Passive tree-avoiding weeding device

Abstract

A passive tree-avoiding weeding device is towed forward by a towing device and includes: an extension arm, a power system, an avoidance disc, and claw knives. The avoidance disc is arranged at the lower part of one end of the extension arm. The avoidance disc includes a disc body and a one-way clutch. The one-way clutch includes an inner ring, an outer ring, and a wedge block. When the inner ring is fixed, the outer ring can only rotate in one direction. If the outer ring rotates in the reverse direction, the wedge block locks to prevent the outer ring from rotating in the reverse direction. The inner ring is fixedly connected to the extension arm, and the outer ring is fixedly connected to the disc body. The disc body rotates unidirectionally relative to the inner ring. The claw knives are arranged at the lower part of the disc body. The power system drives the claw knives to rotate, realizing passive avoidance of fruit trees, approaching the fruit trees to the greatest extent while not damaging the fruit trees, and removing the weeds near the fruit trees.

Description

Technical Field:

[0001] The present invention relates to the technical field of weeders, and particularly to a passive tree-avoiding weeding device. Background Art:

[0002] The common ways of weeding include chemical agent weeding, manual weeding and mechanical weeding. Among them, chemical agent weeding will have an adverse impact on the soil and also have a certain inhibitory effect on the growth of crops; manual weeding consumes a huge amount of manpower and has low efficiency, and is not suitable for weeding in large-scale plantations; mechanical weeding can avoid the defects of the above two methods, so it has been rapidly developed and widely applied in agricultural planting.

[0003] However, there are also problems with current mechanical weeding. Currently, the active avoidance method is mostly used. For example, a horizontally extended touch rod is set. When the touch feels an obstacle, it is judged that a fruit tree is encountered, and then it automatically avoids. This active avoidance method makes the weeding machine have a distance as far as the touch rod from the fruit tree, so that the weeds around the fruit tree cannot be removed. On the other hand, the touch rod cannot identify the prostrate or horizontally growing grape branches, because the touch rod will not be blocked but will pass through along the way, thus not triggering avoidance, and the weeding machine will directly cut this part of the grape branches, causing damage to the fruit tree. In summary, the active avoidance weeding machine has poor weeding effect in actual orchards, especially in vineyards. It not only fails to remove weeds completely but also damages the fruit trees. Summary of the Invention:

[0004] In view of this, it is necessary to design a passive tree-avoiding weeding device to achieve passive avoidance of fruit trees, be able to approach the fruit trees as closely as possible without damaging the fruit trees, remove the weeds near the fruit trees, and stop when it is impossible to pass from below when encountering horizontally growing or prostrate grape branches, so as to protect the grape branches to the greatest extent.

[0005] A passive tree-avoiding weeding device is towed forward by a towing device and includes: a telescopic arm, a power system, an avoidance disc, and claw knives. The avoidance disc is arranged at the lower part of one end of the telescopic arm. The avoidance disc includes a disc body and a one-way clutch. The one-way clutch includes an inner ring, an outer ring, and wedges. When the inner ring is fixed, the outer ring can only rotate in one direction. If the outer ring rotates in the reverse direction, the wedges will lock to prevent the outer ring from rotating in the reverse direction. The inner ring is fixedly connected to the telescopic arm, the outer ring is fixedly connected to the disc body, the disc body rotates unidirectionally relative to the inner ring, the claw knives are arranged at the lower part of the disc body, and the power system drives the claw knives to rotate.

[0006] The inner ring of the one-way clutch is fixed to the extending arm. When the fruit tree is on the right side of the advancing direction of the traction device, the outer ring is allowed to drive the disc body to rotate clockwise, and the wedge block does not lock; when the disc body rotates counterclockwise, the wedge block locks. When the disc body moves forward and encounters an obstacle, it will rotate clockwise along the obstacle, thus passively avoiding the obstacle. During the weeding process, when encountering a fruit tree, the disc body will passively avoid it and rotate clockwise along the fruit tree, removing the weeds around the fruit tree without damaging the fruit tree. Since the advancing speed of the traction device is not fast, the disc body's touch on the fruit tree to this extent will not damage the outer skin of the fruit tree. When encountering the situation where grape branches grow horizontally, if the weeding machine can pass through, it will not touch the grape branches. If the horizontally growing grape branches block the weeding machine working close to the ground and passive avoidance cannot be achieved, the weeding machine will issue an alarm or pause, without causing harm to the grape tree, and it has an excellent effect in vineyards. The rotation of the disc body is independent of the rotation of the claw knife driven by the power system, and the two rotate independently of each other without interference. When the fruit tree is on the left side of the advancing direction of the traction device, the rotation direction of the one-way clutch is adjusted to allow the disc body to rotate counterclockwise. When the disc body rotates clockwise, the wedge block locks.

[0007] Preferably, the outer edge of the disc body is circular, oval or a rounded polygon with each side being arcuately recessed towards the center of the disc body.

[0008] When the outer edge of the disc body is circular or oval, in order to facilitate the disc body to rotate and avoid along the tree trunk, the disc body can be bent downwards with a rounded corner to extend out the side surface, and some protrusions or patterns made of elastic materials are arranged on the side surface to increase the friction force and facilitate the disc body to rotate along the fruit tree. Best of all, when the disc body is set as a rounded polygon with each side being arcuately recessed towards the center of the disc body, such as in the shape of a triangle or a quadrilateral, the disc body corresponds to a rounded triangle with all three sides being recessed inward, or a rounded quadrilateral with all four sides being recessed inward. The recessed part can accommodate the fruit tree trunk. In this way, when the avoidance disc moves forward, the rounded part protruding from the disc body touches the tree trunk, and it will rotate passively, while the recessed part can just accommodate and rotate around the fruit tree, so as to remove the weeds around the fruit tree. This passive tree avoidance method does not require redundant buffer devices, and the disc body only needs to move straight forward without the need to avoid in the left and right directions.

