JP2023142401A - Traction type work device and work vehicle - Google Patents

Abstract

To provide a traction type work device in which maintainability of a device body can be improved, and a work vehicle.SOLUTION: A traction type work device 1 includes a device body 3. The device body 3 is connected to a vehicle body of a work vehicle and towed by the vehicle body. The vehicle body 3 includes a work unit (dissemination unit 5) and a support part 7 that supports the work unit. The support part 7 supports the work unit in a rotatable manner between a first posture in which a target surface 50 of the work unit faces further upward than the horizontal and a second posture in which the target surface 50 faces further downward than the horizontal.SELECTED DRAWING: Figure 13

Description

TECHNICAL FIELD The present invention relates to a towed working device and a working vehicle, which include a device main body that is connected to a vehicle main body of a working vehicle and towed by the vehicle main body.

As a related technique, a towed working device is known that includes a device main body such as a wheel mark erasing device and a working unit (direct sowing device) that are connected to the rear side of a working vehicle (see, for example, Patent Document 1). In related technology, a connecting mechanism such as a three-point link mechanism that can freely connect a device body (wheel mark erasing device, etc.) is provided on the rear side of the vehicle body (vehicle body part) of a work vehicle. As a result, the main body of the device (wheel mark erasing device, etc.) is installed on the work vehicle.

A device main body (wheel mark erasing device) of a towed working device according to related technology includes a pair of left and right earth shoring bodies. The pair of left and right earth-filling bodies are configured in an inclined posture such that the rear portions are closer to each other in the left-right direction. According to this towed work device, it is possible to erase wheel marks by gathering soil with a pair of left and right earth collecting bodies at a location where the wheels of a work vehicle such as a tractor have passed. Further, as the vehicle body moves forward, the work unit discharges the seeds stored in the hopper little by little and directly sows the seeds in the field.

JP2020-18248A

In the configuration of the above-mentioned related technology, the posture of the device main body with respect to the vehicle main body is fixed, so if, for example, maintenance is performed by discharging all the seeds remaining in the hopper after work is completed, it takes time and effort to discharge the seeds. , maintenance of the device itself can be time-consuming.

An object of the present invention is to provide a towed working device and a working vehicle that can improve the maintainability of the device body.

A towed working device according to one aspect of the present invention includes a device main body. The device main body is connected to a vehicle main body of a work vehicle and is towed by the vehicle main body. The device main body includes a working unit and a support portion that supports the working unit. The support section is configured to allow the work unit to rotate between a first attitude in which the target surface of the work unit is directed above the horizontal, and a second posture in which the target surface is directed below the horizontal. To support.

A work vehicle according to another aspect of the present invention includes the towed work device and the vehicle body.

According to the present invention, it is possible to provide a towed working device and a working vehicle that can improve the maintainability of the device main body.

FIG. 1 is a schematic left side view of the entire work vehicle according to the first embodiment. FIG. 2 is a schematic perspective view of the towed working device according to the first embodiment, viewed from the upper left rear. FIG. 3 is a schematic perspective view of the towed working device according to Embodiment 1, viewed from the lower right front. FIG. 4 is a schematic plan view of the towed working device according to the first embodiment. FIG. 5 is a schematic bottom view of the towed working device according to the first embodiment. FIG. 6 is a schematic left side view of the front side portion of the towed working device according to the first embodiment. FIG. 7 is a schematic left side view of the rear portion of the towed working device according to the first embodiment. FIG. 8 is a schematic rear view of one seeding unit of the towed working device according to the first embodiment. FIG. 9 is a schematic plan view showing the field after the towed working device according to the first embodiment has passed. FIG. 10 is a schematic left side view showing the lowering operation of the device main body in the towed working device according to the first embodiment. FIG. 11 is a schematic left side view showing the lifting operation of the device main body in the towed working device according to the first embodiment. FIG. 12 is a schematic perspective view showing a state in which one seeding unit in the towed working device according to the first embodiment is in the second attitude. FIG. 13 is a schematic left side view showing a state in which one seeding unit in the towed working device according to the first embodiment is in the second attitude.

Embodiments of the present invention will be described below with reference to the accompanying drawings. The following embodiment is an example embodying the present invention, and is not intended to limit the technical scope of the present invention. Further, in the accompanying drawings, illustrations of fasteners such as screws, bolts, or nuts, various cover members, and detailed shapes of each part are omitted as appropriate.

(Embodiment 1)
[1] Overall Configuration First, the overall configuration of the work vehicle 10 according to the present embodiment will be described with reference to FIG. 1. The towed working device 1 according to the present embodiment constitutes a working vehicle 10 together with a vehicle body 2 of the working vehicle 10. That is, the work vehicle 10 includes a towed work device 1 (hereinafter also simply referred to as “work device 1”) and a vehicle body 2.

The working device 1 includes a device main body 3 and a coupling device 4. The device body 3 is connected to the vehicle body 2 of the working vehicle 10 and is towed by the vehicle body 2. The connecting device 4 connects the device main body 3 and the vehicle main body 2. Here, the coupling device 4 couples the device body 3 to the rear side of the vehicle body 2 (on the opposite side to the forward direction of the vehicle body 2). That is, the (traction type) working device 1 is a device that is connected to the rear side of the vehicle body 2 and moves forward together with the vehicle body 2 so as to be towed by the vehicle body 2 when the vehicle body 2 moves forward. Particularly in this embodiment, the work device 1 does not have its own power source that generates power, and performs work using the force of being pulled by the vehicle body 2.

A "work vehicle" in the present disclosure means a vehicle that performs various works in a work area such as field G1, and includes, for example, a tractor, a seeding machine, a rice transplanter, a spreader, a sprayer, a transplanter, and a harvester. These are agricultural machinery (agricultural machinery) such as The work vehicle 10 may be, for example, a construction machine. In this embodiment, unless otherwise specified, a case where the work vehicle 10 is a riding type tractor equipped with a seeding machine will be described as an example. That is, the working vehicle 10 is configured by connecting the working device 1, which is a seed sowing machine, to a tractor, which is a vehicle main body 2, in a towable state. In this work vehicle 10, by driving the vehicle body 2 through a work area such as the field G1, it is possible to sow crop seeds on the trajectory of the vehicle body 2 in the work area. Further, in this embodiment, as an example, the work vehicle 10 is operated by human (operator) operation (including remote control), but the present invention is not limited to this. It may be a machine.

A "field" in the present disclosure is a work area in which the work vehicle 10 performs various operations such as sowing, fertilizing, spraying pesticides, planting (rice planting), or harvesting while moving, and includes paddy fields to grow, fields, etc. , including orchards and pastures. For example, when the field G1 is a paddy field or field in which crops (agricultural products) such as rice, wheat, soybeans, or buckwheat are grown, the crops grown in the field G1 are agricultural products. Furthermore, when plants are grown in a garden field, the garden field becomes the field G1, and when trees that become lumber are grown in a forest, such as in forestry, the forest becomes the field G1. In this case, the crops grown in the field G1 are plants, trees, etc. In this embodiment, unless otherwise specified, the working vehicle 10 is used for sowing rice seeds (rice seeds), and the field G1 is a paddy field for growing rice. Furthermore, the work area is not limited to the field G1; for example, if the work vehicle 10 is a construction machine, the work area is the site where the construction machine performs work.

In this embodiment, for convenience of explanation, the vertical direction when the work vehicle 10 is in a usable state is defined as the up-down direction D1. A front-rear direction D2 and a left-right direction D3 (see FIG. 2) are defined based on the direction seen from the person (operator) riding on the vehicle body 2 (driving unit 21 of) of the work vehicle 10. The left side in the left-right direction D3 refers to the left side when the vehicle body 2 is driven forward (forward), and the right side in the left-right direction D3 refers to the right side when the vehicle body 2 is driven forward (forward). The outer side in the left-right direction D3 refers to the outer side of the work vehicle 10 in the left-right direction D3, and the inner side in the left-right direction D3 refers to the inner side of the work vehicle 10 in the left-right direction D3. However, these directions are not intended to limit the directions in which the work vehicle 10 and the work device 1 are used (directions during use).

The vehicle body 2 has a driving section 21, front wheels 22, and rear wheels 23. The vehicle body 2 further includes a power source (engine, motor, etc.), a control device, and the like. A person (operator) can board the driving section 21 . A steering device, a transmission device, an operating device, and the like are arranged in the driving section 21 . For example, a pair of front wheels 22 and a pair of rear wheels 23 are provided on each side. The vehicle main body 2 is configured to be able to travel by driving the rear wheels 23 with power generated by a power source. Here, the front wheels 22 function as steering wheels and enable turning in the left-right direction D3. Thereby, the vehicle main body 2 can travel in the field G1 in the front-rear direction D2 and the left-right direction D3 according to the operation of the person riding on the driving part 21. For example, the vehicle main body 2 performs seeding work while meandering within the field G1.

