JP2010068778A - Paddy weeder and paddy weeding travel apparatus equipped with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a paddy weeder which can sufficiently remove weeds grown between rows and can prevent the damages of rice foots. <P>SOLUTION: There is provided the paddy weeder 1 which jets a pressurized fluid in a paddy S to weed, characterized by having a fluid-pressuring and supplying mechanism 10 which supplies the pressurized fluid, a flow passage pipe 20 which is communicated with the fluid-pressuring and supplying mechanism 10, and jet bodies 30 which are rotatably attached to the flow passage pipe 20, wherein the jet bodies 30 can be freely turned on a horizontal plane, when in use, and has a flow passage 33 which is communicated with the flow passage pipe 20 to flow the pressurized fluid, and a jet orifice 34 which is communicated with the flow passage 33 to jet the pressurized fluid downward from the horizontal direction. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a paddy field weeding device and a paddy field weeding traveling device for removing weeds that grow in paddy fields, especially weeds that have occurred between strains and that are not immediately expressed.

  Usually, paddy fields are planted in paddy fields that have been scratched and softened, and weeds have disappeared. However, weeds are generated in the paddy fields when the rice plants are rooted in the bottom of the paddy fields.

  Therefore, conventionally, high pressure air or water is injected into the paddy field, and the soil covering the weed roots is blown away by stirring the soil with the paddy water to remove this weed. . As such a thing, the weeding apparatus for paddy fields which weeds between strains is known (for example, refer to patent documents 1).

In this weeding device for paddy fields, when the inter-strain is detected by a sensor for identifying the presence or absence of a rice stock, a free arm linked to this sensor moves back and forth between the stock avoiding the rice stock, and at the same time, a conduction pipe supported by this free arm. Enters between the stocks and injects the pressure fluid. And the free arm repeats the reciprocating movement quickly, and the weeding operation of intermittent spraying is performed to remove weeds generated between the strains.
JP 2002-34305 A

  By the way, in the above-mentioned paddy weeding apparatus, the free arm moves before jetting a sufficient amount of pressure fluid by pulling out the conduction pipe from between the strains in a short time to prevent contact between the conduction pipe and the rice plant. I was doing it. For this reason, the soil between the strains cannot be sufficiently stirred, and reliable weeding may not be performed.

  In addition, if the conduction pipe is moved at a low speed between the plants in order to sufficiently inject the pressure fluid, there is a problem that the conduction pipe comes into contact with the rice plant and damage to the rice plant increases.

  Then, this invention makes it the subject to provide the weeding apparatus for paddy fields which can fully remove the weed which generate | occur | produced between the strains, and can also suppress the damage of a rice strain.

  In order to solve the above-mentioned problems, the present invention provides a paddy weeding apparatus that sprays a pressure fluid into a paddy field, and a fluid pressurizing and supplying mechanism for supplying the pressure fluid, and the fluid pressurizing and supplying mechanism. And a spray port body rotatably attached to the flow path tube body, the spray port body being rotatable in a horizontal plane during use, and the flow channel It has a flow passage for communicating the pressure fluid in communication with the pipe body, and an injection port for communicating the pressure fluid and injecting the pressure fluid downward from the horizontal direction. .

  The injection port body has a flat gear shape and has a tooth tip portion formed in an involute curve, and the injection port is formed on a tooth width surface or a lower surface of the tooth tip portion. It is good.

  Further, the injection port body may have a trilobe gear shape.

  Further, the injection port body includes a ring-shaped tube formed by bending a pipe so that the outer peripheral surface has a trilobe gear shape formed in an involute curve in plan view, and the injection port includes: It may be provided on the outer peripheral surface of the ring-shaped tube.

  The paddy field weeding travel device provided with the paddy field weeding device according to the present invention is equipped with the pressurized fluid supply mechanism and the flow path tube body, and is capable of traveling, and the jet from the bottom surface of the paddy field. It has a height adjustment mechanism that adjusts the distance to the mouth.

  According to the present invention configured as described above, since the pressure fluid is jetted slightly downward from the horizontal direction from the jet nozzle body, toward the weeds of paddy fields, especially the weeds generated between the difficult strains The roots of the weeds can be rinsed by spraying a pressure fluid, and the weeds can be suspended in water to ensure weeding.

