JPS6229241B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement of a walking rice transplanter.

[Conventional technology]

In this type of rice transplanter, if the machine rolls and tilts to the left or right due to the unevenness of the tiller on which the wheels touch the ground, the height relationship between the seedling planting mechanism on both the left and right sides of the machine and the field surface will change. As a result, the planting depth of seedlings in the field becomes shallower or deeper on both the left and right sides of the rice transplanter, making it unstable.

Therefore, as a prior art, Japanese Utility Model Publication No. 53-29627 proposes a structure in which a pair of left and right wheels, which are attached to the left and right sides of the aircraft body so as to be able to move up and down, are moved up and down by hydraulic cylinders separately. It is proposed to maintain the aircraft horizontally against rolling by operating hydraulic cylinders in relation to the horizontal tilt of the aircraft, and
In this prior art, both hydraulic cylinders for horizontal control of the aircraft for raising and lowering both wheels separately are arranged so that the axes of the hydraulic cylinders extend in the vertical direction at the midpoint in the longitudinal direction of the aircraft. ing.

[Problem that the invention seeks to solve]

However, in this way, both hydraulic cylinders for horizontal control of the aircraft, which horizontalize the aircraft by moving both wheels up and down separately in response to rolling, are operated using the hydraulic pressure at the midpoint in the longitudinal direction of the aircraft. Arranging the cylinder so that its axis extends vertically increases the height of the middle part of the fuselage, making the cover that covers it larger. If a spare seedling stand is provided to place spare seedling mats, the height of this spare seedling stand will be higher, which will shift the center of gravity of the aircraft upwards and reduce the stability of the aircraft in the lateral direction. There were problems in terms of things such as:

The present invention solves the above-mentioned problems when correcting the horizontal inclination of the aircraft due to rolling by operating a pair of left and right hydraulic cylinders for horizontal control of the aircraft for each of the wheels. The purpose is to ensure rolling control in a stable state.

[Means to solve the problem]

For this reason, the present invention provides a pair of left and right wheels that are movable up and down via swing arms on both the left and right sides of an aircraft body that has an engine mounted in the front and a control handle in the rear, and a pair of left and right wheels that are movable up and down via swing arms. A pair of left and right lifting mechanisms, each equipped with a hydraulic cylinder mechanism for raising and lowering separately, and a switching valve for operating both hydraulic cylinder mechanisms to level the aircraft against a tilt in the left-right direction of the aircraft. In a walk-behind rice transplanter comprising: a hydraulic cylinder mechanism in both lifting mechanisms, the hydraulic cylinder mechanism is located outside both left and right side surfaces of the engine in a plan view of the rice transplanter, and is approximately at a distance from the longitudinal centerline of the rice transplanter; The hydraulic cylinder mechanisms are arranged at equal positions so that their axes extend in the longitudinal direction of the rice transplanter, and the rear ends of the hydraulic cylinder mechanisms are connected to the swing arm, while the front ends of the hydraulic cylinder mechanisms are connected to the engine. The front part of the aircraft is connected to the fuselage.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. In the drawings, reference numeral 1 denotes a fuselage 6 with an engine stand 4 for an engine 3 connected to the front part of a traveling transmission case 2, and a transmission case 5 connected to the rear part, and the fuselage 6.
A walking rice transplanter is shown, which is equipped with a center float 7 on the lower surface and runs in the direction of arrow A on a pair of left and right wheels 9a and 6b.The rear end of the transmission case 5 has a seedling stand 10 and four planting Seedling planting device 1 consisting of attachment mechanism 11
2 and a pair of control handles 13, side floats 8a, 8b are provided on the outside of the wheels 9a, 9b, and these floats 7, 8
The rear ends of a and 8b are attached to the body 6 such as the handle 13 so that the height can be adjusted using a seedling depth adjustment rod 24, and the front end of the central float 7 is attached to the engine stand 4.
Horizontal bars 31a, 31 are attached to the lower surface of the tips of the floats 8a, 8b so as to be movable up and down via links 27, and the tips of the floats 8a, 8b on both sides also protrude laterally from the fuselage 6.
It is attached to the tip of a via links 32a, 32a so as to be vertically movable.

The two wheels 9a, 9b are respectively attached to the tips of swing arms 14a, 14b which are rotatably attached to the traveling mission case 2 by bosses 15a, 15b at the base.
Swing arms 14a, 14 in each from the traveling transmission case 2 to which power is transmitted via
A hydraulic pump 18 is rotatably driven via a chain or the like in b, and is provided on the upper surface of the engine stand 4 to which power is transmitted from the engine 3 via a belt 17.

