Labor-saving transmission mechanism for high-branch shears and pruning power head for high-branch shears

Abstract

The labor-saving transmission mechanism comprises a supporting body and a moving assembly, an arc-shaped supporting portion is arranged on the outer side of the upper right portion of the supporting body, the moving assembly comprises a large moving wheel and a small moving wheel, the small moving wheel is coaxially arranged on the large moving wheel, and the arc-shaped supporting portion is arranged on the outer side of the upper right portion of the supporting body. The small moving wheel and the large moving wheel rotate synchronously, and the small moving wheel can rotate and revolve synchronously on the arc-shaped supporting part. The pruning power head for the high branch shears comprises the labor-saving transmission mechanism for the high branch shears and a pruning knife, and the pruning knife is arranged on the supporting body in a hinged mode. According to the labor-saving transmission mechanism, force amplification can be achieved in a limited pruning operation space, and meanwhile high-altitude pruning of thick branches is facilitated due to the fact that a pruning opening is large.

Description

Technical Field

[0001] This utility model relates to the field of high branch pruning technology, specifically a force-saving transmission mechanism for high branch pruning and a pruning power head for high branch pruning. Background Technology

[0002] High-branch shears are tools used to prune the branches of tall trees or shrubs, and are widely used in landscaping, fruit tree pruning, forestry management and other fields.

[0003] Currently, most high-branch pruners use a direct lever principle to drive the blade's rotation. During pruning, the rotation of the blade cuts the branch while simultaneously reducing effort. However, this direct lever principle has several problems: 1. To further reduce effort, the blade needs to be longer. If the blade is too long, surrounding branches can obstruct the movement, making it difficult to find sufficient space for full rotation, thus reducing the flexibility of the high-branch pruners. 2. Existing high-branch pruners generally have a small pruning aperture, making it difficult to effectively prune thicker branches. Utility Model Content

[0004] The purpose of this utility model is to provide a force-saving transmission mechanism and a pruning power head for high-branch pruning. This force-saving transmission mechanism can amplify force within a limited pruning operation space. At the same time, its larger pruning opening is conducive to high-altitude pruning of thicker branches.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a force-saving transmission mechanism for high-branch pruning, including a support body and a moving component. An arc-shaped support part is provided on the outer side of the upper right part of the support body. The moving component includes a large moving wheel and a small moving wheel. The small moving wheel is coaxially arranged on the large moving wheel and rotates synchronously with the large moving wheel. The small moving wheel can rotate and revolve synchronously on the arc-shaped support part.

[0006] Preferably, the force-saving transmission mechanism further includes a support frame, the lower end of which is hinged to the support body, and the large and small moving wheels are hinged to the middle of the support frame.

[0007] Preferably, the arc-shaped support is an arc-shaped rack, the movable wheel is a gear, and the movable wheel meshes with the arc-shaped support.

[0008] Preferably, an annular groove is provided on the outer circumferential sidewall of the moving wheel, and a pull rope is wound in the annular groove.

[0009] Furthermore, three rope limiting posts are provided on the support frame, which are evenly distributed along the circumference of the moving wheel, and the rope limiting posts are located on the outside of the moving wheel.

[0010] A pruning power head for high-branch pruning shears includes the aforementioned labor-saving transmission mechanism for high-branch pruning shears. The power head also includes a pruning blade, the upper part of which is coaxially hinged to a small movable wheel. The pruning blade and the large movable wheel are located on the front and rear sides of a support body, respectively. The upper part of the pruning blade can move synchronously with the small movable wheel along the arc-shaped support portion. The middle part of the pruning blade is hinged to the support body, and the rotation axis of the pruning blade is coaxially distributed with the revolution axis of the small movable wheel. An arc-shaped cutting edge is provided on the lower left side of the pruning blade, and an arc-shaped branch-locking portion opposite to the arc-shaped cutting edge is fixedly provided on the left side of the support body.

[0011] Preferably, the rotation axis of the pruning knife is located inside the circle containing the arc-shaped support surface of the arc-shaped branch clamp.

