JPH0135622Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention relates to a rice transplanter.
The soil leveling float, which is attached to the bottom of the rice transplanter frame so that it can move up and down, and the switching valve of the hydraulic system that moves the rice transplanter frame up and down are controlled so that the ground pressure that the soil leveling float receives is within a certain range that is appropriate for seedling planting work. The present invention relates to a rice transplanter that is linked by a hydraulic system so as to be held.

Conventionally, as for the interlocking structure between the hydraulic switching valve and the float, which switches the switching valve of the hydraulic system by the vertical movement of the soil leveling float, the switching operation rod of the hydraulic switching valve and the float are fixed to the float as shown in Fig. 4. The mounting bracket 18 and the operating rod ^14a were connected by a pin or the like. For this reason, when foreign objects such as mud or weeds get on the float, they get stuck in the connection between the operating rod and the float, making it impossible for the hydraulic switching valve to switch accurately.

This invention attempts to eliminate the drawbacks of the above-mentioned conventional devices. To achieve this objective, this invention took the following technical measures. That is, the rice transplanter is configured such that the lower free end side of the operating rod 14 for switching the hydraulic switching valve 12 is in contact with the upper surface of the soil leveling float 9.

One embodiment of this invention will be described in detail. Reference numeral 1 is a passenger-type towing vehicle body. 2 is the control handle, 3
is a control seat, 4 is a traveling transmission case, 5 is a propulsion wheel, and 6 is a rice transplanter frame that also serves as a transmission case.
A seedling tank 7 that reciprocates horizontally from side to side is mounted on the upper part, and a seedling planting device 8 is mounted on the rear side so as to divide and plant one seedling at a time from the seedling tank.

Reference numeral 9 denotes a soil leveling float, which is attached to the lower side of the rice transplanter frame 6 so that its front part can move up and down.

Reference numeral 10 denotes a link mechanism for connecting the towing vehicle body 1 and the rice transplanter frame 6, which is composed of an upper link 10 ^a and a lower link 10 ^b .
In contrast, the rice transplanter frame 6 is configured to be able to move up and down.

11 is a hydraulic cylinder device, which includes a piston 11 ^a
The tip of the cylinder 11b is pivotally connected to the traveling transmission case 4 side, and the base of the cylinder ^11b is pivotally connected to the upper link ^10a .
The structure is such that the piston moves upward and moves downward when the piston is retracted.

Reference numeral 12 denotes a hydraulic switching valve, in which a valve body 12 ^b is provided in a valve case 12 ^a so as to be able to switch freely;
2 ^a is attached to the lower link 10 ^b ,
The valve ports provided in the valve case ^12a include a first port communicating with the base side chamber of the hydraulic cylinder ^11b , a second port communicating with the tip side chamber, a third port communicating with the hydraulic pump 13, and a hydraulic tank (Fig. The valve body ^12b is provided so that the communication state of each of the ports can be switched,
An operating rod 14 is integrally attached to this valve body.

The operating rod 14 is oriented downward and is configured to come into contact with the upper surface of the earth leveling float 9. Reference numeral 15 denotes a spring that presses the operating rod 14 against the upper surface of the earth leveling float 9.

Reference numeral 16 denotes an operating lever, which is provided near the cockpit and is provided so as to be able to pull the float 9 upward via a wire 17.

To explain the operation of the above example in detail, when each rotating part is operated while pulling the rice transplanter frame 1 with the towing vehicle body 1, the soil leveling float 9 is propelled to touch the surface of the topsoil of the field, and is placed in the seedling tank 7. The seedlings to be placed are divided one by one by the seedling planting device 8,
It is planted in the area leveled by float 9.

During the seedling planting process,
As the depth of the field increases, the ground pressure of the soil leveling float 9 increases, and the soil leveling float 9 is pushed up toward the machine frame 1. Then, the operating rod 14 of the hydraulic switching valve 12 that is in contact with the top surface of the soil leveling float is pushed up, the valve body ^12b is switched to the state shown in FIG. 2, and the oil from the hydraulic pump 13 is transferred to the hydraulic cylinder ^12a. communicated with the first port of
Further, the second porthole and the fifth porthole communicating with the tank are communicated with each other, so that the hydraulic piston 11
^a protrudes and raises the rice transplanter frame 1. When the ground pressure of the soil leveling float 9 suitable for seedling planting work is reached, the third port ^C , which communicates with the hydraulic pump 13, and the fourth and fifth ports N and E to the tank are closed by the valve body 12b. and enters the neutral state. Next, when the field becomes shallow, the leveling float 9 moves downward, so the operating rod 14 is pushed down by the spring 15, the valve body ^12b becomes the state shown in FIG. 3, and the hydraulic piston ^11a moves into the cylinder ^11b . Pull inward.
Therefore, the rice transplanter frame 1 descends and returns to the neutral state where the height is controlled to be appropriate.

In this way, the rice transplanter frame 1 is always maintained so that the ground pressure of the soil leveling float 9 is in an appropriate state for planting seedlings.
is automatically controlled to raise and lower.

Since the hydraulic switching valve 12 is switched by the operating rod 14 that is in contact with the upper surface of the soil leveling float 9, even if mud, weeds, or other foreign matter gets on the upper surface of the float 9, the hydraulic switching valve 12 is switched by the operating rod 14. There will be no entanglement, and the movement of the operating rod 14 will be accurate, resulting in reliable control.

In addition, even if long pieces of straw or weeds become entangled, they can be removed quickly and easily, and cleaning after planting seedlings is also easy.

As described above, since this device has the above-mentioned structure, it is difficult for mud, weeds, straw debris, etc. that climbs on the soil leveling float to get entangled with the operating rod that switches the hydraulic switching valve, and the switching valve can be operated accurately, ensuring reliable control. In addition, even if the operating rod becomes tangled with weeds or straw waste, the tangled foreign matter can be easily removed by pushing up the operating rod and separating the soil leveling float from the operating rod. This has the effect of making it easier to remove mud adhering to the top surface of the float after work.

[Brief explanation of the drawing]

The figures show one embodiment of this invention; Fig. 1 is a side view when the rice transplanter frame is attached to the towing vehicle body;
3 and 3 are partially sectional side views of the main parts showing the operating state, and FIG. 4 is a side view showing the main parts of the conventional structure. Symbols in the figure: 6 is the rice transplanter frame, 9 is the soil leveling float,
11 is a hydraulic cylinder device, 12 is a hydraulic switching valve,
14 indicates an operating rod.

Claims (1)

[Scope of utility model registration request] The soil leveling float, which is attached to the bottom of the rice transplanter frame so that it can move up and down, and the switching valve of the hydraulic system that moves the rice transplanter frame up and down are controlled so that the ground pressure that the soil leveling float receives is within a certain range that is appropriate for seedling planting work. If the float is too close to the rice transplanter frame, the rice transplanter frame will be raised, and if it is too far away, the rice transplanter frame will be lowered. A rice transplanter that comes in contact with the upper side of a float.