A large ridge double row seedling belt straw cleaning machine

Abstract

The utility model relates to a straw cleaning machine for big ridge double row seedling belt, and relates to the technical field of straw cleaning. The utility model discloses a straw cleaning rotary tiller rotating shaft parallel to the horizontal rotary cleaning mode of planting bed in the prior art, which can cause the back of straw to the planting area during the rotation process, and can cause the cleaning effect to be poor, the soil of the cleaning area to be wet and sticky, the straw to be adhered to the machine, the device to be out of order, the cleaning efficiency to be reduced and other problems. The utility model discloses a frame, a grass cleaning assembly, a grass pressing assembly and a chain tensioning assembly. The frame is provided with at least two grass cleaning assemblies along the length direction. The rear side of each grass cleaning assembly is provided with a plurality of grass pressing assemblies. The grass cleaning assembly is driven by a chain transmission mechanism. The chain tensioning assembly is arranged on the fixing frame of the grass cleaning assembly. The top of the frame is provided with a hanging frame. The utility model is used for the straw cleaning of seedling belt ridge.

Description

Technical Field

[0001] This utility model relates to the field of straw cleaning technology, specifically to a straw cleaning machine for double-row seedling belts on wide ridges. Background Technology

[0002] Straw is a general term for the stems and leaves of mature crops. It typically refers to the residue remaining after the grains of wheat, rice, corn, potatoes, cotton, and other crops are harvested. With the development of modern agriculture, crop harvesting efficiency has significantly improved, but the disposal of crop straw remains a significant issue. Currently, apart from a small amount used for livestock feed and some for composting, most straw is burned as fuel. Increased agricultural mechanization allows for various methods of straw processing to fully utilize its resource value, reduce environmental pollution, and improve the sustainability of agricultural production.

[0003] The existing straw cleaning devices have the following problems: Traditional straw cleaning devices are mostly horizontal rotary tillers with the rotating shaft parallel to the planting bed. During the rotation process, the straw is carried back into the planting area, which easily leads to poor cleaning effect. If the soil in the area is wet and sticky, the straw will also stick to the machine, which may further cause device failure and reduce straw cleaning efficiency. Straw cleaning devices mostly use chain drive structure. When operating for a long time, the chain will lengthen. When subjected to the impact of foreign objects in the straw, the chain is prone to skipping teeth, affecting the normal rotation of the sprocket, and in severe cases, the chain will break, causing the equipment to stop. Utility Model Content

[0004] The purpose of this invention is to address the problems in existing straw cleaning devices that mostly use chain drive structures. During long-term operation, the chain will lengthen, and the chain is prone to skipping teeth when subjected to impacts from foreign objects in the straw, affecting the normal rotation of the sprocket, and in severe cases, causing the chain to break and the equipment to stop. Therefore, this invention provides a straw cleaning machine with double rows of seedlings on a large ridge.

[0005] The technical solution adopted by this utility model to solve the above problems is: a straw cleaning machine for double-row seedlings on a large ridge, including a frame, a straw cleaning assembly, a straw pressing assembly, and a chain tensioning assembly; the frame is provided with at least two straw cleaning assemblies along its length, and multiple straw pressing assemblies are provided on the rear side of each straw cleaning assembly. The straw cleaning assembly is driven by a chain drive mechanism, and a chain tensioning assembly is provided on the chain drive mechanism; a hanging frame is provided on the top of the frame.

[0006] Furthermore, the grass-clearing assembly also includes a grass-clearing assembly mounting frame, a drive shaft, a driven shaft, and spring teeth. The chain drive mechanism includes a drive sprocket, a driven sprocket, and a spring-tooth chain. The drive shaft is rotatably mounted at one end of the grass-clearing assembly mounting frame, and the driven shaft is rotatably mounted at the other end of the grass-clearing assembly mounting frame. The drive sprocket is mounted on the drive shaft, and the driven sprocket is mounted on the driven shaft. The drive sprocket and the driven sprocket are connected by at least two rows of spring-tooth chains. Multiple spring-tooth frames are evenly spaced along the chain drive direction on the outer periphery of the spring-tooth chain. The two ends of each spring-tooth frame are fixed to the spring-tooth chain, and each spring-tooth frame is equipped with multiple spring teeth.

[0007] Furthermore, the grass-clearing assembly also includes a power unit mounted on the grass-clearing assembly mounting frame. The power unit is connected to the drive sprocket, which is rotatably mounted on the grass-clearing assembly mounting frame. The drive sprocket and the driven sprocket are driven by a transmission chain, and the driven sprocket is mounted at the end of the drive shaft.