Bell crank type lifting levers 19a and 19b are provided on both left and right sides of the traveling transmission case 2.
A shaft 2 that penetrates the traveling transmission case 2 and is pivotally supported.
0, and is rotatably inserted into the lift lever 1.
The tips of 9a and 19b are attached to both swing arms 14.
a, 14b via rods 21a, 21b, and a double-acting hydraulic cylinder mechanism is provided at the outer side of both left and right sides of the engine 3.
The respective hydraulic cylinder mechanisms are arranged so that their axes extend in the longitudinal direction of the rice transplanter.

This both hydraulic cylinder mechanism includes a hydraulic cylinder 22
a, 22b, pistons 23a, 23b in the hydraulic cylinders 22a, 22b, and the piston 23
Piston link 25a, 25b integrated with a, 23b
and the piston connecting rod 25 which is the rear end of both hydraulic cylinder mechanisms.
a, 25b to both the lifting levers 19a,
Rods 28a and 28b are connected to the other ends of the engine 19b, respectively, and to support pieces 26a and 26b protruding from both sides of the engine stand 4 which is a part of the fuselage 6, rods 28a and 28b are pivotally connected by pins 29a and 29b. , the length can be freely adjusted by replacing the pins 29a, 29b, etc., and the hydraulic cylinder 22 in each of the rods 28a, 28b and the hydraulic cylinder mechanism.
a, 22b are connected via buffer mechanisms 30a, 30b having springs 33a, 34a, 33b, 34b in both compression and tension directions, and the wheels in each of them are connected by the operation of both hydraulic cylinders 22a, 22b. 9a and 9b are constructed so that they can move up and down separately and independently.

In this case, both the hydraulic cylinder mechanisms are provided at substantially equal distances from the longitudinal centerline of the rice transplanter in plan view. Further, pins 23a and 29b, which are connecting portions between the front ends of both hydraulic cylinder mechanisms and the fuselage 3, are located at the front side of the engine 3.

Further, 4-port 3-position switching valves 35a and 35b are provided on both sides of the upper surface of the engine stand 4, and a hydraulic pipe 36 from the hydraulic pump 18 is connected to both switching valves 35a and 35b.
Flexible hydraulic pipe 37 such as a hydraulic hose from a and 35b
a, 38a, 37b, 38b to the two hydraulic cylinders 22a, 22a, respectively, and spools 39a, 39b in both the switching valves 35a, 35b.
Spring 4 is applied to both buffer mechanisms 30a and 30b.
0a, 40a, 40b, 40b are elastically related, and when the buffer mechanisms 30a, 30b are displaced forward from the neutral position, the switching members 35a, 35b release the hydraulic pressure in the rear chambers of the hydraulic cylinders 22a, 22b. The switch is made so that hydraulic pressure enters the front chamber, and the buffer mechanism 30
If a, 30b are displaced backward, the switching valves 35a,
35b is configured to switch so that the hydraulic pressure in the front chambers of both hydraulic cylinders 22a and 22b is released and the hydraulic pressure is input into the rear chambers.

In addition, the long slot holes 41a provided at the ends of the spools 39a, 39b in both the switching valves 35a, 35b,
41b is engaged with a rod 43 that is linked to a manual lift lever 42 provided at an appropriate location such as the control handle 13 of the rice transplanter 1, and the manual lift lever 42 is used to preferentially switch both switching valves 35a and 35b. It is configured to allow switching operations.

In this configuration, while the rice transplanter is moving forward and performing rice planting work, the rice transplanter 6 may be damaged due to irregularities in the field where the float touches the ground, the tiller where the wheels 9a and 9b touch the ground, or seedling pine on the seedling platform 10, etc. When rolling to the left with respect to the running direction, the center of gravity moves to the left, so the support load on the right wheel 9b decreases, while the support load on the left wheel 9a increases, and the right wheel 9b acts as a buffer. While displacing the mechanism 30b in the forward direction, the fuselage 6
The left wheel 9a moves its shock absorbing mechanism 30a backward and moves upward toward the fuselage 6, but the right shock absorbing mechanism 3
0b in the forward direction, the right switching valve 35b interlocked with this switches to supply hydraulic pressure to the front chamber of the right hydraulic cylinder 22b, and the operation of the right hydraulic cylinder 22b causes the right wheel 9b to shift. While moving upward to approach the aircraft 6, the left shock absorbing mechanism 30a
Due to the change in the rearward direction, the left switching valve 35a linked therewith is switched to supply hydraulic pressure to the rear chamber of the left hydraulic cylinder 22a, and the left hydraulic cylinder 2
2a causes the left wheel 9a to move downward away from the body 6, so that the body 6 is returned to a horizontal state.

Then, the aircraft body 6 returns to approximately horizontal position, and both left and right wheels 9
When the supporting loads on a and 9b become equal and both buffer mechanisms 30a and 30b return to the same original position, both switching valves 35a and 35b are switched to the neutral position, and the operation of the hydraulic cylinders 22a and 22b is stopped. Therefore, the aircraft body 6 is held horizontally, and when the aircraft body 6 tilts to the right, the supporting loads on both wheels 9a and 9b are controlled to be equal by an operation opposite to that described above. This allows the aircraft body 6 to be held horizontally.

