shaft motor 2 is powered on, the output shaft is reduced in speed by the gearbox, which drives the positioning rollers 7 at both ends to rotate at low speed. The rolling ring 4 of the material drum 3 rolls and rubs against the positioning rollers 7, and rotates around its own axis with the positioning rollers 7. During the rotation, the limiting roller 31 is always in contact with the side of the rolling ring 4 to prevent the material drum 3 from shifting laterally due to material eccentricity or vibration, thus ensuring the stability of subsequent crushing and drying operations.

[0022] The feeding assembly includes a feeding hopper 6 connected to the inside of the material drum 3 and located away from the drying fan 10. A plate gate valve 8 is connected to one side of the inside of the feeding hopper 6. In this embodiment, the plate gate valve 8 can be hydraulic, used to seal materials, and can also control the degree of opening and closing; Specifically, the material is fed into the feed hopper 6 and falls into the material rotating drum 3 through the opening below it. The plate gate valve 8 can precisely control the flow rate of the material entering the rotating drum by adjusting its opening, thereby adapting to materials with different moisture content and agglomeration levels, achieving optimal crushing and drying effects, and preventing excessive feeding from causing equipment blockage.

[0023] The air outlet component includes multiple air outlet ducts 18, and multiple sets of filter grooves 22 are formed inside the material rotating drum 3 and near the outer surface of the multiple air outlet ducts 18. In this embodiment, after hot air enters through the ventilation duct 15, it is evenly blown into the material rotating drum 3 through multiple air outlets 18, where it exchanges heat and mass with the material. The filter tank 22 serves a dual purpose: firstly, it allows hot air to pass through and fully contact the material; secondly, it acts as a dehumidification port, allowing water vapor evaporated from the material to be discharged in a timely manner, while preventing a large amount of material particles from being carried into the air duct, thus playing a certain filtering role.

[0024] The rotating crushing component includes shafts 29 that are equidistantly installed inside the material drum 3 and near the feed hopper 6 along the circumferential direction. Multiple shafts 29 are rotatably sleeved with limiting bushings 13. A rotating shell 23 is rotatably installed inside the material drum 3 and near the multiple limiting bushings 13. A gear ring 12 is fixedly sleeved on the outside of the rotating shell 23. A drive mechanism is provided inside the material drum 3 and below the gear ring 12. Fixing frames 14 are symmetrically installed on the outer wall of the rotating shell 23 away from the limiting bushings 13. A dispersing component is provided between the two sets of fixing frames 14. The drive mechanism includes a rotating shaft 26 that is rotatably installed inside the material drum 3 and below the gear ring 12. A gear 25 is fixedly sleeved on the outside of the rotating shaft 26. The gear 25 meshes with the gear ring 12. One end of the rotating shaft 26 extends to the outside of the material drum 3 and is connected to a rotary motor 5. The rotary motor 5 is fixedly installed on the outer wall of the material drum 3 through a fixedly sleeved bracket 24. In this embodiment, the shaft 29 is made of stainless steel and is externally fitted with a limiting bushing 13. When the rotating shell 23 rotates, it can be supported externally to ensure that the rotating shell 23 rotates smoothly and avoids shaking when it breaks. Specifically, the rotary motor 5 drives the rotating shaft 26 to rotate, the gear 25 meshes with the gear ring 12, and drives the rotating shell 23 to rotate at high speed around the shaft 29; the rotating shell 23 drives the fixed frame 14 to rotate synchronously with the dispersing component, so that the dispersing component can disperse and break up the lumps when feeding.

[0025] The dispersing component includes four retaining rings 27 and multiple sets of dispersing slices 28. The four retaining rings 27 are divided into two groups. The multiple sets of dispersing slices 28 are installed at equal intervals along the circumference inside a group of retaining rings 27. The multiple sets of dispersing slices 28 inside a group of retaining rings 27 are evenly distributed inward and outward. Connecting rods 17 are fixedly installed on the outer sides of the two sets of fixing frames 14. A turntable 19 is installed on the end of the two connecting rods 17 away from the fixing frame 14. The turntable 19 is rotatably connected to the material rotating drum 3. Spiral blades 16 are installed on the outer sides of the two connecting rods 17. A frame rod 21 is installed horizontally along the inner edge of the spiral blade 16. Cleaning plates 20 are installed at equal intervals along the horizontal direction on the outer side of the frame rod 21. Multiple anti-clogging brush heads 30 are fixedly installed on the outer surface of the cleaning plate 20. In this embodiment, when the dispersing component rotates at high speed with the rotating shell 23, the dispersing slices 28 arranged alternately inside and outside form a dense and uneven impact surface in the direction of rotation. The inwardly arranged slices can gather the material towards the center, while the outwardly arranged slices throw the material outward. This alternating action produces a strong tearing, impact and shearing effect on the material clumps, which greatly improves the efficiency and thoroughness of clumping and breaking up. When the rotating shell 23, the fixed frame 14, and the connecting rod 17 rotate, the spiral blades 16 rotate inside the material rotating drum 3, smoothly pushing the continuously falling crushed material towards the discharge port. At the same time, the anti-clogging brush head 30 on the cleaning plate 20 continuously cleans the outer surface of the filter tank 22 during the rotation process, which can prevent the filter tank 22 from being blocked due to the high temperature adhesion and agglomeration of particles, thereby ensuring that the hot air channel is unobstructed and ensuring stable drying efficiency.