[0009] Preferably, the claw knife includes a knife holder and at least two claws. The knife holder is a plane, and the claws extending from the knife holder to the ground are evenly arranged on one side of the knife holder and fixedly connected to the knife holder. The other side of the knife holder is fixedly connected to the power system.

[0010] The claw knife is inserted into the soil for weeding. The rotating claw knife is inserted into the soil, rotates and pulls out to damage the roots of the weeds, preventing the weeds from reviving, weeding more thoroughly, and can also loosen the soil. It has been used in vineyards for a long time and has a particularly good effect. Moreover, this method of weeding close to the ground will not cause harm to the fallen grape branches.

[0011] Preferably, one end of the claw is perpendicularly fixed to the tool rest, and the other end extends in the opposite direction for a certain distance and then bends and extends towards the center of the tool rest. The two sides of the claw are sharpened.

[0012] The claw is strong and durable, and its two sides are sharpened, making the damage to weeds more severe when rotating, preventing weeds from reviving. The extension of the claw towards the center of the tool rest can play a role in flipping and cutting, achieving a better weeding effect.

[0013] Preferably, the avoidance disk further includes a chassis. The power system includes a main shaft, a main gear, and at least three secondary gears. The secondary gears are evenly arranged around the main gear and mesh with the main gear. The main gear and the secondary gears are arranged between the disk body and the chassis. The main shaft passes through the disk body via the inner ring and is fixedly connected to the main gear. After passing through the main gear, the main shaft is connected to the chassis by a bearing. The main shaft does not contact the inner ring. One end of the central axis of the secondary gear is connected to the disk body by a bearing, and the other end is connected to the chassis by a bearing and extends out of the chassis. The end of the central axis of the secondary gear extending out of the chassis is fixedly connected to the claw knife. The main shaft drives the main gear to rotate, the main gear drives the secondary gears to rotate, and the secondary gears drive the claw knife to rotate; the shape of the chassis matches the shape of the disk body, both being rounded polygons with each side being arcuately recessed towards the center of the disk body. The secondary gears are arranged at the rounded corners of the polygon, and the sides between the secondary gears are arcuately recessed towards the center of the disk body.

[0014] The power system uses a gear transmission method to drive at least three claw knives to rotate. This method will not cause the wire to be twisted due to the rotation of the disk body, and has a simple structure, low cost, sufficient power, and is convenient for popularization. Preferably, there are three secondary gears arranged in a triangle. The outer edge of the disk body corresponds to a rounded triangle with all three sides being recessed inward. The non-contact between the main shaft and the inner ring enables the rotation of the disk body to be independent of the rotation of the claw knife, and the two can rotate independently of each other without interference. When the fruit tree is on the right side of the advancing direction of the weeding device, the main gear rotates counterclockwise, driving the secondary gears to rotate clockwise. When encountering a fruit tree, the disk body rotates clockwise, that is, the passive rotation direction of the disk body is opposite to the rotation direction of the main gear. When the disk body rotates passively, it drives the secondary gears to move along the clockwise direction of the main gear, and the recess of the disk body rotates around the fruit tree to complete the weeding work around the fruit tree.

[0015] Preferably, the power system further includes a hydraulic motor and a transmission belt. The main shaft is connected to the extension arm by a bearing. One end of the transmission belt is connected to the hydraulic motor, and the other end is connected to the main shaft. The hydraulic motor arranged on the extension arm drives the main shaft to rotate through the transmission belt.

[0016] Grape vines are generally relatively low, so the weeding machine needs to reach in for weeding. However, the hydraulic motor occupies a relatively large area and is not convenient to reach in. Therefore, a transmission belt is added, enabling the hydraulic motor to be outside the grape vines, facilitating the passive tree-avoiding weeding device to reach deep into the grape vine bushes for weeding work.

[0017] Preferably, the power system includes a side arm, a driving device, a main belt, a driven belt, a belt pulley, a fixed shaft, and at least three driven wheels. One end of the side arm is fixedly connected to the extending arm, and the other end is provided with the driving device. The side arm and the extending arm form a Y shape. The belt pulley is sleeved on the fixed shaft through a bearing. One end of the fixed shaft is fixedly connected to the extending arm, and the other end is fixedly connected to the inner ring. The driven wheels arranged on the disk body are evenly arranged around the belt pulley, and a certain distance is provided between the driven wheels and the belt pulley. The central axis of the driven wheel passes through the disk body and is fixedly connected to the claw knife. One end of the main belt is connected to the driving device, and the other end is connected to the belt pulley. One end of the driven belt is connected to the belt pulley, and the other end is connected to the driven wheel. The driving device drives the belt pulley to rotate in a belt drive manner, the belt pulley drives the driven wheel to rotate in a belt drive manner, and the driven wheel drives the claw knife to rotate; the disk body is a rounded polygon and each side is arc-shaped and sunken towards the center of the disk body. The driven wheels are arranged at the rounded corners of the polygon, and the sides between the driven wheels are arc-shaped and sunken towards the center of the disk body.

[0018] The power system selects the belt drive method to drive the claw knife. This method will not cause the line to twist due to the rotation of the disk body, and it has a simple structure, low cost, sufficient power, is lighter, and is convenient for popularization. There are many belt drive methods, and either friction belt drive or meshing belt drive can be selected according to the situation. Preferably, there are three driven wheels arranged in a triangle. The outer edge of the disk body corresponds to a rounded triangle and the three sides are arc-shaped and sunken towards the center of the disk body. The belt pulley is sleeved on the fixed shaft through a bearing. The fixed shaft fixes the inner ring of the one-way clutch and the extending arm, and the outer ring is fixedly connected to the disk body, so that the rotation of the disk body is independent of the rotation of the belt pulley, that is, the rotation of the disk body is independent of the rotation of the claw knife, and the two achieve independent rotation of each other without interference. When the fruit tree is on the right side of the advancing direction of the weeding device, the driving device drives the belt pulley to rotate, driving the driven wheel to rotate. When encountering a fruit tree, the disk body rotates clockwise; when the fruit tree is on the left side of the advancing direction of the weeding device, the driving device drives the belt pulley to rotate, driving the driven wheel to rotate. When encountering a fruit tree, the disk body rotates counterclockwise to complete the weeding work around the fruit tree.

