JPH0211203B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a riding-type rice transplanter.
To propose a riding type rice transplanter in which a rice transplanter attached to the rear of a traveling vehicle body by a link is tilted forward according to the height when the rice transplanter is lifted from the ground.

(Prior art) The rice transplanting device of this invention, which tilts forward as the fish is raised higher, is disclosed in Utility Model Application No. 54-59432,
Many proposals have been made, such as in Utility Model Application Publication No. 53-112522.

(Problem to be solved by the invention) However, the conventional device uses a lift arm to lift the rice transplanting device, and also rotates a bell crank to pull the rice transplanting device around with a rod, or uses a lift cylinder to pull the rice transplanting device around. Because of the configuration in which the link is pushed around or the lower link or the upper link is expanded and contracted, the structure becomes complicated and cannot be put to practical use.

(Means for Solving the Problems) This invention focuses on the fact that as the rice transplanting device attached to the rear of the vertically parallel link changes as it rises, the angle with this link changes. By turning it to change its angle, the composition became surprisingly simple.

That is, a traveling vehicle body 1 that moves forward supported by front wheels 6, 6 and rear wheels 5, 5, a rice transplanting device 26 having a seedling stand 28 whose top is tilted forward, and a rice transplanting device 26 that protrudes rearward from the rear of the traveling vehicle body 1 and has a hydraulic Upper and lower two-stage links 16, 1 that rotate so that the rear end moves up and down with the cylinder 24a
7, the rice transplanting device 26 is attached to the rear end of the lower link 17 with a horizontal shaft 21, and a hydraulic cylinder 2
4a, when the rear ends of the upper and lower links 16, 17 rise to the predetermined positions, the links 16, 17 and the rice transplanting device 2
The riding type rice transplanter is characterized in that the rice transplanter is provided so that the top thereof can be rotated in a direction in which the top thereof is tilted forward about a horizontal axis 21 by changing the angle with respect to the rice transplanter 6.

(Function) The riding-type rice transplanter configured as described above operates when the upper and lower links 16 and 17 are transplanted in the field.
The rear end of the rice transplanter 26 is lowered downward. When pressure oil is fed into the hydraulic cylinder 24a, the rear ends of the upper and lower links 16, 17 rotate around their front ends to raise the rice transplanting device 26. At this time, since the upper link 16 and the lower link 17 are made parallel, the rice transplanting device 26 ascends in parallel without changing its angle, and as it ascends, the angle between the lower side of the lower link 17 and the rice transplanting device 26 increases. becomes smaller. When the rice transplanting device 26 rises to a predetermined height in this manner, the change in angle causes the rice transplanting device 26 to rotate around the horizontal axis 21 in a direction in which the rear end is lifted and tilted forward.

(Effects) As described above, the present invention makes use of the change in the angle with the rice transplanting device 26 as the link rises, and when the rice transplanting device 26 rises to a predetermined height, the rice transplanting device 26 is Since the device is rotated forward about the horizontal axis 21, the structure is surprisingly simple compared to conventional devices.

(Example) Next, an example of the present invention will be described. 1 is
On the traveling vehicle body, the engine stand 3 is attached to the front part of the transmission case 2, and the chain cases 4, 4 are extended obliquely downward from the left and right of the rear part of the transmission case 2, and the rear wheels 5, 5 are attached to the end of the chain cases 4, 4. Front wheels 6, 6 that can be steered are provided at the bottom of both sides of the engine stand 3.
7 is a bonnet that covers the engine mounted on the engine stand 3. Reference numeral 8 denotes a sheet, which is provided at the top of a frame 9 that connects the chain cases 4, 4 and is gate-shaped in rear view. 10 is the handle, 1
1 indicates a change lever, and 12 indicates a brake pedal. Reference numeral 13 denotes a preliminary seedling mounting stand, which is provided so as to protrude outward on both the left and right sides of the sheet 8, and is designed to place seedlings with soil grown in the seedling raising box together with the box.

