Work vehicle

Abstract

To address such a problem that it is difficult for a work vehicle such as a conventional vegetable transplanter to flexibly change an attitude of a seedling tray according to a work content.SOLUTION: A vegetable transplanter includes: a substantially U-shaped coupler plate member 70 for coupling a side seedling tray 50 with a center seedling tray 40, where one end of the coupler plate member 70 is rotationally coupled with an outer end of the center seedling tray 40 located on the side seedling tray 50 side, and the other end of the coupler plate member 70 is fixed to an inner end of the side seedling pedestal 50 located on the center seedling tray 40 side; and a gap closing plate member 51 erected downward on an endmost edge of the inner end of the side seedling tray 50 so as to prevent a gap from being formed between the endmost edge of the inner end of the side seedling tray 50 and the center seedling tray 40. when the side seedling tray 50 is rotated upward.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to work vehicles such as vegetable transplanters. [Background technology]

[0002] A transplanter is known that is equipped with a seedling supplying device that supplies seedlings to the traveling body, a planting device that receives the seedlings from the seedling supplying device and plants them in a field, a plant spacing switching mechanism that changes the spacing at which the planting device plants the seedlings, and a plant spacing switching member that operates the plant spacing switching mechanism, in which the plant spacing switching mechanism is composed of a first switching mechanism that greatly increases or decreases the plant spacing, and a second switching mechanism that slightly increases or decreases the plant spacing, and in which the first switching mechanism and second switching mechanism that transmit power to the seedling supplying device and the planting output mechanism that transmits power to the planting device are positioned on the upper side of the vehicle body (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-208414 A Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, the present inventor believes that the trend of implementing convenient functions one after another in work vehicles such as vegetable transplanters will continue to accelerate in consideration of the various needs of work vehicle users.

[0005] However, the present inventors have noticed that conventional work vehicles are not necessarily easy to use when using convenient functions.

[0006] More specifically, the present inventors have realized that with a work vehicle such as a conventional vegetable transplanter, it is difficult to say that the position of the seedling carrier can be flexibly changed depending on the type of work.

[0007] SUMMARY OF THE PRESENT DISCLOSURE In consideration of the above-mentioned problems with the conventional technology, an object of the present invention is to provide a work vehicle that can improve usability. [Means for solving the problem]

[0008] The first aspect of the present invention is a center seedling tray attached to the center in the left-right direction; Left and right side seedling racks are attached to the left and right sides of the center seedling rack, respectively, and are rotatable around a seedling rack rotation axis in the front-rear direction; It is equipped with A generally U-shaped connecting plate member is provided for connecting the side seedling tray to the center seedling tray, One end of the connecting plate member is rotatably connected to the outer end of the center seedling tray located on the side seedling tray side, The other end of the connecting plate member is fixed to the inner end of the side seedling tray located on the center seedling tray side, This work vehicle is characterized in that a gap closing plate member is erected downwardly on the innermost edge of the inner end of the side seedling loading table so that a gap does not occur between the innermost edge of the side seedling loading table and the center seedling loading table when the side seedling loading table is rotated upward.

[0009] The second aspect of the present invention is that a plurality of pin holes into which pins for selecting the rotation angle of the side seedling tray can be inserted are formed in the connecting plate member at a position near the seedling tray rotation axis, The pins inserted into the pin holes come into contact with the pin contact positions on the underside of the center seedling tray, thereby preventing the side seedling tray from rotating downward. The first aspect of the present invention is a work vehicle, characterized in that the pin abutment position is an inner position of the seedling tray rotating shaft in the left-right direction.

[0010] In the third aspect of the present invention, the convex portion of the connecting plate member abuts against the convex portion abutment position on the lower surface of the center seedling stand, thereby preventing the side seedling stand from rotating upward, A second aspect of the present invention is a work vehicle, characterized in that the protrusion abutment position is an outer position of the seedling loading platform rotation axis in the left-right direction.

[0011] The fourth aspect of the present invention is provided with a chute attached to the rear side of the center seedling tray, which is rotatable around the chute rotation axis in the left-right direction, The seedling tray flange is provided so as to rise from the front and rear sides of the side seedling tray and from the outer edge in the left-right direction, A chute flange is provided so as to rise from the rear side and the left and right edges of the chute, When the side seedling tray and the chute are rotated upward, a space is formed between the seedling tray flange rising from the rear edge and the chute flange rising from the left and right edges so that interference between the side seedling tray and the chute does not occur; A third work vehicle of the present invention is characterized in that a space concealing plate member is erected upward on the rear edge of the center seedling loading table so that the space is hidden when the side seedling loading table and the shooter are not rotated upward.

[0012] In the fifth aspect of the present invention, two frame members erected on a bumper member on the front side of the vehicle body support the center seedling tray from below at the upper ends of the two frame members, A fourth aspect of the present invention is a work vehicle, characterized in that a bridge reinforcement plate is attached between the two frame members.

[0013] The sixth aspect of the present invention is provided with a vehicle height adjustment mechanism for adjusting the height of a rear side of the vehicle body, The fifth aspect of the present invention is a work vehicle, characterized in that when the height of the rear side of the vehicle body is adjusted to be maximum, the inclination state of the bridging reinforcement plate becomes horizontal. Effect of the Invention

[0014] According to the first aspect of the present invention, it is possible to improve usability.

[0015] According to the second aspect of the present invention, in addition to the effect of the first aspect of the present invention, it is possible to simplify the configuration.

[0016] According to the third aspect of the present invention, in addition to the effect of the second aspect of the present invention, it is possible to further simplify the configuration.

[0017] According to the fourth aspect of the present invention, in addition to the effect of the third aspect of the present invention, it is possible to improve convenience.

[0018] According to the fifth aspect of the present invention, in addition to the effects of the fourth aspect of the present invention, it is possible to improve durability.