[0019] Preferably, it further includes a spring, an L-shaped frame, a hydraulic telescopic rod, and a vehicle frame. The vehicle frame is connected to the traction device. The vertically upward end of the square tube-shaped L-shaped frame is sleeved in the square tube-shaped vehicle frame, and the vehicle frame and the L-shaped frame are connected through a hydraulic telescopic rod. One end of the spring arranged in the square tube of the L-shaped frame is connected to the L-shaped frame, and the other end is connected to the extending arm.

[0020] The spring enables the telescopic arm to achieve telescopic buffering between the fruit tree and the frame. When it encounters a fruit tree with a circular or oval disc body, while rotating and avoiding passively, the spring is compressed, causing the weeding machine to rotate along the fruit tree. After reaching the shortest distance between the fruit tree and the frame, the spring extends while the weeding machine rotates passively along the fruit tree, thus completing passive tree avoidance in cooperation. The hydraulic telescopic rod adjusts the distance between the claw knife and the ground, so that the claw knife always maintains an appropriate working distance from the ground, and makes vertical adjustment to the claw knife to enable the claw knife to work following the undulation of the ground.

[0021] Preferably, the angle between the telescopic arm and the moving direction of the traction device is less than 90°.

[0022] In the existing weeding devices, the telescopic arm is perpendicular to the traveling direction of the traction device. However, in this solution, the angle between the telescopic arm and the moving direction of the traction device is less than 90°. This traveling method is more labor-saving compared to the fixed method where the telescopic arm and the traveling direction of the traction device are perpendicular to each other. While saving energy, it is more convenient for the disc body to rotate and reduces the force on the fruit tree.

[0023] Preferably, the passive tree-avoiding weeding device is arranged at the side rear of the traction device, and the passive tree-avoiding weeding device and the two rear wheels of the traction device are on the same straight line.

[0024] The passive tree-avoiding weeding device and the two rear wheels of the traction device are on the same straight line. With this arrangement, the passive tree-avoiding weeding device undulates along with the rear wheels, adapting to the undulating ground faster and more quickly, especially suitable for weeding on the undulating ground.

[0025] Preferably, the avoidance disc further includes a touch rod. One end of the touch rod is fixedly connected to the side surface of the disc body, and the other end is a free end extending horizontally outwards. The touch rods are evenly fixed on the side surface of the disc body. The length of the touch rod is within 10 cm and is made of a flexible material.

[0026] When the disc body is circular or oval, a number of touch rods are arranged on the outer periphery. One end of the touch rod is fixedly connected to the side surface of the disc body, and the other end extends horizontally outwards and then bends in an arc towards the rotation direction of the disc body. When the touch rod touches the fruit tree, due to the block of the touch rod, the disc body rotates passively, realizing the function of passive tree avoidance.

[0027] When the disc body is a rounded polygon and each side is arc-shaped and sunken towards the center of the disc body, the touch rods are arranged at the sunken parts. The touch rod is a relatively short straight rod. In this way, whether it is the touch rod or the disc body that touches the fruit tree, passive avoidance can be carried out, making the weeding work closer to the fruit tree trunk more thorough.

[0028] This passive tree-avoiding weeding device can protect the fruit tree to the greatest extent while thoroughly removing the weeds near the fruit tree. On the other hand, it weeds by extending into the soil and removing weeds from the roots, avoiding incomplete weeding or regrowth from the roots, and improving the weeding efficiency. Brief Description of the Drawings:

[0029] Fig Figure 1 is a schematic diagram of a separated structure of a passive tree-avoiding weeding device in a preferred embodiment.

[0030] Fig Figure 2 is a schematic diagram of the structure of a passive tree-avoiding weeding device in a preferred embodiment.

[0031] Fig Figure 3 is a schematic diagram of the structure of a passive tree-avoiding weeding device in a preferred embodiment.

[0032] Fig Figure 4 is a top view of a part of a passive tree-avoiding weeding device in a preferred embodiment.

[0033] Fig Figure 5 is a side view of a passive tree-avoiding weeding device in a preferred embodiment.

[0034] Fig Figure 6 is a top view of a passive tree-avoiding weeding device in a preferred embodiment installed on a traction device. In the figure: extending arm 10, power system 20, main shaft 210, main gear 211, driven gear 212, central axis 2120 of driven gear 212, hydraulic motor 213, transmission belt 214, side arm 220, driving device 221, main belt 222, driven belt 223, belt pulley 224, fixed shaft 225, driven wheel 226, avoidance disc 30, disc body 31, one-way clutch 32, inner ring 320, outer ring 321, chassis 33, touch rod 35, claw knife 40, knife holder 41, claw 42, L-shaped frame 50, vehicle frame 60, traction device 80. Detailed Description of the Preferred Embodiment:

[0035] Example 1:

[0036] Referring to Fig Figure 1 shown, a passive tree-avoiding weeding device is towed forward by a traction device 80, and includes: an extending arm 10, a power system 20, an avoidance disc 30, and a claw knife 40. Among them, the avoidance disc 30 includes a disc body 31, a one-way clutch 32, and a chassis 33; the one-way clutch 32 includes an inner ring 320, an outer ring 321, and a wedge block; the power system 20 includes a main shaft 210, a main gear 211, and three driven gears 212. The traction device 80 is connected to the extending arm 10 to tow the extending arm 10 to move forward. The avoidance disc 30 is arranged at the lower part of one end of the extending arm 10, the disc body 31 can rotate relative to the extending arm 10, the claw knife 40 is arranged at the lower part of the disc body 31 of the avoidance disc 30, the claw knife 40 extends into the soil, and the power system 20 drives the claw knife 40 to rotate, so that the claw knife 40 rotates in the soil to remove weeds. The power source of the power system 20 can be a hydraulic motor, an electric motor, etc.