[0012] Preferably, the large movable wheel, the small movable wheel, and the upper part of the pruning blade are coaxially hinged to a first hinge bolt.

[0013] Preferably, the middle part of the pruning blade is hinged to the support body by a second hinge bolt.

[0014] Furthermore, a torsion spring is fitted onto the second hinge bolt, the torsion spring being used to drive the pruning blade to rotate and swing back to the initial pruning position.

[0015] The beneficial effects of this utility model are: The utility model has a simple structure and is convenient to process and manufacture; when the large and small movable wheels rotate synchronously, the driving force is applied to the outer circular sidewall of the large movable wheel. Because the large movable wheel has a large diameter, its driving force arm is large, thus enabling the large movable wheel to transmit a large torque to the small movable wheel. The large rotational torque of the small movable wheel allows it to move smoothly on the arc-shaped support. While the small movable wheel moves smoothly on the arc-shaped support, it drives the pruning blade to swing, thus pruning the branches; because the large and small movable wheels occupy little space, they are convenient to use... This invention enables smooth pruning of branches within a limited cutting space. Because the central axis of the pruning blade's swing rotation is located within the circle of the arc-shaped branch clamp, the pruning blade's swing range relative to the arc-shaped branch clamp is relatively large, thus giving this invention a larger pruning opening. Furthermore, as the arc-shaped blade rotates and approaches the arc-shaped branch clamp, there is a longitudinal movement of the arc-shaped blade relative to the arc-shaped branch clamp. When the arc-shaped blade cuts the branch, the longitudinal movement of the arc-shaped blade is equivalent to applying a sawing action to the branch. The sawing action facilitates the cutting of the branch's fibrous tissue, thereby enabling smooth branch pruning. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some preferred embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the force-saving transmission mechanism for the high-branch pruning tool of this utility model.

[0018] Figure 2 This is a side view of the structure of the force-saving transmission mechanism for the high-branch pruning shears of this utility model;

[0019] Figure 3 A schematic diagram of a specific embodiment of a force-saving transmission mechanism for high-branch pruners;

[0020] Figure 4 A schematic diagram of the pruning power head for high-branch pruning shears;

[0021] Figure 5 This is a schematic diagram showing the relative distribution of the circles containing the rotation axis of the pruning blade and the arc-shaped support surface of the arc-shaped support part;

[0022] Figure 6 A schematic diagram showing the rotation and displacement of the curved blade of a pruning knife on the supporting body;

[0023] In the figure: 1 Support body, 11 Arc-shaped support part, 12 Arc-shaped branch clamping part, 121 Arc-shaped support surface, 122 Circle, 123 Rotary through hole, 1231 Rotary shaft of pruning knife, 21 Moving large wheel, 211 Annular groove, 212 Gear groove, 22 Moving small wheel, 3 Support frame, 31 Pull rope limiting post, 4 Pruning knife, 41 Arc-shaped blade, 5 Pull rope, 6 First hinge bolt, 7 Second hinge bolt, 8 Torsion spring. Detailed Implementation

[0024] The following will describe specific embodiments and appendices. Figure 1-6 The technical solutions in the embodiments of this utility model are clearly and completely described below. Obviously, the described embodiments are only some preferred embodiments of this utility model, and not all embodiments. Those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0025] This utility model provides a force-saving transmission mechanism for high-branch pruning (such as...). Figure 1 As shown, the system includes a support body 1 and a moving component 2. An arc-shaped support part 11 is provided on the outer side of the upper right part of the support body 1. The moving component includes a large moving wheel 21 and a small moving wheel 22. The small moving wheel 22 is coaxially arranged on the large moving wheel 21 and rotates synchronously with the large moving wheel 21. The small moving wheel 22 can rotate and revolve synchronously on the arc-shaped support part 11. In actual application, the driving force for rotating the large moving wheel 21 is applied to the outer circular sidewall of the large moving wheel 21. Therefore, the rotation of the large moving wheel 21... The driving arm is related to the diameter of the large movable wheel 21. The larger the diameter of the large movable wheel 21, the larger its driving arm. Therefore, when driving the large movable wheel 21, a smaller driving force can be applied. The small movable wheel 22 rotates synchronously with the large movable wheel 21. The rotation of the large movable wheel 21 enables the transmission of a large torque to the small movable wheel 22. The small movable wheel 22 has a large rotational driving torque, which gives it a strong rotational ability. This facilitates the use of the rotation of the small movable wheel 22 to achieve the revolution of the entire moving component on the arc-shaped support 11.