[0019] According to the sixth aspect of the present invention, in addition to the effect of the fifth aspect of the present invention, it is possible to reduce the burden on the worker. [Brief description of the drawings]

[0020] [Figure 1] FIG. 1 is a left side view of a vegetable transplanter according to an embodiment of the present invention. [Diagram 2] (a) is a perspective view (part 1) of the vicinity of the center seedling platform and the side seedling platform of the vegetable transplanter according to the embodiment of the present invention; (b) is a perspective view (part 2) of the vicinity of the center seedling platform and the side seedling platform of the vegetable transplanter according to the embodiment of the present invention; (c) is a perspective view (part 3) of the vicinity of the center seedling platform and the side seedling platform of the vegetable transplanter according to the embodiment of the present invention; (d) is a perspective view (part 4) of the vicinity of the center seedling platform and the side seedling platform of the vegetable transplanter according to the embodiment of the present invention. [Diagram 3](a) is a perspective view (part 5) of the vicinity of the center seedling tray and the side seedling tray of the vegetable transplanter according to the embodiment of the present invention; (b) is a perspective view (part 6) of the vicinity of the center seedling tray and the side seedling tray of the vegetable transplanter according to the embodiment of the present invention; (c) is a perspective view (part 7) of the vicinity of the center seedling tray and the side seedling tray of the vegetable transplanter according to the embodiment of the present invention [Figure 4] (a) An oblique view of the vicinity of the center seedling tray and the side seedling tray of the vegetable transplanter according to the embodiment of the present invention (part 8); (b) An oblique view of the vicinity of the center seedling tray and the side seedling tray of the vegetable transplanter according to the embodiment of the present invention (part 9); (c) An oblique view of the vicinity of the center seedling tray and the side seedling tray of the vegetable transplanter according to the embodiment of the present invention (part 10); (d) An oblique view of the vicinity of the center seedling tray and the side seedling tray of the vegetable transplanter according to the embodiment of the present invention (part 11) [Diagram 5] (a) is a perspective view of the vicinity of the center seedling tray and the side seedling tray of the vegetable transplanter according to the embodiment of the present invention (part 12); (b) is a perspective view of the vicinity of the center seedling tray and the side seedling tray of the vegetable transplanter according to the embodiment of the present invention (part 13); (c) is a perspective view of the vicinity of the center seedling tray and the side seedling tray of the vegetable transplanter according to the embodiment of the present invention (part 14). [Figure 6] FIG. 1 is an explanatory diagram of the configuration of the potato seedling frame angle adjustment bumper plate of the vegetable transplanter according to the embodiment of the present invention (part 1) [Figure 7] FIG. 2 is an explanatory diagram of the configuration of the potato seedling frame angle adjustment bumper plate of the vegetable transplanter according to the embodiment of the present invention (part 2) [Figure 8] (a) An explanatory diagram (part 3) of the configuration of the potato seedling frame angle adjustment bumper plate of the vegetable transplanter of the embodiment of the present invention, (b) An explanatory diagram (part 4) of the configuration of the potato seedling frame angle adjustment bumper plate of the vegetable transplanter of the embodiment of the present invention, (c) An explanatory diagram (part 5) of the configuration of the potato seedling frame angle adjustment bumper plate of the vegetable transplanter of the embodiment of the present invention [Figure 9](a) An explanatory diagram (part 6) of the configuration of the bumper plate for adjusting the angle of the potato seedling frame of the vegetable transplanter according to the embodiment of the present invention; (b) An explanatory diagram (part 7) of the configuration of the bumper plate for adjusting the angle of the potato seedling frame of the vegetable transplanter according to the embodiment of the present invention; (c) An explanatory diagram (part 8) of the configuration of the bumper plate for adjusting the angle of the potato seedling frame of the vegetable transplanter according to the embodiment of the present invention [Figure 10] FIG. 1 is an explanatory diagram of the potato seedling frame support structure of the vegetable transplanter according to the embodiment of the present invention; [Figure 11] FIG. 2(a) is an explanatory diagram (part 2) of a potato seedling frame support configuration of a vegetable transplanter according to an embodiment of the present invention; FIG. 2(b) is an explanatory diagram (part 3) of a potato seedling frame support configuration of a vegetable transplanter according to an embodiment of the present invention; [Figure 12] FIG. 4 is an explanatory diagram of a potato seedling frame support configuration of a vegetable transplanter according to an embodiment of the present invention; FIG. 5 is an explanatory diagram of a potato seedling frame support configuration of a vegetable transplanter according to an embodiment of the present invention; [Figure 13] FIG. 6 is an explanatory diagram of a potato seedling frame support configuration of a vegetable transplanter according to an embodiment of the present invention; FIG. 7 is an explanatory diagram of a potato seedling frame support configuration of a vegetable transplanter according to an embodiment of the present invention; [Figure 14] (a) An explanatory diagram (part 8) of a potato seedling frame support configuration of a vegetable transplanter according to an embodiment of the present invention, (b) An explanatory diagram (part 9) of a potato seedling frame support configuration of a vegetable transplanter according to an embodiment of the present invention [Figure 15] FIG. 11 is an explanatory diagram of a potato seedling frame support configuration of a vegetable transplanter according to an embodiment of the present invention; FIG. 12 is an explanatory diagram of a potato seedling frame support configuration of a vegetable transplanter according to an embodiment of the present invention; [Figure 16] (a) An explanatory diagram (part 12) of a potato seedling frame support configuration of a vegetable transplanter according to an embodiment of the present invention, (b) An explanatory diagram (part 13) of a potato seedling frame support configuration of a vegetable transplanter according to an embodiment of the present invention [Figure 17](a) An explanatory diagram (part 14) of the potato seedling frame support configuration of the vegetable transplanter according to the embodiment of the present invention, (b) An explanatory diagram (part 15) of the potato seedling frame support configuration of the vegetable transplanter according to the embodiment of the present invention [Figure 18] (a) An explanatory diagram (part 16) of the potato seedling frame support configuration of the vegetable transplanter according to the embodiment of the present invention, (b) An explanatory diagram (part 17) of the potato seedling frame support configuration of the vegetable transplanter according to the embodiment of the present invention [Figure 19] (a) An explanatory diagram (part 18) of the potato seedling frame support configuration of the vegetable transplanter according to the embodiment of the present invention, (b) An explanatory diagram (part 19) of the potato seedling frame support configuration of the vegetable transplanter according to the embodiment of the present invention [Figure 20] (a) An explanatory diagram (part 20) of a potato seedling frame support configuration of a vegetable transplanter according to an embodiment of the present invention, (b) An explanatory diagram (part 21) of a potato seedling frame support configuration of a vegetable transplanter according to an embodiment of the present invention [Figure 21] FIG. 1 is an explanatory diagram of the potato seedling frame angle adjustment configuration of the vegetable transplanter according to the embodiment of the present invention (part 1) [Figure 22] FIG. 2(a) is an explanatory diagram (part 2) of a potato seedling frame angle adjustment configuration of a vegetable transplanter according to an embodiment of the present invention; FIG. 2(b) is an explanatory diagram (part 3) of a potato seedling frame angle adjustment configuration of a vegetable transplanter according to an embodiment of the present invention; [Diagram 23] FIG. 4 is an explanatory diagram of the potato seedling frame angle adjustment configuration of the vegetable transplanter according to the embodiment of the present invention. [Figure 24] (a) An explanatory diagram (part 1) of the configuration of a potato seedling discharge port opening and closing unit of a vegetable transplanter according to an embodiment of the present invention; (b) An explanatory diagram (part 2) of the configuration of a potato seedling discharge port opening and closing unit of a vegetable transplanter according to an embodiment of the present invention; (c) An explanatory diagram (part 3) of the configuration of a potato seedling discharge port opening and closing unit of a vegetable transplanter according to an embodiment of the present invention; (d) An explanatory diagram (part 4) of the configuration of a potato seedling discharge port opening and closing unit of a vegetable transplanter according to an embodiment of the present invention. [Diagram 25]FIG. 5 is an explanatory diagram of a configuration of a potato seedling discharge port opening and closing unit of a vegetable transplanter according to an embodiment of the present invention; FIG. 6 is an explanatory diagram of a configuration of a potato seedling discharge port opening and closing unit of a vegetable transplanter according to an embodiment of the present invention; [Figure 26] (a) An explanatory diagram (part 1) of a motorized configuration of a vegetable transplanter according to an embodiment of the present invention, (b) An explanatory diagram (part 2) of a motorized configuration of a vegetable transplanter according to an embodiment of the present invention, and (c) An explanatory diagram (part 3) of a motorized configuration of a vegetable transplanter according to an embodiment of the present invention. [Figure 27] (a) An explanatory diagram (part 4) of the motorized configuration of the vegetable transplanter of the embodiment of the present invention, (b) An explanatory diagram (part 5) of the motorized configuration of the vegetable transplanter of the embodiment of the present invention, (c) An explanatory diagram (part 6) of the motorized configuration of the vegetable transplanter of the embodiment of the present invention DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS With reference to the drawings, an embodiment of the present invention will be described in detail.

