A brush cutter for forest maintenance

Abstract

The application relates to the technical field of garden pruning equipment, and discloses a brush cutter for forest land repair, which comprises a driving piece and a handheld rod, the handheld rod is connected with a connecting rod through a connecting head, the driving piece is in transmission connection with a cutting knife through a flexible shaft, the handheld rod and the connecting head are fixedly connected, the connecting head is hingedly connected with the connecting rod, a hinge shaft is arranged close to the end of the connecting rod, a first limiting structure is arranged on the connecting head, the farthest point of the cutting knife is point A, and the first limiting structure is configured to limit the rotation of the connecting rod in the same direction as the movement direction of point A. When the brush cutter for forest land repair is operated along the correct direction, the connecting rod cannot rotate; when a tree is accidentally touched along the wrong direction, the connecting rod can rotate along the wrong direction; during the cutting through of the tree, the acting force between the tree and the cutting knife drives the connecting rod to rotate, force is unloaded, sudden impact force cannot act on the operator, and the safety during use is improved.

Description

Technical Field

[0001] This application relates to the field of garden pruning equipment technology, and more particularly to a brush cutter for forest land restoration. Background Technology

[0002] Backpack brush cutters are common brush cutters used for forest land restoration. Their key feature is that the engine is carried on the operator's back, with power transmitted to the cutting head via a flexible shaft. This type of brush cutter is powerful and suitable for large-area, long-duration brush cutting operations. Because the engine is on the back, the operator can better control the position and direction of the cutting head with both hands, resulting in greater operational flexibility.

[0003] Because of the need for pruning branches, brush cutters typically have long handles, resulting in a long lever arm between the user and the blade. Since some branches are thick, the user experiences a significant reaction force during cutting. Therefore, the user is easily affected by the blade's reaction force. For user safety, brush cutters generally only cut branches in one direction. For example, when the blade rotates clockwise, the force between the blade and the branch is to the right, meaning cutting can only be done from right to left. Cutting from left to right, however, causes a sudden release of force at the moment the branch is cut through, as the force is now released abruptly. Because the user and the blade experience the same force at this moment, the user will lurch to the right, easily losing balance and falling. Furthermore, moving the blade left and right while pruning trees can easily lead to accidental contact with branches from left to right, posing a significant safety hazard.

[0004] In order to improve repair efficiency, some users will use more force when cutting thicker branches, causing the blade to hit the branch, which can easily damage the blade and transmission system. Summary of the Invention

[0005] This application proposes a brush cutter for forest land restoration. When a tree is accidentally struck in the wrong direction, the connecting rod can rotate in the wrong direction to relieve the force, so that the sudden burst force will not act on the operator, thus improving the safety during use.

[0006] To achieve the above objectives, this application adopts the following technical solution: a brush cutter for forest land restoration, comprising a drive unit and a handheld rod, characterized in that the handheld rod is connected to a connecting rod via a connector, the end of the connecting rod is provided with a cutting head, the cutting head is connected to a cutting blade, the drive unit is connected to the cutting blade via a flexible shaft, the handheld rod and the connector are fixedly connected, the connector is hinged to the connecting rod, the hinge shaft is close to the end of the connecting rod, the connector is provided with a first limiting structure, the farthest point of the cutting blade is point A, the first limiting structure is configured to restrict the connecting rod from rotating in the same direction as the movement direction of point A, the connector is also provided with a buffer energy dissipation component that can prevent the connecting rod from rotating in the limiting state, the buffer energy dissipation component is located on the side opposite to the first limiting structure.

[0007] Furthermore, the connecting rod is equipped with a drive shaft, which is connected to the cutting blade. A gap is left between the drive shaft and the end of the connecting rod, and the driving component is connected to the drive shaft via a flexible shaft.

[0008] Furthermore, the buffer energy dissipation component includes a second limiting structure that can switch between limiting states. When the second limiting structure is switched to not restricting the movement of the connecting rod, the connecting rod can rotate. The handheld rod or the connecting rod is also equipped with a sensor that can monitor the movement direction of the handheld rod and the connecting rod. When the sensor detects that the movement direction of the handheld 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 handheld rod and the connecting rod is opposite to the movement direction of point A, the second limiting structure is adjusted to the unlimited state.

[0009] Furthermore, the connector includes a connector seat, and a connector sleeve is fixedly connected to the side of the connector seat facing the hand handle. The connector sleeve is fitted onto the hand handle and is fixedly connected to the hand handle by bolts. The connector seat is provided with a transverse connector groove, and the connector seat is connected to the connector rod through the connector groove. The connector rod is hinged to the connector seat, and the first limiting structure is one side wall of the connector groove.

