JPS6355884B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a land leveling device for a rice transplanter for leveling rice fields such as headlands during turning.

[Conventional technology]

Generally, when the rice transplanter approaches a headland and is about to move around, the planting lever is set to the "off" position to disengage the planting clutch, and then the planting part is raised by a hydraulic cylinder. I try to do that.

[Problems to be solved by the invention]

Therefore, when turning, the planting area is raised by raising the float and switching the hydraulic valve, which causes the problem that the float rises before the planting area rises, resulting in poor ground leveling performance. Set the planting clutch on the attachment part to the ``disengaged'' position and run along the ridge with the planting part lowered, allowing the float to move up freely even when erasing wheel marks during planting turns. However, there was also the problem that wheel marks could not be completely removed.

[Means to solve the problem]

In view of this, the present invention provides a hydraulic control valve on the float that supports the planting section to operate a hydraulic cylinder by switching in accordance with the vertical movement of the float to move the planting section up and down, A braking mechanism for regulating the vertical movement of the float is linked to the operation of a planting lever that turns on and off the planting clutch, and when the planting lever is operated to the "off" position, the braking mechanism It is characterized in that it operates so as to brake the motor to a lower position.

[Effect]

By having the above structure, the present invention can level the headland by turning the planting lever into the "off" position when turning the headland, and the float comes into contact with the rice field while its vertical movement is braked.

【Example】

Embodiments of the present invention will be described below with reference to FIGS. 1 to 5. In FIG. 1, an engine section 2 is mounted on the front part of a towing vehicle body 1, a front wheel 3 is formed below the engine section 2, and a driver's seat 4 is formed in the center of the vehicle body 1. The driver's seat 4 has a handle 5, pedals 6, a seat 7, etc., and a chain case 8 extends rearward from the center of the lower part of the vehicle body, and a wheel 9 is attached to the rear end. A planting part 11 is attached to the rear part of the towing vehicle body 1 via a link mechanism 10 so as to be movable up and down, and the link mechanism 10 is moved up and down by expansion and contraction of a hydraulic cylinder 12. The planting section 11 includes a planting section frame 13, a float 14 that supports the frame 13, a planting body 15 attached to the rear of the frame 13, a seedling tank 16 for placing planted seedlings, and the like. are doing. A support frame 17 is provided at the front of the planting section frame 13.
is attached rotatably around a shaft 17a, and a first link 18 is attached diagonally rearward from the center of the support frame 17.
extends, and the lower end of the first link 18 is pivotally connected to the center of the second link 19 by a shaft 20. The lower end of the second link 19 is attached to a mounting ear 21 fixed on the float 14, and the second link 19
As shown in FIGS. 2 and 3, the upper end of the spring frame 9 is fixed to a pin 23 that is slidably mounted in an elongated hole 22a at the rear end of a spring frame 22 serving as a braking mechanism. Further, the rear end of a float presser spring 24 is locked to this pin 23, and the front end of this spring 24 is connected to a wire 2 at the front end of the spring frame 22.
It is connected to 5. As shown in FIG. 1, this wire 25 is connected via a guide fitting 27 and an arc-shaped member 28 to a planting lever 26 for turning on and off the planting clutch so as to be interlocked therewith. A hydraulic control valve 29 is attached to the side of the support frame 17, and the lower end of a spool shaft 30 extending below the control valve 29 is attached to the attachment ear 21 with a attachment fitting 31. Moreover, the hydraulic control valve 29 is
It is designed to be switched by an operation lever separately provided on the vehicle body 1 side, and the planting section 11 is raised and lowered via a link mechanism 10. A lever 32 is fixed to the shaft 17a that supports the support frame 17, and a connecting rod 3 is attached to the lower end of the lever 32.
3. A known planting depth adjustment mechanism consisting of levers 34, 35, etc. is connected. The hydraulic control valve 29 is a 4-port, 3-position switching valve as shown in FIGS. 4 and 5, and includes a casing 36 and a spool shaft 30 that moves up and down within the casing 36.
It has a bellows 37 that covers the lower part of the spool shaft 30, and inside the casing 36 there are a communication hole 39 connected to the hydraulic pump 38, a communication hole 40 connected to the hydraulic cylinder 12, and a communication hole 4 connected to the oil tank 41.
2nd class has been formed. Note that the hydraulic pump 38 sucks up oil in the oil tank 41 via a filter 43, and a relief valve 45 is provided in an oil passage 44 that communicates between the intermediate portion of the pump 38 and the hydraulic control valve 29 and the oil tank 41. It is provided. Next, the effect will be explained. During planting work, the float 14 moves up and down by bending and stretching the links 18 and 19 around the depth set by the planting depth adjustment mechanism, and when the planting section frame 13 moves up and the float 14 descends. is spool shaft 3
0 descends, the hydraulic control valve 29 is switched, the hydraulic cylinder 12 is contracted, and the planting part 11 is lowered via the link mechanism 10, and when the float 14 is raised, it operates in the opposite manner to the above, and the float 14 at the set depth. Then, when the rice transplanter approaches the ridge and is about to start turning, the planting lever 26 is pushed back to disengage the planting clutch. In conjunction with this, the wire 25 pulls the float presser spring 24 of the locking mechanism. Therefore, the second link 19 rotates counterclockwise about the shaft 20, pushes down the float 14, brings the links 18 and 19 into the setting range of the planting depth adjustment device, and moves the float 14 upward. to regulate movement. Due to the lowering of the float 14, the hydraulic control valve 1
The spool shaft 30 of 9 is also lowered, and the planting part 11 is lowered by switching the valve. Therefore, float 1
4 is pressed downward with its vertical movement locked, and the rice fields dug up by the wheels are leveled uniformly. When the aircraft rotates,
Operate the operating lever provided on the side to open the hydraulic control valve 29.
, the planting section 11 is lifted up via the link mechanism 10, and the planting section 11, which has completed its rotation, is lowered.
At this point in time, the float 14 is in a braking state until the planting lever 26 is turned on, and when the headland is leveled in this state and the planting lever 26 is turned on, the float 14 is in a braking state. will be resolved and normal planting work will be carried out. Also, at the edge of the ridge, the planting clutch of the planting section 11 is set to the "disengaged" state, and the planting section 11 is run along the ridge while being lowered, thereby erasing the wheel marks during planting turns. You can also work. At this time, since the float 14 can freely move upward, wheel marks can be surely erased.