The working device 1 is connected to the rear side of the vehicle body 2 as described above. In this embodiment, the working device 1 is removably connected to the vehicle main body 2, and it is also possible to connect a device other than the working device 1 to the vehicle main body 2.

In the present embodiment, the work vehicle 10 is capable of performing the sowing work of sowing seeds (seed rice) in the field G1 consisting of paddy fields. have. Furthermore, the device main body 3 has a wheel mark erasing device 6 that erases marks from the wheels (front wheels 22 and rear wheels 23) of the vehicle main body 2. That is, the device main body 3 of the working device 1 has a function of erasing wheel marks and a seeding operation. The seeding unit 5 and the wheel mark erasing device 6 are connected to the vehicle body 2, and are arranged in this order from the front side.

As shown in FIG. 1, a three-point link mechanism consisting of a pair of left and right lower links 24 and an upper link 25 is provided at the rear of the vehicle body 2 of the work vehicle 10. The connecting device 4 is configured to be connectable. The upper link 25 is located at the center and above the pair of lower links 24 in the left-right direction D3. The coupling device 4 realizes coupling of the working device 1 to the vehicle body 2 by coupling the device body 3 to a three-point link mechanism (a pair of lower links 24 and an upper link 25). A device other than the working device 1 according to this embodiment can also be connected to the three-point link mechanism (a pair of lower links 24 and upper links 25). With this configuration, it is possible to directly sow seeds (seed rice) in the field G1 consisting of paddy fields using the general-purpose vehicle body 2 without using a dedicated seeding machine. becomes.

In the present embodiment, the work vehicle 10 particularly performs "spot sowing" in which an appropriate amount of seeds are sown at predetermined intervals along the rows set in the field G1 among the direct sowing operations. In other words, while the vehicle main body 2 travels along the rows in the field G1, the seeding (spot sowing) work is performed using the work device 1, so that the seeds are separated by a predetermined interval in the front-rear direction D2 and a distance between the rows in the left-right direction D3. This makes it possible to sow seeds in the same location. Here, the position of the working device 1 in the vertical direction D1 may be adjusted by providing a lifting device having a hydraulic cylinder or the like at the rear of the vehicle body 2 and raising and lowering a three-point link mechanism by the lifting device. good.

[2] Configuration of Working Device Next, the configuration of the (towed) working device 1 according to the present embodiment will be described in detail with reference to FIGS. 2 to 8.

The working device 1 according to the present embodiment includes a device main body 3 and a coupling device 4 that connects the device main body 3 and the vehicle main body 2. The device main body 3 includes the wheel mark erasing device 6 and the seeding unit 5 as described above. Here, the sowing unit 5 is a unit for performing a sowing work, and is therefore an example of a "work unit" that performs some work. Furthermore, since the sowing work is an example of a scattering work that scatters seeds as a material to be spread, the sowing unit 5 is also an example of a "spreading unit" that performs the work of spreading a material to be spread (seeds in this case). In this embodiment, the device main body 3 includes one wheel mark erasing device 6 and a plurality of (for example, five) seeding units 5 (a plurality of work units).

By the way, the plurality of seeding units 5 (the plurality of working units) are arranged side by side in the left-right direction D3, and are connected to the wheel mark erasing device 6 at the support portion 7. Here, a plurality of supporting parts 7 (five as an example) are provided corresponding to the plurality of seeding units 5, and one seeding unit 5 is connected to the coupling device 4 by one supporting part 7. That is, the device main body 3 includes a support portion 7 in addition to a wheel mark erasing device 6 and a seeding unit 5 as a working unit. The support section 7 supports the work unit (seeding unit 5). As will be described in detail later, the support section 7 has a first posture in which the target surface 50 (see FIG. 2) of the work unit (seeding unit 5) is directed above the horizontal direction, and a first posture in which the target surface 50 is directed downwardly below the horizontal direction. The work unit (seeding unit 5) is rotatably supported between the second attitude toward the.

[2.1] Configuration of the coupling device The coupling device 4 is coupled to a three-point link mechanism (a pair of lower links 24 and an upper link 25) provided at the rear of the vehicle body 2 of the work vehicle 10, so that the vehicle A device main body 3 is connected to the rear side of the main body 2. In FIGS. 2 and 3, the pair of lower links 24 and upper links 25 are shown by imaginary lines (two-dot chain lines). In this embodiment, the components of the coupling device 4 are basically made of metal, and the material is selected depending on the required strength, weather resistance, and the like. However, the components of the connecting device 4 are not limited to metal, and may be made of resin, wood, or the like as appropriate.

The coupling device 4 has a support mechanism 41 . The support mechanism 41 supports the device main body 3 in a state in which the device main body 3 is movable in the vertical direction D1 in response to an external force while restricting movement of the device main body 3 in directions other than the vertical direction D1. In this embodiment, the support mechanism 41 supports the wheel mark erasing device 6 (ground leveling body 62) of the device main body 3, so that the wheel mark erasing device can be used together with the plurality of seeding units 5 connected to the wheel mark erasing device 6. 6 to move in the vertical direction D1. In this way, the coupling device 4 supports the device main body 3 (the wheel mark erasing device 6 and the plurality of seeding units 5) in a state where the device main body 3 is movable in the vertical direction D1 according to external force.

The support mechanism 41 includes an arm member 42 and an elevating member 43. Furthermore, the coupling device 4 further includes a biasing section 44 and a guide member 45.

The arm member 42 is rotatably connected to a pair of lower links 24 provided at the rear of the vehicle body 2 at a first fulcrum 421 . The support mechanism 41 moves the device main body 3 in the vertical direction D1 as the arm member 42 rotates about the first fulcrum 421. Specifically, the support mechanism 41 includes a pair of arm members 42 spaced apart in the left-right direction D3 so as to correspond to the left and right pair of lower links 24. Each arm member 42 is an elongated member having a length in one direction, and has a first fulcrum 421 at one end (here, the front end) in the longitudinal direction. Furthermore, each arm member 42 has a second fulcrum 422 at the end (here, the rear end) opposite to the first fulcrum 421 .

The elevating member 43 is a member rotatably connected to the arm member 42 at a second fulcrum 422, and moves in the vertical direction D1 as the arm member 42 rotates. Here, the elevating member 43 is rotatably connected to the upper link 25 provided at the rear of the vehicle body 2 at a fourth fulcrum 434. Thereby, even when the elevating member 43 is raised or lowered, the elevating member 43 moves (in parallel) while maintaining the posture of the elevating member 43 with respect to the horizontal plane. By coupling the device main body 3 to such a lifting member 43, the device main body 3 can also be moved in the vertical direction D1 while maintaining the posture of the device main body 3 with respect to the horizontal plane.

That is, in the present embodiment, the support mechanism 41 allows the device main body 3 fixed to the lifting member 43 to move up and down as the lifting member 43 moves up and down as the arm member 42 rotates about the first fulcrum 421. It goes up and down with 43. Thus, in the present embodiment, the elevating member 43 is rotatably connected to the arm member 42 at the second fulcrum 422 provided at the end of the arm member 42 opposite to the first fulcrum 421 . In the support mechanism 41, the device main body 3 is fixed to an elevating member 43.

More specifically, the elevating member 43 includes (a pair of) base portions 431, (a pair of) spring holding portions 432, an upper coupling portion 433, a first frame F1, a second frame F2, and (a pair of) ) has a third frame F3 and a fourth frame F4. These components of the elevating member 43 are fixed (joined) to each other by, for example, welding, adhesive, fasteners such as bolts and nuts, or a combination thereof. Therefore, these components of the elevating member 43 move up and down in unison.

The pair of base portions 431 are arranged at a constant interval in the left-right direction D3, and are fixed to the wheel mark erasing device 6 (ground leveling body 62) of the device main body 3. The pair of spring holding parts 432 are arranged above the pair of base parts 431 and are fixed to the pair of base parts 431. The first frame F1 is a rectangular cylindrical frame having a length in the left-right direction D3, and connects the pair of spring pressers 432. The second frame F2 is a rectangular cylindrical frame having a length in the vertical direction D1, and is fixed to the first frame F1 so as to protrude upward from the center of the upper surface of the first frame F1.

