JPS6119416A - Walking type rice planter - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to improvements to walking-type rice transplanters.

In this type of rice transplanter, if the machine body tilts to the left or right due to unevenness of the tiller on which the wheels touch the ground, the
As the height relationship between the seedling planting mechanism and the field surface changes, the planting depth of the seedlings relative to the field surface becomes shallower or deeper, making it unstable.

Therefore, as a prior art, Japanese Utility Model Publication No. 53-29627 discloses 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 that the aircraft be held horizontally by operating in relation to the tilting of the aircraft in the left and right direction. Both hydraulic cylinders for horizontal control of the fuselage are disposed in the middle of the fuselage in the longitudinal direction so that the axes of the hydraulic cylinders extend in the vertical direction.

However, in this way, both hydraulic cylinders for horizontal control of the aircraft, which horizontally level the aircraft by moving both wheels up and down separately, have their axes extending in the vertical direction at the midpoint in the longitudinal direction of the aircraft. To arrange it like this,
Since the height of the middle part of the fuselage increases, the cover that covers it becomes larger.Also, if a spare seedling stand is provided above the middle part of the fuselage to place a spare seedling cloak. However, since the height of this spare seedling stand is raised due to the side hydraulic cylinder for horizontal control of the aircraft, the center of gravity of the aircraft moves upwards, reducing the stability of the aircraft in the lateral direction. There was a problem.

Furthermore, when this type of walking-type rice transplanter changes direction in the field, it lowers both wheels to raise the machine greatly; however, in the prior art, the machine does not raise the machine greatly. This is performed using a hydraulic cylinder dedicated to lifting and lowering the aircraft, which is provided separately from the two hydraulic cylinders for horizontally controlling the aircraft. In other words, in the prior art,
The need for three hydraulic cylinders not only complicates the structure but also increases the weight of the rice transplanter.

The present invention aims to solve the above-mentioned problem when correcting the horizontal inclination of the aircraft body by operating a pair of left and right aircraft horizontal control side hydraulic cylinders for each of the wheels. be.

For this reason, the present invention provides a pair of left and right wheels that are movable up and down on both the left and right sides of an aircraft body having an engine stand at the front and a control handle at the rear, and a pair of wheels for vertically moving the wheels separately relative to the aircraft body. A walk-behind rice transplanter comprising a pair of left and right lifting mechanisms each equipped with a hydraulic cylinder, and a switching valve for operating both hydraulic cylinders to level the machine body against leftward inclination of the machine body. , the hydraulic cylinders in the both lifting mechanisms are disposed on the left and right sides of the engine stand so that the axis of the hydraulic cylinders extends in the front-rear direction of the rice transplanter; A manual lift lever is connected to the left and right hydraulic cylinders for preferentially switching the left and right hydraulic cylinders to lower the wheels at the same time.

Hereinafter, an embodiment of the present invention will be explained with reference to the drawings.
A fuselage 6 has an engine stand 4 connected to a transmission case 5 at the rear thereof, a central float 7 on the lower surface of the fuselage 6, and a pair of left and right wheels 9a.

9b shows a walking rice transplanter running in the direction of arrow A,
The rear end of the transmission case 5 is equipped with a seedling planting device 12 consisting of a seedling stand 10 and four planting mechanisms 11, as well as a pair of operating handles 13. Side float Sa.

8b, the rear end of each of these floats 7.8a, 8b is attached to the body 6, such as the handle 13, with a seedling depth opening joint lever 24 so that the height can be adjusted, and the front end of the center float 7 is It is mounted on the bottom surface of the tip of the engine stand 4 via a link 27 so as to be able to move up and down, and both sides of the flow 1-8a, 8b
The tips of the horizontal bars 31a, 31 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.

Both wheels 9a, 9b are connected to the traveling mission case 2.
The swing arms 14a and 14b are respectively attached to the tips of the swing arms 14a and 14b which are rotatably mounted at the base posts 15a and 15b, and the swing arms 14a, A hydraulic pump 18 is rotatably driven via a chino or the like in the engine 14b, 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 lift levers 19a, 19b are provided on both left and right side surfaces of the traveling mission case 2, rotatably fitted onto a shaft 20 which is supported through the traveling mission case 2, and the both lifting levers 19a.

