Material turning device for aerobic composting and layered turning method

Abstract

The invention relates to the technical field of aerobic composting, in particular to a material turning device for aerobic composting and a layered turning method. The material turning and throwing device for aerobic composting comprises a walking mechanism, a supporting frame and a turning and throwing assembly, the turning and throwing assembly comprises a first turning and throwing roller assembly and a second turning and throwing roller assembly, and the first turning and throwing roller assembly is higher than the second turning and throwing roller assembly and turns and throws materials entering a turning and throwing channel in a layered mode; the second turning and throwing roller assembly comprises a roller shaft, a cutter structure and an adjusting structure used for driving the cutter structure to stretch out and draw back in the radial direction of the roller shaft, a telescopic part of the adjusting structure and the roller shaft are coaxially arranged, the adjusting structure is used for driving an adjusting rod to move in the axial direction of the roller shaft, and a mounting base corresponding to the cutter structure is arranged on the adjusting rod; the cutter structure is connected with the mounting seat through a connecting rod. According to the material turning and throwing device for aerobic composting, the turning and throwing effect is improved, the uniformity of turning and throwing materials is improved, the energy consumption is reduced, and the fermentation period of aerobic composting is shortened.

Description

Technical Field

[0001] The invention relates to the technical field of aerobic composting, and in particular to a material turning device and a layered turning method for aerobic composting. Background Art

[0002] Aerobic composting is a composting technology that uses aerobic microorganisms to decompose and transform organic solid waste under aerobic conditions. For example, windrow aerobic composting piles the raw materials into windrows and composts under natural ventilation or forced ventilation. It is suitable for small-scale composting and requires regular turning to ensure ventilation and uniform decomposition of materials. Composting raw materials mainly include organic waste. Straw raw materials usually need to be chopped or crushed to increase the surface area of ​​the raw materials, which is conducive to the attachment and decomposition of microorganisms and accelerates the composting process.

[0003] Among them, compost turning is an important part of windrow aerobic composting. In the composting process, it is generally necessary to turn the compost several times. Compost turning is used to improve the aeration of the pile so that the materials inside can fully contact the oxygen, and at the same time, make the temperature and humidity of each part of the pile more uniform. In the prior art, mechanical compost turning equipment is usually used to turn the pile. For example, after the tool of the compost turning machine contacts the pile, as the compost turning machine moves forward, the tool gradually cuts into the pile, cuts the materials in the pile and turns them upward or to one side, turns the materials outside the pile to the inside, and turns the materials inside to the outside, so as to achieve uniform mixing of the materials.

[0004] However, the above-mentioned mechanical compost turning equipment has the following defects during actual use: 1. When turning the material with its single roller structure, the turning range of the material is relatively limited, and it is difficult to ensure that the material in the entire stack can be fully and evenly turned, which in turn affects the overall composting process and quality stability; 2. When the texture, moisture or composition of the material varies greatly, it is difficult for the single roller turning machine to flexibly adjust the turning parameters to adapt, especially when encountering materials with high fiber content (such as compost raw materials mixed with a large amount of straw), the single roller structure is difficult to effectively chop and turn the material, resulting in the material agglomerating or entangled on the roller, affecting the normal operation of the equipment and the turning effect; 3. The tool structure on the roller structure is relatively fixed, and the cutting depth cannot be flexibly changed, which makes it difficult to effectively chop and turn the compost raw materials, and the tool may even be damaged. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a turning device for aerobic composting in windrow type material, so as to improve the turning effect, improve the uniformity of the turned material, reduce energy consumption and shorten the fermentation period of aerobic composting.

