JP6885454B2 - Work vehicle - Google Patents

Description

The present invention relates to a work vehicle.

Conventionally, in a work vehicle such as a seedling transplanter for planting seedlings while traveling in a field, a work vehicle equipped with a loading portion for loading work materials such as mat seedlings and fertilizer bags on either the left or right side or both sides of the traveling vehicle body. Are known. Some of such loading units can switch between a stacked state in which a plurality of loading platforms are stacked vertically and overlapped in a plan view, and a deployed state in which a plurality of loading platforms are linearly deployed in the front-rear direction (for example). , Patent Document 1).

Japanese Unexamined Patent Publication No. 2013-45

Here, in the scene where the loading unit is used, for example, the work assistant loads the work material from the loaded unit in the deployed state, the worker receives the work material on the machine body, and the received work material is put into a predetermined place. This improves workability.

However, in the conventional work vehicle as described above, when the work material is placed on the loading platform of the loading section in the laminated state, the working material may slip off the loading platform due to the vibration or tilt of the machine body during the work. Further, when the work material is a heavy object, it may be difficult to load the work material on the loading platform of the loading unit in the deployed state, and the workability is deteriorated.

The present invention has been made in view of the above, and an object of the present invention is to provide a work vehicle capable of improving workability.

In order to solve the above-mentioned problems and achieve the object, the work vehicle (1) according to claim 1 is provided on a traveling vehicle body (2), and a plurality of loading platforms (51) on which work materials are loaded are provided. The loading unit (50) is provided with a loading unit (50) capable of switching between a laminated state in which the products are stacked in multiple stages above and below and a deployed state in which the work material is linearly expanded from the stacked state. The loading unit (50) is the work material in the expanded state. A movement assisting portion (53) that assists the movement of the loading platform (51) in the deployment direction, and a frame (52) that supports the loading platform (51) while changing its posture between the laminated state and the deployed state. Prepare,
In the unfolded state, the bent portion formed in the frame (52) is in an upwardly bent posture, and the portion of the frame (52) beyond the bent portion is formed with the movement assisting portion (53). It is provided with a contact portion (523) to be contacted.
A contact roller (533a) that comes into contact with the contact portion (523) of the frame (52) in the deployed state is provided on the movement assisting portion (53).
The movement assisting portion (53) is provided with a roller (531) serving as a movement assisting member.
The roller (531) is provided on the bottom surface of the loading platform (51).
In the laminated state, it moves below the bottom surface of the loading platform (51), and in the deployed state, it moves above the bottom surface of the loading platform (51).
In the deployed state, the roller (531) is pushed up by the contact roller (533a) coming into contact with the contact portion (523) of the frame (52), and in the laminated state, the contact roller (52) comes into contact with the frame (52). When the contact roller (533a) is separated from the portion (523), the roller (531) moves below the mounting table (51).
The roller (531) acts on the work material loaded on the loading platform (51) in the deployed state, and the work material loaded on the loading platform (51) in the laminated state. It is characterized in that the roller (531) does not act.

The work vehicle (1) according to claim 2 is provided on the left and right side portions of the traveling vehicle body (2) in the work vehicle (1) according to claim 1, and the tip portion (12a) is provided. It is further provided with a marker (12) that is detachably provided with respect to the base and forms a progress reference line in the field scene as the traveling vehicle body (2) travels in the field. ,
The loading portion (50) includes a marker holding portion (55) that holds the tip portion (12a) of the marker (12).
The holding portion (55) includes a clip attached to a mounting plate (551) provided below the loading platform (50), (552), and a small hole (553) formed in the mounting plate (551). the provided, to grip the rod (121) of the tip portion by the clip (552) (12a), said rod (121) is characterized Rukoto is inserted the into small holes (553).

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According to the first aspect of the present invention, in the laminated state of the loading portions , the rollers do not act on the working materials loaded on the loading platform, so that the working materials can be removed from the loading platform even while the machine is working. It can be prevented from slipping off. In the expanded state of the stacking unit, the rollers order to effect, the loading of the work material becomes good to the working material stacked on the stacking table. That is, workability can be improved.

Further , since the roller acts in the deployed state of the loading portion by the movement assisting portion, the work material can be smoothly moved on the loading table, and the loadability of the work material is further improved. Further, by the movement auxiliary unit, in the stacked state of the loading unit, the roller does not act, Ru can be prevented airframe sliding off work material from even the stacking table a work.

In addition , since the movement assisting part moves below the bottom surface of the loading platform in the laminated state, the work material stabilizes on the loading platform by its own weight, and the moving assisting part moves above the bottom surface of the loading platform in the deployed state. By doing so, the movement of the work material is assisted by intervening between the bottom surface and the work material. As a result, it is possible to prevent the work material from slipping off the loading platform in the laminated state, and the loadability of the work material is improved in the deployed state, and the workability can be improved.

Further , the movement assisting portion can move forward and backward with respect to the bottom surface of the loading platform by the frame whose posture is changed between the stacked state and the deployed state. Specifically, in the deployed state, the contact roller of the movement assisting part abuts on the contact part of the frame and is pushed up so that it protrudes above the bottom surface of the loading platform, and in the laminated state, the moving member separates from the frame. Retract below the bottom of the loading platform. As a result, the movement assisting portion can be reliably operated according to the state of the loading portion.

According to the invention described in claim 2, in addition to the effect of the invention according to claim 1, it can be stored in the stacking unit serving as part of the fuselage of the tip during nonuse of the marker, the marker ( It is possible to prevent the tip) from being lost. Further, the holding portion includes a clip attached to a mounting plate provided below the loading platform and a small hole formed in the mounting plate, and the rod at the tip portion is gripped by the clip, and the rod is placed in the small hole. By being inserted, the tip of the marker can be held.

FIG. 1 is a schematic left side view showing an example of a work vehicle according to an embodiment. FIG. 2A is a schematic left side view showing a stacked state and a deployed state of the loading portion. FIG. 2B is a schematic plan view showing the loading portion when it is deployed. FIG. 3A is a schematic left side view showing a laminated state and an unfolded state of a modified example (No. 1) of the loading portion. FIG. 3B is a schematic enlarged perspective view of part A in FIG. 3A. FIG. 4 is a schematic left side view showing the auxiliary loading portion. FIG. 5 is a schematic left side view showing a modified example of the auxiliary loading portion. FIG. 6 is a schematic left side view showing the marker holding portion. FIG. 7A is a schematic plan view (No. 1) showing the floor step and the expansion step. FIG. 7B is a schematic plan view (No. 2) showing the floor step and the expansion step. FIG. 8 is a schematic perspective view showing the expansion step. FIG. 9A is a schematic perspective view showing a floor step and an expansion step. 9B is an end view taken along the line BB in FIG. 9A. 10A and 10B are explanatory views of a detachable handrail, which are (a) a plan view of the handrail, (b) a side view of the handrail, and (c) a rear view of the handrail. FIG. 11 is an explanatory view of a detachable handrail mounting portion. FIG. 12 is an explanatory view of attaching a removable handrail. 13A and 13B are explanatory views of a fixed handrail, which are (a) a plan view of the handrail, (b) a side view of the handrail, and (c) a rear view of the handrail. FIG. 14 is an explanatory view of the loading portion and the area around the fertilizer application device according to another modified example. FIG. 15A is a block diagram showing each unit related to notification control (No. 1) by the control unit. FIG. 15B is a block diagram showing each unit related to notification control (No. 2) by the control unit. FIG. 16A is an explanatory diagram (No. 1) of the swing regulation structure of the rear wheels. FIG. 16B is an explanatory diagram (No. 2) of the swing regulation structure of the rear wheels. FIG. 17A is a schematic left side view showing a seedling opening and a spacer for dense sowing. FIG. 17B is a schematic rear view showing a seedling opening and a spacer for dense sowing. FIG. 18A is a schematic left side view showing a seedling opening and a spacer for dense sowing. FIG. 18B is a schematic plan view showing a seedling opening and a spacer for dense sowing. FIG. 18C is a schematic rear view showing a seedling opening and a spacer for dense sowing. FIG. 19A is a schematic left side view showing a modified example of the seedling opening and the spacer for dense seedling. FIG. 19B is a schematic plan view showing a modified example of the seedling opening and the spacer for dense sowing. FIG. 19C is a schematic rear view showing a modified example of the seedling opening and the spacer for dense sowing.