The upper coupling portion 433 is fixed to the upper end of the second frame F2. The upper coupling portion 433 has a fourth fulcrum 434 and is rotatably connected to the upper link 25 provided at the rear of the vehicle body 2 at the fourth fulcrum 434 . The pair of third frames F3 are cylindrical frames that respectively protrude diagonally downward from the upper coupling portion 433 toward both sides in the left-right direction D3. Here, the third frame F3 includes an inclined portion located toward the rear toward the lower end in side view. The tip portion (lower end portion) of each third frame F3 is fixed to the wheel mark erasing device 6 (ground leveling body 62) of the device main body 3. The fourth frame F4 is a rectangular cylindrical frame having a length in the left-right direction D3, and is formed longer than the entire length of the wheel mark erasing device 6 (ground leveling body 62) in the left-right direction D3. The fourth frame F4 is fixed to the upper surface side of the pair of base parts 431, and is also fixed to the pair of third frames F3.

Here, the support mechanism 41 has a length in the left-right direction D3, and connects to the lower link 24 at the first fulcrum 421 of the arm member 42 and to the upper link 25 at the fourth fulcrum 434 of the upper coupling part 433 of the elevating member 43. They are connected by a shaft member such as a pin. Thereby, the arm member 42 and the upper coupling part 433 are rotatably connected to the lower link 24 and the upper link 25, respectively, about a rotation axis extending in the left-right direction D3.

The biasing portion 44 biases the device main body 3 upward. In this embodiment, the coupling device 4 includes a pair of biasing portions 44 arranged at a constant interval in the left-right direction D3. Each biasing portion 44 is an extensible coil spring, and is arranged in a posture that is extensible and retractable in the vertical direction D1. Here, the pair of biasing parts 44 are respectively arranged between the pair of arm members 42 and the pair of spring holding parts 432. Specifically, each arm member 42 is connected to each spring holding portion 432 at the second fulcrum 422 by a shaft member such as a pin having a length in the left-right direction D3. Thereby, each arm member 42 is rotatably connected to each spring presser portion 432 about a rotation axis extending in the left-right direction D3. The biasing portion 44 is disposed between the upper surface of the first fulcrum 421 on the upper surface of the arm member 42 and the lower surface of the spring holding portion 432.

Thereby, the biasing portion 44 applies a biasing force to the spring retaining portion 432 in the direction of biasing the spring retaining portion 432 upward with respect to the first fulcrum 421 of the arm member 42 . Therefore, when the coil spring serving as the biasing portion 44 is compressed, a biasing force acts between each arm member 42 and each spring holding portion 432 in the direction of widening the gap therebetween. Since the spring presser portion 432 is a part of the elevating member 43, the urging force from the urging portion 44 acts on the elevating member 43 so as to push the entire elevating member 43 upward. That is, in the present embodiment, the coupling device 4 includes a biasing portion 44 that biases the device main body 3 upward by biasing the elevating member 43 upward with respect to the first fulcrum 421 of the arm member 42. have. Thereby, the operation of lifting the elevating member 43 against the weight of the device main body 3 and the like can be assisted by the urging force from the urging section 44.

The guide member 45 is a member that controls the direction of the urging force by the urging section 44 (here, a coil spring). Specifically, the guide member 45 is a rod-shaped member that has a length in one direction and is inserted inside the coil spring serving as the biasing portion 44 . The biasing portion 44 expands and contracts along the longitudinal direction of the guide member 45. The guide member 45 has its base end (lower end) rotatably supported by the arm member 42 at a third fulcrum. In the present embodiment, the third fulcrum is coaxial (common) with the first fulcrum 421, and the guide member 45 has a length in the left-right direction D3 along with the lower link 24 with respect to the arm member 42 at the first fulcrum 421. They are connected by a shaft member such as a pin. Thereby, the guide member 45 is rotatably connected to the arm member 42 about the rotation axis extending in the left-right direction D3.

A distal end (upper end) of the guide member 45 passes through the spring holding portion 432 . Therefore, when the arm member 42 rotates relative to the spring holding part 432, the guide member 45 rotates around the third fulcrum (first fulcrum 421), and the inclination angle of the guide member 45 with respect to the arm member 42 changes. do. That is, in this embodiment, the coupling device 4 is rotatably coupled to the arm member 42 at the third fulcrum, and rotates about the third fulcrum as the arm member 42 rotates about the first fulcrum 421. It has a guide member 45. The biasing section 44 generates a biasing force along the guide member 45. Thereby, buckling of the coil spring serving as the biasing portion 44 can be prevented, and the biasing force of the biasing portion 44 can be efficiently applied to the elevating member 43.

[2.2] Configuration of the wheel mark erasing device The wheel mark erasing device 6 includes a plurality of earth movers 61 and a ground leveling body 62. When the device main body 3 is towed by the vehicle main body 2 when the vehicle main body 2 is traveling (forward), the plurality of soil gathering bodies 61 move the soil on the surface layer of the field G1 to the wheels of the vehicle main body 2 in the left-right direction D3. (mainly the rear wheel 23) is configured to be closer to the passing position side. The ground leveling body 62 is configured to level the soil collected by the plurality of earth grading bodies 61 when the device body 3 is pulled by the vehicle body 2 when the vehicle body 2 is traveling (moving forward).

That is, the wheel mark erasing device 6 collects soil on the side where the wheels pass by using a plurality of soil collecting bodies 61 and leveling the collected soil with a ground leveling body 62, thereby removing the surface layer of the field G1 when the vehicle main body 2 is traveling. Remove wheel marks on the parts. Here, the "soil" that is collected by the earth grading body 61 or leveled by the earth leveling body 62 includes mud, sand, clay, and the like. Further, the wheel mark erasing device 6 includes not only a structure that completely erases wheel marks, but also a structure that makes wheel marks less noticeable by covering the wheel marks (that is, grooves) with soil.

In this embodiment, the ground leveling body 62 is made of a single metal plate, but the earth leveling body 62 is not limited to this example, and may be configured by combining a plurality of members. For example, the ground leveling body 62 may be configured by combining members divided into a plurality of parts in the front-rear direction D2 or the left-right direction D3.

The ground leveling body 62 is a metal plate-shaped body having a length in both the front-rear direction D2 and the left-right direction D3 and having a rectangular shape in plan view. The ground leveling body 62 is joined to the support mechanism 41 of the coupling device 4 on its upper surface side. Specifically, a pair of base portions 431 and a pair of third frames F3 in the support mechanism 41 are joined to the upper surface of the ground leveling body 62. The connection between the ground leveling body 62 and the support mechanism 41 is realized, for example, by welding, adhesive, fasteners such as bolts and nuts, or a combination thereof.

The ground leveling body 62 has a total length (width) that is longer than the total width of the work vehicle 10 in the left-right direction D3. The ground leveling body 62 includes an inclined part 621 that extends rearward while being inclined with respect to the horizontal plane so as to be located lower toward the rear end, and a horizontal part 622 that extends rearward along the horizontal plane from the rear end of the inclined part 621. Contains. The ground leveling body 62 includes the sloped portion 621, so that the front end portion of the land leveling body 62 is located at a higher position. Soil can be guided backwards along the slope. The horizontal portion 622 can press the soil guided backward at the inclined portion 621 from above to level the soil.

As shown in FIGS. 3, 5, and 6, a plurality of (here, 12) earth bundling bodies 61 are arranged on the lower surface side (back side) of the earth leveling body 62, and each extends from the front side to the rear side. It is a plate-shaped body made of metal. Here, the plurality of shoring bodies 61 include a plurality of shoring bodies 61 for right wheels corresponding to the right rear wheel 23 of the vehicle main body 2, and a plurality of shoring bodies 61 for left wheels corresponding to the left rear wheel 23. A plurality of (six in this case) earth bundling bodies 61 are included. Since the plurality of mulch bodies 61 for the right wheels and the plurality of mulch bodies 61 for the left wheels have similar configurations, the following description will focus on the plurality of mulch bodies 61 for the left wheels unless otherwise specified. The explanation will be omitted regarding the plurality of earth shoring bodies 61 for the right wheel.

In this embodiment, the plurality of (six in this case) mulch bodies 61 for the left wheel include three sets of mulch bodies 61, with a pair (two) of left and right mulch bodies 61 as one set of mulch bodies 61. ing. That is, in the present embodiment, the plurality of mulch bodies 61 include a pair of mulch bodies 61a of a first group, a pair of mulch bodies 61b of a second group, and a pair of mulch bodies 61c of a third group. There is. Here, the center position of the portion through which the (left side) rear wheel 23 passes in the left-right direction D3 is defined as a reference position K1 (see FIG. 5). In this case, the left and right pairs of earth bulging bodies 61 in each of the first to third sets are arranged in positions and postures (orientations) that are symmetrical in the left-right direction D3 with the reference position K1 as the center. These three sets (six in total) of the earth bulging bodies 61 are arranged in the following order from the side closest to the reference position K1: the first set of mulch bodies 61a, the second set of mulch bodies 61b, and the third set of mulch bodies 61c. They are arranged side by side.

