JP2020048581A - Work vehicle - Google Patents

Abstract

To improve workability.SOLUTION: A work vehicle includes a loading part 50 provided to a travelling vehicle body 2 capable of switching a state between a stacked state in which a plurality of loading bases 51 on which work materials are loaded are stacked vertically in multi-stages, and an expanded state in which the loading bases are expanded linearly from the stacked state. The loading part 50 fixes the work materials loaded on the loading bases 51 to the loading bases 51 in the stacked state, and releases the fixing of the work materials loaded on the loading bases 51 in the expanded state.SELECTED DRAWING: Figure 2A

Description

  The present invention relates to a work vehicle.

  BACKGROUND ART Conventionally, a working vehicle such as a seedling transplanter for planting seedlings while traveling in a field has a loading unit for placing working materials such as mat seedlings and fertilizer bags on one or both sides of a traveling vehicle body. Are known. Some of such loading units are capable of switching between a stacked state in which a plurality of loading tables are vertically stacked and overlapped in a plan view and an unfolded state in which the plurality of loading tables are linearly expanded in the front-rear direction (for example, And Patent Document 1).

Japanese Patent Application Laid-Open No. 2013-45

  Here, in the case where the loading section is used, for example, the work assistant loads the working material from the loading section in the unfolded state, the worker receives the working material on the machine body, and inputs the received working material to a predetermined location. Thereby, workability is improved.

  However, in the conventional work vehicle as described above, when the work material is placed on the loading table of the loading unit in a stacked state, the working material may slide off the loading table due to vibration or inclination of the body during work. Further, if the work material is heavy, it may be difficult to load the work material on the loading table of the loading section in the unfolded state, and the workability is reduced.

  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, a work vehicle (1) according to claim 1 is provided on a traveling vehicle body (2) and includes a plurality of loading tables (51) on which working materials are loaded. A stacking unit (50) capable of switching between a stacked state in which the stack is vertically stacked and an unfolded state in which the stacking state is linearly expanded; and the stacking unit (50) is configured such that the stacking table (51) in the stacked state. The work material loaded on the loading table (51) is fixed on the loading table (51), and the work material loaded on the loading table (51) in the unfolded state is unlocked.

  The work vehicle (1) according to claim 2 is the work vehicle (1) according to claim 1, wherein the loading section (50) is configured such that the loading table (51) deploys the work material in the deployed state. A movement assisting unit (53) for assisting movement in the direction, wherein the movement assisting unit (53) transfers the work material loaded on the loading table (51) in the stacking state of the loading unit (50) to The work material loaded on the loading table (51) is fixed on the loading table (51) and released when the loading section (50) is in the unfolded state.

  The work vehicle (1) according to claim 3 is the work vehicle (1) according to claim 2, wherein the movement assisting section (53) is provided on a bottom surface (512) of the loading table (51); It moves below the bottom surface (512) of the loading table (51) in the stacking state, and moves above the bottom surface (512) of the loading table (51) in the unfolded state. .

  The work vehicle (1) according to claim 4 is the work vehicle (1) according to claim 3, wherein the loading section (50) changes its attitude between the stacked state and the unfolded state while the loading table is changed. The apparatus further includes a frame (52) for supporting the (51), wherein the movement assisting portion (53) is pushed up by abutting on the frame (52) in the unfolded state and separated from the frame (52) in the stacked state. It is characterized by the following.

  A work vehicle (1) according to a fifth aspect is the work vehicle (1) according to any one of the first to fourth aspects, wherein the work vehicle (1) is provided on the left and right sides of the traveling vehicle body (2) so as to be able to move back and forth. A tip portion (12a) is provided detachably with respect to a base portion, and when the traveling vehicle body (2) travels in a field, a traveling reference line is formed in a field scene as the traveling vehicle body (2) travels. A marker (12) is further provided, and the loading section (50) is provided with a marker holding section (55) holding the tip (12a) of the marker (12).

  According to the first aspect of the present invention, in the stacked state of the loading section, the work material is fixed to the loading table, so that the working material is prevented from slipping off the loading table even while the machine body is working. Can be. Further, in the unfolded state of the loading section, the work material is released from being fixed, so that the work material can be easily loaded. That is, workability can be improved.

  According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, the work material, which is released and fixed in the unfolded state of the loading section, moves smoothly on the loading table by the movement assisting section. The work material can be more easily loaded. In addition, when the loading section is stacked, the work material is fixed to the loading table, so that even when the machine is working, the working material can be prevented from slipping off the loading table, and In the unfolded state, the work material is released from being fixed, so that the work material can be loaded easily. That is, workability can be improved.

  According to the third aspect of the present invention, in addition to the effect of the second aspect of the present invention, in the stacked state, the movement assisting part moves below the bottom of the loading table, so that the work material is loaded by its own weight. When the movement assisting unit moves upward above the bottom surface of the loading table in a deployed state, the movement assisting unit is interposed between the bottom surface and the work material to assist movement of the work material. Thereby, it is possible to prevent the work material from slipping off the loading table in the stacked state, and to improve the work material loadability in the unfolded state, thereby improving workability.

  According to the fourth aspect of the invention, in addition to the effect of the third aspect of the invention, the movement assisting portion is capable of moving forward and backward with respect to the bottom surface of the loading table by the frame whose posture is changed between the stacked state and the unfolded state. Becomes Specifically, in the unfolded state, the movement assisting portion comes into contact with the frame and is pushed up to protrude above the bottom surface of the loading table, and in the stacked state, the moving member moves away from the frame to be below the bottom surface of the loading table. Withdraw. Thus, the movement assisting section can be reliably operated according to the state of the loading section.

  According to the fifth aspect of the present invention, in addition to the effects of the first aspect of the present invention, when the marker is not used, the leading end is stored in the loading portion which becomes a part of the body. And the marker (tip) can be prevented from being lost.