Hereinafter, embodiments of the work vehicle disclosed in the present application will be described in detail with reference to the accompanying drawings. The present invention is not limited to the embodiments shown below.

<Overall configuration of work vehicle (seedling transplanter) 1>
The overall configuration of the work vehicle (seedling transplanter) 1 according to the embodiment will be described with reference to FIG. FIG. 1 is a schematic left side view showing an example of a work vehicle (seedling transplanter) 1 according to the embodiment. In the following, as the work vehicle 1 according to the embodiment, a seedling transplanting machine for planting seedlings on the topsoil surface (field scene) of the field while traveling in the field will be described as an example.

Further, in the following description, the front-rear direction is the traveling direction when the seedling transplanting machine 1 which is a work vehicle is traveling straight, and the front side of the traveling direction is defined as "front" and the rear side is defined as "rear". .. The traveling direction of the seedling transplanting machine 1 is a direction from the driver's seat 9 to the steering handle 10 described later when going straight (see FIG. 1).

The left-right direction is a direction that is horizontally orthogonal to the front-back direction. In the following, left and right are defined toward the "front" side. That is, when the worker (also referred to as the operator) is seated in the driver's seat 9 and faces forward, the left hand side is "left" and the right hand side is "right". The vertical direction is the vertical direction. The front-back direction, the left-right direction, and the up-down direction are orthogonal to each other.

It should be noted that these directions are defined for convenience in order to make the explanation easy to understand, and the present invention is not limited by these directions. Further, in the following, the seedling transplanting machine 1 may be referred to as an "aircraft".

As shown in FIG. 1, the seedling transplanting machine 1 includes a traveling vehicle body 2 capable of traveling in a field. The traveling vehicle body 2 includes a pair of left and right front wheels 3 and a pair of left and right rear wheels 4. The traveling vehicle body 2 is, for example, a four-wheel drive driven by the front wheels 3 and the rear wheels 4. A seedling planting portion 30 that is driven up and down by the elevating device 20 is provided at the rear portion of the traveling vehicle body 2.

The traveling vehicle body 2 includes an airframe frame 5, an engine E provided on the airframe frame 5, and a power transmission device 6 for transmitting the power generated by the engine E to the drive wheels and the seedling planting unit 30. That is, the power generated by the engine E, which is the power source, is used not only for moving the traveling vehicle body 2 forward or backward, but also for driving the seedling planting portion 30.

The engine E is arranged at the center of the traveling vehicle body 2 in the left-right direction, at a position protruding above the floor step 7 on which the operator on the traveling vehicle body 2 rests his / her feet. As the engine E, a heat engine such as a diesel engine or a gasoline engine is used. The floor step 7 is provided at the front portion of the traveling vehicle body 2 in the front-rear direction. The floor step 7 is provided from the front portion of the traveling vehicle body 2 to the rear portion of the engine E.

The floor step 7 is mounted on the airframe frame 5. Of the floor steps 7, for example, a part of the vicinity of the driver's seat 9, which will be described later, is formed in a grid pattern in a plan view so that mud and the like adhering to the shoes of the worker can be dropped on the field. A rear step that also serves as a fender for the rear wheels 4 may be provided at the rear of the floor step 7.

The engine E is covered with an engine cover 8. A cockpit 9 is provided above the engine cover 8. The power transmission device 6 is a belt-type power transmission unit 6a in which power is transmitted from the engine E and a hydraulic continuously variable transmission which is a transmission for shifting the power transmitted from the engine E via the belt-type power transmission unit. And a mission case 6b.

The hydraulic continuously variable transmission is, for example, a hydrostatic continuously variable transmission called HST (Hydro Static Transmission). In a hydraulic continuously variable transmission, the output (rotational speed) and the output direction (rotational direction) can be changed by operating the main transmission lever. That is, the hydraulic continuously variable transmission can change the forward / backward movement and the traveling speed of the traveling vehicle body 2 by changing the rotation speed and the rotation direction.

The transmission case 6b is provided with a transmission device for transmitting the power from the engine E, which has been changed by the hydraulic continuously variable transmission, to each part. The transmission case 6b includes an auxiliary transmission mechanism that switches the traveling speed during traveling or working. When the auxiliary shift lever is operated, the transmission case 6b switches the traveling speed of the traveling vehicle body 2 to, for example, a traveling speed higher than the traveling speed during the planting work, a seedling planting speed during the planting operation, or the like. It is possible.

As shown in FIG. 1, the traveling vehicle body 2 includes a cockpit 9 on the floor step 7. The driver's seat 9 is a seat on which the worker is seated during maneuvering. The traveling vehicle body 2 is provided with a steering handle 10, a planting lever, and the like in front of the cockpit 9. The steering handle 10 is provided on the bonnet 11 of the traveling vehicle body 2 and is operated by an operator to steer the traveling vehicle body 2. The planting lever is a clutch lever, which is provided on the bonnet 11 and is operated to raise and lower the seedling planting portion 30 and to start and stop planting seedlings by the seedling planting portion 30.

Further, the traveling vehicle body 2 includes a main shift lever and an auxiliary shift lever. The main speed change lever (also referred to as an HST lever) is a lever that is operated when the traveling vehicle body 2 moves forward and backward and changes the traveling speed. The auxiliary transmission lever is a lever that is operated when the traveling speed of the traveling vehicle body 2 is switched to a speed according to the traveling place (field or road).

Further, the bonnet 11 is provided so as to project upward from the floor step 7, and is covered with the front cover 11a. The bonnet 11 is provided with, for example, a display unit (meter panel). The display unit has a display surface that is inclined backward so as to face an operator who is seated in the driver's seat 9 and faces forward.

The display unit is, for example, a marker sensor and a planting lever that detect that a marker 12 (see FIG. 6), which will be described later, forms a progress reference line as a guideline for going straight in a field scene on the left and right sides of a traveling vehicle body. The planting lever position sensor that detects the operation position of the fertilizer, the fertilizer shortage sensor that detects that the amount of fertilizer stored in the storage hopper 41 of the fertilizer application device 40 has fallen below a predetermined amount, and the fertilizer sent from the storage hopper 41 is applied to the supply route. It displays information from various sensors such as a fertilizer clogging sensor that detects clogging.

As shown in FIG. 1, the seedling transplanting machine 1 includes an elevating device 20 and a seedling planting portion 30. The elevating device 20 includes an elevating link 21. The elevating link 21 is a parallel link connecting the rear portion of the traveling vehicle body 2 and the seedling planting portion 30, and rotates in the vertical direction with respect to each of the link frame and the seedling planting portion 30 at the rear portion of the traveling vehicle body 2. By being freely connected, the seedling planting portion 30 is connected to the traveling vehicle body 2 so as to be able to move up and down.

Further, the elevating device 20 includes a hydraulic elevating cylinder 22. The elevating cylinder 22 expands and contracts by operating the planting lever to switch the hydraulic valve. The elevating cylinder 22 drives the elevating link 21 by expanding and contracting to move the seedling planting portion 30 up and down. That is, the elevating cylinder 22 is switched to a non-working position in which the seedling planting portion 30 is raised and a ground working position (planting position) in which the seedling planting portion 30 is lowered by operating the planting lever.