[0006] In order to solve the above technical problems, in the first aspect, the present invention proposes a material turning device for aerobic composting, comprising a walking mechanism, a support frame and a turning assembly, wherein the support frame is mounted on the walking mechanism, a turning channel for turning materials is arranged between the support frames, the turning assembly is arranged in the turning channel, and a power device for driving the turning assembly is arranged on the support frame; The flipping assembly includes a first flipping roller assembly and a second flipping roller assembly, the first flipping roller assembly and the second flipping roller assembly are arranged in sequence from front to back along the travel direction of the walking mechanism in the flipping channel, the first flipping roller assembly is higher than the second flipping roller assembly, and the materials entering the flipping channel are flipped in layers; The first turning and throwing roller assembly is used to turn over the upper layer of materials in the turning and throwing channel, and throw the upper layer of materials to the second turning and throwing roller assembly, and the second turning and throwing roller assembly is used to turn over the lower layer of materials in the turning and throwing channel, and turn over and mix the upper layer of materials with the lower layer of materials; The second flipping roller assembly includes a roller shaft, a tool structure and an adjustment structure for driving the tool structure to extend and retract along the radial direction of the roller shaft, the roller shaft is provided with an adjustment cavity inside, the adjustment structure is arranged in the adjustment cavity, and the side wall of the roller shaft is provided with a through groove for embedding the tool structure; The adjustment structure includes a telescopic component, an adjustment rod and a connecting rod. The telescopic component is coaxially arranged with the roller shaft and is used to drive the adjustment rod to move axially along the roller shaft. A mounting seat corresponding to the tool structure is provided on the adjustment rod, and the tool structure is connected to the mounting seat through the connecting rod.

[0007] In a second aspect, the present invention further proposes a layered turning method using the material turning device for aerobic composting, comprising the following steps: During the turning and throwing process, as the traveling mechanism moves along the material pile, the first turning and throwing roller assembly and the second turning and throwing roller assembly located in the turning and throwing channel and along the moving direction from front to back start to work. The first turning and throwing roller assembly first turns and throws the upper layer of materials entering the turning and throwing channel, and throws the upper layer of materials to the second turning and throwing roller assembly at the rear through its own rotation; The second turning roller assembly operates synchronously to turn over the lower layer of materials, and its roller shaft drives the tool structure to rotate. The tool structure cuts into the lower layer of materials during the rotation process, and the lower layer of materials is turned over, cut, and scattered, thereby realizing the turning over of the lower layer of materials. At the same time, the upper layer of materials thrown down from the first turning roller assembly and the lower layer of materials turned over by the second turning roller assembly meet and mix with each other in the action area of ​​the second turning roller assembly. The rotation of the second turning roller assembly further promotes the full interweaving and stirring of the upper layer of materials and the lower layer of materials, so that the materials form an overall turning and mixing effect in the turning and throwing channel, forming layered turning and mixing and uniform mixing; Among them, the telescopic component drives the adjusting rod to move along the axial direction of the roller shaft according to the actual situation of flipping the material, driving the tool structure to telescope along the radial direction of the roller shaft, thereby changing the length of the tool structure extending out of the through groove of the side wall of the roller shaft, and changing the range of the action area of ​​the second flipping roller assembly, thereby adjusting the flipping depth of the lower layer of material, so as to better flip and mix the upper and lower layers of material.

[0008] Compared with the prior art, the material turning device and layered turning method for aerobic composting provided by the present invention have the following outstanding substantial features and significant improvements: 1. The material turning device for aerobic composting realizes layered turning of materials by arranging the first turning roller assembly and the second turning roller assembly in sequence from front to back in the turning channel with different heights. The upper layer of materials is first efficiently turned over by the first turning roller assembly and accurately thrown to the second turning roller assembly, and then mixed with the lower layer of materials turned over by the second turning roller assembly. The layered processing can ensure that the upper and lower layers of the materials are fully turned over. Compared with the traditional single roller body or general turning and throwing method, the turning and throwing uniformity and thoroughness are greatly improved, which reduces energy consumption, is conducive to the uniform distribution of oxygen in the aerobic composting process, accelerates the microbial fermentation process, improves the composting efficiency, and shortens the fermentation cycle of aerobic composting. At the same time, the telescopic component in the adjustment structure of the second turning and throwing roller assembly drives the adjustment rod to move axially, thereby driving the tool structure connected to the mounting seat through the connecting rod to extend and retract along the roller shaft radially, so that in the process of turning and throwing the materials, the extension length of the tool structure can be flexibly adjusted according to the material characteristics (such as the compactness, humidity, particle size, etc. of the material), and the turning and throwing depth and strength of the lower layer of materials can be accurately controlled, which is suitable for aerobic composting materials of different types and states, and improves the adaptability and treatment effect of the device to different materials.