  In addition, since the spray body can be rotated in a horizontal plane during use, when the spray body comes into contact with the rice plant, the spray body separates from the rice plant due to the contact force generated between the rice plant and the rice plant. It can be rotated in the direction to reduce damage to rice plants.

  In particular, since weeds from the generation to the second leaf stage have weak rooting power, they can be easily suspended by the pressure of the injected pressure fluid.

  Furthermore, since the reaction force due to the pressure fluid ejected from the jet body acts in the direction of separating the jet body from the rice stock, the aforementioned contact force is further reduced and the jet body comes into strong contact with the rice stock. This makes it possible to further suppress damage to rice plants. In addition, the influence which a pressure fluid has on a rice plant can further be reduced by adjusting the injection pressure of a pressure fluid.

  In addition, in the case where the injection nozzle body has a tooth tip portion formed in an involute curve, the injection nozzle body and the rice plant appear to be engaged with the gear and the sprocket. The tip of the tooth is easy to go in and out. Therefore, the pressure fluid can be sprayed from a close distance toward the roots of the weeds generated between the strains, and the weeds between the strains can be reliably removed.

  Further, in the case where the injection port body has a trilobe gear shape, the amount of the injection port body entering between the stocks is increased as compared with that of the multi-leaf gear, that is, the injection port body The tooth tip can penetrate deeply between the stocks. Thereby, it becomes possible to perform weeding between strains more reliably.

  In addition, in the case where the injection port body is a ring-shaped tube formed by bending a pipe so as to form a trilobe gear shape having an outer peripheral surface formed in an involute curve, the weight can be reduced. It is possible to alleviate the impact on the rice plant and reduce the burden on the channel tube.

  Then, the pressurized fluid supply mechanism and the flow path tube body are mounted on the travelable vehicle body in a state in which the height is adjusted by the height adjustment mechanism so that the distance between the bottom surface of the paddy field and the jet body is constant. In the paddy field weeding travel device, the spray body can be moved between the furrows along the line-up direction of the rice stock by running the vehicle body along the furrows. Therefore, the pressure fluid can be ejected while the ejection port body is easily moved, and the weeding work between the furrows and the strains can be facilitated.

  In addition, when the intervals between the plurality of flow passage tubes are adjusted to the furrows and the injection nozzles are respectively attached to the respective flow passage tubes, the weeding operation between the plurality of furrows and the stocks is simultaneously performed while the vehicle body travels along the furrows. It becomes possible.

  BEST MODE FOR CARRYING OUT THE INVENTION The best embodiment of a paddy field weeding apparatus 1 according to the present invention will be described with reference to the drawings. In addition, the direction shown by the arrow F in the figure is the forward direction of the paddy field weed traveling apparatus 2 provided with the paddy field weeding apparatus 1.

  The paddy field weeding apparatus 1 includes a fluid pressure supply mechanism 10, a flow channel tube 20 communicating with the fluid pressure supply mechanism 10, and an injection port body 30 attached to the flow channel tube 20. It is mounted on the vehicle body 3.

  The vehicle body 3 includes a frame 3b, a handle 4 attached to the frame 3b, a steering wheel 5 operated by the handle 4, and a pair of rear wheels 6 and 6 provided at the rear portion of the frame 3b (see FIG. 2). ). It is to be noted that a paddy field weeding traveling device (hereinafter referred to as a traveling device) 2 is configured by arranging a seat 3a on which a passenger sits on the vehicle body 3 and an engine (not shown), and the rear wheels 6 and 6 are engine It is driven by and can run on its own. In addition, the traveling device 2 can travel in a manner corresponding to each intercostal space (rows) W (see FIG. 2) of a large number of rice stocks K in which the steered wheels 5 and the rear wheels 6 and 6 are planted in paddy fields. It has become.

  Here, “Sakuma W” refers to a relatively wide width among a large number of rice plants K,... Planted vertically and horizontally, and “Strain P” is planted vertically and horizontally. It refers to a relatively narrow width among a large number of rice stocks K,. In general, rice is planted along the traveling direction of the rice planting machine, and the planting interval of the rice at this time is defined as the inter-plant P, and the traveling position orthogonal thereto is defined as the intercostal space W (see FIG. 2).