As described above, the seedling planting portion 30 is attached to the rear portion of the traveling vehicle body 2 via the elevating link 21. The seedling planting section 30 can plant seedlings in a plurality of rows (rows), for example. The seedling planting section 30 includes a seedling placing table 31, a float 32, and a planting device 33.

The seedling placing table 31 has as many seedling placing surfaces as the number of planting rows in the left-right direction of the machine body. Each seedling loading surface is a downwardly sloping surface on which a plurality of mat seedlings (mat seedlings with soil) can be placed in the vertical direction. The float 32 is leveled while sliding on the field scene of the field (paddy field) as the traveling vehicle body 2 moves. The float 32 includes a center float arranged in the center of the machine body in the left-right direction of the machine body, and a side float arranged outside in the left-right direction with the center float in between. In the illustrated example, the seedling transplanting machine 1 further includes a ground leveling rotor 13 which is a ground leveling device.

Each float (center float and side float) of the float 32 is rotatably attached to the traveling vehicle body 2 so that the front portion moves up and down according to the unevenness of the field scene. The planting device 33 detects, for example, the vertical movement of the center float with a rotation sensor for controlling the angle of attack. In the seedling planting unit 30, the vertical movement of the front portion of the center float is detected by the rotation sensor during the planting operation, and the control unit 100 (see FIGS. 15A and 15B) described later according to the detection result of the rotation sensor. The seedling planting portion 30 can be raised and lowered by switching the hydraulic valve that controls the expansion and contraction operation of the elevating cylinder 22, and the seedling planting depth can be adjusted.

The planting device 33 is arranged below the seedling stand 31 by being supported by the planting support frame of the seedling stand 31. The planting device 33 plants the seedlings placed on the seedling placing table 31 in the field. The planting device 33 includes a planting rod 331, a rotary case 332, and a planting transmission case 333. The planting rod 331 takes seedlings from the mat seedlings placed on the seedling placing table 31 and plants them in the field scene. The planting rod 331 is rotatably connected to the planting transmission case 333.

The rotary case 332 rotatably supports the planting rod 331 and is rotatably connected to the planting transmission case 333. The rotary case 332 is provided with an unequal velocity transmission mechanism capable of rotating the implant rod 331 while changing the rotation speed of the implant rod 331. The implant rod 331 rotates while changing the rotation speed according to the rotation angle with respect to the rotary case 332. The planting transmission case 333 transmits the power transmitted from the engine E to the seedling planting section 30 to the planting rod 331.

As shown in FIG. 1, the seedling transplanting machine 1 includes a fertilizer application device 40. The fertilizer application device 40 is a device for spraying fertilizer on the field. In the seedling transplanting machine 1, fertilizer is sprayed on the field by the fertilizer application device 40 while planting seedlings in the field by the seedling planting unit 30. The fertilizer application device 40 is provided, for example, above the rear portion of the traveling vehicle body 2 and behind the cockpit 9. The fertilizer application device 40 includes a storage hopper 41 for storing fertilizer.

As shown in FIG. 1, the seedling transplanting machine 1 is provided with, for example, a loading portion (also referred to as a spare seedling loading portion) 50 on one or both of the left and right sides of the traveling vehicle body 2 on the front side. The loading unit 50 includes a plurality of loading platforms 51. The loading platform 51 is pallet-shaped and includes a pair of side walls 511 and a bottom surface 512 (see FIG. 2B). The loading unit 50 is configured to be able to switch between a stacked state in which a plurality of loading bases 51 are arranged in multiple stages in the vertical direction and overlapped in a plan view, and a deployed state in which the plurality of loading bases 51 are deployed linearly in the front-rear direction, for example. Will be done.

<Loading unit 50>
Next, the loading unit 50 will be further described with reference to FIGS. 2A and 2B. FIG. 2A is a schematic left side view showing a stacked state and a deployed state of the loading unit 50. FIG. 2B is a schematic plan view showing the loading unit 50 when it is deployed. Note that FIG. 2A shows both the stacked state and the unfolded state of the loading unit 50. As described above, the seedling transplanting machine 1 (see FIG. 1) has seedlings (spare seedlings) and fertilizer for replenishment on one or both sides of the front part of the traveling vehicle body 2 (see FIG. 1). A plurality of loading platforms 51 (51a, 51b) on which work materials such as fertilizer bags are loaded are provided.

As shown in FIG. 2A, as described above, the loading unit 50 is in a laminated state in which a plurality of (for example, two) loading platforms 51 (51a, 51b) are stacked in multiple upper and lower stages (for example, two stages). , It is possible to switch between the unfolded state in which the stacked loading platforms 51a and 51b are linearly unfolded. Here, in the loading unit 50, in the laminated state, the loading platform 51a on the front side is arranged above the loading platform 51b on the rear side whose position is fixed. Further, in the deployed state, the loading unit 50 is arranged in front of the loading platform 51b on the rear side by moving the loading platform 51a on the front side forward. In the examples shown in FIGS. 2A and 2B, the loading unit 50 is configured to expand in the front-rear direction, but for example, the loading unit 50 may be configured to expand in the left-right direction. Further, the loading unit 50 is rotatably supported by, for example, a support shaft (vertical shaft) protruding from the floor step 7, and can be freely rotated by an operator's hand.

The loading unit 50 is provided on either the left or right side of the loading platform 51, and includes a frame 52 that connects between the loading platform 51a on the front side and the loading platform 51b on the rear side. A plurality (for example, two) frames 52 are provided side by side in the front-rear direction, and form a rotation link mechanism for rotating the front loading platform 51a in the direction indicated by the arrow X in the drawing.

The frame 52 supports the loading platform 51a on the front side with respect to the loading platform 51b on the rear side while changing the posture between the stacked state and the deployed state of the loading unit 50. That is, the posture of the frame 52 changes depending on whether the loading unit 50 is stacked or unfolded. Specifically, the frame 52 is attached to the loading platform 52b on the rear side and can rotate in the front-rear direction around the first fulcrum (fixed fulcrum) 521 whose position is fixed, and the loading platform on the front side. It is attached to 51a and can rotate around a second fulcrum (moving fulcrum) 522 that moves in the front-rear direction.

Further, the frame 52 has a shape that is bent upward from the middle in the unfolded state of the loading portion 50. In this way, the frame 52 is bent upward in the unfolded state of the loading portion 50, so that the rigidity of the frame 52 can be increased. The portion of the frame 52 beyond the bent portion becomes a contact portion 523 that comes into contact with the movement assisting portion 53 described later.

In the laminated state, the loading unit 50 fixes the work materials (for example, mat seedlings and fertilizer bags) loaded on the loading platforms 51a and 51b on the bottom surface 512 of the loading platforms 51a and 51b. Further, the loading unit 50 releases the fixing of the work materials loaded on the loading platforms 51a and 51b in the deployed state. Here, fixing the work material means that the work material cannot be moved on the loading platform 51 (51a), and the working material is stably placed on the loading platform 51 (51a). is there. Unfixing the work material is a state in which the work material can be moved on the loading platform 51 (51a). Further, the loading unit 50 is provided with a movement assisting unit 53 in order to release the fixing of the work material on the bottom surfaces 512 of the loading platforms 51a and 51b and assist the movement of the work material in the deployment direction.

