Cultivation device and method for forest and grass resource protection

Abstract

The invention relates to the technical field of forest and grass resource protection, and particularly discloses a cultivation device and method for forest and grass resource protection. The sleeve is arranged at the bottom end of the diesel engine, and the output end of the diesel engine is rotatably inserted into an inner cavity of the sleeve; the first handle is arranged at the top of the outer wall of the sleeve; the steering switching mechanism is arranged at the bottom end of the sleeve; the emergency braking mechanism is arranged at the top of the outer wall of the sleeve; and the bidirectional saw blade is arranged at the bottom end of the steering switching mechanism. According to the device, when the device works in a narrow shrub or is tightly attached to a barrier, an operator can easily switch the cut-in angle, the working efficiency is optimized, meanwhile, the saw blade can automatically stop rotating during reverse misoperation, potential safety hazards such as accidental injury caused by misoperation are effectively prevented, and the working efficiency is improved. And a safer and more efficient tool support is provided for protection and cultivation of forest and grass resources.

Description

Technical Field

[0001] The present invention relates to the technical field of forest and grass resource protection, and specifically to a cultivation device and method for forest and grass resource protection. Background Art

[0002] Today, as the ecological environment has become a global focus, the protection and cultivation of forest and grassland resources are particularly important. Forest and grassland resources are not only a treasure house of biodiversity on Earth, but also the cornerstone of maintaining ecological balance, promoting climate stability, ensuring water security, and promoting sustainable economic and social development. With the intensification of human activities, forests and grasslands are facing unprecedented pressures, such as over-exploitation, fires, pests and diseases, etc. These factors seriously threaten the health and survival of forest and grassland resources. Therefore, the implementation of effective measures to protect and cultivate forest and grassland resources has become an urgent need to maintain ecological balance and promote green development. Among the many links in the protection and cultivation of forest and grassland resources, "forest clearing" as a basic and key operation plays a vital role. Forest clearing, also known as forest tending, refers to a series of management measures from the early growth stage to maturity of trees, such as weeding, thinning, pruning, etc., to ensure the survival of young forests, promote the healthy growth of trees, optimize forest stand structure, and improve forest quality and productivity. This process not only helps to reduce competition and provide sufficient growth space and light for trees, but also effectively prevents and controls pests and diseases, enhances the self-recovery ability of forests, and lays a solid foundation for the long-term sustainable development of forest and grassland resources. As an important tool in forest clearing operations, brush cutters have greatly improved the efficiency and quality of forest clearing operations due to their high efficiency and flexible operation characteristics. Brush cutters can quickly cut weeds, shrubs and small-path trees through high-speed rotating blades, effectively remove obstacles that affect the growth of trees, and create a more favorable growth environment for trees. However, brush cutters in the prior art have certain limitations in design; Specifically, brush cutters on the market generally use blades equipped with saw teeth. The design of these saw teeth has a distinct directional feature, that is, they are usually set to rotate counterclockwise to maximize cutting efficiency. However, this design also brings a significant defect: due to the limitation of the direction of rotation of the saw teeth, the operator often needs to cut the bushes from the right to the left when using the brush cutter. If an operator tries or mistakenly cuts from the left to the right, that is, operates against the direction of rotation of the saw teeth, the centrifugal force generated by the rotation of the blade will form a leftward thrust, which not only makes it difficult for the operator to maintain a stable operating posture, but also causes the risk of accidental injury to nearby workers or damage to surrounding vegetation due to the shift of the center of gravity and the unstable center of gravity; In addition, space limitation is also an important factor affecting the operational flexibility of brush cutters. In certain specific environments, such as in narrow bush areas or when working next to obstacles, cutting from right to left may not be realistic or extremely inconvenient. In this case, if you still insist on using the traditional counterclockwise rotating blade, not only will the operation efficiency be low, but it may also cause damage to the machine, personal injury or damage to the trees due to limited operation, and even affect the overall effect of forest cultivation due to the inability to effectively clear obstacles. Summary of the invention

[0003] The object of the present invention is to provide a cultivation device and method for protecting forest and grass resources, so as to at least solve the problems of potential safety hazards and space limitations proposed in the prior art.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a cultivation device and method for protecting forest and grass resources, comprising: a diesel engine; the sleeve is arranged at the bottom end of the diesel engine, and the output end of the diesel engine is rotatably plugged into the inner cavity of the sleeve; the first handle is arranged at the top of the outer wall of the sleeve; the steering switch mechanism is arranged at the bottom end of the sleeve; the emergency brake mechanism is arranged at the top of the outer wall of the sleeve; the bidirectional saw blade is arranged at the bottom end of the steering switch mechanism; The steering switching mechanism comprises: a first rotating rod, the top end of the first rotating rod is locked at the output end of the diesel engine through a coupling, the first rotating rod can be rotatably inserted into the inner cavity of the sleeve, and the bottom end of the first rotating rod can be rotatably extended out of the inner cavity of the sleeve; the top end of the first outer box is arranged at the bottom end of the first sleeve, the top end of the inner cavity of the first outer box is rotatably sleeved on the outer wall bottom of the first rotating rod through a bearing, and the bottom end of the first rotating rod is rotatably arranged at the inner cavity bottom end of the first outer box through a bearing, a moving groove connected to its inner cavity is opened in the middle part of the front side of the first outer box along the up and down direction, the left and right ends of the middle part of the front side of the inner cavity of the first outer box are both opened with a first slide groove in the left and right direction, and the left and right ends of the middle part of the front side of the inner cavity of the first outer box are both opened with two second slide grooves in the left and right direction, and the four The second slide groove is divided into the upper and lower sides located at the two first slide grooves, and the left and right sides of the first outer box are provided with telescopic grooves connected with its inner cavity; the left and right ends of the first guide rod are respectively arranged on the left and right sides of the inner cavity of the first slide groove; the left and right ends of the second guide rod are respectively arranged on the left and right sides of the inner cavity of the second slide groove; the number of the rotating cylinders is two, and the two rotating cylinders are rotatably connected to the bottom of the outer wall of the first rotating rod through bearings, and there is a gap between the two rotating cylinders; the number of the first calipers is several, and the several first calipers are respectively arranged on the inner sides of the two rotating cylinders at equal distances along the circumferential direction; the mounting seat is rotatably connected to the outer side of the outer wall of the rotating cylinder through bearings, and the front side of the mounting seat is arranged on the front side of the inner cavity of the first outer box; the first bevel gear is connected to the middle part of the outer wall of the rotating cylinder and is locked by a top screw.