[0008] Furthermore, a grass-cutting plate is provided on the frame along the length of the grass-cutting assembly fixing frame near the spring teeth. The grass-cutting plate is installed at the end of the grass-cutting assembly fixing frame where the power device is located. The grass-cutting plate includes a fixed straight plate, and the bottom of the fixed straight plate is provided with a plurality of arc-shaped grass-cutting teeth, which are correspondingly arranged with the spring teeth.

[0009] Furthermore, the weed-removing teeth are also provided with reinforcing ribs, the curvature of the weed-removing teeth faces the spring teeth, and a weed-clearing groove is formed between adjacent weed-removing teeth.

[0010] Furthermore, the spring tooth includes a spring portion, a long rod portion, and a hook-shaped portion; the spring portion is fixedly connected to the spring tooth frame, one end of the long rod portion is connected to the spring portion, and the other end is connected to the hook-shaped portion.

[0011] Furthermore, the hook-shaped part is oriented away from the transmission direction of the spring tooth chain, and the end of the hook-shaped part is set lower than the grass-cutting teeth in the vertical direction.

[0012] Furthermore, the chain tensioning assembly includes a tensioning wheel, a tensioning frame, and a handle; the tensioning frame is movably connected to the grass-clearing assembly fixing frame, and at least two tensioning wheels are provided on one side of the tensioning frame, and a handle is provided on the other side. A tensioning spring is provided between the handle and the grass-clearing assembly fixing frame; the axial direction of the tensioning wheel is parallel to the axial direction of the drive shaft, and the tensioning wheel contacts the slack side and tight side of the spring-tooth chain, respectively.

[0013] Furthermore, the grass pressing assembly includes a grass pressing assembly fixing frame fixed to the frame, and a grass pressing assembly is respectively provided at both ends of the grass clearing assembly fixing frame along its length. A grass pressing wheel unit is movably connected to the grass pressing assembly fixing frame.

[0014] Furthermore, the grass-pressing wheel unit includes an adjusting frame, a spring screw, a grass-pressing wheel arm, and a grass-pressing wheel. The grass-pressing wheel is arranged perpendicular to the spring-tooth chain. The upper end of the grass-pressing wheel arm is provided with a spring screw, and the lower end is rotatably connected to the grass-pressing wheel. The middle part of the grass-pressing wheel arm is hinged to the adjusting frame. One end of the spring screw is hinged to the grass-pressing wheel arm, and the other end passes through the waist-shaped hole on the adjusting frame. The part of the spring screw extending out of the adjusting frame is equipped with a shock-absorbing spring.

[0015] This utility model has the following beneficial technical effects. This utility model employs multiple spring tooth frames arranged at equal intervals along the outer periphery of two rows of chains. The multiple spring tooth frames and multiple spring teeth rotate synchronously with the two rows of chains. The continuous rotation of the two rows of chains drives the multiple spring teeth to push the straw for collection, thereby achieving straw cleaning.

[0016] In this invention, the two rows of chains are of the same specification, and each row of chains meshes separately with the driving sprocket and the driven sprocket. The two rows of chains rotate synchronously, and multiple spring teeth rotate stably through the two rows of chains. The two rows of chains are assembled on the driving sprocket and the driven sprocket to avoid damage in the event of equipment failure.

