A method for stripping frozen soil surface soil for high-cold vegetation restoration

Abstract

This invention discloses a method for stripping topsoil from frozen soil for alpine vegetation restoration in forestry land preparation. The method involves layer-by-layer stripping of the topsoil, followed by separate stacking of the stripped topsoil in a soil storage warehouse. This prevents mixing of different frozen soil layers during stripping and stacking, which could lead to nutrient imbalance and structural damage. During backfilling, layered backfilling restores the vertical soil profile, promotes root development, and restores soil and water conservation functions. Furthermore, the stripping depth of the two stripping mechanisms can be rapidly adjusted and adapted using swing arms one and two, and hydraulic cylinders one and two. Hydraulic cylinder three further fine-tunes the bucket's tilt angle, improving the accuracy of the stripping depth adjustment. Additionally, scrapers and scraping blocks remove soil adhering to the inner wall of the cylinder, the outer wall of the collection cylinder, and the inner wall of the discharge hood, reducing the impact of soil stickiness on conveying efficiency.

Description

Technical Field

[0001] This invention relates to the field of forestry land preparation, and in particular to a method for stripping permafrost topsoil for the restoration of alpine vegetation. Background Technology

[0002] When carrying out infrastructure projects such as road construction or building construction in high-altitude and cold regions, construction activities are very likely to damage the vegetation. Due to the harsh climate conditions in high-altitude and cold regions, the vegetation has a long growth cycle and special ecological adaptability. Once the vegetation is damaged, its self-recovery process is extremely slow and extremely difficult. In order to effectively solve the above problems, topsoil stripping technology is generally adopted. Specifically, before the main construction of the infrastructure project begins, the topsoil of the area to be constructed in the high-altitude and cold region is systematically and professionally collected and orderly piled up. After the main construction of the infrastructure project is completed, the pre-collected and piled topsoil is backfilled into the original construction area in a scientific and reasonable manner.

[0003] A patent application with publication number CN103081602A discloses a method for topsoil stripping in land reclamation engineering. The method involves dividing the field plot to be stripped of topsoil into several strips, stripping the topsoil of the first strip sequentially, storing and maintaining it, and leveling the first strip without topsoil; then stripping the topsoil of the next strip to the leveled first strip, and leveling the next strip; and so on, operating each strip in this manner. Finally, the topsoil stripped from the first strip is backfilled into the last strip, so that each strip reaches the design elevation, effectively protecting soil resources, facilitating construction, and improving efficiency.

[0004] The existing patent with publication number CN110326377B discloses a topsoil stripping device. By setting a rotatable rotary drilling rotor on the vehicle body, the rotary drilling rotor cylinder is perpendicular to the vehicle body's forward direction. The cylinder has a receiving cavity and a through hole on the side wall that connects to the receiving cavity. The conveying mechanism extends into the receiving cavity, and multiple cutter heads are close to the through hole and located on the side facing the rotation direction of the cylinder. This makes the device highly automated and efficient during operation, achieving high-quality topsoil stripping.

[0005] The aforementioned prior art discloses a stripping scheme that employs stripping and sequential translation, and also discloses a technical solution for automated stripping operations using rotary drilling rotors. However, the existing technology still has shortcomings. The currently commonly used surface soil stripping method directly implements the stripping operation based on a pre-set stripping depth. However, in the actual stripping construction process, due to changes in terrain slope, the surface frozen soil is very easy to mix with the deep frozen soil, which leads to changes in the original soil structure and fertility characteristics, ultimately reducing the self-repair capacity of the ecosystem. Summary of the Invention

[0006] The core of this invention lies in using two depth-adjustable stripping mechanisms to perform layered stripping of the surface soil of frozen soil. This solves the problem in the prior art where stripping devices are easily affected by terrain slope, causing the surface soil and deep soil to mix during stripping, thereby damaging the soil structure and fertility characteristics. At the same time, by using scrapers and scraping blocks, the cylinder, collection cylinder, material discharge hood, and adhering soil are efficiently cleaned, improving the conveying and collection efficiency.

[0007] To solve the above problems, the present invention adopts the following technical solution.