FIG. 1 is a schematic left side view illustrating an example of the work vehicle according to the embodiment. FIG. 2A is a schematic left side view illustrating a stacked state and a developed state of the loading unit. FIG. 2B is a schematic plan view illustrating a state where the loading unit is expanded. FIG. 3A is a schematic left side view illustrating a stacked state and a developed state of a modification (part 1) of the loading unit. FIG. 3B is a schematic enlarged perspective view of a portion A in FIG. 3A. FIG. 4 is a schematic left side view showing the auxiliary stacking unit. FIG. 5 is a schematic left side view showing a modification of the auxiliary stacking unit. FIG. 6 is a schematic left side view showing the marker holding unit. FIG. 7A is a schematic plan view (part 1) showing a floor step and an extension step. FIG. 7B is a schematic plan view (part 2) showing a floor step and an extension step. FIG. 8 is a schematic perspective view showing the expanding step. FIG. 9A is a schematic perspective view showing a floor step and an extension step. FIG. 9B is an end view taken along line BB in FIG. 9A. FIGS. 10A and 10B are explanatory views of a detachable handrail, in which FIG. 10A is a plan view of the handrail, FIG. 10B is a side view of the handrail, and FIG. 10C is a rear view of the handrail. FIG. 11 is an explanatory view of a mounting portion of a detachable handrail. FIG. 12 is an explanatory view of attaching a detachable handrail. FIG. 13 is an explanatory view of a fixed type handrail, (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 diagram around a loading section and a fertilizer application apparatus according to another modification. FIG. 15A is a block diagram illustrating each unit related to the notification control (1) by the control unit. FIG. 15B is a block diagram illustrating each unit related to the notification control (part 2) by the control unit. FIG. 16A is an explanatory diagram (part 1) of a swing restriction structure for a rear wheel. FIG. 16B is an explanatory view (part 2) of the rear wheel swing restriction structure. FIG. 17A is a schematic left side view showing a seedling outlet and a spacer for densely sowing seedlings. FIG. 17B is a schematic rear view showing a seedling opening and a spacer for densely sowing seedlings. FIG. 18A is a schematic left side view showing a seedling outlet and a spacer for densely sowing seedlings. FIG. 18B is a schematic plan view showing a seedling outlet and a spacer for densely sowing seedlings. FIG. 18C is a schematic rear view showing a seedling outlet and a spacer for densely sowing seedlings. FIG. 19A is a schematic left side view showing a modified example of the seedling outlet and the spacer for densely sowing seedlings. FIG. 19B is a schematic plan view showing a modified example of the seedling opening and the spacer for densely sowing seedlings. FIG. 19C is a schematic rear view showing a modified example of the seedling opening and the spacer for densely sowing seedlings.

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

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

  In the following description, the front-rear direction is the traveling direction of the seedling transplanter 1 as a working vehicle when traveling straight, and the forward side of the traveling direction is defined as “front”, and the rear side is defined as “rear”. . The traveling direction of the seedling transplanter 1 is a direction from a cockpit 9 to a steering handle 10 described later when traveling straight (see FIG. 1).

  The left-right direction is a direction horizontally orthogonal to the front-rear direction. In the following, left and right are defined toward the “front” side. That is, the left hand side is “left” and the right hand side is “right” in a state where the worker (also referred to as a pilot) is seated in the cockpit 9 and faces forward. The vertical direction is a vertical direction. The front-rear direction, the left-right direction, and the up-down direction are orthogonal to each other.

  Note that these directions are defined for convenience in order to make the description easy to understand, and the present invention is not limited by these directions. In the following, the seedling transplanter 1 may be referred to as “machine”.

  As shown in FIG. 1, the seedling transplanter 1 includes a traveling vehicle body 2 that can travel 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 in which the front wheels 3 and the rear wheels 4 are driven. At the rear of the traveling vehicle body 2, a seedling planting section 30 that is driven up and down by the lifting device 20 is provided.

  The traveling vehicle body 2 includes a body frame 5, an engine E provided on the body frame 5, and a power transmission device 6 that transmits power generated by the engine E to drive wheels and a seedling plant 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 section 30.

  The engine E is disposed at a central portion of the traveling vehicle body 2 in the left-right direction, at a position protruding above a floor step 7 on which a worker who rides on the traveling vehicle body 2 places his or 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 of the traveling vehicle body 2 in the front-rear direction. The floor step 7 is provided from the front of the traveling vehicle body 2 to the rear of the engine E.

  The floor step 7 is mounted on the body frame 5. Of the floor steps 7, for example, a portion near the cockpit 9 described later is formed in a lattice shape in a plan view so that mud or the like attached to the shoes of the operator can be dropped on the field. Note that a rear step that also serves as a fender for the rear wheel 4 may be provided at the rear of the floor step 7.

  The engine E is covered by an engine cover 8. A cockpit 9 is provided above the engine cover 8. The power transmission device 6 includes a belt-type power transmission unit 6a to which power is transmitted from the engine E, and a hydraulic continuously variable transmission that is a transmission that changes the power transmitted from the engine E via the belt-type power transmission unit. And a transmission case 6b.

  The hydraulic continuously variable transmission is, for example, a hydrostatic continuously variable transmission called HST (Hydro Static Transmission). The output (rotational speed) and output direction (rotational direction) of the hydraulic continuously variable transmission can be changed by operating the main transmission lever. That is, the hydraulic continuously variable transmission can change the forward and backward traveling and 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 that transmits power from the engine E, which has been shifted by the hydraulic continuously variable transmission, to each unit. The transmission case 6b includes a sub-transmission mechanism that switches a traveling speed during traveling or work. When the auxiliary transmission 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 operation, a seedling planting speed during the planting operation, and the like. It is possible.

  As shown in FIG. 1, the traveling vehicle body 2 includes a cockpit 9 on a floor step 7. The cockpit 9 is a seat on which the operator sits when maneuvering. The traveling vehicle body 2 includes a steering handle 10 and a planting lever in front of a cockpit 9. The steering handle 10 is provided on the hood 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 a lever operated to raise and lower the seedling planting unit 30 and to start and stop planting of the seedling by the seedling planting unit 30.

  In addition, the traveling vehicle body 2 includes a main transmission lever and an auxiliary transmission lever. The main shift lever (also referred to as an HST lever) is a lever that is operated when changing the forward / backward traveling and traveling speed of the traveling vehicle body 2. The auxiliary transmission lever is a lever that is operated when switching the traveling speed of the traveling vehicle body 2 to a speed corresponding to a traveling location (a field or a road).