Moreover, these three sets (six in total) of the earthen bodies 61 are arranged so as to be lined up at a constant interval in the left-right direction D3. The left and right pairs of earth shoring bodies 61 in each of the first to third sets are inclined with respect to the traveling direction of the vehicle body 2 (front-rear direction D2) so that they approach each other toward the rear. In other words, in each of the first to third sets, the distance between the left and right pairs of earthen bodies 61 in the left-right direction D3 becomes narrower toward the rear. The rear ends of either the left or right shoring body 61 in each of the first to third sets do not come into contact with each other, and the distance between the rear ends is maintained at a predetermined distance (as an example, the width of the rear wheel 23) or more. has been done.

As shown in FIG. 6, each of the plurality of earth-filling bodies 61 is arranged across the inclined portion 621 and the horizontal portion 622 of the earth leveling body 62 in the front-rear direction D2. Each earthwork body 61 has, at its bottom (lower end), a front side part 611 that extends rearward at an angle with respect to the horizontal plane so as to be located lower toward the rear, and a rear side part 611 that extends rearward along the horizontal plane. 612. The rear part 612 is formed to have a longer length in the front-rear direction D2 than the front part 611. Here, the rear end portion of the front side portion 611 is at the same position or substantially the same position as the rear end portion of the inclined portion 621 of the ground leveling body 62 in the front-rear direction D2. Therefore, the front side portion 611 of each earth-filling body 61 and the inclined portion 621 of the earth-leveling body 62 overlap in the vertical direction D1, and the rear side portion 612 of each earth-filling body 61 and the horizontal portion 622 of the earth-leveling body 62 are vertically overlapped. overlap in direction D1.

The front end portions of the three sets (six in total) of the earth bundling bodies 61 are located at the same position in the front-rear direction D2. On the other hand, the three sets (six in total) of the earth bundling bodies 61 are configured to have different lengths in the front-rear direction D2. The pair of left and right earth shoring bodies 61 in each of the first to third sets has a length in the front-rear direction D2 that extends at least to a portion through which the rear wheel 23 passes. Therefore, the length in the front-rear direction D2 of the three sets (six in total) of the earth bulging bodies 61 is the shortest in the first set of mulch bodies 61a, which is closer to the reference position K1, the second set of mulch bodies 61b, and the third set. The length increases in the order of the earth filler body 61c.

The plurality of earth bulging bodies 61 and the earth leveling bodies 62 are connected to each other by, for example, welding, adhesion, fasteners such as bolts and nuts, or a combination thereof. Furthermore, each of the plurality of earthen bodies 61 may be configured to be rotatable (swingable) in plan view using its front end as a fulcrum. Thereby, the inclination angle of each shoring body 61 with respect to the traveling direction (front-rear direction D2) of the vehicle body 2 becomes variable. In this case, the first set of mulch bodies 61a, the second set of mulch bodies 61b, and the third set of mulch bodies 61c are interlocked so that the distance between the three sets of mulch bodies 61 in the left-right direction D3 is maintained constant. It is preferable to rotate it.

[2.3] Configuration of Support Parts and Seeding Units The seeding units 5 as a plurality of (here, five) work units are supported by the plurality of (here, five) support parts 7 as described above. In this embodiment, the seeding units 5 are each connected to the lifting member 43 of the connecting device 4 at the support portion 7 . More specifically, the plurality of support parts 7 support the plurality of seeding units 5 so as to connect the plurality of seeding units 5 (action units) to the fourth frame F4 of the elevating member 43. The plurality of seeding units 5 are arranged so as to be spaced apart from each other in the left-right direction D3.

Each support part 7 has a mounting part 71 and a support bar 72. The attachment portion 71 is fixed to the fourth frame F4 and has a swing fulcrum 711. The attachment portion 71 and the fourth frame F4 are connected to each other by, for example, welding, adhesion, fasteners such as bolts and nuts, or a combination thereof. The support bar 72 is a cylindrical member having a length in the front-rear direction D2, and its middle portion is connected to the attachment portion 71, and its rear end portion is connected to the seeding unit 5. That is, the seeding unit 5 is connected to the connection device 4 (fourth frame F4) via the support bar 72 as the support part 7 and the attachment part 71.

Here, the support bar 72 is rotatably supported at a swing fulcrum 711 with respect to the mounting portion 71 . Specifically, the intermediate portion of the support bar 72 is connected to the mounting portion 71 at the swing fulcrum 711 by a shaft member such as a pin having a length in the left-right direction D3. Thereby, the support bar 72 is rotatably connected to the fourth frame F4 about a rotation axis extending in the left-right direction D3. Then, as the support bar 72 rotates (swings) around the swing fulcrum 711 so that its rear end moves up and down, the seeding unit 5 connected to the rear end of the support bar 72 moves in the vertical direction D1. Move to. Furthermore, the front end of the support bar 72 contacts the mounting portion 71 from below, thereby limiting the downward rotation range of the rear end of the support bar 72, and as a result, the vertical direction of the seeding unit 5 is restricted. Set the bottom dead center in the movement range of D1.

Particularly in this embodiment, the support bars 72 of the plurality of support sections 7 each connected to the seeding unit 5 are individually rotatable (swingable). As each supporter 7 rotates, each seeding unit 5 individually moves in the vertical direction D1. That is, the device main body 3 has a plurality of work units (seeding units 5) and a plurality of support parts 7. The plurality of support parts 7 support the plurality of work units (seeding unit 5) in a state that they can individually move in the vertical direction D1. In other words, the plurality of work units (seeding unit 5) are supported so as to be individually movable in the vertical direction D1.

In this way, a plurality of (here, five) sowing units 5 as working units are arranged behind the wheel mark erasing device 6. That is, the device main body 3 includes the seeding unit 5 arranged on the opposite side (rear side) of the vehicle main body 2 with respect to the ground leveling body 62 in plan view. Since the plurality of seeding units 5 have the same configuration, the following description will focus on one seeding unit 5 unless otherwise specified, and the description of the other seeding units 5 will be omitted.

As shown in FIGS. 7 and 8, the seeding unit 5 includes a float 51, a drive wheel 52, a hopper 53, a feeding section 54, a cover 55, a plurality of holes 56, and a rotational force transmission mechanism 57. It is equipped with.

The float 51 supports the seeding unit 5 so that the seeding unit 5 does not sink. The float 51 has a length in the front-rear direction D2, and is arranged at the lower end of the seeding unit 5. The float 51 has a front side part 511 and a rear side part 512, and is arranged so that the front side part 511 and the rear side part 512 are lined up in this order from the front side in the front-rear direction D2 in plan view. The front side part 511 is formed in a semicircular shape (see FIG. 5) in plan view, and the rear side part 512 is formed in a rectangular shape narrower than the front side part 511 in the left-right direction D3. A rear portion 512 of the float 51 is rotatably connected to the support bar 72 about a rotation axis extending in the left-right direction D3. Thereby, the float 51 is connected to the rear end of the support bar 72.

The front side portion 511 of the float 51 is formed in such a shape that its front end portion is curved upward when viewed from the side. Furthermore, an elastic body (not shown) is provided between the first hook portion 513 of the front side portion 511 of the float 51 and the second hook portion 712 of the attachment portion 71 for urging the float 51 upward. provided. As a result, the float 51 is urged upward, thereby preventing the occurrence of inconveniences such as the front side portion 511 of the float 51 being buried in the field G1.

A first groove creator 514 is provided on the lower surface side (back side) of the float 51 to form a groove in the field G1. A pair of first groove makers 514 are provided for one float 51, and these pair of first groove makers 514 are arranged on both sides of the rear side portion 512 in the left-right direction D3. Each first groover 514 is formed by bending a metal plate into a downwardly convex mountain-fold shape, and extends from the lower surface of the float 51 toward the center in the left-right direction D3 and toward the rear in the front-back direction D2. It is formed so that the amount of protrusion becomes large. Each first groove creator 514 forms a seeding groove G11 (see FIG. 9) along the traveling direction (front-rear direction D2) of the vehicle body 2 when the vehicle body 2 travels. In this embodiment, since a pair of first groove makers 514 are provided in one seeding unit 5, two seeding grooves G11 are formed at intervals in the left-right direction D3.