[0005] Preferably, in order to link the first bevel gear for rotation, the steering switching mechanism also includes: a driving column, the number of the driving columns is several, and the several driving columns are respectively arranged at the bottom of the outer wall of the first rotating rod at equal distances along the circumferential direction; the linkage cylinder is slidably sleeved on the bottom of the outer wall of the first rotating rod, the linkage cylinder is located between the two rotating cylinders, and the outer wall of the linkage cylinder is provided with several driving grooves from top to bottom at equal distances along the circumference, the driving column is slidably adapted and plugged into the bottom end of the inner cavity of the driving groove corresponding to its position, and the top end of the linkage cylinder is in contact with the bottom end of the rotating cylinder located above; the number of the second calipers is several, and the several second calipers are respectively arranged at the upper and lower ends of the linkage cylinder at equal distances along the circumferential direction, the second caliper matches the first caliper, and the second caliper located at the top of the linkage cylinder is plugged into the first caliper located at the bottom end of the rotating cylinder located above.

[0006] Preferably, in order to adjust the rotation direction of the bidirectional saw blade, the steering switching mechanism also includes: a limit rod, the number of the limit rods is two, and the upper and lower ends of the two limit rods are respectively arranged on the upper and lower ends and left and right sides of the front side of the inner cavity of the first outer box; the upper and lower ends of the movable seat are rotatably sleeved on the upper and lower sides of the outer wall of the linkage cylinder through bearings, and the left and right ends of the front side of the movable seat are respectively slidably sleeved on the top ends of the outer walls of the two limit rods; the sliding column is arranged in the middle of the front side of the movable seat, and the outer wall of the sliding column can be slidably adapted and inserted into the top end of the inner cavity of the movable groove, and the front end of the sliding column extends out of the inner cavity of the movable groove; the number of the connecting rods There are two of them, and one end of the two connecting rods is rotatably set on the left and right sides of the outer wall of the sliding column through a pin shaft; the middle part of the outer wall of the first connecting rod is rotatably set on the other end of the connecting rod through a bearing; the first sliding block is slidably adapted and inserted into the inner side of the inner cavity of the first sliding groove, the first sliding block is slidably sleeved on the inner side of the outer wall of the first guide rod, and the front end of the first connecting rod is set on the rear side of the first sliding block; the first spring is embedded in the inner cavity of the first sliding groove, the first spring is sleeved on the outer wall of the first guide rod, one end of the first spring is clamped on the inner wall of the first sliding groove, and the other end of the first spring is clamped on the outer wall of the first sliding block.

[0007] Preferably, in order to promote the rotation of the bidirectional saw blade, the steering switching mechanism also includes: a second rotating rod, the middle part of the outer wall of the second rotating rod is rotatably arranged in the middle part of the rear side of the inner cavity of the first outer box through a bearing; the second bevel gear is sleeved on the front side of the outer wall of the second rotating rod and locked by a top screw, and the second bevel gear and the two first bevel gears are meshed; the front end of the universal joint is arranged at the rear end of the second rotating rod; the top end of the third rotating rod is arranged at the rear end of the universal joint, and the bidirectional saw blade is detachably sleeved on the bottom end of the outer wall of the third rotating rod; the top end of the guard plate is arranged on the rear side of the first outer box, the second rotating rod, the universal joint and the third rotating rod are all located in the inner cavity of the guard plate, and there is a gap between the second rotating rod, the universal joint and the third rotating rod and the inner wall of the guard plate, and the bidirectional saw blade is located in the inner cavity of the guard plate.

[0008] Preferably, the length of the inner cavity of the driving groove is greater than the distance between the bottom end of the linkage cylinder and the top end of the rotating cylinder located below.

[0009] Preferably, in order to drive the linkage cylinder and the rotating cylinder to separate, the emergency braking mechanism includes: a second outer box, the second outer box is sleeved on the top of the outer wall of the sleeve, and a third slide groove is opened on the front side of the inner cavity of the second outer box in the up and down directions; the upper and lower ends of the third guide rod are respectively arranged on the upper and lower sides of the inner cavity of the third slide groove; the rear end of the second connecting rod is rotatably arranged in the middle of the rear side of the inner cavity of the second outer box through a bearing, and the front end of the second connecting rod is rotatably extended out of the front side of the second outer box; the gear is sleeved on the rear part of the outer wall of the second connecting rod and locked by a top screw; the second slider is slidably adapted and inserted in the middle of the inner cavity of the third slide groove, and the second slider is slidably sleeved in the middle of the outer wall of the third guide rod; the middle of the front side of the pull block is arranged on the second slider rear side; the bottom end of the rack is arranged at the top end of the pull block, and the rack and the gear are meshed; the ring is arranged in the middle of the front side of the second outer box, the front end of the second connecting rod is located in the inner cavity of the ring, and the inner wall of the ring is provided with a plurality of slots equidistantly along the circumferential direction; the rear end of the second handle is arranged at the front end of the second connecting rod, and the second handle can be rotatably adapted to be inserted into the inner cavity of the ring, and the rear side of the outer wall of the second handle is provided with a plurality of extrusion grooves equidistantly along the circumferential direction; the second spring is embedded in the inner cavity of the extrusion groove, and one end of the second spring is clamped to the inner wall of the extrusion groove; a part of the clamping ball is embedded in the inner cavity of the extrusion groove, and the other part of the clamping ball extends into the inner cavity of the clamping groove corresponding to its position, and the other end of the second spring is clamped to the outer wall of the clamping ball.

[0010] Preferably, in order to prompt the bidirectional saw blade to stop rotating, the emergency brake mechanism also includes: a pull plate, the number of the pull plates is two, and the upper and lower ends of the front sides of the two pull plates can be slidably adapted and inserted into the inner sides of the inner cavities of the four second slide grooves, the front side of the pull plate is provided with a pull groove running through front and back in the left and right directions, and the rear side of the outer wall of the first connecting rod can be slidably adapted and inserted into the inner sides of the inner cavities of the pull grooves; the number of the first pulleys is two, and the two first pulleys are respectively arranged on the left and right sides of the second outer box; the number of the second pulleys is two, and the two second pulleys are respectively arranged on the left and right sides of the first outer box; the number of the pull ropes is two, one ends of the two pull ropes are respectively arranged on the outer sides of the two pull plates, the two pull ropes extend out of the inner cavity of the first outer box through the inner cavities of the two telescopic grooves, and overlap the outer walls of the two first pulleys and the two second pulleys, the two pull ropes can slidably extend into the inner cavity of the second outer box through the left and right sides of the second outer box, and the other ends of the two pull ropes are respectively arranged on the left and right sides of the pull block.