  The fluid pressurizing and supplying mechanism 10 supplies water in a high pressure state by applying pressure, and the pair of water storage tanks 12 and 12 (see FIG. 2) and the water in the water storage tanks 12 and 12 are supplied. It has a pressure feed pump 13 that pressurizes and discharges, and a prime mover 14 that drives the pressure feed pump 13.

  The pair of water storage tanks 12, 12 store water sprayed toward the weeds, and are arranged so as to sandwich the frame 3 b of the vehicle body 3, and the steered wheels 5 and the drive wheels 6, 6 are arranged. It is attached between.

  The pressure feed pump 13 and the prime mover 14 are respectively disposed above the water storage tanks 12 and 12, and each water storage tank 12 and the pressure feed pump 13 communicate with each other via a suction pipe 12a. The suction pipe 12 a is inserted deeply into each of the pair of water storage tanks 12, 12 and is branched at the center and connected to the pressure feed pump 13.

  The flow channel body 20 connects the pumping pump 13 of the fluid pressurization supply mechanism 10 and the injection port body 30, and includes four flow channel tubes 22,... Extending substantially vertically at a predetermined interval. The hose body 21 that connects each flow pipe 22 and the discharge port 13a of the pressure pump 13 is generally configured.

  The hose body 21 is formed of a flexible rubber or the like, and is branched in the horizontal direction at a substantially central position of the horizontal hose part 21b and a horizontal hose part 21b extending in the horizontal direction perpendicular to the traveling direction F. It has a connecting hose part 21a and four vertical hose parts 21c branched in the vertical direction at regular intervals along the longitudinal direction of the horizontal hose part 21b.

  In the connection hose portion 21a, the open end portion 21d (see FIG. 3) is connected to the discharge port 13a via a band or the like (not shown).

  And each vertical hose part 21c is extended toward the direction orthogonal to the connection hose part 21a and the horizontal hose part 21b, and the downward direction here. Moreover, the internal diameter of each vertical hose part 21c is thinner than the internal diameter of the connection hose part 21a and the horizontal hose part 21b.

  The channel tube 22 is formed of a straight tube material having a predetermined rigidity such as hard plastic or stainless steel, and is attached to the vertical hose portion 21c via a connection portion 23 provided at one end portion 22a. In addition, a thread groove 22c (see FIG. 8) is formed on the outer peripheral surface of the distal end portion 22b of the flow path tube 22 to which a rotation mounting body 32 (to be described later) of the injection port body 30 is screwed. In addition, the internal diameter of this flow path pipe 22 is thinner than the internal diameter of the vertical hose part 21c.

  Further, a positioning handle 24 is fixed to an intermediate portion of each flow channel tube 22, and a holding ring 25 (see FIG. 3) is attached between the positioning handle 24 and the tip 22b.

  As shown in FIG. 4, the holding ring 25 includes a ring portion 25a that is cracked in the axial direction, and flanges 25b and 25b that extend from the ring portion 25a. The holding ring 25 is fixed to the flow path tube 22 by tightening the flanges 25b and 25b with bolts and nuts 25c while sandwiching the flow path tube 22.

  Here, each flange 25b has a pair of recesses 25d, 25d with which a pair of rail pieces 26a, 26a of a C-shaped rail 26 described later is engaged, and a pin hole 25e extending coaxially with the flow path tube 22. Is formed. The pin hole 25e has a substantially cylindrical shape with the flanges 25b and 25b being fastened together.

  The rail 26 extends in a direction orthogonal to the flow path tube 22 and also in the traveling direction F. Rail pieces 26a and 26a facing each other are formed on the front side, and the upper surface thereof is formed. A plurality of fixing holes 26b,... Are formed at predetermined intervals along the longitudinal direction.

  This fixing hole 26b is used to adjust the position where the flow path pipe 22 is lowered to the intercostal space W. Any one of a plurality of fixing holes 26b,... Formed in the pin hole 25e and the rail 26 is used. After making a thing oppose, the fixing pin 27 is penetrated. Thereby, the holding ring 25 is fixed to a desired position of the rail 26.

  And this rail 26 is supported by the raising / lowering apparatus 40 mentioned later via the angle adjustment mechanism 43a mentioned later.

  The lifting device (height adjustment mechanism) 40 detects the water depth to the bottom surface Sa of the paddy field S, changes the support height of the rail 26 according to the detected water depth, and is held by the rail 26 from the bottom surface Sa. The distance to the injection port body 30 attached to the flow channel tube 22 is adjusted to be substantially constant.