[0026] Based on the above embodiments, in order to facilitate the revolution and rotation of the moving component on the arc-shaped support 11, the force-saving transmission mechanism further includes a support frame 3. The lower end of the support frame 3 is hinged to the support body 1. The large moving wheel 21 and the small moving wheel 22 are hinged to the middle position of the support frame 3. By using the hinged connection of the support frame 3 to the support body 1, the large moving wheel 21 and the small moving wheel 22 can synchronously revolve around the arc-shaped support 11. By using the hinged arrangement of the large moving wheel 21 and the small moving wheel 22 on the support frame 3, it is convenient to realize the rotational movement of the large moving wheel 21 and the small moving wheel 22.

[0027] Based on the above embodiments, this specific embodiment designs two specific embodiments in which the large movable wheel 21 and the small movable wheel 22 are combined with the arc-shaped support part 11. The first specific embodiment in which the large movable wheel 21 and the small movable wheel 22 are combined with the arc-shaped support part 11 is implemented as follows: the arc-shaped support part 11 is an arc-shaped rack, and the small movable wheel 22 is a gear. The small movable wheel 22 meshes with the arc-shaped support part 11. During the rotation of the small movable wheel 22 driven by the large movable wheel 21, the small movable wheel 22 synchronously revolves on the arc-shaped support part 11 by utilizing the transmission characteristics of the gear meshing between the small movable wheel 22 and the arc-shaped support part 11. Furthermore, the specific implementation of the combination of the small movable wheel 22 and the large movable wheel 21 is as follows: a gear groove that cooperates with the small movable wheel 21 is provided in the middle of the large movable wheel 21. 212. Half of the thickness of the movable small wheel 22 is fixedly engaged in the gear groove 212 by an interference fit, thereby ensuring that the movable small wheel 22 rotates synchronously with the movable large wheel 21. The second specific embodiment in which the movable large wheel 21 and the movable small wheel 22 are combined with the arc-shaped support part 11 is as follows: The arc-shaped support part 11 is an arc-shaped support surface with a rubber pad. The movable small wheel 22 is a small rubber wheel. The movable small wheel 22 and the movable large wheel 21 can be coaxially fixed on a support shaft. The synchronous rotation of the movable small wheel 22 and the movable large wheel 21 is achieved by the transmission action of the support shaft. During the rotation of the movable small wheel 22 and the movable large wheel, the friction between the movable small wheel 22 and the arc-shaped support part 11 is used to synchronously achieve the revolution movement of the movable small wheel 22 on the arc-shaped support part 11. In this specific embodiment, the first specific embodiment in which the movable large wheel 21 and the movable small wheel 22 are combined with the arc-shaped support part 11 is preferred.

[0028] Based on the first specific embodiment in which the large movable wheel 21 and the small movable wheel 22 are combined with the arc-shaped support part 11, the specific implementation method for driving the rotation of the large movable wheel 21 is as follows: an annular groove 211 is provided on the outer circumferential side wall of the large movable wheel 21, and a pull rope 5 is wound in the annular groove 211. In actual application, by pulling the free end of the pull rope 5, the large movable wheel 21 can be rotated, and the rotation of the large movable wheel 21 synchronously drives the rotation of the small movable wheel 22. Furthermore, in order to facilitate the orderly winding of the pull rope 5 in the annular groove 211, three pull rope limiting posts 31 are provided on the support frame 3, which are evenly distributed along the circumference of the large movable wheel 21. The pull rope limiting posts 31 are located on the outside of the large movable wheel 21. The three pull rope limiting posts 31 press and limit the pull rope in the annular groove 211, so that the wound pull rope will not become loose, and thus effectively prevent the pull rope from tangling during actual pruning operations.