[0011] The present invention provides a cultivation device and method for protecting forest and grass resources, which have the following beneficial effects: 1. The present invention utilizes a diesel engine to drive the first rotating rod to rotate, and the first rotating rod can drive the linkage cylinder to rotate through the cooperation between the driving column and the driving groove. The rotation of the linkage cylinder can utilize the cooperation between the first caliper and the second caliper to prompt the rotating cylinder to drive the first bevel gear to rotate, so that the cooperation between the first bevel gear and the second bevel gear can drive the second rotating rod to rotate through the universal joint and the third rotating rod, thereby prompting the bidirectional saw blade to rotate, so as to perform shrubbery.

[0012] 2. In the present invention, when the rotation of the bidirectional saw blade needs to be changed, the sliding column is slid upward or downward, and the movement of the sliding column can drive the linkage cylinder to move upward or downward through the moving seat. At the same time, the position of the linkage cylinder can be fixed by the cooperation between the first spring, the first slider, the first connecting rod and the connecting rod, so that the rotation direction of the second bevel gear can be changed by changing the rotating cylinder in contact with the linkage cylinder, thereby changing the rotation angle of the bidirectional saw blade.

[0013] 3. When the present invention is operated incorrectly and the bush is operated in the direction opposite to the rotation of the saw teeth, the centrifugal force generated by the rotation of the blade will form a thrust, which makes it very easy for the two-way saw blade to detach from the bush and move quickly in the direction of the thrust. At this time, the two-way saw blade will be prompted to rotate quickly with the second handle as the center of the circle, thereby prompting the second handle to rotate. The rotation of the second handle can drive the gear to rotate through the second connecting rod, and the rotation of the gear can cooperate with the rack to drive the pull block to move up and down, so that the pull block can be used to pull the pull plate outward through the pull rope. At this time, the pull groove can be used to pull the first connecting rod to drive the first slider to move outward, and then the cooperation between the connecting rod, the sliding column and the moving seat can be used to drive the linkage cylinder to move, prompting the linkage cylinder and the rotating cylinder to separate, and stop the rotation of the two-way saw blade, thereby preventing accidental injury.

[0014] 4. When the device is operating in narrow bushes or close to obstacles, the operator can easily switch the cutting angle to optimize the working efficiency. At the same time, the saw blade can automatically stop rotating in the event of reverse operation, effectively preventing safety hazards such as accidental injuries caused by improper operation, and providing safer and more efficient tool support for the protection and cultivation of forest and grass resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 An exploded view of the present invention; Figure 3 It is an exploded diagram of the steering switching mechanism; Figure 4 It is a structural schematic diagram of the universal joint; Figure 5 for Figure 2 A magnified image of point A; Figure 6 for Figure 3 The enlarged view of point B; Figure 7 for Figure 3 Enlarged view of point C; Figure 8 for Figure 3 The enlarged view of point D; Fig. 9 for Figure 3 The enlarged view of point E; Fig.10 for Figure 3 The enlarged view of point F; Fig.11 for Figure 4 The enlarged view of G; Fig.12 for Figure 4 Enlarged view of H; Fig.13 for Figure 4A magnified view of point I; Fig.14 for Figure 4 Enlarged view of point J.

[0016] In the figure: 1, diesel engine; 2, sleeve; 3, first handle; 4, steering switching mechanism; 41, first rotating rod; 42, rotating cylinder; 43, first caliper; 44, mounting seat; 45, first bevel gear; 46, driving column; 47, first outer box; 48, moving groove; 49, first slide groove; 410, second slide groove; 411, first guide rod; 412, first spring; 413, second guide rod; 414, linkage cylinder; 415, driving groove; 416, second caliper; 417, moving seat; 418, sliding column; 419, connecting rod; 420, first connecting rod; 421, first slider; 422, telescopic groove; 4 23. Second rotating rod; 424. Second bevel gear; 425. Universal joint; 426. Third rotating rod; 427. Guard plate; 428. Limit rod; 5. Emergency brake mechanism; 51. Second outer box; 52. Third slide groove; 53. Third guide rod; 54. First pulley; 55. Second connecting rod; 56. Gear; 57. Second slider; 58. Pull block; 59. Rack; 510. Ring; 511. Slot; 512. Second handle; 513. Extrusion groove; 514. Second spring; 515. Cardan; 516. Pull plate; 517. Pull groove; 518. Second pulley; 519. Pull rope; 6. Bidirectional saw blade. DETAILED DESCRIPTION

[0017] 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.

[0018] See also Figure 1-Figure 14 The present invention provides a cultivation device and method technical solution for protecting forest and grass resources, including: a diesel engine 1, a casing 2, a first handle 3, a steering switching mechanism 4, an emergency braking mechanism 5 and a bidirectional saw blade 6. The casing 2 is arranged at the bottom end of the diesel engine 1, and the output end of the diesel engine 1 can be rotatably inserted into the inner cavity of the casing 2. The first handle 3 is arranged at the top of the outer wall of the casing 2, and the steering switching mechanism 4 is arranged at the bottom end of the casing 2. The steering switching mechanism 4 can change the optional direction of the bidirectional saw blade 6. The emergency braking mechanism 5 is arranged at the top of the outer wall of the casing 2. The emergency braking mechanism 5 is used to stop the rotation of the bidirectional saw blade 6. The bidirectional saw blade 6 is arranged at the bottom end of the steering switching mechanism 4. The bidirectional saw blade 6 is a prior art and will not be described in detail here. The bidirectional saw blade 6 is used for shrubs.

