JPS6360963B2 - - Google Patents

Description

Detailed Description of the Invention The present invention provides a riding rice transplanter in which a multi-row seedling planting device is movable up and down on a traveling machine on which an operator rides, in which the wheels of the traveling machine are in contact with the ground. The present invention relates to a device that prevents the attitude of a seedling planting device relative to the field from changing due to undulations and unevenness of the tiller, and automatically controls the attitude of the seedling planting device relative to the field to be substantially constant.

Generally, the seedling planting device in a riding rice transplanter is attached to the traveling machine so that it can move up and down, but the wheel base and tread of the front and rear wheels of the traveling machine are
In order to ensure the running stability of the traveling machine, the intervals are relatively wide, so the traveling machine is likely to roll or pitch due to the undulations and uneven parts of the plowing ground on which each wheel touches the ground. Rolling and pitching propagate to the seedling planting device attached to it, and the posture of the seedling planting device relative to the field changes, making it impossible to maintain a constant planting condition of the seedlings in the field, resulting in deep planting. If the seedlings were overgrown or planted too shallow, they would produce missing plants or floating seedlings.

In the present invention, the seedling planting device is attached to the traveling machine body using a pair of left and right lower links and a pair of left and right top links so as to be vertically movable, and the inclination of the seedling planting device in the front, back, left and right with respect to the traveling machine is controlled by the pair of left and right top links. This detection signal activates both the left and right hydraulic cylinders that hold the seedling planting device.
The seedling planting device is automatically controlled to maintain a substantially constant posture in response to rolling and pitching of the traveling machine.

Next, an explanation will be given of an embodiment drawing in which the present invention is applied to a front-planting type riding-type rice transplanter. Brackets 5 and 4' protruding above and below the front end of 3 are pivoted with pins 6 and 7 on the same vertical line, respectively, to allow horizontal bending. Axle cases 8a, 8b, 9a, 9b are mounted horizontally on the surface, and swing cases 10a, 10 are rotatably mounted on the tips of each axle case.
Wheels 12a, 12 via b, 11a, 11b
b, 13a, 13b are mounted so as to be able to move up and down, and these wheels are rotationally driven by an engine 14 mounted on the rear fuselage 3. A hydraulic pump 15 driven by the engine 14 is mounted on the upper surface of the rear fuselage 3. We are prepared.

Furthermore, by rotating the handle 18 in front of the seat 17 attached to the gate-shaped frame 16 erected from the front body 2, the traveling body 1 is moved between the two bodies through the steering gear box 19, pitman arm 20, and rod 21. It is configured to be steered by adjusting the bending direction and degree of bending of 2 and 3.

Reference numeral 22 indicates a multiple seedling planting device which is mounted in front of the front body 2 so as to be movable up and down by a pair of left and right lower links 23a, 23b and a pair of left and right top link mechanisms 24a, 24b. 22 is 3
Each seedling planting unit 25 is composed of a transmission case 26, a seedling planting mechanism 21, and a float 28. A rear-tilting seedling stand 3 is mounted on the guide rail 29 mounted on the
0 is set.

On the front surface of the front body 2, an elevating shaft 33 that rotates by the movement of a piston 32 of a single-acting hydraulic cylinder 31 installed in the front body 2 is horizontally supported.
A pair of left and right lifting arms 34a and 34b protrude forward from both ends of the lifting shaft 33, and the left lifting arm 34a and the left lower link 23a are connected by a double-acting hydraulic cylinder 35a to the right lifting arm 34b.
and the right lower link 23b are connected by a single-acting hydraulic cylinder 35b, so that the seedling planting device 22 is raised and lowered by the operation of the hydraulic cylinder 31.

Further, both the top link mechanisms 24a, 24b
As shown in FIGS. 4 and 5, the seedling planting device 2
The rods 24a' and 24b' pivotally mounted on the 2 side are slidably inserted into the cylinders 24a" and 24b" pivotally mounted on the front fuselage 2 side.
a' and 24b' are connected to the cylindrical body 24 by springs 36a and 36b.
a″, 24b″ in the direction of contraction, while the cylindrical body 2
4a″, 24b″ include valve bodies 37a, 37b and spring 3.
Relief valves 39a, 39 consisting of 8a, 38b
b, and supporting pieces 40 of the springs 38a, 38b are provided.
a, 40b are brought into contact with the tips of the rods 24a', 24b', and the valve bodies 37 in the relief valves 39a, 39b are moved in proportion to the elongation of the rods 24a', 24b'.
The valve opening pressures of a and 37b are configured to be small.

