JP2001213368A - Front wheel mounting structure for traveling body - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To ensure the straightness of a walking type transplanter. SOLUTION: In a transplanter having a pair of left and right front wheels 6 and a pair of right and left rear wheels 7, a mounting angle of a front axle 23 for rotatably supporting the front wheel 6 with respect to a left and right direction can be changed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for mounting a front wheel of a traveling body.

[0002]

2. Description of the Related Art Conventionally, for example, in a walking type transplanter,
A traveling body having a pair of left and right front wheels and a pair of left and right rear wheels is provided, and a transplanting device is provided at a rear portion of the traveling body so that seedlings are automatically planted in the ridge while traveling along the ridge. There are those that have been configured.

[0003]

In the transplanting machine, the traveling body is caused to travel straight due to the accuracy of the frame at the time of assembling the body, the twisting of the chain case for transmitting power to the rear wheels, and the weight balance of the body. May not be possible.
In addition, even when the water tank of the watering device is optionally installed, the weight balance is deteriorated, and the traveling body may not be able to travel straight. In view of the above problems, an object of the present invention is to provide a traveling body that aims to ensure straightness.

[0004]

The technical means taken by the present invention to achieve the above object is that a front body is rotatably supported on a traveling body having a pair of left and right front wheels and a pair of left and right rear wheels. The mounting angle of the front axle with respect to the left-right direction can be freely changed. Further, in a traveling body including a pair of left and right front wheels and a pair of left and right rear wheels, a front axle that rotatably supports the front wheels, a state in which a mounting angle with respect to a left and right direction can be changed back and forth, It is characterized in that the mounting angle with respect to the left and right direction can be changed up and down.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 show a walking type transplanter. This transplanter is mainly composed of a traveling body 1 and a transplanting device 2 provided on the traveling body 1. The traveling body 1 has a body 3, and an engine (not shown), a transmission case 4, and the like are attached to the body 3, and the engine and the transmission case 4 are covered with a hood 5.
The body 3 is supported so as to be able to travel by a pair of left and right front wheels 6 and a pair of left and right rear wheels 7.

A main frame 8 extending rearward from the transmission case 4 is fixed to an upper portion of a rear portion of the transmission case 4.
An implanting frame 10 extending rearward from the transmission case 4 is fixed, and the main frame 8 and the implanting frame 10 are provided with the transplanting device 2. A handle 9 is attached to the rear end of the main frame 8. A front wheel support shaft 11 and a rear wheel support shaft 12 are provided on both left and right sides of the body 3 so as to protrude outward in the left and right direction, respectively. The left and right rear wheel support shafts 12
Are also independently rotatable about a left-right axis.

As shown in FIGS. 2 and 3, the front wheel support shaft 11 includes a cylindrical base shaft 13 rotatably supported by a front wheel support 3a of the body 3 around a left-right axis. The inner side in the left-right direction comprises an outer shaft 14 which is fitted inside the base shaft 13 from the outside in the left-right direction so as to be freely detachable, and which is fixed by a bolt 15 or the like so that it cannot be removed. The base shaft 13 is formed in a square cylindrical shape, and the outer shaft 14 is formed in the shape of a quadrangular prism similar to the base shaft 13, and the outer shaft 14 cannot rotate relative to the base shaft 13 (can be integrally rotated). Have been.

A mounting cylinder 18 is externally fixed to the outer side of the outer shaft 14 in the left-right direction. The mounting cylinder 18 is formed of a square cylindrical body similar to the outer shaft 14, and the mounting cylinder 18 is relatively movable in the left-right direction with respect to the outer shaft 14 and is integrally rotatable. Further, the mounting cylinder 18 is fixed to the outer shaft 14 by a pin 19 or the like penetrating the mounting cylinder 18 and the outer shaft 14, and a plurality of insertion holes for the pins 19 formed in the outer shaft 14 are provided in the left-right direction. The mounting tube 18 is formed
The position of the front wheel 6 (ie, the front wheel 6) in the left-right direction is adjustable.

