Portable felling device

Abstract

The invention discloses a portable felling device which comprises a base, a driving device, a rocker arm and a saw blade. One end of the rocker arm is a rotating end, the rocker arm is movably connected with the base through a second shaft, and the rocker arm can swing back and forth around the axis of the second shaft in the plane direction perpendicular to the axis; the other end of the rocker arm is a swing end and is movably connected with a driving device, and the driving device is mounted on the base and can drive the swing end to swing back and forth; saw teeth are arranged at the front end of the saw blade, and the rear end of the saw blade is installed at the rotating end of the rocker arm. When the driving device drives the swinging end of the rocker arm to swing back and forth, the rotating end of the rocker arm rotates back and forth so as to drive the front end of the saw blade to swing back and forth. Tree or bamboo is cut by driving the saw blade to swing back and forth, the cutting efficiency can be remarkably improved, the labor intensity is reduced, and the operation convenience and safety are enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of felling tools, in particular to a portable felling device. Background Art

[0002] In the existing tree or bamboo felling process, manual felling or large mechanical equipment is usually used. Manual felling is labor-intensive, inefficient, and prone to personal injury. Although large-scale automated felling equipment improves work efficiency, it is bulky and inconvenient to operate. It needs to be mounted on a large vehicle and is difficult to use in small spaces and complex terrains, especially in areas with dense bamboo forests. In addition, it is expensive to use and is not economical for small-scale bamboo felling. Therefore, there is a demand in the market for portable and efficient bamboo felling tools.

[0003] Currently available portable felling tools usually use chainsaws with linear motion or circular saws with circular motion, which require the use of very long saw blades or large circular saw blades. At the same time, they need to be equipped with transmission or guiding mechanisms such as active wheels, passive wheels, tensioning wheels, and guide rails that are necessary for chain saws and circular saws. Therefore, there are problems such as low power transmission efficiency, slow blade movement speed, and large size.

[0004] In view of this, this application is hereby filed. Summary of the invention

[0005] The technical problem to be solved by the present invention is that the existing portable felling tools use chain saws or circular saws, which need to be equipped with necessary transmission or guiding mechanisms. Therefore, there are problems such as low power transmission efficiency, slow blade movement speed, and large size. The purpose is to provide a portable felling device that can cut trees or bamboos by driving the saw blade to swing back and forth, which can significantly improve the felling efficiency, reduce labor intensity, and enhance operational convenience and safety.

[0006] The present invention is achieved through the following technical solutions:

[0007] A portable felling device comprises a base, a driving device, a rocker arm and a saw blade;

[0008] One end of the rocker arm is a rotating end, which is movably connected to the base through the second axis, and the rocker arm can swing back and forth around the axis of the second axis in a plane direction perpendicular to the axis;

[0009] The other end of the rocker arm is a swing end, which is movably connected to a driving device, and the driving device is installed on the base and can drive the swing end to swing back and forth;

[0010] The front end of the saw blade is provided with saw teeth, and the rear end is mounted on the rotating end of the rocker arm;

[0011] When the driving device drives the swing end of the rocker arm to swing back and forth, the rotating end of the rocker arm rotates back and forth, thereby driving the front end of the saw blade to swing back and forth.

[0012] The present invention realizes the cutting of trees or bamboos by driving the saw blade to swing back and forth, which can significantly improve the felling efficiency, reduce labor intensity, and enhance the convenience and safety of operation.

[0013] In a specific embodiment, the driving device includes a first shaft, which can rotate around its own axis relative to the base, and an eccentric shaft is installed on the first shaft. The axis of the eccentric shaft is staggered with the axis of the first shaft, and the upper end of the eccentric shaft is movably connected to the swing end of the rocker arm; the rotation of the first shaft can drive the eccentric shaft to make a circular motion, thereby driving the swing end of the rocker arm to swing back and forth.

[0014] In a specific embodiment, a slot is provided at the swing end of the rocker arm, the eccentric shaft is arranged in the slot and abuts against the side wall of the slot, the longitudinal dimension of the slot coinciding with the radial direction of the second axis is larger than the dimension of the eccentric shaft, the transverse dimension of the slot perpendicular to the longitudinal direction matches the dimension of the eccentric shaft, and when the first axis drives the eccentric shaft to make a circular motion, the upper end of the eccentric shaft can move back and forth along the longitudinal direction of the slot.

