JPH0260288B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lifting control device for a rice field agricultural machine, and has conventionally been applied to a running vehicle body equipped with a transmission device whose running speed can be changed by appropriate means such as throttle operation or change operation. , a ground pressure sensor that touches the soil surface and moves up and down, and a hydraulic system that moves the wheels of the vehicle up and down;
Alternatively, an agricultural machine that can be directly moved up and down via a vertical movement link is attached, and the switching valve of the hydraulic system is switched in response to changes in the ground pressure of the sensor, so that the agricultural machine can be substantially moved up and down. It is well known that the ground pressure of the sensor is always maintained within an appropriate range. In addition, the standard setting pressure of the sensor has already been adjusted according to the hardness or softness of the soil surface, and the sensitivity has been adjusted to an appropriate level during work.

However, the ground pressure sensor has a large levitation force when working at high speeds due to the muddy soil of paddy fields, and conversely, the levitation force decreases when working at low speeds. Even if the sensitivity is adjusted to the appropriate level with consideration given to the The problem was that I couldn't do any work. In other words, in the case of rice transplanters, floating seedlings may occur,
On the other hand, the seedlings tend to be planted too deep, and seeding machines have the disadvantage of not keeping the seeding depth constant, resulting in uneven germination.

This invention has taken the following technical measures for the purpose of solving the above-mentioned drawbacks.

That is, the rice field is provided with a sensitivity changing device 43 that adjusts the ground pressure sensitivity of the sensing body 25, and the transmission of the traveling vehicle body 1 and the sensitivity changing device 43 are interlocked and connected so that the sensitivity is made insensitive at high speeds and sensitive at low speeds. It was used as a lifting control device for agricultural machinery.

One embodiment of the present invention will be described in detail based on the drawings. 1 is a passenger-type traveling vehicle body, an engine stand 3 is attached to the front part of a traveling gear box 2, and a prime mover (not shown) is mounted on the upper part of the engine stand 3. , the base of the chain case 4 is fixed to the left and right sides of the traveling gear box 2 so as to face rearward and downward, and the rear wheels 5 are attached to the rear end.
5 is supported on the shaft. Front wheels 6, 6 are attached to the lower portions of the left and right sides of the engine stand 3. 7 is a bonnet that covers the engine. 8 is a control handle, 9 is a main clutch pedal, and 10 is a throttle lever. Reference numeral 11 denotes a speed change lever, which is interlocked with the speed change device in the traveling gear box 2. This speed change lever 11 can be operated in an H-shape in plan view, and when operated in the A part of the H-shaped guide groove 12 in FIG. It is provided so that the speed can be changed to a low working speed, a high working speed when operated in the A part, a road traveling speed when operated in the C part, and a reverse speed in the D part.

Reference numeral 13 denotes a pilot seat, which in rear view connects the left and right chain cases 4, 4 with a formwork 14, and is supported on the upper part of the formwork 14.

15 is a hydraulic control lever, and 16 is a planting clutch lever. 17 is a step stand.

A reinforcing pipe 18 is a reinforcing body that connects the left and right chain cases 4, 4.

Reference numeral 19 denotes a protruding frame, the base of which is fixed to the reinforcing pipe 18.

Reference numeral 20 denotes an agricultural machine, and although a rice transplanter is used as an example in the illustrated example, it may be a commonly known seeding machine. The rice transplanter shown in the figure has a seedling tank 22 that supports a seedling tank 22 that moves horizontally and reciprocally left and right on the top of a planting gear box 21, and a seedling planting rod that divides and plants seedlings one by one from the seedling tank 22 at the rear. 23 is attached, and the rear part is pivoted to the planting gear box 21 at the lower left and right center 24, and the front part is freely movable up and down.
5 (center float), and side floats 26, 26 are attached to both left and right sides of this float in the same way as the center float 25.

As shown in FIGS. 4 and 5, the mounting structure of the front part of the central float 25 is a dogleg-shaped link 28 that can be freely connected to a support frame 27 that protrudes from the front part of the planting gear box 21. A link rod 28a pivotally attached to the support frame 27 side extends upward.

Reference numeral 29 denotes an elevating link, in which the bases of the upper link 30 and lower link 31 are pivotally connected to the protruding frame 19, the rear parts of both links 30 and 31 are pivotally connected by a joint link 32, and a rolling connector is attached to this joint link 32. The planting gear box 21 of the rice transplanter is attached via 33.

Reference numeral 34 denotes a hydraulic system, in which the base of a hydraulic cylinder 35 is pivotally connected to the traveling gear box 2, a hydraulic piston 36 is attached to an arm 37 that is integrally attached to the upper link 30, and when the piston 36 protrudes, the upper link 30 is shaken. The rice transplanter 20 is configured to be lifted up.

Reference numeral 38 designates a hydraulic switching valve, in which a case 38a is pivotally connected to the support frame 27 with a pin 39, and a switching rod 38b is pivotally connected to the central float 25, and the hydraulic circuit shown in FIG. 34 hydraulic pistons are provided so as to be moved in and out. In the circuit shown in FIG. 5, 40 is a pump, 41 is a tank, and 42 is a relief valve.

That is, when the central float 25 moves upward from a height appropriate for planting seedlings, the valve 38 is switched so that the piston 36 protrudes, and when the central float 25 moves downward, the piston 36 retracts.