[0022] The same applies below, but some components may not be shown in the drawings, or may be shown in a perspective or simplified manner.

[0023] The vegetable transplanter of the present embodiment is a specific example of the work vehicle of the present invention.

[0024] (1) First, referring primarily to Figures 1, 2(a) to 2(d), 3(a) to 3(c), 4(a) to 4(d), and 5(a) to 5(c), the configuration and operation of a vegetable transplanter according to an embodiment of the present invention will be specifically described.

[0025] Here, Figure 1 is a left side view of a vegetable transplanter of an embodiment of the present invention, and Figures 2(a) to 2(d), 3(a) to 3(c), 4(a) to 4(d) and 5(a) to 5(c) are oblique views (parts 1 to 14) of the vicinity of the center seedling tray 40 and side seedling tray 50 of the vegetable transplanter of the embodiment of the present invention.

[0026] The center seedling tray 40 is a unit attached to the center in the left-right direction. The left and right side seedling trays 50 are units attached to the left and right sides of the center seedling tray 40, respectively, and are rotatable around seedling tray rotation shafts 59 in the front-rear direction.

[0027] In the configuration in which seedlings are poured from the center seedling loading platform 40 to the rear shooter 60, the front part of the center seedling loading platform 40 can be tilted upward and the left and right side seedling loading platforms 50 can be folded in the left and right direction, so that the seedling loading platform rotation angle is firmly fixed in the adjusted position without so-called pinching that occurs when folding.

[0028] The posture of the side seedling loading platform 50 as a spare seedling frame can be flexibly changed depending on the work content, not only making it easy to handle bulbous crops such as potatoes by pouring them in, but also achieving high work efficiency with excellent visibility.

[0029] A generally U-shaped connecting plate member 70 is provided for connecting the side seedling rest 50 to the center seedling rest 40.

[0030] As shown in Figures 2(a), 2(b) and 2(c), the side seedling trays 50 are connected to both the left and right sides of the central seedling tray 40 by connecting plate members 70, and the shooter 60 extends backward so as to connect to the seedling cup device 101 having the so-called seedling cups. The seedling tray can be made compact by folding and storing the side seedling trays 50 in the expanded state provided on both sides. Since the side seedling trays 50 are rotatable, seedlings can be easily supplied to the seedling cup rotating table of the seedling cup device 101 via the shooter 60.

[0031] One end of the connecting plate member 70 is rotatably connected to the outer end of the center seedling loading table 40 located on the side seedling loading table 50 side. The other end of the connecting plate member 70 is fixed to the inner end of the side seedling loading table 50 located on the center seedling loading table 40 side.

[0032] 2(c), four connecting plate members 70 as pivot points for the side seedling racks 50, which can also function as stoppers, are provided at four locations in total at the front and rear of the left and right side seedling racks 50, and the angle at which the side seedling racks 50 are deployed can be adjusted by inserting and removing pins 80. For example, the side seedling racks 50 can be fixed at a preferred angle so that seedlings such as seed potatoes roll and gather in the center of the center seedling rack 40.

[0033] A gap closing plate member 51 is erected downward on the innermost edge of the side seedling loading table 50 so that a gap is not generated between the innermost edge of the side seedling loading table 50 and the center seedling loading table 40 when the side seedling loading table 50 is rotated upward.

[0034] As shown in Figure 3(a), the lower thickness of the gap closing plate member 51 attached below the removable seedling support frame bottom plate 102 is formed at the inner end of the side seedling support 50, so that even when the side seedling support 50 is fixed in an inclined position, the thickness barrier prevents seedlings such as seed potatoes from getting into the gap.

[0035] A plurality of pin holes 71, into which pins 80 for selecting the rotation angle of the side seedling tray 50 can be inserted, are formed in the connecting plate member 70 at positions near the seedling tray rotation shaft 59. When the pins 80 inserted into the pin holes 71 abut against a pin abutment position P1 on the underside of the center seedling tray 40, the side seedling tray 50 is prevented from rotating downward. The pin abutment position P1 is a position inside the seedling tray rotation shaft 59 in the left-right direction.