[0037] Specifically, the inner ring 320 of the one-way clutch 32 is fixedly connected to the extending arm 10, and the outer ring 321 is fixedly connected to the disk body 31. When the inner ring 320 is fixed, the outer ring 321 can only rotate in one direction. If the outer ring 321 rotates in the reverse direction, the wedge blocks are locked to prevent the outer ring 321 from rotating in the reverse direction, that is, the disk body 31 rotates unidirectionally relative to the inner ring 320. The shape of the disk body 31 matches the shape of the chassis 33. It is a rounded triangle with three sides curved and sunken towards the center of the disk body 31. The edge of the disk body 31 is bent downwards with a rounded corner to form a side surface. The disk body 31 and the chassis 33 enclose the power system 20, which on the one hand protects the power system 20, and on the other hand isolates the power system 20 from the fruit tree, playing a role in protecting the fruit tree.

[0038] When the fruit tree is on the right side of the advancing direction of the traction device 80, the one-way clutch 32 allows the outer ring 321 to drive the disk body 31 to rotate clockwise, and the wedge blocks are not locked; when the disk body 31 rotates counterclockwise, the wedge blocks are locked. During the weeding progress, when encountering a fruit tree, the disk body 31 is passively avoided and rotates clockwise along the fruit tree. Because the advancing speed of the traction device 80 is not fast, the disk body 31 will not damage the outer skin of the fruit tree with this degree of contact. The weeds around the fruit tree are removed cleanly without harming the fruit tree. When the fruit tree is on the left side of the advancing direction of the traction device 80, the rotation direction of the one-way clutch 32 is adjusted to allow the disk body 31 to rotate counterclockwise.

[0039] Specifically, the main gear 211 and the three driven gears 212 are arranged between the disk body 31 and the chassis 33. The three driven gears 212 are evenly arranged around the main gear 211, arranged in a triangle, and the driven gears 212 mesh with the main gear 211. The main shaft 210 passes through the inner ring 320 and the disk body 31 and is fixedly connected to the main gear 211. After passing through the main gear 211, the main shaft 210 is connected to the chassis 33 by a bearing. One end of the central shaft 2120 of the driven gear is connected to the disk body 31 by a bearing, and the other end is connected to the chassis 33 by a bearing and extends out of the chassis 33. The end of the central shaft of the driven gear 212 extending out of the chassis 33 is fixedly connected to the claw knife 40. The driven gears 212 are arranged at the rounded corners of the polygon, and the sides between the driven gears 212 are curved and sunken towards the center of the disk body 31.

[0040] The power source drives the main shaft 210 to rotate, the main shaft 210 drives the main gear 211 to rotate, the main gear 211 drives the driven gears 212 to rotate, and the driven gears 212 drive the claw knife 40 to rotate. The main shaft 210 does not contact the inner ring 320, so that the rotation of the disk body 31 is independent of the rotation of the claw knife 40, and the two rotate independently of each other without interference.

[0041] Specifically, the claw knife 40 includes a knife holder 41 and at least two claws 42. The knife holder 41 is a plane, and the claws 42 extending from the knife holder 41 towards the ground are evenly arranged on one side of the knife holder 41 and fixedly connected to the knife holder 41. The other side of the knife holder 41 is fixedly connected to the power system 20. One end of the claw 42 is perpendicularly fixed to the knife holder 41, and the other end extends towards the ground direction for a certain distance and then bends and extends towards the center of the knife holder 41. Both sides of the claw 42 are sharpened.

[0042] The claw knife 40 extends into the soil for weeding. The rotating claw knife 40 extends into the soil, rotates to pull out weeds and damage the roots of weeds. The claws 42 are strong and durable, and both sides are sharpened, making the rotation more destructive to weeds, preventing weeds from reviving. The claws 42 extend towards the center of the knife holder 41, which has a better effect on cutting grass roots and gathering the loose soil, so that the turned soil does not spill out. It has been used in vineyards for a long time with particularly good results. Moreover, this way of weeding close to the ground will not damage the prostrate grape branches.

[0043] When the fruit tree is on the left side of the traveling direction of the weeding device, the main gear 211 rotates counterclockwise, driving the driven gear 212 to rotate clockwise, that is, the three claw knives 40 rotate clockwise at the same time. Without the one-way clutch 32, after the claw knife 40 enters the soil for weeding, it will drive the disk body 31 to rotate clockwise together. In this way, the rapidly rotating avoidance disk 30 will damage the fruit tree. The one-way clutch 32 solves this problem. The rotation direction of the one-way clutch 32 is opposite to the rotation direction of the driven gear 212, that is, it allows the outer ring 321 to drive the disk body 31 to rotate counterclockwise, and the wedge block is not locked; when the disk body 31 rotates clockwise, the wedge block is locked. In this way, when the claw knife 40 enters the soil for weeding, the disk body 31 will not rotate, and only when encountering a fruit tree, the disk body 31 rotates counterclockwise along the fruit tree, removing the weeds around the fruit tree without damaging the fruit tree. After leaving the fruit tree, the disk body 31 continues to move forward in its current state until it encounters an obstacle again and rotates passively. Because the traveling speed of the traction device 80 is not fast, the degree of contact of the disk body 31 with the fruit tree will not damage the outer skin of the fruit tree.