The tips of the levers 19b are connected to the swing arms 14a and 14b via rods 21a and 21b, respectively, and the other ends of the lift levers 19a and 19b are located on both left and right sides of the engine stand 4, with axes extending in the front-rear direction. Pistons 23a of double-acting hydraulic cylinders 22a and 22b arranged as shown in FIG.
23b through connecting rods 25a, 25'b, and protruding from both sides of the engine stand 4.
a, 26b, rods 28a, 28b are connected to pins 29a, 2
Pivotally connected at 9b and its bin 29a.

The rods 28a, 28b and the hydraulic cylinders 22a, 22b are connected to springs 33a, 3 in both compression and tension directions, respectively.
Buffer mechanism 30a, 30b having 4a, 33b, 34b
The two hydraulic cylinders 22a and 22b are connected to each other so that the wheels 9a and 9b in each can be moved up and down separately and independently by the operation of both hydraulic cylinders 22a and 22b.

Further, 4-port 3-position switching valves 35a and 35b are provided on both sides of the upper surface of the left engine stand 4, and both switching valves 35a and 35b are provided.
, 35b to which the hydraulic pipe 36 from the hydraulic pump 18 is connected, and both switching valves 35a.

35b to flexible hydraulic pipes 37a, 38a, 37b.

38b to both hydraulic cylinders 22a, 22a, and spools 39a in both switching valves 35a, 35b.
, 39b are elastically related to both buffer mechanisms 302 and 30b by springs 40 a, 40 a < 40 b, and 40 b, respectively, so that when the mechanisms 30 a and 30 b are displaced forward from the neutral position, the switching occurs. The valves 35a, 35b switch so that the hydraulic pressure in the rear chamber of the hydraulic cylinders 22a, 22b is released and the hydraulic pressure enters the front chamber, and when the buffer mechanisms 30a, 30b are displaced rearward, the switching valves 35a, 35b switch to the hydraulic cylinders. 22a.

22b is configured to switch so that the hydraulic pressure in the front chamber is released and the hydraulic pressure is input into the rear chamber.

A long groove hole 41a is provided at the end of the spool 39a, 39b in both the switching valves 35a, 35b.

41b, and a rod 43 interlocked with a manual lift lever 42 provided at an appropriate location such as the dark blue handle 13 of the rice transplanter is engaged in the long slot holes 41'a, 41b, and the manual lift lever 42 is used to raise and lower both sides. Switching valve 35a.

35b can be operated preferentially.

In this configuration, while the rice transplanter is moving forward and rice transplanting work is being carried out, the rice transplanter may be moved forward and touch the field where the float touches the ground, the unevenness of the tiller where the wheels 9a and 9b touch the ground, or the seedlings 1.1o.
y) $9, Nio. 4,11e1. ″
When tilting to the left with respect to the running direction, the center of gravity moves to the left, and the supporting load on the right wheel 9b decreases, while the supporting load on the left wheel 9a increases, and the right wheel 9
b is the airframe 6 while displacing the shock absorbing mechanism 30b in the forward direction.
The left wheel 9a descends away from the buffer mechanism 3.
0a in the rearward direction and rises to approach the fuselage 6, but due to the forward change in the right shock absorbing mechanism 30b, the right switching valve 35b linked to this moves into the front chamber of the right hydraulic cylinder 22b. The right hydraulic cylinder 22b is operated to move the right wheel 9b upward to approach the fuselage 6, while the left shock absorbing mechanism 30
Left switching valve 3 that is linked to this by the rearward change of a.
5a is switched to supply hydraulic pressure to the rear chamber of the left hydraulic cylinder 22a, and the operation of the left hydraulic cylinder 22a causes the left wheel 9a to move downward away from the body 6, so that the body 6 is in a horizontal state. will be returned to.