A front wheel arm 22 is fixed to the mounting cylinder 18 so as to protrude obliquely rearward and downward and extend and contract in the longitudinal direction. The front axle 23 is attached, and the front wheel 6 is rotatably attached to the front axle 23 around the axis of the front axle 23. The front wheel arm 22 has a cylindrical body 22a whose upper end side is fixed to the mounting cylinder 18 by welding or the like,
A movable rod 22b inserted into the cylindrical body 22a from the lower end side so as to be movable in the axial direction.
Is fixed by bolts or the like penetrating the moving rod 22b and the cylindrical body 22a.

[0010] A plurality of bolt insertion holes are formed in the cylindrical body 22a and the moving rod 22b, so that the length of the front wheel arm 22 can be adjusted. As shown in FIG. 3 to FIG. 6, the front wheel arm 22 is inclined at an angle of 45 ° with respect to the vertical direction and moves downward as it goes rearward. The mounting device 1
Reference numeral 6 denotes a base member 28 fixed on the inner side in the left-right direction of the moving rod 22b, a pair of upper and lower support members 29 fixed on the inner surface side in the left-right direction of the base member 28, and penetrates the upper and lower support members 29. A shaft 30 having a vertical axis and a cylindrical shaft 31 disposed between the upper and lower support members 29 and fitted around the shaft 30 so as to be rotatable around the axis.
And a pair of front and rear adjustment bolts 32.

A front axle 23 is fixed to the cylinder shaft 31 so as to protrude inward in the left-right direction and in a direction perpendicular to the axis of the cylinder shaft 31, whereby the front axle 23 and the front wheel 6 are fixed. Are rotatably mounted around a vertical rotation axis X (the axis of the support shaft 30 and the cylindrical shaft 31). A pair of front and rear mounting pieces 33 are fixed to the cylindrical shaft 31, and each mounting piece 3
3, a screw hole 35 is formed in the left and right direction so as to penetrate therethrough. The adjustment bolt 32 is screwed into the screw hole 35 from outside in the left and right direction. , The front axle 23 and the front wheel 6
About the rotation axis X is regulated.

A lock nut 36 for preventing loosening is screwed into the adjusting bolt 32 from the front end side. In the front wheel mounting structure having the above-described configuration, one of the front and rear adjustment bolts 32 is screwed in and the other is screwed out, so that the front axle 23 (front wheel 6) can be mounted in the left-right direction C (right and left). The angle formed between the direction A and the axis of the front axle 23 can be changed back and forth (adjustable). Then, as shown in FIG. 7, by adjusting the mounting angle of the left and right front axles 23 with the adjustment bolts 32 so that the front axle 23 is inclined so as to shift rearward as it goes inward in the left-right direction, The front wheels 6 are directed in an inclining direction that shifts inward in the left-right direction as they move forward, so that the straightness of the traveling body 1 can be ensured.

In the front wheel mounting structure having the above-described structure, the outer shaft 14 of the front wheel support shaft 11 of the left front wheel 6 shown in FIG.
Is disengaged from the base shaft 13, and the outer shaft 14 is disposed on the right side of the traveling body 1 by inverting (turning over) the left and right sides as shown by phantom lines in FIG. Outer shaft 1
8, the outer shaft 14 is inserted into the base shaft 13 of the right front wheel support shaft 11 by rotating the outer shaft 14 backward (in the direction indicated by the arrow D) by 90 ° around the left and right axes as shown by the solid line in FIG. And fix it. Then, the axis of the support shaft 30 coincides with the front-rear direction, and this time, the front axle 23 and the front wheel 6 can rotate around the rotation axis X in the front-rear direction, and the front axle 23 (the front wheel 6) The mounting angle with respect to the left and right direction can be changed up and down (adjustable)
Becomes