[0044] Embodiment 2:

[0045] Refer to the attached Figure 2 As shown, on the basis of Embodiment 1, in order to enable the claw knife 40 part to penetrate into the low grape trees, the power system 20 further includes a hydraulic motor 213, a transmission belt 214, a main shaft 210 that is bearing-connected to the extension arm 10. One end of the transmission belt 214 is connected to the hydraulic motor 213, and the other end is connected to the main shaft 210. The hydraulic motor 213 arranged on the extension arm 10 drives the main shaft 210 to rotate through the transmission belt 214.

[0046] This design positions the hydraulic motor 213 away from the claw knife 40 section, allowing the thin disc body 31 plus the claw knife 40 structure to reach deep under the grapevine for weed removal work.

[0047] Embodiment 3:

[0048] As shown in the attached Figure 3 A passive tree-avoiding weed removal device is towed forward by a towing device 80 and includes: an extension arm 10, a power system 20, an avoidance disc 30, and a claw knife 40. Among them, the avoidance disc 30 includes a disc body 31, a one-way clutch 32, and a chassis 33; the one-way clutch 32 includes an inner ring 320, an outer ring 321, and a wedge block; the power system 20 includes a side arm 220, a driving device 221, a main belt 222, a driven belt 223, a pulley 224, a fixed shaft 225, and three driven wheels 226. The avoidance disc 30 is arranged at the lower part of one end of the extension arm 10, the claw knife 40 is arranged at the lower part of the disc body 31 of the avoidance disc 30, and the power system 20 drives the claw knife 40 to rotate. The driving device 221 can be a hydraulic motor or an electric motor, etc.

[0049] Specifically, the inner ring 320 of the one-way clutch 32 is fixedly connected to the extension arm 10, the outer ring 321 is fixedly connected to the disc body 31. When the inner ring 320 is fixed, the outer ring 321 can only rotate in one direction. If the outer ring 321 rotates in the reverse direction, the wedge block locks to prevent the outer ring 321 from rotating in the reverse direction, that is, the disc body 31 rotates unidirectionally relative to the inner ring 320. The shape of the disc body 31 matches the shape of the chassis 33, which is a rounded triangle with all three sides arc-shaped and sunken towards the center of the disc body 31. The edge of the disc body 31 is bent upwards in a rounded shape to form a side surface. The chassis 33 is arranged on the disc body 31 in an open manner. The disc body 31 and the chassis 33 enclose the power system 20. On the one hand, it plays a role in protecting the power system 20, and on the other hand, it isolates the power system 20 from the fruit tree, playing a role in protecting the fruit tree.

[0050] Specifically, one end of the side arm 220 of the power system 20 is fixedly connected to the extension arm 10, and a driving device 221 is arranged at the other end. The side arm 220 and the extension arm 10 form a Y shape. The pulley 224 is sleeved on the fixed shaft 225 through a bearing. One end of the fixed shaft 225 is fixedly connected to the extension arm 10, and the other end is fixedly connected to the inner ring 320. The three driven wheels 226 arranged on the disc body 31 are evenly arranged around the pulley 224 in a triangular shape, and a certain distance is set between the driven wheels 226 and the pulley 224. The central axis of the driven wheel 226 passes through the disc body 31 and is fixedly connected to the claw knife 40. One end of the main belt 222 is connected to the driving device 221, and the other end is connected to the pulley 224. One end of the driven belt 223 is connected to the pulley 224, and the other end is connected to the driven wheel 226.

[0051] Specifically, the claw knife 40 includes a knife holder 41 and at least two claws 42. The knife holder 41 is a plane. The claws 42 extending from the knife holder 41 towards the ground are evenly arranged on one side of the knife holder 41 and fixedly connected to the knife holder 41. The other side of the knife holder 41 is fixedly connected to the power system 20. One end of the claw 42 is perpendicularly fixed to the knife holder 41, and the other end extends towards the ground for a certain distance and then bends and extends towards the center of the knife holder 41. Both sides of the claw 42 are sharpened.

[0052] The driving device 221 drives the belt pulley 224 to rotate in a belt drive manner. The belt pulley 224 drives the driven pulley 226 to rotate in a belt drive manner. The driven pulley 226 drives the claw knife 40 to rotate. The belt pulley 224 is sleeved on the fixed shaft 225 through a bearing. The fixed shaft 225 fixes the inner ring 320 of the one-way clutch 32 and the protruding arm 10. The outer ring 321 is fixedly connected to the disk body 31, so that the rotation of the disk body 31 is independent of the rotation of the belt pulley 224, that is, the rotation of the disk body 31 is independent of the rotation of the claw knife 40, and the two achieve independent rotation of each other without interference.

[0053] When the fruit tree is on the right side of the traveling direction of the weeding device, the driving device 221 drives the belt pulley 224 to rotate counterclockwise. The belt pulley 224 drives the driven pulley 226 to rotate counterclockwise, that is, the three claw knives 40 rotate counterclockwise at the same time. Without the one-way clutch 32, after the claw knife 40 enters the soil for weeding, it will drive the disk body 31 to rotate counterclockwise together. In this way, the rapidly rotating avoidance disk 30 will damage the fruit tree. The one-way clutch 32 solves this problem. The rotation direction of the one-way clutch 32 is selected to be opposite to the rotation direction of the claw knife 40, that is, the outer ring 321 is allowed to drive the disk body 31 to rotate clockwise, and the wedge block is not locked; when the disk body 31 rotates counterclockwise, the wedge block is locked, so that the claw knife 40 enters the soil for weeding and the disk body 31 does not rotate. Only when encountering a fruit tree, the disk body 31 rotates clockwise along the fruit tree, removing the weeds around the fruit tree without damaging the fruit tree. Because the traveling speed of the traction device 80 is not fast, the disk body 31 will not damage the outer skin of the fruit tree due to this degree of contact with the fruit tree.