Further, on the lower surface side (rear surface side) of the float 51, a second groove creator 515 is provided to form a groove in the field G1. The second groove cutter 515 is arranged at the center of the float 51 in the left-right direction D3. The second groove cutter 515 is formed by bending a metal plate into a downwardly convex mountain-fold shape, and the second groove cutter 515 is formed by bending a metal plate into a downwardly convex mountain-fold shape. It is formed to have a large protrusion amount. The second groove creator 515 forms a drainage groove G12 (see FIG. 9) along the traveling direction (front-rear direction D2) of the vehicle body 2 when the vehicle body 2 travels.

Here, as shown in FIGS. 7 and 8, the second groove creator 515 is located behind the pair of first groove creators 514 in the front-rear direction D2, and is located behind the pair of first groove creators 514 in the left-right direction D3. It is arranged at a position between the groove makers 514. That is, the seeding unit 5 includes a first groove creator 514 that forms a seeding groove G11 along the traveling direction of the vehicle body 2, and a drainage groove G12 that forms a seeding groove G12 along the traveling direction of the vehicle body 2 on the side of the seeding groove G11. a second groove cutter 515 for forming the groove. Here, the height H2 of the second groove cutter 515 from the bottom surface of the float 51 (see FIG. 7) is higher than the height H1 of the first groove cutter 514 from the bottom surface of the float 51 (see FIG. 7). big (high). That is, the amount of protrusion of the second groove cutter 515 from the lower surface of the float 51 is set to be larger than that of the first groove cutter 514. Therefore, the drainage groove G12 is formed deeper than the seeding groove G11.

The hopper 53 is an example of a container that accommodates the material to be sprayed. In this embodiment, the working device 1 performs a dispersing operation (that is, a sowing operation) using seeds as a material to be dispersed, so the hopper 53 is an example of a container that accommodates ((stores)) seeds. One surface of the hopper 53, which is a container, constitutes the target surface 50 of the seeding unit 5 (work unit).In other words, the target surface 50 is a container (here, the hopper) that accommodates the material to be spread (seeds here). 53).Specifically, the upper surface of the hopper 53 when the sowing unit 5 is in the first posture is the target surface 50.Hereinafter, unless otherwise specified, the sowing unit 5 The following explanation assumes that the object is in the first attitude.

The hopper 53 has a rectangular shape in plan view, and is arranged at the upper end of the seeding unit 5. The hopper 53 includes a hopper body 531 and a lid 532. The hopper main body 531 is a box with an open top surface. The lid body 532 is configured to be openable and closable with respect to the hopper body 531, and covers the opening surface (top surface) of the hopper body 531 in the closed state, and opens the opening surface (top surface) of the hopper body 531 in the open state. do. Therefore, when the lid body 532 is in the open state, it is possible to replenish seeds as a scattering material into the hopper body 531 from the upper surface of the hopper body 531.

The feeding unit 54 sequentially feeds out the seeds stored in the hopper 53 and sows them directly onto the field G1. The feeding section 54 is arranged below the hopper 53 and is integrated with the hopper 53. In this embodiment, as shown in FIG. 8, the feeding section 54 includes a left feeding section 541 and a right feeding section 542, and is configured in a bifurcated shape branching in the left-right direction D3. The left feeding portion 541 and the right feeding portion 542 are fixed to the cover 55 so as to penetrate through the upper surface of the cover 55.

The internal space of the hopper 53 and the internal space of the feeding section 54 (the left feeding section 541 and the right feeding section 542) are in communication (continuous), and the seeds stored in the hopper 53 are supplied to the feeding section 54 by their own weight etc. It is possible. Here, the feeding section 54 further includes a feeding roll 543 and a discharge section 544. The feed roll 543 and the discharge section 544 are arranged inside the cover 55. In this embodiment, one pair of feeding rolls 543 and one pair of discharge parts 544 are provided in one seeding unit 5 so as to correspond to the left feeding part 541 and the right feeding part 542. That is, the pair of feeding rolls 543 are arranged at intervals in the left-right direction D3, and are located below the left feeding section 541 and the right feeding section 542, respectively. The pair of discharge parts 544 are arranged at intervals in the left-right direction D3, and are located below the left-hand delivery part 541 and the right-hand delivery part 542, respectively.

Each feeding roll 543 discharges seeds supplied from the hopper 53 through the left feeding section 541 or the right feeding section 542 from the discharging section 544 at a predetermined timing. Each feed roll 543 is formed in a cylindrical shape having an axis along the left-right direction D3, and has a plurality of recesses at regular intervals in the circumferential direction on its circumferential surface. As a result, each feed roll 543 takes in seeds into the recesses located on the upper side, and discharges the seeds from the recesses located on the lower side to the discharge section 544. Furthermore, a driven shaft 545 extending in the left-right direction D3 is rotatably held by the cover 55, and the pair of delivery rolls 543 are held by the cover 55 in a rotatable state together with the driven shaft 545. Therefore, as each delivery roll 543 rotates around the driven shaft 545, the seeds in the hopper 53 are discharged from the discharge section 544 in appropriate amounts. The discharge section 544 is open downward, and the seeds discharged from the discharge section 544 are directly sown into the field G1.

The working device 1 does not include a rotation drive unit (power source) for rotationally driving the drive wheels 52, and the drive wheels 52 rotate as if rolling on the field G1 as the vehicle body 2 travels. . That is, in this embodiment, the work unit (seeding unit 5) includes the drive wheels 52 that roll as the vehicle body 2 travels. In this embodiment, the drive wheel 52 has a circular outer frame portion 521 and an annular inner frame portion 522. The outer frame portion 521 and the inner frame portion 522 are spaced apart from each other in the left-right direction D3 and are connected to each other. The drive wheel 52 further includes a drive shaft 523 extending in the left-right direction D3, and is configured to be rotatable around the drive shaft 523. Like the driven shaft 545, the drive shaft 523 is rotatably held with respect to the cover 55.

In this embodiment, a pair of driving wheels 52 are also provided in one seeding unit 5 so as to correspond to the left side feeding section 541 and the right side feeding section 542. The pair of drive wheels 52 are arranged at intervals in the left-right direction D3, and are arranged at positions corresponding to the lower end portions of the left feeding section 541 and the right feeding section 542, respectively. The pair of discharge portions 544 are arranged so as to fit within the width of the drive wheel 52 in the left-right direction D3. The drive wheel 52 corresponding to the left side feeding portion 541 is referred to as a first driving wheel 52A (see FIG. 8), and the driving wheel 52 corresponding to the right side feeding portion 542 is referred to as a second driving wheel 52B (see FIG. 8).

Here, a plurality of openings 56 are provided on the outer periphery of each drive wheel 52 at predetermined intervals in the circumferential direction. The plurality of apertures 56 are members that extend radially from the drive shaft 523 when viewed from the side. Each hole 56 protrudes outward from the outer periphery of the drive wheel 52 (to the side opposite to the drive shaft 523), and as the drive wheel 52 rotates, the hole 56 spreads the soil in the field G1 to the rear side. It is configured so that a seeding hole G13 (see FIG. 9) is formed in the field G1 by scooping it up. Here, as shown in FIG. 8, the hole section 56 is arranged at the same position as the first groove creator 514 in the left-right direction D3, and forms a seeding hole G13 in the seeding groove G11. That is, the seeding unit 5 includes a drive wheel 52 that rolls as the vehicle main body 2 runs, and is provided on the outer periphery of the drive wheel 52, and scoops soil in the seeding groove G11 to form a seeding hole G13 in the seeding groove G11. a plurality of apertures 56 forming a plurality of holes.

Here, in this embodiment, the first drive wheel 52A and the second drive wheel 52B are integrally connected by the same (single) drive shaft 523. Therefore, the first drive wheel 52A and the second drive wheel 52B rotate in synchronization with each other while maintaining the rotation angle difference around the drive shaft 523. A plurality of apertures 56 are provided in each of the first drive wheel 52A and the second drive wheel 52B. 52B and has a phase difference in the circumferential direction.

Specifically, in this embodiment, four openings 56 are provided in each of the first drive wheel 52A and the second drive wheel 52B. The four openings 56 in each drive wheel 52 are arranged at 90 degree intervals with the drive wheel 52 at the center. On the other hand, the hole 56 provided in the first drive wheel 52A and the hole 56 provided in the second drive wheel 52B are spaced apart from each other by 45 degrees with the drive wheel 52 at the center. In this way, the first drive wheel 52A and the second drive wheel 52B are set to have different positions (phases) at which the apertures 56 are arranged in the rotational direction.

Further, an opening 561 is formed in the hole portion 56 to allow a portion of the scooped soil to fall. In this embodiment, as an example, the opening 561 is formed in a cutout shape that is open toward the distal end side of the aperture 56 (the side opposite to the drive shaft 523). By providing such an opening 561, it is possible to appropriately adjust the amount of soil scooped out by the hole portion 56.

