JP4038538B2 - Weeder - Google Patents

Description

  The present invention relates to a weeding machine, and more particularly, to weeding weeds that grow around seedlings planted in paddy fields.

Conventionally, a weeding device 1 as shown in FIG. 6 is disclosed in Japanese Patent Application Laid-Open No. 2002-204603 as a device for weeding a weed growing around a seedling of a paddy field.
The weeding device 1 travels by rotating a wheel 3 by a drive source 2 and is provided with a weeding part 4 in front of the wheel 3 and pulling the riding part 5 in the rear. The weeding unit 4 includes a rotary weeding mechanism 6 that protrudes radially from the slats, a weeding rotor 7 that is disposed behind the rotating weeding mechanism 6, and a warp unit 8 that is disposed in front of the rotating weeding mechanism 6. .
The operator travels on the riding part 5 of the weeding device 1 while operating the steering wheel, scrapes out the weeds with the rotary weeding mechanism 6 and weeds the weeds that have not been weeded by the rotating weeding mechanism 6. By pushing it into the soil and killing it.

However, in the case of the weeding device 1, since the weeding unit 4 is fixedly provided to the airframe, there is a problem that the ground pressure of the weeding unit 4 on the soil cannot be adjusted. Although the sled portion 8 can follow the weed portion 4 to some extent by sliding on the soil surface, in order to reliably weed weeds according to the field conditions, when the top soil is hard, the ground pressure is increased. When the topsoil is soft, it is desirable that the ground pressure can be reduced.
JP 2002-204603 A

  The present invention has been made in view of the above problems, and it is an object of the present invention to make it possible to adjust the contact pressure of the weeding means to the soil so that weeding can be reliably performed even under different field conditions.

In order to solve the above-mentioned problems, the present invention attaches a weeding means for grounding the soil surface to the body supported by the wheels via a link member, and attaches the link member to the piston portion of the cylinder that supports the body. Connected so that the weeding means can move up and down with respect to the airframe, and the weeding means is suspended by being connected to the lower end of a tension spring whose upper end is connected to the airframe side,
The above herbicidal means provides a herbicidal machine, characterized in that it is configured to prevent excessive vertical vibration by the cylinder while allowing follow the soil surface by the expansion and contraction of the tension spring during weeding.

With the above configuration, the weeding means is suspended from the aircraft by a tension spring, so even if the soil cultivator (layer where the wheel does not sink) has irregularities and the aircraft moves up and down or the soil surface has irregularities, By the expansion and contraction action of the tension spring, the weeding means follows the undulations on the soil surface, and an appropriate ground pressure is maintained, so that weeding can be performed reliably.
In addition, the weeding means and the aircraft are connected by a link member, and the link member is connected to a piston portion of a cylinder supported by the aircraft so that the weeding means can be moved up and down with respect to the aircraft. Since the weeding means is loaded, excessive vertical vibrations can be prevented from being generated by the cylinder while being able to follow the soil surface by the expansion and contraction of the tension spring.

  It is preferable that the airframe includes a position adjusting means for adjusting the position of the upper end of the tension spring, and the position adjusting means can adjust the contact pressure on the soil surface of the weeding means by moving the tension spring up and down. .

  With the above configuration, the contact pressure on the soil of the weeding means can be changed by raising and lowering the tension spring by the position adjusting means, so the contact pressure is optimal according to the topsoil hardness, depth and soil conditions of the field. Therefore, weeding can be performed reliably even under various field conditions. For example, if the topsoil of the field is hard, the tension spring is lowered by the position adjusting means to increase the contact pressure on the soil surface of the weeding means, and if the topsoil of the field is soft, the tension spring is raised and the weeding means Weeding can be suitably performed by reducing the contact pressure on the soil surface.

Weeding the weeds that grow in paddy fields where multiple seedlings are planted,
The above weeding means presses and fills the weeds between the strips with a sled or / and a pressure-reducing rotor grounded on the soil surface, and the seedlings of the same strip with rotating blade members or / and spring claws in which a plurality of blades protrude radially. It is structured to scrape weeds between them and weed them.