[0015] The present invention combines a first shaft, a second shaft, an eccentric shaft and a rocker arm into a mechanism similar to a swing guide rod mechanism. When a rotational motion is input from the first shaft, the eccentric shaft will rotate around the axis of the first shaft to make a circular motion under the drive of the first shaft, so that the eccentric shaft will undergo periodic changes in both the longitudinal and transverse directions of the slot. Since the eccentric shaft is clamped in the slot of the rocker arm, and the size of the slot in the transverse direction matches the corresponding size of the eccentric shaft, and the size of the slot in the longitudinal direction is larger than the corresponding size of the eccentric shaft, the movement of the eccentric shaft in the transverse direction can be transmitted to the rocker arm, and the movement of the eccentric shaft in the longitudinal direction will be offset by the relative displacement of the eccentric shaft and the slot, so that the movement of the rocker arm is manifested as a periodic reciprocating swing around the second shaft, thereby driving the saw blade to also periodically reciprocate around the second shaft, and the saw blade contacts the bamboo with a high-speed reciprocating swing to quickly cut the bamboo body.

[0016] The present invention achieves the cutting of trees or bamboos by the reciprocating swinging action of the saw blade. Compared with the existing method of using a chain saw with linear motion or a circular saw with circular motion, the present invention does not need to use a very long saw blade or a circular saw blade with a large area, and does not need to set up a driving wheel, a passive wheel, a tensioning wheel, a guide rail and other transmission or guiding mechanisms required for chain saws and circular saws. It is conducive to the miniaturization and lightweight of the felling tool, which can be easily carried by humans without being carried by a large carrier, and can therefore be used in environments with narrow spaces and complex terrains, with lower use costs.

[0017] In a specific embodiment, a rolling body is sleeved on the outer wall of the eccentric shaft, and the rolling body abuts against the side wall of the slot. By providing the rolling body, a rolling connection is formed between the side wall of the slot and the outer wall of the first shaft, thereby reducing friction.

[0018] In a specific embodiment, a wear-resistant pad layer is provided on the side wall of the slot abutting against the eccentric shaft.

[0019] In a specific embodiment, an eccentric wheel is connected to the first shaft, the eccentric shaft is connected to the eccentric wheel, and the center of mass of the eccentric wheel and the center of mass of the eccentric shaft are respectively located on both sides of the first shaft to improve the overall stability of the driving structure.

[0020] In a specific embodiment, a handle is connected to a side of the base away from the saw blade for easy handholding.

[0021] In a specific embodiment, limit stops are provided on both sides of the saw blade, the front ends of the two limit stops extend beyond the front end of the saw blade, and the limit stops are provided with space for the saw blade to swing at the same height as the saw blade.

[0022] In a specific embodiment, an energy storage module is connected to the handle, and the energy storage module is used to provide energy to the driving device.

[0023] In a specific embodiment, a gripping portion is provided on the handle.

[0024] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0025] 1. A portable felling device provided in an embodiment of the present invention can cut trees or bamboos by driving a saw blade to swing back and forth, which can significantly improve felling efficiency, reduce labor intensity, and enhance operational convenience and safety;

[0026] 2. A portable felling device provided in an embodiment of the present invention, which is composed of a first shaft, a second shaft, an eccentric wheel, an eccentric shaft and a rocker arm to form a mechanism similar to a swing guide rod mechanism, can convert the rotational motion of the first shaft into the reciprocating swing of a saw blade, and is used for cutting trees or bamboos. The overall structure is simple, the size is small, and it is easy to carry and operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 A schematic diagram of the three-dimensional structure of a felling tool provided by an embodiment of the present invention;

[0029] Figure 2 Schematic diagram of the partial three-dimensional structure of the felling tool provided by the embodiment of the present invention Figure 1 ;

[0030] Figure 3 Schematic diagram of the partial three-dimensional structure of the felling tool provided by the embodiment of the present invention Figure 2 ;

[0031] Figure 4 The embodiment of the present invention provides Figure 3 Schematic diagram of the local structure at position Ⅰ;

[0032] Figure 5 A schematic diagram of a partial side view of a felling tool provided in an embodiment of the present invention;

[0033] Figure 6 A schematic diagram of a partial side cross-sectional structure of a felling tool provided in an embodiment of the present invention;

[0034] Figure 7 A schematic diagram of a partial top view of the felling tool provided by an embodiment of the present invention;

[0035] Figure 8 A schematic diagram of the structure of a felling tool driving device provided in an embodiment of the present invention;

[0036] Fig. 9 A schematic diagram of the structure of an eccentric wheel of a felling tool provided by an embodiment of the present invention;

[0037] Fig.10 A schematic diagram of the rocker arm structure of a felling tool provided in an embodiment of the present invention.

