A dead stump pulling device for tree breeding and a method of using the same

Abstract

This invention provides a device for removing dead tree stumps used in forest tree breeding and its method of use. The device includes a support frame, movable wheels, a hydraulic rod, a lifting rod, and a clamping mechanism. Symmetrical movable wheels are arranged at the bottom of the support frame. One end of the lifting rod is rotatably connected to the upper end of the support frame, and the other end is connected to the clamping mechanism. The hydraulic rod is fixed inside the support frame, and its movable end is connected to the middle of the lifting rod via a hinge. The closed annular area formed by the first and second toothed clamps is adjusted by an adjusting component to fit the size of the dead tree stump. Compared with existing removal devices, this invention allows for convenient adjustment of the clamping mechanism size without repeated clamp replacements, improving the convenience and efficiency of tree stump removal.

Description

Technical Field

[0001] This invention relates to a tree stump removal device, and more particularly to a dead tree stump removal device for forest tree breeding and its method of use. Background Technology

[0002] Forest tree breeding, as a technology system centered on genetic improvement, is committed to cultivating superior forest tree varieties that are highly adaptable, fast-growing, and resilient through systematic selection, hybridization breeding, and molecular marker-assisted selection. This industry is based on genetics and integrates knowledge from multiple disciplines such as dendrology and forest ecology, forming a complete technology chain covering germplasm resource collection, genetic testing, and superior variety propagation.

[0003] In forest management practices, the removal of diseased and dead tree stumps is a crucial step in maintaining forest stand health. Research in the Qinling Mountains shows that the long-term presence of diseased and dead tree stumps can pose multiple ecological risks: their loose wood structure and low moisture content make them easy channels for surface fires to spread to crown fires; the organic matter released during decomposition can alter the soil microbial community structure; and some borers, such as longhorn beetles, may use the stumps as overwintering sites. Although tree species with strong natural regeneration capabilities can utilize some living stumps through root suckers, the decaying state of diseased and dead stumps renders them ecologically worthless and may instead become breeding grounds for pests and diseases. The current "Forest Harvesting and Regeneration Regulations" explicitly require that the stump height be controlled between 0-5 cm, aiming to improve the overall effectiveness of forests by reducing fire risk levels and pest and disease populations.

[0004] While existing electric push-rod type stake extraction devices can extract stakes through reaction force, they face significant technical bottlenecks in practical applications. These devices are designed based on the lever principle, applying a vertical upward pulling force to the stake via an electric push rod. Their efficiency is highly dependent on the fit between the clamping mechanism and the stake. However, forest stakes exhibit significant morphological differences: their diameters vary widely, with some broadleaf stakes having a maximum diameter exceeding the size of conventional clamps due to root plate enlargement; and the bark of decayed stakes is loose, making mechanical clamping prone to causing bark peeling and reducing the coefficient of friction. Therefore, existing devices have limitations in practical applications: multiple sets of replaceable clamps are required for stakes of different diameters, increasing operational complexity. Summary of the Invention

[0005] To overcome the drawback of existing tree stump removal devices where the clamps need to be changed immediately according to the size of the tree stump, which increases the difficulty of operation, this invention provides a dead tree stump removal device for forest tree breeding and its usage method.

[0006] The technical solution provided by this invention: A device for removing dead tree stumps for forest tree breeding, comprising a support frame, movable wheels, a hydraulic rod, a lifting rod, and a clamping mechanism. Symmetrical movable wheels are arranged at the bottom of the support frame. One end of the lifting rod is rotatably connected to the upper end of the support frame, and the other end is connected to the clamping mechanism. The hydraulic rod is fixed inside the support frame, and its movable end is connected to the middle of the lifting rod via a hinge. The clamping mechanism includes a bearing plate, a flexible chain, a first toothed clamp, a second toothed clamp, teeth, and an adjusting component. The bearing plate is rotatably connected to the end of the lifting rod. The bearing plate is connected to a semi-circular combination of the first and second toothed clamps via the flexible chain. The first and second toothed clamps are located within... The device has teeth evenly spaced, and an adjustment component is connected between the first and second toothed clamps. The adjustment component consists of a gear and a rack. The end of the first toothed clamp is rotatably connected to a gear, and the end of the second toothed clamp extends to a rack. The rack and gear are meshed. The closed ring formed by the first and second toothed clamps can surround and clamp the dead tree stump. Then, by activating the hydraulic rod, the lifting rod is lifted by lever, and the dead tree stump is pulled out by the clamping mechanism. Depending on the diameter of the tree stump, the gear can be rotated to extend or retract the rack, thereby adjusting the area of ​​the closed ring formed by the first and second toothed clamps to fit the size of the tree stump to be removed.

