Weeding device for paddy fields, and rotary brush used therein

Abstract

To provide a weeding device for paddy fields, and a rotary brush used therein, which cannot only reduce labor for weeding operations in the paddy fields but also facilitate replacement of the brush according to the condition of the paddy field and brush wear, even allowing use for purposes other than weeding.SOLUTION: The weeding device for paddy fields comprises: a hull 1 capable of floating on a paddy field; a rotary brush 2 disposed outside the hull 1; a drive motor 3 for rotating the rotary brush 2; and a transmission shaft 4 connecting the drive motor 3 and the rotary brush 2. The rotary brush 2 is constructed by erecting curved bristle members 22 around a shaft body 21.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a weeding device for rice paddies that navigates over rice paddies to weed, and components used therein. [Background technology]

[0002] In paddy fields where crops such as rice are grown, weeds that grow in the paddy fields rob the crops of moisture and nutrients, causing adverse effects such as a decline in quality, so weeders have been developed to remove weeds.There are various types of weeders available, including walk-behind types, ride-on types, and attachment types that can be attached to rice transplanters, but large machines are difficult to handle and manual operation is labor-intensive, making the work difficult to carry out casually.

[0003] To address this issue, small weeding devices that can be floated in rice paddies have been developed (see, for example, Patent Document 1). However, among these conventional weeding devices, screw-type devices are less effective at removing weeds in rice paddies, making it difficult to achieve sufficient weed control in deep rice paddies. Furthermore, screw-type devices are prone to running aground in areas with shallow water, making them difficult to use in paddies with uneven bottoms. For this reason, weeding devices that use rotating brushes have also been developed (see, for example, Patent Documents 2 and 3).

[0004] However, because the above-mentioned conventional rotary brush type weeding device has a structure in which the rotary brush is mounted inside the device's hull, there is a limit to the length of the bristles of the rotary brush, and in places with deep water, the bristles do not reach the bottom of the paddy field, resulting in a reduced weed-killing effect.Furthermore, if the bristles do not touch the muddy surface at the bottom, the effect of stirring up the paddy field soil and muddying the water is weakened, making it difficult to achieve not only the effect of removing weeds but also the effect of suppressing weed proliferation.

[0005] In addition, the above-mentioned built-in brush type devices are difficult to remove and replace, and it is also difficult to make them larger, which limits the area that can be weeded in one trip.Furthermore, the above-mentioned conventional devices were not designed to be used for plowing rice paddies or soil preparation, and the corresponding rotating brushes could not be easily removed and attached, making it difficult to make the device multifunctional and use it for purposes other than weeding. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 7291425 [Patent Document 2] Japanese Patent Application Laid-Open No. 2016-152775 [Patent Document 3] Japanese Patent Publication No. 2020-162492 Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention aims to solve the problems of the prior art described above. In summary, the object of the present invention is to provide a weeding device for paddy fields that not only reduces the labor required for weeding paddy fields, but also allows for easy replacement of brushes depending on the condition of the paddy field and wear of the brushes, and can be used for purposes other than weeding, as well as a rotating brush used therein. [Means for solving the problem]

[0008] In order to solve the above problem, the inventor has constructed a weeding device for rice paddies that includes a hull 1 that can float above rice paddies, a rotating brush 2 arranged on the outside of the hull 1, a drive motor 3 for rotating the rotating brush 2, and a transmission shaft 4 that connects the drive motor 3 and the rotating brush 2, and has constructed the rotating brush 2 by erecting curved bristle members 22 around a shaft body 21 (the effects will be described later).

[0009] In this specification, "paddy field weeding device" means a device that can be used at least for weeding purposes, but also includes devices whose main purpose is other than weeding, such as plowing or stirring the soil. "Weeding" also includes not only the removal of grown weeds but also the suppression of weed growth and propagation.

