JPH0823721A - Transplanter - Google Patents

Abstract

PURPOSE:To provide a transplanter having a traveling device designed to secure its straight-advancing nature by supporting a pair of left and right front wheels by a king pin device and also maintain king pin angle (caster angle) as set even if vehicle height is regulated owing to mounting the king pin by a parallel link device. CONSTITUTION:In this transplanter equipped with a machine body 7, a traveling device 8 supporting the machine body 7 and a transplanting device 2, the traveling device 8 is made up of a pair of left and right front wheels 9 as steering wheels and a pair of left and right rear wheels 9 as driving wheels, and the front wheels 9 are mounted, via a parallel link device 23, on a king pin device 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transplanter for vegetables and the like, and more particularly to an improved traveling device.

[0002]

2. Description of the Related Art As a transplanter of this type, there is one having a traveling device having a pair of left and right front wheels and a pair of left and right rear wheels (see JP-A-5-6).

[0003]

However, the conventional traveling device has no kingpin means on the front wheels, and has a problem in straightness. Further, the pair of left and right rear wheels is a drive wheel, and when the transplantation device is provided, the driving force of one of the pair of left and right rear wheels becomes large, and thus the straightness is likely to be off.

In particular, when performing a planting operation on a flat ridge, since the copying roller does not function, it is easy for the straightness to go wrong. Therefore, the present invention secures straightness by supporting the pair of left and right front wheels with a kingpin device, and further, even if the vehicle height is adjusted by mounting the kingpin device with a parallel link device,
An object of the present invention is to provide a transplanter having a traveling device in which a kingpin angle (caster angle) is maintained as set.

[0005]

The present invention takes the following technical means in order to achieve the above-mentioned object. That is, the present invention is a transplanter including a machine body 7, a traveling device 8 that supports the machine body 7, and a transplant device 2, wherein the traveling device 8 includes a front wheel 9 that is a pair of left and right steering wheels. The front wheel 9 is attached to the kingpin device 15 via a parallel link device 23. The rear wheel 10 is a pair of left and right driving wheels.

At least one of the left and right front wheels 9 is mounted around the kingpin 19 so as to be adjustable by the angle adjusting means 25. The left and right front wheels 9 are steerable from the hand. The pair of left and right front wheels 9 and the pair of left and right rear wheels 1
0 is a feature that the vehicle height can be adjusted at the same time.

[0007]

Operation: The traveling device 8 moves along the ridges M to plant seedlings in the ridges M. Since the left and right front wheels 9 of the traveling device 8 are supported by the kingpin device 15, the straightness is good. Since the kingpin device 15 is mounted by the parallel link device 23, the caster angle θ is maintained as set even if the vehicle height is changed.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1 showing the overall configuration in side view and FIG. 2 showing in plan view, the transplanter includes a moving device 1 and an implanting device 2 provided in the moving device 1.
Hereinafter, the advancing direction of the transplanter is referred to as the front-rear direction, and the lateral direction orthogonal to the advancing direction is referred to as the left-right direction.

The moving device 1 includes a body frame 3, an engine 4 and a mission case 5 mounted on the frame 3.
And a machine body 7 including the handle 6 and the like, and the machine body 7
And a traveling device 8 for supporting and moving. The traveling device 8 has a front wheel 9 which is a pair of left and right steering wheels, and a rear wheel 10 which is a pair of left and right driving wheels. However, the rear wheel can be an infinite traveling body such as a crawler.

A front wheel support device 11 is provided at a front end portion of the vehicle body frame 3, and the support device 11 is composed of an upper and lower first shaft 12 and a second shaft 13 projecting to both sides in the left-right direction. The first shaft 12 is supported by the vehicle body frame 3 so as to be rotatable about its axis, and both left and right sides of the first shaft 12 are formed of hexagonal pipe material. This first
A front wheel support arm 14 is attached to the hexagonal pipe member of the shaft 12 such that the front wheel support arm 14 is not rotatable relative to the shaft 12 and is movable in the axial direction. The front wheel 9 is provided below the front wheel support arm 14 via a kingpin device 15 so as to be freely rotatable.

A lock bolt 16 is provided on the front wheel support arm 14, and by tightening the lock bolt 16, the support arm 14 and the first shaft 12 are fixed, and the lock bolt 16 is loosened. , Relative movement of both is possible. That is, the pair of left and right front wheels 9 are independently adjustable in left and right positions.
Further, the pair of left and right front wheels 9 are made of hollow metal, the left and right facing surfaces are formed in a tapered shape, and the tapered surfaces are formed so as to follow the slope of the ridge of the ridge well.

