A forestry afforestation land seedling protection device

Abstract

The application relates to the technical field of forestry seedling raising and afforestation, in particular to a forestry afforestation land seedling raising protection device. The device comprises at least three support rods which are arranged around the circumference of the trunk of a sapling and are inclined, with the top end close to the trunk and the bottom end away from the trunk; a connecting rod is fixedly connected between two adjacent support rods; a first friction plate is fixedly connected to the top of the support rod, and the top surface of the first friction plate is a first friction surface; a vertical shaft is fixedly connected to the center of the upper surface of the first friction plate, a second friction plate is rotatably arranged outside the vertical shaft, and the bottom surface of the second friction plate is a second friction surface; an elastic pressing mechanism is arranged on the vertical shaft, and the elastic pressing mechanism is used for outputting a pre-tightening force along the axial direction of the vertical shaft, so that the first friction surface and the second friction surface are tightly pressed and contacted and a damping torque is formed. The device can avoid the damage of the trunk epidermis caused by the trunk shaking or the radial growth of the trunk.

Description

Technical Field

[0001] This invention relates to the field of forestry seedling cultivation and afforestation technology, specifically to a seedling protection device for forestry afforestation sites. Background Technology

[0002] In my country's afforestation, ecological restoration, and urban and rural landscaping projects, young trees, whose root systems are not yet fully developed and whose lignification is insufficient, are highly susceptible to tilting and lodging. This is a core bottleneck restricting the survival rate of afforestation, the quality of timber, and the overall benefits of the project. With the continuous advancement of large-scale afforestation projects in my country, the industry has put forward three core requirements for tree support devices: first, they should effectively limit the complete lodging of trees and ensure the survival rate of afforestation; second, they should not restrict the normal radial growth of trees and should not cause physical damage to the trunk; and third, they should retain the mechanical stimulation necessary for tree growth, avoid causing support dependence, and improve the long-term wind resistance of trees.

[0003] However, the most widely used traditional support solution in the industry is a rigid hoop combined with multiple inclined support rods. This solution uses a closed rigid hoop to hold and fix the tree trunk to the outer circumference. At least three inclined support rods are evenly hinged to the outer wall of the hoop along the circumference. The bottom end of the support rod is anchored to the ground. The rigid holding of the hoop to the tree trunk and the inclined support of the support rods achieve tree protection against falling. However, this scheme has inherent and irreparable flaws: First, the closed-loop hard-contact structure has no radial clearance space. As the trunk diameter continues to thicken, the hoop will exert a continuous and intensifying rigid compression on the trunk. This can cause deep marks on the trunk surface and trunk deformity, or even sever the nutrient transport channels in the phloem, resulting in a girdling effect that weakens the tree or even kills it. Second, the fully rigid locking structure completely restricts all swaying and displacement of the trunk, depriving the tree of the mechanical stimulation necessary for growth from the breeze. This can easily lead to severe support dependence, resulting in insufficient lignification and poor root development. After the support is removed, the tree is extremely vulnerable to breakage and lodging in wind damage, completely violating the core purpose of seedling protection. Summary of the Invention

[0004] The purpose of this invention is to provide a seedling protection device for forest afforestation sites to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a seedling protection device for afforestation sites in forestry, used to support the trunk of seedlings, including at least three support rods surrounding the trunk, wherein the support rods are inclined, with their tops close to the trunk and their bottoms away from the trunk;

[0006] A connecting rod is fixedly connected between two adjacent support rods;

[0007] The top of the support rod is fixedly connected to a first friction plate, and its top surface is the first friction surface;

[0008] A vertical shaft is fixedly connected to the center of the upper surface of the first friction plate, and a second friction plate is rotatably arranged on the outside of the vertical shaft. The bottom surface of the second friction plate is the second friction surface.

[0009] An elastic clamping mechanism is provided on the vertical shaft. The elastic clamping mechanism is used to output a preload along the axial direction of the vertical shaft, so that the first friction surface and the second friction surface are tightly pressed together and form a damping torque.