[0010] Furthermore, the second limiting structure includes a telescopic cylinder and a connecting block. The telescopic cylinder is fixedly installed on the other side wall 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 opens when the sensor detects that the movement direction of the handheld rod and the connecting rod is opposite to the movement direction of point A, and closes when the sensor detects that the movement direction of the handheld rod and the connecting rod is the same as the movement direction of point A.

[0011] Furthermore, the sensor includes a sliding sleeve fitted on the handle, the sliding sleeve being movably connected to the handle, pressure sensors being provided at both ends of the sliding sleeve, and an elastic sleeve being provided between the pressure sensors and the sliding sleeve, the elastic sleeve enabling the sliding sleeve to return to its original position, and the direction of movement of the hand handle and connecting rod being determined by judging the pressure difference between the pressure sensors on both sides.

[0012] Furthermore, the buffer energy dissipation element is configured to impede the rotation of the connecting rod through damping.

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

[0014] The beneficial effects of this invention are as follows:

[0015] This application provides a brush cutter for forest land restoration. When operating in the correct direction, the connecting rod will not rotate. However, when accidentally hitting 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, thus dissipating the force and preventing the sudden burst of force from acting on the operator. This improves safety during use and also enables bidirectional operation.

[0016] Because the connecting rod can rotate, it will automatically release force when the operator accidentally hits a tree with excessive force, thus extending the service life of the equipment. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort:

[0018] Figure 1 This is a schematic diagram of the present invention;

[0019] Figure 2 This is a partial schematic diagram of the present invention;

[0020] Figure 3 For the present invention Figure 2 A bottom view;

[0021] Figure 4 This is a schematic diagram showing the connection between the drive shaft and the flexible shaft in this invention;

[0022] Figure 5 This is a schematic diagram of the connection and buffer energy dissipation component in Embodiment 1 of the present invention;

[0023] Figure 6 For the present invention Figure 2 A magnified view of B in the middle.

[0024] In the diagram: 1. Drive unit; 2. Flexible shaft; 3. Hand handle; 4. Connecting rod; 5. Cutting blade; 6. Drive shaft; 7. Cutting head; 8. Connecting head; 81. Connecting seat; 82. Connecting sleeve; 83. Connecting groove; 9. Buffer energy dissipation component; 91. Telescopic cylinder; 92. Connecting block; 93. Pin; 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 Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example

[0026] Please see Figures 1-4 A brush cutter for forest land restoration includes a drive unit 1 and a handheld lever 3. The handheld lever 3 is connected to a connecting rod 4 via a connector 8. A cutting head 7 is located at the end of the connecting rod 4, and a cutting blade 5 is connected to the cutting head 7. The drive unit 1 is connected to the cutting blade 5 via a flexible shaft 2. A drive shaft 6 is located inside the connecting rod 4 and is connected to the cutting blade 5. A gap is left between the drive shaft 6 and the end of the connecting rod 4. The drive unit 1 is connected to the drive shaft 6 via the flexible shaft 2. The portion of the flexible shaft 2 passing through the handheld lever 3 and the connecting rod 4 is connected to the drive shaft 6 inside the connecting rod 4. Transmission between the drive shaft 6 and the cutting blade 5 is achieved via a bevel gear. A connector is located at the end of the drive shaft 6 for detachable connection to the flexible shaft 2. The bevel gear is located inside the cutting head 7. Figures 1-3 The bevel gear is omitted. The drive unit 1 is mounted on the back frame. The drive unit 1 can be an electric motor or an internal combustion engine. A buffer structure is provided between the back frame and the drive unit 1. The handheld lever 3 and the connecting head 8 are fixedly connected. The connecting head 8 is hinged to the connecting rod 4. The hinge shaft is close to the end of the connecting rod 4 to reduce the displacement of the opposite ends of the connecting rod 4 and the handheld lever 3. The connecting head 8 is provided with a first limiting structure. The first limiting structure is configured to restrict the connecting rod 4 from rotating in the same direction as the direction of movement of the farthest point of the cutting blade 5. For example, in the attached... Figure 3In the middle, the cutting blade 5 rotates clockwise, and the farthest point A moves to the left, so the limiting structure restricts the connecting rod 4 from rotating to the left;