[0010] Furthermore, in the present invention, by curving the bristle members 22 of the rotating brush 2 in the circumferential direction or the axial direction of the shaft 21, the weeding effect can be improved and the problem of seedling damage due to excessive brush contact in shallow paddy fields can be solved. Furthermore, by shaping the rotating brush 2 as described above, the rotational resistance of the rotating brush 2 can be reduced and the output required for the drive motor 3 can be reduced, which makes it possible to make the drive motor 3 itself smaller and reduce the weight and size of the device. Furthermore, making the device smaller and lighter allows it to operate with less power and extend the continuous operating time.

[0011] Furthermore, the rotary brush 2 can be placed on both sides of the hull 1 or between a plurality of hulls 1 arranged in parallel, and an excellent weed-killing effect can be obtained in either placement.

[0012] Furthermore, in the present invention, the above-mentioned rotating brush 2 can be arranged on both sides of the hull 1, and a protective member 5 can be attached to the rotating brush 2 on the side opposite the hull 1, thereby preventing the problem of the brush bristles touching the bank and causing weeds to become tangled.

[0013] Furthermore, in the present invention, a mudguard 16 can be provided around the rotating brush 2, and a solar panel 7 can be provided on the upper surface of the hull 1 or the mudguard 16. This allows the device to be operated while charging using the solar panel 7, and the mudguard 11 can also eliminate the problem of mud and weeds kicked up by the rotating brush 2 covering the solar panel 7 and reducing power generation performance.

[0014] Furthermore, in the present invention, the rotating brush 2 of the paddy field weeding device is composed of a shaft 21 and bristle members 22 arranged upright around the shaft 21, and the bristle members 22 can be composed of linear bodies curved in the circumferential direction of the shaft 21 or in the axial direction of the shaft 21. [Effects of the Invention]

[0015] The paddy field weeding device of the present invention employs an external brush structure in which the rotating brush is located on the outside of the hull, so the bristles of the rotating brush can be made longer as needed compared to devices with built-in brushes. This allows the bristles of the rotating brush to touch the muddy surface at the bottom even in deep paddy fields, making it more effective at removing weeds, and the long bristles of the rotating brush also improve propulsion power during navigation.

[0016] Furthermore, since the present invention employs an external brush structure, even if the rotating brush becomes damaged due to prolonged or repeated use, it can be easily replaced with a new one, and multiple types of rotating brushes with different bristle lengths, shapes, and density can be used depending on the conditions of the rice paddy.

[0017] Furthermore, the adoption of an external brush structure in this invention makes it easy to increase the size of the rotating brush, and it is possible to use a wider rotating brush to expand the weeding range. This expands the weeding range per cruise, thereby achieving excellent weeding effects in a short cruise time.

[0018] Furthermore, if the paddy field weeding device of the present invention uses a rotating brush with excellent soil mixing effects, it can be used not only for weeding purposes such as removing weeds in the paddy field and suppressing their growth, but also for plowing to level the bottom of the paddy field and for soil preparation by mixing in fertilizer. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is an overall perspective view showing a weeding device for paddy fields in a first embodiment of the present invention. FIG. [Figure 2]1 is a front view showing a paddy field weeding device according to a first embodiment of the present invention. FIG. [Figure 3] 1A and 1B are a plan view and a longitudinal sectional view showing a state in which an upper cover of a weeding device for paddy fields according to a first embodiment of the present invention is removed. [Figure 4] 3 is an enlarged view showing the surface shape of a bristle member of the rotary brush according to the first embodiment of the present invention. FIG. [Figure 5] 2A and 2B are an enlarged perspective view and an enlarged cross-sectional view showing a cover member of the paddy field weeding device according to the first embodiment of the present invention, respectively, and a state in which the cover member is attached. DETAILED DESCRIPTION OF THE INVENTION

[0020] An embodiment of the present invention will be described with reference to Figs. 1 to 5. In the figures, the symbol A indicates a paddy field weeding device, and the symbol 1 indicates a hull. The symbol 2 indicates a rotating brush, and the symbol 3 indicates a drive motor. The symbol 4 indicates a transmission shaft, and the symbol 5 indicates a protective member. The symbol 6 indicates a cover member, and the symbol 7 indicates a solar panel. The symbol 8 indicates a GPS device.