  The bonnet 11 is provided to protrude upward from the floor step 7 and is covered by a front cover 11a. The bonnet 11 is provided with, for example, a display unit (meter panel). The display unit has a display surface inclined backward and downward so as to face a worker who is seated on the cockpit 9 and faces forward.

  The display unit is, for example, a marker sensor that detects that a marker 12 (see FIG. 6), which forms a travel reference line that serves as a guideline for straight ahead in a field scene, appears on the left and right sides of the traveling vehicle body, a planting lever, Planting lever position sensor that detects the operation position of the fertilizer, a fertilizer out sensor that detects that the fertilizer stored in the storage hopper 41 of the fertilizer application device falls below a predetermined amount, and the fertilizer sent from the storage hopper 41 is supplied to the supply path. Displays information from various sensors such as a fertilizer clogging sensor that detects clogging.

  As shown in FIG. 1, the seedling transplanter 1 includes a lifting device 20 and a seedling plant 30. The lifting device 20 includes a lifting link 21. The elevating link 21 is a parallel link that connects the rear portion of the traveling vehicle body 2 and the seedling planting portion 30, and rotates vertically with respect to each of the link frame at the rear portion of the traveling vehicle body 2 and the seedling planting portion 30. By being freely connected, the seedling placement section 30 is connected to the traveling vehicle body 2 so as to be able to move up and down.

  The lifting device 20 includes a hydraulic lifting cylinder 22. The lifting cylinder 22 expands and contracts when the planting lever is operated and the hydraulic valve is switched. The elevating cylinder 22 drives the elevating link 21 by expanding and contracting to move the seedling placement part 30 up and down. That is, when the planting lever is operated, the raising / lowering cylinder 22 switches between the non-working position where the seedling planting part 30 is raised and the ground work position (planting position) where the seedling planting part 30 is lowered.

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

  The seedling mounting table 31 has a seedling mounting surface for the number of planting strips in the left-right direction of the machine body. Each seedling mounting surface is a downwardly inclined surface on which a plurality of mat seedlings (mat seedlings with soil) can be mounted in the vertical direction. The float 32 is leveled while sliding on a field scene in a field (paddy field) as the traveling vehicle body 2 moves. The float 32 includes a center float disposed at the center of the fuselage in the left-right direction of the fuselage, and a side float disposed outside the left-right direction with the center float interposed therebetween. In the illustrated example, the seedling transplanter 1 further includes a grading rotor 13 that is a grading device.

  Each float (center float and side float) of the float 32 is rotatably attached to the traveling vehicle body 2 such that the front part moves up and down in accordance with unevenness in 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 section 30, during the planting operation, the vertical movement of the front part of the center float is detected by the rotation sensor, and the control section 100 (see FIGS. 15A and 15B) described later according to the detection result of the rotation sensor. By switching the hydraulic valve that controls the expansion / contraction operation of the elevating cylinder 22, the seedling placement part 30 can be moved up and down to adjust the planting depth of the seedling.

  The planting device 33 is disposed below the seedling mounting table 31 by being supported by the planting support frame of the seedling mounting table 31. The planting device 33 plants the seedlings mounted on the seedling mounting table 31 in a 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 a seedling from a mat seedling placed on the seedling placing table 31 and plants it in a field scene. The implantation rod 331 is rotatably connected to the implantation transmission case 333.

  The rotary case 332 rotatably supports the implantation rod 331 and is rotatably connected to the planting transmission case 333. The rotary case 332 is provided with a non-uniform speed transmission mechanism capable of rotating the implantation rod 331 while changing the rotation speed of the implantation rod 331. The implantation 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 planting section 30 to the planting rod 331.

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

  As shown in FIG. 1, the seedling transplanter 1 includes, for example, a loading portion (also referred to as a spare seedling loading portion) 50 on one or both sides on the front side of the traveling vehicle body 2. The loading section 50 includes a plurality of loading tables 51. The loading table 51 has a pallet shape, 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 the plurality of loading tables 51 are vertically stacked in multiple stages and a stacked state in which the plurality of loading tables 51 are linearly expanded in the front-rear direction, for example. Is 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 illustrating the stacked state and the unfolded state of the loading unit 50. FIG. 2B is a schematic plan view illustrating a state where the loading unit 50 is unfolded. FIG. 2A shows both the stacked state and the unfolded state of the stacking unit 50. As described above, the seedling transplanter 1 (see FIG. 1) is provided with supplementary seedlings (preliminary seedlings) and fertilizer on one or both sides of the front of the traveling vehicle body 2 (see FIG. 1). A plurality of loading tables 51 (51a, 51b) on which working materials such as fertilizer bags are loaded are provided.

As shown in FIG. 2A, as described above, the loading unit 50 is in a stacked state in which a plurality of (for example, two) loading tables 51 (51 a, 51 b) are vertically stacked (for example, two levels) and overlapped. The stacking tables 51a and 51b in the stacked state can be switched between the unfolded state and the unfolded state. Here, in the stacking state, in the stacking state, the front loading table 51a is disposed above the rear loading table 51b whose position is fixed. Further, in the unfolded state, the loading section 50 is arranged in front of the rear loading table 51b by moving the front loading table 51a forward. In the example shown in FIGS. 2A and 2B, the loading unit 50 is configured to expand in the front-rear direction. However, 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 a worker's hand.

  The loading unit 50 includes a frame 52 provided on one of the left and right sides of the loading table 51 and connecting the front loading table 51a and the rear loading table 51b. A plurality of (for example, two) frames 52 are provided in front and rear, and constitute a rotating link mechanism for rotating the front loading table 51a in a direction indicated by an arrow X in the drawing.

  The frame 52 supports the front loading table 51a with respect to the rear loading table 51b while changing the posture of the loading section 50 between the stacked state and the unfolded state. That is, the posture of the frame 52 changes between the stacked state and the unfolded state of the stacking unit 50. Specifically, the frame 52 is attached to the rear loading table 52b, is rotatable in the front-rear direction about a first fulcrum (fixed fulcrum) 521 whose position is fixed, and is mounted on the front loading table 52b. It is attached to 51a and is rotatable 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 halfway in the unfolded state of the loading section 50. In this manner, the rigidity of the frame 52 can be increased by bending the frame 52 upward in the unfolded state of the loading unit 50. The portion beyond the bent portion of the frame 52 becomes a contact portion 523 that contacts the movement assisting portion 53 described later.