Reference numerals 14, 14 are pillars whose bases are fixed to a connecting pipe 15 that connects the left and right chain cases 4, 4, protrude upward, and are located inside the gate-shaped frame 19.

Reference numeral 16 denotes an upper link, which is one piece and is placed inside the pillars 14, 14, and its front part is attached to a pin 18 provided between the pillars 14, 14, and its rear part rotates up and down. I'm starting to do that. Further, the lower links 17 are provided in a pair on the left and right, and the front portions are provided with protruding pins 19, 1 provided on the outside of the pillars 14, 14.
It is made so that it rotates around 9 and the rear part moves up and down.

20 is a connecting frame, left and right lower links 17, 17
The lower part is fixed to a horizontal shaft 21 rotatably provided at the rear end, and the upper part is provided with an arc-shaped elongated hole 23, into which the pin 22 at the rear end of the upper link 16 is inserted. It is made so that it can be rotated around the horizontal axis 21 mentioned above. In addition, in this invention, this connection frame 20 also forms a part of the rice transplanting apparatus mentioned later.

24 is an upper and lower actuating device, which is a hydraulic cylinder 2;
The base of the hydraulic piston 4a is pivoted to the transmission case 2, and the tip of a hydraulic piston 24b that protrudes from this is pivoted to the arm 25 that has descended from the upper link 16, and the protrusion of the piston 24b causes the rear end of the upper link 16 to move upward. It is designed to rotate.

26 is a rice transplanting device, and the main transmission case 2
7, a seedling stand 28 whose top is tilted forward is attached so as to reciprocate from side to side, and a planting tool 29 for dividing and planting seedlings one by one from the seedling stand 28 is attached to the rear end. Further, a central soil leveling float 30a is installed below it, and a pair of left and right soil leveling floats 30b, 30b are attached to the sides thereof to level the soil surface.

Reference numeral 31 denotes a switching valve, which is installed in front of the transmission case 27, and whose switching spool is connected to the earth leveling float 30a.
When the tip moves upward, the spool is pushed up and the piston 24b protrudes, and when it moves downward, the piston 2
4b is configured to retract. Further, a lever 32 is provided on the side of the seat 8, and a wire 33
so that the front part of the earth leveling float 30a can be lifted up.

34 is a rolling shaft that projects forward from the rice transplanting device 26, is inserted into the rear end of a cylindrical body 35 fixed to the horizontal shaft 21 that is integrated with the connecting frame 20, and is stopped by a retaining pin 36 so that it does not come out. There is.

Reference numeral 37 denotes a rotation device of the rice transplanting device, which includes a U-shaped arm 37a that is integrally fixed to the connection frame 20 and projects forward, and a connection rod 37b that connects the left and right lower links 17, 17. configured, link above 1
When the rear part of the hydraulic piston 24b rotates upward, the arm 37a abuts the connecting rod 37b, forcing the connecting frame 20 to rotate forward (in the direction of arrow A).

Note that 38 is a power transmission shaft that is configured to transmit power to the rice transplanting device 26.

Next, the effect will be explained. Spare seedling stand 13
Place the spare seedlings on the seedling stand 28 of the rice transplanting device 26.
When the soiled seedlings taken out from the seedling raising box are placed on the ground and the soil leveling float 30a is released from the lifted state using the operation lever 32, the spool of the switching valve 31 is switched and the oil in the hydraulic cylinder 24a returns to the oil tank. The piston 24b is pushed into the cylinder 24a by the load of the rice transplanting device 26, and the rice transplanting device 26
descends. And the leveling floats 30a, 30
b touches the soil surface of the field, at this time the spool is pushed up, the switching valve 31 is switched to the neutral state and stabilized.

In this state, the traveling vehicle body 1 is moved forward, and each rotating part on the rice transplanting device 26 side is driven by the transmission shaft 38.