[0054] Embodiment 4:

[0055] Refer to the appendix Figure 4As shown in the figure, a passive tree-avoiding weeding device is towed forward by a towing device 80, and includes: an extending arm 10, a power system 20, an avoidance disc 30, and four claw knives 40. Among them, the avoidance disc 30 includes a disc body 31, a one-way clutch 32, and a chassis 33; the one-way clutch 32 includes an inner ring 320, an outer ring 321, and a wedge block; the power system 20 includes a side arm 220, a driving device 221, a main belt 222, a driven belt 223, a pulley 224, a fixed shaft 225, and four driven wheels 226. The avoidance disc 30 is arranged at the lower part of one end of the extending arm 10, the claw knives 40 are arranged at the lower part of the disc body 31 of the avoidance disc 30, and the power system 20 can drive the claw knives 40 to rotate by using the method of respectively installing four conductive slip rings.

[0056] Specifically, the inner ring 320 of the one-way clutch 32 is fixedly connected to the extending arm 10, the outer ring 321 is fixedly connected to the disc body 31. When the inner ring 320 is fixed, the outer ring 321 can only rotate in one direction. If the outer ring 321 rotates in the reverse direction, the wedge block locks to prevent the outer ring 321 from rotating in the reverse direction, that is, the disc body 31 rotates unidirectionally relative to the inner ring 320. The shape of the disc body 31 matches the shape of the chassis 33, which is a rounded quadrilateral with four sides arc-shaped sunken towards the center of the disc body 31. The edge of the disc body 31 is bent upwards in a rounded shape to form a side surface. The chassis 33 is arranged on the disc body 31 in an opening manner. The disc body 31 and the chassis 33 wrap the power system 20 therein, on the one hand, playing a role in protecting the power system 20, and on the other hand, isolating the power system 20 and fruit trees, playing a role in protecting fruit trees.

[0057] Specifically, the claw knife 40 includes a knife holder 41 and at least two claws 42. The knife holder 41 is a plane, and the claws 42 extending from the knife holder 41 to the ground are evenly arranged on one side of the knife holder 41 and fixedly connected to the knife holder 41. The other side of the knife holder 41 is fixedly connected to the power system 20. One end of the claw 42 is perpendicularly fixed to the knife holder 41, and the other end extends in the opposite direction for a section and then bends and extends towards the center of the knife holder 41. Both sides of the claw 42 are sharpened.

[0058] The four power systems 20 respectively drive the four claw knives 40. Two claw knives 40 on one diagonal rotate clockwise, and the two claw knives 40 on the other diagonal rotate counterclockwise. When the four claw knives 40 rotate and penetrate into the soil for weeding, the disc body 31 is stable and will not rotate along, reducing the force on the one-way clutch 32, thereby increasing the service life of the one-way clutch 32.

[0059] When the fruit tree is on the right side of the advancing direction of the traction device 80, the one-way clutch 32 allows the outer ring 321 to drive the disk body 31 to rotate clockwise, and the wedge block is not locked; when the disk body 31 rotates counterclockwise, the wedge block is locked. During the weeding process, when encountering a fruit tree, the disk body 31 is passively avoided and rotates clockwise along the fruit tree. Since the advancing speed of the traction device 80 is not fast, the disk body 31 will not damage the outer skin of the fruit tree with this degree of contact, and the weeds around the fruit tree can be removed without harming the fruit tree. When the fruit tree is on the left side of the advancing direction of the traction device 80, the rotation direction of the one-way clutch 32 is adjusted to allow the disk body 31 to rotate counterclockwise.

[0060] Embodiment 5:

[0061] Refer to the appendix Figure 5 As shown in the figure, on the basis of any one of the above-mentioned Embodiments 1-4, it further includes a spring, an L-shaped frame 50, a hydraulic telescopic rod, and a vehicle frame 60. The vehicle frame 60 is connected to the traction device 80. One end of the square-tubular L-shaped frame 50 extending vertically upward is sleeved in the square-tubular vehicle frame 60, and the vehicle frame 60 and the L-shaped frame 50 are connected by a hydraulic telescopic rod. An extension arm 10 is sleeved in one end of the square-tubular L-shaped frame 50 extending horizontally. One end of the spring arranged in the square tube of the L-shaped frame 50 is connected to the L-shaped frame 50, and the other end is connected to the extension arm 10. The spring is used for buffering in the horizontal direction, and the hydraulic telescopic rod is used for adjusting the height of the claw knife 40 from the ground in the vertical direction.

[0062] Embodiment 6:

[0063] Refer to the appendix Figure 6 As shown in the figure, on the basis of any one of the above-mentioned Embodiments 1-5, the angle between the extension arm 10 and the moving direction of the traction device 80 is less than 90°. This traveling method is more labor-saving compared to the fixed method where the extension arm 10 is perpendicular to the traveling direction of the traction device 80. While saving energy, it is more convenient for the disk body 31 to rotate and reduces the force on the fruit tree. Preferably, the angle between the extension arm 10 and the moving direction of the traction device 80 is 45°. In this way, when the claw knife 40 enters the soil for weeding, the force on the extension arm 10 is reduced, increasing its service life.

[0064] On the basis of the above solution, for further optimization, the passive tree-avoiding weeding device is arranged at the rear side of the traction device 80, and the passive tree-avoiding weeding device and the two rear wheels of the traction device 80 are on the same straight line. With this arrangement, the passive tree-avoiding weeding device follows the undulation of the rear wheels and can adapt to the undulating ground faster and more quickly, especially suitable for weeding the ground of vineyards with high and low undulations.