[0009] 2. The layered turning method utilizes the first turning roller assembly and the second turning roller assembly to turn the materials in layers with adjustable depth and strength. The materials are mixed more evenly during the turning process, and each part of the materials is more fully in contact with the air, so that the microbial decomposition in the aerobic composting process is more balanced and efficient, which is beneficial to more fully converting the organic matter in the materials into beneficial components such as humus, reducing the residue of uncomposted materials, thereby improving the quality of the final compost product. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 The present invention is a schematic diagram of the assembly structure of a material turning device for aerobic composting in an embodiment of the present invention.

[0011] Figure 2 yes Figure 1 Left view of .

[0012] Figure 3It is a schematic diagram of the assembly structure of the first flipping roller assembly and the second flipping roller assembly in the flipping channel in an embodiment of the present invention.

[0013] Figure 4 It is a schematic diagram of the assembly structure of the second flipping roller assembly in an embodiment of the present invention.

[0014] Figure numerals: 1. walking mechanism; 2. supporting frame; 3. flipping assembly; 4. flipping channel; 5. spiral sheet; 31. first flipping roller assembly; 32. second flipping roller assembly; 321. roller shaft; 322. tool structure; 323. adjusting chamber; 324. telescopic component; 325. adjusting rod; 326. connecting rod; 3221. tool holder; 3222. blade; 3223. limit seat. DETAILED DESCRIPTION

[0015] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0016] like Figure 1-Figure 4 As shown, an embodiment of the present invention proposes a material turning device and a layered turning method for aerobic composting, which aims to improve the turning effect of the pile during aerobic composting in strip-type piles, improve the uniformity of the turned materials, reduce energy consumption, and shorten the fermentation cycle of aerobic composting.

[0017] A material turning device for aerobic composting proposed in an embodiment of the present invention realizes layered turning of materials by setting a first turning roller assembly and a second turning roller assembly arranged in sequence from front to back in a turning channel with different heights. The upper layer of materials is first efficiently turned by the first turning roller assembly and accurately thrown to the second turning roller assembly, and then mixed with the lower layer of materials turned by the second turning roller assembly. The layered processing can ensure that the upper and lower layers of the materials are fully turned. Compared with the traditional single roller body or general turning method, the turning uniformity and thoroughness are greatly improved, the energy consumption is reduced, and it is beneficial to the uniform distribution of oxygen in the aerobic composting process, accelerates the microbial fermentation process, improves the composting efficiency, and shortens the fermentation cycle of aerobic composting.

[0018] like Figure 1 Combination Figure 2 As shown, a material turning device for aerobic composting includes a traveling mechanism 1, a supporting frame 2 and a turning assembly 3. The supporting frame 2 is mounted on the traveling mechanism 1. A turning channel 4 for turning materials is provided between the supporting frames 2. The turning assembly 3 is arranged in the turning channel 4. A power device for driving the turning assembly 3 is provided on the supporting frame 2. For example, the output end of the power device transmits power to the turning assembly 3 through a chain transmission mechanism.

[0019] like Figure 1 Combination Figure 3As shown, the flipping assembly 3 includes a first flipping roller assembly 31 and a second flipping roller assembly 32. The first flipping roller assembly 31 and the second flipping roller assembly 32 are arranged in sequence from front to back along the traveling direction of the walking mechanism 1 in the flipping channel 4. The first flipping roller assembly 31 is higher than the second flipping roller assembly 32, and the materials entering the flipping channel 4 are flipped in layers. Figure 3 The direction indicated by the middle arrow is the traveling direction of the walking mechanism 1 .

[0020] like Figure 3 As shown, the first flipping roller assembly 31 is used to flip the upper layer of materials in the flipping channel 4, and throw the upper layer of materials to the second flipping roller assembly 32. The second flipping roller assembly 32 is used to flip the lower layer of materials in the flipping channel 4, and flip and mix the upper layer of materials with the lower layer of materials. The first flipping roller assembly 31 and the second flipping roller assembly 32 have the same structure.

[0021] like Figure 4 As shown, the second flipping roller assembly 32 includes a roller shaft 321, a tool structure 322, and an adjustment structure for driving the tool structure 322 to extend and retract along the radial direction of the roller shaft 321. An adjustment cavity 323 is provided inside the roller shaft 321. The adjustment structure is arranged in the adjustment cavity 323. A through groove for embedding the tool structure 322 is provided on the side wall of the roller shaft 321.