[0019] As a preferred embodiment, further, the steering switching mechanism 4 includes: a first rotating rod 41, a rotating cylinder 42, a first caliper 43, a mounting seat 44, a first bevel gear 45, a driving column 46, a first outer box 47, a moving groove 48, a first slide groove 49, a second slide groove 410, a first guide rod 411, a first spring 412, a second guide rod 413, a linkage cylinder 414, a driving groove 415, a second caliper 416, a moving seat 417, a slide column 418, a connecting rod 419, a first connecting rod 420, a first slider 421, a telescopic groove 422, a second rotating rod 423, a second bevel gear 424, a universal joint 425, a third rotating rod 426, a guard plate 427 and a limit rod 428, and the top end of the first rotating rod 41 is locked by a coupling. At the output end of the diesel engine 1, the first rotating rod 41 is rotatably inserted into the inner cavity of the sleeve 2, and the bottom end of the first rotating rod 41 is rotatably extended out of the inner cavity of the sleeve 2. The top end of the first outer box 47 is arranged at the bottom end of the sleeve 2, and the top end of the inner cavity of the first outer box 47 is rotatably sleeved on the outer wall bottom of the first rotating rod 41 through a bearing, and the bottom end of the first rotating rod 41 is rotatably arranged at the inner cavity bottom end of the first outer box 47 through a bearing. A movable groove 48 connected with the inner cavity is opened in the middle of the front side of the first outer box 47 along the up and down direction, and first slide grooves 49 are opened in the left and right directions at both ends of the middle of the front side of the inner cavity of the first outer box 47, and two second slide grooves 410 are opened in the left and right directions at both ends of the middle of the front side of the inner cavity of the first outer box 47. The four second slide grooves 410 are divided into the upper and lower sides of the two first slide grooves 49, and the left and right sides of the first outer box 47 are both provided with telescopic grooves 422 connected with the inner cavity thereof. The left and right ends of the first guide rod 411 are respectively arranged on the left and right sides of the inner cavity of the first slide groove 49, and the first guide rod 411 is used to prevent the first slider 421 from escaping from the inner cavity of the first slide groove 49, and the left and right ends of the second guide rod 413 are respectively arranged on the left and right sides of the inner cavity of the second slide groove 410, and the second guide rod 413 is used to prevent the pull plate 516 from escaping from the inner cavity of the second slide groove 410. There are two rotating drums 42, and the two rotating drums 42 are rotatably sleeved on the outer wall bottom of the first rotating rod 41 through bearings. There is a gap between the two rotating drums 42, and the rotating drum 42 is used to drive the first cone The bevel gear 45 rotates, the number of first calipers 43 is several, and the several first calipers 43 are respectively arranged on the inner sides of the two rotating cylinders 42 at equal distances along the circumferential direction, the mounting seat 44 is rotatably sleeved on the outer side of the outer wall of the rotating cylinder 42 through a bearing, the front side of the mounting seat 44 is arranged on the front side of the inner cavity of the first outer box 47, the first bevel gear 45 is sleeved on the middle part of the outer wall of the rotating cylinder 42 and locked by a top screw, the number of driving columns 46 is several, and the several driving columns 46 are respectively arranged on the outer wall bottom of the first rotating rod 41 at equal distances along the circumferential direction, when the first rotating rod 41 rotates, the cooperation between the driving column 46 and the driving groove 415 can drive the linkage cylinder 414 to rotate, and the linkage cylinder 414 can be slidably sleeved on the outer wall bottom of the first rotating rod 41,The linkage cylinder 414 is located between the two rotating cylinders 42. The outer wall of the linkage cylinder 414 is provided with a plurality of driving grooves 415 equidistantly along the circumference from top to bottom. The driving column 46 can be slidably adapted and inserted into the bottom end of the inner cavity of the driving groove 415 corresponding to its position. The top end of the linkage cylinder 414 contacts the bottom end of the rotating cylinder 42 located above. The linkage cylinder 414 can be used to drive the rotating cylinder 42 to rotate. The length of the inner cavity of the driving groove 415 is greater than the distance from the bottom end of the linkage cylinder 414 to the top end of the rotating cylinder 42 located below, so as to ensure that the linkage cylinder 414 can contact both rotating cylinders 42. There are a plurality of second calipers 416, which are equidistantly arranged at the upper and lower ends of the linkage cylinder 414 along the circumferential direction. The second calipers 416 and The first caliper 43 matches, the second caliper 416 located at the top of the linkage cylinder 414 is plugged into the first caliper 43 located at the bottom of the upper rotating cylinder 42, and the cooperation between the second caliper 416 and the first caliper 43 can cause the linkage cylinder 414 to drive the rotating cylinder 42 to rotate. There are two limit rods 428, and the upper and lower ends of the two limit rods 428 are respectively arranged on the upper and lower ends and left and right sides of the front side of the inner cavity of the first outer box 47. The limit rods 428 are used to support the moving seat 417. The upper and lower ends of the moving seat 417 are rotatably connected to the upper and lower sides of the outer wall of the linkage cylinder 414 through bearings, and the left and right ends of the front side of the moving seat 417 are respectively slidably connected to the top of the outer wall of the two limit rods 428. The moving seat 417 is used Drive the linkage cylinder 414 to move, the sliding column 418 is arranged in the middle of the front side of the moving seat 417, the outer wall of the sliding column 418 can be slidably adapted to be inserted into the top of the inner cavity of the moving groove 48, the front end of the sliding column 418 extends out of the inner cavity of the moving groove 48, the number of the connecting rod 419 is two, one end of the two connecting rods 419 is rotatably arranged on the left and right sides of the outer wall of the sliding column 418 through a pin shaft, the middle part of the outer wall of the first connecting rod 420 is rotatably arranged on the other end of the connecting rod 419 through a bearing, the first sliding block 421 can be slidably adapted to be inserted into the inner side of the inner cavity of the first sliding groove 49, the first sliding block 421 can be slidably sleeved on the inner side of the outer wall of the first guide rod 411, the front end of the first connecting rod 420 is arranged on the rear side of the first sliding block 421, the first connecting rod 420 is arranged on the rear side of the first sliding block 421, A spring 412 is embedded in the inner cavity of the first slide groove 49, the first spring 412 is sleeved on the outer wall of the first guide rod 411, one end of the first spring 412 is clamped on the inner wall of the first slide groove 49, and the other end of the first spring 412 is clamped on the outer wall of the first slider 421. The first spring 412 is a rotation spring, which undergoes elastic deformation after being squeezed or stretched by external force, and returns to its initial state after the external force is removed. The first spring 412 is used here to support and push the first slider 421, so as to fix the position of the linkage cylinder 414. The middle part of the outer wall of the second rotating rod 423 is rotatably arranged in the middle part of the rear side of the inner cavity of the first outer box 47 through a bearing, and the second bevel gear 424 is sleeved on the front side of the outer wall of the second rotating rod 423 and locked by a top screw.The second bevel gear 424 and the two first bevel gears 45 are meshed with each other, and the front end of the universal joint 425 is arranged at the rear end of the second rotating rod 423. The universal joint 425 is a prior art and will not be described in detail here. The universal joint 425 is used to cause the second rotating rod 423 to drive the third rotating rod 426 to rotate. The top end of the third rotating rod 426 is arranged at the rear end of the universal joint 425. The bidirectional saw blade 6 is detachably sleeved on the bottom end of the outer wall of the third rotating rod 426. The third rotating rod 426 is used to drive the bidirectional saw blade 6 to rotate. The top end of the guard plate 427 is arranged on the rear side of the first outer box 47. The second rotating rod 423, the universal joint 425 and the third rotating rod 426 are all located in the inner cavity of the guard plate 427, and there is a gap between them and the inner wall of the guard plate 427. The bidirectional saw blade 6 is located in the inner cavity of the guard plate 427.