[0029] This utility model provides a power head for high-branch pruning (such as...) Figure 4As shown), the pruning power head includes the aforementioned high-branch pruning shears' force-saving transmission mechanism. The pruning power head also includes a pruning blade 4. The upper part of the pruning blade 4 is coaxially hinged to the movable small wheel 22. The pruning blade 4 and the movable large wheel 21 are located on the front and rear sides of the support body 1, respectively. The upper part of the pruning blade 4 can move synchronously with the movable small wheel 22 along the arc-shaped support part 11. The middle part of the pruning blade 4 is hinged to the support body 1, and the rotation axis of the pruning blade 4 is coaxially distributed with the revolution axis of the movable small wheel 21. Specifically, the movable large wheel 21 and the movable small wheel 22... A through hole is provided in the middle of the small wheel 22 and the upper part of the pruning blade 4. A first hinge bolt 6 is used to pass through the through holes provided in the large moving wheel 21, the small moving wheel 22 and the pruning blade 4 in sequence, thereby realizing the coaxial hinge connection of the large moving wheel 21, the small moving wheel 22 and the pruning blade 4. A rotary through hole 123 corresponding to the through hole in the middle area of ​​the pruning blade 4 is provided on the support body 1. A through hole corresponding to the rotary through hole 123 is provided in the lower part of the support frame 3. A second hinge bolt 7 is used to pass through the through hole in the lower part of the support frame 3, the rotary through hole 123 and the through hole in the middle area of ​​the pruning blade 4 in sequence, thereby realizing the pruning... The pruning shears 4 and the support frame 3 are coaxially hinged on the support body 1. Simultaneously, because the large moving wheel 21 and the small moving wheel 22 are hinged on the support frame 3, the rotation axis of the pruning shears 4 is coaxially distributed with the revolution axis of the small moving wheel 21. Therefore, when the small moving wheel 22 revolves on the arc-shaped support part 11, it synchronously drives the pruning shears 4 to rotate freely around the first hinge bolt 7. An arc-shaped blade 41 is provided on the lower left side of the pruning shears 4. An arc-shaped branch-locking part 12, opposite to the arc-shaped blade 41, is fixedly provided on the left side of the support body 1. When the arc-shaped blade 41 moves away from the arc... When the branch is clamped at the 12th slit, a pruning notch is formed between the arc-shaped blade 41 and the arc-shaped surface 121 of the branch clamping part 12. After the branch is clamped into the pruning notch, the pruning blade 4 is rotated to move closer to the arc-shaped surface 121, thereby cutting the branch clamped into the pruning notch. In practical applications, to facilitate the realization of a larger pruning notch in this invention, and to ensure that the arc-shaped blade 41 has a sawing effect on the branch during the cutting movement, the rotation axis 1231 of the pruning blade is located inside the circle 122 where the arc-shaped support surface 121 of the branch clamping part 12 is located. Figure 6As shown, when a marker on the curved blade 41 moves from position A to position B as the pruning blade 4 rotates, it can be observed that the marker moves not only laterally but also longitudinally relative to the curved support surface 121. Lateral movement of the curved blade 41 relative to the curved support surface 121 results in direct compression cutting of the branch, while longitudinal movement of the curved blade 41 relative to the curved support surface 121 results in sawing cutting of the branch. Furthermore, when the curved blade 41 swings to cut the branch, the simultaneous action of compression cutting and sawing cutting makes it easier to sever the branch.

[0030] Furthermore, in practical applications, when the pull rope 5 is used to pull the moving wheel 21 to rotate, the pull rope also applies a downward pulling force to the moving wheel 21. The downward pulling of the pull rope 5 also facilitates the downward swinging movement of the upper end of the pruning blade 4. Since the pull rope 5 is generally pulled by hand during pruning, pulling the pull rope 5 simultaneously utilizes the gravity of the hand, thus further realizing labor-saving pruning operations.