[0038] Marks and corresponding parts names in the attached drawings:

[0039] 1-base; 2-first axis; 3-second axis; 4-eccentric axis; 5-rocker arm; 6-saw blade; 7-driving device; 8-handle; 9-energy storage module; 11-limit stop; 12-connecting seat; 21-eccentric wheel; 211-protrusion; 41-rolling body; 51-wear-resistant pad layer; 81-grip portion. DETAILED DESCRIPTION

[0040] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0041] In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present invention. However, it is apparent to those of ordinary skill in the art that these specific details do not have to be employed to practice the present invention. In other embodiments, in order to avoid confusing the present invention, well-known structures are not specifically described.

[0042] Throughout the specification, references to "one embodiment," "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment of the present invention. Therefore, the phrases "one embodiment," "an embodiment," "an example," or "an example" appearing in various places throughout the specification do not necessarily all refer to the same embodiment or example. In addition, particular features, structures, or characteristics may be combined in one or more embodiments or examples in any suitable combination and / or sub-combination. In addition, it will be appreciated by those of ordinary skill in the art that the figures provided herein are for illustrative purposes and that the figures are not necessarily drawn to scale. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0043] In the description of the present invention, the directions or positional relationships indicated by terms such as “front”, “rear”, “left”, “right”, “up”, “down”, “vertical”, “horizontal”, “high”, “low”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the scope of protection of the present invention.

[0044] Example 1

[0045] like Figure 1-Figure 10 As shown, a portable felling device provided by an embodiment of the present invention includes a base 1, a driving device 7, a rocker arm 5 and a saw blade 6;

[0046] One end of the rocker arm 5 is a rotating end, which is movably connected to the base 1 through the second shaft 3, and the rocker arm 5 can swing back and forth around the axis of the second shaft 3 in a plane direction perpendicular to the axis;

[0047] The other end of the rocker arm 5 is a swing end, which is movably connected to a driving device 7. The driving device 7 is installed on the base 1 and can drive the swing end to swing back and forth;

[0048] The front end of the saw blade 6 is provided with saw teeth, and the rear end is mounted on the rotating end of the rocker arm 5;

[0049] When the driving device 7 drives the swing end of the rocker arm 5 to swing back and forth, the rotating end of the rocker arm 5 rotates back and forth, thereby driving the front end of the saw blade 6 to swing back and forth.

[0050] The present invention realizes the cutting of trees or bamboos by driving the saw blade to swing back and forth, which can significantly improve the felling efficiency, reduce labor intensity, and enhance the convenience and safety of operation.

[0051] In a specific embodiment, the driving device 7 includes a first shaft 2, which can rotate around its own axis relative to the base 1, and an eccentric shaft 4 is installed on the first shaft 2. The axis of the eccentric shaft 4 is staggered with the axis of the first shaft 2, and the upper end of the eccentric shaft 4 is movably connected to the swing end of the rocker arm 5; the rotation of the first shaft 2 can drive the eccentric shaft 4 to make a circular motion, thereby driving the swing end of the rocker arm 5 to swing back and forth.

[0052] In a specific embodiment, a slot is provided at the swinging end of the rocker arm 5, and the eccentric shaft 4 is arranged in the slot and abuts against the side wall of the slot. The longitudinal dimension of the slot coinciding with the radial direction of the second shaft 3 is larger than the dimension of the eccentric shaft 4, and the transverse dimension of the slot perpendicular to the longitudinal direction matches the dimension of the eccentric shaft 4. When the first shaft 2 drives the eccentric shaft 4 to make a circular motion, the upper end of the eccentric shaft 4 can move back and forth along the longitudinal direction of the slot.

[0053] The present invention combines a first shaft, a second shaft, an eccentric shaft and a rocker arm into a mechanism similar to a swing guide rod mechanism. When a rotational motion is input from the first shaft, the eccentric shaft will rotate around the axis of the first shaft to make a circular motion under the drive of the first shaft, so that the eccentric shaft will undergo periodic changes in both the longitudinal and transverse directions of the slot. Since the eccentric shaft is clamped in the slot of the rocker arm, and the size of the slot in the transverse direction matches the corresponding size of the eccentric shaft, and the size of the slot in the longitudinal direction is larger than the corresponding size of the eccentric shaft, the movement of the eccentric shaft in the transverse direction can be transmitted to the rocker arm, and the movement of the eccentric shaft in the longitudinal direction will be offset by the relative displacement of the eccentric shaft and the slot, so that the movement of the rocker arm is manifested as a periodic reciprocating swing around the second shaft, thereby driving the saw blade to also periodically reciprocate around the second shaft, and the saw blade contacts the bamboo with a high-speed reciprocating swing to quickly cut the bamboo body.