[0026] It is important to note that, to achieve optimal crushing and material flow, the material drum 3, driven by the dual-shaft motor 2, rotates slowly clockwise, primarily to lift, scatter, and convey materials. Simultaneously, the rotary motor 5 inside the material drum 3 rotates counter-clockwise. This design of reverse rotation of internal and external components ensures that agglomerated materials, upon entering the material drum 3, are not only lifted and dropped by the drum itself, but also subjected to intense impact, shearing, and grinding from the dispersing chips 28 due to the high relative speed difference between the material drum 3 and the crushing components. This results in a significantly higher agglomeration efficiency compared to co-rotation or static crushing methods. Furthermore, this motion also facilitates the rapid lifting of crushed materials, allowing for thorough mixing with hot air and preventing material accumulation at the bottom, thus maximizing both crushing and drying efficiency simultaneously.

[0027] Working principle: The plate gate valve 8 on one side of the feed hopper 6 is opened, allowing the damp and clumped plastic granules to be poured into the material rotating drum 3. At this time, the rotary motor 5 starts, driving the gear 25 to rotate via the rotating shaft 26. The gear 25 meshes with the gear ring 12 fixed on the rotating shell 23, thereby causing the entire rotating shell 23 to rotate at high speed under the support of the limiting bushing 13. The shaft 29 is evenly distributed along the inner circumference of the material rotating drum 3, and its external limiting bushing 13 provides rotational support for the rotating shell 23, preventing the rotating shell 23 from rotating too much. Shaking, the fixed frame 14 on the side of the rotating shell 23 away from the limiting bushing 13 rotates synchronously with the rotating shell 23, driving the dispersing parts between the two sets of fixed frames 14 to rotate at high speed. The dispersing slices 28 are evenly distributed along the circumference of the retaining ring 27, and are evenly distributed inward and outward. The outward slices can impact and break up large clumps, and the inward slices can tear small agglomerated particles. Under the dual action, the damp and clumped plastic particles are completely broken into evenly dispersed single particles, increasing the contact area between the material and the hot air, and avoiding the subsequent drying process where the outside is burnt and the inside is wet. Then, the dual-axis motor 2 is powered on and runs. Its two output shafts pass through the bearing seats and the positioning rollers 7, driving the two sets of positioning rollers 7 to rotate synchronously. The rolling rings 4 at both ends of the material drum 3 roll and fit against the positioning rollers 7. The rotation driving force of the positioning rollers 7 drives the material drum 3 to rotate slowly around its own axis. At the same time, the limiting rollers 31 on the upper surface of the base frame 1 near the two sides of the rolling rings 4 roll and fit against the rolling rings 4, limiting the lateral displacement of the material drum 3 and ensuring that the material drum 3 rotates smoothly without shaking. During the process of breaking up clumps, the drying fan 10 is powered on and the generated hot air is delivered to the inside of the material drum 3 through the ventilation pipe 15. The air outlets 18, which are equidistantly arranged on both sides of the ventilation pipe 15 in the horizontal direction, evenly disperse the hot air. Multiple sets of filter grooves 22 inside the material drum 3 near the outer surface of the air outlets 18 further guide the diffusion of the hot air, so that the hot air fills the internal space of the drum and avoids the hot air from concentrating in a local area. The crushed plastic particles tumble continuously as the material drum 3 rotates. At the same time, the spiral blades 16 outside the connecting rods 17 on the outer side of the two sets of fixed frames 14 rotate synchronously with the connecting rods 17, pushing the material slowly towards the feed pipe 11 at the other end of the drum. During the tumbling process, each particle can fully contact the hot air, and the moisture adsorbed on the particle surface is carried away by the hot air, achieving rapid drying and ensuring that the moisture in the material drum 3 is fully evaporated after a period of time. When the spiral blade 16 rotates, the support rod 21 also rotates. The cleaning plates 20, which are equidistantly installed horizontally on the outside of the support rod 21, rotate with the support rod 21. The anti-clogging brush head 30 on its outer surface comes into contact with the outside of the air outlet duct 18, which can prevent the filter tank 22 from being blocked due to the high temperature adhesion and clumping of particles, thereby ensuring that the hot air channel is unobstructed and the drying efficiency is stable. Finally, the dried material is discharged through the feed pipe 11.