[0036] 2(d), the seedling-bearing-table rotation shafts 59 of the left and right side seedling-bearing tables 50 are provided near the gap between the side seedling-bearing tables 50 and the center seedling-bearing table 40, below the outer end of the center seedling-bearing table 40 in the left-right direction. The side seedling-bearing tables 50 in the inclined state are rotated and fixed so as to overlap the center seedling-bearing table 40 from above, so that seedlings such as seed potatoes can smoothly fall toward the center seedling-bearing table 40 without getting caught in the gap between the side seedling-bearing tables 50 and the center seedling-bearing table 40.

[0037] The protrusion 72 of the connecting plate member 70 abuts against the protrusion abutment position P2 on the underside of the center seedling platform 40, thereby preventing the side seedling platform 50 from rotating upward. The protrusion abutment position P2 is an outer position of the seedling platform rotation shaft 59 in the left-right direction.

[0038] As shown in Fig. 3(b), the protrusion 72, which is a part of the connecting plate member 70 that functions as a hinge portion, functions as a stopper portion, so the number of parts is reduced and the configuration is simplified. In addition, since the protrusion abutment position P2 is the underside of the rear side of the center seedling loading tray 40, scratches on the center seedling loading tray 40 that are likely to occur due to the protrusion abutment are not easily noticeable.

[0039] As shown in Fig. 3(c), of the left and right side seedling carrying tables 50, at least the left side seedling carrying table 50 in front of the on-board worker can be removed together with the connecting plate member 70. This improves safety as it does not get in the way of the on-board worker who wants to ensure forward visibility. Furthermore, the seedling carrying table flange members rising from the front and rear edges of the side seedling carrying tables 50 can be reattached to the outer end of the center seedling carrying table 40 after being removed, allowing the user to use the seedling carrying table in a simple configuration in which the side seedling carrying tables 50 are not used as seedling carrying tables, according to the user's preferences.

[0040] The shooter 60 is a unit attached to the rear side of the center seedling loading table 40 and is rotatable about a shooter rotation shaft 69 in the left-right direction.

[0041] 4(a) and 4(b), the shooter rotation shaft 69 of the shooter 60 is provided at a location below the rear end of the center seedling platform 40, near the joint between the shooter 60 and the center seedling platform 40. The shooter 60 in the inclined state is rotated and fixed so as to overlap the center seedling platform 40 from below, so that seedlings such as seed potatoes can smoothly fall toward the shooter 60 without getting caught in the gap between the shooter 60 and the center seedling platform 40.

[0042] Seedling-carrying tray flanges 55 are provided to rise up from the front and rear sides and the outer edge in the left and right directions of the side seedling-carrying tray 50 .

[0043] The seedling tray flange members rising from the front and rear sides and the outer edges in the left and right directions of the side seedling tray 50 are attached by knob bolt fastening or the like and can be removed individually.

[0044] A chute flange 65 is provided to rise from the rear and left and right edge portions of the chute 60 .

[0045] Shooter flange members rising from the rear and left and right edges of the chute 60 are attached by knob bolt fastenings or the like and are individually removable.

[0046] When the side seedling carrying platform 50 and the shooter 60 are rotated upward, a space S is formed between the seedling carrying platform flange 55 rising from the rear edge and the shooter flanges 65 rising from the left and right edges so that interference between the side seedling carrying platform 50 and the shooter 60 does not occur.

[0047] Although the size of the space S is not necessarily large, seedlings can sometimes become trapped in the space S when the space S is intact and not hidden.

[0048] When the side seedling-placing tables 50 and the shooter 60 are not rotated upward, a space-hiding plate member 41 is erected upward on the rear edge of the center seedling-placing table 40 so that the space S is hidden.

[0049] As shown in FIG. 3(c), the space concealing plate member 41 can conceal the space S even when the seedling carrying platform flange members rising from the front and rear edges of the side seedling carrying platform 50 are removed and then reattached to the outer end of the center seedling carrying platform 40.

[0050] As shown in Fig. 5(c), the shooter 60 is removable. This improves versatility because it does not get in the way of a worker who wants to plant seedlings from so-called cell tray seedlings. After being removed, the seedling-carrying platform flange members rising from the rear edges of the left and right side seedling-carrying platforms 50 and the space-hiding plate member 41 can be reattached with the vertical orientation reversed, allowing the user to use the seedling-carrying platform in a simple configuration without the shooter 60 according to their preferences.

[0051] Two frame members 30 erected on the bumper member 11 on the front side of the vehicle body 10 support a center seedling loading table 40 from below at the upper ends of the two frame members.

[0052] As shown in Fig. 4(d), the front side of the center seedling table 40 is connected to the bumper member 11 by a substantially V-shaped frame mechanism using two frame members 30. The frame longitudinal direction of the frame members 30 is in an oblique direction, and the frame members 30 exert supporting force not only in the vertical direction but also in the horizontal direction, improving the strength of the seedling table. Furthermore, by stably placing seedling containers 103, etc. on the front side of the center seedling table 40, seedlings can be easily supplied to the center seedling table 40, etc.

[0053] As shown in Fig. 5(a), the frame member 30 is bent into a substantially L-shape in side view, and the upper part of the frame member 30 forms a horizontal part located in front of the center seedling stand 40 on which the seedling container 103 and the like can be placed, so that seedlings can be easily supplied from the seedling container 103 to the center seedling stand 40. The frame member 30 is attached to the center seedling stand 40, and a plurality of pin holes are formed into which pins for selecting the frame member attachment position can be inserted, and the seedling stand inclination angle of the center seedling stand 40 is adjustable. By adjusting the seedling stand inclination angle so that the center seedling stand 40 is inclined backward, seedlings such as seed potatoes can smoothly fall from the center seedling stand 40 to the shooter 60.

[0054] A bridging reinforcement plate 31 is attached between the two frame members 30 .

[0055] As shown in Fig. 5(b), the bridge reinforcing plate 31 can function as a platform for the seedling container 103 when the remaining seedlings are discharged from the center seedling platform 40 to the seedling container 103, and can also function as a platform for the fuel tank when fuel is supplied from the fuel tank, thereby reducing the number of parts and simplifying the structure. The seedling platform flange member rising from the front edge of the center seedling platform 40 is attached by knob bolt fastening or the like and is removable, so that the remaining seedlings can be easily discharged from the center seedling platform 40 to the seedling container 103, and the seedling platform flange member thus removed can also be used as a seedling discharge rake.

[0056] The vehicle height adjustment mechanism 20 is a mechanism for adjusting the height of the rear side of the vehicle body 10.