[0020] As a preferred embodiment, further, the emergency brake mechanism 5 includes: a second outer box 51, a third slide groove 52, a third guide rod 53, a first pulley 54, a second connecting rod 55, a gear 56, a second slider 57, a pull block 58, a rack 59, a ring 510, a slot 511, a second handle 512, an extrusion groove 513, a second spring 514, a card ball 515, a pull plate 516, a pull groove 517, a second pulley 518 and a pull rope 519. The second outer box 51 is sleeved on the top of the outer wall of the sleeve 2, and the third slide groove 52 is opened on the front side of the inner cavity of the second outer box 51 in the up and down direction. The upper and lower ends of the third guide rod 53 are respectively arranged on the upper and lower sides of the inner cavity of the third slide groove 52. The third guide rod 53 is used to limit the pull block 58. The second connecting rod 5 The rear end of the second connecting rod 55 is rotatably arranged in the middle of the rear side of the inner cavity of the second outer box 51 through a bearing, the front end of the second connecting rod 55 is rotatably extended out of the front side of the second outer box 51, the gear 56 is sleeved on the rear part of the outer wall of the second connecting rod 55 and locked by a top screw, the second slider 57 is slidably adapted and inserted in the middle of the inner cavity of the third slide groove 52, the second slider 57 is slidably sleeved on the middle of the outer wall of the third guide rod 53, the middle of the front side of the pull block 58 is arranged on the rear side of the second slider 57, the pull block 58 is used to pull the pull rope 519, the bottom end of the rack 59 is arranged at the top end of the pull block 58, the rack 59 and the gear 56 are meshed, the ring 510 is arranged in the middle of the front side of the second outer box 51, the front end of the second connecting rod 55 is located in the inner cavity of the ring 510, the ring The inner wall of 510 is provided with a plurality of slots 511 equidistantly along the circumferential direction, the rear end of the second handle 512 is arranged at the front end of the second connecting rod 55, the second handle 512 is rotatably adapted to be inserted into the inner cavity of the sleeve ring 510, the rear side of the outer wall of the second handle 512 is provided with a plurality of extrusion slots 513 equidistantly along the circumferential direction, the second spring 514 is embedded in the inner cavity of the extrusion slot 513, one end of the second spring 514 is clamped to the inner wall of the extrusion slot 513, the second spring 514 is a rotation spring, which undergoes elastic deformation after being squeezed or stretched by external force, and returns to its initial state after the external force is removed, the second spring 514 is used here to squeeze and push the card ball 515 into the inner cavity of the card slot 511, a part of the card ball 515 is embedded in the inner cavity of the extrusion slot 513, the card ball 51 The other part of 5 extends into the inner cavity of the card slot 511 corresponding to its position, and the other end of the second spring 514 is clamped on the outer wall of the card ball 515. There are two pull plates 516. The upper and lower ends of the front sides of the two pull plates 516 can be slidably adapted and inserted into the inner side of the inner cavity of the four second slide grooves 410 respectively. The front side of the pull plate 516 is provided with a pull groove 517 that penetrates front and back along the left and right directions. The rear side of the outer wall of the first connecting rod 420 can be slidably adapted and inserted into the inner side of the inner cavity of the pull groove 517. The pull plate 516 is used to pull the first connecting rod 420 to drive the first slider 421 to move outward. There are two first pulleys 54, which are respectively arranged on the left and right sides of the second outer box 51. There are two second pulleys 518.The two second pulleys 518 are respectively arranged on the left and right sides of the first outer box 47, and the number of the pull ropes 519 is two. One end of the two pull ropes 519 is respectively arranged on the outside of the two pull plates 516. The two pull ropes 519 extend out of the inner cavity of the first outer box 47 through the inner cavity of the two telescopic grooves 422, and overlap the outer walls of the two first pulleys 54 and the two second pulleys 518. The two pull ropes 519 extend into the inner cavity of the second outer box 51 through the left and right sides of the second outer box 51 and can slide. The other ends of the two pull ropes 519 are respectively arranged on the left and right sides of the pull block 58. The pull ropes 519 are used to pull the pull plate 516 to move.