[0017] This utility model's grass-clearing assembly uses chain drive. A chain tensioning assembly is installed on the spring-tooth chain. The axial direction of the tensioning wheel of the chain tensioning assembly is parallel to the axial direction of the drive shaft. The tensioning wheel contacts the slack side and tight side of the spring-tooth chain respectively. The tensioning wheel keeps the chain in a taut state at all times, effectively preventing the chain from skipping teeth. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is the front view of this utility model; Figure 3 This is a top view of the present invention; Figure 4 This is a left view of the present invention; Figure 5 This is a rear view of the present invention; Figure 6 This is the southwest isometric view of the grass clearing assembly; Figure 7 This is the southeast isometric view of the grass clearing assembly; Figure 8 This is the front view of the grass-clearing assembly; Figure 9 This is a top view of the grass-clearing assembly; Figure 10 This is a left view of the grass-clearing assembly; Figure 11 This is a structural diagram of a weed trimming board; Figure 12 This is a schematic diagram of the chain tensioning assembly; Figure 13 This is the southwest isometric view of the straw pressing assembly; Figure 14 This is the southeast isometric view of the straw pressing assembly; Figure 15 This is a schematic diagram of the internal structure of the straw pressing assembly; In the diagram, 1. Hanging frame; 2. Grass-cleaning assembly; 3. Frame; 4. Grass-pressing assembly; 5. Grass-trimming plate; 510. Fixed straight plate; 520. Grass-trimming teeth; 530. Reinforcing rib; 540. Grass-cleaning trough; 6. Grass-cleaning assembly mounting base; 7. Grass-cleaning assembly mounting bracket; 8. Motor; 9. Drive sprocket; 10. Driven sprocket; 11. Drive chain; 12. Drive shaft; 13. Driven shaft; 14. Drive sprocket; 15. Driven sprocket; 16. Spring-loaded chain; 17. Spring-loaded bracket; 18. Spring tooth; 1810. Spring section; 1820. Long rod section; 1830. Hook-shaped section; 19. Adjusting bracket; 1910. Waist-shaped hole; 20. Spring screw; 21. Shock-absorbing spring; 22. Hay-pressing wheel arm; 23. Hay-pressing wheel; 24. Hay-pressing assembly fixing bracket; 25. Tensioner wheel; 26. Tensioner bracket; 27. Handle; 28. Tensioner spring. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. The specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0020] Specific implementation method one: Combining Figures 1 to 15 This embodiment describes a double-row seedling straw cleaner that includes a frame 3, a straw-cleaning assembly 2, a straw-pressing assembly 4, and a chain tensioning assembly. The frame 3 has at least two straw-cleaning assemblies 2 along its length, and each straw-cleaning assembly 2 has multiple straw-pressing assemblies 4 on its rear side. The straw-cleaning assemblies 2 are driven by a chain drive mechanism, and the chain drive mechanism is equipped with a chain tensioning assembly. A hanging frame 1 is provided on the top of the frame 3.

[0021] In a preferred embodiment, the grass-clearing assembly 2 further includes a grass-clearing assembly mounting frame 7, a drive shaft 12, a driven shaft 13, and spring teeth 18. The chain drive mechanism includes a drive sprocket 14, a driven sprocket 15, and a spring-tooth chain 16. The drive shaft 12 is rotatably mounted on one end of the grass-clearing assembly mounting frame 7, and the driven shaft 13 is rotatably mounted on the other end of the grass-clearing assembly mounting frame 7. The drive sprocket 14 is mounted on the drive shaft 12, and the driven sprocket 15 is mounted on the driven shaft 13. The drive sprocket 14 and the driven sprocket 15 are connected by transmission through at least two rows of spring-tooth chains 16. Multiple spring tooth frames 17 are evenly spaced along the chain transmission direction on the outer periphery of the spring-tooth chain 16. The two ends of the spring tooth frame 17 are fixedly connected to the spring-tooth chain 16, and each spring tooth frame 17 is equipped with multiple spring teeth 18. The spring teeth 18 are fixedly connected to the spring tooth frame 17 by bolts or welding. The rack 3 is equipped with a grass cleaning assembly mounting base 6. The grass cleaning assembly mounting bracket 7 and the grass cleaning assembly mounting base 6 are fixedly connected, and the grass cleaning assembly 2 and the rack 3 are connected through the grass cleaning assembly mounting base 6.

[0022] In a preferred embodiment, the straw-clearing assembly 2 further includes a power unit mounted on the straw-clearing assembly mounting frame 7. The power unit is connected to a drive sprocket 9, which is rotatably mounted on the straw-clearing assembly mounting frame 7. The drive sprocket 9 and the driven sprocket 10 are driven by a transmission chain 11. The driven sprocket 10 is mounted at the end of the drive shaft 12. The power unit is preferably a motor 8, which is mounted on the top of the straw-clearing assembly mounting frame 7. The drive sprocket 9 is mounted on the output shaft of the motor 8. In this embodiment, the straw-clearing assembly mounting frame 7 is provided with multiple shaft mounting holes. The distance between the drive shaft 12 and the driven shaft 13 on the straw-clearing assembly mounting frame 7 can be adjusted to adapt to the row spacing of different crops. Each straw-clearing assembly 2 can clear straw across at least two rows of seedbeds. The spacing between the multiple straw-clearing assemblies 2 arranged along the length of the frame 3 can also be adjusted.

