JP2561628B2 - Rice transplanter hydraulic system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic apparatus for a rice transplanter in which a planting section is controlled to move up and down via a hydraulic cylinder so that the planting section is maintained horizontally with respect to a rice field.

[0002]

2. Description of the Related Art Conventionally, a double-acting one-sided rod has been widely used as a hydraulic device for horizontally controlling such a planting portion (for example, Japanese Patent Laid-Open No. 52-131823).

[0003]

However, in the case of using the hydraulic cylinder as described above, the piston rod is protruded.
The volume of the hydraulic cylinder chamber on the opposite side
Is it smaller than the chamber by the volume of the piston rod?
Et al., That the discharge amount of the hydraulic pump is kept substantially constant
Depending on the moving direction of the piston rod in the hydraulic cylinder
There is a drawback that the moving speed of the piston rod is different and the forward and backward movement of the hydraulic cylinder becomes unequal speed .

[0004]

SUMMARY OF THE INVENTION Therefore, according to the present invention, there is provided a fixed body for connecting the piston rod and the cylinder body of the double-acting double-sided rod hydraulic cylinder to the rice transplanter side, and a movable body for changing the posture of the planting section. Between the movable body and the movable body for changing the posture of the planting part, the reciprocating speed of the hydraulic cylinder is substantially constant, the cylinder is connected to the movable body, and both ends of the piston rod are fixed bodies. When the posture of the planting part is changed by the cylinder, the movable body can be reciprocated without any time lag, and a stable posture changing operation of the planting part without hunting can be performed to achieve the planting depth. While the planting work can be carried out with a substantially constant value, and the operating speed of the piston rod, etc. can be easily set, both ends of the piston rod are fixed to a fixed body, so the mounting strength of the cylinder can be increased. Largely obtained easily and in which by reducing entanglement between the cylinder and the piston rod may stable well operating support cylinder.

[0005]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 is an explanatory plan view showing a main part, FIG. 2 is an overall side view of the rice transplanter, and FIG. 3 is a plan view thereof. In the figure, (1) is an engine, (2) is a mission case, and (3) is Planted transmission case, (4) planted drive case, (5) paddy wheels supported on both sides of the mission case (2) via swing cases (6), (7) engine (1) and each case (2) A float for supporting the airframe composed of (3) and (4) via a support link (8) and a cushioning member (9), (10)
Is a steering handle which is continuously provided at the rear end of the drive case (4),
(11) is provided along the drive case (4) and the upper part of the handle (10) through the guide members (12) and (13), and is reciprocally moved left and right. 1
4) is a planting claw that is mounted on the drive case (4) via a planting arm (15) to take out one plant of seedling from the seedling mount (11) and plant it, (16) (16) is the engine (1)
A pair of left and right float-like rolling sensors which are swingably supported by a sensor arm (18) on an engine base frame (17) on which is mounted, and (19) is a pitching sensor provided on the upper surface of the float (7). Rolls (20) and (20) for supporting height detection are side floats arranged on both right and left sides of the rear end portion of the float (7) as required, and the seedling mount (11) reciprocating when the machine is running.
The seedlings are taken out one by one by the planting claws (14) and sequentially planted in the field.

As shown in FIG. 1, the left and right swing cases (6) and (6) are connected to the piston rod (22) of the pitching control hydraulic cylinder (21) fixedly installed on the upper side of the mission case (2). The swing plate (25), which is a movable body, is connected to a fixed plate (23), which is a fixed body fixed to the tip of the piston rod (22), via a pivot (24), and these plates (23)
A rolling control hydraulic cylinder (26) and piston rods (27a) (27b) are interposed between (25), and swing arms (28) (28) are integrally connected to the swing cases (6) (6). Swing rod (29) (2
9), the left and right ends of the swing plate 25 are connected to each other, and the wheels 5 and 5 are simultaneously moved up and down by the expansion and contraction of the piston rod 22. While adjusting the support height of the machine, the left and right support heights of the machine by the left and right wheels (5) and (5) are made different by the expansion and contraction of the piston rods (27a) and (27b) to tilt the machine to the left and right. It is configured to adjust.

Further, a hydraulic cylinder for pitching control (2
A hydraulic switching valve (30) for controlling the operation of (1) is provided on one side of the transmission case (3), and the switching valve (30) is connected to the pitching sensor (19). The base end of the arm (19a) is swingably supported on a pivot shaft (31), and a swing plate (32) integrally connected to the arm (19a) is connected to the swing valve (32) via a rod (33) to form the switching valve ( 30) switching arm (3
4) is connected to the sensor (1) by the change of the vertical inclination of the float (7) front part based on the change of the support height of the airframe.
The switching valve (30) is operated via 9).