[0021] 1 to 3, the orientation of the protective member 5 on the left side (vertical) and the orientation of the protective member 5 on the right side (horizontal) are changed to make it easier to understand the structure of the device, but both are oriented horizontally on the water surface when in use. For the same purpose, the cover member 6 is not attached to the left side of the device, but is attached only to the right side, but the device is generally used with cover members 6 attached to both the left and right sides.

[0022] "Configuration of a paddy field weeding device" [1] Basic configuration The basic configuration of the paddy field weeding device A of this embodiment will be described below. As shown in Figures 1 to 3, the paddy field weeding device A of this embodiment is configured such that rotating brushes 2 are arranged on the left and right outer sides of a hull 1 configured to be able to float above a paddy field when viewed from the front, and a drive motor 3 for rotating the rotating brush 2 is attached to the inside of the hull 1, and this drive motor 3 and the rotating brush 2 are connected by a transmission shaft 4 so that the rotating brush 2 can be rotated by the drive motor 3.

[0023] The rotating brush 2 is made up of a shaft 21 and bristle members 22 standing upright around the shaft 21, and the shaft 21 is detachably attached to a transmission shaft 4 that protrudes outward on the left and right sides of the hull 1. This allows the shaft 21 of the rotating brush 2 to rotate and the bristle members 22 to paddle through the water, thereby removing weeds in the water and allowing the hull 1 to navigate over rice paddies using the propulsive force generated by this.

[0024] Furthermore, by adopting the configuration of the paddy field weeding device A described above, weed removal work in paddy fields can be carried out efficiently and labor-savingly, and furthermore, the rotating brush 2 arranged on the outside of the hull 1 can be easily replaced, so not only can damaged or worn rotating brush 2 be replaced with a new one, but multiple types of rotating brush 2 with different lengths, shapes, and density of bristle members 22 can be used according to the conditions of the paddy field (water depth and amount of weeds).

[0025] [2] About the hull [2-1] Hull material Next, we will explain each component of the paddy field weeding device A. First, regarding the hull 1, in this embodiment, a lightweight polystyrene foam box is processed and used as the hull 1, but the main material of the hull 1 is not particularly limited as long as it allows the hull 1 to float on water, and for example, foamed resin other than polystyrene foam, non-foamed plastic material, wood, metal material, etc. can also be used. Furthermore, a combination of multiple materials can be used, and different materials can also be used in parts.

[0026] [2-2] Hull shape 1 to 3, the shape of the main body 11 of the hull 1 is box-shaped with an internal storage section (hollow section), but the shape of the main body 11 is not limited to that of the present embodiment and other shapes can be adopted as long as they are capable of storing the drive motor 3 and the like inside. Also, in this embodiment, a lid 12 is provided on the top of the main body 11 of the hull 1, and the drive motor 3, electronic devices, batteries, and the like can be installed in the storage section of the main body 11 in the state shown in Figures 3(a) and (b) with the lid 12 removed.

[0027] In this embodiment, as shown in Figure 3(b), steps 14 that are one step higher than the bottom 13 are formed in front of and behind the bottom 13 within the storage section of the main body 11 of the hull 1, making it possible to install electronic devices and the like in these steps 14. These steps 14 can be formed by fixing polystyrene foam plates or blocks within the storage section of the hull 1, but they can also be formed by dividing the storage section into upper and lower sections using partitions or the like. Steps 14 can also be formed on either the front or rear or both the left and right sides of the hull 1.

[0028] [2-3] Waterproof rubber In this embodiment, an elastically deformable waterproof rubber 15 is provided on the side of the main body 11 of the hull 1 shown in Figure 1 at the portion through which the transmission shaft 4 passes. By providing this waterproof rubber 15, it is possible to prevent a gap from occurring between the hull 1 and the transmission shaft 4, thereby preventing the problem of water entering the interior of the hull 1 through the portion through which the transmission shaft 4 passes when the hull 1 is sailing over rice paddies.