The right front wheel 6 is similarly replaced. Then, as shown in FIG. 9, by adjusting the mounting angles of the left and right front axles 23 with the adjustment bolts 32 so that the front axle 23 is inclined so as to move upward as it goes inward in the left and right direction, The left and right front wheels 6 are oriented in such a manner that the ridges R are sandwiched by the left and right front wheels 6 in an inclined direction that shifts outward in the left-right direction as the front wheels 6 move upward, whereby the traveling performance of the traveling body 1 can be ensured. I have. Therefore, by changing the outer shaft 14 right and left together with the front wheel arm 22 and the front wheel 6 and the like, the mounting angle of the front axle 23 rotatably supporting the front wheel 6 in the left-right direction C can be changed back and forth. The mounting angle of the axle 23 with respect to the left-right direction can be changed to a state in which it can be changed up and down.

When the covering M of the multi-film covering the ridge R is hard, the left and right front wheels 6 are inclined so as to move outward in the left-right direction as going upward, and the covering M of the multi-film is soft. It is preferable that the right and left front wheels 6 are inclined so as to move inward in the left-right direction as they move forward. The base shaft 13 includes a bracket 2
0 is projected upward, and the link 20
1 has a front end pivotally supported. Further, a bearing 25 is provided on the base shaft 13 so as to be rotatable and immovable in the axial direction, and a front end portion of the connecting member 27 is fixed to the bearing 25.

The rear wheel support shaft 12 is mounted on the transmission case 4
A cylindrical inner shaft rotatably supported around the left-right axis, and a left-right inner side is fitted to the inner shaft so as to be integrally rotatable from the left-right outer side, and a right-left position is adjusted. It is composed of a freely movable outer shaft and is freely expandable and contractable in the left-right direction. A rear wheel arm 34 is fixed to the rear end of the rear wheel support shaft 12 in the left-right direction, and the rear wheel arm 34 is inclined downward and moves downward toward the rear. The rear wheel 7 is rotatably mounted via the.

The rear wheel arm 34 is formed as a transmission case, and the power from the transmission case 4 is transmitted to the rear axle 24 via the transmission shaft in the rear wheel support shaft 12 and the power transmission mechanism in the rear wheel arm 34. , The rear wheel 7 is configured to be driven to rotate. A bearing 42 is provided on the outer peripheral portion of the rear wheel support shaft 12.
Are provided so as to be relatively rotatable and immovable in the axial direction, and the rear end of the connecting member 27 is fixed to the bearing 42. A bracket 44 projects upward from the outer peripheral surface of the rear wheel support shaft 12, and the bracket 44 is attached to the interlocking link 2.
1 has a rear end pivotally supported.

Thus, the rear wheel support shaft 12 and the front wheel support shaft 11 rotate in conjunction with each other by the interlocking link 21. A turnbuckle is interposed in the middle of this interlocking link 21,
The length of the interlocking link 21 is adjustable. The body 3 is provided with a lifting cylinder 47 composed of a hydraulic cylinder, and a piston rod of the cylinder 47 is movable in the front-rear direction. An elevating shaft 48 having a left-right axis is attached to the piston rod, and the elevating shaft 48 is rotatably and longitudinally supported by the body 3 by a slide bearing 49. .

Arms 50R and 50L projecting upward and downward from each other are fixed to left and right ends of the elevating shaft 48, respectively. The two arms 50R and 50L and the bracket 44 provided on the rear wheel support shaft 12 are provided with links 51R and 51L.
Are joined by Therefore, when the piston rod of the lifting cylinder 47 expands and contracts, the lifting shaft 48 moves in the front-rear direction, and the left and right rear wheel support shafts 12 move around the left-right axis through the links 51R and 51L. The left and right rear wheel arms 34 swing simultaneously by the same amount in the same vertical direction.