[0057] Although it is possible to adjust the height of the front side of the vehicle body 10 in conjunction with the height of the rear side of the vehicle body 10, the inclination state of the bridge reinforcement plate 31 can be changed by adjusting the height of only the rear side of the vehicle body 10 while maintaining the height of the front side of the vehicle body 10.

[0058] When the height of the rear side of the vehicle body 10 is adjusted to be maximum, the inclination state of the bridge reinforcing plate 31 becomes horizontal.

[0059] When the rear height of the vehicle body 10 is adjusted to its maximum and the vehicle is turning, the seedling container 103 is less likely to tilt, and when the rear height of the vehicle body 10 is adjusted to its smaller height again and the vehicle is planting, the seedling container 103 tilts backward to facilitate seedling supply, which often improves work efficiency.

[0060] As shown in Figure 4 (c), the size of the bottom plate of the seedling carrying platform frame bottom plate 102 of the side seedling carrying platform 50 when viewed from above is slightly smaller than the outer frame size of the side seedling carrying platform 50, so that a small gap is formed at the rear of the side seedling carrying platform 50, allowing broken sprouts of seedlings such as seed potatoes and mud to fall smoothly into the field.

[0061] (2) Next, the configuration and operation of the vegetable transplanter according to the embodiment of the present invention will be described in more detail.

[0062] (2A) A specific description will be given of an aspect relating to the configuration of the potato seedling frame angle adjustment bumper plate.

[0063] As shown in FIG. 6, which is an explanatory diagram (part 1) of the potato seedling frame angle adjustment bumper plate configuration of the vegetable transplanter according to the embodiment of the present invention, two or more plates 201 with multiple holes are extended upward from both ends of the bumper member 11, two or more frame members 30 are extended in parallel from the seedling frame, and mounting holes parallel to the plates 201 are provided, and the holes of the frame members 30 are fixed so that they pass through the inside of the plates 201. This can meet the demand for adjusting the angle of the seedling frame. The angle of the seedling frame can be adjusted. Since the frame members 30 pass between the plates 201 in parallel, the plates 201 serve as a guide for the track of the frame members 30. Since the tip is supported, it is advantageous in terms of moment. Since the angle is adjusted at the front of the vehicle body 10, the operation is simple. Since the frame member 30 passes inside the plate 201 and the bumper member 11 is provided between the plates 201, even if the hand slips and the frame member 30 is dropped, it is stopped by the bumper member 11, and there is no danger of a person being caught between the plate 201 and the frame member 30.

[0064] As shown in FIG. 7, which is an explanatory diagram (part 2) of the potato seedling frame angle adjustment bumper plate configuration of the vegetable transplanter according to the embodiment of the present invention, in comparison with the above-mentioned embodiment, a configuration in which the frame members 30 are connected to each other by a bar 202 near the tip of the frame members 30 is conceivable. This can meet the demand for adjusting the angle of the seedling frame. Since the frame members 30 are connected, it is expected that the strength will be increased. Since the bar 202 is inserted and the frame members 30 are sandwiched by the plate 201, in comparison with the above-mentioned embodiment, the plate 201 acts as a guide and the track is less likely to deviate. Since the angle can be adjusted by holding the bar 202, the angle can be adjusted by holding the vicinity of the mounting holes, making adjustment easy.

[0065] As shown in Fig. 8(a) to 8(c), which are explanatory diagrams (parts 3 to 5) of the potato seedling frame angle adjustment bumper plate configuration of the vegetable transplanter according to the embodiment of the present invention, in comparison with the above-mentioned embodiment, a hook is provided on the plate 201, the tip of the frame member 30 is connected with the bar 202, and the bar 202 is fitted into a groove at any position of the plate 201. This can meet the demand for adjusting the angle of the seedling frame. In comparison with the above-mentioned embodiment, when the seedling frame is lifted, the bar 202 moves backward and is removed from the groove, so that the angle of the seedling frame can be easily lowered and potatoes can be easily inserted. Since the tip of the frame member 30 is connected, it is expected that the strength will be increased. The angle of the seedling frame can be adjusted with one touch. Force is always applied to the plate 201, so the bar 202 is unlikely to come off unintentionally.

[0066] As shown in Fig. 9(a) to 9(c), which are explanatory diagrams (parts 6 to 8) of the potato seedling frame angle adjustment bumper plate configuration of the vegetable transplanter according to the embodiment of the present invention, in comparison with the above-mentioned embodiment, a configuration is conceivable in which a hook portion is provided on the plate 201 so that the hooking direction is reversed, and the bar 202 is fitted into a groove at an arbitrary location of the plate 201. In comparison with the above-mentioned embodiment, when the bar 202 and the seedling frame are lifted and fixed, a force is applied to the bar 202 and the seedling frame in the same direction, so that they can be easily fixed, and there is no need to adjust the position of the bar 202 while supporting the seedling frame, and the bar 202 faces the direction of the vehicle body 10 by lifting the seedling frame, so that the bar 202 can be easily inserted into the groove.

[0067] (2B) A specific description will be given of aspects relating to the potato seedling frame support configuration.

[0068] As shown in FIG. 10, which is an explanatory diagram (part 1) of the potato seedling frame support configuration of a vegetable transplanter according to an embodiment of the present invention, a configuration is conceivable in which a frame member 30 is extended from near the mounting hole at the bottom of the bumper member 11 to support the front of the seedling frame. This makes it difficult for a large weight to be directly applied to the seedling frame. This is advantageous in terms of moment, and is expected to increase strength. It is easy to adjust the angle of the seedling frame because it is right in front of you. It does not get in the way when potatoes are inserted from the side or back. When inserting potatoes from the front, the seedling container 103 can be temporarily placed on the frame member 30. It serves as a protective member in case the seedling frame falls. It is advantageous in terms of vehicle balance because the front is heavier. It is easy to insert and remove pins or bolts, so the angle can be easily adjusted.

[0069] As shown in Fig. 11(a) and 11(b), which are explanatory diagrams (parts 2 and 3) of the potato seedling frame support configuration of a vegetable transplanter according to an embodiment of the present invention, in comparison with the above-mentioned embodiment, a configuration in which a frame member 30 extended from the bumper member 11 has multiple holes on the rotation line of the seedling frame to support the center seedling loading platform 40 is conceivable. If the holes are not provided on the rotation line, installation may be difficult, but since the trajectory is known, installation is easy. Both ends of the frame member 30 can be fixed, so there is no need to loosen the screws when adjusting the angle.