[0028] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A material rotary drum crushing and drying device, comprising a base frame (1), a material rotary drum (3), and a drying fan (10), characterized in that: The material drum (3) is rotatably mounted on the base frame (1) at both ends below by a rotation limiting mechanism. Roller rings (4) are fixedly fitted at both ends of the material drum (3). A feeding assembly is provided at one end of the material drum (3). The end of the material drum (3) away from the feeding assembly is connected to a drying fan (10) fixed to the ground on one side through a rotating tube (9). A discharge pipe (11) is connected to the side of the material drum (3) near the drying fan (10). A ventilation pipe (15) is connected to the air outlet of the drying fan (10). One end of the ventilation pipe (15) extends to the material drum. (3) Inside, air outlets are provided at equal intervals along the horizontal direction on both sides of the ventilation pipe (15). A rotating crusher is provided inside the material drum (3) and on the side near the feeding assembly. The feeding assembly includes a feeding hopper (6) connected to and installed inside the material drum (3) and away from the drying fan (10). A plate gate valve (8) is connected to and installed on one side inside the feeding hopper (6). The rotating crusher includes shafts (29) installed at equal intervals along the circumference inside the material drum (3) and near the feeding hopper (6). Multiple shafts (29) are rotatably sleeved with limit bushings (13) on their exteriors. The material drum (3) is located inside and near the feeding hopper (6). A rotating shell (23) is rotatably mounted between several limiting bushings (13). A gear ring (12) is fixedly sleeved on the outside of the rotating shell (23). A driving mechanism is provided inside the material rotating drum (3) and below the gear ring (12). Fixing frames (14) are symmetrically mounted on the outer wall of the rotating shell (23) away from the limiting bushings (13). A dispersing component is provided between the two sets of fixing frames (14). The dispersing component includes four retaining rings (27) and multiple sets of dispersing slices (28). The four retaining rings (27) are divided into two groups. The multiple sets of dispersing slices (28) are installed at equal distances along the circumferential direction inside a group of retaining rings (27). 27) The multiple sets of dispersed slices (28) inside are evenly arranged inward and outward. The two sets of fixed frames (14) are fixedly installed with connecting rods (17) on the outside. The two connecting rods (17) are connected with a turntable (19) at the end away from the fixed frame (14). The turntable (19) is rotatably connected to the material drum (3). The two connecting rods (17) are connected with a spiral blade (16) on the outside. The inner edge of the spiral blade (16) is connected with a support rod (21) in the horizontal direction. The support rod (21) is connected with a cleaning plate (20) at equal distances in the horizontal direction. The outer surface of the cleaning plate (20) is fixedly installed with multiple anti-clogging brush heads (30).

2. The material rotary drum crushing and drying device according to claim 1, characterized in that: The rotation limiting mechanism includes positioning rollers (7) symmetrically installed at one end of the upper surface of the base frame (1). Bearing seats are fixedly installed on both sides of the upper surface of the base frame (1) and close to the two sets of positioning rollers (7). A dual-axis motor (2) is fixedly installed in the middle of the upper surface of the base frame (1). The output shafts at both ends of the dual-axis motor (2) pass through the two sets of bearing seats and positioning rollers (7) on one side. The rolling ring (4) rolls and fits against the two sets of positioning rollers (7). Limiting rollers (31) roll and fit against both sides of the upper surface of the base frame (1) and close to the rolling ring (4).

3. The material rotary drum crushing and drying device according to claim 1, characterized in that: The air outlet component includes multiple air outlet ducts (18), and multiple sets of filter grooves (22) are opened inside the material rotating drum (3) and near the outer surface of the multiple air outlet ducts (18).

4. The material rotary drum crushing and drying device according to claim 1, characterized in that: The driving mechanism includes a rotating shaft (26) rotatably installed inside the material drum (3) and near the gear ring (12). A gear (25) is fixedly sleeved on the outside of the rotating shaft (26). The gear (25) meshes with the gear ring (12). One end of the rotating shaft (26) extends to the outside of the material drum (3) and is connected to a rotary motor (5). The rotary motor (5) is fixedly installed on the outer wall of the material drum (3) by a fixedly sleeved bracket (24).

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