The rotation of the left and right rear wheel support shafts 12 is performed via the interlocking link 21 of the interlocking device.
The left and right front wheel support shafts 11 rotate by the same amount as the rear wheel support shaft 12, and the left and right front wheel arms 23 swing by the same amount in the same vertical direction. Thereby, the height of the right and left rear wheels 7 and the body 3 is adjusted, and the height of the left and right front wheels 6 and the body 3 is adjusted in the same direction by the same amount as the height of the rear wheels 7. The vehicle height can be adjusted according to the ridge height. A rolling cylinder 52 composed of a hydraulic cylinder is disposed in the body 3 in the front-rear direction, and a rolling arm 53 is protruded from the elevating shaft 48. The piston rod of the rolling cylinder 52 is connected to the rolling arm 53. When the piston rod expands and contracts in the front-rear direction, the elevating shaft 48 is rotated about its axis.

The rotation of the elevating shaft 48 causes the elevating shaft 4 to rotate.
8, the left and right arms 50R, 5 in opposite directions up and down at both ends.
0L pivots forward and the other pivots rearward, and the left and right links 51 connected to the left and right arms 50R and 50L.
The left and right rear wheel shafts 12 rotate in the opposite directions by the same amount, and the left and right rear wheel arms 34 swing in the opposite directions. I do. The rotation of the left and right rear wheel support shafts 12 is transmitted to the front wheel support shaft 11 via the interlocking link 21 of the interlocking device, and the left and right front wheel arms 23 also swing in opposite directions.

Since the left and right front and rear wheels 6, 7 move in opposite directions, the body 3 rolls left and right. Thus, when working on a slope, the aircraft body 3 is kept horizontal. The transplanting device 2 includes a plant 55 for planting seedlings in the ridges R, a seedling supply device 56 for supplying seedlings to the plant 55, and rolling on the upper surface of the ridge R located in front of the plant 55. A front roller 57 for leveling, and a pair of left and right rear rollers 58 located behind the planting body 55 and rolling on the upper side of the ridge R, and a hole for seedling planting in the multi-film covering the ridge R. And a perforating means.

The plant 55 is supported by the planting frame 10 via a swing link mechanism so as to be vertically swingable. This rocking link mechanism is driven by the power from the transmission case 4 so that the plant 55 moves in a vertically long elliptical locus, and seedlings are supplied at the upper end of the locus.
At the lower end of the trajectory, the planting body 55 protrudes into the ridge R. Further, the planting body 55 has an upper portion formed by a tubular body having an upper and lower opening shape, and has an opener that can be opened and closed back and forth at the lower portion. The opener is provided with a ridge R at the lower end side of the track of the planting body 55. When it enters, it opens back and forth by the interlocking tool, forms a transplant hole in the ridge R, and drops the seedling held inside the planting body 55 into the transplant hole so that the seedling can be planted.

The transplanter 1 is mainly used for transplanting tobacco seedlings.
In order for the seedling to be substantially immersed in the transplanting hole, the planting body 55 is larger than other vegetable transplanters, and the recoil when entering the ridge R is large. Therefore, the planting frame 10 that supports the planting body 55 is fixed to the traveling body 1 (in other vegetable transplanters, the planting frame 10 has its front end rotated around the left-right axis about the transmission case. It is pivotably mounted so that it can swing up and down.) Further, in transplanting tobacco seedlings, soil is covered by breaking the soil above the transplant hole.

The seedling supply device 56 is disposed on the upper rear side of the main frame 8 and supports a seedling tray T which accommodates a large number of soil block seedlings vertically and horizontally in a backwardly inclined manner and intermittently feeds vertically and horizontally. Seedling tray feeding device 59 to be set, and a seedling tray T
And a seedling delivery device 60 that takes out seedlings one by one from the plant and conveys them to the planting body 55. The seedling tray T is made of plastic, is formed to be thin, has flexibility, and has a large number of pot portions P arranged in a grid pattern at a predetermined pitch in the vertical and horizontal directions.
And the opening edges of the pot portion P are connected to each other in a planar manner by a tray upper wall. Then, the pot portion P is filled with floor soil, sowed and seedling there, so that soil block seedlings are grown.