[0023] In a preferred embodiment, a grass-cutting plate 5 is provided on the frame 3 along the length of the grass-cutting assembly fixing frame 7 near the spring teeth 18. The grass-cutting plate 5 is installed at the end of the grass-cutting assembly fixing frame 7 where the power device is located. The grass-cutting plate 5 includes a fixed straight plate 510, and a plurality of arc-shaped grass-cutting teeth 520 are provided at the bottom of the fixed straight plate 510. The grass-cutting teeth 520 are correspondingly arranged with the spring teeth 18.

[0024] In a preferred embodiment, the weed-removing teeth 520 are further provided with reinforcing ribs 530, the curvature of the weed-removing teeth 520 is directed toward the spring teeth 18, and weed-clearing grooves 540 are formed between adjacent weed-removing teeth 520.

[0025] In a preferred embodiment, the spring tooth 18 includes a spring portion 1810, a long rod portion 1820, and a hook-shaped portion 1830; the spring portion 1810 is fixedly connected to the spring tooth frame 17, one end of the long rod portion 1820 is connected to the spring portion 1810, and the other end is connected to the hook-shaped portion 1830.

[0026] In a preferred embodiment, the hook-shaped portion 1830 is oriented away from the transmission direction of the spring tooth chain 16, and the end of the hook-shaped portion 1830 is positioned vertically below the grass-cutting tooth 520.

[0027] In this embodiment, the weed-clearing board 5 has a weed-clearing groove 540 on its arc panel that matches multiple spring teeth 18, and two rows of spring tooth chains 16 are as follows: Figure 5 As shown, the multiple toothed frames 17 and toothed frames 18 rotate synchronously with the two rows of toothed chains 16. When the multiple toothed frames 18 move to the leftmost end of the bottom and rotate upwards with the two rows of toothed chains 16, the multiple toothed frames 18 pass through the grass-clearing trough 540. At the same time, there is a gap between the right edge of the grass-clearing plate 5 and the toothed chain 16 for the toothed frames 17 to pass through.

[0028] In this embodiment, multiple spring tooth frames 17 and spring teeth 18 rotate synchronously with the spring tooth chain 16. The two rows of spring tooth chains 16 drive multiple spring teeth 18 to clean the straw on the seedling ridge. When the spring teeth 18 move the straw to the area below the weeding plate 5, the weeding plate 5 removes the straw from the spring teeth 18, preventing the straw from being carried above the spring tooth chain 16, getting tangled inside the spring tooth chain 16, damaging the equipment, and affecting its operation.

[0029] In this embodiment, when straw gets tangled around the spring teeth 18, affecting the passage of the spring teeth 18 through the cleaning groove 540, the spring teeth 18 will rotate around the fixing screw under the action of resistance, compressing the spring part 1810. The fixing screw drives the spring part 1810 of the spring teeth 18 to continue rotating, and the long rod part 1820 continuously deflects downward. After the straw tangled around the spring teeth 18 slips off the spring teeth 18, the spring part 1810 drives the long rod part 1820 to reset. During the rotation of the multi-row spring tooth chain 16, the straw cleaning device will not cause the straw to be brought back to the planting area, and the cleaning is relatively clean, ensuring that the straw is evenly distributed in the farmland.

[0030] In this embodiment, the fixing screw between the spring tooth 18 and the spring tooth frame 17 is inserted into the spring part 1810, and then welded to the fixing screw spring tooth frame 17. The spring part 1810 is connected to the long rod part 1820, and the other end of the long rod part 1820 is connected to the hook-shaped part 1830. The bending direction of the hook-shaped part 1830 is opposite to the transmission direction of the spring tooth chain 16. Figure 8 The straw wrapped around the spring tooth 18 as shown slips off the spring tooth 18, while preventing the end of the hook-shaped part 1830 from colliding with the grass-cutting plate 5 and deforming.

[0031] Specific Implementation Method Two: Combining Figures 1 to 15 This embodiment describes a chain tensioning assembly comprising a tensioning wheel 25, a tensioning frame 26, and a handle 27. The tensioning frame 26 is movably connected to the grass-clearing assembly fixing frame 7. At least two tensioning wheels 25 are provided on one side of the tensioning frame 26, and a handle 27 is provided on the other side. A tensioning spring 28 is provided between the handle 27 and the grass-clearing assembly fixing frame 7. The axial direction of the tensioning wheel 25 is parallel to the axial direction of the drive shaft 12, and the tensioning wheel 25 contacts the slack side and the tight side of the toothed chain 16, respectively.