The outlet 39a'' of the relief valve 39a in the left top link mechanism 24a is connected to the inlet 39a'' of the relief valve 39b in the right top link mechanism.
6b' via a conduit 41, and a relief valve 39
While connecting the outlet 39b'' of b to the oil tank 42,
Lower chamber 35 in left double-acting hydraulic cylinder 35a
a' is connected to the right hydraulic cylinder 35b via a pipe 43, and the pipe 43 and the pipe 41 are connected to the pipe 44.
Connect via.

The hydraulic line 45 from the hydraulic pump 15 includes:
A switching valve 46 is provided at an appropriate location such as on the side of the seat 17. This switching valve 46 can be set to a raised position in which hydraulic pressure is sent only to a pipe line 48 to the hydraulic cylinder 31 by operating a handle lever 47, and a relief valve 39a in a pipe line 48 to the hydraulic cylinder 31 and a relief valve 39a in the left top link mechanism 24a. A working position that simultaneously sends hydraulic pressure to the inlet 39a' and the pipe line 49 to the upper chamber 35a'' of the left side double-acting hydraulic cylinder 35a, and a neutral position that cuts off the hydraulic pressure going in and out of both pipes 48 and 49. It is configured to switch to

In this configuration, when the handle lever 47 of the switching valve 46 is operated to the up position, hydraulic pressure is sent only to the hydraulic cylinder 31, and both lifting arms 3
Since 4a and 34b rotate upward, the seedling planting device 2
2 is moved upward relative to the traveling body 1, and the switching valve 46
When the handle lever 47 is set to the neutral position, the flow of hydraulic pressure into and out of the hydraulic cylinder 31 is cut off, and the upward movement of the seedling planting device 22 is stopped at an arbitrary height.

When the handle lever 47 of the switching valve 46 is operated to the working position, the pipe line 48 to the hydraulic cylinder 31, the relief valve 39a of the left top link mechanism 24a, and the pipe line to the upper chamber 35a'' of the double-acting hydraulic cylinder 35a are connected. 49 communicate with each other,
Hydraulic pressure from a hydraulic pump 15 is sent to this. However, when the seedling planting device 22 is lifted up, tensile force acts on both top link mechanisms 24a and 24b at the same time, and the rods 24a' and 24b' are stretched and displaced, causing the set pressure to be applied to both relief valves 39a and 39b. is low, and a large amount of the hydraulic pressure from the hydraulic pump 15 is released into the oil tank 42 through both relief valves 39a, 39b, so the hydraulic pressure in the pipes 48, 49 does not become high, and the seedling planting device 22 is able to maintain its own It will fall due to weight.

Eventually, each float 28 in the seedling planting device 22
As it comes into contact with the field, both top link mechanisms 24a and 24b are compressed and displaced, and the set pressures of their respective relief valves 39a and 39b increase, causing the pipe line 4
The oil pressure at 8 and 49 gradually increases. This hydraulic pressure and the three hydraulic cylinders 31, 35a, 35b
When the load acting on the seedling planting device 22 is balanced, the seedling planting device 22 stops descending and assumes a predetermined seedling planting posture with respect to the field.

In this case, the oil pressure P ₁ in the pipes 48, 49 is:
This is the total value of the set pressure P ₀ of both relief valves 39a, 39b, and for example, in the balanced state, the set pressure P ₀ of both relief valves 39a, 39b is set to 10, respectively.
If Kg/ ^cm2 , the oil pressure in pipes 48 and 49 is
P ₁ becomes 20Kg/cm ² (2P ₀ ), and while a hydraulic pressure of 20Kg/cm ² acts on the hydraulic cylinder 31 and the upper chamber 35a'' of the double-acting oil cylinder 35a, both relief valves 39a,
The oil pressure in the pipe line 41 between 39b and 39b is half of P ₁ , or 10Kg/cm ² , and this 10Kg/cm ² oil pressure acts on the lower chamber 35a' of the double-acting hydraulic cylinder 35a and the single-acting hydraulic cylinder 35b. Double acting hydraulic cylinder 35
A and single-acting hydraulic cylinders 35b are subjected to a lifting force of 10 kg/cm ² , and hydraulic cylinder 31 is subjected to a total lifting force of 20 kg/cm ² in a balanced state.

During rice planting work with the traveling machine 1 moving forward in this balanced state, if the seedling planting device 22 tilts backward so that its upper part approaches the traveling machine due to pitching of the traveling machine 1, etc., both top springs Mechanisms 24a and 24b are simultaneously compressed and displaced, and the set pressures of both relief valves 39a and 39b are increased, and accordingly, the oil pressure of pipes 48 and 49 is also increased, and the lifting in each hydraulic cylinder 31, 35a, and 35b is increased. Since the seedling planting device 22 is lifted up, the rearward tilt of the seedling planting device is corrected. Furthermore, when the seedling planting device tilts forward so that its upper part separates from the traveling body, the set pressures of both relief valves 39a, 39b decrease due to the elongation displacement of both top link mechanisms 24a, 24b, and therefore the pipe Since the oil pressure in the passages 48 and 49 also decreases, and the lifting force in each hydraulic cylinder 31, 35a, 35b decreases, the forward tilt of the seedling planting device 22 is corrected.

