Brush cutter for woodland repairing

Abstract

The invention relates to the technical field of garden pruning equipment, and discloses a brush cutter for forest land repairing, which comprises a driving part and a handheld rod, the handheld rod is connected with a connecting rod through a connector, the driving part is in transmission connection with a cutting knife through a flexible shaft, the handheld rod is fixedly connected with the connector, the connector is hinged to the connecting rod, and the connecting rod is connected with the connecting rod through a flexible shaft. The hinge shaft is close to the end of the connecting rod, a first limiting structure is arranged on the connector, the farthest point of the cutting knife is a point A, and the first limiting structure is constructed to be capable of limiting the connecting rod to rotate in the direction the same as the moving direction of the point A. According to the brush cutter for woodland repairing, when the brush cutter works in the correct direction, the connecting rod cannot rotate, when a tree is touched by mistake in the wrong direction, the connecting rod can rotate in the wrong direction, and when the tree is cut through, the acting force between the tree and the cutting knife drives the connecting rod to rotate and unload the force; therefore, sudden impulsion force cannot act on the body of an operator, and the safety in use is improved.

Description

Technical Field

[0001] The present application relates to the technical field of garden pruning equipment, and in particular to a brush cutter used for repairing woodland. Background Art

[0002] Backpack brush cutters are common brush cutters used for forestry repair. They are characterized by the engine being carried on the operator's back, with the power being transmitted to the cutting head through a flexible shaft. This type of brush cutter has strong power and is suitable for large-scale, long-term brush cutting operations. Because the engine is carried on the back, both hands can better control the position and direction of the cutting head during operation, and the operation flexibility is high.

[0003] For the purpose of pruning branches, garden brush cutters usually have a long hand-held pole, and the force arm between the user and the blade is long. Some branches are thick, and people will be subjected to a large reaction force when cutting. Therefore, the user is easily affected by the reaction force of the blade. For the safety of the user, generally speaking, the brush cutter can only cut branches in one direction. For example, when the cutting knife rotates clockwise, the force between the blade and the branch is to the right, and the cutting can only be done from right to left. When cutting from left to right, at the moment of cutting through the branch, the branch is no longer blocked, and the force between the branch and the blade is suddenly released. Since the user and the knife are subjected to the same force direction at this time, they will suddenly jump to the right, which can easily cause the user to lose balance and fall. When the user moves the cutting knife left and right when pruning trees, it is easy to accidentally touch the branch from left to right, which poses a great safety hazard.

[0004] For the sake of repair efficiency, some users will use greater force to make the blade hit the branch when cutting thicker branches, which can easily damage the blade and transmission system. Summary of the invention

[0005] The present application proposes a brush cutter for forest land repair. When a tree is accidentally touched in the wrong direction, the connecting rod can rotate in the wrong direction to unload the force so that the sudden explosive force will not act on the operator, thereby improving safety during use.

[0006] To achieve the above-mentioned purpose, the present application adopts the following technical scheme: a brush cutter for forest land repair, comprising a driving member and a hand-held rod, characterized in that the hand-held rod is connected to a connecting rod through a connecting head, a cutting head is provided at the end of the connecting rod, and the cutting head is connected to a cutting knife, the driving member is transmission-connected to the cutting knife through a flexible shaft, the hand-held rod and the connecting head are fixedly connected, the connecting head is hinged to the connecting rod, the hinge axis is close to the end of the connecting rod, a first limiting structure is provided on the connecting head, the farthest point of the cutting knife is point A, the first limiting structure is configured to limit the connecting rod from rotating in the same direction as the movement direction of point A, and a buffering energy-dissipating member is also provided on the connecting head, the limiting state of which can hinder the rotation of the connecting rod, and the buffering energy-dissipating member is arranged on the side opposite to the first limiting structure.

[0007] Furthermore, a transmission shaft is provided in the connecting rod, the transmission shaft is transmission-connected to the cutting knife, a gap is left between the transmission shaft and the end of the connecting rod, and the driving member is transmission-connected to the transmission shaft via a flexible shaft.

[0008] Furthermore, the buffer and energy dissipation component includes a second limiting structure whose limiting state can be switched. When the second limiting structure is switched to not restricting the movement of the connecting rod, the connecting rod can rotate. A sensor is also provided on the hand-held rod or the connecting rod. The sensor can monitor the movement direction of the hand-held rod and the connecting rod. When the sensor detects that the movement direction of the hand-held rod and the connecting rod is the same as the movement direction of point A, the second limiting structure is adjusted to the limiting state. When the sensor detects that the movement direction of the hand-held rod and the connecting rod is opposite to the movement direction of point A, the second limiting structure is adjusted to the non-limiting state.