In the kingpin device 15, as shown in FIGS. 3A and 3B, a pair of upper and lower holder receivers 18 are fixed to a flat bracket 17, and a front caster angle θ is provided between the holder receivers 18. Then, the king pin 19 is supported by the holder cylinder 20, and the front wheel 9 is rotatably supported by the holder cylinder 20 via the axle 21. Here, the front wheel 9 secures the straight running property by the king pin 19. There is.

A lower portion of the front wheel support arm 14 is rotatably supported by a bracket 17 on a bracket 17, and another support arm 24 which constitutes a parallel link device 23 in cooperation with the support arm 14 is provided with a shaft 25. The second shaft 1 is supported by the bracket 17 by the second support arm 24.
Both ends of 3 are rotatably supported, and the first and second shafts 12 and 13
Both ends of the parallel link device 23 in cooperation with the bracket 17
Has an arm 26.

By supporting the front wheel 9 by the parallel link device 23 via the kingpin device 15, the front caster angle θ of the kingpin 19 even if the front wheel 9 is vertically swung.
Is maintained as it is, and even when the vehicle body 7 is relatively supported by the traveling device 8 in the upper and lower positions, the front wheels 9 ensure straight traveling performance. The steering angle can be adjusted by mounting the front wheel 9 around the kingpin 19 so that the angle can be adjusted. Therefore, as shown in FIGS.
An angle adjusting means 25 is provided across the arm 20A protruding from 0 and the bracket 17.

The angle adjusting means 25 inserts the lock bolt 27 supported by the pin 24B on the arm 20A and the lock bolt 27 into the bracket 17, and the bracket 1
7 includes lock nuts 28 screwed into the lock bolts 27 on both sides, and by adjusting the position of the lock nuts 28 with respect to the lock bolts 27, the direction of the front wheel 9 can be changed as shown in FIG. 3 (A). Is.

The steering angle of the front wheel 9 can be adjusted before the work by the angle adjusting means 25. However, as shown in FIG. It is also possible to steer from the hand with the tie rod 31 at this time.
It is desirable that they be linked with each other. As shown in FIG. 5, an axle case 32 is provided on the left and right side surfaces of the transmission case 5 or the vehicle body frame 3 so as to project outward in the left and right directions.
Is provided, and an axle 34 that projects outward in the left-right direction is provided at a lower portion of the transmission case 33, and the rear wheel 1 is attached to the axle 34.
0 is fixed.

A plurality of holes 35 are provided in the axle 34 along the axial direction, and by selecting one of the holes 35, the mounting position of the rear wheel 10 in the left-right direction can be adjusted. . The axle case 32 includes a first tubular portion 36 that is rotatably provided on the machine body 7, and a second tubular portion 37 that is provided on the first tubular portion 36 so as to be relatively unrotatable and extendable in the left-right direction. The transmission case 33 is fixed to the second tubular portion 37.

A first feed screw device 38 is provided between the first tubular portion 36 and the second tubular portion 37. The feed screw device 38 has a female screw cylinder 39 fixed to the first tubular portion 36 with a horizontal axis, and a horizontal axis to be screwed into the female screw tube 39. And a male screw shaft 40 rotatably and immovably provided in the second cylinder portion 37 in the axial direction. A tool engaging portion 41 is formed at the end of the male screw shaft 40, and a tool such as a wrench is engaged with the engaging portion 41 to form the tool engaging portion 41 at the end of the male screw shaft 40. By engaging a tool such as a spanner with the engaging portion 41 and rotating the male screw shaft 40, the second tubular portion 37 is configured to be movable in the left-right direction with respect to the first tubular portion 36. There is.

A transmission shaft 42, which can be expanded and contracted when the axle case 32 is expanded and contracted, is inserted into the axle case 32, and an end portion of the transmission shaft 42 and the axle 34 are inserted into the transmission case 33. A transmission means 43 such as a chain for interlocking the two is incorporated. Then, the power from the engine 4 is transmitted to the transmission shaft 42 via the transmission case 5, and the power transmitted to the transmission shaft 42 is transmitted to the rear wheel 10 via the transmission means 43 and the axle 34. Transmitted.