The movement assisting portion 53 is provided on the bottom surface 512 of the loading platform 51 (for example, the loading platform 51a on the front side). The movement assisting unit 53 includes rollers 531 which are a plurality of (for example, two) movement assisting members arranged in the left-right direction. Each roller 531 is provided so that the direction of the rotation axis 531a is orthogonal to the transport direction of the work material (the deployment direction of the loading portion 50, for example, the front-rear direction), and is arranged in parallel on the bottom surface 512 of the loading platform 51. .. By providing the roller 531 on the bottom surface 512 of the loading platform 51 in this way, when the work material moves on the bottom surface 512 of the loading platform 51, the movement (transportation) load of the work material is reduced, and the work material Smooth movement is possible. The plurality of rollers 531 are connected by a connecting shaft 532 parallel to the rotating shaft 531a.

Further, the movement assisting portion 53 is a protruding portion provided on the left and right ends of the connecting shaft 532 on the side where the frame 52 is provided (left end) so as to project sideways from the loading platform 51. 533 is provided. The protrusion 533 is provided with a contact roller 533a that serves as a contact portion on the movement assisting portion 53 side when the load portion 50 is in contact with the contact portion 523 of the frame 52 in the deployed state. Further, the protruding portion 533 is formed in a crank shape and is arranged off the extension line of the connecting shaft 532.

As shown in FIG. 2A, the roller 531 moves below the bottom surface 512 of the loading platform 51 in the stacked state of the loading unit 50. Further, the roller 531 moves above the bottom surface 512 of the loading platform 51 in the deployed state of the loading unit 50. Specifically, the roller 531 is behind the frame 52 in the laminated state of the loading unit 50. In this case, since the contact roller 533a is separated from the contact portion 523 of the frame 52, the roller 531 is in a state of being sunk below the bottom surface 512. Further, the roller 531 is above the frame 52 in the deployed state of the loading portion 50, and is pushed up by the contact roller 533a coming into contact with the contact portion 523 of the frame 52. As a result, the roller 531 can be automatically actuated when the loading unit 50 for moving the work material is deployed. That is, the roller 531 can be automatically actuated when necessary.

Until now, in the case where the loading platform is equipped with a roller for assisting movement, the roller remains protruding in the loading state of the loading section, and it is difficult to stabilize the work material on the loading platform. As described above, by making the roller 531 retractable, the work material can be fixed on the loading platform 51 (51a) in the loaded state of the loading unit 50. On the other hand, in the case where the loading platform is not provided with a roller for assisting movement, the movement of work materials may not be smooth in the deployed state of the loading portion. However, as described above, by making the roller 531 a retractable type, the roller 531 can be retracted. Since the roller 531 protrudes from the bottom surface 512 of the loading platform 51 (51a) in the deployed state of the loading section 50, the work material becomes unstable on the loading platform 51 (51a), and the work material can be unfixed.

Further, since the roller 531 does not protrude from the bottom surface 512 of the loading platform 51 in the laminated state of the loading unit 50, it does not act on the work material. As a result, the work material can be stabilized on the bottom surface 512 by the weight of the work material loaded on the loading platform 51. That is, the work material can be fixed on the bottom surface 512.

Further, as shown in FIG. 2A, the roller 531 is arranged in front of the existing roller by a predetermined distance d, and by cooperating with the existing roller, the roller 531 continuously moves the loading platform 51 with respect to the work material. It will work. The roller 531 is preferably arranged about 250 mm in front of the existing roller.

The movement assisting portion 53 may be configured to include, for example, a slide pin extending in the deployment direction of the loading portion 50 instead of the roller 531 as the movement assisting member. The slide pin is also retractable like the roller 531 and projects onto the bottom surface 512 of the loading platform 51 when the loading unit 50 is deployed.

According to the above-mentioned loading unit 50, since the work material is fixed to the loading platform 51 (51a) in the laminated state of the loading unit 50, the working material is fixed from the loading platform 51 (51a) even while the machine is working. Can be prevented from slipping off. Further, in the deployed state of the loading unit 50, the work material is unfixed, so that the loadability of the work material is improved. That is, workability can be improved.

In addition, the movement assisting unit 53 allows the work material that has been released from being fixed in the deployed state of the loading unit 50 to smoothly move on the loading platform 51, further improving the loadability of the work material. Further, since the work material is fixed to the loading table 51 (51a) by the movement assisting unit 53 in the laminated state of the loading unit 50, the work material can be removed from the loading table 51 (51a) even while the machine is working. It is possible to prevent the work material from sliding down, and in the deployed state of the loading platform 51 (51a), the work material is unfixed, so that the work material can be loaded easily. That is, workability can be improved.

Further, by moving the movement assisting portion 53 below the bottom surface 512 of the loading platform 51 (51a) in the laminated state, the work material is stabilized on the loading platform 51 (51a) by its own weight, and the moving assisting portion is in the deployed state. By moving the 53 above the bottom surface 512 of the loading platform 51 (51a), the movement of the work material is assisted by intervening between the bottom surface 512 and the work material. As a result, it is possible to prevent the work material from slipping off from the loading platform 51 (51a) in the laminated state, and the loadability of the work material is improved in the deployed state.

Further, since the movement assisting portion 53 can move forward and backward with respect to the bottom surface 512 of the loading platform 51 (51a) by the frame 52 whose posture is changed between the stacked state and the deployed state, the moving assisting portion 53 is moved according to the state of the loading portion 50. 53 can be operated reliably.

Further, the loading unit 50 described above is provided with an assisting unit that pulls the loading platform 51a on the front side toward the position of the stacked state, that is, upward of the loading platform 51b on the rear side when changing from the deployed state to the stacked state. May be done. The assist portion is configured by, for example, connecting an intermediate position of the front frame 52 and a first fulcrum (fixed fulcrum) 521 of the rear frame 52 with a spring member. When the loading portion 50 is in the deployed state, the spring member extends along the longitudinal direction of the frame 52 and assists the loading base 51a on the front side where the loading portion 50 moves so as to be in the laminated state.

<Modification example of loading unit 50>
Here, a modified example of the loading unit 50 (loading unit 50A) will be described with reference to FIGS. 3A and 3B. FIG. 3A is a schematic left side view showing a stacked state and a deployed state of a modified example of the loading unit 50 (loading unit 50A). Note that FIG. 3A shows both the stacked state and the unfolded state of the loading unit 50A. FIG. 3B is a schematic enlarged perspective view of part A in FIG. 3A.

As shown in FIGS. 3A and 3B, the loading unit 50A includes an assist unit 54. The assist portion 54 has a pin 541a provided at an intermediate position of the front frame 52 and a pin 541b provided at the first fulcrum 521 of the rear frame 52 connected to the pin 541a via a spring member 542. Be prepared. A spring member 542 is connected to the pin 541b provided on the first fulcrum 521 at a tip portion deviated (offset) from the extension line of the rotation axis of the first fulcrum 521. According to such a configuration, as shown in FIG. 3A, the tip end portion of the pin 541b provided on the first fulcrum 521 in the deployed state of the loading portion 50A is arranged behind the first fulcrum 521, and the spring member 542 is attached. You can increase your power.

Since the tip of the pin 541b provided on the first fulcrum 521 of the spring member 542 is laterally separated from the first fulcrum 521, the spring member 542 does not interfere with the first fulcrum 521 of the front frame 52. Further, the spring member 542 has a free length and the urging force is the minimum in the laminated state of the loading portion 50A, and the urging force is the maximum in the laminated state of the loading portion 50A. Therefore, a high urging force can be obtained when the loading portion 50A is changed from the deployed state to the laminated state.

<Auxiliary loading unit 56>
Next, the auxiliary loading unit 56 will be described with reference to FIG. FIG. 4 is a schematic left side view showing the auxiliary loading portion 56. In the seedling transplanting machine 1 (see FIG. 1), work materials such as fertilizer bags are placed on the left and right sides of the front portion of the traveling vehicle body 2 (see FIG. 1), for example, on the opposite side of the loading portion 50 (see FIG. 1). It may include an auxiliary loading unit 56 to be loaded. As shown in FIG. 4, the auxiliary loading unit 56 includes a plurality of (for example, two) auxiliary loading bases 57.