In the stacked state, the stacking section 50 fixes work materials (for example, mat seedlings and fertilizer bags) stacked on the stacking tables 51a and 51b on the bottom surfaces 512 of the stacking tables 51a and 51b. In the unfolded state, the loading unit 50 releases the fixing of the work materials loaded on the loading tables 51a and 51b. Here, the fixing of the work material means a state in which the work material cannot be moved on the loading table 51 (51a) and a state in which the work material is stably mounted on the loading table 51 (51a). is there. The release of the work material is a state in which the work material is movable on the loading table 51 (51a). In addition, the loading unit 50 includes a movement assisting unit 53 for releasing the work material on the bottom surfaces 512 of the loading tables 51a and 51b and assisting the movement of the work material in the developing direction.

  The movement assisting section 53 is provided on the bottom surface 512 of the loading table 51 (for example, the loading table 51a on the front side). The movement assisting section 53 includes a plurality (for example, two) of rollers 531 as movement assisting members arranged in the left-right direction. Each roller 531 is provided such that the direction of the rotation shaft 531 a is orthogonal to the transport direction of the work material (the developing direction of the loading unit 50, for example, the front-back direction), and is arranged in parallel on the bottom surface 512 of the loading table 51. . By providing the rollers 531 on the bottom surface 512 of the loading table 51 in this way, when the working material moves on the bottom surface 512 of the loading table 51, the movement (transport) load of the working material is reduced, and the load of the working material is reduced. Smooth movement is possible. The plurality of rollers 531 are connected by a connection shaft 532 parallel to the rotation shaft 531a.

  In addition, the movement assisting portion 53 is a protruding portion provided to protrude to the side of the loading table 51 at an end (left end) on the side where the frame 52 is provided, of the left and right ends of the connection shaft 532. 533. The protruding portion 533 is provided with a contact roller 533a serving as a contact portion on the side of the movement assisting portion 53 when the contact portion 523 of the frame 52 contacts with the unfolded state of the stacking portion 50. Further, the protruding portion 533 is formed in a crank shape and is disposed off the extension of the connecting shaft 532.

  The roller 531 moves below the bottom surface 512 of the loading table 51 in the stacked state of the loading unit 50, as shown in FIG. 2A. Further, the roller 531 moves above the bottom surface 512 of the loading table 51 in the unfolded state of the loading section 50. Specifically, the roller 531 is behind the frame 52 in the stacked state of the stacking 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 sunk below the bottom surface 512. Further, the roller 531 is above the frame 52 when the stacking unit 50 is in the unfolded state, and is pushed up when the contact roller 533a contacts the contact unit 523 of the frame 52. Thereby, the roller 531 can be automatically operated when the loading section 50 for moving the work material is deployed. That is, the roller 531 can be automatically operated when necessary.

  Heretofore, when the loading table is provided with a roller for assisting movement, the rollers remain protruding in the loading state of the loading section, and it has been difficult to stabilize the work material on the loading table. As described above, by using the retractable roller 531, the work material can be fixed on the loading table 51 (51 a) in the loading state of the loading section 50. On the other hand, in the case where the loading table is not provided with the rollers for movement assistance, the movement of the work material may not be smooth in the unfolded state of the loading section. However, as described above, the roller 531 is of a retractable type. Since the rollers 531 protrude from the bottom surface 512 of the loading table 51 (51a) in the unfolded state of the loading section 50, the work material becomes unstable on the loading table 51 (51a), and the work material can be released.

  Further, since the rollers 531 do not protrude from the bottom surface 512 of the loading table 51 in the stacked state of the loading section 50, they do not act on work materials. Thus, the work material can be stabilized on the bottom surface 512 by the weight of the work material loaded on the loading table 51. That is, the work material can be fixed on the bottom surface 512.

  The roller 531 is disposed at a predetermined distance d ahead of the existing roller, as shown in FIG. 2A, and cooperates with the existing roller so that the working material moving on the loading table 51 is continuously moved. Will work. Note that the roller 531 is preferably disposed about 250 mm ahead of the existing roller.

  Note that the movement assisting section 53 may be configured to include, for example, a slide pin extending in the developing direction of the stacking section 50, instead of the roller 531 as the movement assisting member. The slide pin is also of a retractable type like the roller 531, and protrudes above the bottom surface 512 of the loading table 51 when the loading section 50 is deployed.

  According to the above-described loading section 50, in the stacked state of the loading sections 50, the working material is fixed to the loading table 51 (51a), so that even when the machine body is in operation, the working material is removed from the loading table 51 (51a). Can be prevented from sliding down. Further, in the unfolded state of the loading section 50, the work material is released from being fixed, so that the work material can be easily loaded. That is, workability can be improved.

  In addition, the work material unlocked in the unfolded state of the loading unit 50 can be smoothly moved on the loading table 51 by the movement assisting unit 53, and the loadability of the work material is further improved. In addition, when the stacking unit 50 is in a stacked state, the work material is fixed to the loading table 51 (51a) by the movement assisting unit 53. Therefore, even when the machine body is working, the working material is removed from the loading table 51 (51a). It is possible to prevent the work material from slipping down, and when the loading table 51 (51a) is in the deployed state, the work material is released from being fixed, so that the work material can be loaded easily. That is, workability can be improved.

  Also, in the stacked state, the movement assisting unit 53 moves below the bottom surface 512 of the loading table 51 (51a), so that the work material is stabilized on the loading table 51 (51a) by its own weight, and in the unfolded state, the movement assisting unit 53 moves. When 53 moves above the bottom surface 512 of the loading table 51 (51a), the movement of the work material is assisted by being interposed between the bottom surface 512 and the work material. Thus, the work material can be prevented from slipping off from the loading table 51 (51a) in the stacked state, and the work material can be easily loaded in the unfolded state.

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

  Further, in the above-described loading section 50, when changing from the unfolded state to the stacked state, the assist section is provided to pull the front loading table 51a upward to the position in the stacked state, that is, above the rear loading table 51b. May be The assist unit is configured by, for example, connecting a middle 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 unit 50 is in the unfolded state, the spring member extends along the longitudinal direction of the frame 52 and assists the loading table 51a on the front side that moves so that the loading unit 50 is in a stacked state.