[0070] As shown in Figs. 12(a) and 12(b), which are explanatory diagrams (parts 4 and 5) of the potato seedling frame support configuration of the vegetable transplanter according to the embodiment of the present invention, in comparison with the above-mentioned embodiment, a configuration in which two frame members 30 cut diagonally are connected by members such as two or more bridging reinforcement plates 31 is conceivable. The seedling frame can be heavy, but since two frame members 30 are connected, it is expected that the strength will be increased. It is stable even when a seedling container 103 is placed. When potatoes are discharged from the front, the seedling container 103 can be placed, making it easy to put in the potatoes, and the seedling container 103 can be placed to put the potatoes in.

[0071] As shown in Figs. 13(a) and 13(b), which are explanatory diagrams (parts 6 and 7) of the potato seedling frame support configuration of the vegetable transplanter according to the embodiment of the present invention, in comparison with the above-mentioned embodiment, a configuration in which a member such as the bridging reinforcing plate 31 is extended forward from the lower side and cut up upward is conceivable. Since the five sides around the seedling container 103 are supported, the seedling container 103 is stabilized. Since the front of the bottom surface is extended, it is easy to load the seedling container 103 from the front. Work can be done with the seedling container 103 loaded. Since work can be done with the seedling container 103 loaded, it is advantageous in terms of weight balance.

[0072] As shown in Fig. 14(a) and 14(b), which are explanatory diagrams (parts 8 and 9) of the potato seedling frame support configuration of the vegetable transplanter according to the embodiment of the present invention, in comparison with the above-mentioned embodiment, a configuration in which a member such as a bridging reinforcing plate 31 is extended from the frame member 30 to provide a frame is conceivable. In comparison with the above-mentioned embodiment, an effect of further improving stability is expected.

[0073] As shown in Fig. 15(a) and 15(b), which are explanatory diagrams (parts 10 and 11) of the potato seedling frame support configuration of the vegetable transplanter according to the embodiment of the present invention, in comparison with the above-mentioned embodiment, a configuration in which a member such as the bridging reinforcement plate 31 is extended forward from the lower part of the member and not cut up, and no member is extended in front of the seedling container 103, is conceivable. The frame member 30 extended from the bumper member 11 may not be necessarily strong, but the seedling container 103 can be placed on it only when the vehicle body 10 is stopped and not moving, and the seedling container 103 slides down during the operation in which the vehicle body 10 is moved by the vertical lifting motion, so it is almost never placed in front of the seedling frame, improving safety.

[0074] As shown in Figures 16(a) and 16(b), which are explanatory diagrams (parts 12 and 13) of the potato seedling frame support configuration of the vegetable transplanter according to the embodiment of the present invention, in comparison with the above-mentioned embodiment, a configuration in which a vertical surface such as a bridging reinforcing plate 31 perpendicular to the frame member 30 is provided in front of the frame member 30 is conceivable. Although the frame member 30 extending from the bumper member 11 may not necessarily be strong, in comparison with the above-mentioned embodiment, it is easier to place the seedling container 103, the seedling container 103 is more stable when the plant is stopped, and it is easier for the operator to lower the seedling frames during operation.

[0075] As shown in Figures 17(a) and 17(b), which are explanatory diagrams (parts 14 and 15) of the potato seedling frame support configuration of the vegetable transplanter according to the embodiment of the present invention, in comparison with the above-mentioned embodiment, a configuration in which a surface such as a bridging reinforcement plate 31 that is parallel to the ground when the body 10 is raised is arranged in front of the frame member 30 is conceivable. When the body 10 is raised, it may be difficult to put in potatoes, but in comparison with the above-mentioned embodiment, it is easier to put in potatoes when the body 10 is raised, so the potatoes flow backward, and when the body 10 is lowered, the seedling container 103 naturally descends.

[0076] As shown in Figures 18(a) and 18(b), which are explanatory diagrams (Nos. 16 and 17) of the potato seedling frame support configuration of the vegetable transplanter according to the embodiment of the present invention, in comparison with the above-described embodiment, a configuration in which a surface such as a bridging reinforcement plate 31 that is parallel to the ground when the vehicle body 10 descends is arranged in front of the frame member 30 is conceivable. In comparison with the above-described embodiment, it is easier to insert potatoes when the vehicle body 10 descends, and the seedling container 103 slides down before the vehicle body 10 enters the ridge, so work can be started smoothly.

[0077] As shown in Fig. 19(a) and 19(b), which are explanatory diagrams (parts 18 and 19) of the potato seedling frame support configuration of the vegetable transplanter according to the embodiment of the present invention, in comparison with the above-mentioned embodiment, a configuration in which the frame members 30 are connected by members such as a bar 202 provided below is conceivable. In comparison with the above-mentioned embodiment, the strength is improved and the seedling container 103 is stabilized.

[0078] As shown in Figures 20(a) and 20(b), which are explanatory diagrams (parts 20 and 21) of the potato seedling frame support configuration of the vegetable transplanter according to the embodiment of the present invention, in comparison with the above-mentioned embodiment, a configuration is conceivable in which the frame members 30 are connected by members such as two bars 202, a seedling container stand 301 is provided in front of such members as a dedicated unit for placing the seedling container 103, and the upper surface of the seedling container 103 is provided below the seedling frame. In comparison with the above-mentioned embodiment, it is easier to put potatoes into the seedling container 103, and the seedling container 103 can be placed horizontally on the seedling container stand 301, so that the seedling container 103 is stable.

[0079] (3) Next, the configuration and operation of the vegetable transplanter according to the embodiment of the present invention will be described in more detail.

[0080] (3A) An embodiment relating to the potato seedling frame angle adjustment configuration will be specifically described.

[0081] As shown in Fig. 21, which is an explanatory diagram (part 1) of the potato seedling frame angle adjustment configuration of the vegetable transplanter according to the embodiment of the present invention, the rear end of the angle adjustment frame 401 extending from the bumper member 11 is fixed by the hole shaft of the sub-transmission case, an angle adjustment rail 402 parallel to the angle adjustment frame 401 is provided at the bottom of the seedling frame, and an eyelet member like a ring through which the angle adjustment frame 401 and the angle adjustment rail 402 pass is attached to both ends of the bar, and the angle adjustment frame 401 is connected to the angle adjustment rail 402 by a link bar 403 longer than the distance between the angle adjustment frame 401 and the angle adjustment rail 402. Such a mechanism provided in the center of the vehicle body or provided in a set in line in the left-right direction of the vehicle body can meet the demand for adjusting the angle of the seedling frame. Since the seedling frame angle can be adjusted only by changing the position of the link bar 403 in the front-rear direction of the vehicle body, the seedling frame angle can be easily changed when putting potatoes in.