43 is a sensitivity changing device, which is connected to the dogleg-shaped link 28;
A spring 4 is attached to the extension part 28b of the link rod 28a.
4, the spring 44 is interlocked with the rotating lever 45 by intervening between the A to B portions of the H-shaped guide groove 12 of the gear shift lever 11, and when the wire 46 is pulled, the spring 44 4
When the tension of the center float 25 becomes strong, the center float 25 is strongly pushed down onto the soil surface, and when it is loosened, the center float 25 is pushed down weakly onto the soil surface. That is, when the tension of the spring 44 is made strong, a strong upward force is required to move the switching rod 38b of the valve 38 upward to make the switch, and the sensitivity becomes dull, and when the tension is made weak, the sensitivity becomes sensitive. 47
is a pivot shaft of the lever 45.

The lever 45 is interposed between A and B of the H-shaped guide groove 12 as shown in FIG. It is set to rotate to pull the wire 46 and increase the tension of the spring 44.

Next, the operation of the above example will be explained in detail. First, seedlings are placed in the seedling tank 22, and when the traveling vehicle body 1 is driven and rotated by transmission, the rice transplanter 20 moves the center float 25 and the side floats 26, 26. While being towed while floating on the soil surface, the seedling planting rod 23
Seedlings are separated one by one from a seedling tank 22 which moves back and forth horizontally from side to side and are planted on the leveled soil surface. When the traveling vehicle body 1 sinks deeply or rises from the soil surface due to the unevenness of the tiller,
The ground pressure of the center float 25 and side floats 26, 26 of the rice transplanter 20 increases and decreases. Then, when the ground pressure increases and the central float 25 moves upward significantly, the hydraulic switching valve 38 is switched to cause the piston 36 to protrude, and the rice transplanter 20 is moved upward by the elevating link 29. And center float 2
When the ground pressure of No. 5 becomes appropriate, the hydraulic pressure switching valve 38 is returned to the neutral position.

Conversely, the ground pressure decreases and the center float 2
5 moves down significantly, the hydraulic switching valve 38 is switched so that the piston 36 can be retracted, and the rice transplanter 20 is moved down due to its weight, and when the ground pressure becomes appropriate, the hydraulic switching valve 38 is returned to neutral. In this way, the rice transplanter 20 is automatically controlled to move up and down and is towed while planting seedlings.

However, when planting seedlings, the work speed is high when the field is shallow or when the driver is an experienced driver. Conversely, when the field is deep or the driver is inexperienced, work at low speeds. At this time, when working at high speed, the front part of the center float 25 tends to float due to the muddy soil, which tends to cause floating seedlings when planting seedlings. However, in this embodiment of the present invention, the shift lever 11 is moved to the high speed side When the lever 45 is operated to the b) position,
is operated to the state shown by the imaginary line in Fig. 3, and the wire 46 is
The tension of spring 44 is increased via . Therefore, the upward movement resistance of the central float 25 is increased, preventing the float 25 from moving upward unnecessarily, and the generation of floating seedlings is prevented.

Conversely, when the gear shift lever 11 is operated to the low speed side (A), the tension of the spring 44 is weakened via the lever 45 and the wire 46, and the upward and downward resistance of the central float 25 is reduced, causing the vehicle to run unnecessarily. It runs smoothly without any resistance, and precise lifting and lowering control is performed without mud pushing.

In addition, although the example explained the case where the rice transplanter is a working machine, the same applies to the case where it is a seeding machine. In the case of a seeding machine, seeds are sown shallowly under the soil surface during high-speed operation, and seeds are sown shallowly under the soil surface during low-speed operation. The seeds tend to be sown deeply, but according to the implementation of this invention, the seeds can be sown at a constant depth.

Further, in the embodiment, the tension of the spring 44 for sensitivity adjustment is changed by the speed change lever 11, but as shown in FIG. The sensitivity may be set to be insensitive when working at high speeds and to be sensitive when working at low speeds. Furthermore,
Apart from the embodiments, it is of course possible to use a type in which the running wheels are raised and lowered by a hydraulic device, such as in a walking rice transplanter.

As described above, since the present invention has the above-mentioned configuration, it is possible to solve the conventional drawback that the work is performed with a tendency to rise or sink due to the speed change between high-speed work and low-speed work. At any working speed, the working machine can be accurately controlled to raise and lower to perform accurate work.

*Figure The figure shows one embodiment of this invention.
Figure 1 is a side view, Figure 2 is a plan view, Figure 3 is a plan view of the main part, Figure 4 is a side view of the main part, and Figure 5 is the
6 is a hydraulic circuit diagram, and FIG. 7 is a simplified side view of another example.

Symbols in the figure: 1 is the running vehicle body, 11 is the gear shift lever,
20 is an agricultural machine (rice transplanter), 25 is a ground pressure sensor (center float), 34 is a hydraulic system, and 43 is a sensitivity change device.

Claims (1)

[Claims] 1. A rice transplanter or seeding machine that is substantially raised and lowered by a hydraulic device and a ground pressure sensing body that is grounded on the soil surface and can move up and down, on a running vehicle body equipped with a transmission that is changed in speed by an appropriate means and runs. When the ground pressure of the sensing body changes higher than a certain pressure, lower the running wheels or directly raise the agricultural machine to reduce the ground pressure, so that the ground pressure becomes lower than the certain pressure. In the device for increasing the ground pressure by raising the running wheels or lowering the agricultural machine when the ground pressure changes, and maintaining the ground pressure at an appropriate constant pressure, a sensitivity changing device is provided for adjusting the ground pressure sensitivity of the sensing body, and the above-mentioned This lifting control device for a paddy field agricultural machine is constructed by interlocking and connecting a transmission device of a traveling vehicle body and a sensitivity changing device so that the sensitivity becomes insensitive when operating at high speed and becomes sensitive when operating at low speed.