<Modified example of loading unit 50>
Here, a modification of the stacking unit 50 (stacking 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 developed state of a modified example of the loading unit 50 (the loading unit 50A). FIG. 3A shows both the stacked state and the unfolded state of the stacking section 50A. FIG. 3B is a schematic enlarged perspective view of a portion A in FIG. 3A.

  As shown in FIGS. 3A and 3B, the stacking unit 50A includes an assist unit 54. The assist portion 54 includes a pin 541a provided at an intermediate position of the front frame 52 and a pin 541b provided at a first fulcrum 521 of the rear frame 52 connected to the pin 541a via a spring member 542. Prepare. The spring member 542 is connected to a tip of the pin 541b provided at the first fulcrum 521, which is offset (offset) from an extension of the rotation axis of the first fulcrum 521. According to such a configuration, as shown in FIG. 3A, when the loading portion 50 </ b> A is deployed, the distal end of the pin 541 b provided at the first fulcrum 521 is disposed behind the first fulcrum 521, and the spring member 542 is attached. You can increase your power.

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

<Auxiliary loading unit 56>
Next, the auxiliary stacking section 56 will be described with reference to FIG. FIG. 4 is a schematic left side view showing the auxiliary stacking unit 56. The seedling transplanter 1 (see FIG. 1) includes working materials such as fertilizer bags on the left and right sides of the front of the traveling vehicle body 2 (see FIG. 1), for example, on the opposite sides of the loading section 50 (see FIG. 1). There may be a case where an auxiliary loading section 56 to be loaded is provided. As shown in FIG. 4, the auxiliary stacking unit 56 includes a plurality (for example, two) of auxiliary stacking tables 57.

  Further, as shown in FIG. 4, the two auxiliary stacking tables 57 are provided so as to be stacked in two upper and lower stages. The auxiliary loading section 56 is provided with a marker holding section 55 (see FIG. 4) for holding a tip portion (water wheel section) 12a of the marker 12 on a mounting plate 551, which is provided below the auxiliary loading table 57 disposed below. 6). FIG. 5 is a schematic left side view showing a modification of the auxiliary stacking section 56 (auxiliary stacking section 56A). As shown in FIG. 5, the auxiliary loading section 56A is provided such that three auxiliary loading tables 57 are stacked in three upper and lower stages.

<Marker holding unit 55>
Next, the marker holding unit 55 will be described with reference to FIG. FIG. 6 is a schematic left side view showing the marker holding unit 55. The loading unit 50 includes a marker holding unit 55 that holds the tip (watermill) 12a of the marker 12 when the marker 12 is not used. 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 able to move back and forth in order to form a travel reference line that serves as a guide for straight traveling in the field scene. In addition, the marker 12 has a distal end portion 12 a that is detachably attached to a base extending from the traveling vehicle body 2. When the marker 12 is not used, the distal end portion 12a is detached from the base portion and stored in a predetermined place.

  As shown in FIG. 6, the marker holding section 55 includes a clip 552 attached to an attachment plate 551 provided below the rear loading table, and a small hole 553 formed in the attachment 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 with the clip 552 and inserting the bent portion 121a of the rod 121 bent at a right angle into the small hole 553. I do.

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

<Extension step 71>
Next, the extension 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. FIG. In FIG. 7A, the extension step 71 is hatched. FIG. 8 is a schematic perspective view showing the extension step 71. FIG. 9A is a schematic perspective view showing the floor step 7 and the extension step 71. FIG. 9B is an end view taken along line BB in FIG. 9A. As shown in FIG. 7A, the floor step 7 is provided from a front portion of the traveling vehicle body 2 to a rear portion of the engine cover 8 that houses the engine E (see FIG. 1).

  As shown in FIG. 7A and FIG. 7B, an extension step (also referred to as a small step) 71 shown in FIG. As shown in FIGS. 9A and 9B, the extension step 71 is substantially the same as the floor step 7, and a hole 72 is formed in the step surface 71a. By forming the hole 72 in this manner, the operator can visually recognize the front wheel 3 (see FIG. 1) and the like from above the floor step 7. Also, the design is improved.

  As shown in FIGS. 7A, 7B, and 9A, an overhang portion (also referred to as a wide step) 73 is provided on one or both sides of the floor step 7. The above-described expansion step 71 is arranged between the front portion of the floor step 7 and the overhang portion 73 so as to be sandwiched therebetween. As described above, since the extension step 71 is disposed between the front part of the floor step 7 and the overhang portion 73, the extension step 71 fills the gap, and the area of the entire floor step 7 is also increased. Therefore, safety is improved. 9A and 9B, the left and right side edges of the floor step 7 are provided with protrusions 74 that are continuous in the front-rear direction. In this way, the provision of the projections 74 prevents slippage, thereby improving safety.

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

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

  As shown in FIG. 10, the detachable (left side) handrail 75 includes a main body 751 and a fixing portion 76. The main body part 751 is a pipe-shaped member and a member curved so that a straight one is folded. The fixing portion 76 is a plate-shaped member whose upper portion is bent, and is, for example, welded to both ends of the main body portion 751. Further, the fixing portion 76 includes holes 761 and 762. Of these, the hole 762 is formed in a bent portion. A fixture 763 (see FIG. 12) such as a bolt described later is inserted into the holes 761 and 762.

  As shown in FIG. 11, the attachment portion to which the handrail 75 is attached is an overhang portion 73 that projects outward from the above-described floor step 7 (see FIGS. 7A and 7B), and both ends of the pipe-like handrail 75. It has a pin 731 fitted into the hole 752 of the section. Then, as shown on the right side of FIG. 12, when attaching the handrail 75, the holes 752 at both ends of the handrail 75 are fitted into the pins 731 of the overhanging portion 73, and the fixing tool is inserted through the holes 761 of the fixing portion 76. By attaching the 763, the handrail 75 is fixed to the overhang portion 73.

  Further, the handrail 75 can be used for holding 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 attachment hole 732 of the overhanging portion 73 from above via the hole 762 of the fixing portion 76, so that the handrail 75 has both ends. The air blower 47 is fixed so as to sandwich the connection between the blower 47 and the air duct.