[0054] The present invention achieves the cutting of trees or bamboos by the reciprocating swinging action of the saw blade. Compared with the existing method of using a chain saw with linear motion or a circular saw with circular motion, the present invention does not need to use a very long saw blade or a circular saw blade with a large area, and does not need to set up a driving wheel, a passive wheel, a tensioning wheel, a guide rail and other transmission or guiding mechanisms required for chain saws and circular saws. It is conducive to the miniaturization and lightweight of the felling tool, which can be easily carried by humans without being carried by a large carrier, and can therefore be used in environments with narrow spaces and complex terrains, with lower use costs.

[0055] In a specific embodiment, the specific structural form of the base 1 is not limited to a plate-like structure, a frame-like structure, a box-like structure, etc., as long as it can be used to carry components such as the drive device 7, the eccentric shaft 4, the rocker arm 5, etc.; for example Figures 1 to 3 As shown, the base 1 adopts a hollow box-shaped structure, which is roughly hexahedral. The drive device 7, the eccentric shaft 4, and the second shaft 3 are all located inside the base 1, which can play a certain protective role. Figure 3 The top plate and a side plate of the base 1 are removed to show the internal components such as the drive device 7, the eccentric shaft 4, and the rocker arm 5.

[0056] In a specific embodiment, the driving device 7 includes but is not limited to a power device such as a motor, an internal combustion engine, a rotary cylinder, a rotary oil cylinder, etc., which can output a rotational motion to the first shaft 2 .

[0057] In a specific embodiment, the specific distance that the eccentric shaft 4 deviates to one side along the radial direction of the first shaft 2 is determined according to actual needs. The offset distance can be greater than or equal to the sum of the radii of the first shaft 2 and the eccentric shaft 4, so that the eccentric shaft 4 is completely located outside the first shaft 2. The offset distance can also be less than the sum of the radii of the first shaft 2 and the eccentric shaft 4, so that the eccentric shaft 4 and the first shaft 2 still partially overlap.

[0058] In a specific embodiment, the second axis 3 can be fixed on the rocker arm 5 or on the base 1, or it can be independent of the rocker arm 5 and the base 1 and installed in a detachable manner; the swingable angle of the second axis 3 depends on actual needs, and can be less than 360° or greater than or equal to 360°.

[0059] In a specific embodiment, the arrangement of the teeth on the saw blade 6 includes but is not limited to a straight line arrangement and an arc line arrangement. Figure 7 As shown, the teeth on the saw blade 6 are arranged in a straight line. When the saw blade 6 swings and cuts trees or bamboos, the teeth at different positions have different angles when cutting the trees or bamboos. Compared with a circular saw with a constant relative angle, a better cutting effect can be obtained, which is particularly suitable for cutting bamboos.

[0060] In a specific embodiment, the saw blade 6 is made of a high-hardness alloy material, such as a high-hardness tungsten carbide alloy component with a hardness of HRC55 to HRC65.

[0061] In a specific embodiment, the saw blade 6 is detachably connected to the rocker arm 5, so that the staff can quickly replace the new saw blade 6 when the saw blade 6 is damaged or the cutting requirements change. The specific forms of the detachable connection include but are not limited to threaded connection, snap connection, and mortise and tenon connection.

[0062] In a specific embodiment, a rolling body 41 is sleeved on the outer wall of the eccentric shaft 4, and the rolling body 41 abuts against the side wall of the slot. By setting the rolling body, a rolling connection is formed between the side wall of the slot and the outer wall of the first shaft, thereby reducing friction. The specific structural form of the rolling body 41 includes but is not limited to rollers, bearings, and balls. For example Figure 6 to Figure 7 As shown, a roller is rotatably connected to the eccentric shaft 4, and the diameter of the roller matches the width of the slot in the transverse direction, so that the roller can maintain contact with the side wall of the slot.

[0063] In a specific embodiment, a wear-resistant pad layer 51 is provided on the side wall of the slot abutting against the eccentric shaft 4 .