With the above configuration, weeds between the rows of seedlings that have been planted can be buried in the soil of paddy fields with the above-mentioned sled and repressing rotor, and can be killed, and they grow between the seedlings of the same row (between strains) and the surrounding area. Weeds can be weeded by scraping from the soil with rotating blade members or spring claws.
Also, if the ground pressure of the weeding means is too low, it will be insufficient to scrape weeds or cover the weeds with soil, while if the ground pressure is too high, the weeding means will dive deeply into the soil and damage the seedlings. However, according to the present invention, it is possible to prevent seedling damage while maintaining herbicidal performance by optimizing the contact pressure of the weeding means to the soil surface.

As is apparent from the above description, according to the present invention, the weeding means is suspended by a tension spring, and the weeding means and the airframe are connected by a link member and the link member is supported by the airframe. It is connected to the piston part so that weeding means can be moved up and down with respect to the airframe, so even if there is unevenness on the soil cultivator or soil surface, it absorbs the undulations and keeps the ground pressure constant. In addition, weeding can be performed , and excessive vertical vibrations can be prevented . Also, in response to the surface soil hardness, depth, and soil conditions of the field, by adjusting the contact pressure of the weeding means to the soil optimally by raising and lowering the tension spring by the position adjusting means, in various field conditions Weeding work can be performed reliably.

Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a four-row weeding machine 10 for weeding seedlings grown around seedlings planted in paddy fields.
The weeding machine 10 is a riding type, and the front wheel 12 and the rear wheel 13 that support the machine body 11 that runs longitudinally are rotated by a motor 17, and the steering handle 25 and the driver's seat 14 are provided at the center of the rear part of the machine body 11. ing.

  Between the front wheel 12 and the rear wheel 13, a weeding means 14 is attached to the airframe 11 so as to be movable up and down via a link member 39 and a hydraulic cylinder 40, and the weeding means 14 is suspended by a tension spring 16, An upper end hook portion 16 a of a tension spring 16 is attached to the position adjusting means 15 fixed to the body 11.

  The weeding means 14 can be moved up and down via a base 20 to which the tension spring 16 and the link member 39 are connected, a frame 21 extending in the front-rear direction below the base 20, and a link 21 on the frame 21. A connected sled 22, a spring claw 23 made of a metal rod having elasticity formed to project obliquely rearward from both sides of the sled 22, a rotary blade member 24 fixed to the frame 21 via an attachment piece 29, A pressure reducing roller 27 fixed to the frame 21 via an attachment piece 30 is provided.

  The sled 22 warps the front end 22a upward, and the rear end 22b is inclined obliquely downward to form a knurled claw. The height of the sled 22 can be adjusted by changing the angle of the mounting piece 28 with the angle adjusting rod 43 attached to the link-shaped mounting piece 28.

  The rotary blade members 24 are arranged in two pairs in the front and rear of the slant 22 obliquely, a rotary shaft portion 26 that is rotatably connected to the lower end of the mounting piece 29, and a plurality of sheets that project radially from the rotary shaft portion 26. , And the axial direction of the rotary shaft portion 26 is inclined inward as shown in FIG. The wing plate portion 25 protrudes downward from the rotating shaft portion 26, protrudes obliquely upward from the lower end portion 25a to the tip end portion 25b, and is curved in the circumferential direction.

The pressure-reducing rotor 27 is disposed behind the sled 22 and obliquely behind the rotary blade member 24. As shown in FIGS. 1 and 4, a plurality of rods 46 are provided between the disk-shaped side surfaces 44, 45. A cage is formed by forming a virtual cylinder by arranging the circumferentially spaced apart sides, and both side surfaces 44 and 45 are rotatably attached to the attachment piece 30. As shown in FIG. 4, among the plurality of pressure-reducing rotors 27 arranged in the left-right direction, the one disposed on both sides is an asymmetric pressure-reducing rotor 27B, and the other is a symmetrical pressure-reducing rotor 27A.
The asymmetric pressure-reducing rotor 27B has a relationship of d1> d2, where d1 is the distance from the center line C of the front sled 22 to the inner side surface 45 and d2 is the distance from the center line C of the sled 22 to the outer side surface 44. Thus, the amount of outward protrusion of the asymmetric pressure suppressing rotor 27B is reduced so that it does not protrude outward from the outer edge of the front sled 22.