Further, as shown in FIG. 4, the two auxiliary loading platforms 57 are provided so as to be stacked in two upper and lower stages. The auxiliary loading portion 56 is a marker holding portion 55 (FIG. 5) that holds the tip end portion (water turbine portion) 12a of the marker 12 on a mounting plate 551 provided below the auxiliary loading base 57 arranged on the lower side. 6). Further, FIG. 5 is a schematic left side view showing a modified example of the auxiliary loading portion 56 (auxiliary loading portion 56A). As shown in FIG. 5, the auxiliary loading unit 56A is provided so that the three auxiliary loading bases 57 are stacked in three upper and lower stages.

<Marker holding unit 55>
Next, the marker holding portion 55 will be described with reference to FIG. FIG. 6 is a schematic left side view showing the marker holding portion 55. The loading portion 50 includes a marker holding portion 55 that holds the tip end portion (water turbine portion) 12a of the marker 12 when the marker 12 is not in use. As described above, the markers 12 are provided on the left and right sides of the traveling vehicle body (see FIG. 1) so as to be freely retractable in order to form a progress reference line as a guideline for traveling straight in the field scene. Further, the marker 12 is provided with a tip portion 12a detachably attached to a base portion extending from the traveling vehicle body 2. When the marker 12 is not in use, the tip portion 12a is removed from the base portion and stored in a predetermined place.

As shown in FIG. 6, the marker holding portion 55 includes a clip 552 attached to a mounting plate 551 provided below the loading platform on the rear side, and a small hole 553 formed in the mounting plate 551. The marker holding portion 55 holds the tip portion 12a of the marker 12 by gripping the rod 121 of the tip portion 12a by the clip 552 and inserting the bent portion 121a bent at a right angle of the rod 121 into the small hole 553. To do.

According to such a configuration, the tip portion 12a can be stored in the loading portion 50 which is a part of the machine body when the marker 12 is not used, and the tip portion 12a of the marker 12 can be prevented from being lost.

<Expansion step 71>
Next, the expansion step 71 will be described with reference to FIGS. 7A to 9B. 7A and 7B are schematic plan views showing the floor step 7 and the expansion step 71. In FIG. 7A, the expansion step 71 is shaded. FIG. 8 is a schematic perspective view showing the expansion step 71. FIG. 9A is a schematic perspective view showing the floor step 7 and the expansion step 71. 9B is an end view taken along the line BB in FIG. 9A. As shown in FIG. 7A, the floor step 7 is provided from the front portion of the traveling vehicle body 2 to the rear portion of the engine cover 8 accommodating the engine E (see FIG. 1).

As shown in FIGS. 7A and 7B, expansion steps (also referred to as small steps) 71 shown in FIG. 8 are provided on the left and right side portions in the front portion of the floor step 7. As shown in FIGS. 9A and 9B, the expansion step 71 has substantially the same surface as the floor step 7, and a hole 72 is formed in the step surface 71a. By forming the hole portion 72 in this way, the operator can visually recognize the front wheel 3 (see FIG. 1) and the like from above the floor step 7. In addition, the design is also improved.

Further, as shown in FIGS. 7A, 7B and 9A, an overhanging portion (also referred to as a wide step) 73 is provided on one or both of the left and right sides of the floor step 7. The expansion step 71 described above is arranged between the front portion of the floor step 7 and the overhanging portion 73 so as to be sandwiched between them. By arranging the expansion step 71 between the front portion of the floor step 7 and the overhanging portion 73 in this way, the expansion step 71 fills the gap, and the area of the entire floor step 7 is also expanded. Therefore, safety is improved. Further, as shown in FIGS. 9A and 9B, protrusions 74 continuous in the front-rear direction are provided on the left and right side edges of the floor step 7. By providing the protrusion 74 in this way, the non-slip portion is provided, so that the safety is improved.

Here, as shown in FIG. 7A, a blower 47 connected to a fertilizer application device (see FIG. 1) via an air duct is provided at either the left or right side end (for example, the left end) of the rear portion of the traveling vehicle body 2. Provided. The blower 47 is configured to be rotatable about 90 degrees toward the inside of the airframe during cleaning of the air duct, discharge of fertilizer, and other maintenance. The seedling transplanting machine 1 (see FIG. 1) is provided with a removable handrail 75 in order to avoid interference with the blower 47 when the blower 47 is rotated toward the inside of the machine body.

<Handrail 75>
Next, the removable handrail 75 will be described with reference to FIGS. 10 to 12. 10A and 10B are explanatory views of the removable handrail 75, which are (a) a plan view of the handrail 75, (b) a side view of the handrail 75, and (c) a rear view of the handrail 75. FIG. 11 is an explanatory view of a mounting portion (overhanging portion 73) of the removable handrail 75. FIG. 12 is an explanatory view of attachment of the removable handrail 75. The detachable handrail 75 is the left handrail provided with the blower 47 on the left and right sides of the rear portion of the traveling vehicle body 2 (see FIG. 7A).

As shown in FIG. 10, the removable (left side) handrail 75 includes a main body portion 751 and a fixing portion 76. The main body portion 751 is a pipe-shaped member and is a member in which a linear member is curved so as to be folded back. The fixing portion 76 is a plate-shaped member having a bent upper portion, and is welded, for example, to both ends of the main body portion 751. Further, the fixing portion 76 includes holes 761 and 762. Of these, the hole portion 762 is formed in the bent portion. Fixing tools 763 (see FIG. 12) such as bolts, which will be described later, are inserted into the holes 761 and 762.

As shown in FIG. 11, the mounting portion to which the handrail 75 is mounted is an overhanging portion 73 protruding outward from the floor step 7 (see FIGS. 7A and 7B) described above, and both ends of the pipe-shaped handrail 75. A pin 731 to be fitted into the hole 752 of the portion is provided. Then, as shown on the right side of FIG. 12, when the handrail 75 is attached, the holes 752 at both ends of the handrail 75 are fitted into the pins 731 of the overhanging portion 73, and the fixture is inserted through the hole 761 of the fixing portion 76. By attaching the 763, the handrail 75 is fixed to the overhanging portion 73.

Further, the handrail 75 can also be used to maintain the posture of the blower 47 rotated inside the machine body. In this case, as shown on the left side of FIG. 12, the fixing tool 763 is attached to the mounting hole 732 of the overhanging portion 73 from above via the hole portion 762 of the fixing portion 76, so that the handrail 75 is attached to both ends. The blower 47 is fixed so as to sandwich the connection portion with the air duct between the blowers 47.

As described above, it is not necessary to change the shape of the removable handrail 75 in order to correspond to the rotation of the blower 47. If the shape of the handrail is changed, the shape will be different on the left and right, so there are various problems such as deterioration of design and increase in the number of parts. However, the removable handrail 75 has such problems. There is no such thing. The removable handrail 75 can also be provided on the side where the blower 47 is not provided.

Note that FIG. 13 shows the handrail 77 on the left and right sides of the rear portion of the traveling vehicle body 2 without the blower 47, and is a fixed handrail 77. 13A and 13B are explanatory views of the fixed handrail 77, which are (a) a plan view of the handrail 77, (b) a side view of the handrail 77, and (c) a rear view of the handrail 77. In this case, the main body portion 771 of the handrail 77 is fixed to the overhanging portion 73 by welding or the like.