[0007] Furthermore, the flexible chain connecting the ends of the first and second toothed clamps is shorter, while the flexible chain connecting the middle of the first and second toothed clamps is longer, and the horizontal height of the ends of the first and second toothed clamps is higher than that of the middle.

[0008] Furthermore, the teeth slide through the first and second tooth clips, and are fixed by bolts, thus the teeth are replaceable.

[0009] Furthermore, it also includes a threaded insert and a handle. The threaded insert is threaded through the middle of the bearing plate, and the upper end of the threaded insert is fixed with a handle. By turning the handle, the threaded insert can be moved downwards, and the threaded insert can be rotated and inserted into the tree stump.

[0010] Furthermore, it also includes a ground anchor rod, which is slidably connected to the side of the support frame. The upper end of the ground anchor rod is flat and the lower end is pointed.

[0011] Furthermore, it also includes a multi-link chain, which is connected to the side of the first toothed clamp, and a fastener is connected to the side of the second toothed clamp. The multi-link chain can be fixed to the fastener by snapping.

[0012] Furthermore, it also includes an auxiliary grip, with an auxiliary grip provided on the side of the support frame.

[0013] Based on the aforementioned dead tree stump removal device for forest tree breeding, a method for using the dead tree stump removal device for forest tree breeding is proposed as follows:

[0014] S1, the staff moves the device to the dead tree stump so that the clamping mechanism is above the tree stump, and then inserts the anchor rod into the ground;

[0015] S2, depressurize the hydraulic rod so that the first and second toothed clamps of the clamping mechanism are fitted around the dead tree stump. Rotate the gear to adjust the size of the ring formed by the first and second toothed clamps to fit the size of the dead tree stump. After the first and second toothed clamps are tightly fitted to the outside of the dead tree stump, fasten the multi-ring chain and fasteners.

[0016] S3, rotate the handle to insert the threaded rod into the middle of the tree stump to assist the clamping mechanism in fixing the tree stump;

[0017] S4, the staff holds the auxiliary handle and activates the hydraulic rod, which drives the clamping mechanism to move upward, and the clamping mechanism removes the dead tree stump.

[0018] Compared with the prior art, the present invention has the following advantages: by adjusting the closed ring area formed by the first toothed clamp and the second toothed clamp, the size of the dead tree stump can be adapted. Compared with the existing removal device, the size of the clamping mechanism can be easily adjusted without repeatedly changing the clamps, thus improving the convenience and efficiency of tree stump removal. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0020] Figure 2 This is a three-dimensional structural diagram of the support frame, hydraulic rod, and clamping mechanism of the present invention.

[0021] Figure 3 This is a three-dimensional structural diagram of the clamping mechanism of the present invention.

[0022] Figure 4 This is a three-dimensional structural diagram of the adjustment component of the present invention.

[0023] Figure 5 This is a three-dimensional structural diagram of the threaded insert of the present invention.

[0024] Figure 6 This is a partial three-dimensional structural diagram of the threaded insert of the present invention.

[0025] Figure 7 This is a three-dimensional structural diagram of the ground anchor of the present invention.

[0026] Figure 8 This is a schematic diagram of the independent structure of the ground anchor of the present invention.