[Action/effect of the invention]

As described above, the present invention achieves the functions and effects described below by summarizing the configurations described in the claims.

A pair of left and right hydraulic cylinder mechanisms for horizontally controlling the machine body against rolling are installed at parts outside both the left and right sides of the engine located at the front of the rice transplanter machine in plan view, and at the longitudinal side of the rice transplanter. By arranging the axis of the hydraulic cylinder mechanism so that it extends in the front-rear direction of the rice transplanter at approximately equal distances from the center line, it is possible to avoid the conventional dead space in rice transplanters with engines protruding from the front of the machine. The space outside the left and right sides of the engine and in front of both wheels can be effectively used to install a pair of left and right hydraulic cylinder mechanisms to horizontally control the aircraft. It is possible to prevent the height of the middle part of the fuselage from increasing due to the installation of a hydraulic cylinder mechanism for horizontal control of the fuselage, and it is possible to downsize the cover that covers the top of the fuselage. In the case of providing the stand, the height of the spare seedling stand can be lowered and the center of gravity of the machine body can be prevented from becoming too high.

By providing both the hydraulic cylinder mechanisms at substantially equal distances from the longitudinal center line of the rice transplanter in plan view, the weights of both hydraulic cylinder mechanisms balance each other. When controlling the aircraft to hold the aircraft substantially horizontally, the dual hydraulic cylinder mechanisms can prevent the aircraft from becoming unbalanced left and right.

In a walk-behind rice transplanter, which has an engine in the front of the machine, a control handle in the rear, and wheels in the middle, the rear of the machine becomes lower due to the rolling reaction force when driving the wheels. tilt like this. Therefore, in this type of rice transplanter, it is necessary to provide a balance weight at the front end of the machine body, that is, at the front end of the engine stand, to balance the rolling reaction force, but in the present invention, balance weights are provided on both the left and right sides of the engine. The weight of both hydraulic cylinder mechanisms installed for horizontal control of the aircraft acts in balance with the rolling reaction force, so the engine The balance weight conventionally provided on the stand can be made smaller or omitted.

Further, the rear ends of both hydraulic cylinder mechanisms are connected to both swing arms, and the front ends of both hydraulic cylinder mechanisms are connected to the fuselage side at a portion on the front side of the engine, so that the swing arms of both hydraulic cylinder mechanisms are connected to each other. The length from the connecting part to the side to the connecting part to the fuselage side is longer by the amount that the front end of the hydraulic cylinder mechanism is connected to the fuselage side at the front side of the engine, and as the hydraulic cylinder mechanism expands and contracts. The swing angle when the hydraulic cylinder mechanism swings in the vertical direction becomes smaller, and the wheel load acting on both hydraulic cylinder mechanisms can be reduced from changing depending on the ascending and descending positions of the wheels. It is possible to reduce fluctuations in the wheel load acting on both hydraulic cylinder mechanisms due to the lifting and lowering of the wheels. Since it is approximately constant regardless of the position, the control characteristics when maintaining the aircraft horizontally against rolling will be approximately the same no matter where the wheels are raised or lowered, making it possible to reliably perform rolling control in a stable state. can.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a side view of a rice transplanter, FIG. 2 is a plan view thereof, and FIG. 3 is a perspective view of the apparatus. 1... Walking type rice transplanter, 2... Traveling transmission case, 3... Engine, 4... Engine stand, 6...
...Airframe, 9a, 9b...Wheels, 14a, 14b...
...Swing arm, 12...Seedling planting device, 13...
Control handle, 22a, 22b...Hydraulic cylinder, 25a, 25b...Piston link of hydraulic cylinder, 30a, 30b...Buffer mechanism, 35a, 3
5b...Switching valve.

Claims (1)

[Claims] 1. A pair of left and right wheels that are movable up and down via swing arms on each side of the aircraft, which has an engine mounted in the front and a control handle in the rear;
a pair of left and right lifting mechanisms each equipped with a hydraulic cylinder mechanism for raising and lowering the two wheels separately up and down with respect to the aircraft body; and a pair of left and right lifting mechanisms each equipped with a hydraulic cylinder mechanism for raising and lowering the wheels separately up and down with respect to the aircraft body; In a walk-behind rice transplanter, the hydraulic cylinder mechanism in both the lifting and lowering mechanisms is located outside the left and right sides of the engine in a plan view of the rice transplanter. The hydraulic cylinder mechanism is arranged so that its axis extends in the front-rear direction of the rice transplanter at approximately equal distances from the longitudinal center line, and the rear end of the hydraulic cylinder mechanism is connected to the swing arm side, while the hydraulic A walking type rice transplanter, characterized in that a front end of the cylinder mechanism is connected to the machine body at a portion on the front side of the engine.