Further, the working device 1 does not include a rotational drive unit (power source) for rotationally driving the feeding roll 543, and rotates the feeding roll 543 by transmitting the rotational force of the drive wheel 52 to the feeding roll 543. It is configured to allow Therefore, the seeding unit 5 has a rotational force transmission mechanism 57 that transmits the rotational force of the drive wheel 52 to the delivery roll 543, as shown in FIG. Specifically, the rotational force transmission mechanism 57 includes a gear that rotates together with the drive shaft 523 and a gear that rotates together with the driven shaft 545. As a result, when the drive wheel 52 rotates, the rotational force transmission mechanism 57 transmits the rotational force of the drive shaft 523 to the driven shaft 545, causing the pair of delivery rolls 543 to rotate.

Here, the timing at which each feed roll 543 discharges seeds from the discharge section 544 is determined according to its rotational speed (rotation speed). In this embodiment, the pair of feed rolls 543 are connected by the same (single) driven shaft 545, so they rotate as one.

The cover 55 has a length in the left-right direction D3 when viewed from above, and is formed in the shape of a hollow rectangular parallelepiped with an open bottom surface. Here, the cover 55 holds the feeding section 54 (the left feeding section 541, the right feeding section 542, and the discharge section 544) and the hopper 53, as described above. Further, the cover 55 rotatably holds the drive shaft 523 of the drive wheel 52 and the driven shaft 545 of the feeding section 54. In short, in this embodiment, all the components of the seeding unit 5 except the float 51 are held by the cover 55.

Here, the cover 55 is rotatably supported with respect to the support bar 72 of the support portion 7 at an opening/closing fulcrum 551 (see FIG. 7). Specifically, the cover 55 has an opening/closing fulcrum 551 at its rear end and a locking portion 552 (see FIG. 7) at its front end. On the lower surface side of the support bar 72, as shown in FIG. is located. The rear stay 721 and the front stay 722 are each formed into a downwardly open rectangular shape when viewed from the rear, and are fixed to the support bar 72 (see FIG. 8). The cover 55 is connected to the rear stay 721 with a shaft member such as a pin having a length in the left-right direction D3 at the opening/closing fulcrum 551, and a shaft member such as a pin having a length in the left-right direction D3 at the lock portion 552. and is connected to the front stay 722. Therefore, when the opening/closing fulcrum 551 and the lock part 552 are connected to the rear stay 721 and the front stay 722, respectively, the cover 55 holds the support bar 72 between the rear stay 721 and the front stay 722. 72. On the other hand, when the lock portion 552 is disconnected from the front stay 722, the cover 55 is rotatably connected to the support bar 72 about a rotation axis extending in the left-right direction D3 through the opening/closing fulcrum 551. will be done. In FIG. 8, a shaft member 553 that connects the cover 55 to the support bar 72 (rear stay 721) at the opening/closing fulcrum 551 is shown by an imaginary line (two-dot chain line).

In this way, in the "unlocked state" in which the lock part 552 is free, the support part 7 (support bar 72) It will be supported by As the cover 55 rotates, the components of the seeding unit 5 held by the cover 55 (excluding the float 51) also rotate about the opening/closing fulcrum 551. In short, the support part 7 has a first attitude in which the target surface 50 of the sowing unit 5 (here, the upper surface of the hopper 53) is directed above the horizontal, and a second posture in which the target surface 50 is directed below the horizontal. (see FIGS. 12 and 13), the seeding unit 5 is rotatably supported. On the other hand, in the "locked state" in which the lock part 552 is fixed to the support bar 72 (front stay 722), the rotation of the cover 55 is regulated, and the sowing unit 5 is placed in the first position with the target surface 50 facing upward from the horizontal. Maintained in position. When performing sowing work with the sowing unit 5, the sowing unit 5 maintains the first posture by setting it in the "locked state".

[3] Operation of working device Next, the operation of the working device 1 according to the present embodiment will be described with reference to FIGS. 9 to 13. Below, the operation of the working device 1 when performing work (seeding work here) will be described first, and then the "hopper open operation" in which the sowing unit 5 is placed in the second posture will be described.

[3.1] Operation during work A device body 3 is connected to the rear side of the vehicle body 2 of the work vehicle 10 by a coupling device 4, and when the vehicle body 2 is traveling, the device body 3 of the work device 1 is connected to the rear side of the vehicle body 2 of the work vehicle 10. It is towed by the vehicle body 2. At this time, the main body 3 of the apparatus is towed in such a manner that at least the float 51 and drive wheel 52 of each seeding unit 5, and the wheel mark erasing device 6 are brought into contact with the field G1 (see FIG. 1). A pair of first groove cutter 514 and second groove cutter 515 are arranged on the lower surface side of the float 51 . Therefore, as the vehicle main body 2 moves forward, as shown in FIG. A seeding groove G11 is formed, and a drainage groove G12 is formed along the traveling direction of the vehicle body 2 (vertical direction in FIG. 9) by the second groove creator 515. Furthermore, since a plurality of openings 56 are provided on the outer periphery of the drive wheel 52, as the vehicle body 2 moves forward, a plurality of openings 56 are provided in the field G1 in the direction of movement of the vehicle body 2. A plurality of seeding holes G13 are formed along the line.

Here, in this embodiment, the first groove cutter 514, the hole portion 56 of the drive wheel 52, and the discharge portion 544 of the feeding portion 54 are arranged at the same or substantially the same position in the left-right direction D3. As a result, when the vehicle main body 2 travels forward, the seeding groove G11 formed by the first groove creator 514 and the seeding hole G13 formed by the hole portion 56 are the same or approximately the same in the left-right direction D3. formed at the same location. The seeds discharged from the discharge section 544 are also discharged (directly sown) at the same or substantially the same position as the seeding groove G11 and the hole section 56 in the left-right direction D3.

More specifically, the positions that act on the field G1 are arranged in this order from the front side: the first trencher 514, the hole portion 56 of the drive wheel 52, and the discharge portion 544 of the feeding portion 54. Therefore, a seeding groove G11 is formed in the field G1 by the first furrower 514, a seeding hole G13 is formed in the perforated part 56 in the seeding groove G11, and the seeds are removed from the discharge part 544 by the feeding roll 543. It will be directly sown. Furthermore, the open hole part 56 scoops up the soil in the field G1 to the rear side to form a seeding hole G13 in the field G1, and deposits the scooped soil behind the seeding hole G13 to form a bank part G14. Form. Thereby, seeding holes G13 and bank portions G14 are alternately formed in the seeding groove G11 along the longitudinal direction of the seeding groove G11.

Then, the seeds are discharged from the discharge section 544 into the sowing groove G11 at a predetermined timing by the feeding roll 543, thereby making it possible to directly sow the seeds into the sowing hole G13 or the bank G14 in the sowing groove G11. . Here, the position at which seeds are sown directly in the longitudinal direction of the seeding groove G11 can be adjusted as appropriate by adjusting the rotation timing of the feed roll 543, etc. In this way, by sowing seeds directly into the seeding furrow G11 in which the bank G14 is formed intermittently, even if the seeds are about to be washed away by the water on the surface of the field G1 (paddy field), the seeds will not be able to reach the bank. By riding on G14, it becomes easier to keep the seeds at a predetermined direct sowing position in the seeding groove G11.

Here, in the present embodiment, the work unit (seeding unit 5) uses a pair of feed rolls 543 that rotate with the rolling of the drive wheel 52, and discharges waste at a timing synchronized with the rotation of the pair of feed rolls 543. (a pair of discharge parts 544 which discharge seeds). A pair of feed rolls 543 rotate in synchronization with each other. As a result, the seeds as waste are discharged from the pair of discharge parts 544 at mutually synchronized timing. Thereby, the seeds are discharged from the pair of discharge portions 544 in a well-balanced manner, making it easier to appropriately adjust the amount and interval of directly sown seeds.

Further, the second groove cutter 515 is arranged between the pair of first groove cutters 514 in the left-right direction D3. In particular, in this embodiment, both ends of the second groove creator 515 in the left-right direction D3 are arranged so as to overlap with the pair of first groove creators 514 in the front-rear direction D2. Therefore, as shown in FIG. 9, a drainage groove G12 is formed without any gap between the pair of seeding grooves G11. Thereby, the drain G12 can drain the water in the pair of seeding grooves G11 along the longitudinal direction of the drain G12. As a result, it becomes easier to prevent seeds from being washed away by water on the surface of field G1 (paddy field).