  The lifting device 40 includes a device main body 41 fixed to a holding frame 3c that extends downward from the frame 3b, and a float 42 and an arm portion 43 attached to the device main body 41.

  The float 42 is held so as to be swingable with respect to the apparatus main body 41 via a float arm 42 a having a link mechanism. The float 42 floats on the paddy field S and swings in the vertical direction according to the unevenness of the bottom surface Sa of the paddy field S that changes as the traveling device 2 travels, that is, the water depth.

  The arm portion 43 is interlocked with the vertical movement of the float 42, and can swing in the vertical direction that moves in the opposite direction to the float 42 so that it lowers when the float 42 moves upward and rises when the float 42 moves downward. It has become. Here, it moves up and down by a gear mechanism (not shown) built in the apparatus main body 41. And the rail 26 is attached to the front-end | tip of this arm part 43 via the angle adjustment mechanism 43a.

  This angle adjusting mechanism 43a is arranged so that the rail 26 always faces a certain direction regardless of the vertical movement of the arm portion 43 (here, as shown in FIG. 1, the rail pieces 26a, 26a are directed forward in the traveling direction). ) Hold.

  On the other hand, as shown in FIG. 5, the ejection port body 30 includes an ejection port body 31 and a rotation mounting body 32 provided on the upper surface of the ejection port body 31.

  Here, as shown in FIG. 8, the rotational mounting body 32 is provided with a flanged cylindrical portion 32 b in which a screw portion 32 a that is screwed into the screw groove 22 c of the flow channel tube 22 is formed on the inner peripheral surface, and a bearing 32 c. And a presser plate 32d for rotatably mounting the flanged cylindrical portion 32b on the injection port main body 31. Then, when the screw groove 22c and the screw portion 32a are screwed together, the ejection port body 30 is rotatably fixed to the distal end portion 22b of the flow channel tube 22.

  The injection nozzle body 31 has a flat gear shape formed of a metal plate such as aluminum or stainless steel, and has a tooth tip portion 31b whose outer peripheral surface 31a is formed in an involute curve. The “outer peripheral surface 31a” is a tooth width surface that is a surface in the tooth width direction of the tooth tip portion 31b.

  Further, here, the injection port main body 31 has a trilobe gear shape having three tooth tip portions (convex portions) 31b,... And three tooth root portions (concave portions) 31c,. Further, the rotary mounting body portion 32 is fixed by screwing the flange portion 32 e of the presser plate 32 d to the center of one end face of the injection port main body 31.

  Here, the procedure for setting the gear shape of the injection nozzle main body 31 in the case of the intercostal space of 300 mm and the stock space of P180 mm will be described (see FIG. 6).

  First, the limit of the diameter of the injection port body 31 that can enter the intercostal space W is obtained by the equation (1). In this case, since the gap W is 300 mm, the diameter limit is 250 mm. The margin Y at this time can be set arbitrarily, but here it is 20 mm. The diameter of the rice stock K was 30 mm, which is the size of the standard rice stock K at the time of weeding.

Diameter limit of spray nozzle body = Washing W−Diameter of rice strain K−Margin Y
= 300 (mm) -30 (mm) -20 (mm)
= 250 (mm) (1)
Next, the circumference p of the pitch cycle diamond (PCD) that rolls along the line K ′ of the rice stocks K is determined by the equation (2). In this case, since it is a trilobe gear shape and the stock spacing P is 180 mm, the diameter of the PCD is 540 mm.

PCD circumference p = number of gear leaves x length of stock P
= 3 x180 (mm)
= 540 (mm) (2)
Subsequently, the diameter R of the PCD is obtained by Expression (3). In this case, the diameter R is 172 mm, and it can be seen that the diameter R is within the diameter limit of the injection nozzle body 31 obtained by the equation (1).

PCD diameter R = PCD circumference length / circumference ratio
= 540 (mm) ÷ 3.14
= 172 (mm) (3)
In the case where the injection port body 31 has a four-leaf gear shape, the PCD diameter R is 229 mm, which is almost the same size as the diameter limit of the injection port main body 31, so there is little margin. In the case of a five-leaf gear shape, the PCD diameter R Becomes 286 mm and does not fall within the diameter limit of the injection nozzle body 31. Therefore, in either case, it becomes inappropriate.