[0010] A torsion spring is sleeved on the vertical shaft. The first pin of one end of the torsion spring is snapped and fixed on the vertical shaft, and the second pin of the other end of the torsion spring is snapped and fixed on the connecting rod.

[0011] The outer side of the second friction plate is provided with a one-way rotation mechanism, which only allows the connecting rod to rotate in one direction around the vertical axis. In use, the torsion spring is used to output torsional torque to drive the connecting rod to rotate in the direction allowed by the one-way rotation mechanism, so that one end of the connecting rod presses against the outer circumferential surface of the tree trunk. The damping torque between the first friction surface and the second friction surface is used to prevent the connecting rod from rotating in the direction not allowed by the one-way rotation mechanism around the vertical axis.

[0012] Preferably, the elastic clamping mechanism includes a threaded column, a hexagonal nut, and several springs, wherein the threaded column is coaxially sleeved and fixed on the outside of the vertical shaft, the hexagonal nut is threadedly connected to the threaded column, and several springs are sleeved on the vertical shaft and disposed between the hexagonal nut and the second friction plate.

[0013] Preferably, the unidirectional rotation mechanism includes a collar, a ratchet, ratchet teeth, and a straight spring. The collar is rotatably sleeved on the outside of the second friction plate via a bearing. The ratchet is coaxially and fixedly connected to the second friction plate, and the ratchet is located inside the collar. A slide is provided on the collar. The ratchet teeth are elastically slidably disposed inside the slide by the straight spring, and the ratchet teeth are engaged in the ratchet groove on the circumferential surface of the ratchet by the elastic force provided by the straight spring. The other end of the connecting rod is fixedly connected to the collar.

[0014] Preferably, a cover plate is fixedly installed at the end of the slide away from the ratchet, and one end of the straight spring is fixed to the cover plate.

[0015] Preferably, a protective cover is detachably mounted on the top of the collar, and the vertical shaft and the elastic clamping mechanism are both located in the sealed space between the protective cover and the second friction plate.

[0016] Preferably, a second limiting plate is fixed to the inner top of the protective cover, a first limiting plate is fixed to the circumference of the vertical shaft, a first pin at one end of the torsion spring is snapped and fixed to the first limiting plate, and a second pin at the other end of the torsion spring is snapped and fixed to the second limiting plate.

[0017] Preferably, the first limiting baffle is fixedly connected to the sleeve, and the sleeve is fixedly installed on the vertical shaft by fasteners.

[0018] Preferably, a threaded cylinder is coaxially fixed to the top of the collar, and the protective cover is threaded onto the threaded cylinder.

[0019] Preferably, a roller is rotatably mounted on one end of the connecting rod, and a rubber sleeve is fitted on the outer side of the roller body. The axial direction of the roller is parallel to the axial direction of the tree trunk.

[0020] Preferably, an inclined insert is fixed to the bottom surface of the first friction plate, and the top end of the support rod is inserted into the inside of the insert and locked by a locking bolt.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] This invention, through precise adjustment of the elastic clamping mechanism, creates a suitable damping torque between the first and second friction plates. Combined with a unidirectional rotation mechanism, it effectively buffers beneficial micro-swaying of the tree trunk, preventing damage to the trunk bark caused by excessive pressure from the connecting rod during the buffering process. Simultaneously, as the tree trunk grows radially, the damping torque between the first and second friction plates is overcome, causing the connecting rod to automatically rotate outward to make room, releasing complete radial space for trunk growth. This also avoids damage to the trunk bark caused by excessive pressure from the connecting rod, completely solving the inherent defects of traditional seedling protection devices. This application, by adjusting the damping torque between the first and second friction plates, allows for controlled, beneficial micro-swaying of the tree trunk in everyday light wind conditions. This provides essential mechanical stimulation for tree growth, effectively promoting the densification of the xylem and the establishment of a deep root network. Compared to traditional methods, saplings using this approach exhibit significantly improved xylem bending strength and root strength, and the risk of lodging under extreme wind damage after support removal is greatly reduced, fundamentally enhancing the long-term survival ability and timber quality of the trees. Furthermore, the related structures used in this technical solution can be recycled and reused, reducing actual costs. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the structure of the first friction plate, connecting rod, roller and protective cover of the present invention;