[0029] [2-4] Mudguard In this embodiment, as shown in Figures 1 and 2, a top plate T is attached to the top of the hull 1, and mudguards 16 are formed on the left and right sides of the top of the hull 1. These mudguards 16 are positioned to protrude above the rotating brush 2, and the underside of the mudguards 16 can catch mud and weeds thrown up by the rotating brush 2. In this embodiment, the mudguards 16 are flat, but the shape is not limited to a flat plate and can also be curved. Furthermore, the mudguards 16 protruding from the side of the hull 1 can also be formed by a method other than the top plate T. The mudguards 11 eliminate the problem of mud and weeds thrown up by the rotating brush 2 accumulating on the top of the hull 1, and therefore do not cause problems such as an increase in the weight of the hull 1 due to deposits of mud and the like, which can cause the hull 1 to sink during long sailings, resulting in rapid battery drain and a decrease in sailing speed.

[0030] [2-5] Anti-mud coating A coating layer can be formed on the surface of the hull 1 by painting or the like to prevent mud and weeds from adhering to the hull 1. Specifically, a coating can be applied to smooth the surface, or a waterproof coating can be applied. There are no particular restrictions on the location where the coating layer is formed, but it is preferable to form the coating layer on the underside of the mudguard 16, the side of the hull 1, or the like.

[0031] [2-6] Example of hull modification In this embodiment, a configuration is adopted in which the rotary brushes 2 are arranged on both sides of one hull 1, but it is also possible to adopt a gate-like configuration in which multiple hulls 1 are arranged in parallel and rotary brushes 2 are arranged inside them.It is also possible to adopt a configuration in which multiple hulls 1 with rotary brushes 2 on both sides are connected left and right or front and rear.

[0032] [3] About the rotating brush [3-1] Axial body In this embodiment, the shaft 21 of the rotating brush 2 is cylindrical, and the transmission shaft 4 is inserted into the hollow portion of the shaft 21, so that the rotating brush 2 is detachably attached to the transmission shaft 4. Fastening means, locking means, fitting means, etc. can be used as a means for detachably fixing the shaft 21 to the transmission shaft 4. The shape of the shaft 21 of the rotating brush 2 can be any shape other than cylindrical, such as a square tube, columnar, or rectangular pillar, as long as it can be detachably fixed to the transmission shaft 4. Furthermore, although a plastic material is used for the material of the shaft 21 in this embodiment, there is no particular limitation on the material, and various materials can be used, and the length of the shaft 21 of the rotating brush 2 is not limited to the length in this embodiment and can be changed as appropriate.

[0033] [3-2] Hair member As shown in Figures 1, 2, and 3(a), the bristles 22 of the rotary brush 2 are arranged (planted) around the shaft 21 at a predetermined density, and the arrangement and density of the bristles 22 can be changed as needed. If the density of the bristles 22 is too high, seedlings in the paddy field are more likely to be damaged, and the rotational torque required for the transmission shaft 4 increases. On the other hand, if the density of the bristles 23 is too low, the weed-killing effect and propulsive force during navigation decrease. Therefore, a density of the bristles 22 that takes balance into consideration is preferable. Regarding the material and thickness of the bristles 22, in this embodiment, linear bodies made of a hard plastic material are used, but other materials with the required strength (resistance to breakage) and durability (wear resistance) and thickness can also be used.

[0034] In this embodiment, the bristles 22 are configured as linear bodies curved in the rotation direction of the shaft 21, as shown in FIG. 1. This prevents the bristles 22 of the rotary brush 2 from contacting the paddy field bottom too strongly, even when the paddy field is shallow, reducing the risk of damage to seedlings in the paddy field. In this embodiment, the bristles 22 are curved in the rotation direction of the shaft 21, but the same effect can be achieved by curving them outward to the left or right of the hull 1. The length of the bristles 22 can be changed as needed depending on the paddy field depth and the intended use (e.g., plowing or soil preparation). In this embodiment, all bristles 22 in the rotary brush 2 are of the same length, but bristles 22 of different lengths or shapes can also be used in combination.