[0064] The wear-resistant pad layer 51 includes but is not limited to: an independent component connected to the side wall of the slot, such as a polyurethane plate or a POM polyoxymethylene plate; a coating applied to the side wall of the slot, such as a ceramic coating or a tungsten carbide coating; and a special surface treatment of the side wall of the slot, such as surface carburization. Preferably, the wear-resistant pad layer 51 is made of Cr12MoV alloy steel and is subjected to quenching heat treatment to improve its wear resistance; and grease is applied between the wear-resistant pad layer 51 and the side wall of the slot.

[0065] In a specific embodiment, the wear-resistant pad layer 51 is detachably connected to the side wall of the slot. The specific forms of detachable connection include but are not limited to threaded connection, buckle connection, mortise and tenon connection; for example Fig.10 As shown, each wear-resistant pad layer 51 is detachably connected to the side wall of the slot via two threaded connectors.

[0066] In a specific embodiment, an eccentric wheel 21 is connected to the first shaft 2, and the eccentric shaft 4 is connected to the eccentric wheel 21. The center of mass of the eccentric wheel 21 and the center of mass of the eccentric shaft 4 are respectively located on both sides of the first shaft 2 to improve the overall stability of the driving structure.

[0067] The eccentric wheel 21 and the eccentric shaft 4 can be two relatively independent components or two parts of an integrated component; the method of adjusting the center of mass position of the eccentric wheel 21 includes but is not limited to: setting the eccentric wheel 21 to a non-centrally symmetrical structure, for example Fig. 9 As shown, a protrusion 211 is provided on one side of the eccentric wheel 21, so that the center of mass of the eccentric wheel 21 deviates in a direction away from the eccentric shaft 4; different density materials are used at different positions of the eccentric wheel 21; a counterweight is connected to one side of the eccentric wheel 21 or a material reduction process is performed, for example Fig. 9 As shown, the openings of the connecting piece used to connect the eccentric wheel 21 to the first shaft 2 are concentrated on the side of the eccentric wheel 21 away from the eccentric shaft 4. After the connecting piece is installed, the connecting piece will be concentrated on the side of the eccentric wheel 21 away from the eccentric shaft 4, so that the center of mass of the eccentric wheel 21 deviates in the direction away from the eccentric shaft 4.

[0068] In a specific embodiment, limit stops 11 are provided on both sides of the saw blade 6, and the front ends of the two limit stops 11 extend beyond the front end of the saw blade 6. The spacing between the limit stops 11 is greater than the diameter of the tree or bamboo to be cut. When in use, the tree or bamboo can be stuck between the front ends of the two limit stops, and then the saw blade is cut to prevent the saw blade from slipping and directly leaving the tree or bamboo, thereby improving the stability during cutting. The specific structure of the limit stop 11 includes but is not limited to a plate structure, a rod structure, and a block structure.

[0069] In a specific embodiment, the limit stopper 11 has a space for the saw blade 6 to swing at the same height as the saw blade 6, for example Figure 5 As shown, the top surface height of the limit stop portion is lower than the bottom surface height of the saw blade 6 , which can prevent the limit stop 11 from colliding with the saw blade 6 .

[0070] In a specific embodiment, a connection seat 12 is connected to the side of the base 1 away from the saw blade 6, and a handle 8 is inserted into the connection seat 12 for easy handholding. The handle 8 can be a shaft-shaped member, and the cross-section of the handle 8 is elliptical, so that the operator can judge the direction of the current saw blade 6 by hand feel.

[0071] In a specific embodiment, the handle 8 is a hollow structure to reduce the weight of the handle 8 .

[0072] In a specific embodiment, at least two gripping portions 81 are provided on the handle 8, and the gripping portions 81 are spaced apart along the length direction of the handle 8. The gripping portions 81 may be further provided with anti-slip patterns or added with anti-slip materials, such as rubber material.

[0073] In a specific embodiment, the handle 8 is connected to an energy storage module 9, and the energy storage module 9 is used to provide energy to the driving device 7. The specific type of the energy storage module 9 matches the driving device 7. For example, if the driving device 7 is a motor, the energy storage module 9 uses a battery; if the driving device 7 is an internal combustion engine, the energy storage module 9 is an oil tank; if the driving device 7 is a rotary cylinder, the energy storage module 9 is a gas tank.