[0025] Figure 3 This is a schematic diagram of the structure of the collar and protective cover of the present invention;

[0026] Figure 4 This is a cross-sectional three-dimensional structural diagram of the collar and protective cover of the present invention;

[0027] Figure 5 This is a schematic diagram of the cutting and elastic clamping mechanism of the collar of the present invention;

[0028] Figure 6 This is a schematic diagram of the structure of the first friction plate, the second friction plate, the ratchet, and the torsion spring of the present invention;

[0029] Figure 7 This is a schematic diagram of the structure of the first friction plate, vertical shaft, threaded column and sleeve of the present invention;

[0030] Figure 8 This is a schematic diagram of the first friction plate, vertical shaft, and threaded column structure of the present invention;

[0031] Figure 9 This is a schematic diagram of the structure of the first friction plate, the second friction plate, and the elastic pressing mechanism of the present invention.

[0032] Figure 10 This is a schematic diagram of the unidirectional rotation mechanism of the present invention;

[0033] Figure 11 This is a top cross-sectional view of the unidirectional rotation mechanism of the present invention.

[0034] Figure 12 For the present invention Figure 11 A partial structural diagram.

[0035] In the diagram: 1. Tree trunk; 2. Support rod; 3. Connecting rod; 4. First friction plate; 5. Second friction plate; 6. Collar; 601. Slide rail; 7. Ratchet; 8. Ratchet tooth; 9. Straight spring; 10. Cover plate; 11. Vertical shaft; 12. Bearing; 13. Connecting rod; 14. Roller; 15. Protective cover; 16. Threaded cylinder; 17. Torsion spring; 18. Threaded column; 19. Hexagonal nut; 20. Spring leaf; 21. Sleeve; 22. First limit stop; 23. Second limit stop; 24. Insert; 25. Locking bolt. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Please see Figures 1-12 The present invention provides a technical solution:

[0038] A seedling protection device for forestry afforestation sites is used to support the trunk 1 of seedlings, thereby effectively preventing the seedlings from tilting or even falling over, and ensuring that the seedlings have a safe and stable growth environment.

[0039] The forestry afforestation seedling protection device includes at least three support rods 2 surrounding the trunk 1. In this embodiment, as shown in the figure, a total of three support rods 2 are provided, and the three support rods 2 are evenly arranged around the trunk 1. In other embodiments, the number of support rods 2 may be four or five, and the specific number is selected according to the actual situation.

[0040] like Figure 1 As shown, in this technical solution, the support rod 2 is inclined, with its top end close to the tree trunk 1 and its bottom end far from the tree trunk 1; the bottom end of the support rod 2 is anchored to the ground, so that it can work with the connecting rod 3 and the first friction plate 4 to achieve stable support for the tree trunk 1.

[0041] A connecting rod 3 is fixedly connected between two adjacent support rods 2. The connecting rod 3 and the support rod 2 can be connected and fixed with bolts. Of course, in this embodiment, the connecting rod 3 is fixed between two adjacent inserts 24. The three connecting rods 3 fix the three support rods 2 together to form a protective structure to prevent the trunk 1 from completely falling over. Specifically, in extreme weather conditions, such as strong winds, the trunk 1 of the sapling will not fall over completely, but will be limited to the maximum tilt angle by the connecting rods 3. At this angle, the sapling can still survive.