[0082] As shown in Figures 22(a) and 22(b), which are explanatory diagrams (parts 2 and 3) of the potato seedling frame angle adjustment configuration of the vegetable transplanter according to the embodiment of the present invention, in comparison with the above-mentioned embodiment, a configuration is conceivable in which a bar in the left-right direction of the vehicle body that fits into the notch is adopted instead of the upper eyelet member described above, and a notch plate 404 having jagged notches is attached to the seedling frame side above the angle adjustment frame 401. Since taro seedlings and the like are quite heavy and tend to be difficult to transport, such a configuration using a notch plate 404, which is easier to adjust the angle in comparison with the above-mentioned embodiment, is often desirable.

[0083] As shown in Fig. 23, which is an explanatory diagram (part 4) of the potato seedling frame angle adjustment configuration of the vegetable transplanter according to the embodiment of the present invention, in comparison with the above-mentioned embodiment, a configuration in which multiple parallel notch plates 404 are arranged in the left-right direction of the vehicle body is conceivable. Compared with the above-mentioned embodiment, the stability in the left-right direction of the vehicle body is improved, and an increase in strength is expected.

[0084] (3B) The configuration of the potato seedling discharge port opening and closing unit will be specifically described.

[0085] As shown in Figs. 24(a) to 24(d), which are explanatory diagrams (parts 1 to 4) of the potato seedling discharge port opening and closing unit configuration of the vegetable transplanter according to the embodiment of the present invention, a hinge 502 is provided on the seedling frame side plate 501 on the front side of the vehicle body 10, and a lock part 503 is provided on the seedling frame side plate 501 on the side where the hinge 502 is not provided. When the remaining potatoes are discharged after the work, the seedling frame side plate 501 is rotated to the inside of the seedling frame so as not to get in the way, and the view in front of the vehicle body 10 is not blocked, so the worker does not need to change his / her standing position in the left and right directions of the vehicle body. The potatoes can be put in and taken out more easily. For example, when discharging the potatoes, the opening and closing part of the seedling frame side plate 501 acts as a guide to form a flow of potatoes, and the potatoes are easily discharged, so the worker can work comfortably while standing on one side of the vehicle body 10.

[0086] As shown in Figures 25(a) and 25(b), which are explanatory diagrams (parts 5 and 6) of the configuration of the potato seedling discharge port opening and closing unit of the vegetable transplanter according to the embodiment of the present invention, in comparison with the above-mentioned embodiment, a configuration in which hinges 502 are provided on both the left and right sides of the seedling frame side plate 501 on the front side of the body 10 and a lock part 503 is provided on the upper part of one of the seedling frame side plates 501 is considered. In comparison with the above-mentioned embodiment, the opening and closing part of the seedling frame side plate 501 is configured as a double-opening configuration, which improves seedling guiding properties when discharging seedlings into the seedling container 103.

[0087] (3C) Aspects relating to the motorized configuration of the vegetable transplanter will be specifically described.

[0088] As shown in Fig. 26(a) to 26(c), which are explanatory diagrams (parts 1 to 3) of the motorized configuration of the vegetable transplanter according to the embodiment of the present invention, a configuration is considered in which the traveling motor 601 driven by the battery 603 controls the rotation at a variable speed to keep the vehicle speed set by the operator. In providing a fully automatic vegetable transplanter that makes the most of the benefits of motorization, the work efficiency of the vehicle body 10 is improved.

[0089] The planting motor 602 driven by the battery 603 can be configured to rotate once and control the stop time according to the set spacing between plants. In providing a fully automatic vegetable transplanter that takes advantage of the benefits of motorization, an improvement in the spacing control mechanism can be realized.

[0090] The spacing control can be configured to control the timing of one rotation of the planting motor 602 based on the rotation speed of the travel motor 601 and the rotation distance of the roller sensor 604 according to the set spacing. In providing a fully automatic vegetable transplanter that takes advantage of the benefits of electrification, an improvement in the spacing correction mechanism has been realized.

[0091] In comparison with the above-mentioned embodiment, a configuration is conceivable in which the rotation distance of the roller sensor 604 is the main criterion for the spacing control, and if the specified distance is not recognized, the rotation speed of the travel motor 601 takes priority. In providing a fully automatic vegetable transplanter that takes advantage of the benefits of electrification, an improvement in the spacing correction mechanism is realized.

[0092] A protrusion can be provided in the center of the roller of the roller sensor 604 to prevent slippage by rolling resistance. In providing a fully automatic vegetable transplanter that takes advantage of the benefits of motorization, an improvement in the plant spacing correction mechanism can be realized.

[0093] As shown in Fig. 27(a) to 27(c), which are explanatory diagrams (parts 4 to 6) of the motorized configuration of the vegetable transplanter according to the embodiment of the present invention, a knurled shape may be provided on the roller surface of the roller sensor 604 to prevent slippage due to rolling resistance. In providing a fully automatic vegetable transplanter that takes advantage of the benefits of motorization, an improvement in the plant spacing correction mechanism is realized.

[0094] The height of the vehicle body 10 may be controlled by electric cylinders provided on the left and right sides. In providing a fully automatic vegetable transplanter that takes advantage of the benefits of electrification, an improvement in the vehicle body attitude control mechanism is realized.

[0095] The left and right tilt control can be achieved by controlling the left and right electric cylinders with the tilt sensor 605 installed in the center of the vehicle. In providing a fully automatic vegetable transplanter that takes advantage of the benefits of electrification, the vehicle attitude control mechanism has been improved.

[0096] It is possible to consider a configuration in which the vehicle body inclination control can be performed by arbitrarily changing the reference of the inclination sensor 605 through the furrow surface horizontal control. In providing a fully automatic vegetable transplanter that takes advantage of the benefits of electrification, an improvement in the vehicle body attitude control mechanism can be realized.

[0097] A configuration for protecting the planting section can be considered by providing a safety clutch 606 on the operating link of the hole opener. In providing a fully automatic vegetable transplanter that takes advantage of the benefits of motorization, an improvement in the operating mechanism of the planting section can be realized.

