JPH114602A - Walking type farm work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide walking type agricultural equipment capable of reducing a load for lowering a handle to lift front wheels from the surface of the ground when turning the equipment by attaching a hydraulic actuator for lifting and lowering the front wheels and rear wheels at the rear part of the rear wheels. SOLUTION: The objective agricultural equipment is obtained by installing front wheels 11L, etc., and rear wheels 8L, etc., installed so as to be freely lifted or lowered in a machine body 6 having a handle 39 at the rear part, and a hydraulic actuator 13 for lifting and lowering the front wheels 11L, etc., and the rear wheels 8L, etc., installed at the rear part of the rear wheel 8L, etc., in the machine body 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is effectively used for a seedling plant or the like which works in a field.

[0002]

2. Description of the Related Art In this type of agricultural working machine, a front wheel and a rear wheel are provided on a body having a handle at a rear portion so as to be able to move up and down, and a hydraulic actuator for raising and lowering a front wheel and a rear wheel is provided before the rear wheel. Mounted on

[0003]

When the agricultural work machine reaches the headland, the front wheel and the rear wheel are lowered, the body is raised, then the handle is pushed down, the front wheel is raised from the ground surface, and the rear wheel is centered. (In the case of two rear wheels, turning is performed by stopping the rotation of the inner rear wheel.) The load for pushing down the handle was heavy, and there was a risk that turning operations would be difficult for women and women.

[0004]

In order to solve the above-mentioned problems, the present invention provides a vehicle body 6 having a handle 39 at a rear portion, in which front wheels 11L and 11R and rear wheels 8L and 8R are provided so as to be able to move up and down. A walk-behind agricultural work machine in which hydraulic actuators 13 for raising and lowering the front wheels 11L and 11R and the rear wheels 8L and 8R are attached to the body 6 later than the rear wheels 8L and 8R.

[0005]

Next, an embodiment of the present invention will be described. An agricultural work device (seedling plant in the figure) is mounted on a walking-type traveling vehicle body to form a walkable agricultural work machine (in the figure, a walk-type seedling plant that works in the field). The traveling vehicle body is configured as follows. Engine 2 and main gear box 3 before and after pipe frame 1
The transmission case 4 and the handle frame 5 extend upward from the left and right sides of the main gear box 3 to form an airframe 6.
The front portions of the pair of chain cases 7L and 7R are rotatably mounted on the left and right sides of the main gear box 3, and the front wheels 8
L, 8R are attached. The horizontal shaft 9 is fixed to the front part of the engine 2 and the front parts of a pair of supporting legs 10L and 10R are rotatably attached to both ends thereof.
1L and 11R are provided.

After the power of the engine 2 is introduced into the main gear box 3 by the belt 2a, it passes through the transmission therein and passes through the respective chain cases 7L, 7R to form the rear wheels 8L, 8R.
R is reached, and these rotations allow the body 6 to move forward in the field. A pair of support plates 12 are fixed to the transmission case 4 and the handle frame 5. A hydraulic actuator 13 is constituted by a hydraulic cylinder 13a whose upper end is rotatably attached to the support plate 12 and a piston rod 13b projecting downward from the hydraulic cylinder 13a. The horizontal shaft 14 is attached to the support plate 12, and bell cranks 15L and 15R are provided at both ends thereof. And the horizontal bar 1 at the lower end of the piston rod 13b
6 are connected to one ends of the respective bell cranks 15L, 15R, and rods 17L, 17R extending forward from the other ends of the bell cranks 15L, 15R are chain cases 7L,
Arms 18L and 18R projecting upward from 7R and arms 19L and 19R projecting upward from supporting legs 10L and 10R.
Connected to The rear part of the right rod 17R is composed of a horizontal cylinder 20a and a piston rod 20b protruding forward from the horizontal cylinder 20R, and is adapted to expand and contract when the piston rod 20b comes and goes.

When the pump 21 is attached to the front end of the main gear box 3 and the oil discharged from the pump 21 is supplied to the hydraulic cylinder 13a, the piston rod 13a is pulled down, and the bell cranks 15L and 15R are turned counterclockwise in left side view. , The rods 17L, 17R move rearward to move the arms 18L, 1
8R and arms 19L and 19R are routed in the same direction,
The chain cases 7L and 7R and the supporting legs 10L and 10R rotate in the same direction, and the rear wheels 8L and 8R and the front wheels 11L and 11R.
Descends, and the body 6 rises while maintaining the same posture. When the oil is returned to a tank (not shown), the respective parts operate in reverse to the above, and the body 6 descends.