[0035] By making the rotating brush 2 curved, the rotational resistance of the rotating brush 2 can be reduced and the output required for the drive motor 3 can be reduced, which in turn makes it possible to make the drive motor 3 itself smaller and lighter in weight and size of the paddy field weeding device A. Furthermore, by making the paddy field weeding device A smaller in size and weight, the device can be operated with less power, which reduces battery consumption and extends the continuous operating time.

[0036] As shown in Figures 1 and 4(a), the bristle members 22 of this embodiment have an uneven surface with convex portions 22a and concave portions 22b. This makes it easier for grass to become entangled in the concave portions when the bristle members 22 paddle through water, thereby further improving the weeding effect. The uneven surface shape of the bristle members 22 is not limited to the shape of this embodiment, as long as it has convex portions 22a and concave portions 22b on its surface. For example, a shape with spherical convex portions formed at predetermined intervals as shown in Figure 4(b), a shape with notches formed at predetermined intervals as shown in Figure 4(c), or a twisted shape as shown in Figure 4(d) can also be used. The concave portions on the surface of the bristle members 22 are formed at predetermined intervals at least in the length direction of the bristle members 22, and have a height difference that affects grass entanglement and soil agitation, and is preferably 1 / 5 to 1 / 2 the diameter of the bristle members 22.

[0037] [3-3] Example of changing the rotating brush In this embodiment, one rotating brush 2 is arranged on each side of the hull 1, but four or more rotating brushes 2 can also be arranged in a front-to-back configuration. Also, when rotating brushes 2 are arranged inside multiple hulls 1, only one rotating brush 2 can be used.

[0038] [4] Drive motor and transmission shaft [4-1] Drive motor 3(a) and 3(b), in this embodiment, two drive motors 3 corresponding to the left and right rotating brushes 2 are fixed to the bottom 13 of the storage section of the hull 1, offset from one another, and the drive shafts 31 of each drive motor 3 are connected to the transmission shafts 4 to which the respective rotating brushes 2 are attached. In this embodiment, a DC motor is used for the drive motor 3, and it is fixed to a wooden base that is then glued to the bottom of the hull 1. However, the type of drive motor 3 can be changed as needed depending on the required performance, and the mounting method and position can also be changed as needed depending on the material and shape of the hull 1.

[0039] Furthermore, the drive shaft 31 of the drive motor 3 can be directly connected to the transmission shaft 4, but they can also be connected via a reduction gear to adjust the rotational speed and rotational torque. If the drive motor 3 and the transmission shaft 4 are installed at different heights within the accommodation section of the hull 1 (for example, if the drive motor 3 is installed higher than the transmission shaft 4), they can also be connected via a power transmission mechanism such as a transmission belt or transmission chain.

[0040] [4-2] Motor control unit and battery In this embodiment, as shown in Figures 3(a) and 3(b), the motor control unit C of the drive motor 3 is installed in a step 14 at the front of the accommodation section of the hull 1, and the battery B that serves as the power source for the drive motor 3 and the motor control unit C is installed in a step 14 at the rear of the accommodation section of the hull 1. These are then electrically connected. There are no particular restrictions on their placement, but by taking into account the center of gravity and weight balance of the hull 1, the stability of the hull during navigation can be improved by placing the heavier motor control unit C and battery B at the front or rear of the hull 1.

[0041] The motor control unit C is an electronic device (microcomputer) that sends control signals to the drive motor 3 to control start / stop and output, and when the paddy field weeding device A is to be automatically navigated, it can also send control signals to the drive motor 3 based on data calculated by a predetermined program. There are no particular restrictions on the battery B, as long as it can supply electricity to the drive motor 3 and motor control unit C continuously for a certain period of time. In this embodiment, the battery B is also electrically connected to a solar panel, which will be described later.

