Portable felling device

Abstract

The utility model 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. According to the utility model, trees or bamboos are cut by driving the saw blade to swing back and forth, so that the felling efficiency can be obviously improved, the labor intensity is reduced, and the operation convenience and safety are enhanced.

Description

TECHNICAL FIELD

[0001] The utility model relates to felling tool technical field, specifically, relates to a portable felling device. BACKGROUND

[0002] In the prior art, manual felling or large-scale mechanical equipment is usually used in the process of felling trees or bamboos. Manual felling has high labor intensity, low efficiency, and is prone to cause personal injury. Although large-scale automatic felling equipment improves work efficiency, it is bulky, inconvenient to operate, needs to be carried on a large carrier, and is difficult to be applied to narrow space and complex terrain, especially cannot be flexibly used in dense bamboo forest area, and has high use cost, which is poor in economy for small-scale bamboo felling. Therefore, there is a demand for portable and efficient bamboo felling tools in the market.

[0003] At present, the existing portable felling tools usually adopt linear motion chain saws or use circular saws in circular motion, and need to use very long saw blades or very large circular saw blades, and need to be equipped with driving wheels, driven wheels, tensioning wheels, guide sliding rails and other transmission or guide mechanisms necessary for chain saws and circular saws, so that there are problems of low power transmission efficiency, slow blade movement speed and large size.

[0004] Therefore, the present application is proposed. UTILITY MODEL CONTENTS

[0005] The utility model solves the technical problem that the existing portable felling tools adopt chain saws or circular saws, need to be equipped with necessary transmission or guide mechanisms, and thus have problems of low power transmission efficiency, slow blade movement speed and large size, and aims to provide a portable felling device, which realizes cutting of trees or bamboos through reciprocating swinging action of a driven saw blade, can significantly improve felling efficiency, reduce labor intensity, and enhance operation convenience and safety.

[0006] The utility model realizes the following technical scheme:

[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 a second shaft, and the rocker arm can swing back and forth in the plane direction of the vertical axis around the axis of the second shaft.

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

[0010] The front end of the saw blade is provided with a sawtooth, and the rear end is installed on the rotating end of the rocker arm.

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

[0012] The utility model discloses a cutting of tree or bamboo is realized to the reciprocating swing action of driving saw blade, can improve the felling efficiency significantly, reduce the labor intensity, strengthen the operation convenience and security.

[0013] In a specific embodiment, the driving device comprises a first shaft capable of rotating about its own axis relative to the base, an eccentric shaft mounted on the first shaft, the axis of the eccentric shaft being offset from the axis of the first shaft, and the swing end of the swing arm being movably connected to the upper end of the eccentric shaft.

[0014] In a specific embodiment, the swing end of the swing arm is provided with a clamping groove, the eccentric shaft is arranged in the clamping groove and abuts against the side wall of the clamping groove, the longitudinal direction dimension of the clamping groove coinciding with the radial direction of the second shaft is greater than the dimension of the eccentric shaft, and the transverse direction dimension of the clamping groove perpendicular to the longitudinal direction matches the dimension of the eccentric shaft.

[0015] The utility model discloses a mechanism similar to a swing guide rod mechanism is formed by the first shaft, the second shaft, the eccentric shaft and the swing arm, when the rotating action is input from the first shaft, the eccentric shaft will rotate about the axis of the first shaft and do the circular motion under the driving of the first shaft, thereby making the eccentric shaft periodically change along the longitudinal direction and the transverse direction of the clamping groove.

[0016] The utility model discloses a cutting of tree or bamboo is realized to the reciprocating swing action of driving saw blade, compared with the existing mode of using linear motion chain saw or circular motion circular saw, the utility model on one hand does not need to use the saw blade of very long length or the circular saw blade of very large area, on the other hand also does not need to set up the transmission or guiding mechanism, such as driving wheel, driven wheel, tensioning wheel, guiding slide, which is indispensable for chain saw and circular saw, is favorable to realize the miniaturization and light weight of felling tool, can be convenient for manual carrying, need not be carried by large -size carrier, thereby can carry out the operation in the environment of narrow space, complex terrain, and the use cost is lower.

[0017] In a specific embodiment, a rolling body is sleeved on the eccentric shaft outer wall, and the rolling body abuts against the side wall of the clamping groove.

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

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

[0020] In a specific embodiment, a handle is connected to the side of the base away from the saw blade, so as to facilitate hand holding.

[0021] In a specific embodiment, limit stops are arranged on two sides of the saw blade, and the front ends of the two limit stops extend beyond the front end of the saw blade; the limit stops have spaces for the saw blade to swing at the positions where the limit stops are flush with 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 for the driving device.

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

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

[0025] 1. The portable felling device provided by the embodiment of the utility model realizes cutting of trees or bamboos through the reciprocating swinging action of the driving saw blade, can significantly improve the felling efficiency, reduce the labor intensity, and enhance the operation convenience and safety.