[0008] A method for stripping permafrost topsoil for alpine vegetation restoration includes the following steps: Step 1: Based on topographic and soil analysis, determine the stripping depth of the topsoil in the stripping operation area; Step two: At the selected location outside the stripping operation area, a soil storage warehouse is built using steel structure components and equipped with a drainage system; Step 3, Pre-thawing of frozen soil: The soil in the area to be thawed is thawed slowly by laying insulation material or quickly by burying heating pipes. Step 4: After thawing is completed, based on the stripping depth determined in Step 1, the topsoil layer in the thawing area is stripped and collected in layers using a layered stripping device. Step 5: Transport the collected topsoil to the soil storage warehouse and stack it separately according to different soil layers; The layered stripping device includes a vehicle body. A stripping mechanism 1 and a stripping mechanism 2 are provided on the front side of the vehicle body. The stripping mechanism 1 includes a stripping cylinder 1 for stripping and collecting the topsoil. A pair of swing arms 1 are rotatably connected to the outer end of the stripping cylinder 1. An installation cylinder 1 is rotatably connected to the end of the swing arm 1 away from the stripping cylinder 1. The installation cylinder 1 is fixedly connected to the vehicle body. A conveying cylinder 1 is connected between the installation cylinder 1 and the stripping cylinder 1. The conveying cylinder 1 conveys the topsoil in the stripping cylinder 1 to the installation cylinder 1. A piston rod of a hydraulic cylinder 1 is hinged to one side wall of the swing arm. The cylinder barrel of the hydraulic cylinder 1 is hinged to the front end of the vehicle body. The second stripping mechanism has the same structure as the first stripping mechanism. The second stripping mechanism includes a second stripping cylinder, a second mounting cylinder, a second conveying cylinder, and a second swing arm. The piston rod of the second hydraulic cylinder is hinged to the side wall of the second swing arm, and the cylinder of the second hydraulic cylinder is hinged to the side wall of the first swing arm. The vehicle body has a first storage chamber and a second storage chamber. The first storage chamber is connected to the first mounting cylinder, and the second storage chamber is connected to the second mounting cylinder. The first and second storage chambers are used to store topsoil of different depths separately.

[0009] Furthermore, the stripping cylinder includes a cylinder body, with a feed inlet on the side wall of the cylinder body. A bucket fixedly connected to the side wall of the cylinder body is provided at the lower end of the feed inlet. A collecting cylinder concentrically connected to the inner wall of one side of the cylinder body is fixedly connected. A discharge port arranged along its axial direction is provided at the upper end of the collecting cylinder. A first annular cavity is formed between the outer wall of the collecting cylinder and the inner wall of the cylinder body. Multiple scrapers evenly distributed in a circle are provided in the first annular cavity. A rotating disk is fixedly connected to the left end of the scraper. The rotating disk is disposed in the cylinder body and rotatably sleeved on the left end of the collecting cylinder. The output shaft of a motor is fixedly connected to the left end of the rotating disk. The housing of the motor is fixedly connected to the outer wall of the cylinder body.

[0010] Furthermore, a material discharge hood connected to the material discharge port is fixedly connected to the inner wall of the collection cylinder. A longitudinal conveying cylinder is fixedly connected to the lower end of the material discharge hood. A spiral conveying roller is provided inside the longitudinal conveying cylinder. The left end of the spiral conveying roller is fixedly connected to the center of the side wall of the rotating disk. The longitudinal conveying cylinder extends to the outer side of the right end of the cylinder.

[0011] Furthermore, the conveying cylinder 1 includes an inclined cylinder, inside which is provided a spiral conveying roller 2. The upper end of the spiral conveying roller 2 is fixedly connected to the output shaft of motor 2, and the housing of motor 2 is fixedly connected to the upper outer wall of the inclined cylinder. The lower part of the inclined cylinder is fixedly connected to a receiving hood 1, and the upper end of the receiving hood 1 is fixedly connected to a receiving cylinder 1. The receiving cylinder 1 is rotatably connected to the outer end of the longitudinal conveying cylinder. The upper part of the inclined cylinder is fixedly connected to a receiving hood 2, and the lower end of the receiving hood 2 is fixedly connected to a receiving cylinder 2. The receiving cylinder 2 extends into the mounting cylinder 1 and is rotatably connected to the mounting cylinder 1. The receiving cylinder 2 is provided with a spiral conveying roller 3, and the end of the spiral conveying roller 3 is fixedly connected to a motor 3. The housing of motor 3 is fixedly connected to the outer side wall of the receiving cylinder 2.

[0012] Furthermore, the stripping mechanism also includes a hydraulic cylinder three. The front end of the piston rod of the hydraulic cylinder three is hinged to the outer wall of the cylinder body. The cylinder of the hydraulic cylinder three is hinged to a fixing plate, which is fixedly connected to the inner side wall of a pair of swing arms one.