  The position adjusting means 15 rotatably fixes a screw shaft 32 having a screw engraved on the outer periphery to a housing 31 fixed to the airframe 11 via a bracket portion 31 a, and an adjustment handle 33 at the upper end of the screw shaft 32. , And the lifting / lowering rod 34 with the screw shaft 32 fitted and screwed is projected below the housing 31, and the adjustment shaft 33 is rotated to rotate the screw shaft 32, whereby the lifting / lowering rod 34 is lifted and lowered. Structure. Further, the lower ends of the first tilting piece 35 and the second tilting piece 36 are rotatably fixed to the body 11 by a fixed shaft 38, and the first tilting piece 35 and the second tilting piece 36 are The structure is tilted with the fixed shaft 38 serving as a fulcrum while the crossing angle remains unchanged.

The tension spring 16 connects the upper end hook part 16 a to the protrusion part 36 a at the tip of the second tilting piece 36 and connects the lower end hook part 16 b to the protrusion part 20 a of the base part 20 of the weeding means 14.
The hydraulic cylinder 40 has an upper end fixed to the airframe 11, and a fixed portion 42 at the lower end of the piston portion 41 is connected to the link member 39. The link member 39 has a rear end rotatably attached to the connecting portion 11 a of the body 11 and a front end rotatably attached to the connecting portion 20 b of the base 20 of the weeding means 14.

Next, weeding work using the weeder 10 will be described.
The operator lowers the weeding means 14 by turning the adjustment handle 33, and adjusts the ground pressure according to conditions such as the hardness of the soil surface DH of the paddy field. Specifically, as shown in FIG. 2, when the adjustment handle 33 is turned, the elevating rod 34 is lowered, and the second tilting piece 36 is also moved as the first tilting piece 35 tilts downward with the fixed shaft 38 as a fulcrum. It tilts and the protrusion 36a at the upper end moves downward. As a result, the position of the upper end hook portion 16a of the tension spring 16 also moves downward, so that the weeding means 14 is lowered and grounded to the soil surface DH. The link member 39 tilts downward while maintaining parallelism, and the piston portion 41 of the hydraulic cylinder 40 is also lowered, and the hydraulic cylinder 40 is connected to prevent the weeding means 14 from violently vibrating up and down.

In a state where the warp 22 of the weeding means 14 is grounded, the spring claw 23, the rotary blade member 24, and the pressure-reducing rotor 27 are slightly submerged from the soil surface DH.
At this time, if the adjustment handle 33 is turned to lower the weeding means 14 and stop when the sled 22 starts to contact the ground, the contact pressure becomes about zero, but if the adjustment handle 33 is further turned to lower the tension spring 16, weeding The ground pressure of the means 14 is increased, and the total weight of the weeding means 14 is loaded on the soil surface DH in a state where the tensile force applied to the tension spring 16 becomes zero (the amount of extension is zero). That is, the ground pressure is adjusted in accordance with conditions such as hardness and depth of the soil surface DH below the water surface S. When the ground pressure is not enough even with the total weight of the weeding means 14, it is preferable to place a weight on the weeding means 14.

  As shown in FIG. 4, the warp 22, the symmetrical pressure-reducing rotor 27 </ b> A, and the asymmetric pressure-reducing rotor 27 </ b> B are disposed between the lines of the seedling N, and the rotary blade member 24 and the spring claw 23 It is arranged at a position to be sandwiched from the direction. Therefore, by running the weeder 10, weeds between the streaks can be buried and killed by the sled 22, the symmetrical pressure-reducing rotor 27 </ b> A, and the asymmetrical pressure-reducing rotor 27 </ b> B. The weeds between the seedlings N can be scraped and weeded.

  As shown in FIG. 3, the rotary blade member 24 is pivotally supported in an inwardly inclined state facing the left and right, and the inner wing plate portion 25 contacts the soil surface DH when the weeder 10 travels. Thus, it rotates spontaneously, and the weed Z having a shallow root is scraped out on the surface of the slat portion 25.