  Next, a module indicating the size of the teeth of the injection nozzle body 31 is obtained by the equation (4). In this case, the module is 57.3 mm.

Module = PCD diameter R / number of gear leaves
= 172 (mm) ÷ 3
= 57.3 (mm) (4)
Then, the diameter R ₁ of the addendum circle determined by equation (5), determine the diameter R ₂ of the root circle by equation (6), the diameter of the base circle determined by Equation (7). In addition, although the pressure angle (alpha) at this time can be set arbitrarily, it was 30 degrees here.

Tip circle diameter R ₁ = PCD diameter R + 1 × module
= 172 (mm) + 1 x 57.3 (mm)
= 229.3 (mm) (5)
Root diameter R ₂ = PCD diameter R + 0.5 × module
= 172 (mm) + 0.5 x 57.3 (mm)
= 200 (mm) (6)
Basic circle diameter = PCD diameter R × cos α
= 172 (mm) x 0.866
= 148.9 (mm) (7)
The gear shape of the injection nozzle body 31 is set based on the tip circle diameter R ₁ , the root circle diameter R ₂ , and the basic circle diameter obtained by the above procedure.

  Further, a flow passage 33 is formed in the injection port main body 31 and communicates with the flow channel tube 22 to flow the pressure fluid (here, water) that has flowed through the flow channel tube 20.

  As shown in FIG. 7, the flow path 33 includes an axial path 33 a that extends in the same direction as the rotational mounting body 32, and main paths 33 b that extend from the axial path 33 a toward the tip of each tooth tip portion 31 b. There are auxiliary paths 33c,... Extending from the shaft path 33a toward the respective tooth roots 31c, and a plurality of end paths 33d,.

  Note that the inner diameter of the flow passage 33 gradually decreases in the order of the axial route 33a, the main route 33b, the auxiliary route 33c, and the end route 33d. Here, the inner diameters of the auxiliary path 33c and the end path 33d are approximately the same size.

  And the front-end | tip of all the main paths 33b, the auxiliary | assistant path | route 33c, and the terminal path | route 33d is the injection port 34 open | released by the outer peripheral surface 31a of the injection-portion main body 31, respectively.

  Each injection port 34 is configured to inject water in a high-pressure state downward from the horizontal direction. Here, only the front end portion 33b ′ of the main path 33b is inclined downward, the auxiliary path 33c is inclined downward from the axial path 33a over the entire length (see FIG. 8), and the end path 33d is extended from the main path 33b. Inclined downward over the entire length (see FIG. 9), whereby water is jetted downward from each jet port 34.

  Furthermore, the tip 33b 'of the main path 33b is bifurcated to reduce the flow path area so that the flow rate of water flowing inside becomes faster.

  Next, the effect | action of the weeding apparatus 1 for paddy fields based on this invention is demonstrated.

  In order to use this paddy field weeding apparatus 1, first, the pair of water storage tanks 12 and 12 are filled with water.

  Here, the flow path pipe body 20 to which a plurality of injection port bodies 30 are attached is connected to the pressure feed pump 13 in advance. Further, the flow path tube body 20 is supported by the lifting device 40.

  Then, the traveling device 2 is driven to enter the paddy field S. At this time, as shown in FIG. 2, the steering wheel 5 and the pair of rear wheels 6, 6 are operated along the furrow W so that they do not come into contact with the rice plant K.

  On the other hand, each spray nozzle body 30 has a predetermined interval (here, a margin of Y20 mm) when the outer peripheral surface 31a of the tooth tip portion 31b faces the rice plant K, so that each spray nozzle body is in a state of being spaced apart. 30 positions in the rail 26 direction are adjusted.

  Here, in order to adjust the position of the injection nozzle body 30, first, the fixing pin 27 is removed, and the holding ring 25 is moved so that the distance between the outer peripheral surface 31a of the tooth tip portion 31b and the rice plant K becomes the predetermined interval. Move along the rail 26. And the pin hole 25e and the arbitrary fixing holes 26b are made to oppose, and the fixing pin 27 is penetrated. Thereby, the position of the injection nozzle body 30 can be fixed to a desired position.

  At this time, since the hose body 21 of the flow path tube body 20 is formed of flexible rubber or the like, the hose body 21 is deformed following the movement of the holding ring 25, and the holding ring 25 is While being able to move smoothly, a pipe line does not obstruct | occlude.