In addition, the rolling control hydraulic cylinder (2
A rotary hydraulic switching valve (35) for controlling the operation of (6) is fixedly mounted on the fixed mounting plate (36) of the base frame (17), and the left and right rollings are provided on the switching shaft (37) of the switching valve (35). When the middle of the sensor arm (18) that integrally connects the sensors (16) and (16) is fixedly supported, and the relative positional relationship with the rolling sensor (16) changes due to the lateral tilt of the machine body. The switching valve (35) is configured to be operated.

The rolling control hydraulic cylinder (26) is a double-acting double-sided piston rod (27a).
(27b), the pivot (41) in the middle of the body of the cylinder (26) is swingably supported in the long hole of the swing plate (25), and the cylinder (2)
6) Both ends of the piston rods (27a) and (27b) are fixed plates (42) at the ends of the piston rod (22).
The fixing brackets (42a) (42b) fixed to the cylinder (2) are connected via the pivots (43) (43).
When the hydraulic pressure is supplied to 6) and the piston rod (27a) or (27b) is expanded, the cylinder (2)
6) and the swing plate (25) are changed in relative position to perform rolling control. The piston rod (27a) of the double-acting double-sided rod hydraulic cylinder (26).
(27b) and the main body of the cylinder (26) are interposed between a fixed plate (23) for connecting to the rice transplanter side and a swing plate (25) for changing the posture of the planting section, and the posture changing operation of the planting section. The reciprocating motion speed of the swing plate (25) by the hydraulic cylinder (26) is made substantially constant, and the cylinder (26) is connected to the swing plate (25) to make the piston rod (27a).
(27b) Both ends are fixed to the fixing plate (23).

This embodiment is configured as described above, and each sensor (16) is used when the height of the planted rice field with respect to the machine body changes due to unevenness of the cultivator during rice transplanting work.
(19) changes in proportion to this, and the switching valve (30)
(35) is appropriately switched, and when the front surface of the float (7) swings up and down as the ground pressure changes as the height of the planted rice field changes, the pitching sensor (1
7) detects this, the hydraulic cylinder (18) is expanded and contracted through the switching valve (30), and both wheels (5) are moved.
The adjustment of the support height according to (5) is performed at the same time. on the other hand,
Rolling sensor (16) depending on the tilt of the aircraft
When the height change of the planted paddy field is detected, the hydraulic cylinder (26) is expanded and contracted through the switching valve (35) to adjust the left and right body support heights of both wheels (5) and (5) to different states. As a result, the aircraft is maintained horizontally with respect to the planted rice field.

During such work, when the rolling control is performed, the cylinder volume conditions on both sides of the piston (27) in the cylinder (26) are the same, so that the discharge amount of the hydraulic pump is constant. At this time, the operation speed of the piston rods (27a) (27b) when expanding and contracting becomes constant, and smooth control can be performed.
For example, it is possible to eliminate the disadvantage that the hunting and the like occur due to the difference in the time required for the return when the body tilts to the right and the tilt to the left as in the conventional case.

[0012]

As is apparent from the above embodiments, the present invention connects the piston rods (27a) (27b) of the double-acting double-sided rod hydraulic cylinder (26) and the cylinder (26) body to the rice transplanter body side. Reciprocating motion of the movable body (25) by the hydraulic cylinder (26) interposed between the fixed body (23) and the movable body (25) for changing the posture of the planting part to perform the posture changing operation of the planting part. While making the speed almost constant,
The cylinder (26) is connected to a movable body (25), and both ends of the piston rods (27a) (27b) are fixed to a fixed body (23). In the case of changing, the reciprocating operation of the movable body (25) can be performed without a time lag, and a stable operation of changing the posture of the planting part without hunting or the like can be performed to perform planting work in which the planting depth is substantially constant. While being able to
While the operating speed of the piston rods (27a) (27b) can be easily set, the piston rods (27a) (2
7b) Since both ends are fixed to the fixed body (23), the mounting strength of the cylinder (26) can be easily increased, and the cylinder (26) and the piston rod (27a) can be easily attached.
It is possible to reduce the twist between the (27b) and stably operate and support the cylinder (26).

[Brief description of drawings]

FIG. 1 is an explanatory plan view showing a main part.

FIG. 2 is an overall side view.

FIG. 3 is a plan view of the same.

[Explanation of symbols]

 (23) Fixed plate (fixed body) (25) Swing plate (movable body) (26) Hydraulic cylinder (27a) (27b) Piston rod

Claims (1)

(57) [Claims] 1. A double-acting double-sided rod hydraulic cylinder (26)
Piston rod (27a) (27b) and cylinder (2
6) Fixed body (23) for connecting the main body to the rice transplanter side
And the movable body (25) for changing the posture of the planting part, and the reciprocating speed of the movable body (25) for changing the posture of the planting part by the hydraulic cylinder (26) is made substantially constant. At the same time, the cylinder (26) is connected to the movable body (25), and both end sides of the piston rods (27a) (27b) are fixed to the fixed body (23).