<Other modifications of the loading unit 50 and the fertilizer application device 40>
Next, another modification of the loading unit 50 (50B) and the fertilizer application device 40 (40B) will be described with reference to FIG. FIG. 14 is an explanatory view around the loading portion 50B and the fertilizer application device 40B according to another modified example. The fertilizer application device 40B illustrated in FIG. 14 is a so-called side fertilizer application device arranged on the left and right side portions of the traveling vehicle body 2.

As shown in FIG. 14, the loading unit 50B has a laminated state in which a plurality of loading bases 51B are stacked in multiple upper and lower stages and a deployed state in which the plurality of loading bases 51B are linearly deployed, as in the above-mentioned loading unit 50. It is configured to be switchable. Further, the switching of each state of the loading unit 50B is automatically performed by, for example, an electric actuator. The loading unit 50B includes three loading platforms 51Ba, 51Bb, and 51Bc.

In the stacked state of the loading unit 50B, the loading platform (referred to as the central loading platform) 51Ba located in the central portion is fixed in position in the stacked state and the deployed state, and the loading platform (front loading platform) located below the central loading platform 51Ba. 51Bb moves forward as shown by the arrow Y1 in the figure, and the loading platform (referred to as the rear loading platform) 51Bc located above the central loading platform 51Ba expands. In this case, it moves backward as shown by the arrow Y2 in the figure. The front loading platform 51Bb and the rear loading platform 51Bc are connected to the central loading platform 51Ba via a rotation link mechanism each composed of a frame 52. Further, the front loading platform 51Bb is composed of a loading platform having a plurality of upper and lower stages (two stages).

According to such a configuration, the front loading platform 51Bb located below the central loading platform 51Ba whose position is fixed in the stacked state of the loading section 50B moves forward when deployed, so that, for example, as shown in FIG. In addition, it is possible to prevent interference with the blower 14 provided at the rear of the machine body during movement during deployment. Further, since the front loading platform 51Bb moves downward when changing from the deployed state to the laminated state, the load applied to the electric actuator is reduced, for example. Further, since the front loading platform 51Bb is composed of a plurality (two) loading platforms, the amount of replenishment of work materials can be increased.

Further, as shown in FIG. 14, each loading platform 51B of the loading unit 50B is inclined upward from the front to the rear. In this case, the rear loading platform 51Bc arranged at the rear in the deployed state of the loading portion 50B is located in front of the lid portion 42 of the storage hopper 41 of the fertilizer application device 40B, and is provided on both side portions of the traveling vehicle body 2. It is located above the handrail 15 (which may be handrail 77 as shown in FIG. 12). That is, since the loading portion 50B is lower in the front than in the rear in the deployed state, the supply position of the work material is lowered and the supplyability is improved. Further, the rear loading platform 51Bc does not interfere with the lid 42 of the storage hopper 41, and the lid 42 can be opened even when the loading 50B is deployed, for example. Further, since the rear loading platform 51Bc does not interfere with the handrail 15, it is not hindered by the handrail 15 when receiving the work material. Further, even if the blower 14 different from the rotary blower 47 as shown in FIG. 7A is arranged in front of the storage hopper 41 of the fertilizer application device 40B, the loading portion 50B can be deployed.

Further, in the deployed state of the loading unit 50B, at least the storage hopper 41 and the blower 14 of the fertilizer application device 40B are arranged so as to fit within the left and right widths of the loading platform 51B below the loading platform 51B in the rear view of the machine body. As a result, the width of the airframe can be suppressed, and for example, the airframe can be loaded on a transport vehicle such as a light truck.

<Control related to fertilizer application device 40>
Next, the control related to the fertilizer application device 40 (40B) by the control unit 100 will be described with reference to FIGS. 14, 15A and 15B. 15A and 15B are block diagrams showing each unit related to notification control by the control unit 100. As shown in FIG. 14, a powder sensor 101 such as an ultrasonic sensor is provided on the lid 42 of the storage hopper 41 of the fertilizer application device 40B. The powder sensor 101 detects fertilizer (powder) in the storage hopper 41. The powder sensor 101 is arranged above the feeding portion 43 for delivering fertilizer. Further, the feeding shaft 44 of the feeding section 43 is provided with a feeding shaft rotation sensor 103 that detects the rotation of the feeding shaft 44.

As shown in FIG. 15A, in the control related to the fertilizer application device 40B (see FIG. 14), when a fertilizer application failure in the fertilizer application device 40B and other defects in each part occur, the control unit 100 informs the notification unit 150. Notify. As shown in FIG. 15A, a powder sensor 101, a fertilizer height sensor 102, a feeding shaft rotation sensor 103, a planting lever position sensor 104, a ridge clutch lever position sensor 105, and the like are connected to the control unit 100. Further, the notification unit 150 is connected to the control unit 100. The notification unit 150 may be configured to include a lamp 151 and a buzzer 152 (see FIG. 15B).

When the control unit 100 receives a signal from the powder sensor 101 that detects a decrease in fertilizer, the control unit 100 outputs a signal to the notification unit 150. The notification unit 150 notifies "fertilizer trouble". In this case, in the feeding portion 43, the upper surface of the fertilizer becomes concave as the fertilizer decreases. As described above, since the powder sensor 101 is located above the fertilizer feeding portion 43, it is possible to detect that the upper surface of the fertilizer is concave, and the fertilizer is decreasing in the storage hopper 41. Can be detected in the shortest time.

Further, the control unit 100 receives a signal for detecting the fertilizer height at the time of planting "entering" by the fertilizer height sensor 102 after turning the machine during work in the field, and the feeding shaft is fed by the feeding shaft rotation sensor 103. 44 (see FIG. 14) rotation detection signals are input, and based on these detection signals, a notification is given when the fertilizer height drop stops or when the fertilizer height drop amount is less than a predetermined amount. A signal is output to unit 150. The notification unit 150 notifies "fertilizer trouble". Further, the control unit 100 performs such control for each planting step. In the planting process, fertilizer is replenished at the ridge, so that the decrease in fertilizer can be detected after the fertilizer is replenished, and the decrease in fertilizer can be accurately grasped. Further, when the fertilizer height sensor 102 detects an increase in fertilizer height due to fertilizer replenishment, the control unit 100 newly detects the fertilizer height in a state where the feeding shaft 44 is rotated by the planting “on”. Then, the above control is continued. This makes it possible to monitor the decrease in fertilizer with the fertilizer height at the time of restarting fertilizer feeding as the starting point.

Further, the control unit 100 notifies the ridge clutch lever position sensor 105 when it is detected that the ridge clutch lever has been operated, for example, when it is detected that the fertilizer in units of two rows has not decreased. No signal is output to 150. That is, "fertilizer trouble" is not notified. Further, when the ridge clutch lever position sensor 105 detects that the ridge clutch lever has been returned to its original position, the control unit 100 notifies that the fertilizer corresponding to the article has not decreased. A signal is output to unit 150. That is, "fertilizer trouble" is notified. Thereby, for example, it is possible to prevent forgetting to return the clutch after using the one-row clutch.

As shown in FIG. 15B, a rear wheel rotation sensor 106, a center float position sensor 107, a planting depth lever position sensor 108, a hydraulic sensitivity sensor 109, and the like are connected to the control unit 100. Further, the notification unit 150 is connected to the control unit 100. The notification unit 150 includes a lamp 151 and a buzzer 152. The control unit 100 receives a signal that detects the reverse movement of the aircraft by the rear wheel rotation sensor 106 (and the back detection switch, etc.), and the center float 32 (see FIG. 14) touches the ground by the center float position sensor 107. When the signal that detects the above is input, the signal is output to the notification unit 150. The notification unit 150 notifies by, for example, a lamp 151 and a buzzer 152 that notify the fertilizer clogging. The control unit 100 outputs a signal to the notification unit 150 to end the notification when, for example, the operation of the buzzer stop switch, the start of planting, or the key-off is detected.