[0026] 2. The portable felling device provided by the embodiment of the utility model 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 swinging guide rod mechanism, can convert the rotary motion of the first shaft into the reciprocating swinging of the saw blade, and is used for cutting of trees or bamboos; the overall structure is simple and small in size, and is convenient to carry and operate. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical scheme of the exemplary embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiments, and it should be understood that the following drawings only show some embodiments of the utility model, and therefore should not be regarded as a limitation on the scope; for ordinary skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0028] Figure 1 The utility model provides a felling tool three -dimensional structure schematic diagram provided for the embodiment of the utility model,

[0029] Figure 2 The utility model provides a felling tool local three -dimensional structure schematic diagram provided for the embodiment of the utility model, Figure One ;

[0030] Figure 3 The utility model provides a felling tool local three -dimensional structure schematic diagram provided for the embodiment of the utility model, Figure Two ;

[0031] Figure 4 The utility model provides a felling tool local three -dimensional structure schematic diagram provided for the embodiment of the utility model,

[0032] Figure 5 The utility model provides a felling tool local three -dimensional structure schematic diagram provided for the embodiment of the utility model,

[0033] Figure 6 The utility model provides a felling tool local three -dimensional structure schematic diagram provided for the embodiment of the utility model,

[0034] Figure 7 The utility model provides a felling tool local three -dimensional structure schematic diagram provided for the embodiment of the utility model,

[0035] Figure 8 The utility model provides a felling tool local three -dimensional structure schematic diagram provided for the embodiment of the utility model,

[0036] Figure 9 The utility model provides a felling tool local three -dimensional structure schematic diagram provided for the embodiment of the utility model,

[0037] Figure 10 The utility model provides a felling tool local three -dimensional structure schematic diagram provided for the embodiment of the utility model,

[0038] Mark and corresponding component name in the drawing:

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

[0040] In order to make the purpose, technical scheme and advantage of the utility model more clearly, the utility model is further explained in detail below by combining with the embodiment and the drawing, and the illustrative embodiment and the explanation of the utility model are only used to explain the utility model, and do not serve as the limitation of the utility model.

[0041] In the following description, numerous specific details are set forth to provide a thorough understanding of the present application. However, it will be apparent to one skilled in the art that the present application can be practiced without the specific details. In other instances, well-known structures have not been described in order to avoid obscuring the present application.

[0042] Reference throughout this specification to "one embodiment", "an embodiment", "one example", or "an example" means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in at least one embodiment of the application. Thus, the appearances of the phrases "in one embodiment", "in an embodiment", "in one example", or "in an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics can be combined in any suitable

[0043] In the description of the present application, the terms "front", "back", "left", "right", "top", "bottom", "vertical", "horizontal", "high", "low", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the scope of protection of the present application.

[0044] Embodiment 1

[0045] As shown in Figures 1-10 The portable felling device provided by the embodiment of the present application comprises 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 with the base 1 through a second shaft 3, and the rocker arm 5 can swing back and forth in the plane direction of the vertical axis around the axis of the second shaft 3.

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

[0048] The front end of the saw blade 6 is provided with a sawtooth, and the rear end is installed on the rotating end of the rocker arm 5.

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

[0050] The utility model discloses a driving saw blade reciprocating swing action realizes the cutting of tree or bamboo, can improve the felling efficiency, reduce the labor intensity, enhance the operation convenience and security.

[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, 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 with the swing end of the swing arm 5; the rotation of the first shaft 2 can drive the eccentric shaft 4 to move in a circle, thereby driving the swing end of the swing arm 5 to swing back and forth.

[0052] In a specific embodiment, the swing end of the swing arm 5 is provided with a clamping groove, the eccentric shaft 4 is arranged in the clamping groove and abuts against the side wall of the clamping groove, the longitudinal direction size of the clamping groove coinciding with the radial direction of the second shaft 3 is greater than the size of the eccentric shaft 4, the transverse direction size of the clamping groove perpendicular to the longitudinal direction is matched with the size of the eccentric shaft 4, and when the first shaft 2 drives the eccentric shaft 4 to move in a circle, the upper end of the eccentric shaft 4 can move back and forth along the longitudinal direction of the clamping groove.

[0053] The utility model discloses a first shaft, second shaft, eccentric shaft and swing arm combination into the mechanism similar to swing guide rod mechanism, when from the first shaft input rotation action, eccentric shaft will be driven under the first shaft and rotate and move in a circle around the axis of the first shaft, thereby making eccentric shaft along the longitudinal direction and the transverse direction of the clamping groove all have periodic change;And because the eccentric shaft is clamped in the clamping groove of the swing arm, and the size of the clamping groove along the transverse direction is matched with the corresponding size of the eccentric shaft, and the size of the clamping groove along the longitudinal direction is greater than the corresponding size of the eccentric shaft, therefore the movement of the eccentric shaft along the transverse direction can be transmitted to the swing arm, and the movement of the eccentric shaft along the longitudinal direction is offset by the relative displacement of the eccentric shaft and the clamping groove, thereby making the movement of the swing arm show periodic reciprocating swing around the second shaft, and further driving the saw blade to also move in a circle and reciprocate around the second shaft, and the saw blade contacts the bamboo at high speed and cuts the bamboo body quickly.