In this embodiment, the work unit (seeding unit 5) includes a first drive wheel 52A and a second drive wheel 52B that are connected by the same drive shaft 523 as the drive wheels 52. A plurality of openings 56 are provided at different positions in the circumferential direction on the outer periphery of each of the first drive wheel 52A and the second drive wheel 52B. Therefore, while keeping the number of holes 56 provided in each drive wheel 52 small, the holes 56 can be arranged in small increments in the circumferential direction on both the first drive wheel 52A and the second drive wheel 52B. become. Therefore, it is possible to reliably drive the drive wheel 52 while reducing the probability that seeds discharged from the discharge section 544 will adhere to the perforated section 56.

Further, since the opening 561 is formed in the opening 56 to allow a portion of the scooped soil to fall, it is possible to appropriately adjust the amount of soil scooped out by the opening 56. That is, if the amount of soil scooped out by the opening 56 is too large, the soil scooped out by the opening 56 may cause the bank portion G14 formed at the rear of the seeding hole G13 to become too high. 561, the amount of soil scooped up by the hole 56 can be reduced and the height of the bank portion G14 can be adjusted appropriately. Furthermore, the presence of the opening 561 can reduce the probability that the seeds discharged from the discharge section 544 will adhere to the aperture section 56.

Next, the operation of the wheel mark erasing device 6 disposed in front of the seeding unit 5 will be explained. When the vehicle main body 2 travels forward, the wheel mark erasing device 6 towed by the vehicle main body 2 is positioned at the reference position K1 side, which is the center of the portion through which the rear wheels 23 pass, in each of the plurality of earth shoring bodies 61. put soil on. At this time, although the first set of earth gathering bodies 61a closest to the reference position K1 in the left-right direction D3 crush the soil to a rough degree, it is possible to bring the crushed soil closer to the reference position K1. The second set of soil gathering bodies 61b, which is the second closest to the reference position K1 in the left-right direction D3, can gather soil toward the reference position K1 while crushing the soil finely. Further, in the third set of soil gathering bodies 61c that is farthest from the reference position K1 in the left-right direction D3, the soil can be brought closer to the reference position K1 while crushing the soil to a finer degree. In this way, the soil can be brought closer to the reference position K1 while the plurality of sets of soil gathering bodies 61a to 61c gradually crush the soil to a finer degree.

In addition, in the present embodiment, among the plurality of sets of mulch bodies 61a to 61c, the mulch body 61 located closer to the reference position K1, which is the center of the portion through which the rear wheel 23 passes, has a longer length in the front-rear direction D2. Becomes shorter. Thereby, each of the plurality of soil gathering bodies 61 can appropriately gather the crushed soil toward the reference position K1 side. Therefore, for example, even if the soil in the field G1 is hard, the soil can be sufficiently crushed by the plurality of mulching bodies 61 and then mulched toward the reference position K1. Moreover, since the soil is gathered by the plurality of earth gathering bodies 61, a sufficient amount of soil can be secured.

Furthermore, since the wheel mark erasing device 6 includes not only the plurality of earth grading bodies 61 but also the ground leveling body 62, the soil moved toward the reference position K1 by the plurality of earth grading bodies 61 is leveled by the ground leveling body 62. It is possible to properly erase (or make wheel marks less noticeable). Moreover, since the earth leveling body 62 has an inclined portion 621 on the front side thereof, it suppresses the movement of soil upwardly from the earth leveling body 62 and moves a sufficient amount of soil to the lower side of the earth leveling body 62. be able to. As a result, the soil leveling body 62 can appropriately level the soil moved to the lower side of the leveling body 62 at the inclined portion 621 at the horizontal portion 622, and appropriately erase (or make wheel marks less noticeable). be able to.

As explained above, in the working device 1 according to the present embodiment, the main body 3 of the device includes a plurality of mounding bodies 61 and a ground leveling body 62 as the wheel mark erasing device 6. The plurality of soil gathering bodies 61 gather soil at positions where the wheels (mainly the rear wheels 23) of the vehicle body 2 pass. The ground leveling body 62 levels the soil collected by the plurality of soil gathering bodies 61. As a result, before the sowing unit 5 performs the sowing work, the working device 1 erases (or By making it inconspicuous), it is possible to prepare the field G1 in a state suitable for seeding work.

By the way, in the working device 1 according to the present embodiment, the connecting device 4 that connects the device main body 3 to the vehicle main body 2 has the support mechanism 41, as described above. The support mechanism 41 supports the device main body 3 in a state in which the device main body 3 is movable in the vertical direction D1 in response to an external force while restricting movement of the device main body 3 in directions other than the vertical direction D1. That is, as shown in FIGS. 10 and 11, the entire device main body 3 including the wheel mark erasing device 6 (the plurality of earth grading bodies 61 and the ground leveling bodies 62) can be moved in the vertical direction D1 according to external force. .

For example, when the device main body 3 passes through a dent or muddy area that has occurred in a part of the field G1, the gravity acting on the device main body 3 (self-weight of the device main body 3) causes the device to The device main body 3 moves downward in the vertical direction D1 within the movable range of the main body 3 from the top dead center to the bottom dead center. That is, as the arm member 42 rotates around the first fulcrum 421 (clockwise in FIG. 10), the entire device body 3 sinks downward relative to the first fulcrum 421. Displace (descend). At "bottom dead center" in the lower part of FIG. 10, the working device 1 before the device main body 3 is lowered is shown by an imaginary line (two-dot chain line).

When the device main body 3 descends, the coil spring serving as the biasing portion 44 is compressed. As a result, the impact of the device body 3 descending is absorbed by the biasing portion 44, and the impact applied to the device body 3 and the connecting device 4 can be alleviated, and excessive sinking of the device body 3 can be prevented. . Further, when the coil spring serving as the biasing portion 44 is compressed, the guide member 45 rotates relatively (clockwise in FIG. 10) about the third fulcrum (first fulcrum 421). Thereby, buckling of the coil spring serving as the biasing portion 44 can be prevented, and the biasing force of the biasing portion 44 can be efficiently applied to the elevating member 43.

On the other hand, for example, when the device main body 3 escapes from a dent or muddy area that occurs in a part of the field G1, the reaction force (vertical force, buoyancy, etc.) acting on the device main body 3 from the field G1 causes the As shown in FIG. 2, the device main body 3 moves upward in the vertical direction D1 within the movable range of the device main body 3 from the bottom dead center to the top dead center. That is, by rotating the arm member 42 around the first fulcrum 421 (counterclockwise in FIG. 11), the entire device body 3 is lifted upward relative to the first fulcrum 421. Displace (rise). At "Top Dead Center" in the lower part of FIG. 11, the working device 1 before the device main body 3 is raised is shown by an imaginary line (two-dot chain line).

When the main body 3 of the device rises, the coil spring serving as the biasing portion 44 expands. Thereby, the force for lifting the device main body 3 can be assisted by the urging portion 44, the device main body 3 can be lifted smoothly, and excessive sinking of the device main body 3 can be prevented. Here, it is preferable that the urging force from the urging section 44 is adjusted so that the device main body 3 is in an appropriate ground contact state with respect to the field G1. Further, when the coil spring serving as the biasing portion 44 is expanded, the guide member 45 rotates relatively (counterclockwise in FIG. 11) about the third fulcrum (first fulcrum 421). Thereby, buckling of the coil spring serving as the biasing portion 44 can be prevented, and the biasing force of the biasing portion 44 can be efficiently applied to the elevating member 43.

As a result, even if there are irregularities in the field G1, for example, the device main body 3 can be moved appropriately in the vertical direction D1 to follow the field G1 during work, so that the device main body 3 can be moved relative to the field G1. It becomes possible to maintain the grounding condition appropriately. Therefore, in the working device 1 according to the present embodiment, the device main body 3 is less likely to sink or float with respect to the field G1 during the execution of the work, and the reliability and efficiency of the work (for example, wheel mark erasing work) by the device main body 3 is improved. It is easy to suppress the decline in In this embodiment, since the device main body 3 includes the wheel mark erasing device 6 and the plurality of seeding units 5, it is easy to suppress a decrease in reliability and efficiency not only in the wheel mark erasing work but also in the seeding work.

Furthermore, in this embodiment, as described above, the support bars 72 of the plurality of support sections 7 each connected to the seeding unit 5 can be individually rotated (swung). Therefore, as each supporter 7 rotates, each seeding unit 5 individually moves in the vertical direction D1. Thereby, even when unevenness exists on the surface of the field G1, the position of each seeding unit 5 in the vertical direction D1 is adjusted individually, and excessive sinking or floating of each seeding unit 5 can be suppressed. As a result, it becomes easier to perform seeding work evenly in the plurality of seeding units 5. Moreover, by individually moving the plurality of work units (seeding unit 5) in the apparatus main body 3 in the vertical direction D1, the above-described vertical movement of the entire apparatus main body 3 becomes smoother.