  In addition, about the height position of the injection nozzle body 30, the distance with the bottom face Sa of the paddy field S is arbitrarily set previously. When the traveling device 2 travels, the height of the rail 26 is automatically changed by the lifting device 40 so that the distance from the bottom surface Sa of the injection nozzle body 30 is adjusted to be constant. .

  At this time, since the rail 26 is supported by the arm portion 43 of the lifting device 40 via the angle adjustment mechanism 43a, the rail 26 is always directed in a certain direction regardless of the support height (here, in FIG. As shown, the rail pieces 26a, 26a are held in a state of facing forward in the traveling direction.

  And while driving | running | working the traveling apparatus 2 along the furrow W, the prime mover 14 is driven and the pumping pump 13 is operated. The operated pumping pump 13 simultaneously sucks up substantially the same amount of water from both of the pair of water storage tanks 12 and 12 through the suction pipe 12a, applies pressure to the high pressure state, and then supplies the water to the hose body 21.

  The high-pressure water supplied from the pressure pump 13 flows from the hose body 21 to the flow path tube 22, and passes through the flow passage 33 formed in the inside of the injection port body 30 from the tip 22 b of the flow path pipe 22. It is injected from a large number of injection ports 34.

  As a result, the spray port body 30 moves in the direction indicated by the arrow F in FIG. 1 along the line of the rice stock K while spraying the high-pressure water supplied from the pumping pump 13 from the spray port 34.

  Here, the injection port body 30 is rotatably attached to the flow path tube 22 via a rotary mounting body 32, and can be rotated in a horizontal plane even in use.

  And since the water jetted from the jet nozzle 34 is jetted downward from the horizontal direction, water is sprayed toward the roots of the weeds generated in the inter-strain P, and the roots of the weeds are rinsed and washed into the water. Can be weeded by floating. Further, weeds generated in the intercostal spaces W can be sprayed with water toward the roots and suspended in the water, so that weeding can be reliably performed.

  Thus, in the injection nozzle body 30 of the above-mentioned embodiment, weeds generated in the inter-strain P and the intercostal space W can be removed smoothly and easily. In particular, weeds up to the second leaf stage have weak rooting power and can be easily floated by the pressure of water in a high pressure state.

  Further, as the traveling device 2 travels along the intercostal space W, the jet nozzle body 30 also moves along the intercostal space W. When the outer peripheral surface 31a of the tooth tip portion 31b comes into contact with the rice stock K along with the movement of the jet nozzle body 30, the jet force body 30 moves in the direction opposite to the moving direction due to the contact force generated between the rice stock K. It rotates in the direction away from the rice stock K. Therefore, the contact force between the spray nozzle 30 and the rice stock K can be weakened, and damage to the rice stock K can be reduced.

  Here, since the inner diameter of the hose body 21 and the horizontal hose part 21b, the vertical hose part 21c, the flow path pipe 22 and the connecting hose part 21a are gradually narrowed, the flow rate of water flowing through the hose body 21 is gradually increased. Is hardly reduced. Further, the inner diameter of the flow path 33 is also gradually reduced in the order of the axial path 33a, the main path 33b, the auxiliary path 33c, and the end path 33d, so that a decrease in water pressure is prevented and water is ejected vigorously from the injection port 34. be able to. Therefore, the soil covering the roots of weeds can be sufficiently removed.

  Further, the water sprayed from the spray body 30 exerts a reaction force in a direction that separates the spray body 30 from the rice plant K. For this reason, the contact force at the time of the spray nozzle body 30 contacting the rice stock K reduces, and it becomes possible to further suppress the damage of the rice stock K.

  In addition, the influence which water and the injection nozzle body 30 have on the rice stock K can further be reduced by adjusting the injection pressure of the water supplied from the pumping pump 13.

  Further, since the injection port body 30 is attached to the flow path tube body 20 by screwing the screw portion 32a of the rotary mounting body 32 and the thread groove 22c of the flow path tube 22, it can be easily removed. In addition, it is possible to easily replace the spray body 30 of any size according to the size of the intercostal space W or the stock space P.

  Moreover, in the above-mentioned embodiment, the injection port body 30 is a flat gear shape, and the outer peripheral surface 31a is a tooth tip portion 31b formed in an involute curve.