As shown in FIG. 2, the machine body 7 is provided with a vehicle height adjusting hydraulic cylinder 44 which extends and contracts in the front-rear direction, and an arm 45 protruding in the left-right direction is provided in the cylinder 44. Rods 46 are provided at both ends of the rod 46, respectively, and the rods 46 are engaged with flanges projecting from the first tubular portion 36. Further, one end of the arm 45 and the first shaft 12 for supporting the front wheel are connected via a front wheel retracting hydraulic cylinder 47. The vehicle height adjusting hydraulic cylinder 44 and the front wheel retracting hydraulic cylinder 47 are driven by hydraulic oil from the hydraulic pump.

Further, as shown in FIG. 3, a ridge height detecting device 48 is provided on the machine body 7, and the detecting device 48 is provided with an arm pivotally supported on a rear portion of the machine body so as to be vertically swingable. An installation roller provided at the lower end of the arm so as to be freely rotatable, an angle sensor for detecting a rotation angle of the arm, and the like.
With the front wheel retracting hydraulic cylinder 47 hydraulically locked, the axle case 32 of the rear wheel 10 and the first shaft 12 of the front wheel 9 are locked.
And are linked together. Therefore, in this state, when the vehicle height adjusting hydraulic cylinder 44 is expanded / contracted, the axle case 32 is rotated around the axis of the transmission shaft 42 via the arm 45 and the rod 46, and the transmission case 33 is vertically rocked. The relative height between the rear wheel 10 and the machine body 7 is changed by moving the front wheel, and the first front wheel is moved through the front wheel retreat hydraulic cylinder 47.
The support shaft 12 is rotated, and the vehicle height is changed at the same time by the same relative height between the front wheels 9 and the machine body 7. That is, the height of the machine body 7 is adjustable while maintaining the parallel state.

This relative height is changed when it is planted in the high ridge M shown in FIG. 1 and when it is planted in the flat ridge. In either case of the high ridge or the flat ridge. However, since the front wheel 9 has the kingpin device 15 supported by the parallel link device 23, the caster angle θ of the kingpin 19 is not changed. During traveling (during work), the vehicle height adjusting hydraulic cylinder 44 is controlled to expand and contract by the ridge height detected by the ridge height detecting device 48.

When the hydraulic cylinder 47 for retracting the front wheels is expanded and contracted, only the front wheels 9 swing vertically, so when the direction is changed to reach the end of the ridge, the front wheels 9 are retracted upward in that direction. Facilitating conversion. The handle 6 is composed of a pair of left and right pipe members, has a horizontal portion extending rearward from the rear portion of the mission case 5 or the body frame 3 while maintaining a substantially horizontal shape, and extends obliquely upward from the rear end of the horizontal portion. It is composed of an inclined portion and a grip portion that extends rearward from the upper end of the inclined portion. The handle 6 is provided with various operation levers such as a clutch lever, switches, an operation panel and the like (not shown).

As shown in FIG. 2, the transplant device 2 is arranged between the rear portion of the mission case 5 and the grip of the handle 6. The transplanting device 2 comprises a seedling supply device 49, a seedling relay device 50, a seedling planting device 51, and a soil covering device (ground roller device) 52 that are integrally unitized. This transplantation device 2 comprises a front pivot device 53
It is attached to the machine body 7 by a balance device 54 so as to be vertically rotatable.

That is, as shown in FIG. 5, the pivot device 53 has an implanting device mounting bracket 55 fixed to the rear portion of the machine body 7. Since the bracket 55 is provided so as to be offset from the center of the machine body 7 in the left-right direction, the displaced side and the machine body side are connected by a reinforcing member 56. A pair of left and right bearings 57 are provided on the transplanter mounting bracket 55, and both ends of a drive shaft 58 for driving the transplanter are rotatably supported by the bearings 57. An input sprocket 59 is attached to one end of the drive shaft 58.
Are rotatably provided. This sprocket 5
9 and the drive shaft 58 can be coupled and separated via a clutch 60. The clutch 60 is composed of an electromagnetic clutch. The sprocket 59 is rotationally driven by the power from the engine 4.

The drive shaft 58 is formed as a spline shaft, and a cylinder shaft 61 is spline-fitted to the drive shaft 58 so as to be movable in the left and right directions. A drive sprocket 62 is fixed to the end of the cylinder shaft 61. An outer cylinder 63 is fitted on the cylinder shaft 61 via a bearing so as to be relatively rotatable and immovable in the axial direction. A second lead screw device 64 is provided between the outer cylinder 63 and the transplant device mounting bracket 50.