[0065] Embodiment 7:

[0066] A passive tree-avoiding weeding device is towed forward by a towing device 80 and includes: a telescopic arm 10, a power system 20, an avoidance disc 30, and one or two claw knives 40; the avoidance disc 30 includes a disc body 31 and a one-way clutch 32. The avoidance disc 30 is arranged at the lower part of one end of the telescopic arm 10, and the claw knives 40 are arranged at the lower part of the disc body 31 of the avoidance disc 30. The power system 20 drives the claw knives 40 to rotate, and the power source of the power system 20 can be a motor, a hydraulic motor, etc.

[0067] Among them, the one-way clutch 32 of the avoidance disc 30 includes an inner ring 320, an outer ring 321 and a wedge block. When the inner ring 320 is fixed, the outer ring 321 can only rotate in one direction. If the outer ring 321 rotates in the reverse direction, the wedge block locks to prevent the outer ring 321 from rotating in the reverse direction. The inner ring 320 is fixedly connected to the telescopic arm 10, the outer ring 321 is fixedly connected to the disc body 31, and the disc body 31 rotates unidirectionally relative to the inner ring 320. When one claw knife 40 is provided, the outer edge of the disc body 31 is circular; when two claw knives 40 are provided, the outer edge of the disc body 31 is oval, and the two claw knives 40 are symmetrically arranged on both sides of the one-way clutch 32, and the two claw knives 40 are respectively provided with the power system 20.

[0068] Among them, the claw knife 40 includes a knife holder 41 and two claws 42. The knife holder 41 is a plane, and the claws 42 extending from the knife holder 41 to the ground are evenly arranged on one side of the knife holder 41 and fixedly connected to the knife holder 41. The other side of the knife holder 41 is fixedly connected to the power system 20. One end of the claw 42 is perpendicularly fixed to the knife holder 41, and the other end extends in the opposite direction for a certain distance and then bends and extends towards the center of the knife holder 41, and both sides of the claw 42 are sharpened.

[0069] Suitable for a small passive tree-avoiding weeding device, the towing device 80 pushes the passive tree-avoiding weeding device to weed at the back, and the overall structure is simple and light. The claw knife 40 extends into the soil for weeding. The rotating claw knife 40 extends into the soil, rotates and pulls out and destroys the roots of weeds. The claws 42 are strong and durable, and both sides are sharpened, making the rotation more destructive to weeds and preventing weeds from reviving. The claws 42 extend towards the center of the knife holder 41, which can play a role of turning and cutting, and the weeding effect is better. The circular or oval disc body 31 is provided with a rounded bend extending downward or upward to the side for the convenience of the disc body 31 to rotate and avoid along the tree trunk. Some patterns are arranged on the side to increase the friction force, or some flexible protruding stripes are arranged on the side, which has a buffering effect while increasing the friction force, facilitating the disc body 31 to rotate along the fruit tree without damaging the fruit tree.

[0070] When the power source drives a claw knife 40 to rotate, without the one-way clutch 32, after the claw knife 40 enters the soil for weeding, it will drive the disk body 31 to rotate together. In this way, the rapidly rotating avoidance disk 30 will damage the fruit tree. The one-way clutch 32 solves this problem. When the fruit tree is on the right side of the traveling direction of the weeding device, select the claw knife 40 to rotate counterclockwise, allowing the outer ring 321 to drive the disk body 31 to rotate clockwise, and the wedge block is not locked; when the disk body 31 rotates counterclockwise, the wedge block is locked. In this way, the claw knife 40 enters the soil for weeding, and the disk body 31 will not rotate. Only when encountering a fruit tree, the disk body 31 rotates clockwise along the fruit tree, removing the weeds around the fruit tree without damaging the fruit tree.

[0071] When the power source drives two claw knives 40 to rotate, when the two claw knives 40 rotate in opposite directions, the claw knives 40 enter the soil for weeding, and the disk body will not rotate along with it. If the two claw knives 40 rotate in the same direction, without the one-way clutch 32, after the claw knives 40 enter the soil for weeding, they will drive the disk body 31 to rotate together. In this way, the rapidly rotating avoidance disk 30 will damage the fruit tree. The one-way clutch 32 solves this problem. When the fruit tree is on the right side of the traveling direction of the weeding device, select the claw knife 40 to rotate counterclockwise, allowing the outer ring 321 to drive the disk body 31 to rotate clockwise, and the wedge block is not locked; when the disk body 31 rotates counterclockwise, the wedge block is locked. In this way, the claw knives 40 enter the soil for weeding, and the disk body 31 will not rotate. Only when encountering a fruit tree, the disk body 31 rotates clockwise along the fruit tree, removing the weeds around the fruit tree without damaging the fruit tree.

[0072] Embodiment 8:

[0073] Refer to the attached Figure 5 As shown, on the basis of any one of the above-mentioned Embodiments 1-7, the avoidance disk 30 further includes a touch rod 35. One end of the touch rod 35 is fixedly connected to the side surface of the disk body 31, and the other end is a free end extending horizontally outward. The touch rods 35 are evenly fixed on the side surface of the disk body 31. The touch rod 35 is made of a relatively hard elastic material, such as a rubber rod, deformable plastic, or spring. The length of the touch rod 35 is less than 10 cm, so that the fruit tree will not be damaged.

[0074] When the disk body 31 is circular or elliptical, a number of touch rods 35 are arranged on the outer periphery. One end of the touch rod 35 points to the center of the one-way clutch 32, and the other end is bent in an arc in the rotation direction of the disk body 31 after extending outward. When the touch rod 35 touches the fruit tree, due to the block of the touch rod 35, the disk body 31 is driven to rotate, realizing the passive tree avoidance function.