When the seedling planting device 22 is tilted so that the left side approaches the traveling body with respect to the traveling direction due to rolling of the traveling body 1 during rice transplanting work, the left side top link mechanism 24a is compressed and displaced. While the set pressure of the relief valve 39a increases, the set pressure of the relief valve 39b decreases due to the expansion displacement of the right side top link mechanism 24b, and this causes the upper chamber 35a'' of the left side double-acting hydraulic cylinder 35a to Since the hydraulic pressure increases and the hydraulic pressure for the single-acting cylinder 35b on the right side decreases, the hanging force of the seedling planting device is large on the left side and small on the right side.
When the inclination of the seedling planting device is corrected and the seedling planting device 22 is tilted so that its right side approaches the traveling body 1, the set pressure of the relief valve 39a is changed due to the elongation displacement of the left top link mechanism 24a. On the other hand, the set pressure of the relief valve 39b increases due to the contraction displacement of the right side top link mechanism 24b. Then, the upper chamber 3 of the left double-acting cylinder 35a
5a'' decreases, and the double-acting cylinder 35a
Since the hydraulic pressure to the lower chamber 35a' and the right single-acting cylinder 35b increases, the lifting force of the seedling planting device is large on the right side and small on the left side, and the above-mentioned inclination of the seedling planting device is corrected.

In addition, although the above-mentioned example was a case of a front planting type in which a seedling planting device was arranged in front of the traveling machine body, the present invention is not limited to this, and a rear planting type in which a seedling planting device was arranged in the rear of the traveling machine body was used. Needless to say, this can be similarly applied to a mid-planting type in which a seedling planting device is installed in the middle of a traveling machine and a traveling machine. 23a, 23b, but may also be provided between the traveling body and the seedling planting device.

As described above, in the present invention, the seedling planting device is attached to the traveling machine body using a pair of left and right lower links and a pair of left and right telescoping top links so that the seedling planting device can be moved up and down, and the seedling planting device can be tilted forward, backward, left and right with respect to the traveling machine. is detected by the expansion and contraction of a pair of left and right top links, and this detection signal is used to appropriately operate both hydraulic cylinders that support the left and right sides of the seedling planting device. Since the attitude of the seedling planting device with respect to the field can be reliably and automatically controlled to be approximately constant for both pitching and pitching, the rolling and pitching of the traveling machine will allow the seedlings in each seedling planting row in the seedling device to It has the effect that seedlings can be planted correctly in a substantially constant state for each seedling planting row without being partially or totally planted deeply or shallowly.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a side view of a riding rice transplanter, Fig. 2 is a plan view of Fig. 1, and Fig. 3 is a side view of a riding rice transplanter.
4 is an enlarged sectional view of the left top link mechanism, and FIG. 5 is an enlarged sectional view of the right top link mechanism. 1... Traveling body, 22... Seedling planting device, 23a,
23b...Lower link, 24a, 24b...Top link, 31...Hydraulic cylinder, 34a, 3
4b... Lifting arm, 35a... Double acting hydraulic cylinder, 35b... Single acting hydraulic cylinder, 39a, 39
b...Relief valve, 15...Hydraulic pump, 46...
...Switching valve, 42...Oil tank.

Claims (1)

[Claims] 1. A multi-row seedling planting device is attached to the traveling machine on which the worker rides so that it can be moved up and down using a pair of left and right lower rings and a pair of left and right telescopic top links.
The left and right top links are each provided with relief valves whose set pressure changes as they expand and contract, while the left and right lower links or the left and right sides of the seedling planting device are equipped with relief valves for raising and lowering the seedling planting device relative to the traveling machine. A double-acting hydraulic cylinder and a single-acting hydraulic cylinder are provided, and the hydraulic pressure from the hydraulic pump is connected to the upper chamber of the double-acting hydraulic cylinder and to the relief valve inlet of the top link on the side of the double-acting hydraulic cylinder, The outlet of the relief valve is connected to the relief valve inlet of the other top link via a conduit, the relief valve outlet is connected to an oil tank, and the conduit between the two relief valves is connected to a double-acting hydraulic cylinder. 1. A riding-type rice transplanting posture control device, characterized in that a lower chamber and the single-acting hydraulic cylinder are connected.