[0013] Furthermore, a scraping block runs through the outer shell of the cylinder. The scraping block is used to scrape off the soil adhering to the inner wall of the material discharge hood. The piston rod of hydraulic cylinder four is hinged to the middle of the upper end of the scraping block. The cylinder barrel of hydraulic cylinder four is hinged to the outer wall of the cylinder. A pair of limiting plates that abut against the outer end of the scraping block are fixedly connected to the outer wall of the cylinder.

[0014] Furthermore, an arc-shaped groove is provided on the inner end face of the scraping block facing the longitudinal conveying cylinder. The curvature of the arc-shaped groove is equal to the curvature of the inner cavity of the longitudinal conveying cylinder. When the scraping block moves above the longitudinal conveying cylinder, the scraping block and the longitudinal conveying cylinder together enclose a cylindrical cavity with a circular cross-section.

[0015] Furthermore, the scraping block has a squeezing groove that extends through its lower part. The squeezing groove is connected to the arc-shaped groove. The squeezing groove is set in conjunction with the scraper. When the scraper is in the relative position of the squeezing groove, the hydraulic cylinder drives the scraping block to move towards the longitudinal conveying cylinder. During the movement, the scraper is inserted into the squeezing groove, so that the scraping block scrapes and cleans the side walls on both sides of the scraper, reducing the soil adhering to the scraper.

[0016] Compared with the prior art, the advantages of this invention are: (1) This invention peels the surface soil of frozen soil by layer-by-layer peeling, and then the peeled surface soil is stacked separately in the soil storage warehouse to avoid mixing of different soil layers during peeling and stacking, which would lead to nutrient imbalance and structural damage. In the backfilling stage, layered backfilling can restore the vertical profile structure of the soil, promote the layered development of plant roots and restore the function of soil and water conservation. In addition, the peeling depth of the two peeling mechanisms can be quickly adjusted and adapted by swing arm one, swing arm two, hydraulic cylinder one and hydraulic cylinder two, which is simple and efficient to operate. Furthermore, the tilt angle of the bucket can be finely adjusted by hydraulic cylinder three to further improve the adjustment accuracy of peeling depth.

[0017] (2) The present invention uses scrapers and scraping blocks to scrape and clean the soil adhering to the inner wall of the cylinder, the outer wall of the collection cylinder and the inner wall of the material discharge hood, thereby reducing the impact of soil stickiness on conveying efficiency; in addition, the arc groove and squeezing groove set on the scraping block, together with the spiral conveying roller, clean the soil adhering to the scraper and scraping block itself, thereby further improving the cleaning effect and conveying efficiency. Attached Figure Description

[0018] Figure 1 This is a flowchart illustrating the construction process of the present invention. Figure 2 This is a three-dimensional structural diagram of the layering and peeling device in this invention; Figure 3 This is a schematic diagram of the assembly structure of the peeling mechanism and the vehicle body in the layer peeling device of the present invention; Figure 4 This is a three-dimensional structural diagram of the peeling mechanism one in this invention; Figure 5 This is a schematic diagram of the peeling cylinder one and peeling cylinder two performing layered peeling of the surface soil in this invention; Figure 6 This is a three-dimensional structural diagram of the peeling cylinder in the invention; Figure 7 This is a schematic cross-sectional view of the peeling cylinder 1 in this invention; Figure 8 This is a schematic diagram of the longitudinal cross-sectional structure of the peeling cylinder one in this invention; Figure 9 This is a schematic diagram of the exploded assembly structure of the peeling cylinder one in this invention; Figure 10 This is a cross-sectional view of the scraping block in this invention; Figure 11 This is a schematic diagram of the exploded assembly structure of the conveyor cylinder one in this invention; Figure 12 This is a schematic diagram illustrating the adjustment of the bucket tilt angle in this invention; Figure 13 This is a schematic diagram showing the radial movement of the scraping block in this invention.

[0019] Explanation of the labels in the diagram: 1. Vehicle body; 101. Storage chamber one; 102. Storage chamber two; 2. Stripping mechanism one; 3. Stripping mechanism two; 4. Stripping cylinder one; 5. Swing arm one; 6. Mounting cylinder one; 7. Conveying cylinder one; 8. Hydraulic cylinder one; 9. Hydraulic cylinder two; 10. Swing arm two; 11. Cylinder body; 1101. Feed inlet; 12. Bucket; 13. Collection cylinder; 1301. Discharge port; 14. Discharge hood; 15. Longitudinal conveying cylinder; 16. Scraper; 17. Rotary disc ; 18. Rotating ring; 19. Motor 1; 20. Spiral conveyor roller 1; 21. Receiving cylinder 1; 22. Receiving cover 1; 23. Inclined cylinder; 24. Spiral conveyor roller 2; 25. Motor 2; 26. Receiving cover 2; 27. Receiving cylinder 2; 28. Spiral conveyor roller 3; 29. ​​Motor 3; 30. Hydraulic cylinder 3; 31. Fixing plate; 32. Scraping block; 3201. Arc groove; 3202. Extrusion groove; 33. Hydraulic cylinder 4; 34. Limiting plate. Detailed Implementation

[0020] The technical solutions will now be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention.