[0075] When the disk body 31 is in the shape of a rounded polygon and each side is arc-shaped and recessed towards the center of the disk body 31, the touch rod 35 is arranged at the recess. The touch rod 35 can be a short straight rod, or one end points to the center of the one-way clutch 32, and the other end extends outward and then bends in an arc in the rotation direction of the disk body 31. In this way, no matter which one of the touch rod 35 and the disk body 31 touches the fruit tree, passive avoidance can be carried out, and the weeding work can be carried out closer to the trunk of the fruit tree.

Claims

1. A passive tree-avoiding weeding device is towed forward by a towing device, and is characterized in that Comprising: A telescopic arm, a power system, a relief disc, and a claw knife. The relief disc is arranged at the lower part of one end of the telescopic arm. The relief disc includes a disc body and a one-way clutch. The one-way clutch includes an inner ring, an outer ring, and a wedge block. When the inner ring is fixed, the outer ring can only rotate in one direction. If the outer ring rotates in the reverse direction, the wedge block locks to prevent the outer ring from rotating in the reverse direction. The inner ring is fixedly connected to the telescopic arm, the outer ring is fixedly connected to the disc body, and the disc body rotates unidirectionally relative to the inner ring. The claw knife is arranged at the lower part of the disc body, and the power system drives the claw knife to rotate. The claw knife includes a tool holder and at least two claws. The tool holder is a plane, and the claws extending from the tool holder to the ground are evenly arranged on one side of the tool holder and fixedly connected to the tool holder. The other side of the tool holder is fixedly connected to the power system. The relief disc further includes a chassis. The power system includes a main shaft, a main gear, and at least three driven gears. The driven gears are evenly arranged around the main gear and mesh with the main gear. The main gear and the driven gears are arranged between the disc body and the chassis. The main shaft passes through the disc body via the inner ring and is fixedly connected to the main gear. After passing through the main gear, the main shaft is connected to the chassis by a bearing. The main shaft does not contact the inner ring. One end of the central axis of the driven gear is connected to the disc body by a bearing, and the other end is connected to the chassis by a bearing and extends out of the chassis. The end of the central axis of the driven gear extending out of the chassis is fixedly connected to the claw knife. The main shaft drives the main gear to rotate, the main gear drives the driven gears to rotate, and the driven gears drive the claw knife to rotate. The shape of the chassis matches the shape of the disc body, both are rounded polygons and each side is arc-shaped and recessed towards the center of the disc body. The driven gears are arranged at the rounded corners of the polygon, and the sides between the driven gears are arc-shaped and recessed towards the center of the disc body.

2. The passive tree-avoiding weeding device according to claim 1, characterized in that, The outer edge of the disc body is circular, elliptical, or a rounded polygon with each side being arc-shaped and recessed towards the center of the disc body.

3. The passive tree-avoiding weeding device according to claim 1, characterized in that, One end of the claw is perpendicularly fixed to the tool holder, and the other end extends in the opposite direction for a certain distance and then bends and extends towards the center of the tool holder. Both sides of the claw are sharpened.

4. The passive tree-avoiding weeding device according to claim 1, wherein, The power system further includes a hydraulic motor and a transmission belt. The main shaft is connected to the telescopic arm by a bearing. One end of the transmission belt is connected to the hydraulic motor, and the other end is connected to the main shaft. The hydraulic motor arranged on the telescopic arm drives the main shaft to rotate through the transmission belt.

5. The passive tree-avoiding weeding device according to claim 1, wherein The power system includes a side arm, a driving device, a main belt, a driven belt, a pulley, a fixed shaft, and at least three driven wheels. One end of the side arm is fixedly connected to the telescopic arm, and the other end is provided with a driving device. The side arm and the telescopic arm form a Y shape. The pulley is sleeved on the fixed shaft through a bearing. One end of the fixed shaft is fixedly connected to the telescopic arm, and the other end is fixedly connected to the inner ring. The driven wheels arranged on the disc body are evenly arranged around the pulley, and a certain distance is set between the driven wheels and the pulley. The central axis of the driven wheel passes through the disc body and is fixedly connected to the claw knife. One end of the main belt is connected to the driving device, and the other end is connected to the pulley. One end of the driven belt is connected to the pulley, and the other end is connected to the driven wheel. The driving device drives the pulley to rotate in a belt drive manner, the pulley drives the driven wheels to rotate in a belt drive manner, and the driven wheels drive the claw knife to rotate. The disc body is a rounded polygon with each side being arc-shaped and recessed towards the center of the disc body. The driven wheels are arranged at the rounded corners of the polygon, and the sides between the driven wheels are arc-shaped and recessed towards the center of the disc body.

6. The passive tree-avoiding weeding device according to claim 1, wherein It further includes a spring, an L-shaped frame, a hydraulic telescopic rod, and a vehicle frame. The vehicle frame is connected to the traction device. One vertically upward end of the square-tube-shaped L-shaped frame is sleeved in the square-tube-shaped vehicle frame. The vehicle frame and the L-shaped frame are connected by a hydraulic telescopic rod. An extension arm is sleeved in one horizontally extending end of the square-tube-shaped L-shaped frame. One end of the spring arranged in the square tube of the L-shaped frame is connected to the L-shaped frame, and the other end is connected to the extension arm.

7. The passive tree-avoiding weeding device according to claim 1, wherein The angle between the extension arm and the moving direction of the traction device is less than 90°.

8. The passive tree-avoiding weeding device according to claim 1, wherein, The passive tree-avoiding and weeding device is arranged at the rear side of the traction device, and the passive tree-avoiding and weeding device and the two rear wheels of the traction device are on the same straight line.

9. Any of the passive tree-avoiding weeding devices according to claims 1-8, characterized in that, The avoidance disc further includes a touch rod. One end of the touch rod is fixedly connected to the side surface of the disc body, and the other end is a free end extending horizontally outwards. The touch rods are evenly fixed on the side surface of the disc body.

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