[0022] The adjustment structure includes a telescopic component 324, an adjustment rod 325 and a connecting rod 326. The telescopic component 324 is coaxially arranged with the roller shaft 321, and is used to drive the adjustment rod 325 to move along the axial direction of the roller shaft 321. The adjustment rod 325 is provided with a mounting seat corresponding to the tool structure 322. The tool structure 322 is connected to the mounting seat through the connecting rod 326.

[0023] Among them, the telescopic component 324 in the adjustment structure of the second turning roller assembly 32 drives the adjustment rod 325 to move axially, thereby driving the tool structure 322 connected to the mounting seat through the connecting rod 326 to radially extend and retract along the roller shaft 321, so as to facilitate the flexible adjustment of the extension length of the tool structure 322 according to the material characteristics (such as the compactness, humidity, particle size, etc. of the material) during the turning process of the material, accurately control the turning depth and strength of the lower layer of material, adapt to aerobic composting materials of different types and states, and improve the adaptability and processing effect of the device to different materials.

[0024] like Figure 4 As shown, the tool structure 322 includes a tool holder 3221 and a blade 3222. The tool holder 3221 is connected to the mounting seat via a connecting rod 326. The blade 3222 is mounted on the tool holder 3221. A limit seat 3223 is provided at the through groove for limiting the movement of the tool holder 3221 along the axial direction of the roller shaft 321. A sliding end surface for connecting with the limit seat 3223 is provided on the tool holder 3221.

[0025] In this way, during the high-speed rotation of the second turning roller assembly 32 to turn the material, the knife seat 3221 can maintain a stable position relationship, avoiding uneven force on the blade 3222 due to axial movement, generating additional vibration, or collision and wear with the roller shaft 321 and other components, thereby ensuring the continuity and efficiency of the aerobic composting material turning operation.

[0026] The cooperation between the limit seat 3223 and the knife seat 3221 realizes the precise positioning of the knife structure 322, and the blade 3222 can always cut into the material at a predetermined angle and position, ensuring the accuracy and consistency of flipping the lower layer of materials. Regardless of how the speed of the roller 321 changes, or what kind of reaction force the material exerts on the knife, the blade 3222 can maintain its correct posture in the radial and circumferential directions of the roller 321, thereby efficiently completing the tasks of cutting, flipping and mixing the lower layer of materials.

[0027] In addition, when the adjustment structure drives the tool structure 322 to radially extend and retract along the roller shaft 321 to adapt to different material characteristics, the tool holder 3221 will not interfere with the accuracy of radial extension and retraction due to axial displacement, so that the extension length of the blade 3222 can be adjusted accurately according to the material conditions, further enhancing the adaptability and processing capabilities of the second turning roller assembly 32 to different materials, ensuring that the ideal layered turning effect can be achieved under various material conditions, and improving the application flexibility and effectiveness of the entire material turning device in aerobic composting scenarios of different materials.

[0028] like Figure 1 As shown, multiple tool structures 322 are arranged in a linear array along the axial direction of the roller shaft 321 to form a flipping unit. Multiple groups of flipping units are arranged in a ring shape on the side wall of the roller shaft 321, and adjacent flipping units are arranged in a staggered manner. This arrangement ensures that there is sufficient tool distribution density in the axial direction of the roller shaft 321, and a comprehensive flipping operation can be performed on the lower layer of materials, avoiding the occurrence of missed areas of flipping of materials in the axial direction.

[0029] Multiple groups of turning units are arranged in a circular shape on the side wall of the roller 321, achieving full coverage of the material in the circumferential direction of the roller 321, so that no matter what angle the roller 321 rotates to, there are knives that contact and turn the material. In addition, the staggered arrangement of adjacent turning units further optimizes this coverage effect, effectively reducing the dead corners of material turning caused by the regularity of the knife arrangement, so that the material can be turned evenly and without omission in the entire turning channel 4, greatly improving the uniformity and thoroughness of material turning, which is conducive to the full contact between microorganisms and materials during aerobic composting, accelerating the composting reaction process, and improving the quality of composting.