[0042] [4-3] Transmission shaft As shown in Figures 1, 2, and 3(a) and (b), the transmission shaft 4 is a metal rod-shaped member that is connected to the drive motor 3 inside the housing of the hull 1 and penetrates the hull 1, protruding outward to the left and right; in this embodiment, a shaft 4 is used that is long enough to penetrate the shaft 21 of the rotating brush 2. In this embodiment, a bearing member R for the transmission shaft 4 is provided inside the housing of the hull 1, and the transmission shaft 4 is attached to this bearing member R. In this embodiment, the tip of the transmission shaft 4 is threaded so that a nut can be attached. The shape of the transmission shaft 4 can be changed as needed depending on the method of attaching the rotating brush 2 to the transmission shaft 4.

[0043] [5] Protective materials In this embodiment, as shown in Figures 1 and 2, the protective members 5 are attached to the left and right outer sides of the rotating brush 2 when viewed from the front, without being linked to its rotational movement. This allows the protective members 5 to be placed outside the rotating brush 2 in use, floating on the water without rotating, preventing the bristles from touching the levee and causing weeds to become tangled when the paddy field weeding device A hits the levee of a paddy field. Note that because the protective members 5 are attached rotatably and without being linked to the rotating brush 2, when the hull 1 is floated on a paddy field, they are in a horizontal position, as shown by the protective member 5 on the right side of Figure 2.

[0044] In this embodiment, the protective member 5 is a cylindrical plastic member, but there are no particular limitations on the material or shape, and it may be hollow or solid. The size of the protective member 5 can be changed appropriately depending on the size of the rotating brush 2 (the length of the bristle members 22), but it is preferable that the size correspond to the length of the bristle members 22 of the rotating brush 2 so that the bristles do not touch the ridges.

[0045] In this embodiment, an axially threaded hole is formed on the outside of the shaft 21 of the rotating brush 2, and a bolt member N is inserted into this threaded hole from the outside of the protective member 5 and screwed to fasten the rotating brush 2 and the protective member 5. This makes it easy to detach, attach, and replace the protective member 5. Note that a method of connecting the rotating brush 2 and the protective member 5 in a non-interlocking state can also be used in which a rotating shaft protruding in the axial direction is provided on the outside of the shaft 21 of the rotating brush 2, and this rotating shaft is inserted into the protective member 5 from the inside and fastened with an outer nut member (not shown).

[0046] Furthermore, in this embodiment, the protective member 5 is attached by the bolt member N in a state where it is not interlocked with the rotating brush 2, but the transmission shaft 4 can also be passed through the shaft body 21 of the rotating brush 2 and the protective member 5, and a nut member can be attached to the tip of the passed-through transmission shaft 4 for fastening; there is no particular limitation on the method of fixing the protective member 5. The material of the protective member 5 is not particularly limited as long as it can prevent contact between the rotating brush 2 and ridges, etc., but a hard material that will not be damaged even if it hits a ridge, etc. is preferable, and a plastic bottle or the like that is easily replaceable can be used.

[0047] [6] Cover material 5(a) and 5(b), a cover member 6 is used to close the gap between the protective member 5 and the rotary brush 2, thereby preventing weeds from getting tangled in the gap between the protective member 5 and the shaft 21 of the rotary brush 2, causing the protective member 5 to rotate together with the rotary brush 2. The cover member 6 is composed of a tubular portion 61, which is the main body, and a clip portion 62. The tubular portion 61 is placed over the shaft 21 of the rotary brush 2, and the clip portion 62 grips the protective member 5, allowing the tubular portion 61 to rotate freely together with the protective member 5 and with respect to the shaft 21 of the rotary brush 2.