The seedling feeding device 60 has a seedling removal claw 61 and a claw operating mechanism for driving the seedling removal claw 61. The seedling removal claws 61 are formed of a round bar material with a sharp tip, are provided in a pair on the left and right, and are juxtaposed so as to move closer to the tip as they move toward the tip. The nail operating mechanism reciprocates the seedling extracting nail 61 between the seedling tray T and the planted body 55 while changing the posture of the seedling extracting nail 61. The pawl operation mechanism is mounted and supported on a gear case 63 fixed to a support made of a plate material fixed on the main frame 8. The input shaft of the gear case 63 is connected to the transmission case 4 via a universal joint 64 from the transmission case 4. The power is transmitted, and the power output from the gear case 63
The claw operating mechanism and the seedling tray feeding device 59 are driven. The seedling removal claw 61 advances from the front of the seedling tray T toward the seedling tray T, pierces the floor soil in the pot portion P, and then retreats with respect to the seedling tray T (the seedling tray T).
(In the direction away from the ground), the floor soil (seedling) is taken out from the pot portion P.

After that, the seedling removal claw 61 is changed to a substantially downward posture, the taken-out seedling is placed in a downward posture, and moves so that the seedling is positioned above the planted body 55. And the planting body 55 located on the upper part of the movement locus
Next, the seedlings held by the seedling extraction nails 61 are pushed out of the seedling extraction nails 61 and separated, and dropped into the planted bodies 55 from above. Thereafter, the seedling removal claw 61 returns to the original position and repeats the above operation. As shown in FIGS. 10 and 11, the seedling tray feeding device 59 includes a seedling table 7 on which the seedling tray T is placed.
The seedling mounting table 70 is supported by the main frame 8 so as to be movable in the left-right direction.

The seedling mounting table 70 has a mounting plate 72 for supporting the bottom of the seedling tray T over a row of pot portions P. The mounting plate 72 is arranged between the left and right side plates 73 in an inclined shape (rearward inclined shape) which shifts downward as it goes forward, and is divided into front and rear portions as shown in FIG. . The front component 72A of the mounting plate 72 is fixed to the side plate 73, and the rear component 72B is pivotally attached to the front component 72A via a hinge 66 so as to be rotatable around a left-right axis. And can swing up and down.

The rear structural body 72B has a side wall 67 extending upward from both left and right side edges, and a stay 68 is fixed to an outer surface of the side wall 67.
5 is fixed to the side plate 73, whereby the vertical swing of the rear component 72B is regulated. Further, the bolt insertion hole 71 formed in the stay 68 (or the side plate 73) is formed in an arc shape centered on the swing axis of the rear component 72B. Therefore, the bolt 65
, The rear component 72B is swung up and down, and the bolt 65 is tightened again, so that the inclination angle of the rear component 72B (relative to the front component 72A) can be adjusted.

The seedling tray T is inserted at the center in the left-right direction on the seedling tray mounting surface side of the mounting plate 72 between the pot portions P so as to restrict the movement of the seedling tray T in the left-right direction. T
Is provided along the mounting plate 72 in a downward direction (tray longitudinal feeding direction A). In the seedling tray feeder 59, the seedling tray T is moved in the left-right direction while the seedling tray T is placed on the mounting plate 72, so that the seedling tray T is intermittently fed in the left-right direction. You can do it.

The seedling mounting table 70 is stopped when the seedlings are taken out from the pot portion P by the seedling removal claws 61, and after the seedlings are taken out from the pot portion P,
Are moved in the left-right direction by one pitch in the horizontal arrangement direction (left-right direction). Further, the seedlings are taken out in order from the pot P on one end side in the left-right direction of the front row in the tray longitudinal feeding direction A. When the seedlings are taken out from the pot P in one horizontal row, the seedling tray T is moved by the vertical feeding mechanism to the pot. P is transported in the tray longitudinal feed direction A by one pitch in the vertical arrangement direction (a direction perpendicular to the horizontal arrangement direction and coincides with the tray longitudinal feed direction A), and then in the opposite direction to the above. The seedlings are taken out and taken out. By repeating this operation, all the seedlings are taken out from the seedling tray T.