[0042] In this technical solution, the friction between the first friction plate 4 and the second friction plate 5 is mainly used to effectively support the tree trunk 1. For example, when the tree trunk 1 sways slightly in a breeze, the friction between the first friction plate 4 and the second friction plate 5 can effectively buffer and decelerate the tree trunk 1, allowing it to sway slightly without tilting directly to the maximum tilt angle (the maximum tilt angle is when the tree trunk 1 is in contact with the connecting rod 3), thus preserving the mechanical stimulation of the breeze on the tree trunk 1. At the same time, this solution also preserves radial clearance space, so that the tree trunk 1 will not be damaged when its diameter continues to increase. The specific solution is as follows:

[0043] The top of the support rod 2 is fixedly connected to a first friction plate 4, the top surface of which is the first friction surface; a vertical shaft 11 is fixedly connected to the center of the upper surface of the first friction plate 4, and the vertical shaft 11 and the first friction plate 4 can be fixed by welding or other means. A second friction plate 5 is rotatably set on the outside of the vertical shaft 11 through a bearing or other structure, and the bottom surface of the second friction plate 5 is the second friction surface.

[0044] Both the first friction plate 4 and the second friction plate 5 can be made of stainless steel, which has good rust resistance. The first friction plate 4 has a circular plate structure, while the second friction plate 5 has a ring structure. In this embodiment, the diameter of the first friction plate 4 and the outer diameter of the second friction plate 5 are equal.

[0045] An elastic clamping mechanism is provided on the vertical shaft 11. This mechanism outputs a preload along the axial direction of the vertical shaft 11, ensuring that the first friction surface and the second friction surface are tightly pressed together and form a damping torque. In actual use, this damping torque is used to buffer slight swaying of the trunk 1. Furthermore, as the trunk 1 thickens radially, this damping torque will not cause excessive compression to the bark of the trunk 1, and no manual maintenance is required, ensuring the healthy growth of the trunk 1.

[0046] A torsion spring 17 is fitted onto the vertical shaft 11. The torsion spring 17 has two leads. The first lead at one end of the torsion spring 17 is snapped and fixed onto the vertical shaft 11, and the second lead at the other end of the torsion spring 17 is snapped and fixed onto the connecting rod 13. In actual use, the torsion spring 17 needs to be twisted to a certain extent to generate a suitable torque, thereby pushing the connecting rod 13 against the tree trunk 1. In this embodiment, the maximum torque that the torsion spring 17 can generate should be less than the damping torque generated between the first friction surface and the second friction surface. During the entire support and buffering process, the damping torque between the first friction surface and the second friction surface is the core force used to buffer the tree trunk 1 and prevent the tree trunk 1 from tilting excessively, while the main function of the torque generated by the torsion spring 17 is to ensure that the connecting rod 13 can continuously press against the tree trunk 1, avoiding the phenomenon of separation between the connecting rod 13 and the tree trunk 1.

[0047] The outer side of the second friction plate 5 is provided with a one-way rotation mechanism. The one-way rotation mechanism only allows the connecting rod 13 to rotate in one direction around the axis of the vertical shaft 11. Here, the one-way rotation direction allowed by the one-way rotation mechanism can be defined as the clockwise direction. Therefore, the rotation direction not allowed by the one-way rotation mechanism is the counterclockwise direction.

[0048] In use, the torsion spring 17 is used to output torsional torque, which drives the connecting rod 13 to rotate in the direction allowed by the one-way rotation mechanism, that is, clockwise rotation, so that one end of the connecting rod 13 presses against the outer circumferential surface of the trunk 1; while the damping torque between the first friction surface and the second friction surface is used to prevent the connecting rod 13 from rotating in the direction not allowed by the one-way rotation mechanism around the vertical axis 11, that is, to prevent the connecting rod 13 from rotating counterclockwise around the vertical axis 11.