  As a result, when the injection port body 30 moves and rotates in a horizontal plane, the injection port body 30 and the rice stock K appear to be engaged with the gear and the sprocket. The front part 31b can easily enter and exit.

  Therefore, water can be sprayed vigorously toward the roots of the weeds generated in the inter-strain P, and the weeds generated in the inter-strain P can be sufficiently removed.

  Moreover, in the above-mentioned embodiment, the injection nozzle body 30 is exhibiting the trilobe gear shape. Therefore, when the interval between the stocks P is generally spread, that is, when the stock P is 180 mm, the amount of the tooth tip portion 31b of the spray nozzle body 30 entering the stock P can be increased. The body 30 will penetrate deeply into the stock P.

  Accordingly, water can be sprayed in the vicinity of the weeds generated in the inter-strain P, so that the inter-strain P can be weeded more reliably.

  In the above-described embodiment, the fluid pressure supply mechanism 10 and the channel tube 20 are mounted on the traveling device 2, and the channel tube 22 of the channel tube 20 is ejected from the injection port body 30 by the lifting device 40. And the bottom surface Sa of the paddy field S are supported so as to be constant.

  Thereby, by traveling the traveling device 2 along the intercostal space W, the intercostal space W can be moved along the direction in which the rice stocks K are arranged in the spray port body 30 attached to the flow path tube body 22. Therefore, high-pressure water can be ejected while the ejection port body 30 is easily moved, and the weeding work of the inter-strain P can be facilitated.

  In the above-described embodiment, the flow channel body 20 has the four flow channel tubes 22, and the injection port body 30 is attached to each tip portion 22b.

  Thereby, it becomes possible to perform the weeding operation | work of the several intercostal space W and the stock | strain P simultaneously by adjusting the mutual space | interval of the four flow path pipes 22 and ... so that it may match with the magnitude | size of the intercostal space W.

  Further, since the flow path pipe 22 is supported via the lifting device 40, the distance from the jet body 30 to the bottom surface Sa of the paddy field S is constant, and is always directed to the roots of the weeds regardless of the unevenness of the bottom surface Sa. High pressure water can be injected, and weeding can be reliably performed.

  As mentioned above, although embodiment concerning this invention has been explained in full detail with drawing, a concrete structure is not restricted to the above-mentioned embodiment. Design changes and the like within the scope not departing from the gist of the present invention are included in the present invention.

  For example, in the above-described embodiment, the injection port main body 31 has a gear shape formed of a metal plate, but a pipe is bent along the gear shape like the injection port body 50 shown in FIG. It may be formed in a ring shape.

  In the injection port body 50, a shaft tube 51 that is rotatably mounted on the flow channel tube 22, and a plurality (three in this case) of connecting tubes 52 that extend radially from the outer peripheral surface of the shaft tube 51, Each of the connecting pipes 52 has a ring-shaped pipe 53 which is welded in communication with the connecting pipe 52 and surrounds the periphery of the connecting pipe 52.

  The shaft tube 51 has a plurality of (three in this case) flow holes 51b,... Communicating with the respective connection tubes 52 on the peripheral surface 51a, and the rotational mounting body 32 in the above-described embodiment is provided at the upper end (not shown). Has the same mechanism.

  One end of the connecting pipe 52 is welded and fixed to the peripheral surface 51 a of the shaft pipe 51, and the other end is welded and fixed to the inner peripheral face 53 a of the ring-shaped pipe 53.

  The ring-shaped tube 53 is formed of an annular hollow pipe, and is bent so that the outer peripheral surface 53b has a trilobal gear shape having a tooth tip portion forming an involute curve. Further, a plurality (three in this case) flow holes 54a,... Communicating with the connecting pipe 52 are formed on the inner peripheral surface 53a of the ring-shaped pipe 53, and a large number of circumferential holes 53 are arranged on the outer peripheral face 53b. An injection port 55 is formed.

  Here, the “inner peripheral surface” is a surface facing the axial tube 51 in the outer peripheral surface of the ring-shaped tube 53, and the “outer peripheral surface” is facing outward in the outer peripheral surface of the ring-shaped tube 53. Surface.

  Even in this case, weeds generated in the inter-strain P can be sufficiently removed, and damage to the rice plant K can be suppressed.