At the front (lower part) of the tray longitudinal feed direction A between the left and right side plates 73, there is provided a longitudinal feed drive shaft 76 arranged in the left and right direction. Is provided with a vertical feed driven shaft 77 arranged in the left-right direction. A pair of left and right drive sprockets 78 is fixed to the drive shaft 76, and a pair of left and right driven sprockets 79 is fixed to the driven shaft 77. These left and right sprockets 78, 79 are located on both left and right sides of the seedling tray T. I do. An endless longitudinal feed chain 80 is mounted on the drive sprocket 78 and the driven sprocket 79, and is attached to the chain 80 so as to protrude inward in the left-right direction. Vertical feed pins 81 which are inserted into the gaps between the pot portions P in the vertical arrangement direction are provided at predetermined intervals in the chain length direction.

Therefore, the drive shaft 76 is moved in the direction indicated by the arrow B in FIG.
, The seedling tray T is pushed by the vertical feed pin 81 to move the seedling tray T in the tray vertical feed direction A.
It can be transported to Then, when the seedling mounting table 70 moves to the left and right ends, the vertical feed drive shaft 76 moves the seedling tray T by one pitch in the vertical arrangement direction of the pots P by the vertical feed operating means. It is adapted to be rotated in the direction B shown in FIG. Thus, at the time when the removal of the seedlings from the horizontal row of pot portions P is finished, the seedling tray T is vertically fed in the tray vertical feeding direction A by one pitch in the vertical arrangement direction of the pot portions P. I have.

On the tray mounting surface side of each of the left and right side plates 73,
A tray guide 82 is provided to regulate the movement of the left and right edges of the upper wall of the tray T in the direction away from the mounting plate 72 to guide the tray T in the tray longitudinal feed direction A. Therefore, the tray T is configured to be slid forward from the rear side of the tray longitudinal feed direction A to be supplied (set) on the mounting plate 72. In the seedling mounting table 70 having the above-described configuration, the seedling tray T is inclined backward, so that when the seedling tray T is set on the mounting plate 72, the seedling tray T is configured to slide in the tray longitudinal feed direction A by its own weight. However, in the transplanting operation on an inclined ground, the mounting plate 7
2 may become slanted with respect to the up-down direction, and may not slip under its own weight.

In such a case, the seedling tray T can be slid in the tray longitudinal feed direction A by its own weight by steeply (sudging) the rear component 72B of the mounting plate 72 with respect to the vertical direction. It is configured to be able to. In addition, the twin sensor system of prioritizing the front roller 57, which is controlled by the front roller 57 on the front side of the planting body 55 and the rear roller 58 on the rear side, is used to control the lifting and lowering of the body 3 of the transplanter. Is mainly detected by the front roller 57,
When it cannot be detected by the front roller 57, the rear roller 5
8 can be performed.

As shown in FIG. 13, the rear roller 58
A swing arm 8 whose front end side is pivotally attached to a bracket 84 fixed to the planting frame 10 so as to be rotatable around a left-right axis.
5 at the rear. A rear portion of the swing arm 85 is suspended via a spring 87 at one end of an adjustment lever 86 pivotally attached to the main frame 8 so as to be rotatable around a left-right axis. The side is locked by a locking member 88 fixed to the main frame 8 and an adjustment lever 86
Is restricted.

