JPS6360965B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a riding-type rice transplanter, and in recent years, there has been a demand for larger-sized riding-type rice transplanters as well. In this case, in order to level the soil at the seedling planting position, the soil leveling float must be divided into several pieces and placed at a predetermined interval, and a muddy water passage section must be configured between the leveling floats. This has the disadvantage that pushing occurs and the running resistance becomes large. Therefore, conventionally, as a rice transplanter with an even number of seedling planting rows, a soil leveling float was used to level the soil at two seedling planting positions each, or
Alternatively, in the case of an odd number of seedling planting rows (5-row rice transplanter), a central soil leveling float is installed to level one seedling planting position in the center, and two seedling planting positions are leveled on the left and right sides. A local ground leveling float was installed.

However, in the case of a riding rice transplanter, the rice transplanting device is installed at the rear of the towing vehicle body so that the ground pressure of the soil leveling float is always constant, and this ground pressure is detected by the central soil leveling float located at the center of the left and right. Otherwise, there is a drawback that erroneous detection may occur due to horizontal movement of the seedling tank.

However, if the central soil leveling float is changed to a float with a narrow left and right width for leveling one seedling planting position like the 5-row rice transplanter mentioned above, it will sink into the ground when the soil surface is soft, making it difficult to detect ground pressure. However, it is inappropriate to use narrow soil leveling floats that level the ground at only one seedling planting position for ground pressure detection. Therefore, conventional large-sized riding rice transplanters that plant odd number rows, such as those that plant 5 rows and 7 rows, have drawbacks in soft fields.

The object of the present invention is to create a large-sized rice transplanter for planting in odd rows, which eliminates all the drawbacks of the above-mentioned riding-type rice transplanters for planting in 5 rows and 7 rows.

Based on an embodiment of this invention shown in the drawings,
First, its configuration will be explained in detail.

Reference numeral 1 denotes a towing vehicle body, in which a prime mover covered by a bonnet 5 is mounted on the front part of a chassis 4 having front wheels 2 and rear wheels 3, a control seat 6 is provided at the rear, and a handle is provided in front of the control seat 6. 7 and various control sticks are provided. 8 indicates a step, and 9 indicates a mission case.

Reference numeral 10 denotes a rice transplanting device, in which a transmission case 11 that also serves as a frame is connected to a parallel link mechanism 1 from the towing vehicle body 1 side.
The transmission case 1 is connected so as to be movable up and down through the transmission case 2.
1 is equipped with a seedling tank 13 that reciprocates horizontally from side to side, and a seedling planting rod 14 that engages one seedling at a time from this seedling tank 13 and propagates it to the soil surface below.

The transmission case 11 includes a main transmission case 11a in the left and right center portions that houses main transmission parts such as a lateral movement mechanism and a clutch mechanism for the seedling tank 13, and a lateral transmission case 11a that protrudes to both left and right sides of the main transmission case 11a. Cases 11b and 11c, and further horizontal cases 11b and 11
Four rear cases 11d and 11 protrude rearward from c.
It consists of e, 11f, and 11g.

One or two seedling planting rods 14 are attached to the rear case, and a total of seven seedling planting rods 14 are arranged at regular intervals in the left and right direction, and the swinging arm and crank are used to control the seedling planting rods 14 in the vertical direction. It is provided so that it can be moved in a sliding motion.

15 shows the frame after installing the grading float.

Reference numeral 16 denotes a central soil leveling float, which is widely provided on the left and right so that the seedling planting position can be leveled by the three seedling planting rods located in the center of the seven seedling planting rods 14, and the rear Lateral pins 17a are attached to the rear case 11f and the rear frame 15, respectively.
17b, and the front part is attached to the expansion ring 18a.
The center leveling float 16 is attached to a protruding rod 19 protruding from the front part of the transmission case 11, and the front part of the central ground leveling float 16 is mounted so that it can swing up and down.

20a and 20b are side floats, which are arranged on both the left and right sides of the central soil leveling float 16, and in the case of a 5-row rice transplanter, the seedling planting position is determined by one seedling planting rod 14 on each left and right; In the case of a 7-row rice transplanter, two seedling planting rods 14 on each side are arranged so that the seedling planting position can be leveled, and as in the case of the central soil leveling float 16, rear cases 11d and 11g are used.
Connect the rear side to case 1 via pins 17c and 17d.
1b and 11c via expansion/contraction links 18b and 18c.

Reference numeral 21 denotes a hydraulic lifting control device, which is an example of a lifting and lowering control mechanism, and includes a hydraulic pump 22, a valve 23, a hydraulic cylinder device 24 consisting of a hydraulic cylinder 24a and a hydraulic piston 24b, a hydraulic tank 25, etc. The valve 23 is interposed between the towing vehicle body 1 and the parallel link mechanism 12, and the valve 23 is connected to the central earth leveling float 16 and the protruding rod 1.
9, and when the ground pressure applied to the central earth leveling float 16 exceeds a certain level, the hydraulic cylinder 24
Switch the valve 23 so as to send oil to the base side of the oil pressure piston 24b, and conversely,
When the ground pressure falls below a certain level, the hydraulic cylinder 24a
The valve 23 is switched to retract the hydraulic piston 24b so as to send oil to the tip side of the rice transplanter 10, and the rice transplanting device 10 is always raised and lowered so that the ground pressure applied to the central soil leveling float 16 is appropriate for planting seedlings. It is configured to control.