The second lead screw device 64 is the same as the outer cylinder 6 described above.
3 has a flange 65 which is fixed in the middle portion in the axial direction and projects in the radial direction, and the flange 65 is provided with an arc-shaped elongated hole centered on the drive shaft 58. The nut 66 is fitted in the elongated hole such that the nut 66 cannot rotate, cannot move in the axial direction, and can move in the elongated hole. A feed screw 67 that is screwed into the nut 66 is provided on the transplantation device mounting bracket 55.

Therefore, when the second lead screw device 64 is operated, the transplanting device 2 moves in the left-right direction, and the implanting strip can be changed. A vertical frame 67 is provided so as to be vertically movable via the pivotal support device 53, and the frame 67 is provided with the vertical frame 67.
9, a seedling relay device (seedling extracting device) 50, a planting device 51, a ground roller device 52, and a multi-cut device 68 are provided as units, and a counter balance device 54 for balancing the weight of these units is provided. .

The balance device 54 is a support 69 made of a square pipe which is fixed to the vertical frame 67 via a bracket 69A at one end and extends forward, and the support 69.
A weight mounting body 70 that is freely inserted into the
A weight 72 is attached by a mounting hole 71 formed in the mounting body 70, and the weight 72 is the mounting body 70.
By extending and contracting, the balance can be adjusted, and after adjustment, it can be fixed with the lock bolt 73.

That is, when the lock bolt 73 is loosened and the mounting body 70 is pulled out forward, the weight of the seedling feeding device 49 and the like which is unitized and attached to the vertical frame 67 becomes light, and conversely, the mounting body 70 is moved backward. When pushed in, seedling feeding device 49
The weights such as “height” become heavy, and the ground pressure of the ground roller device 52 which can quickly respond to the hardness of the soil can be adjusted. A gas cylinder 74 for the multi-cutting device 68 is mounted on the support 69 by a holder 75, and the gas cylinder 74 can be used as a counterweight, so that the cylinder 74 can be mounted on the mounting body 70. You can

The seedling feeding device 49 can feed a seedling box having pots vertically and horizontally by an electric motor, and can be taken out by projecting seedlings from behind with a pusher. The seedling relay device 50 and the planting device 51 are driven from the sprocket 62 shown in FIG. That is, the seedling relay device 50 is the extraction arm 50.
A, and the planting device 51 is provided with a planting claw 51B by means of parallel link support means 51A which is vertically movable, so that seedlings are planted in the holes made by the multi-cutting means.

The multi-cutting means burns the gas from the gas cylinder 74 with a burner and burns the multi-film laid in the ridges at a constant pitch prior to planting to cut. Since the seedling supply device 49, the planting device 51 and the like are assembled to the vertical frame 67, one rear wheel 10, which is a drive wheel, in the figure, the left rear wheel 10 has a ground pressure lower than that of the right rear wheel. Since the diffracting device is not provided in the drive system for the left and right rear wheels, the driving force for the rear wheel 10 on the left side is large, and this causes the straight-running property to be easily misaligned.

Therefore, by making the right front wheel 9 inward by the angle adjusting means 25, resistance is imparted and straight traveling control is facilitated.

[0034]

As described in detail above, according to the present invention, straight traveling control by the traveling device is easy and straight traveling performance can be secured.

[Brief description of drawings]

FIG. 1 is a side view of the overall configuration showing an embodiment of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 shows a first embodiment of a front wheel steering system,
(A) is a plan view and (B) is an elevation view.

FIG. 4 is a plan view showing a second embodiment of the front wheel steering system.

FIG. 5 is a plan view showing details of the pivotal support device.

6A and 6B show details of a balance weight device, FIG. 6A being a plan view and FIG. 6B being a side view.

[Explanation of symbols]

 2 Transplanting device 7 Aircraft 8 Traveling device 9 Front wheel 10 Rear wheel 15 Kingpin device 23 Parallel link device 51 Planting device

Claims (4)

[Claims] 1. A transplanter comprising a machine body (7), a traveling device (8) supporting the machine body (7), and a transplanting device (2), wherein the traveling device (8) is a pair of left and right. The front wheel (9) is a steering wheel and the rear wheel (10) is a pair of left and right driving wheels. The front wheel (9) is attached to the kingpin device (15) through a parallel link device (23). A transplanter characterized by being used. 2. At least one of the left and right front wheels (9) is
2. An angle adjusting means (25) around the kingpin (19) so that it can be adjusted freely.
The transplantation machine according to 1. 3. Transplanter according to claim 1, characterized in that the left and right front wheels (9) are steerable from the hand. 4. The transplanter according to claim 1, wherein the pair of left and right front wheels (9) and the pair of left and right rear wheels (10) are adjustable in vehicle height at the same time. .