[0074] In a specific embodiment, a controller is connected to the handle 8, and the controller is in communication connection with the drive device 7 to control the start and stop of the drive device 7, so that the operator can more safely remotely control the cutting state of the saw blade 6. Specific forms of communication connection include but are not limited to wired connection and wireless connection.

[0075] In a specific embodiment, the controller is also used to control the rotational speed of the driving device 7; specifically, the controller can include a control device such as a knob, a roller, and a pull rod, whose output signal can change with the input. Then, the rotational speed of the driving device 7 can be adjusted by rotating the knob, rolling the roller to adjust the rotational speed of the driving device 7, and pushing and pulling the pull rod to adjust the rotational speed of the driving device 7.

[0076] The controller described in this application adopts an existing commonly used controller and does not involve any improvement to the controller program of this application.

[0077] In an optional embodiment, the energy storage module 9 is detachably connected to the handle 8. Specific methods of detachable connection include but are not limited to: using a threaded connector to connect the energy storage module 9 to the handle 8; providing a socket on the energy storage module 9 and passing the handle 8 through the socket to achieve plug-in connection; using existing products, such as a clamp or a cable tie, to connect the energy storage module 9 to the handle 8.

[0078] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A portable felling device, characterized in that: It comprises a base (1), a driving device (7), a rocker arm (5) and a saw blade (6); One end of the rocker arm (5) is a rotating end, which is movably connected to the base (1) via the second shaft (3), and the rocker arm (5) can swing back and forth around the axis of the second shaft (3) in a plane direction perpendicular to the axis; The other end of the rocker arm (5) is a swing end, which is movably connected to a driving device (7). The driving device (7) is mounted on the base (1) and can drive the swing end to swing back and forth. The front end of the saw blade (6) is provided with saw teeth, and the rear end is mounted on the rotating end of the rocker arm (5); When the driving device (7) drives the swing end of the rocker arm (5) to swing back and forth, the rotating end of the rocker arm (5) rotates back and forth, thereby driving the front end of the saw blade (6) to swing back and forth.

2. A portable felling device according to claim 1, characterized in that: The driving device (7) comprises a first shaft (2), the first shaft (2) being capable of rotating about its own axis relative to the base (1), an eccentric shaft (4) being mounted on the first shaft (2), the axis of the eccentric shaft (4) being staggered from the axis of the first shaft (2), and the upper end of the eccentric shaft (4) being movably connected to the swing end of the rocker arm (5); the rotation of the first shaft (2) can drive the eccentric shaft (4) to perform circular motion, thereby driving the swing end of the rocker arm (5) to swing back and forth.

3. A portable felling device according to claim 2, characterized in that: A slot is provided at the swing end of the rocker arm (5), the eccentric shaft (4) is arranged in the slot and abuts against the side wall of the slot, the longitudinal dimension of the slot coinciding with the radial direction of the second shaft (3) is larger than the dimension of the eccentric shaft (4), the transverse dimension of the slot perpendicular to the longitudinal direction matches the dimension of the eccentric shaft (4), and when the first shaft (2) drives the eccentric shaft (4) to make a circular motion, the upper end of the eccentric shaft (4) can move back and forth along the longitudinal direction of the slot.

4. A portable felling device according to claim 3, characterized in that: A rolling body (41) is sleeved on the outer wall of the eccentric shaft (4), and the rolling body (41) abuts against the side wall of the slot.

5. A portable felling device according to claim 3, characterized in that: A wear-resistant cushion layer (51) is provided on the side wall of the slot abutting against the eccentric shaft (4).

6. A portable felling device according to claim 2, characterized in that: An eccentric wheel (21) is connected to the first shaft (2), the eccentric shaft (4) is connected to the eccentric wheel (21), and the center of mass of the eccentric wheel (21) and the center of mass of the eccentric shaft (4) are respectively located on two sides of the first shaft (2).

7. A portable felling device according to claim 1, characterized in that: A handle (8) is connected to a side of the base (1) away from the saw blade (6).

8. A portable felling device according to claim 7, characterized in that: Limit stops (11) are arranged on both sides of the saw blade (6), the front ends of the two limit stops (11) extend beyond the front end of the saw blade (6), and a space for the saw blade (6) to swing is provided at a position flush with the height of the saw blade (6) on the limit stops (11).

9. A portable felling device according to claim 7, characterized in that: The handle (8) is connected to an energy storage module (9), and the energy storage module (9) is used to provide energy to the driving device (7).

10. A portable felling device according to claim 9, characterized in that: The handle (8) is provided with a gripping portion (81).

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