[0021] First implementation method Please see Figures 1-5 In one embodiment of the present invention, a method for stripping permafrost topsoil for alpine vegetation restoration includes the following steps: Step 1: Based on topographic and soil analysis, determine the stripping depth of the topsoil in the stripping operation area. Specifically, analyze the topographic slope of the operation area using satellite data or in-situ total station analysis to obtain topographic data. Divide the operation into operation units using a grid method and collect topsoil samples from 0-30 cm using the ring cutter method to test the organic matter content, pH value, nitrogen, phosphorus and potassium content, and soil bulk density, and draw a soil fertility distribution map. When confirming the stripping depth, the topsoil stripping thickness in plain areas is generally controlled at 25-35 cm, and in hilly areas with a slope exceeding 15°, it is reduced by 5-10 cm to avoid soil erosion caused by slope. Step two: At the selected location outside the stripping operation area, a soil storage warehouse is built using steel structure components and equipped with a drainage system; Specifically, topsoil is stockpiled in steel-structured soil storage warehouses to reduce moisture evaporation and increase soil microbial activity. Meanwhile, a drainage system prevents rainwater infiltration and reduces nutrient loss. Step 3, Pre-thawing of frozen soil: The soil in the area to be thawed is thawed slowly by laying insulation material or quickly by burying heating pipes. Step 4: After thawing is completed, based on the stripping depth determined in Step 1, the topsoil layer in the thawing area is stripped and collected in layers using a layered stripping device. Step 5: Transport the collected topsoil to the soil storage warehouse and stack it separately according to different soil layers; Please refer to Figure 2 and Figure 3 The layered stripping device includes a vehicle body 1. A stripping mechanism 1 2 and a stripping mechanism 2 3 are provided on the front side of the vehicle body 1. The stripping mechanism 1 2 includes a stripping cylinder 1 4 for stripping and collecting the topsoil. A pair of swing arms 1 5 are rotatably connected to the outer end of the stripping cylinder 1 4. An installation cylinder 1 6 is rotatably connected to the end of the swing arm 1 5 away from the stripping cylinder 1 4. The installation cylinder 1 6 is fixedly connected to the vehicle body 1. A conveying cylinder 1 7 is connected between the installation cylinder 1 6 and the stripping cylinder 1 4. The conveying cylinder 1 7 conveys the topsoil in the stripping cylinder 1 4 to the installation cylinder 1 6. The piston rod of a hydraulic cylinder 1 8 is hinged to the side wall of the swing arm 1 5. The cylinder of the hydraulic cylinder 1 8 is hinged to the front end of the vehicle body 1. The hydraulic cylinder 1 8 drives the swing arm 1 5 to swing. The swing arm 1 5 drives the stripping cylinder 1 4 to swing, thereby adjusting the vertical height of the stripping cylinder 1 4. Please see Figure 3 and Figure 4 The second stripping mechanism 3 has the same structure as the first stripping mechanism 2. The second stripping mechanism 3 includes a second stripping cylinder, a second mounting cylinder, a second conveying cylinder, and a second swing arm 10. The piston rod of the second hydraulic cylinder 9 is hinged to the side wall of the second swing arm 10. The cylinder of the second hydraulic cylinder 9 is hinged to the side wall of the first swing arm 5. The second hydraulic cylinder 9 drives the second swing arm 10 to swing, and the second swing arm 10 drives the second stripping cylinder to swing, thereby adjusting the vertical height of the second stripping cylinder relative to the first stripping cylinder 4. The vehicle body 1 has a first storage cavity 101 and a second storage cavity 102. The first storage cavity 101 is connected to the first mounting cylinder 6, and the second storage cavity 102 is connected to the second mounting cylinder. The first storage cavity 101 and the second storage cavity 102 are used to store the topsoil of different depths separately.