[0054] The utility model discloses a saw blade is by the reciprocating swing action of saw blade and realizes the cutting of tree or bamboo, compared with the chain saw of linear motion or the existing mode of circular saw of circular motion, the utility model on one hand does not need to use the very long saw blade or the very large circular saw blade, on the other hand also does not need to set up the transmission or guiding mechanism of chain saw and circular saw indispensable driven wheel, passive wheel, tension pulley, guide slide, is favorable to realize the miniaturization and light weight of felling tool, can facilitate manual carrying, need not be carried by large -scale carrier, further can carry out the operation in the environment of narrow space, complex terrain, and the use cost is lower.

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

[0056] In a specific embodiment, the driving device 7 includes but is not limited to motor, internal combustion engine, rotary cylinder, rotary oil cylinder and other power devices that can output rotary action to the first shaft 2.

[0057] In a specific embodiment, the specific distance of the eccentric shaft 4 deviating to one side along the radial direction of the first shaft 2 is determined according to actual needs, which 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, or the offset distance can be less than the sum of the radii of the first shaft 2 and the eccentric shaft 4, so that the eccentric shaft 4 still partially overlaps the first shaft 2.

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

[0059] In a specific embodiment, the arrangement of the saw teeth on the saw blade 6 includes but is not limited to linear arrangement and arcuate arrangement. For example Figure 7 As shown, the saw teeth on the saw blade 6 are arranged in a linear manner, so that when the saw blade 6 swings and cuts the tree or bamboo, the saw teeth at different positions have different angles when cutting the tree or bamboo, which can obtain better cutting effect compared with the circular saw with constant relative angle, especially suitable for cutting bamboo.

[0060] In some embodiments, the saw blade 6 is made of high hardness alloy material, such as high hardness tungsten carbide alloy material, with a hardness of HRC 55 to HRC 65.

[0061] In some embodiments, 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 demand changes. The specific form of detachable connection includes but is not limited to threaded connection, buckle connection, mortise and tenon connection.

[0062] In some embodiments, 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 clamping groove. By arranging the rolling body, a rolling connection is formed between the side wall of the clamping groove and the outer wall of the first shaft, thereby reducing the friction. The specific structure of the rolling body 41 includes but is not limited to a roller, a bearing, and a ball. For example Figures 6 to 7 As shown, the roller is rotatably connected to the eccentric shaft 4, and the diameter of the roller matches the width of the clamping groove in the transverse direction, so that the roller can abut against the side wall of the clamping groove.

[0063] In some embodiments, a wear-resistant pad layer 51 is arranged on the side wall of the clamping groove 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 clamping groove, such as a polyurethane plate and a POM polyoxymethylene plate; a coating arranged on the side wall of the clamping groove, such as a ceramic coating and a tungsten carbide coating; and a special surface treatment of the side wall of the clamping groove, such as surface carburizing. 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 clamping groove.

[0065] In some embodiments, the wear-resistant pad layer 51 is detachably connected to the side wall of the clamping groove. The specific form of detachable connection includes but is not limited to threaded connection, buckle connection, and mortise and tenon connection. For example Figure 10 As shown, each wear-resistant pad layer 51 is detachably connected to the side wall of the clamping groove through two threaded connections.

[0066] In some embodiments, the first shaft 2 is connected with an eccentric wheel 21, 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 both sides of the first shaft 2, so as to improve the stability of the overall 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 center of mass of the eccentric wheel 21 can be adjusted in the following ways, including but not limited to: arranging the eccentric wheel 21 as a non-central symmetric structure, for example Figure 9As shown, the protruding part 211 is arranged on one side of the eccentric wheel 21, so that the center of mass of the eccentric wheel 21 deviates from the eccentric shaft 4; different densities of materials are used at different positions of the eccentric wheel 21; a counterweight is connected to one side of the eccentric wheel 21 or the eccentric wheel 21 is subjected to subtractive machining, for example Figure 9 As shown, the connecting member openings of the eccentric wheel 21 for connecting with the first shaft 2 are concentrated on the side of the eccentric wheel 21 away from the eccentric shaft 4, so that after the connecting member is installed, the connecting member is concentrated on the side of the eccentric wheel 21 away from the eccentric shaft 4, thereby deviating the center of mass of the eccentric wheel 21 from the eccentric shaft 4.