[0030] like Figure 1As shown, a spiral blade 5 is provided at the end of the roller 321. The spiral blade 5 is used to push the material near it along the direction of the spiral line. For the material entering the turning channel 4, especially in the area near the end of the roller 321, the spiral blade 5 can effectively gather the relatively scattered materials into the main working area of ​​the turning assembly 3, ensuring that more materials can be fully turned by the tool structure 322, reducing the omission of materials during the turning process, and improving the overall production capacity of aerobic composting production.

[0031] In order to monitor the material flipping, a pressure sensor is provided between the roller 321 and the support frame 2. For example, the roller 321 is mounted on the support frame 2 through a bearing seat. A pressure sensor is provided between the bearing seat and the support frame 2. The pressure sensor is used to detect the change in resistance experienced by the roller 321 during the material flipping process. The operator can obtain the resistance data experienced by the roller 321 at any time and intuitively understand the actual flipping of the material. For example, when the pressure sensor detects a sudden increase in resistance, it means that there are large pieces of foreign matter in the material or the material is too thickly accumulated, so that potential problems can be discovered in time and corresponding measures can be taken to avoid equipment damage or poor flipping effect due to continued abnormal conditions, thereby ensuring the stable progress of the flipping operation and the normal operation of the equipment.

[0032] According to some preferred embodiments of the present invention, the control module of the telescopic component 324 is used to receive the resistance change information detected by the pressure sensor. The control module drives the telescopic component 324 to drive the adjustment rod 325 to move axially along the roller shaft 321 according to the resistance change information. In this way, the second turning roller assembly 32 can automatically adjust the tool structure 322 according to the resistance change, which can avoid equipment overload or abnormal operation caused by sudden changes in material properties. The control module can respond quickly to resistance changes and adjust the tool position in time, so that the equipment always operates within a reasonable load range, maintains a stable operating state, reduces downtime caused by equipment failure, improves the continuity and reliability of aerobic composting production, reduces equipment maintenance costs and production operation risks, and ensures the smooth progress of the entire composting operation process.

[0033] When the material turning device for aerobic composting proposed in the embodiment of the present invention is used, during the turning process, as the traveling mechanism 1 moves along the material pile, the first turning roller assembly 31 and the second turning roller assembly 32 located in the turning channel 4 and moving from front to back along the direction of travel start to work. The first turning roller assembly 31 first turns the upper layer of material entering the turning channel 4, and throws the upper layer of material to the second turning roller assembly 32 at the rear through its own rotation.

[0034] The second flipping roller assembly 32 operates synchronously to flip the lower layer of material. Its roller shaft 321 drives the cutter structure 322 to rotate. The cutter structure 322 cuts into the lower layer of material during the rotation process, and the lower layer of material is flipped, cut, and scattered, thereby realizing the flipping of the lower layer of material. At the same time, the upper layer of material thrown down from the first flipping roller assembly 31 and the lower layer of material flipped by the second flipping roller assembly 32 meet and mix with each other in the action area of ​​the second flipping roller assembly 32. The rotation of the second flipping roller assembly 32 further promotes the full interweaving and stirring of the upper layer of material and the lower layer of material, so that the material forms an overall flipping and mixing effect in the flipping channel 4, forming a layered flipping and mixing and uniform mixing.

[0035] Among them, the telescopic component 324 drives the adjusting rod 325 to move axially along the roller shaft 321 according to the actual situation of flipping the material, driving the tool structure 322 to telescope along the radial direction of the roller shaft 321, thereby changing the length of the tool structure 322 extending out of the side wall groove of the roller shaft 321, changing the range of the action area of ​​the second flipping roller assembly 32, thereby adjusting the flipping depth of the lower layer of material, so as to better flip and mix the upper layer material and the lower layer material.