[0008] A diverter valve (not shown) from the pump 21
The piston rod 20b rises and falls with the oil supplied to the horizontal cylinder 20a via the, and the right front wheel 11R and the rear wheel 8R move up and down. The fuselage 6 tilts sideways when driving along a contour line on a slope. When the right front wheel 11R and the rear wheel 8R move up and down, the above-mentioned inclination returns to horizontal. A valve for supplying and discharging oil to the hydraulic cylinder 13a and the horizontal cylinder 20a will be described later.

The seedling plant is constructed as follows.
A pair of discs 22a is arranged below the rear part of the main gear box 3 with the front part approaching to form a groove forming device 22. By the advance of the fuselage 6, a transplant groove is formed in a field. Both ends of a seedling receiving plate 23 having a seedling opening (not shown) at the center are fixed to the transmission case 4 and the handle frame 5. At the front of the support rod 24 and the seedling receiving plate 23 projecting from the main gear box 3, a seedling mounting table 25 is supported so as to be movable left and right, and is reciprocated right and left by a moving rod 26 projecting left and right from the main gear box 3. ing.
A belt conveyor 27 is provided on the lower surface of the seedling mounting table 25, and collective seedlings of vegetables are mounted thereon. The rear end of the group of seedlings protrudes above the seedling receiving plate 23 and moves over the seedling opening by moving the seedling mounting table 25 left and right.
7 is operated so that one share in the front-back direction is paid out later.

A first case 28 is disposed to the right of the transmission case 4 and is rotated by the power of the engine 2 in a clockwise direction around a lower axis in a left side view. Second case 2
9 is attached to the distal end of the first case 28, and is rotated counterclockwise by the rotation of the first case 28 by a planetary gear therein. Note that, depending on the number of teeth of each gear, the second case 29 faces the opposite side to the direction of the first case 28 when the first case 28 faces forward or backward, and the latter when the former faces upward or downward. Also point in the same direction. The implantation case 30 is attached to the distal end of the second case 29, and the planetary gears in the implantation case 30 can be turned while maintaining the same posture in a vertically long elliptical orbit during the turning of the second case 29. . An implantation rod 31 composed of a pair of plates is attached to the implantation case 30, and the above-mentioned swivel passes through the seedling opening of the seedling receiving plate 23 during descending to hold the seedlings of one strain thereon. Then, the seedlings are transplanted so as to reach the above-mentioned transplanting groove at the lower end and place the seedling therein.

The front ends of a pair of support rods 32 are rotatably mounted on the main gear box 3, and wheels 33 mounted in the middle of each of them.
The lower end of “a” approaches to form a soil covering wheel 33, which refills the transplantation groove into which the seedlings have been transplanted from the left and right, and lightly presses both sides of the seedlings. The front end of the planting depth adjusting rod 34 is rotatably attached to the support plate 12 by a shaft 35. An elevating valve 36 is constituted by a valve box 36a rotatably mounted in the middle thereof and a valve rod 36b protruding downward so as to be able to protrude and retract therefrom. The rear ends of the left and right support rods 32 are connected by a rod 37,
The middle is connected to the lower end of the valve stem 36b. A handle 39 is fixed to the upper ends of a pair of pipes 38 extending upward from the transmission case 4 and the handle frame 5 at an angle. When the panel 40 is fixed to the handle 39 and the elevating lever 41 rotatably provided on the panel 40 is pushed forward, the valve rod 36b is raised, and the elevating valve 36 is "raised", as described above.
The oil is supplied to the hydraulic cylinder 13a, and the machine body 6 rises. When the raising / lowering lever 41 is pulled backward, the valve rod 36b is lowered and the lifting / lowering valve 36 is lowered, and the hydraulic cylinder 13a
The oil inside returns to the tank, and the aircraft 6 descends. When the raising / lowering lever 41 is stopped in the middle between the two, the raising / lowering valve 36 becomes "neutral" and closes the oil in the hydraulic cylinder 13a.
The oil discharged by the pump 21 returns to the tank, and the height of the machine body 6 is maintained in that state.