[0009] Furthermore, the connecting head includes a connecting seat, a connecting sleeve is fixedly connected to the side of the connecting seat facing the hand-held rod, the connecting sleeve is arranged on the hand-held rod, the connecting sleeve is fixedly connected to the hand-held rod by bolts, a transverse connecting groove is provided on the connecting seat, the connecting seat is connected to the connecting rod through the connecting groove, the connecting rod is hinged to the connecting seat, and the first limiting structure is a side wall of the connecting groove.

[0010] Furthermore, the second limiting structure includes a telescopic cylinder and a connecting block, the telescopic cylinder is fixedly installed on the side wall on the other side of the connecting seat, the connecting block is fixedly connected to the connecting rod, the connecting block and the telescopic cylinder are hinged, a pin is provided between the connecting block and the telescopic cylinder, the telescopic cylinder is connected to a pressure cylinder, a control valve three is provided between the pressure cylinder and the telescopic cylinder, the control valve three is opened when the sensor detects that the movement direction of the hand-held rod and the connecting rod is opposite to the movement direction of point A, and is closed when the sensor detects that the movement direction of the hand-held rod and the connecting rod is the same as the movement direction of point A.

[0011] Furthermore, the sensor (11) comprises a sliding sleeve (112) sleeved on the handle (10), the sliding sleeve (112) being movably connected to the handle (10), pressure sensors (111) being provided at both ends of the sliding sleeve (112), an elastic sleeve (113) being provided between the pressure sensor (111) and the sliding sleeve (112), the elastic sleeve (113) enabling the sliding sleeve (112) to be reset, and the moving direction of the hand-held rod (3) and the connecting rod (4) being determined by determining the pressure difference between the pressure sensors (111) on both sides.

[0012] Furthermore, the buffer and energy dissipation member is configured to hinder the rotation of the connecting rod by damping.

[0013] Furthermore, the buffer and energy dissipation component includes a support rod, which includes a rotating rod hinged to a connecting head, wherein the hinge axis coincides with the hinge axis of the connecting rod, a support block is provided on one side of the rotating rod, and the support block is fixedly connected to the connecting rod by bolts, an arc groove is provided on the hand-held rod, and the other end of the rotating rod is connected to the arc groove by a moving block, and a damping structure is provided between the moving block and the arc groove.

[0014] The beneficial effects of the present invention are as follows: The present application provides a brush cutter for forest land repair. When operating in the correct direction, the connecting rod will not rotate. When the brush cutter accidentally touches a tree in the wrong direction, the connecting rod can rotate in the wrong direction. When cutting through the tree, the force between the tree and the cutting blade drives the connecting rod to rotate to unload the force so that the sudden explosive force will not act on the operator, thereby improving safety during use and realizing two-way operation.

[0015] Since the connecting rod can rotate, when the operator improperly uses excessive force to hit the tree during operation, the force will be automatically unloaded, thereby increasing the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below. Obviously, the drawings in the following description are only embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the provided drawings without creative work: Figure 1 It is a schematic diagram of the present invention; Figure 2 It is a partial schematic diagram of the present invention; Figure 3 For the present invention Figure 2 Bottom view of Figure 4 It is a schematic diagram of the connection between the transmission shaft and the flexible shaft in the present invention; Figure 5 It is a schematic diagram of the connection and buffering energy dissipation member in the first embodiment of the present invention; Figure 6 For the present invention Figure 2 Enlarged view of B.

[0017] In the figure: 1. driving member; 2. flexible shaft; 3. hand-held rod; 4. connecting rod; 5. cutting knife; 6. transmission shaft; 7. cutting head; 8. connecting head; 81. connecting seat; 82. connecting sleeve; 83. connecting groove; 9. buffer energy dissipation member; 91. telescopic cylinder; 92. connecting block; 93. pin shaft; 94. pressure cylinder; 95. control valve three; 10. handle; 11. sensor; 111. pressure sensor; 112. sliding sleeve; 113. elastic sleeve; 12. support rod; 121. rotating rod; 122. support block; 123. arc groove; 124. moving block. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example