The locking member 88 is provided with a plurality of locking portions for restricting the rotation of the adjustment lever 86 at intervals in the rotation direction of the adjustment lever 86, and changes the locking position of the adjustment lever 86. Thus, the ground pressure of the rear roller 58 can be changed. The front roller 57 is rotatable around a left-right axis at a rear portion of a swing frame 90 that is rotatably supported about a left-right support shaft 91 at a lower part of the transmission case 4 in the front-rear direction. Being pivoted. Therefore, as the front roller 57 follows the change in height of the upper surface of the ridge R, the swing frame 90 moves
By swinging around one time, the height change of the ridge R is detected.

An interlocking member 92 interlockingly connected to a control valve for controlling the elevating cylinder 47 is supported on the support shaft 73 so as to be swingable relative to a swing frame 90 around the left and right axes. Spring hooks 93 and 94 are provided at the front of the swing frame 90 and the interlocking member 92, respectively, and an urging means 95 made of a tension coil spring is interposed between the spring hooks 93 and 94. At the rear of the interlocking member 92, the front end of the outer cable 89A of the Bowden cable (regulating means) 89 is attached so as to be adjustable in the lengthwise mounting position, and the front end of the inner cable 89B of the Bowden cable 89 swings. Locked to the frame 90.

The urging force of the urging means 95 does not increase due to the pressing force acting on the front roller 57 from the ground during the normal planting operation.
7 follows the upper surface of the ridge R, so that the swing frame 9
0 and the interlocking member 92 swing integrally about the support shaft 73. An arc-shaped long hole 96 is formed in the front upper part of the interlocking member 92, and a pin 97 is slidably fitted in the long hole 96. It is pivoted to one end.

An intermediate portion of the lift valve arm 98 is rotatably supported by a control valve for a lift cylinder fixed to an upper portion of the transmission case 4 around a left-right axis via a support shaft 99. At the other end of 98, an engagement groove 1
00 is formed. A pin 102 provided at one end of an operation lever 101 formed of a bell crank is engaged with the engagement groove 100, and an intermediate portion of the operation lever 101 is attached to a rotary spool 103 of a control valve for a lifting cylinder. Have been. Therefore, when the front roller 57 is lowered, the swing frame 90 and the interlocking member 92 swing clockwise in FIG.
1 rotates around the support shaft 99 in the counterclockwise direction in FIG. 1, whereby the one end of the operation lever 101 is pulled up, and the rotary spool 103 of the control valve for the elevating cylinder is operated in the direction to lower the body 3, The body 3 descends until the piston rod of the elevating cylinder 47 operates in the retracting direction and the rotating spool 103 returns to the neutral position.

When the front roller 57 rises, the swing frame 90 and the interlocking member 92 move around the support shaft 91 as shown in FIG.
Is pivoted in the counterclockwise direction of
1 is rotated clockwise in FIG. 1, whereby one end of the operating lever 101 is pulled down, and the rotating spool 103 of the control valve for the lifting cylinder is operated in a direction to raise the body 3, and The body 3 rises until the piston rod operates in the projecting direction and the rotating spool 103 returns to the neutral position. The arc shape of the long hole 96 is as follows.
With respect to the swing operation of the swing frame 90 around the support shaft 91,
The swing motion of the lift valve arm 98 around the support shaft 99 is formed in an arc having a radius such that the swing motion is proportional, and the change in the height of the ridge R is accurately transmitted to the control valve 77. The radius of the long hole 96 can be obtained by simulation using a CAD or by calculation or the like.

One end of a sensitivity spring 104 composed of a tension spring is hooked to the other end of the operation lever 101, and the other end of the sensitivity spring 104 is hooked to a hook member 105 attached and fixed to the main frame 8. The pressing force of the front roller 57 against the upper surface of the ridge R can be changed by changing the position at which the sensitivity spring 104 is hooked on the hook member 105.
The follow-up sensitivity to the upper surface of the ridge R of No. 7 can be adjusted. The swing arm 85 and the elevating valve arm 98 are interlocked and connected by an interlocking mechanism. This interlocking mechanism
A bell crank 107 pivotally attached to the main frame 8 so as to be rotatable around the left and right axes, a link 108 for linking one end of the bell crank 107 and the swing arm 85 to each other, and a second end of the bell crank 107. An interlocking rod 110 for interlockingly connecting a fixed connecting plate 109 to the elevating valve arm 98, and a turnbuckle 111 is interposed in the middle of the interlocking rod 110.