[0027] In the diagram: 1. Support frame, 2. Moving wheel, 3. Hydraulic rod, 4. Lifting rod, 5. Clamping mechanism, 6. Bearing plate, 7. Flexible chain, 801. First toothed clamp, 802. Second toothed clamp, 9. Tooth, 10. Gear, 11. Rack, 12. Threaded insert rod, 13. Handle, 14. Foot insert, 15. Multi-link chain, 16. Auxiliary grip. Detailed Implementation

[0028] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the present invention. In order to better illustrate the specific embodiments of the present invention, some parts in the drawings may be omitted, enlarged or reduced, and do not represent the actual product size. It is understandable for those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. Based on the specific embodiments of the present invention, all other specific embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] In the description of this invention, it should be noted that the terms "front", "rear", "upper", "lower", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0030] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0031] Example: A device for removing dead tree stumps used in forest tree breeding, such as Figures 1-7As shown, the device includes a support frame 1, movable wheels 2, hydraulic rods 3, lifting rods 4, and clamping mechanism 5. Symmetrical movable wheels 2 are arranged at the bottom of the support frame 1. The left end of the lifting rod 4 is rotatably connected to the upper part of the support frame 1, and the other end is connected to the clamping mechanism 5. The hydraulic rod 3 is fixed inside the support frame 1, and its movable end is connected to the middle of the lifting rod 4 via a hinge. The clamping mechanism 5 includes a bearing plate 6, a flexible chain 7, a first toothed clamp 801, a second toothed clamp 802, teeth 9, and an adjustment assembly. The bearing plate 6 is rotatably connected to the end of the lifting rod 4. The bearing plate 6 is connected to the semi-circular combination of the first toothed clamp 801 and the second toothed clamp 802 via the flexible chain 7. Teeth 9 are equidistantly arranged within the first toothed clamp 801 and the second toothed clamp 802. The teeth 9 slide through the first toothed clamp 801 and the second toothed clamp 802 and are fixed by bolts, thus making the teeth 9 replaceable. The device is designed to improve its lifespan and to accommodate different types of wood. An adjustment assembly, consisting of a gear 10 and a rack 11, connects the first clamp 801 and the second clamp 802. The gear 10 is rotatably connected to the end of the first clamp 801, and the rack 11 extends from the end of the second clamp 802. The rack 11 meshes with the gear 10. The closed ring formed by the first clamp 801 and the second clamp 802 can externally surround and clamp the dead tree stump. Then, by activating the hydraulic rod 3, the lifting rod 4 is lever-lifted, and the dead tree stump is pulled out through the clamping mechanism 5. Depending on the diameter of the tree stump, the gear 10 can be rotated to extend or retract the rack 11, thereby adjusting the area of ​​the closed ring formed by the first clamp 801 and the second clamp 802 to fit the size of the tree stump to be removed.

[0032] like Figure 1 and Figure 3 As shown, the flexible chain 7 connecting the ends of the first toothed clamp 801 and the second toothed clamp 802 is shorter, the flexible chain 7 connecting the middle of the first toothed clamp 801 and the second toothed clamp 802 is longer, and the horizontal height of the ends of the first toothed clamp 801 and the second toothed clamp 802 is higher than that of the middle.

[0033] like Figure 1 and Figure 6 As shown, it also includes a threaded rod 12 and a handle 13. The threaded rod 12 is threaded through the middle of the bearing plate 6. The handle 13 is fixed to the upper end of the threaded rod 12. By rotating the handle 13, the threaded rod 12 can be moved downward. After the clamping mechanism 5 clamps and fixes the dead tree stump, the threaded rod 12 can rotate and be inserted into the tree stump, further improving the fixing effect on the tree stump, thereby improving the removal effect of the tree stump.

[0034] like Figure 1 , Figure 7 and Figure 8As shown, it also includes a ground anchor 14. The ground anchor 14 is slidably connected to the side of the support frame 1. The ground anchor 14 has a flat top and a pointed bottom. Workers can insert the ground anchor 14 into the soil by stepping on the flat top part of the ground anchor 14, thereby fixing the support frame 1 and improving the stability of the device when removing tree stumps.

[0035] like Figure 1 and Figure 4 As shown, it also includes a multi-link chain 15, which is connected to the side of the first toothed clamp 801 and a fastener is connected to the side of the second toothed clamp 802. The multi-link chain 15 can be fixed to the fastener by snapping, thereby stabilizing the connection between the first toothed clamp 801 and the second toothed clamp 802.