[0068] In a specific embodiment, the saw blade 6 is provided with two limiting stops 11, the front ends of the two limiting stops 11 extend beyond the front end of the saw blade 6, and the distance between the limiting stops 11 is greater than the diameter of the tree or bamboo to be cut. In use, the tree or bamboo can be clamped between the front ends of the two limiting stops, and then the saw blade is cut to avoid the saw blade slipping and directly separating from the tree or bamboo, thereby improving the stability during cutting. The specific structure of the limiting stop 11 includes but is not limited to a plate structure, a rod structure, and a block structure.

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

[0070] In a specific embodiment, a connecting 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 connecting seat 12, which is convenient for holding. The handle 8 can be a shaft-shaped member, and the cross-sectional shape of the handle 8 is an ellipse, so that the operator can judge the orientation of the current saw blade 6 according to the hand feeling.

[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 parts 81 are arranged on the handle 8 and are spaced apart along the length direction of the handle 8. The gripping parts 81 can be further provided with anti-slip patterns or anti-slip materials such as rubber.

[0073] In a specific embodiment, an energy storage module 9 is connected to the handle 8, 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 is matched with the driving device 7, for example, if the driving device 7 is an electric motor, the energy storage module 9 is 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 air cylinder, the energy storage module 9 is a gas storage tank.

[0074] In a specific embodiment, a controller is connected to the handle 8, and is communicatively connected to the driving device 7, for controlling the start and stop of the driving device 7, so that the operator can more safely remotely control the cutting state of the saw blade 6. The specific form of the communicatively connection includes but is not limited to wired connection and wireless connection.

[0075] In a specific embodiment, the controller is also used to control the rotating speed of the driving device 7; specifically, the controller can include a knob, a roller, a pull rod, and other control devices whose output signals can change with the input changes, so that the rotating speed of the driving device 7 can be adjusted by rotating the knob, the rotating speed of the driving device 7 can be adjusted by rolling the roller, and the rotating speed of the driving device 7 can be adjusted by pushing and pulling the pull rod.

[0076] The controller described in the present application is a commonly used controller, and the improvement of the controller program is not involved in the present application.

[0077] In an optional embodiment, the energy storage module 9 is detachably connected to the handle 8. The specific form of the detachable connection includes but is not limited to: using a threaded connecting piece to connect the energy storage module 9 to the handle 8; providing a socket on the energy storage module 9, and making the handle 8 pass through the socket to achieve plug-in connection; using existing products, such as a clamp and a cable tie, to connect the energy storage module 9 to the handle 8.

[0078] The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present application. It should be understood that the above description is only a specific embodiment of the present application, and is not used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A portable felling device, characterized in that, The base (1), the driving device (7), the rocker arm (5) and the saw blade (6) are included. One end of the rocker arm (5) is a rotating end, which is movably connected with the base (1) through the second shaft (3), and the rocker arm (5) can swing back and forth in the plane direction of the vertical axis around the axis of the second shaft (3). The other end of the rocker arm (5) is a swinging end, which is movably connected with the driving device (7), and the driving device (7) is installed on the base (1) and can drive the swinging end to swing back and forth. The front end of the saw blade (6) is provided with a sawtooth, and the rear end is installed on the rotating end of the rocker arm (5). When the driving device (7) drives the swinging end of the rocker arm (5) to swing back and forth, the rotating end of the rocker arm (5) reciprocates, 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) 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 with the swinging 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 swinging end of the rocker arm (5) to swing back and forth.

3. A portable felling device according to claim 2, characterized in that The swinging end of the rocker arm (5) is provided with a clamping groove, the eccentric shaft (4) is arranged in the clamping groove and abuts against the side wall of the clamping groove, the longitudinal direction size of the clamping groove coinciding with the radial direction of the second shaft (3) is greater than the size of the eccentric shaft (4), the transverse direction size of the clamping groove perpendicular to the longitudinal direction matches the size 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 clamping groove.

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 clamping groove.

5. A portable felling device according to claim 3, characterized in that A wear-resistant pad layer (51) is arranged on the side wall of the clamping groove 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 centers of mass of the eccentric wheel (21) and the eccentric shaft (4) are respectively located on the 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 the side of the base (1) away from the saw blade (6).

8. A portable felling device according to claim 7, characterized in that Limiting stops (11) are arranged on the two sides of the saw blade (6), the front ends of the two limiting stops (11) extend beyond the front end of the saw blade (6), and the limiting stops (11) have spaces for the saw blade (6) to swing at the positions where the heights of the limiting stops (11) are flush with the saw blade (6).

9. A portable felling device according to claim 7, characterized in that An energy storage module (9) is connected to the handle (8), and the energy storage module (9) is used for providing energy to the driving device (7).

10. A portable felling device according to claim 9, characterized in that A gripping portion (81) is arranged on the handle (8).

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