The body 6 being transplanted with the seedlings is automatically moved by the vertical movement of the earth covering wheel 33 caused by the pair of supporting rods 32 rotating up and down with respect to the main gear box 3 with the lifting lever 41 lowered. It goes up and down. That is, during transplanting of the seedling, the raising / lowering lever 41 is pulled backward to operate the "lower". Then, after the fuselage 6 descends and the earth covering wheel 33 comes into contact with the field, the valve rod 36b is pushed up and the elevating valve 36
Becomes "neutral". Then, while the fuselage 6 is moving forward, the wheels 8
L, 8R, 11L, and 11R sink more than necessary,
If the distance between the ground and the ground becomes too narrow,
6b is pushed up, and the elevating valve 36 becomes “raised”, and the airframe 6
Rises. Conversely, wheels 8L, 8R, 11L,
If 11R comes to a hard place and the space between the fuselage 6 and the ground surface becomes too wide, the earth covering wheel 33 pulls down the valve stem 36b and raises and lowers the lift valve 3
6 becomes “down”, and the aircraft 6 descends. Note that this automatic lifting and lowering works effectively when the wheels 8L, 8R, 11L, and 11R advance in the valley valleys and the seedlings are transplanted to the tops thereof, according to the fluctuation of the ridge height. Planting depth adjustment lever 3
When the hook 4 is raised and stopped, the valve box 36a moves up and down, and the "neutral" position of the elevating valve 36 is changed, so that the planting depth of the seedlings can be adjusted.

A horizontal valve 42 is mounted between the pair of support plates 12, and the oil supplied to the horizontal cylinder 20a is switched by a pendulum 43 that swings with the body 6 tilting in the left-right direction. That is, when the body 6 tilts to the upper right, the piston rod 20b protrudes, the front wheel 11R and the rear wheel 8R rise, and the tilt returns to horizontal. When tilting to the right, the piston rod 20b is pulled back, and the front wheel 11R Then, the rear wheel 8R descends and its inclination automatically returns to horizontal.

When the machine body 6 in which the seedlings are being transplanted comes to the headland, the operator pushes the elevating rod 41 forward, raises the elevating valve 36 to raise the body 6, and then moves the elevating rod 41 up. Returning to the middle position, the lift valve 36 is set to "neutral" to keep the body 6 lifted. After that, the steering wheel 39 is pushed down and the front wheel 11
L, 11R is lifted off the ground surface, and the power transmission of the rear wheel 8L or 8R inside the turn is cut off (gripping the left or right side clutch lever 44). Then, the aircraft 6 starts turning.
After turning to the predetermined position, power transmission is resumed,
Pull 1 to lower the lift valve 36. Then, the body 6 descends, and transplantation of the seedlings is restarted.

According to the above-described embodiment, the conventional seedling table 25
The hydraulic actuator 13 located under the rear wheels 8L and 8R
Later, the seedling platform 25 can be lowered. Therefore, the center of gravity is lowered, the stability of the machine body is improved, and not only the forward visibility is improved, but also the distance by which the implantation rod 31 descends the seedling is shortened, and the planting posture is improved. The hydraulic actuator 13 can be inclined forward or backward when viewed from the side. With this configuration, the handle 3
9, the center of gravity of the traveling agricultural machine is lowered, and the stability is improved.

[0016]

According to the present invention, the heavy hydraulic actuator 13 is disposed after the rear wheel 8 and the center of gravity of the body is shifted rearward, so that the handle 39 is pushed down to lift the front wheel 11 from the ground surface in turning. The load is reduced.

[Brief description of the drawings]

FIG. 1 is a side view of a walking type agricultural working machine (seedling planting machine) according to the present invention.

FIG. 2 is a plan view of a part thereof.

[Description of Signs] 6 Airframe 8L Rear Wheel (Left) 8R Rear Wheel (Right) 11L Front Wheel (Left) 11R Front Wheel (Right) 13 Hydraulic Actuator 39 Handle

Claims (1)

[Claims] 1. A hydraulic actuator 13 for vertically moving front wheels 11L and 11R and rear wheels 8L and 8R, and for raising and lowering front wheels 11L and 11R and rear wheels 8L and 8R. Is a walk-behind agricultural work machine attached to the body 6 after the rear wheels 8L, 8R.