[0048] The shape of the cover member 6 is not limited to that of this embodiment, and for example, the shape of the cylindrical body 11 can be changed appropriately depending on the shape of the shaft body 21 of the rotating brush 2, and the shape of the clip portion 62 can be changed appropriately depending on the shape of the protective member 5, or a shape without the clip portion 62 can be adopted. Also, although the cover member 6 is a separate component from the rotating brush 2, it can also be formed integrally as part of the rotating brush 2. Furthermore, although injection-molded plastic is used as the material for the cover member 6 in this embodiment, other materials such as metal can also be used.

[0049] [7] Solar panels In this embodiment, as shown in Figures 1 and 2, a solar panel 7 is installed on the upper surface of the hull 1. This allows the battery B to be charged by the solar panel 7, allowing the paddy field weeding device A to operate continuously. Furthermore, in this embodiment, the mudguard 15 eliminates the problem of mud and weeds covering the solar panel 7 (accumulating on the solar panel 7) and reducing power generation performance. By eliminating this problem, it is also possible to prevent a reduction in power generation performance during long voyages.

[0050] In this embodiment, the solar panel 7 is installed in the center of the top plate T, but the solar panel 7 can also be installed on the top surface of the mudguard parts 15 on both the left and right sides of the top plate T, and there are no particular restrictions on the position, number, or size of the solar panel 7. The type of solar panel 7 is not particularly limited as long as it can supply electricity generated by sunlight to the battery B. The solar panel 7 allows the paddy field weeding device A to operate continuously during the day without charging the battery B, and also enables operation at night using electricity generated during the day.

[0051] [8] GPS devices In this embodiment, as shown in Figure 3(a), a GPS device 8 is provided on the hull 1, making it possible to acquire map information of the paddy field and position information of the paddy field weeding device A. This makes it possible to determine the positions of paddy field ridges and obstacles from the route of the paddy field weeding device A, and also makes it possible to automatically navigate the paddy field weeding device A along a predetermined route. The GPS device 8 is configured to be able to communicate wirelessly with the management terminal of the paddy field weeding device A and with other paddy field weeding devices A.

[0052] [9] Navigation control In this embodiment, the paddy field weeding device A is configured to be able to navigate automatically using an automatic control program of a control device installed inside the hull 1 and a navigation management system that can communicate remotely with the control device, but it can also be configured to be able to manually operate the paddy field weeding device A using a remote controller that can communicate remotely with the control device. [Explanation of symbols]

[0053] 1. Hull 11 Main body 12 Lid 13 Bottom 14 Step 15 Waterproof rubber 16 Mudguard 2 rotating brushes 21 Shaft 22 Hair member 22a Convex part 22b Recess 3 Drive motor 31 Drive shaft 4 Transmission shaft 5 Protective materials 6 Cover member 61 Cylinder part 62 Clip part 7. Solar Panels 8 GPS device A Weeding device for rice fields C Motor control unit B. Battery R bearing material T Top plate N bolt material

Claims

1. The device comprises a hull capable of floating on rice paddies, a rotary brush detachably attached to the outside of the hull, a drive motor for rotating the rotary brush, and a transmission shaft connecting the drive motor and the rotary brush, A weeding device for paddy fields, wherein bristle members made of curved linear bodies are erected around the shaft of the rotary brush.

2. 2. A weeding device for paddy fields according to claim 1, wherein the bristle members of the rotary brush are curved in the circumferential direction of the shaft or in the axial direction of the shaft.

3. 3. A weeding device for paddy fields according to claim 1 or 2, wherein the rotary brushes are arranged on both sides of a hull or inside a plurality of hulls arranged in parallel.

4. 4. A weeding device for paddy fields according to claim 3, wherein the rotary brushes are arranged on both sides of the hull, and a protective member is attached to the rotary brushes on the side opposite to the hull.

5. 3. The weeding device for paddy fields according to claim 1, wherein a mudguard is provided around the rotary brush, and a solar panel is provided on the upper surface of the hull or the mudguard.

6. A rotary brush used in a paddy field weeding device, which consists of a shaft body and bristle members arranged upright around the shaft body, the bristle members being linear bodies curved in the circumferential direction or axial direction of the shaft body.

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