Then, the aircraft body 6 returns to approximately horizontal position, and both left and right wheels 9a, 9b
The support loads for both buffer mechanisms 30a and '
30b returns to the same original position, both switching valves 35
a and 35b are switched to the neutral position, and the hydraulic cylinder 22a
, 22b are stopped, and the fuselage 6 is held horizontally. Also, when the fuselage 6 tilts to the right, the support load on both wheels 9'a and 9b is reduced by the operation opposite to the above. The aircraft body 6 is maintained horizontally by being controlled to be equal.

In addition, in order to turn the rice transplanter in the field, grip the upper end of the manual lift lever 42 and rotate it in the forward direction of the rice transplanter as shown in FIG.
is forcibly switched to supply hydraulic pressure to the rear chambers of the hydraulic cylinders 22a and 22b in each, and both wheels 9a and 9b simultaneously move downward, so that the machine body 6 rises significantly in the field. Furthermore, by rotating the manual lift lever 42 in the opposite direction after the rice transplanter has turned, both wheels 9a and 9b will rise simultaneously, and the machine body 6 will descend relative to the field. It is.

As described above, the present invention provides a pair of left and right hydraulic cylinders for horizontally controlling the machine body so that the axes of the hydraulic cylinders extend in the front-rear direction of the rice transplanter on both left and right sides of the engine stand located at the front of the machine body. By installing a rice transplanter with an engine stand protruding from the front of the machine, the empty space on both the left and right sides of the engine stand, which has traditionally been a dead space, can be replaced by a pair of left and right hydraulic cylinders to control the machine horizontally. Since it can be effectively used for installation, it is possible to prevent the height dimension of the middle part of the fuselage from increasing due to the installation of the hydraulic cylinder for horizontal control of the fuselage, as in the prior art described above, and to cover the upper surface of the fuselage. While the cover can be made smaller, if a spare seedling stand is provided above it, the height of the spare seedling stand can be lowered and the center of gravity of the aircraft can be prevented from becoming too high. The weight of the side hydraulic cylinders for horizontal control of the aircraft installed on both the left and right sides of the Nishijin stand acts to balance the rolling reaction force when driving both wheels. The balance weight conventionally provided on the engine stand to prevent the aircraft from tilting backwards can be reduced or omitted.

Furthermore, the present invention connects the switching valve with a manual lift lever for preferentially switching the switching valve so that the pair of left and right hydraulic cylinders simultaneously operate to lower the wheels.
By rotating this manual lift lever, the aircraft can be raised significantly by using both hydraulic seals for horizontal control of the aircraft. In other words, both hydraulic cylinders for horizontal control of the aircraft can be used to increase the Since it can also be used as a cylinder, there is no need to use three hydraulic cylinders as in the prior art.

Therefore, according to the present invention, a walking rice transplanter having the function of horizontally controlling the machine body is achieved by combining the following features: miniaturization of the cover for the machine body, miniaturization or omission of the balance weight, and reduction in the number of hydraulic cylinders. It has the effect of significantly reducing the size and weight of the aircraft, as well as reducing instability of the aircraft in the left-right direction when a spare seedling body is provided in the upper middle part of the aircraft.

[Brief explanation of drawings]

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. 2... Traveling mission case, 3... Engine, 4... Engine stand,
6... Airframe, 9a, 9b-- Wheels, 14a, 14
b-... Swing arm, 12... Seedling planting device, 1
3... Control handle, 22 a, 2. ．． 2 b
...Hydraulic cylinder, 30a, 3 (Lb...Buffer mechanism, 35a, 35b...Switching valve, 42...Manual lift lever, 43...Rondo.

Claims (1)

[Claims] (1) A pair of left and right wheels that are movable up and down on the left and right sides of the aircraft, which has an engine stand at the front and a control handle at the rear, and a hydraulic cylinder that allows the wheels to move up and down separately relative to the aircraft. A walk-behind rice transplanter comprising a pair of left and right lifting mechanisms each having a Hydraulic cylinders in the lifting mechanism are disposed on both the left and right sides of the engine stand so that the axis of the hydraulic cylinders extends in the front-rear direction of the rice transplanter, and the switching valve is connected to the left and right sides of the pair of left and right A walk-behind rice transplanter characterized in that a manual lift lever is connected to the hydraulic cylinder for preferentially switching the hydraulic cylinder to lower the wheels at the same time.