[0021] A cultivation device and method for protecting forest and grass resources, specifically comprising the following steps: Step 1: When in use, hold the first handle 3 with one hand and the second handle 512 with the other hand, start the diesel engine 1, and use the output end of the diesel engine 1 to drive the first rotating rod 41 to rotate. The rotation of the first rotating rod 41 drives the linkage cylinder 414 to rotate through the cooperation between the driving column 46 and the driving slot 415, and the cooperation between the first caliper 43 and the second caliper 416 drives the linkage cylinder 414 to drive the rotating cylinder 42 located above to rotate, so that the rotating cylinder 42 located above drives the first bevel gear 45 on its outer wall to rotate, and the cooperation between the first bevel gear 45 and the second bevel gear 424 drives the second rotating rod 423 to drive the third rotating rod 426 to rotate through the universal joint 425, so that the third rotating rod 426 drives the bidirectional saw blade 6 to rotate, and the hand holding the first handle 3 applies force, so as to use the rotating bidirectional saw blade 6 to perform shrubs; Step 2. When it is necessary to change the rotation direction of the bidirectional saw blade 6 and thus change the direction of the shrub, turn off the diesel engine 1, pull the sliding post 418 to slide downward along the inner cavity of the moving groove 48, so that the sliding post 418 drives the moving seat 417 to move downward, and the moving seat 417 drives the linkage cylinder 414 to slide downward along the outer wall of the first rotating rod 41, and the linkage cylinder 414 slides downward along the outer wall of the first rotating rod 41 to prompt the driving post 46 to slide along the inner cavity of the driving groove 415, and the sliding post 418 slides downward to push the connecting rod 419 to drive the first sliding block 421 to move outward along the inner cavity of the first sliding groove 49, and squeeze the first spring 412 to cause elastic deformation, and at the same time, use the first sliding block 421 to drive the first connecting rod 420 to move outward along the inner cavity of the pulling groove 517 until the connecting rod 419 and the first sliding groove 49 are in the same straight line, and continue to pull the sliding post 418 downward to use the sliding post 418 to pull the connecting rod 419 to drive the first sliding block 421 to move outward along the inner cavity of the first sliding groove 49. A slider 421 moves inward and causes the first spring 412 to gradually return to its initial state until the first slider 421 returns to its initial position and the first spring 412 returns to its urged state. At this time, the bottom end of the linkage cylinder 414 contacts the top end of the rotating cylinder 42 located below, and the second caliper 416 located at the bottom end of the linkage cylinder 414 is plugged into the first caliper 43 located at the top end of the rotating cylinder 42 located below. At this time, the diesel engine 1 is started, and the linkage cylinder 414 is driven to rotate by the first rotating rod 41 and the driving column 46. The rotation of the linkage cylinder 414 drives the rotating cylinder 42 located below and the first bevel gear 45 on its outer wall to rotate by the cooperation between the first caliper 43 and the second caliper 416. The cooperation between the first bevel gear 45 and the second bevel gear 424 located below is used to cause the second rotating rod 423 to move in the opposite direction to the above, thereby causing the bidirectional saw blade 6 to move in the opposite direction to the above, thereby changing the direction of the shrub. Step 3. When an error occurs and the saw is operated in the direction opposite to the rotation of the saw teeth, the centrifugal force generated by the rotation of the blade will form a thrust, which makes it very easy for the bidirectional saw blade 6 to break away from the bush and move quickly in the direction of the thrust. At this time, the bidirectional saw blade 6 will be prompted to rotate quickly with the second handle 512 as the center of the circle. At the same time, since the operator holds the second handle 512, the second handle 512 will drive the second connecting rod 55 to rotate. The rotation of the second handle 512 uses the inner wall of the card slot 511 to squeeze the card ball 515 to move toward the inner cavity of the squeezing slot 513, and squeeze the second spring 514 to cause elastic deformation until the card ball 515 is completely separated from the inner cavity of the card slot 511. The rotation of the second connecting rod 55 drives the gear 56 to rotate, and the rotation of the gear 56 cooperates with the rack 59 Pull the pull block 58 upward or push the pull block 58 downward, so that the pull block 58 is used to pull the pull plate 516 outward through the pull rope 519, and then the pull groove 517 is used to pull the first connecting rod 420 outward, and the first connecting rod 420 moves outward to pull the first slider 421 to drive the outer end of the connecting rod 419 to move outward, so that the connecting rod 419 pulls the sliding column 418 to drive the moving seat 417 and the linkage cylinder 414 to move upward or downward, thereby prompting the linkage cylinder 414 and the rotating cylinder 42 to separate, and then prompting the first bevel gear 45 to stop rotating, thereby prompting the second bevel gear 424 to stop driving the second rotating rod 423 to rotate, prompting the bidirectional saw blade 6 to stop rotating, and preventing the bidirectional saw blade 6 from causing accidental injury when it moves rapidly in the direction of the thrust.

[0022] To sum up, when the device is operating in narrow bushes or close to obstacles, the operator can easily switch the cutting angle and optimize the working efficiency. At the same time, the saw blade can automatically stop rotating in the event of a reverse operation error, effectively preventing safety hazards such as accidental injuries caused by improper operation, and providing safer and more efficient tool support for the protection and cultivation of forest and grass resources.

[0023] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A cultivation device for protecting forest and grass resources, characterized in that: include: Diesel engine (1); A sleeve (2), the sleeve (2) being arranged at the bottom end of the diesel engine (1), and the output end of the diesel engine (1) being rotatably plugged into the inner cavity of the sleeve (2); A first handle (3), the first handle (3) being arranged on the top of the outer wall of the sleeve (2); A steering switching mechanism (4), wherein the steering switching mechanism (4) is arranged at the bottom end of the sleeve (2); An emergency braking mechanism (5), wherein the emergency braking mechanism (5) is arranged on the top of the outer wall of the sleeve (2); A bidirectional saw blade (6), wherein the bidirectional saw blade (6) is arranged at the bottom end of the steering switching mechanism (4); The steering switching mechanism (4) comprises: a first rotating rod (41), the top end of the first rotating rod (41) being locked to the output end of the diesel engine (1) via a coupling, the first rotating rod (41) being rotatably inserted into the inner cavity of the sleeve (2), and the bottom end of the first rotating rod (41) being rotatably extended out of the inner cavity of the sleeve (2); A first outer box (47), wherein the top end of the first outer box (47) is arranged at the bottom end of the first sleeve (2), the top end of the inner cavity of the first outer box (47) is rotatably sleeved on the bottom end of the outer wall of the first rotating rod (41) through a bearing, the bottom end of the first rotating rod (41) is rotatably arranged on the bottom end of the inner cavity of the first outer box (47) through a bearing, a movable groove (48) connected to the inner cavity of the first outer box (47) is opened in the middle of the front side along the up-down direction, first sliding grooves (49) are opened in the middle of the front side of the inner cavity of the first outer box (47) at both ends along the left-right direction, two second sliding grooves (410) are opened in the middle of the front side of the inner cavity of the first outer box (47) at both ends along the left-right direction, the four second sliding grooves (410) are divided into upper and lower sides located at the two first sliding grooves (49), and the left and right sides of the first outer box (47) are opened with telescopic grooves (422) connected to the inner cavity; A first guide rod (411), the left and right ends of the first guide rod (411) being respectively arranged on the left and right sides of the inner cavity of the first slide groove (49); A second guide rod (413), the left and right ends of the second guide rod (413) being respectively arranged on the left and right sides of the inner cavity of the second slide groove (410); A rotating drum (42), wherein the number of the rotating drums (42) is two, and the two rotating drums (42) are rotatably sleeved on the bottom of the outer wall of the first rotating rod (41) via a bearing, and there is a gap between the two rotating drums (42); A first caliper (43), wherein the number of the first calipers (43) is multiple, and the multiple first calipers (43) are respectively arranged at equal intervals along the circumferential direction on the inner sides of the two rotating drums (42); A mounting seat (44), the mounting seat (44) being rotatably sleeved on the outer side of the outer wall of the rotating drum (42) via a bearing, and the front side of the mounting seat (44) being arranged on the front side of the inner cavity of the first outer box (47); A first bevel gear (45), wherein the first bevel gear (45) is sleeved on the middle portion of the outer wall of the rotating drum (42) and is locked by a top screw.