[0027] The connector 8 is also equipped with a buffer energy dissipation component 9 that can prevent the connecting rod 4 from rotating in a limiting state. The buffer energy dissipation component 9 is located on the opposite side of the first limiting structure. The buffer energy dissipation component 9 includes a second limiting structure that can switch the limiting state. When the second limiting structure is switched to not restricting the movement of the connecting rod 4, the connecting rod 4 can rotate. The handheld lever 3 or the connecting rod 4 is also equipped with a sensor 11 that can detect the movement direction of the handheld lever 3 and the connecting rod 4. The sensor 11 can be an accelerometer, a gyroscope, a geomagnetic sensor, etc., as long as it can detect the movement direction of the handheld lever 3 and the connecting rod 4. When the sensor 11 detects that the movement direction of the handheld lever 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 When A moves to the left, the buffer energy dissipation component 9 restricts the connecting rod 4 from rotating to the right, allowing the cutting blade 5 to cut normally to the left. When the sensor 11 detects that the movement direction of the handheld rod 3 and the connecting rod 4 is opposite to the movement direction of point A, the buffer energy dissipation component 9 is adjusted to an unrestricted state. At this time, the user cuts to the right. Since the buffer energy dissipation component 9 is unrestricted, when the cutting blade 5 cuts through the branch, the force between the cutting blade 5 and the branch causes the connecting rod 4 to rotate sharply to the right, relieving the reaction force on the cutting blade 5 and preventing the user from losing their center of gravity.

[0028] Please see Figure 5 The connector 8 includes a connector seat 81. A connector sleeve 82 is fixedly connected to the side of the connector seat 81 facing the hand handle 3. The connector sleeve 82 is fitted onto the hand handle 3 and is fixedly connected to the hand handle 3 by bolts, which facilitates disassembly and makes the force on the connector 8 more reasonable. The connector seat 81 is provided with a transverse connector groove 83. The connector seat 81 is connected to the connector rod 4 through the connector groove 83. The connector rod 4 is hinged to the connector seat 81. The first limiting structure is one side wall of the connector groove 83. The connector rod 4 can rotate along the connector groove 83.

[0029] The second limiting structure includes a telescopic cylinder 91 and a connecting block 92. The telescopic cylinder 91 is fixedly installed 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. To facilitate the disassembly of the pin 93, the connecting seat 81 has a through hole corresponding to the position of the pin 93. The telescopic cylinder 91 is connected to a pressure cylinder 94. A control valve 95 is provided between the pressure cylinder 94 and the telescopic cylinder 91. The medium between the telescopic cylinder 91 and the pressure cylinder 94 is liquid, which naturally achieves buffering during its flow. The energy dissipation function prevents rebound. Control valve 3 (95) opens when sensor 11 detects that the movement direction of the hand lever 3 and 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 lever 3 and connecting rod 4 is the same as the movement direction of point A. When sensor 11 is open, telescopic cylinder 91 can extend and retract freely. When sensor 11 is closed, telescopic cylinder 91 cannot retract, restricting the rotation of connecting rod 4. Pressure cylinder 94 is equipped with a spring that maintains the pressure of the medium inside pressure cylinder 94, ensuring that the medium can flow back into telescopic cylinder 91, thereby resetting connecting rod 4. Example

[0030] Example 2 is largely the same as Example 1, except that the buffer energy dissipation component 9 is configured to dampen the rotation of the connecting rod 4 to achieve buffer energy dissipation.

[0031] When cutting down trees, for example, in the attached Figure 3 In the middle, the cutting blade 5 rotates clockwise. When cutting to the left, the connecting rod 4 rotates when the cutting blade 5 contacts the tree to relieve force and reduce the cutting speed, preventing it from cutting through the tree too quickly if it accidentally touches the tree on the left. After cutting through, the force between the cutting blade 5 and the tree causes the connecting rod 4 to return to its original position. The damping can prevent excessive impact force from catching the operator off guard. When cutting to the right, the connecting rod 4 can not rotate after reaching its maximum rotation, so as not to affect normal operation. At the same time, it can also limit the collision when it comes into contact with the tree.

[0032] Please see Figure 3The connector 8 is hinged to a support rod 12. The support rod 12 includes a rotating rod 121 hinged to the connector 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. The support block 122 is fixedly connected to the connecting rod 4 by bolts. The handheld rod 3 is provided with an arc-shaped groove 123. The other end of the rotating rod 121 is connected to the arc-shaped groove 123 through a moving block 124. The moving block 124 slides in the arc-shaped groove 123. The center of the arc-shaped groove 123 is located on the hinge axis. Since the depth of the connecting groove 83 is relatively low, if it were deeper, it would restrict the rotation angle of the connecting rod 4. In order to ensure a sufficient buffer angle, it is necessary to... The longer connecting groove 83 results in a larger volume of the connector 8, while the shallower connecting groove 83 weakens the support capacity for the connecting rod 4. In order to balance the support force and ensure a suitable volume, a support rod 12 is used to support the connecting rod 4. The arc-shaped groove 123 is sleeved on the hand handle 3 through a tube sleeve and fixed in position with bolts. A damping structure is provided between the moving block 124 and the arc-shaped groove 123. A spring is provided between the moving block 124 and the arc-shaped groove 123 to enable the moving block 124 to return to its original position. The spring can buffer the impact force suddenly generated by the cutting blade 5 and ensure that the cutting blade 5 can return to its original position. In other embodiments, the support rod 12 can also be used in Embodiment 1. Example