  Furthermore, since the spray port body 50 can be lighter than the spray port body 30 in the above-described embodiment formed by a metal flat plate, the impact on the rice stock K can be reduced, the flow path tube body 20 and the like. The burden on the lifting device 40 can be reduced.

  Furthermore, in the above-described embodiment, pressurized water is used as the pressure fluid, but air may be used, for example.

  In this case, a compressor can be used as a pressure pump, and air can be sucked and supplied from the atmosphere. This eliminates the need for a water storage tank.

  Further, the water in the paddy field S may be used as the water supplied by being pressurized by the pressure pump 13. In this case, it is desirable to apply pressure and supply after allowing the filter or the like to pass through so as not to suck the earth and sand in the paddy field S.

  In the above-described embodiment, the fluid pressurizing and supplying mechanism 10, the flow path tube body 20, and the injection port body 30 are mounted on the traveling device 2 that can be driven by the driver and travel in the paddy field S. However, it is not limited to this.

  For example, the fluid pressure supply mechanism 10 and the like may be mounted on a handcart type walk-behind mobile farm machine in which an operator moves while holding the operation handle. In this case, even a small paddy field that does not contain the traveling device 2 can be easily routed.

  Furthermore, as the paddy field weeding apparatus according to the present invention, a so-called shoulder-type manual sprayer may be provided with an injection nozzle 30 attached to the tip.

  Even in this case, the weeds can be suspended and removed in the water by the water injection pressure, and the burden of weeding work can be reduced.

  And in the above-mentioned embodiment, each jet port 34 of the jet port body 30 opens to the outer peripheral surface 31a of the jet port main body 31, and the flow passage 33 is inclined downward, so that the water is lower than the horizontal direction. However, the present invention is not limited to this.

  The ejection port 34 may be formed on the bottom surface of the ejection port body 31, that is, the surface facing the bottom surface Sa of the paddy field S. Even in this case, since water can be sprayed toward the roots of the weeds, it is possible to blow away the soil covering the roots of the weeds and remove the weeds so as to float in the water.

It is a side view which shows the traveling apparatus carrying the weeding apparatus for paddy fields based on this invention. It is a top view which shows the traveling apparatus shown in FIG. It is a perspective view which shows the principal part of the weeding apparatus for paddy fields shown in FIG. It is an enlarged view of the A section in FIG. It is a perspective view which shows the external appearance of a jet nozzle body. It is explanatory drawing for demonstrating the setting procedure of the shape of a jet nozzle. It is explanatory drawing which shows the flow path formed in the injection nozzle body shown in FIG. It is BB sectional drawing in FIG. It is CC sectional drawing in FIG. It is a horizontal sectional view which shows the other example of the injection nozzle of the weeding apparatus for paddy fields based on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Paddy field weeding device 10 Fluid pressurization supply mechanism 20 Flow path pipe body 30 Injection port body 33 Flow path 34 Injection port

Claims (5)

A paddy weeding device that sprays a pressure fluid into the paddy field and weeds,
A fluid pressurization supply mechanism for supplying the pressure fluid, a flow passage tube communicating with the fluid pressurization supply mechanism, and an injection port body rotatably attached to the flow passage tube,
The spray body is rotatable in a horizontal plane when in use, and is connected to the flow path tube body to flow the pressure fluid, and is connected to the flow path so as to be lower than the horizontal direction. A weeding device for paddy fields, characterized by having an injection port for injecting the pressure fluid toward the surface.   The injection port body has a flat gear shape and has a tooth tip portion formed in an involute curve, and the injection port is formed on a tooth width surface or a lower surface of the tooth tip portion. The weeding apparatus for paddy fields according to claim 1.   The paddy field weeding device according to claim 2, wherein the spray body has a trilobe gear shape. The injection port body includes a ring-shaped tube formed by bending a pipe so that the outer peripheral surface exhibits a trilobe gear shape formed in a plan view involute curve,
The weeding apparatus for paddy fields according to claim 1, wherein the injection port is provided on an outer peripheral surface of the ring-shaped tube. A paddy field weeding travel device comprising the paddy field weeding device according to any one of claims 1 to 4,
A vehicle body mounted with the pressurized fluid supply mechanism and the flow path pipe body, and a height adjustment mechanism for adjusting a distance from a bottom surface of a paddy field to the ejection port body; A weed traveling device for paddy fields.

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