[0032] In this embodiment, the grass-clearing assembly 4 adopts chain drive. A chain tensioning assembly is installed on the spring-tooth chain 16. The tensioning wheel 25 of the chain tensioning assembly is arranged parallel to the axis of the drive shaft. The tensioning wheel 25 contacts the slack side and the tight side of the spring-tooth chain 16 respectively. The tensioning wheel 25 keeps the chain in a taut state at all times, preventing the chain from becoming too long after long-term operation and the sprocket from loosening, effectively preventing the chain from skipping teeth.

[0033] The other components and connections are the same as in Specific Implementation Method 1.

[0034] Specific implementation method three: Combining Figures 1 to 15 This embodiment describes the grass pressing assembly 4, which includes a grass pressing assembly fixing frame 24 fixed to the frame 3. A grass pressing assembly 4 is respectively provided at both ends of the grass clearing assembly fixing frame 7 along its length. A grass pressing wheel unit is movably connected to the grass pressing assembly fixing frame 24.

[0035] In a preferred embodiment, the grass-pressing wheel unit includes an adjusting frame 19, a spring screw 20, a grass-pressing wheel arm 22, and a grass-pressing wheel 23. The grass-pressing wheel 23 is arranged perpendicular to the spring-tooth chain 16. The upper end of the grass-pressing wheel arm 22 is provided with the spring screw 20, and the lower end is rotatably connected to the grass-pressing wheel 23. The middle part of the grass-pressing wheel arm 22 is hinged to the adjusting frame 19. One end of the spring screw 20 is hinged to the grass-pressing wheel arm 22, and the other end passes through the waist-shaped hole 1910 on the adjusting frame 19. The part of the spring screw 20 extending out of the adjusting frame 19 is equipped with a shock-absorbing spring 21.

[0036] In this embodiment, the rear end of the adjusting frame 19 of the straw pressing assembly 4 is provided with a shock-absorbing spring 21. The shock-absorbing spring 21 is used for the buffer protection of the straw pressing wheel 23. The straw pressing assembly 4 is installed at the rear of the straw clearing assembly 2. After the spring teeth 18 of the straw clearing assembly 2 clears the straw on the seedling ridge, the straw pressing wheel 23 presses the cleared straw into the soil to prevent the straw from returning to the ridge.

[0037] The working principle of this utility model: The spring teeth 18 of this utility model's straw-cleaning assembly are evenly spaced along the outer periphery of the spring tooth chain 16. Multiple spring teeth 18 rotate synchronously with the two rows of spring tooth chains 16. The continuous rotation of the spring tooth chains 16 drives the multiple spring teeth 18 to push and collect the straw, thus achieving straw cleaning. When the multiple spring teeth 18 move the straw to below the straw-trimming plate 5, the straw-trimming plate 5 removes the straw from the spring teeth 18, preventing the straw from being carried above the spring tooth chain 16, getting caught in the chain, damaging the equipment, and affecting its operation. A chain tensioning assembly is installed on the spring-tooth chain 16. The tensioning wheel 25 of the chain tensioning assembly is arranged parallel to the axis of the drive shaft. The tensioning wheel 25 contacts the slack side and the tight side of the spring-tooth chain 16 respectively. The tensioning wheel 25 keeps the chain in a taut state at all times, preventing the chain from becoming too long after long-term operation and the sprocket from loosening, effectively preventing the chain from skipping teeth.

[0038] The other components and connections are the same as in Specific Implementation Method 1.

[0039] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A straw-cleaning machine for double-row seedlings on wide ridges, characterized in that: The machine includes a frame (3), a grass-cleaning assembly (2), a grass-pressing assembly (4), and a chain tensioning assembly; the frame (3) has at least two grass-cleaning assemblies (2) along its length, and each grass-cleaning assembly (2) has multiple grass-pressing assemblies (4) on its rear side; the grass-cleaning assembly (2) is driven by a chain drive mechanism, and the chain drive mechanism is equipped with a chain tensioning assembly; a hanging frame (1) is provided on the top of the frame (3). The grass-clearing assembly (2) also includes a grass-clearing assembly fixing frame (7), a drive shaft (12), a driven shaft (13) and a spring tooth (18), and the chain drive mechanism includes a drive sprocket (14), a driven sprocket (15) and a spring tooth chain (16). The drive shaft (12) is rotatably mounted on one end of the grass-clearing assembly mounting frame (7), and the driven shaft (13) is rotatably mounted on the other end of the grass-clearing assembly mounting frame (7); the drive sprocket (14) is mounted on the drive shaft (12), and the driven sprocket (15) is mounted on the driven shaft (13). The drive sprocket (14) and the driven sprocket (15) are connected by at least two rows of spring-tooth chains (16). The outer periphery of the toothed chain (16) is provided with multiple toothed frames (17) at equal intervals along the chain transmission direction. The two ends of the toothed frames (17) are respectively fixed to the toothed chain (16), and each toothed frame (17) is equipped with multiple toothed frames (18).