In this case, for example, it is possible to prevent fertilizer clogging by notifying that the groove making machine is clogged with mud due to the reverse movement of the machine body.

Further, the control unit 100 outputs a signal to the notification unit 150 according to the position of the planting depth lever detected by the planting depth lever position sensor 108 from “shallow” to “deep”, and also outputs a signal to the center. The position of the float 32 (see FIG. 14) is controlled to be either "sensitive" to "insensitive". In this case, the control unit 100 makes the position of the center float 32 "sensitive" when the position of the center float 32 is lowered (that is, when it is shallow), and makes the position "sensitive" when the position of the center float 32 is raised (that is, when it is deep). Control to be "insensitive". In this way, the control unit 100 can perform optimum switching control.

Further, the control unit 100 outputs a signal to the notification unit 150 according to the position from the “sensitive” to the “insensitive” of the hydraulic sensitivity detected by the hydraulic sensitivity sensor 109, and also outputs a signal to the center float 32 (see FIG. 14). The position of is controlled to be either "sensitive" to "insensitive".

In this case, the control unit 100 sets the position of the center float 32 to "insensitive" and the position of the hydraulic sensitivity to "insensitive" because the topsoil is soft and the groove making machine is less likely to be clogged with mud in the field where the position of the hydraulic sensitivity is "sensitive". In the field of "", the topsoil is hard and the groove making machine is easily clogged with mud, so the position of the center float 32 is controlled to be "sensitive". In this way, the control unit 100 can perform optimum switching control.

Further, the control unit 100 is set so that the rear wheel rotation sensor 106 detects the reverse movement of the aircraft with a count number as small as the position of the hydraulic sensitivity is "insensitive", and the rear wheel rotation sensor 106 detects the reverse movement of the aircraft. When the signal is input and the center float position sensor 107 detects that the center float 32 (see FIG. 14) has touched the field scene, the signal is output to the notification unit 150. Further, the control unit 100 is set so that the planting depth lever position sensor 108 detects the reverse movement of the aircraft with a smaller number of counts as the position of the planting depth lever becomes "deeper", and the rear wheel rotation sensor 106 determines. When a signal for detecting the reverse movement of the aircraft is input and a signal for detecting that the center float 32 has touched the field scene is input by the center float position sensor 107, a signal is output to the notification unit 150. As described above, under the condition that the groove making machine is easily clogged with mud, it is possible to prevent the clogged mud by detecting the reverse movement of the machine with a shorter moving distance.

Further, as shown in FIG. 14, an image recognition device such as a camera whose front and upper sides are covered with a mudguard cover is provided in front of the seedling placing table 31 of the seedling planting portion 30, and the image recognition device is used. The configuration may be such that the overflow of fertilizer is recognized based on the captured image. In this case, a means for rotating by the power of the vertical slide when raising and lowering the seedling placing table 31 is provided, and as shown in FIG. 15B, the control unit 100 detects the overflow of fertilizer from the fertilizer application hose 45 based on the image of the image recognition device. Then, a signal is output to the notification unit 150. The notification unit 150 notifies the fertilizer overflow by the lamp 151 or the buzzer 152. That is, by operating one device (seedling planting unit 30), the situation of the fertilizer application hose 45 in a wide range is grasped, and when the overflow of fertilizer is detected, it is notified.

Further, as shown in FIG. 14, for example, a weight detection unit 46 for detecting the weight of fertilizer is provided in a pipe portion holding the fertilizer application hose 45 of all the rows, and the control unit 100 is a field in a state where the traveling vehicle body 2 is planted. When the weight detection unit 46 detects that the weight of the fertilizer in the fertilizer application hose 45 continues to increase while traveling, the fertilizer clogging is detected. Thereby, the fertilizer accumulated in the fertilizer application hose 45 can be detected, and the fertilizer clogging can be detected even in an unmanned situation, for example.

<Swing regulation structure of rear wheel 4 (swing regulation unit 60)>
Next, the swing regulation structure (swing regulation unit 60) of the rear wheel 4 will be described with reference to FIGS. 16A and 16B. 16A and 16B are explanatory views of the swing regulation structure (swing regulation unit 60) of the rear wheel 4. Note that FIG. 8A is a schematic view of the swing regulation structure (swing regulation unit 60), and is a view (rear view) of the traveling vehicle body 2 as viewed from the rear. FIG. 16B is a schematic left side view of the rear wheel 4 and its surroundings.

As shown in FIG. 16A, the swing regulating unit 60 regulates the vertical movement (referred to as swing) of the left and right rear wheels 4 (4L, 4R) at a predetermined angle (for example, 20 degrees) or more. The swing regulating unit 60 includes a pendulum weight 61, a swing lock plate 62, and a cable 63. The pendulum weight 61 is provided at the center of the rear wheel 4 on the axle 4a so as to be swingable in the left-right direction as shown by the arrow Z in the drawing. The pendulum weight 61 swings left and right around the fulcrum 61a according to the inclination of the aircraft in the left-right direction due to the swing of the left and right rear wheels 4L and 4R.
The swing lock plates 62 (62L, 62R) are connected to the axle 4a at both left and right ends of the axle 4a and inside the left and right rear wheels 4L, 4R.

As shown in FIG. 16B, the swing lock plate 62 is formed with a plurality of (two) small holes 62a arranged one above the other. Further, as shown in FIG. 16A, the cable 63 (63L, 63R) is provided between the pendulum weight 61 and the swing lock plate 62 (62L, 62R), and the pendulum weight 61 and the swing lock plate 62 (62L, 62R) are provided. ) Is connected. In the case where the pendulum weight 61 is a swing in which the left rear wheel 4L is raised and the right rear wheel 4R is lowered among the left and right rear wheels 4L and 4R, the swing regulating unit 60 is closer to the right rear wheel 4R side as a fulcrum. The 61a side moves to the left. Along with this, the cable 63R connected to the right rear wheel 4R is pulled upward, and the right rear wheel 4R is pulled up. In this way, by reducing the amount of vertical swing of the left and right rear wheels 4L and 4R, the left and right rear wheels 4L and 4R can be regulated, and the tipping angle when the aircraft moves can be automatically improved. it can.

In the swing regulating unit 60 described above, the pendulum weight 61 is provided at the rear portion of the machine body, but for example, the pendulum weight 61 may be provided at the front part of the machine body. With such a configuration, the pendulum weight 61 can replace the balance weight, and the number of parts can be reduced. Further, the swing regulating unit 60 may be configured to act when the seedling planting unit 30 (see FIG. 1) rises. With such a configuration, the swing regulating unit 60 operates in a state where the seedling planting unit 30 is raised, that is, in a state where the airframe balance is poor, so that the tipping angle can be improved more effectively.

<Sapling opening 80 and spacer 90 for dense sowing>
Next, the seedling outlet 80 for dense seedling will be described with reference to FIGS. 17A to 18C. FIG. 17A is a schematic left side (partially cross-sectional) view showing a seedling intake 80 and a spacer 90 for dense seedlings. FIG. 17B is a schematic rear view showing a seedling opening 80 and a spacer 90 for dense seedlings. FIG. 18A is a schematic left side view showing a seedling opening 80 and a spacer 90 for dense seedlings. FIG. 18B is a schematic plan view showing a seedling intake 80 and a spacer 90 for dense seedlings. FIG. 18C is a schematic rear view showing a seedling opening 80 and a spacer 90 for dense seedlings.