[0049] In practical use, by precisely adjusting the elastic clamping mechanism, a suitable damping torque can be formed between the first friction plate 4 and the second friction plate 5. Combined with a suitable torsion spring 17, this significantly reduces the damage to the tree trunk 1 caused by the connecting rod 13 during the buffering process. Specifically, in this application, the connecting rod 13 relies solely on the torsion spring 17 to maintain contact with the tree trunk 1. Therefore, as long as the torque generated by the torsion spring 17 is appropriate, excessive damage to the surface of the tree trunk 1 will not occur. During the entire support and protection process, the swaying of the tree trunk 1 is buffered by the damping torque between the first friction plate 4 and the second friction plate 5. For example, when the tree trunk 1 sways, the connecting rod 13 pushes the second friction plate 5 to slide relative to the first friction plate 4, generating sliding friction to effectively buffer the swaying of the tree trunk 1 and allowing the connecting rod 13 to make room, avoiding rigidity between the connecting rod 13 and the tree trunk 1. When the trunk 1 is compressed, the torsion spring 17 pushes the connecting rod 13 to press against the surface of the trunk 1 after the trunk 1 returns to its original position, preparing for the next sway of the trunk 1. During each sway of the trunk 1, the damping torque between the first friction plate 4 and the second friction plate 5 is basically equal. Therefore, the supporting force on the trunk is basically the same each time, and there is no situation where the supporting force fluctuates drastically. This eliminates the secondary compression and strangulation injury to the trunk 1 caused by a sudden increase in the supporting force. At the same time, the constant friction between the first friction plate 4 and the second friction plate 5 maintains the same buffering performance throughout the entire young forest period without the need for manual adjustment, further reducing management costs. This perfectly meets the long-term maintenance-free requirements of large-scale afforestation projects. Overall, as long as the magnitude of the friction between the first friction plate 4 and the second friction plate 5 is controlled, the connecting rod 13 will not cause serious damage to the trunk 1, protecting the safety of the trunk 1.

[0050] In the above solution, by precisely adjusting the elastic clamping mechanism, a suitable damping torque is formed between the first friction plate 4 and the second friction plate 5. Combined with the unidirectional rotation mechanism, the beneficial micro-swaying of the trunk 1 can be effectively buffered, avoiding damage to the bark of the trunk 1 caused by excessive squeezing force of the connecting rod 13 on the trunk 1 during the buffering process. At the same time, when the trunk grows radially, the connecting rod 13 can automatically rotate outward to make way by overcoming the damping torque between the first friction plate 4 and the second friction plate 5, releasing complete radial space for the trunk to grow. Similarly, it avoids damage to the bark of the trunk 1 caused by excessive squeezing force of the connecting rod 13 on the trunk 1, thus completely solving the inherent defects of traditional seedling protection devices. This application, by adjusting the damping torque between the first friction plate 4 and the second friction plate 5, allows the tree trunk 1 to undergo controllable and beneficial micro-swaying in normal light wind conditions, providing the necessary mechanical stimulation for tree growth. This effectively promotes the densification of the xylem and the establishment of a deep root network. Compared with traditional methods, the bending strength of the xylem and the root strength of saplings using this application are significantly improved, and the risk of lodging under extreme wind damage after the supports are removed is greatly reduced, fundamentally improving the long-term survival ability and timber quality of the trees. In addition, the related structures used in this technical solution can be recycled and reused, reducing actual costs.

[0051] In this technical solution, the elastic clamping mechanism includes a threaded post 18, a hexagonal nut 19, and several spring plates 20. The threaded post 18 is coaxially sleeved and fixed to the outside of the vertical shaft 11. In this embodiment, the threaded post 18 and the vertical shaft 11 are integrally formed, and the diameter of the threaded post 18 is larger than the diameter of the vertical shaft 11. The hexagonal nut 19 is threaded onto the threaded post 18, and several spring plates 20 are sleeved on the vertical shaft 11 and positioned between the hexagonal nut 19 and the second friction plate 5. By turning the hexagonal nut 19, the magnitude of the compressive force exerted by the first friction plate 4 on the second friction plate 5 can be adjusted. Since the magnitude of the frictional force between the first friction plate 4 and the second friction plate 5 is proportional to the magnitude of the compressive force, the technical objective of adjusting the magnitude of the frictional force between the first friction plate 4 and the second friction plate 5 is achieved.