[0036] like Figure 1 As shown, it also includes an auxiliary grip 16, which is provided on the side of the support frame 1.

[0037] Based on the above-mentioned dead tree stump removal device for forest tree breeding, its specific usage method is as follows: First, the worker moves the device to the dead tree stump using the auxiliary handle 16 on the side of the support frame 1, so that the clamping mechanism 5 is positioned above the stump. At this time, the symmetrical moving wheels 2 at the bottom of the support frame 1 facilitate the movement of the device, and the ground anchor 14, which is slidably connected to the side of the support frame 1, has a flat top and a pointed bottom. The worker inserts the ground anchor 14 into the soil by stepping on the flat top part of the ground anchor 14, thereby fixing the support frame 1 and improving the stability of the device when removing the tree stump. Next, the hydraulic rod 3 is depressurized, so that the lifting rod 4 of the clamping mechanism 5 moves the clamping mechanism 5 downward under the action of the hinge seat at the movable end of the hydraulic rod 3, allowing the first toothed clamp 801 and the second toothed clamp 802 to be fitted around the dead tree stump. The bearing plate 6 of the clamping mechanism 5 is rotatably connected to the end of the lifting rod 4. The bearing plate 6 is connected to a semi-circular combination of a first toothed clamp 801 and a second toothed clamp 802 via a flexible chain 7. Depending on the diameter of the tree stump, rotating the gear 10 rotatably connected to the end of the first toothed clamp 801 causes the rack 11, which is meshed with the gear 10, to extend or retract. This adjusts the area of ​​the closed ring formed by the first toothed clamp 801 and the second toothed clamp 802 to fit the size of the tree stump to be removed. After the first toothed clamp 801 and the second toothed clamp 802 are tightly fitted to the outside of the dead tree stump, the multi-ring chain 15 connected to the side of the first toothed clamp 801 is fastened to the fastener connected to the side of the second toothed clamp 802 to secure the connection between the first toothed clamp 801 and the second toothed clamp 802. Furthermore, the teeth 9 slide through the first toothed clamp 801 and the second toothed clamp 802, and are fixed by bolts. Therefore, the teeth 9 are replaceable, and different teeth 9 can be selected according to different plant wood types, thus improving the service life of the device. In addition, the threaded rod 12 is threaded through the middle of the bearing plate 6, and a handle 13 is fixed to the upper end of the threaded rod 12. By rotating the handle 13, the threaded rod 12 can be moved downwards. After the clamping mechanism 5 clamps and fixes the dead tree stump, the threaded rod 12 can rotate and insert into the tree stump, further improving the fixing effect on the tree stump, thereby improving the removal effect of the tree stump. The flexible chain 7 connecting the ends of the first toothed clamp 801 and the second toothed clamp 802 is relatively short, while the flexible chain 7 connecting the middle of the first toothed clamp 801 and the second toothed clamp 802 is relatively long, so that the horizontal height of the ends of the first toothed clamp 801 and the second toothed clamp 802 is higher than that of the middle. When the device is activated, the clamping mechanism 5 will move upward to remove the tree stump. From a mechanical point of view, when the ring formed by the first toothed clamp 801 and the second toothed clamp 802 is in an inclined state, the contact surface between the clamp and the tree stump will generate a component force along the axial direction of the tree stump and a normal component force perpendicular to the surface of the tree stump.When removing the tree stump, the axial component of the force acts directly on the stump, providing the main power to pull it out of the soil. The normal component, on the other hand, helps increase the friction between the clamp and the stump. According to the friction formula Ff=μFN (where Ff is the friction force, μ is the coefficient of friction, and FN is the normal force), the increase in the normal component leads to a corresponding increase in friction, thereby enhancing the clamp's stability over the stump and effectively preventing the stump from slipping out of the clamp during removal. Finally, the worker holds the auxiliary handle 16 and activates the hydraulic rod 3. The movable end of the hydraulic rod 3 drives the middle of the lifting rod 4 through the hinge seat, using the lever principle to lift the lifting rod 4. The lifting rod 4 then moves the clamping mechanism 5 upwards, and the clamping mechanism 5 removes the dead tree stump. This completes the removal of the dead tree stump.