Here, when planting densely sown seedlings, it is necessary to replace the seedling outlet for conventional seedlings with a seedling outlet for densely sown seedlings in which the width and depth above and below the seedling outlet are narrowed. In this case, it takes time and effort to remove the fastening member such as the bolt and replace the seedling outlet. Further, for example, when it is desired to separate densely sown seedlings and conventional seedlings for each field, it is necessary to frequently change the seedling intake. Therefore, in the present embodiment, as shown in FIGS. 17A and 17B, by adjusting the vertical width and depth of the seedling opening 80 by using the spacer 90, it is possible to use the conventional seedlings and the densely sown seedlings. It can be changed.

As shown in FIGS. 17A and 17B, a spacer 90 is attached to the upper part of the seedling opening 80 for conventional seedlings. As a result, the vertical width and depth of the seedling opening 80 are narrowed, and the seedling opening 80 for dense sowing can be formed. As a result, it is possible to change between densely sown seedlings and conventional seedlings simply by attaching or removing the spacer 90, and it is not necessary to replace the seedling opening 80, which saves time and effort.

As shown in FIGS. 18A, 18B and 18C, the spacer 90 includes an engaging portion 91 and a hanging plate portion 92. The engaging portion 91 includes a hook 91a. As shown in FIG. 18B, the hook 91a fits into the hole 82 formed in the upper surface 81 of the seedling opening 80. Since the hook 91a is pushed back toward the front side, the hook 91a is caught in the hole 82 to prevent it from coming off. The engaging portion 91 is engaged with the seedling taking port 80 by fitting the hook 91a provided in the lower plate into the hole portion 82 while sandwiching the upper surface between the upper and lower plates.

Further, the engaging portion 91 is formed so that the upper and lower plates spread in the depth direction. This facilitates the attachment of the spacer 90.

The hanging plate portion 92 is, for example, a leaf spring and has elasticity. The hanging plate portion 92 extends downward with the spacer 90 attached to the seedling opening 80. Further, the tip portion (lower end portion) of the hanging plate portion 92 is bent in the depth direction.

Further, as shown in FIG. 18A, since the seedling opening 80 is provided with the opening 83, for example, when removing the spacer 90, the spacer 90 can be easily removed by inserting a tool such as a screwdriver into the opening 83. Can be done.

FIG. 19A is a schematic left side view showing a modified example (spacer 90A) of the seedling opening 80 for dense sowing and the spacer. FIG. 19B is a schematic plan view showing a modified example (spacer 90A) of the seedling opening 80 for dense sowing and the spacer. FIG. 19C is a schematic rear view showing a modified example (spacer 90A) of the seedling opening 80 for dense sowing and the spacer.

As shown in FIGS. 19A, 19B and 19C, the spacer 90A according to the modified example includes an engaging portion 91A and a hanging plate portion 92A. The engaging portion 91A includes a hook 91Aa. As shown in FIG. 19B, the hook 91Aa fits into the hole 82 formed in the upper surface 81 of the seedling opening 80. As shown in FIG. 19B, the hook 91Aa is formed in a U shape to increase its rigidity.

The hanging plate portion 92A is, for example, a leaf spring and has elasticity. The hanging plate portion 92A extends downward with the spacer 90A attached to the seedling outlet 80. Further, the tip portion (lower end portion) of the hanging plate portion 92A is bent in the depth direction.

Further effects and variations can be easily derived by those skilled in the art. For this reason, the broader aspects of the invention are not limited to the particular details and representative embodiments expressed and described as described above. Therefore, various modifications can be made without departing from the spirit or scope of the general concept of the invention as defined by the appended claims and their equivalents.

1 Work vehicle (seedling transplanter)
2 Driving body 3 Front wheels 4 Rear wheels 4a Axles 5 Aircraft frame 6 Power transmission device 6a Belt type power transmission part 6b Mission case 7 Floor step 8 Engine cover 9 Driver's seat 11 Bonnet 11a Front cover 12 Marker 12a Tip (water wheel part)
121 Rod 121a Bending part 13 Ground leveling device (ground leveling rotor)
14 Blower 15 Handrail 20 Lifting device 21 Lifting link 22 Lifting cylinder 30 Seedling planting part 31 Seedling stand 32 Float 33 Planting device 331 Planting hose 332 Rotary case 333 Planting transmission case 40 Fertilizer application device 41 Storage hopper 42 Lid Feeding part 44 Feeding shaft 45 Fertilizer application hose 46 Weight detection part 47 Blower 50 Loading part 51 Loading base 51a Front loading base 51b Rear loading base 511 Side wall 512 Bottom surface 52 Frame 521 First fulcrum (fixed fulcrum)
522 Second fulcrum (moving fulcrum)
523 Contact part 53 Movement assist part 531 Roller 531a Rotating shaft 532 Connecting shaft 533 Protruding part 533a Contact roller 54 Assist part 541a Pin 541b Pin 542 Spring member 55 Marker holding part 551 Mounting plate 552 Clip 553 Small hole 56 Auxiliary loading part 57 Auxiliary loading platform 60 Swing regulation part 61 Pendant weight 62 Swing lock plate 62a Small hole 63 Cable 71 Expansion step (small step)
71a Step surface 72 Hole 73 Overhang (wide step)
731 pin 732 mounting hole 74 protrusion 75 handrail (detachable handrail)
751 Main body 752 Hole 76 Fixing part 761 Hole 762 Hole 763 Fixing tool 77 Handrail (fixed type handrail)
771 Main body 80 Seedling outlet 81 Top surface 82 Hole 83 Opening 90 Spacer 91 Engagement 91a Hook 92 Hanging plate 100 Control 101 Powder sensor 102 Fertilizer height sensor 103 Feeding shaft rotation sensor 104 Planting lever position sensor 105 Ridge Clutch Lever Position Sensor 106 Rear Wheel Rotation Sensor 107 Center Float Position Sensor 108 Planting Depth Lever Position Sensor 109 Hydraulic Sensitivity Sensor 150 Notification Unit 151 Lamp 152 Buzzer

Claims (2)

It is equipped with a loading unit that is provided on the traveling vehicle body and can switch between a stacked state in which a plurality of loading platforms on which work materials are loaded are stacked in multiple stages above and below and a deployed state in which the stacked state is linearly developed.
The loading unit includes a movement assisting unit that assists the movement of the work material in the deployment direction of the loading platform in the deployed state, and a frame that supports the loading platform while changing its posture between the stacked state and the deployed state. , With
In the unfolded state, the bent portion formed on the frame is in a bent upward posture, and the portion of the frame beyond the bent portion includes a contact portion that comes into contact with the movement assisting portion.
A contact roller that comes into contact with the contact portion of the frame in the deployed state is provided on the movement assisting portion.
The movement assisting portion is provided with a roller serving as a movement assisting member.
The rollers are provided on the bottom surface of the loading platform and move below the bottom surface of the loading platform in the laminated state, and move above the bottom surface of the loading platform in the deployed state.
In the deployed state, the roller is pushed up by the contact roller coming into contact with the contact portion of the frame, and in the laminated state, the contact roller is separated from the contact portion of the frame, so that the roller is placed on a mounting table. Move down and
It is characterized in that the roller acts on the work material loaded on the loading platform in the deployed state, and the roller does not act on the working material loaded on the loading platform in the laminated state. Work vehicle. The traveling vehicle body is provided on the left and right sides of the traveling vehicle body so as to be freely retractable and the tip portion is detachably provided with respect to the base portion. With additional markers to form the reference line
The loading portion includes a marker holding portion that holds the tip portion of the marker.
The holding portion includes a clip attached to a mounting plate provided below the loading platform and a small hole formed in the mounting plate, and the clip grips the rod at the tip portion and the small hole. working vehicle according to claim 1, characterized in Rukoto the rod is inserted into the hole.

Images