[0019] See also Figure 1-Figure 4 A brush cutter for forest land repair includes a driving member 1 and a hand-held rod 3, the hand-held rod 3 is connected to a connecting rod 4 through a connecting head 8, a cutting head 7 is provided at the end of the connecting rod 4, and a cutting knife 5 is connected to the cutting head 7, the driving member 1 is connected to the cutting knife 5 through a flexible shaft 2, a transmission shaft 6 is provided in the connecting rod 4, the transmission shaft 6 is connected to the cutting knife 5, and a gap is left between the transmission shaft 6 and the end of the connecting rod 4, the driving member 1 is connected to the transmission shaft 6 through the flexible shaft 2, the flexible shaft 2 passes through the hand-held rod 3 and the connecting rod 4 and is connected to the transmission shaft 6 in the connecting rod 4, the transmission between the transmission shaft 6 and the cutting knife 5 is realized through a bevel gear, and a connecting head is provided at the end of the transmission shaft 6 for detachable connection with the flexible shaft 2, and the bevel gear is arranged in the cutting head 7, Figure 1-Figure 3 The bevel gear is omitted, and the driving member 1 is installed on the back frame. The driving member 1 can be a motor or an internal combustion engine. A buffer structure is provided between the back frame and the driving member 1. The hand-held rod 3 and the connecting head 8 are fixedly connected. The connecting head 8 is hinged to the connecting rod 4. The hinge axis is close to the end of the connecting rod 4 to reduce the displacement of the ends of the connecting rod 4 relative to the hand-held rod 3. A first limiting structure is provided on the connecting head 8. The first limiting structure is configured to limit the rotation of the connecting rod 4 in the same direction as the movement direction of the farthest point of the cutting knife 5, for example, in the attached Figure 3In the embodiment, the cutting blade 5 rotates clockwise, and the farthest point A moves to the left, so the limiting structure limits the connecting rod 4 to rotate to the left; The connector 8 is also provided with a buffering energy dissipating member 9 which can hinder the rotation of the connecting rod 4 in a limiting state. The buffering energy dissipating member 9 is arranged on the side opposite to the first limiting structure. The buffering energy dissipating member 9 includes a second limiting structure whose limiting state can be switched. When the second limiting structure is switched to not restricting the movement of the connecting rod 4, the connecting rod 4 can rotate. A sensor 11 is also provided on the hand-held rod 3 or the connecting rod 4. The sensor 11 can monitor the movement direction of the hand-held rod 3 and the connecting rod 4. 14 can be an acceleration sensor, a gyroscope sensor, a geomagnetic sensor, etc., as long as the movement direction of the hand-held rod 3 and the connecting rod 4 can be detected. When the sensor 11 detects that the movement direction of the hand-held rod 3 and the connecting rod 4 is the same as the movement direction of point A, the second limiting structure is adjusted to the limiting state. For example, in the attached Figure 3 , A moves to the left, at this time, the buffer energy dissipation member 9 limits the connecting rod 4 to rotate to the right, so that the cutting knife 5 can cut to the left normally. When the sensor 11 detects that the movement direction of the hand-held rod 3 and the connecting rod 4 is opposite to the movement direction of point A, the buffer energy dissipation member 9 is adjusted to an unrestricted state. At this time, the user cuts to the right. Since the buffer energy dissipation member 9 is not limited, when the cutting knife 5 cuts through the branch, the force between the cutting knife 5 and the branch causes the connecting rod 4 to rotate to the right suddenly, thereby removing the reaction force on the cutting knife 5 and preventing the user from losing the center of gravity.

[0020] See also Figure 5 The connecting head 8 includes a connecting seat 81, and a connecting sleeve 82 is fixedly connected to the side of the connecting seat 81 facing the hand-held rod 3. The connecting sleeve 82 is sleeved on the hand-held rod 3. The connecting sleeve 82 is fixedly connected to the hand-held rod 3 by bolts, which is easy to disassemble and makes the force of the connecting head 8 more reasonable. A transverse connecting groove 83 is provided on the connecting seat 81. The connecting seat 81 is connected to the connecting rod 4 through the connecting groove 83. The connecting rod 4 is hinged to the connecting seat 81. The first limiting structure is a side wall of the connecting groove 83, and the connecting rod 4 can rotate along the connecting groove 83.