The swing arm 85 of the link 108
The position of connection to the rear roller 58 can be changed, and the height of the rear roller 58 can be adjusted. Interlocking rod 110
The pin 112 pivotally attached to the connecting plate 109 is fitted to the longitudinal groove 114 formed in the connected plate 113 fixed to the interlocking rod 110 so as to be slidable in the longitudinal direction. It is interlocked and linked. by this,
Even if the front roller 57 moves up and down during the planting operation, the pin 112 relatively slides in the long groove 114 so that the front roller 57 is allowed to move up and down. The control valve is not affected.

During the planting operation near the exit (the end in the planting direction) of the ridge R, when the front roller 57 comes off the ridge R, the pin 112 is turned into the long groove 11.
The front roller 57 is hung on the front end of the body 4 and the rear roller 58 is suspended. The rear roller 58 functions as a detection roller for detecting the height of the upper surface of the ridge R in order to control the vertical movement of the machine body 3.
The height of the front roller 57 relative to the transmission case 5 can be adjusted. Inner cable 8
0B, the swing frame 90 is moved to the interlocking member 9.
13, the rotary spool 103 of the control valve for the lifting cylinder is moved in the direction of lowering the machine body 3 in accordance with the swing of the swing frame 90. When the body 3 descends and the inner cable 80B is loosened, the swing frame 90 swings clockwise relative to the interlocking member 92 in the clockwise direction in FIG. 3 is moved in a direction to raise the body 3 so that the body 3 is raised.

[0045]

According to the present invention, the mounting angle of the front axle with respect to the left-right direction can be freely changed, so that the left and right front wheels are inclined so as to move inward in the left-right direction as going forward. The shape can be inclined such that it moves outward in the left-right direction as it goes upward, so that the straightness of the traveling body can be ensured. Also, by allowing the front axle to change its mounting angle with respect to the left and right direction back and forth, and by allowing the front axle to change its mounting angle with respect to the left and right direction up and down,
Depending on the situation, the left and right front wheels may have an inclined shape that shifts inward in the left-right direction as going forward, or an inclined shape that shifts outward in the left-right direction as going upward.

[Brief description of the drawings]

FIG. 1 is an overall side view of a transplanter.

FIG. 2 is a plan view of the traveling body.

FIG. 3 is a front view of the front wheel support device.

FIG. 4 is a rear view of one embodiment of a front wheel mounting structure.

FIG. 5 is a plan view of one embodiment of a front wheel mounting structure.

FIG. 6 is a side view of one embodiment of a front wheel mounting structure.

FIG. 7 is a plan view showing a state where the direction of the front wheel is changed.

FIG. 8 is a side view showing another aspect of the front wheel mounting structure.

FIG. 9 is a diagram.

FIG. 10 is a side view of a seedling mounting table.

FIG. 11 is a plan view of a seedling mounting table.

FIG. 12 is a side sectional view of a rear upper portion of a seedling mounting table.

FIG. 13 is a schematic side view of a ridge height sensing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Running body 6 Front wheel 7 Rear wheel 23 Front axle

Claims (2)

[Claims] 1. A traveling body comprising a pair of left and right front wheels and a pair of left and right rear wheels, wherein a mounting angle of a front axle for rotatably supporting the front wheels with respect to a left and right direction is freely changeable. Front wheel mounting structure for the body. 2. A traveling body having a pair of left and right front wheels and a pair of left and right rear wheels, wherein a front axle for rotatably supporting the front wheels has a mounting angle with respect to the left and right directions which can be changed back and forth. A front wheel mounting structure for a traveling body, wherein a mounting angle of an axle with respect to a left-right direction can be changed vertically.