2. A cultivation device for protecting forest and grass resources according to claim 1, characterized in that: The steering switching mechanism (4) further comprises: A driving column (46), wherein the number of the driving columns (46) is a plurality, and the plurality of driving columns (46) are respectively arranged at equal intervals along the circumferential direction at the bottom of the outer wall of the first rotating rod (41); A linkage cylinder (414), the linkage cylinder (414) can be slidably sleeved on the bottom of the outer wall of the first rotating rod (41), the linkage cylinder (414) is located between the two rotating cylinders (42), the outer wall of the linkage cylinder (414) is provided with a plurality of driving grooves (415) equidistantly along the circumference from top to bottom, the driving column (46) can be slidably adapted and inserted into the bottom end of the inner cavity of the driving groove (415) corresponding to its position, and the top end of the linkage cylinder (414) is in contact with the bottom end of the rotating cylinder (42) located above; A second caliper (416), wherein the number of the second calipers (416) is plural, and the plurality of second calipers (416) are equidistantly arranged at the upper and lower ends of the linkage cylinder (414) along the circumferential direction, the second caliper (416) matches the first caliper (43), and the second caliper (416) located at the top end of the linkage cylinder (414) is plugged into the first caliper (43) located at the bottom end of the rotating cylinder (42) above.

3. A cultivation device for protecting forest and grass resources according to claim 2, characterized in that: The steering switching mechanism (4) further comprises: Limit rods (428), the number of the limit rods (428) being two, and the upper and lower ends of the two limit rods (428) being respectively arranged at the upper and lower ends and the left and right sides of the front side of the inner cavity of the first outer box (47); A movable seat (417), wherein upper and lower ends of the movable seat (417) are rotatably sleeved on upper and lower sides of the outer wall of the linkage cylinder (414) through bearings, and left and right ends of the front side of the movable seat (417) are slidably sleeved on the top ends of the outer walls of the two limit rods (428); A sliding column (418), wherein the sliding column (418) is disposed in the middle of the front side of the movable seat (417), the outer wall of the sliding column (418) can be slidably adapted to be inserted into the top end of the inner cavity of the movable groove (48), and the front end of the sliding column (418) extends out of the inner cavity of the movable groove (48); Connecting rods (419), the number of the connecting rods (419) is two, and one end of the two connecting rods (419) is rotatably disposed on the left and right sides of the outer wall of the sliding column (418) through a pin shaft; A first connecting rod (420), wherein a middle portion of an outer wall of the first connecting rod (420) is rotatably disposed on the other end of the connecting rod (419) via a bearing; A first sliding block (421), the first sliding block (421) can be slidably adapted to be inserted into the inner side of the inner cavity of the first sliding groove (49), the first sliding block (421) can be slidably sleeved on the inner side of the outer wall of the first guide rod (411), and the front end of the first connecting rod (420) is arranged on the rear side of the first sliding block (421); A first spring (412), wherein the first spring (412) is embedded in the inner cavity of the first slide groove (49), the first spring (412) is sleeved on the outer wall of the first guide rod (411), one end of the first spring (412) is clamped on the inner wall of the first slide groove (49), and the other end of the first spring (412) is clamped on the outer wall of the first slide block (421).

4. A cultivation device for protecting forest and grass resources according to claim 3, characterized in that: The steering switching mechanism (4) further comprises: A second rotating rod (423), the middle portion of the outer wall of the second rotating rod (423) being rotatably arranged at the middle portion of the rear side of the inner cavity of the first outer box (47) via a bearing; a second bevel gear (424), wherein the second bevel gear (424) is sleeved on the front side of the outer wall of the second rotating rod (423) and is locked by means of a top screw, and the second bevel gear (424) and the two first bevel gears (45) are meshed with each other; A universal joint (425), wherein the front end of the universal joint (425) is arranged at the rear end of the second rotating rod (423); a third rotating rod (426), the top end of the third rotating rod (426) being arranged at the rear end of the universal joint (425), and the bidirectional saw blade (6) being detachably sleeved on the bottom end of the outer wall of the third rotating rod (426); A guard plate (427), the top end of the guard plate (427) is arranged on the rear side of the first outer box (47), the second rotating rod (423), the universal joint (425) and the third rotating rod (426) are all located in the inner cavity of the guard plate (427), and there is a gap between them and the inner wall of the guard plate (427), and the bidirectional saw blade (6) is located in the inner cavity of the guard plate (427).

5. A cultivation device for protecting forest and grass resources according to claim 4, characterized in that: The length of the inner cavity of the driving groove (415) is greater than the distance between the bottom end of the linkage cylinder (414) and the top end of the rotating cylinder (42) located below.

6. A cultivation device for protecting forest and grass resources according to claim 5, characterized in that: The emergency brake mechanism (5) comprises: A second outer box (51), the second outer box (51) being sleeved on the top of the outer wall of the sleeve (2), and a third slide groove (52) being provided on the front side of the inner cavity of the second outer box (51) in the up-down direction; A third guide rod (53), wherein upper and lower ends of the third guide rod (53) are respectively arranged at upper and lower sides of the inner cavity of the third slide groove (52); a second connecting rod (55), the rear end of the second connecting rod (55) being rotatably disposed in the middle of the rear side of the inner cavity of the second outer box (51) via a bearing, and the front end of the second connecting rod (55) being rotatably extended out of the front side of the second outer box (51); A gear (56), wherein the gear (56) is sleeved on the rear portion of the outer wall of the second connecting rod (55) and is locked by a top screw; A second sliding block (57), the second sliding block (57) being slidably adapted to be inserted into the middle of the inner cavity of the third sliding groove (52), and the second sliding block (57) being slidably sleeved on the middle of the outer wall of the third guide rod (53); A pull block (58), wherein the middle portion of the front side of the pull block (58) is arranged on the rear side of the second sliding block (57); A rack (59), wherein the bottom end of the rack (59) is arranged at the top end of the pull block (58), and the rack (59) is meshed with the gear (56); A collar (510), the collar (510) being arranged at the middle of the front side of the second outer box (51), the front end of the second connecting rod (55) being located in the inner cavity of the collar (510), and the inner wall of the collar (510) being provided with a plurality of slots (511) equidistantly arranged along the circumferential direction; A second handle (512), the rear end of the second handle (512) being arranged at the front end of the second connecting rod (55), the second handle (512) being rotatably adapted to be inserted into the inner cavity of the sleeve ring (510), and a plurality of extrusion grooves (513) being equidistantly formed on the rear side of the outer wall of the second handle (512) along the circumferential direction; a second spring (514), wherein the second spring (514) is embedded in the inner cavity of the extrusion groove (513), and one end of the second spring (514) is clamped on the inner wall of the extrusion groove (513); A locking ball (515), a portion of which is embedded in the inner cavity of the extrusion groove (513), another portion of which extends into the inner cavity of the locking groove (511) corresponding to its position, and the other end of the second spring (514) is locked to the outer wall of the locking ball (515).