[0052] In this technical solution, the unidirectional rotation mechanism includes a collar 6, a ratchet 7, a ratchet tooth 8, and a straight spring 9. The collar 6 is rotatably sleeved on the outside of the second friction plate 5 via a bearing 12. The collar 6 can be made of engineering plastic or stainless steel. The ratchet 7 is coaxially and fixedly connected to the second friction plate 5, for example, the ratchet 7 and the second friction plate 5 can be fixedly connected by bolts or other means. The ratchet 7 is located inside the collar 6, and a slide 601 is provided on the collar 6. The ratchet tooth 8 is elastically and slidably disposed inside the slide 601 via the straight spring 9, and the ratchet tooth 8 is engaged in the ratchet groove on the circumference of the ratchet 7 by the elastic force provided by the straight spring 9. The other end of the connecting rod 13 is fixedly connected to the collar 6.

[0053] Furthermore, a cover plate 10 is fixedly installed at the end of the slide 601 away from the ratchet 7, and one end of the straight spring 9 is fixed to the cover plate 10. This facilitates the installation and removal of the straight spring 9 and the ratchet 8.

[0054] A protective cover 15 is detachably mounted on the top of the collar 6. The vertical shaft 11 and the elastic clamping mechanism are both located in the sealed space between the protective cover 15 and the second friction plate 5. The detachable installation method of the protective cover 15 and the collar 6 is as follows: a threaded cylinder 16 is coaxially fixed to the top of the collar 6. The threaded cylinder 16 and the collar 6 are integrally formed, and the protective cover 15 is threadedly sleeved on the threaded cylinder 16.

[0055] A second limiting plate 23 is fixed to the inner top of the protective cover 15, a first limiting plate 22 is fixed to the circumference of the vertical shaft 11, a first pin of one end of the torsion spring 17 is snapped and fixed to the first limiting plate 22, and a second pin of the other end of the torsion spring 17 is snapped and fixed to the second limiting plate 23.

[0056] Furthermore, the first limiting stop 22 is fixedly connected to the sleeve 21, and the sleeve 21 is fixedly installed on the vertical shaft 11 by fasteners (e.g., screws).

[0057] In this technical solution, a roller 14 is rotatably mounted on one end of the connecting rod 13. A rubber sleeve is fitted on the outer side of the roller 14, which prevents rigid contact between the roller 14 and the surface of the tree trunk 1. The axial direction of the roller 14 is parallel to the axial direction of the tree trunk 1. In this embodiment, the extension line of the connecting rod 13 does not pass through the center of the tree trunk 1. Therefore, during slight shaking of the tree trunk 1 and during radial thickening of the tree trunk 1, the contact position between the roller 14 and the tree trunk 1 will change, preventing a certain position of the tree trunk 1 from being squeezed for a long time, and further helping to avoid damage to the bark of the tree trunk 1.

[0058] In this technical solution, an inclined insert 24 is fixed to the bottom surface of the first friction plate 4. Specifically, the insert 24 can be fixedly connected to the first friction plate 4 by welding or integral molding. The top end of the support rod 2 is inserted into the interior of the insert 24 and locked by locking bolts 25. Specifically, the support rod 2 can be made of wood, which has low production cost.

[0059] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A seedling protection device for forestry afforestation sites, used to support the trunk (1) of seedlings, characterized in that, Includes at least three support rods (2) surrounding the trunk (1), the support rods (2) being inclined with their tops close to the trunk (1) and their bottoms away from the trunk (1); A connecting rod (3) is fixedly connected between two adjacent support rods (2); The top of the support rod (2) is fixedly connected to a first friction plate (4), and its top surface is the first friction surface; A vertical shaft (11) is fixedly connected to the center of the upper surface of the first friction plate (4), and a second friction plate (5) is rotatably arranged on the outside of the vertical shaft (11). The bottom surface of the second friction plate (5) is the second friction surface. An elastic clamping mechanism is provided on the vertical shaft (11). The elastic clamping mechanism is used to output a preload along the axial direction of the vertical shaft (11) so that the first friction surface and the second friction surface are tightly pressed together and form a damping torque. A torsion spring (17) is sleeved on the vertical shaft (11). The first pin of one end of the torsion spring (17) is snapped and fixed on the vertical shaft (11), and the second pin of the other end of the torsion spring (17) is snapped and fixed on the connecting rod (13). The outer side of the second friction plate (5) is provided with a one-way rotation mechanism, which only allows the connecting rod (13) to rotate unidirectionally around the axis of the vertical axis (11). In use, the torsion spring (17) is used to output torsional torque to drive the connecting rod (13) to rotate in the direction allowed by the one-way rotation mechanism, so that one end of the connecting rod (13) presses against the outer circumferential surface of the trunk (1). The damping torque between the first friction surface and the second friction surface is used to prevent the connecting rod (13) from rotating in the direction not allowed by the one-way rotation mechanism around the vertical axis (11).