[0036] The present invention is not limited to the specific technical solutions described in the above embodiments. In addition to the above embodiments, the present invention may also have other implementation modes. For those skilled in the art, any technical solutions formed by any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A material turning device for aerobic composting, comprising a walking mechanism, a supporting frame and a turning assembly, wherein the supporting frame is mounted on the walking mechanism, a turning channel for turning materials is arranged between the supporting frames, the turning assembly is arranged in the turning channel, and a power device for driving the turning assembly is arranged on the supporting frame; It is characterized in that The flipping assembly includes a first flipping roller assembly and a second flipping roller assembly, the first flipping roller assembly and the second flipping roller assembly are arranged in sequence from front to back along the travel direction of the walking mechanism in the flipping channel, the first flipping roller assembly is higher than the second flipping roller assembly, and the materials entering the flipping channel are flipped in layers; The first turning and throwing roller assembly is used to turn over the upper layer of materials in the turning and throwing channel, and throw the upper layer of materials to the second turning and throwing roller assembly, and the second turning and throwing roller assembly is used to turn over the lower layer of materials in the turning and throwing channel, and turn over and mix the upper layer of materials with the lower layer of materials; The second flipping roller assembly includes a roller shaft, a tool structure and an adjustment structure for driving the tool structure to extend and retract along the radial direction of the roller shaft, the roller shaft is provided with an adjustment cavity inside, the adjustment structure is arranged in the adjustment cavity, and the side wall of the roller shaft is provided with a through groove for embedding the tool structure; The adjustment structure includes a telescopic component, an adjustment rod and a connecting rod. The telescopic component is coaxially arranged with the roller shaft and is used to drive the adjustment rod to move axially along the roller shaft. A mounting seat corresponding to the tool structure is provided on the adjustment rod, and the tool structure is connected to the mounting seat through the connecting rod.

2. The material turning device for aerobic composting according to claim 1, characterized in that: The tool structure includes a tool seat and a blade. The tool seat is connected to the mounting seat via a connecting rod. The blade is mounted on the tool seat. A limit seat is provided at the through groove for limiting the axial movement of the tool seat along the roller shaft. A sliding end surface is provided on the tool seat for connecting to the limit seat.

3. The material turning device for aerobic composting according to claim 1, characterized in that: A plurality of tool structures are arranged in a linear array along the axial direction of the roller shaft to form a flipping unit. A plurality of groups of flipping units are arranged in a ring shape on the side wall of the roller shaft, and adjacent flipping units are arranged in a staggered manner.

4. The material turning device for aerobic composting according to claim 3, characterized in that: The end of the roller shaft is provided with a spiral sheet.

5. The material turning device for aerobic composting according to claim 1, characterized in that: The roller is mounted on a support frame via a bearing seat. A pressure sensor is provided between the bearing seat and the support frame. The pressure sensor is used to detect changes in resistance experienced by the roller during material turning.

6. The material turning device for aerobic composting according to claim 5, characterized in that: The control module of the telescopic component is used to receive the resistance change information detected by the pressure sensor, and the control module drives the telescopic component to drive the adjusting rod to move along the axial direction of the roller shaft according to the resistance change information.

7. The material turning device for aerobic composting according to claim 1, characterized in that: The first turning roller assembly and the second turning roller assembly have the same structure.

8. The layered turning method of the material turning device for aerobic composting according to any one of claims 1 to 7, characterized in that: include: During the turning and throwing process, as the traveling mechanism moves along the material pile, the first turning and throwing roller assembly and the second turning and throwing roller assembly located in the turning and throwing channel and along the moving direction from front to back start to work. The first turning and throwing roller assembly first turns and throws the upper layer of materials entering the turning and throwing channel, and throws the upper layer of materials to the second turning and throwing roller assembly at the rear through its own rotation; The second turning roller assembly operates synchronously to turn over the lower layer of materials, and its roller shaft drives the tool structure to rotate. The tool structure cuts into the lower layer of materials during the rotation process, and the lower layer of materials is turned over, cut, and scattered, thereby realizing the turning over of the lower layer of materials. At the same time, the upper layer of materials thrown down from the first turning roller assembly and the lower layer of materials turned over by the second turning roller assembly meet and mix with each other in the action area of ​​the second turning roller assembly. The rotation of the second turning roller assembly further promotes the full interweaving and stirring of the upper layer of materials and the lower layer of materials, so that the materials form an overall turning and mixing effect in the turning and throwing channel, forming layered turning and mixing and uniform mixing; Among them, the telescopic component drives the adjusting rod to move along the axial direction of the roller shaft according to the actual situation of flipping the material, driving the tool structure to telescope along the radial direction of the roller shaft, thereby changing the length of the tool structure extending out of the through groove of the side wall of the roller shaft, and changing the range of the action area of ​​the second flipping roller assembly, thereby adjusting the flipping depth of the lower layer of material, so as to better flip and mix the upper and lower layers of material.

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