7. The cultivation device for protecting forest and grass resources according to claim 6, characterized in that: The emergency brake mechanism (5) further comprises: A pull plate (516), wherein the number of the pull plates (516) is two, and the upper and lower ends of the front sides of the two pull plates (516) are respectively slidably adapted to be inserted into the inner sides of the inner cavities of the four second slide grooves (410), and a pull groove (517) penetrating front and rear is opened on the front side of the pull plate (516) in the left-right direction, and the rear side of the outer wall of the first connecting rod (420) is slidably adapted to be inserted into the inner side of the inner cavity of the pull groove (517); A first pulley (54), wherein the number of the first pulleys (54) is two, and the two first pulleys (54) are respectively arranged on the left and right sides of the second outer box (51); A second pulley (518), wherein the number of the second pulleys (518) is two, and the two second pulleys (518) are respectively arranged on the left and right sides of the first outer box (47); A pull rope (519), wherein the number of the pull ropes (519) is two, one end of the two pull ropes (519) is respectively arranged on the outside of the two pull plates (516), the two pull ropes (519) respectively extend out of the inner cavity of the first outer box (47) through the inner cavity of the two telescopic grooves (422), and overlap the outer walls of the two first pulleys (54) and the two second pulleys (518), the two pull ropes (519) respectively extend into the inner cavity of the second outer box (51) through the left and right sides of the second outer box (51) slidably, and the other ends of the two pull ropes (519) are respectively arranged on the left and right sides of the pull block (58).

8. A cultivation method for protecting forest and grass resources, which is applied to a cultivation device for protecting forest and grass resources as claimed in claim 7, specifically comprising the following steps: Step 1: When using, one hand holds the first handle (3) and the other hand holds the second handle (512), the diesel engine (1) is started, and the output end of the diesel engine (1) is used to drive the first rotating rod (41) to rotate. The first rotating rod (41) rotates to drive the linkage cylinder (414) to rotate through the cooperation between the driving column (46) and the driving groove (415). The cooperation between the first caliper (43) and the second caliper (416) drives the linkage cylinder (414) to drive the rotating cylinder (42) located above. The rotating cylinder (42) is rotated, thereby using the rotating cylinder (42) located above to drive the first bevel gear (45) on the outer wall thereof to rotate, and using the cooperation between the first bevel gear (45) and the second bevel gear (424) to cause the second rotating rod (423) to drive the third rotating rod (426) to rotate through the universal joint (425), thereby using the third rotating rod (426) to drive the bidirectional saw blade (6) to rotate, and applying force by the hand holding the first handle (3), thereby using the rotating bidirectional saw blade (6) to cut bushes; Step 2: When it is necessary to change the rotation direction of the bidirectional saw blade (6) and thus change the direction of the bushes, the diesel engine (1) is turned off, and the sliding column (418) is pulled to slide downward along the inner cavity of the moving groove (48), so that the sliding column (418) drives the moving seat (417) to move downward, and the moving seat (417) drives the linkage cylinder (414) to slide downward along the outer wall of the first rotating rod (41), and the linkage cylinder (414) slides downward along the outer wall of the first rotating rod (41), so that the driving column (46) moves along the inner cavity of the driving groove (415). The sliding column (418) slides downward to push the connecting rod (419) to drive the first slider (421) to move outward along the inner cavity of the first slide groove (49) and squeeze the first spring (412) to cause elastic deformation. At the same time, the first slider (421) drives the first connecting rod (420) to move outward along the inner cavity of the pull groove (517) until the connecting rod (419) and the first slide groove (49) are in the same straight line. The sliding column (418) is continuously pulled downward to pull the connecting rod (419) by the sliding column (418). The first slider (421) is driven to move inward, and the first spring (412) is urged to gradually return to its initial state, until the first slider (421) returns to its initial position and the first spring (412) returns to its urged state. At this time, the bottom end of the linkage cylinder (414) contacts the top end of the rotating cylinder (42) located below, and the second caliper (416) located at the bottom end of the linkage cylinder (414) is plugged into the first caliper (43) located at the top end of the rotating cylinder (42) below. At this time, the diesel engine (1) is started, and the first rotating rod (4 1) and the driving column (46) drive the linkage cylinder (414) to rotate, the linkage cylinder (414) rotates to drive the rotating cylinder (42) located below and the first bevel gear (45) on the outer wall thereof to rotate by utilizing the cooperation between the first caliper (43) and the second caliper (416), and the cooperation between the first bevel gear (45) and the second bevel gear (424) located below causes the second rotating rod (423) to move in the opposite direction to the above, thereby causing the bidirectional saw blade (6) to move in the opposite direction to the above, thereby changing the direction of the shrub; Step 3: When an erroneous operation occurs and the bush is operated in the direction opposite to the rotation direction of the saw teeth, the centrifugal force generated by the rotation of the blade will form a thrust, which makes it very easy for the bidirectional saw blade (6) to detach from the bush and move rapidly in the direction of the thrust. At this time, the bidirectional saw blade (6) will be prompted to rotate rapidly with the second handle (512) as the center of the circle. At the same time, because the operator holds the second handle (512), the second handle (512) will drive the second connecting rod (55) to rotate. The second handle (512) rotates and uses the inner wall of the slot (511) to squeeze the card ball (515) to move toward the inner cavity of the squeezing slot (513), and squeezes the second spring (514) to cause elastic deformation until the card ball (515) is completely detached from the inner cavity of the slot (511). The second connecting rod (55) rotates and drives the gear (56) to rotate. The gear (56) rotates and cooperates with the rack (59) to pull the pull block (58) moves upward or pushes the pull block (58) to move downward, thereby using the pull block (58) to pull the pull plate (516) outward through the pull rope (519), and then using the pull groove (517) to pull the first connecting rod (420) outward, the first connecting rod (420) moves outward to pull the first slider (421) to drive the outer end of the connecting rod (419) to move outward, thereby using the connecting rod (419) to pull the sliding column (418) to drive the moving seat (417) and the linkage cylinder (414) to move upward or downward, thereby causing the linkage cylinder (414) and the rotating cylinder (42) to separate, and then causing the first bevel gear (45) to stop rotating, thereby causing the second bevel gear (424) to stop driving the second rotating rod (423) to rotate, causing the bidirectional saw blade (6) to stop rotating, and preventing the bidirectional saw blade (6) from causing accidental injury when it moves rapidly in the direction of the thrust.

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