[0022] Compared to traditional topsoil stripping methods, this invention uses a layered stripping approach to peel the topsoil of frozen soil. The stripped topsoil is then stacked separately in a soil storage warehouse to prevent mixing of different soil layers during stripping and stacking, which could lead to nutrient imbalance and structural damage. During the backfilling stage, layered backfilling can restore the vertical profile structure of the soil, promote the layered development of plant roots, and restore soil and water conservation functions. At the same time, the stripping depth of the two stripping mechanisms can be quickly adjusted and adapted through swing arm 5, swing arm 10, hydraulic cylinder 8, and hydraulic cylinder 9, making the operation simple and efficient.

[0023] Please see Figures 6-8 The stripping cylinder 4 includes a cylinder body 11. A feed inlet 1101 is provided on the side wall of the cylinder body 11. A bucket 12 is fixedly connected to the lower end of the feed inlet 1101 and fixedly connected to the side wall of the cylinder body 11. A collecting cylinder 13 is fixedly connected to the inner wall of one side of the cylinder body 11 and is concentrically arranged with the cylinder body 11. A discharge port 1301 is provided at the upper end of the collecting cylinder 13 and is arranged along its axial direction. A first annular cavity is formed between the outer wall of the collecting cylinder 13 and the inner wall of the cylinder body 11. A plurality of scrapers 16 are provided in the first annular cavity and are evenly distributed in a circle. A rotating disk 17 is fixedly connected to the left end of the scraper 16. The rotating disk 17 is arranged inside the cylinder body 11 and is rotatably sleeved on the left end of the collecting cylinder 13. The output shaft of a motor 19 is fixedly connected to the left end of the rotating disk 17. The housing of the motor 19 is fixedly connected to the outer wall of the cylinder body 11.

[0024] Specifically, during the movement of the vehicle body 1, the bucket 12 shovels soil into the first annular cavity between the cylinder 11 and the collection cylinder 13. The motor 19 drives the rotating disk 17 to rotate, which in turn drives the scraper 16 to rotate in a circular motion. The rotating scraper 16 lifts the soil into the first annular cavity above the collection cylinder 13. Under the influence of gravity, the soil enters the collection cylinder 13 from the discharge port 1301, thus achieving soil collection. It should be noted that, in specific implementation, those skilled in the art can modify the cylinder 11 and the discharge port 1301. The dimensions of 101, 12, 13, and 1301 can be specifically set, such as reducing the size of the feed inlet 1101 and increasing the width of the first annular cavity (i.e., increasing the difference between the inner diameter of the cylinder 11 and the outer diameter of the collection cylinder 13), so that the soil entering between the adjacent scrapers 16 does not fill the space, allowing the soil to move within the first annular cavity under its own gravity during the upward rotation and lifting process, increasing its looseness, and also facilitating its falling into the collection cylinder 13 when it reaches the highest point of the feed inlet 1301.

[0025] Please see Figure 8 The outer wall of scraper 16 slides against the inner wall of cylinder 11, and the inner wall of scraper 16 slides against the outer wall of collecting cylinder 13. A rotating ring 18 is fixedly connected to the right end of scraper 16, and the rotating ring 18 is rotatably sleeved on the outer wall of collecting cylinder 13.

[0026] Specifically, the rotating discs 17 and rotating rings 18 at both ends of the scraper 16 improve the stability of the scraper 16 during rotation, thereby enhancing the cleaning effect on the soil adhering to the outer wall of the collection cylinder 13 and the inner wall of the cylinder 11.

[0027] Please see Figures 7-9 The inner wall of the collecting cylinder 13 is fixedly connected to a discharge hood 14 that communicates with the discharge port 1301. The lower end of the discharge hood 14 is fixedly connected to a longitudinal conveying cylinder 15. The longitudinal conveying cylinder 15 is provided with a spiral conveying roller 20. The left end of the spiral conveying roller 20 is fixedly connected to the center of the side wall of the rotating disk 17. The longitudinal conveying cylinder 15 extends to the outer side of the right end of the cylinder 11.

[0028] Specifically, the soil entering the collection cylinder 13 enters the longitudinal conveying cylinder 15 through the discharge hood 14. The motor 19 drives the rotating disk 17 to rotate, and the rotating disk 17 drives the spiral conveying roller 20 to rotate. The spiral conveying roller 20 pushes the soil in the longitudinal conveying cylinder 15 to move longitudinally and discharge it to the outside of the cylinder 11.