[0098] It is possible to provide a clutch mechanism in the safety clutch 606, and to provide a clutch mechanism in the operating link of the hole opener so that it can be stopped independently. In providing a fully automatic vegetable transplanter that takes advantage of the benefits of electrification, an improvement in the operating mechanism of the planting part is realized.

[0099] A configuration in which a missing plant detection sensor 607 is provided in the extraction claw section is conceivable. In providing a fully automatic vegetable transplanter that takes advantage of the benefits of electrification, an improvement in the operating mechanism of the planting section is realized.

[0100] When the removal claw detects a missing plant in the cell tray, the removal claw and seedling tank are operated continuously, and the operating link of the hole opener is stopped.In providing a fully automatic vegetable transplanter that takes advantage of the benefits of motorization, an improvement in the operating mechanism of the planting section is realized.

[0101] (3D) An embodiment relating to the control configuration of the fully automatic vegetable transplanter is specifically described.

[0102] In a fully automatic vegetable transplanter, (1) an optical fiber is installed within a structural component of the body 10, and a measurement sensor capable of measuring the transmission wavelength between the components is installed, (2) bending losses are detected using multiple optical fibers within each component of the body 10 and a measurement sensor that measures wavelengths, making it possible to measure distortion of the structure of the body 10, and (3) an onboard ECU can analyze detection data from such measurement sensors at regular intervals and store it as comparable data, enabling automatic control.

[0103] In the above-described aspect, a configuration may be considered in which data detected during operation is recorded and compared every time a certain period of operation has elapsed since shipment, enabling self-diagnosis through control that detects changes from the beginning of operation.

[0104] In the above-mentioned embodiment, the drive data at regular intervals is compared to measure the response delay between the drive command output from the mounted ECU and the operation of the drive parts, and when the distortion of the vehicle body structure increases with age, the case where the delay in the operation response also increases is judged to be due to wear of the vehicle body 10, and a control is performed to estimate the operating time until a breakdown.Fault determination can be performed by self-diagnosis.

[0105] In the above-mentioned aspect, when a fault is determined by self-diagnosis, a configuration can be considered that enables the operator to be notified of a control fault state by using the on-board seedling out buzzer and the LCD display attached to the on-board ECU to individually display the detected fault location.

[0106] In the above-mentioned aspect, a configuration can be considered in which when a fault is determined by self-diagnosis, a solenoid output is forcibly generated from the onboard controller, thereby enabling the vehicle to operate as an emergency measure in the event of a control failure, thereby achieving minimum field work. [Industrial Applicability]

[0107] The work vehicle of the present invention can improve usability and is useful for use as a work vehicle such as a vegetable transplanter. [Explanation of symbols]

[0108] 10. Body 11 Bumper parts 20 Height adjustment mechanism 30 Frame members 31 Bridge reinforcement plate 40 Center seedling stand 41 Space concealing plate component 50 Side seedling tray 51 Gap closing plate member 55 Seedling stand flange 59 Seedling platform rotating shaft 60 Shooter 65 Shooter flange 69 Shooter pivot axis 70 Connecting plate member 71 Pin hole 72 Convex 80 pin 101 Seedling cup device 102 Seedling stand frame bottom plate 103 Seedling Container 201 Plate 202 Bar 301 Seedling container stand 401 Angle adjustment frame 402 Angle adjustment rail 403 Link Bar 404 Notch Plate 501 Seedling frame side plate 502 Hinge 503 Rock Club 601 Driving motor 602 Planting motor 603 Battery 604 Roller Sensor 605 Tilt Sensor 606 Safety Clutch 607 Missing Stock Sensor P1 Pin contact position P2 Protruding part contact position S Space

Claims

1. A center seedling stand attached to the center in the left-right direction; Left and right side seedling racks are attached to the left and right sides of the center seedling rack, respectively, and are rotatable around a seedling rack rotation axis in the front-rear direction; It is equipped with A generally U-shaped connecting plate member is provided for connecting the side seedling tray to the center seedling tray, One end of the connecting plate member is rotatably connected to the outer end of the center seedling tray located on the side seedling tray side, The other end of the connecting plate member is fixed to the inner end of the side seedling tray located on the center seedling tray side, A work vehicle characterized in that a gap closing plate member is erected downwardly on the innermost edge of the inner end of the side seedling loading platform so that a gap does not occur between the innermost edge of the side seedling loading platform and the center seedling loading platform when the side seedling loading platform is rotated upward.

2. A plurality of pin holes into which pins for selecting the rotation angle of the side seedling tray can be inserted are formed in the connecting plate member at positions near the seedling tray rotation axis; The pins inserted into the pin holes come into contact with the pin contact positions on the underside of the center seedling tray, thereby preventing the side seedling tray from rotating downward.

2. The work vehicle according to claim 1, wherein the pin abutment position is an inner position of the seedling tray pivot shaft in the left-right direction.

3. The convex portion of the connecting plate member abuts against the convex portion abutment position on the lower surface of the center seedling-loading table, thereby preventing the side seedling-loading table from rotating upward.

3. The work vehicle according to claim 2, wherein the protruding portion abutment position is an outer position of the seedling-mounting-table pivot shaft in the left-right direction.

4. The center seedling tray is provided with a chute attached to the rear side thereof, the chute being rotatable about the left-right chute rotation axis, The seedling tray flange is provided so as to rise from the front and rear sides of the side seedling tray and from the outer edge in the left-right direction, A chute flange is provided so as to rise from the rear side and the left and right edges of the chute, When the side seedling tray and the chute are rotated upward, a space is formed between the seedling tray flange rising from the rear edge and the chute flange rising from the left and right edges so that interference between the side seedling tray and the chute does not occur; A work vehicle as described in claim 3, characterized in that a space concealing plate member is erected upward on the rear edge of the center seedling loading table so that the space is hidden when the side seedling loading table and the shooter are not rotated upward.

5. Two frame members erected on the bumper member at the front of the vehicle body support the center seedling tray from below at the upper ends of the two frame members, 5. A work vehicle according to claim 4, wherein a bridge reinforcement plate is attached between said two frame members.

6. A vehicle height adjustment mechanism is provided for adjusting the height of the rear side of the vehicle body, 6. The work vehicle according to claim 5, wherein when the height of the rear side of the vehicle body is adjusted to a maximum, the inclination state of the bridge reinforcement plate becomes horizontal.

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