[0033] Example 3 is based on Example 1. Please refer to Example 3. Figure 6 The sensor 11 includes a sliding sleeve 112 sleeved on the handle 10. The sliding sleeve 112 is movably connected to the handle 10. Pressure sensors 111 are provided at both ends of the sliding sleeve 112. An elastic sleeve 113 is provided between the pressure sensors 111 and the sliding sleeve 112. The elastic sleeve 113 enables the sliding sleeve 112 to return to its original position. The direction of movement of the hand lever 3 and the connecting rod 4 is determined by judging the pressure difference between the two pressure sensors 111. For example, the difference between the left elastic sleeve 113 and the right elastic sleeve 113 is calculated. When the difference is positive, the pressure on the left side is greater, indicating that the sliding sleeve 112 is moving to the left and the operator is pushing the hand lever 3 and the connecting rod 4 to the left. Conversely, when the difference is negative, the operator is moving the hand lever 3 and the connecting rod 4 to the right.

[0034] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily 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 invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A brush cutter for forest land restoration, comprising a drive unit (1) and a hand handle (3), characterized in that, The handheld lever (3) is connected to a connecting rod (4) via a connector (8). The end of the connecting rod (4) is provided with a cutting head (7), and the cutting head (7) is connected to a cutting blade (5). The driving component (1) is connected to the cutting blade (5) via a flexible shaft (2). The handheld lever (3) and the connector (8) are fixedly connected. The connector (8) is hinged to the connecting rod (4), and the hinge shaft is close to the end of the connecting rod (4). The connector (8) is provided with a first limiting structure. The farthest point of the cutting blade (5) is point A. The first limiting structure is configured to restrict the connecting rod (4) from rotating in the same direction as the movement direction of point A. The connector (8) is also provided with a buffer energy dissipation component (9) that can prevent the connecting rod (4) from rotating in the limiting state. The buffer energy dissipation component (9) is located on the side opposite to the movement direction of point A. The connecting rod (4) is provided with a transmission shaft (6) for transmission. The shaft (6) is connected to the cutting blade (5) in a transmission connection. The transmission shaft (6) leaves a gap from the port of the connecting rod (4). The driving component (1) is connected to the transmission shaft (6) in a transmission connection via a flexible shaft (2). The buffer energy dissipation component (9) includes a second limiting structure that can switch the limiting state. When the second limiting structure is switched to not restricting the movement of the connecting rod (4), the connecting rod (4) can rotate. The handheld rod (3) or the connecting rod (4) is also provided with a sensor (11). The sensor (11) can monitor the movement direction of the handheld rod (3) and the connecting rod (4). When the sensor (11) detects that the movement direction of the handheld 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 handheld rod (3) and the connecting rod (4) is opposite to the movement direction of point A, the second limiting structure is adjusted to the unlimited state.

2. The brush cutter for forest land restoration according to claim 1, characterized in that, The connector (8) includes a connector (81), and a connector sleeve (82) is fixedly connected to the side of the connector (81) facing the hand handle (3). The connector sleeve (82) is fitted on the hand handle (3) and is fixedly connected to the hand handle (3) by bolts. The connector (81) is provided with a transverse connector groove (83). The connector (81) is connected to the connecting rod (4) through the connector groove (83). The connecting rod (4) is hinged to the connector (81). The first limiting structure is one side wall of the connector groove (83).

3. The brush cutter for forest land restoration according to claim 2, characterized in that, The second limiting structure includes a telescopic cylinder (91) and a connecting block (92). The telescopic cylinder (91) is fixedly installed 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). 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) opens 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 closes 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.

4. The brush cutter for forest land restoration according to claim 3, characterized in that, The sensor (11) includes a sliding sleeve (112) sleeved on the handle (10). The sliding sleeve (112) is movably connected to the handle (10). Pressure sensors (111) are provided at both ends of the sliding sleeve (112). An elastic sleeve (113) is provided between the pressure sensor (111) and the sliding sleeve (112). The elastic sleeve (113) enables the sliding sleeve (112) to reset. The direction of movement of the hand lever (3) and the connecting rod (4) is determined by judging the pressure difference between the two pressure sensors (111).

5. The brush cutter for forest land restoration according to claim 2, characterized in that, The buffer energy dissipation element (9) is configured to impede the rotation of the connecting rod (4) by means of damping.

6. The brush cutter for forest land restoration according to claim 4, characterized in that, The buffer energy dissipation component (9) includes a support rod (12), which includes a rotating rod (121) hinged to the connector (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). The support block (122) is fixedly connected to the connecting rod (4) by bolts. An arc groove (123) is provided on the hand handle (3). The other end of the rotating rod (121) is connected to the arc groove (123) through a moving block (124). A damping structure is provided between the moving block (124) and the arc groove (123).

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