[0029] Please see Figure 4 , Figure 8 and Figure 11 The conveying cylinder 7 includes an inclined cylinder 23, inside which is a spiral conveying roller 24. The upper end of the spiral conveying roller 24 is fixedly connected to the output shaft of a motor 25. The housing of the motor 25 is fixedly connected to the upper outer wall of the inclined cylinder 23. The lower part of the inclined cylinder 23 is fixedly connected to a receiving cover 22. The upper end of the receiving cover 22 is fixedly connected to a receiving cylinder 21. The receiving cylinder 21 is rotatably connected to the outer end of the longitudinal conveying cylinder 15. The upper part of the inclined cylinder 23 is fixedly connected to a receiving cover 26. The lower end of the receiving cover 26 is fixedly connected to a receiving cylinder 27. The receiving cylinder 27 extends into the mounting cylinder 6 and is rotatably connected to the mounting cylinder 6. The receiving cylinder 27 is equipped with a spiral conveying roller 28. The end of the spiral conveying roller 28 is fixedly connected to a motor 29. The housing of the motor 29 is fixedly connected to the outer side wall of the receiving cylinder 27.

[0030] Specifically, after the soil is discharged from the longitudinal conveying cylinder 15, it enters the inclined cylinder 23 through the receiving cylinder 21 and the receiving cover 22. The motor 25 drives the spiral conveying roller 24 to rotate, and the spiral conveying roller 24 pushes the soil upward along the axial direction of the inclined cylinder 23. Then, it enters the receiving cylinder 27 through the receiving cover 26. The motor 39 drives the spiral conveying roller 38 to rotate, and the spiral conveying roller 38 pushes the soil from the receiving cylinder 27 into the installation cylinder 6, and then falls into the storage chamber 101.

[0031] Please see Figure 4 , Figure 7 and Figure 12The stripping mechanism 12 also includes a hydraulic cylinder 30. The front end of the piston rod of the hydraulic cylinder 30 is hinged to the outer wall of the cylinder 11. The cylinder of the hydraulic cylinder 30 is hinged to a fixing plate 31, which is fixedly connected to the inner side wall of a pair of swing arms 15.

[0032] Specifically, the extension and retraction of the hydraulic cylinder 30 drives the cylinder 11 to rotate, and the cylinder 11 drives the bucket 12 to rotate synchronously, adjusting the height and tilt angle of the bucket 12, improving the adjustment accuracy of the depth of the bucket 12 into the soil during operation, and improving the accuracy of layer stripping; it should be noted that the stripping mechanism 2 3 has the same structure as the stripping mechanism 1 2, and the stripping mechanism 2 3 is also equipped with the hydraulic cylinder 30 and the fixing plate 31.

[0033] In this embodiment, the bucket 12 is fixedly connected to the outer wall of the cylinder 11 by bolts. The bucket 12 has a pair of side plates at the front and rear ends, and the side plates are fixedly connected to the outer wall of the cylinder 11.

[0034] Specifically, the bucket 12 is fixed by bolts, which facilitates disassembly and replacement of the bucket 12. The two side plates improve the soil collection effect of the bucket 12.

[0035] Second implementation method Based on the first implementation, please refer to Figures 6-10 A scraper block 32 is inserted through the outer shell of the cylinder 11. The scraper block 32 is used to scrape off the soil adhering to the inner wall of the material discharge hood 14. The piston rod of the hydraulic cylinder 33 is hinged to the middle of the upper end of the scraper block 32. The cylinder barrel of the hydraulic cylinder 33 is hinged to the outer wall of the cylinder 11. A pair of limiting plates 34 are fixedly connected to the outer wall of the cylinder 11 and abut against the outer end of the scraper block 32.

[0036] Specifically, the piston rod of hydraulic cylinder 33 drives the scraper block 32 to be inserted into the material discharge hood 14 to scrape off the soil adhering to the inner wall of the material discharge hood 14. In addition, a Hall sensor is installed in motor 19. The Hall sensor is used to detect the rotation angle and rotation position of motor 19, and then to detect the rotation angle and rotation position of scraper 16. This ensures that when the scraper block 32 is inserted into the material discharge hood 14, the scraper 16 is away from the upper opening of the material discharge hood 14, thus avoiding collision between the scraper block 32 and the scraper 16.

[0037] Please see Figure 10 and Figure 13 An arc-shaped groove 3201 is provided on the inner end face of the scraping block 32 facing the longitudinal conveying cylinder 15. The curvature of the arc-shaped groove 3201 is equal to the curvature of the inner cavity of the longitudinal conveying cylinder 15. When the scraping block 32 moves above the longitudinal conveying cylinder 15, the scraping block 32 and the longitudinal conveying cylinder 15 together enclose a cylindrical cavity with a circular cross-section.