[0031] During pruning operations, to facilitate the smooth return of the pruning blade 4 to its initial pruning position after completing a pruning operation, a torsion spring 8 is fitted onto the second hinge bolt 7. The torsion spring 8 is used to drive the pruning blade 4 to rotate and swing back to the initial pruning position. Specifically, one end of the torsion spring 8 is secured to the support body 1, and the other end is secured to the support frame 3. During the pruning process, the rotation of the support frame 3 causes the torsion spring 8 to be compressed and retracted. After the pruning is completed and the pull rope 5 is released, the compression force of the torsion spring 8 is released. Then, during the resetting process of the torsion spring 8, the support frame 3 is pushed. During the swinging return process of the support frame 3, the moving wheel 21 is simultaneously driven to rotate. During the rotation of the moving wheel 21, the pull rope 5 is rewound.

[0032] In this utility model, "upper", "lower", "front", "back", "left", and "right" are all relative positions used to facilitate the description of positional relationships, and therefore cannot be understood as absolute positions as limitations on the scope of protection.

[0033] Except for the technical features described in the specification, all other technologies are known to those skilled in the art.

[0034] The preferred embodiments and examples of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments and examples. For those skilled in the art, several improvements and modifications can be made without departing from the concept of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A force-saving transmission mechanism for high-pole shears, characterized in that, The device includes a support body and a moving component. An arc-shaped support part is provided on the outer side of the upper right part of the support body. The moving component includes a large moving wheel and a small moving wheel. The small moving wheel is coaxially arranged on the large moving wheel and rotates synchronously with the large moving wheel. The small moving wheel can rotate and revolve synchronously on the arc-shaped support part.

2. The force-saving transmission mechanism for high-branch pruners according to claim 1, characterized in that, The force-saving transmission mechanism also includes a support frame, the lower end of which is hinged to the support body, and the large and small moving wheels are hinged to the middle of the support frame.

3. The force-saving transmission mechanism for high-branch pruning shears according to claim 1, characterized in that, The arc-shaped support is an arc-shaped rack, and the movable wheel is a gear, which meshes with the arc-shaped support.

4. The force-saving transmission mechanism for high-branch pruners according to claim 1, characterized in that, An annular groove is provided on the outer circumferential sidewall of the moving wheel, and a pull rope is wound inside the annular groove.

5. The force-saving transmission mechanism for high-branch pruners according to claim 2, characterized in that, Three rope limiting posts are provided on the support frame, which are evenly distributed along the circumference of the moving wheel, and the rope limiting posts are located on the outside of the moving wheel.

6. A pruning power head for high-branch pruners, characterized in that, The pruning power head includes a power-saving transmission mechanism for high-branch pruning according to any one of claims 1-5. The pruning power head also includes a pruning blade. The upper part of the pruning blade is coaxially hinged to the moving small wheel, and the pruning blade and the moving large wheel are respectively located on the front and rear sides of the support body. The upper part of the pruning blade can move synchronously with the moving small wheel along the arc-shaped support. The middle part of the pruning blade is hinged to the support body, and the rotation axis of the pruning blade is coaxially distributed with the revolution axis of the moving small wheel. An arc-shaped blade is provided on the lower left side of the pruning blade, and an arc-shaped branch-locking part opposite to the arc-shaped blade is fixedly provided on the left side of the support body.

7. The pruning power head for high-branch pruning shears according to claim 6, characterized in that, The rotation axis of the pruning knife is located inside the circle containing the arc-shaped support surface of the arc-shaped branch clamp.

8. The pruning power head for high-branch pruning shears according to claim 6, characterized in that, The large movable wheel, the small movable wheel, and the upper part of the pruning blade are coaxially hinged to a first hinge bolt.

9. The pruning power head for high-branch pruning shears according to claim 8, characterized in that, The middle part of the pruning blade is hinged to the support body by a second hinge bolt.

10. The pruning power head for high-branch pruning shears according to claim 9, characterized in that, A torsion spring is fitted onto the second hinge bolt, and the torsion spring is used to drive the pruning blade to rotate and swing back to the initial pruning position.

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