[0021] The second limiting structure includes a telescopic cylinder 91 and a connecting block 92. The telescopic cylinder 91 is fixedly mounted on the other side wall of the connecting seat 81. The connecting block 92 is fixedly connected to the connecting rod 4. The connecting block 92 and the telescopic cylinder 91 are hinged. A pin 93 is provided between the connecting block 92 and the telescopic cylinder 91 for easy disassembly. In order to facilitate the disassembly of the pin 93, a through hole is left at the position corresponding to the pin 93 of the connecting seat 81. The telescopic cylinder 91 is connected to a pressure cylinder 94. A control valve 3 95 is provided between the pressure cylinder 94 and the telescopic cylinder 91. The medium of the telescopic cylinder 91 and the pressure cylinder 94 is liquid. When it flows, buffering is naturally achieved. Energy dissipation function to avoid rebound. Control valve three 95 opens when sensor 11 detects that the movement direction of the hand-held rod 3 and the connecting rod 4 is opposite to the movement direction of point A, and closes when sensor 11 detects that the movement direction of the hand-held rod 3 and the connecting rod 4 is the same as the movement direction of point A. When the sensor 11 is turned on, the telescopic cylinder 91 can freely extend and retract. When the sensor 11 is turned off, the telescopic cylinder 91 cannot shrink, limiting the rotation of the connecting rod 4. The pressure cylinder 94 is provided with a spring to maintain the pressure of the medium in the pressure cylinder 94, ensuring that the medium can flow back into the telescopic cylinder 91, thereby resetting the connecting rod 4. Example

[0022] The second embodiment is substantially the same as the first embodiment, except that the buffering and energy dissipating member 9 is configured to achieve buffering and energy dissipation by hindering the rotation of the connecting rod 4 through damping.

[0023] When cutting trees, for example Figure 3 In the embodiment of the present invention, the cutting knife 5 rotates clockwise. When cutting to the left, when the cutting knife 5 contacts the tree, the connecting rod 4 rotates to unload the force and reduce the cutting speed to avoid cutting through the tree on the left side too quickly when the tree is accidentally touched. After cutting through, the force between the cutting knife 5 and the tree resets the connecting rod 4. The damping can avoid excessive impact force that catches the operator off guard. When cutting to the right, after the connecting rod 4 rotates to the maximum, it cannot rotate, which does not affect the normal operation. At the same time, it can also limit the collision when contacting the tree.

[0024] See also Figure 3The connecting head 8 is hinged to the support rod 12, and the support rod 12 includes a rotating rod 121 hinged to the connecting head 8. The hinge axis coincides with the hinge axis of the connecting rod 4. A support block 122 is provided on one side of the rotating rod 121, and the support block 122 is fixedly connected to the connecting rod 4 by bolts. An arc groove 123 is provided on the hand-held rod 3, and the other end of the rotating rod 121 is connected to the arc groove 123 through a moving block 124. The moving block 124 slides in the arc groove 123, and the center of the arc groove 123 is located on the hinge axis. Since the depth of the connecting groove 83 is relatively low, if it is deep, it will limit the rotation angle of the connecting rod 4. In order to ensure a sufficient buffer angle, it is necessary The longer connecting groove 83 makes the volume of the connecting head 8 larger, while the connecting groove 83 is shallow, and the supporting capacity of the connecting rod 4 is weakened. In order to take into account the supporting force and ensure the appropriate volume, the connecting rod 4 is supported by the support rod 12, and the arc groove 123 is sleeved on the hand-held rod 3 through a pipe sleeve, and the position is fixed with bolts after sleeved. A damping structure is provided between the moving block 124 and the arc groove 123, and a spring is provided between the moving block 124 and the arc groove 123 to reset the moving block 124. The spring can buffer the sudden impact force generated by the cutting knife 5, and at the same time ensure that the cutting knife 5 can be reset. In other embodiments, the support rod 12 can also be used in embodiment one. Example

[0025] Example 3 Based on Example 1, please refer to Figure 6 The sensor 11 includes 112 which is sleeved on the handle 10, and 112 is movably connected to the handle 10. Both ends of 112 are provided with 111, and 113 is provided between 111 and 112, and 113 enables 112 to be reset. The moving direction of the hand-held rod 3 and the connecting rod 4 is determined by judging the pressure difference of 111 on both sides. For example, the difference between 113 on the left side and 113 on the right side is calculated. When the difference is positive, the pressure on the left side is large, which means that 112 is moving to the left, and the operator is pushing the hand-held rod 3 and the connecting rod 4 to the left. On the contrary, if the difference is negative, the operator is moving the hand-held rod 3 and the connecting rod 4 to the right.

[0026] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A brush cutter for forest land repair, comprising a driving member (1) and a hand-held rod (3), characterized in that: The hand-held rod (3) is connected to a connecting rod (4) via a connecting head (8); a cutting head (7) is provided at the end of the connecting rod (4); the cutting head (7) is connected to a cutting knife (5); the driving member (1) is transmission-connected to the cutting knife (5) via a flexible shaft (2); the hand-held rod (3) and the connecting head (8) are fixedly connected; the connecting head (8) is hinged to the connecting rod (4); the hinge axis is close to the end of the connecting rod (4); a first limiting structure is provided on the connecting head (8); the farthest point of the cutting knife (5) is point A; the first limiting structure is configured to limit the rotation of the connecting rod (4) in the same direction as the movement direction of point A; the connecting head (8) is also provided with a buffering energy dissipation member (9) which can hinder the rotation of the connecting rod (4) in a limiting state; the buffering energy dissipation member (9) is provided on the side opposite to the movement direction of point A.