[0038] Specifically, when the scraping block 32 scrapes the inner wall of the material discharge hood 14, the adhering soil is more likely to slide into the arc-shaped groove 3201. When the scraping block 32 moves above the longitudinal conveying cylinder 15, the spiral conveying roller 20 rotates and contacts the inner wall of the arc-shaped groove 3201, and performs spiral scraping of the soil adhering to the inner wall of the arc-shaped groove 3201, further improving the cleaning effect of the adhering soil and reducing the soil adhering to the arc-shaped groove 3201.

[0039] Please see Figure 10 and Figure 13 The scraping block 32 has a squeezing groove 3202 that extends through its lower part. The squeezing groove 3202 is connected to the arc groove 3201. The squeezing groove 3202 is configured to cooperate with the scraper 16. When the scraper 16 is in the relative position of the squeezing groove 3202, the motor 19 is turned off and the hydraulic cylinder 33 drives the scraping block 32 to move towards the longitudinal conveying cylinder 15. During the movement, the scraper 16 is inserted into the squeezing groove 3202, so that the scraping block 32 scrapes and cleans the side walls of the scraper 16, reducing the soil adhering to the scraper 16.

[0040] Compared to traditional stripping methods, this invention uses a scraper 16 and a scraping block 32 to scrape and clean the soil adhering to the inner wall of the cylinder 11, the outer wall of the collection cylinder 13, and the inner wall of the discharge hood 14, reducing the impact of soil stickiness on conveying efficiency. In addition, the arc-shaped groove 3201 and the squeezing groove 3202 set on the scraping block 32, in conjunction with the spiral conveying roller 20, clean the soil adhering to the scraper 16 and the scraping block 32 themselves, further improving the cleaning effect and conveying efficiency.

[0041] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concepts, should be covered within the scope of protection of the present invention.

Claims

1. A method for stripping permafrost topsoil for alpine vegetation restoration, characterized in that, Includes the following steps: Step 1: Based on topographic and soil analysis, determine the stripping depth of the topsoil in the stripping operation area; Step two: At the selected location outside the stripping operation area, a soil storage warehouse is built using steel structure components and equipped with a drainage system; Step 3, Pre-thawing of frozen soil: The soil in the area to be thawed is thawed slowly by laying insulation material or quickly by burying heating pipes. Step 4: After thawing is completed, based on the stripping depth determined in Step 1, the topsoil layer in the thawing area is stripped and collected in layers using a layered stripping device. Step 5: Transport the collected topsoil to the soil storage warehouse and stack it separately according to different soil layers; Among them, the layer stripping device includes a vehicle body (1), and a stripping mechanism 1 (2) and a stripping mechanism 2 (3) are provided on the front side of the vehicle body (1). The stripping mechanism 1 (2) includes a stripping cylinder 1 (4) for stripping and collecting the topsoil. A pair of swing arms 1 (5) are rotatably connected to the outer end of the stripping cylinder 1 (4). An installation cylinder 1 (6) is rotatably connected to the end of the swing arm 1 (5) away from the stripping cylinder 1 (4). The installation cylinder 1 (6) is fixedly connected to the vehicle body (1). A conveying cylinder 1 (7) is connected between the installation cylinder 1 (6) and the stripping cylinder 1 (4). The conveying cylinder 1 (7) conveys the topsoil in the stripping cylinder 1 (4) to the installation cylinder 1 (6). The piston rod of the hydraulic cylinder 1 (8) is hinged to the side wall of the swing arm 1 (5). The cylinder of the hydraulic cylinder 1 (8) is hinged to the front end of the vehicle body (1). The second stripping mechanism (3) has the same structure as the first stripping mechanism (2). The second stripping mechanism (3) includes a second stripping cylinder, a second mounting cylinder, a second conveying cylinder, and a second swing arm (10). The piston rod of the second hydraulic cylinder (9) is hinged to the side wall of the second swing arm (10). The cylinder of the second hydraulic cylinder (9) is hinged to the side wall of the first swing arm (5). The vehicle body (1) is provided with a first storage chamber (101) and a second storage chamber (102). The first storage chamber (101) is connected to the first mounting cylinder (6), and the second storage chamber (102) is connected to the second mounting cylinder. The first storage chamber (101) and the second storage chamber (102) are used to store surface soil of different depths separately.