【Effect of the invention】

As explained above, the present invention provides hydraulic pressure for moving the planting part 11 up and down by switching the hydraulic cylinder 12 on the float 14 that supports the planting part 11 according to the vertical movement of the float 14. Control valve 2
9 was provided, and a braking mechanism for regulating the vertical movement of this float 14 was linked to the operation of a planting lever 26 that turns on and off the planting clutch, and this planting lever 26 was operated to the "off" position. Since the braking mechanism operates to brake the float 14 to the lower position, when the rice transplanter turns, when the planting clutch is turned off, the movement of the float 14 is automatically braked to level the land. Improved performance and better ground condition at the start of a turn. In addition, wheel marks near the ridge can also be leveled.

[Brief explanation of the drawing]

Figure 1 is a side view of the riding type rice transplanter of the present invention, Figure 2 is a side view of the riding type rice transplanter of the present invention;
The figure is a side view of the front part of the planting part, FIG. 3 is a view taken in the direction of arrow A in FIG. 2, FIG. 4 is a hydraulic circuit diagram, and FIG. 5 is a longitudinal sectional view of a hydraulic control valve. 1... Traction vehicle body, 10... Link mechanism, 11...
... Planting part, 12 ... Hydraulic cylinder, 13 ... Frame, 14 ... Float, 17 ... Support frame, 18
...First link, 19...Second link, 22...
Spring frame, 23...pin, 24...spring, 2
5... Wire, 26... Planting lever, 29... Hydraulic control valve, 30... Spool shaft.

Claims (1)

[Claims] 1. A hydraulic control valve is provided on the float that supports the planting section to operate a hydraulic cylinder that switches according to the vertical movement of the float to move the planting section up and down, and regulates the vertical movement of this float. The braking mechanism for this purpose is linked to the operation of the planting lever, which turns the planting clutch on and off.
1. A soil leveling device for a rice transplanter, wherein the braking mechanism operates to brake the float to a lower position when the float is operated to the lower position.