  As described above, the shape of the removable handrail 75 does not need to be changed to cope with the rotation of the blower 47. If the shape of the handrail is changed, the shape becomes different between the left and right sides. Therefore, there are various problems such as a decrease in design and an increase in the number of parts. However, such a problem occurs in the detachable handrail 75. Not even. Note that the detachable handrail 75 can be provided on a side where the blower 47 is not provided.

  Note that FIG. 13 shows a fixed handrail 77 that is a handrail 77 without a blower 47 on the left and right of the rear part of the traveling vehicle body 2. FIG. 13 is an explanatory view of the fixed type handrail 77, in which (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 771 of the handrail 77 is fixed to the overhang portion 73 by welding or the like.

<Other Modifications of Loading Unit 50 and Fertilizer Apparatus 40>
Next, another modification of the loading section 50 (50B) and the fertilizer applicator 40 (40B) will be described with reference to FIG. FIG. 14 is an explanatory diagram around a loading section 50B and a fertilizer applicator 40B according to another modification. The fertilizer application device 40B illustrated in FIG. 14 is a so-called side fertilizer device disposed on the left and right sides of the traveling vehicle body 2.

  As shown in FIG. 14, the loading section 50B, like the loading section 50 described above, has a stacked state in which a plurality of loading tables 51B are stacked in multiple stages and an unfolded state in which the plurality of loading tables 51B are linearly deployed. It is configured to be switchable. The switching of each state of the loading unit 50B is automatically performed by, for example, an electric actuator. The loading section 50B includes three loading tables 51Ba, 51Bb, and 51Bc.

  In the stacking state of the stacking unit 50B, the loading table 51Ba located at the center (referred to as a center loading table) is fixed in the stacked state and the unfolded state, and the loading table (front loading table) located below the center loading table 51Ba. 51Bb moves forward as indicated by the arrow Y1 in the drawing, and the loading platform (referred to as a rear loading platform) 51Bc located above the central loading platform 51Ba deploys. In this case, as shown by an arrow Y2 in the figure, the robot moves backward. The front loading platform 51Bb and the rear loading platform 51Bc are connected to the central loading platform 51Ba via respective rotating link mechanisms constituted by frames 52. Further, the front loading table 51Bb is configured by a loading table 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 fixed in the stacked state of the loading unit 50B moves forward when it is deployed, and therefore, for example, as shown in FIG. In addition, it is possible to prevent interference with the blower 14 provided at the rear of the fuselage during the movement during deployment. In addition, the front loading table 51Bb moves downward when changing from the unfolded state to the stacked state, so that, for example, the load on the electric actuator is reduced. In addition, since the front loading platform 51Bb is configured by a plurality (two) of loading platforms, the supply amount of working materials can be increased.

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

  Further, in the unfolded state of the loading section 50B, the storage hopper 41 and the blower 14 of the fertilizer 40B are arranged so as to fit within at least the left and right widths of the loading table 51B below the loading table 51B when viewed from the rear of the body. As a result, the width of the body can be reduced, and for example, the body can be loaded on a transport vehicle such as a light truck.

<Control Related to Fertilizer Apparatus 40>
Next, control related to the fertilizer application device 40 (40B) by the control unit 100 will be described with reference to FIGS. FIG. 15A and FIG. 15B are block diagrams showing respective units relating 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 applicator 40B. The powder sensor 101 detects fertilizer (powder) in the storage hopper 41. The powder sensor 101 is disposed above the feeding section 43 for feeding the fertilizer. The delivery shaft 44 of the delivery section 43 is provided with a delivery shaft rotation sensor 103 that detects the rotation of the delivery shaft 44.

  As shown in FIG. 15A, in the control related to the fertilizer application device 40B (see FIG. 14), when a fertilization failure in the fertilizer application device 40B and other defects in each part occur, the control unit 100 sends the notification to the notification unit 150. To inform. 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. The control unit 100 is connected to the notification unit 150. The notification unit 150 may be configured to include the lamp 151 and the buzzer 152 (see FIG. 15B).

  The control unit 100 outputs a signal to the notification unit 150 when a signal indicating that a decrease in fertilizer is detected is input from the powder sensor 101. The notification unit 150 notifies "fertilizer trouble". In this case, in the feeding section 43, when the amount of fertilizer decreases, the upper surface of the fertilizer becomes concave. As described above, since the powder sensor 101 is located above the fertilizer feeding section 43, it is possible to detect that the upper surface of the fertilizer has become concave, and the fertilizer is reduced in the storage hopper 41. Can be detected in the shortest time.

  Further, the control unit 100 receives a detection signal of the fertilizer height at the time of planting “input” by the fertilizer height sensor 102 after the turning of the machine body during work in the field, and a feeding shaft by the feeding shaft rotation sensor 103. When a rotation detection signal of 44 (see FIG. 14) is input and the lowering of the fertilizer height is stopped or the amount of lowering of the fertilizer height is smaller than a predetermined amount based on these detection signals, a notification is issued. The signal is output to the unit 150. The notification unit 150 notifies "fertilizer trouble". The control unit 100 performs such control for each planting step. In the planting process, since the fertilizer is replenished on the ridge side, a decrease in the fertilizer can be detected after the replenishment of the fertilizer, and the decrease in the fertilizer can be accurately grasped. In addition, when the fertilizer height sensor 102 detects an increase in the fertilizer height due to the fertilizer replenishment, the control unit 100 newly detects the fertilizer height in a state where the feeding shaft 44 is rotated at the time of “planting”. Then, the above control is continued. Thereby, it is possible to monitor the decrease in the fertilizer with the height of the fertilizer when the feeding of the fertilizer is restarted as the start time.

  In addition, when the ridge clutch lever position sensor 105 detects that the ridge clutch lever has been operated, for example, when it is detected that the fertilizer in two-row units has not decreased, the control unit 100 notifies the notification unit. No signal is output to 150. That is, notification of "fertilizer trouble" is not performed. 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 ridge has not been reduced. The signal is output to the unit 150. That is, notification of "fertilizer trouble" is performed. Thereby, for example, forgetting to return after using the first clutch can be prevented.