26 is a propeller shaft that transmits power from the towing vehicle body 1 side to an intermediate transmission case 27 provided at the rear lower part of the parallel link mechanism 12.

Reference numerals 28 and 29 indicate pulleys attached to a shaft protruding from the side of the intermediate transmission case 27 and a shaft protruding from the side of the main transmission case 11a, between which the V-belt 30 is wound.

A rolling shaft 31 is provided between the intermediate transmission case 27 and the main transmission case 11a, and the main transmission case 11a is rotatably mounted around the rolling shaft 31.

In addition, in the figure, 32 is a preliminary seedling mounting stand, and 33 is a seedling bed receiving plate having a seedling dividing opening.

Next, the operation of the above example will be explained.

First, after driving the riding rice transplanter into the field, seedlings are stored and mounted in the seedling tank 13, and each rotating part is rotated by transmission while the tractor body 1 is traveling. Then, the rice transplanting device 10 slides while being supported on the soil surface by the soil leveling floats 16, 20a, and 20b at the center of the lower part and the soil leveling floats 20b at the sides, while moving from the seedling tank 13, which moves back and forth horizontally, to the seedling planting rods 14. Seedlings are divided into single seedlings and planted on the soil surface leveled by leveling floats 16, 20a, and 20b.

In this way, five or seven rows of seedlings can be planted in one run.

During the seedling planting process, when the tiller gets deeper,
The front and rear wheels 2 and 3 of the towing vehicle body 1 sink deeply from the soil surface, and therefore, a large ground pressure is applied to the center and side leveling floats 16, 20a, and 20b. The central leveling float 16 is pushed upward and the valve 23 is switched in the direction of arrow A, causing the hydraulic piston 24b to protrude and the parallel link mechanism 1
2. The rice transplanting device 10 is raised via the rolling shaft 31, and when the ground pressure becomes suitable for planting seedlings, the valve 23 is switched to neutral to stop the rice transplanting device 10 from rising.

Conversely, when the plowing platform becomes shallow, the rice transplanting device 10 tends to float above the soil surface, and the ground pressure of the central soil leveling float 16 decreases significantly. Then, the weight of the float 16 switches the valve 23 in the opposite direction of arrow A, retracts the hydraulic piston 24b, and lowers the rice transplanter 10. When the ground pressure increases to a proper state, the valve 23 is returned to neutral and the lowering starts. Stop.

In this way, the central soil leveling float 16 detects the ground pressure and issues a command to control the raising and lowering of the rice transplanting device 10. In this case, the central soil leveling float 16 is provided with a wide left and right width, and the left and right side floats are 20a and 20b, it is possible to slide by accurately following the soil surface no matter how soft the field is, and to control the raising and lowering of the rice transplanting device 10 by detecting accurate ground pressure. It can be performed.

As described above, the present invention is a rice transplanting device in which five or seven seedling planting rods 14 are arranged at predetermined intervals in the left and right directions, and seedlings are divided and planted from a seedling tank 13 that moves back and forth in the left and right directions. 10 is attached to the rear part of the towing vehicle body 1 via a lifting mechanism and a rolling mechanism,
The five or seven seedling planting rods 14 constitute the soil leveling float disposed at the bottom of the rice transplanting device 10.
Of the seedling planting positions according to Leveling float 20a,
20b is divided into three earth leveling floats, and the central earth leveling float 16 and the lifting mechanism are interlocked and connected via a control mechanism so that the ground pressure of the central earth leveling float 16 is always within a certain range. Because it is configured as a riding rice transplanter, even though it is a large riding rice transplanter that plants in odd rows, it can extremely accurately detect the ground pressure applied to the rice transplanter and accurately control the raising and lowering of the rice transplanter. Even when the soil surface of a field is soft, the central leveling float that detects ground pressure can reliably follow the soil surface and send out accurate control signals without sinking to the west of the soil. In addition, a distance can be maintained between the center leveling float and the side leveling floats to allow muddy water to flow sufficiently backward, and running resistance does not increase, allowing smooth running.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a side view, FIG. 2 is a plan view, and FIG. 3 is a hydraulic control circuit diagram. Symbols in the figure: 1 is the towing vehicle body, 10 is the rice transplanting device,
13 is a seedling tank, 14 is a seedling planting rod, 16 is a center leveling float, 20a, 20b are side leveling floats, 21 is a hydraulic lift control device, and 31 is a rolling shaft.

Claims (1)

[Claims] 1. A rice-transplanting device is installed at the rear of the towing vehicle body, in which five or seven seedling planting rods are arranged at specified intervals in the left and right directions, and the seedlings are divided and planted from a seedling tank that moves back and forth in the left and right directions. The soil leveling float is installed via a lifting mechanism and a rolling mechanism and is placed at the bottom of the rice transplanting device. The seedling planting position is leveled using a central leveling float with wide left and right widths, and three leveling floats are used to level the remaining one or two seedling planting positions on both the left and right sides using side leveling floats. A riding type rice transplanter which is provided separately, and in which the central soil leveling float and the lifting mechanism are interlocked and connected via a control mechanism so that the ground pressure of the central soil leveling float is always within a certain range.