[0038] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A dead stump pulling device for tree breeding, comprising a support frame (1), moving wheels (2), a hydraulic rod (3), a lifting rod (4) and a clamping mechanism (5), the bottom of the support frame (1) is provided with symmetrical moving wheels (2), one end of the lifting rod (4) is rotatably connected to the upper end of the support frame (1), the other end is connected with the clamping mechanism (5), the hydraulic rod (3) is fixed in the support frame (1), and the movable end of the hydraulic rod (3) is connected to the middle part of the lifting rod (4) through a hinge seat, characterized in that, The clamping mechanism (5) comprises a supporting disc (6), a flexible chain (7), a first toothed clamp (801), a second toothed clamp (802), a tooth (9) and an adjusting assembly. The supporting disc (6) is rotationally connected to the end of the lifting rod (4). The supporting disc (6) is connected with the first toothed clamp (801) and the second toothed clamp (802) in a semicircular combination through the flexible chain (7). The first toothed clamp (801) and the second toothed clamp (802) are equidistantly provided with the tooth (9) inside. The first toothed clamp (801) and the second toothed clamp (802) are connected with the adjusting assembly. The adjusting assembly is composed of a gear (10) and a rack (11). The end of the first toothed clamp (801) is rotationally connected with the gear (10). The end of the second toothed clamp (802) extends with the rack (11). The rack (11) and the gear (10) are in meshing state.

2. A dead stump puller for use in tree breeding according to claim 1, characterized in that, The flexible chain (7) connecting the ends of the first toothed clamp (801) and the second toothed clamp (802) is shorter. The flexible chain (7) connecting the middle parts of the first toothed clamp (801) and the second toothed clamp (802) is longer. The horizontal height of the ends of the first toothed clamp (801) and the second toothed clamp (802) is higher than that of the middle parts.

3. A dead stump puller for use in tree breeding according to claim 2, wherein The tooth (9) is slidingly connected to the first toothed clamp (801) and the second toothed clamp (802). The tooth (9) is fixed by bolts.

4. A dead stump puller for use in tree breeding according to claim 3, wherein It also comprises a threaded rod (12) and a handle (13). The threaded rod (12) is threaded into the middle part of the supporting disc (6). The upper end of the threaded rod (12) is fixedly connected with the handle (13).

5. A dead stump puller for use in tree breeding according to claim 4, wherein It also comprises a ground anchor (14). The ground anchor (14) is slidingly connected to the side of the support frame (1).

6. A dead stump puller for use in tree breeding according to claim 5, wherein It also comprises a multi-ring chain (15). The multi-ring chain (15) is connected to the side of the first toothed clamp (801). The second toothed clamp (802) is connected with a fastener. The multi-ring chain (15) can be fixed to the fastener by clamping.

7. A dead stump puller for use in tree breeding according to claim 6, characterized in that, It also comprises an auxiliary handle (16). The auxiliary handle (16) is arranged on the side of the support frame (1).

8. A method for using a dead stump pulling device for tree breeding, using the dead stump pulling device for tree breeding according to any one of claims 6-7, characterized in that, The following steps are included: S1, the device is moved to the dead stump, so that the clamping mechanism (5) is located above the stump, and then the ground anchor (14) is inserted into the ground; S2, the first toothed clamp (801) and the second toothed clamp (802) of the clamping mechanism (5) are sleeved on the periphery of the dead stump by releasing the pressure of the hydraulic rod (3). The size of the ring formed by the first toothed clamp (801) and the second toothed clamp (802) is adjusted by rotating the gear (10) to adapt to the size of the dead stump. After the first toothed clamp (801) and the second toothed clamp (802) are closely attached to the outside of the dead stump, the multi-ring chain (15) and the fastener are buckled tightly; S3, the threaded rod (12) is inserted into the middle part of the stump by rotating the handle (13) to assist the fixing effect of the clamping mechanism (5) on the stump; S4, the hydraulic rod (3) is started. The hydraulic rod (3) drives the clamping mechanism (5) to move upwards. The clamping mechanism (5) removes the dead stump.

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