2. The brush cutter for forest land repair according to claim 1, characterized in that: A transmission shaft (6) is provided inside the connecting rod (4), the transmission shaft (6) is transmission-connected to the cutting blade (5), a gap is left between the transmission shaft (6) and the end of the connecting rod (4), and the driving member (1) is transmission-connected to the transmission shaft (6) via a flexible shaft (2).

3. The brush cutter for forest land repair according to claim 2, characterized in that: The buffer energy dissipation member (9) comprises a second limiting structure whose limiting state can be switched. When the second limiting structure is switched to not restricting the movement of the connecting rod (4), the connecting rod (4) can rotate. A sensor (11) is also provided on the hand-held rod (3) or the connecting rod (4). The sensor (11) can monitor the movement direction of the hand-held rod (3) and the connecting rod (4). When the sensor (11) detects that the movement direction of the hand-held rod (3) and the connecting rod (4) is the same as the movement direction of point A, the second limiting structure is adjusted to the limiting state. When the sensor (11) detects that the movement direction of the hand-held rod (3) and the connecting rod (4) is opposite to the movement direction of point A, the second limiting structure is adjusted to the non-limiting state.

4. The brush cutter for forest land repair according to claim 3, characterized in that: The connecting head (8) comprises a connecting seat (81), a connecting sleeve (82) being fixedly connected to one side of the connecting seat (81) facing the hand-held rod (3), the connecting sleeve (82) being sleeved on the hand-held rod (3), the connecting sleeve (82) being fixedly connected to the hand-held rod (3) via bolts, a transverse connecting groove (83) being provided on the connecting seat (81), the connecting seat (81) being connected to the connecting rod (4) via the connecting groove (83), the connecting rod (4) being hinged to the connecting seat (81), and the first limiting structure being a side wall of the connecting groove (83).

5. The brush cutter for forest land repair according to claim 4, characterized in that: The second limiting structure comprises a telescopic cylinder (91) and a connecting block (92); the telescopic cylinder (91) is fixedly mounted on the side wall of the other side of the connecting seat (81); the connecting block (92) is fixedly connected to the connecting rod (4); the connecting block (92) and the telescopic cylinder (91) are hinged; a pin shaft (93) is provided between the connecting block (92) and the telescopic cylinder (91); the telescopic cylinder (91) is connected to a pressure cylinder (94); a control valve three (95) is provided between the pressure cylinder (94) and the telescopic cylinder (91); the control valve three (95) is opened when the sensor (11) detects that the movement direction of the hand-held rod (3) and the connecting rod (4) is opposite to the movement direction of point A, and is closed when the sensor (11) detects that the movement direction of the hand-held rod (3) and the connecting rod (4) is the same as the movement direction of point A.

6. The brush cutter for forest land repair according to claim 5, characterized in that: The sensor (11) comprises a sliding sleeve (112) sleeved on the handle (10), the sliding sleeve (112) being movably connected to the handle (10), pressure sensors (111) being provided at both ends of the sliding sleeve (112), an elastic sleeve (113) being provided between the pressure sensor (111) and the sliding sleeve (112), the elastic sleeve (113) enabling the sliding sleeve (112) to be reset, and the moving direction of the hand-held rod (3) and the connecting rod (4) being determined by determining the pressure difference between the pressure sensors (111) on both sides.

7. The brush cutter for forest land repair according to claim 2, characterized in that: The buffering and energy dissipating member (9) is configured to hinder the rotation of the connecting rod (4) through damping.

8. The brush cutter for forest land repair according to claim 6, characterized in that: The buffering energy dissipation member (9) comprises a support rod (12), the support rod (12) comprising a rotating rod (121) hinged to a connecting head (8), the hinge axis coincident with the hinge axis of a connecting rod (4), a supporting block (122) is provided on one side of the rotating rod (121), the supporting block (122) is fixedly connected to the connecting rod (4) via bolts, an arc groove (123) is provided on the hand-held rod (3), the other end of the rotating rod (121) is connected to the arc groove (123) via a moving block (124), and a damping structure is provided between the moving block (124) and the arc groove (123).

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