2. The method for stripping permafrost topsoil for alpine vegetation restoration according to claim 1, characterized in that, The stripping cylinder (4) includes a cylinder (11), a feed inlet (1101) is provided on the side wall of the cylinder (11), a bucket (12) is fixedly connected to the side wall of the cylinder (11) at the lower end of the feed inlet (1101), a collection cylinder (13) is fixedly connected to the inner wall of one side of the cylinder (11) and is concentrically arranged with the cylinder (11), a discharge port (1301) is provided at the upper end of the collection cylinder (13) along its axial direction, a first annular cavity is formed between the outer wall of the collection cylinder (13) and the inner wall of the cylinder (11), a plurality of scrapers (16) are evenly distributed in a circle in the first annular cavity, a rotating disk (17) is fixedly connected to the left end of the scraper (16), the rotating disk (17) is arranged in the cylinder (11) and rotated and sleeved on the left end of the collection cylinder (13), the output shaft of the motor (19) is fixedly connected to the left end of the rotating disk (17), and the housing of the motor (19) is fixedly connected to the outer wall of the cylinder (11).

3. The method for stripping permafrost topsoil for alpine vegetation restoration according to claim 2, characterized in that, The inner wall of the collecting cylinder (13) is fixedly connected to a discharge hood (14) that communicates with the discharge port (1301). The lower end of the discharge hood (14) is fixedly connected to a longitudinal conveying cylinder (15). The longitudinal conveying cylinder (15) is provided with a spiral conveying roller (20). The left end of the spiral conveying roller (20) is fixedly connected to the center of the side wall of the rotating disk (17). The longitudinal conveying cylinder (15) extends to the outer side of the right end of the cylinder body (11).

4. The method for stripping permafrost topsoil for alpine vegetation restoration according to claim 3, characterized in that, The first conveying cylinder (7) includes an inclined cylinder (23), inside which is a spiral conveying roller (24). The upper end of the spiral conveying roller (24) is fixedly connected to the output shaft of a motor (25), and the housing of the motor (25) is fixedly connected to the upper outer wall of the inclined cylinder (23). The lower part of the inclined cylinder (23) is fixedly connected to a receiving cover (22), and the upper end of the receiving cover (22) is fixedly connected to a receiving cylinder (21). The receiving cylinder (21) is connected to the outer end of the longitudinal conveying cylinder (15). The inclined cylinder (23) is connected to a material receiving cover (26) at the top and a material receiving cylinder (27) at the bottom. The material receiving cylinder (27) extends into the mounting cylinder (6) and is rotatably connected to the mounting cylinder (6). The material receiving cylinder (27) is provided with a spiral conveying roller (28) inside. The end of the spiral conveying roller (28) is fixedly connected to a motor (29). The housing of the motor (29) is fixedly connected to the outer side wall of the material receiving cylinder (27).

5. A method for stripping permafrost topsoil for alpine vegetation restoration according to claim 2, characterized in that, The stripping mechanism 1 (2) also includes a hydraulic cylinder 3 (30), the piston rod of the hydraulic cylinder 3 (30) is hinged to the outer wall of the cylinder (11), and the cylinder of the hydraulic cylinder 3 (30) is hinged to a fixing plate (31), which is fixedly connected to the inner wall of a pair of swing arms 1 (5).

6. The method for stripping permafrost topsoil for alpine vegetation restoration according to claim 3, characterized in that, A scraping block (32) runs through the outer shell of the cylinder (11). The scraping block (32) is used to scrape off the soil adhering to the inner wall of the material discharge hood (14). The piston rod of the hydraulic cylinder four (33) is hinged to the middle of the upper end of the scraping block (32). The cylinder of the hydraulic cylinder four (33) is hinged to the outer wall of the cylinder (11). A pair of limiting plates (34) that abut against the outer end of the scraping block (32) are fixedly connected to the outer wall of the cylinder (11).

7. A method for stripping permafrost topsoil for alpine vegetation restoration according to claim 6, characterized in that, The scraping block (32) has an arc-shaped groove (3201) on its inner end face facing the longitudinal conveying cylinder (15). The curvature of the arc-shaped groove (3201) is equal to the curvature of the inner cavity of the longitudinal conveying cylinder (15). When the scraping block (32) moves above the longitudinal conveying cylinder (15), the scraping block (32) and the longitudinal conveying cylinder (15) together enclose a cylindrical cavity with a circular cross-section.

8. A method for stripping permafrost topsoil for alpine vegetation restoration according to claim 7, characterized in that, The scraping block (32) has a squeezing groove (3202) that extends through its lower part. The squeezing groove (3202) is connected to the arc groove (3201). The squeezing groove (3202) is configured to cooperate with the scraper (16).

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