  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. The control unit 100 is connected to the notification unit 150. The notification unit 150 includes a lamp 151 and a buzzer 152. The control unit 100 receives a signal that the rearward movement of the aircraft is detected by the rear wheel rotation sensor 106 (and the back detection switch, etc.), and the center float 32 (see FIG. 14) is grounded to the field scene by the center float position sensor 107. When a signal indicating that is detected is input, a signal is output to the notification unit 150. The notification unit 150 notifies, for example, with a lamp 151 and a buzzer 152 that notify the clogging of fertilizer. The control unit 100 outputs a signal to the notification unit 150 to end the notification when any one of the operation of the buzzer stop switch, the start of planting, and the key-off is detected, for example.

  In this case, for example, it is possible to prevent the fertilizer from being clogged by notifying that the mud is clogged by the backward movement of the machine body.

  In addition, 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 outputs the signal to the center. The position of the float 32 (see FIG. 14) is controlled to change from “sensitive” to “insensitive”. In this case, the control unit 100 sets the position of the center float 32 to “sensitive” when the position of the center float 32 is lowered (that is, when it is shallow), and sets the position to “sensitive” when the position of the center float 32 is raised (that is, when it is deep). It is controlled to be "insensitive". As described above, the control unit 100 can perform optimal switching control.

  In addition, the control unit 100 outputs a signal to the notification unit 150 in accordance with the position of the hydraulic sensitivity detected by the hydraulic sensitivity sensor 109 from “sensitive” to “insensitive”, and outputs the signal to the center float 32 (see FIG. 14). Is controlled to change from “sensitive” to “insensitive”.

  In this case, the control unit 100 determines that the position of the center float 32 is "insensitive" and the position of hydraulic sensitivity is "insensitive" in a field where the hydraulic sensitivity position is "sensitive" because the topsoil is soft and the ditches are not easily clogged with mud. In the field of "", since the topsoil is hard and mud tends to be clogged in the trenching machine, the position of the center float 32 is controlled to be "sensitive". As described above, the control unit 100 can perform optimal switching control.

  In addition, the control unit 100 sets the rear wheel rotation sensor 106 to detect the rearward movement of the aircraft with a smaller number of counts as the position of the hydraulic sensitivity is “insensitive”, and detects the rearward movement of the aircraft by the rear wheel rotation sensor 106. When a signal is input and a signal indicating that the center float 32 (see FIG. 14) has touched the field scene by the center float position sensor 107 is input, a signal is output to the notification unit 150. In addition, the control unit 100 sets the planting depth lever position sensor 108 to detect the backward movement of the aircraft with a smaller count as the planting depth lever position is “deeper”. When a signal indicating that the body is moving backward is input and a signal indicating that the center float 32 has touched the field scene by the center float position sensor 107 is input, a signal is output to the notification unit 150. Thus, under conditions where mud is likely to be clogged in the trenching machine, the clogging of mud can be prevented by detecting the backward movement of the body with a shorter moving distance.

  In addition, as shown in FIG. 14, an image recognition device such as a camera whose front and upper portions are covered with a mudguard cover is provided in front of the seedling mounting table 31 of the seedling planting section 30. It is good also as composition which recognizes overflow of fertilizer based on a picturized picture. In this case, a means for rotating by the power of vertical sliding when the seedling mounting table 31 is moved up and down is provided, and as shown in FIG. 15B, the control unit 100 detects the overflow of the fertilizer from the fertilizing 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 overflow of fertilizer by the lamp 151 and the buzzer 152. That is, when one device (the seedling planting unit 30) is operated, the situation of the fertilizer hose 45 in a wide range is grasped, and when the overflow of the fertilizer is detected, a notification is made.

  Further, as shown in FIG. 14, for example, a weight detecting unit 46 for detecting the weight of the fertilizer is provided in a pipe portion holding the fertilizing hoses 45 of all the rows, and the control unit 100 controls the field in a state where the traveling vehicle body 2 is planted. If the weight detector 46 detects that the weight of the fertilizer in the fertilizer hose 45 continues to increase while traveling, the clogging of the fertilizer is detected. Thus, it is possible to detect the fertilizer accumulated in the fertilizer hose 45 and detect a clogged fertilizer even in an unmanned situation, for example.

<Swing restriction structure of rear wheel 4 (swing restriction part 60)>
Next, a swing restriction structure (swing restriction portion 60) of the rear wheel 4 will be described with reference to FIGS. 16A and 16B. FIG. 16A and FIG. 16B are explanatory views of a swing restriction structure (swing restriction section 60) of the rear wheel 4. FIG. FIG. 8A is a schematic view of the swing restriction structure (swing restriction section 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 periphery.

  As shown in FIG. 16A, the swing restricting section 60 restricts the vertical movement (swing) of the left and right rear wheels 4 (4L, 4R) by a predetermined angle (for example, 20 degrees) or more. The swing restricting section 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 indicated by the arrow Z in the drawing. The pendulum weight 61 swings left and right about the fulcrum 61a in accordance with the horizontal inclination of the body 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, a plurality (two) of small holes 62a are formed in the swing lock plate 62 so as to be vertically arranged. 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). ) And connected. When the pendulum weight 61 is, for example, a swing in which the left rear wheel 4L of the left and right rear wheels 4L and 4R rises and the right rear wheel 4R drops, the swing restricting portion 60 leans toward the right rear wheel 4R. 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 vertical swing amount of the left and right rear wheels 4L, 4R, the left and right rear wheels 4L, 4R can be regulated, and the tipping angle when the aircraft moves can be automatically improved. it can.

  In the above-described swing restricting section 60, the pendulum weight 61 is provided at the rear of the body, but for example, the pendulum weight 61 may be provided at the front of the body. With such a configuration, the pendulum weight 61 serves as a 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) is raised. With this configuration, the swing restricting portion 60 operates in a state where the seedling placement portion 30 is raised, that is, in a state where the body balance is poor, so that the falling angle can be more effectively improved.