Furthermore, in this embodiment, as the device main body 3 rises, the relative position of the fourth fulcrum 434 with respect to the first fulcrum 421 in plan view is displaced toward the vehicle main body 2 side. That is, the connecting device 4 has a first fulcrum 421 connected to the lower link 24 and a fourth fulcrum 434 connected to the upper link 25. Here, the relative position of the first fulcrum 421 and the fourth fulcrum 434 in the front-back direction D2 changes as the device main body 3 moves in the up-down direction D1. Specifically, as shown in FIG. 11, when the device main body 3 is displaced (raised) so as to be lifted upward, the fourth fulcrum 434 moves obliquely forward and upward, relative to the first fulcrum 421. It moves relatively to the vehicle body 2 side (that is, to the front). Thereby, even if the total length of the lower link 24 increases by the length of the arm member 42, the length of the upper link 25 is unlikely to be insufficient.

[3.2] Hopper open operation As described above, the seeding unit 5 (work unit) has the first posture with the target surface 50 facing above the horizontal, and the first posture with the target surface 50 facing below the horizontal. It is supported by the support part 7 so as to be rotatable between two postures. That is, by releasing the lock (connection with the front stay 722) of the lock portion 552 of the cover 55 to bring it into the "unlocked state", and rotating the cover 55 about the opening/closing fulcrum 551, FIGS. As shown in 13, the attitude of the seeding unit 5 is switched from the first attitude to the second attitude. The first posture is a working posture that is adopted during work (seeding work in this case), and the second posture is a non-working posture that is adopted when not working (including during maintenance of the working device 1, etc.). This is the attitude.

In this way, in the working device 1 according to the present embodiment, the attitude of the working unit (seeding unit 5) can be switched between the first attitude and the second attitude. Therefore, for example, by appropriately switching the posture of the working unit from the working posture when not working, it is possible to improve the maintainability of the apparatus main body 3.

12 and 13 show a state in which only one of the plurality of sowing units 5 (here, the leftmost one) is in the second posture, and in FIG. 13, the sowing unit 5 in the first posture is shown. is shown by an imaginary line (double-dashed line). That is, in this embodiment, the support section 7 is provided for each seeding unit 5, and the postures of the plurality of seeding units 5 can be switched individually. In this way, the device main body 3 has a plurality of work units (seeding units 5). These plurality of work units (seeding unit 5) are individually supported by the support section 7 in a rotatable state between the first attitude and the second attitude. Therefore, when performing maintenance on only an arbitrary work unit among a plurality of work units, by switching the posture of only the work unit concerned, there is no need to change the posture of unnecessary work units, and maintenance of the device main body 3 can be performed. It leads to improved sexual performance.

Further, in the present embodiment, the work unit includes a dispersion unit (seeding unit 5) that performs a dispersion operation (seeding operation) of a dispersion material (seeds here), and the target surface 50 is a container containing a dispersion material. This is one surface (here, the upper surface of the hopper 53). Therefore, for example, when discharging the seeds remaining in the hopper 53 from the opening surface (top surface) of the hopper body 531 after completing the sowing operation, by setting the seeding unit 5 in the second posture, the opening of the hopper body 531 can be discharged. Seeds can be discharged all at once from the surface. That is, as shown in FIGS. 12 and 13, by setting the upper surface (target surface 50) of the hopper 53 in the second posture facing downward, the seeds in the hopper 53 can be discharged all at once, and the work unit Improves maintainability.

Furthermore, in this embodiment, as shown in FIG. 12, when the work unit (seeding unit 5) is in the second posture, the pair of feed rolls 543 are exposed upward. Thereby, by placing the sowing unit 5 in the second position, maintenance such as removing seeds attached to the pair of feed rolls 543 can be easily performed. Further, each of the pair of feed rolls 543 is configured to be able to manually adjust the size (dimension in the left-right direction D3) of the plurality of recesses formed on the circumferential surface thereof. Specifically, by manually rotating the rotation operation unit provided on each feed roll 543 around the driven shaft 545, it is possible to change the sizes of the plurality of recesses using a "screw mechanism." The amount of seeds that each feed roll 543 feeds out in one rotation varies depending on the size of the recess, so by adjusting the size of the recess, it is possible to adjust the amount of seeds that are discharged in one rotation of each feed roll 543. becomes.

[4] Modification Examples Modification examples of the first embodiment will be listed below. The modified examples described below can be applied in combination as appropriate.

The shapes, dimensions, etc. of each part of the device main body 3 and the coupling device 4 are not limited to the aspects described in the first embodiment. Further, in the first embodiment, the working device 1 is exemplified as a “10-row type” having five seeding units 5 each having a pair of drive wheels 52 and a pair of discharge portions 544, but the present invention is not limited to this configuration. For example, "for 2 rows" having one seeding unit 5 having one pair of drive wheels 52 and discharge portions 544, "for 4 rows" having two sowing units, "for 6 rows" having three sowing units, and "for 8 rows" having four sowing units 5. For example, it may be for 12 rows having 6 rows. Furthermore, each seeding unit 5 may have one driving wheel 52 and one discharge part 544, or three or more each.

Further, the work unit is not limited to the sowing unit 5, and may include a spraying unit that sprays a spray material such as fertilizer or a chemical solution. Alternatively, the work unit may include work units other than the dispersion unit.

Further, in the first embodiment, an example was shown in which not only the wheel mark erasing device 6 but also the seeding unit 5 was connected to the rear side of the vehicle body 2, but it is also possible to connect and use only the wheel mark erasing device 6. You can also do it. Furthermore, the wheel mark erasing device 6 may not include the ground leveling body 62 and may include only the plurality of earth grading bodies 61.

In the first embodiment, the plurality of seeding units 5 are configured to be individually movable in the vertical direction D1, but this configuration is not essential to the working device 1. That is, the plurality of seeding units 5 may be directly fixed to the coupling device 4 or the wheel mark erasing device 6, for example.

Further, in the first embodiment, the support bar 72 is handled as a set with the attachment part 71 that constitutes the support part 7, but the present invention is not limited to this, and the support bar 72 and the attachment part 71 may be handled separately. good. For example, the support bar 72 (including the rear stay 721 and the front stay 722) is provided as a part accompanying the seeding unit 5 (work unit), and is combined with the attachment part 71 to constitute the support part 7. Good too.

1 Trailed work device 2 Vehicle main body 3 Device main body 5 Seeding unit (work unit, spreading unit)
7 Support part 10 Work vehicle 50 Target surface 52 Drive wheel 52A First drive wheel 52B Second drive wheel 53 Hopper (container)
543 Feeding roll 544 Discharging section 56 Hole section D1 Vertical direction

Claims (9)

comprising a device main body connected to a vehicle main body of a work vehicle and towed by the vehicle main body,
The apparatus main body has a working unit and a support part that supports the working unit,
The support section is configured to allow the work unit to rotate between a first attitude in which the target surface of the work unit is directed above the horizontal, and a second posture in which the target surface is directed below the horizontal. To support,
Trailed work equipment. The work unit includes a spraying unit that performs spraying work of spraying material,
The target surface is one surface of a container that accommodates the spray material,
The towed working device according to claim 1. The device main body has a plurality of work units,
The plurality of work units are supported by the support section in a state where they can be individually moved in the vertical direction.
The towed working device according to claim 1 or 2. The device main body has a plurality of work units,
The plurality of work units are individually supported by the support section in a rotatable state between the first attitude and the second attitude.
The towed working device according to any one of claims 1 to 3. The work unit includes a drive wheel that rolls as the vehicle body travels.
The towed working device according to any one of claims 1 to 4. The work unit includes a pair of delivery rolls that rotate with the rolling of the drive wheels, and a pair of discharge parts that respectively discharge waste at a timing synchronized with the rotation of the pair of delivery rolls,
The pair of feed rolls rotate in synchronization with each other.
The towed working device according to claim 5. When the work unit is in the second attitude, the pair of feed rolls are exposed upward;
The towed working device according to claim 6. The work unit includes a first drive wheel and a second drive wheel connected by the same drive shaft as the drive wheels,
A plurality of openings are provided at different positions in the circumferential direction on the outer periphery of each of the first drive wheel and the second drive wheel,
The towed working device according to any one of claims 5 to 7. The towed working device according to any one of claims 1 to 8,
The vehicle body;
work vehicle.