2. The forestry afforestation seedling protection device according to claim 1, characterized in that, The elastic clamping mechanism includes a threaded column (18), a hexagonal nut (19), and several springs (20). The threaded column (18) is coaxially sleeved and fixed on the outside of the vertical shaft (11). The hexagonal nut (19) is threaded onto the threaded column (18). Several springs (20) are sleeved on the vertical shaft (11) and are arranged between the hexagonal nut (19) and the second friction plate (5).

3. The forestry afforestation seedling protection device according to claim 1, characterized in that, The unidirectional rotation mechanism includes a collar (6), a ratchet (7), a ratchet tooth (8), and a straight spring (9). The collar (6) is rotatably sleeved on the outside of the second friction plate (5) via a bearing (12). The ratchet tooth (7) is coaxially fixedly connected to the second friction plate (5) and is located inside the collar (6). A slide (601) is provided on the collar (6). The ratchet tooth (8) is elastically slidably disposed inside the slide (601) via the straight spring (9). The ratchet tooth (8) is engaged in the ratchet groove on the circumference of the ratchet tooth (7) by the elastic force provided by the straight spring (9). The other end of the connecting rod (13) is fixedly connected to the collar (6).

4. A seedling protection device for forest afforestation land according to claim 3, characterized in that, A cover plate (10) is fixedly installed at the end of the slide (601) away from the ratchet (7), and one end of the straight spring (9) is fixed on the cover plate (10).

5. A seedling protection device for forest afforestation land according to claim 3, characterized in that, The top of the collar (6) is detachably fitted with a protective cover (15), and the vertical shaft (11) and the elastic clamping mechanism are both located in the sealed space between the protective cover (15) and the second friction plate (5).

6. A seedling protection device for forest afforestation land according to claim 5, characterized in that, The inner top of the protective cover (15) is fixed with a second limiting plate (23), the circumferential surface of the vertical shaft (11) is fixed with a first limiting plate (22), the first pin of one end of the torsion spring (17) is snapped and fixed on the first limiting plate (22), and the second pin of the other end of the torsion spring (17) is snapped and fixed on the second limiting plate (23).

7. A seedling protection device for forest afforestation land according to claim 6, characterized in that, The first limiting stop (22) is fixedly connected to the sleeve (21), and the sleeve (21) is fixedly installed on the vertical shaft (11) by fasteners.

8. A seedling protection device for forest afforestation land according to claim 5, characterized in that, The top of the collar (6) is coaxially fixed with a threaded cylinder (16), and the protective cover (15) is threadedly sleeved on the threaded cylinder (16).

9. A seedling protection device for forest afforestation land according to claim 1, characterized in that, One end of the connecting rod (13) is rotatably equipped with a roller (14), and the outer side of the roller (14) is fitted with a rubber sleeve. The axial direction of the roller (14) is parallel to the axial direction of the trunk (1).

10. A seedling protection device for forest afforestation land according to claim 1, characterized in that, The bottom surface of the first friction plate (4) is fixed with an inclined insert (24), and the top end of the support rod (2) is inserted into the inside of the insert (24) and locked by a locking bolt (25).

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