<Seedling outlet 80 and spacer 90 for densely seeded seedlings>
Next, the seedling opening 80 for densely seeded seedlings will be described with reference to FIGS. 17A to 18C. FIG. 17A is a schematic left side view (partial cross section) showing the seedling outlet 80 and the spacer 90 for densely sowing seedlings. FIG. 17B is a schematic rear view showing the seedling outlet 80 and the spacer 90 for densely sowing seedlings. FIG. 18A is a schematic left side view showing the seedling outlet 80 and the spacer 90 for densely sowing seedlings. FIG. 18B is a schematic plan view showing the seedling outlet 80 and the spacer 90 for densely sowing seedlings. FIG. 18C is a schematic rear view showing the seedling outlet 80 and the spacer 90 for densely sowing seedlings.

  Here, when planting densely seeded seedlings, it is necessary to replace the seedling intake for conventional seedlings with the seedling intake for densely seeded seedlings in which the upper and lower widths and depths of the seedling intake are reduced. In this case, it is troublesome to remove the fastening members such as bolts and replace the seedling opening. Further, for example, when it is desired to separate densely seeded seedlings from conventional seedlings for each field, it is necessary to frequently change the seedling opening. For this reason, in the present embodiment, as shown in FIGS. 17A and 17B, by adjusting the upper and lower width and depth of the seedling opening 80 using the spacer 90, the conventional seedling and the densely seeded seedling are separated. Can be changed.

  As shown in FIG. 17A and FIG. 17B, a spacer 90 is attached to the upper part of the seedling opening 80 for conventional seedlings. Thus, the width and depth of the seedling opening 80 in the vertical direction are reduced, and the seedling opening 80 for densely seeded seedlings can be formed. Thereby, it is possible to change between the dense seeding and the conventional seedling simply by attaching or detaching the spacer 90, and it is not necessary to change the seedling opening 80, and the labor can be saved.

  As shown in FIGS. 18A, 18B, and 18C, the spacer 90 includes an engaging portion 91 and a vertical plate portion 92. The engagement portion 91 includes a hook 91a. As shown in FIG. 18B, the hook 91a fits into a hole 82 formed on the upper surface 81 of the seedling opening 80. Since the hook 91a is pushed back to the near side, the hook 91a is caught in the hole 82 and is prevented from falling off. The engaging portion 91 is engaged with the seedling opening 80 by the hook 91a provided on the lower plate being fitted into the hole 82 while sandwiching the upper surface between the upper and lower plates.

Further, the engaging portion 91 is formed such that the upper and lower plates spread in the depth direction.
Thereby, the attachment of the spacer 90 becomes easy.

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

  Also, as shown in FIG. 18A, the opening 83 is provided in the seedling opening 80. For example, when a spacer 90 is removed, a tool such as a screwdriver is inserted into the opening 83 so that the spacer 90 can be easily removed. Can be.

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

  As shown in FIGS. 19A, 19B, and 19C, a spacer 90A according to a modification includes an engaging portion 91A and a vertical plate portion 92A. The engagement portion 91A includes a hook 91Aa. The hook 91Aa fits into a 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 as shown in FIG. 19B to increase rigidity.

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

  Further effects and modifications can be easily derived by those skilled in the art. For this reason, the broader aspects of the present invention are not limited to the specific details and representative embodiments shown and described above. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and equivalents thereof.

1 work vehicle (seedling transplanter)
2 Running body 3 Front wheel 4 Rear wheel 4a Axle 5 Body frame 6 Power transmission device 6a Belt type power transmission unit 6b Transmission case 7 Floor step 8 Engine cover 9 Pilot seat 11 Bonnet 11a Front cover 12 Marker 12a Tip (watermill)
121 Rod 121a Bending part 13 Leveling device (Leveling rotor)
14 Blower 15 Handrail 20 Lifting device 21 Lifting link 22 Lifting cylinder 30 Seedling plant 31 Seedling table 32 Float 33 Planting device 331 Planting rod 332 Rotary case 333 Planting transmission case 40 Fertilizer device 41 Storage hopper 42 Cover portion 43 Feeding unit 44 Feeding shaft 45 Fertilizing hose 46 Weight detection unit 47 Blower 50 Loading unit 51 Loading table 51a Front loading table 51b Rear loading table 511 Side wall 512 Bottom surface 52 Frame 521 First fulcrum (fixed fulcrum)
522 Second fulcrum (moving fulcrum)
523 Contact part 53 Movement assisting part 531 Roller 531a Rotary shaft 532 Connecting shaft 533 Projection 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 table 60 Swing regulating part 61 Pendulum 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 (removable handrail)
751 body part 752 hole 76 fixing part 761 hole part 762 hole part 763 fixing tool 77 handrail (fixed handrail)
771 Main body part 80 Seedling opening 81 Top surface 82 Hole part 83 Opening part 90 Spacer 91 Engagement part 91a Hook 92 Vertical plate part 100 Control part 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 section 151 Lamp 152 Buzzer

Claims (5)

A loading portion is provided on the traveling vehicle body, and includes a loading portion capable of switching between a stacked state in which a plurality of loading tables on which working materials are loaded are stacked in upper and lower stages and a developed state in which the stacked state is linearly expanded from the stacked state.
The loading unit is configured to fix the work material loaded on the loading table on the loading table in the stacking state on the loading table, and to release the work material loaded on the loading table in the unfolded state. Work vehicle. The loading unit includes a movement assistance unit that assists movement of the work material in the deployment direction in the deployment direction in the unfolded state,
The movement assisting section fixes the work material loaded on the loading table on the loading table in the stacking state of the loading section on the loading table, and the work loaded on the loading table in the unfolded state of the loading section. The work vehicle according to claim 1, wherein the fixed material is released.   The movement assisting unit is provided on a bottom surface of the loading table, moves below the bottom surface of the loading table in the stacking state, and moves above the bottom surface of the loading table in the unfolded state. The work vehicle according to claim 2, wherein: The loading unit further includes a frame that supports the loading table while changing the orientation between the stacked state and the unfolded state,
4. The work vehicle according to claim 3, wherein the movement assisting section is pushed up by being brought into contact with the frame in the unfolded state and separated from the frame in the stacked state. 5. The traveling body is provided on the left and right sides so as to be able to move back and forth, and the tip is detachably provided with respect to the base. When the traveling body travels in a field, the traveling body travels in a field scene as the traveling body travels. Further comprising a marker forming a reference line,
The work vehicle according to any one of claims 1 to 4, wherein the loading unit includes a marker holding unit that holds the tip of the marker.

Images