Then, the seedling platform 28 reciprocates from side to side, and a planting tool 29 divides the seedlings one by one from the lower end side of the seedling platform 28 and plants them onto the soil leveled by the soil leveling floats 30a, 30a.

During such work, even if the towing vehicle body 1 tilts to the left or right, the rice transplanting device 26 remains horizontal by rotating around the rolling shaft 34, and even if the traveling vehicle body 1 tilts forward or backward to some extent, the connecting frame 20 can rotate within a certain range around the pin 21, so the soil leveling float 3 always floats above the soil surface without tilting forward or backward.
The seedlings are towed while being supported by 0a and 31b, and the planting depth of the seedlings is maintained constant.

Further, when there is a large fluctuation in the tiller and the traveling vehicle body 1 moves up and down, the soil leveling float 30a is pushed up or becomes suspended in the air, and the switching valve 31 is automatically switched and the actuating device (hydraulic cylinder The rice transplanting device 26 is automatically controlled up and down by the rice planting device 26 to maintain the proper seedling planting state at all times.

In this way, during the seedling planting work, the number of seedlings in the seedling platform 28 decreases, and it becomes necessary to replenish the seedlings in the preliminary seedling platform 13 to the seedling platform 28. After stopping the propulsion of the vehicle body 1 and the power transmission on the rice transplanting device 26 side, pull up the tip of the soil leveling float 30a with the operating lever 32 and close the hydraulic switching valve 3.
1, the hydraulic piston 24b is made to protrude, and the rear part of the upper link 16 is raised. Then, the connecting frame 20
Since the load of the rice transplanting device 26 is applied to
As shown in FIG. 3, when the upper link 16 gradually rotates upward and reaches a certain height, the U-shaped arm 37a hits the connecting rod 37b. Gradually, the U-shaped arm a is pushed downward, which causes the connecting frame 20 to rotate forward, causing the entire rice transplanting device 26 to tilt forward around the horizontal axis 21, as shown in FIG. Push around.

Therefore, as the seedling platform 28 approaches the seat 8 side, its angle of inclination becomes gentler, allowing the operator to easily supply spare seedlings to the seedling platform 28.

Next, when the seedlings have been supplied to the seedling platform 28, the soil leveling float 30a is lowered using the operating lever 32, the switching valve 31 is switched, the piston 24b is retracted, and the rice transplanting device 26 is lowered. In this case, the connecting frame 20 slowly rotates backward and returns to its original position, and when the soil leveling floats 30a and 30b touch the soil surface, the hydraulic valve 31 returns to the neutral state, and in this state, the rice transplanting operation can be resumed. Begins.

[Brief explanation of drawings]

Figure 1 is a side view of a riding rice transplanter to which the present invention has been applied, Figure 2 is its plan view, Figure 3 is a partial slope view, Figure 4 is its back sectional view, and Figure 5 is its operation. It is a side view of a part which shows a state. The symbols in the figure are as follows. 1... Running vehicle body,
5...Rear wheel, 6...Front wheel, 16...Top link, 1
7...Lower link, 21...Horizontal axis, 24a...Hydraulic cylinder, 26...Rice transplanting device, 28...Seedling stand,
37a...Arm.

Claims (1)

[Claims] 1. A traveling vehicle body 1 that moves forward supported by front wheels 6, 6 and rear wheels 5, 5, a rice transplanting device 26 having a seedling stand 28 whose top is tilted forward, and a hydraulic cylinder protruding rearward from the rear of the traveling vehicle body 1. The rice transplanting device 26 is equipped with upper and lower links 16 and 17 whose rear ends rotate up and down at 24a, and a horizontal shaft 2 at the rear end of the lower link 17.
1, and when the rear ends of the upper and lower links 16, 17 are raised to a predetermined position by the hydraulic cylinder 24a, the upper part tilts forward around the horizontal axis 21 due to the change in the angle between the links 16, 17 and the rice transplanting device 26. A riding-type rice transplanter characterized by being provided so as to rotate in a direction.