2. The straw cleaning machine for double-row seedlings on large ridges according to claim 1, characterized in that: The grass-clearing assembly (2) also includes a power unit installed on the grass-clearing assembly mounting frame (7). The power unit is connected to the drive sprocket (9). The drive sprocket (9) is rotatably installed on the grass-clearing assembly mounting frame (7). The drive sprocket (9) and the driven sprocket (10) are driven by a transmission chain (11). The driven sprocket (10) is installed at the end of the drive shaft (12).

3. The straw cleaning machine for double-row seedlings on a large ridge according to claim 1, characterized in that: A grass-cutting plate (5) is provided on the frame (3) along the length of the grass-cutting assembly fixing frame (7) near the spring tooth (18). The grass-cutting plate (5) is installed at one end of the grass-cutting assembly fixing frame (7) where the power device is located. The grass-cutting plate (5) includes a fixed straight plate (510). The bottom of the fixed straight plate (510) is provided with a plurality of arc-shaped grass-cutting teeth (520). The grass-cutting teeth (520) and the spring tooth (18) are provided correspondingly.

4. The straw cleaning machine for double-row seedlings on a large ridge according to claim 3, characterized in that: The grass-cutting teeth (520) are also provided with reinforcing ribs (530), the curvature of the grass-cutting teeth (520) is directed toward the spring teeth (18), and grass-clearing grooves (540) are formed between adjacent grass-cutting teeth (520).

5. The straw cleaning machine for double-row seedlings on a large ridge according to claim 1, characterized in that: The spring tooth (18) includes a spring part (1810), a long rod part (1820) and a hook-shaped part (1830); the spring part (1810) is fixedly connected to the spring tooth frame (17), one end of the long rod part (1820) is connected to the spring part (1810), and the other end is connected to the hook-shaped part (1830).

6. The straw cleaning machine for double-row seedlings on a large ridge according to claim 5, characterized in that: The hook-shaped part (1830) is oriented away from the transmission direction of the spring tooth chain (16), and the end of the hook-shaped part (1830) is set lower than the grass-picking tooth (520) in the vertical direction.

7. The straw cleaning machine for double-row seedlings on a large ridge according to claim 1, characterized in that: The chain tensioning assembly includes a tensioning wheel (25), a tensioning frame (26), and a handle (27); the tensioning frame (26) is movably connected to the grass-clearing assembly fixing frame (7), and at least two tensioning wheels (25) are provided on one side of the tensioning frame (26) and a handle (27) is provided on the other side. A tensioning spring (28) is provided between the handle (27) and the grass-clearing assembly fixing frame (7). The tensioning wheel (25) is arranged parallel to the axial direction of the drive shaft (12), and the tensioning wheel (25) contacts the slack side and the tight side of the spring tooth chain (16) respectively.

8. The straw cleaning machine for double-row seedlings on a large ridge according to claim 1, characterized in that: The grass pressing assembly (4) includes a grass pressing assembly fixing frame (24) fixed on the frame (3). A grass pressing assembly (4) is provided at each end of the grass clearing assembly (7) along the length. A grass pressing wheel unit is movably connected to the grass pressing assembly fixing frame (24).

9. The straw cleaning machine for double-row seedlings on a large ridge according to claim 8, characterized in that: The grass pressing wheel unit includes an adjustment frame (19), a spring screw (20), a grass pressing wheel arm (22), and a grass pressing wheel (23), wherein the grass pressing wheel (23) is arranged perpendicular to the spring tooth chain (16); The upper end of the grass pressing wheel arm (22) is provided with a spring screw (20), and the lower end is rotatably connected to a grass pressing wheel (23). The middle part of the grass pressing wheel arm (22) is hinged to the adjusting frame (19). One end of the spring screw (20) is hinged to the grass pressing wheel arm (22), and the other end passes through the waist-shaped hole (1910) on the adjusting frame (19). The part of the spring screw (20) that extends out of the adjusting frame (19) is equipped with a shock-absorbing spring (21).

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