  In addition, as shown in FIG. 2, when the soil tiller DK on which the front wheels 12 and the rear wheels 13 travel has unevenness and the machine body 11 moves up and down or the soil surface DH has unevenness, The ground pressure of the weeding means 14 is likely to be unstable. In the present invention, the ground pressure is stabilized by adjusting the vertical position of the tension spring 16 by the position adjusting means 15 and the vibration absorbing action of the tension spring 16. The sled 22 follows the soil surface DH. Therefore, the sled 22, the spring claw 23, the rotary blade member 24, and the pressure reducing rotor 27 are prevented from being deeply submerged and damaging the seedling N, and the rotary blade member 24 accurately scrapes only the weeds Z. Weeds can be reliably covered with soil.

In addition, as shown in FIG. 5, when four seedlings N are planted by the rice transplanter, the interval J1 in the transplant units T1 and T2 is constant depending on the setting of the rice transplanter, but the transplant unit T1 The adjacent streak J2 that is the distance between the transplant unit T2 becomes narrower or wider due to the operation when the rice transplanter is reciprocated.
However, the asymmetric pressure-reducing rotors 27B on both sides of the weeder 10 reduce the distance d2 from the center line C to the outside as described above. Therefore, even when the adjacent streak J2 is narrow, the adjacent streak N will not be stepped on by the asymmetric pressure reducing rotor 27B.

  In addition, even when there is a region where the adjacent strip J2 is wide and the asymmetric suppression rotor 27B has not been fully suppressed due to a small amount of protrusion in the both sides, when the weeder 10 is reciprocated after all, The asymmetric pressure-reducing rotor 27B passes through the region, and as a result, no non-passing region is generated.

It is a side view of the weeder of the embodiment of the present invention. It is a side view after position adjustment of the weeding means of a weeder. It is drawing explaining the effect | action of a rotary blade part. It is a top view at the time of driving | running | working of a weeder. It is a top view which shows the reciprocation of a weeder. It is drawing which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Weeder 11 Machine body 12 Front wheel 13 Rear wheel 14 Weeding means 15 Position adjusting means 16 Tension spring 16a Upper end hook part 16b Lower end hook part 17 Motor | power_engine 18 Steering handle 19 Driver's seat 20 Base part 20a Protrusion part 21 Frame 22 Sleigh 23 Spring claw 24 Rotation Blade member 25 Blade plate portion 25a Lower end portion 25b Tip portion 26 Rotating shaft 27 Pressure reducing rotor 27A Symmetric pressure reducing rotor 27B Asymmetric pressure reducing rotor 28-30 Bracket 31 Housing 32 Screw shaft 33 Adjustment handle 34 Lifting bar 35 First tilting piece 36 Second tilting Piece 36a Protruding part 37 Mounting shaft 38 Fixed shaft 39 Link member 40 Hydraulic cylinder 41 Piston part 42 Fixed part DH Soil surface DK Soil tiller N Seedling S Water surface Z Weed

Claims (3)

A weeding means for performing weeding by grounding on the soil surface is attached to the airframe supported by the wheels via a link member, and the link member is connected to a piston portion of a cylinder supported by the airframe to connect the weeding means to the airframe. It is possible to move up and down, and the weeding means is suspended by being connected to the lower end of a tension spring whose upper end is connected to the body side,
The weeding machine characterized in that the weeding means is configured to prevent excessive vertical vibration from being generated by the cylinder while being able to follow the soil surface by extension and contraction of the tension spring during weeding.   The said body is equipped with the position adjustment means to adjust the position of the upper end of the said tension spring, It is set as the structure which can adjust the ground pressure to the soil surface of the said weeding means by raising and lowering the said tension spring by this position adjustment means. The weeder according to 1. Weeding the weeds that grow in paddy fields where multiple seedlings are planted,
The weeding means presses and fills the weeds between the strips with a sled or / and a pressure-reducing rotor grounded on the soil surface, and the seedlings of the same strip with rotating blade members or / and spring claws in which a plurality of blades protrude radially. The weeding machine according to claim 1, wherein the weeding machine is configured to scrape weeds in between.

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